US900340A - Apparatus for electroplating. - Google Patents

Description

I v 3 ,1 APPARATUS ron ELEGTROPLATING.

@mmnm nu]: Nov. 8., 1906.

PaltentedOct. 6,1908.

; Maggie;

To all whom it may concern: q

Beit known that'I," Jon'N "A. YUNCK, a citizen of the United States of America, and a resident of South "Qrange,"county of Essex, and State of New Jersey, have invented cerparatus for Electroplating, of which the folow1ng 1s a specification. I My invention relates. to processes of elecgenera and more specifically consists of an -1mproved a 'paratus for depositing a pro- "tecting' she of copper over afilm of silver prev ously deposited upon glass, and my in' ventlon finds 1ts.most useful application in incandescent electric lamp globe which has been previously covered with a film of silver for the purpose of producing a reflector for thelight. Y.

Heretofore, it has been customary to silver a portion of the surface of the globe of an incandescent electric lamp in order to produce a reflector of the light and-t0 protect said 1' when the lamp is lighted, the heat'of the lamp causes the varnish to curl up and it pulls the silver from the glass, destroying the reflecting powers thereof and so on, permitting the -cinclined surface, of the g ass tendsto tear off the. previously deposited film' of silver. I

" have invented a form of anode and arrange- ,mentthereof which avoids all these i d1ffi o I tion through the sleeve 8 to the metallic cup 'cultiesl- 1 The best form of apparatus" embodying f my invention at present known to me is illustrated. in the accompanying sheet of- Y Figure 1 is a perspective view ofthe -or- ,dinary electro'lating-bath,w1th my mvention a plied t ereto. Fig.2 is an enlarged '1' side e evation of an electric lamp with my- .fifiqlinv'ention in operative relation thereto,

drawings in which:

shown in partial section.

pe'clfication of Letters Paar. n ma November ,a, 1906-. serial No. 342,493.

tain new and, useful Improvements in Aptro deposition of metals, orelectroplating in copper plating a portion of the surface of an' film of silver with a coating of varnish, but

scorn ORANGE, NEW milis y; revs roe mmonium.

r treat-ea ocfc. 6,1908.

Throughout the drawings, like reference figures indicate like parts. p v

. 1 is the ordinary trough containing "the electroplating solution.

2 is a support for and conductor of current to, "a series of anodes. 3 is a similar support for, and conductor of current to, a series of cathodes to each of which an electr1c lamp'4 may be'connected; The anode consists of a cast plate or block 5 ofchemically pure copper, free from blow holes, such as is produced'by 'rocess covered by Letters Patent of the nited States N 0. 825,100, granted to me July 3, 1906. This anode has its operative face 6 so shaped as to conform to the surface of the object to be plated, in this case a portion of the surface .of the bulb ofthe lamp 4. The lamp 4 has a previously deposited film of silver 7 covering a portion ofits surface, and this film of silver is connected to the negative pole or cathode in any convenient manner, preferably by means of the sleeve 8, of copper or othenconductin metal, Which surrounds the stem of the amp and reaches from the film 7 up to the metallic cup 9, which forms the termination of the cathode, or negative -pole,-and which has a threaded socket adapted to receive the threaded base 10 of the lamp. I .The 0 eration'of my invention is as follows: Thero s 2 and 3 being connected to-the proper terminals of an electric circuit, including a source of current, not shown, and the trough -1 being filled with any copper plating solution, preferably a simple solution of sulfate of copper, lamps, are screwed into the cup-shaped cavities 9, and together with the series of anodes '5 are immersed in the solution; The current being turned on, the usual electrolytic action takes place, consisting of thetransference of a, series of molecules of copper from the solution and from the anode 5 to the surface of the silver film 7, which has become the cathode by-virtue of its connecfrom any point of the silver filmto thenear est point of the anode issubstantlafllythe. 11 0 same for every portion of. the silver surface, I

the electrical resistance'is the same at all points and there is no tendency to produce a a ieavie'r' deposition of co per at any one point than at anyv other. T e result is an even deposition of copper producing a shell of 'even'th'ickness throughout covering and pro-- testing the silver film. As the particles of copper strike the surface always squarely at right an ice, thereis no tendency for the same to islodge or displace the particles of silver and the integrity of the film of silver is therefore preserved. The result is a durable, strong protectin shell of copper formed over an undisturbed m of silver, which produces a powerful reflector that will last as long as the lamp itself lasts.

. It is evldent, of course, that the principle of m invention'co'uld beapplied to the elec-l trop ating of other objects having curved or irr ular surfaces, and that it can be applied to t e electrpiplating of other articles of glass coated with lms of silver, so long as the anodes are made to have their operative faces conform to the surfaces to be plated, and are so located thatthe shortest distance between the anode and cathode will be approximately equal for all points.

' Having, therefore, described my invention, I claim:

The combination with an ectroplating bath and circuit connections, of a cathode or negative pole adapted to hold an incandescent electric lamp, and an anode having its October 1906.

' JOHN A. YUNOK. Witnesses:

A. PARKER-SMITH, M. G. CRAWFORD.

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