US1128123A - Packing for piston-rods. - Google Patents

Description

P. W. FRITGHEY. PACKING PoR PIsToN RODS.

C APPLICATION FILED JUNE 9, 1911.

Patented Feb. 9, 1915.

FRANKLIN WM. FRITCHEY, 0F USKY, OHIO.

PACKING- FOItt/PISTOfN-RODS.

iaaaiaa i Application inea June 9, 1911. serial Naeaaaaoa.

To all whom it may concern:

Be it ,known that ll, FRANKLIN WM. FRrrCr-IEY, a citizen4 of the United States, residing at Sandusky,in the county of Erie and State of Ohio, have invented a new and useful Improvement in Packing for Piston- Rods, of which the following is a specification.

My invention relates to certain improve- Specification of Letters Patent.

ments in packing for pump piston rods, lo-

comotive" throttle rods, locomotive, marine,

and stationary engine piston rods, valve.

stems, and for other reciprocating rods, and consists in a combination packing, composed of a soft or fibrous element in conjunction with a metallic or Babbitt ring, the one supplementing the other and serving to overcome the difficulties in satisfactorily packing piston rods, and other reciprocating rods.

Figure 1 is a sectional viewl of my improvement as applied to a locomotive throttle rod stuffing'box. Fig. 2, is a perspective view of one half of one ofthe Babbitt ringsv` as used inthe ordinary stuiling box, as'shown in Figs. l and 3. Fig. 3, a sectional view as applied to a locomotive air pump piston rod stuffing box. Fig. 4 is a perspective view of onehalf of one of the Babbitt rings as used in the arrangement as shown in Figs.

7 and 8 having a more acute angle, or longer taper, on the-one end over which is fitted the follower ring which fin turn is acted lupon by the pressure of the coil spring and steam pressure. Fig. 5, end view of the two parts of my Babbitt rings. Fig. 6, side view.A

of the two parts of same, showing the beveled ends and overlapping joints. ,Fig 7, is a sectional view of my device applied to a locomotive valve stem. FiO. 8,-is a sectional viewof my device appl'ed to alocomotive piston rod.

My invention consists ofv a vmetallic or4 Babbitt metal ring B, and a/ fibrous ring A,

interposed `between it and the outer end of the stuffing box D, and in the construction and arrangement of the parts.

rateiitea reu. a, iaia.

istie piece of metal multiplied appropriately to the demand for its use; and these pieces with a rhomboidal projection and a triangular-recess, and at its other end with a rhomboidal recess and a triangular projection; these projections and recesses be'- 'ing'y formed to provide between each two abutting ends of said members, one pair of faces abutting `in the direction of the axis of the ring, and two pairs of faces abutting lin the direction of its circumference; the circumferential abutments at each end of each member being in two circumferentially offset planes substantially parallel to a radius of the ring'intermediate of said planes, whereby a joint is produced that is overlapped against escape of fluid in the axial direction, and these @abutting faces together equal the entire sectional area of the ring; and each axial abutment being confined within the zoney of the outer cylindrical portion of the ring and being inl a plane that is perpendicular to the planes of the circumferential abutments but inclined to both the radius and axis lof the ring; these axially abutting faces at the respective ends of a single member being also inconstruction vof abutting ends of the ring v segments is productive of a number of advantages. The joints are sealed against direct passage both radially and axially; the segments assemble by true diametric movements instead of by'combined diametric and axial movements, as in ring segments having longitudinal abutment in planes inclined to the oset planes and, therefore, require less room in an axiall direction for the insertiongof the iing, and avoid circumferential spreading tendencyl under axial pressure of the packing gland or follower. ln the preferred construction, the segments have the further characteristics of being not merely symmetrical, but identical in form, so that two segments made in the same mold will iit together when presented to each other in reversed positions, thus not only simplifying manufacture, but avoiding the inconvenience and expense of keeping two kinds of ringsegments.

As will be seen from theV drawing, the ring embodies an intermediate cylindrical portion and conical end portions. The joint j on the other side, so that there can be no relative axial displacement between the segments. The inclined axial abutting planes, while substantially perpendicular to the offset clrcuinferential abutting planes, may, if desired, be slightly undercut to produce a slight interlock, though not suiciently. undercut to defeat the advantage of having them essentially perpendicular to said oiset planes.

The metallic ring* is made in two parts as shownin Figs. 9., 4, 5, and 6, with overlapping lips K, K, L, L, and is of cone shape on each ofits ends, the cone or bevel being jmade to such angle as will suit the condij tionsto be met in actual use. For use with Y and t0 Provide means for takin /ring are made, ordinarily,

the ordinary stuffing box type, and where access to the adjustments of the gland can be had, the angle or bevel is made 45 degrees at both ends.

motive piston and valve stem, which depend upon the pressure of steam and a coil spring for adjustment, the angle of the bevel on the pressure end is'ordinarily 67 degrees, the opposite end retaining the ordinary 45 degree angle, the 67 degree angle giving more bearing surface for the steam, and the follower ring hugs the longer angle better than that of 45 degrees. j u

My .Babbltt ring is made with overlapplnglipsr at the joint, as shown in Figs. 2, 4, 5, and 6, to prevent the escape lofl steam, up wear of `the ring. The overlapping lips of the at ,the same angle as that ofthe beveled ends, and as pressure is exerted against the outside bevel ends these angles all tend to close the rin to the rod, and at the same time the la joints are kept pressure tight. The end ofp my fibrous 'ring that rests against the end of the cup, 1s made to conform to the inside end of the pup, while the end next to the Babbitt ring is' fimnel shaped to fit snugly against the For use with the loco-'i `or fitting of any sort, the Babbitt ring emaiaaias l bevel en d of this ring. The angular bearing of these two rings, the one against and partially within the other, tends to force or wedge the brous ring out to lit the bore of the cup making the cup pressure tight, and

.at the same time forces the Babbitt ring tight against the rod to prevent leakage.

Should the` Babbitt ring, with long usage, wear -loose up on the rod, the two parts can be taken out and the ends of the overlap ing lips be led off a little, when they will 't as before. The overlap joint lips are so constructeda that the contact faces are on about the same angle as the outer bevel, and between the beveled ends is the ring proper, that ts loosely against the walls of the vibrating cup., The split between'the two halves of the metallic ring extends, on one side, longitudinally, through the beveled end and across the annular part, thence at right angles between the edge of this and the other beveled end and thence at right angles out through the other beveled part. This latter beveled end, in practice, is placed against the fibrous packing, so that the s lits of the overlap joints of both halves o the ring, embed in the fibrous packing, become pressure tight,and prevent'l the leakage at the overlap joints.

The objections to the use of fibrous ackingsv solely, are that. the wear is rapi the packing is short lived and becomes expensive, and the trouble of repacking troublesome. With the use of metallic packing, alone, it is necessary to fit the same accurately to wedge shaped cups to insure to some degree against a non-leaking condition, both at the rod-fit and over the outside of the packing. This -is also an expensive and troublesome acking, as it wears and tends to lose its eflibiency as a pressure tight fit, and its outer accurate fit to the cup, especially in air piunp piston rod stuiin boxes, where it requires special fixtures an the dissembling of the pump to apply or change the same.

In my arrangements the metallic rings can be molded and used without machining bedding itself in the fibrous ring, the tter adjusting itself to any irregularities in the surface of the ring.

In the ordinary stuiing box, as in the air pump, the Babbitt ring can be ap lied with a fibrous ring on each side or end, and the gland be forced against this packing'V with just enough pressure to stop leakage, and as only a slight pressure is'required, no excessive wear to the Babbitt ring will be experienced.

In the locomotive throttle rod stuiiin box I sometimes use an extra brass ring although this is not essential, the fibrous packing being used at both ends of the Babbitt ring, the brass follower ring having a tapered bore to t the longer taper., of thev .Babbitt ring, on the pressure side.

What I claim is:

1. A ring for rod packings; said ring having its interior surface cylindrical and` 'its exterior surface formed with conical ends and a cylindrical intermediate portion; saidA planes substantially parallel to radii of the ring and corresponding in area to the transverse section of the ring, and each axial abutment confined within the outer cylindrical zone of the ring, and being in a lane substantially perpendicular to the ad- ]acent offset planes, but inclined to the axis of the ring; said inclined axial abutment planes being at the same inclination to the axis as the respective conical ends of the ring. i' l 2. A metal packing ring having a cylindrical inner surface and an outer surface that is conical at the ends and cylindrical between the ends; said ring comprising two geometrically identical semi-annular members, each constructed at one end with a rhomboidal projection and a triangular recess, and at its opposite'end with a rhomboidal recess and triangular projection; said projections and recesses providing between each two abutting ends of said members, one pair of-fa'ces abutting in the direction of the rings axis, and two pairs of faces abutting in the direction of its cir- -curnference; the circumferential abutment- FRANKLlN- WM. FRITCHEY.

Witnesses:

GEO. W. FERGUSON, GEO. D. BLADE.

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