KR101437264B1 - Movable cleaner for outer wall of building - Google Patents

Abstract

The present invention relates to a movable building exterior wall cleaner, and more particularly, to a movable building exterior wall cleaner, which comprises a cart, a pedestal provided on an upper portion of the cart, both ends of which extend from the cart, A sliding member vertically installed on the sliding member, a horizontal bar horizontally installed on the upper end of the frame, and a pair of supporting members, And a cleaning device mounted on a front end of the horizontal bar to clean the outer wall of the low-rise building and the high-rise building simply and cleanly.

Description

{MOVABLE CLEANER FOR OUTER WALL OF BUILDING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable building exterior wall cleaner, and more particularly, to a movable building exterior wall cleaner capable of cleaning not only a low-rise building but also an outer wall of a high-rise building.

Recently, with the improvement of the quality of life, interest in the environment has increased, and various maintenance projects are being actively carried out to improve the city and residential environment nationwide. In particular, the exterior wall of a building is the first part to be visually recognized in everyday life, and thus it is a major object of the environmental maintenance project.

Conventional building exterior walls were cleaned by high-rise buildings such as high-rise ladder or tightrope, and in the case of low-rise buildings, workers climbed up the ladder directly to broom or spray water.

However, if the outer wall is cleaned by a ladder or a tightrope in a high-rise building, it is very dangerous for safety because it requires manual work by a worker. On the other hand, even in the case of a low-rise building, a worker has to go up to the outer wall of the building to clean it. Therefore, there is always a risk of falling, and there is a limit to the height at which cleaning is possible. In addition, in any case, when the water is used in the cleaning process, a large amount of sewage is splashed around, causing inconveniences to the passengers and the vehicle, thereby causing various civil complaints to occur.

Various types of building cleaners have been developed, such as the registered utility models 20-0265415 and 10-0220142, but most of them can be used only in high-rise buildings. In addition to being difficult to use in middle-low-rise buildings, It is difficult to commercialize it because it is very complicated and expensive to manufacture.

Particularly, since most conventional exterior wall cleaners are very bulky, it is often impossible to use them in a dense building area. Therefore, even though the front of a building with a space margin can be cleaned, it is often difficult to clean the side or the rear surface due to the adjacent building due to the adjacent building. Further, in the conventional building exterior wall cleaners adopting the height adjustment method of the existing ladder car or the high-altitude work car, parts for height adjustment such as hydraulic cylinder, wire, belt, roller, pulley and the like are often exposed to the outside There is also a problem in that it is difficult to compact and the risk of safety accidents due to fragmentation when parts are broken.

The present invention has been devised to solve the problems of the prior art described above, and it is an object of the present invention to provide a movable building exterior wall cleaner that can be easily and safely cleaned without inconveniencing a passenger or a vehicle from a low- There is a purpose.

Another object of the present invention is to provide a movable building exterior wall cleaner which is relatively simple in construction, has excellent durability, and is low in manufacturing cost and can be practically commercialized.

It is still another object of the present invention to provide a movable building exterior wall cleaner which can minimize the volume of parts used for height adjustment and prevent safety accidents.

As means for solving the above-mentioned technical problem,

The present invention relates to a cart comprising: a cart; A pedestal installed at an upper portion of the cart and having both ends extended from the cart, and a guide rail formed at an upper portion of the cart; A pair of supports respectively coupled to both lower ends of the pedestal; A sliding member movably coupled to the guide rail of the pedestal; A frame vertically installed on the sliding member; A horizontal bar horizontally installed at the top of the frame; And a cleaning device mounted on a front end of the horizontal bar.

In this case, the support base may include a first support member hingedly coupled to the lower ends of the pedestal so as to be rotatable in a horizontal direction, a second support member extending downward from an end of the first support member, And a pedestal installed at a lower end of the pedestal so as to be adjustable in height by a hydraulic cylinder or a screw connection.

In this case, the frame may include a first frame member vertically installed on the sliding member, at least one second frame member inserted into the first frame member so as to overlap with the inner side of the first frame member, And the second frame member and the third frame member can be slid up and down by the lifting means.

In this case, the elevating means includes a first pulley installed at an inner lower end of the first frame member; A second pulley and a third pulley installed at the inner upper and lower ends of the second frame member, respectively; A fourth pulley installed at the inner upper end of the third frame member; One end fixed to the first frame member and the other end positioned inside the third frame member; And a wire drum connected to the other end of the wire to wind the wire, wherein the wire is sequentially wound on the first pulley, the second pulley, the third pulley, and the fourth pulley, One end of the first pulley and the other end of the third pulley are spaced apart from the first frame member and the second frame member, respectively, with the lower ends of the second frame member and the third frame member being spaced upward from the first frame member and the second frame member, And the first pulley and the second pulley.

In this case, a stopping protrusion is formed on the upper ends of the first frame member and the second frame member, and a stopper protrudes from the outer lower ends of the second frame member and the third frame member, When the third frame member is lifted, the stopper is hooked on the hooking jaw so that the second frame member and the third frame member are sequentially raised.

In this case, the movable building exterior wall cleaner may include a first plate installed at an upper end of the second frame member; A second plate installed at a lower end of the first frame member; A plurality of flow preventive wires having one end fixed to the first plate and the other end connected to the second plate; And a wire roll on which the other end of the flow preventive wire is wound, wherein the wire roll rotates in a state that the tension of the flow preventive wire is maintained when the second frame member and the third frame member are lifted, It can rotate at the same speed as the drum's winding speed.

In this case, the horizontal bar is composed of a plurality of arm members, and the plurality of arm members are overlapped with each other and can be moved in the forward and backward direction by the ball screws.

In this case, the cleaning device may include a plate-like body coupled to the front end of the horizontal bar, a heater installed on the body to spray steam, a washing water spray nozzle installed on the body for spraying the washing water, A sponge rotatably installed below the brush, and a dewatering rod having a cam shape on one side of the sponge, the dewatering rod having a cam shape, And the sponge is pressed by the rotation of the dewatering rod so that dewatering can be performed.

In this case, a plurality of wheels may protrude from the front edge of the body.

According to the present invention, since the volume of the vacuum cleaner is minimized, the outer wall and the signboard of the building can be easily cleaned even in a narrow space, and the waste water generated by the cleaning process is absorbed by the sponge, Civil complaints can be prevented beforehand.

It also minimizes the volume by installing the wires and pulleys used for lifting and lowering the frame inside the frame by superimposing the frame for height adjustment in the inner direction and preventing safety accidents caused by cut or break of the wire and pulley .

1 is a perspective view of a movable building exterior wall cleaner according to a preferred embodiment of the present invention,
2 is a perspective view showing a state in which a support of a movable building exterior wall cleaner is unfolded according to a preferred embodiment of the present invention,
3 is a perspective view illustrating a frame member of a movable building exterior wall cleaner according to a preferred embodiment of the present invention,
4 is a perspective view illustrating a coupling structure of a frame member of a movable building exterior wall cleaner according to a preferred embodiment of the present invention,
Fig. 5 is a plan view of Fig. 4,
Fig. 6 is a structural view showing a state in which the frame members of Fig. 4 are unfolded;
Fig. 7 is a principal perspective view showing a frame and a horizontal bar of Fig. 1,
8 is an enlarged view of a cleaning device of a movable building exterior wall cleaner according to a preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention, parts not related to the description are omitted, and similar parts are denoted by similar reference numerals throughout the specification.

FIG. 1 is a perspective view of a movable building exterior wall cleaner according to a preferred embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which a support stand of a movable building exterior wall cleaner according to a preferred embodiment of the present invention is unfolded.

1 and 2, a movable building exterior wall cleaner 100 according to a preferred embodiment of the present invention includes a cart 110, a pedestal 120, a support 130, a sliding member 140, A frame 150, a horizontal bar 170 and a cleaning device 180.

The cart 110 is for movement, and an appropriate number of wheels 111 are provided at the bottom. The shape of the cart 110 is not particularly limited, but it is preferable that the cart 110 has a rectangular parallelepiped shape so that it can be easily moved even in a narrow space. Meanwhile, a pump or a high-pressure injector for supplying water and detergent to the cleaning device 180 may be accommodated in the water tank, the detergent container, the water container, and the detergent container, have.

The pedestal 120 is for horizontally moving the sliding member 140 and is installed on the top of the cart 110. In this case, a guide rail 121 for guiding the horizontal movement of the sliding member 140 is formed in a U-shape inside the upper portion of the pedestal 120. Both ends of the pedestal 120 extend in the longitudinal direction so as to protrude from the cart 110. The extension length of both ends of the pedestal 120 can be appropriately adjusted in consideration of the moving distance of the frame 150 by the sliding member 140. However, the support base 130 may be rotated inward to be completely folded There should be a degree.

The supporter 130 is for supporting a load applied to the pedestal 120, and four pedestals 120 are coupled to the pedestal 120 at two ends thereof. Specifically, the support base 130 includes a first support member 131 hingedly coupled to the lower ends of the pedestal 120 so as to be rotatable in the horizontal direction, and a second support member 131 extending downward from the end of the first support member 131 And a support plate 133 coupled to a lower end of the second support member 132. The second support member 132 may be formed of a metal plate. In this case, the support plate 133 is screwed to the lower end of the second support member 132 so that the height of the support plate 133 is adjusted through rotation. However, the height of the support plate 133 is not limited thereto, It is of course possible to adjust the height by using it. Therefore, if the height of the support plate 133 is adjusted for each support member, the support 120 can be kept horizontal even when the ground is not flat and irregular.

Meanwhile, as shown in FIG. 2, when the support 130 is unfolded, the support 130 may be pushed to the left or to the right depending on the vibration or the surrounding environment. In this case, a groove is formed in the first support member 131, a hole is formed in the bracket 134 to which the first support member 131 is coupled, and a pin is inserted into the groove through the hole It is possible to prevent a gap phenomenon of the supporter 130 by fixing it with a rear stopper.

The sliding member 140 moves the frame 150 in the horizontal direction and is coupled to the guide rail 121 of the pedestal 120. The movement of the sliding member 140 may be performed by a plurality of wheels mounted on both sides of the sliding member 140 and installed between the guide rails 121. Here, it is also possible to replace the wheel with a gear. In this case, teeth are formed on the pedestal 120 to engage with the gear. Meanwhile, the sliding member 140 may be manually moved, or may be automatically moved by engaging the motor with the wheel or the gear.

Subsequently, the frame 150 is vertically installed on the sliding member 140 to adjust the height of the cleaning device 180. Hereinafter, the frame 150 will be described in more detail with reference to the drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum cleaner, and more particularly, 5 is a plan view of Fig. 4, Fig. 6 is a structural view showing a state in which the frame members of Fig. 4 are unfolded, and Fig. 7 is a main part perspective view showing a frame and a horizontal bar of Fig.

3 to 7, the frame 150 includes a rotatable first frame member 151 vertically installed on the sliding member 140, a first frame member 151 rotatably mounted on the first frame member 151, And a third frame member 153 inserted into the second frame member 152 and having an upper end coupled to the horizontal bar 170. The second frame member 152 is inserted into the second frame member 152, do.

Here, the second frame member 152 means at least one intermediate member disposed between the first frame member 151 disposed on the outermost side and the third frame member 153 disposed on the innermost side And a plurality of frame members sequentially inserted in the inward direction to increase the rising height of the cleaning device 180.

As shown in FIG. 3, each frame member has a cross-sectional structure of a C-shaped cross section with one side open, a latching protrusion 154 is formed at an upper end thereof, and a stopper 155 is formed at an outer side of a lower end thereof, The stopper of the frame member is caught by the latching jaw of the outer frame member. In this case, rollers 156 are provided on the outer side of each frame member at an appropriate number, and can smoothly slide while minimizing the friction with the adjacent frame members.

Meanwhile, each frame member constructed as described above is installed with a structure in which the inner end of the outer frame member is partially exposed to the inner frame member as the lower end length becomes shorter toward the inner side as shown in FIG. In this state, the height of the frame 150 is adjusted up and down by the elevating means.

4 to 6, a first pulley 157 is provided at an inner lower end of the first frame member 151 and a second pulley 157 is provided at an inner upper end and a lower end of the second frame member 152, And a fourth pulley 160 is installed on an inner upper end of the third frame member 153. The third pulley 159 is mounted on the inner side of the third frame member 153, Here, when there are a plurality of the second frame members 152, pulleys are installed in the upper and lower inner side of each frame member in the same manner.

Meanwhile, in the present invention, the first pulley 157 and the third pulley 159, that is, the pulley positioned at the lower end are inclined inward. 5, one end of the first pulley 157 and one end of the third pulley 159 are inclined toward the inner frame member and are connected to the second pulley 158 and the fourth pulley 159, respectively, 160, so that the other end of the third pulley 159 is positioned vertically below the other end of the second pulley 158.

In the above-described state, the wires 161 are sequentially wound on the respective pulleys as shown in Fig. That is, in the present invention, since the lower end portion of the outer frame member is partially exposed to the inner frame member as described above, the lower pulley can be inclined so that the wires can be sequentially connected to the respective frame members. With this configuration, since both the wire and the pulley are disposed inside the frame member, the volume of the frame member can be minimized to enable smooth operation even in a narrow space, and the risk of safety accidents due to component breakage can be prevented.

In this case, one end portion 161a of the wire 161, that is, the portion wound around the first pulley 157 is fixed to the first frame member 151, and the other end portion of the wire 161 161b, that is, a portion wound on the fourth pulley 160 is connected to a wire drum (not shown). Therefore, when the wire drum is operated to wind the wire 161, the second frame member 152 is first raised and the stopper 155 of the second frame member 152 is moved to the first frame member 151 The third frame member 153 is lifted up when the second frame member 152 is further raised. The elevation height of the third frame member 153 is limited by the stopper and the engagement protrusion as in the case of the second frame member 152. After the cleaning operation is completed, the wire drum is operated to move the wire 161 in the opposite direction The third frame member 153 and the second frame member 152 descend in order.

On the other hand, when the frame 150 is elevated to its maximum, the length thereof becomes very long, so that it can be easily shaken by wind or vibration. Therefore, in the present invention, the frame 150 may further include a flow prevention device to prevent the frame 150 from shaking.

7, the flow prevention device includes a first plate 162 fixed to the upper end of the second frame member 152 and a second plate 162 fixed to the lower end of the first frame member 151 A second plate 163 and a plurality of flow prevention wires 164 and one or more flow prevention wires 164 which are fixed at one end to the first plate 162 and at the other end to the second plate 163, And a wire roll (not shown) to which the other ends of the wire rolls are connected.

The shape of the first plate 162 and the second plate 163 is not particularly limited, but is formed in a rectangular plate shape so that the tension of the flow prevention wire 164 can act uniformly, 164 are respectively coupled. In this case, the wire roll is controlled to rotate at the same speed as the wire drum described above. That is, by rotating the wire roll in accordance with the winding speed of the wire drum, the flow prevention wire 164 is loosened while maintaining the tension. For this purpose, it is preferable that the rotation axis of the wire roll and the wire drum have the same diameter, but if the diameter of the rotation axis is different, the rolling length of the wire can be controlled by adjusting the winding speed.

In this embodiment of the present invention, the tension of the flow prevention wire 164 is not adjusted in a state where the frame 150 is maximally raised, but the tension of the flow prevention wire 164 is maintained at a maximum, It is possible to further minimize the risk of the flow phenomenon due to the external environment and thus the overturning due to the external environment.

The horizontal bar 170 is provided horizontally on the upper end of the frame 150, more specifically, on the upper end of the third frame member 153 for approaching the outer wall of the building. 7, the horizontal bar 170 includes a first arm member 171 horizontally fixed to the upper end of the third frame member 153, A third arm member 173 slidably installed on the inner side of the second arm member 172 and having a front end coupled to the cleaning device 180, As shown in FIG. In this case, although not shown in the figure, a spring may be installed between the third arm member 173 and the cleaning device 180, and when the outer surface of the building has irregularities, ) To the outer wall of the building to maximize the cleaning effect.

Here, the second arm member 172 and the third arm member 173 may be moved in the forward and backward direction by ball screws installed on the inner side. That is, screws are provided along the longitudinal direction inside the arm members 171, 172, 173, at least one bracket moving in the forward and backward directions is coupled to the screw using a ball, The second arm member 172 and the third arm member 173 can be moved back and forth when the arm member 172 and the rear end of the third arm member 173 are fixed, respectively.

Since the first arm member 171 is configured to support the other arm members 172 and 173 and the cleaning device 180 installed in front of the first arm member 171, the first arm member 171 must be firmly fixed to the third frame member 153 do. Therefore, it is preferable that a bracket-like fixing piece 174 is fastened to the connection portion between the first arm member 171 and the third frame member 153. With this configuration, it is possible to prevent the first arm member 171 from being bent downward by the fixing piece 174. The weights 175 are mounted on the rear end of the first arm member 171 and the rollers 176 are mounted on the center of gravity of the first arm member 171. The front end and the rear end of the first arm member 171 are connected to the rollers 176 The wire 177 can be stably held horizontally.

8 is an enlarged view of a cleaning device of a movable building exterior wall cleaner according to a preferred embodiment of the present invention.

Finally, the cleaning device 180 is mounted on the front end of the third arm member 173 for directly cleaning the outer wall of the building. 8, the cleaning device 180 includes a plate-like body 181 rotatably coupled to the front end of the third arm member 173 so as to be vertically and horizontally rotatable, A cleaning water injection nozzle 183 installed at the bottom of the heater 182 for spraying the washing water and a heater 182 installed at the bottom of the washing water spraying nozzle 183, A detergent spray nozzle 184 for spraying the detergent and a brush 185 rotatably installed under the detergent spray nozzle 184.

In this case, the heater 182, the cleansing water spray nozzle 183, the detergent spray nozzle 184, and the brush 185 may be installed to expose certain parts of the body 181, The cleansing water spraying nozzle 183 and the detergent spraying nozzle 184 are connected to the pump or the high-pressure spraying device described above by a hose. The brush 185 may be fabric or plastic material, but it may be replaced with an iron material when cleaning the marble wall surface. For reference, if the marble wall surface is washed with a steel brush, marble polishing powder may be generated. In this case, it is preferable to install a dust collector. On the other hand, a wheel 188 is installed on the front edge of the body 181 in an appropriate number. When the wheel 188 is installed as described above, the cleaning device 180 can be moved up and down in a state in which the cleaning device 180 is in close contact with the outer wall of the building.

In the present invention, a sponge 186 and a dewatering rod 187 are provided below the brush 185. The sponge 186 is rotatably installed at a lower portion of the brush 185 to absorb the wastewater generated during the cleaning process, thereby preventing the wastewater from splashing out. Meanwhile, the dewatering rod 187 is provided adjacent to the sponge 186 to dewater the wastewater absorbed by the sponge 186. In this case, the dewatering rod 187 has a cam-shaped cross-sectional structure, and the sponge 186 is pressed by rotation to dehydrate the sponge 186.

A light 189 for night work and a camera 190 for photographing the state of the wall of the building or a work process may be installed on the upper part of the body 181, An image is received through a display 191 installed in the pedestal 120 and provided to an operator.

The configuration of the present invention has been described above. Hereinafter, the operation of the present invention will be described.

First, the mobile building exterior wall cleaner 100 loaded on the vehicle is moved down to the work position. Thereafter, the support base 130 is unfolded, the height of the base 133 is adjusted, and the base is tightly fixed to the ground, and then fixed with pins and a stopper. Thereafter, the sliding member 140 is moved to the left and right to be positioned on the outer wall of the building to be cleaned, and the height of the frame 150 is adjusted by driving the wire drum to wind the wire 161. In this case, the wire roll is operated simultaneously with the operation of the wire drum to release the flow preventing wire 164 at the same speed as the winding speed of the wire 161. When the height of the frame 150 is adjusted, the horizontal bar 170 is moved forward to bring the cleaning device 180 into close contact with the outer wall of the building. Subsequently, the frame 150 is lowered or moved to the left and right to perform a cleaning operation. The cleaning operation is performed by using the heater 182 of the cleaning device 180, and a foreign substance stuck to the target wall surface is called. At the same time, the brush 185 is rotated while spraying the detergent dissolved in hot water, After cleaning thoroughly, clean wash water is sprayed to remove sewage. In this case, since the wastewater is absorbed by the sponge 186 and is dehydrated by the dewatering rod 187 after completion of the operation, there is no fear of splashing to the outside. Finally, when the series of operations is completed, the above-described processes are performed in reverse order and withdrawn.

The preferred embodiments of the present invention have been described in detail with reference to the drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Therefore, the scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning, range, and equivalence of the claims are included in the scope of the present invention. .

100: Movable building exterior wall cleaner 110: Cart
111: wheel 120: pedestal
121: guide rail 130:
131: first support member 132: second support member
133: Support plate 134: Bracket
140: sliding member 150: frame
151: first frame member 152: second frame member
153: third frame member 154:
155: stopper 156: roller
157: first pulley 158: second pulley
159: Third pulley 160: Fourth pulley
161: wire 162: first plate
163: second plate 164: flow prevention wire
170: horizontal bar 171: first arm member
172: second arm member 173: third arm member
174: Fixing piece 175: Weight weight
176: roller 177: wire
180: Cleaning device 181: Body
182: Heater 183: Cleaning water injection nozzle
184: Detergent spray nozzle 185: Brush
186: Sponge 187: Dewatering rod
188: Wheel 189: Light
190: camera 191: display

Claims (9)

A cart; A pedestal installed at an upper portion of the cart and having both ends extended from the cart, and a guide rail formed at an upper portion of the cart; A pair of supports respectively coupled to both lower ends of the pedestal; A sliding member movably coupled to the guide rail of the pedestal; A frame vertically installed on the sliding member; A horizontal bar horizontally installed at the top of the frame; And a cleaning device mounted on a front end of the horizontal bar,
The washing apparatus includes a plate body coupled to a front end of the horizontal bar, a heater installed in the body to spray steam, a washing water spray nozzle installed in the body to spray washing water, A sponge is rotatably installed below the brush, and a dewatering rod having a cam shape is installed on one side of the sponge, and the dewatering rod is installed on the side of the sponge, And the sponge is pressed by the rotation of the dewatering rod to perform dewatering. The method according to claim 1,
The support base includes a first support member hingedly coupled to the lower end of the pedestal so as to be rotatable in a horizontal direction, a second support member extending downward from the end of the first support member, and a second support member extending downward from the end of the first support member, And a support plate installed to be adjustable in height by a hydraulic cylinder or a screw connection. The method according to claim 1,
Wherein the frame includes a first frame member vertically installed on the sliding member, at least one second frame member inserted into the first frame member so as to overlap with the first frame member, and a second frame member inserted into the innermost portion of the second frame member And a third frame member coupled to the horizontal bar, wherein the second frame member and the third frame member are slid up and down by elevating means. The method of claim 3,
The elevating means includes:
A first pulley installed at an inner lower end of the first frame member;
A second pulley and a third pulley installed at the inner upper and lower ends of the second frame member, respectively;
A fourth pulley installed at the inner upper end of the third frame member;
One end fixed to the first frame member and the other end positioned inside the third frame member; And
And a wire drum connected to the other end of the wire to wind the wire,
The lower ends of the second frame member and the third frame member are connected to the first frame member and the second frame member so that the wire can be sequentially wound on the first pulley, the second pulley, the third pulley, Wherein one end of the first pulley and the third pulley are inclined so as to be vertically positioned below the second pulley and the fourth pulley in a state of being spaced upward relative to the second frame member. . 5. The method of claim 4,
Wherein a stopper is formed at an upper end of the first frame member and the second frame member and a stopper is protruded at an outer lower end of the second frame member and the third frame member, And the second frame member and the third frame member are sequentially raised when the stopper is hooked on the hooking jaw when the member is lifted. 5. The method of claim 4,
The movable building exterior wall cleaner includes:
A first plate installed at an upper end of the second frame member;
A second plate installed at a lower end of the first frame member;
A plurality of flow preventive wires having one end fixed to the first plate and the other end connected to the second plate; And
And a wire roll on which the other end of the flow preventing wire is wound,
Wherein the wire roll rotates at the same speed as the winding speed of the wire drum while maintaining the tension of the flow preventing wire when the second frame member and the third frame member are lifted. The method according to claim 1,
Wherein the horizontal bar is formed of a plurality of arm members, and the plurality of arm members are overlapped with each other and moved in the forward and backward direction by the ball screws. delete The method according to claim 1,
Wherein a plurality of wheels protrude from a front edge of the body.

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