GB2179482A - A two-step alarm disarming device - Google Patents

A two-step alarm disarming device Download PDF

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Publication number
GB2179482A
GB2179482A GB8520787A GB8520787A GB2179482A GB 2179482 A GB2179482 A GB 2179482A GB 8520787 A GB8520787 A GB 8520787A GB 8520787 A GB8520787 A GB 8520787A GB 2179482 A GB2179482 A GB 2179482A
Authority
GB
United Kingdom
Prior art keywords
alarm
disarming
circuit
ignition
disarm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8520787A
Other versions
GB8520787D0 (en
GB2179482B (en
Inventor
Hwang Shih-Ming
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8520787A priority Critical patent/GB2179482B/en
Publication of GB8520787D0 publication Critical patent/GB8520787D0/en
Publication of GB2179482A publication Critical patent/GB2179482A/en
Priority to US07/057,632 priority patent/US4980666A/en
Application granted granted Critical
Publication of GB2179482B publication Critical patent/GB2179482B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/008—Alarm setting and unsetting, i.e. arming or disarming of the security system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/1003—Alarm systems characterised by arm or disarm features

Abstract

In an alarm for an enclosed space (eg a vehicle theft alarm) an externally accessible keyswitch (or the like) achieves temporary disarming to allow an authorised person sufficient access to an internal arming/disarming arrangement. The externally accessible device may be remotely actuable (eg by radio). The internal device may be associated with the ignition switch. <IMAGE>

Description

SPECIFICATION A two-step alarm disarming device with automatic rearming feature This invention relates to Alarm Disarming Device, in particular for Two-Step Alarm Disarming Device with Automatic Rearming Feature.
Generally, an automobile is equipped with a burglar alarm to prevent instrusion by a burglar. Both active and passive type burglar alarms have the following defects: (1) The burglar alarm must be turned on when the user is going to leave his car, but it may be left off due to user negligence, negating its function; (2) No provision exists for testing the functioning of the alarm and its circuits; (3) The user has to quickly leave the car after turning off the alarm since the time delay is very short; and (4) The user may prefer not to test the alarm since it is very noisy.
The inventor applied for a patent for the invention "Burglar Alarm with Re-entry Feature" on March 29, 1983 (Serial No.
480,124). On April 17, 1985, the patent was approved by the U.S. Patent Office. The said invention is characterized by the installation of sensors in the doors, hood, and trunk of a car. An exit delay period will begin when the last door is closed. Within this time period the alarm may be temporarily disarmed by again opening a door or the hood or trunk. Simultaneous with the closing of the last door a "chirp" will sound to inform the user that the doors have been properly closed, the alarm is functioning properly, and the exit delay period has begun. Once the exit delay period has expired, the alarn will be triggered by opening a door, hood, or trunk. Such an alarm increases the user's feeling of security, and is very convenient to use.
Currently, many automobile burglar alarms are operated by radio frequency, i.e., a radio frequency transmitter transmits a certain signal to disarm the alarm. A defect of most RF disarming devices is that an armed burglar alarm may be disarmed by external radio frequency signals and thus lose intended protective function. The present invention eliminates these defects, and can rearm an alarm automatically as well as disarm an alarm in two steps.
The said invention is an alarm disarming device which is characterized by a rearming circuit and a two-step alarm disarming circuit which temporarily disarms the alarm in the first step and permanently disarms the alarm in the second step. It can rearm itself after a preset time even if the alarm has not been triggered but has been interfered with by external radio frequency signals.
An embodiment of alarm disarming device according to this invention is described by way of example, with reference to drawings in which: Figure 1 is a block diagram of the present invention; and Figure 2 is a circuit diagram for a preferred embodiment of the present invention.
(1) Sensor input buffer circuit (2) Temporary alarm disarming circuit (3) External key switch buffer circuit (4) Ignition switch buffer circuit (5) Two-step alarm disarming circuit (6) Flip-flop IC (7) Buffer circuit (21) Sensor signal buffer (22) Automatic reset timer and alarm amplifier (23 External key switch buffer (24) Ignition switch buffer (25) Flip-flop (26 Speaker Fig. 1 is a block diagram of the invention.
As shown in the drawing, the invention uses sensors installed in the car doors, hood, and trunk to detect their opening or closing. Signals from such sensors enter a buffer circuit (1) and then a temporary alarm suppression circuit (2).
Furthermore, the invention has an external key switch buffer circuit (3) which is used to disarm an alarm by radio transmitter or by key lock switch and an ignition buffer circuit (4) controlled by the ignition. The external key switch and ignition switch inputs comprise the two-step alarm disarming circuit (5). In the first step, a radio transmitter is used to transmitter is used to disarm the alarm temporarily then opening the car door. If the door is not opened within a present period, the circuit will re-arm, and the radio transmitter must be used again to disarm the alarm temporarily in order to open the door. In the second step, i.e., after opening the door, the car ignition must be turned on to disarm the alarm permanently. The two-step disarming circuit refers to a flip-flop IC (6) which is used to lock the temporary disarm singal.There is a timer circuit composed of R2, R3, and C2 which sets a time limit for opening a car door after the alarm has been temporarily disarmed in the first setp. That is, for a certain preset period after activating the radio transmitter, a buffer circuit (7) gives a singal input to the temporary alarm suppression circuit (2) to disarm the alarm temporarily, and then as the preset time expires, automatically rearms to prevent accidental permanent disarming of the alarm by an exterior radio signal.
Only after temporarily disarming the alarm and opening the car door in the first step, and turning on the car ignition in the second step, will the alarm be permanently disarmed.
Therefore, external radio singals may disarm the alarm temporarily (first step disarming), but cannot disarm the alarm permanently (second step disarming). The alarm will automati cally re-arm at a preset time after the alarm is temporarily disarmed in the first step. Therefore, the invention is free from any interference due to user negligence or external forces, and can allow a burglar alarm to function at its optimum effectiveness.
Fig. 2 is a circuit diagram for another embodiment of the invention. The N.O. INPUT and N.C. INPUT are sensor signal input buffers (21) installed in the car doors, hood, or trunk.
The external key lock switch input is an external key lock switch buffer (23) for receiving signals from a radio transmitter in order to remotely disarm an alarm temporarily. The ignition and ignition buffer (24) are for completely disarming the alarm after the said temporary disarming through the external key switch. Therefore, no external radio frequency signal can perform the two-step alarm disarming. When the car doors, hood, and trunk are closed, point "b" in Fig. 2 is in the logic "1" state. If the ignition has been turned on, point "a" is in the logic "1" state, and point "d" in IC22 is also in the logic "1" state. Then, IC22 starts the automatic reset timer and the alarm amplifier circuit (22) so that no false alarm will be fiven during acceleration.As soon as the car is stopped and the ignition is turned off, the output point "b" in IC23 is in the logic "1" state, and point "c" in IC22 is in the logic "1" state, too C2, then provides positive potential to D2, and resets IC22. After the car door is opened, the output "b" of IC22 changes to the logic "0" state, the input of IC2, is in the logic "0, 0" state, its output is in the logic "1" state, and IC2, is reset. After closing the last car door, if the car door is opened again within a preset time, the output at point "f" of IC22 is in the logic "1" state, and it starts the automatic reset timer and the alarm amplifier circuit (22) so that it will not trigger the alarm. If a car door or hood or trunk is opened again after the preset time, the alarm will sound. In this way, the purpose of the alarm is achieved. As soon as the alarm is temporarily disarmed by the radio transmitter (or other external radio frequency), R22, R24, and C22 set the timer for automatic rearming. After opening the car door in the first step and turning on the ignition in the second step, the alarm is completely disarmed. The disarming at the second step uses the ignition, via D21, IC2" D22 and IC22, to di sarm the alarm completely. The invention is indeed an ideal alarm disarming device which will not be affected by any external interfer ence or user negligence.

Claims (4)

1. The two-step alarm disarming device with automatic rearming is comprised of: -an automatic rearming circuit which auto matically rearms the alarm after a preset time following temporary alarm disarming for reentry into the vehicle; and -a two -step alarm disarming circuit which includes temporary alarm disarming by a radio transmitter in the first step and permanent alarm disarming by turning on the ignition after car door opening in the second step.
2. A two-step alarm disarming device with automatic rearming as in Claim 1 wherein the automatic rearming circuit uses the two-step alarm disarming circuit together with IC6, R2, R2, C2, and buffer curcuits to rearm the alarm following temporary disarming at a time preset by R2, R2, and C2.
3. A two-step alarm disarming device with automatic rearming as in Claim 1 wherein the two-step alarm disarming circuit applies a signal from a radio transmitter corresponding to its receiver to disarm an alarm temporarily via an external key switch buffer circuit. The user can then open a car door and enter the car to turn on the ignition to permanently disarm the alarm via the ignition buffer circuit in conjunction with D21, R2, and the flip-flop IC.
4. A two-step alarm disarming device with automatic rearming as herein described with reference to any of the drawings.
GB8520787A 1985-07-26 1985-08-20 A two step alarm disarming device with automatic rearming feature Expired GB2179482B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8520787A GB2179482B (en) 1985-08-20 1985-08-20 A two step alarm disarming device with automatic rearming feature
US07/057,632 US4980666A (en) 1985-07-26 1987-06-03 Two-step alarm disarming device with automatic rearming feature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8520787A GB2179482B (en) 1985-08-20 1985-08-20 A two step alarm disarming device with automatic rearming feature

Publications (3)

Publication Number Publication Date
GB8520787D0 GB8520787D0 (en) 1985-09-25
GB2179482A true GB2179482A (en) 1987-03-04
GB2179482B GB2179482B (en) 1989-09-06

Family

ID=10584018

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8520787A Expired GB2179482B (en) 1985-07-26 1985-08-20 A two step alarm disarming device with automatic rearming feature

Country Status (1)

Country Link
GB (1) GB2179482B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0379505A1 (en) * 1987-09-14 1990-08-01 CALAPAI, Dino Placido Improvements in or relating to security device or alarm
SG83773A1 (en) * 1999-02-19 2001-10-16 Coselec Pte Ltd Electronic locking and monitoring system and method for arming or disarming intruder detection and/or status reporting systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1061382A (en) * 1962-08-24 1967-03-08 Alarmatic Devices Ltd Improvements in and relating to vehicle security systems
GB1404341A (en) * 1972-03-29 1975-08-28 Um Electrical Distributors Ltd Control device
GB1515973A (en) * 1975-12-23 1978-06-28 Guterman Paulette Detector devices in particular anti-theft detector device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1061382A (en) * 1962-08-24 1967-03-08 Alarmatic Devices Ltd Improvements in and relating to vehicle security systems
GB1404341A (en) * 1972-03-29 1975-08-28 Um Electrical Distributors Ltd Control device
GB1515973A (en) * 1975-12-23 1978-06-28 Guterman Paulette Detector devices in particular anti-theft detector device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0379505A1 (en) * 1987-09-14 1990-08-01 CALAPAI, Dino Placido Improvements in or relating to security device or alarm
EP0379505A4 (en) * 1987-09-14 1990-10-24 Dino Placido Calapai Improvements in or relating to security device or alarm
SG83773A1 (en) * 1999-02-19 2001-10-16 Coselec Pte Ltd Electronic locking and monitoring system and method for arming or disarming intruder detection and/or status reporting systems

Also Published As

Publication number Publication date
GB8520787D0 (en) 1985-09-25
GB2179482B (en) 1989-09-06

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20050819