Vehicle security alarm
First Claim
1. A motorized vehicle having an ignition switch, a vehicle battery, and an ignition system WHEREIN THE IMPROVEMENT COMPRISESalarm emitting means capable of being turned on;
- means for disabling said alarm emitting means at least when said ignition switch is on;
sensing means for turning on said alarm emitting means when said ignition switch is off when said vehicle is disturbed; and
means for blocking said disabling means when said battery is electrically connected to said ignition system but when said ignition switch is off.
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Accused Products
Abstract
A motor vehicle antitheft alarm provides complex sounds, is disabled in normal use of the vehicle, and is resistant to "hotwiring" of the ignition notwithstanding. Unauthorized motion of the vehicle causes a disturbance sensor to activate the alarm circuit. Qualitatively different alarm sounds are provided in response to repeated disturbances as compared with isolated ones. When the ignition is turned on in normal use, a first voltage condition is provided to disable the alarm apparatus. After the ignition is turned off a short time of disabling is provided to permit the user to leave the vehicle before the alarm can be activated. An anti-hotwiring turn-on circuit associated with the ignition switch provides a second voltage condition, or allows same, blocking the first voltage condition from occurring during hotwiring. A voltage-sensitive circuit sets off the alarm when the second voltage condition occurs, deterring hotwiring. The alarm automatically turns off after a period of time, conserving battery power and affording owner convenience. When the vehicle is a motorcycle or moped, the center stand is provided with a switch for preventing alarm sounds during normal maintenance with the center stand down. A backup battery and other circuit-protecting measures are providable in the alarm unit which is located in a secure part of the vehicle.
65 Citations
24 Claims
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1. A motorized vehicle having an ignition switch, a vehicle battery, and an ignition system WHEREIN THE IMPROVEMENT COMPRISES
alarm emitting means capable of being turned on; -
means for disabling said alarm emitting means at least when said ignition switch is on; sensing means for turning on said alarm emitting means when said ignition switch is off when said vehicle is disturbed; and means for blocking said disabling means when said battery is electrically connected to said ignition system but when said ignition switch is off. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Security alarm apparatus for use on a motorized vehicle having an ignition switch and an ignition system, said security alarm apparatus comprising
alarm emitting means; -
disturbance detection means for activating said alarm emitting means; means for disabling said alarm emitting means when said ignition switch is on, said disabling means having an input for being connected to said ignition switch; and means for unidirectional conduction of current between said ignition switch and said ignition system to energize said ignition system when said ignition switch is on, said unidirectional conduction means having a first lead connected to said input of said disabling means and a second lead for being connected to said ignition system so that said unidirectional conduction means is connected between said ignition switch and said ignition system. - View Dependent Claims (8, 9, 10, 11)
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12. Security alarm apparatus for use on a vehicle, said security alarm apparatus comprising
means for detecting at least a first disturbance and a second identical disturbance occurring to the vehicle; - and
means for providing a continuous sound of limited duration as a first alarm response to said first disturbance to the vehicle and subsequently providing a succession of sounds of another limited duration after the continuous sound as a second alarm response to said second identical disturbance to the vehicle, said providing means including means responsive to the detecting means for producing the first alarm response to said first disturbance to the vehicle, means for producing an electrical signal in response to said first disturbance to the vehicle and lasting longer than the first alarm response sound, and means responsive to the detecting means and said electrical signal producing means for producing the second alarm response after the first alarm response if the electrical signal is present and the second disturbance to the vehicle occurs. - View Dependent Claims (13)
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14. Security alarm apparatus for use on a vehicle having an ignition system with an ignition switch, said security alarm apparatus comprising
means for detecting at least a first disturbance and a second identical disturbance occurring to said vehicle; -
means for providing a first alarm response to said first disturbance and subsequently providing a second alarm response to said second identical disturbance, said second alarm response being qualitatively different from said first alarm response; means for disabling said apparatus from providing any alarm response when the ignition switch of the vehicle is on; and means for blocking said disabling means when the ignition system of the vehicle is energized but the ignition switch is off. - View Dependent Claims (22, 23, 24)
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15. Security system for use in a motorized vehicle having an ignition system and a vehicle battery having a battery voltage, said security system comprising
turn-on means for (A) permitting said battery voltage to be conducted to said ignition system when said turn-on means is on, (B) providing a modified battery voltage to a security voltage output of said turn-on means whenever said turn-on means is on, but (C) blocking the voltage at said security voltage output from being said modified battery voltage when said turn-on means is off and said ignition system is energized as by hotwiring to said ignition system, and (D) allowing the voltage at said security voltage output to become a second voltage condition distinct from said modified battery voltage when said turn-on means is off and said security voltage output is energized as by hotwiring; -
alarm emitting means capable of being caused to emit an alarm signal; sensing means for causing said alarm emitting means to emit an alarm signal when said vehicle is physically disturbed; and means for (1) disabling said alarm emitting means in response to said modified battery voltage whenever said modified battery voltage appears at said security voltage output and (2) whenever the voltage at said security voltage output becomes said second voltage condition, causing said alarm emitting means to emit an alarm signal. - View Dependent Claims (16, 17, 18)
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19. Article for use in a motorized vehicle security system, said article comprising
alarm emitting means capable of being caused to emit an alarm signal; -
sensing means for causing said alarm emitting means to emit an alarm signal when said vehicle is physically disturbed; means for disabling said alarm emitting means in response to a first voltage condition of an ignition switch conductor indicating that said motorized vehicle has its ignition switch on, thereby to keep said alarm emitting means from emitting an alarm signal even when said vehicle is physically disturbed; and means for responding to a second distinct nonzero voltage condition of said ignition switch conductor so as to block said second voltage condition from being received by said disabling means and so as to cause said alarm emitting means to emit an alarm signal, whereby hotwiring of said vehicle is made detectable.
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20. Security system for use in a motorized vehicle having an ignition system and a vehicle battery having a battery voltage, said security system comprising
turn-on means for (A) permitting said battery voltage to be conducted to said ignition system when said turn-on means is on, (B) providing a first voltage condition to a security voltage output of said turn-on means whenever said turn-on means is on, but (C) blocking the voltage at said security voltage output from being said first voltage condition when said turn-on means is off and said ignition system is energized as by hotwiring to said ignition system, and (D) allowing the voltage at said security voltage output to become a second voltage condition distinct from said first voltage condition when said turn-on means is off and hotwiring occurs; -
alarm emitting means capable of being caused to emit an alarm signal; and voltage-sensitive means for causing said alarm emitting means to emit an alarm signal in response to the voltage at said security voltage output only when the voltage at said security voltage output become said second voltage condition. - View Dependent Claims (21)
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Specification