US1473451A - Rod packing - Google Patents

Description

Nov. e, 1923.

c. T. wAL-TERs ROD PACKING Filed-sept. 25. 1919. 177%] J 27145151535.

Patented Nov. 6, 1923.

CHARLES T. WALTERS, 0F ST. PAUL, MINNESOTA.

RQD PACKING.

Application led September 25, 1919. Serial No. 326,359.

To all whom z't may concern.'

Be it known that I, CHARLES T. WAI/raus, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Rod Packings, of which the followin is a specification.

This invention re ates to metallic packing devices for piston rods and the like, and more particularly to that type of packing devices used on reciprocatory rods wherein it is difficult to keep the rod inalignment withthe gland in the stuffing box, such as the piston rod of a. locomotive which constantly vibrates laterally owing to the wear of the piston in the bore of the cylinder.

An object of the invention is to provide metallic packing' means which may be uickly and conveniently replaced and which is adapted to utilize the steam pressure in the cylinder to assist in pressing the metallic packing against the piston rod as an addi tional safe guard against leakage.

A still further object of the invention is to provide improved metallic packing means -so constructed as to be capable of being preliminarily assembled on the rod and then bodily projected into the stuffing box chamber of the cylinder head.

A still further object of this invention is to provide an improved rod packing construction whereby a permanent and effective steam tight joint may be maintained under all conditions regardless of lateral vibration on the rod and at the same time pro-.

vide at a point outside of the metallic packing, lubricating means surrounding the rod to further assist in sealing the joint against leakage.

To this end the invention consists in the construction, combination and arrangement of parts hereinafter described and claimed.

In the accompanying drawings forming part of this specification;

Figure 1 is a. vertical longitudinal section through the stuiiing box of a cylinder head showing the invention applied thereto.

Figure 2 is'a perspective view of the invention.

Figure 3 is a side view of the same showing the parts partly disassembled.

Figure 4 is a sectional view on line 4-4 of Figure 3, and

Figure 5 is a front view of the metallic packing ring.

In the drawings, A represents a `cylinder head formed centrally withan outwardly projecting stuffing box member B. the bore or stuiiing box chamber C thereof being of uniform diameter.

Concentric with the stuffing box chamber is the bore D adapted to loosely receive the piston rod E, the bore being sufiiciently large to permit the piston 'iod'to vibrate 'preferably exteriorly rectangular in contour and having two parallel faces 2 and 3, the latter being formed withvan annular recess 4 adapted to receive the Hange 5 which flange forms the outer end of a cylindrical casing member 6 the latter having at its inner end the inturned flange 7,'the casing 6 together with said flanges forming the inner casing member of tlie casing F.

The bore 8 at the inner end of the inner casing member is considerably larger in diameter than the rod E, the inner face 9 of the flange4 7 being disposed in a transverse plane perpendicular to the longitudinal axis of the rod. The casing 6 as shown in the drawings extends approximately the full depth of the chamber C. the flange 5 being fiush with the face 3 of the outer member `and being formed on its underface with an annular groove adapted to register with a similar groove in the outer face .of the stuiing box member B so asto receive the soft metal gasket G whereby the joint between the stuffing box and the. casing is rendered tight, the outer member being provided with bolt holesv 10 to receive the cap screws l1 having screw threaded engagement with the stuffing box member whereby the casing and thelatter may be firmly clamped to ether. l

he wall of the inner casing memberl is of thin metal construction to enable the forming an annular chamber 12` around the piston rodthe chamber 12 communicating with the counterbore 13 in the face 3 of the outer casing member.

The counterbore 13 extends approximately parallel with the face 9 of the flange 7 The outer face 2 of the outer casing member is counterbored to form the annular chamber 16 and a recess to receive the annular clamping ring 17,the latter loosely surrounding the piston rod and being held positioned by means of screws 18 screw threaded in the outer casing member. The clamping ring when positioned is flush with the face 2 and is arranged relative to the bolt holes 10 so that the heads of the cap screws 11 will overlap the latter as shown in Figure 2. In; the chamber 16 are a pair of comparatively thin washers 19 embracing between them, a wicklike substance I adapted to absorb lubricating oil which may be supplied through the duct 2O in the outer casing member.

In the annular space formed between the chamber 12 and the counterbore 13 vare two oppositely disposed spaced elements H surrounding the piston rod and contacting flatly respectively with the faces 9 and 15 of the inner and outer casing members. In the space between the elements and surrounding the rod isr the coil spring 21 engaging said elements at their respective ends and tending constantly to separate them to press said elements against said faces 9 and 15 respectively. Each of said elements comprises a floating ring 22 having two parallel at faces and formed peripherally with a shoulder 23, said ring fitting slidably around the piston rod; a follower ring'24 loosel surrounding the piston rod and formed with1 a peripheral off-set or shoulder 25 to receive and hold centered said coil spring, and having an interiorly tapered or conical surface of about forty-five degrees bevel and adapted to engage andl lit over the conic surface of a. soft metal packing ring 26, the opposite face of the latter fitting flatly against the ring 22. As shown in Figure 5 the packing rin is formed of two segments.

ill of the rings are smaller in diameter than the interior of the member 6 so as to afford steam space for the purpose of intercepting any leakage of steam that may ind its way past the ring 22 of the packing element nearest the cylinder. Obviously, the

follower rings 24: being constantly under` compression of the spring 21 tend to crowd the soft metallic packing rings against the reciprocating piston rod E, the bores 8, 14 and D being suliiciently large to permit the rod to vibrate laterally. The packing elements H are carried bodily with the rod in its lateral vibrations and the meeting surfaces of the rings with the faces 9 and 15 respectively slide upon one another and form a ound lit.

f, however, the pressure in the cylinder should at any time exceed the pressure of the spring 21 and enter the chamber 12 the rin 22 farthest removed from the cylinders un er the influence of the pressure of the steam would be forced against the face 15 and prevent further leakage.

When it is desired to examine the packing the bolts 11 are removed and the outer casing member is slid along the rod, as indicated in Figure 3, the casing and the inner packing element remain intact. By inserting a screw driver between the end of the stulling box and the flange 5, the casing may be withdrawn from the stuffing box chamber C, both packing elements being thereby brought in full view to be examined or replaced.

This arrangement aifords a quick and convenient way of'extracting the packing element from within the chamber C. A further advantage lies in the fact that the compositecasing together with the spring andpacking elements may be conveniently wired together to form a compact package so desirable in cases where large quantities are stored in bins.

I claim:

In a rod packing, the combination with a piston rod, and a stufli'ng box, said stuffing box including a chamber; of a thin shelllike casing member extending freely into said chamber approximately the full length thereof, said casing member having an 1nturned flange at its inner end spaced from the piston rod, and being formed exteriorly with an annular shoulder designed to overlap the surrounding wall of said chamber, an outer member formed with a counter-bore, spaced from the piston rod and adapted to be bolted to said chamber and over said shoulder and clamping said shoulder between itself and the wall of said chamber. said counterbore forming an extension of said stulling box chamber, and oppositely disposed rod packing elements partly located within said ycasing and surrounding the piston rod from said inturned flange to the bottom of said counterbore, said oppositely disposed packing elements being held separated by an extensible coil spring surrounding the piston rod, for the purpose set forth.

- In testimony whereof I aliix my signature.

CHARLES T. WALTERS.

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