Elevator safety system

Abstract

A safety system (105) for an elevator system (100) is disclosed. The elevator system includes a hoistway (104), an elevator car (102), and a plurality of landing doors (112a-f). The security system (105) includes a first security chain (120), a second security chain (125), and a controller (110). The first safety chain (120) is configured to generate even landing signals, and the second safety chain (125) is configured to generate odd landing signals. The controller (110) is configured to automatically command the elevator system (100) to enter a special mode of operation when generation of the even landing signal and the odd landing signal indicates that the elevator car (102) is located at an even landing and an odd landing door is open or the elevator car (102) is located at an odd landing and an even landing door is open.

Description

Technical Field

[0001] The present disclosure relates to systems and methods for ensuring the safety of maintenance personnel when entering and exiting an elevator hoistway. Background Art

[0002] During the elevator maintenance process, maintenance personnel often need to enter the hoistway of the elevator system to access the drive system, lighting system, sensor system, call system and various other components. To do this, the maintenance personnel enter the hoistway at a landing above or below the elevator car. When the maintenance personnel are in the hoistway and are not protected by not being in the elevator car, additional protection must be provided.

[0003] When maintenance personnel are working in the hoistway, various safety measures should be provided to them. For example, a limit may be set as to how close the elevator car can approach the top of the hoistway. Currently, the elevator system in known systems must be manually placed into maintenance mode by maintenance personnel before they enter the hoistway. If the maintenance personnel forget to perform this step, or if someone other than a maintenance person somehow enters the hoistway, a serious accident may occur.

[0004] Therefore, there is a need for a system that automatically switches the elevator system to a maintenance mode before maintenance personnel enter the hoistway. Summary of the invention

[0005] According to a first aspect of the present disclosure, a safety system for an elevator system is provided, the safety system comprising: a first safety chain, a second safety chain, and a controller communicating with the first safety chain and the second safety chain. The elevator system comprises: a shaft, a plurality of landing doors configured to provide access to the shaft, and an elevator car arranged in the shaft. The first safety chain is configured to: generate an even-numbered landing signal when the elevator car is located at an even-numbered landing and / or when an even-numbered landing door located on an even-numbered landing is opened. The second safety chain is configured to: generate an odd-numbered landing signal when the elevator car is located at an odd-numbered landing and / or when an odd-numbered landing door located on an odd-numbered landing is opened. The controller is configured to: automatically command the elevator system to enter a special operation mode when the generation of the even-numbered landing signal and the odd-numbered landing signal indicates that the elevator car is located at an even-numbered landing and the odd-numbered landing door is open or the elevator car is located at an odd-numbered landing and the even-numbered landing door is open.

[0006] By automatically commanding the elevator system to enter a special operation mode when the generation of even-numbered landing signals and odd-numbered landing signals indicates that the elevator car is located at an even-numbered landing and the door of the odd-numbered landing is open, or when the elevator car is located at an odd-numbered landing and the door of the even-numbered landing is open, the possibility of human error in the startup safety system is reduced. Therefore, the overall safety of the entire elevator system is improved. In addition, it will be appreciated that in most maintenance situations, maintenance personnel will wish to be able to enter and exit the hoistway directly above or directly below the elevator car, so that: when the elevator car is located at an odd-numbered landing, the door of the even-numbered landing will be opened, and vice versa.

[0007] In some examples, the first safety chain is connected to the controller via a wired connection. In some examples, the first safety chain is connected to the controller via a wireless connection.

[0008] In some examples, the second safety chain is connected to the controller via a wired connection. In some examples, the second safety chain is connected to the controller via a wireless connection.

[0009] Wired connections can be more reliable than wireless connections, however, when the connected components are separated by large distances, wireless connections may be more cost-effective and / or easier to install. Thus, each connection type is useful in different scenarios.

[0010] In some examples, the first safety chain includes an even number of sensors and the second safety chain includes an odd number of sensors. The even number of sensors is configured to generate an even number of landing signals when the elevator car is located at an even number of landings and / or when an even number of landing doors are open. The odd number of sensors is configured to generate an odd number of landing signals when the elevator car is located at an odd number of landings and / or when an odd number of landing doors are open.

[0011] In some examples, the even group of sensors includes a plurality of even door sensors configured to generate an even landing signal when an even landing door is opened.

[0012] In some examples, the odd-numbered group of sensors includes a plurality of odd-numbered door sensors configured to generate an odd-numbered landing signal when an odd-numbered landing door is opened.

[0013] In some examples, the even group of sensors includes a plurality of even-numbered landing sensors configured to generate an even-numbered landing signal when the elevator car is located at an even-numbered landing.

[0014] In some examples, the odd group of sensors includes a plurality of odd-numbered landing sensors configured to generate an odd-numbered landing signal when the elevator car is located at an odd-numbered landing.

[0015] In some examples, the special operating mode is a maintenance mode.

[0016] According to another aspect of the present disclosure, an elevator system is provided, the elevator system comprising: a hoistway, an elevator car arranged in the hoistway, a plurality of landing doors, and a safety system according to any one of the above examples, each landing door being located at a corresponding landing and configured to provide access to the hoistway, wherein the elevator car is suitable for traveling to the corresponding landing.

[0017] In some examples, a first safety chain is connected to one or more of the even-numbered landing doors, and a second safety chain is connected to one or more of the odd-numbered landing doors.

[0018] In some examples, when in a special operating mode, the elevator system is configured to deploy a safety brake and / or a safety barrier, and optionally an upper railing, on the elevator car.

[0019] By deploying additional safety mechanisms, such as safety brakes, safety barriers, or upper railings, the likelihood of injury to maintenance personnel while performing maintenance procedures, such as maintenance or inspections, in or around the hoistway is reduced.

[0020] In some examples, the elevator car cannot move while in the special operating mode.

[0021] By preventing the elevator car from moving during special operating modes, the possibility of injury to service personnel while performing service procedures such as maintenance or inspections in or around the hoistway is reduced.

[0022] According to another aspect of the present disclosure, a method for operating a safety system for an elevator system is provided. The safety system includes: a first safety chain, a second safety chain, and a controller communicating with the first safety chain and the second safety chain. The elevator system includes: a shaft, a plurality of landing doors configured to provide access to the shaft, and an elevator car arranged in the shaft. The method includes: in response to the opening of the landing door at an even-numbered landing or the arrival of the elevator car at an even-numbered landing, the first safety chain generates an even-numbered landing signal; in response to the opening of the landing door at an odd-numbered landing or the arrival of the elevator car at an odd-numbered landing, the second safety chain generates an odd-numbered landing signal; and when the generation of the even-numbered landing signal and the odd-numbered landing signal indicates that the elevator car is located at an even-numbered landing and the odd-numbered landing door is open or the elevator car is located at an odd-numbered landing and the even-numbered landing door is open, the controller automatically commands the elevator system to enter a special operation mode.

[0023] In some examples, the controller automatically commands the elevator system to enter a special operating mode in response to receiving an even landing signal and an odd landing signal simultaneously.

[0024] In some examples, the controller automatically commands the elevator system to enter a special operating mode in response to the presence of both the even landing signal and the odd landing signal.

[0025] In some examples, the first safety chain includes an even number of sensors and the second safety chain includes an odd number of sensors. The method further includes: the even number of sensors indicates that an even number of landing doors have been opened or that the elevator car has arrived at an even number of landings; in response to the even number of sensors indicating that an even number of landing doors have been opened or that the elevator car has arrived at an even number of landings, the first safety chain generates an even number of landing signals; the odd number of sensors indicates that an odd number of landing doors have been opened or that the elevator car has arrived at an odd number of landings; and in response to the odd number of sensors indicating that an odd number of landing doors have been opened or that the elevator car has arrived at an odd number of landings, the second safety chain generates an odd number of landing signals.

[0026] In some examples, the method further includes, in response to being commanded to enter the special operating mode, the elevator system deploying a safety brake and / or an upper railing on the elevator car.

[0027] According to another aspect of the present disclosure, a computer program product is provided, which is used for a controller of a safety system as described above, and the computer program product includes instructions, which, when executed by a processor, cause the controller to perform operations, the operations including: in response to receiving an even-numbered landing signal and an odd-numbered landing signal, commanding the elevator system to enter a special operating mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of an elevator system in a building;

[0029] Figure 2 is a schematic diagram of a security system according to at least one example of the present disclosure;

[0030] Figure 3 yes Figure 2 a schematic diagram of a portion of a safety system; and

[0031] Figure 4 is a diagram of a method according to at least one example of the present disclosure. DETAILED DESCRIPTION

[0032] Figure 1 and Figure 2An elevator system 100 including an elevator car 102 in a hoistway 104 is shown. In an embodiment, the elevator system 100 can meet the PESSRAL (Programmable Electronic System in Safety-Related Applications of Elevators) standard. The elevator car 102 is configured to move upward and downward in the hoistway 104 to transport passengers between different landings 11a-11f in the building 10. It will be understood that the building usually includes a plurality of different floors, and each floor can have a landing from which the hoistway can be entered and exited. The interval landings at which the elevator car is configured to stop can be referred to as even-numbered landings, and the interval landings between the corresponding even-numbered landings can be referred to as odd-numbered landings. Although not shown in the accompanying drawings, it will be appreciated that the elevator system 100 can include other standard components, including but not limited to: drive, tension member, counterweight, power supply and control panel.

[0033] like Figure 2 As seen in Figure 1 1, but some elements are shown in more detail, the elevator system 100 includes a plurality of landing doors 112a-f. Each landing door 112a in the plurality of landing doors 112a-f is located on a different corresponding landing 11a. The plurality of landing doors 112a-f provide access to the shaft 104 when opened. When the landing door 112a on the landing 11a is closed, the shaft 104 cannot be accessed from the corresponding landing 11a. It will be understood that when the elevator car 102 is located at the corresponding landing 11a-f and when both the elevator car door (not shown) and the landing door 112a are opened, the elevator car 102 can also be accessed via any one of the plurality of landing doors 112a-f.

[0034] The plurality of landing doors 112a-f include one or more even-numbered landing doors located on even-numbered landings of the building 10 and one or more odd-numbered landing doors located on odd-numbered landings of the building 10. The even-numbered landings of the building 10 are landings with even numbers (i.e., floors 0, 2, 4, 6, etc.). The odd-numbered landings of the building 10 are landings with odd numbers (i.e., floors 1, 3, 5, 7, etc.).

[0035] The elevator system 100 includes a safety system 105. The safety system 105 ensures the safety of maintenance personnel while working in the hoistway 104. The safety system 105 includes a controller 110. The elevator system 100 may include additional controllers, each performing a different function to facilitate the operation of the elevator system 100.

[0036] It will be understood that maintenance personnel are personnel responsible for performing maintenance actions on the elevator system. They differ from non-maintenance personnel only in that the actions they perform on the elevator system are beyond what would be considered "normal use". Actions that may be performed by maintenance personnel include, but are not limited to, inspection and / or maintenance of the elevator system.

[0037] The safety system 105 includes a first safety chain 120. The first safety chain 120 is connected to the controller 110 so that the controller 110 can receive an even-numbered landing signal from the first safety chain 120. The first safety chain 120 is connected to one or more landing doors 112a, 112c, 112e located on even-numbered landings 11a, 11c, 11e of the building 10. The first safety chain 120 can be connected to the one or more landing doors 112a, 112c, 112e via sensors, as will be further described below.

[0038] The first safety chain 120 is configured to transmit an even-numbered landing signal to the controller 110 when any one of the one or more even-numbered landing doors 112a, 112c, 112e is opened. The first safety chain 120 is also configured to transmit an even-numbered landing signal to the controller 110 when the elevator car 102 is located at any one of the even-numbered landings 11a, 11c, 11e.

[0039] The safety system 105 includes a second safety chain 125. The second safety chain 125 is connected to the controller 110 so that the controller 110 can receive an odd-numbered landing signal from the second safety chain 125. In an embodiment, the second safety chain 125 is connected to one or more landing doors 112b, 112d, 112f located on odd-numbered landings 11b, 11d, 11f of the building 10.

[0040] The second safety chain 125 is configured to transmit an odd-numbered landing signal to the controller 110 when any one of the one or more odd-numbered landing doors 112b, 112d, 112f is opened. The second safety chain 125 is also configured to transmit an odd-numbered landing signal to the controller 110 when the elevator car 102 is located at any one of the odd-numbered landings 11b, 11d, 11f.

[0041] In an example, the first safety chain 120 includes an even-numbered set of sensors 130. Each sensor in the even-numbered set of sensors 130 may be physically adjacent to a respective one of the one or more even-numbered landing doors 112a, 112c, 112e.

[0042] When any one of one or more even-numbered landing doors 112a, 112c, 112e is opened, or when the elevator car 102 is located at any one of the even-numbered landings 11a, 11c, 11e, the even-numbered array sensor 130 automatically generates an even-numbered landing signal, which is transmitted to the controller 110 by the first safety chain 120.

[0043] In an example, the second safety chain 125 includes an odd-numbered set of sensors 135. Each sensor in the odd-numbered set of sensors 135 may be physically adjacent to a respective one of the one or more odd-numbered landing doors 112b, 112d, 112f.

[0044] When any one of one or more odd-numbered landing doors 112b, 112d, 112f is opened, or when the elevator car 102 is located at any one of the odd-numbered landings 11b, 11d, 11f, the odd-numbered array sensor 135 automatically generates an odd-numbered landing signal, which is transmitted to the controller 110 by the second safety chain 125.

[0045] like Figure 3 As seen in FIG. 1 , which shows a portion of a common safety chain common to both the first safety chain 120 and the second safety chain 125, in the example, the even group sensor 130 includes a plurality of even door sensors 132 and a plurality of even floor station sensors 134, and the odd group sensor 135 includes a plurality of odd door sensors 136 and a plurality of odd floor station sensors 138.

[0046] In the example, the plurality of even door sensors 132 are configured to generate an even-numbered landing signal when any one of the even-numbered landing doors 112a, 112c, 112e is opened, and the plurality of odd-numbered door sensors 136 are configured to generate an odd-numbered landing signal when any one of the odd-numbered landing doors 112b, 112d, 112f is opened.

[0047] In some examples, the plurality of even door sensors 132 include a plurality of override switches (not shown). The plurality of override switches are configured to automatically generate an even landing signal when the even landing doors 112a, 112c, 112e are opened by manual override. The manual override may include a maintenance person overriding a landing door locking mechanism to open the even landing doors 112a, 112c, 112e when the elevator car 102 is not located at a landing 11a, 11c, 11f associated with the even landing doors 112a, 112c, 112e.

[0048] In any example, the plurality of override switches may each include an electrical contact (not shown) that is opened or closed such that: when the contact is closed, current can flow through the contact, and when the contact is opened, no current can flow through the contact. The controller 110 may be configured to command the elevator system 100 to automatically enter a special operating mode when no current is received from the first safety chain 120 and no current is received from the second safety chain 125, such as when the contacts of one override switch have been opened (indicating that the even-numbered landing door has been opened by manual override and thus no current is provided via the first safety chain 120) and the second safety chain 125 indicates that the elevator car 102 is located at an odd-numbered landing.

[0049] In some examples, the plurality of override switches generate an even landing signal in response to a maintenance person inserting a key into a lock and turning the key in the lock. In an example, turning the key in the lock may move the contacts to an open position so that no current may flow through the contacts. In other examples, the plurality of override switches may generate an even landing signal in response to a maintenance person pressing a button or entering a code into a numeric keypad. In an example, pressing the button or entering the code may move the contacts to an open position so that no current may flow through the contacts. In an alternative example, turning the key, pressing the button, or entering the code may move the contacts to a closed position so that current may flow through the contacts.

[0050] Additionally or alternatively, in some examples, the plurality of odd door sensors 136 include a plurality of override switches (not shown). The plurality of override switches are configured to automatically generate an odd landing signal when a maintenance person overrides the landing door locking mechanism to open the odd landing door when the elevator car 102 is not located at a landing associated with the odd landing door.

[0051] In some examples, the plurality of override switches generate an odd landing signal in response to a maintenance person inserting a key into a lock and turning the key in the lock. In an example, turning the key in the lock may move the contacts to an open position so that no current may flow through the contacts. In other examples, the plurality of override switches may generate an odd landing signal in response to a maintenance person pressing a button or entering a code into a numeric keypad. In an example, pressing the button or entering the code may move the contacts to an open position so that no current may flow through the contacts. In an alternative example, turning the key, pressing the button, or entering the code may move the contacts to a closed position so that current may flow through the contacts.

[0052] In an example, the plurality of even-numbered landing sensors 134 include a plurality of proximity sensors (not shown). The plurality of proximity sensors are configured to generate an even-numbered landing signal in response to the elevator car 102 being located at an even-numbered landing. In some examples, the plurality of proximity sensors may be disposed within the shaft 104 so that they detect when the elevator car 102 is located at an even-numbered landing. In other examples, the plurality of proximity sensors may be connected to an elevator control system that provides updates about the position of the elevator car 102 to the plurality of proximity sensors.

[0053] In an example, the plurality of odd-numbered landing sensors 138 include a plurality of proximity sensors (not shown). The plurality of proximity sensors are configured to generate an odd-numbered landing signal in response to the elevator car 102 being located at an odd-numbered landing. In some examples, the plurality of proximity sensors may be disposed within the shaft 104 so that they detect when the elevator car 102 is located at an odd-numbered landing. In other examples, the plurality of proximity sensors may be connected to an elevator control system that provides updates about the location of the elevator car 102 to the plurality of proximity sensors.

[0054] In some examples, the even landing signal and the odd landing signal include variations of normal outputs from the even group of sensors 130 and the odd group of sensors 135 , respectively.

[0055] In an example, the normal output from the even array sensor 130 and the odd array sensor 135 may be a positive signal. In an example, the positive signal may be the flow of electrical current. In other examples, the positive signal may be a constant stream of data transmitted wirelessly. In such an example, the even floor station signal and the odd floor station signal may include that electrical current is no longer flowing, or that the constant stream of data transmitted wirelessly is interrupted.

[0056] In other examples, the normal output from the even array sensor 130 and the odd array sensor 135 may be a negative signal. In an example, the negative signal may be: a lack of current flow or a lack of wirelessly transmitted data. In such an example, the override signal may include: a flow of current or a stream of wirelessly transmitted data.

[0057] In an example, the plurality of proximity sensors and the plurality of override sensors may both generate an even landing signal or an odd landing signal. In an example where the even landing signal and / or the odd landing signal include an electrical current no longer flowing, the even landing signal and / or the odd landing signal may be generated by a break in a circuit at the plurality of proximity sensors and / or the plurality of override sensors.

[0058] In an example, the controller 110 monitors the first safety chain 120. The controller 110 may monitor the current flowing through the first safety chain 120 so that it can detect when an even landing signal is generated.

[0059] In an example, the controller 110 monitors the second safety chain 125. The controller 110 monitors the current flowing through the second safety chain 125 so that it can detect when an odd landing signal is generated.

[0060] In normal operation, at least in some examples, current will flow through at least one of the first safety chain 120 and the second safety chain 125 at any time. In normal operation, when the elevator car 102 is stopping at a landing to serve a landing call, the landing door will only open at the landing where the elevator has stopped, so that the controller 110 will only receive one of the even landing signal and the odd landing signal at any one time. However, in some examples, if the controller 110 receives both the even landing signal and the odd landing signal (e.g., when current does not flow through any one of the first safety chain 120 and the second safety chain 125), the controller 110 automatically causes the elevator system 100 to enter a special operating mode. In some examples, the controller 110 is configured to automatically command the elevator system 100 to enter a special operating mode in response to both the even landing signal and the odd landing signal being present.

[0061] In an example, the special operating mode is a maintenance mode. In an embodiment, the maintenance mode is a maintenance mode and / or an inspection mode associated with the PESSRAL safety system.

[0062] In the special operating mode, it is assumed that maintenance personnel are working in the hoistway 104. Therefore, when the elevator system 100 is in the special operating mode, additional safety measures are implemented to protect the maintenance personnel.

[0063] In some examples, when in the special operating mode, the elevator system 100 is configured to: prevent the elevator car 102 from moving. The elevator system 100 can deploy safety brakes and / or safety barriers, such as upper railings disposed on top of the elevator car 102. The upper railings can prevent maintenance personnel working on top of the elevator car 102 from falling into the hoistway 104. The safety brakes can prevent the elevator car 102 from moving and can not be overridden before the elevator system 100 re-enters the normal mode.

[0064] In some examples, when the elevator system 100 is in a special operating mode, elevator call buttons on landings in a building are disabled.

[0065] In some examples, when the special operating mode is automatically entered, a safety distance limit between the top of elevator car 102 and the top of hoistway 104 is set, and elevator car 102 is prevented from moving toward the top of hoistway 104 beyond the limit.

[0066] In some examples, when entering a special operating mode, the elevator system 100 can deploy additional lighting systems and sound systems to any one of the hoistway 104, the elevator car 102, and the plurality of landing doors 112a-f. The lighting system and the sound system can remind people nearby that maintenance is being carried out and can assist maintenance personnel in performing their duties.

[0067] When in the special operating mode, the elevator system 100 is in a safe state for entering and exiting the hoistway 104 and performing service procedures such as maintenance or inspection.

[0068] In some examples, the controller 110 can command the elevator system 100 to return to normal mode. In such examples, when the controller 110 no longer receives any one of the even-numbered landing signals and the odd-numbered landing signals, the controller 110 can command the elevator system 100 to re-enter the normal operating mode. In other examples, when a normal output is received from any one of the even-numbered array sensors 130 and the odd-numbered array sensors 135, the controller 110 can command the elevator system 100 to re-enter the normal operating mode.

[0069] In some examples, a plurality of override switches may generate a normal output in response to removal of a key from the lock.

[0070] In other examples, elevator system 100 may return to normal mode following additional instructions from maintenance personnel.

[0071] Also made public Figure 4 , Figure 4 A method 300 of operating the safety system 105 of the elevator system 100 described above is depicted.

[0072] The method 300 includes the first safety chain 120 generating an even landing signal in response to an even landing door being opened or in response to the elevator car 102 arriving at an even landing (step 302). In an example, the even set of sensors 130 may generate the even landing signal.

[0073] The method 300 further includes the second safety chain 125 generating an odd landing signal in response to the odd landing door being opened or in response to the elevator car 102 arriving at an odd landing (step 304). In an example, the odd set of sensors 135 may generate the odd landing signal.

[0074] Method 300 also includes: the controller 110 automatically commands the elevator system 100 to enter the special operation mode in response to the controller 110 receiving both the even-numbered landing signal and the odd-numbered landing signal (step 306). In the example, the controller 110 automatically commands the elevator system 100 to enter the special operation mode in response to the controller 110 simultaneously receiving both the even-numbered landing signal and the odd-numbered landing signal. In some examples, "automatic command" is considered to mean "immediate command". In some examples, the controller 110 automatically commands the elevator system 100 to enter the special operation mode in response to both the even-numbered landing signal and the odd-numbered landing signal being present.

[0075] In the example, the method 300 further includes: the elevator system 100 deploys additional safety measures in response to entering the special operating mode (step 308). In some examples, the additional safety measures include: deploying a safety brake on the elevator car 102; activating a lighting system and a sound system in the hoistway 104, on the elevator car 102, or at the plurality of landing doors 112a-f; and deploying a guardrail on the elevator car 102, which may be an upper railing.

[0076] In an example, the method 300 further includes: the controller 110 commands the elevator system 100 to re-enter the normal operation mode in response to the first safety chain 120 and / or the second safety chain 125 no longer generating an even-numbered landing signal or an odd-numbered landing signal, respectively (step 310). In some examples, the method 300 further includes: the controller 110 commands the elevator system 100 to re-enter the normal operation mode in response to the first safety chain 120 and / or the second safety chain 125 generating a normal output.

[0077] Those skilled in the art will appreciate that the present disclosure has been illustrated by describing one or more examples thereof, but the present disclosure is not limited to these examples; many variations and modifications are possible within the scope of the appended claims. For example, the elevator car may be used in a roped or ropeless elevator system or another type of transportation system.

Claims

1. A safety system (105) for an elevator system (100), the safety system comprising: First safety chain (120); Second safety chain (125); as well as a controller (110) in communication with the first safety chain and the second safety chain, The elevator system comprises: a hoistway (104), a plurality of landing doors (112a-f) configured to provide access to the hoistway, and an elevator car (102) disposed in the hoistway. The first safety chain is configured to generate an even-numbered landing signal when the elevator car is located at an even-numbered landing (11a, 11c, 11e) and / or when an even-numbered landing door (112a, 112c, 112e) located at an even-numbered landing is opened. The second safety chain is configured to generate an odd-numbered landing signal when the elevator car is located at an odd-numbered landing (11b, 11d, 11f) and / or when an odd-numbered landing door (112b, 112d, 112f) located on an odd-numbered landing is opened. Wherein, the controller is configured to automatically command the elevator system to enter a special operating mode when the generation of the even-numbered landing signal and the odd-numbered landing signal indicates that the elevator car is located at an even-numbered landing and the door of the odd-numbered landing is open or the elevator car is located at an odd-numbered landing and the door of the even-numbered landing is open.

2. The security system (105) of claim 1, wherein: The first safety chain (120) is connected to the controller (110) via a wired connection or via a wireless connection, and / or Wherein, the second safety chain (125) is connected to the controller via a wired connection or via a wireless connection.

3. The security system (105) according to claim 1 or 2, wherein: The first safety chain (120) includes an even number of sensors (130), and the second safety chain includes an odd number of sensors (135), The even-numbered array of sensors is configured to generate the even-numbered landing signal when the elevator car (102) is located at an even-numbered landing (11a, 11c, 11e) and / or when an even-numbered landing door (112a, 112c, 112e) is opened, and The odd-numbered array of sensors is configured to generate the odd-numbered landing signal when the elevator car is located at an odd-numbered landing (11b, 11d, 11f) and / or when an odd-numbered landing door (112b, 112d, 112f) is opened.

4. The security system (105) of claim 3, wherein: The even-numbered group of sensors (130) includes a plurality of even-numbered door sensors (132), wherein the plurality of even-numbered door sensors (132) are configured to: generate an even-numbered landing signal when an even-numbered landing door (112a, 112c, 112e) is opened, and / or The odd-numbered array of sensors (135) includes a plurality of odd-numbered door sensors (136), and the plurality of odd-numbered door sensors (136) are configured to generate an odd-numbered landing signal when an odd-numbered landing door (112b, 112d, 112f) is opened.

5. The security system (105) according to claim 3 or 4, wherein: The even-numbered group of sensors (130) includes a plurality of even-numbered landing sensors (134), wherein the plurality of even-numbered landing sensors (134) are configured to: generate an even-numbered landing signal when the elevator car (102) is located at an even-numbered landing (11a, 11c, 11e), and / or The odd-numbered array of sensors (135) includes a plurality of odd-numbered floor sensors (136), and the plurality of odd-numbered floor sensors (136) are configured to generate odd-numbered floor signals when the elevator car is located at an odd-numbered floor (11b, 11d, 11f).

6. The safety system (105) according to any one of the preceding claims, wherein: The special operating mode is a maintenance mode.

7. An elevator system (100), comprising: Well (104); An elevator car (102) disposed in the hoistway; a plurality of landing doors (112a-f), each landing door being located at a respective landing (11a-11f) and configured to provide access to the hoistway, wherein the elevator car is adapted to travel to the respective landing; as well as The safety system (105) according to any of the preceding claims.

8. The elevator system (100) according to claim 7, wherein: The first safety chain (120) is connected to one or more of the even-numbered landing doors (112a, 112c, 112e), and the second safety chain (125) is connected to one or more of the odd-numbered landing doors (112b, 112d, 112f).

9. The elevator system (100) according to claim 7 or 8, wherein: When in the special operating mode, the elevator system is configured to deploy a safety brake and / or a safety barrier, and optionally an upper railing, on the elevator car (102).

10. The elevator system (100) according to claim 7, 8 or 9, wherein: When in the special operating mode, the elevator car (102) cannot move.

11. A method (300) of operating a safety system (105) for an elevator system (100), the safety system comprising: First safety chain (120); Second safety chain (125); and a controller (110) in communication with the first safety chain and the second safety chain; The elevator system includes: a hoistway (104), a plurality of landing doors (112a-f) configured to provide access to the hoistway, and an elevator car (102) disposed in the hoistway; The method comprises: In response to the landing door (112a, 112c, 112e) at the even-numbered landing opening or the elevator car arriving at the even-numbered landing (11a, 11c, 11e), the first safety chain generates an even-numbered landing signal; In response to the landing door (112b, 112d, 112f) at the odd-numbered landing opening or the elevator car arriving at the odd-numbered landing (11b, 11d, 11f), the second safety chain generates an odd-numbered landing signal; and When the generation of the even-numbered landing signal and the odd-numbered landing signal indicates that the elevator car is at an even-numbered landing and the odd-numbered landing door is open or the elevator car is at an odd-numbered landing and the even-numbered landing door is open, the controller automatically commands the elevator system to enter a special operation mode.

12. The method according to claim 11, wherein: The controller (110) automatically commands the elevator system (100) to enter the special operation mode in response to: simultaneously receiving the even-numbered landing signal and the odd-numbered landing signal; and / or Both the even-numbered landing signal and the odd-numbered landing signal exist.

13. The method (300) according to claim 11 or 12, wherein: The first safety chain (120) includes an even number of sensors (130), and the second safety chain (125) includes an odd number of sensors (135); The method further comprises: In response to the even-numbered group of sensors indicating that an even-numbered landing door (112a, 112c, 112e) has been opened or the elevator car (102) has arrived at an even-numbered landing (11a, 11c, 11e), the first safety chain generates the even-numbered landing signal; and In response to the odd group of sensors indicating that the odd landing doors (112b, 112d, 112f) have been opened or the elevator car has arrived at an odd landing (11b, 11d, 11f), the second safety chain generates the odd landing signal.

14. The method (300) according to any one of claims 11, 12 or 13, comprising: In response to being commanded to enter the special operating mode, the elevator system (100) deploys a safety brake and / or a safety barrier, and optionally an upper railing, on the elevator car (102).

15. A computer program product for a controller (110) of a security system (105) according to any one of claims 1 to 10, the computer program product comprising instructions which, when executed by a processor, cause the controller to perform operations comprising: In response to receiving the even landing signal and the odd landing signal, the elevator system is commanded to enter a special operating mode.

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