USRE254E - Improvement in stuffing-boxes - Google Patents

Description

UNITED STATES PATENT. OFFICE.

. THOMAS XV. ALLEN AND CHARJES W. NOYES, OF (CHE ili'lliSllpNEiV YORK.`

IMPROVEMENT IN STUvFFiNG-BQXES.

Specification forming part of Letters Patent No. 5,357, dated h'ovunherl, 1F47', ltoissne No. 254, dated 4 January 10, 1853i.

-To au whom it may concern:

Be it known that' we, THOMAS XV. ALLEN end CHARLES W. Noyes, of Greenbush, Rens 'elaer county, New York, have invented oertainpnew anduseful Improvements in Metallic Packing for Stuing-Boxes, ot' which the following` is a full, clear, and exact description, refereneebei ng had to the accompanying drawings, making,r part ot' this specification, in Awhich 1 Figure 1 is a vertical section' of a studiegbox on a pistorrrod; Fig. 2, a section ofthe sarnein perspective, with the piston-rod broken to exhibit the packing; and Fig. 3, asection of the packing-cup.

Thek saine letters indicate like parts in all the figures.

The object of our invention is the producl tion oi' a stuiiing or packing box for pistonrods, shafts` 65e., which shall be free to yield laterally to the vibrationsor inequalities of motions of the pistoirrod. sliofts,&o.,without producing leakagein thejoints 'ind to this end the nature ot' our invention consists in iittiutr a metallic enp or ring, through which the pistou-rod or shzil't passes and plays, to the inside of the box, so that the bore ot' the said cup or ring.,r may make a close joint, by packing or otherwise, with the surface of' the piston-rod or shaft, and the end thereof, by end pressure, with the bottom of the box,to' prevent the passage of steam or other iluid, while at the saine time t' i said cup or ring; mayslide laterally in the box, to adapt itself to the vibrations or irregular motions ol'tlie piston-rod,shut"t,orother rod thus packed; and our invention also corr sists in making the inner bore ot' the said cup y conical, in combination with a series of out,-

metallic 1ings,wliose outer peripheries are tittedthereto, so that by forcing the said rings endwise into the conical cup they shall be conv Iraotcd to make a close joint with the surface of the piston or other rod or shaft passing' through them,Whi-le at the saine time t he said end pressure shall force the end o l' the cup into close Contact with the bottom o1' the box, and thus eti etually make the joints tight without preventing the lateral play of the cup in the box to follow the vibrations of the piston-rod or shaft.

'The-'diagrmn annexed hereto as part of this specification represents, on a scale ol' halt its size, the stutlingdiox of a locomotive-engine cylinder, in which this invention has been proved, and exhibits the method of construe tion. The stuffing-box of a cylinder made in the ordinary way is bored out truly, and the annular portion of its bottoni,v between the sides ofthe box and the orilieethrough which the piston plays, is turned .or ground down smoothly and truly at right angles to the axis ofthe pistoirrod. we place a brass or composition ring in the diagram marked a. a, ol', say, a quarter-inoh thick, fitting snugly within the box, but having a play of, say, one-eighth oian inch around the piston-rod. This ring is ground or fitted truly to the annular bottom ot' the hex, and has its upper surface inadetruly parallel with its lower one. On this ring; .we next place a brass or composition cup, which we f ill thc vibrating cup.77 it is externally ac vlinder, one-eighth ol` nn inch less in diameter than the Stntiing-boxs Imre, and, Saly, Alno and a hall' inches long; Internally it is so slm'pcd as to receive, in addition to the piston-rod, as its matrix or hed, t-lnmetallic packing hereinafterdcscril'ied,conformingl and fittingI` t o itI truly, as shown at l) l). its lowersnrl'nre is also l ruly tilted to the rin.;l u, u.

lhe wicking', which inny he nnnle ol' ln'uss or composition metal or lnblaitl niclnl, which last wc use :unl prcl'cr. eens-ists ol' several rings (welnrvc used iirevfithnllA :in inch thiolt each) ground trnliv lo enel: other, tilting' ne curately ith their internal rdn-rs the piston rod, and haring'` when laidone on the other in their pince in tinl cup ,inst described, ex

ternally the simpe ol' a irnstuin ol' :in inverted- Cone whose tippt-r or -renter dinnnfl'er is onceighth ol` :nl inch less than that ol'thc bore ot' the sluilingdwx, :rnd its` lower-:1nd lesser rlianletcr equal to the thickness olthe piston-rod, as presented by o c ce e. These rings are enter divided in oneor more places, as convenience and experience muy direct,

Itaking ont sufficient inetnl at the cuttings to allow n contraction ot' the eli-cle ol' the rings as the wenr ot`l their internal surl'nee against the pistoirrod causes their parts to approach the centers ot' their circles. On the top of these conical rings we place another brass or Upon this` annular bottoni form convenient for the purpose of keeping a y suitable pressure upon said ring, the effect of which will be to depress the packing into the conical-shaped chamber of the vibrating cup,

j and thereby thrust the packing inward, so as to embrace snugly the piston-rod, and effectually prevent the escape of steam or ingress of air along thc rod, while the accuracy of the fitting of theontside of the packing to t-he cup and of the rings to each other andto the bottom of the stuffing-box will prevent escape of steam or entrance of ai rin any other direction. v

The cap of the stuffing-box is formed in the usual way, leaving a suicient/spa'ce between its lower surface and' the upper ring for the introduction of the springs. i

For the purpose of conveniently regulating the pressure ofthe springs upon the packing, We use, inv addition to the nuts employed to screw down thel said cap` a set of nuts underneath the cap, so as to hohl it exactly in any.

vinglyingin an unyielding matrix or bed would force it up obliquely to the line of the axis of the piston, aud soon wear into irregularities the surfaces of impact of the rings on each other, and also on the'piston.

XVe do not limit the proportions of the parts to those stated above, but vary them, so as to suit the case ofV different engines and differ- 5 ent service; nor lo we ilx the angle made by the outer surface of the packing-rings and the axis of the piston at the degree of inclination described in this specification, (by way of illustratiom) but Vary it as may bev found in practice best suited to eifect the proper degree of pressure against the piston-rod by the packing. i

We do not think it necessary to describe the various methods that may be used to keep the packing and the rings from revolfying when the stuffing-box is used with rotatiuggfshafts, as any intelligent mechanic can adapt-a variet'y of simple iixtures to effect that end.

It will be obvious from the foregoing that the first part of our invention may be cml ployed without the second by iitting or packing the cup onto the piston-rod or shaft so as to make a close joint therewith by means other than the conical rings, and still retain the advantage's due to the lateral play of the cup in the box.

What we claim as our invention, and dcsire to secure by Letters Patent, consists inl.- Gombining with a stationary stuffing or packing vbov acup or ring or its equivalent, through which the pistoi'rrod or shaft passes and works,so fitted,substantially as described, that the end thereof shall make a close joint by means of end prcssureat the bottom of the stufting or packing box, and be fre:A to slide thereon laterally to follow the vibrations/of Ythe piston rod or shaft, as `set forth.

2. Making the inner bore of the cup coni-v Cal, in combination with the out metallic rings fitted thereto substantially as described, so that by the-application of end pressure the out rings shall be forced into close. Contact with the periphery ofthe piston rod'or shaft, and the end of the cup into close contact with the bottom of thc box, as described, and thus effeetuall y p reventthe escape of steam or other huid, and at the same time permit the rcqnired lateral play, as set forth.

,EHOS. \V. ALLEN. UNAH. \V. NOYES.

\Vitnesscs:

l). G. lxNcnoi-"r, S. (l. Summum.

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