Patent US3829703A successfully refreshed from Google Patents.
US3829703A
Expired / Lapsed
US
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Power sensing and shut-off apparatus
Assignee: SENSORLOK CORP
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Filing: 1973-02-13
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Granted: 1974-08-13
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Expires: 1993-02-13
Abstract
Abstract Apparatus in a combination system utilizing electric and fluid power systems for driving equipment or machinery wherein all power systems are interrupted upon the failure or loss of any one power source. The apparatus will prevent the automatic reactivation of the driven equipment upon the reestablishment of power following a failure or loss of power. Shut-off of the multiple power systems can also be accomplished through a single switch either manually or automatically.
Inventors
- 👤 W Wilkie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:58
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
174 words
In a combination power system utilizing two separate power sources wherein the power is supplied through separate first and second conductor systems, at least the first of which is electrical, said first conductor system including electrical conductors for supplying electrical power, said second conductor system including electrically initiated means normally interrupting the power circuit of the second conductor system and responsive to electrical initiation to permit supply of power through said second power system, by-pass and holding circuit means operatively associated with said first and second systems and providing for a mutual dependence of said systems on each other, said by-pass and holding circuit means including selectively operable switch means operable to initiate supply of power through one of said systems, said by-pass and holding circuit means further including contact means movable to an open position in response to loss of power in said second conductor system, and means responsive to supply of power through one of said systems to provide for initiation of supply of power through the other one of said systems.
Claim 2
Dependent Claim
174 words
In a combination power system utilizing two separate power sources wherein the power is supplied through separate first and second conductor systems, at least the first of which is electrical, said first conductor system including electrical conductors for supplying electrical power, said second conductor system including electrically initiated means normally interrupting the power circuit of the second conductor system and responsive to electrical initiation to permit supply of power through said second power system, by-pass and holding circuit means operatively associated with said first and second systems and providing for a mutual dependence of said systems on each other, said by-pass and holding circuit means including selectively operable switch means operable to initiate supply of power through one of said systems, said by-pass and holding circuit means further including contact means movable to an open position in response to loss of power in said second conductor system, and means responsive to supply of power through one of said systems to provide for initiation of supply of power through the other one of said systems.
Claim 3
Dependent Claim
70 words
The combination power system defined in claim 1 further including electrically energizable means operable when energized to provide for supply of power through said conductors, said switch means being operatively associated with said electrically initiated means and said electrically energizable means so that in response to actuation of said switch means one of said electrical means is electrically energized to provide for supply of power to one of said systems.
Claim 4
Dependent Claim
72 words
The combination power system defined in claim 2 wherein said electrically energizable means is a relay that is energized in response to actuation of said switch means, said relay having a set of normally open contacts in circuit with said electrically initiated means providing for electrical initiation thereof in response to closing of said contacts and also providing for interruption of said second conductor system in the event said relay is de-energized.
Claim 5
Dependent Claim
45 words
The combination power system defined in claim 3, wherein said second conductor system supplies fluid under pressure, the power circuit of the second conductor system being a conduit for passage of the fluid, and said electrically initiated means includes a valve normally closing said conduit.
Claim 6
Dependent Claim
47 words
The combination power system defined in claim 4, wherein said contact means comprises a pressure switch responsive to pressure conditions in said conduit and connected to said relay so that when said pressure switch is open said relay is de-energized to thereby interrupt said first conductor system.
Claim 7
Dependent Claim
38 words
The combination power system defined in claim 5, wherein said by-pass and holding circuit means includes a by-pass circuit and a holding circuit, and said pressure switch is connected in said holding circuit in series with said relay.
Claim 8
Dependent Claim
29 words
The combination power system defined in claim 6, wherein said relay has a second set of normally open contacts connected in said holding circuit in series with said relay.
Claim 9
Dependent Claim
30 words
The combination power system defined in claim 7, wherein a normally closed interlock switch is electrically connected from a remote position with said relay for de-energizing said relay when opened.
Claim 10
Dependent Claim
23 words
The combination power system defined in claim 8, wherein said normally closed interlock switch is manually operable for movement to an open position.
Claim 11
Dependent Claim
31 words
The combination power system defined in claim 8, wherein said normally closed interlock switch includes a sensing means and is operable for movement to an open position by said sensing means.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |