US715755A

US715755A - Valve-motion.

Info

Publication number: US715755A
Application number: US7125201A
Authority: US
Inventors: Ray C Carroll; George S Roberts
Original assignee: CARL J LARSON; LE ROY A CARROLL; MANLEY R WORDEN; N L NAWTON; PERCY P WORDEN
Current assignee: CARL J LARSON; H E BAKER; MANLEY R WORDEN; N L NAWTON; LE ROY A CARROLL; PERCY P WORDEN
Priority date: 1901-08-07
Filing date: 1901-08-07
Publication date: 1902-12-16
Anticipated expiration: 1919-12-16

Description

no.- 7|5,75'5. l. Fammil um la, |902.

n. c. cmznuLL a. s. s. ROBERTS.

VALVE MDTIUN. (pplimion und Aug. 7, 1901.

-I (No Nadal.)

l' n c TH: Noam: Pinzas co. mas-umu. wnngnavou vNo,.v7|'5,755. Patented Dep. I6, |902;

R. C. CARROLL G. S. ROBERTS.

' vALvE Marlon. applic-anim riled'Aug. 7. 1901.

4 Sheets-Sheet 2.

(Nvo Mbdala Patented Dec. I6, |902. 'R. C. CARROLL 8 G. S. RUBERTS;

VALVE MOTION.-

(Application 1ed`Aug. 7, 901.)

No Rodel.)

' fno. 7|5,755.` Patented nec. I6, |902.

R. c. cAnnoLL a G..s. noznrs.

VALVE-MOTION.

(Application ild Aug. 7, 1901.) (No Model.) 4 Sheeis-Sheet 4.

UNITED STATES# PATENT OFFICE.

RAY C. CARROLL AND GEORGE S. ROBERTS, OF GALESBURG, ILLINOIS,

ASSIGNORS OF PART TO H. E. BAKER AND N. L. NAWTON, OF OTTUM- WA, IOWA, PERCY P. WORDEN, CARL J. LARSON, AND MANLEY R. VORDEN, OF GALESBURG, ILLINOIS, AND LE ROY A. CARROLL, OF

SIIEEFIELD, ILLINOIS.

VALVE-MOTION.

SPECIFICATION furlnng part 0f Letters Patent NO. 715,755, Vdated December 16, 1902.

Application filed August 7, 1901. Serial No. 71,252. (No model.)

To all whom, it may concern.-

Be it known that we, RAY C. CARROLL and GEORGE S. ROBERTS, citizens of the United States, residing at Galesburg, in the county of Knox and State of Illinois, have invented certain new, and useful Improvements in Valve-Gears, of which thefollowing is a speciflcation.

The principal object of the present invention is to provide a valve-gear of such construction that the efficiency of the engine will be increased by reason of the fact that the valve will be given a quick movement and may -be made to positively cut olf at vabout half-stroke. In accomplishing this object we dispense with the use of eccentrics and links, such as are customarily used on locomotives, and in lieu thereof we use a system of parts which derive their movement from some moving part of the engine, preferably the main pitman. We have aimed to so arrange these parts that they will produce a quick opening and closing movement of the valve, which movement is begun at about the commencement of each stroke and completed considerably within a quarter-revolution. By reason of'this quick opening-and-closing movement of the valve we effect a saving in steam, and consequently a saving in fuel, and in addition to this we are enabled to increase the speed of the engine.

The invention also contemplates improved means whereby the valve-gear may be set for either a'forward or a backward movement of the engine, and for this purpose we make use ofa controlling-lever which is adapted to shift certain parts to one or the other side of the centerotl motion of certain other parts, the arrangement being such that when the controlling-lever is in central position the valve will remain in central position and at rest, notwithstanding themovement of some of the parts, and the engine may drift.

A Valvegearconstructed in accordance with ourinvention is made npof sim ple parts, is inexpensive inl construction, is not liable to get out of order, and is'easily adapted to any engine.

The invention consists in the features of novelty that are hereinafter described with reference to the accompanying drawings, which are made a part hereof, and in which- Figure lis an elevation of a Valve-gear embodying the invention, al1 of the parts being shownon centers with the valve closed and the engine on the forward center. Fig. 2 is a side elevation thereof with the controllinglever in the position which it occupies when the valve-gear is set foraforward movement of the engine, the Valve being shown closed and the engine on the forward center. In this figure the positions'which'the parts occupy when the engine has reached the first quarter are indicated by dotted lines. Fig. 3 is a similar View showing the parts in the positions which they occupy when the engine is at the back center, the positions which the parts occupy when the engine is at the third quarter being indicated by dotted lines. Fig. 4 is an elevation of the valve-gear, showing the controlling-lever in the position which it occupies when the valve-gear is set for abackward movement ofthe engine, the parts being shown in the positions which they occupy when the engine is at the first quarter,running backward. Figs. 5, 6, and 7 are sections on the

lines

5, 6, and 7, respectively, Fig. l, showing details; and Fig. 8 shows a modification of the controlling-lever and a portion of the link by which it is connected with the valve-gear.

A represents the cylinder, B the pitman, C the guide, D the Wrist-pin, and E the driving-wheel of an engine, all of which may be of any desired construction.

F is a guide, having an undercut groove, in which tits so as to be capable of sliding endwise the lower end of a rod G, hereinafter called the motion-rod. This rod is bifurcated at its lower end, so as to straddle Athe pitman, and preferably antifriction-rollers g are secured to it in positions to engage the top and bottom sides of the pitman, so that asthe pitman moves up and down it will produce a corresponding np-and-down movement of the motion-rod. The upper end of the motion-rod is jointed to one arm of a bell-crank lever H, the other arm of which is jointed to a link I. One end of this link is jointed to a rocker J, which is pivotally supported, so as to be capable of oscillating back and forth. The rocker J has an undercut groove j, which forms a guideway for a slide L, to which is jointed one end of a link M, the other end of which latter is jointed to a hanger N, and to this hanger is jointed one end of the stem O of the valve P.

In Fig. G the beveled edges of the motionrod, which occupy the undercut grooves of the guide F, are shown, but the undercut groove itself is not shown. It is made precisely in the same manner as is the undercut groove j of the rocker J, and Fig. 5 of the drawings as correctly represents a cross-section of the guide F as it does a cross-section of the rocker J.

WVith the parts thus far described it is manifest that the movement of the pitman will cause an up-and-down movement of the motion-rod. This in turn will cause an oscillating movement of t-he bell-crank lever, this in turn will cause an endwise reciprocating movement of the link I, and this in turn will cause an oscillating movement of the rocker J upon both sides of its central position-z'. e., the position in which it is shown in Fig. l. It is also manifest that with the slide L in the central position shown the movement of the rocker will not produce any movement of the link M, and consequently the valve P will remain at rest. It is also manifest that if the slide L be placed at one side of the center of oscillation of the rocker an endwise movement will be imparted to the link M and the valve will be moved back and forth, the direction of movement depending upon the position of the slide L with respect to the center of oscillation of the rocker-i. e., above it or below it.

The objects of the mechanism hereinafter described are, first, to enable the slide L to be moved away from the center of oscillation of the rocker J in order that movement may be imparted to the valve; second, to enable said slide to be placed either above or below the center of oscillation of the rocker in order to determine the direction of motion, and, third, to quickly return the slide to its central position, and thereby cut off the steam after the valve has been open for a sufticient length of time.

The link I is connected by a link I' with a second rocker J', which is similar in construction to the rocker J. It has an undercut groovej', in which is mounted a slide L', and this slide is connected by a link M' with a hanger N', the latter being connected by a link Q with one end of a link R, the other end of which latter is jointed to the link M. At the junction of the links Q and R is a runner s, preferably in the form of an antifrictionroller which runs in a cam-slot of substantially S shape formed in a plate S.

T is the controlling-lever, which is connected by a link U with one arm of a bellcrank lever V, the other arm of which latter is connected by a link W with the slide L'. While the controlling-lever is in central position, as shown in Fig. 1, and the engine is on either center, the slides L L' will be in central positions, and the runner 8 will be in the center of the cam-slot, and, as before stated, the valve will remain at rest. When the controlling-lever is thrown from the position shown in Fig. 1 to the position shown in Figs. 2 and 3, the slide L' will be moved to a position below the center of oscillation of the rocker J', and through the medium of the link M', hanger N', and link Q the runner s will be moved to the left of the center of the cam-slot, and if the engine is on either center the runner will go to the bottom of the V- shaped portion of said slot. This is due to the fact that the groove of the rocker J confines the slide L' and the adjacent end of the link M' to a rectilinear movement, thereby causing a movement of the other end of said link, which moves the hanger N and link from the positions shown by full lines in Figs. 2 and 3. This movement of the runner s (to the bottom of the V-shaped portion of the slot) will in turn move the link R downward and move the slide L to a position below the center of oscillation of the rocker J. All of these changes in the positions of the parts, due to the movement of the controlling-lever from the position shown in Fig. 1 to the position shown in Figs. 2 and 3, are shown by the full lines in the latter figures. The parts are then in position to cause the engine to move forward. With the parts in the position shown by full lines in Fig. 2 the valve is just about to move and uncover the port As the pitman moves through its rst quarter-vl. e., from the position shown by full lines to the position indicated by dotted lines in Fig. 2 it will draw the motion-rod downward and move all the parts from the positions shown by full lines to the positions indicated by dotted lines in said figure, the directions in which the several parts move being indicated by arrows. While the runner s stands in or is moving toward the position shown by full lines the slide L is below the center of oscillation of the rocker J, so that as the rocker moves from the position shown by full lines to that indicated by dotted lines it will draw the valve P to the left and uncover the port During this quarter movement of the pitman the rocker J' will move from the position shown by full lines to the position indicated by dotted lines, the runners will move from the position indicated by dotted lines in Fig. 2 to the position indicated by dotted lines in Fig. 3, and thereby move the slide L first away from and then back to its central position, thus both opening and closing the valve within a quarter-stroke. The opening takes place during the first half and the closing takes place during the last half of this quarter- IOO IIO

stroke. The valve then remains closed'during the second quarter-stroke or until the pitm an reaches the position shown by fulllines in Fig. 3. In like manner withl the parts in the positions shown by full lines in Fig. 3 the valve is about to open for the return stroke and will be moved and uncover the port y and again close it as the pitman moves through its third quarter or from the position shown by full lines to the position indicated by dotted lines in said figure. During this third quarter-stroke all the parts will operate substantially as above described, excepting that they will move in directions the reverse of the directions in which they moved during the first quarter, excepting that the slide L will as before move first downward from the center of oscillation of the rocker J and then back to said center. When the controlling-lever is thrown to the position shown by full lines in Fig. Lt, the slide L will be moved to a position above the center of oscillation of the rocker J. Thisin turn will cause the runner s to travel in th'e lap than the rear port.

For a stationary engine the controlling-level-.T may be connected with the link M directly instead of through the medium of the parts described.v For this purpose the controlling-lever may have an arm T', as shown in Fig. S, and this arm may be connected with the link M by means of a link X. iVith this direct connection the slide L may be placed incentral position, or it may be placed either above or below the center of oscillation of the rockerJ. When in either of these off-center positions, it will cause an even reciprocation of the valve forward and backward, correspending with the movements of the piston. When the slide is upon one side of the center of oscillation, the engine will run in one direction, and when upon the opposite side it will run in the opposite direction. VAs before stated, during the last half or, thereabout, of each stroke, or, in other words, while the pitman is moving from the position indicated by dotted lines in Fig. 2 to the position shown` by full lines in Fig. 3 and from the position indicated by dotted lines in Fig. 3 to the position shown by full lines in Fig. 2 the valve remains closed and at rest, notwithstanding the fact the rockers J and J are constantly oscillating and the slide L is constantly moving to and from the center of oscillation of the rocker J. This is due to the fact that during these periods the movement of the slide L away from the center of oscillation of the rocker J neutralizes the effect of the movement of said rocker to its central position, or, conversely, the movement of said rocker to its central position neutralizes the effect of the movement of the slide from its center of oscillation. It has already been statedthat if the slide remained constantly off center the oscillations of the rocker would constantly move the valve back and forth. It is also true that if the rocker remained constantly at rest and in inclined position the toand-fro movement of the slide would constantly move the valve back and forth. In this lattter case the rocker would act as a cam for guiding the slide in a direction oblique to the link M, and thus move said link back and forth endwise. Referring to Fig. 2, if the Vslide were to remain at rest and off center as there shown the movement of the rocker from the dotted position to central position (shown by full lines) would move the valve and uncover the port y, and this would 'take place during the last half of the backward stroke, thus admitting steam behind the piston and reversing its movement before its stroke is completed. On the other hand, if the rocker were to remain at rest in the position indicated by dotted lines the movement of the slide from central position during the last half of the backward stroke would again uncover the port a; andadmit more steam in front of the piston, and thus the eect of cutting off at half-stroke would be lost, and the action would be practically the same as if the slide remained constantlyoff center. In other words, the port would be uncovered. and covered twice during each stroke of the piston; but the described movements of the rocker J and slide L during the last half of each stroke being in effect opposite and equal the one nentralizes the other and the valve remains at rest.

It will be observed that the slot in the camplate is made up of three branches l, 2, and 3. The branches l and 2 combined form a slot. of V shape, (substantially,) and the branches 2 and 3 combined form a slot of inverted-V shape, (substantially.) These branches are so arranged that the runner s always travels in that branch of the slot which is inclined in the same direction as is the rockerforthetimebeing. Forinstance,start ing with the parts in the positions shown in Fig. 2, during the first quarter the runner will travel in the branch 2 from the position shown by full lines to the position indicated by dotted lines, and the rocker J will meanwhile be moving tothe position indicated by dotted lines, in which position it inclines in the same direction as does the branch 2; During the second quarter the runner will travel in the branch 2 from the position indicated by dotted lines back to the position shown by full lines, during which period the rocker J is still inclined in the same direction, although constantly moving toward the position shown by full lines. During the third IIO quarter the runner will travel in the branch 1 from the position shown by full lines in Fig. 3 to the position indicated by dotted lines in said figure, and the rocker will meanwhile be4 moving to the position indicated by dotted lines, in which position it inclines in the same direction as does the branch l, and so on through the fourth quarter. In these operations it may be said that dn ring the first and third quarters the rocker acts as a lever and moves the valve to uncover a port, while the groove of the rocker acts as a cam for returning the valve to cover said port. During the second and fourth quarters this lever action and cam action neutralize each other.

It will be understood that to adjust the lap of the valve it is simply necessary to adjust it forward or backward upon its stem or adjust the connection between it and the slide. This is the work of the engineer. It will be understood also that the throw of the valve will depend upon the distance the controllinglever is moved from central position.

The removability of the block g' enables the motion-rod to be taken down.

Having thus described our invention, what we claim as new therein, and desire to secure by Letters Patent, is-

1. In a valve-gear, the combination with the pitman and valve, of a motion-rod engaged by the pitman, a rocker connected with the motion-rod, a slide carried by the rocker, means connecting the slide and valve, and means connecting the motion-rod and slide, substantially as described.

2. In avalve-gear, the combination with the pitman and valve, of a motion-rod engaged by the pitman and moved thereby, and means connected with and deriving its movement from the motion-rod for automatically converting the constant movement of the motionrod into an intermittent movement of the valve with intervals of rest, substantially as described.

3. In avalve-gear, the combination with the pitman and valve, of a motion-rod engaged by the pitman, means for confining the motion-rod to an endwise-reciprocating movement, means connecting the motion-rod and Valve and means for permitting lost motion between the motion-rod and the valve during the latter part of each stroke, substantially as described.

4. In a valve-gear, the 'combination with the pitman and valve, of a motion-rod engaging the pitman and moved thereby, means connecting the motion-rod and Valve for moving the latter to and fro and thereby opening and closing the valve during the first part of each stroke, and means connected with the motionrod for preventing movement of the valve during the latter part of each stroke, substantially as described.

5. In a valve-gear, the combination with the pitman and valve, of a rocker, means for 0scillating it, a slide carried by the rocker and movable to and from its center of oscillation,

means connecting the slide and valve, and means deriving its movement from the pitman for moving the slide to and from the center of oscillation of the rocker, substantially as described.

G. In a valve-gear, the combination with the pitman and valve, of a motion-rod, a rocker, means connecting it with the motion-rod, a slide carried by the rocker and movable to and from its center of oscillation, means connecting the slide and valve, and means connecting the motion-rod and slide for moving the slide to and from said center of oscillation, substantially as described.

7. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, means connecting the slide and valve, and means for automatically moving the slide to said center of oscillation during the movement of said rocker in one direction from its central position and from said center of oscillation during the movement of said rocker in the opposite direction to its central position, substatitially as described.

8. In a valve-gear, the combination with the pitman and the valve, of a rocker, means for oscillating said rocker, a slide carried by the rocker and movable to and from its centerof oscillation, means connecting the slide and the valve, and means deriving its movement from the pitman for automatically moving said slide iirst away from and then back to said center of oscillation during each movement of the rocker away from and back toits central position, substantially as described.

9. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, means connecting the slide and valve, means for automatically moving the slide to said center of oscillation during the first part of each stroke of the piston, and means for automatically moving said rocker away from said center of oscillation during the latter part of each stroke of the piston, substantially as described.

10. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, on either side thereof, means connecting the slide and valve, controlling mechanism adapted to move the slide to either side of said center of oscillation, and means for automatically moving the slide to and from said center of oscillation as the rocker oscillates, substantially as described.

1l. In a valve-gear, the combination with the valve, of a motion-rod, a rocker, means connecting the motion-rod and rocker, a slide carried by the rocker and movable to and from its center ofoscillation, on either side thereof, means connecting the slide and valve, a controlling-lever, means connecting the con- IOO IIO

trolling-lever and slide for moving it to either side of said center of oscillation, and means connecting the motion-rod and slide, substantially as described.

12. In a'valve-gear, the combination With the pitman and valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center, means connecting the slide and valve, and means for moving the slide to and from said center of oscillation during the movement ofthe rocker, the means last aforesaid having movable parts connected with the pitman and a cam coperating With said movable parts, substantially as described.

13. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, means connecting the slide and valve, a cam, a runner engaging said cam, means for moving said runner back and forth, and means connecting said runner with the slide, substantially as described.

14. In a Valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, means connecting the slide and valve, a cam of substantially V shape, a runner engaging said cam, means for moving said runner to and fro, and means connecting said runner and slide, substantiallyas described.

15. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, means connecting the slide and valve, a second rocker, means for oscillating it, and means connecting the second rocker with the slide aforesaid for moving it to and from the center of oscillation of the rocker carrying it,`

substantially as described.

16. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and .from the center of oscillation, means connecting the slide and valve, a cam, a runner engaging the cam, means connecting said runner with the slide, a second rocker, means for oscillating it, and means connecting the second rocker With the runner aforesaid, substantially as described.

17. In avalve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, means connecting the slide and valve, a cam of substantially V shape, a runner engaging said cam, and means for moving said runner over said cam as the rocker is oscillated, whereby the slide is moved to and from the center of oscillation of the rocker, substantially as described.

18. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, on either side thereof, means connecting the slide and valve, means for placing the slide upon either side of the center of oscillation of the rocker, a cam having reverse features, a runner engaging said cam, means for moving said runner, and means connecting said runner and slide, substantially as described.

19. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, on either side thereof, means connecting thev slide and valve, means for moving the slide to either side of the center of oscillation of the rocker, a cam of substantially S shape, a runner engaging said cam, means for moving said runner, and means for connecting said runner with the slide, substantially as described.

20. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation, on either side thereof, means connecting the slide and valve, means for moving the slide to either side of the center of oscillation of the rocker, a cam of substantially S shape, a runner engaging said cam, means for connecting said runner with the slide, a second rocker, means connecting the said rocker With the runner aforesaid, means for oscillating said second rocker, and means for moving the runner aforesaid to either side of the center of the cam, substantially as described.

21. In a valve-gear, the combination with the valve, of a rocker, means for oscillating it, a slide carried by the rocker and movable to and from its center of oscillation on either side thereof, means connecting the slide and valve, a second rocker, means for oscillating it, a slide carried by the second rocker and movable to and from its center of oscillation, on either side thereof, means for moving said slide to either side of the center of oscillation of the second rocker and there holding it, and means for connecting the two slides, whereby the position of one determines the position of the other with respect to the centers of oscillation of the rockers, substantially as/described.

22. In a valve-gear, the combination with the valve, of a pair of rockers, means connecting said rockers upon opposite sides of their centers of oscillation, whereby they are compelled to move in opposite directions, means for imparting movement to said connect-ing means, a slide carried by one of said rockers and movable to and from its center of oscilf king them upon opposite sides of their centers of oscillation, means for imparting movement IOO IIO

IZO

to said connecting means, a slide carried by one of the rockers and movable to and from its center of oscillation, means connecting said slide with the valve, a cam, a runner engaging said cam, means connecting said runner with the slide aforesaid, a link connected at one end to said runner, a hanger to which the other end of said link is connected, and a second link connected to said hanger and to the other of the two rockers, substantially as described.

24. In a valve-gear, the combination with the valve, of a pair of rockers, means connecting them upon opposite sides of their centers of oscillation, meansfor imparting movement to said connecting means, a slide carried by one of the rockers and movable to and from its center of oscillation, upon either side thereof, meansconnectingsaid slide with the valve, a slide carried by the other of said rockers and movable to and from its center of oscillation, upon either side thereof, means for moving the slide last aforesaid to either side of said center of oscillation and there holding it, an S-shaped cam, a runner engaging said cam, means connecting said runner with the slide first aforesaid, and means connecting said runner with the slide second aforesaid, substantially as described.

25. In a valve-gear, the combination with the valve and pitman, of a pair of rockers, a motion-rod engaging the pitman, a bell-crank lever, lneansconnecling said bell-crank leverl with both of the rockers, a slide carried by one of the rockers and movable to and from its center of oscillation, means connecting said slide with the Valve, and means deriving its motion from the second rocker for moving the slide aforesaid to and from the center of oscillation of the first rocker, substantially as described.

26. In a valve-gear, the combination of a valve and its stem, of a hanger to which the stem is jointed, a link jointed at one end to the hanger, a slide to which the other end of said link is jointed, a rocker carrying the slide, and means for oscillating the rocker, substantially as described.

27. In a valve-gear, the combination with the valve and pitman, of the motion-rod G, the bell-crank lever H, the rockers .I and J', the links I and I connecting the bell-crank lever with the rockers .I and J respectively, slides L and L carried by the rockers and movable to and from their centers of oscillation upon either side thereof, means connecting the slide L with the valve, means for moving the slide L' to either side of the center of oscillation of the rocker J and there holding it, an S-shaped cam, a runner engaging said cam, means connecting said runner with the slide L, and means connecting said runner With the slide L', substantially as described.

RAY C. CARROLL. GEORGE S. ROBERTS. Witnesses:

L. M. RICHARDS. C. M. S. RICHARDS.