US3587112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically operated signal recording device for protective systems
Assignee: American District Telegraph Co
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Filing: 1969-11-12
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Granted: 1971-06-22
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Expires: 1989-11-12
Abstract
Abstract The present invention comprises a completely electrically operated signal recording device for use with central station electrical protection systems of the McCulloh type. Means are provided to ensure fast starting of the recorder upon the receipt of an incoming signal, to allow for a period of tape runout upon the completion of the signal, to permit the receipt of signals from two protection circuits simultaneously without interference and to allow the concurrent testing of both recorder signal channels. All of the feature of the prior art mechanically driven signal recorders have been retained in a design both simple and inexpensive to manufacture and maintain.
Inventors
- 👤 Frederick G Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:12
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/04; G08B25/045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
226 words
In a recorder for use in electrical protective systems and adapted to make a visible record of signals in the form of electrical pulses originating in either of two separate signaling circuits, said recorder having a supply of tape, two printing magnets one responsive only to signals originating in one of said circuits and the other responsive only to signals originating in the other of said circuits, two printing fingers associated respectively with said magnets and so positioned as to strike and cause the formation of a visible mark upon said tape upon energization of the associated magnet, the improvement which comprises tape advancing means including an electric motor for advancing said tape relative to said printing fingers during any time that at Least one of said magnets is energized whereby the printing finger associated with a magnet so energized is effective to form said visible mark as said tape is so advancing, electronic switching means including transistor means and resistance-capacitor means for starting said motor upon the energization of at least one of said magnets and for causing said motor to continue running for a predetermined period of time commencing at any time that both of said magnets become deenergized and manually operable switching means for testing the operative condition of said magnets, said printing fingers, said electronic switching means and said tape advancing means.
Claim 2
Dependent Claim
226 words
In a recorder for use in electrical protective systems and adapted to make a visible record of signals in the form of electrical pulses originating in either of two separate signaling circuits, said recorder having a supply of tape, two printing magnets one responsive only to signals originating in one of said circuits and the other responsive only to signals originating in the other of said circuits, two printing fingers associated respectively with said magnets and so positioned as to strike and cause the formation of a visible mark upon said tape upon energization of the associated magnet, the improvement which comprises tape advancing means including an electric motor for advancing said tape relative to said printing fingers during any time that at Least one of said magnets is energized whereby the printing finger associated with a magnet so energized is effective to form said visible mark as said tape is so advancing, electronic switching means including transistor means and resistance-capacitor means for starting said motor upon the energization of at least one of said magnets and for causing said motor to continue running for a predetermined period of time commencing at any time that both of said magnets become deenergized and manually operable switching means for testing the operative condition of said magnets, said printing fingers, said electronic switching means and said tape advancing means.
Claim 3
Dependent Claim
90 words
A recorder in accordance with claim 1 in which said manually operable switching means comprises a normally open switch, means including a plurality of diodes connecting said switch with both of said printing magnets and so oriented as to cause energization of both of said magnets and of said electronic switching means upon the closing of said normally open switch, and further diode means so oriented as to isolate each of said printing magnets for individual energization in response to signals when said normally open switch is in open position.
Claim 4
Dependent Claim
151 words
A recorder in accordance with claim 1 in which said electronic switching means includes a first transistor connected in series with said motor and a source of potential for energizing said motor when said first transistor is in a conductive state, a second transistor connected in series with resistive means and said source of potential for deriving a potential to maintain said first transistor in conductive state as long as said second transistor remains in conductive state, a capacitor, means effective upon the energization of at least one of said printing magnets to charge said capacitor and simultaneously to place said second transistor in conductive state, and a resistive circuit effective at any time that both of said printing magnets become deenergized to gradually discharge said capacitor over a predetermined period of time during which the decreasing charge in said capacitor is effective to maintain said second transistor in conductive state.
Claim 5
Dependent Claim
151 words
A recorder in accordance with claim 2 in which said electronic switching means includes a first transistor connected in series with said motor and a source of potential for energizing said motor when said first transistor is in a conductive state, a second transistor connected in series with resistive means and said source of potential for deriving a potential to maintain said first transistor in conductive state as long as said second transistor remains in conductive state, a capacitor, means effective upon the energization of at least one of said printing magnets to charge said capacitor and simultaneously to place said second transistor in conductive state, and a resistive circuit effective at any time that both of said printing magnets become deenergized to gradually discharge said capacitor over a predetermined period of time during which the decreasing charge in said capacitor is effective to maintain said second transistor in conductive state.
Claim 6
Dependent Claim
45 words
A recorder in accordance with claim 3 in which said second transistor is connected with said source of potential through diode means so oriented as to prevent the discharge of said capacitor through any path having a lower resistance than that of said resistive circuit.
Claim 7
Dependent Claim
45 words
A recorder in accordance with claim 4 in which said second transistor is connected with said source of potential through diode means so oriented as to prevent the discharge of said capacitor through any path having a lower resistance than that of said resistive circuit.
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 |