Pedal system with reset key

Abstract

The application provides a trolley pedal system with a reset key, and relates to the technical field of trolley pedal systems. The trolley pedal system comprises a trolley base, a first gear switching locking mechanism, a second gear switching locking mechanism and a reset unlocking mechanism arranged in the trolley base. The first gear switching locking mechanism is connected with a first central control caster assembly and controls the first central control caster assembly to switch gears through a first pedal plate. The second gear switching locking mechanism is connected with a second central control caster assembly, a third central control caster assembly and a fourth central control caster assembly and controls the second central control caster assembly, the third central control caster assembly and the fourth central control caster assembly to switch gears through a second pedal plate. The reset unlocking mechanism is used for controlling the reset unlocking of the first pedal plate and the second pedal plate. In the application, the automatic reset unlocking of the first pedal plate and the second pedal plate can be realized through the reset unlocking mechanism, and the upward force needs not to be separately applied to the first pedal plate and the second pedal plate, so that the operator can operate conveniently.

Description

Technical Field

[0001] This invention relates to the field of trolley pedal system technology, and particularly to a pedal system with a reset button. Background Technology

[0002] Central locking casters are braked by rotating the hexagonal hole on the central locking lever. Central locking casters mainly come in the following types: three-speed, three-function (swivel, fixed, brake 30° / speed), three-speed, two-function (neutral, swivel, brake 30° / speed), and two-speed, two-function (swivel, brake 30° / speed). Traditional central locking caster pedal-operated shifting, locking, and unlocking systems can be divided into two types: three-pedal shifting, locking, and unlocking systems and two-pedal shifting, locking, and unlocking systems. The two-pedal shifting, locking, and unlocking system consists of two pedals. The left pedal controls the shifting and locking of the left front, left rear, and right rear central locking casters, functioning to switch all central locking casters from a free state to a fully locked state. The right pedal controls the shifting and locking of the right front caster, functioning to switch all central locking casters from a free state to a fixed state.

[0003] However, when resetting and unlocking the aforementioned dual-pedal gear shifting lock-unlock system, it is necessary to use the foot to apply an upward force to the pedal in the opposite direction to lift the pedal, which is difficult to operate and prone to misoperation, reducing the user experience and comfort of the device. Summary of the Invention

[0004] This invention provides a foot pedal system with a reset button to solve the technical problem that current dual-pedal gear shifting locking and unlocking systems require the user to apply an upward force to the pedal to lift it during reset and unlocking, which is difficult to operate, prone to misoperation, and reduces the user experience and comfort of the device.

[0005] To solve the above-mentioned technical problems, the present invention discloses a foot pedal system with a reset button, comprising: a trolley base, a base plate on the trolley base, and a first central control caster assembly, a second central control caster assembly, a third central control caster assembly, and a fourth central control caster assembly arranged sequentially at the four corners of the bottom of the trolley base. The first central control caster assembly, the second central control caster assembly, the third central control caster assembly, and the fourth central control caster assembly are all fixed to the trolley base via the base plate. A first gear shifting locking mechanism, a second gear shifting locking mechanism, and a reset unlocking mechanism are provided inside the trolley base. The first gear shifting locking mechanism is connected to the first central control caster assembly and controls the gear shifting of the first central control caster assembly via a foot pedal one. The second gear shifting locking mechanism is connected to the second, third, and fourth central control caster assemblies and controls the gear shifting of the second, third, and fourth central control caster assemblies via a foot pedal two. The reset unlocking mechanism is used to control the reset and unlocking of the first and second foot pedals.

[0006] Preferably, the first gear shifting locking mechanism includes a foot pedal, which is mounted on a first foot pedal link. The end of the first foot pedal link near the trolley base is connected to the first central control wheel shaft. The two ends of the first central control wheel shaft are rotatably connected to two first bearing seats, which are set on the trolley base. The end of the first central control wheel shaft near the first central control caster assembly is connected to the first central control caster assembly through a first transmission assembly.

[0007] Preferably, the first transmission assembly includes a first central control wheel connecting plate one, one end of the first central control wheel connecting plate one is connected to the end of the first central control wheel shaft away from the first foot pedal connecting rod, the other end of the first central control wheel connecting plate one is hinged to one end of the first central control wheel connecting rod, the other end of the first central control wheel connecting rod is hinged to one end of the first central control wheel connecting plate two, the other end of the first central control wheel connecting plate two is connected to one end of the first central control wheel adjusting rod, the other end of the first central control wheel adjusting rod is connected to the first stop lever of the first central control caster assembly, the first central control wheel adjusting rod is rotatably connected to the upper end of the first support seat, and the first support seat is fixedly connected to the trolley base.

[0008] Preferably, the second gear shifting locking mechanism includes a second foot pedal, which is mounted on a second foot pedal linkage. The end of the second foot pedal linkage near the trolley base is connected to a second central control wheel shaft. Both ends of the second central control wheel shaft are rotatably connected to two second bearing seats, which are mounted on the trolley base. The end of the second central control wheel shaft near the second central control caster assembly is connected to the second central control caster assembly, the third central control caster assembly, and the fourth central control caster assembly via a second transmission assembly.

[0009] Preferably, the second transmission assembly includes a second central control wheel connecting plate one, one end of which is connected to the end of the second central control wheel pivot away from the second foot pedal connecting rod, and the other end of which is hinged to the second central control wheel connecting rod one. The end of the second central control wheel connecting rod one near the second central control caster assembly is hinged to one end of a second central control wheel connecting plate two, and the other end of the second central control wheel connecting plate two is connected to one end of a second central control wheel adjusting rod. The other end of the second central control wheel adjusting rod is connected to the second stop lever of the second central control caster assembly. The second central control wheel adjusting rod is rotatably connected to the upper end of the second support seat, and the second support seat is fixedly connected to the trolley base. The end of the second central control wheel connecting rod one near the third central control caster assembly is hinged to the second foot pedal connecting plate two. One end of the third central control wheel connecting plate is hinged, the other end of the third central control wheel connecting plate is connected to one end of the third central control wheel adjusting rod, the other end of the third central control wheel adjusting rod is connected to the third stop lever of the third central control caster assembly, the third central control wheel adjusting rod is rotatably connected to the upper end of the third support seat, the third support seat is fixedly connected to the trolley base, the end of the third central control wheel adjusting rod away from the third central control caster assembly is fixedly connected to one end of the second central control wheel connecting rod, the other end of the second central control wheel connecting rod is fixedly connected to one end of the fourth central control wheel adjusting rod, the other end of the fourth central control wheel adjusting rod is connected to the fourth stop lever of the fourth central control caster assembly, the fourth central control wheel adjusting rod is rotatably connected to the upper end of the fourth support seat, and the fourth support seat is fixedly connected to the trolley base.

[0010] Preferably, the gear sequence of the second, third, and fourth central control caster assemblies is the same but different from that of the first central control caster assembly.

[0011] Preferably, the reset and unlocking mechanism includes a locking component, an unlocking component, and a first unlocking link bracket located between the first foot pedal link and the second foot pedal link. The first unlocking link bracket is fixedly connected to the trolley base. Locking holes are provided at the ends of the first foot pedal link near the first central control wheel shaft and the second foot pedal link near the second central control wheel shaft. Unlocking rods are symmetrically arranged on the left and right sides of the first unlocking link bracket. The end of the unlocking rod away from the first unlocking link bracket passes through the locking hole and connects to the second unlocking link bracket. The second unlocking link bracket is fixedly connected to the trolley base. A locking component is provided on the unlocking rod. The locking component is used to lock the first foot pedal link and the second foot pedal link, and the unlocking component is used to unlock the locked first foot pedal link and the second foot pedal link.

[0012] Preferably, the locking assembly includes a reset lock block slidably disposed on the unlocking rod, the reset lock block being adapted to the lock hole, a first unlocking spring being disposed on the side of the reset lock block near the first unlocking linkage bracket, an unlocking base plate being disposed on the side of the first unlocking spring near the first unlocking linkage bracket, the unlocking base plate being slidably connected to the unlocking rod, a first inclined surface being disposed on the side of the unlocking base plate near the first unlocking linkage bracket, and a second unlocking spring being disposed on the side of the reset lock block near the second unlocking linkage bracket, both the first and second unlocking springs being sleeved on the unlocking rod.

[0013] Preferably, the reset lock block is stepped, and the end of the reset lock block near the first unlocking linkage bracket is set as the first shaft. The first shaft platform is connected to the second shaft platform through the transition shaft. The diameter of the first shaft platform is smaller than the diameter of the second shaft platform. The lock holes are arranged sequentially from bottom to top, including the first hole, the transition hole and the second hole. The inner wall of the first hole is adapted to the outer wall of the first shaft platform, the inner wall of the transition hole is adapted to the outer diameter of the transition shaft, and the inner wall of the second hole is adapted to the outer wall of the second shaft platform.

[0014] Preferably, the unlocking assembly includes several reset torsion springs and several reset foot pedal support rods disposed above the first unlocking linkage bracket. The lower end of the reset foot pedal support rod is connected to the trolley base. The reset foot pedal support rod is a telescopic rod. A reset support rod spring is sleeved on the outside of the reset foot pedal support rod. The upper end of the reset foot pedal support rod is connected to the inner wall of the reset foot pedal. Unlocking upper plates are symmetrically disposed on the inner walls of the left and right sides of the reset foot pedal. The unlocking upper plates are located above the unlocking bottom plate. Unlocking plates are symmetrically disposed on the front and rear sides of the unlocking upper plates. The lower end of the unlocking plate extends to the top of the unlocking bottom plate and is provided with a second inclined surface. The second inclined surface is adapted to the first inclined surface. Several reset torsion springs are respectively sleeved on the first central control wheel shaft and the second central control wheel shaft one. One end of the reset torsion spring sleeved on the first central control wheel shaft is connected to the first central control wheel shaft, and the other end is connected to the first foot pedal linkage. One end of the reset torsion spring sleeved on the second central control wheel shaft one is connected to the second central control wheel shaft two, and the other end is connected to the second foot pedal linkage.

[0015] The technical solution of the present invention has the following advantages: The present invention discloses a foot pedal system with a reset button, comprising: a trolley base, a base plate disposed on the trolley base, and a first central control caster assembly, a second central control caster assembly, a third central control caster assembly, and a fourth central control caster assembly disposed sequentially at the four corners of the bottom of the trolley base. The first central control caster assembly, the second central control caster assembly, the third central control caster assembly, and the fourth central control caster assembly are all fixed to the trolley base through the base plate. A first gear shifting locking mechanism, a second gear shifting locking mechanism, and a reset unlocking mechanism are disposed inside the trolley base. The first gear shifting locking mechanism is connected to the first central control caster assembly and controls the first central control caster assembly to shift gears through a foot pedal one. The second gear shifting locking mechanism is connected to the second central control caster assembly, the third central control caster assembly, and the fourth central control caster assembly and controls the second central control caster assembly, the third central control caster assembly, and the fourth central control caster assembly to shift gears through a foot pedal two. The reset unlocking mechanism is used to control the reset and unlocking of the first and second foot pedals. In this invention, the automatic unlocking and resetting of foot pedal one and foot pedal two can be achieved through the reset and unlocking mechanism, without the need to apply an upward force to foot pedal one and foot pedal two separately. This improves operability, makes it easier for the operator to operate, and enhances the user's experience and comfort. Furthermore, by resetting and unlocking through the reset and unlocking mechanism, the problem of the foot being scratched by the foot pedal when applying an upward force to the foot pedal is avoided, thus improving the reliability and safety of the product.

[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the means particularly pointed out in the written description and the accompanying drawings.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a foot pedal system with a reset button according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the first gear shifting locking mechanism and the second gear shifting locking mechanism in this invention;

[0021] Figure 3 This is a schematic diagram of the unlocking state of the reset and unlocking mechanism in this invention;

[0022] Figure 4This is a schematic diagram of the locked state of the reset and unlocking mechanism in this invention;

[0023] Figure 5 This is a partial cross-sectional view of the reset and unlocking mechanism in this invention;

[0024] Figure 6 For the present invention Figure 5 Partial sectional view at point AA.

[0025] In the diagram: 1. Trolley base; 2. Base plate; 3. First central control caster assembly; 4. Second central control caster assembly; 5. Third central control caster assembly; 6. Fourth central control caster assembly; 7. First gear shifting locking mechanism; 8. Second gear shifting locking mechanism; 9. Reset and unlocking mechanism; 10. Foot pedal one; 11. Foot pedal two; 12. First foot pedal connecting rod; 13. First central control wheel shaft; 14. First bearing seat; 15. First central control wheel connecting plate one; 16. First central control wheel connecting rod; 17. First central control wheel connecting plate two; 18. First central control wheel adjusting rod; 19. Second foot pedal connecting rod; 20. Second central control wheel shaft; 21. Second central control wheel connecting plate one; 22. Second central control wheel connecting rod one; 23. 24. Second central control wheel connecting plate; 25. Second central control wheel adjusting rod; 26. Second central control wheel connecting plate; 27. Third central control wheel adjusting rod; 28. Second central control wheel connecting rod; 29. ​​Fourth central control wheel adjusting rod; 20. First unlocking connecting rod bracket; 31. Lock hole; 32. Unlocking rod; 33. Second unlocking connecting rod bracket; 34. Reset lock block; 35. First unlocking spring; 36. Unlocking base plate; 37. Second unlocking spring; 38. First shaft platform; 39. Transition shaft; 40. Second shaft platform; 41. First hole; 42. Transition hole; 43. Second hole; 44. Reset torsion spring; 45. Reset foot pedal support connecting rod; 46. Reset support connecting rod spring; 47. Reset foot pedal; 48. Unlocking upper plate; 49. Unlocking plate. Detailed Implementation

[0026] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] Example 1:

[0029] This invention provides a foot pedal system with a reset button, such as... Figure 1-6 As shown, it includes: a trolley base 1, a base plate 2 mounted on the trolley base 1, and a first central control caster assembly 3, a second central control caster assembly 4, a third central control caster assembly 5, and a fourth central control caster assembly 6 sequentially mounted at the four corners of the bottom of the trolley base 1. All four central control caster assemblies are fixed to the trolley base 1 via the base plate 2. A first gear shifting locking mechanism 7, a second gear shifting locking mechanism 8, and a reset unlocking mechanism are installed inside the trolley base 1. Mechanism 9, the first gear shifting locking mechanism 7 is connected to the first central control caster assembly 3 and controls the first central control caster assembly 3 to perform gear shifting through foot pedal 10, the second gear shifting locking mechanism 8 is connected to the second central control caster assembly 4, the third central control caster assembly 5 and the fourth central control caster assembly 6 and controls the second central control caster assembly 4, the third central control caster assembly 5 and the fourth central control caster assembly 6 to perform gear shifting through foot pedal 2 11, and the reset unlocking mechanism 9 is used to control the reset and unlocking of foot pedal 10 and foot pedal 2 11;

[0030] The gear sequence of the second central control caster assembly 4, the third central control caster assembly 5, and the fourth central control caster assembly 6 is the same but different from the gear sequence of the first central control caster assembly 3.

[0031] The working principle and beneficial effects of the above technical solution are as follows: When the first pedal 10 is pressed, the first gear shifting locking mechanism 7 can control the first central control caster assembly 3 to shift gears; when the second pedal 11 is pressed, the second gear shifting locking mechanism 8 can control the second central control caster assembly 4, the third central control caster assembly 5, and the fourth central control caster assembly 6 to shift gears simultaneously. Specifically, the first central control caster assembly 3, the second central control caster assembly 4, the third central control caster assembly 5, and the fourth central control caster assembly 6... All are existing three-position, three-function center-lock casters. The adjustment angle is 30° per position, and the positions from top to bottom are: directional, swivel, and locking. The center-lock caster's lever can rotate axially, and the position changes with a 180° axial rotation, thus becoming locking, swivel, and directional. To achieve switching between the three functions of the center-lock caster, the fixed direction of the center-lock caster lever in this application is inconsistent. The position sequence of the first center-lock caster assembly 3 on the right front is different from that of the second center-lock caster assembly 4 on the left front and the third center-lock caster on the left rear. The gear sequence of component 5 and the fourth central control caster component 6 at the right rear is different, while the gear sequence of the second central control caster component 4 at the left front, the third central control caster component 5 at the left rear, and the fourth central control caster component 6 at the right rear is the same. This allows the central control caster to switch between three functions by pressing down on foot pedal 10 and foot pedal 2 11. Finally, the reset and unlocking mechanism 9 enables automatic unlocking and reset of foot pedal 10 and foot pedal 2 11 without requiring separate upward force to be applied to foot pedal 10 and foot pedal 2 11, improving operability, facilitating operation, and enhancing user experience and comfort. Furthermore, due to the insufficient reliability and safety performance of traditional designs, the foot needs to apply upward force to the foot pedal in the opposite direction when resetting the pedal, which may cause the foot to come into contact with the sharp edge of the foot pedal, potentially causing injury and posing a safety hazard. The reset and unlocking mechanism 9 eliminates the problem of the foot being scratched by the foot pedal when applying upward force, thus improving the reliability and safety of the product.

