Patent GB-364773-A (GB)
Title: Elevator control system
IPC: B66B1/48
Filed: 1930-11-29
Abstract: 364,773. Lifts ; operating lift doors. WAYGOOD-OTIS, Ltd., 54, Fetter Lane, London. Nov. 29, 1930, No. 36062. Convention date, Jan. 16, 1930. [Classes 78 (ii) and 78 (iii).] Electric plant.-In a lift system used for conveying luggage &c. trucks from one level to another at a railway station a movable platform 44 .. 47, Fig. 1, is provided before the well doors at each landing and is arranged to operate switches for controlling the operation of the cage and the well doors when depressed by a load. Well doors 258 are provided at opposite sides of the well at each landing, and are of the kind in which the two sections in opening and closing move simultaneously in opposite directions in the same vertical plane. Motors 36 are provided for actuating the two sets of doors by cables 274 carrying blocks 275 disposed below bars 267 provided at the top of each lower door section 264. Each upper door section 263 is connected to a bar 267 by cables 265 passed over sheaves 266. Each bar 267 rests normally on the ends 270 of levers 268 pivoted in the well and carrying members 272 arranged in the path of cams 261 mounted on the cage 250. The ends of the cables 274 for the doors at one side of the well are connected to a member 277 which is connected by a cable 278 to a weight 284 slidable in guides 285 and controlling a switch 92. A projection 286 on the member 277 bears against the arms of spring- closed door limit switches 160, 167 when the doors are closed and open, respectively, to keep the bridge for the switch contacts disengaged there rom. If the service switch 8, Fig. 3, is closed and the empty cage is stationary at the lower landing, when a truck is moved on to the platform 46 at the upper landing, the platform will be depressed and the switches 53, 54 closed and opened, respectively. The closing of the switch 53 completes a circuit from the wire 66 to the wire 72 which includes the contacts T77 of a non-interference switch, the coil AA80 of the main motor up auxiliary direction switch, and the limit switch LD81. The energization of coil AA80 closes contacts AA83, and thus energizes the actuating coil A84 of the main motor up direction switch which results in the separation of contacts A93, A94, and the engagement of contacts A95 .. A99. The separation of the contacts A93 further opens the circuit for the actuating coil B100 of the main motor down direction switch, and the separation of the contacts A94 opens the circuit for the actuating coils of the auxiliary motor direction switches, and also the circuit for the actuating coils of the switches for the door operating motor 36, thus preventing energization of the motors 26, 36. The engagement of contacts A98, A99 prepare the circuits for the main motor 11 for an operation to move the cage upwards, and the engagement of contacts A96 opens circuits for the main motor up and down auxiliary direction switch coils AA80 and BB156 to prevent interference with the travel of the cage to the upper floor, opens circuits which prevent the operation of the motor 26 while the motor 11 is in operation, connects stator winding 13 of motor 11 to wire 124, connects stator winding 14 to wire 128, connects stator winding 23 of brake release motor 21 to wire 124, and stator winding 24 to wire 128. The winding 25 is connected to wire 133 by contacts A97, A99, and the winding 15 is connected to the same wire through starting resistance 18, and contacts A99. The energization of the windings 23, 24, 25 results in the operation of the brake motor 21 to release the brake 22, and to interrupt the mechanical connection of the auxiliary motor 26 to the hoisting sheave 251. The energization of the windings 13, 14, 15 results in starting the main motor 11 to move the cage upwards. As the cage leaves the lower landing, the cam 262 moves out of engagement with the operating arms of the limit switches LD150, LD151, LD70 and LD81 at the lower landing in succession, thus closing the switch LD150, and opening the others. The closing of the switch LD150 prepares the circuit for the actuating coil B100 of the main motor down direction switch, and the opening of switch LD70 de-energizes the actuating coil Z65 of the auxiliary door control switch, thus causing the engagement of contacts Z73 and the separation of contacts Z74. The engagement of contacts Z73 prepares the circuit for the actuating coil X76 of the door opening switch,. and the separation of the contacts Z74 opens the circuit for the actuating coil Y75 of the door closing switch. This latter circuit is opened further by the separation of contacts LD151 which also open the circuit of the coil X76. Upon approaching the upper landing the cam 262 closes the switches LU153, LU154, LU155, and opens the switch LU90 in succession. The closing of switch LU153 prepares the circuit for the actuating coil BB156 of the down auxiliary direction switch, and the closing of the switch LU154 prepares the circuit through the wire 69 for the coil Z65, which, however, is maintained open by the platform switch 54. The closing of the switch LU155 prepares the circuit of the coil X76 which remains uncompleted as the contacts A94 are separated. The opening of the switch LU90 de-energizes the coil A84, and this causes the engagement of contacts A93, A94, and the separation of contacts A95 .. A99. The separation of contacts A98, A99 interrupts the circuits for the stator windings of the main motor 11, and the separation of the contacts A97, A98 opens the circuits for the stator windings of the brake release motor 21. The brake 22 is thus applied to stop the main motor and bring the cage to rest at the upper landing. Upon reaching the door operating zone at the upper landing, the cams 261 on the cage engage the members 272 to unlock the doors 258, but the doors are held in closed position by the blocks 275. The engagement of contacts A94 completes the circuit for the coil X76 which on energization effects the engagement of contacts X163, X164 to connect the stator windings of the door operating motor 36 to the power circuit. As the motor rotates, the winch drum is rotated to pay out the cable ends attached to the members 277, and consequently the cables 274 are paid out. Since the blocks 275 move with the cables 274, the hanger bars 267 and the sections 264 of the unlocked doors also descend, and as the sections 264 are connected to the sections 263 by the cables 265, the latter sections move upwards. As the doors move from closed position, the door switches 92, 167 open and. close, respectively. The opening of switch 92 just mentioned, and the opening of the corresponding switch for the door at the opposite side of the well, de-energizes coils T102 and P103. Upon the de-energization of the coil T102, contacts T77 engage and prepare circuits for the coils AA80 and BB156. The de-energization of coil P103 separates contacts P122, P123 controlling the circuits for the motors 11, 21. The opening of the switches 92 also opens the control circuits to prevent energization of the actuating coils A84 and B100 of the direction switches of the motor 11, so that this motor cannot be actuated when the doors are open. The closing of switch 167 prepares the circuit for the actuating coil Y75 of the door closing switch. When the door sections reach open position, switch 160 is opened and deenergizes coils X76, whereupon contacts X163, 164 separate to de-energize brake release coil 42 and door operating motor 36, and the motor stops as the brake 43 is applied. Should the cage stop below the landing level, the levelling mechanism 255 on the cage is operated by the cam 257 in the well to close the levelling switch 34. This causes the actuation of the auxiliary motor 26 to bring the cage to the landing level. A levelling cam 256 acts in a similar manner if the cage overruns the landing. As the truck moves off the platform 46, the platform returns to its raised position, and the switches 53, 54 open and close, respectively. The opening of switch 53 further opens the circuit for coil AA80 of the up auxiliary direction switch, and the closing of switch 54 prepares the circuit for coil Z65 of the auxiliary door control switch, but this coil remains de-energized since before the rear wheels of the truck are entirely off the platform 46, the front wheels have moved on to the adjacent movable platform 57 in the cage, thereby effecting the opening of switch 61 which maintains interrupted the circuit for coil Z65, and the closing of switch 60 which prepares a circuit for permitting control of the cage by the cage pushbuttons 111, or the despatching buttons 113 at the upper landing. If a button 111 is pressed, the circuit for the actuating coil D186 of the down direction relay is completed, and the energization of this coil closes contacts D190, D191, D192 which prepare the circuit for the coil B100 of the down direction switch of the motor. 11, and complete circuits for actuating coils E202, Y75 of the door release and door closing switches, respectively. Consequently the door closes, and when fully closed the switch 92 closes and the switch 167 opens. The opening of the latter switch breaks the circuit of coil Y75, thus interrupting the circuits for the door motor 36 and its brake release coil 42. The closing of switch 92 completes the circuit for the actuating coil B100 of the down direction switch, and in consequence the motor is started to move the cage downwards. As the cage leaves the upper landing the cam 262 permits the closing of switch LU90 and the opening of switches LU155, LU154 and LU153 in succession, these switches performing the same functions as the switches LD150, LD151, LD70, and LD81 abovementioned. As the cage approaches the lower landing, the cam 262 closes the switches LD81, LD70, LD151 and opens the switch LD150 in succession, and the cams 261 engage the members 272, thus stopping the cage and opening the doors in a similar manner to that described