PULLER Russian patent published in 2019 - IPC B25B27/18 

FIELD: machine building.

SUBSTANCE: invention relates to pullers for extraction of hollow part with broken thread part. Puller comprises bushing made coaxially with cylindrical recess and provided with engagement elements, and tie rod having, at one end, outer thread with nut, and on other end - conical section located opposite cylindrical sample of bushing. Engagement elements are made with possibility of contact with conical section. Tie-rod is made with possibility of axial movement inside bushing. Bushing is made with a smooth outer side wall and with four longitudinal slots made from the end of the sleeve facing the conical section of the rod, and engagement elements are made in form of dies for engagement with inner wall of extracted part, which are installed in longitudinal slots with possibility of longitudinal and radial movement. On the outer wall of the slots there is a transverse groove, wherein in the longitudinal slots a rubber ring is installed, which presses the dies to the tie-rod, and a check-nut is screwed onto the threaded end of the tie-rod.

EFFECT: technical result consists in expansion of technical capabilities of puller.

1 cl, 3 dwg