[0032] Example 2

[0033] Based on the above embodiment 1, as follows Figure 2 As shown, the first gear shifting locking mechanism 7 includes a foot pedal 10, which is mounted on a first foot pedal connecting rod 12. The end of the first foot pedal connecting rod 12 near the trolley base 1 is connected to the first central control wheel shaft 13. The two ends of the first central control wheel shaft 13 are rotatably connected to two first bearing seats 14 respectively. The two first bearing seats 14 are set on the trolley base 1. The end of the first central control wheel shaft 13 near the first central control caster assembly 3 is connected to the first central control caster assembly 3 through a first transmission assembly.

[0034] The first transmission assembly includes a first central control wheel connecting plate 15. One end of the first central control wheel connecting plate 15 is connected to the end of the first central control wheel shaft 13 away from the first foot pedal connecting rod 12. The other end of the first central control wheel connecting plate 15 is hinged to one end of the first central control wheel connecting rod 16. The other end of the first central control wheel connecting rod 16 is hinged to one end of the first central control wheel connecting plate 17. The other end of the first central control wheel connecting plate 17 is connected to one end of the first central control wheel adjusting rod 18. The other end of the first central control wheel adjusting rod 18 is connected to the first stop lever of the first central control caster assembly 3. The first central control wheel adjusting rod 18 is rotatably connected to the upper end of the first support seat. The first support seat is fixedly connected to the trolley base 1.

[0035] The working principle and beneficial effects of the above technical solution are as follows: When the first gear shifting locking mechanism 7 is working, the foot pedal 10 is pressed down. The foot pedal 10 first drives the first central control wheel shaft 13 to rotate 30° through the first foot pedal connecting rod 12. The first central control wheel shaft 13 drives the first central control wheel connecting rod 16 to move through the first central control wheel connecting plate 15. The first central control wheel connecting rod 16 drives the first central control wheel adjusting rod 18 to rotate through the first central control wheel connecting plate 2 17. The rotation of the first central control wheel adjusting rod 18 drives the first gear lever to move, thereby adjusting the gear of the first central control caster assembly 3.

[0036] Example 3

[0037] Based on Example 2, such as Figure 2 As shown, the second gear shifting locking mechanism 8 includes a second foot pedal 11, which is mounted on a second foot pedal connecting rod 19. The end of the second foot pedal connecting rod 19 near the trolley base 1 is connected to the second central control wheel shaft 20. The two ends of the second central control wheel shaft 20 are rotatably connected to two second bearing seats, which are set on the trolley base 1. The end of the second central control wheel shaft 20 near the second central control caster assembly 4 is connected to the second central control caster assembly 4, the third central control caster assembly 5, and the fourth central control caster assembly 6 through a second transmission assembly.

[0038] The second transmission assembly includes a second central control wheel connecting plate 21. One end of the second central control wheel connecting plate 21 is connected to the end of the second central control wheel shaft 20 away from the second foot pedal connecting rod 19. The other end of the second central control wheel connecting plate 21 is hinged to the second central control wheel connecting rod 22. The end of the second central control wheel connecting rod 22 near the second central control caster assembly 4 is hinged to one end of the second central control wheel connecting plate 23. The other end of the second central control wheel connecting plate 23 is connected to one end of the second central control wheel adjusting rod 24. The other end of the second central control wheel adjusting rod 24 is connected to the second stop lever of the second central control caster assembly 4. The second central control wheel adjusting rod 24 is rotatably connected to the upper end of the second support seat. The second support seat is fixedly connected to the trolley base 1. The end of the second central control wheel connecting rod 22 near the third central control caster assembly 5 is hinged to the second central control wheel connecting plate 23. One end of the control wheel connecting plate 3 25 is hinged, the other end of the second control wheel connecting plate 3 25 is connected to one end of the third control wheel adjusting rod 26, the other end of the third control wheel adjusting rod 26 is connected to the third stop lever of the third control caster assembly 5, the third control wheel adjusting rod 26 is rotatably connected to the upper end of the third support seat, the third support seat is fixedly connected to the trolley base 1, the end of the third control wheel adjusting rod 26 away from the third control caster assembly 5 is fixedly connected to one end of the second control wheel connecting rod 27, the other end of the second control wheel connecting rod 27 is fixedly connected to one end of the fourth control wheel adjusting rod 28, the other end of the fourth control wheel adjusting rod 28 is connected to the fourth stop lever of the fourth control caster assembly 6, the fourth control wheel adjusting rod 28 is rotatably connected to the upper end of the fourth support seat, and the fourth support seat is fixedly connected to the trolley base 1.

[0039] The working principle and beneficial effects of the above technical solution are as follows: When the second gear shifting locking mechanism 8 is working, the foot pedal 11 is pressed down. The foot pedal 11 first drives the second central control wheel shaft 20 to rotate 30° through the second foot pedal connecting rod 19. The second central control wheel shaft 20 drives the second central control wheel connecting rod 22 to move through the second central control wheel connecting plate 21. The front and rear ends of the second central control wheel connecting rod 22 drive the second central control wheel connecting plate 23 and the second central control wheel connecting plate 25 to move respectively. The second central control wheel connecting plate 23 drives the second central control wheel connecting plate 23 to move through the second central control wheel connecting plate 25. The wheel adjusting rod 24 drives the second gear lever to rotate, and the second central control wheel connecting plate 25 drives the third gear lever to rotate through the third central control wheel adjusting rod 26, and drives the fourth central control wheel adjusting rod 28 to rotate through the second central control wheel connecting rod 27. The fourth central control wheel adjusting rod 28 drives the fourth gear lever to move, thereby realizing the synchronous adjustment of the gear positions of the second central control caster assembly 4, the third central control caster assembly 5 and the fourth central control caster assembly 6, and the gear positions of the second central control caster assembly 4, the third central control caster assembly 5 and the fourth central control caster assembly 6 are consistent.

[0040] Example 4

[0041] Based on any one of Examples 1-3, such as Figures 3-6As shown, the reset and unlocking mechanism 9 includes a locking component, an unlocking component, and a first unlocking link bracket 29 located between the first foot pedal link 12 and the second foot pedal link 19. The first unlocking link bracket 29 is fixedly connected to the trolley base 1. Lock holes 30 are provided at the end of the first foot pedal link 12 near the first central control wheel shaft 13 and the end of the second foot pedal link 19 near the second central control wheel shaft 20. Unlocking rods 31 are symmetrically arranged on the left and right sides of the first unlocking link bracket 29. The end of the unlocking rod 31 away from the first unlocking link bracket 29 passes through the lock hole 30 and is connected to the second unlocking link bracket 32. The second unlocking link bracket 32 ​​is fixedly connected to the trolley base 1. A locking component is provided on the unlocking rod 31. The locking component is used to lock the first foot pedal link 12 and the second foot pedal link 19, and the unlocking component is used to unlock the locked first foot pedal link 12 and the second foot pedal link 19.

[0042] The locking assembly includes a reset lock block 33 slidably disposed on the unlocking rod 31. The reset lock block 33 is adapted to the lock hole 30. A first unlocking spring 34 is disposed on the side of the reset lock block 33 near the first unlocking link bracket 29. An unlocking base plate 35 is disposed on the side of the first unlocking spring 34 near the first unlocking link bracket 29. The unlocking base plate 35 is slidably connected to the unlocking rod 31. A first inclined surface is disposed on the side of the unlocking base plate 35 near the first unlocking link bracket 29. A second unlocking spring 36 is disposed on the side of the reset lock block 33 near the second unlocking link bracket 32. Both the first unlocking spring 34 and the second unlocking spring 36 are sleeved on the unlocking rod 31.

[0043] The reset lock block 33 is stepped. The end of the reset lock block 33 near the first unlocking link bracket 29 is set as the first shaft platform 37. The first shaft platform 37 is connected to the second shaft platform 39 through the transition shaft 38. The diameter of the first shaft platform 37 is smaller than the diameter of the second shaft platform 39. The lock hole 30 is provided with the first hole 40, the transition hole 41 and the second hole 42 connected from bottom to top. The inner wall of the first hole 40 is adapted to the outer wall of the first shaft platform 37. The inner wall of the transition hole 41 is adapted to the outer diameter of the transition shaft 38. The inner wall of the second hole 42 is adapted to the outer wall of the second shaft platform 39.

[0044] The unlocking assembly includes several reset torsion springs 43 and several reset foot support rods 44 disposed above the first unlocking linkage bracket 29. The lower end of the reset foot support rod 44 is connected to the trolley base 1. The reset foot support rod 44 is a telescopic rod. A reset support rod spring 45 is sleeved on the outside of the reset foot support rod 44. The upper end of the reset foot support rod 44 is connected to the inner wall of the reset foot pedal 46. Unlocking upper plates 47 are symmetrically arranged on the inner walls of the left and right sides of the reset foot pedal 46. The unlocking upper plates 47 are located above the unlocking base plate 35. The unlocking upper plates 47 are symmetrically arranged on the front and rear sides. Unlocking plate 48, the lower end of unlocking plate 48 extends above unlocking base plate 35 and is provided with a second inclined surface, the second inclined surface is adapted to the first inclined surface, a number of reset torsion springs 43 are respectively sleeved on the first central control wheel shaft 13 and the second central control wheel shaft 20, one end of the reset torsion spring 43 sleeved on the first central control wheel shaft 13 is connected to the first central control wheel shaft 13, and the other end is connected to the first foot pedal connecting rod 12, one end of the reset torsion spring 43 sleeved on the first central control wheel shaft 20 is connected to the second central control wheel shaft 20, and the other end is connected to the second foot pedal connecting rod 19.

[0045] The working principle and beneficial effects of the above technical solution are as follows: When the foot pedal 10 is pressed, the first gear shifting locking mechanism 7 will be linked, thereby driving the first shaft 37, the second shaft 39, and the transition shaft 38 between them of the reset lock block 33 to rotate within the lock hole 30, thereby realizing the gear shifting function; at the same time, the second unlocking spring 36 on the right side of the reset lock block 33 is initially in a compressed state, the first shaft 37 gradually slides in the first hole 40 to the transition hole 41, and then as the foot pedal 10 is continued to be pressed, the reset lock block 33 continues to slide along the lock hole 30. When the second shaft 39 slides to the position of the second hole 42 of the lock hole 30, the second unlocking spring 36 has a rebound space, and the second unlocking spring 36 can push the reset lock block 33 to slide along the unlocking rod 31, and the second shaft of the reset lock block 33... 39 slides into the second hole 42, and the reset locking block 33 is pressed close to the first unlocking spring 34 of the first unlocking linkage bracket 29. At this time, the range of motion of the reset locking block 33 is restricted. By controlling the tolerance between each shaft segment of the reset locking block 33 and the lock hole 30, the shaking of the second gear switching locking mechanism 8 in the fixed locking state is realized. The smaller the gap, the smaller the shaking, thereby realizing the locking function after gear switching. The reset unlocking mechanism 9 of the present invention relies on the elastic force of the first unlocking spring 34 and the second unlocking spring 36 to move the reset locking block 33 left and right to complete the locking. At this time, when the foot pedal 10 is pressed down alone, the first central control caster assembly 3 is in a directional state. At this time, regardless of the state of the second central control caster assembly 4, the third central control caster assembly 5 and the fourth central control caster assembly 6, the equipment trolley can only move forward or backward in a directional manner.

