Document n9OgoRYX93dX39BXnNJE99mm2

Patented June 6, 1933 1,912,610 exhibit UNITED STATES PATENT OFFICE JtJXES A. WISHES, 07 PSTBOZF, XICBZOAK, ASSTSHOB TO BOT7ABZ Z> OOKPAKT, 07 detkoit, Michigan, a cobtobatxoh 07 Michigan ELECTBICAL DEVICE Afplicaliaa. lied lt074Ser 7, 182?, Serial m. 231.001. My invention relates to electrical devices of the electrical circuits of a system with and nas particular reference to switches for which my invention is adapted to be utilized. controlling motor circuits and the like. Referring to the drawings, an electric One object of my invention is to provide switch 1 having stationary contact members s a switch for controlling an electric circuit 2 and movable contact members 3 is mount- 55 comprising protective means responsive to ed on a base member 4 that is secured to a condition of the circuit to be controlled the rear wall of a casing 5 by means of bolts and means for readily varying the setting 6 and nuts 7 and is separated therefrom by of the productive means to cause the same means of spacing members 8. The provision 10 to control the operation of the switch in any of the base member 4 permits ready assem- o desired manner. bly thereon of all the apparatus that is to Another object of my invention is to pro be enclosed by the casing 5. Such apparatus vide a switch of the above indicated char may then be inserted in and removed from acter wherein protective means responsive the casing 5 as a unit, and is adapted to be is to a condition of the circuit to be controlled secured in position and released, as desired, 55 are adapted to be returned to operative con simply by manipulating the nuts 7. dition after an operation thereof, either au The stationary contact members 2 are. se tomatically or in response to the operation cured by screws 9 to conducting members 10, of a manually operable device. which, in turn, are secured to individual 20 Other objects and advantages of my in insulating base members 11 by screws 12 70 vention will be seen from a consideration of and 13. Each of the contact members 2, the following detailed description taken in may, therefore, be quickly removed by re connection with the accompanying drawings, moving the proper one of the screws 9^ and in which: ,, may be replaced by manipulating a single 25 Figure 1 is a perspective view of the screw. Arc barriers 14 of suitable material, 75 switch embodying my invention with the such .-is lu-iiesios compvsiliOL. are diprt^t cover member of a casing therefor in open bf-i '-nr; liji; so vend stath-iia-Ty -nitact mem- position; li-.r-- " an-1 the lute** nji'csbers il * f HTef-vr, Fig. 2 is a sectional view taken along the The several base members 11 and barriers 14 so line II--II oi Fig. 1, with certain parts are assembled as a unit and secured together so broken away; by means of a holt or rod 15 and a nut 16 Fig. 3 is a fragmentary sectional view therefor. Rotatory displacement of the base taken along the same line as Fig. 2, and members 11 with respect to the barriers 14 showing certain parts in different operative is prevented by projecting shoulder portions as positions from those shown in Fig. 2; 17 of Hie base members 11 which extend over 85 Fig. 4 is a fragmentary sectional view the ends of the barriers 14 The rod 15 taken along the line IV--IV of Fig. 1, and also secures in position, with respect to the showing an auxiliary switch embodied in barriers 14 and the base members 11, my invention; bracket members 18 that are adapted to be 40 Fig, 5 is a fragmentary sectional view secured to the base member 4 by screws 19. bo taken along the line V--V of Fig. 2; _ In this manner, it will be seen that the bar Fig. 6 is a fragmentary sectional view riers 14 and the base members 11, together taken along the line VI--VI of Fig, 5; with the conducting members 10 and con Fig. 7 is a front elevational view of the tact members 2 that are. supported thereby, 45 switch embodying my invention; are mounted as a unit on the base member bs Fig. 8 is a fragmentary front elevational 4 by means of the brackets 18 and screws 19. view showing an indicating device utilizing The movable contact members 3 are pro in connection with the switch, embodying vided with supporting members 20 to which my invention; and the contact members 3 are secured by rods 50 Fig. 9 is a diagrammatical representation 21, springs 22, and caps 23. The springs 22 ICO SC-SDC-0110 2 1,912,610 are disposed around the rods 21 and the energized, is adapted to set up sufficient roag- inner ends thereof are held in position by netie flux in the core member 39 and the cap-slmped members 24. The outer ends of armature member 47 to actuate the armature the springs 22 are held in position with re- member 47 into engagement with, the core 5 Sjpect to the rods 21 by the cap members 23. member 39. When the armature member ?o The cap members 23 are provided with 47 is thus actuated, the movable contact slotted openings 25 and depressions 26, and members 3 are actuated into engagement the rod 21 is provided with relatively _flat with the stationary contact members 2 projecting portions 27. The openings 25 in through the mechanical linkage comprising 10 the cap members 23 are of suitable size to the lever arm 38, the link members 35, the 75 permit the cap members 23 to be placed upon lever arm 33, the operating member 28, and the rods 21. When the cap members 23 are the supporting members 20 to which the so placed beyond the projecting portions 27, movable contact members 3 are resiliency the cap members may be turned through an secured by the springs 22. ' 15 angle of approximately 90 and released. The resilient connection between the con- 80 The depressed portions 26 of the cap mem- tact members 3 and the supporting members bers 23 will then be engaged by the project- 20 is so arranged that the contact members ing portions 27. of the rods 21. to secure 3 will engage the stationary contact mem- the same in position. Thus it will be seen bers 2 before the armature member 47 has SO that the contact members 3 may be readily been actuated through its complete path of 85 attached to the supporting members 20 with- travel. As soon as the contact members 3 out the use of tools or implements of any engage the contact members 2, the support- kind. It is only necessary to remove a ing members 20 are actuated away from the single terminal screw and to release a spring contact members 3 to compress the springs 25 cap to render any one of the contact mem- 22, thereby causing the contact members 3 to 90 bers 3 instantly detachable. engage the contact members 2 with a firm The supporting members 20 are adapted wiping and rocking action. In this man- to be seemed to an operating member 28 of ner, perfect electrical contact between the insulating material by screws 29. The oper- members 2 and ff'|s'5nsured, and the members 30 at ing member .28 is provided, at the end 2 and 3 are of such heavy material, that a 95 thereof, with pins 30 that are adapted to be cui'rent path of extremely low resistance is pivotally supported by bracket members 31. secured when the magnet coil 43 is de-en- Tlie bracket members 31 are secured to the ergized, the armature member 47 returns to base member 4 by screws 32 or other suitable its initial position by the action of gravity 35 means. The operating member 28, being of and the force of the compressed springs 22, IOC solid insulating material, cannot warp or and the movable contact members 3 are thus wear through and cause short circuits, and actuated out of engagement with the sfca- providcs a rugged and reliable mounting for tionary contact members 2. the movable contact members 3. An auxiliary base member 49, which is 40 A lever arm 33 that is secured to the oper- preferably of insulating material, is secured 105 ating member 28 by screws 34 is pivotally to the bass member 4 by screws 50 and is secured to one end of link .members.35, the provided with spacing portions 51 to main- opposite extremities of which are pivotally tain the main and auxiliary base members secured to a lever arm 36. The lever arm in spaced relation. Bracket members 52 are 45 30 is pivotally supported by a pin 37 which secured to the auxiliary base member 49 I10 also engages a fixed supporting member 38. and are adapted to support thermostatic The supporting member 38 is secured to an members 53 at one extremity of each of said electromagnetic core member 39 which is thermostatic members. The opposite ex- mounted on the base member 4 by screws 40 tremities of the thermostatic members 53 are S3 &nd is insulated therefrom by means ox a adjacent each other and are adapted to be 115 sheet 41 and a washer 42 of any suitable actuated in accordance with the temperature insulating material. of the thermostatic members. The thermo- A coil 43 is disposed around one leg. of static members are of heavy material and the core member 39 and is held in position large size, thus insuring positive deflection 55 by supporting members 44 that are secured and relatively quick return to normal posi- 120 by screws 45 to projecting wings 46 of the tion, since a large heat radiating surface is other leg of the core member 39. obtained by this construction. Besistor ele- An armature member 47 is fixedly secured ments 54 are supported, by bracket members to the lever arm 36 to provide a pivotal 55 of electrical conducting material that are 60 mounting for said armature member with re- suitably secured to the auxiliary base mem- 125 spect to the pin 37. A member 48 that is ber 49. The resistor elements 54, which are also secured to the wings 46 by the screw 45 preferably made in grid form of wire hav- provides a stop for the armature member 47 mg suitable electrical resistance, comprise to limit the movement thereof away from the lug members 56 suitably secured thereto 05 core member 39. The magnet coil 43, when and are adapted to carry any desired identifi- 130 1,913,610 3 cation marksj such as an indication of the member in the position to which it is thns current-carrying capacity of the element or actuated. Thus, it will be seen that the the like. mounting of the member 80 comprises a The resistor elements 54 are connected in toggle mechanism. When the member 80 is s series circuit relation with two of the moy- . manually actuated to the position shown in W able contact members 3 by means of the broken lines in Fig. 2, it is ineffective to bracket members 55, flexible conductor accomplish the purpose for which it is pro members 57, and a suitable insulated con- vided, but when it is returned to the posi- ductor 58. Since only two resistor elements tion shown in full lines, it is effective to 10 are required for use in connection with a latch the switch operating member 71 in 7a three-wire circuit, the remaining .movable the position to which this member is actu- contact member 3 of the switch 1 is connected ated when the electromagnetic coil 68 is en- through a flexible conductor member 59 and ergized, as hereinafter described, a bus bar 60 to a connection post 61 to which When the magnet coil 68 is energized, the 15 a conductor 62 extending through the casing armature member 70 is attracted toward the 80 5 is adapted to be connected. Other such core member 69 to actuate the contact mem- conductors 63 and 64 are connected to the ber 74 out of engagement with the contact bracket members 55 by means of.connection member 75. If the latching member 80 has posts 65 and 66. ' . not been manually actuated out of its oper- 20 A protective device 67 for controlling the ative position the spring 82 thereupon actu- .85 energization of the electromagnet 43 com- ates the member 80 into the position shown prises an auxiliary electromagnet 68 and a in Fig, 8 of the drawings, in which position core member 69 therefor secured to the auxil- this member engages tne downwardly ex- iary base member 49. An armature member tending portion. 79. of the switch operating 25 70 for the electromagnet 68 is secured to a member 71 to prevent said member from re 00 switch operating member 71 that is pivotally turning to the position shown in Fig. 2. In supported by bracket members 72, wliich, in this position the extending portion 84 of turn, are secured to the auxiliary base mem- the member 80 is in engagement with the ber 49, An upwardly ext&idhig portion 73 base member 4, thereby limiting the move- 80 of the switch .operating member 71 supports ment of the member 80. 95 a contact point 74 that is adapted to engage a As shown in Fig. 5 of the drawings, a contact member 75 that is resihently laterally extending portion 86 of the mem- mounted by means of a supporting membra- ber 80 is adapted to be engaged by a lever 70 and a bracket member 77 secured to the arm portion 87 of a rod 88 that is rotatably 35 auxiliary base member 49. The contact mounted by bracket members 89. The 100 member 74 is preferably of silver to insure bracket members 89 are secured to the base the making of perfect electrical contact at member 4 by screws or rivets 90. The outer all times. Electrical connections to the con- extremity of the rod 88 forms a crank arm tact member 74 is affected through a flexible 40 conductor 78, permitting the main portion 91 which projects through a dotted aperture 93. in an operating member 92. The operat 10.' ed the switch operating member 71 to be ing member 92 is pivotally mounted by a made of insulating material. _ pin 94 extending through the wall of the A downwardly extending portion 79 of casing 5. A slotted aperture 95 in the wall tlie member 71 is adapted to be engaged by of the casing 5 permits a handle member 96 48 a latching member 80 that is pivotally that is secured to the operating member 92 iia mounted on a bracket member 81 secured to to extend therethrough, the base member 4. A tension spring 82 A tension spring 97 is connected at one is connected at one end thereof to a hook end thereof to a hook member 98 that is se- member 83 secured to the base member 4, cured to the casing 5 and at the opposite end 50 and at its other end to the latching mem- thereof to a projecting portion 99 of the 115 ber 80. The latching member 80 comprises .operating member 92. The operating mem- a bockwardly extending portion 84 that is ber 92 and the handle member 96 are thus adapted to engage the base member 4 to maintained in their uppermost positions by limit the upward movement of the latching the spring 97, but are adapted, to be actu- 65 member 80 under the influence of the spring ated downwardly against the tension of the ISO 82. . spring 97 by manipulation of the handle The pivotally mounted latching member member 96. When the handle member 96 80 and the spring 82 are so constructed and is thus manipulated, the rod 88 is turned in arranged that the member 80 may be man- the bracket member 89, and the lever arm 63 ualiy actuated by means of an outwardly ex- portion 87 is actuated downwardly into en- 1M tenaing portion 85 into the position shown gagement with the projecting portion 86 of in broken lines in Fig. 2 of the drawings, the latching member 80. The latching mem- When the member 80 is so actuated, the ber 80 is thereby actuated downwardly spring 82 passes over the pivotal axis of against the tension of the spring 82 to cause 05 support of the member 80 to maintain said the member 80 to disengage the downwardly 130 ,4 1 912,810 extending portion 79 of the switch oper- ber 108, but the movement thereof away from. ating member 71 The member 71 is there- the member 108 is limited by the hook por- . upon, permitted to return to the position tion 118 -which, engages the member 108 be- shown in Fig. 2 by the action of gravity, and low the aperture 119, through which the said 8 the contact member 74 again engages the hook portion extends. The lower extremity 10 contact member 75. of the resilient member 117 also comprises For the purpose of controlling the ener- a -detent portion 120? that is adapted to co gitation of the electromagnet 68, a switch .operate with a latching member 121 that is 100 comprising an adjustable fixed contact secured to the switch operating member 71, io member 101 and a movable contact member as will be described presently. 75 102 is provided. The contact members 101 The bracket member 118 comprises a and 102 are preferably constructed with sil- downwardly bent portion 122 at tne outer ver tips. The contact member 101 is mount- end thereof and two bent portions 123, in ed upon a screw-threaded member 103 that turn, extend outwardly from the portion 122. IS is adapted to engage a correspondingly A resilient member 124 is provided with a SO screw-threaded opening in a bracket mem- vertically slotted aperture 125, through her 104. A lock-nut 105 is provided for the which the outwardly extending portions 123 purpose of securing the 'screw-threaded and a screw 126 are adapted to extend to member 103 in any desired position with re- permit the resilient member 124 to be moved 20 spect to the bracket member 104. The brack- vertically with respect to the bracket mem- 86 et member 104 is suitably secured to the ber 113. A thumb screw or knurled nut 127 auxiliary base member 49 and is of electrical is provided with screw-threads whereby it conducting material to constitute a portion may engage the outwardly extending screw- of the circuit extending through tne con- threaded portion of the screw 126 to secure 25 tact members 101 and 102. A conductor 106 the resilient member 124 in position with re- 00 oxtends from a connection post 107 that is spect to the bracket member 113. connected to the bracket member 104 to cer- A calibrating member 128 is also provided tain apparatus located outside the casing 5, with a vertical slotted aperture 129 whereby which is hereinafter described. The conduc- this member may be secured In fixed ver,30 toi* 78, which, as previously described, is con- tical position with respect to the bracket 95 nected to the movable contact member 74 member 113 by means of the thumb screw through the upwardly extending member 73 127. A series of substantially semi-cylin- associated with the switch operating mem- drical indentations 130 along one of the ver- ber 71, is also connected to the connection tical edges of the calibrating member 128 35 post 107. are adapted to be engaged by a pin 131, ioo The movable contact member 102 is sup- whereby the vertical position of the cali- ported by the lower extremity of a channel- brating member 128 with respect to the shaped member 108, the upper end of which bracket member 113 may be adjusted as de is secured by rivets 109 to a resilient mem- sired. 40 ber 110. The resilient member 110 is simi- An index marking 132 on the calibrating 105 - larly connectedly rivets 111 to an upwardly member 128 serves in conjunction with a extending portion 112 of a bracket member scale member 133 that is secured to the re- 113 that is secured to the auxiliary base. ` silient member 124 and has graduated mark- member 49 by a screw 114. The bracket ings thereon, to indicate the' position of the 45 member 113 is of electrical conducting ma- resilient member 124 with respect to the no terial and is provided with a screw 115 by calibrating member 128. A handle member means of which a conductor 116 is electrical- 134 of insulating material is secured to the ly connected through the bracket member upper portion of the resilient member 124 113, the resilient member 110 and the chan- to facilitate adjustment thereof. It will be 60 nel member 108 to the movable contact mem- seen that the member 124 may be adjusted 115 ber 102. The conductor 116 extends from vertically with respect to the bracket mem- the screw 115 to one terminal of the magnet ber 113, simply by loosening the thumb coil 68, as will more clearly appear by refer- screw 127 and manipulating the handle ring to the circuit diagram of Fig. 9, which member 134 as desired. Since the calibrat es is hereinafter described in detail. ing member 128 is engaged at the indenta- 120 A resilient member 117 is also secured by tions 130 by the pin 131, the position of this the rivets 109 to . the channel member 108 member may not be adjusted without re- and the resilient supporting member 110. moving the thumb screw 127 from the screw The member 117 extends downwardly ad- 126 to permit the member 128 to be moved 80 Jacent the member 108, but in slightly spaced outwardly out of engagement with the pin 125 relation thereto. At the lower extremity of 131. By this means accidental displacement the member 117 a hook portion 118 is pro- of the calibrating member 128 when the vided and extends through an aperture 119 member 124 is being adjusted is prevented, in the member 108. Tbe member 117 is bi- A portion 135 of the resilient member 124 00 ased by its resiliency away from the mem- near the lower extremity thereof is bent in- 130 1,918,010 . 5 , wardly toward the channel member 108 arid movable contact member 74 instantaneously extends between the channel member 108 and to disengage the resiliently mounted con the extremities of the thermostatic members tact mcmber 75. When these contact mem 53. The extreme lower portion of the mem- bers are disengaged, the energizing circuit 8 ber 124 is again bent outwardly from an arcu of the electromagnet 43 is interrupted, as ate portion 136 that is adapted to engage the will also be described hereinafter with -refer channel member 108. ence to Fig. 9. De-energization of the mag The thermostatic members 53 are support net coil 43 permits the switch 1 to be opened, ed in relatively close proximity to the re- thereby interrupting the circuit extending 10 sistor elements 54, as previously described; through the resistor elements 54. 