Patent GB-347707-A (GB)
Title: Improvements in or relating to electrical signalling systems for elevators
IPC: B66B3/00
Filed: 1930-01-28
Abstract: 347,707. Lifts. WESTINGHOUSE ELECTRIC & MANUFACTURING CO., East Pittsburg, U.S.A.-(Assignees of Bouton, E. M. ; 1300, North Branch Street, Chicago, and Atkinson, W. S. ; Ashland, New Jersey, both in U.S.A.) Jan. 28, 1930, No. 2919. Convention date, Jan. 28, 1929. [Class 78 (ii).] In a high-speed lift system having control apparatus adapted when the cage is running at normal speed to stop it in a predetermined distance and call or stop devices pertaining to the floors and located at them or on the cage, or on both, for signalling or determining the floors at which the cage shall stop, a signal device, preferably an electric lamp HLA, is provided on the cage which is actuated by a call or stop device to give an indication upon the arrival of the cage at a position in advance of the predetermined distance from the floor at which retardation should commence for accurate stopping. An additional signal device SLA preferably is provided on the cage which indicates when the cage is stopped at a floor, or operating at a speed which is less than the normal high speed, that a stop is to be made at the next floor. The hoisting motor for the cage A is controlled by an up-direction switch 11 and downdirection switch 13, and the lamp SLA is connected with contact members 15, 16 on these switches in such a way that it can only be energized when the cage is standing at a floor. The cages are connected electrically to indicating devices, preferably electric lamps, at each floor. Each of the top and bottom floors has a single lamp for each cage, and each intermediate floor has a pair of lamps such as L2D, L2U for each cage, one of which indicates that the cage is travelling upwards and the other indicating downward travel. Pushbuttons such as 2D, 2U are provided at each floor and are associated with relays such as 2DR, 2UR for holding the pushbutton signals until they are completed or reset, and with reset relays such as 2US, 2DS. Pushbuttons A2 .. A5 mounted on the cage A are operated by the attendant to set the signal giving devices to indicate stops. These buttons are held in the depressed position by a coil 19 which is connected directly to the leads L1, L2 and is de-energized only when its circuit is broken momentarily near the end of each run by an up limit switch ULA or a down limit switch DLA actuated by the engagement of an extension 21 on the cage with one of the extensions 22, 23 on the limit switches. A floor selector FSA of the kind usually employed in lift signalling systems connects the various circuits for the pushbuttons, floor lamps and signal devices in the cage in accordance with the position of the cage. A pushbutton switch 28 on the cage is provided for cutting out the signals in the cage and the corresponding floor lamps when it is desired to pass the floors for which signals have been given. When the system is employed in conjunction with a number of cages, the call or stop devices at the floors may be common to all the cages and arranged so that on stoppage of a cage at a floor in consequence of the actuation of a call or stop device, the call or stop device is restored to normal while the call or stop devices on the cage may be arranged, when actuated, to be maintained actuated until the cage arrives at a terminal.