Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1975-12-08
1976-10-19
Purser, Ernest R.
Tool driving or impacting
Impacting devices
With means for rotating tool
173137, 91189, 91303, E21C 300
Patent
active
039865673
ABSTRACT:
A machine having a housing wherein are arranged a hammer piston adapted for reciprocation in said housing to effect forward and return strokes and a stepped pressure difference ring valve fitted over the hammer piston and also reciprocating in said housing. A tool rotation mechanism is linked kinematically with a gear arranged on an anvil and has at least one twin hydraulic cylinder comprised of two different diameter cylinders and located at the front portion of the machine. The twin hydraulic cylinder is divided by a lateral partition and accommodates a pusher piston which carries a spring-loaded pawl and forms with the partition and the different diameter cylinder barrels two chambers, the smaller diameter chamber being the pressure one, the larger diameter chamber being the return chamber. At the point of location of the ring valve having an outer annular groove, the machine housing is provided with three inner annular grooves with passages of which the front groove as in the direction of drilling, constantly communicates with the atmosphere, the middle groove constantly communicates with the larger diameter chamber and the rear groove communicates with the lower diameter chamber of the twin hydraulic cylinder and with the pressure pipeline. The above grooves of the housing and the chambers of the twin hydraulic cylinder are so interconnected that reciprocations of the ring valve cause the pusher piston to effect the forward and return strokes thus kinematically interacting via the pawl with the gear during a return stroke of the hammer piston.
REFERENCES:
patent: 2457969 (1949-01-01), Anderson
patent: 2734488 (1956-02-01), Wampach
patent: 3141384 (1964-07-01), Hoffman
patent: 3587753 (1971-06-01), Feucht
Favreau Richard E.
Purser Ernest R.
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