US1774540A - Locking-type switch-operating handle - Google Patents

Description

Filed Nov.` 3, 1927 '7 Sheets-Sheet I ,alf/7655,' /f

Sept. 2, 1930. A. ALsAKER Er AL 1,774,540

LOCKING TYPE swITcH OPERATING HANDLE Sept. 2, 1930. A. ALsAKER ET AL LOCKING TYPE SWITCH OPERATING HANDLE Filed Nov. 3, 1927 '7 Sheets-Sheet l i .3/ l I UHU/H? A 1 1 l T S2M/3 m 'bag Sept. 2, l1930. A. ALSAKER ET AL. 1,774,540

LOCKING TYPE SWITCH OPERATING HANDLE Filed Nov. 3, 1927 7 Sheets-Sheet 4 l @d fa Sept. 2, 193D. A. ALsAKER ET AL LOCKING TYPE SWITCH OPERATING HANDLE Filed Nov. 3, 1927 7 Sheets-Sheet 5 V 7- %fe" 75 ya 105 Y cnvenz'w I 1 d! red L#sa er @fa-55, E'fc ./Vardem Mm @M Sept. 2, 1930. A. ALsAKER ET AL 1,774,540

LOCKING TYPE SWITCH OPERATING HANDLE Filed Nov. 3y, 1927 7 Sheets-Shea? 5 Eric /VOrCZ/em LOCKING TYPE SWITCH OPERATING HANDLE Filed Nov. 3, 1927 '7 Sheets-Sheet 7 Patented Sept. 2, 1930 UNITED STATES ALFRED ALSAKER AND ERIC NORDHEM, OF CHICAGO, ILLINOIS, ASSIGNORS TO THE DELTA STAR ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLI- Nors' LOCKING-TYPE SWITCH-OPERATING HANDLE Application led November 3, 1927.A Serial No. 230,760.

rThis invention relates to switch operating means, and more particularly to a handle adapted for connection to a switch remote from the handle through a suitable system of links and levers, means being provided for iocliing the handle in any one of several sefected positions.

Uur invention has to do primarily with the locking means for securing the handle struc ture in adjustment. By our invention we provide a key operated lock and means associated therewith whereby the handle structure can be positively locked against operation so as to eifectually prevent unauthorized opening or closing of the switch. In conjunction with the locking means we also provide, in one form of the device, electro-responsive means for preventing release of the handle structure by operation of the key operated lock until such time as the oil switch, or other apparatus used for interrupting the line current and situated remote from the disconnect switch which is operated by the handle structure. has been opened. After this has been done, the electro-responsive means is actuated to permit release of `the handle structure for closing or opening"- the disconnect switch. We also contemplate a further modification in which air-auxiliary switch controlling one or more` interlocking or signalling circuits is connected to the lock controlled means in such-manner that the condition of the disconnect switch operated by the handle structure will be properly indicated at a point remote from the handle structure, and the fact that the handle is to be operated for closing or opening the dis connect switch will be signified at such point before operation of the handle structure actually takes place. Further objects and ad vantages will appeal' from the detailed description.

In the drawings Fig. 1 is an elevation of a handle structure in accordance with our invention;

is a side View of the'handle struc in section Fig. 5 is a horizontal section through the j handle structure and arm and the support-r ing base;

Fig. 6 is a section taken substantially on line 6-6 of Fig. 4, on an enlarged scale;

Fig. 7 is a transverse section through the supporting base taken in the plane of the lock and the locking cam member, parts being shown in elevation;

Fig. 8 is a. transverse sectional view through the switch housing taken adjacent the upper end thereof and looking down;

Fig. 9 is a section taken substantially on line 9 9 of Fig. 8;

Fig. 10 is a section taken through the auX- iliary switch structure substantially on line 10-10 ot' Fig. 9; 1

Fig. 11 is a section taken substantially on line 11--11 of Fig. lt);

Figj12 is a section taken substantially on line 12-12 of Fig. 10;

Fig. 13 is a section through the supporting base and associated parts showing the stop elements for preventing and limiting entry of the pawl into the apertures of the hub of the handle member, the auxiliary switch and associated parts being omitted;

Fig. 14 is a perspective detail of one of the pawl limiting member-s;

Fig. 15 is a vertical vcentral sectional View through the supporting base and associated parts from front to back of the base, illustrating the second modified form, parts loeing shown in elevation;

Fig. 16 is a side view of the form of operating handle structure illustrated in Fig. 15;

Fig. 17 is a section taken substantially on. line 17-17 of Fig. 16; Y

Fig. 18 is a section taken parallel to and adjacent the cover of the electromagnet housing in the form shown in Fig. 15, the base being shown ragmentarily;

Fig. 19 is a vertical central sectional view through the lower portion of the base and the electromagnet housing, parts being shown in elevation:

Fig. 2() is a section through the electromagnet housing and associated parts taken substantially on line QO-QO of Fig. 1S;

Fig. Z1 is a diagram showing the lock actuated switch connected to control an oil switch, the signalling circuits controlled by tlieloc'k switch being omitted for clearness; and

Fig. 22 is a diagram of the connections for the electromagnetic lock used in the switch illustrated in Figs. 15 to Q0.

The device includes a base member' 1 having a flange Q secured by means ot cap screws 3, or in any suitable or preferred manner, to a base member or block adapted to be secured to a wall support in any suitable manner. Base member 1 is provided in each side thereof, with a forwardly projecting standard 5 carrying a bearing sleeve G. A lshort length ot tubing forming a shaft 7 is rockably mounted through the bearings 6 and projects beyond the same to one side ot base member 1. in operating arm 8 is secured on the projecting portion of shaft 7 by means of U-bolts 9 and set screws 10. This arm is bifurcated to receive one end of a curved link 11 pivotally secured between the members of arm 8 by a pin 1Q held against endwise movement by cotter pins, or in any other suitable manner. Operating arm 11 is provided at its other end with a socket member 13 in which is secured an operating rod 1-1, the other end ot` which is connected, in any suitable manner, to a suitable system oi links and levers for operating a. disconnect switch disposed at a point remote trom the operating handle structure. By rocking the shaft 7 about its axis into its extreme position iu either direction, the switch can be easily opened or closed, as required.

Shaft 7 is operated by a handle structure This structure includes a rod or shank 1G provided at its upper end with a spade handle 1T. A hub 1S is provided at the lower end of shank 1G. this hub having a socket member 19 in which the shank 1G is secured by rivets '2O (Fig. or iu any other suitable manner. The huh 18 is bored and threaded.v adjacent socket member 19. for reception of dog point set screws 21, the points ot which enter corresponding openings in shaft T. This serves to eiiectually secure the handle structure to the shaft tor operating .the latter.

adapted for reception of a nose element 23 of a holding pawl 24 rockably mounted on a pin Q5 extending transversely ot the base 1 above shaft 7. 1t will be noted that the openings 22 are of approximately segmental shape and converge inwardly of the hub, the element Q3 being shaped lsimilarly to the opening and of somewhat less width. This renders it possible to force element Q3 out of the opening 2:2 when the pawl 2-1 is released by exerting appreciable pressure on the contacting inclined surfaces ot' element 23 and the wall of opening 22 with which this element contacts. It will thus be seen that, when the pawl is released, the hub 18 can-die turned into either position desired by first releasing it from the pawl which may be readily accomplished by exerting aslight pull upon the handle 1T.

For locking the pawl 24 in holding or operative posit-ion 1 provide a cam 2G trom one side of which extends a stub shaft QT which is rockably mounted in a tubular boss 2S projecting inwardly from one side of the base member 1. This cam is positioned and adapted to be turned into and out of operative relation to a finger element Q9 extending from the free end ot pawl 21. the lower portion of this element heilig provided with an arcuate recess for reception of the cam. Then the cam is in operative position, the pawl is effectually held against outward movement and is retained in operative positionuwith the element 23 disposed-in lone ot the openings '22 locking the hub. and, consequently7 shaft. T, in adjustment. By turning the cam into inoperative position the pawlis released and can be moved out of operative engagement with the hub in the manner previously described.

A key operated lock 30 is mounted in the other side wall of the base member 1. This lock includes` an outer fiange 31 and a. body 232 which passes through an opening in wall 1A, this body being provided, at its inner end, with outwardly projecting diametrically opposite lugs 33. A U-shaped clamp 34 straddles body 212. this clamp being provided at the end of each arm with a rounded finger bearing upon the inner A pressure screw 3C is 1 face of wall 1A. threaded through the bight portion of the, clamp and bears against the bottom wall ot a recess provided in wall 1A for reception of this screw. This provides simple and ei'iicient means for securing the lock in the base member.

The lock used is a standard make of Yale lock made by the Yale & Towne Company. This lock is ot the cylinder type and includes a rotary barrel or cylinder 8T which projects inwardly beyond the inner end ot body 3Q, this cylinder receiving at its outer end the key. rotation of the cylinder when the key is withdrawn being prevented by the pins or tumblers of the lock in a known manner.

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. 49 at right angles thereto.

Cylinder 37 is connected to cam member 26 by a connecting rod 38. This rod 1s provided at one end with an L-shaped member 39, one arm of which engages into a recess in cylinder 37'. An angle plate 40 fits about the lower portion of cylinder 37, as considered in Fig. 7, andis Secured to the c linder by a screw 41. This plate" abuts the at surface of the outer arm of member 39 and serves to hold this member against undesirable looseness or play. At its other end the rod 38 is provided with a diametrically extending rib 42 from the central portion of which projects a reduced pin 43. Rib 42 ,fits into a groove 44 provided in the inner lface of cam 26 and the pin 43 extends into a recess or bore extending from the bottom of this groove. In this manner the cylinder -of the lock and the cam member 26 are operattively connected to ether so that the cam member will turn with the cylinder and will be secured by the cylinder against turning 'movement when the key of the lock is withdrawn and the cylinder is locked against movement. The lock thus forms key operated means for operating and controlling the cam member and, consequently.. the release and locking of the handle structure.

A coiled torsion spring 45 is mounted about rod 38 and is confined between the cam and an ieye 49 of an arm 50 the other end of which fits into a groove in a pin 51 projecting laterally from pawl 24 (Fig. 4 and Fig. 6). A finger 52 extends inwardly from eye This finger is provided in its inner edge with a notch (Fig. 5) which receives one end of the torsion spring 45. The other end of the spring engages about a pin 53 projecting inwardly from the inner face of cam 26. By reference to Fig. 3 it will be seen that the torsion spring urges the cam member in a clockwisedirection and the arm 50 in a counterclockwise direction so as to urge the pawl 24 toward hub 18. Movement of the cam in clockwise direction will be limited by movement of the cylinder of the lock which is not permitted to turn in such direction beyond full locking position. If desired, the cam member m'aybe provided with a stop element or pin disposed for contact with the terminal element 29 of the pawl for limiting movement of the cam member in locking direction though, under ordinary conditions, we do not deem this necessary. With the parts in the positions shown in 3, the handle structure and shaft 7 are e ectually held by the pawl 24 in switch closing position. When it is desired to open the switch, the key is inserted in the lock and the cylinder thereof is turned in proper direction to turn the cam member through an arc of approximately 180 degrees in a counterciockwise direction, as considered in Fig. 3, releasing the pawl 24 and permitting movement thereof away from the hub sufficiently to disengage element 23 from its recess. After the hub has beenturned a short distance,'the key in the lock may be released, as return of the pawl to locking position will be prevented by contact of element 23 with the hub. `lVhen the shaft has been turned into full switch opening position, the other urecess or opening 22 of the hub is brought into alignment with element 23 of the pawl which is then moved inwardly by the spring to position element 23 in the opening. This releases Fthe cam member which is then returned to locking position by the spring. In

this respect the locking mechanism is automatic in its operation in that it is held inoperative during movement of the shaft from either of its extreme positions to its other extremeposition, and is then actuated by the spring to lock the shaft against movement. We have shown the hub 18 as provided with a third recess or opening 22A midway between the two openings 22. This central opening may be employed whenever it is found necessary or. desirable, be-' cause of restricted space or for other reasons, to lock the handle structure in substantially horizontal position, that is, in position midway between its two extreme positions. W'hen it is not desired to use the opening 22A it may be closed or rendered inoperative by means of an arcuate closure plate 54 of a size to fit snugly in the outer portion of this opening, this plate being secured in position by a screw 55 passing therethrough and 1U;

