Pedal connecting rod linkage mechanism

Abstract

The utility model relates to a pedal connecting rod linkage mechanism which is installed on a lower bed frame of a medical bed. The front wheel assembly and the rear wheel assembly are arranged at the front end and the rear end of a lower bed frame respectively and are of the same structure, the linkage control assembly is used for connecting the front wheel assembly and the rear wheel assembly, the pedal assembly is arranged on the rear wheel assembly, and the limiting piece is arranged below the lower bed frame. The front wheel assembly comprises two lifting trundles which are symmetrically arranged, a connecting rod which is rotationally arranged between the two lifting trundles and two jacking pieces which are arranged on the connecting rod in a spaced mode, and each lifting trundle is vertically connected to the lower bed frame in a sliding mode up and down; the linkage control assembly is of a three-section plate body structure which is hinged to one another. The number of the limiting pieces is four, the limiting pieces correspond to the jacking pieces in a one-to-one mode, and the jacking pieces abut against the lower portions of the limiting pieces. When the medical bed needs to be moved, the trundles can be quickly unlocked at the same time, and the medical bed can be quickly transferred.

Description

Technical Field

[0001] The utility model relates to the technical field of rehabilitation medical equipment, in particular to a pedal connecting rod linkage mechanism. Background Art

[0002] Existing mobile rehabilitation beds, such as multi-position treatment beds, upright beds, and physical therapy beds, all have casters that allow them to be moved. Once the bed reaches a designated position, the casters are locked to prevent further movement. Since there are typically four casters, locking them requires braking each one around the bed, and unlocking them requires the reverse process. This results in a cumbersome and time-consuming process for locking and unlocking the casters, making it impossible to control all the casters simultaneously, which in turn affects the ease of movement of the bed. Summary of the Invention

[0003] In order to solve the problem that multiple casters on existing medical beds are difficult to control simultaneously, the utility model provides a pedal connecting rod linkage mechanism. The mechanism is arranged on the lower bed frame of the medical bed, which can control the unlocking and locking of multiple casters at the same time, making the operation more convenient and realizing the rapid movement of the medical bed.

[0004] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0005] A pedal linkage mechanism is installed on the lower bed frame of a medical bed, comprising a front wheel assembly and a rear wheel assembly of the same structure, respectively arranged at the front and rear ends of the lower bed frame, a linkage control assembly for connecting the front wheel assembly and the rear wheel assembly, a pedal assembly arranged on the rear wheel assembly, and a limit member arranged below the lower bed frame;

[0006] The front wheel assembly includes two symmetrically arranged lifting casters, a connecting rod rotatably arranged between the two lifting casters, and two lifting members spaced apart on the connecting rod. Each of the lifting casters is vertically slidably connected to the lower bed frame to facilitate relative movement with the lower bed frame.

[0007] The linkage control assembly is a three-section plate structure hinged to each other, which is equivalent to a four-bar linkage mechanism. The two ends of the linkage control assembly are respectively fixedly connected to the connecting rods on the front wheel assembly and the rear wheel assembly, which facilitates the linkage control of the front wheel assembly and the rear wheel assembly; the pedal assembly is provided on the connecting rod of the rear wheel assembly to facilitate the control of the rotation of the connecting rod; the number of the limiting members is four and arranged in a rectangular shape, each limiting member corresponds to the lifting member one by one, and the lifting member is tightly pressed against the bottom of the limiting member.

[0008] Furthermore, the lower bed frame includes a lower cross frame and lower longitudinal beams. The lower cross frame is a portal frame, and the number of lower cross frames is two, arranged at intervals. Two lower longitudinal beams are provided between the two lower cross frames, facilitating the connection and fixation of the lower cross frames and enhancing the stability of the entire lower bed frame.

[0009] Furthermore, the front wheel assembly and the rear wheel assembly are respectively arranged on the two lower cross frames. The two lifting casters are symmetrically arranged at both ends of the lower cross frame, ensuring that the lifting casters are evenly arranged on the lower bed frame. The lifting caster includes a lifting straight rod, a limit cap, and a caster body.

[0010] Furthermore, the lifting straight rod is vertically inserted through the end of the lower cross frame, and the lifting straight rod is in sliding connection with the lower cross frame. The upper and lower ends of the lifting straight rod respectively extend out of the lower cross frame and are connected with the limit cap and the caster body; the end of the connecting rod is inserted through the lifting straight rods of the two lifting casters and is rotatably connected with the lifting straight rod. When the connecting rod rotates, the lifting straight rod does not rotate along with it and still remains upright.

[0011] Furthermore, the linkage control component is arranged parallel to the lower longitudinal beam. The linkage control component includes a rotating plate and a connecting plate. The length of the connecting plate is greater than that of the rotating plate. The connecting plate is arranged parallel above the lower longitudinal beam, and both ends of the connecting plate are hinged with the rotating plate. After the two rotating plates are bent, they are respectively fixedly connected to the connecting rods on the front wheel assembly and the rear wheel assembly. The linkage control component facilitates the connection of the two connecting rods and realizes the linkage control between the connecting rods.

[0012] Furthermore, the foot pedal component includes a foot pedal and a foot pedal tube. One end of the foot pedal is arranged on the connecting rod, and the other end of the foot pedal is provided with the foot pedal tube. The cross-section of the foot pedal and the foot pedal tube in combination is in an L shape; one end of the foot pedal tube is connected to the rotating plate, and the cross-section of the foot pedal component and the rotating plate in combination is in a U shape, increasing the structural strength of the installation of the foot pedal component.

[0013] Furthermore, the limiting members are arranged below both ends of each lower cross frame. The limiting member includes a limiting plate, a limiting bolt, and a limiting ring. The limiting plate is connected to the lower cross frame through the limiting bolt, and the limiting ring is sleeved on the limiting bolt. Both the limiting ring and the head of the limiting bolt protrude from the lower plane of the limiting plate, aiming to limit the swing of the jacking member;

[0014] The jacking member is arranged below the limiting member. The jacking member includes a cam plate and a jacking shaft. Both ends of the cam plate are respectively connected with a connecting rod and the jacking shaft. The jacking shaft is arranged parallel to the connecting rod, and the jacking shaft abuts between the limiting plate and the limiting ring.

[0015] Through the above technical solutions, the beneficial effects of the present utility model are:

[0016] This utility model features a rational structural design, acting as a mechanism controlling the linkage of hinged connecting rods, which are linked end to end. During this linkage, the connecting rods' head and tail are each displaced along a defined trajectory and by a defined amplitude. This allows the casters to be quickly and simultaneously unlocked when the medical bed needs to be moved, enabling rapid transfer of the equipment and improving the ease of movement.

[0017] The utility model has front and rear wheel assemblies of identical structure arranged at the front and rear ends of the lower bed frame, respectively. Both the front and rear wheel assemblies can be raised and lowered relative to the lower bed frame. The rear wheel assembly is equipped with a footrest assembly. The footrest assembly, in conjunction with a lifting member and a stopper, can drive the rear wheel assembly up and down. A linkage control assembly connects the front and rear wheel assemblies, allowing the front wheel assembly to move up and down synchronously.

[0018] When the lower bed frame contacts the ground, the four lifting casters are locked, preventing them from moving. By pressing the foot pedal assembly downward, the four lifting members are synchronously controlled to swing upward under the action of the linkage control assembly. The lifting members cooperate with the limiters to lift the lower bed frame upward, suspending it off the ground. Only the lifting casters are in contact with the ground, unlocking the lifting casters and allowing for quick movement of the medical bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the axonometric drawings of a pedal connecting rod linkage mechanism of the present invention, in which the lower bed frame is in a movable state.

[0020] Figure 2 This is the second axonometric drawing of a pedal connecting rod linkage mechanism of the present invention, in which the lower bed frame is in a movable state.

[0021] Figure 3 The utility model is a schematic diagram of the installation of a front wheel assembly, a rear wheel assembly and a linkage control assembly of a pedal connecting rod linkage mechanism.

[0022] Figure 4 This is a new type of pedal connecting rod linkage mechanism Figure 3 A disconnected view of the .

[0023] Figure 5 It is a bottom view of a pedal connecting rod linkage mechanism of the utility model.

[0024] Figure 6 This is a new type of pedal connecting rod linkage mechanism Figure 5 A partial enlarged schematic diagram is shown in the figure.

[0025] The numbers in the accompanying drawings are: 1 lower bed frame, 11 lower cross frame, 111 support leg, 12 lower longitudinal beam, 2 front wheel assembly, 3 rear wheel assembly, 4 linkage control assembly, 41 rotating plate, 42 connecting plate, 5 foot pedal assembly, 51 foot pedal, 52 foot pedal tube, 6 limit member, 61 limit plate, 62 limit bolt, 63 limit ring, 7 lifting caster, 71 lifting straight rod, 72 limit cap, 73 caster body, 8 connecting rod, 9 lifting member, 91 cam plate, 92 lifting shaft. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings:

[0027] like Figures 1 to 6 As shown, a foot-operated connecting rod linkage mechanism is installed on the lower bed frame 1 of the medical bed. The lower bed frame 1 includes a lower cross frame 11 and a lower longitudinal beam 12. The lower cross frame 11 is a door-shaped frame, that is, the two ends of the lower cross frame 11 are bent vertically downward to form support legs 111. There are two lower cross frames 11 arranged at intervals. Two lower longitudinal beams 12 are provided between the two lower cross frames 11, and the two lower cross frames 11 are firmly connected and fixed together by the lower longitudinal beams 12.

