US1448578A - Resistance element - Google Patents

Description

Mar. 13, 1923.

A. R. SWOBODA RESISTANCE ELEMENT Filed Mar. 10, 1922 WV/VfO/ Add h R Swokoda.

XMKZM A ry Patented Mar. 13, 1923.-

UNITED STATES, PATENT OFFICE.

ADOLPH R. SWOBODA, OF NEWARK, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF

NEW YORK, N. Y., A CORPORATION OF NEW YORK.

RESISTANCE ELEMENT.

Original application filed December 6, 1920, Serial No-428,540. Divided and this application filed larch 10, 1922. Serial No. 542,548.,

To all whom itqnay concern.

Be it known that I, Anonrii R. SwoBonA,

a citizen of the United States, residing at Newark, in the county-of Essex, State of New Jersey, have invented certain new and useful Improvements in Resistance Ele .a resistance element which is simple in construction, cheap in cost, and which may be easily mounted upon its supporting mem-- .ber.

More specifically, the invention comprises a tiny resistance element, consisting of acoreless winding of insulated resistance wire formed into an elongated unit and bound together, the unit being so small and light and of such character that it may be secured to a supporting member by an adhesive ma-v terial. This unitary structure is particu larly adapted for use in rheostats and other apparatus, where it is necessary to provide an eflicient and very compact resistance element.

Other objects and features of the invention willappear from a consideration of the following description taken in conjunction with the accompanying'drawing and the appended claims.

In the drawing, Fig. 1 is a front view, part in plan and part in section showing the invention in its preferred form;

Fig. 2 is a perspective view of the assembled resistance element; and

Fig. 3 is a top elevation of a rheostat equipped with several such resistance elements.

Referring to the drawings, the resistance element consists of very small coreless windings of high resistance insulated wire 5. A lead 6 of fairly heavy gauge stranded copper wire is soldered to each end of the wire 5, and a sleeve 7, of varnished tubing or other comparatively stiff material, is slipped over the leads. These sleeves or splints not only act as an insulation for the copper leads, but they serve as reinforcing members for the element. The assembled resist-' plate 9, and is a ance element is formed into an elongated unit of substantially the same length as the sleeves 7, and is tied together at its middle p ortign with a loop of thread 8, as shown in fieferring particularly .to Fig. 3, there is shown a rheostat mounting plate 9, supporting an arcuate row of fixed contacts 10,each of which extends through anaperture in the plate in a manner well understood in the art. A contacting successively engage the fixed contact members 10. Connected between succeeding contacts 10 are the small resistance elements which lie flat against the mounting plate 9 and are secured thereto by an application of gated unit, and means forbinding the turns together.

2. A resistance element comprising an elongated coreless winding of insulatedwire, two sleeves, one for each terminal of the winding, said sleeves situated on opposite sides of said winding and adapted to serve as a reinforcement therefor, and means for securing'th'e winding and sleeves together.

3. A resistance element comprising accreless winding of insulated wire, a member serving as a splint, and means securing said winding to said splint.

4. A resistance element comprisinga coreless winding of insulated wire, a pair of Amembers serving as splints and having a length at least equal to said winding, and means securing said splints together with the winding between them.

5. A resistance element comprisingacoreless winding of insulated wire, a terminal wire'secured to each end of said winding and of heavier gauge than said winding, two sleeves one for each of said terminals,

arm 11 is pivoted on theapted to rotate over and.

said sleeves serving as areinforcement for said winding, and means for securing the winding and sleeves together.

6. A resistance element comprisingacore- .5 less winding of insulated wire, an uninsulated terminal wire secured to each end of said winding and of heavier gauge than

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