Restrained gasket for plastic pipes
AssigneeMcWane, Inc.
InventorsDaniel A. Copeland, Michael C. Keel
Life of this patent
Estimating the term…
Abstract
A gasket for preventing the separation of a pipe joint formed between plastic pipes such as pipes manufactured from PVC. The invention provides an internally restrained pipe joint including a bell with a substantially V-shaped annular groove. The annular groove includes a front radial wall and a rear radial wall and a gasket seated in the annular groove. The gasket includes an inner radial face, an opening defined by the inner radial face and an outer radial face with a front radial section located adjacent to the front radial wall of the annular groove and a rear radial section located adjacent to the rear radial wall of the annular groove. A plurality of toothed, rigid restraining segments is at least partially embedded in the gasket.
Claims21
A restrained pipe joint comprising:
- an annular gasket located within an annular groove of a bell socket of a first plastic pipe, the annular gasket including a plurality of rigid segments partially embedded within the annular gasket, each rigid segment of the plurality of rigid segments including at least one spigot tooth row having opposing lateral edges and a first length extending to and between the opposing lateral edges;
- and
- a second plastic pipe inserted through an opening defined by the inner annular surface, the second plastic pipe having an outer surface with a circumference of a second length, each of the at least one spigot tooth row impinging upon the circumference,
- wherein a sum of all of the first lengths is less than 70% of the second length.
A restrained pipe joint comprising:
- an annular gasket located within an annular groove of a bell socket of a first plastic pipe,
- a plurality of rigid segments partially embedded within the annular gasket, each rigid segment of the plurality of rigid segments including a spigot tooth;
- and
- a second plastic pipe inserted through an opening defined by the inner annular surface, the second plastic pipe being impinged upon by the plurality of rigid segments,
- wherein the second plastic pipe includes:
- (a) an exterior face having a first group of space-apart indentations formed therein by a first group of the plurality of rigid segments, the first group of spaced-apart indentations forming a first group of corresponding protrusions on an interior face of the second plastic pipe, the first group of corresponding protrusions forming a first contiguous protrusion, and
- (b) a second group of spaced-apart indentations formed in the exterior face by a second group of the plurality of rigid segments, the second group of spaced-apart indentations forming a second group of corresponding protrusions on the interior face of the second plastic pipe, the second group of corresponding protrusions forming a second contiguous protrusion.
A restrained pipe joint comprising:
- an annular gasket located within an annular groove of a bell socket of a first plastic pipe, the annular gasket including an inner annular surface defining a circumference having a first length and a plurality of rigid segments partially embedded within the gasket, each rigid segment of the plurality of rigid segments including (a) a spigot tooth, (b) opposing lateral edges intersected by the circumference, and (c) a second length extending to and between the opposing lateral edges,
- wherein a sum of all of the second lengths is between about 40% to 70% of the first length.
An annular gasket comprising:
- an inner annular surface that defines a circumference of a first length;
- and
- a plurality of rigid segments partially embedded within the inner annular surface, each rigid segment of the plurality of rigid segments including at least one spigot tooth row having opposing lateral edges and having a second length extending to and between the opposing lateral edges,
- wherein a sum of all of the second lengths is less than or equal to 70% of the first length and the plurality of rigid segments are arranged in groups of two or more rigid segments, each of the groups of two or more rigid segments being separated by an adjacent group of two or more rigid segments by a distance that is greater than the second length.
Dependencies are inferred from the claim text.