USRE12806E - Packing fob piston-rods - Google Patents

Description

o 12,806. REISSUED JUNE 2, 1908. A. 0'. SOHAEPER.

PACKING FOR PISTON RODS.

APPLICATION FILED MAR.1 6. 1908.

2 SHEETS-SHEET l.

Ava/5r 4150M 5/? WWW No. 12,806. REISSUED JUNE 2, 1908.

A. 0. SGHAEPER. v

PAGKING FOR PISTON RODS.

, APPLICATION FILED MAR.16,1908.

2 SHEETS-$111131 2.

I pvuavray wr/lafissis 06057" CIJZ/EFE/P UNITED STATES PATENT OFFICE.

AUGUST 0. SGHAEFER, OF OELWEIN, Iowa, 'ASSIGNOR or ONE-HALF To WALTER r. CHRYSLER, or OELWEIN, IOWA.

PACKING FOR PISTON-RODS.

Specification of Reissued Letters Patent.

Reissued June 2, 1908.

Original No. 871,068, dated November-.12, 1907, Serial No. 360,063. Application for reissue ma Kan-.1116, 190a.

' Serial No. 421,593,

To all whom it may concern:

Be it known that I, AUGUST 0. SCHAEFER, a citizen of the United States, residing at Oelwein, in the county of Fayette and State of Iowa, have invented new and useful Improvements in Packing for Piston-Rods, of which the following is a specification.

M invention relates to a packing desi ned particularly .for piston rods but capable of use in other ways. I

The object of the invention is to provide a acking of simple constructionand one that is very effective in action and operates with but little friction.

A further object is to provide a packing having means to compensate for Wear.

In a broad sense the invention consists in an inner and outer series of segmental elements, the elements of each series having inner faces'forming a cylindrical bearing surface for a rod or a shaft, the inner series being inclosed by the outer one or fitting within pockets provided in said outer series. The packing 1S cone-shaped and the elements of the inner and outer series are so arranged with respect to one another that each element of one series laps by or covers a joint between a pair of elements of the other serles.

Further, the invention consists more specificall in an inner series of packing elements llavin outer curved faces and an outer series of pac ing elements having curved recesses or pockets to receive the elements of the inner series.

Further, the invention consists in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accom anying drawings forming part of this speci 'cation: Figure 1 is a longitudinal central sectional elevation of a portion of a cylinder, portion of a piston rod, and a packin involving my invention. Fi 2 is t a vertica section on theline 22 of reducing bushing.

i 1, looking toward the left in said Fig. 1. Q l igs. 3 to 6' arepers ective views, Fig. 3 being a follower cone, the packing proper se arated, and Fig. 6 the ig, 7 is an insideface view of one! of the segments of said packing proper. Fig.8 is a cross section on the line igs. 4 and the segments of I 8-8 of Fig. 7. Fig. is a view corresponding to Fig. 7 of one of the small segments of Fig. 10 isa side elevation of one 0 said small segments.

is a cross section on the line 1111 ofFlg. 9.

Fig. 12 is a detail view of a modified form of packing roper.

Like characters refer to like parts throughout the several figures.

The device includes in its make-up aacking pro er which, for convenience, I will ereafter re er to simply as the packing, and this I prefer to make of cone-form in a plurality of inner and outer segments. All 0 these segments may be of some soft composition metal, orthe inner series of them may be of some harder metal such as brass, cast iron or the like. In.Fig. 1 in thedrawings I have shown in part a steam engine cylinder which will be designated by 2. In fact, in this particular figure I have shown but a ortion of one of the heads of said cylinder, t e iston not appearing. Through the head 0 saidcylinder 2 is movable the piston rod 3 which extends outward throu h a boss as 5 on the said cylinder head and which has an annular'external flange as 6 into which aretapped several bolts or screws as 7. I may-employ but two ofthese bolts or screws asshown in both Figs. 1 and 2. Thesebolts or screws 7 serve as ameans for associating the gland 8 with the boss 5, they projecting through op osite lugs or ears on the gland, as shown 0 early in Fig. 2. with nuts 9 at their outer ends, which, when turned home, hold the cup-like gland on the two screws. As usual, the rod 3 moves through a perforation o'r hole in the gland.

I may provide within'the gland 8 a vibrating cup 10. The inner edge of said gland 8 is jammed solidly against the outer face of the boss 5 by the nuts 9. Preferably I lace a packing 11 between the said gland am the boss 5, and this acking may be seated in an annular channe in the inner end of said gland. In this way I revent leakage when The screws or bolts are provided manner the piston rod 3 whichsaid packing I cylinder 2.

u p wear in the packin caused by the action 12 surrounds. Th segments of 'said pack-l ing 12 are so related that, when they are 0 erativey assembled, they present interior y cylin cal m tiee c me hat is ul r in cross section, as shown in Fig. 2 to conform to the cross sect'onal shape of the rod 3. Ext rnally. ai aching 12' i .otonical form, the reducer 0 small end facing the The said acking 12.n1ay be p se of a y esimb c mes: of se ns for example, four, as shown in Figs, 4 and 15, or six, as indicated in 12 T i The acking 12 shown 1n Figs. 4 and 5 consists 0; two large outer segmental elements of duplicate construction, each designated by '13 the ends of which se' ments are illustrated as squared "off, any two inner or smaller segments of similar construction each designated'by 14 and all of them as will be understood,taper externally from their outermost faces. The outer series of se ments have recesses 15 with curved was --c0rresponding substantially to the section of a sphcreand each of the smaller segments 14 fits at its outer ends in two op osite recesses 15 so that the inner faces of t 'e several seg-, ments are brought into coincidence and present in effect a continuous circular wall surrounding the rod 3. The outer series of segments inclose the inner ones and the segments of the two series'interlock and revent relative rotary movement, and the e ements of each series overlap adjacent elements of the other series. Thesmallerl segments 14 are 'so'fittedin the recesses 15 as to leave clearancespace between the opposite ends of the larger or outcrsegments 13, as clearly shown 1n Fig. 2, thereby to provide for taking he iston rod 3. he series of inner segmenta elements fitting within recesses in the outer segmental elements have their faces at the end of the packing in the same lane or flush with the corres onding faces of t e'outer series, so that the at faces ofvboth sections will bear] evenly against the face of the re} ducing bushing as will hereinafter appear.

The pockets or recesses in the outer series of se mental elements decrease in depth m- P war y and the inner series. of segmentalelements are tapered to fit within these pockets. The packing thus provided, when combined with-a suitable cup and seat is capable of both radial and longitudinal movement to take up wear, the several se ments fitting snugl upon each other and al 'oints being close t is to be noted also t at the segments of the outer and inner series are so arranged with respect to one another that each so ment of a series laps by and covers the vents the shifting) j omt between a pair of segments of the other series, thus forming a series of interlocking ,inner and outer segments to compose the cone-shaped packing.

The packi g 12 s preferably fitted in a follower cone as 16 shown in its operative relation in Fig. 1, and this follower cone 16, as illustrated in Fi 3, I generally make insections, although t, is is not essential. The character of thefollower cone depends on the nature-of the ist l (l. Although the packing cone 12 iii; within the follower cone only the external conical faces of the outer segments 13 of said packing cone come into con-j tact the conical inner face of the follower @116, as shown clearly in said Fig. 1. outermost surface of the packingeone l2is adapted to abut against the head of the reduclng bushin 17, the shank of said bushing surrounding t e rod'3 and fitting a perfora- The tion in the'bottom 0f the vibrating cup 10.

All the outer faces of the segments 13 and 14 are in a common plane so as to present practically a continuous surface which follows the shape of the adjacentfaceof the head of said reducing bush ng 17 and contacts evenly therewith.

I prefer to dispose within the boss or hub j 5 a push sprin as 18 bearing at its inner end against the cy inder 2 and at its outer end against the follower cone 16, and the latter may, as shown in Fi 1, have a groove or channel to receive tie outermost whirl or terminal portion of the coiled spring 18. U on the "introduction of pressure into the cy inder 2, such pressure acts againstthe follower cone .16 so as to thrust the same to the right in Fig. 1, said coneacting against the divided cone packing 12 and forcing the same solidly against the bushing 17 and at the same time constricting said packing 12 about the rod 3 so as to effectively prevent the passage of steam between saidpacking .12 and r0 3. On the exhaust of the cylinder, when the pressure is relieved from the follower cone 16 and naturally from the packing 12, the latter may expand to thereby release the rod 3 and permit lts free movement when exhaust is taking place. The spring 18 preof the packing when the pressure is oil. uring the operation of the piston under the action of the steam, the packing 12 is properly closed and tightly seated upon the rod, and I compensate for wear between therod and packing and between the packing and follower cone. I ma make the angle of the packing cone of small extent or pitch, so as to produce thin pliable portions, or feather, or knife edges at the lnner ends of the segments of said cone .packing, which close effectively upon the rod under pressure and promptly re case said rod durin exhaust. By virtue also of this feature t lere is no possibilityof the cone packing wedging in the follower cone. I need provide also but asmall bearing of the packing 13 a on the rod,-and the cone end of the conical packing faces the cylinder, thereby cutting off leaka c more easily. When pressure is applied, t e cone divides the force of the pressure between the inner face of the gland 8 and the rod 3, The outer face of the packing, as previously stated, is shaped to conform to the inner face of the head of the bushing 17, and this shape may be plain or curved. I

The packing is simple in construction, can be inexpensively made, and prevents leak e.

