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Publication numberUS3218413 A
Publication typeGrant
Publication dateNov 16, 1965
Filing dateOct 26, 1964
Priority dateOct 26, 1964
Publication numberUS 3218413 A, US 3218413A, US-A-3218413, US3218413 A, US3218413A
InventorsRudolf Koch
Original AssigneeRudolf Koch
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fused connecting plug having fuses which can be removed without dis-assembly of the housing and an indicating lamp for indicating a fuse disruption
US 3218413 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


An object of the present invention is to provide a small and compact fused plug, having electrodes or prongs extending from one end for insertion in a multiple outlet between other plug devices and having sockets for receiving the prongs of another plug.

It is a further object of this invention to provide such a small and compact fused plug having internally mounted fuses which can be readily and easily inserted and removed without disassembly of the outer body or hous- It is still a further object of the present invention to provide such a small and compact fused plug having integrated therein a small indicating lamp or the like for indicating disruption of one of the internal fuses.

The fused or In-Bee-Tween Plug is used between any appliance and a standard duplex receptacle or wall plug.

If a fused plug such as this is used in connection with an electric blanket, a set of Christmas tree lights, a dehumidifier or any such appliance that will remain unattended over long periods of time: you can be sure that if short circuits develop in the appliance there will be a much greater margin of safety because the In-Bee- Tween Plu=g is fused just above the current being used by the appliance itself.

irregularities which would not blow the larger line fuse would show up by a fuse being blown in the In-Bee- Tween Plug.

The In-BeeTween Plug has an indicator which lights up when a fuse is blown by the appliance. It is easily determined then which appliance is faulty. Naturally the line fuse is still in operation and service is continuous for other appliances being fed off the same circuit.

In this way faulty operation will be discovered earlier and the danger of fire from any particular appliance will be reduced.

The drawing furnished herewith illustrates a preferred construction of the present invention in which the above advantages and features as well as others are clearly shown and described.

In the drawing:

FIG. 1 is a perspective view of a fused plug constructed in accordance with the present invention with portions thereof broken away to show inner details of construction; and

FIG. 2 is a vertical section taken through the plug structure including the lamp'structure shown in FIG. 1.

Generally, the present invention is adapted to be employed as an intermediate plug to be connected into the usual well-known wall socket receptacle or the like, not shown. In the illustrated embodiment of the invention, the plug includes an outer two-piece molded housing 1 formed of a suitable electrical insulating material. Generally, the housing 1 as shown in FIG. 1 has a pair of parallel main walls joined around the periphery by a short side wall and selected to define a thickness which will be less than the space between the socket units of the conventional wall receptacle. Such wall receptacles are well-known devices which will be readily apparent to those skilled in the art and no further description or illustration thereof is given. An electroluminescent indicator 2 is mounted within the housing as more fully 3,218,413 Patented Nov. 16, 1965 ICC described hereinafter to provide an indication of the current carrying capacity of the fused plug. Generally, a pair of plug-type electrodes 3 and 4 have one end disposed within the housing and project outwardly in parallel spaced relation for insertion within the wall receptacle. The inner ends of the electrodes 3 and 4 are provided with suitable laterally bent portions and are clamped within a suitable recess within the two-piece housing. A pair of receiving socket electrodes 10 is secured in spaced alignment with the electrodes 3 and 4 and totally within the housing 1 with appropriate aligned receiving openings 11 provided in the side wall opposite that of the electrodes 3 and 4. The socket electrodes 14) are also clamped within the housing by the connection of the two-piece molded base or housing 1.

Each of the electrodes 3, 4 and 10 are constructed with similar U-shaped end fuse holders 7 each formed as an integral lateral bent lip portion immediately to one side of the electrode. The electrodes are mounted with the fuse holders 7 of the aligned and associated socket and plug electrodes lying along opposite sides of the housing 1. A conventional fuse 6 such as the well-known fuse sold by the trademark Buss type AGX5 or the like is disposed within the housing with the opposite contact ends within the respective fuse holders 7. The molded base 1 adjacent the plugs 3 and 4 is provided with an opening 5 somewhat larger than the diameter of a tubular fuse 6 for insertion of the fuse. The opposite end of the molded base 1 is provided with a small opening 9 aligned with the fuse and within which a plunger 8 formed of a suitable insulating material is slidably disposed. The fuse 6 can be removed by forcing of a suitable tool through the small opening 9 to push the plunger 8 inwardly and force the fuse 6 outwardly through the insert opening 5 to a degree that the end can be grasped; for example, by the persons fingers. A similar opening 12 is provided on the opposite end of the housing 1, which is of course symmetrically for-med.

The indicator 2 is held completely within the housing 1 such that the thin construction is maintained whereby the plug can be inserted in a multiple socket receptacle without interfering with the insertion of other conventional plugs. Preferably, the indicator 2 is of the wellknown electroluminescent variety and is only briefly described as having an outer glass or plastic window 13 forming the covering for a viewing opening in the housing 1. A transparent conductor 14 such as tin oxide is integrally formed on the inner surface of the glass with a suitable electroluminescent powder deposit 15 disposed between conductor 14 and a metallic conductor 16. Suitable spring contacts 17 are provided to the opposite surfaces and curl around upon a base insulator material 18 and spaced in accordance with the spacing between the corresponding plug electrode 3 and the corresponding socket electrode 11). In assembly, the indicator 2 is held within the housing 1 with the electrodes 1'7 clamped downwardly onto the members by the housing which is provided with an opening generally corresponding to the diameter of the glass or the like.

