US1770991A - Manufacture of silvered glass - Google Patents

Description

y 1930. L. OFFENBACHER 7 1,770,991

MANUFACTURE OF SILVERED GLASS Filed April 28, 1928 Patented July 22, 1930 UNITED STATES PATENT orrica L'UITPOLD OFFENBACHER, 0F FURTH, GERMANY, ASSIGNOR TO THE FIRM BAYERIBCHE SPIEGELGLAS-FABRIKEN BECHIIANN-KUPFER Aa-G 0F FURTH, GERMANY MANUFACTURE or SILVERED crass Application filed April 28, 1928, Serial No This invention relates to an apparatus for finishing silvered glass, which considerably simplifies and shortens the methods hitherto em loyed.

ccording ,to the present invention the following devices .are positioned one behind the other along a conveying arrangement: a mechanical flushing device for the silvered glass which flushes the entire breadth and both sides of the glass simultaneously, a drying device for the flushed glass, which operates with hot air under pressure, a mechanical spraying device for applying the shellac to the dried glass, a second drying device for the coating of shellac, which also operates with hot air under pressure, a second mechanical spraying device for appl ing the covering varnish and finally a thir drying device for the coating of covering varnish, also operating with hot air under pressure.

A constructional example of such an arrangement according to the present invention is illustrated, in which Fig. 1 shows the first half of the apparatus in side elevation,

Fig. 2 the second half of the apparatus in side elevation,

Fig. 3 the apparatus in cross-section on line A---A of Fig. 1 and Fig. 4 the apparatus in cross-section on line BB of Fig. 1.

In a frame 2, 3 mounted on supports 1 there are j ournalled a plurality of rotatable rollers 4, 5 and two drums 6 as carriers for an endless conveyor belt 7. The rollers 4, 5 arecovered with rubber rings 10 and at one end of each roller is mounted outside the frame 2 a small toothed wheel 8, over which an endless chain 9 runs. On the conveyor belt lies a web of thin paper 11 which travels with the blt and which unrolls from a drum 12 and winds up on a drum 13 (Fi 2). By

. 273,585, and in Germany August 11, 1925.

supply pipe 18' is .opened, jets of water are directed towards each other between the rollers 4 (Fig. 3). Between the rollers 5 the nozzles 19 of a hot air supply 20 are directed from above and below towards one another. The conveyor belt 7 is brid ed over at its front end by a stirrup 21 (Fig. 4), to which a rocking arm 22 supporting a spraying pistol 23 is suspended. From the spraying pistol 23 a flexible tube 24 leads to a container 25 in which there is liquid shellac under pressure.

Behind the stirrup 21 a second group or nozzles 26 of a hot air supply 27 is located above the conveyor band 7 and behind these nozzles 26 a second spraying device 28 with a spraying pistol 29 is provided, the flexible tube 30 of which leads to a container 31, in which is liquid covering varnish under pressure. This spraying device 28', 29 is followed by a further blast device and at the end of the conveyor device is a table 33 for receiving the finished article.

When the motor 15 is switched on the rollers 4, 5 rotate in the direction of the arrow at and the upper stretch of the conveyor belt 7 travels in the direction of the arrow 7). The web of paper 11 resting on the conveyor belt travels in the same direction and at the same speed. The silvered and flushed pieces of glass are placed on the rollers 4 or on the rubblast of hot air is blown against them on either side. After passing between the nozzles 19 the pieces of glass arrive in a completely clean and dry state on the conveyor elt 7 and under the spraying device 23.

Thereupon the shellac. is applied mechanically to the piecesof glass by means of a spraying device 23 in contradistinction to the methods hitherto employed, in which the shellac is applied with a brush. The shellac is sprayed in a thin layer on the glass by means of the spraying pistol 23 by compressed air, the glass being at the same time conveyed along by the conveyor belt. Behind the spraying device thepieces of glass travel under a second hot a1r blast devlce 26, whlch causes the shellac to dry immediately. Consequently the pieces of glass can have the covering varnish applied to them immedlately after the application of the shellac by means of the spraying device 29. Finally the pieces of glass pass under a third hot air last device 32 by which the covering varnish is also dried. At the receiving table 33 the finished pieces of glass'are removed as they arrive and are taken away to be further dealt with.

As compared with the known methods, that described abo've'has the advantage that within six minutes a piece of glass is silvered and covered with varnish, i. e. completely finished, without having to be touched by hand during the whole operation. In many cases it will be sufiicient to provide the ieces of glass with covering varnish only, a ter they have been silvered. In this case the container 25 is not filled with shellac but with covering varnish, the second spraying device 30 an the blast device 32 being put out of operation.

What I claim is;

1. An apparatus for finishing silvered glass, comprising in combination with a continuous conveying device, a mechanical flushing device capa le of covering the whole breadth and the two sides of the glass, a drying device using hot air under pressure for the flushed glass, a mechanicalspraying device for applying shellac to the dried glass and a second drying device using hot air under pressure for drying the coatin of shellac,.as and for the purpose set fort 2. An apparatus for finishing silvered glass, comprising in combination with a continuous conveying device, a mechanical flushing device capable of covering the whole breadth and the two sides of the glass, a drying device using hot air under pressure for the flushed glass, a .mechanical spra ing device for applying shellac to the drie glass, a I

second drying device using hot air under pressure for drying the coating of shellac a second mechanical spraying device for applying the covering varnish and a third drying device using hot air under pressure for drying the covering varnish, as and for the purpose set forth.

In testimony whereof I have signedmy name to this specification.

LUITPOLD OFFENBACHER.

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