US843230A - Metallic packing. - Google Patents

Description

No. 843,230. I PATBNTBD FEB. 5, 1907. r. MoGARTHY. METALLIC PACKING.

APPLICATION FILED NOV. 15, 1906.

HHH

avwenfot Wit eases FELIX McCARTHY, OF POTTSTOWN, PENNSYLVANIA.

METALMG PACKING.

specification of Letters Patent.

Patented Feb. 5, 1907.

Application filed November 16,1906. Serial No. 343,622.

Be it known t. at I, FELIX hlCCARTllY, a citizen of t? e United States, residing at Pottstown, in tiie county of Montgomery and State of Pennsylvania, i ave invented certain new and useful Improvements in ldctallic Packing; and I do l ereby declare ti 0 following to be a full, clear, and exact description oft: e invention, such as will enable otlers skilled in tite art to wlich it appertains to make and use tlie same.

My invention relates to new and useful improvements in packing, and more particularly to ti at class adapted to be used for packing pistons, pipes, and tie like; and my object is to provide a packing of ti is class wl ereby as tilO parts of tlie packing become worn the same will be automatically (lepressed and lield into engagement with the surrounding parts.

A furtlier object is to provide a packing wltereby tlie parts tliereof will expand and contract to accommodate inequalities or variations in tlie diameter of piston-rods.

A furtlter object is to provide means for retaining non-leat-conducting material on the faces of t-lte packing-rings wl en ti o same are used in connection with l:et-blast pipes.

A still furti. er object is to provide yielding means for liolding and compressing the packing-rings witiin tile stalling-box.

Otler objects and advantages will be liereinafter referred to and more particularly pointed out in tle claims.

In tiie accompanying drawings, which are made a part of tlfs application, Figure 1 is a central sectional view tiirough a stu'lling-box, showing my in'iproved packing disposed around a llOt-blfiSt pipe. Fig. 2 is a plan view of one of tlie packing-rings on an enlarged scale, and Fig. 3 is a sectional view through one of tlt e packing-rings.

Ti e form of packing l1 erein sit own is adapted more particularly for use upon hot-blast pipes, although the same may be used on piston-rods for steam-engines and also for valve-stems, or, in fact, any rod or slaft requiring a packing. In using tle packing in connection with hot-blast pipes tl e pipe 1 is disposed tlrough a stulling-box 2, and disposed witliin tr e stuffing-box and surrounding tlie pipe 1 is a plurality of packing- rings 3 and 4.

Tlie packing-rings 3 are designed to engage tlie surface of tlie pipe 1, wlile tlie rings at are adapted to engage the inner face of the stulling-box, and all of said rings are preferably constructed in two or more sections and w: on assembled togctlier are of less circumference tl. an tile circumference of tie pipe 1, so tiiat tIe meeting ends of tie several sectionswill be spaced apart, as best shown at 5 in Fig. 2 of tie drawings, tie objeet in so spacing tl'e sections being titat w: en tilO faces of tie rings become worn tl'ey may be directed into closer relation with tlieir bearing-surfaces by directing pressure against ti o rings.

One outer edge of the packii'ig-rings 3 is cut away to form a beveled face (5, wide one of tire inner edges of tie packing-rings t is cut away to form a similar beveled face 7, and when ti 0 rings are properly disposed within tle stulling-box tie beveled face of one ring is disposed into cooperation with the beveled face of tire next succeeding ring, and by disposing several sets of tlie rings within tile stulling-box and staggering tle spaces 5 it will be seen that a thorough packing will be provided.

The packingrings are l:eld within the stullingbox by means of a gland S, tl c outer end of wlich is provided with a flange 9, tlzrough wrich are disposed bolts 10, one end of eacn of wlich is tl readed into tlie body of tie stullingbox, w ile tiie outer ends thereof are tlreaded to receive nuts 1 1.

Disposed around tle bolts 10 and between tle nuts and flange are springs 12, tlte tension of wlich l old tl'e end of the glands into engagement with tlte packing-rings under pressure, so that as the bearing-faces of the rings become worn tie springs will cause tire rings 3 to contract around tie pipe and the rings 4 to expand and engage tne face of the stulling-box.

'lhe object in beveling the faces of the packing-rings is to cause each set of the rings to telescope with each other when pressure is directed thereagainst, and by having the outer edge of the rings 3 beveled and the inner edge of the rings l similarly beveled it will be seen that the packing-rings 3 will be directed inwardly, while the packing-rings 4 will be directed outwardly, thereby insuring that said rings will be in contact with their respective bearing-surfaces at all times.

111 using a metallic packing in connection with a hot-blast pipe, as shown, it is necessary to protect that portion of the packing contacting the pipe as much as possible from the heat, and to this end I have provided on the bearing-face of each of the packing-rings bricated at all times.

The rings employed in connection with a hot-blast pipe are preferably made of brass, owing to the intense heat within the pipe, as a softer metal would readily melt. When, however, the packing is to be used in connection with piston-rods or steam-valves, the grooves in the packing-rings 3 may be filled with a softer metal, such as Babbitt, or said packing-rings may be entirely constructed of the softer metal, and it will be readily seen that a softer metal will absorb the oil the same as the asbestos, so as to keep the wearing-surface thoroughly lubricated.

It has been found in practice that pistonrods are frequently larger at one portion than at another, and by holding the gland into engagement with the packing by means of the springs it will be seen that as soon as the enlarged portion of the shaft is moved into engagement with the packingrings that the gland will move outwardly, thereby releasing the tension upon the packing-rings and allowing the same to expand to accommodate the enlarged portion of the shaft. As soon, however, as the enlarged portion of the shaft is removed from engagement with the packing-rings said rings are returned to their normal position by the pressure of the springs, so that the packing-rings will adjust themselves to any inequalities in the surface of the rod.

In drilling the opening in the stuffing-box a curved surface 15 is left at the bottom of the stuffing-box, and in order to give the packing-rings a solid base to rest upon I provide a filling-ring 16, one face of which is curved to fit the curved surface 15, while the opposite face thereof is flat, so that the adjacent packing-ring will rest firmly thereon, thereby preventing the sections of the ring from tilting and binding.

By this construction it will be seen that I have provided a very cheap and economical form of packing and one that will adiust itself to all inequalities in the surface of the rods passing therethrough. It will further be seen that I have provided means for keeping the wearing-faces of the packii'ig-rings into close engagement with the surfaces to s-eaaeo which the rings are applied and automatically operating said rings to compensate for wear thereon. It will also be seen that by disposing the springs in the position shown that they will be under the observation of the attendant at all times and the tension thereon readily increased or decreased by operating the nuts 11 inwardly or outwardly upon the bolts 10.

What I claim is 1. In a packing of the class described the combination with a stuffing-box, a gland for said stuffing box and a shaft extending through said stuffing-box and gland; of a plurality of packing-rings disposed in pairs one ring of each pair being adapted to contract while the opposite ring is adapted to expand when pressure is applied thereon, said rings having telescoping beveled faces, grooves within the wearing-faces of said contracting rings, a filling for saidgrooves and means to exert tension upon the gland.

2. A packing of the class described comprising a plurality of segmental rings disposed in pairs, each ring having a beveled face adapted to cooperate with a beveled face on the opposite ring whereby when pres sure is directed against said rings the seg ments of one ring will contract while the segments of the opposite ring will expand, a groove within the wearing-face of the contracting ring and a filling for said groove.

3. In a packing of the class described the combination with a stuffing-box and a gland therefor; of segmental packing-rings adapted to be disposed in said stuffing-box, said packing-rings being disposed in pairs, one of which rings is adapted to contract and the other to expand, the contracting ring having a beveled outer face and the expanding ring having a beveled inner face adapted to cooperate therewith a groove within the wearingface of the contracting ring, a filling for said groove, bolts secured to said stuffingbox and extending into engagement with said gland, springs on said bolts whereby the gland will be directed into engagement with said packing-rings and hold the same under pressure.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FELIX MCCARTHY.

Vitnesses:

A. J. BERNI-IART, J. HOWARD KENNEY

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