A children's tricycle

Abstract

The invention discloses a children's tricycle, comprising a support frame, a front support frame capable of rotating relative to the front support frame around a first axis A is connected to the front support frame, a steering device is connected to the front support frame, the steering device comprises a rotating frame capable of rotating relative to the front support frame around a second axis B, a front wheel assembly is arranged at the lower end of the rotating frame, a steering handle is connected to the upper end of the rotating frame, a rear support frame is connected to the rear end of the support frame, the rear support frame comprises a left support part and a right support part arranged on both sides of a symmetry plane SP, the left support part is rotatably connected to the support frame around a third axis C, the left support part comprises a left rear leg and a left rear wheel arranged at the lower end of the left rear leg, the right support part is rotatably connected to the support frame around a fourth axis D, the right support part comprises a right rear leg and a right rear wheel arranged at the lower end of the right rear leg; a linkage mechanism is also arranged between the front support frame and the rear support frame, which drives the front support frame to rotate relative to the support frame around the first axis A during the process of the rear support frame rotating relative to the support frame. The invention has a simple structure and occupies a small space after being folded.

Description

[Technical field]

[0001] The invention relates to a children's tricycle. [Background technology]

[0002] At present, three-wheeled baby carriages have become a common product used by children during their growth. In order to facilitate carrying or storage, the three-wheeled baby carriages currently on the market can generally be folded, but the three-wheeled baby carriages currently on the market still have the problem of being large in size after being folded, and still occupy a large space, and there is still room for improvement.

[0003] The present invention is just produced based on the above-mentioned shortcomings. [Summary of the invention]

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a children's tricycle which has a simple structure, is easy to fold and occupies a small space after being folded.

[0005] The present invention is achieved through the following technical solutions:

[0006] A children's tricycle has a vertical symmetry plane SP and can be moved from an unfolded position to a folded position, characterized in that it includes a support frame 1 for supporting a seat, the front end of the support frame 1 is connected to a front support frame 2 that can rotate relative to the support frame around a first axis A, the front support frame 2 is connected to a steering device 3, the steering device 3 includes a rotating frame 31 that can rotate relative to the front support frame 2 around a second axis B, the lower end of the rotating frame 31 is provided with a front wheel assembly 32, the upper end of the rotating frame 31 is connected to a steering handle 33, The rear end of the support frame 1 is connected to a rear support frame 4, and the rear support frame 4 includes a left support portion 41 and a right support portion 42 arranged on both sides of the symmetry plane SP, the left support portion 41 is rotatably connected to the support frame 1 around a third axis C, the left support portion 41 includes a left rear leg 411 and a left rear wheel 412 arranged at the lower end of the left rear leg 411, and the right support portion 42 is rotatably connected to the support frame 1 around a fourth axis D, and the right support portion 42 includes a right rear leg 421 and a right rear wheel 422 arranged at the lower end of the right rear leg 421;

[0007] A linkage mechanism 5 is also provided between the front support frame 2 and the rear support frame 4 for driving the front support frame 2 to rotate relative to the support frame 1 around the first axis A when the rear support frame 4 rotates relative to the support frame 1 .

[0008] The children's tricycle as described above is characterized in that: the third axis C is set at an acute angle with the vertical symmetry plane SP, so that when the left rear leg 411 rotates forward around the third axis C, the left rear wheel 412 can move from a position away from the vertical symmetry plane SP to a position close to the vertical symmetry plane SP;

[0009] The fourth axis D is set at an acute angle with the vertical symmetry plane SP, so that when the right rear leg 421 rotates forward around the fourth axis D, the right rear wheel 422 can move from a position far away from the vertical symmetry plane SP to a position close to the vertical symmetry plane SP.

[0010] The children's tricycle as described above is characterized in that: the front support frame 2 is rotatably connected with the front end of the support frame 1 around the first axis A through the front rotating seat 21, the linkage mechanism 5 includes a linkage member 51 arranged in the support frame 1 and capable of moving in the support frame 1, a left driving gear 52 that cooperates with the linkage member 51 to rotate around the third axis C, and a right driving gear 53 that cooperates with the linkage member 51 to rotate around the fourth axis D, the left driving gear 52 is connected to the left rear leg 411 and can rotate around the third axis C together with the upper end of the left rear leg 411, the right driving gear 53 is connected to the right rear leg 421 and can rotate around the fourth axis D together with the upper end of the right rear leg 421, a transmission member 54 is connected to the front rotating seat 21 and deviates from the first axis A, one end of the transmission member 54 is rotatably connected to the front rotating seat 21 around the fifth axis E, and the other end is rotatably connected to the rotating part 513 on the linkage member 51 around the sixth axis F.

