发明名称 |
Elektrisch verschmelzender Markierer. |
摘要 |
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. |
申请公布号 |
DE69012203(D1) |
申请公布日期 |
1994.10.13 |
申请号 |
DE1990612203 |
申请日期 |
1990.04.26 |
申请人 |
MINNESOTA MINING AND MFG. CO., SAINT PAUL, MINN., US |
发明人 |
MINAROVIC, JOE T. C/O MINNESOTA MINING & MANF.CO., ST. PAUL, MINNESOTA 55133-3427, US |
分类号 |
F16L47/02;B29C65/00;B29C65/34;B29C65/36;B29C65/68;F16L47/03;G01V15/00 |
主分类号 |
F16L47/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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