US3748540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing and monitoring system for redundant trip devices
Assignee: General Electric Co
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Filing: 1971-09-02
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Granted: 1973-07-24
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Expires: 1991-09-02
Abstract
Abstract Three or more pressure switches, each having two or more actuated contacts are connected together in a logic circuit with monitoring devices to detect contact failure so as to provide protection to the system while each pressure switch is tested while providing redundancy so that the probability of a trip action not to occur when it should is minimized. Although the principle of operation is illustrated using a pressure sensing trip system as an example, it is broadly applicable to any type of redundant, testable protective system.
Inventors
- 👤 M Eggenberger
- 👤 C Devlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:05
CPC Classifications
F; F15; F15B; F15B19/00; F15B19/005; F15C; F15C4/00; G; G05; G05B; G05B9/00; G05B9/02; H; H01; H01H; H01H47/00; H01H47/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
In a protection system for detecting variation in a sensed condition of an operating system and taking action to protect said operating system, the combination of: a plurality s of actuators responsive to said sensed condition, a plurality of actuated devices grOuped in sets of n, each set operatively connected to one of said actuators, n being smaller than s, a plurality of first logical means each having a plurality of n inputs from said actuated devices, and second logical means of a complementary type having an output from each of said first means connected as an input thereto, said second means output being operatively connected to means for protecting said operating system, wherein said first means comprise s logical AND means each with n inputs and wherein said second means is a logical OR with s inputs.
Claim 2
Dependent Claim
138 words
In a protection system for detecting variation in a sensed condition of an operating system and taking action to protect said operating system, the combination of: a plurality s of actuators responsive to said sensed condition, a plurality of actuated devices grOuped in sets of n, each set operatively connected to one of said actuators, n being smaller than s, a plurality of first logical means each having a plurality of n inputs from said actuated devices, and second logical means of a complementary type having an output from each of said first means connected as an input thereto, said second means output being operatively connected to means for protecting said operating system, wherein said first means comprise s logical AND means each with n inputs and wherein said second means is a logical OR with s inputs.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |