Patent GB-190707883-A (GB)
Title: Improvements in Electrically Controlled Elevators or Lifts.
Inventor: NAUJOKS CARL
Filed: 1907-04-04
Granted: 1908-01-30
Abstract: 7883. Naujoks, C., Naujoks, F. C., and Goeppert, G. April 4. Lifts. - Relates to a push-button lift of the type in which the door where the cage is standing is normally retained open but is released to close on operation of any push, thus making through a relay the motor circuit with resistance in series therewith, the resistances being gradually cut out as the door closes. According to the present invention, means are provided whereby the motion of the cage may be interrupted at intermediate stages by operation of the corresponding push in the path of the moving cage. The power-control circuit comprises cage and landing pushes 34, 5 arranged in parallel circuits across the leads 1, 3, the circuits of each pair for a particular floor passing through floor solenoids 7 to contacts 13 fixed in the well and slidingly embracing flexible conductors 9, 10 fixed at one end 16 to the cage and at the other end passing round spring drums 11 at the top and bottom of the shaft. The ends 16 are arranged so that the contacts 13 are not in contact with the conductors 9, 10 when the cage is at the correspond. ing floor. The ends 16 are connected to contacts 18 over which passes a contact 19 on an arm 20 connected by a conductor 30 to the negative lead 3. The arm 20 is pivoted at 21 and contact 19 is normally retained by springs 141, to engage both contacts 18, but is drawn aside, as shown in Fig. 1, bv the friction of a grip 23 sliding on a cord 24 extending the length of the well during the movement of the cage so as to move off one contact 18 to cut out all the pushes behind the cage, but to permit the cage to be controlled by any push in the path of the cage. The motor circuit passes from the lead 2 in series through resistance switches 40 on each door, and branches at each floor through spring- controlled switches 37, normally held by catches 36 released when the circuit of any solenoid 7 is made by the operation of the corresponding push, and commutator switches 44 set by a projection 62 on the cage, through the motor 50, and back through the switches 44, 37 and field 61 to the negative lead 3. As the cage reaches a selected floor, the circuit of the corresponding solenoid 7 is broken by the contact 13 passing between the points 16, and the switch 37 is restored by a cam 80 on the cage and is retained by the catch 36. The motor circuit is therefore broken and the cage comes to rest. Fig. 2 shows the means for opening the door and putting in the resistances as the cage comes to rest. A shunt circuit containing a solenoid 84 is adapted to be closed by spring contacts 81 arranged in parallel and engaging the switch 37 prior to its restoration by the cam 80. The energizing of the solenoid 84 removes a catch 85 normally retaining a spring-controlled lever 88 carrying an arm 90 having rollers 91 adapted to engage a lever 93 connected by cords 95 to the arms of bell-crank levers 96, the opposite arms of which are connected by cords 99 to the door 67, so that the door is opened whatever the dtrection of movement of the cage, and is retained open by a catch 101. The lever 88 is restored to the catch 85 as the cage passes away by engaging cams 100. Each door carries a contact 105 which, when the door is opened, bridges contacts 106, 107 in circuit with solenoids 103 arranged in parallel in a circuit passing from the leadel through the contact 112 on the arm 20 to the contact 113 and in parallel through the switches 37 to the lead 3. When therefore any push is operated, the circuit of the solenoid 103 is closed through the corresponding switch 37, and the catch 101 is withdrawn to allow the door to be closed by the weights 104. The solenoid 103 is de-energized as the cage commences to move by the disengagement of the contacts 112, 113. A retarding- device 77 is provided to control the movement of the arm 20 to prevent the push - buttons from being effective until sufficient time has elapsed for passengers to enter or leave the cage. The door carries a pivoted lever 69 controlled by a spring 74 and having a spring contact 71 sliding over contacts 40 fixed in the door frame and connectei to starting-resistances 65. Tappets 75, 76 throw over the lever 69 at each end of the travel. Fig. 6 shows the grip 23 acting on the cord 24 and the retarding-device 77, which comprises spring pawls 124 thrown out of action by cams 125 and adapted to engage a ratchet 123, which is integral with a spur-wheel gearing with a pinion having a crank 128 connected to the piston-rod of a fluid cylinder 131. An automatic rheostat is provided in the power circuit comprising a motor 148 in a shunt circuit arranged to operate by cords a ratchet-wheel actuating an arm connected to the rheostat arm 146. The motor is automatically cut out by an arm 149 when the resistance is cut out, and the arm 146 is then held in position by a solenoid. When the lift is operated hydraulically, the control circuits operate two auxiliary motors arranged to throw over the main valve.