US3469657A - Automatic emergency relevelling device for lifts - Google Patents

Automatic emergency relevelling device for lifts Download PDF

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Publication number
US3469657A
US3469657A US636951A US3469657DA US3469657A US 3469657 A US3469657 A US 3469657A US 636951 A US636951 A US 636951A US 3469657D A US3469657D A US 3469657DA US 3469657 A US3469657 A US 3469657A
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car
emergency
motor
relay
lever
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US636951A
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English (en)
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Salvatore Sgroi
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/027—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions to permit passengers to leave an elevator car in case of failure, e.g. moving the car to a reference floor or unlocking the door

Definitions

  • the invention aims at dispensing with the need for providing a high power motor or large counterweight system for bringing up or down to a landing a lift car which has stopped between landings for untoward reasons.
  • the invention relies on the use of a low power motor to displace the lift car either up or down in dependence upon the power capabilities of the motor.
  • a reversing relay arrangement is provided to ensure that if this low power motor cannot displace the lift in one direction the power supply to the motor will be reversed and it will displace the lift car in the other and easier direction.
  • the invention relates to automatic emergency re-levelling devices for lifts, by which term it is intended to embrace all types of passenger and freight lifts and elevators, such devices being used to dispatch a lift car to the nearest landing in the case of accidental stoppage between two landings. Such stoppages may of course occur as a result of mains failure, faults in the lift circuits, or localised damage.
  • Emergency devices of the abovementioned type are known which are based on the use of an auxiliary, preferably direct current, electric motor which can be fed from storage batteries to operate the winch of the lift hoisting gear in order to move the car to the nearest landing door when it stops at a position removed from any floor.
  • known devices of this kind may be relatively simple in construction and relatively easy to install, they are objectionable in that they require at least one auxiliary electric motor and feed storage battery of power capable of handling a fully loaded lift.
  • a still further object of the invention is to provide a device of the general abovementioned type which requires an auxiliary electric motor of only relatively low power, which power is independent of the capacity of the lift. It is an associated object to meet these requirements while dispensing with the use of a counterweight of size commensurate with the capacity of the lift.
  • an emergency car operating circuit comprises an emergency car control means of relatively low power arranged to operate a winch for effecting vertical movements of the car, the said means being arranged to be automatically actuated as a result of accidental stoppage of the car between two landings and to effect re-levelling of the car to one of the said two landings by displacing the car in a direction which results in power requirements within the capabilities of the said low power means.
  • the power of the means is such that the car is displaced in a direction either up or down in dependence upon whichever requires the least effort.
  • the emergency control means comprises a direct current electric motor fed from a storage battery and the emergency operating circuit includes an electromagnet adapted to effect opening of a brake for the winch, first means being provided for maintaining the said emergency circuit open during normal operation of the lift by a normal operating circuit and for automatically closing it in the event of an emergency due to stoppage of the car between two landings, and further means provided for permitting operation of the motor on closure of the emergency circuit in that sense of rotation which results in displacement of the car in the said direction.
  • FIG. 1 is a circuit and schematic diagram showing an emergency device according to the invention in its inoperative position
  • FIG. 2 is a similar diagram to that of FIG. 1 showing the device thereof dun'ng operation;
  • FIG. 3 is a perspective view of both the normal and auxiliary or emergency control means for the lift car.
  • a passenger or freight lift car 8 is normally controlled by a winch 35 operable in a known manner by an electric motor 36.
  • a brake 37 is also shown which is urged into a closed or on position by spring means 38 but which may be opened or released" by an electromagnet 39.
  • a counterweight 5 for the car 8 is also shown but no details are given herein of the operation of this well-known normal control means.
  • a rope 3 is wound on a pulley 2 which is freely rotatable on a pivot 1, one of the rope ends being connected to the counterweight 5 via a spring 4 and the other end to the lift car 8 via a spring 9.
  • a plurality of cam means 10 are attached to the rope 3 in a predetermined spaced relationship and are so distributed therealong that a said means 10 is arranged on a predetermined portion of the pulley 2 whenever the car 8 is at any of the lift landings.
  • a level is fulcrumed at 12 to a fixed pivot and has a curved front arm 11a which is adapted to overlie a porton of the pulley 2 corresponding in the drawings to the top right quadrant thereof.
  • the other or rear arm 11b of the lever 11 carriers two different operative positions of the lever with two sets of contacts 13a, 14a, to which contacts are connected an emergency operating circuit and the normal operating circuit of the lift, respectively.
  • the latter circuit of course includes the aforementioned normal control means and the lever arrangement is such that in one position of the arm lla'the bridge 13 closes the contacts 13a while in another position thereof the bridge 14 closes the contacts 14a.
  • the rear arm 11b of the lever 11 is biased by a spring 15 to urge the curved arm 11a towards and against the pulley 2, an electromagnet is itsef under the control of the normal operating circuits of the lift in a manner referred to in greater detail hereinbelow and is associated with a delay device 17.
  • the cam means 10 leaves that pulley portion which is associated with the lever 11.
  • the lever 11 remains in the position shown in FIG. 1 as a result of the action of the electromagnet 16 which has been energised through a parallel connection thereof with the circuit of the main fail-safe brake of the lifting winch.
  • the emergency circuit comprises a storage battery 18 arranged to be buffer loaded and charged by an apparatus 19 and an electromagnet 20 arranged to effect opening of the brake 37 (FIG. 3).
  • the circuit further comprises a direct current electric motor 25, of which latter motor the energising circuit brushes and the field windings are denoted 26a, 26, respectively.
  • the brushes 26a are connected to two leads 23, 24 of the emergency circuit, the field windings 26 being connected to the same said leads via a reversing relay 27.
  • This relay comprises a plurality of movable contacts adapted to connect to the leads 23, 24 either a first set of winding contacts 28, 29 or a second set of winding contacts 28', 29. Connection to the said first contacts results in rotation of the motor in one sense and connection to the other said contacts results in rotation of the motor in the opposite sense.
  • the relay 27 has two energising coils 30, 31, the coil 30 being connected in parallel with the connection between the field windings 26 and the lead 24, and the coil 31 being connected in series with the connection between the brushes 26a and the same said lead 24 via a thermal relay 32.
  • the shaft of the motor 25 of the emergency circuit is connected to the winch 35 either directly or (as shown in FIG 3) through clutch means and suitable drives in order to effect movement of the car 8 either up or down.
  • the device operates as follows:
  • the lever 11 When, for any of the reasons instanced hereinbefore, the lever 11 moves into the position shown in FIG. 2, it closes the contacts 13a, and the storage battery 18 feeds the control resistor of the thermal relay 32 as well as the resistors of a similar relay 21.
  • the battery also feeds the auxiliary motor 25 and an electromagnet 20 which is arranged to operate the winch brake 37 in the manner of the magnet 39, which latter may of course be without energising current.
  • the thermal relay 21 cuts in a limiting resistor 22 for reasons well known in the art.
  • the motor 25 If the power of the auxiliary motor 25 is sufficient to set the winch 35 in motion, in the direction dictated by the position of the relay 27, the motor will continue to rotate and the car 8 start its re-levelling travel to reach the nearest landing. Under these conditions the armature current for the motor 25 flows through the coil 31 of the switch relay, the bimetallic strip of the thermal relay 32 having in the meantime opened as shown in FIG. 2. This current alone is not however strong enough to effect attraction of the movable portion ofthe relay 27 and consequent relay change-over.
  • auxiliary motor 25 If the power of the auxiliary motor 25 is insufiicient to move the car in the direction dictated by the relay 27, the motor will stop and the armature current increase in intensity. This results in energisation of the relay coil 31 and consequently more substantial attraction of the movable portion of the relay 27 so that the contacts thereof are moved over into the position shown in FIG. 2.
  • the polarity of the feed to the motor field windings 26 is thereby reversed and the sense of rotation of the said motor 25 is similarly reversed. This sets the winch 35 in motion in a reverse direction so as to move the car in the opposite direction.
  • the coil 30, which is now energised because it is in parallel with the field circuit 26 of the electric motor 25, intensifies the magnetic field created by the coil 31, thereby ensuring retention of the movable portion of the switch relay 27 in the adopted position despite subsequent diminution of the current through coil 31.
  • a centrifugal brake (not shown) is provided on the shaft of the auxiliary motor 25 to prevent overspeed of the car during operation of the emergency device.
  • the contact 13a opens the emergency operating circuit and the motor 25 stops.
  • the electromagnet of the brake 20 is de-energised and the winch is also stopped.
  • the contact 14a is however automatically reclosed and the plant is again in order for normal operation.
  • the storage battery 18 can, of course, also be used for feeding alarm bells or a permanent emergency lighting plant in the car.
  • the energy available as a result of the difference in weight between the lift car and its load and the counterweight can be utilised.
  • the motor 25 rotates to displace the car in a direction requiring only that power which is within the limited power-handling capabilities of the motor 25.
  • the essence of the invention is to dispense with auxiliary motors capable of moving the car in either direction.
  • the auxiliary motor is in fact utilized primarily to overcome the passive and starting resistances of the plant, so that its power can be low and in any case unrelated to the size, weight and capacity of the lift plant.
  • the device can incorporate two separate auxiliary electric motors one for up and one for down travel, or even a motor or motors of other than electric drive.
  • Automatic emergency relevelling device for a lift car comprising an emergency car operating circuit, which said circuit comprises an emergency car control means of relatively low power, the said device further comprising a winch for effecting vertical movement of the said car and the said emergency car control means being arranged to be automatically actuated as a result of accidental stoppage of the car between two landings and to effect relevelling of the car to one of the said two landings by displacing the car in a direction which results in power requirements within the capabilities of the said low power means.
  • the emergency control means comprises a direct current electric motor fed from a storage battery and the emergency operating circuit includes an electromagnet adapted to effect opening of a brake for the winch, first means being provided for maintaining the said emergency circuit open during normal operation of the lift by a normal operating circuit and for automatically closing it in the event of an emergency due to stoppage of the car between two landings, and further means provided for permitting operation of the motor on closure of the emergency circuit in that sense of rotation which results in displacement of the car in the said direction.
  • the said first means comprises a swing lever having a" curved arm adapted to encircle in part a pulley freely rotatable on a stationary pivot, the said lever carrying "on its other arm an electrical bridge piece adapted in one of two operative positions of the lever to close the said emergency operating circuit and in the other of the said positions to close the normal operating circuit of the lift.
  • the said relay is provided with energising coils adapted to be fed from the armature current flowing in the field circuit of the motor, the said coils being energised by the armature current to change over the said relay and reverse the current polarity when the said current exceeds a predetermined value corresponding to the power capabilities of the motor being exceeded by excessive resistance to car movement.
  • a thermal relay is provided and the said reversing relay is provided with two separate coils, one said coil being series connected with the emergising circuit for the said motor via the said thermal relay which latter is adapted to shortcircuit the said coil at the beginning of the emergency operation and so prevent the passage therethrough of a current suflicient to change over the relay, and the other said coil being paralleled with the motor field winding so as to be de-energised after reversal of the polarity and to cooperate with the said first mentioned coil in order to maintain the relay position constant during the period of operation of the motor.

