Single-stroke Bell Patents (Class 116/95)
Door knob (Class 116/96)
  • Burglar alarm
    Patent number: 4269136
    Abstract: A gong or bell attached to a door such that when a thief breaks open the door, a ball or like object having a rod extending therethrough and resting on a ledge which projects from the top of a frame for the door, falls along the rod as the ball or like object is pushed with the door out of a slot in the ledge and rings the gong or bell by striking it and a spring which prevents muffling of the sound.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: May 26, 1981
    Inventor: Michael D. Hill
  • Burglar alarm
    Patent number: 4203383
    Abstract: A gong or bell attached to a door such that when a thief breaks open the door, a ball or like object having a rod extending therethrough and resting on a ledge which projects from the top of a frame for the door, falls along the rod as the ball or like object is pushed with the door out of a slot in the ledge and rings the gong or bell by striking it.
    Type: Grant
    Filed: January 12, 1979
    Date of Patent: May 20, 1980
    Inventor: Michael D. Hill
  • Bell actuating mechanism
    Patent number: 4135474
    Abstract: In the combination of a spring driven motor having a winding shaft which rotates less than one complete revolution during the unwinding of the motor from a fully wound condition, escapement means for permitting the motor to unwind at a controlled rate and a bell to be struck immediately proximate to completion of unwinding of the motor, there is provided an improved bell actuating mechanism.
    Type: Grant
    Filed: September 15, 1977
    Date of Patent: January 23, 1979
    Inventor: Ruth Kaplan