JP2021055505A - Portable stepladder - Google Patents

Abstract

To facilitate lateral movement with a stepladder opened and to prevent the danger of unnecessary moving due to wheels for movement when used as a stepladder, in order to easily perform a large number of high place works while continuously moving laterally.SOLUTION: A portable stepladder is provided with a stepladder body A that is configured so that a degree of opening can be regulated and closing operation can be performed by connecting two sets of ladder frames 3a and 3b consisting of two side legs 1 and 1 and three treads 2, 2 and 2 arranged between them, at the uppermost parts of them via a rotary connecting part 4 so as to be opened and closed freely, and arranging a regulating part 5 between both treads 2 and 2 located in a middle of a vertical direction of both ladder frames 3a and 3b, and wheels 6 and 6 for movement are fitted to the side bottoms of the side legs 1 and 1 on the same side of both ladder frames 3a and 3b of the stepladder body A so as to be movable with the stepladder body A tilted toward the side legs 1 and 1 side.SELECTED DRAWING: Figure 1

Description

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to move between work places, which is used for construction work such as ceiling and wall surface of a building, installation and removal work of electric equipment on a wall surface, and high-altitude work such as electrical wiring work to a building. It is also about a portable stepladder.

This type of portable stepladder combines two sets of ladder frames consisting of two side legs and one or more cross rails arranged between them so that they can be opened and closed at the top, and at the lower end of one or both ladder frames. It is known that wheels are arranged on the outer surface side. The wheels are arranged so that the stepladder can be moved in a direction perpendicular to the inner and outer surfaces of the ladder frame.

The stepladder cart of Patent Document 1 is a kind of the above-mentioned portable stepladder, and the upper end of the rear leg (support frame) which is a short ladder frame is openably and closably connected to the upper part of the front leg which is a long ladder frame. Two wheels are attached to the outer surface side of the lower end of the hind legs so that they can move in a direction orthogonal to the outer surface. On the front leg, which is a ladder frame, an upper step stool and a front leg step stool, which are cross rails, are arranged. On the rear legs, which are the ladder frames, connecting rods (horizontal rails) that connect the side legs on both sides while holding them at predetermined intervals are arranged.

The stepladder cart of Patent Document 1 can be used not only as a general stepladder, but also as a rear car or cart, and also as a tripod by providing a pan head female screw on the upper part of the front leg. As shown in FIG. 7 of Patent Document 1, if the stepladder cart is tilted diagonally so that the rear leg side is facing down and the upper part of the front leg is grasped, the stepladder cart is in this state. , The wheels make it possible to move in the front-rear direction. Further, as shown in FIG. 8 of Patent Document 1, after closing the front leg and the rear leg of the stepladder cart, tilt it diagonally so that the rear leg side faces down, and grasp the upper part of the front leg in the same manner. If so, also in this case, the wheels can be moved in the front-rear direction.

As described above, the stepladder cart of Patent Document 1 has wheels only when it is tilted diagonally so that the rear leg side is facing down, that is, when it is used as a rear car or cart for movement. Since it is arranged so as to be in contact with the floor surface, when it is used as a stepladder or a tripod, it does not come into contact with the floor surface and can be used safely without fear of moving delusionally. However, as described above, in the stepladder cart of Patent Document 1, it is impossible to move laterally due to the relationship with the arrangement and orientation of the wheels. For example, it is decided to install some kind of equipment on the wall surface. It must be said that it is inconvenient to perform work while repeating lateral movement, such as repeating at intervals or irregular intervals. And there is a great deal of work that repeats the lateral movement in this way.

The portable workbench of Patent Document 2 is also a kind of the portable stepladder, and basically a pair of ladder frames that are openably and closably connected at the upper part and a tread plate that is foldably bridged in the middle of the upper part between the ladder frames. It is composed of a unit and wheels arranged on one outer surface side lower portion and the other inner surface side lower portion of the pair of ladder frames.

Each of the pair of ladder frames is composed of a pair of support legs, which are side legs, a plurality of treads arranged at appropriate intervals between them, and a handrail support extending from the upper end of the pair of support frames. Specifically, the pair of ladder frames are formed by connecting the upper ends of the handrail columns to each other so as to be openable and closable via a rotating metal fitting. Further, both ladder frames can be rotated outward in the middle of the vertical direction and can be folded as shown in FIG. 3 of Patent Document 2. Among the wheels, the wheels arranged at the lower part on the inner surface side of the ladder frame are located on the outer surface side in the folded state as shown in the figure, and the wheel side is downward as shown in the figure. If the ladder frame is tilted diagonally, it can be easily moved by using the wheels.

The portable workbench of Patent Document 2 can be used as a stepladder if a pair of ladder frames are opened to each other, and when used as a stepladder, none of the wheels come into contact with the floor surface. Therefore, it does not move unnecessarily and is safe. If it is necessary to move the portable workbench, the portable workbench can be easily moved by using the wheels by tilting the portable workbench diagonally to the side with the wheels in the open state. When folded as described above, it can be moved as described above.

However, as described above, in the portable workbench of Patent Document 2, as in the case of the stepladder cart of Patent Document 1, it is impossible to move laterally due to the relationship with the direction and arrangement of the wheels. It must be said that it is inconvenient to perform the above-mentioned work while repeatedly moving to the side.

The foldable stepladder of Patent Document 3 is also a kind of the portable stepladder, and consists of parallel first support pillars and second support pillars, which are side legs, and a stepladder which is a horizontal rail arranged between them. The main body (ladder frame), an auxiliary body (ladder frame) consisting of two columns (side legs) rotatably connected to the upper part in the middle of the upper part of the main body, and the first support column and the first support column of the main body. (Ii) It is composed of wheels arranged sideways (parallel to the surface formed by the first support pillar and the second support pillar) on the outside near the lower end of the support pillar. As shown in FIG. 1 of Patent Document 3, the wheels do not touch the ground when the main body and the auxiliary body are opened, and therefore the foldable stepladder does not move unnecessarily. .. On the other hand, as shown in FIGS. 3 and 4, when the wheel is folded and upright, the wheel touches the ground and can be used for lateral movement.

The foldable stepladder of Patent Document 3 can be used in the same manner as a general stepladder by expanding the lower side of the main body and the auxiliary body as shown in FIG. 1, and as described above, the wheels are grounded at this time. Since it does not, there is no danger of moving in a delusional manner during work. Then, as described above, once the wheels are folded, the wheels can be grounded and moved (laterally moved).

However, as described above, in the foldable stepladder of Patent Document 3, if it is folded as described above, it can be moved laterally, but in the work of repeating the movement to the side, the work is performed. It is inconvenient to have to fold each time you move because it is troublesome and you cannot do speedy work. In addition, since it moves with two wheels on both sides, when moving, it actually moves with two wheels in front and behind instead of left and right, and it moves in a very unstable state due to its relationship with the center of gravity. There is a problem.
In the foldable stepladder of Patent Document 3, even when the main body and the auxiliary body are opened, if the main body side is upright, the wheels are in a grounded state, and lateral movement is possible using this. That is certain. However, such a usage pattern becomes even more unstable movement as compared with the unstable movement as described above, and is not recognized as a stable usage that can be easily performed.

Utility Model Registration No. 3091883 Japanese Unexamined Patent Publication No. 2005-273304 Utility Model Registration No. 3141773

The present invention solves the conventional problems including the portable stepladders of Patent Documents 1 to 3 described above, and works on a plurality of high-place work places arranged at appropriate intervals in the horizontal direction. As described above, in order to facilitate the work while continuously moving in the lateral direction, the lateral movement can be easily performed in the used state (the stepladder is open), and when used as a stepladder, The problem to be solved is to provide a portable stepladder that can be used safely without the problem of moving in a delusional manner due to the wheels used for movement.

In 1 of the present invention, two sets of ladder frames composed of two side legs and a cross rail arranged between them are connected to each other so as to be openable and closable at the upper portions thereof, and the opening degree is restricted in the middle of both ladder frames in the vertical direction. Wheels attached to the lower side surfaces of the side legs on the same side of both ladder frames of the stepladder body and the stepladder body having the regulating portion arranged on the stepladder body, and the stepladder body is attached to the same side of both ladder frames. The wheels attached so that when the side legs are tilted to the lower side, they touch the ground and can move to the side, and when they stand up, they do not touch the ground and cannot move. It is a portable stepladder composed of.

It should be noted that one of the two sets of ladder frames is literally a ladder frame, and the cross rail needs to be a step ladder for climbing upward with a foot on it, but the other ladder frame is literally. It does not have to be a ladder frame of the above, but a frame body having a similar shape may be used. Therefore, the cross rail of the other ladder frame does not necessarily have to be a tread rail, but simply a means for connecting and holding the side legs on both sides at regular intervals with a certain strength or higher.

In the second aspect of the present invention, in the portable stepladder of the first aspect of the present invention, the stepladder body is also attached to the lower side surface of each side leg on the other side of the two ladder frames, and the stepladder body is also attached to each of the other sides of the two ladder frames. Wheels were installed so that when the side legs were tilted to the lower side, they would touch the ground and move sideways, and when they were stood up, they would not touch the ground and could not move. It is a thing.

According to the portable stepladder of 1 of the present invention, when it is normally used as a stepladder, the lower side of both ladder frames of the stepladder body is separated by a predetermined interval (the regulation unit), just like a general stepladder. It can be used in a stable state by expanding it (up to the regulation limit of). That is, the worker installs this stepladder at the required place and then raises it to the required height position by using the step ladder (horizontal rail) arranged inside the legs on both sides of either ladder frame. After that, you can work safely. Wheels are arranged on the lower side surface of the side legs of both ladder frames, but these wheels are placed on the floor on which the stepladder is installed in the normal use state of the stepladder due to its mounting position. There is no contact. Therefore, the portable stepladder of the present invention does not cause a problem that it moves unnecessarily when it is used while standing on the ground or on the floor, and it can be used extremely safely.

On the other hand, when the work at the installation position is completed and you want to move to the next work place, tilt the stepladder body to the side where the wheels are arranged, and the wheels will touch the ground. , These wheels allow easy lateral movement. It is extremely convenient when the work is to be installed at a high place on the wall surface continuously at constant or indefinite intervals in the horizontal direction, or when the work is repeated at a high place while moving to the side at those intervals. , It is convenient.
The movement is performed by two wheels arranged on the lower side surface of the side leg on one side of both ladder frames of the stepladder body, that is, two wheels parallel to the moving direction, and the movement is performed in an extremely stable state. It is also something that is said.

According to the portable stepladder of 2 of the present invention, this can also be used as a stepladder in a stable state in exactly the same manner as a general stepladder, just like the portable stepladder of 1 of the present invention. it can.
Further, according to the portable stepladder of 2 of the present invention, it is possible to tilt and move the stepladder diagonally to either side of the stepladder body, and the operator can move the stepladder to a convenient side according to the standing position. It can be moved to the side by defeating it. In that sense, it is even more convenient and easy to use.

Front view of the portable stepladder of the embodiment with the lower part open. Left side view of the portable stepladder of the embodiment with the lower part open. The front view of the portable stepladder of the embodiment in a closed (folded) state. Left side view of the portable stepladder of the embodiment with the lower part closed (folded). Front view of the portable stepladder of the embodiment with the lower part open and tilted to the left. The left side view of the portable stepladder of the embodiment with the lower part closed and tilted to the left.

Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the accompanying drawings based on examples.

As shown in FIGS. 1 to 6, the portable stepladder of this embodiment comprises two side legs 1, 1 and three stepladders (horizontal rails) 2, 2, 2 arranged between them. Two sets of ladder frames 3a and 3b are connected to each other so as to be openable and closable at their uppermost portions via a rotary connecting portion 4, and between the ladder frames 2 and 2 located in the middle of the two ladder frames 3a and 3b in the vertical direction. A stepladder body A that regulates the opening degree and allows the closing operation to be performed, and the lower side surfaces of the side legs 1 and 1 on the same side of both ladder frames 3a and 3b of the stepladder body A. In addition, moving wheels 6 and 6 are attached to the side legs 1 and 1 so that the stepladder main body A can be moved in a state of being tilted diagonally.

As shown in FIGS. 1 to 6, the stepladder main body A is basically an existing one, and each part will be outlined.
The side legs 1, 1, ... Are made of column-shaped members made of a lightweight alloy such as an aluminum alloy, and as shown in FIGS. 1 to 6, the floor surface or the like on which the stepladder is installed is at the lower end thereof. It is coated with a plastic exterior material 7 that protects the vehicle from being damaged.

As shown in FIGS. 1, 3, 5 and 6, the treads 2, 2 ... Are oriented orthogonally (horizontally) between the two side legs 1 and 1 of the ladder frames 3a and 3b, respectively. ), And the ladder frames 3a and 3b are oriented and fixed so as to be substantially horizontal in the fully open state on the floor where the ladder frames 3a and 3b may be arranged. .. The material is made of an aluminum alloy or the like similar to those of the side legs 1, 1, ... Further, the intervals between the three-stage treads 2, 2 and 2 arranged between the side legs 1 and 1 of the ladder frames 3a and 3b are set to be approximately equal, so that the operator can easily step on them and climb up. To do. As shown in FIGS. 2 and 4, each of the ladder frames 2, 2 and 2 of each ladder frame 3a and 3b has a brim-shaped portion 2f, 2f and 2f whose upper portion slightly projects inward. The area that workers can step on when going up and down is expanded.

The ladder frames 3a and 3b have a configuration as can be understood from the above description of each part, and as described above, the ladder frames 3a and 3b are openably and closably connected to each other via the rotary connecting portion 4 at their uppermost portions. is there.

As shown in FIGS. 2 and 3, the rotary connecting portion 4 is located on the side of the connecting plate portion 4a fixed between the upper ends of the side legs 1 and 1 of the one ladder frame 3a and the other ladder frame 3b. The coupling plate portions 4b fixed between the upper ends of the legs 1 and 1 are pivotally attached to each other at their inner ends so as to be rotatable about each other.

As shown in FIGS. 2 and 4, brackets 4a1 and 4a1 extending toward the other connecting plate portion 4b are configured on both inner ends of one connecting plate portion 4a, and the other connecting plate portion 4b also has brackets 4a1 and 4a1. Brackets 4b1 and 4b1 are configured on both sides of the inner end at slightly wider intervals so as to extend to the one connecting plate portion 4a side. The tips of the latter brackets 4b1 and 4b1 are arranged so as to advance to the immediate outer side of the tips of the former brackets 4a1 and 4a1. Shaft members (not shown) are rotatably arranged at the tips of the former brackets 4a1 and 4a1, and both ends of the shaft members project from both ends of the brackets 4a1 and 4a1. Further, both ends of the shaft member are fixedly attached to the insides of both tips of the latter brackets 4b1 and 4b1. In this way, the upper portions of both ladder frames 3a and 3b are rotatably connected by the rotary connecting portion 4. Both ladder frames 3a and 3b can be opened and closed on the lower side by such an upper rotation operation.

As shown in FIGS. 1 to 6, the regulation unit 5 is arranged between the uppermost steps 2, 2 and 2 of the ladder frames 3a and 3b. As shown in FIGS. 1 to 6, two fixed arms 5a and 5a are placed diagonally downward on both sides of the uppermost tread 2 of one ladder frame 3a, and the uppermost tread of the other ladder frame 3b. Two fixing arms 5b and 5b are fixed to the lower ends of both sides of the crosspiece 2 diagonally downward inward, and the rear ends of the connecting arms 5a1 and 5a1 facing inward are attached to the tips of the former fixing arms 5a and 5a. It is rotatably attached to the shaft, and the rear ends of the connecting arms 5b1 and 5b1 facing inward are also rotatably attached to the tips of the latter fixed arms 5b and 5b. Further, as shown in FIGS. 1, 3, 5 and 6, an operation cylinder 5c is arranged between the tips of the connection arms 5a1, 5a1 and 5b1 and 5b1 on both sides, and the operation cylinder 5c and the connection arms on both sides are arranged. A shaft body penetrating the tips of 5a1, 5a1 and 5b1, 5b1 is passed through, and retaining 5c1 is applied to both ends of the shaft body.

As shown in FIGS. 1, 3, 5 and 6, the other connecting arms 5b1 and 5b1 on the ladder frame 3b side are pivotally attached to the fixed arms 5b and 5b with their bases slightly outward. In particular, as shown in FIGS. 3 and 6, the tip of the connecting arm 5a1 and 5a1 is arranged in a joined state slightly outward of the one connecting arm 5a1 and 5a1 after being bent inward in the middle. As shown in the figure and the like, each outer end of the shaft body penetrating the operation cylinder 5c penetrates the tip of the connecting arms 5a1 and 5a1 on one side in a rotatable state, and the outer side thereof is the other. Similarly, the tips of the connecting arms 5b1 and 5b1 on the side are rotatably penetrated, and the outer ends of the shaft bodies protruding to both sides are shown in FIGS. 2, 3, 4, and 6. As shown, the retaining 5c1 is applied to prevent it from coming off.

