Telescopic moving trolley and moving stopping method thereof

Abstract

The invention provides a telescopic moving trolley and a moving stopping method thereof. The telescopic moving trolley comprises a trolley body, lifting trundles and a brake mechanism. The brake mechanism comprises a left front lifting base, a right front lifting base, a left rear lifting base, a right rear lifting base, a cam, a front cam shaft, a rear cam shaft, a gear shaft, a lifting spring supporting foot, a coupler, a large left-hand bevel gear, a small left-hand bevel gear, a large right-hand bevel gear, a small right-hand bevel gear and a pedal shaft. The front cam shaft and the rear cam shaft are connected through the coupler, the pedal shaft is connected with the left gear shaft and the right gear shaft, and through meshing reversing of the large right-handed bevel gear and the small right-handed bevel gear and meshing reversing of the large left-handed bevel gear and the small left-handed bevel gear, the pedal shaft is pedaled once to rotate, and four cams rotate synchronously; the four lifting spring supporting feet are driven to descend and make contact with the ground to generate the braking effect, the pedal shaft is slightly hooked through the tiptoe to rotate reversely, the four cams rotate reversely synchronously, the lifting spring supporting feet ascend, and braking is relieved.

Description

Technical Field

[0001] The invention belongs to the field of mobile trolleys, in particular to a telescopic mobile trolley and a moving stopping method thereof. Background Art

[0002] A mobile cart generally refers to a small vehicle used to carry and transport items. This type of cart is useful in various occasions, such as warehouses, factories, hospitals, airports, etc. It usually consists of one or two handles and two or four wheels. Users move items by pushing and pulling the handles.

[0003] The brake system of this type of mobile cart is an important component to ensure operational safety and control the movement of the cart. At present, the mobile cart generally uses a cam to control the lifting of the support legs to achieve movement and stop, and adopts perforated pipes or sheet metal telescopic connections. However, the machine is in a tilted state during the pedaling process, and the machine will be lifted as a whole. The multiple pedaling operations are cumbersome, and the length and width can be adjusted in steps, and the bottom of the machine cannot be perfectly wrapped.

[0004] In summary, the present invention provides a retractable movable trolley and a method for stopping the movement thereof to solve the above-mentioned problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A telescopic mobile trolley comprises a trolley body, lifting casters and a brake mechanism.

[0007] A left base and a right base are respectively arranged around the trolley body, and a connecting rod is arranged between the left base and the right base, and the number of the connecting rods is four;

[0008] The brake mechanism is arranged on the left base and the right base, and includes a left front lifting base, a right front lifting base, a left rear lifting base, a right rear lifting base, a cam, a front camshaft, a rear camshaft, a gear shaft, a lifting spring support foot, a coupling, a large left-handed helical gear, a small left-handed helical gear, a large right-handed helical gear, a small right-handed helical gear, and a pedal shaft;

[0009] The number of the cams is four, the number of the front camshafts is two, the number of the rear camshafts is two, the number of the gear shafts is two, the number of the lifting spring legs is four, and the number of the couplings is two;

[0010] A front camshaft and a gear shaft are vertically staggered and arranged on the left front lifting base, and are both rotatably connected with the left front lifting base, a cam and a small right-handed helical gear are arranged on the front camshaft, a large right-handed helical gear is arranged on one gear shaft, and a lifting spring support foot is arranged in a hole below the left front lifting base;

[0011] A front camshaft and a gear shaft are vertically staggered and arranged on the right front lifting base, and are both rotatably connected with the right front lifting base, a cam and a small left-handed helical gear are arranged on the front camshaft, a large left-handed helical gear is arranged on one gear shaft, and a lifting spring support foot is arranged in a hole below the right front lifting base;

[0012] A rear camshaft is arranged on the left rear lifting base and is rotatably connected with the left rear lifting base, a cam is arranged on the rear camshaft, and a lifting spring support foot is arranged in a hole below the left rear lifting base;

[0013] A rear camshaft is arranged on the right rear lifting base and is rotatably connected with the right rear lifting base, a cam is arranged on the rear camshaft, and a lifting spring support foot is arranged in a hole below the right rear lifting base.

[0014] Furthermore, in the present invention, the lifting spring support foot includes a lifting guide column, a bearing, a spring, a base foot, a reset spring, a shoulder bolt, and a lifting base lower cover. The bearing is rotatably connected to the lifting guide column through a connecting piece, the base foot is slidably connected to the lifting guide column through a shoulder bolt, the spring is arranged between the lifting guide column and the base foot, and the reset spring is arranged below the step of the lifting guide column.

[0015] Furthermore, in the present invention, a locking block is installed between the right base and the connecting rod, and the left base and the right base are connected to the connecting rod through the locking block.

[0016] Furthermore, in the present invention, the pedal shaft is hollow, and has transverse grooves and vertical grooves cut at both ends. Three screw countersunk holes and one set screw hole are respectively arranged at both ends of the pedal shaft, and the inner cavities of the screw countersunk holes and the set screw holes are respectively threadedly connected with bolts and a second set screw.

[0017] Furthermore, in the present invention, long keyways are provided on the front camshaft and the rear camshaft, two threaded holes are provided at each end of the coupling, and the inner cavity of the threaded hole is threadedly connected with a first set screw.

[0018] Furthermore, in the present invention, the lifting caster includes a caster bracket, a roller guide sleeve, an adjusting screw, a roller guide rod, a roller and a limit screw, the roller guide sleeve is arranged below the caster bracket, a waist groove is opened on the side of the roller guide sleeve, the roller guide rod is arranged in the roller guide sleeve, the adjusting screw is threadedly connected to the upper end of the roller guide rod, the roller is threadedly connected to the lower end of the roller guide rod, the limit screw is threadedly connected to the side of the roller guide rod, and is located in the waist groove on the side of the roller guide sleeve.

[0019] Furthermore, in the present invention, the left front lifting base, the right front lifting base, the left rear lifting base, and the right rear lifting base are respectively arranged on the left base and the right base, and are at the same height, and the four lifting casters are respectively arranged on the sides of the left front lifting base, the right front lifting base, the left rear lifting base, and the right rear lifting base.

[0020] Furthermore, in the present invention, the two couplings are respectively arranged between the front camshaft and the rear camshaft.

[0021] Furthermore, in the present invention, the pedal shaft is arranged between the two gear shafts.

[0022] Furthermore, in the present invention, the moving stopping method comprises the following steps:

[0023] A. When the pedal shaft rotates, the two gear shafts rotate synchronously, driving the two front camshafts meshing with them to rotate synchronously, and at the same time driving the two rear camshafts connected by two couplings to rotate synchronously. The four cams rotate synchronously, pushing the four lifting spring legs down until they touch the ground to produce a braking effect;

[0024] B. When the pedal shaft reverses, the two gear shafts rotate synchronously, driving the two front camshafts meshing with them to rotate synchronously, and at the same time driving the two rear camshafts connected by two couplings to rotate synchronously. The four cams rotate synchronously, and the four lifting spring legs rise under the action of the return springs, and the brakes are released.

[0025] Beneficial effects: The present invention has the following beneficial effects:

[0026] 1. The present invention connects the front camshaft and the rear camshaft through a coupling, and the pedal shaft connects the left and right gear shafts. Then, through the meshing reversal of the large right-handed helical gear and the small right-handed helical gear, and the meshing reversal of the large left-handed helical gear and the small left-handed helical gear, the pedal shaft is stepped on once to make it rotate, and the four cams rotate synchronously, driving the four lifting spring legs to descend and contact the ground to produce a braking effect. The pedal shaft is lightly hooked with the toes to reverse it, and the four cams reverse synchronously, the lifting spring legs rise, and the brakes are released.

[0027] 2. In the lifting spring support, the bottom foot is slidably connected to the lifting guide column, and a spring is arranged in the middle. The rotation of the cam drives the lifting spring support foot to descend and contact the ground. The spring force is released to generate positive pressure on the ground. Since the total spring force of the four lifting spring supports is less than the gravity of the machine, the machine will not be lifted during the descent of the lifting spring support foot, so that the height of the machine table remains unchanged when the trolley moves and stops. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the overall structure of the brake mechanism of the present invention;

[0030] Figure 3 It is a schematic diagram of the overall structure of the lifting caster and the lifting spring support foot of the present invention;

[0031] Figure 4 It is a schematic diagram of the overall structure of the longitudinal telescopic connection of the present invention;

[0032] Figure 5 It is a schematic diagram of the overall structure of the transverse telescopic connection of the present invention;

[0033] Figure 6 It is a schematic diagram of the overall structure of the front camshaft and the rear camshaft of the present invention;

[0034] Figure 7 It is a schematic diagram of the overall structure of the pedal shaft of the present invention;

[0035] Figure 8 It is a schematic diagram of the overall structure of the roller guide sleeve of the present invention;

[0036] Fig. 9 It is a schematic diagram of the overall structure of the coupling of the present invention.

[0037] In the figure:

[0038] 1. Trolley body; 2. Left base; 3. Right base; 4. Connecting rod; 5. Lifting caster; 6. Lifting spring support foot; 7. Left front lifting base; 8. Right rear lifting base; 9. Left rear lifting base; 10. Right front lifting base; 11. Bearing; 12. Lifting guide column; 13. Spring; 14. Reset spring; 15. Lifting base lower cover; 16. Bottom foot; 17. Shoulder bolt; 18. Adjusting screw; 19. Caster bracket; 20. Roller guide sleeve; 21. Roller guide rod; 22. Roller; 23 , limit screw; 24, coupling; 25, first set screw; 26, large right-hand helical gear; 27, small right-hand helical gear; 28, rear camshaft; 29, front camshaft; 30, gear shaft; 31, second set screw; 32, large left-hand helical gear; 33, small left-hand helical gear; 34, cam; 35, pedal shaft; 36, locking block; 37, long keyway; 38, transverse groove; 39, screw countersunk hole; 40, set screw hole; 41, vertical groove; 42, threaded hole; 43, bolt; 44, waist groove. DETAILED DESCRIPTION

[0039] In order to better understand the technical content of the present invention, specific embodiments are cited and described as follows in conjunction with the accompanying drawings. Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily defined to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the present invention are not limited to any implementation. In addition, some aspects disclosed in the present invention can be used alone, or in any appropriate combination with other aspects disclosed in the present invention.

[0040] Example 1

[0041] like Figure 1-9 FIG. 1 is a first embodiment of the present invention, which provides a telescopic mobile trolley, including a trolley body 1, lifting casters 5 and a brake mechanism.

[0042] A left base 2 and a right base 3 are respectively arranged around the trolley body 1, and a connecting rod 4 is arranged between the left base 2 and the right base 3, and the number of the connecting rods 4 is four;

[0043] The brake mechanism is arranged on the left base 2 and the right base 3, and includes a left front lifting base 7, a right front lifting base 10, a left rear lifting base 9, a right rear lifting base 8, a cam 34, a front camshaft 29, a rear camshaft 28, a gear shaft 30, a lifting spring support foot 6, a coupling 24, a large left-handed helical gear 32, a small left-handed helical gear 33, a large right-handed helical gear 26, a small right-handed helical gear 27, and a pedal shaft 35;

[0044] There are four cams 34, two front camshafts 29, two rear camshafts 28, two gear shafts 30, four lifting spring legs 6, and two couplings 24;

[0045] A front camshaft 29 and a gear shaft 30 are vertically staggered and arranged on the left front lifting base 7, and are both rotatably connected to the left front lifting base 7. A cam 34 and a small right-handed helical gear 27 are arranged on the front camshaft 29, a large right-handed helical gear 26 is arranged on a gear shaft 30, and a lifting spring support foot 6 is arranged in a hole below the left front lifting base 7;

[0046] A front camshaft 29 and a gear shaft 30 are vertically staggered and arranged on the right front lifting base 10, and are both rotatably connected to the right front lifting base 10, a cam 34 and a small left-handed helical gear 33 are arranged on the front camshaft 29, a large left-handed helical gear 32 is arranged on a gear shaft 30, and a lifting spring support foot 6 is arranged in a hole below the right front lifting base 10;

[0047] A rear camshaft 28 is disposed on the left rear lifting base 9 and is rotatably connected to the left rear lifting base 9, a cam 34 is disposed on the rear camshaft 28, and a lifting spring support foot 6 is disposed in a hole below the left rear lifting base 9;

[0048] A rear camshaft is arranged on the right rear lifting base 8 and is rotatably connected with the right rear lifting base 8 , a cam 34 is arranged on the rear camshaft 28 , and a lifting spring support foot 6 is arranged in a hole below the right rear lifting base 8 .

[0049] like Figure 1-9 As shown, a 90-degree torque reversal is achieved through the meshing of the large left-handed bevel gear 32 with the small left-handed bevel gear 33, and the meshing of the large right-handed bevel gear 26 with the small right-handed bevel gear 27. The front camshaft 29 and the rear camshaft 28 are connected through the coupling 24, and the pedal shaft 35 is connected to the left and right gear shafts 30. Then, through the meshing reversal of the large right-handed bevel gear 26 with the small right-handed bevel gear 27, and the meshing reversal of the large left-handed bevel gear 32 with the small left-handed bevel gear 33, the pedal shaft 35 is stepped on once to rotate, and the four cams 34 rotate synchronously, driving the four lifting spring legs 6 to descend and contact the ground to produce a braking effect. The pedal shaft 35 is lightly hooked with the toes to reverse, and the four cams 34 reverse synchronously, the lifting spring legs 6 rise, and the brake is released.

[0050] Example 2

[0051] Reference Figure 3-7 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0052] In this embodiment, the lifting spring support foot 6 includes a lifting guide column 12, a bearing 11, a spring 13, a base foot 16, a reset spring 14, a shoulder bolt 17, and a lifting base lower cover 15. The bearing 11 is rotatably connected to the lifting guide column 12 through a connecting piece, the base foot 16 is slidably connected to the lifting guide column 12 through the shoulder bolt 17, the spring 13 is arranged between the lifting guide column 12 and the base foot 16, and the reset spring 14 is arranged below the step of the lifting guide column 12.

[0053] Locking blocks 36 are installed between the left base 2 , the right base 3 and the connecting rod 4 , and the left base 2 and the right base 3 are connected to the connecting rod 4 through the locking blocks 36 .

[0054] The pedal shaft 35 is hollow and has a transverse groove 38 and a vertical groove 41 at both ends. Three screw countersunk holes 39 and a set screw hole 40 are respectively provided at both ends of the pedal shaft 35. The inner cavities of the screw countersunk holes 39 and the set screw hole 40 are threadedly connected with bolts 43 and the second set screw 31 respectively.

[0055] Long keyways 37 are provided on the front camshaft 29 and the rear camshaft 28 . Two threaded holes 42 are provided at both ends of the coupling 24 . The inner cavities of the threaded holes 42 are threadedly connected with the first set screws 25 .

[0056] like Figure 3-7 As shown, the cam 34 is in contact with the bearing 11. During the rotation, the cam 34 and the lifting spring support foot 6 are in rolling friction. The lifting spring support foot 6 is driven down by the change in the stroke of the cam 34. After the bottom foot 16 contacts the ground, the lifting guide column 12 continues to descend, the elastic force of the spring 13 is released, and the bottom foot 16 generates positive pressure on the ground. The left base 2 and the right base 3 are connected by the profile and the locking block 36, so that the trolley can be infinitely adjusted in length and width. The pedal shaft 35 and the gear shafts 30 at both ends are locked by the bolt 43 and the second fixing screw 31, and the telescopic and torque transmission functions are met at the same time. The front camshaft 29 and the rear camshaft 28 are connected by screwing the first fixing screw 25 on the coupling 24 into the long keyway 37, and the telescopic and torque transmission functions are met at the same time.

[0057] Example 3

[0058] Reference Figure 1-3 , which is the third embodiment of the present invention, and this embodiment is based on the previous two embodiments.

[0059] In this embodiment, the lifting caster 5 includes a caster bracket 19, a roller guide sleeve 20, an adjusting screw 18, a roller guide rod 21, a roller 22 and a limit screw 23. The roller guide sleeve 20 is arranged below the caster bracket 19. A waist groove 44 is opened on the side of the roller guide sleeve 20. The roller guide rod 21 is arranged in the roller guide sleeve 20. The adjusting screw 18 is threadedly connected to the upper end of the roller guide rod 21, the roller 22 is threadedly connected to the lower end of the roller guide rod 21, and the limit screw 23 is threadedly connected to the side of the roller guide rod 21 and is located in the waist groove 44 on the side of the roller guide sleeve 20.

[0060] The left front lifting base 7, the right front lifting base 10, the left rear lifting base 9, and the right rear lifting base 8 are respectively arranged on the left base 2 and the right base 3, and are at the same height. The four lifting casters 5 are respectively arranged on the sides of the left front lifting base 7, the right front lifting base 10, the left rear lifting base 9, and the right rear lifting base 8.

[0061] The two couplings 24 are respectively provided between the front camshaft 29 and the rear camshaft 28 .

[0062] The pedal shaft 35 is provided between the two gear shafts 30 .

[0063] like Figure 1-3As shown, the screw rod 18 is rotated to adjust the roller guide rod 21 to rise / fall, driving the roller 22 to rise / fall. In the lifting spring support foot 6, the base foot 16 is slidably connected to the lifting guide column 12, and a spring 13 is arranged in the middle. The cam 34 rotates to drive the lifting spring support foot 6 to descend and contact the ground. The elastic force of the spring 13 is released, generating positive pressure on the ground. Since the total elastic force of the spring 13 in the four lifting spring supports 6 is less than the gravity of the machine, the machine will not be lifted during the descent of the lifting spring support foot 6, thereby achieving the goal of keeping the machine table height unchanged when the trolley moves and stops.

[0064] During use, when the pedal shaft 35 rotates, the two gear shafts 30 rotate synchronously, driving the two front cam shafts 29 meshing therewith to rotate synchronously, and at the same time driving the two rear cam shafts 28 connected by two couplings 24 to rotate synchronously. The four cams 34 rotate synchronously, pushing the four lifting spring legs 6 down until they contact the ground to produce a braking effect. When the pedal shaft 35 reverses, the two gear shafts 30 rotate synchronously, driving the two front cam shafts 29 meshing therewith to rotate synchronously, and at the same time driving the two rear cam shafts 28 connected by two couplings 24 to rotate synchronously. The four cams 34 rotate synchronously, and the four lifting spring legs 6 rise under the action of the return springs 14, and the brakes are released.

[0065] The standard parts used in this application document can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented through simple programming by technicians in this field, which is common knowledge in the field. This application is mainly used to protect mechanical devices, so this application no longer explains the control method and circuit connection in detail.

[0066] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A telescopic mobile trolley, comprising a trolley body (1), lifting casters (5) and a brake mechanism, characterized in that: A left base (2) and a right base (3) are respectively arranged around the trolley body (1), and a connecting rod (4) is arranged between the left base (2) and the right base (3), and the number of the connecting rods (4) is four; The brake mechanism is arranged on the left base (2) and the right base (3), and comprises a left front lifting base (7), a right front lifting base (10), a left rear lifting base (9), a right rear lifting base (8), a cam (34), a front camshaft (29), a rear camshaft (28), a gear shaft (30), a lifting spring support foot (6), a coupling (24), a large left-handed helical gear (32), a small left-handed helical gear (33), a large right-handed helical gear (26), a small right-handed helical gear (27), and a pedal shaft (35); The number of the cams (34) is four, the number of the front camshafts (29) is two, the number of the rear camshafts (28) is two, the number of the gear shafts (30) is two, the number of the lifting spring legs (6) is four, and the number of the couplings (24) is two; A front camshaft (29) and a gear shaft (30) are vertically staggered and arranged on the left front lifting base (7), and are both rotatably connected to the left front lifting base (7); a cam (34) and a small right-handed helical gear (27) are arranged on the front camshaft (29); a large right-handed helical gear (26) is arranged on one gear shaft (30); and a lifting spring support foot (6) is arranged in a hole below the left front lifting base (7); A front camshaft (29) and a gear shaft (30) are vertically staggered and arranged on the right front lifting base (10), and are both rotatably connected to the right front lifting base (10); a cam (34) and a small left-handed helical gear (33) are arranged on the front camshaft (29); a large left-handed helical gear (32) is arranged on one gear shaft (30); and a lifting spring support foot (6) is arranged in a hole below the right front lifting base (10); A rear camshaft (28) is arranged on the left rear lifting base (9) and is rotatably connected to the left rear lifting base (9); a cam (34) is arranged on the rear camshaft (28); and a lifting spring support foot (6) is arranged in a hole below the left rear lifting base (9); A rear camshaft is arranged on the right rear lifting base (8) and is rotatably connected to the right rear lifting base (8), a cam (34) is arranged on the rear camshaft (28), and a lifting spring support foot (6) is arranged in a hole below the right rear lifting base (8).

