Baby carriage frame reliable to use

Abstract

The invention discloses a reliable-to-use buggy frame which is characterized in that a folding angle control mechanism is used for stopping a front foot rod from continuously rotating towards one side of a rear foot rod when the front foot rod rotates and is folded to a preset angle relative to the rear foot rod, so that the front foot rod keeps an opening angle relative to the rear foot rod; according to the folding frame, the phenomena of side turning, toppling and the like caused by unstable position of the frame due to the fact that the distance between the front foot rod and the rear foot rod is too small in the folding process of the frame can be effectively avoided, and therefore it can be effectively ensured that the frame is stably in a standing use state, and a user can lift and use the frame conveniently.

Description

[Technical field]

[0001] The invention relates to the technical field of children's travel products, in particular to a reliable frame for a children's bicycle. [Background technology]

[0002] Children's strollers have become an indispensable product in the growth process of infants and young children. Currently, many children's strollers on the market include a foldable children's stroller frame and a foldable child seat connected to the children's stroller frame.

[0003] At present, when the frame of a child stroller is folded, the front foot rod is usually rotated toward the rear foot rod to make the folded child stroller frame stand up as a whole for the user to lift, that is, the lower ends of the front foot rod and the rear foot rod touch the ground at the same time. However, due to the design structure and subsequent packaging and transportation requirements, the front foot rod of the current child stroller frame needs to be kept close to the rear foot rod, so that the angle between the front foot rod and the rear foot rod is small, which makes the child stroller frame in the standing state easily fall forward when the handle is unfolded, affecting the unfolding and use, and causing inconvenience to the user.

[0004] In addition, in order to facilitate the use of the children's bicycle frames on the market, the front wheel group is usually a universal wheel and the rear wheel group is usually a fixed wheel. Since the front wheel group can rotate relative to the front foot rod, when the children's bicycle frame is folded, it is easy to cause interference between the front wheel group and the rear wheel group during the folding process, affecting the smooth folding, resulting in inconvenience in folding; and after folding, due to the uncertainty of the rotation of the front wheel group, it will also affect whether the whole bicycle can be folded to the minimum volume.

[0005] Therefore, the present invention is studied and proposed in view of the above problems. [Summary of the invention]

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a reliable children's bicycle frame. When the front foot rod is rotated and folded to a preset angle relative to the rear foot rod, the front foot rod is blocked from continuing to fold toward the rear foot rod side through a folding angle control mechanism, so that the front foot rod maintains an open angle relative to the rear foot rod. This can effectively prevent the frame from standing unstable and causing overturning, tipping, etc. due to the small distance between the front foot rod and the rear foot rod during the folding and standing process of the frame. For this reason, the use of the present invention can effectively ensure that the frame is in a stable standing folded use state, which is convenient for users to lift and use.

[0007] The present invention is achieved through the following technical solutions:

[0008] A reliable child bicycle frame, which can be switched between an unfolded state and a folded state, comprises:

[0009] A front foot rod 1, the lower end of which is connected to a front wheel set 11;

[0010] A rear foot rod 2, wherein the rear foot rod 2 is rotatably connected to the front foot rod 1, and a rear wheel set 21 is connected to the lower end of the rear foot rod 2;

[0011] A push rod 3, the lower end of which is rotatably connected to the front foot rod 1 or the rear foot rod 2;

[0012] A folding angle control mechanism 4, the folding angle control mechanism 4 is located between the front foot bar 1 and the rear foot bar 2, and the folding angle control mechanism 4 is configured to prevent the front foot bar 1 from further folding toward the rear foot bar 2 when the front foot bar 1 rotates and folds relative to the rear foot bar 2 to a preset angle, so that the front foot bar 1 maintains an open angle relative to the rear foot bar 2 to ensure that the frame is stably in a standing folded state, and to prevent the frame from tipping over during the initial action of switching from the folded state to the unfolded state;

[0013] A linkage mechanism 5, the linkage mechanism 5 is located between the front foot rod 1, the rear foot rod 2 and the push rod 3, and the linkage mechanism 5 is configured to link the front foot rod 1 with the rear foot rod 2 so that it is folded or unfolded accordingly when the push rod 3 rotates relative to the rear foot rod 2;

[0014] A frame locking mechanism, the frame locking mechanism is located between the rear foot rod 2 and the push rod 3 and is used to lock the frame in an unfolded use state;

[0015] The frame unlocking mechanism is located on the rear foot rod 2 or the push rod 3 and is used to link the unlocking action of the frame locking mechanism to release the locked state of the frame.

[0016] As described above, the frame of the child bicycle is reliable to use, and the folding angle control mechanism 4 is also configured to release the obstruction of the front leg rod 1, so that the front leg rod 1 can be further rotated and folded toward the side of the rear leg rod 2 so that the frame is in a fully folded state for use.

[0017] As described above, a reliable children's car frame is provided, wherein a rear connecting rod 22 is provided between the upper parts of the two rear leg rods 2, and a front connecting seat 23 rotatably connected to the upper end of the front leg rod 1 is provided on the rear connecting rod 22; the folding angle control mechanism 4 is located between the front leg rod 1 and the rear connecting rod 22.

[0018] As described above, a reliable children's vehicle frame is provided, wherein the folding angle control mechanism 4 includes an angle control mounting seat 41 arranged on the front foot rod 1 or the rear connecting rod 22, and the angle control mounting seat 41 is movably provided with an angle control blocking member 42 for blocking the front foot rod 1 from continuing to fold toward the rear foot rod 2 when the front foot rod 1 is rotated relative to the rear foot rod 2 to be folded to a preset angle, and an angle control resetting member for driving the angle control blocking member 42 to elastically return to its original position is provided between the angle control blocking member 42 and the angle control mounting seat 41.

[0019] As described above, a reliable children's vehicle frame is provided, wherein the angle control blocking member 42 is slidably disposed on the angle control mounting seat 41, and the angle control blocking member 42 has an angle control blocking portion 421 for blocking and cooperating with the corresponding front foot rod 1 or rear foot rod 2 and an angle control avoiding portion 422 for avoiding the corresponding front foot rod 1 or rear foot rod 2.

[0020] As described above, a reliable children's vehicle frame is provided, wherein the linkage mechanism 5 includes a first linkage member 51, a second linkage member 52 and a third linkage member 53, wherein the upper end of the first linkage member 51 is rotatably connected to the lower portion of the push rod 3, the lower end of the first linkage member 51 is rotatably connected to an extended connection end 521 raised in the middle portion of the second linkage member 52, the rear end of the second linkage member 52 is rotatably connected to the upper portion of the rear foot rod 2, the front end of the second linkage member 52 is rotatably connected to the rear end of the third linkage member 53, and the front end of the third linkage member 53 is rotatably connected to the upper portion of the front foot rod 1.

[0021] As described above, in the reliable use of the children's bicycle frame, the front wheel set 11, the rear wheel set 21 and the upper end of the push rod 3 are configured to be supported on the support surface at the same time when the frame is in the standing folded use state.

[0022] As described above, a reliable children's bicycle frame is provided, wherein the push rod 3 is connected with a handrail 8 which can be linked by a linkage mechanism 5, and the handrail 8 is configured to be linked and flipped to an upward state when the frame is in a standing folded state for use, so as to facilitate the user to lift it.

[0023] As described above, a reliable baby stroller frame is provided, wherein the armrest rod 8 comprises an armrest seat 81 hinged to the push rod 3 and an armrest portion 82 connected to the armrest seat 81 , and the lower end of the armrest seat 81 is connected to the linkage mechanism 5 .

[0024] As described above, a reliable children's bicycle frame is provided, wherein the lower end of the front foot rod 1 is connected to a front wheel group 11 which can rotate relative to the front foot rod 1 around the pivot center axis through a pivot, and a front wheel locking mechanism 6 for locking the front wheel group 11 relative to the front foot rod 1 and limiting the rotation of the front wheel group 11 around the pivot center axis is provided between the front wheel group 11 and the lower end of the front foot rod 1; the frame is also provided with a front wheel linkage mechanism 7 which is used to link the front wheel locking mechanism 6 to operate when the frame is folded to lock the front wheel group 11 relative to the front foot rod 1, thereby making the front wheel group 11 and the rear wheel group 21 parallel to each other.

[0025] As described above, in the reliable use of the children's bicycle frame, the front wheel locking mechanism 6 is configured to be linked with the front wheel linkage mechanism 7 to release the lock of the front wheel set 11 when the frame is in the unfolded use state.

[0026] As described above, a reliable children's vehicle frame is provided, wherein the front wheel locking mechanism 6 comprises a front wheel locking hole 61 eccentrically arranged on the front wheel connecting seat 111 of the front wheel group 11, and a front wheel locking pin 62 movably arranged at the lower end of the front foot rod 1 and elastically insertable into the front wheel locking hole 61, and a locking pin elastic member 63 for driving the front wheel locking pin 62 to elastically return to its original position is provided between the front wheel locking pin 62 and the front foot rod 1; the front wheel locking pin 62 is configured so that the frame is linked by the front wheel linkage mechanism 7 during the folding process.

[0027] As described above, a reliable children's car frame is provided between the upper parts of the two rear foot rods 2, and the rear connecting rod 22 is provided with a front connecting seat 23 rotatably connected to the upper end of the front foot rod 1; a front wheel linkage mechanism 7 for linking the corresponding action of the front wheel locking pin 62 is provided between the front connecting seat 23 and the front foot rod 1, and the front wheel linkage mechanism 7 includes a front wheel sliding member 71 slidably provided on the front foot rod 1, and the front wheel sliding member 71 is connected to the front wheel locking pin 62 through the front wheel linkage member 72; the front wheel linkage mechanism 7 also includes a front wheel locking driving member 73 provided on the front connecting seat 23, and the front wheel locking driving member 73 is provided with a front wheel driving part 731 for linking the front wheel sliding member 71 to slide accordingly during the corresponding rotation of the front foot rod 1 relative to the rear foot rod 2, thereby allowing the front wheel locking pin 62 to insert into or exit the front wheel locking hole 61.

[0028] As described above, a reliable children's vehicle frame also includes a seat frame 9, which includes a rear seat portion 91 relatively fixedly connected to the lower end of the push rod 3, and a front seat portion 92 is rotatably connected to the front side of the rear seat portion 91. The front seat portion 92 is connected to the front leg rod 1 through a seat support rod 93, and the upper end of the seat support rod 93 is rotatably connected to the front of the front seat portion 92, and the lower end of the seat support rod 93 is rotatably connected to the upper part of the front leg rod 1.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. The folding angle control mechanism of the present invention blocks the front foot rod from further folding toward the side of the rear foot rod when the front foot rod is rotated and folded to a preset angle relative to the rear foot rod, so that the front foot rod maintains an open angle relative to the rear foot rod, which can effectively prevent the frame from standing unstable and causing overturning or tipping due to the small distance between the front foot rod and the rear foot rod during the folding and standing process of the frame. Therefore, the present invention can effectively ensure that the frame is in a stable standing folded use state, which is convenient for users to lift and use; at the same time, the folding angle control mechanism makes the front foot rod maintain an open angle relative to the rear foot rod, so that the frame can be effectively prevented from tipping during the initial action of switching the frame from the folded use state to the unfolded use state, and it is also convenient for the front foot rod to rotate forward relative to the rear foot rod and unfold smoothly, which is reliable and convenient to use.

[0031] 2. In order to minimize the volume of the folded frame and facilitate subsequent packaging, transportation and other operations, the folding angle control mechanism is also configured to release the obstruction of the front leg rod, allowing the front leg rod to be further rotated and folded toward the rear leg rod so that the frame is in a fully folded use state.

[0032] 3. For the convenience of use and to ensure the stability of the frame structure, the linkage mechanism is configured so that when the push rod rotates relative to the rear foot rod, the front foot rod is linked to the rear foot rod for corresponding folding or unfolding. It is only necessary to control the push rod to rotate relative to the rear foot rod to fold or unfold, and the front foot rod can be controlled to rotate relative to the rear foot rod to fold or unfold. In other words, only one operation is needed to cause the frame to rotate, fold or unfold, and the operation is simple and convenient.

[0033] 4. The present invention only requires one set of frame locking mechanism and linkage mechanism to lock the frame as a whole, and only requires one set of frame unlocking mechanism to unlock the frame as a whole. The operation and use are convenient and the design is reasonable.

[0034] 5. The present invention locks the front wheel assembly relative to the front foot rod through the front wheel locking mechanism to limit the front wheel assembly from rotating around the pivot center axis, which can avoid the front wheel assembly from interfering with the rear wheel assembly or other parts of the frame during the folding process of the frame, which is conducive to the smooth folding of the frame and has the characteristic of easy folding; at the same time, it can ensure that the entire vehicle in the folded use state is completely folded, which is convenient for carrying and storage.

[0035] 6. In order to ensure that the frame stands more stably, the front wheel set, the rear wheel set and the upper end of the push rod are configured to be supported on the support surface at the same time when the frame is in a standing folded use state.

[0036] 7. In order to facilitate users to lift, the push rod is connected to a handrail that can be linked by a linkage mechanism. The handrail is configured to be linked and flipped to an upward state when the frame is in a standing folded use state to facilitate users to lift.

Brief Description of the Drawings

[0037] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0038] Figure 1 This is one of the three-dimensional diagrams of the present invention in the unfolded use state.

[0039] Figure 2 This is the second stereoscopic diagram of the present invention in the unfolded use state.

[0040] Figure 3 The third is a three-dimensional diagram of the present invention in an unfolded use state.

[0041] Figure 4 It is a side view of the present invention in an unfolded use state.

[0042] Figure 5 It is a three-dimensional diagram of the present invention in a standing folded use state.

[0043] Figure 6 It is a side view of the present invention in a standing folded use state.

[0044] Figure 7 It is a side view of the present invention in a fully folded and stowed state for use.

[0045] Figure 8 It is a structural schematic diagram of the folding angle control mechanism in the present invention.

[0046] Fig. 9 It is a cross-sectional view of the front wheel locking mechanism in the present invention.

[0047] Fig.10 It is a structural schematic diagram of the front wheel unlocking mechanism in the present invention.

[0048] Fig.11 It is an exploded view of the front wheel unlocking mechanism in the present invention. [Specific implementation method]

[0049] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0050] like Figure 1-11 As shown, the present invention provides a reliable child bicycle frame, which can be switched between an unfolded use state and a folded use state, and comprises:

[0051] A front foot rod 1, the lower end of which is connected to a front wheel set 11;

[0052] A rear foot rod 2, wherein the rear foot rod 2 is rotatably connected to the front foot rod 1, and a rear wheel set 21 is connected to the lower end of the rear foot rod 2;

[0053] A push rod 3, the lower end of which is rotatably connected to the front foot rod 1 or the rear foot rod 2;

[0054] A folding angle control mechanism 4, the folding angle control mechanism 4 is located between the front foot bar 1 and the rear foot bar 2, and the folding angle control mechanism 4 is configured to prevent the front foot bar 1 from further folding toward the rear foot bar 2 when the front foot bar 1 rotates and folds relative to the rear foot bar 2 to a preset angle, so that the front foot bar 1 maintains an open angle relative to the rear foot bar 2 to ensure that the frame is stably in a standing folded state, and to prevent the frame from tipping over during the initial action of switching from the folded state to the unfolded state;

[0055] A linkage mechanism 5, the linkage mechanism 5 is located between the front foot rod 1, the rear foot rod 2 and the push rod 3, and the linkage mechanism 5 is configured to link the front foot rod 1 with the rear foot rod 2 so that it is folded or unfolded accordingly when the push rod 3 rotates relative to the rear foot rod 2;

[0056] A frame locking mechanism, the frame locking mechanism is located between the rear foot rod 2 and the push rod 3 and is used to lock the frame in an unfolded use state;

[0057] The frame unlocking mechanism is located on the rear foot rod 2 or the push rod 3 and is used to link the unlocking action of the frame locking mechanism, thereby releasing the locked state of the frame. The present invention uses the folding angle control mechanism to block the front foot rod from continuing to fold toward the side of the rear foot rod when the front foot rod rotates and folds to a preset angle relative to the rear foot rod, so that the front foot rod maintains an open angle relative to the rear foot rod, which can effectively prevent the frame from standing unsteadily due to the small distance between the front foot rod and the rear foot rod during the folding and standing process of the frame, resulting in the phenomenon of overturning, tipping, etc. For this reason, the present invention can effectively ensure that the frame is in a stable standing folded use state, which is convenient for users to lift and use; at the same time, the folding angle control mechanism makes the front foot rod maintain an open angle relative to the rear foot rod, so that the frame can effectively avoid tipping when the frame switches from the folded use state to the unfolded use state, and it is also convenient for the front foot rod to rotate forward relative to the rear foot rod and unfold smoothly, which is reliable and convenient to use.

[0058] The present invention can realize the functions of stable folding and standing and stable and smooth unfolding with one key.

[0059] Furthermore, through the folding angle control mechanism, the whole vehicle can remain upright when folded and will not fall over when unfolded, and can be further folded to minimize the folded volume of the whole vehicle, so as to facilitate packaging and transportation, carrying outside, and storage when not in use.

[0060] The frame locking mechanism in the present invention is used to lock the push rod relative to the rear foot rod, and the frame unlocking mechanism is arranged on the push rod. The structure of the frame locking mechanism can refer to the frame locking mechanism of a foldable children's stroller with application number 202321203527.5, and the structure of the frame unlocking mechanism can refer to the handlebar unlocking mechanism of a foldable children's stroller frame with application number 202323413075.6.

[0061] In order to minimize the volume of the folded frame and facilitate subsequent packaging, transportation and other operations, the folding angle control mechanism 4 is also configured to release the obstruction of the front foot rod 1, so that the front foot rod 1 can be further rotated and folded toward the side of the rear foot rod 2 to put the frame in a fully folded state for use. When the frame needs to be packaged or transported, the user operates the folding angle control mechanism 4 to displace the angle control blocking portion 421 from the front foot rod, that is, the angle control blocking portion 421 releases the obstruction of the front foot rod, and then operates the front foot rod to continue rotating and folding toward the side of the rear foot rod until the front foot rod and the rear foot rod are close together and the frame is in a fully folded state for use.

[0062] like Figure 1-7 As shown, in order to improve the structural strength and stability between the two rear foot rods, a rear connecting rod 22 is provided between the upper parts of the two rear foot rods 2, and a front connecting seat 23 rotatably connected to the upper end of the front foot rod 1 is provided on the rear connecting rod 22; the folding angle control mechanism 4 is located between the front foot rod 1 and the rear connecting rod 22. Figure 3 As shown, the upper ends of the two front leg rods 1 are connected by a front connecting rod to form a U-shaped connection structure, which can also improve its structural strength, thereby ensuring the stability and reliability of the entire frame.

[0063] like Figure 2 As shown, a lower connecting rod is provided between the lower parts of the two rear foot rods 2.

[0064] like Figure 1 , 3 As shown in Figures 5 and 8, in order to reliably block the front foot rod to ensure that the front foot rod is opened relative to the rear foot rod, the folding angle control mechanism 4 includes an angle control mounting seat 41 arranged on the front foot rod 1 or the rear connecting rod 22, and the angle control mounting seat 41 is movably provided with an angle control blocking member 42 for blocking the front foot rod 1 from continuing to fold toward the rear foot rod 2 when the front foot rod 1 rotates and folds to a preset angle relative to the rear foot rod 2, and an angle control reset member for driving the angle control blocking member 42 to elastically reset is arranged between the angle control blocking member 42 and the angle control mounting seat 41. In this embodiment, the angle control reset member can be a compression spring or a spring to ensure that the angle control blocking member 42 remains in an extended blocking state, such as Figure 7 shown.

[0065] like Figure 1 , 3As shown in Figures 5, 8, the angle control blocking member 42 is slidably disposed on the angle control mounting seat 41, and the angle control blocking member 42 has an angle control blocking portion 421 for blocking and cooperating with the corresponding front foot rod 1 or rear foot rod 2 and an angle control avoiding portion 422 for avoiding the corresponding front foot rod 1 or rear foot rod 2. When the frame needs to be packaged or transported, the user presses the angle control blocking member 42 to retract the angle control blocking member 42 into the angle control mounting seat 41, so that the angle control blocking portion 421 is misaligned with the front foot rod and the angle control avoiding portion 422 cooperates with the front foot rod, and then the front foot rod is operated to rotate and move closer to the side of the rear foot rod to put the frame in a fully folded and folded use state. At this moment, the side wall of the front foot rod blocks and cooperates with the corresponding end wall of the angle control blocking member 42 to prevent the angle control blocking member 42 from elastically extending to avoid interference.

[0066] In other embodiments, the angle control blocking member 42 is rotatably disposed on the angle control mounting seat 41 .

[0067] like Figure 1-7 As shown, in order to make the linkage more reliable and efficient, the linkage mechanism 5 includes a first linkage member 51, a second linkage member 52 and a third linkage member 53, the upper end of the first linkage member 51 is rotatably connected to the lower part of the push rod 3, the lower end of the first linkage member 51 is rotatably connected to the extended connection end 521 protruding in the middle of the second linkage member 52, the rear end of the second linkage member 52 is rotatably connected to the upper part of the rear foot rod 2, the front end of the second linkage member 52 is rotatably connected to the rear end of the third linkage member 53, and the front end of the third linkage member 53 is rotatably connected to the upper part of the front foot rod 1. When folding, the push rod flips downward relative to the rear foot rod, and the push rod drives the second linkage member 52 to flip downward around the rotation axis between the rear end of the second linkage member 52 and the upper part of the rear foot rod 2 through the first linkage member 51, and the front end of the second linkage member 52 pulls the front foot rod to rotate and fold to one side of the rear foot rod through the third linkage member 53, so that the folding is convenient and reliable.

[0068] like Figure 6 As shown, in order to make the frame stand more stably, the front wheel set 11, the rear wheel set 21 and the upper end of the push rod 3 are configured to be supported on the support surface at the same time when the frame is in the standing folded use state. In this embodiment, the front wheel set 11 and the upper end of the push rod 3 are supported on the support surface respectively, which can effectively prevent the frame from tipping forward or backward in the standing folded use state, thereby ensuring the frame to stand stably.

[0069] like Figure 5 , 6 As shown, for the convenience of lifting, the push rod 3 is connected with a handrail 8 which can be linked by a linkage mechanism 5. The handrail 8 is configured to be linked and flipped to an upward state when the frame is in a standing folded use state to facilitate lifting by the user.

[0070] Further, the armrest rod 8 includes an armrest seat 81 hinged to the push rod 3 and an armrest portion 82 connected to the armrest seat 81, and the lower end of the armrest seat 81 is connected to the linkage mechanism 5. In this embodiment, the lower end of the armrest seat 81 is connected to the upper end of the first linkage member 51 to move accordingly with the movement of the first linkage member 51.

[0071] For the convenience of subsequent packaging and transportation, the armrest portion 82 is detachably connected to the armrest seat 81, so the armrest portion 82 can be removed from the armrest seat 81 for separation or independent packaging and transportation. In other embodiments, the armrest portion 82 is rotatably connected to the armrest seat 81, and the armrest portion 82 can be operated to rotate and fold accordingly to reduce the overall volume of the frame in the folded use state.

[0072] like Figure 9-11 As shown, the lower end of the front foot rod 1 is connected to a front wheel assembly 11 which can rotate relative to the front foot rod 1 around the central axis of the pivot through a pivot, and a front wheel locking mechanism 6 is provided between the front wheel assembly 11 and the lower end of the front foot rod 1 for locking the front wheel assembly 11 relative to the front foot rod 1 and limiting the rotation of the front wheel assembly 11 around the central axis of the pivot. In this embodiment, the front wheel assembly 11 is locked relative to the front foot rod 1 through the front wheel locking mechanism 6, which can avoid the interference between the front wheel assembly and the rear wheel assembly or other parts of the frame during the folding process of the frame, which is conducive to the smooth folding of the frame and has the characteristic of convenient folding; at the same time, it can ensure that the whole vehicle in the folded use state is completely folded, which is convenient for carrying and storage. Among them, the front wheel locking mechanism 6 can lock the front wheel assembly 11 in the folded use state relative to the front foot rod 1.

[0073] Furthermore, the frame is also provided with a front wheel linkage mechanism 7 for linking the front wheel locking mechanism 6 to lock the front wheel set 11 relative to the front foot rod 1 when the frame is folded, thereby making the front wheel set 11 and the rear wheel set 21 parallel to each other. And preferably, when the frame is in the folded state, the front wheel locking mechanism 6 locks the two front wheel sets 11 and is located outside the two rear wheel sets. Therefore, when the frame is folded, the front wheel set and the rear wheel set on the same side completely overlap, so that the front foot rod and the rear foot rod are folded closer together, and the frame structure after folding is more compact and the overall volume is minimized.

[0074] The front wheel locking mechanism 6 is configured to be linked with the front wheel linkage mechanism 7 to unlock the front wheel group 11 when the frame is in the unfolded use state. Therefore, the user does not need to manually operate the front wheel locking mechanism 6 to unlock the front wheel group when the frame is unfolded for use, thereby reducing the operating steps and facilitating use.

[0075] like Fig. 9As shown, in order to ensure reliable locking, the front wheel locking mechanism 6 includes a front wheel locking hole 61 eccentrically arranged on the front wheel connecting seat 111 of the front wheel group 11 and a front wheel locking pin 62 movably arranged at the lower end of the front foot rod 1 and elastically inserted into the front wheel locking hole 61, and a locking pin elastic member 63 for driving the front wheel locking pin 62 to elastically return to its original position is arranged between the front wheel locking pin 62 and the front foot rod 1; the front wheel locking pin 62 is configured to be linked by the front wheel linkage mechanism 7 during the folding process of the frame. Preferably, the front wheel locking pin 62 is configured to be linked by the front wheel linkage mechanism 7 located between the front foot rod and the front connecting seat during the folding process of the front foot rod rotating relative to the rear foot rod. Among them, the locking pin elastic member 63 can be a compression spring or a tension spring, etc.

[0076] like Fig.10 , 11 As shown, in order to facilitate unlocking, a rear connecting rod 22 is provided between the upper parts of the two rear foot rods 2, and a front connecting seat 23 rotatably connected to the upper end of the front foot rod 1 is provided on the rear connecting rod 22; a front wheel linkage mechanism 7 for linking the corresponding action of the front wheel locking pin 62 is provided between the front connecting seat 23 and the front foot rod 1, and the front wheel linkage mechanism 7 includes a front wheel sliding member 71 slidably provided on the front foot rod 1, and the front wheel sliding member 71 is connected to the front wheel locking pin 62 through the front wheel linkage member 72; the front wheel linkage mechanism 7 also includes a front wheel locking driving member 73 provided on the front connecting seat 23, and a front wheel locking driving member 73 is provided with a front wheel driving part 731 for linking the front wheel sliding member 71 to slide accordingly when the front foot rod 1 rotates relative to the rear foot rod 2, thereby allowing the front wheel locking pin 62 to insert into or exit the front wheel locking hole 61.

[0077] The front wheel linkage 72 can be a hard rod or a flexible pull rope, etc., and the front wheel driving part 731 can be a front wheel driving inclined plane. When the front foot rod is rotated and folded toward the rear foot rod, the front wheel unlocking protrusion of the front wheel sliding member 71 moves from the high position of the front wheel driving part 731 to the low position of the front wheel driving part 731 to release the limiting effect on the front wheel sliding member 71, and the front wheel sliding member 71 cancels the pulling of the front wheel locking pin 62. At this moment, the front wheel locking pin 62 is automatically inserted into the front wheel locking hole 61 under the elastic force of the locking pin elastic member 63 to lock the front wheel assembly 11 relative to the front foot rod 1, and at the same time, the front wheel locking pin 62 drives the front wheel sliding member 71 to slide away from the front connecting seat 23 through the front wheel linkage 72.

[0078] When the front foot rod is rotated and unfolded relative to the rear foot rod, the front wheel unlocking protrusion of the front wheel sliding member 71 moves from the low position of the front wheel driving part 731 to the high position of the front wheel driving part 731 to drive the front wheel sliding member 71 to slide accordingly, and the front wheel sliding member 71 pulls the front wheel locking pin 62 to move accordingly through the front wheel linkage member 72, so that the front wheel locking pin 62 withdraws from the front wheel locking hole 61 to release the locking state of the front wheel assembly 11 relative to the front foot rod 1. For this reason, the present embodiment only needs to operate and control the retraction and extension of the front foot rod to correspondingly link the locking state or unlocking state of the front wheel locking mechanism 6, which is convenient to use.

[0079] like Figure 1-7 As shown, in order to facilitate folding and unfolding, a seat frame 9 is further included, which includes a rear seat portion 91 relatively fixedly connected to the lower end of the push rod 3, a front seat portion 92 rotatably connected to the front side of the rear seat portion 91, the front seat portion 92 is connected to the front foot rod 1 via a seat support rod 93, the upper end of the seat support rod 93 is rotatably connected to the front part of the front seat portion 92, and the lower end of the seat support rod 93 is rotatably connected to the upper part of the front foot rod 1.

[0080] like Figure 1-7 As shown, in order to minimize the volume after folding, the push rod 3 includes a lower rod whose lower end is rotatably connected to the upper end of the rear foot rod 2 and an upper rod rotatably or slidably connected to the lower rod, an upper rod locking mechanism for locking the lower rod relative to the upper rod is provided between the upper rod and the lower rod, and an upper rod unlocking mechanism for interlocking the unlocking action of the upper rod locking mechanism is provided on the upper rod. The structure of the upper rod locking mechanism and the upper rod unlocking mechanism can refer to the structure of a foldable child stroller frame with application number 202323413075.6.

[0081] Among them, the frame unlocking mechanism is configured to be used to link the unlocking action of the frame locking mechanism when the upper rod is rotated and folded to a preset angle relative to the lower rod, and the operation and use are convenient.

[0082] In order to realize automatic folding, a folding torsion spring is provided between the upper end of the lower rod and the upper end of the lower rod, which is used to drive the upper rod to flip forward relative to the lower rod and fold forward, and the folding operation is realized automatically without the user having to perform additional operations to flip the upper rod forward relative to the lower rod.

Claims

1. A reliable children's bicycle frame, which can be switched between an unfolded state and a folded state, characterized in that include: A front foot rod (1), the lower end of which is connected to a front wheel set (11); A rear foot rod (2), the rear foot rod (2) being rotatably connected to the front foot rod (1), and the lower end of the rear foot rod (2) being connected to a rear wheel set (21); A push rod (3), the lower end of which is rotatably connected to the front foot rod (1) or the rear foot rod (2); A folding angle control mechanism (4), the folding angle control mechanism (4) being located between the front foot bar (1) and the rear foot bar (2), the folding angle control mechanism (4) being configured to prevent the front foot bar (1) from continuing to fold toward the rear foot bar (2) when the front foot bar (1) is rotated and folded relative to the rear foot bar (2) to a preset angle, so that the front foot bar (1) maintains an open angle relative to the rear foot bar (2) to ensure that the frame is stably in a standing folded use state, and to prevent the frame from tipping over during the initial action of switching from the folded use state to the unfolded use state; A linkage mechanism (5), the linkage mechanism (5) being located between the front foot rod (1), the rear foot rod (2) and the push rod (3), the linkage mechanism (5) being configured to link the front foot rod (1) with the rear foot rod (2) to move toward, fold or unfold accordingly when the push rod (3) rotates relative to the rear foot rod (2); A frame locking mechanism, the frame locking mechanism being located between the rear foot rod (2) and the push rod (3) and being used to lock the frame in an unfolded use state; A frame unlocking mechanism is located on the rear foot rod (2) or the push rod (3) and is used to link the unlocking action of the frame locking mechanism, thereby releasing the locked state of the frame.

2. A reliable children's bicycle frame according to claim 1, characterized in that The folding angle control mechanism (4) is also configured to release the obstruction of the front foot rod (1), allowing the front foot rod (1) to be further rotated and folded toward the side of the rear foot rod (2) so that the frame is in a fully folded state for use.

