JP7374753B2 - retractable scaffolding - Google Patents

Description

Embodiments of the invention relate to retractable scaffolding.

For example, there are cases where inspections are performed on equipment installed at a high location on a pole, such as several meters above the ground. In order to inspect equipment, etc. at a high place on a pole where there is no scaffolding, it is necessary to prepare an aerial work vehicle, for example. Depending on site conditions, it may be difficult to get the aerial work vehicle close to the pole. For this reason, it is common practice to attach simple scaffolding to poles to perform inspection work on equipment and the like at high places.

Japanese Unexamined Patent Publication No. 7-102827 Japanese Patent Application Publication No. 7-62856 JP2011-239588A

Since the scaffold may be left attached to a pole for a while, for example, it is preferable to store it as compactly as possible.

The problem to be solved by the present invention is to provide a retractable scaffold that can be stored compactly.

According to the embodiment, the retractable scaffold includes a base fixed directly or indirectly to a pole extending upward from the ground, a rotating shaft supported by the base and extending horizontally, a rotating part, and a pin. The present invention includes a shaped stopper, a stopper fixing portion, and a pillar mounting fitting . The rotating part has an axis of rotation between a storage position where the top surface is facing the pole on which a worker can ride, and a use position where the top surface is facing upward and a worker can ride on the top surface. The footboard is rotatable about a pivot, and the footboard has a rotation restriction portion that restricts the rotation of the footboard by abutting against the base when the footboard is in the use position. The stopper is connected to the pole via a connecting member. The stopper fixing part is provided at an end of the rotating part at a position spaced apart from the rotation axis, and has a hole shape into which the lower end of the stopper can be fitted. The pole fitting is fixed to the pole above the base and has an insertion tube through which the stopper is inserted in the vertical direction, and when the treadle is in the storage position, the lower end of the stopper passes through the insertion tube and is inserted into the stopper fixing part. mated to.

A schematic diagram showing an example of an installation position of a pole to which a retractable scaffolding according to an embodiment is attached. FIG. 2 is a schematic diagram showing a state in which the retractable scaffolding according to the embodiment is attached to a pole and a worker is riding on the tread of the retractable scaffolding. FIG. 3 is a schematic diagram showing that the tread of the retractable scaffold shown in FIG. 2 is movable between a storage position (solid line) and a use position (dashed line). FIG. 4 is a schematic diagram showing the retractable scaffolding shown in FIG. 3 with the treads in the use position. A schematic diagram along the VV line in FIG. 4. FIG. 1 is an exploded perspective view of a retractable scaffolding according to an embodiment. FIG. 7 is a schematic exploded perspective view showing a state in which some parts of the retractable scaffold shown in FIG. 6 are fixed to each other. FIG. 3 is a schematic perspective view of the retractable scaffold shown in FIG. 2; FIG. 3 is a schematic exploded perspective view showing the relationship between the step board and the stopper assembly of the retractable scaffold shown in FIG. 2; FIG. 10 is a schematic diagram showing a stopper insertion fitting of a column mounting fitting of the stopper assembly shown in FIG. 9; 11 is a schematic diagram showing the stopper insertion fitting seen from the direction of arrow XI in FIG. 10. FIG. 10 is a schematic diagram showing a connecting member and a stopper of the stopper assembly shown in FIG. 9. FIG. FIG. 6 is a schematic diagram showing a modification of the rotary shaft rod at the position XIII in FIG. 5 of the retractable scaffold according to the embodiment. FIG. 4 is a schematic diagram showing a first modification of the storage position of the tread of the retractable scaffold shown in FIG. 3; FIG. 4 is a schematic diagram showing a second modification of the storage position of the tread of the retractable scaffold shown in FIG. 3;

Hereinafter, a retractable scaffold (compact scaffold) 10 according to an embodiment will be described with reference to the drawings. The drawings may be schematic or conceptual.

FIG. 1 shows the installation position of a pole 4 built on the ground in a park, for example. As shown in FIG. 1, the pole 4 is located in a park, for example, adjacent to a staircase S leading to a ground G.

FIG. 2 shows a pole 4 extending upward from the ground in a park, equipment (object to be inspected) 8 such as a surveillance camera attached above the pole 4, and a retractable scaffold 10 attached to the pole 4.
As shown in FIG. 2, the lower end of the pole 4 is firmly fixed to a foundation 6 made of concrete, for example. In this embodiment, the pole 4 extends straight upward from the foundation 6. The height H of the pole 4 is, for example, about 8 m. The pole 4 includes a step bolt 4a. The step bolt 4a may not exist.
The upper end of the pole 4 may be bent, for example, into an L-shape or a J-shape.

Devices 8, such as surveillance cameras, mounted at a high location on the pole 4 need to be inspected from time to time. For example, if it is difficult to bring an aerial work vehicle close to the pole 4, a retractable scaffold 10 can be attached to the pole 4 as shown in FIG. The retractable scaffold 10 is formed to be able to withstand an appropriate amount of weight, such as 100 kg, when tools, parts, etc. are placed on it in addition to the weight of the worker P. FIG. 2 shows a situation where a worker (inspector) P rides on a step board 64 (described later) of the retractable scaffold 10 and inspects the equipment 8. The worker P can inspect the equipment 8 as well as install, replace, etc. the equipment 8 while riding on the step board 64 of the retractable scaffold 10.

In this embodiment, the equipment 8 that is the object of inspection, installation, replacement, etc. includes, in addition to the surveillance camera shown in FIG. These include advertisements on overhead wires, traffic signals, and even telephone poles. In this embodiment, the poles 4 include steel pipe columns, concrete columns, steel pipe/concrete composite columns, steel plate assembly columns (Panzamast), wooden columns, trees (trees such as cedar), and the like. What the worker P can do while riding on the step board 64 of the retractable scaffolding 10 is not only inspecting, installing, and replacing the equipment 8 described above, but also removing branches from trees in the forest.

The retractable scaffold 10 can be used outdoors, such as on a pole 4 installed in a park, and can also be used indoors, for example, when inspecting lighting installed at a high place.

FIG. 3 shows a retractable scaffold 10 attached to a pole 4. A solid line in FIG. 3 indicates a state in which the retractable scaffold 10 is in the retracted position. The broken line in FIG. 3 shows the state in which the retractable scaffold 10 is in the use position.

As shown in FIG. 3, an XYZ orthogonal coordinate system is set with the retractable scaffold 10 attached to the pole 4. Hereinafter, the X-axis direction is defined as the depth direction (front-back direction) in a state where the retractable scaffolding 10 is attached to the pole 4. If the cross section of the pole 4 is circular, the X-axis direction is parallel to one of the radial line segments connecting the outer peripheral surface of the pole 4 and the central axis of the pole 4. The Y-axis direction in a state where the retractable scaffolding 10 is attached to the pole 4 is defined as the left-right direction. Assuming that the pole 4 has a circular cross section, the Y-axis direction is parallel to a tangent to the outer peripheral surface of the pole 4, which is perpendicular to the above-mentioned line segment. The Z-axis direction in a state where the retractable scaffolding 10 is attached to the pole 4 is defined as the up-down direction. The X-axis direction and the Y-axis direction are preferably parallel to the ground, but may be tilted as appropriate. The Z-axis direction is preferably perpendicular to the ground, but may be inclined as appropriate.

FIG. 4 shows a retractable scaffold 10 attached to a pole 4. FIG. 4 shows the retractable scaffold 10 in the use position.

FIG. 5 shows a partial cross-sectional view taken along line VV in FIG. For this reason, FIG. 5 shows a view of the retractable scaffold 10 from above when the retractable scaffold 10 is in the use position.

As shown in FIGS. 3 to 5, the retractable scaffold 10 is attached to, for example, the outer peripheral surface of the pole 4 with a fixture 12a. Fixture 12a may be part of retractable scaffold 10.
For example, a flexible band is used as the fixture 12a. When a flexible band is used as the fixture 12a, the retractable scaffold 10 can be appropriately attached to the pole 4 regardless of the size (thickness) of the outer peripheral surface of the pole 4. Here, an example will be described in which two flexible bands are used as the fixtures 12a of the retractable scaffold 10 to the pole 4, but the number of flexible bands may be one, or three or more.

