Central control reset pedal assembly, medical carrier and working method of medical carrier

Abstract

The invention relates to a central control reset pedal assembly, a medical carrier and a working method thereof, and is characterized in that the central control reset pedal assembly comprises a groove shell and a sliding block arranged in the groove shell, the center of the sliding block is provided with a sliding block limiting groove and a rotor arranged in the sliding block limiting groove in a penetrating mode, and the two ends of the rotor are rotationally hinged to the groove shell; a compression spring is arranged between one side wall face of the sliding block and the groove shell, the rotating axis of the rotor is perpendicular to the sliding direction of the sliding block, a shifting block is rotationally hinged to the groove shell, a rotating shaft used for outputting different rotating stations is fixedly connected to the shifting block, the lower end of the shifting block is connected with the sliding block, and the lower end of the shifting block is connected with the groove shell. The upper end of the shifting block is connected with the pedal plate, when the pedal plate is treaded, the shifting block is driven to swing and rotate, and then the sliding block is driven to slide, so that the sliding block, the shifting block and the rotating shaft are locked on a station through the mutual clamping stagnation effect of the limiting groove and the rotor; the center control reset pedal assembly is simple in structure and reasonable in design, and one pedal can control one or more trundles to brake after the medical carrier is installed.

Description

Technical Field

[0002] The invention relates to the field of caster brake control, and in particular to a central control reset pedal assembly, a medical carrier and a working method thereof. Background Art

[0004] A medical carrier refers to a vehicle used in medical facilities for carrying items, which usually includes a platform board and four casters disposed on the platform board. In order to control the brakes of the medical carrier, a brake pedal is provided on the casters. In emergency braking or for the convenience of braking, the user usually only steps on the brake pedal of a single caster to brake. The problem with this is that the other three casters are not braked, causing the platform board and the load thereon to shift, which can easily cause the load to fall or tip over.

[0005] In order to realize that a foot pedal can control the brakes of one or more casters, a Chinese patent "A directional caster" announcement number CN209141809 has been retrieved, which includes a first control component, a second control component, a first connecting shaft and a caster; the first control component is installed on the first connecting shaft; the second control component is connected to the first control component for controlling the movement of the first control component; the top of the first support arm and the top of the second support arm are respectively rotatably installed on the two ends of the first connecting shaft, the bottom of the first support arm is installed at one end of the rotating shaft of the caster, and the bottom of the second support arm is installed at the other end of the rotating shaft of the caster; the first control component is respectively connected to the first support arm and the second support arm; the first connecting shaft is installed at the bottom of the vehicle along the lateral direction of the vehicle. Although the directional caster can realize the brake of one or more casters with one pedal, its structure is complicated and it is not convenient to adjust one pedal to control one or more casters according to different control needs. Summary of the invention

[0007] In view of the deficiencies of the above-mentioned existing technologies, an object of the present invention is to provide a central control reset pedal assembly, a medical carrier and a working method thereof. The central control reset pedal assembly has a simple structure and a reasonable design, which is conducive to realizing a foot pedal to control the brakes of one or more casters after the medical carrier is installed.

[0008] The central control reset pedal assembly of the present invention is characterized in that it includes a slot shell and a slider arranged in the slot shell, the central part of the slider is provided with a slider limit slot and a rotor inserted in the slider limit slot, both ends of the rotor are rotatably hinged on the slot shell, a compression spring is provided between one side wall of the slider and the slot shell, the rotation axis centerline of the rotor is perpendicular to the sliding direction of the slider, a shift block is rotatably hinged on the slot shell, a rotation shaft for outputting different rotation positions is fixedly connected to the shift block, the lower end of the shift block is connected to the slider, and the upper end of the shift block is connected to the foot pedal, and when the foot pedal is stepped on, the shift block is driven to swing, thereby driving the slider to slide, so that the slider, the shift block and the rotation shaft are locked at one position by the mutual blocking action of the limit slot and the rotor.

[0009] Preferably, the rotor is cylindrical, with V-shaped grooves on both sides of its cylinder, the slider limit groove has a reset area, a limit area and a toggle rotor area, the reset area is rectangular, the width direction of the reset area is larger than the long side of the rotor cross section, so that the rotation can be rotated in the reset area; the limit area and the reset area are offset in the width direction, and the width of the connection position between the limit area and the reset area is smaller than the long side of the rotor cross section, so that the slider is blocked by the rotor and cannot slide at the connection position; the toggle rotor area has a recessed groove and a pointed convex portion adjacent to the recessed groove, so that when the slider slides and the rotor is in this area, the pointed convex portion toggle the rotor to rotate; when the rotor is in the reset area, the pedal is in an unpressed position facing the pedal, that is, the pedal and the rotating shaft are not locked; when the rotor is in the limit area, the pedal is in the middle position of the downward pressure, that is, the pedal and the rotating shaft are locked; when the rotor is in the toggle rotor area, the pedal is in the extreme position of the downward pressure, that is, the pedal and the rotating shaft are not locked.

[0010] Preferably, a cover plate is fixedly installed on the slot of the above-mentioned slot shell, and a support seat for rotating the hinged rotating shaft is fixedly provided on the cover plate. The rotating shaft is passed through the center hole of the shift block, and a stop pin is fixedly provided in the middle of the rotating shaft. A stop groove cooperating with the stop pin is provided in the center hole.

[0011] Preferably, the slider is provided with a pair of lugs arranged in parallel and at intervals, the lugs are provided with cylindrical pins, and the lower part of the shift block is provided with a fork groove for inserting the cylindrical pin. When the shift block swings, the slider is driven to slide by the cooperation of the fork groove and the cylindrical pin.

[0012] Preferably, a fixed block and abutment plate are provided in parallel on opposite sides of the above-mentioned trough shell body, a guide rod for guiding the sliding of the slider is provided between the fixed block and the abutment plate, the compression spring is sleeved on the guide rod, countersunk holes are provided on the sides of the slider and the fixed block, and both ends of the compression spring are pressed in the countersunk holes of the slider and the fixed block.

[0013] Preferably, a rotor through hole for the rotor to pass through is provided on the bottom plate of the above-mentioned slot shell, a slot shell plate bridge is fixedly provided at the slot position of the slot shell, two ends of the rotor are provided with stepped portions for sleeve bearings, and the slot shell plate bridge is provided with a limiting hole for limiting and fixing the bearing at one end of the rotor, and the rotor through hole serves as a limiting hole for limiting and fixing the bearing at the other end of the rotor.

[0014] Preferably, the foot pedal is in a rectangular shape, and one side portion thereof is fixedly connected to the upper end surface of the shift block, so that the foot pedal has a suspended portion extending out of the upper end of the shift block.

[0015] The present invention uses a medical carrier using a central control reset pedal assembly, which is characterized by comprising a platform plate of the medical carrier and four controllable brake casters installed on the platform plate, the central control reset pedal assembly is detachably connected to the platform plate, a lifting column in the controllable brake casters for controlling the brakes thereof passes through the platform plate from bottom to top, and a rotating sleeve for pressing the lifting column is fixedly provided on the rotating shaft of the central control reset pedal assembly.

[0016] Preferably, the rotating shaft of the above-mentioned central control reset pedal assembly is only set on one side, and the toggle sleeve set on the rotating shaft presses against the lifting column of one of the controllable brake casters, so that one group of central control reset pedal assemblies controls the brake of one controllable brake caster; or the rotating shaft and the toggle sleeve fixed on the rotating shaft are set on both sides of the central control reset pedal assembly, and the toggle sleeves set on the two rotating shafts and the lifting columns on the two controllable brake casters respectively press against each other, so that one group of central control reset pedal assemblies controls the brake of two controllable brake casters; or the lifting columns of the two controllable brake casters at the rear of the platform board and the two toggle sleeves fixed on a hexagonal rod press against each other, and the lifting columns of the two controllable brake casters at the front of the platform board press against the toggle sleeves on the rotating shafts on both sides of a central control reset pedal assembly, and the swing arms are respectively connected to the ends of the rotating shaft and the hexagonal rod, and a connecting rod is connected between the two swing arms, so that one group of central control reset pedal assemblies controls the brakes of four controllable brake casters.

[0017] The working method of the medical carrier of the present invention is characterized in that: when the foot pedal is stepped on, the shift block is driven to swing, thereby driving the slider to slide, so that the slider, the shift block and the rotating shaft are locked at a working position due to the mutual blocking action of the limiting groove and the rotor; in a locked working position, the shift sleeve presses the lifting column, so that the controllable brake caster is in a braking state; in an unlocked working position, the shift sleeve does not press the lifting column, so that the controllable brake caster is in a state where it can move freely.

[0018] When the rotating shaft of the central control reset pedal assembly is only set on one side, one group of central control reset pedal assemblies can control the brake of one controllable brake caster; when the central control reset pedal assembly is set on both sides, one group of central control reset pedal assemblies can control the brake of two controllable brake casters; and one group of central control reset pedal assemblies can control the brake of four controllable brake casters. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] The central control reset pedal and its combined connection method of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation structures.

[0022] Figure 1 is a stereoscopic diagram of the central control reset pedal assembly of the present invention; Figure 2 It is an exploded view of the central control reset pedal assembly of the present invention; Figure 3 is a cross-sectional view of the central control reset pedal assembly of the present invention; Figure 4 is a three-dimensional view of the tank housing of the present invention; Figure 5 , 6 is a three-dimensional diagram of a slider of the present invention; Figure 7 It is a three-dimensional diagram of the rotor; Figure 8 It is a three-dimensional picture of the dial block; Fig. 9 It is a stereogram of the axis of rotation; Fig.10 , 11 It is a three-dimensional diagram of the butt plate; Fig.12 It is a stereogram of the fixed block; Fig.13 , 14 It is a partial cross-sectional view of the central control reset pedal assembly of the present invention; Fig.15 It is a working flow chart of the central control reset pedal assembly of the present invention; Fig.16 It is a three-dimensional diagram of a set of central control reset pedal assemblies controlling two casters of the present invention; Fig.17 It is a three-dimensional diagram of a set of central control reset pedal assemblies controlling four casters of the present invention; Fig.18 The present invention provides a stereoscopic diagram of a set of central control reset pedal assemblies controlling one caster and a stereoscopic diagram of a set of central control reset pedal assemblies controlling three casters.

[0023] In the figure: 01-reset area; 02-limiting area; 03-rotor area; 04-recessed groove; 05-convex part; 1. pedal; 2-steering shaft; 2.1-stop pin; 2.2-fastening screw hole; 2.3 keyway; 2.4 blind hole; 2.5 retaining ring groove; 3-fastening screw; 4-large retaining ring; 5-small retaining ring; 6-cylindrical pin; 7-slider bearing; 8-slider; 8.1- Slider through hole ;8.2-sink hole;8.3- Lugs ;8.4-bearing hole of slider;8.5-limiting groove of slider;9-lateral fastening screw of back plate;10-fastening screw of back plate and guide rod;11-back plate;11.1-lateral screw hole of back plate;11.2-fixing hole of back plate;11.3-fixing screw hole of back plate and rubber pad;12-rotor bearing;13-bearing clamping screw;14-gasket;15-rotor;15.1-V-shaped groove;15.2-step of rotor bearing back surface;15.3-cylindrical boss of rotor bearing;15.4-rotor plane;16-slot shell;16.1-slot shell and cover plate fixing screw hole;16.2- Trough shell and fixing hole; 16.3-trough shell plate bridge; 16.4-hole gasket superimposed on the plate bridge hole; 16.5-rotor through hole; 16.6-riveted nut at the bottom of the trough shell; 16.7-trough shell side and abutment plate fixing hole; 17-cover plate; 18-support seat; 19-support seat bearing; 20-shift block; 20.1-stop groove; 20.2-fork groove; 20.3-center hole; 21-compression spring; 22-guide rod; 23-fixed block; 23.1-fixed block fixing hole; 23.2-fixed block blind hole; 24-rubber pad; 25-single-sided hexagonal rod; 26-swing arm; 27-connecting rod; 28-hexagonal rod; 29-platform plate; 30-shift sleeve; 31-lifting column; 32-controllable brake caster.