[0046] Similarly, the remaining three second central control caster assemblies 4, 5, and 6 are connected as a group via the second gear shifting locking mechanism 8. Since the second foot pedal 11 is fixed to the second foot pedal linkage 19, when the second foot pedal 11 is stepped on, the second foot pedal 11 simultaneously drives the second central control caster assembly 4, 5, and 6 to rotate downwards via the second gear shifting locking mechanism 8. When the foot pedal 11 is pressed, the second gear shifting locking mechanism 8 is activated, which in turn drives the first shaft 37, the second shaft 39, and the transition shaft 38 of the reset lock block 33 to rotate within the lock hole 30, thereby realizing the gear shifting function. Simultaneously, the second unlocking spring 36 of the reset lock block 33 is initially compressed near the second unlocking linkage bracket 32. The first shaft 37 gradually slides from the first hole 40 to the transition hole 41. Then, as the foot pedal 11 continues to be pressed, the reset lock block 33 continues to slide along the lock hole 30. When the second shaft 39 slides to the second hole 42 of the lock hole 30, the second unlocking spring 36 has room to rebound. The second unlocking spring 36 can then push against the reset lock block 33 and slide along the unlocking rod 31. The second shaft 39 of the reset lock block 33 slides to the second... Inside the hole 42, the reset locking block 33 is pressed close to the first unlocking spring 34 of the first unlocking linkage bracket 29. At this time, the range of motion of the reset locking block 33 is restricted. By controlling the tolerance between each shaft segment of the reset locking block 33 and the lock hole 30, the shaking of the second gear switching locking mechanism 8 in the fixed locking state is realized. The smaller the gap, the smaller the shaking, thereby realizing the locking function after gear switching. The reset unlocking mechanism 9 of the present invention relies on the elastic force of the first unlocking spring 34 and the second unlocking spring 36 to move the reset locking block 33 left and right to complete the locking. At this time, when the foot pedal 11 is pressed down alone, the second central control caster assembly 4, the third central control caster assembly 5 and the fourth central control caster assembly 6 of the second group are in the locked state, while the equipment trolley remains locked regardless of the state of the first central control caster assembly 3 of the single group.

[0047] When the reset unlocking mechanism 9 is unlocking (this includes the following situations: a. the left second gear switching locking mechanism 8 completes the locking function; b. the right first gear switching locking mechanism 7 completes the locking function; c. the left and right second gear switching locking mechanisms 8 and first gear switching locking mechanism 7 complete the locking function simultaneously; only one of these situations is used as an example for the invention's unlocking description), pressing the reset foot pedal 46 triggers the reset unlocking mechanism 9. Specifically, when the reset foot pedal 46 is pressed down, the reset foot pedal 46 drives the unlocking upper plate 47 to move downwards, and the unlocking upper plate 47 drives the unlocking plate 48 to move downwards. The distance between the second inclined surface of the unlocking plate 48 and the first inclined surface of the unlocking base plate 35 becomes smaller and smaller. Because the position of the unlocking upper plate 47 is fixed, it only has vertical displacement. After the second inclined surface contacts the first inclined surface, the unlocking upper plate 47 continues to move downwards. The unlocking plate 48, through the contact between the second inclined surface and the first inclined surface, can drive the unlocking base plate 35 to move along the unlocking rod 31 towards the unlocking plate 31. The movement of the second unlocking linkage bracket 32 ​​causes the unlocking base plates 35 on both sides of the first unlocking linkage bracket 29 to move synchronously towards the second unlocking linkage bracket 32. This causes the reset locking block 33 to slide towards the second unlocking linkage bracket 32, separating the second axle 39 of the reset locking block 33 from the inner wall of the second hole 42. The second unlocking spring 36 is then compressed again, causing the first axle 37 of the reset locking block 33 to re-enter the lock hole 30 and slide along the inner wall of the lock hole 30. This allows the first foot pedal linkage 12 and the second foot pedal linkage 19 to return to their original positions under the force of the reset torsion spring 43. Foot pedal 10 and foot pedal 2 11 also return to their original positions for subsequent use. The torque value of the reset torsion spring 43 is greater than the value for switching from full lock to full free and from directional to full free. This causes the gear to automatically switch from full lock to full free or from directional to full free, lifting the gear position of the central control caster and thus completing the gear unlocking function. The selection of the reset torsion spring 43 for the reset and unlocking mechanism 9 of this gear position should comprehensively consider parameters such as the torsion spring's torque. Based on the three-gear, three-function central control caster selected in this invention, the torque required for switching the relevant gear positions is as follows: from fully free to fully locked, the torque value is 5.5 Nm; from fully locked to fully free, the torque value is 4.3 Nm; from fully free to directional, the torque value is 1.8 Nm; from directional to fully free, the torque value is 2.6 Nm.

