US647355A - Valve-gear for engines. - Google Patents

Description

Patented Apr. l0, I900. J. H. ANSELL. VALVE GEAR FOR ENGINES.

(Application filed Dec. 1, 1899'.

" no Model.)

2 sheets shaet I.-

z /N VENTOH I WITNESSES No. 647,355. 'Patanied Apr. I0, 1900.

J. H. .ANSELL.

VALVE GEAR FOR ENGINES.

(Application filed Dec, 1, 1899.)

(No Model.) 3 Sheets-Sheet 2,

W/TNESSES lNVE/VTOH T A h THE "cams PSYERS 00.. PNOTQUTNQ. wnsnmu'ron. o. c.

NITED STATES PATENT ()FFICE.

J OSEPII HAMILTON ANSELL, OF FORT WASHAKIE, \VYOMING.

VALVE-G EAR FOR ENGINES.

SPECIFICATION forming part of Letters Pa ent "No. 6473355, dated April 10, 1900'.

' Application filed December 1,1899. Serial No. 7%,753. (No model.)

to the actuation of multiple rockable Valves,

and has for its object to provide a simple practical valve-gearof the character indicated which is of novel construction and adapted to operate effectively for movement I of the valves in either direction of rocking movement, and thus cause the engine to run either forward or backward, as may be desired.

The invention consists in the novel construction and combination of parts, as is hereinafter described, and defined in the append ed claims. 7

Reference is to be had to the accompanying drawings, forming a part of this specification,

2 '5 in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation showing the valve-gear adjusted to open the live-steam Valve when the piston isat the forward end of its travel. FigL'Zis a side view represent ing the relative adjustment of parts when the piston is at the opposite end of its stroke. Fig. 3 is a front end elevation of an engine having the improvements thereon. Fig. 4 is 3 5 a transverse sectional view substantially on the line 4 4 in Fig. 5. Fig. 5 is a longitudinal sectional view taken through the center of the cylinder of the engine, showing the valves and steam-ducts and the piston at the forward end of its stroke, the section being taken on the line 5 5 in Fig. 3. Fig. 6 is a partly-sectional side View of the engine-cyh inder, showing the valves in cross-section and adjusted to close the steam-ducts of the en- 43 gine; and Fig. 7 is a diagrammatic illustration of the action of the novel cam mechanism which actuates the valve-gear.

In the drawings that represent the invention and its application, 8 indicates the cylin- 5o der, and 9 the frame, of a modern steam-engine of the horizontal type. In the bore 8 of the cylinder 8 a piston 10 is held to slide and is reciprocated in the usual manner by a crank-disk 11, secured on the transverse shaft 12, held to rotate in boxes mounted on pedestals 13, positioned at the rear end of the frame 9, as indicated in Figs. 1 and 2. The cylinder side wall wherein the bore 8 is formed is preferably of considerable thickness in its upper and lower side, and above and below said thickened wall the chests 14 15 are respectively positioned. The upper chest 14 is for the reception of live steam from a steam generator through a conduit 1 6, which may be secured to the bonnet 14 of the chest 14 or be connected with the side of the cylinder 8 and intersect a steam-cavity a therein, from which a passage 17 extends to the livesteam chest 14, as indicated by dotted lines in Fig. 4.

Two similar cylindrical valves 17 18 are provided, which are located transversely of the cylinder8 in suitable bores formed in the thickened portions of the cylinder side wall, said bores cutting through the bottoms of the chests 14 15, so that the valves will be partly within said chests, as clearly shown in Figs. 4, 5, and 6, and the bodies of the valves are laterally reduced at opposite sides, as represented in said figures. The bores for the valves 17 18 are at or near the longitudinal center of the cylinder 8, and two live-steam ducts c c extend, respectively, from the front and rear ends of the cylinder-bore inside the end-closing bonnets thereon to intersect the bore for the live-steam valve 17, where it cuts through the bottom of the chest and at each side edge of said' bore, as clearly shown in Figs. 5 and 6. Two exhaust-steam ducts d d, in like manner to the ducts c c, extend from each side edge of the bore holding the exhaust-valve 18 diagonally toward the end of the cylinder-bore 8 and intersect said bore near the end walls of the cylinder. The lateral reduction of the valves 17 18 may remove about one-half of the material in each valve for a portion of its length, thus leaving the reduced portion thereof in the form of a halfcylinder in cross-section,which will adapt the flat side of each valve to be about level with the bottom of the chest in which it is located, while the cylindric side of the valve closes one or both ducts, depending upon the rocked adjustment of the valve, aswill be further explained. v

The rockable valves 17 18 are held to receive rocking movement by the means shown in Fig. 401' any other means that may be preferred, and ata corresponding end of each valve which projects outside the side wall of the cylinder a circular-edged enlargement or head-wall e is formed or aflixed thereon, as

as shown inFigs. 1 and 2. Between theparallel bars 19 a radius bar 20 is secured upon each head-wall e, the attached portion of each radius-bar extending from a'point near-the centerof a respective head-wall, andlthence projectingbeyond the peripheryof the'headwall'over one of the parallelbars 19, each radius-bar having its free portion offset, as

at g,-to-permit the parts of the radius-bars to pass over an appropriate parallel bar. On the free end of each radius-bar 20a pin h is affixed and outwardly projected,.one pin-being' lower thanrthe other one.

