US402267A

US402267A - Piston-packing

Info

Publication number: US402267A
Authority: US
Publication date: 1889-04-30
Anticipated expiration: 1906-04-30

Description

(N0 ModeL-j G. H. MEADBR.

PISTON PACKING.

No. 402,267. Patnted Apr. 30,1889.

INVEN TEIR 4 Q71. war

, packing-ring.

UNITED STATES PATENT OFFICE.

GEORGE I'I. MEADER, OF BOSTON, MASSACHUSETTS.

PISTON-PACKING.

SPECIFICATION forming part of Letters Patent No. 402,267, dated April 30, 1889.

Application filed October 25, 1888. Serial No. 289,125. (No model.)

To aZZ whom it may concern.-

Be it known that I, GEORGE H. MEADER, of Boston, in the county of Suffolk and State of Massachusetts, a citizen of the United States, have invented a new and useful Improvement in Piston-Packing, of which the following is a full, clear, and exact description, reference being had to the accompanying; drawings, forming a part of this specification, in explaining its nature.

The invention relates to a packing-ring for pistons, which comprises, essentially, a cleft expansible ring which is practically T-shaped in cross-section and which is held between a bull-ring or other holding device made in two parts and shaped upon their opposing edges to form a channel to receive the narrow in wardly-extending section or web of the packing-ring, and a steam-expanding recess upon each side of its head or rim. A T packingring of this construction and so held is adapted to be expanded upon each movement of the piston by the action of the steam against one side of the head or rim of the packingring, and then byits action upon the opposite side of the headof the ring, according as the piston is moved in the cylinder.

The invention further relates to various details of organization and construction, all of which will hereinafter be described,

In the drawings, Figure 1 is a view in longitudinal section of a cylinder and piston with my packing-ring attached thereto. Fig. 2 is a View in elevation of one section of the bull-ring. Fig. 3 is a view in elevation of the Fig. 4 is a view in elevation of the other section of the bull-ring. Fig. 5 is a view illustrating the relation of the packingring to the two sections of the bull-ring. Fig. 6 is a View in plan of one section of the bullring. Fig. 7 is a view in plan of a part of the packing-ring. Fig. Sis a view in plan of a part of the other section of the bull-ring from that shown in Fig. 6. Fig. 9 represents the application of the packing to a solid-headed piston. Fig. 10 is an enlarged sectionalview.

A represents the bull-ring or support for the packing-ring B. This bull-ring or support is represented in Figs. 1, 5, and 10 as made in two parts, a a. The part a has the section or sleeve c of less diameter than the main part of the section a. It also has at the end of the sleeve the wall a, which extends outward to a narrow annular surface, a*. From this narrow annular surface there extends an inclined surface orwall, a to or very nearly to the outer edge of the bull-ring.

The section a of the bull-ring or support for the piston-packing ring has an annular recess, a, at one end, of a size to fit upon the sleeve a of the section a; and it also has upon its inner side the wall of, the narrow annular surface a and the inclined wall a". There is formed upon or attached to the sleeve a a key-block, C, which serves two purposes, first, by entering a hole, 0, in the wall a of the section a it prevents the section from being turned on the sleeve a and it also serves, as will hereinafter appear, to hold the pistonpacking ring from turning upon the bull-ring or other support. There is formed upon the section a of the ring, on a line with the key, an extension, e, and upon a position opposite the said extension 6 another extension e. These extensions are for use in connection with the packing-ring.

The packing-ring B is represented in Figs. 1, 3, 5, 9, and 10. It is formed with the inwardly-extending section or web b, of practically uniform width, and has the head or rim (1, which extends from each side of the web, forming a somewhat wide outer bearing-sun face, 17 and upon each side of the web b an-.

inclined or tapering surface, 17 which extends from each side outwardly to the edge of the head or rim. In other words, it has practically the same cross-section as the crosssection of the holding-recess D, between the .two sections a a, of the bull-ring orholding ring or support when together, with the exception that the outer part of said recess is.

somewhat wider than the width of the rim or head, so that when the packing-ring is in and sections of the head or rim are removed from the web of suificient extent to allow the flanges to extend between the two abutments or pieces e e, as represented in Fig. 5, these sections acting as a packing to the joint in the ring.

In Fig. 9 I have represented the packing ring as applied to a solid-headed piston, the piston being made in two parts or sections, one of which, the section F, is formed to correspond to the section CL of the bull-ring so far as the parts receiving the packing-ring are concerned, and the part F has its packing-ring-holding section or part of substantially the shape of the section a of the bullring above described. These corresponding parts, however, instead of being formed upon the bull-ring, which is itself secured to the spider of the piston, as represented in Fig. l, are formed upon sections of the piston itself. This enables the packing-ring to be placed upon a somewhat narrow or thin piston.

It will be seen that the end of the sleeve a of the part (t of the bull-ring comes in contact with the wall at the end of the annular recess a. of the part a, and that this regulates the width of the channel or recess of the ring which receives the web of the packingring. This channel or recess must be of sufficient width to permit or allow the web of the pack ing-ring to move freely therein.

It will be observed that there is upon each side of the'head or rim of the packing-ring a space or recess, h h, to which the steam has access, alternately, from the end of the cylinder supplied with it, the steam entering said recess through a narrow passage or channel between the wallof the piston and that of the cylinder, and that this serves to expand or move the ring outwardly from the bull-ring or support to bring its head or face into contact with the wall of the cylinder and to maintain it there duringthe reciprocation of the piston, first, by the steam acting from one end of the piston, and upon the reversed movement of the piston by the steam acting from the other end. The piston is so placed or located in the cylinder that the cheeks and joint of the packing-ring are against or upon the bottom of the cylinder.

The advantages of the construction arise from its simplicity and cheapness, and from the fact that the packing-ring is double-acting, which permits it to be used upon practically all kinds of engines having reciprocating pistons.

I am aware of the patent to N. Hunt, N 0. 68,989, dated September 17, 1867, for enginepistons, but the same does not contain the essential elements of my invention.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- 1. The combination, in a piston-packing, of a section of a ring or holder having the sleeve (1 the wall a and the inclined surface a, with the removable section having the annular recess a, the wall (1 and the inclined section a, and the cleft or divided packing-ring B, having the flange b and head or rim 1), extending from both sides of the flange and contained or held between the said two sections, substantially as described.

2. The combination of the section at, having the sleeve a the key 0, extending from the sleeve, and the section a, having the recess a, with the packing-ring B, having the flange b and the head or rim 1), and the recess 0 in the flange to receive the key, substantially as described.

3. The combination of the sectiona of the bull-ring or support havingthc projection or check 6, the section a of the bull-ring or support having the projection or cheek e, the two sections being shaped to provide, when together, the packing-ring-holding space D, with said packing-ring B, the head or rim of which is cut away on each side of the opening to provide recesses, into which said cheeks or projections e e enter, substantially as described.

GEO. ll. MEADER.

\Vitnesses:

F. F. RAYMOND, M, J. M. DOLAN.