US3717863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch position supervising device
Assignee: US Philips Corp
•
Filing: 1971-10-19
•
Granted: 1973-02-20
•
Expires: 1991-10-19
Abstract
Abstract A device for the electronic supervision of a number of switching devices, each of which is connected to one side of a load, the other side of the loads being connected to a further switching device which is constructed as a controlled rectifier. After a starting pulse, the controlled rectifier receives an extinguishing pulse of a given value which can bring the controlled rectifier to the non-conducting state only if the current flowing through the rectifier due to the non-conducting state of all other switching devices has reached a given minimum value. If at least one of the said number of switching devices has remained conducting, the controlled rectifier continues to carry current, said current being detected, thus causing an alarm.
Inventors
- 👤 Kempen D Van
- 👤 H Spaargaren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:47
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73; G; G06; G06K; G06K15/00; H03K3/00; H03K3/02; H03K3/35; H03K3/352; H01; H01H; H01H9/00; H01H9/16; H01H9/167
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
A device for the electronic supervision of at least one first switching device which is connected to one side of a load, the other side of said load being connected to a further switching device for connecting a supply source, the at least first switching device having to be open when the further switching device is opened, characterized in that the further switching device is a controlled rectifier (CR) which, after having been rendered conducting by a starting pulse (St), can be rendered non-conducting by an extinguishing pulse (Df) of a given value only if the current (I) flowing through the controlled rectifier (CR) due to the fact that said at least first switching device (S1, S2 . . . Sn) is non-conducting has a given minimum value (I1), a detector (3) being provided in which, in the case that after said extinguishing pulse (Df) the controlled rectifier (CR) remains conducting due to the conducting state of a said at least first switching device (S1, S2 . . . Sn), the current (I2, I3) flowing through the controlled rectifier (CR) can be detected for an alarm (A remains zero).
Claim 2
Independent Claim
189 words
A device for the electronic supervision of at least one first switching device which is connected to one side of a load, the other side of said load being connected to a further switching device for connecting a supply source, the at least first switching device having to be open when the further switching device is opened, characterized in that the further switching device is a controlled rectifier (CR) which, after having been rendered conducting by a starting pulse (St), can be rendered non-conducting by an extinguishing pulse (Df) of a given value only if the current (I) flowing through the controlled rectifier (CR) due to the fact that said at least first switching device (S1, S2 . . . Sn) is non-conducting has a given minimum value (I1), a detector (3) being provided in which, in the case that after said extinguishing pulse (Df) the controlled rectifier (CR) remains conducting due to the conducting state of a said at least first switching device (S1, S2 . . . Sn), the current (I2, I3) flowing through the controlled rectifier (CR) can be detected for an alarm (A remains zero).
Claim 3
Independent Claim
189 words
A device for the electronic supervision of at least one first switching device which is connected to one side of a load, the other side of said load being connected to a further switching device for connecting a supply source, the at least first switching device having to be open when the further switching device is opened, characterized in that the further switching device is a controlled rectifier (CR) which, after having been rendered conducting by a starting pulse (St), can be rendered non-conducting by an extinguishing pulse (Df) of a given value only if the current (I) flowing through the controlled rectifier (CR) due to the fact that said at least first switching device (S1, S2 . . . Sn) is non-conducting has a given minimum value (I1), a detector (3) being provided in which, in the case that after said extinguishing pulse (Df) the controlled rectifier (CR) remains conducting due to the conducting state of a said at least first switching device (S1, S2 . . . Sn), the current (I2, I3) flowing through the controlled rectifier (CR) can be detected for an alarm (A remains zero).
Claim 4
Independent Claim
189 words
A device for the electronic supervision of at least one first switching device which is connected to one side of a load, the other side of said load being connected to a further switching device for connecting a supply source, the at least first switching device having to be open when the further switching device is opened, characterized in that the further switching device is a controlled rectifier (CR) which, after having been rendered conducting by a starting pulse (St), can be rendered non-conducting by an extinguishing pulse (Df) of a given value only if the current (I) flowing through the controlled rectifier (CR) due to the fact that said at least first switching device (S1, S2 . . . Sn) is non-conducting has a given minimum value (I1), a detector (3) being provided in which, in the case that after said extinguishing pulse (Df) the controlled rectifier (CR) remains conducting due to the conducting state of a said at least first switching device (S1, S2 . . . Sn), the current (I2, I3) flowing through the controlled rectifier (CR) can be detected for an alarm (A remains zero).
References Cited (Backward Citations)
US1931862A
Cited
US2129143A
Cited
US2459186A
Cited
US2701965A
Cited
US3215996A
Cited
US3508077A
Cited
US3524179A
Cited
US3548398A
Cited
US3662372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |