US Patent: 1,365,302 - Direct-current motor


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US Patent: 1,365,302

Direct-current motor

Patentee:

James Burke (exact or similar names) - Erie, PA

USPTO Classifications:

310/187

Tool Categories:

electrical devices : electric motors : DC motors

handheld power tools : handheld power drills

Assignees:

Burke Electric Co. - Erie, PA

Manufacturer:

Burke Electric Co. - Erie, PA

Witnesses:

Unknown

Patent Dates:
Applied:	Mar. 14, 1917
Granted:	Jan. 11, 1921

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Burke Electric Co.

Description:

The innovation is a motor that acts as a shunt-wound motor at no load (to limit no-load speed) and a shunt/series motor under heavy lad (to provide low-speed high-torque characteristic). This motor was intended for use in handheld drills.