JPH0698166B2 - Posture change chair - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a posture-changing chair, and more particularly to a chair that can be reasonably transformed from a standing posture to a sitting posture or from a sitting posture to a standing posture.

(Prior Art) Conventionally, a chair in which the angle of the backrest portion can be adjusted with respect to the seat portion and the angle of the footrest can be adjusted has been provided, but the seat portion is horizontal with respect to the base. The angular position is
Normally, the posture is constant, and there is not yet provided a posture changing chair that performs the same movements as those in the case of sitting from the standing state or standing up from the sitting state.

(Problems to be Solved by the Invention) As described above, a conventional chair has an adjustable backrest angle, or a footrest provided with a footrest is adjustable. Already proposed,
All of these are designed in consideration of sitting comfort, and an elderly person with weakened lower limbs or a disabled person with paralysis changes their posture from a standing posture to a sitting posture or from a sitting posture to a standing posture. The burden of time cannot be reduced.

Therefore, when the above-mentioned elderly person or handicapped person sits on a chair or stands up, a great burden is imposed and, depending on the case, an attendant is required.

It is an object of the present invention to provide a chair which enables the above-mentioned elderly or disabled person to stand up and sit down comfortably without assistance.

(Means for Solving Problems) In order to solve the above-mentioned conventional problems, the present invention provides
As shown in FIGS. 1 and 2, a base (1) and a seat portion (2) that tiltably supports the base (1) in an upright position and a sitting position.
And a footrest portion (3) pivotally attached to the front portion of the seat portion (2) and a backrest portion (4) pivotally attached to the rear portion of the seat portion (2), the base (1) Between the seat and the seat (2), the seat (2)
A seat portion tilting actuator (14) for controlling the seating position to a standing position and a seating position is provided, and the backrest portion (4) is interlocked with the operation of the seat portion (2) by the actuator (14), When the seat (2) is moved to the upright position, the backrest (4) is laid down with respect to the seat (2), and when the seat (2) is moved to the seated position, the backrest is moved. While providing an interlocking mechanism for raising (4) with respect to the seat (2), the foot rest (3) is provided between the seat (2) side and the foot rest (3).
A foot rest drive actuator (34) for independently swinging the seat (2) with respect to tilting of the seat (2) is provided.

(Operation) When the posture is changed, the seat portion (2) is tilted by the seat portion tilting actuator (14) from a state of standing upright with respect to the base (1) to a horizontal state, and at the same time, the backrest portion ( 4) by the interlocking mechanism, in conjunction with the tilting of the seat portion (2), the seat portion (2) shifts from a state of reclining to a standing state to perform a sequence operation, and by this sequence operation, the sequence operation is performed. The seat portion (2) and the backrest portion (4) can be moved appropriately for changing the posture of an elderly person or a disabled person.

Further, when the seat portion (2) is tilted by the seat portion tilting actuator (14) at the time of changing the posture from the sitting position to the standing position, the footrest portion (3) is moved to the footrest part driving actuator. (34) by swinging independently of the tilting of the seat (2) so that the upper surface of the footrest (3) and the upper surface of the seat (2) form a single plane. , The foot of an elderly person or a handicapped person can be received by the foot rest (23) of the foot rest (3), so that even if the seat (2) tilts in the vertical direction, the seat (2) It is possible to prevent slipping from the seat, and conversely, even when the posture is changed from the standing position to the sitting position, the seat (2) becomes nearly horizontal and the center of gravity of the seated elderly or handicapped person becomes the seat (2). By making the foot rest (3) flush with the seat (2) until it is moved, an elderly person or a handicapped person can sit in the seating process. It is possible to prevent the footrest portion (3) from slipping off, and thus, the footrest portion (3) is oscillated independently of the tilting of the seat portion (2) by the footrest portion driving actuator (34). You can do that.

Furthermore, by swinging the footrest drive actuator (34) up and down in the seated posture, it is possible to bend and extend the foot of an elderly person or a disabled person.

(Example) The basic structure of the chair of the present invention is, as shown in FIGS. 1 and 2, a base (1) and a seat that tiltably supports the base (1) in an upright position and a sitting position. Since it is composed of a portion (2), a footrest portion (3) pivotally attached to the front portion of the seat portion (2), and a backrest portion (4) pivotally attached to the rear portion of the seat portion (2). is there.

The base (1) is composed of a pair of frames (10) in which columns (11) are erected and a plurality of horizontal rails (not shown) that connect the frames (10) to each other. ) Is provided with rolling wheels (12) before and after it to enable traveling, and a pump (5) for driving an actuator to be described later on the cross rail, and although not shown in FIGS. 1 and 2, A storage casing (13) for storing functional components such as an electromagnetic switching valve and an electric control component described later is provided.

The seat (2) is composed of a seat frame (20) consisting of a pair of side plates (21) and a cross rail (not shown) connecting the side plates (21), and a cushion (22). Therefore, the front part of each side plate (21) of the frame (20) is placed on the upper part of the column (11) of the base (1).
The base (1) is tiltably supported by the pivot shaft (23) from the standing position shown in FIG. 1 to the seating position shown in FIG.

And a portion of the seat frame (20) at a central portion in the width direction, which is located rearward of a pivotal attachment position to the column (11), and a central portion of the base (1) in the width direction of the frame. A seat portion tilting actuator (14) for controlling the seat portion (2) between an upright position and a seated position is provided between them.

The foot rest (3) has a pair of L-shaped side plates (31) and a foot rest (3) fixed between the side plates (31).
2), and each of the side plates (31) is provided at its upper end with a supporting portion (33) bent in the length direction of the side plate (31). At the front of each side plate (21) of the seat frame (20),
It is swingably supported via a pivot shaft (24) at a position in front of the pivot position of the pillar (11).

Then, at a position slightly deviated from the center in the width direction of the foot rest (3), the center in the vertical direction and the rear part of the seat (2), that is, the rear part of the seat frame (20). An actuator (3) for driving a footrest portion for swinging the footrest portion (3) with respect to the seat portion (2) between the horizontal rail provided on the
4) and the actuator (3
By the drive control of 4), the foot rest (3) is seated (2).
Can be independently rocked.

In the foot rest (3), the side plate (31) is provided with the support (33), and the foot rest (3) is connected to the seat (2) through the support (33). It is pivotally attached to the footrest (32) in the footrest (3) when the seat (2) is in the upright position and the footrest (3) is vertically positioned.
Becomes close to the floor surface, and when the seat portion (2) is in the sitting position and the foot rest portion (3) is vertically positioned as shown by the chain line in FIG. 2, the foot rest ( This is to prevent the feet of the person sitting on the seat (2) from floating above the floor (32) above the floor (32).

The backrest portion (4) includes a backrest frame (40) including a pair of side plates (41) and a cross rail (not shown) connecting the side plates (41), and a cushion (42). The lower portion of the side plate (41) is pivotally attached to the rear portion of the side plate (21) of the seat frame (20) via a pivot shaft (25), and the backrest portion (4). ) Is supported so as to be interlocked with the tilting of the seat portion (2) by the seat portion tilting actuator (14).

Then, of the side plates (41), the lower part of one side plate (41) is extended, and at the same time, the pillar (1) in the base (1) is
A bracket (15) is fixed to the upper part of (1), and a connecting link having a turnbuckle (43) in the middle between the bracket (15) and the extension (41a) of the side plate (41). The seat (2) of the backrest (4) supports the (44) via the pins (45) and (46) and is interlocked with the tilting of the seat (2).
The angle with respect to changes.

In FIGS. 4 and 5, (6) is a knee rest, which is fixed to the side of the seat (2), and a grip (61) is provided on the upper part thereof.

Further, in the chair configured as described above, the seat portion (2),
Actuators (14) (3) that operate the foot rest (3)
Although 4) may use a motor, a hydraulic cylinder is mainly used, and the hydraulic circuit shown in FIG. 6 is provided between the hydraulic cylinder and the pump (5) which is housed in the housing casing (13) of the base (1). Make up.

In FIG. 6, (51) is a 3-position 4-port solenoid switching valve interposed in the hydraulic circuit of the seat portion tilting actuator (14), and (52) is the footrest driving actuator ( 34) is a 3-position 4-port electromagnetic switching valve interposed in the hydraulic circuit of FIG. 34), wherein the switching ports (A) and (B) of the switching valves (51) and (52) are connected to the actuators (14).
Hydraulic pipes communicating with the rod side chamber and the head side chamber of (34) are connected, and pilot type check valves (53) (54) and flow control valves (55) to (58) are interposed in these hydraulic pipes. The discharge port of the pump (5) having a relief valve (59) is provided in the pump port (9) of the switching valves (51) (52), and the tank port (T) is provided in the tank port (T). The drain pipe that communicates with the tank (60) is connected.

Although the meter-in control is shown in FIG. 6, the flow direction of the check valves (55a) to (58a) connected in parallel with the flow control valves (55) to (58) is reversed and the meter is controlled. It may be out control.

Further, the control of each of the solenoid valves (51) (52) is performed by, for example, the seventh
The electric circuit shown in the figure is configured to perform a sequence operation.

The electric circuit shown in Fig. 7 is a relay (XR ₁ ) that forms a self-holding circuit by being excited by the ON operation of the operation switch (SW ₁ ) via the AC / AD converter (61) in the power supply circuit. (1) A relay (XR) that is excited by the ON operation of the operation circuit, the sitting operation switch (SW ₂ ) and the standing operation switch (SW ₃ ) to perform self-holding and interlock operation.
₂ ) Second and third operation circuits of (XR ₃ ), and foot rest operating switches (SW ₄ ) (S) for independently operating the swing of the foot rest (3)
The relay (XR ₄ ) (XR ₅ ) No. 4, which is excited by the ON operation of W ₅ ),
And a fifth operation circuit, also the each actuator (14) (34) is of providing a limit switch (LS ₁ ~LS ₄₎ for detecting the operating position.

That is, a standing limit switch (LS ₁ ) for detecting that the rod extends in the seat tilt actuator (14) and the seat (2) is in the standing position, and the rod contracts to move the seat (2). Is provided with a seating limit switch (LS ₂ ) for detecting that the foot resting portion is located at the seating position, and the footrest driving actuator (34) extends the rod so that the footrest (3) is seated (2). ) Foot extension limit switch (LS ₃ ) to detect that the rod is contracted and the foot refraction to detect that the foot rest (3) is refracted with respect to the seat (2). The limit switch (LS ₄ ) is provided.

Then, the normally open contact of the relay (XR ₁ ) in the first operation circuit is provided in the operation line of each operation circuit, and the relay circuits of the relays (XR ₆ ) to (XR ₁₀ ) are arranged in parallel with each operation circuit. And solenoids (SOL _{1 to} SO) of the motor (M) of the pump (5) and the solenoid valves (51) (52).
L ₄ ) is connected to the power line via the normally open contact of the relay (XR ₁₀ ).

First, the relay circuit is formed by connecting the normally open contacts of the relays (XR ₂ ) to (XR ₅ ) and the relays (XR ₆ ) to (XR ₉ ) in series in the second to fifth operation circuits. Along with
The relay circuit of the relay (XR ₁₀ ) is formed by directly connecting to the operation line of the operation circuit.

Of the limit switches, the normally closed contact of the standing limit switch (LS ₁ ) is connected to the third operation circuit.
The normally open contacts of the foot refraction limit switch (LS ₄ ) are provided in series with the second operation circuit.

The control circuit for the solenoids (SOL _{1 to} SOL ₄ ) is constructed as follows.

First, the solenoid (SOL ₁₎ which operates when extending the said seat tilt actuator (14) is a relay to energize the on-operation of the operation standing operation switch (SW ₃₎ (XR ₃₎
The normally open contact of the relay (XR ₇ ) in the relay circuit through the normally open contact of the above, and the normally open contact of the foot extension limit switch (LS ₃ ) that is turned on at the extended position and the relay (X
R ₆₎ is of being connected to the normally closed contact in series with, also, a solenoid (SOL ₂₎ which operates when deflating said actuator (14) is excited by ON operation of the operation switch for the seating operation (SW ₂₎ Relay (XR ₂ ) normally open contact via the normally open contact of the relay (XR ₆ ) and the normally open contact and relay of the foot extension limit switch (LS ₃ ) that is turned on in the extended position. It is connected in series with the normally closed contact of XR ₇ ).

Next, the solenoid (SOL ₃ ) that operates when extending the footrest drive actuator (34) is a parallel circuit in which the normally open contacts of the relays (XR ₇ ) (XR ₈ ) are connected in parallel. , A normally extended contact of a relay (XR ₉ ) operated by a foot rest operation switch (SW ₅ ) that operates the foot rest (3) to the bending side, and a foot extension limit switch (LS ₃ ) that is turned off at an extension position.
The solenoid (SOL ₄ ) that operates when the actuator (34) contracts is connected to the normally open contacts of the relays (XR ₆ ) (XR ₉ ) in parallel. The parallel circuit connected to, the normally-closed contact of the relay (XR ₈ ) operated by the footrest operation switch (SW ₄ ) for operating the footrest (3) to the contraction side, and the seating that is turned on at the sitting position. The limit switch (LS ₂ ) and the normally open contact are connected in series.

Next, the operation of the chair configured as described above will be described.

In this case, the operation switch (SW ₁ ) is first turned on to drive the pump (5). First, the case where the operator is seated from the standing state will be described.

In this standing state, each actuator (14)
Since (34) is extended, the normally closed contact of the standing limit switch (LS ₁ ) is open, the normally closed contact of the seating limit switch (LS ₂ ) is closed, and the normally open contact is open. The normally closed contact of the foot extension limit switch (LS ₃ ) is open, the normally open contact is closed, and the normally closed contact of the foot refraction limit switch (LS ₄ ) is closed.

Then, in this state, the sitting operation switch (SW ₂ )
When the second operation circuit is operated by pressing, and the relay (XR ₂ ) is excited, the relay (XR ₆ ) is excited and the operation circuit of the solenoid (SOL ₂ ) of the solenoid valve (51) is closed. The solenoid (SOL ₂ ) is excited to contract the seat tilting actuator (14) to tilt the seat (2) from the standing position shown in FIG. 1 to the seated position shown in FIG.

Then, this tilting continues until the normally closed contact of the seating limit switch (LS ₂ ) is turned off, that is, until the seating position is reached, and ends when the seating position is reached.

At this time, the seat portion (2) is tilted while the footrest portion (3) is maintained in the extended state, but the backrest portion (4) is seated by the seat portion (4) via the link (44). It will tilt with respect to 2).

Then, when the seat portion (2) reaches the seating position and the normally closed contact of the seating limit switch (LS ₂ ) is opened and the normally open contact is closed, the operation circuit of the solenoid (SOL ₄ ) of the solenoid valve (52). Closes, the actuator for driving the footrest portion (34) is contracted, and the footrest portion (3) is refracted as shown by the chain line in FIG. 2. At the end of this refraction operation, the foot refraction limit switch ( The normally closed contact of LS ₄ ) opens and the relay (X
R ₂ ) is demagnetized, the self-holding circuit is eliminated, the interlock is released, and the seating posture conversion is completed.

