US3828340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intrusion alarm actuating apparatus
Assignee: SCANTRONIC Inc
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Filing: 1973-06-15
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Granted: 1974-08-06
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Expires: 1993-06-15
Abstract
Abstract A sensing apparatus enclosed in a small attractive housing for attachment to standard door locking hardware or the like and including simple magnetic door closure sensing switches, a photosensitive locking mechanism detector and compact electronic logic circuitry combined in such a manner as to simultaneously detect the door closure and condition of the locking mechanism, and then actuate either an external hard-wired alarm circuit or the radio frequency transmitter of a wireless alarm system should the door be opened without first being unlocked in the normal manner. The alarm system is thus in effect armed and disarmed by the normal locking and unlocking of the door.
Inventors
- 👤 R Bauer
- 👤 D Schuldt
- 👤 E Shum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:22
CPC Classifications
E; E05; E05B; E05B45/00; E05B45/06; G; G08; G08B; G08B13/00; G08B13/02; G08B13/08; Y; Y10; Y10S; Y10S70/00; Y10S70/51; Y10T; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7062; Y10T70/7068; Y10T70/7073; Y10T70/7079
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
167 words
Apparatus for use in combination with a closure locking mechanism to detect a forced opening of the closure and to actuate an alarm circuit, comprising: lock detecting means for determining whether the locking mechanism is in a locked state or an unlocked state and for developing corresponding lock state signals; first closure detecting means for determining whether the closure is in an open position or in a closed position and for developing corresponding closure position signals; second closure detecting means for actuating the alarm circuit when said closure is in said open position; over-ride means for selectively preventing said second closure detecting means from actuating said alarm circuit; and logic means responsive to said lock state signals and said closure position signals and operative to actuate said override means to prevent said second closure detecting means from actuating said alarm circuit as said Closure is opened unless said closure is moved from the closed position to an open position with said locking mechanism in its locked state.
Claim 2
Dependent Claim
167 words
Apparatus for use in combination with a closure locking mechanism to detect a forced opening of the closure and to actuate an alarm circuit, comprising: lock detecting means for determining whether the locking mechanism is in a locked state or an unlocked state and for developing corresponding lock state signals; first closure detecting means for determining whether the closure is in an open position or in a closed position and for developing corresponding closure position signals; second closure detecting means for actuating the alarm circuit when said closure is in said open position; over-ride means for selectively preventing said second closure detecting means from actuating said alarm circuit; and logic means responsive to said lock state signals and said closure position signals and operative to actuate said override means to prevent said second closure detecting means from actuating said alarm circuit as said Closure is opened unless said closure is moved from the closed position to an open position with said locking mechanism in its locked state.
Claim 3
Dependent Claim
43 words
Apparatus as recited in claim 1 wherein said lock detecting means includes a light source and a light detector in combination whereby the presence or absence of light from said source falling upon said detector indicates the operative state of said locking mechanism.
Claim 4
Dependent Claim
32 words
Apparatus as recited in claim 1 wherein at least one of said first and second closure detecting means includes an electrical switching means actuated by the opening and closing of said closure.
Claim 5
Dependent Claim
48 words
Apparatus as recited in claim 3 wherein said electrical switching means includes a magnetically actuated switch carried by said closure, and a magnet affixed to a wall for receiving said closure and in a position for actuating said switch when said closure is in the said closed position.
Claim 6
Dependent Claim
42 words
Apparatus as recited in claim 1 wherein said second closure detecting means includes a first electrical switch connected in said alarm circuit, and wherein said over-ride means includes a relay having a second electrical switch connected in parallel with said first switch.
Claim 7
Dependent Claim
34 words
Apparatus as recited in claim 1 wherein said logic means includes a NOR circuit having one logic gate responsive to said lock state signals and another logic gate responsive to said closure position signals.
Claim 8
Dependent Claim
161 words
Sensing apparatus for detecting unauthorized opening of a closure and for actuating an alarm device, comprising: first means responsive to an open condition of said closure and operative to actuate said alarm device; second means responsive to the operative state of a closure locking mechanism and operative to develop an unlocked signal when said locking mechanism is unlocked; third means responsive to the position of said closure and operative to develop closure position signals including an open signal when said closure is open and a closed signal when said closure is closed; logic means responsive to said locked signal and said closure position signals and operative to develop an actuating signal when said locked signal is developed and said closure position signal changes from said closed signal to said open signal; and fourth means responsive to said actuating signal and operative to disable said first means to prevent said first means from actuating said alarm device as said closure is opened.
Claim 9
Dependent Claim
161 words
Sensing apparatus for detecting unauthorized opening of a closure and for actuating an alarm device, comprising: first means responsive to an open condition of said closure and operative to actuate said alarm device; second means responsive to the operative state of a closure locking mechanism and operative to develop an unlocked signal when said locking mechanism is unlocked; third means responsive to the position of said closure and operative to develop closure position signals including an open signal when said closure is open and a closed signal when said closure is closed; logic means responsive to said locked signal and said closure position signals and operative to develop an actuating signal when said locked signal is developed and said closure position signal changes from said closed signal to said open signal; and fourth means responsive to said actuating signal and operative to disable said first means to prevent said first means from actuating said alarm device as said closure is opened.
Claim 10
Dependent Claim
48 words
Sensing apparatus as recited in claim 7 wherein said first means includes a first switch forming a part of the actuating circuit of said alarm device, said first switch having one switching position when said closure is open and having another switching position when said closure is closed.
Claim 11
Dependent Claim
47 words
Sensing apparatus as recited in claim 8 wherein said fourth means includes a second switch connected in shunt with said first switch, said second switch having one switching position when said actuating signal is developed and having another switching position when said actuating signal is not developed.
Claim 12
Dependent Claim
56 words
Sensing apparatus as recited in claim 7 wherein said second means includes an opto-electrical device which is positioned relative to a moving part of said locking mechanism to develop said unlocked signal when said moving part is in an unlocked position and to develop said locked signal when said moving part is in a locked position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |