US80644A - Philander macy - Google Patents

Description

@einen ,tetra getreu i Letters Patent No. y80, (34;4,olatel August 45,1868.

IMPROVEMENT IN VALVE-ARRANGBMENT.

@In rigcmle referrer .te in there ttntt atntt mit mating pit-tt af tige' time;

TO ALL WHOM IT MAY OONGERN:

Be it known that I, PHILANDER MACY, ofltochester, in the county of Monroe, and State of New York, have invented certain new and useful Improvements in Valve-Arrangementsfor steam. and other engines; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings,.making part of this specification.

Figure 1 is a longitudinal sectional elevation of my improved arrangement.

Figure2, a perspective view of thc valve detached.' I

Like letters of reference indicate corresponding parts in both figures.

My invention consists in a slide-valve so arranged as to avoid in a great degree the pressure ofthe steam, and operating to open and close theports by the direct action of the piston-headitself,.without the use of eccentrics or other attachments, whichare ordinarily employed.

It also consists in a lever-and-'spring'arrangement for reversing the engine while under motion, and a turning-hook for attaching to thevalve to move it in any desired'position.

In the drawings, A indicates the cylinder of a steam-engine; B, the piston-head working therein ;4 C, the piston-rod; D, the pitman; E, the crank, and G the balance-wheel. These parts do not dii'er essentially from the corresponding ones in ordinary use.

On top the cylinder is bolted a plate,H, holding the'induction-valve I, whichadmits the steam to the cylinder through space a and ports b b. The exhaust is carried o through passages e e.

' Beneaththe plate H rests a slide-valve, K, which shifts alternately to cover the ports. The central portion of this valve, resting under space a, is made open, as shown at d, fig. 2, and the endsff thereof rest and slide closely under ribs g of4 said plate, to cut of the escape of steam from space c t, except through the ports, as before stated. l

The ends-of the valve are provided with downwardly-projecting lugshlt L, vwhich pass through the ports, and extend thro-ugh suilciently to bc struck by bearings'z' z', secured on opposite sides of the piston-head, so that at each stroke the said valve will be .made to cover and uncover the ports b-y this action alone.

At the extremity of the strokes, the lugs strike into notches b b of the ports, in order to give the full movement, and these notches are covered by oii'sets 'le c, at the nds of the va1ve, as clearly represented in iig'. 2';

By arranging the valve as above described, and operating it by the positive action of the piston-head itself,

without auxiliary parte, I'dispensc with the ordinary eecentries, connecting-rods, and-otherl devices that have vheretofore been employed to operate the-valve, ancl'reduce the .arrangement tothe simplest form. The construction is so simple, andthe parts are so few, that it is not liable to derangementof any kind.

The making of the opening (Z in the valveA removes the great pressure of steam from its surface, and thus renders it capable of easy action under all circumstances.` lVerc the full pressure upon the valve, it might be diicult to operate it easily by the piston-head without breaking the llugs-7th; as it is, nodiculty can occur from this source.I

A lever, L, is piroted at Z to thc head of the cylinder, having bolted thereto, .at m,ra spring, n, composed of one or more leaves, and extending upwards to a suitable height, as shown. With this is connected, at o, a

rod, M, having handle j), and extending inward loosely through the lever and plate H, so as to rest opposite a bearing, fr, of the ,end ofthe valve. The end of the rod is turned into a hook, s, and a. little back of this is a collar, t, as clearly shown in Iig. 1f

The object of this arrangement-is to throw thevalve, whenever it is desired to reverse the engine or othcrwise. The reversal is accomplished with ease and safety,whiie the engine is undermotion-an elect, so far as I am aware, which cannot be accomplished in any other engine. To reverse, it is only necessary to press-the lever inward to the'position indicated in red lines, when the collar t, striking bearing r, throws the valve to the opposite position at once. While this' is being'gaccomplished, the knocking or rapping that occurs from the i rapid reciprocations of the valve is expended upon .the springn, and not upon the lever through which the rod M runs loosely. A

Thus it will be seen, I can produce the reversal of the engine under full motion instantly and without danger. In other engines, the steam must be turned olf-before this can be accomplished.

In 'ordinary use, the hook sis turned up as in fig. 1, but when it is desired to move the valve back from vits farthest position, and at any time when it is desired to obtain full control of it, the hook is turned down back of bearing r, which bearing, thus confined between s and t, placesthe valve fully under control.

WhatIelaim as my invention, and desire to secure by Lletters Patent, is '1. The construction ofthe valve K with opening d, bars ff, lugs ZL-t, offsets lac, and projection r, as herein set forth. l

2. The combination of the rod M, provided-with*the'turninghook s andcollar t, and the lever L and spring n with the valve K and its projection @operating substantially in the manner and for the purposes specified.

In witness whereof, I have hereunto signed my name inthe presence of two subscribing witnesses.

' PHILANDER MACY. Witnesses:

J. A. DAvIs, R. F. OsGooD.

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