US3092695A

US3092695A - Night light with swivel electrical connector

Info

Publication number: US3092695A
Application number: US49070A
Authority: US
Inventors: Abrams Ralph
Original assignee: Cable Electric Products Inc
Current assignee: Cable Electric Products Inc
Priority date: 1960-08-11
Filing date: 1960-08-11
Publication date: 1963-06-04
Anticipated expiration: 1980-06-04

Description

NIGHT LIGHT WITH SWIVEL ELECTRICAL CONNECTOR 2 Sheets-Sheet 1 Llmlllln l l III R. ABRAMS June 4, 1963 Filed Aug. 11, 1960 INVENTOR. ABRAMS g i sulfa:

RALPH ATTORNEY W 5 5 a w F w 2 Ea- IE 2 2 w r x w a 0 a 5m June 4, 1963 R. ABRAMS 3,092,695

NIGHT LIGHT WITH SWIVEL ELECTRICAL CONNECTOR Filed Aug. 11, 1960 2 Sheets-Sheet 2 INVENTOR. R ALPH ABRAMS BY I ATTO R N EY 3,992,695 NIGHT LIGHT WITH SWIVEL ELECTRICAL CGNNECTGR Ralph Abrams, Sharon, Mass, assignor to Cable Electrrc Products, Inc., Providence, R.I., a corporation of Rhode Island Filed Aug. 11, 195i), Ser. No. 49,070 7 Claims. (Cl. 206-51) My present invention relates to the electrical art and more particularly to a novel construction of an auxiliary mght light.

The principal object of the present invention is to provide a small night light having a minimum number of easily assembled parts.

A further object of the present invention is to provide a n1ght light which can be swiveled 90 degrees without disturbing the electrical contact.

Another object of the present invention is to provide a night light construction having readily stamped parts which can be assembled without the use of screws, soldering or other means.

With the above and other objects and advantageous features in view my invention consists of a novel arrangement of parts more fully disclosed in the detailed description following in conjunction with the accompanying drawings and more particularly defined in the appended claims.

In the drawings,

FIG. 1 is a perspective view of a night light embodying my mvention.

FIG. 2 is an enlarged section taken on line 22 on FIG. 1.

FIG. 2A is a perspective view of one of the internal contact elements.

FIG. 3 is a front elevation of the light.

FIG. 4 is an enlarged elevation with the external contact elements removed.

FIG. 5 is a perspective view of the external contact element mounting.

FIG. 6 is a perspective view of one of the external contact elements.

FIG. 7 is a perspective view of another form of night light embodying my invention.

FIG. 8 is an enlarged section taken on line 8-3 on FIG. 7.

FIG. 8A is a perspective view illustrating the operation of the switch.

FIG. 9 is a front elevation of the night light shown in FIG. 7.

FIG. 10 is an exploded perspective view of the various contact elements.

It has been desirable to provide a small night light which can be plugged into the auxiliary receptacle of a conventional light or even into a wall receptacle. These night lights use tiny bulbs with very little current to provide a small illumination at night in desired areas. The parts are necessarily small and besides a pair of electrical contact elements a socket must be provided for the bulb with suitable electrical connections and a switch must be provided for turning the light on and off. For the service it performs it is desirable that the light be sold as cheaply as possible. The present invention therefore provides an efficient night light in which the various elements thereof can be assembled without the use of screws or soldering making for rapid and easy assembly of stamped parts and in which the entire night light assembly including the housing can be held together with one or two small screws. Furthermore, the night light of the present invention can additionally be provided with means which permit the light to be swiveled 3,092,695 Patented June 4, 1963 degrees so that the light can be positioned at any desired angle regardless of the position of the receptacle slots.

Referring more in detail to the drawings, FIGS. 1 to 6 inclusive illustrate the night light of the present invention having a swivel feature. The night light comprises a housing 20 which can be molded of any suitable dielectric material such as a plastic material having a small bulb 21 screwed into a socket portion of the housing. A pair of contact elements 22 extend laterally at right angles to the bulb, and an operating switch 23 for turning the light on and off extends from the housing opposite the contact elements 22.

Now viewing FIG. 2, the housing 20 comprises a lower portion 24, an upper portion 25 and the contact element holding disc 26. When the

portions

24 and 25 are placed one over the other as shown in FIG. 2, an annular socket portion 27 is formed to the right having internal threads 28 and a groove 29 at the upper edge extending from within the threaded portion 28 rearwardly, and terminating in a recess 30 extending behind the socket portion 27. The socket portion 27 may also be provided with an external annular groove 31 for the attachment of a shade if desired. The central portion of the housing is provided with a large recess 32 behind the recess 30 separated by a wall 33. The upper housing member 25 is provided with a short extending portion 34 at right angles to the socket portion 27 having a recess 35 which is closed by the disc 26.

The operating portions of the electrical system are designed to fit into the housing with a minimum of assembly effort. Each contact element 22 is formed as shown in FIGS. 2, 5 and 6. It comprises a straight contact portion 36 folded at its thrust end and then bent outwardly to form a spring contact portion 37. The inner end is bent at right angles and at an angle to the axis of the contact element to form a contact shoe 38 which is cut away at 39 as shown in FIGS. 5 and 6.

The disc 26 is provided with a pair of slots 40. The contact elements 22 are pushed through the slots 40 into the position shown in FIG. 2. As they are pushed through the slots the spring contact portions 37 are squeezed inwardly until they reach the outer portion of the slot and then they spring outwardly into the position shown in FIG. 2 so that they bear against a shoulder in the outer surface of the disc 26. This locks the con-tact elements in place. Viewing FIG. 5 the cut away portions 39 define a central spaced area between the contact elements. A dielectric bushing 41 extends from beneath the disc 26 and a swivel post 42 is pushed through a central opening in the disc 26 through the bushing 41. A washer 43 is positioned between the head of the post and the outer surface of the disc 26. The lower end of the post threadedly engages the upper housing portion 25 at 44. With this mounting the disc 26 holding the contact elemerrts 22 in spaced parallel relation can swivel around the post 42.

Viewing FIGS. 4 and 5, the disc 26 is provided with a flange 45 having a depending integral stop member 46. The central bushing 41 is provided at diametrically opposite sides with hearing portions 47 slightly shorter than the bushing 41. The recess 35 is provided at its bottom with oppositely disposed slightly raised portions 48. When the disc 26 is inverted from the position shown in FIG. 5 and placed over the recess 35 as shown in FIG. 4 the bearing portions 47 will ride on the raised portions 48 and the stop element 46 will be positioned as shown in dotted lines in FIG. 4 in a quadrant opposite the socket portion 27. The raised portions 48 act as a step beyond which the element 46 cannot rotate. This is equivalent to a 90 degree swing. This permits the disc 26 carrying 3 the contact blades 22 to rotate through a 90 degree angle. In order to ensure the continuity of electrical contact, this angle must be limited to 90 degrees.

Viewing FIG. 2, the contact element 22 to the right is electrically connected to the threaded portion of the socket 28 for electrical contact with the threaded portion of the bulb 21. This electrical connection is made through a contact element 49 illustrated in FIG. 2A. The contact element 49 comprises a flat stamping having a wide upper portion 50 and a narrow lower portion 51. The wide upper portion is provided with a central upstanding post 52 having spaced lugs 53 at each side edge. The upper portion 50 is also provided'with forwardly extending lugs 54 extending at right angles from the lower edge of the portion 59. The narrow portion 51 extends downwardly and then outwardly terminating in an upturned end 55. Referring to FIGS. 2 and 4 the element 49 is pushed through a slot in the upper housing portion 25 until the lugs 54 abut the upper wall -of the recess 30. The lugs 53 are then forced outwardly so that they swedge over the bottom wall of the recess 35 as shown in FIG. 4. This locks 'the element 49 in position. It will be noted that the narrow portion 51 extends over the groove 29 so that it'has a resilient action in the path of movement of the bulb 21. A coil spring 56 of conductive material is now positionedover the post 52 of the contact element 49 with the bottom of the spring resting on the portion 59 and the upper end of the spring bearing against the shoe 38 of the contact blade 22. The electric current is thus transmitted through the: right contact blade shown in FIG. 2, through the spring 56, through the contact element 49 and portion 51 to the side of the bulb base 21.

The other electrical contact must be made with the bottom center portion of the bulb 21. The path of current between this point and the left contact blade 22 is controlled'by-the switch 23. A small contact member-57 V is mounted abovethe housing wall '33 in the upper portion 25 of the housing. Thecontact member--57 'is-shaped as shown in FIG. 2. It comprises a's'p'ring portion 58 in the recess 30 in axial alignment with the socket portion 27 so as to receive the bottom of the bulb 21. The portion 58 is bent into "an inverted U-shape with the inside arm bearing against the short wall portion in the upper housing portion 25. This short arm portion is bent around and up the inner side of this wall portion at 59 and terminates in a horizontal contact end 60 in the upper right hand portion of the recess 32. It will be noted that the wall 33 of the lower housing portion 24 bears against the portion 59 of this contact member to lock it in position. A Z-shaped flat contact member 61 is mounted in the upper left portion of the recess 32. The upper end of the member 61 is constructed identical with the upper portion of the contact element 49. It is provided with a central post 62, swedged lugs 63, see FIG. 4, and a coil spring 64 on the post 62 which contacts the surface 38 of the left contact blade 22. Theintermediate horizontal portion of the member 61 bears against the upper Wall of the recess 32 to lock the contact element 61 to the housing. The lower verticalportion 65 of the element 61 extends downwardly into the recess 32 terminating at a point opposite the contact area 60 of the member '57.

The gap between the

contact portions

60 and 65 is controlled by the switch 23. The switch 23 comprises a solid cylindrical'dielectric portion 66 having a collar 67. The lower housing portion 24 is provided with an opening 68 leading to the recess 32. The cylindrical portion 66 extends downwardly through the opening 68 with the collar 67 resting on shoulders 69 in the recess. The cylindrical portion 66 is provided at its upper end with a central opening 70 and an upwardly extending hollow portion 71 slot-ted across a diameter at 72. A coil spring 73 is positioned in the opening 70. A T-shaped contact member 74-is mounted with its vertical leg extending into the coil spring 73 and its horizontal arms riding in the slot 72. As can be seen in FIG. 2 the horizontal arms are yieldingly held against the contact portions so and 65 to close the electrical contact. Turning movement of the switch 23 will thus open or close the electrical contact between the

members

60 and 65. The two

portions

24 and 25 of the housing may be held together by one or more screws 75 as shown in FIG. 4.

With the parts thus assembled a bulb 21 is threaded into the socket 27 with one element of the bulb contacting the spring portion 58 of the member 57 and the other element of the bulb contacting the member 51. The device as shown in FIG. 1 can now be pushed into a conventional electrical receptacle. The light can be turned on or oh? by the rotation of the switch 2311s hereinabove described. However, the housing can be rotated degrees as shown in dotted lines in FIG. '3 to change the position of the bulb without afiecting the electrical contact. As the housing is rotated the contact elements 22 mounted in the disc 26 are held in fixed position by the wall receptacle. The

contact members

49 and 61 also rotate. However, electrical contact between these members and the contact blades 22 is made through springs 56 :and 64 which are resiliently resting on the portions 38 of the contact blades as positioned in FIG. 5. Since these portions 38 each extend over more than one fourth the circumference of a circle the

springs

56 and 64 maintain electrical contact with these portions while they are sliding along. This permits a swivel move ment through 90 degrees without breaking contact.

In the form shown in FIGS. 7 to 10 inclusive the swivel feature of the light has been omitted. In this form the dielectric housing comprises a lower portion 76 and an upper portion 77 as viewed in FIG. 8.- To the right is an internally threaded socket portion 78 as in the previous form. Behind the socket portion 73 is a narrow recess 79 having a wall 30 which separates it from the large recess 81. The contact portion 32 extends at right angles to the socket portion 78. The contact elements are constructed as shown in FIG 10. The right contact element 83 comprises a flat elongated contact portion reentrantly bent at the thrust end and terminating in an outwardly angled spring contact portion 84 The lower end of the contact portion 83 is provided with two spaced short lugs 85 extending at right angles thereto and a central elongated contact member 86 extending laterally at a downward angle and terminating in a bent portion 87. The blade 83 is pushed through a slot in the upper portion of the housing extending from the recess 79 into the contact portion 82. The blade; 33 is pushed into the slot until the lugs 85 abut the upper wall of the recess as shown in FIG. 8. At this point the spring portion 84, which has been compressed, springs outwardly over a shoulder 88 to lock the blade 83 in position. It be noted that the portion 86 now extends over a groove in the threaded portion of the socket 78 similarly to the construction shown in PEG. 2. The left contact blade 85 comprises a flat elongated contact portion also bent at its thrust end and terminating in the spring portion 90. The lower end is provided with an integral horizontal strip 91 terminating in a depending contact portion 92. The blade 8% is also pushed'through a slot in the contact portion 82 of the housing until the horizontal portion 91 abuts the upper wall of the recess 81 and the spring contact portion 96 springs outwardly to lock over a shoulder 93.

A contact member 94 is provided similar to the member 57 in FIG. 2. It is provided with the spring portion 95 which is an axial alignment with the socket 78 to contact the bottom of the bulb. The U-bend 96 is wrapped around the bottom of the separating wall and held in place by the Wall portion 80 between the recesses 79 and between the portion 92 of the contact blades 89 and the portion 97 of the member 94 is controlled by a switch 98 identical to the switch 23 in FIG. 2. It comprises a cylindrical portion 99 held in place by a collar 100 resting on shoulders in the housing. A spring 101 is mounted in a recess 102. The inner end of the switch is provided with a tubular portion 103 having slots 104. The T- shaped contact member 105 rides in the slots 104 against the action of the spring 100.

Since it is possible that the spring portion 90 of the blade 89 be squeezed inwardly and the blade slipped downwardly to interfere with the operation of the switch, I provide an annular spacer 106 having a shank 107 for frictionally engaging the recess 102 above the member 105. The thickness of the spacer 106 is such that it extends a few thousandths of an inch below the horizontal portion 91 of the contact blade 89. This prevents the contact blade '89 from moving downwardly into the switch.

The operation of this form is identical to the form shown in FIG. 2 except that the swivel action is eliminated. The parts are held together by one or more screws through the two portions of the housing. In both forms it will be noted that the various contact elements are so constructed that they can be readily stamped from sheet stock and merely pushed into position. The contact elements are thus locked into position by the co operating bends in the element and portions of the socket. Both forms can be easily and rapidly assembled with only one or two screws necessary to hold the entire assembly in place. The form shown in FIG. 2 has all these features with the addition of the ability to swivel through a 90 degree arc.

As has been previously stated these night lights are small and must be priced quite reasonably. However, it is necessary to have the proper number of contact elements and switching arrangements. Normally the assembly of these parts is costly and time consuming. The present invention provides a carefully designed and constructed miniature light in which the proper electrical connections can be rapidly and quickly assembled. Other advantages of the present invention will be readily apparent to a person skilled in the art.

I claim:

1. A night light comprising a dielectric housing having a socket portion extending therefrom, a contact portion extending from said housing at right angles to said socket portion, a pair of contact blades mounted in said contact portion, each contact blade comprising an elongated contact portion reentrantly bent at the thrust end with the free end forming a spring contact portion, the other end of each blade being bent at right angles to form an inner contact area, said contact blades being mounted on a dielectric disc, said disc being rotatably mounted ing said contact portion, one of said blades having an electrical connection to the inner wall of said socket portion, a recess behind said disc, said electrical connection comprising a conductive strip extending vertically into said recess through a bottom wall thereof, the lower end of said strip extending laterally into said socket portion, a conductive coil spring surrounding the vertical portion of said strip in said recess and resiliently contacting the inner contact portion of said one of said blades, a switch mounted in said housing opposite said contact portion, the other of said blades having an electrical connection to one side of said switch, and a contact member in said housing having an electrical connection to the other side of said switch and having a resilient portion in axial alignment with said socket portion, said contact blades, contact member, electrical connections, and switch being locked in said housing by interengaging portions of said parts and said housing.

2. A night light comprising a dielectric housing having a socket portion extending therefrom, a contact portion extending from said housing at right angles to said socket portion, a pair of contact blades mounted in said contact portion, each contact blade comprising an elongated contact portion reentrantly bent at the thrust end with the free end forming a spring contact portion, the other end of each blade being bent at right angles to form an inner contact area, said contact blades being mounted on a dielectric disc, said disc being rotatably mounted in said contact portion, one of said blades having an electrical connection to the inner wall of said socket portion, a switch mounted in said housing opposite said contact portion, the other of said blades having an electrical connection to one side of said switch, said switch connection comprising a Z-shaped strip of conductive material having a vertical portion contacting said switch, a horizontal portion contacting said housing, a second vertical portion extending beneath said other contact blade, and a coil spring surrounding said second vertical portion and resiliently contacting the inner contact portion of said other of said blades, and a contact member in said housing having an electrical connection to the other side of said switch and having a resilient portion in axial alignment with said socket portion, said contact blades, contact member, electrical connections, and switch being locked in said housing by interengaging portions of said parts and said housing.

3. A night light comprising a dielectric housing having a socket portion extending therefrom, a contact portion extending from said housing at right angles to said socket portion, a pair of contact blades mounted in said contact portion, each contact blade comprising an elongated contact portion reentrantly bent at the thrust end with the free end forming a spring contact portion, the other end of each blade being bent at right angles to form an inner contact area, said contact blades being mounted on a dielectric disc, said disc being rotatably mounted in said contact portion, one of said blades having an electrical connection to the inner wall of said socket portion, a recess behind said disc, said electrical connection comprising a conductive strip extending vertically into said recess through a bottom wall thereof, the lower end of said strip extending laterally into said socket portion, a conductive coil spring surrounding the vertical portion of said strip in said recess and resiliently contacting the inner contact portion of said one of said blades, a. switch mounted in said housing opposite said contact portion, the other of said blades having an electrical connection to one side of said switch, said switch connection comprising a Z-shaped strip of conductive material having a vertical portion contacting said switch, a horizontal portion contacting said housing, a second vertical portion extending beneath said other contact blade, and a coil spring surrounding said second vertical portion and resiliently contacting the inner contact portion of said other of said blades, and a con-tact member in said housing having an electrical connection to the other side of said switch and having a resilient portion in axial alignment with said socket portion, said contact blades, contact member, electrical connections, and switch being locked in said housing by interengaging portions of said parts and said housing.

4. A night light comprising a dielectric housing having a socket portion extending therefrom, a contact portion extending from said housing at right angles to said socket portion, a pair of contact blades mounted in said contact portion, each contact blade comprising an elongated contact portion reentrantly bent at the thrust end with the free end forming a spring contact portion, the other end of each blade being bent at right angles to form an inner contact area, said contact blades being mounted on a dielectric disc, said disc being rotatably mounted in said contact portion, one of said blades having an electrical connection to the inner wall of said socket portion, a switch mounted in said housing opposite said contact portion, the other of said blades having an electrical connection to one side of said switch, and a contact member in said housing having an electrical connection to the other side of said switch and having a resilient portion in axial alignment with said socket portion, said switch comprising a rotatable barrel member having a slotted inner end, a spring mounted in said barrel member, and a T-shaped contact member having its vertical leg in said spring and its horizontal portion insaid slotted end, said horizontal portion contacting said electrical connections to said other of said blades and to said contact member on rotation of said barrel member, said contact blades, contact member, electrical connections, and switch being lockedin said housing by interengaging portions of said parts and said housing.

5. A night light comprising a dielectric housing having a socket portion extending therefrom, a contact portion extending from said housing at right angles to said socketv portion, a pair of contact blades mounted in said contact portion, each contact blade compirsing an elongated contact portion reentran-tly bent at the thrust end with the free end forming a spring contact portion, the other end of each blade being bent at right angles to form an inner contact area, said contact blades being mounted on a dielectric disc, said disc being rotatably mounted in said contact portion, one of said blades having an electrical connection to the inner wall of said socket portion, a recess behind said disc, said electrical connection comprising a conductive strip extending vertically into said recess through a bottom wall thereof, the lower end of said strip extending laterally into said socket portion, a conductive coil spring surrounding the vertical portion of said strip in said recess and resiliently contacting the inner contact portion of said one of said blades, a switch mounted in said housing opposite said contact portion, the other of said blades having an electrical connection-to one side of said switch, and a contact member in said housing having an electrical connection to the other side of said switch and having a resilient portion inaxial alignment with said socket portion, said switch comprising a rotatable barrel member having a slotted inner end, a spring mounted in said barrel member, and a T-shaped contact member hav ing its vertical leg in said spring and its horizontal portion in said slotted end, said horizontal portion contacting said electricalconnections to said other of said blades and to said contact member on rotation of said barrel member,

said contact blades, contact member, electrical connections, and switch being locked in said housing by interengaging portions of said parts and said housing.

6. Anight light comprising a dielectric housing hav ing a socket portion extending therefrom, a contact portion extending from said housing at right angles to said socket portion, a pair of contact blades mounted in said contact portion, each contact blade comprising an elon gatedcontact portion reentrantly bent at the thrust end with the free end 'forming a spring contact portion, the other end of each blade being bent at right angles to form an inner contact area, said contact blades being mounted on a dielectric disc, said disc being rotatably-mounted in said contact portion, one of said blades having an electrical connection to the inner wall of said socket portion, a switch mounted in said housing opposite said contact portion, the other of said blades having an'electrical connection to one side of said switch, said switch connection comprising a Z-shaped strip of conductive material having a vertical portion contacting said switch, a horizontal portion contacting said housing, a second vertical portion extending beneath said other contact blade, and a coil spring surronndingsaid second vertical portion and re- 8 siliently contacting the inner contact portion of said other of said blades, anda contact memberin said housing having an electrical connection to the other side of said switch and having a resilient portion in axial alignment with said socket portion, said switch comprising a rotatable barrel member having a slotted inner end, a spring mounted in said barrel member, and a T-shaped contact member having its vertical leg in said spring and its horizontal portion in said slotted end, said horizontal portion contacting said electrical connections to said other of said blades and to said contact member on rotation of said barrel member,

