Automatic feed and rotational speed control system of a hydrauli

Details Automatic feed and rotational speed control system of a hydrauli Automatic feed and rotational speed control system of a hydrauli

1978-12-08

1981-06-09

Mackey, Robert

Tool driving or impacting

Advance causing or controlling means

Motor causes or controls advance

173 8, 60719, E21B 300, E21C 500

Patent

active

042719143

ABSTRACT:
A needle valve placed in series with the hydraulic drill feed motor, and responsive to fluid flow in the hydrualic system subject to the operation of a pressure relief valve therein, causes the thrust to increase and the feed rate to decrease as the drill enters a difficult drilling material, a proportional flow divider interposed between the pressurized hydraulic fluid source and the hydraulic drill rotation motor and the hydraulic feed motor splits the flow and maintains a fixed proportion between the flows to the two motors to cause the rotational motor to slow down as the feed motor slows down. A pressure compensated flow control valve bypassing the proportional flow divider to the drill rotation motor insures a fixed amount of fluid flow to the rotational motor regardless of the difficulty of material being drilled to maintain a minimal rotational speed of the drill rotation motor.

REFERENCES:
patent: 1761310 (1930-06-01), Osgood
patent: 2320874 (1943-06-01), Lehmann
patent: 2594098 (1952-04-01), Vanderzee
patent: 2693084 (1954-11-01), Badger
patent: 2804751 (1957-09-01), Schroeder
patent: 3189103 (1965-06-01), Attebo et al.
patent: 3385376 (1968-05-01), Hobhouse
patent: 3593807 (1971-07-01), Klima
patent: 3802514 (1974-04-01), Gin et al.
patent: 3823784 (1974-07-01), Feucht
patent: 4064950 (1977-12-01), Salmi et al.
Fluid Controls, Inc. Catalog, Mentor, Ohio, Dec. 1974, pp. 9.01-9.04.

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