Self-contained instrument for measuring subterranean tunnel wall

Details Self-contained instrument for measuring subterranean tunnel wall Self-contained instrument for measuring subterranean tunnel wall

1976-08-02

1978-05-30

Meister, J. M.

Selective cutting (e.g., punching)

With specific means to select a single tool

Interposer

83229, 234130, G06K 105

Patent

active

040919900

ABSTRACT:
The deflection of a subterranean tunnel is measured with a rod-like, self-contained instrument that is adapted to be inserted into a radially extending bore of the tunnel adjacent an end of the tunnel where the tunnel is being dug. One end of the instrument is anchored at the end of the bore remote from the tunnel wall, while the other end of the intrument is anchored adjacent the end of the wall in proximity to the tunnel wall. The two ends of the instrument are linearly displaceable relative to each other; the displacement is measured by a transducer means mounted on the instrument. Included in the instrument is a data storage means including a paper tape recorder periodically responsive to a parallel binary signal indicative of the measured displacement.

REFERENCES:
patent: 266593 (1882-10-01), Johnson
patent: 3051376 (1962-08-01), Oldenburg et al.
patent: 3104053 (1963-09-01), Rabinow
patent: 3289509 (1966-12-01), Cahill
patent: 3307781 (1967-03-01), Jones, Jr.
patent: 3536256 (1970-10-01), Purps

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