A vehicle

Abstract

This utility model discloses a convertible vehicle, including a pallet frame. Front and rear wheels are connected to the lower side of the pallet frame. The upper side of the pallet frame has a standing area for adults and a seat for children. A rotating rod that can rotate relative to the pallet frame in a vertical plane is also connected to the pallet frame. A connecting frame that can be detachably connected to a pushable device is movably connected to the rotating rod. When the connecting frame is detached from the rotating rod and the rotating rod rotates to an upright position, the vehicle transforms into a child-operated stroller. When the rotating rod rotates to connect with the connecting frame and the connecting frame connects to the pushable device, the vehicle transforms into a trailer for adults to stand on. The pallet frame also has a power unit that connects to the rear or front wheels to provide propulsion. This utility model can be connected to the rear of a pushable device for adults to stand on, for children to ride on, and, more importantly, can be converted into a child-operated stroller.

Description

Technical Field

[0001] This utility model relates to a carrier, belonging to the field of children's products. Background Technology

[0002] In the field of children's products, a trailer is a product that can be attached to the rear of a stroller or other children's vehicle. Its main purpose is to carry two children in suitable situations, with one child riding in the stroller and the other riding on the trailer. For example, Chinese Patent Publication No. (CN205706828U) discloses a novel trailer for children's vehicles, including a footboard, a wheel assembly located at the bottom of the footboard, a pull rod assembly movably connected to the front of the footboard, and a connecting assembly located at the upper end of the pull rod assembly for connecting to the rear frame of the stroller. Although this trailer can carry multiple children when needed, its function is still relatively limited; it can only be attached to the rear of the stroller and can only be used to carry one child.

[0003] Therefore, this utility model was created based on the above-mentioned shortcomings. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technology and provide a simple vehicle. This vehicle can be connected to the rear of a pushable device for adults to stand and ride, or for children to ride. More importantly, it can also be converted into a children's stroller that children can operate independently. It is versatile and suitable for widespread application.

[0005] This utility model is achieved through the following technical solution:

[0006] A transformable vehicle includes a pallet frame with front and rear wheels connected to its lower side. The upper side of the pallet frame has a standing area for adults and a seat for children. A rotating rod is also connected to the pallet frame and can rotate relative to it in a vertical plane. A connecting frame is detachably connected to the rotating rod and can be attached to a pushable device. When the connecting frame is detached from the rotating rod and the rotating rod rotates to an upright position, the vehicle transforms into a child-operated stroller. When the rotating rod rotates to connect with the connecting frame and the connecting frame connects to the pushable device, the vehicle transforms into a trailer for adults to stand on. The pallet frame also has a power unit connected to the rear or front wheels to provide propulsion.

[0007] The rotating rod is also equipped with a handrail that children can grip when the vehicle is used as a stroller.

[0008] The pallet frame is equipped with a bogie that can rotate relative to it. The front wheel is mounted on the bogie. The rotating rod is connected to the bogie and can rotate relative to the bogie in a vertical plane. A positioning mechanism is also provided between the rotating rod and the bogie to lock their relative positions.

[0009] The bogie has a positioning seat at its front end. The positioning mechanism includes multiple first teeth arranged on both sides of the positioning seat along the circumferential direction. The rotating rod includes a rod body. The front end of the rod body is movably connected to a connecting frame. The rear end of the rod body is fixedly connected to a connecting fork capable of elastic deformation. The connecting fork is connected to both sides of the positioning seat. The inner side of the connecting fork is provided with second teeth that can mesh with the first teeth. The positioning mechanism also includes a connecting shaft passing through the connecting fork and the positioning seat. One end of the connecting shaft is fixedly provided with a knob, and the other end of the connecting shaft is provided with a nut that can engage with the nut to lock the connecting fork and the positioning seat.

[0010] The seat includes a seat board, with a front support leg and a rear support leg connected to the underside of the seat board, which can be rotated and unfolded or folded relative to it. The tray frame is provided with a placement position for placing the seat when the front support leg and the rear support leg are rotated and folded relative to the seat board.

[0011] The tray frame is provided with insertion holes for the lower ends of the front and rear support legs to be inserted when the seat is unfolded. Both the front and rear support legs are inverted U-shaped. The seat plate is provided with insertion slots for the folded front and rear support legs to be inserted.

[0012] The power unit includes a battery mounted on a tray frame and a motor powered by the battery and capable of driving the rear or front wheels to rotate. The battery is located between the standing areas and below the seat.

[0013] The connecting frame includes a fixed base. The front end of the rotating rod is detachably connected to the fixed base. A left connecting rod and a right connecting rod are rotatably connected to the fixed base. The front ends of the left and right connecting rods are provided with connectors for connecting them to the pushable equipment. The connectors include a connecting seat connected to the front end of the connecting frame. The connecting seat is provided with a flexible strap that has been injection molded. The strap has teeth. The connecting seat is provided with a channel through which the strap passes when it wraps around and binds the pushable equipment. An operating block that can engage or disengage with the teeth on the strap in the channel is rotatably connected to the connecting seat. A first return spring that can push the operating block back to its original position is also provided between the operating block and the connecting seat.

[0014] The fixed base is provided with a first connecting hole, and the front end of the rotating rod is rotatably connected to a rotating seat. The rotating seat is provided with an upper lug and a lower lug, and the upper lug and the lower lug are provided with a second connecting hole. When the connecting frame is connected to the rotating rod, the fixed base is inserted between the upper lug and the lower lug, and a connecting pin is inserted into the first connecting hole and the second connecting hole, which allows the rotating rod or the connecting frame to rotate around.

[0015] The pallet frame is also equipped with a braking mechanism, which includes a rotating rod rotatably connected to the pallet frame and close to the rear wheel. A brake block is fixedly connected to the rotating rod so as to brake against the rear wheel when it rotates. A pedal is rotatably connected to the pallet frame. An eccentric block is provided on the rotating rod. A transmission rod is provided between the eccentric block and the pedal, which is hinged to both of them and can drive the rotating rod to rotate when the pedal rotates. A second return spring is also provided between the pedal and the pallet frame to push the pedal to return to its original position.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. When the rotating rod of this utility model is detached from the connecting frame, the rotating rod can be erected, allowing the child to sit on the seat on the tray frame. The child can then independently operate the vehicle using the rotating rod, using it as an independent stroller for solo play. When the vehicle needs to be connected to a pushable device such as a stroller, the connecting frame is connected to the pushable device, allowing an adult to stand on the tray frame. The power unit provides forward propulsion, making it easy and fun for adults to push the pushable device. Furthermore, in this state, the adult can also place another child on the seat instead of standing on the tray frame, allowing the vehicle to carry the child. Therefore, this utility model offers versatile functionality, allowing users to select its operating state according to their actual needs.

[0018] 2. The seat of this utility model can be unfolded or folded. When folded, it can be placed in the storage position on the tray frame, making it more convenient for adults to stand. When children need to play alone, the seat can be unfolded and fixed to the tray frame for children's convenience.

[0019] 3. This utility model has a simple structure and can be transformed into multiple forms, bringing convenience to life and making it suitable for widespread application. Attached Figure Description

[0020] Figure 1 This is a perspective view of the utility model;

[0021] Figure 2 This is an exploded view of the present invention;

[0022] Figure 3 This is one of the perspective views of the seat of this utility model;

[0023] Figure 4 This is the second perspective view of the seat of this utility model;

[0024] Figure 5 This is an exploded view of the components of this utility model;

[0025] Figure 6 yes Figure 5 Enlarged view at point A in the middle;

[0026] Figure 7 This is a partial sectional view of the present invention;

[0027] Figure 8 This is a perspective view of a component of this utility model;

[0028] Figure 9 yes Figure 2 Enlarged view at point B;

[0029] Figure 10 This is a perspective view of the present invention as a child vehicle that can be operated by a child;

[0030] Figure 11 This is a side view of the present invention when it is attached to a pushable device as a trailer. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings:

[0032] like Figures 1 to 11 As shown, a transformable vehicle includes a pallet frame 1. A front wheel 2 and a rear wheel 3 are connected to the lower side of the pallet frame 1. The upper side of the pallet frame 1 has a standing area 4 for adults and a seat 5 for children. A rotating rod 6, which can rotate relative to the pallet frame 1 in a vertical plane, is also connected to the rotating rod 6. A connecting frame 7, which can be connected to a pushable device 100, is detachably connected to the rotating rod 6. When the connecting frame 7 is disengaged from the rotating rod 6 and the rotating rod 6 is rotated to an upright position, the vehicle transforms into a child-operated stroller. When the rotating rod 6 is rotated to connect with the connecting frame 7 and the connecting frame 7 is connected to the pushable device 100, the vehicle transforms into a trailer for adults to stand on. The pallet frame 1 also has a power unit 8 connected to the rear wheel 3 or the front wheel 2 to provide propulsion. Figure 10As shown, the rotating rod 6 is detached from the connecting frame 7. When the rotating rod 6 is upright, the child can sit on the seat 5 on the tray frame 1. The child can independently operate the vehicle using the rotating rod 6, using it as an independent stroller for solo play. For ease of operation, the rotating rod 6 is also equipped with a handrail 9 for the child to grip. When the vehicle needs to be connected to a pushable device such as a stroller, the connecting frame 7 is connected to the pushable device 100 (e.g., a child stroller). Figure 11 As shown, adults can stand on the standing area 4 of the pallet frame 1. The power unit 8 provides forward propulsion, making it easy and fun for adults to push the pushable equipment 100. Therefore, this vehicle is versatile, and users can choose its working state according to their actual needs.

[0033] like Figure 1 , Figure 2 , Figure 5 and Figure 10 As shown, the pallet frame 1 is equipped with a bogie 10 that can rotate relative to it. The front wheel 2 is mounted on the bogie 10. The rotating rod 6 is connected to the bogie 10 and can rotate relative to the bogie 10 in a vertical plane. A positioning mechanism 11 is also provided between the rotating rod 6 and the bogie 10 to lock their relative positions. When the rotating rod 6 is upright, its position can be locked by the positioning mechanism 11. When a child is sitting in the seat 5, they can operate the rotating rod 6 through the armrest 9 to make the rotating rod 6 drive the bogie 10 to swing and control the direction. Moreover, the tilt angle of the rotating rod 6 in the vertical plane can be adjusted by the positioning mechanism 11 so that the connecting frame 7 can adapt to different connection positions of the pushable equipment 100, thus making the vehicle have a wide range of applications. For example, if the connection position on the pushable equipment 100 is high, the rotating rod 6 is adjusted to be more tilted; if the connection position on the pushable equipment 100 is low, the rotating rod 6 is adjusted to be flatter. After being adjusted to a suitable position, it is locked by the positioning mechanism 11.

[0034] like Figure 5 and Figure 6As shown, the bogie 10 has a positioning seat 12 at its front end. The positioning mechanism 11 includes a plurality of first teeth 111 arranged on both sides of the positioning seat 12 along the circumferential direction. The rotating rod 6 includes a rod body 61. The front end of the rod body 61 is movably connected to the connecting frame 7. The rear end of the rod body 61 is fixedly connected to a connecting fork 62 that can elastically deform. The connecting fork 62 is connected to both sides of the positioning seat 12. The inner side of the connecting fork 62 is provided with second teeth 112 that can mesh with the first teeth 111. The positioning mechanism 11 also includes a connecting shaft 113 that passes through the connecting fork 62 and the positioning seat 12. One end of the connecting shaft 113 is fixedly provided with a knob 114. The other end of the connecting shaft 113 is provided with a nut (not shown in the figure) that can be threaded to lock the connecting fork 62 and the positioning seat 12. When the nut is loosened, the rotating rod 6 can be rotated to make the connecting fork 62 rotate relative to the connecting seat 12. During the rotation, the connecting fork 62 deforms to a certain extent, which causes the second tooth 112 to be squeezed and disengaged from the first tooth 111 and then re-engaged, constantly changing its position. When it is rotated to the appropriate position, the nut is tightened, thereby locking the connecting fork 62 and the connecting seat 12, ensuring that the second tooth 112 and the first tooth 111 are firmly engaged.

[0035] like Figure 6 As shown, the connecting fork 62 includes a left fork 621 and a right fork 622 connected to the rod 61. The left fork 621 and the right fork 622 can be provided with matching grooves (not shown in the figure) that match the outer surface of the rod 61. When the matching grooves are engaged with the outer surface of the rod 61, the left fork 621 and the right fork 622 can be connected to the rod 61 by connecting structures such as rivets or screws. The left fork 621 and the right fork 622 are joined to form a connecting groove 624 into which the positioning seat 12 can be inserted. Both the left fork 621 and the right fork 622 have protruding protrusions 623 on their inner sides. The second tooth 112 is provided on the protrusion 623 along the circumferential direction. The positioning seat 12 has a recessed groove 121 that matches the protrusion 623. The first tooth 111 is provided at the bottom of the recessed groove 121. When the left fork 621 and the right fork 622 are connected to the positioning seat 12, the protrusion 623 is inserted into the recessed groove 121, so that the first tooth 111 and the second tooth 112 mesh. At the same time, the cooperation between the protrusion 623 and the recessed groove 121 also makes the connecting fork 62 rotate more smoothly relative to the connecting seat 12.

[0036] like Figure 6As shown, the positioning seat 12 has multiple arc-shaped grooves 115 along its circumferential direction on both sides. The left fork 621 and right fork 622 have round protrusions 116 that can engage with the arc-shaped grooves 115, thereby further locking and positioning the rotating fork 62 and the connecting seat 12 to ensure a secure connection. When adjusting the tilt angle of the rotating rod 6, loosening the nut and then forcefully rotating the rotating rod 6 will disengage the round protrusions 116 from the arc-shaped grooves 115 and allow them to enter another arc-shaped groove 115.

[0037] like Figure 3 , Figure 4 and Figure 10 As shown, the seat 5 includes a seat board 51, with a front support leg 52 and a rear support leg 53 connected to the underside of the seat board 51, which can be rotated and unfolded or folded relative to it. The tray frame 1 is provided with a placement position 13 for placing the seat 5 when the front support leg 52 and the rear support leg 53 are rotated and folded relative to the seat board 51. When the vehicle is used as a stroller operated independently by a child, the seat 5 is unfolded for the child to ride in. When the vehicle needs to be connected to the pushable device 100 for an adult to stand in, the seat 5 is folded and placed in the placement position 13. Of course, when the vehicle is connected to the pushable device 100, the seat 5 does not need to be folded. In this case, the adult does not stand on the tray frame 1, but places another child on the seat 5. The adult can then push the pushable device 100 to carry the child using this vehicle.

[0038] like Figure 1 and Figure 2 As shown, the tray frame 1 is provided with insertion holes 14 for the lower ends of the front support leg 52 and the rear support leg 53 to be inserted when the seat 5 is unfolded. In actual operation, the folded seat 5 is taken out from the placement position 13, unfolded, and inserted into the insertion holes 14. The folded seat 5 can be snapped into the placement position 13. Both the front support leg 52 and the rear support leg 53 are inverted U-shaped, and are staggered to prevent collision or interference during folding. The seat plate 51 is provided with insertion slots 54 for the folded front support leg 52 and the rear support leg 53 to be inserted.

[0039] like Figure 1 and Figure 2 As shown, the power unit 8 includes a battery 81 mounted on the tray frame 1 and a motor (not shown) powered by the battery 81 and capable of driving the rear wheel 3 or the front wheel 2. The battery 81 is located between the standing areas 4 and below the seat 5. A reduction mechanism can also be provided between the motor and the rear wheel 3 or the front wheel 2, which can be a transmission mechanism of the prior art, and will not be described in detail here. After the power unit 8 is started, the vehicle can move forward, making it easy for children to play or for adults to use.

[0040] like Figure 1 , Figure 2 and Figure 7 As shown, the connecting frame 7 includes a fixed base 71. The front end of the rotating rod 6 is detachably connected to the fixed base 71. A left connecting rod 72 and a right connecting rod 73 are rotatably connected to the fixed base 71. The front ends of the left connecting rod 72 and the right connecting rod 73 are provided with connecting members 15 for connecting them to the pushable equipment 100. The connecting member 15 includes a connecting seat 151 connected to the front end of the connecting frame 7. The connecting seat 151 is provided with a flexible strap 152 that has been injection molded. The strap 152 has teeth 153. The connecting seat 151 is provided with a channel 154 through which the strap 152 passes when it wraps around and binds the pushable equipment 100. An operating block 155 that can engage or disengage with the teeth 153 on the strap 152 in the channel 154 is rotatably connected to the connecting seat 151. A first return spring 156 that can push the operating block 155 to reset is also provided between the operating block 155 and the connecting seat 151. Pressing the operating block 155 disengages it from the teeth 153, at which point the strap 152 can be tightened or loosened. When the strap is in the appropriate position, the operating block 155 is released, and the first return spring 152 returns to its original position, so that the operating block 155 remains engaged with the teeth, ensuring a secure binding.

