US3792380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal switching arrangement
Assignee: NEC Corp
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Filing: 1973-01-11
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Granted: 1974-02-12
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Expires: 1993-01-11
Abstract
Abstract In a switching arrangement of the type having a plurality of coils simultaneously connected to a power source for causing movement of coil-associated switches, the addition of coil response time and release time adjusting means to control selective switching of two input signals to an output without incurring momentary signal interruption at the output. The response and release times are adjusted so that the switches associated with the signal to be connected to the output finish their movement before or at the same time as the start of movement of the switches associated with the signal to be disconnected from the output. The energization response time of each switch controlling relay coil is controlled by a variable resistance in series between the energizing source of power and the relay coil. The de-energization release time of each switch controlling relay coil is controlled by a variable resistance in parallel with said relay coil.
Inventors
- 👤 M Murotani
- 👤 T Yano
- 👤 K Koyama
- 👤 T Motojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:30
CPC Classifications
H; H01; H01H; H01H47/00; H04; H04B; H04B1/00; H04B1/74
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
In a signal switching arrangement having a driving circuit of a plurality of electromagnetic relays for selectively connecting one of two input circuits to one output terminal, a signal switching arrangement comprising a plurality of first variable impedance elements connected in series with a driving winding of each said relay, respectively, and a plurality of second variable impedance elements connected in parallel with each said relay, respectively, wherein said first and second variable impedance elements permit separate adjustment so as to control the response time of each said relay and to avoid the possible momentary Interruption of a signal at said output terminal at the time of switchover. CM,2Gnal switching arrangement according to claim 1, wherein said plurality of relays comprise bridge-type and non-bridge-type relays, so combined as to avoid a variation in the output level of transmission signals at time of switchover.
Claim 2
Dependent Claim
156 words
A switching circuit comprising, a first through fourth single pole double throw switches energized respectively by first through fourth relay coils, b said first and second switches being connected in series through their respective make contacts between a first input terminal and an output terminal, when said first and second relay coils are de-energized, c said third and fourth switches being connected in series through their make contacts between a second input terminal and said output terminal, when said third and fourth relay coils are energized, d a power source adapted to be switchably connected in parallel to said first through said fourth relay coils, and e means connected to said relay coils for adjusting the relative response times of said relay coils to energization and de-energization to insure that the relays controlling switches moving from make to break positions don''t begin movement until the swithces moving from break to make position have completed this motion.
Claim 3
Dependent Claim
156 words
A switching circuit comprising, a first through fourth single pole double throw switches energized respectively by first through fourth relay coils, b said first and second switches being connected in series through their respective make contacts between a first input terminal and an output terminal, when said first and second relay coils are de-energized, c said third and fourth switches being connected in series through their make contacts between a second input terminal and said output terminal, when said third and fourth relay coils are energized, d a power source adapted to be switchably connected in parallel to said first through said fourth relay coils, and e means connected to said relay coils for adjusting the relative response times of said relay coils to energization and de-energization to insure that the relays controlling switches moving from make to break positions don''t begin movement until the swithces moving from break to make position have completed this motion.
Claim 4
Dependent Claim
54 words
A switching arrangement as claimed in claim 3 wherein said means for adjusting comprises, a first through fourth means for individually adjusting the energization response time of said first through fourth relay coils respectively and b first through fourth means for individually adjusting the release time of said first through fourth relay coils respectively.
Claim 5
Dependent Claim
40 words
A switching arrangement as claimed in claim 4 further comprising means connecting the break contacts of said second and fourth swithces to ground and individual resistors connected between the break contacts of said first and third switches, respectively, and ground.
Claim 6
Dependent Claim
90 words
A switching arrangement as claimed in claim 5 wherein said first switch is a bridge switch of the type which contacts both the make and break terminals simultaneously during movement from one terminal to the other, and wherein the first means for adjusting the energization response time of the first relay coil is set to cause said first switch to complete movement from make to break position after the make-to-break movement of said second switch and substantially simultaneously with the start of make-to-break movement of said first and second switches.
Claim 7
Dependent Claim
71 words
A switching arrangement as claimed in claim 6 wherein said first through fourth means for adjusting energization response times comprises first through fourth variable series resistors connected in series, respectively, with said first through fourth relay coils and said power source, and further wherein said first through fourth means for adjusting release times comprises first through fourth variable parallel resistors connected in parallel, respectively, with said first through fourth relay coils.
References Cited (Backward Citations)
US3422279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |