JP4238081B2 - Chair seat structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat structure of a chair in which a net member is stretched on a seat frame.
[0002]
[Prior art]
An elastically deformable net member or a porous sheet member (hereinafter referred to as a “net member” including the porous sheet member) made of a high-tensile plastic material or the like is formed on the seat frame. The seat structure of the attached chair is known.
The seat frame is generally rigid and usually has a substantially square cross section, and the upper surface supporting the peripheral edge of the net member is generally flat.
The peripheral edge of the net member is abutted and polymerized over the entire upper surface of the seat frame. When a load is applied to the net member, the net member bends and strongly hits the upper surface of the seat frame and its inner peripheral corner. Touch.
Therefore, the rigid upper surface and its inner peripheral corner strongly hit the back side of the thigh of the seated person, giving an uncomfortable feeling as well as a feeling of pressure.
In particular, when the periphery of the net member is not evenly fixed with sufficient tension, the flexure of the net member is large, and the pressure and discomfort of the seated person increase.
[0003]
In response to this, the applicant of the present application provides an overhanging piece that elastically deforms on the rear side of the upper surface with which the rear side of the seated person's thigh abuts, and attaches a tightening frame to the lower side of the seat frame, The invention has been made to reduce the feeling of pressure by applying a large tension to the net member with the tightening frame (Patent Documents 1, 2, and 3).
On the other hand, a chair in which a cushion material is embedded in a part of the upper surface of the seat frame has also been proposed (Patent Document 4).
[0004]
[Patent Document 1]
Japanese Patent Application No. 2002-213450 (refer to claim 1)
[Patent Document 2]
Japanese Patent Application No. 2002-213451 (see FIGS. 4 and 5)
[Patent Document 3]
Japanese Patent Application No. 2002-281552 (refer to claim 1, FIG. 7)
[Patent Document 4]
Special table hei 8-507935 (see FIG. 33)
[0005]
[Problems to be solved by the invention]
Although the thing described in the said patent document 4 uses the cushioning material, although the said feeling of pressure etc. is eased to some extent, since a seat frame is essentially scarce in elastic deformation, it is still fully satisfied. It is not possible.
The present invention relates to an improvement of the invention proposed by the applicant of the present invention in the above-mentioned Patent Documents 1, 2, and 3. When the seated person inclines the backrest backward or takes a forward bending posture, etc. The purpose of the present invention is also to provide a seat structure for a chair that is as comfortable as possible without giving a feeling of pressure or discomfort to the back of the thigh as much as possible.
[0006]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) In the seat structure of a chair in which a net member is stretched on the upper surface of the seat frame, the seat frame is directed to the inside from the frame-shaped rigid outer periphery and the inner edge of the front outer periphery. A cushion material support portion extending in a horizontal direction at a position lower than the upper surface of the portion, and a thick cushion material facing in the left-right direction is fixed on the cushion material support portion, and the upper surface of the cushion material is The seat structure of the chair is made to protrude upward from the upper surface of the portion and the net member is stretched on the upper surfaces of both the cushion material and the outer peripheral portion.
[0007]
(2) above (1) Oite to claim, the cushion member supporting portion, and thin, to be elastically deformable in the vertical direction.
[0008]
( 3 ) In the above ( 2 ), the cushion material support portion is provided with a plurality of slits facing forward from the rear edge, and a flexible tongue piece that can be inclined elastically between adjacent slits is provided. Form.
[0009]
( 4 ) In the above item ( 3 ), among the plurality of flexible tongue pieces, the one located at the center in the left-right direction is assumed to be gradually longer than the other flexible tongue pieces.
[0010]
( 5 ) In the above item ( 3 ) or ( 4 ), a stop hole for preventing the incision from progressing is provided at the back end of the incision slit.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view of a chair (A) including a seat structure according to an embodiment of the present invention.
2 is a lower perspective view of the seat (B) in FIG. 1, and FIG. 3 is an exploded perspective view of the same.
