JP2010261286A - Portable high-lift work platform with separable extensible lifting/lowering frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such problems in replacing an illuminating lamp of a gymnasium that: a conventional implement is dangerous; use of a ladder involves a risk of fall of a worker working at a high place of a ceiling as there is no wall though the cost is low; a rolling tower forces an improper posture on the worker since there is a difference in height from a floor surface to the ceiling between a center of the gymnasium and the part near a window, involves a risky occasion where a stepladder is installed on the top, involves a risk upon lifting from and lowering to the floor, and needs a wide floor space upon carrying it in and assembling and carrying it out and disassembling, though the rolling tower seems to be comparatively safe; a hydraulic tower lift cannot be carried into the gymnasium on an upper floor having an access only by stairs as the own weight is large, though the use thereof is safe; and an expensive automatic lifting and lowering type illumination lamp needs to be repaired at a high place upon failure though it is prevailing. <P>SOLUTION: Support for the work at the high place can be achieved irrespective of what kind of place the gymnasium is, by developing and manufacturing a separable and portable high-lift work platform, in which lifting and lowering by extension and contraction is performed based on a selective system between electric operation and manual operation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

It is a portable work platform with a detachable telescopic frame that supports work in indoor high places such as exchanging lights on the ceiling of a gymnasium.

Conventionally, movable tools for working at heights include stepladders, ladders, wheeled assembly scaffolds (rolling towers), construction scaffolds, aerial work vehicles, and the like. There is also an aerial work machine that hydraulically expands and contracts a multi-stage pantograph shape to raise and lower the upper workbench. There are also tower lifts that can work at a high place by extending and retracting multistage masts by using hydraulic pressure, and boom lifts that can be used by folding or extending and retracting arms. In both cases, the movement in the horizontal direction includes a battery-operated motor self-propelled type and a moving type by an automobile engine, in addition to the manual push by the carriage. In addition, tools for moving objects to high places include a pneumatic hoist and a hydraulic lift.

The present invention was developed because it is necessary to replace, repair, and install the ceiling lamps safely and quickly in any gymnasium. Until now, tools for working at heights have had physical limitations in use. In a gymnasium located on the floor as a school location, that is, a gymnasium that only enters and leaves stairs without an elevator, the movable tool is a three-stage ladder or a wheeled assembly scaffolding (rolling tower). The other tools in the “background art” cannot be carried in due to weight and size problems, or the cost of setting up is large, and the use of the tools due to the strength of the floor surface is impossible.

When using a three-level ladder, the top of the ladder is hung on a protruding part such as a steel frame that supports the beam or roof of the building, and measures are taken to prevent slipping on the floor. In the uppermost stage, measures are taken to prevent slipping with a rope, and then both feet are entangled with a ladder stage. Since there is a limit to the reach of both hands, there is a risk of one sliding with the thrill. Using a rolling tower looks safer compared to a ladder. However, at the center of the gymnasium and the edge of the window, the height from the ceiling and floor is different, which makes it impossible to work at the top. There is a dangerous scene where a stepladder is installed at the top. In addition, there is a danger when climbing up and down from the floor. A large space is required for assembly and loading / unloading. The present invention changes this safely.

There is also a high lift tower lift that pushes and expands and retracts a multi-stage mast with hydraulic pressure, but it cannot be used for gymnasiums on the upper floor because its weight is heavy and it is impossible to carry it in parts. The hydraulic and pneumatic types do not reach the gymnasium ceiling height, and are awkward to operate and dangerous for humans. The atmospheric pressure type has an environmental problem due to too much CO2 emission. A full-fledged scaffolding stage in a gymnasium with a finished floor is safe to work with, but it takes a lot of time and money and poses danger to the surroundings. Self-propelled aerial work platforms also have elements that can damage the floor. The present invention also changes these safely.

The present invention develops and manufactures an unprecedented aerial work platform for the purpose of conducting a business that can safely support aerial work regardless of the location and passage of the gymnasium, and performs its service. , To achieve the purpose. The detailed means will be described below.

