Patent GB-282718-A (GB)
Title: Improvements in dispatching and scheduling systems for a series of lifts
IPC: B66B1/18
Filed: 1927-11-07
Abstract: 282,718. Waygood-Otis, Ltd., (Assignees of Yearsley, E. W.). Dec. 29, 1926, [Convention date]. Electric plant.-In a lift system comprising a number of lifts, standing signals are given to the lifts at a despatching floor at regular intervals of time. These signals are given to the lifts in the order of their arrival at the floor. Signals are also displayed which notify passengers in advance which lift will be the next to leave. Means are provided for varying the time interval between successive starting signals and for cutting out of operation one or more lifts without disturbing the operation of the other lifts. In a system comprising three lifts 11, 12, 13, Fig. 1, electric lamps 21, 22, 23 indicate to the passengers which lift is to be the next to leave and lamps 24, 25, 26 give a similar indication to the lift attendants. The starting signal may be given by lamps 27, 28, 29 or audibly. Two starting lights may be provided for each lift, one of which is outside the lift and visible to the starter, and the other of which is inside the lift and visible to the attendant. The controlling apparatus for the signals is mounted on a panel 19, Fig. 2, arranged within a box 30 at the floor, and comprises three switching mechanisms, 32, 33, 34, Fig. 3, each of which is actuated bv a motor 31. The switching mechanism 32 controls the lighting of the lamps 21 - - 26 as the lifts arrive at the floor and select the lift for which these lamps will be lighted and for which the starting signal will thereafter be given in the event of two or more lifts being at the floor together. The switching mechanism 33 controls the lighting of the lamps 27, 28, 29, and the mechanism 34 stops the motor 31 to delay the giving of a starting signal if there are no lights at the floor and if no lift arrives within a predetermined time after the giving of the last starting signal. The mechanism 32 comprises switches 35, 36, 37 for the lifts 11, 12, 13 respectively, and operating cams 40, 41, 42 mounted on a shaft 38 driven through worm gearing 56, 57 by the motor 31. As there are three lifts the cams are disposed so that their actuating parts are 120‹ apart. The mechanism 33 comprises a switch 60 common to all the lifts and an operating cam 61 adjustably secured on a shaft 62 which is driven through worm gears 78, 80 by a shaft 81. A friction disc 82 of the shaft 81 is driven by a friction wheel 83 mounted on the shaft 38. In order that the time interval between successive starting signals may be varied, the wheel 83 is mounted so that its position may be varied with respect to the centre of the disc 82. The mechanism 34 comprises a switch 70 and a cam 71. Switches 95, 96, 97 are provided in the wells and are actuated by cams 98 on the lifts as they arrive at the floor to control the giving of the signals and the actuation of the motor 31 in conjunction with the foregoing apparatus. Each switch has two pairs of contacts 104, 105. Electromagnetic relays A, B, C, Fig. 2, mounted on the panel 19 act in conjunction with the switches 95, 96, 97, and switch mechanisms 32, 33. Each relay has two pairs of forward or closing contacts 121, 122, and one pair of back or opening contacts 123. manually operated double switches 150, 151, 152 on the panel 19 allow any lift to be cut out without disturbing the operation of the system with respect to the other lifts. Pairs of switches 153, 154, 155 on the lifts allow the temporary cutting-out of each lift to permit it to proceed to a floor beyond the despatching floor. A wiring diagram is given in the Specification.