US984888A

US984888A - Piston-packing expander.

Info

Publication number: US984888A
Application number: US59337910A
Authority: US
Inventors: George Christenson
Original assignee: Johns Manville Corp
Current assignee: Johns Manville Corp
Priority date: 1910-11-21
Filing date: 1910-11-21
Publication date: 1911-02-21
Anticipated expiration: 1928-02-21

Description

G. GHRISTENSUN. PISVTON PACKING EXPANDER. APPLICATION FILED NOV.`21, 1910.

PasnteaFeb. 21, 1,911

UNITED sra'LswPATENT ouin-on.

GEORGE cHBIsTENsoN, or NEVADA. MISSOURI. iA'ssIGNoR To H. w. JOHNS-MANVILLE COMPANY, A` CORPORATION OF NEW YORK.

PISTON-PCKING EXPANDER.

Specification of Letters Patent.

Patented Feb. 21, 1911.

application med november-"21, 1910. serial No. 593,379.

-for use on pistons in the cylinders of air brakes.

My present invention 1s an improvement `on the constructions shown in my Patent No. 802,540, dated Aug. 6, 1.907, and that l shown in patent to John Emory Meek, No.

. above noted.

924,087, dated June 8, 1900. ln a packing expander for air brake pistons of the gencral character shown in my said patent it is desirable, both for economy of material, and for reasons of adaptability to existing structures, to -makc the flange portion as thin as possible, as set out in the patentto Meek But in order to secure the highest degree of elasticity and resiliency in the completed structure, it is necessary t0-use a highly tempered steel, and such highly tempered steel can not conveniently be` drawn down lto the thin flange desired, when the structure is made integral by the process of drawing through a die, which is the most economical method of manufacture. To avoid the diiiicult-ies arising from these conflicting conditions I have invented a composite structure in which the resiliency is furnished by a ring of spring steel'of preferably circular cross section while thc flange is formed of a thin strip of sheet. steel which may be of low temper and less resiliency.

The best form of apparatus at present known to me embodying my invention is illustrated in the accompanying sheet of drawing in which:

Figure 1 is a perspective View of the exandcr ring, and F ig. 2 is a cross section on ine 2-2 of Fig. l.

Through the drawings like reference chan. acters indicate like parts.

5 is the ring of highly tempered steel, preferably of circular cross section, which may be formed by cutting the required length from a steel rod of the proper size and bending to form a circle. 6 is a strip of thin sheet metal. or mild steel, eut from an ordinary sheet of4 such material. This thin strip of metal ntay be attached to the` ring 5 in any convenient vay, as by welding, but preferably I fasten it by bending a portion 4 of one edge of the strip about the 60 ring 5, as shown in the drawings. Preferably the abutting ends of the circular structure so formedarc cut diagonally, as indicated at 7 in Fig. 1.

The advantages of my invention include. the prod" Lion at low cost of a packing expander having the highest resiliency and the thinnest possible flange. The fiange being formed of metal of low temper will bend without breaking, so that the possibilities of destruction in use and handling are decreased, as well as those in manufacture.

Various chr.l es in shape and proportions of parts could be made in p actice without departing from the principle of my invention. In some cases the ring 5 might. be omitted if the bent strip of metal 6 had sufficient elasticity and resiliency, but preferably I employ the ring 5, as it can be given the necessary temper to produce exactly the graduated degree of resiliency desired for different sizes of cylinder and differentV degrees of air pressure, while it would be practically difliculty if not impossible 'to give a very high temper to the thin strip 6 and then bend or draw it into the shape required. i

Having, therefore, describedl my invention, I claim: l 1. A piston packing expander having in combination a ring of elastic metal and a thin strip of sheet material fastened .to the ring and forming a flange thereon, extending at right angles to the plane of the ring.

Q. A pistonpacking expander having in combination a ring of elastic inetal and a thin strip of sheet material wrapped around the ring and projecting at ri ht angles tothe plane of the ring to form a ange thereon.

composite piston packing expander formed of a ring of spring steel of "'ci'rcular cross section, and a strip of sheet st* bent around the ring and projecting at right angles to the plane of the ring to forni a flange from the outer side of the ring.

4. A composite piston expander formed of a ring of steel of high temper, and a Strip of sheet metal of low temper and high duclility fastened to 'the ring :1nd forming a flange thereon, extending :it right angles to the pla-ne of the ring.

.3. A Composite pimin expander formed of :i ringof'stvznmf liigggli temper, and zx strip tilitxY bont :i1-mind the rilwA and no'ecinq l h l.

nt right anillas to the plane of the ung to forni a flange from the outer sld@ 0l the ring.

` (i. A nihil mw inclini" ex )ander comhaving nnc odge cin-ved bnvk upon itself and the strip-so formed bnnt Into a Circle Wll'h dismnnected but nlinftnig ends, the Short bent edge of t'llc Simp lwing on tho Inside of the ring' so fm'nwd. und the long nncnrvcd edge extendingy nt ,right ingles m the' plane of sand ring.

GEORGE (l1 l Rl'lll f'itnessesz A. PARKER Snri'ln, M. G. Cmwifonn.-

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