[0048] In this invention, the foot pedal system solves the problems of stiff gear shifting and uneven gear shifting force through the reset torsion spring 43, and also achieves buffering and shock absorption functions; the reset unlocking mechanism 9 enables the foot pedal unlocking function; since the reset locking block 33 acts as a limit, it prevents axial movement of the first central control wheel shaft 13 and the second central control wheel shaft 20, improving the reliability of the mechanism and avoiding damage to the central control caster due to axial movement of each shaft; by having the central control caster lever installed in opposite directions, all three functions are realized when controlling the central control caster in the same direction; the elastic force of the first unlocking spring 34 and the second unlocking spring 36 in the reset unlocking mechanism 9 causes the reset locking block 33 to move along the unlocking rod 31. The mechanism is activated to lock and unlock. The wobbling of the first gear switching locking mechanism 7 and the second gear switching locking mechanism 8 in the fixed locking state is controlled by adjusting the shaft diameter of the reset locking block 33 and the tolerance of the lock hole 30. The smaller the gap, the less the wobbling. The torque value of the reset torsion spring 43 is greater than that for switching from full lock to full free and from directional to full free. This will cause the gear to automatically switch from full lock to full free or from directional to full free. The reset torsion spring 43 has a sufficiently strong reset locking block 33 to support and limit the rebound upward force of the first foot pedal linkage 12 and the second foot pedal linkage 19, thereby improving the reliability and safety performance of the mechanism.

[0049] This invention can be applied not only to medical ultrasound trolleys, but also to various medical trolleys, as well as to the three-speed three-function, three-speed two-function, and two-speed two-function central control caster foot pedal locking and unlocking functions of trolleys and carts in various fields and industries. Therefore, this invention is not limited to use in medical equipment; it can also be used in trolleys and carts in various fields and industries. And different combinations of center control casters, such as: one set on the left, one front and one rear center control caster (fully free to fully locked), and one set on the right, one front and one rear center control caster (fully free to fixed); one set on the left, one front and one rear center control caster (fully free to fixed), and one set on the right, one front and one rear center control caster (fully free to fully locked); one set on the left, one front left, one rear left, and one rear right center control caster (fully free to fully locked), and one set on the right, one front right center control caster (fully free to fixed); one set on the left, one front right center control caster (fully free to fixed), and one set on the right, one front left, one rear left, and one rear right center control caster (fully free to fully locked).

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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, they should not be construed as limitations on this invention.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A foot pedal system with a reset button, characterized in that, include: A trolley base (1) is provided with a base plate (2). The four corners of the bottom of the trolley base (1) are provided with a first central control caster assembly (3), a second central control caster assembly (4), a third central control caster assembly (5), and a fourth central control caster assembly (6). The first central control caster assembly (3), the second central control caster assembly (4), the third central control caster assembly (5), and the fourth central control caster assembly (6) are all fixed to the trolley base (1) by the base plate (2). The trolley base (1) is provided with a first gear shifting locking mechanism (7), a second gear shifting locking mechanism (8), and a reset unlocking mechanism. (9) The first gear shifting locking mechanism (7) is connected to the first central control caster assembly (3) and controls the first central control caster assembly (3) to perform gear shifting through the foot pedal one (10). The second gear shifting locking mechanism (8) is connected to the second central control caster assembly (4), the third central control caster assembly (5) and the fourth central control caster assembly (6) and controls the second central control caster assembly (4), the third central control caster assembly (5) and the fourth central control caster assembly (6) to perform gear shifting through the foot pedal two (11). The reset unlocking mechanism (9) is used to control the foot pedal one (10) and the foot pedal two (11) to reset and unlock. The first gear shifting locking mechanism (7) includes a foot pedal (10), which is mounted on a first foot pedal link (12). The first foot pedal link (12) is connected to the first central control wheel shaft (13) at one end near the trolley base (1). The two ends of the first central control wheel shaft (13) are rotatably connected to two first bearing seats (14). The two first bearing seats (14) are set on the trolley base (1). The first central control wheel shaft (13) is connected to the first central control caster assembly (3) at one end near the first central control caster assembly (3) through a first transmission assembly. The second gear shifting locking mechanism (8) includes a second foot pedal (11), which is mounted on a second foot pedal link (19). The second foot pedal link (19) is connected to the second central control wheel shaft (20) at one end near the trolley base (1). The two ends of the second central control wheel shaft (20) are rotatably connected to two second bearing seats respectively. The two second bearing seats are set on the trolley base (1). The second central control wheel shaft (20) is connected to the second central control wheel assembly (4), the third central control wheel assembly (5), and the fourth central control wheel assembly (6) through a second transmission assembly at one end near the second central control caster assembly (4). The reset and unlocking mechanism (9) includes a locking component, an unlocking component, and a first unlocking link bracket (29) located between the first foot pedal link (12) and the second foot pedal link (19). The first unlocking link bracket (29) is fixedly connected to the trolley base (1). Lock holes (30) are provided at the end of the first foot pedal link (12) near the first central control wheel shaft (13) and the end of the second foot pedal link (19) near the second central control wheel shaft (20). The first unlocking link bracket (29) has lock holes (30) on both sides. An unlocking rod (31) is symmetrically arranged. The end of the unlocking rod (31) away from the first unlocking link bracket (29) passes through the lock hole (30) and is connected to the second unlocking link bracket (32). The second unlocking link bracket (32) is fixedly connected to the trolley base (1). A locking component is provided on the unlocking rod (31). The locking component is used to lock the first foot pedal link (12) and the second foot pedal link (19). The unlocking component is used to unlock the locked first foot pedal link (12) and the second foot pedal link (19).

