US77986A - A donibam kendall - Google Patents

Description

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Lata-s Paantlvo. 77,986, ma May 19, 186s.

IMPROVEMENT Illl GUT-OFPVAIIVBYGEAR. x

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To ALL'WHOM IT MAY GONCERN:

. Be it known that I, ADONIRAM I ENDALL, of Buffalo, in the county of Eric, and State of New York., have l invented certain new and useful Improvements` in Steam-legulating and Out-off Valves; and I do hereby declare that the following is a full and complete description of the same, rcference'being hadto the accompanying drawings making a part of this specification, in 'which- Figure 1, plated, is a front view with the .valve closed.

Figures 2 and 3 are front views with `the valve open.

Figure 4 is a detached view.`

Figure 5, plate 2, is a top view.`

Figures 6 and 7 are inside views. t

Figure 8 is a transverse section Figures 9 and 10 detached'yiews of the valve.

Figure 11, a detached section.p 'i

Like letters of reference referto like parts in tbe several views.

I am aware that oscillating circular' steam-valve s have been used, and operated by pawls and levers, as described in the patent of R. Sanderson and others, butwhich I do not claim. That which distinguishes my invention from all othersis as hereinafter described.l 4

A, iig;1, is a valvechamber,in -which a valve hereafter described' is located, and of which B C are the steam-pipes. I), iig. 4, is a rockfshaft projected through, said chamber, and to which thc valve referred to is Iattached, and by which it is operated by the vibrator E, Iig. 1.

To the upper arms F of this vibrator are 'pivoted pawlsG, which are made to engage thelug H, andthereby operate the valve, as will hereafter be shown. Immediately back of the pawls isarranged a pair of levers, I, the lower ends of which arepivoted to tbe chamber. vThe upper or free cnds'aro made to slant upward `to a point X,.as shown in iig. 4, thereby forming a'- pair of inclined planes upward from the p'ivoted ends.

These levers I are connected to a lever, J, by a pair of links, K, fig; 4 and by which th'e said levers I are operated as and for a purpose presently shown. Immediately behird the levers I is a lever, L, pivoted, `at the point, X, ,to the valve-chamber, and connected to the lever J by a link, M, iig. 2, the two being operated conjointly, as will hereafter be shown. Il, tig. 9, plate 2, is the valve above referred to. This valve, as will be seen, is

circular in form, with deep, square openings or ports O cut in the periphery. In the edge of this valve is a deep, ,i

groove or channel,

The position of the valve when in place is shown in fig. 8, in which it'will 'be seen that it is enclosed on the sides' by the walls Q Q', which. areV providedwith ports R, iig. 6, correspcndingin number, shape, and size, to`

the ports O, in the valve. S,iigs. 'and 7, are arms projecting from the end of the rock-shaft.4 To the extreme ends of said arms areattached the-stops'T, the purpose of which will hereafter be shown. U is also a stop, the arms of which reach upward oneach side of the shaft D, figs. 8 and 10, plate 2 ,.and project over and rest upon thcarms S. ,u y v Having thus described the construction and arrangement of the apparatus, `the practical working of the same is as follows: i

The apparatus is placed lon the top ofv the cylinder, or in any other` desirable place in connection withtheA main steam-pipe. The lower end of the vibrator EV is attached to the eccentric,'-and is Athereby made to`vibra`te. Thus, as it is moved from the position shown irl-iig. 1 -to that shown in fig. 2, the lug H, which is connected to the rock-shaft, is engaged by the pawl G', and thereby turns the shaft, opening the ports of the valve N, as lshown in g. 6,plat 2. Through the open ports steampasses through the pipe B into the chamberA; thencethrough the walls Q Q', around the edge of the valve, along the groove P, to the lower part of the chamber; thence through the pipe C to the cylinder, as indicated by the arrows. At this time the pawl G' is disengaged from the v lug H by its being made to slide upon the levers I', which, as will be seen, throws the pawl fromthe lug, which on being released from the pawl return'simmediately tothe position shown in iig. 1, and thuscloses the ports,

shutting oii a further ingress of steam througlvthe valve. On the, reverse'action of thevibration, the lu'g Il is thrownintheopposite direction, as shown in tig; 3, thereby 'opening tlic valve as sho'wn in fig.' 7,`a dmitting steam tothecylinder throughthepoits of the valve, along around the groove in its periphery, to the'pipe @thence into the cylinder as before. The valve is'again instantly closed as beforeby the pawl G becoming d'isengaged'irom the lug, by means of the lever I, and so on alternately, the valve isvopened4 as the vibrator is moved from right to left, and from lefttoright, and at each instant closed on the pawls becoming disengaged.

i ,'This'closing of the-valve immediately on'the disengagement ofthe. lug and pawls is accomplished by the stop U and varms S, jig. 6. The lower part of said stop terminates in a stem, A', which is protruded through the Vside of the chamber in a stu'ing-box, B.' 'Now, as the shaft is made to, turn by means of thespawl and lug above described, the arms S will lift up the stop, as shown in hg. G.. On the pawlsbecoming disengaged from the lugthe pressureof the steam exerted upon the broad basepf the stop will instantly force itdown, and thereby bring the -arms S to aliorizontal position, as indicated by the. dotted line a, fitr. G, and thus close the`valve, shutting l C oh" the vsteam immediately, as each' pawl becomes disengaged from the lug.

This closing of the valve may be accomplished by the stops T, attached to the extremeend of the armsS.-

vThus the stop T, on beinglifted, asshowu iufig. 6, by turning the shaft, will,'on thediscngagement of the p-awls and lug, be forced down by th'e pressure of the steam, and thereby bring the arms-,S toss. horizontalposition as lug, be forced down in lik-e manner, cachtime closing the valve-ports.

It will be observed thatthe rock-shaft is' not of a uniform diameter, that part encircled by the wall Q', fig. 8, being somewhat less than' that encircled by the wall Q, liencethe pressure' ot' thesteam on thevalveis unequal. T0 compensate for this, a space, a.,-ig. 8, around the shaft, allows the steam t'o pressen that side oi' thevalve, and thereby equalizel the pressure, causing the valve to be equally balanced. i

- did the stop U, and so on. The stop T', bein-#lifted as shownin-iig. 7, will, en the'disen'gagement of the pawl and In order to insurea certainty in the action ofthe .pawls upon the lug, the .said pfawls are provided eachwith a dependent' tail, F",.wh ich are pressed outwardly by apin b, iig. 3, fitted lposcly4 in the ring, by which the lug H is secured lto the shaft. Theseipirns are forced outward-by aspring located at the inner end ofthe pins', or by the 'pressure of the steam admitted to'the'end of the pins by having tho rock-shaft hollow, 4with a small hole leading from the holloivY of the shaft to 'the end of the pin, and'ithus bring thestearn Ato act on thepins,

,and force them out against the tail of the pawl.

The actiony of the valvefas above described is that ofa cut-off. It will be obvious that the amount oi"steam cut o willbe in proportion tolthe throwof the'valve, as the throw of the valve depends .on the length of vibration given the lug H; hence, the further itis moved either to the rightor'to the left, tbewider the valve will be opened and the more steam cutoff, and vz'ce versc. I I

In order to produceauniformity in the supply of steam, and `thereby lproduce an equal movement of the yengine under` a variable pressureot` steani, the leverJis attached to the governor by means of; thelink M, 1.L

Now, as the lever will be drawn upward, and thereby push up the levers I furtherabovc the lug H, the result will be to'. cause the pawls`G to become sooner disengaged from-the lug for the reaso'n'tliat. they do not drop so, low against the shoulder, but are pushedbit` by the levers over which the ends G, iig. 5, slide, and ,by which the pawls are made-to disengage the lug. By this it will be evident that the higher the levers 'ane pushed up, the-less will be the vibration ot' the shaft, therefere'theopening of the valvewill be less, and thus eut oii'tbe steam. So, on the contrary, as the balls fall, the lever. J descends, and the levers I drop more-or less and allowthe pawls to :falldeeper against the shoulder of thelug, and thereby give-to it-a 'greater vibration, 'and so open the. valve, and allow. the steam 'to follow a greater distance the 'stroke of the piston, -Should the governor cease to act in consequence of accident to it, the lever L, iig. 4 1, above referred to, will be thrown upabove the apex of the levers, as shown in iig, 4, plate 1, and raise thepawl's G sufficiently to open the valve only-enough to give the engine a'lighterunning motion, and thus prevent any `breaking or injury to the engine or machinery vin consequence o f an accelerated movement that may be givento'it by the stoppingofthegovernor.

. This same result may be obtaiued'by the lever L', iig. 5, plate 2. One end ,o'f this lever is pivoted to `the chamber, from which it reaches across under the ends- G of the pawls. From the under side of this leverA proceeds astem, E', iig. 8. This stem vis fitted to and made to play in a sleeve, a', fig. 8, a detached viewv of which is shown in iig.' 2, plate 2.' In this sleeve is tteda lining or bush, c., attached to the lower end of which is a valve, 25'..I This valve closes an aperture or channel, e, fig. 2, leading from the stungfbox D', through intothe steam-chamber A. From the lining or bush to which the valve is attached proceeds an arnnf,` to the underside of the levers I 'andby whichthe valve and lever Lare operatedin the following mannerr When the governorceases to act, in consequence of 'accidentor otherwise, the lever T dr ops,'nand'bringhs down the' levers I, lso as to strike the horizontal arm f, which opens the valveb, thereby allowingsteam to vpass z into the lining 'or bush'c, under the stem E', and forces it up, thereby lifting-the leverI/ above `theapex X of the levers I, and upon which the ends G of 'the .pawls will rest disengaged fromthelug, or so muchso as to" allow the valve to operate s uliciently to givethe engines. lightfrunning motion, as did theactio'n of the lever L above described,

I am aware that cut-oli' valves have been operated bymeansof lpawls andlug, and that said pawls have been liftedlfor the purpose of regulating the vibration ofthe valve. 'In these Acases the manner of lfting'the vpawls has been bya yoke, so arranged that lthe upper end would'rece'ive the weight ofthe pawls on being pushed up for that purposei The objection to this method is that the yoke has to'be raised Vto a considerable height in order to raise the pawls; hence its eil'e'ct is not immediate, as vthe 'expansion and contraction of the governor do not act suiciently. or immediately to produce the desired result atall times;` butin the arrangement of thelevers I, it will ,be seen thatvthefree v,ends or apex X, g. 4, will move much faster and to a greater distance than the 'same would ifthe leverslwelre'u'uited at th-cpoint X, and detached from the chamber,and thenV pushed.

mess s up by the levery JI, which would beanalogousto thatoi' the yoke. By thus causirg the levers l to move faster anl further by the lever-J, amoremmediate action is obtainerlon the pawls, arid `in consequence the vulve is more sensitive to the action of lthe governor.

Bz', iig. 6, is a'slide-,valveoperated from the outside byma stem, N. In this valve are holes or portsg, asnoted by the dotted' lines in ig's. 7 and 8, correspondingirg' number and size to po'rtsvin the vulve-seat, as iiulicated by the dotted lines c. Through these ports the steam may be allowed to pass directly through the valve to the uylinf` der by passing along'the'grooves P, in the edge o'f the valve, instead of lpassing through the valve, in thwe manner as above described. t

What I claim as my improvement, and desire to secure by Letters Patent, is-- 1. The' levers I I', links K, andlever LI, aseonstr-uetedand arranged irl-combination with thepaivlsfGfls herein set forth, y

'2. Thearrangement of the levefL, in combination with the pavvls G, substantially 'as herein Elescgibetl.'v4

3. The arrangement of the oseillating-valve N and walls Q Q', as set forth. 4. The stop U or T, asconstructed'a'nd arranged in rela'tziouto` the valve N and arras S, s o as to'op'egxte said valve by the pressure f steam, substantially asset forth. o l

- ADONIRAM KENDALL.-

Witnesses: Y o l W. H. BURRIDGE, J. HLMEsL

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