US3846782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection system for protected area with keyboard inhibitor for re-entry
Assignee: Individual
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Filing: 1973-01-31
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Granted: 1974-11-05
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Expires: 1993-01-31
Abstract
Abstract A detection system is designed so that any detected unauthorized entry into the protected area produces an output or alarm signal. The system includes a keyboard inhibitor accessible from outside the protected area. To leave the protected area without actuating the system, a person pushes an ''''EXIT'''' push button to inhibit actuation of the alarm signal. After he leaves the area, the system is actuated again by pressing a designated button on the keyboard. A subsequent entry without actuating the alarm signal can be made only by actuating certain designated switches on the keyboard in a predetermined sequence to, again, inhibit the alarm signal. Upon proper re-entry, the person resets the system to a normal operating condition.
Inventors
- 👤 R Brodsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:40
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/008; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
247 words
A detection system for a protected area comprising: a plurality of sensing elements, connected in circuit, each operatively associated with an access to said area for detecting an unauthorized breach of said area, master switch means adapted to be enabled or inhibited and responsive to said sensing elements only when enabled for generating an output signal when one of said elements indicated an alarm condition in said area; a manual selection switch, selectively settable to one of a SURVEILLANCE position and an EXIT position; said master switch means being enabled when said manual switch is set to said SURVEILLANCE state; a keyboard having a plurality of switches including unlock switches accessible external to said protected area; inhibit circuit means responsive to the actuation of predetermined unlock switches of said keyboard switches when said manual switch is set in said EXIT position for inhibiting said master switch means whereby an authorized re-entry may be made into said protected area without generating said output signal; and EXIT switch means located within said protected area for deactivating said inhibit circuit means when it is desired to leave said protected area without sounding an alarm; and reset circuit means responsive to at least one of said keyboard switches other than said unlock switches for re-activating said inhibit circuit means after a person has left said protected area, whereby said system is left in an active state but capable of being inhibited when said keyboard unlock switches are actuated in proper combination.
Claim 2
Dependent Claim
247 words
A detection system for a protected area comprising: a plurality of sensing elements, connected in circuit, each operatively associated with an access to said area for detecting an unauthorized breach of said area, master switch means adapted to be enabled or inhibited and responsive to said sensing elements only when enabled for generating an output signal when one of said elements indicated an alarm condition in said area; a manual selection switch, selectively settable to one of a SURVEILLANCE position and an EXIT position; said master switch means being enabled when said manual switch is set to said SURVEILLANCE state; a keyboard having a plurality of switches including unlock switches accessible external to said protected area; inhibit circuit means responsive to the actuation of predetermined unlock switches of said keyboard switches when said manual switch is set in said EXIT position for inhibiting said master switch means whereby an authorized re-entry may be made into said protected area without generating said output signal; and EXIT switch means located within said protected area for deactivating said inhibit circuit means when it is desired to leave said protected area without sounding an alarm; and reset circuit means responsive to at least one of said keyboard switches other than said unlock switches for re-activating said inhibit circuit means after a person has left said protected area, whereby said system is left in an active state but capable of being inhibited when said keyboard unlock switches are actuated in proper combination.
Claim 3
Dependent Claim
85 words
The system of claim 1 wherein said inhibit circuit means includes a plurality of decode circuits, one associated with each of said predetermined keyboard unlock switches, each decode circuit being actuated only when its associated unlock switch is actuated in the desired sequence; circuit means responsive to keyboard switches other than said unlock switches for resetting any of said decode circuits if actuated, said system being further adapted to disable said inhibit circuitry when said selection switch is positioned in said surveillance state upon re-entry.
Claim 4
Dependent Claim
25 words
The system of claim 1 further comprising first indicator light means within said protected area for indicating when power is supplied to said control switch.
Claim 5
Dependent Claim
63 words
The system of claim 3 further comprising second indicator lamp means for indicating when said control switch is sounding an alarm, said system further comprising alarm circuit means responsive to said control switch for sounding an alarm, said manual selection switch further comprising a test position wherein energy is supplied only to said control switch circuitry and not to said output alarm circuitry.
Claim 6
Dependent Claim
23 words
The system of claim 1 further comprising third indicator lamp means within said protected area for indicating when said inhibit circuitry is energized.
Claim 7
Dependent Claim
25 words
The system of claim 5 further comprising fourth indicator lamp means for indicating when said inhibit circuitry has been actuated to inhibit said control switch.
Claim 8
Dependent Claim
17 words
The system of claim 1 further comprising indicator means for indicating when said inhibit circuitry is actuated.
Claim 9
Dependent Claim
238 words
A detecting system for a protected area comprising: a plurality of sensing elements connected in circuit and establishing circuit continuity when all of said elements are in a first state representative of a secured area; a manual selection switch having a plurality of positions including an EXIT position and a SURVEILLANCE position; a source of electrical power; a control switch connected in circuit with said sensing elements for generating an output signal when any of said elements indicates an alarm condition; output circuit means connected in circuit with said selection switch and said power source responsive to said alarm signal for transmitting an alarm when said control element is actuated and said selection switch is in said SURVEILLANCE position; inhibit circuitry for inhibiting the operation of said control switch when actuated; said manual switch coupling power to said inhibit circuitry only when said switch is in said EXIT position; an exit switch in said protected area for actuating said inhibiting circuitry; only when said selection switch is in said EXIT position; a plurality of switches external to said protected area and including a plurality of sequential unlock switches and other switches, one of said other switches resetting said inhibit circuitry to an inactive state when pushed to override said exit switch; said inhibit circuitry being responsive to the proper sequential actuation of said unlock switches for inhibiting said control switch to permit the entry without sounding an alarm.
Claim 10
Dependent Claim
238 words
A detecting system for a protected area comprising: a plurality of sensing elements connected in circuit and establishing circuit continuity when all of said elements are in a first state representative of a secured area; a manual selection switch having a plurality of positions including an EXIT position and a SURVEILLANCE position; a source of electrical power; a control switch connected in circuit with said sensing elements for generating an output signal when any of said elements indicates an alarm condition; output circuit means connected in circuit with said selection switch and said power source responsive to said alarm signal for transmitting an alarm when said control element is actuated and said selection switch is in said SURVEILLANCE position; inhibit circuitry for inhibiting the operation of said control switch when actuated; said manual switch coupling power to said inhibit circuitry only when said switch is in said EXIT position; an exit switch in said protected area for actuating said inhibiting circuitry; only when said selection switch is in said EXIT position; a plurality of switches external to said protected area and including a plurality of sequential unlock switches and other switches, one of said other switches resetting said inhibit circuitry to an inactive state when pushed to override said exit switch; said inhibit circuitry being responsive to the proper sequential actuation of said unlock switches for inhibiting said control switch to permit the entry without sounding an alarm.
Claim 11
Dependent Claim
38 words
The system of claim 8 wherein said inhibit circuitry includes matrix circuit means connected in circuit with said unlock switches for preventing actuation of said inhibit circuit when more than one of said unlock switches are actuated simultaneously.
Claim 12
Dependent Claim
191 words
A detection system for a protected area comprising a plurality of detectors connected in circuit, each operatively associated with an access to said area and actuated upon entry to said protected area; a master switch responsive to the actuation of any of said detectors for generating an output signal when said detector indicates an alarm condition in said area; a manual switch selectively settable to one of a SURVEILLANCE position and an EXIT positioN; circuit means for setting said master switch to an enabled state when said manual switch is set to said SURVEILLANCE position; keyboard means having a plurality of unlock switches accessible external to said protected area; and inhibit circuit means responsive to the actuation of predetermined unlock switches of said keyboard means when said manual switch is set to said EXIT position for inhibiting said master switch means whereby an authorized re-entry may be made into said protected area without generating an output signal; said system being further responsive to said manual switch''s being set to said SURVEILLANCE position after re-entry for inactivating said inhibit circuit means and for resetting said master switch means to an active state.
Claim 13
Dependent Claim
191 words
A detection system for a protected area comprising a plurality of detectors connected in circuit, each operatively associated with an access to said area and actuated upon entry to said protected area; a master switch responsive to the actuation of any of said detectors for generating an output signal when said detector indicates an alarm condition in said area; a manual switch selectively settable to one of a SURVEILLANCE position and an EXIT positioN; circuit means for setting said master switch to an enabled state when said manual switch is set to said SURVEILLANCE position; keyboard means having a plurality of unlock switches accessible external to said protected area; and inhibit circuit means responsive to the actuation of predetermined unlock switches of said keyboard means when said manual switch is set to said EXIT position for inhibiting said master switch means whereby an authorized re-entry may be made into said protected area without generating an output signal; said system being further responsive to said manual switch''s being set to said SURVEILLANCE position after re-entry for inactivating said inhibit circuit means and for resetting said master switch means to an active state.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |