Патент USA US2114512код для вставки
April~19, 1938. 1 c. WESCHCKE _ 2,114,512 SWITCH Filed Apr-i1 15, 1957 1,1 16 INVENTOR. BY A TTORNEYS. 2,114,512 PM Apr. 19, 193s PATENT OFFICE ' UNITED STATES ' . 2.11am swrrcn ' ~ " out Weacheha, 8t rm. m am April 15, m1, we... 1:1,001 (Cl- 200-116) 11am. contact with this plate through a'predetermined winvention relates toantin’ movement during which thethermostatic element switchesofatypedesignedtomaintainaoon tact through a certain period of movement of a movable member in one direction, and to break 5 contactthroughapredeterminedmovementof , the movable memberintheoppositedirection. a It is the object of my invention to'provide a switchwhichisadaptableforuseintheprovision .ofacircmtmakingandbreakingmeans.operable 10- in recurrent cycles. This switch readily adapts is de?ecting in the opposite direction. The means holding the switch am out of contact with the contact plate also acts to hold the arm in contact 5 with the plate as it de?ects into extreme position, thus. creating a snap action when the thermo- ‘ static element de?ects su?iciently. The thermo static element may act either by a normal rise and fallintemperature, ormaybe actuated bym' itself for use in combination with a thermostatic a heating element connected in the circuit con element for actuation of a circuit breaking means. ' trolled by theswitch arm. When arranged in when thus arranged, my switch is operable for this latter manner, the switch arm closes the euseforanydeviceinwhich‘adrcuitbreaker‘ 15 operable in recurrent cycles is desired. For ex ample, my switch may he'used #0 operate lighting circuits which should be closed only-during a certainperio'dofthedayto openthecircuitafter ~ a predetermined interval; My switch may 20 beusedforopeningthedrcuittoanyelectrically operated device such as a refrigerator, in order to provide a defrostingperiod during which the circuittothemotoroftherefrigeratorisopened at intervals. - v same purpose‘or asimilar'pm-pose to that for wllch the present switch is . These for mer constructions, however, usually have neces wsitated the provision‘ of a constantly operated motor which opensand closes a circuit at pre— determined intervals. Thermostatic motors have beenpreviouslyformedtoaccmnpiishtherota~ tion of a rotatable member. These motors, how 35 ever, have previously been relatively complicated and have not been used for operation of a cir ciuiilt breaker through_ _ an adjmtable period of e. is de?ected beyond the means holding the switch arm in contact with the contact plate. In this point of the movement, the contact arm snaps out of contact with the plate and remains out of contact therewith during the return de?ection of 20 the thermostatic element as this element cools. Uponreachingacertainpointinthereturnde ?ection, the switch arm again snaps into en gagement with the contact plate again closing the circuit to the heating element, whereupon the 25 25 cycles have been provided for accomplishing the t circuit to the heating element throughout its de?ection in one direction until the switch arm 15 ’ Itis apm'poseofthepresentinventiontopro foregoing cycle is reputed. ‘ ' - It is a feature of my invention to provide a rotary element .used in conjunction‘ with the switch arm‘ and operated thereby during the re turn- de?ection of the thermostatic element. It is obvious that the means holding the switch arm outofcontactwiththecontactplatemayalsobe used to hold the switch ~arm in cooperable rela tionship with the rotary member during the sameperiodoftime,thusactingtorotafethe_35 rotatable member a predetermined distance dur ing each actuation of the thermostatic element. It is a further feature of my invention that thesnapactionswitchwhichlprovidemay be 7 used in conjunction with any movable operating 40 operated and which simultaneously operates a member in place of the thermostatic element and will act in asimilarmannergtomaintain contact rotatable member.which in turn actuates a re-' currently operable circuit breaker. By this throughout a certain predetermined movement 4o vide a simple ‘switch which is thermostatically means, a device for controlling a circuit may be .45'recurrently actuatedbyadevleewhichisex tremely simple and to manufacture oftheoperatingmembenandtobreakcontact at a predetermined point of the movement of the 45 operating member in each direction. ’ It is a further feature of my invention to pro andwhichcostsanextremelysmallamountto videacircuitbreakingmeansoperablebyaro-' a circuitduringapre Itisapurposeofmyinventiontoprovidea tatingmembertoclose determineddistanceofrotation,andtoopenthe 50 operate. - ' ao’de?ectable thermostatic element which operates ' aswitcharm. ,Thisswitcharrnisnormallyslid circuit during the remaining portion of:the rota- - ablyin contact with a suitable contact plate. Upon extreme de?ection of the thermostatic ele varyingtbetimeofcontactsothatthecircmt ment,however,theswitcharmismovedomof Mpiateandisheidoutof 55 contact with the tion. InthisdeviceIincorporateameansof may be broken throinhout a longeror shorter periodoftime. “ 2 2,114,612 These and other objects and novel features of my Invention will be more clearly and fully set forth in the following speci?cation and claims. In the drawing forming a part of myspeciilca tion: ‘ Figure '1 illustrates a’t'op plan view of my switch withsthe cover removed therefrom. Figure 2 illustrates the switch in a view similar to that of Figure 1, showing the parts in a dif10 insulation block [I and is provided with a turned down- end 32' adapted to engage the cam II. A supplementary spring leaf 33 provides additional spring tension without making the arm I! ex cessively’ heavy.‘ A bearing strip. 34 is provided near the end of the spring arm I! to hold a por tion of the arm 32 rigid. A spring arm ‘II and a supplementary spring arm 38 are slidably secured in a slot 81 in the . , v insulation block I I.’ These spring arms 38 and Figure 3 is' an elevation view of the switch and 36 are secured to an operating push rod SI having cover therefor, as it would appear along the line ‘ an operating button ll of insulating material ferent position.‘ 3-4 of Figure 1. . Figure 4 is a perspective view of the thermo 15 static motor showing the operation thereof. Figure 5 is a side elevation viewof' my switch with the cover removed. . _ formed thereon. Vertical notches ll are formed in‘the block ll adJacent the slot 31, and the arms 35 and 38 are bulged outwardly tosome extent to 15 spring into these notches II when the arms I! - and It are in extreme positions. The. free end of the arm II is provided with a bearing member Figure 6 is a perspective view of a slightly dif ferent form of switch embodying the snap action 20 for opening and closing a circuit. 42 which engages the bearing strip 34 on the strip 32. My switch A comprises a‘ base ll, having - _ 20 ' The cam I. normally engages the bearing mem ber 42 on the arm ll which contacts the bearing strip 34 on the arm I! to close the contact be mounted alongone side thereof ablock ll of insulating material. The shape of this block H is perhaps best shown in Figure 5 ofthe drawing. 25 A slot I2 is cut intothe block I l near one end thereof and a strip of bimetallic material it is inserted in the slot II. The bimetallic strip I3 tween the arms I! and 8!. During therotation ofthe cam 8., however, the bearing end 42 drops ‘away from a high point 43 of the cam. II. The is held in position by the bolt ll extending end 32’ of the am”, however, remains in con tact with -the high portion 0! the cam. thus act through a portion of the block il from one’ ‘end .ingtoseparate the arms 32 and ll, andto break 30 thereof, and terminating in a notch I! in the block ll. contact therebetween. The contact between the "' ' armllandthearm?remainsbrokenuntilthe A sleeve of insulating material It, such as as- ' end 32" of the arm 32 drops from the 111811 Mt lioithecamllbringingthearmsllandl! bestos or the like, envelops a portion of the bi metallic strip .IS, and a heating element i1 is woundabout the sleevelli. A spring am it into contact. By maintaining the arm ‘I! in a constant positio and by moving the arm II in having a downwardly extending end 20, is secured wardlyasshowninl?gureloroutwardlyal at II to the free end of the strip I3. This down wardly extending end 20 slides over a block 22 shown in Figure 2, the length oi’ timebetween the dropping of the arm 38 from the high point of the cam II and the dropping of the end 82' I of insulating material partially covered by a con 40 tact plate 23. An upwardly extending cam lug .24 of insulating material, projects upwardly from the block 22 adjacent the contact plate 23. The block" isseeuredto'theba'se lloftheswitchA. . Upon de?ection of. the ‘strip II, the arm I! is ' carried forwardly, the downwardly extending end‘ II slidably‘contacting the contact plate 2;. The path of movement of the end 2| is obstructed by the lug It so that continued de?ection of the strip It causes the end II of the arm II to slide along the plate 23 near the edge thereof, tmtil the end 2| - - the lug 24; During 'this move ment, the'arm ll is i'iexedout or normal position" to some extent. Upon movement past the lug 24', however, the end 2| movesby force of the resil -iency of the arm I! snapping out of contact with the plate 28, and sliding over the-surface of: the block 22. Asthe strip i3 flexes from the position illustrated in Figure 2 back to the position illus trated in Figure 1,v the lug It prevents movement ofthecndllofthearmiibackontotheo'on tact plate 23 until the strip It ?exes a predeter mined amount. " The ve'ment of the end 2. of the arm‘ ll along the ug 24, ?exes thearm‘ll so that when the end," clears the lug 2!, this end E II will snapinto contact with the'plate l8. _, Thus I isE E 5‘.3 E. E E is in bothdirectionsof movement of the'strip It a 1 contact is provided with a snap action‘. ‘Rotatably moimted pponsspindleurpmviaej l,‘ the gear'lllisrotatjed a short distance. Rob a-pinion?. The a gear 20 which 70 gears” and l‘li'ajr‘eiprevented-i'mm rotating in one direction bythe spring ratchet pawl II. The _- plnion?engagesthegear?whiehcan-iesthere _with'a cam II. Thecamll and gear 2! are mounted upon a suitable spindle 3 I . A spring arm" is securedin a slot‘lin . _ " -;~ I itselffromthegear Asmaybeseemtheexternalcircuittohe II 3 9,114,512 controlled extends through the wire l4’, the-arms. rotatable member thereupon, a bimetal strip wire 40 to the other supply wire 45. Whether able therewith by de?ection thereof into contact with said rotatable member, means guiding said II and 32, and the wire 41, returning through the » secured at one end to said base, resilient means secured to the other end of said strip and mov ‘ or not this external circuit is broken depends en the position of the arms 32 and II and the cam 3|. The movement of the arm I! ' is diagrammatically shown by small arrows in Figure 4 of the drawing. resilient means out of its normal path of move ment and ?exing said resilient means, said guid ing means permitting said resilient means to _ In Figure 6 I illustrate a simple switch embody ' snap into contact with said rotatable member 10 when released from said guiding means, said 10 .ing my system of snap action. .This switch ~is guiding mains ?exing said resilient means in the illustrated as having a longitudinally movable separating bar “extending through Journals ‘I. Movement of the bar." is limited by stops II. A ?exible arm I! is secured to the insulating 15 bar I! and is provided with a downwardly ex-. tending end 53 in slidable contact with the plate N.‘ The arm 52 slides along the plate 54 until it engages a lug 55 mounted adjacent the edge of the plate 54. The lug 55 is angularly disposed 20 with respect to the movement of the arm ‘I, and acts to de?ect the arm 52 to one side. This de ?ection of the arm 52 continues until the end II thereof clears the lug II, whereupon the arm "snaps back behind the lug 55 on to the insulat 25 ing block 56. A circuit between the arm 52 and > the plate 54 is in this way broken. Upon return movement, of the insulating arm 49, the arm 52 engages the back surface of the lug 55 and is de?ected in the opposite ‘direction to its previous de?ection until moved su?iciently to clear the lug it, whereupon this arm snaps into engagement with the contact plate 54, thus closing the cir cuit between this plate and the arm 52. It may be seen that the application of \a switch 35 of this type is virtually unlimited, and that my construction may be applied to many different types of devices. With this construction, the use 0! relay is avoided, a snap action between the contacts providing a su?lciently good electrical 40 connection to obviate the necessity thereof for most purposes. ~ In accordance with the patent statutes, I have described the principles of construction and op eration of my switch and while I have endeavored 45 to set forth the best embodiments thereof, 1 de sire to have it understood that this is only il lustrative of a means of carrying out my inven '50 tion and that ovbious changes may be made within the scope of the following claims without departing from the spirit of my invention. I claim: ' ' l. A thermostatic motor comprising a base, a rotatable member mounted thereon, a bimetal strip secured at one end to said base, means se 55 cured to the opposite end of said strip and mov able by de?ection of said strip in one direction into engagement with said-rotatable member, opposite direction, holding said resilient means into engagement with said rotatable member‘ for a predetermined distance and releasing said re silient means to snap said resilient means out 18 into the normal path 'of movement of said re silientwmeans. \ I ' 4. A thermostatic motor comprising a base, a rotatable member mounted thereupon, a bimetal strip secured at one end on said base, a dog, se 20 cured to the' otherend of said strip, means pre venting rotation of said rotatable member in one direction, de?ection of said strip moving'said dog into engagement with'said rotatable member to rotate the same. ‘ ' 5. A thermostatic motor comprising a base, a rotatable member thereupon, a means laterally de?ectable by a rise in temperature secured at one end to said base, a means .for preventing - 30 rotation of said rotatable member in one direc tion, lateral de?ection of said de?ectable means moving said de?ectable means into engagement with said rotatable member to rotate said rotat able member. 