Abstract A security system for use in a motor vehicle and particularly one carrying valuable cargo operates to permit normal operation of the vehicle over a predetermined time interval when a proper code has been entered into a code logic means of the system, and subsequently inhibits normal operation of the vehicle such as by locking the brakes of the vehicle after the termination of the predetermined time interval unless a second proper code, preferably different from the previously entered code, has been entered into the code logic means of the system. In a preferred embodiment of the invention the system includes a master timer defining a first time interval the length of which may be dependent upon a portion of the entered code, a warning timer responsive to the termination of the first time interval and defining a second time interval, preferably shorter than the first time interval, and an emergency timer responsive to the termination of the second time interval and operation of an emergency switch for enabling continued operation of the vehicle for a third time interval comparable to the second time interval. The system may also include an electromechanical lock located inside the cargo compartment and second code logic means responsive to entry of a second proper code for opening the lock.
A system for preventing the theft of a vehicle comprising; means for receiving at least one code at a time of a plurality of different preselected codes, timer means including means for establishing a predetermined time interval of the timer means, said timer means being responsive to receipt of a proper code for commencing said predetermined time interval, and means responsive to termination of the predetermined time interval for inhibiting the movement of the vehicle, whereby receipt of a second proper code prior to the termination of the predetermined time interval permits further movement of the vehicle.
Claim 2
Independent Claim
97 words
A system for preventing the theft of a vehicle comprising; means for receiving at least one code at a time of a plurality of different preselected codes, timer means including means for establishing a predetermined time interval of the timer means, said timer means being responsive to receipt of a proper code for commencing said predetermined time interval, and means responsive to termination of the predetermined time interval for inhibiting the movement of the vehicle, whereby receipt of a second proper code prior to the termination of the predetermined time interval permits further movement of the vehicle.
Claim 3
Dependent Claim
18 words
The system of claim 1 wherein said timer means includes a master timer defining a first time period.
Claim 4
Dependent Claim
25 words
The system of claim 2 comprising a warning timer responsive to termination of the first time period and including means establishing a second time period.
Claim 5
Dependent Claim
17 words
The system of claim 3 wherein said second time period is shorter than said first time period.
Claim 6
Dependent Claim
13 words
The system of claim 2 including means for varying the first time period.
Claim 7
Dependent Claim
43 words
The system of claim 3 further comprising an emergency switch and an emergency timer coupled from said warning timer and responsive to the termination of the second time period and operation of the emergency switch and including means defining a third time period.
Claim 8
Dependent Claim
16 words
The system of claim 6 wherein said second and third time periods are of comparable duration.
Claim 9
Dependent Claim
20 words
The system of claim 3 comprising a flasher coupled to said warning timer and operable during said second time period.