Stroller frame and unlocking mechanism thereof

Abstract

A stroller frame and an unlocking mechanism thereof. The unlocking mechanism (100X) comprises a first unlocking member (110X), which is rotatably arranged on a stroller frame (1000X), wherein the first unlocking member (110X) is drivingly connected to a folding locking mechanism (500X), so as to allow a lower handle frame (220X) to pivot relative to a wheel frame (300X); a second unlocking member (120X), which is rotatably arranged on the stroller frame (1000X), wherein the second unlocking member (120X) is drivingly connected to a height adjustment locking mechanism (400X), so as to allow an upper handle frame (210X) to move relative to the lower handle frame (220X); and an operating member (130X), which is movably arranged on the stroller frame (1000X) and adapted to drive any one of the first unlocking member (110X) and the second unlocking member (120X) to rotate. Therefore, a user can control the first unlocking member to rotate by driving the operating member, thereby indirectly controlling the folding locking mechanism. Moreover, the user can further control the second unlocking member to rotate by driving the operating member, thereby indirectly controlling the height adjustment locking mechanism. The user can respectively control different locking mechanisms by simply operating the unlocking mechanism, thereby improving the operation convenience of the user.

Description

Cart frame and its release mechanism

[0001] Related applications

[0002] This application claims priority to Chinese patent applications filed on January 17, 2025, with application number 2025100833121, entitled “Cart frame and its unlocking mechanism”; filed on January 24, 2024, with application number 202410103141X, entitled “Cart frame and its unlocking mechanism”; and filed on September 9, 2024, with application number 2024112593707, entitled “Cart frame and its unlocking mechanism”; and filed on October 22, 2024, with application number 2024114795281, entitled “Cart frame and its unlocking mechanism”, the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the technical field of baby products, and in particular to a stroller frame and a locking release mechanism thereof. Background Art

[0004] For families with infants and young children, using strollers as auxiliary care tools when going out has become very common and convenient.

[0005] To meet users' demands for practicality and convenience in strollers, a folding and locking mechanism is typically installed on the stroller's frame, allowing users to maintain the stroller in either the expanded or folded state. Furthermore, to improve the stroller's usability, the handlebars are also equipped with a height adjustment and locking mechanism, allowing users to adjust the height of the handlebars to suit different user grip requirements. Currently, the folding and locking mechanisms and height adjustment mechanisms of common strollers are separate mechanisms, requiring adjustment of the frame's position or handlebar height to be achieved through two independent operating mechanisms. However, such a design can easily lead to inconvenience in user operation. Summary of the Invention

[0006] Based on this, it is necessary to provide a stroller frame and a release mechanism thereof to address the above-mentioned problem, wherein the release mechanism can release the folding locking mechanism and the height adjustment locking mechanism respectively.

[0007] The present invention provides a release mechanism applicable to a stroller frame, wherein the stroller frame includes an upper hand frame, a lower hand frame, a wheel frame, a height adjustment locking mechanism and a folding locking mechanism, wherein the upper hand frame and the lower hand frame are restricted or allowed to move relative to each other by the height adjustment locking mechanism, and the lower hand frame is pivotally connected to the wheel frame and restricted or allowed to pivot relative to each other by the folding locking mechanism, wherein the release mechanism includes: a first release member rotatably arranged on the stroller frame, the first release member being driven connected to the folding locking mechanism to allow the lower hand frame to pivot relative to the wheel frame; a second release member rotatably arranged on the stroller frame, the second release member being driven connected to the height adjustment locking mechanism to allow the upper hand frame to move relative to the lower hand frame; and an operating member movably arranged on the stroller frame and adapted to drive any one of the first release member and the second release member to rotate.

[0008] In the aforementioned release mechanism, a first release member is rotatably mounted on the stroller frame and drivingly connected to the folding lock mechanism, a second release member is rotatably mounted on the stroller frame and drivingly connected to the height adjustment lock mechanism, and an operating member is movable and configured to drive either the first or second release member to rotate. The folding lock mechanism allows the lower handlebar frame to pivot relative to the wheel frame, while the height adjustment lock mechanism allows the upper handlebar frame to slide relative to the lower handlebar frame. Therefore, a user can control the rotation of the first release member by driving the operating member, thereby indirectly controlling the folding lock mechanism to switch the stroller frame between an extended and locked state. Simultaneously, the user can also control the rotation of the second release member by driving the operating member, thereby indirectly controlling the height adjustment lock mechanism to adjust the height of the stroller frame. Because a user can control each locking mechanism separately by simply operating the release mechanism, user convenience is improved.

[0009] In one embodiment, the release mechanism also includes a safety lock, which is movably arranged on the cart frame and can be switched between a first position and a second position; when the safety lock is in the first position, the operating member is driven and connected to the first release member through the safety lock; when the safety lock is in the second position, the operating member is driven and connected to the second release member through the safety lock.

[0010] In one embodiment, the safety lock includes: a toggle member, movably provided on the cart frame along a first direction and switchable between the first position and the second position; a first linking member, movably connected to the toggle member along a second direction, and drivingly connected to the first release member; and a second linking member, movably connected to the toggle member along a second direction, and drivingly connected to the second release member; wherein the first direction intersects with the second direction, and the operating member is movable in the second direction relative to the cart frame; when the toggle member is in the first position, the operating member can be operated to push the first linking member to move and rotate the first release member; when the toggle member is in the second position, the operating member can be operated to push the second linking member to move and rotate the second release member.

[0011] In one embodiment, the first linking member has a first abutting portion, the second linking member has a second abutting portion, and the operating member has a first driving portion and a second driving portion that are spaced apart; when the toggle member is located at the first position, the first abutting portion is located opposite the first driving portion, and the second abutting portion is offset from the second driving portion; when the toggle member is located at the second position, the second abutting portion is located opposite the second driving portion, and the first abutting portion is offset from the first driving portion.

[0012] In one embodiment, the operating member further has a third driving portion and a fourth driving portion, the third driving portion and the fourth driving portion are spaced apart and located between the first driving portion and the second driving portion; the first linking member and the second linking member are spaced apart and a third avoidance portion is formed therebetween, the first linking member further has a third abutment portion, and the second linking member further has a fourth abutment portion; when the toggle member is located at the first position, the third abutment portion is located opposite to the third driving portion, and the fourth driving portion is located opposite to the third avoidance portion; when the toggle member is located at the second position, the fourth abutment portion is located opposite to the fourth driving portion, and the third driving portion is located opposite to the third avoidance portion.

[0013] In one embodiment, a first avoidance portion is formed between the first abutting portion and the third abutting portion; a second avoidance portion is formed between the second abutting portion and the fourth abutting portion; when the toggle member is located at the first position and the operating member is operated, the second avoidance portion is used to avoid the second driving portion; when the toggle member is located at the second position and the operating member is operated, the first avoidance portion is used to avoid the first driving portion.

[0014] In one embodiment, one of the first linking member and the first releasing member has a first guide recess, and the other has a first mating protrusion, the first mating protrusion can be slidably disposed in the first guide recess, and the first guide recess extends along the first direction; one of the second linking member and the second releasing member has a second guide recess, and the other has a second mating protrusion, the second mating protrusion can be slidably disposed in the second guide recess, and the second guide recess extends along the first direction.

[0015] In one embodiment, the release mechanism further includes a first elastic member, which abuts between the cart frame and the toggle member and is used to provide an elastic restoring force for the toggle member to keep the toggle member in the first position or the second position.

[0016] In one embodiment, the operating member has an initial position and a release position; when the operating member is located at the initial position, the operating member can be operated to move to push the first linking member or the second linking member to move; when the operating member is located at the release position, the operating member pushes the first linking member or the second linking member.

[0017] In one embodiment, the release mechanism further includes a second elastic member, which abuts between the cart frame and the operating member and is used to provide an elastic restoring force for the operating member to keep the operating member in the initial position.

[0018] In one embodiment, the operating member has an initial position and a release position; one of the first release member and the cart frame is provided with a first stop recess, and the other is provided with a first stop protrusion, the first stop protrusion abuts against a side wall of the first stop recess when the operating member is switched to the initial position, and the first stop protrusion abuts against the other side wall corresponding to the first stop recess when the operating member is switched to the release position; one of the second release member and the cart frame is provided with a second stop recess, and the other is provided with a second stop protrusion, the second stop protrusion abuts against a side wall of the second stop recess when the operating member is switched to the initial position, and the second stop protrusion abuts against the other side wall corresponding to the second stop recess when the operating member is switched to the release position.

[0019] In one embodiment, a first connecting portion is provided on the first release member, the first connecting portion is offset from the rotation center of the first release member, and the first connecting portion is used to connect the folding locking mechanism; a second connecting portion is provided on the second release member, the second connecting portion is offset from the rotation center of the second release member, and the second connecting portion is used to connect the height adjustment locking mechanism.

[0020] The present invention also provides a cart frame, comprising an upper hand frame, a lower hand frame, a wheel frame, a folding and locking mechanism, a height adjustment locking mechanism and the release mechanism as described above, wherein the upper hand frame and the lower hand frame are restricted or allowed to move relative to each other by the height adjustment locking mechanism, the lower hand frame is pivotally connected to the wheel frame and is restricted or allowed to pivot relative to each other by the folding and locking mechanism, and the release mechanism is arranged on the hand frame or the wheel frame and is respectively driven and connected to the folding and locking mechanism and the height adjustment locking mechanism to allow the lower hand frame to pivot relative to the wheel frame and the upper hand frame to move relative to the lower hand frame.

[0021] In one embodiment, the folding and locking mechanism includes a first locking member and a fixing member, the fixing member is provided with a locking recess and is installed in one of the wheel frame or the lower handrail, the first locking member is movably provided in the other of the wheel frame or the lower handrail and is operably connected to the first releasing member; when the first locking member is inserted into the locking recess, the lower handrail is restricted from pivoting relative to the wheel frame, and when the first locking member is withdrawn from the locking recess, the lower handrail can pivot relative to the wheel frame.

[0022] In one embodiment, the folding and locking mechanism further includes a first pulling member connected between the first releasing member and the first locking member, and the first releasing member drives the first locking member to retract from the locking recess through the first pulling member.

[0023] In one embodiment, the height adjustment locking mechanism includes a rider locking assembly and a locking hole, one of the upper rider frame and the lower rider frame is provided with a locking hole, and the other is provided with a rider locking assembly, and the rider locking assembly can be engaged with the locking hole to lock the upper rider frame and the lower rider frame.

[0024] In one embodiment, the rider locking assembly is arranged on the upper rider frame, and the rider locking assembly includes: a moving member, which is movably arranged on the upper rider frame and is operably connected to the second release member, the moving member is provided with a guide groove, and the guide groove extends obliquely relative to the moving direction of the moving member; and a second locking member, which has a guide column, the guide column extends into the guide groove and slidably cooperates with the guide groove so as to be able to extend into or withdraw from the locking hole.

[0025] In one embodiment, the height adjustment locking mechanism further includes a second traction member, which is connected between the second release member and the movable member. The second release member drives the movable member to move through the second traction member to drive the second locking member to withdraw from the locking hole.

[0026] In one embodiment, a plurality of locking holes are provided, and the plurality of locking holes are spaced apart along the sliding direction of the upper handrail relative to the lower handrail.

[0027] The present application provides a release mechanism applicable to a stroller frame, the stroller frame comprising a handle frame, a wheel frame, a reversing locking mechanism and a folding locking mechanism, the handle frame being rotatably arranged on the wheel frame, the reversing locking mechanism and the folding locking mechanism being both arranged between the handle frame and the wheel frame, the handle frame being able to limit or allow it to rotate relative to the wheel frame for reversing by means of the reversing locking mechanism, and the handle frame being able to limit or allow it to rotate relative to the wheel frame for folding by means of the folding locking mechanism, the release mechanism comprising: a first release member rotatably arranged on the stroller frame and drivingly connected to the reversing locking mechanism to allow the handle frame to rotate relative to the wheel frame for reversing; a second release member rotatably arranged on the stroller frame and drivingly connected to the folding locking mechanism to allow the handle frame to rotate relative to the wheel frame for folding; and an operating member movably arranged on the stroller frame and selectively driving the first release member or the second release member to rotate.

[0028] In one embodiment, the release mechanism also includes a safety lock, which is movably arranged on the cart frame and can be switched between a first position and a second position; when the safety lock is in the first position, the operating member is driven and connected to the first release member through the safety lock; when the safety lock is in the second position, the operating member is driven and connected to the second release member through the safety lock.

[0029] In one embodiment, the safety lock includes: a first link, which is driven and connected to the first release member; a second link, which is driven and connected to the second release member; and a toggle member, which is respectively connected to the first link and the second link, and the toggle member is movably provided on the cart frame and can be switched between the first position and the second position to drive the first link and the second link to move along a third direction; wherein, when the toggle member is located at the first position, the operating member is operated to push the first link to move along a fourth direction to rotate the first release member; when the toggle member is located at the second position, the operating member is operated to push the second link to move along a fourth direction to rotate the second release member, and the third direction intersects with the fourth direction.

[0030] In one embodiment, a first connecting portion is provided on the first release member, the first connecting portion is offset from the rotation center of the first release member, and the first connecting portion is used to connect to the reversing locking mechanism; a second connecting portion is provided on the second release member, the second connecting portion is offset from the rotation center of the second release member, and the second connecting portion is used to connect to the retracting locking mechanism.

[0031] The present application also provides a cart frame having an expanded state and a folded state, comprising: a wheel frame; a rider frame rotatably arranged on the wheel frame; a reversing locking mechanism arranged between the rider frame and the wheel frame, the rider frame being able to limit or allow its rotation relative to the wheel frame for reversing by means of the reversing locking mechanism; a folding locking mechanism arranged between the rider frame and the wheel frame, the rider frame being able to limit or allow its rotation relative to the wheel frame for folding by means of the folding locking mechanism; and the release mechanism as described above, arranged on the rider frame and drivingly connected to the folding locking mechanism and the release mechanism respectively, to allow the rider frame to rotate relative to the wheel frame for reversing or folding.

[0032] In one embodiment, the rider frame is pivotally connected to the wheel frame at a first pivot point so that the rider frame has a first use position and a second use position relative to the wheel frame; the reversing locking mechanism includes a first locking member, a first engaging member and a second engaging member, the first engaging member and the second engaging member are arranged on the wheel frame at circumferential intervals around the first pivot point, the first locking member is arranged on the rider frame and is suitable for engaging with the first engaging member or the second engaging member; when the first locking member is engaged with the first engaging member, the rider frame is in the first use position, and when the first locking member is engaged with the second engaging member, the rider frame is in the second use position.

[0033] In one embodiment, when the rider frame is in the first use position, the top of the rider frame is located on a first side of the wheel frame; when the rider frame is in the second use position, the top of the rider frame is located on a second side of the wheel frame; wherein the first side and the second side are arranged opposite to each other with respect to the travel direction of the cart frame.

[0034] In one embodiment, the first locking member has a locking portion, and the first engaging member and the second engaging member are both provided with a matching locking portion adapted to engage with the locking portion; the first locking member is movably provided on the hand frame and has a first locking position and a first unlocking position, when in the first locking position, the locking portion is engaged with the matching locking portion to restrict the hand frame from switching between the first use position and the second use position; when in the first unlocking position, the locking portion is disengaged from the matching locking portion to allow the hand frame to switch between the first use position and the second use position.

[0035] In one embodiment, the reversing locking mechanism further includes: a first driving member movably provided on the handlebar frame and connected to the first locking member; and a first traction member respectively connected to the first driving member and the first releasing member; when the first releasing member rotates, the first releasing member drives the first driving member to move via the first traction member, thereby driving the first locking member to move from the first locking position to the first releasing position.

[0036] In one embodiment, the hand frame and the wheel frame are pivotally connected at a first pivot point, so that the hand frame has a first use position and a third use position relative to the wheel frame; when the hand frame is in the first use position, the hand frame and the wheel frame are separated from each other around the first pivot point, so that the cart frame is in the expanded state; when the hand frame is in the third use position, the hand frame and the wheel frame are moved closer to each other around the first pivot point, so that the cart frame is in the folded state.

[0037] In one embodiment, the folding locking mechanism includes: a second locking member that is movable relative to the handlebar frame and has a second locking position and a second releasing position; the wheel frame includes a rear wheel frame and a first transmission member, one end of the first transmission member is pivotally connected to the rear wheel frame, and the other end is pivotally connected to the handlebar frame at the first pivot point; when the second locking member is in the second locking position, the second locking member engages with the first transmission member to limit the pivoting of the handlebar frame relative to the first transmission member, thereby limiting the switching of the handlebar frame between the first use position and the third use position; when the second locking member is in the second releasing position, the second locking member disengages from the first transmission member to allow the handlebar frame to pivot relative to the first transmission member, thereby allowing the handlebar frame to switch between the first use position and the third use position.

[0038] In one embodiment, the first transmission member has a first recess and a second recess, and when the cart frame is in the expanded state, the second locking member engages with the first recess; when the cart frame is in the folded state, the second locking member engages with the second recess.

[0039] In one embodiment, the folding and locking mechanism further includes: a second driving assembly movably provided on the handlebar frame and drivingly engaged with the second locking member; and a second traction member connected to the second driving assembly and the second releasing member, respectively; when the second releasing member rotates, the second releasing member drives the second driving assembly to move via the second traction member, thereby driving the second locking member to move from the second locking position to the second releasing position.

[0040] The present application provides a release mechanism, applicable to a stroller frame, the stroller frame comprising a hand frame, a wheel frame, a wheel seat and a wheel locking mechanism, the hand frame comprising an upper hand frame, a lower hand frame and a height adjustment locking mechanism arranged therebetween, the upper hand frame and the lower hand frame being restricted or allowed to move relative to each other by the height adjustment locking mechanism; the wheel seat being rotatably connected to the wheel frame, the wheel locking mechanism being arranged between the wheel frame and the wheel seat and being used to restrict or allow the wheel seat to rotate relative to the wheel frame, the release mechanism comprising: a first release member rotatably arranged on the stroller frame and drivingly connected to the wheel locking mechanism to allow the wheel seat to rotate relative to the wheel frame; a second release member rotatably arranged on the stroller frame and drivingly connected to the height adjustment locking mechanism to allow the upper hand frame to move relative to the lower hand frame; and an operating member movably arranged on the stroller frame and selectively driving the first release member or the second release member to rotate.

[0041] In one embodiment, a first connecting portion is provided on the first release member, the first connecting portion is offset from the rotation center of the first release member, and the first connecting portion is used to connect to the wheel locking mechanism; a second connecting portion is provided on the second release member, the second connecting portion is offset from the rotation center of the second release member, and the second connecting portion is used to connect to the height adjustment locking mechanism.

[0042] The present application also provides a cart frame, comprising: a hand frame, a wheel frame, a wheel seat, a wheel locking mechanism and the release mechanism as described above, wherein the hand frame comprises an upper hand frame, a lower hand frame and a height adjustment locking mechanism arranged therebetween, wherein the upper hand frame and the lower hand frame are restricted or allowed to move relative to each other through the height adjustment locking mechanism; the wheel seat is rotatably connected to the wheel frame, the wheel locking mechanism is arranged between the wheel frame and the wheel seat, and is used to restrict or allow the wheel seat to rotate relative to the wheel frame, and the release mechanism is arranged on the hand frame and is respectively driven and connected to the wheel locking mechanism and the height adjustment mechanism to allow the wheel seat to rotate relative to the wheel frame and the upper hand frame to move relative to the lower hand frame.

[0043] In one embodiment, the wheel locking mechanism includes: a first locking recess provided in the wheel seat; a first locking member movably provided in the wheel frame and adapted to lock and cooperate with the first locking recess; and a first traction member connected between the first release member and the first locking member; when the first locking member extends into the first locking recess for locking cooperation, the wheel seat is restricted from rotating relative to the wheel frame, and when the first release member drives the first locking member to withdraw from the first locking recess through the first traction member to release the cooperation, the wheel seat is allowed to rotate relative to the wheel frame.

[0044] In one embodiment, the first traction member is disposed in the rider frame and the wheel frame and passes through the height adjustment locking mechanism.

[0045] In one embodiment, the height adjustment locking mechanism includes a support seat, the support seat is provided with a first through-channel, and the first through-channel is a U-shaped channel, and the end of the first traction member away from the first release member extends from one end of the U-shaped channel and extends from the other end of the U-shaped channel, so that the first traction member is arranged around the support seat.

[0046] In one embodiment, the upper handrail can slide relative to the lower handrail, and the height adjustment locking mechanism includes: a second locking portion, which is provided on the lower handrail; a second locking assembly, which is movably provided on the upper handrail and is suitable for locking and cooperating with the second locking portion; and a second traction member, which is connected between the second release member and the second locking assembly; when the second locking assembly extends into the second locking portion to lock and cooperate, the upper handrail is restricted from sliding relative to the lower handrail; when the second release member drives the second locking assembly to retreat from the second locking portion to release the cooperation through the second traction member, the upper handrail is allowed to slide relative to the lower handrail.

[0047] In one embodiment, the height adjustment locking mechanism also includes a support seat, the support seat is provided with a first through-channel and a second through-channel, the first through-channel is a U-shaped channel, the second through-channel is a straight channel, and the second traction member is accommodated in the straight channel; the wheel locking mechanism includes a first traction member, the first traction member is arranged in the wheel frame and the driver frame and passes through the U-shaped channel.

[0048] In one embodiment, the height adjustment locking mechanism includes: a first connecting seat connected to the upper handrail; a second connecting seat connected to the lower handrail and pivotally connected to the first connecting seat; and a second locking member axially movably disposed between the first connecting seat and the second connecting seat to limit or allow relative pivoting of the two.

[0049] In one embodiment, the height adjustment locking mechanism further includes: a driving member, movably arranged on a side of the first connecting seat facing away from the second connecting seat or a side of the second connecting seat facing away from the first connecting seat, the driving member axially passes through the first connecting seat or the second connecting seat and abuts against the second locking member to drive the second locking member to move; and a second traction member, connecting the driving member and the second release member, when the second release member is operated, the second traction member drives the second locking member to move through the driving member to allow the first connecting seat to pivot relative to the second connecting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only for illustrative purposes and are not necessarily drawn to true scale.

[0053] FIG1 schematically shows a perspective view of a cart frame in one embodiment of the present application;

[0054] FIG2 schematically shows a perspective view of a cart frame from another perspective in one embodiment of the present application;

[0055] FIG3 is a cross-sectional view along line U1-U1 in FIG1 , wherein the first locking member is inserted into the locking recess;

[0056] FIG4 is a cross-sectional view along line U1-U1 in FIG1 , wherein the first locking member is retracted from the locking recess;

[0057] FIG5 is a perspective view of the handlebar frame of the cart frame shown in FIG1 ;

[0058] FIG6 is a perspective view of the handlebar frame of the stroller frame shown in FIG1 from another perspective;

[0059] FIG7 is a perspective view of the upper handlebar frame of the handlebar frame shown in FIG5 , wherein the movable member and the second locking member of the height adjustment locking mechanism are assembled;

[0060] FIG8 is a perspective view of the upper handlebar frame of the handlebar frame shown in FIG5 , wherein the movable member and the second locking member of the height adjustment locking mechanism are separated;

[0061] FIG9 is an enlarged schematic diagram of the structure at circle A in FIG2 ;

[0062] FIG10 is an exploded view of the release mechanism on the driver's frame shown in FIG5 ;

[0063] FIG11 is an enlarged schematic diagram of the structure at circle B in FIG10 ;

[0064] FIG12 is a schematic diagram of a partial structure of the release mechanism, wherein the toggle member is in the first position and the operating member is in the initial position;

[0065] FIG13 is a schematic diagram of a partial structure of the release mechanism, wherein the toggle member is in the first position and the operating member is in the release position;

[0066] FIG14 is a schematic diagram of a partial structure of the release mechanism, wherein the toggle member is in the second position and the operating member is in the initial position;

[0067] FIG15 is a schematic diagram of a partial structure of the release mechanism, wherein the toggle member is in the second position and the operating member is in the release position;

[0068] FIG16 is a perspective view of a stroller frame in an expanded state according to an embodiment of the present application, wherein the second locking member is in a second locking position;

[0069] FIG17 is a perspective view of a stroller frame in an expanded state according to an embodiment of the present application, wherein the second locking member is in a second unlocking position;

[0070] FIG18 is a side view of the cart frame shown in FIG16;

[0071] FIG19 is an enlarged schematic diagram of the structure at circle A shown in FIG16 ;

[0072] FIG20 is an enlarged schematic diagram of the structure at circle B shown in FIG17;

[0073] FIG21 is a cross-sectional view of the handlebar frame of the stroller frame shown in FIG16 , wherein the operating member is in the initial position;

[0074] FIG22 is a cross-sectional view of the handlebar frame of the stroller frame shown in FIG16 , wherein the operating member is in the unlocked position and the first release member is rotated;

[0075] FIG23 is a perspective view of a stroller frame in a folded state according to an embodiment of the present application;

[0076] FIG24 is a side view of a cart frame in a folded state according to an embodiment of the present application;

[0077] FIG25 is a cross-sectional view along line U1-U1 in FIG18;

[0078] FIG26 is an enlarged schematic diagram of the structure at circle C shown in FIG23;

[0079] FIG27 is an enlarged schematic diagram of the structure at circle D shown in FIG21;

[0080] FIG28 is a cross-sectional view of the handlebar frame of the stroller frame shown in FIG16 , wherein the operating member is in the unlocked position and the second release member is rotated;

[0081] FIG29 is a perspective view of the release mechanism in the stroller frame shown in FIG16;

[0082] FIG30 is a schematic diagram of a portion of the structure of the release mechanism shown in FIG29;

[0083] FIG31 is an exploded view of the release mechanism shown in FIG29;

[0084] FIG32 is a cross-sectional view of the release mechanism shown in FIG30;

[0085] FIG33 is a perspective view of the cart frame in the first embodiment of the present application in an unfolded state;

[0086] FIG34 is a cross-sectional view of the cart frame shown in FIG33;

[0087] FIG35 is a perspective view of the stroller frame shown in FIG33 in a folded state;

[0088] FIG36 is a cross-sectional view of the cart frame shown in FIG34;

[0089] FIG37 is a cross-sectional view of the handlebar frame of the stroller frame shown in FIG33 ;

[0090] FIG38 is a perspective view of the release mechanism in the stroller frame shown in FIG33;

[0091] FIG39 is a schematic diagram of a portion of the structure of the release mechanism shown in FIG38;

[0092] FIG40 is an exploded view of the release mechanism shown in FIG38;

[0093] FIG41 is a cross-sectional view of the release mechanism shown in FIG37 , wherein the first release member is rotated;

[0094] FIG42 is a cross-sectional view of the release mechanism shown in FIG37 , wherein the second release member is rotated;

[0095] FIG43 is a cross-sectional view of the release mechanism shown in FIG39;

[0096] FIG44 is a perspective view of a rider frame according to another embodiment;

[0097] FIG45 is a perspective view of a handlebar frame in a stroller frame according to a second embodiment of the present application;

[0098] FIG46 is a side view of the rider frame shown in FIG45;

[0099] FIG47 is an exploded view of the structure of the driver's frame shown in FIG45;

[0100] FIG48 is a cross-sectional view of the handlebar frame shown in FIG45 , wherein the second locking member is in a locked position;

[0101] FIG49 is a cross-sectional view of a partial structure of the handlebar frame shown in FIG45 , wherein the second locking member is in a released position;

[0102] Figure 50 is a cross-sectional view of a partial structure of a driver's frame in another embodiment.

[0103] DESCRIPTION OF NUMERALS 1000X, cart frame; 100X, release mechanism; 110X, first release member; 111X, first connecting portion; 112X, first stop protrusion; 120X, second release member; 121X, second connecting portion; 122X, second stop protrusion; 130X, operating member; 131X, first driving portion; 132X, second driving portion; 133X, third driving portion; 134X, fourth driving portion; 135X, limiting post; 140X, safety lock; 141X, dial Moving member; 1411X, pushing portion; 142X, first linking member; 1421X, first abutting portion; 1422X, third abutting portion; 1423X, first avoidance portion; 143X, second linking member; 1431X, second abutting portion; 1432X, fourth abutting portion; 1433X, second avoidance portion; 144X, third avoidance portion; 150X, first elastic member; 160X, second elastic member; 171X, first fixing cover; 171X1, operating hole; 172X, second fixing cover; 2 00X, handrail; 210X, upper handrail; 211X, first support tube; 212X, push handle tube; 2121X, first stop recess; 2122X, second stop recess; 220X, lower handrail; 221X, second support tube; 300X, wheel frame; 310X, front wheel frame; 311X, front rod; 312X, front crossbar; 313X, front wheel seat; 320X, rear wheel frame; 321X, rear rod; 322X, reinforcement rod; 323X, rear wheel seat; 400X, height adjustment The entire locking mechanism; 410X, the driver locking assembly; 411X, the moving part; 4111X, the guide groove; 412X, the second locking part; 413X, the support seat; 414X, the fourth elastic part; 420X, the locking hole; 430X, the second traction member; 500X, the folding locking mechanism; 510X, the first locking part; 520X, the fixing part; 521X, the locking recess; 530X, the first traction member; 610X, the front wheel; 620X, the rear wheel; F1, the first direction; F2, the second direction; 1000Y, the cart frame; 100Y, the driver frame; 110Y, the support tube; 120Y, the push handle tube; 130Y, the fixed support seat; 140Y, Mounting seat; 200Y, wheel frame; 210Y, front wheel frame; 220Y, rear wheel frame; 230Y, first transmission member; 240Y, armrest member; 250Y, second transmission member; 260Y, third transmission member; 270Y, wheel; 300Y, reversing locking mechanism; 310Y, first locking member; 311Y, locking portion; 320Y, first engaging member; 330Y, second engaging member; 301Y, matching locking portion; 340Y, first driving member; 350Y, first traction member; 360Y, first connecting member; 370Y, first resetting member; 400Y, folding locking mechanism; 410Y, second locking member; 420Y, second driving assembly; 421Y, second sliding sleeve; 422Y, second driving member;430Y, second traction member; 440Y, second reset member; 450Y, second connecting member; 500Y, release mechanism; 510Y, first release member; 511Y, first connecting portion; 520Y, second release member; 521Y, second connecting portion; 530Y, operating member; 531Y, first driving portion; 532Y, second driving portion; 533Y, third driving portion; 534Y, fourth driving portion; 540Y, safety lock; 541Y, first linking member; 5411Y, first contact portion; 5412Y, third contact portion; 54 2Y, second link; 5421Y, second abutting portion; 5422Y, fourth abutting portion; 543Y, toggle member; 5431Y, pushing portion; 544Y, third avoidance portion; 550Y, third reset member; 560Y, fourth reset member; 571Y, first fixing cover; 5711Y, operating hole; 572Y, second fixing cover; A1, first pivot point; A2, second pivot point; A3, third pivot point; A4, fourth pivot point; A5, fifth pivot point; A6, sixth pivot point; F1, first direction; F2, second direction; 1000Z, cart frame; 100Z, hand frame; 110Z, upper hand frame; 111Z, first support tube; 112Z, push handle tube; 120Z, Lower handrail; 121Z, second support tube; 130Z, height adjustment locking mechanism; 131Z, second locking assembly; 1311Z, second locking member; 13111Z, locking tooth; 1312Z, driving member; 132Z, first locking portion; 133Z, second locking portion; 1331Z, bottom second locking portion; 1332Z, middle second locking portion; 1333Z, top second locking portion; 13 41Z, cover; 1342Z, penetration space; 135Z, third reset member; 136Z, support seat; 1361Z, first guide portion; 1363Z, first push-pushing inclined surface; 1364Z, second push-pushing inclined surface; 1365Z, first penetration channel; 1366Z, second penetration channel; 137Z, second traction member; 138Z, first connecting seat; 1381Z, first chamber; 1382Z, First locking groove; 139Z, second connecting seat; 1391Z, second chamber; 140Z, abutment; 200Z, wheel frame; 210Z, front wheel frame; 211Z, front rod; 212Z, front crossbar; 220Z, rear wheel frame; 221Z, rear rod; 222Z, rear crossbar; 230Z, wheel seat; 230AZ, front wheel seat; 230BZ, rear wheel seat; 240Z, wheel; 240 AZ, front wheel; 240BZ, rear wheel; 300Z, release mechanism; 310Z, first release member; 311Z, first connecting portion; 320Z, second release member; 321Z, second connecting portion; 330Z, operating member; 331Z, first drive unit; 332Z, second drive unit; 333Z, third drive unit; 334Z, fourth drive unit; 340Z, mounting base; 350Z, safety lock;351Z, first linking member; 3511Z, first abutting portion; 3512Z, third abutting portion; 352Z, second linking member; 3521Z, second abutting portion; 3522Z, fourth abutting portion; 353Z, toggle member; 3531Z, push member; 354Z, third avoidance portion; 360Z, fourth reset member; 370Z, fifth reset member; 381Z, first fixed cover; 3811Z, operating hole; 382Z, second fixed cover; 400Z, first pivot Socket; 500Z, wheel locking mechanism; 510Z, first locking element; 520Z, first locking recess; 530Z, second return element; 540Z, first traction element; 600Z, rider folding locking mechanism; 610Z, engaging element; 620Z, second locking recess; 630Z, fixing seat; 640Z, first return element; α1, first angle; α2, second angle; α3, third angle; α4, fourth angle; F1, first direction; F2, second direction. DETAILED DESCRIPTION

[0104] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0105] Figures 1 and 2 illustrate a stroller frame 1000X according to some embodiments of the present invention. The overall structure of the stroller frame 1000X is generally bilaterally symmetrical and may include a handlebar frame 200X, a wheel frame 300X, a height adjustment locking mechanism 400X (see Figures 7 and 8 ), a folding locking mechanism 500X (see Figures 3 and 4 ), and a release mechanism 100X according to some embodiments of the present invention. The following description of the stroller frame 1000X will further explain the handlebar frame 200X, the wheel frame 300X, the height adjustment locking mechanism 400X, the folding locking mechanism 500X, and the release mechanism 100X.

[0106] Continuing with Figures 1 and 2 , the stroller frame 1000X can be used as a stroller, pet stroller, or cargo stroller. The wheel frame 300X and the handlebar frame 200X are pivotally connected to each other, allowing the stroller frame 1000X to switch between an expanded state and a collapsed state (in other embodiments, the collapsed state may also be referred to as a folded state). Specifically, the handlebar frame 200X includes an upper handlebar frame 210X and a lower handlebar frame 220X that are movable relative to each other. The lower handlebar frame 220X is pivotally connected to the wheel frame 300X at one end distal from the upper handlebar frame 210X. More specifically, the wheel frame 300X includes a front wheel frame 310X and a rear wheel frame 320X that are pivotally connected. The lower handlebar frame 220X is pivotally connected to one of the front wheel frame 310X and the rear wheel frame 320X. For example, in this embodiment, the lower handlebar frame 220X is pivotally connected to the front wheel frame 310X. The specific structures of the wheel frame 300X (including the front wheel frame 310X and the rear wheel frame 320X) and the driver frame 200X (including the upper driver frame 210X and the lower driver frame 220X) will be further described below one by one.

[0107] Referring to Figures 1 and 2 , in one embodiment, the front wheel frame 310X is, for example, U-shaped and includes left and right front rods 311X and a front crossbar 312X connected between the two front rods 311X. The front crossbar 312X extends generally along a first direction F1, which corresponds to the left-right direction. When the stroller frame 1000X is used as a child stroller, the front crossbar 312X can also serve as a footrest.

[0108] In one embodiment, at least one front wheel seat 313X is mounted on the bottom of the front wheel frame 310X. Specifically, in this embodiment, as shown in Figures 1 and 2, two front wheel seats 313X are mounted on the bottom of the front wheel frame 310X, spaced apart in the left-right direction (i.e., the first direction F1). More specifically, the two front wheel seats 313X are mounted on the left and right ends of the front crossbar 312X, and the two front rods 311X are respectively connected to the front wheel seats 313X on the same side. Each front wheel seat 313X is used to mount a front wheel 610X, thereby enabling the cart frame 1000X to move. Of course, in alternative embodiments, the front wheel frame 310X can also have other embodiments, for example, the front wheel frame 310X can include only two front rods 311X, with one end of the two front rods 311X connected to form a V-shaped structure, and a front wheel seat 313X can be centrally mounted on the bottom of the front wheel frame 310X. Alternatively, for example, the front wheel frame 310X only includes two front rods 311X that are substantially parallel to each other in the left-right direction, and the two front wheel seats 313X are respectively connected to the two front rods 311X.

[0109] It should be noted that, unless otherwise expressly specified or limited, directional terms such as "left" and "right" regarding the cart frame 1000X in various embodiments of the present invention are based on the "left" and "right" orientations of the cart frame 1000X during normal travel. Arrows L and R are used in the figures to schematically indicate the "left" and "right" directions. These directional terms are used solely to clarify the description of the embodiments of the present invention and are not intended to unduly limit the scope of protection of the present invention.

[0110] In one embodiment, the rear wheel frame 320X can also have a U-shaped structure, for example, including two rear bars 321X located on the left and right sides and a rear crossbar (not shown) connected between the two rear bars 321X, with the rear crossbar extending along the first direction F1. Of course, in alternative embodiments, the rear wheel frame 320X can have other configurations, such as including only two rear bars 321X, with one end of the two rear bars 321X connected to form a V-shaped structure. Specifically, referring to Figures 1 and 2, in this embodiment, the rear wheel frame 320X can include two rear bars 321X arranged substantially parallel to each other in the left-right direction, and a reinforcement bar 322X connected between the two rear bars 321X. This improves the structural stability of the rear wheel frame 320X. Specifically, a rear wheel seat 323X is provided at the bottom end of each of the two rear bars 321X. Each rear wheel seat 323X is used to mount a rear wheel 620X, enabling the cart frame 1000X to be movable. In this embodiment, the size of the rear wheel 620X is larger than the size of the front wheel 610X to make the overall structure of the cart frame 1000X more stable. Of course, in another alternative embodiment, the size of the rear wheel 620X can be the same as or larger than the size of the front wheel 610X.

[0111] Specifically, in this embodiment, the upper ends of the two rear rods 321X are pivotally connected to the front rod 311X on the same side to form a pivot point. This means that the rear rod 321X on the same side can rotate relative to the front rod 311X on the same side about the corresponding pivot point. In this way, the volume of the wheel frame 300X can be changed.

[0112] Referring to Figures 1 and 2 , the handlebar 200X includes an upper handlebar 210X and a lower handlebar 220X, which are movable relative to each other. For example, the upper handlebar 210X can be slidably coupled to the lower handlebar 220X. This allows the height of the handlebar 200X relative to the ground to be adjusted, making it easier for users of different heights to grip and improving the applicability of the stroller frame 1000X. Specifically, the upper handlebar 210X has a U-shaped structure, for example, and includes two first support tubes 211X and a handle tube 212X connected between the two first support tubes 211X. The first support tubes 211X are straight tubes, and the handle tube 212X has a U-shaped structure and is connected between the two first support tubes 211X, for a user to grip and push the stroller frame 1000X. More specifically, the lower handrail 220X includes, for example, two second support tubes 221X. The upper ends of the two second support tubes 221X are, for example, respectively slidably coupled to the first support tubes 211X on the same side, and the lower ends of the two second support tubes 221X are, for example, respectively pivotally coupled to the front rod 311X on the same side. It should be noted that the slidable coupling of the two second support tubes 221X to the first support tubes 211X on the same side includes two implementations: the second support tubes 221X are sheathed around the first support tubes 211X, or the first support tubes 211X are sheathed around the second support tubes 221X. Specifically, in this embodiment, the second support tubes 221X sheathed around the first support tubes 211X are used as an example to illustrate the principle of coordination between the two.

[0113] To prevent the handlebar frame 200X from rotating freely relative to the wheel frame 300X and to maintain the cart frame 1000X in a stable deployed state, in one embodiment, the handlebar frame 200X and the wheel frame 300X can be restricted or permitted to pivot relative to each other using a folding and locking mechanism 500X. Furthermore, to prevent the upper handlebar frame 210X from moving freely relative to the lower handlebar frame 220X and to maintain the handlebar frame 200X at a specific height, in one embodiment, a height adjustment locking mechanism 400X can be employed to restrict or permit relative movement between the upper handlebar frame 210X and the lower handlebar frame 220X. The specific structures and operating principles of the folding and locking mechanisms 500X and 400X are further described below.

[0114] Referring to Figures 3 and 4 , in one embodiment, the retractable locking mechanism 500X includes a first locking member 510X and a fixing member 520X. The fixing member 520X is provided with a locking recess 521X and is mounted on either the wheel frame 300X or the lower handrail frame 220X. The first locking member 510X is movably mounted on the other of the wheel frame 300X and the lower handrail frame 220X and is operably connected to the first release member 110X. For example, when the fixing member 520X is mounted on the wheel frame 300X, the first locking member 510X is movably mounted on the lower handrail frame 220X. Alternatively, when the fixing member 520X is mounted on the lower handrail frame 220X, the first locking member 510X is movably mounted on the wheel frame 300X. Specifically, in this embodiment, the fixing member 520X is fixedly mounted within the front rod 311X of the front wheel frame 310X, and the first locking member 510X is movably mounted within the second support tube 221X of the lower handrail frame 220X. When the first locking member 510X is inserted into the locking recess 521X (see FIG3 ), the lower handrail frame 220X is restricted from pivoting relative to the wheel frame 300X. When the first locking member 510X is removed from the locking recess 521X (see FIG4 ), the lower handrail frame 220X can pivot relative to the wheel frame 300X.

[0115] In one embodiment, the folding and locking mechanism 500X further includes a first pulling member 530X (see Figures 3 and 4 ), which is connected to the first locking member 510X. Thus, a user can pull the first pulling member 530X to drive the first locking member 510X out of the locking recess 521X.

[0116] In one embodiment, the folding locking mechanism 500X further includes a third elastic member (not shown). The third elastic member abuts between the first locking member 510X and the lower handlebar 220X, and is used to reset the first locking member 510X so that the third elastic member is constantly inserted into the locking recess 521X. Specifically, the third elastic member can be, for example, a spring or a spring clip.

[0117] In this embodiment, in order to improve the stability of the folding and locking mechanism 500X when locked, two folding and locking mechanisms 500X are provided on the cart frame 1000X, and one of the folding and locking mechanisms 500X is provided between the front rod 311X and the second support tube 221X on the same side.

[0118] Referring to Figures 5 to 8 , in one embodiment, the height adjustment locking mechanism 400X includes a hand lock assembly 410X and a locking hole 420X. The locking hole 420X is provided on one of the upper hand frame 210X and the lower hand frame 220X, while the hand lock assembly 410X is provided on the other. Specifically, in this embodiment, the second support tube 221X of the lower hand frame 220X is provided with the locking hole 420X, and the first support tube 211X of the upper hand frame 210X is provided with the hand lock assembly 410X. The hand lock assembly 410X engages with the locking hole 420X. When the first support tube 211X and the corresponding second support tube 221X move relative to each other so that the hand lock assembly 410X faces the locking hole 420X, the hand lock assembly 410X is inserted into the locking hole 420X, locking the upper hand frame 210X and the lower hand frame 220X. More specifically, a plurality of locking holes 420X are provided, and the plurality of locking holes 420X are spaced apart along the sliding direction of the upper handrail 210X relative to the lower handrail 220X. Thus, when the handrail locking assembly 410X is inserted into different locking holes 420X, the upper handrail 210X can be maintained at different heights relative to the lower handrail 220X.

[0119] Referring to Figures 7 and 8, in one embodiment, as described above, the driver locking assembly 410X is arranged in the first support tube 211X of the upper hand frame 210X. The driver locking assembly 410X includes a moving member 411X and a second locking member 412X. The moving member 411X is movably arranged in the first support tube 211X of the upper hand frame 210X. Specifically, the moving member 411X is provided with a guide groove 4111X, which extends obliquely relative to the moving direction of the moving member 411X. The second locking member 412X has a guide post (not shown in the figure), which extends into the guide groove 4111X and slidably cooperates with the guide groove 4111X so as to be able to extend into or withdraw from the locking hole 420X. Specifically, in one embodiment, as shown in Figures 7 and 8, the driver lock assembly 410X further includes a support base 413X, which is fixedly disposed within the first support tube 211X. The second locking member 412X is movably disposed on the support base 413X so as to be able to extend into or retract from the locking hole 420X. More specifically, the driver lock assembly 410X further includes a fourth elastic member 414X (see Figure 8), which abuts between the support base 413X and the movable member 411X and is used to drive the movable member 411X to reset so that the second locking member 412X has a constant tendency to be inserted into the locking hole 420X. Specifically, the fourth elastic member 414X can also be an elastic member having elasticity, such as a spring or a shrapnel.

[0120] In one embodiment, the height adjustment locking mechanism 400X further includes a second pulling member 430X (see FIG. 12 ), which is connected to the movable member 411X. Thus, a user can pull the second pulling member 430X to move the movable member 411X, thereby indirectly driving the second locking member 412X to retract from the locking hole 420X.

[0121] In this embodiment, in order to improve the stability of the height adjustment locking mechanism 400X when locked, two height adjustment locking mechanisms 400X are provided on the cart frame 1000X, and one of the above-mentioned height adjustment locking mechanisms 400X is provided between the first support tube 211X and the second support tube 221X on the same side.

[0122] To improve user convenience in releasing the folding locking mechanism 500X and the height adjustment locking mechanism 400X, in some embodiments provided herein, a release mechanism 100X is capable of releasing the folding locking mechanism 500X and the height adjustment locking mechanism 400X, respectively. Specifically, as shown in Figures 9 and 10 , the release mechanism 100X includes a first release member 110X, a second release member 120X, and an operating member 130X. The first release member 110X is rotatably mounted on the stroller frame 1000X, for example, on the handlebar 200X or the wheel frame 300X. The first release member 110X is drivingly connected to the folding locking mechanism 500X to allow the lower handlebar 220X to pivot relative to the wheel frame 300X. Specifically, the first release member 110X is drivingly connected to the first locking member 510X in the folding locking mechanism 500X. The second release member 120X is rotatably mounted on the cart frame 1000X, for example, on the handlebar frame 200X or the wheel frame 300X. The second release member 120X is drivingly coupled to the height adjustment locking mechanism 400X to allow the upper handlebar frame 210X to move relative to the lower handlebar frame 220X. Specifically, the second release member 120X is drivingly coupled to the movable member 411X in the height adjustment locking mechanism 400X. An operating member 130X is movably mounted on the cart frame 1000X and is adapted to rotate either the first release member 110X or the second release member 120X.

[0123] Because the first release member 110X is rotatably disposed on the cart frame 1000X and is drivingly connected to the first locking member 510X, the second release member 120X is rotatably disposed on the cart frame 1000X and is drivingly connected to the movable member 411X, and the operating member 130X is movable and used to drive either the first release member 110X or the second release member 120X to rotate, a user can control the rotation of the first release member 110X by driving the operating member 130X, thereby indirectly controlling the first locking member 510X in the retractable locking mechanism 500X. When the first locking member 510X is inserted into the locking recess 521X, the cart frame 1000X can be maintained in the deployed state. When the first locking member 510X is removed from the locking recess 521X, the cart frame 1000X can be switched from the deployed state to the locked state. At the same time, the user can also control the rotation of the second release member 120X by driving the operating member 130X, thereby indirectly controlling the movable member 411X and the second locking member 412X in the height adjustment locking mechanism 400X. When the second locking member 412X is inserted into the locking hole 420X, the upper handrail 210X and the lower handrail 220X cannot slide relative to each other. When the second locking member 412X is removed from the locking hole 420X, the upper handrail 210X and the lower handrail 220X can slide relative to each other, thereby adjusting the height of the handrail 200X. Because the user can control different locking mechanisms by simply operating the release mechanism 100X, user convenience is improved.

[0124] To facilitate user operation of the release mechanism 100X, as shown in Figures 9 to 11 , the release mechanism 100X is mounted on the push handle tube 212X of the upper handlebar 210X. Specifically, the first release member 110X and the second release member 120X are both disc-shaped and rotatably mounted on the push handle tube 212X via connectors such as axle pins. More specifically, the first release member 110X is provided with a first connecting portion 111X. The first connecting portion 111X is offset from the rotation center of the first release member 110X, for example, in a straight line or in a non-linear arrangement, but this is not a limitation. The first connecting portion 111X is used to connect to the retractable locking mechanism 500X. Specifically, referring to Figures 3, 12, and 13 , the first connecting portion 111X is connected to the first locking member 510X of the retractable locking mechanism 500X via a first pulling member 530X. When the first release member 110X rotates about its rotational center, the first connecting portion 111X rotates synchronously about the rotational center of the first release member 110X, thereby driving the first pulling member 530X to move, pulling the first release member 110X away from the locking recess 521X. Similarly, the second release member 120X is provided with a second connecting portion 121X. The second connecting portion 121X is offset from the rotational center of the second release member 120X, for example, in a straight line or in a non-linear arrangement, but this is not a limitation. The second connecting portion 121X is used to connect to the height adjustment locking mechanism 400X. Specifically, referring to Figures 14 and 15, the second connecting portion 121X is connected to the movable member 411X of the height adjustment locking mechanism 400X via the second pulling member 430X. When the second release member 120X rotates around its rotation center, the second connecting portion 121X will rotate synchronously around the rotation center of the second release member 120X, thereby driving the second traction member 430X to move to pull the movable member 411X to move. Under the action of the guide groove 4111X, the first locking member 510X will be driven to move to withdraw from the locking hole 420X.

[0125] Specifically, in this embodiment, the first pulling member 530X and the second pulling member 430X can both be pulling ropes, for example. More specifically, the first release member 110X is provided with two first connecting portions 111X, and the second release member 120X is provided with two second connecting portions 121X. The two first connecting portions 111X are respectively connected to the two first pulling members 530X, and the two second connecting portions 121X are respectively connected to the two second pulling members 430X. Thus, when the first release member 110X rotates, it simultaneously controls the movement of the two first locking members 510X to retract from the corresponding locking recesses 521X. When the second release member 120X rotates, it simultaneously controls the movement of the two moving members 411X, thereby controlling the movement of the two second locking members 412X to retract from the corresponding locking holes 420X.

[0126] 9 and 12 to 15 , the release mechanism 100X further includes a safety lock 140X (in other embodiments, the safety lock 140X may also be referred to as a frame folding safety lock 140X). The safety lock 140X is movably mounted on the stroller frame 1000X and can be switched between a first position and a second position. When the safety lock 140X is moved to the first position, the operating member 130X is driven to connect with the first release member 110X via the safety lock 140X. When the safety lock 140X is moved to the second position, the operating member 130X is driven to connect with the second release member 120X via the safety lock 140X. Specifically, when a user desires to release the folding lock mechanism 500X to switch the stroller frame 1000X from the deployed state to the folded state, the safety lock 140X is moved to the first position. Operating the operating member 130X then causes the first release member 110X to rotate. When the user needs to release the height adjustment locking mechanism 400X to adjust the height of the hand frame 200X, the safety lock 140X can be moved to the second position. In this way, the second release member 120X can be rotated by operating the operating member 130X.

[0127] Referring to Figures 12 to 15 , in one embodiment, the safety lock 140X includes a toggle member 141X, a first linking member 142X, and a second linking member 143X. The toggle member 141X is movably disposed on the cart frame 1000X (e.g., the handle tube 212X) along a first direction F1 and is switchable between a first position and a second position. The first linking member 142X is movably connected to the toggle member 141X along a second direction F2 and is drivably connected to the first release member 110X. The second linking member 143X is movably connected to the toggle member 141X along a second direction F2 and is drivably connected to the second release member 120X. The first direction F1 intersects the second direction F2, and the operating member 130X is movable relative to the cart frame 1000X along the second direction F2. Specifically, when the toggle member 141X is in the first position, the operating member 130X can be operated to push the first linking member 142X to move in the second direction F2, thereby rotating the first release member 110X. When the toggle member 141X is in the second position, the operating member 130X can be operated to push the second linking member 143X to move in the second direction F2, thereby rotating the second release member 120X.

[0128] Continuing with Figures 12 to 15 , in one embodiment, the first linking member 142X has a first abutting portion 1421X, and the second linking member 143X has a second abutting portion 1431X. The operating member 130X has a first driving portion 131X and a second driving portion 132X spaced apart from each other. As shown in Figures 12 and 13 , when the toggle member 141X is in the first position, the first abutting portion 1421X aligns with the first driving portion 131X, while the second abutting portion 1431X is offset from the second driving portion 132X. Consequently, when the operating member 130X moves upward in the second direction F2, the first driving portion 131X abuts against the first abutting portion 1421X, thereby pushing the first linking member 142X in the second direction F2. This in turn drives the first release member 110X to rotate, ultimately releasing the retractable locking mechanism 500X. At the same time, because the second abutment portion 1431X is offset from the second driving portion 132X, when the operating member 130X moves upward in the second direction F2, the second driving portion 132X does not contact the second abutment portion 1431X. Consequently, the second linkage member 143X and the second release member 120X remain stationary. This means that when the operating member 130X is operated, it does not affect the height adjustment locking mechanism 400X. As shown in Figures 14 and 15, when the toggle member 141X is in the second position, the second abutment portion 1431X aligns with the second driving portion 132X, and the first abutment portion 1421X is offset from the first driving portion 131X. Thus, when the operating member 130X moves upward in the second direction F2, the second driving portion 132X abuts against the second abutting portion 1431X, thereby pushing the second linking member 143X to move in the second direction F2, thereby driving the second release member 120X to rotate, ultimately releasing the height adjustment locking mechanism 400X. Simultaneously, because the first abutting portion 1421X is offset from the first driving portion 131X, when the operating member 130X moves upward in the second direction F2, the first driving portion 131X does not contact the first abutting portion 1421X. Consequently, the first linking member 142X and the first release member 110X remain stationary. This means that when the operating member 130X is operated, it does not affect the retractable locking mechanism 500X.

[0129] Referring again to Figures 12 to 15 , in one embodiment, the operating member 130X further includes a third driving portion 133X and a fourth driving portion 134X. The third driving portion 133X and the fourth driving portion 134X are spaced apart and located between the first driving portion 131X and the second driving portion 132X. The first linking member 142X and the second linking member 143X are spaced apart, forming a third relief portion 144X therebetween. Specifically, the first linking member 142X further includes a third abutting portion 1422X, and the second linking member 143X further includes a fourth abutting portion 1432X. As shown in Figures 12 and 13 , when the toggle member 141X is in the first position, the third abutting portion 1422X abuts against the third driving portion 133X, the first abutting portion 1421X abuts against the first driving portion 131X, and the fourth driving portion 134X abuts against the third relief portion 144X. Therefore, when the operating member 130X moves upward in the second direction F2, the first driving portion 131X can abut against the first abutting portion 1421X, and the third abutting portion 1422X can abut against the third driving portion 133X, thereby simultaneously pushing the first linking member 142X to move in the second direction F2. Simultaneously, as the operating member 130X moves upward in the second direction F2, the fourth driving portion 134X gradually inserts into the third avoiding portion 144X, preventing the second linking member 143X from moving when the toggle member 141X is in the first position. As shown in Figures 14 and 15, when the toggle member 141X is in the second position, the fourth abutting portion 1432X abuts against the fourth driving portion 134X, the second abutting portion 1431X abuts against the second driving portion 132X, and the third driving portion 133X abuts against the third avoiding portion 144X. Therefore, when the operating member 130X moves upward in the second direction F2, the second driving portion 132X can abut against the second abutting portion 1431X, and the fourth abutting portion 1432X can abut against the fourth driving portion 134X, thereby simultaneously pushing the second linking member 143X to move in the second direction F2. At the same time, as the operating member 130X moves upward in the second direction F2, the third driving portion 133X gradually inserts into the third avoiding portion 144X, preventing the first linking member 142X from being driven to move when the toggle member 141X is in the second position.

[0130] Referring to Figures 12 and 14, in one embodiment, the release mechanism 100X further includes a first elastic member 150X. The first elastic member 150X abuts between the cart frame 1000X (e.g., the handle tube 212X) and the toggle member 141X, providing an elastic restoring force to the toggle member 141X, thereby maintaining the toggle member 141X in the first or second position. For example, when the first elastic member 150X is used to constantly maintain the toggle member 141X in the first position, if the retractable locking mechanism 500X needs to be released, the operating member 130X can be directly operated (e.g., by pressing or pushing upward). If the height adjustment locking mechanism 400X needs to be released, the toggle member 141X must first be moved to the second position before operating the operating member 130X. After the height adjustment locking mechanism 400X is released, the toggle member 141X is released, and the toggle member 141X automatically returns to the first position under the restoring action of the first elastic member 150X.

[0131] In one embodiment, as shown in Figures 12 and 14, a first clearance portion 1423X is formed between the first abutting portion 1421X and the third abutting portion 1422X. A second clearance portion 1433X is formed between the second abutting portion 1431X and the fourth abutting portion 1432X. Specifically, when the toggle member 141X is in the first position and the operating member 130X is operated, the second clearance portion 1433X is used to clear the second driving portion 132X. When the toggle member 141X is in the second position and the operating member 130X is operated, the first clearance portion 1423X is used to clear the first driving portion 131X.

[0132] In one embodiment, one of the first linking member 142X and the first release member 110X has a first guide recess (not shown), and the other has a first mating protrusion (not shown). The first mating protrusion is slidably disposed within the first guide recess, and the first guide recess extends along the first direction F1. Similarly, one of the second linking member 143X and the second release member 120X has a second guide recess (not shown), and the other has a second mating protrusion (not shown). The second mating protrusion is slidably disposed within the second guide recess, and the second guide recess extends along the first direction F1. In this way, when the toggle member 141X switches between the first position and the second position along the first direction F1, it can drive the first linking member 142X and the second linking member 143X to move left and right along the first direction F1 at the same time, so that the first release member 110X and the second release member 120X remain stationary; at the same time, when the first linking member 142X moves up and down along the second direction F2, the first linking member 142X can also drive the first release member 110X to rotate; and when the second linking member 143X moves up and down along the second direction F2, the second linking member 143X can also drive the second release member 120X to rotate.

[0133] In one embodiment, the operating member 130X has an initial position (see Figures 12 and 14) and a release position (see Figures 13 and 15) when moving in the second direction F2. When the operating member 130X is in the initial position, the operating member 130X can be operated to move to push the first linking member 142X or the second linking member 143X to move. In other words, when the operating member 130X is in the initial position, a gap can be left between the first driving portion 131X and the first abutting portion 1421X, and between the third driving portion 133X and the third abutting portion 1422X (or between the second driving portion 132X and the second abutting portion 1431X, and between the fourth driving portion 134X and the fourth abutting portion 1432X) on the operating member 130X, or they can just barely contact each other. In this way, the first linking member 142X (or the second linking member 143X) can be pushed upward by pushing or pressing the operating member 130X upward. When the operating member 130X is located at the unlocking position, the operating member 130X pushes the first linking member 142X or the second linking member 143X.

[0134] Referring to Figures 11 to 13 , in one embodiment, the release mechanism 100X further includes a second elastic member 160X. The second elastic member 160X abuts between the cart frame 1000X and the operating member 130X, providing an elastic restoring force to the operating member 130X, thereby maintaining the operating member 130X in its initial position. The second elastic member 160X may also be, for example, a spring or a spring sheet. Specifically, in this embodiment, as shown in Figures 9 and 11 , the second elastic member 160X is a spring. The operating member 130X is provided with a limiting post 135X. The spring is sleeved around the limiting post 135X, with its ends respectively abutting against the operating member 130X and the handle tube 212X.

[0135] 9 and 11 , in one embodiment, one of the first release member 110X and the cart frame 1000X is provided with a first stop recess 2121X, and the other is provided with a first stop protrusion 112X. When the operating member 130X is switched to the initial position, the first stop protrusion 112X abuts against one sidewall of the first stop recess 2121X. When the operating member 130X is switched to the release position, the first stop protrusion 112X abuts against the other sidewall of the first stop recess 2121X. This allows the rotational direction of the first release member 110X to be controlled, preventing the first release member 110X from being unable to pull the first locking member 510X out of the locking recess 521X via the first pulling member 530X during rotation due to rotation not following the predetermined direction. Furthermore, the distance between the two opposing sidewalls of the first stop recess 2121X defines the rotational range of the first stop protrusion 112X about the rotational center of the first release member 110X. Specifically, the handle tube 212X is provided with a first stop recess 2121X, and the first release member 110X is provided with a first stop protrusion 112X. Similarly, one of the second release member 120X and the cart frame 1000X is provided with a second stop recess 2122X, while the other is provided with a second stop protrusion 122X. When the operating member 130X is switched to the initial position, the second stop protrusion 122X abuts against one sidewall of the second stop recess 2122X. When the operating member 130X is switched to the unlocked position, the second stop protrusion 122X abuts against the other sidewall of the second stop recess 2122X. This allows the rotational direction of the second release member 120X to be controlled, preventing the second release member 120X from being unable to move the movable member 411X via the second pulling member 430X during rotation due to rotation not following the predetermined direction. Furthermore, the distance between the two opposing sidewalls of the second stop recess 2122X defines the rotational range of the second stop protrusion 122X about the rotational center of the second release member 120X. Specifically, the handle tube 212X is provided with the second stop recess 2122X, and the second release member 120X is provided with the second stop protrusion 122X.

[0136] Referring to Figures 6 and 11 , in one embodiment, the release mechanism 100X further includes a first fixing cover 171X and a second fixing cover 172X. The first fixing cover 171X is positioned on the top of the handle tube 212X, while the second fixing cover 172X is positioned on the bottom of the handle tube 212X. The second fixing cover 172X is provided with a through-hole for the operating member 130X to pass through. The first fixing cover 171X and the second fixing cover 172X are coupled and secured to the handle tube 212X. This prevents the operating member 130X and other components from being dislodged from the handle tube 212X. Furthermore, enclosing the first and second fixing covers 171X, 172X over the first and second release members 110X, 120X, and safety lock 140X further simplifies and enhances the appearance of the release mechanism 100X and the cart frame 1000X. Specifically, as shown in FIG6 , an operating hole 1711X is provided on the first fixed cover 171X, and a pushing portion 1411X is provided on the toggle member 141X. The pushing portion 1411X can pass through the operating hole 1711X for the user to hold. The user can change the position of the toggle member 141X by pushing the pushing portion 1411X.

[0137] Figures 16 and 17 illustrate a stroller frame 1000Y according to some embodiments of the present invention. The overall structure of the stroller frame 1000Y is generally bilaterally symmetrical and can be used as a frame for a child stroller, a pet stroller, or a cargo cart. For example, in this embodiment, the stroller frame 1000Y is used as a child stroller frame to illustrate its structure and operating principle.

[0138] 16 to 18 , in one embodiment, a cart frame 1000Y may include, for example, a handlebar frame 100Y, a wheel frame 200Y, a reversing locking mechanism 300Y (see FIGS. 19 and 20 ), a folding locking mechanism 400Y (see FIGS. 19 and 20 ), and a release mechanism 500Y according to some embodiments of the present invention. Since the cart frame 1000Y has a symmetrical structure, the following description will primarily focus on one side of the cart frame 1000Y as an example. While the handlebar frame 100Y, wheel frame 200Y, reversing locking mechanism 300Y, folding locking mechanism 400Y, and release mechanism 500Y will also be described.

[0139] Continuing with Figures 16 to 18 , in one embodiment, the handrail 100Y is rotatably mounted on the wheel frame 200Y. Thus, the handrail 100Y can rotate relative to the wheel frame 200Y to change direction; alternatively, the handrail 100Y can rotate relative to the wheel frame 200Y to fold, allowing the cart frame 1000Y to switch between an expanded state (see Figures 16 and 18 ) and a collapsed state (in other embodiments, the collapsed state may also be referred to as a folded state or collapsed state) (see Figures 23 and 24 ). In one embodiment, as shown in Figures 16 to 18 , the handrail 100Y is pivotally connected to the wheel frame 200Y at a first pivot point A1, allowing the handrail 100Y to have a first use position (see Figure 16 ) and a second use position (not shown) relative to the wheel frame 200Y. Specifically, the handrail 100Y can pivot relative to the first pivot point A1, allowing the handrail 100Y to switch between the first use position and the second use position. Considering the orientation of the cart frame 1000Y, in this embodiment, when the handrail 100Y is in the first use position, the top of the handrail 100Y is located on a first side of the wheel frame 200Y. When the handrail 100Y is in the second use position, the top of the handrail 100Y is located on a second side of the wheel frame 200Y. The first side and the second side are positioned opposite each other with respect to the direction of travel of the cart frame 1000Y (i.e., the front-to-back direction).

[0140] It should be noted that, unless otherwise expressly specified or limited, directional terms such as "left," "right," "front," and "rear" of the cart frame 1000Y in the various embodiments of the present invention are based on the "left," "right," "front," and "rear" orientations of the cart frame 1000Y in the first use position and during normal travel. In the figures, arrows L and R schematically indicate "left" and "right," while arrows P and B schematically indicate "front" and "rear." These directional terms are used solely to clarify the description of the embodiments of the present invention and are not intended to improperly limit the scope of protection of the present invention.

[0141] Referring to Figures 16 and 17 , in one embodiment, the handle frame 100Y is, for example, U-shaped and includes support tubes 110Y located on the left and right sides and a handle tube 120Y connected between the two support tubes 110Y. The support tubes 110Y are straight tubes, and the handle tube 120Y is U-shaped and connected between the two support tubes 110Y, for the user to grasp and push the cart frame 1000Y. Specifically, the handle tube 120Y is connected to the top of the support tube 110Y, and the bottom end of the support tube 110Y is pivotally connected to the wheel frame 200Y at a first pivot point A1. Of course, in other embodiments, the support tube 110Y may also be a non-straight tube structure, or the handle tube 120Y may also be a straight tube structure, without specific limitation herein.

[0142] Referring to Figures 16 to 18 , in one embodiment, the wheel frame 200Y may include, for example, a front wheel frame 210Y, a rear wheel frame 220Y, and a first transmission member 230Y. The front wheel frame 210Y is pivotally connected to the rear wheel frame 220Y to form a second pivot point A2. The front wheel frame 210Y is located in front of the rear wheel frame 220Y in the front-to-back direction of the cart frame 1000Y. Wheels 270Y are connected to the bottoms of both the front wheel frame 210Y and the rear wheel frame 220Y. The first transmission member 230Y is pivotally connected between the rear wheel frame 220Y and the rider frame 100Y. Specifically, a first end of the first transmission member 230Y is pivotally connected to the rider frame 100Y to form the aforementioned first pivot point A1, and a second end of the first transmission member 230Y is pivotally connected to the rear wheel frame 220Y to form a third pivot point A3. Therefore, in combination with the wheel frame 200Y, the above-mentioned "first side" can be regarded as the side of the rear wheel frame 220Y away from the front wheel frame 210Y, and the "second side" can be regarded as the side of the front wheel frame 210Y away from the rear wheel frame 220Y.

[0143] In one embodiment, the stroller frame 1000Y further includes a seat assembly (not shown) disposed on the wheel frame 200Y for a child to sit on. When the handrail 100Y is in a first use position (see Figures 16 and 18), if a user wishes to push the stroller frame 100Y via the handrail 100Y, the user must stand behind the stroller frame 100Y to hold the handrail 100Y, with the user facing away from the child's face. When the handrail 100Y is in a second use position, if a user wishes to push the stroller frame 100Y via the handrail 100Y, the user must stand in front of the stroller frame 100Y to hold the handrail 100Y, with the user facing toward the child's face.

[0144] To prevent the handrail 100Y from rotating freely relative to the wheel frame 200Y for reversing; in other words, to ensure that the handrail 100Y remains stably in the first or second use position, in one embodiment, the handrail 100Y and the wheel frame 200Y can utilize a reversing locking mechanism 300Y to restrict or allow the handrail 100Y to rotate relative to the wheel frame 200Y for reversing. Specifically, in this embodiment, to enhance the stability of the reversing locking mechanism 300Y when locked, two reversing locking mechanisms 300Y are provided on the cart frame 1000Y, one on each left and right side of the cart frame 1000Y.

[0145] Referring to Figures 16, 19, and 20, in one embodiment, a reversing locking mechanism 300Y is disposed between the handlebar frame 100Y and the wheel frame 200Y. The reversing locking mechanism 300Y may include a first locking member 310Y, a first engaging member 320Y, and a second engaging member 330Y. The first engaging member 320Y and the second engaging member 330Y are circumferentially spaced apart on the wheel frame 200Y around a first pivot point A1. The first locking member 310Y is disposed on the handlebar frame 100Y and is adapted to engage with either the first engaging member 320Y or the second engaging member 330Y. When the first locking member 310Y engages with the first engaging member 320Y, the handlebar frame 100Y is in a first use position. When the first locking member 310Y engages with the second engaging member 330Y, the handlebar frame 100Y is in a second use position.

[0146] Referring to Figures 19 to 22 , in one embodiment, the first locking member 310Y has a locking portion 311Y, and the first engaging member 320Y and the second engaging member 330Y each have a matching locking portion 301Y adapted to engage with the locking portion 311Y. One of the locking portion 311Y and the matching locking portion 301Y may be a protrusion, and the other may be a groove. The protrusion and the groove may lock together through a concave-convex engagement. Specifically, the first locking member 310Y is movably disposed on the handlebar frame 100Y and has a first locking position and a first unlocking position. When the first locking member 310Y is in the first locking position, the locking portion 311Y engages with the matching locking portion 301Y, restricting the handlebar frame 100Y from switching between the first and second use positions. When the first locking member 310Y is in the first unlocking position, the locking portion 311Y disengages from the matching locking portion 301Y, allowing the handlebar frame 100Y to switch between the first and second use positions. More specifically, the first locking member 310Y is a sliding sleeve structure, which is sleeved outside the support tube 110Y of the hand frame 100Y and can slide along the length direction of the support tube 110Y so as to be able to move between a first locking position and a first unlocking position.

[0147] With reference to Figures 16, 21, and 22, in one embodiment, the reversing locking mechanism 300Y may further include a first driving member 340Y and a first pulling member 350Y. The first driving member 340Y is movably disposed on the hand frame 100Y and connected to the first locking member 310Y, and the first pulling member 350Y is connected to the first driving member 340Y. In this way, the first pulling member 350Y can drive the first driving member 340Y to move, thereby driving the first locking member 310Y to move. Specifically, in this embodiment, the first driving member 340Y and the first pulling member 350Y are both movably disposed in the inner cavity of the hand frame 100Y, and the first driving member 340Y is fixedly connected to the first locking member 310Y via a first connecting member 360Y (such as a shaft or pin, etc.) that passes through the hand frame 100Y. It should be noted that since the support tube 110Y and the handle tube 120Y are both hollow tubular structures, the "inner cavity of the handle frame 100Y" may refer to the tubular inner cavity of the support tube 110Y and / or the handle tube 120Y. Disposing the first driving member 340Y and the first pulling member 350Y within the inner cavity of the handle frame 100Y not only improves space utilization but also makes the handle frame 100Y more neat and aesthetically pleasing.

[0148] In one embodiment, as shown in Figures 21 and 22 , a fixed support seat 130Y is provided within the inner cavity of the hand frame 100Y. Specifically, the fixed support seat 130Y is disposed within the support tube 110Y and is used to support the first driving member 340Y. In one embodiment, the reversing locking mechanism 300Y further includes a first return member 370Y, which may be a resilient return member such as a spring or a spring. The first return member 370Y abuts between the first driving member 340Y and the fixed support seat 130Y and is used to reset the first driving member 340Y, ensuring that the first driving member 340Y constantly tends to force the first locking member 310Y to the first locked position. Thus, when the pulling force acting on the first pulling member 350Y ceases, the first driving member 340Y automatically resets under the return force of the first return member 370Y and drives the first locking member 310Y to the first locked position.

[0149] In one embodiment, when the hand frame 100Y is pivoted about the first pivot point A1, the hand frame 100Y also has a third use position relative to the wheel frame 200Y. Specifically, as shown in Figures 16 and 18 , when the hand frame 100Y is in the first use position, the hand frame 100Y and the wheel frame 200Y are separated from each other about the first pivot point A1, so that the cart frame 1000Y is in an extended state. As shown in Figures 23 and 24 , when the hand frame 100Y is in the third use position, the hand frame 100Y and the wheel frame 200Y are moved closer together about the first pivot point A1, so that the cart frame 1000Y is in a retracted state.

[0150] 16, 19, 20, and 25, in one embodiment, the wheel frame 200Y further includes an armrest 240Y, a second transmission member 250Y, and a third transmission member 260Y. The top of the front wheel frame 210Y and the top of the rear wheel frame 220Y are both pivotally connected to the armrest 240Y, forming the aforementioned second pivot point A2 on the armrest 240Y. The first end of the second transmission member 250Y is pivotally connected to the front wheel frame 210Y to form a fourth pivot point A4. The second end of the second transmission member 250Y extends toward the rear wheel frame 220Y and is pivotally connected to the first end of the third transmission member 260Y to form a fifth pivot point A5. The second end of the third transmission member 260Y is pivotally connected to the armrest 240Y to form a sixth pivot point A6. Among them, the second transmission member 250Y can be used to support the above-mentioned seat assembly. When a child sits on the seat assembly, his arms can be placed on the armrest member 240Y. This not only improves the riding comfort, but also the armrest member 240Y can limit the child's riding space and prevent the child from falling from the seat assembly.

[0151] Specifically, referring to Figures 19, 20, and 25, in this embodiment, the third transmission member 260Y and the hand frame 100Y are arranged parallel to each other in the left-right direction and are respectively located on the left and right sides of the first transmission member 230Y. The first end of the third transmission member 260Y passes through the first transmission member 230Y and is fixedly connected to the hand frame 100Y via a fixing member (not shown in the figure). It should be noted that in this embodiment, the connection point between the third transmission member 260Y and the hand frame 100Y is coaxial with the first pivot point A1. In addition, the pivot point between the second transmission member 250Y and the third transmission member 260Y (i.e., the fifth pivot point A5) is coaxial with the first pivot point A1.

[0152] Referring to Figures 16, 17, 19, and 20, in this embodiment, when the handlebar frame 100Y is fixed relative to the first transmission member 230Y, the third transmission member 260Y also remains fixed relative to the first transmission member 230Y. That is, the third transmission member 260Y cannot rotate about the first pivot point A1. Thus, the armrest 240Y, the rear wheel frame 220Y, the first transmission member 230Y, and the third transmission member 260Y remain relatively fixed. Simultaneously, the third transmission member 260Y also remains fixed relative to the second transmission member 250Y, allowing the second transmission member 250Y to be stably supported between the front wheel frame 210Y and the rear wheel frame 220Y. Consequently, the cart frame 100Y can be stably maintained in the deployed state. When the handrail 100Y rotates relative to the first transmission member 230Y about the first pivot point A1, the handrail 100Y can simultaneously drive the third transmission member 260Y to rotate about the fifth pivot point A5 and the sixth pivot point A6 via the fixed member. During this process, the handrail 100Y also drives the first transmission member 230Y to pivot about the third pivot point A3. Simultaneously, the third transmission member 260Y drives the armrest 240Y to rotate about the second pivot point A2, while simultaneously driving the second transmission member 250Y to pivot about the fourth pivot point A4, thereby rotating the front wheel frame 210Y and the rear wheel frame 220Y relative to the second pivot point A2, ultimately achieving the folding of the cart frame 1000Y. The folding process of the cart frame 1000Y will be described later.

[0153] To prevent the handrail 100Y from rotating freely relative to the wheel frame 200Y for folding, in other words, to ensure that the handrail 100Y can be stably maintained in the first or third use position, in one embodiment, the handrail 100Y and the wheel frame 200Y can be configured to restrict or allow the handrail 100Y to rotate relative to the wheel frame 200Y for folding by means of a folding locking mechanism 400Y. Specifically, in this embodiment, to enhance the stability of the folding locking mechanism 400Y when locked, two folding locking mechanisms 400Y are provided on the cart frame 1000Y, one on each left and right side of the cart frame 1000Y.

[0154] Referring to Figures 19 and 20 , in one embodiment, a folding locking mechanism 400Y is disposed between the handlebar frame 100Y and the wheel frame 200Y. The folding locking mechanism 400Y includes a second locking member 410Y that is movable relative to the handlebar frame 100Y and has a second locked position and a second released position. Specifically, the second locking member 410Y is movably disposed on the third transmission member 260Y. Of course, in other embodiments, the second locking member 410Y may also be movably disposed on the handlebar frame 100Y, and this is not specifically limited here. Specifically, when the second locking member 410Y moves to the second locked position, it engages with the first transmission member 230Y (see Figure 19 ). This restricts the third transmission member 260Y from pivoting relative to the first transmission member 230Y, and thus restricts the handlebar frame 100Y from pivoting relative to the first transmission member 230Y, ultimately preventing the handlebar frame 100Y from switching between the first and third use positions. When the second locking member 410Y moves to the second unlocking position, the second locking member 410Y disengages from the first transmission member 230Y (see FIG. 20 ), thereby allowing the third transmission member 260Y to pivot relative to the first transmission member 230Y, and also allowing the handrail frame 100Y to pivot relative to the first transmission member 230Y, thereby ultimately allowing the handrail frame 100Y to switch between the first use position and the third use position.

[0155] In one embodiment, the first transmission member 230Y has a first recess (not shown in the figure) and a second recess (not shown in the figure). Specifically, the first recess and the second recess are both located at one end of the first transmission member 230Y close to the first pivot point A1, and the two are arranged relative to each other roughly along the circumference of the first pivot point A1. When the cart frame 1000Y is in the expanded state, the second locking member 410Y engages with the first recess (see Figure 19) to keep the cart frame 1000Y in the expanded state. When the cart frame 1000Y is in the folded state, the second locking member 410Y engages with the second recess (see Figure 26) to keep the cart frame 1000Y in the folded state, preventing the cart frame 1000Y from accidentally expanding during transportation or storage.

[0156] Referring to Figures 19, 20, 27, and 28, in one embodiment, the folding and locking mechanism 400Y further includes a second drive assembly 420Y and a second pulling member 430Y. The second drive assembly 420Y is movably mounted on the handlebar frame 100Y and engages with the second locking member 410Y. The second pulling member 430Y is connected to the second drive assembly 420Y. In this manner, the second pulling member 430Y can drive the second drive assembly 420Y to move, thereby driving the second locking member 410Y to move. Specifically, the second drive assembly 420Y includes a second sliding sleeve 421Y and a second driving member 422Y. The second sliding sleeve 421Y is mounted on the support tube 110Y of the handlebar frame 100Y and can slide along the length of the support tube 110Y. The second sliding sleeve 421Y can abut or connect with the second locking member 410Y. The second driving member 422Y is movably mounted on the fixed support base 130Y within the inner cavity of the handlebar frame 100Y and is connected to the second sliding sleeve 421Y via a second connecting member 450Y (such as a shaft or pin). The second pulling member 430Y is movably mounted within the inner cavity of the handlebar frame 100Y and is connected to the second driving member 422Y. When the second pulling member 430Y moves, it drives the second driving member 422Y, which in turn drives the second sliding sleeve 421Y, thereby moving the second locking member 410Y from the second locking position to the second unlocking position.

[0157] In conjunction with Figures 19, 20, 27, and 28, in one embodiment, the folding locking mechanism 400Y further includes a second reset member 440Y and a fifth reset member (not shown in the figures). The second reset member 440Y and the fifth reset member can be, for example, elastic reset members such as springs or shrapnel. As shown in Figures 27 and 28, the second reset member 440Y abuts between the second driving member 422Y and the fixed support seat 130Y to drive the second driving member 422Y to reset. The fifth reset member provides an elastic restoring force for the second locking member 410Y to bias it toward the second locking position. Specifically, in this embodiment, the second sliding sleeve 421Y drives the second locking member 410Y to move from the second locking position to the second unlocking position by pushing. Therefore, when the second driving member 422Y is reset to drive the second sliding sleeve 421Y to reset, the second sliding sleeve 421Y will separate from the second locking member 410Y, and the second locking member 410Y will automatically move from the second unlocked position to the second locked position under the elastic restoring force of the fifth restoring member. In this way, when the pulling force acting on the second pulling member 430Y no longer exists, the second driving member 422Y will automatically reset under the restoring force of the second restoring member 440Y and drive the second sliding sleeve 421Y to reset and disengage from the second locking member 410Y. The second locking member 410Y will automatically move to the second locked position under the restoring force of the fifth restoring member.

[0158] The following briefly describes the folding process of the cart frame 1000Y with reference to relevant diagrams.

[0159] Please refer to Figures 16, 17, 19 and 20. In this embodiment, when the cart frame 1000Y is in the expanded state, the second locking member 410Y is in the second locking position and extends into the first recess of the third transmission member 260Y to limit the third transmission member 260Y and the hand frame 100Y from rotating around the first pivot point A1 relative to the first transmission member 230Y, and at the same time limit the third transmission member 260Y from rotating relative to the first transmission member 230Y. In this way, the first transmission member 230Y can form a fixed four-bar structure with the third transmission member 260Y, the armrest member 240Y and the rear wheel frame 220Y, and the second transmission member 250Y can also be stably supported between the front wheel frame 210Y and the rear wheel frame 220Y to keep the cart frame 1000Y in the expanded state. Specifically, the rods between the sixth pivot point A6, the second pivot point A2, the third pivot point A3 and the first pivot point A1 (or the fifth pivot point A5) form a four-bar structure, and any two adjacent and connected links are relatively fixed.

[0160] When the cart frame 1000Y needs to be switched from the expanded state to the collapsed state, the second locking member 410Y is moved to the second unlocking position, allowing the second locking member 410Y to retract from the first recess of the third transmission member 260Y. This allows both the handrail 100Y and the third transmission member 260Y to rotate counterclockwise relative to the first transmission member 230Y about the first pivot point A1. When both the handrail 100Y and the third transmission member 260Y rotate relative to the first transmission member 230Y, a four-bar linkage is formed between the armrest 240Y, the rear wheel frame 220Y, the first transmission member 230Y, and the third transmission member 260Y (or the handrail 100Y), allowing two adjacent, connected links to pivot relative to each other. In this way, the folding of the handrail 100Y relative to the wheel frame 200Y and the folding of the wheel frame 200Y itself (i.e., the relative folding of the front wheel frame 210Y, the rear wheel frame 220Y, and the armrest 240Y) can be achieved through the movable four-bar linkage structure.

[0161] Specifically, referring to Figures 19 and 20, during the folding process, when both the handrail 100Y and the third transmission member 260Y rotate counterclockwise relative to the first transmission member 230Y about the first pivot point A1, the handrail 100Y drives the second end of the first transmission member 230Y to rotate clockwise about the third pivot point A3. Simultaneously, the third transmission member 260Y rotates counterclockwise about the sixth pivot point A6, driving the armrest 240Y to rotate clockwise about the second pivot point A2, approaching the rear wheel frame 220Y for folding. Furthermore, when the third transmission member 260Y rotates about the first pivot point A1 (or the fifth pivot point A5), the third transmission member 260Y also drives the first end of the second transmission member 250Y to rotate clockwise about the fourth pivot point A4, pulling the front wheel frame 210Y gradually closer to the rear wheel frame 220Y for folding. It should be noted that in this embodiment, as shown in Figures 23, 26, and 27, when the cart handle frame 100Y is in the folded state, the second recess on the second transmission member 250Y is opposite the second locking member 410Y. When the second driving member 422Y is activated by the second return member 440Y, the second sliding sleeve 421Y is reset and separated from the second locking member 410Y. In this way, the second locking member 410Y can move to the second locking position under the elastic return force of the fifth return member, extending into the second recess to lock the cart frame 100Y, thereby preventing the cart frame 100Y from expanding.

[0162] To enhance user convenience in releasing the reversing locking mechanism 300Y and the retracting locking mechanism 400Y, in some embodiments provided herein, a release mechanism 500Y is capable of releasing the reversing locking mechanism 300Y and the retracting locking mechanism 400Y, respectively. Specifically, the release mechanism 500Y is drivably connected to the reversing locking mechanism 300Y and the retracting locking mechanism 400Y, respectively, to allow the handle frame 100Y to rotate relative to the wheel frame 200Y for reversing or retracting operations. Specifically, as shown in Figures 16 and 17 , the release mechanism 500Y is disposed on the handle frame 100Y. More specifically, it is disposed on the handle tube 120Y of the handle frame 100Y, thereby facilitating user operation. Of course, in other embodiments, the release mechanism 500Y may also be disposed on the support rod or the wheel frame 200Y, without limitation herein.

[0163] Referring to Figures 16, 21, and 28, in one embodiment, the release mechanism 500Y includes a first release member 510Y, a second release member 520Y, and an operating member 530Y. The first release member 510Y is rotatably mounted on the handlebar frame 100Y and is drivingly connected to the reversing locking mechanism 300Y, allowing the handlebar frame 100Y to rotate relative to the wheel frame 200Y for reversing direction. Specifically, the first release member 510Y is drivingly connected to the first driving member 340Y in the reversing locking mechanism 300Y. The second release member 520Y is drivingly connected to the second driving member 422Y in the retractable locking mechanism 400Y, allowing the handlebar frame 100Y to rotate relative to the wheel frame 200Y for retraction. Specifically, the second release member 520Y is rotatably mounted on the handlebar frame 100Y and is drivingly connected to the retractable locking mechanism 400Y. The operating member 530Y is movably mounted on the handlebar frame 100Y and selectively drives the first release member 510Y or the second release member 520Y to rotate. It should be noted that in other embodiments, the first release member 510Y may be drivably connected to the retractable locking mechanism 400Y, and the second release member 520Y may be drivably connected to the reversing locking mechanism 300Y, without any specific limitation herein.

[0164] Since the first release member 510Y is rotatably mounted on the handlebar frame 100Y and drivingly connected to the first drive member 340Y, the second release member 520Y is rotatably mounted on the handlebar frame 100Y and drivingly connected to the second drive member 422Y, and the operating member 530Y is movable and used to drive either the first release member 510Y or the second release member 520Y to rotate, a user can control the rotation of the first release member 510Y by driving the operating member 530Y, thereby indirectly controlling the first drive member 340Y and the first locking member 310Y in the retractable locking mechanism 400Y. When the first locking member 310Y is in the first locked position, the locking portion 311Y of the first locking member 310Y engages and locks with the locking portion 301Y of the first engaging member 320Y or the second engaging member 330Y, thereby maintaining the handlebar frame 100Y in the first or second use position. When the first locking member 310Y is in the first unlocked position, the locking portion 311Y of the first locking member 310Y disengages from the locking portion 301Y of the first engaging member 320Y or the second engaging member 330Y, releasing the lock and enabling the handle frame 100Y to freely switch between the first and second use positions. Simultaneously, the user can control the rotation of the second unlocking member 520Y by driving the operating member 530Y, thereby indirectly controlling the second drive assembly 420Y and the second locking member 410Y in the folding locking mechanism 400Y. When the second locking member 410Y is in the second locked position, the cart frame 1000Y is restricted from switching between the deployed and folded states, meaning that the cart frame 1000Y can remain in either the deployed or folded state. When the second locking member 410Y is in the second unlocked position, the cart frame 1000Y can switch between the deployed and folded states. Because the user only needs to operate the above-mentioned release mechanism 500Y to control different locking mechanisms respectively, the user's operating convenience is improved.

[0165] Referring to Figures 21 and 28 to 32 , in one embodiment, the first release member 510Y and the second release member 520Y can both be disc-shaped and rotatably mounted on the handle tube 120Y of the handle frame 100Y via a shaft or pin. Specifically, a mounting seat 140Y is provided within the handle tube 120Y, and the first release member 510Y and the second release member 520Y are rotatably mounted on the mounting seat 140Y. The first release member 510Y is provided with a first connecting portion 511Y. The first connecting portion 511Y is offset from the rotation center of the first release member 510Y, for example, in a straight line or in a non-linear arrangement, but this is not limiting. The first connecting portion 511Y is used to connect to the reversing locking mechanism 300Y. Specifically, the first connecting portion 511Y is connected to the first driving member 340Y via the first pulling member 350Y. When the operating member 530Y drives the first release member 510Y to rotate about its rotation center, the first connecting portion 511Y rotates synchronously about the rotation center of the first release member 510Y, thereby driving the first traction member 350Y to move, thereby pulling the first driving member 340Y to move, ultimately driving the first locking member 310Y to move from the first locked position to the first released position. Similarly, the second release member 520Y is provided with a second connecting portion 521Y. The second connecting portion 521Y is offset from the rotation center of the second release member 520Y, for example, in a straight line or in a non-linear arrangement, but is not limited thereto. The second connecting portion 521Y is used to connect to the retractable locking mechanism 400Y. Specifically, the second connecting portion 521Y is connected to the second driving assembly 420Y (specifically, the second driving member 422Y) via the second traction member 430Y. Therefore, when the operating member 530Y drives the second release member 520Y to rotate around its rotation center, the second connecting portion 521Y will rotate synchronously around the rotation center of the second release member 520Y, thereby driving the second traction member 430Y to move to pull the second drive component 420Y to move, and finally push or drive the second locking member 410Y to move from the second locking position to the second release position.

[0166] Specifically, in this embodiment, as shown in Figures 21 and 28 , the first pulling member 350Y and the second pulling member 430Y can both be pulling ropes, for example. More specifically, the first release member 510Y is provided with two first connecting portions 511Y, and the second release member 520Y is provided with two second connecting portions 521Y. The two first connecting portions 511Y are respectively connected to the two first pulling members 350Y, and the two second connecting portions 521Y are respectively connected to the two second pulling members 430Y. Thus, when the first release member 510Y rotates, it simultaneously releases the two reversing locking mechanisms 300Y. When the second release member 520Y rotates, it simultaneously releases the two retracting locking mechanisms 400Y.

[0167] Continuing with Figures 21, 28, and 32, in one embodiment, the release mechanism 500Y further includes a safety lock 540Y. The safety lock 540Y is movably mounted on the handlebar frame 100Y and can be switched between a first position and a second position. When the safety lock 540Y is in the first position (see Figure 22), the operating member 530Y is driven to connect with the first release member 510Y via the safety lock 540Y. When the safety lock 540Y is in the second position (see Figure 28), the operating member 530Y is driven to connect with the second release member 520Y via the safety lock 540Y. Specifically, when a user needs to release the reversing lock mechanism 300Y to change the direction of use of the handlebar frame 100Y, the safety lock 540Y can be moved to the first position. Then, operating the operating member 530Y causes the first release member 510Y to rotate. When the user needs to release the folding locking mechanism 400Y to switch the cart frame 1000Y between the expanded state and the folded state, the safety lock 540Y can be moved to the second position. In this way, the second release member 520Y can be rotated by operating the operating member 530Y.

[0168] Continuing with Figures 21 and 28 to 32, in one embodiment, the safety lock 540Y includes a first linking member 541Y, a second linking member 542Y, and a toggle member 543Y. The first linking member 541Y is drivingly connected to the first release member 510Y; the second linking member 542Y is drivingly connected to the second release member 520Y; and the toggle member 543Y is connected to the first linking member 541Y and the second linking member 542Y, respectively. The toggle member 543Y is movably disposed on the handlebar frame 100Y and can be switched between a first position and a second position to drive the first linking member 541Y and the second linking member 542Y to move along the first direction F1. Specifically, when the toggle member 543Y is in the first position, the operating member 530Y is operated to push the first linking member 541Y to move along the second direction F2 to rotate the first release member 510Y; when the toggle member 543Y is in the second position, the operating member 530Y is operated to push the second linking member 542Y to move along the second direction F2 to rotate the second release member 520Y, and the first direction F1 intersects with the second direction F2.

[0169] Referring again to Figures 21 and 28 to 32, in one embodiment, the first linking member 541Y has a first abutting portion 5411Y, and the second linking member 542Y has a second abutting portion 5421Y. The operating member 530Y includes a first driving portion 531Y and a second driving portion 532Y spaced apart from each other. When the toggle member 543Y is in the first position, the first abutting portion 5411Y aligns with the first driving portion 531Y, while the second abutting portion 5421Y is offset from the second driving portion 532Y. Thus, when the operating member 530Y moves upward in the second direction F2, the first driving portion 531Y abuts against the first abutting portion 5411Y, thereby pushing the first linking member 541Y in the second direction F2, thereby driving the first release member 510Y to rotate, ultimately releasing the reversing locking mechanism 300Y. At the same time, because the second abutting portion 5421Y is offset from the second driving portion 532Y, when the operating member 530Y moves upward in the second direction F2, the second driving portion 532Y does not contact the second abutting portion 5421Y. Consequently, the second linking member 542Y and the second release member 520Y remain stationary. This means that when the operating member 530Y is operated, it does not affect the retractable locking mechanism 400Y. Similarly, when the toggle member 543Y is in the second position, the second abutting portion 5421Y aligns with the second driving portion 532Y, and the first abutting portion 5411Y is offset from the first driving portion 531Y. Consequently, when the operating member 530Y moves upward in the second direction F2, the second driving portion 532Y abuts against the second abutting portion 5421Y, thereby pushing the second linking member 542Y to move in the second direction F2, thereby driving the second release member 520Y to rotate, ultimately releasing the retractable locking mechanism 400Y. At the same time, since the first abutment portion 5411Y and the first driving portion 531Y are offset, when the operating member 530Y moves upward along the second direction F2, the first driving portion 531Y will not contact the first abutment portion 5411Y, thereby enabling the first linking member 541Y and the first release member 510Y to remain stationary, that is, when the operating member 530Y is operated, it will not affect the retractable locking mechanism 400Y.

[0170] Referring to Figures 29 to 32 , in one embodiment, the operating member 530Y further includes a third driving portion 533Y and a fourth driving portion 534Y. The third driving portion 533Y and the fourth driving portion 534Y are spaced apart and located between the first driving portion 531Y and the second driving portion 532Y. The first linking member 541Y and the second linking member 542Y are spaced apart and form a third avoidance portion 544Y therebetween. Specifically, the first linking member 541Y further includes a third abutting portion 5412Y, and the second linking member 542Y further includes a fourth abutting portion 5422Y. When the toggle member 543Y is in the first position, the third abutting portion 5412Y abuts against the third driving portion 533Y, the first abutting portion 5411Y abuts against the first driving portion 531Y, and the fourth driving portion 534Y abuts against the third avoidance portion 544Y. Therefore, when the operating member 530Y moves upward in the second direction F2, the first driving portion 531Y can abut against the first abutting portion 5411Y, and the third abutting portion 5412Y can abut against the third driving portion 533Y, thereby simultaneously pushing the first linking member 541Y to move in the second direction F2. Simultaneously, as the operating member 530Y moves upward in the second direction F2, the fourth driving portion 534Y gradually inserts into the third avoiding portion 544Y, preventing the second linking member 542Y from being driven to move when the toggle member 543Y is in the first position. Similarly, when the toggle member 543Y is in the second position, the fourth abutting portion 5422Y abuts against the fourth driving portion 534Y, the second abutting portion 5421Y abuts against the second driving portion 532Y, and the third driving portion 533Y abuts against the third avoiding portion 544Y. Therefore, when the operating member 530Y moves upward in the second direction F2, the second driving portion 532Y can abut against the second abutting portion 5421Y, and the fourth abutting portion 5422Y can abut against the fourth driving portion 534Y, thereby simultaneously pushing the second linking member 542Y to move in the second direction F2. Simultaneously, as the operating member 530Y moves upward in the second direction F2, the third driving portion 533Y gradually inserts into the third avoiding portion 544Y, preventing the toggle member 543Y from driving the first linking member 541Y to move when the toggle member 543Y is in the second position.

[0171] In one embodiment, a first clearance portion is formed between the first abutting portion 5411Y and the third abutting portion 5412Y. A second clearance portion is formed between the second abutting portion 5421Y and the fourth abutting portion 5422Y. Specifically, when the toggle member 543Y is in the first position and the operating member 530Y is operated, the second clearance portion is used to clear the second driving member 532Y. When the toggle member 543Y is in the second position and the operating member 530Y is operated, the first clearance portion is used to clear the first driving member 531Y.

[0172] Referring to Figures 21, 28, and 29, in one embodiment, the release mechanism 500Y further includes a third reset member 550Y, which may be an elastic member such as a spring or a spring clip. The third reset member 550Y abuts between the handlebar frame 100Y (e.g., the push handle tube 120Y) and the toggle member 543Y, providing an elastic restoring force to the toggle member 543Y, thereby maintaining the toggle member 543Y in the first or second position. For example, in this embodiment, the third reset member 550Y is used to permanently maintain the toggle member 543Y in the first position. To release the reversing lock mechanism 300Y, simply operate (e.g., press or push upward) the operating member 530Y. To release the retracting lock mechanism 400Y, the toggle member 543Y must first be moved to the second position before operating the operating member 530Y. After the folding locking mechanism 400Y is released, the toggle member 543Y is released, and under the resetting action of the third resetting member 550Y, the toggle member 543Y automatically returns to the first position.

[0173] In one embodiment, one of the first linking member 541Y and the first release member 510Y has a first guide recess (not shown), and the other has a first mating protrusion (not shown). The first mating protrusion is slidably disposed within the first guide recess, and the first guide recess extends along the first direction F1. Similarly, one of the second linking member 542Y and the second release member 520Y has a second guide recess (not shown), and the other has a second mating protrusion (not shown). The second mating protrusion is slidably disposed within the second guide recess, and the second guide recess extends along the first direction F1. In this way, when the toggle member 543Y switches between the first position and the second position along the first direction F1, it can drive the first linking member 541Y and the second linking member 542Y to move left and right along the first direction F1 at the same time, so that the first release member 510Y and the second release member 520Y remain stationary; at the same time, when the first linking member 541Y moves up and down along the second direction F2, the first linking member 541Y can also drive the first release member 510Y to rotate; and when the second linking member 542Y moves up and down along the second direction F2, the second linking member 542Y can also drive the second release member 520Y to rotate.

[0174] Referring to Figures 21, 22, 28, and 32, in one embodiment, the operating member 530Y has an initial position (see Figures 21 and 32) and an unlocked position (see Figures 22 and 28) when moving in the second direction F2. When the operating member 530Y is in the initial position, the operating member 530Y can be operated to move to push the first linking member 541Y or the second linking member 542Y to move. In other words, when the operating member 530Y is in the initial position, a gap or just contact can be left between the first driving portion 531Y and the first abutting portion 5411Y, and between the third driving portion 533Y and the third abutting portion 5412Y (or between the second driving portion 532Y and the second abutting portion 5421Y, and between the fourth driving portion 534Y and the fourth abutting portion 5422Y) on the operating member 530Y. In this way, the first linking member 541Y (or the second linking member 542Y) can be pushed upward by pushing or pressing the operating member 530Y. When the operating member 530Y is in the unlocked position, the operating member 530Y pushes against the first linking member 541Y or the second linking member 542Y.

[0175] Specifically, as shown in Figures 21, 22, 28, and 32, when the toggle member 543Y is in the first position and the operating member 530Y is in the initial position, a gap may exist between the first driving portion 531Y and the first abutting portion 5411Y, and between the third driving portion 533Y and the third abutting portion 5412Y, or they may just be in contact. At this point, the operating member 530Y can be pushed or pressed upward to move to the unlocked position, pushing against the first linking member 541Y in the process, causing the first linking member 541Y to drive the first release member 510Y to rotate. When the toggle member 543Y is in the second position and the operating member 530Y is in the initial position, a gap may exist between the second driving portion 532Y and the second abutting portion 5421Y, and between the fourth driving portion 534Y and the fourth abutting portion 5422Y, or they may just be in contact. At this time, the operating member 530Y can be pushed or pressed upward to move to the unlocking position, and in the process pushes the second linking member 542Y, so that the second linking member 542Y drives the second releasing member 520Y to rotate.

[0176] Referring to Figures 21 and 29 , in one embodiment, the release mechanism 500Y further includes a fourth return member 560Y, which may be an elastic member such as a spring or a spring. The fourth return member 560Y abuts between the mounting base 140Y of the handlebar frame 100Y and the operating member 530Y, providing an elastic restoring force to the operating member 530Y, thereby maintaining the operating member 530Y in its initial position.

[0177] Referring to Figures 21 and 31 , in one embodiment, the release mechanism 500Y further includes a first fixing cover 571Y and a second fixing cover 572Y. The first fixing cover 571Y is positioned on the top of the handle tube 120Y, while the second fixing cover 572Y is positioned on the bottom of the handle tube 120Y. The second fixing cover 572Y is provided with a through-hole for the operating member 530Y to pass through. The first fixing cover 571Y and the second fixing cover 572Y are coupled and secured to the handle tube 120Y. This prevents the operating member 530Y and other components from being dislodged from the handle tube 120Y. Furthermore, enclosing the first and second fixing covers 571Y, 572Y over the first and second release members 510Y, 520Y, and safety lock 540Y simplifies and enhances the appearance of the release mechanism 500Y and the cart frame 1000Y. Specifically, as shown in Figure 21, an operating hole 5711Y is provided on the first fixed cover 571Y, and a pushing portion 5431Y is provided on the toggle member 543Y. The pushing portion 5431Y can pass through the operating hole 5711Y so that the user can hold it. The user can change the position of the toggle member 543Y by pushing the pushing portion 5431Y.

[0178] The above-mentioned cart frame 1000Y and its unlocking mechanism 500Y have the following technical effects:

[0179] The cart frame 1000Y includes a release mechanism 500Y. In the release mechanism 500Y, a first release member 510Y is rotatably disposed on the cart frame 1000Y and is drivingly connected to the reversing locking mechanism 300Y, a second release member 520Y is rotatably disposed on the cart frame 1000Y and is drivingly connected to the folding locking mechanism 400Y, and an operating member 530Y is movable and used to drive either the first release member 510Y or the second release member 520Y to rotate. The reversing locking mechanism 300Y allows the hand frame 100Y to rotate relative to the wheel frame 200Y for reversing direction, while the folding locking mechanism 400Y allows the hand frame 100Y to rotate relative to the wheel frame 200Y for folding. Therefore, the user can control the rotation of the first release member 510Y by driving the operating member 530Y, thereby indirectly controlling the reversing locking mechanism 300Y, allowing the handle frame 100Y of the cart frame 1000Y to be reversible. Simultaneously, the user can also control the rotation of the second release member 520Y by driving the operating member 530Y, thereby indirectly controlling the folding locking mechanism 400Y, allowing the cart frame 1000Y to switch between an extended and folded state. Because the user can control different locking mechanisms by simply operating the release mechanism 500Y, user convenience is enhanced.

[0180] FIG33 shows a stroller frame 1000Z according to a first embodiment of the present invention. The overall structure of stroller frame 1000Z is generally bilaterally symmetrical and can be used as a frame for a child stroller, a pet stroller, or a cargo cart. For example, in this embodiment, stroller frame 1000Z is used as a child stroller to illustrate its structure and operating principle.

[0181] Referring to Figure 33 , in one embodiment, a cart frame 1000Z may include, for example, a driver frame 100Z, a wheel frame 200Z, a wheel seat 230Z, and a release mechanism 300Z according to an embodiment of the present invention. Because the cart frame 1000Z has a symmetrical structure, the following description will primarily focus on one side of the cart frame 1000Z. While the description will focus on the driver frame 100Z, the wheel frame 200Z, the wheel seat 230Z, and the release mechanism 300Z, will also be discussed.

[0182] Referring to Figures 33 to 36 , in one embodiment, the wheel frame 200Z and the handlebar frame 100Z are pivotally connected to each other, so that the stroller frame 1000Z as a whole has a folded state (in other embodiments, the folded state may also be referred to as a collapsed state or a folded state) (see Figure 35 ) and an unfolded state (see Figure 33 ). Specifically, the handlebar frame 100Z includes an upper handlebar frame 110Z and a lower handlebar frame 120Z that are movable relative to each other, with the lower handlebar frame 120Z pivotally connected to the wheel frame 200Z at its end away from the upper handlebar frame 110Z. The wheel frame 200Z includes a front wheel frame 210Z and a rear wheel frame 220Z that are pivotally connected, wherein the lower handlebar frame 120Z, the front wheel frame 210Z, and the rear wheel frame 220Z are pivotally connected via a first pivot seat 400Z. When the stroller frame 1000Z switches from the deployed state to the folded state, the front wheel frame 210Z pivots about the first pivot seat 400Z to approach the rear wheel frame 220Z, and the lower handrail frame 120Z pivots about the first pivot seat 400Z to approach the rear wheel frame 220Z. When the stroller frame 1000Z switches from the folded state to the deployed state, the front wheel frame 210Z pivots about the first pivot seat 400Z to move away from the rear wheel frame 220Z, and the lower handrail frame 120Z pivots about the first pivot seat 400Z to move away from the rear wheel frame 220Z. Specifically, when the stroller frame 1000Z is in the deployed state, a first angle α1 is formed between the front wheel frame 210Z and the rear wheel frame 220Z, and a second angle α2 is formed between the lower handrail frame 120Z and the rear wheel frame 220Z. When the cart frame 1000Z is in the folded state, a third angle α3 is formed between the front wheel frame 210Z and the rear wheel frame 220Z, and a fourth angle α4 is formed between the lower handrail 120Z and the rear wheel frame 220Z. Here, α1>α3, and α2>α4 (see Figures 34 and 35 ). Of course, in other embodiments, the lower handrail 120Z can also be directly pivotally connected to the front wheel frame 210Z or the rear wheel frame 220Z. The specific structures of the wheel frame 200Z (including the front wheel frame 210Z and the rear wheel frame 220Z) and the handrail 100Z (including the upper handrail 110Z and the lower handrail 120Z) will be further described below.

[0183] Referring to Figure 33 , in one embodiment, the front wheel frame 210Z is, for example, U-shaped and includes left and right front rods 211Z and a front crossbar 212Z connected between the two front rods 211Z. The front crossbar 212Z extends generally along a first direction F1, which corresponds to the left-right direction. When the stroller frame 1000Z is used as a child stroller, the front crossbar 212Z can also serve as a footrest.

[0184] In one embodiment, at least one wheel seat 230Z (hereinafter referred to as a front wheel seat 230ZA) is mounted on the bottom of the front wheel frame 210Z. Specifically, in this embodiment, as shown in FIG33 , two front wheel seats 230ZA are mounted on the bottom of the front wheel frame 210Z. The two front wheel seats 230ZA are spaced apart in the left-right direction (i.e., the first direction F1). More specifically, the two front wheel seats 230ZA are fixedly mounted on the left and right ends of the front crossbar 212Z, and each front wheel seat 230ZA is used to mount a wheel 240Z (hereinafter referred to as a front wheel 240ZA). Of course, in another alternative embodiment, the front wheel frame 210Z may also have other embodiments. For example, the front wheel frame 210Z may include only two front rods 211Z, one end of the two front rods 211Z connected to form a V-shaped structure, and a front wheel seat 230ZA may be centrally mounted on the bottom of the front wheel frame 210Z. Alternatively, for example, the front wheel frame 210Z only includes two front rods 211Z that are substantially parallel to each other along the left-right direction, and the two front wheel seats 230ZA are respectively connected to the two front rods 211Z.

[0185] It should be noted that, unless otherwise expressly specified or limited, directional terms such as "left" and "right" regarding the cart frame 1000Z in various embodiments of the present invention are based on the "left" and "right" orientations of the cart frame 1000Z during normal travel. Arrows L and R in the figures schematically indicate "left" and "right." These directional terms are used solely to clarify the description of the embodiments of the present invention and are not intended to unduly limit the scope of protection of the present invention.

[0186] Continuing with FIG33 , in one embodiment, the rear wheel frame 220Z may also have a U-shaped structure, for example, including two rear rods 221Z located on either side and a rear crossbar 222Z connected between the two rear rods 221Z. The rear crossbar 222Z extends along the first direction F1. At least one wheel seat 230Z (hereinafter referred to as a rear wheel seat 230BZ) is also mounted on the bottom of the rear wheel frame 220Z. In this embodiment, two rear wheel seats 230BZ are mounted on the bottom of the rear wheel frame 220Z, spaced apart in the left-right direction (i.e., the first direction F1). More specifically, the two rear wheel seats 230BZ are respectively connected to the rear rod 221Z on the same side, and each rear wheel seat 230BZ is used to mount a wheel 240Z (hereinafter referred to as a rear wheel 240BZ). Specifically, the rear wheel seat 230BZ is connected to the rear wheel 240BZ, and the rear wheel seat 230BZ is rotatably connected to the rear wheel frame 220Z (specifically, the rear rod 221Z on the same side) via a connecting shaft. Of course, in another alternative embodiment, the rear wheel frame 220Z can have other embodiments, such as the rear wheel frame 220Z only including two rear rods 221Z, one end of the two rear rods 221Z connected to form a V-shaped structure, and a rear wheel seat 230BZ can be centrally mounted on the bottom of the rear wheel frame 220Z. Alternatively, for example, the rear wheel frame 220Z only includes two rear rods 221Z arranged parallel to each other in the left-right direction, and the two rear wheel seats 230BZ are respectively connected to the two rear rods 221Z.

[0187] Referring to Figures 33 and 34 , in one embodiment, the cart frame 1000Z further includes a wheel locking mechanism 500Z disposed between the wheel frame 200Z and the wheel seat 230Z. The wheel locking mechanism 500Z is configured to restrict or allow the wheel seat 230Z to rotate relative to the wheel frame 200Z. Specifically, in this embodiment, as shown in Figure 34 , the wheel locking mechanism 500Z is disposed between the rear wheel frame 220Z and the rear wheel seat 230BZ, and is configured to restrict or allow the rear wheel seat 230BZ to rotate relative to the rear wheel frame 220Z. When the rear wheel seat 230BZ is fixed relative to the rear wheel frame 220Z, the rear wheel 240BZ is fixed relative to the rear wheel frame 220Z, and the steering of the cart frame 1000Z is locked, allowing the cart frame 1000Z to move forward or backward in a straight line. When the rear wheel seat 230BZ is rotatable relative to the rear wheel frame 220Z, the rear wheel 240BZ can rotate relative to the rear wheel frame 220Z, so that the cart frame 1000Z can perform steering drift operations, thereby improving the flexibility of the cart frame 1000Z in movement.

[0188] Referring to FIG. 34 , in one embodiment, the wheel locking mechanism 500Z includes a first locking member 510Z and a first locking recess 520Z. The wheel seat 230Z (specifically, the rear wheel seat 230BZ) is provided with the first locking recess 520Z, i.e., the first locking recess 520Z is disposed on the wheel seat 230Z. The first locking member 510Z is movably disposed on the wheel frame 200Z (specifically, the rear wheel frame 220Z) and is adapted to lockably engage with the first locking recess 520Z. Specifically, when the first locking member 510Z extends into the first locking recess 520Z to lockably engage with the first locking recess 520Z, the wheel seat 230Z (specifically, the rear wheel seat 230BZ) is restricted from rotating relative to the wheel frame 200Z (specifically, the rear wheel frame 220Z), thereby preventing the stroller frame 1000Z from drifting or turning. When the first locking member 510Z retracts from the first locking recess 520Z to release the locked engagement with the first locking recess 520Z, the wheel seat 230Z (specifically, the rear wheel seat 230BZ) is allowed to rotate relative to the wheel frame 200Z (specifically, the rear wheel frame 220Z), thereby allowing the cart frame 1000Z to drift and steer.

[0189] Continuing with FIG34 , in one embodiment, the wheel locking mechanism 500Z further includes a second return member 530Z. The second return member 530Z abuts between the rear wheel frame 220Z and the first locking member 510Z and is configured to provide an elastic restoring force to the first locking member 510Z, thereby ensuring that the first locking member 510Z is constantly inclined to extend into the first locking recess 520Z. The second return member 530Z may be, for example, an elastic component such as a spring or a spring clip.

[0190] It should be noted that, in this embodiment, in order to further improve the steering flexibility of the cart frame 1000Z, the cart frame 1000Z is provided with two wheel locking mechanisms 500Z, one of which is provided between the rear rod 221Z and the rear wheel seat 230BZ on the same side.

[0191] 33 and 34 , in one embodiment, the upper handlebar 110Z is movable relative to the lower handlebar 120Z. For example, the upper handlebar 110Z can be slidably coupled to the lower handlebar 120Z. This allows the height of the entire handlebar 100Z relative to the ground when the stroller frame 1000Z is in the deployed state to be adjusted, making it easier for users of different heights to grip the stroller frame 1000Z, thereby improving the applicability of the stroller frame 1000Z. In one embodiment, the upper handlebar 110Z is, for example, U-shaped and includes two first support tubes 111Z and a handle tube 112Z connected between the two first support tubes 111Z. The first support tubes 111Z are straight tubes, and the handle tube 112Z is ​​U-shaped and connected between the two first support tubes 111Z, for a user to grip to push the stroller frame 1000Z. More specifically, the lower handrail frame 120Z includes, for example, two second support tubes 121Z. The upper ends of the two second support tubes 121Z are, for example, respectively slidably coupled to the lower ends of the first support tubes 111Z on the same side, and the lower ends of the two second support tubes 121Z are, for example, respectively pivotally coupled to the first pivotal seats 400Z on the same side. It should be noted that the sliding coupling of the two second support tubes 121Z to the first support tubes 111Z on the same side includes two implementations: the second support tubes 121Z are respectively coupled to the first support tubes 111Z; or the first support tubes 111Z are coupled to the second support tubes 121Z. Specifically, in this embodiment, the second support tubes 121Z are coupled to the first support tubes 111Z as an example to illustrate the coordination principle between the two. Furthermore, it should be noted that the aforementioned "height of the entire handrail frame 100Z relative to the ground" can be considered to refer to the vertical height of the handle tubes 112Z from the ground.

[0192] To ensure that the handrail 100Z is stably maintained at a desired height, that is, to prevent the upper handrail 110Z from sliding freely relative to the lower handrail 120Z, in one embodiment, as shown in FIG34 , the handrail 100Z further includes a height adjustment locking mechanism 130Z disposed between the upper handrail 110Z and the lower handrail 120Z. The height adjustment locking mechanism 130Z can restrict or allow relative movement between the upper handrail 110Z and the lower handrail 120Z. Specifically, the height adjustment locking mechanism 130Z has a locked state and a released state. When the height adjustment locking mechanism 130Z is in the locked state, the upper handrail 110Z is fixed relative to the lower handrail 120Z and cannot slide relative to each other. When the height adjustment locking mechanism 130Z is in the released state, the upper handrail 110Z can slide relative to the lower handrail 120Z.

[0193] Referring to Figure 34 , in one embodiment, the height adjustment locking mechanism 130Z includes a second locking assembly 131Z and a second locking portion 133Z. The second locking portion 133Z is disposed on the lower handrail 120Z, and the second locking assembly 131Z is movably mounted on the upper handrail 110Z and adapted to lockably engage with the second locking portion 133Z. Specifically, when the second locking assembly 131Z extends into the second locking portion 133Z to lock the upper handrail 110Z, the upper handrail 110Z is restricted from sliding relative to the lower handrail 120Z. When the second locking assembly 131Z withdraws from the second locking portion 133Z to release the engagement, the upper handrail 110Z is permitted to slide relative to the lower handrail 120Z.

[0194] In this embodiment, the second locking assembly 131Z includes a second locking member 1311Z. Specifically, the second locking member 1311Z is disposed within the upper handrail 110Z and is movable relative to the upper handrail 110Z and the lower handrail 120Z to have a locked position and a released position. More specifically, the height adjustment locking mechanism 130Z also includes a first locking portion 131, 132Z disposed on the upper handrail 110Z. When the second locking member 1311Z is in the locked position, it locks with the first locking portion 132Z and the second locking portion 133Z to restrict the upper handrail 110Z from sliding relative to the lower handrail 120Z. In this state, the height adjustment locking mechanism 130Z is locked, thereby fixing the height of the entire handrail 100Z relative to the ground. When the second locking member 1311Z is in the unlocked position, the second locking member 1311Z releases the lock on the first locking portion 132Z and the second locking portion 133Z, allowing the upper handlebar frame 110Z to slide relative to the lower handlebar frame 120Z. At this point, the height adjustment locking mechanism 130Z is in the unlocked state, allowing the overall height of the handlebar frame 100Z to be adjusted to accommodate users of different heights. It should be noted that in this embodiment, the first locking portion 132Z is ​​a slotted structure provided on the first support tube 111Z of the upper handlebar frame 110Z, and the second locking portion 133Z is a slotted structure provided on the second support tube 121Z of the lower handlebar frame 120Z. When the second locking member 1311Z is in the locked position, the second locking member 1311Z passes through the first locking portion 132Z and the second locking portion 133Z to lock with both. When the second locking member 1311Z is at the unlocking position, the second locking member 1311Z retreats from the second matching locking portion 133Z to release the locking of the second matching locking portion 133Z.

[0195] In one embodiment, multiple second locking portions 133Z are provided (e.g., two, three, or more). The multiple second locking portions 133Z are spaced apart along the sliding direction of the upper handlebar frame 110Z relative to the lower handlebar frame 120Z. Specifically, the multiple second locking portions 133Z can be considered to be spaced apart along the length of the second support tube 121Z. When the second locking member 1311Z passes through the first locking portion 132Z and engages with different second locking portions 133Z, the overall length of the handlebar frame 100Z varies accordingly, thereby varying the height of the handlebar frame 100Z relative to the ground to accommodate users of different heights. Specifically, referring to Figures 34 and 44, in this embodiment, three second locking portions 133Z are provided. The three second locking portions 133Z may be referred to as the bottom second locking portion 1331Z, the middle second locking portion 1332Z, and the top second locking portion 1333Z, respectively. Among them, the middle second locking portion 1332Z is ​​located between the bottom second locking portion 1331Z and the top second locking portion 1333Z, and the bottom second locking portion 1331Z is closer to the bottom end of the second support tube 121Z than the top second locking portion 1333Z. When the second locking piece 1311Z passes through the first locking portion 132Z and is plugged into the second locking portion 1331Z at the bottom, the length of the handle frame 100Z is L1, and the height of the handle tube 112Z from the ground is H1; when the second locking piece 1311Z passes through the first locking portion 132Z and is plugged into the second locking portion 1332Z in the middle, the length of the handle frame 100Z is L2, and the height of the handle tube 112Z from the ground is H2; when the second locking piece 1311Z passes through the first locking portion 132Z and is plugged into the second locking portion 1333Z at the top, the length of the handle frame 100Z is L3, and the height of the handle tube 112Z from the ground is H3; wherein, L1<L2<L3, H1<H2<H3.

[0196] Continuing with Figure 34 , in one embodiment, the second locking assembly 131Z further includes a driver 1312Z, which is movable relative to the upper handlebar frame 110Z and operably connected to the second locking member 1311Z. Specifically, the driver 1312Z has a locked position and an unlocked position along its travel path. When the driver 1312Z is ​​in the locked position, the driver 1312Z drives the second locking member 1311Z into the locked position. When the driver 1312Z is ​​in the unlocked position, the driver 1312Z drives the second locking member 1311Z into the unlocked position. In this way, the user can indirectly control the position of the second locking member 1311Z and, therefore, the state of the height adjustment locking mechanism 130Z by directly controlling the position of the driver 1312Z. In this embodiment, the movement direction of the driver 1312Z is ​​substantially the same as the length direction of the first support tube 111Z.

[0197] Referring again to Figure 34 , in one embodiment, the height adjustment locking mechanism 130Z further includes a support base 136Z and a guide member (not shown). Specifically, the support base 136Z is disposed on the upper handlebar frame 110Z and has a first guide portion 1361Z extending perpendicularly to the direction of movement of the driver 1312Z. A second locking member 1311Z is movably disposed on the support base 136Z, with the guide member passing through the second locking member 1311Z and extending into the first guide portion 1361Z. More specifically, the driver 1312Z is ​​provided with a second guide portion (not shown) extending obliquely relative to the direction of movement of the driver 1312Z. The guide member can extend into and slidably engage with the second guide portion. When the driver 1312Z switches between a locked position and an unlocked position, the second locking member 1311Z switches between the locked position and the unlocked position through the cooperation of the guide member with the first guide portion 1361Z and the second guide portion. It should be noted that in this embodiment, the guide member may be, for example, a latch or other component. Of course, in other embodiments, the second locking member 1311Z and the guide member may also be integrally formed, and the guide member may be considered a component of the second locking member 1311Z. For example, the guide member may be a protrusion integrally formed on the second locking member 1311Z, which is primarily used to pass through the first guide portion 1361Z and the second guide portion to guide the second locking member 1311Z between the locked position and the unlocked position. It should also be noted that in this embodiment, both the first guide portion 1361Z and the second guide portion are through-hole structures.

[0198] In one embodiment, the height adjustment locking mechanism 130Z further includes a third return member 135Z (see FIG34 ), which may be an elastic member such as a spring or a spring clip. Specifically, the third return member 135Z is a compression spring that abuts between the support seat 136Z and the driver 1312Z and is used to provide an elastic restoring force to the driver 1312Z, thereby maintaining the driver 1312Z in the locked position. This, in turn, maintains the second locking member 1311Z in the locked position.

[0199] It should be noted that in this embodiment, to improve the stability of the upper handrail 110Z when it is fixed relative to the lower handrail 120Z, the handrail 100Z includes two height adjustment locking mechanisms 130Z. Specifically, one height adjustment locking mechanism 130Z is provided between the first support tube 111Z and the second support tube 121Z on the same side.

[0200] Referring to Figures 33 to 36 , in one embodiment, the upper handlebar 110Z slides relative to the lower handlebar 120Z, allowing the handlebar 100Z to have an extended state (see Figure 33 ) and a collapsed state (in other embodiments, the collapsed state may also be referred to as a folded state, etc.) (see Figure 35 ). Specifically, the length of the handlebar 100Z in the extended state is greater than the length in the collapsed state. When the pushcart frame 1000Z transitions to the collapsed state, the handlebar 100Z can be initially placed in the collapsed state, thereby further reducing the size of the pushcart frame 1000Z in the collapsed state. In this embodiment, when the second locking member 1311Z passes through the first locking portion 132Z and locks with the second locking portion 1331Z at the bottom, the pushcart is considered to be in the extended state, and at this point, the length of the handlebar 100Z is at its shortest, L1. When the second locking member 1311Z moves away from the second locking portion 133Z to release the lock on the second locking portion 133Z, the upper handrail 110Z can slide relative to the lower handrail 120Z, allowing the handrail 100Z to switch to the folded state. When the handrail 100Z is in the folded state, the length of the handrail 100Z is L0, and L0 < L1.

[0201] Referring to Figures 34 and 36 , in one embodiment, the stroller frame 1000Z further includes a handlebar folding locking mechanism 600Z, which is disposed on the handlebar frame 100Z and is adapted to lock the handlebar frame 100Z in a folded state. Specifically, the handlebar folding locking mechanism 600Z includes a latching member 610Z and a second locking recess 620Z. The second locking recess 620Z is disposed on one of the upper handlebar frame 110Z and the lower handlebar frame 120Z, while the other handlebar frame 120Z is provided with a movable latching member 610Z. In other words, the second locking recess 620Z is disposed on one of the upper handlebar frame 110Z and the lower handlebar frame 120Z, while the latching member 610Z is movably disposed on the other handlebar frame 100Z. Thus, the latching member 610Z can be engaged or disengaged with the second locking recess 620Z to restrict or allow the handlebar frame 100Z to switch between a folded state and an extended state. Specifically, when the engaging member 610Z engages with the second locking recess 620Z, the handlebar frame 100Z is locked in the folded state. This prevents the upper handlebar frame 110Z from accidentally sliding relative to the lower handlebar frame 120Z during transport or storage of the stroller frame 1000Z, thereby preventing the overall volume of the stroller frame 1000Z from increasing, making it inconvenient to transport or store. When the engaging member 610Z disengages from the second locking recess 620Z, the handlebar frame 100Z is allowed to switch to the extended state.

[0202] Please continue to refer to Figures 34 and 36. In this embodiment, the support seat 136Z is provided with a second locking recess 620Z. The lower handrail 120Z is provided with a through hole (not shown in the figure), and the engaging member 610Z is movably inserted into the through hole so that the engaging member 610Z can engage with the second locking recess 620Z. Specifically, the handrail folding locking mechanism 600Z also includes a fixed seat 630Z and a first reset member 640, wherein the fixed seat 630Z is provided on the lower handrail 120Z, and the first reset member 640 is provided between the fixed seat 630Z and the engaging member 610Z, and is used to provide an elastic restoring force for the engaging member 610Z, so that the engaging member 610Z always has a tendency to extend into the second locking recess 620Z for engagement. The first reset member 640 can be, for example, an elastic component such as a spring or a spring. Specifically, in this embodiment, the first restoring member 640 is a compression spring, and two ends thereof abut between the engaging member 610Z and the fixing seat 630Z.

[0203] Referring to Figures 34 and 36 , in one embodiment, the support base 136Z is provided with a first inclined abutting surface 1363Z and a second inclined abutting surface 1364Z. When the handlebar frame 100Z switches from the extended state to the folded state, the first inclined abutting surface 1363Z pushes against the engaging member 610Z, guiding the engaging member 610Z into the second locking recess 620Z for engagement. The second inclined abutting surface 1364Z is formed on the sidewall of the second locking recess 620Z. When the handlebar frame 100Z switches from the folded state to the extended state, the second inclined abutting surface 1364Z pushes against the engaging member 610Z, guiding the engaging member 610Z out of the second locking recess 620Z.

[0204] 34 and 36 , the height adjustment process of the handrail 100Z and the switching process of the handrail 100Z between the extended state and the folded state are briefly described below.

[0205] Referring to FIG. 34 , in this embodiment, when the handlebar 100Z is in the extended state and the height of the handlebar 100Z relative to the ground needs to be adjusted, the user can first use the driving member 1312Z to drive the second locking member 1311Z away from the second locking portion 133Z, thereby allowing the upper handlebar 110Z to slide freely relative to the lower handlebar 120Z for height adjustment. After the height of the handlebar 100Z is adjusted to the desired level, the third restoring member 135Z drives the driving member 1312Z back to the locked position, causing the second locking member 1311Z to re-enter the first locking portion 132Z and extend into the second locking portion 133Z. In this way, the upper handlebar 110Z is restricted from sliding relative to the lower handlebar 120Z, thereby maintaining the desired height of the handlebar 100Z.

[0206] Referring to Figures 34 and 36 , when the user wishes to switch the handrail 100Z from the extended state to the folded state (from Figure 34 to Figure 36 ), the user can first use the driver 1312Z to drive the second locking member 1311Z away from the second locking portion 133Z. Subsequently, the user can push the upper handrail 110Z toward the bottom of the lower handrail 120Z (i.e., the bottom end of the second support tube 121Z), thereby reducing the overall length of the handrail 100Z and switching to the folded state. During this movement, the first abutting inclined surface 1363Z on the support seat 136Z abuts against the engaging member 610Z and, as the upper handrail 110Z moves, pushes the engaging member 610Z away from the through-hole, compressing the first restoring member 640. When the engaging member 610Z passes over the first resisting inclined surface 1363Z and faces the second locking recess 620Z, the first restoring member 640 is reset and pushes the engaging member 610Z through the through hole to extend into the second locking recess 620Z. In this way, the engaging member 610Z can be engaged with the second locking recess 620Z to limit the upper handrail 110Z from sliding relative to the lower handrail 120Z.

[0207] Continuing with Figures 34 and 36 , when the user wishes to switch the handrail 100Z from the folded state to the extended state (from Figure 36 to Figure 34 ), the user can directly pull the upper handrail 110Z to move it away from the bottom of the lower handrail 120Z. This allows the overall length of the handrail 100Z to extend, allowing the handrail 100Z to switch to the extended state. During the application of pulling force to the upper handrail 110Z, the second resisting inclined surface 1364Z resists the engaging member 610Z, causing the engaging member 610Z to gradually retreat from the second locking recess 620Z. During this process, the first return member 640 is gradually compressed. Once the engaging member 610Z is released from the second locking recess 620Z, the upper handrail 110Z is allowed to slide relative to the lower handrail 120Z, allowing the handrail 100Z to switch to the extended state.

[0208] Referring to Figures 34 and 36 , in one embodiment, an abutment member 140Z is disposed within the lower handrail 120Z. This abutment member 140Z is located approximately near the bottom end of the second support tube 121Z and is configured to abut against the support seat 136Z to limit the sliding travel of the upper handrail 110Z. When the handrail 100Z is in the folded state, the support seat 136Z abuts against the abutment member 140Z.

[0209] To enhance user convenience in releasing the wheel locking mechanism 500Z and the height adjustment locking mechanism 130Z, a release mechanism 300Z in one embodiment of the present invention is capable of releasing the wheel locking mechanism 500Z and the height adjustment locking mechanism 130Z separately. Specifically, the release mechanism 300Z is drivably connected to the wheel locking mechanism 500Z and the height adjustment locking mechanism 130Z, allowing the wheel seat 230Z to rotate relative to the wheel frame 200Z, thereby enabling the stroller frame 1000Z to achieve drift steering. It also allows the upper handrail 110Z to move relative to the lower handrail 120Z, thereby changing the height of the handrail 100Z relative to the ground. Specifically, as shown in FIG33 , the release mechanism 300Z is disposed on the handrail 100Z. More specifically, it is disposed on the handlebar 112Z of the upper handrail 110Z, making it easier for users to operate. Of course, in other embodiments, the release mechanism 300Z may also be provided on the first support tube 111Z or the lower handrail 120Z or the wheel frame 200Z, which is not specifically limited here.

[0210] Referring to Figures 34 and 37 , in one embodiment, the release mechanism 300Z includes a first release member 310Z, a second release member 320Z, and an operating member 330Z. The first release member 310Z is rotatably mounted on the handlebar frame 100Z and is drivingly connected to the wheel locking mechanism 500Z, allowing the wheel seat 230Z to rotate relative to the wheel frame 200Z for drift steering. Specifically, the first release member 310Z is drivingly connected to the first locking member 510Z in the wheel locking mechanism 500Z. The second release member 320Z is rotatably mounted on the handlebar frame 100Z and is drivingly connected to the height adjustment locking mechanism 130Z, allowing the upper handlebar frame 110Z to move relative to the lower handlebar frame 120Z. Specifically, the second release member 320Z is drivingly connected to the driving member 1312Z in the height adjustment locking mechanism 130Z. The operating member 330Z is movably mounted on the handlebar frame 100Z and selectively drives the first release member 310Z or the second release member 320Z to rotate. It should be noted that in other embodiments, the first release member 310Z may be drivably connected to the height adjustment locking mechanism 130Z, and the second release member 320Z may be drivably connected to the wheel locking mechanism 500Z, without any specific limitation herein.

[0211] Since the first release member 310Z is rotatably mounted on the handlebar frame 100Z and drivingly connected to the first locking member 510Z, the second release member 320Z is rotatably mounted on the handlebar frame 100Z and drivingly connected to the driving member 1312Z, and the operating member 330Z is movable and used to drive either the first release member 310Z or the second release member 320Z to rotate, a user can control the rotation of the first release member 310Z by driving the operating member 330Z, thereby indirectly controlling the first locking member 510Z in the wheel locking mechanism 500Z. When the first locking member 510Z is inserted into the first locking recess 520Z to lock the wheel seat 230Z, the wheel seat 230Z is restricted from rotating relative to the wheel frame 200Z, allowing the stroller frame 1000Z to travel in a straight line. When the first locking member 510Z withdraws from the first locking recess 520Z to release the engagement, the wheel seat 230Z is allowed to rotate relative to the wheel frame 200Z, enabling the cart frame 1000Z to drift and steer. Simultaneously, the user can also control the rotation of the second release member 320Z by driving the operating member 330Z, thereby indirectly controlling the second locking assembly 131Z (i.e., the driving member 1312Z and the second locking member 1311Z) in the height adjustment locking mechanism 130Z. Specifically, when the driving member 1312Z is ​​in the locked position, the second locking member 1311Z is correspondingly in the locked position. The second locking member 1311Z locks with the first locking portion 132Z and the second locking portion 133Z, thereby restricting the upper handrail 110Z from moving relative to the lower handrail 120Z. When the driving member 1312Z is ​​in the unlocked position, the second locking member 1311Z is correspondingly in the released position. The second locking member 1311Z is unlocked from the first locking portion 132Z and the second locking portion 133Z, allowing the upper handrail 110Z to move relative to the lower handrail 120Z. Because the user only needs to operate the release mechanism 300Z to control the different locking mechanisms, user convenience is improved.

[0212] Referring to Figures 37 to 40 , in one embodiment, the first release member 310Z and the second release member 320Z can both be disc-shaped and rotatably mounted on the handle tube 112Z of the handle frame 100Z via a shaft or pin. Specifically, a mounting seat 340Z is provided within the handle tube 112Z, and the first release member 310Z and the second release member 320Z are rotatably mounted on the mounting seat 340Z.

[0213] Referring to Figures 34 and 37 , in one embodiment, the first release member 310Z is provided with a first connecting portion 311Z. The first connecting portion 311Z is offset from the rotational center of the first release member 310Z, for example, in a straight line or in a non-linear arrangement, but this is not limiting. The first connecting portion 311Z is used to connect to the wheel locking mechanism 500Z. In this embodiment, the wheel locking mechanism 500Z further includes a first pulling member 540Z. The first pulling member 540Z is disposed within the wheel frame 200Z and the handlebar frame 100Z and passes through the first pivot seat 400Z and the height adjustment locking mechanism 130Z to connect between the first release member 310Z and the first locking member 510Z. Specifically, one end of the first pulling member 540Z is connected to the first release member 310Z (specifically, the first connecting portion 311Z). The other end of the first pulling member 540Z (i.e., the end distal from the first release member 310Z) passes through the height adjustment locking mechanism 130Z and the first pivot seat 400Z, and then connects to the first locking member 510Z disposed in the rear wheel frame 220Z. In this way, the first release member 310Z can be driven by the first pulling member 540Z to retract the first locking member 510Z from the first locking recess 520Z. Specifically, referring to Figures 34, 37, and 41, when the operating member 330Z drives the first release member 310Z to rotate about its rotation center, the first connecting portion 311Z synchronously rotates about the rotation center of the first release member 310Z, thereby driving the first pulling member 540Z to move, thereby pulling the first locking member 510Z to retract from the first locking recess 520Z.

[0214] As shown in Figures 34 and 37 , the second release member 320Z is similarly provided with a second connecting portion 321Z. The second connecting portion 321Z is offset from the rotational center of the second release member 320Z, for example, in a straight line or in a non-linear arrangement, but this is not limiting. The second connecting portion 321Z is used to connect to the height adjustment locking mechanism 130Z. Specifically, in this embodiment, the height adjustment locking mechanism 130Z also includes a second pulling member 137Z, which is disposed within the upper handlebar 110Z and connected between the second release member 320Z and the second locking assembly 131Z (specifically, the driving member 1312Z). Specifically, please refer to Figures 34, 37 and 42. When the operating member 330Z drives the second release member 320Z to rotate around its rotation center, the second connecting part 321Z will rotate synchronously around the rotation center of the second release member 320Z, thereby driving the second traction member 137Z to move to pull the driving member 1312Z to move, and finally driving the second locking member 1311Z to move from the locking position to the releasing position.

[0215] Specifically, in this embodiment, as shown in Figures 34 and 37 , the first pulling member 540Z and the second pulling member 137Z can both be pulling ropes, for example. More specifically, the first release member 310Z is provided with two first connecting portions 311Z, and the second release member 320Z is provided with two second connecting portions 321Z. The two first connecting portions 311Z are respectively connected to the two first pulling members 540Z, and the two second connecting portions 321Z are respectively connected to the two second pulling members 137Z. Thus, when the first release member 310Z rotates, both wheel locking mechanisms 500Z are simultaneously released. When the second release member 320Z rotates, both height adjustment locking mechanisms 130Z are simultaneously released.

[0216] Referring to Figures 34, 36, and 37, in this embodiment, the support base 136Z is provided with a first through-channel 1365Z and a second through-channel 1366Z. The first through-channel 1365Z is used to accommodate the first pulling member 540Z, while the second through-channel 1366Z is used to accommodate the second pulling member 137Z. This prevents the first pulling member 540Z from becoming entangled with other components when passing through the height adjustment locking mechanism 130Z. Specifically, the first through-channel 1365Z is generally U-shaped. The other end of the first pulling member 540Z (i.e., the end distal from the first release member 310Z) extends from one end of the U-shaped channel into the support base 136Z, then extends from the other end of the U-shaped channel, surrounding the support base 136Z and extending into the first pivot base 400Z. The first pulling member 540Z is looped within the support base 136Z. This prevents the first pulling member 540Z from becoming tangled within the height adjustment locking mechanism 130Z after the handlebar frame 100Z is lowered. Specifically, the second through-hole 1366Z can be a generally linear channel. When one end of the second pulling member 137Z rotates with the second release member 320Z, the linear channel allows the other end of the second pulling member 137Z to rapidly operate, thereby driving the driving member 1312Z to move.

[0217] Referring to Figures 37 to 40 , in one embodiment, the release mechanism 300Z further includes a safety lock 350Z. The safety lock 350Z is movably mounted on the handlebar frame 100Z and can be switched between a first position and a second position. When the safety lock 350Z is in the first position (see Figure 41 ), the operating member 330Z is drivenly connected to the first release member 310Z via the safety lock 350Z. When the safety lock 350Z is in the second position (see Figure 42 ), the operating member 330Z is drivenly connected to the second release member 320Z via the safety lock 350Z. Specifically, as shown in Figures 34 and 41 , when a user desires to release the wheel locking mechanism 500Z to enable the stroller frame 1000Z to achieve drift steering, the safety lock 350Z can be moved to the first position. This allows the operating member 330Z to rotate the first release member 310Z. As shown in FIG34 and FIG42 , when the user needs to release the height adjustment locking mechanism 130Z to adjust the height of the handrail 100Z or switch the handrail 100Z to the folded state, the safety lock 350Z can be moved to the second position. In this way, the second release member 320Z can be rotated by operating the operating member 330Z.

[0218] Continuing with Figures 37 to 40 , in one embodiment, the safety lock 350Z includes a first linking member 351Z, a second linking member 352Z, and a toggle member 353Z. The first linking member 351Z is drivingly connected to the first release member 310Z; the second linking member 352Z is ​​drivingly connected to the second release member 320Z; and the toggle member 353Z is connected to the first linking member 351Z and the second linking member 352Z, respectively. The toggle member 353Z is movably disposed on the handlebar frame 100Z and can be switched between a first position and a second position to drive the first linking member 351Z and the second linking member 352Z to move along the first direction F1. Specifically, when the toggle member 353Z is in the first position, the operating member 330Z is operated to push the first linking member 351Z to move along the second direction F2 to rotate the first release member 310Z; when the toggle member 353Z is in the second position, the operating member 330Z is operated to push the second linking member 352Z to move along the second direction F2 to rotate the second release member 320Z, and the first direction F1 intersects with the second direction F2.

[0219] Referring to Figures 34 and 41 to 43, in one embodiment, the first linking member 351Z has a first abutting portion 3511Z, and the second linking member 352Z has a second abutting portion 3521Z. The operating member 330Z has a first driving portion 331Z and a second driving portion 332Z spaced apart from each other. When the toggle member 353Z is in the first position, the first abutting portion 3511Z aligns with the first driving portion 331Z, while the second abutting portion 3521Z is offset from the second driving portion 332Z. Thus, when the operating member 330Z moves upward in the second direction F2, the first driving portion 331Z abuts against the first abutting portion 3511Z, thereby pushing the first linking member 351Z in the second direction F2, thereby driving the first release member 310Z to rotate, ultimately releasing the wheel locking mechanism 500Z. At the same time, because the second abutting portion 3521Z is offset from the second driving portion 332Z, when the operating member 330Z moves upward in the second direction F2, the second driving portion 332Z does not contact the second abutting portion 3521Z. Consequently, the second linking member 352Z and the second release member 320Z remain stationary. This means that when the operating member 330Z is operated, it does not affect the height adjustment locking mechanism 130Z. Similarly, when the toggle member 353Z is in the second position, the second abutting portion 3521Z aligns with the second driving portion 332Z, and the first abutting portion 3511Z is offset from the first driving portion 331Z. Thus, when the operating member 330Z moves upward in the second direction F2, the second driving portion 332Z abuts against the second abutting portion 3521Z, thereby pushing the second linking member 352Z to move in the second direction F2, thereby driving the second release member 320Z to rotate, ultimately releasing the height adjustment locking mechanism 130Z. At the same time, since the first abutment portion 3511Z and the first driving portion 331Z are offset, when the operating member 330Z moves upward along the second direction F2, the first driving portion 331Z will not contact the first abutment portion 3511Z, thereby enabling the first linking member 351Z and the first release member 310Z to remain stationary, that is, when the operating member 330Z is operated, it will not affect the wheel locking mechanism 500Z.

[0220] Referring to Figure 43, in one embodiment, the operating member 330Z further includes a third driving portion 333Z and a fourth driving portion 334Z. The third driving portion 333Z and the fourth driving portion 334Z are spaced apart and located between the first driving portion 331Z and the second driving portion 332Z. The first linking member 351Z and the second linking member 352Z are spaced apart and form a third avoidance portion 354Z therebetween. Specifically, the first linking member 351Z further includes a third abutting portion 3512Z, and the second linking member 352Z further includes a fourth abutting portion 3522Z. When the toggle member 353Z is in the first position, the third abutting portion 3512Z faces the third driving portion 333Z, the first abutting portion 3511Z faces the first driving portion 331Z, and the fourth driving portion 334Z faces the third avoidance portion 354Z. Therefore, when the operating member 330Z moves upward in the second direction F2, the first driving portion 331Z can abut against the first abutting portion 3511Z, and the third abutting portion 3512Z can abut against the third driving portion 333Z, thereby simultaneously pushing the first linking member 351Z to move in the second direction F2. Simultaneously, as the operating member 330Z moves upward in the second direction F2, the fourth driving portion 334Z gradually inserts into the third avoiding portion 354Z, preventing the second linking member 352Z from moving when the toggle member 353Z is in the first position. Similarly, when the toggle member 353Z is in the second position, the fourth abutting portion 3522Z abuts against the fourth driving portion 334Z, the second abutting portion 3521Z abuts against the second driving portion 332Z, and the third driving portion 333Z abuts against the third avoiding portion 354Z. Therefore, when the operating member 330Z moves upward in the second direction F2, the second driving portion 332Z can abut against the second abutting portion 3521Z, and the fourth abutting portion 3522Z can abut against the fourth driving portion 334Z, thereby simultaneously pushing the second linking member 352Z to move in the second direction F2. At the same time, as the operating member 330Z moves upward in the second direction F2, the third driving portion 333Z gradually inserts into the third avoiding portion 354Z, preventing the toggle member 353Z from driving the first linking member 351Z to move when the toggle member 353Z is in the second position.

[0221] In one embodiment, as shown in Figure 43, a first clearance portion is formed between the first abutting portion 3511Z and the third abutting portion 3512Z. A second clearance portion is formed between the second abutting portion 3521Z and the fourth abutting portion 3522Z. Specifically, when the toggle member 353Z is in the first position and the operating member 330Z is operated, the second clearance portion is used to avoid the second driving portion 332Z. When the toggle member 353Z is in the second position and the operating member 330Z is operated, the first clearance portion is used to avoid the first driving portion 331Z.

[0222] Referring to Figures 34, 37, and 38, in one embodiment, the release mechanism 300Z further includes a fourth reset member 360Z, which may be an elastic member such as a spring or a spring clip. The fourth reset member 360Z abuts between the handlebar 100Z (e.g., the push handle tube 112Z) and the toggle member 353Z, providing an elastic restoring force to the toggle member 353Z, thereby maintaining the toggle member 353Z in the first or second position. For example, in this embodiment, the fourth reset member 360Z is used to permanently maintain the toggle member 353Z in the first position. To release the wheel locking mechanism 500Z, simply operate (e.g., press or push upward) the operating member 330Z. To release the height adjustment locking mechanism 130Z, first move the toggle member 353Z to the second position before operating the operating member 330Z. After the height adjustment locking mechanism 130Z is unlocked, the toggle member 353Z is released, and under the resetting action of the fourth resetting member 360Z, the toggle member 353Z is automatically reset to the second position.

[0223] In one embodiment, one of the first linking member 351Z and the first release member 310Z has a first guide recess (not shown), and the other has a first mating protrusion (not shown). The first mating protrusion is slidably disposed within the first guide recess, and the first guide recess extends along the first direction F1. Similarly, one of the second linking member 352Z and the second release member 320Z has a second guide recess (not shown), and the other has a second mating protrusion (not shown). The second mating protrusion is slidably disposed within the second guide recess, and the second guide recess extends along the first direction F1. In this way, when the toggle member 353Z switches between the first position and the second position along the first direction F1, it can drive the first linking member 351Z and the second linking member 352Z to move left and right along the first direction F1 at the same time, so that the first release member 310Z and the second release member 320Z remain stationary; at the same time, when the first linking member 351Z moves up and down along the second direction F2, the first linking member 351Z can also drive the first release member 310Z to rotate; and when the second linking member 352Z moves up and down along the second direction F2, the second linking member 352Z can also drive the second release member 320Z to rotate.

[0224] In one embodiment, the operating member 330Z has an initial position (see FIG. 37 ) and an unlocked position (see FIG. 41 and FIG. 42 ) when moving in the second direction F2. When the operating member 330Z is in the initial position, the operating member 330Z can be operated to move to push the first linking member 351Z or the second linking member 352Z to move. In other words, when the operating member 330Z is in the initial position, a gap may be left between the first driving portion 331Z and the first abutting portion 3511Z, and between the third driving portion 333Z and the third abutting portion 3512Z (or between the second driving portion 332Z and the second abutting portion 3521Z, and between the fourth driving portion 334Z and the fourth abutting portion 3522Z) on the operating member 330Z, or they may just be in contact. In this way, the first linking member 351Z (or the second linking member 352Z) can be pushed upward by pushing or pressing the operating member 330Z upward. When the operating member 330Z is located at the unlocking position, the operating member 330Z pushes the first linking member 351Z or the second linking member 352Z.

[0225] Specifically, as shown in Figures 37 and 41 to 43, when the toggle member 353Z is in the first position and the operating member 330Z is in the initial position, a gap may exist between the first driving portion 331Z and the first abutting portion 3511Z, and between the third driving portion 333Z and the third abutting portion 3512Z, or they may just be in contact. At this point, the operating member 330Z can be pushed or pressed upward to move to the unlocked position, pushing against the first linking member 351Z in the process, causing the first linking member 351Z to drive the first release member 310Z to rotate. When the toggle member 353Z is in the second position and the operating member 330Z is in the initial position, a gap may exist between the second driving portion 332Z and the second abutting portion 3521Z, and between the fourth driving portion 334Z and the fourth abutting portion 3522Z, or they may just be in contact. At this time, the operating member 330Z can be pushed or pressed upward to move to the unlocking position, and in the process, pushes the second linking member 352Z, so that the second linking member 352Z drives the second release member 320Z to rotate.

[0226] In one embodiment, as shown in Figures 37 and 39 , the release mechanism 300Z further includes a fifth return member 370Z, which can be an elastic member such as a spring or a spring. The fifth return member 370Z abuts between the mounting base 340Z of the handlebar frame 100Z and the operating member 330Z, providing an elastic restoring force to the operating member 330Z, thereby maintaining the operating member 330Z in its initial position.

[0227] Referring to Figures 33 and 40 to 42, in one embodiment, the release mechanism 300Z further includes a first fixed cover 381Z and a second fixed cover 382Z. The first fixed cover 381Z and the second fixed cover 382Z are disposed on the upper and lower sides of the push handle tube 112Z. The first fixed cover 381Z is located at the top of the push handle tube 112Z, while the second fixed cover 382Z is ​​located at the bottom of the push handle tube 112Z. The second fixed cover 382Z is ​​provided with a through hole for the operating member 330Z to pass through. The first fixed cover 381Z and the second fixed cover 382Z are connected and engaged with each other and fixed to the push handle tube 112Z. This allows the operating member 330Z and other components to be limited in position, preventing the operating member 330Z and other components from being separated from the push handle tube 112Z. Furthermore, enclosing the first and second fixing covers 381Z and 382Z over the first and second release members 310Z, 320Z, and safety lock 350Z further simplifies and enhances the release mechanism 300Z and the stroller frame 1000Z. Specifically, as shown in Figures 41 and 42 , the first fixing cover 381Z defines an operating hole 3811Z, and the toggle member 353Z defines a push portion 3531Z. This push portion 3531Z can be inserted through the operating hole 3811Z for easy gripping by the user, allowing the user to adjust the position of the toggle member 353Z by pushing the push portion 3531Z. Of course, in other embodiments, as shown in Figure 44, the first fixed cover 381Z and the second fixed cover 382Z are arranged on the front and rear sides of the push handle tube 112Z, wherein the first fixed cover 381Z is located on the rear side of the push handle tube 112Z, and the second fixed cover 382Z is ​​located on the front side of the push handle tube 112Z, and the first fixed cover 381Z and the second fixed cover 382Z are enclosed and jointly form a through hole for the operating part 330Z to pass through, and the first fixed cover 381Z is provided with an operating hole 3811Z.

[0228] Figure 45 shows a partial perspective view of a cart frame 1000Z according to a second embodiment of the present invention. This cart frame 1000Z is similar to the first embodiment described above, and includes components such as a handlebar frame 100Z, a wheel frame 200Z, a wheel seat 230Z, and a release mechanism 300Z. The cart frame 1000Z of this embodiment is a variation of the cart frame 1000Z of the first embodiment described above. Unless otherwise specified, the structure and inter-component connections of this embodiment can be found in the description of the first embodiment above. The following primarily describes the differences between this embodiment and the first embodiment described above.

[0229] In this embodiment, "the upper handrail 110Z moves relative to the lower handrail 120Z" means that the upper handrail 110Z can rotate relative to the lower handrail 120Z. The upper handrail 110Z and the lower handrail 120Z are restricted or permitted to rotate relative to each other by a height adjustment locking mechanism 130Z. Specifically, in one embodiment, as shown in Figures 45 to 47, the height adjustment locking mechanism 130Z includes a first connecting seat 138Z, a second connecting seat 139Z, and a second locking member 1311Z. The first connecting seat 138Z is connected to the upper handrail 110Z, the second connecting seat 139Z is connected to the lower handrail 120Z and pivotally connected to the first connecting seat 138Z, and the second locking member 1311Z is axially movable between the first connecting seat 138Z and the second connecting seat 139Z to restrict or permit relative pivoting of the first connecting seat 138Z and the second connecting seat 139Z, thereby restricting or permitting rotation of the upper handrail 110Z relative to the lower handrail. When the upper handrail 110Z rotates relative to the lower handrail 120Z about the height adjustment locking mechanism 130Z, the height of the upper handrail 110Z (specifically, the handle tube 112Z) relative to the ground can be changed (see FIG46 ). This allows users of different heights to grip the handle tube 112Z. It should be noted that in this embodiment, to clearly illustrate the position of the upper handrail 110Z after rotation relative to the lower handrail 120Z, FIG46 uses dotted lines to indicate the different positions of the upper handrail 110Z after rotation relative to the lower handrail 120Z.

