WO2014188051A1 - Elevator derailment detection system and elevator system comprising the same - Google Patents
Elevator derailment detection system and elevator system comprising the same Download PDFInfo
- Publication number
- WO2014188051A1 WO2014188051A1 PCT/FI2013/050558 FI2013050558W WO2014188051A1 WO 2014188051 A1 WO2014188051 A1 WO 2014188051A1 FI 2013050558 W FI2013050558 W FI 2013050558W WO 2014188051 A1 WO2014188051 A1 WO 2014188051A1
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- WO
- WIPO (PCT)
- Prior art keywords
- elevator
- derailment detection
- detection system
- position switch
- movable element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- 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
- B66B5/021—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions the abnormal operating conditions being independent of the system
- B66B5/022—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions the abnormal operating conditions being independent of the system where the abnormal operating condition is caused by a natural event, e.g. earthquake
Definitions
- Elevator derailment detection system and elevator system comprising the same
- the present invention relates elevators and, in particular, for systems for detecting the railment of a movable element within an elevator.
- Derailment detection is an important safety feature. If
- the elevator system In case derailment is detected, the elevator system must either be set to an inoperative state or be operated in emergency mode only .
- FIG 1 schematically illustrates an elevator system 10 which comprises at least one elevator shaft 18.
- at least one elevator car 11 is arranged in such a manner that it can be moved up and down in the elevator shaft 18.
- At least one counterweight 12 is arranged to balance the movement of the elevator car 11.
- Elevator car 11 and counterweight 12 are connected to each other via at least one hoist 14 (typically cable or belt) that forms a continuous loop around a raotor- driven pulley 15 and another pulley 16.
- hoist 14 typically cable or belt
- a derailment detection rope 13 (such as a steel rope) is attached to a powered (by voltage source 22, for example, as illustrated in FIG 2) safety circuit 20 via a relay 21.
- the detection rope 13 runs the full elevator shaft 18 length adjacent to the counterweight 12.
- the counterweight 12 is equipped with a derailment detection ring 17 (made from
- derailment detection rope 13 has no guidance between the top and bottom ends. This makes the derailment detection rope 13 to swing with wind induced building sway, if the elevator system 10 is installed in a high rise building. The sway can be reduced by increasing the tension in the derailment detection rope 13, but this method is quickly exhausted as the travel gets longer, as explained in WO 2011/010991 Al . This makes this approach unsuitable for high rise buildings.
- counterweight 12 is connected to an open derailment detection ring 37 that allows the derailment detection rope 13 to be guided at certain interval d with isolated fixing elements 31 attached to elevator shaft 18.
- This approach requires a robust fixing and a larger number of fixing elements 31.
- the robust fixing requires large opening in the derailment detection ring 37, which may permit the derailment detection rope to exit the ring 37 without triggering the safety circuit 20.
- this approach may be quite sensitive to the installation tolerance of the fixing elements 31. Even a minute installation error may cause the fixing element 31 to hit the derailment detection ring 37 and damage the system.
- the objective of the invention is to avoid false derailment detection trips that result from swaying of the building by high winds and the like, more reliably than in the traditional ring- on-a-string approach. This objective can be achieved with an elevator derailment detection system according to patent claim 1, and with an elevator system according to patent claim 10.
- the elevator derailment detection system comprises: a) a movable element, such as elevator car or counterweight, slidably mounted on a rail; b) an electrical conductor, such as a steel rope, extending through a hoistway, the electrical conductor being held at electric potential; and c) a sensor connected to the movable element, comprising: cl) a derailment detection ring enclosing the electrical conductor at the location of the derailment detection ring; and c2 ) a position switch configured to electrically connect the derailment detection ring to a different electric potential if the relative position between the position switch and the rail indicates that the movable element has derailed, c3) the derailment detection ring and the position switch configured to coactively cause a ground fault at the electrical conductor; and d) safety circuit configured for detecting ground fault of the electrical conductor.
- a movable element such as elevator car or counterweight
- the elevator derailment detection system can be applied to buildings that are so high that the ring-on-a-string approach would not work, since the detection system is immune to rope sway: only such a derailment that is also detected by a position switch can cause a trip.
- the elevator derailment detection system can be implemented with relatively simple mechanical parts. Compared with the Otis Electrical Company solution presented in WO 2011/010991 Al, the isolated fixing elements may be omitted which may result in easier installation, in particular if the installation
- the derailment detection ring comprises a grounded outer sleeve and an inner sleeve, both being electrically conductive, and electrical isolation between them, false trips can be better avoided, since in order to cause a trip either a supplementary connecting of the inner sleeve to the outer sleeve or such a mechanical deformation of the sleeves causing the sleeves to touch each other is necessary.
- the position switch is configured to connect the outer sleeve to the inner sleeve if the relative position between the position switch and the rail indicates that the movable element has derailed.
- the position switch may be configured to connect the inner sleeve to the potential of the outer sleeve, if the relative position between the position switch and the rail indicates that the movable element has derailed. This way of operation is even more efficient against false alarms.
- the position switch is or comprises a roller level. With a roller level, derailment can be reliably detected.
- the roller level is configured between the movable element and the rail such as by biasing it with a compression spring to follow the rail, for example.
- a compression spring to follow the rail
- the elevator derailment detection system is configured to detect derailment of an elevator car, a counterweight, or both.
- FIG 1 and 2 schematically illustrate ring-on-a-string
- FIG 3 schematically illustrates the derailment
- FIG schematically illustrates the improved derailment detection system
- FIG shows a detail of the derailment detection ring
- FIG 7 shows a second possibility of electrically
- FIG 4 schematically illustrates the improved derailment
- Electric controller 42 operates different parts of the elevator system 10, such as the elevator motor 41 to rotate pulley 15 for accelerating and braking of elevator car 11, for example.
- Elevator car operator interface 44 and floor level operator interfaces 45 can be used to send commands to electric
- Derailment detection system 40 comprises a modified derailment detection ring 48 and a position switch 54.
- the derailment detection system 40 may be connected to ground fault sensor 43.
- Ground fault sensor 43 may be implemented as part of electric controller 42, or as a separate sensor. In case ground fault sensor 43 detects a ground fault in the derailment detection system 40, the elevator car 11 may stopped or further use of the elevator may be prevented or allowed in emergency mode only.
- counterweight derailment detection in high rise buildings can be improved with the modified derailment detection ring 48 (cf. FIG 5) and by adding the position switch 54 to the derailment detection system 40, in order to eliminate false trips (i.e false safety chain
- the internal surface (inner sleeve 52) of the derailment detection ring 48 is isolated from ground (such as by using electrically isolating material 53) .
- the position switch 54 that most preferably is a safety switch is used to close the circuit for grounding the inner sleeve 52.
- FIG 5 and 6 illustrate the embodiment in which the outer sleeve 51 is be grounded and the position switch 54 is used to connect the grounded outer sleeve 51 to the inner sleeve 52 if the relative position between the position switch 54 and rail 70 indicates that the movable element (elevator car 11 or
- FIG 7 illustrates the embodiment in which the inner sleeve 52 is connected to ground by the position switch 54 if the relative position between the position switch 54 and rail 70 indicates that the movable element (elevator car 11 or counterweight 12) has derailed.
- detection rope 13 is to carry information of the derailment to the ground fault sensor 43 or electric controller 42 located in the machine room of the elevator system 10.
- the roller guide 71 has a spring 74 to apply force on the guide rail 70. If the guide rail 70 is not present, the spring 74 will push the cam 73 forward. This can be detected by position switch 54.
- a safety switch according to European Norm EN 1088, has the task of preventing the operation of the elevator in the case of a hazard.
