US384272A

US384272A - Jefferson patten

Info

Publication number: US384272A
Authority: US
Publication date: 1888-06-12
Anticipated expiration: 1905-06-12

Description

(No Model.)

J. PATTEN.

METALLIC PACKING FOR STEAM CYLINDER PISTONS. N0 384,272.

Patented June 12, 1888.

WITNESSES: IIVI/ENTOR W Y Y A TTORIVE Y UNITED STATES PATENT O FICE.

. JEFFERSO PATTEN, OF BROOKLY NEW YORK.

METALLIC PACKlNG FOR STEAM-CYLINDER PISTONS.

SPECIFICATION forming part of Letters Patent No. 384,272, dated June 12, 1888.

Application filed March 17, lBB.

Serial No. 267,469. (No model.)

To all whom it may concern.-

Be it known that I, J EFFERSON Pn'r rsma' citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Metallic Packing for Steam-Oy1inder Pistons, of which the following is a specification.

The object of my invention, which .is dis closed in the following description and claims,

' is to provide a perfectly steam-tight metallic packing for the pistons of steam-cylinders by constructing-the metallic rings forming the packing and combining them with the pistonheadjin 'such a manner .that'the steam in-the cylinder will be admitted under the packingrings, which will be pressed outward against Y the inner surface of the cylinder, and thereby insure a close fit and steam-tight connection between the packing and cylinder,while at the same time allowing for the easy movements of 1 the piston.

To enable others skilled in the art to construct and use my improvement, I-will proceed to describe its construction and operation by the aid of the accompanying drawings,in which like letters of reference designate like or equivalent parts wherever found throughout the several views, and in which- Figure 1 is a central vertical section of a piston providedwith my improved packingring; and Figs. 2aud 3 are face and side views, respectively, of the ring.

In the drawings, a is the piston-head; b, the piston or bull-ring; c, the piston-shaft, and d,

. the plate'or'follower, which is secured to the head a, and by which the pistonui'ng b and packing-rings e are held in place.

g The outer rim of the head a'is cutaway, as shown, in such a manner as to leave a flange, d, on'one side, and within or upon this cut-away portion is placed the ring b. 1

The ring b is provided with circumferential grooves or recesses b, which extend a determined distance below the outer surface or edge of the flange d and the follower'd when these parts are in position. The ring 6, which forms the principal feature of my invention, is substantially rectangular in cross-section, and is provided on one of its front or pressure sides and on the inner face or side with corrugations, as shown, the corrugatioiis on the outer or pressure side and those on the inner face or side being'in communication or coincident. Ata point, as e, the ring e is cut, and one end thereof is provided with a tongue, h, which is secured thereto by rivets, as shown, and the other end movably fits within a groove, h, formed in the opposite end of the ring. The

ring-e may be made of any metallic substance preferred, and the tongue h should be made of some metal having a higher degree of expansion under the influence of heat than the material of which the ring is composed. This is not, however, absolutely necessary, as it is evident that the parts may be made of the same material and operate successfully. The

outer edges ofthe packing-ring may also be The packing-rings e should be made of such thickness that they will be held closely and firmly by the flange d and the follower d when the latter is in place. With this construction the friction-surface on the front or pressure side of the packing-ring is reduced by means of the corrugations formed thereon. The corrugations on the under or inner face of the ring, coincident with the corrugations on the side thereof, increase the elasticity of the ring,

and also the surface area' of the inner face of the ring, upon which the steam'acts to cause the expansion thereof, whereby greater force to press the ring against the ,cylinder is ob mined, and I am enabled to employ a ring with much less impinging surface and still have a perfectly steam-tight fit between the cylinder and ring. Y

The operation has follows: When the piston is making its forward or upstroke in the direction of arrow i, the live steam rushes through the corrugations at m on the side of the ring e down and into the corrugations on the under or inner face thereof, and its expansive force operating in said corrugation and upon the entire inner face causes the ring to expand and forces it outward against the surface of the cylinder, thus securing a perfectly steam-tight packing. On the reverse stroke of the piston in the direction of arrow k the operation is the same. The steam is forced into the corrugations at n, and passing into the corrugations on the under or inner face of this ring causes its expansion as in the first instance, and this operation or action of the parts is repeated as long as the engineis runmng.

I am aware that steam has been employed to cause the expansion of the piston-packing ringsin steam-cylindersby admitting the steam under the ring in various ways, that this has been done where two rings were used by causing the steam to press out the upper ring on the downstroke and the lower ring on the upstroke of the engine, and also by causing the steam to operate upon and expand both of the rings at once, and do not claim, broadly, such construction. It is evident, however, that corrugations might be formed upon the inner sur face of the flange d and the follower d, and upon the bottom of the grooves or recesses b, and the packing-ring made with plain surfaces without departing from the spirit of my invention.

Having fully described my invention, its con- Struction and operation, what I claim, and desire to secure by Letters Patent of the United States, is-

1. As an article of manufacture, a packingring for steam pistons, having its outer or pressure side provided with corrugations, whereby steam is admitted beneath the ring, substantially as shown and described.

2. As an article of manufacture, a packingring for steam-pistons, having its outer or pressure side and its inner face provided with communicating or coincident corrugations, substantially as shown and described.

3. The combination, with a steam piston provided with grooves or recesses, as b, of a packing'ring having its outer or pressure side radially corrugated, substantially as shown and described.

4. The combination, with a steam piston having grooves or recesses, as b, of apaekingring having its outer or pressure side and its inner or under face provided with coincident or communicating corrugations, substantially as shown and described.

5. The eombination,with asteam-piston having grooves or recesses, as I), of apacking-ring, as e, and corrugations for admitting steam at the side of and under the ring, substantially- JEFFERSON PATTEN.

Witnesses:

DANIEL E. DELAVAN, C. C. SKINNER.