JPH08317951A - Chair - Google Patents

Abstract

PURPOSE: To provide a chair that has a simple structure, that enables a handicapped person to rise easily and that also facilitates safe use. CONSTITUTION: A parallel link 8 is formed consisting of a lower base frame 1, upper horizontal member 5, front vertical member 6 and rear vertical member 7, such that the first two items are parallel to each other and so are the last two. In this parallel link 8, the frame 2a of the back 2 is formed so as to be tiltable back and forth. The seat 3 is provided with a seat-attaching part 19 at the rear end extendedly to the rear, and then the seat 3 is attached to the frame 2a of the back 2 in such a manner that the front of the seat 3 is inclined downward at its elevated position concurrently with the forward tilting state of the frame 2a. Between the seat 3 and the frame 2a of the back 2, forward and backward rolling rollers 20, 21 are interposed which are pivotally attached to the state-attaching part 19 and which are rollingly movable up and down on the front and rear vertical members 6, 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair for assisting standing up.

[0002]

2. Description of the Related Art Conventionally, as a chair capable of assisting a person to stand up, a back portion and a seat portion are attached to a support member which is erected at the rear of the chair so as to be able to move up and down, and the seat portion is raised as the back portion and the seat portion rise. A structure has been known in which the rear end portion of the seat portion is lifted by a belt mechanism so that the portion tilts forward.

[0003]

However, the above-mentioned conventional chair has a complicated belt mechanism and is difficult to manufacture.
Further, there is a drawback that the tiltable angle of the back is small. Further, since the back does not have a vertical shape or an inclining shape, when an elderly person, a sick person, or the like stands up, it may be difficult to raise the upper body and it may not be possible to stand up smoothly.

Therefore, the present invention solves the above-mentioned problems and has a simple structure and is comfortable to sit on, and
The purpose is to provide a chair that allows a person to easily stand up.

[0005]

In order to achieve the above-mentioned object, a chair according to the present invention has a lower base and an upper horizontal member which are parallel to each other, and a front vertical member and a rear vertical member which are parallel to each other. A parallel link is formed, and the skeleton of the back part is formed by the parallel link so as to be able to tilt forward and backward, and a seat part attachment part is provided in a rearward extension shape at the rear end part of the seat part. The seat is attached to the skeleton through the seat attachment portion and the front and rear rolling rollers pivotally attached to the seat vertical portion and capable of rolling up and down on the front vertical member and the rear vertical member, respectively. The part is attached so that the part is tilted downward at the raised position.

In the state where the skeleton of the back part is vertically erected, the rear rolling roller corresponding to the rear vertical member of the parallel link of the skeleton is moved to the front rolling member corresponding to the front vertical member of the parallel link. It is also preferable to arrange it above the roller.

Further, a reclining drive mechanism for tilting the back skeleton back and forth, a lifting drive mechanism for lifting and lowering the seat, and a tilt angle θ of the back when the height H of the seat is larger than a predetermined value. Is between -5 ° and 15 °, and when the height H of the seat is less than or equal to the above predetermined value, the tilt regulating means for regulating the back inclination angle θ between 15 ° and 45 °. It is also desirable to have it.

[0008]

[Action]

(According to claim 1) Since the back skeleton can be tilted back and forth by the parallel link, the tiltable angle of the back can be set large. Therefore, the adjustment range of the inclination angle of the back portion is widened. Since the back part leans forward, the back part supports the person's back when standing up and can easily raise the upper body. Further, when the back (skeleton) is tilted forward, the seat tilts forward and downward at the raised position, which naturally results in a mid-waist state and is easy to stand up.

(According to claim 2) The front and rear rollers are pressed against the front vertical member and the rear vertical member of the back skeleton inward in the front-rear direction by the load applied to the seat, and the posture of the seat is changed. Is maintained. The higher the height position of the rear rolling roller is than the height position of the front rolling roller, the smaller the force with which the front and rear rollers press against the front vertical member and the rear vertical member. Therefore, in this chair, the pressure contact force between the front and rear rollers and the reaction force thereof are smaller than in the case where the front and rear rollers are substantially at the same height position, and the front and rear rollers are applied to the seat portion. Can withstand loads.

