Patent GB-1392951-A (GB)
Title: High safety complex lift system with electronic control
IPC: B66B1/14
Filed: 1972-03-13
Abstract: 1392951 Lift control systems; hoisting apparatus LICENCIA TALALMANYOKAT ERTEKESITO VALLALAT 13 March 1972 [11 March 1971] 11679/72 Headings B8L and B8B [Also in Division F2] In a lift control system for apartments (which can be modified to give distinct operating characteristics for (a) hotels and offices or (b) business establishments) in which each lift of a bank of lifts can operate only when all the doors are shut to complete a circuit through contacts mounted on a respective door frame A, a further set of contacts 6 are provided, contacts 5 being closed, contacts 6 open when the door is shut. Should one of contacts 5 fail to open on opening of a door, the subsequent closing of the corresponding contact 6 completes a circuit for electromagnet 8, interrupting the lift motor circuit, contacts R, S being connected to a relay MT in the motor circuit. Each door is locked shut by projection 15 and magnet 11 operating contact 5, and no door can be unlocked, by electromagnet 4 drawing lever 19, unless all doors are initially locked, closing contacts 7 actuated, as are contacts 6, by magnet 16 on door leaf B. Hall and car call buttons are in parallel, and calls from either are registered in bi-stable units (M), Fig. 1 (not shown), see also Figs. 2, 2a, 2b (not shown), two of which are provided for each intermediate floor, and, on lines (ILE) or (IFEL) actuate the lift start control circuit for the appropriate direction, the call stored in a bi-stable unit being cancelled when the call is answered. A lift floor load device, Figs. 22-24 (not shown), causes, via contacts (Le to) or (J to, Fig. 1), the cancellation of any calls when the lift is full, a light indicating to a user that call re-registration should be made later. The lift has two speeds, and contacts (17) in the shaft operated magnetically control fine levelling. Lights at each landing indicate that a hall call is registered, and upon the door being unlocked after lift arrival, a further light indication is given. When a call is registered at a floor, a capacitor is charged by a unit (M), and in discharging into contacts (AF), or (AL), controls the stopping of the lift. (a) Hotels and office buildings.-Four bistable units, Fig. 5 (not shown), are provided for each intermediate floor, units B storing car calls, unit K storing hall calls, should the floor load sensor indicate full load, response to all hall calls is blocked via respective transistors, but the calls remain registered. (b) Business establishments.-Hall calls are stored in first or second order data storage rows of bi-stable units, Fig. 6 (not shown), in dependence on the relative location of lift and call. Should a car pass a call registered in one order without answering it, the call is transferred to the other order. Collective control systems.-The cars may be used in a preferential sequence, all calls being allocated to a first car until its floor load causes transfer of further service demand to a second car in the sequence via contact (P A ), Fig. 11 (not shown). Each car may be switched into the sequence. A faulty car is automatically removed from the sequence and its calls transferred to the succeeding car or to the preceding car if the faulty one is last in the sequence. For each call, a light indicates which lift will respond. Mechanical construction Guiding gripping device, Figs. 15, 16 (not shown).-The weight of gripping wedges (2) overcomes the forces of spring (8) so that they rest on rollers (3). Loss of wedge weight consequent upon downward acceleration due, for example to broken cables enables springs (8) to draw wedges (2) upwards against circular guideway rail (1). Setting of support members (6) and screws (7) governs the retardation characteristics. Equalization of cable loads, Figs. 17, 18 (not shown).-Segments (2) sandwiched between cable support grooved plastics members (5) of the driving pulley allow the latter to slide angularly relative to one another, bolt spring assembly (3, 6) being set to ensure that the above sliding occurs before the cables slide in the grooves. Emergency brake, Figs. 20, 21 (not shown).- Excessive speed operates latch (6) so that cable (3) is pulled into wedge (7) by weights (5). The wedge angle may be chosen to ensure self locking of the brake. Guiding wheels, Fig. 19 (not shown).-Boss and grooved disc (8) support one cable, the remainder passing over grooved discs (9) free to  rotate relative to boss and disc (8). Lift car floor load sensing, Figs. 22-25 (not shown).-Suspended floor (11), via bell cranks (9), and roller bearing cams (5, 6, 7) rotates a pair of weights (3, 12), movement of axle (1) operating the load sensitive control switches. Lift car guides, Figs. 26-28 (not shown).- To allow for helical distortion of the circular guide rails, upper guides (2) are mounted on axle (4) pivoted at (3) to the car, the lower guides (1) being fixed to the car. For a cargo car, the car may rotate by 90 degrees, or 180 degrees between loading stations. Guide rail brackets, Figs. 29, 30 (not shown).- One guide rail is fixed in the shaft, the other being mounted on a beam (3) pivoted at end (7), the other end being free to move by deforming elastic inserts (6). The car is guided without clearance between guide rails and guides. The guide rails may be drawn tubes.