DEVICE FOR VARYING THE INDUCTANCE OF A HELICAL INDUCTOR
First Claim
1. An improved device for varying the inductance of a cylindrically shaped wound coil having a plurality of turns of selected diameter and length, said device comprising:
- a. an elongated cylindrical member of insulating material;
b. said member having first external threads which extend from one end to an intermediate point thereof for engaging the internal part of turns of a wound coil;
c. said member having second external threads which extend from said first threads and said intermediate point to the other end thereof form engaging the internal part of turns of a wound coil;
d. said first threads having a first selected pitch and said second threads having a second selected pitch that is greater than said first pitch and that is joined thereto by a smooth transition so as to space the turns of a coil by said second threads and thereby change the inductance of a wound inductor;
e. and a nonmagnetic, conductive element symmetrically positioned about the longitudinal axis of said cylindrical member and within said cylindrical member in the vicinity of said second threads, for providing an added effect on the coil inductance.
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Abstract
An insulating member has an external helical thread that threads inside the turns of a helical inductor. A first part of the thread provides a first spacing between turns of the inductor, and a second part of the thread provides a second, greater spacing between turns of the inductor. A nonmagnetic, conductive element is positioned inside the insulating member in the vicinity of the second part of the thread. With the first part of the thread engaging the inductor, a high value of inductance is provided. When the insulating member is rotated so that the second part of the thread engages the inductor, the increased spacing of the inductor turns and the nonmagnetic, conductive element combine to decrease the inductance of the inductor by an amount dependent upon the amount that the second part of the thread and the element are introduced into the inductor.
8 Citations
1 Claim
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1. An improved device for varying the inductance of a cylindrically shaped wound coil having a plurality of turns of selected diameter and length, said device comprising:
- a. an elongated cylindrical member of insulating material;
b. said member having first external threads which extend from one end to an intermediate point thereof for engaging the internal part of turns of a wound coil;
c. said member having second external threads which extend from said first threads and said intermediate point to the other end thereof form engaging the internal part of turns of a wound coil;
d. said first threads having a first selected pitch and said second threads having a second selected pitch that is greater than said first pitch and that is joined thereto by a smooth transition so as to space the turns of a coil by said second threads and thereby change the inductance of a wound inductor;
e. and a nonmagnetic, conductive element symmetrically positioned about the longitudinal axis of said cylindrical member and within said cylindrical member in the vicinity of said second threads, for providing an added effect on the coil inductance.
- a. an elongated cylindrical member of insulating material;
Specification
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- Resources
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Current AssigneeRaymond S. Bunch, Richard B. Sanger
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Original AssigneeRaymond S. Bunch, Richard B. Sanger
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InventorsBunch, Raymond S., Sanger, Richard B.
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Primary Examiner(s)Kozma, Thomas J.
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Application NumberUS05/079,858Time in Patent Office512 DaysField of Search336/20,75,77,136US Class Current336/20CPC Class CodesH01F 21/02 continuously variable, e.g....