threading into a clamping plate 56 disposed inside ot the body of hub v18 between the same and shaft 7. To accommodate this clamping plate the hub 18 is provided, at each end thereof, with an inwardly projecting flange 18A, these fianges and the body of the hub enclosing an annular space 57 about the shaft. This structure will be clear from reference to Fig. 5. At times it is desirable to provide means whereby the key cannot be withdrawn from the lock except after the switch is closed. It is also often convenient to permit the key to remain in the lock, particularly when the switch is to be open but a short length of time, as this prevents loss of the key and insures that it is readily available when it is desired to close the switch. `With this object in view we provide means whereby entry of the element 23 of pawl 24 into the opening 22 is limited. In

Figs. 13 and 14 we have illustrated a stop member including an arcuate base 58 and a body 59 of a size to be inserted into the inner portion of opening 22 from inside the hub. The base 58 corresponds in thickness to the width of space 57 radially of the hub and is disposed concentric with the shaft andl the hub. This member is applied before the hub is mounted on the shaft and is held in position by the shaft, as lwill be clear from i ecl xvi `i` i m eei'entrie o i'.

uf oi the umn in inciting; lieieniljif to loi-li the inurl against outward niowinent whie preventing turning o' the. ouin into t'nll oeking' position. This Serves to hiel; the hnh again@ niooinent 'n either direction and :11S-o prevents iif'ithdrzzwni ot the lier troni theI lovl, it. being" 'd nierstofjic that the liey Cannot, he witlnlrzin'n Yfrom th, loci; until the eyliiuler oi thel loi-l; has heen tnrneil into i'nil locking position in zieeorclzinee with the eonnnon practice in ioeks oi alf, type. wYhen it is desired to eioe the switch. the lock is operated to reieuse the piiWl mul the ininille s'ruenre is then returned to Switch eiosin;r poeiiion, utter which the koi; is relezisei'l zinil the Carin f etnrneil l the torsion spring to full operative or locui position,n after which the lief; nur,v 'ne n nirunn troni the leek.

.it is frequently fiesiruhle in notifyQ parties n suh-stution or sonic pnini remote from m'itrh. ot? the eonilition oi" the whether they switf'h i'loseii ig or open. it muy :liso he VIfound ileeirnhhto i'liivifle menne for notifying' parties nt the iiiei'onnw switch operzing iminlle oi the i ion oi the line zweiten. i'itli these ohin nien" ne eonteniplnte inirvifling in ont'olling Sign-ailing or inthi 4 auxiiinry switrh he ieioei( operatori means i'or in. iv.

i' io Li iwill nienihe'.' or liiovi; sinh) liu nonne;

The Sii'iteh r..- eiiuie rertzingninr 'tranne il of nl isiilior-hronxe or other :nimble inuterinl. @un piniw: or elw-urli nieniiiere /i'ff im'nieii of vonnnerrizilli' suitfihle "or insuiuting inzittrizii. :ire seinreii to te ahh@ oi irine 7l hi' nro@ A ilu iilzztes. :imi threuiling inw the iii'iieneil eoi'nei's: of the. irsnne. Ain operati r ir: siiilzihl): mounted thronfgh the oniis of the frnnie Tl. the 'free enil portion i': of this roll heine rei'lneeil in iliznneter, :le ilinf-lti'nteil in Fig. i?. nl '-i thiezitiw throngh the vent nl portion ot i iiloel 3 oi' un):

snit- :ihie insulatingr iniiteriuh mui. es iiher. vl Synthetic resin known @in hal-rente. hioel; in provided. :nijneent mieli e i hoi-e exieuiinjg through the bloei( troni fiile to iile thereof. short pin Ti other oleetrii'nl insulriting nniter hh' mounted in each bore :ind ivan-illy hy :in expansion eoii epi-ing T3, also mounted in the hore. The pins and the epringjs, are Confined between trio contact stripe Tf) of sonner or other suitable eietrieal eonfiiuting; ninterizih these strips seating in reitnngnlzir grooves 8O extending from front to hack of the interni tures of the nloek und interseetiingthe bores thereof. lach strip l') is provideci, in its inner tace :1nd adjacent eheh end. with ii recess Si, these recesses: ie-

izil is Sl'ilzieeiving the end portions of the pins 7T :1nd the springs T8 Which Seat therein, Movement ot the Contact strips 79 inlay from the block 76 is positively limited hy the plates 72. The springs and the pins :iet to press` the strips outwurdly into Contacty with the plates TQ and also serve to liohi these strips ngninet endwise movement. AS will he noted more. lean-ly from Fig. l2, the springs :nul the pins in the bores o' the hloek are oppo- Sirely related so that each Contacty strip is held in position unil nrgeil outwardly by n nin :nifl u. spring in direct engagement therewith.

plurality, in this ense four, of terminal plates 72. so that, upon movement of the block 76 into its extreme position in either direction, two sets or pairs ot the terminal members are. connected electrically through the contact strips 79. This provides simple and efhcient means for controlling a plurality of interlocking or signalling circuits by movement ot' the block 76. B v referring to Fig. 3. it. will be noted that the switch operating rod 71 is connected bv a. link 86 to pin 53 ot the cam 20. When the handle structure is in position closing the disconnect switch. the block 76 is raised and the coutact strips close the proper circuits to signify this` fact. Then it is desired to open the contact switch it is necessary to first unlock the holding pa wl 24 by turning the cam member in a counterclockwise direction, as considered in Fig. 3, through an arc of approximately 180 degrees. This movement of the cam member serves to move the block 76 into its lower position closing the circuits controlled bythe lower pairs or sets of terminal members andsignalling the v'intention to open the disconnect switch. If, for any reason, the disconnect switch should' not be opened, this factcan be signified by a suitable signal operated from a sub-station orsome point remote from'the switch operating handle structure, .this signalling means being included in one ofthe-circuits controlled by the auxiliary switch. In this connection it is important to note that the pawl 24 is not released until after the block 76 has been lowered sufficiently to connect the lower terminal members through the contact strips 79. Movement of the insulatingy block in either direction is limited by abutment elements 87 adjacent the 'corners of frame 71. The threaded connection between the operating rod 74 and the block permits of adjustment between these two members to obtain accuracy in operation ot' the switch without interfering with the properoperation of the cam 26, and the connectionsbetween the movable member'of the switch and the cam assure that the switch will be operated only at proper times and by a properly authorized person.

In Figs. 15 to 20 we have illustrated a moditied form in which the opening of the disconnect switch can be positively prevented from a point remote from the operating handle structure. A. latch 88 is pivoted at one end at 89 on a. pin 90 projectingr from the lower wall of base member 1. This latch is loosely connected at 91. to one end of a rod 92, the other end of which is secured to one arm of an L-shaped lever 93 secured in a U-shaped stirrup 94 rockably mounted on a pin 95 extending transversely of a housing 96 secured to the lower end portion of base member 1.

An electromagnet of suitable type is mounted within the housing 96. This electromagnet includes a core formed of two substantially U-shaped members 97, the outer arms of which are secured by screws 98 to brackets 99 secured by screws 100 to the inner wall of the housing. The inner arms of the members 97 are secured togetherv in any suitable manner as by riveting (Fig. 20) and these members form a core within which is disposed the coil 101. The terminals of this coil are connected to binding posts 102 carried by a cross bar 103 .of any suitable electrical insulating material such as the synthetic resin known as bakelite, this bar being secured between the side walls of the housing in any suitable manner as by screws 104. A cover plate 105 is secured over the front of housing 106 by means of screws 107 passing through this plate and threading into the members 97, this plate being provided with suitably disposed flanges about its periphery lor properly positioning it. well as the rod 92 and latch member 88 are preferably made of brass or other suitable non-magnetic material, and an armature 107 of sott iron or other suitable magnetic material is secured across the lower end ofthe lever 923 and is disposed adjacent and in alignment with the inner pole of the electro- The lever 93, as l magnet. The electromagnet is normally energized so as to hold the armature 107 in its raised or outer position. This holds the lever in rocked position about its pin 95 and disposes the bill 88A of latch member 88 in position for engagement with a pin 108 secured in cam 26 and projecting therefrom atthe same side as the pin 53. `This pin 108 is so disposed as'to engage with the latch member before the cam has been turned intofull unlocked or pawl releasing position. It will thus be seen that it is impossible to release the handle structure until the circuit through the coil of the electromagnet is broken. This circuit is preferably so arranged that the electromagnet is energized continuously as long as the line switch is closed. This provides a very effective safety control which will prevent opening of the disconnect switch until the line circuit has been broken or opened.

In Fig.`2l we have illustrated diagrammatically the application of our opera-ting handle and associated lock actuated switch lto a high tension bus circuit the diagram being of the conventional one line type, the disconnect switch being indicated as gang operated. When handle 15 is raised, as indicated in dotted lines, the disconnect switch 110 is closed, closing the bus circuit from bus 111 through wire 112 to the oil switch 113, from which it extends to the load after the oil switch is also closed. To open the disconnect switch it is necessary to first operate lock 72fto turn the cam 26 into inoperative position to release the pawl 24. This moves strip 79 into contact with the Contact members 84. The circuit of the trip coil (not shown) of the Oil Switch iS then Closed from the positive operating bus 114 through wire 115, strip 79, lead 11G. wire 11T. trip wire 118, the trip coil, and the common wire 119 to the negative bus 120. This opens the oil switch before it is possible to open the, disconnect switch, rendering it impossible to open the disconnect switch under load. As the handle '15 reaches its full switch opening position, the contact strip TD is rcturned to raised or inoperative position. per mitting closing of the oil switch. Before the handle can be returned to switch closing position it is necessary to again operate the lock T2 closing the circuit of the trip coil of the oil switch as before and opening the oil switch before it is possible to close the disconnect switch. It will thus be seen that, by the provision of the lock actuated switch and associated parts, we provide simple and efficient means for preventing either opening or closing of the disconnect switch under or on load.

An overloadrelay 121 is connected to the high tension 'bus wire 112 through a suitable transformer in a known manner. This relay acts to normally hold a contact strip 122 away from contacts 123 which are connected in shunt with wire. 115 and about contact members 84. In the event of an overload, the strip 122 is shit'ted into position to bridge the contacts 123 closing the circuit of the trip coil of switch 113 from positive bus 111 through wire 115. wire 11T and strip 122, trip wire 118 tothe coil, and common wire 119.to the negative bus 120. As the overload relay is shunted around the lock actuated switch of the operating handle` it can operate at any time regardless of the. condition of the disconnect switch.

Il control switch 124 is provided for opening and closing the oil switch. When the control switch is on contact 125 the circuit of the closing coil of the oil switch is closed from positive bus 114V through wire 12C. closing wire 12T and the closing coil to thev common wire 119. and through wire 1151 to the negative bus 1211. rl`o open the oil switch` cont-rol switch 12st is moved into contact- 12S trom which extends trip wire 11F. rlhis closes the circuit ot the trip coil from positive luis 111 through wire 126 and switch 124, trip wire 118. the trip coil, and through the common wire 119 to the negative bus 1211. opening the oil switch.

Two pilot lights` one red and one green. as indicated. are connected in scrics with wire 126 and wires 118 and 12T. respectively. v'sllhen switch 12J.- is open both of these lights are illuminated. their circuits being closed through the trip coil and the closing coil. respectively. of the oil switch. ance of these lights is sntliciently high to preventr the. nov-r of sulficicnt current to 'tl coils to operate the switch. as is well e stood in this e ilhen switch is in The resistengagement with contact 125 for closing the oil switch. it shunts the green light which is thus extinguished. leaving only the red light illuminated. Upon movement of switch 124 into engagement with contact 1251 to open the oil switch, the red light is shunted. leaving only the green light on. These lights are suitably disposed to indicate to the operator the condition of the control switch and, consequently, of the oil switch.

ln Fig. 22 the disconnect switch is shown as closed. The coil 101 of the electromagnet is energized through the medium of a potential transformer 130, the primary coil of which is connected at one end to wire 112, the other end of this coil, as well as the corresponding end of the secondary coil, being grounded at 131. The other end of the secondary coil of the transformer is connected to one end of coil 101 which has its other end grounded at 132. When the oil switch is closed. the electromagnet is energized preventing opening or closing of the disconnect switch in the manner previously described. This renders itimpossible to either open vor close the disconnect switch under oron load.

As above indicated. and as will be understood by those skilled in the art, changes in construction and arrangement of parts of our invention may be -.resorted to without departing from the field and scope of the saine, and we intend to include all such variations. as fall within the scope of the appended claims. in this application-in which the preferred forms only of our invention have been disclosed.

llihat we claim ist- 1. ln switch operating means, a handle structure including a huh mounted for turning movement, a pawl, said huh and the pawl having co-acting means for locking the huh in adjustment, said pawl being biased to the locliing position. and cani means for rigidly holding the pawl in the locking position.

ln switch operating means. a handle structure including a hub mounted for turning movement, a switch operating arm having operative connection with the hub. a holding pawl adjacent the huh` said pawl and the huh having co-acting means for l'iolding the hub in adjustment. and means 'for ioclting the. pawl against retraction 'troni the holding position.

2l. `ln switch operating means. handle structure including a hub mounted for turning movement, a switch operating arm having operative connection with the huh, a holding pawl adjacent the huh. 'il pawl andthe huh having co-acting means `for molding th.l huh in adjustment. and lo/.dr-controlied means for locking the pawl against retraction from the holding position.

s1. ln switch operating' means. a

mounted shaft, a switch operating are.

cured on said shaft, a handle structure including a hub secured on the shaft and provided with spaced recesses. a holding member movable toward and away from the. hub and. having an element disposed to project into the recesses of the hub for securing i't in ad justment about. its axis the recess and the pawl being relatively shaped to exert an outward force on the pawl upon the application of pressure thereto by the huh, and lock con trolled means for securing the holding niember inoperative.

5. In switch operating means, a supporting base. a shaft rockahly mounted in the hase. a switch opeiating arm secured on said shaft, av handle structure including a huh secured on the shaft and having spaced reL cesses, a holding pawl mounted in the hase and having an element. disposed to project into said recesses. said pawl'being urged toward the hub, and lock controlled means for locking the pawl in position in the recess.

(i. In switch operating means, a supporting hase, a shaft rockably mounted in the hase, a switch operating arin secured on said shaft, a handle structure including a hub secured on the shaft and havingspaced reccsses, a holding pawl mounted on the base and having an element disposed to project into said recesses, said pawl being urged toward the hub and the element of the pawl being shaped to be forced out of the. recess by Contact with the wall thereof upon turning of the shaft in either direction under appreciable pressure, and lock controlled means for securing the pawl in operative position.

7. In switch operating means, a support ing base, a'sliat't rockably mounted in the base, a switch operating arm secured on said shaft, a handle structure including a hub secured on the shaft and provided with spaced recesses, a holding pawl disposed for engagement. into said recesses and urged toward the hub, a key operated lock, and a locking member operatedby the lock and movable thereby into and out of position to hold the pawl in position in the recess.

8. In switch operating means, a supporting base, a shaft rockably mounted in the base, a switch operating arm secured on the shaft, a handle structure including a hub secured on the shaft and provided with radially disposed recesses, a pawl mounted in the hase and having an element. disposed for engagement into said recesses, the pawl being urged toward the hub, a` cam meinbenmounted in the. base for movement into and out ot' position to hold the pawl against retraction from the hub, a lock mounted in the base, and operating connections between the cam and the lock.

il. In switch operating means, a rockably mounted shaft, a switch arm secured on the shaft, a handle structure including a hub secured on the shaft and having recesses, a pawl yieldingly urged toward the huh and having an element. engageable into said recesses and shaped to be forced out of the saine by contact` of the walls of the recess with said elcineiit under appreciable pressure, a cam mounted and disposed for movement into and out of position to hold the pawl in operative position, and vielding means urging the cam into pawl holding position.

l0. In switch operating means, a rockahly mounted shaft. a switch arm secured on the shaft, a handle structure including a hub secured on the shaft and having recesses, a pawl yieldingly urged toward the hub and having an element engageable into said rccesses and shaped to be forced out of the same by contact ot' the. walls of the recess with said element under 'appreciable pressure, a cani mounted and disposed for movement into and out of position to hold the pawl in operative position, yielding means urging the cam into pawl holding position, and a lock liav ing operating connection with the cam for moving it into inoperative position and sceuring it. in operative position.

1l. In switch operating means, a roekably mounted shaft. a switch aiiii secured on the shaft. a handle structure including a hub secured on the shaft and having recesses` a pawl having an element engageable into said recesses, means for optionally preventingr complete entry of said element into a selected one of said recesses, a cam mounted and disposed for movement into and out of position to hold the pawl in operating position. a hey operated lock having a movable key receiving member, and operating connections between said member and the cani.

1Q. In an electric switch, switch operating means, a pawl normally urged into a position to prevent the operation of the switch, said pawl being `retractable from said position rc.- sponsive to the attempted operation of said means, and key operated locking means for preventing the retraction of the pawl.

13. In an electric switch having a predetermined numhcr of selectively operated positions, a pawl normally urged into a position to prevent the operation of the switch from any one of the selective positions in which it happens to be, said pawl heilig retractable from said position responsive to au attempted operation of said switch. said pawl being ineffective while the switch is in a position intermediate an operated position, and automatically effective upon the switch reaching an operated position, and key operated locking means for preventing the retraction ofthe pawl. i

14. In an electric switch having a predetermined number of selectively operated positions, and a number of spaced recesses, one for each position of the switch, a pawl normally urged into said recesses and retractable responsible to an attempted operation of the arms projecting from said base, bearin journaled in said arms, a shaft mounted 1n said bearings, a disconnect switch operating mechanism connected to said shaft and p- 5 erated thereby, a handle structure including a hub mounted on said shaft for actuating the same, cam means for preventing actuation ot' the shaft, means controlled by the handle for releasing the cam means, electromagnetic means and separate key controlled means cach controlling the release of said cam means by the handle.

27. A switch operating structure comprising a handle having a hub mounted for turning movement, a switch operating arm having operative connection with the hub, a ,i holding pavvl adjacent the hub, said pawl and the hub having coacting means for holding the hub in adjustment and being shaped to force the pawl out of engagement with the hub upon the application of pressure thereto by the hub, and means for locking the pawl against retraction from the holding position by the hub. g5 28. A switch operating mechanism comprising a handle structure including a hub mounted for turning movement, a switch operating arm having operative connection with the hub, a holding pawl adjacent the 3o hub, said pawl and the hub having coacting means for holding the hub in adjustment, said hub constituting means for retracting the pawl, and lock-controlled means for Securing the pawl against retraction from the holding position. E29. A switch operating mechanism conlprising a supporting base. a shaft rockably f, mounted in the base, a switch operating arm secured on said shaft, a handle structure in- 4u cluding a hub secured on the shaft and having spaced recesses, a holding pawl mounted in the base and having an element disposed to project into said recesses, said pawl being urged toward the hub, and lock-controlled means for securing the pawl in operative position, said recesses urging the pawl outward upon the application of a turning force on the hub.

30. A switch operating mechanism comprisinga supporting base, a shaft rockably mounted in the base, a switch operating arm secured on said shaft, a handle structure including a hub secured on the shaft and provided with spaced recesses, a holding pawl disposed for engagement into said recesses and urged out of engagement therewith by the hub structure, said pawl being biased toward the hub, a key operated lock, and a locking member operated by the lock and mov- Wl able' thereby into and out of position to hold the pawl in its operative position.

ln witness whereof, We hereunto subscribe our names this 9th day of September, 1927.

ALFRED ALSAKER. ERIC NORDHEM.

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