Device to control the locking of a boring corer

Details Device to control the locking of a boring corer Device to control the locking of a boring corer

1988-03-29

1989-05-23

Novosad, Stephen J.

Boring or penetrating the earth

With means movable relative to tool to receive, retain, or...

Receiver removable through below-ground tool shaft

175243, 175317, E21B 2502, E21B 3410

Patent

active

048321389

ABSTRACT:
To control the locking of a cable boring corer (1), a control device (30) is used, comprising a deflecting casing (33), a sleeve (31) and a piston (32), which are movable in relation to the deflecting casing (33). The piston (32) is able to be rendered integral in a lower position, under hydraulic pressure, with the sleeve (31) by a finger (43). When the hydraulic pressure is released, the sleeve (31), which is integral with the piston (32), is brought into an upper position which allows the circulation of a boring liquid through the deflecting casing (33) towards a boring crown (4).

REFERENCES:
patent: 2491682 (1949-12-01), Muhlbach
patent: 3266835 (1966-08-01), Hall et al.
patent: 3340939 (1967-09-01), Lindelof
patent: 4187919 (1980-02-01), Lambot
patent: 4418770 (1983-12-01), Lambot
patent: 4452321 (1984-06-01), Eriksson

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