[Safety first solution]
The movement of the “portable work platform with a detachable telescopic lifting frame” according to the present invention that achieves the object is a hand-push type and can be transported by a normal elevator.
○ At the end of the movement to the place where the lifting and lowering operation is completed, the horizontal leg can be fixed and the horizontal state can be maintained at the same time by the extension leg with the level adjustment function, and the lifting is always in the vertical direction.
○ The length of the extension leg with leveling function is selectable and variable.
○ Fixing to the floor is a method of pressing down with its own weight with the screwed leg at the end of the overhanging leg.
○ Since a curing plate is added to the surface of the floor contact area, there will be no damage such as dents and scratches on the floor.
○ Since it is self-supporting, it is possible to safely move the worker to a high place even if there are no walls around.
○ Elevation can be done with reliable leveling even in the middle of slopes and steps.

[Elevating mechanism]
○ Elevation function can be selected between electric and manual.
○ The lifting mechanism is a wire rope hoisting system using a winch.
○ The relationship between the wire rope winding and the lifting function will be described in paragraph No. 0029 and below.
○ It is possible to move up and down in the middle of the stage steplessly to reach the ceiling height of every corner of the gymnasium.
○ Lifting operation can be selected in the workbench and on the floor supporter side.

[Fall prevention]
○ The ratio of height to extension leg width does not exceed 4: 1 at the highest position of the workbench to prevent toppling.
○ To prevent tilting and overturning, load weight should be up to 1/2 of the weight of the main unit.
○ Handrails are attached to the work table on all sides to prevent falling.
○ A lightweight divider is attached to the platform handrail and the lower half of the platform floor to prevent the replacement lights and tools from falling.
○ When getting into the workbench, one side of the handrail is manually opened and closed like a door.
○ After getting on the workbench, the door can be locked.
○ The climbing speed can be adjusted steplessly, and for safety, it does not exceed 7m / 35 seconds.
○ The descent speed can be adjusted steplessly and does not exceed 7 m / 25 seconds for safety.
○ In the unlikely event that neither electric nor manual operation is possible at the highest ascent position, the operator can descend by himself.

[Hand-carried]
○ You can move to the location by hand on the stairs by dividing the main body.
○ It is possible to carry in parts at high places after reassembly by individually carrying in parts with dimensions and weight that can be carried by hand.
○ After the work at a high place is completed, it is possible to carry it out again.
○ The total weight of the main body should be as light as possible without reducing the required strength.
○ Normally, the main body is placed vertically, but it can also be placed horizontally.
○ It can be manually pushed when the main body is placed vertically or horizontally.
○ The main body can be transported vertically or horizontally on a small truck bed. A regular car can be transported horizontally in a one-box van.
○ If the size of the sill and the duck are low on the route of loading and unloading, it is possible to pass through the main body by hand. The elevator can be installed vertically with the work table removed.

The `` portable work platform with splittable telescopic lifting frame '' of the present invention enables people to move safely and easily, quietly and to high places, and can be used in school gymnasiums everywhere. developed. It can also contribute to the safety of high-altitude work in other locations. In addition, there is a service robot aspect, and there are future development possibilities. Service robots can be useful to many publics because they reach the high ceiling just like a person's height has been pinpointed. It's like “Elevator everywhere”.

There are many cases where gymnasium lighting has an automatic lifting device, but there is a failure such as the device not getting down or not being raised due to the failure of the device, so the necessity at this time is great.

The fact that it can be used indoors is not limited to a gymnasium, and can be used outdoors in places where high-altitude work vehicles cannot be entered.

[Typical locations where it can be used]
According to the current school directory, the number of gymnasiums in the school is 142. In Adachi-ku, where the company is located, there are 142 municipal and private elementary and junior high schools, high schools, nursing schools and other schools and sports facilities. In Tokyo, there are 2,867 schools including secondary schools, special support schools, technical colleges and universities. There are 52,151 gymnasiums for school gymnasiums and welfare / welfare purpose sports facilities and for-profit sports facilities nationwide.

[Other available locations]
○ Entrance, hall, auditorium, parliament building, stage of a government building with a colonnade.
○ High-ceilinged accounting waiting room in a large hospital.
○ Museum exhibition room, auditorium seats and stage, cinema.
○ The inside and outside of the temple and shrine buildings, the church ceiling, the fishing lanterns around the precincts, the mountain gate, the ceiling under the roof and the torii.
○ Hotel lobby, station hall hall platform, department store with atrium.
○ High ceiling factory, warehouse, large zoo cage, high ceiling facility, event venue.
○ Others, such as a high wall without a ceiling or a high outer wall.

〔Intended use〕
○ Support for work such as installation, replacement, and repair of high ceiling lighting.
○ Support for work such as inspection, installation, replacement, and repair of facilities on high ceilings.
○ Supporting work such as vertical wall piping and painting to reach the rooftop.
○ Support for observation and photography from high places.
○ Other support for human and physical movement to high places.

[Contribution to the environment]
The movement is pushed by hand, the raising and lowering is by electric or manual selection, and the amount of CO2 emission is less than that of other high-altitude working machines such as pneumatic and hydraulic. An aerial work vehicle emits exhaust gas, but in the present invention, there is no exhaust gas during operation.

Since it is not necessary to select an expensive automatic elevating type lighting fixture, it is possible to significantly reduce the construction cost. On the ceiling of the gymnasium, badminton shuttles and balls used for ball games may be left behind on the ribs of steel beams, folded basketball frames, or in the nets of illuminators. This can be easily recovered.

Restoration work at a high place where a large number of unspecified people come and go is possible in a short time.

Designed and manufactured “Portable work platform with split telescopic lifting frame” in-house.

Make its use.

Do that service.

[Services]
Set a common name and work together with the service mark to conduct business activities that safely support high-altitude work. The explanation related to the claims of the present invention will be described below. It is about a manufacturing process, an assembly process, raising / lowering operation, and the loading method to a vehicle.
(Production process)

[Structure of lifting frame]
The structure of the telescopic lifting frame 1 has a rectangular cross section and small surfaces at the four corners. The length is approximately the height of the main body when a plurality of lifting frames are combined, so the length should be such that it can pass through the standard gymnasium entrance and elevator doors. Each lifting frame is a large and narrow hexahedron. Even in the hexahedron, each side has a lot of space, and the reason why only the straight portion of the corner and the crossed diagonal line portion are made of metal is to reduce the weight without reducing the strength. Since it is elongated in the vertical direction, the center part is easy to bend. In order to maintain the straightness by suppressing the bend, the four sides are welded to the ramen structure and finished flat. The reason for flattening the surface is that it becomes a sliding contact mechanism when the elevating frames of each step are inserted. Both the top and bottom surfaces of the pulley face inward. That is, the inside of the elevating frame part 1 is a passage between the pulley and the wire rope. Precisely, the base of the bottom pulley is facing upward, the top of the top is facing sideways inside, and the top is lined up in the order of steps. A detailed description of the relationship will be given in the pull balancer mechanism of paragraph number 0031. Each step on the bottom is arranged with the front and rear added to the left and right in the order of the frame. A connection point at the tip of the wire rope portion 7 is formed in the center of the bottom surface of the innermost frame of the lifting frame portion 1. This connection point is detachable but requires a lock.
(Assembly process)

[Initial assembly]
In FIG. 2 (a), the initial assembly of the portable work platform with a detachable telescopic lifting frame is performed by attaching the outermost frame part of the telescopic lifting frame part 1 to the center of the carriage part 4 in the order of dimensions. While inserting the part 1 into the inside, the inner packaging is stacked and attached. The getting-on / off step portion 5 is attached so as to connect the upper side surface of the outermost frame of the telescopic lifting frame portion 1 and the cart portion 4. The overhanging leg vertical receiving part 9 and the side pillar part 16 are attached. When inserting each raising / lowering frame part 1, there exists order and direction. Work can be done both vertically and horizontally.

[Elevating function assembly]
Inside the telescopic elevating frame part 1 incorporating several frames, an elevating functional part pulley part 3 and a wire rope part 7 are arranged, and the axis of the pulley part 3 is a pull balancer inside the upper and lower sides of each frame step. The winch part 6 is attached to the inside of the getting-on / off step part 5 or the cart part 4 by the part 3a. The wire rope section 7 is tied through the arrangement order of the pulley sections 3 at each stage inside each frame to complete the lifting function. Usually, the vehicle is loaded in the style shown in FIG. It is also the state when pushing and moving to the gymnasium.

[Inclination and fall prevention function assembly]
The length of the extension leg portion 8 with the level adjustment function is selected and attached to the cart portion 4. The overhanging leg oblique column part 10 is fixed to the outer upper part of the telescopic lifting frame part 1 and the tip of the overhanging leg part 8 with a horizontal adjustment function. Place the on-site curing plate part 17 on the floor, and based on the level in the cart part 4, adjust the level with the square screwed leg part 8a at the tip of the extension leg part 8 with the level adjustment function and press the floor. By all means, provide vertical lift.

[Final assembly process]
The work table 2 is placed on the innermost frame of the telescopic lifting frame 1 that is the uppermost part and fixed. Check if there are any abnormalities in the wire rope route and whether there are any abnormalities in the state of the lifting function and the fall prevention function. Connect the connector of the remote control switch to the electric winch, plug in the power, and perform a test run before work. Fix the remote control switch to a dedicated installation location on the workbench or pass it to the floor supporter.
(Lifting operation)

[Conceptual diagram of telescopic lifting function]
In FIG. 2B, the worker A in FIG. 1 climbs the boarding / exiting step unit 5 by about 1.8 m, grabs the handrail column of the workbench 2 with his hand, and steps on the top plate of the boarding / exiting step unit 5. When you get into the door and lock the door and divider, the electric remote control switch with speed adjustment is in the right front corner of the handrail. The switch can be removed and handed over to the floor supporter for operation. FIG.3 (c) represents as a concept the mechanism of the pulley part 3 and the pull balancer part 3a of each step at the time of raising / lowering. Since the direction of the pulley 3 constantly changes slightly as shown in (b) and (c) of FIG. 4 along with the displacement in the tension direction during the up-and-down operation, the intermediate progress diagram is omitted and the fraction number in FIG. As in (c), only the result is expressed as a conceptual diagram. In the actual machine, the elevating frames 1a to 1f are included in each other, but in order to make the wire rope line easy to understand, the frames are divided into adjacent ones.

[Elevating frame and winch]
3 (c), the top pulley unit 3 and the pull balancer 3a on the outermost frame of the lifting frame unit 1f are fixed pulleys that serve as a bridge between the wire rope unit 7 and the winch unit 6. The inside of the elevating / lowering frame portion 1 and all the pulley receivers of the pulley portion 3 have this pull balancer function. A large pulley portion 3 b is provided in the middle of the wire rope portion 7 that continues to the winch portion 6, and the tension direction of the wire rope portion 7 is changed. The purpose of this is to always stabilize the direction of the winding and unwinding of the winch part 6 and to absorb the shock to the winch part 6 if the pulley receiver or pull balancer part 3a of the lifting frame part 1 breaks during operation. There is an aim. There are two attachment positions of the winch portion 6. It is a case where it fixes to the trolley | bogie part 4, and a case where it hangs under the top | upper surface of the boarding / alighting step part 5. FIG. This is the latter in this figure. In any case, the inside of the telescopic lifting frame portion 1 of the wire rope route is provided with a space where all the hands can reach, so that early detection of abnormality and visual inspection at any time can be performed, and tactile sensation at the time of stop is also possible. FIG. 3B is a diagram when the main body is contracted as a telescopic lifting frame including a lifting frame having a ramen structure. Similarly, (a) is during elongation. H1 is an initial work platform floor height, and H2 is a work platform floor height when moving up and down. H1 is constant, H2 is finite but stepless.

[Pull balancer mechanism]
When a pulley is pulled in two or more directions by a wire rope that passes through the pulley, the pulley changes the direction of the rotating shaft to an intermediate position in the tension direction during rotation or stoppage, and performs a balance operation to stabilize the direction. There is. Because it is a phenomenon that instantaneously changes its direction to the average position in response to multi-directional attraction, it is called a pull balance phenomenon, and this mechanism is used to instantly determine the direction of the rotation axis of the pulley as a pull balancer mechanism. The shape and arrangement of the pulley receiver. Although it is a fixed pulley that responds sensitively to the tension direction of the wire rope that changes slightly every time the lifting frame 1 is extended, its fixed position moves up and down, so that it also works as a moving pulley, The direction of tension changes slightly for both the horizontal and vertical components. If this change cannot be dealt with instantly, the wire rope may be bent and disengaged and kinked and deformed. The pull balancer mechanism was developed to eliminate this problem and protect the smooth lifting function and wire rope. Thus, the lifting operation can be described as an operation of maintaining the balance of the pulley by the pull balancer mechanism.

