Process of making plastic hinge for raceway

Details Process of making plastic hinge for raceway Process of making plastic hinge for raceway

1987-01-06

1988-09-06

Van Balen, William J.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Removing surface portion of composite workpiece to expose...

264145, 428126, 428167, 428192, 428217, B28B 1116, B32B 302, B32B 3100

Patent

active

047691999

ABSTRACT:
A U-shaped raceway having bottom and side walls formed as substantially rigid plastic panels, and flexible plastic hinges integrally joined between the lower edges of the side walls and the adjacent edges of the bottom wall. The plastic hinges are soft and flexible, and of substantially less hardness than the walls. The plastic hinges extend across the thickness of the walls. The raceway is formed as a dual extrusion so that the hinges are integrally joined to the rigid walls. During the extruding step, a rigid bridge structure is also extruded so as to span transversely across the hinge outwardly from one of the surfaces of the panels to maintain dimensional stability across the hinge. The bridge structure is severed from the panels following the extrusion operation.

REFERENCES:
patent: 3634182 (1972-01-01), Biglin et al.
patent: 4157413 (1979-06-01), Ruhl
patent: 4209043 (1980-06-01), Menzel
patent: 4277123 (1981-07-01), Haworth et al.
patent: 4391303 (1983-07-01), Holgersson
patent: 4463046 (1984-07-01), Hutchison et al.
patent: 4596098 (1986-06-01), Finkbeiner et al.

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