US1914632A - Packing ring and method of making - Google Patents

Description

5mm 2 3) 1933, QALEY PACKING RING AND METEOD OF MAKING Filed Feb. 24, 1930 [N VENTOR Patented June '20, 1933 UNITED. 1");

T'ES- PATE'NT OFFI CE EPHRAII CALEY, OF KALAMAZOO, MICHIGAN, ASSIGNOR TO DURAMETALLIC CORPORATION, OF KALAMAZOO, MICHIGAN IPAG KING RING AND METHOD OI MAKING Application filed February 24, 1930. Serial No. 430,521.

The main objects of this invention are:

First, to provide an improved packing which is in effect jointless and at the same time one which is formed of composite material.

- Second, to provide a packing ring consisting of a core or filler portion of plastic material and an outer metallic covering.

Third, to provide a method .of'making packing rings having the features above indicated.

Objects pertaining to details and economies of my invention will definitely appear from the description to follow. The inveni5 tion is defined .in the claims.

The manner of carrying out my invention is clearly illustrated in the accompanying drawing, in which:

Fig. l is a fragmentary view illustrating one of the steps of my improved method of making packing and the material entering therein.

Fig. 2 is a perspective View illustrating another step.

Fig. 3 is a perspective view illustrating still another step.

Fig. 4 is a perspective view of the finished ring.

Fig. 5 is a perspective view illustrating a step in the manufacture of a modified form of packing ring.

Fig. 6 is a perspective view of a modified form of packing ring.

Fig. 7 is a perspective'view illustrating one form in which my improved packing may be marketed.

In the manufacture of my improved packing rings I form a plastic compressible mixture designated generally by the numeral 1 40 in Fig. 1, and consisting of a fibrous material, preferably long-fibered asbestos, fragments of metal such as shreds or small pieces of metal foil, and a lubricant, preferably graphite and oil. This material is wrapped in thin sheet metal 2 such as metal foil, see Fig. 1.

The resulting product is indicated at 3 in Flg. 1.

This product as shown in Fig. 1 is preferably further compressed and reduced in di-' ameter as by passing through a reducing and compacting die which results in a ropelike strand such as shown at 4, Fig. 2. The wrapping and compacting result in crinkling the wrapping material forming a multiplicity of folds and pockets in which the lubricant material is enclosed and retained.

. Pieces of the strand 4 of suitable length are formed into coils as shown in Fig. 3, preferably two or more coils, with the ends of the strands in opposed relation. These coils are placed in a forming die and pressed to the desired dimension which results in an endless packing ring 7 with the joints practically invisible, the ring being of substantially uniform density throughout. This is possible owing to the character of the filler and covering.

Where a split ring such as shown in Fig. 6 at 8 is required, the ends of a single coil are beveled as at 9 and the coil pressed into a ring of desired dimensions. This ring may be opened to facilitate placing upon a shaft or the like. However, it should be borne in mind that very satisfactory split rings may be provided by cutting the ring of Fig. a on abevel. When such a ring is placed into a box the joint is effectively sealed or closed, owing to the character of the material entering into the ring.

If desired a plurality of coils as 5 may be formed from the strand, as shown in Fig. 7, and these coils introduced in a packing box asthere disclosed, and the gland tightened forming in effect an endless ring within the packing box. The packing box itself serves as the forming member.

Owing to the character of the material the packing accurately conforms to the box and the shaft. Even when previously formed into a ring, as shown in either Figs.

4 or 6, the rin readily adjusts and conform to the box an shaft to which it is a plied.

By this method mg improved pac ing may be very'rapidly pro uce and is adapted for a great variety of uses. The alloys or metals used may be varied in accordance with the pur ose for which the packing is to be used.

aving thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. The method of making packing rings consisting of wrap ing a mixture of asbestos fiber, fra ents 0 metal foil, graphite and oil in a s eet of metal foil, partially compacting, forming into a coil of more than one lap, and subjecting to pressure in a forming die to produce a substantially endlex ring.

2. The method of making packin rings consisting of wrapping a compressib e plastic packing mixture in thin sheet metal, forming into a coil of more than one lap, and pressing into a substantially endless ring.

3. A packing ring consisting of a filler or core material of asbestos fiber, fragments of metal and lubricant, and an encasmg wraper of metal foil coated with lubricant and aving a multiplicity of crinkles and convolutions.

, 4. A packing rin consisting of a filler or core material of reely intermixed shreds of asbestos fiber, comminuted fragments of metal and oil and graphite lubricants, and an encasing wrapper of metal foil coated with lubricant and having a multiplicity of crinkles and convolutions therein.

5. A packing ring comprising a core of plastic packing material, and an encasing wrapper of foil having a multiplicity of crin es and convolutions.

In witness whereof I have hereunto set my hand.

EPHRAIM CALEY.

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