1. An elevator car roof system (400), comprising:

a plurality of movable ceiling panels (200, 300, 402, 403, 405, 500) forming a roof of an elevator car;

at least one sensor (404, 407, 408) configured to indicate a position of the ceiling (200, 300, 402, 403, 405, 500) and to detect any object on the ceiling, the position comprising at least a first state in which the ceiling is fully closed, a second state in which the ceiling is fully open, and a third state in which the ceiling is partially open;

a control unit (100);

wherein the control unit (100) is configured to enable normal elevator operation only in the first state when no object is detected overhead based on at least one signal received from at least one sensor (404, 407, 408);

wherein the control unit (100) is configured to disable any elevator operation in a third state or when an object is detected overhead based on at least one signal received from at least one sensor (404, 407, 408); and

wherein the control unit (100) is configured to enable elevator inspection drive only in the second state based on at least one signal received from at least one sensor (404, 407, 408).

2. The elevator car roof system (400) of claim 1, wherein the top portion opens when at least one top plate has been rotated away from the plane of the elevator car roof relative to a longitudinal axis of the top plate.

3. The elevator car roof system (400) of any of the preceding claims, wherein the roof is fully open when all of the top plates (200, 300, 402, 403, 405, 500) are rotated relative to the longitudinal axis of the top plates (200, 300, 402, 403, 405, 500) out of the plane of the elevator car roof and to one side of the elevator car roof opening.

4. The elevator car roof system (400) of any of the preceding claims, wherein the roof is fully closed when the top panels (200, 300, 402, 403, 405, 500) are positioned side-by-side on the same plane covering the entire area of the elevator car roof opening.

5. The elevator car roof system (400) of any of the preceding claims, wherein the at least one sensor (404, 407, 408) comprises a first sensor (407), a second sensor (404), and a third sensor (408), the system (400) further comprising:

a frame (401) of the elevator car roof;

a first folding bar (409) movably coupled to one side of the frame;

a second folding bar (406) movably coupled to a side of the frame (401) opposite the first folding bar (409);

wherein the first folding bar (409) is configured to be able to trigger at least one of the first sensor (407) and the second sensor (404); and is

Wherein the second folding bar (406) is configured to be able to trigger the third sensor (408).

6. The elevator car roof system (400) of claim 5, wherein in the first state and when weight is applied on any of the top panels (200, 300, 402, 403, 405, 500), the first folding bar (409) is configured to trigger a first sensor (407).

7. The elevator car roof system (400) of claim 5, wherein in a third state, the first folding bar (409) is configured to trigger the first sensor (407) and the second sensor (404).

8. The elevator car roof system (400) of claim 5, wherein in a second state, the second folding bar (406) is configured to trigger the third sensor (408) to override the first sensor (407) and the second sensor (404) to enable inspection actuation.

9. The elevator car roof system (400) of claim 6, further comprising:

at least one pushing member (503) associated with each top panel, arranged facing said first folding bar (409);

wherein the at least one pushing member (503) is configured to move the first folding bar (409) when a weight is applied in the first state, and in response to the movement, the first folding bar (409) is configured to trigger the first sensor (407).

10. The elevator car roof system (400) of any of claims 6 to 9, wherein the first folding bar (409) extends along an entire side of the frame (401).

11. The elevator car roof system (400) of any of claims 6-10, wherein the second folding bar (406) extends only partially along a side of the frame (401).

12. A control system of an elevator configured to:

receiving at least one signal from at least one sensor (404, 406, 407) of an elevator car roof system (400) of any of claims 1-11; and

controlling operation of the elevator based on the at least one signal.

13. An elevator comprising an elevator car roof system (400) according to any of claims 1-11 and a control system according to claim 12.

Background

In elevators with no or low headroom, the height of the shaft is such that when the elevator car approaches the top landing, people or objects on top of the elevator car will be crushed. For the overall safety of such an elevator, it is necessary to monitor the absence of an inappropriate presence on top of the elevator car when the elevator is operating. One way for such elevators to provide the necessary safety or refuge space for elevator maintenance operations, such as maintenance and inspection of components in the elevator shaft, is to build it inside the elevator car. For example, maintenance may be performed through open car ceilings and roofs, floors or walls, or through open car doors. In this case the permanent natural refuge space is at least partly located inside the elevator car. In the above application, the car inspection drive can be performed from inside the elevator car by using the opened car roof as a service passage into the elevator shaft above the car.

Disclosure of Invention

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

Exemplary embodiments provide an elevator car roof system for providing safe and easy access for elevator maintenance by monitoring the open state of an elevator car roof. In an exemplary embodiment, the elevator car roof system enables detection of objects on top of the elevator car to further improve safety. These benefits may be achieved by the features of the independent claims. Further embodiments are provided in the dependent claims, the description and the drawings.

According to a first aspect, an elevator car roof system is provided. An elevator car roof system includes a plurality of movable roof panels forming an elevator car roof, and at least one sensor configured to indicate a position of the roof panels and detect an object on the at least one roof panel, the position of the roof panels including at least a first state in which the roof is fully closed, a second state in which the roof is fully open, and a third state in which the roof is partially open. The at least one sensor is configured to enable normal elevator operation only in the first state when no object is detected overhead, the at least one sensor is configured to disable any elevator operation in the third state or when an object is detected overhead, and the at least one sensor is configured to enable elevator inspection drive only in the second state.

In an exemplary embodiment, the top part opens when at least one of the top plates has been rotated out of the plane of the top plate of the elevator car relative to the longitudinal axis of the top plate.

In an exemplary embodiment, the roof is fully open when all of the top plates are rotated out of the plane of the elevator car roof relative to the longitudinal axis of the top plates and moved to one side of the elevator car roof opening.

In an exemplary embodiment, wherein the roof is fully closed when the roof panels are positioned side-by-side in the same plane covering the entire area of the elevator car roof opening.

In an exemplary embodiment, the at least one sensor comprises a first sensor, a second sensor, and a third sensor, and wherein the system further comprises a frame of the elevator car roof; the first folding bar is movably coupled to one side of the frame, and the second folding bar is movably coupled to an opposite side of the frame from the first folding bar. The first folding bar is configured to enable triggering of at least one of the first sensor and the second sensor, and the second folding bar is configured to enable triggering of the third sensor.

In an exemplary embodiment, in the first state and when weight is applied on any top panel, the first folding bar is configured to trigger the first sensor.

In an exemplary embodiment, in the third state, the first folding bar is configured to trigger the first sensor and the second sensor.

In an exemplary embodiment, in the second state, the second folding lever is configured to trigger the third sensor to override the first sensor and the second sensor to enable the inspection driving.

In an exemplary embodiment, the system further comprises at least one pushing member associated with each top plate, the pushing member being arranged to face the first folding bar, and wherein, when weight is applied in the first state, the at least one pushing member is configured to move the first folding bar, and in response to the movement, the first folding bar is configured to trigger the first sensor.

In an exemplary embodiment, the first folding bar extends along the entire side of the frame.

In an exemplary embodiment, the second folding bar extends only partially along the sides of the frame.

According to a second aspect, a control system of an elevator is provided. The control system is configured to receive at least one signal from at least one sensor of the elevator car roof system of the first aspect or any exemplary embodiment thereof and to control operation of the elevator based on the at least one signal.

According to a third aspect, an elevator is provided comprising the elevator car roof system of the first aspect and the control system of the second aspect.

Many of the additional features will be better understood as they will become better understood by reference to the following detailed description considered in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the exemplary embodiments and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments and together with the description help to explain the exemplary embodiments. In the drawings:

fig. 1 shows a schematic view of a control system of an elevator including an elevator car roof system according to an exemplary embodiment.

Fig. 2A shows a schematic view of an elevator service aisle when an elevator car roof is fully closed according to an exemplary embodiment.

Fig. 2B shows a schematic view of an elevator service aisle when the elevator car roof is fully open according to an exemplary embodiment.

Fig. 2C shows a schematic view of an elevator service aisle when an object is present on top of an elevator car according to an exemplary embodiment.

Fig. 2D shows a schematic view of an elevator service aisle when the top portion of the elevator car is open according to an exemplary embodiment.

Fig. 3 shows a schematic view of an elevator service aisle depicted from an oblique angle when the elevator car roof is fully open according to an exemplary embodiment.

Fig. 4 shows a schematic view of a monitoring mechanism of an elevator car roof system according to an exemplary embodiment.

Fig. 5 shows a schematic view of a top plate comprising an apparatus for object detection according to an exemplary embodiment.

Fig. 6A shows a schematic diagram of a cross-section of an elevator car roof system when the elevator car roof is fully closed, according to an example embodiment.

Fig. 6B shows a schematic view of an elevator car roof system depicted from above when the elevator car roof is fully closed, according to an exemplary embodiment.

Fig. 6C shows a schematic diagram of a cross-section of an elevator car roof system when the elevator car roof is fully open, according to an example embodiment.

Fig. 6D shows a schematic view of the elevator car roof system depicted from above when the elevator car roof is fully open, according to an exemplary embodiment.

Fig. 7A-7D illustrate a sequence for detecting objects and monitoring the open state of an elevator car roof in an elevator car roof system according to an exemplary embodiment.

Fig. 8A shows a schematic view of a first folding bar in a first position when an elevator car roof is fully closed according to an exemplary embodiment.

Fig. 8B shows a schematic view of the first folding bar in an intermediate position when an object is present on top of the elevator car according to an exemplary embodiment.

Fig. 8C shows a schematic view of the first folding bar in a second position when the elevator car roof is at least partially open according to an exemplary embodiment.

Fig. 8D illustrates a schematic view of the second folding bar in the first position when the elevator car roof is fully open according to an exemplary embodiment.

Fig. 8E illustrates a schematic view of the second folding bar in a second position when the elevator car roof is fully open according to an exemplary embodiment.

Fig. 9 shows a schematic view of a monitoring mechanism of an elevator car roof system according to another exemplary embodiment.

In the drawings, like reference numerals are used to indicate like parts.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. The detailed description provided below in connection with the appended drawings is intended as a description of the present examples and is not intended to represent the only forms in which the present example may be constructed or utilized. The description sets forth the functions of the example and the sequence of steps for constructing and operating the example. However, the same or equivalent functions and sequences may be accomplished by different examples.

According to an exemplary embodiment, an elevator car roof system is provided for monitoring the security of a service aisle located above an elevator car roof. The elevator car roof system can monitor changes in the open state of the elevator car roof. The position of the plurality of top panels can indicate when the elevator car roof is partially open, fully open, or fully closed. The position of the ceiling may cause at least one sensor of the elevator car ceiling system to provide a signal to a control system of the elevator. In addition, the elevator car roof system can detect whether there is an object on the roof. Based on the detected object on the roof, the elevator car roof system can provide at least one signal to enable control of the operation of the elevator. The elevator car roof system can, for example, enable or disable normal operation of the elevator, or enable or disable execution of inspection drives for the elevator.

The monitoring mechanism may include a plurality of roof panels within the frame of the car roof. When the car roof is closed, it can form a platform on top of the car, i.e. on top of the elevator car roof. The roof panels may be separate or connected and may be movable so that they are collapsible or foldable on one end or side of the frame of the elevator car roof. Thus, the elevator car roof can be fully opened to provide service access from inside the elevator car. Furthermore, the stowing or folding of the top panel on one side may be such that when the top is opened, the view of the elevator shaft is not obstructed by the top. Normal operation of the elevator is enabled only when the elevator car roof is fully closed and there are no objects on top of the elevator car. The inspection drive can only be activated when the elevator car roof is fully open. This can be achieved by monitoring the open state of the ceiling and the open state of the elevator car roof, respectively. To enhance safety, the elevator car roof system can also detect objects on the roof and limit operation of the elevator in response to detecting objects on at least one of the panels. This solution can provide a safe and practical service passage from the elevator car to the shaft.

Fig. 1 illustrates a schematic diagram of a control system 104 of an elevator system including an elevator car roof system 100, according to an embodiment. While the control system 104 is shown as a single device, it should be understood that the functionality of the control system 104 may be distributed to multiple devices where applicable.

The control system 104 may comprise a control unit 101, e.g. an elevator controller. The control unit 101 may include at least one processor, such as one or more of various processing devices, e.g., a coprocessor, a microprocessor, a controller, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), processing circuitry with or without an accompanying DSP, or various other processing devices, including integrated circuits such as, for example, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like.

The control unit 101 may further comprise at least one memory. The memory may be configured to store, for example, computer program code or the like, such as operating system software and application software. The memory may include one or more volatile memory devices, one or more non-volatile memory devices, and/or combinations thereof. For example, the memory may be embodied as a magnetic storage device (e.g., hard disk drive, magnetic tape, etc.), an optical magnetic storage device, or a semiconductor memory (e.g., mask ROM, PROM (programmable ROM), EPROM (erasable PROM), flash ROM, RAM (random access memory), etc.).

The control system 104 may include the elevator car roof system 100. The elevator car roof system 104 can include an electrical safety control interface 103, the electrical safety control interface 103 configured to provide signals to the control unit 101. The electrical safety control interface 103 may comprise, for example, one or more sensors or switches connected to the control unit 101. The electrical safety control interface 103 may further include one or more safety input modules configured to detect safety-related switch states of the sensors, such as position switches, safety contacts, magnetic switches, rolling safety switches, and the like. In an exemplary embodiment, the security input module may include instructions to turn on and off the output based on the input conditions and the internal program. The instructions may be stored on a PLC configured in the safety input module, for example. Alternatively, the safety input module may provide an output signal to a separate controller, such as the control unit 101, based on the input conditions. In an embodiment, the control unit 101 may be integrated on one or more security input modules. The electrical safety control interface 103 can further include a communication interface configured to enable the elevator car roof system 100 to send and/or receive information to/from other devices, such as service or maintenance devices.

The elevator car roof system 100 can also include a control mechanism 102 configured to trigger an input signal to the control unit 101 through an electrical safety control interface 103. Control mechanism 102 may include, for example, one or more levers configured to trigger one or more sensors. For example, the lever may be configured to change the state of at least one switch in response to a changed position of one or more levers. The control mechanism 102 may further include a plurality of panels, such as folding panels, hinged swing panels, and/or floating panels. In an exemplary embodiment, the top plate is movably coupled as a separate plate within the frame of the elevator car top. In another exemplary embodiment, the top plates may be connected to each other. The top plate may be associated with at least one sensor such that a changed position of the top plate causes a change in a state of the sensor. Each top plate may be configured to be horizontally and vertically movable or pivotable. In an exemplary embodiment, one or more rods may be provided that are operably coupled to the top plate. The change in position of the top plate may move one or more rods. The elevator car roof system 100 can further include one or more springs coupled with the one or more rods and/or plates for retaining and/or returning the one or more rods and/or plates to a default position.

The functions described herein may be performed, at least in part, by one or more computer program product components (e.g., software components). According to an embodiment, the elevator car roof system includes a processor or processor circuit, such as a microcontroller, that is configured by program code when executed to perform embodiments of the described operations and functions. Alternatively or in addition, the functions described herein may be performed, at least in part, by one or more hardware logic components. By way of example, and not limitation, exemplary types of hardware logic components that may be used include Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), Complex Programmable Logic Devices (CPLDs), Graphics Processing Units (GPUs).

Fig. 2A shows a schematic view of an elevator service aisle when an elevator car roof is fully closed according to an exemplary embodiment.

The elevator car 201 may comprise a car ceiling 202, which is open inside the elevator car 201.

The elevator car roof may include a plurality of individually movable roof panels 200 within the frame of the elevator car roof. In another exemplary embodiment, the top plates may be connected to each other. The plurality of top plates 200 may fill the frame such that they form a uniform surface within the frame. A plurality of top panels 200 may form the exterior surface of an elevator car roof, which may be used for service access. A work platform 203 for service and inspection purposes may be stored inside the elevator car roof, between the car ceiling 202 and the plurality of top plates 200. When the overhead service aisle is closed, service personnel 206 can work on the landing door member 205, for example, with the car door open. The elevator car 201 may also include a car connection plate 207. The car connection plate 207 may provide an interface for internal and external input/output. For example, the car connection plate 207 may connect input signals from sensors coupled with the elevator car roof elements 202, 200 and the elevator control unit. The inspection drive unit 204 may be coupled to the car connection plate 207 by a serviceman 206 to receive information about the status of the elevator and to initiate an inspection mode of the elevator. Normal operation of the elevator may be permitted when the elevator car top service aisle is fully closed.

Fig. 2B shows a schematic view of the elevator service aisle of fig. 2A when the elevator car roof is fully open according to an exemplary embodiment. The multiple top plates 200 can be moved individually or in conjunction with each other and stowed or folded on one side of the elevator car roof opening to open the elevator car roof by a serviceman 206 to form a service passage open to the hoistway. When the top panel is moved away from the plane of the frame, the top panel may be in an open position, preferably orthogonal to the plane of the frame. In the orthogonal position, the top plates can be stored in a small space adjacent to each other and near one end of the frame. The work platform 203 can be folded down from the top of the elevator car to provide a standing platform for the maintenance personnel 206. The elevator car roof service aisle may enable maintenance work to be performed on the shaft components 208 located above the elevator car 201. The shaft component 208 may include, for example, a motor and a counterweight of an elevator.

Stacking the top plate 200 on one end of the elevator car top frame may enable a refuge space to be provided for the serviceman 206 within the elevator car 201. Furthermore, an arrangement with the top panel 200 stowed aside may e.g. provide a wider service passage than an arrangement with a top rising upwards outside the elevator car 201. The stowing of the ceiling 200 aside can further overcome the safety risk because the visibility of the shaft is not obstructed by the top part rising outside the elevator car 201. Good visibility of the elevator shaft is important during upward travel in inspection drive mode. Furthermore, maintenance and inspection operations can be performed more easily than in solutions where the elevator car roof is raised. For example, by sliding and stowing the elevator car roof to one side, a serviceman can replace the ropes and machinery on the car roof with less effort than if the elevator car roof were raised. For a raised roof, the replacement operation would be time consuming, as the roof would need to be completely removed before the replacement is completed. Furthermore, maintenance of the landing door member 205 can be performed through the top service aisle instead of the open elevator doors.

