Door operator

Details Door operator Door operator

1990-05-10

1991-05-28

Kannan, Philip C.

Movable or removable closures

With operator for movably mounted closure

Operating lever or link and closure swing about parallel axes

49 26, E05F 1510

Patent

active

050183044

ABSTRACT:
An operator for moving a door between an open position and a closed position. The operator includes linkage for being attached to the door; a motor assembly having a drive shaft; and a drive train for coupling the drive shaft of the motor assembly to the linkage structure, the drive train includes a clutch for selectively disconnecting the linkage from the drive shaft of the motor assembly and a variable torque control assembly for varying the torque produced by the clutch.

REFERENCES:
patent: 581972 (1897-05-01), Wright
patent: 1544901 (1925-07-01), Griffin
patent: 2757327 (1956-07-01), Oliver
patent: 2843376 (1958-07-01), Osuch et al.
patent: 3237932 (1966-03-01), Catlett
patent: 3284950 (1966-11-01), Gute
patent: 3874117 (1975-04-01), Boehm
patent: 4289995 (1981-09-01), Sorber et al.
patent: 4599824 (1986-07-01), Mitsuhashi et al.
patent: 4750295 (1988-06-01), Court et al.
patent: 4782628 (1988-11-01), Gaddis
1 page entitled "Swing-Door", Richards Wilcox Catalog A-210 R6 (1961), p. 14.

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