Coin telephone protection device

Details Coin telephone protection device Coin telephone protection device

1997-11-04

1999-11-02

Chiang, Jack

Telephonic communications

Terminal accessory or auxiliary equipment

Protective structure

379437, 379145, H04M 100, H04M 1700

Patent

active

059784741

ABSTRACT:
A linkage couples the coin return door of a coin telephone instrument to a cam mounted in the coin return chute. When the coin return door is opened in the normal manner by a customer to retrieve coins from the coin return hopper, the cam closes a contact of a microswitch that completes a circuit. After a normal coin retrieval the door closes and the switch contact returns to open. Such momentary switch closures are considered normal. However, if foreign matter has been stuffed into the coin return hopper by a fraudulent user, the material will be engaged by a comb at the end of the cam, preventing the coin return door from closing normally. When the door is prevented from closing normally and remains open for more than a few moments, the switch remains actuated, keeping the circuit closed for longer than normal thereby signaling the signaling the telephone company that the phone has been tampered with.

REFERENCES:
patent: 5787158 (1998-07-01), Anello et al.

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