Hydraulic drilling outfit

Details Hydraulic drilling outfit Hydraulic drilling outfit

1990-10-26

1992-04-28

Yost, Frank T.

Tool driving or impacting

Processes

173 39, 173 77, 173 79, 173161, E21C 510

Patent

active

051079330

ABSTRACT:
A hydraulic drilling outfit has a hydraulically driven hammer drill which is fastened pivotally to a hydraulic thrust unit. A control for the hydraulics utilizes the flushing water for the drill bit as the power-source for all of the motions executed by the drilling outfit. One hydraulic supply line to the control of the thrust unit and one line from the control to the hammer drill are sufficient for operating the system in an open circuit. A rotary slide valve simultaneously controls the thrust and withdrawal motions as well as the operational states of drilling and not drilling. The desired value adjustment for the speed of thrust is arranged on the rotary slide valve.

REFERENCES:
patent: 1164496 (1915-12-01), Gilman
patent: 2599042 (1952-06-01), Bannister
patent: 2908482 (1959-10-01), Curtis et al.
patent: 2964305 (1960-12-01), Samhammer et al.
patent: 3132703 (1964-05-01), Larcen
patent: 3203489 (1965-08-01), Fuehrer
patent: 4010806 (1977-03-01), Broadbent
patent: 4024923 (1977-05-01), Broadbent
patent: 4712624 (1987-12-01), Mashimo

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