US4855719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical receptable alarm switch
Assignee: HERMETIC SWITCH Inc A CORP OF OKLAHOMA
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Filing: 1987-02-17
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Granted: 1989-08-08
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Expires: 2007-02-17
Abstract
Abstract A power receptacle with alarm switch that is actuatable by a standard grounded three-prong plug to output a switch indication. The device consists of at least one three-prong receptacle wherein the third prong contact assures a common or ground connection upon insertion of a three-prong plug. A switch device is secured on the receptacle to extend an actuating arm adjacent the third prong hole in interfering position such that insertion and removal of the plug causes the third prong to move the actuating arm and produce a characteristic switch indication. An improved form of alarm switch uses a hermetically sealed magnetic switch in association with a spring-loaded plunger/magnet assembly to provide corrosion-proof switching.
Inventors
- 👤 William T. Posey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:51
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/1409; G08B13/149
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
An alternating current receptacle for receiving connection of at least one plural prong plug, comprising: housing means having at least one plural point array of contact holes for receiving a respective plug therein; plural contact means disposed in said housing means as secured in prong contacting relationship adjacent respective contact holes; a magnetic reed switch having alarm output connections secured to said housing means; a spring-loaded magnetic slug disposed adjacent the reed switch which is movable between the balanced and unbalanced flux condition relative to said reed switch thereby to actuate said switch between open and closed positions; and means positionable upon complete insertion of a plug to urge said magnetic slug to a position that actuates said magnetic reed switch and initiates an output switch indication from said switch means.
Claim 2
Dependent Claim
131 words
An alternating current receptacle for receiving connection of at least one plural prong plug, comprising: housing means having at least one plural point array of contact holes for receiving a respective plug therein; plural contact means disposed in said housing means as secured in prong contacting relationship adjacent respective contact holes; a magnetic reed switch having alarm output connections secured to said housing means; a spring-loaded magnetic slug disposed adjacent the reed switch which is movable between the balanced and unbalanced flux condition relative to said reed switch thereby to actuate said switch between open and closed positions; and means positionable upon complete insertion of a plug to urge said magnetic slug to a position that actuates said magnetic reed switch and initiates an output switch indication from said switch means.
Claim 3
Dependent Claim
18 words
Apparatus as set forth in claim 1 wherein said means positionable comprises: a selected prong of said plug.
Claim 4
Dependent Claim
31 words
Apparatus as set forth in claim 1 wherein said means positionable comprises: a push rod slidably disposed through said housing means and longitudinally movable by said plug to urge said actuation.
Claim 5
Dependent Claim
17 words
Apparatus as set forth in claim 1 wherein: said magnetic reed switch is hermetically sealed in glass.
Claim 6
Dependent Claim
58 words
Apparatus as set forth in claim 2 which further includes: a switch housing defining first and second parallel adjacent channels with said magnetic reed switch secured in the first channel and said magnetic slug movably disposed in the second channel; and a spring disposed in said second channel normally urging said magnetic slug toward the unbalanced flux condition.
Claim 7
Dependent Claim
23 words
Apparatus as set forth in claim 5 wherein: said first channel is filled with potting compound to seal over said magnetic reed switch.
Claim 8
Dependent Claim
17 words
Apparatus as set forth in claim 5 wherein: said magnetic reed switch is hermetically sealed in glass.
Claim 9
Dependent Claim
23 words
Apparatus as set forth in claim 7 wherein: said first channel is filled with potting compound to seal over said magnetic reed switch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |