Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1977-10-03
1979-11-06
Gilden, Leon
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29132, 29414, 295274, 29DIG47, 425113, B21H 114
Patent
active
041730585
ABSTRACT:
In a method for manufacturing photographic film processing rollers useful in processing self-processable type film units, an adhesive priming composition is first applied to the surface of a cylindrical metal rod of given length. The rod is then pushed through a cross-head extrusion die to deposit a melted polymer comprising an elastomeric urethane resin on its surface to provide the rod's surface with a thin coating whose coefficient of friction is greater than that of the metal. The extruded coating is then hardened, and then the rod is cut into roller segments each having a predetermined length. Afterwards, each roller segment is centerless ground to provide it with journals at its opposite ends and to reduce the thickness of the polymeric coating intermediate the journals to provide a film-contacting traction coating of predetermined thickness and smoothness.
REFERENCES:
patent: 1990937 (1935-02-01), Forbes
patent: 3139826 (1964-07-01), Rainwater
patent: 3859017 (1975-01-01), Meudec
patent: 3941635 (1976-03-01), Tovelle et al.
patent: 3971115 (1976-07-01), Schneide
Caufield Francis J.
Gilden Leon
Polaroid Corporation
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