PROTECTIVE BUSHING FIXATION MECHANISM Russian patent published in 2019 - IPC E21B33/00 

FIELD: locking mechanisms.

SUBSTANCE: invention relates to locking mechanisms ensuring fixation of protective sleeves inside the conductor column and extraction of underwater column heads system from column. Mechanism of fixation of bush protective for fixation of bushing protective inside column of conductor with possibility of its extraction, containing: a cylindrical collet including lobes and a mounting portion and installed on the outer side of the protective sleeve with the possibility of limiting collet movement along the protective sleeve longitudinal axis; support ring installed on side of collet end and entering second recess on outer side of protective sleeve; collet is made with possibility of its blades engagement with column of conductor, as well as with possibility of its lobes entering into third cavity in protective sleeve during its movement in case of load application to protective sleeve for its extraction.

EFFECT: high reliability of fixation with reliability and simplification of extraction of protective sleeve.

4 cl, 4 dwg