Alarm Origination Latching System and Method

• US 20090128353A1
• Filed: 11/19/2008
• Published: 05/21/2009
• Est. Priority Date: 11/20/2007
• Status: Active Grant

• Current Assignee: Universal Security Instruments Incorporated
• Original Assignee: Universal Security Instruments Incorporated
• Inventors: Gonzales, Eric V.
• Granted Patent: US 7,893,825 B2
• Time in Patent Office: Days
• US Class Current: 340/691.500
• CPC Class Codes: G08B 25/04 using a single signalling line, e.g. in a closed loop

Abstract

An embodiment of the invention provides a method including detecting a select hazardous condition by at least one triggering alarm unit of a plurality of interconnected hazardous condition alarm units. An actuatable latch in the triggering alarm unit is switched from an unlatched state to a latched state. An audible alert is generated in all of the interconnected alarm units. A test switch is actuated to identify the triggering alarm unit. Actuating the test switch disables the audible alert in each alarm unit having an actuatable latch in the unlatched state. A reset switch is actuated in only one of the alarm units to reset the actuatable latch in each of the alarm units to the unlatched state.

Claims

1. A selective hazardous condition detector, comprising:

a) means for interconnecting said selective hazardous condition detector to a second selective hazardous condition detector;

b) means for detecting a select hazardous condition;

c) means for generating an alarm signal corresponding to a detected select hazardous condition;

d) memory means for recognizing said alarm signal;

e) latch means switchable between an unlatched state and a latched state, said latched state being established in response to said alarm signal and said latched state existing for a preset time period;

f) means for selectively actuating said memory means and switching said latch means to said latched state; and

g) actuatable reset means for resetting the state of said latch means;

h) whereupon actuating said latch reset means switches said latch means from the latched to the unlatched state after said preset time period while switching the latched means to said unlatched state immediately in said second selective hazardous condition detector.

2. The detector according to claim 1, wherein said alarm signal is active in said selective hazardous condition detector during said preset time period, and wherein said alarm signal is inactive in said second selective hazardous condition detector during said preset time period.

3. The detector according to claim 1, wherein said alarm signal remains active in said selective hazardous condition detector after said select hazardous condition has been eliminated.

4. The detector according to claim 1, wherein said alarm signal comprises an audible alert.

5. The detector according to claim 4, wherein said audible alert corresponds to a select hazardous condition detected by said detector.

6. The detector according to claim 4, wherein said audible alert conforms to mandated patterns established by regulation.

7. A system comprising at least a first and a second interconnected hazardous condition alarm units, each of said alarm units comprising:

at least one hazardous condition detector;

a horn for generating an audible alert in response to detection of a select hazardous condition by at least one of said alarm units;

a signal communication member for communicating a signal between said at least first and second alarm units, said signal being sent in response to said detection of said select hazardous condition, and said signal causing activation of said horn;

an actuatable latch switchable between an unlatched state and a latched state, said latched state being established in response to said detection of said select hazardous condition;

a test switch switchable between a first position and a second position, said second position disabling a horn of each alarm unit of said alarm units comprising an actuatable latch in said unlatched state; and

a reset switch for resetting said actuatable latch in every alarm unit of said alarm units to said unlatched state.

8. The system according to claim 7, wherein each alarm unit of said alarm units comprising said actuatable latch in said latched state is unaffected by said test switch for a predetermined period of time following actuation of said test switch.

9. The system according to claim 7, wherein said test switch and said reset switch are a common switch, and wherein each of said alarm units further comprises a visual alert generated in response to said detection of said select hazardous condition.

10. The system according to claim 9, wherein said test switch disables said visual alert of said each alarm unit of said alarm units comprising said actuatable latch in said unlatched state.

11. The system according to claim 7, wherein said test switch:

activates a secondary alert different from said audible alert in said alarm units; and

disables said secondary alert in said each alarm unit of said alarm units comprising said actuatable latch in said unlatched state.

12. The system according to claim 7, wherein a threshold of sensitivity to said select hazardous condition remains unchanged upon actuation of said test switch to said second position.

13. The system according to claim 7, wherein said audible alert remains active in said each alarm unit of said alarm units comprising said actuatable latch in said latched state after said select hazardous condition has been eliminated.

14. A method comprising:

a) detecting a select hazardous condition by at least one triggering alarm unit of a plurality of interconnected hazardous condition alarm units;

b) switching an actuatable latch in said at least one triggering alarm unit from an unlatched state to a latched state;

c) generating an audible alert in said plurality of interconnected hazardous condition alarm units;

d) actuating a test switch to identify said at least one triggering alarm unit, said actuating of said test switch comprising disabling said audible alert in each alarm unit of said plurality of interconnected hazardous condition alarm units comprising an actuatable latch in said unlatched state; and

e) actuating a reset switch in only one alarm unit of said plurality of interconnected hazardous condition alarm units to reset said actuatable latch in each of said plurality of interconnected hazardous condition alarm units to said unlatched state.

15. The method according to claim 14, wherein said generating of said audible alert comprises:

sending an alert signal from said at least one triggering alarm unit to an interconnect line connecting each of said plurality of interconnected hazardous condition alarm units;

receiving said alert signal by said plurality of interconnected hazardous condition alarm units; and

in response to said receiving of said alert signal, activating said audible alert in said plurality of interconnected hazardous condition alarm units.

16. The method according to claim 14, wherein a threshold of sensitivity to said select hazardous condition remains unaffected by said actuation of said test switch.

17. The method according to claim 14, wherein said actuating of said test switch comprises unaffecting said audible alert in each alarm unit of said plurality of interconnected hazardous condition alarm units comprising an actuatable latch in said latched state.

18. The method according to claim 14, further comprising:

generating a visual alert in said plurality of interconnected hazardous condition alarm units; and

disabling said visual alert in said each alarm unit of said plurality of interconnected hazardous condition alarm units comprising said actuatable latch in said unlatched state.

19. The method according to claim 14, further comprising:

generating a secondary alert different from said audible alert in said plurality of interconnected hazardous condition alarm units; and

disabling said secondary alert in said each alarm unit of said plurality of interconnected hazardous condition alarm units comprising said actuatable latch in said unlatched state.

20. The method according to claim 14, further comprising maintaining said audible alert in said at least one triggering alarm unit after said select hazardous condition has been eliminated.