US3882969A - Safety system for controlling the start-up of elevators - Google Patents

Safety system for controlling the start-up of elevators Download PDF

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Publication number
US3882969A
US3882969A US370186A US37018673A US3882969A US 3882969 A US3882969 A US 3882969A US 370186 A US370186 A US 370186A US 37018673 A US37018673 A US 37018673A US 3882969 A US3882969 A US 3882969A
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United States
Prior art keywords
circuit
signal
door
discriminators
safety circuit
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Expired - Lifetime
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US370186A
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English (en)
Inventor
Abelardo Podcameni
Aldo Alves Goncalves
Sebastiao Kirk
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/24—Safety devices in passenger lifts, not otherwise provided for, for preventing trapping of passengers

Definitions

  • the present invention refers to a safety system for installation in elevators. Its object is to protect the users from accidental crushing and from falling into the well. It operates to prevent the start-up of the cabin if any door is open or unlocked. If the safety system is damaged, tampered with or short-circuited on purpose or by accident, the elevator will still remain stationary just as it will if manual actuation is attempted for startingup the elevatorfrom the engine room when any door is open or unlocked. This is the novelty characterizing and distinguishing the present invention and by which a.
  • a lock which is the fixed part and independent of the door and b.
  • a latch which is the part integral with the door.
  • a feed line having an electric signal of a given type and value is connected to the lock.
  • an electric circuit capable of modifying the nature and/or the value of the signal from the source of supply.
  • the modified signal is then transmitted along the line independent of all the others to the engine room and introduced into a discriminator.
  • the discriminator is a circuit capable of recognizing the signal, duly modifled by the action of the circuit in the latch and only capable of operting when it receives this signal at its input.
  • the discriminator supplies an output logic signal.
  • the line from each lock is led to its respective discriminator in the engine room.
  • the outputs of all the discriminators are connected to a coupling circuit which carries out an AND logic function, that is: there is a logic output signal only when there is a signal at all of the inputs.
  • This signal operates a control switch which serves for switching the lines from the direction switch to the drive motor and also those going from the brake operator (if there is one) to the service brake.
  • the manual operation of the control switch cannot be effected by unqualified personnel since the control switch, the discriminators and the coupling circuit are maintained within a locked metallic box.
  • the demand wiring to and from the metallic box passes within metallic conduits.
  • the terminal box of the motor is sealed.
  • the short-circuiting of a lock-line makes the signal from the supply source pass to the lock-line and to the input of the discriminator without modification whereby the discriminator does not operate.
  • the modification of an electrical signal from a supply source can also be made by placing a circuit in parallel with the discriminator input, that is: a part of the signal from the supply source is always present at the discriminator input until the moment when said circuit is placed in parallel with the discriminator input and the nature and/or value of that part of the signal, previously present, is modified and the discriminator operates.
  • This arrangement has the advantage of making the metallic mass of the lock and latch electrical conductors (ground line or neutral line).
  • the discriminators are logic output circuits, that is to say, when operating or not, the discriminators are also used for switching on small lamps placed on the outside of said metallic box for indicating if a door, and which door, is unlocked: these are door monitors.
  • Other lamps are energized in correspondence with the operation of the coupling and control circuits: these are function monitors.
  • lamps will light if the direction switch is actuated when the control switch is inoperative: these are fault monitors.
  • there is another fault monitor which indicates when only one of these elements is operating.
  • the above more sophisticated version facilitates maintenance of the apparatus as well as indicates whether there is a fault or not in the safety system.
  • blocks L L L represent the latches of the elevator doors on each floor of a building.
  • the latches represented by the blocks are preferably those fixed to the doors themselves rather than to the door posts.
  • Each latch is a suitable mechanical latch which may also electrically control the operation of the elevator motor.
  • each latch includes a device 1 which is placed in circuit only when the elevator door on that floor is closed.
  • the device 1 comprises any suitable element or combination of elements for modifying the signal on input line 1 from a source 2.
  • This device may be, for example, a Zener diode for altering the signal amplitude, a resistor for modifying the current, a transformer for modifying the polarity, a capacitor for modifying the phase or a combination of such elements for modifying the RMS valve of the signal from the source 2.
  • each latch L to L When the doors are open the electrical signal leaving each latch L to L, is identical to the signal on line I.
  • the device 1 When a door is closed the device 1 will be introduced into the circuit in the corresponding latch L, L, whereby the signal on the corresponding output line 3 3,, passes disponding discriminator D D
  • Each discriminator gives an output to a logic AND circuit determined by the nature of the signal on corresponding line 3 3
  • the AND circuit is arranged to give an output when all the latches L Y. L, are closed, that is to say when there is a modified signal on each of the lines 3 3
  • This output from AND circuit 4 controls a main control switch 5 in such a way that switch 5 is closed only when all latches L to L are closed.
  • Switch 5 is in circuit with the elevator motor and brake whose operations are all controlled by the conventional control circuit 7.
  • the control lines from circuit 7 pass in the form of a cable to the input side of switch 5 whereby no control can be effective with respect to the motor and brake 6 unless switch 5 is closed.
  • the discriminators, the logic AND and switch 5 are all contained within a closed metal box 8 and the cables leading from control 7 to the interior of box 8 to switch 5 and leaving box 8 from switch 5 to the motor and brake 6 are contained in metallic protective conduits;
  • Each discriminator D D is connected to an indicator panel 9 on the outside of box 8 including individual lamps which only light when a corresponding door is opened. These lamps serve to indicate when there is a fault in any of the discriminators.
  • a further panel 10 having two indicator lamps on the outside of box 8 is connected to AND circuit 4 one of the lights being energized only when a door is open and the other being energized when all the doors are closed. The two panels 9 and 10 serve to detect errors in the discriminators or the logic circuit.
  • an elevator system including a vertical shaft extending through a plurality of building floors and hav-v ing a shaft opening at each floor to permit passenger access, door means at each floor for closing the respective shaft openings, an elevator cab suspended in the shaft for bidirectional vertical movement therein, control means, and drive motor/brake means for moving the cab in response to the'control means, an improved. safety circuit comprising:
  • a safety circuit as defined in claim 1 wherein the means for detecting comprises a plurality of discriminators individually coupled to the signal modification means, and an AND circuit having its inputs coupled to the discriminator outputs.
  • a safety circuit as described in claim 2 wherein the means for enabling comprises a switch connected in series in the circuit of the drive motor/brake means and operable to complete said circuit in response to anoutput from the AND circuit.
  • a safety circuit as described in claim 3 further comprising a first indicator panel having a plurality of lights individually connected to the discriminators for indicating when an associated door means is opened, and a second indicator panel having two lights connected to the AND circuit for indicating when any one of the door means is opened and when all of the door means are closed.

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  • Elevator Control (AREA)
US370186A 1972-06-14 1973-06-14 Safety system for controlling the start-up of elevators Expired - Lifetime US3882969A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BR3809/72A BR7203809D0 (pt) 1972-06-14 1972-06-14 Sistema de seguranca para controle de partida de elevadores

Publications (1)

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US3882969A true US3882969A (en) 1975-05-13

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US370186A Expired - Lifetime US3882969A (en) 1972-06-14 1973-06-14 Safety system for controlling the start-up of elevators

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US (1) US3882969A (pt)
BR (1) BR7203809D0 (pt)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101007A (en) * 1976-11-01 1978-07-18 Magee John E Control system for limiting elevator car movement speed unless car doors are fully closed
US4623040A (en) * 1985-03-04 1986-11-18 Otis Elevator Corporation Method and apparatus for reducing elevator service calls
US4785914A (en) * 1987-06-19 1988-11-22 Westinghouse Electric Corp. Elevator system leveling safeguard control and method
US6056088A (en) * 1997-09-22 2000-05-02 Inventio Ag Elevator safety circuit monitor and control for drive and brake
US6193019B1 (en) * 1998-04-03 2001-02-27 Otis Elevator Company Device for localization of a door breakdown
US6712183B2 (en) 1998-03-12 2004-03-30 Kabushiki Kaisha Toshiba Traction elevator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1810942A (en) * 1929-12-04 1931-06-23 Otis Elevator Co Closure operating mechanism
US1934500A (en) * 1931-02-28 1933-11-07 Westinghouse Electric & Mfg Co Automatically operated elevator door
US2111459A (en) * 1933-05-18 1938-03-15 Molander Veli Elevator door control system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1810942A (en) * 1929-12-04 1931-06-23 Otis Elevator Co Closure operating mechanism
US1934500A (en) * 1931-02-28 1933-11-07 Westinghouse Electric & Mfg Co Automatically operated elevator door
US2111459A (en) * 1933-05-18 1938-03-15 Molander Veli Elevator door control system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101007A (en) * 1976-11-01 1978-07-18 Magee John E Control system for limiting elevator car movement speed unless car doors are fully closed
US4623040A (en) * 1985-03-04 1986-11-18 Otis Elevator Corporation Method and apparatus for reducing elevator service calls
US4785914A (en) * 1987-06-19 1988-11-22 Westinghouse Electric Corp. Elevator system leveling safeguard control and method
US6056088A (en) * 1997-09-22 2000-05-02 Inventio Ag Elevator safety circuit monitor and control for drive and brake
US6712183B2 (en) 1998-03-12 2004-03-30 Kabushiki Kaisha Toshiba Traction elevator
US6193019B1 (en) * 1998-04-03 2001-02-27 Otis Elevator Company Device for localization of a door breakdown

Also Published As

Publication number Publication date
BR7203809D0 (pt) 1974-04-18

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