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Individual
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Priority to ES0079900UpriorityCriticalpatent/ES79900Y/en
Publication of ES79900UpublicationCriticalpatent/ES79900U/en
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Publication of ES79900YpublicationCriticalpatent/ES79900Y/en
New extensible mandrel made on a conical axis longitudinally furrowed by three symmetrically spaced grooves, characterized by being composed of three rules of external stepped profile adaptable by sliding to said grooves of the shaft and provided at its head with a flange at a right angle; a threaded external surface nut and with an inner opening sliding on the shaft, comprising the flanges of the three rulers together with a circular bushing; several screws that join this bushing with the aforementioned sliding nut; springs included in said bushing to support the rules against the repeated axis; an elastic washer included in a corresponding circular groove of the shaft externally to the said sliding nut, and a large knurled external surface nut and double internal thread, one of these threads which is screwed into the larger diameter end of the shaft and the other that is screw in the thread of the external surface of the said sliding nut. (Machine-translation by Google Translate, not legally binding)