Impact drilling tool having improved valving

Details Impact drilling tool having improved valving Impact drilling tool having improved valving

1980-10-28

1982-06-08

Reynolds, Wm. Carter

Tool driving or impacting

Drive controlled by relative axial movement of tool

Drive motor controlled

173 78, 173 80, 91234, B25D 912, F01L 2102

Patent

active

043335373

ABSTRACT:
The device described contains a pneumatically operated hammer, a feeder controlling the flow of pneumatic fluid, an anvil which is struck repeatedly by the hammer, a drill bit attached to or integral with the lower end of the anvil, and an outer casing. The device is typically used as a down hole tool in rotary drilling operations and normally utilizes pressurized air as its pneumatic fluid. The pneumatic fluid first lifts the hammer above the anvil and second pushes the hammer downward to impact against the anvil in a striking movement. Simultaneous with striking, the pneumatic fluid above the hammer is expelled through an exhauster retained in the anvil and out through the drill bit where it is utilized to transport the cuttings from the hole being drilled. The feeder operates in conjunction with the hammer to control pressurization above and below the hammer, while exhaust above the hammer is controlled by the lower end of said feeder tube.

REFERENCES:
patent: 2887989 (1959-05-01), Dulaney
patent: 3040710 (1962-06-01), Wilder
patent: 3896886 (1975-07-01), Roscoe, Jr.
patent: 3964551 (1976-06-01), Bassinger
patent: 4015662 (1977-04-01), Cochran
patent: 4054180 (1977-10-01), Bassinger
patent: 4209070 (1980-06-01), Sudnishnikov et al.
patent: 4248133 (1981-02-01), Petukhov et al.

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