JPH0810088A - Chair - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a chair capable of improving the bending strength of the back plate and improving the finishing state at the edge of the backrest. [Structure] An upper end portion of a back plate mounting portion of a shell plate and an upper end portion 2 of a back plate 5 are bent and bent toward the back side and overlap each other. Therefore, even if the back stretcher 58 stretched on the front surface of the back plate 5 is folded back to the back surface side, the finished state of the end portion is good. Further, on the back surface side of the back plate 5, a ridge portion 56 is formed along the side end portion 55 downward from the upper end portion 52. Upper end of shell plate and back plate 5 and ridge 56
Function as a rib for reinforcement. In the ridge portion 56, the back stretcher 58 folded back to the back surface side of the back plate 5 has a single layer, but is triple in the position adjacent thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair having a back plate attached to a shell plate as a structural core material, and more specifically,
It relates to the structure of the end portion of the back plate.

[0002]

2. Description of the Related Art Among chairs provided with a backrest, a chair in which a seat plate and a back plate are attached to a shell plate which is to be a core material for the structure is a back plate for the purpose of enhancing the user's sitting comfort. And the shell plate is loosely curved.

[0003]

However, since the bending strength of the back plate cannot be made sufficient just by gently bending the back plate as in the conventional case, for example, when peeling the back plate from the shell plate, When a force is applied, the backboard easily deforms. Further, in the case of a back plate on which a cushion material or an upholstery is applied, since the upholstery is folded back to the back side at the edge, there is a problem in that the unsightly portion of the sewing becomes visible on the edge of the backrest.

In view of the above problems, the object of the present invention is to
It is intended to provide a chair capable of improving the bending strength of the back plate and improving the finishing state at the edge of the backrest.

[0005]

In order to solve the above problems, according to the present invention, a seat plate and a back plate are attached to a seat plate mounting portion and a back plate mounting portion of a shell plate as a structural core material, respectively. In the chair, the shell plate has the upper end of the back plate attachment portion bent to the back side, and the upper end of the back plate is
It is characterized in that it is bent to the back side and overlaps with the upper end of the back plate mounting portion.

According to this structure, since the upper ends of the shell plate and the back plate function as reinforcing ribs, the bending strength of the back plate and the shell plate is improved. Further, since the shell plate and the back plate are bent and overlapped on the back side, the cushion material can be turned up to the upper end of the backrest, so that the appearance is good and the sitting comfort is good.

According to another aspect of the present invention, in a chair in which a seat plate and a back plate are respectively attached to a seat plate mounting portion and a back plate mounting portion of a shell plate as a structural core material, a back side of the back plate is provided. Is characterized in that a ridge portion is formed along both end portions from the upper end toward the lower end. With such a configuration, since the ridges function as ribs at both side ends of the back plate, the bending strength of the back plate is improved. In addition, the upper back stretched on the front of the backboard is folded back to the back side of the backboard at the upper end and the side edges, and a single portion and a triple portion of the upper back are generated there. It is preferable that, of the portions, the single portion is on the formation region of the convex portion and the triple portion is on the region adjacent to the convex portion. In this case, the step difference between the single and triple portions of the upholstery can be compensated for by the height of the ridge, so that the back surface of the back plate can be sewn flat. Therefore, the finished state is improved even at the side edge of the backrest. Also in this case, it is preferable that in the shell plate, the upper end of the back plate mounting portion is bent toward the back side thereof, and the upper end of the back plate is bent toward the back side thereof to overlap the upper end of the back plate mounting portion.

Further, it is preferable to form a ridge on the upper end of the back plate along the leading edge thereof to enhance the bending strength.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

[Overall Structure of Chair] FIG. 1 is a side view showing the overall configuration of a chair including a seat portion and a backrest portion according to the present embodiment, and FIG. 2 is a shell plate, leg portions, a back plate, and It is an exploded perspective view showing the structure of a seat plate.

In FIG. 1, a chair 1 of this example includes a leg portion 2 made of a pipe and a seat portion 1 located above the leg portion 2.
2 and a backrest portion 13 extending obliquely upward from the rear end of the seat portion 12. The basic shape of the seat portion 12 and the backrest portion 13 is the shell plate 3 as the core material for the structure.
Stipulated in. That is, the shell plate 3 is a polypropylene resin molded product integrally molded along the shape of the chair 1 to be configured, and has a seat plate mounting portion 31 and a back plate mounting portion 32. Of these, the seat plate mounting portion 31
The seat cushion 4 and the seat plate 4 on which the seat upholstery 44 is stretched are attached to the upper surface of the seat 12, and the seat portion 12 is configured. On the other hand, on the front surface of the back plate mounting portion 31 of the shell plate 3,
The back plate 5 with the back cushion 57 and the back upholstery 58 stretched is attached to form the backrest portion 13. Here, the seat body 4 is one hard board, and the back plate 5 is
It is a molded plate made of polypropylene resin. The seat cushion 43 and the back cushion 57 are relatively thick cushion materials made of urethane resin, and the seat cushion 44 and the back cushion 58 are thin sheets made of cloth or vinyl chloride resin.

In FIG. 2, the leg portion 2 includes a front leg pipe 21 that constitutes a pair of front legs 211 on the left and right, and a rear leg pipe 22 that constitutes a pair of rear legs 221 on the left and right, which are two seats on the left and right sides. It has a structure connected by a pipe 23. Further, the front leg pipe 21 and the rear leg pipe 22 are also connected by leg joint bars 24 and 25 which are connected in two stages at the side. The leg caps 28 are fitted on the front ends of the front legs 211 and the rear legs 221, respectively.

[Structure of Shell Plate] The shell plate 3 is composed of a substantially horizontal seat plate mounting portion 31 and a back plate mounting portion 32 extending obliquely upward from the rear end thereof so as to warp the rear surface.

The seat plate mounting portion 31 has a substantially quadrangular shape in plan view, but has a curved shape in which the central portion is recessed so that the user can sit in a stable state. Seat plate attachment part 3
1, holes 33 for attaching the seat plates 4 are formed at positions near the four corners, and the reinforcing ribs 3 are provided on the upper surface.
10 are formed vertically and horizontally. The end portion of the seat plate attachment portion 31 is formed as a reinforcing portion 311 having a U-shaped cross section, and the inner region of the reinforcing portion 311 is a portion to which the seat plate 4 is substantially attached.

The back plate mounting portion 32 of the shell plate 3 also has a curved shape whose central portion is recessed so that the user can sit in a stable state. The side end portion of the back plate mounting portion 32 is also formed as a reinforcing portion 320 having a U-shaped cross section.
The inner region of 0 is a portion to which the back plate 5 is substantially attached. The seat plate mounting portion 31 and the back plate mounting portion 32 are
The boundary portion 36 is curved and continuous.

In this example, one hole 34 for attaching the back plate 5 is formed at the upper end position of the back plate attaching portion 32 on the left and right, and the convex portions 301 are formed on the left and right in the vicinity thereof. One is formed for each. Further, one positioning protrusion 35 is formed on each of the left and right sides below the convex portion 301. Each of the positioning projections 35 has a claw shape in which the tip end side 352 extends upward from the two base portions 351.

Further, the upper end 321 of the back plate mounting portion 32
As shown in an enlarged view of the AA ′ cross section in the frame, is bent toward the rear in an L-shape and functions as a reinforcing rib.

[Structure of Seat Plate] Similar to the seat plate mounting portion 31 of the shell plate 3, the seat plate 4 has a curved shape with a recessed central portion. The rear end portion 41 of the seat plate 4 is cut into a curved shape along a boundary portion 36 between the seat plate mounting portion 31 and the back plate mounting portion 32. In the vicinity of the four corners of the seat plate 41, the seat plate 4
One screw hole 49 formed by a rosette is formed at a position overlapping with the hole 33 of the shell plate 3 when 1 is stacked on the seat plate attachment portion 31 of the shell plate 3.

[Structure of Back Plate] The back plate 5 has a curved shape in which the central portion is recessed, like the back plate mounting portion 32 of the shell plate 3, and its upper half portion is more warped than the lower half portion. It has a curved shape. In the back plate 5, one rectangular positioning hole 54 is formed in the left and right positions near the lower end, and one screw hole 53 is formed in the left and right positions above the rectangular positioning hole 54. Further, in the vicinity of the screw hole 53, one hole 59 is formed on the left side and one hole 59 is formed on the left side.

As shown in FIG. 3A, the screw holes 53 are formed at positions where they overlap the holes 34 of the shell plate 3 when the back plate 5 is placed on the back plate mounting portion 32 of the shell plate 3. . The screw hole 53 is composed of a rosette 530, and the tip end side of the rosette 530 slightly projects from the back surface side of the back plate 5 and is fitted into the hole 34 shallowly. The hole 59 is formed at a position where it overlaps with the convex portion 301 of the shell plate 3 when the back plate 5 is placed on the back plate mounting portion 32. Positioning hole 54
Is a position where the back plate 5 overlaps with the positioning projection 35 when the back plate 5 is placed on the back plate mounting portion 32. Here, in the positioning hole 54, both the upper surface 541 and the lower surface 542 of the inner peripheral surface are tapered so that the positioning projection 35 can easily enter.

Referring again to FIG. 2, the back plate 5 has its lower end portion 51 bent from the back plate body portion 50 and extending forward. Here, the protruding width of the lower end portion 51 is wide in the central portion and narrows toward both ends. Also, the lower end 5
1 is molded to have a wall thickness corresponding to about ½ of the wall thickness of the back plate body portion 50.

On the other hand, the upper end portion 52 of the back plate 5 has the shell plate 3
Similarly to the upper end portion 321, of the back plate main body portion 50, the back plate main body portion 50 is bent in an L shape and extends rearward, and functions as a reinforcing rib.

Further, on the back side of the back plate 5, as shown in FIG.
As shown in (a) and (b), among the side end portions 55,
The portion near the upper end 52 is a single ridge 56 that forms a step along the side edge from the upper end 52. The ridge portion 56 also functions as a reinforcing rib for the vicinity of the upper end portion 52 of the back plate 5, so that the strength of the back plate 5 is high.

[Exterior Structure of Back Plate] The seat plate 4 and the back plate 5 having such a structure are sewn before being attached to the shell plate 3. In the sewing process for that purpose, as shown in FIG. 5A, a back cushion 57 is overlaid on the front side of the back plate 5, and the surface thereof is covered with a back stretch 58. Back cushion 57
Is approximately the same size as the width of the back plate 5, but the back cover 5
8 is cut larger than the back plate 5. Therefore, the back upholstery 58 is, as shown by the arrow E, the side end portion 55 of the back plate 5.
After being folded back to the back side with, it is fixed with staples 19 or the like as shown in FIG. Also, 5 on the back
After being folded back to the back surface side at the upper end portion 52 of the back plate 5 as shown by the arrow F, 8 is fixed by the staple 19 or the like as shown in FIG. 5C. Therefore, on the back side of the back plate 5, near the corners, the back stretcher 58 has the triple portion T.
(Indicated by a shaded area in the drawing), another portion S where the back upholstery is a single layer occurs. Therefore, in the conventional chair, a step is generated on the back surface side of the back plate 5 due to the difference in the number of the back linings 58 overlapped with each other, so that a finish between the shell plate 3 and the shell plate 3 is unsatisfactory. However, this problem is solved in this example.

That is, in this example, the ridges 56 are formed on the back side of the back plate 5, and the ridges 56 form the ridges 5 on the back.
8 is made to be a single layer, and the back upholstery 58 is made to be triple at a position adjacent to the ridge 56. As a result, the portion S (the surface of the protruding portion 56) where the back stretcher 58 is single is in a state of being raised by an amount corresponding to the height of the protruding portion 56,
The difference in thickness from the triple portion T is corrected. Therefore, in this example, even when the back stretcher 58 is folded back to the back side of the back plate 5, the back side of the back plate 5 is finished flat, so that a gap is generated between the back plate 5 and the shell plate 3. Absent.

Further, as shown in FIG. 6 (a), the upper end 52 of the back plate 5 is bent to the rear side in an L-shape along the upper end 321 of the shell plate 3, so that the upper end of the shell plate 3 is bent. And the upper end 52 of the back plate 5 completely overlap each other. Therefore, the back cushion 57 can be turned up to the upper end of the backrest 13, so that the finish of the upper end is beautiful and the sitting comfort is good. Further, on either side of the back plate 5 and the shell plate 3, the upper end portions 52 and 321 function as reinforcing ribs, and the bending strength of the back plate 5 and the shell plate 3 is high. Even when a force for peeling from 3 is applied, the back plate 5 is difficult to peel from the shell plate 3.

Here, as shown in FIG. 6B, the back plate 5
When the ridge portion 521 protruding downward is formed along the tip edge of the upper end portion 52 of the back plate 5, the upper end portion 52 of the back plate 5 is formed.
The back stretcher 58 folded back at is hidden by the ridge portion 521. Therefore, the finish at the upper end of the backrest 13 is further improved, and the bending strength of the backboard 5 is further improved.

[Structure for Attaching Back Plate and Seat Plate to Shell Plate] After such sewing is performed, the back plate 5 is attached to the shell plate 3. First, in the step of attaching the sewn back plate 5 to the back plate mounting portion 32 of the shell plate 3, as shown by an arrow G in FIG. The positioning protrusions 35 of the shell plate 3 are hooked in the positioning holes 54 of the back plate 5 while being shifted downward. In this state, the back plate 5 is positioned on the shell plate 3. The tip side of the rosette 530 fits into the hole 34 of the shell plate 3, and the back plate 5 is temporarily fixed to the shell plate 3. Further, the convex portion 301 fits into the hole 59. Thereafter, the screw 38 is passed through the hole 34 of the shell plate 3, and the screw 38 is screwed into the screw hole 53 of the back plate 5 as shown in FIG.
Back plate 5, the back plate 5 can be easily attached to the shell plate 3.

As described above, in this embodiment, the shell plate 3 and the back plate 5 are fixed while being positioned by the positioning projections 35 and the positioning holes 54, so that the work is simple. Also,
Since the positioning projections 35 and the positioning holes 54 also exert a force for fixing the back plate 5 to the shell plate 3, two screws 38 are sufficient. Therefore, the assembling work can be simplified, and when the backrest portion 13 is viewed from the back side, the backrest portion 13 has only two screw heads, which is good-looking.

Moreover, in the vicinity of the mounting position of the screw 38,
Since the convex portion 301 is fitted in the hole 59, even if a force is applied to the back plate 5 from the lateral direction, the shearing force applied to the screw 38 is reduced, so that the strength is further improved. Also, by fitting the tip end side of the rosette 530 into the hole 34 of the shell plate 3, the screw hole 53 and the hole 34 can be easily aligned and the shearing force applied to the screw 38 can be reduced. Therefore, even with the two screws 38, the back plate 5 can be fixed to the shell plate 3 with sufficient strength.

In this example, both the positioning protrusion 35 and the convex portion 301 are formed, but only one of them is formed. For example, the convex portion 301 is inserted into the hole 59 as the positioning protrusion and the spine is formed. The plate 5 may be positioned on the shell plate 3.

On the other hand, as shown in FIG. 7A, the seat cushion 43 is attached to the upper surface of the seat plate 5 even in the sewing process of the seat plate 4.
And the surface thereof is covered with a seat cushion 44. Also in this case,
Since the seat upholstery 44 is cut to be larger than the width of the seat plate 4, the seat upholstery 44 is folded back to the back side of the seat plate 4 and then fixed by the staples 19 or the like.

The sewn seat plate 4 is shown in FIG. 7 (b).
After attaching the back plate 5 to the shell plate 3 as shown in
The shell plate 3 is superposed on the seat plate mounting portion 31, and fixed by the screw 39 from the lower surface side of the shell plate 3. At this time, since the lower end portion 51 of the back plate 5 is in the state of entering the seat plate mounting portion 31 from the back plate mounting portion 32 of the shell plate 3, the rear end portion 41 of the seat plate 4 is the lower end of the back plate 5. The part 51 is sandwiched between it and the shell plate 3. Therefore, the back plate 5 is firmly fixed to the shell plate 3, and the sewn back plate 5 and seat plate 4 are in a state in which the end portions are in close contact with each other, which is good-looking. Moreover, since the lower end portion 51 of the back plate 5 is thin, even if the rear end portion 41 of the seat plate 4 is superposed thereon, the seat plate 4 does not float up.

[Structure for Attaching Shell Plate to Leg] In this example, when fixing the shell plate 3 and the leg 2 to each other, as shown in FIG.
The structure shown in (a) and (b) is adopted.

First, in FIG. 8A, in the seat receiving pipe 23 of the leg portion 2, the tip portion 231 is in a state of protruding further forward from the portion fixed to the front leg 21. On the contrary, the rear end portion 232 of the seat receiving pipe 23 is in a state of further protruding rearward from the portion fixed to the rear leg 22. The front end portion 231 and the rear end portion 232 have holes 23 on the lower surface side.
4, 235 are formed. On the other hand, on the back surface side of the seat portion of the shell plate 3, a pair of front and rear tubular portions 36 and 37 are formed in front and back on either the left or right side. Holes 361 and 371 are formed in the tubular portions 36 and 37, respectively.

Further, in the inner part of the rear tubular portion 37, as shown in FIG.
As shown in (b), a receiving plate 372 is formed, and the receiving plate 372 projects toward the insertion port 370 side of the rear tubular portion 37. The receiving plate 372 extends in the axial direction of the tubular portion 37 at a substantially central position in the tubular portion 37, and its width dimension is
It is smaller than the inner diameter of the seat receiving pipe 23. For this reason,
The rear end portion 23 of the seat receiving pipe 23 is provided inside the rear tubular portion 37.
When the 2 is inserted, the backing plate 372 has the rear end portion 23
It is designed to get inside the 2. Also, the receiving plate 3
72 has a hole 3 at a position overlapping the hole 371 of the rear tubular portion 37.
73 is formed.

In the leg portion 2 and the shell plate 3 thus configured, first, after the tip portion 231 of the seat receiving pipe 23 is deeply inserted into the front tubular portion 36 of the shell plate 3,
When the leg portion 2 (seat receiving pipe 23) is displaced rearward, the rear end portion 232 of the seat receiving pipe 23 is fitted inside the rear tubular portion 37. Further, the front and rear positions of the leg portion 2 (seat receiving pipe 23) are adjusted so that the holes 234 and 235 of the seat receiving pipe 23 are adjusted.
Position, and the front tubular portion 36 and the rear tubular portion 3 of the shell plate 2.
When the positions of the holes 361 and 371 of No. 7 are aligned, the receiving plate 372 enters the inside of the rear end portion 23. After that, through the holes 361 and 371 of the shell plate 2 from the outside,
Insert the tap screw 29 into the holes 234 and 235 of the seat receiving pipe 23.
Then, the shell plate 3 and the leg portion 2 are fixed. At this time, the tap screw 29 also stops in the hole 373 of the receiving plate 372.

As described above, in this embodiment, the seat receiving pipes 23 of the leg portion 2 are fixed by the tap screws 29 while being received in the front and rear at two places in the cylinder. Therefore, even if the tap screws 29 are removed, the seat portion 12 (shell plate 3) does not fall off the leg portion 2. In addition, the tap screw 29 has a hole 37 in the rear tubular portion 37.
1 and the hole 373 of the receiving plate 372, it is hard to come off. Even in this case, since the seat receiving pipe 23 is used as the seat receiving member, it is not necessary to form a recess for the receiving plate 372 to enter the end surface of the seat receiving member. Therefore, safety can be improved with a simple structure.

[0039]

As described above, the chair according to the present invention is characterized in that the upper ends of the shell plate and the back plate are bent to the back side. Therefore, in the present invention, since the upper end portion functions as a reinforcing rib, the bending strength of the back plate is improved. Further, since the shell plate and the back plate are bent and overlapped on the back side, the cushion material can be turned up to the upper end portion of the backrest. Therefore, the finished state of the upper end edge is good and the sitting comfort is good.

Further, even when ridges are formed on both sides of the back surface of the back plate, the ridges function as reinforcing ribs, so that the bending strength of the back plate is improved. . Also,
When the triple part of the back upholstery folded back to the back side is located adjacent to the convex part, the part with a single back upholstery is raised by the ridge to eliminate the step difference from the triple part. It Therefore, the finished state of the end portion of the back plate is good.

[Brief description of drawings]

FIG. 1 is a side view of a chair according to an embodiment of the present invention.

FIG. 2 is an exploded view showing structures of a leg portion, a shell plate, a seat plate, and a back plate used in the chair shown in FIG.

3 (a) and 3 (b) are cross-sectional views showing an essential part of the structure for attaching the back plate to the shell plate shown in FIG.

4 (a) is an enlarged perspective view showing an upper end portion and a part of a side end portion of the back plate shown in FIG. 2, and FIG.
It is sectional drawing in a C'line.

5A to 5C are process diagrams showing a sewing process for the back plate shown in FIG.

6A is an explanatory view showing a state where a back plate is attached to the shell plate shown in FIG. 2, and FIG. 6B is a sectional view showing a structure of the back plate according to the improved example.

7 (a) is a process diagram showing a step of sewing the seat plate shown in FIG. 2, and FIG. 7 (b) is a sectional view showing a state where the seat plate is attached to the shell plate.

8A is an explanatory view showing a fixing structure of the shell plate and the leg portion shown in FIG. 2, and FIG. 8B is a sectional view of the fixing portion.

[Explanation of symbols]

 1 ... Chair 12 ... Seat 13 ... Backrest 2 ... Leg 21 ... Front leg pipe 22 ... Rear leg pipe 23 ... Seat receiving pipe 3 ... Shell plate 31 ... Seat attachment part 32 ... Back plate attachment part 321 ... Back plate attachment part upper end 4 ... Seat plate 41 ... Seat plate rear end 43 ... Seat cushion 44 ... Seat tension 5 ... Back plate 51 ... Back plate lower end 52 ... Back plate upper end 55 ... Back plate side end 56 ... Convex ridge 57 ...・ Back cushion 58 ・ ・ ・ Upholstery T ・ ・ ・ Triple back upholstery S ・ ・ ・ Single back upholstery

Claims (5)

[Claims] 1. A chair in which a seat plate and a back plate are respectively attached to a seat plate mounting portion and a back plate mounting portion of a shell plate as a structural core material, wherein the shell plate is the back plate mounting portion. A chair having an upper end bent to the back side thereof, and an upper end of the back plate bent to the back side to overlap the upper end of the back plate mounting portion. 2. A chair in which a seat plate and a back plate are respectively attached to a seat plate mounting portion and a back plate mounting portion of a shell plate as a structural core material, wherein both side ends are provided on the back surface side of the back plate. A chair characterized in that a ridge is formed from the upper end to the lower end along the section. 3. The shell plate according to claim 2, wherein an upper end of the back plate mounting portion is bent to a rear surface side thereof, and an upper end of the back plate is bent to a rear surface side of the back plate mounting portion. A chair characterized by overlapping at the top. 4. The back stretcher stretched on the front surface of the back plate according to claim 2 or 3, is folded back to the back surface side of the back plate at the upper end and both side ends of the back plate, and the back stretcher is placed there. A single part and a triple part of the back lining are generated, and among these folded parts, the single part is on the formation region of the convex portion, and the triple part is a region adjacent to the convex portion. A chair characterized in that. 5. The chair according to claim 1 or 3, wherein a ridge portion is formed along an edge of the top end of the back plate.