Chucks or sockets – With fluid-pressure actuator – Socket type
Patent
1987-10-23
1989-07-04
Abrams, Neil
Chucks or sockets
With fluid-pressure actuator
Socket type
188 67, 279121, B23B 3116
Patent
active
048444898
ABSTRACT:
A chuck apparatus including a plurality of radially movable jaws for gripping a drill rod, each jaw being moved radially by an axially movable bowl, each jaw and the corresponding bowl surfaces are provided with two sets of camming surfaces, the first set of camming surface being oriented with a steeper angle than the second set of camming surfaces. In operation, as the bowl moves relative to the jaws with the respective first set of camming surfaces of the jaws and the bowl in contact, the jaw gripping force is relaxed and the jaws release the drill rod. As the bowl and jaws continue to move they transition to interact at their respective second set of camming surfaces whereupon, because the shallow angle of interface, the jaws are moved through a greater distance than if the first set of camming surfaces' steeper angle of interface were employed. As a result, more clearance is provided for freeing the drill rod.
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patent: 3076245 (1963-02-01), Acker
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patent: 4273200 (1981-06-01), Lambot
Acker, III William L.
Hryhorcoff Dan
Powell Gary T.
Abrams Neil
Acker Drill Co.
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