Rotary drill with a kelly bar and hydraulic chuck

Details Rotary drill with a kelly bar and hydraulic chuck Rotary drill with a kelly bar and hydraulic chuck

1980-10-22

1983-07-19

Whitehead, Harold D.

Tool driving or impacting

Means to drive tool about an axis

Means to hold and relatively rotate sections of tool shaft

173152, 175122, 279121, E21B 304

Patent

active

043939457

ABSTRACT:
In a rotary drill having a driven rotary table with an axially directed passage through its center of rotation defined by a hollow spindle, a kelly bar, with annular shoulders, extending through the passage and a chuck mounted on the spindle, plungers are mounted for radial movement in the chuck, into and out of engagement with the annular shoulders on the kelly bar, and fingers are mounted to be moved hydraulically axially to engage the plungers and move them radially.

REFERENCES:
patent: 1812721 (1931-06-01), Sheldon
patent: 2564119 (1951-08-01), Mathews
patent: 2768830 (1956-10-01), Janson
patent: 2854240 (1958-09-01), Parker et al.
patent: 3561545 (1971-02-01), Rassieur
patent: 4196914 (1980-04-01), Kutman et al.

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