US1357739A - Method of manufacturing packings for rotating shafts - Google Patents

Description

, y c'. STEENSTRUP. METHOD 0F MANUFACTURING PACKINGS FOR ROTATING SH l y* APIPLICATION FILED SEPT. 20. i919. 1,357,739.

AFTS.

Patented Nov. 2, 1920.

I inventor: Christianteenstrub I-l is Attorn e9.

UNITED sTATEs PATENT OFFICE.

CHRISTIAN S-TEENSTRUP, 0F SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

METHOD OF MANUFACTURING PACKINGS FOR ROTATING SHAFTS.

Specication of Letters Patent.

Patented Nov. 2, 1920.

Application led September 20, 1919. Serial No. 325,196.

T o all 'whom -z't may concem Be it known that I, CHRISTIAN STEEN- s'rRUr, a citizen of the Fnited States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Methods of Manufacturing Packings for Rotating Shafts, of which the following is a specification.

The present invention relates to packings, such as are used to prevent leakage betweenl a rotating shaft and an adjacent wall through which the shaft passes and `particularly to packings of the type comprising a plurality of thin-edged, annular teeth or projections which are carried by the rotating shaft and the adjacent wall or which are carried by the wall and pack against the outer surface of the shaft. Packings of this character are well-known and are termed labyrinth or cellular packings.

The object of the present invention is to provide an improved method of manufacturing packings of. the type referred to, which is economical to carry out. and by means of which a large number of the thingated strip edged, annular teeth or projections may be rovided in a comparatively short space.

A further object. of the invention is to provide an improved method in which all the operations are of a simple character and can be carried out by the ordinary workman without the use of special tools. whereby hi hly sllled labor will not be required.

or a consideration of what I believe to be novel and my invention, attention is directed to the accompanying description and the claims appended thereto.

Inthe accompanying drawing, Figures 1 to 8 inclusive illustrate successive steps in carrying out the method and Fig.` 9 shows a. modification.

In carrying out y improvedimethod I take a strip of corrugated met-al 15 as shown in Fig. 1 and fasten it to a fiat sheet of meta-l of suitable length. width and thickness as shown at 16 in Fig. 2. The corru- 15 may be made in any suitable thin material and the corrudepth depending on the radial depth which it is desired' the teeth shall have in the finished packing. Likewise the corrugationsv will be of such width as to give the desired spacing of the teeth.

mannery from gatlons will have a.

pack against the surface of` formed is removed from diametric-ally opposite the meety Such corrugated strips can be very readily made as is well-understood. The corrugated st'rip 15 is preferably fastened to the metal sheet 16 by brazing or welding and after being fastened into place the sheet 16 with the corrugated strip 15 fastened thereon will have the appearance in end elevation as shown in Fig. 3. The side edges of sheet 16 are beveled as indicated at 17 so that such sheetmay be attached to a holder by a dovetail connection as will be referred to hereinafter. After the corrugated strip 15 has been fastened to sheet 16 a section of it is then wound about a former 18 of suitable diameter and cut off so as to form a tube of the same diameter as the former. (See Fig. i). The tube will thus comprise a backing piece which is formed from sheet 16 with the corrugated strip 15 fastened on its outer surface. eveled edges 17 will be located at the two ends of the tube. The tube thus former 18 and split at a polnting point of the two edges of the section so as to form the tube into two halves as indicated in Fig. 5 and as shown in section in Fi 6. The outer surface of the corrugations is t ien ground off leaving projecting rings or teeth as shown at 19in Fig. 7, such rings or teeth being formed from the radially extending parts of the corrugated strip. The respective halves of the tube are then mounted in a suitable holder 2O as shown in Fig. 8 which holder in turn is mounted on the shaft 21 which is`to carry the packing rings. The holder 20 may be made in two halves and is providedwith a circumferential slot of the width of the tube and having undercut edges to receive the beveled end 17 of the tube. This forms a very firm mounting for the tube and packlng teeth 19. In Fig. 8, 22 indicates .the adjacent stationary wall between which and the shaft the packing is arranged.

In Fig. 9 I have shown a modified form withA the corrugated vstrip 15 on the inside instead of on the outside.

By the foregoing method a. packing can be made having the teeth -or annular projections as close together as is found desirable; also very thin material may be readily used in making the corrugatedstrip and it can be easily handled while being fastened to the backing she'et since the corrugations stifen the strip and prevent bending of the corrugations crosswise of the strip. As is well recognized, it is desirable that the packing teeth or project-ions be made from as thin material as possible.

The method also results in a packing in which the packing' teeth are firmly anchored or fixed to the part carrying them, and in a packing which can be easily replaced or repaired in case it is damaged. Furthermore, the same strip material, that is, the sheet 16 with a corrugated strip 15 fastened thereto as shown in Fig. 3 can be lnade into packings of any desired diameter and for being carried by the shaft as shown in iF ig. 8 or by the surroimding wall as shown in l? ig. 9; or if desired by both .the shaft and the surrounding Wall with the packing teeth interleaving as is well under-v stood.

ln accordance with the provisions of the patent statutes..- l have described mv improved method in connection 1With the steps that l now prefer for carrying it out, but it `will be understood that the specihc steps described are only illustrative and that the method may be carried out by such steps as come WithinF the terms of the appended claims.

What l claim as new and desire to secure by Letters Patent of the United States, is

1. rl`he method of manufacturing a packing element comprising a plurality of annular, radially extending teeth which comprises fastening a strip of corrugated metal toa holder and then removing the outer portion of the corrugation to leave outwardly projecting teeth.

2. rlhe method of manufacturing a packing element comprising a plurality of annular, radially extending teeth which comprises fastening a strip of corrugated metal to a holder and removing those portions of the corrugations which are parallel to the holder and spaced therefrom.

3. 'lhe method of manufacturing a packa tube with ing element which comprises fastening a strip of corrugated material on a flat -hacking sheet, bending the backing sheet to form a tube with thecorrugations on one side thereof, and removing from the free side of the corrugated material that portion of it which extends parallel to the backing sheet.

4. The method of manufacturing a packing element which comprises fastening a strip of corrugated' material on a dat backing sheet, bending the backing sheet to form the corrugations on one side thereof, removing from the free side of the corrugated material that portion of it which extends parallel to the backing sheet and fastening the backing sheet to a supporting holder.

5. llhe method of manufacturing a packing element which comprises fastenin a strip of corrugated material on a flat backing sheet., bending the backing sheet to form a tube with the corrugations on one side thereof, removing from the free side of the corrugated material that portion of it which extends parallel to the ba .n g sheet, fastening the backing sheet to a supporting holder, and mount-ing the supporting holder on the part which is to carry the packing.

6. 'l`he method of manufacturing a packing element Awhich comprises providing a tube having a strip of corrugated material fastened on one surface thereof and grindin od the corrugations until only the radial portions remaln..

'i'. 'l`he method of manufacturing a packing element which comprises providing `a tube having a strip of corrugated material fastened on one surface thereof, grindin od the corrugations until only the radial portions remain and mounting the tube on a part which is to carry it.

8. 'lhe method of manufacturing a. packing element which comprises fast strip of corrugated material on a flat backing sheet having beveled edges, backing sheet to form a tube, olf the corrugations until only the radial portions of them remain, and mounting said tube on av holder with the beveled ends engaging undercut grooves in said holder.

ln witness whereof, l have hereunto setv my hand this lmh day of September, 1919.

' `"refieran s'rnnus'rnur.

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