US531392A - George h - Google Patents

Description

' (No Model.)

G; f1.1". SCHRAER sa H; P. KRAFT.

VALVE.

Patented Dec. 25, 1894.

` No. V524,392.`

Y F/G. 2.

INVE NTORS z il. w

:WITNESSES:

UNITED* STATES .PATENT OFFICE.

GEORGE F. SCI-IRADER AND HENRY PHILLIP KRAFT, OF'NEW YORK, N. Y.;

` SAID. KRAFT ASSIGNOR TO SAID SCHRADER.

VALVE.

SPECIFICATION forming part of Letters Patent No. 531,392, dated December 25, 1894.

Appiicati'on'iea June s, 1394..Y

DER and HENRY PHILLIP KRAFT, citizens of Y the United States, residing in the city, county,

and State of New York, have jointly'invented certain new and useful `Improvements in Valves, of which the following is a specica' tion. l

This invention relatesl most particularly to ,valves for pneumatic tires.

Our invention aims to provide a valve stem and head in-which the washerl will-'be maintained rmly in position against either dis'l tortion or escape and without injurious compression, and such a stem 'and head which can be constructed easily and economicallyon the most diminutive scale required.

To this end in carrying out the preferred form of the invention we construct the stem and head as will be hereinafter described.

In the accompanying drawings Figure 1 is an axial section of a tire valve supplied with our improved stem. Fig. 2 is a similar view' showing the parts in the open position and the stem 'in elevation. Fig. 3 is aview of the stem, cup and washer separated. Fig. 4.

is an axial section of-a modified construction of valve provided with our improvements. Fig. 5 is an elevation ofthe stem and an axiall section of the head and cup showing a modication in their construction, and Fig. 6 is an axial' section showing `another modification. Referring to Figs. 1to 3 inclusive let A represent the tubular valve body; B, the seat thereof; C, the inner valve chamber thereof; D, the valve stem ;-E, the`valve proper or head; 1

` F, the Washer; G', the spring beneath the head;

H, the bottom plug; I, the mouth or inlet duct of the valve; J, the nut engaging the stem K, the washer therefor, and L the outer face of the bodyAagainst which this washer bears. According to the preferred form of our in'- vention the stem and head are constructed as shown in Figs. 1, 2 and 3, the stem con-l sisting of a plain cylindrical body a, passing through the throat b of the seat B, a screw threaded outer end c, a recessed innerend d, asquare shoulder e between this recess and the portion a, a cylindrical enlargement f at bottompfgthe recess b, a wide iiat face g beserial No. 513,278. (No man neath this enlargement, and a solid body h, preferably coned on its under face beneath the face g and constituting the lower' end of the stem vand-the backingof the head. The headv consistsof the lower end of the stem, and a cup shaped washer i fixed thereon. This Washer z' hasw a central perforation or aperture j preferably cylindrical and fitting over the enlargement f of the stem, al Hat annular bottom Zc surrounding this aperture, and an annularvertical flange Z united to the bottom by a curve m. The bottom la of the 'cup seats on the face g, and then is fixed thereto by swaging or upsetting the enlargenient f over on the inner face of the bottom. This preferably makes an air tight, permanent and rigid connection between the cup and body h. The Iiange Z is preferably cylndricaI, and whenthe cup is xed tothe -stern this liange is nearly flush with the' top face of the washer F, and in the same plane l,with the shoulder e, as shown. Preferably the stemand the body h are formed on a single integral spindle. I i When the cup and stem are fixed together,

as shown in Fig. 1, they constitute a stern and head having an annular. washer chamber M,

the bottom of which is composed of the overset top of the enlargement f, the adjacent eX-: y 48o posed top face of the bottom lcofthecup, and the inner annular face of theflangeZ, for the outer side and bottom walls ofthe 'compartf inent, the shoulder e for the top of the com., partment, and the cylindrical wall of the re- I duced portion d of the stem for the inner wall of the compartment. Into this compartment the washer F, which is a cylindrical disk of IOO tween the stem and the flange, and this portion is engaged by the seat Bwhen the'valve is closed.

In operation the washer is compressed by the seat into the chamber M when the valve is drawn tight, and makes a tight joint with the seat and with the interior of the chamber, but is prevented from becoming distorted. When the valve is open the washer resumes its normal position. If the rubber adheres to the brass seat after prolonged closure, it will be separated therefrom by the shoulder e when the valve opens. Should a washer become worn out it can be picked out of the compartment by any suitable tool and a new one substituted.

In theconst-ruction of stems and heads of the character described the parts are so exceedingly small that itis impracticable to construct a one piece stem and piston in which the compartment M is turned out, and hence heretofore it has been necessary to dispense either with the central recess and shoulder or with the external flange.

Our invention permits the easy and economical construction of a stem and head having these advantageous features. The stem can be readily turned to the contour shown, and any drawn or stamped metal cup applied to it. The upsetting of the two metals to fix them together is easily accomplished. In the construction shown in Fig. 3 this is done by placing a punch against the enlargement f and striking it down thereon with sufficient force to cause the metal to flow over the adjacent portion of the cup.

It will be understood that the invention is not limited to the particular construction set forth as the preferred form, nor to any special construction of valve. On the contrary the two parts composing the stem and head may be variously disposed as circumstances suggest, and the device as a whole may be employed with any valve. I

Fig. 4 shows a dilferent construction of valve in which the shell lettered A has a riveted cross bar H maintaining the spring Gl, and a modified construction of nut lettered K is fixed to the stem lettered D by an enlargement N formed on the head of the latter. The other parts are substantially identical to those previously described.

Fig. 5 shows a stem and head in which the stem lettered D has a still further reduced end n below its recess d, and the head lettered E is of turned metal having integral flange f and a downwardly tapering body h', the latter having an axial hole o through which the end n of the stem passes, and at the bottom of which it is riveted to lock the parts together.

Fig. 6 shows a stein lettered D3 having-beneath its recess d a conical body h3 and an enlarged end p, and the cup lettered t" consists of a separate piece of thin drawn metal having a cylindrical flange f3 at the top and a tapering body q which is spun in against the tapering body of the stem and held thereon by the enlargement p.

Either of these constructions are effective to provide a two piece stem and head having a washer compartmentwith side flanges and a top shoulderin which the Washer can be properly held.

What we claim isl. In a valve, a shell having anannular valve seat., a throat above said seat, and a chamber beneath said seat, in combination with a valve proper consisting of a stem having a screwthreaded outer end, a reduced portion inwardly of said seat, a shoulder between its screw threaded end and said reduced portion, an enlarged body beneath said reduced portion having a tapering under face at bottom, and an annular flange at top surrounding said reduced portion, a packing washer within said flange embracing the reduced portion of said stem beneath the shoulder of the latter and engaging said seat when the valve is closed, and a nut screwing on the end of said stem embracing the exterior of said shell and drawing said washer against said seat to close the valve, all combined and arranged substantially as and for the purpose set forth.

2. In a valve, a shell having au annular valve seat, a contracted throat therethrough, and an enlarged chamber at the inner side of said seat, in combination witha valve proper consisting of a stem and head, said stem having a screwthreaded outer end projecting through and beyond said throat, a reduced portion at the inner side of said seat, a shoulder between said reduced portion and its screwthreaded end, and an enlarged body at its inner end beyond said reduced portion and within said chamber, said stem and body all formed in one integral piece, a sheet metal annular flange seated on and carried by said body opposite said reduced portion, and an annular packing washer embracing the reduced portion of said stem bearing against the enlarged body thereof, embraced externally by said sheet metal flange, and engaging said sheet when the valve is closed, and a nut screwing on the end of said stem engaging the exterior of said casing and holding said valve proper seatedwhen the valve is closed, all combined and arranged substantially as and for the purpose set forth.

3. In a valve, a casing having an annular seat, a contracted throat, and an enlarged chamber, in combination with a valve proper consisting of a stem and head, said stem having an outer screwthreaded end projecting through said throat, a reduced portion at the inner side of said throat, a shoulder between said reduced portion and outer end, an annular enlargement having an overhanging flange at the inner end of said reduced portion, and a body at the inner end of said enlargement, all formed in one integral piece, a cup-shaped sheet met-al piece embracing said enlargement beneath the overhan ging flange thereof,

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seating on said body and having an 'annular iiange opposite said reduced portion of said stem, and an annular packing Washer embracing said reduced portion within theiange Yof said cup-shaped piece and engaging said seat, and' a nut screwing on the end of said stem and engaging the exterior of said shell for holding the valve closed, all combined and arranged substantially as and for the purpose set 4forth.

4. A valve stem and head consisting of the stem D of turned metal having a screwthreaded end c, shoulder @reduced recess d,

enlargement f, top face g and body h, and aV metal cup t' having an aperture j fitting over vsaid enlargement, a bottom k engaging said face, and annular iange Z opposite said recess d, said enlargement overhanging said cup and thereby fixing it in position', and a rubber washer seated in said recess and within' said ze flange.

In witness whereof We have hereunto signed our names in the presence of two subscribing witnesses.

cEoRGE H. E. soHRADER. HENRY PHILLIP KRAFT.

Witnesses:

GEORGE HrFRAsER, f THOMAS H. WALLACE.

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