Patents Assigned to Klaxon
  • Acoustic alarm device with sound attenuator
    Patent number: 4000715
    Abstract: An electromagnetic acoustic alarm device including a casing formed in part by a bell-shaped wall which defines together with a membrane secured to the casing by means of the bell-shaped wall a chamber, the front portion of the wall provided with at least one opening and a rotatable external plate of the same configuration as the wall front portion having at least one opening for registration to a selected extent with the wall opening so as to adjustably attenuate the high frequency sound component of the device.
    Type: Grant
    Filed: May 29, 1975
    Date of Patent: January 4, 1977
    Assignee: Klaxon
    Inventor: Bertrand A. Warnod