[0041] like Figure 2 and Figure 9 As shown, the fixed base 71 is provided with a first connecting hole 161, and the front end of the rotating rod 6 is rotatably connected to a rotating seat 65. The rotating seat 65 is provided with an upper lug 63 and a lower lug 64, and the upper lug 63 and the lower lug 64 are provided with a second connecting hole 162. When the connecting frame 7 is connected to the rotating rod 6, the fixed base 71 is inserted between the upper lug 63 and the lower lug 64, and a connecting pin 163 is inserted in the first connecting hole 161 and the second connecting hole 162, allowing the rotating rod 6 or the connecting frame 7 to rotate around it. When an adult stands on the standing area 4 of the pallet frame 1, the power unit 8 drives the vehicle forward. The adult can hold the push handle 101 of the pushable equipment 100 and control the direction through the push handle 101. When the pushable equipment 100 turns, the connecting frame 7 and the rotating rod 6 rotate relative to each other at the position of the connecting pin 163, so that the vehicle follows the turn of the pushable equipment 100.

[0042] like Figure 5 and Figure 8As shown, the pallet frame 1 is also equipped with a braking mechanism. The braking mechanism includes a rotating rod 171 rotatably connected to the pallet frame 1 and close to the rear wheel 3. A brake block 172 is fixedly connected to the rotating rod 171, which can abut against the rear wheel 3 and brake when it rotates. A pedal 173 is rotatably connected to the pallet frame 1. An eccentric block 174 is provided on the rotating rod 171. A transmission rod 175 is provided between the eccentric block 174 and the pedal 173, which is hinged to both and can drive the rotating rod 171 to rotate when the pedal 173 rotates. A second return spring (not shown in the figure) is also provided between the pedal 173 and the pallet frame 1, which can push the pedal 173 to return to its original position. By stepping on the pedal 173, the pedal 173 rotates. During the rotation, the transmission rod 175 pushes the rotating rod 171 to rotate. The brake block 172 swings with the rotating rod 171, and the brake block 172 abuts against the rear wheel 3 to achieve braking. The power unit 8 in this embodiment is also equipped with an electronic brake. Therefore, when this vehicle is in use, it can be braked by electronic braking or by mechanical braking by stepping on the pedal 171.

[0043] In this embodiment, the pushable equipment 100 is a stroller, but it can also be a wheelchair, tricycle, or suitcase, or other pushable equipment. This vehicle can be operated and played with independently by children, and can also be used for adults to stand while pushing the pushable equipment, thus saving effort. It can also be used to carry children, making it versatile and suitable for widespread application.

[0044] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A carrier, characterized by: The vehicle includes a pallet frame (1), with a front wheel (2) and a rear wheel (3) connected to the lower side of the pallet frame (1). The upper side of the pallet frame (1) is provided with a standing area (4) for adults to stand and a seat (5) for children to sit on. The pallet frame (1) is also connected with a rotating rod (6) that can rotate relative to it in the vertical plane. The rotating rod (6) is detachably connected to a connecting frame (7) that can be connected to a pushable device (100). When the connecting frame (7) is disengaged from the rotating rod (6) and the rotating rod (6) is rotated to the upright position, the vehicle is transformed into a children's car that can be operated by children. When the rotating rod (6) is rotated to connect with the connecting frame (7) and the connecting frame (7) is connected to the pushable device (100), the vehicle is transformed into a trailer that can be stood on by adults. The pallet frame (1) is also provided with a power unit (8) that is connected to the rear wheel (3) or the front wheel (2) to provide propulsion power.

2. The vehicle of claim 1, wherein: The rotating rod (6) is also provided with a handrail (9) that children can hold when the vehicle is used as a stroller.

3. The vehicle of claim 1, wherein: The pallet frame (1) is provided with a bogie (10) that can rotate relative to it. The front wheel (2) is provided on the bogie (10). The rotating rod (6) is connected to the bogie (10) and can rotate relative to the bogie (10) in the vertical plane. A positioning mechanism (11) that can lock the relative position of the rotating rod (6) and the bogie (10) is also provided.

