ASSEMBLY COMPRISING A SECURITY APPARATUS EQUIPPING A LIFTING DEVICE, IN PARTICULAR A WINCH, AND SYSTEM FOR ACTUATING SAID APPARATUS

摘要

This assembly includes a security apparatus equipping a lifting device, in particular a winch, and a system for actuating the apparatus The security apparatus includes a toothed wheel, wedged on the shaft of the lifting device, and a worm meshing with the toothed wheel. The assembly also includes: a splined shaft secured to one end of the worm; a pocketed wheel with inner and outer splines, engaged on the splined shaft; an elastic member between the pocketed wheel and a stop piece; a drive wheel with a splined hub, with which the pocketed wheel is capable of engaging rotationally; and a back-up motor, capable of rotating the drive wheel.

主权项

1. An assembly comprising a security apparatus equipping a lifting device, in particular a winch, and a system for actuating said apparatus; the security apparatus comprises a toothed wheel, wedged on the shaft of the lifting device, a worm meshing with said toothed wheel, a housing slidingly receiving the worm, a follow-up motor for allowing the worm to be rotated so that the latter part follows the rotation of the toothed wheel during normal operation of the lifting device, and a device for damping the sliding of the worm in the housing in the case of an exceptional failure situation of the lifting device, up to a stop position of this worm in this housing;
wherein said assembly further comprises: a splined shaft secured to one end of the worm and axially extending said worm; a pocketed wheel with inner and outer splines, slidingly engaged on the splined shaft and rotationally engaged therewith; an elastic member whereof one end is connected to a stop piece secured to the splined shaft and whereof the other end is connected to the pocketed wheel; a drive wheel with a splined hub, with which the pocketed wheel is capable of engaging rotationally owing to the outer splines comprised by said pocketed wheel; a back-up motor for rotating the drive wheel, the pocketed wheel moves with said splined shaft between a normal disengaged position, which it occupies outside a failure situation of the lifting device, and in which it is not engaged with the drive wheel, and an exceptional engaged position, which it occupies in a failure situation of the lifting device, and in which it is rotationally engaged with the drive wheel and thus rotationally connects the drive wheel with the splined shaft and therefore with the worm.