초록 ▼

An electrofusion marker which fuses two pipe sections together and acts as a passive electronic marker. The electrofusion marker includes a tubular thermoplastic fitting having a coil therein, which is temporarily energized by a power supply. This heats the fitting, causing it to fuse with the pipe

An electrofusion marker which fuses two pipe sections together and acts as a passive electronic marker. The electrofusion marker includes a tubular thermoplastic fitting having a coil therein, which is temporarily energized by a power supply. This heats the fitting, causing it to fuse with the pipe sections. The coil doubles as an inductor, and a capacitor connected in parallel with the coil creates a resonant LC circuit. After the pipe sections have been fused together and buried the joint may be thereafter located by emitting a signal into the ground, which is picked up by the resonant circuit and re-radiated. The radiated signal is detected by a receiver, indicating location of the electrofusion marker and joint.

대표청구항 ▼

A device for coupling two elongated members and electronically marking the coupled joint, comprising: a hollow, thermoplastic fitting member having an inner wall; resistance means for heating said fitting member when said resistance means is connected to an external power supply, whereby said fittin

A device for coupling two elongated members and electronically marking the coupled joint, comprising: a hollow, thermoplastic fitting member having an inner wall; resistance means for heating said fitting member when said resistance means is connected to an external power supply, whereby said fitting member becomes fused around the elongated members; and means connected to said resistance means for creating a resonant circuit.