JP7049714B1 - Cushion for chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the buttocks of an elderly person or a physically handicapped person who has weakened back muscles and abdominal muscles from shifting forward by forming an anchor projecting from the lower surface of a cushion placed on a seat surface of a chair. Further, since the upper surface of the cushion is a flat surface and the buttocks do not sink and the lumbar spine does not bend, a cushion for a chair that can properly maintain the sitting posture without imposing a burden on the lower back is provided. SOLUTION: An anchor 6 that is in pressure contact with a seat surface is provided on a lower surface 2D of a cushion body 2 placed on a seat surface of a chair. The anchor 6 has a trapezoidal shape with the upper surface and the lower surface 6B in a plan view, and is composed of a solid having four front and rear and left and right side surfaces 6C, 6D, and 6E. The wide front side surface 6C located in the center of the cushion body 2 in the lateral width direction is arranged toward the front side of the cushion body 2, and the narrow rear side surface 6D is arranged toward the rear side of the cushion body 2. [Selection diagram] FIG. 6

Description

INDUSTRIAL APPLICABILITY The present invention is a cushion for a chair that can maintain the ischial bone of a seated person in the correct position and state by arranging it on the seat surface of a chair, wheelchair, etc. Regarding.

When seated in a chair, including a wheelchair, it is necessary to maintain the correct position of the ischial bones and thighs of the seated person on the seat surface in order to maintain the correct posture. More specifically, as shown in FIG. 10, the ischium and thigh of the seated person P are correctly held with respect to the seating surface C1 of the chair _C , so that the lumbar spine, spinal cord, and cervical spine are stacked in a gentle S shape. It goes up and the head is positioned on it to form the correct posture.
However, when the muscle strength of the back muscles and abdominal muscles weakens due to aging or lack of exercise, the ischium tends to tilt backward, and when tilted backward, the functional S-shaped curve of the spine changes to a C-shaped curve, as shown in FIG. It becomes a so-called round spine (bad posture) as shown. This poor posture increases the risk of developing bed sore in the tailbone and promotes deformity of the lower limbs and spinal column, resulting in serious health damage, especially for the elderly and disabled.

Therefore, in recent years, it is necessary to support the ischium in the correct position in order to prevent the ischium and thigh from gradually shifting forward and the posture from becoming a cat-back state and damaging the lumbar spine and spine, and to maintain the correct posture. From the viewpoint of ergonomics, the idea of supporting the sacrum and the ischium in the correct position in order to support the ischium in the correct posture is being studied.

Specifically, by arranging the flat plate 5 on the lower surface of the cushion material 3 and making the thigh seat surface 2 cm or more thicker than the buttock seat surface, the buttock portion moves forward when sitting on a chair or wheelchair. A cushion that prevents slippage has been proposed (Patent Document 1). Further, by integrating the cushioning material 2 on the anchor material 1 made of plastic foam and making the thickness of the anchor material located under the ischium thinner than that of the anchor material located under the thigh, the posture is tilted backward when seated. A cushion for maintaining a sitting posture has been proposed. In this cushion, the anchor material is provided with an opening in a portion located below the ischium so that the coccyx and the ischium do not repel from the seat surface (Patent Document 2).

Further, the urethane foam A is provided with a rectangular urethane foam A, a urethane foam B having a thickness 1.3 to 1.5 times that of the urethane foam A, and a urethane foam C formed thinner than the urethane foam B. A cushion has been proposed in which B and C are attached to the lower surface of the urethane foam A side by side and the hardness of the urethane foam is C> B> A to prevent the seated person of the wheelchair from slipping forward. (Patent Document 3).

JP-A-2002-85207 Japanese Unexamined Patent Publication No. 2012-29998 Utility Model Registration No. 3106227

The prior arts of Patent Documents 1 to 3 described above are aimed at preventing the buttocks of a seated person in a chair or wheelchair from shifting forward and stabilizing the posture. However, in each of the prior arts, the buttocks are positioned below the thighs, that is, the buttocks are dropped from the thighs, and the lumbar vertebrae are bent in a dogleg shape, and the seating time is long. If it is long, there is a problem that the state of bending continues for a long time and the lower back is hurt.

The present invention has been made in view of the above-mentioned problems of the prior art, and the strength of the spine and abdominal muscles is reduced by forming the anchor so as to project from the lower surface of the cushion placed on the seat surface of the chair. It prevents the buttocks of the elderly and people with physical disabilities from shifting forward, and the upper surface of the cushion is a flat surface so that the buttocks do not sink and the lumbar spine does not bend, so the posture when sitting is appropriate without burdening. It is intended to provide a cushion for chairs that can be held in.

(1) The means of the present invention according to claim 1 configured to solve the above-mentioned problems is formed by molding a cushion body to be placed on the seat surface of a chair and a material harder than the cushion body, and the lower surface of the cushion body. It is a cushion composed of an anchor provided on the seat surface and pressed against the seat surface. The anchor has a trapezoidal shape on the upper surface and the lower surface in a plan view, and the lower surface is set smaller than the upper surface. It consists of a three-dimensional structure with four front, rear, left and right side surfaces inclined downward, and is located in the center of the cushion body in the lateral width direction, with the wide front side surface on the front side of the cushion body and the narrow rear side surface on the cushion body. It consists of a configuration arranged toward the rear side.
(2) Further, the cushion body may be formed of three layers: a soft upper layer, an intermediate layer harder than the upper layer, and a lower layer harder than the intermediate layer.
(3) The cushion body and the anchor may be integrally covered with a cover.
(4) Further, the cover may be composed of a waterproof inner cover body and an outer cover body that covers the inner cover body.
(5) Further, in the outer cover body, the lower surface in contact with the seat surface may be processed into a non-slip surface.

(1) The chair cushion placed on the seat surface of the chair supports the buttocks and thighs of the seated person in an appropriate position, so that the ischium does not tilt backward and the correct posture that does not become a stoop can be maintained. can.
(2) Since the anchor has a wide front side facing the front side of the seat surface and a narrow rear side surface facing the rear side of the seat surface, the buttocks and thighs of the seated person shift forward. Can be prevented.
(3) Since the lower surface of the anchor is set to be smaller than the upper surface and the four side surfaces are formed on the downward inclined surface, the anchor does not press the thigh portion where the seating surface side expands by sitting.
(4) The cushion body has an upper layer that is soft to the seated person, an intermediate layer that supports the upper layer by making it harder than the upper layer, and the influence of the bending of the seat surface is reduced, and the pushing force of the anchor is increased. Since it is molded from the three layers of the lower layer, which has a hardness transmitted upward, the function of the anchor can be exerted to the seated person without any discomfort and with certainty.
(5) Since the cushion body and the anchor are integrally covered with the cover, the cushion body and the anchor are protected from damage and dirt due to friction.
(6) Since the outer cover body has a non-slip surface processed on the lower surface, it is possible to prevent the chair cushion from shifting in the front-rear direction from the seat surface even in a wheelchair in which the seated person moves a lot.

FIG. 1 is a front view of a cushion for a chair according to an embodiment of the present invention. It is a rear view of a cushion for a chair. It is a side view of a cushion for a chair. It is a bottom view of an anchor. It is a side view of an anchor. It is a bottom view which shows the arrangement position of a cushion body and an anchor. It is a front side perspective view which shows by breaking a part of the cushion for a chair. It is a side view of a cushion for a chair. It is a schematic diagram which shows the positional relationship between a seated person, a cushion body and an anchor. It is a state diagram of the posture properly seated on the chair. It is a state diagram of a poor posture when the ischium is tilted backward and seated.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIGS. 1 to 3, 1 is a cushion for a chair, and 2 is a cushion body made of urethane constituting the cushion 1 for a chair. The cushion body 2 is composed of a quadrangular cube having a front surface 2A, a rear surface 2B, and left and right side surfaces 2C and 2C having a length L of, for example, about 40 cm and a thickness T of about 6 cm. The cushion body 2 is composed of a laminated body of three layers, an upper layer 3, an intermediate layer 4, and a lower layer 5, each having a thickness T ₁ of about 2 cm, and the intermediate layer 4 is somewhat relative to the soft upper portion 3. A hard material is used, and the lower layer 5 is molded with urethane chips, so that the hardness is set to the relationship of upper layer 3 <intermediate layer 4 <lower layer 5.

As described above, the upper layer 3 is set to be soft in order to soften the contact with the buttocks (ischium) and the thigh of the seated person, and the intermediate layer 4 is made hard to support the upper layer 3. By making the lower layer 5 harder than the intermediate layer 4, it is possible to minimize the influence of the bending of the seat surface of the chair C (the state of becoming a ship bottom), and the pushing force of the anchor 6 described later is also reduced. This is to convey to the top without absorbing.

Reference numeral 6 indicates an anchor formed of a urethane tip and attached to the lower surface 2D of the cushion body 2. The anchor 6 has a trapezoidal upper surface 6A, a trapezoidal lower surface 6B smaller than the upper surface 6A, a front inclined surface 6C having a wide width, a rear inclined surface 6D having a width narrower than the front inclined surface 6C, and left and right sides. It is formed into a trapezoid body from the inclined surfaces 6E and 6E.

