초록 ▼

An anti-theft alarm device for household items is disclosed. The device employs a motion sensor unit subject to magnetic control such that the alarm may be disabled, set to go off or reset after being sounded. The magnetic control is applied by a magnetic probe to a conductive ball sensor normally m

An anti-theft alarm device for household items is disclosed. The device employs a motion sensor unit subject to magnetic control such that the alarm may be disabled, set to go off or reset after being sounded. The magnetic control is applied by a magnetic probe to a conductive ball sensor normally maintained on a nonconductive area between conducting surfaces of opposite polarity. When magnetic attraction is removed the ball is free to respond to motion and complete an alarm circuit. A mounting casing is provided, which may be used to mount the motion sensing unit and alarm circuit in a compact apparatus. Additional mounting hardware is provided to enable mounting the motion sensing unit on angulated or curved surfaces. The magnetic control functions may be set by radio control.

대표청구항 ▼

An apparatus for triggering an alarm in response to motion, the apparatus comprrising: a housing; a non-conductive area in the housing, the non-conductive area including a recess; a conductive ball incorporating material responsive to a magnetic field force, the ball dimensioned to interface with th

An apparatus for triggering an alarm in response to motion, the apparatus comprrising: a housing; a non-conductive area in the housing, the non-conductive area including a recess; a conductive ball incorporating material responsive to a magnetic field force, the ball dimensioned to interface with the recess and normally held therein in a resting position by the force of gravity, the ball capable of being at least partially dislodged from the recess in response to a movement of the housing; at least a singular first contact element disposed substantially horizontally within the housing; a second substantially circular contact element surrounding the ball without being in contact therewith when the ball is held in the recess, the first and second contact elements comprising terminals of an open electric circuit, and dimensioned to contact the ball when the ball is dislodged from the resting position whereby the ball closes the electric circuit and activates the alarm; a magnet operatively positioned within the housing outside of the substantially circular second contact element, the magnet having insufficient field force to dislodge the ball from the recess but having sufficient field force to retain the ball in contact with the first and second contact elements after the ball has come into contact with the first and second contact elements, and control means mounted to the housing for providing options for retaining the ball in the resting position regardless of the movement of the housing, for releasing the ball to rest in the resting position wherein it is responsive to the movement of the housing, and for removing the ball from contact with the first and second contact elements and returning it into the resting position.