2. The telescopic mobile vehicle according to claim 1, characterized in that: The lifting spring support foot (6) comprises a lifting guide column (12), a bearing (11), a spring (13), a base (16), a reset spring (14), a shoulder bolt (17), and a lifting base lower cover (15); the bearing (11) is rotatably connected to the lifting guide column (12) through a connecting piece; the base (16) is slidably connected to the lifting guide column (12) through the shoulder bolt (17); the spring (13) is arranged between the lifting guide column (12) and the base (16); and the reset spring (14) is arranged below the step of the lifting guide column (12).

3. The telescopic mobile vehicle according to claim 1, characterized in that: Locking blocks (36) are installed between the left base (2), the right base (3) and the connecting rod (4), and the left base (2) and the right base (3) are connected to the connecting rod (4) through the locking blocks (36).

4. The telescopic mobile vehicle according to claim 1, characterized in that: The pedal shaft (35) is hollow and has transverse grooves (38) and vertical grooves (41) cut at both ends. Three screw countersunk holes (39) and one set screw hole (40) are respectively arranged at both ends of the pedal shaft (35). The inner cavities of the screw countersunk holes (39) and the set screw hole (40) are respectively threadedly connected with bolts (43) and a second set screw (31).

5. The telescopic mobile vehicle according to claim 1, characterized in that: The front camshaft (29) and the rear camshaft (28) are both provided with a long keyway (37), two threaded holes (42) are respectively provided at both ends of the coupling (24), and the inner cavity of the threaded hole (42) is threadedly connected with a first set screw (25).

6. The telescopic mobile vehicle according to claim 1, characterized in that: The lifting caster (5) comprises a caster bracket (19), a roller guide sleeve (20), an adjusting screw (18), a roller guide rod (21), a roller (22) and a limit screw (23); the roller guide sleeve (20) is arranged below the caster bracket (19); a waist groove (44) is provided on the side of the roller guide sleeve (20); the roller guide rod (21) is arranged in the roller guide sleeve (20); the adjusting screw (18) is threadedly connected to the upper end of the roller guide rod (21); the roller (22) is threadedly connected to the lower end of the roller guide rod (21); the limit screw (23) is threadedly connected to the side of the roller guide rod (21) and is located in the waist groove (44) on the side of the roller guide sleeve (20).

7. The telescopic mobile vehicle according to claim 1, characterized in that: The left front lifting base (7), the right front lifting base (10), the left rear lifting base (9), and the right rear lifting base (8) are respectively arranged on the left base (2) and the right base (3) and are at the same height. The four lifting casters (5) are respectively arranged on the sides of the left front lifting base (7), the right front lifting base (10), the left rear lifting base (9), and the right rear lifting base (8).

8. The telescopic mobile vehicle according to claim 1, characterized in that: The two couplings (24) are respectively arranged between the front camshaft (29) and the rear camshaft (28).

9. The telescopic mobile vehicle according to claim 1, characterized in that: The pedal shaft (35) is arranged between the two gear shafts (30).

10. A method for stopping movement of a retractable mobile vehicle according to any one of claims 1 to 9, Features: The moving stop method is as follows: A. When the pedal shaft (35) rotates, the two gear shafts (30) rotate synchronously, driving the two front cam shafts (29) meshing therewith to rotate synchronously, and at the same time driving the two rear cam shafts (28) connected by two couplings (24) to rotate synchronously, and the four cams (34) rotate synchronously, pushing the four lifting spring legs (6) down until they come into contact with the ground to produce a braking effect; B. When the pedal shaft (35) rotates in the reverse direction, the two gear shafts (30) rotate synchronously, driving the two front cam shafts (29) meshing therewith to rotate synchronously, and at the same time driving the two rear cam shafts (28) connected by two couplings (24) to rotate synchronously, and the four cams (34) rotate synchronously, and the four lifting spring legs (6) rise under the action of the return spring (14), and the brake is released.

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