Movable indoor pipeline elevator
By designing a movable indoor pipeline elevator including lifting components, lifting components and adjustment components, the problems of unstable pipeline lifting and limited lifting height in the prior art are solved, efficient and safe installation of pipelines are achieved, and construction efficiency is improved.
Patent Information
- Application Number
- CN202420510816.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-16
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-03-16
AI Technical Summary
The pipeline elevators in the prior art are not easy to fix the pipeline when the pipeline is lifted, which poses a risk of falling, and the lifting height is limited, which affects construction efficiency.
A movable indoor duct hoist is designed, including a base, lift assembly, lift assembly and adjustment assembly. The lifting assembly realizes the rise or fall of the moving plate through the lead screw nut mechanism, and the lifting assembly performs secondary lifting through the scissor mechanism. The adjustment assembly includes a rotary plate and a clamping plate, and clamping and adjusting the pipe through the clamping cylinder operation.
The device can adjust the lifting height of the pipe according to the indoor height, reduce the number of times the base is pushed to adjust the pipe alignment, improve construction efficiency, and reduce the risk of pipe falling through the clamping function of the clamping plate.
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Figure CN222574203U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of elevators, in particular to a movable indoor pipeline elevator. Background Art
[0002] After the overall construction of the entire commercial building is completed, it is necessary to install pipes of various types and sizes, such as ventilation ducts, air-conditioning ducts, etc. The pipes need to be transported indoors by a trolley first, and then lifted from the ground to a high place for installation by a hoist. The pipes are mostly connected by multiple sections. The pipe hoists in the prior art are relatively simple, and it is not easy to fix the pipes when lifting them, which makes the pipes have the risk of falling. When the pipes to be installed need to be installed, there may be a possibility of pushing the pipe hoist multiple times to adjust and align with the installed pipes, which affects the construction efficiency. In addition, the prior art uses a pulley group to cooperate to achieve the lifting of the pipes to be installed, and the lifting depends on the height of the hoist bracket, and the lifting height is limited.
[0003] Therefore, it is urgent to provide a kind of movable indoor pipeline lifting machine to solve the above problems. Utility Model Content
[0004] In response to the above problems, the utility model provides a movable indoor pipe hoist, which can effectively adjust the height of the pipe to be installed in accordance with the indoor height, and reduce the number of times the base is pushed to adjust the pipe so that the pipe is aligned, thereby facilitating the installation of the pipe to be installed and effectively improving construction efficiency.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] A movable indoor pipe hoist comprises a base, a lifting assembly, a lifting assembly and an adjusting assembly. The base moves along the ground via universal wheels, a lifting assembly is arranged on the base, the lifting assembly comprises a moving plate, the lifting assembly realizes the rising or falling of the moving plate via a screw nut mechanism, a lifting assembly is arranged on the moving plate, an adjusting assembly is installed on the lifting assembly, the adjusting assembly comprises a rotating plate, the rotating plate is rotatably connected to the lifting assembly, clamping plates are symmetrically arranged on both sides of the rotating plate, a pipe is arranged between the two clamping plates, and the clamping plates realize the clamping or loosening of the pipe through the action of a clamping cylinder.
[0007] Preferably, the lifting assembly also includes a fixed frame and a screw rod, the fixed frame is fixedly arranged at one end of the base, and a guide groove is arranged on one side of the fixed frame; the screw rod is rotatably arranged in the middle of the fixed frame, the middle of the movable plate is threadedly connected to the screw rod, and the side of the movable plate is slidably connected to the guide groove.
[0008] Preferably, a guide block is provided at one end of the movable plate close to the fixed frame, and the movable plate is slidably connected to the guide groove on the fixed frame through the guide block. A nut block is penetrated through the middle of another end of the movable plate close to the fixed frame, and the screw rod passes through the nut block and is connected to the nut block by a thread.
[0009] Preferably, the bottom of the rotating plate is rotatably connected to the lifting assembly, and mounting grooves are symmetrically arranged on both sides of the rotating plate. A clamping cylinder is horizontally arranged in the mounting groove, and the telescopic end of the clamping cylinder is fixedly connected to the clamping plate.
