CN117002182A

CN117002182A - Self-braking running gear

Info

Publication number: CN117002182A
Application number: CN202211623867.3A
Authority: CN
Inventors: 林帮军
Original assignee: Haijiya Intelligent Medical Technology Guangzhou Co ltd
Current assignee: Haijiya Intelligent Medical Technology Guangzhou Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-11-07

Abstract

The application provides a self-braking running gear which comprises a running frame, an operating handle and a plurality of casters, wherein the casters are connected with the running frame, the operating handle is connected with the running frame, the casters comprise a wheel frame, a wheel body, a driving mechanism and a braking mechanism, the wheel body is connected with the wheel frame, the wheel frame is connected with the running frame, the driving mechanism and the braking mechanism are both arranged on the wheel frame, the driving mechanism is in transmission connection with the braking mechanism, the driving mechanism of each caster is in transmission connection with the operating handle, and after the driving handle applies driving force to the driving mechanism, the driving mechanism drives and enables the braking mechanism to release braking of the wheel body, or after the driving force applied to the operating handle is removed, the driving mechanism self-resets and drives the braking mechanism to brake the wheel body; the self-braking running gear has the advantages of reasonable structure, simple use and safe and reliable use.

Description

Self-braking running gear

Technical Field

The application belongs to the technical field of medical appliances, and particularly relates to a self-braking walking device.

Background

Casters, also called rollers, are a widely used mechanical device that is usually installed at the bottom of devices requiring walking, such as nursing beds, seats, carts, etc., and allows easy movement of the devices, such as nursing beds, seats, carts, etc.; however, the running gear in the prior art has the problem of inconvenient use, such as a novel brake castor disclosed in the patent application number 201921996679.9. Specifically, taking a nursing bed as an example, four casters are generally required to be installed on one nursing bed, and when the nursing bed needs to be fixed, the casters on the nursing bed need to be stopped, so that the casters cannot roll freely, and the aim of fixing the nursing bed is fulfilled; furthermore, when the casters are braked, the operator needs to brake each caster through the foot, and similarly, when the casters are unlocked, that is, the casters are braked or unlocked, the same actions are repeated four times, so that the walking device is inconvenient to use; meanwhile, the casters in the prior art have certain safety trapping in the use process, and also take a nursing bed as an example, when the casters are forgotten to stop, or the casters are not completely stopped, the nursing bed is in a relatively unstable state, for example, when a user gets on or off the bed or the attendant leans on the nursing bed, a thrust force is inevitably generated on the nursing bed at the moment, so that the nursing bed can be moved, and further, the related personnel can fall down and cause personal injury.

Disclosure of Invention

Therefore, the application aims to provide the self-braking running gear which is reasonable in structure, simple to use and safe and reliable to use.

In order to solve the technical problems, the application adopts the following technical scheme:

the utility model provides a from formula running gear of stopping, its includes walking frame, action bars and a plurality of truckle, the truckle is fixed respectively around the walking frame bottom, just the truckle is to the walking frame forms the support, the action bars with the walking frame forms through the round pin axle and rotates to be connected, the truckle includes wheel carrier, wheel body, actuating mechanism and brake mechanism, the wheel body with the wheel carrier is connected, just the wheel body can rotate for the wheel carrier, the wheel carrier with the walking frame is connected, actuating mechanism with brake mechanism all installs on the wheel carrier, actuating mechanism with brake mechanism transmission is connected, brake mechanism with the wheel body is mutually supported, and every truckle actuating mechanism all with the action bars transmission is connected, through the action bars is to after actuating mechanism applys the driving force, actuating mechanism drives and makes brake mechanism release to the stopping of wheel body, perhaps, after removing the driving force of exerting on the action bars, actuating mechanism self-reset and drive brake mechanism the wheel body.

As a further improvement of the self-braking type walking device, the walking frame is any one of a nursing bed walking frame, a trolley walking frame and a seat walking frame.

As a further improvement on the self-braking running gear, the castor also comprises a steering mechanism, the wheel frame is connected with the steering mechanism, the wheel frame can rotate relative to the steering mechanism, and the driving mechanism is mutually matched with the steering mechanism;

after the driving force is applied to the driving mechanism through the operating handle, the driving mechanism releases the locking of the steering mechanism, or after the driving force applied to the operating handle is removed, the driving mechanism is self-reset and the wheel frame is locked with the steering mechanism.

As a further improvement of the self-braking running gear, the braking mechanism comprises a rocker arm, a braking drum and a braking pin, the rocker arm is rotationally connected with the wheel frame, the braking pin is fixed at one end of the rocker arm, the other end of the rocker arm is connected with the driving mechanism, the braking drum is fixed on the wheel body, and when the braking mechanism is in a braking state, the braking pin is abutted against the inner wall of the braking drum;

and/or, a plurality of first tooth grooves are further formed in the side wall of the brake drum along the circumferential direction of the brake drum, and when the brake mechanism is in a brake state, the brake pin is clamped in any one of the first tooth grooves.

As a further improvement of the self-braking running gear, the steering mechanism comprises a first connecting part and a second connecting part, the first connecting part is fixedly connected with the second connecting part, the first connecting part is used for connecting external equipment, the second connecting part is connected with the wheel frame, and the second connecting part is connected with the driving mechanism.

As a further improvement of the self-braking running gear, the driving mechanism comprises a first guide post, a second guide post, a first elastic piece and a second elastic piece, wherein the first guide post is in sliding connection with the wheel frame, one end of the first elastic piece is abutted against the wheel frame, the other end of the first elastic piece is abutted against the first end of the first guide post, the second end of the first guide post is abutted against the first end of the second guide post, the second end of the second guide post is in sliding connection with the second connecting part, and one end of the second elastic piece is abutted against the second guide post, and the other end of the second elastic piece is abutted against the wheel frame;

the end face of the first end of the first guide post is also provided with a plurality of second tooth grooves, the second tooth grooves are arranged around the axial lead of the first guide post, and the end face of the first end of the second guide post is provided with convex teeth matched with the second tooth grooves;

after the driving force is applied to the operating handle, the driving mechanism drives and enables the brake mechanism to release the brake of the wheel body, and the steering mechanism can drive the second guide post to rotate relative to the first guide post;

or after the driving force applied to the operating handle is removed, the driving mechanism is self-reset and drives the braking mechanism to brake the wheel body, and the second guide post and the first guide post are locked and the wheel frame is in a non-rotatable state relative to the steering seat.

As a further improvement on the self-braking running gear, the driving mechanism further comprises a guy cable, one end of the guy cable is rotationally connected with the second guide post, the second end of the guy cable is connected with the operating handle, and the guy cable is used for driving and separating the second guide post and the convex teeth from the second tooth sockets on the first guide post relative to the axial direction of the first guide post or the second guide post;

and the inhaul cable penetrates through the steering seat, the first connecting part and the second connecting part relative to the axial direction of the steering mechanism.

As a further improvement on the self-braking running gear, the elastic coefficient of the second elastic piece is larger than that of the first elastic piece, after the driving force applied to the driving mechanism is removed, the second elastic piece pushes and enables the second guide post to be abutted to the first guide post, and the second guide post and the convex teeth on the first guide post are meshed with the second tooth grooves, so that the wheel frame and the steering seat are locked.

As a further improvement on the self-braking running gear, the rocker arm comprises a first force arm, a second force arm, a third connecting part and a fourth connecting part, wherein the first end of the first force arm is fixedly connected with the first end of the second force arm, an included angle is formed between the axes of the first force arm and the second force arm, and the length of the first force arm is larger than that of the second force arm;

the third connecting portion is located at the joint of the first force arm and the second force arm, the brake pin is fixed at the second end of the second force arm, the fourth connecting portion is fixed at the second end of the first force arm, and the fourth connecting portion is in transmission connection with the driving mechanism.

As a further improvement of the self-braking running gear, a ring-shaped groove is arranged on the wheel side of the wheel body, a first baffle which is mutually matched with the groove is arranged on the wheel frame, the end part of the first baffle is arranged in the groove relative to the axial direction of the wheel body, the first baffle extends along the circumferential direction of the groove and at least fills part of the groove, and the wheel body can rotate relative to the first baffle;

or, a first baffle plate in a ring shape is arranged on the wheel side of the wheel body, a groove which is matched with the first baffle plate is arranged on the wheel frame, the end part of the first baffle plate is arranged in the groove relative to the axial direction of the wheel body, at least part of the first baffle plate is covered by the groove relative to the circumferential direction of the first baffle plate, and the first baffle plate can rotate relative to the wheel frame;

the first baffle is close to the wheel surface of the wheel body, and when the first baffle fills part of the groove, the first baffle is positioned at the bottom of the wheel frame;

the wheel carrier is also provided with a second baffle plate, the second baffle plate is positioned above the wheel body and covers the wheel body, and the second baffle plate is fixedly connected with the wheel carrier.

