US1916753A - Ornamental glass - Google Patents

Description

. July 4, 1933.

F. CLARKE -ORNAMENTAL GLASS Filed May 19, 1952 Patented July 4,- 1933 FRANK CLARKE, or s'r. LOUIS, lmussolini,

ASSIGNOR T PITTSBURGH PLATE GLASS COMPANY, A CORPORATION OF PENNSYLVANIA OBNAMENTAL GLASS Application led May 19,

The invention relates'to ornamental glass designed particularly for use' in signs, but j not limited to such use. It has for its objects the provision of a glass' construction easily and cheaply produced and presenting an unusual and pleasing appearance, when viewed from the front. The invention is illustrated as applied to a single letter, butit will be understood that combinations of letters and il numbers may be used as well as a wide va riety of ornamental designs. One embodiment of'the invention is illustrated in the accompanying drawing, wherein:

Figure 1 is asection on theline I-I of Fig. 2.-'-\ Fig. 2 is a front elevation of the construction. Fig. 3 is a front elevation of the glass plate which has been provided withl itsornamentation in relief. Fig. 4 is a section on the line IV--IV of Fig. 3. Fig. 5 is a similar section, but with its rear face provided with color lms. And Fig. 6 is a section through the mirror of the face plate. Referring to the drawing, l isI a frame of any suitable type which carries the glass plates 2 and 3 and the backing 4 of any suitable material fo holding the glass plates in position. The plate 2 is shown as provided with a very simple design, namely the'letter E, but it will be understood that the principle is applicable tomore complicated designs. The design is `preferably formed on the rear face of the plate 2 by sand blasting.. This is accomplished by coating the border portion 5 and the letter portion 6 with a material resistant to the action of a sand blast, preferably a rubber composition. After the plate is thus coated, a sand blast is applied in the usual way, which sand blast removes the portion 7 of the platesurrounding the letter,

thus leaving the portions 5 and 6 in relief,

as -indicated in Fig. 5. The rubber coating is then removed and a-further light application of the sand blast is made to roughen the rear surfacev of the ortions 5 and 6, Yso that they will take an hold the paint or colorin more effectively than would the polished g ass Surface. f

The plate is now ready for coloring, which the backgroundcoating v9 may be yellow. The

much more uniform than plate employed back through.

may be done in various ways by hand or 1932. Serial No; 612,287.

back plate 3 is provided on its rear face with a coating 11 of silver or other suitable reflect-I ing material, such as cadmium, lead sulphide v or quick silver.- The parts are then assembled,

as indicated in Fig. l with the mirror plate 3 behind the face plate 2. This arrangement gives a design of unusualand pleasing appearance. The forming of the design in relief on the-back of the plate 2 makes it stand out more clearly-than is the case where a design is merely painted on the back of a. glass sheet. The use of the mirror behind the face plate Vbrightens the appearance of the design and renders it more attractive. The roughening of the rear surface of the face plate, due to the sand blasting, also improves the appearance as the reflection is softened and the application'of the loring material is heresuch coloring is applied to a polished glass surface. The colors employed are not opaque, but are relatively translucent so that a `certain amount of mirror reflection is noticeable through such colors. As agresult the desi n stands out clearly even in a relatively ysu dued light.

The term relief refers to the formation of the design either above the level of the background or below it, the general' effect being thev same in both cases.

' What I claim is:

In combination, a glass plate having its rear Vface provided with a desi n in relief, said design and the area of t e rear face surrounding it being roughened, and a second sheet of Aglass having its front face in engagement with the rear face of the first sheet and provided upon its other face with a metallic reflecting coating, said design and the surrounding area being covered by colored coatings applied thereto which are of contrastinfg y the re acting coating to re'liect vlight there- In testimony whereof, I have hereunto subscribed my name this 13th day of May, 1932.

. FRANK CLARKE;

color and are translucent to permit

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