- a safety circuit 20 must be opened by the safety switch, such as via safety relay switch 23. All mechanical safety switches have at least one positively driven normally closed contact for this purpose.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
An elevator derailment detection system (40)comprises a movable element (11, 12) slidably mounted on a rail (70),an electrical conductor (13) extending through a hoistway (18), the electrical conductor (13) being held at electric potential, and a sensor (40) connected to the movable element (11, 12).The sensor comprises a derailment detection ring (48) enclosing the electrical conductor (13) at the location of the derailment detection ring (48),and a position switch (71, 72, 73, 74, 75, 4) configured to electrically connect the derailment detection ring (48) to a different electric potential if the relative position between the position switch (71, 72, 73, 74, 75, 54) and the rail (70) indicates that the movable element (11, 12) has derailed. The derailment detection ring (48) and the position switch (71, 72, 73, 74, 75, 54) are configured to coactively cause a ground fault at the electrical conductor (13).
Description
Elevator derailment detection system and elevator system comprising the same
Field of the invention
The present invention relates elevators and, in particular, for systems for detecting the railment of a movable element within an elevator.
Background art
Detection of derailment of the elevator counterweight or of the elevator car is required by safety codes, such as by ASME A 17. Derailment detection is an important safety feature. If
derailment were not reliably detected, the derailed
counterweight could potentially hit the elevator car.
In case derailment is detected, the elevator system must either be set to an inoperative state or be operated in emergency mode only .
FIG 1 schematically illustrates an elevator system 10 which comprises at least one elevator shaft 18. In each elevator shaft 18, at least one elevator car 11 is arranged in such a manner that it can be moved up and down in the elevator shaft 18. At least one counterweight 12 is arranged to balance the movement of the elevator car 11. Elevator car 11 and counterweight 12 are connected to each other via at least one hoist 14 (typically cable or belt) that forms a continuous loop around a raotor- driven pulley 15 and another pulley 16.
Currently, the most common solution for counterweight 12 derailment detection is a ring-on-a-string construction
schematically shown in FIG 1. In this construction a derailment detection rope 13 (such as a steel rope) is attached to a powered (by voltage source 22, for example, as illustrated in FIG 2) safety circuit 20 via a relay 21. The derailment
detection rope 13 runs the full elevator shaft 18 length adjacent to the counterweight 12. The counterweight 12 is equipped with a derailment detection ring 17 (made from
conductive material) through which the derailment detection rope 13 runs. If the counterweight 12 falls off the guide rails (not
shown in FIG 1) due to an earthquake, for example, the
derailment detection rope 13 will get in contact with the derailment detection ring 17 thus removing the voltage from relay 21 and therefore opening the safety switch 23 and breaking the safety circuit 20. This solution has been described in more detail in the background art part of Otis Elevator Company international patent application WO 2011/010991 Al .
The disadvantage of this solution is that derailment detection rope 13 has no guidance between the top and bottom ends. This makes the derailment detection rope 13 to swing with wind induced building sway, if the elevator system 10 is installed in a high rise building. The sway can be reduced by increasing the tension in the derailment detection rope 13, but this method is quickly exhausted as the travel gets longer, as explained in WO 2011/010991 Al . This makes this approach unsuitable for high rise buildings.
A more advanced solution for high rise buildings is explained in the detailed description part of international patent
application WO 2011/010991 Al (cf . FIG 3 therein) : The
counterweight 12 is connected to an open derailment detection ring 37 that allows the derailment detection rope 13 to be guided at certain interval d with isolated fixing elements 31 attached to elevator shaft 18. This approach requires a robust fixing and a larger number of fixing elements 31. The robust fixing requires large opening in the derailment detection ring 37, which may permit the derailment detection rope to exit the ring 37 without triggering the safety circuit 20. Furthermore, this approach may be quite sensitive to the installation tolerance of the fixing elements 31. Even a minute installation error may cause the fixing element 31 to hit the derailment detection ring 37 and damage the system.
Objective of the invention
The objective of the invention is to avoid false derailment detection trips that result from swaying of the building by high winds and the like, more reliably than in the traditional ring- on-a-string approach.
This objective can be achieved with an elevator derailment detection system according to patent claim 1, and with an elevator system according to patent claim 10.
The dependent patent claims describe various advantageous and inventive aspects of the elevator derailment detection system.
Advantages of the invention
The elevator derailment detection system according to first aspect of the invention comprises: a) a movable element, such as elevator car or counterweight, slidably mounted on a rail; b) an electrical conductor, such as a steel rope, extending through a hoistway, the electrical conductor being held at electric potential; and c) a sensor connected to the movable element, comprising: cl) a derailment detection ring enclosing the electrical conductor at the location of the derailment detection ring; and c2 ) a position switch configured to electrically connect the derailment detection ring to a different electric potential if the relative position between the position switch and the rail indicates that the movable element has derailed, c3) the derailment detection ring and the position switch configured to coactively cause a ground fault at the electrical conductor; and d) safety circuit configured for detecting ground fault of the electrical conductor.
The elevator derailment detection system can be applied to buildings that are so high that the ring-on-a-string approach would not work, since the detection system is immune to rope sway: only such a derailment that is also detected by a position switch can cause a trip.
The elevator derailment detection system can be implemented with relatively simple mechanical parts. Compared with the Otis
Electrical Company solution presented in WO 2011/010991 Al, the isolated fixing elements may be omitted which may result in easier installation, in particular if the installation
tolerances for installation of the fixing elements do not need to be observed.
If the derailment detection ring comprises a grounded outer sleeve and an inner sleeve, both being electrically conductive, and electrical isolation between them, false trips can be better avoided, since in order to cause a trip either a supplementary connecting of the inner sleeve to the outer sleeve or such a mechanical deformation of the sleeves causing the sleeves to touch each other is necessary.
If the outer sleeve is grounded and the position switch is configured to connect the outer sleeve to the inner sleeve if the relative position between the position switch and the rail indicates that the movable element has derailed.
Alternatively, the position switch may be configured to connect the inner sleeve to the potential of the outer sleeve, if the relative position between the position switch and the rail indicates that the movable element has derailed. This way of operation is even more efficient against false alarms.
Advantageously, the position switch is or comprises a roller level. With a roller level, derailment can be reliably detected.
Preferably the roller level is configured between the movable element and the rail such as by biasing it with a compression spring to follow the rail, for example. In this case, since the derailment of the movable element is detected coactively by the position switch and the electrical conductor such as a steel rope, false trips caused by sway of the building can be better avoided .
Elevator system according to a second aspect of the present invention comprises a number of elevator cars and counterweights in a number of elevator shafts, and an elevator derailment detection system according to the first aspect of the invention or its modifications as discussed above. The elevator derailment
detection system is configured to detect derailment of an elevator car, a counterweight, or both.
List of drawings
Reference will now be made to exemplary embodiments shown in FIG 4 to 7 of the accompanying drawings, of which
FIG 1 and 2 schematically illustrate ring-on-a-string
approach for derailment detection in an elevator;
FIG 3 schematically illustrates the derailment
detection system disclosed in international patent application WO 2011/010991 Al ;
FIG schematically illustrates the improved derailment detection system;
FIG shows a detail of the derailment detection ring; FIG shows a first possibility of electrically
connecting the derailment detection ring to a different electric potential; and
FIG 7 shows a second possibility of electrically
connecting the derailment detection ring to a different electric potential. Same reference numerals refer to same structural elements in all FIG.
Detailed description
FIG 4 schematically illustrates the improved derailment
detection system 40. Electric controller 42 operates different parts of the elevator system 10, such as the elevator motor 41 to rotate pulley 15 for accelerating and braking of elevator car 11, for example.
Elevator car operator interface 44 and floor level operator interfaces 45 can be used to send commands to electric
controller for ordering the elevator car 11 to a particular floor, for example.
Derailment detection system 40 comprises a modified derailment detection ring 48 and a position switch 54. The derailment detection system 40 may be connected to ground fault sensor 43. Ground fault sensor 43 may be implemented as part of electric controller 42, or as a separate sensor. In case ground fault sensor 43 detects a ground fault in the derailment detection system 40, the elevator car 11 may stopped or further use of the elevator may be prevented or allowed in emergency mode only.
According to the invention, counterweight derailment detection in high rise buildings can be improved with the modified derailment detection ring 48 (cf. FIG 5) and by adding the position switch 54 to the derailment detection system 40, in order to eliminate false trips (i.e false safety chain
breakages) caused by sway of rope 13. The internal surface (inner sleeve 52) of the derailment detection ring 48 is isolated from ground (such as by using electrically isolating material 53) .
The position switch 54 that most preferably is a safety switch is used to close the circuit for grounding the inner sleeve 52. FIG 5 and 6 illustrate the embodiment in which the outer sleeve 51 is be grounded and the position switch 54 is used to connect the grounded outer sleeve 51 to the inner sleeve 52 if the relative position between the position switch 54 and rail 70 indicates that the movable element (elevator car 11 or
counterweight 12) has derailed.
FIG 7 illustrates the embodiment in which the inner sleeve 52 is connected to ground by the position switch 54 if the relative position between the position switch 54 and rail 70 indicates that the movable element (elevator car 11 or counterweight 12) has derailed.
In both approaches, the main function of the derailment
detection rope 13 is to carry information of the derailment to the ground fault sensor 43 or electric controller 42 located in the machine room of the elevator system 10.
There is a number of options to perform the function of the actual derailment detection, but one good alternative is to equip the roller guide 71 with position switch 54. The roller guide 71 has a spring 74 to apply force on the guide rail 70. If the guide rail 70 is not present, the spring 74 will push the cam 73 forward. This can be detected by position switch 54.
A safety switch, according to European Norm EN 1088, has the task of preventing the operation of the elevator in the case of a hazard. For this purpose, a safety circuit 20 must be opened by the safety switch, such as via safety relay switch 23. All mechanical safety switches have at least one positively driven normally closed contact for this purpose.
The invention is not to be understood to be limited in the attached patent claims but must be understood to encompass all their legal equivalents and combinations.
Claims
1. An elevator derailment detection system (40), comprising: a) a movable element (11, 12) slidably mounted on a rail
(70) ; b) an electrical conductor (13) extending through a hoist ay
(18), the electrical conductor (13) being held at electric potential; and c) a sensor (40) connected to the movable element (11, 12), comprising : - cl) a derailment detection ring (48) enclosing the
electrical conductor (13) at the location of the derailment detection ring (48); and
- c2) a position switch (71, 72, 73, 74, 75, 54) configured to electrically connect the derailment detection ring (48) to a different electric potential if the relative position between the position switch (71, 72, 73, 74, 75, 54) and the rail (70) indicates that the movable element (11, 12) has derailed,
- c3) the derailment detection ring (48) and the position switch (71, 72, 73, 74, 75, 54) configured to coactively cause a ground fault at the electrical conductor (13); and d) safety circuit (20) configured for detecting ground fault of the electrical conductor (13) .
2. An elevator derailment detection system (40) according to claim 1, wherein: the derailment detection ring (48) comprises a grounded outer sleeve (51) and an inner sleeve (52), both being electrically conductive, and electrical isolation (53) between them .
3. An elevator derailment detection system (40) according to claim 2, wherein: the outer sleeve (51) is grounded and the position switch (71, 72, 73, 74, 75, 54) is configured to
connect the outer sleeve (51) to the inner sleeve (52) if the relative position between the position switch (71, 72, 73, 74, 75, 54) and the rail (70) indicates that the movable element (11, 12) has derailed.
4. An elevator derailment detection system (40) according to claim 2, wherein: the position switch (71, 72, 73, 74, 75, 54) is configured to connect the inner sleeve (52) to the potential of the outer sleeve (51), if the relative position between the position switch (71, 72, 73, 74, 75, 54) and the rail (70) indicates that the movable element (11, 12) has derailed.
5. An elevator derailment detection system (40) according to any one of the preceding claims, wherein: the position switch (71, 72, 73, 74, 75, 54) is or comprises a roller level.
6. An elevator derailment detection system (40) according to any one of the preceding claims, wherein the roller level is configured between the movable element (11, 12) and the rail (70) .
7. An elevator derailment detection system (40) according to claim 6, wherein the roller level is biased with a compression spring (74) to follow the rail (70) .
8. An elevator derailment detection system (40) according to any one of the preceding claims, wherein: the movable element (11, 12) is elevator car (11) or counterweight (12) .
9. An elevator derailment detection system (40) according to any one of the preceding claims, wherein: the position switch (71,
72, 73, 74, 75, 54) is a safety switch.
10. Elevator system comprising a number of elevator cars (11) and counterweights (12) in a number of elevator shafts (18), and an elevator derailment detection system (40) according to any one of the preceding claims, wherein: the elevator derailment detection system (40) is configured to detect derailment of an elevator car (11), a counterweight (12), or both.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FI2013/050558 WO2014188051A1 (en) | 2013-05-22 | 2013-05-22 | Elevator derailment detection system and elevator system comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FI2013/050558 WO2014188051A1 (en) | 2013-05-22 | 2013-05-22 | Elevator derailment detection system and elevator system comprising the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014188051A1 true WO2014188051A1 (en) | 2014-11-27 |
Family
ID=51933000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FI2013/050558 Ceased WO2014188051A1 (en) | 2013-05-22 | 2013-05-22 | Elevator derailment detection system and elevator system comprising the same |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2014188051A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017019236A1 (en) * | 2015-07-27 | 2017-02-02 | Wurtec Elevator Products & Services | Elevator counterweight signaling system |
| WO2018198283A1 (en) * | 2017-04-27 | 2018-11-01 | 三菱電機株式会社 | Derailment detection device for elevators |
| WO2019180910A1 (en) * | 2018-03-23 | 2019-09-26 | 三菱電機株式会社 | Derailment detector for elevator |
| JP2024157194A (en) * | 2023-04-25 | 2024-11-07 | 三菱電機株式会社 | Elevator derailment detection system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4643276A (en) * | 1985-05-02 | 1987-02-17 | Westinghouse Electric Corp. | Elevator system |
| JPS6469485A (en) * | 1987-09-09 | 1989-03-15 | Toshiba Corp | Derailment detector for elevator |
| WO2011010991A1 (en) * | 2009-07-20 | 2011-01-27 | Otis Elevator Company | Building sway resistant elevator derailment detection system |
-
2013
- 2013-05-22 WO PCT/FI2013/050558 patent/WO2014188051A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4643276A (en) * | 1985-05-02 | 1987-02-17 | Westinghouse Electric Corp. | Elevator system |
| JPS6469485A (en) * | 1987-09-09 | 1989-03-15 | Toshiba Corp | Derailment detector for elevator |
| WO2011010991A1 (en) * | 2009-07-20 | 2011-01-27 | Otis Elevator Company | Building sway resistant elevator derailment detection system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017019236A1 (en) * | 2015-07-27 | 2017-02-02 | Wurtec Elevator Products & Services | Elevator counterweight signaling system |
| WO2018198283A1 (en) * | 2017-04-27 | 2018-11-01 | 三菱電機株式会社 | Derailment detection device for elevators |
| JPWO2018198283A1 (en) * | 2017-04-27 | 2019-07-11 | 三菱電機株式会社 | Elevator derailment detection device |
| US11518649B2 (en) | 2017-04-27 | 2022-12-06 | Mitsubishi Electric Corporation | Elevator derailment detecting device |
| WO2019180910A1 (en) * | 2018-03-23 | 2019-09-26 | 三菱電機株式会社 | Derailment detector for elevator |
| JPWO2019180910A1 (en) * | 2018-03-23 | 2020-09-03 | 三菱電機株式会社 | Elevator derail detector |
| JP2024157194A (en) * | 2023-04-25 | 2024-11-07 | 三菱電機株式会社 | Elevator derailment detection system |
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