Compared with the prior art, the application has the following main beneficial effects: the driving mechanism is arranged on the castor and is matched with the braking mechanism, and after the driving force applied to the driving mechanism is removed, the driving mechanism is self-reset and drives the braking mechanism to brake the wheel body, namely, the braking or the releasing braking of the castor can be completed by performing single control action on the castor; further, an operation handle is arranged on the walking frame, meanwhile, the driving mechanism of each caster is in transmission connection with the operation handle, namely, all casters can be released through one action of the operation handle (such as manual operation), so that the walking device can move freely, and after the operation handle is released, the control on the driving device can be released, namely, the casters are self-reset and the walking device is stopped, namely, the driving mechanism of the casters drives the operation handle to self-reset (so as to conveniently carry out the next brake releasing operation) when the driving mechanism of the casters is self-reset, so that the convenience of the walking device in the use process is improved, and the safety or the reliability of the walking device in the use process is also improved.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intentionally drawn to scale on actual size or the like, with emphasis on illustrating the principles of the application.

FIG. 1 is a schematic diagram of the overall structure of a self-braking running gear of the present application;

FIG. 2 is a schematic view of a partial structure of the self-braking running gear of the present application;

FIG. 3 is a schematic view of the overall structure of the caster of the present application

FIG. 4 is a schematic side view of the caster of the present application with one side wheel removed;

FIG. 5 is an exploded view of the caster of the present application in a bottom view;

FIG. 6 is an exploded view of the caster of the present application in a top view;

FIG. 7 is a schematic view of a rocker arm according to the present application;

fig. 8 is a schematic view of a partial cross-sectional structure of a caster of the present application.

Detailed Description

The technical solutions of the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments so that those skilled in the art may better understand the present application and implement the same, but the illustrated embodiments are not limiting of the present application, and in this embodiment, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present application, and do not indicate or imply that the referred devices or elements must have specific orientations, be configured and operated in specific orientations, and therefore should not be construed as limiting of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to and integrated with the other element or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.

As shown in fig. 1-8, the present embodiment provides a self-braking running gear, which includes a running frame 30, an operating handle 31 and a plurality of casters 32, wherein four casters 32 are provided in the present embodiment, and the four casters 32 are all fixed around the bottom of the running frame 30, so that the running frame 30 is supported by the casters 32; further, the operation handle 31 is rotatably connected with the walking frame 30 through a pin shaft, and each caster 32 is in transmission connection with the operation handle 31, that is, the braking or releasing of the casters 32 is controlled through the operation handle 31. Further, the caster 32 comprises a wheel frame 1, a wheel body 2, a driving mechanism 3 and a braking mechanism 4, wherein the wheel body 2 is connected with the wheel frame 1 through a wheel shaft 26, so that the wheel body 2 can rotate relative to the wheel frame 1, and the wheel frame 1 is used as a supporting piece for the wheel body 2 or the wheel frame 1 is used as a carrier for the wheel body 2. The wheel frame 1 and the walking frame 30 are fixed through clamping or bolts, the driving mechanism 3 and the braking mechanism 4 are both arranged on the wheel frame 1, the driving mechanism 3 is in transmission connection with the braking mechanism 4, and the braking mechanism 4 is matched with the wheel body 2. Further, the driving mechanism 3 of each caster 32 is in transmission connection with the operation handle 31 (through a cable), that is, after a driving force is applied to the driving mechanism 3 through the operation handle 31, the driving mechanism 3 further drives and releases the brake mechanism 4 to brake the wheel body 2, or after a driving force applied to the operation handle 31 is removed, the driving mechanism 3 self-resets and drives the brake mechanism 4 to brake the wheel body 2.

Specifically, by providing the driving mechanism 3 on the caster 32, which is matched with the braking mechanism 4, after the driving force applied to the driving mechanism 3 is removed, the driving mechanism 3 is self-reset and drives the braking mechanism 4 to brake the caster body, that is, the braking or the releasing braking of the caster 32 can be completed by performing a single control action on the caster 32; further, the running frame 30 is provided with the operation handle 31, meanwhile, the driving mechanism 3 of each caster 32 is in transmission connection with the operation handle 31, that is, all casters 32 can be released through the operation of the operation handle 31 (such as manual operation) once, so that the running device can move freely, and after the operation handle 31 is released, the control on the driving device can be released, that is, the casters 32 are self-reset and the running device is stopped, that is, the driving mechanism 3 of the casters 32 also drives the operation handle 31 to self-reset (so as to facilitate the next brake releasing operation), thereby improving the convenience of the running device in the use process, and improving the safety or reliability of the running device in the use process.

1-2, in a preferred embodiment, the walking frame 30 is any one of a nursing bed walking frame, a cart walking frame, a seat walking frame; in this embodiment, the walking frame 30 is a cart walking frame, and further, the cart walking frame in this embodiment is used for loading medical records, that is, a medical record cart. Further, in the present embodiment, the operation handle 31 is a manual operation handle, for example, when a patient needs to move the medical record, the operation handle 31 is pressed down, and the operation handle 31 drives and releases the brake casters through the cables, so that the medical record cart can move freely; on the contrary, when the operation handle 31 is released, the casters are self-reset, that is, the braking state of the casters is restored, and the calendar cart is in an immovable state.

In the preferred embodiment, as shown in fig. 3-6, the castor wheel 32 further comprises a steering mechanism 5, the wheel carrier 1 is connected to the steering mechanism 5, the wheel carrier 1 is rotatable relative to the steering mechanism 5, and the driving mechanism 3 cooperates with the steering mechanism 5. After the steering mechanism 5 is provided on the wheel carrier 1, the wheel carrier 1 or the wheel body 2 on the wheel carrier 1 can be flexibly rotated, that is to say, the movement direction can be freely adjusted when the caster 32 is mounted on a bed, a seat or a cart. Further, when a driving force is applied to the driving mechanism 3 through the operation handle 31, the driving mechanism 3 releases the brake of the wheel body 2 and also releases the lock of the steering mechanism 5 in addition to the brake mechanism 4; alternatively, when the driving force applied to the operation handle 31 is removed, that is, the driving force applied to the driving mechanism 3 is removed, the driving mechanism 3 self-resets and drives the braking mechanism 4 to brake the wheel body 2, and at the same time, the driving mechanism 3 is also driven and the wheel carrier 1 is locked with the steering mechanism 5. That is, the driving mechanism 4 synchronously controls the steering mechanism 5 and the braking mechanism 4. Specifically, for example, when the casters 32 are mounted on the nursing bed, in order to enable the casters 32 to smoothly turn during use, the rotation axis of the wheel frame 1 relative to the turning mechanism 5 and the rotation axis of the wheel body 2 relative to the wheel frame 1 are spaced apart, or the projection points of the legs of the nursing bed relative to the ground and the contact points of the wheel body 2 relative to the ground are spaced apart; that is, when the braking mechanism 4 brakes the wheel body 2, the nursing bed can not move any more, but the nursing bed can shake by taking the steering mechanism 5 as a movable point, so that the nursing bed is in an unstable state; therefore, after the steering mechanism 5 is locked synchronously through the driving mechanism 3, the nursing bed can be in a stable state when the nursing bed does not need to be moved, so that the convenience of using the casters 32 and the nursing bed is further improved. Relatively speaking, if the casters in the prior art forget to lock, the nursing bed is in a relatively unstable state, for example, when a user gets on or off the bed or a person to be attended leans to the nursing bed, a pushing force is inevitably generated on the nursing bed, so that the nursing bed is moved, and further, the person may fall down and be injured.

As shown in fig. 5-6, in a preferred embodiment, the braking mechanism 4 includes a rocker arm 6, a braking drum 7 and a braking pin 8, the rocker arm 6 is rotationally connected with the wheel frame 1 through a pin shaft, the braking pin 8 is fixed at one end of the rocker arm 6, the braking pin 8 in this embodiment is in a strip shape, the braking pin 8 and the rocker arm 6 are integrally formed, the other end of the rocker arm 6 is in transmission connection with the driving mechanism 3, the braking drum 7 is fixed on the wheel body 2, and the braking drum 7 in this embodiment is integrally formed with the wheel body 2. Further, when the brake mechanism 4 is in a brake state, the brake pin 8 is abutted against the inner wall of the brake drum 7. Further, the inner wall of the brake drum 7 along the circumferential direction is further provided with a plurality of first tooth grooves 9, when the brake mechanism 4 is in the brake state, the brake pin 8 is clamped in any one of the first tooth grooves 9, and in this embodiment, the axis of each first tooth groove 9 is parallel to the rotation axis of the wheel body 2, that is, after the brake pin 8 is clamped in the first tooth groove 9 of the brake drum 7, the wheel frame 1 of the wheel body 2 is in a non-rotatable state, that is, the caster 32 is braked.

As shown in fig. 5 to 6, in the preferred embodiment, the steering mechanism 5 includes a first connecting portion 11 and a second connecting portion 12, one ends of the first connecting portion 11 and the second connecting portion 12 are fixedly connected, and the first connecting portion 11 and one end of the second connecting portion 12 in this embodiment are integrally formed; further, the first connecting portion 11 is used for connecting an external device, for example, the first connecting portion 11 is fixed on a bed leg of a nursing bed, the second connecting portion 12 is connected to the wheel frame 1 through a bearing 13, that is, the wheel frame 1 can rotate relative to the first connecting portion 11 or the second connecting portion 12, and the second connecting portion 12 is connected to the driving mechanism 3. Further, the dust collecting device further comprises a cover plate 10, the cover plate 10 is sleeved outside the second connecting portion 12, the cover plate 10 is used for shielding the connecting portion of the second connecting portion 12 and the wheel frame 1, dust is prevented or reduced from directly falling on the connecting portion of the second connecting portion 12 and the wheel frame 1, and abrasion of the bearing 13 caused by entering the dust is further prevented or reduced.

As shown in fig. 5-6, in a preferred embodiment, the drive mechanism 3 comprises a first guide post 14, a second guide post 15, a first resilient member 16 and a second resilient member 17, the first guide post 14 being slidably connected to the wheel carrier 1. Specifically, the wheel carrier 1 is provided with a chute, and the first guide post 14 is disposed in the chute and reciprocates along the length direction of the chute, and the axis of the chute is parallel to the axis of the first guide post 14. Further, one end of the first elastic member 16 is abutted against the wheel frame 1, the other end is abutted against the first end of the first guide post 14, the second end of the first guide post 14 is abutted against the first end of the second guide post 15, and the second end of the second guide post 15 is slidably connected with the second connecting portion 12; specifically, the end of the second connecting portion 12 is provided with an external spline 18, which may, of course, be a polygonal cylinder, such as a quadrangular cylinder; the second guide post 15 is also provided with an internal spline (not shown) that is matched with the external spline 18, so that the second guide post 15 can slide along the axis or the length direction of the second connecting portion 12, but cannot rotate relative to the second connecting portion 12; further, one end of the second elastic member 17 abuts against the second guide post 15, and the other end abuts against the wheel carrier 1.

As shown in fig. 5 to 6, in the preferred embodiment, a plurality of second tooth grooves 19 are further provided on the end surface of the first end of the first guide post 14, the second tooth grooves 19 are arranged radially around the axis of the first guide post 14, and the protruding teeth 20 that are mutually matched with the second tooth grooves 19 are provided on the end surface of the first end of the second guide post 15. Further, after the driving force is applied to the driving mechanism 3 through the operation handle 31, the driving mechanism 3 drives and enables the brake mechanism 4 to release the brake of the wheel body 2, and the steering mechanism 5 can drive the second guide post 15 to rotate relative to the first guide post 14; or, after the driving force applied to the driving mechanism 3 is removed, the driving mechanism 3 self-resets and drives the braking mechanism 4 to brake the wheel body 2, and the second guide post 15 and the first guide post 14 are locked, so that the wheel carrier 1 is in a non-rotatable state relative to the steering seat 10, and further, the running gear is in a non-movable state. Further, the driving mechanism 3 further includes a cable 21, one end of the cable 21 is connected to the second guide post 15 and is rotatably connected, the second end of the cable 21 is connected to the operating handle 31, and the cable 21 is used for driving and separating the second guide post 15 and the teeth 20 from the second tooth grooves 19 on the first guide post 14 with respect to the axial direction of the first guide post 14 or the second guide post 15. The cable 21 penetrates the steering seat 10, the first connection portion 11, and the second connection portion 12 with respect to the axial direction of the steering mechanism 5. The first elastic member 16 and the second elastic member 17 in this embodiment are both coil springs; and the elastic coefficient of the second elastic member 17 is larger than that of the first elastic member 16, after the driving force applied to the driving mechanism 3 is removed, the second elastic member 17 pushes and enables the second guide post 15 to abut against the first guide post 14, and the second guide post 15 and the convex teeth 20 on the first guide post 14 are meshed with the second tooth grooves 19, so that the wheel carrier 1 and the steering seat 10 are locked. Further, the first end of the operating handle 31 is connected with the cable 21, the second end of the operating handle 31 is a holding end of the hand, the rotation point or the hinge point of the operating handle 31 and the walking frame 30 is arranged between the first end and the second end of the operating handle 31, and the rotation point or the hinge point is close to the first end of the operating handle 31, so that a labor-saving lever is formed, that is, when the medical record cart is used, the hand only needs to apply a relatively small force to the operating handle 31, so that the elastic force of the second elastic piece 17 in the caster can be overcome and compressed, and the brake of the caster is further realized.

Specifically, when a pulling force is applied to the cable 21, the second guide post 15 connected to the cable 21 moves backward along the second connection portion 12 toward the first connection portion 11 against the elastic force of the second elastic member 17 under the pulling force; at this time, the first elastic member 16 is no longer subjected to the elastic force of the second elastic member 17, that is, the first elastic member 16 in a compressed state is restored under the self elastic potential energy at this time, so as to push the first guide post 14 to move towards the first connecting portion 11, and meanwhile, the first guide post 14 drives the rocker arm 6 to swing, so that the brake pin 8 on the rocker arm 6 is disengaged from the first tooth slot 9 in the brake drum 7, that is, the brake on the wheel body 2 is released; further, as the second guide post 15 continues to move toward the first connecting portion 11, the teeth 20 on the second guide post 15 are disengaged from the second tooth slots 19 on the first guide post 14; that is, the wheel body 2 can now rotate freely, i.e. walk, relative to the wheel carrier 1; at the same time, the wheel carrier 1 can also be turned freely, i.e. turned, relative to the first connection 11 or the second connection 12 in the steering mechanism 5. Conversely, when the force applied to the cable 21 is removed, the second elastic member 17 in a compressed state starts to return (extend) and pushes the second guide post 15 to move toward the first guide post 14 and form an abutment with the first guide post 14, and since the elastic coefficient of the second elastic member 17 is greater than that of the first elastic member 16, that is, the elastic force of the first elastic member 16 is smaller than that of the second elastic member 17, the second elastic member 17 continues to push the first guide post 14 and compress the second elastic member 16; meanwhile, the first guide post 14 moves away from the first connecting part 11 and drives the rocker arm 6 to swing until the brake pin 8 on the rocker arm 6 is clamped in the first tooth groove 9 of the wheel body 2, so that the wheel body 2 is in a non-rotatable state relative to the wheel frame 1, namely, is braked; meanwhile, after the second guide post 15 is abutted with the first guide post 14, the convex teeth 20 on the second guide post 15 are clamped in the second tooth grooves 19 of the first guide post 14 (form engagement), so that the wheel carrier 1 cannot rotate relative to the second connecting portion 12 or the first connecting portion 11, namely, the steering function of the caster 32 is locked.

In the preferred embodiment, as shown in fig. 5-6, two wheels 2 are provided, the wheels 2 are respectively mounted on two sides of the wheel frame 1, a containing cavity is formed between the wheels 2 and the wheel frame 1, and the driving mechanism 3 and the braking mechanism 4 are both located in the containing cavity. The two wheel bodies 2 can enable the castor 32 to have better bearing capacity, and the driving mechanism 3 and the braking mechanism 4 are placed in the accommodating cavity to help to protect the driving mechanism 3 and the braking mechanism 4, so that the probability of failure or damage of the castor 32 caused by collision is avoided or reduced.

As shown in fig. 5-6, in the preferred embodiment, each wheel body 2 is provided with a brake drum 7, and both sides of a rocker arm 6 of the brake mechanism 4 are fixed with brake pins 8 which are matched with the brake drum 7; that is, each wheel body 2 can be braked, so that the phenomenon that the other wheel body 2 which is not braked can rotate or swing by taking the braked wheel body 2 as a fulcrum after only one wheel body 2 is braked is avoided, and the stability of the castor 32 after being braked is further improved; further, for example, when the casters 32 are used in a nursing bed, the stability of the nursing bed can be further improved and the shaking can be reduced when both wheels 2 can be braked.

As shown in fig. 7, in the preferred embodiment, the rocker arm 6 includes a first arm 22, a second arm 23, a third connecting portion 24, and a fourth connecting portion 25, wherein the first ends of the first arm 22 and the second arm 23 are integrally formed, and the axes of the first arm 22 and the second arm 23 form an included angle of 70-90 degrees, for example, 75, 80, 85 degrees; further, the length of the first force arm 22 is greater than the length of the second force arm 23, and the third connecting portion 24 is located at the connection position of the first force arm 22 and the second force arm 23, that is, the third connecting portion 24 and the wheel carrier 1 form a rotational connection through a pin shaft; the brake pin 8 is fixed at the second end of the second force arm 23 in an integrally formed manner, the fourth connecting portion 25 is fixed at the second end of the first force arm 22, the fourth connecting portion 25 is in transmission connection with the driving mechanism 3, the fourth connecting portion 25 in this embodiment is connected with the first guide post 14 through a pin shaft, and a chute is further arranged on the fourth connecting portion 25 in this embodiment, that is, the fourth connecting portion 25 can slide a certain distance relative to the first guide post 14 in addition to rotating a certain angle relative to the first guide post 14. Because the length of the first force arm 22 is greater than that of the second force arm 23, and the third connecting portion 24 is located at the connection position of the first force arm 22 and the second force arm 23, the rocker arm 6 can form a labor-saving lever, that is, after the driving mechanism 3 inputs relatively small moment to the first force arm 22, relatively large moment can be output on the second force arm 23, and thus the engagement force between the brake pin 8 and the first tooth socket 9 can be ensured, that is, the reliable brake of the caster 32 is ensured. Further, after the axes of the first force arm 22 and the second force arm 23 form an included angle, the length of the first force arm 22 is greater than that of the second force arm 23, so that the gravity center on the rocker arm is biased to the first force arm 22, that is, the first force arm 22 sags due to gravity and drives the second force arm 23 to lift upwards, and the brake pin 8 can be clamped in the first tooth slot 9; that is, in extreme cases, after the driving mechanism 3 loses control of the rocker arm 6, the casters 32 can still be in a stopped state, thereby allowing the care bed to be in a stable state, i.e. improving the safety of use of the casters 32.

