Abrégé

A capacitive tamper detection system for safes, ATMs and cash cash storage devices deters theft and vandalism without damaging the safe or the currency contained within the safe. One or more sensor plates are mounted to the interior walls and/or door of the safe. The sensor plates are separated from the walls and/or door of the safe by a dielectric to form, along with the walls or door of the safe, one or more capacitors. The capacitors formed by the sensor plates and the walls and/or door of the safe are part of an RC circuit having a time constant that depends on the capacitance. The time constant of the RC circuit causes an astable multivibrator to oscillate at a particular frequency, outputting a frequency signal. Changes in the capacitance caused by damage to the walls and/or door of the safe changes the time constant of the RC circuit, which in turn changes the frequency signal. A control circuit monitors the frequency signal and initiates an alarm or other action when the variation on the frequency signal exceeds a threshold. The frequency signal may be easily monitored by converting the frequency signal to a voltage value.

Classes IPC  ?

• G08B 13/12 - Déclenchement mécanique par la rupture ou le dérangement de cordes ou de fils tendus
• G08B 13/26 - Déclenchement électrique par la proximité d'un intrus provoquant une variation dans la capacité ou l'inductance d'un circuit

Abrégé

A filter disk filters coins deposited into coin machines for counting, sorting, separating or processing coins to prevent the introduction or entry of foreign objects and debris into the coin machine, thus protecting and ensuring the proper functioning of the machine.

Classes IPC  ?

• G07D 9/00 - Comptage de pièces de monnaie; Manipulation de pièces de monnaie non prévue dans les autres groupes de la présente sous-classe
• G07D 3/14 - Appareils mus sous l'action d'éléments détectant les pièces de monnaie
• G07D 3/16 - Tri, selon leur valeur, de pièces de monnaie en vrac combiné au comptage de pièces de monnaie