4. The carrier of claim 3, wherein: The bogie (10) is provided with a positioning seat (12) at the front end. The positioning mechanism (11) includes a plurality of first teeth (111) arranged on both sides of the positioning seat (12) along the circumferential direction. The rotating rod (6) includes a rod body (61). The front end of the rod body (61) is movably connected to the connecting frame (7). The rear end of the rod body (61) is fixedly connected to a connecting fork (62) that can elastically deform. The connecting fork (62) is connected to both sides of the positioning seat (12). The inner side of the connecting fork (62) is provided with a second tooth (112) that can mesh with the first teeth (111). The positioning mechanism (11) also includes a connecting shaft (113) that passes through the connecting fork (62) and the positioning seat (12). One end of the connecting shaft (113) is fixedly provided with a knob (114). The other end of the connecting shaft (113) is provided with a nut that can be threaded to lock the connecting fork (62) and the positioning seat (12).

5. The carrier of claim 1, wherein: The seat (5) includes a seat board (51), and the lower side of the seat board (51) is connected to a front support leg (52) and a rear support leg (53) that can be rotated and unfolded or folded relative to it. The tray frame (1) is provided with a placement position (13) for placing the seat (5) when the front support leg (52) and the rear support leg (53) are rotated and folded relative to the seat board (51).

6. The vehicle according to claim 5, characterized in that: The tray frame (1) is provided with insertion holes (14) for inserting the lower ends of the front support leg (52) and the rear support leg (53) when the seat (5) is unfolded. The front support leg (52) and the rear support leg (53) are both inverted U-shaped. The seat plate (51) is provided with insertion slots (54) for inserting the folded front support leg (52) and the rear support leg (53).

7. The vehicle of claim 1, wherein: The power unit (8) includes a battery (81) mounted on a tray frame (1) and a motor powered by the battery (81) and capable of driving the rear wheel (3) or the front wheel (2) to rotate. The battery (81) is located between the standing areas (4) and below the seat (5).

8. The vehicle of claim 1, wherein: The connecting frame (7) includes a fixed base (71), the front end of the rotating rod (6) is detachably connected to the fixed base (71), a left connecting rod (72) and a right connecting rod (73) are rotatably connected to the fixed base (71), the front ends of the left connecting rod (72) and the right connecting rod (73) are provided with connectors (15) for connecting them to the pushable equipment (100), the connectors (15) include a connecting seat (151) connected to the front end of the connecting frame (7), and the connecting seat (151) is provided with a flexible strap (152) formed by injection molding. The strap (152) is provided with teeth (153), and the connecting seat (151) is provided with a channel (154) through which the strap (152) passes when the strap (152) is wrapped around the pushable equipment (100). The connecting seat (151) is rotatably connected with an operating block (155) that can engage or disengage with the teeth (153) on the strap (152) in the channel (154). A first return spring (156) that can push the operating block (155) to reset is also provided between the operating block (155) and the connecting seat (151).

9. The carrier of claim 8, wherein: The fixed base (71) is provided with a first connecting hole (161), and the front end of the rotating rod (6) is rotatably connected to a rotating seat (65). The rotating seat (65) is provided with an upper lug (63) and a lower lug (64). The upper lug (63) and the lower lug (64) are provided with a second connecting hole (162). When the connecting frame (7) is connected to the rotating rod (6), the fixed base (71) is inserted between the upper lug (63) and the lower lug (64), and a connecting pin (163) is inserted in the first connecting hole (161) and the second connecting hole (162) so that the rotating rod (6) or the connecting frame (7) can rotate around it.

10. The vehicle of claim 1, wherein: The pallet frame (1) is also provided with a braking mechanism, which includes a rotating rod (171) rotatably connected to the pallet frame (1) and close to the rear wheel (3). A brake block (172) is fixedly connected to the rotating rod (171) so that it can abut against the rear wheel (3) and brake when it rotates. A pedal (173) is rotatably connected to the pallet frame (1). An eccentric block (174) is provided on the rotating rod (171). A transmission rod (175) is provided between the eccentric block (174) and the pedal (173) and can drive the rotating rod (171) to rotate when the pedal (173) rotates. A second return spring is also provided between the pedal (173) and the pallet frame (1) so as to push the pedal (173) to return to its original position.

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