EP2623452B1 - Elevator operation mode switching system - Google Patents

Elevator operation mode switching system Download PDF

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Publication number
EP2623452B1
EP2623452B1 EP10857873.3A EP10857873A EP2623452B1 EP 2623452 B1 EP2623452 B1 EP 2623452B1 EP 10857873 A EP10857873 A EP 10857873A EP 2623452 B1 EP2623452 B1 EP 2623452B1
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EP
European Patent Office
Prior art keywords
maintenance
landing
car
mode
relay
Prior art date
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Application number
EP10857873.3A
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German (de)
French (fr)
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EP2623452A1 (en
EP2623452A4 (en
Inventor
Takehiko Kubota
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2010/067226 priority Critical patent/WO2012042660A1/en
Publication of EP2623452A1 publication Critical patent/EP2623452A1/en
Publication of EP2623452A4 publication Critical patent/EP2623452A4/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0087Devices facilitating maintenance, repair or inspection tasks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/02Door or gate operation
    • B66B13/14Control systems or devices
    • B66B13/16Door or gate locking devices controlled or primarily controlled by condition of cage, e.g. movement or position
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0043Devices enhancing safety during maintenance
    • B66B5/005Safety of maintenance personnel

Description

    Technical Field
  • The present invention relates to an operation-mode switching system for an elevator, which is configured to switch an operation mode at the time of maintenance work.
  • Background Art
  • Machine room-less type elevators without a machine room, which include a hoisting machine and a controller provided in a hoistway, have become the mainstream of elevators of recent years . Therefore, at the time of maintenance of elevator equipment, a maintenance person more frequently enters the hoistway to perform maintenance work.
  • For example, when the hoisting machine and the controller are provided in an upper part of the hoistway, the maintenance person performs the maintenance work for the hoisting machine and the controller on the top of a car. Moreover, for the maintenance of a landing-door device, various types of switches provided in the hoistway, and the like, the maintenance person also performs the maintenance work on the top of the car. Further, when the hoisting machine and the controller are provided in a lower part of the hoistway, the maintenance person enters a pit of the hoistway to perform the maintenance work for the hoisting machine and the controller.
  • In order to ensure a space for the evacuation of the maintenance person at the time of maintenance work as described above, final limit switches are provided in the upper part and the lower part of the hoistway so that the car is prevented from moving beyond the final limit switches when a maintenance operation is performed. Before the maintenance person enters the pit, a switch provided to a landing or the like is previously operated so that the car does not operate. Then, the maintenance person enters the pit.
  • Further, with a conventional controller for an elevator, when an unlocking device for a landing door is operated, an operation mode is automatically switched from a normal-operation mode to a maintenance-operation mode (for example, see Patent Literature 1) .
  • Citation List Patent Literature
  • [PTL 1] JP 2007-276896 A
  • Summary of Invention Technical Problems
  • In the conventional elevators as described above, when the maintenance person enters the pit, the operation mode is required to be previously switched to the maintenance-operation mode outside of the hoistway. Therefore, a selector switch provided to a landing on a bottom floor or the like is to be operated. In practice, however, the maintenance person can enter the pit even without operating the selector switch. Therefore, there is a possibility that the maintenance person carelessly enters the pit while the normal-operation mode is maintained.
  • On the other hand, with the conventional controller for the elevator described in Patent Literature 1, the operation mode is automatically switched to the maintenance-operation mode . However, the controller becomes complex, and hence there is a fear in that equipment cost disadvantageously increases.
  • The present invention has been made to solve the problems described above, and therefore has an object to provide an operation-mode switching system for an elevator, which can more reliably prevent, with a simple configuration, a maintenance person to enter a hoistway while a normal-operation mode is maintained.
  • Solution to Problems
  • According to the present invention, there is provided an operation-mode switching system for an elevator, which is provided to an elevator including a plurality of landing-door switches for detecting an open state of a plurality of landing doors, and switches an operation mode during maintenance work, the operation-mode switching system for an elevator including: a maintenance-operation mode selector switch provided in a hoistway, for switching the operation mode to a maintenance-operation mode; a landing-door opening detection switch provided to the landing door independently of the landing-door switches, the landing-door opening detection switch being turned OFF when the landing door is intentionally opened; and relay for inhibiting normal operation during maintenance, which is demagnetized when the landing-door opening detection switch is turned OFF to inhibit start of a car, in which a maintenance operation of the car is enabled by switching the operation mode to the maintenance-operation mode through the maintenance-operation mode selector switch after the start of the car is inhibited by the relay for inhibiting normal operation during maintenance.
  • Further, according to a non-claimed embodiment, there is provided an operation-mode switching system for an elevator, which is provided to an elevator including a plurality of landing-door switches for detecting an open state of a plurality of landing doors and a car gate switch for detecting an open state of a car door, and switches an operation mode during maintenance work, the operation-mode switching system for an elevator including: a maintenance-operation mode selector switch provided in a hoistway, for switching the operation mode to a maintenance-operation mode; a relay for inhibiting normal operation during maintenance, which is demagnetized to inhibit start of a car; and a determination unit for determining intentional opening of the landing door while the car door remains closed based on consistency between the landing-door switches and the car gate switch to demagnetize the relay for inhibiting normal operation during maintenance, in which a maintenance operation of the car is enabled by switching the operation mode to the maintenance-operation mode through the maintenance-operation mode selector switch after the start of the car is inhibited by the relay for inhibiting normal operation during maintenance.
  • Advantageous Effects of Invention
  • With the operation-mode switching system for the elevator according to the present invention, when the landing doors are intentionally opened, the relay for inhibiting normal operation during maintenance is demagnetized to temporarily prevent the car from being started. Thereafter, by switching the operation mode to the maintenance-operation mode through the maintenance-operation mode selector switch, the maintenance operation of the car is enabled. Therefore, with the simple configuration, the maintenance person can be more reliably prevented from entering the hoistway while the normal-operation mode is maintained.
  • Brief Description of Drawings
    • FIG. 1 is a configuration diagram illustrating a machine room- less type elevator according to a first embodiment of the present invention.
    • FIG. 2 is a front view illustrating landing doors illustrated in FIG. 1.
    • FIG. 3 is a back view illustrating a principal part of the landing doors 5 illustrated in FIG. 2 in an enlarged manner.
    • FIG. 4 is a circuit diagram illustrating an operation-mode switching system for the elevator illustrated in FIG. 1.
    • FIG. 5 is a circuit diagram illustrating an operation-mode switching system for an elevator according to a second embodiment of the present invention.
    • FIG. 6 is a circuit diagram illustrating an operation-mode switching system for an elevator according to a third embodiment of the present invention.
    Description of Embodiments
  • In the following, modes for carrying out the present invention are described referring to the drawings.
  • First Embodiment
  • FIG. 1 is a configuration diagram illustrating a machine room- less type elevator according to a first embodiment of the present invention. In FIG. 1, a hoisting machine 2 is provided in a lower part of a hoistway 1. The hoisting machine 2 includes a driving sheave, a hoisting-machine motor for rotating the driving sheave, and a hoisting-machine brake for braking the rotation of the driving sheave. Suspension means (not shown) is wound around the driving sheave. As the suspension means, a plurality of ropes or a plurality of belts are used.
  • A car 3 and a counterweight (not shown) are suspended in the hoistway 1 by the suspension means and are raised and lowered by the hoisting machine 2. In a lower part of the hoistway 1, an elevator controller (control board) 4 for controlling the hoisting machine 2 is provided. An operation of the car 3 is controlled by the elevator controller 4.
  • A landing doorway on each floor is opened and closed by a pair (FIG. 2) of landing doors 5. Landing-door switches 6 for detecting an open state of the landing doors 5 are provided to the landing doors 5 on each floor.
  • A bottom-floor landing-door opening detection switch 7 is provided to the landing doors 5 on the bottom floor, independently of the landing-door switch 6. The bottom-floor landing-door opening detection switch 7 is provided only to the landing door 5 on the bottom floor and detect that the landing doors 5 on the bottom floor are intentionally opened.
  • General-floor landing-door opening detection switches 8 are provided to the landing doors 5 on each of the floors other than the bottom floor, independently of the landing-door switches 6. The general-floor landing-door opening detection switches 8 detect that the landing doors 5 on the floors other than the bottom floor are intentionally opened.
  • In a pit 1a corresponding to a lowermost part of the hoistway 1, an in-pit maintenance-operation mode selector switch 9 for switching an operation mode to a maintenance-operation mode and an in-pit maintenance-operation device 10 for operating the car 3 in the maintenance-operation mode are provided. The in-pit maintenance-operation mode selector switch 9 and the in-pit maintenance-operation device 10 are provided in proximity to each other and are electrically connected to the elevator controller 4.
  • A first reset switch 11 for resetting the switching of the operation mode so as to return the operation mode to the normal-operation mode is provided to the landing on the bottom floor. A second reset switch 12 for resetting the switching of the operation mode to return the operation mode to the normal-operation mode is provided to the landing on a predetermined floor (for example, a second floor) other than the bottom floor. The reset switches 11 and 12 are electrically connected to the elevator controller 4.
  • A car doorway is closed and opened by car doors 13. During a normal operation, when the car 3 arrives at a floor, the landing doors 5 on the floor are opened and closed interlockingly with the car doors 13.
  • On the top of the car 3, a door operator 14 for controlling the opening and closing of the car doors 13 is provided. The door operator 14 includes an on-car maintenance-operation mode selector switch 15 for switching the operation mode to the maintenance-operation mode and an on-car maintenance-operation device 16 for operating the car 3 in the maintenance-operation mode. The on-car maintenance-operation mode selector switch 15 and the on-car maintenance-operation device 16 are provided in proximity to each other and are electrically connected to the elevator controller 4.
  • As described above, the in-pit maintenance-operation mode selector switch 9, the in-pit maintenance-operation device 10, the on-car maintenance-operation mode selector switch 15, and the on-car maintenance-operation device 16 are all provided in the hoistway 1. Therefore, in order to operate the above-mentioned switches and devices, a maintenance person is required to intentionally open the landing doors 5 to enter the hoistway 1.
  • A car gate switch 17 for detecting an open state of the car doors 13 is provided to the car door 13. In the lower part of the hoistway 1, a maintenance-operation lower limit switch 18 for limiting the lowering of the car 3 during the maintenance operation is provided. In the upper part of the hoistway 1, a maintenance-operation upper limit switch 19 for limiting the raising of the car 3 during the maintenance operation is provided. A cam 20 for operating the limit switches 18 and 19 is provided to the car 3.
  • FIG. 2 is a front view illustrating the landing doors 5 illustrated in FIG. 1, and FIG. 3 is a back view (as viewed from the interior of the hoistway 1) illustrating a principal part of the landing doors 5 illustrated in FIG. 2 in an enlarged manner. A hook 21 is fixed above the landing doorway. A hook portion 21a is provided to one end of the hook 21. A latch 22 is pivotably mounted to upper parts of the landing door 5. An engagement portion 22a is provided to a distal end of the latch 22. When the landing door 5 is in a fully closed state, the engagement portion 22a comes into engagement with the hook portion 21a to inhibit the movement of the landing door 5 in a door-opening direction.
  • When the car doors 13 perform a door-opening operation after the car 3 lands, an engagement device (not shown) provided on the car 3 side come into engagement with the latch 22 to pivot the latch 22, thereby releasing an engaged state of the latch 22 and the hook 21. As a result, the door-opening operation of the landing doors 5 is enabled. Moreover, when the landing doors 5 perform a door-closing operation, the latch 22 is returned to position at which the latch 22 comes into engagement with the hook 21.
  • The landing-door switch 6 is provided in the vicinity of the hook 21 above the landing doorway and is operated by the pivoting of the latch 22. An interlock device 23 includes the hook 21, the latch 22, and the landing-door switch 6.
  • On the other hand, the landing-door opening detection switches 7 and 8 are provided on back surfaces of the landing doors 5. On the back surfaces of the landing doors 5, unlocking members 24 for manually unlocking the interlock devices 23 are pivotably mounted. Unlock key holes 5a, into which an unlock key (not shown) for pivoting the unlocking members 24 is inserted, are provided to the landing doors 5, respectively.
  • Each of the unlocking members 24 is connected to the latch 22 through a connection wire 25 and a connection plate 26. The maintenance person uses the unlock key to pivot the unlocking member 24 in a clockwise direction in FIG. 3 during the maintenance work. As a result, an end of each of the latches 22, which is on the side opposite to the engagement portion 22a, is pulled down to pivot the latch 22 in the clockwise direction in FIG. 3. In this manner, the engaged state between the latch 22 and the hook 21 is manually released.
  • Each of the landing-door opening detection switches 7 and 8 is provided in the vicinity of the unlocking member 24 and is operated by the pivoting of the unlocking member 24. Even if the latch 22 is pivoted by the engagement device on the car 3 side during the normal operation, the pivoting is not transmitted to the unlocking member 24. Therefore, each of the landing-door opening detection switches 7 and 8 detects only the intentional opening of the corresponding landing door 5.
