US Patent: 882,602
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| Controlling-Switch
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Patentee:
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| Harold E. White (exact or similar names) - Schenectady, Schenectady County, NY |
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Patent Dates:
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| Applied: |
Sep. 18, 1906 |
| Granted: |
Mar. 24, 1908 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for General Electric Co.
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Description: |
| This patent was incorporated into Streetcar motor controllers.
Abstract:
My invention relates to controlling switches employing blowout magnets and is particularly applicable to motor controllers.
It is frequently desirable that the arc formed at each contact-finger should always be blown in the same direction, and since the current through the contact-fingers may be reversed in different positions of the switch, it has been proposed heretofore, in order to secure the desired result, to provide individual blowout coils for each of the fingers, each of which is connected directly in series with its finger, so that when the direction of current through the finger reverses, the direction of current through the blowout coil will also be reversed. When individual blowouts are employed it may sometimes happen that adjacent coils may have a difference of voltage equal to the entire voltage of the system and consequently it is necessary to provide insulation adapted to withstand this voltage. To secure in a compact structure both an efficient magnetic circuit and the necessary insulation so disposed as to permit unobstructed movement to the expanding arc, presents problems, which it is the object of my invention to solve.
My invention in one aspect consists in separating the main poles of the blowout coils from the coils themselves by insulation and providing auxiliary pole-pieces for inductively magnetizing the main poles. By the use of these auxiliary pole-pieces an efficient magnetic circuit may be secured, while at the same time the insulation between each coil and its main pole-piece serves effectively to insulate adjacent blowout coils from each other.
Claim:
In a controlling switch, in combination with a rotary drum and contact-fingers engaging therewith. individual blow-out coils connected directly in series with the several fingers, auxiliary pule-pieces in magnetic contact with the cores of said coils, and main pole-pieces separated from the auxiliary pole- pieces by insulation and magnetized inductively thereby. |
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