Patent ID: 8628148
Filing Date: 2014-01-14
Classification: E21C,Y10T

Abstract:
1. An assembly comprising: a holder block, a sleeve, and a piston; the holder block comprising a first hole extending along an axis, a wall surrounding the first hole, a piston channel, and a bore in fluid communication with the piston channel, the first hole to receive the sleeve; the sleeve comprising a shank and a second hole for receiving a cutter bit, the shank receivable in the first hole of the holder block; the sleeve and the holder block each comprising a peripheral surface facing the other of the sleeve and the holder block when the holder block receives the sleeve; the piston channel having an opening in the peripheral surface of the holder block, the piston channel extending axially inwardly from the opening into the holder block to an end of the piston channel; the piston in the piston channel, the piston axially movable in the piston channel; the bore in fluid communication with the end of the piston channel wherein when a source of pressurized hydraulic fluid is applied to the end of the piston channel through the bore, the fluid pressure urges the piston away from the end of the piston channel.