Patents Assigned to Hokuseki Sangyo Kabushiki Kaisha
  • Breakage detector having a conductive bent metallic leaf spring therein
    Patent number: 4122445
    Abstract: The detector is primarily for detecting glass breakage and is constructed as a sensing element for detecting the breakage and generating an alarm signal. The detector generally comprises a thin cylindrical casing including a first leaf spring and a second leaf spring having a plurality identations or bends thereon for absorbing noise signals below a breakage frequency signal when a glass panel is actually broken or cut.
    Type: Grant
    Filed: June 18, 1976
    Date of Patent: October 24, 1978
    Assignee: Hokuseki Sangyo Kabushiki Kaisha
    Inventor: Kohji Orita