JPH1052332A - Standing action assisting chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform sitting action and standing action by setting force applied in a seat part lifting direction to be roughly constant. SOLUTION: A first movable link arm 33 to connect a frame part 22 and a seat part 29, a second movable link arm 34 that is long positioned on the back side of the first movable link arm 33, and a gas spring 35 provided between the front side of the frame part 22 and the back side of the seat part 29 are provided between the frame part 22 and the seat part 29. As the back of a user is slightly moved up in a seated condition, the back side of the seat part 29 is lifted to be high about the front side of the seat part 29 as a rotation center by difference between rotation radiuses of the movable link arms 33, 34. The gas spring 35 rotates roughly in parallel to the seat part 29 at this time, so the angle of the gas spring 35 to the seat part 29 can be set to be roughly constant, thereby force to lift the seat part 29 can be set to be roughly constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stand-up assisting chair for assisting a stand-up operation, for example, when the user leaves a sitting position, and more particularly to a stand-up assisting chair suitable for use as a chair with legs, a seating chair, or the like.

[0002]

2. Description of the Related Art In general, a chair comprises a frame serving as a base, and a seat mounted on the frame.
The user sits down on the seat while sitting down.

Further, in recent chairs, in order to reduce the burden when an elderly or disabled person stands up from a posture sitting on the seat, the rear side of the seat is lifted high with this rising operation. There is a stand-up assist chair that assists stand-up operation.

[0004] Therefore, a standing assist chair of this kind according to the prior art will be described with reference to FIGS. 5 to 7.

[0005] In the drawing, reference numeral 1 denotes a stand-up assisting chair according to the prior art. The stand-up assisting chair 1 is roughly constituted by a frame portion 2, a seat portion 7 and a gas spring 9 described later.

Reference numeral 2 denotes a frame part which forms the base of the stand-up assisting chair 1. The frame part 2 includes four legs 3, 3, ... standing upright at the front, rear, left, and right. Beams 4, 4 before and after connecting the portion 3 to the left and right, and left and right beams 5, 5 located at the upper end of each leg 3 and connecting each leg 3 to the front and rear.
And a backrest 6 erected on each leg 3 at the rear side.
It is roughly composed of

[0007] Reference numeral 7 denotes a seat provided on the upper side of each leg 3 of the frame 2, and the seat 7 protrudes from a rectangular seat plate 7A and a peripheral edge of the seat plate 7A as shown in FIG. And a bracket 7C, 7C (shown only on the right side), which is located on the left and right sides, and integrally protrudes from the front side of the frame body 7B. ing. And the seat 7
The bracket 7C is connected between the front legs 3 and 3 by pins 8 so that the bracket 7C is rotatable about the pins 8 as a fulcrum.

Reference numeral 9 denotes a gas spring provided between the frame 2 and the seat 7. The gas spring 9 includes a tube 9A in which a pressurized gas or the like is sealed and a tube 9A.
A piston (not shown) slidably inserted in A,
A proximal end side is connected to the piston, and a distal end side is substantially constituted by a piston rod 9B protruding and retractable from the tube 9A. 9D is provided.

Here, the gas spring 9 is connected to the tube 9
The bracket 9C on the A side is connected to the seat portion 7 via the rods 10 bridged to the frame 7B in the left and right directions, and the bracket 9D on the piston rod 9B is bridged on the left and right beams 5. It is connected to the frame part 2 via a rod 11. The gas spring 9 constantly urges the piston rod 9B in the extending direction by the pressurized gas in the tube 9A. In a no-load state, as shown in FIG. ing.

The stand-up assisting chair 1 according to the prior art is
With this configuration, when the user sits on the seat 7, he / she rests his / her weight on the seat plate 7 </ b> A of the seat 7 whose rear side is lifted as shown in FIG. By pushing down the seat 7 against the urging force, the seat 7
Can sit on top.

On the other hand, when the user stands up, the rear side of the seat 7 is lifted by the urging force of the gas spring 9 by raising the hips gently.

[0012]

In the stand-up assisting chair according to the prior art described above, when the seat 7 is almost in the seating position, as shown in FIG. The angle is as small as α1, and the gas reaction force F1 of the gas spring 9 and the force f1 for lifting the seat 7 are as shown in the figure, and this f1 is a small value. Also, as shown in FIG. 7, when the seat 7 is in the raised position, the angle of the gas spring 9 with respect to the seat 7 is as large as α2, and the gas reaction force F1 'of the gas spring 9 is large. The force f2 for lifting the seat 7 is as shown in the figure, and this f2 is a large value.

As a result, of the urging forces of the gas spring 9, the force acting in the direction of lifting the rear side of the seat 7 becomes f1 at the seating position of the seat 7, and f2 at the rising position.
As a result, the sitting operation and the rising operation cannot be performed smoothly.

That is, when standing up from a seated state, there is a problem that the force f1 for lifting the seat portion 7 is small and the load at the time of rising cannot be reduced. On the other hand, when the user sits, the force f2 for lifting the seat 7 is large acting on the seat 7, so that there is a problem that a person with a light weight cannot easily sit.

The present invention has been made in view of the above-mentioned problems of the prior art, and the seating operation and the rising operation can be performed smoothly by making the force acting in the direction of lifting the seat substantially constant. It is intended to provide a stand-up assisting chair.

[0016]

According to a first aspect of the present invention, there is provided a stand-up assisting chair according to the first aspect of the present invention, comprising: a base frame; and a seat provided above the frame. A connection mechanism for connecting the frame portion and the seat portion so that the rear side of the seat portion can be lifted, and one side connected to the front side of the frame portion, and the other side connected to the rear side of the seat portion. And a gas spring.

With this configuration, when the load on the seat at the seating position is removed, the gas spring expands, and the biasing force acts on the seat to raise the rear of the seat to a high level. . At this time, the gas spring is connected to the rear side of the seat portion and the front side of the frame portion, and rotates substantially in parallel with the seat portion along with the rotation of the seat portion. The angle of the gas spring with respect to the seat between the rising position and the seat is substantially constant. Thus, the force acting in the direction of lifting the seat by the gas spring can be made substantially constant.

According to a second aspect of the present invention, the connecting mechanism includes a first movable link arm having one side rotatably connected to the frame portion and the other side rotatably connected to the seat portion. One side is rotatably connected to the frame portion behind the connecting portion of the first movable link arm, and the other side is located behind the first movable link arm to the seat portion. And a second movable link arm rotatably connected.

With this configuration, when the biasing force of the gas spring is applied to the seat, the first movable link arm and the second movable link arm rotate, and the front side of the seat is slightly lifted. The rear side of the seat is lifted high. Thus, the seat can be lifted by a motion close to the motion of a person standing up.

According to a third aspect of the present invention, the first movable link arm and the second movable link arm form a second movable link arm that is longer than the first movable link arm. It is in the configuration.

According to this structure, when the gas spring is extended, the second movable link arm on the rear side is longer than the first movable link arm on the front side. Due to the difference, the seat portion can be lifted high so as to pivot on the rear side with the front side as a fulcrum, and the seat portion can be lifted by an action close to the movement when a person stands up.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a stand-up assisting chair according to an embodiment of the present invention.

In the figure, reference numeral 21 denotes a stand-up assist chair according to the present embodiment. The stand-up assist chair 21 is generally constituted by a frame 22, a seat 29, and a stand-up assisting mechanism 31, which will be described later.

Reference numeral 22 denotes a frame portion which forms the base of the auxiliary chair 21. The frame portion 22 includes front, rear, left,
..., four legs 23, 23,... Erected to the right, beams 24, 25 before and after connecting each leg 23 to the left and right, and located at the upper end of each leg 23. Left and right beams 26, 26 connecting the legs 23 to the front and rear, as shown in FIG.
It comprises a backrest 27 supported by a support 26A extending upward from the rear end of the right beam 26.