7. A night light comprising a dielectric housing having a socket portion extending therefrom, a contact portion extending from said housingat right angles to said socket portion, a pair of contact blades mounted in said contact portion, each contact blade comprising an elongated contact portion reentrantly'bent at the thrust end with the free end forming a spring contact portion, the other end of each blade being bent at right angles to form an inner contact area, said contact blades being mounted on a dielectric disc, said disc being rotatably mounted in said contact portion, one of said blades having an electrical connection to the inner wall of said socket portion, a re-' cess behind said disc, said electrical connection comprising a conductive strip extending vertically into said recess through a bottom wall thereof, the lower end of said strip extending laterally into said socket portion, a conductive coil spring surrounding the vertical portion of said strip in said recess and resiliently contacting the inner contact portion of said one of said blades, a switch mounted in said housing opposite said contact portion, the other of said blades having an electrical connection to one side of said switch, said switch connection comprising afZ-shaped strip of conductive material having a vertical portion cong tacting said switch, a horizontal portion contactingsaid housing, a second verticalportion-extending beneath said other contact blade, and a coil spring surrounding said second vertical portion and resiliently contacting the inner contact portion-of said other of said blades, anda contact member in said housing having an electrical connection to the other side of said switch and having aresilient portionvinaxial alignment with said socket portion, said switch comprising a rotatable barrel member having a slottedinner end, a spring mounted in said barrel member, and a T-shaped contact member having its vertical leg in said spring and its horizontal portion in said slotted end, said horizontal portion contacting said electrical connections to said other of said blades and to said contact member on rotation of said barrel member, said contact blades, contact member, electrical connections and I switch being locked in said housing by interengaging portions of saidparts and said housing.

1 References Cited in the file of this patent UNITED STATES PATENTS 810,244 Wright Jan. 16, 1906 2,101,680 Johnson Dec. 7, 1937 2,166,790 Benander July 18, 1939 2,257,506 MacDonald Sept. 30, 1941 2,292,088 Benander Aug. 4, 1942 2,477,387 Mestitz July 26, 1949 2,707,733 Steinharter May 3, 1955

Claims

1. A NIGHT LIGHT COMPRISING A DIELECTRIC HOUSING HAVING A SOCKET PORTION EXTENDING THEREFROM, A CONTACT PORTION EXTENDING FROM SAID HOUSING AT RIGHT ANGLES TO SAID SOCKET PORTION, A PAIR OF CONTACT BLADES MOUNTED IN SAID CONTACK PORTION, EACH CONTACK BLADE COMPRISING AN ELONGATED CONTACT PORTION REENTRANTLY BENT AT THE THRUST END WITH THE FREE END FORMING A SPRING CONTACT PORTION, THE OTHER END OF EACH BLADE BEING BENT AT RIGHT ANGLES TO FORM AN INNER CONTACT AREA, SAID CONTACT BLADES BEING MOUNTED ON A DIELECTRIC DISC, SAID DISC BEING ROTATABLY MOUNTED ING SAID CONTACT PORTION, ONE OF SAID BLADES HAVING AN ELECTRICAL CONNECTION TO THE INNER WALL OF SAID SOCKET PORTION, A RECESS BEHIND SAID DISC, SAID ELECTRICAL CONNECTION COMPRISING A CONDUCTIVE STRIP EXTENDING VERTICALLY INTO SAID RECESS THROUGH A BOTTOM WALL THEREOF, THE LOWER END OF SAID STRIP EXTENDING LATERALLY INTO SAID SOCKET PORTION, A CONDUCTIVE COIL SPRING SURROUNDING THE VERTICAL PORTION OF SAID STRIP IN SAID RECESS AND RESILIENTLY CONTACTING THE INNER CONTACT PORTION OF SAID ONE OF SAID BLADES, A SWITCH MOUNTED IN SAID HOUSING OPPOSITE SAID CONTACT PORTION, THE OTHER OF SAID BLADES HAVING AN ELECTRICAL CONNECTION TO ONE SIDE OF SAID SWITCH, AND A CONTACT MEMBER IN SAID HOUSING HAVING AN ELECTRICAL CONNECTION TO THE OTHER SIDE OF SAID SWITCH AND HAVING A RESILIENT PORTION IN AXIAL ALIGNMENT WITH SAID SOCKET PORTION, SAID CONTACT BLADES, CONTACT MEMBER, ELECTRICAL CONNECTIONS, AND SWITCH BEING LOCKED IN SAID HOUSING BY INTERENGAGING PORTIONS OF SAID PARTS AND SAID HOUSING.