[0230] In conjunction with Figures 47 to 49, in this embodiment, a first chamber 1381Z is provided on the side of the first connecting base 138Z facing the second connecting base 139Z, and a first locking groove 1382Z is ​​provided on the sidewall of the first chamber 1381Z. A second chamber 1391Z is provided on the side of the second connecting base 139Z facing the first connecting base 138Z, and a second locking groove (not shown) is provided on the sidewall of the second chamber 1391Z. A second locking member 1311Z is provided with a locking tooth 13111Z and has a locked position and a released position. Specifically, when the second locking member 1311Z is in the locked position, the locking tooth 13111Z simultaneously engages the first locking groove 1382Z and the second locking groove, thereby limiting the first connecting base 138Z from pivoting relative to the second connecting base 139Z. When the second locking member 1311Z is in the unlocking position, the locking tooth 13111Z withdraws from the first locking groove 1382Z or the second locking groove, thereby allowing the first connecting seat 138Z to pivot relative to the second connecting seat 139Z.

[0231] Continuing with Figures 47 to 49, in this embodiment, the height adjustment locking mechanism 130Z further includes a driving member 1312Z, which is movably disposed on a side of the first connecting seat 138Z facing away from the second connecting seat 139Z. The driving member 1312Z axially passes through the first connecting seat 138Z and abuts against the second locking member 1311Z to drive the second locking member 1311Z to move, thereby allowing the second locking member 1311Z to withdraw from the first locking groove 1382Z. Specifically, referring to Figures 42 and 47 to 49, the height adjustment locking mechanism 130Z further includes a second pulling member 137Z, which is connected between the driving member 1312Z and the second release member 320Z. When the height of the handlebar frame 100Z needs to be adjusted, the operating member 330Z can be operated to rotate the second release member 320Z. In this way, the driving member 1312Z is ​​driven to move under the transmission action of the second pulling member 137Z, thereby pushing the second locking member 1311Z to completely retract into the second chamber 1391Z. Of course, in other embodiments, the driving member 1312Z can also be movably disposed on the side of the second connecting seat 139Z facing away from the first connecting seat 138Z, and the driving member 1312Z can axially pass through the second connecting seat 139Z and abut against the second locking member 1311Z to drive the second locking member 1311Z to move, thereby allowing the second locking member 1311Z to withdraw from the second locking groove. When the height of the handlebar frame 100Z needs to be adjusted, the operating member 330Z can be operated to drive the second release member 320Z to rotate. In this way, under the transmission action of the second traction member 137Z, the next driving member 1312Z moves to push the second locking member 1311Z to completely retract into the first chamber 1381Z.

[0232] It should be noted that, in this embodiment, the third return member 135Z is axially abutted between the second locking member 1311Z and the second connecting seat 139Z and is used to maintain the second locking member 1311Z in the locked position. Furthermore, it should be noted that, in this embodiment, when the height of the handlebar frame 100Z needs to be adjusted, the user can also directly operate (e.g., press) the driving member 1312Z to push against the second locking member 1311Z without operating the operating member 330Z.

[0233] In this embodiment, the first pulling member 540Z can be directly disposed between the first connecting seat 138Z and the second connecting seat 139Z to extend into the wheel frame 200Z through the height adjustment locking mechanism 130Z. Of course, in other embodiments, as shown in Figure 50, the height adjustment locking mechanism 130Z can also include a cover 1341Z. The cover 1341Z can be connected to the first connecting seat 138Z or the second connecting seat 139Z, and a through-space 1342Z can be formed between the cover 1341Z and the first connecting seat 138Z or the second connecting seat 139Z. The first pulling member 540Z is disposed in the through-space 1342Z. Specifically, when the driving member 1312Z is ​​movably disposed on the side of the first connecting seat 138Z facing away from the second connecting seat 139Z, the cover 1341Z is disposed on the side of the second connecting seat 139Z facing away from the first connecting seat 138Z, forming the through-space 1342Z between the cover 1341Z and the second connecting seat 139Z. When the driving member 1312Z is ​​movably arranged on the side of the second connecting seat 139Z facing away from the first connecting seat 138Z, the cover body 1341Z is arranged on the side of the first connecting seat 138Z facing away from the second connecting seat 139Z and forms a through space 1342Z between the cover body 1341Z and the first connecting seat 138Z.

[0234] The above-mentioned cart frame 1000Z and its unlocking mechanism 300Z have the following technical effects:

[0235] The stroller frame 1000Z includes a release mechanism 300Z. In the release mechanism 300Z, a first release member 310Z is rotatably disposed on the stroller frame 1000Z and is drivingly connected to the wheel locking mechanism 500Z, a second release member 320Z is rotatably disposed on the stroller frame 1000Z and is drivingly connected to the height adjustment locking mechanism 130Z, and an operating member 330Z is movable and used to drive either the first release member 310Z or the second release member 320Z to rotate. The wheel locking mechanism 500Z allows the wheel 240Z to rotate relative to the rear wheel frame 220Z along with the wheel seat 230Z for drifting and steering, and the height adjustment locking mechanism 130Z allows the upper handrail 110Z to move relative to the lower handrail 120Z. Therefore, the user can control the rotation of the first release member 310Z by driving the operating member 330Z, thereby indirectly controlling the wheel locking mechanism 500Z, enabling the stroller frame 1000Z to achieve drift steering. Simultaneously, the user can also control the rotation of the second release member 320Z by driving the operating member 330Z, thereby indirectly controlling the height adjustment locking mechanism 130Z, allowing the overall height of the handlebar frame 100Z to be adjusted. Because the user can control different locking mechanisms by simply operating the release mechanism 300Z, user convenience is enhanced.

[0236] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0237] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A unlocking mechanism, applicable to a cart frame, the cart frame including an upper handle frame, a lower handle frame, a wheel frame, a height adjustment locking mechanism and a folding locking mechanism, the upper handle frame and the lower handle frame restricting or allowing relative movement therebetween through the height adjustment locking mechanism, the lower handle frame being pivotally connected to the wheel frame and restricting or allowing relative pivoting therebetween through the folding locking mechanism, characterized in that, The unlocking mechanism includes: A first unlocking member rotatably disposed on the stroller frame, the first unlocking member being drivingly connected to the folding and locking mechanism to allow the lower handrail to pivot relative to the wheel frame; A second unlocking member rotatably disposed on the stroller frame, the second unlocking member being drivingly connected to the height adjustment locking mechanism to allow the upper handrail to move relative to the lower handrail; and An operating member movably disposed on the stroller frame and adapted to drive either the first unlocking member or the second unlocking member to rotate.

2. A unlocking mechanism, applicable to a trolley frame, the trolley frame comprising a handrail frame, a wheel frame, a reversing locking mechanism and a folding locking mechanism, the handrail frame being rotatably arranged on the wheel frame, the reversing locking mechanism and the folding locking mechanism both being arranged between the handrail frame and the wheel frame, the handrail frame being capable of being restricted or allowed to rotate relative to the wheel frame by the reversing locking mechanism for reversing, and the handrail frame being further capable of being restricted or allowed to rotate relative to the wheel frame by the folding locking mechanism for folding, characterized in that, The unlocking mechanism includes: A first unlocking member rotatably disposed on the stroller frame and drivingly connected to the reversing locking mechanism to allow the handrail to rotate relative to the wheel frame for reversing; A second unlocking member rotatably disposed on the stroller frame and drivingly connected to the folding and locking mechanism to allow the handrail to rotate relative to the wheel frame for folding; and An operating member movably disposed on the stroller frame and selectively driving the first unlocking member or the second unlocking member to rotate.

3. The unlocking mechanism according to claim 1 or 2, characterized in that The unlocking mechanism further includes a safety lock movably disposed on the stroller frame and switchable between a first position and a second position; when the safety lock is in the first position, the operating member is drivingly connected to the first unlocking member through the safety lock; when the safety lock is in the second position, the operating member is drivingly connected to the second unlocking member through the safety lock.

4. The unlocking mechanism according to claim 3, characterized in that, The safety lock includes: A toggling member movably disposed on the stroller frame in a first direction and switchable between the first position and the second position; A first linkage member movably connected to the toggling member in a second direction and drivingly connected to the first unlocking member; and A second linkage member movably connected to the toggling member in the second direction and drivingly connected to the second unlocking member; wherein the first direction intersects the second direction, and the operating member is movable relative to the stroller frame in the second direction; when the toggling member is in the first position, the operating member can be operated to push the first linkage member to move and rotate the first unlocking member; when the toggling member is in the second position, the operating member can be operated to push the second linkage member to move and rotate the second unlocking member.

5. The unlocking mechanism according to claim 4, wherein the first linkage member has a first abutting portion, the second linkage member has a second abutting portion, and the operating member has a first driving portion and a second driving portion disposed at intervals; when the toggling member is in the first position, the first abutting portion is aligned with the first driving portion, and the second abutting portion is misaligned with the second driving portion; when the toggling member is in the second position, the second abutting portion is aligned with the second driving portion, and the first abutting portion is misaligned with the first driving portion.

6. The unlocking mechanism according to claim 5, wherein The operating member further has a third driving part and a fourth driving part, the third driving part and the fourth driving part are arranged at intervals and are located between the first driving part and the second driving part; The first linkage member and the second linkage member are arranged at intervals, and a third avoidance part is formed therebetween. The first linkage member further has a third abutting part, and the second linkage member further has a fourth abutting part; When the toggling member is in the first position, the third abutting part is opposite to the third driving part, and the fourth driving part is opposite to the third avoidance part; when the toggling member is in the second position, the fourth abutting part is opposite to the fourth driving part, and the third driving part is opposite to the third avoidance part.

7. The unlocking mechanism according to claim 6, wherein A first avoidance part is formed between the first abutting part and the third abutting part; a second avoidance part is formed between the second abutting part and the fourth abutting part; When the toggling member is in the first position and the operating member is operated, the second avoidance part is used to avoid the second driving part; when the toggling member is in the second position and the operating member is operated, the first avoidance part is used to avoid the first driving part.

8. The unlocking mechanism according to claim 4, wherein One of the first linkage member and the first unlocking member has a first guiding concave part, and the other has a first mating convex part. The first mating convex part is slidably arranged in the first guiding concave part, and the first guiding concave part extends along the first direction; One of the second linkage member and the second unlocking member has a second guiding concave part, and the other has a second mating convex part. The second mating convex part is slidably arranged in the second guiding concave part, and the second guiding concave part extends along the first direction.

9. The unlocking mechanism according to claim 4, wherein The operating member has an initial position and an unlocking position; when the operating member is in the initial position, the operating member can be operated to move so as to push the first linkage member or the second linkage member to move; when the operating member is in the unlocking position, the operating member pushes the first linkage member or the second linkage member.

10. The unlocking mechanism according to claim 1, wherein A first connecting part is provided on the first unlocking member, the first connecting part is arranged offset from the rotation center of the first unlocking member, and the first connecting part is used to connect the folding and locking mechanism; a second connecting part is provided on the second unlocking member, the second connecting part is arranged offset from the rotation center of the second unlocking member, and the second connecting part is used to connect the height adjustment locking mechanism.

11. A trolley frame, characterized in that, Comprising an upper frame, a lower frame, a wheel frame, a folding and locking mechanism, a height adjustment locking mechanism, and the unlocking mechanism described in claim 1, the upper frame and the lower frame restrict or allow relative movement therebetween through the height adjustment locking mechanism, the lower frame is pivotally connected to the wheel frame and restricts or allows relative pivoting therebetween through the folding and locking mechanism, and the unlocking mechanism is disposed on the frame or the wheel frame and is respectively drivingly connected to the folding and locking mechanism and the height adjustment locking mechanism to allow the lower frame to pivot relative to the wheel frame and the upper frame to move relative to the lower frame.

12. The trolley frame according to claim 11, wherein, The folding and locking mechanism includes a first locking member and a fixing member, the fixing member is provided with a locking recess and is mounted on one of the wheel frame or the lower frame, and the first locking member is movably disposed on the other of the wheel frame or the lower frame and is operably connected to the first unlocking member; When the first locking member is inserted into the locking recess, the lower frame is restricted from pivoting relative to the wheel frame, and when the first locking member withdraws from the locking recess, the lower frame can pivot relative to the wheel frame.

13. The cart frame according to claim 12, characterized in that, The folding and locking mechanism further includes a first traction member, the first traction member is connected between the first unlocking member and the first locking member, and the first unlocking member drives the first locking member to withdraw from the locking recess through the first traction member.

14. The cart frame according to claim 11, characterized in that, The height adjustment locking mechanism includes a frame locking assembly and a locking hole, one of the upper frame and the lower frame is provided with the locking hole, and the other is provided with the frame locking assembly, and the frame locking assembly can be engaged with the locking hole to lock the upper frame and the lower frame.

15. The trolley frame according to claim 14, characterized in that, The frame locking assembly is disposed on the upper frame, and the frame locking assembly includes: A moving member, movably disposed on the upper frame and operably connected to the second unlocking member, the moving member is provided with a guiding groove, and the guiding groove extends obliquely with respect to the moving direction of the moving member; and A second locking member, having a guiding post, the guiding post extends into the guiding groove and is slidably engaged with the guiding groove to be able to extend into or withdraw from the locking hole.

16. According to the unlocking mechanism described in claim 2, wherein The first unlocking member is provided with a first connecting portion, the first connecting portion is disposed offset from the rotation center of the first unlocking member, and the first connecting portion is used for connecting the reversing locking mechanism; The second unlocking member is provided with a second connecting portion, the second connecting portion is disposed offset from the rotation center of the second unlocking member, and the second connecting portion is used for connecting the folding and locking mechanism.

17. A trolley frame has a deployed state and a folded state, characterized in that, Comprising: A wheel frame; A frame, rotatably disposed on the wheel frame; A reversing locking mechanism, disposed between the frame and the wheel frame, and the frame can restrict or allow rotation relative to the wheel frame through the reversing locking mechanism to reverse; A folding and locking mechanism, disposed between the frame and the wheel frame, and the frame can restrict or allow rotation relative to the wheel frame through the folding and locking mechanism to fold; And The unlocking mechanism according to claim 2 is disposed on the vehicle frame and is respectively drivingly connected to the folding and locking mechanism and the unlocking mechanism to allow the vehicle frame to rotate relative to the wheel frame for commutation or folding.

18. The stroller frame according to claim 17, wherein the vehicle frame is pivotally connected to the wheel frame at a first pivot point, so that the vehicle frame has a first use position and a second use position relative to the wheel frame; the commutation locking mechanism includes a first locking member, a first engaging member and a second engaging member. The first engaging member and the second engaging member are circumferentially spaced apart on the wheel frame around the first pivot point. The first locking member is disposed on the vehicle frame and is adapted to engage with the first engaging member or the second engaging member. When the first locking member engages with the first engaging member, the vehicle frame is in the first use position. When the first locking member engages with the second engaging member, the vehicle frame is in the second use position.

19. The stroller frame according to claim 18, wherein the first locking member has a locking portion, and the first engaging member and the second engaging member are both provided with a locking portion adapted to engage with the locking portion; the first locking member is movably disposed on the vehicle frame and has a first locking position and a first unlocking position. When in the first locking position, the locking portion engages with the locking portion to limit the switching of the vehicle frame between the first use position and the second use position. When in the first unlocking position, the locking portion disengages from the locking portion to allow the vehicle frame to switch between the first use position and the second use position.

20. The stroller frame according to claim 17, wherein the vehicle frame is pivotally connected to the wheel frame at a first pivot point, so that the vehicle frame has a first use position and a third use position relative to the wheel frame; when the vehicle frame is in the first use position, the vehicle frame is away from the wheel frame around the first pivot point, so that the stroller frame is in the unfolded state. When the vehicle frame is in the third use position, the vehicle frame is close to the wheel frame around the first pivot point, so that the stroller frame is in the folded state.

21. The cart frame according to claim 20, wherein, The folding and locking mechanism includes: a second locking member, which is movable relative to the vehicle frame and has a second locking position and a second unlocking position; the wheel frame includes a rear wheel frame and a first transmission member. One end of the first transmission member is pivotally connected to the rear wheel frame, and the other end is pivotally connected to the vehicle frame at the first pivot point; When the second locking member is in the second locking position, the second locking member engages with the first transmission member to restrict the pivot of the rider frame relative to the first transmission member, thereby restricting the switching of the rider frame between the first use position and the third use position; when the second locking member is in the second unlocking position, the second locking member disengages from the first transmission member to allow the pivot of the rider frame relative to the first transmission member, thereby allowing the switching of the rider frame between the first use position and the third use position.

22. The trolley frame according to claim 21, characterized in that, The folding locking mechanism further includes: A second driving assembly movably disposed on the rider frame and drivingly engaged with the second locking member; and A second traction member respectively connected to the second driving assembly and the second unlocking member; When the second unlocking member rotates, the second unlocking member drives the second driving assembly to move through the second traction member, so as to drive the second locking member to move from the second locking position to the second unlocking position.

23. A unlocking mechanism is applicable to a trolley frame. The trolley frame includes a handle frame, a wheel frame, a wheel seat and a wheel locking mechanism. The handle frame includes an upper handle frame, a lower handle frame and a height adjustment locking mechanism disposed therebetween. The upper handle frame and the lower handle frame are restricted or allowed to move relative to each other by the height adjustment locking mechanism. The wheel seat is rotatably connected to the wheel frame. The wheel locking mechanism is disposed between the wheel frame and the wheel seat and is used to restrict or allow the wheel seat to rotate relative to the wheel frame. It is characterized in that, The unlocking mechanism includes: A first unlocking member rotatably disposed on the stroller frame and drivingly connected to the wheel locking mechanism to allow the wheel seat to rotate relative to the wheel frame; A second unlocking member rotatably disposed on the stroller frame and drivingly connected to the height adjustment locking mechanism to allow the upper rider frame to move relative to the lower rider frame; and An operating member movably disposed on the stroller frame and selectively driving the first unlocking member or the second unlocking member to rotate.

24. The unlocking mechanism according to claim 23, wherein A first connecting portion is provided on the first unlocking member, and the first connecting portion is disposed offset from the rotation center of the first unlocking member, and the first connecting portion is used for connecting the wheel locking mechanism; A second connecting portion is provided on the second unlocking member, and the second connecting portion is disposed offset from the rotation center of the second unlocking member, and the second connecting portion is used for connecting the height adjustment locking mechanism.

25. A trolley frame, characterized in that, Comprising: A rider frame, a wheel frame, a wheel seat, a wheel locking mechanism, and the unlocking mechanism according to claim 24, wherein the rider frame includes an upper rider frame, a lower rider frame, and a height adjustment locking mechanism disposed therebetween, and the relative movement between the upper rider frame and the lower rider frame is restricted or allowed by the height adjustment locking mechanism; the wheel seat is rotatably connected to the wheel frame, the wheel locking mechanism is disposed between the wheel frame and the wheel seat and is used for restricting or allowing the rotation of the wheel seat relative to the wheel frame, and the unlocking mechanism is disposed on the rider frame and is respectively drivingly connected to the wheel locking mechanism and the height adjustment mechanism to allow the rotation of the wheel seat relative to the wheel frame and the movement of the upper rider frame relative to the lower rider frame.

26. The trolley frame according to claim 25, characterized in that, The wheel locking mechanism includes: A first locking recess disposed on the wheel seat; A first locking member movably disposed on the wheel frame and adapted to be locked and engaged with the first locking recess; and A first traction member connected between the first unlocking member and the first locking member; When the first locking member extends into the first locking recess for locking engagement, the wheel seat is restricted from rotating relative to the wheel carrier. When the first unlocking member drives the first locking member away from the first locking recess through the first traction member to release the engagement, the wheel seat is allowed to rotate relative to the wheel carrier.

27. The trolley frame according to claim 26, wherein The first traction member is disposed within the rider frame and the wheel carrier and passes through the height adjustment locking mechanism.

28. The trolley frame according to claim 27, wherein The height adjustment locking mechanism includes a support seat provided with a first through-channel which is a U-shaped channel. One end of the first traction member away from the first unlocking member extends into the U-shaped channel from one port and exits from the other port of the U-shaped channel, so that the first traction member is disposed around the support seat.

29. The trolley frame according to claim 25, wherein The upper rider frame is slidable relative to the lower rider frame. The height adjustment locking mechanism includes: A second mating locking portion provided on the lower rider frame; A second locking assembly movably disposed on the upper rider frame and adapted to be locked in engagement with the second mating locking portion; and A second traction member connected between the second unlocking member and the second locking assembly; When the second locking assembly extends into the second mating locking portion for locking engagement, the upper rider frame is restricted from sliding relative to the lower rider frame. When the second unlocking member drives the second locking assembly away from the second mating locking portion through the second traction member to release the engagement, the upper rider frame is allowed to slide relative to the lower rider frame; or The height adjustment locking mechanism includes: A first connecting seat connected to the upper rider frame; A second connecting seat connected to the lower rider frame and pivotally connected to the first connecting seat; and A second locking member axially movably disposed between the first connecting seat and the second connecting seat to restrict or allow relative pivoting therebetween; A driving member movably disposed on the first connecting seat or the second connecting seat. The driving member axially passes through the first connecting seat or the second connecting seat and abuts against the second locking member to drive the second locking member to move; and A second traction member connecting the driving member and the second unlocking member. When the second unlocking member is operated, the second traction member drives the second locking member to move through the driving member to allow the first connecting seat to pivot relative to the second connecting seat.

30. The trolley frame according to claim 29, wherein The height adjustment locking mechanism further includes a support seat provided with a first through-channel and a second through-channel. The first through-channel is a U-shaped channel and the second through-channel is a linear channel. The second traction member is received in the linear channel; The wheel locking mechanism includes a first traction member disposed within the wheel carrier and the rider frame and passing through the U-shaped channel.

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