[0028] The pedal linkage mechanism includes a front wheel assembly 2 and a rear wheel assembly 3 with the same structure, which are respectively arranged at the front and rear ends of the lower bed frame 1, a linkage control assembly 4 for connecting the front wheel assembly 2 and the rear wheel assembly 3, a pedal assembly 5 arranged on the rear wheel assembly 3, and a limit member 6 arranged under the lower bed frame 1.

[0029] When the front wheel assembly 2 and the rear wheel assembly 3 are installed, the lower cross frame 11 can be regarded as the front and rear ends of the lower bed frame 1. The front wheel assembly 2 and the rear wheel assembly 3 are respectively arranged on the two lower cross frames 11. The front wheel assembly 2 and the rear wheel assembly 3 are located between the two ends of the lower cross frame 11, and their length does not exceed the length of the lower cross frame 11.

[0030] In this embodiment, the front wheel assembly 2 includes two symmetrically arranged lifting casters 7, a connecting rod 8 rotatably disposed between the two lifting casters 7, and two lifting members 9 spaced apart on the connecting rod 8. Each lifting caster 7 is vertically slidably connected to the lower bed frame 1, allowing the lifting casters 7 to move up and down relative to the lower bed frame 1. During installation, the two lifting casters 7 are symmetrically arranged at opposite ends of the lower cross frame 11 and spaced a certain distance from the end of the lower cross frame 11, so that the legs 111 do not interfere with the installation of the lifting casters 7.

[0031] The lifting caster 7 includes a lifting rod 71, a limiting cap 72 and a caster body 73. The lifting rod 71 is slidably connected to the lower cross frame 11, and the lifting rod 71 is vertically inserted into the end of the lower cross frame 11. The lifting rod 71 and the support legs 111 are arranged in parallel. The upper and lower ends of the lifting rod 71 extend out of the lower cross frame 11 to connect the limiting cap 72 and the caster body 73. The limiting cap 72 is a nut. The limiting cap 72 and the lifting rod 71 are threadedly connected. Under the action of the limiting cap 72 and the caster body 73, the lifting rod 71 can be prevented from detaching from the lower cross frame 11. The rear wheel assembly 3 also has the above structure. The installation method of the rear wheel assembly 3 and the lower cross frame 11 is the same as the installation method of the front wheel assembly 2, which will not be repeated here.

[0032] The connecting rod 8 is a cylindrical rod, arranged perpendicular to the lifting rod 71, and located below the lower cross frame 11. The length of the connecting rod 8 is less than the distance between the legs 111 at both ends of the lower cross frame 11. When the connecting rod 8 is installed, the end of the connecting rod 8 is inserted into the lifting rod 71 of the two lifting casters 7 and is rotatably connected to the lifting rod 71. Therefore, the connecting rod 8 can rotate independently, and the up and down movement of the connecting rod 8 can simultaneously drive the two lifting casters 7 up and down.

[0033] Lifting member 9 can be considered a protrusion on connecting rod 8, and it rotates with connecting rod 8. Lifting member 9 comprises a cam plate 91 and a lifting shaft 92. Cam plate 91 has a large-diameter end and a small-diameter end. Connecting rod 8 and lifting shaft 92 are connected to each end of cam plate 91, respectively. Specifically, the large-diameter end of cam plate 91 is fixed to connecting rod 8, while the small-diameter end of cam plate 91 is fixed to lifting shaft 92. Lifting shaft 92 is arranged parallel to connecting rod 8. As connecting rod 8 rotates, lifting shaft 92 swings around connecting rod 8, with connecting rod 8 as the center of the circle.

[0034] To achieve coordinated control of the front wheel assembly 2 and the rear wheel assembly 3, a linkage control assembly 4 is employed. This linkage control assembly 4 can synchronously control the raising and lowering of the front wheel assembly 2 and the rear wheel assembly 3. The linkage control assembly 4 is arranged parallel to the lower longitudinal beam 12 and is a three-section plate structure that is hinged to each other. The linkage control assembly 4 is equivalent to a four-bar linkage.

