US1092201A - Piston packing-ring. - Google Patents

Description

R.L.BURD.

PISTON PACKING RING.

' APPLICATION FILED my 6, 1913..

1,092,201, Patented Apr. 7, 1914 V larly for use in mice is to be had to To all whom it may concern EOY L. BURD, OF CHICAGO, ILLINOIS.

rrsron 'PACKINQBING.

Specification of Letters Patent. I

Patented Apr. a, rat a,

Application filed May 6, 1913. Serial No. 765,750.

Be it known that I, ROY L. Bonn, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Piston Packing-Rings, of which the following is a specification.

My invention is designed more particuconnection with pistons of explosive gas engines, though it will be obvious from a consideration of the detailed description anddrawing that it is likewise applicable to many other forms of pistons and similar constructions where metallic packing is desired. As is well known to those familiar with explosive and expansion engines, where a metallic packing ring is 'required, the piston is circumferentially grooved at one or more points and a split packing ring fitted snugly within the groove, with its meeting ends sutliciently separated to permit expansion of the ring under heating. The opening, however, provides a path for the gases or fluids from one side ofthe piston to the other, which steadily increases with wear thereby materially lowering the efiiciency of the engine and ultimately re-' .quiring the repairing of the piston, as is well known'to those familiar with this class of machines, Various means have been adopted or suggested for obviating this difficulty, one of the most common of which is the use of a plurality of rings in which the splits oropenings are located as nearly as may be on opposite sides of the piston;

While this ameliorates the difiiculty to some extent, the construction permits the fluids to pass the first ring and by traversing the groove to the other side of the piston, escape the second ring. It

throughthe opening of or bridge the has also been proposed to join ends of the ring in various ways an ferent devices to prevent the passage of fluids through the cut.

My invention belongs 'to this latter class of ring construction and has certain advantages over those heretofore employed, which witlabe apparent from'the drawmg and detailed description.

While I have illustrated and described the preferred form of my in specifically vention, I have done so for the purpose of exemplification only, for it will be apparent that the invention may be embodied in other forms a for the scope of the inventionreferthe following claims,

, C, forming a rectangular shoulder d by f done in the same same in such terms as to distinguish it from the pI'lOI art, so far as is known to me without, however, relinquishing or abandoning any portion thereof. a

Referring now to the accompanying drawings, Figure 1 is an elevation of a packing in which I have endeavored to point out the i ring embodying thepreferred form of my invention; Fig. 2 a fragmentary view on an enlarged scale showing the joint after the r ng has worn considerably; Fig. 3, is a sec-' tion throughthe joint of the ring on the plane of the line 3-3 of Fig. 4 onan enlarged scale; Fig. 4 is a view of the same taken at right angles to the plane of Figs, 1 and 2; and Fig. 5 is a perspective-showmg the meeting ends of the ring and the bridge or con ling device detached. 1 The same 0 aracters of reference muses for the same parts Wherever they occur in the several views.

The shape of the various parts is best shown in Fig. -5, in which it is seen that the meet ng ends A, A are undercut at B, B and rabbetedfuponopposite sides, as at C, D D which is secant to the outer periphery of the ring, a tongue E, E being left intermediate the shoulders-uponeach endfof the ring. The piston ring-may be formed in any of a variety of ways, but preferably by casting a hollow cylinder of gray .iron or suitable metal which is chucked in a lathe, turned and bored, and the rings out there. from of the necessary width and thickness. The 'rings'are then ground on the sides to finished size, preferably on a magnetic chuck, and split together in circular form, diameter, used to rabbet the opposite corners of the outer faces of the ends, forming the rectilinear shoulders D, D referred to above, and the undercutting 'of the tongues will be The ring is then sprung ground to finished simpleoperations,

the packing ring proper is completed.

and a set of straddle mill cutters,

The bridge piece or coupler is preferably formed of a metal somewhat softer than that of the ring, as for example, of brass, for areason which will appear later, and where the coupler is small, it may of sheet metal and struck" up to the required shape. large, however, the former can be made to, advantage by milling out from a suitably be stamped out In case the ring and coupler are-1mp setting. By these very. I l

v upon the shoulders D, D

shaped bar. The completed, bridge or coupler comprises the side members H, H which are curved on their outer edges to conform to the curvature of the packing ring, and rectilinear on their inner edges, which are adapted to fit within the rabbets formed upon the ends of the ring and seat thereof. A tiebar or cross-piece J connecting the members H, H extends beyond the plane of the rear edges of the side members, and when the bridge is in operative position, occupies the cross channel formed by the undercutting of the ends of the ring at B, B, as above described.

The ring is assembled with the piston in much the usual manner, the bridge piece, however, being adjustedto the ends of the ring after it is slipped into the groove protlons required,

vided for it in the piston. It will be seen that with a ring constructed according to my invention, leakage directly past the opening or around the back of the ring is prevented, and the bridge is maintained in proper contact with the wall of the cylinder by the pressure of the ring ends, and is therefore independent'o-f the gas pressure within the cylinder. As the ring wears, the coupler is fed outward against the cylinder wall he resilience of thering, the shoulders on theends of. which act against the side members of the coupler, as seen in Fig. 2

of the drawing and as the ring opens by ,wear the coupler, being of softer material, is forced to wear and maintains the fit against the wall of the cylinder. On the other hand, the tie-bar passing behind the reduced ends of the tongues, prevents the coupler being forced out by the pressure and thereby wearing faster than the ringQitself. Furthermore, the tongues of the ring are always protected by the coupler and the walls of the piston groove, and therefore the danger of breaking them off is avoided.

-By reason of the simplicity ofthe construction and thenature of the few operapiston rings may be made according to my invention at a low cost of manufacture and used much longer than heretofore, before renewal is required.

I claimz' l. A split packing ring for pistons and the like, having the ends thereof rabbeted on their convex faces to form shoulders, a coupler comprising a member fitting upon the shoulders and a portion extending under the ends of the ring whereby both outward and inward movement of the bridge piece relative to the ring ends is limited.

2. A split packing ring for pistons and the like, the meeting ends away to form shoulders on the same plane secant to the outer circumference of the ring, and a coupling having members with straight inner edges adapted and arranged to overlie said shoulders, and a portion extending beneath the meeting ends of the ring.

3. A. split packing ring for pistons and the like, having the opposite ed es of the convex faces of its ends rabbeted to form longitudinal shoulders, a coupler comprising a pair of longitudinal meinbers fitting upon said shoulders, and a cross-member extending beneath the ends and securingthe longitudinal members together.

4. A split packing ring for pistons and the like, the ends of which are rabbeted on their exterior edges to form shoulders cut away interiorly, tudinal members adapted to rest upon said shoulders, and a cross-member connecting the same and adapted to underlie the cutaway portion of the ends.

- 5. A split packing ring for pistons and the like, having its outer edges rabbeted to form longitudinal shoulders in a common plane secant to the outer circumference of the ring and under-cut to form a transverse groove or passage formed partly in each end of the ring, and a coupler comprising a pair of longitudinally extending members adapted to-fit within said rabbets, and a transverse member adapted to extend beneath the ends of the ring within said groove.

ROY L. BURD.

lVitnesses JOHN B. MA AULEY, ROBERT DOBBERMAN.

of which are out.

a coupler having longi-'

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