US1889390A - Method to produce a crystal article - Google Patents

Description

Nov.29,193 2. J, T R 1,889,390

METHOD TO PRODUCE A JRYSTAL ARTICLE Filed May 26, 1930 m////A\\ kW A k\\ W/V/ IN V EN TOR. 25.: raj 77mm,

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A TTORNEY' I Patented Nov. 29, 1932 nnrrsn sTArss ALBERT J. THROM, OF GRAPEVILLE, PENNSYLVANIA METHOD TO PRODUCE A CRYSTAL ARTICLE Application filed May 26,

This application is a continuation in part of an earlier application bearing Serial No. 237,448, filed December 3, 1927.

The object of the invention is to provide a crystal article carrying a design of appropriate form incorporated in the article belowth e surface thereof and completely covered by a layer of glass, so that, where the design is in the form of indentations, these may not pro vide pockets for dust, the outer layer of glass presenting a smooth surface making easy cleaning of the article possible and also adding a lustre to the design; and to rovide a method for the production of suc articles whereby they may be easily and cheaply made and with a minimum number of steps in the method.

In the drawing accompanying the application, Figure 1 illustrates in section a conventional form of glass mold and in elevation a conventional plunger such as are used in the initial step in the production of an article constructed in accordance with the invention.

Figure 2 is a view similar to Figure 1 but illustrating the second step.

Figure 3 is an elevational view of the formed article.

For purposes of illustration, there is shown a conventional form of glass dish 10 constructed in accordance with the invention, the latter having a pedestal 11 and a base 12, with a globular section 14 included in the pedestal as an element thereof. The design is formed in the globular section 14 and in the initial. step of casting the article, a mold such as that illustrated at 15 is employed, this mold forming the body portion and pedestal 11 of the article and also forming what might be termed the core 16 of the globular port-ion 14. In this initial step, only the dish portion proper, the pedestal and the core 16 are formed and in this operation the design is formed in the core, in the illustrated embodiment, the design being in the form of indentations 17 representative of a flower disposed uniformly over the surface of the core.

The plunger 18 is employed in this initial step, since this first section of the article is formed by pressing.

1930. Serial No. 455,856.

' When that portion of the article formed by the mold 15 has cooled-that is, has attained sufficient rigidity to permit its removal from the mold but has not become cool enough to crack on the application of molten glass over 5' itit is transferred to a second mold such as that indicated at 19, this mold having a cavity conforming to the shape of the article as formed by the first mold but holding the article in inverted position with the core portion 16 disposed in an article forming cavity 20, this cavity 20 being larger than the core but conforming to the shape of the globular portion 14 and the connected base portion 12. The core is thus spaced from the walls of the cavity 20 and when the molten glass is admitted to this cavity and subjected to the pressure of the plunger 21, a layer of glass is formed over the core and the base 12 is formed in the conventional cup shape to be spun into disk form after the article is removed from the mold 19.

The core receiving cavity 20 in the mold 19 is just enough larger than the core to provide a covering layer for the latter that will not carry sufficient heat to fuse the core, the latter on the other hand being at a high enough temperature at the time of the performance of this operation not to crack. By this plan, the flower design formed by the indentations 17 is retained intact and is enclosed by a glass layer which serves to intensify the effect created by the indentations. At the same time, this layer protects the indentations from dust which would affect their lustre. Also it makes possible easy cleaning of the globular portion since the outer or superficial surface of the same is uniformly smooth.

The invention having been described, what is claimed as new and useful is V 99 i 1. The method of incorporating a design in a crystal article which comprises molding the same in sections by first pressing one section in a mold containing the design so that the latter is superficially formed in and from the material of the pressed section, and thereafter placing this section in a second mold V and molding the remainder of the article by pressing a molten layer of glass over the design carried portion. 100

2. The method of incorporating a design in a crystal article which comprises molding the same in sections by first pressing one section in a mold containing the design so that the latter is superficially formed in and from the material of the pressed section, and thereafter placing this section in a second mold and molding the remainder of the article by pressing a molten layer of lass over the design carried portion and limiting this layer to a thickness insuiiicient to carry heat enough to fuse the design carried portion.

3. The method of incorporating a design in a crystal article Which comprises molding the same in sections by first pressing one section in a mold containing the design that the latter is superficially formed in and from the material of the pressed section, and thereafter placing this section in a second mold and molding the remainder of the article by pressing a molten layer of glass over the design carried portion and limiting this layer to a thickness insufficient to carry heat enough to fuse the design carried portion, the latter being held at a temperature high enough to prevent cracking.

In testimony whereof he affixes his signature.

ALBERT J. THROM.

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