[0011] The children's tricycle as described above is characterized in that: the linkage member 51 includes a left transmission gear 511 and a right transmission gear 512 arranged in the support frame 1, the left transmission gear 511 is meshed with the left drive gear 52 for transmission, the right transmission gear 512 is meshed with the right drive gear 53 for transmission, the rotating part 513 is arranged between the left transmission gear 511 and the right transmission gear 512 and rotates with the left transmission gear 511 and the right transmission gear 512, and the left transmission gear 511, the right transmission gear 512 and the rotating part 513 rotate around the seventh axis G.

[0012] The children's tricycle as described above is characterized in that the left transmission gear 511, the right transmission gear 512, the left driving gear 52 and the right driving gear 53 are all helical gears.

[0013] The children's tricycle as described above is characterized in that: the front support frame 2 is rotatably connected with the front end of the support frame 1 around the first axis A through the front rotating seat 21, the linkage mechanism 5 includes a rotating part 513 rotatably arranged in the support frame 1 and can rotate when the rear support frame 4 rotates relative to the support frame 1, a transmission member 54 is provided between the rotating part 513 and the front rotating seat 21, and can push the front rotating seat 21 to rotate when the rotating part 513 rotates, a locking device is provided between the front support frame 2 and the support frame 1, and the locking device includes a sliding member 61 slidably arranged in the support frame, a first clamping position 211 is provided on the front support frame 2, and can be engaged with or disengaged from the sliding member 61, and a limiting member 62 is also provided in the support frame 1, which can be engaged with the second clamping position 5131 on the rotating part 513 when the sliding member 61 is engaged with the first clamping position 211, and can be driven by the sliding member 61 to disengage from the second clamping position 5131 when the sliding member 61 is disengaged from the first clamping position 211.

[0014] The children's tricycle as described above is characterized in that: the first locking position 211 is provided on the front rotating seat 21, the sliding member 61 includes a sliding block 611 slidably provided in the support frame 1 and a connecting block 612 connected to the sliding block 611 and used to drive the limiting member 62 to disengage from the second locking position 5131, the sliding block 611 is provided with a first pull rope 63 for pulling the sliding block 611 to slide and disengage from the first locking position 211, and the support frame 1 is also provided with a reset spring 64 for driving the sliding block 611 to reset.

[0015] The children's tricycle as described above is characterized in that: a strip hole 6121 is provided on the connecting block 612, and the limiting member 62 includes a limiting block 621 which is rotatably connected to the support frame 1 and abuts against the second clamping position 5131, and a latch 622 which can extend into and move in the strip hole 6121 is provided on the limiting block 621. When the connecting block 612 slides relative to the support frame 1, the inner wall of the strip hole 6121 presses the latch 622 to drive the limiting block 621 to disengage from the second clamping position 5131.

[0016] The children's tricycle as described above is characterized in that: the support frame 1 is also rotatably connected to an unlocking component 7 capable of unlocking the locking device, the unlocking component 7 includes a handle 71 rotatably connected to the support frame 1 and capable of pulling the first cable 63 to disengage the sliding block 621 from the first clamping position 211 when rotating relative to the support frame 1, and the handle 71 is also provided with a resetting element 72 capable of driving the handle 71 to rotate relative to the support frame 1 and reset;

[0017] The support frame 1 is provided with a receiving groove 11, and a concave hole 12 communicating with the receiving groove 11 is also provided on one side of the support frame 1 adjacent to the receiving groove 11. A pressing block 13 that can slide therein is provided in the concave hole 12. The handle 71 is received in the receiving groove 11 and can be pulled up only when the pressing block 13 is pressed. An elastic reset member 14 for driving the pressing block 13 to reset is also provided between the bottom surface of the concave hole 12 and the pressing block 13.

[0018] The children's tricycle as described above is characterized in that: the support frame 1 is also connected to a push rod assembly 8, the support frame 1 is provided with a receiving space 15, the push rod assembly 8 includes a rotating seat 81 arranged in the receiving space 15 and rotatable in the receiving space 15, the rotating seat 81 is detachably connected to a push rod 82, the push rod 82 is provided with an elastic fixing member 821 that can fix the push rod 82 on the rotating seat 81, the elastic fixing member 821 is provided with a first arc-shaped protrusion 8211, the rotating seat 81 is provided with a clamping hole 811 that can accommodate the first arc-shaped protrusion 8211, and the elastic fixing member 821 is also provided with a second arc-shaped protrusion 8212 that can make the first arc-shaped protrusion 8211 disengage from the clamping hole 811 after being pressed.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. When the present invention is folded, the left rear leg rotates forward around the third axis so that the left rear wheel moves from a position away from the front wheel assembly to a position close to the front wheel assembly, and the right rear leg rotates forward around the fourth axis so that the right rear wheel moves from a position away from the front wheel assembly to a position close to the front wheel assembly. When the left rear leg and the right rear leg rotate, the left rear leg and the right rear leg push the linkage mechanism to move, and the linkage mechanism drives the front support frame to rotate upward relative to the support frame around the first axis and approach the support frame, thereby reducing the height of the children's tricycle. After the children's tricycle is folded, it has a small volume and is easy to carry and store. The rotation between the support frame and the front support frame is transmitted through the linkage mechanism, and the structural design is more compact and easier to transmit.

[0021] 2. In the present invention, the third axis is set at an acute angle to the vertical symmetry plane. When the left rear leg rotates forward around the third axis, the left rear wheel can also move from a position away from the vertical symmetry plane to a position plane close to the symmetry plane. At the same time, the fourth axis is also set at an acute angle to the vertical symmetry plane. When the right rear leg rotates forward around the fourth axis, the right rear wheel can also move from a position away from the vertical symmetry plane to a position plane close to the symmetry plane, so that the width of the children's tricycle can be reduced, and the volume of the folded children's tricycle is minimized, which is more convenient to carry and store.

[0022] When the user pulls the handle and lifts the tricycle, the handle pulls the first cable to move, and the first cable pulls the sliding member to make the sliding member disengage from the first locking position. At this time, the front rotating seat and the support frame are unlocked, and the sliding member drives the limiting member to disengage from the second locking position when sliding. At this time, the support frame and the rotating part are unlocked, thereby unlocking the locking device. When the locking device is unlocked, the left support part and the right support part rotate downward under the action of their own weight and approach the front wheel assembly. The left support part and the right support part push the linkage mechanism while rotating, and the linkage mechanism drives the front support frame to rotate upward and move closer to the support frame. Therefore, it is only necessary to pull and lift the handle to unlock the locking device and complete the folding of the entire children's tricycle. The unlocking is simple and the folding is simple. The pressing block and the locking device cooperate to form a two-way lock mechanism of the children's tricycle, which can protect the handle and avoid accidentally touching the handle and causing the children's tricycle to fold.

Brief Description of the Drawings

[0023] Figure 1 It is one of the three-dimensional diagrams of the children's tricycle of the present invention;

[0024] Figure 2 It is one of the plan views of the children's tricycle of the present invention;

[0025] Figure 3 It is the second plan view of the children's tricycle of the present invention;

[0026] Figure 4 This is the second stereoscopic diagram of the children's tricycle of the present invention;

[0027] Figure 5 It is a plan view of the front support frame and the linkage mechanism in the children's tricycle of the present invention;

[0028] Figure 6 It is a stereoscopic diagram of the front support frame and the linkage mechanism of the children's tricycle of the present invention;

[0029] Figure 7 It is a cross-sectional view of the front support frame and the linkage mechanism of the children's tricycle of the present invention;

[0030] Figure 8 yes Figure 7 Enlarged view of the middle H region;

[0031] Fig. 9 It is one of the three-dimensional diagrams of the locking device in the children's tricycle of the present invention;

[0032] Fig.10 This is the second stereoscopic diagram of the locking device in the children's tricycle of the present invention;

[0033] Fig.11 is a cross-sectional view of a children's tricycle of the present invention;

[0034] Fig.12 It is a stereoscopic diagram of a push rod assembly in a children's tricycle of the present invention;

[0035] Fig.13 Fig.12 Enlarged view of the middle J region;

[0036] Fig.14 Fig.11 Enlarged view of the middle I area;

[0037] Fig.15 is a stereoscopic diagram of a steering device in a children's tricycle of the present invention;

[0038] Fig.16 It is one of the plane views of the children's tricycle of the present invention when it is folded;

[0039] Fig.17 This is the second plane view of the children's tricycle of the present invention when it is folded;

[0040] Fig.18 The present invention is a three-dimensional diagram of a children's tricycle when folded. [Specific implementation method]

[0041] The present invention will be further described below in conjunction with the accompanying drawings:

[0042] like Figures 1 to 18 As shown, the present invention provides a children's tricycle, which has a vertical symmetry plane SP and can be moved from an unfolded position to a folded position, and includes a support frame 1 for supporting a seat, the front end of the support frame 1 is connected to a front support frame 2 which can rotate relative to the front support frame 2 around a first axis A, the front support frame 2 is connected to a steering device 3, the steering device 3 includes a rotating frame 31 which can rotate relative to the front support frame 2 around a second axis B, the lower end of the rotating frame 31 is provided with a front wheel assembly 32, the upper end of the rotating frame 31 is connected to a steering handle 33, The rear end of the support frame 1 is connected to a rear support frame 4, and the rear support frame 4 includes a left support portion 41 and a right support portion 42 arranged on both sides of the symmetry plane SP, the left support portion 41 is rotatably connected to the support frame 1 around a third axis C, the left support portion 41 includes a left rear leg 411 and a left rear wheel 412 arranged at the lower end of the left rear leg 411, and the right support portion 42 is rotatably connected to the support frame 1 around a fourth axis D, and the right support portion 42 includes a right rear leg 421 and a right rear wheel 422 arranged at the lower end of the right rear leg 421;

[0043] like Figure 6 As shown, a linkage mechanism 5 is provided between the front support frame 2 and the rear support frame 4 for driving the front support frame 2 to rotate relative to the support frame 1 around the first axis A when the rear support frame 4 rotates relative to the support frame 1 .

[0044] When the children's tricycle is folded, the left rear leg 411 rotates forward around the third axis C to move the left rear wheel 412 from a position away from the front wheel assembly 32 to a position close to the front wheel assembly 32, and the right rear leg 421 rotates forward around the fourth axis D to move the right rear wheel 422 from a position away from the front wheel assembly 32 to a position close to the front wheel assembly 32. When the left rear leg 411 and the right rear leg 421 rotate, the left rear leg 411 and the right rear leg 421 push the linkage mechanism 5 to move, and the linkage mechanism 5 drives the front support frame 2 to rotate upward around the first axis A relative to the support frame 2 and approach the support frame 2, thereby reducing the height of the children's tricycle. After the children's tricycle is folded, it has a small volume and is easy to carry and store. The rotation between the support frame and the front support frame is transmitted through the linkage mechanism, and the structural design is more compact and easier to transmit.

[0045] like Figure 3 As shown, the third axis C is set at an acute angle with the vertical symmetry plane SP, so that when the left rear leg 411 rotates forward around the third axis C, the left rear wheel 412 can move from a position away from the vertical symmetry plane SP to a position close to the vertical symmetry plane SP;

[0046] like Figure 3 As shown, the fourth axis D is set at an acute angle with the vertical symmetry plane SP, so that when the right rear leg 421 rotates forward around the fourth axis D, the right rear wheel 422 can move from a position away from the vertical symmetry plane SP to a position close to the vertical symmetry plane SP.

[0047] The third axis C on the children's tricycle is set at an acute angle with the vertical symmetry plane SP. When the left rear leg 411 rotates forward around the third axis C, the left rear wheel 412 can also move from a position away from the vertical symmetry plane SP to a position close to the symmetry plane position surface SP. At the same time, the fourth axis D and the vertical symmetry plane SP are also set at an acute angle. When the right rear leg 421 rotates forward around the fourth axis D, the right rear wheel 421 can also move from a position away from the vertical symmetry plane SP to a position close to the symmetry plane position surface SP, so that the size of the children's tricycle in the width direction can be reduced, and the volume of the folded children's tricycle is minimized, which is more convenient to carry and store.

[0048] like Figures 1 to 6As shown, the front support frame 2 is rotatably connected with the front end of the support frame 1 around the first axis A through the front rotating seat 21, and the linkage mechanism 5 includes a linkage member 51 arranged in the support frame 1 and capable of moving in the support frame 1, a left driving gear 52 that cooperates with the linkage member 51 to rotate around the third axis C, and a right driving gear 53 that cooperates with the linkage member 51 to rotate around the fourth axis D, the left driving gear 52 is connected to the left rear leg 411 and can rotate around the third axis C together with the upper end of the left rear leg 411, the right driving gear 53 is connected to the right rear leg 421 and can rotate around the fourth axis D together with the upper end of the right rear leg 421, a transmission member 54 is connected to the front rotating seat 21 and deviates from the first axis A, one end of the transmission member 54 is rotatably connected to the front rotating seat 21 around the fifth axis E, and the other end is rotatably connected to the rotating part 513 on the linkage member 51 around the sixth axis F.

[0049] When the children's tricycle is folded, the left rear leg 411 and the left driving gear 52 rotate around the third axis C, and the right rear leg 421 and the right driving gear 53 rotate around the fourth axis D. During this process, the left driving gear 52 and the right driving gear 53 drive the linkage member 51 to rotate. When the linkage member 51 rotates, it drives the transmission member 54 to move, and the transmission member 54 pushes the front rotating seat 21 to rotate around the first axis A and move closer to the support frame 1.

[0050] like Figures 4 to 7 As shown, the linkage member 51 includes a left transmission gear 511 and a right transmission gear 512 disposed in the support frame 1, the left transmission gear 511 meshes with the left drive gear 52 for transmission, the right transmission gear 512 meshes with the right drive gear 53 for transmission, the rotating portion 513 is disposed between the left transmission gear 511 and the right transmission gear 512 and rotates following the left transmission gear 511 and the right transmission gear 512, and the left transmission gear 511, the right transmission gear 512 and the rotating portion 513 rotate around the seventh axis G. The left transmission gear 511 and the right transmission gear 512 are driven by the left drive gear 52 and the right drive gear 53, so that the rotating portion 513 rotates following, and when the rotating portion 513 rotates, it pushes the transmission member 54, so that the front rotating seat 21 rotates around the first axis A and moves closer to the support frame 1.

[0051] like Figures 4 to 7 As shown, the left transmission gear 511, the right transmission gear 512, the left driving gear 52 and the right driving gear 53 are all helical gears.

[0052] like Figures 8 to 10 ,and Fig.18As shown, a locking device is provided between the front support frame 2 and the support frame 1, and the locking device includes a sliding member 61 slidably provided in the support frame, and the front support frame 2 is provided with a first clamping position 211 that can engage with or disengage with the sliding member 61, and the support frame 1 is also provided with a limiting member 62 which engages with the second clamping position 5131 on the rotating part 513 when the sliding member 61 engages with the first clamping position 211, and can be driven by the sliding member 61 to disengage from the second clamping position 5131 when the sliding member 61 disengages from the first clamping position 211.

[0053] like Figures 8 to 10 ,and Fig.18 As shown, the front rotating seat 21 is provided with a first locking position 211, the sliding member 61 includes a sliding block 611 slidably arranged in the support frame 1 and a connecting block 612 connected to the sliding block 611 and used to drive the limiting member 62 to disengage from the second locking position 5131, the sliding block 611 is provided with a first pull cable 63 for pulling the sliding block 611 to slide and disengage from the first locking position 211, the support frame 1 is also provided with a sliding groove 11 for accommodating the sliding of the sliding block 611, and a reset spring 64 for driving the sliding block 611 to reset is also provided between the sliding block 611 and the inner wall of the sliding groove 11.

[0054] When the children's tricycle is folded, the locking device needs to be unlocked, and the first cable 63 is pulled. The first cable 63 pulls the sliding block 611 to slide, so that the sliding block 611 slides out of the first clamping position 211, and when the sliding block 611 slides, the sliding block 611 pushes the connecting block 612 to move. When the connecting block 612 moves, it pushes the limiting member 62 to disengage from the second clamping position 5131, so that the rotating part 513 can rotate relative to the support frame 1, and then pushes the transmission member 54 to move, so that the front rotating seat 21 rotates relative to the support frame 1 and folds. When the tricycle is in the unfolded state, the limiting member 62 is engaged with the second clamping position 5131, and the left rear leg 411 will not shake due to the meshing gap between the left transmission gear 511 and the left drive gear 52, and the right rear leg 421 will not shake due to the meshing gap between the right transmission gear 512 and the right drive gear 53.

