US1425631A - Valve-gear mechanism - Google Patents

Description

H. c cL Y. VALVE GEAR MECHANISM; APPLICATION FILED JAN. 27. 1919.

1,425, 6 3 l Patented Aug. 15, 1922. B 2 SHEETS-SHEET I.

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H. C. CLAY. VALVE GEAR MECHANISM: APPLICATION FILED JAN; 21. 1919.

Patentd Aug. 15, 1922.-

SHEETS-SHEET 2.

HARRY C. CLAY, 9F COLUMBUS. INDIANA, I

ASSIGNOR T9 EMEESON-BBANTINGHAM COMPANY, 01* ROGKEOBFD, iLLING S, A CORPGRRTIQYN 075' KLL'INOIS.

VALVE-GEAR, IiEECEANISM.

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. Specification of Letters Patent. Pgpggntgd Agg 15 1922 Application filed January 27, 1919. Serial No. 272,224.

T 0 all 1071 out may concern Be it known that 1, Hanna C. CLAY. a citi zen of the-United States, residing at Columbus, in the county of Bartholomew a nd State of Indiana, have invented certain new and useful Improvements in Valve-Gear Mech known as reversing gears The reversing gear'disclosed herein is of that type which insures that the amount of lead shall be uniform for all points of cut-oft in either direction of motion so. that the points of cut-off within the working range will bear the same relation to the stroke of the piston at both ends irrespective ot whether the crank shaft is being driven by the piston over or under; Such a valve gear mechanism is disclosed in my prior Patent No. 678,859, granted May 1%, 1901, and my present invention pertains more particularl to the means by which the valve gear mechanism is actuated and controlled and. by

which the speed of the engine is also regulated and controlled through the throttle valve.

One of the primary objects of this invention is the provision of simple and eflicicnt means by which the speed of the engine, its direction of travel and the point o'li cut-oft may all be regulated and controlled to a line degree of nicety from a single controlling lever so that theoperator may at all times have the engine under perfectcontrol and may quickly and easily change thew-peed, direction of travel or point oi cut-oil with one hand by the manipulatimior the single controlling lever.

in addition to simplicity oi? construction, etiiciency of operation and .cheapness ct manufacture, my invention embraces other objects and advantages which will be eadily appreciated by those skilled in the art as the invention is better understood by reference to the following drawings upon which one preferred embodiment of the invention is illustrated.

Referring to the drawings,-

Fig. l is a rear end elevation of equipped with my invention; Fig. 2 is .a longitudinal sectional view an engine taken substantially through the center of the engine shown in Fig. 1; and i Fig. 3 is a' fragmentary plan view showmg the limiting stops on the reversing arm. By reference to the drawings it will be observed that I have illustrated mv inven tion as applied to a doubleengine, the type illustrated being particularly adapted tor operating a hoisting winch, butit will be manifest that the invention is capable of application to any other type of steam. engine with equally favorable results. On the drawings, which illustrate the'type of engins selected for purposes of illustration,

reference character 5 indicates the engine base, Gthe steam piston valve, and 7 the cylinders. Steam is supplied from the usual boiler through a steam line 8 which is connected at 9 to the manifold 11, which, as

will be evident from Fig. 2, comprises a live steam passage 12 with whi h the pipe 8 communicates and an exhausting passage '18 communicating with a flanged fitting let to which the exhaust line may be connected in the usual manner. The'crank shatt '15 is driven from the cylinders through the usual cranks and connecting rods (not shown) and the shaft 16 upon whit-lithe winding drum of the winch is mounted is driven from the crank shaft 15 bysuitable reducinggearing. The structurethus tar described may be of any usual or preferred construction since my invention is not limited, as before stated, to

any particular type of engine.

Upon the crank shaft 15 there is mounted the'usual eccentric 17 embraced by the eccentric strap 18 having a radial arm 19. Piv- .ote'd to the outer end of the arm 19 at the point is a controlling link 22 to the outer end of which is pivoted 23 one arm oi a bell crank shaped reversing love the other arm 25 of which extenes upwardly as shown in Fig. 2. It will be manifest that by swinging the reversing armQS foiuvardly or rearwardlythe eccentric arn will be correspondingly moved r-arwardly or forwardly ith respect to its eccentric. Pivoted to the eccentric arm 19 at 26 is a link 27 pivoted at its opposite end to the arm 28. ot a bell crank lever pivoted on the engine frame at 29, the other arm 31 ofthe lever being 'pivotally connected to the outer end of a valve link 32 the opposite end of which is pivoted within thesteam chest to the cut-off and reversing stood that moving the reversin valve in the usual manner. It will be unden forvi-anlly o1" rearwardly the position of" the alvc will be changed to effectrcversal of the engine and by proper adjustment of the rcconvenient and accessible to the operator,

and suitable connections between this lever and the arm 25. From Figvl it Wlll be observed that a rock shaft 34 is mounted in suitable support or bracket-s35 so; to ex tend transversely of the engineqpreferably above the cylinders. cated yoke 36 is fixedly secured, upon this shaft and the controlling lever is pivotally mounted in, thisryolre upon fulcrum screws 87 the inner ends of which are seated in suitable sockets formed on the lever It will thus be seen that the lever: is capable of movement in two planes, that is,'it may be swung-I, about the fulcrum screws 37 longitudinally of the shaft for a purpose. which will be later described, and it may lee-swung in a plane at rigl'it angles 501 the shaft in which event the shaft: will, be rocked with the leveiysince no movement: of the-lever transversely: of the f shaft is: permitted by the lever mounting. The shaft; is

equipped with an upwardly extendingarm 38, two being shown in the presentinstance since this is adouble engine, and the upper end of this aim is connected to the reversing arm 25 by a link 39. When, therefore, the controlling lever 33is rocked forwardly or rearwardly this motion is transmitted through the link 39 tothe arm 25 and the movement is thereupon modifiedand transmitted through the valve gearmechanism to" the reversingand cut-off valve.

In order that the maximum cutoff may be established for'each direction of the ongum, I have mounted upon the reversing arm 25 aplurality of stops 41' and 42, which,

when the valve is thrown into the extreme desired positions, abut respectively againstthe engine frame to thereby limit the can tent of 'throwlof the valve and insure the maintenance of the valve iniits extreme ad justed positions.

The same controlling lever 83 isu ized to actuate the throttle valve which controls the steam supply to the "cylinder. This throttle valve ,maybe of the usual sliding" type and isindicated by reference character 43 in Figs. 1 and2. The valvestem is connected at 45. with a lever 4E6sfulcruuied atATupon'a suitable bracket 48. The up per end of the'lever isuconnected by' linlr 4L9 withvthelowerend'iof the controlling lever 33,11, ball gandflsocketjointbhbeing employedto; connect the; link to; theicontrol' At one end a. bifur ling lever so that, there will be no binding whenthis lever is swung to roclrlthe shai't 34. A. contraction s arin fii? attached at one i l s end to the IeVer iG and at its. other to a clip 58 embracing the steamline 8 tends to normally close the throttle valve so that if the operators hand should slip olfthe controlling lever the engine will be, automatically stopped. a v

It should bemanifest from the foregoing that I have provided'a system of control for a reversible steam engine in which the point of'cut-ofl and the speed of the engine as determined by the position of. the throttle valve are all coiitrolledfrom a single lever scribed one'preferred embodiment, it should so thatthe operator with his hand'on the be understood that various changesiu the size sha 3e Jro aortion and arranoement of the various parts may beresorted to with out departing from the spirit of. the inven,- tion as defined inithe following claims.

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1. The combination with athrottle valve and a valve gear mechanism including a re versing arm, of a rock shaft, a yoke fixed to the rock shaft, fulcrum screws carried by the arms of the yoke, a control lever p1v- .otally supporteduponand between said fuL crurn 3 screws to swing in a plane parallel with the :LXlS of said rock shaft, an arm fixedto the rock shaft and connected to the reversing arm, and a connection between the controlling lever and the throttle valve, whereby to operate the throttle valve by swinging said lever longitudinally of the shaft and to operate said reversing arm by swinging the lever at right angles to the 2. The combination with a throttle valve and a valve gear mechanism including a reversing arm, of a rock shaft, a yokefixed to one end of the rock shaft, a control lever disposed between and pivotally mount ed upon said arms of said yoke, an arm fixed to the rock shaft and connected with said reversing arm, and a connection between the lower end of said lever and thethrottle valve, whereby to operate said valve and reversing arm by movement of the lever in transverse planes: 1 3. The combination with a throttlevalve and a valve gear mechanism including a reversing arm, of a rock shaft, a yoke fixed to one end of the rock shaft and reaching at its outer end substantially beyond the adjacent end of the shaft, a control lever disposed between and pivotally mounted upon the extended ends of the yoke, a connection between the rock shaft and reversing arm, and a connection between the control lever and throttle whereby to operate the reversing arm and throttle by movement of said lever in transverse planes.

' HARRY C. CLAY.

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