US1450739A - Material for phonograph record blanks and process of making the same - Google Patents

Description

'Apr.-3, .1923.

1, 450,739 J. .P.. ELLIOTT MATERIAL FOR *PHONOGRAPH RECORD BLANK S AND PROCESS QF MAKI NG THE SAME Filed Spt. 15, 1920 Patented Apr. 3, 1923.

UNITED STATES PATIENT OFFICE.

JAMES P. ELLIOTT, OF CHICAGO, ILLINOIS; MARY BRODEES ELLIOTT EXECUTE/IX OF I SAID JAMES P. ELLIOTT, DECEASED.

MATERIAL FOR PHQNOGRAPH RECORD BLANKS AND PROCESS OF MAKING THE SAME.

Application filed September 15, 1920. 'Serial No. 410,425.

To all whom/it may concern:

Be it known that I, JAMEs P. ELLIOTT, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, hfiNe invented a certain new and useful Im- 'provement in Materials for Phonograph Record Blanks and Process of Making the Same, and declare the following to be a full, clear, and exact' description of the same, such as will enable others skillediH the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form apart of this specification.

The materials out of which phonograph disc records are made are comparatively brittle so that the records break easily unless they are made quite thick. The composition employed in making the records is costly so that thickening the blanks to guardagainst accidental fracture is an expensive expedient; v The object of the present invention is to produce a composite sheet or body adapted for, use in making phonograph records, which sheet or body shall possess all of the desirable qualities of the usual blanks and at the same time be practically unbreakable in ordinary use and much cheaper than heavy records of the usual material would be.

In accordance with my invention I build up a composite sheet or body out of a layer or layers of fibrous material impregmated with asphalt, pitch or other material which is cement-itious when heated and more or less hard at ordinary or room tempera.- tures and a layer or layers of ordinary .record blank material; the same being united, and preferably compacted into a single rigid sheet having one or both faces covered with i the usual record composition. My improved product may therefore be used in making single or double faced records in the usual way but, by reason of the presence of the core, will be tough and not easily broken.

The various feature s of novelty. whereby my invention is "characterized will hereinafter be pointed out with particularity in the claims; but, for'a full understanding of my invention and of its objects and advantages, reference may ,be had to the following detailed description taken in connection with the accompanying drawings, wherein:

Figure 1 is a cross section through asheer pleted sheet.

'In carrying out my invention .I employ a sheet or body, 1, as indicated in Fig. 1 of'the drawing, which is preferably made in accordance with the disclosure of my prior Patent 1,305,081, the process of tlie aforesaid patent being stopped after the completion of a fibrous sheet containing the asphalt,'pitch or other cementitious material in apowdery or other .comminuted form. If a product adapted for making only single faced records is desired, there is laid upon the sheet, 1, a thin layer or sheet, 2, of the usual record c0mposition.- If a product adapted for making double faced records is desired, a second sheet or layer, 3, similar to the sheet or layer 2, is laid against the opposite side of the sheet 1. The group of sheets or layers is then subjected to heat and pressure, causing the comminuted cementitious material to fuse or melt and distribute itself uniformly throughout the sheet or layer 1, the pressure serving to force the sey eral sheets or layers firmly together and, if desired. compacting the core sheet or layer to any desired degree; the final product being that illustrated in Fig. 2 wherein the core layer, if the cementitious material be asphalt or pitch, has assumed substantially the appearance of hard rubber. During the heating and pressing operation the cementitious material, in its molten condition, is forced into intimate contact with the layer or layers of record composition and causes ..the several layers tobe united into a single rigid body.

The fibrous material in the core layer may take any desired form, but is preferablycompose'd of long fibers since such fibers will make the material tougher than if extremely short fibers are employed.

While I have illustrated and described with particularity only a single preferred form of my invention, I do not desire to be limited to the exact structural details 'thus illustrated and described; butintend to cover all forms and arrangements which come within the terms employed in the definitions of my invention constituting the appended claims.

I claim:

1. The method of making material phonograph record blanks which consists in laying a layer of phonograph record composition upon a porous layer of fibrous material containing in a powdered or granular form a binder which is cementitious when heated, and then applying heat sufficient to cause the binder to become cementi-- tious and presure suflicient to cause the layer containing the binder to become compacted and united to the other layer.

2. The method of making material for phonograph 'record blanks which consists in laying a layer of phonograph record composition upon a fibrous layer containing bltuminous material in a powdered orgranular form. and then for' applying heat to fuse the bituminous material and cause it to spread itself uniformly through the fibrous layer and pressure sufficient to condense and compact the latter layer and unite it to the other layer.

3. The method of making material for phonograph record blanks which consists in applying a layer of phonograph record c0mposition upon a body of bituminous material in the form of small individual particles having fibers distributed throughout the same, then applying heat and pressure to fuse the bituminous material, compact the same and unite it with the aforesaid composition.

4. A phonograph record body comprising layer of bituminous material having reinforcing fibers extending through the same united to a layer of phonograph record composition.

In testimony whereof. I sign this specification.

J AMES P. ELLIOTT.

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