US499843A

US499843A - Safety-valve

Info

Publication number: US499843A
Authority: US
Publication date: 1893-06-20
Anticipated expiration: 1910-06-20

Description

(No Model.) 4 Sheets-Sheet 1.

A. .0. MEADY. SAFETY VALVE.

No. 499,843. Patented June 20, 1893.

4 Sheets-Sheet 2.

Y B w A V Y m OF A AS n d 0 M 0 W No. 499,843. Pa-tentedJune 20, 1893.

Wn EE-EEE. dd %Mw (No Model.) 4 Sheets-Sheet a.

A. G. MEADY.

SAFETY VALVE. No. 499,843.

Patented June 20, 1893.

4 Sheets-Sheet 4. A. C. MEADY.

SAFETY VALVE.

(No Mbdel.)

No. 499,843. Patented June 20, 1893.

WI THESEEE UNITE STATES- PATENT OFFICE.

ALBERTCECIL MEADY, OF SOMERVILLE, ASSIGNOR TO THE CROSBY STEAM GAGE AND VALVE COMPANY, OF BOSTON, MASSACHUSETTS.

SAFETY-VALVE.-

SPECIFICATION forming part of Letters Patent bio 499,843, dated June 20, 1893.

Application filed April 28, 1892. Serial No. 431.050- (No model.)

To all whom it may concern.-

Be it known that I, ALBERT CECIL MEADY, a citizen of the United States, residing at Somerville, in the county of Middlesex and State 5 of Massachusetts, have invented certain new and useful Improvements in Safety-Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in'the art to which it appertains to make and use the same. i

The object of the presentinvention is to produce a safety valve which shall open vertically, and the invention consists in the conr struction pointed out and claimed.

In the annexed drawings: Figure 1 represents an elevation of atwin safety valve, parts broken away. Fig. 2 is a perspective of the cams and lever connection therewith. Fig. 3

is a similar view of one of the slides. Fig. 4 is a side view of a valve provided with a modification. Fig. 5 is a perspective view of the top of such a valve.

Referring to the drawings, Figs. 1 and 2, the

2 5 letter A indicates the casing of a twin safety valve from which project the valve stems, B B, having the collars, b 1). Around the stems and between these collars are the forks, c c, of the slides, C C. These slides have the holes,

c c, and the side guides, 0 0 which latter fit into grooves in the standards, D, which have the holes, 01 d.

The letter E indicates the safety valve lever having the hub, e, with the transverse hole, 6, and the lugs, e 6 one on each side of the lever. Secured to the hub of this lever are the two cams, F and G. The cam, G, has the shaft, g, which passes loosely through the hole, e, and fits loosely into the hub,f,- of

the cam, F. These cams, F and G, have the hubs; f and g, the helicoidal projections, f g and the pintles, f 9 The several parts are put together as shown in Fig.1. The pintles, f and 9 enter the holes, 0 c, in the 5 slides, O C, the hubs, f and g, enter the holes, cl d, in the standards, D D, and the shaft, g, passes through the hub, e, and into the hub, f. Now when the lever, E, is moved, the projections,e e coming in contact with the projections, f 9 turn the cams in the standards, D D, and lifting the slides, C O, also lift the valves. The cams, F G, may be located so that the projections, f? g may be in line and the valves operated simultaneously or out of line, when one valve will be operated before the other.

In Figs. 4 and 5 are shown a modification. Here the slide, C, has a rack, 0 on the outside, and this is engaged by a sector, I-I, secured to a rock-shaft, I, held in the standards, D D, on the valve case and operated by a crank handle, K. This form of valve is moved up and down by the shaft and sector. Both forms of valves may have the usual spring to return them to their seats.

I am made aware of the United States Patent No. 395,536, granted to Henry G. Ashton January 1, 1889. In this patent is shown a safety valve which is jointed to a spindle. This spindle passes through-a vertical guide, and its upper end passes between the forks of a short lever which is hinged at one end. this construction the short lever lifts the valve by means of the spindle. This latter lever moves not in a straight line vertically, but in a circle. Hence the spindle tends to bind against the vertical guide and inust slide along the forks of the short lever. But even should it so slide, there will be always more or less of this binding.

. Having thus described my invention, what I claim is- 1. The combination of the valve stem, the slide engaging such stem; the standards in which such slide moves, and the lever passing through the standards and engaging the slide, as set forth.

2. The combination of the Valve stem, the slide engaging such stem, the standard in which such slide moves; the cam passing through the standard and having a bearing therein, such cam engaging the slide and having an operating lever, as set forth.

- The combination of a double safety valve, the slides engaging the two valve stems, the standards for these slides; two cams, each passing through a standard and having a bearing therein and engaging a slide and one lever for both cams, as set forth.

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

ALBERT CECIL MEADY.

Witnesses:

' JOSHUA H. MILLETT,

RALPH W. FOSTER.