US1225976A - Elevator-control system. - Google Patents

Description

D. L/XRSON.

ELEVATOR CONTROL SYSTEM. APPLxcATloN HLED JULY 30,1912.

,225,976 Pam-@a May lem.

:Devin Lnnson,

, w y, ai ventenni.

Application filed .'uly 3Q, ll.

Be it known that I, Davie LAnson, a sul)- ject of the King of Sweden, residing at Berlin, in the Province of Brandenburg and.

Kingdom of Prussia, Germany, have inventf ed a new and useful Improvement in Elevator-Control Systems, of which the following in a specification.

My invention relates to elevator control l@ systems, and incre particularly to a system et control for automatic alternating current electric elevators.

One ci' the objects of my invention is the provision of a simple, cheap and effective system of controlling elevators, and it coni sists in the Various features of construction. and arrangement of parts having the general Inode of. operation substantially here-- inafter more particularly set forth.

Referring to the accompanying drawing', wherein have illustrated diagranuna-tically a system of control containing an enibodt ment of my invention, S designates a switch which connects and disconnects the system of control and a source of three phase alte).-` vnating current supply indicated hy the conf ductors c, Zi and c. An electric motor M is connected through. suitable inclosed gearing' to a Winding drum G about which are wound 3o the Galilee' l and 2 connected to the counterbalance weight lll? and elevatoi ear C, respectively. ifrn electrically operated brake lll may be arranged between the motor and the winding drum and the saine operates to stop the lioisting n'iachinery every time the line current is cut oil from the motor and is released when it is desired to start the eleva tor. ylhe motor M is here shown as a three phase inotor Whose rotor or secondary winding' is tlo connected through the slip rings 3 which in 'turn are connected to a starting resistance Ri. The starting resistance is nornnilly in cir cuit with the rotor Winding of the motor when the motor is at rest out .may he varied e5 or gradually shortcircuited by means of accelerating switches, 4, 5, 6 and 7 to eli'ect the accelerating of the motor to full running' speed. Three of the accelerating switches are substantially the saine in construction.

the last one designated by 7 comprising' in addition to its resistance controlling contacts a dashpot 7 which retards its closing' action and an insulated contact l) which is adapted to pass over and make Contact with a series @timed contacts, i0, vlll enel l2? which Specification of Letters Patent.

connected to the :magnet windings of the accelerating switches 4, 5 and C, respectively. The direction of rotation of the motor is controlled by means of the reversing switches ll and l), which are similar in, construction 3o and operate 'to interchange or reverse the inain line connections and c, the middle main being' connected directly to the stator winding of the motor. il. circuit closing switch lo controls the inain line circuit to o the motor and the saine oper-etes only after the reversing' switches have first established the proper motor connections, so that the inotor will rotate in the desired direction when its circuit is closed to the main line at '7G the contacts of the switch L, rEhe reversing switches 'U and l) are provided with noninterterence contacts, 257.26 and 27. 28, respectively', which are always in closed circuit relation when both of the switches are de- 7 energized, hut will operate to prevent a false operation when the coi'itrolling' system is in oiieration. At each floor landing is a push button, 29, 30, 3l and 32, also a, door contact 33, the latter being closed whenever the 8 correspiinding door is closed and vice versa. The elevator car C has a series of push but tons, 34, each button corresponding to a licor landing, and the car also contains a stoy button and ear Contact 3G. H desin` 55 nales a. floor controller, and while the saine may lie ci? any de 'red type of which there are several, l prefer to employ the one shown diagrmnnialically on the drawing, which similar to that shown and described in pat- -f ent to (lariclioi'l, 783,174-, February 2l. 1905, system of electrical control. This `controller comprises a series oiL cani operated circuit controlling switches, 5G and el?. i'lfhich are operated hy a corresponding serie.' oi rotat- 95 ingr arms geared to some moving part ot the hoisting machinery, such the drum :shait for instance, and moving in synchronisni with the elevator car. Similar switches. 57

and 5S are normally closed and only operate l0( at the liinits of car travel. There are lloor relays, 5G, 5l, 52 and 53, corresponding' to the push buttons in the car and at the various iloor landings, There is also a non-iui'eriereuee magnet S7. comprising' double 105 wound coils, 38 and 39. and an armal ure 41,

(a. ming a. pair o con a( ,a 1 ne 4... ai.

Llf3 ie: normally in electrical engagen ned contact lil, Ywhile the concontact, 40 l l' car when the latter overruns its norma 6," fwhich is common to all of @clays` through the slack cable switch 59 il Y 1,225,9'7@