[0012]
The seat (B) has a peripheral portion (3a) of a net member (3) such as high-tensile plastic on the upper surface (2a) of the outer peripheral portion (2) of a rectangular frame-shaped seat frame (1) having a closed structure. After the polymerization, the peripheral edge (3a) is bent downward to be superposed on the upper surface (2a) and the outer surface (2b) of the outer peripheral portion (2) of the seat frame (1), and further the lower surface of the outer peripheral portion (2). Bend inward along (2c), and tighten and tighten the fastening frame (4) that forms a rectangular frame with the same closed structure as the seat frame (1) on the bottom surface of the inwardly bent portion. Bolts (6) inserted from below the through holes (5) drilled at various locations on the frame (4) are screwed into the screw holes (7) drilled at corresponding locations on the lower surface (2c) of the seat frame (1). By joining together, the inwardly turned portion of the net member (3) is fixed to the lower surface (2c) of the seat frame (1).
[0013]
A cushion member (8) is provided on the upper surface of the front part (2d) of the seat frame (1) and, as will be described later, in order to give the net member (3) sufficient tension, the net member (3) An edge member (9) is press-fitted between the peripheral edge (3a) of the rim and the outer surface (2b) of the seat frame (1).
[0014]
4 is an exploded top perspective view of the frame member (1) and the cushion member (8), and FIG. 5 is an enlarged vertical sectional view taken along line V-V in FIG.
[0015]
The seat frame (1) in the present invention is formed of a hard plastic or a suitable metal and has a rectangular frame-shaped outer peripheral portion (2) formed of a thick rigid material and an outer peripheral portion (2) of the front portion (2d). ) From the inner edge (2e) of the outer peripheral portion (2) toward the inward direction, and a thin cushion material support portion (10) extending in the horizontal direction at a position lower than the upper surface (2a) of the outer peripheral portion (2).
[0016]
The cushion material support (10) is provided with a plurality of slits (11) facing forward from the rear edge, and can be elastically inclined between adjacent slits (11) (11). A flexible tongue (12) is formed.
[0017]
In order to obtain the desired flexibility of the flexible tongue piece (12), its thickness may be gradually reduced toward the distal end. Note that a circular stop hole (13) having a diameter larger than its width is provided at the back end of the slit (11) in order to prevent the progress of the slit.
[0018]
As shown in FIG. 5, the tip of each flexible tongue (12) is bent upward to form a fall prevention piece (14) to prevent the cushion material (8) from moving and dropping. In addition, a bulging portion (15) is attached to the tip for reinforcement.
[0019]
The flexible tongue piece (12) has a progressively longer length as it is located at the center in the left-right direction where the load of the seated person is applied, and balances the cushion action by elastic deformation.
[0020]
Instead of the incision slit (11), a plurality of grooves having a V-shaped cross section may be provided, and a space between them may be a flexible tongue. Furthermore, in order to make the flexibility of the flexible tongue piece (12) desired, a thin portion or a wave that faces in the lateral direction or other directions may be attached at an appropriate position.
[0021]
On the cushion material support portion (10), a thick cushion material (8) made of polyurethane or the like facing in the left-right direction is fixed, and the upper surface (8a) of the cushion material (8) is attached to the outer periphery of the seat frame (1). By projecting upward from the upper surface (2a) of the part (2), the upper surface (2a) of the outer peripheral part (2) strongly hits the rear side of the occupant's thigh so as not to give a feeling of pressure. It is.
[0022]
The peripheral part (3a) of the net member (3) is formed between the lower surface (2c) of the outer peripheral part (2) of the seat frame (1) and the upper surface of the fastening frame (4) as follows. It is held.
[0023]
As shown in FIG. 5, the outer peripheral part (2) of the seat frame (1) is a rigid thick part, and the lower surface (2c) of the outer peripheral part (2) is threaded from the inside. (7) A locking annular groove (16) and a tightening annular groove (17) are provided.
[0024]
On the other hand, on the upper surface of the fastening frame (4), from the inside, the through hole (5), the upward biting ridge (18), and the outer surface (2b) of the outer peripheral portion (2) of the seat frame (1) An upward protective flange (19) which can be polymerized is provided.
[0025]
On the other hand, a flexible edge member (20) is attached to the peripheral edge (3a) of the net member (3), and this edge member (20) is attached to an annular groove (1) for locking the seat frame (1). 16) Push it into the clamping frame (4) so that the biting ridge (18) in this clamping frame (4) bites into the annular groove (17) of the seat frame (1). The seat frame (1) and the fastening frame (4) are fitted together, the bolt (21) is inserted through the hole (5) from below, and the screw hole (7) is tightened. Then, the peripheral edge (3a) of the net member (3) is pushed into the locking annular groove (16) by the biting ridge (18), and the protective flange (19) and the seat frame (1). Is strongly held by both the outer surface (2b) of the outer peripheral portion (2) and the peripheral edge (3a) of the net member (3) is uniformly fixed with sufficient tension, so that the seat frame (1) Firmly stretched on top.
[0026]
Subsequently, as shown by an arrow T in FIG. 5, the edge member (9) is moved from the inside between the net member (3) and the seat frame (1) to the outer peripheral portion (2) of the seat frame (1). The net member (3) can be more firmly stretched by pushing it to a position where it abuts against the outer side surface (2b).
[0027]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) According to the invention described in claim 1, since the cushion material support portion is extended in the horizontal direction at a position lower than the upper surface of the outer peripheral portion, the cushion material can be made significantly thicker. Since the upper surface of the thick cushion material protrudes upward from the upper surface of the outer peripheral portion and is fixed to the cushion material support portion, when the seated person tilts the backrest backward, Even when taken, the back of the thigh does not give a feeling of pressure or discomfort, and the sitting comfort is good.
[0028]
( 2 ) According to the invention described in claim 2 , both the elastic deformation of the cushion material support portion and the cushion action of the cushion material are combined, and the effect described in the item (1) is further improved. .
[0029]
( 3 ) According to the invention described in claim 3 , the cushion material support portion can be elastically deformed with a simple structure.
[0030]
( 4 ) According to the invention described in claim 4, the left and right center where the load of the seated person is easily applied can be elastically deformed widely and uniformly in the front-rear direction, and the effect described in item (1) can be obtained. Played efficiently.
[0031]
( 5 ) According to the invention described in claim 5, it is possible to obtain a cushion material support portion that is capable of preventing the progress of the incision of the incision slit, being excellent in durability, and capable of excellent elastic deformation.
[Brief description of the drawings]
FIG. 1 is a side view of a chair provided with a seat structure according to an embodiment of the present invention.
FIG. 2 is a lower perspective view of the seat structure of the chair shown in FIG.
3 is a lower exploded perspective view of the seat structure of the chair shown in FIG. 2. FIG.
4 is an upper exploded perspective view of a frame member and a cushion member in the seat structure of the chair shown in FIG. 3. FIG.
FIG. 5 is an enlarged vertical sectional view taken along line V-V in FIG. 2;
[Explanation of symbols]
(1) Seat frame
(2) Outer periphery
(2a) Top surface
(2b) Outer surface
(2c) Bottom surface
(2d) Front
(2e) Inner edge
(3) Net members
(3a) Perimeter
(4) Tightening frame
(5) Through hole
(6) Bolt
(7) Screw hole
(8) Cushion material
(9) Edge material
(10) Cushion material support
(11) Cut slit
(12) Flexible tongue
(13) Stop hole
(14) Fall prevention piece
(15) bulge
(16) Annular groove for locking
(17) Tightening annular groove
(18) Biting ridge
(19) Protective flange
(20) Edge material
(21) Bolt

Claims (5)

In the seat structure of a chair in which a net member is stretched on the upper surface of the seat frame, the seat frame is directed inward from the frame-shaped rigid outer peripheral portion and the inner edge of the outer peripheral portion of the front portion. At a lower position, a cushion material support portion extending in the horizontal direction is formed, and a thick cushion material facing in the left-right direction is fixed onto the cushion material support portion, and the upper surface of the cushion material is fixed to the upper surface of the outer peripheral portion. A seat structure for a chair, characterized in that a net member is stretched upward from both the cushion material and the outer peripheral portion. The cushion member supporting portion, and thin, the seat structure according to claim 1 Symbol mounting of the chair is characterized in that the elastically deformable in the vertical direction. The cushion member supporting portion, provided thereafter a plurality of cuts slits facing forward from the edge, between adjacent cuts slits, characterized in that the formation of the flexible tongue which can be elastically where the downward claim 2 The seat structure of the described chair. 4. The chair according to claim 3, wherein among the plurality of flexible tongue pieces, the one located at the center in the left-right direction has a gradually longer length than the other flexible tongue pieces. Seat structure. The seat structure for a chair according to claim 3 or 4, wherein a stop hole is provided at a rear end of the slit for preventing the slit from progressing.

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