Pedal synchronous brake device

Abstract

The utility model provides a pedal synchronous brake device which comprises a hollow connecting rod and two sets of supporting walking mechanisms symmetrically installed at the two ends of the hollow connecting rod, and each set of supporting walking mechanism comprises an installation plate, a gantry triangular plate, two supporting wheels and a pedal synchronous brake assembly. The gantry triangular plate is fixedly mounted at the bottom of the mounting plate, the inner side of the gantry triangular plate is fixedly connected with the end of the hollow connecting rod, and the two supporting wheels are both mounted at the bottom of the mounting plate. According to the pedal plate synchronous brake device, a rigid frame is formed by the hollow connecting rod and the symmetrical supporting walking mechanism and matched with the synchronous connecting shaft to transmit power in two directions, it is guaranteed that brake actions on the two sides are synchronous, operation is convenient, and convenience is brought to workers; and in cooperation with linkage of the color direction and the pedal position, visual feedback of the brake state is achieved. And the operation stability is enhanced due to the anti-skid grains on the indicator board.

Description

Technical Field

[0001] This utility model relates to the field of braking device technology, specifically to a foot pedal synchronous braking device. Background Technology

[0002] In relevant operational scenarios, such as the support wheels installed at the bottom of hospital beds, the braking devices of these wheels may suffer from asynchronous braking on both sides, making operation inconvenient and failing to meet the staff's needs for efficient and convenient operation. Furthermore, the braking status is difficult to visually assess, impacting work efficiency and safety. Additionally, traditional braking devices exhibit poor braking stability and significant mechanical vibration, adversely affecting equipment and the working environment. This foot pedal synchronized braking device aims to solve these problems, improving the overall performance of the hospital bed and the user experience. Utility Model Content

[0003] The present invention aims to solve the problems mentioned in the background art by providing a foot pedal synchronous braking device.

[0004] The specific technical solution is as follows:

[0005] A foot pedal synchronous braking device includes: a hollow connecting rod and two sets of support and travel mechanisms symmetrically installed at both ends of the hollow connecting rod, wherein:

[0006] Each set of the supporting walking mechanism includes a mounting plate, a gantry triangle plate, two support wheels, and a foot pedal synchronous brake assembly. The gantry triangle plate is fixedly installed at the bottom of the mounting plate, and the inner side of the gantry triangle plate is fixedly connected to the end of the hollow connecting rod. The two support wheels are installed at the bottom of the mounting plate and distributed on both sides of the gantry triangle plate. The foot pedal synchronous brake assembly is installed on the gantry triangle plate.

[0007] The hollow connecting rod is internally mounted with a synchronous connecting shaft. The two ends of the synchronous connecting shaft are respectively rotatably inserted through the gantry triangle plates located at both ends of the hollow connecting rod, and the synchronous connecting shaft is respectively connected to the two sets of foot pedal synchronous brake assemblies.

[0008] The aforementioned foot pedal synchronous braking device, wherein each set of foot pedal synchronous braking assemblies includes a trapezoidal square frame brake plate mounted inside the gantry triangle plate by at least two sets of vertical elastic members, a foot pedal fixedly mounted at the end of the synchronous connecting shaft, a limiting rod fixedly mounted inside the trapezoidal square frame brake plate, a connecting arm fixedly mounted on the synchronous connecting shaft, and a roller rotatably mounted on the end of the connecting arm away from the synchronous connecting shaft via a rotating shaft, wherein:

[0009] The vertical elastic element can automatically drive the trapezoidal square brake plate to perform a reset movement upward on the gantry triangle plate;

[0010] The trapezoidal frame brake plate has a vertical clearance groove on its side wall for avoiding the synchronous connecting shaft, and the synchronous connecting shaft is movably inserted through the vertical clearance groove.

[0011] The foot pedal is located on the outside of the gantry triangle plate and can drive the synchronous connecting shaft to rotate;

[0012] The limiting rod can block the connecting arm;

[0013] The connecting arm is located inside the trapezoidal square brake plate;

[0014] Under the action of the vertical elastic element, the roller can always roll against the inner bottom wall of the trapezoidal frame brake plate. At the same time, under the action of the vertical elastic element, the foot pedal is always in an inclined state. When the foot pedal is in an inclined state, the connecting arm abuts against the limiting rod or the connecting arm disengages from the limiting rod. When the connecting arm abuts against the limiting rod, the roller drives the bottom of the trapezoidal frame brake plate to be lower than the bottom of the support wheel, so as to achieve a synchronous braking effect. When the connecting arm disengages from the limiting rod, the roller drives the bottom of the trapezoidal frame brake plate to be higher than the bottom of the support wheel, so as to achieve a synchronous release of the brake.

[0015] In the aforementioned foot pedal synchronous braking device, a green indicator plate is fixedly installed at one end of the foot pedal, and a red indicator plate is fixedly installed at the other end of the foot pedal. When the green indicator plate is above the red indicator plate, the foot pedal synchronous braking assembly is in a braking state; when the red indicator plate is above the green indicator plate, the foot pedal synchronous braking assembly is in a released braking state. Thus, pressing the green indicator plate releases the brake, and pressing the red indicator plate brakes the brake.

[0016] In the aforementioned foot pedal synchronous braking device, the upper surfaces of both the green indicator plate and the red indicator plate are integrally provided with anti-slip textures.

[0017] In the aforementioned foot pedal synchronous braking device, several rubber blocks are fixedly installed at the bottom of the trapezoidal square brake plate.

[0018] In the aforementioned foot pedal synchronous braking device, each set of vertical elastic elements includes a guide pin and a spring. The guide pin is vertically and fixedly installed at the bottom of the inner top wall of the gantry triangle plate, and the guide pin moves through the top wall of the trapezoidal square brake plate. The spring is fitted on the guide pin, with the upper end of the spring abutting against the bottom of the inner top wall of the trapezoidal square brake plate, and the lower end of the spring abutting against the bottom end of the guide pin. The spring is always in a compressed state.

[0019] In the aforementioned foot pedal synchronous braking device, each of the guide pins is movably fitted with an annular washer one and an annular washer two. The annular washer one abuts against the bottom end of the guide pin and the bottom end of the spring, and the annular washer two abuts against the upper end of the spring and the bottom of the inner top wall of the trapezoidal square brake plate.

[0020] In the aforementioned foot pedal synchronous braking device, in order to prevent the connecting arm from shifting axially along the synchronous connecting shaft and affecting the overall stability, two retaining rings are distributed on both sides of each connecting arm, and the retaining rings are fixedly fitted on the synchronous connecting shaft.

[0021] In the aforementioned foot pedal synchronous braking device, a guide sleeve is installed at the junction of the gantry triangle plate and the synchronous connecting shaft. The outer ring surface of the guide sleeve is fixedly connected to the gantry triangle plate, and the inner ring surface of the guide sleeve is rotatably connected to the synchronous connecting shaft.

[0022] In the aforementioned foot pedal synchronous braking device, all the support wheels are swivel wheels.

[0023] This utility model has the following beneficial effects:

[0024] 1. Synchronization and Convenience: A rigid frame is formed by the hollow connecting rod and the symmetrical support walking mechanism. With the synchronous connecting shaft, power is transmitted in both directions to ensure that the braking action on both sides is synchronized, making operation convenient and bringing convenience to the staff.

[0025] 2. Visualization and Anti-slip: The green and red indicator panels on the foot pedals, linked to the pedal position, provide visual feedback on the braking status. The anti-slip texture on the indicator panels enhances operational stability.

[0026] 3. High-efficiency braking: The rubber block at the bottom of the trapezoidal square brake pad increases the static friction with the ground, improves braking stability, and at the same time buffers the impact force and reduces mechanical vibration.

[0027] 4. Stable and reliable: The design of components such as vertical elastic elements, limit rods, retaining rings, and guide sleeves ensures the stability of the device during braking, resetting, and other actions, prevents component displacement and jamming, and ensures rapid response.

