US3789147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone exchange equipment condition change detecting apparatus
Assignee: Fujitsu Ltd
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Filing: 1972-03-08
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Granted: 1974-01-29
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Expires: 1992-03-08
Abstract
Abstract Condition change detecting apparatus detects the change of condition of an operation peripheral device by a variation in direct current flowing through a line. The change detecting apparatus has a condition detecting element and an impedance element equivalent to the value of impedance difference caused by the operation of the peripheral device. The condition detecting element comprises a magnetic core, a control winding on the core for detecting the line current, a compensating winding on the core for producing a magnetic field in a direction which negates the magnetic field produced by the control winding, a drive winding on the core and a sense winding on the core. The impedance element is connected in the line and the magnitude of current supplied to the compensating winding is determined by scanning means. The impedance element is then disconnected from the line.
Inventors
- 👤 Y Saito
- 👤 T Okada
- 👤 E Odera
- 👤 T Matsuzawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:27
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
210 words
Apparatus for detecting a change in condition in equipment, said apparatus comprising a magnetic core; a control winding wound on said core and connected in a line of a circuit having a current which varies in accordance with a change of condition of the equipmemt for detecting the line current and producing a magnetic field in accordance with said line current; a compensating winding wound on said core for producing a magnetic field opposite to the magnetic field produced by said control winding; a drive winding wound on said core; drive means connected to said drive winding for supplying drive current to said drive winding to produce a magnetic field in said drive winding; a sense winding wound on said core for sensing the magnetic condition of said core; an impedance element having an impedance equivalent to the minimum value of impedance difference caused by the operation of the equipment, the impedance of said impedance element limiting said line current; connecting means connecting said impedance element in the line of the circuit, and disconnecting said impedance element from the line of the circuit; compensating resistors; and scanner means connecting said compensating winding to some of the compensating resistors in steps for determining the magnitude of current through said compensating winding.
Claim 2
Dependent Claim
210 words
Apparatus for detecting a change in condition in equipment, said apparatus comprising a magnetic core; a control winding wound on said core and connected in a line of a circuit having a current which varies in accordance with a change of condition of the equipmemt for detecting the line current and producing a magnetic field in accordance with said line current; a compensating winding wound on said core for producing a magnetic field opposite to the magnetic field produced by said control winding; a drive winding wound on said core; drive means connected to said drive winding for supplying drive current to said drive winding to produce a magnetic field in said drive winding; a sense winding wound on said core for sensing the magnetic condition of said core; an impedance element having an impedance equivalent to the minimum value of impedance difference caused by the operation of the equipment, the impedance of said impedance element limiting said line current; connecting means connecting said impedance element in the line of the circuit, and disconnecting said impedance element from the line of the circuit; compensating resistors; and scanner means connecting said compensating winding to some of the compensating resistors in steps for determining the magnitude of current through said compensating winding.
Claim 3
Dependent Claim
28 words
Apparatus as claimed in claim 1, further comprising a line adjusting resistor, and wherein said connecting means connects said line adjusting resistor in series with said control winding.
Claim 4
Dependent Claim
80 words
Apparatus as claimed in claim 1, further comprising a thyristor having anode, cathode and gate electrodes, and a release pulse generator coupled to said thyristor, and wherein said sense winding is connected between the cathode and gate electrode of said thyristor in a manner whereby an output signal in said sense winding switches said thyristor to its conductive condition, said release pulse generator supplying release pulses of brief duration to said thyristor to switch said thyristor to its non-conductive condition.
Claim 5
Independent Claim
364 words
A system for detecting a change in condition in any of a plurality of equipments, each of said equipments transmitting multifrequency signals, said system comprising a plurality of multifrequency receivers for receiving the multifrequency signals transmitted from said equipments and converting said signals into DC signals; a plurality of multifrequency originating registers; apparatus for detecting a change in condition in any of said equipments by detecting a slight change in magnitude in DC in a line of a circuit having a current which varies in accordance with a change of condition of the equipment each time multifrequency signals are transmitted by the equipment, said apparatus comprising a magnetic core, a control winding wound on said core and connected in the line of the circuit for detecting the line current and producing a magnetic field in accordance with said line current, a compensating winding wound on said core for producing a magnetic field opposite to the magnetic field produced by said control winding, a drive winding wound on on said core, drive means connected to said drive winding for supplying drive current to said drive winding to produce a magnetic field in said drive winding, a sense winding wound on said core for sensing the magnetic condition of said core, an impedance element having an impedance equivalent to the minimum value of impedance difference caused by the operation of the equipment, the impedance of said impedance element limiting said line current, connectiNg means for connecting said impedance element in the line of the circuit and for disconnecting said impedance element from the line of the circuit, compensating resistors, and scanner means connecting said compensating winding to some of the compensating resistors in steps for determining the magnitude of current through said compensating winding; and a connector for connecting each of said receivers to a corresponding one of said registers, said connector providing a multifrequency signal transfer line between an equipment and a selected multifrequency receiver when there is a change in magnitude in said DC, said selected receiver converting said signals into DC signals, and a register removing said multifrequency signal transfer line when the DC signals are transferred from said receiver to said register.
Claim 6
Independent Claim
364 words
A system for detecting a change in condition in any of a plurality of equipments, each of said equipments transmitting multifrequency signals, said system comprising a plurality of multifrequency receivers for receiving the multifrequency signals transmitted from said equipments and converting said signals into DC signals; a plurality of multifrequency originating registers; apparatus for detecting a change in condition in any of said equipments by detecting a slight change in magnitude in DC in a line of a circuit having a current which varies in accordance with a change of condition of the equipment each time multifrequency signals are transmitted by the equipment, said apparatus comprising a magnetic core, a control winding wound on said core and connected in the line of the circuit for detecting the line current and producing a magnetic field in accordance with said line current, a compensating winding wound on said core for producing a magnetic field opposite to the magnetic field produced by said control winding, a drive winding wound on on said core, drive means connected to said drive winding for supplying drive current to said drive winding to produce a magnetic field in said drive winding, a sense winding wound on said core for sensing the magnetic condition of said core, an impedance element having an impedance equivalent to the minimum value of impedance difference caused by the operation of the equipment, the impedance of said impedance element limiting said line current, connectiNg means for connecting said impedance element in the line of the circuit and for disconnecting said impedance element from the line of the circuit, compensating resistors, and scanner means connecting said compensating winding to some of the compensating resistors in steps for determining the magnitude of current through said compensating winding; and a connector for connecting each of said receivers to a corresponding one of said registers, said connector providing a multifrequency signal transfer line between an equipment and a selected multifrequency receiver when there is a change in magnitude in said DC, said selected receiver converting said signals into DC signals, and a register removing said multifrequency signal transfer line when the DC signals are transferred from said receiver to said register.
Claim 7
Dependent Claim
23 words
A system as claimed in claim 4, further comprising separate control means for separately controlling said connector and the multifrequency signal transfer line.
Claim 8
Dependent Claim
42 words
A system as claimed in claim 4, wherein said multifrequency signal transfer line includes switching means having a rectifier, and said register controls said multifrequency signal transfer line by applying an electrical potential to said multifrequency signal transfer line via said rectifier.
Claim 9
Dependent Claim
62 words
A system as claimed in claim 4, wherein said register includes a first relay energized by the output signal of said sense winding and deenergized by the detection of multifrequency signals, and a second relay energized by the suppression of the output signal of said sense winding for more than a specified period of time during the energization of said first relay.
Claim 10
Dependent Claim
106 words
A system as claimed in claim 4, wherein said register includes a first relay energized by the output signal of said sense winding and deenergized by the detection of multifrequency signals, a second relay energized by the suppression of the output signal of said sense winding for more than a specified period of time during the energization of said first relay, a third relay for detecting the multifrequency signals, and a fourth relay energized by the energization of said third relay and maintained energized during the provision of an output signal by said sense winding, said third relay being deenergized by energization of said fourth relay.
Claim 11
Dependent Claim
72 words
A system as claimed in claim 4, wherein said connector comprises a plurality of selectors each corresponding to a corresponding one of said multifrequency receivers, each of said selectors having a priority designation memory relay energized by the output of the next-preceding selector and deenergized by operation of another of said selectors, and further comprising means for supplying a priority selection signal to a selector whose priority designation memory relay is energized.
Claim 12
Dependent Claim
135 words
A system as claimed in claim 4, wherein said connector comprises a plurality of selectors each corresponding to a corresponding one of said multifrequency receivers, each of said selectors having a plurality of sets of start detecting relays and connector relays, each set corresponding to a corresponding one of said multifrequency originating registers in a manner whereby when a selector is operated simultaneously by a plurality of multifrequency originating registers start detecting relays of the operated selector corresponding to operating multifrequency originating registers are energized thereby energizing corresponding connector relays, the earliest energized connector relay deenergizing other start detecting relays than that corresponding to the earliest energized connector relay, the energization of the start detecting relay and the connector relay of a set causing a multifrequency receiver to be connected to a multifrequency originating register.
Claim 13
Dependent Claim
206 words
Apparatus for detecting a change in condition in equipment, said apparatus comprising a magnetic core; a control winding wound on said core and connected in a line of a circuit having a current which varies in accordance with a change of conditiOn of the equipment for detecting the line current and producing a magnetic field in acordance with said line current; a compensating winding wound on said core for producing a magnetic field opposite to the magnetic field produced by said control winding; a drive winding wound on said core; drive means connected to said drive winding for supplying drive current to said drive winding to produce a magnetic field in said drive winding; a sense winding wound on said core for sensing the magnetic condition of said core; an impedance element having an impedance equivalent to a variation of impedance of the equipment, the impedance of said impedance element limiting said line current; and connecting means connecting said apparatus to said equipment and connecting said impedance element in the line of the circuit to limit the magnitude of the current flowing through said compensating winding, and disconnecting said impedance element from the line of the circuit to detect the change in condition of said equipment.
Claim 14
Dependent Claim
206 words
Apparatus for detecting a change in condition in equipment, said apparatus comprising a magnetic core; a control winding wound on said core and connected in a line of a circuit having a current which varies in accordance with a change of conditiOn of the equipment for detecting the line current and producing a magnetic field in acordance with said line current; a compensating winding wound on said core for producing a magnetic field opposite to the magnetic field produced by said control winding; a drive winding wound on said core; drive means connected to said drive winding for supplying drive current to said drive winding to produce a magnetic field in said drive winding; a sense winding wound on said core for sensing the magnetic condition of said core; an impedance element having an impedance equivalent to a variation of impedance of the equipment, the impedance of said impedance element limiting said line current; and connecting means connecting said apparatus to said equipment and connecting said impedance element in the line of the circuit to limit the magnitude of the current flowing through said compensating winding, and disconnecting said impedance element from the line of the circuit to detect the change in condition of said equipment.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |