US598153A - Twentieths to george dexter rand - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1. J. A. KOLLMYER.

ROTARY CUT OPF VALVE.y

No. 598,153. Patented Feb. l, 1898.

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Patented Peb.V 1, 1898.

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Patented Feb. l, 1898.

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UNITED STATES PATENT @Erica JOllb.T ANDREW KOLLMYER, OF KEOKUK, IOWA, ASSIGNOR OE NINE- TVENTIETHS TO GEORGE DEXTER RAND, OF SAME PLACE.

ROTARY CUT-OFF VALVE.

SPECIFICATION forming part of Letters Patent o. 598,153, dated February l, 1898.

Application led May 6,1897. Serial No. 635,354. (No model.)

To all whom it mag/concern.-

Be it kn own that I, JOHN ANDREW Komfy -MYER7 residing at Keokuk, in the county of 'upon the working of the engine or governor and by a continuous forward movement; and the further object of the invention is to improve the construction and combination of parts of a cutoff valve.

Figure lis a broken side elevation of s much of an engine as is needful to 4show the general relation of parts in my invention. Fig. 2 is a partialelevation and partial section of the crank-shaft and gearing. Fig. 3 is a sectional plan of engine and gear. Figs. 4 and a are elevations of a gear and connections preferred for rotating the valve, showing dierent positions. Fig. Ll1 is abroken detail, a reverse view from Fig. 4. Fig. 5 is a central longitudinal section or diagram of a steam-cylinder and valve-seats according to my invention. Fig. 6 is a side elevation Fig. 7 isha broken elevation and section of the valve-plugs in their seats. Figs. S and 9 are cross-sections of valve seat and plug in diiferent positions.

In many respects these illustrations are merely diagrammatic, as a great number of changes in construction may be made without departing from the spirit of the invention. No cylindenheads are shown in Fig. 5.

The cylinder 1 is of usual construction for steam-oylinders. A supplyof live steam at 2 has access to the valve-seats 3 3X by passing through the valve-plugs 4 4X, said plugs being hollow, having side or annular openings, and the outer ends of said plugs being closed, as indicated in dotted lines. The two plugs are connected by a spindle 6, so that both plugs may move together, and exhaust is effected through ports or passages 7 7 X.

The valve-seats 3 3X are hollow cylinders with radial slots or passages therein. Preferably these slots are wider at the outer end, so as to give a quick and free exhaust. The slots a ax are the same length ascorresponding slots b bx in the hollow cylindrical valveplugs. The slots a in valve-seat 3 are not in line longitudinally with the slots ax in seat 3X, but the slots in one valve-seat are in line with the closed ports of the other and the valve-plugs are of corresponding construction. Thevalve plugs are closed hollow cylinders at the outer ends, and these closed rings serve to close the ports ci or dx when the plug is in proper position. The ports 0J or ax are alternately opened and closed lby the longitudinal movement of the valve-plugs through stem 8, as usual in slide-valves. The longitudinal move ment of the plugs is effected by the cam or eccentric or in other usual manner. The longitudinal movement of the two plugs from the position of Fig. l toward the left opens all the passages ax by reason of all the passages hX being in line therewith. At the same time the exhaust is opened by the movement of the ring or cup part of plug 4 away from the openings c. ln this described position of the valve the steam from chamber 2 passes through openings hX a* to the cylinder. Then the cut-od comes into operation, as will be described.

The cutting od of the steam is effected by the rotation of the valve-plug in its seat and is quick or slow, according to predetermined conditions or factors. As there are a large number of passages through the valve-plug, the steam or gas hnds ready access to the cylinder. In the device illustrated, with eight passages in the valveseat and a similar number in the plug, a turn of the plug of about twenty-two and one-half degrees will close the'valve from open position, or vice versa. As a small overlap is allowed, this movement may be a little more than twenty-two and one-h alf degrees; but it will be readily understood that the movement is slight. The same rotary movement which closes the ports ax by movement of plug fix brings the opening b in plug 4 .in line with the `passages u, in seat 3, so that the next reverse longitudinal movement of the plugs will open all the passages in 4, leaving them to be closed as a cut-olf by a further rotation of the plugs in the same direction. A mechanism by which this intermittin g rotation of the valve-plugs, always in` one direction, may be effected will now be described. p

In Fig. 3 the general relation of the parts is shown, the cylinder being designated by numeral 1, as in other figures. The piston, piston-rod, and pitman bear the usual relation to the crank-shaft 10, which is supported on frame A. The longitudinal movement of thevalve is effected by the usual eccentric 100 and reciprocating rod 99, to which shaft 8 is connected so as to reciprocate, being left freey to rotate.

'Ihe valve-rod 8, which reci procates in bearings in the frame, may be either splined or polygonal and' passed through a short shaft i0, which shaft is supported in bearings B on the frame. rPhe rotation of gear 11, fixed to shaft 40, causes the rod S and its plugs to rotate. As a means of causing this'gear 11 and rod or shaft 8 to rotate intermittingly always inone direction and under control of the governor I have illustrated a mechanism con-` nected to the crank-shaft; but it must beunderstood that it may be connected to some other rotating shaft.

The fly-wheel 12 carries a Weight 13 on arm 14, yieldingly connected to sleeve 18 on the shaftnear the hub of the fly-Wheel. A spring 15, connected by link 16fto the arm or weight, tends to retire the weight toward the center of the ily-Wheel, while centrifugal force tends to throw this weight outward. This connection of the weight or governor to the sleeve 18 causes the sleeve, while generally partaking of the rotary motion of the shaft, to be turned at times either a little in advance of its median position on the shaft when the governing-weight is thrown outward by a rapid rotation of the ily-wheel or a little behind this position when the rotation of the shaft permits the spring to draw the weight inward. Sleeve 18 carries a bevel-gear 19, which meshes with gear 20, and thus rotates shaft 2]., supported in suitable bearings. This shaft 2l should make on the average a determined number of revolutionsin the present instance, two rotations-for each rotation of the main shaft; but as the sleeve 18 and its gear may be either advanced or retarded by the governor the relative initial point of rotation of the shaft 21 may not agree With that of the driving-shaft. Shaft 21 carries a one-tooth disk 30 and a mutilated disk 22, a concave portion being cut from said disk 22. In line with this concave portion at the side of the disk 30 there is a tooth 23. This tooth 23 engages gear-Wheel 11,l through which the shaft 8 passes, so that each revolution of the shaft 2l gives one impulse t0 wheel 1l and turns lshaft 8 a distance great enough to -cut off the steam by the rotation of the valve-plugs, and as the initial position of shaft 21 is controlled by the governor this cutting olf of the steam will be effected more or less quickly after the reciprocation of the valve, according to the position of the governor. When the tooth 28` has passed out of engagement with one of the teeth of gear wheel or pinion `l1, the convex side of the mutilated-disk@ comes into one of the concave spaces 24 of a disk 25, which disk 25 is rigidly connected to pinion 11. The engagement of these disks prevents the rotation of the gear 1l, and thus of the valve, until the linger or tooth 23 again comes around. By this means a second rotary impulse is given to the valve, and as these impulses occur about twice for each revolution of the main shaft the cut-off of steam will take place at corresponding intervals. Of course the number of teeth in the driving-gear 11 will bear definite relation to the ports in the valve and valve-seat.

From the foregoing it may be understood that a valve constructed to operate on the general principles 'set forth may be moved with extreme rapidity. As the ports are vthrown quickly open by longitudinal movei ment ofthe valve and closed by rotation proportioned to the speed of the engine or to the adjustment of the governor, there is little tendency to wiredraw steam through narrow passages kept open for a relativelylongtime.

Prior to my invention I believe cylindrical valve-seats for somewhat similar purposes IOO have been known, and a cylindrical valve has been caused to oscillate or rock therein to act as a'cut-o. This causes the wear on the valve and seat to come on the same points all the time, and such a valve is soon worn or disabled, whereas the' valve of the present invention, constantly rotating in one direction, may be maintained in good condition for a very long time.

In valves of the general character to which I have referred the cut-off has generally been effected by an eccentric mechanism, which operates with something like a uniform rate of speed, and thevalve slowly closes by its oscillation. In the present invention the rotation of the valve is eected by a very quick movement, the valve starting its rotation at full speed and continuing its movement until closure is completed at this high speed, then remaining at rest until the next rotary movement. The initial point of position or instant of time at Which this rotary or cut-off movement shall begin and end are determined by the governor. it", It must be understood that the governor need not be of thel particular form shown and described herein. Having set forth the general principles and illustrated one mode of carrying the same into operation, skilled mechanics will be able to apply the same to equivalent constructions.`

1. In a valve-gear as described, the intermittingly-rotating valve, the driving-pinion thereof having a notched holding-disk attached, and the driving-shaft having a'tooth lfor engagement at each rotation with a tooth of said pinion, and having a notched disk engaging the notches of the holding-disk on the valve-plug to prevent rotation, all combined substantially as described.

2. The connected cylindrical valve-plugs closed at their outer ends and having radial slots in their sides, the hollow cylindrical valve-seats having slots corresponding in number with the slots in the plugs, but enlarged at the ends through which the steam exhausts, means for moving the valve-plugs longitudinally, means for rotating the valveplugs intermittingly in one direction, and a connection from the governor controlling the initial rotary movement, all combined substantially as described.

3. The reciprocating valve-rod and its valveplugs and the valve-seats, the rotating sleeve through which said valve-rod moves, said sleeve and rod being connected for synchronous rotation, the gears fixed to said rotating sleeve, a single-tooth gear propelled bya shaft under control of the governor and engaging one of the gears on the said rotating sleeve, and a mutilated disk propelled by the same governor-controlled shaft acting on the second gear of the sleeve to prevent undue rotation, all combined snbstantiallyas described.

4. A reciprocating and intermittingly-rotating val Ve-plug, the valve-seat therefor, the reciprocating valve-rod and a single continuons rotating valve-operating shaft parallel therewith, and having an ntermitting gear engaging the valve-rod to rotate the same at intervals in one direction, and the governor controlling the initial position of the rotatin g shaft', all combined substantially as described.

In testimony whereof I afx my signature in presence of two witnesses.

JOHN ANDREV KOLLMYER. Witnesses:

WM. A. LOEFFLER, W. A. LOGAN.

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