When the height of the seat is less than a predetermined value (according to claim 3), the seat is seated on the seat, and the inclination angle of the back is 15
It can be adjusted between ° and 45 °. Also, the inclination angle of the back is 15
Since it does not become smaller than °, there is no risk of the upper body rising too much or falling forward. Also, if the seat is raised and the height dimension is made larger than a predetermined value, the inclination angle of the back portion is −5 ° to 15 °.
It is regulated between 0 °, so when standing up, the person's back is pushed forward and the upper body naturally rises. Moreover, since the waist position becomes higher and the seat portion inclines downward toward the front, it becomes extremely easy to stand up.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments.

FIG. 1 and FIG. 2 show an embodiment of a chair according to the present invention, which comprises a base 1, a back portion 2 attached to the base 1 so as to be tiltable in the front-back direction, and a back portion 2 thereof. The seat part 3 is attached so as to be able to move up and down, and the armrests 4 and 4 that are lifted up and down integrally with the seat part 3. Although only the entire frame is shown for the sake of easy understanding, a cushion material, upholstery material, etc. are actually attached to predetermined portions.

The base 1 includes a pair of left and right side supporting members 9, 9.
And a connecting member 10 for connecting the side supporting members 9, 9 to each other.
And a pivotal support member 11, 11 having an L-shape in a front view, which is fixed to the upper surface of the connecting member 10.

The parallel link 8 is attached to the front of the base 1 and the vertical piece of the pivot member 11 of the base 1 before the lower end thereof is pivotally mounted so as to be swingable around a horizontal axis in the left-right direction. The vertical member 6, a rear vertical member 7 having a lower end pivotally attached to the rear portion of the vertical piece of the pivot member 11 so as to be swingable about a horizontal axis in the left-right direction, the front vertical member 6, and the rear vertical member 7. And an upper horizontal member 5 having a front end and a rear end pivotally connected to each other at the upper end thereof.

That is, the lower base 1 and the upper horizontal member 5 which are parallel to each other and the front vertical member 6 and the rear vertical member 7 which are parallel to each other form a parallel link 8. An auxiliary intermediate connecting member 12 is provided at an intermediate height position between the front vertical member 6 and the rear vertical member 7.

Thus, the skeleton 2a of the back portion 2 is formed by the parallel links 8 and 8 so that it can be tilted forward and backward. Specifically, the skeleton 2a of the back portion 2 is the base 1 of the pair of left and right parallel links 8,8.
And a horizontal connecting member 13 for connecting the upper ends of the parallel links 8 to each other.

Further, at the rear end portion of the seat portion 3, seat portion mounting portions 19, 19 are provided.
Is provided in a backward stretched state. The seat attachment portions 19, 19 are made of a metal plate, and are vertically arranged behind the left and right ends of the seat 3.

Further, as shown in FIGS. 1 and 3, the seat mounting portions 19, 19 are connected to the front and rear rolling rollers 20 ,.
Front vertical members 6,6 and rear vertical members 7,7 of the parallel links 8,8
It is mounted so that it can move up and down. In addition, the seat portion 3 is configured to be tilted forward and downward when the skeleton 2a is tilted forward (see FIG. 9).

That is, the seat portion 3 is attached to the skeleton 2a of the back portion 2,
The seat mounting portion 19 and the front and rear rolling rollers 20 and 21 which are pivotally attached to the front vertical member 6 and the rear vertical member 7 are capable of rolling up and down respectively.
The seat portion 3 is attached so that the skeleton 2a is tilted forward at the raised position when the skeleton 2a is tilted forward.

Further, as shown in FIG. 3, the front vertical member 6 and the rear vertical member 7 of the parallel link 8 are composed of vertical rail portions 6a on the outer side,
7a and inner pillars 6b and 7b.

The front rolling roller 20 is fitted in the rail groove of the vertical rail portion 6a of the front vertical member 6 so as to be vertically rollable, and in the rail groove of the vertical rail portion 7a of the rear vertical member 7,
The rear rolling roller 21 is fitted so as to be vertically rollable.

Further, in a state in which the skeleton 2a of the back portion 2 is vertically erected, the rear rolling roller 21 corresponding to the rear vertical member 7 of the parallel link 8 of the skeleton 2a is attached to the front vertical member of the parallel link 8. It is arranged above the front rolling roller 20 corresponding to No. 6 (see FIG. 8).

As a result, the durability of the front / rear rolling rollers 20, 21 and the parallel link 8 (that is, the front vertical member 6 and the rear vertical member 7) is improved.

This will be described with reference to the simplified diagrams shown in (a) and (b) of FIG. The moment M about the intermediate point P of the front and rear rolling rollers 20, 21 due to the load W applied to the seat portion 3 is M = W
XL '. Further, the couple N acting on the parallel link 8 by the front and rear rolling rollers 20 and 21 is N = F × H ', and this couple N is equal to the moment M, so W × L' =
The formula of F × H ′ holds. Therefore, the force F is inversely proportional to the height dimension H between the front and rear rolling rollers 20, 21.

However, as is clear by comparing (a) and (b) in FIG. 5, the height dimension H'in (b) is larger than the height dimension H'in (a). Because it is small, (b)
The force F in (a) is larger than the force F in (a). Especially, when the front and rear rolling rollers 20 and 21 have the same height (that is, when the value of the height dimension H is 0),
An extremely large force (in theory, an infinitely large force) is applied to the rear rolling rollers 20 and 21, and the parallel link 8 and the front and rear rolling rollers 20 and 21 are deformed or damaged.

Conversely, by arranging the rear rolling roller 21 above the front rolling roller 20, the front-rear link 8
The force that acts on the
Therefore, it is possible to prevent the front and rear rolling rollers 20, 21 from being deformed or damaged.

By arranging the rear rolling roller 21 above the front rolling roller 20 as described above, a slight angle from the vertical state of FIG. 8 to the forward inclined state of FIG. That is, at the angle θ = −5 °, the absolute value of the angle θ ′ at which the seat portion 3 tilts forward and downward becomes large. Therefore, the seated person can easily stand up.

Referring back to FIGS. 1 and 2, the armrest 4 includes an armrest mounting member 22 mounted at its rear end and front and rear rolling rollers 20, 21 pivotally mounted on the mounting member 22. , And is attached to the front vertical member 6 and the rear vertical member 7 of the parallel link 8 so as to be able to move up and down. That is, the front and rear rolling rollers 20, 21
Is rotatably fitted into the vertical rail portions 6a and 7a.

Furthermore, on the front surfaces of the left and right front vertical members 6, 6,
A front elevation holding member 23a, which is of a portal type in a plan view, is arranged to hold the four front rolling rollers 20 at predetermined intervals with each other (see FIGS. 1, 2, and 3). That is, the pivotal shafts of the front rolling rollers 20 rotatably pass through the upper and lower end portions of the left and right half portions of the front lifting / lowering holding member 23a.

Similarly, on the rear surfaces of the left and right rear vertical members 7, 7,
A front elevation holding member 23b having a gantry shape in plan view, which holds the four rear rolling rollers 21 at predetermined intervals, is provided (see FIGS. 1 and 3). That is, the pivotal support shafts of the rear rolling rollers 21 rotatably pass through the upper and lower end portions of the left and right half portions of the rear lift holding member 23b.

As a result, the left and right ends of the seat portion 3 and the armrest 4 can be held at the same height, respectively, and the seat portion 3 and the armrest 4 can be moved up and down integrally with a substantially constant vertical interval. Is possible.

As shown in FIGS. 2, 3 and 4, this chair is provided with a reclining drive mechanism A for tilting the skeleton 2a of the back part 2 back and forth, and a lifting drive mechanism B for driving the seat part 3 up and down. And are equipped with.

