JPH0612686Y2 - Chair backrest and seat structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a backrest plate and a seat plate structure of a chair, and more specifically, to a backrest plate and a seat integrally formed with a hollow body so as to be easily attached to a chair body. Regarding the structure of the board.

[Conventional technology]

Conventionally, various backrest boards and seat board structures that are bolted to the body of the chair have been provided, but for wooden chairs for school children that are stable and warm, one piece of plywood is used. Most of them have a cushion attached to the surface thereof, and regarding the attachment structure to the chair body, for example, in the supporting rod extending upward from the chair body as started in JP-B-58-40925. When installing the backrest board,
Although two screws were attached to both sides of the backrest plate at a total of four positions, the number of assembling steps, cost and ease of assembling were large. Further, when the backrest plate and the seat plate were blow-molded into a hollow shape for the purpose of reducing the manufacturing cost, an appropriate mounting structure was not provided, and the wall thickness was formed thick to maintain the strength. Therefore, the material cost was not necessarily low.

[Problems to be solved by the device]

In view of the above-mentioned situation, the present invention is to solve the problem that the hollow backrest plate and the seat plate can be easily and firmly attached to the mounting portion of the chair body without rattling, It is a point to provide an inexpensive backrest plate and seat plate structure of a chair that has high strength against surface pressure and is also excellent in breathability.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention has a screw hole at one end of each side of the backrest plate or seat plate of a hollow-molded chair, into which a bolt that penetrates the mounting portion of the chair body is screwed. A reinforcing rib formed by embedding a connecting metal fitting that is provided with a protrusion that can be fitted into a stop hole formed in the attachment portion at the other end, and further by recessing the facing positions on both the front and back sides and welding each other in the central portion. Is provided at a plurality of positions, and the backrest plate and the seat plate structure of the chair are configured by providing ventilation holes penetrating the front and back sides at the welded portions of the reinforcing ribs.

Then, at least on the front side, a cushion made of a porous foam having air permeability was joined and the whole was cross-tensioned.

[Action]

The chair back plate and seat plate structure of the present invention having the above-described contents are attached to the backrest plate of the chair or the attachment of the chair body to the screw hole of the connecting metal fitting embedded in one end of each side of the seat plate. It is attached by screwing a bolt that penetrates the part and inserting a protrusion formed on the other end into a stop hole formed in the attachment part, and by a seated person on the backrest plate or seat plate. Even if surface pressure is applied, the reinforcing ribs that are recessed at the opposing positions on both the front and back sides and welded to each other at the central portion are provided at multiple locations, so that the front and back surfaces are integrated with the curvature and the multiple ribs reduce the size. Since we will make a cell structure,
The strength is increased.

In addition, ventilation holes penetrating the front and back are provided in the welded portion of the reinforcing ribs, and a cushion made of a porous foam having air permeability is attached to at least the surface side, and the entire surface is cross-tensioned to improve the air permeability of the front and back. Make it better.

〔Example〕

The present invention will be further described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows a chair assembled by applying the backrest plate and seat plate structure of the present invention, and FIG. 2 shows an exploded perspective view thereof, in which 1 is a backrest plate, 2 is a seat plate, Reference numeral 3 denotes a chair body, respectively.

The backrest plate 1 and the seat plate 2 are manufactured by blow molding into a hollow shape in a similar manner except that the shapes are slightly different. One side end of each side surface 4, that is, the backrest plate 1 is Is preferably an upper end portion, and a front end portion of the seat plate 2, a connecting fitting 5 is embedded inside the end portion, a screw hole 6 is formed in the connecting fitting 5, and the other end portion is provided with a side. The projection 7 is formed so as to project toward one side. The backrest plate 1 and the seat plate 2 are
Instead of integrally molding into a hollow shape, it is of course possible to perform blow molding in front and rear or up and down in two, and then weld or adhere both.

In the chair body 3, in the present embodiment, a front supporting rod 8 is provided at a front portion, and a rear supporting rod 9 which is longer than the front supporting rod 8 is integrally connected to an upper horizontal rod 10 and a lower horizontal rod 11 in a standing state. The frame 3a and the frame 3b having the same shape as the frame 3a are opposed to each other, and the footrest plate is provided between the front support rods 8 and 8.
12 and both rear supporting rods 9 and 9 are formed by connecting connecting rods 13 by bolting. A through hole 15 for laterally inserting the bolt 14 is formed at the upper end of the upper portion of the rear supporting rod 9 which is a mounting portion for mounting the backrest plate 1, and a predetermined space, that is, the above, is formed below the through hole 15. The stop holes 16 are formed by opening the stop holes 16 inward at an interval equal to the interval between the screw holes 6 and the projections 7 of the backrest plate 1, and the stop holes 16 and 1 provided on both rear supporting rods 9 and 9.
6 are arranged to face each other. Further, the upper end of the front supporting rod 8 and the upper horizontal rod 10 which are the mounting portions for mounting the seat plate 2 respectively have through holes 15 through which the bolts 14 are inserted from the side at the upper end of the front supporting rod 8 in the same manner as described above. Together with forming
A stop hole 16 is formed inwardly in the rear portion of the upper horizontal rod 10 in the same manner as described above. In this embodiment, the chair body 3 having the above structure is used.
However, the present invention is not limited to this, and can be applied to a pipe chair or a swivel chair having a similar mounting portion.

More specifically, the structure of the backrest plate 1 and the seat plate 2 will be described. As shown in FIGS. 3 and 4, the connecting fitting 5 has a screw hole 6 formed in the inner axial direction and a tip end portion of which is screwed. axis
The outer shape of 17 is a normal screw shape, and a square or hexagon wrench is formed inside the head 18 as a square hole 19 communicating with the screw hole 6. Then, the end portions of the backrest plate 1 and the seat plate 2 on the rear surface side close to the side surface 4 are depressed to leave the side surface 4 to form a recessed portion 20, and the screw shaft 17 of the connecting fitting 5 is opened to the side surface 4. The screw shaft 17 is screwed into the hole and the tip thereof is positioned in the recess 20.
Fit the ring 21 to prevent it from loosening.

In addition, the opposing positions of the front plate 22 and the back plate 23 of the backrest plate 1 and the seat plate 2 are depressed and heat or ultrasonically welded to each other at the central portion to form the reinforcing ribs 24. As shown in FIG. 5, the front plate 22 and the back plate 23 are arranged in a plurality of places as shown in FIG. 5, and the polygonal shape connecting the reinforcing ribs 24, ... By forming a large number, a large number of small cell structures are formed inside the hollow to enhance the strength. Further, the welded portion 25 is provided at the center.
A vent hole 26 is formed at the center of the hole so as to penetrate the front and back surfaces of the air vent so that air flows through the front and back surfaces.

Also, as shown in FIG. 4, the backrest plate 1 and the seat plate 2 of the present invention.
A cushion 27 made of a porous foam having air permeability is joined to the front side of the surface plate 22, that is, the upper surface of the surface plate 22, and a cloth 28 is stretched over the entire outer surface so as not to impair the air permeability to the front and back sides. I have to.

Then, in order to mount the backrest plate 1 and the seat plate 2 on the chair body 3, as shown in FIG. 3, at the same time as the work of connecting the frame body 3a and the frame body 3b with the footrest plate 12 and the connecting rod 13. As described above, the respective protrusions 7 formed on both side surfaces 4 of the backrest plate 1 and the seat plate 2 are fitted into the stop holes 16 formed in the mounting portion, and then the backrest plate 1 and the seat plate 2 are centered on the protrusions 7. When rotated, the through holes 15 formed in the mounting portion of the chair body 3 and the screw holes 6 of the connecting metal fitting 5 attached to the side surface 4 are aligned with each other, and the through holes 15 are laterally bolted to the respective through holes 15. By inserting 14 and screwing it into the screw hole 6, the mounting is completed as shown in FIG. Before the backrest plate 1 and the seat plate 2 are attached to the chair body 3, the cushion 27 and the cloth 28 are attached.

[Effect of device]

According to the backrest plate and the seat plate structure of the chair of the present invention as described above, the backrest plate or the seat plate of the hollow-molded chair is pierced through the mounting portion of the chair body at one end of each side surface. A connecting metal fitting having a screw hole into which a bolt is screwed is embedded, and a projection that can be fitted into a stop hole formed in the mounting portion is provided at the other end, and the opposite position on both front and back surfaces is depressed to form a central portion. Since reinforcing ribs are welded to each other at a plurality of locations, and ventilation holes are provided through the front and back of the welded portion of the reinforcing ribs, the mounting portion of the body is drilled at the same time when the chair body is assembled. A projection formed at one end of both sides of the backrest plate and seat plate was inserted into the stop hole, and a bolt inserted from the side into the through hole formed in the mounting part was embedded at the other end of both sides. The backrest plate and seat plate can be simply screwed into the screw holes of the connecting metal fittings. It is possible to mount only the fastening work of the respectively two bolts, since by the other to the fitting projections and Tomeana can be attached firmly without rattling. Further, since the opposing positions on both the front and back surfaces are depressed and welded together at the central portion to form the reinforcing rib, the front and back surfaces are integrated by the rib, and a small cell structure partitioned by the rib inside the center is formed. Even if a large number of seats are formed and the seat pressure is applied, the strength against bending is high, so the wall thickness can be made thin and the material cost can be reduced, and the structure is simple and easy to assemble. As a result, it is possible to reduce the assembly cost.In addition, moisture caused by perspiration of the seated person is diffused from the front side to the back side through the ventilation hole, or the contact part between the seated person and the backrest plate and seat plate is passed from the back side to the front side through the ventilation hole. The cold air flowing into the body can suppress sweating and maintain a comfortable sitting state.

In addition, at least on the front side, a cushion made of a porous foam having air permeability is joined, and the whole is cross-tensioned to provide cushioning properties, and the backrest plate and the surface plate of the seat plate come into contact with the seated person. This prevents the seat cushion from passing through the seated person, and through the ventilation holes of the reinforcing ribs to form the ventilation passage to the back surface, which creates a more comfortable seated state.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a chair to which the present invention is applied, FIG. 2 is an exploded perspective view showing a state in which a backrest plate and a seat plate are similarly attached, and FIG. 3 is a backrest plate as a mounting portion of a chair body. FIG. 4 is a partial sectional view of the backrest plate or seat plate, and FIG. 5 is a partial sectional view of the backrest plate attached to the mounting portion of the chair body. It is a partial rear view shown by. 1: backrest plate, 2: seat plate, 3: chair body, 3a, 3b: frame body, 4: side surface, 5: connecting metal fitting, 6: screw hole, 7: protrusion,
8: Front supporting rod, 9: Rear supporting rod, 10: Upper lateral rod, 11: Lower lateral rod, 1
2: Foot rest plate, 13: Connecting rod, 14: Bolt, 15: Through hole, 1
6: Stop hole, 17: Spiral shaft, 18: Head, 19: Square hole, 20: Recessed part, 21: E ring, 22: Front plate, 23: Back plate, 24: Reinforcing rib, 25: Welded part, 26: Vent, 27: Cushion, 28:
cross.

Claims (2)

[Scope of utility model registration request] 1. A connecting metal fitting having a screw hole into which a bolt penetrating a mounting portion of a chair body is screwed is embedded in one end of both sides of a backrest plate or a seat plate of a hollow molded chair. , The other end is provided with a protrusion that can be fitted into the stop hole formed in the mounting portion, and further provided with a plurality of reinforcing ribs, which are formed by recessing the facing positions of the front and back surfaces and welding each other in the central portion, A backrest plate and a seat plate structure of a chair, characterized in that ventilation holes penetrating to the front and back are provided in the welded portions of the reinforcing ribs. 2. A backrest plate and a seatboard for a chair according to claim 1, wherein a cushion made of a porous foam having air permeability is joined to at least the front side and the whole is cross-tensioned. Construction.