Importance

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Abstract

A padlock with a built-in anti-theft alarm device that is comprised of a padlock mechanism consisting of a lock structure having a rotational locking pintle bar that is revolved a certain angle to achieve locking and unlocking, a cam suitably positioned at the center of the pintle bar, an electric switch that is actuated by the cam pushing against a switching device, an alarm circuit with an independent power supply and a vibration sensor device. The rotation of the pintle bar revolves the cam such that the lobe pushes against and closes the electric switch, which initiates the operation of the alarm circuit. The vibration sensor device triggers the alarm circuit to emit an alarm sound whenever abnormal vibration is detected. The alarm circuit has an independent power supply that is securely protected by the outer padlock case to prevent damage and power loss. The key head of the padlock mechanism has a two-position rotating lock setting that can be selectively locked or unlocked with or without setting the alarm circuit for operation to prevent the unwanted sounding of the alarm.

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First Claim