[0010] Preferably, the fixed end of the clamping cylinder is fixedly connected to the mounting groove, the lower part of the clamping plate is inserted into the mounting groove, and the mounting groove is slidably connected, and the opposite sides of the two clamping plates abut against or separate from the side wall of the pipeline.
[0011] Preferably, the adjustment assembly further includes a fixed plate and an arc-shaped plate; the fixed plate is fixedly arranged on the upper lifting assembly, and the upper part of the fixed plate close to the rotating plate is fixedly connected to the arc-shaped plate, and an arc-shaped movable groove is arranged through the arc-shaped plate.
[0012] Preferably, the adjustment assembly also includes a connecting rod, and a threaded groove is arranged on the side of the rotating plate away from the lifting assembly. The lower part of the connecting rod passes through the movable groove and extends into the threaded groove and is fixedly connected to the threaded groove. An external thread is arranged on the upper part of the connecting rod, and a knob is sleeved on the connecting rod, and an internal thread is arranged in the knob. The connecting rod and the knob are connected by threads, and the lower part of the knob can abut or separate from the upper surface of the arc plate.
[0013] Preferably, the lifting assembly includes an upper support plate and a slot, the slot is fixedly arranged on the upper surface of the upper support plate, a circular boss arranged on the bottom of the rotating plate extends into the slot, and the upper support plate is rotatably connected to the circular boss on the rotating plate through the slot.
[0014] Preferably, the base includes a bottom plate, universal wheels are arranged at the four corners of the lower surface of the bottom plate, a brake device is arranged on the universal wheels, and an armrest is arranged at a position close to the end of a fixing frame arranged on the upper surface of the bottom plate.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] The utility model provides a movable indoor pipe hoist provided with a lifting component and a lifting component. The lifting component is lifted once by a screw-nut mechanism, and the lifting component is lifted twice by a scissor mechanism, which is convenient for the device to be moved and used indoors. The lifting height of the device can be reasonably adjusted according to the indoor height, which can expand the range of pipe lifting height and help improve construction efficiency. The device is also provided with an adjusting component, which includes a rotating plate, a clamping plate is arranged on the rotating plate, and the clamping plate is moved by the action of the clamping cylinder to clamp the pipe to be installed. The adjusting component also includes a connecting rod and an arc plate, the connecting rod passes through the arc plate and is fixedly connected to the rotating plate, and the connecting rod moves along the arc plate. The connecting rod can be manually adjusted to move along the arc plate, thereby rotating the rotating plate, adjusting the relative position of the pipe to be installed and the installed pipe, reducing the number of times the base is pushed to adjust the pipe so as to align the pipe, and facilitating the installation of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 This is a structural schematic diagram of a movable indoor pipeline hoist according to an embodiment of the utility model;
[0019] Figure 2 This is a front view of a movable indoor pipeline hoist according to an embodiment of the utility model;
[0020] Figure 3 This is a schematic diagram of the connection structure of the base and the lifting assembly of the embodiment of the utility model;
[0021] Figure 4 This is a schematic diagram of the exploded structure of the connection between the lifting component and the adjusting component of the embodiment of the utility model;
[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the connection between the lifting component and the adjusting component in the embodiment of the utility model;
[0023] Figure 6 This is a schematic diagram of the lifting component structure of an embodiment of the utility model.
[0024] Description of reference numerals:
[0025] 1. Base; 11. Bottom plate; 12. Armrest; 13. Universal wheel; 2. Lifting assembly; 21. Fixed frame; 211. Upper horizontal plate; 212. Lower horizontal plate; 213. Guide groove; 214. Extending plate; 22. Screw rod; 23. Moving plate; 24. Slide rod; 241. Fixed rod; 25. Lifting motor; 3. Lifting assembly; 31. Upper support plate; 32. Lower support plate; 33. Telescopic cylinder; 34. Slot; 35. Hinge; 36. Push rod; 4. Adjusting assembly; 41. Turntable; 411. Mounting groove; 412. Threaded groove; 42. Clamping cylinder; 43. Clamping plate; 44. Fixed plate; 45. Arc plate; 451. Moving groove; 46. Connecting rod; 461. Knob. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] In the following description of the utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" only indicates the connection between devices and has no special meaning.
[0028] For specific embodiments, see Figure 1-Figure 6 A movable indoor pipe lifting machine comprises a base 1, a lifting assembly 2, a lifting assembly 3 and an adjusting assembly 4. The base 1 moves along the ground through a universal wheel 13. The base 1 is provided with a lifting assembly 2. The lifting assembly 2 comprises a moving plate 23. The lifting assembly 2 realizes the rise or fall of the moving plate 23 through a screw nut mechanism. The lifting assembly 3 is provided on the moving plate 23. The adjusting assembly 4 is installed on the lifting assembly 3. The adjusting assembly 4 comprises a rotating plate 41. The rotating plate 41 is rotatably connected to the lifting assembly 3. Clamping plates 43 are symmetrically arranged on both sides of the rotating plate 41. A pipe to be installed is arranged between the two clamping plates 43. The clamping plates 43 clamp or release the pipe to be installed through the action of a clamping cylinder 42.
[0029] The base 1 includes a bottom plate 11, which is a square plate. Universal wheels 13 are arranged at the four corners of the lower surface of the bottom plate 11, and a brake device is arranged on the universal wheel 13 so that the device can be parked stably; a handrail 12 is arranged at one end of the upper surface of the bottom plate 11 near the end, and a lifting component 2 is arranged on the upper part of the bottom plate 11. Construction workers push the device to move in any direction along the ground through the handrail 12.
[0030] The lifting assembly 2 also includes a fixing frame 21, a screw rod 22 and a lifting motor 25; the fixing frame 21 is fixedly arranged on one end of the bottom plate 11 close to the handrail 12, and the fixing frame 21 includes two vertically arranged columns, the two columns are respectively located on both sides of the bottom plate 11, and a guide groove 213 is arranged on the side away from the handrail 12 of the two columns, an upper horizontal plate 211 is fixedly arranged between the upper parts of the two columns, and the middle part of the upper horizontal plate 211 extends in the direction away from the handrail 12 to form a convex block, and a perforation is arranged on the side of the convex block close to the lower horizontal plate 212, and a guide groove 213 is fixedly arranged between the lower parts of the two columns. The lower horizontal plate 212, the middle part of the upper end of the lower horizontal plate 212 extends in the direction away from the handrail 12 to form an extension plate 214, and the extension plate 214 is penetrated by two through holes, and the second through hole corresponds to the first through hole on the upper horizontal plate 211; the upper end of the screw rod 22 extends into the first through hole on the upper horizontal plate 211 and is rotatably connected to the upper horizontal plate 211, and the lower end of the screw rod 22 passes through the second through hole on the extension plate 214 and is rotatably connected to the extension plate 214; the lifting motor 25 is fixedly arranged under the extension plate 214, and the output shaft of the lifting motor 25 passes through the second through hole on the extension plate 214 and is fixedly connected to the screw rod 22.
[0031] The lifting assembly 2 also includes a slide bar 24, which is arranged on the end of the bottom plate 11 away from the handrail 12. Two slide bars 24 are arranged, and the lower ends of the two slide bars 24 are respectively fixedly arranged on both sides of the bottom plate 11. The upper ends of the two slide bars 24 are fixedly connected by a fixing rod 241 to improve the connection stability of the slide bars 24; the movable plate 23 is horizontally arranged above the bottom plate 11, and a guide block is arranged on the side of the movable plate 23 close to the fixed frame 21. Two guide blocks are arranged, and the two guide blocks are respectively matched with the guide grooves 213 on the two columns of the fixed frame 21. The movable plate 2 The movable plate 23 is slidably connected with the guide groove 213 on the fixed frame 21 through the guide block, and movable holes are provided at both corners of one end of the movable plate 23. A nut block is provided in the middle of the other end of the movable plate 23, and the screw rod 22 passes through the nut block and is connected with the nut block through threads; the two sliding rods 24 pass through the movable holes on the movable plate 23 respectively and are slidably connected with the movable plate 23; when the lifting assembly 2 is used, the lifting motor 25 is started, and the output shaft of the lifting motor 25 drives the screw rod 22 to rotate, thereby driving the movable plate 23 to rise or fall, so that the lifting assembly 3 and the adjusting assembly 4 rise or fall.