In some cases, and as shown in Fig. 12, t e divided cone packing may consist of more than four segments. In this figure I have shown said cone packing as consisting of three large segments 13 and three small segments 14, andone of these segments, for example one of the inner segments 14, may be made of hard metal, such as brass or cast iron. I have mentioned one of several modi fications of which the device is capable.

I claim as my invention:

1.-A piston rod packing comprising at least two small segments and at least two large segments, the larger segments having pockets or recesses therein. of uniform curvature or conforming to the section of a sphere, and the smaller segments fitting in said recesses, the packing presenting interiorly a substantially continuous'wal-l, and being exteriorly of cone form.

2. A piston rod packing comprising at least two small segment-s and at least two large segments, the larger segments having recesses to receive the smaller segments, and the ends of the larger segments being squared off and separated from each other to provide 7 clearance spaces, the outer faces of both the inner and outer segments being tapered, and the segments mating to present internally a substantially continuous wall and being externally of conical form.

3. The combination, of a cylinder, a piston rod extending through said cylinder, 8. divided conical packing around said rod, the reduced end of the packing facing the cylinder, said packing being composed of inner and outer segemnts which have tapering meeting faces, fixed means against which the packing abuts when under the operation of steam ressure, and a follower cone between the cy lnder and packing to receive thelatter.

4. The combination, of a cylinder a piston rod extending through thesaid cylinder, a divided conical packing around the said rod, the reduced end of the packing facing the cylinder, said packing being composed of inner and outer segments which have tapering meeting faces, fixed means against which the packing abuts when under the operation of steam pressure, a follower cone between the cylinder and packing to receive the latter, and a-spring to act against the follower cone to prevent shifting of the packing when the pressure is off.

5. The combination, of a cylinder, a piston rodproje'cting through the head .of the cylinder, adivided conical packing surround ing the rod, a follower cone to receive said packing, and a vibrating cup provided with a bushing surrounding the rod and against which said packing abuts.

6. The combination, of a cylinder, a piston rod projecting through the head of the cylinder, a divided conical packing surrounding the rod, a follower cone to receive said packing, a vibrating cup provided with a bushing surrounding the rod and against which said packing abuts, a coiled push spring surrounding the rod and acting against the cylinder and follower cone respectively, and a gland inclosing the vibrating cup and held to the cylinder in a steam-tight manner.

7. A metallic packing comprising an inner series of segmental elements and an outer se ries of similar elements inclosing said first series, the outer-face of the packing being conical and the meeting faces of the inner and outer segments tapered, whereby the fluid pressure thereon causes the relative constriction of said inclosed and inclosing elements, substantially as described.

8. A metallic packing comprising an outer and an inner series of segmental elements,

the elements of each series lapping by the joints between a pair of adjacent elements of the other series, and the meeting faces of the outer and inner series being tapered.

9. A metallic packing comprising an outer series of segmental elements and an inner series of segmental elements inclosed by said outer series, outer surfaces of the inner series having an interlocking engagement with inner surfaces of the outer series, substantially as described.

10. A metallic packing comprising an outer series of segmental elements, an inner series inclosed-by said outer series, outer surfaces of the inner series having an interlocking engagement with inner surfaces of the outer series, and the outer faces of said outer and inner elements at one end of the packing being in substantially the same plane or flush with one another, whereby said elements will bear evenly on a contacting surface.

11. A metallic packing comprisin an outer and an inner series of segmenta elements, the outer series of elements having recesses formed therein to receivecthe inner terlocking with the inner faces of the outer depth, and alurality of inner segmental secseries to prevent relative rotary movement, tions each. a apted to'fit wlthln recesses of the elements of each series overlap ing adadjacent outer sectlons, then inner faces Y jacent elements of the otherseries, t e outer being curved to sections of a. cylinder. 15 5 face ofthe packing being conical. In witness whereof, I have hereunto set l13LlA pifston rod packinlg comprising a my handthis 13th day of March, 1908. I p ura it o outerse menta sections whose p outer fazes conform sections of a. cone and 1. j AUGUST SCHAEFER" whose inner faces are curved to sections of a In presence of 10 cylinder and having recesses extending in i S. L; JOHNSON,

wardly from their edges and decreasing in T. L. WHEELER.

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