Speed changing unit construction

Details Speed changing unit construction Speed changing unit construction

1978-08-21

1980-09-16

Dorner, Kenneth

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Pulley or guide roll has eccentric mount for shifting or...

248534, 46 78, 244 54, F16H 710

Patent

active

042222800

ABSTRACT:
A speed changing unit preferably for use on a model aircraft or powered foot-launched aircraft. A usual engine is mounted on a frame which in turn is adapted to be mounted on the frame of an aircraft. A pair of pulleys are mounted on the frame in a spaced relationship with a drive belt drivingly interconnecting the pulleys. One of the pulleys is mounted on the drive shaft of the engine for positive rotation with the drive shaft. The other pulley is rotatably mounted on a stationary eccentric shaft which is adjustably mounted on the frame. A propeller is mounted directly on this other pulley for rotation therewith when driven by the engine drive shaft and belt. Manual rotation of the eccentric shaft within its mounting adjusts the spacing between the spaced pulleys permitting different size drive shaft pulleys to be used with a standard drive belt to achieve different propeller speeds and thrust characteristics for a particular aircraft.

REFERENCES:
patent: 891697 (1908-06-01), Huff
patent: 1323490 (1919-12-01), Putnam
patent: 1393990 (1921-10-01), Ford
patent: 1549845 (1925-08-01), Munz
patent: 2436504 (1948-02-01), Duncklee
patent: 2618163 (1952-11-01), Russell
patent: 4011670 (1977-03-01), Hutchings et al.
patent: 4108401 (1978-08-01), Sullivan
patent: 4138901 (1979-02-01), Fortin et al.

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