US1628573A - Method and mold for casting type bars - Google Patents

Description

y lo w. M. BowER ET AL METHOD AND MOLD FOR CASTING TYPE BARS Filed Oct. 20. 1924 ff 5 i Juventa/m MM@ wc Patented May 10, 1927.

UNITED STATES 1,628,573 PATENT OFFICE.

WILLIAM MORRIS BOWIER, CHARLES SAMIBROOK BURDON. AND CARL LOUIS STERN. F LONDON, ENGLAND, ASSIGNORS TO LINOTYPE AND MACHINERY LIMITED, OF LONDON, ENGLAND, A BRITISH COMPANY.

METHOD AND MOLD FOR CASTING TYPE BARS.

Application led October 20, 1924, Serial No. 744,566, and in Great Britain October 22, 1923.

This invention relates to the molds of typographical line casting machines tor producing the larger sizes oi slugs such as carry display laces or characters and for economy of metal, are of hollow or cellular formation.

lleretofore dillicultyhas been experienced in producing these slugs with satisfactory printing faces, and oi' sutlicient rigidity tc withstand the rreat pressure to which they are exposed when used in a printing press or for making stereotype matrices from dry lon s.

The defective printing faces are believed to be largely attributable to the molten metal in the molds becoming chilled before all parts of the matrix cavities are flooded. with such metal, and, so far as regards the absence ot' rigidity, this is due to the fact that the feet of the slugs or the upright members or walls of said slugs do not furnish a sup port Which is adequate to prevent distortion under the above mentioned pressure.

According to the present invention the aforesaid diiiiculty is entirely overcome by causing the molten metal to be injected into the mold through two sets of jets extending continuously throughout the length oi' the mold cavity so that the introduction of the metal takes place in the shortest possible time.

In the accompanying drawings the invention is illustrated in connection with a mold of the general construction employed in machilies known commercially under the trade mark Linotype,

Figure l being a front elevation of the mold with the present improvements applied thereto; l

Figure 2 an end elevation oi the mold;

Figure 3 a plan of the improved core, and

Figures 4 and 5 respectively an elevation and sectional view of the slug produced according to the invention.

The mold comprises, as ordinarily, a mold body l, and a mold cap 2 held to the body by screws 3, the cap and body being A separated so as to form the mold slot 4, by

a pair of liners 5.

In order to form the cells in the slug body, according to the present invention, a core G is provided in the mold slot 4. This core 6 is supported on each liner .3, beneath a filling piece l which completes the closure of the space between the liner 5 and the mold cap 2, and is secured in place bv the screws 3 passing through holes 8 in the` core.

As shown particularly in Figure the core has notches 9 in the edge which is presented towards the front of the mold. It

- cated to the rear of the front of the mold slot, while the opposite or rear edge is flush With the rear edge of that slot. The rear portion olf the mold slot 4 is'thus divided into upper and lower sections :for forming the upright members or walls l() (Figure 5) of the slug, While the front portion of the mold slot remains clear for the formation oit the character-bearing shelf ll. A

When casting the improved slug according to the present invention the front oi' the mold slot is closed, as ordinarily, by the composed line of matrices, and metal is injected into both the upper and lower sections at the rear of the mold cavity thus formed, through two jets, or tivo series of jets, extending along the Whole length oi' that cavity, so that the introduction oi the metal takes place in the shortest possible time.

By these means the metal reaches the matrix cavities uniformly throughout the length of the mold, and equally at the top and bottom of the mold cavity, with the result that the metal in said matrix cavities also cools oil' uniformly, producing on solidifieation a smooth and unbleniished printing surface l2. Moreover, as the feet ot' the two lon itudinal upright Walls l0 or the slug body are both in the same plane throu hout their entire length and extend from oot to shoulder, these Walls l() `form a rigid support for the printing face through out its entire length so that the latter cannot be distorted by any pressure which it may be subjected toin the printing press or in the process of stereotype production. The slug is further strengthened by the intermediate transverse Walls 13 formed by the notches 9 of the core 6.

It will be recognized that liners 5 and filling pieces 7 of different dimensions may be employed in conjunction with the core 6, and be interchanged to enable slugs oi correspondingly different lengths or body clmenso's to be enst,

Having described our invention? wu Cioclare that what We claim and (Ivsro lo scclnfe Letters Patent isz l. Tl'lonlotllocl of casting slugs or lypo bars of hollow 'lorn'lalllon7 which consists :in providing a cored mold presenting lwo tions in which the side Walls of th sll'lgs new lll Cast, anclminjelilng mollen umlnl 'mls mllx 2. The method of casting slugs or type hairs of hollow lorinallioln w'lrll ^onslsls inz'fnjovlling- :L 'cored molli ln'osonl'lng two sgr-.lions in which the sld@ walls of tho slugs :ni cst, 11nd knjqctlx'ubf moll'on lnotal into both of said sections snnlltaneously n sep-

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