3. A reliable children's bicycle frame according to claim 1, characterized in that A rear connecting rod (22) is provided between the upper parts of the two rear foot rods (2), and a front connecting seat (23) rotatably connected to the upper end of the front foot rod (1) is provided on the rear connecting rod (22); The folding angle control mechanism (4) is located between the front foot rod (1) and the rear connecting rod (22); the folding angle control mechanism (4) comprises an angle control mounting seat (41) arranged on the front foot rod (1) or the rear connecting rod (22); the angle control mounting seat (41) is movably provided with an angle control blocking member (42) for blocking the front foot rod (1) from further folding toward the rear foot rod (2) when the front foot rod (1) is rotated and folded relative to the rear foot rod (2) to a preset angle; an angle control resetting member for driving the angle control blocking member (42) to elastically reposition is provided between the angle control blocking member (42) and the angle control mounting seat (41).

4. A reliable children's bicycle frame according to claim 3, characterized in that The angle control blocking member (42) is slidably arranged on the angle control mounting seat (41), and comprises an angle control blocking portion (421) for blocking and cooperating with the corresponding front foot rod (1) or rear foot rod (2) and an angle control avoiding portion (422) for avoiding the corresponding front foot rod (1) or rear foot rod (2).

5. A reliable children's bicycle frame according to claim 1, characterized in that The linkage mechanism (5) comprises a first linkage member (51), a second linkage member (52) and a third linkage member (53); the upper end of the first linkage member (51) is rotatably connected to the lower part of the push rod (3); the lower end of the first linkage member (51) is rotatably connected to an extended connection end (521) protruding in the middle of the second linkage member (52); the rear end of the second linkage member (52) is rotatably connected to the upper part of the rear foot rod (2); the front end of the second linkage member (52) is rotatably connected to the rear end of the third linkage member (53); and the front end of the third linkage member (53) is rotatably connected to the upper part of the front foot rod (1).

6. A reliable children's bicycle frame according to claim 1, characterized in that The push rod (3) is connected to a handrail (8) which can be linked by a linkage mechanism (5). The handrail (8) is configured to be linked and flipped to an upward state when the frame is in a standing folded use state to facilitate lifting by a user.

7. A reliable child bicycle frame according to claim 6, characterized in that The armrest rod (8) comprises an armrest seat (81) hinged to the push rod (3) and an armrest portion (82) connected to the armrest seat (81); the lower end of the armrest seat (81) is connected to the linkage mechanism (5).

8. A reliable children's bicycle frame according to any one of claims 1 to 7, characterized in that The lower end of the front foot rod (1) is connected to a front wheel assembly (11) via a pivot and can rotate relative to the front foot rod (1) around the central axis of the pivot; a front wheel locking mechanism (6) is provided between the front wheel assembly (11) and the lower end of the front foot rod (1) for locking the front wheel assembly (11) relative to the front foot rod (1) and limiting the rotation of the front wheel assembly (11) around the central axis of the pivot; the frame is also provided with a front wheel linkage mechanism (7) for linking the front wheel locking mechanism (6) to lock the front wheel assembly (11) relative to the front foot rod (1) when the frame is folded, thereby making the front wheel assembly (11) and the rear wheel assembly (21) parallel to each other; The front wheel locking mechanism (6) is configured to be linked with the front wheel linkage mechanism (7) to release the lock on the front wheel group (11) when the vehicle frame is in an unfolded use state.

9. A reliable child bicycle frame according to claim 8, characterized in that The front wheel locking mechanism (6) comprises a front wheel locking hole (61) eccentrically arranged on a front wheel connecting seat (111) of the front wheel assembly (11) and a front wheel locking pin (62) movably arranged at the lower end of the front foot rod (1) and capable of elastically inserting into the front wheel locking hole (61); a locking pin elastic member (63) for driving the front wheel locking pin (62) to elastically return to its original position is arranged between the front wheel locking pin (62) and the front foot rod (1); the front wheel locking pin (62) is configured so that the frame is linked by the front wheel linkage mechanism (7) during the folding process.

10. A reliable child bicycle frame according to claim 9, characterized in that A rear connecting rod (22) is provided between the upper parts of the two rear foot rods (2), and a front connecting seat (23) is provided on the rear connecting rod (22) and is rotatably connected to the upper end of the front foot rod (1); the front wheel linkage mechanism (7) is located between the front connecting seat (23) and the front foot rod (1), and the front wheel linkage mechanism (7) includes a front wheel sliding member (71) slidably provided on the front foot rod (1), and the front wheel sliding member (71) is connected to the front wheel locking pin (62) through the front wheel linkage member (72); the front wheel linkage mechanism (7) also includes a front wheel locking driving member (73) provided on the front connecting seat (23), and the front wheel locking driving member (73) is provided with a front wheel driving part (731) for linking the front wheel sliding member (71) to slide accordingly when the front foot rod (1) rotates relative to the rear foot rod (2), thereby allowing the front wheel locking pin (62) to insert into or exit the front wheel locking hole (61).

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