US881191A - Valve. - Google Patents

Description

v No.ss1,191. I PATENTED MAR.1o,19oa.

' J. D. MAULAGHLAN.

' VALVE. l

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metal for the formation-of valve disks.

lbar of steel, an the head yUNITEDsrirrns PATENT OFFICE..

JOHN D. MACLACHLAN, OF DETROIT, MICHIGAN,"A SSIGNOR'TO' DETROIT-STEAMv ENGINE COMPANY, OF DETROIT, MICHIGAN,l A CORPORATION OF MICHIGAN.

` VALVE.

No. 881, 191. Specification o To alljwhom it 'may concern: A

Be 1t known that I, JOHN D. MAoLAonLAN,

`acitizen of the United States of America, 4residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Valves. of which the following is a specification, reference being had therein' to the accompanying drawin s. f

The invention relates to valves more particularly designed for use in engines.

It is the object of the inventionI to obtain a construction having a cast metal head, and wrought -metal stem integrally united to each other.

To this end, the invention consists in the peculiar construction as hereinafter set forth.

In the drawings, Figure 1 is a central longitudinal section through the valve and stem. Figs. 2,-l3, '4, and ,5 show various modificatlons.

In the present state of the art, it has been found that cast'metal is preferable to wrought n the other hand, the valve stems are better where formed of wrought metal. Cast metal disks have been united to wrought metal stems by mechanicaljoints, but this necessitates machining the parts, and adds to the cost of the construction. With the present invention, a composite construction of cast disk and wrought stem is obtained, in which the parts are united without machining, so as to be incapable of displacement.

As shown in Fig. 1, A is the stem and B the head, or disk of thevalve. The stem A is formed of wrou ht metal, referably around is united to the stem by being cast thereupon. Disengagement between the parts is prevented by an interlocking joint, which, in Fig."1 is formed by cuttin the grooves a. in the stem, `which are lled y the castmetal. The other end of the stem pro'ects slightly beyond the disk, and is provide with anv end cross'slot b for .the engagement of-a screw driver or other tool, by which the valve may be rotated to bring it to its-seat.

In casting `a head B about the stem, the opllration may be performed so as to either l the casting in contact withthe stem, or

f Letters Patent.

n 4Application led April 23, 1906, Serial No. 313,283, v

Patented 10, 1908.

mold so that a considerable quantity o the molten metal is caused to ilow by the stem,

Vto burn it on, that is, by constructin the before solidifying. In the latter case, the

metal of the stem is raised to approximately the tem erature of the molten metal before it solid' es, with the result that the metal is not chilled. When the parts are united in either way. above mentioned, the union is such that a head cannot be displaced without.:

breaking.

In Figs. 2, 3, 4, 'and 5, otherA means for` l' uniting the cast and wrought metals from that shownl in Fig. 1 are illustrated. I'n v2 the stem is bored with one or more apertures c, preferably two bores at right an'gles to each other. This will permit the `cast metal to form keys passing through the stem. In Fig. 3, pins are inserted in bores in the stem, and project out beyond the same, so as to be embedded in the ca st metal.

In Fig. 4, the other end of the `vstem` is.y threaded, and the metal cast thereabout,

Where the cast metal is burned" upon the stem, it will remain soft, so as to permit of machining. Furthermore, this process integrates the two Vmetals by fusion together of the contacting surfaces. Thus, the parts being in molecular contact, there is' .no danger of loosening through vibration, as is the case Where the joint is a mechanical one.

What I claim as my invention is:

1. A valve comprising an integrated cast metal head and wrought metal stem.

2. A valve comprising a cast metal head on which the valveface is formed, and va Wrought metal stem, said head being cast upon said stemand integrated therewith, and being in an unchilled condition.

3. A valve comprising a stem of wrought met'al, a head cast thereabout and integral therewith the end of said stem, projecting said stem, so as to iill said grooves, and surrounding the intermediate portion of the larger diameter, said head being integral with said stem.

5.- A Valve comprising a stem of wrought -5 metal," and a head east thereabout and "bur-ned thereupon substantially as and for the purpose described. 6. A valve comprising a steni of Wrought gm lnetal having a portion thereof fashioned to increase the surface, and a cast metal head 10' surrounding said fashioned portion and integrated therewith.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN D. MAOLACHLAN.

Witnesses :r`

JAMES P. BARRY, EDWARD A. COBB.

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