Claims
- 1. Process of forming an opening using a hand-held drilling device including a drilling or chisel bit in a masonry construction material having an outside surface, with the construction material containing steel reinforcing members spaced inwardly from the outside and being electrically conductively interconnected, comprising the steps of drilling into the construction material from the outside surface, providing a signal when the bit in the drilling device contacts a reinforcing member, wherein the improvement comprises measuring the electrical resistance of the construction material between the bit and the reinforcing member during the drilling step through a direct electrical connection with the reinforcing members, and providing the signal when the electrical resistance drops as the bit one of approaches or contacts the reinforcing member, and using the signal for controlling the operation of the drilling device.
- 2. Process of forming an opening using a hand-held drilling device including a drilling or chisel bit in a masonry construction material having an outside surface, with the construction material containing steel reinforcing members spaced inwardly from the outside surface and being electrically conductively interconnected, comprising the steps of drilling into the construction material from the outside surface, providing a signal when the bit in the drilling device contacts a reinforcing member, wherein the improvement comprises measuring the electrical resistance of the construction material between the bit and the reinforcing member during the drilling step through a direct electrical connection with the reinforcing members, and providing the signal when the electrical resistance drops as the bit approaches the reinforcing member, and using the signal for controlling the operation of the drilling device.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3443590 |
Nov 1984 |
DEX |
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Parent Case Info
This is a continuation-in-part of application Ser. No. 802,756, filed Nov. 27, 1985.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
3206354 |
Feb 1982 |
DEX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
802756 |
Nov 1985 |
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