US868280A - Valve-gear. - Google Patents

Description

No. 868,280. PATENTED OCT. 15, 1907.

S.-W. LONG.

VALVE GEAR. APPLIOATIONIILIED FEB. 19. 1907.

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s. W. LONG. VALVE GEAR. APPLIUATION FILED IBB.1 9. 1B07.

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SAMUEL W. LONG, OF CLARENCE, MISSOURI.

VALVE-GEAR.

Specification of Letters Patent.

Patented Oct. 15, 1907.

Application filed February 19, 1907. Serial No. 358,264.

To all whom it may concern:

Be it known that I, SAMUEL W. LONG, a citizen of the United States, residing at Clarence, in the county of Shelby and State of Missouri, have invented certain new and useful Improvements in Valve-Gears, of which the following is a specification.

This invention contemplates certain new and useful improvements in valve gear for engines using either slide or oscillating valves and the invention has for its object a simple, durable and efficient construction of valve gear embodying few parts that may be readily assembled and operated by a single lever to vary the expansion and to reverse the movements of the valve.

With this and other objects in view, as will more fully appear as the description proceeds, the invention consists in certain constructions, arrangements and combinations of parts hereinafter described and particularly pointed out in the appended claims.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction and the means for effecting the result, ref

erence is to be had to the following description and accompanying drawings, in which:

Figure 1 is a side elevation of one embodiment of my improved valve gear, a slide valve being shownin section for the purpose of illustration only; Fig. 2 is a sim ilar view, except that the slide valve is omitted. The parts of the gear are shown in a different position from that in which they appear in Fig. 1, and a different or modified arrangement of actuating parts is illustrated; Fig. 3 is an end view of the gear; Fig. 4 is a horizontal sectional view, the section being taken through the yoke and oscillating block hereinafter described; and Fig. 5 is an edge view of the parts arranged as illustrated in Fig. 2.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Referring to the drawings, the numeral 1 designates the eccentric of an engine, and 2 the strap therefor.

. Secured to the strap 2, by threaded or other engage- 4 of an oscillating block 5.

- The pin 9 extends through a stirrup 10, which latter embodies two spaced bars that are connected together at their upper ends by a cross bar 11. The lower ends of the arms of the stirrup 10 have an antifriction block 12, mounted between them and the coupling pin 9 extends through said arms and through saids antifriction block. The lower ends of the stirrup l0 embrace a yoke 13, the slot 13 of which extends perpendicularly to the line of movement of said yoke, and the block 12 is mounted to move in and is guided by the said slot. The yoke 13 is provided with oppositely extending arms 14 that are preferably square or non-circular in cross section, as shown, and these arms slide through the brackets 15. To one of the arms 14, the valve rod 16 is secured, either permanently as by welding, or temporarily, as by screw threaded connection; and 17 designates the valve to which the rod 16 is operatively connected. This valve may be either a slide valve or an oscillating valve, the former type being shown in the present instance.

In that embodiment of the invention illustrated in Fig. 2, the stirrup 10 is pivotally connected at its upper end to one arm of a bell crank 18, which is fulcrumed at its elbow between the upper ends of two upwardly extending posts 19 and 24, rising from the boiler (if the engine is mounted on the boiler) or from the engine frame. The lower arm of the bell crank carries a wrist pin 21, which works in the slot 22 of a lever 23. The lever 23 is fulcrumed intermediate of itsends between the lower ends to the posts 19 and 24, and a link 25 is connected at one end to the lower arm of the lever 23 and at its other end to a hand lever 26 adapted to coact with the ordinary tooth sector 27. I

If desired, as shown in Fig. 1, the bell crank 18 may be fulcrumed at its elbow between the posts 19, rising from the boiler or from the engine frame, and the con necting link 25 may be attached at one end directly to the lower arm of the bell crank 18.

The axis 6 of the oscillating block 5, is located at equal distances from the ends of said block and at right angles to its length and also at right angles to the line of movement or traverse of the valve rod and the slotted yoke 13 is located immediately in front of the axis of said block 5 and with its center and slide or slot exactly on a line with said axis, with the yoke standing parallel to the block and at right angles to the axis thereof.

In the practical operation of my improved valve gear, when the reversing lever 26 is on the center, it results in placing the dove-tailed head 8 of the coupling pin 9 in the center of the dove-tailed guides 7, on the side of the oscillating block 5, while the coupling pin 9 is in the center of the antifriction block 12, the latter being in the center of the yoke 13. Hence as all of these parts are on a common center, a complete cut off is established and the valve 17 is held at a neutral position, that is, the center of the valve seat. When the hand lever 26 is thrown in one direction, the stirrup 10 will be raised thereby, causing the antifriction block 12 to be carried upwardly to the top of the yoke together with the dove-tailed head 8 of the coupling pin 9, which latter passes up the guides 7 on the side of the oscillating block 5 to the highest point. This will manifestly result in opening one of the valve ports, to start the engine in one direction. Obviously, then, the

movement of the hand lever, 26 to the opposite direction, will carry the stirrup 10 downwardly, so as to move its antilriction block 12 to the lower end of the yoke and consequently, the movement of the eccentric will cause the other steam port to first open and start the engine on a reverse movement.

From the foregoing description, in connection with the accompanying drawings, it will be seen that I have provided a very simple and effective construction of valve gear, which may be applied to all types of engines, using either slide or oscillating valves, either new or old, by attaching the shaft or rod 3 to the eccentric strap and forming the necessary bracket adjustments.

Having thus described the invention, what is claimed as new is:-

extending guide way, a coupling pin slidingly mounted in said guide way, and extending into the slot of the yoke, a stirrup embodying two arms embracing said yoke and carrying at one end an antifriction block working in said slot and encircling said coupling pin, a bell crank ful crumed at its elbow and having one arm connected to said stirrup, the other arm of said bell crank being provided with a wrist pin, a lever fulcrumed intermediate of its ends and provided at one end with a slot accommodating said wrist pin, supports for the bell crank and said lever, and a hand lever, operatively connected to said first named lever.

2. The combination with an engine, provided with a steam chest valve and valve rod and eccentric, said valve rod being mounted to have a reciprocating motion, of a slotted yoke connected to said valve rod, and movable therewith, a rod connected to the strap of the eccentric, an oscillating block, a support therefor, said block being provided with a bore through which the rod extends and by which it is oscillated, a stirrup having an adjustable engagement with said slotted yoke and with said oscillating block, and means for holding said stirrup at different points along the slot of the yoke and the said block.

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

SAMUEL W. LONG. [L. 8.]

Witnesses:

J. H. MATtrnsoN, J. E. MORRIS.

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