Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent
1981-07-09
1983-08-30
Watson, Robert C.
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
173 57, 173115, 91 50, 91325, E21B 102
Patent
active
044011687
ABSTRACT:
There is disclosed an impact applying mechanism, particularly as applied in a subterranean drilling apparatus, and comprising a cylinder (13) arranged with its axis substantially vertical and connected to the member to which impact is to be applied, a piston (5) slidably mounted within the cylinder (13), means to admit pressure fluid to the cylinder (13) below the piston (5), at least one valve tube (24), slidably mounted in the base of the cylinder (13), coil springs (30) to bias the upper end of the valve tubes (24) into sealing engagement with the underside of the piston (5) when the piston is in its lowest position, a flange (26) on the upper end of the valve tubes (24) upon which fluid pressure in the cylinder (13) acts to produce a force urging the end of the valve tubes (24) into contact with the underside of the piston (5), and further coil springs (32) to provide a force to said valve tubes (24) of a magnitude which increases as the piston (5) moves upwardly relative to the cylinder (13) to subsequently urge the ends of the valve tubes (24) out of contact with the underside of the piston (5). Nuts (28) are also provided to enable the force exerted by the further coil springs (32) to be adjusted to vary the stroke of the piston (5) by varying the point at which the seal between the valve tubes (24) and the underside of the piston (5) is broken and the pressure is released from the cylinder (13) through the valve tubes (24
REFERENCES:
patent: 2041690 (1936-05-01), Baumeister et al.
patent: 2169675 (1939-08-01), Bays
patent: 2258001 (1941-10-01), Chamberlain
patent: 2786451 (1957-03-01), Dulaney
patent: 2813516 (1957-11-01), Dulaney
patent: 3259196 (1966-07-01), Hawthorne
patent: 3691907 (1972-09-01), Paschke
Conzinc Riotinto Malaysia Sendirian Berhard
Olszewski Robert P.
Watson Robert C.
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