Vehicle anti-theft alarm circuit
US3967239A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1974 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Nov 15, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2225/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An anti-theft system for a motor vehicle which includes an ARM ENABLE latch and an ARM latch which establish a circuit arming condition in response to movement of a key operated switch from a neutral to an arming position. An ALARM latch is responsive to a plurality of sensor switches which in turn are responsive to whether a compartment of the vehicle is open or closed. If a compartment is opened after the arming condition has been established the ALARM latch causes the vehicle horn to be periodically energized for a predetermined interval of time. Delay means are provided for preventing a change of state of the various latches for a predetermined interval of time after actuation of the switch controlled input to the latch so as to prevent inadvertent triggering of the latch circuit. Indicator means are provided for detecting a malfunction in the system which would prevent the circuit arming condition from being established.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.