Patents Assigned to Firma Microtherm GmbH
  • Resettable thermal safety switch
    Patent number: 4118683
    Abstract: A resettable thermal safety switch having a bistable domed bimetallic disc serving as a heat-responsive switching element which pops from its normal curvature to an opposite curvature, thereby moving a contact breaking plate, the switch having a reset button which is arranged to return the disc to its normal state and to close the switch, but between the reset button and the moving parts of the switch is arranged a force-limiting assembly which prevents resetting or blocking of the switching action at the critical temperature.
    Type: Grant
    Filed: June 30, 1977
    Date of Patent: October 3, 1978
    Assignee: Firma Microtherm GmbH
    Inventor: Gerhard Schwarz
  • Non-resettable heat responsive safety switch
    Patent number: 4025889
    Abstract: A non-resettable heat responsive safety switch featuring two contact sleeves inside a jacket with a displaceable intermediate contact body of metal granulate, a preloaded compression spring biasing the contact body in the direction of contact interruption, a normally solid trigger body of fusible material holding the contact body in its normal, sleeve-bridging position, against the spring bias, until, at a critical temperature level, the trigger body yields to the spring which moves the contact body and breaks contact in the switch.
    Type: Grant
    Filed: September 8, 1975
    Date of Patent: May 24, 1977
    Assignee: Firma Microtherm GmbH
    Inventor: Gerhard Schwarz