[0055] As Figures 8 to 10 As shown, the connecting block 612 is provided with a strip hole 6121, and the limiting member 62 includes a limiting block 621 which is rotatably connected to the support frame 1 and abuts against the second clamping position 5131. The limiting block 621 is provided with a latch 622 which can extend into the movable hole 6121 and can move in the strip hole 6121. When the connecting block 612 slides relative to the support frame 1, the inner wall of the strip hole 6121 presses the latch 622 to drive the limiting block 621 to disengage from the second clamping position 5131.

[0056] When the children's tricycle is folded, the connecting block 612 slides backward, and the inner wall of the bar hole 6121 in the connecting block 612 presses the pin 622, so that the limit block 621 rotates and disengages from the second clamping position 5131. At this time, the rotating part 513 can rotate relative to the support frame 1. During the unfolding of the children's tricycle, the connecting block 612 slides forward, and the inner wall of the bar hole 6121 on the connecting block 612 presses the pin 622, so that the limit block 621 rotates in the opposite direction and engages with the second clamping position 5131. At this time, the rotating part 513 cannot rotate relative to the support frame 1, so that the rear support frame 4 will not shake due to the meshing gap.

[0057] like Fig.14 As shown, the support frame 1 is also rotatably connected with an unlocking assembly 7 capable of unlocking the locking device, and the unlocking assembly 7 includes a handle 71 rotatably connected to the support frame 1 and capable of pulling the first cable 63 when rotating relative to the support frame 1 to disengage the sliding block 621 from the first clamping position 211, and the handle 71 is also provided with a reset element 72 capable of driving the handle 71 to rotate relative to the support frame 1 and reset. The reset element 72 is a torsion spring, and when the children's tricycle is displayed, the handle 71 can be reset by the torsion spring.

[0058] like Fig.14 As shown, the support frame 1 is provided with a receiving groove 11, and a concave hole 12 communicating with the receiving groove 11 is also provided on one side of the support frame 1 adjacent to the receiving groove 11, and a pressing block 13 that can slide therein is provided in the concave hole 12, and the handle 71 is received in the receiving groove 11 and can be pulled up only when the pressing block 13 is pressed, and an elastic reset member 14 for driving the pressing block 13 to reset is also provided between the bottom surface of the concave hole 12 and the pressing block 13.

[0059] When the locking device of the children's tricycle is unlocked, the pressing block 13 is first pressed, and the pressing block 13 extends into the recessed hole 12. At this time, the outer wall of the handle 71 can be exposed. The user pulls the handle 71 and lifts the tricycle. The handle 71 pulls the first cable 63 to move. The first cable 63 pulls the sliding member 61 so that the sliding member 61 is disengaged from the first clamping position 211. At this time, the front rotating seat 21 and the support frame 1 are unlocked. The sliding member 61 slides and drives the limiting member 62 to disengage from the second clamping position 5131. At this time, the support frame 1 and the rotating part 513, so that the locking device is unlocked. When the locking device is unlocked, the left support part 41 and the right support part 42 rotate downward under the action of their own weight and approach the front wheel assembly 32. The left support part 41 and the right support part 42 push the linkage mechanism 5 while rotating. The linkage mechanism 5 drives the front support frame 2 to rotate upward and approach the support frame 1. Therefore, only by pulling and lifting the handle 71 can the locking device be unlocked and the entire children's tricycle be folded. The unlocking is simple and the folding is simple. Moreover, the handle 71 can be pulled up only after the pressing block 13 is pressed, so that the children's tricycle has a two-way locking mechanism, which can protect the handle 71 and avoid accidentally touching the handle 71 and causing the children's tricycle to fold.

[0060] like Figure 12 to Figure 14 As shown, the support frame 1 may also be connected with a hand push rod assembly 8, the support frame 1 is provided with a receiving space 15, the hand push rod assembly 8 includes a rotating seat 81 disposed in the receiving space 15 and rotatable in the receiving space 15, the rotating seat 81 is detachably connected with a push rod 82, the push rod 82 is provided with an elastic fixing member 821 capable of fixing the push rod 82 on the rotating seat 81, the elastic fixing member 821 is provided with a first arc-shaped protrusion 8211, the rotating seat 81 is provided with a clamping hole 811 capable of accommodating the first arc-shaped protrusion 8211, and the elastic fixing member 821 is also provided with a second arc-shaped protrusion 8212 capable of disengaging the first arc-shaped protrusion 8211 from the clamping hole 811 after being pressed. The elastic fixing member 821 is a metal spring.

