US275955A - Piston-packing - Google Patents

Description

(No Model.)

W. W. ST. JOHN.

PISTON PACKING. 4

Patented Apr. 17,1883.

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UNITED STATES PATEN I Erica.

PISTON-PACKING.

SPECIFICATION forming part of Letters Patent No. 275,955, dated April 17, 1883.

Application filed August 518, 1882. (No model.)

To all whom it may concern Be it known that I, WILLIAM W. ST. JOHN, a citizen of the United States, residing at St. Louis, in the county of St. Louis and State of Missouri, have invented certain new and use ful Improvements in Piston-Packing; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in piston-packing; and the object is to produce a more perfect and economical piston-packin g, by which leakage of steam in the cylinder is prevented, while at the same time the piston can be readily centered and will wear evenly on its entire circumference.

The invention consists in a packing-ring of angular shape, with the flanged part made much wider or deeper than'the annular projecting face, so that it can wear off entirely before the flange can leave its recess in the pistonhead.

It also consists in a packing-piece having a tongue, which fits into a groove in the side of the packing-ring, whilea projecting pin enters a recess in the ring,-so that the ring and packing-piece must all move together, and thus prevent the main ring from slipping around on the piston, so as to expose the joint, all of which will be more fully described hereinafter, reference being had to the accompanying drawings and the letters of reference marked thereon.

Like letters refer to like parts in the different figures of the drawings, in which- Figure 1 represents a side elevation with the follower and packing-ring removed, and showing the packing -piece. Fig. 2 is a vertical cross-section of the same. Fig. 3 is a side view and section of the packing-ring. Fig. et is a side view and end view of the packing -piece. Fig. 5 is a modification of the piston.

In the drawings, A represents the pistonhead, which can be made solid for small pistons, or with arms, in the ordinary manner, and the follower A may be screwed onto the hub of the piston-head, or secured by bolts tapped into the holes a. The ordinary bullring B is provided with a centering-ring, O, which can be adjusted by bolts 0 in the cylinder. On each end of the bull-rin g is arranged a packing-ring, D D, which is of angular shape. In the side of the ring is a groove, (7. and the vertical part d is made deeper than the annular or flange part d, so that this part can wear off entirely before the part (1 will leave its place. The rings are cut as shown at h, Fig. 3, and into this cut a packing-piece, Edits. This packing-piece has a tongue, 6, that fits into the groove (1, while a projection or pin,f, enters the part b of the cut I), so that when the rings are forced out by the steam the packing-pieces must follow with them, while at the same time the main ring is prevented from slipping around on the piston so as to expose thejoint, and thus all leakage of steam is prevented. I prefer to place the packing-pieces at the upper side of the piston, so that the weight thereot'cannot compress the packing-ring, which it will do when the cut is at the lower side. The angular ring might be made with its vertical side less in depth or equal to the thickness of the radial flange, although I prefer to make it of greater depth. I also prefer to make the ring deeper than it is on its face, so that the steam will force it against the face of the bull-ring, thus giving it a greater area for the steam to act on, and pre venting the steam from forcing it back from the face of the cylinder.

In adapting this packing to old pistons I arrange it as shown in the modification shown in Fig. 5. The packingpiece E is in this instance inserted into a recess in the bull-ringB, with the pin flitting into the slot b in the packing-ring D to prevent it from turning.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,

1. In a piston, a packing-ring of angular shape, having the vertical part made of greater depth than the annular flange, and having a groove in its side, in which a packing-piece with tongue fits, substantially as specified.

2. In a piston, a packing-ring of angular shape, having part (1 of greater depth than flange d, and a groove, (Z, in combination with a packing-piece, E, provided with tongue 0 and projection or pin f, as shown, and for the purpose set forth.

3. In a piston, the combination of a packing ring of angular shape, having the vertical part (1 made deeper than the annuiar flange d, and. packing-piece E, provided with tongue 0 and provided with a groove, d, with a packingprojectionorpinf,allsubstantially as specified. 10

piece, E, having tongue 0 and projectionsf, fit- In testimony WhereofI affix my signature in ting into the cntb b,substantial1y as described. presence of two witnesses.

4. A piston consisting of the head A, hull- WILLIAM WV. ST. JOHN. ring B, packing ring 0, packing rings D D, Witnesses: having groove 61 and part (1 made deeper than A. '1. SANGSTON, flange d, and cut I) b, in combination with the LLOYD F. KELEHER.

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