Abstract: A burglar alarm provided with a housing which contains a bell assembly and a battery compartment connected in series with a switch assembly having a linearly movable element which can be displaced a predetermined threshold distance by a chain extending to a magnet temporarily joined to a metal bracket attached to a movable surface. The switch assembly contains a pivoted contact which moves against a fixed contact when the linearly movable element is displaced a predetermined distance, and remains there regardless of the subsequent position of the linearly moveable element until a button operationally connected to the switch assembly is moved to the "off" position. The bell assembly includes a motor having a clanger support mounted on its shaft, the clangers being loosely mounted on the clanger support so that they can strike the bell without impeding the rotation of the motor.
Abstract: A self-energized alarm device which can signal unauthorized entry such as through a doorway or window. The alarm device is preferably energized by a spring mechanism and utilizes a bell which is activated by means of an arm member and vibrated by an escapement. A standard slide bolt door latch is incorporated in the alarm device as a means for actuating the arm member.
Type:
Grant
Filed:
June 29, 1977
Date of Patent:
August 29, 1978
Inventors:
Clarence W. Jorgensen, deceased, by Elva M. Jorgensen, executrix