JP4521059B1 - Seating structure - Google Patents

Abstract

The present invention provides a seat structure that can reduce a burden on a user's knee and is easy to use.
According to the present invention, in a seating portion structure configured to be able to change the posture between a seating posture in which a seat body (4) is lying in a horizontal state and a standing posture in which the seat body (4) is erected in an inclined state of front and rear and rear height. In the posture, the front end portion of the seat body (4) is moved upward from the seating posture. Further, the seat is positioned at a position in front of the front end of the seat body (4) and at the same height as the seat surface of the seat body (4) or above the seat surface as a rotation center (virtual point 15). It was decided to configure the body (4) to move. Furthermore, the seat body (4) is configured to change its posture along a pair of left and right guide rails (17) formed in an arc shape with a predetermined radius from the rotation center (virtual point 15).
[Selection] Figure 1

Description

  The present invention relates to a seating structure such as a chair or a bed that can be changed between a sitting posture in which a seat body is laid down horizontally and an upright posture in which the seat body is tilted up and down.

  Conventionally, in order to facilitate care work for caregivers when a wheelchair user gets on and off, the seating structure of the wheelchair is a sitting posture with the seat lying down horizontally and the front, rear, and rear heights. A configuration is known in which the posture can be changed to an upright posture that is raised in a slanted shape.

  In this conventional seat structure, the lower part of the front end of the seat is pivotably attached to the front end of the base, and a lift link is interposed between the base and the seat to drive the lift link. By doing so, the seat body is erected in a slanted shape with the front lower portion and the rear height with the front end lower portion of the seat body as the rotation center (see, for example, Patent Document 1).

JP 2007-29355 A

  However, in the above conventional seat structure, the seat is rotated around the lower front end of the seat, so that the user is strained with a burden on the knee and is easy to use. It wasn't.

  This is due to the fact that the joint of the user's knee sitting on the seating part, i.e., the center of rotation of the user's foot, is located in front of the seat, and the lower part of the front end of the seat is When the seat is rotated as the center of rotation, the height of the front end of the seat does not change and only the rear part of the seat moves upward, while the user's foot is indirect of the knee. Since the lower leg of the foot placed on the front end of the seat moves around the center of rotation, the movement of the seat matches the movement of the upper leg of the user's foot. This is because the distortion is applied to the user's knee as a burden.

Therefore, in the present invention according to claim 1, in the seating portion structure configured to be able to change the posture between a sitting posture in which the seat body is lying in a horizontal state and a standing posture in which the seat body is tilted up in a front, rear, and rear height, It is configured to move the front end of the seat in a posture above the seating posture, in a position in front of the front end of the seat and in a position above the seat surface of the seat, and in the posture and configured to move the seat support as the center of rotation the position to match the movement and moves upper leg portion of the knee joint of the user's foot and the center of rotation of the seat support when changing, the seat body posture A pair of left and right drive motors to be changed are attached to the inside of the left and right beams, and a pinion gear is attached to each drive motor, while a rack gear is attached to the left and right sides of the back surface of the seat, and each rack gear and the pinion gear are meshed. A predetermined half from the center of rotation It decided to constitute a seat element to be altered in attitude along the pair of guide rails formed on the arc-shaped.

  And in this invention, there exists an effect described below.

  That is, in the present invention, in the seating portion structure configured to be able to change the posture between a sitting posture in which the seat body is lying down horizontally and a standing posture in which the seat body is tilted up front and rear and rear, the seat body can be changed in the standing posture. Since the front end is configured to move upward from the sitting posture, the movement of the seat and the movement of the upper leg of the user's foot can be approximated when the posture is changed. Therefore, it is possible to reduce the burden on the knee, and it is possible to provide a seating structure that is easy to use.

  In particular, when the seat is configured to move at a position in front of the front end of the seat and at the same height as the seat surface of the seat or a position above the seat surface as the center of rotation. In addition, the movement of the seat and the movement of the upper leg of the user's foot can be substantially matched when the posture is changed, and the burden on the user's knee can be further reduced. It can be set as a simple seating part structure.

  In addition, when the seat body is configured to change its posture along a pair of left and right guide rails formed in an arc shape with a predetermined radius from the center of rotation, the labor and cost required for manufacturing can be simplified by simplifying the seat structure. It is possible to smoothly change the posture of the seat body along the guide rails.

The perspective view which shows the seating part structure which concerns on this invention. The front view. FIG. FIG.

  Hereinafter, a specific configuration of the seating structure according to the present invention will be described with reference to the drawings. In the following description, the case where the seating portion structure is applied to a chair is described. However, the seating portion structure according to the present invention may be a structure of a portion on which a user is seated, and is limited to a normal chair. It may be a wheelchair or a bed.

  As shown in FIG. 1 to FIG. 4, a chair 1 to which a seating structure according to the present invention is applied has a rectangular flat plate-like seat body 4 attached to a base 2 via a lifting mechanism 3. The posture can be changed between a sitting posture in which 4 is lying horizontally (indicated by a solid line in FIG. 1) and an upright posture (indicated by an alternate long and short dash line in FIG. 1). It is configured as follows. In addition, the chair 1 changes the posture of the seat body 4 from the sitting posture to the standing posture or from the standing posture to the sitting posture when the user is seated and when the user enters and leaves the seat. Thus, it is used so as to assist the user in standing up or sitting down.

  The base 2 has a beam 6 erected between the upper ends of the four columns 5, a pair of armrests 7, 7 on the left and right sides, and a backrest 8 on the rear.

  The elevating mechanism 3 has a pair of front and rear drive motors 9 and 10 attached to the inner side of the left and right beams 6, and pinion gears 11 and 12 are attached to the drive shafts of the drive motors 9 and 10. Arc-shaped rack gears 13 and 14 are attached to each other at an interval in the front-rear direction, and the rack gears 13 and 14 and the pinion gears 11 and 12 are engaged with each other. By driving the drive motors 9 and 10, the rack gears are driven by the pinion gears 11 and 12. 13 and 14 are moved up and down to raise and lower the seat body 4.

  Here, as shown in FIG. 4, the rack gears 13 and 14 are located at a position in front of the front end portion of the seat body 4 and above the seat surface of the seat body 4 at a virtual point 15 (note that the side surface A gear is formed on the outer peripheral portion of an arc-shaped plate having a predetermined radius centered on the virtual point 15. Therefore, the front rack gear 13 has a smaller diameter than the rear rack gear 14. Here, the position of the virtual point 15 is a position above the seat surface of the seat body 4, but may be a position having the same height as the seat surface of the seat body 4.

  The seat body 4 is formed with notches 16 and 16 at the center of the left and right edges, and the notches 16 and 16 are engaged with guide rails 17 and 17 attached to the inner side of the armrests 7 and 7, whereby the guide rail 17 , 17.

  Here, the guide rails 17 and 17 are also formed in an arc shape having a predetermined radius with the virtual point 15 as the center.

  Therefore, when the chair 1 drives the drive motors 9 and 10 of the elevating mechanism 3, the seat body 4 moves along the left and right guide rails 17 and 17 with the virtual point 15 as the rotation center, and the seat body 4 becomes horizontal. The posture is changed between a lying seated posture and a standing posture standing up and down at the front, rear and rear height.

  As described above, in the chair 1 configured as described above, the virtual point 15 is rotated at a position in front of the front end portion of the seat body 4 and at the same height as the seat surface of the seat body 4 or a position above the seat surface. The seat body 4 is moved along the left and right guide rails 17 and 17 as the center, and the front end portion of the seat body 4 is moved upward from the seating posture in the standing posture.

  As described above, the chair 1 configured as described above is configured such that the front end portion of the seat body 4 is moved upward from the seating posture in the standing posture. The movement of the upper thigh of the user's foot can be approximated, the burden on the user's knee can be reduced, and a seating structure that is easy to use can be provided.

  Further, in the chair 1 having the above-described configuration, the seat body 4 is positioned at a position forward of the front end portion of the seat body 4 and at the same height as the seat surface of the seat body 4 or a position above the seat surface. Since it is configured to move, the movement of the seat body 4 and the movement of the upper leg of the user's foot can be substantially matched when the posture is changed, and the burden on the user's knee is further increased. The seating portion structure can be reduced and can be easily used.

  Further, in the chair 1 configured as described above, the seat body 4 can be changed in posture along the pair of left and right guide rails 17 and 17 formed in an arc shape with a predetermined radius from the rotation center. The posture of the seat body 4 can be smoothly changed along the guide rails 17 and 17 while simplifying and reducing labor and cost required for manufacturing.

1 Chair 2 Base 3 Lifting mechanism 4 Seat 5 Strut 6 Beam 7 Armrest 8 Backrest
9,10 Drive motor 11,12 Pinion gear
13,14 Rack gear 15 Virtual points
16 Notch 17 Guide rail

Claims (1)

In the seating part structure configured to be able to change the posture into a sitting posture in which the seat body is lying down horizontally and an upright posture in which the seat body stands in an inclined state of low front and rear heights,
It is configured to move the front end of the seat body upward from the sitting posture in a standing posture,
At a position in front of the front edge of the seat body and above the seat surface of the seat body, and when the posture is changed, the movement of the seat body and the knee joint of the user's foot is the center of rotation. Configure the seat to move around the center of rotation that matches the thigh movement ,
A pair of left and right drive motors for changing the posture of the seat is attached to the inside of the left and right beams, and a pinion gear is attached to each drive motor, while a rack gear is attached to the left and right sides of the back of the seat, and each rack gear and pinion gear is attached. And
A seating portion structure characterized in that a posture of the seat body can be changed along a pair of left and right guide rails formed in an arc shape having a predetermined radius from the rotation center .

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