发明名称 |
Method and apparatus for monitoring the relative position of a cable boring head during a boring operation |
摘要 |
To more accurately detect the position of a boring head (16) relative to a utility conveyance (22) during a boring operation, the conveyance carries a low power, pulsed signal. The signal is detectable only with a limited distance from the conveyance corresponding to a minimum allowable distance between the boring head and the conveyance. The boring head (16) carries at least one detector (28) for detecting the signal radiated by the cable. If the detector (28) detects the signal, then the boring head is too close and boring operation is interrupted.
|
申请公布号 |
US5994904(A) |
申请公布日期 |
1999.11.30 |
申请号 |
US19970939141 |
申请日期 |
1997.09.29 |
申请人 |
AT&T CORP |
发明人 |
ESLAMBOLCHI, HOSSEIN;HUFFMAN, JOHN SINCLAIR |
分类号 |
E21B47/022;E21B47/024;E21B47/09;G01V3/20;(IPC1-7):G01R19/00;G01V3/08;G01V3/10 |
主分类号 |
E21B47/022 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|