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Patent: Model Airplane Engine Starter [Cox]

Patent: Model Airplane Engine Starter [Cox] - cover thumbnail  

"It is comprised of a simple, cylindrical connector member which can be mounted upon the propeller shaft and a simple helically wound wire spring, one end of which is anchored to a stationary part of the engine and the other end of which has a hook element which bears against the hub member."

Patent: Model Airplane Engine Starter [Cox]
US No. 4,440,122
Roger D. Theobald
April  1984
Patent, 5 pages

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About this title

Application for patent filed February 16 1982; patent granted April 3 1984.

"The invention provides a simple and inexpensive device for application to a model internal-combustion engine which is unusually light weight, has maximum crash proof features and characteristics, will automatically engage the propeller when the latter is rotated in a contra-normal direction, and will preclude the engine from running in reverse."

Theobald assigned his rights in this invention to Cox Hobbies Inc., the world famous model engine manufacturer. The company was named after the founder, Leroy (Roy) M. Cox (1906-1981). Cox started L.M. Cox Manufacturing Co. Inc. in 1945. Read more about Roy Cox and his work at the AMA Model Aviation Hall of Fame webpage www.modelaircraft.org/museum.

The Cox company has had various names (and owners) over the years: it became Cox Hobbies Inc. in 1976, Cox Products in 1993, and Cox Models in 1996. In 2009, Estes Industries stopped producing Cox engines and sold their remaining inventory to several private buyers. Cox International, one of the new owners, has a website and online store coxengines.ca.

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Patent: Model Airplane Engine Starter [Cox]
Submission date: 18/08/2016
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