US2076136A

US2076136A - Electric plug

Info

Publication number: US2076136A
Application number: US57448A
Authority: US
Inventors: Edward E Weed
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-01-03
Filing date: 1936-01-03
Publication date: 1937-04-06
Anticipated expiration: 1954-04-06

Description

April 6, 1937. E WEED 2,076,136

ELEGTRI C PLUG Filed Jan. 5, 1936 Invenlor zg/wm E Med 6 A llomeys Patented Apr. 6, 1937 UNlTED STATES PATENT GFFHIE 3 Claims.

This invention appertains to new and useful improvements in electric plugs, the same being an improvement on my co-pending application 6. N. 720,325 filed April 12, 193 i.

The principal object of the present invention is to provide an automatic cut-out plug which in operation will be substantially automatic in all respects.

Another important object of the invention is 10 to provide 21. out ut plug of the character stated which will eliminate all manual tension.

Other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawing:

Figure 1 represents a longitudinal sectional view through the plug.

Figure 2 represents an end elevational view of the plunger.

I Referring the drawing wherein like numerals designate like parts, it can be seen that numeral 5 represents a dielectric casing provided with the end wall "I and the plug 8 engaged into and secured to the opposite end oi the shell.

95 The end wall 1 is provided with an opening 9 therein through which the plunger stem It is slidable. This stem I is slidable through the electro-magnetic coil H and is provided with a bore I2 extending inwardly of its inner end for receiving a substantial portion of the coiled compressible spring E3. The other end of the spring I3 engages into a recess in one side of the dielectric partition 14 which crosses the inside of the shell and supports the two bind-- ing posts l5--l6. A jumper between the post l5 and the coil H is denoted by numeral ll,

While a jumper l8 extending through the wall of the shell 5 extends from the binding post or screw H to the prongs on. the end wall I.

The prong H is connected as at 22 to the other side of the coil ll.

A slot is provided in the bridge plate 23 through which the stem i0 is slidable. A spring yoke 24 in this slot engages the stem Ill and frictionally holds the bridge plate 23 to the stem ID. The opposite end of the stem l0 protrudes beyond the end wall I of the shell 5, so that when the prongs 20-2l are engaged with a wall socket or the like, the stem I0 is pushed inwardly and forces the bridge piece 23 to bridge the contacts Iii-l6. In the event of a short circuit, the coil H becomes energized sufiiciently to attract the bridge piece 23 which slides on the stem I0. When the plug is removed from the 55 electrical receptacle, the stem I0 is again projectecl outwardly from the spring it so that the bridge member 2? returns to its proper position on the stem Lil.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that changes in the shape, size and materials may be resorted to without departing from the spirit or scope of the invention as claimed hereinafter.

Having thus described claimed as new is:

1. In an electric plug. an electro-magnet, a pair of contacts spacedly opposed to one end oi the magnet, an armature adapted to bridge the contacts and being magnetically responsive to the magnet, a stem extending from the armature and longitudinally of the magnet to project beyond the opposite end thereof and adapted to hold the armature bridging the contacts in re sponse to the application of longitudinally directed external force, and frictional clutch means constructed and arranged between the armature and the stem whereby the armature can slide on the stem in response to the magnetic force of the electro-magnet to unbridge the said contacts.

2. In an electric plug, an electro-magnet, a pair of contacts spacedly opposed to one end of the magnet, an armature adapted to bridge the contacts and being magnetically responsive to the magnet, a stern extending from the armature and longitudinally of the magnet to pro ject beyond the opposite end thereof and. adapted to hold the armature bridging the contaste in response to the application of longitudinally directed external force, and frictional clutch means constructed and arranged between the armature and the stem whereby the armature can slide on the stem in response to the magnetic force of the electro-magnet to unbridge the said contacts, and spring means engaged with the stem normally tending to urge the stem outwardly with the armature removed from the contacts.

3. In an electric plug, an electrmmagnet, a pair of contacts spacedly opposed to one end of the magnet, an armature adapted to bridge the contacts and being magnetically responsive to the magnet, a stem extending from the armature and longitudinally oi the magnet to project beyond the opposite ,end thereof and adapted to hold the armature bridging the contacts in response to the application of longitudinally directed external force, and frictional clutch means constructed and arranged between the invention, what is ture provided with an opening through which the stem is slidably disposed, said spring member being adapted to tensionally engage the portion of the stem extending through the opening of the armature.

EDV/ARD E. WEED.