US550755A - Metallic packing - Google Patents

Description

(No Model.)

` E. M. HEDLEY.

METALLIC PACKING.

Ne. 550,155. Petented Dees, 1895.

@www yer iiNiTnD STATESA PATENT OFFICE.

EDWARD M. I-IEDLEY, OF ELIZABETH, NEV JERSEY.

METALLIC PACKING.

SPECIFICATION forming part of Letters Patent No. 550,755, dated December 3, 1895. Alpplicationrled January 18, 1895'. 'Serial No. 535,303r (No model.)

.To all whom t may conce-7%.?

Be it knownthat I, EDWARD M. HEDLEY, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certainnew and useful Improvements in Metallic Packing, of which the following is a full, clear, and exact specification.

The objects of my invention are, first, to construct a metallic packing for pistons, valve-stems, and pump plungenrods, so that steam or any vapors or liquids shall be effectually prevented from escaping therefrom; second, to construct the said packing entirely of metal and in such a manner that any wear of its parts shall be at all times compensated for by the automatic adjustability of such parts, and, third, to provide a means for automatically adjusting the said parts to form a constantly-effective packing by such adjustment.

With these obj ects in View reference is had to the annexed speciiication and drawings, in which- Figure l is a longitudinal sectional view of the complete metallic packing and automatic compensating means. Fig. 2 is a longitudinal sectional view of a cage having a slip-joint. Fig. 3 is an end view of the three segments constituting the metallic packing proper. Fig. 4 is aperspective viewof two of the packing-segments with the third segment removed. Fig. 5 is a front end view, partly broken away, of the outer cover or gland for said packing and improved oil-cup. Fig. 6 is one of a pair of metal stop rings or gaskets. Fig. 7 is an edge view of Fig. 6 partly broken away, and Fig. 8 is an elevation view of a helical spring.

A represents a valve-stem. Around said stem are arranged, preferably, though the number may be varied, three segments B B B. These segments are all of the same construction and have each two projections l? b, arranged oppositely and each on different sides of a line drawn concentrically through the center of said segments, as shown, each projection bof said segments overlapping and having a close contact with similar proj ec tions on the next segment adjacent thereto, so that when all of the said segments are placed around a valve-stem they thus interlock to form a complete circle and packing,

havingV only radial breaks c c c longitudinalV with the long line of said valve-stem, each of the concentricallyarranged joints CZ being close joints formed by the union of the sides of the overlapping projections b.

A large thread e is formed along the outer diameter of the three segments, and a closelywound helical spring F, of a smaller diameter than the outer diameter of the segments B, is formed and screwed into the said threads e over the said segments B. The coils of the said spring in being thus screwed over the said segments are thereby spread as wide apart as the said threads e, into which the said coils fit. It is thus seen that the spring F, in addition to binding the segments around a valve-stem or piston, also binds the overlapping edges d of the projecting portions b of the segments B closely together. Thus it is seen that the segments form a continuous metallic packing-ring which always closely iits the piston or valve-stem and readily and automatically compensates for wear of either 'of the said parts. rlhe ends of the said seg ments are preferably evenly iinished off, and

stop or end rings G, having an inner evenA surface g and an outer beveled surface g', are iitted closely around said stem or piston and abut against the ends of the said segments. The said segments are given their position upon the valve-stem and the said rings G are held tightly against the said segments by means of a cover or gland H H and a spring I, located inside of said cover or gland. A slip-joint casing formed of the parts J J surrounds and entirely incloses the above-said segments, the said slipjoint being formed, as at j, by means of the parts J JQ nicely telescoping upon each other. A battened inner surface j g7'2 is arranged, respectively, within the interior of each of the portions of the said cases J J', the saidbatten surfaces having a contact with and serving the purpose of holding the rings G against the ends of the segments B.

A ledge Z is formed upon the portion J of the casing and against the centering-ring lf, located within and against one end of the part H" of the cover or gland. The opposite portion J of the said casing is iitted with a formed or located in the end of the said cas- IOO ing J, as shown, said gasket having a close contact with a surface 'm' of the inner portion of the cover or gland H. It is thus seen that a tight joint is formed at the jointsj d, the union of the pieces B B B with the movable stem, and between the gasket M and the surface m/ of the portion H'of the coverl or gland, which latter is formed of the two parts H H, as shown by the breech h, in which is interposed a gasket h' to render the union of the parts H H tight at their meeting portion.

Ordinary bolts are passed Jthrough holes n, which are formed in the projecting portions N at the parts H II', only one of which proj ections is here shown, to bind the said parts tightly together, as in ordinary stufng-boxes.

Figs. l and 5 represent a cross-section and a front broken view, respectively, of an improved oil-box formed by casting the part H so that a recess O will be formed concentric with the valve-stem, in which recess can bey ify the said invention.

What I therefore claim, and desire to secure by Letters Patent, is

l. A metallic packing composed of two or more segments of a ring, a thread formed around and along the circumference of said segments, a helical spring arranged to iit said thread and to combine and hold said segments together, the convolutions of said thread being spaced farther apart than the normal relative positions of the convolutions of said helical springs, substantially as set forth.

2. In a metallic packing, having a metallic packing ring formed of segments surrounding a rod, a cage, formed of two parts and having a close telescoping joint and surrounding said rod, a bevel formed at the interior of each of said cage parts concentric with said rod, a stop ring abutting against cach end of' said segments, bevels formed on one surface of each of said stop rings, the said bevels having close frictional contact with the aforesaid bevels of the said cage parts, a spring exerting a continuous pressure upon a portion lof said cage and upon said ser; ments, a Contact formed between a portion of one of said cage'parts and a gland, the said gland surrounding the whole lconstruction, substantiallyv as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 20th day of November, 1894.

EDVVD. M.V IIEDLEY.

Witnesses J. SAMPAYS, A. CUMMINGS.

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