US1063749A - Mold for electrotyping processes. - Google Patents

Description

APPLIUATION FILED MAR 6,'19]2 Patented June 3, 1913.

IN VENTO R JZ/ Z/z ar Jame; 712% WITNESSES ATTORNEYS UNITED ST PATENT orricn ARTHUR JAMES TIZLEY, or New Your. N. Y., AssIoNo R 'ro EDWARB r. ceLewELL 1 AND VICTOR J. VON LOSSBERG, cons'rrro'rmo THE 21mm: or E. CALDWELL 00., OF NEW YORK, N. Y.

MOLD FOB ELECTROTZPING YROCESSES.

Specification of Letters Patent.

Patented June 3, 1913.

Application filed Herc 6, 1812. Serial No. 831,915.

To all whom it may concern:

Be it known that I, ARTHUR JAMES T17.-

LEY, a 'sub'ect of the King of Great Britain,

and a reel ent of the city of New York, tier ough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Mold for an Electrotyping Process, of which the following is a full, clear, and exact description.

My invention relates to molds for use in electrotyping processes using a cyanid bath and more particularly it is directed to a new and improved mold which is unaffected by the cyanid bath or by temperature variation.

A further object,'of my invention is to provide a new and improved mold made of celluloid in a particular manner which will not warp and which will permanently retain the embodied design.

Reference is to be had to the accompanying drawings forming; part of this specific-a tion, in which similar characters of reference denote corresponding parts in all the views, and in which' Figure 1 is representative of any suitable master pattern; Fig. 2 discloses the pattern with the celluloid sheets positioned thereon, whereby the mold is formed; Fig. 3 sets forth the mold of Fig. 2 with a reinforcing element, such as wire mesh; FigJ i is the reverse side of the mold with the deposit of silver forming the pattern disclosed in Fig. 1; Fig. 5 is a vertical sectional view of the pattern with the mold adhering thereto disclosing the reinforcing mesh.

hile a particular form of pattern is dis closed in the drawings in setting forth the mode of operation of my invention, it is clear that the process disclosed is equally well adapted to different patterns and those of widely varying dimensions, the figures of such patterns being more or less intricate.

Any suitable pattern 10, such as that shown in Fig. 1, 'preferably comprises the design 11 inbas-rel ef on any suitable base 12, such master pattern being adapted for continuous use zind being made of such metal as will permitsuch repeated use. When it is desired to form a silver reproduction of the design shown in Fig. 1, a suitable mold is made in "the mann to ,be presently described. It is well (HOWII that a mold of gntta-pcrcha is not adapted for use in a cyanid bath for the reason that the guttapercha is attacked by the electrolyte after much experimentation. I have discovered that a mold made of celluloid in a particular manner particularly titted for use in such a bath or electrolyte, inasmuch as there is no chemical reaction between the substances.

he preferred method of forming the'celluloid mold may be described especially in connection with .l igs. 2 and 3. Strips of softened celluloid of required dimensions are brought into intimate contact with. the design to be reproduced, as, for example, that shown in Fig. l, the celluloid beinglworked into all tiflllivl'S of the design and being in contact therewith throughout the entire surlure: thereof so that an exact intaglio repro due-lion is secured. The celluloid mold is preferably made up of a plurality Of tllifl sheets which are suitably softened, whereby they may be \mrlccd to proper shape, the use of such material, however, demanding e suitable l'eiuforciilg element if the IIlOldlS tO retain the same dimensions under difi'erent coiulitions and is not to be distorted after being dried out, or when lying exposed to the air. I

Referring then particularly to Fig.5, the successive layers of softened celluloid are designated 13, while the reinforcing element is designated l-i,such element iie'ug preferubl wire mesh, the number of openings in \Vllltll will depend largely upon the character of the pattern to be copied, the use of such mesh providing an element which may be variously bent in order to take up varying shapes of pattern. as hown in Fig. 5, this reinforcing t'..t1'lv31ll. prefer ably positioned between the outer sideof the mold and the ll 1' sitioning of the teilllitilt. being sin-b that, while it series to nuilntuin the r ll-ape of the mold as anrntircly, it is positioned to par of the mold act as a conduc or for the current, and,tov this end that side 1 th mold which carries the design is (C'Mt'lltl with a thin layer'of lacquer acting as a vehicle for plumbago, the lacquer being pit-terribly a side, ills. exact po-' thin solution of shellac; the solution is thin in order to preserve the detail of the design, and the amount of plumbago carried thereby sufticient to cover the design to be reproduced. After the mold has been thus prepared, it is suspended in the silver plating bath which, in this instance, is the double :yanid of silver and potassium, the plate of silver being also suspended within the bath, the current being then supplied and the deposit beginning to form.

Celluloid is peculiarly fitted as a material to form the mold since it is unafl'ected by the electrolyte, it being noted, however,

i that, in order to produce the best results,

the celluloid is worked in the manner disclosed; thick sheets of celluloid are unsatisfector due to warping and shrinking; the use the wire mesh reinforcer, embedded intermediate the sides of the mold, serves to retain the shape of the same and the metal deposit thereon in the bath is an exact reproduction of the design on the master Having thus described my invention, I

claim as new, and desire to secure by Letprising a series'of superposed celluloid foils,

and a reinforcing element embodied between said foils near the face where the impression is to be formed.

2. A mold fol-the purpose described, comprising a series of superposed celluloid foils, and a metallic fabric embodied between said foils near the face where the impression is formed, said fabric being caused to follow substantially the sinuous shape. of the impression and helpto retain the shape of same in the mold.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR J AMES TIZLEY.

\Vitnesses GEO. Knoomi, L. Llvmos'ron.

Images