Next, the case of standing up from the seated state will be described.

In this seated state, each actuator (14)
Since both (34) are contracted, the normally closed contact of the standing limit switch (LS ₁ ) is closed, the normally closed contact of the seating limit switch (LS ₂ ) is open, and the normally open contact is closed. In addition, the normally closed contact of the foot extension limit switch (LS ₃ ) is closed, the normally open contact is open, and the normally closed contact of the foot refraction limit switch (LS ₄ ) is open.

However, when the operation switch for standing up operation (SW ₃ ) is pressed in this state and the relay (XR ₃ ) is excited, the relay (XR ₇ )
Is excited, and the operation circuit of the solenoid (SOL ₃ ) of the solenoid valve (52) is first closed by the closing operation of the normally open contact thereof, the actuator (34) for driving the footrest portion is extended, and the footrest base is moved. (32) is extended.

This extension operation is continued until the foot extension limit switch (LS ₃ ) is operated. However, until the foot extension limit switch (LS ₃ ) is operated, the normally open contact is kept open. The operation circuit of the solenoid (SOL ₁ ) of the solenoid valve (51) remains open, and the seat (2) remains in the seated position. Then, when the foot extension limit switch (LS ₃ ) is operated and the normally open contact is closed, the operation circuit of the solenoid (SOL ₁ ) of the solenoid valve (51) is closed, and the seat portion tilt actuator (14). Is extended and the seat portion (2) is tilted from the sitting position to the standing position.

Then, at the end of the standing operation of the seat portion (2), the normally closed contact of the standing limit switch (LS ₁ ) opens, and the relay (X
R ₃ ) is demagnetized, the self-holding circuit disappears, the interlock is released, and the conversion of the standing posture is completed.

In addition, by operating the foot rest operating switches (SW ₄ ) (SW ₅ ) in the sitting posture, the extension / bending movement of the foot rest (3) can be performed independently of the sequence operation. Since it can be repeatedly performed, this motion allows the knee to bend and stretch, and can also perform rehabilitation.

What has been described above is such that when the footrest (3) is converted to the sitting posture, the seat (2) is tilted to the sitting position and then refracted, and when the footrest (3) is converted to the standing posture, the seat portion (2) is changed from the bent state. After the extension, the seat portion (2) is sequentially operated so as to be tilted to the upright position, but the footrest (32) is rocked at the same time as the seat portion (2) is tilted or with a time lag. You may do it.

When the footrest portion (3) and the backrest portion (4) are individually swung by using actuators, respectively, as described above, the seat portion (2) can be swung independently of the seat portion (2). It can be applied to rehabilitation such as knee flexion and extension and hip flexion and extension.

In the embodiment described above, the seat tilting actuator (14) is provided between the base (1) and the seat (2).
As shown in Figs. 8 and 9, seat (2) and caster (16) at the tip
The leg body (17) to which is attached is supported by the pivot shaft (18), and the intermediate portion of the leg body (17) is connected to the link (19) supported on the base (1) to form the leg body (17). The actuator (14) may be interposed between the stand (17) and the base (1).

In this embodiment, the leg body (17) has an upper end portion extended, and a connection link (47) is interposed between the extension portion and the backrest portion (4), and the seat portion (2). The angle with respect to the seat portion (2) can be changed according to the tilting movement of (1).

Further, the foot rest driving actuator (34) is interposed between the foot rest (32) and the seat portion (2) as in the previous embodiment.

In the embodiments shown in FIGS. 1 and 8 described above, hydraulic cylinders are used for the actuators (14) and (34).
For example, an induction motor or a stepping motor that is easy to control may be used.

(Advantages of the Invention) The present invention provides a seat portion tilting actuator (14) for controlling the seat portion (2) between a standing position and a sitting position, and at the same time, the backrest portion (4) is provided by the actuator (14). An interlocking mechanism for tilting and raising the backrest (4) with respect to the seat (2) is provided in conjunction with the operation of the seat (2), while the footrest drive actuator (34) is used. Since the foot rest (3) is independently swung with respect to the tilting of the seat (2), the seat (2) can be changed when the posture is changed.
By the seat tilting actuator (14), the base (1)
At the same time as tilting from a standing state to a horizontal state, the backrest part (4) is interlocked with the tilting of the seat part (2) by the interlocking mechanism, and the backrest part (4) is laid down on the seat part (2). A sequence operation is performed by shifting to an upright state, and by this sequence operation, the seat portion (2) and the backrest portion (4) make a movement suitable for changing the posture of an elderly person or a disabled person. In addition, since the foot rest (3) can be swung independently of the tilting of the seat (2) by the foot rest driving actuator (34), it is possible to move from the sitting position to the standing position. When the seat portion (2) is tilted by the seat portion tilting actuator (14) when the posture is changed, the foot rest portion (3) is moved by the foot rest driving actuator (34). 2) It swings independently of the tilting of the footrest (3) and the upper surface of the footrest (3) and the seat. By allowing the upper surface of (2) to be flush with the upper surface, the foot of an elderly person or a disabled person can be received by the footrest (32) of the footrest (3), and thus the seat portion. Even if (2) tilts vertically, the seat (2)
It is possible to prevent slipping from the seat, and conversely, even when the posture is changed from the standing position to the sitting position, the seat (2) becomes nearly horizontal, and the center of gravity of the seated elderly person or the disabled moves to the seat (2). By making the foot rest (3) flush with the seat (2), it is possible to prevent an elderly person or a disabled person from sliding off the seat (2) during the sitting process.

Therefore, an elderly person and a handicapped person can easily stand up and sit down without assistance.

Further, since the driving of the seat portion (2) and the backrest portion (4) is performed by the driving of one actuator (14), the control system and drive system of the posture changing chair can be simplified. You can do it.

Further, since the swinging of the footrest section (3) by the footrest section drive actuator (34) is independent of the tilting of the seat section (2), the posture conversion is performed separately from the sequence operation described above. When the chair is in a sitting posture, the foot rest (3)
It is also possible to swing up and down to perform flexion and extension of the foot of a disabled person.

[Brief description of drawings]

FIG. 1 shows one embodiment of the present invention, a side view of a standing state with a part omitted, FIG. 2 is a side view of the same sitting state, FIG. 3 is a front view, and FIG. 4 is a user. Fig. 5 is a side view of a standing posture for explaining the relationship with Fig. 5, Fig. 5 is a side view of the same sitting posture, Fig. 6 is a hydraulic circuit diagram, Fig. 7 is an electric circuit diagram, and Fig. 8 is another embodiment. 1 is a side view corresponding to FIG. 1, and FIG. 9 is a side view corresponding to FIG. (1) ...... Base (2) ...... Seat (3) ...... Foot (4) ...... Back (14) ...... Seat tilt actuator

Claims (1)

[Claims] 1. A base (1), a seat (2) which tiltably supports the base (1) in an upright position and a seated position, and a front portion of the seat (2). A foot rest (3) to be worn and a backrest (4) pivotally attached to the rear of the seat (2), and a seat between the base (1) and the seat (2). A seat tilting actuator (14) for controlling (2) between an upright position and a sitting position is provided, and the backrest (4) is interlocked with the operation of the seat (2) by the actuator (14). Then, when the seat portion (2) is moved to the standing position, the backrest portion (4) is laid down with respect to the seat portion (2), and when the seat portion (2) is moved to the sitting position, The seat (2) is provided with an interlocking mechanism for erecting the backrest (4) with respect to the seat (2).
Between the side and the foot rest (3), a foot rest driving actuator (34) for independently swinging the foot rest (3) with respect to the tilting of the seat (2) is provided. A posture-changing chair.