US2692316A - Combination safety fuse plug - Google Patents

Description

Oct. 19, 1954 M. GRAZIOSI 2,692,316

COMBINATION SAFETY FUSE PLUG Filed Jan. 4, 1952 4 5-55 5 &

INVENTOR. MIC/MEL GFflZ/OS/ Mum Patented Oct. 19, 1954 UNITED STATES PATENT OFFICE COMBINATION SAFETY FUSE PLUG Michael Graziosi, Jersey City, N. J.

Application January 4, 1952, Serial No. 264,918

2 Claims.

This invention relates to a combination safety fuse plug, and more particularly to a plug attachment for wall outlets, extension cords and the like containing independently replaceable fuse means therein.

It is an object of my invention to provide a novel, safety fuse plug of simple and economical construction for use with extension cords and the like in electrical connections.

Another object of this invention is to provide a fuse plug at the source of connecting use of electricity to eliminate the necessity of going to the main electric inlet whenever a fuse is blown.

A further object of the invention is to provide an efiicient, explosion proof fuse plug forming part of the connection with a source of electricity and to localize the searching of blown fuses for replacement thereof.

Still another object of my invention is to provide a well insulated, easily handled unitary fuse plug forming part of the prongconnections with a source of electricity in which the fuse members are segregated from each other and can be readily and easily replaced.

A specific object of this invention is to provide a plug used for extension cords and the like, that will give maximum safety from electrical overloads, grounds and short circuits, by having a fuse placed in each side of the line to correspond with the load or ampere rating of the appliance to be connected to the electric line so as to eliminate and protect against fire hazards in electrical appliances, connecting lamps, etc., from currents, taps, outlets and receptacles.

Other objects and novel features of my invention will become apparent from the following detailed description of my invention taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a front View of a preferred embodiment of my invention;

Fig. 2 is a side view of Fig. 1;

Fig. 3 is a sectional view taken on line 33 of Fig. 1;

Fig. 4 is a somewhat enlarged side view of the embodiment in Fig. 1 showing the interior of the embodiment having fuse clips in open condition, but without the fuse connection therein;

Fig. 5 is an opposite side view of Fig. 4 showing the fuse connection and fuse clips therein;

Fig. 6 is a sectional view taken on line 6-6 of Fig. 1; and

Fig. '7 is a fragmental sectional detailed view of a portion of the embodiment shown in Fig. 1.

Referring now more particularly to the drawings, in which similar reference characters denote like parts throughout, it will be noted that I provide a plug iii, showing a body member H and removable face pieces i2 and I3, respectively. The upper part of said body member I I is provided with an internally threaded opening M for the passage therethrough of an insulation tube [5, containing electric conductors I6 and H with terminals extending into the body member for connection. Said insulation tube 15 extends through an externally threaded bushing I8 which can be screwed in the openin 1d.

Body member Ii is made of any non-conducting insulating material such as Bakelite and the like and should be able to protect against shock, and the like. The body member is provided further with recesses 19 and 28 for said conductors l6 and ii, respectively. Said body member is also provided with a cross recess 2| and 22, respectively on each of its sides for accommodating a metal plate 23 and 24, respectively. Each of said plates accommodates a screw member 25 and 25, respectively, for holding said plates in position in the cross recesses 21 and 22, respectively. Said plates 23 and 24 are each provided with a screw 2'. and 28 respectively, for fixing the terminals of conductors i6 and H to the plates 23 and 24 respectively.

Mounted on said metal plates 23 and 24, is a swivel connecting member or clip 29 and 30, respectively. It will be noted that each of said swivel members can be rotated through from a horizontal to a vertical position as shown in Figs. 4 and 5 respectively.

Body member it is furthermore provided with a deep well 3| and 32 set on diagonally opposite sides of said body member H which extend toward the respective faces of the body as shown in Fig. 3. Extending or depending from body H are spaced prongs 33 and 34, each of which is fixed in the lower part of the body member by means of screws 35 and 36 respectively. Said prongs, it will be noted are substantially T shaped as seen, and are each provided with a connecting swivel plate or clip 3'1 and 38, respectively. The wells 3! and 32, as above indicated, are set deeply in said body member [I and are each adapted to accommodate a fuse member 39 and 40, respectively. Said fuses, as shown more clearly in Figs. 3 and 6, are bent to conform with the depth of the well and follow the outline thereof from upper swivel plate 29 to lower swivel plate 31, as shown in Figs. 4 to 6 inclusive.

Body member H is closed by means of face pieces 52 and i3 which are held against said memher In. A central threaded opening 4! extends through the center of the member for accommodating knob screws 42 and 43, respectively, for keeping face pieces [2 and I3 in position against the body member I I, as shown in Figs. 1, 2 and 6. Each of said face pieces is provided with an extension block 44 and 45, respectively, which are made also of insulated material and are adapted for fitting in the wells 3| and 32, respectively.

From the foregoing description, taken in conjunction with the accompanying drawing, it will be noted that I provide a safety fuse plug containing standard fuse elements of any desired ampere rating depending upon the appliance used. Furthermore, by my device I avoid the necessity of making an inspection throughout the house or wherever appliances are used by limiting the inspection to the connecting conduits of appliances to the source of electricity. I furthermore avoid the hazards of fire commonly caused by overloaded Wiring systems. In such cases, by the use of my device, the fuse element in the invention is burned out and the location of the trouble is localized whereupon the burned out fuse element or elements can be readily removed by operating the swivel plates and a new fuse element or elements inserted in either of the wells. It is apparent that no tools or special implements are required to make this change.

According to my invention the safety fuse plug can be used generally on all electric extension cord Wires. Furthermore, the body structure is composed of highly insulating material and there is no exposure of the metal members which may cause electric shocks.

While a preferred embodiment of my invention has herein been described and illustrated, it is to be understood that modifications as to form, arrangement of parts and use of materials may be made without departing from the spirit and scope of the invention as claimed.

1. An electrical plug of insulating material comprising a body member, conducting means for connecting inlet conductors thereto, said conducting means being fixed in recesses separated from one another by a portion of the body member, outlet prong means, said conducting means and outlet prong means being in communication with one another by diagonally opposite and longitudinally extending wells, fuse means in said wells connected to said conducting means and prong means and a detachable cover for each of said wells having an extension adapted to fit into the well to retain the fuse means in relatively rigid position.

2. An electrical plug of insulating material comprising a body member, conducting plates for connecting inlet conductors thereto, said conducting plates being fixed in cross recesses on each side of the body member and separated from one another by a portion of said body member, spaced outlet prongs, said conducting plates and outlet prongs being in communication with one another by diagonally opposite and longitudinally extending wells, a fuse strip in each well connected to a conducting plate and an outlet prong and a detachable cover for each of said wells having an extension adapted to fit into the well to retain the fuse strip in relatively rigid position.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,563,105 Pennington Nov. 24, 1925 2,030,016 McIntosh Feb. 4, 1936 2,406,154 Medlin Aug. 20, 1946 FOREIGN PATENTS Number Country Date 753,844 France Aug. 21, 1933 623,418 Germany Dec. 19, 1935

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