[0024] Specific implementation structure In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In conjunction with the accompanying drawings, some implementation structures of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0029] The central control reset pedal assembly of the present invention comprises a slot housing 16 and a slider 8 arranged in the slot housing, the central part of the slider 8 is provided with a slider limiting groove 8.5 and a rotor 15 penetrated in the slider limiting groove, both ends of the rotor 15 pass through the slider limiting groove 8.5 and are rotatably hinged on the slot housing 16, a compression spring 21 is provided between one side wall of the slider and the slot housing, the rotation axis of the rotor is perpendicular to the sliding direction of the slider, a shift block 20 is rotatably hinged on the slot housing, a rotating shaft 2 for outputting different rotation positions is fixedly connected to the shift block 20, one of the rotation positions of the rotating shaft 2 is a locking position, the lower end of the shift block 20 is connected to the slider 8, and the upper end of the shift block 20 is connected to the foot pedal 1, when the foot pedal is stepped on, the shift block 20 is driven to swing around its axis, thereby driving the slider 8 to slide, so that the slider 8, the shift block 20 and the rotating shaft 2 are locked in one position by the mutual blocking action of the limiting groove 8.5 and the rotor 15.

[0030] During operation, when the foot pedal is stepped on, the shift block is driven to swing, thereby driving the slider to slide, so that the slider, the shift block and the rotating shaft are locked in one position due to the mutual blocking action of the limiting groove and the rotor, thereby realizing that the rotating shaft 2 can output different rotation positions. When in the locked position, the shift sleeve 30 on the rotating shaft 2 presses the lifting column 31, so that the controllable brake caster 32 is in a braking state. When in the unlocked position, the shift sleeve 30 does not press the lifting column 31, so that the controllable brake caster 32 is in a state where it can move freely.

[0031] Specifically, the limit groove 8.5 and the rotor 15 are locked with each other. The rotor is cylindrical and has V-shaped grooves 15.1 on both sides of its cylinder. The slider limit groove has a reset area 01, a limit area 02 and a rotor dial area 03. The reset area is rectangular, and the width direction of the reset area is larger than the long side of the rotor cross section, so that the rotation can be rotated in the reset area; the limit area and the reset area are misaligned in the width direction, and the width of the connection position between the limit area and the reset area is smaller than the long side of the rotor cross section, so that the slider is blocked by the rotor and cannot slide at the connection position; the rotor dial area has a recessed groove 04 and a pointed protrusion 05 adjacent to the recessed groove, so that when the slider slides and the rotor is in this area, the pointed protrusion that moves with the slider drives the rotor to rotate; when the rotor is in the reset area, the pedal facing the foot pedal is in an unpressed position, that is, the foot pedal and the rotating shaft are not locked (such as Fig.15 As shown in the upper left figure), the controllable brake caster 32 is in a state where it can move freely; when the rotor is in the limit zone, the foot pedal is in the middle position of the downward pressure, that is, the foot pedal and the rotating shaft are locked. At this time, the rotating shaft drives the dial sleeve 30 to press the lifting column 31 to achieve the brake of the caster (as shown in the upper left figure). Fig.15 When the rotor is in the rotating rotor area, the pedal is in the extreme downward position, that is, the pedal and the rotating shaft are not locked, so that the controllable brake caster 32 is in a state where it can move freely (such as Fig.15 ).

[0032] The limit area 02 is also the aforementioned locking position, that is, at this time, the slider 8, the shift block 20 and the rotating shaft 2 are locked in the locking position due to the mutual blocking effect of the limit groove 8.5 and the rotor 15 (mutual blocking in the limit area 02), that is, at this time, the rotating shaft drives the shift sleeve 30 to press the lifting column 31 to achieve the braking of the caster; the setting of the above-mentioned reset area 01, the limit area 02 and the shift rotor area 03 realizes that the operator releases the pedal after stepping on the pedal to the bottom once, and the caster brakes, and the operator releases the pedal after stepping on the pedal to the bottom for the second time, and the caster brake is unlocked.

[0033] In order to facilitate independent use, a cover plate 17 is fixedly installed on the notch of the above-mentioned slot shell (the cover plate 17 and the platform plate 29 are detachably connected by bolts, etc.), and a support seat 18 for rotating the hinged rotating shaft is fixedly provided on the cover plate 17. The rotating shaft 2 is passed through the central hole of the shift block, and a stop pin 2.1 is fixedly provided in the middle of the rotating shaft. A stop groove 20.1 cooperating with the stop pin is provided in the central hole 20.3 of the shift block 20, and the stop groove 20.1 can pass through the entire central hole of the shift block 20. Its function is that after the stop pin 2.1 on the rotating shaft 2 is inserted, the two can rotate synchronously, that is, when the shift block 20 rotates, it can drive the rotating shaft to rotate synchronously, and when the shift block 20 is restricted from rotating by the action of the slider, the rotating shaft is also restricted from rotating (this is the locking position).

[0034] The slider 8 is provided with a pair of lugs 8.3 arranged in parallel and at intervals, and the two lugs are rotatably hinged to the two ends of the cylindrical pin 6 through the slider bearing 7. The lower part of the shift block 20 is provided with a fork groove 20.2 for inserting the cylindrical pin. When the shift block swings, the slider is driven to slide through the cooperation of the fork groove and the cylindrical pin.

[0035] A fixed block 23 and a butt plate 11 are provided in parallel on opposite sides of the groove shell body, a guide rod 22 for guiding the sliding of the slider is provided between the fixed block and the butt plate, the guide rod is sleeved with the compression spring 21, countersunk holes are provided on the side surfaces of the slider 8 and the fixed block 23 (on the opposite sides of the two), and the two ends of the compression spring are pressed in the countersunk holes of the slider and the fixed block. Through the action of the compression spring, the slider 8, the shift block 20 and the rotating shaft 2 have a tendency to reset (that is, even if the rotor is in the reset area of ​​the slider limit groove), and the external force driving the slider 8, the shift block 20 and the rotating shaft 2 to move comes from the operator stepping on the foot pedal.

[0036] A rotor through hole 16.5 for the rotor to pass through is provided on the bottom plate of the slot shell 16, a slot shell plate bridge 16.3 is fixedly provided at the slot position of the slot shell, stepped portions for sleeve bearings are provided at both ends of the rotor, a limiting hole for limiting and fixing the bearing at one end of the rotor is provided on the slot shell plate bridge, and the rotor through hole 16.5 serves as a limiting hole for limiting and fixing the bearing at the other end of the rotor, a screw hole is provided on the bottom plate beside the rotor through hole 16.5, and a gasket 14 capable of resisting the bearing is provided below the bottom plate, and the gasket 14 is locked and fixed with the screw hole by screws to prevent the rotor from falling out.

[0037] The foot pedal 1 is rectangular in shape, and one side thereof is fixedly connected to the upper end surface of the shift block, so that the foot pedal has a suspended portion extending out of the upper end of the shift block. By stepping on the suspended portion, it is helpful to drive the shift block 20 to rotate.

[0038] The present invention uses a medical carrier with a central control reset pedal assembly, including a platform plate 29 of the medical carrier and four controllable brake casters 32 installed on the platform plate 29, the central control reset pedal assembly is detachably connected to the platform plate, a lifting column 31 in the controllable brake caster for controlling its braking passes through the platform plate 29 from bottom to top, and a rotating sleeve 30 for pressing the lifting column is fixedly provided on the rotating shaft of the central control reset pedal assembly, the rotating sleeve 30 is a cam structure, when the distal point of the cam abuts the lifting column 31, the lifting column is pressed to achieve the braking of the caster, when the proximal point of the cam does not abut the lifting column 31, the caster can move freely.

[0039] The central control reset pedal assembly is applied to the medical carrier, which has multiple control methods, such as Figure 16-18 As shown, one set of central control reset pedal assembly controls one caster, one set of central control reset pedal assembly controls two casters, one set of central control reset pedal assembly controls three casters, and one set of central control reset pedal assembly controls four casters; Specifically, the rotating shaft of the central control reset pedal assembly is only arranged on one side, and the rotating sleeve arranged on the rotating shaft presses against the lifting column of one of the controllable brake casters, so that one set of central control reset pedal assemblies controls the brake of one controllable brake caster; Both sides of the central control reset pedal assembly are provided with a rotating shaft and a rotating sleeve 30 fixed on the rotating shaft (the rotating sleeve 30 can be installed on the single-sided hexagonal rod 25 installed on the rotating shaft), and the rotating sleeves arranged on the two rotating shafts and the lifting columns on the two controllable brake casters are pressed against each other respectively, so that one set of central control reset pedal assemblies controls the brakes of the two controllable brake casters; The lifting columns of the two controllable brake casters on the rear of the platform board are pressed against two rotating sleeves fixed on a hexagonal rod 28, and the lifting columns of the two controllable brake casters on the front of the platform board are pressed against the rotating sleeves on the double-sided rotating shafts of a central control reset pedal assembly. Swing arms 26 are respectively connected to the ends of the rotating shaft and the hexagonal rod, and a connecting rod 27 is connected between the two swing arms, so that a group of central control reset pedal assemblies can control the brakes of four controllable brake casters.

[0040] A rubber pad 24 is provided on the inner side of the abutment plate 11 to act as a buffer for the slider. Support seat bearings 19 are provided at both ends of the rotating shaft 2 to realize the rotation and hinge connection of the rotating shaft on the support seat 18. Retaining spring grooves 2.5 are provided on both ends of the rotating shaft. A large retaining spring 4 is clamped on the retaining spring groove 2.5 to limit the axial movement of the bearing. Small retaining springs 5 ​​are also provided at both ends of the cylindrical pin 6 to limit the axial movement of the slider bearing.

[0041] The working method of the medical carrier of the present invention drives the shift block to swing when the foot pedal is stepped on, thereby driving the slider to slide, so that the slider, the shift block and the rotating shaft are locked in a working position due to the mutual blocking action of the limiting groove and the rotor. In a locked working position, the shift sleeve presses the lifting column, so that the controllable brake caster is in a braking state. In an unlocked working position, the shift sleeve does not press the lifting column, so that the controllable brake caster is in a state where it can move freely.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention.

Claims

1. A central control reset pedal assembly, characterized in that: The invention comprises a slot shell and a slider arranged in the slot shell, a slider limiting slot and a rotor inserted in the slider limiting slot are arranged at the central part of the slider, two ends of the rotor are rotatably hinged on the slot shell, a compression spring is arranged between one side wall of the slider and the slot shell, the rotation axis center line of the rotor is perpendicular to the sliding direction of the slider, a shift block is rotatably hinged on the slot shell, a rotating shaft for outputting different rotation positions is fixedly connected to the shift block, the lower end of the shift block is connected to the slider, and the upper end of the shift block is connected to the foot pedal, and when the foot pedal is stepped on, the shift block is driven to swing, thereby driving the slider to slide, so that the slider, the shift block and the rotating shaft are locked at one position by the mutual blocking action of the limiting slot and the rotor.

2. The central control reset pedal assembly according to claim 1, characterized in that: The rotor is cylindrical, with V-shaped grooves on both sides of its cylindrical body, and the slider limit groove has a reset area, a limit area and a toggle rotor area. The reset area is rectangular, and the width direction of the reset area is greater than the long side of the rotor cross section, so that the rotation can be rotated in the reset area; the limit area and the reset area are misaligned in the width direction, and the width of the connection position between the limit area and the reset area is less than the long side of the rotor cross section, so that the slider is blocked by the rotor and cannot slide at the connection position; the toggle rotor area has a concave groove and a convex part adjacent to the concave groove, so that when the slider slides and the rotor is in this area, the convex part toggle the rotor to rotate; when the rotor is in the reset area, the pedal is in an unpressed position facing the pedal, that is, the pedal and the rotating shaft are not locked; when the rotor is in the limit area, the pedal is in the middle position of the downward pressure, that is, the pedal and the rotating shaft are locked; when the rotor is in the toggle rotor area, the pedal is in the extreme position of the downward pressure, that is, the pedal and the rotating shaft are not locked.

3. The central control reset pedal assembly according to claim 1 or 2, characterized in that: A cover plate is fixedly installed on the slot of the slot shell, and a support seat for rotating the hinged rotating shaft is fixedly provided on the cover plate. The rotating shaft is passed through the central hole of the shift block, a stop pin is fixedly provided in the middle of the rotating shaft, and a stop groove cooperating with the stop pin is provided in the central hole.

