US 5,393,107 AGranted

Plug-in spigot-and-socket joint

AssigneeEisenwerke Fried. Wilh. Duker GmbH & Co.

InventorManfred Vobeck

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Abstract

The spigot-and-socket joint which is secured against sliding is designated to connect the spigot end (3) of a pipe which can be slid into the socket end (2) of another pipe, with radial play existing. In the socket end there are arranged a sealing ring (8) and a separate clamping ring (14) comprising a plurality of circumferentially extending, spaced clamping segments (15) having a spherically convex outer surface (17) and, on an inner surface, a tooth system (19) which, in the presence of axial forces, presses radially onto the spigot end (3) as the spherically convex surface (17) cooperates with a pipe socket's inner surface (18) which tapers conically towards the end. An elastomeric support member (20), which can be fixed in its position at the socket front end and supports the same, is provided on the clamping ring (14). A configuration, which ensures proper retention is obtained when a steel ring (28), which increases the flexural strength of the connecting portion (24), is associated with the support member's thicker annular disk-shaped portion (23), which bears on the socket front face (22), with the portion (24) connecting with the clamping ring (14) issuing from the support member. Particularly in the case of increased rated widths, the clamping ring (14) is conveniently provided with a circumferential recess for accommodating a non-flexing support ring (31) which is preferably made from steel.

A plug-in spigot-and-socket joint which is secured against sliding, for molded components and for socket pipes produced by the centrifugal casting techniques, in which the spigot end of one pipe is slid, with radial play, into the socket end of another pipe having a sealing ring and a separate clamping ring arranged in the socket end, said clamping ring comprising a plurality of clamping segments spaced in the circumferential direction, having a convex outer surface, are joined in the circumferential direction by a vulcanization bonded intermediate layer and have on an inner surface a tooth system radially pressing against the spigot end as the convex surface cooperates with a distally conically tapering inner surface of said socket pipe when axial forces are present,

wherein an elastomeric support member is applied to a front face of said socket and to said clamping ring, said support member comprising an annular disc-shaped portion bearing against the front face of said socket and an approximately conically tapering connecting portion extending from an inner edge of the front face of said socket to said clamping ring, with the connecting portion being widened together with said clamping ring dependent upon outer dimensions of said spigot end introduced and to be stretched in an axial direction on this occasion, wherein the annular disc-shaped portion which bears against the front face of said socket has increased thickness and flexural strength relative to the remaining portions of said elastomeric support member and wherein the inner edge of the front face of said socket is provided with a recessed region matching a cross section of the annular disc-shaped portion, and whereby said clamping ring with the clamping segments and with the vulcanization-bonded intermediate layer connecting the latter in the circumferential direction is provided with a circumferential recess to accommodating a support ring of increased flexural strength relative to said elastomeric support member on a rear side away from the annular disc-shaped portion.

Abstract

Claims7