EXTENSION-TYPE WELL TOOL Russian patent published in 2012 - IPC E21B10/32 

FIELD: mining.

SUBSTANCE: extension-type well tool (10) includes housing (2), working component (8), spindle (1), spline rack (7) and at least one first guide block (5) connected to spindle (1) for movement together with it. At that, working component is installed on housing (2) for movement relative to it between non-working and working positions. Spindle is installed with possibility of axial movement in housing (2). Spline rack is installed in cavity (11) made in housing (2) and forms the first linear guide passing parallel to spindle (1) movement axis and the second outward passing guide. Guide block is installed so that it can slide along spline rack (7) for movement along the first linear guide. At that, working component (8) is installed on spline rack (7) for movement along the second outward passing guide. At that, at least one guide block (5) is capable of being engaged with working component (8) at movement of spindle (1) from the first axial position to the second axial position for movement of working component (8) from retracted position to extended position.

EFFECT: higher reliability of the device.

14 cl, 25 dwg