US2232846A - Identifying strip for use in connection with insulated electrical conductors - Google Patents

Description

Feb. 25, 1941. FREYDBERG 2,232,846

IDENTIFYING STRIP FOR USE IN CONNECTION WITH INSULATED ELECTRICAL CONDUCTORS Filed June 24, 1959 GENE/M750 CELLl/L 06E IN VENT OR.

ATTORNEYS Patented Feb. 25, 1941 PATENT OFFICE IDENTIFYING STRIP FOR USE IN CONNEC- TION CONDUCTORS WITH INSULATED ELECTRICAL Eli Freydberg, New York, N. Y., assignor to Freydberg Bros, Inc., New York,

of New York N. Y., a corporation Application June 24, 1939, Serial No. 280,919

4 Claims.

'' ductor; to provide such a strip which is adapted to withstand temperatures such as those used in saturating the cotton coating of the conductor; and to provide such a strip which is stronger and more heat-resistant than sheets or films of Cellophane.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises an article of manufacture possessing the features, properties, and the relation of elements which will be exemplified in the article hereinafter described and the scope of the application of which will be indicated in the claims.

For a fuller understanding of the nature of the invention, reference should be had to the accompanying drawing, in which:

Figure 1 represents diagrammatically and in perspective a composite sheet or strip embodying the invention; and

Fig. 2 represents an insulated conductor withsuch a sheet or strip being incorporated in the coating of the metallic core thereof.

Attempts to provide identifying, strips of indicia-Ibearing Cellophane, or regenerated cellulose, in connection with commercial insulated electric conductors, have heretofore been unsatisfactory, for if the rubber insulating coating of the metallic core of the conductor is covered with a Cellophane strip bearing suitable identifying indi'cia,

and-if the strip is then covered with a suitable.

or film of Cellophane, for example a sheet or film approximately .0009 of an inch in thickness, which is provided with a coating on its outer or exposed surface of a cellulose ether, and more specifically a coating of ethyl cellulose. This coating may be approximately .0003 of an inch in thickness, giving to the entire composite sheet a thickness slightly in excess of one mil.

Such a sheet is shown diagrammatically in Fig. 1, where the composite sheet I0 comprises a regenerated cellulose film P2 to which a thin film of ethyl cellulose I4 is suitably bonded.

To provide identification, the Cellophane strip I! may bear indicia, such for example as the letters l6, printed preferably upon that face of the sheet to which the ethyl cellulose coating is subsequently applied. If the ethyl cellulose coating is then provided with a pigment, indicated by the stippling in Fig. 1, the effect is of a two-color printing process, and many desired combinations of colors, printing, designs, etc., may be employed to provide a vast number of different identifying indicia.

Such a composite sheet possesses much greater resistance to heat, and more particularly to the temperatures used ordinarily in treating the cotton thread coating of the conductror with a hot saturant, than does a strip of Cellophane. The

composite sheet for example, will withstand temperatures in the neighborhood of 350 F. without deterioration. J

The composite sheet is preferably wrapped or folded around the rubber insulation 20, which surrounds the metallic core 22 of the electrical conductor 30, shown for example in Fig. 2, and the sheet or film I0 is preferably so positioned around the rubber insulation that the ethyl cellulose coating 14 is on the outer surface of the sheet. The cotton covering 24 is then applied and the conductor may be subjected to the standard hot saturation process without fear of destroying the layer ID as an identification. The composite layer maintains its form, its color properties and its'other physical properties as a strip bearing identifying indicia, even after being comprise any cellulose ester coated with any compatible cellulose ether.

Since certain changes in carrying out the above process, and certain modifications in the article which embody the invention may be made without departing from its scope, i-t'is intended that' all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended .to cover all the generic and specific features of the invention herein described, and all statements of the scope oi the invention which, as a matter of language, might be said to fall therebetween.

Having described my invention, what I claim I as new and desire to secure by Letters Patent is:

ing said core, an outer covering entirely impregnated with a saturant, and an identification strip positioned intermediate said outer covering and said insulation layer and comprising a printed sheet of regenerated cellulose, and with a coating on its outer surface of ethyl cellulose of such thickness as to protect said regenerated cellulose from deterioration at temperatures of approximately 300 F.

3. An insulated electrical conductor comprising a metallic core, an outer covering entirely impregnated with a saturant, and an identification strip positioned intermediate said outer covering and said metallic core and comprising a sheet of regenerated cellulose bearing identifying indicla, with a coating on its outer surface of ethyl cellulose of such thickness as to protect said regenerated cellulose from deterioration at temperatures of approximately 300 F.

4. An insulated electrical conductor comprising a metallic core, an outer covering entirely impregnated with a saturant, and an identification strip positioned intermediate said outer covering and said metallic core and comprising a sheet of regenerated cellulose having a thickness of approm'mately .0009 of an inch, and with a coating on its outer surface of ethyl cellulose having a thickness of about 0.0003 inch.

ELI FREYDBERG.

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