It will be seen that the diagonal trend of the radius-bars 20 is the same and thatthey preserve parallelism at any pointof rocking adjustment given either valve 17 18. ,Fur-

thermore, the pivotal connection of the paral-lelbars-19 with the head-walls e serves'to transmit rocking motionto thebodies ofsthe valves if either radius-bar 2O isrocked. .As the-fiat surfaces of the valves 17 18;face in opposite directions, that onthe live-steam chest 14 facing upwardly and the flat surface on the valve 17 facing downwardly, it will be apparent thata rocking action of'the livesteam valve 17, which willopen the duct 0, extending toward the forward end of; the cylinder8, will cause the exhaust-steam valve 18 to open the exhaust-steam duct d, trending from the lower chest to the rearend of peculiarly-shaped cam-block 21; and arm 22,

that has slidable engagement therewith. As

shown in Figs. .1 and2, the cam-block 2100m- ,prises an essentially-ovate plate, lwhereon a peripheralflange v is laterally formed-or secured. A transverse slot m is horizontally formed in the plate-like body of the camblock at its center of length of a width to pershaft12 bypassing it through theslot.

mit the locationof the cam-block on the cra illlze arm 22 is projected from an integral collar n, that is mounted upon the shaft 12, and secured thereto at a proper point, so that the arm will lie in the recessat one side of the cam-block afforded by the peripheral flange '5.

At the upper and lower ends of the ovate camblock 21 an indentation 0 is formed in the peripheral flange t' andis defined by flat places on the flange which produce offset shoulders or corners 0, between whichshoulders the flange i is concaved at the inner face. The distancefrom the center of the shaft 12 to the free outer end or toe of the cam 22 defines the throw or travel of the cam-block 21 .in

either direction to the front'or to the rear,

which throwis sufficient to properlymove the valves17 18. 'Upon the forward edge of the cam-block 21a rod 23 is secured at its rear end and r thence extends forwardly, passing loosely through a guide-box 24, whichprojects from the sideof the engine frame or trunk. The forward portion of the rod 23,

near'the guide-box 24, is-jointed, soas to'permit flexure of the front section23-thereof, and a hook 19, formed .on the freefront extremity of the valve-rod23, is adapted for convenient manipulation bythehandle 7' thereonjto hook itnupon. either pin h. The length .of thevalve-rod 23, 23 is-so proportioned that 'tionof the arrow (12, '(shown in1Figs.'1,.2,'and

7 ,),the,toe of. the cam-arm;22.will impinge the ,oifset shoulder 0 when theshaft isinitially moved, which will drawthe valve-rod 23 rearwardly and :dispose the :live-steam valve '17 asshown in Fig. 5, thereby opening the for wardstea'm-duct c. for transmission of steam .therethrough into the cylinder 8 in advance .of the piston 10. When thepistonis near the rear end of itsstroke, the cam-arm22 will have moved into thepositionshownin Figs. 2,.and 7 at t, thus pressing thecani-block 21 forwardly andcorrespondinglyactuating the valves 17 18 for influx and exhaust ofsteam to effect areturn ofthepiston forwardly.

In case it is desired to reverse the rotatable movement of the shaft 12 this maybe effected by changing the hook p from the upper pin it to the lower one, which will give the valves a reversed rocking movement,and thus adapt the engine town in an opposite direction from that hereinbefore. described.

It is claimed for this valve-gear that it is very simple, efficient in operation,'durable, inexpensivexto construct, and that the cam \device is quick and reliable in service.

Having 'thus described .my invention, I claimas. new-and desire tosecure by Letters Patent 1. The combination with a cylinder having a live-steam chest above the longitudinal bore thereof, and an exhaust-steam chest below said bore, of a cylindric rockable valve in each steam-chest, seated in transverse bores of the cylinder that cut through walls of said cylinder in the steam-chest, the valves having each a flat side reducing their thickness opposite the openings of their seats in the cylinder, two diagonal steam-ducts intersecting each valve-seat, and extending therefrom to intersect the longitudinal bore of the cylinder near its ends, and means to rock saidvalves.

2. In a steam-engine, the combination with a supported cylinder having the wall thereof thickened above and below the bore, a steamchest on the upper side and on the lower side of the cylinder, said cylinder being transversely bored in the thick portions of its wall to afford seats for valves, a rocker-valve for each chest, substantially cylindric at the ends and flattened between the ends, means to hold the valves in place, steam-ducts formed in the thickened portions of the cylinder side wall, two for each steam-chest, and trending from the bore of the cylinder near each end to intersect the seat of the rocker-valve in said steam-chest, of two parallel bars pivoted on the outer ends of the valves, a radius-bar secured at one end on each valve intermediately of the parallel bars, a pin on each radius-bar near its free end, a cam-block on the transverse crank-shaft of the engine, a camarm on said shaft, and a rod extending from a pin on one of

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