Патент USA US2134541код для вставки
oct. 2'5, 193s. .y c. AALBORG SNAP SWITCH Filed 0G11. 2l, 1936 righ/ 2,134,541 Patented oct. 25, 193s ‘UNITED STATES» PArsN‘r 'sorrise ` l 2,134,541 i’ ‘Christiani Aalborg, Spring-field, Massi, assignor to Westinghouse Electric & Manufacturing Com pany,’East Pittsburgh, Pa., a corporation of Pennsylvania ì 1936,- fserialï No. 106,785 Application OctoberV 241, ' s claims. (c1. zooi-'sei` , tions, one clamp portion 23 adapted to receive a conductor ‘wire >25,- and the other portion 21 adapted to receive the insulation 29 surrounding My invention relates' generally to switch mech anisms and is directed more particularly to switch mechanismsin which movement of an operating the wire. A spindle 3l is mounted on the base approxi member causes a blade of the switch to be rotated ‘1 over a series of stationary switch contacts with a snap action. ` » e matelyat the center of the arc of the circle along Which the contacts are mounted. The spindle is _ ' `An object of the invention is to provide an im providedwith a reduced portion 33 which passes p-roved switch mechanism of this general type. through an opening provided in the base, and has ` »Another object of the invention is to provide an its end spun over against a washer 35 on the 10> - under side of the‘base. The latch plate 9 is pro 10'" improved switch mechanism of vthe snap-acting type which is of simple and rugged construction, which requires a minimum number of parts, "and vided with an opening for. receiving the reduced portion 33 of ’the-spindle 3l, so that the _latch plate is held in rigid position between the shoul der ,onthe' spindle‘and vthe base 5. The latch plate 9,1 has a segmental portion 31 provided with a flange 39. The ilange 39 has a plurality of which can be manufactured at a relatively low‘ cost. _ 115: The novel features that'l consider character ` istic of my invention are set forth with particular-` ity in the appended claims. The invention itself, spaced notches 4I, one for each contact. f Each however, vboth‘as to structure and operation, to notch is located at a point diametrically opposite gether Íwith additional objects and advantages its coresponding stationary contact. The latch 20 thereof, will best be understood from >the ,follow ing detailed description of a specific embodiment plate 9 has an extension 43 provided with an When read in connection with the-accompanying nal stud 45. » The terminal stud passes through opening at the end thereof for receiving a termi l drawing, in which: a terminal connector 41 similarto the connectors I1. The terminal connector 41 .is adapted to re 25 ceive a live conductor 49 ‘provided with an in ` Figure 1 is a plan view of a snap switch em-f bodying- the features` of my invention with they ‘ operating member _thereof removed; sulating sheath 5I. `Fig. 2 is a vertical sectional View of the snap 30 theline 1li-_II of Fig. 1; r ‘ , ' _ ' The terminal connector 41, terminal stud 45, and extension 43 constitute a means for conduct switch illustrated in Fig. 1 with ‘the operating` membermounted in position thereon, taken on ing current from the live conductor 49 to a switch 30 l blade, which will now be described. The switchv ' Fig. 3 is a top plan View of the operating mem- f blade ll is constructed of suitable resilient con ` ber`for the snap switch illustrated in Figs. 1 and ducting material and has a longitudinal opening 2; and ` Fig. 4 is a front elevational view of the operat - ing member illustrated in’Fig. 3. Referring no-w to the drawing, the structure of the \ snap switch embodying the features of my invention consists in general of ‘a base 5, a plural ity of stationary contacts 1, a notched latch p_late and 40 9, a >switch bladel I, an actuating spring a manually controlled‘operating member I5.v The base 5, which is constructed of >suitable in sulating material, has disposed in .openings’there a plurality of spaced contacts 1 ‘arranged in an 45 arcfof a circle.` Each contact’ is provided with a terminal connector I1, which has an 'opening pro vided therein for receiving a reduced portion i9 of the contact member 1. The contactl members and terminal connectors are each ’secured to the base by `means of the reduced portion 19 thereof` which passes through the opening provided in the base, and has its end portion spun over against a' 53 adjacent the center thereof< for receiving the spindle 3|. The forward end of theswitch blade l I is provided with a hanged head 55 adapted to*l engage the stationary contacts 1. The switch blade has a rearwardly extending portion 51 pro vided with a latch projection 59 which is adapted to be positioned in Vthe‘notches 4l of the latch 40 plate 9. A pair of spaced projections Bü extend upwardly from‘one edge of the switch blade Il adjacent the slotted opening 53, and a second pair- Á of similarly spaced projections 3i extend upward ly from the opposite edge of the switch blade ad jacent the slotted opening. The switch blade is mounted on the spindle by means of the slotted opening 53 and is held in spaced relation from --the base 5 by means of a spacer washer 63. The slot 53 permits the bladeY Il to have a limited 50 sliding' movement and to rotate for successive engagement with the spaced contacts 1. ’Spring means i3 is coiled aboutl the spindle and washer 21| ‘positioned between-the end of there the free ends 65 thereof extend'> through> the space duoed- portion and-¿the base. `Each terminal con-Vv nector; His; provided `withffapair of clampfpor-U between theprojections 59 andßi, as shown‘in 2 2,134,541 Fig. 1. The normal tension of the spring causes its projecting ends 65 to engage the rearward pro jections 6€) and 6I, so as to bias the blade in a longitudinal direction to cause the latch projec Ul tion 59 to engage in one of the notches 4I so as to lock the switch blade I I whenever it engages ' any of the stationary contacts -I. engages in the notch 4I corresponding to the lowermost contact. The blade is now securely locked in position on the lowermost Contact 'I. If it is desired to rotate the blade back to the position shown in Fig. 1 in which it engages the center stationary contact 'I, the operating mem ber is moved in a counter-clockwise direction and av reverse action takes place. The projection T'I‘of the flange 'I5 engages andr moves the lower An operating member I5 of moldedî insulating material is rotatably mountedV on the spindle 3‘I 10 and is held thereon by means of a split'ring 61 so that the spring I3 is compressed to press the‘ i free end 65 of the spring I3 and introduces an 10 additional tension therein. After the spring has switch blade I I into engagement with theY con» been. tensioned sufficiently, further movement tacts ‘I and to hold the blade against the causes the lower free end of the spring to engage spacer 63. the' forward' projection IìI and move the blade The operating member I5 is of segmental‘shape longitudinally to: Withdraw the latch projection and has a hub portion 69 formed integral there with on the under side thereof. The hub portion 59’ from the,- notch 4I in which it is engaged. is provided with a centrally di‘sposedlv opening 'FIT The blade is now rotated with a snap action by the'tension of the'spri-ng I3 into engagement with by means of which the operating member is ro tatably mounted on the spindle 3|. The centrally the center stationary contact 'I. Further rota disposed opening 'II- o'pens in-to a- chamber 13€ tion of the-switch blade I I is prevented by reason at the top of the operating member for receiving of the upper. free end (i5-ofl the spring engaging the split ring 67. The under side' of the hub B9 the upper end. of» theflange 15». The normalV ten sion of. the spring: 65.» now moves‘the switch blade has a semi-circular flange 'I5 formed integralv longitudinally so that the latch projection- en therewith. One end of. the ilange 751 has a de gages-in the notch 4Ir corresponding to the cen-A 25 pending portion 'I1 adapted» toengage the lower ter contact 'I. It will be noted that the engage free end 65 of the coil spring> I»3- whenr the'operat ment-of either end of the spring I-3 with the for ing member is rotated in a- counter-clockwise di ward. projections of the pairs 60 and 6I causes rection. The other end of the ñange'l5 is adapted sliding movement of the switch blade II so as > to engage the upper free endy 65 of the spring It!to release the projection 59 from the notch in when the operating member is- rotated' in. a clock wise direction. A knob projection 'I9 is formedv which it is engaged. The rearward projections integral` with the operating» member adjacent the of the pairs BEL and- 6I form the means by Which edge thereof by mea-nsf of which the operating the bladeïis rotated by the tension of the spring I3, and in addition form the means whereby the member may be manually rotated».Á The operat normal tension of thejspring` causes` longitudinal 35. ingy member may be constructed of any suitable movement of< the blade to latch engaging posi insulating material. ~ tion; v The operation of the structure described above It is evident without further explanation that will now be briefly explained. Let itV be» assumed if the operating member Iäiisrotated far enoughl that it is desired to move- the> switch'. blade from the position shown in Fig. 1 intoV engagement in either. direction,` the blade will be- rotated in with the next lower contact. It will be- noted- the manner described from contact toy contact that in the position of the parts- illustrated in so that the amount of movement of the operating member I5 determines the amount of movement Fig. 1 the ends-of the spring I3 engage the' rear of the switch~ blade I'I-. 45 ward projections 60 and 6 I to' hold the latch projection 59 in one of the notches 4I so that the blade II is held in locked position on the center stationary contact 1f. The operator grasps the knob, ‘IS- and rotates the operating member in 50 a clockwisey direction about thespindle 3'I‘. The upper end of the iiange ‘I5 (see Fig. 1~) engages andA moves the upper freel end 65 of the*y spring I 3» and introduces an additional tension. in' said spring. After a slight rotation of- the operating j member I5» in which suñìcient tension is intro duced in thev spring means, the end of the flangeî causes the free upper end 65 ofv they spring to< engage the forwardl projection 60. A slight addi tional- rotation of the operatingk member causes the upper free end of the springy to move the forward projection 60 to slide the blade longi tudinally in theforward direction soV as to'- with draw the latch projection 59-from its engagement in the notch 4-I. The switch blade is now free 65 to- rotate, and' the increased tension'of the spring causes the lower free end 65 to exert considerable force on the'rear projection BI, thus causing the blade to. rotate with a snap action, so as to en gage the lowermost stationary contact. 1. Fur ther movement of the blade is prevented by reason of the lower free end 65 of thel spring engaging the depending projectionY ‘I1 oi’A the flange ‘I5 upon the operating member I5. At this time, the normal tension of the spring moves the blade longitudinally so that the. latchV projection The normal` or open circuit position of the switch blade IfI» is that position in- which it en gages the terminal stud 45. vIf desired, however, an additionall blank Contact and a notch therefor in the latch plate- (not shown) may be providedy to be engaged by the switch blade in the'normal or open. circuit position thereof. The number of stationary contacts and coop. erating .notches in the latch plate may be in creasedin number tozmeet the particular require ments. Only three-have been illustrated in order to simplify the drawing. 'Iîheswitch mechanism described herein may, for example,> be- employed to control the motor ofV an. electric food mixing.` device, or may be em ployedy to control. any electrical device with which 60 it is desirable or necessary to use a multi-contact switch having a snap action. From the foregoing description, it is evident that the invention provides a novel form of snap switch in which a single spring serves to rotatably couple the switch blade with the manually con trolled operating member, and also servesto lock or unlockA the switch blade in or from engagement with any of the contacts. The spri-ng also func tions to rotate the blade with a snap action and presses the blade into engagement with the con tacts; ' ' While a particular embodiment of the inven-tion has been shown, it is obvious that various changesma'y be made in the structure Without 2,134,541` departing Í from'.` the spirit ~ "ói theA invention. ' ‘ ForV toI .lockl said» ‘bladei‘wl'ieneverï it’ engages anyY of ' example, »the shape of f the f manually f controlled"v blade in a’longitudinalâ' direction .to .cause said operating ‘member ïma'y» bev ‘changed lf'to‘ suit-par ticular requirements. `A 1 pair-‘of `depending `pro jections of different length'l’m'ay be""substitutedA for the semi-Ácircularilange 15 and the _depend said Vconta'cts,.lspr`ing means normallyurging said member to »engagelwithï said stops, and for rotat ing'said blade, means for ltensioning said spring means,- and means ‘carried byfsaid lblade engaged byïlsaid‘springl means ‘when saidl spring means is ing .projectionH 1-1.'-' Likewise; various other means suiñciently tensioned to rotate the blade with a for coupling the spring to the operating mem snap action for moving said blade longitudinally ber may be substituted for thespeciñc coupling Vto withdraw said >member from the stop with 10 10 means illustrated. For example, the free ends which it is engaged to- free said blade for` rota of the spring may pass through slots in up tion by said spring means. Y wardly extending projection provided on oppo 4. In a switch mechanism, the combination of site sides of the switch blade VI l. Various other a base provided with spaced contacts insulated , forms of spring means. may be `used in place of therefrom and with corresponding spaced stops 15 the coil spring illustrated. -For example, a flat one for each contact, a spindle, a switch blade 175 `spring strip may be held in tension between the . mounted on said spindle for limited longitudinal spindle 3| and the _rearward projections on the , movement and for rotation to successively engage switch blade. , , While a preferred form of the invention has 20 been illustrated, it is obvious that various changes and modifications, in addition to those suggested above, may be made without depart ing from the spirit of the invention as set forth in the following claims. I claim as rnyinvention: ,25 . 1. A snap switch comprising a base provided with spaced contacts insulated therefrom, a spin dle‘carried by said base, a latch plate carried by said base provided with spaced notches one for each contact, a switch blade rotatably mount ed on said spindle for cooperative engagement with said contacts, a latch piece carried by said i blade for engagement in said notches, said blade `having limited longitudinal movement, a pair 35 of spaced projections extending from each edge of said blade adjacent said spindle, a spring lmeans held in tension between saidV spindle and two opposite projections for biasing said blade and latch piece longitudinally in a direction to 40 engage said latch piece in said notches, an oper ating member rotatable» on‘said spindle provided with projections on opposite sides of said spindle for engaging and moving either end of said spring 45 said contacts, spaced projections carried. by said blade at each side of said spindle, a member car 20 ried by said blade for engaging said stops to lock said blade onA any one of said contacts, a spring means for rotating said blade, normally coop erating with said spindle and one pair of said projections for biasing said. blade in a longi 25 tudinal direction to engage said member with said stops, an operating member having means for moving either end of said spring means to tension the same and for causing >said spring means when it has been sufficiently tensioned to engage one of the other pair of projections to move said blade longitudinally to withdraw said member from the stop with which it is engaged whereby said blade is freed for rotation by said 35 >spring means. 5. In a switch mechanism, the combination of spaced contacts, a spindle, 'a latch plate provided with ,spaced notches one for each contact, aV switch blade mounted on 'said spindle for limited longitudinal movement and for'rotation to en 40 gage said contacts, a member carried by said blade for engagement in said notches to lock means to further> tension the same and for caus ing said spring means to engage and move either of the remaining projectionsto move said blade longitudinally for withdrawing said latch piece from said 'notches when said spring has been tensioned sufficiently to rotate saidblade with said blade Whenever it engages any one of said contacts, a pair oi’> projections carried by the blade, spring means held in tension between said 4.5 spindle and said projections for normally urging said blade in a longitudinal direction to cause engagement of said member with said notches, and for rotating said blade when said spring means is tensioned, a second pair of projections 50 carried by said blade adapted to'be engaged by said spring means when suñiciently tensioned to cause said blade to move longitudinally to with draw said member from the notch in which it is engaged, and operating means for tensioning said 55 engage said contacts and provided with a latch spring means. piece positionable in said notches to lock said ' 6. In a switch mechanism, the combination blade in engagement with any of said contacts, of a base provided with spaced contacts and with said blade having vlimited longitudinal >move corresponding spaced stops, one for each con a snap action. 2.7A snap Vwith spaced plurality of mounted on ` switch comprising a base provided contacts and a latch plate having a spaced notches, a switch blade said base for rotation to successively ment to permit withdrawal of said latch piece -from said notches, a spring means vfor, rotating said blade and for normally biasing said blade to cause engagement of said latch piece in said tact, a spindle, a switch blade mounted on said 60 spindle for limited longitudinal movement and for rotation to engage said contacts, a locking projection carried by said blade for engaging notches, an operating member for- further ten- Y with said stops to lock said blade on any one of sioning said spring means, said spring means 65 when sufficiently tensionedto rotate said blade said contacts, spaced projections carried by saidV blade at each side of said spindle, a spring coiled with a snap action engaginga means provided ` about said spindle and having its- ends disposedv on said blade to move the same longitudinally between the projections on each side of the spin to withdraw said latch `piece .from said notches to , dle, said spring being normally held in tension allow rotation of said blade. between said spindle and two of said projections 3. In a switch mechanism, the combination so’as to bias said blade in a >longitudinal `direc 70 of a base provided with spaced contacts and cor tio-n to engage said locking projection with said responding stops, a switch blade mounted on stops, a rotatable operating member having said >base for limited sliding movement and for means for engaging and moving either end of rotation to engage said contacts, a member car said spring tofurther tension the same and cause 75 ried by said blade for engagement with said stops 745 4 2,134,541, said' spring; Whenrit has: been'suiäîcientlyw ten, sioned, to, engage- one of. the other two. projec tions to; move saidi blade longitudinally andl With drawV said¿ locking projection from the stopv with e whiohvit' is engagedf to cause said»y spring through the engagementof` its-other end` with one of saidl blade .withi a. snapA action in the direction of ro tation of; said.’r operating member,y said means of said operating; member limiting rotation of said blade an amount correspondingV to the amount of rotationof said operating> member. first-mentioned- two; projections to rotate said` ~ CHRISTIAN AALBORG.