Stroller frame and unlocking mechanism thereof

Abstract

This invention relates to a trolley frame and its locking mechanism. The locking mechanism includes a first locking member rotatably mounted on the trolley frame and drivenly connected to a retraction locking mechanism to allow the lower handrail to pivot relative to the wheel frame; a second locking member rotatably mounted on the trolley frame and drivenly connected to a height adjustment locking mechanism to allow the upper handrail to move relative to the lower handrail; and an operating member movably mounted on the trolley frame and adapted to drive the rotation of either the first or second locking member. Therefore, the user can control the rotation of the first locking member by driving the operating member, thereby indirectly controlling the retraction locking mechanism; simultaneously, the user can also control the rotation of the second locking member by driving the operating member, thereby indirectly controlling the height adjustment locking mechanism. Because the user only needs to operate the aforementioned locking mechanism to control the different locking mechanisms separately, the ease of operation for the user is improved.

Description

Technical Field

[0001] This invention relates to the field of baby product technology, and more particularly to a stroller frame and its locking mechanism. Prior Technology

[0002] For families with infants and toddlers, using strollers as an auxiliary care tool when going out has become very common and convenient.

[0003] To meet users' needs for practicality and convenience in strollers, a folding and locking mechanism is usually installed on the stroller frame, allowing users to keep the stroller in the unfolded or folded state. In addition, to improve the stroller's versatility, a height adjustment and locking mechanism is also provided on the handlebars, allowing users to adjust the height of the handlebars to suit different users' grip preferences. Currently, common strollers typically use two separate mechanisms for folding and locking, and two separate operating mechanisms to adjust the frame position or handlebar height. However, this design can easily lead to inconvenience for users. Summary of the Invention

[0004] Therefore, it is necessary to provide a trolley frame and its unlocking mechanism to address the above problems. This unlocking mechanism can unlock both the closing locking mechanism and the height adjustment locking mechanism.

[0005] This invention provides a release mechanism applicable to a trolley frame. The trolley frame includes an upper handle, a lower handle, a wheel frame, a height adjustment locking mechanism, and a retraction locking mechanism. The upper and lower handles are restricted or allowed to move relative to each other by the height adjustment locking mechanism. The lower handle is pivotally connected to the wheel frame and is restricted or allowed to pivot relative to each other by the retraction locking mechanism. The release mechanism includes: a first release member rotatably mounted on the trolley frame and drivenly connected to the retraction locking mechanism to allow the lower handle to pivot relative to the wheel frame; a second release member rotatably mounted on the trolley frame and drivenly connected to the height adjustment locking mechanism to allow the upper handle to move relative to the lower handle; and an operating member movably mounted on the trolley frame and adapted to drive either the first or second release member to rotate.

[0006] In the aforementioned unlocking mechanism, the first unlocking member is rotatably mounted on the trolley frame and driven by the retraction locking mechanism, while the second unlocking member is rotatably mounted on the trolley frame and driven by the height adjustment locking mechanism. The operating member is movable and can drive either the first or second unlocking member to rotate. The retraction locking mechanism allows the lower handframe to pivot relative to the wheel frame, and the height adjustment locking mechanism allows the upper handframe to slide relative to the lower handframe. Therefore, the user can control the rotation of the first unlocking member by moving the operating member, thereby indirectly controlling the retraction locking mechanism to switch the trolley frame between the extended and locked states. Simultaneously, the user can also control the rotation of the second unlocking member by moving the operating member, thereby indirectly controlling the height adjustment locking mechanism to make the trolley frame height adjustable. Because the user only needs to operate the aforementioned unlocking mechanism to control the different locking mechanisms, the ease of operation for the user is improved.

[0007] In one embodiment, the release mechanism further includes a safety lock, which is movably mounted on the trolley 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 to connect with the first release member through the safety lock; when the safety lock is in the second position, the operating member is driven to connect with the second release member through the safety lock.

[0008] In one embodiment, the safety lock includes: a toggle member movably disposed on a trolley frame along a first direction and switchable between a first position and a second position; a first linkage member movably connected to the toggle member along a second direction and drivenly connected to a first release member; and a second linkage member movably connected to the toggle member along a second direction and drivenly connected to a second release member; wherein the first direction intersects the second direction, and the operating member is movable relative to the trolley frame along the second direction; when the toggle member is in the first position, the operating member can be operated to push the first linkage member to move, thereby rotating the first release member; when the toggle member is in the second position, the operating member can be operated to push the second linkage member to move, thereby rotating the second release member.

[0009] In one embodiment, the first linkage has a first abutting portion, the second linkage has a second abutting portion, and the operating member has a first driving portion and a second driving portion spaced apart; when the toggle member is in the first position, the first abutting portion is located opposite the first driving portion, and the second abutting portion is misaligned with the second driving portion; when the toggle member is in the second position, the second abutting portion is located opposite the second driving portion, and the first abutting portion is misaligned with the first driving portion.

[0010] In one embodiment, the operating member further includes a third driving part and a fourth driving part, the third driving part and the fourth driving part being spaced apart and located between the first driving part and the second driving part; the first linkage member and the second linkage member are spaced apart and a third clearance part is formed between them, the first linkage member also has a third abutting part, and the second linkage member also has a fourth abutting part; when the toggle member is in the first position, the third abutting part is located on the third driving part, and the fourth driving part is located on the third clearance part; when the toggle member is in the second position, the fourth abutting part is located on the fourth driving part, and the third driving part is located on the third clearance part.

[0011] In one embodiment, a first clearance portion is formed between the first abutting portion and the third abutting portion; a second clearance portion is formed between the second abutting portion and the fourth abutting portion; when the toggle member is in the first position and the operating member is operated, the second clearance portion is used to clear the second driving portion; when the toggle member is in the second position and the operating member is operated, the first clearance portion is used to clear the first driving portion.

[0012] In one embodiment, one of the first linkage and the first release member has a first guide recess and the other has a first mating protrusion. The first mating protrusion is slidably disposed in the first guide recess and extends along a first direction. One of the second linkage and the second release member has a second guide recess and the other has a second mating protrusion. The second mating protrusion is slidably disposed in the second guide recess and extends along a first direction.

[0013] In one embodiment, the release mechanism further includes a first elastic member abutting between the trolley frame and the actuating member, for providing an elastic restoring force to the actuating member so that the actuating member is held in a first position or a second position.

[0014] In one embodiment, the operating member has an initial position and an unlock position; when the operating member is in the initial position, the operating member can be operated to move to push the first linkage or the second linkage to move; when the operating member is in the unlock position, the operating member pushes the first linkage or the second linkage.

[0015] In one embodiment, the release mechanism further includes a second elastic member abutting between the trolley frame and the operating member to provide an elastic restoring force to the operating member so that the operating member remains in its initial position.

[0016] In one embodiment, the operating member has an initial position and an unlocking position; one of the first unlocking member and the trolley frame is provided with a first stop recess and the other is provided with a first stop protrusion. When the operating member is switched to the initial position, the first stop protrusion abuts against one side wall of the first stop recess, and when the operating member is switched to the unlocking position, the first stop protrusion abuts against the other side wall of the first stop recess; one of the second unlocking member and the trolley frame is provided with a second stop recess and the other is provided with a second stop protrusion. When the operating member is switched to the initial position, the second stop protrusion abuts against one side wall of the second stop recess, and when the operating member is switched to the unlocking position, the second stop protrusion abuts against the other side wall of the second stop recess.

[0017] In one embodiment, the first release member is provided with a first connecting part, which is offset from the rotation center of the first release member, and the first connecting part is used to connect to the closing locking mechanism; the second release member is provided with a second connecting part, which is offset from the rotation center of the second release member, and the second connecting part is used to connect to the height adjustment locking mechanism.

[0018] The present invention also provides a trolley frame, including an upper frame, a lower frame, a wheel frame, a folding locking mechanism, a height adjustment locking mechanism, and a release mechanism as described above. The upper frame and the lower frame are restricted or allowed to move relative to each other by the height adjustment locking mechanism. The lower frame and the wheel frame are pivotally connected and restricted or allowed to pivot relative to each other by the folding locking mechanism. The release mechanism is disposed on the frame or the wheel frame and is drivenly connected to the folding locking mechanism and the height adjustment locking mechanism, respectively, so as to allow the lower frame to pivot relative to the wheel frame and the upper frame to move relative to the lower frame.

[0019] In one embodiment, the retraction locking mechanism includes a first locking member and a fixing member. The fixing member has a locking recess and is installed in one of the wheel frame or the undercarriage frame. The first locking member is movably disposed in the other of the wheel frame or the undercarriage frame and is operably connected to a first unlocking member. When the first locking member is inserted into the locking recess, the undercarriage frame is restricted from pivoting relative to the wheel frame. When the first locking member is retracted from the locking recess, the undercarriage frame can pivot relative to the wheel frame.

[0020] In one embodiment, the retraction locking mechanism further includes a first traction member connected between a first release member and a first locking member, wherein the first release member drives the first locking member to retract from the locking recess via the first traction member.

[0021] In one embodiment, the height adjustment locking mechanism includes a rider locking component and a locking hole. One of the upper and lower handframes is provided with a locking hole, and the other is provided with a rider locking component. The rider locking component can engage with the locking hole to lock the upper and lower handframes.

[0022] In one embodiment, the rider locking assembly is disposed on the upper rider frame. The rider locking assembly includes: a movable member movably disposed on the upper rider frame and operably connected to a second release member, the movable member having a guide groove that extends obliquely relative to the moving direction of the movable member; and a second locking member having a guide post that extends into and slides into the guide groove to be able to extend into or retract from a locking hole.

[0023] In one embodiment, the height adjustment locking mechanism further includes a second traction member connected between the second release member and the moving member. The second release member drives the moving member to move via the second traction member, thereby driving the second locking member to retract from the locking hole.

[0024] In one embodiment, multiple locking holes are provided, and the multiple locking holes are spaced apart along the sliding direction of the upper frame relative to the lower frame.

[0025] This application provides a release mechanism applicable to a trolley frame. The trolley frame includes a handlebar, a wheel frame, a reversing locking mechanism, and a retraction locking mechanism. The handlebar is rotatably mounted on the wheel frame. Both the reversing locking mechanism and the retraction locking mechanism are disposed between the handlebar and the wheel frame. The handlebar can be restricted or allowed to rotate relative to the wheel frame for reversing by means of the reversing locking mechanism, and the handlebar can also be restricted or allowed to rotate relative to the wheel frame for retraction by means of the retraction locking mechanism. The release mechanism includes: a first release member, rotatably mounted on the trolley frame and drivenly connected to the reversing locking mechanism to allow the handlebar to rotate relative to the wheel frame for reversing; a second release member, rotatably mounted on the trolley frame and drivenly connected to the retraction locking mechanism to allow the handlebar to rotate relative to the wheel frame for retraction; and an operating member, movably mounted on the trolley frame, and selectively driving the first or second release member to rotate.

[0026] In one embodiment, the release mechanism further includes a safety lock, which is movably mounted on the trolley 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 to connect with the first release member through the safety lock; when the safety lock is in the second position, the operating member is driven to connect with the second release member through the safety lock.

[0027] In one embodiment, the safety lock includes: a first linkage, drivenly connected to a first release member; a second linkage, drivenly connected to a second release member; and a toggle member, respectively connected to the first linkage and the second linkage. The toggle member is movably mounted on the trolley frame and can switch between a first position and a second position to drive the first linkage and the second linkage to move along a third direction. When the toggle member is in the first position, the operating member is operated to push the first linkage to move along a fourth direction, causing the first release member to rotate. When the toggle member is in the second position, the operating member is operated to push the second linkage to move along a fourth direction, causing the second release member to rotate. The third direction intersects with the fourth direction.

[0028] In one embodiment, the first release member is provided with a first connecting part, which is offset from the rotation center of the first release member, and the first connecting part is used to connect to the reversing locking mechanism; the second release member is provided with a second connecting part, which is offset from the rotation center of the second release member, and the second connecting part is used to connect to the closing locking mechanism.

[0029] This application also provides a trolley frame having an extended state and a retracted state, including: a wheel frame; a handlebar frame rotatably mounted on the wheel frame; a reversing locking mechanism disposed between the handlebar frame and the wheel frame, wherein the handlebar frame can be restricted or allowed to rotate relative to the wheel frame for reversing; a retraction locking mechanism disposed between the handlebar frame and the wheel frame, wherein the handlebar frame can be restricted or allowed to rotate relative to the wheel frame for retraction; and a release mechanism as described above, disposed on the handlebar frame and drivenly connected to the retraction locking mechanism and the release mechanism respectively, so as to allow the handlebar frame to rotate relative to the wheel frame for reversing or retraction.

[0030] In one embodiment, the rider frame and wheel frame are pivotally connected 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 circumferentially spaced on the wheel frame around the first pivot point, the first locking member is disposed on the rider frame and 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 rider frame is in the first use position, and when the first locking member engages with the second engaging member, the rider frame is in the second use position.

[0031] In one embodiment, when the trolley frame is in a first use position, the top of the trolley frame is located on a first side of the wheel frame; when the trolley frame is in a second use position, the top of the trolley 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 direction of travel of the trolley frame.

[0032] In one embodiment, the first locking member has a locking portion, and both the first engaging member and the second engaging member are provided with a locking portion adapted to engage with the locking portion; the first locking member is movably disposed on the rider 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 restrict the switching of the rider 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 rider frame to switch between the first use position and the second use position.

[0033] In one embodiment, the reversing locking mechanism further includes: a first driving member, movably mounted on the rider frame and connected to the first locking member; and a first traction member, respectively connected to the first driving member and the first unlocking member; when the first unlocking member rotates, the first unlocking member drives the first driving member to move through the first traction member, thereby causing the first locking member to move from the first locking position to the first unlocking position.

[0034] In one embodiment, the handframe and wheel frame are pivotally connected at a first pivot point, so that the handframe has a first use position and a third use position relative to the wheel frame; when the handframe is in the first use position, the handframe moves away from the wheel frame around the first pivot point, so that the trolley frame is in an extended state; when the handframe is in the third use position, the handframe moves closer to the wheel frame around the first pivot point, so that the trolley frame is in a folded state.

[0035] In one embodiment, the retraction locking mechanism includes: a second locking member movable relative to the rider frame and having a second locked position and a second unlocked position; the wheel frame includes a rear wheel frame and a first transmission member, one end of the first transmission member being pivotally connected to the rear wheel frame and the other end being pivotally connected to the rider frame at a first pivot point; when the second locking member is in the second locked position, the second locking member engages with the first transmission member to restrict the rider frame from pivoting relative to the first transmission member, thereby restricting the switching of the rider frame between a first use position and a third use position; when the second locking member is in the second unlocked position, the second locking member disengages from the first transmission member to allow the rider frame to pivot relative to the first transmission member, thereby allowing the rider frame to switch between the first use position and the third use position.

[0036] In one embodiment, the first transmission member has a first recess and a second recess. When the trolley frame is in the unfolded state, the second locking member engages with the first recess; when the trolley frame is in the retracted state, the second locking member engages with the second recess.

[0037] In one embodiment, the retraction locking mechanism further includes: a second driving element, 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 element and the second release member; when the second release member rotates, the second release member drives the second driving element to move through the second traction member, thereby causing the second locking member to move from the second locking position to the second release position.

[0038] This application provides a release mechanism applicable to a trolley frame. The trolley frame includes a handlebar, a wheel frame, a wheel seat, and a wheel locking mechanism. The handlebar includes an upper handlebar, a lower handlebar, and a height adjustment locking mechanism disposed between the two. The upper and lower handlebars restrict or allow relative movement between them through 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 rotation of the wheel seat relative to the wheel frame. The release mechanism includes: a first release member, rotatably disposed on the trolley frame and drivenly connected to the wheel locking mechanism to allow rotation of the wheel seat relative to the wheel frame; a second release member, rotatably disposed on the trolley frame and drivenly connected to the height adjustment locking mechanism to allow movement of the upper handlebar relative to the lower handlebar; and an operating member, movably disposed on the trolley frame, and selectively driving the first or second release member to rotate.

[0039] In one embodiment, the first release member is provided with a first connecting part, which is offset from the rotation center of the first release member, and the first connecting part is used to connect to the wheel locking mechanism; the second release member is provided with a second connecting part, which is offset from the rotation center of the second release member, and the second connecting part is used to connect to the height adjustment locking mechanism.

[0040] This application also provides a trolley frame, including: a handlebar frame, a wheel frame, wheel seats, a wheel locking mechanism, and a release mechanism as described above. The handlebar frame includes an upper handlebar frame, a lower handlebar frame, and a height adjustment locking mechanism disposed between the two. The upper handlebar frame and the lower handlebar frame restrict or allow relative movement between them through the height adjustment locking mechanism. The wheel seats are 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. The release mechanism is disposed on the handlebar frame and is drivenly connected to the wheel locking mechanism and the height adjustment mechanism respectively, so as to allow the wheel seat to rotate relative to the wheel frame and the upper handlebar frame to move relative to the lower handlebar frame.

[0041] In one embodiment, 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 lock into 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 to lock into the recess, the wheel seat is restricted from rotating relative to the wheel frame; when the first release member drives the first locking member to retract from the first locking recess via the first traction member to release the engagement, the wheel seat is allowed to rotate relative to the wheel frame.

[0042] In one embodiment, the first traction member is disposed within the rider frame and wheel frame and passes through the height adjustment locking mechanism.

[0043] In one embodiment, the height adjustment locking mechanism includes a support base with a first through-channel, which is a U-shaped channel. The end of the first traction member away from the first release member extends into the U-shaped channel from one opening and extends out from the other opening of the U-shaped channel, so that the first traction member is arranged around the support base.

[0044] In one embodiment, the upper frame can slide relative to the lower frame, and the height adjustment locking mechanism includes: a second locking part disposed on the lower frame; a second locking element movably disposed on the upper frame and adapted to lock into the second locking part; and a second traction member connected between the second release member and the second locking element; when the second locking element extends into the second locking part to lock into the engagement, the upper frame is restricted from sliding relative to the lower frame; when the second release member drives the second locking element to retract from the second locking part through the second traction member to release the engagement, the upper frame is allowed to slide relative to the lower frame.

[0045] In one embodiment, the height adjustment locking mechanism further includes a support base, which has 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 straight channel. The second traction member is accommodated in the straight channel. The wheel locking mechanism includes a first traction member, which is disposed in the wheel frame and the rider frame and passes through the U-shaped channel.

[0046] In one embodiment, the height adjustment locking mechanism includes: a first connecting seat connected to the upper frame; a second connecting seat connected to the lower 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 between the two.

[0047] In one embodiment, the height adjustment locking mechanism further includes: a drive member movably disposed on the side of the first connecting seat opposite to the second connecting seat or the side of the second connecting seat opposite to the first connecting seat, the drive member passing axially through the first connecting seat or the second connecting seat and abutting against the second locking member to drive the second locking member to move; and a second traction member connecting the drive member and the second release member, the second traction member driving the second locking member to move via the drive member when the second operating member is operated, so as to allow the first connecting seat to pivot relative to the second connecting seat. Simple Explanation of the Diagram

[0048] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application. To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown as examples only and not necessarily to scale. In the accompanying drawings: Figure 1 schematically shows a perspective view of a trolley frame according to an embodiment of this application. Figure 2 schematically shows a perspective view of the trolley frame from another angle in one embodiment of this application. Figure 3 is a cross-sectional view along line U1-U1 in Figure 1, in which the first locking member is inserted into the locking recess. Figure 4 is a cross-sectional view along line U1-U1 in Figure 1, in which the first locking member retracts from the locking recess. Figure 5 is a three-dimensional view of the handframe in the trolley frame shown in Figure 1. Figure 6 is a perspective view of the handframe in the trolley frame shown in Figure 1 from another angle. Figure 7 is a perspective view of the upper frame of the frame shown in Figure 5, in which the moving part of the height adjustment locking mechanism is assembled with the second locking part. Figure 8 is a perspective view of the upper frame of the frame shown in Figure 5, in which the moving part and the second locking part of the height adjustment locking mechanism are separated. Figure 9 is an enlarged schematic diagram of the structure at circle A in Figure 2. Figure 10 is an exploded view of the release mechanism on the rider frame shown in Figure 5. Figure 11 is an enlarged schematic diagram of the structure at circle B in Figure 10. Figure 12 is a partial structural diagram of the release mechanism, in which the actuating element is in the first position and the operating element is in the initial position. Figure 13 is a partial structural diagram of the release mechanism, in which the actuating element is in the first position and the operating element is in the release position. Figure 14 is a partial structural diagram of the release mechanism, in which the actuating element is in the second position and the operating element is in the initial position. Figure 15 is a partial structural diagram of the release mechanism, in which the actuating element is in the second position and the operating element is in the release position. Figure 16 is a perspective view of the trolley frame in an unfolded state according to an embodiment of this application, wherein the second locking member is in the second locking position. Figure 17 is a perspective view of the trolley frame in an embodiment of this application when it is in the unfolded state, wherein the second locking member is in the second unlocking position. Figure 18 is a side view of the trolley frame shown in Figure 16. Figure 19 is an enlarged schematic diagram of the structure at circle A shown in Figure 16. Figure 20 is an enlarged schematic diagram of the structure at circle B shown in Figure 17. Figure 21 is a cross-sectional view of the handframe in the trolley frame shown in Figure 16, with the operating components in the initial position. Figure 22 is a cross-sectional view of the handframe in the trolley frame shown in Figure 16, where the operating component is in the unlocked position and the first release component is rotating. Figure 23 is a perspective view of the trolley frame in a folded state according to an embodiment of this application. Figure 24 is a side view of the trolley frame in a folded state according to an embodiment of this application. Figure 25 is a cross-sectional view along line U1-U1 in Figure 18. Figure 26 is an enlarged schematic diagram of the structure at circle C shown in Figure 23. Figure 27 is an enlarged schematic diagram of the structure at circle D shown in Figure 21. Figure 28 is a cross-sectional view of the handframe in the trolley frame shown in Figure 16, where the operating component is in the unlocked position and the second release component is rotating. Figure 29 is a perspective view of the release mechanism in the trolley frame shown in Figure 16. Figure 30 is a partial structural schematic diagram of the unlocking mechanism shown in Figure 29. Figure 31 is an exploded view of the unlocking mechanism shown in Figure 29. Figure 32 is a cross-sectional view of the unlocking mechanism shown in Figure 30. Figure 33 is a perspective view of the trolley frame in the unfolded state in the first embodiment of this application. Figure 34 is a cross-sectional view of the trolley frame shown in Figure 33. Figure 35 is a perspective view of the trolley frame shown in Figure 33 in the folded state. Figure 36 is a cross-sectional view of the trolley frame shown in Figure 34. Figure 37 is a cross-sectional view of the handframe in the trolley frame shown in Figure 33; Figure 38 is a perspective view of the release mechanism in the trolley frame shown in Figure 33. Figure 39 is a partial structural schematic diagram of the unlocking mechanism shown in Figure 38. Figure 40 is an exploded view of the unlocking mechanism shown in Figure 38. Figure 41 is a cross-sectional view of the unlocking mechanism shown in Figure 37, in which the first unlocking element is rotated. Figure 42 is a cross-sectional view of the unlocking mechanism shown in Figure 37, in which the second unlocking element is rotated. Figure 43 is a cross-sectional view of the unlocking mechanism shown in Figure 39. Figure 44 is a perspective view of the rider's frame in another embodiment. Figure 45 is a perspective view of the handframe in the trolley frame in the second embodiment of this application. Figure 46 is a side view of the rider frame shown in Figure 45. Figure 47 is an exploded view of the frame structure shown in Figure 45. Figure 48 is a cross-sectional view of the rider frame shown in Figure 45, with the second locking element in the locked position. Figure 49 is a sectional view of a partial structure of the rider frame shown in Figure 45, in which the second locking element is in the unlocked position. Figure 50 is a cross-sectional view of a partial structure of the rider's frame in another embodiment. Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] Figures 1 and 2 illustrate a trolley frame 1000X provided according to some embodiments of the present invention. The overall structure of the trolley frame 1000X is generally symmetrical from left to right. It 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 provided according to some embodiments of the present invention. The handlebar frame 200X, wheel frame 300X, height adjustment locking mechanism 400X, folding locking mechanism 500X, and release mechanism 100X will be described in detail below while the trolley frame 1000X is being described.

[0051] Referring again to Figures 1 and 2, the stroller frame 1000X can be used as the frame for a child 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 unfolded state and a folded state (in other embodiments, the folded state may also be referred to as a folded state or 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 end of the lower handlebar frame 220X away from the upper handlebar frame 210X is pivotally connected to the wheel frame 300X. More specifically, the wheel frame 300X includes a front wheel frame 310X and a rear wheel frame 320X that are pivotally connected, with the lower handlebar frame 220X 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 300X wheel frame (including the 310X front wheel frame and the 320X rear wheel frame) and the 200X rider frame (including the 210X upper rider frame and the 220X lower rider frame) will be further explained below.

[0052] Referring to Figures 1 and 2, in one embodiment, the front wheel frame 310X has, for example, a U-shaped structure, including front rods 311X located on the left and right sides and a front crossbar 312X connecting 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 the frame of a children's stroller, the front crossbar 312X can also be used as a foot pedal.

[0053] 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, and the two front wheel seats 313X are 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 the front wheel 610X so that the trolley frame 1000X is movable. Of course, in another alternative embodiment, the front wheel frame 310X can also have other implementations, such as the front wheel frame 310X including 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 mounted centrally on the bottom of the front wheel frame 310X. Alternatively, for example, the front wheel frame 310X may consist of only two front struts 311X arranged roughly parallel to each other in the left-right direction, and the two front wheel seats 313X may be connected to the two front struts 311X respectively.

[0054] It should be noted that, unless otherwise explicitly specified and limited, the directional terms such as "left" and "right" for the trolley frame 1000X in various embodiments of the present invention are based on the "left" and "right" orientations of the trolley frame 1000X during normal operation, and the "left" and "right" directions are schematically indicated by arrows L and R in the figures. These directional terms are only used to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention.

[0055] In one embodiment, the rear wheel frame 320X can also be, for example, U-shaped, including two rear rods 321X located on the left and right sides and a rear crossbar (not shown) connecting the two rear rods 321X, with the rear crossbar extending along a first direction F1. Of course, in another alternative embodiment, the rear wheel frame 320X can have other implementations, such as the rear wheel frame 320X including only two rear rods 321X, with one end of the two rear rods 321X connected to form a V-shape. Specifically, referring to Figures 1 and 2, in this embodiment, the rear wheel frame 320X may include two rear rods 321X arranged substantially parallel in the left-right direction, and a reinforcing rod 322X connecting the two rear rods 321X. This improves the structural stability of the rear wheel frame 320X. Specifically, the bottom ends of the two rear rods 321X are respectively provided with rear wheel seats 323X. Each rear wheel seat 323X is used to mount the rear wheel 620X to make the trolley frame 1000X movable. In this embodiment, the rear wheel 620X is larger than the front wheel 610X to make the overall structure of the stroller frame 1000X more stable. Of course, in another alternative embodiment, the rear wheel 620X may be the same size as or larger than the front wheel 610X.

[0056] Specifically, in this embodiment, the upper ends of the two rear links 321X are pivotally connected to the front links 311X on the same side, forming pivot points. This means that the rear links 321X on the same side can rotate relative to the front links 311X on the same side around the corresponding pivot points. In this way, the volume of the wheel frame 300X can be changed.

[0057] Referring to Figures 1 and 2, the cart frame 200X includes an upper cart frame 210X and a lower cart frame 220X, which are movable relative to each other. For example, the upper cart frame 210X can slide and engage with the lower cart frame 220X, thus changing the height of the cart frame 200X relative to the ground to facilitate gripping by users of different heights and improve the applicability of the cart frame 1000X. Specifically, the upper cart frame 210X has a U-shaped structure, including two first support tubes 211X and a push handle tube 212X connected between the two first support tubes 211X. The first support tubes 211X are straight tubes, and the push handle tube 212X has a U-shaped structure and is connected between the two first support tubes 211X for users to grip and push the cart frame 1000X. More specifically, the dismounting scaffold 220X includes, for example, two second support tubes 221X. The upper ends of the two second support tubes 221X are respectively slidably sleeved with the first support tube 211X on the same side, and the lower ends of the two second support tubes 221X are respectively pivotally connected with the front rod 311X on the same side. It should be noted that the slidable sleeve of the two second support tubes 221X with the first support tube 211X on the same side includes two implementations: the second support tube 221X is sleeved outside the first support tube 211X, or the first support tube 211X is sleeved outside the second support tube 221X. Specifically, in this embodiment, the principle of their cooperation is specifically explained using the example of the second support tube 221X being sleeved outside the first support tube 211X.

[0058] To prevent the handframe 200X from rotating freely relative to the wheel frame 300X and to ensure the trolley frame 1000X remains stably in the extended state, in one embodiment, the handframe 200X and wheel frame 300X can be restricted or allowed to pivot relative to each other via a retraction locking mechanism 500X. Furthermore, to prevent the upper handframe 210X from moving freely relative to the lower handframe 220X and to ensure the handframe 200X remains stably at a specific height, in one embodiment, the upper handframe 210X and lower handframe 220X can be restricted or allowed to move relative to each other via a height adjustment locking mechanism 400X. The specific structure and working principle of the retraction locking mechanism 500X and the height adjustment locking mechanism 400X will be further described below.

[0059] Referring to Figures 3 and 4, in one embodiment, the retraction locking mechanism 500X includes a first locking member 510X and a fixing member 520X. The fixing member 520X has a locking recess 521X and is installed in one of the wheel frame 300X or the undercarriage support 220X. The first locking member 510X is movably disposed in the other of the wheel frame 300X or the undercarriage support 220X and is operably connected to the first unlocking member 110X. For example, when the fixing member 520X is disposed on the wheel frame 300X, the first locking member 510X is movably disposed in the undercarriage support 220X. Alternatively, when the fixing member 520X is disposed on the undercarriage support 220X, the first locking member 510X is movably disposed on the wheel frame 300X. Specifically, in this embodiment, the fixing member 520X is fixedly disposed within the front rod 311X of the front wheel frame 310X, and the first locking member 510X is movably disposed within the second support tube 221X of the undercarriage frame 220X. When the first locking member 510X is inserted into the locking recess 521X (see Figure 3), the undercarriage frame 220X is restricted from pivoting relative to the wheel frame 300X. When the first locking member 510X is retracted from the locking recess 521X (see Figure 4), the undercarriage frame 220X can pivot relative to the wheel frame 300X.

[0060] In one embodiment, the retraction locking mechanism 500X further includes a first traction member 530X (see Figures 3 and 4), which is used to connect to the first locking member 510X. In this way, the user can drive the first locking member 510X to retract from the locking recess 521X by pulling the first traction member 530X.

[0061] In one embodiment, the retraction locking mechanism 500X further includes a third elastic element (not shown in the figure), which abuts between the first locking member 510X and the unloading handle 220X, for driving the first locking member 510X to reset so that the third elastic element constantly has a tendency to insert into the locking recess 521X. Specifically, the third elastic element may be, for example, an elastic element with elasticity such as a spring or a sheet.

[0062] In this embodiment, in order to improve the stability of the folding and locking mechanism 500X when locking, the trolley frame 1000X is provided with two folding and locking mechanisms 500X, and the aforementioned folding and locking mechanism 500X is provided between the front rod 311X and the second support tube 221X on the same side.

[0063] Referring to Figures 5 to 8, in one embodiment, the height adjustment locking mechanism 400X includes a rider locking component 410X and a locking hole 420X. One of the upper rider frame 210X and the lower rider frame 220X is provided with the locking hole 420X, and the other is provided with the rider locking component 410X. Specifically, in this embodiment, the second support tube 221X of the lower rider frame 220X is provided with the locking hole 420X, and the first support tube 211X of the upper rider frame 210X is provided with the rider locking component 410X. The rider locking component 410X can engage with the locking hole 420X. Therefore, when the first support tube 211X and the corresponding second support tube 221X move relative to each other so that the rider locking component 410X is aligned with the locking hole 420X, the rider locking component 410X is inserted into the locking hole 420X to lock the upper rider frame 210X and the lower rider frame 220X. More specifically, multiple locking holes 420X are provided, and the multiple locking holes 420X are spaced apart along the sliding direction of the upper frame 210X relative to the lower frame 220X. In this way, when the driver locking assembly 410X is inserted into different locking holes 420X, the upper frame 210X can be kept at different heights relative to the lower frame 220X.

[0064] Referring to Figures 7 and 8, in one embodiment, as described above, the rider locking assembly 410X is disposed in the first support tube 211X of the upper frame 210X. The rider locking assembly 410X includes a movable member 411X and a second locking member 412X. The movable member 411X is movably disposed in the first support tube 211X of the upper frame 210X. Specifically, the movable member 411X is provided with a guide groove 4111X, which extends obliquely relative to the moving direction of the movable member 411X. The second locking member 412X has a guide post (not shown in the figures) that extends into and slides within the guide groove 4111X to be able to enter or exit the locking hole 420X. Specifically, in one embodiment, as shown in Figures 7 and 8, the rider locking 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 to extend into or retract from the locking hole 420X. More specifically, the rider locking assembly 410X also includes a fourth elastic member 414X (see Figure 8), which abuts between the support base 413X and the moving member 411X to drive the moving member 411X to reset, so that the second locking member 412X constantly has a tendency to insert into the locking hole 420X. Specifically, the fourth elastic member 414X may also be, for example, a spring or a sheet, or other elastic member with elasticity.

[0065] In one embodiment, the height adjustment locking mechanism 400X further includes a second traction member 430X (see Figure 12), which is used to connect to the movable member 411X. In this way, the user can move the movable member 411X by pulling the second traction member 430X, thereby indirectly driving the second locking member 412X to disengage from the locking hole 420X.

[0066] In this embodiment, in order to improve the stability of the height adjustment locking mechanism 400X when locking, the trolley frame 1000X is provided with two height adjustment locking mechanisms 400X, and the aforementioned height adjustment locking mechanism 400X is provided between the first support tube 211X and the second support tube 221X on the same side.

[0067] To improve the convenience of users in releasing the locking mechanism 500X and the height adjustment locking mechanism 400X, in some embodiments of the present invention, the release mechanism 100X can perform release operations on the 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 trolley frame 1000X, for example, on the handlebar frame 200X or the wheel frame 300X. The first release member 110X is drivenly connected to the locking mechanism 500X to allow the dismount handlebar frame 220X to pivot relative to the wheel frame 300X. Specifically, the first release member 110X is drivenly connected to the first locking member 510X in the locking mechanism 500X. The second release element 120X is rotatably mounted on the trolley frame 1000X, for example, on the handlebar frame 200X or the wheel frame 300X. The second release element 120X is driven to a height adjustment locking mechanism 400X to allow movement of the upper handlebar frame 210X relative to the lower handlebar frame 220X. Specifically, the second release element 120X is driven to a moving element 411X in the height adjustment locking mechanism 400X. An operating element 130X is movably mounted on the trolley frame 1000X and is adapted to drive the rotation of either the first release element 110X or the second release element 120X.

[0068] Since the first unlocking member 110X is rotatably mounted on the trolley frame 1000X and drivenly connected to the first locking member 510X, and the second unlocking member 120X is rotatably mounted on the trolley frame 1000X and drivenly connected to the moving member 411X, and the operating member 130X is movable and used to drive either the first unlocking member 110X or the second unlocking member 120X to rotate, the user can control the rotation of the first unlocking member 110X by driving the movement of the operating member 130X, thereby indirectly controlling the first locking member 510X in the closing and locking mechanism 500X. When the first locking member 510X is inserted into the locking recess 521X, the trolley frame 1000X can remain in the unfolded state. When the first locking member 510X is withdrawn from the locking recess 521X, the trolley frame 1000X can switch from the unfolded state to the locked state. Simultaneously, the user can control the rotation of the second release element 120X by moving the drive operating element 130X, thereby indirectly controlling the moving element 411X and the second locking element 412X in the height adjustment locking mechanism 400X. When the second locking element 412X is inserted into the locking hole 420X, the upper frame 210X and the lower frame 220X cannot slide relative to each other. When the second locking element 412X is removed from the locking hole 420X, the upper frame 210X and the lower frame 220X can slide relative to each other, thus making the height of the frame 200X adjustable. Because the user only needs to operate the aforementioned release mechanism 100X to control different locking mechanisms separately, the user's operational convenience is improved.

[0069] To facilitate user operation of the release mechanism 100X, as shown in Figures 9 to 11, the release mechanism 100X is mounted on the pusher tube 212X of the upper frame 210X. Specifically, both the first release member 110X and the second release member 120X are disc-shaped and are rotatably mounted on the pusher tube 212X via connecting members such as pins. More specifically, the first release member 110X is provided with a first connecting portion 111X, which is offset from the rotation center of the first release member 110X. For example, it can be arranged in a straight line or in a non-linear shape, but it is not limited to this. The first connecting portion 111X is used to connect to the retraction locking mechanism 500X. Specifically, referring to Figures 3, 12, and 13, the first connecting portion 111X is connected to the first locking member 510X in the retraction locking mechanism 500X via a first traction member 530X. When the first unlocking member 110X rotates around its rotation center, the first connecting portion 111X rotates synchronously around the rotation center of the first unlocking member 110X, thereby driving the first traction member 530X to move and pull the first unlocking member 110X to move and retract from the locking recess 521X. Similarly, the second unlocking member 120X is provided with a second connecting portion 121X, which is offset from the rotation center of the second unlocking member 120X. For example, it can be arranged in a straight line or in a non-linear shape, but it is not limited to this. The second connecting portion 121X is used to connect the height adjustment locking mechanism 400X. Specifically, referring to Figures 14 and 15, the second connecting portion 121X is connected to the moving member 411X in the height adjustment locking mechanism 400X through the second traction member 430X. When the second release member 120X rotates around its rotation center, the second connecting part 121X will rotate synchronously around the rotation center of the second release member 120X, which will drive the second traction member 430X to move and pull the moving member 411X to move. Under the action of the guide groove 4111X, the first locking member 510X will be driven to move to disengage from the locking hole 420X.

[0070] Specifically, in this embodiment, both the first traction member 530X and the second traction member 430X can be, for example, traction ropes. More specifically, the first release member 110X has two first connecting portions 111X, and the second release member 120X has two second connecting portions 121X. The two first connecting portions 111X are respectively connected to the two first traction members 530X, and the two second connecting portions 121X are respectively connected to the two second traction members 430X. Thus, when the first release member 110X rotates, it can simultaneously control the movement of the two first locking members 510X to disengage from the corresponding locking recesses 521X. When the second release member 120X rotates, it can simultaneously control the movement of the two moving members 411X, thereby controlling the two second locking members 412X to disengage from the corresponding locking holes 420X.

[0071] Referring to Figures 9 and 12 to 15, the release mechanism 100X also includes a safety lock 140X (in other embodiments, the safety lock 140X may also be referred to as the frame folding safety lock 140X). The safety lock 140X is movably mounted on the trolley frame 1000X and can switch between a first position and a second position. When the safety lock 140X is pushed to the first position, the operating member 130X is driven connected to the first release member 110X via the safety lock 140X. When the safety lock 140X is pushed to the second position, the operating member 130X is driven connected to the second release member 120X via the safety lock 140X. Specifically, when the user needs to release the folding locking mechanism 500X to switch the trolley frame 1000X from an unfolded state to a folded state, the safety lock 140X can be moved to the first position, and thus, the first release member 110X can be rotated by operating the operating member 130X. When the user needs to release the height adjustment locking mechanism 400X so that the height of the rider frame 200X is adjustable, the safety lock 140X can be moved to the second position. In this way, the second release element 120X can be rotated by operating the operating element 130X.

[0072] Referring to Figures 12 to 15, in one embodiment, the safety lock 140X includes a toggle member 141X, a first linkage member 142X, and a second linkage member 143X. The toggle member 141X is movably mounted on the trolley frame 1000X (e.g., the push handle tube 212X) along a first direction F1 and can switch between a first position and a second position. The first linkage member 142X is movably connected to the toggle member 141X along a second direction F2 and is drivenly connected to the first release member 110X. The second linkage member 143X is movably connected to the toggle member 141X along a second direction F2 and is drivenly 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 trolley frame 1000X along the second direction F2. Specifically, when the actuating member 141X is in the first position, the operating member 130X can be operated to push the first linkage member 142X to move along the second direction F2, thereby causing the first release member 110X to rotate. When the actuating member 141X is in the second position, the operating member 130X can be operated to push the second linkage member 143X to move along the second direction F2, thereby causing the second release member 120X to rotate.

[0073] Referring again to Figures 12 to 15, in one embodiment, the first linkage 142X has a first abutment portion 1421X, and the second linkage 143X has a second abutment portion 1431X. The operating member 130X has a first driving portion 131X and a second driving portion 132X spaced apart. As shown in Figures 12 and 13, when the actuating member 141X is in the first position, the first abutment portion 1421X is positioned opposite the first driving portion 131X, and the second abutment portion 1431X is misaligned with the second driving portion 132X. Thus, when the operating member 130X moves upward along the second direction F2, the first driving portion 131X can abut against the first abutment portion 1421X, thereby pushing the first linkage 142X to move along the second direction F2, thereby driving the first unlocking member 110X to rotate, ultimately releasing the locking mechanism 500X. Meanwhile, since the second abutment portion 1431X and the second drive portion 132X are misaligned, when the operating member 130X moves upward along the second direction F2, the second drive portion 132X will not contact the second abutment portion 1431X. This allows the second linkage member 143X and the second release member 120X to remain stationary, meaning that when the operating member 130X is operated, it will 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 is positioned opposite the second drive portion 132X, and the first abutment portion 1421X is misaligned with the first drive portion 131X. Thus, when the operating member 130X moves upward along the second direction F2, the second driving part 132X can abut against the second abutting part 1431X, thereby pushing the second linkage member 143X to move along the second direction F2, and then driving the second unlocking member 120X to rotate, ultimately releasing the height adjustment locking mechanism 400X. At the same time, since the first abutting part 1421X and the first driving part 131X are misaligned, when the operating member 130X moves upward along the second direction F2, the first driving part 131X will not contact the first abutting part 1421X, thereby allowing the first linkage member 142X and the first unlocking member 110X to remain stationary, that is, when the operating member 130X is operated, it will not affect the closing locking mechanism 500X.

[0074] 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 linkage member 142X and the second linkage member 143X are spaced apart, and a third clearance portion 144X is formed between them. Specifically, the first linkage member 142X also has a third abutting portion 1422X, and the second linkage member 143X also has 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 is located opposite the third driving portion 133X, the first abutting portion 1421X is located opposite the first driving portion 131X, and the fourth driving portion 134X is located opposite the third clearance portion 144X. Therefore, when the operating member 130X moves upward along the second direction F2, the first driving part 131X abuts against the first abutting part 1421X, and the third abutting part 1422X abuts against the third driving part 133X, thereby simultaneously pushing the first linkage member 142X to move along the second direction F2. At the same time, as the operating member 130X moves upward along the second direction F2, the fourth driving part 134X gradually inserts into the third clearance part 144X, preventing the second linkage member 143X from moving when the actuating member 141X is in the first position. As shown in Figures 14 and 15, when the actuating member 141X is in the second position, the fourth abutting part 1432X is positioned opposite the fourth driving part 134X, the second abutting part 1431X is positioned opposite the second driving part 132X, and the third driving part 133X is positioned opposite the third clearance part 144X. Therefore, when the operating member 130X moves upward along the second direction F2, the second driving part 132X can abut against the second abutting part 1431X, and the fourth abutting part 1432X can abut against the fourth driving part 134X, thereby simultaneously pushing the second linkage member 143X to move along the second direction F2. At the same time, as the operating member 130X moves upward along the second direction F2, the third driving part 133X gradually inserts into the third clearance part 144X, preventing the first linkage member 142X from moving when the toggle member 141X is in the second position.

[0075] Referring to Figures 12 and 14, in one embodiment, the unlocking mechanism 100X further includes a first elastic element 150X. The first elastic element 150X abuts against the trolley frame 1000X (e.g., push handle tube 212X) and the actuating element 141X, providing an elastic restoring force to the actuating element 141X to maintain it in a first or second position. For example, when the first elastic element 150X is used to constantly maintain the actuating element 141X in the first position, if the locking mechanism 500X needs to be unlocked, the operating element 130X can be directly operated (e.g., pressed or pushed upwards). If the height adjustment locking mechanism 400X needs to be unlocked, the actuating element 141X must first be moved to the second position before operating the operating element 130X. After the height adjustment locking mechanism 400X is unlocked, the actuating element 141X is released, and under the resetting action of the first elastic element 150X, the actuating element 141X automatically returns to the first position.

[0076] 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 actuating 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 actuating 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.

[0077] In one embodiment, one of the first linkage 142X and the first release member 110X has a first guide recess (not shown in the figure), and the other has a first mating protrusion (not shown in the figure). The first mating protrusion is slidably disposed within the first guide recess, and the first guide recess extends along a first direction F1. Similarly, one of the second linkage 143X and the second release member 120X has a second guide recess (not shown in the figure), and the other has a second mating protrusion (not shown in the figure). The second mating protrusion is slidably disposed within the second guide recess, and the second guide recess extends along a first direction F1. Thus, when the actuating member 141X switches between the first position and the second position along the first direction F1, it can drive the first linkage member 142X and the second linkage member 143X to move left and right along the first direction F1 simultaneously, so that the first release member 110X and the second release member 120X remain stationary; at the same time, when the first linkage member 142X moves up and down along the second direction F2, the first linkage member 142X can also drive the first release member 110X to rotate; and when the second linkage member 143X moves up and down along the second direction F2, the second linkage member 143X can also drive the second release member 120X to rotate.

[0078] In one embodiment, the operating member 130X has an initial position (see Figures 12 and 14) and an unlocked position (see Figures 13 and 15) when moving in the second direction F2. When the operating member 130X is in the initial position, it can be operated to move and push the first linkage 142X or the second linkage 143X to move. In other words, when the operating member 130X is in the initial position, there can be a gap or just contact between the first driving part 131X and the first abutting part 1421X and between the third driving part 133X and the third abutting part 1422X (or between the second driving part 132X and the second abutting part 1431X and between the fourth driving part 134X and the fourth abutting part 1432X) on the operating member 130X. In this way, the first linkage 142X (or the second linkage 143X) can be pushed or pressed upward by pushing or pressing the operating member 130X. When the operating element 130X is in the unlocked position, the operating element 130X pushes against the first linkage 142X or the second linkage 143X.

[0079] Referring to Figures 11 to 13, in one embodiment, the release mechanism 100X further includes a second elastic element 160X. The second elastic element 160X abuts between the trolley frame 1000X and the operating member 130X, providing an elastic restoring force to the operating member 130X to keep it in its initial position. The second elastic element 160X can also be an elastic element with elasticity, such as a spring or a sheet spring. Specifically, in this embodiment, as shown in Figures 9 and 11, the second elastic element 160X is a spring, and the operating member 130X is provided with a limiting post 135X. The spring is sleeved outside the limiting post 135X, and its two ends abut against the operating member 130X and the push handle tube 212X, respectively.

[0080] Referring to Figures 9 and 11, in one embodiment, one of the first unlocking member 110X and the trolley 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 side wall of the first stop recess 2121X. When the operating member 130X is switched to the unlocking position, the first stop protrusion 112X abuts against the corresponding other side wall of the first stop recess 2121X. This allows control of the rotation direction of the first unlocking member 110X, avoiding the problem that the first unlocking member 110X cannot pull the first locking member 510X away from the locking recess 521X when rotating due to not rotating in the preset direction. Furthermore, the distance between the two opposite sidewalls of the first stop recess 2121X defines the rotation range of the first stop protrusion 112X around the rotation center of the first release member 110X. Specifically, the push handle tube 212X is provided with the first stop recess 2121X, and the first release member 110X is provided with the first stop protrusion 112X. Similarly, one of the second release member 120X and the trolley frame 1000X is provided with the second stop recess 2122X, and the other is provided with the 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 release position, the second stop protrusion 122X abuts against the other sidewall of the second stop recess 2122X. This allows control over the rotation direction of the second release member 120X, preventing it from failing to pull the moving member 411X via the second traction member 430X when rotating due to deviations from the preset rotation direction. Furthermore, the distance between the two opposing sidewalls of the second stop recess 2122X defines the rotation range of the second stop protrusion 122X around the rotation center of the second release member 120X. Specifically, the push tube 212X is provided with the second stop recess 2122X, and the second release member 120X is provided with the second stop protrusion 122X.

[0081] 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 covers the top of the push handle tube 212X, and the second fixing cover 172X covers the bottom of the push handle tube 212X. The second fixing cover 172X has a through hole for the operating member 130X to pass through. The first fixing cover 171X and the second fixing cover 172X are connected and fixed to the push handle tube 212X. In this way, the operating member 130X and other components can be limited to prevent them from detaching from the push handle tube 212X. In addition, covering the first release member 110X, the second release member 120X, and the safety lock 140X with the first fixing cover 171X and the second fixing cover 172X simplifies and improves the appearance of the release mechanism 100X and the trolley frame 1000X. Specifically, as shown in Figure 6, the first fixed cover 171X is provided with an operation hole 1711X, and the toggle member 141X is provided with a pushing part 1411X. The pushing part 1411X can pass through the operation hole 1711X so that the user can hold it. The user can change the position of the toggle member 141X by pushing the pushing part 1411X.

[0082] Figures 16 and 17 illustrate a stroller frame 1000Y provided according to some embodiments of the present invention. The overall structure of the stroller frame 1000Y is generally symmetrical from left to right, and it can be used as a frame for a children's stroller, a pet stroller, or a cargo cart. For example, in this embodiment, the stroller frame 1000Y is used as a frame for a children's stroller to illustrate its structure and working principle.

[0083] Referring to Figures 16 to 18, in one embodiment, the trolley frame 1000Y may include, for example, a handlebar frame 100Y, a wheel frame 200Y, a reversing locking mechanism 300Y (see Figures 19 and 20), a folding locking mechanism 400Y (see Figures 19 and 20), and a release mechanism 500Y provided according to some embodiments of the present invention. Since the trolley frame 1000Y has a symmetrical structure, the following description will primarily focus on one side as an example, detailing the trolley frame 1000Y while simultaneously explaining the handlebar frame 100Y, wheel frame 200Y, reversing locking mechanism 300Y, folding locking mechanism 400Y, and release mechanism 500Y.

[0084] Referring again to Figures 16 to 18, in one embodiment, the handlebar 100Y is rotatably mounted on the wheel frame 200Y, allowing the handlebar 100Y to rotate relative to the wheel frame 200Y for reversal; or, the handlebar 100Y can rotate relative to the wheel frame 200Y for folding, enabling the cart frame 1000Y to switch between an unfolded state (see Figures 16 and 18) and a folded state (in other embodiments, the folded state may also be referred to as a folded state or a folded state) (see Figures 23 and 24). In one embodiment, as shown in Figures 16 to 18, the handlebar 100Y and the wheel frame 200Y are pivotally connected at a first pivot point A1, so that the handlebar 100Y has a first use position (see Figure 16) and a second use position (not shown in the figures) relative to the wheel frame 200Y. Specifically, the handlebar 100Y can pivot relative to the first pivot point A1, allowing the handlebar 100Y to switch between the first use position and the second use position. Considering the orientation of the trolley frame 1000Y, in this embodiment, when the trolley frame 100Y is in the first usage position, its top is located on the first side of the wheel frame 200Y. When the trolley frame 100Y is in the second usage position, its top is located on the second side of the wheel frame 200Y. The first and second sides are positioned opposite each other relative to the travel direction (i.e., the front-to-back direction) of the trolley frame 1000Y.

[0085] It should be noted that, unless otherwise explicitly specified and limited, the directional terms such as "left," "right," "front," and "rear" of the trolley frame 1000Y in various embodiments of the present invention are based on the "left," "right," "front," and "rear" positions of the trolley frame 1000Y when it is in its first use position and in normal driving. Furthermore, "left" and "right" are schematically indicated by arrows L and R, and "front" and "rear" are schematically indicated by arrows P and B in the figures. These directional terms are only used to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention.

[0086] Referring to Figures 16 and 17, in one embodiment, the frame 100Y has a U-shaped structure, including support tubes 110Y on the left and right sides and a pusher tube 120Y connecting the two support tubes 110Y. The support tubes 110Y are straight tubes, and the pusher tube 120Y is U-shaped and connected between the two support tubes 110Y, for the user to hold and push the trolley frame 1000Y. Specifically, the pusher tube 120Y is connected to the top of the support tubes 110Y, and the bottom of the support tubes 110Y is pivotally connected to the wheel frame 200Y at the first pivot point A1. Of course, in other embodiments, the support tubes 110Y may also be non-straight tubes, or the pusher tube 120Y may also be straight tubes; no specific limitations are made here.

[0087] 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, forming a second pivot point A2. The front wheel frame 210Y is located in front of the rear wheel frame 220Y along the front-rear direction of the trolley frame 1000Y. Wheels 270Y are connected to the bottom of both the front wheel frame 210Y and the bottom of the rear wheel frame 220Y. The first transmission member 230Y is pivotally connected between the rear wheel frame 220Y and the handlebar frame 100Y. Specifically, the first end of the first transmission member 230Y is pivotally connected to the handlebar frame 100Y, forming the aforementioned first pivot point A1, and the second end of the first transmission member 230Y is pivotally connected to the rear wheel frame 220Y, forming a third pivot point A3. Therefore, considering wheel frame 200Y, the aforementioned "first side" can be regarded as the side of rear wheel frame 220Y that is away from front wheel frame 210Y, and the "second side" can be regarded as the side of front wheel frame 210Y that is away from rear wheel frame 220Y.

[0088] In one embodiment, the stroller frame 1000Y also includes a seat assembly (not shown) mounted on the wheel frame 200Y for a child to sit on. When the handlebar 100Y is in the first use position (see Figures 16 and 18), if the user wants to move the stroller frame 1000Y by pushing it, the user must stand behind the stroller frame 1000Y to hold it, and in this case, the user stands with their back to the child's face. When the handlebar 100Y is in the second use position, if the user wants to move the stroller frame 1000Y by pushing it, the user must stand in front of the stroller frame 1000Y to hold it, and in this case, the user stands facing the child's face.

[0089] To prevent the rider frame 100Y from rotating arbitrarily relative to the wheel frame 200Y for reversing; in other words, to ensure the rider frame 100Y can be stably maintained in a first or second use position, in one embodiment, the rider frame 100Y and wheel frame 200Y can be restricted or allowed to rotate relative to the wheel frame 200Y for reversing operations by means of a reversing locking mechanism 300Y. Specifically, in this embodiment, to improve the stability of the reversing locking mechanism 300Y when locked, the trolley frame 1000Y is provided with two reversing locking mechanisms 300Y, respectively located on the left and right sides of the trolley frame 1000Y.

[0090] Referring to Figures 16, 19, and 20, in one embodiment, a reversing locking mechanism 300Y is disposed between the rider frame 100Y and the wheel frame 200Y. This 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 on the wheel frame 200Y around a first pivot point A1. The first locking member 310Y is disposed on the rider 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 rider frame 100Y is in a first operating position. When the first locking member 310Y engages with the second engaging member 330Y, the rider frame 100Y is in a second operating position.

[0091] Referring to Figures 19 to 22, in one embodiment, the first locking member 310Y has a locking portion 311Y, and both the first engaging member 320Y and the second engaging member 330Y are provided with a locking portion 301Y suitable for engaging with the locking portion 311Y. One of the locking portion 311Y and the locking portion 301Y can be a protrusion, and the other can be a groove; the protrusion and the groove can be locked together by a convex-concave interlocking mechanism. Specifically, the first locking member 310Y is movably disposed on the 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 locking portion 301Y to restrict the frame 100Y from switching between the first use position and the second use position. When the first locking member 310Y is in the first unlocking position, the locking portion 311Y disengages from the locking portion 301Y to allow the frame 100Y to switch between the first use position and the second use position. More specifically, the first locking member 310Y is a sliding sleeve structure, which is sleeved on the support tube 110Y of the frame 100Y and can slide along the length direction of the support tube 110Y so that it can move between the first locking position and the first unlocking position.

[0092] Referring 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 traction member 350Y. The first driving member 340Y is movably mounted on the rider frame 100Y and connected to the first locking member 310Y, while the first traction member 350Y is connected to the first driving member 340Y. Thus, the first driving member 340Y can be moved by the first traction member 350Y, thereby causing the first locking member 310Y to move. Specifically, in this embodiment, both the first driving member 340Y and the first traction member 350Y are movably mounted within the inner cavity of the rider frame 100Y. 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) passing through the rider frame 100Y. It should be noted that since both the support tube 110Y and the pusher tube 120Y are hollow tubular structures, the "inner cavity of the frame 100Y" can refer to the tubular inner cavity of the support tube 110Y and / or the pusher tube 120Y. By placing the first drive component 340Y and the first traction component 350Y within the inner cavity of the frame 100Y, not only is space utilization improved, but the appearance of the frame 100Y is also made neater and more aesthetically pleasing.

[0093] In one embodiment, as shown in Figures 21 and 22, a fixed support seat 130Y is provided in the inner cavity of the rider frame 100Y. Specifically, the fixed support seat 130Y is disposed within the support tube 110Y and is used to support the first drive member 340Y. In one embodiment, the reversing locking mechanism 300Y further includes a first reset member 370Y, which may be, for example, a spring or a spring-like resetting member. The first reset member 370Y abuts between the first drive member 340Y and the fixed support seat 130Y, and is used to drive the first drive member 340Y to reset, so that the first drive member 340Y constantly has a tendency to drive the first locking member 310Y to the first locked position. Thus, when the tension on the first traction member 350Y is no longer present, the first drive member 340Y can automatically reset under the reset force of the first reset member 370Y and drive the first locking member 310Y to move to the first locked position.

[0094] In one embodiment, when the handframe 100Y is pivoted around the first pivot point A1, the handframe 100Y also has a third usage position relative to the wheel frame 200Y. Specifically, as shown in Figures 16 and 18, when the handframe 100Y is in the first usage position, the handframe 100Y and the wheel frame 200Y are separated from each other around the first pivot point A1, so that the trolley frame 1000Y is in an extended state. As shown in Figures 23 and 24, when the handframe 100Y is in the third usage position, the handframe 100Y and the wheel frame 200Y are brought closer together around the first pivot point A1, so that the trolley frame 1000Y is in a folded state.

[0095] Referring to Figures 16, 19, 20, and 25, in one embodiment, the wheel frame 200Y further includes a handrail 240Y, a second transmission member 250Y, and a third transmission member 260Y. Specifically, the tops of the front wheel frame 210Y and the rear wheel frame 220Y are pivotally connected to the handrail 240Y, forming the aforementioned second pivot point A2 on the handrail 240Y. The first end of the second transmission member 250Y is pivotally connected to the front wheel frame 210Y, forming a fourth pivot point A4. The second end of the second transmission member 250Y extends towards the rear wheel frame 220Y and is pivotally connected to the first end of the third transmission member 260Y, forming a fifth pivot point A5. The second end of the third transmission member 260Y is pivotally connected to the handrail 240Y, forming a sixth pivot point A6. The second transmission component 250Y can be used to support the aforementioned seat assembly. When a child sits on the seat assembly, their arms can be placed on the armrest component 240Y. This not only improves the comfort of sitting, but also restricts the child's sitting space, preventing the child from falling off the seat assembly.

[0096] Specifically, referring to Figures 19, 20, and 25, in this embodiment, the third transmission component 260Y and the frame 100Y are arranged parallel to each other in the left-right direction and are located on the left and right sides of the first transmission component 230Y, respectively. The first end of the third transmission component 260Y passes through the first transmission component 230Y and is fixedly connected to the 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 component 260Y and the frame 100Y is coaxially arranged with the first pivot point A1. In addition, the pivot point (i.e., the fifth pivot point A5) between the second transmission component 250Y and the third transmission component 260Y is coaxially arranged with the first pivot point A1.

[0097] Referring to Figures 16, 17, 19, and 20, in this embodiment, when the handrail 100Y is fixed relative to the first transmission member 230Y, the third transmission member 260Y is also relatively fixed to the first transmission member 230Y. That is, the third transmission member 260Y cannot rotate around the first pivot point A1. In this way, the handlebar 240Y, the rear wheel frame 220Y, the first transmission member 230Y, and the third transmission member 260Y remain relatively fixed. At the same time, the third transmission member 260Y is also relatively fixed to the second transmission member 250Y. The second transmission member 250Y can be stably supported between the front wheel frame 210Y and the rear wheel frame 220Y. Therefore, the trolley frame 1000Y can be stably maintained in the unfolded state. When the handframe 100Y rotates relative to the first transmission member 230Y around the first pivot point A1, the handframe 100Y can drive the third transmission member 260Y to rotate simultaneously around the fifth pivot point A5 and the sixth pivot point A6 via the fixing member. During this process, the handframe 100Y can also push the first transmission member 230Y to pivot around the third pivot point A3; simultaneously, the third transmission member 260Y can also drive the handlebar member 240Y to rotate around the second pivot point A2, and at the same time push the second transmission member 250Y to pivot around the fourth pivot point A4, so that the front wheel frame 210Y and the rear wheel frame 220Y rotate relative to the second pivot point A2, ultimately realizing the folding of the trolley frame 1000Y. For details regarding the folding process of the trolley frame 1000Y, please refer to the following description.

[0098] To prevent the rider frame 100Y from rotating arbitrarily relative to the wheel frame 200Y for retraction, in other words, to ensure the rider frame 100Y can be stably maintained in a first or third use position, in one embodiment, the rider frame 100Y and wheel frame 200Y can be restricted or allowed to rotate relative to the wheel frame 200Y for retraction by a retraction locking mechanism 400Y. Specifically, in this embodiment, to improve the stability of the retraction locking mechanism 400Y when locked, the trolley frame 1000Y is provided with two retraction locking mechanisms 400Y, located on the left and right sides of the trolley frame 1000Y respectively.

[0099] Referring to Figures 19 and 20, in one embodiment, a retraction locking mechanism 400Y is disposed between the rider frame 100Y and the wheel frame 200Y. The retraction locking mechanism 400Y includes a second locking member 410Y, which is movable relative to the rider frame 100Y and has a second locked position and a second unlocked 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 rider frame 100Y, which is not specifically limited here. Specifically, when the second locking member 410Y moves to the second locked position, the second locking member 410Y engages with the first transmission member 230Y (see Figure 19). In this way, the pivoting of the third transmission member 260Y relative to the first transmission member 230Y is restricted, as is the pivoting of the rider frame 100Y relative to the first transmission member 230Y, ultimately restricting the switching of the rider frame 100Y 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 Figure 20). This allows the third transmission member 260Y to pivot relative to the first transmission member 230Y, and also allows the rider frame 100Y to pivot relative to the first transmission member 230Y, ultimately allowing the rider frame 100Y to switch between the first use position and the third use position.

[0100] In one embodiment, the first transmission member 230Y has a first recess (not shown) and a second recess (not shown). Specifically, both the first and second recesses are located at the end of the first transmission member 230Y near the first pivot point A1, and are arranged approximately circumferentially opposite to each other along the first pivot point A1. When the trolley frame 1000Y is in the unfolded state, the second locking member 410Y engages with the first recess (see Figure 19) to keep the trolley frame 1000Y in the unfolded state. When the trolley frame 1000Y is in the folded state, the second locking member 410Y engages with the second recess (see Figure 26) to keep the trolley frame 1000Y in the folded state, preventing the trolley frame 1000Y from accidentally unfolding during transport or storage.

[0101] Referring to Figures 19, 20, 27, and 28, in one embodiment, the retraction locking mechanism 400Y further includes a second driving element 420Y and a second traction member 430Y. The second driving element 420Y is movably mounted on the frame 100Y and drives the second locking member 410Y. The second traction member 430Y is connected to the second driving element 420Y. Thus, the second driving element 420Y can be moved by the second traction member 430Y, thereby moving the second locking member 410Y. Specifically, the second driving element 420Y includes a second sliding sleeve 421Y and a second driving member 422Y. The second sliding sleeve 421Y is sleeved on the support tube 110Y of the frame 100Y and can slide along the length of the support tube 110Y. The second sliding sleeve 421Y can abut against or connect with the second locking member 410Y. The second driving member 422Y is movably mounted on the fixed support 130Y within the inner cavity of the frame 100Y, and is connected to the second sliding sleeve 421Y via a second connecting member 450Y (such as a shaft or pin) passing through the frame 100Y. The second traction member 430Y is movably mounted within the inner cavity of the frame 100Y and is connected to the second driving member 422Y. When the second traction member 430Y moves, it can drive the second driving member 422Y to move the second sliding sleeve 421Y, thereby driving the second locking member 410Y to move from the second locked position to the second unlocked position.

[0102] Referring to Figures 19, 20, 27, and 28, in one embodiment, the closing and locking mechanism 400Y further includes a second reset member 440Y and a fifth reset member (not shown in the figures). Both the second reset member 440Y and the fifth reset member can be elastic resetting components such as springs or sheet elements. As shown in Figures 27 and 28, the second reset member 440Y abuts against the second driving member 422Y and the fixed support 130Y, driving the second driving member 422Y to reset. The fifth reset member provides an elastic restoring force biased towards the second locking position for the second locking member 410Y. 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 resets to drive the second sliding sleeve 421Y to reset, the second sliding sleeve 421Y will separate from the second locking member 410Y. Under the elastic restoring force of the fifth resetting member, the second locking member 410Y can automatically move from the second unlocking position to the second locking position. In this way, when the tension on the second traction member 430Y no longer exists, the second driving member 422Y can automatically reset under the reset force of the second reset member 440Y and drive the second sliding sleeve 421Y to reset to disengage from the second locking member 410Y. Under the reset force of the fifth reset member, the second locking member 410Y can automatically move to the second locking position.

[0103] The following diagrams briefly illustrate the folding process of the 1000Y stroller frame.

[0104] Referring to Figures 16, 17, 19, and 20, in this embodiment, when the trolley frame 1000Y is in the unfolded 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 restrict the third transmission member 260Y and the handlebar frame 100Y from rotating around the first pivot point A1 relative to the first transmission member 230Y. At the same time, it restricts 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 linkage structure with the third transmission member 260Y, the handlebar member 240Y, and the rear wheel frame 220Y. The second transmission member 250Y can also be stably supported between the front wheel frame 210Y and the rear wheel frame 220Y, so that the trolley frame 1000Y remains in the unfolded state. Specifically, the links 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 linkage structure, with two adjacent and connected links being relatively fixed to each other.

[0105] When the trolley frame 1000Y needs to be switched from the unfolded state to the folded state, the second locking member 410Y is driven to move to the second unlocking position, so that the second locking member 410Y retracts from the first recess of the third transmission member 260Y. In this way, both the trolley frame 100Y and the third transmission member 260Y can rotate counterclockwise relative to the first transmission member 230Y about the first pivot point A1. When both the trolley frame 100Y and the third transmission member 260Y can rotate relative to the first transmission member 230Y, a movable four-bar linkage is formed between the handlebar member 240Y, the rear wheel frame 220Y, the first transmission member 230Y, and the third transmission member 260Y (or the trolley frame 100Y), and two adjacent and connected links can pivot relative to each other. In this way, the retraction of the rider frame 100Y relative to the wheel frame 200Y and the retraction of the wheel frame 200Y itself can be achieved through the movable four-bar linkage structure (i.e., the relative retraction of components such as the front wheel frame 210Y, the rear wheel frame 220Y, and the handlebar 240Y).

[0106] Specifically, please refer to Figures 19 and 20. During the folding process, when both the handlebar 100Y and the third transmission member 260Y can rotate counterclockwise relative to the first transmission member 230Y around the first pivot point A1, the handlebar 100Y will drive the second end of the first transmission member 230Y to rotate clockwise around the third pivot point A3. Simultaneously, the third transmission member 260Y will rotate counterclockwise around the sixth pivot point A6 to drive the handlebar 240Y to rotate clockwise around the second pivot point A2 to approach the rear wheel frame 220Y for folding. In addition, when the third transmission member 260Y rotates around the first pivot point A1 (or the fifth pivot point A5), the third transmission member 260Y will also drive the first end of the second transmission member 250Y to rotate clockwise around the fourth pivot point A4 to pull 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 trolley frame 100Y is in the retracted state, the second recess on the second transmission member 250Y is opposite to the second locking member 410Y. When the second driving member 422Y is activated by the second reset member 440Y, the second sliding sleeve 421Y can be reset and separated from the second locking member 410Y. Thus, under the elastic resetting force of the fifth resetting member, the second locking member 410Y can move to the second locking position to extend into the second recess for locking, thereby restricting the unfolding of the trolley frame 1000Y.

[0107] To improve the convenience for users in releasing the reversing locking mechanism 300Y and the retracting locking mechanism 400Y, in some embodiments of the present invention, the release mechanism 500Y can perform release operations on both the reversing locking mechanism 300Y and the retracting locking mechanism 400Y. Specifically, the release mechanism 500Y can be driven connected to both the reversing locking mechanism 300Y and the retracting locking mechanism 400Y to allow the rider 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 rider frame 100Y. More specifically, it is disposed on the push handle tube 120Y of the rider frame 100Y, thus facilitating user operation. Of course, in other embodiments, the release mechanism 500Y can also be disposed on the support rod or the wheel frame 200Y, without specific limitations.

[0108] 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 rider frame 100Y and drivenly connected to the reversing locking mechanism 300Y to allow the rider frame 100Y to rotate relative to the wheel frame 200Y for reversing. Specifically, the first release member 510Y is drivenly connected to the first driving member 340Y in the reversing locking mechanism 300Y. The second release member 520Y is drivenly connected to the second driving member 422Y in the retraction locking mechanism 400Y to allow the rider frame 100Y to rotate relative to the wheel frame 200Y for retraction. Specifically, the second release member 520Y is rotatably mounted on the rider frame 100Y and drivenly connected to the retraction locking mechanism 400Y. The operating element 530Y is movably mounted on the rider frame 100Y and selectively drives the first release element 510Y or the second release element 520Y to rotate. It should be noted that in other embodiments, the first release element 510Y may also be driven to connect with the retraction locking mechanism 400Y, and the second release element 520Y may be driven to connect with the reversing locking mechanism 300Y; no specific limitations are imposed here.

[0109] Since the first release member 510Y is rotatably mounted on the frame 100Y and drivenly connected to the first drive member 340Y, and the second release member 520Y is rotatably mounted on the frame 100Y and drivenly 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, the user can control the rotation of the first release member 510Y by driving the operation member 530Y, thereby indirectly controlling the first drive member 340Y and the first locking member 310Y in the closing and locking mechanism 400Y. When the first locking member 310Y is in the first locked position, the locking part 311Y of the first locking member 310Y engages and locks with the locking part 301Y of the first engaging member 320Y or the second engaging member 330Y, and the frame 100Y can be maintained in the first use position or the second use position. When the first locking member 310Y is in the first unlocking position, the locking part 311Y of the first locking member 310Y disengages from the locking part 301Y of the first engaging member 320Y or the second engaging member 330Y to release the lock, allowing the cart 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 moving the drive operating member 530Y, thereby indirectly controlling the second drive element 420Y and the second locking member 410Y in the retraction locking mechanism 400Y. When the second locking member 410Y is in the second locking position, the cart frame 1000Y is restricted to switching between the unfolded and retracted states; that is, the cart frame 1000Y can remain in either the unfolded or retracted state. When the second locking member 410Y is in the second unlocking position, the cart frame 1000Y is allowed to switch between the unfolded and retracted states. Because users only need to operate the aforementioned release mechanism 500Y to control different locking mechanisms, the ease of operation for users is improved.

[0110] Referring to Figures 21 and 28 to 32, in one embodiment, both the first release member 510Y and the second release member 520Y can be disc-shaped, and both are rotatably mounted on the push tube 120Y of the handframe 100Y via a shaft or pin. Specifically, a mounting base 140Y is provided inside the push tube 120Y, and the first release member 510Y and the second release member 520Y are rotatably mounted on the mounting base 140Y. The first release member 510Y is provided with a first connecting portion 511Y, which is offset from the rotation center of the first release member 510Y. For example, it can be arranged in a straight line or in a non-linear shape, but it is not limited thereto. 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 a first traction member 350Y. When the operating member 530Y drives the first unlocking member 510Y to rotate around its rotation center, the first connecting part 511Y will rotate synchronously around the rotation center of the first unlocking member 510Y, thereby driving the first traction member 350Y to move and pull the first driving member 340Y to move, ultimately driving the first locking member 310Y to move from the first locked position to the first unlocked position. Similarly, the second unlocking member 520Y is provided with a second connecting part 521Y. The rotation centers of the second connecting part 521Y and the second unlocking member 520Y are offset, for example, they can be arranged in a straight line or in a non-linear shape, but are not limited thereto. The second connecting part 521Y is used to connect the closing locking mechanism 400Y. Specifically, the second connecting part 521Y is connected to the second driving element 420Y (specifically the second driving element 422Y) through 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 part 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 driving element 420Y to move, and finally pushing or driving the second locking member 410Y to move from the second locking position to the second release position.

[0111] Specifically, in this embodiment, as shown in Figures 21 and 28, both the first traction member 350Y and the second traction member 430Y can be, for example, traction ropes. More specifically, the first release member 510Y has two first connecting portions 511Y, and the second release member 520Y has two second connecting portions 521Y. The two first connecting portions 511Y are respectively connected to the two first traction members 350Y, and the two second connecting portions 521Y are respectively connected to the two second traction members 430Y. In this way, when the first release member 510Y rotates, the two reversing locking mechanisms 300Y can be released simultaneously. When the second release member 520Y rotates, the two closing locking mechanisms 400Y can be released simultaneously.

[0112] Please refer to Figures 21, 28, and 32. In one embodiment, the release mechanism 500Y further includes a safety lock 540Y. This safety lock 540Y is movably mounted on the rider frame 100Y and can switch 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 connected to 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 connected to the second release member 520Y via the safety lock 540Y. Specifically, when the user needs to release the reversing locking mechanism 300Y to change the operating direction of the rider frame 100Y, the safety lock 540Y can be moved to the first position. Thus, by operating the operating member 530Y, the first release member 510Y can be rotated. When the user needs to release the locking mechanism 400Y so that the trolley frame 1000Y can switch between the extended and retracted states, 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.

[0113] Referring again to Figures 21, 28 to 32, in one embodiment, the safety lock 540Y includes a first linkage 541Y, a second linkage 542Y, and a toggle member 543Y. The first linkage 541Y is driven to the first release member 510Y; the second linkage 542Y is driven to the second release member 520Y; and the toggle member 543Y is connected to both the first linkage 541Y and the second linkage 542Y. The toggle member 543Y is movably mounted on the rider frame 100Y and can switch between a first position and a second position to move the first linkage 541Y and the second linkage 542Y along a first direction F1. Specifically, when the toggle member 543Y is in the first position, the operating member 530Y is operated to push the first linkage member 541Y to move along the second direction F2, thereby causing the first release member 510Y to rotate; when the toggle member 543Y is in the second position, the operating member 530Y is operated to push the second linkage member 542Y to move along the second direction F2, thereby causing the second release member 520Y to rotate, and the first direction F1 and the second direction F2 intersect.

[0114] Referring again to Figures 21, 28 to 32, in one embodiment, the first linkage 541Y has a first abutment portion 5411Y, and the second linkage 542Y has a second abutment portion 5421Y. The operating member 530Y has a first driving portion 531Y and a second driving portion 532Y spaced apart. When the actuating member 543Y is in the first position, the first abutment portion 5411Y is located opposite the first driving portion 531Y, and the second abutment portion 5421Y is misaligned with the second driving portion 532Y. Thus, when the operating member 530Y moves upward along the second direction F2, the first driving portion 531Y can abut against the first abutment portion 5411Y, thereby pushing the first linkage 541Y to move along the second direction F2, thereby driving the first unlocking member 510Y to rotate, and finally realizing the unlocking of the reversing locking mechanism 300Y. Meanwhile, because the second abutment portion 5421Y and the second drive portion 532Y are misaligned, when the operating member 530Y moves upward along the second direction F2, the second drive portion 532Y will not contact the second abutment portion 5421Y. This allows both the second linkage member 542Y and the second release member 520Y to remain stationary, meaning that when the operating member 530Y is operated, it will not affect the closing and locking mechanism 400Y. Similarly, when the actuating member 543Y is in the second position, the second abutment portion 5421Y is positioned opposite the second drive portion 532Y, and the first abutment portion 5411Y is misaligned with the first drive portion 531Y. Thus, when the operating member 530Y moves upward along the second direction F2, the second drive portion 532Y can abut against the second abutment portion 5421Y, thereby pushing the second linkage member 542Y to move along the second direction F2, which in turn drives the second release member 520Y to rotate, ultimately releasing the closing and locking mechanism 400Y. At the same time, since the first abutting part 5411Y and the first driving part 531Y are misaligned, when the operating member 530Y moves upward along the second direction F2, the first driving part 531Y will not contact the first abutting part 5411Y, thereby allowing the first linkage member 541Y and the first unlocking member 510Y to remain stationary. That is, when the operating member 530Y is operated, it will not affect the closing and locking mechanism 400Y.

[0115] 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 linkage member 541Y and the second linkage member 542Y are spaced apart, and a third clearance portion 544Y is formed between them. Specifically, the first linkage member 541Y also has a third abutting portion 5412Y, and the second linkage member 542Y also has a fourth abutting portion 5422Y. When the toggle member 543Y is in the first position, the third abutting portion 5412Y is located opposite the third driving portion 533Y, the first abutting portion 5411Y is located opposite the first driving portion 531Y, and the fourth driving portion 534Y is located opposite the third clearance portion 544Y. Therefore, when the operating member 530Y moves upward along the second direction F2, the first driving part 531Y abuts against the first abutting part 5411Y, and the third abutting part 5412Y abuts against the third driving part 533Y, thereby simultaneously pushing the first linkage member 541Y to move along the second direction F2. At the same time, as the operating member 530Y moves upward along the second direction F2, the fourth driving part 534Y gradually inserts into the third clearance part 544Y, preventing the second linkage member 542Y from moving when the toggle member 543Y is in the first position. Similarly, when the toggle member 543Y is in the second position, the fourth abutting part 5422Y is positioned opposite the fourth driving part 534Y, the second abutting part 5421Y is positioned opposite the second driving part 532Y, and the third driving part 533Y is positioned opposite the third clearance part 544Y. Therefore, when the operating member 530Y moves upward along the second direction F2, the second driving part 532Y can abut against the second abutting part 5421Y, and the fourth abutting part 5422Y can abut against the fourth driving part 534Y, thereby simultaneously pushing the second linkage member 542Y to move along the second direction F2. At the same time, as the operating member 530Y moves upward along the second direction F2, the third driving part 533Y gradually inserts into the third clearance part 544Y, preventing the first linkage member 541Y from moving when the toggle member 543Y is in the second position.

[0116] 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 actuating 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 portion 532Y. When the actuating 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 portion 531Y.

[0117] Referring to Figures 21, 28, and 29, in one embodiment, the release mechanism 500Y further includes a third reset member 550Y, which can be an elastic element such as a spring or sheet. The third reset member 550Y abuts against the handlebar frame 100Y (e.g., pusher tube 120Y) and the actuating member 543Y, providing an elastic restoring force to the actuating member 543Y to keep it in the first or second position. For example, in this embodiment, the third reset member 550Y is used to constantly keep the actuating member 543Y in the first position. If the release mechanism 300Y is required, the operating member 530Y can be operated directly (e.g., pressed or pushed upwards). If the release mechanism 400Y is required, the actuating member 543Y must first be moved to the second position before operating the operating member 530Y. After the locking mechanism 400Y is released, the actuating element 543Y is released. Under the reset action of the third reset element 550Y, the actuating element 543Y automatically resets to the first position.

[0118] In one embodiment, one of the first linkage 541Y and the first release member 510Y has a first guide recess (not shown in the figure), and the other has a first mating protrusion (not shown in the figure). The first mating protrusion is slidably disposed within the first guide recess, and the first guide recess extends along a first direction F1. Similarly, one of the second linkage 542Y and the second release member 520Y has a second guide recess (not shown in the figure), and the other has a second mating protrusion (not shown in the figure). The second mating protrusion is slidably disposed within the second guide recess, and the second guide recess extends along a first direction F1. Thus, when the actuating member 543Y switches between the first position and the second position along the first direction F1, it can drive the first linkage member 541Y and the second linkage member 542Y to move left and right along the first direction F1 simultaneously, so that the first release member 510Y and the second release member 520Y remain stationary; at the same time, when the first linkage member 541Y moves up and down along the second direction F2, the first linkage member 541Y can also drive the first release member 510Y to rotate; and when the second linkage member 542Y moves up and down along the second direction F2, the second linkage member 542Y can also drive the second release member 520Y to rotate.

[0119] 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 linkage 541Y or the second linkage 542Y to move. In other words, when the operating member 530Y is in the initial position, there can be a gap or just enough contact between the first driving part 531Y and the first abutting part 5411Y, and between the third driving part 533Y and the third abutting part 5412Y (or between the second driving part 532Y and the second abutting part 5421Y, and between the fourth driving part 534Y and the fourth abutting part 5422Y) on the operating member 530Y. This allows the first linkage member 541Y (or the second linkage member 542Y) to move upwards by pushing or pressing the operating member 530Y. When the operating member 530Y is in the unlocked position, it pushes against the first linkage member 541Y or the second linkage member 542Y.

[0120] Specifically, as shown in Figures 21, 22, 28, and 32, when the actuating member 543Y is in the first position and the operating member 530Y is in the initial position, there may be a gap or just contact between the first driving part 531Y and the first abutting part 5411Y, and between the third driving part 533Y and the third abutting part 5412Y. At this time, the operating member 530Y can be pushed upwards or pressed to move to the unlocked position, and in the process, it pushes against the first linkage member 541Y, causing the first linkage member 541Y to drive the first unlocking member 510Y to rotate. When the actuating member 543Y is in the second position and the operating member 530Y is in the initial position, there may be a gap or just contact between the second driving part 532Y and the second abutting part 5421Y, and between the fourth driving part 534Y and the fourth abutting part 5422Y. At this time, the operating member 530Y can be pushed or pressed upward to move to the unlocked position, and in the process, it pushes against the second linkage member 542Y, so that the second linkage member 542Y drives the second release member 520Y to rotate.

[0121] Referring to Figures 21 and 29, in one embodiment, the release mechanism 500Y further includes a fourth reset member 560Y, which may be an elastic element such as a spring or a sheet. The fourth reset member 560Y abuts between the mounting base 140Y of the handlebar frame 100Y and the operating member 530Y, and provides an elastic restoring force to the operating member 530Y to keep the operating member 530Y in its initial position.

[0122] 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 covers the top of the push handle tube 120Y, and the second fixing cover 572Y covers the bottom of the push handle tube 120Y. The second fixing cover 572Y has a through hole for the operating member 530Y to pass through. The first fixing cover 571Y and the second fixing cover 572Y are connected and fixed to the push handle tube 120Y. In this way, the operating member 530Y and other components can be limited to prevent them from detaching from the push handle tube 120Y. In addition, by covering the first release member 510Y, the second release member 520Y, and the safety lock 540Y with the first fixing cover 571Y and the second fixing cover 572Y, the release mechanism 500Y and the trolley frame 1000Y can be simplified and aesthetically improved. Specifically, as shown in Figure 21, the first fixed cover 571Y is provided with an operation hole 5711Y, and the toggle member 543Y is provided with a pushing part 5431Y. The pushing part 5431Y can pass through the operation hole 5711Y so that the user can hold it. The user can change the position of the toggle member 543Y by pushing the pushing part 5431Y.

[0123] The aforementioned trolley frame 1000Y and its locking mechanism 500Y have the following technical advantages:

[0124] The aforementioned trolley frame 1000Y includes a release mechanism 500Y. In the release mechanism 500Y, a first release member 510Y is rotatably mounted on the trolley frame 1000Y and drivenly connected to a reversing locking mechanism 300Y; a second release member 520Y is rotatably mounted on the trolley frame 1000Y and drivenly connected to a closing 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 handframe 100Y to rotate relative to the wheel frame 200Y for reversing direction, and the closing locking mechanism 400Y allows the handframe 100Y to rotate relative to the wheel frame 200Y for closing. Therefore, the user can control the rotation of the first release member 510Y by moving the drive member 530Y, thereby indirectly controlling the reversing locking mechanism 300Y, so that the handlebar 100Y of the trolley frame 1000Y can be reversed. Simultaneously, the user can also control the rotation of the second release member 520Y by moving the drive member 530Y, thereby indirectly controlling the retraction locking mechanism 400Y, so that the trolley frame 1000Y can switch between the extended and retracted states. Because the user only needs to operate the aforementioned release mechanism 500Y to control the different locking mechanisms, the ease of operation for the user is improved.

[0125] Figure 33 shows a stroller frame 1000Z provided according to a first embodiment of the present invention. The overall structure of the stroller frame 1000Z is generally symmetrical from left to right, and it can be used as a frame for a children's stroller, a pet stroller, or a cargo cart. For example, in this embodiment, the stroller frame 1000Z is used as a frame for a children's stroller to illustrate its structure and working principle.

[0126] Referring to Figure 33, in one embodiment, the trolley frame 1000Z may include, for example, a handlebar frame 100Z, a wheel frame 200Z, a wheel seat 230Z, and a release mechanism 300Z provided according to an embodiment of the present invention. Since the trolley frame 1000Z has a symmetrical structure, the following description will primarily focus on one side as an example. While describing the trolley frame 1000Z in detail, the handlebar frame 100Z, wheel frame 200Z, wheel seat 230Z, and release mechanism 300Z will also be explained.

[0127] 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 entire trolley frame 1000Z has a folded state (in other embodiments, the folded state may also be referred to as a folded state or a folded state) (see Figure 35) and an unfolded state (see Figure 33). Specifically, the handlebar frame 100Z includes an upper handlebar 110Z and a lower handlebar 120Z that are movable relative to each other, and the end of the lower handlebar 120Z away from the upper handlebar 110Z is pivotally connected to the wheel frame 200Z. The wheel frame 200Z includes a pivotally connected front wheel frame 210Z and a rear wheel frame 220Z, wherein the lower handlebar 120Z, the front wheel frame 210Z, and the rear wheel frame 220Z can be pivotally connected via a first pivot seat 400Z. When the trolley frame 1000Z switches from the extended state to the retracted state, the front wheel frame 210Z pivots around the first pivot seat 400Z to approach the rear wheel frame 220Z, and the lower handle 120Z pivots around the first pivot seat 400Z to approach the rear wheel frame 220Z. When the trolley frame 1000Z switches from the retracted state to the extended state, the front wheel frame 210Z pivots around the first pivot seat 400Z to move away from the rear wheel frame 220Z, and the lower handle 120Z pivots around the first pivot seat 400Z to move away from the rear wheel frame 220Z. Specifically, when the trolley frame 1000Z is in the extended 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 handle 120Z and the rear wheel frame 220Z. When the trolley frame 1000Z is in the folded state, a third included angle α3 is formed between the front wheel frame 210Z and the rear wheel frame 220Z, and a fourth included angle α4 is formed between the lower handrail 120Z and the rear wheel frame 220Z. Where α1>α3, α2>α4 (refer to 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.

[0128] Referring to Figure 33, in one embodiment, the front wheel frame 210Z has, for example, a U-shaped structure, including front rods 211Z located on the left and right sides and a front crossbar 212Z connecting 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 the frame of a children's stroller, the front crossbar 212Z can also be used as a foot pedal.

[0129] In one embodiment, at least one wheel seat 230Z (hereinafter referred to as front wheel seat 230AZ) is mounted on the bottom of the front wheel frame 210Z. Specifically, in this embodiment, as shown in FIG33, two front wheel seats 230AZ are mounted on the bottom of the front wheel frame 210Z, and the two front wheel seats 230AZ are spaced apart in the left-right direction (i.e., the first direction F1). More specifically, the two front wheel seats 230AZ are fixedly mounted on the left and right ends of the front crossbar 212Z, and each front wheel seat 230AZ is used to mount a wheel 240Z (hereinafter referred to as front wheel 240ZA). Of course, in another alternative embodiment, the front wheel frame 210Z may also have other implementation methods, such as the front wheel frame 210Z including only two front rods 211Z, one end of the two front rods 211Z being connected to form a V-shaped structure, and a front wheel seat 230AZ being mounted centrally on the bottom of the front wheel frame 210Z. Alternatively, for example, the front wheel frame 210Z may consist of only two front struts 211Z arranged roughly parallel to each other in the left-right direction, and the two front wheel seats 230AZ may be connected to the two front struts 211Z respectively.

[0130] It should be noted that, unless otherwise explicitly specified and limited, the directional terms such as "left" and "right" in the various embodiments of the present invention refer to the "left" and "right" orientations of the trolley frame 1000Z during normal operation, and are schematically indicated by arrows L and R in the figures. These directional terms are only used to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention.

[0131] Referring to Figure 33, in one embodiment, the rear wheel carrier 220Z may also be a U-shaped structure, including two rear struts 221Z located on the left and right sides, and a rear crossbar 222Z connected between the two rear struts 221Z. The rear crossbar 222Z extends along the first direction F1. At least one wheel seat 230Z (hereinafter referred to as rear wheel seat 230BZ) is also mounted on the bottom of the rear wheel carrier 220Z. In this embodiment, two rear wheel seats 230BZ are mounted on the bottom of the rear wheel carrier 220Z, and the two rear wheel seats 230BZ are 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 struts 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 strut 221Z on the same side) via a connecting shaft. Of course, in another alternative embodiment, the rear wheel frame 220Z can have other implementations. For example, the rear wheel frame 220Z may only include two rear struts 221Z, with one end of the two struts 221Z connected to form a V-shape, and a rear wheel seat 230BZ may be centrally mounted at the bottom of the rear wheel frame 220Z. Alternatively, for example, the rear wheel frame 220Z may only include two rear struts 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 struts 221Z.

[0132] Referring to Figures 33 and 34, in one embodiment, the trolley frame 1000Z further includes a wheel locking mechanism 500Z, which is disposed between the wheel frame 200Z and the wheel seat 230Z. The wheel locking mechanism 500Z is used 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 used 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, the steering of the trolley frame 1000Z is locked, and the trolley frame 1000Z can 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 is rotatable relative to the rear wheel frame 220Z. In this way, the trolley frame 1000Z can perform steering and drifting operations, which improves the flexibility of the trolley frame 1000Z in movement.

[0133] Referring to Figure 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 adapted to lock into the first locking recess 520Z. Specifically, when the first locking member 510Z extends into the first locking recess 520Z to lock into 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 restricting the drifting and steering of the trolley frame 1000Z. When the first locking member 510Z retracts from the first locking recess 520Z to disengage from 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 trolley frame 1000Z to drift and turn.

[0134] Referring to Figure 34, in one embodiment, the wheel locking mechanism 500Z further includes a second reset member 530Z. The second reset member 530Z abuts between the rear wheel carrier 220Z and the first locking member 510Z, and provides an elastic restoring force to the first locking member 510Z so that the first locking member 510Z always has a tendency to extend into the first locking recess 520Z. The second reset member 530Z can be, for example, an elastic component such as a spring or a sheet spring.

[0135] It should be noted that, in this embodiment, in order to further improve the steering flexibility of the trolley frame 1000Z, the trolley frame 1000Z is provided with two wheel locking mechanisms 500Z, and the aforementioned wheel locking mechanism 500Z is provided between the rear rod 221Z and the rear wheel seat 230BZ on the same side.

[0136] Referring to Figures 33 and 34, in one embodiment, the upper handle 110Z is movable relative to the lower handle 120Z. For example, the upper handle 110Z can be slidably engaged with the lower handle 120Z. This allows adjustment of the overall height of the handle 100Z relative to the ground when the trolley frame 1000Z is in the unfolded state, facilitating gripping by users of different heights and improving the applicability of the trolley frame 1000Z. In one embodiment, the upper handle 110Z has a U-shaped structure, including two first support tubes 111Z and a push handle tube 112Z connected between the two first support tubes 111Z. The first support tubes 111Z are straight tubes, and the push handle tube 112Z has a U-shaped structure and is connected between the two first support tubes 111Z, providing a grip for the user to push the trolley frame 1000Z. More specifically, the scaffolding 120Z includes, for example, two second support tubes 121Z. The upper ends of the two second support tubes 121Z are respectively slidably sleeved with the lower ends of the first support tube 111Z on the same side, and the lower ends of the two second support tubes 121Z are respectively pivotally sleeved with the first pivot seat 400Z on the same side. It should be noted that the slidable sleeve of the two second support tubes 121Z with the first support tube 111Z on the same side includes two implementations: the second support tube 121Z is sleeved outside the first support tube 111Z; or the first support tube 111Z is sleeved outside the second support tube 121Z. Specifically, in this embodiment, the principle of their cooperation is specifically explained by taking the example of the second support tube 121Z being sleeved outside the first support tube 111Z. In addition, it should be noted that the above-mentioned "height of the scaffolding 100Z as a whole relative to the ground" can be regarded as referring to the height of the push tube 112Z from the ground in the approximate vertical direction.

[0137] To ensure that the hoist 100Z is stably maintained at the required height, i.e., to prevent the upper hoist 110Z from sliding freely relative to the lower hoist 120Z, in one embodiment, as shown in FIG34, the hoist 100Z further includes a height adjustment locking mechanism 130Z. This height adjustment locking mechanism 130Z is disposed between the upper hoist 110Z and the lower hoist 120Z, and the upper hoist 110Z and the lower hoist 120Z can restrict or allow relative movement between them through the height adjustment locking mechanism 130Z. Specifically, the height adjustment locking mechanism 130Z has a locked state and an unlocked state. When the height adjustment locking mechanism 130Z is in the locked state, the upper hoist 110Z is fixed relative to the lower hoist 120Z, and they cannot slide relative to each other. When the height adjustment locking mechanism 130Z is in the unlocked state, the upper hoist 110Z can slide relative to the lower hoist 120Z.

[0138] Referring to Figure 34, in one embodiment, the height adjustment locking mechanism 130Z includes a second locking element 131Z and a second locking portion 133Z. The second locking portion 133Z is disposed on the lower frame 120Z, and the second locking element 131Z is movably disposed on the upper frame 110Z and adapted to lock into the second locking portion 133Z. Specifically, when the second locking element 131Z extends into the second locking portion 133Z to lock in place, the upper frame 110Z is restricted from sliding relative to the lower frame 120Z. When the second locking element 131Z retracts from the second locking portion 133Z to disengage, the upper frame 110Z is allowed to slide relative to the lower frame 120Z.

[0139] In this embodiment, the second locking element 131Z includes a second locking member 1311Z. Specifically, the second locking member 1311Z is disposed within the upper frame 110Z and is movable relative to the upper frame 110Z and the lower frame 120Z to have a locked position and an unlocked position. More specifically, the height adjustment locking mechanism 130Z also includes a first locking part 132Z, which is disposed on the upper frame 110Z. When the second locking member 1311Z is in the locked position, the second locking member 1311Z is locked in place with the first locking part 132Z and the second locking part 133Z to restrict the upper frame 110Z from sliding relative to the lower frame 120Z. At this time, the height adjustment locking mechanism 130Z is in a locked state, thus fixing the overall height of the frame 100Z relative to the ground. When the second locking member 1311Z is in the unlocked position, it releases the lock on the first locking part 132Z and the second locking part 133Z, allowing the upper frame 110Z to slide relative to the lower frame 120Z. At this time, the height adjustment locking mechanism 130Z is in the unlocked state, thus allowing the overall height of the frame 100Z to be adjusted to accommodate users of different heights. It should be noted that in this embodiment, the first locking part 132Z is ​​a slotted structure located on the first support tube 111Z in the upper frame 110Z, and the second locking part 133Z is a slotted structure located on the second support tube 121Z in the lower frame 120Z. When the second locking member 1311Z is in the locked position, it passes through the first locking part 132Z and the second locking part 133Z to lock into both. When the second locking member 1311Z is in the unlocked position, the second locking member 1311Z retracts from the second locking part 133Z to release the lock on the second locking part 133Z.

[0140] In an embodiment, there are multiple (such as two, three or more) second locking parts 133Z, and the multiple second locking parts 133Z are arranged at intervals along the sliding direction of the upper frame 110Z relative to the lower frame 120Z. Specifically, the multiple second locking parts 133Z can be regarded as arranged at intervals along the length direction of the second support pipe 121Z. When the second locking member 1311Z passes through the first locking part 132Z and is respectively inserted and cooperated with different second locking parts 133Z, correspondingly, the overall length of the frame 100Z is different, and correspondingly, the height of the frame 100Z relative to the ground is different, so as to adapt to the holding of users with different heights. Specifically, please refer to FIGS. 34 and 44. In this embodiment, three second locking parts 133Z are provided, and the three second locking parts 133Z can be respectively called the bottom second locking part 1331Z, the middle second locking part 1332Z and the top second locking part 1333Z. Among them, the middle second locking part 1332Z is located between the bottom second locking part 1331Z and the top second locking part 1333Z, and the bottom second locking part 1331Z is closer to the bottom end of the second support pipe 121Z relative to the top second locking part 1333Z. When the second locking member 1311Z passes through the first locking part 132Z and is inserted into the bottom second locking part 1331Z, the length of the frame 100Z is L1, and the height of the pushing pipe 112Z from the ground is H1; when the second locking member 1311Z passes through the first locking part 132Z and is inserted into the middle second locking part 1332Z, the length of the frame 100Z is L2, and the height of the pushing pipe 112Z from the ground is H2; when the second locking member 1311Z passes through the first locking part 132Z and is inserted into the top second locking part 1333Z, the length of the frame 100Z is L3, and the height of the pushing pipe 112Z from the ground is H3; where L1 < L2 < L3 and H1 < H2 < H3.

[0141] Please continue to refer to FIG. 34. In an embodiment, the second locking element 131Z further includes a driving member 1312Z. The driving member 1312Z is movable relative to the upper frame 110Z and is operably connected to the second locking member 1311Z. Specifically, the driving member 1312Z has a locking position and an unlocking position on its moving path. When the driving member 1312Z is in the locking position, the driving member 1312Z drives the second locking member 1311Z to be in the locking position. When the driving member 1312Z is in the unlocking position, the driving member 1312Z drives the second locking member 1311Z to be in the unlocking position. Thus, the user can indirectly control the position of the second locking member 1311Z by directly controlling the position of the driving member 1312Z, and further control the state of the height adjustment locking mechanism 130Z. In this embodiment, the moving direction of the driving member 1312Z is substantially the same as the length direction of the first support pipe 111Z.

[0142] 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 in the figure). Specifically, the support base 136Z is disposed on the upper frame 110Z and has a first guide portion 1361Z. The extension direction of the first guide portion 1361Z is perpendicular to the movement direction of the drive member 1312Z. A second locking member 1311Z is movably disposed on the support base 136Z. The guide member passes through the second locking member 1311Z and extends into the first guide portion 1361Z. More specifically, the drive member 1312Z has a second guide portion (not shown in the figure). The second guide portion extends obliquely relative to the movement direction of the drive member 1312Z. The guide member can extend into the second guide portion and slide in cooperation with the second guide portion. When the drive member 1312Z switches between the locked position and the unlocked position, the second locking member 1311Z can switch 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 can be, for example, a pin or similar component. Of course, in other embodiments, the second locking member 1311Z and the guide member can also be integrally formed, with the guide member considered a component of the second locking member 1311Z. For example, the guide member could be a protrusion integrally formed on the second locking member 1311Z, 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 and unlocked positions. It should also be noted that in this embodiment, both the first guide portion 1361Z and the second guide portion are through-hole structures.

[0143] In one embodiment, the height adjustment locking mechanism 130Z further includes a third reset member 135Z (see FIG. 34), which may be, for example, an elastic element such as a spring or a sheet. Specifically, the third reset member 135Z is a compression spring, which abuts against the support base 136Z and the driving member 1312Z, and is used to provide an elastic restoring force to the driving member 1312Z so that the driving member 1312Z can be held in the locked position, thereby keeping the second locking member 1311Z in the locked position.

[0144] It should be noted that, in this embodiment, in order to improve the stability of the upper frame 110Z when it is fixed relative to the lower frame 120Z, the frame 100Z includes two height adjustment locking mechanisms 130Z. Specifically, the aforementioned height adjustment locking mechanism 130Z is provided between the first support tube 111Z and the second support tube 121Z on the same side.

[0145] Please refer to Figures 33 to 36. In one embodiment, the upper frame 110Z slides relative to the lower frame 120Z so that the frame 100Z as a whole has an extended state (see Figure 33) and a folded state (in other embodiments, the folded state can also be called a closed state or a folded state, etc.) (see Figure 35). Specifically, the length of the frame 100Z in the extended state is greater than the length of the frame 100Z in the folded state. During the process of switching the trolley frame 1000Z to the folded state, the frame 100Z can be in the folded state first, thus further reducing the volume of the trolley frame 1000Z in the folded state. In this embodiment, when the second locking member 1311Z passes through the first locking part 132Z and locks into the bottom second locking part 1331Z, the trolley can be regarded as being in the extended state, and at this time the length of the frame 100Z is the shortest and is L1. When the second locking member 1311Z retracts from the second locking part 133Z to release the locking of the second locking part 133Z, the upper frame 110Z can slide relative to the lower frame 120Z to allow the frame 100Z to switch to the folded state. When the frame 100Z is in the folded state, the length of the frame 100Z is L0, and L0 <L1。

[0146] Referring to Figures 34 and 36, in one embodiment, the trolley frame 1000Z further includes a rider folding and locking mechanism 600Z. This mechanism 600Z is disposed on the rider frame 100Z and adapted to lock the rider frame 100Z in a folded state. Specifically, the rider folding and locking mechanism 600Z includes an engaging member 610Z and a second locking recess 620Z. One of the upper rider frame 110Z and the lower rider frame 120Z has the second locking recess 620Z, and the other has a movable engaging member 610Z. In other words, the second locking recess 620Z is disposed on one of the upper rider frame 110Z and the lower rider frame 120Z, and the engaging member 610Z is movably disposed on the other. Thus, by engaging or disengaging the engaging member 610Z with the second locking recess 620Z, the switching between the folded and extended states of the rider frame 100Z can be restricted or allowed. Specifically, when the engaging member 610Z engages with the second locking recess 620Z, the trolley frame 100Z is locked in the folded state. This prevents the upper trolley frame 110Z from accidentally sliding relative to the lower trolley frame 120Z during transfer or storage, thus avoiding an increase in the overall size of the trolley frame 1000Z and making it inconvenient to transfer or store. When the engaging member 610Z disengages from the second locking recess 620Z, the trolley frame 100Z is allowed to switch to the extended state.

[0147] Referring to Figures 34 and 36, in this embodiment, the support base 136Z is provided with a second locking recess 620Z. The lower handlebar 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 handlebar folding locking mechanism 600Z also includes a fixed base 630Z and a first reset member 640Z, wherein the fixed base 630Z is disposed on the lower handlebar 120Z, and the first reset member 640Z is disposed between the fixed base 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 to engage. The first reset member 640Z can be, for example, an elastic component such as a spring or a spring sheet. Specifically, in this embodiment, the first reset member 640Z is a compression spring, with its two ends abutting between the engaging member 610Z and the fixing seat 630Z.

[0148] Please refer to Figures 34 and 36. In one embodiment, the support base 136Z is provided with a first pushing ramp 1363Z and a second pushing ramp 1364Z. When the frame 100Z switches from an extended state to a folded state, the first pushing ramp 1363Z pushes against the engaging member 610Z, guiding the engaging member 610Z into the second locking recess 620Z for engagement. The second pushing ramp 1364Z is formed on the side wall of the second locking recess 620Z. When the frame 100Z switches from a folded state to an extended state, the second pushing ramp 1364Z pushes against the engaging member 610Z, guiding the engaging member 610Z out of the second locking recess 620Z.

[0149] The following, with reference to Figures 34 and 36, briefly describes the height adjustment process of the 100Z frame and the switching process between the extended and folded states of the 100Z frame.

[0150] Please refer to Figure 34. In this embodiment, when the hoist 100Z is in the extended state and the height of the hoist 100Z relative to the ground needs to be adjusted, the user can first drive the second locking member 1311Z to retract from the second locking part 133Z via the driving member 1312Z. In this way, the upper hoist 110Z can slide freely relative to the lower hoist 120Z for height adjustment. After the hoist 100Z is adjusted to the correct height, the third reset member 135Z drives the driving member 1312Z to reset to the locked position, so that the second locking member 1311Z can pass through the first locking part 132Z again and extend into the second locking part 133Z. In this way, the upper hoist 110Z is restricted from sliding relative to the lower hoist 120Z, so that the hoist 100Z is maintained at the required height.

[0151] Referring to Figures 34 and 36, when the user needs to switch the frame 100Z from the extended state to the folded state (switching from Figure 34 to Figure 36), the user can first drive the second locking member 1311Z to disengage from the second locking part 133Z via the drive member 1312Z. Subsequently, the user can push the upper frame 110Z to move it towards the bottom of the lower frame 120Z (i.e., the bottom end of the second support tube 121Z), thus reducing the overall length of the frame 100Z to switch to the folded state. During the movement, the first abutting inclined surface 1363Z on the support base 136Z will abut against the locking member 610Z, and as the upper frame 110Z moves, it will push the locking member 610Z away from the through hole. At this time, the first reset member 640Z is compressed. When the engaging member 610Z passes the first abutting ramp 1363Z and is aligned with the second locking recess 620Z, the first resetting member 640Z resets 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 engage with the second locking recess 620Z to restrict the sliding of the upper frame 110Z relative to the lower frame 120Z.

[0152] Referring to Figures 34 and 36, when the user needs to switch the frame 100Z from the folded state to the extended state (switching from Figure 36 to Figure 34), the user can directly pull the upper frame 110Z to move it away from the bottom of the lower frame 120Z. This extends the overall length of the frame 100Z, allowing it to switch to the extended state. During the application of pulling force to the upper frame 110Z, the second abutting ramp 1364Z pushes against the locking member 610Z, causing it to gradually disengage from the second locking recess 620Z. During this process, the first reset member 640Z is gradually compressed. Once the locking member 610Z disengages from the second locking recess 620Z, the upper frame 110Z can slide relative to the lower frame 120Z to switch to the extended state.

[0153] Please refer to Figures 34 and 36. In one embodiment, the lower frame 120Z is provided with an abutment 140Z, which is located approximately near the bottom end of the second support tube 121Z. This abutment 140Z abuts against the support seat 136Z to limit the sliding travel of the upper frame 110Z. When the frame 100Z is in the folded state, the support seat 136Z abuts against the abutment 140Z.

[0154] To improve the convenience for users in releasing the wheel locking mechanism 500Z and the height adjustment locking mechanism 130Z, the release mechanism 300Z in one embodiment of the present invention can perform release operations on both the wheel locking mechanism 500Z and the height adjustment locking mechanism 130Z. Specifically, the release mechanism 300Z can be driven connected to both 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 to enable the cart frame 1000Z to drift and turn, while also allowing the upper handlebar 110Z to move relative to the lower handlebar 120Z to change the height of the handlebar 100Z relative to the ground. Specifically, as shown in Figure 33, the release mechanism 300Z is mounted on the handlebar 100Z. More specifically, it is mounted on the push handle tube 112Z of the upper handlebar 110Z, thus facilitating user operation. Of course, in other embodiments, the release mechanism 300Z may also be provided on the first support tube 111Z, the off-car handrail 120Z, or the wheel frame 200Z, without specific limitations.

[0155] 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 frame 100Z and drivenly connected to the wheel locking mechanism 500Z to allow the wheel seat 230Z to rotate relative to the wheel frame 200Z for drift steering. Specifically, the first release member 310Z is drivenly connected to the first locking member 510Z in the wheel locking mechanism 500Z. The second release member 320Z is rotatably mounted on the frame 100Z and drivenly connected to the height adjustment locking mechanism 130Z to allow the upper frame 110Z to move relative to the lower frame 120Z. Specifically, the second release member 320Z is drivenly connected to the driving member 1312Z in the height adjustment locking mechanism 130Z. The operating element 330Z is movably mounted on the rider frame 100Z and selectively drives the first release element 310Z or the second release element 320Z to rotate. It should be noted that in other embodiments, the first release element 310Z may also be driven connected to the height adjustment locking mechanism 130Z, and the second release element 320Z may be driven connected to the wheel locking mechanism 500Z; no specific limitations are imposed here.

