Abstract: Provided is a temperature-sensitive pellet-type thermal fuse having excellent reliability including an insulation property after having operated. The fuse includes, in a tubular case with high electrical conductivity and high thermal conductivity, at least a temperature-sensitive pellet being capable of melting and softening at a specific temperature, a strong compression spring pressing the temperature-sensitive pellet, an insulating lid body closing an end portion of an opening of the tubular case, a weak compression spring being in contact with the insulating lid body, a first lead having an inner end penetrating the insulating lid body as a stationary contact, and a movable contact electrically connected to the first lead and the tubular case, and further includes a second lead disposed at an end of the tubular case.

Abstract: The temperature sensitive pellet type thermal fuse includes: a conductive envelope having an opening at a first end; a temperature sensitive device housed inside the envelope; a first lead which is installed in the opening of the envelope and has a fixed contact; a second lead connected to a second end of the envelope; a movable contact housed in the envelope; and a weak compression spring housed in the envelope. The temperature sensitive device includes a cylindrical case having an open end which may be arranged at the side of the first lead, a temperature sensitive material housed in the cylindrical case, and a strong compression spring configured to press against the temperature sensitive material.

Abstract: The temperature sensitive pellet type thermal fuse includes: a conductive envelope having an opening at a first end; a temperature sensitive device housed inside the envelope; a first lead which is installed in the opening of the envelope and has a fixed contact; a second lead connected to a second end of the envelope; a movable contact housed in the envelope; and a weak compression spring housed in the envelope. The temperature sensitive device includes a cylindrical case having an open end which may be arranged at the side of the first lead, a temperature sensitive material housed in the cylindrical case, and a strong compression spring configured to press against the temperature sensitive material.

Abstract: The present invention provides an electronic exchange capable of certainly making forwarding to a telephone at the forwarding destination. When an electronic exchange receives a forwarding acknowledgement signal “Facility message” from an electronic exchange, if a telephone to be called is idle, the electronic exchange makes the telephone shift to the receiving standby state for the forwarding, turns on an extension button of the telephone and sets the call transmission and the call reception except for the forwarding to be impossible.

Abstract: The present invention relates to a system (FDD) for driving such a magnetic disc as a floppy disc, in which, in a stand-by mode where recording or reproducing operation is not carried out, a magnetic head is moved to a track position in the vicinity of the innermost peripheral part of the disc or the disc is intermittently rotably driven so that an adsorbent phenomenon can be prevented from taking place between the magnetic head and the disc and even in the case of occurrence of such a adsorbent phenomenon, the magnetic head or disc can be easily released from such adsorbent binding, thus preventing any destruction of information recorded on the disc.

Abstract: A telephone system which allows external releasing of a holding state set by a holding operation of a telephone set. A signal receiving circuit of the system receives a holding-state releasing signal such as a DTMF signal or the like sent from a central office line to release the hold state of the telephone set on the basis of an output of the circuit.