Machine element or mechanism – Gearing – Rotary bodies
291592, 74449, F16H 5518
An anti-backlash twin gear formed by a pair of identical half-gears, each fabricated by stamping a metal sheet to create a toothed wheel provided with a diametrical spoke having a central mounting bore. The arched area between one side of the spoke and one half section of the wheel is fully excised to form an open region, whereas the arched area between the opposite side of the spoke and the other half section of the wheel is contour-cut to define a C-shaped flat spring whose foot is integral with the spoke. The spring is offset from the plane of the wheel whereby when the pair of half-gears are juxtaposed, the untensioned spring of each half gear is received within the open region of the other and the free end of the spring abuts the edge of the spoke flanking this region to effect a slight angular displacement of the half-gear. When the twin gear is intermeshed with a driving pinion engaging both half gears thereof, the springs are then tensioned to cause the half-gears to exert pressure on opposite tooth flanks of the pinion, thereby avoiding lost motion.
patent: 1197261 (1916-09-01), Burke
patent: 1539149 (1925-05-01), Thornburg
patent: 1647480 (1927-11-01), Starkey
patent: 2061684 (1936-11-01), Spence, Jr.
patent: 2206831 (1940-07-01), Berthelsen
patent: 2845809 (1958-08-01), Hetzel
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patent: 2966806 (1961-01-01), Luning
patent: 3127784 (1964-04-01), O'Neill
patent: 3296881 (1967-01-01), Seabeck
patent: 3357273 (1967-12-01), Larson et al.
patent: 3359819 (1967-12-01), Veillette et al.
patent: 3385126 (1968-05-01), Finch
patent: 3407727 (1968-10-01), Fischer
patent: 3535948 (1970-10-01), Winzeler et al.
Product Engineering Catalog, "18 Ways to Control Backlash in Gearing," Oct. 26, 1959.
Bulova Watch Company, Inc.
Husar C. J.
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