Porting system for back chamber of pneumatic hammer

Details Porting system for back chamber of pneumatic hammer Porting system for back chamber of pneumatic hammer

1998-01-27

1999-11-16

Vo, Peter

Tool driving or impacting

Impacting devices

173 17, 173 73, 173 78, 173115, B23Q 533

Patent

active

059840218

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.

REFERENCES:
patent: 2979033 (1961-04-01), Bassinger
patent: 3193024 (1965-07-01), Cleary
patent: 3229775 (1966-01-01), Cleary
patent: 3924690 (1975-12-01), Shaw
patent: 4312412 (1982-01-01), Pillow
patent: 4333537 (1982-06-01), Harris et al.
patent: 4530408 (1985-07-01), Toutant
patent: 4932483 (1990-06-01), Rear
patent: 5205363 (1993-04-01), Pascale
patent: 5350023 (1994-09-01), Klemm
patent: 5419403 (1995-05-01), Klemm

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