US3587095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supervised annunciator
Assignee: Gray Manufacturing Co Inc
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Filing: 1968-05-07
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Granted: 1971-06-22
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Expires: 1988-05-07
Abstract
Abstract A completely supervised alarm system having an alarm panel and a remote annunciator unit which is interconnected to the alarm panel. The alarm system is characterized by a memory capability, the ability to add additional circuits to be monitored without additional wiring between the main alarm and remote annunciator panels and without disturbing preexisting supervisory wiring. The system is also characterized by employment of a bidirectional silicon controlled rectifier for supplying energization for audible warning devices and by use of a single relay for the monitoring for open and ground conditions on all interconnecting wiring and on the annunciator internal circuitry.
Inventors
- 👤 Leonard E Earling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:17
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/02; G08B29/10; G08B29/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
An annunciated alarm system comprising: condition responsive means; normally inoperative annunciator means connected in a series with said condition responsive means; means for supplying supervisory current to said annunciator means; first switch means electrically connected to said annunciator means and responsive to a failure of the supervisory current flow, said switch means normally presenting an open circuit to current flow; malfunction warning means; and means electrically connected to said switch means and to said warning means for energizing said warning means upon operation of said switch means in response to a failure of supervisory current flow.
Claim 2
Dependent Claim
96 words
An annunciated alarm system comprising: condition responsive means; normally inoperative annunciator means connected in a series with said condition responsive means; means for supplying supervisory current to said annunciator means; first switch means electrically connected to said annunciator means and responsive to a failure of the supervisory current flow, said switch means normally presenting an open circuit to current flow; malfunction warning means; and means electrically connected to said switch means and to said warning means for energizing said warning means upon operation of said switch means in response to a failure of supervisory current flow.
Claim 3
Dependent Claim
98 words
The apparatus of claim 1 wherein said warning means is located on an alarm panel and said annunciator means comprises a remotely located annunciator panel, said panels being interconnected by a plurality of conductorS, and wherein said energizing means comprises: normally open second switch means connected in series with said warning means, said second switch means being in a normally energized state whereby operation of said first switch means or a malfunction in the wiring interconnecting the panels will cause deenergization of said second switch means and coincident closing thereof to complete a circuit to said warning means.
Claim 4
Dependent Claim
43 words
The apparatus of claim 2 further comprising: alarm means; means for supplying current to said alarm means; and means connecting said current supply means to said alarm means, said connecting means including first current limiting means connected in series with said alarm means.
Claim 5
Dependent Claim
29 words
The apparatus of claim 1 wherein said means for supplying supervisory current to said annunciator means comprises: second current limiting means connected in parallel with said condition responsive means.
Claim 6
Dependent Claim
77 words
The apparatus of claim 4 wherein said condition responsive means normally presents an open circuit and wherein said annunciator means comprises: self-latching relay means, a first set of normally open contacts of said relay means establishing a short of circuit across said condition responsive means and said second current responsive means upon energization of said relay means in response to operation of said condition responsive means to create a temporary shunt across said second current limiting means.
Claim 7
Dependent Claim
29 words
The apparatus of claim 3 wherein said means for supplying supervisory current to said annunciator means comprises: second current limiting means connected in parallel with said condition responsive means.
Claim 8
Dependent Claim
76 words
The apparatus of claim 6 wherein said condition responsive means normally presents an open circuit and wherein said annunciator means comprises: self-latching relay means, a first set of normally open contacts of said relay means establishing a short circuit across said condition responsive means and said second current responsive means upon energization of said relay means in response to operation of said condition responsive means to create a temporary shunt across said second current limiting means.
Claim 9
Dependent Claim
56 words
The apparatus of claim 7 wherein said annunciator means further comprises: a second set of normally open contacts, said second set of contacts being connected in parallel with said first current limiting means whereby energization of said relay means short circuits said first current limiting means and said alarm means are energized by the increased current.
Claim 10
Dependent Claim
89 words
The apparatus of claim 1 wherein said first switch means comprises: a first normally conducting transistor, normally reverse biased diode means connected between said annunciator and the base of said first transistor, a decrease in supervisory current causing said diode to conduct, conduction of said diode causing a decrease in the forward bias voltage on said first transistor whereby said first transistor is switched to a nonconductive state; and means connected to said energizing means and responsive to the switching of said first transistor for deenergizing said energizing means.
Claim 11
Dependent Claim
89 words
The apparatus of claim 8 wherein said first switch means comprises: a first normally conducting transistor, normally reverse biased diode means connected between said annunciator and the base of said first transistor, a decrease in supervisory current causing said diode to conduct, conduction of said diode causing a decrease in the forward bias voltage on said first transistor whereby said first transistor is switched to a nonconductive state; and means connected to said energizing means and responsive to the switching of said first transistor for deenergizing said energizing means.
Claim 12
Dependent Claim
21 words
The apparatus of claim 10 wherein said means for supplying current to said alarm means includes: a bidirectional silicon controlled rectifier.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |