US425441A - Gage-cock - Google Patents

Description

E. W. LUCE.

GGE 000K.

Patented Apr. l5, 1890.

(No Model.)

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EDVIN XV. LUCE, OF BRADFORD, PENNSYLVANIA.

GAG E-COCK.

SPECIFICATION forming part of Letters Patent No. 425,441, dated April 15, 1890.

Application filed J' une 25, 1889, Serial No. 315 ,472. (No model.)

`T0 all whom if; may concern:

Be it known that I, EDWIN W. LUCE, a citizen of the United States, residing at Bradford, in the county of McKean and State of Pennsylvania, have invented certain new and useful Improvements in Gage-Cocks; and I do 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 sa1ne,`ref erence being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Myinvention is in the nature of an improvement in a gage-cock for steam-boilers, and has for its object to generally improve this class of devices and render them more easy to clean and repair while under pressure without the necessity of cooling off the boiler so as to remove them for such purposes.

`With this object in view myinvention consists in the improved construction,arrangement, and combination of parts hereinafter fully described, and afterward specically pointed out in the claims.

I will now proceed to describe my invention, having reference to the accompanying drawings, in which- Figure l is a view showing a gage-cock constructed in accordance with my invention, the parts, except the handle, being shown in vertical section. Fig. 2 is a detail view showing the upper screw-plug and the screw-cap (which, together with the packing, form the stuing-box) in side elevation removed from the cock and slightly separated; and Fig. 3 is a detail view showing the interior mechanism of the cock, partly in section and partly in elevation, removed from the cock and slightly removed from their normal relative positions. y

Like letters of reference mark the same parts wherever they occur in the various .tigures of the drawings.

Referring to the drawings by letter, A is the body of the cock. It is provided with a screw-threaded stem B for attachment to the boiler, bored to permit the passage of the steam or water therefrom, as at C. lt is further. provided with 'the main body D, vertically bored at E, having an interior thread F at the top, another interior thread G at the bottom, and an annular inward-projecting flange Il about midway its length. E of the -body lies at a right angle to and communicates with the bore C of the stem, and is divided by the flange H into an upper chamber I and a lower chamber J. A screwplug K engages the upper thread F and has an annular flange which iits tight against the top of the body D, a packing-ring being interposed if thought desirable. This plug is centrally bored, said bore being interiorly threaded at its lower end. The upper end of this bore is larger than the rest, leaving space for a tubular gasket L, preferably of soft metal. The lower end of this space is enlarged by being angularly undercut at M, the bottom. of said under-cutbeiug inclined downward and inward, as at N. lVhen the gasket is inserted, its interior forms a continuation of the lower part of the bore, and within it is placed the stem O of a cup-shaped valve P, having 'a removable handle Q at its top. Around this valve-stein. screws a screw-cap R, having a central downward-projecting flange S, which iits into the enlarged upper partof the bore of the plug K and upon the top of the gasket L. The stem O is also bored centrally from the bottom, but partially through and a spiral or other spring T secured therein. l/Vithin this bore is also placed the upper end of the stem U of another cupshaped valve V, which has a continuation at W below the cup.

In the lower thread G of the bore E is secured a plug X, which is centrally bored at Y, and has an upward-projecting tubular yflange Z at its top. This bore is constricted at its lower end so that the lower end of the stein WV iits closely therein, while an annular chamber a is formed around the stem above. The stem lV is provided with a transverse slot b, which opens at each end into said chamber c., and communicates at its center wit-h the lower central bore c of said stem, said bore c extending to the lower end of the Stem.

An annular soft-metal gasket d, angular or L-shaped in cross-section, rests upon the upper end of plug X, and is inclosed, except its upper side, by said plug, its annular upright ange Z, and the body D, with its annular lOO inwardprojecting flange H, hereinbefore described. The exposed upper face of the ket (l forms the seat for the edge of the cupshaped valve V.

The lower end of the bored stem XV is made smaller than the main body thereof", as at e,

forming an annular inverted shoulder f.

On the side of the main body of the valve opposite to the stem B are formed two ears or lugs g, between which is pivoted a handle N, whose inner end fi rests under a projecting head j of an L-shaped bar 7c. The horizontal arm of the bar 7c passes under the main body of the cock, and is passed up over the lower end e of stem IV, resting against should er f, said lower end e passing through a hole in the said horizontal arm of the L-shaped bar 7c.v A stop l between the lugs g serves to limit the downward movement of the inner end e' of handle h.

The operation of my invention may be described as follows: The stem being screwed into the boiler, the steam therefrom will enter the chamber I through bore C. Plug K will prevent its passage therefrom upward, while the flange IfI and cup-shaped valve V will prevent its passage downward, so that there will be no escape of steam, the cup-valve V being held to its seat on gasket d by the pressure of the steam, in addition to the force of spring T on top of its stem U. If, however, the handle 7i is moved downward, its inner end t' will raise the L-shaped bar k, and this, by pushing upward on shoulder f of stem W, will raise the valve V off its seat, thus allowing the steam to escape from chamber G through slots b and bore c of stem WT to the outer air. When the handle is raised, (which will be done when it is released by the action of spring T through the medium of stem WV, shoulder f, and bar 7c,) the valve V will again rest on its seat f, thus cutting off the escape of the steam. lWhen it is desired to remove the interior parts of the cock from spring T down for repairs or replacement, the cup-valve P is screwed down until it engages the" flange H, thus effectually closing chamber I. Now, by lowering the inner end of the handle the bar 7c maybe slipped off the end e of stem W and removed. The plug X may now be removed and all the parts taken out.

The angular soft-metal gasket d, being confined on all sides by hard metal, cannot bel spread or mashed out of shape, and is also by that arrangement almost wholly protected from the destroying action of the steam or water passing through the cock.

The valve V would generally drop by gravity to its seat upon removing the upward pressure of bar 7c; but should there be any tendency to stick, the force of gravity will be supplemented by the action of spring T.

The shape of the cavity in which the sleevegasket L is confined is such that downward pressure upon its upper edge by flange S of cap R will cause its lower end to tightly inclose the stem O of valve P and thuspreserve a tight joint, while the gasket will also be prevented from spreading.

The provision of the removable handle Q permits the removal of the upper interior parts of' the cock (being plug K, gasket L, and cap R) whenever desired, which would not be possible were the handle rigidly secured to the stein. s

Having thus fully described my invention, what I claim, `and desire to secure by Letters Patent of the United States, is-

1. The combination, with the body of the cock having an annular inward-projecting flange, ofa cup-shaped valve having a bearing thereon, a'second cup-valve within the first having a bored stem projecting downward and reaching outside the cock,a screwn plug through which said stem passes, and a gasket resting upon said plug and forming a seat for the second cup-valve, as set forth.

2. The combination of the body of the valve having bored stem entering the boiler, inward-projecting fiange H, chambers E and I, and closed upper end, with cup-shaped valve V, having bored and slotted stem WV, as set forth.

3. In combination, the valve V, having bored stem communicating with chamber I when said valve is raised, the L-shaped bar 1c, having head P, and the handle h, whose inner end engages with said head, as set forth.

4. In combination with the body of the valve and its plugs K and X, the inner cupvalve, its stem, the. outer cup-valve, its stem bored to receive the stem of the inner valve, and the spring in said stern to supplement the action of gravity upon the inner valvestem, as set forth.

5. In combination, the body of the valve,

the screw-plug X in the lower end, having a' IOO bore smallerr at the bottom than the top, and

EDWIN W. LUCE. Witnesses:

M. J. Foorn, SHIPLEY 'BRAsHEARs lIO

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