US569386A - Gas-engine - Google Patents

Description

3 SheetsSheet 1. P. C. OLIN. GAS ENGINE.

No Maciel.)

No.Y 569,386A

Patentedoo'c, 13, 1906' (No Model.) N 3 Sheets-Sheet 2.

C'. OLIN.

GAS ENGINE.

' No. 569,386. Patented-Det. 13, 1896.

lllllllfv 3 Sheets-.Sheet 3. P. C. OLIN. GAS ENGINE.

(Nrv'Model.)

No. 569.386. Patented Oct. 13, 1896.

Unirse STATES FRED C. OLIN', OF BUFFALO, NEW YORK.y

ef-issnelnE.

SPECIFICATION forming part of Letters Patent No. 559,386, dated October 1.898. Application filed February 11,1893. Renewed March 131896. Serial No. 583,134 (No modald To all whom it may concern:

lle it known that I, FRED C. OLIX, of luffalo, in the County of Erie and Stute of New York, have invented certain new and useful Improvements in Gas-Engines; and Ido hereb'ydeelzue the following to be n. full,elenr, und exnet description ot' the invention, sueh as will enable others skilled in the art to which it pertains to mnke and use the snlne'.

My invention relates to improvements in gas-engines, and more especially to that elnss of gnsengines wherein the expansive force of the gas netsvdireetly upon the piston und through the piston upon the other moving,r parts, und wherein ges is introduced at one induction-port and atmospheric nir :it nnother induction-port to eommingle with the gos, und wherein the mixed fluids are ignited or exploded by an electric spark, the result zo ine' combustion or dilntntion-of the gases furnishinf;r the desired motive power.

My invention consists especially in the menus employed for producing theeleetrie spnrk io explode the gnses; in the means employed for governing the speed of the engine; in the means employed for opernting the eduetion-vnlve, and in the means employed for lubricating the connection of the pistonrod with the piston and engine-shaft.

My invention also consists in certain fenv tures of construction und in combination of parts' hereinafter' described, and pointed out in the elnims, the object being;l to produce an engine that is not ouly'more economical und simple in ,eoustruetion, but that is more re- 'linble, durable, and etlieient than the engines heretofore devised.

In the neeompanying drawings, Figure 1 is n. central vertical seetion of an engine embodying my invention. imud side elevation relative to Fie. l. Fun is is nn enlarged Central vertical section of a x)ortion of the means employed for igniting the gases and of the valve mechanism for (nntrolling the supply of nir nudgns to the engine. Fig. el is :i side ele 'zrtionof n poriioi. of the menus employed for opening the eduetion- 'n.lv'e.

Referring to the drawings, A represents the upright hollow cylinder that is closed at its lupper end by meansof :i cap A', bolted to snjil end of 1ho eylinder. 'llm'eylinder is Fig. E. is a Yrig-hte.

open nt its lower end. The cylinder ,ineketed, ns nt- Ai", the nnnuln-r chamber Ztl, be tween the jacket and eus-ingr' ot the cylinder, being iilled with waiter for the port-ose el" mnintnining the eyliinler in u eompnrntirelg.' eool condition, the ports or duets for suppl y ing' the jneketnnd draining the suine being' shown in dotted lines nt Ai A, respectively', Fig. l. 'lhe jacketis prefernbly enst integral with the cylinder, nud snid .casting ni. its lower end below the cylinder terminates in legs AT, securely bolted, as :1t A", to the supporting-buse il of the engine,

(l represents the piston ihnt is ndnped to reciprocate eudwise oi.' chamber A? of the eylindex', the piston-rod if being :suiil'nbly neeured to the pistou und heilig.; operatively eonneeied, in any suitable manner, with the ern-nk d oi the main or drivingy shaftl of the engine i he piston is kept luhrieni'ed in :my

suitable munner, butprelernblu hy menus ot' an oil-cup E, loented outside. ol' the uinelzet and cylinder und communienting, by menus of :L pipe l, with the lower pori ion oi the ohunber of thouylinder. 'lhe piston is prelfernblyol' the trunk vnrieivv, und the external periphery of `the trunk is provided nt suitable intervals with eireumierentinl grooves or recesses Ui, adnpied to receive und distribute the lubricant, thereby keepin'g the piston :it nll times und nl, all ports amply lubriented. v

The pistoirrod is eonneeled with the trunk of the piston preferably ns shown in Fig. l', wherein the upper end oi' snid rod terminntes in an eye or sleeve ti, thnt easily embraces around transverse pin or member C4, suitably supported within the trunk ot'` fthe piston, member C* beingv eentrnlly und longitudinally perforated, as ntfs, 'for the reception of lubricant from the exteriorot' the piston. Passage-wey Ci", by means of n lnterni oriiee or perforation C in member Ci, communicates with the bearing nt the upperend of the pis ton-rod, thereby keeping' Suid. hearing weil lubricated. Some of the lubrienntfed to seid bearing will, however, find :unexitnt the engl of eye or sleeve Gioi.' the pistou-rod und trie-kie or iow down snid rod. i suitable menus for catching or receiving the vlubricant that thus triekles or iows down the pistou-rod, and utilize said lubricant furthe therefore provide f shaft.

is applied.

lubrication of the connection of the pistonrod with the crank of the engineshaft. A. preferable construction is shown -in Fig. l,

wherein the lower end of the piston-rod ter- 'minates in a sleeve CT, that easily embraces the' central or horizontal portion of the crank of the engine-shaft. Sleeve lCT at the top is provided with an external annular shoulder C8, that supports an upright cup or receptacle G, thron gh which the piston-rod extends. Said cup or receptacle is in open relation, by means of one or more passage-waits C9, with the bearing of sleeve C?, and hence by the construction just described it will be observed that any lubricant trickling or flowing down the pistonfrod is caught by cnp 'or receptacle G and is thence fed through passage way or ways C9 .to the bearing of theconnection of theipistomrod with the crank of theengine- I would here remark that I reserve the-m atter disclosed in the preceding paragraph for the subject-matter oi' a separate application for Letters'latent. y

Engine-shaftfhas suitable bearing in the snpportirig-baseof the machine and is lubricated in any suitable manner, but prderably, as shown in Fig. l, from oilcups H, suitably supportedandprovided' .one at yeither end of crank d; Theengine-shaft is preferably pro-4 `vided vwith two ily-wheels l and J, one at each end of the shaft, said ily-wheels being operatively mounted upon the shaft in any suitable ,mannerand the one ily-wheel l being provided with the pulley I', by which the motive power Referring next' to the means employed for supplying air and gas io the cylinder and for governing the speed of the engine, the cylinder and inclosing jacket at one 'side andat its upper end is laterally enlarged, as at a, and is provided with a lateral duct a', that extends through said lateral enlargement of the casing 'andis closed at its outer end, as will hereinafter appear. Casing a. is provided with a vertical or upright chamber a2, that l is in openfrelation with the air-induction port or opening a. (Shown more clearly in Fig. 3.) Chamber (121s adapted to communicate with duct a', and the casing of said chamber at its upper end is provided with a seat a* for a'l lower end with a chamber a in casing a, and

chamber a6 is in open relation with the gasiuduction port or opening ai. It will thus be observed that Valve L is adapted to open and close communication between gas-receiving ceases A chamber m and chamber c and that; the air and gas commingle in said lastfmentioned'` chamber. The stem L of Valve L extends downwardly through 'gas-rcceiving ,chamber rm, and is preferably made in three sections, as will hereinafter more fully appear, the up per section ofthe stemI 1 being tubular, as shown, screw-threaded internally at its lower end, as at l', and screwed onto the correspondingly externally-threaded upper end ofthe section of valve-stem next'fbelow, and also preferably secured thereto' by lmeans of a screw Z2. The stem of valve K extends downwardly centrally through chamber L? in the upper section ot the steinof the valve L and terminates in the lower portion of said charm ber. The lower'end of valvesteinl' isy ex ternally screwthreaded and has mounted thereon a nut K2, between which andA the to wall of chamber L2 is located a coil-springK conned upon the valve-stein. Spring Ksacts their proper relative position.y N represents cated preferably as shown, next below valve K. The stem of valve K is provided with external annular shoulders K4 K5, the one shoulder, Ki, abutting the underside of guide N, and the other shoulder, K5, resting upon the top of valve L when valve K is closed By the construction hcreiubefore described f it will be observed that the aetnationof valve L will necessarily accompany the actuation of valve K, except when vulve L is mechanica-ily held to its scat, as will hereinafter appear. Guide Nis'preferablyof the construction shown, the sanxecomprising an annular rim n, resting upon shoulder K4.of the Stem of valve K, and arms n', declining v,downnected at their lower and outer end bya rim n2, that engages the surrounding wall of chamber a2. By means otI this'const-ruction it ise obvious that the upwardcurrentsof air and gas, upon opening valine aridi', will strike arms 'n' of said guide" nd'be thereby directed in dinerent directions, resulting in a more thoroughly commingling of the air and gas. l

The central member of valve-stem, L'a thatis rigidly secured to the upper tubular ,heinber of said stein at itslower end, termihates, preferably, in a downwardlymapering externally-screwthreaded hollow portion l, slitted longitudinally, as' at l", and haring clamps lportion Z5 upon the upper end of the lower section '3 of the valve-stem, section 3 extending into section 2, as shown. The lower section 3 (see Fig. 1) of saidvalvestem extends downwardly, along the side of the engine into a corresponding hole d' in the adjacentfnox or bearing D of the enginesha'ft.

Referring now tothe eduction side of the engine,(see Fig. 1,) the cylinder opposite to the locationnf the air and es induction Valve casipg is laterally enlarged ,as at as, and proin the directionto retain valves K'and Lin a guide for Valve-stem K, said guide being loy wnrdly and outwardly from said-rim and-con IIO mounted thereon 'a nut Z5, that securely Y vided with a lateral duct or passageway a",

that is in open relation with the chamber of the cylinder and is adapted to communicate with an upright chamber am within casing a, said chamber al being in open relation with eduction port or pipe a. Casing as, at the upper end of chamber al, is provided with a sesta12 for a valve' O, that is adapted to open and close communicationy between duct or passage-way a and chamber al". The valvestem O' of valve O extends downwardly through chamber al and through a correspending perforation a in casing a. Upon valve-stem 0', ing as, is rigidly mounted a collar Obetween which and the adjacent end of casing aS the valve-stem has confined upon it a coilfspring O3, that acts in the direction to retain valve O in its seat. Valve-stem O at its lower end extends loosely through a guide'O, rigid with the adjacent supporting leg or member of the cylinder, and above said guide has slidablymounted thereon asleeve O, to which is pivotally secured, as at O, the arm of eccentric-strap p', that embraces eccentric p, rigid 'and preferably integral, as shown, with a spur-'gear P, thatv is pivoted, as at l, to any suitable support, such, for instance, as

' a transverse member or brace A0 of supportable material, embraces the ing legs or members A7, and meshes with a pinion D2, operatively mounted upon the engine-shaft.

By the construction just described it will be observed that sleeve O5 is elevated during each rotationy of eccentric p against rigid collar O2, thereby and thereupon elevating the valve-stem and lifiing valve O off its seat. A cushion Q, of leather, rubber, or any suitvalve-stem below collarO?, so that no appreciable noise is occasioned by the vactuation of sleeve O5 against said collar.

A cycle of the engine involves four complete strokes -of the piston.' yThe piston being at the extreme of its upstroke at the comL mencement of acycle, (bqthind'uction-valves andeduetion-valve being closed,) upon the succeeding down or drawing stroke of the pistonapartial or practical vacuum is created iii/the cylinder above the piston, creating ai suction "that will lift the inductionvalves K and L off their seats and cause the mixed air and gas tor'iioiv into the cylinder, (the eductionfvalve 0 being meanwhile held to its scat by spring O3.) The next succeeding upstroke ofv the piston (second pistonstroke in the cycle) will compress the mixed charge above the piston, whereupon by an electric spark, produced as hereinafter described, the mixed air a gases are ignited, resulting in the combustion or dilatation of the gases and in an expansive force directly upon the piston. Just at the time the piston commences the second upstroke or fourth stroke of the cycle, upon the completion of the second downward stroke or third stroke a suitable distance below cas of the cycle that immediately fellows the explosion of the charge, eduetion-valve O, by tbc mechanism hereinbefore described and operatively connected with the engineshait, 7o A is opened, sothat the exploded or dilated gases are discharged during-the fourth or'last piston-stroke of the cycle, the mechanism for opening the eduction-valve being so timed that it will time. I

The eductionvalve being required to open but once with every other rotation of the engine-shaft, it follows that the diameter of gearP of said eduetion-valve-actuating mech- 8o anism is twice that of the driving-pinion.

The simplicity and elficiency of the mechanism employed for opening the eduet-ionvalve is quite apparent.

The speed of the engine is controlled or governed by partially or entirely cutting oif the supply of gas.r Valve L, that opens and closes communicationbetween gas-receiving chamber m and air receiving and mixing chamber a2, is adapted to be held losed or 9o partially closed against any suction `created in the surrounding chamber by mechanism operatively connected with the engine-shaft. A preferable construction of said governing mechanism comprises an eccentric R, (see- Figs. l and 2,) loosely mounted upon the hub of fiy-wheel J. Said eccentric is provided with a laterally-extendin g arm R', pivoted at its outer end, as at R2, to one of the spokes or arms ot' the y-whe'el, preferably diametico rically opposite` arm R'. Said eccentric has a laterally-extending arm R, to which is attached a spring R5, the other end whereof is attached to one of the arms of the ily-wheel.

Said spring acts in the direction to retain the 1o 5 eccentric in its normal position, the eccentric -havinga laterally-extending weighted arm R rigid therewith. An eccentric-strap r embraces eccentric R and has an upwardly-extending arm r', pivotally secured at its end to a collar L3, lslidably mounted on section 3 of valve-stem L', a stiff coil-spring L4. being."

confined upon said section of the valve-stem between collar L? and any rigid member of the stem below, such, for instance, as ailever 1 i 5 L5, rigidly mounted on tliedower end of section 3 of the stem. The arrangement of parts is such that when the speed of the engineshaft becomes too great orabnormal,

Weighted arm R, by means of the centrifugal 12e force developed in the weight of said arm,

'will be moved -to shift the eccentric in the direction to movejarm r' of the eccentric-strap A to depress or hold sliding collar L3, acting upon y spring L", that in turn acts upon the stem'of 125 valve L, causing said valve to be held closed or partially closed, notwithstanding any suction created in the chamber surrounding the valve, thereby reducing or cutting oi the supply of gas until the engineshaft has again 13o attained itsnormal speed, when'the parts will automatically return to their normal position,

performits function at the proper 75 outer. u o

'valve K.

and valve L will bo released subject to the action of the suction intermittently created in the chamber siii-rounding the vulve.

- Referring lastly tol the .means employed the normal position of the same, rests and bears upon the. inner end-of a wireor rod T, that extends centrally through a screw tinto duct c. Screw extends centrally through a sleeve or annular plu i', that is scrcived into theI correspondingly-thrcaded outer end, of duet or passage-way a'. The external diameter of sleeve t is such, relative to the dialneter of screw f, as to form an annular chamber t2 between said members. Seremi/is securelyA held in place by means of a disk of insulatingmaterial i, interposed between the inner end of sleeve i and the head of screu` and by means of a diskfl of insulating material abutting annular shoulder t5, formed by the annular head i, in which theouter end of said sleeve terminates. insulating-disk t5 nicely .fits the interna-l periphery of said head and is securely held iu place against shoulder t" by means lof a nut i?, screwed onto the shank of screuj l, nut I being of such size that when secured in place it shall not `make Contact with thc head of sleeve or plug t', but shall be suificicntly separated from the same to be `electrically insulated therefrom. )Vire or rod 'lf extends centrally through said nut,and in order that said wire or member shall be rigidly held in place it-is preferably screwt-hreaded Where it. extends through the nut, as at 'l", and engages a correspondingly.` threaded perforation in said nut. 'Wire or rod 'l is thus electrically insulatedvfrom the engine, and said Wire or rod at or near its 'outer end is electrically connected, by means of \v ire,U,(secil1`igs. l and 3,) with the one termiual of a battery U, "lheother terminal of said vbattery is electrically connected,- by means of a wire U2, with a contact Us, secured to (see also Fig. 4) but insulated from, as at Uil, the supporting member of gear -P of the mechanism for opening the,ednction-valve,

and adapted to be engaged at the proper time by a revolving contact operatively. 'connected with the. engine-shaft and-,electrically connected with the engine, such, for instance, as a lug or projection P2, integral with gearP, and thereby complete the electric circuit, the complete circuit being lfrom the Y battery through Wire U2 to stationary contact U3, thence through revolving contact P2,- through the engine to ivire or rod S, and thence through insulated Wire or rod 'il and \vire U to the other terminal of the battery.

. Operatively mounted upon theA engineshai't, preferably next inside of thehub of flywheel J, is a cam disk or wheel lV, the cani or projection l uher'cof is adapted to'engagc and actuate lever lf and thereby turli valvestem L', to which wire or rod S, as already vin-A dicatcd, is 'rigidly secured, resulting inthc disconnection of members S and T,.causinga break in the electric circuit in case' the eircuit was complete and resulting in thehpro-v duction of an electric spark and in the ignition of the compressed charge of air and gases Within the cylinder; lty the construction shown members S and 'livill of course b e disconnected uith eachrotation of the engineshaft,fbut the electricv circuit, it will be observed, is only completed once ina cyclo of the engine, and the arrangement of. parts is such that the circuitis closed immediately upon thc compression of the charge Within the cylinder and just before member' S is velectrically disconnected from Vmember T.

The explosion of the mixed airand gases hav- 'ing been effected, lever L, and consequently valve-stem lo' and v"ire or rod S, are turned baclc to their normal position by the action of a coilspriug X, confined upon said stem between and secured atopposite ends to slifling collar lf" and said lever, said spring bc- -ing put under tension upon the'actuation of lever L5 by cam or cam-Wheel ll".

lVire or rod S; bearing, when the electric circuit is complete, upon insulated wire-or rod. l, as. already indicated, it follows that member S will bc electrically disconnected from member 'l with a snap, which not only insures the production of an effective spark,

but maintains the rubbingsurfaccs of said contact devices clean and polished.

Revolving contact I is adapted to become electrically disconnected from stationaryjnsulated contact Ua immediately after the production ofthe electric spark.

Lateral enlargements a and u? of the casing ofthe engine-cylinder and inclosing jacket at the top are each provided with a vertical threaded bore c",close d `bya correspoudin gl ythreaded plug Z. V-By removing said plugs access is v had to the 'valve mechanism, &c., below'. cu-liar connection of sections 2 and 3 of valvestem L', herei'nbefore described, the adjust--V ment of valve L is readily and conveniently effected. f

What I claim is-jv 1. In a gas-engine, the combination with the cy'flinder, two valve-casings rigid with each other and located the one Witliin the other, a duct or passage-Way adapted toopcn communicatiou between the chamber of the outcrvalve casing and theA chamber of the cylinder,

an air-induction port or passage-)ray opening- I would also remark that by the pep,

into the chamber of the outer-valve casing, a1

gaafinduction port or passage-Way opening,A yinto the chamber of tho inner-valve easing,

of a valve for opening and closing communication between the chamber of the outer- Valve casing and chamber of the cylinder and a valve for opening and closing communication between the chambers of the two valvecasings, the valve of the outer-valve casing having a stem extending downwardly through the inner valve, a nut or rigid member on the lower end of said valve-stem, a coil-spring mounted on the stem between said rigid member and the inner valve, and a shoulder on said valve-stem adapted to abut the top of the inner valve when the outer valve is closed, substantially as set forth.

2. ln a gas-engine, the combination with the cylinder, two valve-casings rigid with each other and located the one within the other, a d uct or passage-way adapted to open communication between the chamber of t-he outervalve casing andthe chamber of the cylinder, an air-induction port or passage-way opening into the chamber of the outer-valve casing, a gas-induction port or passage-way opening into the chamber of the inner-valve casing, of avalve for opening and closing communication between the chamber of the outer-valve casing and chamber of the cylinder, and a valve for opening and closing communication between the chambers of the two valve-casin gs, the outer or upper valve having a downwardlyextending stem suitably connected with the lower or inner valve, a guide for said stem within the chamber of the outer-valve casing, a shoulder on the stem for supporting said guide, said guide comprising do wnwardly and outwardly inclined arms connected at their lower and outer ends by a rim engaging the surrounding wall of the chamber of the valve-casing, substantially as set forth.

3. ln a gas-en gine, the combination with the gas-induction valve, and engine-shaft, of a rotating member operatively mounted on said shaft, an eccentric loose upon the shaft and having an arm pivoted to said rotating member, a weighted arm rigid with and extending laterally of the eccentric, a spring acting in the direction to retain the eccentric in its normal position and suitable mechanism operatively connecting the aforesaid valve with the eccentric and adapted to hold the valve closed or partially closed, the arrangement of parts being such that when the speed of the engine-shaft becomes too great or abnormal the centrifugal force developed in the aforesaid weight shall shift the eccentric against the action of the aforesaid spring, and cause the aforesaid valve-holding mechanism to perform its function, substantially as set forth. v

4. In a gas-en gine, the combination with the cylinder, valve-casing rigid with the cylinder,

gas-induction port or passage-way opening into the chamber of said valve-casing, said chamber being adapted to communicate with the chamber of the cylinder, and a valve for opening and closing said communication, said valve being adapted to be opened by the suction created by a vacuum `or partial vacuum in the cylinder, and having a stem extending outwardlythrough the valve-casing, of the cn gin e-shaft, a fl y-wheel operatively mounted on said shaft, an eccentric loosely embracing the engine-shaft or hub of the fly-wheel, and having a laterally-extending arm pivoted to one of the spokes or arms of the fly-wheel, a weighted arm rigid with and extending laterally of the eccentric, a spring acting to retain the eccentric in a concentric position, an eccentric-strap embracing the eccentric and connected with the aforesaid valve-stem in such a manner, and the arrangement of parts being such, that when the speed of the engine-shaft becomes abnormal or too great said valve shall positively be held closed or partially closed until normal speed of the shaft is again attained, substantially as set forth.

