Drill boom with hydraulic parallel motion means

Details Drill boom with hydraulic parallel motion means Drill boom with hydraulic parallel motion means

1977-07-25

1979-06-19

Schwadron, Martin P.

Tool driving or impacting

Automatic control of power operated means

91531, 91534, E21B 1500, F15B 1122, F15B 1301

Patent

active

041583930

ABSTRACT:
In a drill boom pivotally supporting a rock drilling apparatus, hydraulic parallel motion means is provided which includes a hydraulic pilot cylinder for sensing the setting of the elevation angle of the drill boom. During elevating of the drill boom the hydraulic pilot cylinder is furthermore used as an additional elevating cylinder.

REFERENCES:
patent: 4037671 (1977-07-01), Kimber et al.

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