US2177797A - Electric plug - Google Patents

Description

Oct. 31, 1939. E. B. BARNlTZ ELECTRIC PLUG Filed July 22, 1936 .g. a d

swam kw {Lumaw Patented Oct. 31, 1939 ELECTRIC PLUG Emanuel B. Barnitz, Johnstown, 1 a; Application July 22, 1936, Serial No. 92,037 I i Us Claims. 260-51) in; electric .p-lugsxusedonap pliances, such as irons, the plug is frequentlyremoved. from the.

appliance while theswitch. is on and the circuit closed, thussetting up arcing in the plug. The

ypresent invention contemplatesthe use of a plug in which the switch: is necessarily in an oil position before the plug can be removed from the appliance.

n invention also includes a plug, capable of use with conventionalirons and other appliances, and embodying a hand engaging portion to facilitate removal of the plug-from the iron,

said hand engaging portion constituting a switch whereby the initial outward movement thereof opens the circuit, continued movement,

disengaging the plugirom the iron. I I

In the drawing:

- Fig. 1 is a perspective View of; a plug conmodified form of plug showing the switch in an open position.

Fig. 5 is a fragmentary edge elevational view of the plug illustrated in Fig. 4 showing to advantage the means'employed to hold the switch in an open position, and

Fig. 6 is a fragmentary elevational View of another modified form of plug showing the switch in an open position.

The plug of the present invention includes a body, consisting of two parts, I and 8, the latter being slidably mounted in the former. The plug proper '1, consists of two parts, each of which is suitably recessed to receive contacts 9, and the inner ends of the movable part 8. The part 8 is also composed of two elements between which an electric, cord Ill is clamped.

By slidably mounting the part 8 in the body of the plug, the electriccord' It] can be urged into illustrated to advantage in the drawing.

1, the opposite end of the springnprojecting into one of the recessesof said body in engagement with the inner endsflof the switch bodyt. The

springs linormally urge the partfB outwardly, as shown in Figs. 2 and3 of the drawing. How-9':

ever, manual pressure on the' part 8 overcomes the resistanceof the springs II and flexes them laterally into engagement with extensions 12, ex.- j

tending from the contacts 9. When in this position, the inner ends of the part 8 are in engagement with the reyersely foldedterminals [3 of extensions formed on the contacts 9.

Preferably, the strands of'the cord l8 extend through the sides of the part}! and ,areclamped into engagement with: the latter by contact caps l4. Each of the caps M is equippedwith lateral flanges i5 which slide in complemental grooves formed inthe'side walls of thepart 8 e :The caps may beeasily and'quickly removed when desired,

or found necessary. The strandsof the cord ill formed in the part 8, the partition having a longitudinal extending opening formed therein in which is adapted to slide ribs ll formed on the parts of the main body of the plug l.

The elements of the part 8 are held together by the caps M and a yieldable clamping ring 13 which is flexed over the top of said elements as If desired, however, a screw 19 may be engaged through said elements. e

To facilitate disengagement of the plug from an iron, or other appliance, thepart 8 is formed to provide finger engaging recesses 20. When it is desired to remove the plug, the fingers are engaged in said recesses in a manifest manner and pressure exerted thereon. If the switch is in a closed position, the first movement of the part 8 breaks the circuit. Continued movement disengages the plug from the appliance.

In Figs. 4 and 5 a slight modified form of the invention is illustrated. In this form, the springs II are eliminated. The contacts, indicated at 9, are provided with vertical extensions, the upper ends of which are bent over to provide resilient terminals 2i. These terminals are adapted to engage contact caps I4 of the switch part 8' of the plug so asto establish an electric connection between the cord ID. of the switch part 8 and the contacts 9. In this form of invention, the switch part 8 is normally held in an outward position by a resilient strap 22 mounted in the plug and engageable with notches 23 mounted in the side of the switch part 8.

In the form of invention shown'in Fig. 6 of the are held completely separated by a partition i6 drawing, the switch caps 14 are eliminated and in their stead contact screws I4 are employed, these being in electrical engagement with strands of the electric cord. The electric cord is carried by movable switch part 8 shown fragmentarily. One of the screws I4 is normally in engagement with the upper end of a resilient strap 22, the

latter being an extension of each of the contacts 9 of the plug. The strap 22 serves the dual purpose of a conductor for one side of the switch, between the electric cord l and the contacts 9 and in addition serves as a spring to normally hold the switch part 8' in an outward position as shown in the drawing. The other contact screw I 4 is adapted to engage an extension 24 formed on the other contact 9 only after the switch part 8 has moved inwardly into the plug part. As soon as said other contact [4 engages the extension 24, the circuit is closed between the electric cord and the contacts.

Although I have herein shown three forms of my invention, I am nevertheless aware that various changes may be made within the scope of the present invention, as covered by the claims hereinafter set forth.

What is claimed is:

1. A plug for electric appliances including a body having contacts for engagement with an electric appliance, a part of said body being equipped with a cord and movable, when the body is in an operative position on an appliance, for placing the cord in electrical engagement with said contacts.

2. A plug for electric appliances including a plug body, a part of which is movable, when the body is in an operative position on an appliance, contacts in the body proper and an electric cord in said movable part, movement of said part in one direction, placing said cord and contacts in electrical engagement.

3. A plug for electric appliances including a plug body having contacts, an electric cord carried by a part of the plug body, said part embodying finger engaging portions to facilitate removal of the plug from the appliance, and being movable, when the body is in an operative position on an appliance, to urge the cord into engagement with and out of engagement from the plug contacts.

4. A plug for electric appliances including a plug body having contacts, an electric cord carried by a part of the plug body, said cord carrying part being movable, when the body is in an operative position on an appliance, to effect electrical engagement of the cord and contacts, and means in the plug to normally hold said cord carrying part in an outward position with respect to the plug body.

5. A plug for electric appliances including a body having contacts for engagement with an electric appliance, a part of said body being equipped with a cord and movable for placing the cord in electrical engagement with said contacts, while the plug is in an operative position on an appliance, and spring elements projecting inwardly in said body and engaged with the movable part of the latter to normally urge said part out of electrical engagement with the body contacts.

6. A plug for electric appliances including a plug body having contacts for engagement with an electric appliance, a part of said body being movable, electric terminals engaged with said movable part, and springs mounted in said plug body to electrically connect said terminals and contacts when the movable part of the plug body is in one extreme position in the plug body, said springs normally urging the movable part out of electrical engagement with the body contacts.

EMANUEL B. BARNITZ.

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