Variable speed mechanism

Machine element or mechanism – Gearing – Interchangeably locked

Patent

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Details

74333, 74372, F16H 308

Patent

active

055602509

ABSTRACT:
A variable speed mechanism includes a drive shaft, a plurality of drive gears each fixedly mounted around the drive shaft, a plurality of driven gears each respectively meshing with a corresponding one of the drive gears, a plurality of single direction needle bearings each fixedly mounted in a corresponding one of the plurality of driven gears, a driven shaft mounted in the plurality of single direction needle bearings, an elongated sleeve slidably mounted around the driven shaft, the elongated sleeve being slidable on the driven shaft between a first position where an enlarged free end thereof is fitted into a corresponding one of the single direction needle bearings such that the elongated sleeve is rotated by the associated driven gear, thereby rotating the driven shaft therewith, and a second position where the enlarged free end thereof is not in contact with any one of the single direction needle bearings such that the elongated sleeve and the driven gear stop rotating, a rack slidably mounted in parallel with the elongated sleeve and including a cross arm formed on a distal end thereof and pivotally engaged with one free end of the elongated sleeve, and an actuating gear capable of moving the rack whose cross arm in turn drives the elongated sleeve to slide on the driven shaft.

REFERENCES:
patent: 1872861 (1932-08-01), Wise
patent: 2698545 (1955-01-01), Pethybridge
patent: 3354739 (1967-11-01), Ivanchich
patent: 3889547 (1975-06-01), Sun et al.
patent: 4713983 (1987-12-01), Rundle
patent: 5400671 (1995-03-01), Hall et al.

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