[0032] The lifting assembly 3 is the prior art, and the lifting assembly 3 includes an upper support plate 31, a lower support plate 32, a telescopic cylinder 33 and two groups of symmetrically arranged scissor units, the upper part of each group of scissor units is rotatably connected to the upper support plate 31, and the lower part of each group of scissor units is rotatably connected to the lower support plate 32. A slot 34 is fixedly arranged on the upper surface of the upper support plate 31 for connecting the adjustment assembly 4; the lower surface of the lower support plate 32 is fixedly arranged on the movable plate 23; the two groups of scissor units are connected by support rods, and each group of the scissor units includes a plurality of scissor units connected in sequence from top to bottom, and each scissor unit includes two groups of scissor-shaped connecting rods, and the two groups of connecting rods are rotatably connected, one of the connecting rods of the scissor unit located at the bottom is rotatably connected to the lower support plate 32, and the other connecting rod is rollingly connected to the lower support plate 32 through a pulley, and one of the connecting rods of the scissor unit located at the top is rotatably connected to the upper support plate 31, and the other connecting rod is rollingly connected to the upper support plate 31 through a pulley.
[0033] The lifting assembly 3 also includes an articulated joint 35 and a push rod 36. The push rod 36 is arranged in the middle of the two uppermost scissor-type units. Two articulated joints 35 are arranged, one of which is fixedly arranged in the middle of the lowermost support rod, and the articulated joint 35 is located at the end away from the pulley. The articulated joint 35 is rotatably connected to the fixed end of the telescopic cylinder 33, and the other articulated joint 35 is fixedly arranged in the middle of the push rod 36, and is rotatably connected to the telescopic end of the telescopic cylinder 33. The telescopic end of the telescopic cylinder 33 is extended or shortened, driving the connecting rod to move, thereby making the two scissor-type units move synchronously, driving the upper support plate 31 to rise or fall.
[0034] A circular boss is arranged at the bottom of the rotating plate 41, and the circular boss is plugged into the slot 34. The rotating plate 41 is rotatably connected to the slot 34 through the circular boss. A threaded groove 412 is arranged on the side of the rotating plate 41 away from the lifting component 3. Mounting grooves 411 are symmetrically arranged on both sides of the rotating plate 41. A clamping cylinder 42 is horizontally arranged in the mounting groove 411. The fixed end of the clamping cylinder 42 is fixedly connected to the mounting groove 411, and the telescopic end of the clamping cylinder 42 is fixedly connected to the clamping plate 43. The lower part of the clamping plate 43 is inserted into the mounting groove 411, and the mounting groove 411 is slidably connected. The opposite sides of the two clamping plates 43 abut or separate from the side wall of the pipeline, which is used to clamp or loosen the pipeline, and is suitable for pipelines of different diameters.
[0035] The adjustment assembly 4 also includes a fixed plate 44, an arc plate 45 and a connecting rod 46; the fixed plate 44 is fixedly arranged on the upper support plate 31, and the upper part of the fixed plate 44 close to the rotating plate 41 is fixedly connected to the arc plate 45, and an arc-shaped movable groove 451 is penetrated on the arc plate 45; the lower part of the connecting rod 46 passes through the movable groove 451 and extends into the thread groove 412, and is fixedly connected to the thread groove 412, and the connection method can be threaded connection, an external thread is arranged on the upper part of the connecting rod 46, and a knob 461 is sleeved on the connecting rod 46, and an internal thread is arranged in the knob 461, and the connecting rod 46 is connected to the knob 461 by a thread, and the lower part of the knob 461 can abut or separate from the upper surface of the arc plate 45, which is used to fix or loosen the rotating plate 41, and the construction personnel can make the connecting rod 46 Move along the inside of the movable groove 451, thereby adjusting the relative position of the clamping plate 43 on the rotating plate 41, so that the angle of the pipeline is adjusted along the horizontal plane, reducing the number of times the pipeline is adjusted for pipeline alignment, and facilitating pipeline installation; when the adjustment component 4 is in use, the pipeline to be installed is placed on the rotating plate 41, and the clamping cylinder 42 is started, so that the telescopic end of the clamping cylinder 42 drives the clamping plate 43 to extend or shorten, and clamp the pipeline to be installed; after the adjustment component 4 moves to the appropriate position, the knob 461 is adjusted to separate it from the arc plate 45, and the construction personnel rotate the connecting rod 46 to move the connecting rod 46 in the rotating plate 41, thereby adjusting the relative position of the clamping plate 43 and the pipeline to be installed, until it moves to the appropriate position, and the knob 461 is adjusted to abut against the arc plate 45 to fix the relative position of the rotating plate 41.
[0036] The use process and working principle of this device:
[0037] Place the pipe to be installed on the rotating plate 41, start the clamping cylinder 42, so that the telescopic end of the clamping cylinder 42 drives the clamping plate 43 to extend or shorten to clamp the pipe; push the handrail 12 to move the device to the installation position of the pipe to be installed, and adjust the universal wheel 13 to fix the device;
[0038] Start the lifting motor 25, the output shaft of the lifting motor 25 drives the screw rod 22 to rotate, thereby driving the moving plate 23 to rise, so that the lifting component 3, the adjusting component 4 and the pipeline to be installed rise to the highest position; start the telescopic cylinder 33, the telescopic end of the telescopic cylinder 33 moves, driving the upper support plate 31, the adjusting component 4 and the pipeline to rise to a suitable position;
[0039] Adjust the knob 461 to separate it from the curved plate 45, and the construction personnel rotate the connecting rod 46 to move the connecting rod 46 in the rotating plate 41, thereby adjusting the relative positions of the clamping plate 43 and the pipe to be installed until it moves to a suitable position, and adjust the knob 461 to abut against the curved plate 45, fix the relative position of the rotating plate 41, and connect the pipe to be installed with the previous pipe section.
[0040] The utility model provides a movable indoor pipe hoist provided with a lifting component and a lifting component. The lifting component is lifted once by a screw-nut mechanism, and the lifting component is lifted twice by a scissor mechanism, which is convenient for the device to be moved and used indoors. The lifting height of the device can be reasonably adjusted according to the indoor height, which can expand the range of pipe lifting height and help improve construction efficiency. The device is also provided with an adjusting component, which includes a rotating plate, a clamping plate is arranged on the rotating plate, and the clamping plate is moved by the action of the clamping cylinder to clamp the pipe to be installed. The adjusting component also includes a connecting rod and an arc plate, the connecting rod passes through the arc plate and is fixedly connected to the rotating plate, and the connecting rod moves along the arc plate. The connecting rod can be manually adjusted to move along the arc plate, thereby rotating the rotating plate, adjusting the relative position of the pipe to be installed and the installed pipe, reducing the number of times the base is pushed to adjust the pipe so as to align the pipe, and facilitating the installation of the pipe.
[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A movable indoor pipeline hoist, characterized in that: The invention comprises a base (1), a lifting assembly (2), a lifting assembly (3) and an adjusting assembly (4); the base (1) moves along the ground via a universal wheel (13); the base (1) is provided with a lifting assembly (2); the lifting assembly (2) comprises a moving plate (23); the lifting assembly (2) realizes the lifting or lowering of the moving plate (23) via a screw nut mechanism; the moving plate (23) is provided with a lifting assembly (3); the lifting assembly (4) is installed on the lifting assembly (3); the adjusting assembly (4) comprises a rotating plate (41); the rotating plate (41) is rotatably connected to the lifting assembly (3); clamping plates (43) are symmetrically arranged on both sides of the rotating plate (41); a pipeline is arranged between the two clamping plates (43); the clamping plates (43) realize clamping or loosening of the pipeline through the action of a clamping cylinder (42).
2. A movable indoor pipeline hoist according to claim 1, characterized in that: The lifting assembly (2) further comprises a fixed frame (21) and a screw rod (22); the fixed frame (21) is fixedly arranged at one end of the base (1); a guide groove (213) is arranged on one side of the fixed frame (21); the screw rod (22) is rotatably arranged in the middle of the fixed frame (21); the middle of the movable plate (23) is threadedly connected to the screw rod (22); and the side of the movable plate (23) is slidably connected to the guide groove (213).
3. A movable indoor pipeline hoist according to claim 2, characterized in that: A guide block is arranged at one end of the movable plate (23) close to the fixed frame (21), and the movable plate (23) is slidably connected to a guide groove (213) on the fixed frame (21) through the guide block. A nut block is arranged through the middle of another end of the movable plate (23) close to the fixed frame (21), and the screw rod (22) passes through the nut block and is connected to the nut block through a thread.
4. The movable indoor pipeline hoist according to claim 1, characterized in that: The bottom of the rotating plate (41) is rotatably connected to the lifting assembly (3), and mounting grooves (411) are symmetrically arranged on both sides of the rotating plate (41). A clamping cylinder (42) is horizontally arranged in the mounting groove (411), and the telescopic end of the clamping cylinder (42) is fixedly connected to the clamping plate (43).
5. The movable indoor pipeline hoist according to claim 4, characterized in that: The fixed end of the clamping cylinder (42) is fixedly connected to the mounting groove (411), the lower part of the clamping plate (43) is inserted into the mounting groove (411), and the mounting groove (411) is slidably connected, and the opposite sides of the two clamping plates (43) are in contact with or separated from the side wall of the pipeline.
6. The movable indoor pipeline hoist according to claim 5, characterized in that: The adjustment assembly (4) further comprises a fixed plate (44) and an arc-shaped plate (45); the fixed plate (44) is fixedly arranged on the upper lifting assembly (3); an upper portion of the fixed plate (44) close to the rotating plate (41) is fixedly connected to the arc-shaped plate (45); and an arc-shaped movable groove (451) is provided through the arc-shaped plate (45).
7. The movable indoor pipeline hoist according to claim 6, characterized in that: The adjusting assembly (4) further comprises a connecting rod (46), a thread groove (412) being arranged on a side of the rotating plate (41) away from the lifting assembly (3), the lower portion of the connecting rod (46) passing through the movable groove (451) and extending into the thread groove (412), and being fixedly connected to the thread groove (412), an external thread being arranged on the upper portion of the connecting rod (46), and a knob (461) being sleeved on the connecting rod (46), an internal thread being arranged inside the knob (461), the connecting rod (46) and the knob (461) being connected by threads, and the lower portion of the knob (461) can abut against or be separated from the upper surface of the arc plate (45).
8. The movable indoor pipeline hoist according to claim 4, characterized in that: The lifting assembly (3) comprises an upper support plate (31) and a slot (34); the slot (34) is fixedly arranged on the upper surface of the upper support plate (31); a circular boss arranged on the bottom of the rotating plate (41) extends into the slot (34); and the upper support plate (31) is rotatably connected to the circular boss on the rotating plate (41) via the slot (34).
9. The movable indoor pipeline hoist according to claim 1, characterized in that: The base (1) comprises a bottom plate (11), universal wheels (13) are arranged at four corners of the bottom surface of the bottom plate (11), a brake device is arranged on the universal wheels (13), and a handrail (12) is arranged at a position close to the end of one end of a fixing frame (21) arranged on the top surface of the bottom plate (11).
Citation Information
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