US Patent: 2,281,307 - Commutator lathe and mica trimmer


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US Patent: 2,281,307

Tool
Commutator lathe and mica trimmer

Patentee:

Ernest L. Johnson (exact or similar names) - Ferguson, MO

USPTO Classifications:

29/27B, 82/128

Tool Categories:

specialty machines : commutator dressing machines

Assignees:

None

Manufacturer:

Johnson Engineering Co. - Ferguson, MO

Witnesses:

Unknown

Patent Dates:
Applied:	Jun. 03, 1940
Granted:	Apr. 28, 1942

Patent Pictures:

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"Vintage Machinery" entry for Johnson Engineering Co.

Description:

An example is reported, made by Johnson Engineering Co. and with this patent number marked on it. The tool is made of die-cast zinc alloy and both turns down the armature and grooves the mica insultation between the segments of the armature. The tool came with a set of bushings to fit various diameters of shafts.