Releasing device in core barrel grapplers

Handling: hand and hoist-line implements – Grapple – Well type

Patent

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Details

166125, 294 8622, E21B 3112

Patent

active

044312253

ABSTRACT:
A device for disengaging a grappling device from a core barrel, which are lowered in an engaged or connected state into a hollow drill rod, is actuated by a recess made in the drill rod bore, when the barrel approaches or assumes a working position in the drill rod, and is thereby displaced by a spring for disengaging the mechanism connecting the grappling device and barrel.

REFERENCES:
patent: 2948340 (1960-08-01), Bostock et al.
patent: 2980185 (1961-04-01), Daffin
patent: 3537743 (1970-11-01), Martinsen
patent: 3701389 (1972-10-01), Egnelov

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