초록 ▼

An electrofusion coupling (93) for joining together two or more sections of pipe, said coupling comprising: (i) a substantially cylindrical coupling body having an outer surface and an inner surface, the inner surface being sized and shaped to form a clearance fit with the outer surface of the pipe

An electrofusion coupling (93) for joining together two or more sections of pipe, said coupling comprising: (i) a substantially cylindrical coupling body having an outer surface and an inner surface, the inner surface being sized and shaped to form a clearance fit with the outer surface of the pipe regions to be joined; (ii) at least one electrical heating (94) element set on or in the inner surface of the coupling body; (iii) terminal means adapted to connect the electrical heating means to an electrical supply; characterized in that the terminal means does not project beyond the outer cylindrical surface of the coupling body once the welding process is complete.

대표청구항 ▼

The invention claimed is: 1. An electrofusion coupling for joining together at least two sections of pipe, said coupling comprising: (i) a substantially cylindrical coupling body having an outer surface and an inner surface, the inner surface being sized and shaped to form a clearance fit with the

The invention claimed is: 1. An electrofusion coupling for joining together at least two sections of pipe, said coupling comprising: (i) a substantially cylindrical coupling body having an outer surface and an inner surface, the inner surface being sized and shaped to form a clearance fit with the outer surface of the pipe sections to be joined; (ii) at least one electrical heating element disposed adjacent to the inner surface of the coupling body; and (iii) terminal means adapted to connect the electrical heating element to an electrical supply; wherein the terminal means comprises at least one electrical contact point disposed adjacent to the outer cylindrical surface of the coupling body, and at least one temporary terminal, wherein the temporary terminal is bonded to the coupling body over said electrical point in a temporary fashion, such that, at the end of the welding operation, the temporary terminal may be separated from the coupling body to result in a finished coupling with no significant protrusions extending substantially beyond the outer cylindrical surface of the coupling, so as to permit the coupling to form a clearance fit within a secondary coupling. 2. An electrofusion coupling as claimed in claim 1 wherein the electrical contact point is flush with the outer cylindrical surface of the coupling body. 3. An electrofusion coupling as claimed in claim 1 wherein the contact point is formed in a depression within the outer cylindrical surface of the coupling body. 4. An electrofusion coupling as claimed in claim 1 wherein the bond between the temporary terminal and the coupling body is formed by welding the temporary terminal to the coupling body at strategic points. 5. An electrofusion coupling as claimed in claim 1 wherein the terminal means further comprises a shaped entry point to allow a screwdriver blade to be inserted between a temporary terminal and the coupling body such that leverage on the screwdriver causes the two components to separate. 6. An electrusion coupling as claimed in claim 1 wherein the temporary terminal is slidably mounted with respect to the coupling body. 7. An electrofusion coupling as claimed in claim 1 wherein the outer surface of the coupling body incorporates at least one groove to provide at least one passage for vapor and liquid to pass over the coupling when the coupling is assembled within a secondary pipe. 8. An electrofusion coupling as claimed in claim 1 wherein the bond between the temporary terminal and the coupling body is formed by gluing the temporary terminal to the coupling body. 9. An electrofusion coupling as claimed in claim 1 wherein said heating element is set in the inner surface of said coupling body. 10. An electrofusion coupling as claimed in claim 1 wherein said heating element is set on the inner surface of said coupling body. 11. An electrofusion coupling as claimed in claim 1 wherein said electrical contact point is set within said outer cylindrical surface of the coupling body. 12. An electrofusion coupling as claimed in claim 1 wherein said electrical contact point is set on said outer cylindrical surface of the coupling body. 13. An electrofusion coupling for joining together at least two sections of pipe, said coupling comprising: (i) a substantially cylindrical coupling body having an outer surface and an inner surface, the inner surface being sized and shaped to form a clearance fit with the outer surface of the pipe sections to be joined; (ii) at least one electrical heating element disposed adjacent to the inner surface of the coupling body; and (iii) terminal means adapted to connect the electrical heating element to an electrical supply; wherein the terminal means comprises at least one electrical contact point disposed adjacent to the outer cylindrical surface of the coupling body, and at least one temporary terminal, wherein the temporary terminal is bonded to the coupling body in a temporary fashion, such that, at the end of the welding operation, the temporary terminal may be separated from the coupling body to result in a finished coupling with no significant protrusions extending substantially beyond the outer cylindrical surface of the coupling and wherein the temporary terminal is slidably mounted with respect to the coupling body. 14. An electrofusion coupling for joining together at least two sections of pipe, said coupling comprising: (i) a substantially cylindrical coupling body having an outer surface and an inner surface, the inner surface being sized and shaped to form a clearance fit with the outer surface of the pipe sections to be joined; (ii) at least one electrical heating element disposed adjacent to the inner surface of the coupling body; and (iii) terminal means adapted to connect the electrical heating element to an electrical supply; wherein the terminal means comprises at least one electrical contact point disposed adjacent to the outer cylindrical surface of the coupling body, and at least one temporary terminal, wherein the temporary terminal is bonded to the coupling body in a temporary fashion, such that, at the end of the welding operation, the temporary terminal may be separated from the coupling body to result in a finished coupling with no significant protrusions extending substantially beyond the outer cylindrical surface of the coupling and wherein the outer surface of the coupling body incorporates at least one groove to provide at least one passage for vapor and liquid to pass over the coupling when it is assembled within a tight-fitting secondary pipe.