[0028] 5. High mobility: The support wheels are omnidirectional wheels, which can move freely in multiple directions and improve the mobility of the device. Attached Figure Description

[0029] Figure 1 A schematic diagram of the foot pedal synchronous braking device provided in an embodiment of this utility model;

[0030] Figure 2 A cross-sectional structural schematic diagram of the foot pedal synchronous braking device provided in an embodiment of this utility model;

[0031] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0032] Figure 4 A schematic diagram of the foot pedal synchronous braking device in braking state according to an embodiment of the present utility model;

[0033] Figure 5 A schematic diagram of the foot pedal synchronous braking device in the contact braking state provided in the embodiment of this utility model;

[0034] Figure 6 A cross-sectional plan view of the foot pedal synchronous braking device provided in the embodiment of this utility model in the contact braking state;

[0035] Figure 7 A cross-sectional perspective view of the foot pedal synchronous braking device provided in the embodiment of this utility model in the contact braking state.

[0036] In the attached image:

[0037] 1. Hollow connecting rod; 2. Gantry triangle plate; 3. Mounting plate; 4. Support wheel; 5. Trapezoidal square brake plate; 501. Vertical clearance groove; 6. Foot pedal; 601. Green indicator plate; 602. Red indicator plate; 7. Synchronous connecting shaft; 8. Limiting rod; 9. Rubber block; 10. Connecting arm; 11. Roller; 12. Guide pin; 13. Annular washer one; 14. Spring; 15. Annular washer two; 16. Guide sleeve; 17. Retaining ring. Detailed Implementation

[0038] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0040] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Example

[0043] The foot pedal synchronous braking device provided in this embodiment, such as Figures 1-7 As shown, it includes: a hollow connecting rod 1 and two sets of support and walking mechanisms symmetrically installed at both ends of the hollow connecting rod 1.

[0044] Each set of supporting walking mechanisms includes a mounting plate 3, a gantry triangle plate 2, two support wheels 4, and a foot pedal synchronous brake assembly. The gantry triangle plate 2 is fixedly installed at the bottom of the mounting plate 3, and the inner side of the gantry triangle plate 2 is fixedly connected to the end of the hollow connecting rod 1. The two support wheels 4 are both installed at the bottom of the mounting plate 3 and distributed on both sides of the gantry triangle plate 2. The foot pedal synchronous brake assembly is installed on the gantry triangle plate 2.

[0045] The hollow connecting rod 1 has a synchronous connecting shaft 7 rotatably installed inside. The two ends of the synchronous connecting shaft 7 rotatably pass through the gantry triangle plates 2 located at both ends of the hollow connecting rod 1, and the synchronous connecting shaft 7 is respectively connected to the two sets of foot pedal synchronous brake assemblies.

[0046] The foot pedal synchronous braking device using the above scheme forms a rigid frame with the hollow connecting rod 1 and the symmetrically distributed support walking mechanism, ensuring the synchronicity of braking actions on both sides. The synchronous connecting shaft 7 realizes bidirectional power transmission, enabling the braking components on both sides to operate in conjunction, making braking and contacting the brake more convenient and bringing greater convenience to the staff.

[0047] Each set of foot pedal synchronous braking assemblies includes a trapezoidal square frame brake plate 5 installed inside the gantry triangle plate 2 via at least two sets of vertical elastic elements, a foot pedal 6 fixedly installed at the end of the synchronous connecting shaft 7, a limiting rod 8 fixedly installed inside the trapezoidal square frame brake plate 5, a connecting arm 10 fixedly installed on the synchronous connecting shaft 7, and a roller 11 rotatably installed on the end of the connecting arm 10 away from the synchronous connecting shaft 7 via a rotating shaft, wherein:

[0048] The vertical elastic element can automatically drive the trapezoidal square brake plate 5 to perform a reset movement on the gantry triangle plate 2; the side wall of the trapezoidal square brake plate 5 is provided with a vertical clearance groove 501 for avoiding the synchronous connecting shaft 7, and the synchronous connecting shaft 7 is movably connected through the vertical clearance groove 501; the foot pedal 6 is located on the outside of the gantry triangle plate 2 and can drive the synchronous connecting shaft 7 to rotate; the limiting rod 8 can block the connecting arm 10 and limit the descent height of the connecting arm 10, providing the necessary basic conditions for subsequent braking; the connecting arm 10 is located inside the trapezoidal square brake plate 5.

[0049] Under the action of the vertical elastic element, the roller 11 can always roll against the inner bottom wall of the trapezoidal frame brake plate 5. At the same time, under the action of the vertical elastic element, the foot pedal 6 is always in an inclined state. When the foot pedal 6 is in an inclined state, the connecting arm 10 is abutted against the limit rod 8 or the connecting arm 10 is disengaged from the limit rod 8. When the connecting arm 10 is abutted against the limit rod 8, the roller 11 drives the bottom of the trapezoidal frame brake plate 5 to be lower than the bottom of the support wheel 4, so as to achieve a synchronous braking effect. When the connecting arm 10 is disengaged from the limit rod 8, the roller 11 drives the bottom of the trapezoidal frame brake plate 5 to be higher than the bottom of the support wheel 4, so as to achieve a synchronous release of the brake.

[0050] Among them, the automatic reset design of the vertical elastic element can ensure the response speed of the braking state switching and provide the basic conditions for braking and releasing the brake. The blocking mechanism of the limit rod 8 and the connecting arm 10 establishes a clear braking point to avoid the inability to perform braking operation.

[0051] To facilitate clear understanding of the braking status, a green indicator plate 601 is fixedly installed at one end of the foot pedal 6, and a red indicator plate 602 is fixedly installed at the other end of the foot pedal 6. When the green indicator plate 601 is above the red indicator plate 602, the foot pedal synchronous braking assembly is in the braking state; when the red indicator plate 602 is above the green indicator plate 601, the foot pedal synchronous braking assembly is in the released braking state. Thus, pressing the green indicator plate 601 releases the brake, and pressing the red indicator plate 602 brakes the brake. The color position is linked to the pedal position, providing visual feedback on the braking status.

[0052] To improve the anti-slip performance of the green indicator 601 and the red indicator 602 and enhance operational stability, anti-slip textures are integrally formed on the upper surface of both the green indicator 601 and the red indicator 602.

[0053] To further improve the braking effect, several rubber blocks 9 are fixedly installed at the bottom of the trapezoidal square brake plate 5. When braking, the bottom of the trapezoidal square brake plate 5 is lower than the bottom of the support wheel 4, so that the rubber blocks 9 can increase the static friction with the ground, thereby improving the stability of braking. At the same time, the elastic material can buffer the impact force and reduce the mechanical vibration at the moment of braking.

[0054] Each set of vertical elastic elements includes a guide pin 12 and a spring 14. The guide pin 12 is vertically and fixedly installed at the bottom of the inner top wall of the gantry triangle plate 2, and the guide pin 12 moves through the top wall of the trapezoidal square brake plate 5. The spring 14 is fitted on the guide pin 12, with the upper end of the spring 14 abutting against the bottom of the inner top wall of the trapezoidal square brake plate 5, and the lower end of the spring 14 abutting against the bottom end of the guide pin 12. The spring 14 is always in a compressed state. The guide pin 12 and the spring 14 cooperate to provide power for braking or releasing the brake. At the same time, the guide pin 12 is used to limit the vertical movement trajectory of the brake plate to prevent deflection and jamming. The compressed spring 14 is used to provide a restoring force to ensure a rapid response when the brake is released.

[0055] In order to improve the stability of the vertical elastic element, an annular washer 13 and an annular washer 2 15 are movably fitted on each guide pin 12. The annular washer 13 is pressed between the bottom end of the guide pin 12 and the bottom end of the spring 14, and the annular washer 2 15 is pressed between the upper end of the spring 14 and the bottom of the inner top wall of the trapezoidal square brake plate 5.

[0056] To prevent the connecting arm 10 from shifting axially along the synchronous connecting shaft 7 and affecting the overall stability, two retaining rings 17 are distributed on both sides of each connecting arm 10, and the retaining rings 17 are fixedly fitted onto the synchronous connecting shaft 7.

[0057] To improve the connection stability between the gantry triangle plate 2 and the synchronous connecting shaft 7, a guide sleeve 16 is installed at the junction of the gantry triangle plate 2 and the synchronous connecting shaft 7. The outer ring surface of the guide sleeve 16 is fixedly connected to the gantry triangle plate 2, and the inner ring surface of the guide sleeve 16 is in contact with and rotatably connected to the synchronous connecting shaft 7.

[0058] Among them, the support wheels 4 are all omnidirectional wheels, which can move freely in multiple directions and improve maneuverability.

[0059] In summary, the foot pedal synchronous braking device provided in this embodiment has the following advantages:

[0060] 1. Synchronization and Convenience: The hollow connecting rod 1 and the symmetrical support walking mechanism form a rigid frame, which, together with the synchronous connecting shaft 7, transmits power in both directions, ensuring that the braking action on both sides is synchronized, making operation convenient and bringing convenience to the staff.

[0061] 2. Visualization and Anti-slip: The green indicator 601 and red indicator 602 on the foot pedal 6, in conjunction with their color orientation and pedal position, provide visual feedback on the braking status. The anti-slip texture on the indicator plates enhances operational stability.

[0062] 3. High-efficiency braking: The rubber block 9 at the bottom of the trapezoidal square brake plate 5 increases the static friction with the ground, improves braking stability, and at the same time buffers the impact force and reduces mechanical vibration.

[0063] 4. Stable and reliable: The design of vertical elastic components (guide pin 12, spring 14, annular washer 13, annular washer 2 15), limit rod 8, retaining ring 17, guide sleeve 16 and other components ensures the stability of the device during braking, resetting and other actions, prevents component displacement and jamming, and ensures rapid response.

[0064] 5. High mobility: The support wheel 4 adopts omnidirectional wheels, which can move freely in multiple directions and improve the mobility of the device.

[0065] Working principle:

[0066] This device is mainly used for installation at the bottom of hospital beds to provide convenience for staff.

[0067] 1. Overall linkage mechanism: The hollow connecting rod 1 and the synchronous connecting shaft 7 connect the two sets of symmetrical support and walking mechanisms. When the synchronous connecting shaft 7 rotates, it drives the foot pedals 6 on both sides to rotate synchronously, thereby realizing the linkage of the brake components on both sides.

[0068] 2. Braking and releasing the brake: When the foot pedal 6 is pressed, the synchronous connecting shaft 7 rotates, and the connecting arm 10 rotates accordingly. When the connecting arm 10 abuts against the limit rod 8, the roller 11 drives the trapezoidal frame brake plate 5 to descend, its bottom being lower than the bottom of the support wheel 4, and the rubber block 9 contacts the ground to achieve braking; when the connecting arm 10 disengages from the limit rod 8, under the action of the vertical elastic elements (guide pin 12, spring 14, annular washer 13, annular washer 2 15), the trapezoidal frame brake plate 5 rises, its bottom being higher than the bottom of the support wheel 4, thus releasing the brake.

[0069] 3. Reset Mechanism: The vertical elastic element consists of a guide pin 12 and a spring 14. The spring 14 is always in a compressed state, providing a reset force for the brake plate. When the brake is released, the spring 14 pushes the brake plate upward to reset.

[0070] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A foot pedal synchronous braking device, characterized in that, include: Hollow connecting rod (1) and two sets of support and walking mechanisms symmetrically installed at both ends of the hollow connecting rod (1), wherein: Each set of the supporting walking mechanism includes a mounting plate (3), a gantry triangle plate (2), two support wheels (4), and a foot pedal synchronous brake assembly. The gantry triangle plate (2) is fixedly installed at the bottom of the mounting plate (3), and the inner side of the gantry triangle plate (2) is fixedly connected to the end of the hollow connecting rod (1). The two support wheels (4) are installed at the bottom of the mounting plate (3) and distributed on both sides of the gantry triangle plate (2). The foot pedal synchronous brake assembly is installed on the gantry triangle plate (2). The hollow connecting rod (1) is rotatably mounted with a synchronous connecting shaft (7). The two ends of the synchronous connecting shaft (7) are respectively rotatably inserted through the gantry triangle plate (2) located at both ends of the hollow connecting rod (1), and the synchronous connecting shaft (7) is respectively connected to the two sets of foot pedal synchronous brake assemblies.

