Door opener

Details Door opener Door opener

1985-08-30

1987-04-28

Kannan, Philip C.

Movable or removable closures

With operator for movably mounted closure

Operating lever or link and closure swing about parallel axes

49139, E05F 1124

Patent

active

046603247

ABSTRACT:
A door opener is secured to a door jamb on the hinge side. A radius arm extends from a vertical-axis shaft, and overlies the door. Force is transferred to the door by a roller mounted at the outer end of the arm on an axis parallel to the shaft.

REFERENCES:
patent: 2591693 (1952-04-01), Gatesy
patent: 2639142 (1953-05-01), Morgan et al.
patent: 2900791 (1959-08-01), Kinsey, Jr.
patent: 2947534 (1960-08-01), Leimer et al.
patent: 3284950 (1966-11-01), Gute
patent: 3314195 (1967-04-01), Ziegler
patent: 3874117 (1975-04-01), Boehm
patent: 4253276 (1981-03-01), Peterson et al.
patent: 4348835 (1982-09-01), Jones et al.

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