US2636097A

US2636097A - Safety fuse and adaptor plug for electrical appliances

Info

Publication number: US2636097A
Application number: US283434A
Authority: US
Inventors: Shapiro Hyman
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-04-21
Filing date: 1952-04-21
Publication date: 1953-04-21
Anticipated expiration: 1970-04-21

Description

NCES

H. SHAPIRO April 21, 1953 SAFETY FUSE AND ADAPTOR PLUG FOR ELECTRICAL APPLIA Filed April 21. 1952 INVEN TOR. HYMAN SHAPIRO Patented Apr. 21, 1953 OFFICE SAFETY FUSE AND ADAPTOR PLUG FOR ELECTRICAL APPLIANCES Hyman Shapiro, Brooklyn, N. Y. Application April 21, 1952, Serial No. 283,434

6 Claims.

This invention relates to new and useful improvements in safety fuses and adapters for electrical appliances.

More particularly, the present invention proposes the construction of an improved fuse hearing attachment plug having means to hold a replaceable fuse conveniently accessible for inspection and replacement and for protecting the circuit in case of a short circuit in the appliance which is connected in the circuit.

Another object of the present invention proposes forming the fuse bearing attachment plug so that a cover panel continually bears against the fuse holding it firmly in its socket clips.

Still further, the present invention proposes constructing the fuse bearing attachment plug so that the condition of a fuse can be seen without removing the plug.

The invention further proposes arranging the structure so that a fuse may be replaced in the plug without removing any more than a slidable cover.

For further comprehension of the invention and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, to the appended claims in which the various novel features of the invention are more particularly set forth.

On the accompanying drawings forming a material part of this disclosure:

Fig. l is a perspective view of an attachment plug constructed and arranged in accordance with the present invention, the cover panels being slid back and parts being broken away.

Fig. 2 is a side view of the plug with the fuse cover panel removed.

Fig. 3 is similar side view of the plug looking at the side opposite that shown in Fig. 2.

Fig. 4 is a sectional view taken on line t'% of Fig. 2 but with the fuse and cover panels removed.

Fig. 5 is a view similar to Fig. 4 but with the cover panels and fuse in place.

Fig. 6 is a perspective view similar to l but with the cover panels shown in place.

Fig. 7 is a rear end view of the plug.

Referring more particularly to the drawing, an attachment plug has a body 59 generally rectangular in shape and made of non-conducting material. ihe body has a front end i I and a rear end !2 with two opposed narrow side edge faces l 3 and it and wider flat top and bottom faces i5 and 0% respectively.

A pair of prongs l7 and i8, made of conducting material and adapted to insert in a wall outlet or the like. are fastened to the body at its front end H as by screws H) of conducting material. Cutout portions 28 and 2| in the front end H of the body may be made for attaching the prongs and later filled by blocks of insulating material (not shown).

The body it of the plug is provided with a recessed chamber 22 behind prong I1 and formed by a recess being made in the side edge face l3. This recess extends from the rear end i2 of the body to a short distance of the cutout portion 29 at the front end of the body. The recess or chamber 22 has opposed

side walls

23 and 24 and a back wall 25.

A pair of spaced

retainer clips

26 and 27 are located in chamber 22 and fastened to back wall as by

screws

28 and 29. The retainer clips are adapted to hold a fuse having terminal ends 3i and 32 separated by a fuse strip 33 enclosed in a glass tube 36 (see 2). This fuse strip should not be less than 8 amperes.

The clips are spaced so that clip 25 is adapted to receive and removably hold terminal end iii of the fuse and clip 23' the terminal end 32.

A conductor element or strip 35 is positioned behind clip 2'! when the clip is made of conducting material (as shown) and is bent so that the end of the screw l9 holding prong I! to the body contacts it to connect one clip with one prong.

The other clip, 26, is connected with one wire 36 of an electrical appliancecorcl 3! as by a con" ductor plate 38, a screw 39 and a washer If desired, the clips 25 and 2'! may be made of non-conducting'material in which event screws 28 and 29 will be the conducting elements for the clips. I1" the clips themselves are of conducting material, their arms become the conducting elements for current to pass through the fuse.

The other side face 64 is provided with a similar but shallow recess M and in this recess a conducting strip 42 is attached to the body as by screws 53. The second wire. 44 of cord 37 is fastened to the rearward one ofthese screws. The conducting strip 62 is connected with prong 18 by the screw 4% holding this prong to the body, this screw extending into recess ii and contacting the conducting strip 42.

Sliding cover panels 45 and .45 are provided to cover the fuse chamberor recess 22 and the cppo site recess 4|, grooves 5'. and 28 (see Fig. are provided in the

opposed sidewalls

23 and 24 of the recess 22 slidably to receive cover panel :35. Similar grooves 49 and 50 (see Fig. 4) are provided in the opposite side walls of the recess fill. Preferably cover panel 45 has azclear trans:

parent portion 51 which is provided with a cam surface which lies adjacent the fuse clips and fuse when the panel is in place in its grooves, for producing a tight electrical contact.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. An attachment plug for electrical appliances comprising a rectangular body of non-conducting material, a pair of insertion prongs of conducting material fixed to the body at one end thereof, said body having a recess in one side forming a fuse chamber behind one of the prongs, a pair of spaced fuse retainer clips fastened to the body in the recess, a pair of spaced conducting elements one at the rear of each clip, one of the clips being adapted to hold one terminal end of a fuse against its conducting element and the other clip adapted to hold another terminal end of the fuse against its adjacent conducting element, means to connect one of said elements to one of the prongs and means to connect the other conducting element with one wire of an appliance cord and means in the body to connect the other prong with a second Wire of the cord, said body recess having opposed side walls and a back wall, said fuse clips being mounted on the back wall, means in the opposed side walls slidably to receive a cover panel, and a cover panel slidable in said means to cover the recess.

2. An attachment plug for electrical appliances comprising a rectangular body of non-conducting material, a pair of insertion prongs of conducting material fixed to the body at one end thereof, said body having a recess in one side forming a fuse chamber behind one of the prongs, a pair of spaced fuse retainer clips fastened to the body in the recess, a pair of spaced conducting elements one at the rear of each clip, one of the clips being adapted to hold one terminal end of a fuse against its conducting element and the other clip adapted to hold another terminal end of the fuse against its adjacent conducting element, means to connect one of said elements to one of the prongs and means to connect the other conducting element with one wire of an appliance cord and means in the body to connect the other prong with a second wire of the cord, said body recess having opposed side walls and a back wall, said fuse clips being mounted on the back wall, means in the opposed side walls slidably to receive a cover panel, and a cover panel slidable in said means to cover the recess, grooves in the side walls slidably to receive a cover panel, and a cover panel slidable in the grooves.

3. An attachment plug for electrical appliances comprising a rectangular body of non-conducting material, a pair of insertion prongs of conducting material fixed to the body at one end thereof, said body having a recess in one side forming a fuse chamber behind one of the prongs, a pair of spaced fuse retainer clips fastened to the body in the recess, a pair of spaced conducting elements one at the rear of each clip, one of the clips being adapted to hold one terminal end of a fuse against its conducting element and the other clip adapted to hold another terminal end of the fuse against its adjacent conducting ele- 4 ment, means to connect one of said elements to one of the prongs and means to connect the other conducting element with one wire of an appliance cord and means in the body to connect the other prong with a second wire of the cord, said body recess having opposed side walls and a back wall, said fuse clips being mounted on the back wall, means in the opposed side walls slidably to receive a cover panel, and a cover panel slidable in said means to cover the recess, grooves in the side walls slidably to receive a cover panel, and a cover panel slidable in the grooves, said grooves being spaced from the back wall to position the cover panel against a fuse in the clips when the terminal ends of the fuse are firmly in contact with the conducting elements.

4. An attachment plug for electrical appliances comprising a body of insulating material, insertion prongs of conducting material fastened to the body, said body having a recessed chamber behind one of the prongs, spaced retaining conductor clips in the chamber fastened to the body, one of said clips adapted to receive and removably hold one terminal end of a fuse and the other clip adapted to hold another terminal end of the fuse, a conductor element connecting one clip and one prong, means associated with the other clip to connect it with one wire of an appliance cord and means to connect the other prong with a second wire of the cord, said body being rectangular in shape having two opposed narrow side edge faces, the chamber being in one of these faces, said chamber having opposed side walls and a back wall, grooves in the side walls slidably to receive a cover panel, a cover panel of non-conductive material slidable in the grooves, said grooves being spaced from the back wall to position the cover panel against a fuse in the clips when the terminal ends of the fuse are firmly in contact with the conducting elements.

5. An attachment plug for electrical appliances comprising a body of insulating material, insertion prongs of conducting material fastened to the body, said body having a recessed chamber behind one of the prongs, spaced retaining conductor clips in the chamber fastened to the body, one of said clips adapted to receive and removably hold one terminal end of a fuse and the other clip adapted to hold another terminal end of the fuse, a conductor element connecting one clip and one prong, means associated with the other clip to connect it with one wire of an appliance cord and means to connect the other prong with a second wire of the cord, said body being rectangular in shape having two opposed narrow side edge faces, the chamber being in one of these faces, said chamber having opposed side walls and a back wall, grooves in the side walls slidably to receive a cover panel, a cover panel of non-conductive material slidable in the grooves, said grooves being spaced from the back wall to position the cover panel against a fuse in the clips when the terminal ends of the fuse are firmly in contact with the conducting elements, said cover panel having a transparent portion adjacent the fuse clips when the panel is in place in the grooves.

6. An attachment plug for electrical appliances comprising a body of insulating material, insertion prongs of conducting material fastened to the body, said body having a recessed chamber behind one of the prongs, spaced retaining conductor clips in the chamber fastened to the body, one of said clips adapted to receive and removably hold one terminal end of a fuse and the other clip adapted to hold another terminal end of the fuse, a conductor element connecting one clip and one prong, means associated with the other clip to connect it with one wire of an appliance cord and means to connect the other prong with a second wire of the cord, said body being rectangular in shape having two opposed narrow side edge faces, the chamber being in one of these faces, said chamber having opposed side walls and a back wall, grooves in the side walls slidably to receive a cover panel, a cover panel of non-conductive material slidable in the grooves, said grooves being spaced from the back wall to position the cover panel against a fuse in the clips when the terminal ends of the fuse 6 are firmly in contact with the conducting elements, said cover panel having a transparent portion adjacent the fuse clips when the panel is in place in the grooves, said transparent portion including a cam surface which lies adjacent the fuse clips and fuse when the panel is in place in its grooves for producing a tight electrical contact.

HYMAN SHAPIRO.

References Cited in the file of this patent UNITED STATES PATENTS Number