Title:
Automatic overhead door
Document Type and Number:
United States Patent 2568808

Inventors:
Johanson, Karl E.
Publication Date:
09/25/1951
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Assignee:
Johanson, Karl E.
Primary Class:
160/189
Other Classes:
477/15, 477/203, 49/28, 49/140
International Classes:
E05F15/16; E05F15/00
US Patent References:
1102921
1378146Electrically-controlled transmission
1384464
1405640Electrically-controlled transmission
1471454Apparatus for raising and lowering materials
1472864Automatic electric window guard
1651985Actuating apparatus for theater curtains
1745990Automatic stopping and reversal of electromechanically-operated doors and the like
1897391Rolling door mechanism
1972695Automatic closure control
2000515Door operating device
2056174Automatic closure operating device
2070058Operator for roll top doors
2099191Sliding door
2253170Door operating mechanism
2315571Electrically operated garage door
2335336Door opening and actuating mechanism
2378262Door or like operating device


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