B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
255/44, 138/40.1
B25D 9/12 (2006.01) E21C 3/00 (1980.01)
Patent
CA 1045939
ABSTRACT A machine having a housing wherein are arranged a ham- mer piston adapted for reciprocation in said housing to effect forward and return stroked, and a stepped pressure difference ring valve fitted over the hammer piston and also reciprocating in said housing. A tool rotation mechanism kinematically linked with a gear mounted on an anvil has at least one twin hydraulic cylinder comprised of two different diameter cylinders loca- ted at the front portion of the machine. The twin hydraulic cylinder is divided by a lateral partition and accomodates 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, the return one. Adjacent the ring valve having an outer annular groove, the machine hou- sing is provided with three inner annular grooves with pas- sages, of which the front groove, as in the direction of dril- ling, is continuously in communication with the atmosphere, the middle groove is continuously in communication with the larger diameter chamber, and the rear one, 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 communicate in such a manner that recipercations of the ring valve causes the pusher piston to effect the forward and return strokes thereby kinematically interacting via the pawl with the gear during the return stroke of the hammer piston.
240942
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