Door operator
United States Patent 2899021

Inventors:
O'grady, Joseph V.
Publication Date:
08/11/1959
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Assignee:
ELEVATOR SUPPLIES COMPANY INC
Primary Class:
187/319
Other Classes:
187/316
International Classes:
B66B13/12; B66B13/02
US Patent References:
1937029Elevator door operating mechanism
2077659Door operating mechanism
2174524Door
2235380Elevator door operator
2235381Door operating system for elevators
2432293Elevator car door control mechanism
2481124Door-operating mechanism for lift doors and the like
2502995Door operating mechanism
2618912Stone polishing machine