Lifting device
By installing anti-sway components on both sides of the lifting equipment and cooperating with the ladder for support, the problems of equipment swaying and jamming are solved, improving stability and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-03-10
AI Technical Summary
Existing lifting equipment is prone to swaying during use due to personnel movement, which may interfere with or cause jamming with the building, affecting stability and safety.
Anti-sway components, including wheel components and support components, are symmetrically installed on both sides of the elevator body. These components provide additional support and improve stability by working in conjunction with the ladder.
By adding anti-sway components, the stability and safety of the lifting equipment during operation are enhanced, avoiding swaying and jamming problems.
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Figure CN223983309U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to climbing equipment technical field especially, relates to a lifting device. BACKGROUND
[0002] In order to promote the work efficiency of aerial work, reduce the risk existing in the process of aerial work, the lifting device applied in the field such as wind power tower, high altitude building, dam, bridge, hydropower and photovoltaic roof has various forms.
[0003] At present, the lifting device with simple structure, such as climber and tower climbing machine, adopts single column guide rail structure to guide operation, the guide rail is installed in the middle position of the climbing ladder, and the lifting device can run up and down along the guide rail through the cooperation of the guide wheel and the driving wheel in the back.
[0004] In the operation process, if the user shakes or twists the body, the lifting device will shake, so that the lifting device interferes with the surrounding building, and even the lifting device is stuck on the guide rail and cannot run normally. INVENTION CONTENTS
[0005] The utility model provides a lifting device to solve the above technical defects in the prior art, the anti-shaking assembly symmetrically arranged on both sides of the lifting body is matched with the climbing ladder to support, the stability of the lifting body in the operation process can be improved, and the lifting body is prevented from shaking.
[0006] The utility model provides a lifting device, including lifting body and anti-shaking assembly, the lifting body is suitable for lifting motion along the guide piece installed on the climbing ladder, the anti-shaking assembly is located at the opposite sides of the lifting body, and at least one anti-shaking assembly is arranged on each side, the anti-shaking assembly keeps contact with the climbing ladder during the lifting motion of the lifting body.
[0007] According to the lifting device provided by the utility model, the anti-shaking assembly includes wheel part and support, one end of the support is fixedly connected with the lifting body, the other end of the support is suspended, and the wheel part is arranged at the suspended end of the support.
[0008] According to the lifting device provided by the utility model, the wheel part includes a roller, a mounting shaft and a fastening part, the roller is sleeved on the outer side of the mounting shaft, and the mounting shaft is fixed to the support through the fastening part.
[0009] According to the lifting device provided by the utility model, the wheel part further includes a bearing, and the bearing is embedded between the roller and the mounting shaft.
[0010] According to the lifting device, the fastening component comprises a fastening nut and a corresponding gasket, the fastening nut is connected with at least one end of the mounting shaft, and the gasket is arranged between the supporting piece and the fastening nut or the roller.
[0011] According to the lifting device, the lifting body comprises a lifting vehicle body, a handrail assembly and a pedal assembly.
[0012] The lifting vehicle body is adapted to perform lifting movement along a guide piece mounted on a ladder, the handrail assembly is connected to the top of the lifting vehicle body, the pedal assembly is connected to the bottom of the lifting vehicle body, and the anti-shaking assembly is symmetrically arranged on both sides of the lifting vehicle body.
[0013] According to the lifting device, the lifting body comprises a lifting vehicle body, a handrail assembly, a pedal assembly and a guardrail assembly.
[0014] The lifting vehicle body is adapted to perform lifting movement along a guide piece mounted on a ladder, the handrail assembly is connected to the top of the lifting vehicle body, the pedal assembly is connected to the bottom of the lifting vehicle body, and the anti-shaking assembly is symmetrically arranged on both sides of the lifting vehicle body.
[0015] According to the lifting device, the guardrail assembly comprises an enclosure structure and a frame structure, the enclosure structure is arranged at the periphery of the pedal assembly and connected with the lifting vehicle body, and the frame structure is arranged above the enclosure structure and connected with the handrail assembly.
[0016] In the case that the anti-shaking assembly is arranged on each side, the anti-shaking assembly is arranged on both sides of the enclosure structure.
[0017] According to the lifting device, the frame structure comprises a frame body and a door body, one side of the frame body is provided with a notch, the door body is arranged at the position of the notch, and the door body can be opened or closed relative to the frame body.
[0018] According to the lifting device, the door body comprises a first door rail and a second door rail, the first door rail and the second door rail are both hinged to the frame body, and the first door rail and the second door rail are hinged to each other, and the first door rail or the second door rail is provided with a door handle.
[0019] When the door body is opened, the first door rail and the second door rail are accommodated in the frame body.
[0020] When the door body is closed, the first door post and the second door post are unfolded, and one of the first door post and the second door post is locked to the frame body.
[0021] The lifting equipment provided by the utility model, through the anti-shaking assembly symmetrically arranged on both sides of the lifting body, at least one anti-shaking assembly is arranged on each side, the anti-shaking assembly keeps in contact with the ladder during the lifting movement of the lifting body.
[0022] The lifting body is supported and limited by the guide wheel and the guide piece, the guide wheel is located at the middle position of the lifting body, on the basis, the anti-shaking assembly is symmetrically arranged on both sides of the lifting body, and the anti-shaking assembly is supported in cooperation with the ladder, so that the stability of the lifting body is further improved, and the safety of the lifting equipment is improved. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0024] Figure 1 It is one of the structure schematic diagrams of the lifting equipment provided by the utility model embodiment.
[0025] Figure 2 It is Figure 1 The enlarged view of A part in the figure.
[0026] Figure 3 It is the structure schematic diagram of the anti-shaking assembly in the lifting equipment provided by the utility model.
[0027] Figure 4 It is the second structure schematic diagram of the lifting equipment provided by the utility model embodiment.
[0028] Figure 5 It is the plan view of the lifting equipment provided by the utility model embodiment.
[0029] Figure 6 It is the third structure schematic diagram of the lifting equipment provided by the utility model embodiment.
[0030] Figure 7 It is Figure 6 The enlarged view of B part in the figure.
[0031] REFERENCE SIGNS:
[0032] 10, elevator body; 11, lift car body; 111, drive gear; 112, guide wheel; 12, handrail assembly; 13, step assembly; 14, guardrail assembly; 141, enclosure structure; 142, frame structure; 1421, frame body; 1422, door body; 1422-1, first door post; 1422-2, second door post; 1422-3, door handle;
[0033] 20, anti-shaking assembly; 21, wheel component; 211, roller; 212, mounting shaft; 213, fastening component; 2131, fastening nut; 2132, gasket; 22, support component;
[0034] 30, crawling ladder; 40, guide component; 50, support arm. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
[0036] In the description of the embodiments of the present application, it should be noted that unless explicitly defined and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0037] In the embodiments of the present application, unless explicitly defined and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0038] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.
[0039] Figure 1 is a structural schematic view of a lifting device provided by the embodiments of the present application. Figure 2 is Figure 1 is an enlarged view of A part in
[0040] Referring to Figure 1 and Figure 2 , the embodiments of the present application provide a lifting device, which can be a climbing ladder 30 or a tower climbing machine used in the fields of wind power tower, high-rise building, dam, bridge, hydropower and photovoltaic roof, etc.
[0041] The lifting device comprises a lifting body 10, which is adapted to perform lifting movement along a guide 40 mounted on the climbing ladder 30, that is, the guide 40 is mounted in the middle of the climbing ladder 30 by bolts, the climbing ladder 30 is mounted on the surface of the building or the surface of the tower by a support arm 50, the lifting body 10 cooperates with the guide 40 through a driving motor, and the driving motor provides power to make the lifting body 10 move along the guide 40.
[0042] The lifting body 10 is symmetrically provided with an anti-shaking assembly 20 on both sides, and at least one anti-shaking assembly 20 is provided on each side. During the lifting movement of the lifting body 10, the anti-shaking assembly 20 keeps in contact with the climbing ladder 30. Two supporting points are added symmetrically on both sides of the lifting body 10, which improves the stability of the lifting body 10 during operation and avoids shaking of the lifting body 10.
[0043] Since the lifting body 10 cooperates with the guide 40 through the guide wheel 112 provided, when the guide wheel 112 and the anti-shaking assembly 20 are located on the same straight line, the guide wheel 112 and the anti-shaking assembly 20 provide linear support for the lifting body 10, and when the guide wheel 112 and the anti-shaking assembly 20 form a triangular structure, the guide wheel 112 and the anti-shaking assembly 20 provide planar support for the lifting body 10, which can effectively improve the stability of the lifting body 10.
[0044] It is understood that the lifting device provided in this embodiment of the present invention, by symmetrically providing anti-sway components 20 on both sides of the lifting body 10, with at least one anti-sway component 20 on each side; during the lifting movement of the lifting body 10, the anti-sway components 20 remain in contact with the ladder 30. This arrangement, with the anti-sway components 20 symmetrically arranged on both sides of the lifting body 10 cooperating with the ladder 30 for support, can improve the stability of the lifting body 10 during operation and prevent the lifting body 10 from swaying.
[0045] Since the lifting body 10 is supported and limited by the guide wheel 112 and the guide component 40, and the guide wheel 112 is located near the middle of the lifting body 10, the stability of the lifting body 10 can be further improved by symmetrically setting anti-sway components 20 on both sides of the lifting body 10 and making the anti-sway components 20 cooperate with the ladder 30 for support, thereby improving the safety of the lifting equipment.
[0046] In other words, the lifting body 10 is supported not only by the guide wheel 112 and the guide component 40, but also by the anti-sway components 20 symmetrically arranged on both sides of the lifting body 10 and the ladder 30. The guide wheel 112 and the anti-sway components 20 can provide linear support or planar support for the lifting body 10, which can improve the stability of the lifting body 10 during operation, prevent the lifting body 10 from shaking, and thus improve the safety of the lifting equipment.
[0047] Continue reading Figure 2 In some embodiments of this utility model, the anti-sway component 20 includes a wheel component 21 and a support component 22. One end of the support component 22 is fixedly connected to the elevator body 10, and the other end of the support component 22 is suspended in the air. The wheel component 21 is located at the suspended end of the support component 22.
[0048] This means that there is a certain distance between the elevator body 10 and the ladder 30, and the support member 22 can not only install the wheel component 21, but also make up for the distance between the elevator body 10 and the ladder 30, so that the wheel component 21 and the ladder 30 can form a reliable contact.
[0049] The structure of the support member 22 can be adaptively adjusted according to the distance between the elevator body 10 and the ladder 30.
[0050] Figure 3 This is a structural schematic diagram of the anti-sway component in the lifting device provided by this utility model.
[0051] See Figure 3 In some embodiments of this utility model, the wheel component 21 includes a roller 211, a mounting shaft 212 and a fastening component 213. The roller 211 is sleeved on the outside of the mounting shaft 212, and the fastening component 213 fixes the mounting shaft 212 to the support member 22.
[0052] When the elevator body 10 moves up and down along the guide member 40, the rollers 211 roll along the vertical beam of the ladder 30, which is equivalent to adding a fulcrum to the elevator body 10 during operation, which can prevent the elevator body 10 from shaking. The number of fulcrums is related to the number of rollers 211.
[0053] In some embodiments of this utility model, in order to reduce the friction between the roller 211 and the mounting shaft 212, the wheel component 21 further includes a bearing, which is disposed between the roller 211 and the mounting shaft 212, that is, the bearing is embedded between the roller 211 and the mounting shaft 212. Specifically, the bearing is sleeved on the outer surface of the mounting shaft 212, and the roller 211 is sleeved on the outer surface of the bearing. The bearing can be an oil-free bushing.
[0054] In some embodiments of this utility model, the fastening component 213 includes a fastening nut 2131 and a corresponding washer 2132. The fastening nut 2131 is connected to at least one end of the mounting shaft 212. The washer 2132 is disposed between the support member 22 and the fastening nut 2131 or the roller 211.
[0055] For example, when the mounting shaft 212 is a light shaft with a limiting end at one end, the roller 211 is sleeved on the light shaft part of the mounting shaft 212, and the other end of the mounting shaft 212 is threaded. The fastening nut 2131 cooperates with the thread to fix the mounting shaft 212 on the support member 22. In order to improve the fastening effect and prevent the roller 211 from rubbing against the limiting end and the support member 22, a washer 2132 is provided between the support member 22 and the fastening nut 2131 or the roller 211.
[0056] For example, when the mounting shaft 212 is a pin, the roller 211 is sleeved on the mounting shaft 212. Both ends of the mounting shaft 212 are threaded, and the fastening nut 2131 is threaded to both ends of the mounting shaft 212. Washers 2132 are provided between the fastening nut 2131 and the support member 22, between the fastening nut 2131 and the roller 211, and between the roller 211 and the support member 22.
[0057] Figure 4 This is the second structural schematic diagram of the lifting device provided in this embodiment of the utility model. Figure 5 This is a top view of the lifting device provided in an embodiment of this utility model.
[0058] See Figure 4 and Figure 5In some embodiments of this utility model, the lifting body 10 includes a lifting vehicle 11, a handrail assembly 12, and a pedal assembly 13; the lifting vehicle 11 is adapted to move up and down along the guide member 40 installed on the ladder 30, the handrail assembly 12 is connected to the top of the lifting vehicle 11, and the pedal assembly 13 is connected to the bottom of the lifting vehicle 11; the anti-sway assembly 20 is symmetrically arranged on both sides of the lifting vehicle 11.
[0059] In this embodiment of the invention, the lifting body 10 can be a common non-climbing crane or tower crane in the art. Based on the original structure of the lifting body 10, only anti-sway wheel components are added. These anti-sway wheel components are symmetrically arranged on both sides of the lifting body 11, resulting in a simple structural improvement while achieving an anti-sway effect.
[0060] The lifting vehicle body 11 serves as the main load-bearing and control unit of the lifting platform body 10. The lifting vehicle body 11 includes a closed shell, as well as control components and drive components installed inside the shell. The shell restricts the installation space for installing the drive components and control components. The control components and drive components are installed inside the shell, which can play a protective role.
[0061] The drive assembly may include a power source and a drive gear 111. The power source is located inside the lifting body 11, and the drive gear 111 is connected to the output end of the power source. The drive gear 111 extends to the outside of the housing and meshes with the rack of the guide member 40 to form a power output structure. The power source may be a geared motor.
[0062] The lifting vehicle body 11 also has guide wheels 112 on its shell. The guide wheels 112 are arranged in pairs, and there is at least one set of guide wheels 112. When the lifting body 10 moves up and down along the guide member 40, the guide wheels 112 provide guidance and support for the lifting body 10. When there are multiple sets of guide wheels 112, the multiple sets of guide wheels 112 can be arranged along the extension direction of the guide member 40.
[0063] The pedal assembly 13 includes a pedal component, a pedal support, and a lower contour component. The pedal support allows the pedal assembly 13 to be mounted on the lifting vehicle body 11; the pedal component is located on the pedal support, and the lower contour component is connected to the lower part of the pedal component, with a limiting structure on the lower contour component for limiting its position.
[0064] The handrail assembly 12 can be integrated with a control switch, which allows the operator to start the lift by pressing with both hands and stop it by releasing either hand, thus preventing the lift from starting with one hand. This restrains the operator's hands, ensuring that both hands remain on the handrail assembly 12 during the operation of the lifting equipment, preventing accidents caused by the operator holding the lift with one hand.
[0065] In addition, a fall protection component can be installed on the lifting vehicle body 11. The fall protection component works with the fall protection hole on the guide 40 to limit the fall.
[0066] Continue reading Figure 4 and Figure 5 In some embodiments of this utility model, the lifting body 10 includes a lifting vehicle body 11, a handrail assembly 12, a pedal assembly 13, and a guardrail assembly 14.
[0067] The lifting vehicle body 11 is adapted to move up and down along the guide member 40 installed on the ladder 30. The handrail assembly 12 is connected to the top of the lifting vehicle body 11, the pedal assembly 13 is connected to the bottom of the lifting vehicle body 11, the guardrail assembly 14 is disposed around the pedal assembly 13, the guardrail assembly 14 extends along the height direction of the lifting vehicle body 11, and the guardrail assembly 14 is connected to at least one of the lifting vehicle body 11 and the handrail assembly 12 respectively. The anti-sway assembly 20 is symmetrically disposed on both sides of the guardrail assembly 14.
[0068] In contrast, when the guardrail assembly 14 is not provided in the above embodiment, an anti-sway assembly 20 can be provided on the lifting vehicle body 11. In this embodiment, in order to improve the safety of the lifting equipment, a guardrail assembly 14 is added to the lifting body 10. The guardrail assembly 14 is located on the periphery of the pedal assembly 13 and extends along the height direction of the lifting vehicle body 11.
[0069] Furthermore, to improve the stability of the lifting equipment, anti-sway components 20 are symmetrically arranged on opposite sides of the guardrail assembly 14. The anti-sway components 20 can be installed near the lower end of the guardrail assembly 14. When the lifting equipment is in operation, the guide wheels 112 and anti-detachment wheels on the guardrail assembly 14 run along the guide member 40 (i.e., rack and pinion guide rail), and the anti-sway components 20 roll along the vertical beam of the ladder 30, adding support points on the left and right sides of the lifting body 10 to improve the stability of the lifting body 10 during operation.
[0070] Figure 6 This is the third structural schematic diagram of the lifting device provided in this embodiment of the utility model. Figure 7 yes Figure 6 Enlarged view of section B in the middle.
[0071] See Figure 6 and Figure 7 In some embodiments of this utility model, the guardrail assembly 14 includes a barrier structure 141 and a frame structure 142. The barrier structure 141 is disposed around the pedal assembly 13 and connected to the lifting vehicle body 11; the frame structure 142 is disposed above the barrier structure 141 and connected to the handrail assembly 12. If one anti-sway component 20 is provided on each side, the anti-sway components 20 are disposed on both sides of the barrier structure 141.
[0072] The enclosure structure 141 is essentially three baffles surrounding the pedal assembly 13. The three baffles are connected end to end, which can protect the pedal assembly 13 and increase the enclosure height of the guardrail assembly 14 to prevent small items from falling from here.
[0073] Continue reading Figure 7 In some embodiments of this utility model, the frame structure 142 includes a frame body 1421 and a door 1422. A notch is provided on one side of the frame body 1421, and the door 1422 is located at the notch. The door 1422 can be opened or closed relative to the frame body 1421.
[0074] The door body 1422 includes a first door frame 1422-1 and a second door frame 1422-2. Both the first door frame 1422-1 and the second door frame 1422-2 are hinged to the frame body 1421, and the first door frame 1422-1 and the second door frame 1422-2 are hinged to each other. The first door frame 1422-1 or the second door frame 1422-2 is provided with a door handle 1422-3.
[0075] When the door 1422 is in the open state, the first door bar 1422-1 and the second door bar 1422-2 are stored in the frame body 1421, facilitating personnel entry and exit, as well as the handling of materials; when the door 1422 is in the closed state, the first door bar 1422-1 and the second door bar 1422-2 are unfolded, and one of the first door bar 1422-1 and the second door bar 1422-2 is locked to the frame body 1421.
[0076] In addition, the door body 1422 can also adopt a panel structure. The door body 1422 is connected to the frame through hinges and other structures. The specific design can be adapted according to the actual usage.
[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. An elevating apparatus characterized by comprising: The application relates to a ladder stabilizer. The ladder stabilizer comprises a ladder body and a stabilizer assembly. The ladder body is adapted to move up and down along a guide installed on a ladder.
2. The lifting device of claim 1, wherein, The stabilizer assembly is arranged on opposite sides of the ladder body.
3. The lifting device of claim 2, wherein, The stabilizer assembly comprises a wheel component and a support component.
4. The lift device of claim 3, wherein, One end of the support component is fixedly connected to the ladder body.
5. The lift device of claim 3, wherein, The other end of the support component is suspended.
6. The lifting device according to any one of claims 1 to 5, characterized in that The wheel component is arranged on the suspended end of the support component. The wheel component comprises a roller, a mounting shaft and a fastening component.
7. The lifting device according to any one of claims 1 to 5, characterized in that The roller is sleeved on the outside of the mounting shaft. The mounting shaft is fixed to the support component through the fastening component.
8. The lifting device of claim 7, wherein, The fastening component comprises a fastening nut and a corresponding gasket. The fastening nut is connected to at least one end of the mounting shaft.
9. The lift device of claim 8, wherein, The gasket is arranged between the support component and the fastening nut or the roller.
10. The lift device of claim 9, wherein, The ladder body comprises a ladder car body, a handrail assembly and a pedal assembly. The ladder car body is adapted to move up and down along a guide installed on a ladder. The handrail assembly is connected to the top of the ladder car body. The pedal assembly is connected to the bottom of the ladder car body. The stabilizer assembly is symmetrically arranged on both sides of the ladder car body. The ladder body comprises a ladder car body, a handrail assembly, a pedal assembly and a guardrail assembly. The ladder car body is adapted to move up and down along a guide installed on a ladder. The handrail assembly is connected to the top of the ladder car body. The pedal assembly is connected to the bottom of the ladder car body. The guardrail assembly is arranged on the periphery of the pedal assembly. The guardrail assembly extends along the height direction of the ladder car body. The guardrail assembly is connected to at least one of the ladder car body and the handrail assembly. The stabilizer assembly is symmetrically arranged on both sides of the guardrail assembly. The guardrail assembly comprises an enclosure structure and a frame structure. The enclosure structure is arranged on the periphery of the pedal assembly and is connected to the ladder car body. The frame structure is arranged above the enclosure structure and is connected to the handrail assembly. When one stabilizer assembly is arranged on each side, the stabilizer assembly is arranged on both sides of the enclosure structure. The frame structure comprises a frame body and a door body. One side of the frame body is provided with a gap. The door body is arranged at the position of the gap. The door body can be opened or closed relative to the frame body. The door body comprises a first door post and a second door post. Both the first door post and the second door post are hinged to the frame body. The first door post and the second door post are hinged to each other. The first door post or the second door post is provided with a door handle. When the door body is opened, the first door post and the second door post are accommodated in the frame body. When the door body is closed, the first door post and the second door post are unfolded. One of the first door post and the second door post is locked to the frame body.