Trundle treading rod braking system

Abstract

The invention discloses a trundle treading rod braking system which comprises a trundle frame, circular plates are arranged at the two ends of the bottom of the trundle frame respectively, a first through hole is formed in the middle of the trundle frame, a bearing is installed in the first through hole, a first cylinder is rotationally arranged on the axis of the bearing, and a second cylinder is rotationally arranged on the axis of the first cylinder. In conclusion, compared with the prior art, the brake device has the beneficial effects that the mode that a brake block is in contact with the surface of a tire is changed into the mode that a brake pad is in contact with a hub, and therefore the brake device is more stable in braking; the wheel hub is not in contact with the ground all the year round and is not easy to wear, so that the friction force between the wheel hub and the brake pad is well ensured, and the trundle can still be braked under the condition of long-term use; and a speed reduction gear is additionally arranged on the gear of the trundle, so that when the vehicle body goes down the abrupt slope, the speed of going down the abrupt slope can be reduced through the speed reduction gear, and the safety is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of casters, and particularly to a caster pedal braking system. Background Art

[0002] Caster is a general term, including swivel casters, fixed casters and swivel casters with brakes. Swivel casters, also known as universal wheels, have a structure that allows for a large degree of rotation; fixed casters, also called directional casters, have no rotating structure and cannot rotate. Usually, these two types of casters are used in combination.

[0003] For example, in Chinese Patent: Application No. 201810287304.9, Patent Name: A Fully Locking Caster, "comprising a locking mechanism, the locking mechanism includes a shift driving rod and a spring sheet; the shift driving rod and the spring sheet are arranged opposite to each other up and down; the shift driving rod includes a shift driving rod body and a locking bar, the shift driving rod body and the locking bar are connected up and down; a plurality of positioning blocks are evenly arranged in a circular array on the locking surface of the spring sheet opposite to the locking bar. When the shift driving rod body moves downward, it drives the locking bar to be embedded between any two adjacent positioning blocks to complete the locking; the cam also has a first contact surface and a second contact surface; when the cam rotates to the first extreme position, the top block is in pressing connection with the first contact surface; when the cam rotates to the second extreme position, the top block is in pressing connection with the second contact surface; further comprising a bracket and a wheel body; the wheel body is rotatably connected to the bracket, the lifting device is connected to the bracket up and down, the shift driving rod body is slidably connected to the bracket, and the spring sheet is fixedly connected to the bracket; the bracket includes a protective cover, a bracket body, a hollow insertion rod and a spring; the protective cover covers the outside of the wheel body, the hollow insertion rod is connected to the bracket body; the driving rod body is slidably connected to the hollow insertion rod, the spring is sleeved on the driving rod body, and both ends are fixedly connected to the hollow insertion rod and the top block respectively". The existing caster braking method is to use a brake block to press down on the tire surface of the wheel from top to bottom to achieve braking through friction. However, this method has defects. The tire surface of the caster will be worn during years of use, and the surface will become smooth and dirty. In this way, the friction between the brake block and the tire surface will become smaller. Over time, it will be difficult for the brake block to completely stop the caster through friction. Moreover, the existing caster only has two gears: free rotation and full braking, lacking a deceleration gear. When the vehicle body goes down a steep slope, accidents may occur due to the inability to decelerate. Summary of the Invention

[0004] The purpose of the present invention is to provide a caster pedal braking system.

[0005] To achieve the above purpose, the present invention adopts the following solutions:

[0006] A caster pedal braking system includes a caster frame. At both ends of the bottom of the caster frame, circular plates are respectively provided. A rotating shaft is rotatably provided between the circular plates. A wheel is provided on the rotating shaft. A first through hole is provided in the middle of the caster frame. A bearing is installed in the first through hole. A first cylinder is rotatably provided on the axis of the bearing. A fixing plate is fixed on the top of the first cylinder:

[0007] A locking mechanism. Fixed cylinders coaxial with the rotating shaft are respectively fixed on the circular plates. A circular ring is fixed at one end of the fixed cylinder. A plurality of cylinders are sequentially provided on the outer wall of the circular ring. A first square hole is provided on the axis of the cylinder. A locking mechanism capable of pressing against the hub is respectively provided on the first square hole;

[0008] A ratchet group, which consists of a ratchet and a driving frame. A ratchet capable of driving the locking mechanism to work is rotatably provided on the fixed cylinder. A driving frame capable of driving the ratchet to rotate is provided on the caster frame;

[0009] A central control component. A second square hole is provided on the axis of the first cylinder. A moving rod is provided in the second square hole. One end of the moving rod is rotatably arranged on the driving frame. A pedal is hinged on one side of the fixing plate. A central control component capable of controlling the caster gear is provided between the pedal and the moving rod;

[0010] A locking direction group. A locking direction group is provided between the caster frame and the first cylinder.

[0011] As a further solution of the present invention, the driving frame includes first guide grooves symmetrically arranged on the caster frame. A rack is movably provided on the first guide groove. A cross plate is fixed between the two racks. One end of the moving rod is rotatably arranged on the cross plate.

[0012] As a further solution of the present invention, the locking mechanism includes a square cylinder arranged in the first square hole. A square rod penetrates through the top of the square cylinder. An arc brake block is fixed on the top of the square rod. A first spring is fixed at the bottom of the square rod. An arc surface capable of cooperating with the ratchet is provided at the bottom of the square cylinder. A limiting plate is provided above the arc surface. A second spring is provided above the limiting plate of the square cylinder.

[0013] As a further solution of the present invention, the ratchet includes a first annular groove arranged on the circular plate and coaxial with the fixed cylinder. A second cylinder is rotatably provided on the first annular groove. A plurality of convex plates are sequentially provided at one end of the second cylinder. A plurality of first clamping grooves capable of cooperating with the arc surface are sequentially arranged from low to high on the top of the convex plate. A plurality of first teeth capable of cooperating with the rack are sequentially arranged on the outer wall of the second cylinder along the circumference.

[0014] As a further solution of the present invention, the locking group includes a gear plate fixed on the cross plate and coaxial with the moving rod, and a plurality of second teeth that can be engaged with the gear plate are sequentially arranged along the circumference at the bottom of the first cylinder.

[0015] As a further solution of the present invention, a groove is provided at the bottom of the first cylinder, and a third spring is sleeved on the moving rod and located in the groove.

[0016] As a further solution of the present invention, the central control component includes second guide grooves symmetrically arranged on the fixed plate on both sides of the moving rod. A triangular plate is movably arranged on the second guide grooves. A plurality of second card slots are sequentially arranged from top to bottom on the hypotenuse of the triangular plate. Trapezoidal blocks are respectively arranged on both sides of the moving rod, and arc-shaped blocks that can cooperate with the second card slots are fixed on the hypotenuses of the trapezoidal blocks. A connecting rod is hinged between the pedal and the triangular plate.

[0017] As a further solution of the present invention, the pedal is composed of a V-shaped frame and a flat plate. The hinge point of the V-shaped frame is located at the corner of the V-shaped frame, and the connecting rod is hinged at one end of the V-shaped frame.

[0018] As a further solution of the present invention, a protective shell is provided at the top of the fixed plate.

[0019] In summary, the beneficial effects of the invention compared with the prior art are as follows: The present invention can change the way of the brake block contacting the tire surface to the way of the brake pad contacting the wheel hub. Because the wheel hub does not contact the ground all year round and will not be easily worn, the friction with the brake pad can be well guaranteed, so that the caster can still be braked after long-term use;

[0020] Moreover, a deceleration gear is added to the gear of the caster. In this way, when the vehicle body goes down a steep slope, the speed of going down the steep slope can be reduced through the deceleration gear, thus ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional view of the present invention.

[0022] Figure 2 is an exploded view of the present invention.

[0023] Figure 3 is a sectional view of the present invention.

[0024] Figure 4 is a sectional view of the first cylinder in the present invention.

[0025] Figure 5 is the present invention Figure 2 is an enlarged view of part A in the present invention.

[0026] Figure 6For the present invention Figure 2 An enlarged view of location B in the present invention

[0027] Description of reference numerals in the drawings: 1, caster bracket; 2, circular plate; 3, rotating shaft; 4, wheel; 5, first through hole; 6, bearing; 7, first cylinder; 8, fixing plate; 20, locking mechanism; 9, fixing cylinder: 10, ring; 11, cylinder; 12, first square hole; 30, ratchet set; 40, ratchet; 50, driving frame; 60, central control component; 13, second square hole; 14, moving rod; 15, pedal; 70, locking direction group; 51, first guide groove; 52, rack: 53, cross plate: 21, square cylinder; 22, square rod; 23, arc brake block; 24, first spring; 25, arc surface: 26, limiting plate; 27, second spring; 41, first annular groove: 42, second cylinder; 43, convex plate; 44, first card slot; 45, first tooth; 71, gear plate; 72, second tooth; 73, groove: 74, third spring; 61, second guide groove; 62, triangular plate; 63, second card slot; 64, trapezoidal block; 65, arc chuck; 66, connecting rod; 81, V-shaped frame; 82, flat plate; 91, protective shell. Detailed implementation manners

[0028] The following specific implementation content provides various different embodiments or examples for implementing the invention. Of course, these are only embodiments or examples and are not intended to be restrictive. Additionally, repeated reference numerals may be used in different embodiments, such as repeated numbers and / or letters. These repetitions are for the purpose of simply and clearly describing the invention and do not represent a specific relationship between the different embodiments and / or structures being discussed.

[0029] Furthermore, spatially relative terms may be used, such as "below", "lower side", "from inside to outside", "above", "upper side" and similar terms. These relational terms are for facilitating the description of the relationship between some elements or features in the drawings and other elements or features. These spatial relational terms include different orientations of the device during use or operation, as well as the orientations described in the drawings. The device may be rotated to different orientations or other azimuths, and the spatially relative adjectives used may be interpreted in the same way accordingly. Therefore, it cannot be understood as a limitation to the invention. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0030] The present invention will be further described below in conjunction with the description of the drawings and the detailed implementation manners: As Figures 1 to 6A caster pedal braking system as shown includes a caster frame 1. At both ends of the bottom of the caster frame 1, round plates 2 are respectively provided. A rotating shaft 3 is rotatably provided between the round plates 2. A wheel 4 is provided on the rotating shaft 3. A first through hole 5 is provided in the middle of the caster frame 1. A bearing 6 is installed in the first through hole 5. A first cylinder 7 is rotatably provided on the axis of the bearing 6. A fixing plate 8 is fixed on the top of the first cylinder 7:

[0031] A locking mechanism 20. Fixed cylinders 9 coaxial with the rotating shaft 3 are respectively fixed on the round plates 2. A ring 10 is fixed at one end of the fixed cylinder 9. A plurality of cylinders 11 are sequentially provided on the outer wall of the ring 10. A first square hole 12 is provided on the axis of the cylinder 11. A locking mechanism 20 capable of pressing against the hub is respectively provided on the first square hole 12;

[0032] A ratchet group 30, which is composed of a ratchet 40 and a driving frame 50. A ratchet 40 capable of driving the locking mechanism 20 to work is rotatably provided on the fixed cylinder 9. A driving frame 50 capable of driving the ratchet 40 to rotate is provided on the caster frame 1;

[0033] A central control component 60. A second square hole 13 is provided on the axis of the first cylinder 7. A moving rod 14 is provided in the second square hole 13. One end of the moving rod 14 is rotatably arranged on the driving frame 50. A pedal 15 is hinged on one side of the fixing plate 8. A central control component 60 capable of controlling the caster gear is provided between the pedal 15 and the moving rod 14;

[0034] A locking direction group 70. A locking direction group 70 is provided between the caster frame 1 and the first cylinder 7.

[0035] A further embodiment of the driving frame 50 in the present invention: The driving frame 50 includes first guide grooves 51 symmetrically arranged on the caster frame 1. A rack 52 is movably arranged on the first guide grooves 51. A cross plate 53 is fixed between the two racks 52. One end of the moving rod 14 is rotatably arranged on the cross plate 53.

[0036] A further embodiment of the locking mechanism 20 in the present invention: The locking mechanism 20 includes a square cylinder 21 arranged in the first square hole 12. A square rod 22 is penetrated through the top of the square cylinder 21. An arc brake block 23 is fixed on the top of the square rod 22. A first spring 24 is fixed at the bottom of the square rod 22. An arc surface 25 capable of cooperating with the ratchet 40 is provided at the bottom of the square cylinder 21. A limiting plate 26 is provided above the arc surface 25. A second spring 27 is provided on the square cylinder 21 above the limiting plate 26.

[0037] A further embodiment of the ratchet 40 in the present invention: The ratchet 40 includes a first annular groove 41 provided on the circular plate 2 and coaxial with the fixed cylinder 9. A second cylinder 42 is rotatably provided on the first annular groove 41. A plurality of convex plates 43 are sequentially provided at one end of the second cylinder 42. A plurality of first card slots 44 that can cooperate with the arc surface 25 are sequentially provided on the tops of the convex plates 43 from low to high. A plurality of first teeth 45 that can cooperate with the rack 52 are sequentially provided on the outer wall of the second cylinder 42 along the circumference.

[0038] A further embodiment of the locking direction group 70 in the present invention: The locking direction group 70 includes a gear plate 71 fixed on the cross plate 53 and coaxial with the moving rod 14. A plurality of second teeth 72 that can mesh with the gear plate 71 are sequentially provided on the bottom of the first cylinder 7 along the circumference.

[0039] A further embodiment of the first cylinder 7 in the present invention: A groove 73 is provided at the bottom of the first cylinder 7. A third spring 74 is sleeved on the moving rod 14 and located in the groove 73.

[0040] A further embodiment of the central control component 60 in the present invention: The central control component 60 includes second guiding grooves 61 symmetrically provided on the fixing plate 8 on both sides of the moving rod 14. A triangular plate 62 is movably provided on the second guiding grooves 61. A plurality of second card slots 63 are sequentially provided on the hypotenuse of the triangular plate 62 from top to bottom. Trapezoidal blocks 64 are respectively provided on both sides of the moving rod 14. Arc-shaped clamping blocks 65 that can cooperate with the second card slots 63 are fixed on the hypotenuses of the trapezoidal blocks 64. A connecting rod 66 is hinged between the pedal 15 and the triangular plate 62.

[0041] A further embodiment of the pedal 15 in the present invention: The pedal 15 is composed of a V-shaped frame 81 and a flat plate 82. The hinge point of the V-shaped frame 81 is located at the corner of the V-shaped frame 81. The connecting rod 66 is hinged at one end of the V-shaped frame 81.

[0042] A further embodiment of the fixing plate 8 in the present invention: A protective shell 91 is provided on the top of the fixing plate 8.

[0043] During use: When the user needs to go down a steep slope and wants to reduce the speed of going down the steep slope through the casters, they only need to step on the pedal once, which causes the connecting rod 66 to pull the triangular plate 62, making the triangular plate 62 move and the trapezoidal block 64 slide. The arc-shaped clamping block 65 will move to the previous second card slot 63, and the moving rod 14 will move upward. In this way, the driving frame 50 can move upward, the rack 52 will drive the first tooth 45 to rotate, the second cylinder 42 will rotate, and then drive the ratchet 40 to rotate. At this time, the arc-shaped surface 25 at the bottom of the square cylinder 21 will cooperate with the previous first card slot 44, so that the square cylinder 21 moves upward. At this time, under the action of the first spring 24, the arc-shaped brake block 23 will fit with the wheel hub, but the arc-shaped brake block 23 will not be locked. The caster is decelerated by the spring force of the first spring 24.

[0044] When the user needs to fully lock the caster, they step on the pedal again, causing the connecting rod 66 to pull the triangular plate 62, making the triangular plate 62 move and the trapezoidal block 64 slide. The arc-shaped clamping block 65 will move to the uppermost second card slot 63, and the driving frame 50 will continue to move upward. As a result, the rack 52 will drive the first tooth 45 to rotate, the second cylinder 42 will rotate, and the arc-shaped surface 25 will cooperate with the uppermost first card slot 44. At this time, because the square cylinder 21 moves upward again, the first spring 24 and the second spring 27 will be compressed to the maximum value. The brake block 23 will be pressed tightly against the wheel hub and cannot move, and the gear plate 71 and the second tooth 72 will mesh, thus fully locking the caster.

[0045] The above shows and describes the basic principles, main features, and advantages of the invention. Those skilled in the art should understand that the invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the invention. Without departing from the spirit and scope of the invention, the invention will have various changes and improvements, and these changes and improvements all fall within the scope of the invention claimed. The scope of the invention claimed is defined by the appended claims and their equivalents.