  • FIG. 4 is a circuit diagram illustrating an operation-mode switching system for the elevator illustrated in FIG. 1. First to fourth reset relays 31, 32, 33, and 34 (PRSTA, CRSTA, PRSTB, and CRSTB) are connected in parallel to each other. The first reset relay 31 and the third reset relay 33 are relays for resetting a normal-operation inhibited state while the maintenance is performed in the pit 1a. The second reset relay 32 and the fourth reset relay 34 are relays for resetting the normal-operation inhibited state while the maintenance is performed on the top of the car 3.
  • The first reset relay 31 is connected in series to the first reset switch 11 to interlock with the first reset switch 11. The second reset relay 32 is connected in series to the second reset switch 12 to interlock with the second reset switch 12.
  • The third reset relay 33 and the fourth reset relay 34 are relays for verifying that all the landing doors 5 are closed.
  • A relay 35 (INSC) for inhibiting normal operation during maintenance on car and a relay 36 (INSP) for inhibiting normal operation during maintenance in pit are connected in parallel to a battery 37.
  • In FIG. 4, the reference symbols denoting the contacts correspond in the following manner:
    • PRSTA: relay contact of the first reset relay 31;
    • CRSTA: relay contact of the second reset relay 32;
    • PRSTB: relay contact of the third reset relay 33;
    • CRSTB: relay contact of the fourth reset relay 34;
    • INSC: relay contact of the relay 35 for inhibiting normal operation during maintenance on car;
    • INSP: relay contact of the relay 36 for inhibiting normal operation during maintenance in pit;
    • HLS-T: normally-closed contact of the general-floor landing-door opening detection switch 8 on the top floor;
    • HLS-M: normally-closed contacts of the general-floor landing-door opening detection switches 8 on intermediate floors (only one thereof is illustrated in FIG. 4 for simplification);
    • HLS-B: normally-closed contact of the bottom-floor landing-door opening detection switch 7;
    • DS-T: contact of the landing-door switch 6 on the top floor;
    • DS-M: contacts of the landing-door switches 6 on the intermediate floors (only one thereof is illustrated in FIG. 4 for simplification);
    • DS-B: contact of the landing-door switch 6 on the bottom floor;
    • GS: contact of the car gate switch 17;
    • TLS: contact of the maintenance-operation upper limit switch 19; and
    • BLS: contact of the maintenance-operation lower limit switch 18.
  • Therelay 35 for inhibiting normal operation during maintenance on car is connected in series to the normally-closed contacts of the general-floor landing-door opening detection switches 8. Therefore, the relay 35 for inhibiting normal operation during maintenance on car is released when the landing doors 5 on any one of the floors other than the bottom floor are intentionally opened. When the relay 35 for inhibiting normal operation during maintenance on car is demagnetized, the start of the car 3 is inhibited. Moreover, the relay 35 for inhibiting normal operation during maintenance on car can be turned ON only when the relay contacts of the second reset relay 32 and the fourth reset relay 34 are closed.
  • The relay 36 for inhibiting normal operation during maintenance in pit is connected in series to the normally-closed contact of the bottom-floor landing-door opening detection switch 7. Therefore, the relay 36 for inhibiting normal operation during maintenance in pit is released when the landing doors 5 on the bottom floor are intentionally opened. When the relay 36 for inhibiting normal operation during maintenance in pit is demagnetized, the start of the car 3 is inhibited. Moreover, the relay 36 for inhibiting normal operation during maintenance in pit can be turned ON only when the relay contacts of the first reset relay 31 and the third reset relay 33 are closed.
  • When the first reset switch 11 is turned ON under a state in which the in-pit maintenance-operation mode selector switch 9 and the on-car maintenance-operation mode selector switch 15 are both turned to a normal-operation (AUTO) side, the first reset relay 31 is excited.
  • Further, when the second reset switch 12 is turned ON under a state in which the in-pit maintenance-operation mode selector switch 9 and the on-car maintenance-operation mode selector switch 15 are both turned to the normal-operation (AUTO) side, the second reset relay 32 is excited.
  • The contacts of all the landing-door switches 6 are connected in series. The fourth reset relay 34 is connected in series to the contacts of the landing-door switches 6. When the second reset relay 32 is excited and all the contacts of the landing-door switches 6 are closed, that is, all the landing doors 5 are closed, the fourth reset relay 34 is excited. However, the fourth reset relay 34 is configured so as not to be excited if the first reset switch 11 on the bottom floor is turned ON at this time.
