US623203A

US623203A - cothias

Info

Publication number: US623203A
Authority: US
Publication date: 1899-04-18
Anticipated expiration: 1916-04-18

Description

No. 623,23. PtentedApir. la, |899.-l

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Founnms Ann Momma.

(Application med Feb. 24', 1897.) (Specimens.) l 3 Shets-Sheet l.

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No. 623,203. Patented Apr. I8, |899.'

A. F. IIIJTHIAS.A FDUNDING AND HDLDING.

(Application med Feb. 24, 1897.)

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No. 623,203. A Pmnfed Apr. |a, |s99.

A. F. coTHlAs. FUUNDING AND MQLDING.

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Imre STATES PATENT trice.

ALPHA FRANCIS COTHIAS, OF IVRY-SUR-SEINE, FRANCE.

FOUNDING AND IVIOLDING.

SPECIFICATION forming part of Letters Patent No. 623,203, dated April 18, 1899. Application ned tammy 24,1897. serai Nazagot. specimens To @ZZ wtont it uta/y concern:

Be it known that I, ALPHA FRANCIS Go- T'HIAS, of 9 Rue Victor Hugo, Ivry-sur-Seine, in the Republic of France, have invented certain new and useful Improvements in Casting, of which the following isa specification.

My invention 4relates to a method of casting, permitting the decrease of the density of the metal to be treated.

If the casting of any object is proceeded with in the ordinary and known way and the metal or composition be cast in sand or other molds by simple casting or the metal be cast under pressure in metal molds, care must be taken to avoid mixing gas, liquid, or a vapor with the metal. Care must also be taken to prevent the air in the mold forming bubbles, which in the cast piece would appear as cavities, iiaws, cracks, or fissures, which render the object brittle and destroy its' homogeneity. Now in certain cases it may be advantageous to manufacture of a given metal pieces of a homogeneous constitution and having determined dimensions, the metal being only sought after for its chemical composition and not for the more or less great cohesion of its molecules. vThis great cohesion may even appear as an inconvenience in certain applications of the metal. It the density is great, or, in other words, if tHe specific weight of the metal is high, it may be of import to reduce the density of the piece to be cast, be it for the purpose to obtain with this' particular metal an object of less weight, and therefore less expensive, or be it for the sake of giving to the said object a uniform porosity, which in certain applications might be of great advantage. This isy especially the case in the manufacture of lead for seals when used, for instance, by the customhouse officials, having to be of such dimension as determined by the regulations, While their weight is a disadvantage. 1t is the same with the plates for accumulators, which with a given thickness must present a determined surface, their volume being, in one word, their only important characteristic, while their considerable weight is rather a disadvantage. With the anodesgfor electrotyping it is also the same. The large surface alone is of importance. The densityis, on the contrary, a disadvantage.

' metal in question is lowered.

The object of my invention is a method of casting by which the density of the metal to be cast is decreased, whereby at the same time the price of the Iobjects cast from the To obtain this object, I inject during the casting into the metallic mass in fusion some drops of a suitable liquid, such as naphtha-oil, which by its vaporization and its-diffusion in the molten mass gives to the cast piece a uniform porosity and changes in a uniform way the texture ofthe metal without changing its chemical composition, the result being the diminishing of the density of the cast piece, which nevertheless preserves a homogeneous constitution` As an example, I shall describe the manufacturing after my method of sealing lead called custom-house lead and generically designated by t-he name lead for leading.

In the accompanying drawings, which illustrate vthe invention, Figure l is a plan view of an apparatus for carrying out the process. Fig. 2 is a longitudinal section on line '0o o; of Fig. l, and Fig 3 is a transverse section on line y y of Fig. 1.

In the drawings, 4 designates a tank adapted to receive or contain the molten metal and formingat its lower end a pump-cylinder terminating in a chamber 3. The pump-piston is indicated at Lhavin g a hollow center la,closed by a valve 1b and communicating when in an elevated position with the tank 4 by a transverse port 1, whereby the molten metal .flows down into the chamber. From the chamber 3 the lead is expelled by the piston operated by a suitable lever 2 through the conduit 5 into the jet piece or nozzle J, from which it flows through space 6a and orifice 6 to the moldcavity. The open side of the space 6a is closed by a plate J', which is recessed to receive the nozzle and form a snug fit. This mold has a iiXed part M, in which a cylindrical cavity M is arranged, the diameter of which corresponds to the diameter of the seals P to be cast. The mold is provided with an orice 6 for the admission of the lead and another orifice for the entry or penetration of the mand rel or punch B, which is intended to form the recess c of the lead seal. As hereinbefore stated, this mandrel or punch is coated with naphtha or other volatile fluid at the moment it penetrates into the injected molten lead,

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. the iuid being carried in a reservoir R, from Y (See Figs. 2 and 3.) The liquid covers said pin B, and its vaporization is instantaneous and takes place at the moment when the lead seal is formed. The fiuid drops through the opening t at the time when said opening is uncovered by the movement of the register 7.

The mold-recess is closed at its Lipper and lower ends at the given moment, partly owing to a register 7, carried by slide 7 a, Figs. 2 and 3, to which a lever 8 imparts an alternate motion and which covers the mold at the proper moment' and partly owing to a lower piston m, Figs. 2 and 3, which is attached to a slide 9 and the run of which can be regulated by a stop 10. This piston remains stationary during the injection of the lead and then receives an upward motion, whereby it lifts oft1 the completed lead seal as soon as the register 7 has withdrawn. Simultaneously a piston 11, also attached to slide 9, expels the surplus of lead present between the jet J and the mold. The seal P is then pushed to P by the register 7, Fig. 3, and from there on a way 12, from which it maybe removed in any manner whatever. AThe slide 'nz is held in position by an antifriction-plate 17 and clamping-bolt 1S', passing through an elongated opening in the slide and having a clamp-nut 19. The mandrel or punch B is screwed on by a screwb to a rod c, which itself is attached in a mortise of the block 15. The latter receives a reciprocating motion transmitted by a lever 16, pivoted at 17 on the frame of the machine.

The block 15 is held to the frame and guided by an antifriction-plate 15, bolt 15", and clamp-nut 15C, similar to antifriction-plate 17.

Water-runs 13 14 cool the parts of the machine which are susceptible of overheating.

In this manner I obtain a lead seal of homogeneous con stitution, of moderate and uniform porosity, and a weight which is considerably inferior to that of ordinary lead seals of equal size.

What I claim as my invention is The herein-described method of casting, consisting in injecting a body of molten metal into a suitable mold, and then introducing a small quantity of volatile iiuid into the body of the metal contained in the mold while said metal is still in a molten condition, substantially as described.

In testimony whereof I have signed my name to this specification in the presence ot Vitnesses EMILY BERT, S. MosTICKE.