US116336A - Improvement in piston-packings - Google Patents

Description

YU'Nrrnn l'S'rrrrns PATENT n FFICE.

JAMEs McALoNAN, on NEw YORK, N. Y.

IMPROVEMENT IN PISTON-PACKINGS.

. Specification forming part of Letters Patent N 0. 116,336, dated J une-27, 1871.

To all uhom itymag/ concern:

Be it known that I, 'J AMES' MCALONAN, of the city, county, and State of New York, have invented a new vand Improved Piston -Packingg and I do hereby declare th'at the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which- Figure l represents a longitudinal central section of a piston provided with my improved packing, the plane of section beingindicated by the linea' x, Fig. 2. Fig. 2 is a transverse section of the same on the line y y, Fig. 1. Fig. 3 is a detail central section ofone ofthe inner rings. Fig. 4 is an outer, and Fig. 5 an inner-face v iew of one of the Lexpanding spring-plates.

Similar letters of reference indicate corresponding-parts.

My invention consists in the improvements upon piston-packin g, which are hereinafter fully described and subsequently pointed'out in the claims.

Ain the drawin g represents a tubular pistonrod, of suitablelength and diameter. To it are secured the heads or end plates B C of the piston, both of equal diameters. The end of the tube receiving-the plates .B C is made conical,

- as shown in Fig. 1, the central apertures of thev plates being tapering to fit it, Vand a nut, a., screwing` upon the extremity of the piston-rod, crowding them home. The plate B has a projecting central block or core, b, which reaches to the other plate C, so as to determine the distance between the same, besides forming a support for the expanding pins. Through the piston-rod is tted a small bar, D, which carries a conical plug, c, in line with the-core b. Through the core are fitted three or more transverse pins E E, which can be moved outwardly toward the periphery of the piston by pulling the bar D.

The outer end of the bar D projects beyond the piston-rod, andreceives a nut, d, whereby itl can be longitudinally adjusted in the pistonr-f-rod.

The nut d' has a tubular extension, c, which is closed by a screw-cap, f. rlhe pins E E extend with their/outer ends against the expanding spring-plates F F. The ends of each springplate F are V-shaped, or double inclined, as in Figs. 4 and 5, and t into recesses which are provided intwo split rings, G- G, that are set one upon the other, between the plates B (l. These recesses g in the rings G are cut slanting, as shown in Fig. 1, so that whenever the-plates F are pushed outwardly by the pins E they will not only expand the rings G, but also crowd them against t-he plates B C to let the joints be absolutely tight. The rings G G are close within the outer piston-rings H and I. The latter are triangular in their cross-sections, and put together so that the long sides of the triangles comen contact, as is clearly shown in Fig. l.

Whenever the piston leaks, the cap f is unscrewed andthe nut d turned so as to pull the core c, and thereby expand the pins E. The pins crowd against the rings G so as to spread them, and with them the rings H I, until the outermost ring I fits the cylinder properly. The lengthwise extension of the two rings G G shared by the rings H I, which slide in the inclined surface between them so as to crowd against the plates B C. As the pins E do not work steam-tight in the core b, the steam, if it enters the piston, will also pass into the tube A and betray an imperfect iit by its escape when the cap f is removed. The proper iit of the piston can thus always be ascertained without removing the cylinderhead, and connected by merely turning the nut d. A plug', h, is screwed into the inner end ofthe tube A to keep it closed, or an equivalent stop is applied.

Having thus described my invention, I claim as new and desire to'secure by Letters Patent- 1. The spring-plates F F, provided with doubleinclined ends, whereby they crowd the rings G G apart while expanding them, as specified.

2. The double rings G G, provided with the inclined recesses g, to bemoved apart while expanded, as set forth.

3. The nut cl, provided with the tubular extension c and with the 'screw-cap j', to regulate the sliding bar D, substantially in the manner specifred. l

. JAMES MCALONAN.

Witnesses:

JOHN MoALoNAN, GEO. -W. MABEE.

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