US1557945A - Rod packing - Google Patents

Description

Oct. zo, 192s'. 1,557,945A

(LA. SCHLOTTER ET AL ROD PACKING Filed May 10, 1922 Patented Oct. 20, 1925.

AiJlSul'ixE*i) STATES CHARLES A. soIIIioTTER, OPl AVALON, AND IvII'LOTQsOHOLL, OP PITTSBURGH, P-ENN- l PATENT OFFICE( sYLvANIA, 'AssIGNORs ln'Y `MnsNn ASSIGNMENTS,v To PLEXOMET CORPORATION, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

ROD PACKING.

Application filed May 10, 1922. Serial iNo. 559,866.1;

To all 1071.077@ t may concer/n.:

Be 1t known that we, CHARLES A. SoHLor- 'rnn and MILO T. SoHoLL,1citiZens of thev United States, residing at Avalon and Pittsburgh, respectively, in the,l county of Alle gheny and State of Pennsylvania, have .1nA vented new and useful Improvements inRod I ,Packings, of which the following is a specication. p y v .Our invention relates to packings for piston-rods, valve-stems andv the like, and its` object is to provide composite packing-rings which will ensure fluid-tight joints under all conditions.` This and other objects will be made clear in the'following description of our invention. l y

Referring to the accompanying drawing, Fig. 1 is a central longitudinal section of `a stufling-box embodying our invention, ,the rod 2 being in side elevation; fFig. 2, a plan view of one of our improved packingfrings; andFig. 3, perspective view of a modified form of our packing.Y ring. lFig. 4 is a development of a portion of a modified formi of ,our invention showing the metal ring with diagonal slots.

On the drawing, 1 designates a stuiiingboxcasing containing the reciprocable rod 2, surrounded by the packing -rings 3, `the gland 4,v and the cap 5,'-the latter being threaded to screw on the casing.k `The bottom of the casing preferably fits the rod 2 closely. Above this closely-fitting portion of the stuiiing-box casing is an annular -chamber 6 having its bottom wall preferably tapered downwardly toward the rod 2 to form a shoulder or seat 7 for the lowest packing ring 3. Preferably a plurality of packing rings are superimposed On the seat 7 in the chamber 6, on the uppermost of which rings is seated the resilient glandor follower 4, preferably having its inner or lower end beveled upwardly and toward the rod 2. The inner face of the cap 5 engages the top of the gland and, as it is screwed down, causes the gland to compress the packing-rings in the chamber 6, which is bounded by the inner wall of the stuiling-box, the rod, the shoulder or seat 7 and the gland.

The packing-rings are composite and are each composed preferably of a ring 8 of Agraphited asbestos having its inner walll seated in an outwardly-facing annular channel in a metal ring 9 which bears directly on the rod 2. Each ring is divided or cut entirely across diagonally at least at onev place as shown atvlO in Figs. land 3. Be-

fore assemblingthe rings 8 and 9,*the flanges 12 `.of the ring 9 are preferably at right angles to the intermediate portion 13 thereof.

rlhe divided flexible ringS can befeasily inserted` in the ychannel formed by the flanges 12 and the portion 13. The yassembled'rings 8 and 9, Of'which the ring 8 may be made of material square in` cross-section, is placed Y in a press having its opposing pressing faces constructed to depress the flanges 12 into the sides of the ring 8, in order that the flanges may form with the portion 13 a locking groove to .retain thewringsv in their assembly. vWe have shown ithe ring 8 having substantially a, rectangular cross-section, :but its periphery may be lnarrowed or wldcned` with good results. The iianges 12 may occupy greater or smaller Iportions ofthering 9 than shown. *Y l y The inner or annular portion 13 vof the ring 9 has an annular groove 14 facing the rodv2 and lying centrally of the portion 13. The ring 9 may bie composedv of any suitable iexible anti-friction metallic packingv material lpreferably pressedV from a `.sheet-like strip and bent into the shape shown` and described. 'i The groove 14 may be packed` with lubricant. It also tends to trap water of condensation, if any steam escapes along the rod 2, thereby forming a seal. The ring 9 may have a number of holes 15 extending entirely through the portion 13 along the groove 14. These holes permit any oil or grease, with which the ring 8 may be impregnated, to pass into the groove and lubricate the vrod 2. In case the ring 9 is made of rather hard metal the holes will somewhat weaken the portion 13 and allow it to be narrowed more easily under the pressure of the gland.

The screwing down of the cap 5 causes the gland 4 to compress therings 3 between its beveled face 16 and the beveled seat 7. The pressure is irst applied to the rings 8 which tend to spread so as to fill up adjacent vacant spaces and force the rings 9 in close contact with the rod 2. Eventually pressure from the gland applied to the rings 9 in directions parallel with the rod 2 will narrow the portions 13 and make the grooves 14 narrower Aand somewhat deeper. The groove 14 by reason of the uniform thickness of its wall lcauses the portion 13 to take a simple bend vwithout 5 wrinklesy appearing at either side of the groove when a ring is compressed. If the portions 13 were all parallel with the rod 2., it might yield irregularly as it narrows so as toform channels for the escape of Huid at the surface of the rod. Thevgroove by reason of the uniform thickness of its wall ensures that'the rings will maintain a seal with the rod 2. When the rings -9 arranged as in Fig. 1 are compressed sufficiently by the gland 4: the wall ofthe groove bul'gesV outwardly andcompresses the packing ring 8, and the, annular portions of the rings at each side of the groove will move relatively one toward the other without disturbing or breaking their line contacts with the rods.

In F ig. 3, Irshow a-packing ring with'the joint 10 extending entirely acrossone sideY `of the same; and also' with the joint 11 eX- tending through the ring 9 only, though it might extend through the ring 8 also, if desired. The'number of joints 10 and 11 may be as many as desired.

The gland 11 is shown composed of a heli.- cal spring 17 having one end seated in the gland-cap 18. The ringsr 8 are preferably made of fibrous asbestos coated with grapliite, but they may be composed of other sub-V stances, as rope and the like.

On Fig. 4, Ishow the metal ring 9a provided with diagonal slo-ts15a in place ofthe round holes shown in Fig. 3. Preferably the slots have their adjacent ends terminating 'at about a transverse line across the ring.

The slots permit a better distribution of the` metal during the crushing or narrow-ing of the ring due to the action of the gland liability 0f anyV having the channel member nbulging outwardly to AformY an annularwave whereby, when the ring is compressed, itbulges outwardly in a uniform manner' and Ycompresses the packm0' metallic channel member 4oflierible metal substantially uniform thickness, adapted to contact with a movablerod embraced thereby, the channel member being open peripherally, and a ring lof yieldingpacking seated in the channel, the base of the channel member bulging outwardly kto form anannular wave of curved cr0ss-Secf tion whereby, when the ring is'compressed, it fbulges outwardly in a uniform manner and compresses the packing.

3. A packing-ring comprising'an annular Vmetallic channel member of ilexiblemetal having substantially uniform` thickness adapted to contact with a movable rod embraced thereby, the channel member `being open peripherally, and a ring of yielding packing seated in the channel, the base -of the channel member bulging outwardly to form an annular wave andthe portions of -thebase at eac'h side of the said wav-e bulg-V ing inwardly to form annular waveswhere;-y

KSigned at Pittsburgh, Pennsylvania, thisL 8th day of `May 1922.

Y 'CHARLES A. sonLoTTgE.

T. .SGI-TOLL- A packing-ring comprising an annular.

' by, when .the ring is compressed, its base bul-ges outwardly in awuniform manner andv f

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