Intrusion alarm system
First Claim
Patent Images
1. In an intrusion alarm system:
- a closure having a latch assembly that includes a knob on one side of said closure for enabling opening of said closure as a result of operation of said assembly, said operation requiring physical action by a person with respect to said knob;
a lock mechanism included within said knob and selectively operable to lock or unlock said latch assembly;
an alarm apparatus associated with said latch assembly and disposed on the side of said door opposite said one side, said alarm apparatus including a battery, a generator powered by said battery and responsive to an input signal for developing a sound signal, and a transducer responsive to said sound signal for delivering an audible warning signal;
means responsive to said physical action for delivering said input signal to said generator when said latch assembly is in a locked condition of said lock mechanism;
and said responsive means being effectively disabled when said latch assembly is in an unlocked condition of said lock mechanism.
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Abstract
A lock mechanism is included within the outer knob of a latch assembly. Associated with the inner knob is an alarm apparatus that includes a battery, a sound generator and a transducer for delivering an audible signal. The different components of the alarm apparatus are located either in an escutcheon associated with the inner knob or within the body of the knob itself. In either case, the latch assembly includes switch contacts which close to operate the alarm apparatus upon a very slight twisting of the outer knob.
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Citations
30 Claims
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1. In an intrusion alarm system:
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a closure having a latch assembly that includes a knob on one side of said closure for enabling opening of said closure as a result of operation of said assembly, said operation requiring physical action by a person with respect to said knob; a lock mechanism included within said knob and selectively operable to lock or unlock said latch assembly; an alarm apparatus associated with said latch assembly and disposed on the side of said door opposite said one side, said alarm apparatus including a battery, a generator powered by said battery and responsive to an input signal for developing a sound signal, and a transducer responsive to said sound signal for delivering an audible warning signal; means responsive to said physical action for delivering said input signal to said generator when said latch assembly is in a locked condition of said lock mechanism; and said responsive means being effectively disabled when said latch assembly is in an unlocked condition of said lock mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. For use in an intrusion alarm system, a lockset having a latch bolt reciprocable to latch and unlatch a closure, a shaft mounted in said closure and movable to effect reciprocation of said latch bolt, means coupled between said latch bolt and said shaft for reciprocating said latch bolt in response to movement of said shaft, and the improvement comprising:
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a pair of electrical contacts mounted with respect to said shaft for relative movement into and out of mutual engagement; means for establishing a pair of current-conducting paths individually leading from respective different ones of said contacts; means responsive to said movement of said shaft for effecting said relative movement of said contacts; means for locking said shaft against said movement thereof in an amount sufficient to effect unlatching of said closure by said latch bolt; and means for effecting said relative movement of said contacts into said mutual engagement upon the initiation of said movement of said shaft when in a locked condition. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification