JP2006000360A - Legless chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a legless chair free from shift of sitting position from an initial sitting position irrespective of the tilting angle of a back rest or even if it is used for a long time. <P>SOLUTION: The legless chair is provided with a seat 1 and the back rest 2 that can be freely tilted relative to the seat 1. The seat 1 has a round hole 3 formed in the center of a seat face and has a low repulsion cushion member 5 provided right below a top side surface layer cover member 4 in the vertical cross-section of the seat 1. The low-resilient cushion member 5 provided at a part ranging from the inner periphery side of the round hole 3 to the outer periphery side 12 of the seat 1 in the vertical cross-section of the seat 1. The inner diameter of the round hole 3 is gradually increased towards the seat face 11 side. The low repulsion cushion member 5 is disposed in an arcuate shape ranging from the inner periphery side of the round hole 3 to the outer periphery side 12 of the seat in the vertical cross-section of the seat 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seat chair provided with a seat portion and a back portion that is tiltable with respect to the seat portion.

This kind of seat chair is used by changing the degree of inclination of the back part relatively freely according to preference, and placing the buttocks on the seat part, but since the seat surface of the seat part is flat, the inclination angle is As the angle approaches 45 degrees, the buttocks slide on the seat surface from the initial set position and shift toward the toes, resulting in an uncomfortable feeling in sitting comfort and in some cases pain.
In particular, when used for a long time, it is necessary to correct the posture for adjusting the sitting position several times.

  An object of the present invention is to provide a seat chair that is less likely to be displaced from the initial sitting position regardless of the inclination angle of the back portion or even when used for a long time.

  The invention of the seat chair according to claim 1 is a seat chair comprising a seat portion and a back portion that is tiltable with respect to the seat portion, wherein the seat portion has a circular hole in the center of the seat surface, and the seat portion. It has the low-rebound cushion member arrange | positioned just under the upper surface side surface layer cover member in the vertical cross section of this.

The invention according to claim 2 is the seat chair according to claim 1, wherein the low resilience cushion member is disposed from the inner peripheral surface side of the circular hole to the outer peripheral surface side of the seat portion in the vertical cross section of the seat portion. It is characterized by.

The invention according to claim 3 is the seat chair according to claim 1 or 2, characterized in that the circular hole has a shape in which the inner diameter gradually increases toward the seat surface.

  According to a fourth aspect of the present invention, in the seat chair according to any one of the second to third aspects, the low resilience cushion member is an outer peripheral surface of the seat portion from the inner peripheral surface side of the circular hole in the vertical cross section of the seat portion. It is characterized by being arranged in an arc shape toward the side.

  According to the first aspect of the present invention, since the circular hole is provided on the seating surface of the seat portion so that the buttocks fall, the position of the buttocks in the front-rear and left-right directions (herein, “front” refers to the foot tip direction) Since the low-rebound cushion member is disposed directly below the surface layer cover member of the seat surface, the collar portion can be received by the seat portion in a shape corresponding to the shape of the collar portion. Misalignment can be prevented and initial sitting comfort can be maintained for a long time.

According to the invention of claim 2, since the low resilience cushion member is disposed from the inner peripheral surface side of the circular hole to the outer peripheral surface side of the seat portion, even if the collar portion is large enough to protrude from the seat surface. The effects of the invention of claim 1 can be exhibited.
Further, when the seat is used as a pillow, the low resilience cushion member receives the back of the head and the back of the neck in a shape corresponding to the shape thereof, so that it can be comfortably used as a pillow.

According to the invention of claim 3, since the inner diameter of the circular hole gradually increases toward the seat surface side, the edge on the upper end side of the circular hole does not hit the collar part unnecessarily, and a comfortable installation feeling can be obtained. it can.

According to the invention of claim 4, since the low-rebound cushion member is arranged in an arc shape from the inner peripheral surface side of the circular hole to the outer peripheral surface side of the seat portion, the cushioning property in the direction perpendicular to the seat surface can be improved. In addition, it is possible to effectively prevent the right and left shift of the buttocks.

  Hereinafter, the present invention will be described by taking as an example an embodiment of a seat chair provided with a seat portion and a back portion that is tiltable with respect to the seat portion.

1 is a partially cutaway perspective view of a seat chair, and FIG. 2 is an enlarged end view of a section of the seat chair.
In FIG. 1, reference numeral 1 is a seat portion, and 2 is a tiltable back portion whose angle can be freely adjusted in a range from a vertical state to a horizontal state with respect to the seat portion 1.

In FIG. 1, the seat portion 1 is provided with a circular hole 3 penetrating in the vertical vertical direction at the center of the seat surface 11. This circular hole 3 is provided with a collar portion that is placed on the seat surface 11 of the seat portion 1, and at least a hole in which the center of the collar portion falls shallowly or a bottomed depression (hereinafter collectively referred to as a circular hole), 11, the position of the buttocks in the front-rear and left-right directions (herein, the front means the toe direction) is prevented.

The illustrated circular hole 3 has a so-called trumpet shape in which the inner diameter gradually increases from the inner side of the hole toward the seating surface 11 side.
The edge on the upper end side of the circular hole 3, that is, the opening edge portion 31 does not unnecessarily hit the collar portion, and is formed so as to obtain a comfortable feeling of installation. Of course, the opening edge (edge) 31 on the upper end side of the circular hole 3 is not limited to the illustrated shape.
In addition, the code | symbol 4 in a figure is the upper surface side surface layer cover member made from the cloth or resin which covers the surface of the seat surface 11 of the seat part 1. FIG.

As shown in FIGS. 1 and 2, in the vertical section of the seat portion 1, the urethane foam as a general cushion member having a normal repulsive force is not directly below the upper surface-side cover member 4, but a normal follower. A low-repulsion cushion member 5 having a repelled force that is weaker than the above-described one is disposed, for example, a low-resilience urethane foam is laid.
Thereby, since the collar part can be received by the seat part 1 in a shape corresponding to the shape of the collar part, it is possible to further prevent displacement and to maintain the initial sitting comfort for a long time.

Further, the low resilience cushion member 5 is formed from the inner peripheral surface side of the circular hole 3 in the vertical cross section of the seat portion 1, for example, from the opening edge (edge) 31 side of the upper end side of the circular hole 3 that is touched by a flange not shown. It is good to arrange | position over the outer peripheral surface side 12 of the seat part 1. FIG.
Thereby, even if the collar portion is large enough to protrude from the seat surface 11, the collar portion can be received by the seat portion 1 in a shape corresponding to the shape of the collar portion on the outer peripheral surface side 12 of the seat portion 1. It is possible to prevent slippage and to maintain the initial sitting comfort for a relatively long time.

In addition, when the seat portion 1 is used as a pillow, the low resilience cushion member 5 is received by the outer peripheral surface side 12 of the seat portion 1 in a shape corresponding to the shape of the back of the head and the back neck. it can.

Furthermore, the low resilience cushion member 5 shown in this example has a high center in the length direction from the inner peripheral surface side (31) of the circular hole 3 to the outer peripheral surface side 12 of the seat portion 1 in the vertical cross section of the seat portion 1. It is arrange | positioned so that it may become arc shape as a whole.
Thereby, not only can the cushioning property in the vertical direction with respect to the seating surface 11 of the seat portion 1 be improved, but also the displacement of the front and rear left and right directions of the collar portion can be more effectively prevented.

1 and 2, reference numeral 6 denotes a middle-layer cushion member, which is a member disposed immediately below the low-repulsion cushion member 5 in the vertical section of the seat portion 1, and maintains the form of the seat portion 1. Make a part.
Accordingly, since the low-rebound cushion member 5 is a member disposed so as to cover the upper surface side of the middle-layer cushion member 6, if the cross-sectional shape of the middle-layer cushion member 6 is formed into a desired shape, the low-rebound cushion member 5 The cushion member 5 may be a sheet-like member having an appropriate thickness evenly.

For example, as shown in the drawing, if the cross-sectional shape of the middle-layer cushion member 6 is elliptical, a sheet-like low-rebound cushion having an equal thickness on the upper surface side of the region obtained by dividing the outer surface of the middle-layer cushion member 6 vertically into two. The low resilience cushion member 5 can be disposed from the opening edge (edge) 31 side on the upper end side of the circular hole 3 to the outer peripheral surface side 12 of the seat portion 1 by simply overlapping the members 5 and bonding them. From the inner peripheral surface side (31) of the circular hole 3 to the outer peripheral surface side 12 of the seat portion 1 in the vertical cross section of the portion 1, the center in the length direction can be high so as to be arcuate as a whole.
As the above-mentioned middle layer cushion member 6, for example, a so-called chip foam in which used urethane foam is hardened on a chip is used as a cushion member harder than the low resilience cushion member 5 or a general urethane foam described later. ing.

In FIG. 1 and FIG. 2, reference numeral 7 denotes a frame pipe constituting the skeleton of the seat portion 1, and this frame pipe 7 is disposed in a return shape in the middle layer cushion member 5 so as to go around the circular hole 3. . Generally, since the frame pipe 7 is made of metal, it is preferable to dispose the frame pipe 7 on the lower side of the middle-layer cushion member 5 in the vertical cross section because the presence of the frame pipe 7 is not felt in the collar portion.
Reference numeral 8 denotes a tape constituting the sub skeleton of the seat 1 and is stretched in a tensioned state between a part of the return frame pipe 7.

Further, in FIGS. 1 and 2, reference numeral 9 denotes a lower side cushion member disposed on the bottom surface side of the seat portion 1, that is, in this example, the lower surface side of the region obtained by dividing the outer surface of the middle layer cushion member 5 into two vertically. Yes, as this lower layer side cushion member 9, in this example, urethane foam as a general cushion member having a normal repulsive force is used.
Thus, the upper layer side of the upper half of the middle layer cushion member 5 is covered with the low resilience cushion member 5 and the lower surface side of the lower half is covered with urethane foam as a general cushion member.

INDUSTRIAL APPLICABILITY The present invention can be effectively used in a seat chair that is used by changing the inclination of the back portion relatively freely according to preference and placing the buttocks on the seat portion.

It is a partially cutaway perspective view of a seat chair. It is an expanded end elevation of the partial cross section of a seat chair.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat part 2 Back part 3 Circular hole 4 Upper surface side surface cover member 5 Low-rebound cushion member 11 Seat surface 12 Outer peripheral surface side (seat part)
31 Opening edge (Round hole edge)

Claims (4)

A seat chair including a seat portion and a back portion that is tiltable with respect to the seat portion, wherein the seat portion has a circular hole in the center of the seat surface, and directly below the upper surface side surface cover member in a vertical cross section of the seat portion. A seat chair comprising a low resilience cushion member disposed on the seat. The seat chair according to claim 1, wherein the low resilience cushion member is disposed from the inner peripheral surface side of the circular hole to the outer peripheral surface side of the seat portion in the vertical cross section of the seat portion. The seating chair according to claim 1 or 2, wherein the circular hole has a shape in which an inner diameter is gradually enlarged toward a seating surface side. The low-rebound cushion member is disposed in an arc shape from the inner peripheral surface side of the circular hole to the outer peripheral surface side of the seat portion in the vertical cross section of the seat portion. Seat chair.

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