×

Fire alarm system

  • US 4,553,138 A
  • Filed: 03/23/1982
  • Issued: 11/12/1985
  • Est. Priority Date: 09/28/1981
  • Status: Expired due to Fees
First Claim
Patent Images

1. A fire alarm system comprising a first unit mounted on a wall or ceiling surface of a room of a building and a second unit located more conveniently to an occupant of the room,said first unit comprising fire sensing means, acoustic alarm means controlled by said fire sensing means, and power supply means for supplying power to said fire sensing means and said alarm means, andsaid second unit comprising a switch box, an on-off control switch in said switch box and electrically connected with said alarm means of said first unit additionally to control said alarm means, and vibration means provided in said switchbox and also directly actuated by said control switch, said vibration means comprising a vibration type buzzer mounted in said switch box and operable to produce an audible alarm signal and to vibrate said switch box to provide a tactile signal when actuated.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×