Restrained gasket for plastic pipes
AssigneeMcWane, Inc.
InventorsDaniel A. Copeland, Michael C. Keel
Life of this patent
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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.
Claims31
A pipe gasket for restraining a spigot of a first pipe within a bell of a second pipe, the pipe gasket comprising:
- a compressible annular body, and
- a plurality of rigid segments partially embedded within the compressible annular body,
- wherein at least one rigid segment of the plurality of the rigid segments has an exposed surface defining a unitary spigot tooth and including opposing lateral edges, a proximal edge, a distal edge and a substantially flat portion that extends to and between the distal edge and the unitary spigot tooth.
A pipe gasket comprising:
- a ring fabricated from a compressible material, the ring having an inner annular surface and an outer annular outer surface,
- a void within the ring,
- a first opening extending through the inner annular surface and into the void, and
- a restraining segment seated within the void, the restraining segment including a spigot tooth extending radially inward from a proximal edge of the restraining segment and a flat portion extending distally from the unitary spigot tooth to a distal edge of the restraining segment,
- wherein the flat portion is essentially flush with the inner annular surface.
A pipe gasket for restraining a spigot of a first pipe within a bell of a second pipe, the pipe gasket comprising:
- a compressible body having an inner annular surface and an outer annular outer surface,
- a first opening in the inner annular surface, the first opening having opposing lateral edge portions, a proximal edge portion and a distal edge potion,
- a restraining segment partially embedded within the compressible body, the restraining segment having a first face that extends to and between the opposing lateral edge portions and to and between the proximal edge portion and the distal edge portion of the first opening,
- wherein the first face defines a spigot tooth extending along the proximal edge portion of the first opening and includes a substantially flat portion extending distally from the single spigot tooth to the distal edge portion of the first opening.
A method of restraining a spigot of a first plastic pipe within a bell of a second pipe comprising:
- providing a pipe gasket including rigid locking segments, at least one of the locking segments including a spigot tooth and a flat surface extending to and between the spigot tooth and a distal edge of the at least on locking segment,
- seating the pipe gasket into an annular groove of the bell,
- inserting the spigot of the first plastic pipe into the bell and through an opening defined by the pipe gasket, and
- engaging the spigot tooth with the spigot.
Dependencies are inferred from the claim text.