US102304A - Improvement in molds for stereotypes - Google Patents

Description

ilnitrxl (gist-ra @wat (Itjijlw.

Moerman NELSON,

or NnWYoRK, N. .Y.

Letters Patent No. 102,304, dated April 26 1870.: antedaterl April 18,1870.

vIMPRovsimian* m'monns ron STERQTYPBS.

The ahedule referred to in than Lettori Paten: and making part of the laine.

To all whom it may concern.: i

Be it known that I, Moarmnn NELSON, of. the city and Stateof New York, have invented'and made a. new and useful Improvement in Molds for Stereof f types; and I do hereby declare the following to be.- a

full, clear, and exact vdescription of tbe nature ofthe said'invention, reference being had to the annexed Y drawing making part of this specification, wherein- 'L Figure 1 is a section showing the form of types and Vthe manner of taking the impression or mold. Figure 2 isa partial vertical section, and

IFigure 3, a sectional planof ,the mold employed by I accomplish these objects by the use of a woven or knitted fabric coated with a composition impressed' fgnpon tbe types to produce the matrix, and I then. inf sert the same ina mold provided with non-conducting material, so that the metal does not chill, butperi'ectly fills the interstices of the matrix.

I make use of a fabric such as Canton-flannel, and coat the same with a composition, either by a brush or 'by dipping, the former preferred. The composition enters into the surface, and the projecting fibers become the means for holding all particles ofthe com-v position, so that the matrix will 'separate fromv the types and none of the pieces of the szrompostionlI-emain upon upon'the surface of the types. Y

The composition I employ is madel of Paris white, well boiled our paste mixed to the consistency of cream, and the white of an egg, introduced into about five pounds of such composition; the same is thoroughly mixed and applied as aforesaid, and allowed to dry, or nearly so.' f

NVhen the matrix is to be made the sheet should be' damp; this may be effected by the use ot' a sponge, and water applied to the back of the fabric. I also prefer to rub plnmbago upon the surface of the fabric prepared as aforesaid.

. .lhe matrix is made by laying a piece of said fabric upon theface of the types, then a sheet of India rubber or other elastic mateiial, and subjecting the same to pressure in a suitable press, which indent-s the fabric between the types and ltakes a perfect impression of the faces of the types, inthe composition upon the surface of said fabric.

ashows the types; b, the sheet of prepared fabric; c, the sheet of India rubber; and

d, the pressfollower, or platen.V

. After the fabric 'hasbeen pressed' upon the types, the matrix is to be dried by a heated plate or sad-iron passed over the back surface; the matrix may then v be removed and it .will be found to 'separate freely and perfectly from the facesof'the types. I remark that the faces of the types should be oiled, as,.usual, previous to pressing the sheet of prepared fabricupon them.

In places where there are blank spaces between the or a strip lof thick-paper, .ora piece of such thick paper, to prevent the pressure of the melted metal forcblank spaces. v

The mold in which the stereotype is cast is formed of the plates ,fand g; the:p1ate f is fitted with hinged clamps h, thatcan 'be swung around to clamp the plate g, and the plate g is beveled, as seen in fig. 2, to

. form a mouth for receiving the melted metal.

The plates fand g, but especiallythe plate g, should be kept heated, and upon this the stereotype-matrix b is laid, and upon the edges of'it a frame of pasteboard, t', is placed, of a size to surround three sides responding to the thickness' of vthe stereotype-plate.

The platefis lined with a sheet of pasteboard or similar non-conductor k,`in order that the type-metal, when poured in between the matrix b and sheet k, may remain in a fluid state and not quickly become chilled or set; thereby a perfect cast will be obtained.

The edges of the stereotype-plate will require to be sawed off, as usual. stereotypes made in this manner are very perfect, and'require little or no pickingjor chiseling.

The types are not injured, as frequently happens in the ordinary way of forming the matrix; very little vtime is required, andthe matrix can be laid aside for lfuture use or reference if necessary.

ployed in forming the matrix, the same being pasted together before or during the .process of forming the .matr-ix. I claim as 1nyinveut1on f A sheet of woven material, such as Oauton-iiannel, prepared by a coating upon its surface, for use in making stereotype-molds by pressure,- the said coating forming the surface of the matrix, and that isvprevented from separating bythe bers of the woven fab- `ric running throughout the composition, as set forth.

In witness whereof, I-have hereunto set myl signature this 29th day of July, A.'D. 1869.

' M. NELSON. Witnesses:

' Geo. BENNETT WALKER,

Gao. T, PlNcKNEY.

-lines or sections of types, I prefer tointroduce a eord ing.the fabric back near the middle of these large ,v

o f the page or column-matrix, and of 'a thickness cor-y I am aware that sheets `of paper liavc been emv

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