Further, the connecting arms 5a1 and 5a1 on the one ladder frame 3a side and the connecting arms 5b1 and 5b1 on the other ladder frame 3b side are the ladder frames 3a and 3b on both sides thereof as shown in FIG. The lengths are set so that they will be in a straight line when opened to the extent that a stable usage state can be ensured.

Therefore, when the stepladder main body A is operated so as to open the lower side by grasping the side legs 1, 1 ... Or the treads 2, 2 ... Of the ladder frames 3a and 3b on both sides, the upper rotary connecting portion 4 is opened. The opening degree is regulated when the lower part opens to the center and the connecting arms 5a1, 5a1 and the connecting arms 5b1, 5b1 of the regulating portion 5 are in a straight line state. Further, the connecting arms 5a1, 5a1 and the connecting arms 5b1, 5b1 are located on the dead point in this state, and the stepladder main body A closes unless an operation such as lifting the operation cylinder 5c is performed. It will never happen. Therefore, high stability is maintained. Needless to say, the stepladder body A can be closed below the operation cylinder 5c by pulling it up. When opening, it is possible to push down the operation cylinder 5c in addition to the above, but in this case, the stepladder main body A needs to be floated, so that the convenience is not high. As described above, it is more convenient to grasp the side legs 1, 1, ... Of both ladder frames 3a and 3b and operate the ladder frames 3a, 3b so that the lower side thereof opens.

As shown in FIGS. 1 to 6, the wheels 6 and 6 are attached to the lower side surfaces of the side legs 1 and 1 on the same side of both ladder frames 3a and 3b of the stepladder body A. As shown in the figure, the wheels 6 and 6 touch the ground when the stepladder body A is tilted diagonally to the side legs 1 and 1 to which the wheels 6 and 6 are attached, and the wheels 6 and 6 are grounded in the lateral direction, that is, both ladder frames 3a. 3b is arranged in a direction that allows it to move forward and backward in the lateral direction. More specifically, they are arranged so that they can move freely in the left-right direction in FIGS. 1, 3, 5 and 6, and in the front-back direction in FIGS. 2 and 4.

As shown in FIGS. 1 to 6, the wheel 6 is arranged between the bracket portions 6a and 6a on both sides, and a rotating shaft fixed through the center thereof is rotatably attached to the bracket portions 6a and 6a. Further, the base portion 6b of the bracket portions 6a and 6a is fixed to the lower side surfaces of the side legs 1 and 1 on the same side of both ladder frames 3a and 3b with bolts 6c, 6c ... As described above. The positional relationship is as described above, and as shown in FIGS. 5 and 6, the wheels 6 and 6 are in contact with the ground in a state where the stepladder body A is tilted diagonally to the side to which the wheels 6 and 6 are attached. It is defined so that it can be done.

Therefore, according to the portable stepladder of this embodiment, the usage as a stepladder is, of course, exactly the same as that of the general one, while the portability of this stepladder has an advantage that its lateral movement can be performed extremely easily and speedily. There is.

As the stepladder, the lower side of both ladder frames 3a and 3b of the stepladder body A can be expanded to the regulation limit of the regulation portion 5 and used in a stable state. As described above, grasp the side legs 1, 1 of each of the two ladder frames 3a and 3b, or the treads 2 and 2 of each, and spread the lower side of the two ladder frames 3a and 3b. Finally, as shown in FIG. 2, one connecting arm 5a1, 5a1 and the other connecting arm 5b1, 5b1 of the regulating unit 5 are in a linear state, and the opening degree thereof reaches that level ( It is regulated by the opening shown in the figure).

In this state, the operator arranges this stepladder at a required place (working place), and then arranges the stepladder inside the legs 1 and 1 on either side of the ladder frames 3a and 3b. You can work safely after climbing to the required height position using the ladders 2, 2 and 2. As described above, and as shown in FIGS. 1 to 6, wheels 6 and 6 are arranged on the lower side surfaces of the side legs 1 and 1 of both ladder frames 3a and 3b. Reference numeral 6 denotes a normal use state in which the stepladder body A is erected so that the lower ends of all side legs 1, 1 ... Are in contact with the floor surface f, as shown in FIGS. 1 and 2, in relation to the mounting position thereof. Then, the wheel itself (wheels 6 and 6) does not come into contact with the floor surface f.

Therefore, the portable stepladder of this embodiment does not have a problem of moving unnecessarily on the floor surface f or other surface, for example, in the state of being raised on the ground, and is used extremely safely. It can be done. Further, both ladder frames 3a and 3b of the stepladder main body A also have the connecting arms 5a1 and 5a1 and the connecting arms 5b1 and 5b1 of the regulating portion 5 located on the dead points in the horizontal straight line state at this time, and the operation cylinder 5c. If you do not lift the ladder, there is no risk of it closing unnecessarily, and safety can be ensured in that respect as well.

On the other hand, when the work at the installation position is completed and it is desired to move to the next work place, the stepladder body A can be tilted to the side where the wheels 6 and 6 are arranged, and FIG. As shown, the wheels 6 and 6 are in contact with the ground and can be easily moved laterally by these wheels 6 and 6.
When the work is to install some equipment continuously at a high place on the wall surface of the building at constant or indefinite intervals in the horizontal direction, or when the work at a high place is repeated while moving to the side at those intervals. Extremely convenient and convenient.
Further, the movement is performed by the two wheels 6 and 6 arranged on the lower side surface of the side legs 1 and 1 on one side of the ladder frames 3a and 3b of the stepladder body A, that is, the two wheels 6 located on both sides in the traveling direction. , 6 is performed, and the stepladder main body A is not likely to wobble, and is also performed in an extremely stable state.

After the work is completed, as shown in FIGS. 3 and 4, the lower side of both ladder frames 3a and 3b of the stepladder body A can be closed by lifting the operation cylinder 5c of the regulation unit 5. .. Then, as shown in FIG. 6, even in this closed state, if the wheels 6 and 6 are tilted diagonally to the position side, the wheels 6 and 6 come into contact with the floor surface f and the stepladder main body A can be easily moved. Can be made to.
Needless to say, after the work is completed, the stepladder main body A may not be closed, but may be tilted as described above to move to the required position as it is, and then closed.

As described above, in this embodiment, the wheels 6 and 6 are provided only at the lower part of the side legs 1 and 1 on the same one side of both ladder frames 3a and 3b, but they can also be arranged on both sides. .. In such a case, the stepladder main body A can be tilted and moved to either side, and the operator can tilt and move the stepladder body A to a convenient side according to the standing position. In that sense, it will be more convenient and easy to use.

The portable stepladder of the present invention can be used in the industrial field of manufacturing the stepladder and in the field of construction using the same.

1 side leg 2 tread (horizontal rail)
2f Collar-shaped part 3a, 3b Ladder frame 4 Rotating connecting part 4a Connecting plate part 4a1 Connecting plate part bracket 4b Connecting plate part 4b1 Joint plate part bracket 5 Restricting part 5a Fixed arm 5a1 Connecting arm 5b Fixed arm 5b1 Connecting arm 5c Operation cylinder 5c1 Retaining 6 Wheels 6a Bracket part 6b Bracket part base 6c Bolt 7 Exterior material A Stepladder body f Floor surface

Claims (2)

Two sets of ladder frames consisting of two side legs and a cross rail arranged between them are connected to open and close at the upper part of them, and a regulation part that regulates the opening is arranged in the middle of both ladder frames in the vertical direction. The main body of the stepladder
Wheels attached to the lower side surfaces of the side legs on the same side of both ladder frames of the stepladder body, and the stepladder body is tilted so that the side legs of the side legs on the same side of both ladder frames are on the lower side. The attached wheels so that they can move to the side by touching the ground when they are in contact with each other, and they cannot move without touching the ground when standing up.
A portable stepladder composed of. The stepladder body is also grounded on the lower side surface of each side leg on the other side of both ladder frames when the stepladder body is tilted so that the side surface side of each side leg on the other side of both ladder frames is downward. The portable stepladder according to claim 1, wherein the wheels are attached so that the stepladder can be moved sideways, and when it is erected, it does not touch the ground and cannot move.

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