JP4855593B2 - Chair shell structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair shell structure in which a synthetic resin shell in which a backrest and a seat are integrally formed is attached to a leg frame.
[0002]
[Prior art]
Conventionally, in the shell of the chair as described above, an opening is provided in the lower portion of the backrest portion to ensure air permeability to the design waist of the chair and appropriate bending of the backrest portion.
[0003]
[Problems to be solved by the invention]
However, in the configuration in which the opening is provided in the shell, the peripheral edge of the opening in the shell and the vicinity thereof are insufficient in strength, and the peripheral edge of the opening and the vicinity thereof may be cracked due to the influence of a repeated load acting on the backrest portion. .
[0004]
SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional technology, the present invention effectively reinforces the periphery of the opening of the shell and the vicinity thereof, and provides a shell structure of a chair excellent in strength. Yes.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) In a shell structure of a chair formed by integrally forming a backrest portion and a seat portion and having a synthetic resin shell having an opening at a lower portion of the backrest portion attached to a leg frame, the shell is formed on the periphery of the opening. of Rutotomoni provided a flange that protrudes on the back side, as along the upper and lower flanges in the flange, also protrudes on the back side of the shell, and flange and is separated by providing the protruding portions of the left and right directions.
[0006]
( 2 ) In the above item ( 1 ), the flange and the protrusion are connected with a plurality of ribs.
[0007]
( 3 ) In the above item ( 1 ) or ( 2 ), a groove in which the periphery of the cushion is fitted is provided on the surface side of the shell so as to correspond to the protrusion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 is an exploded perspective view of a chair provided with an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a plan view of the same, and FIG. Show.
[0009]
The chair (1) includes a leg frame (2) that forms a framework of the chair body, a side-view forward L-shaped synthetic resin shell (3) attached to the leg frame (2), and a shell (3). The seat cushion (4) and the backrest cushion (5) stretched on the surface of the seat.
[0010]
The leg frame (2) is installed horizontally in the left-right direction between a pair of left and right frame members (6), (6) forming the legs of the chair (1) and the frame members (6, 6). The front and rear connecting rods (7) and (8) are formed.
[0011]
The frame member (6) consists of front and rear legs (6a) and (6b) that are formed by bending a metal round pipe material into a substantially square shape when viewed from the side, and the upper ends of the front legs (6a). The upper collar part (6c) extending horizontally from the rear leg part (6b) to the front leg part (6a) and the rear leg part (6b) are connected at the lower end, and the lower collar part placed on the floor ( 6d).
[0012]
The rear end of the upper collar part (6c) is bent upward at the intersection with the rear leg part (6b) and overlaps with the rear leg part (6b) to form a connecting part (6e) extending upward. ing.
[0013]
As shown in FIG. 8, the front connecting rod (7) is formed by bending a metal plate material into a substantially rearwardly expanded V shape when viewed from the side, and a screw (9) A pair of left and right through holes (7a) into which (9) can be inserted are provided, and both end portions are joined to the corner portions of the front leg portion (6a) and the upper collar portion (6c) by welding.
[0014]
As shown in FIG. 7, the rear connecting rod (8) is formed by bending a metal plate, and the longitudinal section is formed at the upper ends of the flat upward U-shaped base (8a) at the front and rear ends. The front and rear flanges (8b) and (8b) are facing to each other, and both ends are joined to the rear portions of the upper flange portions (6c) and (6c) of the frame members (6) and (6) by welding. .
[0015]
The shell (3) is formed by injection molding a synthetic resin material, and the backrest (10) and the seat (11) are integrally formed.
[0016]
The backrest portion (10) has a cylindrical portion (10a) in the vertical direction at the lower portions on the left and right sides, open at the bottom, and capable of fitting the connecting portion (6e) of the frame member (6) from below. An opening (12) that is long in the left-right direction is provided at the center of the lower portion, and is connected to the rear end of the seat (11) with connecting portions (10b) on both sides of the opening (12).
