JP4125587B2 - Lifting and lowering equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elevating / lowering device such as a ladder or a stepladder.
[0002]
[Prior art]
Conventionally, ladders and stepladders have generally been used as lifting equipment with steps, and ladder structures with multiple steps are installed between a pair of legs so that they can move to high places. It is composed of
[0003]
There are various types of ladders as well, from a simple structure consisting of a single ladder structure to a multi-stage type in which these are slidably connected to each other, depending on the application, etc. was there. In particular, ladders used for construction of overhead lines and the like often have a multi-stage structure because it is necessary to extend the ladder to a considerably high place (see, for example, Patent Document 1).
[0004]
In addition, there are some that not only simply function as ladders but also function as stepladders (see, for example, Patent Document 2).
[0005]
[Patent Document 1]
JP-A-2001-342783 [0006]
[Patent Document 2]
Japanese Patent Laid-Open No. 09-088464
[Problems to be solved by the invention]
However, in the above-described conventional ladders and stepladders, although the length and weight of these ladders are increased, the point of facilitating the transportation is hardly taken into consideration. It is natural to carry.
[0008]
However, if you want to use a ladder etc. by moving it to multiple locations, and if the travel distance is too short to use an automobile, etc., or if it is difficult to enter the automobile, it will take two people or more. It must be held, is very troublesome, and there is a risk that work efficiency may be deteriorated.
[0009]
Further, when looking at the ladder, there are many functions that are merely used for raising and lowering, and when other functions are added, the functions as a stepladder are limited as described above.
[0010]
On the other hand, the stepladder is composed of two sets of ladder structures in which the ends are connected to each other so as to be openable and closable. In addition, the stepladder is a step where the ladder structures are opened at a predetermined angle to stand up and work at a high place at the top, but the pair of ladder structures can be used as a ladder by opening 180 degrees. Things are also generally known and can be said to be more versatile than ladders. However, the application is limited to the area as an auxiliary tool for raising and lowering.
[0011]
An object of the present invention is to provide an elevating / lowering instrument that can solve the above-described problems.
[0012]
[Means for Solving the Problems]
(1) In order to solve the above-mentioned problem , in the present invention, a pair of ladder structures are connected to each other so as to be openable and closable to form a ladder-supporting stepladder, and a required number of rolling wheels is provided on one ladder structure. When the ladder structures are attached and opened at about 90 °, the elevator structure with a stepping rail that allows one ladder structure provided with rolling wheels to be used as a carriage part, The ladder structure of the left and right sides of the ladder structure is fixedly attached to the lower position of the left and right pedestal pillars and the center position of the step pedestal spaced apart from both positions by the locking position at the retracted position and the protruding position, respectively, The rolling wheel attached to the center position of the crosspiece was a caster wheel that can rotate freely .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a rolling support wheel for assisting conveyance is provided on a ladder structure in which a step rail is attached in multiple stages between a pair of leg posts.
[0018]
In other words, when a rolling wheel is attached to a ladder structure that constitutes a ladder or a stepladder and the ladder or stepladder is moved, the rolling wheel is pushed and pulled in a grounded state without holding it. It can be moved while being large, and even if it is increased in size and weight, it can be easily moved and transported by one person.
[0019]
Rolling wheel is specifically may attached to pedestal ladder structure, but the attachment position, and a form projecting from the lateral width direction with respect to the ladder structure, in example example case of the ladder was leaned In order to stabilize the posture, an outrigger is provided on the pedestal. In this case, the outrigger can be provided on the pedestal .
[0021]
Preferably, the rolling wheel is detachably attached to a pedestal or / and a foot cross via an attachment member.
[0022]
That is, a rolling wheel can be retrofitted to an existing ladder or stepladder, and can be easily removed if unnecessary. More preferably, the rolling wheel may be attached to a pedestal or / and a pedestal via a mounting member so as to be rotatable. In other words, when it is used as an original work platform as a ladder or a stepladder, it is possible to turn the rolling wheels so that they do not protrude from the pedestal so that they do not get in the way. Even when loaded and transported, the rolling wheels do not get in the way and there is no risk of hitting others.
[0023]
In the case where the above-mentioned lifting and lowering equipment with a stepping bar is used as a ladder and a stepladder, when a required number of rolling wheels are attached to one ladder structure and the ladder structures are opened at approximately 90 °, one of the rolling wheels is provided. The ladder structure can be used as a carriage part.
[0024]
That is, as described above, even if it is a ladder, it can be used as a carriage. However, as described above, if the ladder structures of the stepladders are opened at about 90 °, one ladder structure can be used. The other ladder structure can be used as a handwheel handle while being used as a carriage unit. In this case, a plurality of rolling wheels can be provided to enable stable running, and a full-fledged cart and an inferior conveyance function can be added.
[0025]
As for the number of rolling wheels, for example, the rolling wheels can be attached to the left and right pedestal lower end positions of one ladder structure and the center position of the stepped pedestal spaced apart from both positions by a small number. The stability as a cart can be maintained while suppressing an increase in cost. Also, in this case, the rolling wheels attached to the step rails can be caster wheels that are rotatable in the free direction, and can be conveyed while being steered.
[0026]
Moreover, in this case as well, the rolling wheels can be removed if not necessary, or can be rotated and kept in a stored state so as not to get in the way.
[0027]
As described above, according to the present invention, the ladder and the stepladder can be easily moved and transported, and further, can be diverted to uses other than the intended purpose of use. In addition, since it can be used as a carriage for carrying work tools and the like in connection with ladder work and stepladder work, the work burden on the operator's site can be greatly reduced.
[0028]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0029]
(Reference example)
The lifting / lowering device with a foot cross according to the present invention comprises a ladder structure in which a foot cross is attached in multiple stages between a pair of pedestals, and will be described as a ladder in this reference example. In this reference example, a single ladder is used, but a plurality of ladder structures may be configured to be extendable and retractable in multiple stages. 1 (a) is a front view of the ladder, FIG. 1 (b) is a side view thereof, FIG. 2 is an enlarged front view of the main part of the ladder, FIG. 3 is a side view thereof, and FIG. FIG. 5 is an explanatory view showing a state in which the ladder is conveyed.
[0030]
As shown in FIGS. 1 to 4, the ladder A according to the present reference example is mainly composed of a lightweight aluminum alloy material, and a pair of opposed pillars 1, 1 formed in a predetermined length, A plurality of traverses 2... Are installed between them.
[0031]
A grounding seat 10 is attached to the lower end of each of the pillars 1 and 1 via an end fitting mounting bracket 10a as an end tool that can swing freely. The grounding seat 10 has a base end portion rotatably attached to the side surface of the lower end portion of the pedestal 1 via a rotating shaft 11, and when the ladder A is leaned against a wall surface or the like, the grounding seat is independent of the inclination angle. 10 is firmly attached to the grounding surface and can stably support the pedestals 1 and 1. Reference numeral 12 denotes an anti-slip pattern formed on the bottom surface of the grounding seat 10 (FIG. 3).
[0032]
The Te ladder A smell of configuration, the vicinity of the lower end of the pedestal 1 of the one side, to specifically right above position of the ground washer 10, the rolling wheel 3 and projecting toward the side of the ladder A The rolling wheel 3 is detachably attached via an attachment member 30.
[0033]
The rolling wheel 3 includes two ring main bodies 3a and 3a and the mounting member 30. The mounting member 30 includes two plate bodies 30 ′. That is, as shown in FIGS. 2 to 4, the connecting plate 31 is formed by connecting a substantially rectangular plate body 30 ′ (FIG. 2) composed of an extending portion 30 b extending obliquely downward from a substantially rectangular mounting base portion 30 a. 2 are connected to each other (see FIGS. 3 and 4). In addition, the space | interval of said plate body 30 'leaves the space | interval which pinches | interposes only the part for the width | variety in the front view of the pedestal 1. A wheel shaft 3d is mounted between the ends of the extending portion 30b, and two wheel bodies 3a and 3a are rotatably attached to the wheel shaft 3d. 3c is a spacer interposed between the ring main bodies 3a and 3a. In this reference example, the connecting plate 31 and both plate bodies 30 ′ are connected by welding, but the connecting means is not particularly limited.
[0034]
The attachment member 30 is attached from the side of the pedestal 1 so that the pedestal 1 of the ladder A is held between the attachment bases 30a, and is attached to the end of the attachment base 30a by two upper and lower attachment bolts 32, 32. In addition to being screwed, in this embodiment, the connecting plate 31, the side surface of the pedestal 1 and the end fitting mounting bracket 10a are screwed together by mounting bolts 33, and the ladder A is vertically fixed. In this state, the wheel body 3a is attached with a slight gap D from the bottom surface of the grounding seat 10 so as not to ground. The mounting bolt 33 is mainly intended to fix the end fitting mounting bracket 10a to the pedestal 1. The mounting member 30 is fixed only to the two mounting bolts 32, 32. It may be used exclusively for connecting the mounting bracket 10a.
[0035]
Thus, by attaching the rolling wheel 3 to the pedestal 1 in a state of projecting sideways in a front view, as shown in FIG. 5, if the ladder A is tilted so that the rolling wheel 3 is grounded, Even one worker M can easily move the ladder A to a desired place while keeping the posture. E is a ground plane. Moreover, since the rolling wheel 3 is detachable, it can be retrofitted to the existing ladder A, and can be easily removed when not needed.
[0037]
In addition, the pedestal 1 of the ladder A to which the rolling wheels 3 are attached is a concept including an outrigger (not shown) connected to the pedestal 1, for example.
[0038]
( Reference example)
Also in this reference example, the lifting / lowering apparatus with a step rail will be described as a ladder. In this case, the ladder may be not only a single ladder but also a plurality of ladder structures configured to be extendable and retractable in multiple stages.
[0039]
6 (a) is a side view of a ladder according to a reference example, FIG. 6 (b) a front view thereof, FIG. 7 is a part enlarged side view of the ladder, 8 a front view thereof, FIG. 9 is rolling wheel of FIG. 10 is an explanatory view showing another usage example of the ladder, and FIG. 11 is an explanatory view showing a usage state of the ladder.
[0040]
As shown in FIGS. 6 to 9, this reference example is different from the first embodiment in that the left and right pedestals 1 are in a state in which the rolling wheels 3 protrude in the front-rear direction in a front view of the ladder A. , 1 is attached to each.
[0041]
That is, the rolling wheel 3 according to the present reference example includes one wheel body 3 a and the mounting member 30 having the same configuration as described above, and the two wheels in the present embodiment constituting the mounting member 30. The interval between the plate bodies 30 ′ and 30 ′ is set to an interval that sandwiches the thickness of the pedestal 1 (see FIG. 9).
[0042]
The structure for attaching the rolling wheel 3 to the pedestal 1 is the same as that of the first embodiment described above and is also detachable, and detailed description thereof is omitted here.
[0043]
7 to 9, the mounting member 30 is mounted from the front (rear) of the pedestal 1 so as to hold the pedestal 1 of the ladder A between the mounting bases 30a, and the end side of the mounting base 30a. The upper and lower mounting bolts 32 and 32 are screwed together. Therefore, when using the ladder A according to the present reference example, as shown in FIG. 11, the rolling wheel 3 protrudes to the front side (rear side), but there is no protrusion in the width direction of the ladder A. There is no danger of getting in the way.
[0044]
As for the mounting bolts 33 used in the first embodiment, as shown in FIGS. 7 to 9, only the end fitting mounting bracket 10a is connected and fixed to the pedestal 1 in this reference example.
[0045]
Further, in this reference example, when the rolling wheel 3 is grounded, the bottom surface of the wheel main body 3a and the grounding seat 10 in a state where the ladder A is vertical so that the ladder A is sufficiently laid down. The distance D ′ is set to about twice the height of the grounding seat 10 (see FIG. 7). This is about 8 times the gap D in the first embodiment. The distance D ′ may be determined as appropriate so as to realize the inclined posture shown in FIG.
[0046]
Thus, in this reference example, the rolling wheels 3 are attached to the left and right pedestals 1 so as to protrude forward (rearward), and the ladder A is in a state in which the ladder A is sufficiently laid down when the rolling wheels 3 are grounded. By being inclined, the ladder A can be moved in a posture as shown in FIG. 10, and in this case, the ladder structure itself can be used as a carriage as shown in the drawing, and the work tool A necessary load F can be transported on the ladder A. In other words, the provision of the rolling wheels 3 makes it possible to facilitate the movement of the ladder A in addition to the general usage form of the ladder A, and allows the use of a new function as a carriage, which is convenient. Remarkably improved.
[0047]
( Example)
In the present embodiment, the lifting / lowering device with a step rail will be described as a ladder-supporting stepladder in which a pair of ladder structures are connected to each other so as to be freely opened and closed.
[0048]
FIG. 12 is a side view of the ladder and stepladder according to the present embodiment, FIG. 13 is a front view thereof, FIG. 14 is a side view of the ladder combination stepladder when the ladder structure is closed, and FIG. 16 is an enlarged front view of the main part, FIG. 17 is an explanatory view showing an example of a method of using the ladder and stepladder, FIG. 18 is an explanatory view of a first locking member of the ladder and stepladder, and FIG. FIG. 20 is a cross-sectional view taken along line II-II in FIG. 18, and FIG. 21 is an explanatory view of a second locking member of the ladder and stepladder.
[0049]
As shown in FIG. 12, the ladder combined stepladder (hereinafter referred to as “the stepladder B”) rotates a pair of ladder structures around the connecting shaft 5 via joint fittings 50, 50 between upper ends thereof. The two ladder structures are linearly opened (see the alternate long and short dash line) and can be used as a ladder. The basic structure of the ladder structure is the same as that of the first and second embodiments, but when the ladder structures are connected to each other, the connecting side end of each ladder structure is used as a scaffolding so as to become a scaffold. The surface is wider than 2, and a non-slip process 13 is applied to the surface. Unlike the previous embodiment, the grounding seat 10 'provided at the lower end of the pedestal 1 is a fixed type made of resin or rubber.
[0050]
And when using as stepladder B, the 1st locking member 6 is spanned between the pillars 1 and 1 of a ladder structure so that the connection attitude | position of ladder structures may not collapse. In the figure, reference numeral 7 denotes a second locking member, which, when used as a ladder, spans between the end portions where the ladder structures are attached to each other so that the posture of the ladder structure does not collapse. I am doing so. The first and second locking members 6 and 7 will be described in detail later. As shown in FIG. 14, the first locking member 6 is pivoted at one end to the pedestal 1 on one side. While freely connecting, the other end is freely engageable with a locking pin 16 projecting from the other pedestal 1, and when the stepladder B is folded, a superposed state is formed on the surface side of the one pedestal 1. Can be made. On the other hand, the second locking member 7 is configured to be foldable into a link shape. When the stepladder B is folded, the second locking member 7 is bent into a mountain shape.
[0051]
In the present embodiment, in the stepladder B having the above-described configuration, the rolling wheels 3 are respectively provided at the lower end positions of the left and right pedestals 1 in one ladder structure and at the center position of the step 2 that is separated from both positions by a certain distance. It is characterized in that one ladder structure provided with the rolling wheels 3 can be used as the carriage unit 4 when the ladder structures are attached and opened at about 90 °.
[0052]
That is, as shown in FIG. 12 to FIG. 14, the rolling wheels 3 are respectively placed at the lower end positions of the left and right pedestals 1 in one ladder structure and the central position of the step 2 that is separated from both positions by a certain distance. It is installed.
[0053]
As shown in FIGS. 15 and 16, the rolling wheel 3 attached to the position of the lower end portion of the pedestal 1 is attached to the distal end of an attachment member 30 whose base end is rotatably connected to the pedestal 1 via a connecting shaft 35. It is connected so that it can rotate freely, and can rotate from the retracted position where it overlaps with the pedestal 1 to the protruding position, with the connecting shaft 35 as the center. In the figure, 34 is an interposition member for rotatably attaching an attachment member 30 for supporting the rolling wheel 3 to the leg column 1, and is connected and fixed to the leg column 1 by an attachment bolt 32. As shown in FIG. 15, the rolling wheel 3 in the present embodiment can be fixed by the locking tool 8 at the retracted position and the protruding position.
[0054]
The locking tool 8 has a hook-shaped locking tool mounting body 80 attached to the side surface of the mounting member 30, and a shaft 81 projecting from the knob 82, and the coaxial body 81 is mounted on the locking tool mounting. It is penetrated through the body 80 and the attachment member 30 and is attached so as to be able to penetrate to the engagement hole 15 formed in the interposition member 34. Further, one end is engaged in the middle of the shaft body 81, and the other end is engaged with the engagement tool. A coil spring 83 brought into contact with the inner surface of the mounting body 80 is disposed so that the knob portion 82 can be moved back and forth in the axial direction. Then, the locking hole 15 is formed at two locations corresponding to the retracted position and the protruding position of the rolling wheel 3, so that it can be fixed at a predetermined position.
[0055]
On the other hand, in the present embodiment, the rolling wheel 3 attached to the center position of the traverse 2 is kept in a fixed state while maintaining a predetermined angle. However, like the rolling wheel 3 attached to the pedestal 1 described above, the rolling wheel 3 is rotatable. Also good.
[0056]
With this configuration, as shown in FIG. 17, when the ladder structures are opened at approximately 90 °, one ladder structure provided with the rolling wheels 3 can be used as the carriage unit 4. .
[0057]
That is, as described above, even the ladder A can be used as a carriage (see the second embodiment), but the ladder structures of the stepladder B are opened at about 90 ° as in this embodiment. In this state, one ladder structure is used as the carriage unit 4 while the other ladder structure can be used as a handwheel handle 4 'and three rolling wheels 3 are provided. It is possible to add a transport function that is comparable to a simple cart.
[0058]
In this case, the rolling wheels attached to the tram 2 can be caster wheels that can rotate freely, and can be conveyed while being steered.
[0059]
Moreover, in this case as well, the rolling wheels 3 can be removed if not necessary, or can be rotated and kept in a stored state so as not to get in the way.
[0060]
Here, the first and second connecting members 6 and 7 will be described.
[0061]
As shown in FIG. 18, the first connecting member 6 includes a sheath member 60 whose left and right side ends are folded inward and a slide member 61 slidably inserted into the sheath member 60. The engagement pins 61a provided on the slide member 61 can be locked in the engagement holes 60a and 60b provided near both ends. Reference numeral 60c denotes a pivot connecting portion with the limb 1 on one side.
[0062]
As shown in FIG. 19, the engaging pin 61a is disposed in the slide member 61 formed in a hollow shape, and is biased to the other end of the U-shaped leaf spring 61b having one end fixed. It is connected.
[0063]
Further, an engaging portion 62 that can be engaged with the pedestal 1 is provided at the distal end portion of the slide member 61. The engaging portion 62 protrudes from the other pedestal 1 as shown in FIG. The intermediate plate 63 is formed with a pin insertion hole 63a through which the engaging pin 16 is inserted, and a buckle portion 64 is slid in a state in which the intermediate plate 63 is inserted. A bay-shaped recess 64a is formed which engages with the head 16a of the coupling pin 16 to prevent it from coming off. The buckle portion 64 is bent in a crank shape, and a base end of a leaf spring 65 in which a locking bent portion 65a is formed at the front end and an engaging convex portion 65b is formed in the middle is connected and fixed. Movement amount restricting holes 63b and 63c are formed which engage with the bent portion 65a and the engaging convex portion 65b to restrict the amount of movement.
[0064]
With this configuration, the buckle portion 64 is slid toward the end of the intermediate plate 63 in the state where the pin insertion hole 63a is inserted into the engagement pin 16 of the pedestal 1 as shown in FIG. By engaging the recess 64a with the engaging pin 16, the first connecting member 6 is prevented from coming off in the use state of the stepladder B as shown in FIG. 12, and the stepladder B can be used safely. Yes (see FIG. 12). Also, as shown in FIG. 20B, the first connecting member 6 can be detached from the other pedestal 1 by sliding the buckle portion 64 in the opposite direction (see FIG. 14).
[0065]
On the other hand, the 2nd connection member 7 becomes a structure of a half-broken link type | mold, and functions as an opening stopper at the time of making a ladder structure linear.
[0066]
The second connecting member 7 includes a first link 71 having a base end rotatably attached to the pedestal 1, and a second link 72 connected to the first link 71 by a link node 70. An engaging portion 74 is provided at the tip of the link 72.
[0067]
The engaging portion 74 is detachably engageable with the pin 17 projecting from the pedestal 1. The base member 74a is formed with a notch hole 75 through which the pin 17 can be inserted from the horizontal direction, and a spring (not shown). ), And a stopper member 78 having a pin insertion hole 77 in which the dish-like head of the pin 17 can be inserted vertically. At the position above the pin 17, there is provided a pin 18 for preventing the opening for engaging the second connecting member 7 when the ladder structure is linear.
[0068]
By the way, in the ladder structure of the stepladder B according to the present embodiment, at least the left and right legs and rolling wheels 3 and 3 can be provided at the lower end of any one of the pillars 1 and 1, and an open leg state used as the stepladder B. Even so, it can be moved while being rolled as easily as the ladder A described in the first and second embodiments, and the movement can be facilitated.
[0069]
As mentioned above, although this invention was demonstrated through each Example, this invention is not limited to the structure of each Example.
[0070]
【The invention's effect】
The present invention is implemented in the form as described above, and has the following effects.
[0071]
(1) In the present invention, the ladder structure attached to multistage踏桟between a pair of the pillar, a Stepping - With Centering Flange lifting device provided with a rolling wheel for conveying auxiliary, at least one of said legs Since the rolling wheels are detachably attached to the lower end of the pillar via the attachment members toward the side of the ladder structure , when the ladder or stepladder is moved , the rolling wheels are not held. The moving wheel can be moved while being pushed and pulled while being grounded, and even a large and heavy one can be easily moved and transported by one person. In addition, rolling wheels can be retrofitted to existing ladders or stepladders, and can be easily removed if unnecessary.
[0074]
( 1 ) In the present invention, a pair of ladder structures are connected to each other so as to be openable and closable to form a ladder-supporting stepladder, a required number of rolling wheels are attached to one ladder structure, and the ladder structures are connected to each other. A lifting / lowering device with a traverse that allows one ladder structure provided with rolling wheels to be used as a trolley when opened at approximately 90 °, wherein the rolling wheels are connected to the left and right sides of one ladder structure, respectively. At the lower end position of the pedestal and at the center position of the step pedestal spaced apart from both positions, it can be fixed by a locking tool at the retracted position and the protruding position, respectively, and the roller attached at the center position of the step pedestal is attached. The driving wheel is a caster wheel that can rotate freely.
Therefore , one ladder structure can be used as a cart, while the other ladder structure can be used as a handwheel (hand-drawing) handle, and a transport function comparable to a full-fledged cart can be added.
In addition, it is possible to use it as a sufficiently stable cart while suppressing the cost increase with the minimum number of rolling wheels, and further, the rolling wheels mounted at the center position of the tram are caster wheels that can rotate freely. It is possible to convey while steering.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a ladder according to a reference example.
FIG. 2 is an enlarged front view of a main part of the ladder.
FIG. 3 is a side view of the same.
FIG. 4 is an explanatory view showing a state in which the rolling wheels are attached to the pedestal.
FIG. 5 is an explanatory view showing a conveying state of the ladder.
FIG. 6 is an explanatory diagram of a ladder according to a reference example.
FIG. 7 is an enlarged side view of a main part of the ladder.
FIG. 8 is a front view of the same.
FIG. 9 is an explanatory view showing a state where the rolling wheels are attached to the pedestal.
FIG. 10 is an explanatory view showing another example of use of the ladder.
FIG. 11 is an explanatory diagram showing a usage state of the ladder.
FIG. 12 is a side view of the ladder and stepladder according to the first embodiment.
FIG. 13 is a front view of the same.
FIG. 14 is a side view when the ladder structure in the ladder and stepladder is closed.
FIG. 15 is an enlarged side view of the main part.
FIG. 16 is an enlarged front view of the main part.
FIG. 17 is an explanatory view showing an example of a method of using the ladder-ladder stepladder.
FIG. 18 is an explanatory view of a first locking member of a ladder / ladder.
19 is an explanatory diagram viewed from a cross-section taken along line II of FIG.
20 is a cross-sectional view taken along line II-II in FIG.
FIG. 21 is an explanatory view of a second locking member of the ladder and stepladder.
[Explanation of symbols]
A Ladder B Stepladder 1 Pedestal 2 Treadle 3 Rolling wheel

Claims (1)

When a pair of ladder structures are connected to each other so as to be openable and closable to form a ladder-supporting stepladder, a required number of rolling wheels are attached to one ladder structure, and the ladder structures are opened at approximately 90 ° In addition, it is an elevating and lowering device with a step rail that can use one ladder structure provided with rolling wheels as a carriage part,
The rolling wheels can be fixed to the left and right pedestal lower end positions in one ladder structure and the center position of the stepped pedestal spaced apart from both positions by a locking tool at a retracted position and a protruding position, respectively. An elevating / lowering implement with a treadle, wherein the rolling wheel attached at the center position of the treadle is a caster wheel that can rotate freely .

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