US1744870A

US1744870A - Stencil sheet and process of applying same to workable surfaces

Info

Publication number: US1744870A
Application number: US295474A
Authority: US
Inventors: Louis D Davis
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-07-26
Filing date: 1928-07-26
Publication date: 1930-01-28
Anticipated expiration: 1947-01-28

Description

Jah. 28, 1930. 1.. D. DAVIS 1,744,870

STENCIL SHEET AND PROCESS OF APPLYING SAME TO WORKABLE SURFACES Filed July '26. 1928 Patented Jan 2 1930 UNITED sures PATENT" OFFICE DAVIS, F PHILADELPHIA, PENNSYLVANIA STENCIL SHEET AND PROCESS OF PPLYJ IENG SAME TO WORKABLE SURFACES Application filed July 26, 1928. Serial No. 295,474.

This invention relates to a stencil sheet fois the article thereafter set aside to permitthe composition to ber ome sulficiently hard to permit sketching. of the figure to be produced,

on the surface of the composition.

After the composition assumed the requisite degree of solidification to permit of the said sketching on the surface thereof the figure, to be produced on the surface of the article, was sketched on the surface of the composition and the outline of the sketched figure cut through the composition to the underlying surface of the article, after which the portion of the layer of composition lying with the cut outline of the figure was removed. exposing the portion of surface of the article which was to he insculptured by the sand blast method.

The layer of composition-'surrounding the figure functions as a stencil to prevent the covered portion of thesurface of the article from being affected by the sand used in carrying out the sand blast method.

The composition being, more or less of a hydroscopic nature required considerable time to assume the proper state of solidity to permit of the sketching of the figure thereon. depending on atmospheric conditions to which it was exposed.

Another disadvantage of the method of spreading the composition on the surface to he insculpturcd is that it is extremely difficult and almost impossible to produce manually a layer of the composition having a uniform thickness throughout. which causes the composition to dry out unevenly and is, therefore, diflicult to sketch upon and to cut.

The principal object of my invention is to provicc the composition in a sheet form of uniform thickness throughout and to provide a suitable liaclfing on one side of the sheet of composition which will be sufficiently tough to permit of the handling of the sheet, and which may be readily peeled olf or otherwise removed from the composition when the same has been applied to the surface to be insculptured.

My invention also resides in the method employed in placing a uniform layer of composition on the surface to be insculptured, which comprises the use of a web of tough paper, such as parchment or a suitable fabric which will not disintegrate when saturated with water. coating the web with a layer of the composition f of uniform thickness throughout while the composition is in a plastic state. drying the composite sheet. subsequently moistening the exposed surface of the composition which softens this face of the composition suificiently to cause it to adhere to the surface to be insculptured. applying the sheet to the said surface to be insculptured, moistening the backing sheet either before or subsequent to the application of the sheet to said surface to be insculptured which causes the surface of the composition adjacent the backing sheet to become moistened to reduce the effective adhesion between the backing sheet and the compositionto such an extent that the hacking sheet may be readily peeled off the composition without disturbing the state of adhesion of the composition relative to the surface to be insculptured.

Referring to the drawings:

Fig; 1 is a perspective View of a stencil sheet made in accordance with the principles of my invention; and

Fig. 2 is a perspective View of the stencil sheet-applied to a surface to be insculptured. showing the backing sheet as being partially removed from the sheet of composition.

In the drawings. the stencil sheet 1 is SlMWn. as comprising a suitable backing sheet Z. having on one of its sides a coating or sheet 3 of a suitable relmfiing composition. X is an article such as a body of stone. ctc.. having a surface :20 which is to he insculptured.

The component ingredients of the rebuffing composition are well known. usually consisting of a mixture of glue and glycerine in suitable proportions. Substitution of a well known substance of analogous nature to and for either one or both of the said substances may be made without departing from the .essential features of the invention.

The points of importance in connection with the rebufling composition as far as this invention is concerned are that the composition be soluble in water. and that the said composition shall have the requisite ability to withstand or rebuff the assaults of the sand blast.

As this con'iposition invarious forms and composed of various ingredients is well known to the art. and forms no part of the present invention. no claim is made thereto.

The backing sheet 2. according to the principles of my invention. preferably composed of what is generally known as parchment paper, a paper which. when subjected to or saturated with water. will not disintegrate.

larchment paper. as is well known. can be freely handled when wet without fear of dis-. integration. Other papers or fabrics of an analogous nature may be employed without departing from the essential f atures of the invention.

The ll \'tllO-F()lld!l( rebuiling composition for the best practical purpos s is preteral 1 applied to the h \'drescopie backing sheet. any well known mechanical device capable of producing-a coating of uniform thickness throughout. on the one surface of the ha king sheet.

The rebuliing' compound being applied to the backing sheet while in a plastic state adheres to the backing sheet and is subsequently dried.

The stencil sheet. before being applied to the surface to be insculptured. is preferably submerged momentarily in water to soften the exposed surface of the re ulling compound in order that it will readily adhere to the surface to which the stencil sheet is applied. I

The stencil sheet is then placed on the surface to be insculpt-ured with the moistened exposed side of the rebelling compound adacent thereto.

The momentary suhmerging of the stencil sheet permits sutllcient of the water to penetrate the backing sheet to loosen the rubulling composition sulliciently to permit the backing sheet to be readily peeled oil the rebutting composition without loosening the rebull'iug sheet from the surface to be insculptured. to which it has been applied.

'hile I prefer to submerge the sheet. as above. noted. the exposed side of the rebulling compound may be moistened before being applied to the article and the exposed face of stencil sheet has been applied. rolled, or

the backing sheetmay be moistened after the otherwise treated to flatten the stencil sheet on the surface to be insculptured.

After the stencil sheet has been applied and the backing sheet removed. the rebulling compound is ready for immediate use. as the body of the compound has not been atl'ected by the slight amount of water applied for the purpose of causing the compound to adhere to the surface of the article and for loosening the hacking sheet.

After the insculpturing of the surface of the article has been completed. the rebutiing compound which formed the stencil or shield is removed in the usual manner.

I claim:

A process for ai iplying a hydro-soluble rehutl'ing composition to a surface to be insL-ulptured by ducing the compound to a substantially plastic state. applying the compound while in said plastic state to one side of a acking sheet of parchment paper while said compound is in said plastic state whereby said compound adheres -o said backing sheet. drying the coated sheet to solidly the compound. subsequently moistening the exposed face of the compound to produce an adhesive condition thereon. applying this adhesive face of the compouml to the surface to he insculptured. moistening the backing sheet to reduce the stateof adhesion between the sheet and the compound. and linally peeling the backing sheet oil' the layer of compound.

LOUIS I). DAVIS.

sand blast. consisting of re-