US884318A - Stuffing-box. - Google Patents

Description

No. 884,318. PATENTED APR. 7, 1908. F. A. DAILEY & B. LONG. STUFFING BOX.

APPLICATION FILED APR. 29, 1907.

' 2 SHEBTSSHEET l.

[CF f6 f? [4 j? Y f if I WW4 [MW 700% FMA. fizz 2Z6 wwlaw PATENTED APR. 7, 1908. F. A. DAILEY & B. LONG.

STUFFING BOX APPLICATION FILED APR.29, 1907.

2 SHEETS-SHEET 2.

NITED STATES PATENT OFFICE.

FRED A. DAILEY, OF ST. PAUL, AND BARNEYLONG, OF MINNEAPOLIS, MINNESOTA. r

sTU'FFme-Box.

No. 884,3 1s.

Specification of Letters Patent.

Patented A rnv, 1908.

Application flled April 29, 1907. Serial No. 370,917.

To all whom it may concern:

Be it known that we, FRED A; DAILEY and BARNEY LONG, citizens of the United States, residing, respectively, at St. Paul, in the county of Ramsey and State of Minnesota, and Minnea olis, in the county of Hennepin and State 0 Minnesota, have invented certain new and useful Improvements in Stufling-Boxes, of which the following is a specification. I v

Our invention relates to improvements in stufiing boxes, its objects being to rovide a stufiin box which may be packe and "reacke with lastic acking without removlng theglan which has a communicating chamber in which a reserve sup 1y of packing may be stored and held unc er pressure, and from which the packing may be forced into the stufling box proper as needed; and which has means for lndicating the pressure 11%011 the packingand the amount of packing W ich has been fed from the chamber to the stufling box.

With these objects in view our invention consists in the construction, combination and arrangement of parts hereinafter described and claimed.

In t e accom anying drawings, in whichis shown the pre erred form of our invention, Figure 1 is an end view of a stufling box embodying our improvements; Fig. 2 is a vertical section through the same on line :c-ac of Fig. 1; Fig. 3 is a cross section through the 1 storage chamber on line z2 of Fig. 2; Fig.

4 is a vertical section through the storage chamber on line x''x of Fig. l on an-enlarged scale; Figs. 5 and 6 are front and side views, respectively, of the cooperating members comprising one of the throat rings; Figs. 7 and Sare side andfront views, respectively, of the follower for the back throat ring; Fig. 9 is a vertical section partly broken away on line y. y of Fig. 2; and Fig. 10 is a ipiers ective view of the inner end of the stu ng ox casing, the casing being shown partly broken away.

In the drawin s A re resents so much of the cylinder hea and so much of the piston rod, of an ordinary reciprocating engine as is necessary to show the application of our invention to a stufling box adapted for use with such-mechanism.

The cylinder head is counterbored in the usual manner to receive the casing 2 of the stufiing box, and the annular she 3 of the cone member, which telescopes over the open against it.

the stuffing box casing isbeveled at the same angle as the cone so as to secure a sliding fit Arranged against the rear end of the cone is the rear throat ring 5 formed of two cooperating halves as illustrated in Figs. 5 and 6. These ring members are arranged with overlapping ends, and are beveled at the same taper as the rear portion of the cone 4 in order to secure a sliding fit against the cone. They are held normally pressed against the cone by means of a coil spring 7 interposed between the shoulder 8 of the cylinder head and the follower ring 9 which abuts against the throat ring. 1

The rear end of the stuffing box casin is reduced in diameter, and formed with sTits 10, as shown in Fig. 10, in order that it may be slightly sprung in when in forced engagement with t e cone. To prevent the acking from being squeezed rough the s its a similarly slitted sheet lining 11 is arranged within the casing in such manner that its slits'will not register with the slits in the casing. The stufiin' box is formed exteriorly with an annular ange 12, and is'detachably secured to the cylinder head by means of an annular land 13 which forms a steam tight joint with the flange 12. The gland may be secured to the cylinder head by studs'14, and a steam ti ht joint is secured between the gland and t e cylinder head by arranging between them a gasket 15.

