Percussive drilling apparatus

Details Percussive drilling apparatus Percussive drilling apparatus

1978-03-06

1979-09-04

Staab, Lawrence J.

Tool driving or impacting

Impacting devices

With means for rotating tool

173116, 173118, 173131, 173139, B25D 900

Patent

active

041665074

ABSTRACT:
A hydraulic rotary percussive drill which is adapted to operate as a drill for installing rock bolts in mines is described. The drill is configured so that the shank (which holds the drill steel and bit) forms a right angle with the impact mechanism, thereby reducing the height of the drill and providing longer lengths of drill steel feed in a confined environment. A hydraulic spring force coupler transfers the impact energy from the impact mechanism to the shank, steel and bit and shapes the energy so as to provide force pulses of such length as to couple efficiently the percussive energy to the rock being drilled while reducing the strain in the steel and bit. A rotation mechanism may be mounted in the same leg of the right angle as the shank, steel and bit to rotate the steel and bit independently from the percussive action.

REFERENCES:
patent: 1857624 (1932-05-01), Degenhardt et al.
patent: 2260268 (1941-10-01), Warren et al.
patent: 2373972 (1945-04-01), Moreno
patent: 2388877 (1945-11-01), Souter
patent: 3250335 (1966-05-01), Joelson
patent: 3547208 (1970-12-01), Swain et al.
patent: 3570609 (1971-03-01), Wise
patent: 3596562 (1971-08-01), Foster et al.

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