6. A thermostatic motor comprising a. base, a 35 rotatable member mounted thereupon, a laterally de?ectable member on said base deflected by a rise in temperature, a dog engageable withsaid rotatable member mounted on said de?ectable member and operable to rotate said rotatable member, a contact plate, means on said dog 'slid able over said contact plate during the time said dog is out of contact with said rotatable member, a heating element adjacent said de?ectable mem- ' her, and a circuit extending through said con tact plate, said dog, said heating element and a suitable source of current supply; to energize said element when said dog is out of engagement I with said rotatable member. . '1. A thermostatic motor comprising a base, a rotatable member mounted for rotation‘with re spect thereto, a de?ectable member de?ectable by heat secured at one end to‘said base, means on the other end of said de?ectable member en gageable with said rotatable member to rotate the same upon de?ection, contact means engageable with said engageable means during the time said and means’ engageable with said movable means . engageable means is out of engagement with said for holding said movable means in contact with rotatable means, a heating element adjacent said said rotatable member during a predetermined de?ectable means, and a circuit through said en ‘rotation of said rotatable member during de?ec tion of said strip in the opposite direction. 2. A thermostatic motor-comprising a base, a rotatable member mounted thereon, a bimetal strip securedat one end to said base,vmeans se ‘ gageable means, said contact means and said heating element closed when said. engageable means is out of contact with" said rotatable means.- ' . ' l '8. A thermostatic motor comprising a base, a cured to vthe other end of said strip and movable rotatable member thereupon, a de?ectable tem upon de?éction of said strip into contact with perature responsive member secured at one end to said base, means secured to the free end of said rotatable member, means guiding said mov said de?ectable member. engageable with said ro able ‘means to delay contact of said movable tatable member to rotate the same, insulating 70 means and rotatablemeans until the strip de 70 ?ects a predetermined distance, said means means engaged by said engageable means during holding said movable means in contact with said‘ a portion of its movement, a contact ‘plate ven rotatable means throughout a predetermined re-. gaged. by said engageable means throughout the remaining portion of the movement of said on a turn deflection of said strip. 76 ~ 3. A thermostatic'motor comprising a‘ base, a gageable means, a heating. element'adjacent said 15 4 aua'sm de?ectable member, and a‘ circuit thrcugh'said' said ?exible arm is slidably cnsagcd, said contact contact plate, said‘ engageable member, and said heating element to close the circuit to said heat ing element when said enzageable means is out . of contact with said rotatable member, ' 9. A switch comprising a movable element mov able between two extreme positions, a ‘resilient ' plate including a conductive portion and a non conductive portion and cam means in the path oisaid arm,saidoamholdingsaidarminen gagement with said contact portion ?exing said arm until said arm. isvmoved out oi engagement with said cam, whereupon said arm ?exes quickly secured to said movable element, ‘a bearing ‘onto said non-conductive portion. 11. A switch comprising a 'reciprocable mem ber, a conductive ?exible arm secured. to said re plate slldabl'y enmeable with said resilient arm 10 including a contact plate and an insulating'por tion, a'cam lug engageable with said arm to ?ex clprocable member to move therewith into two said resil‘i?nt arm, said lug holding said arm in extreme positions, a plate slidably engageable mined movement of said movable element in one portionjon said plate, andvcam means between contact th said contact plate for a predeter direction, and out of contact with said ‘contact plate for a predetermined movement of said mov able element in the other direction. - ‘ 10. A switch comprising a reciprocable member movable between two extreme positions, a ?exible an arm conductive of electricity secured to said ,re ciprocable member. a contact plate ‘upon which with said arm, a conductive and non-conductive said . conductive and non-conductive portions, 15 said cam de?ecting said am in one direction as said reciprocable member moves in one direc tion and ?exes said arm in the opposite direction upon the return movement of said reciprocabie member. 20 CARL WESCHCKE.