Truck security system
First Claim
30. A security system for a truck having a cargo section and a door to access said cargo section, said door having an open and a closed condition comprising:
- control means;
sensing means to detect the condition of said cargo door and convey a signal representative of the condition of said door to control means;
means for receiving RF signals and for conveying said received RF signals to said control means;
alarm means situated on said truck; and
RF transmission means able to be carried by a person, said RF transmission means having an RF output range corresponding to a distance, wherein said output range is continuously adjustable between minimum and a maximum distance, and wherein said RF transmission means continuously transmits an RF signal in groups of pulses having a regular interval between said groups of pulses, said RF signal being receivable by said RF receiving means only when said RF signal receiving means is within said minimum and maximum distance of said RF transmission means, said control means further comprising means to process said RF signal according to the condition of said door, and timing means to determine if the interval of time between said groups of pulses in said RF signal is within a first preset value, wherein said alarm means emits an audible alarm when said interval of time exceeds said first preset value, and the condition of said door is open.
1 Assignment
0 Petitions
Accused Products
Abstract
A security system is provided for a truck having at least one cargo door. The system emits an audible alarm when a cargo door is open and a driver or other person working on the truck goes beyond a defined distance, generally the immediate vicinity, from the truck exposing cargo to possible theft. In a truck having more than one cargo door an alarm is sounded if more than one door is open simultaneously. If an attempt is made to start the engine with a door open, the system sounds an alarm in the cab and ignition is prevented. The system includes sensing means to detect if cargo doors are opened or closed, control logic circuitry and a clock, a RF signal receiver, an ignition cut-off, an audible alarm and a battery to independently power the security system, all of which are situated on the truck. The system also includes portable a portable RF transmitter carried by a person normally doing work on the truck. The control circuit processes signals from a sensor indicating if a cargo door is opened or closed. A clock in the control circuit measures the time interval between successive received signals from the RF transmitter and determines if the interval falls within a preset interval of time. If the reception interval exceeds the preset interval at the same time a door is open, the control means causes an alarm to sound.
23 Citations
61 Claims
-
30. A security system for a truck having a cargo section and a door to access said cargo section, said door having an open and a closed condition comprising:
- control means;
sensing means to detect the condition of said cargo door and convey a signal representative of the condition of said door to control means;
means for receiving RF signals and for conveying said received RF signals to said control means;
alarm means situated on said truck; and
RF transmission means able to be carried by a person, said RF transmission means having an RF output range corresponding to a distance, wherein said output range is continuously adjustable between minimum and a maximum distance, and wherein said RF transmission means continuously transmits an RF signal in groups of pulses having a regular interval between said groups of pulses, said RF signal being receivable by said RF receiving means only when said RF signal receiving means is within said minimum and maximum distance of said RF transmission means, said control means further comprising means to process said RF signal according to the condition of said door, and timing means to determine if the interval of time between said groups of pulses in said RF signal is within a first preset value, wherein said alarm means emits an audible alarm when said interval of time exceeds said first preset value, and the condition of said door is open. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 39, 40, 41, 42, 43, 44, 45, 46)
- control means;
-
35-1. The security system according to claim 30 wherein said RF transmission means further comprises means to immediately transmit said pulsed signal with maximum output range.
-
47. A security system for a truck having a cargo section and a door to access said cargo section, said door having an open and a closed condition, a cabin, an engine and an ignition system to start said engine, said system comprising:
- control means;
means for sensing the condition of said cargo door and for conveying a signal representative of the condition of said door to said control means;
means for sensing the activation of said ignition system and for conveying a signal to said control means indicating that said ignition system is activated;
ignition system disabling means;
alarm means situated in said cabin, said control means comprising means for processing said representative signal received from said door condition sensing means, for causing said alarm means to emit an alarm, and for causing said ignition system disabling means to disable said ignition system, when said door is open and said ignition means is activated. - View Dependent Claims (48, 49, 50, 51)
- control means;
-
52. A security system for a truck having a cargo section and a first and a second door to access said cargo section, with each said door having an open and a closed condition, comprising:
- control means;
means for sensing the condition of each of said doors and conveying signals representative of the condition of each of said doors to said control means;
alarm means situated on said truck;
said control means comprising means for processing said received signals from said sensing means and means for causing said alarm means to emit an alarm when both of said doors are open. - View Dependent Claims (53, 54, 55)
- control means;
-
56. Control apparatus for a truck security system, the truck being of the type having at least one cargo door, an engine and an engine ignition system, said control apparatus being situated on said truck and powered by means independent of the engine, said apparatus comprising:
- means for sensing whether each cargo door is open or closed and for generating a signal representative of the condition of each cargo door;
alarm means;
RF receiver means;
means connected to said RF signal receiving means for measuring the interval of time between the receipt of successive RF signals by said RF signal receiving means and for generating a signal if said time interval exceeds a preset value, means for sensing the activation of said ignition system and for generating a signal representative thereof;
control means for generating an alarm means energizing signal based on said signals generated by said cargo door sensor means, said RF signal receiving means, said timing means and said ignition system activation sensing means, and means for activating said alarm means in response to said alarm means activating signal;
means for inactivating said engine ignition system in response to said alarm means activating signal; and
means for enabling and disabling said means for generating an alarm means energizing signal. - View Dependent Claims (57, 58, 59, 60, 61)
- means for sensing whether each cargo door is open or closed and for generating a signal representative of the condition of each cargo door;
Specification