Title:
欠陥検出システム
Document Type and Number:
Japanese Patent JP4514088
Kind Code:
B2
Abstract:
The present invention relates to a failure detecting system that enables the detection of a break in a rail and the like by a simple network configuration. Detecting units (20 and 50), relay units (30A, 30B, 60A through 60C) and terminal units (40 and 70) are arranged along rails (11, 11A and 11B). Using the rails (11, 11A and 11B) as transmission media, ultrasonic waves transmitted from the detecting units (20 and 50) are transmitted to the terminal units (40 and 70) by the relay units (30A, 30B, 60A through 60C), and when the terminal units (40 and 70) receive the ultrasonic waves, the ultrasonic waves are returned from the terminal units (40 and 70), relayed by the relay units (30A, 30B, 60A through 60C), and transmitted to the detecting units (20 and 50). Thus, it is judged whether there is a break in the rails (11, 11A and 11B), based on the ultrasonic wave reception state in the detecting units (20 and 50).
Inventors:
Masayoshi Sakai
Toshito Shirai
Akira Morisada
Toshito Shirai
Akira Morisada
Application Number:
JP2002524690A
Publication Date:
July 28, 2010
Filing Date:
December 01, 2000
Export Citation:
Assignee:
Nippon Signal Co., Ltd.
International Classes:
G01N29/44; B61K9/10; B61L23/04; E01B35/00; G01N29/04; G01N29/07; G01N29/32; G01N29/36; G01N29/38; G10K11/24
Domestic Patent References:
| JPS56128542U | 1981-09-30 | |||
| JPS5051352A | 1975-05-08 |
Foreign References:
| WO1999066320A2 | 1999-12-23 | |||
| US5743495A | 1998-04-28 |
Attorney, Agent or Firm:
Tomijio Sasashima
Haruyuki Nishiyama
Haruyuki Nishiyama