4. The central control reset pedal assembly according to claim 1 or 2, characterized in that: The slider is provided with a pair of lugs arranged in parallel and at intervals, the lugs are provided with cylindrical pins, and the lower part of the shift block is provided with a fork groove for locking the cylindrical pin. When the shift block swings, the slider is driven to slide through the cooperation of the fork groove and the cylindrical pin.

5. The central control reset pedal assembly according to claim 1 or 2, characterized in that: A fixed block and abutment plate are provided in parallel on opposite sides of the trough shell body, a guide rod for guiding the sliding of the slider is provided between the fixed block and the abutment plate, the compression spring is sleeved on the guide rod, countersunk holes are provided on the sides of the slider and the fixed block, and both ends of the compression spring are pressed in the countersunk holes of the slider and the fixed block.

6. The central control reset pedal assembly according to claim 1 or 2, characterized in that: A rotor through hole for the rotor to pass through is provided on the bottom plate of the slot shell, a slot shell plate bridge is fixedly provided at the slot position of the slot shell, stepped portions for sleeve bearings are provided at both ends of the rotor, a limiting hole for limiting and fixing the bearing at one end of the rotor is provided on the slot shell plate bridge, and the rotor through hole serves as a limiting hole for limiting and fixing the bearing at the other end of the rotor.

7. The central control reset pedal assembly according to claim 1 or 2, characterized in that: The foot pedal is in a rectangular shape, and one side portion thereof is fixedly connected to the upper end surface of the shift block, so that the foot pedal has a suspended portion extending out from the upper end of the shift block.

8. A medical carrier using the central control reset pedal assembly according to any one of claims 1 to 7, characterized in that: It includes a platform plate of a medical carrier and four controllable brake casters installed on the platform plate. The central control reset pedal assembly is detachably connected to the platform plate. A lifting column for controlling the brakes of the controllable brake casters passes through the platform plate from bottom to top. A rotating sleeve for pressing the lifting column is fixed on the rotating shaft of the central control reset pedal assembly.

9. The medical carrier according to claim 8, characterized in that: The rotating shaft of the central control reset pedal assembly is only set on one side, and the toggle sleeve set on the rotating shaft presses against the lifting column of one of the controllable brake casters, so that one group of central control reset pedal assemblies controls the brake of one controllable brake caster; or the rotating shaft and the toggle sleeve fixed on the rotating shaft are set on both sides of the central control reset pedal assembly, and the toggle sleeves set on the two rotating shafts and the lifting columns on the two controllable brake casters respectively press against each other, so that one group of central control reset pedal assemblies controls the brake of two controllable brake casters; or the lifting columns of the two controllable brake casters at the rear of the platform board and the two toggle sleeves fixed on a hexagonal rod press against each other, and the lifting columns of the two controllable brake casters at the front of the platform board and the toggle sleeves on the rotating shafts on both sides of a central control reset pedal assembly press against each other, and the swing arms are respectively connected to the ends of the rotating shaft and the hexagonal rod, and a connecting rod is connected between the two swing arms, so that one group of central control reset pedal assemblies controls the brakes of four controllable brake casters.

10. A working method of the medical carrier according to claim 8 or 9, characterized in that: When the foot pedal is stepped on, the shifting block is driven to swing, thereby driving the slider to slide, so that the slider, the shifting block and the rotating shaft are locked at a position due to the mutual blocking action between the limiting groove and the rotor. In a locked position, the shifting sleeve presses the lifting column, so that the controllable brake caster is in a braking state. In an unlocked position, the shifting sleeve does not press the lifting column, so that the controllable brake caster is in a state of being able to move freely. When the rotating shaft of the central control reset pedal assembly is only set on one side, one group of central control reset pedal assemblies can control the brake of one controllable brake caster; when the central control reset pedal assembly is set on both sides, one group of central control reset pedal assemblies can control the brake of two controllable brake casters; and one group of central control reset pedal assemblies can control the brake of four controllable brake casters.

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