JPH0722729U - Lift up chair - Google Patents

Abstract

(57) [Summary] [Purpose] In a lift-up chair that has a moving seating surface and supports standing up movement or sitting movement, it supports the standing up movement to a posture close to the standing posture and significantly reduces the burden on the user. . [Structure] An operating body 8 for instructing a movement of a seat surface, a guide means 4 for guiding the seat surface 8 from a position where a seated posture is maintained to an obliquely upward tilt position and a return movement, and an operating body 8 Drive means 7 for moving the seat surface 3 according to the guide means 4 in response to an instruction is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lift-up chair, and more particularly, to a lift-up chair that assists a standing motion or a sitting motion for rheumatism, an elderly person with weak legs and waist, a person whose knees are difficult to bend due to illness or injury.

[0002]

[Prior art]

 Conventionally, this type of lift-up chair has a structure in which (1) the seat surface is tilted by the biasing force of the spring to support the rising, and (2) the seat surface is tilted while being electrically driven to support the rising motion. (3) A structure that electrically raises the seat surface to assist the standing motion is known.

More specifically, in the configuration of (1) above, a spring is provided on the back side of the seat surface, and when seated, a force (weight) larger than the urging force of the spring is applied to the seat surface, so that the seat is normally horizontal. When it is pushed down to the surface position and stands up from the chair, the force exerted on the seat surface is reduced by slightly lifting the waist, and the biasing force of the spring acts to assist the standing up. In the configuration of (2) above, the seat surface is provided with a lift function, and the rear seat surface and the backrest, which are raised in a horizontal state, are tilted forward to assist standing up. There is. Further, in the configuration of (3) above, the seat surface rises from the state of the seat chair that is close to the floor surface to assist the rising.

[0004]

[Problems to be solved by the device]

 However, in the configuration of (1) described above, a great load is applied to the knees and ankles when standing up. It cannot be applied to people with muscle weakness because it requires thigh muscle strength to stand up. It is not easy to adjust the spring, and if the bias is too strong, an elderly person with weak muscles may fall. An unstable standing posture. This will force large movements on the lower limb joints and cannot be applied to persons with limited range of motion. There is a drawback that the user must move the center of gravity sufficiently forward. Further, with the configuration of (2) above, although it can be applied to a person with weak thigh muscle strength, it cannot provide support until the person completely stands up. Since it does not support the ischium, it has the drawback of slipping forward.

Further, in the above configuration (3), the user himself / herself has to move forward on the seat surface, and when he / she descends from the seat surface, the knees and ankles suddenly add weight. There is. As described above, none of the conventional lift-up chairs is configured so that the movement of the seating surface follows the natural standing-up movement, so that the standing-up assistance is insufficient and the user is often burdened. Was to give.

In consideration of the above problems of the conventional lift-up chair, the present invention can support the standing up motion to a position close to the standing position, thereby significantly reducing the burden on the user. The purpose is to provide a lift-up chair.

[0007]

[Means for Solving the Problems]

 The present invention is a lift-up chair that has a moving seat surface and supports a standing motion or a seating motion, and an operating body for instructing the movement of the seat surface, and a position where the seating posture is maintained, and an oblique upward tilt position. The lift-up chair includes guide means for guiding the seat surface until the seat moves and returns, and drive means for moving the seat surface according to the guide means in response to a moving instruction from the operating body. In the present invention, it is preferable that the seat surface is divided into a plurality of parts, and the front seat surface is bent downward as it rises.

[0008]

[Action]

 According to the present invention, when the operation body is operated to instruct the movement of the seat surface, the seat surface is guided by the guide means, and while moving from the seated position to the diagonally upper inclined position. As a result, when standing up or sitting down, it is possible to sufficiently support the standing up motion or the sitting down motion, and it becomes possible to easily stand up and sit down without imposing a burden on the user.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the configuration of a lift-up chair according to an embodiment of the present invention, showing a state when it is not in operation. In the figure, the lift-up chair includes a leg 2 provided with a caster 1, a seat surface 3, a guide arm 4 as a guide means for connecting the leg 2 and the seat surface 3, and a seat surface 3 side. Armrest 5 erected from the seat portion, backrest 6 erected from the back of the seat surface 3, and the seat surface 3 via the guide arm 4 Actuator integrated motor as drive means (hereinafter simply referred to as actuator) ) 7 and a toggle switch 8 as an operating body for turning on / off the drive of the actuator 7. Hereinafter, the configuration of each unit will be described in detail.

The leg 2 is composed of horizontal members 2 a arranged in parallel, a connecting member 2 b connecting them, and a vertical member 2 c standing upright from the horizontal member. The vertical members 2 c have two front sides and two rear sides. It is formed higher than a book.

The seat surface 3 is divided into two parts with a wavy boundary line 3a as a boundary, and the front seat surface 3b is moved downward by approximately 90 ° with respect to the boundary line 3a during the rising operation (arrow A direction in FIG. 2). It is configured to bend. Further, the shaded portion of the seat surface 3 is formed to be slightly raised, and the raised portion 3c functions as a slip stopper by locking the ischial tuberosity when the seat surface is inclined.

The guide arm 4 is composed of a plurality of arms having different lengths and a plurality of joints that rotatably connect the arms, and as shown in FIG. 2d, the front arm 4a, the rear L-shaped rear arm 4b connected to the fulcrum 2e of the rear vertical member 2c, the connecting member 4c connecting the arms 4a and 4b, and the rear arm 4b. And an auxiliary arm 4f that connects the upper end 4e and the rear seat surface 3d. An arm having the same structure is provided on the back side, and the front side portions of the rear seat surface 3d are connected to the support portion 4k of the connecting member 4c.

Each front side portion of the front seat surface 3b is connected to one end of the arm 4h, and the other end is connected to the support portion 4i of the arm 4b. The fulcrum mentioned above is fixed. On the other hand, the supporting part is not fixed, and all the arms and members connected to it are rotatable. Reference numeral 3e in the drawing denotes a hinge that connects the front seat surface 3b and the rear seat surface 3d so as to be bendable.

The toggle switch 8 is for instructing “motion off”, “seat up”, and “seat down”, and can be operated only with a fingertip. The main body of the actuator 7 is swingably supported by the rear connecting member 2b, and its operating shaft 7a is connected to the fulcrum 4j at the tip of the L-shaped portion of each inverted L-shaped rear arm 4b, 4b. Has been done. The operating shaft 7a is pulled in when "to raise the seat surface" is instructed from the toggle switch 8 and is sent out when instructing to "down the seat surface". The operation of this embodiment having the above configuration will be described with reference to FIG. In the figure, 2d, 2e, and 2f are fulcrums.

FIG. 3A shows a seated posture in which the toggle switch 8 is not operated. In the seated posture, the operating shaft 7a is completely pulled out, and therefore, the arm 4b rotating about the fulcrum 2e, the arm 4a rotating about the fulcrum 2d, and the connection connected to those arms 4b, 4a. The member 4c and the auxiliary arm 4f are in a folded state. (B) of the figure shows the state during movement of the seat surface. While the actuator 7 pulls in the operating shaft 7a, the arm 4b rotates in the direction of arrow D with the fulcrum 2e as the rotation axis, the arm 4a also rotates in the direction of arrow D with the fulcrum 2d as the rotation axis, and the upper end of the arm 4b further rotates. The portion 4e rotates in the direction of the arrow E, erects the folded auxiliary arm 4f, and tilts the rear seat surface 3d. As the rear side seat surface 3d is inclined, the front side seat surface 3b is divided from the rear side seat surface 3d and is inclined in the arrow F direction. (C) of the figure shows a state in which the movement of the seat surface is completed. When the actuator 7 completely retracts the operating shaft 7a, the arm 4b stands up in a substantially vertical state, and the arm 4a also stands up in a substantially vertical state. The arm 4e and the auxiliary arm 4f move so as to approach a substantially straight line, and after the movement is completed, the arm 4e and the auxiliary arm 4f are bent in the opposite direction with an inclination of 16 °, and the rear seat surface 3d stops at a predetermined inclination position. That is, the rear seat surface 3d has moved to the diagonally upper inclined position. Further, the front seat surface 3b stops in a substantially vertical state. The seat surface inclination angle and the seat surface rising height in the above-described operation are determined based on the analysis of the rising operation, and the analysis content will be described below.

First, FIGS. 4 and 5 show an analysis of a motion of a healthy person standing up from a normal chair. The seat surface is horizontal, and the heights of the front end of the seat surface from the floor surface are 41 cm and 45 cm, respectively. When trying to stand up from a standstill, first move the center of gravity forward and lean your trunk forward. Along with that, the pelvis also leans forward (at this time, the pelvis leans forward to the maximum). Also, at that moment, the knee moves slightly forward. See the range in (2) and FIG. 5 of FIG. Next, the center of gravity is moved further forward in order to lift the buttocks, and the buttocks are lifted. See (3) in FIG. Next, when the buttocks float, the trunk is gradually extended (the height of the greater trochanter is around 62 to 64 cm). At this time, the forward tilt of the pelvis moves with the same maximum forward tilt as the initial forward tilt. See the range in (4) and FIG. 5 of FIG. Next, loosen the forward tilt of the pelvis to the standing position. See range in FIG. In the above operation, the forward movement distance from the stationary state to the standing position is about 30 cm.

Next, the rise was analyzed when the seat surface of the chair was tilted at 16 ° and the front end of the seat surface was set at 43 cm from the floor surface. When standing up from this position, the pelvis should be tilted forward by tilting the seat and the weight should be transferred forward (the height of the greater trochanter is about 55 cm). If you try to stand up from that point on, you will only need to make a slight forward lean because the pelvis is leaning forward. See range in FIG. To make that angle forward, lean the trunk a little. From there, keep the anteversion angle and extend the trunk upward (the height of the greater trochanter is about 61 to 63 cm). See range in FIG. From there, loosen the pelvic forward tilt. In this way, if the seat surface is tilted by 16 °, the pelvic tilt angle can be made smaller than that when the seat surface is horizontal.

