AXIAL EXTENSION BY MEANS OF THREE CAM CLUTCHES FOR CREATION OF GRIPPING TOOL WITH IMPROVED OPERATING RANGE AND LIFTING CAPACITY Russian patent published in 2012 - IPC E21B19/07 E21B19/16 

FIELD: machine building.

SUBSTANCE: invention refers to tubular products gripping and manipulation tool. Gripping tool has gripping surface that is borne against movable gripping elements and control mechanisms for radial movement of the gripping surface from retracted to extended position. Gripping tool includes control mechanisms comprising at least one control mechanism with three cam clutches, which in its turn includes drive cam clutch receiving the input rotation and tending to the rotation transfer; intermediate cam clutch receiving the input rotation only from drive cam clutch; driven cam clutch receiving the input rotation only from intermediate cam clutch; drive cam pair acting between drive cam clutch and intermediate cam clutch so that input rotation is transmitted by drive cam pair from drive cam clutch to intermediate cam clutch, and driven cam pair acting between intermediate cam clutch and driven cam clutch so that input rotation from intermediate cam clutch is transferred by driven cam pair to driven cam clutch.

EFFECT: providing the control of axial and radial movements of gripping tool surface.

10 cl, 13 dwg