US1348684A - Electric switch - Google Patents

Description

C. E. ANDERSON.

ELECTRIC SWITCH.

Mmc/111011 F1150 JUNE14. 1917.

1,348,684., Patented Aug'. 3, 1920.

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U-N1TED STATES PATENT OFFICE.-

Specification of Letters atent.

ELECTRIC sWrTcH.

`Patented Aug. 3, 1920.

Application filed .Tune 14, 1917. vSerial No. 174,743.

To all whom t may concern.'

Be it known that I, CARL Elue ANDERSON, a citizen of the United States of America, and residing at Bridgeport, in the county of Fairfield and State 'of Connecticut, have invented a certain new 'and useful lmprovement in Electric Switches,`ot which the fol lowing is a specification.

My invention relates to electric "switches and the object `of my invention is to provide a silnplevand eiiicient switch mechanism the operating parts of which may be economically manufactured from sheet metal and readily assembled without the use of rivets, pivotpins, or the like.

Referring to the vaccompanying vdrawings Figure v1 is a plan view of a switchin which my "invention is embodied in one -iorm. l Y v l Fig`.v2 is a longitudinal section` on the line 22 Fig. 1. f

Fig. 3 is a longitudinal section on the line 3-3 Fig. 1.V y Fig. 4 is an exploded perspective of various elements of the switch mechanism,

f The switch here shown isvo'l the push button type and comprises an insulating base 10 of cup shape, across the open face of `which extends the carrying yoke 11, secured inposition by screwbolts 12 and 13 (Fig. 3) passing throughextended ribsat opposite ends of the receptacle.V Adjacent the tappedholes in the yolre which receive the screw bolts 12 and 13, aredepressedteats 14 and 15, tapped attlieirinner ends to yreceive the securing screws byfwhich the usual cover plate (not sho'wn)f is .held `in position above the switch. The inclined walls leading to the threaded portion of the teats formA guide ways 'for ythe entering ends of the cover-plate-securing screws and facilitate their proper location.` n

Depressed ledges 16, 17, 18, and 19 at the four corners `of the receptacle are overlaid bythe offset upper ends of'theterminal plates 420, 21, 22 and 23, each of which carries not only a binding screw 24 but also a switch terminal 25 extending intol the switch chamber.` Closing the open face of the switch chamber is a sheetof insulating paper or ber 26,V resting upon narrow `'ledges 27 `on the opposite sidewalls of the `-base'10, and notched at 28 in register with I Y rib 29 which prevents the displacementof the cover piece. At its opposite ends the cover slieet'26, is slotted at 30 to permit the passage therethrough of the push buttons 31 and 32, while Vthe tongues 33, formed by these slots, are bent down inte the switch chamber against the inner faces of the terminal plates 20e-23 and serve to prevent the entry of stray wire beards into the switch chamber.

Each standardv F BRIDGEPORT, CONNECTICUT, A CORPORATIO 0,15' GON- which works the bridge piece 4:2 of the switch bar, the throw oi which is thus limit led.` An outwardly extending lug 13 on each standard is curved to form a trunnion on which the switch bai" is supported, while above the trunnions 13 the standards are `notched at 411 to aiford bearings for the rocker 15.

Thek switch bar in the form vhere shown, comprises a blade 4:6 integral with the bridge piece 42, and an opposed armv 4:7 to which a second blade 48 is secured by insulating bushings 419 so that the bladesi and 18 are electrically independent of each other. The construction oi" the blades may be modilied as may be desired and in certain instances,

as iior'instance in a 3-point switch, Vboth blades may be integral with the bridge piece. n order to facilitate the mounting of the switch bar upon the `trame, its legs are spaced sutliciently apart to straddle the frame and are shouldered at 50 and slotted at 51 so that it may be assembled on the -united by a bridge piece 52; Outwardly oi'lset bearing lugs 53 on the plates rest inathe notches 4&1 formed in the upper portions of" the frame standards.l At opposite ends of each plate, notches 54 are formed to receive the T-arm`s of the push plates 55 which are molded inv Lthe push buttons 31 and 32.

y switch bar.

TheseT-arms are of suiiicient width to project through the rocker barplates and rest upon the shoulders 56 ofthe lframe which form .stops limiting 'the throw bar 'in opposite directions.

The switch springl' which extends between the rocker bar and the switch bar, sui'- rounds aguidepin composed ci two independent straps 58 provided at one end with registering cross arms 59 against which one oic the Vrocker `end 'of the spring abuts and adjacent tol which are the'projecting ends 60 whichenter the slot @17in-the bridgepiece i201 the rit, the opposite Vends of the straps 58 the latter areY offset toward each other, as at v62, and serve to coni'ine the bridge piece 52 of the rocker bar i5 which, in assembled position, lies between the straps 'p58 and bearsagainst a' washer 63 forming an abutnientjfor one end of tliespring, Ii' desired, a similar washer 64% maybe provided atthe opposite end of the straps to ,hold the latter Vtogether and afford an abut- Ament forA theV corresponding end .of the' switch spring;

rIhe switch operates in readily understood mannen Upon depression of the out p ush *button 3l, the bar L5 rocks on its trunnions 5 3, and its bridge piece 52 vmoves toward the 30A its off stop position against the'legs Il of the frame to its opposite ont7 stop position againstthe'legs 40 of the frame, in which positionthe switchblades -jl6-fr8 are in engagement with the switch terminals 25. The

I return to off positionris obviously the reverse of this Vmovement and is occasioned by the, depression lor the button 32 which now It is obvious that by suitable changesin the .constructionof the switch bar-42 and rcarrangementh of the terminalplates, the switch connectionsmay be variously modi- `liedwith0ut altering the -operation or' the mechanism to whichjthe'invention relates. -Both the switch blades maybe insulated fromthe-bridge piece'which carries them.

,c Other variations will readily occur to those skilled in the art, which do not depart from what `AI claim myinvention. Iclaim:-` Y Y notched -in register at their., upper edges to form open bearings, and having therebelow alined bosses forming trunnions, in combinationwith aroclrer pivoted in said open bearings and a switch 'bar pivoted on said trunnions,` aswitch spring operatively inl. AIn an-electric switch, a frame compris-V ing apairY ofstandards spaced apart and terposed between the rocker and switch bar and having an associated guide seated at one end against the switch bar and in sliding engagement at its other end with the rocker, together with means for oscillating the rocker to shift the end oi1 the switch spring engaged thereby from one side to the other of the axis of oscillation of the switch bar.

2. In an electric switch, a frame comprising a pair of standards spaced apart and recessed in register to form notch bearings and having alined bosses forming bearing trunnions in combination with a. rocker and a switch bar respectively pivoted in said bearings, one of said pivoted members straddling the standards and the other lying hetween the same together with the switch spring operatively interposed between the rocker and switch bar, and means for oscillating` the rocker to shift one end ol the switch spring from one to the other side of the axis of oscillation of the switch bar to operate the latter.

3. In an electric switch a traine comprising a pair of standards spaced apart and re cessed in register to form notch bearings and having, alined bosses forming bearing trunnions, cach of said standards having a pair of legs, in combination with a rocker Vand a switch bar respectively pivoted on said bearings, one of said pivoted members straddling the'standards and working between the legs thereof, a switch spring operatively interposed between said rocker vand switch bar and means for oscillating saidrocker to shift one end of the switch spring from one to the other side of the axis of oscillation of the switch bar to operate the switch.

4. In an electric switch, a frame compris- `ing integral sheet metal standards spaced apart and recessed in register to form notch bearings and having alined anges curved to form bearing trunnions, substantially as described.

5. In an electric switch, a frame comprising integral sheet metal shouldered standards spaced apart, each standard having a,

Vpair of legs, said standards being recessed in register to form notch bearings, and having alined flanges forming trunnions, together with a member pivoted in said notch bearings and having its extent of oscillation limited bythe shoulders on the standards and a second member pivoted on the trunnions and working between the legs of the standards which in turn limit the extent ot its oscillation, substantially as described.

6. In an electric switch, a shouldered frame, a rocker pivoted thereon, a push button,a push plate carried thereby and hav- .ing T-arms engaging the rocker and impinging against the shoulder on the frame to limitV the extent of the oscillation of the rocker.

7. In an electric switch, a frame comprising a pair of spaced, shouldered, standards, a rocker pivoted on said frame and working between said standards, in combination with a push button havingA a push plate with cross arms engaging said rocker and extending beyond the same into position to impnge against the sholders of the standards to limit the throw of the rocker, substantially as described.

8. In an electric switch, a cup shaped in snlating body, terminal straps arranged in the corners of the switch chamber, a switch mechanism within the chamber, push buttons for operating the same in combination with a cover sheet of flexible insulation overlying the switch mechanism and resting on the sides of the insulating body, said sheet being slotted to afford freeways for the push buttons and the arms formed by said slots being curved downward into the chamber opposite the terminal straps to prevent the' entry of foreign bodies into the switch chamber.

9. In an electric switch, a pivoted element comprising opposed members havingcorrespondng offset portions and offsetting shoulders and open bearings therein extendu ing through the offsetting shoulders.

l0. In an electric switch a pivoted element comprising opposed members having corresponding offset portions and offsetting shoulders and open bearings therein extending through the offsetting shoulders, to-

gether with a switch frame having trunf nions over which said shoulders may freely pass to bring the open bearings to rest upon said trunnions.

In testimony whereof I have signed my name to this speeilication.

CARL nino ANDERSON.

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