Hydraulic rock drill with stroke responsive advance

Details Hydraulic rock drill with stroke responsive advance Hydraulic rock drill with stroke responsive advance

1974-10-07

1976-03-23

Purser, Ernest R.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

91171, E21C 510

Patent

active

039454428

ABSTRACT:
A rock drill having a control valve hydraulically operable to effect feed of oil from a bulk reservoir alternately to opposite ends of a power piston carrying a drill string to reciprocate the piston; having a motor for rotating the piston as the latter reciprocates; having a snubber for absorbing shocks in the event of piston override; and having carriage means automatically and hydraulically operable during reciprocation of the piston to feed the tool along a guide channel relative to the work.

REFERENCES:
patent: 689516 (1901-12-01), Rattek
patent: 2228338 (1941-01-01), Bennett
patent: 3747694 (1973-07-01), Kollandsrud
patent: 3774502 (1973-11-01), Arndt

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