Method and apparatus for making through-bores

Details Method and apparatus for making through-bores Method and apparatus for making through-bores

1997-03-06

1999-07-27

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

340680, 340686, 324 67, G08B 2100

Patent

active

059297573

ABSTRACT:
The invention relates to a method and apparatus for marking entrance and exit opening sites in opposite surfaces of a wall member of a perforation to extend therethrough and is provided, at one surface at a site corresponding to one of the entrance and exit openings with a wave signal transmitter and, at the other surface with a wave signal receiver responding to transmitted signals by rendering an indication of a maximum strength wave signal as a function of the location of the other of the entrance and exit opening. In a preferred embodiment, the receiver is mounted on a drill or the like at a predetermined distance from the axis thereof and the transmitter is provided with a cantilever provided with a marker spaced from the transmitter at a distance corresponding to the predetermined distance.

REFERENCES:
patent: 3704413 (1972-11-01), Blevins
patent: 4998058 (1991-03-01), Tofte et al.
patent: 5434500 (1995-07-01), Hauck et al.

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