US 5,131,778 A · Coupling structure and method of resin moldings

Abstract

A coupling structure and a method of coupling resin structures wherein a first member is coupled with a thermoplastic second member through a coupling force produced by constricting the volume of the resin during molding and/or the generation of an undercut structure. The undercut structure results from the deformation of a projection member caused by the flow pressure and temperature of the resin. A recess is provided in one of the members. The recess is indented in the laying direction. On the other member, a projection is provided which enters the recess. The coupling of the two members is therefore simple and does not require the use of a subsidiary material. Additionally, when an undercut structure is formed, extremely strong coupling is obtained. Since the undercut is formed by deformation of the projection, no undercut structure is required to be formed on the die, so that no extra cost or burden has to be forced on the die.

Claims34

Dependent claims

A coupling structure of resin molding members including first and second members having, respectively, first and second plate portions, said coupling structure, in a cross-sectional view, comprising:

a first projection projected from an end of said first plate portion in a direction along a direction of said first plate portion;
a first hook portion projected from said first projection in a direction transverse to the direction of said plate portion, thereby providing a first recess between the end of said first plate portion and said first hook portion;
a second projection projected from an end of said second plate portion in a direction along a direction of said second plate portion;
and
a second hook portion projected from said second projection in a direction transverse to the direction of said plate portion, thereby providing a second recess between the end of said second plate portion and said second hook portion;
wherein said first hook portion is fitted into said second recess and said second hook portion is fitted into said first recess.

3 more elements

A coupling structure of resin molding members including first and second members, said first member having a first plate portion, said coupling structure, in a cross-sectional view, comprising:

a first projection projected from one end of said first plate portion in a direction along a direction of said first plate portion;
a first hook portion projected from said first projection in a direction transverse to the direction of said first plate portion;
a second hook portion projected from said first hook portion toward said one end of said first plate portion, thereby providing a first L-shaped recess among said first plate portion, said first projection, said first hook portion, and said second hook portion;
a second projection projected from another end of said first plate portion in a direction along a direction of said first plate portion;
a third hook portion projected from said second projection in a direction transverse to the direction of said first plate portion;
a fourth hook portion projected from said third hook portion toward said another end of said first plate portion, thereby providing a second L-shaped recess among said first plate portion, said second projection, said third hook portion, and said fourth hook portion;
and
the second member having a first complementary portion which fills said first L-shaped recess and a second complementary portion which fills said second L-shaped recess.

5 more elements

A coupling structure of resin molding members including first and second members having, respectively, first and second plate portions, said coupling structure, in a cross-sectional view, comprising:

a first projection projected from one end of said first plate portion in a direction along a direction of said first plate portion;
a first hook portion projected from said first projection in a direction transverse to the direction of said first plate portion, thereby providing a first recess between the one end of said first plate portion and said first hook portion;
a second hook portion projected from said first projection in a direction transverse to the direction of said first plate portion, thereby providing a second recess between said first hook portion and said second hook portion;
a second projection projected from another end of said first plate portion in a direction along the direction of said first plate portion;
a third hook portion projected from said second projection in a direction transverse to the direction of said first plate portion, thereby providing a third recess between the other end of said first plate portion and said third hook portion;
a fourth hook portion projected from said second projection in a direction transverse to the direction of said first plate portion, thereby providing a fourth recess between said third hook portion and said fourth hook portion;
a first complementary portion provided in said second member which fills said first recess;
a second complementary portion provided in said second member which fills said second recess;
a third complementary portion provided in said second member which fills said third recess;
and
a fourth complementary portion provided in said second member which fills said fourth recess.

8 more elements

Dependencies are inferred from the claim text.

Coupling structure and method of resin moldings

Life of this patent

Coupling structure and method of resin moldings

Life of this patent

Abstract

Claims34