US Patent: 1,215,071 - Unloading-Valve for Compressors


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US Patent: 1,215,071

Unloading-Valve for Compressors

Patentee:

George F. Steedman (exact or similar names) - St. Louis, MO

USPTO Classifications:

137/115.16, 417/299, 417/302

Tool Categories:

industrial machines : pneumatic : air compressors : compressor relief valves

Assignees:

Curtis & Co. Mfg. Co. - Wellston, MO

Manufacturer:

Curtis Pneumatic Machinery Co. - St. Louis, MO

Curtis & Co. Mfg. Co. - St. Louis, MO

Witnesses:

J. F. D. Howell

L. L. Buckles

Patent Dates:
Applied:	Jan. 29, 1916
Granted:	Feb. 06, 1917

Patent Pictures:

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Vintage Machinery entry for Curtis & Co. Manufacturing Co.

Description:

A full-page ad from Curtis Pneumatic Machinery Co., in the 1926-01-07 Motor Age, page 184, features their shop air compressors and mentions their "Patented Centrifugal Unloader, consisting of a compression control release, operated by a speed governor built in the fly wheel. If the motor slows down or stops for any reason whatever, the Curtis unfailingly unloads the Compressor so that when it starts again it will not start against tank pressure, thus protecting the motor, belt and compressor from any possible damage due to starting strains."

The invention is an improvement on patent 686,778 to use variation in air-flow rather than in tank pressure to govern the unloader action.