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Priority to ES89978UpriorityCriticalpatent/ES89978Y/en
Publication of ES89978UpublicationCriticalpatent/ES89978U/en
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Publication of ES89978YpublicationCriticalpatent/ES89978Y/en
Improved free piston, for bicycles and the like, characterized in that it comprises a ring or outer gear ring, an inner ring, with internal thread, customizable bicycles, a conventional number of balls and another conventional number of rollers, said ring being external toothing provided with one or more channels that, in its inner part, serve as a track to the balls that stabilize and center both rings, while the inner ring is grooved externally to form the track for said rollers, these rollers being housed between the balls at convenient distances. (Machine-translation by Google Translate, not legally binding)
ES89978U1961-11-201961-11-20
Improved freewheel for bicycles and the like
ExpiredES89978Y
(en)