Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-06-14
1998-05-19
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340571, 340551, 379145, 379451, G08B 1314
Patent
active
057541094
ABSTRACT:
A sensor that senses the absence of a high-magnetic permeable coin box (10) that, in its quiescent state, is mounted within a compartment (12) of a coin operated device, such as a pay telephone (14). The compartment has at least one interior surface (16). The sensor includes an electromagnetic switch (20) having two states (open circuit, closed circuit) that affect a signal to an output device (22) when the switch (20) is activated from one state to another. In preferred form, the switch (20) is a reed switch. A magnet (18) normally provides magnetic flux flow to the switch. When the magnetic flux flow is disrupted, the switch (20) changes from one state to another. The switch (20) and the magnet (18) are fixably-connected to at least one surface (16) of the compartment (12). The combination of the magnet (18) and the switch (20) are positioned within the compartment relative to the coin box (10), such that when the coin box (10) is in its quiescent state, the presence of the coin box disrupts the magnetic flux flow from the magnet (18) to the switch (20). In this quiescent state, the switch is in one state. When the coin box is removed, the magnetic flux flow is no longer disrupted and the switch changes to the other state. A signal is sent to the output device (22) from the switch (20) when the switch (20) changes state.
REFERENCES:
patent: 4123623 (1978-10-01), McElliott
patent: 4723118 (1988-02-01), Hooley et al.
patent: 4780704 (1988-10-01), Tommasini
patent: 4928299 (1990-05-01), Tansky et al.
patent: 5554833 (1996-09-01), Johnson
Bellamy Glenn D.
Foursum International, Inc.
Hofsass Jeffery
La Anh
Petrich Kathleen T.
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