USRE6128E - Improvement in piston-packings - Google Patents

Description

UNITED STATES PATENT EEICE.

THOMAS S. DAvIs, 0E JERSEY CITY, NEw JERSEY.

IMPROVEMENT IN PlSTONfPACKING/S.

Specification forming part of Letters Patent No. 31,303, dated February 5, 1861; reissue No. 6,128, dated I November 10, 1874; application filed August 14, 1874.

To all whom it may concern:

Be it known that I, THOMAS S. DAVIS, of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and useful Improvement in PistonValves and other Pistons; and I do hereby declare that the following is a full, clear, and exact description ot' the same, reference being had to the accompanying drawings, forming part of this specification, in which- Fgure 1 is a side view of a piston-valve constructed according to my invention. Fig. 2 is a central section ot' the same. Fig. 3 is a transverse Section orn the Same, and Fig. 4 is an end view ofthe packing-ring.

This in vention is'more particularly designed for piston-valves, but it may also be used in other kinds of pistons. It consists in certain novel means whereby the piston is made as nearly as possible like a solid block, and yet capable of adjustment to lit the cylinder' in" which it works, as required, by expanding or setting out the valve to compensate for wear, in a non-elastic manner.

To enable others to make and use my invention I will proceed to describe its construction and operation.

A is a single ring, of cast-iron, brass, or other metal, of a depth equal to the whole depth of the piston turned externally to a cylindrical form to iit the cylinder, and having its interior turned out at one Side concentrically to its exterior, as Shown at a a in Figs. 2 and 4, for the reception within it of the flange b of the Solid head B ofthe piston, and turned out at the opposite side in a similar manner, as shown at c in Fig. 2, for the reception of the follower C. The said ring has cut in its eXterior, at any point in its circumference, a taper dovetail groove, d d, for the reception of a dovetail wedge, D, which is to be movable parallel with the piston-rod, and from the middle ofthe back of the said groove the said ring is cut through, as shown at ein Figs. 2, 3, and 4, to permit it to be set out by the dovetail wedge, the outer face of which combines with the periphery of the ring, to make a complete cylinder. The solid lianged head B is driven tightly on or otherwise iirmly Secured to the rod, and the follower C is fitted to the rod, and secured by a nut, Gr, itted to a screw-thread on the rod, the Said nut holding it close up to the face of the head B and to the Shoulder, at the back of the recess c.

The liange B has projecting from its periphery a shortpin, f, to enter a notch, g, in the interior of the recess arof the ring, and the follower C has a similar pin to enter a similar notch in the recess c.

These notches and pins prevent the head B of the follower C and ring a from turning independently of each other. The head B and follower G are received entirely within the ring A, so that the peripherical surface of the piston is unbroken, except at the junction ot' the wedge B, and the piston is practically a solid non-elastic block, though it can be eX- panded and set out against the interior of its cylinder, as required to make it lit and compensate for wear, by means of the Wedge D.

To provide for the convenient adjustment of the wedge D I employ a screw, H, screwing through a tapped hole in a lug, h, atl one end ofthe wedge, and having a journal, i, so tted to a bearing in the ring C as to be capable of turning freely, but not moving longitudinally. This screw is fitted with a jam` nut, j, to Secure the wedge in any position in which it may have been adjusted.

Instead of dividing the ring in one place only, and using a single wedge, I propose in large pistons to divide the ring in three or more places, and use a corresponding number of wedges.

What I claim as my invention is- 1. The combination, in a piston-valve or other piston, of a divided ring and a wedge, having its motion parallel with the aXiS of and flush with the periphery of Said ring, for varying its diameter, substantially as specied.

2. 1n a pistonvalve or other piston, constructed with a single expanding and adjustable ring, the combination of the head B and follower c, furnished to its interior, and one or more wedges, D, thewhole arranged for joint operation, Substantially as and for the purpose set forth.

THOS. S. DAVIS.

"Witnesses:

JAMES A. WHITNEY, WM. EDWARDS.

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