JPS6132531Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of the backrest and seat plate of a chair. The frame and seat board have a structure in which the outer frame, which serves as the lower frame, is overlapped to form the backrest and seat board, making it easy and secure to connect the inner frame and the outer frame, and the connecting member is attached to the outside. The purpose is to make the appearance beautiful after assembly by preventing the parts from being exposed.

Conventionally, in this type of backrest and seat board, the inner frame and outer frame were overlapped and fastened together from the outside of the outer frame at a predetermined position using screws, etc., so members and structures for fastening were required. This not only complicates the structure, but also has the drawback that the screw heads are exposed on the outer surface of the outer frame, spoiling the appearance.

The present invention was devised to eliminate the above-mentioned drawbacks of the conventional technology, and will be explained in detail in the attached illustrations of the backrest below. A hole 3 for fitting and mounting is provided,
On the front side of the outer frame 1, which has circumferential ribs 2 bent over the entire circumference, reinforcing rib strips 4 are provided in the lateral direction at regular intervals or in a desired shape such as a line shape or a lattice shape, The rear surface of the inner frame 5 is brought into contact with the front end of each reinforcing rib strip 4, and the inner frame 5 can be fitted and attached within the circumferential rib 2. The inner frame 5 has a cushion body 7 made of urethane foam or other material on the front surface of the substrate 6, and the periphery of the seat cover 8 made of cloth or synthetic resin sheet covering the surface of the cushion body 7 is attached to the substrate 6.
It is rolled up and fixed to the rear surface, and bent latch pieces 9 are provided diagonally in a predetermined position of the board 6 in a uniformly protruding state upward (facing right in Fig. 1) or downward in the same direction. Attachment holes 10 are provided for each bent hook piece 9 in a corresponding reinforcing rib strip 4 of the outer frame 1.
. . as shown in FIG.
The bent edge 11 formed at the upper or lower end is joined to the inner surface of the upper or lower edge of the circumferential rib 2 of the outer frame 1, and the inner frame is tightened with a screw 12 screwed from the outside of the upper or lower edge. 5 and the outer frame 1. The bent latching piece 9 is provided diagonally with respect to the board 6, and has a protrusion 13 formed on the oblique side 9' of the inclined portion, and extends the tip of the oblique side 9' in the direction of the bent edge 11 to attach the board. A bent portion 9'' is formed approximately parallel to the inner frame 5 and the outer frame 1.
To fit and lock the mounting hole 10, first insert the bent portion 9'' into the mounting hole 10 as shown in FIG.
Screw the screw 12 inserted into the bent edge 11 so that the bent part 9'' is fitted in the direction of deep insertion into the mounting hole 10, and the protrusion 13 of the oblique side 9' is fitted to the inner edge of the mounting hole 10. Temporarily fasten the inner frame 5 so that they are in contact with each other, and then, as shown in FIG. By deforming (tilting) the oblique side 9' and the protrusion 13 into the mounting hole 10 as shown in FIG. It is connected to the upper or lower edge.In practice, the outer frame 1 is formed by integrally molding a synthetic resin, and the base plate 6 and the bent hook 9 of the inner frame 5 are made of a steel plate or a synthetic resin material, preferably a steel plate. In addition, the above structure can be used as it is as a seat plate of a chair, in which case the outer frame 1 will be the lower frame of the seat plate, the inner frame 5 will be the upper frame of the seat plate, and the above-mentioned Hole 3 for fitting the backrest rod in the outer frame 1
is omitted, and instead a column attachment portion is formed on the lower surface of the outer frame 1.

In the backrest structure of the present invention as described above, the inner frame 5 and the outer frame are connected by the fitting latches of the bending latching pieces 9 and the mounting holes 10. Since the latching piece 9 is provided obliquely to the board 6, the bent latching piece 9 and the inner edge of the mounting hole 10 can be firmly held in contact with each other without wobbling.
Furthermore, the size of the mounting hole 10 may be set to be larger than the cross section of the bent latch piece 9 with some allowance,
It is easy to manufacture because it does not require high-precision machining, and the connection can be ensured by simply tightening a single screw 12 attached to an inconspicuous area on the outer edge of the outer frame 1. Furthermore, since only one screw 12 is used in an out-of-the-way location, there is no need to worry about damaging the appearance of the backrest or seat plate.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional side view showing one embodiment of the present invention, Fig. 2 is a perspective view of the exploded state, Fig. 3 is a longitudinal cross-sectional view of the main part showing the bending latch piece and the mounting hole being engaged; FIG. 4 is a longitudinal cross-sectional view of the main part showing the fitted and locked state. 1: Outer frame, 2: Peripheral rib, 4: Reinforcement rib strip, 5:
Inner frame, 6: Board, 9: Bent latching piece, 10: Mounting hole, 11: Bent edge, 12: Screw.

Claims (1)

[Scope of Claim for Utility Model Registration] From the combination of an outer frame 1 that serves as a rear frame for the backrest and a lower frame for the seat plate, and an inner frame 5 that serves as a front frame for the backrest and an upper frame for the seat plate. In the backrest and seat plate, a circumferential rib 2 is formed around the entire circumference of the outer frame 1, and reinforcing rib strips 4 are provided on the inner surface; The rear surface or the lower surface can be brought into contact with the tip of the full reinforcing rib strip 4..., and a bending latching piece 9... is provided obliquely in the same direction with respect to the surface of the substrate 6 at a predetermined position, and the bending latching piece 9... The piece can be fitted into a mounting hole 10 formed in a predetermined reinforcing rib strip 4 of the outer frame 1, and is formed at an appropriate position on the periphery of the substrate 6 in the direction of inclination of the bent latching piece 9. A backrest and seat plate structure for a chair in which a bent edge 11 can be screwed to a proper position on a circumferential rib 2 of an outer frame 1.