Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Reexamination Certificate
2005-06-14
2005-06-14
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
C173S206000, C173S128000, C173S212000
Reexamination Certificate
active
06904980
ABSTRACT:
A pneumatic linerbolt removing tool including a moil supported for reciprocal movement along a hammer axis within a housing, an inertial body movably mounted along the hammer axis, and a piston assembly moveable within the inertial body along the hammer axis between a striking position at which it strikes the moil and a retracted position remote therefrom. The tool further including a gas-charged accumulator for urging the piston toward the moil and air supply to a cylinder adapted to urge a biasing piston on the inertial body relative to the housing and toward the moil. The inertial body being ported so that working air is supplied to a front face of the piston assembly to urge it to a coked position away from the moil and whereby the accumulator is in its compressed state, and selectively operable porting for equalizing pressure between the front and rear faces of the piston, to continuously allow transfer of air between the faces while in operation.
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Hedman & Costigan ,P.C.
RME Holdings Pty Limited
Smith Scott A.
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