Claims

1. A caster pedal brake system, comprising a caster frame (1), circular plates (2) are respectively provided at both ends of the bottom of the caster frame (1), a rotating shaft (3) is rotatably provided between the circular plates (2), a wheel (4) is provided on the rotating shaft (3), a first through hole (5) is provided in the middle of the caster frame (1), a bearing (6) is installed in the first through hole (5), a first cylinder (7) is rotatably provided on the axis of the bearing (6), and a fixing plate (8) is fixed on the top of the first cylinder (7), characterized in that: A locking mechanism (20), wherein a fixing cylinder (9) coaxial with the rotating shaft (3) is fixed on the circular plate (2), a circular ring (10) is fixed at one end of the fixing cylinder (9), a plurality of circular columns (11) are sequentially arranged on the outer wall of the circular ring (10), a first square hole (12) is arranged on the axis of the circular column (11), and a locking mechanism (20) capable of pressing the wheel hub is respectively arranged on the first square hole (12); A ratchet assembly (30) is composed of a ratchet (40) and a drive frame (50), wherein a ratchet (40) capable of driving the locking mechanism (20) to work is rotatably provided on the fixed cylinder (9), and a drive frame (50) capable of driving the ratchet (40) to rotate is provided on the caster frame (1); A central control component (60) is provided with a second square hole (13) on the axis of the first cylinder (7), a moving rod (14) is provided in the second square hole (13), one end of the moving rod (14) is rotatably arranged on the driving frame (50), a pedal (15) is hinged on one side of the fixing plate (8), and a central control component (60) capable of controlling the gear position of the caster is provided between the pedal (15) and the moving rod (14); A locking group (70) is provided between the caster frame (1) and the first cylinder (7).

2. A caster lever brake system according to claim 1, characterized in that: The driving frame (50) comprises a first guide groove (51) symmetrically arranged on the caster frame (1), a rack (52) is movably arranged on the first guide groove (51), a transverse plate (53) is fixed between the two racks (52), and one end of the moving rod (14) is rotatably arranged on the transverse plate (53).

3. A caster lever brake system according to claim 2, characterized in that: The locking mechanism (20) comprises a square tube (21) arranged in a first square hole (12), a square rod (22) passing through the top of the square tube (21), an arc-shaped brake block (23) fixedly arranged on the top of the square rod (22), a first spring (24) fixedly arranged on the bottom of the square rod (22), an arc-shaped surface (25) capable of cooperating with a ratchet (40) arranged on the bottom of the square tube (21), a limit plate (26) arranged above the arc-shaped surface (25), and a second spring (27) arranged on the square tube (21) above the limit plate (26).

4. A caster lever brake system according to claim 3, characterized in that: The ratchet (40) comprises a first annular groove (41) arranged on a circular plate (2) and coaxial with a fixed cylinder (9); a second cylinder (42) is rotatably arranged on the first annular groove (41); a plurality of convex plates (43) are arranged in sequence at one end of the second cylinder (42); a plurality of first clamping grooves (44) which can cooperate with an arc surface (25) are arranged in sequence from low to high on the top of the convex plates (43); and a plurality of first teeth (45) which can cooperate with a rack (52) are arranged in sequence along the circumference on the outer wall of the second cylinder (42).

5. A caster pedal brake system according to claim 2, characterized in that: The locking group (70) includes a gear plate (71) fixed on the transverse plate (53) and coaxial with the moving rod (14), and a plurality of second teeth (72) that can mesh with the gear plate (71) are sequentially arranged along the circumference at the bottom of the first cylinder (7).

6. A caster pedal brake system according to claim 5, characterized in that: A groove (73) is provided at the bottom of the first cylinder (7), and a third spring (74) is sleeved in the groove (73) on the moving rod (14).

7. A caster pedal brake system according to claim 6, characterized in that: The central control component (60) includes a second guide groove (61) symmetrically arranged on the fixed plate (8) and located on both sides of the moving rod (14); a triangular plate (62) is movably arranged on the second guide groove (61); a plurality of second clamping grooves (63) are arranged in sequence from top to bottom on the oblique side of the triangular plate (62); trapezoidal blocks (64) are respectively arranged on both sides of the moving rod (14); an arc-shaped clamping block (65) that can cooperate with the second clamping groove (63) is fixed on the oblique side of the trapezoidal block (64); and a connecting rod (66) is hinged between the pedal (15) and the triangular plate (62).

8. A caster lever brake system according to claim 7, characterized in that: The pedal (15) is composed of a V-shaped frame (81) and a flat panel (82), the hinge point of the V-shaped frame (81) is located at the corner of the V-shaped frame (81), and the connecting rod (66) is hinged on one end of the V-shaped frame (81).

9. A caster lever brake system according to claim 1, characterized in that: A protective shell (91) is provided on the top of the fixing plate (8).

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