Device for automatic rotation during the fall of a free-falling drilling tool

Abstract

The process of chiseling on a rope with a non-free-falling tool rotated by hand is slow. The rope greatly deteriorates and shortens due to frequent splicing and winding onto the 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 splice 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 self-dropping, delivering a strong blow, and rotates 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 onto the spiders.

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