16 and as shown in the drawings. Therefore, When the armature member 70 is actuated the temperature of the thermostatic mem in response to energization of the magnet bers 53 is directi/ controlled by the temper coil 68, the outer extremity of the latching ature of the resistor elements 54, which, in member' 121 that is associated with the 1* turn, is dependent upon the value of the cur switch operating member 71 is actuated up- 80 rent traversing the circuit in which these ele wardly and past the detent portion 120 .of ments are connected. As the temperature of the resilient member 117. The resiliency of the thermostatic members 53 increases by the member 117 permits the latching mem reason of an increase in the value of the cur- ber 121 to move upwardly past the detent 80 rent traversing the circuit in which the re portion 120, but when the latching member 85 sistor elements 54 are connected, these mem 121 has been so actuated the detent portion bers are deflected in Such manner that the 120 is again biased to the position in which ' adjacent movable extremities thereof are ac the hook portion 118- thereof engages the tuated toward the inclined portion 135 of the channel member 108, as shown in Fig. 2 of 8* resilient member 124. Lugs 137 of substan the. drawings. The various members re- 90 tially hemi-spherical surface are secured to ferred to then -occupy the positions illus the adjacent inner extremities of the thermo trated in Fig. 3, in which it will be seen static members 53 and are adapted to en that the switch operating member 71 can gage the inclined portion 135 of the resilient not return to the position in which the con 30 member 124. It is preferable .to provide tact members 74 and 75 are engaged until members 138 of suitable heat residing and both of the thermostatic members 53 have electrical insulating material,' such as' as moved back a sufficient distance to permit bestos composition, between the lugs 137 and the detent portion 120 to disengage the latch- the main portions of the thermostatic mem- ing member 221. Before the thermostatic 30 bers 58 to prevent the lugs 137 from attain members 53 can move back such a distance, 100 ing an excessive temperature and transmit it is necessary that the temperature of these ting such temperature to the resilient mem members be reduced to a predetermined ber 124. By making the members 138 of value, and it is for this purpose that the de electrical insulating material, proper elec- tent portion 120 and the latching member 40 trical spacing is obtained and the occurrence 121 are provided. By reason of tne opera- 105 of short circuits by reason of accidental con t-ion of these members, the magnet coil 68 tact between the thermostatic members 53 may be de-energized immediately after the arid the resistor elements 54 is prevented. armature member 70 has been actuated into As the movable extremities of the ther engagement with the core member 69 and eto mostatic members 53, or either of them, are the disengagement of the contact members 110 actuated inwardly in response to an increase 101 and 102 will not affect engagement of in the temperature of the thermostatic mem the contact members 75 and 74. This con bers, the lower portion of the resilient mem struction insures quick and positive inter ber 124 is engaged by the lugs 137' and is ruption and completion of the circuit of the so likewise actuated inwardly to actuate the main switch operating magnet 43 under all 115 channel member 108 against the biasing ac conditions, and thereby precludes chatter tion of the resilient member 110. The mov ing and burning of the contact members of able contact member 102 is thus actuated both the main and auxiliary switches. toward the fixed contact member 101, and, if In order to provide emergency means for 05 the temperature of either of the thermostatic interrupting the circuits of the magnet coil 120 members 53 attains a predetermined value, 43 to open the switch 1 and to preclude re the contact member 102 will be actuated a closing thereof without opening the casing sufficient distance to engage the contact mem* 5, a manually operable switch 139 is pro ber 101. When such engagement occurs a vided, as shown in Figs. 1 and 7 of the draw o circuit is completed for energizing the mag ings, and is connected in series circuit rela- 125 net coil 68, as will be fully described here tion with the magnet coil 43. The switch inafter with reference to .the circuit diagram, 139 is of the knife-blade type and is pro of Fig. 9. When the magnet coil is thus vided with a handle member 139 of insulat energized, the armature member 70 is at- ing material to which a cord 140 or other - 05 tracted to the core member 69 to cause the suitable tensible means are connected. A 130 6 1,813,610 hooked rod 141 is connected to the lower ex trol conductor 158 is connected by a screw tremity of the cord 140 and extends through 159 to the conducting member 10 to which an opening 142 in the casing 5. The lower the power conductor 1$5 is connected and extremity of the rod 141 outside the casing extends to one terminal of the electromagnet- 5 5 is provided with a ring 143 whereby the 43. The other terminal of.the electromagnet TO switch 139 may be manually opened from 43 is connected through a control conductor without the casing 5. By reason of the na 160 to one terminal of the manually oper ture of the connection between the rod 141 able switch 139, the other terminal of which and the switch handle 139*, it will be seen is connected through a control conductor 10 that the switch 139 cannot be re-closed with 161, the bracket member 77, and the resilient TO out opening the casing 5. member 76 to the contact member 75, which A closure member 144 is mounted on the was previously described. casing 5 by means of hinges 145 whereby the . An auxiliary switch 162, shown in detail apparatus within the casing may be com- in Fig. 4, comprises a resilient conducting 15 pletely enclosed. Suitable latching means member 163, the lower end of which is sc- 80 146 are provided for securing the closure cured to and supported by the auxiliary base member 144 in closed relation to the casing member 49 in electrical conducting relation 5 and a member 147 having an opening 148 to one end of a conductor 164, to which ref therein is also secured to the .casing 5 and erence is made hereinafter. The member 163 20 is adapted to co-operate with a correspond extends upwardly and somewhat forwardly 85 ing member secured to the closure member from its point of support on the base mem 144 in such manner that locking means may. ber 49, and is provided near its upper ex be inserted through the openings in said tremity with a contact member 165 to co members to preclude opening of the closure operate with a similar contact member 166. 85 member 144 without the use of a suitable The latter contact member is secured to a 8 key or the like. ' resilient conducting member 167 near the In order that the operative condition of lower extremity thereof. The upper extrem the switch 1 may he ascertained from with ity of the member 167 is secured to and sup out the casing 5 while the closure member ported by the left-hand one of the conduct so 144 is in closed relation thereto, an indicat ing members 10 in electrical conducting rela- 95 ing member 149 is secured to an outwardly tion thereto and extends downwardly and extending portion 150 of the lever arm 33. somewhat rearwardly therefrom to support An aperture 151 is provided in the closure the contact member 166 in relatively close member 144, through which the indicating proximity to the contact member 165. 3 member 149 may be viewed, and this aper An auxiliary actuating member 168 of in- loo ture is covered by a member 152 of suitable sulating material is secured to the operat transparent material that is preferably se ing member 28 and extends upwardly and cured to the inner surface of the closure rearwardly therefrom to engage the resilient, member 144 as shown in Fig. 2 of the draw- member 163 when the operating member 28 40 ings. The fragmentary view shown in Fig. is turned to close the main switch 1. When 1W 8 illustrates the manner in which the posi such operation takes place, the resilient mem tion of the switch 1 is indicated by the mem ber 163 is actuated rearwardly by the aux ber 149 while the closure member 144 is in iliary actuating member 168 to cause the closed relation to the casing 5. contact member 165 to engage the contact 45 Fig. T shows the arrangement of certain member 166.. The positions of the contaci HO of the power and control conductors that members and operating members after such are associated with the apparatus mounted operation has taken place are indicated in within the casing 5. As previously de broken lines in Fig. 4. scribed, the power conductors 62, 63, and 64 It will be seen that when the contact mem 50 are connected to the circuit or apparatus to bers 165 and 166 are engaged, as above de- ns be controlled by the switch embodying my scribed, the conductor ,164 is electrically con invention. Electrical energy is supplied to nected to the supply conductor 153 through such circuit or apparatus through the switch resilient member 163, contact members 165 and the conductors 62, 63, and 64 from any and 166, resilient member 167 and conduct 56 suitable source to which supply conductors ing member 10. The conductor 164, as 120 153,154, and 155 are. connected. The latter shown in broken lines in Fig. 7, extends conductors are connected, respectively, to the downwardly on the rear surface of the aux conducting members 10 to which the station iliary base member 49 to be connected to a ary contact members 2 of the switch 1 are connection post 171, whence connection is 50 secured. A control conductor 156 is con made to the control station outside the cas- 125 nected by a screw 157 to the conducting ing 5 by means of a control conductor 172. member 10 to which the power conductor One terminal of the electromagnet 68 is 153 is connected and extends to a control connected by the conductor 116 and screw station outside the casing 5, which will be 115 to the conducting bracket member 113, 65 described with reference to Fig. 9. A con as described with reference to Fig. 2. The 130 1,813,610 7 other terminal of the electromagnet 68 is opening of the switch 1, but in the event connected by a. conductor 116a to a connec of an emergency the manually operable tion post 1165, to which the conductor, 58 switch 139 may be opened by manipulating and the right-hand one of the conductors-57 the ring 243, as previously described. When 5 are connected. The connection post 1165 the switch 139 is thus opened, it is necessary TO is, therefore, electrically connected to the for the casing 5 to be opened before the ap supply conductor 155 when the switch 1 is paratus can do restored to operative condi closed. tion. An emergency requiring the opera deferring now to the diagram shown in tion of the switch 139 might be caused by 10 Fig, 9, it will be seen that the control con reason of a short circuit between the con- 75 ductors 106,156, and 172 extend to a control troi conductor 106 and either of the control station comprising a normally open starting . conductors 156 and 172. In the event of switch 173 and a normally closed-stopping such b short circuit, the opening of the switch 174. For the purpose of describing stopping switch 174 would be ineffective to 15 the operation of the device embodying my interrupt the energizing circuit of the elec- 80 invention, it will be assumed that the main tromagnet 43.. The switch 139, may also switch 1 is open, that the supply conductors be opened when it is desired to protect per 153,154 and 155 are properly energized and sons working on the circuit to which the con that it is desired to energize the circuit or ductors 62, 63 and 64 are connected in 20 apparatus to.which the power conductors 62, which case the closure member .144 of the 8.5 63 and -64 are connected. When these con casing 5 would preferably be locked in closed ditions obtain, the starting switch 173 will position to preclude premature reclosing of be closed by an operator to effect energiza the switch 139. tion of the electromagnet 43 through a cir- The switch 1 may also be opened in re 25 cuit extending from the supply conductor sponse to the operation of the protective de- 9 153 through the control conductor 156, the vice 67, which is effective to cause disengage starting switch 173, the control conductors ment of the contact members 74 and 75 when 106 ana 78, the contact members 74. and 7,' the temperature of the thermostatic mem the resilient member 76, the'control conduc- bers 53 becomes excessive by reason of an 30 tor 161. the manually operable switch 139, excessive current traversal of the power con- 9 the control conductor 160, the operating coil ductors with which the resistor elements 54 of the electromagnet 43, and the control con are associated. In the event of such ex ductor 158 to the supply conductor 155. cessive current traversal of the power con The main switch 1 is closed in response to ductors and the resistor elements 54, which 35 the energization of the electromagnet 43 might be caused either by a fault in the cir- 19 this circuit, and the auxiliary switch 162 is cuit or apparatus to which the power con simultaneously closed^ to complet a holding ductors are connected or by a failure of one circuit for the operating coil of the electro phase of the supply circuit, either or both magnet 43. This holding circuit is connect- of the thermostatic members 53 will be de 40 ed m parallel relation to the starting switch flected inwardly to cause the corresponding 105 173 and extends from the supply conductor lug dr lugs 137 to engage the inclined sur 153 through the auxiliary switch 162, the face portion 135 of the resilient member 124. control conductors 164 and 172, and the nor The channel member 108 is thereupon en mally closed stopping switch 174. Thus, it gaged by the arcuate portion 136 of the 45 will be seen that energization of the electro member 124 to cause the contact member 102 HO magnet 43 is maintained to maintain the to be actuated into engagement with the con switch 1 in closed position as long as the sup tact-member 101 against the biasing action ply conductors 153, 154, and 155 are nor of the resilient member 110. mally energised, the manually operable When the contact members 101 and 102 50 switch 139 and the stopping switch^ 174 are are thus engaged, a circuit is completed from 113 permitted to remain in closed position, and the supply conductor 153 through the aux the contact members 74 and 75 remain in iliary switch 162, the control conductors 164 engagement. An abnormal reduction of the and 172, the stopping switch 174, the con voltage between, the supply conductors 153 tact members 101 and 102, the channel mem 85 and i55 will automatically result in open ber 108, the resilient member 110, the bracket *20 ing of the switch 1, since the operating coil member 113, the screw 115, the control con of tills switch is energized from these con ductor 116, the operating coil of the elec ductors. Inherent low voltage protection is tromagnet 68, the control conductor- 116a, thus obtained at all times. , and the switch 1 to the supply conductor 60 The switch 1 may be opened at any time 155. The. electromagnet 68 is thus ener- 125 by opening the stopping switch 174 momen gized from the supply conductors 153 and tarily to.interrupt the holding circuit for the 155 to cause the armature member 70 to be operating coil ox the electromagnet 43, or by actuated into engagement with the core opening the manually operable switch 139. member 69. The contact member 74 is there 83 stopping switch 174 is utilized to effect by actuated put of engagement with the con- 130 s tact member 75, to interrupt the energizing position by loosening the thumb-screw 127 circuit of the electromagnet 43, and the main and manipulating the handle member 134 to switch 1 and the auxiliary switch 102 arc, bring a higher percentage marking on the permitted to open, the latter switch opening scale member 133 into alignment with the 5 by reason of the resiliency of the member index marking 132, the thermostatic mem- 70 103 when said member is disengaged by the bers 53 must be deflected inwardly a greater actuating member 168 in response to the distance before the lugs 137 will engage the opening of the main switch 1. inclined surface of the member 124, and, When the armature member TO is actuated therefore, a greater current traversal of the to i]i the manner described, the latching mem resistor elements 54 is required to effect op- 75 ber 121 is actuated upwardly past the de eration of the protective device 67. The op tent member 120, which is then biased back posite is true, of course, when the member under the latching member 121 to maintain 124 is moved downwardly. _ the armature member 70 in closed relation The calibrating member 128, which car is to the core member 69, although the electro ries the index marking 132, is adjusted when 8() magnet 68 has been deenergized by reason the device is assembled or put into service of the opening of the main switch 1. Re by so adjusting toe position of the member engagement of the contact members 74 and 124 that the protective device 67 will func 75 is thus prevented until the thermostatic tion when the resistor elements 54 are tra 20 members 53 have cooled sufficiently to per- versed by currents corresponding to their g5 ` mit the channel member 108, under the bias rated capacities. When thus position is de ing influence of the resilient member 110, termined, the member' 124 is held in such to actuate the detent member 120 out of en position while the thumb-screw 127 is re gagement with the latching member 121. moved to permit the calibrating member 128 25 In the event of operation of the protective to be placed in- position with the projecting w device 67 in the manner described, it is> nec portions 123 of the bracket member 113 ex essary that the starting switch 173 be closed tending through the aperture 129 in the cali by an operator before the main switch 1 can. brating member, and with the pin 131 en be reclosed. If the latching member 80 is gaging the proper indentation 130 to cause 20 in its operative position it is also necessary the index marking 132 to be brought into #5 that the handle member 96 extending alignment with the 100 per cent, marking on through the wall of the casing 5 be de the scale member 133. The thumb-screw 127 pressed to. permit the contact members_74 is then replaced and the position of toe cali and 75 to be re-engaged. If the latching brating member 128 cannot thereafter be . 35 member 80 has been manually actuated out changed without removing the said thumb- Jao of operative position, however, the switch screw again. The position of the member 1 may be reclosed simply by closing the starting switch 173 as soon as the thermo 124 may be adjusted as desired, however, by simply loosening the thumb-screw 127 slight static members 53 have cooled sufficiently to ly and manipulating the handle member 134. to permit the channel member 108 to actuate The setting of the device is always accurate- 105 the detent member 120 out of engagement ly indicated by the index marking 132 co with the latching member 121, thereby per operating with the scale member 133, be mitting the contact members 74 and 75 to be cause the device is accurately calibrated engaged. when put into service, as described. ts The degree of overload which -will effect From the foregoing description it will be no operation of the protective device 67 may be predetermined by selecting the desired seen that I have provided a simple and ef fective remotely controlled switch for con rating of interchangeable resistor elements trolling the energization of an electric cir 54, as may be indicated on the members 56 cuit. . tinder normal conditions toe electric 55 that are associated therewith, as previously circuit is energized and de-energized in re- J16 described, and also by adjusting the vertical spouse to the operation of starting and stop position of the resilient member 124 as de ping switches, respectively. Readily adjust sired. The scale member 133 that is associ able protective means are operative at all ated with the member 124 is preferably grad- times when the main switch is closed to ef 55 uated In percentages of the rating of the re fect opening thereof in response to abnor- joo sistor elements 54. mal circuit conditions, and latching means " Thus, when the member 124 is so adjusted are provided for precluding reclosing of the that the index marking 132 on the calibrat main switch in response to actuation of the ing member 128 is in alignment with the 100 starting switch until the latching means have so percent, marking on the scale member 133, been manually reset. If desired, these latch- 12S the protective device 67 will function in the ing means may be rendered inoperative to manner described when either or both of the accomplish this result. Emergency means resistor elements 54 are traversed by current are also provided for opening the main of the rated capacity of such elements. switch and for precluding reclosure thereof 65 When the member 124 is raised above this without opening the casing within which. JJ0 1,813,910 9 the switch and the protective means are en means for precluding operation of said closed. latching means. _ - While I have shown and described only 6. A device for controlling an electric cir one specific embodiment of my invention, it cuit comprising a main switch, closing means 8 will Be understood that various changes and therefor, means for controlling the operation 79 modifications may be made in the devices of said closing means in accordance with and circuits utilized in connection therewith predetermined conditions of. the circuit to without departing from the spirit and scope be controlled by the main switch, means for of my invention. Therefore, I desire that limiting the operation of said controlling 10 my invention be limited only by the scope means and means for preventing operation 75 or the appended claims and the prior art. of said limiting means. I claim as my invention: 7. A device for controlling an electric cir 1. A device for controlling an electric cir cuit comprising a main switch, electromag cuit comprising a switch, holding means for netic closing means therefor, an auxiliary is maintaining the switch in closed position, switch for controlling the energization of 88 means actuable in accordance with a condi said electromagnetic means, means for open tion of the circuit to be controlled for ren ing said auxiliary switch in response to pre dering the holding means ineffective, means determined conditions in the circuit to be for controlling said actuable means to main- controlled by the main switch, means requir 20 tain the holding means ineffective subject to ing the exercise of an external influence be- 88 a condition of the circuit to be controlled, fore said auxiliary switch can be reclosed and means capable of being rendered effec and means whereby operation of said last- tive at will to prevent the holding means mentioned means may be prevented. . from being rendered again effective subject 8. A device for controlling an electric cir- . 2* to the exercise of an external influence. cuit comprising a main switch, electromag- 80 2. A device for controlling an electric cir nefcic closing means therefor, an auxiliary cuit comprising a main switch normally switch in circuit with said electromagnetic biased to open position, electromagnetic means, electromagnetic means for opening means for actuating said main switch to and said auxiliary switch, a member adapted to 30 maintaining it in closed position, an auxil be actuated in accordance with the predeter- 88 iary switch in circuit with the electromag mined condition of the circuit to be con netic means, means for opening the auxiliary trolled by the main switch, a second auxil switch in accordance with a condition of the iary switch actuated by said member and circuit to be controlled by the main switch, connected in circuit with the electromagnetic 35 means for precluding reefosing of the auxil means for the first-mentioned auxiliary *88 iary switch subject to the exercise of an ex switch and latching means actuated by said ternal influence, and means whereby opera member for maintaining said first-mentioned tion of said precluding means may be pre auxiliary switch in open position. vented. 9. A device for controlling an electric cir 40 3. A device for controlling an electric cir cuit comprising a main switch, electromag- 108 cuit comprising a main switch normally netic operating means therefor, an auxiliaiy biased to open position, electromagnetic switch in circuit with said electromagnetic means for actuating said main switch to and means, electromagnetic means for opening maintaining it in closed position, an auxil- said auxiliary switch, means for energizing 48 iary switch in circuit with the eleetromag-' the electromagnetic means for the auxiliary"118 netie means, means responsive to a collection switch in accordance with a predetermined" of the circuit to be controlled by the main condition of the circuit to be controlled by switch for opening the auxiliary switch, the main switch and mechanical latching latching means for maintaining the auxil- means also adapted to be actuated in accord^ 50 iary switch in open position ana means for ance with said predetermined condition of 118 precluding the operation of said latching means. * 4 A device for controlling an electric 55 circuit comprising a main switch,- closing 'means therefor, means for rendering said closing means ineffective, means for prevent the circuit to be controlled by the main switch for maintaining the auxiliary switch in open position. .. 10. A device for controlling an electric cir cuit comprising a main switch, electromag- 128 netic operating means therefor, an auxiliary switch in circuit with said electromagnetic ing said closing means from being rendered means, means for opening said auxiliary again effective, and means for precluding the switch, latching means for maintaining said - go operation of said preventing means. auxiliary switoh in open position, manually 125 5. A device for controlling an electric cir operable releasing means for said latching " cuit comprising a main switch, closing means means, and means for rendering said latching therefor, means for rendering said closing means ineffective to maintain said auxiliary means ineffectivet latching means for main- switch in open position. 65 taining said closing means ineffective, and 11. A device for controlling an electric 138 d to 1,913,610 circuit comprising a main switch, electro actuabte member for effecting energization magnetic actuating means therefor^ an aux of said electromagnetic, means in response to iliary switch in circuit with said electro a predetermined thermal condition of said magnetic means, a casing enclosing said electric circuit and for releasing said me l main switch, electromagnetic means and chanical latching means in response to an- 70 auxiliary switch, said casing comprising an other thermal condition of said electric cir opcnable closure member, a handle member cuit. _ associated-witti the auxiliary switch where 17. In combinaiion, an electric, circuit, a by said switch may be manually closed main switch for controlling said circuit, an 10 while the closure member is in open relation auxiliary switch for controlling the opera- 7s to the casing, a manually operable member tion of said main switch, electromagnetic extending through said easing, and tensibio means for opening said auxiliary switch, me- means connecting said handle member and chnnienl latching means for precluding re said manually operable member whereby closure of said auxiliary switch and thernto- 35 said auxiliary switch may be opened but not responsive means associated with said dec- 80 closed by manipulating said manually oper trie circuit for controlling the operation of able member from without the casing while said electromagnetic means and said me said closure member is in closed relation to chanical latching means. the casing. 18. Iut combination, an electric circuit, u 20 12. A protective device for an electromag- main switch for controlling said circuit, an 85 netically operated switch comprising a auxiliary switch for controlling the opera member aetnable in response to a condition tion of said main switch, electromagnetic of the circuit to be controlled by said switch, means for opening said auxiliary switch, electromagnetic means energized in response mechanical latching means for precluding 25 to the actuation of said member to interrupt redosure of said auxiliary switch and thcr- 8 the energizing circuit for the operating elec mo-responsive means associated with said tromagnet of said switch ana mechanical electric circuit for effecting energization of means actuated by said member to preclude said electromagnetic means and for render re-energization of said operating electro- ing said mechanical latching means ineffec 30 magnet. tive. 05 13. A protective device for an electromag 19. A device for controlling an electric cir netic-ally operated main switch comprising cuit comprising a switch, holding means for an auxiliary switch in circuit with the op maintaining the switch in closed position, erating electromagnet of the main switch, means aetnable in accordance with a condi 35 electromagnetic means for opening said aux tion of the circuit to be controlled for ren- 108 iliary switch, mechanical means for holding dering the holding means ineffective, means said auxiliary switch in open position and. for controlling said aetnable means requir means responsive to a condition of the cir ing the exercise of an external influence be cuit to be controlled by the main switch for fore the holding means can be rendoicd 40 controlling said electromagnetic means and again effective and further means for con- 105 said mechanical means. trolling said aetnable means in accordance 14. In combination, an electric circuit, a with a condition of the circuit to be con main switch for controlling said circuit, an trolled, said first-mentioned controlling auxiliary switch for controlling the opera- means being capable of ready disablement 43 tion of the main switch, electromagnetic whereby sard aetnable moans mnv again hiO means for opening said auxiliary switch, render said holding means effective solely mechanical means for precluding reclosure in accordance with said last-mentioned con of said auxiliary switch and means respon dition of the circuit to bo controlled. sive to a condition of said circuit for con- 20. A device_ for controlling an electric 58 trolling said electromagnetic means and said circuit comprising a main switch normally 15s mechanical means. biased to open position, electromagnetic 15. An electrical protective device com means for actuating said main switch to and prising a switch, electromagnetic means for maintaining it in closed position, an auxil opening said switch, mechanical means for iary switch in. circuit with the electromag 55 precluding reclosure of said switch and a netic means, means for opening the auxiliary 120 single means for controlling both said elec switch in accordance with a condition of the. tromagnetic means and said mechanical circuit to be controlled by the main switch, means. means for precluding rodosing of the aux 16. In combination, an electric circuit, & iliary switch subject to the exercise of an 30 main switch for controlling said circuit, an external influence, and a mounting for said 325 auxiliary switch for controlling the opera precluding means including parts that may tion of said main switch, electromagnetic be readily manipulated to render said pre means for opening said auxiliary switch, cluding means ineffective. _ mechanical latching means for precluding 21. A device for controlling an electric 35 reclosure of said auxiliary switch and an circuit comprising a main switch normally 330 . 1,918,610 11 biased to open position, electromagnetic magnetic means, means for opening said means for actuating said main switch to and auxiliary switch, interengaging latching maintaining it in dosed position, an auxil- members for maintaining said auxiliary iary switch in circuit with the electromag- switch in open position, manually operable 8 netic means, means responsive to a condi- releasing means for one of said latching 70 tion of the circuit to be controlled by the members, and means for supporting said one main switch for opening the auxiliary switch of said latching members so arranged that and for controlling the reclosing thereof, in- said member may be readily manipulated to terenmging latching members for maintain- remove the same from effective position. 10 ing the auxiliary switch in open position 27. A device for controlling an electric 75 and means for supporting one of said latch- circuit comprising a main switch, eleetro- ing members so arranged that said member magnetic operating means therefor, an aux- may be readily removed from effective po- iliary switch in circuit with said electro- sition to render the reclosing of said aux- magnetic means, and means actuable in ac15 iliary switch subject to the control of said cordance with a predetermined condition of so means responsive to a condition of the cir- the circuit to be controlled by the main cuit to be controlled by the main switch. _ switch for opening' said auxiliary switch, a 22. A device for controlling an electric portion of said actuable means serving, when circuit comprising a main switch, closing said auxiliary switch is opened, to prevent 20 means therefor, means for rendering said reclosing of said auxiliary switch until a 85 closing means ineffective, means automati- predetermined change has occurred in said caliy operative upon said closing means be- predetermined condition of the circuit to >ng rendered ineffective for preventing said be controlled by the main switch, closing means from being rendered again 28. A device for controlling an electric 25 effective, and means for supporting said circuit comprising, a main switch, electro-' 90 preventing means in such manner that the magnetic operating means therefor, an aux- latter may be readily manipulated to re- iliary switch in circuit with said electro move the same from operative position. _ magnetic means, and means actuable in ac- 23. A -device for controlling an electric cordance with the thermal condition of the 30 circuit comprising a main switch, closing circuit to be controlled by the main switch 95 means therefor, means for rendering said for opening said auxiliary switch, a portion closing means ineffective, _ interengaging of said actuable means serving, when said latching members for maintaining said clos- auxiliary switch is opened, to prevent re- ing means ineffective, and. means for sup- closing of said auxiliary switch until a pre35 jiorting one of said latching members so determined change has occurred in the ther- 100 arranged that said member may be readily mal condition of the circuit to be controlled removed from effective position. _ by the main switch. 24. A device for .controlling an electric In witness whereof, I have hereunto snb- . circuit comprising a main switch, closing scribed my name. 40 means therefor, means for controlling the JULES A. WIDMEB. 105 operation of said closing means in accord ance with predetermined conditions of the circuit to be controlled by the main switch, and means for limiting the operation of said 45 controlling means, said limiting means be no ing readily manipulable to remove the same from effective position and thereby to pre sent the same from functioning in any way. 25. A device for controlling an electric eo circuit comprising a main switch, electro- . us magnetic closing means therefor, an auxili ary switch for controlling the energization of said electromagnetic means, means for opening said auxiliary switch in response to 85 predetermined conditions in the circuit to 120 be controlled by the main switch, and means requiring the exercise of an external influ ence before said auxiliary switch can be re closed, said last-mentioned means being eo readily manipulable to remove tbe same 125 from effective position. 26. A device for controlling an electric circuit comprising a main switch, electro magnet operating means therefor, an aux- 85 iliary switch in circuit with said electro- 139 12 CERTIFICATE OF CORRECTION. Patent No. 1,912,610. June 6, 1933. JULES A. W1DMER. It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 47, for "utilizing" read "utilized"; page 7, after line 64, insert the words "In the normal operation.of the device the"; page 9, line 23, claim 1, before "at" insert "or ineffective"; and line 46, claim 3, for collection" read "condition"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office. Signed and sealed this 29th day of August, A. D. 1933. (Seal) M. I Moor*. Acting Commissioner of Patents. June 6, 1933 J, A. WIDMER BLS0T8ICAL D3VICS Filed Nov. 7, 1927 ZEi,g.X- 1,912,610 3 Sheets-Sheet 1 JQf ft