Measuring and testing – By abrasion – milling – rubbing – or scuffing
Patent
1993-09-13
1995-08-08
Noland, Thomas P.
Measuring and testing
By abrasion, milling, rubbing, or scuffing
451 6, 408 16, G01N 356
Patent
active
054388600
ABSTRACT:
In a cutter bit abrasion detecting device of a shield excavator comprising a plurality of cutter bits arranged on the front surface of a cutter head rotatably provided in front of a shield body for excavating a working place, a sensor hole or sensor holes are formed in each of some of the cutter bits and sensor heads each comprising a U-shaped single-core optical fiber accommodated in a casing are inserted thereinto. As a result, sensor heads can be thin to be easily inserted into the sensor holes having a small diameter so as to be set in cutter bits with ease since the single-core optical fiber is employed and the attenuation of light received by the sensor head can be reduced due to the attenuation of light between a reflector plate and the optical fiber since no reflector plate is employed, so that accuracy in detection is improved.
REFERENCES:
patent: 4091654 (1978-05-01), Hurtig et al.
patent: 4370834 (1983-02-01), Habib
patent: 4420253 (1983-12-01), Pryor
patent: 4558686 (1985-12-01), Ono
patent: 4667113 (1987-05-01), Nakajima et al.
patent: 4748988 (1988-06-01), Green et al.
patent: 4884434 (1989-12-01), Satake et al.
Kawai Kazunari
Miura Hiroshi
Kabushiki Kaisha Komatsu Seisakusho
Noland Thomas P.
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