WO2022124534A1

WO2022124534A1 - Device for automatic prevention of elevator hoistway fall

Info

Publication number: WO2022124534A1
Application number: PCT/KR2021/011688
Authority: WO
Inventors: 이기랑; 이준봉; 서현국; 이길상
Original assignee: (주)대륜엘리스
Priority date: 2020-12-09
Filing date: 2021-08-31
Publication date: 2022-06-16
Also published as: KR102251663B1

Abstract

The present invention relates to a device for the automatic prevention of elevator hoistway falls, the device comprising a car detection unit and a control unit, in addition to a support, a safety net, a mounting frame, a wire, and a winding device, and having the benefits of enabling easy installation in an elevator hoistway, preventing falls of workers, materials, tools, etc., and automatically preventing falling accidents whilst allowing an elevator car to ascend and descend, thus minimizing the number of management personnel and enabling convenient usage.

Description

Elevator hoistway fall prevention device

The present invention relates to an automatic elevator hoistway fall prevention device, and more particularly, it is easy to install on the elevator hoistway, and prevents the fall of workers, work materials, and work tools through the hoistway and openings, and automatically the elevator car It relates to an automatic elevator hoistway fall prevention device that enables convenient use while minimizing the number of management personnel by preventing a fall accident while allowing the hoisting of the elevator.

In general, an elevator is an elevator that is installed in a multi-storey building structure such as a shopping mall, a building or an apartment, and carries passengers or cargo to a desired floor. , installed in the elevator hoistway to receive the driving force of the motor in the machine room and ascend and descend as the hoisting rope is wound or unwound, and an elevator car having a door that can be opened and closed, and a counterweight fixed to the end of the hoisting rope to balance the elevator car And, a pair of guide rails fixed in the elevator hoistway to guide when the elevator car goes up and down, and a platform door that is installed to be able to open and close at the entrance of the elevator hoistway.

On the other hand, in the elevator hoistway before the installation of the elevator at the construction site, there are many dangers that threaten life due to a fall or electric shock. Although it is mandatory to install a shielding tent to prevent the fall of workers, work materials, and tools at the openings on each floor of the elevator hoistway, there are cases in which the openings are opened due to non-compliance. Although seat belts are to be fastened on lifelines, there are many workers who do not observe them well. Therefore, due to such carelessness and negligence, the fall of the worker through openings on each floor of the elevator and the fall of the worker through the hoistway is a serious problem directly linked to life. It is necessary to install a safety facility to prevent such a fall immediately after the frame is completed and before the elevator installation work begins.

On the other hand, there are many dangers that threaten life due to falls and electric shocks at the work site of construction sites. In particular, the fall of the worker, work material, work tool, etc. is a problem directly connected to the life of the worker. In particular, it is necessary to install a safety facility to prevent a worker from falling through an elevator hoistway and an opening.

As a technique for preventing a fall accident through a conventional elevator hoistway, the "elevator hall fall prevention device" of Korean Utility Model No. 20-0452279 has been proposed, which includes a multi-structured fall prevention net; a frame part installed to span the inner wall of the hall; In the elevator hall fall prevention device for preventing a fall into the elevator hall having a wall fixing bracket that supports the impact applied to the frame, the center is folded and the length of the horizontal and vertical planes can be adjusted, wherein the frame is left / It consists of a right horizontal support and left/right vertical support, and the support surface and the protruding surface are formed with a step difference of different heights in the coupling part so that the center of the left/right horizontal support is folded, so that the support surface and the protruding surface are mutually It is formed to be engaged and coupled, the protruding surfaces are formed to be folded and unfolded by coupling with an axis bolt, and a length adjustment bundle part is configured on the left/right vertical support to adjust the length, and the left/right vertical support is configured The length adjustment bundle part is configured such that a screw thread formed between the front/rear support and the front/rear support is configured in the adjustment rod to adjust the length of the front/rear support by the rotation of the adjustment rod.

However, such a prior art has a problem of hindering the efficient arrangement of workers by making it difficult for the elevator car to pass through, limiting the installation location in the elevator hall, and causing inconvenience to installation and management.

In particular, in the past, the machine room that drives and controls the elevator was located in a separate space on the roof of the building. The MRL (Machine Room Less)-driven elevator, which installs the elevator machine room at the top of the hoistway without a separate construction, continues to spread throughout the world as well as in Korea. However, such an MRL elevator installation method is the first at a given location at the top of the elevator hoistway (installing a piano wire from the top floor to the bottom pit to install guide rails, opening/closing doors, etc.) and actuator installation work. Although the worker climbs on the scaffolding above the installed scaffolding ladder and works, it is a very dangerous structure that a fall-prevention safety net cannot be installed in the hoistway under the scaffolding for such work. There is a risk of death by falling to the bottom of a hoistway pit if the person falls while working without being hung on a lifeline.

In order to solve the problems of the prior art as described above, the present invention facilitates installation on an elevator hoistway, prevents workers, work materials, and work tools from falling through the hoistway and openings, and automatically lifts the elevator car. The purpose is to enable convenient use while minimizing the number of management personnel by preventing a fall accident while allowing lifting.

Other objects of the present invention will be easily understood through the description of the following embodiments.

In order to achieve the object as described above, according to one aspect of the present invention, a support installed on the inner surface of the elevator hoistway; A safety net that is hinged on one side to the support, and the other side is horizontally arranged to block a fall target through the elevator hoistway by being supported on the support; an installation frame provided to be located at an upper side from one side of the support; a wire having one end connected to the safety net and extending toward the installation frame; Winding machine installed in the installation frame to allow passage of the elevator car by winding the wire so that the safety net is erected to open the elevator hoistway, or to block the elevator hoistway by releasing the wire and returning the safety net to the horizontal ; Containing, the elevator hoistway automatic fall prevention device is provided.

a car detection unit for outputting a detection signal by detecting that the safety net reaches a position to be opened and a position to be blocked, respectively, when the elevator car goes up and down; and a control unit receiving the detection signal of the car sensing unit and controlling the winding machine.

The support is made of a pair so as to be respectively fixed to opposite sides in the elevator hoistway, one end of the safety net is hinged to one, and the other end of the safety net to the other is supported so that downward sag is suppressed. can be

The safety net may be formed as a pair and be horizontally disposed to be spaced apart from each other on the support.

The safety net, forming a rim, a rim frame to be supported on the support; and a net installed on the inside of the frame frame, and may be installed by the support to be located below the entrance in the elevator hoistway.

The installation frame extends upward from the support and is vertically disposed on the inner surface of the elevator hoistway, a wire guide for guiding the movement of the wire is provided, and the winding machine is installed to wind or unwind the wire. can

The car detection unit, a first transmission unit installed to transmit a signal to the upper portion of the elevator car; a second transmitter installed to transmit a signal to the lower part of the elevator car; And at a predetermined distance from the first or second transmitter, a receiver installed in the vicinity of the safety net or the support so as to receive a signal from the first or second transmitter and output a detection signal; , When the receiver receives any one of the first and second transmitter signals, it is determined that the elevator car enters, and the safety net controls the winding machine to open the elevator hoistway, and within a predetermined time range. When the receiving unit receives the other one of the first and second transmitting units, it is determined that the elevator car has passed, and the safety net can control the winding machine to block the elevator hoistway.

The safety net may be installed to be inclined so that the upper end faces the horizontal return direction when the wire is wound and erected on the winding machine.

By being installed to support the safety net erected on the installation frame, when the wire is unwound by the winding machine, it may further include a horizontal return guide for guiding the safety net to return to a horizontal posture.

According to the automatic elevator hoistway fall prevention device according to the present invention, it is possible to facilitate installation on the elevator hoistway, and it is possible to prevent the fall of workers, work materials and work tools, etc. through the hoistway and the opening, and automatically the elevator It has the effect of enabling convenient use while minimizing the number of management personnel by preventing a fall accident while allowing the car to go up and down.

1 is a perspective view of an elevator hoistway showing a state in which an automatic elevator hoistway fall prevention device according to an embodiment of the present invention is installed, before installation of an elevator car and the like immediately after the construction frame of the hoistway is completed.

Figure 2 is a perspective view of the elevator hoistway showing a state in which the automatic elevator hoistway fall prevention device according to an embodiment of the present invention is installed, after the elevator car and the like are installed.

3 is a perspective view of an automatic elevator hoistway fall prevention device according to an embodiment of the present invention, showing a state in which the hoistway is blocked.

4 is a perspective view showing an automatic elevator hoistway fall prevention device according to an embodiment of the present invention, and is a view showing a state in which the hoistway is opened.

5 is a configuration diagram illustrating an automatic elevator hoistway fall prevention device according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and it should be understood as including all changes, equivalents and substitutes included in the spirit and scope of the present invention, and may be modified in various other forms. and the scope of the present invention is not limited to the following examples.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings, and the same reference numbers are assigned to the same or corresponding components regardless of reference numerals, and redundant description thereof will be omitted.

1 is a perspective view of an elevator hoistway showing a state in which an automatic elevator hoistway fall prevention device according to an embodiment of the present invention is installed, before installation of an elevator car, etc. immediately after the construction frame of the hoistway is completed; FIG. 2 is a perspective view of the elevator hoistway showing a state in which the automatic elevator hoistway fall prevention device according to an embodiment of the present invention is installed, after the elevator car is installed, and Figure 3 is an embodiment of the present invention As a perspective view showing an automatic elevator hoistway fall prevention device according to the present invention, a view showing a state in which the hoistway is blocked, Figure 4 is a perspective view showing an elevator hoistway automatic fall prevention device according to an embodiment of the present invention 5 is a block diagram showing an automatic elevator hoistway fall prevention device according to an embodiment of the present invention.

1 to 5, the automatic elevator hoistway fall prevention device 100 according to an embodiment of the present invention is provided before the elevator car 300 is installed (see FIG. 1), the support 110, the safety net ( 120), the installation frame 130, the wire 140, and the winding machine 150 may include, and furthermore, after installation of the elevator car 300, etc. (refer to FIG. 2), the car sensing unit 160 and the control unit (170) may be further included. On the other hand, the automatic elevator hoistway fall prevention device 100 according to the present invention may be installed in plurality in the elevator hoistway 210 by being installed in each of 2-3 floors in the elevator hoistway 210 .

The support 110 is installed on the inner surface of the elevator hoistway 210, for example, is fixed to face each other on both sides in the elevator hoistway 210. It may have a "ㅁ" shape, or as another example as in this embodiment, it may be made in a pair so as to be respectively fixed opposite to each other on both sides in the elevator hoistway 210, in this case, the safety net 120 on either side or any one ) so that one end of the safety net 120 can be suppressed from sagging downward in a state where one end of the safety net 120 is hinged using a hinge or other hinge coupling member (see Fig. 3), and on the other side or the other one The other end of the safety net 120 may be supported so that downward sagging is suppressed.

The support 110 may be fixed to the inner surface of the elevator hoistway 210 using a fixing member 111 such as two or three anchor bolts, as in this embodiment.

The safety net 120 is installed to block a fall target in the elevator hoistway 210 . Here, the fall target may include, for example, not only workers, but also work materials or work tools. The safety net 120 is horizontally arranged to block a fall target through the elevator hoistway 210 by being hinged on one side to the support 110 , and the other side being supported by the support 110 .

The elevator hoistway 210 is vertically installed in the elevator installation structure 200 in which the elevator is installed, and an entrance 211 for entry and exit may be provided for each floor. The elevator car 300 installed in the elevator hoistway 210 is lifted by winding or unwinding of the hoisting rope by using the motor driving force in the machine room, and has an openable and openable door, the elevator car 300 at the end of the hoisting rope ), a counterweight is fixed to balance when ascending and descending, and a pair of guide rails for guiding the elevator car 300 when ascending and descending in the elevator hoistway 210 may be installed.

The safety net 120 is made up of a pair and can be horizontally arranged to be spaced apart from each other on the support 110, and the vertical configuration 220 for elevating and installing the elevator car 300 through this spaced passage passes through. to provide, and, thereby, it is possible to avoid such interference with the vertical configuration 220 and the like. In addition, the safety net 120 may be installed to avoid interference with the guide rail described above. On the other hand, a pair of safety net 120 may be configured to have a structure in which all are installed and supported at the same time by a single support 110, as in this embodiment, but is not limited thereto, and the support 110 is a safety net ( 120) By forming a pair to correspond to each, each of the supports 110 may be separately installed and configured to support each of the safety nets 120 . Therefore, the support 110 is for installation and support of the pair of safety nets 120, it may be made of a single, or may be made of a pair, each of which, as described above, a "C" or "ㅁ"-shaped plane It may be formed as a single structure to have a structure, or may be configured to have a pair of straight lines as in the present embodiment.

The safety net 120 may include, for example, a rim frame 121 that forms a rim and is supported by the support 110 , and a net 122 installed inside the rim frame 121 . The net 122 may have a mesh structure, and an edge may be connected or fixed to the edge frame 121 . Accordingly, the net 122 may be made of various materials such as metal or synthetic resin, and if the material is deformable to some extent, it may be configured to support the falling target while mitigating the impact when the falling target falls. In addition, the safety net 120 may be installed by the support 110 to be located at the lower side of the doorway 211 in the elevator hoistway 210, and thereby, the falling distance of the falling target falling through the doorway 211 It can be reduced to minimize the impact on the falling target.

When the wire 140 is wound and erected on the winding machine 150 , the safety net 120 may be installed with an upper end inclined toward a horizontal return direction. To this end, for example, the upper end of the installation frame 130 may be configured to support the safety net 120 at an angle so that the upper end of the safety net 120 faces a horizontal return direction. Therefore, due to the inclination of the safety net 120, when the winding machine 150 unwinds the wire 140, the safety net 120 can be easily returned to the horizontal due to its inclination.

The installation frame 130 is provided to be located at the upper side from one side of the support 110 , and for this purpose, it is manufactured to be integral with the support 110 as in this embodiment, or has a structure assembled or coupled to the support 110 . It may be manufactured or may be manufactured to be installed on the upper side of the support 110 as a structure independent of the support 110 . Therefore, the installation frame 130 is located on the upper side from one side of the support 110, when pulling the wire 140 extending to the own side can act so that the safety net 120 is erected.

The installation frame 130 extends upward from the support 110 and may be vertically disposed on the inner surface of the elevator hoistway 210, and wire guides 131 and 132 for guiding the movement of the wire 140 may be provided. There, the winding machine 150 may be installed to wind or unwind the wire 140 . The wire guides 131 and 132 are members for guiding the wire 140 to easily move toward the winding machine 150, for example, various wire guide members including guide rollers and guide rings may be used.

The wire 140 has one end connected to the safety net 120 to extend toward the installation frame 130, and is directly connected to the opposite end of the hinge coupling part in the safety net 120, or a separate connecting member such as a ring or bracket is used. can be connected to A plurality of wires 140 may be installed for each safety net 120 as in this embodiment, for example, a pair, but the present invention is not limited thereto, and may be installed as a single or a plurality of other than two of course. In this case, the number of winding machines 150 may correspond to the number of wires 140 .

The winding machine 150 winds the wire 140 so that the safety net 120 is erected to open the elevator hoistway 210 to allow the passage of the elevator car 300, or to unwind the wire 140 so that the safety net 120 is installed. It may be installed in the installation frame 130 to block the elevator hoistway 210 by returning to the horizontal.

Winding machine 150, for example, as in this embodiment, a winding motor 151 for providing a driving force required for winding, a reducer 152 for reducing the rotational force of the winding motor 151, and the reduction gear 152 is connected to the reducer It may include a reel 153 such that the wire 140 is wound by the rotational force of 152 . In addition, the winding motor 151 or the speed reducer 152 may be fixed to various positions of the installation frame 130 by using a fixing member such as direct welding, bolting, or a separate bracket.

As shown in FIG. 1 , the winding machine 150 may be configured to operate by an operator's switch operation instead of the control unit 170 , which will be described later, before installation of the elevator car 300 . Here, the switch is installed at a position that can be easily operated by an operator, and there is no need to be specified in any one place. In addition, as shown in FIG. 2 , the winding machine 150 is controlled by the control unit 170 that receives the detection signal of the car detection unit 160 to be described later and performs a control operation after the elevator car 300 is installed. can be

In the winding machine 150, the winding motor 151 is made of a step motor or a servo motor, etc. for controlling the amount of rotation to accurately perform posture conversion between a state in which the safety net 120 is erected and a state in which it is returned to the horizontal, or an encoder, etc. can be used to control the amount of rotation. On the other hand, the winding motor 151 may be controlled to accurately change the posture of the safety net 120 through its rotational amount control as described above, but is not limited thereto, and the safety net 120 returns to the erected state and horizontally. It may be configured to accurately perform posture conversion of the safety net 120 by manipulation or control signal using a detection sensor that detects a state by transmission/reception, touch, or pressing, respectively.

The car detection unit 160 outputs a detection signal by sensing that, when the elevator car 300 goes up and down, the safety net 120 arrives at a position where the elevator hoistway 210 is to be opened and a position to be blocked, respectively. That is, the car detection unit 160 not only detects that the elevator car 300 enters to pass the area blocked by the safety net 120 in the elevator hoistway 210 , but also detects that the elevator car 300 is opened by the safety net 120 . By detecting passing through the area, it can be blocked by the safety net 120 again.

To this end, the car sensing unit 160 may be configured to enable the detection of the elevator car 300 by various types of contact or non-contact methods. Considering the convenience of installation and reliability of operation, the elevator car 300 . A first transmitter 161 installed to transmit a signal to the upper portion of the, a second transmitter 162 installed to transmit a signal to a lower portion of the elevator car 300, and a first or

second transmitter

161, 162 In the distance, the safety net 120 or the support 110 or the receiving unit 163 installed in the vicinity thereof to receive the signal of the first or

second transmitter

161, 162 and output a detection signal may be included.

In the car detection unit 160, the signal is not only an optical signal, but also a variety of radio signals that enable transmission and reception, including RF signals, may be used. In addition, the predetermined distance has a receiving range that allows the receiving unit 163 to selectively receive any one of the first and second transmitting

units

161 and 162 signals, but the safety net 120 in the elevator hoistway 210 is erected or In consideration of securing the space necessary for horizontal return, it is possible to have a reception range to detect the entrance of the elevator car 300 toward the safety net 120 that has blocked the elevator hoistway 210, which is the output of the signal. Of course, it can be obtained experimentally or through adjustment in actual application in consideration of strength, reception sensitivity, speed of the elevator car 300, the standard of the safety net 120, the required time for posture change of the safety net 120, etc. .

The control unit 170 receives the detection signal of the car sensing unit 160 and controls the winding machine 150 to allow the elevator car 300 to go up and down with respect to the elevator hoistway 210 , while the elevator hoistway 210 . It is controlled so that it is possible to return or maintain the blocked state.

The control unit 170 is, for example, as in this embodiment, when the car sensing unit 160 includes the first and second transmitting

units

161 and 162 and the receiving unit 163, any of the first and second transmitting

units

161 and 162 When the receiving unit 163 receives one signal, it is determined that the elevator car 300 enters, and the safety net 120 can control the winding machine 150 to open the elevator hoistway 300, and for a predetermined time. When the receiving unit 163 receives the other signal among the first and second transmitting

units

161 and 162 within the range, it is determined that the elevator car 300 has passed, and the safety net 120 blocks the elevator hoistway 210. It is possible to control the winding machine 150 to make it. The time range determined here may be the time it takes for the receiving unit 163 to receive the signal from the second transmitting unit 162 after receiving the signal from the first transmitting unit 161 when the elevator car 300 is ascending, and conversely, the elevator car When 300 is descending, it may be the time it takes for the receiving unit 163 to receive the signal of the first transmitting unit 161 from after receiving the signal of the second transmitting unit 162 to receive the signal of the first transmitting unit 161. You can also set

The automatic elevator hoistway fall prevention device 100 according to an embodiment of the present invention is installed to support the safety net 120 erected on the installation frame 130 , so that the wire 140 is unwound by the winding machine 150 . In this case, a horizontal return guide 180 for guiding the safety net 120 to return to a horizontal posture may be provided. The horizontal return guide 180 is a member that provides an elastic force in the return direction so that the safety net 120 can easily return horizontally in a standing state, and may be, for example, a compression coil spring, and is not limited thereto. It can also be done in the absence of

The operation of the automatic elevator hoistway fall prevention device according to the present invention will be described.

When the elevator car 300 goes up and down along the inside of the elevator hoistway 210 , the safety net 120 located on the lift path is a detection signal for detecting the entry of the elevator car 300 by the car detection unit 160 . Accordingly, the winding machine 150 operates under the control of the control unit 170 to wind and pull the wire 140, so that the safety net 120 is rotated around the hinge-coupled portion to stand up, and thereby the elevator car ( The elevator hoistway 210 may be in an open state to allow the 300 to pass therethrough.

On the other hand, when the elevator car 300 passes, the winding machine 150 operates under the control of the control unit 170 as the passage of the elevator car 300 is sensed by the car sensing unit 160 to operate the wire 140 . By releasing the , the safety net 120 rotates downward and returns on the support 110 , so that it is blocked by the safety net 120 in the elevator hoistway 210 , and thus the worker through the elevator hoistway 210 . , it is possible to prevent the fall of work materials and work tools.

According to the automatic elevator hoistway fall prevention device according to the present invention as described above, it is possible to easily install the elevator hoistway, and it is possible to prevent the fall of the worker, the work material and the work tool.

In addition, according to the present invention, it enables convenient use while minimizing the number of management personnel by preventing a fall accident while automatically allowing the elevator car to go up and down.

As described above, the present invention has been described with reference to the accompanying drawings, but it goes without saying that various modifications and variations can be made within the scope without departing from the technical spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims described below as well as those claims and equivalents.

The present invention is easy to install on the elevator hoistway, prevents the fall of workers, work materials, and work tools through the hoistway and openings, and minimizes management personnel by automatically allowing the elevator car to go up and down while preventing a fall accident It is to provide an automatic elevator hoistway fall prevention device that enables convenient use.

Claims

Support installed on the inner surface of the elevator hoistway;

A safety net that is hinged on one side to the support, and the other side is horizontally arranged to block a fall target through the elevator hoistway by being supported on the support;

an installation frame provided to be located at an upper side from one side of the support;

a wire having one end connected to the safety net and extending toward the installation frame; and

Winding machine installed in the installation frame to allow passage of the elevator car by winding the wire so that the safety net is erected to open the elevator hoistway, or to block the elevator hoistway by releasing the wire and returning the safety net to the horizontal including;

The support is

It is made in a pair so as to be fixed to opposite sides on both sides of the elevator hoistway, and one end of the safety net is hinged to any one support so that one end of the safety net can be suppressed from sagging downward. , is provided so that the installation frame is integrally formed upward, and the other end of the safety net is supported on the other support so that sagging downward is suppressed,

The safety net is

Consisting of a pair and arranged horizontally so as to be spaced apart from each other on the support,

By being installed to support the safety net erected on the installation frame, when the wire is unwound by the winding machine, the safety net further includes a horizontal return guide that provides an elastic force to return to a horizontal position, elevator hoistway fall automatic prevention device.
The method according to claim 1,

a car detection unit for outputting a detection signal by detecting that the safety net reaches a position to be opened and a position to be blocked, respectively, when the elevator car goes up and down; and

a control unit receiving the sensing signal of the car sensing unit and controlling the winding machine;

Including, automatic elevator hoistway fall prevention device
The method according to claim 1,

The safety net is

a rim frame to form a rim and to be supported on the support; and

Including; net installed on the inside of the frame frame,

The automatic elevator hoistway fall prevention device installed by the support to be located at the lower side of the entrance in the elevator hoistway.
4. The method according to any one of claims 1, 2 and 3,

The installation frame is

It extends upward from the support and is vertically disposed on the inner surface of the elevator hoistway, a wire guide for guiding the movement of the wire is provided, and the winding machine is installed to wind or unwind the wire, the elevator hoistway fall automatic prevention device.
3. The method according to claim 2,

The car sensing unit,

a first transmitter installed to transmit a signal to the upper part of the elevator car;

a second transmitter installed to transmit a signal to the lower part of the elevator car; and

At a predetermined distance from the first or second transmitter, a receiver installed in the vicinity of the safety net or the support to receive a signal from the first or second transmitter and output a detection signal; includes;

The control unit is

When the receiver receives any one of the first and second transmitter signals, it is determined that the elevator car enters, and the safety net controls the winding machine to open the elevator hoistway, and within a predetermined time range, the winding machine is controlled. When the receiving unit receives the other one of the first and second transmitting units, it is determined that the elevator car has passed, and the safety net controls the winding machine to block the elevator hoistway.
4. The method according to any one of claims 1, 2 and 3,

The safety net is

When the wire is wound and erected in the winding machine, the upper end is installed to be inclined toward the horizontal return direction, the elevator hoistway automatic fall prevention device.