Further, the rise when the seat surface of the chair is inclined by 20 ° and the front end of the seat surface is set at 47 cm from the floor surface was analyzed. The rising from this position assists the initial pelvic inclination (range in FIG. 6) at the time of rising from the above-described inclination of the seat surface of 16 °, so that the inclination angle of the seat surface is set to 20 ° and the pelvic inclination is extracted ( The height of the greater trochanter is about 62 to 64 cm). Bring it up to the standing position with the pelvis angle. From there, loosen the angle of the pelvis to the standing position. FIG. 7 shows the trajectories of the greater trochanter and pelvis described above, and it can be seen that the pelvic anteversion at the initial stage of rising is covered.

[0019] The main problems in standing up of a person with weak muscles are that it is difficult to move the center of gravity until the buttocks are floated forward to maximize the pelvic tilt. Therefore, if the seating surface is moved up to that position, it is possible to support the standing up to the standing position without changing the angle of the pelvis.

Secondly, it is difficult to lift the buttocks and bring the trunk to the extension position without the strength of the trunk and the strength of the lower limbs. In order to solve the above two problems, the rising operation according to the present embodiment configured to support the natural rising operation will be described with reference to FIG. First, in order to solve the first problem, in this embodiment, the seat surface is inclined by 16 ° to promote the pelvic forward inclination. See (1) and (2) in FIG. The 16 ° tilt of the seat surface and the rising from the front height 43 cm of the seat surface make it easier to stand up because it promotes forward tilt of the pelvis, but it is necessary to further tilt forward even from that point. Therefore, the seat surface is further tilted up to 20 °, and the front height of the seat surface is increased to 47 cm to further promote the pelvic tilt. When standing up from that position, the pelvis can stand up with the anteversion angle of the pelvis at that time.

In order to solve the second problem, as in the locus of rising of a healthy person shown in FIG. 4, the seat surface when the seat surface is moved to follow the posture at which the trunk is about to extend The posture of the above was in agreement with the above-mentioned rising position from the seat surface inclination of 20 ° and the seat surface front side height of 47 cm. That is, the posture shown in (3) of FIG. 4 and the posture shown in (3) of FIG. 8 match.

In addition, the locus of the standing motion after the seat surface is tilted at 20 ° and the height of the front side of the seat is 47 cm and the locus of the standing motion from the posture in which the trunk tries to extend during the standing motion of a healthy person are the same. did.

From the above description, if the seat surface is moved in the order of (2) → (3) → (4) in FIG. 8, the rising operation can be supported most naturally. In order to maintain the sitting position most easily, the seat surface is set at an angle of 5 ° rearward, and the seat surface also changes from 20 ° to 16 ° as the pelvic forward tilt angle becomes loose at the final standing position. I like to put it back.

Although the operating body of the present invention is the toggle switch in the above-mentioned embodiment, the operating body is not limited to this and may be composed of any switch as long as it can instruct the movement of the seat surface.

Further, although the guide means of the present invention is composed of a plurality of arms in the above-mentioned embodiment, the guide means is not limited to this, and as long as it can move the seat surface diagonally upward, it can be moved up / down like a pantograph system, for example. It can also be composed of a lowering device. Further, the drive means of the present invention is constituted by the actuator-integrated motor in the above embodiments, but the drive means is not limited to this, and may utilize hydraulic pressure or pneumatic pressure.

[0026]

[Effect of device]

 As is clear from the above description, according to the present invention, it is possible to support the standing up to a posture close to standing up, and also it is possible to support from a posture close to standing up to a fully seated posture. As a result, the burden on the user when standing up or sitting down can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a lift-up chair according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where a seat surface of the lift-up chair of FIG. 1 is raised.

FIG. 3 is an explanatory diagram explaining an operation of the embodiment.

FIG. 4 is an analysis diagram of a normal rising operation according to the embodiment.

5 is an explanatory diagram showing a trail of rising with respect to FIG. 4. FIG.

FIG. 6 is an explanatory diagram showing a trail of rising according to the embodiment.

FIG. 7 is an explanatory diagram showing a trail of rising according to the embodiment.

FIG. 8 is an analysis diagram of a rising operation according to the embodiment.

[Explanation of symbols]

 2 Legs 3 Seat surface 3b Front seat surface 3d Rear seat surface 4 Guide arm 6 Backrest 7 Actuator 8 Toggle switch

Claims (3)

[Scope of utility model registration request] 1. A lift-up chair having a moving seat surface for assisting a standing motion or a seating motion, and an operation body for instructing the movement of the seat surface, and a diagonally upward tilt position from a position for maintaining a sitting posture. A lift-up chair comprising guide means for guiding the seat surface until it moves and returns and drive means for moving the seat surface according to the guide means in response to a movement instruction from the operating body. . 2. The seat surface is composed of at least two divided seat surfaces of a front seat surface and a rear seat surface via a widthwise bending line, and as the seat surface moves to the diagonally upward tilted position. The lift-up chair according to claim 1, wherein the front seat surface is configured to be bent downward. 3. The lift-up chair according to claim 1, wherein the guide means has an arm member that interlocks from a substantially horizontal position to a substantially vertical position with two fulcrums provided on the lift-up chair body as an axis.