Pedal stretching and retracting system and electric luggage case

Abstract

The pedal stretching and retracting system comprises a driving element, a transmission piece and a pedal piece, and the output end of the driving element is connected with the transmission piece; the pedal piece is installed on the outer side of the transmission piece, an elastic transmission structure is installed on the pedal piece, and the pedal piece is in transmission fit with the transmission piece through the elastic transmission structure. The driving element drives the pedal part to stretch and retract through the transmission part, and when the driving element cannot operate, the pedal part is independently retracted relative to the transmission part. The elastic transmission structure can complete traditional transmission operation actions and can slip relative to the transmission part after the pedal part operates to the final position, rigid impact on the final position is avoided, and when the electric quantity is insufficient, the pedal part is retracted inwards by acting on the pedal part from outside to inside, so that the electric energy is saved. The elastic transmission structure is elastically deformed relative to the transmission part, so that the pedal is independently folded inwards in the length direction of the screw, and the problem that a traditional electric telescopic pedal cannot be folded inwards when the electric quantity is insufficient is effectively solved.

Description

Technical Field

[0001] The present invention belongs to the field of electric luggage cases, and in particular relates to a pedal extension and retraction system and an electric luggage case. Background Art

[0002] Existing electric luggage cases have passenger-carrying functions and are generally equipped with footrests for storing the footrests while the user is riding. Existing footrests are categorized as fixed or hidden. Fixed footrests are exposed when not in the riding position, making them prone to collisions with pedestrians and aesthetically pleasing, resulting in a poor user experience. Hidden footrests are mostly hidden in the side bottom of the luggage case and are available in manual or automatic configurations. Manual operation requires the user to actively deploy the footrests, which is cumbersome. For example, the footrest luggage case proposed in CN221082964U utilizes a screw drive mechanism to retract the footrests under the action of a motor. However, in actual use, the luggage case may run low on power, causing the motor to lose power. Since the footrest and screw utilize a threaded fit, there is a self-locking problem, preventing the footrest from retracting, resulting in a temporary fixed structure and the aforementioned problems with the fixed structure. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: how to solve the problem that the electric step of the existing electric luggage box cannot complete the retraction action when the power is insufficient, which makes it easy to collide with pedestrians or structures during movement.

[0004] In order to solve the above technical problems, the inventors have come up with the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0005] A pedal extension and retraction system, comprising:

[0006] A driving element and a transmission element, wherein the output end of the driving element is connected to the transmission element;

[0007] The pedal member is installed on the outside of the transmission member, and an elastic transmission structure is installed on the pedal member. The pedal member forms a transmission fit with the transmission member through the elastic transmission structure;

[0008] The driving element drives the pedal element to extend and retract through the transmission element;

[0009] When the driving element is not working, the pedal member is retracted independently relative to the transmission member.

[0010] In a certain optimized technical solution, the pedal member is provided with a mounting blind hole, the mounting blind hole is for the transmission member to extend into, and mounting grooves are respectively provided on both sides of the mounting blind hole, and the mounting grooves are communicated with the mounting blind hole;

[0011] The elastic transmission structure is installed in the installation groove and includes a transmission body, an elastic support body and a push piece from the inside to the outside. The transmission body is engaged with the outside of the transmission piece.

[0012] When the pedal member is retracted alone, the transmission body reciprocates and presses the elastic supporting body.

[0013] In a certain optimized technical solution, the transmission body is a steel ball and the elastic support body is a spring.

[0014] In a certain optimized technical solution, a spherical structure is provided on one end of the transmission body facing away from the elastic support body;

[0015] The pedal assembly includes an inner pedal and an outer pedal. The inner pedal is slidably fitted on the inner side of the outer pedal. An extension rod is provided on the inner side of the outer pedal. An insertion opening is provided on the inner pedal. The insertion opening is communicated with the mounting groove. The end of the extension rod extends into the insertion opening.

[0016] The outer pedal is forced to move inwards and acts on the transmission body through the extension rod, so that the transmission body and the transmission member are released from the transmission cooperation.

[0017] In a certain optimized technical solution, a pressure-bearing structure is provided on the transmission body, and a pressure-applying structure is provided at the end of the extension rod. The pressure-bearing structure acts on the pressure-applying structure to force the transmission body to separate from the transmission member and compress the elastic support body.

[0018] In a certain optimized technical solution, the elastic transmission structure and the mounting groove are provided in two groups, one on each side of the transmission member;

[0019] Two groups of transmission parts and pedal parts are provided and are respectively located on both sides of the driving element.

[0020] In a certain optimized technical solution, the system further includes a mounting frame, on which a center frame and guide frames distributed on both sides of the center frame are provided. The driving element is installed in the center frame, and the pedal member is slidably fitted in the guide frame.

[0021] In a certain optimized technical solution, a restraining member is provided on the top of the pedal member, and a guide groove is provided on the guide frame, and the restraining member and the guide groove are positioned correspondingly and adapted to each other;

[0022] The side of the guide frame is provided with an assembly hole, which is used to assemble the elastic transmission structure.

[0023] In a certain optimized technical solution, a connecting portion is provided at the bottom of the mounting frame.

[0024] An electric luggage box comprises a box structure and a pedal extension and retraction system installed at the bottom of the box structure.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention adopts an elastic transmission structure between the pedal member and the transmission member. The elastic transmission structure can not only complete the traditional transmission operation action, but also can prevent the elastic transmission structure from slipping relative to the transmission member after the pedal member reaches the end position, thereby avoiding rigid impact at the end position. When the power is insufficient, the pedal member is retracted from the outside to the inside. When retracting, the elastic transmission structure is elastically deformed relative to the transmission member, and reciprocates and jumps along the spiral groove on the surface of the transmission member until it is retracted to the expected position, thereby effectively solving the problem that the traditional electric telescopic pedal cannot be retracted when the power is insufficient.

[0027] Figure 1 A top view of the pedal extension and retraction system of the present invention;

[0028] Figure 2 A side view of the pedal extension and retraction system of the present invention;

[0029] Figure 3 The structure of the pedal part and the transmission part of the present invention is schematically shown. Figure 1 ;

[0030] Figure 4 for Figure 1 Vertical section of Figure 1 ;

[0031] Figure 5 The structure of the pedal part and the transmission part of the present invention is schematically shown. Figure 2 ;

[0032] Figure 6 for Figure 5 Structural diagram of the middle pedal component;

[0033] Figure 7 for Figure 6 A partial enlarged view of point A in the middle;

[0034] Figure 8 for Figure 1 Vertical section of Figure 2 ;

[0035] Figure 9 This is a schematic diagram of the electric trunk structure (pedal retracted);

[0036] Figure 10 This is a schematic diagram of the structure of the electric trunk (with the pedals extended);

[0037] Figure 11 This is a schematic diagram of the overall structure of the electric luggage box;

[0038] Figure 12 、 13 This is a schematic diagram of the internal structure of the electric trunk;

[0039] Figure 14This is a structural relationship diagram of the joystick and steering wheel;

[0040] Figure 15 is the position relationship diagram of the connecting rod;

[0041] Figure 16 This is a structural diagram of the back of the installation box;

[0042] Figure 17 Schematic diagram of the structure of the mounting frame;

[0043] Figure 18 It is a structural diagram of the box structure;

[0044] Figure 19 It is a structural diagram of the side cover body;

[0045] Figure 20 is a schematic diagram of the structure of the skeleton;

[0046] Figure 21 It is a structural diagram of the constraint body;

[0047] Figure 22 Schematic diagram of the structure of the locking body;

[0048] Figure 23 It is the matching structure diagram of the outer casing and the inner casing;

[0049] Figure 24 A top view of the outer casing and the inner casing;

[0050] Figure 25 Schematic diagram of the structure of the sleeve;

[0051] Figure 26 A diagram showing the connection between the connecting rod assembly and the bottom of the joystick.