In detail, the lifting frame 1 has only one side surface among the four side surfaces, and does not include the shaded portion of the ramen structure, and ensures strength only in the vertical direction and the vertical direction. Since this surface becomes a wire rope route as a passage for a wire rope that moves up and down of each lifting frame during the lifting operation, a large vertical and horizontal space is required. Therefore, the pulley receiver on the bottom surface of the elevating frame portion 1 that becomes an obstacle of the wire rope route solves the problem by the difference in depth between the front and rear. The position of the receptacle differs depending on each frame, and the level is different. This is because when they are the same, they overlap each other during expansion and contraction, and each other becomes an obstacle, and expansion and contraction to a high place becomes impossible. The arrow KP1 in FIG. 4B has a fixed dimension because it is the upper and lower pulley portions 3 of the same lifting frame portion 1. Similarly, KP2 is displaced because the upper and lower pulley parts 3 of the adjacent lifting frame part 1 are displaced. In other words, the distance between the pulleys that changes during the up-and-down movement changes the dimension between them. The number is proportional to the number of frames of the lifting frame portion 1. When the distance between the adjacent upper and lower pulley parts 3 is changed in this way, the pull balancer part 3a and the pulley part 3 of the pulley receiver that are slightly shifted to the left and right for the purpose of preventing a collision, The same is true for the descent of the wire rope changing in tension. The pull balancer mechanism instantly responds to this phenomenon.

The rotating shaft of the pulley applies a sliding contact surface to the unthreaded portion of the hex bolt body as a shaft. The number of revolutions is not so fast because it does not exceed 70 revolutions per minute. The shaft is used in the form that a pulley enters the shackle body. As shown in FIG. 4A, one side of the shackle is a female screw, and the screw is tightened through the shaft. A double nut will be hung on the outside. As described above, the pulley is not fast enough to rotate, but as an example other than a double nut for fixing the shaft, a process of inserting a penetrating pin into the shackle and the shaft is performed. This is because if the pulley is not fixed, the shaft will rotate even if the pulley is not fast, and the shaft may fall off. In order to completely prevent this, the double nuts are used in this figure. FIG. 4 (c) is an actual view in which the eyebolt ring is passed through the U-shaped portion of the shackle body before (a). A gap is secured with the wire rope. This is not limited to eyebolts, but may be a chain or a U-shaped bracket. The type is determined based on the usage environment. Select the size based on strength. By doing so, the above-mentioned problems can be solved, the wire rope is protected, and the lifting operation is performed safely. FIG. 4 (b) is also a view showing that the fixed pulley continuously functions as a moving pulley.
(Loading method on vehicle)

[Wheels with retractable legs]
An example of FIG. 5 is a wheel portion 14 with a retractable leg, in which a caster wheel is fixed by providing a dedicated pedestal on one side of the rhombus pantograph, and is a dedicated pedestal with a link mechanism caster wheel retractable leg. The operation changes the angle of the pantograph by the operation of tightening and loosening with the square screw penetrating the central intersection of the pantograph, and the caster wheel ground floor height H can be changed. When the main body of the present invention has the vertical / horizontal conversion function 13 and the vehicle is retracted, a corner like a bag is formed between the loading slope portion 11 and the vehicle. This is also in other places. In one example, there is a slope when going up to the gymnasium, and if the slope of the slope to the saddle at the final rise is steep, the distance between the wheels, that is, if the wheel base is wide, the phenomenon that the lower part of the main body touches the saddle will occur. The problem occurs. In order to solve this problem, the wheel height was changed, and it was developed for the purpose of straddling obstacles on the way. Another problem is solved by changing the height of the wheel. For example, when the main body hits the duck of the rear door of the ordinary car in this figure, it is possible to pass by lowering the height.

[Vertical / Horizontal conversion of the main unit]
The purpose of eliminating the problem of passing through a place that cannot be passed vertically by loading and unloading the main body and the purpose of being able to carry it horizontally when loading the vehicle are achieved. FIG. 6A is a view in which the vertical / horizontal conversion twin pipe 13a is attached at a fixed position to the main body in the state of assembly of the paragraph number 0026 lifting function section. In (b), when the main body of the vertical / horizontal conversion twin pipe 13a is moved forward by two persons, the work table 2 is made useful by changing the role to the vertical / horizontal conversion table 13b, and the upper portion of the main body is temporarily deposited. (C) is a figure in which the hand is changed and the vertical / horizontal conversion twin pipe 13a is removed, and then soft landing is performed again horizontally by two persons. (D) is the removed vertical / horizontal conversion twin pipe 13a and vertical / horizontal conversion table 13b. In the opposite case, this work operation is performed in the reverse order.

[Vehicle loading diagram of the main unit]
A vehicle loading method will be described. The vertical / horizontal conversion function 13 is used. The slope steel frame twin part 11a is placed on the rear bumper of the vehicle, and the control panel of the loading slope part 11 is laid on the bumper so that the height is the same as the vehicle cargo room floor. Insert the stopper 11b. The in-vehicle pull-in and fixing portion 12 is set in the vehicle and the eye bolt ring attached to the head of the getting-on / off step portion 5 is put on the tip and pulled into the vehicle. It is a mini winch puller. At the pull-in end position, the vehicle is fixed in the vehicle with a constrictor. All other parts, including the sign, can be loaded in the space of the cargo compartment in the vehicle. When pulling out from the vehicle, this is the reverse work operation.

  Figure showing the lifting operation   Figure showing assembly completion of the present invention   Lifting mechanism diagram   Pull balancer mechanism diagram   Wheel with retractable legs   Vertical / horizontal conversion diagram   Vehicle loading diagram of the main body (normal car one box van)

A worker 1 telescopic lifting frame 2 work platform (work stage) (13b)
DESCRIPTION OF SYMBOLS 3 Pulley part 3a Pull balancer part 3b Large pulley part 4 Carriage part 4a Carriage part Rotation caster 4b Carriage part fixed caster 5 Getting on / off step part 6 Winch part 7 Wire rope part 8 Overhang leg part with level adjustment function 8a Square screw leg 9 Overhanging leg vertical receiving part 10 Overhanging leg oblique part (13a)
DESCRIPTION OF SYMBOLS 11 Loading slope part 11a Slope steel frame twin part 12 Car interior drawing and fixing | fixed part 13 Vertical / horizontal conversion function 13a Vertical / horizontal conversion twin pipe (10)
13b vertical / horizontal conversion table (2)
14 Lower wheel portion with retractable leg 15 Upper wheel portion 16 Side pillar portion 17 On-site floor curing plate portion 18 Emergency escaper connection portion 19 Extension preventive device for expansion / contraction lifting frame The following is a drawing omitted part 11b Displacement retaining portion 20 Step clearance elimination road Board (Square and road board)
21 Emergency escaper (Rope ladder, etc.)
22 Curing board (panel, large and small sizes)
23 Curing sheet (Vinyl, various blankets)
6a power cord 100v15A
6b remote control switch (up / down / speed adjustment)
The following is the part number of FIG. 4 and the explanation of the arrow line (a) K in the arrow line is a pulley, S is a shackle, B is a hexagon bolt, N is a nut, W is a washer (b) KP1 is the same lifting frame, between pulleys Constant distance. KP2 changes the distance between adjacent lifting frames and pulleys.

Claims (5)

An aerial work platform with a telescopic lifting frame that has a space that can be visually inspected and checked by hand. The lifting function is equipped with an extendable lifting frame, and the tension of the wire rope wound from the winch attached to the main body is raised and lowered by using the pull balancer mechanism puller receiver provided inside the expanding and lifting frame. A portable work platform with a detachable telescopic lifting frame for work in high places. When the wire rope passed through the pulley is pulled in two or more directions, the pulley changes the direction of the rotating shaft to the middle position of the tension direction during rotation or stoppage, and uses the phenomenon of balancing operation to stabilize the direction. An elevating work platform with a telescopic lifting frame provided with an elevating function as a mechanism that instantly determines the direction of the rotation axis of the pulley. A wheel with a retractable leg, with a caster wheel fixed on one side of the rhombus pantograph and fixed as a dedicated base with a link mechanism caster wheel retractable leg. The operation changes the angle of the pantograph by the operation of tightening and loosening with the square screw penetrating the central intersection of the pantograph, and enables the change of the ground contact height of the caster wheel. In order to prevent the portable work platform with a detachable telescopic lifting frame of the present invention from falling over when it is extended, the vertical direction of the telescopic lifting operation is in principle. The projecting leg slanted column part 10 that supports the projecting leg part 8 with the horizontal adjustment function that holds the floor under its own weight and prevents falling is supported from the top by the length-and-width conversion twin pipe. The role of supporting the horizontal / vertical conversion operation by human power as 13a is also important. At this time, the height and width of the work table 2 are set to dimensions that can be safely accommodated in the telescopic lifting frame portion 1 as the vertical / horizontal conversion table 13b of the load receiving table. As mentioned above, it is useful for lifting and lowering operations, and in the process of the vertical / horizontal conversion function with different purposes, a portable work platform that can be used effectively with multiple parts that play an important role with different elements is requested. Matters.

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