Overhead door operator

Details Overhead door operator Overhead door operator

1977-05-05

1978-07-25

Caun, Peter M.

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

With mounting or supporting means

160193, E05F 1500, E05F 1508

Patent

active

041023820

ABSTRACT:
An operator for an overhead door comprises a fluid actuated device including a cylinder and a cooperating piston. The piston rod carries a pair of cable sheaves. Another pair of sheaves are rotatable on a fixed mounting. A cable is wound around pulleys in corresponding pairs. Each cable has one end anchored and another end fastened to the door so when the fluid actuated devices spread the pair of sheaves, the door lifts. Pressurized fluid is relieved from the cylinder to let the door close under its own weight. Electric circuits for actuating the hydraulic circuit are shown.

REFERENCES:
patent: 2221216 (1940-11-01), Greegor et al.
patent: 2625390 (1953-01-01), McFadden
patent: 2634124 (1953-04-01), Davis
patent: 2703235 (1955-03-01), Reamey
patent: 2736553 (1956-02-01), Brown
patent: 2772010 (1956-11-01), Buehring
patent: 2943886 (1960-07-01), Wilkinson
patent: 3185528 (1965-05-01), Peterson
patent: 3537503 (1970-11-01), Simmonds

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