[0156] Since the first unlocking member 310Z is rotatably mounted on the handlebar frame 100Z and drivenly connected to the first locking member 510Z, and the second unlocking member 320Z is rotatably mounted on the handlebar frame 100Z and drivenly connected to the drive member 1312Z, and the operating member 330Z is movable and used to drive either the first unlocking member 310Z or the second unlocking member 320Z to rotate, the user can control the rotation of the first unlocking member 310Z by driving the movement of the operating member 330Z, thereby indirectly controlling the first locking member 510Z in the wheel locking mechanism 500Z. When the first locking member 510Z extends into the first locking recess 520Z to lock in place, the wheel seat 230Z is restricted from rotating relative to the wheel frame 200Z, and the trolley frame 1000Z can travel in a straight line. When the first locking member 510Z retracts from the first locking recess 520Z to disengage, the wheel seat 230Z is allowed to rotate relative to the wheel frame 200Z, and the trolley frame 1000Z can drift and steer. Simultaneously, the user can control the rotation of the second release member 320Z by moving the drive operating member 330Z, thereby indirectly controlling the second locking element 131Z (i.e., the drive member 1312Z and the second locking member 1311Z) in the height adjustment locking mechanism 130Z. Specifically, when the drive member 1312Z is ​​in the locked position, the second locking member 1311Z is correspondingly in the locked position, and the second locking member 1311Z is locked in engagement with the first locking part 132Z and the second locking part 133Z, thereby restricting the movement of the upper handrail 110Z relative to the lower handrail 120Z. When the drive component 1312Z is ​​in the unlocked position, the second locking component 1311Z is in the corresponding unlocked position. The second locking component 1311Z is unlocked from the first locking part 132Z and the second locking part 133Z, allowing the upper frame 110Z to move relative to the lower frame 120Z. Because the user only needs to operate the aforementioned unlocking mechanism 300Z to control the different locking mechanisms, the ease of operation for the user is improved.

[0157] Please refer to Figures 37 to 40. In one embodiment, both the first unlocking member 310Z and the second unlocking member 320Z can be disc-shaped, and both are rotatably mounted on the pusher tube 112Z of the handframe 100Z via a shaft or pin. Specifically, the pusher tube 112Z is ​​provided with a mounting base 340Z, on which the first unlocking member 310Z and the second unlocking member 320Z are rotatably mounted.

[0158] Referring to Figures 34 and 37, in one embodiment, the first unlocking member 310Z is provided with a first connecting portion 311Z. The first connecting portion 311Z is offset from the rotation center of the first unlocking member 310Z, for example, it can be arranged in a straight line or in a non-linear shape, but it is not limited thereto. The first connecting portion 311Z is used to connect the wheel locking mechanism 500Z. In this embodiment, the wheel locking mechanism 500Z also includes a first traction member 540Z, which is disposed in the wheel frame 200Z and the rider frame 100Z and passes through the first pivot seat 400Z and the height adjustment locking mechanism 130Z to connect between the first unlocking member 310Z and the first locking member 510Z. Specifically, one end of the first traction member 540Z is connected to the first release member 310Z (specifically, the first connecting part 311Z), and the other end of the first traction member 540Z (i.e., the end away from the first release member 310Z) passes through the height adjustment locking mechanism 130Z and the first pivot seat 400Z in sequence and is connected to the first locking member 510Z provided in the rear wheel frame 220Z. In this way, the first release member 310Z can drive the first locking member 510Z to retract from the first locking recess 520Z through the first traction member 540Z. Specifically, referring to Figures 34, 37 and 41, when the operating member 330Z drives the first release member 310Z to rotate around its rotation center, the first connecting part 311Z will rotate synchronously around the rotation center of the first release member 310Z, thereby driving the first traction member 540Z to move and pull the first locking member 510Z to move and retract from the first locking recess 520Z.

[0159] As shown in Figures 34 and 37, similarly, the second unlocking member 320Z is provided with a second connecting portion 321Z. The rotation center of the second connecting portion 321Z and the second unlocking member 320Z are offset, for example, they can be arranged in a straight line or in a non-linear shape, but are not limited thereto. The second connecting portion 321Z is used to connect the height adjustment locking mechanism 130Z. Specifically, in this embodiment, the height adjustment locking mechanism 130Z also includes a second traction member 137Z, which is disposed in the upper frame 110Z and connected between the second unlocking member 320Z and the second locking element 131Z (specifically, the driving member 1312Z). Specifically, referring 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 locked position to the unlocked position.

[0160] Specifically, in this embodiment, as shown in Figures 34 and 37, both the first traction member 540Z and the second traction member 137Z can be, for example, traction ropes. More specifically, the first release member 310Z has two first connecting portions 311Z, and the second release member 320Z has two second connecting portions 321Z. The two first connecting portions 311Z are respectively connected to the two first traction members 540Z, and the two second connecting portions 321Z are respectively connected to the two second traction members 137Z. In this way, when the first release member 310Z rotates, it can simultaneously control the release of the two wheel locking mechanisms 500Z. When the second release member 320Z rotates, it can simultaneously control the release of the two height adjustment locking mechanisms 130Z.

[0161] Referring to Figures 34, 36, and 37, in this embodiment, the support base 136Z is provided with a first through-passage channel 1365Z and a second through-passage channel 1366Z. The first through-passage channel 1365Z is used to accommodate the first traction member 540Z, and the second through-passage channel 1366Z is used to accommodate the second traction member 137Z. This prevents the first traction member 540Z from becoming entangled with other components when passing through the height adjustment locking mechanism 130Z. Specifically, the first through-passage channel 1365Z is approximately U-shaped. The other end of the first traction member 540Z (i.e., the end furthest from the first release member 310Z) extends into the support base 136Z from one opening of the U-shaped channel and then extends out from the other opening, surrounding the support base 136Z and extending into the first pivot seat 400Z. The first traction member 540Z is wound inside the support base 136Z. This prevents the first traction member 540Z from getting tangled in the height adjustment locking mechanism 130Z after the height of the frame 100Z is lowered. Specifically, the second through-channel 1366Z can be roughly a straight channel. When one end of the second traction member 137Z rotates with the second release member 320Z, the other end of the second traction member 137Z can be quickly operated through the straight channel to drive the drive member 1312Z to move.

[0162] 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 frame 100Z and can switch 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 driven 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 driven connected to the second release member 320Z via the safety lock 350Z. Specifically, as shown in Figures 34 and 41, when the user needs to release the wheel locking mechanism 500Z to enable the cart frame 1000Z to drift and steer, the safety lock 350Z can be moved to the first position. Thus, by operating the operating member 330Z, the first release member 310Z can be rotated. As shown in Figures 34 and 42, when the user needs to release the height adjustment locking mechanism 130Z to adjust the height of the rider frame 100Z or to switch the rider frame 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.

[0163] Please refer to Figures 37 to 40. In one embodiment, the safety lock 350Z includes a first linkage 351Z, a second linkage 352Z, and a toggle member 353Z. The first linkage 351Z is driven to the first release member 310Z; the second linkage 352Z is ​​driven to the second release member 320Z; and the toggle member 353Z is connected to both the first linkage 351Z and the second linkage 352Z. The toggle member 353Z is movably mounted on the rider frame 100Z and can switch between a first position and a second position to move the first linkage 351Z and the second linkage 352Z along a first direction F1. Specifically, when the actuating member 353Z is in the first position, the operating member 330Z is operated to push the first linkage member 351Z to move along the second direction F2, thereby causing the first release member 310Z to rotate; when the actuating member 353Z is in the second position, the operating member 330Z is operated to push the second linkage member 352Z to move along the second direction F2, thereby causing the second release member 320Z to rotate, and the first direction F1 and the second direction F2 intersect.

[0164] Referring to Figures 34, 41 to 43, in one embodiment, the first linkage 351Z has a first abutment portion 3511Z, and the second linkage 352Z has a second abutment portion 3521Z. The operating member 330Z has a first driving portion 331Z and a second driving portion 332Z spaced apart. When the actuating member 353Z is in the first position, the first abutment portion 3511Z is positioned opposite the first driving portion 331Z, and the second abutment portion 3521Z is misaligned with the second driving portion 332Z. Thus, when the operating member 330Z moves upward along the second direction F2, the first driving portion 331Z can abut against the first abutment portion 3511Z, thereby pushing the first linkage 351Z to move along the second direction F2, thereby driving the first unlocking member 310Z to rotate, ultimately releasing the wheel locking mechanism 500Z. Meanwhile, because the second abutment portion 3521Z and the second drive portion 332Z are misaligned, when the operating member 330Z moves upward along the second direction F2, the second drive portion 332Z will not contact the second abutment portion 3521Z. This allows both the second linkage member 352Z and the second release member 320Z to remain stationary, meaning that when the operating member 330Z is operated, it will not affect the height adjustment locking mechanism 130Z. Similarly, when the actuating member 353Z is in the second position, the second abutment portion 3521Z is positioned opposite the second drive portion 332Z, and the first abutment portion 3511Z is misaligned with the first drive portion 331Z. Thus, when the operating member 330Z moves upward along the second direction F2, the second drive portion 332Z can abut against the second abutment portion 3521Z, thereby pushing the second linkage member 352Z to move along the second direction F2, which in turn drives the second release member 320Z to rotate, ultimately releasing the height adjustment locking mechanism 130Z. At the same time, since the first abutment part 3511Z and the first drive part 331Z are misaligned, when the operating member 330Z moves upward along the second direction F2, the first drive part 331Z will not contact the first abutment part 3511Z, thereby allowing the first linkage 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.

[0165] 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 linkage member 351Z and the second linkage member 352Z are spaced apart, and a third clearance portion 354Z is formed between them. Specifically, the first linkage member 351Z also has a third abutting portion 3512Z, and the second linkage member 352Z also has a fourth abutting portion 3522Z. When the actuating member 353Z is in the first position, the third abutting portion 3512Z is ​​located opposite the third driving portion 333Z, the first abutting portion 3511Z is located opposite the first driving portion 331Z, and the fourth driving portion 334Z is located opposite the third clearance portion 354Z. Therefore, when the operating member 330Z moves upward along the second direction F2, the first driving part 331Z abuts against the first abutting part 3511Z, and the third abutting part 3512Z abuts against the third driving part 333Z, thereby simultaneously pushing the first linkage member 351Z to move along the second direction F2. At the same time, as the operating member 330Z moves upward along the second direction F2, the fourth driving part 334Z gradually inserts into the third clearance part 354Z, preventing the second linkage member 352Z from moving when the actuating member 353Z is in the first position. Similarly, when the actuating member 353Z is in the second position, the fourth abutting part 3522Z is ​​positioned opposite the fourth driving part 334Z, the second abutting part 3521Z is positioned opposite the second driving part 332Z, and the third driving part 333Z is positioned opposite the third clearance part 354Z. Therefore, when the operating member 330Z moves upward along the second direction F2, the second driving part 332Z can abut against the second abutting part 3521Z, and the fourth abutting part 3522Z can abut against the fourth driving part 334Z, thereby simultaneously pushing the second linkage member 352Z to move along the second direction F2. At the same time, as the operating member 330Z moves upward along the second direction F2, the third driving part 333Z gradually inserts into the third clearance part 354Z, preventing the first linkage member 351Z from moving when the toggle member 353Z is in the second position.

[0166] In one embodiment, as shown in FIG43, 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 actuating member 353Z is in the first position and the operating member 330Z is operated, the second clearance portion is used to clear the second driving member 332Z. When the actuating member 353Z is in the second position and the operating member 330Z is operated, the first clearance portion is used to clear the first driving member 331Z.

[0167] Referring to Figures 34, 37, and 38, in one embodiment, the unlocking mechanism 300Z further includes a fourth reset member 360Z, which can be an elastic element such as a spring or sheet. The fourth reset member 360Z abuts against the handlebar frame 100Z (e.g., pusher tube 112Z) and the actuating member 353Z, providing an elastic restoring force to the actuating member 353Z to maintain it in a first or second position. For example, in this embodiment, the fourth reset member 360Z is used to constantly keep the actuating member 353Z in the first position. If the wheel locking mechanism 500Z needs to be unlocked, the operating member 330Z can be operated directly (e.g., pressed or pushed upwards). If the height adjustment locking mechanism 130Z needs to be unlocked, the actuating member 353Z must first be moved to the second position before operating the operating member 330Z. After the height adjustment locking mechanism 130Z is released, the toggle member 353Z is released. Under the reset action of the fourth reset member 360Z, the toggle member 353Z automatically resets to the second position.

[0168] In one embodiment, one of the first linkage 351Z and the first release member 310Z has a first guide recess (not shown in the figure), and the other has a first mating protrusion (not shown in the figure). The first mating protrusion is slidably disposed within the first guide recess, and the first guide recess extends along a first direction F1. Similarly, one of the second linkage 352Z and the second release member 320Z has a second guide recess (not shown in the figure), and the other has a second mating protrusion (not shown in the figure). The second mating protrusion is slidably disposed within the second guide recess, and the second guide recess extends along a first direction F1. Thus, when the actuating member 353Z switches between the first position and the second position along the first direction F1, it can drive the first linkage member 351Z and the second linkage member 352Z to move left and right along the first direction F1 simultaneously, so that the first release member 310Z and the second release member 320Z remain stationary; at the same time, when the first linkage member 351Z moves up and down along the second direction F2, the first linkage member 351Z can also drive the first release member 310Z to rotate; and when the second linkage member 352Z moves up and down along the second direction F2, the second linkage member 352Z can also drive the second release member 320Z to rotate.

[0169] 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 it moves in the second direction F2. When the operating member 330Z is in the initial position, it can be operated to move and push the first linkage 351Z or the second linkage 352Z to move. In other words, when the operating member 330Z is in the initial position, there can be a gap or just contact between the first driving part 331Z and the first abutting part 3511Z and between the third driving part 333Z and the third abutting part 3512Z (or between the second driving part 332Z and the second abutting part 3521Z and between the fourth driving part 334Z and the fourth abutting part 3522Z) on the operating member 330Z. In this way, the first linkage 351Z (or the second linkage 352Z) can be pushed or pressed upward by pushing or pressing the operating member 330Z. When the operating element 330Z is in the unlocked position, the operating element 330Z pushes against the first linkage element 351Z or the second linkage element 352Z.

[0170] Specifically, as shown in Figures 37 and 41 to 43, when the actuating member 353Z is in the first position and the operating member 330Z is in the initial position, there may be a gap or just contact between the first driving part 331Z and the first abutting part 3511Z, and between the third driving part 333Z and the third abutting part 3512Z. At this time, the operating member 330Z can be pushed upward or pressed to move to the unlocked position, and in the process, it pushes against the first linkage member 351Z, causing the first linkage member 351Z to drive the first unlocking member 310Z to rotate. When the actuating member 353Z is in the second position and the operating member 330Z is in the initial position, there may be a gap or just contact between the second driving part 332Z and the second abutting part 3521Z, and between the fourth driving part 334Z and the fourth abutting part 3522Z. At this time, the operating member 330Z can be pushed or pressed upward to move to the unlocked position, and in the process, it pushes against the second linkage member 352Z, causing the second linkage member 352Z to drive the second release member 320Z to rotate.

[0171] In one embodiment, as shown in Figures 37 and 39, the release mechanism 300Z further includes a fifth reset member 370Z, which may be an elastic element such as a spring or a sheet. The fifth reset member 370Z abuts between the mounting base 340Z of the frame 100Z and the operating member 330Z, and is used to provide an elastic restoring force to the operating member 330Z so that the operating member 330Z is held in its initial position.

[0172] Referring to Figures 33 and 40 to 42, in one embodiment, the unlocking mechanism 300Z further includes a first fixing cover 381Z and a second fixing cover 382Z. The first fixing cover 381Z and the second fixing cover 382Z are disposed on the upper and lower sides of the push handle tube 112Z, respectively. The first fixing cover 381Z is located at the top of the push handle tube 112Z, and the second fixing cover 382Z is ​​located at the bottom of the push handle tube 112Z. The second fixing cover 382Z has a through hole for the operating member 330Z to pass through. The first fixing cover 381Z and the second fixing cover 382Z are connected and fixed to the push handle tube 112Z. This limits the movement of components such as the operating member 330Z, preventing them from detaching from the push handle tube 112Z. Furthermore, by covering the first locking member 310Z, the second locking member 320Z, and the safety lock 350Z with the first fixing cover 381Z and the second fixing cover 382Z, the locking mechanism 300Z and the trolley frame 1000Z can be simplified and aesthetically improved. Specifically, as shown in Figures 41 and 42, the first fixing cover 381Z is provided with an operating hole 3811Z, and the actuating member 353Z is provided with a pushing part 3531Z. The pushing part 3531Z can pass through the operating hole 3811Z for the user to hold, and the user can change the position of the actuating member 353Z by pushing the pushing part 3531Z. Of course, in other embodiments, as shown in FIG44, the first fixing cover 381Z and the second fixing cover 382Z are disposed on the front and rear sides of the pusher tube 112Z. The first fixing cover 381Z is located on the rear side of the pusher tube 112Z, and the second fixing cover 382Z is ​​located on the front side of the pusher tube 112Z. The first fixing cover 381Z and the second fixing cover 382Z together form a through hole for the operating member 330Z to pass through, and the first fixing cover 381Z is provided with an operating hole 3811Z.

[0173] Figure 45 shows a partial structural perspective view of a trolley frame 1000Z according to a second embodiment of the present invention. This trolley frame 1000Z is similar to the first embodiment described above, including components such as a handlebar frame 100Z, wheel frames 200Z, wheel seats 230Z, and a locking mechanism 300Z. The trolley frame 1000Z of this embodiment is a variation of the trolley frame 1000Z of the first embodiment described above. Unless otherwise specified, the structure of the components and the connection relationships between the components in this embodiment can be found in the description of the first embodiment above. The following mainly describes the differences between this embodiment and the first embodiment described above.

[0174] In this embodiment, "movement of the upper frame 110Z relative to the lower frame 120Z" means that the upper frame 110Z can rotate relative to the lower frame 120Z. The upper frame 110Z and the lower frame 120Z are restricted or allowed 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 frame 110Z, and the second connecting seat 139Z is connected to the lower frame 120Z and pivotally connected to the first connecting seat 138Z. The second locking member 1311Z is axially movable between the first connecting seat 138Z and the second connecting seat 139Z to restrict or allow the relative pivoting of the first connecting seat 138Z and the second connecting seat 139Z, thereby restricting or allowing the upper frame 110Z to rotate relative to the lower frame. When the upper frame 110Z rotates relative to the lower frame 120Z around the height adjustment locking mechanism 130Z, the height of the upper frame 110Z (specifically the push handle tube 112Z) relative to the ground can be changed (see Figure 46), thus accommodating users of different heights to hold the push handle tube 112Z. It should be noted that, in this embodiment, in order to clearly understand the position of the upper frame 110Z after rotating relative to the lower frame 120Z, the different positions of the upper frame 110Z after rotating relative to the lower frame 120Z are marked with dashed lines in Figure 46.

