| 摘要 |
542,013. Magnetic relays; actuation of switches. TOMLINSON, A. V. (Compagnie des Freins et Signaux Westinghouse). June 19, 1940 No. 10580. [Class 38 (v) ] [Also in Group XXXVI] A switch comprises a piston 26 of magnetizable material which is normally moved to closed position, against the pressure of a spring 27, by pressure of a medium circulating in cooling pipes, but breaks the circuit . if the circulation stops. A permanent magnet 30 the poles of which straddle the cylinder 24, moves about a pivot 29, following the movement of the piston, so operating a mercury switch 33, shown closed. |
