US1168976A - Valve-gear. - Google Patents

Description

M. L. TALBERT.

VALVE GEAR.

APPLICATION FILED APR. 20, I915.

Patented Jan. 18, 1916.

2 SHEETSSHEET L. TALBERT.

VALVE GEAR..

tioned character, so constructed VALVE-GEAR.

Specification of Letters Patent.

Patented Jan. 18, was.

Application filed April 20, 1915. Serial No. 22,721.

To all who-m it may concern Be it known that L'MARK L. TALBERT, a citizen of the United States, residing at Macon, in the county of Bibb and State of Georgia, have invented certain new and useful Improvements in Valve-Gears, of which the following is a specification.

My invention relates to improvements in valve gears, adapted for use upon railway locomotives, while not necessarily restricted to such use. i

An important object of the invention is to provide a valve gear of the above menthat when the pitman and main crank are on dead center, thesteam chest valve cannot be shifted by swinging the reversing lever in either direction.

A further object of the invention is to provide a valve gear of the above mentioned character, which is simple in construction, inexpensive to manufacture, strong and durable.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same, Figure 1 is a side elevation of a valve gear embodying my invention, with the pitman and main crank on'dead center, Fig. 2 is a similar view with the pitman and main crank off of dead center, Fig. 3 is a perspective view of a rock-shaft and associated elements, Fig. 4 is a similar view of another rock-shaft and associated elements, and, Fig. 5 is an enlarged detail section taken on line 5-5 of Fig. l. I

In the drawings, wherein for the purpose of illustration is shown a preferred embodi ment of my invention, the numeral 5 designates a cylinder arranged upon each side of the locomotive (not shown) near its front end, as is customary. Disposed upon this cylinder is a steam chest 6, containing the usual slide valve (not shown) connected with and operated by a rod 7. Mounted to reciprocate within the cylinder 5 is a piston (not shown) connected with a piston rod 8, having connection with a cross head 9, operating between guides 10, as shown. Pivotally connected with the cross head 9 is a pitman 11 pivotally connected with the outer end of a main crank 12, rigidly secured to a.

18. Pivotally connected with the lower end of the support-arm 18, by a bolt 18 or the like, is the lower forked end 19 of a vertically swinging support link 19, shown more clearly in 5. This support link 19 has its upper portion slightly outwardly off-set and is provided therein with a recess 20, receiving the upper end of a suspension link 20, pivotally connected'with the support link 19 by a bolt 21. The lower end of the suspension link 20 is forked and pivotally connected with the pitman 16, at

a point near and spaced from its forward end, as shown at 21.

The bracket 17 s provided with a pair of rearwardly extending knuckles 22, be

tween which is pivoted a horizontal transverse rockshaft 23. An approxlmately horizontal rocker-arm 24: is rigidly secured to the rock-shaft 23 near its outer end, and I an approximately vertical rocker-arm 25 is rigidly secured to the rock-shaft 23 near its inner end, and depends therefrom, as shown. The rod 7 is pivotally connected with the lower end of the vertical rocker-arm 25. It is thus apparent that the rocker-arms 24 and 25 form in effect a bell-crank lever, for moving'the rod 7. Pivotally connected with the forward end ofthe pitman 16, as shown at 26, is an upwardly extending power transmitting link 27, the upper end of which is pivotally connected with the outer end of the rocker-arm 2 1, as shown.

Rigidly connected with the bracket 17 is a second bracket 26, carryingforwardly extending knuckles 27, through which is journaled a horizontal transverse rock-shaft 28, extending beneath the boiler of the locomotive for connection with the valve gears upon opposite sides thereof. vRigidly connected with this rock-shaft 28 are upstanding rocker- arms 29 and 29, as shown. Pivotally connected with the rocker-arm 29, as shown at 30, is a shifting link or pitman 31, the rear end of which is forked the link 2'7 to rise and"fall,which I ,and swinging the 1 mg rocker-arms 24 and 25 lIliLjClllGCtlOIl to and pivotally connected "wat ua ggep ea link 19, as shown at 32. Pivotallyconnected with the rocker-arm 29, as

V gagement with a toothed segment 37, as

shown. 'A valve gear is arranged upon each i side of the locomotive, and as they are'iden- 'tical, a description of one will suffice for both, it being sufficient to state that the rockshaft 28 which is turned bythe lever 34, is connected with elements of both valve gears, for, operating the same. I I

The operation of-the apparatus isasifollows: When the reversing 'lever'34' is in'the neutral or vertical position 'thesupport link 19 is also substantially vertical. Therota- I 'tion of the auxiliary crank'l5 efi'ects'are- ,ciprocatory movement of the auxiliary pitman 16, in turn swinging the suspension link 20. The forwardend of the auxiliary pitman 16, swinging upon the pivot 21', causes through the medium of the bell crank lever ing the rocker-arms 24 and 25 shiftsthe slide' valvein the steam'chesti'ti, but not sufficientlyfor introducing ste'am'into the opposite ends of the cylinder 5. When the forwardly with dead center the reversing lever 34: is swung support link 19 has'its forward endswung -forwardly,:whereby'the suspension link 20 elevates the forward end of the auxiliary lpitman- 16 moving the link 27'upwardly, bell crank lever embody- 'move'slide valve rod 7 rearwardly; When 7 the reversin lever 3-1 is moved 'rearwardly from the neutral-position justthe reverse of this operation takes'place and the slide'valve rod 7 is shifted forwardly.

c When the'main crank 12 and jpitman 11 fare on dead center the auxiliary pitfnan 16 moves the suspension link 20 so thatQits lower 18? .ofthe support link 19, the suspension link and support "link thus coinciding throughout the entire, length.

r 1,168,976 f I shown-at 30, is; a reach rod 33, the rear end of, whichlis".

reversingdever' the. cab," as

embodypivot coincides'with the lower pivot It will now mpossible tbfmov the slide valve rod 7 by swinging thereyersing lever 34: in either 7 direction: This isan important feature of .the'invention as it, provides means whereby fluid pressure cannot be introduced into either end of the cylinder, by operating the reversing level. when the main crank and ipfitman are ,ioniidead center.

It is to be understood that the form of my invention herewith shown and described 3 isftobe taken as a preferred example of the san1e,'andfthat varlouschanges in the shape,

size; and arrangement ofparts may be re- 7 sortedgto without departing from the spirit of the invention or vthe'scope of the sub I joined claim; e e 7 avingitthus described the invention, I

In a valvegearof the character described, a bracket'to be secured to a locomotive and having t spaced Y ears, a' rockshaft arranged "between the ears and" pivotally connected therewith and carrying 7 approximately hori- -zontal and vvertical arms, a supportarm secured to the bracket between itsuspaced ears and arranged between'said arms and extending downwardly therebelow, aasupport link pivotally connectedwithz-the lower end of the support-arm, a suspension link of; the support link, a pitmanpivo'tally connected with the lower end of the suspension pivotally connected" with the upperv portion 7 -link an'd extending ,forwardly'therebeyond for a substantial" distance, a connecting link between the forward-end of the-puma and the approximately horizontal or ;arm *of the rockesha'ft, a valve. rod ,jconneeted withthe approximately :vertical arm of the rock- .shaft, a vertically swinging operating meniber having connection 'with thenpper {end 7 of the support link to swing it in opposite directions, manually. operated me'ans to shift .thexopefrating, member, and means :to i drivei'thepitmanp Initestimon'y whereof Iaflix my signature -inpresenceV of two witnesses;

' MARKL. TALBEBT. Witnesses: -G. RANDALL, V

' A.-R,Jon1vsoN.

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