US396222A - Silas heebeet moshee - Google Patents

Description

(No Model.)

. S. H. MOSHER.

PACKING.

No. 396,222. Patented Jan. '15, 1889.

w mm

UNITED STATES PATENT OEEIcE.

SILAS HERBERT MOSHER, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO CHARLES F. ELMES, OF SAME PLACE.

PACKING.

SPECIFICATION forming part of Letters Patent No. 396,222, dated January 15, 1889.

Application filed March 19, 1888.

T all whom, it may concern:

Be it known that I, SILAs HERBERT MosHER, of Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Packing; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of'reference marked thereon, which form 1o a part of this speciiication.

This invention relates to an impro ved packing for use in glands or packing-boxes of pistons and in other similarsituations. The invention consists in the matters hereinafter set forth, and pointed out in the appended claims.

The invention may be more readily under# stood by reference to the accompanying drawings, in which- Figure l is a sectional view of a piston-rod and a gland or packingI or stuliing-box provided with a packing' constructed in accordance with my invention. Fig. 2 is a crosssection of the same taken upon line c c of Fig. l. Fig. 3 is a perspective view of a single coil of the soft-metal pipe or tubing used for the packing. Fig. a shows a straight section of pipe or tubing, partially in side view and partially in section, said pipe or tubing 3o being perforated and filled with a solid lubrieating compound in accordance with one part of the invention. Fig. 5 shows a perspective view of ring-shaped piece of .perforated tube in readiness for insertion in the gland or packing receptacle.

In the said drawings, A indicates a pistonrod, as of an engine; B, a cylindric head.

C is a gland or stufiing-boX, D the cap thereof, and d (l screw-bolts for holding the cap in place and for forcing the same into the box to tighten the packing. Said screw-bolts are herein shown as passing through the cap and having' screw-threaded engagement with a iiange, c, of the stuffing-box in the usual manner.

E indicates the packing as a whole, and e e two coils or pieces of coiled soft-metal pipe or tubing composing the same. In practice one or more than two of such coils may be placed 5o within the gland between the cylindric wall thereof and the piston-rod. The drawings,

shown in the drawings.

Serial No. 267,598. (No model.)

however, show a gland of ordinary size land construction, containing two layers or coils of pipe or tubing. Said-coils of tubing e are placed within the gland close together or in contact with each other, so that an endwise compression of the mass will result in' a lateral expansion or thickening of the same, which will force the inner coil closely into contact with the piston-rod. This result will 6o -of course follow from the flattening of the individual pipe-coils under endwise compression of the packing however the coils are arranged with relation to each other; but I prefer to place the convolutions of the inner coil opposite and partially between the meeting surfaces of the other coil, so that, when the coils are compressed endwise the inclined vsurfaces of the coils, in contact with each other, will tend to force the coils apart and 7o to press the inner coil against thepis'ton-rod, even when there is no actual compression of the pipes or tubes themselves. The arrange-v ment of the coils last referred to is clearly Vhatever be the arrangement of the coils in respect to eachv other, however, the endwise compression of the entire packing will finally result in thev flattening, crushing in, or distortion of the tubes, so that they will more closely t against 8o the piston-rod and against each other. Such compression of the packing may be continued, furthermore, until the packing' is worn out o1" until it has become too much compacted, or,

in other words, too solid for further eifective services.

Fig. 3 shows a single coil of soft-metal tubing in readiness for insertion in a stuffingbox. It is of course obvious that a packing consisting of a single coil acts substantially 9o in the same manner as does the packing shown in Fig. 1. In the case of a single coil, however, the lateral pressure of the tubing against the piston is produced 'solely by the flattening of the coils in one direction and o5 the spreading of the same in the other direction as pressure is applied endwise to the coil by the forcing in of the cap of the stuffing-box.

In compressing the packing the coil in conM roo tact with the piston-rod will be -iiattened against the rod as the pressure upon the packingy is increased, so that the said inner coil Will have a bearing-surface of considerable width in contact with the piston-rod. In practice, therefore, the packing is compressed until a sufficient area of the tube composing the inner coil is brought against the pistonrod to make a suitable tight joint. It is obvious, for instance, that when the tube is merely coiled about and against the pistonrod it will have a very narrow surface in bearing thereon, and the packing will be liable to leak under any considerable pressure. By compressing the packing', however, the inner coil will be caused to bear, not only with a greater pressure, but upon a larger arca of the piston-rod, so that by suitably graduating the compression of the packing the sameinay be accurately adjusted to withstand any usual pressure upon the packed joint without producing any unnecessary friction between the parts in bearing with each other.

The packing made as above set forth may be supplied with lubricant in the ordinary manner. It is to be noted, however, that the lubricant accumulating' in the spaces between the convolutions of the inner coil will be continually fed to the relatively-narrow surfaces of the coils which are in contact with the piston-rod, so that the construction described greatly facilitates a constant and uniform distribution of the lubricant.

In Fig. 4t I have shown a piece or section, E', of soft-metal tubing which is provided with perforations c for the escape of lubricant from its exterior to the surfaces to be lubricated. A tube thus made may be employed merely as a means of easily and conveniently conducting lubricant into the interior of the packing and for discharging' such fluid lubricant upon the surface of the sliding part in contact with the said packing. The tubing shown in said Fig. ,4t is, however, provided with a filling, E2, of ,fibrous material, (shown in said figure as formed by a rope or twisted iibers of approximately the same size as the interior of the tube.) Vithin the tube is also placed a solid or non-fluid lubricant or lubricating compound. I prefer to use as a lubricant a compound containing tallow or other non-fluid oily substance, and graphite;

but a fatty or oily lubricant alone may be used, or other compounds may be employed. The lubricant thus introduced into the perforated pipe is forced from the perforations as the packing is compressed, and thus at- .fords a constant supply of lubricating material until the packing is no longer compressible.v

It will of course be understood that a solid or semi fluid lubricant maybe employed with out the iibrous lling. The soft metal perforated tubing coi'itaining a lubricant may be made so cheaply as to enable the packing to be removed and replaced by a n ew tubing at a small expense whenever it is worn out or the supply of lubricant is exhausted.

The fibrous illing has the obvious advanl tage of preventing the complete collapse of the tube when thelatter is compressed. Such illing also acts to absorb and hold a liquid lubricant, so as to enable such lubricant to be used instead of a solid lubricant, such as will be required when the fibrous filling is absent.

In Fig. 5 l have shown a piece, E3, of tubin bent into ring form with its ends abutting. The packing maybe made in this way instead of in the form of a coil, as shown in Figs. l, 2, and 3. The ring' shown in Fig. 5 is filled with fibrous and lubricating material, and isl perforated in the manner above described.

I claim as my invention.-

l. A packing' for piston-rods and the like, consisting of soft-metal pipe or tubing surrounding the same, provided with perforations, and iilled with a non-duid lubricant, substantially as described.

2. A packing for piston-rods and the like, consisting of soft-metal pipe or tubing surrounding the same, having perforations, and provided with a iibrous filling saturated with a lubricating substance, all substantially described.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

SILAS HERBERT MOSIIER.

Vitnesses:

(i). CLARENCE PooLE, O. N. XVILLIS.

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