Telescopic bar of drill rig

Details Telescopic bar of drill rig Telescopic bar of drill rig

1991-04-01

1993-02-09

Bui, Thuy M.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

F21B 400

Patent

active

051846888

ABSTRACT:
A telesciopic bar of drill rig for drilling in general, where the telescopic sections (10, 11, 12) consist of concentric, substantially cylindrical pipes, each of them equipped with longitudinal internal (16,17) and external (13,14) toothed ribs arranged in such a way that the external rib of each pipe and the internal one of the external pipe are engaged when the bar is being rotated to lock the telescopic sections in position, and released when the bar is being rotated in the opposite direction to lift and withdraw the bar sections.

REFERENCES:
patent: 3987856 (1976-10-01), Carl et al.
patent: 4463815 (1984-08-01), Jurgens et al.
patent: 4494615 (1985-01-01), Jones

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