JP4427178B2 - Backboard mounting structure for chairs - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for attaching a back plate to the upper ends of a pair of left and right dorsal fins extending from the lower side to the rear upper side of a seat.
[0002]
[Prior art]
As a conventional mounting structure of this type, a pair of left and right dorsal fins formed by metal pipes are generally brought into contact with the rear surface or both side surfaces of the back plate and screwed.
[0003]
[Problems to be solved by the invention]
According to the conventional back plate mounting structure as described above, the downward load applied to the back plate is directly applied to the screws or the like as the fixing means, so that the durability of the fixing means is poor, and the upper end of the back ridge is attached to the cap or the like. If it is not covered by the cover, the body feels bad, and the back plate is supported only by the fixing means.
[0004]
In view of the above-described problems of the conventional technology, the present invention can attach a back plate firmly, in good shape and easily to the upper ends of left and right dorsal fins, and has a high durability. It is an object of the present invention to provide a back plate mounting structure.
[0005]
In addition, the present invention has been made in connection with forming a back plate by integrally molding a flexible back support portion and a highly rigid side frame portion supporting both sides thereof with a synthetic resin material. Therefore, an object of the present invention is to provide an optimal mounting structure for such a back plate to the back saddle.
[0006]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) On the upper part of a pair of left and right dorsal fins extending from the lower side of the seat to the rear upper side, there are provided ridges facing in the vertical direction with the front face open, and the upper and lower sides formed on both sides of the back plate in the ridges. A rearward protrusion formed on the lower rear surface of the side frame portion facing the direction is fitted, and the upper portion of the dorsal fin and the lower portion of the side frame portion are fixed to each other, and the upper portion of the side frame portion is A shape that is substantially the same shape as the dorsal fin from the upper end and continues upward is used.
[0007]
(2) In the above item (1), the upper part of the dorsal fin and the lower part of the side frame part are fixed to each other with a set screw.
[0008]
(3) In the above item (1) or (2), the cross-sectional shape of the upper part of the side frame part and the upper part of the dorsal fin is V-shaped or semicircular arc shape that opens forward, or an intermediate shape thereof. To do.
[0009]
(4) In any one of the above items (1) to (3), a plurality of rearwardly projecting portions projecting on the lower rear surface of the side frame portion and facing the substantially vertical direction with the center one having the highest dimension. It is formed by ribs.
[0010]
(5) In any one of the above items (1) to (4), a step portion is formed between the upper portion and the lower portion of the side frame portion, and the upper end of the dorsal fin is brought into contact with the step portion.
[0011]
(6) In any one of the above items (1) to (5), the back plate is formed with slits facing in the vertical direction in the vicinity of both sides. It is integrally formed of a synthetic resin material so as to be separated from the flexible back receiving portion.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, a caster (2) is provided at the tip of the support leg (1) extending radially from the center, and a pedestal (3) is provided at the center of the support leg (1). ) And a support base (4) is fixed to the upper end of the pedestal (3).
[0013]
The support base (4) is L-shaped in a side view and extends rearward and upward, and the lower front ends of a pair of left and right dorsal fins (6) that support the back plate (5) are shafts pointing in the left-right direction ( 7), and the back plate (5) and the dorsal fin (6) are moved from the standing position shown in FIG. 1 to the rear by an elastic reclining mechanism (not shown) provided in the support base (4). It can be tilted at an angle.
[0014]
Above the support base (4), the seat (8) moves rearwardly and downwardly through the seat support (9) in conjunction with the backward tilt of the back plate (5) and the backrest (6). It is supported in this way.
[0015]
On both sides of the seat receiver (9), armrests (10) are provided via supports (9a) extending in the left-right direction.
[0016]
As shown in FIG. 2 and subsequent figures, the back plate (5) is integrally formed of a synthetic resin material, and the front shape is substantially a vertical rectangle, and the upper and lower slits (11), (11a) facing the vertical direction in the vicinity of both sides. By cutting, the portion outside the slit (11) (11a) is a highly rigid side frame (12) that does not easily deform, and the portion inside the slit (11) (11a), It is a low-rigid back receiving part (13) having flexibility. The upper and lower ends of the upper slit (11) are closed, the upper end of the lower slit (11a) is closed, and the lower end is opened at the lower end of the back plate (5).
[0017]
The upper part (12a) of the side frame part (12) from substantially the center has a substantially V-shaped or semicircular arc shape with an opening on the front surface, or an intermediate shape thereof. As a matter of fact, the rigidity is increased.
[0018]
A plurality of (three strips in the illustrated example) facing the vertical direction with the front surface having a flat plate shape and the rear surface having a height at the center in the lower part (12b) from the substantially center part of the side frame part (12). By projecting the rib (14), a rearward projecting portion (15) projecting in a mountain shape toward the rear is formed.
[0019]
Two bosses (16) projecting rearward are formed at two locations above and below the lower surface (12b). The center of the boss (16) penetrates from the rear end to the front of the back (12). A screw insertion hole (17) is formed.
[0020]
The left and right dorsal fins (6) are made of an aluminum light alloy or other metal material, and the upper cross-sectional shape of the upper cross-sectional shape is formed by forming a vertically extending groove (6a) opening forward on the front surface of the upper part. The front surface is generally V-shaped or semicircular, or an intermediate shape thereof.
[0021]
The rearward projecting portion (15) in the lower portion (12b) of the side frame portion (12) is fitted into the concave strip (6a), and the upper end of the dorsal fin (6) is connected to the upper portion (12a in the side frame portion (12). ) And the lower part (12b) are in contact with the stepped part (12c) and the set screw (18) (see FIG. 7) inserted from the front into each screw insertion hole (17) is connected to the boss in the dorsal fin (6). The lower part (12b) of the side frame part (12) becomes the upper part of the dorsal fin (6) by screwing into the screw hole (20) in the center of the boss part (19) provided in the part corresponding to (16) It is tightly coupled to.
[0022]
A low step portion (21) is formed from the rear surface to the outer surface of the upper portion of the dorsal fin (6), and the outer surface shape is substantially the same as a part of the upper portion (12a) of the side frame portion (12). Fit a cover (22) made of a synthetic resin or rubber material that has a shape and has the same thickness as the depth of the lower step (21), and protrudes into the front of the cover (22). An engaging projection (24) having a locking claw (23) that is provided and elastically deformable at the distal end is fitted into an engaging hole (25) drilled in the rear surface of the dorsal fin (6). Thus, the cover (22) is fixed to the backpack (6).
[0023]
By attaching the cover (22) to the dorsal fin (6), the rear end of the screw hole (20) drilled in the dorsal fin (6) is covered, the appearance is improved, and the dorsal fin made of metal (6) is protected and can prevent the backpack (6) from colliding with a desk or cabinet and damaging them.
[0024]
Thus, the side frame portion (12) of the back plate (5) forms a part or extension of the original back ridge (6) and serves as a frame that firmly supports both sides of the back plate (5). ing.
[0025]
As shown in FIG. 1, the side frame part (12), the backrest (6) and the cover (22) of the back plate (5) are integrated with each other to form a gentle S-shape as a whole. It has a sophisticated appearance.
[0026]
In the back plate (5), the thickness of the back support portion (13) in the front-rear direction is smaller than the thickness of the side frame portion (12) in the front-rear direction, thereby making the back support portion (13) flexible. I have it.
[0027]
A bent portion (27) is formed in the middle portion in the vertical direction of the back support portion (13) by cutting away the remaining three flexible pieces (26) at the center and the left and right.
[0028]
Due to the presence of the bent portion (27), the back support portion (13) is divided into an upper portion (13a) and a lower portion (13b), and particularly when the seated person drowns strongly in the back support portion (13). When (5) is tilted backward, the bent part (27) moves rearward from the other part, and the upper part (13a) and the lower part (13b) are bent in a square shape when viewed from the side. . Thereby, even if the back plate (5) is tilted backward, the seated person's head is not tilted backward, and is kept substantially vertical, so that the eyes can always be kept facing forward in an easy posture.
[0029]
Each of the flexible pieces (26) has a mountain shape or a U shape with the top portion facing forward when viewed from the side. Accordingly, the upper portion (13a) and the lower portion (13b) are easily bent with respect to each other about the top portion of the flexible piece (26). That is, when the flexible piece (26) is disposed so that the top portion thereof faces rearward, the flexible piece (26) can be closed when the back support portion (13) is bent as described above, and the top portion is vertically moved. Directional tensile force acts and the upper and lower portions (13a) and (13b) are difficult to bend.However, according to this embodiment, the flexible piece (26) is open and the upper and lower portions (13a) and (13b) Becomes easy to bend.
[0030]
In the upper part (13a) and the lower part (13b) of the back support part (13), a number of hollow holes (28) (or a thin part) having a horizontally long hexagonal shape or any other shape are formed, By making the whole into a mesh shape, the flexibility of the upper part (13a) and the lower part (13b) is further enhanced.
[0031]
A bent piece (29) extending rearward is provided on the upper edge of the back plate (5). The bent piece (29) enhances the rigidity of the upper end of the back plate (5), and the bent piece (29) functions as an upper frame and is used to lock an upper edge of a cushion body (30) described later. It can also function as a projecting piece and as a handle when moving the chair.
[0032]
The lower end portion of the lower portion (13b) of the back support portion (13) is completely separated from the frame portion (12) by the left and right slits (11a), extends forward and downward, and is connected to the rear end of the seat (8). ing.
[0033]
The cushion body (30) has a shape that substantially covers the entire front surface of the back plate (5), and a winding portion (30a) that winds the rear end of the bent piece (29) of the back plate (5) is formed at the upper end thereof. Is formed.
[0034]
【The invention's effect】
According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, the rearward projecting portion of the lower portion of the side frame portion is fitted into the concave groove on the upper portion of the dorsal fin so that the side frame portion is firmly coupled to the dorsal fin and the side frame portion. Since the upper part of the upper part of the back has the same shape as the upper end and extends upward, the side frame part serves as a part or extension of the back and can strongly support the entire back plate.
[0035]
According to the invention described in claim 2, the upper part of the dorsal fin and the lower part of the side frame part can be firmly coupled with a simple structure.
[0036]
According to invention of Claim 3, the intensity | strength of the upper part of a side frame part and the upper part of a dorsal fin can be improved.
[0037]
According to the invention described in claim 4, it is possible to form the high-strength backward projection with a small amount of material.
[0038]
According to the fifth aspect of the present invention, the downward load applied to the back plate can be received at the upper end of the back plate through the stepped portion, so that the bending moment is not easily applied to the back plate, and the back plate and the back plate Stress can be prevented from concentrating on a fixing means such as a set screw with the side frame portion, and the back plate and the backrest can be positioned during the fixing operation.
[0039]
According to the invention described in claim 6, the backrest frame and the backrest, which have conventionally been individually formed of different materials, can be integrally formed as a backboard of a synthetic resin material, thereby shortening the manufacturing process. In addition, the manufacturing cost can be reduced.
Can do.
[Brief description of the drawings]
FIG. 1 is a side view of a chair provided with an embodiment of the present invention.
FIG. 2 is also a rear view.
FIG. 3 is a front perspective view of the back plate.
FIG. 4 is also a rear view of the left half of the back plate.
FIG. 5 is a side view of the back plate in the same manner.
FIG. 6 is an exploded perspective view of the back and the cover, similarly.
7 is an exploded plan view taken along the line VII-VII in FIG.
8 is a cross-sectional exploded plan view taken along line VIII-VIII in FIG.
[Explanation of symbols]
(1) Support legs
(2) Casters
(3) pedestal
(4) Support base
(5) Backboard
(6) Backpack
(6a) Concave
(7) Axis
(8) Seat
(9) Seat receiver
(9a) Support
(10) Armrest
(11) (11a) Slit
(12) Side frame
(12a) Upper part
(12b) Bottom
(12c) Stepped part
(13) Back support
(13a) Upper part
(13b) Bottom
(14) Rib
(15) Backward projection
(16) Boss
(17) Screw insertion hole
(18) Set screw
(19) Boss
(20) Screw hole
(21) Lower stage
(22) Cover
(23) Locking claw
(24) Engagement protrusion
(25) Engagement hole
(26) Flexible piece
(27) Bending part
(28) Meat removal hole
(29) Bending piece
(30) Cushion body
(30a) Entrainment part

Claims (6)

On the upper part of a pair of left and right dorsal fins extending from the lower side of the seat to the rear upper side, a groove that faces in the vertical direction with the front opening is provided. A rearward protrusion formed on the lower rear surface of the side frame portion is fitted to fix the upper portion of the dorsal fin and the lower portion of the side frame portion to each other, and the upper portion of the side frame portion is back from the upper end of the dorsal fin. A structure for attaching a backboard in a chair, characterized in that it has substantially the same shape as a heel and is continuous upward. 2. The structure for mounting a back plate in a chair according to claim 1, wherein the upper part of the dorsal fin and the lower part of the side frame part are fixed to each other with a set screw. The mounting of the back board in the chair according to claim 1 or 2, wherein the cross-sectional shape of the upper part of the side frame part and the upper part of the back saddle is V-shaped or semicircular arc shape that opens forward, or an intermediate shape thereof. Construction. The chair according to any one of claims 1 to 3, wherein the rearward projecting portion is formed by a plurality of ribs projecting on the lower rear surface of the side frame portion and facing the substantially vertical direction with the center portion having the highest dimension. Back plate mounting structure. The mounting structure of the back board in the chair in any one of Claims 1-4 which formed the level | step-difference part between the upper part and the lower part of a side frame part, and contacted the upper end of the backrest to this level | step-difference part. The back plate is formed with slits facing in the vertical direction in the vicinity of both sides, and the slit is used to divide the outer rigid side frame part and the inner flexible back receiving part. The mounting structure of the back board in the chair in any one of Claims 1-5 integrally molded with the resin material.

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