US5254A - Safety apparatus for steam-boilers - Google Patents

Description

l'UNITED sTATEs PATENT TrMo. CLARK, or NEW HAVEN. CONNECTICUT.

SAFETY APPARATUS FOR STEAll/[g-BOILERS.

Specification forming part of Letters Patent No. :5,254, vdated August 21, 1847gReissued August 4in connecting an elastic metallic or other suitable elastic vessel with the steam boiler by means of a tube, and loading the lever which presses upon the elastic vessel so as exactly to balance the desired pressure of the steam in the boiler; then if t-he steam in the boiler increases beyond that pressure, it 'expands the elastic vessel and raises the lever, which closes the draft, in part, or entirely,l according to the amount of the increased pressure, and as the pressure of the steam is decreased, by dampening the fire, (by the want of draft,). the elastic ves-y sel contracts, and the Weight depresses the lever, and opens the draft; so that the pres` sure of the steam in the boiler remains uniformly of the same pressure, for all practical purposes.

To enableothers, skilled in the art, to construct and use my improvement, I will proceed to give a full description of Vits con-v struction and operation, reference being had to the accompanying drawings, which make part of this specification, in which- Figure 1 is a perspective view of the whole apparatus, combined and ready for attaching to the steam boiler by the tube K. Fig. 2, is a perspective view of the elastic metallic vessel, which, when in use,fis inclosed in the movable case A, Fig. 1. Fig. 3, is a direct view of a section ofthe elastic vessel, tube, case, bearer &c, exhibiting the internal structure of the elastic vessel, and how it is inclosed &c.

The elastic vessel Fig. 2, is made of sheet brass, tinned iron, or any other suitable material, capable of being made air-tight, and of suiiicient expansion for the use intended,

with a perforation at the bottom, which eX-' tends to all of the several apartments of the vessel, as seen at M, Fig. 3, thus allowing the pressure of the steam from the boiler, through the tube, K, to act with equal pressure upon all parts of the yinternal surface of the vessel and kthereby expand the vessel upward toact upon the lever,'D, Fig. 1, by meansof 'the upright shaft, or column, C, Figs. 1 and 3. Themetallic elastic ves'- sel is made by locking and soldering vor otherwise firmly uniting, `the outer edges of the first and second plates, L, Fig. 3, and the inner edges of the second and vthird plates, at their junction with the'aperture, M, Fig. 3, and so on, alternately, until the vessel Ais of the required capacity leavingy the upper plate Lwhole, to sustain the pressure, as seen at L, Fig. 2.y The elastic vessel is .placed in a metallic, or other suitable case, (as seenfat cv, a, FigQS) open atthe top, and with an aperture at the Vbottom t6 admit thetube, K, This case is placed on the projectingy part, z', F igs. l and"3,`-0f-the frame, I, I, I,'I,' Fig. 1, orsustained in any other suitable way a bearer of wood or other suitable material is laid upon lthetop of the elastic vessel within this case as seen at b, Fig. 3, on which the outside'case,`/A, Fig. 1, and A, A, A Fig. 3, rests. This outside case, (A, Fig. 1,) is made open at the bottom and closed at the top, (A,`A,A, Fig. 3,) and shuts down over the inner case, (a, c, Fig. 3,)-as seen at A, Fig. 1, and se: curesy the elastic vessel from dust, and all other external injuries, or impediments. The circular partv of this outside case is extended, as vseen at A, A, Fig. 3, to steady the circular cap-piece, VB, Figs. 1 and 13, which is the foot of the uprightshaft, or column, C, Figs. l, and 3, the top of which acts against and raises the lever, D, Fig. 1, when lthe `elastic vessel is expanded by `the increased pressure of the steam coming from the boiler, through the tube K. A weight,

ai, Fig. 1, is to be suspended from the lever D, Fig. 1, sufficient to balance the required pressure of the steam, *which may be adjust- I Athe boiler is greater than is required, it

expands the elasticv vessel upward, which,

by means' of the upright shaft, or column C, Fig. 1, raises thek lever D, Fig. `1, and a1- lows-the opposite end of the lever F, Fig.

l, to descend and close, (the damper in the chimney, or,)A thergate II, Fig. l, which regulates the wind from the blower, in part, or entirely, as is necessary, and in proportion to the increase of the pressure in the boiler beyond what is required; and when the pressure of the steam decrease, by therwant of draft, the elast-ic vessel contracts and allows the lever D, to descend, and by means of the connecting rod E, and the lever F, to open the (damper or) gate H, to the necessary extent. The lever F, may be used or vdispensed with according to the situation of the damper, or gate,` or addition levers may be added, or the levers changed in direction, or arranged or connected in any way which may be found most convenient in each particular case.

The tube K, must be connected with the boiler in some convenient way so asto communicate with theinside of the boiler.

When the whole apparatus is thus con-l nected, the steam, vafter once attaining the required pressure, and the wieght d, being properly adjusted on the lever D, will continue uniformly at that pressure while suiiicient fuel is used.

When the blower is worked by a separate engine the lever F, Fig. l, may be madeto operate on` the throttle valve of the blower-engine, and thereby lessen the force of the blower; or it maybe used in any case, to act on the tightener of the. belt of the blower, so that when the pressure of the steam in the boiler is greater than is required, the belt will'be slackened, and allowed to slip on the pulley, and thus drive the blower with less velocity, and when the pressure of the steam again decreases the belt ofthe blower will be` tightened, and the blower willbe driven with greater velocity; so that the fire which generates lthe steam is governed by the steam it generates; and thereby aY uniform pressure is preserved; thev whole apparatus being a complete'self regulator. l i,

When the steam is not wanted for constant use, (as whenv it it not used during the'nighg) but it is desirablevto keep up steam readyfor use; the Weight d, can be so adjusted on the lever D, Fig. 1, as to keep the steam at a less, but yet uniform pressure for any length of time, and be always ready for use when wanted, by re-adjusting the weight. v

The advantages of` my improvement over all other methods, now used, consists, (in part,) in 'its capability` of keeping the pressure of the steam in theboiler uniform, by regulating the draft, or the force of the blower, (as the case may be,) by the pressureV of the steam, or, making it a self regulator. Also in its extreme cheapness, and simplicity of construction and application; and thel very small space it occupies, as the outside case of the elastic vessel need not be larger than three inches in diameter, and two inches high.

I am aware that the dampersfor steam boilers have been operated bythe pressure of the steam by means of pistons in various ways, and therefore I do notl claim the opening and closing of the dampers by the pressure of the steam by means of'pistons; but

What I doclaim as my invention and desire to secure by Letters Patent, is

The application of4 an elastic vessel substantially such as herein described, instead of the piston, whereby the friction of the piston is avoided, and the operation on the damper is rendered much more uniform;

the whole constructed and operating sub` stantially as herein described.

. Y i TIMOTHY CLARK.

i Witnesses:

WILLARD LYON,

R. FITZGERALD.'

[Fnzs'r PRINTED 1913.]

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