Hand Winch That Counts the Tubes and Locks Lifting Until the Guying Is Confirmed

Abstract

The invention relates to a hand winch (1) that raises the column of mast systems extended by adding tubes from below and counts the added tubes by itself. A travelling nut (10) on a counter screw (9) turning with the drum (3) follows the length of rope wound on the drum. At the end of each lifting stroke the travelling nut (10) reaches its end position and advances a counter wheel (12) by one step; the number of tubes is seen in a window in the winch body. Preferably, an upper stop (11) ends the winding here so that the lifting plate cannot be pulled into the head. When the counter wheel (12) reaches a preset number at which guys must be attached, a locking pawl (13) locks the winding; lifting does not continue until the guys are attached and the confirm button (15) is pressed. Preferably, the handle turns the drum through a spring-loaded helical cam (17), and a load indicator (16) shows the load on the rope together with the load allowed at that number of tubes.

The official text is Turkish; the English title and abstract are our translation.