2. The foot pedal synchronous braking device according to claim 1, characterized in that, Each set of foot pedal synchronous braking assemblies includes a trapezoidal square brake plate (5) installed inside the gantry triangle plate (2) by at least two sets of vertical elastic elements, a foot pedal (6) fixedly installed at the end of the synchronous connecting shaft (7), a limiting rod (8) fixedly installed inside the trapezoidal square brake plate (5), a connecting arm (10) fixedly installed on the synchronous connecting shaft (7), and a roller (11) rotatably installed at the end of the connecting arm (10) away from the synchronous connecting shaft (7) via a rotating shaft, wherein: The vertical elastic element can automatically drive the trapezoidal square brake plate (5) to perform a reset movement upward on the gantry triangle plate (2); The trapezoidal frame brake plate (5) has a vertical clearance groove (501) on its side wall for avoiding the synchronous connecting shaft (7), and the synchronous connecting shaft (7) is movably inserted through the vertical clearance groove (501). The foot pedal (6) is located on the outside of the gantry triangle plate (2) and can drive the synchronous connecting shaft (7) to rotate; The limiting rod (8) can block the connecting arm (10); The connecting arm (10) is located inside the trapezoidal frame brake plate (5); Under the action of the vertical elastic member, the roller (11) can always roll against the inner bottom wall of the trapezoidal frame brake plate (5). At the same time, under the action of the vertical elastic member, the foot pedal (6) is always in an inclined state. When the foot pedal (6) is in an inclined state, the connecting arm (10) abuts against the limiting rod (8) or the connecting arm (10) disengages from the limiting rod (8). When the connecting arm (10) abuts against the limiting rod (8), the roller (11) drives the bottom of the trapezoidal frame brake plate (5) to be lower than the bottom of the support wheel (4) to achieve a synchronous braking effect. When the connecting arm (10) disengages from the limiting rod (8), the roller (11) drives the bottom of the trapezoidal frame brake plate (5) to be higher than the bottom of the support wheel (4) to achieve a synchronous release of the brake.

3. The foot pedal synchronous braking device according to claim 2, characterized in that, A green indicator plate (601) is fixedly installed at one end of the foot pedal (6), and a red indicator plate (602) is fixedly installed at the other end of the foot pedal (6). When the green indicator plate (601) is above the red indicator plate (602), the foot pedal synchronous braking assembly is in a braking state. When the red indicator plate (602) is above the green indicator plate (601), the foot pedal synchronous braking assembly is in a released braking state. Thus, pressing the green indicator plate (601) releases the brake, and pressing the red indicator plate (602) brakes the pedal.

4. The foot pedal synchronous braking device according to claim 3, characterized in that, The upper surface of both the green indicator plate (601) and the red indicator plate (602) is integrally provided with anti-slip texture.

5. The foot pedal synchronous braking device according to claim 2, characterized in that, Several rubber blocks (9) are fixedly installed at the bottom of the trapezoidal square brake plate (5).

6. The foot pedal synchronous braking device according to claim 2, characterized in that, Each set of vertical elastic elements includes a guide pin (12) and a spring (14). The guide pin (12) is vertically and fixedly installed at the bottom of the inner top wall of the gantry triangle plate (2), and the guide pin (12) moves through the top wall of the trapezoidal square brake plate (5). The spring (14) is fitted on the guide pin (12). The upper end of the spring (14) abuts against the bottom of the inner top wall of the trapezoidal square brake plate (5), and the bottom end of the spring (14) abuts against the bottom end of the guide pin (12). The spring (14) is always in a compressed state.

7. The foot pedal synchronous braking device according to claim 6, characterized in that, Each of the guide pins (12) is movably fitted with an annular washer one (13) and an annular washer two (15). The annular washer one (13) is pressed against the bottom end of the guide pin (12) and the bottom end of the spring (14). The annular washer two (15) is pressed against the upper end of the spring (14) and the bottom of the inner top wall of the trapezoidal square brake plate (5).

8. The foot pedal synchronous braking device according to claim 2, characterized in that, Two retaining rings (17) are distributed on both sides of each connecting arm (10), and the retaining rings (17) are fixedly fitted on the synchronous connecting shaft (7).

9. The foot pedal synchronous braking device according to claim 2, characterized in that, A guide sleeve (16) is installed at the junction of the gantry triangle plate (2) and the synchronous connecting shaft (7). The outer ring surface of the guide sleeve (16) is fixedly connected to the gantry triangle plate (2), and the inner ring surface of the guide sleeve (16) is in contact with and rotatably connected to the synchronous connecting shaft (7).

10. The foot pedal synchronous braking device according to any one of claims 1-9, characterized in that, All the support wheels (4) are omnidirectional wheels.

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