KR101982319B1

KR101982319B1 - Wheel slip prevention device for wheelchair

Info

Publication number: KR101982319B1
Application number: KR1020170060667A
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: KR20180125837A; WO2018212515A1

Abstract

The present invention is intended to provide an anti-reverse device for a wheelchair which can prevent a large wheel of a wheelchair from slipping or being pushed back from a ramp.
To this end, in the present invention, the braking force is naturally loosened so that the large wheel of the wheelchair does not interfere with rolling when the wheelchair is innocent while the wheelchair is running on a slope, and on the contrary, when the wheelchair is automatically stopped by the large wheel of the wheelchair, Disclosed is a backlash preventing device for a wheelchair having a structure capable of preventing backward slipping or pivoting when starting from a ramp.

Description

WHEEL SLIP PREVENTION DEVICE FOR WHEELCHAIR BACKGROUND OF THE INVENTION [0001]

More particularly, the present invention relates to an anti-backlash device for a wheelchair, and more particularly, to an anti-backlash device for a wheelchair that automatically brakes a large wheel of a wheelchair when the wheelchair is running on an inclined road and automatically slides back when the wheelchair is stopped on a ramp, To prevent a backlash preventing device for a wheelchair.

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.

This is because it is easy to operate the brake 25 while the user (passenger) is running on the flat ground, but while raising the ramp such as an uphill slope or a sloping road, it is necessary to hold the wheel grip with one hand and operate with the other hand, There is a problem in that the wheel grip which is held is missed, and thus the brake wheel 25 is reversed before the brake 25 is operated.

In other words, since the user must temporarily hold the brake 25 in the state where the wheel is turned up and forward, and then turn the wheel knob again, it is hard and difficult. In this process, If the hand holding the handle is missed, the wheelchair is pushed by the backlash which slides down to the lower side, and there is a considerable risk of causing safety accidents such as falling or falling.

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.

However, this structure still requires the user (passenger) to hold the wheel handle with one hand while operating the uphill ramp, and operate with the other hand, which makes the operation considerably troublesome and troublesome, There are many limitations in the use inconvenience that the operation of pulling the handle must be repeated every time.

It is to be understood that the above-described techniques are intended to assist the understanding of the present invention, and are not to be construed as meaning that the present invention is well known in the art to which the present invention belongs.

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 intensively solved the limitations and problems of existing wheelchair brakes by taking the above-mentioned matters into consideration in a comprehensive manner, and automatically releases the braking force when the wheel of the wheelchair turns in a forward direction It is possible to prevent the wheelchair from slipping or being pushed when the wheelchair is stopped at the ramp or when starting from the ramp, thereby preventing reverse rotation of the wheelchair in a new structure As a result, the inventors invented the present invention as a result of constant efforts to develop devices.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a wheelchair reversing prevention device for a wheelchair that prevents braking when a large wheel of a wheelchair is innocent, In order to solve the problem.

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 main joint which is connected by a pin joint and rotates at a predetermined angle around the first axis pin by the operation of a lever handle and a main joint which is connected to the mounting bracket by a pin joint by the second axis pin, A follower which rotates in conjunction with the second axis pin at a predetermined angle in accordance with the rotation of the main shaft and which causes the main section to rotate within a certain angle and which causes selective interference between the main section and the follower; Both ends of the main shaft are connected to the main shaft in a pin joint, and the follower shaft is rotated at a predetermined angle around the second shaft pin And a pinion joint connected at one end and the other end of the slave by a third axis pin and a large wheel of the wheelchair at the other end The brake shoe is provided at the lower edge of the follower so that the brake shoe contacts the brake shoe when the brake shoe rotates in the direction of the large wheel of the wheelchair about the third axis pin. A stopper for maintaining the state in which the pad is in close contact with a large wheel of the wheelchair; and a return force when the main lever is rotated by the unlocking operation of the lever handle when the main lever is rotated by the locking operation of the lever handle, A first spring that elastically acts to rotate the main moving segment and the follower segment to their original positions by the first spring, When the wheel is rotated in the innocent direction of the large wheel of the wheelchair about the third axis pin, and the large wheel of the wheelchair is switched in the direction of the backward direction, the elastic force of the brake shoe 2 springs are incorporated in the wheelchair.

Thus, the present invention can be applied to a wheelchair which is operated by the operation of a lever handle to release the braking force when the wheel of the wheelchair is innocent and does not interfere with rolling, and automatically brakes when the wheelchair is in reverse, Can be prevented.

According to an embodiment of the present invention, which has the means and structure for solving the above-mentioned object and the technical object, when the wheel of the wheelchair is innocent, the braking force is released naturally and does not interfere with the rolling, , It is possible to prevent the wheelchair from being reversed at the time of stopping on the ramp or when starting from the ramp.

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.

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 is mounted on a wheelchair according to an embodiment of the present invention.
3 is a perspective view illustrating a backlash preventing device for a wheelchair according to an embodiment of the present invention.
Fig. 4 is a perspective view explaining Fig. 3 in an exploded manner.
5 is a partially enlarged side view showing a state in which the anti-reverse device for a wheelchair according to the embodiment of the present invention is inactivated.
FIG. 6 is a partial enlarged side view showing a state in which a large wheel of a wheelchair is innocently moved in an operating state of the anti-reverse device for a wheelchair according to the embodiment of the present invention.
FIG. 7 is a partially enlarged side view showing a state in which a large wheel of a wheelchair reverses in an operating state of a backrest device for a wheelchair according to an embodiment of the present invention.
8 to 13 are local enlarged side views for explaining the operating state of the anti-reverse device for a wheelchair 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.

As shown in FIGS. 2 to 7, when the wheel W of the wheelchair is innocently operated by the operation of the lever handle 212 of the wheelchair user according to the embodiment of the present invention, And is mounted on the mounting bracket 200 so as to prevent the large wheel W of the wheelchair from being restrained automatically when the vehicle is reversely rotated.

This includes a mounting bracket 200, a main section 210, a follower 220, a coupler 230, a brake shoe 240, a stopper 250, and first and second springs 260 and 270 .

The mounting bracket 200 is provided so as to be easily mounted on the frame F of the wheelchair.

Here, the mounting bracket 200 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 main cutting edge 210 is pinned by the one end portion of the mounting bracket 200 and the first axis pin 211 so as to rotate at a predetermined angle around the first axis pin 211 by the operation of the lever handle 212 (pin joint).

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 200 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 connected to the pin joint 221 by the coupler 230 and the second shaft pin 221 so that the follower 220 rotates at a predetermined angle about the second shaft pin 221 as the main shaft 210 rotates. ).

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 reverse rotation prevention function, the main switch 210 is rotated about the first axis 211 in a predetermined angle range So that it 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 determined by the first shaft pin 211 connecting the main shaft 210 to the mounting bracket 200, And is formed at a lower position than the second axis pin 221 connecting the follower 220 with the mounting bracket 200. [

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 fixed to the first shaft pin 211 in the state where the center of the first spring 260 is inserted into the second shaft pin 221 so as to maintain the compressed and uncompressed state according to the rotation of the main shaft 210, And is coupled to the winter 220.

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.

That is, the second spring 270 is inserted in the third shaft pin 241 so that the center of the second spring 270 is held in the compressed and uncompressed state in accordance with the rotation of the brake shoe 240 about the third shaft pin 241 And both ends thereof are 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 main operation and principle of operation of the anti-backlash device for a wheelchair according to the embodiment of the present invention will be described below.

First, as shown in FIG. 2, the mounting bracket 200 may be fixed or joined to the frame F of the wheelchair by means of bolting, welding, or the like.

5, when the lever handle 212 is pushed outward and is operated to be in the released state, the main section 210 rotates naturally about the first axis pin 211 The operation can be released.

6, when the lever handle 212 is pulled toward the large wheel W and is operated to switch to the operating state, the main shaft 210 rotates about the center of the first shaft pin 211 The pad 242 of the brake shoe 240 can be brought into close contact with the large wheel W.

The brake shoe 240 rotates in the forward direction naturally around the third shaft pin 241 by the action of the force when the large wheel W of the wheelchair is innocent even in a state in which the braking force is set to the position for braking, And does not interfere with this full rearrangement.

On the contrary, when the wheelchair is running on the ramp while the brake shoe 240 is set to the braking position as shown in FIG. 7, when the large wheel W of the wheelchair is reversed, the brake shoe 240 is moved to the stopper 250 The pads 242 attached to the brake shoe 240 come into close contact with the large wheel W of the wheel chair to maintain the braking force stably without being rotated about the third axis pin 241 in the reverse direction, It can be prevented from being reversed at the time of stopping or when starting from the ramp.

That is, only when the wheelchair moves in the innocent direction, the braking force of the brake shoe 240 is released. As a result, the wheelchair slips back and slides back unintentionally while climbing the ramp, Can be prevented.

8-13, a third axis pin 241 is formed at one end of the follower 220 and the third axis pin 241 is connected to the third axis pin 241, And the brake shoe 240 may rotate about the rotation shaft of the brake shoe 240. [

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 may be located.

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 at an acute angle with respect to each other.

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 .

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.

200: Mounting bracket 210:
211: first axis pin 212: lever handle
220: a vertical axis 221: a second axis 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 wheels

Claims

Mounting brackets for mounting in wheelchair frames;
A main bracket connected to one end portion of the mounting bracket by a first joint pin pin joint and rotated at a predetermined angle around the first joint pin pin by operation of a 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;
Wherein the backrest is provided with an elastic member.

The method according to claim 1,
A third shaft pin is formed at one end of the slave rail and the brake shaft is rotated around the third shaft pin as a rotation shaft of the brake shoe.

3. The method of claim 2,
Wherein the stopper is positioned in the follower at the bottom of the hypothetical line before the brake shoe reaches a virtual line connecting the center of rotation of the wheelchair large wheel and the center of rotation of the brake shoe horizontally.

The method of claim 3,
The tangential direction of the large wheel when the brake shoe contacts the large wheel of the wheelchair and the virtual line direction connecting the rotation axis of the brake shoe and the point of contact of the brake shoe with the large wheel of the wheelchair, Device.

The method of claim 3,
And a backlash for smoothly rotating and actuating the brake shoes until the brake shoes come into contact with the stopper when the brake shoes come in contact with the large wheels of the wheelchair.