( 9921 of 9921 ) |
United States Patent | 3,581,084 |
Kaneno , et al. | May 25, 1971 |
A wheel-axle detector for wheeled vehicles following a track having rails with an I-shaped cross section forming a continuous imperforate web with an opposed overhanging head and foot. A piezoelectric element holder containing a piezoelectric element is inserted directly between the head and the foot of the rail such that a portion of the vehicle wheel load borne on the rail is imparted to the element. A detecting circuit is provided to receive and detect the electrical output of the piezoelectric element.
Nov 10, 1967 [JA] | 42/71965 | |||
Current U.S. Class: | 246/249 ; 246/248; 246/251; 310/319; 310/328; 324/162 |
Current International Class: | B61L 1/00 (20060101); B61L 1/02 (20060101); B61L 25/02 (20060101); B61L 25/00 (20060101); B61l 013/04 () |
Field of Search: | 246/246,249,169.5,251 310/8.1,8.7 331/116,139,155 |
2558563 | June 1951 | Janssen |
2755384 | July 1956 | Pierson et al. |
2906865 | September 1959 | Jefferson |
2966582 | December 1960 | Wachtel |
3086109 | April 1963 | Kaehms |
3469116 | September 1969 | Parkinson |