Alarm device for automatic garage door
First Claim
1. An alarm device for an automatic garage door of a garage, comprisinga detecting circuit, which comprises at least a detector installed to said garage door, for outputting a single negative pulse signal when said detector detects an opening motion of said garage door;
- an alarm controlling circuit, which is electrically connected with said detecting circuit, for receiving said single negative pulse signal from said detecting circuit and producing a warning signal;
a "normal function" detecting circuit connecting to a garage door "normal operation" signal generating source which generates a "normal opening" signal to activate said "normal function" detecting circuit when said garage door is normally opened in a predetermined manner, said "normal opening" signal being then changed to a "shut off alarm" signal provided to said alarm controlling circuit for preventing the production of said alarm signal by said alarm controlling circuit;
an alarm generating circuit connecting with at least an alarm generator for generating a warning alarm when said alarm signal from said alarm controlling circuit is received; and
a transformer circuit for providing a low DC voltage for said detecting circuit, said alarm controlling circuit, said "normal function" detecting circuit, and said alarm generating circuit, which are electrically connected to form a whole alarm circuit of said alarm device.
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Accused Products
Abstract
An alarm device for an automatic garage door includes a detecting circuit for producing a single negative pulse signal when a detector detects an opening motion of said garage door, an alarm controlling circuit for receiving said single negative pulse signal and producing an alarm signal, a "normal function" detecting circuit connecting to a garage door opening machine for producing a "normal opening" signal when said garage door is normally opened by said garage door opening machine, which is then changed to a "shut off alarm" signal provided to said alarm controlling circuit for preventing the production of said alarm signal, an alarm generating circuit for generating an alarm when said alarm signal is received, and a transformer circuit for providing low voltage for said alarm device. Accordingly, the alarm device for an automatic garage door can provide a warning alarm when said garage door is forced to open or damaged by bandits or burglars. However, as long as the residents operate a normal remote control or in-house switch of said garage door to open or close it, said garage door will be opened and closed as usual (with no alarm).
43 Citations
25 Claims
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1. An alarm device for an automatic garage door of a garage, comprising
a detecting circuit, which comprises at least a detector installed to said garage door, for outputting a single negative pulse signal when said detector detects an opening motion of said garage door; -
an alarm controlling circuit, which is electrically connected with said detecting circuit, for receiving said single negative pulse signal from said detecting circuit and producing a warning signal; a "normal function" detecting circuit connecting to a garage door "normal operation" signal generating source which generates a "normal opening" signal to activate said "normal function" detecting circuit when said garage door is normally opened in a predetermined manner, said "normal opening" signal being then changed to a "shut off alarm" signal provided to said alarm controlling circuit for preventing the production of said alarm signal by said alarm controlling circuit; an alarm generating circuit connecting with at least an alarm generator for generating a warning alarm when said alarm signal from said alarm controlling circuit is received; and a transformer circuit for providing a low DC voltage for said detecting circuit, said alarm controlling circuit, said "normal function" detecting circuit, and said alarm generating circuit, which are electrically connected to form a whole alarm circuit of said alarm device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19)
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- 10. An alarm device as recited in 9 in which said alarm controlling circuit includes four resistors (R3) (R4) (R5) (R6) wherein said resistors (R3) and (R4) are connected to the control terminal of a transistor (Q2) which is further connected to said resistor (R5), a capacitor (C2) being connected in parallel with said resistor (R6) to form a time delay means which is connected in series with said transistor (Q2), so that said alarm controlling circuit is connected with said detecting circuit by connecting said resistor (R4) in series with said capacitor (C1), whereby when said garage do or is forced to open, said garage door opening machine has not been activated so that said "normal function" detecting circuit is an open circuit and does not function, said single negative pulse signal being input to said alarm controlling circuit, said capacitor (C2) gradually discharging electricity to said alarm generating circuit so as to generate said warning signal to activate said alarm generating circuit and constitute a delay function for controlling said predetermined alarm period of time of said warning alarm generated by said alarm generator, and whereby when said garage door is opened by said garage door opening machine, said "normal function" detecting circuit which is connected to the output of said time delay means of said alarm controlling circuit becomes a closed circuit, said capacitor (C2) discharging electricity to said "normal function" detecting circuit, so that production of said warning signal to said alarm generating circuit is prevented and no alarm is generated.
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20. An alarm device for an automatic garage door of a garage, comprising
a detecting circuit which comprises at least a detector installed to said garage door for producing a single negative pulse signal when said detector detects an opening motion of said garage door; -
a central controlling circuit which comprises an integrated circuit for receiving said single negative pulse signal and producing an alarm signal for a predetermined period of alarm time, at least an alarm generator which is an independent alarm generator installed in said garage for generating a warning alarm for said predetermined period of alarm time when said alarm signal is received; a "normal function" detecting circuit connected to a garage door "normal operation" signal generating source which is a garage door opening machine for outputting a "normal opening" signal when said garage door is normally opened by said garage door opening machine, wherein said "normal opening" signal is then changed to an alarm inhibit signal provided to said central controlling circuit for inhibiting the output of said alarm signal, said "normal function" detecting circuit including a photoelectric coupling tube for isolating a 110 V high voltage of said garage door machine from said central controlling circuit; and a transformer circuit for providing a low DC voltage for said detecting circuit, said central controlling circuit and said "normal function" detecting circuit, which are electrically connected to form a whole alarm circuit of said alarm device. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification