Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS768136 A
Publication typeGrant
Publication dateAug 23, 1904
Filing dateMay 11, 1903
Priority dateMay 11, 1903
Publication numberUS 768136 A, US 768136A, US-A-768136, US768136 A, US768136A
InventorsJohn Murphy
Original AssigneeJohn Murphy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Jointed piston-head packing-ring.
US 768136 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

N0. 768,136. I v v PATENTED AUG. 23, 1904.




: E i E g i 11 lmullnlmm" 1 7' a .1 I F. J zy A W/TA/[S $59. I [AWE/V705,

. Jbim p y Patented. August 23, 1904.

PATENT owns. 4 I


JOINTED PISTON-HEAD PACKING-RING- SPECIFICATION forming part of Letters Patent No. 768,136, dated August 23, 1904.

Application filed May 11, 1903. Serial No. 156,546. (No model.) I i To all whom it may concern.-

Be it known that I, JOHN MURPHY, a citizen of the United States, residing at Parsons, in the county of Labette and State of Kansas, have invented new and useful Improvements in Jointed Piston-Head Packing-Rings, of

whichthe following is a specification.

invention consists inthe combination of three or more packing-segments with an interior spring which presses outwardly against the segments. p

The advantages of my herein-described packing over the usual one-piece packing-rings are: With my packing the pressure of the packing upon the cylinder is much less. With my packing the pressure of the packing upon the cylinder is equal at all points of its periphery, and hence neither the packing nor the cylinder will be unequally worn away by the'reciprocation of the piston, which unequal wear is a serious fault of the old-style one-piece packing-rings.

My invention possesses further advantages, which it is not necessary to explain.

My invention is completely illustrated in I the accompanying drawings, in which- Figure 1 is an elevation of a packing-ring embodying my invention. Fig. 2 is an edge view of the same. Fig. 3 is a sectional view of a part of a-piston-head provided with my packing. Fig. 4 represents the ends of the packing-spring, the adjacent portion of the bull-ring, and a pin projecting from thelatter I between the ends of the spring.

itsspring 5.

wet emery-powder between them while in the cylinder. These processes insure that the said joints between the segments will be 5 steam-tight when the ends of the segments are in contact.

Within the packing-ring is forced a 0- shaped steel spring 5. When free, the diameter of this spring is about one-quarter larger than that of the packing-ring. The ends of said spring are bent outwardly and are inserted in the recesses 3 inthe ends of the packing-segments. The elasticity of said spring not only forces the segments I outwardly againstthe cylinder, but presses them vtogether at their joints 4. Thus a small gap I 6 will be left between the ends of the recessed segments. This gap is placed at the bottom of the cylinder when the bull-ring 7, Figs. 3 I

and 4, is in steam-tight contact with the cylinderI The packing-grooves in the bull-ring are about one-eighth inch deeper than the combined thickness of the packing-ring and In Fig. 3 the packing-rings project from the piston, as the cylinder is not shown.

. sesses the advantages mentioned hereinbefore,

and is inexpensive to construct and reliable in 5 its operation.

Aplurality of nested O-shapedsprings may be substituted for the single spring 5 without departing from the spirit and scope of my invention.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

The combination \Vl'tll a bull-ring, of a packing-ring comprising a plurality of segments, recesses cut in the meeting ends of two of said segments, a C-shaped spring confined Within g T W v said ring, the ends of said spring being bent 1011b B In outwardly into said recesses, and a pm secured \V1tncsses:

to the bull-rmg and pr03ecting between the \V. D. ATKINsON,

.In testimony whereof I ailix my signature in the presence of two witnesses.

ends of said spring, substantially as described. LAURA Bnom: ERG.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2558426 *Jul 22, 1946Jun 26, 1951Guy H HallPiston ring
US4570945 *May 16, 1983Feb 18, 1986Nissan Motor Co., Ltd.Piston ring having shape of an ellipse or an elongated circle
US6450295 *Nov 2, 2001Sep 17, 2002Nsk Ltd.Feed screw device
US7650806Jan 26, 2004Jan 26, 2010Nsk Ltd.Feed screw device
Cooperative ClassificationF16J9/16