Variable timing for front chamber of pneumatic hammer

Details Variable timing for front chamber of pneumatic hammer Variable timing for front chamber of pneumatic hammer

2005-04-26

2005-04-26

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

Selective axial direction of impact

C173S017000, C173S136000, C175S296000

Reexamination Certificate

active

06883618

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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