The reclining drive mechanism A is shown in FIGS.
As shown in FIG. 5, the parallel links 8 and 8 are connected to each other near the upper end portions of the front vertical members 6 and 6 and to the substantially intermediate height portion, respectively, and a mounting and holding member 14a having a bracket 15a in the middle portion, and a rear vertical member. 7, 7 and 7, the attachment holding member 14b having a bracket 15b in the middle portion, and the bracket 15 of the upper attachment holding member 14a.
An oscillating female screw member 16 including an arm portion 16a having an upper end portion pivotally attached to a and being pivotable about a horizontal axis in the left-right direction, and an internal thread main body portion 16b fixed to the lower end of the arm portion 16a.
A male screw rod 17 which is screwed into the swinging female screw member 16 so as to be able to advance and retreat, and an output shaft is interlockingly connected to the lower end of the male screw rod 17 and the motor body is attached and held at a substantially intermediate height position 14b.
The tilting drive motor 18 pivotally attached to the bracket 15b so as to be swingable around the horizontal axis in the left-right direction.

As a result, the motor 18 is rotationally driven in the rearward tilted state of the back portion 2 shown by the solid line in FIG.
When the screw is retracted, the back portion 2 swings forward. Then, as shown by an imaginary line, the back portion 2 can be inclined forward. At this time, the mounting and holding members 14a of the upper and middle heights,
The interval dimension L between the 14b is larger than that in the backward inclined state.

Further, the motor 18 is rotated to drive the male screw rod.
When 17 is screwed, the back part 2 swings backward.

As shown in FIGS. 2 and 3, the elevating drive mechanism B includes an elevating drive motor 26 fixedly provided inside the left and right parallel links 8, 8 and an inner side of the parallel links 8, 8. A vertical screw rod 27 that is rotatably mounted around the vertical axis parallel to the front and rear vertical members 6 and 7, and an output shaft of the motor 26 and a lower end portion of the vertical screw rod 27 that are interlocked and coupled. Mechanism 28
A female screw member 29 that is fixed to the inner surface of the front lifting and lowering holding member 23a and that is screwed into the vertical screw rod 27 so as to be able to advance and retract.
have.

At the lower part of the skeleton 2a, a mounting support member 25 is fixedly arranged to connect the vicinity of the lower ends of the front vertical members 6, 6 of the parallel links 8, 8 to each other. A lower end portion of the vertical screw rod 27 is pivotally connected to the attachment support member 25, and an upper end portion of the vertical screw rod 27 is pivotally connected to the attachment holding member 14a via a pivot support 24.

With the above structure, when the motor 26 is driven to rotate, the vertical screw rod 27 rotates and the female screw member 29 moves up or down. Along with this, the front lifting / lowering holding member 23a, the front rolling rollers 20 ..., the rear lifting / lowering holding member 23b, and the rear rolling rollers
21 ..., seat mounting portion 19, seat portion 3, and armrest mounting member 22
And the armrest 4 ascend or descend. Therefore, the seat portion 3 and the armrest 4 can be raised and lowered with a substantially constant vertical interval.

In the illustrated example, the speed reduction mechanism 28 is composed of a belt and a pulley, but it is also preferable to configure the speed reduction mechanism 28 with a plurality of gears.

Further, in this chair, when the height dimension H of the seat portion 3 is larger than a predetermined value, the inclination angle θ of the back portion 2 is -5 °.
The tilting restriction means C is provided for restricting the inclination angle θ of the back portion 2 between 15 ° and 45 ° when the height dimension H of the seat 3 is less than or equal to a predetermined value. .

Here, the height dimension H of the seat portion 3 means the back portion 2
Is defined as the vertical distance from the lower surface of the base 1 to the tip of the seat surface 3a of the seat 3 when the inclination angle θ is 15 ° (see FIGS. 6 and 7).

Therefore, (returning to FIG. 2 and FIG. 3), the tilt restricting means C includes a height detecting limit switch 30 arranged at a predetermined height position of the front vertical member 6 of the skeleton 2a of the back portion 2. ,
Three tilt angle detecting limit switches 31 arranged vertically along the male screw rod 17 of the reclining drive mechanism A.
a, 31b, 31c and their limit switches 30, 31a, 31
It is provided with a control circuit (not shown) that controls the rotation of the motor 18 of the reclining drive mechanism A and the motor 26 of the lifting drive mechanism B by signals from b and 31c.

Further, the predetermined value of the height dimension H of the seat portion 3 of the tilt regulating means C is set to 300 mm.

The height detecting limit switch 30 includes a seat 3
When the height dimension H of the is less than 300mm (when it is less than the specified value)
In addition, when the front lifting / lowering holding member 23a is contacted and detected, and when the height H of the seat 3 is larger than 300 mm (larger than a predetermined value), the front lifting / lowering holding member 23a is separated from the front lifting / lowering holding member 23a. It is fixed at the position where it will not be detected.

The tilt angle detection limit switch 31a at the upper end has the tilt angle θ of the back portion 2 (in the forward tilted state).
When it reaches −5 °, it contacts with the main body portion 16b of the swinging female screw member 16 of the reclining drive mechanism A and is fixed at a position in the detection state.

Limit switch 31 for detecting an intermediate tilt angle
b is always in contact with the main body portion 16b of the oscillating female screw member 16 when the inclination angle θ of the back portion 2 is 15 ° or less (which is the rearward inclination state) and is in the detection state, and the inclination angle θ is greater than 15 °. When becomes smaller, the oscillating female screw member 16 is fixed at a position where it is separated from the main body portion 16b and is in the non-detection state.

Limit switch 31 for detecting the tilt angle at the lower end
When the inclination angle θ of the back portion 2 reaches 45 °, c contacts the main body portion 16b of the oscillating female screw member 16 and is fixed at a position in the detection state.

However, as shown in FIGS. 6 and 1, when the height H of the seat portion 3 is 300 mm or less (when it is a predetermined value or less), the height detecting limit switch 30 is in the detection state. The control circuit receiving the signal regulates the rotation drive of the tilting drive motor 18 so that the tilt angle θ of the back portion 2 is within the range of 15 ° (FIG. 6) to 45 ° (FIG. 1). It

As a result, when a person is seated on the seat portion 3, the inclination angle θ of the back portion 2 does not become smaller than 15 °, so that the person can be prevented from slipping forward from the seat portion 3 and the sitting comfort can be improved. Is good.

The inclination angle θ of the back portion 2 can be freely adjusted within the range of 15 ° to 45 °, and there is an advantage that the adjustable range of the inclination angle θ is large.

Further, as shown in FIGS. 7, 8 and 9, when the height dimension H of the seat portion 3 is made larger than 300 mm (that is, larger than a predetermined value), the height detecting limit switch 30 becomes When the control circuit receives the signal in the non-detection state, the inclination angle θ of the back part 2 is (from FIG. 9) −5 ° to (FIG. 7).
The rotation drive of the tilt drive motor 18 is restricted so as to be within the range of 15 °.

As a result, when a person tries to stand up, the inclination angle θ of the back part 2 does not become larger than 15 °-
That is, since the back portion 2 does not fall backward too much, the strength of the back portion 2 can be secured. In addition, it is safe because it can prevent people from falling backwards.

Further, since the back portion 2 supports the back of the person, the upper body can be easily raised, and the seat portion 3 tilts forward and downward at the raised position, so that the person naturally becomes a middle waist state.
Therefore, even a weak person or a physically handicapped person such as an old person or a sick person can easily stand up.

The present invention can be modified in design other than the above-mentioned embodiments. For example, the limit switches 30 and 31 can be changed.
The mounting positions of a, 31b, and 31c may be freely set at positions other than the positions shown in FIGS. 2 and 3, and the number of limit switches may be changed. It is also free to use sensors other than limit switches.

Further, the predetermined value of the height H of the seat portion 3 can be freely changed to other than 300 mm, and is preferably set within the range of 200 mm to 400 mm, and set within the range of 250 mm to 350 mm. Is particularly preferable. The specified value is 200 mm
If it is smaller than that, the seat portion 3 becomes too low and the comfort of sitting becomes poor.
Further, if the predetermined value is larger than 400 mm, there is a drawback that the feet of a short person may float.

[0056]

Since the present invention is configured as described above,
The following effects are obtained.

According to the chair of the first aspect, the adjustment range of the inclination angle θ of the back portion 2 in the sitting state is widened, and an old man or the like can sit comfortably for a long time. Further, since the back portion 2 can be tilted forward when the seat portion 3 is raised and stands up, the back portion 2 can support the back of a person and raise the upper body easily. Moreover, since the seat portion 3 tilts forward and downward at the raised position,
The person is naturally in a middle back position, and even a physically handicapped person such as a sick person or an elderly person can easily stand up by himself. Furthermore, the structure is simple and can be easily manufactured.

According to the chair of claim 2, the same effect as that of claim 1 is obtained, and the front and rear rollers 2 are provided.
The front vertical member 6 and the rear vertical member 7 of the parallel links 8 and 0, 21 can be prevented from being deformed or damaged, and the durability is excellent. Further, the seat portion 3 can be largely tilted forward and downward only by tilting the back portion 2 forward from the vertical state by a slight angle, and the rising is further facilitated.

According to the chair of claim 3, the same effect as that of claim 1 or 2 is obtained, and the inclination angle θ of the back part 2 is 15 when the person is seated on the seat part 3. °
It can be adjusted in a wide range of ~ 45 °, which makes it comfortable to sit on. Further, since the inclination angle θ of the back portion 2 does not become smaller than 15 °, there is no risk of the upper body rising too much or the whole body sliding forward. Furthermore, when the seat portion 3 is raised and stands up, the inclination angle θ of the back portion 2 does not become larger than 15 °, that is, the back portion 2 does not fall backward too much. It can be prevented and is safe, and the strength of the back portion 2 can be secured.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a sectional front view.

FIG. 3 is a sectional plan view.

FIG. 4 is an explanatory view of the operation of the reclining drive mechanism.

FIG. 5 is a simplified explanatory diagram of a main part.

FIG. 6 is a side view illustrating a seat portion descending state.

FIG. 7 is a side view illustrating a raised state of a seat portion.

FIG. 8 is a side view illustrating a raised state of a seat portion.

FIG. 9 is a side view illustrating a ready state for rising.

[Explanation of symbols]

 1 Base 2 Back 2a Skeleton 5 Upper horizontal member 6 Front vertical member 7 Rear vertical member 8 Parallel link 13 Horizontal connection member 19 Seat attachment part 20 Front rolling roller 21 Rear rolling roller A Reclining drive mechanism B Lifting drive mechanism C Tilt control means H Height dimension

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Dr. Tamayama 3-9 Nishiyumi, Yao-shi Komura Co., Ltd.

Claims (3)

[Claims] 1. Parallel links 8, 8 are formed by a lower base 1 and an upper horizontal member 5 which are parallel to each other, and a front vertical member 6 and a rear vertical member 7 which are parallel to each other, and the parallel links 8 are formed. ，
At 8, the skeleton 2a of the back portion 2 is formed so as to be tiltable in the front-back direction, and the seat portion attachment portions 19, 19 are provided at the rear end portion of the seat portion 3 in a rearward extension shape. The above seat mounting part 1
In the forward tilted state of the skeleton 2a through 9, 19 and front and rear rolling rollers 20, 21 which are pivotally attached to the front vertical member 6 and the rear vertical member 7 and which can roll up and down respectively. A chair characterized in that the seat portion 3 is attached so that the seat portion 3 is tilted forward in the raised position. 2. When the skeleton 2a of the back portion 2 is vertically erected, the rear rolling roller 21 corresponding to the rear vertical member 7 of the parallel link 8 of the skeleton 2a is attached to the front longitudinal direction of the parallel link 8. The chair according to claim 1, wherein the chair is arranged above the front rolling roller 20 corresponding to the member 6. 3. A reclining drive mechanism A for tilting the skeleton 2a of the back part 2 back and forth, a lift drive mechanism B for lifting and lowering the seat part 3, and a height dimension H of the seat part 3 larger than a predetermined value. Regulates the inclination angle θ of the back portion 2 between −5 ° and 15 °, and when the height dimension H of the seat portion 3 is less than or equal to the above predetermined value, the inclination angle θ of the back portion 2 is between 15 ° and 45 °. 3. The chair according to claim 1 or 2, further comprising: tilting regulation means C that is regulated by.