[0061] A push rod 82 can be added to the children's tricycle, and the user can control the movement of the children's tricycle through the push rod 82. When the push rod 82 is not needed, the first arc-shaped protrusion 8211 is pressed, and the elastic fixing part 821 moves inward, so that the second arc-shaped protrusion 8212 is disengaged from the locking hole 811. At this time, the push rod 82 can be taken out from the rotating seat 81, and the arc-shaped outer wall of the second arc-shaped protrusion 8212 can be squeezed out from the hole wall of the locking hole 811 when the second arc-shaped protrusion 8112 is flush with the locking hole 811, and it will not get stuck.

[0062] like Figure 12 to Figure 14 As shown, a left cable 83 capable of controlling the rotating frame 31 to rotate leftward when the rotating seat 81 rotates and a right cable 84 capable of controlling the rotating frame 31 to rotate rightward are provided between the rotating seat 81 and the rotating frame 31 .

[0063] When the tricycle for children is in use, the push rod assembly 8 can cooperate with the rotating frame 31 to control the rotation of the front wheel assembly 32, so that adults can push and control the tricycle. When adults push the tricycle, the steering handle 33 and the rotating frame 31 can be separated from each other. At this time, the child cannot control the direction of travel by the steering handle 33, while the adult can control the rotation of the steering frame 31 by rotating the push rod 82, thereby controlling the direction.

Claims

1. A children's tricycle having a vertical symmetry plane (SP) and being movable from an unfolded position to a folded position, characterized in that: The invention comprises a support frame (1) for supporting a seat, wherein the front end of the support frame (1) is connected to a front support frame (2) which can rotate relative to the front support frame (2) around a first axis (A), the front support frame (2) is connected to a steering device (3), the steering device (3) comprises a rotating frame (31) which can rotate relative to the front support frame (2) around a second axis (B), the lower end of the rotating frame (31) is provided with a front wheel assembly (32), the upper end of the rotating frame (31) is connected to a steering handlebar (33), the rear end of the support frame (1) is connected to a rear support frame (4), the rear support frame (5) is connected to the rear support frame (6), and the rear support frame (7) is connected to the rear support frame (8). 4) comprising a left support portion (41) and a right support portion (42) arranged on both sides of a symmetry plane (SP), the left support portion (41) being rotatably connected to the support frame (1) around a third axis (C), the left support portion (41) comprising a left rear leg (411) and a left rear wheel (412) arranged at the lower end of the left rear leg (411), the right support portion (42) being rotatably connected to the support frame (1) around a fourth axis (D), the right support portion (42) comprising a right rear leg (421) and a right rear wheel (422) arranged at the lower end of the right rear leg (421); A linkage mechanism (5) is also provided between the front support frame (2) and the rear support frame (4) for driving the front support frame (2) to rotate relative to the support frame (1) around the first axis (A) during the process of the rear support frame (4) rotating relative to the support frame (1); The third axis (C) is arranged at an acute angle with the vertical symmetry plane (SP), so that when the left rear leg (411) rotates forward around the third axis (C), the left rear wheel (412) can move from a position away from the vertical symmetry plane (SP) to a position close to the vertical symmetry plane (SP); The fourth axis (D) is arranged at an acute angle with the vertical symmetry plane (SP), so that when the right rear leg (421) rotates forward around the fourth axis (D), the right rear wheel (422) can move from a position away from the vertical symmetry plane (SP) to a position close to the vertical symmetry plane (SP); The front support frame (2) is connected to the front end of the support frame (1) via a front rotating seat (21) so as to rotate around the first axis (A); the linkage mechanism (5) comprises a linkage member (51) disposed in the support frame (1) and movable in the support frame (1); a left driving gear (52) that cooperates with the linkage member (51) to rotate around a third axis (C); and a right driving gear (53) that cooperates with the linkage member (51) to rotate around a fourth axis (D); the left driving gear (52) is connected to the left rear leg (411). The right driving gear (53) is connected to the right hind leg (421) and can rotate together with the upper end of the left hind leg (411) around a third axis (C); the right driving gear (53) is connected to the right hind leg (421) and can rotate together with the upper end of the right hind leg (421) around a fourth axis (D); a transmission member (54) is connected to the front rotating seat (21) at a position deviating from the first axis (A); one end of the transmission member (54) is rotationally connected to the front rotating seat (21) around a fifth axis (E), and the other end is rotationally connected to the rotating portion (513) on the linkage member (51) around a sixth axis (F); The linkage member (51) comprises a left transmission gear (511) and a right transmission gear (512) which are arranged in the support frame (1); the left transmission gear (511) meshes with the left drive gear (52) for transmission, and the right transmission gear (512) meshes with the right drive gear (53) for transmission; the rotating part (513) is arranged between the left transmission gear (511) and the right transmission gear (512) and rotates following the left transmission gear (511) and the right transmission gear (512); and the left transmission gear (511), the right transmission gear (512) and the rotating part (513) rotate around a seventh axis (G); The left transmission gear (511), the right transmission gear (512), the left driving gear (52) and the right driving gear (53) are all helical gears; The linkage mechanism (5) comprises a rotating part (513) rotatably arranged in the support frame (1) and capable of rotating when the rear support frame (4) rotates relative to the support frame (1); a transmission member (54) is provided between the rotating part (513) and the front rotating seat (21) and capable of driving the front rotating seat (21) to rotate when the rotating part (513) rotates; a locking device is provided between the front support frame (2) and the support frame (1); the locking device comprises a slidable member (54) provided in the support frame The front support frame (2) is provided with a first latching position (211) that can engage with or disengage from the sliding member (61); the support frame (1) is further provided with a limiting member (62) that can engage with a second latching position (5131) on the rotating portion (513) when the sliding member (61) is engaged with the first latching position (211), and can be driven by the sliding member (61) to disengage from the second latching position (5131) when the sliding member (61) is disengaged from the first latching position (211).