[0052] In the picture:

[0053] 10. Driving element; 20. Transmission member; 30. Pedal member; 31. Mounting blind hole; 32. Mounting slot; 33. Transmission body; 34. Elastic support body; 35. Pushing member; 301. Inner pedal; 302. Outer pedal; 303. Extension rod; 40. Mounting frame; 41. Connecting part; 50. Center frame; 60. Guide frame; 70. Constraint; 80. Guide slot; 90. Assembly hole; 100. Box structure; 101. Frame; 102. Side cover; 10 3. Inner concave portion 1; 104. Inner concave portion 2; 105. Outer convex portion 1; 106. Outer convex portion 2; 107. Reinforcement member 1; 108. Reinforcement member 1; 109. Mounting box; 110. Steering wheel; 111. Pedal extension and retraction port; 112. Power supply external disassembly port; 120. Power wheel; 130. Joystick; 140. Connecting rod; 150. Constraint body; 160. Locking member; 161. Locking body; 162. Intermediate body; 170. Spring member; 180. Micro switch. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0055] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0056] Example 1

[0057] like Figure 1-3 As shown, a pedal extension and retraction system includes:

[0058] The driving element 10 and the transmission member 20, wherein the output end of the driving element 10 is connected to the transmission member 20;

[0059] The pedal member 30 is mounted on the outside of the transmission member 20. An elastic transmission structure is mounted on the pedal member 30. The pedal member 30 forms a transmission fit with the transmission member 20 through the elastic transmission structure.

[0060] The driving element 10 drives the pedal element 30 to extend and retract via the transmission element 20 . When the driving element 10 is not working, the pedal element 30 retracts independently relative to the transmission element 20 .

[0061] During implementation, the transmission member 20 is driven by the driving element 10 to drive the pedal member 30 to extend and retract, and the elastic transmission structure will form a transmission fit between the pedal body 30 and the transmission member 20. When the power is insufficient, the elastic fit effect of the elastic transmission structure is utilized to retract the pedal member 30 inward alone, and the pedal member 30 can move independently relative to the transmission member 20, and the elastic transmission structure will bounce back and forth relative to the transmission member 20.

[0062] Example 2

[0063] In the embodiment 1, Figure 3 As shown, the pedal member 30 is provided with a mounting blind hole 31, the mounting blind hole 31 is for the transmission member 20 to extend into, and mounting grooves 32 are respectively provided on both sides of the mounting blind hole 31, and the mounting grooves 32 are communicated with the mounting blind hole 31;

[0064] The elastic transmission structure is installed in the installation groove 32, and includes a transmission body 33, an elastic support body 34 and a push piece 35 from the inside to the outside. The transmission body 33 is matched with the outside of the transmission member 20; the position of the push piece 35 in the installation groove 32 is adjusted to complete the adjustment of the pre-tightening force of the steel ball.

[0065] When the pedal member 30 is retracted alone, the transmission body 33 reciprocates and presses the elastic support body 34 .

[0066] The transmission body 33 is a steel ball, and the elastic support body 34 is a spring.

[0067] When the pedal part 30 is retracted alone, it is only necessary to apply pressure inward to overcome the initial force of the elastic support body 34 to keep the steel ball fitted in the spiral groove. The steel ball squeezing the spiral groove will compress the elastic support body 34. Finally, when the pedal part 30 is retracted alone, the steel ball will bounce back and forth relative to the transmission part 20.

[0068] Example 3

[0069] In the embodiment 1, Figures 5 to 8 As shown, the transmission body 33 is provided with a spherical structure at one end facing away from the elastic support body 34;

[0070] The pedal member 30 includes an inner pedal 301 and an outer pedal 302. The inner pedal 301 is slidably fitted on the inner side of the outer pedal 302. An extension rod 303 is provided on the inner side of the outer pedal 302. The inner pedal 301 is provided with an insertion opening, which communicates with the mounting groove 32. The end of the extension rod 303 extends into the insertion opening.

[0071] The outer pedal 302 is forced to move inward and acts on the transmission body 33 through the extension rod 303, so that the transmission body 33 and the transmission member 20 are released from the transmission cooperation.

[0072] The transmission body 33 is provided with a pressure-bearing structure, and the end of the extension rod 303 is provided with a pressure-applying structure. The pressure-bearing structure acts on the pressure-applying structure to force the transmission body 33 to separate from the transmission member 20 and compress the elastic support body 34.

