Door security system
US5923249A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Jul 11, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An optional security system for monitoring door opening is designed to be plugged into the main board of a slot machine without any change of hardware or addition of extra switches. This security system allows time stamping of any access to the machine interior and will operate while the machine is powered down. Standard and optional security is designed so that when the optional security module is added it can share the same sensors as the standard system. The normal security system does not prevent the security module functioning when the power is off. Ideally, a security module can be plugged into a machine and take over or add the new security features. The isolation between the main board and the security system is achieved by the use of schottky diodes. When operating from battery power, the security subsystem remains in a low power drain "sleep" state for the majority of the time, "waking up" periodically to check the door switches and then going to sleep again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.