Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1984-05-18
1985-06-25
Levy, Stuart S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254337, B66D 148, B66D 136
Patent
active
045249520
ABSTRACT:
A safety system for an oil well type derrick that has a crown block and a traveling block and drawworks for raising and lowering the traveling block. It uses electrical sensing means to detect the presence of the traveling block, and it has electronic circuits to control an actuator for braking the drawworks in order to prevent the traveling block from contacting the crown block.
REFERENCES:
patent: 2241274 (1941-05-01), Severson
patent: 2564457 (1951-08-01), Wilson
patent: 2581721 (1952-01-01), Sherwood
patent: 3565402 (1971-02-01), Linke
Lankford, Jr. Frank L.
Rome Gerald F.
Dearborn Henry C.
Jaekel Katherine
Kulason Robert A.
Levy Stuart S.
O'Loughlin James J.
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