US101886A - Kendall - Google Patents

Description

A. KENDALL.

Valve Gear.

No. 101,886. Patented April 12, 1-870.

"1115mm mun-luv 1 dhtitul $121125 13mm define.

AnomnAn KENDALL.

or oLEvEnaNn, OHIO.

Lettecs Patent No. 101,886, dated April 12, 1870.

CUT-OFF AND STEAM-VALVE.

The Schedule referred to in these Letters Patent and making part of the same ofi and'Steam-Valve Combined; and I do hereby declare that the following is a full and complete description of the construction and operation of the same, reference being had to the accompanying drawings makinga part of this specification, in which- Figure 1 is a front view of the apparatus.

Figure 2 a. side view.

Figure. 3 a vertical section. .1

Figures 4, 5, and 6 are detached sections. 1

Figures 7 and 8 are detached views of a valve to which reference will be made.

Like-letters of reference refer to like parts in the several views presented.

The nature of this invention relates to a cut-off, as

applied to a steam-engine, whereby a certain portion of the steam is prevented from entering the cylinder, the same being operated by certain devices hereinafter more fully described.

In fig. 1, A represents the valve, which is of cylindrical shape, the size being greater or lesser, as the capacity of the engine may require.

In the lower part of this chamber is a valve-seat, B, fig. 3, having side ports or openings 0 directly comrhunicating with the steam-space 1),- immediately under the valve-seat, through the steam-ways E, fig. 6, which represents thebottom of the seat.

E, fig. 3, is the valve, the lower part of which is fitted in the seat B,'whereas the'upper part fits the 'chamber. I

G, fig. 2, is a rock-shaft passing through the chamber and valve, as indicated by the dotted lines a.

To said shaft is secured a lug, H, fig. 3, whereby the valve is operated, as will presently be shown.

To the outer end of the shaft is secured a disk, I, fig. 5, in the face of which is arranged a pair of slides J K, provided each with a pin, I).

Said slides are retained in place by a face-plate, L, fig. 1, through which the pins b project, as shown in fig. 2, slots being provided for their admission, and whereby the ends of the slides are allowed to descend below the edge of the disk, and also prevented from falling therefrom.

0, fig. 2, are also pins, proceeding from each slide, and projecting through the rear side of the disk through 5 slots provided for their admission.

0, fig. l, is alever, one end of which is pivoted to the governor-rod-P, whereas the opposite end projects forward and under the pins 0, fig. 2, the purpose of which will hereinafter be shown.

Q is also a lever, pivoted to the chamber at the point X, and cofmected to the lever O by means of the link R. One end of said lever is pivoted to the lower end of the rod P, whereas the other reaches out beyond and back of the oscillating lever M, the purpose and operation of whichwill presently be shown. Having thus described the construct-ion and arrangement of the cut-off, the practical operation-of the same is as follows:

The apparatus is placed in the steam-pipe at any desirable point near the steam-chest and cylinder, in

the position as shownfin fig. 1. i The rod P is then attached to the governor and the lower end of the oscil lating lever M to the eccentric. On the engine being put in motion, the valve F is lifted by means of the lug H, operated by the rock-shaft G. Thus, the valve, 7

as shown in fig. 3, represents it as being closed, in which position the disk and slides will be as shown in fig. 4, vertical. Now, as the oscillating lever is moved.

in direction of the line c, it will turn the disk to the position shown. in fig. 5, by the upper end or head of the lever engaging with the projecting ends of the slide K, which will lift the valve by the lug'H, as indicated by the dotted lines f. At this time the steam, passing in at the top of the chamber at S, descends through the valve to the ports 0, out of which, through the openings E, fig. 6, in the bottom of the valve-seat, thence through the pipe '1. to the cylinder. At this time the lever becomes disengaged from the slides K, and the disk and slides immediately assume the position first indicated in fig. 4;, by the current action of the steam upon the valve, thereby closing 'it, thus shutting 011 the steam from further admission to the cylinder. The valve is again opened by the reverse action of the eccentric, causing the oscillating lever to engage in the slide J, which turns the disk to the opposite position of that shown in fig. 5, indicated by the line 0, and shown in fig. 1, thereby iaising the valve bythe lug H, thus allowing. the steam to enter the chamber, and through the valve to the cylinder, as before, and as indicated by the arrows, and so on, as longas the engine continues to run, the valve being openedalternately by each lug, as they are made to operate by the rock-shaft actuated vby the oscillating lever, 850.

The amount of steam admitted to the cylinder is regulated by the governor thus:

As aforesaid, it is connected to the rod P. Now, as the governor expands or falls, the result will be to opcrate-the lever 0, one end of which being under the pins 0 and the other'attached to the rod, theslides' will, in consequence, be lifted by-the lever more or less, and thus causethc hold of the lever upon them of shorter duration, thereby lessening the vibration of the rock-shaft, which, as a consequence, shortensthe throw of the valve, thereby shutting ofi' more or less steam in proportion to the action of the valve. \Vhen the steam is low, a full throw of the valve is obtained, as the lever does not lift the slides, so that the engagement of the head of the oscillating lever with them is at its maximum; per cont/m, when the steam is high, the lever raises the slides, thereby reducing the throw of the valve by lessening the engagement of the lever upon the slides.

The valve may be operated byhand by means of the lever A, fig. 1, said lever being attached to the rock-shaft by means of a ring or collar, B. On raising the lever, an enlargement of the collar by passing under the pins 0 forces them upward, thereby lifting the slides, thus regulating the engagement of them with the oscillating lever, or holding them entirely within the disk and allowing the engine to work with-, out the influence of the governor. 0n lifting the valve, a chamber is found between the seat and the shoulder of the valve, which, being filled with steam, serves to lessen the blow upon the seat.

In order to lessen the percussion of the valve upon the seat, a slight groove or chamber, a, fig. 3, is sunk in the valve-seat, into which the lower rim of the valve drops. This chamber or groove being filled with steam, the valve is thereby cushioned, thus easing its stroke. upon the seat. A similar groove is also sunk in the under side of the upper section of the valve, at 7), into which the upper rim of the valve-seat fits, and which, in like manner, being filled with steam, assists in releasing the valve from striking with too much force upon the seat, thereby lessening the noise and consequent wear of the valve.

Instead of regulating the engagement of the oscillating lever with the slides by means of the lever O, the same result may be obtained by depressing the arm N to which the lever is pivoted, this arm being secured to the chamber A by means of a slide, 0', fig. l, which permits to it a ertical movement, and which is given to it by the lever Q by removing the screw h and inserting the same in the end of the lever at 'i. As thus arranged, on depressing the lever of the governor-rod, the arm and pawl will be curved down, more or less, away from contact with the ends of the slides, which will actuate them correspondingly.

Figs. 7 and 8 represent a modification of the valve, which may be used instead of the valve above described, the difference in the two valves being that the latter has ports in the sides for the passage of the inducted steam.

What I claim as my invention, and desire tosecure by Letters Patent, is

1. The valve F and seat B, as constructed and arranged in relation to each other, and in combination with the shell or chamber A, substantially as described.

2. The disk I, in combination with the shaft G and lugs H H, as specified.

3. The slides J K and pins b c in combination with p the disk I, substantially as set forth.

4. The oscillating lever M, disk 1, slides J K, shaft G, and lugs H H, when combined and arranged in relation to each other so as to co-operate-conjointly, substantially as described.

5. The lever O, as arranged, in combination with the pinsc and slides J K, as specified.

6. The annular chambers or recesses a b, as arganged in relation to the valve '1! and seat B, as set orth. AD ONIRAM KENDALL.

Witnesses:

J. H. BURRIDGE, FRANK S. ALDEN.

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