US90318A - Smith - Google Patents

Description

the molds to be Aopened. by the springs I I 'when the castings are to be discharged. These recesses begin with abrupt shoulders 7L', to permit the molds to open suddenly, and they converge, so as to conduct the friction-rollers gradually up to the parallel parts of the housings H. n l

The reservoir for molten metal consists of a cylinder, J, provided with a piston, K, as described in Michael Smit-hs patent, hereinbefore referred to. The nozzle L of the cylinder J passes into a mouth-piece or guard-plate, M, which serves to close the gates of the molds, and is rigidlyr attached to or forms a part of the bed N, which supports the cylinder J. The bed N is adapted to slide, and is held up toits work by a screw, O, and spring P, so that underl the ordinary Working of the machine the gates will be tightly closed, so as to prevent any escape of metal from the molds until it is firmly set; butin the event of a fragment of metal or other matter passing between the.

periphery ofthe wheel and the guard-plate M, the latter will yield, and thus avoid injury to the apparatus.

It R represent the tapering partitions hetween the gates F ot' the molds F. The said partitions converge to edges, so as to but momentary obstruction in passing the nozzle L, and to impart a funnel shape to the gates or sprues. r

V Operation.

. faces with a suitable nonconducting paste and filling them with molten metal, the nozzle L being closed with clay to prevent the escape of metal.

lThe cylinder J being placed in the position shown in the drawings, the wheel B is set in motion, and then pressure is applied to the piston K, so as to cause a continuous discharge of molten metal through the nozzle L. The small clay plug or stopper in the nozzle, being driven out with. the first discharge ci' metal, may pass into one of the molds and cause the production of a single imperfect casting, but after this a continuous jet of pure molten metal is kept up. The metal is thus injectedand compressed into each mold as thc rapid rotation of the Wheel carries it in front ot' the nozzle.

The guard-plate M prevents the escape of any of the metal until it has had time to become set, and as the bearing-rollers Gr of. each mold reach the shoulders IL of the recesses h the springs I cause the mold-plates to separate instantaneously with a concussion, v`hich discharges the casting from the mold; or, it the jar should be insufficient, the driving of the pins f inward through the mold-plates insures the detachment of thc casting.

The continued rotation oi' thc Wheel carries the rollers up the converging` faces ot' the recesses l1. until they pass between the parallel faces of the housings H, so as to effect the tight reclosure of the mold in readiness for` filling. For casting articles of larger weight than a quarter ot' a pound, the motion ot' the` wheel may preferably be intermittent instead of continuous.

vHaving thus described my invention, the

following is what I claim new and desire to secure by Letters Iatcnt:

1. The arrangement of a series of hinged metallic mold-plates radially around the periphery of a revolving Wheel or cylinder, so as to admit of injecting the iiuid ni'etal at the periphery of the wheel and (lisc`.arging lthe castings automatically, substantially as set forth. v y

2. The gates F', so constructed as to form between them Wedge-shaped partitions, sul siantially as and for the purposes described.

3. Y'Ihe mouth-piece or guardplate M, operating substantially as described, in combinaA tion with the series of molds F, passing in succession an injecting-vessel, in the manner and for `the purposes stated.

4., The combination of the separate inject ing-vessel, having a non-conducting detachable lining, with the series of molds F F i?, passing in succession the mouth or opening for the emission of iluid metal, from the said injecting-vessel, substantially in thc manner described.

l l v JOHN .30s. Cline. SMITH.

Witnesses:

@agravios Karene', WM. il. Banner-0N, in

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