  • The third reset relay 33 is connected in series to the contacts of the landing-door switches 6. When the first reset relay 31 is excited and all the contacts of the landing-door switches 6 are closed, that is, all the landing doors 5 are closed, the third reset relay 33 is excited. However, the third reset relay 33 is configured so as not to be excited if the second reset switch 12 is turned ON at this time.
  • Therefore, the relays 35 and 36 for inhibiting normal operation during maintenance are excited only when the reset switches 11 and 12 are turned ON in the landing in the case where all the landing doors 5 are closed and the operation mode is not the maintenance-operation mode. Once excited, the relays 35 and 36 for inhibiting normal operation during maintenance are configured so as to keep the excited state by their own contacts and are always excited as long as the landing doors 5 are not intentionally opened.
  • A circuit including the landing-door opening detection switches 7 and 8 and the relays 35 and 36 for inhibiting normal operation during maintenance is configured so that a power source is backed up by the battery 37 in a case of electric outage and power shutdown. Therefore, when the relays recover from the electric outage after the relays 35 and 36 are interrupted in a case of occurrence of electric outage, the elevator can be prevented from being kept in a state where the start is inhibited.
  • Next, a switching operation of the operation mode at the time of maintenance work is described. First, the maintenance work performed in the pit 1a is described. When the maintenance person intentionally opens the landing doors 5 on the bottom floor for the maintenance work in the pit 1a, the normally-closed contact (HLS-B) of the bottom-floor landing-door opening detection switch 7 is opened to release the relay 36 for inhibiting normal operation during maintenance in pit. As a result, the normally-open contact (INSP) connected to the normal-operation (AUTO) side of the in-pit maintenance-operation mode selector switch 9 is opened. Therefore, power feeding to the elevator controller 4 is stopped to inhibit the car 3 from being started.
  • Thereafter, the maintenance person turns the in-pit maintenance-operation mode selector switch 9 to a maintenance-operation mode (HAND) side. Then, power is fed to the elevator controller 4 only when any one of operation switches (UP, DN) of the in-pit maintenance-operation device 10 is operated. As a result, the maintenance operation of the car 3 is enabled.
  • Each of the operation switches (UP, DN) of the in-pit maintenance-operation device 10 includes two systems of contacts. One of the systems is connected to a feeder of the elevator controller 4, whereas the other system is connected to an up-operation command signal and a down-operation command signal to the elevator controller 4.
  • When the cam 20 comes into contact with the maintenance-operation lower limit switch 18, the contact (BLS) is opened to interrupt the circuit of the DN-side operation switch of the in-pit maintenance-operation device 10, thereby restricting the lowering of the car 3 from the position.
  • When the maintenance work is completed, the maintenance person returns the in-pit maintenance-operation mode selector switch 9 to the normal-operation (AUTO) side and then moves from the interior of the pit 1a to the landing on the bottom floor. Then, in a state in which all the landing doors 5 and the car doors 13 are closed, the first reset switch 11 is operated. As a result, the operation mode is returned to the normal-operation mode.
  • Next, the maintenance work performed on the top of the car 3 is described. When the maintenance person intentionally opens the landing doors 5 on one of the floor other than the bottom floor to get on the top of the car 3, the normally-closed contact (HLS-T or HLS-M) of the general-floor landing-door opening detection switch 8 on the corresponding floor is opened to release the relay 35 for inhibiting normal operation during maintenance on car. As a result, the normally-open contact (INSC) connected to the normal operation (AUTO) side of the on-car maintenance-operation mode selector switch 15 is opened. Therefore, the power feeding to the elevator controller 4 is stopped to inhibit the car 3 from being started.
  • Thereafter, the maintenance person turns the on-car maintenance-operation mode selector switch 15 to the maintenance-operation mode (HAND) side. Then, power is fed to the elevator controller 4 only when any one of operation switches (UP, DN) of the on-car maintenance-operation device 16 is operated. As a result, the maintenance operation of the car 3 is enabled.
  • Each of the operation switches (UP, DN) of the on-car maintenance-operation device 16 includes two systems of contacts. One of the systems is connected to the feeder of the elevator controller 4, whereas the other system is connected to the up-operation command signal and the down-operation command signal to the elevator controller 4.
