Drill steel

Details Drill steel Drill steel

1992-07-13

1994-08-16

Neuder, William P.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

E21B 1700

Patent

active

053378423

ABSTRACT:
A drill steel is provided for use in percussive drilling. The drill steel has an elongate body for transmitting energy between a drill rig and a drill bit, and each end of the drill steel has an end coupling portion. The body has a means for reducing vibrations at the end coupling portions comprising a twisted portion between the two ends. The twisted portion transmits less vibration than untwisted drill steel of corresponding size under the same conditions. The twisted portion also promotes bending in the drill steel in at least two or more places. The twisted portion may have a helical pitch of between one half turn over the length of the drill steel and two turns per foot. The twist may be of uniform or variable pitch, or a combination thereof.

REFERENCES:
patent: 2533227 (1950-12-01), Delaney
patent: 2733943 (1956-02-01), Nater
patent: 3117471 (1964-01-01), O'Connell et al.
patent: 3421351 (1969-01-01), Newman et al.
patent: 3555935 (1971-01-01), Dorrenberg
patent: 4171634 (1979-10-01), Perkins
patent: 4898503 (1990-02-01), Barish
patent: 4945999 (1990-08-01), Malzahn
PCT International Search Report and Annex to the International Application No. PCT/CA91/00412.

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