Code combination property alarm system
First Claim
1. A property protection alarm system for protecting property against unauthorized intrusion and the like comprising:
- sensing means for sensing an alarm condition such as any intrusion of the property, said sensing means including means for detecting movement through normal entrance to the property;
a local audible alarm;
an external alarm;
alarm energization means responsive to said sensing means for energizing said local audible alarm for a given alarm interval upon the occurrence of any intrusion of the property including an authorized intrusion through said normal entrance and energizing said external alarm only after a predetermined entrance delay period;
arming means connected to said alarm energization means for enabling an authorized user of said alarm system to arm and disarm said alarm energization means, said arming means including a numeric keyboard having a plurality of keys and a code combination logic circuit connected thereto for arming and disarming said alarm energization means in response to a predetermined numeric code entered in said numeric keyboard by actuation of selected ones of said keys, said code combination logic circuit including code timing means responsive to the actuation of the first of said selected ones of said keys associated with the predetermined numeric code for establishing a predetermined code interval in which all of the remaining ones of said selected ones of said keys associated with the predetermined numeric code must be actuated in order to arm or disarm said alarm energization means;
said alarm energization means including exit delay means actuated by said arming means for delaying only the arming of said alarm energization means by said arming means for a predetermined exit delay period to permit the authorized user of said alarm system to leave the property through said normal entrance without energizing either said local audible alarm or said external alarm, said alarm energization means further including entrance delay means connected to said external alarm for delaying energization of said external alarm for the predetermined entrance delay period to permit the authorized user to enter the property through said normal entrance without energizing said external alarm and disarm said alarm system by actuating said arming means, said local audible alarm being immediately energized for a given alarm interval in response to any intrusion of the property including an authorized intrusion through said normal entrance.
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Accused Products
Abstract
A property protection alarm system is disclosed for protecting property against unauthorized intrusion and the like. The alarm system includes a numeric key board and a code combination logic circuit for arming an alarm energization circuit in response to the proper entry of a predetermined numeric code in the numeric keyboard. This predetermined code must be entered within a given period of time determined by the code combination logic circuit. In addition, the numeric key associated with the last digit of the predetermined code must be depressed for a given period of time as also determined by the code combination logic circuit. An exit delay circuit is connected to the output of the code combination logic circuit for delaying the arming of the alarm energization circuit in order to permit an authorized operator to leave the property without energizing the alarm. The alarm energization circuit is connected to a sensing circuit for sensing any intrusion of the property. The alarm energization circuit is capable of triggering a local alarm upon any intrusion of the property including an authorized intrusion. On the other hand, the alarm energization circuit includes an entrance delay circuit which delays the energization of an external alarm to enable an authorized user to disarm the alarm energization circuit by entering the predetermined numeric code in the numeric keyboard before the expiration of the time period provided by the entrance delay circuit.
53 Citations
10 Claims
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1. A property protection alarm system for protecting property against unauthorized intrusion and the like comprising:
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sensing means for sensing an alarm condition such as any intrusion of the property, said sensing means including means for detecting movement through normal entrance to the property; a local audible alarm; an external alarm; alarm energization means responsive to said sensing means for energizing said local audible alarm for a given alarm interval upon the occurrence of any intrusion of the property including an authorized intrusion through said normal entrance and energizing said external alarm only after a predetermined entrance delay period; arming means connected to said alarm energization means for enabling an authorized user of said alarm system to arm and disarm said alarm energization means, said arming means including a numeric keyboard having a plurality of keys and a code combination logic circuit connected thereto for arming and disarming said alarm energization means in response to a predetermined numeric code entered in said numeric keyboard by actuation of selected ones of said keys, said code combination logic circuit including code timing means responsive to the actuation of the first of said selected ones of said keys associated with the predetermined numeric code for establishing a predetermined code interval in which all of the remaining ones of said selected ones of said keys associated with the predetermined numeric code must be actuated in order to arm or disarm said alarm energization means; said alarm energization means including exit delay means actuated by said arming means for delaying only the arming of said alarm energization means by said arming means for a predetermined exit delay period to permit the authorized user of said alarm system to leave the property through said normal entrance without energizing either said local audible alarm or said external alarm, said alarm energization means further including entrance delay means connected to said external alarm for delaying energization of said external alarm for the predetermined entrance delay period to permit the authorized user to enter the property through said normal entrance without energizing said external alarm and disarm said alarm system by actuating said arming means, said local audible alarm being immediately energized for a given alarm interval in response to any intrusion of the property including an authorized intrusion through said normal entrance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification