JP4202783B2 - Mounting device for backrest in chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an attachment device for a backrest in a chair, in which the backrest is attached to a back attachment portion that stands up from the back of a seat.
[0002]
[Prior art]
Conventionally, in a chair in which a backrest is attached to a backrest that stands up from the back of the seat, the backrest is attached to a back shell such as a synthetic resin inner shell that constitutes the backrest (see, for example, Patent Document 1). ).
[0003]
[Patent Document 1]
Japanese Patent No. 3160564 (Patents 2 to 4, columns 4 to 6)
[0004]
[Problems to be solved by the invention]
Such a conventional backrest mounting structure requires only a small number of assembly steps and is advantageous. However, at the end of the mounting, a screwing operation must be performed, which is complicated. Also, the structure is not always simple.
[0005]
In view of the above-mentioned problems of the prior art, the present invention can be assembled easily and smoothly without screwing work, and the structure is simple and can be manufactured at low cost. The object is to provide a mounting device.
[0006]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) In a backrest mounting device for a chair with a backrest attached to a back mounting portion that stands up from the back of the seat, the back mounting portion is connected to a pair of left and right backrests and the upper portions of both backrests. The backrest is provided with a back shell, a cushion material and a skin material covering substantially the entire back shell, and an opening is provided in the center of the lower surface of the backrest. The connecting plate is provided in the back shell above the opening with a fitting groove for fitting the dowel and the connecting plate, and the dowel and the connecting plate are fitted in the fitting groove. The back shell is provided with engaging means for preventing the dorsal fin and the connecting plate from coming off from the fitting groove by engaging with the back shell.
[0007]
(2) In the above item (1), the engaging means includes a locking claw extending from the back shell and engaging with the lower edge of the connecting plate.
[0008]
(3) In the above item (2), the engaging means is provided below the elastic flexure piece having a pair of left and right engaging claws, and guides the upper end of the connecting plate by deflecting it forward. A guide piece directed to the lower inclined surface of is provided.
[0009]
(4) In the above item (2) or (3), a pair of left and right locking claws are provided on the elastic bending piece facing downward and separated from each other in the left and right direction. By forming a gap between the elastic bending piece and the coupling plate between the locking claws and inserting a pointed tool into the gap, the engagement between the locking claw and the coupling plate can be released. To do.
[0010]
(5) In any one of the above items (1) to (4), the back shell is formed of a flexible material, and the fitting groove is inserted through the pair of left and right dorsal fins. It shall consist of a hole and the penetration slit which a connection board fitted, and the inner diameter of the said penetration hole shall be slightly smaller than the outer diameter of a dorsal fin.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a partially cutaway side view of a chair provided with an embodiment of the present invention, with the backrest removed. The chair (A) has a pedestal (2) erected at the center of a leg (1) having four or five legs that radiate, and a base frame on the upper end of the pedestal (2). (3) is fixed, and a seat (4) is mounted on the base frame (3).
[0012]
From the base frame (3), two dorsal fins (5) (see FIG. 2) extend rearward and rise upward at the rear of the seat (4). The backrest (6) is attached to the two backrests (5) extending in parallel. The present invention relates to a mounting structure for the backrest (5) and backrest (6).
[0013]
As shown in FIGS. 1 to 3, the lower part and the front part of the two dorsal fins (5) protruding forward are covered with the dorsal cover (7). As shown by a broken line in FIG. 3, the dorsal cover (7) covers the left and right dorsal fins (5) separately at the front part, and the left and right parts are integrated at the bent part upward at the rear part. Covers 杆 (5). In the upward bent portion, the front edge portion (7a) protrudes short upward (FIG. 2), and a notch portion (23a) of a backrest lower cover (22) described later is formed on the front edge portion (7a). Is designed to fit.
[0014]
Moreover, each end part of the rectangular connection board (8) which faces the left-right direction is welded to the upper part of two parallel dorsal fins (5). Also below the coupling plate (8), although member connecting Ryose杆(5) are shown, between this member and the coupling plate (8), at least some of the gaps (8a) is Is formed.
[0015]
The backrest (6) is like a leather covering the back shell (9), which is an integrally molded product of hard synthetic resin material, a cushioning material (10) such as foamed polyurethane covering the front surface, and a cushioning material (10). It consists of an outer skin material (11).
[0016]
At the lower end of the back shell (9), a flat mounting piece (12) (see FIG. 2) extending forward to the vicinity of the front end of the cushion material (10) is formed. A rectangular recess (13) is formed (opening through the mounting piece (12)). That is, an opening (13a) (see FIG. 5) is formed at the center of the lower surface of the backrest (6). The cross-sectional shape of the recess (13) is well shown in FIG. 1, FIG. 3, FIG. 5 and FIG.
[0017]
In the recess (13), a connecting block (14) as shown enlarged in FIG. 4 is accommodated. The connecting block (14) is an integrally molded product of a hard synthetic resin material, and the rectangular parallelepiped block portion (14a) constituting the connecting block (14) is located at a position corresponding to the above two dorsal fins (5). A fitting groove comprising two vertical through holes (15a) through which these are inserted and a vertical through slit (15b) through which the through holes (15b) are inserted at positions corresponding to the connecting plate (8). 15) is drilled.
[0018]
It is preferable to provide a plurality of ribs facing in the vertical direction as shown in FIG. 4 on the inner surface of each through hole (15a), and the inner diameter of each through hole (15a), more specifically, the tip surface of each rib The diameter of the inscribed circle to be connected is preferably slightly smaller than the outer diameter of the dorsal fin (5).
By doing so, when the dorsal fin (5) is fitted to each through hole (15a), the width of the through slit (15b) is slightly expanded, and the inner diameter of each through hole (15a) is the dorsal fin (5). The block portion (14a) is elastically deformed so as to match the outer diameter of the inner wall of the through hole (15a), and the dorsal fin (5) and the block portion (14a) The rattling can be prevented, and the dimensional error between the dorsal fin (5) and the through hole (15a) can be absorbed.
In this example, the cross-sectional shape of the dorsal fin (5) and the through hole (15a) is circular, but it may be square or other shapes.
[0019]
Further, a plate-like extension portion (14b) extends downward from the lower end rear portion of the block portion (14a) in the connecting block (14), and the center in the left-right direction of the front surface of the extension portion (14b) The elastic bending piece (16) having a certain width in the left-right direction protrudes diagonally forward and downward.
[0020]
A pair of left and right engaging claws (17) and (17) projecting forward are formed at the left and right ends of the elastic bending piece (16). The front ends of the respective locking claws (17) facing forward are sharply pointed, and the upper surface (17a) thereof is substantially horizontal.
[0021]
A notch (16a) is formed in a portion between the pair of left and right engaging claws (17) and (17) in the elastic bending piece (16) toward the base portion of the elastic bending piece (16). (See FIG. 4).
[0022]
Further, two triangular guide pieces (18) and (18) in a side view are directed forward at the lower sides of the two locking claws (17) and (17) on the front surface of the extension (14b). Protruding. Both guide pieces (18) and (18) guide the connecting plate (8) when the backrest (6) is inserted into the backrest (5), and this is connected to the lower inclined surface of the locking claw (17). This is a means for elastically moving the locking claw (17) and the elastic bending piece (16) backward. In other words, the guide pieces (18) and (18) are also for preventing the connecting plate (8) from entering behind the elastic bending piece (16).
[0023]
In FIG. 2, FIG. 3, FIG. 5 and FIG. 6, a holding plate (19) is shown. This retainer plate (19) is a horizontally long rectangular plate that is applied to the rear side of the block (14a) of the connecting block (14) fitted in the space (12) of the back shell (9), and is attached to both left and right ends. By inserting a screw (20) into the mounting hole (19a) drilled in the part and screwing it into the screw hole (21) drilled in the rear surface of the back shell (9), the connecting block (14) is It is firmly fixed to the back shell (9).
[0024]
As shown in FIGS. 2 and 3, the backrest lower cover (22) is an integrally molded product of a hard synthetic resin material, and the upper surface thereof is substantially the outline of the attachment piece (12) at the lower end of the back shell (9). The front surface is formed with a notch (23a) having a front and a lower opening at the center in the left-right direction, and the lower surface has a width in the left-right direction shorter than that of the upper surface. There is an outline (23) that has an outline that substantially matches the outline of the upper end of the eaves cover (7), and that allows the two back eaves (5) and the connecting plate (8) to be inserted with a margin. Is formed. The backrest lower cover (22) is attached to the attachment piece (12) of the back shell (9) with a screw (24) when it protrudes in the left-right direction from the contour of the lower surface.
[0025]
The process of attaching the backrest (6) will be described as follows.
First, the connecting block (14) is fitted into the recess (13) formed in the rear surface of the back shell (9) of the backrest (6) shown in FIG. Secure to the back of the back shell (9) with screws (20).
[0026]
Separately, as shown in FIG. 1, the lower back cover (22) is inserted from above the left and right back (5) (5) connected by the connecting plate (8), and the back cover ( 7) Place it on the top edge.
[0027]
Next, the opening (13a) of the attachment plate (12) at the lower end of the backrest (6) is inserted from above the connecting plate (8) and the backrest (5) (5). The upper end of the connecting plate (8) contacts the lower inclined surface of the guide piece (18), is deflected forward, and heads toward the lower inclined surface of the locking piece (17). When reaching the lower inclined surface of the locking piece (17), the locking piece (17) is pushed backward and the elastic bending piece (16) is bent backward, and still rises. This state is shown in FIG.
[0028]
After the dorsal fin (5) (5) and the connecting plate (8) are fitted into the fitting groove (15), when the lower end of the connecting plate (8) gets over the engaging claw (17), the engaging claw is immediately (17) enters the gap (8a) immediately below the connecting plate (8) and engages with the lower end of the connecting plate (8), and the connecting block (14) and the back shell (9 ) As a result, the backrest (6) is fixed. This state is shown in FIG.
[0029]
Finally, the lower back cover (22) is fixed to the back shell (9) with screws (24).
[0030]
When removing the backrest (6), remove the screw (24) and slightly shift the backrest lower cover (22) backwards. At that time, the rear end of the backrest cover (7) and the backrest lower cover ( 22) Insert a pointed tool (25) such as a screwdriver into the gap formed between the rear edge of the opening (23) of 22) as shown by an imaginary line in FIG. (17) Push into the gap (16a) between the connecting plate (8) and the elastic flexure piece (16) between (17). Then, the elastic bending piece (16) is bent backward, and the locking claw (17) is detached from the lower end of the connecting plate (8), so that the backrest (6) can be pulled out.
[0031]
In the above example, the connecting block (14) is formed separately from the back shell (9) and then fitted into the recess (13) of the back shell (9) and fixed. The block (14) may be formed integrally with the back shell (9).
[0032]
【The invention's effect】
According to the first aspect of the present invention, the backrest can be attached in a one-touch manner simply by fitting the backrest to the back mounting portion, that is, the backrest, and it is not necessary to perform the screwing operation, so that the assembly is simple. In addition, since it is only necessary to provide the back shell with a fitting groove and an engaging means that allow the back plate to be fitted with the connecting plate, the structure is simple and it can be manufactured at low cost.
[0033]
According to the second aspect of the invention, the backrest can be locked easily and reliably.
[0034]
According to the third aspect of the present invention, the locking claw engages with the lower end of the connecting plate, so that the backrest does not come off the backrest, and the backrest is securely attached to the backrest.
[0035]
According to invention of Claim 4, a backrest can be easily removed from a backrest, and it is convenient for separating for every material at the time of disposal.
[0036]
According to the fifth aspect of the present invention, when the dorsal fin is fitted to each through hole, the width of the through slit is slightly expanded and the inner diameter of each through hole is matched with the outer diameter of the dorsal fin. The shell is elastically deformed and the dorsal fin is in close contact with the inner surface of each through hole, which can prevent rattling between the dorsal shell and the back shell, and can absorb dimensional errors between the dorsal fin and the through hole. it can.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing a state just before attaching a backrest to a backrest in a chair including an embodiment of the present invention.
FIG. 2 is an exploded perspective view, partly broken away.
FIG. 3 is an exploded perspective view as seen from the rear with a part broken away.
FIG. 4 is an enlarged perspective view of a connection block, similarly.
FIG. 5 is an enlarged longitudinal sectional side view of the vicinity of the attachment device showing a state in the middle of inserting the backrest into the backrest.
FIG. 6 is an enlarged vertical side view of the vicinity of the attachment device, showing a state where the backrest has been inserted into the backrest.
[Explanation of symbols]
(A) Chair
(1) Leg
(2) Pillar
(3) Base frame
(4) Seat
(5) dorsal fin
(6) Backrest
(7) Back cover
(7a) Front edge
(8) Connecting plate
(8a) Clearance
(9) Back shell
(10) Cushion material
(11) Skin material
(12) Mounting piece
(13) Recess
(13a) Opening
(14) Connecting block
(14a) Block part
(14b) Extension
(15) Mating groove
(15a) Through hole
(15b) Through slit
(16) Elastic flexure
(16a) Clearance
(17) Locking claw
(17a) Top surface
(18) Guide piece
(19) Holding plate
(19a) Mounting hole
(20) Screw
(21) Screw hole
(22) Backrest lower cover
(23) Opening
(23a) Notch
(24) Screw
(25) Tip tool

Claims (5)

In the mounting device for the backrest in the chair with the backrest attached to the back mounting portion that stands up from the back of the seat,
The back mounting portion includes a pair of left and right dorsal fins and a connecting plate that couples the upper portions of the dorsal fins, and the backrest includes the back shell and substantially the entire back shell. It is provided with a covering cushion material and a skin material, and an opening is provided at the center of the lower surface of the backrest, and a fitting groove for fitting the backrest and the connecting plate is provided in a back shell above the opening, and An engagement means for retaining the dorsal fin and the connecting plate from the fitting groove by engaging the connecting plate in a state where the dowel and the connecting plate are fitted in the fitting groove. A mounting device for a backrest in a chair, characterized in that a back shell is provided. 2. The apparatus for attaching a backrest in a chair according to claim 1, wherein the engaging means includes a locking claw extending from the back shell and engaging with the lower edge of the connecting plate. A guide piece that is provided below the elastic bending piece having a pair of left and right engaging claws in the engaging means, guides the upper end of the connecting plate by deflecting it forward, and faces the lower inclined surface of the engaging claws. The backrest mounting apparatus in the chair of Claim 2 provided. A pair of left and right locking claws are provided on the downward elastic bending piece so as to be separated from each other in the left and right direction, and the elastic bending piece between the locking claws and the connecting plate are engaged with the connecting plate. A backrest attachment in a chair according to claim 2 or 3, wherein a gap is formed between the two, and a pointed tool is inserted into the gap so that the engagement between the locking claw and the connecting plate can be released. apparatus. The back shell is made of a flexible material, and the fitting groove includes a through hole in which a pair of left and right back hooks are fitted, and a through slit in which a connecting plate is fitted. The mounting device for a backrest in a chair according to any one of claims 1 to 4, wherein the through hole has an inner diameter slightly smaller than an outer diameter of the backrest.

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