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  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Control And Safety Of Cranes (AREA)
US636951A 1966-05-09 1967-05-08 Automatic emergency relevelling device for lifts Expired - Lifetime US3469657A (en)

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Application Number Priority Date Filing Date Title
IT1054466 1966-05-09

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US3469657A true US3469657A (en) 1969-09-30

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US (1) US3469657A (xx)
BE (1) BE698121A (xx)
DE (1) DE1506484B1 (xx)
ES (1) ES341092A1 (xx)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706357A (en) * 1970-03-30 1972-12-19 Joseph Elmer Simpson Elevator emergency actuator and rescue unit
US3902573A (en) * 1974-01-23 1975-09-02 Donald E Grove Elevator control system
US4007811A (en) * 1975-02-24 1977-02-15 Mitsubishi Denki Kabushiki Kaisha Control for elevator
US4220222A (en) * 1977-07-18 1980-09-02 Mitsubishi Denki Kabushiki Kaisha Automatic landing apparatus in service interruption
US4316097A (en) * 1979-12-14 1982-02-16 Reynolds William R Backup power circuit
US4376471A (en) * 1980-01-21 1983-03-15 Mitsubishi Denki Kabushiki Kaisha Emergency apparatus for elevator
US4533021A (en) * 1982-11-15 1985-08-06 Perez Marcelino De La Lift exit emergency safety system
US4662478A (en) * 1984-06-12 1987-05-05 Mitsubishi Denki Kabushiki Kaisha Apparatus for automatic floor arrival at service interruption in A. C. elevator
US5712456A (en) * 1996-04-10 1998-01-27 Otis Elevator Company Flywheel energy storage for operating elevators
US6119816A (en) * 1998-09-04 2000-09-19 Kabushiki Kaisha Toshiba Emergency stop releasing method for elevator
CN104401830A (zh) * 2014-10-21 2015-03-11 广州日滨科技发展有限公司 有机房电梯电动救援盘车装置
US20170050821A1 (en) * 2015-08-18 2017-02-23 Kone Corporation Method for moving an elevator car

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2738051A1 (de) * 1977-08-24 1979-03-01 Guenter Grigoleit Sicherheitsvorrichtung fuer personen- und lastenaufzuege
DE3419443A1 (de) * 1984-05-24 1985-11-28 Schaltgerätebau Walter Nunn, 8130 Starnberg Vorrichtung zum anheben oder absenken einer aufzugskabine aus einer lage, in der sie durch ausfall ihres normalantriebs stehengeblieben ist und unter der wirkung einer sie in ihrer lage festhaltenden festhaltevorrichtung steht

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701033A (en) * 1953-03-18 1955-02-01 Lester F Chiselbrook Emergency elevator control system
US3144917A (en) * 1961-09-27 1964-08-18 Edward Kohlhepp Elevator safety control system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH290984A (fr) * 1950-06-02 1953-05-31 Combaluzier & H Baldet Societe Ascenseur.
FR1164563A (fr) * 1956-09-10 1958-10-13 Appareil de traction autonome de secours pour dépannage d'ascenseurs et autres
US2968364A (en) * 1960-01-29 1961-01-17 Harry R Robertson Emergency elevator circuit
FR1407529A (fr) * 1964-09-11 1965-07-30 Dispositif mécanique de manoeuvre automatique de secours, notamment pour ascenseurset monte-charges
FR1419948A (fr) * 1964-11-26 1965-12-03 Hitachi Ltd Système d'arrêt automatique à l'étage de la cabine d'un ascenseur en cas de défaillance de l'alimentation électrique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701033A (en) * 1953-03-18 1955-02-01 Lester F Chiselbrook Emergency elevator control system
US3144917A (en) * 1961-09-27 1964-08-18 Edward Kohlhepp Elevator safety control system

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706357A (en) * 1970-03-30 1972-12-19 Joseph Elmer Simpson Elevator emergency actuator and rescue unit
US3902573A (en) * 1974-01-23 1975-09-02 Donald E Grove Elevator control system
US4007811A (en) * 1975-02-24 1977-02-15 Mitsubishi Denki Kabushiki Kaisha Control for elevator
US4220222A (en) * 1977-07-18 1980-09-02 Mitsubishi Denki Kabushiki Kaisha Automatic landing apparatus in service interruption
US4316097A (en) * 1979-12-14 1982-02-16 Reynolds William R Backup power circuit
US4376471A (en) * 1980-01-21 1983-03-15 Mitsubishi Denki Kabushiki Kaisha Emergency apparatus for elevator
US4533021A (en) * 1982-11-15 1985-08-06 Perez Marcelino De La Lift exit emergency safety system
US4662478A (en) * 1984-06-12 1987-05-05 Mitsubishi Denki Kabushiki Kaisha Apparatus for automatic floor arrival at service interruption in A. C. elevator
US5712456A (en) * 1996-04-10 1998-01-27 Otis Elevator Company Flywheel energy storage for operating elevators
US6119816A (en) * 1998-09-04 2000-09-19 Kabushiki Kaisha Toshiba Emergency stop releasing method for elevator
CN104401830A (zh) * 2014-10-21 2015-03-11 广州日滨科技发展有限公司 有机房电梯电动救援盘车装置
CN104401830B (zh) * 2014-10-21 2017-01-11 广州日滨科技发展有限公司 有机房电梯电动救援盘车装置
US20170050821A1 (en) * 2015-08-18 2017-02-23 Kone Corporation Method for moving an elevator car
US10662028B2 (en) * 2015-08-18 2020-05-26 Kone Corporation Method for moving an elevator car

Also Published As

Publication number Publication date
BE698121A (xx) 1967-10-16
ES341092A1 (es) 1968-06-16
DE1506484B1 (de) 1972-04-27

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