5. ln a gas-engine, the combination with an upright cylinder a valve-casing rigid with said cylinder, a gas-induction port or passageway opening into the chamber of said valvecasing, said chamber being adapted to communicate with the chamber of the cylinder, and a valve for opening and closing said communication, said valve being adapted to be opened by suction created by a vacuum or partial vacuum in the cylinder, and having a stem extending downwardly through the valve-casing, of the en gine-shaft, a iiy-wheel operatively mounted on said shaft, an eccentric mounted on the hub of said wheel and having a laterally-extending arm pivoted to one of the spokes or arms of the iiy-wheel, a weighted arm rigid with and extending laterally of the eccentric, a spring acting to retain the eccentric in its normal position, an eccentric-strap embracing the eccentric and connected with the aforesaid valve-stem in such a manner and the arrangement of parts being such that when the speed of the engine-shaft becomes abnormal or too great the aforesaid valve shall be positivelyV held closed or partially closed until normal speed again obtains, substantially as set forth.

6. In a gas-en gine, the combination with the gas-induction valve and valve-Casin g,the stem of the valve extending outwardly through the valve-casing, a sliding sleeve or collar on said stem, fixed member on the stem outside of said collar and a coil-spring suitably mounted on the stem between said fixed member and sliding member, of the engine-shaft, a flywheel operatively mounted on the shaft, an eccentric loosely mounted on the shaft or iiywheel hub and having a laterally-extending arm pivotally connected with the ily-wheel, a weighted arm rigid with and extending laterally of the eccentric, a spring acting to retain the eccentric in its normal position, an eccentric-strap embracing said eccentric and pivotally connected with the aforesaid sliding member on the valve-stein, the arrangement of parts being substantially as and for the purpose set fort-h.

7. In a gas-engine, the gas-induction valve IOO e' cease@ having a 'stein composedof three sections,the lower section, at its upper end, extendinginto a corresponding hole in the outer end of the central section and said portion of the central section being tapering outwardly, externally screw-threaded, and engaged by a correspondingly-threaded nut securely clamping said section onto the lower section, substantially as set forth.

8. In a gas-engine, the combination with the cylinder, two valVe-casings rigid with the cylinder and located the Vone Within the other, an air-induction port communicating with the chamber of the outer-Valve casing, a gas-induction port communicating with the chamber of the inner-Valve casing, a Valve for opening and closing communication between J[he chambers of said Valve-casings, a duct or passageway, a, closed at the outer end and adapted to establish open communication between the chamber of the outer-Valve casing and the chamber of the cylinder, and a valve for opening and closing said communication, said valves being suitably connected with each other and adapted to be opened by suction created by a Vacuum or partial Vacuum formed Within the cylinder, of an insulated conducting piece or member extending into said duet and supported by but insulated from the engine, and electrically connected or 3c adapted to be electrically connected with the j?" one terminal of an electric battery, a non-in.- sulated conducting piece electrically con-V nected with the engine, extending into the aforesaid duct, terminating, Within said duct,' in a laterally-extending member adapted to bear upon the inner end of the aforesaid insulated conducting-piece, and being rigidly secured to the stem of one of the aforesaid Valves, the engine forming part or being 4c adapted to form a part of the electric circuit, suitable means for actuating said'valve-steni to cause the non-insulated conducting-piece to become electrically disconnected from the insulated conducting-piece, engine-shaft and. I. suitable means operatively connected with Y said shaft for turning said stem in the one!" direction and suitable means for turning said stem in the opposite direction, the parts being *Y arranged substantially as and for the purpose 5f set forth. f

In testimony whereof I sign this specification, in the presence of two Witnesses, this 22d day of December, 1892.

FRED C. OLIN.

Vit-nesses E. TV. BARTHOLOMEW, A. G. BARTHoLoMEW.

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