Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1997-01-30
2000-04-04
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
249 91, 2642711, 264276, 264278, 425117, 425127, B29C 4412
Patent
active
060457317
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns a member for integrally forming a foam material such as urethane; specifically, it concerns a guide member for adhesively fixing a fastening part to a urethane molding.
BACKGROUND ART
Cushion material in which the covering material is put onto urethane is generally used in seats in automobiles and other vehicles and aircraft, in chairs for home or office use, or in door linings or interior appointments. The urethane and covering material are usually put together detachably using a fastening part that is fixed to a urethane molding.
In order to provide fastening parts on the urethane surface inexpensively and stably, the integral forming of urethane and fastening parts has been implemented. In the prior art, the fastening parts are previously covered so that the liquid foaming raw materials do not adhere to the surface of the fastening parts, then the liquid foaming raw material is flowed in, and thereafter portions to which the material is attached are cut away.
With the conventional method, in order to prevent the liquid foaming raw material from adhering to the fastening surface, it has been necessary to pre-manufacture guide members which are the same length as each fastening part and fit into a urethane metal mold. That is, the guide member must be remade for each desired length of fastening part, which causes an increase in the fabrication time and cost. In addition, additional equipment is needed for each fastening part to prevent the liquid foaming raw material from flowing onto the fastening surface, which results in increasing of the cost and the number of operating processes. Another drawback of the conventional method is that because the fastening part has a relatively low peeling strength, the covering material of the cushion material easily peels off.
Thus the purpose of the invention is to provide a novel guide member that reduces cost and the number of processes.
Another purpose of the invention is to provide a novel guide member that effectively cuts off the seepage of liquid foaming raw material onto the fastening surface.
A further purpose of the invention is to provide an integral molding method that improves the peeling strength of the fastening part.
DISCLOSURE OF THE INVENTION
In order to achieve the above purposes, the invention comprises the following means.
According to the invention, the guide member for forming the fastening part integrally with the urethane molding has a longitudinally extended body that has a concave cross-section and at least one open end. The surface of its inner walls contact with side surfaces of said fastening part to prevent the flow of liquid foaming raw material to the fastening surface.
In addition, to prevent said liquid foaming raw material from seeping into the fastening surface of the interior of said guide member, said guide member may also include at least one isolation member near at least one of its ends. The isolation member is provided such that it engages with the fastening surface of said fastening part.
Moreover, the height of the inner wall of the guide member of the invention may be formed so that it is higher than the height of the fastening parts.
The isolation member is preferably a detachable thin plate made of spring material, and said guide member is preferably made of aluminum or aluminum alloy.
The method of the invention for integrally forming a fastening part with the urethane mold, comprises the steps of: outwardly from at least one end of said guide member; time.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A is a preferred embodiment of the guide member of the invention shown in perspective and show in an elevational cross-sectional view in the longitudinal direction in FIG. 1B taken substantially along the line 1B--1B of FIG. 1A.
FIG. 2A shows the fastening part of the invention;
FIG. 2B is a fragmentary perspective view of the fastening part positioned in relation to the guide member of FIG. 1A;
FIG. 2C is a fragmentary sectional view taken substantially along the line 2C--2C of
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Kuhns Allan R.
Namba Press Works Co. Ltd.
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