[0035] Specifically, the linkage control assembly 4 includes a rotating plate 41 and a connecting plate 42. The connecting plate 42 is longer than the rotating plate 41 and is arranged parallel to and above the lower longitudinal beam 12. The rotating plates 41 are hingedly connected at both ends of the connecting plate 42. The linkage control assembly 4 is fixedly connected to the connecting rods 8 of the front wheel assembly 2 and the rear wheel assembly 3 at both ends. That is, the two rotating plates 41 are bent and fixedly connected to the connecting rods 8 of the front wheel assembly 2 and the rear wheel assembly 3, respectively. As a result, when the connecting rod 8 of the rear wheel assembly 3 rotates, the linkage control assembly 4 can drive the connecting rod 8 of the front wheel assembly 2 to rotate.

[0036] To realize the movement of the rear wheel assembly 3, a foot pedal assembly 5 is provided on the connecting rod 8 of the rear wheel assembly 3. The connecting rod 8 can be rotated by the foot pedal assembly 5. The foot pedal assembly 5 includes a foot pedal 51 and a foot pedal tube 52. The foot pedal 51 and the rotating plate 41 are arranged in parallel. One end of the foot pedal 51 is provided on the connecting rod 8, and the other end of the foot pedal 51 is provided with the foot pedal tube 52. After the foot pedal 51 and the foot pedal tube 52 are connected and combined, the cross-section is in the shape of "𠃊". One end of the foot pedal tube 52 is connected to the rotating plate 41. After the foot pedal assembly 5 and the rotating plate 41 are connected and combined, the cross-section is in the shape of "凵".

[0037] By stepping on the foot pedal assembly 5, the connecting rod 8 of the rear wheel assembly 3 can be directly controlled to rotate. Under the action of the linkage control assembly 4, the connecting rod 8 of the front wheel assembly 2 is synchronously driven to rotate, and then the lifting member 9 on the connecting rod 8 deflects. The lifting of the lower bed frame 1 can be controlled by the swing of the lifting member 9, that is, the lifting member 9 and the limiting member 6 cooperate to realize the lifting control of the lower bed frame 1.

[0038] The limiting members 6 are arranged at the corners below the lower bed frame 1. The number of the limiting members 6 is four arranged in a rectangle, that is, the limiting members 6 are arranged below both ends of each lower cross frame 11. Each limiting member 6 corresponds to the lifting member 9 one by one, and the lifting members 9 are arranged below the limiting members 6.

[0039] The limiting member 6 includes a limiting plate 61, a limiting bolt 62 and a limiting ring 63. The limiting plate 61 is connected to the lower cross frame 11 through the limiting bolt 62. The limiting ring 63 is sleeved on the limiting bolt 62. Both the limiting ring 63 and the head of the limiting bolt 62 protrude from the lower plane of the limiting plate 61. The head of the limiting bolt 62 is the hexagonal head of the limiting bolt 62. The lifting member 9 abuts against the lower part of the limiting member 6, that is, the lifting shaft 92 abuts between the limiting plate 61 and the limiting ring 63.

[0040] The principle of the present utility model is as follows: When the medical bed is fixed, the lower bed frame 1 contacts the ground. Under the gravity of the entire medical bed, the lower bed frame 1 cannot move. At this time, the lifting casters 7 contact the ground. If the lower bed frame 1 needs to be moved, at this time, step on the foot pedal assembly 5 to make the foot pedal assembly 5 turn downward. Under the action of the linkage control assembly 4, the connecting rods 8 in the front wheel assembly 2 and the rear wheel assembly 3 rotate clockwise at the same time, and then the four lifting members 9 swing upward at the same time.

[0041] When the lifting shaft 92 contacts the limit plate 61, continue to step down on the footrest assembly 5 until the lifting shaft 92 rests on the limit ring 63. Under the reaction force of the lower bed frame 1, and then through the force of the limit member 6, the lower bed frame 1 is forced to move up relative to the lifting caster 7 and leave the ground, and the lifting caster 7 is equivalent to moving down, thereby achieving the purpose of simultaneously unlocking the four lifting casters 7. The lifting casters 7 are in a free-moving state, and the lower bed frame 1 can be moved by the lifting casters 7, and then the entire medical bed can be moved. When the lower bed frame 1 needs to be fixed again, the footrest assembly 5 is swung upward in the opposite direction, and the lifting member 9 gradually separates from the limit member 6, and the lower bed frame 1 can fall to the ground, achieving the fixation of the entire medical bed.

[0042] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A pedal-link linkage mechanism, mounted on the lower bed frame (1) of a medical bed, characterized in that: It includes a front wheel assembly (2) and a rear wheel assembly (3) which are respectively arranged at the front and rear ends of the lower bed frame (1) and have the same structure, a linkage control assembly (4) for connecting the front wheel assembly (2) and the rear wheel assembly (3), a foot pedal assembly (5) arranged on the rear wheel assembly (3), and a limiting member (6) arranged below the lower bed frame (1); The front wheel assembly (2) includes two lifting casters (7) arranged symmetrically, a connecting rod (8) rotatably arranged between the two lifting casters (7), and two jacking members (9) arranged at intervals on the connecting rod (8). Each lifting caster (7) is vertically slidably connected to the lower bed frame (1); The linkage control assembly (4) is a three-section plate structure connected by hinges. The two ends of the linkage control assembly (4) are respectively fixedly connected to the connecting rods (8) on the front wheel assembly (2) and the rear wheel assembly (3); the foot pedal assembly (5) is arranged on the connecting rod (8) of the rear wheel assembly (3); the number of the limiting members (6) is four arranged in a rectangular pattern, and each limiting member (6) corresponds to one of the jacking members (9), and the jacking member (9) abuts against the lower side of the limiting member (6).

2. A pedal-link linkage mechanism according to claim 1, characterized in that: The lower bed frame (1) includes a lower cross frame (11) and lower longitudinal beams (12). The lower cross frame (11) is a portal frame, and the number of the lower cross frames (11) is two arranged at intervals. Two of the lower longitudinal beams (12) are arranged between the two lower cross frames (11).

3. A pedal connecting rod linkage mechanism according to claim 2, characterized in that: The front wheel assembly (2) and the rear wheel assembly (3) are respectively arranged on the two lower cross frames (11). The two lifting casters (7) are symmetrically arranged at the two ends of the lower cross frame (11). The lifting caster (7) includes a lifting straight rod (71), a limiting cap (72), and a caster body (73).

4. A pedal-link linkage mechanism according to claim 3, characterized in that: The lifting straight rod (71) is vertically penetrated through the end of the lower cross frame (11), and the lifting straight rod (71) is slidably connected to the lower cross frame (11). The upper and lower ends of the lifting straight rod (71) respectively extend out of the lower cross frame (11) and are connected with the limiting cap (72) and the caster body (73); the end of the connecting rod (8) is penetrated through the lifting straight rods (71) of the two lifting casters (7) and is rotatably connected to the lifting straight rod (71).

5. The pedal-link linkage mechanism according to claim 2, characterized in that: The linkage control assembly (4) is arranged parallel to the lower longitudinal beam (12). The linkage control assembly (4) includes a rotating plate (41) and a connecting plate (42). The length of the connecting plate (42) is greater than that of the rotating plate (41). The connecting plate (42) is arranged parallel to the upper side of the lower longitudinal beam (12). The two ends of the connecting plate (42) are hinged with the rotating plate (41), and the two rotating plates (41) are bent and respectively fixedly connected to the connecting rods (8) on the front wheel assembly (2) and the rear wheel assembly (3).

6. A pedal connecting rod linkage mechanism according to claim 5, characterized in that: The foot pedal assembly (5) includes a foot pedal (51) and a foot pedal tube (52). One end of the foot pedal (51) is arranged on the connecting rod (8), and the other end of the foot pedal (51) is provided with the foot pedal tube (52). The cross section of the foot pedal (51) and the foot pedal tube (52) connected and combined is in an "L" shape; one end of the foot pedal tube (52) is connected to the rotating plate (41), and the cross section of the foot pedal assembly (5) and the rotating plate (41) connected and combined is in a "U" shape.

7. The pedal-link linkage mechanism according to claim 2, characterized in that: The limiting member (6) is arranged below both ends of each lower cross frame (11), and the limiting member (6) includes a limiting plate (61), a limiting bolt (62) and a limiting ring (63). The limiting plate (61) is connected to the lower cross frame (11) through the limiting bolt (62), and the limiting ring (63) is sleeved on the limiting bolt (62). The heads of the limiting ring (63) and the limiting bolt (62) both protrude from the lower plane of the limiting plate (61); The lifting member (9) is arranged below the limiting member (6), and the lifting member (9) includes a cam plate (91) and a lifting shaft (92). The two ends of the cam plate (91) are respectively connected to a connecting rod (8) and the lifting shaft (92). The lifting shaft (92) is arranged parallel to the connecting rod (8), and the lifting shaft (92) is tightly abutted between the limiting plate (61) and the limiting ring (63).

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