When the inner ceiling 202 and outer elevator car roof are fully open by stowing the top panel 200 aside, normal operation of the elevator can be disabled. The serviceman 206 can switch the inspection mode from the engaged inspection drive unit 204, and after detecting that the elevator car roof is fully opened, the control unit can allow inspection drive via the car connection plate 207.

Fig. 2C and 2D show the elevator 201 of fig. 2A and 2B when the top part of the elevator car is open.

In fig. 2C, a serviceman 206 stands atop the partially closed elevator car on top of the car roof 200A, which is in a closed position in the plane of the car top frame. One or more of the top panels 200B are in an open position stowed aside on one end of the frame. If the elevator 201 moves on top of a person, there is a risk of overwhelming due to insufficient free space above the elevator car. To ensure safety, the panels 200A, 200B may include elements that enable detection of objects on the ceiling. The element may be configured to trigger a signal to the car connection plate 207 informing of the detected object.

The control unit may further ensure that inspection or service drive is only allowed if the service personnel has sufficient refuge space. Thus, the control signal allowing the inspection drive can be triggered only when all the panels 200A, 200B are in the open position and are stowed aside at the same end of the frame. In fig. 2D, the serviceman 206 is working from a narrow opening because the elevator car roof is not fully open. Since the refuge space may not be easily obtained due to the inconvenience of the working space, the inspection driving is disabled for safety.

Fig. 3 shows a schematic view of an elevator service aisle depicted from an oblique angle when the elevator car roof is fully open according to an exemplary embodiment. The elevator service aisle may include a plurality of top panels 300 within an elevator car top frame 301. The dimensions of the top plate 300 may correspond to the width of the frame 301 and to the length of the frame 301 divided by the number of plates 300. The slide rails 304 may be coupled at both sides of the frame 301. The slide rails 304 may be configured on any opposing sides of the frame 304. The top plate 300 may be movable along slide rails 304. The top plate 300 may be further movable relative to its longitudinal axis. Each top plate 300 can be rotated orthogonally relative to the plane of the frame and slid to one end of the frame, respectively. When multiple top panels 300 are stowed aside on one end of the frame 301, an elevator service aisle may be provided for the serviceman 302. The service person 302 can easily perform service operations via the fully open top plate, for example by standing on the working platform 303.

Fig. 4 shows a schematic view of a monitoring mechanism of an elevator car roof system 400 according to an exemplary embodiment. The elevator car roof system 400 can provide an integrated and combined system for monitoring the opening of the roof and detecting personnel on top of the car. The elevator car roof system 400 can be used in NHR (no headroom) elevator applications, for example. The object detection and monitoring of the open state of the elevator car roof can be combined into the same mechanism as described above.

The elevator car roof system 400 can include a frame 401. The elevator car roof system 400 can also include a plurality of movable top plates 402, 403, 405 within the frame 401. In another exemplary embodiment, the top plates may be connected to each other. The top plates 402, 403, 405 may be supported by slide rails on opposite sides of the frame 401. When all the top plates 402, 403, 405 are placed side by side in the plane of the elevator car top frame 401, the elevator car top is fully closed. When the elevator car roof is fully closed, the plurality of top plates 402, 403, 405 completely fill the frame 401. The elevator car roof can be opened by sliding the top panels 402, 403, 405 to one side of the frame 401 and stowing the top panels to the same side. The top plates 402, 403, 405 are pivotable about their longitudinal axes so that they can be stowed in a relatively small space with respect to the space available in their sliding direction.

The top plates 402, 403, 405 may have a rectangular shape with relatively thin side surfaces and wider top and bottom surfaces. The top panel can be in the closed position when the top or bottom surface of the top panel is in the frame plane of the elevator car roof. The top plate may be in the open position when the top and bottom surfaces of the top plate are rotated from the plane of the frame 401 about the longitudinal axis of the top plate within the frame.

The elevator car roof system 400 can include a first folding bar 409 configured below the top panels 402, 403, 405. The first folding bar 409 may be, for example, a longitudinal folding bar plate. The first folding bar 409 may be coupled to one side of the frame 401. The top plates 402, 403, 405 may be coupled from one end thereof to the same side of the frame 401 as the first folding bar 409. The length of the first folding bar 409 may correspond to the length of the side to which the frame 401 is coupled. Thus, the length of the first folding bar 409 may be sufficient to trigger the at least one sensor 404, 407 in response to the tilting of at least one of the top panels 402, 403, 405 or the folding of multiple top panels. At least one top plate tilted or folded away from the plane of the frame 401 may simultaneously push the first folding bar 409 downwards. The top plate may push the first folding bar 409 from the first position to the second position, which may result in the triggering of the open state sensor 407. In response to the triggering of the open state sensor 407, operation of the elevator may be disabled.

