Variable timing for front chamber of pneumatic hammer
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United States of America Patent
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Apr 26, 2005
Grant Date -
N/A
app pub date -
Jun 15, 2004
filing date -
Jun 15, 2004
priority date (Note) -
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Abstract
The lower end portion of a pneumatic impact hammer cylinder has at least one upper fluid passage and at least one lower fluid passage. A U-shaped sleeve is mounted in a circumferential groove in the lower end portion of the piston. The sleeve includes a base, upper and lower legs extending radially outward from the base, and a cavity extending axially between the legs. The sleeve has an axial length that is less than the axial length of the piston groove such that the sleeve is slidably movable within the piston groove between an upstroke position and a downstroke position. The upper fluid passage and the lower fluid passage cooperate with the sleeve cavity, as the piston reciprocates between the impact position and the recovery position, to supply pressure fluid to the impact end of the operating chamber for a portion of each upstroke and each downstroke. The portion of each downstroke during which pressure fluid is supplied to the impact end of the operating chamber is less than the portion of each upstroke during which pressure fluid is supplied to the impact end of the operating chamber.
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