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Individual
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Individual
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Priority to ES0046792UpriorityCriticalpatent/ES46792U/en
Publication of ES46792UpublicationCriticalpatent/ES46792U/en
An improved screw, characterized in that the threaded thread that presents the same, is interrupted by helical grooves so that the screw itself carves the thread in the piece in which it has to be fixed, which is done in the own The operation of screwing it into a drill that has previously been performed on the piece, whose helical grooves have the mission of eliminating the obstruction that would represent the surplus material derived from the indicated operation. (Machine-translation by Google Translate, not legally binding)
ES0046792U1955-03-071955-03-07A perfected screw (Machine-translation by Google Translate, not legally binding)
PendingES46792U
(en)