US1540789A - Testing transformer - Google Patents

Description

June 9, 1925.

C. M. M CORD TESTING TRANSFORMER Filed AprilV, 1924 Ill Patented June 9,1925.

UNITED STATES CLAUDE M. MCCORD, OF RICHMOND HEIGHTS, MISSOURI.

TESTING TRANSFORMER.

Application filed April 7,

To all whom it may concern.

Be it known that I, CLAUDE M. MCCORI),

a citizen of the United States, residing at Richmond Heights, St. Louis County, State of Missouri, have invented a new and useful Testing 'lranst'ormer, of which the following is a specification.

This invention relates to testing transformers. I

An object of the invention is to provide a testing transformer so constructed that the expense involved is greatly reduced without sacrificing any of the merits ot'v the device. Instead of a laminated core which has heretofore been universally employed, so far as I am aware, I use an integrally cast core with the spaced arms thereof integrally united at their lower ends and each divided into a number of separated strips or sections.

Another object oi? the invention is to provide a testing transformer comprising an integrally cast core as distinguished from a laminated core. i

Other objects will appear'trom the following (lQSCIiPtlOIl, reference being made to the drawing in which I Fig. 1 is a plan view of my improved testing transformer.

Fig. 2 is an end elevation.

Fig. 3 is a side elevation.

Fig. i is a vertical cross sectional view on the line 4l of Fig. 1. i

Fig. 5 is a view showing one of the spacers removed from the core.

The core comprises an integral casting composed of the upwardly extending sin flanges 1 and the.downwardly extending side langes 2. The upper side flanges and the body of the core have transverse slits therein extending from the upper ends of the side flanges downwardly entirely through the body of the core, which slits are filled with sheets oi asbestos. A coil 3 is wound around i the body ot the core that integrallyunites the strips 1 at opposite sides of the core. The ends of the wire of the coil 3 are connected with the binding posts 4. The strips 1 and the cross connection upon which the coil 3 is wound are formed in spaced relationship by placing in the mold sheets of asbestos, after which the molten metal is poured into the mold completely filling the spaces between the sheets of 1924. Serial N0. 704,628.

asbestos, with the result that the spaced strips 1 are produced. When the core is removed from the mold the protruding portions of the asbestos sheets are removed, while the spaces between the strips 1 remain tilled with the asbestos.

I have produced testing transformers in accordance with this invention and have found that they can be produced at much less cost than the usual laminated transformers, and that they are equally satisfactory and successful in use. The invention obtains all of its intended objects and purposes in a highly satisfactory manner and is a distinct advance in the art.

Wl'iat I claim and desire to secure by Letters Patent is:

1. An integrally cast'testing transformer comprising a. body portion, upwardly extending flanges at the sides of the body portion, and downwardly extending flanges supporting the body portion, said upwardly extending flanges and body portion having transverse slits therein. 1

2. An integrally east testing transformer comprising a body portion, upwardly extending flanges at the sides of the body portion, and downwardly extending flanges .S1ll)01tl11 the body Jortion said u )wardly m a l extending flanges and body portion having transverse slits therein which extend downwardly entirely through the body portion.

3. An integrally cast testing transformer comprising body portion, upwardly extending flanges at the sides of the body portion, downwardly extending flanges supporting the body portion, said upwardly extending flanges and body portion having transverse slits therein which extend downwardly entirely through the body portion, and asbestos sheets filling said slits.

4. A testing transformer core comprising an integral casting having transverse slits extending downwardly from the upper side thereof, and sheets of non-metallic substance filling said slits from the top downward.

5. A cast metal core or path subjected to a varying magnetic flux. and comprising an integral iasting having transverse slits extending entirely through the body there of from the upper side to the lower side, and asbestos sheets filling said slits.

CLAUDE M. M CCORD.

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