US1915951A - Switch operating mechanism - Google Patents

Description

June 27, 1933. H, P, PlNKHAM 1,915,951

SWITCH OPERAT ING MECHANISM Filed Sept. 4, 1951 l lim@ 4 y Patented Juner 27, 1933 UNiTED STATES PATENT OFFICE HENRY P. PINKHAM, or wor-LAsTor-i, MASSACHUSETTS, Assiefnon To ooNiiITVELiio- TRICAL MANUFACTURING: CORPORATION, OF HYDE PAR-K, MASSACHUErlflyls, A.LCOR

PORAIION OF MASSACHUSETTS SWITCH OPE-RATING MECHANISM Application filed September 4, w31. Serial No. 561,164.

rlhis invention i'elatesto mechanism for effecting the closing, either manually or elecsoinclined that the reaction of the switches 'tends constantly 'to move the toggle free from the latch and permit its collapse in a switch opening direction7 and a second latch which'is responsive to the tripping means for the switch for holding the toggle holding latch against release of the toggle.

It is desirable to usethe same mechanism for the control of a. variable number of switches and also to control the operation of switches which, due to brushes of diiiierent current carrying capacity, exert widely different forces on the mechanism in a switch opening direction. In either' case the mechanism, and particularly the tripping mechanism, must be designed to operate satisfactorily under conditions which exert a wide.

range of pressure on the latching mechanism. It is a further ob'iect of the invention to provide mechanism including a toggle holding latch which is constantly biased by th-e a second latch which is governed by the Q switch tripping means for releasably hold-` switch reaction for release of the toggle, and

ing said toggle holding latch, and adjustable means which acts'on said secondlatch with a variable force in opposition to the switch opening pressure exerted on the latch diie' to the reaction of the switches. As thus arranged a very low energy tripping solenoid is adequate to trip the mechanism.

. A further objecty of the invention is the provision with a latch on. a latch construction for releasably holding' the mechanism: locked, of a trip-free switch mechanism wherein one latch is carried by and is movable with the mechanism and the otherlatch is carried by a. liiXed support,.,and parallel linkage vmeans operatively 4connecting Asaid latches togetherwhereby to maintain a con stant relation between say-id latches during switch closing movement of the mechanism.

A yet further` object `of `the invention is the provision of a toggle holding latch which is movable with the switch mechanism anda stationarily supported latch which holds the movable latch lin toggle holding condition in alllparts ofthe travelof the mechanism from switch open to switch closed position yand .is so arranged that it vcan release the: movable latch in any position in which it maybe located because of the position of the switch mechanism, wherebyy to trip open the switch anywherebetween open and closed positions.

Another object of the invention is the provision of switch loperating mechanism. including-a, trip-free toggle, a; latch which ynormally holds-the toggle against breaking,4 and al latch-controlling member forholdilng'the latch in engagement withthe,toggle,tlie.latch1 moving with the toggle between switchopen and closed positions while the-latch-controlling member remains inone position, where it is held by asecond latch.v

Astill further object ofthe invention is:V

generally to improve the. construction and `performance `of switch operating` mechanisms.` 1

Fig. l is a side elevation of the switchoperating mechanism embodyingtlie invention;A

the parts being shownin-Ethe `switch closed position.

.lid

Fig. 2 is a detail side elevationishowing the linkage of the mechanism in thel switch tripped positionk of the mechanism. y f y Fig. 8 is a view similar to FigQ with the parts in reset position ready for switch closing movement.

The switch operating mechanism hereini;

illustrated is adaptedto provide for themanual opening and closing of one or more electric switches connected thereto, andalso for vthe opening and closing of the switches by electrically controlled means.V The switch@ just prior to the resetting-ju mechanisms.

cuit interrupter .n present .embodiment voit the invention.

at their respectively `center position of the 12 and alower and parallel actuating shaft 14. vThe 'operating shaft 12 in some instances may constitute the operating shaft of` a cirbut it is not so shown in the mechanism includes aV generally horizontal rearwardly extended operating crank arm 16 which is fixed to the operating shaft'12 and a substantially parallel rearwardly ei;- tended actuating arm 18 which is pivotally` supported controlled by means of a switch rod 19, and said crankv arm is constantly biased for movement in a counterclockwise direction by the operating mechanism of said switches.

Said operating and actuating arms 16 and 18 are adapted normally tobe releasably connected together for conjoint operation. To this end the, similar ree ends otsaid arms are connected by an inverted trip tree toggle comprisingthe upper ybent link 20 and the lower link, or block, 22 which have a common pivotal connection on the pin 24. Said toggle links 2O and 22 are pivotally connected `free ends'by pivot pins 26 and 28 to the tree ends of said operating and actuatingv` arms. r)The upper togglelink 20 is formed with a lower forwardly-directed refleXed end portion 80, whereby in the on-` toggle links the comirnon pivotal point 24 can lie below and in direct line with the pivot points 26 and 28.

` L the present instance, to maintain the togglel Means A'are lprovided normally in an undersetposition in which the pivot point 24'is disposed slightly to the rear of the line including the pivot points 26 and 28, in which position of the links the toggle Said means includes an abutment screw 82 which isscrew-threaded into toggle link 20 the lower portion 30 of the 84 of the lower 'and engages an abutment tace i toggle link 22I by which the angular diver-A V 'gence' ot toggle links 22 and 2O can be adjusted in an obvious manner.

The toggle is held releasably in its'normal one 'being behind the other inthe drawing, which are pivotally 6o supported on the pivot pin 28at the vend of the actuating arm, one on each side thereof. Said latches 36 extend rearwardly on opposite sidesr of the toggle link 20 and are provided vwith inclined latch faces 88 which engage a pair olatch rolls 40 Awhich are carried one "on each side "of link `2O by a studv 42- which TheV ling the latches 86 `whereby at its forward end on the actuati 'ing shaft 14. The'operating ycrank arin 16 `is operatively connected to the switches to be extendstransversely through and is ixed in y the toggle link 20. Due to the inclination of the latch lace 38, however, the engagement 'of the latches 36 with rolls 40 is not self- 'locking and consequently the switch opening bias of the switches connected with the mechanisni exists a delinite latch-releasing pressure on the latches. The rolls 40 when -released from the latches can travel over the arcuate or cani taces 44 ofthe latch tails 46 into a switch open and collapsed position of the toggle.

ifi tripping to control the release el' the latches. Said tripping latch comprises a'pivoted bell crank including the gei'ierally horizontal arm O'havinga latch roll 52 at its free end thatengagcs the vertical latch face 54 ofthe depending arm60 of a latch crank which is pi'votally supported i on the actuating shaft 14. `Said latch ycrank also-has a rearwardly extended shorter' arm 62 in the free end of whichis hooked a tensile springL 64. Said spring 64has its bottom end hooked'into a stud 66 which is vertically ad` justahly screw-threaded into a' horizontal portion of the iframe 10 whereby constantly to the latch crank for clockwise rotation.

The toggle holding latches 86L are each Vprovided with a similar dependingy arm 68 which arms are parallel with and arese arately connected with the arm oft e latch crank intermediate its ends by two similar horizontally offset links 70. Said links ZO 'are pivotally connected with said arms 68 and 60 at'fpivot points 69 and 71 which are equidistant from the pivot points 28 and 14 so that the links 70 occupy constantly a parallel relation with the actuating arm 18 regardless oi the position of said arm,

with respect to said arm, where said crank arin 60 is held latclied. The arrangement C and` thus hold the latches in a delinite position latch 48. is provided for holdis such that, with the toggle holding latches in engaging position with the rolls 40, in

mediate, positions foithel mechanism, 'the latch crank due to its parallel connection with latches,` will be in position to have the latch face 54 thereof engaged by the roll 52 of the either switch open or switch closed, or interat its other end with an inverted U-shaped bracket' 7 6 of a panel supporting framel78. Said Jframe 78 is `supported by a box, or

magnet trame, 80 which in turn iscarried by the frame 10 of the mechanism.

ln some cases where the reaction of the contact members and the weight of the mechanisin of the connected switches is insullicient to secure rapid voicienin'g of the mechanism, accelerating springs 82 are providedwhich` are'connected4 at their upper ends `to the mechanism frame 10 and at their vlower ends to the extended ends of the stud 42 which is fixed in the toggle link 20.

, It will be evident from the above descrip- Ation of the latching means that the latches 36 are constantly biased for release of the trip free toggles 20, 22, but that such release is prevented by the engagement of the stationarily supported tripping latch 48 with the latch arm 60. .j

The latch construction above described is arranged so that the toggle holding latches 36 andthe stationarily supported tripping latch 48 maintain a constant relation with each other and with the trip free toggle dur` ing the travel of the switch mechanism from switch open to switch closed position. Thusl lwhen the mechanism is moved from the switch open, mechanism reset position of Fig. 1, the actuating arm 18 and the parallel links 70 move in a clockwise direction about their pivotal supports 14 and 71. The latch crank, and consequently7 the pivot point 71, remain xed during this movement and, dueV tothe parallel linkage including the dependingV arms 68 or latches 36 which are pivotally supported concentrically with one end of the toggle, these latches maintain a constant relation with the toggle during 'this movement and hold it locked. i

The tripping latch 48 is pivotally 'supv ported on a pin 84 of the magnet frame 80 and has a forwardly extended'arm 88, the free end of which is engaged by a generally horizontal tripping frame 90. Said tripping frame 90, in plan view, is generally Y-shape and has its trunk portion pivoted on the pin 84 withfthe branch portions thereof forwardly extended and overlying each a tripping pin 94 of the two foremost tripping solenoids 96, one of which is shown in Fig. 1. A third tripping coil 98 is provided between and at the rear of coils 96 which has a tripping pin 100that acts upwardly on a horizontal arm 102 that is pivoted at its forward end and,

upon being raised by the pin 100, engages aV switch can be tripped open at any position of the mechanism between switch open and closed positions.

Electrically actuated closing means 4isfpro- "vided including the closing solenoid 116 having a plunger 124'whichgis operatively' con-" nected Iwith the actuating arm 18, intermediate the ends thereof, by means of a link 128 anda pair of screw-threaded eyebolts 126.`

Means including a compression spring130 constantly urgesthe plunger and the actuatmg arm 18 into the elevated switch open p0- sition of Fig. 3 in which the trip free toggle latches andthe tripping. latchare reset and the actuating and operating arms are locked closing move` together for conjoint switch ment. t

Means are also provided for holding Vthe actuating arm 18 andconsequently the oper- Iating mechanismireleasablyin a switch `closed Said means includes an underset position. I toggle comprisingthe upper 'link 134 and the lower 'link 136 which have a common pivotal connection on the pin 138.v The'free end of the uppervtoggle link 134 is pivoted on* the operating shaft 12 and the lower 'toggle link? 136 is pivotally connected at its free end to the actuating arm concentrically otal connection of the link 128. togglelink is provided with an extension 140 with the pivwhich engages with a pin 142' located mid-fy way between the pivot points of the lower toggle link insa slightly underset position of the toggle and consequently prevents the toggle from moving into a set and locked position. The upper toggle link 134 carries a" latch roll 144 on the pin 138 that `is engaged by a holding latch 146 which is pivoted on the actuating shaft 14. A spring 1481's con- The upper nected with said latch intermediate its ends and with an ear 150 of the actuating arm and-Y consequently biases the latch in a clockwise direction into engagement with the latch roll s Y Means are provided to release the holding latch 146 only when the trip free components of the mechanism have been tripped and have reached very nearly the switch open. position thereof. The latch is consequently provided Vwith a rearwardly extended ear 152 which Y `carries a horizontally extended stud 154i Said stud is slidably received in` the lowerl `les looped end 156 of a spring'158 which conn stitutes a tripping link between the latch 146 and the `operating crank arm 16.l `The ycrank arm 16 is yprovided with a depending ear 160|- into which theupper lend of the. spring is hooked. The lower extremity of the loop is adapted to engage the stud154 just before the'crank arm 16 reaches its fully switch open position thus to release the holding latch 146- and permit the toggle associated therewith to collapse, and allow the closing components of the mechanism under the action of spring toV move "tothe switch open and mechanism resettingposition thereof. A Provision isf also. made `for closing the switch manually. vF or this purpose 'the upper toggle link 134 of the holding toggle is provided with an angularly related forwardly extended boss `162 which is provided withv latch '146 holds it rel'easa'bly in closed posi- :tion as before.

The operation ofthe mechanism is as followszY Y.

l/iththeniechanism in the switch closed position 'thereof shown in lig.v 1thegtrip free components of the mechanisinare'biased for switch opening movement by the reaction of.A the connected switchesA durino'. which movement the operating crank arm 16 rotates in a counter-clockwise direction. S'a'idcom-y Elfao ponents are held/against switch opening.y

movement,l however, by the toggle holding latches36 which hold the trip 'free toggle I r22, 'releasably iniits undersetpositionand by the stationarily supportedtirippinglatch 48 which in turn holds the toggle `holding latch. The operating arm 16 andactuating arm 18 are thus 4operatively connected and are both held against switch opening. move# ment by the latched holding toggle 134,136

ping against the action of spring 130 which acts upwardly y l/Vhen one or another ofthe solenoids96,

' 98 is energized, as

.trame 90vis rotated in a clockwise' di-v thousand `watts .that with the latch construcon the actuating arm 18.

by an overload, the trip- -rection as previously described, thusin turn the cam faces 44 of' the latches, the spring- 64' holding the cam faces yagainst' the latch rolls to rotate' the tripping a position below and out of engagement with the right and p inclined latch faces 38 of ythe toggle .holding latch 48 clockwise into the latch face 54. Upon the releaseof the vlatch crank, under'the action lof the switch l 1 diameter of latch roll 40 the remaining thrust opening bias, the toggle 20, 22 will break to the rolls 40 will travel over the latches and thenwill ride upwardlyialong 40 as illustrated in Fig. .2. In this figure .the trip free ycomponents of .the mechanism c have nearly reachedtheir fully switch open position in which the holding latch'146xis released. The tail piecesy 46V of' latches36' arev of suchflen'gth that the rolls 44 always gre'-,l main behind and in engagement with the cam x faces 44 thereof. Upon the; release ofthe holding toggle.134, 136=the actuating arm 18 and its connected. solenoid move upwardly During the lresetting' shown in F i gs. 1 and 3. 1 During the resetting movement ofthe tripping toggle the latchesV 36 and the connected tripping mechanism. are

.biased for rotation in a clockwise direction under the action of spring 64. Consequently,

v. the caniiacesf44 are held in engagement .with

therolls 40 duringsuchresetting movement of the mechanismand-due to the ,parallel said 'holding latch against release of said aonnection, and.. trippingl means for .actuating said tripping latch. vy flinkageicomprising the generally horizontal arms ,18.and-r 0 andthe vertical arms 68 .and

1. 60 the 1,latch,crank isy causedto rotatein a counterclockwisc direction into its normal position ingwhichthe latch fface 54` thereofa'lo isagainengagedby. the latch 4roll 52. .In this positionlofthemechanism, which is illustratredin-Fig. 3, the operating andactuating arms 1,6' and 18 are againlocked togetherready V,for subsequent :conjointswitchclosing move-0 ment; The holding toggle 134, `136 is c oltlapsedifln the'unlatchedj position ofA the holding latcli146=as shownin Fig. 3 the stud y i l154 `thereofislocated `at the bottom extremity ot tholoop `156 of spring 158- and istherebyafo prevented vt'romiindue rotation in aclockwise direction.,.in the early switch closing movement ofithemechanism and beforethe latchl i reduced wd be' much smaller than-would .be necessary if the .whole force diie to gthe reaction ofV thaV yconnected switches; were exerted .againstthe i, trippingvlatch, It is found in `practice that where formerlyl the power consumption. ofi ma solenoid for tripping the single latch mecha.-r nisnrassociated l.with acertain switch was one tion :of the present inventionthe vpowerfl consumption of 'the solenoidsfcan be reduced toiil thirty-tive wattsf, I Y vf. -1 i By `adjusting the pull of spring 64 and .the i Yvariation inthe reactionofdiierent switches on the mechanismiwhile maintaining a. suit-k ably lightpressure against the trippinglatch L face.l

1 Various changes may be made in-.thevednnaifm struction and Varrangeinent of theparts with 'out departingirorn the scope olf-,the inven tion.

iciaimz;

L 1. Switch operating :mechanism i includiljxgitl,`

an'operating member which is biase'dnfor switch opening movement, anvactu'ating meme ber, a ecollapsible connection betweenqsdd'i.

members releasably-gconnectiiig them for coxi-V .ioint switch closing movement,a latch carrem .byQsaidactuating member for holding said connection against collapse, i a Stationarily supported tripping'I latch Y arranged `to hold Switch operating inechaiiism-includin a pivoted operating; member which y is biase i c for; switch i vopening movement, ai pivoted `actuating ,member 4also `biased for swjelilw opening movement, a normally under-set toggle connecting the free ends of said mem-` bers, a toggle holding latch movable with 3. Switch operating mechanism including apivoted operating member which isbiased for switch opening movement, afpivoted actuating member also biased for switch opening movement, a normally under-set toggle re-` leasably connecting the free ends of said operating and actuating members, aitoggl'e holding latch carried by and movable with said actuating member, a stationary latch which holds the movable latch in toggle' holding condition whereby to lock said operating and Aactuating members releasably together in all parts of the travel ofthe mechanism, and means for tripping said stationary latch to effect the tripping of the movable latch.

4. Switch operating mechanism including a pivoted operating member which is` biased for switch openingl movement, a pivoted actuating member also biased for switch opening movement, a normally under-set toggle releasably connecting the Jfree endsr of said operating and actuating members, a toggle holding latch carried by and movable with said actuating member, a stationary latch which holds'the movable latch in toggle holding condition whereby to lock said operating and actuating members releasably together in all parts of the travel of the mechanism, means to hold said actuatingmember releasably in switch closed position, means to trip said stationary latch toeiiect the tripping of'said movable latch and the switch opening movement of said operating member free from said actuatinginem'ber, and means responsive to the switch opening movement of said operating member to release said actuating member and reset said movable and stationary latches.

-5. Switch operating mechanism including pivoted switch voperating and actuating members having means for biasing them separately in a switch opening direction, meanscoiinecting said members rele'a'sably together for conjoint switch closing movement including a normally under-set toggle which connects the free ends otlsaid members, and latching means including a movable latch carried by said actuating `member .having a holding connection with said toggie, and a stationary latch for lholding'the movable latch in toggle holding condition,

the connection between 'said stationary and,v movable latches being such that said latches remain in the aforesaid holding relationl in all parts of the' switch closingmovement of saidmechanism, and means for ytrippingv said stationary latch to eifect the vrelease of;

y said toggle. i

6. Switch operating mechanismI including pivoted switch operating and actuatingmembers having'vineans for `biasing them separatelyt, in fa switch opening, direction, means connecting said membersreleasably together :tor-conjointfswitch closing movement including normally, under-set `toggle which connects `the freeends of said members, and

latching means includinga movable latch carriedby` said actuating member havingI a.`

holding connection with said toggle, `and a stationary latch for holding the movable' latch intoggle holding condition, theycon- `nection betweensaid stationary and movable latchcsfbeing suchV that said` latches remain in the aforesaid holding relation in allpart's. of theswitch closing Vmovement of said ymechanism, alsecond toggle releasably holding said actuating member in switch closed ,position againstits bias, a latch controlling the collapse oi'said toggle, means totrip ,said` mechanism including means acting` on` saidv stationary latch te trip it and effect the tripping ot saidv movable latch, whereby to per- 4mit opening movement of saidV operating member Jfree from lsaidactuating member, and means which acts only in the latter part of the switch :opening ymovement of vsaid operating member to release the latch on said second toggle, `wherebyto permit` said-actuating meinberto move to switch open andF mechanism resetting position. h Y y `v 7 Switch operating mechanism including pivoted switch operating andswitch actuating arms, a normally under-set inverted ,toggle `releasably connecting the free endsof said arms, a pivoted/latch carriedv'bysaid actuating arm'fonholding said toggle releasably in the,l aforesaid position,1 a stationary latch for holding said movablelatch in ico toggle holding condition, said stationary and v movable.y latches having a parallel motion connection whereby they maintain holding `relation with said toggle in all parts of the switch closing travel of said mechanism,'and

means to tripV said stationary latch to effect the tripping of the movable 'latch and' the release of said operating-arm. i

8. Switch operating mechanism` including pivotedswitch operatinggandl switch actu-l ating arms, ineans operatively connectingl said arms including a` normally undersetinlverted toggle, meansbiasingsaid mechanism for switch opening. movement, means for holding. said toggle .releasab'ly iii the aforesaid underset position including movable and stationaryv vholding latches,v said movable latch ibeingcarried bysaid actuatingjarm landihaving a liolding'engagenient Lwith said toggle `,andi saidl stationary latch vbeing carried by fixed support and having: an operative holding connection with said'niovable latch, andjmeans for trippingsaidstationary latch"V and consequently for tripping i said movable latch toelfect the collapse ofsaid toggle.

9. Switch operating mechanism including a generally horizontal pivoted switchoperating arm which is biased for switchfopening movement, a generally vhorizontal kpivoted actuating armwhich is separately biased for switch opening movement, a normally underset inverted toggle for releasably connecting the free ends of said arms together for conjointy switch closing l'movementv thereof, a latchpivoted to the free end of said actuating arm having an inclined latch. face `which engages an intermediate point of said toggle in the underset straightened position thereof,

said latch having a depending arm which extends below said actuating arm, a latch crank pivoted. concentrically with said actuating` arm having a depending arm which is par# allel with the `depending' arm of said latch, a link which is parallel with said actuating arm pivotally connecting the depending arms of `said latch and rlatch crank, al stationarilysupported latch' engaging said ylatch crank arranged toy hold said latch crank and consequently through said connectinglink to hold said toggle holding latch in toggle locking position, and means to tripsaid stationary latch and effect the collapse of said toggle.

10. Switch operating mechanism including a pivoted switch operating arm, a pivoted switch actuating arm, means including a nor- .S mally underset tripping toggle'y releasably connecting the free ends of said arms together for con] oint switch closingmovement,

switch closing means operatively connectedv withV ysaid actuating arm, said arms being biased .for movement into a switch open position thereof, means including a latch for normally holding said tripping toggle in setk position, whereby to permit switch closing f movement of said operating arm by a corre- ..5 spondingmovement of said actuating arm, 4

means releasably holding said latch in toggle engaging position including a second latch having a fixed pivotal support, and means operatively connectin'g'said latches, the support for said 'latches land the connecting means therefor being such that the'position of saidvlatches relative toeachother and relative to said toggle remains unchanged durfing the movement of the mechanism between switch open and switch closed positions.

11. Switch operating mechanism including a pivoted operating member, a pivoted 'actuating member, means operatively connecting the free endsof saidmembers for conJo'int switch .closingvmovemena switch closing means for said yactuating member, means constantly' biasing said actuating member `1 in" switch opening direction, a latch carried. by. the `mechanism for holding it closed, a stationary latch having means for holding said first latch against release of said mechanism, and lmeans to release said mechanism including means to trip said sta tionary latch. l

12.- Switch operating mechanism includ`` ing pivoted operating and actuating arms.

separate means biasing them for switch open# p ing movement,v normally 'underset toggle connecting the free ends ofsaid arms, a latchj carried by said actuating arm atitsfree end for-holding said toggle against collapse, said latch'having' an integral yarmy which depends' below said actuating arm', a latch crankk ing said latch crank arm, means constantlyi biasing said latch. crank in a direction to en tionarily-supported latch for effecting the release of said latch crank, whereby to permit said movable latch to release said toggle and permit said operating member to move in a switch, opening direction, means to hold said actuating arm releasably in switch closed"y position during the aforesaid `opening `movement of said operating arm and thereafter tol vrelease said actuating ar-m for switch opening movement, whereby to permit said mech#` anism to move into a reset position. s 13. Switch operating mechanism including pivoted operating and actuating arms, means releasably holding said actuatingr arm inl switchv closed position, a breakable toggle con'-y gage said latch, tripping means for saidsta-f. l

necting said arms and arranged to be setto holdsaid operating arm in switch closed positiony and to break to permit movement of said operating arm to'switch open position, said actuatingv arm being movable independently into switch open position to reset saidtoggle.,

andmeans to hold said toggle from breaking l in both switch open and closed positions comprising a latch pivoted on and movable with saidl actuating arm and releasably engage iro ablefwith` said toggle, a stationarilylocated i latch member and a latch engaged therewith for holding saidl first latch in toggle holding position, and mechanism connecting said latch member and toggleiholding latch for maintaining said toggle holding latch in a definite unchanging relation withsaid latch'member p during movement of said toggle holding latch .between switch open and closedpositionsof the mechanism.

ils

14.-. Switch operating mechanismincluding pivoted operating and actuating arms, lmeans releasably holding said actuating armfin switch closed position, a breakable toggle connecting said arms and arranged tolbe; setto i hold said operating arm in switchclosed position and to break to permit'movementlof said z eperati'ng armr to` switch yopen position,

said actuating arm being movable independently into switch lopen positionfto reset said toggle, means to hold said toggle from breaking in both switch open and closed positions comprising a latch pivoted on and movable with said actuating` arm and releasably engageable with said toggle, a stationarilylocated latch member and a latch engaged therewith. for holding said first latch in toggle holding position, mechanism connecting said latch member and toggle holding latch for maintaining said toggle holding latch in a definite unchanging relation with said latch member during movement of said toggle holding latch between switch open and closed positions of the mechanism, said connecting mechanism including a link pivotally connected with said toggle holding latch and latch member, and said toggle holding latch, latch member, link and actuating arm comprisingf a parallelogram linkage.

l5. Switch operating mechanism including the combination of pivoted actuating and operating levers that are parallel in all operative positions thereof, a breakable connection between them, a. latch carried by one of said levers for holding said connection releasabl7 against breaking, a pivoted latch-holdmg member, a link pivotally connecting said 'latch and latch-holding member and disposed parallel to said latch holding lever in all positions of the latter, and a second latch for releasably holding said latch-h olding'member.

16. Switch operating mechanism as deined in claim 15 wherein said latch-holding member is pivoted concentrcally with said latch-carrying lever. A

l( Switch operatingmechanism including the combination of pivoted actuating and operating levers that are parallel in all operative positions thereof, a breakable connection between said levers including a latch movable with said connected levers for releasably h olding said levers connected, a pivoted latch-holding member, a. link that is parallel with said levers in all operative positions thereof pivotally connecting said latch and latch-holding member, and a second latch for releasably holding said latch-holding member. f

18. Switch operating mechanism including the combination oi pivoted actuating and operating levers that are parallel in all operative posit-ions thereof, a breakable connection between said levers, a pivoted holding member, a link that is parallel with said levers in all operative positions thereof pivotally connecting said holding member and breakable connection, and means Jfor releasably holding said holding meniber. f

ln testimony whereof, I have signed my name to this specilication.

HENRY P. PINKHAM.

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