The process of chiseling a rope with a non-free-falling tool that turns by hand is slow. The rope is greatly deteriorated and shortened by frequent extension and winding on spiders. The slowness of chiselling with such a tool, due to a non-free and weak blow, is further increased by the fact that it is necessary to build up the rope, wind and unwind it with each descent and ascent of the tool from the spider and, finally, replace from time to time the rope consisting of pieces with a solid one. All these shortcomings are eliminated if the tool itself is reset, giving a strong blow, and turns automatically, regardless of the rope, because in this case there is no need to separate the working part from the spare part and wind the rope around the spiders.
