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US 12,259,076 B2Granted
Electrofusion joint
AssigneeSekisui Chemical Co., Ltd.
InventorsAyaka Kitagawa, Hiroaki Kondou, Kouzou Makino
Life of this patent
Estimating the term…
Abstract
An electrofusion joint includes a main body and a heating wire. The main body is configured to be connected to a resin pipe containing a thermoplastic resin. The heating wire is in the main body. The heating wire includes a conducting wire and an insulating cover film that is around the conducting wire. The insulating cover film has a melting point of at least 230 degrees.
Claims6
An electrofusion joint, comprising:
- a main body configured to be connected to a resin pipe containing a thermoplastic resin;
- and
- a heating wire,
- wherein:
- the heating wire includes a conducting wire, an insulating cover film in an annular shape around the conducting wire, and an outer layer portion in an annular shape around the insulating cover film;
- the insulating cover film has a melting point of at least 230° C.;
- and
- the outer layer portion is made of a polyolefin-based resin;
- the main body includes:
- a tubular portion having a connecting portion configured to:
- (i) be disposed inside or outside the resin pipe;
- (ii) be connected to the resin pipe;
- and (iii) receive the resin pipe;
- and
- a stopper protruding from an inner surface of the tubular portion, the stopper being configured to restrict an insertion position of an end of the resin pipe when the resin pipe is inserted into the connecting portion;
- the stopper is configured to protrude radially inward less than an inner peripheral surface of the resin pipe when the resin pipe is inserted into the connecting portion;
- the heating wire is in the stopper;
- the heating wire is wound three or more times along an axial direction of the tubular portion in the stopper;
- and
- the heating wire is wound around the stopper in a single spiral shape.
17 more elements
An electrofusion joint, comprising:
- a main body configured to be connected to a resin pipe containing a thermoplastic resin;
- and
- a heating wire,
- wherein:
- the heating wire includes a conducting wire, an insulating cover film in an annular shape around the conducting wire, and an outer layer portion in an annular shape around the insulating cover film;
- a melting point of the insulating cover film is higher than a melting point of the main body;
- the outer layer portion is made of a polyolefin-based resin;
- the main body includes:
- a tubular portion having a connecting portion configured to:
- (i) be disposed inside or outside the resin pipe;
- (ii) be connected to the resin pipe;
- and (iii) receive the resin pipe;
- and
- a stopper protruding from an inner surface of the tubular portion, the stopper being configured to restrict an insertion position of an end of the resin pipe when the resin pipe is inserted into the connecting portion;
- the stopper is configured to protrude radially inward less than an inner peripheral surface of the resin pipe when the resin pipe is inserted into the connecting portion;
- the heating wire is in the stopper;
- the heating wire is wound three or more times along an axial direction of the tubular portion in the stopper;
- and
- the heating wire is wound around the stopper in a single spiral shape.
16 more elements
Dependencies are inferred from the claim text.