US913999A - Multiple-switch starter. - Google Patents

Description

' the starting resistance.

UNITED STATES PATENT OFFICE.

MULTIPLE-SWITCH STARTER.

To all w71 om it ma y concern.'

Be it known that l, HENRY J. WIEGAND, n i citizen of the United States, residinv ot Milwaukee. in the county of Milwau tee und Stute of lVisc-onsin, have invented new and useful Improvements in Multiple Switch Stortcls, of which the following is n full, clear. concise, und exact description, reference being hud to the accompanying drawi ing, forming a pil-rt of this specification.

.'ily invent-ion relates to improvements in l motor controllers. I'

It is particularly applicable to controllers g in which a plurality of hand operated j; switches are used for controlling n resistance.

Unc of thc objects of my invention is to Ii provide ny menus whereby the motor circuit l' will be opened unless a-ll of the switches are closed, and all of the resistance is removed from circuit.

According to the preferred form of my invention, l provide n plurality of hand opernted switches preferably adopted to .be closed in n definite sequence for controlling These switches are retained in their closed position by a. low voltage device, and one.of the switches is adopted to control the motor circuit. In order that the operator may not leave part of thc storting resistance in circuit. I provide n. switch for controlling the operating circuit of said low voltage device, which has a tondency to move to a. position to render said low voltage device inoperative, and which, duringr t e closing operation of the switches must be held by the operator in n position to render said low volta-ge device operativo. For retaining t-his switch in n. position to maintain the low voltage device operative after all of the switches are closed, I provide o latch which is operated upon the closix 0 of the last switch to mechanically hold thelow voltage device switch in a position to render said low voltage device o erative.

While I illustrate andp describe the preferred embodiment of my invention, which I have worked out for practical application, it

` be understood that m invention is Specification o! Letters Patent. Application Bled Hay 20, 1907, Serial No. 374.728.

susceptible to various mo ications and changes. i

For the purpose of disclosing my invention, I have illustrated in the accom an drawings, one form which my invention may 'thereof to directly connect take.

lotented March 2, 1909. Renewed January 11, 1909. Serial No. 471.775.

In said drawings: Figure 1 is n l'ront. eleva.- tion of the starting device of m invention, Fig. 2 is a sido elevation thercol, Fig. 3 is n detailed view of tho hitch mechanism for holding the switch in a. closed position, Fig. 4 is a. sectional t-op view of one of the switches, and a. top view ot' the cooperating rocking do Fig. 5 is a detailed vicw ol' one of tho roc ting dogs, and Fig. 6 is o diagramnmtic view of the circuit connections.

in the embodiment of my invention illustinted, l provide n plurality ot' switch levers or arms 1, l, 1b, und 1, which nre suilnhly pivoted or Jouriudcd at onccnd, and provided i at the opposite cud with suitable o icrntinf handles. l have shown the severo swit-ci levers as journolcd u nn n shiu't or rod :2, which is mourned in bearings 3, formed on brackets 4. The brackets 4 also support o rod which is threaded through n rubber tube 6 that serves ns n cushion or butler against which the extended ends o1l the switch or levers nrc adopted toimpinge when thrown open. Euch ot the levers carries n cont-uct device adopted to engage contact surfaces to complete the circuit therethrough. Upon the base board S, upon which are mounted, the various operating ports of the device nd which may bo formed of shite. soopstone or like material. is mounted a contact bnr 9 with which one end of the o0ntact device 7 of euch arm or lever is odapted to engage, thcI other end ot' Suid device being adapted to engage one of the contact terminals 10, 10, l()b and 10, also mounted upon the hase 8. The terminal 10 is provided with n binding post. 1l, hy which suitable electrical connections may be mode ond the terminal 10 is provided with a hindi post- 12. Upon the terminal 10 is mountg carbon block 13 and n similnr block 14 is mounted upon the end of the Contact bar 9. The switch arm 1 carries laterally extending SE1-ing arms 15 and 16, which support upon te ends thereof, carbon blocks 17 zuid 1S rennd which nre adopted when the switch arm l is moved, to close the circuit. to engage the blocks 13 and 14, whereby the circuit is closed from the terminal 10 to the termina-l 9. The further movement of the switch arm 1 causes the contact device 7 the terminals 10 switch arm 1 is device 7 leaves speot-ively,

and 9. Likewise when the moved outward, the contact the terminals l() and ti before the carbon hlm-.ks sepas-atte so that :my ure formed h v the opening ot' the circuit will trike pince hetween the carbon blocks, instead ot' lwtweeu mctnllic surfaces.

Nour the upper end oi' the switch nrm is formed u lug 1t which is provided with n hiterally extending rod 2U which may take the form of o screw. Mounted upon the base board b', nbove the nrin 1 is a retaining,l mognet 121 having an armature 22 pivoted at 23. The armature carries a laterally and upwardly extending lug 24, und when the urin 1 is moved to close the circuit, the rod or projection 20 engages the side of the armature 22, to move the same against the nmgnet pole, and the magnetism of the magnet 1 retains the armature 22 in this position. The swinging of the armature 2:2 carries the lug 24 upon the exterior' ot' the pro'ection 20, so that the projection will rest 1n t e slot. formed between the lug und the armar-ure, und as long as the magnet 21 remains energized, the uvm will thus be held in n. closed position. when, however, the magnet 21 is denergized the armature 21 will be released ond the weight of the arm 1 will carry thc same. into position, shown in Fig. 2.

Mounted upon :t rod or shaft 2.5, supported in suitable bearings upon t-he has@ plete e', :ire rocking dogs 2li, 26, and 26". Euch or' the doos has its reml end so shaped us to engage the base plate 8, and linut the downwurd movement of the dog when free. Upon the end of the dog, to the righthand side, an upwardly extending lip 27 is formed which hasA its front edge curved and its rear edge perpendicular to the up )er surface of the dog. The underside of t e dog has a lip 2S, extending throughout its entire length, which is rounded ofi' at the leftn hund edge. The levers 1" to 1 are escl; provided with u. latch 29, pivoted to the erm at, 30, and set in aslot 31, formed in the arm, the walls of which slot limit the vertical movementof the hitch relatively to the Below the latch and formed integrally with the lever is a lug 32 Llprojecting outward toward the base plate an consisting of two ports 33 rind 24.

he part 33 is s nare in section and flat upon the end, and w en the lever is in a position to close the circuit presents s, vertical sur.- face. The upper part of the pert- 34 is inelined or chnmfered ot an nent-e angle.

Mount-ed in the bearings 35, formed in the brackets 4, is :1 rod or shaft 36, which at one end carries e. downwardly and laternllv projecting ann 37, and at its opposite end immeF diately beneath the lever 1c carries a1 cross erm 38. One end of the arm is provided with a roller 39 adapted to be pressed into engagement with the projecting end of the lever 1c, by a coiled spring 40 interposed between the opposite end of the erm and e stud or projection 41 extending from the base 8.

.\t` the lower left hond end of the hose S, n .sn-'itch nrni 4t2 is pivotully mounted und is held in its open or normul position h y n. coiled lspring' til, minimi-d upon thu pivot stud olL tho switch. This switch is ndaipted to mirko contri-et with the contact stud 44, nud when moved into engagement wit-h tho contact -H will he held in thut position hy the nrm 37, engaging.: over n pin or projection 4:3 on the arm 42, when the nrm .37 is moved inwn rdly by the closing ofthe switch 1". When the switch 1c is thrown closed, the extension thereotI moves the end carrying the roller 3) of the arm outxvnrdly, thereby rotating the shalt and throwing the :irm 37 inn'nrdly in n position to engnge the pin 45 nnd hold the switch against the tension ofthe spring43 'lhe circuit connections for my invention es applied to n stnrtirr,f rheostzit for motors nre illust-rated iu Fig. 6. Referring to this figure the contrari; terminal 1U is cininerted r. ith the positive side lo of the supplj- 11min, 11nd the terminal 1U is connected hy the conductor 4?, through the armature 4b' ol" the motor, ith the negative side 49 ol' the supply rnnin. 'lhe suite-h :trio 42 is connected by n conductor 5() with the nega-tivo side Ain of the supply mein, enti the contact 44 of said switch connected hy conductor 5l, through the resistance 52, with one terminal of the magnet 21. 'l'he opposite terminal of the magnet is connected by :L conductor 52 r. ith one terminal of the field winding' 53 of the motor, the opposite teminal of which is connected to the nega.- tive side 49 of the supply main. A branch conduct-or 54 also connects one terminal of the nnding 21 with the contact bar Q. A section ol resistance 55 extends between the contact har 9 and the contact terminal IU and a second resistance 56 is connected ontdoen Lite terminals i2 tutti imui is divided into sections and connected also with the terminal l0".

The operation of the device above described is es follows: Assuming that it bc desired to start the motor, the operator with one hand moves the switch 42 until it. eng eyes the contact 44. With his other hand the operator closes the lirst switch 1. Circuit is then established from the positive side 46 to contact 10, across the snit-ch l, by conductor 54, through the windimgr 21, through the resistance 52, by conductor 5l across the switch 42, and by conductor 5U, to the negative side of the supply main. This energizes the magnet. 21, end n hen the armature 22 of the mngnct is moved int-o engagement with the pole piece thereof, it is held in that position, therebv holding the arm 1 closed. 'The closing,r of the Snitch 1 also closes the circuit from the positive side to the mntnct terminal 10. thence across the arm 1, to the contract terminal 9, through'the resistnnces 55 und 56, to Contact temlinnl l, thence hy conductor 47, through the armature 4S of the motor, und brick to the negative side 4'.) of thc liuc. Circuit is also established from thc contact'. t), by conductors 54 und 52", through the shunt icld winding 53. The motor is thus started with all thc armature resisto-nce in circuit. ln moving the arm l to thc closed position, t'zo oblique wall 34 of the lug.;r 32 thereof engages under the face of thc first rocking dog 26, and moves the seme to the iosition indicatedin full lines in Fig. 3. 'l` io second switch erm 1" is now closed, and as the dog* 26 is in its raised position, the latch 29 of the a-rm 1 will ride over the lip 27 of the dog 26, and engage the vertical wall thereof, holding the swltc arm l in o closed position. The closin of thc switch l cut-s out one section 55 o the armature resist-ance. As the second arm 1Il is closed, the inclined n'n-ll 34 of thc lug 32 of this arm will engage under t-he face of the second rocking dogr 26, and raise this dog into its en raging position, where the lip 27 thereof wi l be engaged by the latch 29 of the arm 1*. Thcnrms may be thus successively ciosed'until all of the starting resistance is removed from circuit. During the closing operation, the switch 42 must he hold closed by the operator against the tendency of the spring 43. in order that thc circuit through the magnet- 21 will he maintained closed.. As the last Snitch 1* is closed, the arm 37 is moved inwardly until the end thereof lies in the path of the pin 45 and prevents the arm vfrom moving under the iniuence of thc spring 43 to an open position. The magnet 2l-is thus maintained operative until it is desired to open the circuit and sto the motor or until the current in the line fe ls below a predetermined point. If it is desired to cut in the resistance and open the circuit through the motor, the retaining magnet 2l is denergized in any desired manner, and the arm 1 will be rcleased and ily outward. In moving outwerd, the arm 1 permits the Bist rocking'dog 26 to fell and the latch of the switch l' is released. The movingr of the second Vsnit-ch arm to its open position releases the latch 26*l 4and dpermits the third `switch 4ui'm`v to open, an in a similar manner each svz'iizchv crm releases -thenertSmcQedngiarnl until all of theswitch arms AlurvcL-heen released.

y attempt Ito "closeone .of switch I `l armsV out of its rcgulerorder` prevente'` ed, due to the fact thctzthegzitfece 331vill'j` v eliges@ thevenidfof-the d'ewhnfn .lower Pitimfand it `isolrwlmi 0s 'f has been raised .to then'pw `thev lct face 3312s lthel endfoitlie'roc crm has boon closed. tentlonul closing of one of th(l switch arms out of its regular order is thus prevented.

switches, ofV retain of said switches in c sed positionI `manually operated means independent of sind switches for rendering said retaining means operative until a. certain switch is closed, and means operated by said switch lfor holding said manu switches, of vretaining means for of said switches closed, means independent 'of said switches which must be held during thev closing operation lng. said retaining 1 means o 1 svitches'ff 's magnet for `h'o said switches' ineiclosedposition, manually o ratedawhch `xnlistbe held l sufren The occidental or inl't muy lmp n that the operator after closing some o the switch arms und hcforo he closes the lust arm is called away from the storting device or through ignorance or carclessness leaves the starting device without having closed the lust switch arm. As soon, however, iis he releases thc switch 42 the switch under the influence of the will fly open, thereby opening the circuit through t mitting all of the arms to open und o n the circuit through the motor. fore be seen that it is impossible for a careless or ignorant opera-tor to leave a portion of the starting resistance in circuit. The Insistance of n storting device is usually constructed of wire which, while sutlicientla)r heavy to carry the current for a short period of time while the motor is being started, is not usually of suflicient capacity to carry current for a considerable period of time. As the operator can not leave the starting device without having closed the last switch, if he remains and holds the hand switch 42 closed and does not close all of the switches, he will immediately be notiiied of the fact by the heating of the resistance. seen that it is impossible for the operator to leave the resistance of the starting device in circuit for any great eriod of time spring 43 ic retaining magnet 21, and por- It wi there- It is therefore Having thus descri ed my nventlon what I claim as new and desire to secure by Letters Patent is:

1. The combination with e pluralitylof means for holding all ally operated means. 2. The combination with c.` Alllurelity of olding all vmeans operative, and emitednpbn manually` A for fender# 1 115 g. v the closlng of the last switch orV -holdmgsaid mimuellyheld d .efssingzopscmfor@dering-ssd 'maghe c1 operittionV for rendering said ma l'not operative, and means operated upon t io closinv of the last switch for holding said manually opera-ted switch.

5 5. The combination with a pluralitwof i switches, of a retaming magnet for holdin said switches closed, a switch manually heli during the closing operation for rendering said magnet operative, and automatically heh after the closing operation is4 com leted.

6. The combination with a purality of switches, of a retaining ma net for holding said switches closed, a switc i which must be manually held in operative position during the closing operation, and means operated by the last switch for holding said manually operated switch.

7. The combination with a plurality of switches, of a retaining m met for holding :u said switches closed, a switc which must be manuell held during the closing operation for ren er v said magnet operative, and a latch for ho dingI said switch when the last switch of the sequence is closed.

5 8. The combination with a plurality of switches, of a retaining magnet for hohling said switches ciosed, a switch which must be manually held durin the closing operation, and a latch operate by the last switch for 3o holding said manual switch.

9. 1n a motor controller the combination with a resistance, of a plurality of switches for controlling said resist-ance, a switch among 'said switches for controlling the motor a5 circuit,` a low voltage device coperating with said last mentioned switch whereby the same is operated to o en the motor circuit in event the voltage alls below a predetermined point, a switch operatively connect-ed with sind low voltage device having a tcnd- ,w ency to move to a position to cause said low voltage device to cause the circuit to be opened and adapted to be held by tho operator orainst moving to said position during the o using operation of the switches, and a latch operated upon the closing of the lest switch of the series for holding said switch in a position to render said low voltage device operatlve.

10. In a motor controller the combination with a resistance, of a plurality of switches for controlling said resistancez a switch among said switches for controlling the mo tor circuit, a low voltage device cooperating with said last mentioned switch whereby the same is operated to open the motor circuit in event the voltage falls below a predetermined point, a switch operatively connected with said low voltage device having a tendency to move to a position to cause said low G0 voltage device to cause the circuit to be opened and adapted to be held by the operator during the closing of the hrst mentioned switches against lnovinv to said posil tion and a latch operated 'oy last switch g5 for holding said low voltage device switch l against moving to a position to cause said low voltage device to cause the circuit'to be l opened.

In witness whereof, I have hereunto subi scribed my name in the presence of two Wit nesses.

HENRY J. WIEGAND. Witnesses:

T. E. Bumm, R. H. hhnsmnm), Jr.

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