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Individual
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Priority to ES1974208915UpriorityCriticalpatent/ES208915Y/en
Publication of ES208915UpublicationCriticalpatent/ES208915U/en
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Publication of ES208915YpublicationCriticalpatent/ES208915Y/en
Improved drill, of the tubular structure type and cooled by a circulating liquid internally, essentially characterized by the provision of an axial internal rod that is arranged with the possibility of sliding in its same direction and alternately inside the drill, forming its head, located inside the central assembly body in the drill chuck, a widening as a vessel, receiving a second larger diameter rod, to which environment a helical spring is arranged tending to keep both rods in position introduced with respect to the drill and the end of the first emerging through the mouth of the latter, the head of the spring being retained by means of a threaded nut at the end of the central body, whose central hole allows the alternative sliding of the head of the second rod. (Machine-translation by Google Translate, not legally binding)