As shown in fig. 5-6 and 8, in the preferred embodiment, the wheel side of the wheel body 2 is provided with an annular groove 27, the wheel carrier 1 is provided with a first baffle 28 which is matched with the groove 27, and the end of the first baffle 28 is placed in the groove 27 relative to the axial direction of the wheel body 2, and the first baffle 28 is not in contact with the wheel body 2. The first baffle plate 28 extends along the circumferential direction of the groove 27 and at least fills part of the groove 27, the first baffle plate 28 in this embodiment is in a major arc, and the first baffle plate 28 is located at the bottom of the wheel frame 1, that is, the first baffle plate 28 is close to the wheel surface of the wheel body 2, wherein the "wheel surface" refers to the circumferential surface of the wheel body 2 which contacts the ground during rolling, and the wheel body 2 can rotate relative to the first baffle plate 28. Specifically, by providing the first baffle 28 (in an arc shape or a ring shape) on the wheel frame, and simultaneously providing the groove 27 on the wheel side of the wheel body, which is matched with the first baffle 28, further, the end of the first baffle 28 is placed in the groove 27; that is, in the axial direction, the gap between the wheel body and the wheel frame is sealed or wrapped by the first baffle 28, and when the wheel body 2 of the caster brings up foreign matters such as hair in the rolling process, the first sweeping plate 28 can form a barrier to the foreign matters such as hair, thereby avoiding the foreign matters such as hair from winding on the wheel shaft 26, further causing the problems of increased rolling resistance of the caster, easy occurrence of seizing, abrasion, easy occurrence of bacteria breeding, increased risk of cross infection and the like.

Further, in another embodiment (not shown), the wheel side of the wheel body 2 is provided with a first baffle 28 having a ring shape, and the first baffle 28 can only be provided in a ring shape at this time because the wheel body 2 rotates relative to the wheel frame 1; further, the first baffle 28 and the wheel body 2 are fixed by clamping, bolting or integrally forming, at this time, a groove 27 matching with the first baffle 28 is provided on the wheel frame 1, the end of the first baffle 28 is placed in the groove 27 relative to the axial direction of the wheel body 2, the groove 27 at least covers part of the first baffle 28 relative to the circumferential direction of the first baffle 28, and the first baffle 28 can rotate relative to the wheel frame 1. Similarly, the gap between the wheel body 2 and the wheel frame 1 (shaft end) is blocked or sealed by the first baffle 28, so that foreign matters such as hair wires and the like can be prevented from being wound on the wheel shaft 26, further the rolling resistance of the caster is increased, and the problems of blockage, abrasion, easy bacteria breeding, increased risk of cross infection and the like are easily caused.

In a preferred embodiment, as shown in fig. 4-6, the first stop 28 is positioned coaxially with the axle 26 such that the end of the first stop 28 engages and rotates relative to the recess 27 in the wheel body 2. Further, when the first baffle 28 is close to the wheel surface of the wheel body 2 and the first baffle 28 is close to the wheel surface of the wheel body 2, the diameter of the first baffle 28 is relatively larger, and in extreme cases, even if the caster wheels are still wrapped with the head, the hair is often wrapped on the first sweeping plate 28, and the wound hair and other foreign matters are relatively easier to clean due to the relatively larger diameter of the first baffle 28. Further, when the first baffle 28 fills part of the groove 27, the first baffle 28 is positioned at the bottom of the wheel frame 1; the first baffle 28 is located relatively closer to the ground when the bottom of the wheel frame 1 is located, and the first sweeping plate 28 is arranged at the position to isolate foreign matters such as hair more easily and prevent the foreign matters from being wound on the casters.

As shown in fig. 4-6, in the preferred embodiment, the wheel carrier 1 is further provided with a second baffle 29, the second baffle 29 is located above the wheel body 2 and covers the wheel body 2, the second baffle 29 is fixedly connected with the wheel carrier 1, and in this embodiment, a second cleaning plate 29 is integrally formed with the wheel carrier 1; furthermore, the second baffle 29 is arranged to shield the gap between the wheel body 2 and the wheel frame 1 from above relative to the caster wheel, so as to prevent or reduce dust from accumulating on the wheel shaft 26 during long-term use of the caster wheel, that is, dust from accumulating on the upper surface of the second cleaning plate 29 during use of the caster wheel, so that cleaning is relatively easy.

