Porting system for back chamber of pneumatic hammer
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United States of America Patent
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-
Nov 16, 1999
Grant Date -
N/A
app pub date -
Jan 27, 1998
filing date -
Jan 27, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic downhole impact drill has a porting system for automatically supplying pneumatic pressure fluid from a fluid delivery tube received within an axial bore in the impact piston to the opposite ends of the piston operating cylinder as the piston reciprocates. A flange on the delivery tube is slidably mounted in a cavity in a mounting hub assembly. Passageways provide fluid communication between the pressure fluid inlet plenum and the operating chamber side of the cavity and between the back chamber and the inlet plenum side of the cavity. Fluid pressure forces acting on the opposite faces of the flange and on the top end surface of the delivery tube reciprocate the delivery tube between upstroke and downstroke positions. Positioning the delivery tube in the upstroke position increases the axial distance that the piston must travel before the pressure fluid supply is connected to the back end of the operating chamber on the piston upstroke. Positioning the delivery tube in the downstroke position increases the axial distance the piston must travel before the pressure fluid supply is disconnected from the back end of the operating chamber on the piston downstroke.
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