HYDRAULIC AND MECHANICAL CENTRALISER WITH CHANGEABLE GEOMETRY OF ALIGNING ELEMENTS Russian patent published in 2015 - IPC E21B17/10 

FIELD: mining.

SUBSTANCE: centraliser contains a reducer, an upper housing with hydraulic channels for flushing liquid, a bushing, lock fingers, fixing dies, springs for back and forth motion of lock fingers, bolts, a lower housing with hydraulic channels for flushing liquid and a cylinder guiding a piston pusher, seals, bolts, a hole for connection of an internal cavity of the centraliser with the cylinder cavity, a shoe.

EFFECT: exception of spontaneous switching of aligning elements - dies from transport position into working position during pulling-and-running operations.

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