In an exemplary embodiment, each ceiling 402, 403, 405 may include one or more elements capable of object detection on one or more ceilings.

In fig. 5, an exemplary ceiling 500 of an elevator car ceiling system 400 is shown from a side view. The side view shows the short end of the top plate 500 coupled to the same side of the frame 401 as the first folding bar 409. Each top panel 500 of the elevator car roof system 400 can include a swing panel 501 coupled to a hinge 502. When the top plate 500 is in the closed position, the swing plate 501 may include at least one pushing member or pin 503 located above the first folding bar 409. In an exemplary embodiment, the swing plate 501 may include two push members or pins 503 on both sides of the short end of the top plate 500. For example, when a person steps on the swing plate 501, one of the pushing pins 503 pushes the first folding lever 409, so that the first folding lever 409 moves or rotates and triggers the sensor 404. The length of the one or more pushing pins 503 may be chosen such that the first folding bar 409 may reach its intermediate position when they are pushed downwards. When the first folding bar 409 is in the intermediate position, only the sensor 404 can be activated, while the sensor 407 remains deactivated. Alternatively, a floating plate may be used instead of the hinged swing plate. Furthermore, one or more springs may be used to return the plate to its original position when the object is removed. The spring may be coupled to the first folding bar 409.

The elevator car roof system 400 can also include a second folding bar 406. The second folding bar 406 may be, for example, a longitudinally folded bar plate. The second folding bar 406 may be positioned on the opposite side of the frame from the first folding bar 409. The length of the second folding bar 406 may be shorter than the length of the first folding bar 409. The second folding bars 406 may partially extend along the length of the sides of the frame 401 such that the stacking end of the top plate 405 is not covered by the second folding bars 406. For example, the second folding bar 406 may start from an end opposite the position from which the top panel 405 is stowed, and it may extend toward the stacking end such that none of the top panels 402, 403, 405 are connected to the second folding bar 406 when all of the top panels 402, 403, 405 are in the stowed position at the end.

The second folding bar 406 may be used to indicate when the elevator car roof is fully open. When all top panels 402, 403, 405 slide and fold at one end of the frame 401, the second folding bar 406 may rotate upward and trigger the fully open sensor 408. The second folding bar 406 may be spring loaded. At least one top panel 402, 403, 405 that is at least partially vertically aligned with the second folding bar 406 may hold the second folding bar 406 in the first position. When the second folding bar 406 is in the first position, the fully open sensor 408 may remain unactuated by the second folding bar 406. In response to the last top panel being disconnected from the second folding bar 406, the spring may release the second folding bar 406 to the second position and trigger the sensor 408.

In contrast to continuously operating object detection devices on the roof of an elevator car, such as sensors on the roof frame, unnecessary stopping of the elevator car can be avoided while still ensuring safety. For example, if a sleeve of a service person is blocking a sensor while working, a continuously operating sensor on the top frame may interrupt the inspection drive. Unnecessary disturbances can be avoided because once it is detected that the roof is fully open, the fully open sensor 408 will override the load on the roof sensor 404 and enable the inspection drive. In addition, since the object detection is implemented by the same electromechanical mechanism as the open state monitoring of the sensor 407, no additional cost is required.

In fig. 4, the top panels 402, 403, 405 may be configured to rotate downward, but in another exemplary embodiment, the described operations may also be implemented in the opposite manner, such that the folding bar may trigger a sensor in response to the top panel opening upward.

Fig. 6A shows a schematic diagram of a cross-section of an elevator car roof system when the elevator car roof is fully closed, according to an embodiment.

The elevator car roof system includes a plurality of roof panels 500 that can form a surface of the elevator car roof surrounded by a frame 401 of the elevator car roof. Each top plate 500 may have the same width, and the total width of the top plates 500 may correspond to the inner length of the frame 401. Each roof 500 may be in the plane of the frame 401 when the elevator car roof is fully closed.

Fig. 6B shows the elevator car roof service aisle depicted from above when the elevator roof is fully closed, according to an embodiment. Each top plate 500 may be longer in one dimension than in another, and the length and width of the plates may depend on the size of the frame 401. The length of the top plate 500 may correspond to the inner width of the frame 401. The ceiling may form a substantially flat surface when the elevator car roof is fully closed.

Fig. 6C shows a schematic diagram of a cross-section of an elevator car roof system when the elevator car roof is fully open, according to an example embodiment. Fig. 6D shows the elevator car roof system depicted from above. When the elevator car roof is fully open, all of the top panels 500 are stowed aside at one end of the frame 401, each tilted to an upright position. When the top panels 500 are stowed, they may be in a substantially vertical position relative to the frame 401. Thus, sufficient space for maintenance can be provided since the elevator car roof can be folded to the side without obstructing the view of the elevator shaft.

