JP4071564B2 - Chair seat structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat structure for 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 the conventional chair seat structure in which the elastically deformable net member is stretched on the seat frame, the periphery of the net member is superposed on the seat frame, and the seat is secured with a bolt or the like via the tightening holding member. Generally, it is fastened to a frame.
[0003]
[Problems to be solved by the invention]
It is not easy to fasten the periphery of the net member to the seat frame in the conventional manner described above while applying a constant tension, and it takes a lot of labor and time, and in the vicinity of each tightening bolt, etc. The tension of the net member becomes non-uniform, wrinkles or bends in the mounting part of the net member, and excessive tension acts on the net member around the tightening bolt etc. This part of the can break.
[0004]
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 problem is solved as follows.
(1) The sandwiching piece is fastened to the periphery of the net member which is stretched on the upper surface of the seat frame and the peripheral portion is turned inward through the upper surface and outer surface of the outer periphery of the seat frame. The sandwiching piece is inserted into a circumferential holding groove provided on the lower surface of the outer peripheral portion of the seat frame, and the clamping piece is fitted into the holding groove with a fastening frame attached to the lower side of the seat frame. By pushing it in, tension is applied to the net member.
[0006]
(2) In the above item (1), a horizontal locking piece is provided at the lower end of the sandwiching piece to receive and support the pressing force by the fastening frame and to function for removal.
[0007]
(3) In the above item (1) or (2), a circumferential holding groove is provided on the lower surface of the outer peripheral portion of the seat frame on the outer side of the holding groove, and an upright piece is provided at a corresponding position on the upper surface of the fastening frame When the fastening frame is attached to the lower surface of the seat frame, the standing piece pushes the peripheral part of the net member into the pinching groove, thereby applying further tension to the net member. .
[0008]
(4) In any one of the above items (1) to (3), an upward protective flange that can be superimposed on the outer side of the seat frame is formed on the 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 periphery of the rigid thick wall, The elastic piece is separated from the net member, and in the seated state, the periphery of the net member is bent downward to press the elastic piece.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is directed to a seat (B) or backrest (C) of a chair (A) as illustrated in FIG. 1. Hereinafter, referring to FIG. ) Will be described.
As shown in FIGS. 2 and 3, the seat sheet (B) is a net member made of high-strength plastic or other appropriate material along the upper surface and outer surface of the seat frame (1) having a desired closed shape. 2) After contacting the peripheral part (including the perforated plate), the peripheral end of the net member (2) is folded back inward, and the seat frame is placed on the lower surface of the folded part (2a). A bolt (5) inserted from below the through holes (4) drilled in various places of the fastening frame (3) is superposed on the fastening frame (3) which is almost similar to (1). 1) By screwing into a screw hole (6) drilled at a corresponding position on the lower surface of 1), the inward turning portion (2a) of the net member (2) is fastened 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 periphery (7), and the thick rigid outer periphery (7). On the lower surface, a downwardly extending ridge (9) in the circumferential direction, an upward holding groove (10), and an upward pinching groove (11) are provided from the inside to the outside.
[0012]
The screw hole (6) is formed from the lower surface of the downward protrusion (9).
[0013]
The holding groove (10) and the pinching groove (11) are preferably trapezoidal sections that become slightly narrower upward.
[0014]
The fastening frame (3) has a planar outer peripheral portion (12) corresponding to the outer peripheral portion (7) of the seat frame (1), and the seat frame (1) is formed on the upper surface of the outer peripheral portion (12). An upward protective flange (3a) that can be superposed on the outer side of the seat frame (1), and a portion corresponding to the downward protrusion (9) and the pinching groove (11) of the seat frame (1), respectively, An annular concave hole (13) and an upright piece (14) that can be fitted are provided.
[0015]
The gap between the sandwiching 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 part (7) of the seat frame (1), and has an outward locking piece (15) at the lower end. In addition, the sandwiching piece (16) which is continuous or divided in the circumferential direction is fixed.
[0017]
In order to stretch the net member (2), its peripheral portion is brought into contact with the upper surface and outer surface of the outer peripheral portion (7) of the seat frame (1), and then the outer end thereof is bent inward. The inserting piece (16) fixed to the outer peripheral edge is inserted from below the holding groove (10).
[0018]
As a result, the outer peripheral edge of the net member (2) is held in the holding groove (10) so that the fastening frame (3) comes into contact with 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 tightening frame (3), Enter the branch 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 a uniform tension in the circumferential direction and the inner and outer directions.
[0020]
Furthermore, in the embodiment, at this time, the standing piece (14) on the upper surface of the fastening frame (3) presses the peripheral portion of the net member (2), and the support groove ( 11) Since it pushes in, the tension | tensile_strength of a net member (2) becomes larger.
[0021]
【The invention's effect】
The effects of the invention described in each claim are as follows.
Claim 1: After inserting the clamping piece at the peripheral edge of the net member loosely into the holding groove on the lower surface of the seat frame and attaching the tightening frame to the lower surface of the seat frame, the net member is automatically A constant tension is applied.
[0022]
Claim 2: When the clamping frame is attached to the lower surface of the seat frame, the clamping piece is suitably pushed by the clamping frame and enters the holding groove, and the clamping piece is clamped using the horizontal locking piece. The net member can be removed from the seat frame together with the insertion piece.
[0023]
Claim 3: Further tension is automatically applied to the net member.
[0024]
Claim 4: The outer surface of the seat frame and the net member is protected.
[0025]
Claim 5: When not in use, the net member is in a horizontal state, so that the appearance is good, and at the time of use, the load of the seated person is suitably received by the net member and the elastic piece.
[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 bottom perspective view of the same.
FIG. 4 is an enlarged longitudinal sectional view showing an outer end portion of a seat structure.
FIG. 5 is an enlarged longitudinal sectional view showing the outer end of the seat structure in an exploded manner.
[Explanation of symbols]
(A) Chair
(B) Seat seat
(C) Back support
(1) Seat frame
(2) Net members
(2a) Folding part
(3) Tightening frame
(3a) Upward protective flange
(4) Through hole
(5) Bolt
(6) Screw hole
(7) Outer periphery
(8) Elastic piece
(9) Downward protrusion
(10) Holding groove
(11) Clamping groove
(12) Outer periphery
(13) Recessed hole
(14) Standing piece
(15) Locking piece
(16) Insertion piece

Claims (5)

The sandwiching piece is fastened to the periphery of the net member which is stretched on the upper surface of the seat frame and the peripheral portion passes through the upper surface and the outer surface of the outer periphery of the seat frame and is turned inward. The insertion piece is inserted into a circumferential holding groove provided on the lower surface of the outer peripheral portion of the seat frame, and the clamping piece is pushed into the holding groove with a fastening frame attached to the lower side of the seat frame. Thus, the seat structure of the chair is characterized in that tension is applied to the net member. 2. A seat structure for a chair according to claim 1, wherein a horizontal locking piece is provided at the lower end of the sandwiching piece so as to receive and support the pressing force by the fastening frame and to function for removal. . On the outer side of the holding groove, a circumferential support groove is provided on the lower surface of the outer periphery of the seat frame, and standing pieces are provided at corresponding locations on the upper surface of the fastening frame, and the fastening frame is attached to the lower surface of the seat frame. 3. The chair according to claim 1, wherein the standing piece applies a further tension to the net member by pushing a peripheral part of the net member into the pinching groove. Seat structure. The chair seat structure according to any one of claims 1 to 3, wherein an upward protective 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 inclined downward inward from the upper surface of the outer periphery of the rigid thick wall, and when not seated, the elastic piece is separated from the net member, and in the seated state The seat structure of the chair 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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