US1542191A - Mold box for block presses - Google Patents

Description

June 16, 1925. v J. VAN HLLEN nloLn sox Fon BLOCK PRESSES Filed Oct. 1'7, 1924 mv, ------.U fr C i cnA Patented June 16, 1925.

UNITED STATES PATENT OFFICE.

JOSEF VAN HLLEN, OF CREFELD, GERMANY.

MOLD BOX FORBLOCK PRESSES.

Application filed October 17, 1924. Serial No. 744,192.

` lowing is a specification.

This invention relates to a mold for celluloid block presses. In order to facilitate the ejection of the celluloid blocks which after th-e pressing adhere strongly to the mold walls, or in order to eect this ejecting with less pressure than usually the pressing faces are formed, according to the inventi-on, of conical plates which bear during the pressing against the also conical inner walls of the mold and form a pressing space ofplane faces. These heatable plates rest during the pressing with their lower edges on shoulders of the mold faces and at the ejecting of the pressed blocks they are lifted together with said blocks Vby the adhesion action until their projections butt against abu'tments of the molds. Owingrto the conical shape of the pressing plates a fre-e space is formed at the raising of said plates between said plates and the walls of the mold so that, after having arrived at their extreme position, they can give way in lateral direction and drop back into the initial position, the released Celluloid block being then completely removed from the mold. This arrangement.presents an advantage in so far as only the comparatively thin platesneed be heated, while in the commonly used constructions, the considerably thicker walls of the mold have to be heated. The mold box used may be in one part or composed of several parts. j

An embodiment of the invention is shown on the accompanying drawing in which a mold box composed of four part/s is shown by way of example.

Fig. 1 is a plan view of the mold top of a block press.

Fig. 2 is a section on line AMA, and Fig. 3 is a section on line B-B of Fig. 1.

The mold box of the block press is composed of four walls a, b, c, d held together by screw bolts e. The inner edges of the ribs f extend feebly conically. The conical plates g bear against these edges so that the inner space formed by the same is enclosed by vertical faces. The plates g are connected with one another at the edges by tongueand-groove connection and they have inner channels i for the heating medium. The lower edges of the plates g rest normally on shoulders of the walls of the mold box. J'lIhe plates g have projections m on the outer races.

If after the pressing the compress-ed material is ejected in the direction of the arrow I the plates g are lifted also yowing 'to the adhesion which exists between them and the f compressed material, until the projections m strike against the abutments n. in 'the walls of the mold box. Between the walls of the mold box and the plates g a free space is formed owing to the conical shape of the plates s-o that after the plates have arrived at their extreme position they can give way in lateral direction and drop back onto the shoulders e. The compressed material is then ejected without any lateral friction.

I claim 1. A mold box for block presses comprising in combination with the box proper having conical inner walls, conical heatable plates bearing against said conical inner walls of the mold box so that an inner space is formed enclosed by vertical faces, projections on said conical plates, and abutments von the inner walls of the mold box frr limiting the movability of said heatable p ates.

2. A mold box for block presses comprising in combination with the box proper having conical inner walls, conical heatable platesy bearing against said conical inner walls of the mold box so that an inner space is formed enclosed by vertical faces, groove-and-tongue connections between the adjacent edges of 'said heatable plates, projections on said conical plates, and abut-ments on the inner walls of the mold box for limiting the movability of`said heatable plates.

3. A mold box for block presses comprising in combination with the boxV proper having conical inner walls, shoulders on the inner walls of said mold box, conical heatable plates bearing against said conical inner walls of the mold box so that an inner space is formed enclosed by vertical faces, the lower edges of said plates resting normally on `said shoulders of the mold box, projections on said conical plates, and abutments on the inner walls of the mold box for limit.- ing the movability of said heatable plates.

4. A mold box for block presses comprising in combination with the box proper Walls of the mold box for limiting the movalmving conical inne-r Walls, ,conical liezitnble bility oi 'said -heatable ,pla-tes. 10 plates bearing against said eonieafl vinner In testimony whereof I zii'lix my signature walls of the mold box so that an inner space ill PTG'SGIICE 0f 21 WDQSS.

is formed enclosed` b f .vertical faces and having inner chzinnels5 for the pzrssage of JOSEF VAN HLLEN the heating medium, projections Qn seid- Vi'tness:

conical plates, and abutments on 'the inner M. Form.

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