Rotary pull down pull up drive for drill pipes

Details Rotary pull down pull up drive for drill pipes Rotary pull down pull up drive for drill pipes

1982-06-21

1984-02-07

Schmidt, Frederick R.

Tool driving or impacting

Advance causing or controlling means

Tool advances relative to drive

173165, 414431, 414745, 74840, E21C 110

Patent

active

044297530

ABSTRACT:
A gear drive used in water well drilling or blast hole drilling to remove overburden in open pit coal mining, not only rotates the drill pipe but also pulls down or pulls out the drill pipe as it rotates. A hydraulic motor within a housing operates a first gear train to rotate an output shaft at varying speeds. A drill pipe is projected through the output shaft. A plurality of feed rollers are mounted on spherical bearings, the outside diameter of the rollers having a concave recess for operative registry with the drill pipe. When the output shaft is rotated, each roller cocks and digs into the feed pipe causing it to rotate with the output shaft. The pull down and pull up section is driven by a hydraulic motor within the housing through a second gear train. The second gear train drives a plurality of third gear trains for individually driving the respective feed rollers.

REFERENCES:
patent: 403086 (1889-05-01), Blessley
patent: 2316117 (1943-04-01), Tilley
patent: 3307725 (1967-03-01), Fecto
patent: 4128133 (1978-12-01), Hug
patent: 4262756 (1981-04-01), Blanz

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