US1296580A

US1296580A - Manufacture of spring packing-rings for pistons and the like.

Info

Publication number: US1296580A
Application number: US20344117A
Authority: US
Inventors: George Woodvine
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-11-22
Filing date: 1917-11-22
Publication date: 1919-03-04
Anticipated expiration: 1936-03-04

Description

APPLICATION HLED NOV-22. I9]?- Patented Mar. 4, 1919.

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0 d I E a V INVEN7'0R GEORGE. Waadv/m:

l G. woonvms. MANUFACTURE OF SPRING PACKING RINGS FOR PISTONS AND THE LIKE.

APPLICATION FILED NOV. 22, I91].

1,296,580. Patented Mar. 4,1919.

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INVEA/TOIT GIL-0R6 6 W000 VINE 1'7 TTORIVEl J G. WOODVINE. MANUFACTURE OF SPRlNG PACKING MNGS FOR PISTONS AND THE LIKE.

APPLICATION FILED NOV. 22, 917. 1 ,296,580. Patented Mar. 4,1919.

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MANUFACTURE 01" SPRING PACKING-RINGS 1'03 PISTON! AND THE mm.

, Specification of Letter: Patent.

Patented Mar. 4, 1919.

Application fled November 28. 1817. till lie. $08.44!.

To all whom it may cmwem:

Be it known that I, GEORGE Wooovmn, a subject of the King of Great Britain and Ireland, and a resident of Shrewsbury, in the county of Salop, England, have invented certain new and useful Improvements in the Manufacture of S ring Packing-Rings for Pistons and the li e, and of which the followin is the specification.

' This invention relates to divided sprin acking I'll)? has for its 0 ject to impart to such rings in an improved manner the necessary spring to cause them when in position on the piston, to bear with the required uniform pressure a inst the inner wall of the cylinder in w 'ch the piston works.

Hitherto to attain this object such rings have been subjected to unequal compression by hammering or rolling, the compression and gradually dimims \ing toward these ends and being applied either to the internal or the external surface of the ring according to whether it is desired to expand or contract the. ring.

According to the present invention the is turned and bored concentric and also l'lIl split as usual, and where it is desired to exand the ring it is then laid in a holder or is and the inner periphery subjected to pressure by pushing through the ring a roach or mandrel having on its periphery a series of pro'ections arranged eccentric to the body of t e mandrel in such manner that the maximum projection bears on the inner surface of the ring at the point opposite to the cut ends thereof, the projections adually diminishing from this oint in gdth directions until they finally disappear at points a little distance away from the part of the mandrel adjacent to the cut ends of the ring, the mandrel bearing on the ring at this part. Thus on pushing the mandrel throu h the ring the metal on the inner surface t ereof is indented and stretched by the projections in a gradually diminishing degree in both directions from the point opposite to the cut ends and the desired spring is thus imparted to the ring.

Where it is desired to contract the rin it is placed around a solid holder or die, an a hollow broach with the eccentrically placed rejections on its inner periphery is need.

us on pushing the broach over the for pistons and the like; an

osite to the the rejections are made to bear on the outer Eur ace of the ring instead of the inner surace.

The broach or mandrel may be constructed in various ways. For example the projections thereon may take the form of a number of steel balls held in a groove. which is eccentric to the body of the mandrel. Or the rojections maybe in the form of teeth gra ually diminishing in effective radial depth from the maximum actin on the inner surface of the ring at the point opposite to the cut ends thereof, and held in recesses in the peripher of. the mandrel. That is to say1 the test may be of gradually diminis ing depth and the recesses uniform in sizes, or again the teeth may be of uniform de th and the recesses of varying depths.

hree sheets of explanatory drawings are hereunto a pended in which Figure 1 is a plan and ig'. 2 a vertical section showing an exam le of the improved means used to expand t e packing rings, a second example is shown to a larger scale in plan in Fig. 3; while Fig. 4 is a vertical section and Fig. 5 an inverted plan showin an exam le of the improved means used w ere it is esired to contract the packing rings.

As shown in Fi 1 and 2 there is provided a hollow hol er or die A having an internal stepped portion of such depth that a number of packing rings B may be laid therein, one above the other, the rings having been, of course, first turned and bored concentric and also split as usual. The radial depth of the stepped portion of the holder'A relative to the thickness of the rings B is such that, as shown, the internal diameter of the rings, when the are in position in the holder, is slightly ess than the internal diameter of the lower portion of the holder. The rings B are held ivnvplace in the holder by a cover plate 0. 1th this holder A there coacts a breach or mandrel made in two portions D, E held to other by studs G. The meeting edges of t ese two portions are so shaped as to form a groove H eccentric to the body of the breach in which groove are balls J which form a ring of pro ections also eccentric to the periphery of the breach. To expand the rings B, the breach D, E is so forced through the holder A that the maximum projection J bears on the inner surface of the rings in the holder, at the point opposite to the cut ends of the rings,

the projections goadually diminishi from this point in th directions unti they finally disappear at points a little distance awa from t e part of the broach adjacent to t e cut ends of the ring at which part the periphery of the mandrel bears on the inner surface of the rings. The metal on the inner surface of the rings is indented and stretched by the projections J in a gradually diminishing degree in both directions from the oint opposite to the cut ends, and the desires spring is thus imparted to the rings. f

The example shown in Fig. 3 difl'ers from that hereinbefore described only in that the projections J are in the form of teeth gradually diminishing in effective radial de th from the maximum acting, as hereinbe ore described, on the inner surface of the rings B,'in the holder A, at the point opposite to the cut ends thereof, and held in recesses K in the ripher of the breach. As s wn in i igs. 4 and 5-, when the rings B are to becontracted they are placed around a solid holder L and held in place by a cover plate C and a hollow 'broach D,.E, withthe eccentricall placed ball pro'ections J on; its inner peri ery, is used. T us on pushing the broac over the rings the pro ections bear on the outer surface of the rings instead of the inner surface, the broach being so placed relative to the rings that the maximumprojection bears on each ring at the point op osite to thecut 'ends thereof.

What claim is 1. In 1:35 manufactiire of cut or split 5 rin 'n rin or pistons and t e 15m, E h dlder rece iire the rings and a tool comprising a body portion carrying rojections arranged eccentric to the body t ereof in such manner that when applied to the rings the maximum projection ears on each ring at the point opposite to the cut ends thereof, the rojections gradually diminishing from the point in both directions until theyfinally disappear at points a little distance away from the part of the tool adjacent to and adapted to bear upon the cut ends of the rings, as described.

2. In the manufacture of cut or split spring packing rings for pistons and the nuance like, a holder to carry the rings, a tool comprising a body portion, lprojections thereon in the form of steel he] s held in a groove eccentric to the body of the tool, the tool being so applied to the rings that the maximum, projection bears on each ring at the point opposite to the cut ends thereof, the pro ections adually diminishin from this omt m b0 h directions until t ey finally reappear at points a little distance away from the part of the tool adjacent to and adapted to bear upon the cut ends of the rings as described.

8 in the manufacture of cut or split Baring packing rings for pistons .and the l1 e, a hollow older in Wl'llCl'l the rings are laid, a tool comprising a body portion, projectlons arranged eccentrically on the outer periphery thereof, the tool being so forced through the rings that the maximum projection bears on the inner surface of each ring at the point opposite to the out ends thereof, the projections radually diminishing from thls point in bot directions until they finally disappear at points a little distance away from the part of the tool adjacent to and adapted to bear upon the cut ends of the rings as described.

4. in the manufacture of cut or split s iring packing rings for pistons and the 11 e, a hollow holder in whichthe rings are laid, a tool comprising a body ortion projectlons on the outer riphery t ereof 1n the form of steel balls he d in a oove eccentric to the body of the broach, t e broach being so forced through the rings that the maximum rojection bears on the inner surface of sec ring at the point opposite to the cut ends thereof, the projections gradually diminishing from this point in both directions until they finally disappear at oints a little distance awa from the part 0 the tool adjacent to an adapted to bear upon the cut ends of the rings, as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

GEORGE W'OODVINE.

Witnesses:

ANDREW Soonnm, B. K. Hoos'ron.