The stuffing box is formed at its forward end with an inwardly rojecting shoulder 16 the front ring 18. This ring is in two halves and is slipped inside the stuffing box from the rear end, and held up against the shoulder 16 by means of a ring nut 19. The inner or rear end of the split ring 18 is beveled off to form a sliding joint with the o positely' beveled front throat ring 20, whic is constructed in two halves snnilar to the back throat ring already described. The s ace about the iston rod betweenthe' throat rings is intended to be filled with plastic packing, not shown. I i

Near its forward or outer end, the stufiing box casing is formed or provided with a tuto form an abutment or the shoulder 17 of I pare I of any Suitable plastic packing. This chamber communicates with the stufiing box, and its side wall orwalls 21 are preferablyintegral with the stufiing box, as shown. Working within the chamber is a screw operated ram'or plunger, which in the preferred form shown in the drawings is in the shape of a piston 22 having a rod or stem 23 which asses slidingly through'the head 24 of a eed-nut 25, and has at its outer end a head or stop-nut 26 to limit its inward movement into the chamber. The feed-nut 25 is preferably arranged on the exterior of the chamber, as shown in the drawings, and has screwthreaded engagement, as at 27, with the chamber-wall 21. The feed-nut may be provided interiorly with a tube or bushing 28 immediately surrounding the piston-rod and centrally secured in the nut-head 24 by pins 29. The iston is held normally pressed in towards t e stufling box by means-of a coil spring 30 interposed between the piston and t e feed-nut. The, spring is preferably of such length and strength as to hold the .pis-

ton normally thrust into the chamber far enough to bring the stop-nut 26 against the to of the feed-nut 25, as shown in Fig. 2. lhe feed-nut 25, when itis arranged exteriorly of the chamber-wall 21 as shown in the drawings, may be held from working back from any in-screwed position by means of a spring 31 secured to the stufiing box casing and adapted to spring into recesses 32 in an annular lug 33 upon the feed-nut 25.

To apply the packing the feed-nut 25 is first unscrewed and withdrawn from the chamber, carrying with it its connected plunger parts. A sufficient amount of preplastic acking is then inserted into the chamber, and the piston and feed-nut are replaced. The feed nut is then screwed down until enough of the packing has been forced into the stuffing box pro or to fill it and leave the chamber partially ed. The resistance of the packing will force the piston against the spring pressure of its spring 30, and cause the outer end of the piston rod to be thrust out beyond the head of the feed-nut, as illustrated in Fig. 4.- In this position the piston will exert a constant elast1c pressure against the packing, and as the packing in the stuffin'g box wears down, the packing .in the chamber will be forced in to take its lace,

and the plunger will gradually move own, under the pressure of its spring 30, until the 'stop-nut 26 at the end of the piston rod engages the top of the feed-nut, as shown in Fig. 2. By then screwing the feed nut further down the pressure of the iston u on the packing will be renewed, an the on of the piston rod will again be thrust out throu h thetop of the feed-nut into the position s own inFig. 4. The stop-nut 26, or rather the outer end of the piston rod, will thus be a telltale to indicate Whether or not pressure is being exerted upon the packing,

and the position of the iston rod together with the extent to whic the feed-nut has been screwed down will indicate the amount of packing which has passed into the stora e chamber. In this way a constant tab can e kept both upon the supply of packing and the pressure to which it is subjected.

By the mechanism described the acking in the chamber and stuffing box can e kept constantly under elastic pressure, the de me of pressure can be varied, andthe stu g box and chamber can be filled and refilled without removing the gland. If desired, the tube or bushing 28 may be made of considerable length, so as to form a solid abutment for the piston when the spring has been partially compressed, and cause the piston to exert thereafter a positive, unyielding, pressure against the acking.

While, for the purpose of illustration, we have shown our improvements applied to the piston rod. stuffing box of an ordinary reciprocating engine, it will be understood that they may be equally well applied to stufiing boxes of any suitable construction, and for use with any desired mechanism; and the details of the device may be modified in various Ways without de arting from the principle of the invention, t e scope of which is defined in the claims.

We claim as our invention 1. The combination, witha stufiin box, of a chamber communicating with t e interior of the box and extending outwardly therefrom, said chamber being adapted to hold a reserve su ply of plastic packing, and a screw operate ram working within the chamber, and adapted, when screwed in, to force a supply of the stored packin from the storage chamber into the stuffing ox.

2. The combination, with a stufiing box, of a packing chamber communicating therewith, a feed-nut having screw engagement with the chamber wall, a plunger working within the chamber and having sliding support in the feed-nut, and a spring interposed etween the plunger and the feed-nut.

3. The combination, with a stuffing box, of a packing'chamber communicating therewith, a feed-nut having screw engagement with the chamber wall, a lunger working within the chamber and having a rod extend ing slidably through the top of the feed-nut, a stop-nut upon the end of the rod, and a spring interposed between the plunger and t e feed-nut.

In testimony whereof we afiix our signa tures in presence of two witnesses.

FRED A. DAILEY. BARNEY LONG.

Witnesses:

ARTHUR P. LOTHROP, HENRY B. BLAKE.

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