JP2006271622A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a chair durable against a large backward load by increasing the supporting strength of a backrest separate from a seat of the chair. <P>SOLUTION: Erected rods 11b of a pair of left and right backrest support frames 11 are attached to both side faces of the lower part of the backrest 3, and the upper ends of the erected rods 11b are connected to the rear ends of respective armrest parts facing rearward, which are connected to the upper ends of front legs 2a facing in the vertical direction of a pair of left and right front leg frames 2. The front ends of forward rods 11a connected to the lower ends of the erected rods 11b of the left and right backrest support frames 11 are connected to the rear ends of a pair of seat support rods 8 extending backward from a horizontal frame 5 connected to the left and right front legs 2a under the armrest parts 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chair in which the upper end of a pair of left and right leg frames is an armrest portion, and the backrest is supported by the rear ends of both armrest portions and the lower leg frame.

Conventionally, a chair in which the left and right sides of the backrest are attached to the rear portions of the left and right leg frames with upper and lower two bolts is known (for example, see Patent Document 1).
JP 2003-135200 A

  In the chair described in the above-mentioned patent document, the portion to which the backrest is attached is only slightly extended downward from the rear end of the armrest portion of the leg frame. The distance between the bolts must be narrow, and there is no part to support the backrest above the upper bolt, and the strength cannot be maintained when the height of the backrest is high, so use a high backrest There is a problem that can not be.

  When using a backrest with a high height, the backrest is usually formed integrally with the seat to increase the support strength of the backrest. However, in such a chair, since the seat and the backrest are continuous, there is a problem that it is difficult to adopt various designs in which the backrest is separated from the seat.

  The present invention has been made in view of the above problems, and by designing a structure in which the seat and the backrest are separated by increasing the support strength of the backrest and allowing it to withstand a large backward load. An object of the present invention is to provide a chair that can be mounted with a high backrest.

According to the present invention, the above problem is solved as follows.
(1) At the lower side of the backrest, mount the standing rods in the left and right pair of backrest support frames and connect the upper ends of both standing rods to the upper ends of the front legs facing the vertical direction in the pair of left and right leg frames. The front end of the forward saddle connected to the lower end of the upright saddle of the left and right back support frame is rearward of the left and right front legs below the armrest. And a pair of seat support rods extending to the rear end of the pair.

(2) In the above item (1), projecting shafts are projected forward at the upper end of the standing rod and the front end of the forward facing rod, and these projecting shafts are arranged behind the armrest portion and the seat support rod formed by the pipe material. Fit into the end opening and join.

(3) In the above item (1) or (2), a projecting portion and a recessed groove which are fitted to each other are provided on a surface opposite to the standing heel and a backrest side surface to which the standing heel is attached.

(4) In any of the above items (1) to (3), the front legs of the left and right leg frames are connected to each other by a horizontal frame, and the front ends of a pair of left and right seat support rods are fixed to the horizontal frame. .

(5) In any one of the above items (1) to (4), the seat support rod and the forward-facing rod of the backrest support frame are made substantially horizontal, and they are aligned and coupled to each other.

According to the first aspect of the present invention, the upright saddle of the backrest support frame is attached to both side surfaces of the backrest, and the upper end of the upright saddle is attached to the rear end of the armrest portion and the forward side of the lower end of the upright saddle. By connecting the front end to the rear end of the seat support rod that extends rearward from the front leg of the leg frame, the backrest is substantially supported by the left and right leg frames at two locations that are largely spaced apart from each other. The Rukoto.
Therefore, the backrest is supported with high strength against a large backward load applied to the backrest, and it is possible to attach a high backrest separated from the seat, and it is possible to provide chairs with various designs. .

  According to the invention of claim 2, by fitting the protruding shafts of the standing rod and the forward-facing rod into the opening at the rear end of the armrest portion and the seat support rod, it becomes easy to position and attach each other. In addition, it can be easily connected by screws or the like.

  According to the third aspect of the present invention, the standing rod can be easily positioned and attached to the side surface of the backrest, and the attachment portions of each other do not shift to the front and rear and the upper and lower surfaces.

According to the fourth aspect of the present invention, the left and right leg frames are connected by the horizontal frame, so that the seat support rod fixed to the horizontal frame is stably supported by the leg frame having a left-right integrated structure. As a result, the support strength of the lower part of the backrest that is coupled to both the support heels via the backrest support frame is also increased.
Further, since the left and right seat support rods approach each other inward, the central portion of the seat supported thereby is less likely to bend downward when seated.

  According to the invention of claim 5, when a backward load is applied to the backrest, a forward rotational moment centered on the upper coupling portion is applied to the forward and back support frames of the back support frame. Since it acts as a forward pressing force and acts linearly, the tension force increases, so the lower end of the backrest does not bend forward and it has high strength against the backward load applied to the backrest .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front view of the chair of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is an exploded perspective view of the same.

  The chair (1) includes a pair of left and right leg frames (2) and (2), and a backrest (3) and a seat (4) mounted across the leg frames (2) and (2). .

  Each leg frame (2) is a steel pipe bent in a backward U shape when viewed from the side. Both leg frames (2) and (2) are made up of their front legs (2a) facing in the vertical direction. A horizontal frame (5) (5) whose end is fixed to a surface slightly above the center, that is, an intermediate portion below the seat (4) and the rear end of the base leg (2b), Are connected to each other.

  The upper ends of the left and right leg frames (2) are bent rearward to form armrests (6) and (6) located above the seat (4), and are formed on the upper surface of each armrest (6). The elbow pad (7) is attached so as to cover the upper end of the front leg (2a).

  The front ends of seat support rods (8) and (8) consisting of a pair of left and right steel pipes facing the rear, which are shorter than the armrests (6), are joined to the rear surfaces of both side ends of the horizontal frame (5) by welding. Has been.

  The backrest (3) has a substantially square shape when viewed from the front, with the lower left and right dimensions gradually decreasing downward, and a synthetic resin with a square shape when viewed from the side with a flexure hole (3a) provided in the center. A mesh-like backing material (10) made of a synthetic fiber having stretchability or flexibility is stretched on a back frame (9) made of, for example.

  The lower part of both sides of the back frame (9) is attached to the rear end of the armrest (6) and seat support collar (8) by a pair of left and right back support frames (11) and (11) as follows. Installed.

  The backrest support frame (11) has a front heel (11a) extending substantially horizontally toward the rear end of the seat support ridge (8) and a side surface of the lower portion of the seat frame (3) from the rear end. It is composed of a standing ridge (11b) extending obliquely forward and upward, and is integrally formed of an aluminum alloy or the like.

  As shown in FIG. 4, the opposing surfaces of the left and right upright saddles (11a) are inclined surfaces that expand upward so that they can come into contact with the inclined surfaces on the lower sides of the back frame (9). Yes.

As shown in FIGS. 4 and 5, a ridge (12) that faces obliquely in the up-down direction is provided at the middle portion of the inner surface of the upright rod (11 b) in the up-down direction. By fitting this ridge (12) into a concave groove (13) that is formed in the lower part of both side surfaces of the back frame (9) and faces in the vertical direction, positioning when the backrest support frame (11) is mounted is performed. can do.
Contrary to the above, the protrusion (12) may be provided on the back frame (9) side, and the concave groove (13) may be provided on the standing ridge (11b) side.

  On the inner surface of the standing rod (11b), two bottomed female screw holes (14) and (14) facing the left and right direction are formed through the ridge (12).

  As shown in FIGS. 3, 4, 6 and 8, the front end of the forward saddle (11a) of the backrest support frame (11) and the front surface of the upper end of the standing saddle (11b) face forward, respectively. Protrusions (15a) and (15b) that can be fitted into the rear end opening of the support rod (8) and the rear end opening of the armrest (6) are integrally provided.

  A lower threaded shaft (15a) is provided with a female screw hole (16) facing upwards and downwards, and an upper projecting shaft (15b) is provided with a stepped hole (17) facing axially in the rear. More drilled.

In order to attach the backrest (3) to the leg frame (2), first, the backrest support frame (11) is attached to the lower portions of both side surfaces of the back frame (9) as follows.
First, after fitting the ridges (12) on the inner side surface of the upright rod (11b) of the backrest support frame (11) into the concave grooves (13) formed in the lower portions on both sides of the back frame (9), Bolts (19) are inserted from the inside into two upper and lower step holes (18) and (18) drilled in the lower part of both sides of the back frame (9), and the tip of the back frame is supported on the back support frame (11) Are screwed into the female screw holes (14) and (14), and are tightened (see FIGS. 4 and 5).

  Next, the upper and lower projecting shafts (15a) and (15b) of the back support frame (11) are fitted into the rear end openings of the armrest (6) and the seat support rod (8), respectively, and the upper projecting shaft ( For 15b), the connecting bolt (20) inserted from the rear into the stepped hole (17) is screwed into the screw cylinder (21) which is fixed to the armrest (6) by welding or the like in advance. Fix by tightening (see FIG. 6).

  The lower protruding shaft (15a) is fixed by inserting it into the female screw hole (16) from below the seat support rod (8) and screwing the countersunk bolt (22) (see FIG. 8).

  After fixing the lower projecting shaft (15a), the seat support rod (8) and the forward facing rod (11a) of the backrest support frame (11) are connected to each other in a substantially horizontal and straight line.

  The opening surface at the rear end of the stepped hole (17) provided in the upper protruding shaft (15b) is closed by a cap (23). The forward-facing ridge (11a) of the backrest support frame (11) also functions as a seat support section after being coupled to the seat support ridge (8).

  The seat (4) has a square-shaped bending hole (4a) at the center, and is formed on the upper surface of a synthetic resin seat frame (24) having a substantially square shape in plan view with both sides inclined obliquely upward and downward. As with the backrest (3), a mesh-like upholstery material (25) made of stretchable or flexible synthetic fiber or the like is stretched, and when the seated person sits down, the upholstery material (25) A comfortable seating feeling can be obtained by the central portion sinking below the bending hole (4a) along the collar portion.

  The seat (4) is composed of left and right seat support rods (8) and (8) and forward facing rods (11a) of the left and right back support frames (11) that function as part of the seat support rod as follows. Mounted on.

  As shown in FIGS. 3 and 7, the lower end of the spacer (26) having a U-shaped cross section facing downward is fixed to the upper surface of the front end portion of each seat support rod (8) by welding.

  Also, a spacer (27) slightly smaller than the spacer (26) is integrally formed on the upper surface of the front end portion of the forward flange (11a). A clearance groove (28) into which the head of a screw (32) for attaching the rear portion of the receiving plate (30) described later is recessed is formed on the upper surface of the rear half of the spacer (27).

  In a substantially horizontal receiving groove (29) having an upward concave cross section formed on the lower surface of both sides of the seat frame (24) in the front-rear direction, a metal reinforcing receiving plate (30) facing the front-rear direction is provided. The two screws (32) inserted from below into the through holes (31) at both front and rear ends thereof are fixed by screwing into the female screw holes (not shown) on the back surface of the receiving groove (29). Yes.

  (33) is a cover member made of synthetic resin facing the front and rear spacers (26) and (27) and facing in the front-rear direction. The front and rear ends are closed with a lateral width that can accommodate both spacers (26) and (27). The lower end is configured to have a U-shaped cross section with a downward opening, and the lower end can come into contact with the upper surface of the seat support rod (8) and the forward facing rod (11a).

  The front and rear end portions facing the front and rear spacers (26) and (27) on the upper surface of the cover member (33) are such that the upper surfaces of the spacers (26) and (27) protrude upward, and the support plate (30) While being able to directly contact the lower surface, the head of the screw (32) for fixing the receiving plate (30) is opened so as to enter (see FIGS. 3 and 7).

  To attach the seat (4) to the seat support rod (8) and the forward facing rod (11a) of the back support frame (11), first place the cover member (33) on the front and rear spacers (26) and (27). The lower end is brought into contact with the upper surfaces of the seat support rod (8) and the forward facing rod (11a).

  Next, as shown in FIG. 7, the front spacer (26) is inserted into the spacer (26) through a through hole (34) penetrating vertically in the seat support rod (8). Insert the bolt (35) inserted into the through hole (36) on the upper surface of the spacer (26) and the through hole (37) of the receiving plate (30), and the receiving plate corresponding to this through hole (37) Screw onto the welding nut (38) that has been secured to the upper surface of (30).

Thus, the front spacer (26) is fixed to the lower surface of the front end portion of the receiving plate (30), that is, the lower surface of the front end portion of the seat frame (24) so as to sandwich the cover member (33). Yes.
An escape hole (39) into which the welding nut (38) enters is formed in the receiving groove (29) of the seat frame (24).

  The rear spacer (27) has an upper end portion of a long countersunk bolt (41) inserted from below into a through hole (40) penetrating it and the forward facing flange (11a) up and down. The rear end of the backing plate (30) is inserted into the rear end and screwed to the weld nut (38) fixed to the upper surface thereof so as to sandwich the cover member (33), That is, it is fixed to the lower surface of the rear end of the seat frame (24) (see FIG. 3).

  The rear welding nut (38) is also fitted into a clearance hole (not shown) formed in the receiving groove (29) so as not to interfere with the lower surface of the seat frame (24).

  As described above, in the chair (1) of the above-described embodiment, the lower part of the backrest (3) is attached to the legs via the pair of backrest support frames (11) and (11) fixed to both side surfaces. The front legs of the left and right leg frames (2) below the seat (4) and the rear end of the armrest (6), which are integrally formed at the upper end of the frame (2), are positioned above the seat (4). 2a) The backrest (3) is large in the vertical direction because it is connected to the rear end of the seat support rods (5) and (5) that are provided on the horizontal frame (5) that connects the middle parts of 2a). It is substantially supported by the left and right leg frames (2) at two spaced apart locations.

  Accordingly, the support strength against the backward load acting on the backrest (3) is increased, and it is possible to attach the backrest (3) having a high height separated from the seat (4).

  In addition, the forward saddle (11a) of the backrest frame (11) is substantially horizontal toward the front, and its front end is aligned and joined to the rear end of the substantially horizontal seat support rod (8). Therefore, when a backward load is applied to the backrest (3), a forward rotational moment about the joint at the upper end of the standing rod (11b) causes the forward rod (11a) and the seat support rod ( In 8), it acts as a forward pressing force and acts linearly, increasing the thrust force and increasing the strength against the backward load applied to the backrest (3).

  The lower surfaces of both sides of the seat frame (24) in the seat (4) are spacers provided on the upper surfaces of the left and right seat support rods (8) and the forward facing rods (11a) of the left and right backrest support frames (11) ( 26) Since it is supported by (27) and the lower surface of the seat frame (24) and the seat support rod (8) are separated from each other, the seat frame (24) itself, in particular, the front end portion is slightly bent downward when seated. In addition, when the mesh-like upholstery material (25) stretched on the upper surface of the seat frame (24) bends downward when seated, the seated person's buttocks pass through the flexure hole (4a) of the seat frame (24). It does not hit the left and right seat support rods (8), and a comfortable sitting comfort is obtained.

  The gap formed between the front and rear spacers (26) and (27) and the backing plate (30) and between the seat frame (24) and the seat support rod (8) is covered by the cover member (33). Therefore, it looks good from the side, and it becomes a chair with excellent design. In addition, since the upper end portion of the cover member (33) is accommodated in the receiving groove (29) on the lower surface of the seat frame (24) and is not visible from the outside, the appearance of the cover member (33) itself is improved.

  Since the cover member (33) is sandwiched and fixed between the lower surface of the seat frame (24), that is, the lower surface of the receiving plate (30) fixed to the lower surface thereof, and the upper surface of the seat support rod (8), No screws or screw holes for attaching the member (33) are required, and attachment / detachment is extremely easy.

  A metal backing plate (30) is installed in the receiving groove (29) on both sides of the seat frame (24), and this lower surface is brought into contact with the upper surface of the spacer (26) (27) to receive and support the load. Therefore, there is no fear that the lower surface of the synthetic resin seat frame (24) is worn and dented. Further, since the backing plate (30) is fixed to the seat frame (24) by screws (32), it is not necessary to provide the backing plate (30) integrally with the seat frame (24) by molding or the like. , Separation and disposal of them becomes easy.

  In the above embodiment, the rear spacer (27) is provided on the upper surface of the forward saddle (11a) of the backrest support frame (11), but the forward dimension of the forward saddle (11a) is made small, instead. In addition, if the longitudinal dimension of the seat support rod (8) is increased, it can be provided at the rear end of the seat support rod (8).

  The left and right seat support rods (8) may be directly attached to the rear surfaces of the front legs (2a) of the left and right leg frames (2) at a position substantially equal to the front horizontal frame (5).

It is a front view which shows one Embodiment of the chair of this invention. It is a side view similarly. It is an exploded perspective view similarly. It is the IV-IV line expansion vertical front view of FIG. FIG. 5 is an enlarged cross-sectional plan view taken along line VV in FIG. 4. Similarly, it is the VI-VI line vertical side view of FIG. It is the VII-VII line enlarged vertical front view of FIG. It is a VIII-VIII line expansion longitudinal front view similarly.

Explanation of symbols

(1) Chair
(2) Leg frame
(2a) Front leg
(2b) Base leg
(3) Backrest
(3a) Deflection hole
(4) Seat
(4a) Deflection hole
(5) Horizontal frame
(6) Armrest
(7) Elbow pad
(8) Seat support rod
(9) Back frame
(10) Backing material
(11) Back support frame
(11a) forward facing
(11b) Standing cage
(12) Projection (projection)
(13) Groove
(14) Female thread hole
(15a) (15b) Projection shaft
(16) Female thread hole
(17) Stepped hole
(18) Step hole
(19) Bolt
(20) Connecting bolt
(21) Female thread cylinder
(22) Flat head bolt
(23) Cap
(24) Seat frame
(25) Upholstery material
(26) (27)
(28) Escape groove
(29) Receiving groove
(30) Back plate
(31) Through hole
(32) Screw
(33) Cover member
(34) Through hole
(35) Bolt
(36) (37) Through hole
(38) Weld nut
(39) Escape hole
(40) Through hole
(41) Flat head bolt

Claims (5)

  Standing rods in a pair of left and right backrest support frames are attached to both lower side surfaces of the backrest, and the upper ends of both standing rods are connected to the upper ends of the front legs facing the vertical direction in the pair of left and right leg frames. The front end of the forward saddle connected to the lower end of the upright saddle of the left and right back support frame is extended rearward from the left and right front legs below the armrest. A chair characterized by being coupled to the rear ends of a pair of seat support rods.   Protruding shafts project forward from the upper end of the standing rod and the front end of the forward facing rod, and both projecting shafts are fitted into the opening at the rear end of the armrest and seat support rod formed by the pipe. The chair according to claim 1.   The chair according to claim 1 or 2, wherein a projecting portion and a recessed groove which are fitted to each other are provided on a surface facing the standing heel and a side surface of the backrest to which the standing heel is attached.   The chair according to any one of claims 1 to 3, wherein the front legs of the left and right leg frames are connected to each other by a horizontal frame, and the front ends of a pair of left and right seat support rods are fixed to the horizontal frame. The chair according to any one of claims 1 to 4, wherein the seat support ridge and the forward-facing heel of the back support frame are substantially horizontal and are aligned with each other and coupled to each other.

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