| 摘要 |
480,655. Thermal switches. STOTZKONTAKT GES. Sept. 20, 1937, No. 25511. Convention date, Sept. 21, 1936. [Class 38 (v)] A thermal switch comprises a spring toggle j pivoted at h and engaging the free end of a bimetallic strip f fixed to a terminal c. Circuit is normally completed from terminal c through strip f, contacts g, e spring d to terminal b. When the strip f becomes heated, either due to current in the strip, or a separate heating coil, the strip snaps downwards to break circuit. When this happens, a collar p on a spring- biassed rod k moves upwards and lies in the path of the strip f thus preventing its return on cooling. The switch is reclosed by manually depressing rod k to release the strip f which then snaps to the closed position in which position however it cannot be held. |