when 'the magnet 237 is energized, A slack cable switch, 59, and limit s w'itces 61 and 62, are arranged toward the top and bottom of the hatciiway and are operated bfxthc nnits of travel in either direction. A governor switch 60, normally iir closed position, is shown, but which will-open to interrupt the operating circuit Whenever the car attains en excessive speed Having described the parts of the a paratus, I will point ont the operation o the system. Assuming the car to be at rest oposite the second Hoor landing, -as shown, liat it be supposed that a passenger on the third Hoor landing desires to use the elovator car. Uponv pushing the button 3l a circuit is established to thevioor relay 5'?, which circuit ma)y be traced from the main c, through the wire (i3, contacts .218 and 2li of the respective reversing switches l) and U, resistance 45, contacts and 44 of the non-interference magnet switch 37, wire Gel, which is common to all of the floor landing buttons, through the push button 31, wire 6,5, winding ot' relay 52, and hv the wire the floor and. to the main a. The relay 52, with thc resistance 45 in series with it, is now con nected 'across the mains c and a, and the relay will'at once operate to close its contacts 54, thereby establishing a circuit through the iioor controller H and the magnet of the reversing switch U. This latter circuit may be traced from the main a, through the conductor 66, relay 52, relay contacts 54, contacts 48, 47 and 49, of the floor controller, contacts of switch 57, coutacts 27, the magnet winding of the reversing switch U, wire 67,-door contacts in serles, car gate contact 36, contacts of stop switch 35, and by thewire'GS to the main b. The closing of l,the Vrelay contacts 54 establishes a self holding circuit for this relay and for the magnet winding of the reversing switch U, and the push button 31 may now be released without interruptingr this self holding circuit. The reversing switch U is now energized to close its upper contacts 13 and 15, and open the lower contacts 25 and 9.8, The closing of the contacts 1.3 and lenergizcs the contacts-20 y switch lli, which circuit may be trucco irom the maine, through the contacts i5 and lil. winding of the switch L, through the limit switches of. and 6l, governor switch con taci-s GG, tc the main The switch L now operates to close its conta-ats 20, Qi, and 15P-22, and thus close nicht: to the stator Winding of the motor M, and the breite B, and the motor starts at slow speed to raise the elevator ear, its speed being limited due to the resistance R being' in the rotor circuit at this time. Upon closing a circuit to the motor and brake, a circuit also closed to the accelcnatiug magnet i' through the conductors 69 and T0, the latter ronductor being conunon to all of the accelerating magnets 4, 5. G and T. Since the ac` celcratingv magnet i" is energized, it starts slowly to raisel its core, this action being retarded by the dashpoi 8, hence it will take an appreciable period ot time before the contact 9 engages the contar( il). When this does orrur, a circuit is closed to 'the magnet winding et the accelerating switch 't and the leiter innnmliatelv raits corr l und connected contacts into engagement with the corresuuuling' stationanxf' contacts directly above to 'short circuit a portion of the starting,r resistance an'dallov.' the motor to increase its speed. .\s the core of the a celeratingr magnet T continues to rise it successiveliv euergrizes the magnet windings of the acceleratingl switches 5 und (i which operate in turn to short circuit additional portions of the starting resistance further to increase the speed of the motor, until finally the accelerating switch 7 has reached the limit of its movement closing its upper contacts, whereupon all of the starting resistanre will be short circuiicd andthe motor will have reached full running speed with short circuitcd rotor. t

Tt will 'be observed that the contact 9 in passin, r over the stationar)v contacts l0, 1l and l2.'mal{es contact with one of the contacts such as 'll before it leaves the contact 10 next to it. Thus when the accelerating magnet 7 operates, the resistance R is gradully short-circuited by the magnets 4, 5, 6 and T, and furthermore. when the magnet 7 has reached the limit of its movement in an upward direction, the Contact 9 has been carried out of engagement with all of the contacts 10, 11 and 12, and the magnet alone remains energized. rlhis method of operation effects a considerable saving in current consumption and prevents the accelerating magnets l, and 6 from becoming over@ heated since they are only momentarily energized. i

In order to guard against any possible interference from'anothcr iloor push button, l have provided thc non-interference contacts 26 and 2S ou the reversing switches, and it willbe observed that as soon as one of the reversing switches such as U starts to move, and before it has closed its upper contacts, the contacts 20 will be separated,l

iso

ivonlri very soon over-heet und iernege the motor. f

like operation of lie System for e de.- seenriiw elevator ear is similar to that el ready n seribecl, tlie lioor controller.1 eireuits being such that the reversing switch D Wil] be energized inst-enel of the reversing switch U :is `before. The lower ' contacts 28 and 27 of the switch D effect the same or similar re'- eults :is the Contacts 26 and Q5 respectively of the switch U., to prevent interferenee from the 'push buttons and to prevent the simultaneous operation of the reversing switches.

In emmeetion with the non-interference magnet 37, it 'will be noted that it performs time double function of preventing interference 'from the floor buttons lifter e car button luis been opereted end the enr is in motion, :1nd also to prevent such interferenee even after the cer has come to rest at the designated Hoor landing; thus after the enr luis come to rest the passenger must first leave the enr :mil eiosc -tlie enr gate )nid inmlingi: door :ifl'er liini iwiore it is possible to obtain eontrol of the eievntor eer from combination of uvpolyphase supply circuit,

en alternating current motor, n magnet controlled reversing switch for the motor, n magnet controlled main line switch for the motor, a relay controllin the reversing switch, and e push button lor o ernting the relay, the operating magnets o. the reversing switch, mein line switch und relay bcing connected in u different phase of the snpply circuit.

In testimony whereof, I have signed my nume to this specification in the presence of two subscribing witnesses.

DAVID LARSON. Witnesses I llnNm ll'Asi'nrc, v/vormen An ll A U1 "r.

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