Hydraulic percussion drill

Details Hydraulic percussion drill Hydraulic percussion drill

1978-05-09

1980-04-08

Staab, Lawrence J.

Tool driving or impacting

Impacting devices

Length of cyclic travel of hammer head selectively adjustable

173DIG4, 91277, B25D 900, F01L 3100

Patent

active

041967801

ABSTRACT:
A percussion drill comprising a cylinder housing, a striker piston slidably accommodated within said housing, a shank rod slidably mounted within said housing, said shank rod being adapted to be struck by said striker piston, a first chamber having a small sectional area continuously pressurized by hydraulic fluid for retracting said striker piston, a second chamber having a large sectional area intermittently pressurized by hydraulic fluid for advancing said striker piston, a selector valve mounted in said housing, said selector valve being connected with said first and second chambers, and a bushing adjustably mounted in said housing around the periphery of said striker piston so as to form a pilot operated valve between said bushing and the periphery of said piston.

REFERENCES:
patent: 1219932 (1917-03-01), Frost
patent: 3032013 (1962-05-01), Vincent
patent: 3185040 (1965-05-01), Ligon
patent: 3701386 (1972-10-01), Feucht
patent: 3995700 (1976-12-01), Mayer et al.
patent: 4016941 (1977-04-01), Sanders
patent: 4062411 (1977-12-01), Adkins et al.

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