JPH05161674A - Arm rest attaching/detaching mechanism for wheelchair - Google Patents

Abstract

PURPOSE:To provide the arm rest attaching/detaching mechanism for a wheelchair, by which an arm rest can be attached and detached by a simple operation. CONSTITUTION:In the arm rest attaching/detaching mechanism for a wheelchair having an arm rest 5 provided vertically on a side frame 2, the arm rest 5 is provided with a front plug 10 having an axis in the roughly vertical direction in one end part, and a rear plug 20 being parallel to the axis of the front plug 10 in the other end part. Also, the side frame 2 is provided with a front arm joint 30 which can be engaged to the front plug 10 and a rear arm joint 40 which can be engaged to the rear plug 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armrest attaching / detaching mechanism for a wheelchair, which allows the armrest of the wheelchair to be easily attached and detached.

[0002]

2. Description of the Related Art Conventionally, an armrest of a wheelchair is formed by an arm pipe bent in an inverted L shape, an inverted U shape, etc., and is fixed to a side frame by welding or the like to be integrated. It was

[0003]

However, in such a conventional armrest for a wheelchair, the armrest is erected along the seat width corresponding to the physical constitution of the user due to the hand rim operation, so that When getting on and off, depending on the user, there was a problem that the armrest interferes with getting on and off.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an armrest attaching / detaching mechanism for a wheelchair in which the armrest can be attached / detached by a simple operation.

[0005]

The present invention is made to achieve the above object, and is an armrest attaching / detaching mechanism of a wheelchair having an armrest erected on a side frame, wherein the armrest comprises A front plug having a substantially vertical axis at one end, and a rear plug parallel to the axis of the front plug at the other end, the front plug having a front lock hole penetrating perpendicularly to the axis; An opening groove communicating with the front lock hole and having a width smaller than the diameter of the front lock hole and opening to the lower end of the front plug, and the rear plug is orthogonal to the axis thereof. The side frame is formed with a rear lock hole that is bored, and the side frame has a front arm joint engageable with the front plug, and a rear arm joint engageable with the rear plug,
The front arm joint has a front joint hole into which the front plug can be inserted, a large diameter portion slightly smaller than the diameter of the front lock hole, and a small diameter portion smaller than the width of the opening groove. A lock pin movably provided orthogonal to the axis of the front joint hole and biased in one direction,
A hook pin provided so as to be movable in the axial direction of the front joint hole and biased upward and abutting against the lock pin at an upper position to prevent the movement thereof, The rear arm joint is provided with a rear joint hole into which the rear plug can be inserted and has a long diameter in the front-rear direction, and a rear joint hole which is movable so as to be orthogonal to the axis of the rear joint hole and which is formed in the rear lock hole. And a slide pin that can be inserted,
This is an armrest attachment / detachment mechanism for a wheelchair characterized by the following features.

[0006]

The present invention is configured as described above, and when attaching the armrest, the front plug and the rear plug of the armrest are respectively attached to the front arm joint and the rear arm joint provided on the side frame. Insert at the same time.

At this time, the opening groove of the front plug is externally fitted to the small diameter portion of the lock pin of the front arm joint, and the lower end of the front plug presses the hook pin as it is pushed down, and the step difference between the hook pin and the large and small diameter portions. The lock pin movement prevention by the engagement with the section is released. With the release, the lock pin moves in one direction by the urging force, the large diameter portion enters into the front lock hole, the front arm joint engages with the front plug,
To lock.

In the rear plug, the slide pin is inserted into the rear lock hole in the rear joint hole of the rear arm joint to engage and lock the rear arm joint and the rear plug. This completes the attachment of the armrest to the side frame.

To remove the armrest, the slide pin of the rear arm joint is retracted from the rear lock hole to unlock the rear plug. Further, the lock pin of the front arm joint is pushed and moved in the other direction against the biasing force, and the small diameter portion is inserted into the front lock hole.

As a result, the hook pin moves upward by the urging force by the step difference between the large and small diameter portions and pushes up the front plug. With this pushing up, the opening groove passes through the small diameter portion and moves upward, and the lock of the forearm joint is released. Then, by pulling the arm joint upward, the front plug and the rear plug are pulled out from the front and rear arm joints, and the removal is completed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view of a wheelchair equipped with an armrest attaching / detaching mechanism of this embodiment.

In the figure, reference numeral 1 is a wheelchair, and the wheelchair 1 has side frames 2 which are symmetrically formed and arranged to face each other, and the left and right side frames 2 each have a front frame 3 at a front end thereof. They are fixed and connected by the folding mechanism 4. The side frame 2 includes a front arm joint 30 and a rear arm joint 40.
The armrest 5 having the front plug 10 and the rear plug 20 is erected via the. Main wheels 8 are pivotally mounted on the left and right side frames 2, and caster wheels 9 are pivotally mounted on the left and right front frames 3. In addition, the description of the following drawings will be made on the left side portion of the wheelchair 1, and the description of the symmetrical right side portion will be omitted.

The side frame 2 extends in the front-rear direction and has side pipes 2a and 2b which are parallel to each other in the upper and lower sides.
A rear pipe 2c that connects them and extends in a substantially vertical direction,
It is configured mainly with the joint pipe 2d.

In the embodiment, the armrest 5 includes, in the embodiment, a main pipe 5a extending in the front-rear direction, a front pipe 5b provided substantially parallel to each other in a front portion of the main pipe 5a, and a main pipe 5a being substantially hung at a rear portion thereof. It is composed of a rear pipe 5c provided in the shape of a circle. And, at the lower end of the front pipe 5b,
The front plug 10 is fixed to share the axis, and the rear plug 20 is fixed to the lower end of the rear pipe 5c to share the axis.

The front plug 10 has an engaging portion 11 having a surface facing the front-rear direction at the lower end portion. Engaging part 11
Has a front lock hole 12 penetrating perpendicularly to the axis of the front plug 10, and further communicates with the lower portion of the front lock hole 12 and has a width smaller than the diameter of the front lock hole 12. An opening groove 13 that opens at the lower end of the front plug 10 is formed.

The rear plug 20 is made of a tubular member, and is formed to have a rear lock hole 22 which is orthogonal to the axis thereof and which is opened rearward.

The front arm joint 30 extends in a substantially vertical direction and has a front joint hole 31 into which the front plug 10 can be inserted, a lock pin hole 32 penetrating perpendicularly to the front joint hole 31, and a front joint hole 31. A hook pin hole 33 communicating with the lower part is bored, a lock pin 34 movable in the front-rear direction is arranged in the lock pin hole 32, and a hook pin 38 movable in the vertical direction is provided in the hook pin hole 33. It is arranged. The front arm joint 30 is fixed to the front end of the side pipe 2a by opening the front joint hole 31 upward.

The lock pin 34 has a large diameter portion 34a slightly smaller than the diameter of the front lock hole 12 of the front plug 10 and a small diameter portion 34b smaller than the width of the opening 13, and the small diameter portion 34.
A push button 35 is fixed to the tip of b.
The small diameter portion 34b of the lock pin 34 and the push button 35 are supported by a lock pin holder 36 and are urged to the left in FIG. 2 by a spring 37, and the lock pin holder 36 is inserted into the lock pin hole 32. The lock pin 34 is fixedly arranged so as to be movable in the lock pin hole 32.

The hook pin 38 is biased upward in the hook pin hole 33 by a spring 39, and the front plug 10
It is arranged so that it can be pushed downward by the lower end of the. Then, when the front plug 10 is pulled out from the front joint hole 31, the hook pin 38 ascends and comes into contact with the small diameter portion 34b, and the large and small diameter portions 34a, 34b of the lock pin 34 are also brought into contact.
The lock pin 34 is formed so as to be capable of engaging with the step portion of the lock pin 34 and preventing the movement of the lock pin 34 by the spring 37. Also, the front plug 10
When it is inserted into the front joint hole 31, it is pressed by the lower end of the front plug 10 to release the engagement between the stepped portion and the lock pin 34.

The rear arm joint 40 has a rear joint hole 41 extending substantially vertically and into which the rear plug 20 can be inserted, and a slide pin hole 42 orthogonal to the rear joint hole 41. 42 includes
A spring 45 urges the slide pin 44 to the left in FIG.

The rear joint hole 41 is formed in a long hole shape having a long diameter in the front-rear direction. Also, the slide pin 44 is
The rear plug 20 is formed with a diameter slightly smaller than the rear lock hole 22, and an operation lever 46 for moving the slide pin 44 is connected to the one end by a pin 47. Reference numeral 47 is a guide lever that guides the operation lever 46. The rear arm joint 40 is fixed to the rear pipe 2c by opening the rear joint hole 41 upward.

In the armrest attaching / detaching mechanism of the wheelchair constructed as above, the front plug 10 is inserted into the front joint hole 31 of the front arm joint 30 and the rear plug 20 is arranged at the rear arm joint 40 in the state where the armrest 5 is attached. Is inserted into the rear joint hole 41.

In this state, the opening groove 13 of the front plug 10
Straddles the small diameter portion 34b of the lock pin 34, and the front plug 10
The lower end overcomes the biasing force of the spring 39 and pushes down the hook pin 38. Therefore, the lock pin 3 by the hook pin 38
4 has been disengaged and the lock pin 34 has a spring 37.
The large-diameter portion 34a is biased to enter into the front lock hole 12. Therefore, the front arm joint 30 locks the vertical movement of the front plug 10, and the front pipe 5b of the armrest 5 is fixed to the side frame 2 (see FIG. 5).

On the other hand, in the rear plug 20, in the rear arm joint hole 41, the slide pin 44 enters into the rear lock hole 22 to lock the vertical movement of the rear plug 20, and the rear pipe 5c of the armrest 5 is locked. Are fixed to the side frame 2 (see FIGS. 7 and 8).

To remove the arm rest 5, first, the operating lever 46 of the rear arm joint 40 is operated to retract the slide pin 44, and the engagement between the rear lock hole 22 and the slide pin 44 is released. Also, the front arm joint 3
By pushing the push button 35 of 0 against the biasing force of the spring 37, the lock pin 34 is moved to the right in FIG. As a result, the large diameter portion 34a moves to the outside of the front lock hole 12, and the small diameter portion 34a comes into the front lock hole 12.

At this time, the front plug 10 has the hook pin 3
8 is pushed upward by the spring 39 via the opening groove 1
3 passes through the small diameter portion 34b and moves upward, and the front plug 1
0 is unlocked. At this time, the hook pin 38
Engages the small diameter portion 34b and engages with the large diameter portion 38a stepped portion to prevent the lock pin 34 from moving. Then, the armrest 5 is pulled out upward to complete the removal.

To mount the armrest 5, the front plug 10 and the rear plug 20 are respectively attached to the front arm joint 3
0, the rear arm joint 40 is inserted almost at the same time. At this time, the opening groove 13 of the front plug 10 is externally fitted to the small diameter portion 34b, and the front end of the front plug 10 contacts the hook pin 34 as the armrest 5 is pushed down. Furthermore,
When the front plug 10 is pushed down by overcoming the urging force of the spring 39, the hook pin 38 descends, and the engagement of the lock pin 34 with the stepped portion of the large diameter portion 34a is released. When the front plug 10 reaches the lowest position, the lock pin 34 moves to the left by the urging force of the spring 37, the large diameter portion 34a enters into the front lock hole 12, and the front arm joint 30 moves the front plug 10 to the front plug 10. Lock. On the other hand, the rear plug 20 has the rear joint hole 4
1, and the height positions of the rear lock hole 22 and the slide pin 44 match at the lowest position. Then, the operation lever 46 is operated to move the slide pin 44 forward, the slide pin 44 enters the rear lock hole 22, and the rear arm joint 40 locks the rear plug 20.

Further, when the armrest is attached or detached, the front plug 1
0, even if the axis of the rear plug 20 is inserted with a slight inclination with respect to the axes of the front joint hole 31 and the rear joint hole 41, due to the oval shape of the rear joint hole 41 in the front-rear direction,
Jerky insertion is prevented, and the front plug 10 is guided by the front joint hole 31 and smoothly inserted.

The present invention is not limited to the above description and illustrated examples, and its embodiment can be modified without departing from the technical idea of the present invention. For example, the armrest may be formed by integrally forming the main pipe, the front pipe, and the rear pipe. Also,
The rear arm joint may be attached to the upper side pipe. Further, the mounting positions of the front and rear arm joints and the front and rear plugs may be reversed front and back. Further, the rear plug may be directly formed on the pipe forming the armrest.

[0031]

The armrest attaching / detaching mechanism for a wheelchair according to the present invention is configured as described above, and the armrest can be securely fixed to the side frame to stand upright, and the armrest can be released by a simple operation. Can be removed.

Further, even if the insertion direction is inclined when the armrest is attached or detached, the armrest can be smoothly attached and detached without jerking. As a result, it is possible to easily get on and off the wheelchair.

[Brief description of drawings]

FIG. 1 is a left side view of a wheelchair equipped with an armrest attaching / detaching mechanism for a wheelchair according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the front arm joint.

FIG. 3 is a plan sectional view of the front arm joint.

FIG. 4 is a front sectional view of the front arm joint.

FIG. 5 is a side sectional view showing a locked state of the front arm joint.

FIG. 6 is a side sectional view of the rear arm joint.

FIG. 7 is a plan sectional view of the rear arm joint.

FIG. 8 is a side sectional view showing a locked state of the rear arm joint.

[Explanation of symbols]

 1 Wheelchair 2 Side Frame 5 Armrest 10 Front Plug 12 Front Lock Hole 13 Opening Groove 20 Rear Plug 22 Rear Lock Hole 30 Front Arm Joint 31 Front Joint Hole 34 Lock Pin 38 Lock Pin 40 Rear Arm Joint 41 Rear Joint Hole 44 Slide Pin

Claims (1)

[Claims] 1. An armrest attaching / detaching mechanism for a wheelchair having an armrest erected on a side frame, wherein the armrest has a front plug having a substantially vertical axis at one end and the front plug at the other end. A rear plug parallel to the axis of the front plug, the front plug having a front lock hole penetrating perpendicularly to the axis and a width smaller than a diameter of the front lock hole communicating with the front lock hole, An opening groove opened at a lower end of the front plug, the rear plug having a rear lock hole formed at right angles to an axis thereof, and the side frame includes the front frame. A front arm joint engageable with the plug and a rear arm joint engageable with the rear plug, wherein the front arm joint includes a front joint hole into which the front plug can be inserted; A large-diameter portion slightly smaller than the diameter of the hole and a small-diameter portion smaller than the width of the opening groove are provided so as to be movable orthogonal to the axis of the front joint hole, and urged in one direction. A lock pin, a hook pin movably provided in the axial direction of the front joint hole, urged upward, and abutted against the lock pin at an upper position to prevent the hook pin from moving.
The rear arm joint is provided with a rear joint hole into which the rear plug can be inserted and has a long diameter in the front-rear direction, and a rear joint hole that is movable orthogonal to the axis of the rear joint hole. An armrest attachment / detachment mechanism for a wheelchair, characterized in that the armrest attachment / detachment mechanism is formed with a slide pin that can be fitted into the rear lock hole.