Patent GB-394130-A (GB)
Title: Improvements in lift systems
IPC: B66B1/18
Filed: 1932-05-23
Abstract: 394,130. Lifts. ETABLISSEMENTS EDOUX-SAMAIN SOC. ANON., 76, Rue Lecourbe, Paris. May 23, 1932, No. 14618. Convention date, June 16, 1931. [Class 78 (ii).] Electric plant.-A control system of the type having a despatch relay for each floor for each lift in the system includes a step-by-step selector used in automatic telephone systems for bring- ing said relays into operation successively, means associated with a single call button at each floor for registering a call by holding prepared a supply circuit to said selector for each lift, and means associated with the use of a lift for completing said supply circuit and putting the selector into operation as soon as a lift is available. The diagram illustrates, a system in which three lifts serve four floors. The call buttons A .. D at the floors when pressed energize relays A‹ .. D‹ and thereby effect the closing of the contacts a‹1 .. a<0>5 ; b‹1 .. b‹5; c‹1 . . c<0>5, and d‹1 .. d<0>5. The contacts a<0>1 .. d<0>1 are holding contacts. The closing of the contacts a‹2 .. a‹4, &c. connects one of the leads with a series of contact studs 1 .. 12 by means of contacts p<1>1' m<1>1, o<1>1, &c., and groups of two circuits placed in parallel of which one group comprises contacts l<1>3 .. l<3>3, l<1>2 .. l<3>2 and the other group comprises contacts sp<3>3 .. sp<1>3. Corresponding studs 11 .. 12<1> face the studs 1 .. 12, and are connected respectively to the relays A<1> .. D<1>, A<2> .. D2, A3 .. D3, the energizing of any one of which sends a corresponding lift to a corresponding floor, e.g. the energizing of the relay B<2> sends lift number 2 to the second floor. The energizing of these relays also opens the contacts a<1>2 .. d<1>2, a<2>2 . . d<2>2, a<3>2 .. d<3>2. Corresponding pairs of studs are successively put in contact by a step-by-step selector M, the circuit of the motor of which includes the alternative contacts l<1>1 .. l<3>1, in series with the alternative contacts a‹5 . , d‹5. Contacts s<1> . . s<3> at the principal floor are closed on the arrival of the corresponding lift and effect the energization of the relays SP<1> .. SP<3> if the contacts sp<2>1, sp<3>1; sp<3>2, sp<1>1, sp<1>2, sp<2>2 are closed also. These contacts normally are closed, but are opened when the respective relays are excited. Since the first lift which arrives at the principal floor excites the corresponding relay SP and opens the corresponding pair of the contacts sp<1>1 .. sp<3>2, no other relay can be excited on the arrival of another lift at the floor. The excitation of a relay SP opens one of the series contacts sp<3>4, sp<2>4 and sp<1>4, and opens also one of the contacts sp<1>3, sp<2>3 and sp<3>2 thereby opening one of the two circuits supplying current to the contact studs of the selector which correspond to the lift. The contacts l<1>1, l<2>1, l<3>1 are open when the relays L<1>, L<2>, L3 are de-energized which occurs when one of the contacts m<1>2 .. o<3>2 is opened by the corresponding lift being in motion, by the depression of its floor by the weight of the user, or by the opening of a door. The relays actuating the contacts m have delayed de-energization in order that when a lift stops at a floor, the user has time to enter it and bring about the excitation of the relays controlling the contacts p before the contacts m reclose. An appropriate number of electric lamps placed. at each floor are controlled by the relays A‹ .. D3.