Sealing Joint for Low Pressure Pipe Systems and Method of Manufacture
AssigneeS & B Technical Products, Inc.
InventorGuido Quesada
Life of this patent
Estimating the term…
Abstract
A method and sealing gasket are shown for providing a sealing joint between a spigot section and a socket section of low pressure plastic pipe, such as drain waste vent pipe that require a minimum of tools and operational steps to complete. The sealing gasket is installed in one of the sections to be joined and the spigot section is inserted within a mouth opening of the socket section with the sections being pressed together in a single operation, thereby forming both the joint and the seal. The sealing gasket is a composite gasket made with one section of a hard plastic material and one section of a thermoplastic elastomer material. No glue or adhesive is required.
Claims15
An assembled low pressure pipe joint, comprising:
- a first section of low pressure pipe having a spigot formed in a first end thereof;
- a second section of low pressure pipe having a socket formed in a first end thereof;
- a sealing gasket for forming a sealed joint between the first and second section of low pressure pipe;
- wherein the spigot of the first section of low pressure pipe is received within the socket of the second section of low pressure pipe and the sealing gasket is disposed there between within a circumferential rectangular raceway formed in an interface of the spigot and socket;
- and
- wherein the sealing gasket is a composite gasket formed with a relatively hard plastic portion of the gasket bonded to a thermoplastic elastomer portion of the gasket.
A method for forming a sealed joint between first and second sections of drain waste vent pipe, comprising the steps of:
- installing a composite sealing gasket within a raceway provided in a socket end of a first section of the drain waste vent pipe;
- providing a second mating section of drain waste vent pipe having a spigot end;
- inserting the mating spigot pipe end into the socket pipe end for a prescribed distance, thereby forming the sealed joint;
- and
- wherein the first section of the gasket is formed of a relatively hard plastic material and the second section of the gasket is formed of a thermoplastic elastomer material.
A method of manufacturing a sealing gasket of the invention, the method comprising the steps of:
- injection molding a first relatively harder plastic part of the gasket in a first injection mold;
- removing the hard plastic part from the first mold and placing the hard plastic part in a second mold;
- injecting the relatively softer rubber or rubber-like material around the hard plastic part in the second mold;
- curing the gasket and removing the gasket from the second mold.
Dependencies are inferred from the claim text.