Chucks or sockets – With fluid-pressure actuator – Socket type
Patent
1975-02-18
1976-11-16
Simpson, Othell M.
Chucks or sockets
With fluid-pressure actuator
Socket type
279 57, 279 74, 279121, B23B 3130, B23B 3116
Patent
active
039920194
ABSTRACT:
Core sampling drill head having powered drill chuck with jaws to grip drill rod. Head has thrust member movable by chuck actuating means between jaws retracted and jaws extended position, and precompressed chuck springs cooperating with thrust member and drill chuck so as to be movable with thrust member. Thrust member is located by releasable locking means in desired position, which means also relieve drill bearings of reaction from chuck springs. When thrust member is in jaws retracted position, chuck springs are precompressed by tension means and relatively large diameter tools can pass drill chuck. When thrust member is in jaws extended position, chuck springs cooperate with chuck, are further compressed and extend jaws to grip rod, and tension means are relieved of load from chuck springs. By precompressing and moving springs by themselves, worn drill rods can be accommodated in relatively short drill head without loss of grip. Also, with hydraulically controlled chuck actuating means, when chuck jaws are gripping rod loss of hydraulic fluid pressure does not result in loss of grip on rod as chuck springs are independent of fluid pressure. DRILL HEAD WITH LOCKING CHUCK
REFERENCES:
patent: 3292939 (1966-10-01), Lorenz
patent: 3434337 (1969-03-01), Goeke
patent: 3451314 (1969-06-01), Smrekar
patent: 3533636 (1970-10-01), Firestone et al.
patent: 3692320 (1972-09-01), Lindelof et al.
patent: 3792869 (1974-02-01), Braun
Briggs W. R.
Canadian Mine Services Ltd.
Simpson Othell M.
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