Counterweight door structure

Details Counterweight door structure Counterweight door structure

1983-11-16

1985-05-14

Kannan, Philip C.

Movable or removable closures

With means mounting closure for swinging

With biasing means

E05F 100

Patent

active

045163545

ABSTRACT:
A counterweight door structure includes a door having a pair of upwardly extending arms for supporting counterweights at positions in spaced relation above the top edge of the door. The door is mounted for pivotal movement about a generally horizontal axis positioned closely adjacent the top edge of the door and the top edge of the door opening. The counterweight support arms are laterally spaced apart by a distance greater than the width of the building adjacent the door pivot axis to provide swinging clearance for the support arms when the door is pivoted upwardly 90.degree..

REFERENCES:
patent: 1187635 (1916-06-01), McCormack
patent: 2664597 (1954-01-01), McKee
patent: 2718036 (1955-09-01), Strobel
patent: 2854707 (1958-10-01), Hieatt
patent: 2863181 (1958-12-01), Josephson
patent: 3175761 (1965-03-01), Moore
patent: 3421260 (1969-01-01), Dickinson
patent: 4014133 (1977-03-01), Brown
patent: 4165897 (1979-08-01), Schmidt
patent: 4334389 (1982-06-01), Visser

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