[0073] During specific implementation, especially when the pedal member is retracted alone, pressure is applied to the outer pedal 302. After the pressure is applied, the pressure-applying structure will be used to apply pressure to the pressure-bearing structure, forcing the transmission body 33 and the spiral groove to separate. At the same time, the outer pedal 302 and the inner pedal 301 are then ensured to move inward together until they completely enter the interior of the box structure 100, and until they are maintained for a certain period of time. The inner pedal 301 moves inward relative to the outer pedal 302 under the action of the elastic support body 34 on the transmission body 33, and is re-adapted and installed with the spiral groove using the transmission body 33.

[0074] Example 4

[0075] In the embodiment 1, in order to ensure the stable operation of the extension and retraction of the pedal member 30, Figure 3 As shown, the elastic transmission structure and the mounting groove 32 are provided with two groups, which are respectively located on both sides of the transmission member 20;

[0076] The transmission member 20 and the pedal member 30 are provided in two groups and are respectively located on both sides of the driving element 10. In order to ensure the structural stability of the pedal member 30 and to have a set bearing capacity, the pedal member 30 has an extended length of 6-10 cm and an internal length of 3-5 cm.

[0077] Example 5

[0078] In the embodiment 1, Figure 1 、 2 As shown in FIG. 17 , in order to ensure the bearing capacity of the pedal member 30 and the stability of the extension and retraction action, the following improvements are made:

[0079] The system further includes a mounting frame 40 , on which a center frame 50 and guide frames 60 distributed on both sides of the center frame 50 are provided. The driving element 10 is mounted in the center frame 50 , and the pedal member 30 is slidably fitted in the guide frames 60 .

[0080] A restraining member 70 is provided on the top of the pedal member 30, and a guide groove 80 is provided on the guide frame 60. The restraining member 70 and the guide groove 80 correspond to each other and are adapted to each other. The restraining member 70 is used to restrain the extension length of the pedal member 30;

[0081] The side of the guide frame 60 is provided with an assembly hole 90 , which is used to assemble the elastic transmission structure.

[0082] The bottom of the mounting frame 40 is provided with a connecting portion 41 , which is fixed to the inner bottom of the box structure 100 .

[0083] Example 6

[0084] like Figure 9-16 As shown in Figures 18-20, an electric luggage box includes a box structure 100 and a pedal extension and retraction system installed at the bottom of the box structure 100 and as described in one of the above embodiments.

[0085] The box structure 100 includes a frame body 101 and side covers 102 distributed on both sides of the frame body 101. The side covers 102 are provided with an opening and closing structure, such as a zipper opening and closing method. The bottom of the frame body 101 is provided with an inner recess 103 and an inner recess 104. The bottom of the side covers 102 is provided with an outer protrusion 105 and an outer protrusion 106, a pedal extension port 111 and a power supply external disassembly port 112. The power supply external disassembly port 112 is used to disassemble and assemble the power supply from the outside, avoiding the problem of having to open the box for disassembly and assembly during airport security checks.

[0086] In order to realize the hidden installation of the power wheel 120 and the steering wheel 110, the space at the bottom is fully utilized: the outer convex part 105 and the inner concave part 103 correspond to each other and are used to install the steering wheel 110, the top of the outer convex part 105 is provided with a through opening, the outer convex part 2 106 and the inner concave part 2 104 are used to install the power wheel 120, and the side of the outer convex part 2 106 is provided with a through opening 2.

[0087] Reinforcement piece 1 107 and reinforcement piece 2 108 are installed at the bottom corners on the inner side of the frame body 101. Reinforcement piece 107 is connected to the steering wheel 110, and reinforcement piece 2 108 is connected to the power wheel 120. The pedal extension and retraction system, power supply and control module are installed in the box structure 100 between reinforcement piece 107 and reinforcement piece 2 108.

[0088] A connecting rod assembly is mounted on the reinforcement 107 for horizontal rotation. The bottom of the control rod 130 is connected to the steering wheel through the connecting rod assembly. The control rod 130 is installed on the front side of the box body. Figure 26 As shown, the bottom and connecting rod assembly deflect slightly forward and backward.

[0089] A mounting box 109 is provided on the top front side of the frame body 101 . The mounting box 109 is provided with an assembly opening (waist-shaped holes arranged front and back), and a control rod 130 is installed in the assembly opening.

[0090] One way: such as Figure 25 As shown, a sleeve is axially mounted on the outer side of the control rod 130, and an outer edge body (with an elastic pad at the bottom) is provided on the top of the sleeve and is distributed above the assembly port, and a limiting screw is provided on the side and is distributed at the bottom of the assembly port to constrain the sleeve from moving up and down. The sleeve can rotate or not rotate relative to the control rod 130, and can be set according to actual needs, and the constraint body can constrain the sleeve.

[0091] Another way: In the actual implementation, the push-pull mode often encounters fast operation, but when turning, it will cause the center of gravity to deviate sideways: such as Figure 23-24 As shown, the outer side of the control rod 30 is axially slidably fitted with an inner sleeve 301, and the outer side of the inner sleeve 301 is rotatably mounted with an outer sleeve 302. The inner sleeve 301 deflects forward and backward relative to the outer sleeve 302, and the outer sleeve 302 slides forward and backward in the assembly opening. The bottom of the control rod 130 passes through the assembly opening and is connected to the steering wheel 110 via the connecting rod 140. The bottom of the control rod 130 is provided with a hinge node (not released) for forward and backward deflection, which is suitable for slight forward and backward deflection relative to the connecting rod 140. The restraining body can be used to restrain the outer sleeve.

[0092] The bottom of the mounting box 109 is provided with a restraining body 150, a locking member 160, a micro switch 180, a micro switch 2 190, and a Hall effect electromagnetic rocker 200. The restraining body 150 is provided in two groups, respectively distributed on the front and rear sides of the control rod 130. One end of the restraining body 150 is rotatably mounted on the bottom of the mounting box 109, and the other end is connected via a spring member 170. The rotation nodes of the spring member 170 and the restraining body 150 are respectively located on the front and rear sides of the control rod 130. The locking member 160 is slidably fitted on the mounting box 109 to compress and lock the end of the restraining body 150.

[0093] like Figure 21-22 As shown, the constraint body 150 includes a first constraint body and a second constraint body. The free ends of the first constraint body and the second constraint body are provided with an opening and closing body. The opening and closing body gradually deviates downward along the side away from the control rod 130. The opening and closing body is distributed between the Hall electromagnetic rocker 200 and the second micro switch 190. The locking member 160 is provided with a locking body 161 distributed on the outside of the two opening and closing bodies and an intermediate body 162 distributed between the two opening and closing bodies.

[0094] The locking member 160 is exposed from the bottom of the installation box 109 to adjust the position of the locking member 160.

[0095] When the locking part 160 is moved to the side away from the control rod 130, the locking body 161 of the locking part 160 and the opening and closing body are staggered in the upper and lower positions, and the intermediate body 162 enters between the opening and closing bodies and extends them a certain distance. At this time, the circumferential constraint of the control rod 130 is released, and the micro switch 180 is triggered by the locking part 160. The electric suitcase is in riding mode and the pedals are automatically extended. At this time, the intermediate body 161 is clamped between the two opening and closing bodies to ensure that there will be no accidental disconnection during riding. The Hall electromagnetic rocker 200 is pushed forward by pushing the opening and closing body of the constraint body 1 forward (the maximum forward push amount is 4mm), and the box moves forward. When the control force is released, it will automatically return to its position and automatically slow down. When encountering an emergency, the control rod 130 can be pulled back instinctively to brake (the maximum backward pull amount is 2mm).

[0096] The locking part 160 is moved toward the side close to the control rod 130, and the intermediate body 162 of the locking part 160 is moved out from between the opening and closing bodies. The locking body 161 is aligned with the upper and lower positions of the opening and closing bodies again and is locked, so that the control rod 130 is constrained from rotating. That is, at this time, the micro switch 180 is released by the locking part 160 to disconnect the power supply, the pedal is automatically retracted, and the electric suitcase is in the push-pull mode. The circumferential constraint is used to prevent the control rod 130 from tipping over in the push-pull mode, especially when pushing and pulling (turning) quickly. In addition, this structure can avoid routing the wires inside the control rod, so that the wire harness will not be worn out during extension and turning, which is not easy to detect. It is low-cost and easy to operate, and is more friendly to children, the elderly, the disabled and other groups.

