Hydraulic drilling machine

Details Hydraulic drilling machine Hydraulic drilling machine

1976-07-19

1977-12-27

Hafer, Robert

Tool driving or impacting

Advance causing or controlling means

Tool advances relative to drive

173 8, 173 9, B23Q 5027

Patent

active

040649504

ABSTRACT:
A hydraulic drilling machine for cutting into rock formations and the like. The machine has a rotating drill rod with a bit at one end and a rotary hydraulic drive motor at the other end. The drill rod is supported on a carriage adapted for linear travel to advance the rotating bit into the rock formation. The carriage is extended and retracted by means of a hydraulic feed motor. The rotary hydraulic motor and the hydraulic feed motor are connected in series in the hydraulic operating system so that when rotation resistance increases accompanied by a greater pressure drop across the rotary hydraulic motor, there is a consequent decrease in the force exerted by the hydraulic feed motor in order to avoid jamming of the drill bit.

REFERENCES:
patent: 3189103 (1965-06-01), Attebo et al.
patent: 3409089 (1968-11-01), Meyer
patent: 3581830 (1971-06-01), Stoner
patent: 3802514 (1974-04-01), Ein et al.

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