US1672729A - Magnetic cut-out plug - Google Patents

Description

June 5, 1928. 1,672,729

C. PAPE MAGNETIC CUT-OUT PLUG Filed Nov. 5, 1925 Figi 52.5. 3/ 24 25 5 4 /6 (5 z5 /525 27 30 11 28 Inventor: Carl Pape,

HLAttomeg.

Patented Jane 5, 192s. ,i

CARL PAPE, F BERLIN, GERMANY, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A

CORPORATION OF NEW YORK.

MAGNETIC CUT-OUT PLUG.

` 4Applimnm med November 5,

The present invention relates to automatic safety devices for protecting electric circuits and apparatus from injury upon the occurrence of excess lflow of current. 6 -The general practice, especially in dwelling houses, is to em loymfuse plugs' for the. ectric equipment thereof,

protection of'tl e but fuse plugs areobjectionable in that they are destroyed upon a single operation or l0 blowing thereof and require to be replaced by fresh ones.

, The object of my invention is the provi-A s1on of an improved cut-out plug, which shall be capable of an unlimited number of operations and which shall operate delinitely to open the circuit in which it is in-` stalled at the prescribed overload and without scattering of molten metal.'

One embodiment of the invention is shown in theaccompanying drawing in which Fig.

1 is a vertical axial section of the plug with 7 the parts in the on or closed circuit relation; Fig. 2 is a transverse section taken' on line 2 2 of Fig. 1; Fig. 3 is a section similar to that of Fig. l, but with the parts in the Cif or open' circuit relation; Fig. 4 is a transverse section taken on line 4-4 of Fig. 3, and Fig. 5 is a transverse section taken von line l5 5 of Fig. 3.

The base or body part of the (plug com,- prises yupper andv lower cup-shape members 1 and 2 of moulded insulation held together by longitudinal screws 3. The lower member 2 hasl a bottom projection 4 onwhich are mounted the usual center and screw shell contacts 5 and 6 similar to the usual fuse plug contacts.

Within the cavity of the lower base member 2 and arranged concentrically thereof are a guide bush 7, a coil 8 of magnetic wire, and a magnet armature 9 freely movable longitudinally through the center of the coil 8. Secured within the lower base member 2 above the coil 8 is an insulating disk 10'centrallyapertured to provide a guide passage for the armature therethrough and having mounted on its upper surface two stationary switch contacts 11 and 12. One switch coniact is connected in well known manner, as

5o by a lead wire tothe screw shell contact 6, while, the other switch contact is connected 'to one end of the coil of magnet wire and therethrough to the center contact 5.

The armature 9 carries above the disk 10 56 an insulating head 13 in which is .embeddedl v sided lug 16 at the end. The .armature-'isf `20 yfixed therein which engages the sides of' 28 in the inner wall of the up 1925, Serial No. 67,138, and in Germany ,December 17, 1924.

the movable pole piece 14 of the switch and above the head. 13 is a hub 15 with the sides cut away near the-end to form a parallel-` rotatably biased in a clockwise direction by a clock spring 17 disposed in a central cavity 18 formed in the lower side ofthe insulating disk 10, whereby the pole piece 14 normally tends to move away from the contacts 11 and 12 and into the position indicated in Fig. 4 against the stops 19 projecting inwardly4 from the sides of the upper base member 1.

The armature is held latched in the on or closed position -of the switch by a cross-bar notches 21 extending upwardly from the top of the cavity 18 into the disk A10, and the `ine'ans for preing the armature 9 longitudinally upward is a helical spring 22 located between its lower end and the guide'block This 4spring is made suiliciently stiff to resist movement of the armature downward under the action 'of the magnet thereon,

while normal current is flowing, but yields upon the occurrence of excess current flow and thereby permits the cross-bar 20vto escape from its retaining notches 21, wherelupon the biasing spring 17 causes it to rotate upon its vaxis to carry the switch pole into off-position.

In order to reset the switch in the on or closed position, the up er body part 2 has swiveled therein a thum piece 23 comprising.. a-langed inner part 24 and an outer thimbleshapedl part 25 rigidly attached to the inner part, wlth a sprln 26 interposed therebe-4 tween and adapt to frictionally restrain the rotary movement thereof. 'The flange 27 of the inner part is seated in a circular recess er body part 2, one-half of which is made4 eeper than the' other, as indicated in Fi ..3 and 5, and the flange 27 is provided wit a thickened uadrant 29 adapted to play freely in the eepened portion of the recess 28, but limlted 100 to a quarter turn therein. The inner art 24 of the thumb-piece has a cylindrica recess- 30 adapted to receive the upper end of the hub 15, and extending upwardly as an extension to the cylindrical recess 30 is a 106 Y switch-so long as theexcess -ow of current v coll 1n said base,

engagmg -the notches thereo 16 pulled clear of the coupling mortise 3l in the thumbpiece 23 so' that turningof'the thumb piece may notoperate to reclose the continues through the magnet coil 8.

, While I have shown and described the best embodiment ofthe invention known to me, I donot desire to be restrictedthereto.

What IV claim as new and desire to secure by Letters Patent of theA United States, is

1. A magnetic switch plug comprising a base provided with side and end terminals, a magnet coil concentrically arranged in said base, a notched insulating disk enclosing said coil insaid base, switch contacts on said disk, Aa rotatably biased" armature extending throughsaid disk and having provisionsffor a movable switch member carried by said armature, and a thumb piece extending through said base and provided with means for engaging said movable switch member. v

2. .A magnetic switch plug comprising a.

base provided with side and end terminals, ,a

mao'net coil .concentricallyarranged in said C base,

a notched insulating disk enclosing 'said a'rotatably and-axially biased armature' eX- tending through said disk and having provisions for engaging the notches thereof in `unretracted position, a movable switch mem- 30 switch contacts on said disk,

ber fixed to sa'd armature, and a thumb piece mounted for rotary movement in a fixed plane and provided with means for operatively engaging said movable switch member only when in unretracted position.

In witness whereof, I have -hereunto set my hand this 12th day of October, 1925.

CARL PAPE.

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