CA Patent: 628,890 - Pump control


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CA Patent: CA-628,890

Pump control

Patentees:

Walter Ernst (exact or similar names) - Dayton, OH

Frederick G. Krafft (exact or similar names) - Springfield, OH

USPTO Classifications:

Tool Categories:

metalworking machines : grinding machines

metalworking machines : metalworking machine mechanisms : hydraulic apparatus

Assignees:

Thompson Grinder Co. - Dayton, OH

Manufacturer:

Thompson Grinder Co. - Springfield, OH

Witnesses:

Unknown

Patent Dates:
Granted:	Oct. 10, 1961

Patent Pictures:

CIPO Data
Report data errors or omissions to steward Jeff Joslin
"Vintage Machinery" entry for Thompson Grinder Co.

Description:

This invention relates to speed control of a hydraulic motor that keeps its speed constant under varying load. A key design goal was to minimize heating of the hydraulic fluid.