  • When the cam 20 comes into contact with the maintenance-operation upper limit switch 19, the contact (TLS) is opened to interrupt the circuit of the UP-side operation switch of the on-car maintenance-operation device 16, thereby restricting the raising of the car 3 from the position.
  • When the maintenance work is completed, the maintenance person returns the on-car maintenance-operation mode selector switch 15 to the normal-operation (AUTO) side and then moves from the top of the car to the landing. Then, in a state in which all the landing doors 5 and the car doors 13 are closed, the second reset switch 12 is operated. As a result, the operation mode is returned to the normal-operation mode.
  • According to the operation-mode switching system for the elevator as described above, the maintenance person can be more reliably prevented from entering the hoistway 1 while the normal-operation mode is maintained, with a simple configuration.
  • Next, the case where the maintenance work is performed simultaneously in the pit 1a and on the top of the car 3 is described. When the maintenance person working in the pit 1a intentionally opens the landing doors 5 on the bottom floor, the normally-closed contact (HLS-B) of the bottom-floor landing-door opening detection switch 7 is opened to release the relay 36 for inhibiting normal operation during maintenance in pit. As a result, the normally-open contact (INSP) connected to the normal-operation (AUTO) side of the in-pit maintenance-operation mode selector switch 9 is opened.
  • When the maintenance person working on the top of the car 3 intentionally opens the landing doors 5 on one of the floor other than the bottom floor, the normally-closed contact (HLS-T or HLS-M) of the general-floor landing-door opening detection switch 8 on the corresponding floor is intentionally opened to release the relay 35 for inhibiting normal operation during maintenance on car. As a result, the normally-open contact (INSC) connected to the normal-operation (AUTO) side of the on-car maintenance-operation mode selector switch 15 is opened.
  • As described above, when the maintenance person enters the pit 1a and another maintenance person gets on the top of the car 3, the power feeding to the elevator controller 4 is doubly interrupted. It is apparent that the start of the car 3 is inhibited thereby.
  • In the above-mentioned state, even if the maintenance person present in the pit 1a switches the in-pit maintenance-operation mode selector switch 9 to the maintenance-operation mode (HAND) side, the contact (INSC) is opened, and therefore the car 3 cannot be operated even in the maintenance-operation mode. Then, only when the operation switches of both the maintenance-operation device 10 provided in the pit 1a and the maintenance-operation device 16 provided on the top of the car 3 are simultaneously operated in the same direction after the maintenance person present on the top of the car 3 turns the on-car maintenance-operation selector switch 15 to the maintenance-operation mode (HAND) side, the power is fed to the elevator controller 4 to enable the maintenance operation of the car 3. Thus, the car 3 does not move in a state which is not expected by the maintenance person.
  • Second Embodiment
  • Next, FIG. 5 is a circuit diagram illustrating an operation-mode switching system for an elevator according to a second embodiment of the present invention. In the second embodiment, the reset circuit for the relay 35 for inhibiting normal operation during maintenance on car and the reset circuit for the relay 36 for inhibiting normal operation during maintenance in pit are the same circuit.
  • Specifically, a circuit in which the first reset switch 11 and the second reset switch 12 are connected in parallel is connected in series to a first reset relay 38 which is common to the switches. The first reset relay 38 is a relay for resetting a normal-operation inhibited state during the maintenance and interlocks with the first reset switch 11 and the second reset switch 12.
  • The second reset relay 39 is a relay for verifying that all the landing doors 5 are closed. The remaining configuration is similar or identical to that of the first embodiment.
  • In FIG. 5, the reference symbols denoting the contacts correspond in the following manner:
    • RSTA: relay contact of the first reset relay 38; and
    • RSTB: relay contact of the second reset relay 39.
  • In the operation-mode switching system for the elevator as described above, the reset circuit for the relay 35 for inhibiting normal operation during maintenance on car and the reset circuit for the relay 36 for inhibiting normal operation during maintenance in pit are the same circuit. Therefore, the configuration is simple . By operating any one of the reset switches 11 and 12, the elevator can recover from a state in which the start is disabled.
  • The landing-door opening detection switches 7 and 8 are not required to be provided to all the floors. For example, when the maintenance work is performed only in the pit 1a and the movement to the pit 1a is always made by opening the landing doors 5 on the bottom floor, a method of providing only the bottom-floor landing-door opening detection switch 7 is available. In this case, the relay and the switches concerning the maintenance work performed on the top of the car 3 are omitted. On the other hand, when the maintenance work is performed only on the top of the car 3, the bottom-floor landing-door opening detection switch 7 can be omitted. Moreover, a method of limiting the movement to the top of the car 3 only from a specific floor and providing the general-floor landing-door opening detection switch 8 only to the specific floor is also available.
  • Third Embodiment
  • Next, FIG. 6 is a circuit diagram illustrating an operation-mode switching system for an elevator according to a third embodiment of the present invention. In the third embodiment, an operation circuit for the relay 35 for inhibiting normal operation during maintenance on car and the relay 36 for inhibiting normal operation during maintenance in pit is configured by a microcomputer (determination unit) 41.
  • A gate switch relay 42 is turned ON and OFF by the microcomputer 41 in accordance with opening and closing of the car gate switch 17. A landing-door switch relay 43 is turned ON and OFF by the microcomputer 41 in accordance with the opening and closing of the landing-door switch 6. A normally-open contact (GSR) of the gate switch relay 42 and a normally-open contact (DSR) of the landing-door switch relay 43 are connected in series to the feeder of the elevator controller 4.
  • In the first and second embodiments, the intentional opening of the landing doors 5 is detected by using the landing-door opening detection switches 7 and 8. On the other hand, in the third embodiment, the relays 35 and 36 for inhibiting normal operation during maintenance are operated by the microcomputer 41. Therefore, the intentional opening of only the landing doors 5 is determined based on the consistency between the landing-door switches 6 and the car gate switch 17 to interrupt the relays 35 and 36 for inhibiting normal operation during maintenance.
  • Specifically, when it is detected that the landing-door switch 6 on the bottom floor is opened although the car gate switch 17 is in a closed state, the relay 36 for inhibiting normal operation during maintenance in pit is interrupted. Moreover, when it is detected that the landing-door switch 6 on one of the floor other than the bottom floor is opened although the car gate switch 17 is in a closed state, the relay 35 for inhibiting normal operation during maintenance on car is interrupted.
  • Further, the relays 35 and 36 for inhibiting normal operation during maintenance are reset when a reset switch signal is input in a state in which all the doors 5 and 13 are closed. Further, the circuit including the microcomputer 41 and the relays 35 and 36 for inhibiting normal operation during maintenance is configured so that the power source is backed up by the battery 37 in a case of electric outage or power shutdown. The remaining configuration is similar or identical to that of the first embodiment.
  • Even by the operation-mode switching system for the elevator described above, the maintenance person can be more reliably prevented, with a simple configuration, from entering the hoistway 1 while the normal-operation mode is maintained. Moreover, even when the maintenance work is performed simultaneously in the pit 1a and on the top of the car 3, the car 3 does not move in a state which is not expected by the maintenance person.
  • In the examples described above, in the case where the maintenance work is performed simultaneously in the pit 1a and on the top of the car 3, the maintenance operation of the car 3 is enabled as long as the operations are performed simultaneously in the same direction. However, none of the operation of the in-pit maintenance-operation device 10 and the operation of the on-car maintenance-operation device 16 may be accepted when the start of the car 3 is inhibited by both the relay 35 for inhibiting normal operation during maintenance on car and the relay 36 for inhibiting normal operation during maintenance in pit.
  • Further, although the machine room-less type elevator has been described in the examples described above, the present invention is applicable to an elevator with a machine room as long as the maintenance work is performed in the hoistway for the elevator.

Claims (7)

  1. An operation-mode switching system for an elevator, which is provided to an elevator including a plurality of landing-door switches (6) for detecting an open state of a plurality of landing doors (5), and which switches an operation mode during maintenance work, the operation-mode switching system for an elevator comprising:
    a maintenance-operation mode selector switch (9, 15) provided in a hoistway (1), for switching the operation mode to a maintenance-operation mode;
    a landing-door opening detection switch (7, 8) provided to the landing door (5) independently of the landing-door switches (6), the landing-door opening detection switch (7, 8) being turned OFF when the landing door (5) is intentionally opened; and
    a relay (35, 36) for inhibiting normal operation during maintenance, which is demagnetized when the landing-door opening detection switch (7, 8) is turned OFF to inhibit start of a car (3),
    wherein a maintenance operation of the car (3) is enabled by switching the operation mode to the maintenance-operation mode through the maintenance-operation mode selector switch (9, 15) after the start of the car (3) is inhibited by the relay (35, 36) for inhibiting normal operation during maintenance.
  2. An operation-mode switching system for an elevator according to claim 1, further comprising a maintenance-operation device (10, 16) for manually operating the car (3) during the maintenance work, the maintenance-operation device (10, 16) being provided in the hoistway (1) in proximity to the maintenance-operation mode selector switch (9, 15).
  3. An operation-mode switching system for an elevator according to claim 1, further comprising a reset switch (11, 12) provided to a landing, for returning the operation mode to a normal-operation mode,
    wherein when the maintenance-operation mode selector switch (9, 15) is returned to the normal-operation mode side and the reset switch (11, 12) is operated in a state in which closure of all the plurality of landing doors (5) is detected based on states of the plurality of landing-door switches (6), the car (3) is operable in the normal-operation mode.
  4. An operation-mode switching system for an elevator according to claim 1, wherein:
    the maintenance-operation mode selector switch (9) is provided in a pit of the hoistway (1); and
    the landing-door opening detection switch (7) is provided to the landing door (5) on a bottom floor.
  5. An operation-mode switching system for an elevator according to claim 1, wherein:
    the maintenance-operation mode selector switch (15) is provided on top of the car (3); and
    the landing-door opening detection switch (8) is provided to the landing door (5) on a floor other than a bottom floor.
  6. An operation-mode switching system for an elevator according to claim 2, wherein:
    the maintenance-operation mode selector switch (9, 15) comprises:
    an in-pit maintenance-operation mode selector switch (9) provided in a pit of the hoistway (1); and
    an on-car maintenance-operation mode selector switch (15) provided on top of the car (3);
    the maintenance-operation device (10, 16) comprises:
    an in-pit maintenance-operation device (10) provided in the pit; and
    an on-car maintenance-operation device (16) provided on the top of the car (3);
    the landing-door opening detection switch (7, 8) comprises:
    a bottom-floor landing-door opening detection switch (7) provided to the landing door (5) on a bottom floor; and
    a general-floor landing-door opening detection switch (8) provided to the landing door (5) on a floor other than the bottom floor;
    the relay (35, 36) for inhibiting normal operation during maintenance comprises:
    a relay (36) for inhibiting normal operation during maintenance in pit, which corresponds to the bottom-floor landing-door opening detection switch (7); and
    a relay (35) for inhibiting normal operation during maintenance on car, which corresponds to the general-floor landing-door opening detection switch (8); and
    the maintenance operation of the car (3) is enabled only when the in-pit maintenance-operation device (10) and the on-car maintenance-operation device (16) are operated simultaneously in the same direction in a case where the start of the car (3) is inhibited by both the relay (36) for inhibiting normal operation during maintenance in pit and the relay (35) for inhibiting normal operation during maintenance on car.
  7. An operation-mode switching system for an elevator according to claim 1, wherein a circuit including the landing-door opening detection switch (7, 8) and the relay (35, 36) for inhibiting normal operation during maintenance is configured so that a power source is backed up by a battery (37) in a case of electric outage and power shutdown.
EP10857873.3A 2010-10-01 2010-10-01 Elevator operation mode switching system Active EP2623452B1 (en)

Priority Applications (1)

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PCT/JP2010/067226 WO2012042660A1 (en) 2010-10-01 2010-10-01 Elevator operation mode switching system

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EP2623452A4 EP2623452A4 (en) 2018-03-14
EP2623452B1 true EP2623452B1 (en) 2019-11-20

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KR (1) KR101452668B1 (en)
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CA2969292A1 (en) * 2014-12-18 2016-06-23 Inventio Ag Method for operating an electronic safety system with temporary subscribers
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KR102166938B1 (en) * 2016-04-26 2020-10-16 미쓰비시덴키 가부시키가이샤 Elevator inspection operation device
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US10457522B2 (en) 2016-06-30 2019-10-29 Otis Elevator Company Limit switch system including first limit device and second limit device
CN106395518B (en) * 2016-11-11 2019-04-26 西继迅达(许昌)电梯有限公司 For controlling the elevator motion control plate of apparatus for examination and repair priority
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CN103068710B (en) 2015-07-22
KR20130085417A (en) 2013-07-29
EP2623452A1 (en) 2013-08-07
JPWO2012042660A1 (en) 2014-02-03
WO2012042660A1 (en) 2012-04-05
JP5452726B2 (en) 2014-03-26
CN103068710A (en) 2013-04-24
KR101452668B1 (en) 2014-10-22
EP2623452A4 (en) 2018-03-14

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