US1626854A - Mold for slug-casting machines - Google Patents

Description

'May 3 1927.

` 1,626,854 i R.v R. MEAD MOLD FOR SLUG CASTING MACHINES Filed Nov. 1'7, 1926 IZ 1729.1. B i* `m 33 B2 l fr 3 i* *mi LT- vlilh m" V Hh '"uumul lluullll l "muuu INPI Hh Ihr. I/

Patented May 3, 1927.

UNI-TED sTATes 1,626,854 PATENTv OFFICE.

RICHARD RUSSELL MEAD, 0F BROOKLYN, NEW YORK, ASSIGNOR TO MERGENTHALR LINOTYPE COMPANY,;A CORPORATION 0F NEW YORK.

`MOLD ron sLUG-onsrnve MACHINES.

' Application ledNovember 17, 1926, Serial No. 148,811.

My invention relates to typographical casting machines, suchv as linotype machines of the general organization represented in the United States patent to O. Mergeir thaler No. 436,532, wherein a melting pot is arranged to deliver molten metal into a slotted mold and' up against a composed line of matrices to produce a type-bar or slug bearing on its edge type characters corresponding to the intaglio characters of the matrices. As these molds are usually constructed', the side walls of the mold slot or cavity are formed by .a bottom or body portion and. an upper or cap portion, while the end walls are formed by two end portions or liners held in place between the body and the cap portions. y y

In the manufacturer of the mold parts', which are made of steel, it is essential to harden them or at least those portions which form the mold cavity, in order to avoid the adherence of molten metal to the mold surfaces as well as to resist wear upon said sur* faces during the ejection of the cast slugs. This hardening' processl necessarilyv sets up internal stresses in the metal and frequently gives rise to warping or distortion lof the casting surfaces when the mold is in use. `To overcome these difficulties, `the cap and body portions of the mold, as disclosed in my prior Letters Patent No` 1,569,386, have each been made in two separate sectionsinstead of in` one integral piece, the inner or base sections which' constitute the side walls proper of the mold cavity being made ofl hardened steel and the outer sections which act' as reinforcements being made ofv unhardened steel. vVhile this' principle is readily applicable to molds of large size, such as those ofy the 42cm variety,

other diiiculties have been encountered in the endeavor to apply it to molds of smaller' size, such as those of the standard SO-em variety. In other words, the amount or dis tribution of the metal in these smaller molds is such that, in making the cap portion in two sections, the unhardened steel reinforcing member, in order to be long enough and heavy enough to have thev proper strength, would leave the hardened steel base section too thin to properly accommodate the threads of the clamping screws and still present an unbroken slug formingsurface.

The present invention is intended to rem- .edy this condition and contemplates a construction of the parts which will permit the cap portion to be made in two separate sections screwed togetherin the desired manner, without regard to the thicknessv (or thinness) of the inner' base section. To this end, the inner-base section of the mold cap, in thelpreferred embodiment illustrated,- is provided on its out-er face with internally threaded projections to receive the threaded portions of the clamping screws, and the outer reinforcing section is formed with correspon-ding recesses to accommodate said projections so as to permit the two sections to be clampedtogether in contacting relation.

In the accompanying drawings, I have sho-wn my invention merely in preferred forni and by way of example and as applied to a: particular type of mold, but obviously many variations and .alterations may be made therein and in its mode of application which will still be comprised within its spirit. It should, therefore, beunderstood that do not wish to limit myself to any specific form or embodiment except in so far as such limitations are specified in the claims.

Referring to the drawings:

Fig; l is a front elevation of a S0-ein mold embodying my improvement;

Fig. 2 is a transverse" section taken on line 2-2 of Fig. 1;

Fig. 3 is a perspective View of the reinforcing meinber detached; and

Fig. 4f is a similar view of the base portion.

The' present improvement is herein shown as applied to a .standard 3G-em mold of the unrecesse'd type, although it is equally applicable to molds of larger or .smaller sizes of the recessed or unrecessed variety. Gen erally speaking, the mold comprises the body A, the cap B and the intermediate liners C', D; these parts being held together in assembled relation by posts'lll rising from the` body A and engaging in notches formed in the opposite ends of the cap B. The mold f body A is ofy usual construction and common to molds of the unrecessed type. The cap Bl on the other` hand, while identical in shape and .size to caps ordinarily used, is made up of an inner hardened steel base portion B1 Yconstituting the upper side wall of the mold cavity and an outer unhardened steel reinforcing member B2, the twosecltl lions being clan'iped together by means of screws B3. By constructing the cap in this composite fashion, the hardened steel base portion B1 may be of substantially uniform thickness and cross-section, and hence the internal stresses set up in the hardening process will be materially less and not so liable to canse warping during the slug casting periods. The reinforcing member B2, while irregular l in form and much heavier than the relatively thin base portion B1, is not subject to warping since it is unhardened, and consequently when secured to said portion B1 will serve as a rigid support thereflfor and maintain it in proper shape. So far as described, the parts may be the same as those presented in my previous patent before mentioned and in themselves constitute no part of this invention.

'lhe gist of my present invention lies in the manner of attaching the relatively thin base portion Bl to the heavier reinforcing member B2. lt will be noted according to Fig. Il, which is a true full-size elevation of the ordinary unreccssed S30-em mold, that the two sections B1, B2 of the cap could not be properly fastened together by the clamping screws B3 in the customary way unless the thickness of the base portion B1 were subs'antiall \,Y increased to accommodate the threaded portions of the screws B3. rlhis, of course, would be impractical, because in that event the reinforcing member would have to be correspondingly reduced in thickness and hence would not only lack sufficient strength but, on account of its contour, would be too short to serve in the manner required, it being understood, in this connection, that the over-all dimensions of the mold mustbe preserved in order to permit its application to commercial machines. These difiiculties, according to my invention, are obviated by forming the base portion B1 with studs or projections Bt, and the reinforci member with corresponding recesses B5. lfhe projections B4 afford the additional stock required to receive the clamping screws B, and the recesses B5, which are arranged to accommodate the projections, permit the two sections of the cap to be brought together in contacting relation. lt will also be noted that suflicient clearance is allowed around the projections to insure a machined lit between the base portion Bl and its reinforcing member B2 and at the same time obviate close workmanship that might otherwise be required.

While my invention is herein illustrated iu prefered form, it will be understood that iinany changes and variations may be made therein without departure from its scope. For example, it might be desirable to provide the additional metal required by the clamping screws in the form of a tongue extending longitudinally of the base porextent the area of its supporting surface.

Moreover, it is obvious that the invention could, if desired, be applied to the body A as well as the cap B, but in the .standard 30-em molds now in use such change is not regarded as necessary, .since the cross-section thereof is more uniform than that of the cap and the warping tendencies not so great. ln short, as previously stated, l .do not wish to limit myself to any specific form or embodiment except in so far as such limitations are specified in the appended claims.

Having thus described my invention, its construction and mode of operation, what I claim and desire to secure by Letters Patent of the United States, is as follows:

l. A slug casting mold presenting a side wall made up of an inner hardened steel base portion provided with a raised part or projection, and an outer unhardened steel reinforcing portion formed with a corresponding recess to accommodate said raised part or projection, and means engaging the raised part or proj ect-ion for clamping the two portions together.

2. A slug casting mold presenting a side wall made up of an inner hardened steel base portion provided on its outer face and throughout its length with a plurality of threaded projections, and an outer unhardened steel reinforcing portion formed with corresponding recesses arranged to accommodate said projections, and clamping screws passing through the reinforcing portion and having a threaded engagement with the projections of the base portion for securing the two portions together.

3. A mold cap comprising a hardened steel base portion and an unhardened steel reinforcing member, the former being formed with projections and the latter with corresponding recesses to receive them, and screws having a threaded engagement with said projections for clamping the reinforcing member and base portion together.

Li. A mold cap comprising a hardened steel base portion, an unhardened steel reinforcing member, and means for clamping said elements together, said means including a pro jection formed on the base portion and a corresponding recess formed in the reinforcing member for the accon'nnodation of the projection.

5. A mold side wall con'iprising a solid or unrecessed, relatively thin, hardened steel base portion and an unhardened steel reinforcing member, screws for clamping said member to the base portion, and threaded projections formed on said base portion to receive the clamping screws.

(3. A mold cap for an unrecessed mold lill) comprising` a relatively thin hardened steel base portion formed with projections, an unhardened steel reinforcing' member formed with corresponding recesses arranged to accommodate the projections, and clamping screws having a threaded engagement with the projections for clamping the reinforcing member and base portion together.

7. The unrecessed mold cap B comprising the hardened steel hase portion B1 having the projecting` studs BJ the unhardened steel reinforeingmember B2 formed with the recesses B arranged to accommodate the studs B4, and the screws BS engaging the studs and clamping said reinforcing member and base portion together.

8. An improvement in the method of manufacturing' mold side walls formed in two sections secured togetherl by clamping screws, which consists in forming the inner base section with threaded projections to receive the screWs,` and the outer reinforcing sect-ion with recesses to accommodate the projections.

j In testimony whereof, I have aiiiXed my signature hereto.

RICHARD RUSSELL MEAD.

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