JP2004049685A - Seat structure of chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformly and easily fix the circumferential part of a net member to a seat frame at sufficient tension and strength in the seat structure of a chair. <P>SOLUTION: An insert piece 16 is fixed to the circumferential edge part of the net member 2, which is tensioned in the upper surface of the seat frame 1 and has its circumferential part inward folded via the upper surface and an outer side surface of the outer circumferential part of the seat frame 1. The insert piece 16 is fitted in a circumferential retainer groove 10 provided in the lower surface of the outer circumferential part of the seat frame 1 and the insert piece 16 is pushed in the retainer groove 10 with a fastening frame 3 fitted to the lower side of the seat frame 1 so as to apply the tension to the net member 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD 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. The seat structure of the present invention includes a seat and a backrest.
[0002]
[Prior art]
In a conventional chair seat structure in which an elastically deformable net member is stretched on a seat frame, a peripheral portion of the net member is superimposed on the seat frame, and the seat is held with a bolt or the like via a fastening holding member or directly. It is common to fasten it to a frame.
[0003]
[Problems to be solved by the invention]
It is not easy to fix the peripheral portion of the net member to the seat frame in the above-described conventional manner while applying a constant tension, it takes a lot of time and effort, and the vicinity of each tightening bolt etc. The tension of the net member becomes non-uniform, and the attachment portion of the net member is wrinkled or bent, and excessive tension acts on the net member around the tightening bolts and the like, and the net member is This part of the can tear.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to enable a peripheral portion of a net member to be fixed to a seat frame as uniformly and easily as possible with sufficient tension and strength.
[0005]
[Means for Solving the Problems]
According to the present invention, the above-mentioned problem is solved as follows.
(1) The sandwiching piece is stretched on the upper surface of the seat frame, and the peripheral portion is fixed to the peripheral portion of the net member that is folded inward through the upper surface and the outer surface of the outer peripheral portion of the seat frame. The insertion piece is fitted into a circumferential holding groove provided on the lower surface of the outer peripheral portion of the seat frame, and the insertion piece is inserted into the holding groove with a fastening frame attached to the lower side of the seat frame. By pushing in, the tension is applied to the net member.
[0006]
(2) In the above item (1), the lower end of the sandwiching piece is provided with a horizontal locking piece that receives the pressing force of the tightening frame and that can function for removal.
[0007]
(3) In the above (1) or (2), a circumferential holding groove is provided on the lower surface of the outer peripheral portion of the seat frame outside the holding groove, and a standing piece is provided at a corresponding position on the upper surface of the fastening frame. When the tightening frame is attached to the lower surface of the seat frame, the upright pieces push the peripheral portion of the net member into the holding groove to apply further tension to the net member. .
[0008]
(4) In any one of the above items (1) to (3), an upward protection flange which can be superposed on an outer portion of the seat frame is formed on an outer peripheral edge of the fastening frame.
[0009]
(5) In any one of the above items (1) to (4), the seat frame has an elastic piece that inclines downward from the upper surface of the outer peripheral portion of the rigid thick wall. The elastic piece is separated from the net member, and in a seated state, the peripheral portion of the net member is bent downward to press the elastic piece.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is directed to a seat (B) or a backrest (C) of a chair (A) as illustrated in FIG. 1. Hereinafter, referring to FIG. An embodiment applied to (1) will be described.
As shown in FIGS. 2 and 3, the seat sheet (B) is formed of a net member made of high-tensile plastic or other suitable material along the upper surface and the outer surface of the seat frame (1) having a desired closed shape. 2) After abutting the peripheral portion of the net member (including the perforated plate), the peripheral end of the net member (2) is folded inward, and a seat frame is provided on the lower surface of the folded portion (2a). A fastening frame (3) substantially similar in shape to (1) is superimposed, and a bolt (5) inserted from below a through hole (4) formed in each part of the fastening frame (3) is inserted into a seat frame ( By screwing into a screw hole (6) drilled at a corresponding location on the lower surface of (1), the inward folded portion (2a) of the net member (2) is fixed to the lower surface of the fastening frame (3). Is formed.
[0011]
The seat frame (1) is provided with an elastic piece (8) inclined downward inward from the upper surface of the thick rigid outer peripheral portion (7), and has a thick rigid outer peripheral portion (7). A downwardly extending ridge (9), an upward holding groove (10), and an upwardly sandwiching groove (11) are provided on the lower surface of the upper surface from the inside to the outside.
[0012]
The said screw hole (6) is perforated from the lower surface of the downward protrusion (9).
[0013]
It is preferable that the holding groove (10) and the holding groove (11) have a trapezoidal cross section that becomes slightly narrower upward.
[0014]
The fastening frame (3) has an outer peripheral portion (12) having a planar shape corresponding to the outer peripheral portion (7) of the seat frame (1), and the upper surface of the outer peripheral portion (12) has a seat frame (1). An upward protective flange (3a) that can be polymerized is provided on the outer portion of the seat frame, and a portion corresponding to the downward protruding ridge (9) and the holding groove (11) of the seat frame (1) is provided on each of them. An annular recessed hole (13) and an upright piece (14) that can be fitted are provided.
[0015]
The gap between the holding groove (11) and the upright piece (14) is determined so that the folded portion (2a) of the net member (2) can be inserted and fastened between them.
[0016]
The outer peripheral edge of the net member (2) is slightly narrower than the width of the holding groove (10) in the outer peripheral portion (7) of the seat frame (1), and has an outward locking piece (15) at the lower end. In addition, a sandwiching piece (16) that is continuous or divided in the circumferential direction is fixed.
[0017]
To stretch the net member (2), the peripheral portion thereof is brought into contact with the upper surface and the outer surface of the outer peripheral portion (7) of the seat frame (1), and then the outer end is bent inward. The holding piece (16) fixed to the outer peripheral edge is fitted from below the holding groove (10).
[0018]
As a result, the outer peripheral edge of the net member (2) is retained and retained in the holding groove (10), so that the fastening frame (3) abuts on the lower surface of the seat frame (1) and the bolt (5) Is inserted from below the through hole (4) and screwed into the screw hole (6) of the seat frame (1), the inserting piece (16) is pushed by the fastening frame (3), Enter into the support groove (11).
[0019]
Therefore, the peripheral portion of the net member (2) is pulled into the lower surface of the seat frame (1), and is automatically stretched with uniform tension in the circumferential direction and inward and outward directions.
[0020]
Furthermore, in the embodiment, at this time, the upstanding pieces (14) on the upper surface of the fastening frame (3) press the peripheral portion of the net member (2), and the holding grooves (14) of the seat frame (1) are formed. 11) Since it is pushed in, the tension of the net member (2) becomes larger.
[0021]
【The invention's effect】
The effects of the invention described in each claim are as follows.
Claim 1: When the clamping piece is attached to the lower surface of the seat frame after loosely inserting the sandwiching piece of the peripheral portion of the net member into the holding groove on the lower surface of the seat frame, the net member is automatically attached to the net member. , A constant tension is applied.
[0022]
Claim 2: When the fastening frame is attached to the lower surface of the seat frame, the sandwiching piece is suitably pushed by the fastening frame to enter the holding groove, and is sandwiched by using the horizontal locking piece. The net member together with the insert can be removed from the seat frame.
[0023]
Claim 3: Additional tension is automatically applied to the net member.
[0024]
Claim 4: The outer surfaces of the seat frame and the net member are protected.
[0025]
Claim 5: When not in use, the net member is in a horizontal state so that the appearance is good, and in use, the load of the occupant is suitably received by the net member and the elastic pieces.
[Brief description of the drawings]
FIG. 1 is a side view illustrating a chair provided with a seat structure of the present invention.
FIG. 2 is a lower perspective view showing an embodiment of the seat structure of the present invention.
FIG. 3 is an exploded lower perspective view of the same.
FIG. 4 is an enlarged vertical sectional view showing an outer end of the seat structure.
FIG. 5 is an enlarged longitudinal sectional view showing an outer end of the seat structure in an exploded manner.
[Explanation of symbols]
(A) Chair (B) Seat seat (C) Backrest (1) Seat frame (2) Net member (2a) Folded part (3) Tightening frame (3a) Upward protective flange (4) Through hole (5) Bolt (6) Screw hole (7) Outer peripheral portion (8) Elastic piece (9) Downward ridge (10) Holding groove (11) Holding groove (12) Outer peripheral portion (13) Concave hole (14) Standing piece (15) ) Locking piece (16) Inserting piece

Claims (5)

The insertion portion is stretched on the upper surface of the seat frame, and the peripheral portion is fastened to the peripheral portion of the net member which is turned inward through the upper surface and the outer surface of the outer peripheral portion of the seat frame. The insertion piece is fitted into a circumferential holding groove provided on the lower surface of the outer peripheral portion of the seat frame, and the holding piece is pushed into the holding groove with a fastening frame attached to the lower side of the seat frame. A tension structure is applied to the net member, thereby providing a seat structure for a chair. 2. A chair seat structure according to claim 1, wherein a lower end of the sandwiching piece is provided with a horizontal locking piece which receives the pressing force of the tightening frame and can function for removal. . On the outer side of the holding groove, a circumferential holding groove was provided on the lower surface of the outer peripheral portion of the seat frame, and a standing piece was provided at a corresponding position on the upper surface of the fastening frame, and the fastening frame was attached to the lower surface of the seat frame. The chair according to claim 1 or 2, wherein the upstanding piece presses a peripheral portion of the net member into the holding groove to apply further tension to the net member. Seat structure. The chair seat structure according to any one of claims 1 to 3, wherein an upward protection flange that can be superposed on an outer portion of the seat frame is formed on an outer peripheral edge of the fastening frame. The seat frame has an elastic piece that inclines downward from the upper surface of the outer peripheral portion of the rigid thick wall.In an unseat state, the elastic piece is separated from the net member, and in a seated state. The chair seat structure according to any one of claims 1 to 4, wherein a peripheral portion of the net member is bent downward to press the elastic piece.

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