Hammer drill

Details Hammer drill Hammer drill

1983-06-06

1986-04-22

Schran, Donald R.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

173 15, E21B 100

Patent

active

045836019

ABSTRACT:
A "hole bottom" hammer drill comprising a tubular body (1) supplied with compressed air, a drill bit (3) and a percussion piston (38) caused to move in an inner cylinder (7) by a mechanism distributing compressed air alternately below and above the piston.
The hammer drill includes a device (29) for injecting gas oil into the chamber (71) above the piston (38) and a mechanism (34, 35) for triggering the injection during the upward stroke of the piston (38); the additional compression effects the combustion of the air-gas oil mixture, thus projecting the piston (38) towards the drill bit (3).

REFERENCES:
patent: 2052459 (1936-08-01), Geiser
patent: 2396627 (1946-03-01), Wohlmeyer
patent: 2559364 (1951-06-01), Mashinter
patent: 2875737 (1959-03-01), Ueckert
patent: 2948122 (1960-08-01), Smith
patent: 2950705 (1960-08-01), Kuhn
patent: 3640350 (1972-02-01), Stenuick

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