US3587785A - Elevator control system safety arrangement - Google Patents

Elevator control system safety arrangement Download PDF

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Publication number
US3587785A
US3587785A US804242A US3587785DA US3587785A US 3587785 A US3587785 A US 3587785A US 804242 A US804242 A US 804242A US 3587785D A US3587785D A US 3587785DA US 3587785 A US3587785 A US 3587785A
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Prior art keywords
car
landing
contacts
relay
zone
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US804242A
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English (en)
Inventor
Otto Albert Krauer
Sheldon Edwin Kornbluth
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Otis Elevator Co
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Otis Elevator Co
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Priority claimed from CH713670A external-priority patent/CH533061A/de
Priority claimed from FR7017925A external-priority patent/FR2087379A5/fr
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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
    • B66B5/0006—Monitoring devices or performance analysers
    • B66B5/0018—Devices monitoring the operating condition of the elevator system
    • B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
    • 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
    • B66B13/22—Operation of door or gate contacts
    • 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

  • a relatively large zone extending on both sides of each landing is established so that the elevator car and hoistway doors may start to open while the car is leveling into registry with any landing at which [54] ELEVATOR CONTROL SYSTEM SAFETY it is stopping. This permits the doors to be open a substantial ARRANGEMENT amount by the time the car stops at the landing.
  • a smaller 23 Claims, 39mm 518$ zone extending on both sides of each landing is also established so that upon entering this zone the car is thereafter [52] US.
  • a control system for an elevator car which is movable throughout a building to serve a plurality of landings located therethrough by starting from and stopping at selected ones of them, and which includes a plurality of hoistway doorway closures including at least one door at each landing.
  • the elevator car also has a doorway closure including at least one door. Both the car and the hoistway doors are movable between opened and closed positions.
  • a leveling position means which comprises part of the car's landing selector machine and includes a switching means common to all landings, operates to define a leveling zone which extends the specific distance on either side of the selected landing.
  • Leveling control means including a distance controlled speed dictation signal generating device, which also comprises part of the landing selector machine, operates in response to the operation ofthe leveling position means.
  • the leveling control means controls the movement of the car at a reduced speed in accordance with its distance from the selected landing during its approach through the leveling zone to level the car to a stop in substantial registry with the selected landing.
  • the leveling control means also operates to relevel the car and maintain such registry after the car has stopped and it is enabled to cause both the leveling and releveling operations notwithstanding the opened positions of the car and hoistway doors.
  • Movement of the car through the leveling zone brings it within a second predetermined distance of the selected landing and an inner position means, comprising part of the landing selector machine and including another switching means common to all landings, operates to define an inner zone which extends this second predetermined distance on either side of the landing.
  • door control means is actuated to move the hoistway door or doors at the selected landing and the car door or doors from their closed to their opened positions. Entry into the inner zone causes the actuation of a safety means including a reliability circuit which thereafter limits the zone in which the leveling control means is enabled to control the movement of the car while it remains at the selected landing with the doors open to the inner zone.
  • outer position means is also provided. This too comprises part of the landing selector machine and includes another switching means which is partially individual to each landing and partially common to all landings. It operates in response to the location of the car within a first predetermined distance on either side of the selected landing farther therefrom than the second predetermined distance. When operated it defines an outer zone for the selected landing. The operation of this outer position means actuates the door control means.
  • the safety means operates in response to the operation of both the outer position means and the movement of the car and hoistway doors to their opened positions in conjunction with the failure of the car to enter the inner zone to prevent the car from making a trip from the selected landing to another.
  • the safety means also operates to stop the car and to prevent it from making a trip from a selected landing should the car overspeed while at the landing with its door or one of the hoistway doors open.
  • the invention includes a speed responsive means comprising a tachometer generator and a switching means which responds to a predetermined speed of the car. The safety means operates if the speed responsive means indicates that the car is traveling at this predetermined speed when either the car door or the hoistway door at the selected landing is in its opened position.
  • the speed responsive means is also employed to protect against a misoperation in which either the elevator car or its selector machine functions in a manner other than that intended for it such that the operation of one is inconsistent with that of the other.
  • the selector machine includes both a synchronous panel which moves in synchronism with the elevator car and an advancer carriage which moves in advance of the synchronous panel in a direction appropriate for the direction of car movement to select the next landing at which the car is to stop and to provide speed control signals to decelerate the car in accordance with its distance from the selected landing.
  • the safety means operates to stop the car and prevent it from making a trip to another landing.
  • safety means operates to stop the car and prevent it from making a trip from a selected landing should the car change its acceleration too rapidly while its door or one of the hoistway doors is open.
  • the safety means In addition to safeguarding the intended operation of the elevator car, the safety means also monitors itself to protect against failure of its own equipment. Part of this self-monitoring operation includes preventing the car from making a trip from the selected landing to another in case the inner position means fails to operate after the outer position means operates and the car and hoistway doors move to their opened positions. Also the self-monitoring operation prevents the car from making a trip to another landing if the outer position means fails to operate and either the inner position means operates or the doors move to their opened position. Moreover, the self-monitoring operation prevents the car from making a trip to another landing if the outer position means operates to its unactuated condition before the inner position means operates to its unactuated condition.
  • the self-monitoring operation of the safety means also provides protection against the failure of the tachometer generator to produce an output signal.
  • a circuit is provided which stops the car and prevents it from making a trip from the selected landing to another if the tachometer generator is not producing an output signal when the leveling position means on the landing selector machine operates to indicate the entry of the car into the leveling zone at the selected landing.
  • FIG. 1 is a schematic diagram of an elevator control system employing the invention
  • FIG. 2 is a wiring diagram in straight line form of relay circuits employed in the control system of FIG. 1;
  • FIG. 3 is a plurality of comparator circuits in block diagram form together with associated relay coils and relay drive circuits.
  • relays are shown with their coils in the deenergized condition. Consequently, all relay contact pairs are illustrated in what is referred to as their unactuated condition. They are in the opposite or their actuated condition when their associated coils are energized.
  • the elevator system is illustrated as serving only three landings although the invention is not so limited and may be used in installations with any number of landings.
  • car doorway closure will be referred to as a car door or as car door means and each of the hoistway doorway closures will be referred to as a hoistway door or as hoistway door means, it being understood that by this is meant any suitable type of car doorway closure and hoistway doorway closure whether of the single or plural door variety.
  • traction sheave TS is mounted for rotation on the shaft of armature of the direct current elevator hoisting motor. Also driven in any suitable way by the same shaft is tachometer generator 34 which produces on line VT voltage signals whose magnitudes are proportional to the speed of rotation of armature l0 and whose polarities are indicative of the direction of such rotation.
  • hoist ropes 11 pass over sheave TS and support elevator car CA and its counterweight CW.
  • the car moves whenever brake BR is lifted and the elevator hoisting motor enables sheave TS to rotate.
  • Main field 14 of the hoisting motor is connected across a constant potential source represented as battery 15.
  • motor armature 10 is connected to ground across the output circuit of a direct current generator whose armature 16 is mounted on the same shaft as the rotating element 18 of a drive motor, not otherwise shown.
  • Main field 20 of the direct current generator is connected through contacts C 1-2 of potential switch C to receive excitation from operations and motor control equipment OMCS.
  • this equipment is also connected through line W2 to receive distance controlled speed dictation signals from selector machine 42 during both main and leveling operations.
  • Tape TA connected between car CA and counterweight CW rotates sprocket SDS to drive the selector machine.
  • Sensing coils CDC and CCDC are wound on C-shaped cores which permit the wire conductor between generator armature l6 and motor armature 10 to pass between the concave openings thereof.
  • the material of these cores and the impedance of the coils and their connected circuitry are so chosen as to prevent the cores from saturating in response to a rate of change of acceleration with respect to time which is less than a predetermined amount.
  • FIG. 2 lines L+ and L- are connected to a voltage source of suitable potential to operate the relays whose coils are connected across these lines.
  • Gate switch GS represents a typical switch operated in accordance with the position of the car door means.
  • Door switches IDS, ZDS and TDS represent typical switches operated in accordance with the position of the hoistway door means for the first, second and top landings, respectively.
  • Each of the gate and door switches closes when its respective door means is approximately three-quarters of an inch from its fully closed position and opens when its respective door means is opened more than this distance. Such switches are well known in the art.
  • Gate switch GS and switches lDS, 2DS and TDS and door relay GDS comprise a portion of any typical door control means suitable to move the car and hoistway door means between their opened and closed positions.
  • the dotted line box identified by the reference characters DCC represents the remainder of the door control means including a door operating device.
  • Such equipment comprising a closure means for the elevator car.
  • Outer zone brushes 10DB, 20DB and TODB are mounted on landing selector machine 42 at positions corresponding to the location in the hoistway of the first, second and top landings, respectively.
  • Outer zone contacts ODC are also mounted on the selector machine 42. They are carried so as to move in synchronism with the elevator car and are bridged by one of the brushes 10DB, 20DB and TODB whenever the car is within a first suitable predetermined distance on either side of the landing associated with the respective bridging brush. Stated otherwise, contacts ODC are bridged by the brush 10DB, 20DB or TODB associated with a selected landing whenever the car is located within an outer zone at the selected landing which is defined by the space between two predetermined points one each within a suitable distance on either side of the selected landing.
  • a suitable distance is meant a sufficient distance to have the car and hoistway doors open a satisfactory amount while the car is leveling to a stop at a landing. This, of course, varies from installation to installation according to various factors including the type of door operating device and the weight and the size of the doors.
  • the outer zone will be described as being inside the leveling zone. In most instances this will be the case. However, it is to be understood that it is contemplated that the outer zone and the leveling zone might be coextensive.
  • Brushes 10DB, 20DB and TODB, contacts ODC and outer zone relay ODZ together comprise that part of the invention referred to as outer car position means or simply outer position means.
  • Contacts SPDSl correspond to those contacts identified by the same reference characters and shown in FIG. 10 of the foregoing Krauer et al. application.
  • contacts SPDSI and a second pair of contacts SPDS2 of mechanical switch SPDS on selector machine 42 close and open, respectively, when the car approaches within one to two feet of a landing at which it is stopping.
  • these two contact pairs transfer control of the elevator hoisting motor from a long range distance controlled speed dictation signal generating device including potentiometer POT operable to provide main operation to a short range one including potentiometer POTll operable to provide leveling operation.
  • contacts SPDS2 are eliminated and contacts SPDS1 are employed to energize the coil of leveling zone relay HXB.
  • Contacts SPDSl close when the car enters a leveling zone at a selected landing at which it is stopping; such leveling zone being defined by the space between two points one on either side of the selected landing and each within one to two feet thereof.
  • Contacts HXB 3-4 and HXB 5-6 (FIG. 1) of relay HXB are employed to perform the functions performed by contact pairs SPDSl and SPDS2 in the system of the foregoing Krauer et al. application.
  • Switch SPDS, contact pair SPDSI and relay HXB comprise that part of the invention referred to as the leveling position means.
  • Contact pairs ADU and ADD are operated by mechanical switches mounted on selector machine 42 which operate in a manner similar to that of switch SPDS. Contacts ADU close when the advancer carriage is a specific distance from the synchronous panel in a direction corresponding to up car movement and contact ADD correspondingly operate for the down direction car movement.
  • the dotted line box identified by the reference character S represents the standard safety devices employed in the typical elevator control system.
  • inner zone comparator IDZCOM operates to provide a signal to relay driver RDIDZ which is in conjunction with the potential along line V3 is suitable to energize the coil of inner zone relay IDZ. Such operation occurs so long as the magnitude of the signal along either line V1+ or line V1 exceeds the magnitude of the signal of opposite polarity along line VS from landing selector machine 42.
  • an inner position means is provided which operates in response to the location of the car inside an inner zone at a selected landing at which the car is stopping; such inner zone being inside the leveling zone and being defined by the space between two additional predetermined points in the hoistway one on either side of the selected landing. In the embodiment described it is suitable to have each of these points within 2 inches of a selected landing.
  • Like inner zone comparator IDZCOM maximum up and down speed comparators MZSUCOM and MZSDCOM operate to provide a signal to relay drivers RDMZSU and RDMZSD which in conjunction with the potential along line V3 is suitable to energize the coils of maximum up and down speed relays MZSU and MZSD.
  • One of these is energized so long as the magnitude of the signal along either line V2+ or line V2 exceeds the magnitude of the signal of opposite polarity along line VT from tachometer generator 34.
  • relays MZSU and MZSD operate to indicate that the speed of the car in the up and down directions respectively is below a predetermined magnitude.
  • Tachometer output comparator THOCOM operates to pro vide a signal to relay driver RDTHO which in conjunction with the potential along line V3 is suitable to energize the coil of tachometer output relay THO whenever the magnitude of the output signal from tachometer generator 34 along line VT exceeds the magnitude of the signal of opposite polarity along line V4+ or V4-. Since the magnitudes of the signals along lines V4+ and V4 are selected at values only slightly in excess of the noise level potential of tachometer generator 34 the operation of relay THO indicates that the tachometer generator is producing an output signal greater than its normal noise level. This is a suitable indication that the tachometer generator is operating satisfactorily.
  • contact pair SPDSl closes to energize the coil of relay HXB (FIG. 2).
  • This closes contacts HXB 1-2 (FIG. 2) and contacts I-IXB 3-4 (FIG. 1) and opens contacts I-IXB 5-6 (FIG. 1).
  • Contacts HXB 3-4 and HXB 5-6 in closing and opening respectively transfer the system from main operation to leveling operation.
  • Contacts I-IXB 1-2 close to prepare circuits for door control equipment DCC and the coil of outer zone relay ODZ.
  • Movement of the car under leveling operation brings it within a first suitable predetermined distance of landing F2 whereupon brush 20DB bridges contacts ODC.
  • This energizes the coil of relay ODZ closing contacts ODZ 7-8 ODZ 9-10 and ODZ 13-4 while at the same time opening contacts ODZ 1-2 and ODZ 3-4.
  • door control equipment DCC is energized to open the door of car CA and the hoistway door at landing F2.
  • contacts GDS 11-12 in one of the circuits for the coil of second auxiliary potential relay CY2 open. This coil however remains energized through the circuit including now closed contacts ODZ 9-10.
  • contacts GDS 9-10 open in the coil circuit of first auxiliary potential relay CYl to release that relay.
  • contacts GDS 7-8 open in the coil circuit of potential switch C that coil remaining energized through the circuit of now closed contacts ODZ 7-8.
  • Contacts GDS 1-2 close to maintain a circuit for the coil of potential switch C after contacts CYl 11-12 disengage.
  • the elevator car is now leveling into landing F2 and both the car door and the hoistway door for that landing are moving between their closed and opened positions.
  • the present invention provides an arrangement which enables an elevator car to open its door and the hoistway door of the landing at which it is stopping while the car is leveling and after it has entered a relatively large outer zone at the landing.
  • the car levels into a smaller inner zone it is thereafter prevented from leaving that inner zone as long as the doors remain open. In this way, the leveling operation is restricted to this smaller inner zone once the car has entered it.
  • Systems in which cars stop at landings without opening their doors similarly can be arranged to limit the leveling operation of their cars while located at such landings with their doors closed to the smaller inner zone.
  • the car is prevented from making a trip to another landing if a misoperation prevents it from entering the smaller inner zone at any landing.
  • door relay GDS is deenergized
  • relay CYl is deenergized
  • relay CY2 is energized through contacts lDZ 3-4, ODZ 9-10 and CY2 11-12
  • potential switch C is energized through the circuit including contacts GDS l-2, CY2 13-14 and ODZ 7-8.
  • inner zone relay lDZ remains deenergized and contacts lDZ 7-8 and lDZ 9-10 remain open.
  • relay CY1 also remains deenergized and its contacts CYl 11-12 remain open. This in conjunction with the open condition of contacts lDZ 7-8 eliminates the parallel paths for the coil of potential switch C which otherwise would be provided through these contacts if the car and its control equipment operated in their intended manner.
  • door relay GDS remains deenergized. This maintains contacts GDS 7-8 separated. Movement of the advancer carriage from the position of the synchronous panel sufficiently to open contacts SPDSl to release relay HXB and open contacts HXB 1-2 or movement of the car more than the first predetermined distance to separate brush DB from its bridging relationship with contact ODC interrupts the circuit for the coil of outer, zone relay ODZ causing its deenergization. This releases relay ODZ to open contacts ODZ 7-8 interrupting the circuit for the coil of potential switch C causing its deenergization. As previously described switch C releases to bring the car to a stop and prevent it from making a subsequent trip.
  • the above described circuitry comprises a safety means for an elevator control system.
  • it also. comprises a reliability circuit means which operates to provide protection against failure of its own components.
  • a reliability circuit means which operates to provide protection against failure of its own components. For example, it is apparent that if inner zone relay lDZ or its coils energizing circuit misoperates and relay lDZ fails to transfer its contacts to their actuated condition upon the car entering the inner zone, the circuit operates to prevent the car from starting on a trip to another landing the same as it does if relay [D2 is not operated because the car fails to enter the inner zone.
  • inner zone relay [D2 or its coils energizing circuit misoperate and transfer its contacts from their actuated to their unactuated condition while the car is in the inner zone the circuit operates to release potential switch C and prevent the car from making a trip to another landing the same as it does if relay lDZ released because the car departed from the inner zone with its or the hoistway door open.
  • relay ODZ releases upon the advancer carriage moving sufficiently from the position of the synchronous panel to open contacts SPDS1 and release relay HXB to open contacts HXB 1-2 or upon movement of the car more than the first predetermined distance from the landing to separate brush 20DB from its bridging relationship with contacts ODC.
  • the reliability circuit also provides protection against failures of outer zone relay ODZ. Assume as before that the car has entered both the leveling zone and the outer zone at landing F2 and that for some reason outer zone relay ODZ fails to transfer its contacts from their unactuated to their actuated condition. As soon as the doors open beyond threequarters of an inch from their fully closed positions door relay GDS releases to open contacts GDS 7-8. Because contacts ODZ 7-8 have not closed this interrupts the circuit for the coil of potential switch C and deenergizes it. Thus, switch C releases to stop the car and prevent it from making a subsequent trip, as previously explained.
  • a misoperation can also occur to cause door relay GDS to transfer its contacts from their actuated to their unactuated condition when the car is outside the outer zone. If this occurs contacts GDS 7-8 open to release potential switch C to stop the car and prevent it from making a subsequent trip.
  • the relays desirable for use at least as door relay GDS, outer zone relay ODZ and inner zone relay [D2 are of a type which cannot operate their contacts from one condition to another if one of the contact pairs has welded.
  • Protection is also provided against the elevator car exceeding a predetermined speed with either its car or one of its hoistway doors open. If the speed is exceeded in the up direction the negative polarity voltage from tachometer generator 34 along line VT is of sufficient magnitude to exceed the positive polarity potential along line V2+ to cause the release of maximum speed up relay MZSU to open its contacts MZSU 1-2. If the predetermined speed is exceed in the down direction the positive polarity voltage from tachometer generator 34 is of sufficient magnitude to exceed the negative polarity potential along line V2 to cause the release of maximum speed down relay MZSD to open its contacts MZSD l-2.
  • the output signal from tachometer generator 34 is used to provide protection against overspeeding with the doors open it is desirable to monitor the tachometer generator in order to safeguard against an unsafe condition resulting from its failure to produce an output signal. This monitoring is performed during each trip of the car. Every time the car receives a signal to start from a landing on a trip to another,
  • tachometer monitoring relay T is energized if tachometer generator 34 produced an output signal while the car was stopping at the landing from which it is to start.
  • Contacts MZSD 3-4 of maximum down speed relay MZSD and mechanical switch contacts ADD on selector machine 42 operate in a similar fashion to protect against inconsistent operation of the selector machine when the car is traveling down.
  • contacts of leveling position relay HXB are employed in the circuits that monitor the proper functioning of tachometer generator 34.
  • contacts of a mechanical switch which operates directly in response to the distance of the car from a selected landing other than contacts SPDSI or contacts of a relay which operates in response to the operation of this other mechanical switch.
  • a control system for an elevator car having a closure means and movable to make trips to serve a plurality of landings by stopping at most a desired distance from selected ones of said landings and by operating its closure means upon so stopping to permit passenger transfers to and from the car, comprising; outer car position means operating from a first condition to a second condition in response to the location of said car within a first predetermined distance on either side of a selected landing at which said car is stopping; inner ear position means operating from a first condition to a second condition in response to the location of said car within a second predetermined distance on either side of said selected landing closer thereto than said first predetermined distance and farther therefrom than said desired distance; said first conditions of said outer and inner ear position means signifying the location of said car outside said first and said second predetermined distances, respectively; said second conditions of said outer and inner ear position means signifying the location of said car inside said first and second predetermined distances, respectively; said outer and inner car position means being two separate means each capable of operating independently of the other; and safety means operating in
  • said safety means also operates to prevent said car from making a trip from said selected landing to serve another landing in response to the operation of said inner ear position means to said second condition and the failure of said outer car position means to operate to said second condition.
  • a control system for an elevator car movable to make trips to serve a plurality of landings by starting from and stopping at selected ones of said landings comprising; outer car position means operating in response to the location of said car inside an outer zone defined by the space within a first predetermined distance on either side of a selected landing at which said car is stopping and signifying by said operation the location of said car inside said outer zone; inner ear position means operating in response to the location of said car inside an inner zone defined by the space within a second predetermined distance on either side of said selected landing closer thereto than said first predetermined distance and signifying by said operation the location of said car inside said inner zone; said outer and inner ear position means being two separate means each capable of operating independently of the other; and safety means operating in response to the loca tion of said car inside said outer zone and the failure of said car to enter said inner zone and preventing said car from making a trip from said selected landing to serve another landing; said safety means also operating in response to both the operation of said inner ear position means to signify the location of said car within
  • a control system wherein said safety means also operates to prevent said car from making a trip from said selected landing to serve another landing in response to the operation of said outer car position means to signify the location of said car inside said outer zone and the failure of said inner ear position means to operate to signify the location ofsaid car inside said inner zone.
  • a control system for an elevator car movable on trips throughout a building hoistway to provide service to a plurality of landings by starting from and stopping at any selected ones of said landings comprising; leveling position means operating in response to the location of said car inside a leveling zone at a selected landing at which said car is stopping, said leveling zone being defined by the space between two predetermined points in said hoistway one on either side of said selected landing; inner position means operating in response to the location of said car inside an inner zone at said selected landing, said inner zone being inside said leveling zone and being defined by the space between two other predetermined points in said hoistway, one on either side of said selected landing; car door means on said car movable between a closed position and an opened position; hoistway door means at each landing, each movable between a closed position and an opened position; door control means operating while said car is located inside the leveling zone at said selected landing and before it enters the associated inner zone and controlling said car door means and the hoistway door means at said selected landing to move from their closed
  • a control system including outer position means operating in response to the location of said car inside an outer zone at said selected landing, said outer zone being inside said leveling zone and surrounding said inner zone and being defined by the space between two additional predetermined points in said hoistway, one on either side of said selected landing; and wherein said safety means operates to prevent said car from making a trip from said selected landing to provide service to any other landing in response to both the operation of said outer position means and the failure of said inner position means to operate.
  • a control system according to claim 6, wherein said safety means also operates to prevent said car from making a trip from said selected landing to provide service to any other landing in response to both the operation of said inner position means and the failure of said outer position means to operate.
  • said inner position means includes an inner zone relay having a plurality of contacts which are transferred from an unactuated to an actuated condition in response to the location of said car inside said inner zone; and said safety means includes circuitry comprising contacts of said inner zone relay through which said leveling control means is enabled to operate said circuitry being completed to enable the operation of said leveling control means in response to the transfer of the contacts of saidmiter zone relay to their actuated condition.
  • said door control means includes a door relay having a plurality of contacts which are transferred from an unactuated to an actuated condition in response to said car door means and all said hoistway door means being in their closed positions; said outer position means includes an outer zone relay having a plurality of contacts which are transferred from an unactuated to an actuated condition in response to the location of said car inside said outer zone; and said safety means includes additional circuitry comprising contacts of said inner zone relay, said door relay and said outer zone relay through which said leveling control means is enabled to operate, said additional circuitry being rendered ineffective to enable the operation of said leveling control means upon the contacts of said inner zone relay transferring to their actuated condition.
  • a control system wherein all the circuitry constituting said safety means forms a reliability circuit means which monitors the operation of said inner zone relay, said outer zone relay and said door relay to protect against failure of said relays producing an unsafe condition for said elevator car.
  • a control system wherein said reliability circuit means operates to prevent said elevator car from making a trip from said selected landing, firstly immediately if said inner zone relay fails and transfers its contacts from their actuated condition to their unactuated condition when the car is located inside the inner zone, and secondly, upon the car door means and the hoistway door means at said selected landing moving to their closed positions, if said inner zone relay fails, when said car is located inside said outer zone, and prevents its contacts from transferring from their unactuated condition to their actuated condition in response to the entry of said car into said inner zone, and thirdly, immediately, if said inner zone relay fails and transfers its contacts from their unactuated condition to their actuated condition when said car is located outside the outer zone, and fourthly, upon the departure of said car from the outer zone, if said inner zone relay fails when said car is located inside said inner zone, and prevents its contacts from transferring from their actuated condition to their unactuated condition in response to the departure of said car from said inner zone.
  • a control system wherein said reliability circuit means operates to prevent said elevator car from making a trip from said selected landing, firstly, immediately, if said outer zone relay fails and transfers its contacts from their actuated to their unactuated condition when said car is located inside the inner zone or when it is located inside the outer zone and said door relay contacts are in their unactuated condition, secondly, upon the car entering said inner zone or upon said door relay contacts transferring to their unactuated condition if said outer zone relay fails, either when the car is outside said outer zone, and prevents its contacts from transferring from their unactuated to their actuated condition when the car enters the outer zone, or, when the car is located inside the outer zone, and transfers its contacts from their actuated to their unactuated condition before the car enters the inner zone or said door relay contacts transfer to their unactuated condition.
  • said reliability circuit means operates to prevent said elevator car from making a trip from said selected landing, firstly, immediately, if said door relay fails, when said car is located outside said outer zone, and transfers its contacts from their actuated condition to their unactuated condition and secondly, upon said car departing from said outer zone if said door relay fails, when said car is located inside said outer zone, and prevents its contacts from transferring from their unactuated condition to their actuated condition upon all doors reaching their closed positions.
  • a control system including speed responsive means operating in response to a predetermined speed of said car and wherein said safety means operates to stop said car if said speed responsive means operates when said door relay contacts are in their unactuated condition.
  • a control system for an elevator car movable on trips throughout a building hoistway to provide service to a plurality of landings by starting from and stopping at any selected ones of said landings comprising; car door means on said car movable between a closed position and an opened position; hoistway door means at each landing, each movable between a closed position and an opened position; door control means operating in response to the approach of said car to within a predetermined distance of a selected landing at which it is stopping and controlling said car door means and the hoistway door means at said selected landing to move from their closed to their opened positions; speed responsive means operating in response to a predetermined speed of said car; and safety means operating to prevent said car from making a trip from said selected landing if said speed responsive means operates when either said car door means or said hoistway door means at said selected landing is in its opened position.
  • said door control means includes a door relay having a plurality of contacts which are transferred from an unactuated to an actuated condition in response to said car door means and all said hoistway door means being in their closed positions; and said safety means operates if said speed responsive means operates when said door relay contacts are in their unactuated condition.
  • a control system including car position means operating in response to the location of said car within a prescribed distance on either side of a selected landing at which said car is stopping; wherein said speed responsive means includes a tachometer generator operable to produce an output signal signifying the speed of said car; and said safety means operates to prevent said car from making a trip from said selected landing if said tachometer generator fails to produce an output signal when said car position means operates.
  • a control system for an elevator car movable on trips throu bout a building hoistway to provide service to a plurality of andlngs by starting and stopping at any selected ones of said landings comprising; speed responsive means operating in response to a predetermined speed of said car in a predetermined direction of travel and signifying said speed and direction; a landing selector machine including a synchronous part operable to signifymovement in synchronism with the movement of said car and an advancer part operable to signify movement in advance of the movement of said car in a direction appropriate for the direction of car movement; advancer position means operating in response to the signified location of said advancer part a prescribed distance away from the signified location of said synchonous part in a direction appropriate for said predetermined direction; and safety means operating to prevent said car from making a trip to another landing if said speed responsive means operates to signify the predetermined speed for said car in the predetermined direction and the advancer position means has failed to operate.
  • a control system for an elevator car movable on trips throughout a building hoistway to provide service to a plurality of landings by starting from and stopping at any selected ones of said landings comprising; rate of change of acceleration responsive means operating in response to a predetermined rate of change of acceleration of said car with respect to time; and safety means operating in response to the operation of said rate of change of acceleration responsive means to stop said car and to prevent it from making a trip to another landing 22.
  • a control system further comprising; car door means on said car movable between a closed position and an opened position; hoistway door means at each landing, each movable between a closed position and an opened position; door control means operating in response to the approach of said car to within a predetermined distance of a selected landing at which it is stopping and controlling said car door means and the hoistway door means at said selected landing to move from their closed to their opened positions and wherein said safety means operates in response to the operation of said rate of change of acceleration responsive means to stop said car and to prevent it from making a trip from said selected landing if said rate of change of acceleration responsive means operates when either said car door means or said hoistway door means at said selected landing is in its opened position.
  • a control system according to claim 22 wherein said door control means includes a door relay having a plurality of contacts which are transferred from an unactuated to an actuated condition in response to said car door means and all said hoistway door means being in their closed positions; and said safety means operates if said rate of change of acceleration responsive means operates when said door relay contacts are in their unactuated condition.

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US804242A 1969-03-04 1969-03-04 Elevator control system safety arrangement Expired - Lifetime US3587785A (en)

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US80424269A 1969-03-04 1969-03-04
CH713670A CH533061A (de) 1969-03-04 1970-05-12 Steuereinrichtung mit einer Sicherheitsvorrichtung für eine Aufzugsanlage
FR7017925A FR2087379A5 (fr) 1970-05-12 1970-05-15
BE752605 1970-06-26

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720292A (en) * 1970-10-29 1973-03-13 J Magee Automatic elevator car positioning monitor
US3741348A (en) * 1969-06-30 1973-06-26 Westinghouse Electric Corp Motor control system
US3961688A (en) * 1974-04-29 1976-06-08 Armor Elevator Company Transportation system with malfunction monitor
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
US4114731A (en) * 1970-05-21 1978-09-19 Otis Elevator Company Elevator safety arrangement
US4308936A (en) * 1980-02-19 1982-01-05 Westinghouse Electric Corp. Elevator system
US4337846A (en) * 1979-04-24 1982-07-06 Mitsubishi Denki Kabushiki Kaisha Elevator relevelling control apparatus
US4367810A (en) * 1979-12-27 1983-01-11 Otis Elevator Company Elevator car and door motion interlocks
US4491199A (en) * 1983-06-29 1985-01-01 Westinghouse Electric Corp. Elevator system
US4494628A (en) * 1983-08-17 1985-01-22 Westinghouse Electric Corp. Elevator system
US4785914A (en) * 1987-06-19 1988-11-22 Westinghouse Electric Corp. Elevator system leveling safeguard control and method
US4976338A (en) * 1989-04-27 1990-12-11 Delaware Capital Formation, Inc. Leveling control system for hydraulic elevator
US4977982A (en) * 1989-12-26 1990-12-18 Otis Elevator Company Elevator sheave brake safety
US5407028A (en) * 1993-04-28 1995-04-18 Otis Elevator Company Tested and redundant elevator emergency terminal stopping capability
EP1852382A1 (fr) * 2005-02-25 2007-11-07 Mitsubishi Denki Kabushiki Kaisha Ascenseur

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741348A (en) * 1969-06-30 1973-06-26 Westinghouse Electric Corp Motor control system
US4114731A (en) * 1970-05-21 1978-09-19 Otis Elevator Company Elevator safety arrangement
US3720292A (en) * 1970-10-29 1973-03-13 J Magee Automatic elevator car positioning monitor
US3961688A (en) * 1974-04-29 1976-06-08 Armor Elevator Company Transportation system with malfunction monitor
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
US4337846A (en) * 1979-04-24 1982-07-06 Mitsubishi Denki Kabushiki Kaisha Elevator relevelling control apparatus
US4367810A (en) * 1979-12-27 1983-01-11 Otis Elevator Company Elevator car and door motion interlocks
US4308936A (en) * 1980-02-19 1982-01-05 Westinghouse Electric Corp. Elevator system
US4491199A (en) * 1983-06-29 1985-01-01 Westinghouse Electric Corp. Elevator system
US4494628A (en) * 1983-08-17 1985-01-22 Westinghouse Electric Corp. Elevator system
US4785914A (en) * 1987-06-19 1988-11-22 Westinghouse Electric Corp. Elevator system leveling safeguard control and method
US4976338A (en) * 1989-04-27 1990-12-11 Delaware Capital Formation, Inc. Leveling control system for hydraulic elevator
US4977982A (en) * 1989-12-26 1990-12-18 Otis Elevator Company Elevator sheave brake safety
US5407028A (en) * 1993-04-28 1995-04-18 Otis Elevator Company Tested and redundant elevator emergency terminal stopping capability
EP1852382A1 (fr) * 2005-02-25 2007-11-07 Mitsubishi Denki Kabushiki Kaisha Ascenseur
EP1852382A4 (fr) * 2005-02-25 2013-01-30 Mitsubishi Electric Corp Ascenseur

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