JPH0114217Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention mainly relates to a foldable chair in which a flat seat plate is attached to a frame made of a pipe.

Conventional Technology Foldable chairs, which have a flat seat plate attached to a frame made of pipes, have been widely used in the past, but since these types of chairs are used by being moved from place to place, It is important that the device be lightweight so that it can be easily moved, and that it be strong enough so that it will not be damaged even if it is repeatedly folded and moved.

Conventionally, in order to reduce the weight of this type of folding chair, it is known and used that the seat plate is made of plastic, but the plastic seat plate has sufficient strength to withstand the sitting load. In order to hold it, a pipe frame is fitted around its periphery, and it is attached to a foldable frame.

Problems to be solved by the invention By the way, as mentioned above, in the structure in which the pipe frame is fitted around the periphery of the plastic seat plate, it is necessary to make the fit between the seat plate and the pipe frame tight and to In order to increase the strength, it is possible to make the concave groove formed on the periphery of the seat plate sufficiently deep in relation to the outer diameter of the pipe frame, but on the other hand, it is extremely difficult to fit the pipe frame to the periphery of the seat plate. Therefore, in conventional chairs of this type, the strength of the fit between the seat plate and the pipe frame around it is low;
The reality is that chairs cannot have the sufficient strength required.

In view of the problems of the conventional ones, the present invention consists of a flat plate with a hollow double-walled structure made by blow molding thermoplastic plastic, and a long upper edge on the periphery of the seat. By forming the concave groove with a short protruding lower edge, the concave groove on the peripheral edge of the seat plate and the pipe frame are sufficiently engaged with each other in the seat load direction, thereby increasing the bonding strength between the seat plate and the frame. In addition, the seat plate itself has the elasticity to expand and contract, and the lower edge of the groove is shortened. It is an object of the present invention to provide a chair in which the pipe frame can be easily fitted to the seat plate by widening the opening width of the concave groove relative to the pipe frame.

Means for Solving the Problems The present invention has been constructed as follows as a technical means for achieving its purpose.

That is, the chair is constructed by attaching a seat plate to a frame made of a pipe, and the seat plate is blow-molded from thermoplastic plastic to form a flat plate with a hollow double wall structure. A chair characterized in that a concave groove having a long upper edge and a short protruding lower edge is formed on the periphery, and a pipe frame surrounding the periphery of the seat plate is tightly fitted into the groove. This is what I did.

Function In the chair according to the present invention, a concave groove having a long upper edge and a short protruding lower edge is formed on the periphery of the seat plate. The engagement state in the seat load direction is sufficient,
Its bond strength is high. In addition, the lower edge of the groove protrudes short and the opening width of the groove is wide, and the seat plate has a hollow double wall structure made of thermoplastic plastic and has elasticity so that it expands and contracts. It is easy to fit the pipe frame to the pipe frame.

Example An embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a collapsible frame made of a pipe, and this frame 1 is constructed by connecting a support body 3 to a frame main body 2 by bending arms 4, 4 in a collapsible manner. 5 is the seat board,
The seat plate 5 is blow-molded from thermoplastic plastic to form a flat plate with a hollow double wall structure, and a groove 6 is formed in the periphery of the seat plate 5. This concave groove 6 is for tightly fitting the pipe frame 7, and has a long upper edge 6a and a short lower edge 6b. Beyond the center position and with a length shorter than the outer diameter of the pipe frame 7, the lower edge 6
b has a length that does not reach the axial center position of the pipe frame 7. A pipe frame 7 is tightly fitted into the groove 6 on the periphery of the seat plate 5, and the periphery of the seat plate 5 is surrounded by the pipe frame 7. The front and rear approximately intermediate portions are pivotally connected to the frame main body 2 by pins 8, and the rear portions on both sides are pivotally connected to the support body 3 by pins 9, so that the seat plate 5 is connected to the frame 1. It is installed so that it can be folded freely. Reference numeral 10 denotes a back plate, which is blow-molded from thermoplastic plastic to form a flat plate with a hollow double wall structure, and has holes 1 on both sides thereof.
1 and 11 are fitted to the upper edge of the frame main body 2 to be integrally attached. A handle hole 12 is formed in the back plate 10.

The means for attaching the back plate 10 to the frame main body 2 may be as shown in FIG. That is, the upper edge of the back plate 10 is formed with a concave groove 13 into which the pipe frame is fitted, and the upper end of the frame main body 2 is shaped into an arc along the upper edge of the back plate 10 connecting the left and right sides. Then, the groove 13 of the back plate 10 is fixed to the frame main body 2 by screwing self-tapping bolts 14 or the like.

In addition, as the thermoplastic plastic constituting the seat plate 5 and the back plate 10, polyethylene, polypropylene, vinyl chloride, polyamide, polystyrene, ABS resin, etc. are used. The frame 1 is mainly composed of metal pipes.

In the chair constructed as described above, the seat plate 5 is blow-molded from thermoplastic to form a flat plate with a hollow double wall structure, and the seat plate 5 has an upper edge 6 at its periphery.
Since the concave groove 6 is formed in such a shape that a is long and the lower edge 6b is short and protrudes, the concave groove 6 on the peripheral edge of the seat plate 5 is formed.
The engagement state between the seat plate 5 and the pipe frame 7 in the seat load direction is sufficiently maintained, and the strength of the fit between the seat plate 5 and the pipe frame 7 is improved. In addition, the seat plate 5 itself has elasticity so that it expands and contracts, and the lower edge 6b of the groove 6 is short, so that the groove 6 is connected to the pipe frame 7.
Since the opening width is wide, the concave groove 6 on the periphery of the seat plate 5 is
The work of fitting the pipe frame 7 to the pipe frame 7 can be easily performed.

Effects of the invention The present invention is a chair constructed by attaching a seat plate to a frame made of a pipe. A groove with a long upper edge and a short protruding lower edge is formed on the periphery of the seat plate, and a pipe frame surrounding the periphery of the seat plate is tightly fitted into this groove. The concave groove on the periphery of the plate and the pipe frame are fully engaged with each other in the direction of the seat load, improving the strength of the fit between the seat plate and the frame, and preventing damage during use.
In addition to being highly durable,
The seat plate itself has elasticity so that it expands and contracts, and the lower edge of the groove is shortened to widen the opening width of the groove relative to the pipe frame. The effect that the fitting operation can be easily performed is obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway perspective view of the entire chair, Fig. 2 is an enlarged sectional view of a part, and Fig. 3 shows another embodiment. It is a partial sectional view. 1... Frame made of a pipe, 2... Frame main body, 3... Support body, 4, 4... Bending arm,
5...Seat plate, 6...Concave groove, 6a...Upper edge thereof, 6
b... lower edge thereof, 7... pipe frame, 8, 9
...Pin, 10... Back board.

Claims (1)

[Scope of utility model registration request] In a chair constructed by attaching a seat plate to a frame made of a pipe, the seat plate is blow-molded from thermoplastic to form a flat plate with a hollow double wall structure, and an upper edge is attached to the periphery of the seat plate. The chair is characterized by forming a concave groove with a long bottom edge and a short protruding lower edge, and a pipe frame surrounding the periphery of the seat plate is tightly fitted into the concave groove.