2. The foot pedal system with a reset button according to claim 1, characterized in that, The first transmission assembly includes a first central control wheel connecting plate (15), one end of which is connected to the end of the first central control wheel shaft (13) away from the first foot pedal connecting rod (12), the other end of which is hinged to one end of the first central control wheel connecting rod (16), the other end of which is hinged to one end of the first central control wheel connecting rod (16), the other end of which is hinged to one end of the first central control wheel connecting plate (17), the other end of which is connected to one end of the first central control wheel adjusting rod (18), the other end of which is connected to the first stop lever of the first central control caster assembly (3), the first central control wheel adjusting rod (18) is rotatably connected to the upper end of the first support seat, and the first support seat is fixedly connected to the trolley base (1).

3. A foot pedal system with a reset button according to claim 1, characterized in that, The second transmission assembly includes a second central control wheel connecting plate one (21), one end of which is connected to the end of the second central control wheel shaft (20) away from the second foot pedal connecting rod (19), and the other end of which is hinged to the second central control wheel connecting rod one (22). The end of the second central control wheel connecting rod one (22) near the second central control caster assembly (4) is hinged to one end of the second central control wheel connecting plate two (23), and the other end of the second central control wheel connecting plate two (23) is connected to one end of the second central control wheel adjusting rod (24). The other end of the second central control wheel adjusting rod (24) is connected to the second stop lever of the second central control caster assembly (4). The second central control wheel adjusting rod (24) is rotatably connected to the upper end of the second support seat. The second support seat is fixedly connected to the trolley base (1). The end of the second central control wheel connecting rod one (22) near the third central control caster assembly (5) is hinged to the second foot pedal connecting rod two (23). One end of the central control wheel connecting plate three (25) is hinged, the other end of the second central control wheel connecting plate three (25) is connected to one end of the third central control wheel adjusting rod (26), the other end of the third central control wheel adjusting rod (26) is connected to the third stop of the third central control caster assembly (5), the third central control wheel adjusting rod (26) is rotatably connected to the upper end of the third support seat, the third support seat is fixedly connected to the trolley base (1), the end of the third central control wheel adjusting rod (26) away from the third central control caster assembly (5) is fixedly connected to one end of the second central control wheel connecting rod two (27), the other end of the second central control wheel connecting rod two (27) is fixedly connected to one end of the fourth central control wheel adjusting rod (28), the other end of the fourth central control wheel adjusting rod (28) is connected to the fourth stop of the fourth central control caster assembly (6), the fourth central control wheel adjusting rod (28) is rotatably connected to the upper end of the fourth support seat, and the fourth support seat is fixedly connected to the trolley base (1).

4. A foot pedal system with a reset button according to claim 1, characterized in that, The gear sequence of the second central control caster assembly (4), the third central control caster assembly (5) and the fourth central control caster assembly (6) is the same and different from that of the first central control caster assembly (3).

5. A foot pedal system with a reset button according to claim 1, characterized in that, The locking assembly includes a reset lock block (33) slidably disposed on the unlocking rod (31). The reset lock block (33) is adapted to the lock hole (30). A first unlocking spring (34) is disposed on the side of the reset lock block (33) near the first unlocking linkage bracket (29). An unlocking base plate (35) is disposed on the side of the first unlocking linkage bracket (29). The unlocking base plate (35) is slidably connected to the unlocking rod (31) from left to right. A first inclined surface is disposed on the side of the unlocking base plate (35) near the first unlocking linkage bracket (29). A second unlocking spring (36) is disposed on the side of the reset lock block (33) near the second unlocking linkage bracket (32). Both the first unlocking spring (34) and the second unlocking spring (36) are sleeved on the unlocking rod (31).

6. A foot pedal system with a reset button according to claim 5, characterized in that, The reset lock block (33) is stepped. The end of the reset lock block (33) near the first unlocking link bracket (29) is set as the first shaft platform (37). The first shaft platform (37) is connected to the second shaft platform (39) through the transition shaft (38). The diameter of the first shaft platform (37) is smaller than the diameter of the second shaft platform (39). The lock hole (30) is connected from bottom to top to the first hole (40), the transition hole (41) and the second hole (42). The inner wall of the first hole (40) is adapted to the outer wall of the first shaft platform (37). The inner wall of the transition hole (41) is adapted to the outer diameter of the transition shaft (38). The inner wall of the second hole (42) is adapted to the outer wall of the second shaft platform (39).

7. A foot pedal system with a reset button according to claim 6, characterized in that, The unlocking assembly includes several reset torsion springs (43) and several reset foot support rods (44) set above the first unlocking linkage bracket (29). The lower end of the reset foot support rod (44) is connected to the trolley base (1). The reset foot support rod (44) is a telescopic rod. A reset support rod spring (45) is sleeved on the outside of the reset foot support rod (44). The upper end of the reset foot support rod (44) is connected to the inner wall of the reset foot pedal (46). The reset foot pedal (46) is symmetrically provided with unlocking upper plates (47) on the left and right inner walls. The unlocking upper plates (47) are located above the unlocking base plate (35). The front and rear sides of the unlocking upper plates (47) are symmetrical. An unlocking plate (48) is provided, the lower end of which extends above the unlocking base plate (35) and is provided with a second inclined surface. The second inclined surface is adapted to the first inclined surface. Several reset torsion springs (43) are respectively sleeved on the first central control wheel shaft (13) and the second central control wheel shaft (20). One end of the reset torsion spring (43) sleeved on the first central control wheel shaft (13) is connected to the first central control wheel shaft (13), and the other end is connected to the first foot pedal connecting rod (12). One end of the reset torsion spring (43) sleeved on the second central control wheel shaft (20) is connected to the second central control wheel shaft (20), and the other end is connected to the second foot pedal connecting rod (19).

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