Dec. 10, 1946. l . T. M. COLE 2,412,494 ELECTRIC SWITCH Filed June 8, 1943 3 Sheets-Sheet l -inulm-\auni *IlMII5 z l = /éq d5 l.. 66 ' THQ/VA s M. COLE :inventor (Ittorneg ' Dec. 1o, 1946. _ T, M, COLE 2,412,494 ELECTRIC SWITCH Filed June 8, 1943 3 Sheets-Sheet 2l 77/0/‘7/15 M. CÚLE ßlwentor Gttorncg Dec. 10, 1946. 2,412,494 T. M. COLE ELECTRIC SWITCH Filed June. 8, 1945 5 Sheets-Sheet 3 w ~ vill/111111111rllnnlillrl‘vll " fllllllllll’l; THOMAS /‘7- COLE ' 3nnentor (Ittorneg Patented Dec. 10, 1946 2,412,494 UNITED STATES PATENT OFFICE 2,412,494 ELECTRIC SWITCH Thomas M. Cole, New York, N. Y., assigner to Cole Industries, Inc., Long Island City, N. Y., a corporation Application .lune 8, 1943, Serial No. 490,019 s Claims. (Cl. 20G-50) 1 This invention relates to electric switches. One object of the present invention is to pro~ 2 ing open and the casing-cover being in its open position; mally prevents the switch casing-cover from be Fig. 2 is a side view of the switch, showing the position of the operating handle in the open con ing opened when the switch is closed and which prevents the switch from being closed when the ted; vide a switch with an interlock device which nor switch casing-cover is open, but which can be released to permit the switch casing-cover to be opened while the switch is closed. In this con nection, it will be understood that it is sometimes ‘ necessary to obtain access to the interior of the switch casing without opening the switch, and it will be understood further that in accordance with this object of the invention, the interlock device while normally operative to prevent the switch casing-cover from being opened when the switch is closed is so constituted as to enable those familiar with the construction of the inter lock device to release the switch casing-cover while the switch is closed, while on the other hand, the switch casing-cover is locked in closed position when’ the switch is closed, so that those dition of the switch, the casing-cover being omit - Fig. 3 is a sectional view on the line 3~-3 of Fig. 1; Fig. 4 is a fragmentary front view of the switch, the casing-cover being in closed position and the operating handle being in switch-open position; Fig. 5 is a sectional view on the line 5-5 of Fig. 1; Fig. 6 is a sectional view on the line 6-6 of Fig. 5; Fig. 7 is a sectional view on the line 1_1 of Fig. 5; Fig. 8 is a sectional View on the line 8_8 of Fig. 3; Fig. 9 is a view similar to Fig. 8, the cover being in closed position; Fig. 10 is a View similar to Fig. 8, the cover being in closed position and the handle being in switch-closed position and the interlock device cover without first opening the switch. 25 being in its normal position for preventing the opening of the switch casing-cover; Another object of the invention is to provide Fig. 1l is a View similar to Fig. 10, illustrating an interlock device which is associated more or the release of the interlock device to permit the less directly with the operating handle of the switch casing-cover to be opened while the switch switch in such manner as to prevent actuation of unfamiliar with the construction or operation of the interlocking devices are not able to open the said handle. More particularly, in accordance ' with the present invention, the interlock device acts more or less directly upon the handle to is closed; Fig. 12 is a sectional View on the line l2-l2 of Fig. 3, the switch being opened; Fig. 13 is a View similar to Fig. 12, the switch prevent opening of the switch casing-cover when being closed; the switch is closed and to prevent closing of the switch when the switch casing-cover is opened, 35 Fig. 14 is a sectional view on the line M-I?ä of Fig. 1; thus eliminating one of the objections to prior interlocking -devices in which the latter are as sociated more or less directly with the switch op erating mechanism, with the disadvantage that such mechanism is partially actuated and apt to be impaired when attempts are made to close the switch while the casing-cover .is open or to open the casing-cover when the switch is closed. A further object of the invention is the provi sion of an improved quick-make and quick-break switch operating mechanism. The above and other objects, features and ad vantages of the present invention will be fully understood from the following description con sidere‘d in connection with the accompanying illustrative drawings. Fig. 15 is a rear view, in elevation, of the in sulation block which carries the stationary con tact members of the switch; Fig. 16 is a detail sectional view on the line lli-I5 of Fig. 1 showing the bearing for one end of the switch operating rod; Fig. 17 is a side View of an insulation disk car rying a movable contact member of another form; Fig. 18 is a sectional view on the line IS--IS of Fig. 17; Fig. 19 is an edge view of the insulation disk and movable contact member shown in Fig. 1'?. Referring now to the drawings in detail, the electric switch embodying the present invention comprises a casing Ill which houses the switch In the drawings: contact members and the switch-operating mech anism. More particularly, the switch proper Fig. 1 is a front View, in elevation, of a switch comprises an insulation block l2 in which are embodying the present invention, the switch be» 235 mounted a plurality of sets of stationary con 2,412,494 3 A tact members It, léa (Fig. 15), there being a companion movable contact member` i6 which, in the closed position of the switch, illustrated in Fig. 3, engages between the companion stationary in open position, detent 65 being projected in re cess 68 prevents movement oi the operating mem ber 3l] for closing the switch, said movement of contact members i4 and Isla. The movable con tact member i6 is carried by an insulation disk I8 mounted on the iiat operating rod 20, so as to be turnable with said rod about the longitudi nal axis of the latter whereby turning movement of said rod about its longitudinal axis in oppo site directions opens and closes the switch. Said rod is mounted at its opposite ends in bearings operating member 3d for closing the switch being in a counter-clockwise position viewing Fig. 8. In order to permit .the switch to be closed, it is necessary to move member 68 from the position illustrated in Fig. 8 to the position illustrated in Fig. 9, whereby to retract or disengage detent St from holding relation with operating member 33. This is accomplished automatically when the cas ing-cover “Si”, which is hinged on the switch cas ing as indicated at ld, is closed. The manner in which this is `acconmlished Will now be de switch casing lil. The switch'proper is of sub 15 scribed. The arm 'i6 of interlock member @il is stantially the same construction as that dis provided with an open-end slot lil and a detent closed in United States Letters l’atent No. portion Si?. The interlock device comprises a 2,289.219, and therefore requires no further de» member 82 illustrated in detail in Figs. 5 to '7. scription. It will be noted that, as in said pat As here shown said member 82 comprises the ent, the bearing members 22 and 24 for the oppo are s 8d and 85 and is pivotally mount-ed on the 22 and 24 which are secured in any suitable way, as by welding the same to the bottom 26 of the site ends of operating rod 2l) are provided with knife edge bearings 28 as shown in Fig. 16 in inner surface oi casing-cover 'i2' by the pin-like reference to bearing member 22, it being under extensions 53 which are engaged in the bearing portions Sii of the holding or bearing member S2 stood that bearing member 2@ is likewise pro vided with said knife edge bearings 28, as illus trated in said patent. which is secured to the inner surface of cover ‘l2 in any suitable way as by a screw 9d. As-shown Referring now more particularly to the oper~ in Fig. 6, arm Sil is provided with an opening 9S. Upon the closing oi cover l2, when the parts are in the position illustrated in Fig. 9, the switch ating mechanism, for actuating rod 2t for'open ing and closing the switch, said operating mech being open, :the edge 88 of arm 3iè- engages arm anism comprises an operating member 33` which 30 'it of member 6% in slot ’i3 thereof and thereby is pivotally mounted adjacent the inner surface swings said arm in a Vclockwise direction, viewing of the side wall 32 of the switch casing on a pivot Figs. S to 10, thereby moving arm tél of member pin 3&3. Said operating member 3@ comprises the Sil from the position illustrated in Fig. S to the disk-like p-art 35 and the radially extending han position illustrated in Fig. Y9, thus releasing de dle part 33 which is preferably integral with part tent ët from operating member St and thereby 35. As illustrated in Fig. 8, a plate @il is fixed freeing said operating member for movement to to rod 2€) and is connected to operating member the switch-closing position illustrated in Fig. 10. 3U by a link d2, one end of said link being pivot ally connected to plate di] by the pin Afl, _and At the same rtime, hook or detent t@ of arm l5 engages the interlock member t2 in the opening the other end of said link having a slot QS in 40 Qt of arm álll‘ of said interlock member, and thus which a pin ¿i8 carried byoperating member 3B is engaged. Plate ¿iii is provided with ?an arm 50 which Vis connected to a spring projected rod 52, said arm 5t being provided with a slot 5L! in which one end of said rod is pivotallyV engaged, the other end of said rod being slidable in a bracket 55 secured to side wall 32 of the casing. The spring for projecting rod 52 and for opposing the move prevents the casing-cover l2 from being opened while the switch is ciosed. It will be noted by reference to Fig. 9 «that when the switch is open, the casing cover can be moved to open position because although detent Sil is engaged in open ing Bt oí detent member 32, detent member 65 can be movedV in a counter-clockwisedirection by the engagement of the inner edge St of member ment of said rod is indicated at 58, one end of Sù with 'the vbevelled edge itil? of detent Bü of said spring bearing on bracket 55, and the other 50 member til, since the open side of recess Yt8 of end of said spring bearing on the end oi the rod member âë is opposite' detent 5t of interlock which is connected to arm 5@ of plate di). It member @il When, however, `the switch is closed will be observed that plate êß and spring pro as illustrated in Fig. 10, detent member St can jected rod 52 constitute a toggle which is over not be moved in a counter~clockwise direction, centered by the operation of operating member since recess S8 is out of registry with detent mem 3@ and that said toggle together with said oper ber @t of interlock member 6@ and said detent ating member provides a quick-make and a quick member is opposed or engaged by the peripheral break mechanism for the switch. Slot 4t in edge of disk portion ät of operating member 3d. member Q2 permits ,the toggle to operate with a As hereinbefore indicated a specialfeature of snap action independently of handle 3S after said the present invention >resides in making provi toggle is overcentered in either direction by op 60 sion to enable the casing-cover to be opened while eration of said handle. The interlock device comprises a member Si) (Figs. 8 to 11) here shown as a bell crank lever pivotally mounted adjacent casing wall 32 on va pivot pin S2 iixed to said Wall. One arm Eli oi' member Eil is provided with a hooked end or de tent portion 66 which is engageable in a recess @3 provided in the peripheral edge of disk part et of operating memb-er 38. Said detent tß'is _ held in said recess by a tension spring ’líì which is secured at its opposite ends to casing wall 32 and to arm tilt, respectively. It will be noted that in the position of the parts illustrated in Fig. 8, the switch being open and the casing-cover being the switch is closed so that those familiar with the construction of the interlock device may open the casing-cover without Vopening the switch. For this purpose, the interlock member is pivot ally mounted as described above and provision is made for access to said interlock member S2 through the closed cover for moving ‘the same to cover-releasing position in relation to interlock member 6G. For this purpose an opening lüi iS provided in the ñange portion It?V and an open ing lll@ is provided in the upper edge of casing Wall 32, said openings being in alignment when the casing-cover is closed. Accordingly, when it is desired to open the casing-cover without 2,412,494 5 6 opening the switch, a pin or a key can be insert-ed the same in a counter-clockwise direction (view sulation block is removably secured to member |32. The end portions |43 are secured to casing wall 26 in any suitable way as by spot welding said end portions |40 to said casing wall. It will ing F’igs. 10 and 11) from the position illustrated in Fig. 10 to the position illustrated in Fig. l1, out of engagement with detent Bil, thus freeing be understood that as illustrated in Fig. 15 and as shown in the above mentioned patent, the insulation block is open at its rear so that it can through openings |04 and IDI to engage arm 84 of interlock member 82 for pivotally moving said interlock member 82 from detent 8B so that the casing-cover can be opened while the switch remains closed. A spring |06 is secured to the inner surface of the casing-cover in any suitable way as by a screw |08 and bears on arm 8S of interlock member |32l for holding said interlock member in the normal position thereof illustrated in Figs. 5 to ’7 and for resiliently opposing the movement of said interlock member for releas ing arm 84 thereof from the detent 8S of the companion interlock member 60. It will be noted that if the switch is closed and the casing cover be removed from the casing without removing operating rod 25 or the movable contact members carried thereby. Said rod extends through said block and is normally positioned in the open-end recesses M2 which are provided in the opposite end walls lili of said block. As shown in the drawings, the cover is provided with a marginal cut-out portion |46 to expose an upper edge portion of disk part 36 of operating member @il and to allow movement of the han dle part 3S of said operating member. The cas The angle between arm 84 and 86 is less than ing is provided with ledge portions |48 and |50 which are engaged by opposite edges of handle part 3S in the closed and opened positions, re spectively, of the switch. Said casing parts |48 and i553 are provided with extensions |52 and i515 which together with the forwardly project ing part |55 of the casing form a slot in which handle part 33 is movable. Said handle part 90° so that when the cover is moved to its closed may be provided with an opening |58 and said positions for engaging interlock member 82 with interlock member 60, the edge 98 of arm 84 en casing part E55 may be provided with openings i513 and S52 to permit the handle part 38 of the gages the inclined edge ||0 of arm 1S of mem- , operating member @il to be locked open or closed by of a lock, not shown. is in open position, said cover can be readily closed merely by moving the same to closed posi tion since the interlock member can move on its pivot over the datent Se to position edge es of arm 84 in slot 18 ofk arm 75 of interlock mem ber 60. ber Gil, without said arm 34 being turned on its pivot by said engagement of said edge of the arm with said edge H0 of member 58. Further by reference to Figs. 1, 2, and 8, it will be noted that the open condition of the switch, detent ;» 3Q is out of the path of arm 84 of interlock mem ber 82 so that when the casing-cover is closed, edge 93 of said interlock member 82 ñrst engages edge | |ii of interlock member ‘Bü and thereby moves the latter in a clockwise direction, view- l ing Fig. 8 for entering detent 80 in opening 95 of interlock member 82. As here shown, a movable latch ||2 is prefer ably provided for holding the cover 'I2 releasably in closed position. Said latch is pivotally mount ed adjacent the inner surface of the end wall lift of the casing by means of a pivot pin |15. The casing-cover is provided with a slot ||8 through which said latch projects when the cover is closed, said latch having a recess |23 in which 50 the wall portion |22 of the cover at one end of In Figures i7 to 19 there is illustrated a mov able contact member of a form which differs from the construction illustrated in Fig. 12 and in the above mentioned Patent No. 2,289,219. As here shown, thel movable contact member lëA is U shaped is iixed to the insulation disk IEA by a rivet the end E12 of said U-shaped con tact member being received in a recess llt pro vided in the edge of disk |8A s0 that said U shaped member cannot turn on said rivet. The free arm portions il@ oi contact member IEA are bent outwardly and thereby spaced from the adjacent surfaces of disk |8A. A U-shaped steel spring member E'ie abuts the outer surfaces of the U-shaped spring member for resiliently op posing the spreading oi portions l‘l‘ti of contact member icA and for holding them firmly in good electrical engagement with the stationary con tact members. Spring member |18 is secured in position by the rivet Ilû by which the movable slot i it is engaged. Said latch is held releasably contact member is fastened to disk ISA. Tongues in position to retain the cover in closed position ¿.353 are struck inwardly from spring member l'lß by means of a spring |24 which is coiled around and engage the sides of movable contact mem pin H5. One end of spring |24 engages a pin ber ¿5A small apertures provided therein as |25 iîxed to casing wall lill and the other end illustrated in Fig. 18. In this form of the switch, of said spring engages latch ||2 in an opening the companion stationary contact member lll’ |28 formed in said latch. Said latch is provided and ita" which correspond to the Contact mem with an upper inclined edge portion |38 which bers lâ and iii-ci, respectively, (Fig. l5) are re is engaged by the edge |22 of the cover at the 60 ceived between the arms il@ and the adjacent slot H3 for moving said latch in a clockwise di sides of disk I3, respectively; in other words, rection, viewing Fig. 3, during the closing of the when the switch is closed, the arms l‘iß of the cover 'l2 to permit said cover to be closed. When movable contact member VSA engage over the the cover is closed and the switch is opened, latch outer surfaces of the companion stationary con member H2 is moved in a clockwise direction, tact members le; and ita’ instead of being re viewing Fig. 3 in order to release the cover so ceived between said contact members as in the that the latter can be moved to its open posi case of the movable contact member iii and the tion. companion stationary members lli and Mia illus As illustrated in Figs. 1, 3 and 12 to 14, the in trated lin Figs. 12, 13 and 15. t will be under sulation block I2 which carries the stationary stood that the insulation disk itiA is mounted on the rod 2S and that in all other respects the contact members of the switch is secured to a assembly of the switch including the modiñed plate |32 which has a raised intermediate portion |34 to provide a space |36 between the inner sur iorm of switch Contact members illustrated in face of casing wall 26 and said raised portion |36 Figs. i? to i9 is the same as that described above with reference to Figs. 12, 13 and 15. Further it for the ends of the screws |38 by which said in 2,412,494 7 ‘will be noted by reference to Fig. 18 that the ends E32 of the stationary contact members are re flexed toward each other so as to more easily enter into engagement with the companion arms H6 of the movable contact member iSA. 8 normally engages said other interlock member in said opening to prevent said cover from being opened to a position in which it releases said other interlock member to permit the casing cover to be opened, said other part of said other interlock member engaging said cover and there by limiting pivotal movement of said other inter While I have shown and described the preferred embodiment of my invention, it will be under stood that the latter may be embodied otherwise lock member in one direction, said other part en than as herein specifically illustrated or described, gaging said cover in the position of said other and that in the illustrated embodiment certain 10 interlock member in which it is interlocked with changes in the details of construction and in the said casing-carried interlock member, and means arrangement of parts may be made without de provided in a part of said operating means en parting from the underlying idea of this inven gageable with said casing-carried interlock mem tion. Also it will be understood that one or more ber for preventing movement of the latter to its features of my invention may be used without 15 releasing position when the switch is closed, said using the other features thereof. Accordingly, as cover-carried interlock member being pivotally these and other changes may be made in -the movable from said position in which it is nor switch disclosed herein as the presently preferred mally engaged by said casing-carried interlock member when the switch is closed and the cover embodiment of my invention, I do not wish to be limited to the invention as speciñcally shown or 20 is in closed position to a position in which it is re described except to the extent which may be re leased from said casing-carried interlock member quired by the scope of the appended claims. Having thus described my invention, what I claim and desire to secure by Letters Patent ist while the switch remains closed, said interlock members being positioned in said casing and Said said cover-carried interlock member being piv switch, and an interlock between said operating means and said casing-cover comprising an inter lock member pivotally mounted on said casing, said interlock member comprising a bell crank lever having one arm thereof provided with a de casing-cover providing access to said cover-car l. In a switch having a casing provided with a 25 ried interlock member, when the cover is closed, cover movable from a closed position to an open for moving the cover-carried interlock member to said last mentioned position thereof. position and means for operating the switch, an 3. A switch having a casing provided with a interlock between said cover and a part of said cover movable from a closed position to an open switch-operating means, said interlock compris ing an interlock member carried by said cover, 30 position, means for opening and closing the otally mounted on said cover and having a part provided with an opening, an interlock member carried by said casing in position to engage said cover-carried interlock member in said opening, said casing-carried interlock member being piv otally mounted on the casing and pivotally mov tent, said operating mechanism comprising an operating member mounted for pivotal movement able from a position in which it normally engages and provided with a recess in which said detent is said other pivotally movable interlock member engageable for preventing pivotal movement of to prevent said cover from being opened to a posi 40 said operating member, a companion interlock member pivotally mounted on said cover and hav tion in which it releases said other interlock ing two arms disposed at an angle of less than member to permit the casing-cover to be opened, 90“, one of said arms having an opening and and means provided in a part of said operating being positioned to engage the other arm of said means engageable with said casing-carried inter 45 bell crank lever and the other of said arms being lock member for preventing movement of the lat positioned to engage the cover for holding said ter to its releasing position when the switch is one of the arms in operative engagement with the closed, said cover-carried interlock member being other arm of the bell crank lever, the other arm pivotally movable from said position in which it of said bell crank lever having a detent releas is normally engaged by said casing-carried inter lock member when the switch is closed _and the 50 ably engageable with said companion interlock member in said opening to hold the casing cover cover is in c_losed position to a position in which closed, said bell crank lever being released from it is released from said casing-carried interlock member while the switch remains closed; 2. In a switch having a casing provided with a cover movable from a closed position to an open position and means for operating the switch, an interlock between said cover and a part of said said companion interlock member when said iirst mentioned detent engages said operating member in said recess whereby said casing Vcover can be moved to open position and said operating mem ber is held against movement to switch-closing position when said cover is in said open position, switch-operating means, said interlock compris and said operating member having a part en ing an interlock member carried by said cover and pivotally mounted thereon, an interlock 60 gageable with said ñrst mentioned interlock member to prevent movement thereof for releas member carried by said casing and pivotally ing the companion interlock member when said mounted thereon in position to engage said cover operating member is in the switch-closed posi carried interlock member, said casing-carried in terlock member having a detent at one end there of and said cover-carried interlock member hav ing a part provided with an opening and another .part in angular relation to said iirst mentioned part, said casing-carried interlock member being movable from a position in which said detent 70 tion thereof, said interlock member being releas able in the closed condition of the switch by piv otal movement of said companion interlock mem ber for withdrawing said one arm thereof from said engagement by said detent. THOMAS M. COLE.