US3701141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warning system with plural identification of signalling stations
Assignee: PROTECTOWIRE CO
•
Filing: 1971-04-29
•
Granted: 1972-10-24
•
Expires: 1991-04-29
Abstract
Abstract A signalling system of the type with signalling devices stationed in protected premises and, upon actuation, transmitting a signal to a central receiving location. In the central receiving location, the system situates a plurality of zonal monitoring circuits, each of which is connected to and monitors a plurality of coded signalling devices forming a loop circuit. Each of the zonal monitoring circuits responds to reception of a coded signal by indicating through a first output path that a signal was received and by transmitting through a second output path the coded signal. At the receiving location, the receiver has an annunciator or indicator portion connecting with the first output paths of the zone circuits to indicate, for example by lighting a lamp, from which particular zone a signal originated. Also at the receiving location, a recorder portion is provided which connects in a loop with the second output paths of the zone circuits, and which both receives and records the coded signal, thereby providing a dual basis for positively identifying the location of a particular signalling device which has been actuated. In operation, the coded signalling devices provide a signal by opening their loop circuits. The zone circuits respond to this open circuit condition by de-energizing a relay which was energized through a loop circuit, which simultaneously removes a shunt placed across the zone circuit''s second output path, closes a circuit through the first output path to provide an indication that a signal has been generated, and energizes a second relay which transfers the signalling device loop circuit into connection with the zone circuit loop for transmission of the coded signal to the recorder. When the coded signal is completed, a reset switch is closed to one again energize the first relay.
Inventors
- 👤 Clifton B Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:51
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/04; G08B25/045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
191 words
A signalling system for indicating at a central receiving location the identify of a particular device in remote protected premises, which device has been actuated to transmit a signal, comprising a plurality of independent zonal monitoring circuits at said central receiving location, each of said zonal monitoring circuits being connected through separate connecting paths to a selected plurality of said signal devices located in said protected premises within a prescribed zone assigned to each said zonal monitoring circuits for monitoring said selected plurality of signal devices; each of said signal devices upon actuation having means for transmitting a unique coded signal to its assigned zonal monitoring circuit; each of said zonal monitoring circuits having means responsive to reception of a coded signal for indicating through a first output path that a signal was received and for transmitting through a second output path the coded signal; and at the receiving location, indicating means connecting with the first output paths of said zonal circuits for indicating the particular zone from which a signal originated, and recording means connecting with the second output paths of said zonal circuits for recording the transmitted coded signal.
Claim 2
Dependent Claim
191 words
A signalling system for indicating at a central receiving location the identify of a particular device in remote protected premises, which device has been actuated to transmit a signal, comprising a plurality of independent zonal monitoring circuits at said central receiving location, each of said zonal monitoring circuits being connected through separate connecting paths to a selected plurality of said signal devices located in said protected premises within a prescribed zone assigned to each said zonal monitoring circuits for monitoring said selected plurality of signal devices; each of said signal devices upon actuation having means for transmitting a unique coded signal to its assigned zonal monitoring circuit; each of said zonal monitoring circuits having means responsive to reception of a coded signal for indicating through a first output path that a signal was received and for transmitting through a second output path the coded signal; and at the receiving location, indicating means connecting with the first output paths of said zonal circuits for indicating the particular zone from which a signal originated, and recording means connecting with the second output paths of said zonal circuits for recording the transmitted coded signal.
Claim 3
Dependent Claim
83 words
A signalling system according to claim 1 wherein the signal devices in a prescribed zone are connected in a signal device loop with its assigned zonal monitoring circuit and transmit a signal by open circuiting said loop, the zonal monitoring circuits each having relay means responsive to open circuitry of said loop to close a relay switch in the first output path, the indicating means comprising for each zone an indicator device energized by the closing of said relay switch for that zone.
Claim 4
Dependent Claim
45 words
A signalling system according to claim 2 wherein said relay means is latched by the open circuiting of said signal device loop to maintain said relay switch closed, and wherein each zonal citcuit has reset means for restoring said relay means to a standby condition.
Claim 5
Dependent Claim
84 words
A signalling system according to claim 1 wherein said signal devices in each zone are connected in a signal device loop with the assigned zonal monitoring circuit, the zonal circuits have their second output paths connected in a zone circuit loop with said recording means, each zone having means for shunting said zone circuit loop, thereby to prevent interference with other zones, said zonal monitoring circuit transmitting said coded signal by removing said shunt and connecting said signal device into said zone circuit loop.
Claim 6
Dependent Claim
58 words
A signalling system according to claim 4 wherein said zonal monitoring circuits have relay means responsive to receipt of a coded signal, with relay switches connecting said signal devices into said zone circuit loop, said relay means latching upon receipt of a signal, said zone monitoring circuit having reset means to restore said relay means to standby condition.
Claim 7
Dependent Claim
161 words
A sigNalling system according to claim 4 wherein said signal device loop is connected in series with a power source and the winding of a normally energized first relay means through a pair of relay switches of a normally de-energized second relay means, said pair of relay switches having a second position connecting the signal device loop into said zone circuit loop when said second relay means is energized; the first relay means having a normally open relay switch for connecting the power source through the winding of the second relay means, and a normally closed relay switch for shunting the zone circuit loop at said second output path; whereby when said signal device loop is open circuited, said first relay means de-energizes, thereby removing the shunt from the zone circuit loop and energizing the second relay means, said second relay means transferring said signal device loop to said zone circuit loop and disconnecting said first relay from the power source.
Claim 8
Dependent Claim
32 words
Signalling device according to claim 6 wherein the normally open relay switch of said first relay means connects said power source through said first output path to thereby actuate said indicating means.
Claim 9
Dependent Claim
95 words
Signalling system according to claim 6 wherein said zonal circuit further comprises reset means for restoring the zone circuit to normal condition after a coded signal has been transmitted and said signal device loop is closed, said reset means comprising a switch temporarily connecting said power source through the winding of said first relay means to energize it, thereby returning the shunt to the zone loop, de-energizing the second relay means, and shifting said pair of relay switches to reconnect the signal device loop in series with the power source and first relay means winding.
Claim 10
Dependent Claim
42 words
Signalling system according to claim 6 wherein each zonal circuit further comprises testing means for simulating the transmission of a signal from said signal devices, comprising switch means for temporarily disconnecting said power source from the winding of said first relay means.
Claim 11
Dependent Claim
92 words
A signalling system according to claim 6 wherein said power source has a positive terminal and a ground terminal, the winding of the first relay means is connected adjacent said ground terminal, the signal device loop is connected through said pair of relay switches between said positive terminal and said first relay means winding, whereby a ground, open, or open with ground occurring in said signal device loop, all will cause said first relay means to become de-energized and cause said zonal circuit to react as if a signal had been given.
References Cited (Backward Citations)
US2699541A
Cited
US3150359A
Cited
US3448443A
Cited
US3500377A
Cited
US3484771A
Cited
US3540043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |