Electrofusion marker

Details Electrofusion marker Electrofusion marker

1989-05-19

1990-08-07

Reynolds, Bruce A.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219543, 324326, H05B 358

Patent

active

049470124

ABSTRACT:
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.

REFERENCES:
patent: 4119908 (1978-10-01), Cosman et al.
patent: 4329569 (1982-05-01), Hjortsberg
patent: 4334227 (1982-06-01), Marks
patent: 4486650 (1984-12-01), Bridgstock et al.
patent: 4631107 (1986-12-01), Ramsey
patent: 4712094 (1987-11-01), Bolson, Sr.

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