Tool driving or impacting – Drive controlled by relative axial movement of tool
Patent
1995-11-30
1997-10-28
Smith, Scott A.
Tool driving or impacting
Drive controlled by relative axial movement of tool
173 73, 173 78, 173 80, 173 91, 173112, 173206, 175296, 91269, E21B 414
Patent
active
056809042
ABSTRACT:
A hydraulic reciprocating percussion tool, particularly adapted for drilling applications, comprises an elongated cylinder, opposed fronthead and backhead members and a central bore in the cylinder for supporting a reciprocating piston hammer. The piston hammer has reduced diameter end portions which have respective tubular sleeve valves disposed in sleeved relationship thereon and engageable with valve retainer members on the reduced diameter portions for effecting movement of the valves with the piston hammer. The head members include tubular sleevelike stem portions which cooperate with the respective valves to valve pressure fluid to and from opposed chambers in the cylinder to effect repeated impact blow delivering strokes to a shank member disposed in a chuck connected to the fronthead. The sleeve valve disposed between the piston hammer and the fronthead operates to vent pressure fluid from the forward chamber and the sleeve valve disposed between the piston hammer and the backhead effects valving of pressure fluid to both opposed chambers in the drill. The provision of the opposed sleeve valves and a central passage in the hammer for conducting pressure fluid to the forward end of the drill provides for a reduced diameter cylinder for slim hole and in-the-hole drilling operations.
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Martin Michael E.
Smith Scott A.
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