[0017]
The opening (12) is provided in order to ensure the design viewpoint of the chair (1), the breathability to the waist of the seated person, the appropriate deflection of the backrest (10), etc. As shown mainly in FIG. 6, a flange (13) facing rearward for reinforcement is provided on the periphery.
[0018]
On the surface side of the backrest part (10), the outer peripheral edge of the backrest cushion (5) and the cloth (14) covering the backrest cushion (5) is fitted with the vertical and horizontal cores (15). (16) is provided along the upper edge, both side edges, and the upper side of the opening (12) of the backrest (10).
[0019]
Similarly, as shown in FIG. 6, a substantially forward U-shaped protrusion (17) that protrudes backward corresponding to the groove (16) is provided on the rear surface side.
[0020]
Between the upper flange (13) in the opening (12) and the ridge (17) provided along the flange (13), as shown mainly in FIG. It is connected by a plurality of ribs (18) facing in the vertical direction for reinforcement.
[0021]
The seat portion (11) is placed on the front and rear connecting rods (7) and (8), and on the rear surface thereof, a pair of left and right screw holes (11a) into which screws (9) are screwed, and the front A direction provided along the rear edge of the connecting rod (7) and the edge of the front and rear flanges (8b) of the rear connecting rod (8) and substantially perpendicular to the front and rear connecting rods (7) and (8). A plurality of plate-like ridges (19) and (21) facing the front and a pair of front and rear locking portions (20) that can be engaged with and disengaged from the front and rear flanges (8b) of the rear connecting rod (8). Yes.
[0022]
The pair of front and rear locking portions (20) face in the front-rear direction and can elastically deform in the front-rear direction in the vicinity of the edges of the front and rear flanges (8b) in the rear connecting rod (8) as shown in FIG. In this manner, the rear end side of the seat portion (11) is placed on the upper surface of the rear connecting rod (8), so that the opposite end portions are engaged with the lower surface side of the front and rear flanges (8b). Match.
[0023]
In the state where the seat portion (11) is placed on the upper surfaces of the front and rear connecting rods (7) and (8), the raised portion (19) projects downward from the plate thickness surface at the rear end of the front connecting rod (7). And along the rear edge of the front connecting rod (7) at a predetermined interval (S). Further, the raised portion (21) protrudes downward from the plate thickness surface at the edge of each flange (8b) in the rear connecting rod (8), and at the edge of each flange (8b) with a predetermined interval (S). Formed along.
[0024]
The interval (S) in the raised portions (19) and (21) is formed to be narrower than at least the width of the finger of the hand. This prevents fingers and nails from touching the end edges of the front and rear connecting rods (7) and (8). Further, the surface side of the seat portion (11) corresponding to the raised portions (19) and (21) is formed flat.
[0025]
On the surface of the seat (11), the outer periphery of the cushion for seat (4) and the inner shell (22) made of synthetic resin placed between the seat (11) and the cushion for seat (4) Are provided along the front edge, both side edges, and the lower side of the opening (12) of the seat (11). Similarly, as shown in FIG. 6, a protrusion (24) having a substantially U-shaped cross section is provided on the rear surface so as to protrude downward corresponding to the groove (23).
[0026]
In order to reinforce the flange (13), as shown in FIG. 6, between the lower flange (13) in the opening (12) and the protrusion (24) provided along the flange (13). Are connected by a plurality of ribs (25).
[0027]
When assembling the chair (1), the connecting part (6e) of the leg frame (2) is inserted into each cylindrical part (10a) of the backrest part (10) of the shell (3), and the entire shell (3) is inserted. Is pressed downward to place the back surface side of the seat (11) on the upper surfaces of the front and rear connecting rods (7) and (8). As a result, each locking portion (20) abuts against the front and rear flanges (8b) of the rear connecting rod (8) and is once expanded, and with its restoring force, it is applied to the lower surface of each flange (8b). Engage.
[0028]
Next, the screw (9) is inserted into the through hole (7a) of the front connecting rod (7) from below and screwed into the screw hole (11a) of the seat portion (11), so that the seat portion (11) is inserted. The front part is fastened to the front connecting rod (7).
[0029]
As described above, the shell (3) can be easily attached to the leg frame (2). Further, the seat (11) of the shell (3) is placed on the front and rear connecting rods (7) and (8) and is fixed by the respective locking portions (20) and screws (9), so that it is stable. In the state, it is attached to the leg frame (2).
[0030]
When the shell (3) is attached to the leg frame (2), the raised portions (19) and (21) of the seat portion (11) are connected to the front and rear connecting rods (7) and (8) at intervals (S). And protrudes from each edge. Therefore, when handling the chair (1) with the back side of the seat (11), fingers, nails, etc. of the hand do not come into contact with the edges of the connecting rods (7), (8). ) Can be handled safely.
[0031]
When disassembling the chair (1), the screws (9) were removed and the locking portions (20) were detached from the flanges (8b) of the rear connecting rod (8) against the elastic force. Thereafter, the shell (3) can be easily removed from the leg frame (2) by pulling out the cylindrical portion (10a) of the backrest (10) from the connecting portion (6e) of the leg frame (2).
[0032]
【The invention's effect】
According to the present invention, the following effects can be achieved.
(A) According to the first aspect of the present invention, the periphery of the opening of the shell can be effectively reinforced, and the shell can be prevented from being damaged.
[0033]
Further , the strength in the vicinity of the periphery of the opening in the shell can be increased, and damage to the shell can be prevented more effectively.
[0034]
( B ) According to the invention of claim 2 , it is possible to increase the strength in the vicinity of the flange, the ridge portion, and the periphery of the opening, and more effectively prevent the shell from being damaged.
[0035]
( C ) According to the invention described in claim 3, it is possible to reliably stretch the cushion on the surface side of the shell while ensuring the strength of the shell.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a chair provided with an embodiment of the present invention.
FIG. 2 is also a side view of the chair.
FIG. 3 is also a plan view of the chair.
FIG. 4 is a perspective view of the chair as seen from the rear and obliquely below.
5 is an enlarged view of a portion A in FIG. 4 similarly. FIG.
6 is a longitudinal sectional view taken along line VI-VI in FIG. 3 in the same manner.
7 is an enlarged longitudinal sectional view taken along line VII-VII in FIG.
8 is an enlarged longitudinal sectional view taken along line VIII-VIII in FIG.
[Explanation of symbols]
(1) Chair
(2) Leg frame
(3) Shell
(4) Seat cushion
(5) Back cushion
(6) Frame member
(6a) Front leg
(6b) Rear leg
(6c) Upper collar
(6d) Lower arm
(6e) Connecting part
(7) Previous connecting rod
(7a) Through hole
(8) Back connection
(8a) Base
(8b) Flange
(9) Screw
(10) Backrest
(10a) Cylindrical part
(10b) Connection part
(11) Seat
(11a) Screw hole
(12) Opening
(13) Flange
(14) Cloth
(15) Heartwood
(16) Groove
(17) Projections
(18) Rib
(19) Raised part
(20) Locking part
(21) Raised part
(22) Inner shell
(23) Groove
(24) Projections
(25) Rib

Claims (3)

In a shell structure of a chair formed by integrally forming a backrest portion and a seat portion and attaching a synthetic resin shell having an opening at a lower portion of the backrest portion to a leg frame,
The periphery of the opening, Rutotomoni provided a flange that protrudes on the back side of the shell, as along the upper and lower flanges in the flange, the left-right direction also is spaced projecting and flange and on the back side of the shell A shell structure of a chair provided with ridges . Shell structure according to claim 1, wherein the chair between and ligated with a plurality of ribs of the flange and protrusions. The shell structure of the chair according to claim 1 or 2, wherein a groove into which the peripheral edge of the cushion is fitted is provided on the surface side of the shell so as to correspond to the protruding portion.

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