Variable transformer with slidable contactor
OwnerEdward J. Hobartinventor
Life of this patent
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Abstract
A voltage control system has a pair of clockwise and counterclockwise interleaved coils on a portion of a transformer core, the coils having multiple spaced turns providing sets of co-planar alternate electrical contact pairs extending linearly to form a tapping system for varying the output voltage of the transformer. A conductive electrical bridging member is movable in the linear direction of extension of the contacts and bridges a selected pair of contacts, one contact from each coil, to alter the effective number of electrical turns of the two coils between a minimum and maximum output voltage. An adjunctive feature is to provide both a contact lead to the bridging member and appropriate rectification at output ends of the pair of coils in order to produce a direct current output.
Claims13
In a voltage control system for an alternating current power supply;
- a core having an elongated coil-supporting portion electromagnetically connected to said power supply;
- a first electrically-conducting coil having multiple spaced clockwise turns evenly wound about and extending essentially helically lengthwise of said elongated coil-supporting portion;
- a second electrically-conducting coil having multiple spaced counter-clockwise turns evenly wound about and extending essentially helically lengthwise of said elongated portion for essentially the same effective length as said first coil, with at least a portion of each turn of said second coil being alternately interleaved with a portion of each turn of said first coil;
- means insulating said coils from each other and from said elongated coil-supporting portion;
- said portions of each of said turns of said coils being uninsulated at least on their outermost sides and said turn portions extending perpendicularly to said elongated coil-supporting portion where said coils are interleaved, all of said outermost sides of the turns of both coils being located in a common linear plane extending parallel to said elongated coil-supporting portion to provide a linear set of electrical contacting surfaces, and said outermost sides providing adjacent spaced pairs of such electrical contact surfaces;
- an electrically-conducting bridging member for simultaneously contacting and electrically bridging a selected pair of said contact surfaces, one from said first coil and the other from said second coil whereby to provide a first effective number of electrical turns of said combined coils to provide a first voltage output therefrom;
- means mounting said bridging member for movement along a fixed path parallel to said linear set of contacting surfaces whereby said bridging member can bridge other selected adjacent pairs of contact surfaces to provide a different effective number of electrical turns of said combined coils and different output voltages therefrom;
- and,
- means supporting said bridging member for firm electrical contact with said contact surfaces when said bridging member is moved along said set.
Dependencies are inferred from the claim text.