KR101982323B1

KR101982323B1 - Brake unit for wheelchair

Info

Publication number: KR101982323B1
Application number: KR1020170060599A
Authority: KR
Inventors: 이일열
Original assignee: 이일열
Priority date: 2017-05-16
Filing date: 2017-05-16
Publication date: 2019-05-24
Also published as: KR20180125809A; WO2018212492A1

Abstract

The present invention provides a brake unit for a wheelchair that provides a function of a backlash prevention device that controls the reverse travel of a large wheel in addition to a brake for braking a large wheel of a wheelchair and allows the user to easily operate them.
To this end, according to the present invention, a mounting bracket for mounting to a frame of a wheelchair; A backlash preventing device provided on the mounting bracket and operated by an operation of a lever handle to release braking force when the wheel of the wheelchair is innocent, And a toggle brake which is mounted on the mounting bracket and which is actuated by the operation of the brake handle to brake the large wheel of the wheelchair.

Description

[0001] BRAKE UNIT FOR WHEELCHAIR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake unit for a wheelchair, and more particularly, to a brake unit for a wheelchair in which a brake for controlling a large wheel is applied as a toggle brake applying a four-bar link, And to a brake unit for a wheelchair which enables them to be easily operated by a user.

A wheelchair is a chair with a large wheel and a caster (front auxiliary wheel) so that the patient, elderly person with disabilities, or the disabled can move with ease.

The type of wheelchair is generally classified into a manual type in which a user rotates the wheel directly by the user depending on the driving method of the wheel, and an electric type in which the wheel rotates by the rotational force of the motor. Particularly in the case of a hand wheelchair, To be folded or unfolded.

1, a conventional manual wheelchair includes a frame 17 having a seat 11 and a backrest 12, a handle 13 and an armrest 16 on a frame 17, A wheel rim mounted on the outside of the large wheel 20 and a caster 21 mounted on both sides of the frame 17 to adjust the traveling direction of the large wheel 20, A foot plate 18 mounted on the front side of the frame 17 and a brake 25 mounted on both the right and left sides of the frame 17 to slow down or stop the rotation speed of the large wheel 20. [

Here, the brake 25 is made by a combination of a plurality of links and is fixed to a specific position of the frame 17 so as to perform a limited movement.

In the conventional hand wheelchair, the protector or the caregiver may push or move the handle 13, or the user may manually move the wheel handle back and forth while the user is on the wheelchair, and the large wheel 20 may be rolled and moved. The moving speed can be reduced or stopped by actuating the motor 25.

However, when the user (occupant) is on the flat ground, it is easy to operate the brake 25, but if the hand is in the middle of climbing up the ramp such as an uphill road or a sloping road, There is a problem of backing back before.

In other words, when the user rotates the wheel knob, the user must turn the wheel knob instantaneously instantaneously. Therefore, when the weak person such as the elderly person misses the handle of the wheel, the wheelchair becomes rough There is a considerable risk of causing safety accidents such as falling or falling by being pushed by the backlash that slips down to the low side.

In order to solve such a problem that such a conventional manual wheelchair tends to back up during a climb uphill, a non-slip device for a wheelchair has been disclosed, for example, in Korean Utility Model Registration No. 20-0475891. This is because the stopper is rotatably attached to the back of the big wheel and it is connected with the handle and the wire. When the handle is pulled, the stopper falls from the ground. When the handle is released, the stopper is returned to the original position, It is possible to prevent the vehicle from reversing at the time of stopping the vehicle or when starting from the ramp.

KR 20-0116164 Y1 (1993.05.24) KR 20-0161937 Y1 (September 09, 1999) KR 10-0859327 B1 (2008.09.12) KR 10-1406496 B1 (2014.06.03) KR 20-0475891 Y1 (2015.01.05)

Accordingly, the present inventor has focused on solving the limitations and problems of existing wheelchair brakes in consideration of the above-mentioned matters in a comprehensive manner, so that the user can selectively use the brake function and the backlash prevention function selectively, When the wheels turn smoothly, the braking force is automatically released and does not interfere with the rolling. When the wheel is reversed, it is automatically braked to prevent the wheelchair from being reversed when stopped at the ramp or when starting from the ramp. As a result, the inventors of the present invention have invented the present invention as a result.

Herein, the technical object and object to be solved by the present invention are not limited to the technical object and purpose mentioned above, and another technical object and purpose not mentioned can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a wheelchair comprising: a mounting bracket for mounting to a frame of a wheelchair; a mounting bracket attached to the mounting bracket and operable by operation of a lever handle; A reverse rotation preventing device for braking at the time of backward rotation and a driving device for driving the large wheel of the wheelchair by being operated by the operation of the braking handle so that the large wheel of the wheelchair is braked The present invention provides a brake unit for a wheelchair, characterized in that a toggle brake is incorporated in one module.

Thus, the present invention can selectively and easily operate the brake function and the backlash prevention function without lifting the arm from the armrest while the user is aboard the wheelchair.

An embodiment of the present invention having the means and structure for solving the above object and the technical object of the present invention is to arrange the brake and the anti-reverse device in one unit so as to be ergonomic and easy to recognize, It is possible to selectively operate the brake function and the backlash prevention function without removing the arm from the armrest, thereby reducing malfunctions.

Further, according to another embodiment of the present invention, when the wheel of the wheelchair is innocent, the braking force is released so that it does not interfere with the rolling. When the wheelchair is stopped on the ramp or when the ramp starts It can be surely prevented from being reversed.

Accordingly, it is possible to prevent a safety accident such as a falling accident or a falling (overturning) accident that a wheelchair user (passenger) falls off a wheelchair due to a backlash that the wheelchair slides or pushes back while the user is climbing the ramp.

In addition, the toggle brake and the anti-backlash device for controlling a large wheel in one module are installed, which can simplify the operation of the user and greatly reduce the economic cost.

Here, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is an exemplary view showing a conventional wheelchair.
2 is a side view showing a state in which a wheelchair brake unit according to an embodiment of the present invention is mounted on a wheelchair.
Fig. 3 is an enlarged view showing the locality of Fig. 2;
4 is a perspective view showing a brake unit for a wheelchair according to an embodiment of the present invention.
5 is a partially enlarged side view showing a state in which the toggle brake is locked and the backlash preventing device is in an inactive state, in the brake unit for a wheelchair according to the embodiment of the present invention.
6 and 7 are local enlarged side views of the brake unit for a wheelchair according to the embodiment of the present invention, in which the toggle brake is deactivated and the backlash prevention device is locked.
8 is a perspective view illustrating a backlash preventing device constituting a brake unit for a wheelchair according to an embodiment of the present invention.
Fig. 9 is an exploded view showing the backbreak prevention device for a wheelchair brake unit according to the embodiment of the present invention.
10 is a state view showing a mounting bracket on which the toggle brake and the anti-reverse device according to the present invention are installed.
11 to 13 are use state diagrams illustrating the braking principle according to the embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described more specifically with reference to the accompanying drawings.

Prior to this, the following terms are defined in consideration of the functions of the present invention, and they are to be construed to mean concepts that are consistent with the technical idea of the present invention and interpretations that are commonly or commonly understood in the technical field of the present invention.

In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In addition, when a part includes an element, it does not exclude other elements unless specifically stated otherwise, but may include other elements.

A wheelchair brake unit according to an embodiment of the present invention includes a mounting bracket 110, a toggle brake 150, and a backlash preventing device 200. [

The mounting bracket 110 is provided so as to be easily mounted on the frame F of the wheelchair (see FIGS. 2 and 10)

Here, the mounting bracket 110 may be placed at a predetermined mounting position of the wheelchair frame F and fixed and joined by a method such as bolting or welding.

The toggle brake 150 is for generating a braking force necessary for decelerating, holding, stopping or holding the wheelchair at a certain position. The toggle brake 150 is operated by the operation of the braking handle 151, W on the mounting bracket 110.

Here, the toggle brake 150 can be fixed and joined to the mounting bracket 110 by a method such as bolting or welding.

In addition, the toggle brake 150 may adopt a structure in which a plurality of links are combined so that the toggle brake 150 is fixed to the mounting bracket 110 and performs a limited movement.

5 and 11, the toggle brake 150 is brought into close contact with the large wheel W of the wheelchair by the operation of the brake handle 151, so that the large wheel W of the wheelchair stops moving do.

The general structure and operation principle of the toggle brake 150 are exemplified in Patent Documents 1 and 2, and therefore a detailed description thereof will be omitted.

The backlash preventing device 200 is operated by the operation of the lever handle 212 so that the braking force is released so as not to interfere with rolling when the wheel W is innocent, ).

That is, the anti-backlash device 200 has a four-bar linkage structure for restraining the large wheel W of the wheelchair from moving backward according to the operation of the lever handle 212 of the wheelchair user.

The anti-backlash device 200 is disposed and installed on the mounting bracket 110 so as not to interfere with the trajectory of the toggle brake 150, as shown in FIGS. 3 and 10.

The backlash preventing device 200 includes a main section 210, a follower 220, a coupler 230, a brake shoe 240, a stopper 250, first and second springs 260 and 270 (See Figs. 8 and 9)

The main shaft 210 is pin-jointed by the mounting bracket 110 and the first shaft pin 211 so as to rotate at a predetermined angle about the first shaft pin 211 by the operation of the lever handle 212, Respectively.

That is, the main rotor 210 is rotatable about a first axis pin 211 in a predetermined angular range.

Here, the first shaft pin 211 is formed on the outer periphery of the first shaft pin 211 with a sleeve that freely rotates without restraint, so that smooth rotation of the main shaft 210 relative to the mounting bracket 110 It is possible to prevent the risk that the user's hand or the like directly touches or curls the first shaft pin 211 during use.

The follower 220 is rotated by the mounting bracket 110 and the second shaft pin 221 to rotate in synchronization with the rotation of the main shaft 210 at a predetermined angle about the second shaft pin 221, joint.

The left and right ends of the follower 220 are formed to selectively interfere with both sides of the main section 210 so that the main section 210 rotates within a predetermined angle.

That is, when the lever handle 212 is operated to change the direction of the backlash preventing device 200, the follower 220 is rotated about the first axis pin 211 at a predetermined angle range So that the rotation can be easily carried out.

The coupler 230 rotates the main shaft 210 in such a manner that the follower 220 interlocks with the main shaft 210 and maintains the state in which the follower 220 is rotated at a predetermined angle around the second shaft pin 221 And the follower 220 are connected at both ends by a pin joint.

That is, the coupler 230 serves as a link and a link for connecting the follower 220 to the main shaft 210 so that the follower 220 has a constant movement.

The brake shoe 240 is for generating a braking force necessary for holding and stopping the large wheel W of the wheelchair and has one end thereof operated by the operation of the lever handle 212, And the other end (opposite side) thereof is selectively in close contact with the large wheel W of the wheelchair to cause friction, so that the first wheel holding and pads 242 for stopping are mounted.

Here, when the brake shoe 240 is operated in a state of holding and stopping the large wheel W of the wheel chair, the pad 242 is brought into contact with the large wheel W of the wheel chair to achieve a stable braking force, The position of the third shaft pin 241 connecting the brake shoe 240 with the follower 220 is the same as the position of the first shaft pin 211 connecting the main shaft 210 to the mounting bracket 110, And is formed at a position lower than the second axis pin 221 connecting the follower 220 with the mounting bracket 110. [

It is preferable that the pad 242 is fastened to the brake shoe 240 by a method such as bolting so that the pad 242 can be easily replaced when the service life is short.

The stopper 250 is provided on the third pin shaft 241 so that the brake shoe 240 contacts the brake shoe 240 when the brake shoe 240 rotates about the third pin shaft 241 in the reverse direction of the wheel- The lower part is attached to the edge.

That is, when the large wheel W of the wheelchair rotates in the backward direction, the stopper 250 keeps the pad 242 of the brake shoe 240 in close contact with the large wheel W of the wheelchair, Is prevented from rotating more than a predetermined angle around the third pin shaft 241 to prevent the large wheel W of the wheelchair from rotating in the backward direction.

The first spring 260 is compressed during rotation of the main shaft 210 by the locking operation of the lever handle 212 and then is returned to the returning force when the main lever 210 is rotated by the unlocking operation of the lever handle 212 So as to rotate the main rotor 210 and the follower 220 to their original positions.

That is, the first spring 260 is inserted into the second shaft pin 221 such that the center of the first spring 260 is compressed and decompressed according to the rotation of the main shaft 210, (Not shown).

The second spring 270 compresses the brake shoe 240 when the wheel shoe 240 rotates in the innocent direction of the wheelchair large wheel W about the third axis pin 241 and the large wheel W of the wheelchair is rotated in the reverse direction The brake shoe 240 performs an elastic action to rotate the brake shoe 240 back to its original position by the returning force.

In other words, the second spring 270 is centered on the third shaft pin 241 so as to maintain the compression and decompression state in accordance with the rotation of the brake shoe 240 about the third axis pin 241, Is coupled to the stopper (250) and the brake shoe (240).

Here, the first and second springs 260 and 270 preferably use a torsion coil spring that provides a repulsive force against a load applied by elastic deformation. However, the present invention is not limited thereto. For example, , Any one having the same action and effect as to resist the force to be compressed may be used.

The backlash preventing device 200 includes a third shaft pin 241 formed on one end of the fourth clutch link 220 and a third shaft pin 241 formed as a rotation shaft of the brake shoe 240 The brake shoe 240 may be provided to rotate around the center.

Before the brake shoe 240 reaches a virtual line connecting the center of rotation of the wheelchair large wheel W and the center of rotation of the brake shoe 240 horizontally, 250) can be located (see Figures 10 and 11)

When the brake shoe 240 contacts the large wheel W of the wheelchair, the tangential direction of the large wheel and the point at which the brake shoe 240 and the brake shoe 240 contact the large wheel W of the wheelchair, May be formed to have an acute angle with respect to each other (Figs. 12 and 13)

It may be formed to have a backlash until the brake shoe 240 comes into contact with the stopper 250 from when the brake shoe 240 contacts the large wheel W of the wheelchair to smoothly rotate and operate the brake shoe 240 (See Fig. 13)

The main operation and the operation principle of the brake unit for a wheelchair according to the embodiment of the present invention will be described as follows.

5, when the large wheel W of the wheelchair is stopped or when the braking operation is performed, the toggle brake 150 can keep the large wheel W of the wheelchair in a locked state by the operation of pushing or pulling the brake handle 151 have.

When the lever handle 212 of the backlash preventing device 200 is pushed outward and is operated to be in the released state when the vehicle is traveling on a flat surface or the like in a wheelchair, the main shaft 210 is rotated about the first shaft pin 211 So that it is possible to achieve a state in which the operation is released by rotating naturally.

6 and Fig. 13, when the lever handle 212 is pulled toward the large wheel W and is operated to be switched to the operating state, the main shaft 210 is rotated by the first shaft pin 211 The pad 242 of the brake shoe 240 can be in close contact with the large wheel W. [

The brake shoe 240 rotates in the forward direction naturally around the third shaft pin 241 due to the action of the force when the large wheel W of the wheelchair is innocent, It does not interfere with full rearrangement.

On the other hand, when the wheelchair is traveling on the ramp while the brake shoe 240 of the backlash preventing device 200 is set to the position for braking, when the large wheel W of the wheelchair is reversed, The pad 242 is brought into close contact with the large wheel W as shown in FIG. 13, and when the wheel 242 is continuously reversed by the weight of the wheelchair, the pad 242 rotates about the third axis pin 241 So that the brake shoe 240 is stopped by the stopper 250 to prevent the reverse rotation of the large wheel W. [

At this time, if the large wheel W rotates forward, the brake shoe 240 rotates around the third axis pin 241, and the brake shoe 240 moves away from the stopper 250, As shown in Fig. Therefore, the wheelchair can be forwardly traveled without being reversed while repeating the stopping and traveling at the time of running on the slope.

That is, when the wheelchair is moved in the innermost direction, the braking force of the reverse-rotation preventing device 200 is released, thereby preventing the wheelchair from unintentionally sliding back and forth during the ascending of the ramp, Is stopped by the stopper 250 while being rotated around the third axis pin 241 while being in contact with the large wheel W. Thus, It is possible to prevent a safety accident such as a fall or a rollover accident in which a wheelchair user falls down.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments or constructions. Various changes and substitutions may be made without departing from the spirit and scope of the invention. It will be obvious to those skilled in the art that the present invention can be widely applied to other embodiments.

Therefore, it is to be understood that modifications and variations of the features of the present invention are intended to be included within the spirit and scope of the present invention.

110: Mounting bracket 150: Toggle brake
151: Brake handle 200: Reverse rotation prevention device
210: main section 211: first axis pin
212: lever handle 220:
221: second shaft pin 230: coupler
240: Brake shoe 241: Third axis pin
242: Pad 250: Stopper
260: first spring 270: second spring
F: wheelchair frame W: big wheel

Claims

Mounting brackets for mounting in wheelchair frames;
When the large wheel of the wheelchair is innocent, the braking force is released so as not to interfere with the rolling. In the reverse rotation, the wheel is turned in a predetermined section while being in contact with the large wheel, A backlash preventing device for maintaining the backlash; And
A toggle brake mounted on the mounting bracket and actuated by an operation of a brake handle to brake a large wheel of the wheelchair;
And a parking brake unit for a wheelchair.

The method according to claim 1,
The reversing prevention device includes a main bracket that is connected to one end portion of the mounting bracket by a first joint pin pin and is rotated at a predetermined angle about the first axis pin by the operation of the lever handle, ;
And the second bracket is connected to the mounting bracket by a pin joint by means of a second bracket pin so that the bracket is rotated by a predetermined angle around the second bracket pin in accordance with the rotation of the main bracket, Optionally, causing interference;
Both ends of the main section are connected to the main section in a pin joint so that the main section and the tail section are interlocked with each other so that the tail section is rotated at a predetermined angle around the second shaft pin A coupler;
One end and one end of the slave are connected to each other by a pin joint by a third axis pin and the other end (opposite side) of the slave is connected to a wheel which is selectively in contact with the wheel wheel's large wheel, Brake shoe;
And the brake shoe is brought into contact with the brake shoe when the brake shoe is rotated in the reverse direction of the large wheel of the wheelchair about the third axis pin so that the pad is in close contact with the large wheel of the wheelchair A stopper to keep it;
The lever handle is compressed during rotation of the main lever by the locking operation of the lever handle, and is elastically operated to rotate the main lever and the follower by the returning force when the main lever is rotated by the unlocking operation of the lever handle A first spring; And
When the brake shoe is compressed when rotating in the innermost direction of the wheelchair large wheel about the third axis pin, and when the large wheel of the wheelchair switches the direction in the backward direction, the elastic force that rotates the brake shoe originally by the returning force A second spring for applying a spring force;
And a parking brake unit for a wheelchair.

3. The method of claim 2,
Wherein the pad end of the brake shoe rotates about the third axis pin and contacts the large wheel, and is pivoted by the stopper while being turned for a predetermined interval.