Patents Assigned to ADCO Venetian Blind Company
  • Alarm apparatus for movable barrier members
    Patent number: 4160972
    Abstract: A normally-open magnetic reed switch is mounted on the bottom of a venetian blind or similar barrier and a magnet is mounted in the window sill to hold the switch closed when the barrier is in its normal position. When closed, the switch shorts a timing capacitor in an associated alarm circuit. If the switch moves away from the magnet (thus allowing the switch to open) long enough for the timing capacitor to charge, an alarm signal is produced. Thus an alarm will not be produced by trivial movements of the barrier.
    Type: Grant
    Filed: May 18, 1978
    Date of Patent: July 10, 1979
    Assignee: ADCO Venetian Blind Company
    Inventors: Kenneth La Mell, Gerry Schneider