Closed loop hydraulic drill feed system

Details Closed loop hydraulic drill feed system Closed loop hydraulic drill feed system

1989-09-08

1990-09-04

Capossela, Ronald C.

Boring or penetrating the earth

With above-ground means to advance or retract boring means

60468, 60475, 60476, E21B 1908

Patent

active

049536397

ABSTRACT:
A closed loop hydraulic system for use in a rotary drilling apparatus includes an extendible-retractable feed cylinder and a valve for biasing the feed cylinder. A variable, reversible displacement pump is provided for pumping fluid from either of the first and second pump ports, including pumping fluid to the feed cylinder. A reservoir retains a supply of fluid for the system. A check valve is provided for supplying additional fluid to the pump in response to the feed cylinder being extended. An overcenter valve is connected to each of the first and second ports for controlling flow from the system in response to pressures received from the first and second ports when the feed cylinder is extended and retracted.

REFERENCES:
patent: 2153056 (1939-04-01), West
patent: 2457467 (1948-12-01), Hartman
patent: 2582556 (1952-01-01), Morey
patent: 3183668 (1965-05-01), Johnson et al.
patent: 3747351 (1973-07-01), Wilkerson et al.
patent: 3864911 (1975-02-01), Gellatly et al.
patent: 4438628 (1984-03-01), Creamer

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