A rod support bracket 28 is attached to the front beam 24 and forms a part of the frame portion 22. The rod support bracket 28 has a U-shaped cross-section so as to be fitted to the beam 24. It comprises a mating portion 28A and a rod support plate 28B extending rearward from the fitting portion 28A.
E-shaped rod engaging hole 2 that adjusts the force for lifting the seat portion 29 depending on the position where the piston rod 35B is engaged.
8C is formed.

In the rod support bracket 28, the fitting portion 28A is fitted to the upper end of the beam 24, and the rod support plate 2
8B is inclined downward at an angle of approximately 45 degrees toward the rear. Thereby, in a state where the seat portion 29 is in the sitting position,
An angle β1 described later between the seat portion 29 and the gas spring 35 is an angle necessary for lifting the seat portion 29 by the gas spring 35.

Reference numeral 29 denotes a seat portion provided on each leg 23 of the frame portion 22. The seat portion 29 is formed as a thick rectangular plate, and a mounting bracket 30 described later is provided on the lower surface side.
Is installed.

Reference numeral 30 denotes a mounting bracket fixed to the lower surface of the seat 29 and forming a part of the seat 29. The mounting bracket 30 includes a flat base plate 30A and a base plate 30A.
A, a tube support plate 30B provided on the center rear side, arm connection plates 30C, 30C provided on both left and right ends of the base plate 30A (only the right side is shown), and a tube support plate 30B and a right side. The arm connecting plate 30 provided between the arm connecting plate 30C and the base plate 30A.
D. The arm connecting plate 30
C and 30D are inclined forward and extend, and the arm connecting plate 3
0D is located on the front side of the base plate 30A, and the arm connecting plate 30C is provided behind the arm connecting plate 30D.

Reference numeral 31 denotes a rising assist mechanism provided between the frame portion 22 and the seat portion 29. The rising assist mechanism 31 includes a fixed link arm 32, a first movable link arm 33, and a second Movable link arm 34,
It is composed of a gas spring 35.

Numeral 32 denotes a fixed link arm attached to the rear beam 25. The fixed link arm 32 has a fitting portion 32A formed in a U-shaped cross section so as to fit to the beam 25,
A right arm plate 32B extending forward from a right end of the fitting portion 32A substantially in parallel with the seat portion 29 at the seating position, and a left arm plate 32C extending forward from a left end of the fitting portion 32A. (Shown by dotted lines in FIG. 1), and the right side arm plate 32B is bent in a crank shape inward at the tip end side. In addition, this fixed link arm 3
No. 2 need not be provided, but a beam may be provided on the side, and this beam may function similarly to the fixed link arm.

Reference numeral 33 denotes a first movable link arm provided between the fixed link arm 32 and the mounting bracket 30 of the seat 29. The first movable link arm 33 has one end on the right side of the fixed link arm 32. The other end is rotatably attached to the tip of the arm connecting plate 30D of the mounting bracket 30.

Numerals 34, 34 are located on the rear side of the first movable link arm 33, and are provided between the fixed link arm 32 and the mounting bracket 30 of the seat 29. Each of the second movable link arms 34 has a fixed end on one side of the arm plate 3 of the fixed link arm 32.
The other end is rotatably attached to the tip of the arm connecting plate 30C of the mounting bracket 30.

Here, the movable link arms 33, 34
The second movable link arm 34 located on the rear side
The movable link arm 33 is longer than the movable link arm 33. As a result, the rear side of the seat 29 is
Is lifted by the difference between the turning radii of the first movable link arm 33 and the second movable link arm 34,
The seat 29 is lifted high so that the rear side of the seat 29 pivots around the front side of the seat 29. The first movable link arm 33, the second movable link arm, and the like constitute a connection mechanism for connecting the frame portion 22 and the seat portion 29.

A gas spring 35 is provided between the rod support bracket 28 of the frame portion 22 and the mounting bracket 30 of the seat portion 29. The gas spring 35 is a tube 35A in which pressurized gas or the like is sealed. And a piston (not shown) slidably inserted into the tube 35A, and a piston rod 35B having a proximal end connected to the piston and a distal end extending and contracting from the tube 35A. A bracket 35C is provided on the bottom side of the tube 35A, and a bracket 35D is provided on the distal end of the piston rod 35B.

Here, the gas spring 35 is configured such that the bracket 35C on the tube 35A side is connected to the tube support plate 30B of the mounting bracket 30, and the piston rod 35B
The side bracket 35D is connected to the rod support plate 28B of the rod support bracket 28. Then, the gas spring 35 constantly urges the piston rod 35B in the extending direction by the pressurized gas in the tube 35A, and in a no-load state, as shown in FIG. ing.

The rising assist chair 21 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

First, the case of sitting on the seat 29 will be described. In this case, as shown in FIG. 3, the rear side of the seat 29 is lifted by the rising assist mechanism 31 (starting position). Therefore, the user places his / her waist on the seat 29 to apply weight. Thereby, the rear side of the seat portion 29 gradually descends against the urging force of the gas spring 35,
As shown in FIG. 2, the seat 29 is in a state of being supported on each leg 23 (seating position), so that the user can sit on the seat 29 in this state.

On the other hand, when standing up from a state of sitting on the seat portion 29, the rear side of the seat portion 29 is lifted by the urging force of the gas spring 35 by slightly raising the waist. At this time, since the first movable link arm 33 and the second movable link arm 34 respectively rotate,
Due to the difference between the turning radii of the movable link arms 33 and 34,
With the front side of the seat portion 29 slightly lifted, the rear side of the seat portion 29 is lifted high about the front side as the center of rotation. Thereby, the seat portion 29 comes to the rising position shown in FIG. 3 with a motion close to the motion when a person stands up, so that the user can easily get up from the seat portion 29.

Here, the bottom side of the tube 35A of the gas spring 35 is connected to the rear side of the seat 29,
Since the distal end side of the piston rod 35B is connected to the front side of the frame portion 22, the gas spring 35 pivots about the front side of the frame portion 22 as in the case of the seat portion 29 and is substantially parallel to the seat portion 29. .

Accordingly, the angle of the gas spring 35 with respect to the seat 29 is β1 at the seating position of the seat 29 shown in FIG. 2 and β2 slightly larger than β1 at the rising position of the seat 29 shown in FIG. Become. However, at the seating position of the seat portion 29, the gas spring 35 is in the most contracted state,
Tube 35A by the amount of penetration of piston rod 35B
The pressure of the pressurized gas inside increases. On the other hand, at the rising position of the seat portion 29, the gas spring 35 is in the most extended state, so that the tube 35 corresponds to the retreat of the piston rod 35B.
The pressure of the pressurized gas in A decreases. As a result, the seat 29
The biasing force of the gas spring 35 is large at the seating position where the angle of the gas spring 35 with respect to the angle .beta.1 is small.
9 from the seating position to the rising position.

Thus, according to the present embodiment, the force for rotating the seat 29 so as to lift the rear side is applied to the seat 2.
9 can be made substantially constant from the sitting position to the rising position. Therefore, when sitting on the seat portion 29, even a person with a light weight can easily sit, and when standing up from the sitting state, a large force is required. The seat portion 29 can be lifted, and the load at the time of rising can be reduced.

As a result, the seating operation on the seat portion 29 and the rising operation can be performed easily and smoothly without taking measures such as increasing the urging force of the gas spring 35. The performance can be improved, and the reliability of the rising assist chair 21 can be improved.

In the above-described embodiment, the chair having four legs 23 has been described as an example of the auxiliary lift chair 21, but the present invention is not limited to this. Each leg 2 like the auxiliary chair 41
3 'is formed in a short length, and a bottom plate 4 is provided at the lower end of each leg 23'.
It may be configured as a seat and chair type provided with 2.

Further, in the above-described embodiment, a connecting mechanism which forms a link mechanism including the first and second movable link arms 33, 34 and the like is provided, whereby the front side of the seat 29 is slightly raised. By raising the rear side while raising, it is made to be close to the movement of a person standing up, but the present invention is not limited to this, and as shown in FIGS. The gas spring tube may be connected to the rear side of the seat portion, and the piston rod may be connected to the front side of the frame portion, while being rotatably connected to the frame portion.

Further, in the above-described embodiment, the arm plate 32B of the fixed link arm 32 is formed so as to extend forward substantially in parallel with the seat portion 29 at the seating position, and the second movable link arm 33 is more movable than the first movable link arm 33. Although the case where the link arm 34 is formed to be long is illustrated, instead, for example, the arm plate of the fixed link arm may be formed so as to extend forward with a downward or upward inclination. The length of the first movable link arm and the length of the second movable link arm may be appropriately adjusted.

[0046]

As described above in detail, according to the first aspect of the present invention, when the load on the seat at the seating position is removed, the gas spring expands, and this urging force acts on the seat. Raise the rear of the seat high. At this time, since the gas spring is connected to the rear side of the seat and the front side of the frame, the gas spring can be rotated substantially parallel to the seat along with the rotation of the seat. Thus, the angle of the gas spring with respect to the seat between the seating position and the rising position of the seat can be made substantially constant, and the force acting in the direction of rotating the seat can be made substantially constant. As a result, when sitting on the seat, even a person with a light weight can push down the seat and easily sit down, and when standing up from the sitting state, the seat can be lifted with a large force, Burden can be reduced. Thereby, the sitting operation and the rising operation on the seat portion can be easily and smoothly performed, and the reliability of the rising assist chair can be improved.

According to the second aspect of the present invention, when the urging force of the gas spring is applied to the seat, the first movable link arm and the second movable link arm rotate to slightly lift the front side of the seat. In addition, the rear side of the seat can be lifted high. Thus, the movement of the seat is close to the movement when a person stands up, so that the user can be reliably started up from the seat.

According to the third aspect of the present invention, when the gas spring is extended, the second movable link arm on the rear side is longer than the first movable link arm on the front side. The front side of the seat can be slightly lifted due to the difference in the dynamic radius, and the seat can be lifted high such that the rear side of the seat is pivoted about the front side. Thus, the movement of the seat can be approximated to the movement when a person stands up, and the user can be more reliably started up from the seat.

[Brief description of the drawings]

FIG. 1 is a plan view showing a standing assistance chair according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the rising assist chair in a state where a seat portion is arranged at a sitting position, as viewed from the direction of arrows II-II in FIG. 1;

FIG. 3 is a vertical cross-sectional view showing the rising assist chair in a state where a seat portion is arranged at a rising position, as viewed from the same position as in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a rising assist chair according to a modified example of the present invention.

FIG. 5 is a plan view showing a standing assist chair according to the related art.

FIG. 6 is a vertical sectional view showing the rising assist chair in a state where the seat portion is arranged near the seating position, as viewed from the direction indicated by arrows VI-VI in FIG. 5;

FIG. 7 is a vertical sectional view showing the rising assist chair in a state where the seat portion is arranged at the rising position, as viewed from the same position as in FIG. 6;

[Explanation of symbols]

 21, 41 Rise assist chair 22 Frame part 29 Seat part 33 First movable link arm (connection mechanism) 34 Second movable link arm (connection mechanism) 35 Gas spring

Claims (3)

[Claims] 1. A frame portion serving as a base, a seat portion provided on an upper side of the frame portion, a connecting mechanism for connecting the frame portion and the seat portion so that a rear side of the seat portion can be lifted, A rising assist chair comprising a gas spring connected on one side to the front side of the frame portion and the other side connected to the rear side of the seat portion. A first movable link arm having one side rotatably connected to the frame portion and another side rotatably connected to the seat portion; and one side including the frame. Portion is rotatably connected to the rear of the connecting portion of the first movable link arm, and the other side is positioned rearward of the first movable link arm and rotatably connected to the seat. 2. The rising assist chair according to claim 1, comprising a second movable link arm formed. 3. The first movable link arm and the second movable link arm have a configuration in which a second movable link arm is formed longer than the first movable link arm. 2. The stand-up assisting chair according to 2.