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US Patent: 583,935
Series Parallel Controller
Patentees:
William B. Potter (exact or similar names) - Schenectady, Schenectady County, NY
Frank E. Case (exact or similar names) - Schenectady, Schenectady County, NY

USPTO Classifications:
200/10, 200/5R, 200/7, 318/95

Tool Categories:
electrical devices : electric motors : motor controls

Assignees:
General Electric Co. - Schenectady, Schenectady County, NY

Manufacturer:
General Electric Co. - Schenectady, Schenectady County, NY

Witnesses:
B. B. Hull
A. F. Macdonald
A. H. Abell

Patent Dates:
Applied: Oct. 10, 1896
Granted: Jun. 08, 1897

Patent Pictures: [ 1 | 2 | 3 | 4 | 5 ]
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"Vintage Machinery" entry for General Electric Co.
Description:
This patent was incorporated into Streetcar motor controllers.

Abstract:

The present invention has for one of its objects to reduce the vertical height of the resistance-switch cylinder, at the same time maintaining the necessary insulation between the contacts thereon. This feature of the invention is accomplished by providing two sets of stationary brushes or contact devices adapted to engage with the contacts carried by the resistance-switch cylinder. The brushes are located, preferably, at points diametrically opposite and, as the cylinder reciprocates, are adapted to engage therewith and vary the resistance of the motor-circuit.

Claim:

In a controller, the combination of a cylindrical switch, contacts thereon, and sets of stationary brushes engaging therewith, the brushes and contacts bearing such a relation to each other that the circuit is alternately completed or broken at one set, then at another.

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