[0175] Referring to Figures 47 to 49, in this embodiment, the first connecting seat 138Z has a first chamber 1381Z on the side facing the second connecting seat 139Z, and the side wall of the first chamber 1381Z has a first locking groove 1382Z. The second connecting seat 139Z has a second chamber 1391Z on the side facing the first connecting seat 138Z, and the side wall of the second chamber 1391Z has a second locking groove (not shown in the figures). The second locking member 1311Z has locking teeth 13111Z and has a locked position and an unlocked position. Specifically, when the second locking member 1311Z is in the locked position, the locking teeth 13111Z simultaneously engage the first locking groove 1382Z and the second locking groove, thus restricting the pivoting of the first connecting seat 138Z relative to the second connecting seat 139Z. When the second locking member 1311Z is in the unlocked position, the locking tooth 13111Z disengages from the first locking groove 1382Z or the second locking groove, thus allowing the first connecting seat 138Z to pivot relative to the second connecting seat 139Z.

[0176] Please refer to Figures 47 to 49. In this embodiment, the height adjustment locking mechanism 130Z further includes a driving member 1312Z. The driving member 1312Z is ​​movably disposed on the side of the first connecting seat 138Z facing away from the second connecting seat 139Z, and the driving member 1312Z passes through the first connecting seat 138Z axially and abuts against the second locking member 1311Z to drive the second locking member 1311Z to move. In this way, the second locking member 1311Z can be disengaged from the first locking groove 1382Z. Specifically, referring to Figures 42, 47 to 49, the height adjustment locking mechanism 130Z also includes a second traction member 137Z, which connects the driving member 1312Z and the second releasing member 320Z. When the height of the rider frame 100Z needs to be adjusted, the second release member 320Z can be rotated by operating the operating member 330Z. In this way, under the transmission action of the second traction member 137Z, the driving member 1312Z is ​​driven to move to push the second locking member 1311Z completely out of 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 opposite to the first connecting seat 138Z, and the driving member 1312Z passes through the second connecting seat 139Z axially and abuts against the second locking member 1311Z to drive the second locking member 1311Z to move, so that the second locking member 1311Z can be disengaged from the second locking groove. When it is necessary to adjust the height of the rider frame 100Z, the second release member 320Z can be rotated by operating the operating member 330Z. In this way, under the transmission action of the second traction member 137Z, the driving member 1312Z is ​​driven to move to push the second locking member 1311Z to completely retract into the first chamber 1381Z.

[0177] It should be noted that, in this embodiment, the third reset member 135Z abuts axially between the second locking member 1311Z and the second connecting seat 139Z and is used to keep the second locking member 1311Z in the locked position. Furthermore, it should be noted that, in this embodiment, when the height of the rider frame 100Z needs to be adjusted, the user can also push the second locking member 1311Z by directly operating (e.g., pressing) the drive member 1312Z, without needing to operate the operating member 330Z.

[0178] In this embodiment, the first traction member 540Z can be directly inserted 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 FIG50, the height adjustment locking mechanism 130Z may also include a cover 1341Z. The cover 1341Z may be connected to either the first connecting seat 138Z or the second connecting seat 139Z, and a passage space 1342Z may be formed between the cover 1341Z and either the first connecting seat 138Z or the second connecting seat 139Z, within which the first traction member 540Z is inserted. 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 and forms the passage space 1342Z with the second connecting seat 139Z. When the driving component 1312Z is ​​movably disposed on the side of the second connecting seat 139Z facing away from the first connecting seat 138Z, the cover 1341Z is disposed 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 and the first connecting seat 138Z.

[0179] The aforementioned trolley frame 1000Z and its unlocking mechanism 300Z have the following technical advantages:

[0180] The aforementioned trolley frame 1000Z includes a release mechanism 300Z. In the aforementioned release mechanism 300Z, a first release member 310Z is rotatably mounted on the trolley frame 1000Z and drivenly connected to the wheel locking mechanism 500Z, and a second release member 320Z is rotatably mounted on the trolley frame 1000Z and drivenly connected to the height adjustment locking mechanism 130Z. The 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 with the wheel seat 230Z relative to the rear wheel frame 220Z for drift 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 moving the drive member 330Z, thereby indirectly controlling the wheel locking mechanism 500Z, enabling the cart frame 1000Z to have a drift steering function. Simultaneously, the user can also control the rotation of the second release member 320Z by moving the drive member 330Z, thereby indirectly controlling the height adjustment locking mechanism 130Z, making the overall height of the cart frame 100Z adjustable. Because the user only needs to operate the aforementioned release mechanism 300Z to control the different locking mechanisms individually, the ease of operation for the user is greatly improved.

[0181] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0182] The embodiments described above are merely examples of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0183] 1000X: Stroller Frame 100X: Release mechanism 110X: First release mechanism 111X: First connecting part 112X: First stop protrusion 120X: Second release mechanism 121X: Second connecting part 122X: Second stop protrusion 130X: Operating components 131X: First Drive Unit 132X: Second Drive Unit 133X: Third Drive Unit 134X: Fourth Drive Unit 135X: Limiting post 140X: Safety Lock 141X: Toggle element 1411X: Propulsion Department 142X: First Linkage Component 1421X: First contact section 1422X: Third contact section 1423X: First Avoidance Section 143X: Second Linkage Component 1431X: Second contact section 1432X: Fourth contact section 1433X: Second Avoidance Section 144X: Third Avoidance Section 150X: First elastic element 160X: Second elastic element 171X: First fixed cover 1711X: Operating Hole 172X: Second fixed cover 200X: Rider's Frame 210X: Mounting Handrail 211X: First support tube 212X: Push-hand tube 2121X: First stop recess 2122X: Second stop recess 220X: Dismounting Handrail 221X: Second support tube 300X: Wheel frame 310X: Front wheel frame 311X: Front strut 312X: Front crossbar 313X: Front wheel mount 320X: Rear wheel frame 321X: Rear strut 322X: Reinforcing bar 323X: Rear wheel seat 400X: Height Adjustment Locking Mechanism 410X: Driver Lock-Up Component 411X: Moving parts 4111X: Guide groove 412X: Second locking component 413X: Support base 414X: Fourth elastic element 420X: Locking Hole 430X: Second traction component 500X: Closing and Locking Mechanism 510X: First locking component 520X: Fixture 521X: Locking Recess 530X: First traction component 610X: Front wheel 620X: Rear wheel F1: First Direction F2: Second direction 1000Y: Stroller Frame 100Y: Rider Frame 110Y: Support tube 120Y: Push Hand Tube 130Y: Fixed support base 140Y: Mounting bracket 200Y: Wheel frame 210Y: Front wheel frame 220Y: Rear wheel frame 230Y: First transmission component 240Y: Armrest component 250Y: Second transmission component 260Y: Third transmission component 270Y: Wheel 300Y: Reversing Locking Mechanism 310Y: First locking component 311Y: Locking Unit 320Y: First Card Assembly 330Y: Second Card Assembly 301Y: Locking unit 340Y: First drive unit 350Y: First traction component 360Y: First Connector 370Y: First reset component 400Y: Closing and locking mechanism 410Y: Second locking component 420Y: Second drive element 421Y: Second sliding sleeve 422Y: Second drive unit 430Y: Second traction component 440Y: Second reset component 450Y: Second connector 500Y: Release mechanism 510Y: First release mechanism 511Y: First connecting part 520Y: Second release mechanism 521Y: Second connecting part 530Y: Operating components 531Y: First Drive Unit 532Y: Second Drive Unit 533Y: Third Drive Unit 534Y: Fourth Drive Unit 540Y: Safety Lock 541Y: First Linkage Component 5411Y: First contact section 5412Y: Third landing section 542Y: Second linkage component 5421Y: Second Abutment Section 5422Y: Fourth landing section 543Y: Toggle component 5431Y: Promotion Department 544Y: Third Avoidance Section 550Y: Third reset component 560Y: Fourth Reset Component 571Y: First fixed cover 5711Y: Operating Hole 572Y: Second fixed 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: Stroller Frame 100Z: Rider Frame 110Z: Mounting Handrail 111Z: First support tube 112Z: Pusher tube 120Z: Dismounting Handrail 121Z: Second support tube 130Z: Height Adjustment Locking Mechanism 131Z: Second locking element 1311Z: Second locking component 13111Z: Locking tooth 1312Z: Driver component 132Z: First locking unit 133Z: Second locking unit 1331Z: Second locking part at the bottom 1332Z: Second central locking unit 1333Z: Top Second Locking Part 1341Z: Cover 1342Z: Wearing Space 135Z: Third reset component 136Z: Support base 1361Z: First guide section 1363Z: First pushing slope 1364Z: Second pushing slope 1365Z: First tunnel 1366Z: Second tunnel 137Z: Second traction component 138Z: First connector 1381Z: First Chamber 1382Z: First locking slot 139Z: Second Connector 1391Z: Second Chamber 140Z: Connecting part 200Z: Wheel frame 210Z: Front wheel frame 211Z: Front strut 212Z: Front crossbar 220Z: Rear wheel frame 221Z: Rear strut 222Z: Rear crossbar 230Z: Wheel seat 230AZ: Front wheel mount 230BZ: Rear wheel seat 240Z: Wheels 240AZ: Front wheel 240BZ: Rear wheel 300Z: Release mechanism 310Z: First release mechanism 311Z: First connecting part 320Z: Second release mechanism 321Z: Second connecting part 330Z: Operating components 331Z: First Drive Unit 332Z: Second Drive Unit 333Z: Third Drive Unit 334Z: Fourth Drive Unit 340Z: Mounting bracket 350Z: Safety Lock 351Z: First Linkage Component 3511Z: First contact section 3512Z: Third landing section 352Z: Second Linkage Component 3521Z: Second abutment section 3522Z: Fourth landing section 353Z: Toggle component 3531Z: Propulsion Department 354Z: Third Avoidance Section 360Z: Fourth Reset Component 370Z: Fifth Reset Component 381Z: First fixed cover 3811Z: Operating Hole 382Z: Second fixed cover 400Z: First pivot joint 500Z: Wheel locking mechanism 510Z: First locking component 520Z: First locking recess 530Z: Second reset component 540Z: First traction component 600Z: Rider's folding locking mechanism 610Z: Card assembly 620Z: Second locking recess 630Z: Mounting base 640Z: First reset component α1: First included angle α2: Second included angle α3: Third included angle α4: Fourth included angle F1: First Direction F2: Second direction

Claims

1. A release mechanism for a trolley frame, the trolley frame including an upper handle, a lower handle, wheel frames, a height adjustment locking mechanism, and a retraction locking mechanism, wherein the upper handle and the lower handle restrict or allow relative movement between them via the height adjustment locking mechanism, and the lower handle is pivotally connected to the wheel frames and restricts or allows relative pivoting between them via the retraction locking mechanism, the release mechanism comprising: A first release member, rotatably mounted on the trolley frame, is driven to the retraction locking mechanism to allow the lower handrail to pivot relative to the wheel frame; a second release member, rotatably mounted on the trolley frame, is driven to the height adjustment locking mechanism to allow the upper handrail to move relative to the lower handrail; and an operating member, movably mounted on the trolley frame and adapted to drive either the first or the second release member to rotate.

2. A release mechanism for a trolley frame, the trolley frame including a handlebar, a wheel frame, a reversing locking mechanism, and a retraction locking mechanism, the handlebar being rotatably mounted on the wheel frame, the reversing locking mechanism and the retraction locking mechanism being disposed between the handlebar and the wheel frame, the handlebar being able to restrict or allow its rotation relative to the wheel frame for reversing by means of the reversing locking mechanism, and the handlebar being able to restrict or allow its rotation relative to the wheel frame for retraction by means of the retraction locking mechanism, wherein the release mechanism includes: A first release member is rotatably mounted on the trolley frame and drivenly connected to the reversing locking mechanism to allow the handrail to rotate relative to the wheel frame for reversing; a second release member is rotatably mounted on the trolley frame and drivenly connected to the retraction locking mechanism to allow the handrail to rotate relative to the wheel frame for retraction; and an operating member is movably mounted on the trolley frame and selectively drives the first release member or the second release member to rotate.

3. The unlocking mechanism according to claim 1 or 2, wherein the unlocking mechanism further includes a safety lock, the safety lock being movably mounted on the trolley frame and switchable between a first position and a second position; when the safety lock is in the first position, the operating member is driven connected to the first unlocking member through the safety lock; when the safety lock is in the second position, the operating member is driven connected to the second unlocking member through the safety lock.

4. The unlocking mechanism according to claim 3, wherein the safety lock comprises: A toggle element is movably disposed on the trolley frame in a first direction and can switch between the first position and the second position; A first linkage is movably connected to the actuating member along a second direction and is drivenly connected to the first unlocking member; and a second linkage is movably connected to the actuating member along a second direction and is drivenly connected to the second unlocking member; wherein the first direction intersects the second direction, and the operating member is movable relative to the trolley frame along the second direction; when the actuating member is in the first position, the operating member can be operated to push the first linkage to move, thereby causing the first unlocking member to rotate; when the actuating member is in the second position, the operating member can be operated to push the second linkage to move, thereby causing the second unlocking member to rotate.

5. The unlocking mechanism according to claim 1, wherein the first unlocking member is provided with a first connecting portion, the first connecting portion being offset from the rotation center of the first unlocking member, and the first connecting portion being used to connect the closing locking mechanism; the second unlocking member is provided with a second connecting portion, the second connecting portion being offset from the rotation center of the second unlocking member, and the second connecting portion being used to connect the height adjustment locking mechanism.

6. A trolley frame, comprising an upper frame, a lower frame, a wheel frame, a retraction locking mechanism, a height adjustment locking mechanism, and a release mechanism as described in claim 1, wherein the upper frame and the lower frame restrict or allow relative movement between them via the height adjustment locking mechanism, the lower frame is pivotally connected to the wheel frame and restricts or allows relative pivoting between them via the retraction locking mechanism, and the release mechanism is disposed on the frame or the wheel frame and is drivenly connected to the retraction locking mechanism and the height adjustment locking mechanism respectively, so as to allow the lower frame to pivot relative to the wheel frame and the upper frame to move relative to the lower frame.

7. A stroller frame having an unfolded state and a folded state, comprising: Wheel frame; A rotatable frame is provided on the wheel frame; a reversing locking mechanism is provided between the rotatable frame and the wheel frame, which restricts or allows the rotatable frame to rotate relative to the wheel frame for reversing; a retraction locking mechanism is provided between the rotatable frame and the wheel frame, which restricts or allows the rotatable frame to rotate relative to the wheel frame for retraction; and the release mechanism described in claim 2 is provided on the rotatable frame and drivenly connected to the retraction locking mechanism and the release mechanism respectively, so as to allow the rotatable frame to rotate relative to the wheel frame for reversing or retraction.

8. A release mechanism for a trolley frame, the trolley frame including a handlebar, a wheel frame, a wheel seat, and a wheel locking mechanism, the handlebar including an upper handlebar, a lower handlebar, and a height-adjustable locking mechanism disposed between the two, the upper handlebar and the lower handlebar restricting or allowing relative movement between them via the height-adjustable locking mechanism; the wheel seat being rotatably connected to the wheel frame, the wheel locking mechanism being disposed between the wheel frame and the wheel seat, and used to restrict or allow rotation of the wheel seat relative to the wheel frame, wherein the release mechanism includes: A first release member is rotatably mounted on the trolley frame and drivenly connected to the wheel locking mechanism to allow the wheel seat to rotate relative to the wheel frame; a second release member is rotatably mounted on the trolley frame and drivenly connected to the height adjustment locking mechanism to allow the upper handrail to move relative to the lower handrail; and an operating member is movably mounted on the trolley frame and selectively drives the first release member or the second release member to rotate.

9. A stroller frame, comprising: The vehicle includes a frame, wheel frame, wheel seat, wheel locking mechanism, and release mechanism as described in claim 8. The frame includes an upper frame, a lower frame, and a height adjustment locking mechanism disposed between the two, wherein the upper frame and the lower frame restrict or allow relative movement between them via 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 rotation of the wheel seat relative to the wheel frame; the release mechanism is disposed on the frame and is drivenly connected to both the wheel locking mechanism and the height adjustment locking mechanism to allow rotation of the wheel seat relative to the wheel frame and movement of the upper frame relative to the lower frame.

10. The trolley frame according to claim 9, wherein the wheel locking mechanism comprises: A first locking recess is provided in the wheel seat; A first locking element is movably disposed on the wheel frame and adapted to lock into the first locking recess; The first traction member is connected between the first release member and the first locking member; when the first locking member extends into the first locking recess to lock into engagement, the wheel seat is restricted from rotating relative to the wheel frame; when the first release member drives the first locking member to retract from the first locking recess through the first traction member to release engagement, the wheel seat is allowed to rotate relative to the wheel frame.

11. The trolley frame according to claim 10, wherein the first traction member is disposed within the handframe and the wheel frame and passes through the height adjustment locking mechanism.

12. The trolley frame according to claim 11, wherein the height adjustment locking mechanism includes a support base having a first through-channel, the first through-channel being a U-shaped channel, wherein one end of the first traction member away from the first release member extends into the U-shaped channel from one opening and extends out from the other opening of the U-shaped channel, such that the first traction member is arranged around the support base.

13. The trolley frame according to claim 9, wherein the upper handrail is slidable relative to the lower handrail, and the height adjustment locking mechanism comprises: The second locking part is installed on the lower handframe; A second locking element is movably disposed on the upper frame and adapted to lock into the second locking part; and a second traction member is connected between the second release member and the second locking element; when the second locking element extends into the second locking part to lock into place, the upper frame is restricted from sliding relative to the lower frame; when the second release member drives the second locking element to retract from the second locking part through the second traction member to release the engagement, the upper frame is allowed to slide relative to the lower frame; Alternatively, the height adjustment locking mechanism may include: a first connecting seat connected to the upper frame; a second connecting seat connected to the lower 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 between them; a driving member movably disposed between the first connecting seat or the second connecting seat, the driving member passing axially through the first connecting seat or the second connecting seat and abutting 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, the second traction member driving the second locking member to move via the driving member when the second unlocking member is operated, to allow the first connecting seat to pivot relative to the second connecting seat.

14. The trolley frame according to claim 13, wherein the height adjustment locking mechanism further includes a support base having a first through-channel and a second through-channel, the first through-channel being a U-shaped channel and the second through-channel being a straight channel, the second traction member being accommodated in the straight channel; the wheel locking mechanism includes a first traction member disposed within the wheel frame and the handframe and passing through the U-shaped channel.

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