US499865A - Valve mechanism for - Google Patents

Description

(No Model'.) 2 SheetsSheet 1.

v H. WARDEN. YALVE MECHANISM FOR GAS ENGINES.

No. 499,865. Patented June 20, 1893.

WHneSSeS: inventor:

2 Sheets-Sheet 2.

(No Model.)

H. WARDEN. VALVE MECHANISM FOR GAS ENGINES. No. 499,865.

' Patented June 20, 1 893 My :2 f v WH'HQS see: 5%

UNITED STATES PATENT, FFIC HENRY WARDEN, or PHILADELPHI PENNSYLVANIA 'VALVE MECHANISM. FO eAs ssemr-zs.

SPECIFICATION forming part of Letters Patent No. 499,865, dated June 20, 1893.

A pplioation filed March 9| 18933 To an whom; it: may concern:

Be it known that I, HENRY'WARDEm-OE the city and county of Philadelphia, State of Pen n sylvania, have invented a certain new and useful Improvement in Valve Mechanism for Gas-Engines and other ,Uses, of which the following is a true and exact deScrip t-idmlrefer-Q enco being had to the accompanying drawings, which form a part of this specificatioh.

My invention relates to the construction I and operation of slide'valves and their actusting devices and is especially intended and adapted for use with gasengi'ues although it can he used alsn 'with slidevalves applied to other engines or machines. v

The object of my invention is toprovide'a slide-valve with clamping mechanism which will com'e'into operation at a certain point or points in the movement of the 'valve holding it at those points tightlyto its seat with suf: ficient pressure to resist whatever tendency there may he to lift therefrom and which, during the movements of the slide valve, will release this pressure permitting the valve to slide upon its seat with'very littleresistance.

and thus at the same time economize the power required to move the valve and avoiding injurious wear to the valve and to the seat."

' Reference beingnow had "to the drawings which illustrate my.invention,-Figure 1 is a side elevation-partly in section showing one end of a gas engine cylinder 'with slide valve and clamping mechanism.- Fig. 1- is an ale 35.

vation of the mechanism'for operating the valve-rods. Fig. 2 is a similarview showing a modification. ot the clamping device; and Figs. 3 and 4 similar views illustrating ,the movement of the valve and the action of the clamping device;

A indicates the gas engine cylinder; B the piston'or plunger working'init; E the head of the cylinder the outer 'face' of which serves as the valve seat for the slide valve F.

C is a passage in the cylinder-head through which gas and air are admitted the said passage having a port 0' in the valve seat; and D is the'exhanst passage having a port D in the valve-seat. Between these two portsis 50 the port E leading to the interior of the cylinder and having preferably the conical form shown; the conical projection B" on the pis- Serial No. 384,188. (Nomodald ton is adapted to substantially fit in and fill this conically-shaped port the purpose being to expelas perfectly as possible all theprcducts of combustion from the cylinder when the piston moves back to its extremeposition. In the slide valveF ports F and F are formed and. valve-actuating mechanism as link G, heli-crank-- G, connecting-rod G, and a cam on shaft H, notshown in the drawings, are

provided to give the proper'movem'ents to the valve.

Y In an engine of the character ill nstratedin operation holding t-he'valve toits seat with v the necessary force but which, after the explosion and preferably beforethe valve moves from the position it occupies during-the ex-f plosion will release thh pressure onthe valve permitting the valve-actuating mechanism to move it without undue and unnecessary re;

sistance; that is, the valve -is permitted to move from the positiontshown in Fig. 2'to that shown in Fig. 4, then to that 'shown'in Rig: 3, and then back to the position shown inFig. 2. before the. clamp comes again into ope-ration. Referring more particularly to Fig. 1. the clamping device there ,shewn consists of a plate L pivoted at one end l'to standards K'on' the head of the cylinder and connected at the other end by means of arodP with an eccem tric Pf on shaft H; bolts M M secure-a plate M to the plate L and through a perforation in the plate Lbetve'en the bolts M a clamping head 0 extends in such way as to'rest against the valve F, a coiled spring N being held between the clamping head 0 and the plate M"; during the motion of the valve'the clamping head O rests lightly againstit or remains entirelyont tcontact with it; at the proper time, to w't,"just before the explosion and when the va ve is in the position shown,

2 J see.

5 of the spring, whichcanbe readily regulated, of course regulates the amount of pressnre exerted upon the valve; after the explosion and during the working stroke the motion of the'eccentric governing the clamping devicepfis'hesflhe' plate Laway from the valve gradually releasing the pressure upon it and at the end of the working stroke the valve-actuating mechanism moves the. valve in position. to exhaust the cylinder to' r receive a new charge and 'to close the port E before the clampagain comes into opera tion.. The importance of having aspring as N to transmit the clamping pressure to the valve is of course obvious; withoutthe use of zosome such device the clamp would have to be.

adjusted with the utmost nicetyandflconld probably not be keptin order under the exigencies of. practical use.

, I have shown alight spring I secured to standards Jon each side-of the'slidevalve (one onlyheing shown in the drawings) which always exerts a light pressure to hold the valve to its seat; this spring is entirely independent of the clamping device and does not 0 exert pressure enough to' offer any considerabl n s e. t th c aimant-attireve vet its function being merely to hold-the valve to its seat so that the. e'xplosivemixtnre, at one point and the products of combustion at another point will move through their determined paths and not escape between the valve audits seat As shown the clamp head 0 transmits itspressnre to the valve through the spring I, said spring intervening between 4 the back of the valve, and the clamp; .this

however is a purely immaterial detailot construction. 1

'Referring-now to the modification shown in I igs.'--2, 3 and 4, the clamping device here consists of 'a lever-L pivoted to standards K and having secured to its-cylinder R which extendsover the backof the valve and has a portion B of its surface planed otf flat; the lever L is actuated through a red by an 'ec 5o centric in the same way as explained as to Fig. 1. On the back of the valve F a strong 'spring'N' is secured by means of a bolt Q assing through a slot or perforation 01;. another bolt,'Q', passing through a slot n in the opposite end of the springserves to hold it in position though not to clamp itto the. back of the valve. As shown a second light spring, l', is secnredhpon the back of the valve prior to the explosionof the charge the in Figs. 3-and t' with it's fiatside R running substantially parallel to the ba'ckof the valve not against the spring N; prior to the explosion of thecha'rge, the valve being in the po+ sitioii shown in-Fig. 2, the lever L and cy'lin- ;the light spring I downiagain'st the spring N and then pressing against both springs until the force exerted is snflicient to hold the valve to its seat during the explosion, at;- her which the cylinder returns to the position shown in Figs. 3 and 4 permitting the valve R with its'fiattened side R is essentiallya cam and itwill'be obvious that any cam with proper conformation canbe usdin like manher. It is also obvious ofcourse that the position of the spring through which I conupon the v'alve,'is entirely immaterial so long as a construction is adopted .by which a yielding pressure is exerted between theclamp and the valve. 7

Having now described my invention, what I claim as new, and desire to secure by Letters '.,Rste t.i::',

l'l lhe conibin'atidn' with a valve seat, ot a slide valve adapted to move thereon, clampits seat, a spring arranged'between-thc clamping mechanism-and the valve, means for moving, the valve, and. independent meanafor actuating the clamp to release the pressure on the valve while it is moving and clamp it tight at a definite point in itspath.

v2. Thecombination with a valve seat, a valve-adapted to move thereon-and means for operating the valve, of a'clamp, means for moving the clamp so that-when moved it will hold the valve to its seat and a spring between the clamping mechanism and the valve. 3. The combination'with a valve seat, a valve adapted'to move thereon and means for operating the valve-, ot'. a spring operating to hold the alve to its seati.with a light pressure, a. clamp operating'when put in operation to bear against the-spring and hold the valve firmly to its seat and means for operating the clamp.

y HENRY WYARDEN. Witnesses:

LIsLE STOKES,

I JosHUA MATLACK, J r.v

spring N, Dnring the movements of the 'and pressing lightly against the springI. bnt a v sider it preferable that the clamp should act 7 ing mechanism arranged tohold the valve on cylinder R remains in the position indicated dcr'R are moved to the position shownin. .thatfignre, the cylinder in turning pressing to move-freely upon its seat. The cylinder

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