The elevator car top system can include a first folding bar 409 for monitoring the partially open state of the car top. The first folding bar 409 may extend through the entire length of the side of the frame 401. The first folding bar 409 may be folded downward in response to the at least one top panel 500 being tilted to the upright position. In response, the first folding bar 409 may trigger a sensor 407, which sensor 407 is configured to disable any movement of the elevator car. The elevator car top system can also include a second folding bar 406 for monitoring the fully open state of the car top. The second folding bar 406 may be coupled at the opposite side of the frame 401 from the first folding bar 409. The length of the second folding bar 406 may be shorter than the length of the side of the frame 401. The second folding bar 406 may be folded upward in response to all of the top panels 500 being stowed aside on one end of the frame 401. The second folding bar 406 may not extend to the stacking end of the top plate 500. The second folding bar 406 may trigger a sensor 408 configured to override the sensors 404 and 407 (i.e., a fully open sensor), thereby enabling inspection actuation of the elevator. The top plate, which is at least partially located on top of the second folding bar 406, may hinder the upward movement of the second folding bar 406. Thus, when all of the top panels are not stowed aside, the sensor 408 may not be triggered.

Fig. 7A-7D illustrate a sequence for detecting objects and monitoring the open state of an elevator car roof in an elevator car roof system according to an exemplary embodiment.

The elevator car roof system can include a plurality of jointly or separately movable roof panels 500 disposed within a frame 401 of the elevator car roof. The elevator car roof system can also include a monitoring mechanism for monitoring the open state of the elevator car roof and an arrangement for object detection, as described above.

In fig. 7A, the elevator car roof is fully closed. Each top panel 500 is in a closed position in the plane of the frame 401, positioned side-by-side in the frame 401. The first folding bar 409 is in a first upward position and the sensors, e.g. switches 404, 407 coupled to the first folding bar 409, are closed. On the opposite side of the first folding bar 409, the second folding bar 406 is in a first position downwards and the switch 408 coupled to the second folding bar 406 is open.

In fig. 7B, the elevator car roof is still fully closed, but a person may be standing on the ceiling 500. The top plate 500 may include a floating plate 501, the floating plate 501 including at least one pushing member or pin 503. The weight on the top plate 500 may cause the at least one push pin 503 to push the first folding bar 409 down to an intermediate position, causing the switch 404 to open. Thus, the elevator car top system can detect objects on the car top in response to a change in the state of the switch 404. In response to the switch 404 being open, operation of the elevator may be disabled. The switches 407 and 408 remain in their initial state and therefore may not allow checking the driving.

In fig. 7C, the at least one top panel 405 is in an open position in which the at least one top panel 405 has been rotated such that a top surface of the top panel is no longer in the plane of the frame 401. One or more pivoting top plates 405 may push the first folding bar 409 down to a second position beyond the intermediate position such that the first folding bar 409 causes both the switch 404 and the switch 407 to open. In response to the state of the switches 404, 407 changing, the elevator car roof system may disable normal operation of the elevator. However, when the at least one top panel 500 remains in the closed position, the switch 408 may remain open and not allow for check actuation. The person on top of the top plate 500 may have left and thus the floating plate 501 may have returned to its original position.

The open and closed states of the switches 404, 407 and 408 are referred to as their connected states, and as part of the elevator safety circuit, the switch 408 in the closed, connected state overrides the switches 404 and 407 to enable inspection driving.

In fig. 7D, all of the top panels 405, 500 within the frame 401 have been rotated and stowed aside on one end of the frame 401. In response to the last top plate sliding off the top of the second folding bar 406, the second folding bar 406 may be lifted and cause the switch 408 to close. When the switch 408 is closed, the elevator car roof system may allow inspection of the drive and normal movement of the elevator may be prohibited.

Fig. 8A shows a schematic view of the first folding bar 409 in a first position when the elevator car roof is fully closed according to an exemplary embodiment. The first folding bar 409 may be maintained in the first position when each top panel 500 and the corresponding swing panel 501 are in a horizontal position in the plane a of the top panel 500. When the first folding lever 409 is in the first position, the first switch 407 may be maintained in a closed state.

Fig. 8B shows a schematic view of the first folding bar in an intermediate position when an object is present on top of the elevator car according to an exemplary embodiment. The weight of the object may cause the swing plate 501 to move from the plane a of the top plate 500. For example, one side of the swing plate 501 may be raised and the other side may be lowered. The changed position of the swing plate 501 may cause the first folding lever 409 to move such that the switch 404 is open but the switch 407 is still closed.

Fig. 8C illustrates a schematic view of the first folding bar in a second position when the elevator car roof is at least partially open, in accordance with an embodiment. The top panel 500 may be opened by being rotated to an upright position. At the same time, the first folding lever 409 may be pushed to the second position by the top plate 500. As shown in fig. 8C, the changed position of the first folding lever 409 may cause the switch 407 (not shown in the drawings) to be turned on while the switch 404 is maintained in an on state.

Fig. 8D illustrates a schematic view of the second folding bar in the first position when the elevator car roof is not fully open according to an exemplary embodiment. At least one top panel 500 in a closed position in the plane of the frame 401 holds the second folding bar 406 in a downward position. The downward position of the second folding bar 406 may maintain a switch 408 coupled with the second folding bar 406 in an open position. Thus, the second folding bar 406 and the coupled switch 408 indicate the position of the ceiling and the elevator car ceiling is not fully open.

Fig. 8E shows a schematic view of the second folding bar 406 in a second position when the elevator car roof is fully open according to an exemplary embodiment. When each top panel 500 is rotated to an upright position and away from the position of the second folding bar 406, none of the top panels 500 may hold the second folding bar 406 in a downward position. Thus, the second folding bar 406 may be raised to the upright position. In the upright position, the second folding bar 406 may allow the switch 408 to close. In response to the switch 408 being closed, inspection driving of the elevator may be enabled.

Fig. 9 shows a schematic view of a monitoring mechanism of an elevator car roof system 900 according to another exemplary embodiment.

The elevator car roof system 900 can include a plurality of separately movable top plates 906, 907 disposed within a frame 908 of the elevator car roof. The top plates 906, 907 may be coupled to slide rails configured on opposite sides of the frame 908. Each top plate may have a relatively thin rectangular shape having side surfaces and top and bottom surfaces. Each of the top plates 906, 907 may be rotated about its longitudinal axis such that the top plate is in a closed position when the top surface of the top plate is in the plane of the frame 908 and in an open position when the top surface of the top plate is not in the plane of the frame 908. The top plates 906, 907 may be rotated 360 degrees, 180 degrees, or preferably at least 90 degrees, for example.

The elevator car roof system 900 can include at least two sensors 903, 904 for monitoring the roof opening. In an exemplary embodiment, at least one of the sensors 903, 904 may be a safety contact. In an embodiment, at least one of the sensors 903, 904 may be a magnetic switch. In an embodiment, at least one of the sensors 903, 904 may be a rolling safety switch.

In an exemplary embodiment, the elevator car roof system 900 can detect that the elevator car roof is fully open when all of the top plates 906, 907 are stowed aside on one end of the frame 908. When all panels 906, 907 are stowed aside at one end, the safety circuit 901 at the top or below the panel stack is closed. The circuit 901 may be coupled to the first sensor 904. When the roof is at least partially closed, the at least one top panel 907 is in a closed position. At least one top panel 907 may close the second safety circuit 902, the second safety circuit 902 being located at the other end of the frame 908 opposite the first safety circuit 901. Closing the second safety circuit 902 may cause the triggering of the second sensor 903. Alternatively, each top panel 906, 907 may be coupled to a separate switch to indicate whether the top panel is closed. The sensors 903, 904 and the respective safety circuits 902, 901 may be coupled to a car connection plate 905 on the frame 908. Input from the sensors 903, 904 may be provided via a connection board 905 to, for example, a control system of the elevator for at least one of enabling normal elevator operation only, enabling inspection elevator drive only, or disabling normal elevator operation.

Any range or device value given herein may be extended or modified without losing the effect sought. Also, any embodiment may be combined with another embodiment unless explicitly allowed.

Although the subject matter has been described in language specific to structural features and/or acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as examples of implementing the claims.

It will be appreciated that the benefits and advantages described above may relate to one embodiment or may relate to several embodiments. Embodiments are not limited to embodiments that solve any or all of the problems or embodiments having any or all of the advantages and benefits. It will also be understood that reference to "an" item may refer to one or more of those items.

The operations described herein may be performed in any suitable order, or simultaneously where appropriate. Aspects of any of the embodiments described above may be combined with aspects of any other embodiments described to form yet other embodiments without losing the effect sought.

The term "comprising" is used herein to mean including the identified method, block, or element, but such block or element does not include an exclusive list, and the method or elevator car roof system may contain additional blocks or elements.

Although topics may be referred to as "first" or "second" topics, this does not necessarily indicate the order or importance of these topics. Rather, these attributes may be used only for the purpose of differentiating between subjects.

It will be understood that the above description is given by way of example only and that various modifications may be made by those skilled in the art. The above specification, examples and data provide a complete description of the structure and use of exemplary embodiments. Although various embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of the claims.