Process for making a foam plastic resin encased roller

Details Process for making a foam plastic resin encased roller Process for making a foam plastic resin encased roller

1974-05-31

1976-08-31

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 469, 264271, 264275, 308 20, B29D 2704

Patent

active

039781810

ABSTRACT:
A method of making a unitary structure, such as, a conveyor idler, having a heat-sensitive subassembly with at least one moving part therein, such as, a lifetime lubricated bearing structure, wherein the subassembly is preassembled, the preassembled subassembly is placed in a mold, and a plastic, having a sufficiently low temperature of formation to prevent damage to the heat-sensitive subassembly and, upon hardening, a sufficient compressive strength to hold the subassembly together and form a pressure resistant unitary body, such as, a hard polyurethane foam having a compressive strength of at least about 90 kp/mm.sup.2, is formed about the subassembly. A protective covering, such as, a plastic sleeve, resistant to abrasion, can also be placed in the mold and made to adhere to and surround the outside surface of the unitary plastic body during the formation of the unitary plastic body.

REFERENCES:
patent: 1418152 (1922-05-01), Logan
patent: 2873392 (1959-10-01), Rich
patent: 2979779 (1961-04-01), Staak
patent: 3264382 (1966-08-01), Angell et al.
patent: 3267484 (1966-08-01), Roedder
patent: 3318569 (1967-05-01), Manor
patent: 3400408 (1968-09-01), Garcia
patent: 3732606 (1973-05-01), Germond
Dupont Bulletin, Engineering Design with Dupont Plastics, Section: "Design Corner," Wilmington, Del., E. I. Du Pont de Nemours & Co., Inc., Summer 1973, pp. 1, 3, 14 and 15.

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