The present invention thus provides a highly satisfactory plug which can be inserted into the wall receptacle to provide separate fusing for the individual appliance connected through the socket electrodes of the plug 1. The plug of the present invention can fit between other plugs in multiple convenience outlets and does not require outside wiring or screws for interconnection of the appliance. The fuses are readily removed and replaced while maintained within the body. The indicator is built in to provide indication of unwanted circuit openings.

Various modes of carrying out the invention are contemplated as being within the scope of the following claims particularly pointing out and distinctly claiming the subject matter which is regarded as the invention.

I claim: 1. A fused connecting plug for insertion in one of the socket units of a multiple unit receptacle, comprising a fiat rectangular insulating housing having a pair of parallel main walls joined around the periphery by a short side wall to define a thickness less than the spacing between the socket units of a receptacle,

a pair of laterally spaced plug prongs secured within the housing and projecting outwardly through the side Wall,

a pair of correspondingly laterally spaced prong receiving sockets aligned with and spaced from the plug prongs, said housing having opening means aligned with the sockets for insertion of prongs into the sockets,

a fuse disposed to one side of an aligned prong and socket in said housing and connected thereto to complete the circuit therebetween, and

a thin lamp means mounted in the housing between the parallel main walls and spanning the aligned 4: prong and socket connected to the fuse and thereby being connected in parallel with the fuse and be ing illuminated upon disruption of the 'fuse, said housing having a viewing opening for detection of said illumination.

2. The fused connecting plug of claim 1, wherein said lamp means is an electroluminescent unit of a thin wafer type construction mounted parallel to the parallel main walls and having a pair of electrodes respectively engaging the aligned prong and socket.

References Cited by the Examiner UNITED STATES PATENTS 2,128,418 8/1938 LaMar a 200121 2,164,658 7/1939 Lyon 200-421 2,649,522 8/1953 Marcus 2001l5 2,988,617 6/1961 Graziosi 20()115 FOREIGN PATENTS 575,936 3/ 1946 Great Britain.

ROBERT K. SCHAEFER, Acting Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2128418 *Jul 16, 1936Aug 30, 1938La Mar Frank CIndicator
US2164658 *Jul 2, 1936Jul 4, 1939Lyon Leon PFuse indicator and puller
US2649522 *Jan 14, 1952Aug 18, 1953Marcus Max JFused electric connector
US2988617 *Jul 23, 1959Jun 13, 1961Michael GraziosiThree wire safety fuse adapter, grounding type
GB575936A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3610836 *Oct 30, 1968Oct 5, 1971Hitachi LtdDistribution frame for communication equipment
US3639882 *Apr 17, 1970Feb 1, 1972Honda Motor Co LtdFuse box apparatus for a motorcar
US3717836 *Apr 6, 1971Feb 20, 1973Micro Devices CorpElectrical outlet means and fuse therefor
US4052688 *Sep 27, 1976Oct 4, 1977Bell Telephone Laboratories, IncorporatedFuse clip assembly
US4275374 *Aug 20, 1979Jun 23, 1981Daniel ChaucerFuse-plug adapter for electrical cord
US4281322 *Sep 12, 1979Jul 28, 1981Nissan Motor Company, Ltd.Fuse blowing detector
US4300113 *Sep 6, 1979Nov 10, 1981Rene BronnenhuberFused electric plug
US4752243 *Jun 2, 1987Jun 21, 1988Noma Inc.Fuse plug
US4758184 *Sep 8, 1987Jul 19, 1988Wilson CallFused plug for electrical appliance cord
US5598138 *Jan 3, 1995Jan 28, 1997Jaronczyk, Jr.; Joseph P.Fault-indicating blade fuse
US5701118 *Feb 20, 1996Dec 23, 1997Hull; Harold L.Blown fuse indicator circuit and fuse cap, including a method of use therefore
US5874884 *Jul 21, 1997Feb 23, 1999Hull; Harold L.Blown fuse indicator circuit including a light housing containing a light source and method of use
US6482040Jun 1, 2000Nov 19, 2002Dennis L. BrooksElectrical systems using linear fusing
US6753755Feb 28, 2002Jun 22, 2004Safer Home, Inc.Electrical safety connector fuse
US7369029 *Apr 20, 2004May 6, 2008Cooper Technologies CompanyWireless communication fuse state indicator system and method
US7811115Oct 12, 2010Tyco Electronics CorporationConnector assembly with two stage latch
US7985098Aug 11, 2009Jul 26, 2011Tyco Electronics CorporationFuse connector assembly
US8109789Feb 7, 2012Tyco Electronics CorporationConnector assembly with strain relief
US8134445 *Mar 31, 2008Mar 13, 2012Cooper Technologies CompanyRFID open fuse indicator, system, and method
US8328581Nov 3, 2010Dec 11, 2012Tyco Electronics CorporationIn-line fused connector
US20050195547 *Jan 21, 2005Sep 8, 2005Shang-Lung HuangStructure of safety power adapter
US20050231320 *Apr 20, 2004Oct 20, 2005Ackermann John MWireless communication fuse state indicator system and method
US20080231410 *Mar 31, 2008Sep 25, 2008Frank Anthony DoljackRFID Open Fuse Indicator, System, and Method
US20100124834 *Aug 11, 2009May 20, 2010Tyco Electronics CorporationFuse connector assembly
US20100151721 *Dec 10, 2009Jun 17, 2010Tyco Electronics CorporationConnector assembly with strain relief
US20100255709 *Aug 11, 2009Oct 7, 2010Tyco Electronics CorporationConnector assembly with two stage latch
U.S. Classification337/197, 337/206, 337/213
International ClassificationH01H85/00, H01R13/68, H01H85/32
Cooperative ClassificationH01R13/68, H01H85/32
European ClassificationH01R13/68, H01H85/32