JPH0242202Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a chair with a simple structure consisting of a seat base and legs.

Several types of chairs have been used in the past, with a simple structure in which metal rod-shaped legs are attached to a flat seat. This type of chair is forced to have a structure in which the load is concentrated at the attachment point between the base and the legs, and conventional chairs of this type have drawbacks such as the attachment points between the seat and the legs becoming loose and being extremely susceptible to damage. It's hot.

In view of the above-mentioned drawbacks of the conventional products, the present invention aims to strengthen the attachment part between the seat base and the legs without complicating the structure, and provides a chair with high strength and excellent durability. It is something to do.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure of a chair according to the present invention shown in the drawings will be described below.

In the drawing, 1 is a seat and 2 is four legs, and the seat 1 and legs 2 constitute a chair. The seat 1 is made of thermoplastic plastic by blow molding to form a flat plate with a hollow double wall structure, for example, a circular plate. Radial grooves 3 are formed in four matching directions, and fittings 4 for the legs 2 are integrally inserted into each radial end of the grooves 3 during blow molding. Mounting bracket 4
This is a so-called self-tapping metal fitting, in which a thread is formed by attaching a threaded bolt, and a hole 5 is pre-drilled. A small circular weld portion 6 is formed at a suitable position within the groove 3 of the base 1, and an arcuate weld portion 7 is also formed at a portion sandwiched between the radial grooves 3. The weld parts 6 and 7 are
A recess is formed on the back side for reinforcement, and this is joined to the seat side. The four legs 2 are integrally constructed by crossing their mounting parts and welding the joint parts 8, and the mounting parts of the legs 2 are provided with mounting screw holes 9.

To attach the legs 2 to the base 1, fit the mounting part of the legs 2 into the groove 3 of the base 1, screw the set screw from the mounting screw hole 9 into the threaded hole 5 of the mounting bracket 4, and then attach the leg 2 to the base 1. When the legs 2 are fixed to the base 1, the legs 2 are fitted and supported in the grooves 3 on the back side of the base 1, and are securely and firmly attached. That is, the mounting portion of the integrated leg 2 is fitted and supported in the radial groove 3 formed on the back side of the seat 1, and is fixed with a set screw, so that the seat 1 and the leg are fixed. The attachment part with 2 is significantly strengthened.

Note that as the thermoplastic plastic constituting the seat 1, polyethylene, polypropylene, vinyl chloride, polyamide, polystyrene, ABS resin, etc. are used. Leg 2 is made of metal.

As is clear from the above description, the chair according to the present invention is composed of a seat and legs, and the seat has a hollow double-walled structure made of extremely strong and durable thermoplastic resin. The cushioning properties as a seat body are the best, and since the mounting surface of the concave groove 3 for attaching the legs is the same concave curved surface as the outer peripheral surface of the leg, the attachment part of the leg body fits tightly into the concave groove 3. In addition, between the concave grooves, there is an arc-shaped reinforcing weld part 6 having the same shape as the outer periphery of the seat base, so that the inner and lower surfaces of the seat base have the same shape as the outer rim. The reinforcing frame is in the same state as the interior, and is extremely strong.The leg attachment points of the seat base, which have traditionally been considered to be the most vulnerable to external forces in this type of chair base, are sufficiently reinforced, and the The structure is such that the stress that is strongly applied to the seat is dispersed to each part, and the weld part for attaching the leg rod is particularly thick and is connected to the seat surface side in a substantially conical shape, so that part of the seat is deformed. The chair has a structure that resists external pressure with the entire structure of the chair, without the load being concentrated only on the screw attachment part, and this does not mean that the structure is complicated in any way. Even though it is not suitable for mass production at a low price, it is an excellent idea because it does not impair the functions of a chair with a simple structure.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is an overall perspective view, Figure 2 is a back view of the base,
FIG. 3 is an enlarged side view with the same part cut away, and FIG. 4 is a perspective view of the legs. 1...Seat, 2...Legs, 3...Concave groove, 4...Mounting bracket, 6, 7...Weld part, 8...Joint part,
9...Mounting screw hole.

Claims (1)

[Scope of utility model registration request] In a chair constructed by attaching legs 2 formed by bending metal pipes to the underside of a seat 1 made of thermoplastic plastic and formed into a hollow disc shape by blow molding, the back side of the seat 1 is blow molded. At the same time, radial grooves 3 are formed in four directions from the center at angles of 90 degrees each, and inside the grooves 3 there is a small circular reinforcing weld part 6 that reaches the back side of the seat surface and joins, and a mounting bracket for the legs 2. 4 are integrally formed, and a reinforcing weld part 7 having an arc shape along the outer periphery of the base is arranged at the part sandwiched between the grooves 3 arranged in a radial shape, and the weld part is formed as a whole. A chair characterized by being formed into a ring shape.