초록 ▼

A circuit for inhibiting the operation of an engine after the engine has functioned for a specific period of time. The circuit basically includes a timing network, a concealed switch, a timing disable network, an audible alarm, and relay. When the engine is started by an unauthorized operator, who i

A circuit for inhibiting the operation of an engine after the engine has functioned for a specific period of time. The circuit basically includes a timing network, a concealed switch, a timing disable network, an audible alarm, and relay. When the engine is started by an unauthorized operator, who is unaware of the concealed switch, the engine will operate in the normal manner upon closure of the ignition switch. Closure of the ignition switch applies battery power to the timing circuit which starts to “time out”. Subsequently, when the timing circuit “times out”, battery current flows through the relay coil, its contacts close to thereby connect a capacitor across the ignition points of the engine. The engine is thereby disabled after the vehicle has travelled a relatively short distance. An authorized user of the vehicle, knowing the existence and location of the concealed switch momentarily closes the switch after the engine has been started but prior to completion of the time out cycle and thereby disables the timing network. This permits unrestricted operation of the vehicle. Since the concealed switch was only activated momentarily through a silicon controlled rectifier, the timing network will be automatically reset upon opening of the ignition switch.

대표청구항 ▼

An anti-theft device for an engine propelled vehicle wherein said vehicle includes an ignition switch connecting a source of electrical energy to an ignition coil and ignition points for delivering high voltage electrical energy from said ignition coil to a distributor, said device comprising: a fir

An anti-theft device for an engine propelled vehicle wherein said vehicle includes an ignition switch connecting a source of electrical energy to an ignition coil and ignition points for delivering high voltage electrical energy from said ignition coil to a distributor, said device comprising: a first bistable means having an engine operating position and an engine disabling position, said first bistable means normally assuming said operating position; a second bistable means capable of assuming a conducting state and a non-conducting state and connected to function said first bistable means to its disabling position when said second means assumes its conducting state; a timing network in circuit with said ignition switch to commence timing upon the closure of said ignition switch and having its output coupled to said second bistable means for causing said second bistable means to assume its conducting state at the termination of the timing period; a concealed switch means coupled to activate, an inhibit means, said inhibit means being connected to said first bistable means to prevent said first bistable means from assuming the disabling position upon operation of said concealed switch means.