2. The children's tricycle according to claim 1, characterized in that: The front rotating seat (21) is provided with the first locking position (211), the sliding member (61) comprises a sliding block (611) slidably arranged in the support frame (1) and a connecting block (612) connected to the sliding block (611) and used for driving the limiting member (62) to disengage from the second locking position (5131), the sliding block (611) is provided with a first pull rope (63) used for pulling the sliding block (611) to slide and disengage from the first locking position (211), and the support frame (1) is also provided with a reset spring (64) for driving the sliding block (611) to reset.

3. The children's tricycle according to claim 2, characterized in that: The connecting block (612) is provided with a strip hole (6121), and the limiting member (62) comprises a limiting block (621) rotatably connected to the support frame (1) and abutting against the second clamping position (5131), and the limiting block (621) is provided with a latch (622) capable of extending into the strip hole (6121) and being movable in the strip hole (6121); when the connecting block (612) slides relative to the support frame (1), the inner wall of the strip hole (6121) presses the latch (622) to drive the limiting block (621) to disengage from the second clamping position (5131).

4. The children's tricycle according to claim 3, characterized in that: The support frame (1) is also rotatably connected to an unlocking component (7) capable of unlocking the locking device, the unlocking component (7) comprising a handle (71) rotatably connected to the support frame (1) and capable of pulling a first cable (63) when rotating relative to the support frame (1) to cause the sliding block (611) to disengage from the first locking position (211), the handle (71) also being provided with a resetting element (72) capable of driving the handle (71) to rotate relative to the support frame (1) and resetting; The support frame (1) is provided with a receiving groove (11), and a concave hole (12) communicating with the receiving groove (11) is also provided on a side of the support frame (1) adjacent to the receiving groove (11). A pressing block (13) capable of sliding therein is provided in the concave hole (12). The handle (71) is received in the receiving groove (11) and can be pulled up only when the pressing block (13) is pressed. An elastic reset member (14) for driving the pressing block (13) to reset is also provided between the bottom surface of the concave hole (12) and the pressing block (13).

5. The children's tricycle according to claim 1, characterized in that: The support frame (1) is also connected to a push rod assembly (8), the support frame (1) is provided with a receiving space (15), the push rod assembly (8) comprises a rotating seat (81) which is arranged in the receiving space (15) and can rotate in the receiving space (15), the rotating seat (81) is detachably connected to a push rod (82), the push rod (82) is provided with an elastic fixing member (821) which can fix the push rod (82) on the rotating seat (81), the elastic fixing member (821) is provided with a first arc-shaped protrusion (8211), the rotating seat (81) is provided with a clamping hole (811) which can accommodate the first arc-shaped protrusion (8211), and the elastic fixing member (821) is also provided with a second arc-shaped protrusion (8212) which can make the first arc-shaped protrusion (8211) disengage from the clamping hole (811) after being pressed.

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