[0097] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The replacement may be a replacement of a portion of a structure, device, or method step, or it may be a complete technical solution. Any equivalent replacement or modification based on the technical solution and inventive concept of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A pedal extension and retraction system, characterized in that: include: A driving element (10) and a transmission element (20), wherein an output end of the driving element (10) is connected to the transmission element (20); A pedal member (30), the pedal member (30) is mounted on the outside of the transmission member (20), an elastic transmission structure is mounted on the pedal member (30), and the pedal member (30) forms a transmission fit with the transmission member (20) via the elastic transmission structure; The driving element (10) drives the pedal member (30) to extend and retract via the transmission member (20); When the driving element (10) is not in operation, the pedal member (30) is independently retracted relative to the transmission member (20).

2. A pedal extension and retraction system according to claim 1, characterized in that: The pedal member (30) is provided with a mounting blind hole (31), the mounting blind hole (31) is for the transmission member (20) to extend into, and mounting grooves (32) are respectively provided on both sides of the mounting blind hole (31), and the mounting grooves (32) and the mounting blind hole (31) are communicated with each other; The elastic transmission structure is installed in the installation groove (32) and includes a transmission body (33), an elastic support body (34) and a push member (35) from the inside to the outside. The transmission body (33) is transmission-fitted on the outside of the transmission member (20); When the pedal member (30) is retracted alone, the transmission body (33) reciprocates and presses the elastic support body (34).

3. A pedal extension and retraction system according to claim 2, characterized in that: The transmission body (33) is a steel ball, and the elastic support body (34) is a spring.

4. A pedal extension and retraction system according to claim 2, characterized in that: A spherical structure is provided at one end of the transmission body (33) facing away from the elastic support body (34); The pedal member (30) includes an inner pedal (301) and an outer pedal (302), wherein the inner pedal (301) is slidably fitted on the inner side of the outer pedal (302), an extension rod (303) is provided on the inner side of the outer pedal (302), and an insertion opening is provided on the inner pedal (301), the insertion opening is communicated with the mounting groove (32), and an end of the extension rod (303) extends into the insertion opening; The outer pedal (302) is forced to move inwards and acts on the transmission body (33) through the extension rod (303), so that the transmission body (33) and the transmission member (20) are released from the transmission fit.

5. A pedal extension and retraction system according to claim 4, characterized in that: The transmission body (33) is provided with a pressure-bearing structure, and the end of the extension rod (303) is provided with a pressure-applying structure. The pressure-bearing structure acts on the pressure-applying structure to force the transmission body (33) to separate from the transmission member (20) and compress the elastic support body (34).

6. A pedal extension and retraction system according to claim 2, characterized in that: The elastic transmission structure and the mounting groove (32) are provided in two groups, each located on both sides of the transmission member (20); Two groups of transmission members (20) and pedal members (30) are provided and are respectively located on both sides of the driving element (10).

7. The pedal extension and retraction system according to claim 2, characterized in that: The system further comprises a mounting frame (40), the mounting frame (40) being provided with a central frame (50) and guide frames (60) distributed on both sides of the central frame (50), the driving element (10) being mounted in the central frame (50), and the pedal member (30) being slidably fitted in the guide frames (60).

8. The pedal extension and retraction system according to claim 7, characterized in that: A restraining member (70) is provided on the top of the pedal member (30), and a guide groove (80) is provided on the guide frame (60), wherein the restraining member (70) and the guide groove (80) are positioned correspondingly and fit together. An assembly hole (90) is provided on the side of the guide frame (60), and the assembly hole (90) is used to assemble the elastic transmission structure.

9. The pedal extension and retraction system according to claim 8, characterized in that: A connecting portion (41) is provided at the bottom of the mounting frame (40).

10. An electric luggage box, characterized in that: The invention comprises a box structure (100) and a pedal extension and retraction system according to any one of claims 1 to 8 and installed at the bottom of the box structure (100).

Images