As an example, the dimensions of the anchor 6 described above are such that the trapezoidal upper surface 6A has a front width W ₁ of about 9 cm, a rear width W ₂ of about 5 cm, and a length L ₁ of about 13.5 cm. On the other hand, the trapezoidal lower surface 6B has a front width W ₃ of about 6 cm, a rear width W ₄ of about 3 cm, and a length L ₂ of about 9.5 cm. The thickness T ₂ of the anchor 6 is set to about 2 cm, and the front side surface 6C, the rear side surface 6D, the side surface 6E, and 6E between the upper surface 6A and the lower surface 6B are inclined surfaces facing diagonally downward.
FIG. 6 shows the arrangement position of the anchor 6 with respect to the cushion body 2, and is positioned on the front side from the center line CC of the length in the front-rear direction of the cushion body 2. This positional relationship is for positioning the anchor 6 between the crotch and the left and right thighs.

Reference numeral 7 indicates a cover that integrally covers the cushion body 2 and the anchor 6. The cover 7 is composed of a waterproof inner cover body 8 and an outer cover body 9 that covers the inner cover body 8. The inner cover body 8 is formed of a waterproof material to prevent the action body 2 from becoming dirty due to incontinence or the like.

The outer cover body 9 that covers and protects the inner cover body 8 is composed of an upper cover portion 9A and a lower cover portion 9B, and is configured in a bag shape that can be opened and closed by providing zippers 10 diagonally downward from the top on both side surfaces. Therefore, the inner cover body 8 can be easily taken in and out.
Further, silicon is scattered on the lower surface of the lower cover portion 9B, and the non-slip surface is processed.
The non-slip surface may be processed by applying silicon in a plurality of linear or strip shapes.

Next, the usage and operation of the chair cushion 1 will be described. The chair cushion 1 is placed on the seat surface ₁ of the chair C including the wheelchair with the anchor 6 facing down. The anchor 6 is positioned on the front side of the cushion body 2 as shown in FIG. 6, and the seated person is seated so that the anchor 6 is located between the crotch and the left and right thighs as shown in FIG.
Then, when the seated person sits deep in the seat surface, the backrest of the chair comes into contact with the back, and the backrest supports the sacrum. In addition, the anchor 6 supports the ischium to prevent slipping as shown in FIG. By supporting the sacrum and ischium, it prevents the body from leaning forward even when the body is weakened to some extent and cannot maintain a good posture.
In this way, the buttocks of the seated person are placed at an appropriate position in the rear half of the chair cushion 1, so that the ischium does not tilt backward and the buttocks do not shift forward.
Explaining in terms of the skeleton, the chair cushion 1 has a form in which the ischium is stabilized by supporting the ischium from the inside slightly anterior to the left and right ischia, and also exhibits a function of holding the left and right femurs straight forward. It is set to.

The dimensions such as the length and width of the cushion body 2 and the anchor 6 shown in the present embodiment are examples, and the present invention is not limited to these numerical values.

Further, in the present embodiment, the upper layer 3 and the intermediate layer 4 constituting the cushion body 2 are formed of urethane, and the lower layer 5 is formed of urethane chips, but the lower layer 5 is also formed by using, for example, an air cell or foamed gel. It may be.

1 Cushion for chair 2 Cushion body 3 Upper layer 4 Middle layer 5 Lower layer 6 Anchor 7 Cover 8 Inner cover body 9 Outer cover body

Claims (5)

A cushion composed of a cushion body to be placed on the seat surface of a chair and an anchor formed of a material harder than the cushion body and provided on the lower surface of the cushion body to press-contact the seat surface.
The upper surface and the lower surface of the anchor have a trapezoidal shape in a plan view, and by setting the lower surface smaller than the upper surface, the anchor body is composed of a three-dimensional object in which the front and rear and four left and right side surfaces are inclined downwards. A chair cushion that is located in the center of the width direction and has a wide front side surface facing the front side of the cushion body and a narrow rear side surface facing the rear side of the cushion body. The cushion for a chair according to claim 1, wherein the cushion body is formed of three layers: a soft upper layer, an intermediate layer harder than the upper layer, and a lower layer harder than the intermediate layer. The chair cushion according to claim 1, wherein the cushion body and the anchor are integrally covered with a cover. The chair cushion according to claim 3, wherein the cover is composed of a waterproof inner cover body and an outer cover body that covers the inner cover body. The chair cushion according to claim 4, wherein the outer cover body has a lower surface in contact with the seat surface processed into a non-slip surface.

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