| 摘要 |
A pneumatic linerbolt removing tool including a moil supported for reciproca l movement along a hammer axis within a housing, an inertial body movably mounted along said hammer axis, and a piston assembly moveable within said 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 said piston toward the moil a nd air supply means to a cylinder adapted to urge a biasing piston on the inertial body relative to the housing and toward said moil. The inertial bod y 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 mea ns for equalizing pressure between the front and rear faces of the piston, to continuously allow transfer of air between said faces while in operation.</S DOAB>
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