Method and apparatus for controlling a rotary percussive hydraul

Details Method and apparatus for controlling a rotary percussive hydraul Method and apparatus for controlling a rotary percussive hydraul

1983-05-27

1985-05-14

Garrett, Robert E.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

One path includes restriction

91 6, 91513, 91516, 173 2, 60421, 60486, F15B 1309

Patent

active

045164673

ABSTRACT:
A quick changeover hydraulic circuit for use in an auger drive mode or percussion hammer mode, controllable in each mode by the same flow regulator. The circuit comprises a first branch circuit which powers a first auxiliary hydraulic powered device and a hydraulic motor for drill steel rotation. A second branch circuit powers a hydraulic percussion motor for a drill steel hammer or a rotary hydraulic motor for an auger, only one of which is in the circuit at one time. An interbranch circuit comprises a priority flow divider which distributes flow. In a first mode with the percussion motor for the drill steel hammer connected into the second branch the flow is delivered to the steel rotation motor and the first auxiliary device. In a second mode with the auger motor connected into the second branch, combined flow from both branches is delivered to the auger motor.

REFERENCES:
patent: T986004 (1979-09-01), Stroup et al.
patent: 3408901 (1968-11-01), Inhofer
patent: 3865013 (1975-02-01), Mastaj
patent: 3910369 (1975-10-01), Chichester et al.
patent: 3916767 (1975-11-01), Barton
patent: 3979944 (1976-09-01), Salmi et al.
patent: 3987623 (1976-10-01), Bianchetta
patent: 4070858 (1978-01-01), Hand
patent: 4308787 (1982-01-01), Parquet et al.
patent: 4430926 (1984-02-01), Wallace

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