US1510816A - Metallic packing for pistons - Google Patents

Description

Oct. 7, 1924. 1,510,816

4 R. ALLEN METALLIC PACKING FOR PISTONS Filed April '7, 1923 3 Sheets-Sheet l 'cile/g Oct. 7', 19M. 1,510,816

R. ALLENv METALLIC PACKING FOR PISTONS Filed April '7, 192.3 I 3 Sheets-Sheet 2 3 g J //I/// METALLIC PACKING' FOR .PISTONS Filed. April 7.-,1923 3 Sheets-Sheet 55 Patented Get 7, 1924,

UNITED STATES PATENr'oFFIcE."

ROBERT ALLEN, 0F OXON, ENGLAND.

'if f l j METALLIC PACKING Fon, Prs'roNs. L liij Application med April 7, 1923. seriai No. 630,572. f

T 0 all whom t may concern.'

Be it known that I, ROBERT ALLEN, of Chiltern Rise, Woodcote, Oxon, England (whose post-oiice address is Chiltern Rise, I/Voodcote, Oxon, England), a subj ect of the King of Great Britain and Ireland, ha-ve invented certain new and useful Improvements in Metallic Packings for Pistons, of which the following is a speciiica-tion.

This invention relates to metallic packing for pistons and the like, and is applica-- ble to the pistons of internal combustion engines, steam engines, compressors and in general to all pistons where it is desired to provide an effective seal between the piston and its surrounding cylinder Wall.

According to this invention, each packing unit comprises a pair of split rings arranged side by side in the same groove with their joints or splits diametrically opposed, and joint or split closing or choke pieces adapted to prevent leakage of pressure fluid through the splits in the rings, said choke pieces being pressed outwards radially by springs and each engaging the split part of one ring and the neutral part of the other ring, that is to say, the part diametrically opposite the split or joint of the ring. Each choke piece is also formed or provided in known manner with a projection or stop for engaging in the split portion or gap of the ring, and preventing the ring from turning in its groove.

In the accompanying three sheets of illustrative drawings:

Figs. 1 and 2 are a longitudinal and transverse section respectively of a piston with packing constructed according to this invention,

Figs. 3 and 4 are similar views to Figs. 1 and 2. showing a slightly modiiied form of construction and Figs. 5 and 6 are elevations at right angles of one of the split packing rings,

Fig. 7 illustrates in end, side and sectional detail views a socket provided in some cases for holding the split-closing piece or choke and its spring,

Figs. 8 and 9 are detail views of splitclosing pieces or chokes.

choke pieces are not in alignment, Abeing preferably arranged so that the part of the pocket or recess from which a joint or split closing segment f of the choke projects, is cut entirely in the side wall of the groove. Each choke piece d, d is recessed at its outer end to a depth corresponding with the groove in the piston and under the iniuence of its spring g presses outwardly on both packing rings, the said choke being located opposite the split portion of one ring which is closed thereby and opposite that part of the other ring which is diametrically opposite its split, the result being that both rings are pressed outwards by the two plungers or choke pieces both at their joints or split portions, and at their opposite or neutral points, and by this means closecontact between the rings and cylinder wall at all parts of the periphery is ensured.

A stop 7L is either formed on the choke plunger as clearly shown in Fig. 8 or may be attached in the form of a stud as shown in Fig. 9. The stop z, is intended by engaging an enlargement i of the split (Fig. 5) to prevent the split ring from turning in its groove.

In some cases as shown in Figs. 3 and4 and Fig. 7, socket pieces j for the reception of the chokes d, d may be secured in radial' holes bored in the piston body, the walls of the sockets being enlarged at their open or outer ends to form shoulders y" which rest against shoulders formed by counter-boring the radial holes. The enlarged outer ends of the socket pieces are also grooved or recessed as at 7c, to accommodate the packing rings.

I claim The combination with a piston or the like having a packing groove and recesses opening into said groove at diametrically o posite points, of a pair of split packing rings arranged in said groove, side by side, and tion disposed between and pressing against with their joints diametrically opposite and the ends of the other ring, whereby both disposed over said recesses, spring-pressed rings are maintained expanded but are 10 plungers mounted in said recesses, each of locked against rotation in said groove.

5 said lungers being provided with a portion In testimony whereof he has aiiixed his pressing against the intermediate portion of signature.

one ring. and with another projecting por-l ROBERT ALLEN`

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