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US Patent: 956,822
Grinding Tool
Patentee:
Millard F. Parsons - Kansas City, KS

USPTO Classifications:
173/216, 451/117, 74/70

Tool Categories:
specialty tools : valve grinding tools

Assignees:
None

Manufacturer:
Parsons Valve Grinder Co. - Kansas City, MO

Witnesses:
Helen C. Rodgers
G. Y. Thorpe
Frank R. Glom

Patent Dates:
Applied: Dec. 03, 1909
Granted: May 03, 1910

Patent Pictures:
Millard F. Parsons patent May 3, 1910
USPTO pdf tiff
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Description:
Complicated internal gearing including "sun and planet" impart progressive forward motion combined with oscillating rotary motion to the driven member.

The patent describes the tool in alternate forms as an add-on for a breast drill, or as a stand-alone crank driven tool.

Produced as the "PERFECT PARSONS VALVE GRINDER."

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