In this specification, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description of the terms "preferred embodiment," "further embodiment," "other embodiments," or "specific examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. The utility model provides a from running gear of stopping, its characterized in that: the automatic braking device comprises a walking frame, an operating handle and a plurality of casters, wherein the casters are respectively fixed on the periphery of the bottom of the walking frame, the casters form a support for the walking frame, the operating handle is rotatably connected with the walking frame through a pin shaft, the casters comprise wheel frames, wheel bodies, driving mechanisms and braking mechanisms, the wheel bodies are connected with the wheel frames, the wheel bodies can rotate relative to the wheel frames, the wheel frames are connected with the walking frame, the driving mechanisms and the braking mechanisms are all installed on the wheel frames, the driving mechanisms are in transmission connection with the braking mechanisms, the braking mechanisms are mutually matched with the wheel bodies, the driving mechanisms of the casters are in transmission connection with the operating handle, and after the driving mechanism applies driving force to the operating handle, the driving mechanisms drive and enable the braking mechanisms to release braking of the wheel bodies, or after the driving force applied to the operating handle is removed, the driving mechanisms reset and drive the braking mechanisms to brake the wheel bodies.

2. The self-braking running gear according to claim 1, wherein: the walking frame is any one of a nursing bed walking frame, a trolley walking frame and a seat walking frame.

3. The self-braking running gear according to claim 1, wherein: the caster also comprises a steering mechanism, the wheel frame is connected with the steering mechanism, the wheel frame can rotate relative to the steering mechanism, and the driving mechanism is matched with the steering mechanism;

4. A self-braking running gear according to any one of claims 1-3, characterized in that: the brake mechanism comprises a rocker arm, a brake drum and a brake pin, the rocker arm is rotationally connected with the wheel frame, the brake pin is fixed at one end of the rocker arm, the other end of the rocker arm is connected with the driving mechanism, the brake drum is fixed on the wheel body, and when the brake mechanism is in a brake state, the brake pin is abutted against the inner wall of the brake drum;

5. A self-braking running gear according to claim 3, wherein: the steering mechanism comprises a first connecting part and a second connecting part, the first connecting part is fixedly connected with the second connecting part, the first connecting part is used for connecting external equipment, the second connecting part is connected with the wheel frame, and the second connecting part is connected with the driving mechanism.

6. The self-braking running gear according to claim 5, wherein: the driving mechanism comprises a first guide column, a second guide column, a first elastic piece and a second elastic piece, wherein the first guide column is in sliding connection with the wheel frame, one end of the first elastic piece is propped against the wheel frame, the other end of the first elastic piece is propped against the first end of the first guide column, the second end of the first guide column is propped against the first end of the second guide column, the second end of the second guide column is in sliding connection with the second connecting part, one end of the second elastic piece is propped against the second guide column, and the other end of the second elastic piece is propped against the wheel frame;

7. The self-braking running gear according to claim 6, wherein: the driving mechanism further comprises a guy cable, one end of the guy cable is rotationally connected with the second guide post, the second end of the guy cable is connected with the operating handle, and the guy cable is used for driving and enabling the second guide post and enabling the convex teeth to be separated from the second tooth grooves on the first guide post relative to the axial direction of the first guide post or the second guide post;

8. The self-braking running gear according to claim 6 or 7, characterized in that: the elastic coefficient of the second elastic piece is larger than that of the first elastic piece, after the driving force applied to the driving mechanism is removed, the second elastic piece pushes and enables the second guide post to be abutted to the first guide post, the second guide post is meshed with the convex teeth on the first guide post and the second tooth grooves, and the wheel frame is locked with the steering seat.

9. The self-braking running gear according to claim 4, wherein: the rocker arm comprises a first force arm, a second force arm, a third connecting part and a fourth connecting part, wherein the first end of the first force arm is fixedly connected with the first end of the second force arm, an included angle is formed between the axes of the first force arm and the second force arm, and the length of the first force arm is larger than that of the second force arm;

10. The self-braking running gear according to any one of claims 1 to 3, 5 to 7, characterized in that: the wheel frame is provided with a first baffle which is matched with the groove, the end part of the first baffle is arranged in the groove relative to the axial direction of the wheel body, the first baffle extends along the circumferential direction of the groove and at least fills part of the groove, and the wheel body can rotate relative to the first baffle;