The retractable scaffold 10 includes a base 14 fixed to a pole 4 erected on the ground, a rotating shaft (rotating shaft) 16 supported by the base 14 and extending in the horizontal direction, and supported by the rotating shaft 16. It has a rotating part 18.

FIG. 6 shows an exploded perspective view of the parts constituting the retractable scaffold 10. The base 14 and pivot 18 components of the retractable scaffold 10 can be further disassembled, but are shown disassembled into nine components in FIG. The rotating portion 18 in FIG. 6 shows a state in which a footboard 64, which will be described later, is in a use position.

FIG. 7 shows an exploded perspective view of the parts constituting the retractable scaffold 10. FIG. 7 shows a state in which the retractable scaffold 10 is disassembled into five parts (components) that can be assembled by a worker P climbing on the pole 4. The rotating portion 18 in FIG. 7 shows a state in which the footboard 64 is in the use position.
The retractable scaffold 10 shown in FIG. 7 is made by appropriately combining the parts shown in FIG. 6, and has a base 14, a rotating shaft rod 16 extending in the horizontal direction, and a rotating part 18 as constituent elements.

As shown in FIGS. 6 and 7, the base 14 is formed, for example, as an integral component by combining a plurality of parts each formed from a plurality of plates into appropriate shapes. The rotating portion 18 is formed, for example, as an integral component by combining a plurality of parts, each of which is formed by forming a plurality of plates into appropriate shapes, with the tread plate 64. The base portion 14, the rotating shaft rod 16, and the rotating portion 18 are made of materials that have the strength to support the weight of the worker P, but are lightweight enough to be easily unloaded by the worker P's own power. It is preferable that the

As an example, the base 14 includes a first pole fitting 20 and a first fixture 30 that is fixed to the first pole fitting 20. The first pillar fitting 20 and the first fixing fitting 30 are each formed by processing a plate. The first pillar fitting 20 is preferably made of a metal material such as a general structural rolled steel material (SS material) that has been surface-treated to have weather resistance, such as by being coated with paint.

The first pole fitting 20 includes a contact fitting 22 having a curved contact portion 22a that comes into contact with the outer peripheral surface of the pole 4, and a flat plate 24. The abutment fitting 22 and the flat plate 24 are integrated, for example, by welding or the like. The radius of curvature of the contact portion 22a is the same as or larger than the radius of curvature of the pole 4. A pair of through holes 22b are formed in the abutment fitting 22, through which a fixture 12a such as a flexible band is passed. The contact portion 22a is fixed in a pressed state against the outer peripheral surface of the pole 4 by the fixture 12a. The flat plate 24 has a substantially rectangular shape, and is parallel to the YZ plane, for example, in a state where the first pole fitting 20 is attached to the pole 4. The thickness direction of the flat plate 24 coincides with the Y-axis direction. The flat plate 24 is used as an intermediate member for securely fixing the abutment fitting 22 and the first fixing fitting 30.

The first fixture 30 is fixed to the flat plate 24 of the first pole mounting fixture 20 . The first fixture 30 has a U-shape when viewed from the Z-axis direction, and includes a first wall 32, a second wall 34, and a third wall 36. Second wall 34 is sandwiched between first wall 32 and third wall 36. The first wall 32, the second wall 34, and the third wall 36 each have, for example, a flat plate shape. The first fixture 30 may be formed by bending one plate to form the first wall 32, the second wall 34, and the third wall 36, or the first wall 32, the second wall 34, and the third wall 36 may be formed by bending one plate. The plurality of plates forming the third wall 36 may be joined by welding. For the first fixture 30, it is preferable to use a metal material such as an SS material whose surface has been treated to have weather resistance, such as by being coated with paint.
The first wall 32 is parallel to the flat plate 24 of the first post fitting 20. The second wall 34 is parallel to the YZ plane. Third wall 36 is spaced from and parallel to first wall 32 .

The first wall 32 of the first fixture 30 of the base 14 is fixed to the flat plate 24 of the first pole mounting fixture 20, for example, by welding or the like.

An opening 38 is formed in the second wall 34 of the first fixture 30 along the Y-axis direction, through which the rotating shaft rod 16 is inserted.

The rotating shaft rod 16 is inserted through the opening 38 of the first fixture 30 . The center axis of the rotating shaft rod 16 is parallel to the Y-axis. The rotation shaft rod 16 is provided with a regulating member (falling prevention metal fitting) 42 that restricts movement of the rotation shaft rod 16 in the Y-axis direction relative to the base portion 14 and the rotating portion 18 . The regulating member 42 is, for example, a bolt, and a bolt hole 42 a that is concave or penetrating from the outer peripheral surface of the rotary shaft rod 16 in the radial direction of the rotary shaft rod 16 is formed at an appropriate position of the rotary shaft rod 16 .
The rotating shaft rod 16 is made of, for example, stainless steel. The length of the rotating shaft rod 16 is, for example, 300 mm. The diameter of the rotating shaft rod 16 is, for example, 16 mm.

As an example, the rotating part 18 includes a rotating metal fitting 50 and a tread plate part 60. The rotating metal fitting 50 is formed by processing a plate. The rotating metal fitting 50 is preferably made of a metal material such as an SS material that has been surface-treated to have weather resistance, such as by being coated with paint.

The rotating metal fitting 50 is L-shaped when viewed from the Z-axis direction when the retractable scaffold 10 is in the use position, and includes a first plate 52 and a second plate 54. The first plate 52 and the second plate 54 are each formed into, for example, a flat plate shape. The rotating metal fitting 50 may be formed by bending one plate to form the first plate 52 and the second plate 54, or by welding a plurality of plates forming the first plate 52 and the second plate 54. It may be joined by.

The first plate 52 is formed with an opening 56 along the Y-axis direction through which the rotating shaft rod 16 is inserted. The first plate 52 faces or contacts the second wall 34 of the first fixture 30 .

A footboard portion 60 is fixed to the second plate 54 of the rotating metal fitting 50. Since the rotating metal fitting 50 rotates around the rotating shaft rod 16 extending in the Y-axis direction, it has an L-shape when viewed from the X-axis direction when the retractable scaffold 10 is in the retracted position.

The footboard portion 60 includes a second fixture 62 that is fixed to the rotating fixture 50 and a footboard 64 that is fixed to the second fixture 62. The second fixture 62 abuts against the first fixture 30 of the base 14 to define the position of the footboard 64 in the use position. The second fixture 62 has an L-shape or a T-shape when viewed from the Y-axis direction. Here, as an example, a case will be described in which the second fixture 62 is L-shaped when viewed from the Y-axis direction. The width of the second fixture 62 is approximately the same as the width W of the footboard 64 along the Y-axis direction (see FIG. 5). The depth of the second fixture 62 is smaller than the depth L of the footboard 64 along the X-axis direction (see FIG. 5).

The second fixture 62 has an appropriate thickness. For the second fixture 62, it is preferable to use a metal material such as SS material whose surface has been treated to have weather resistance.
The second fixture 62 is fixed to the second plate 54 of the rotating fixture 50 by welding or the like, and has an abutment portion 62a that abuts against the third wall 36 of the first fixture 30 of the base 14; It has a support surface 62b that is fixed to the lower surface of the footboard 64 and supports the footboard 64. The abutment portion 62a and the support surface 62b are each formed into, for example, a flat plate shape. The second fixture 62 may be formed by bending one plate to form the abutting portion 62a and the supporting surface 62b, or by joining a plurality of plates forming the abutting portion 62a and the supporting surface 62b by welding. good. A portion of the abutting portion 62 a between the surfaces fixed to the second plate 54 abuts against the third wall 36 .

In this embodiment, the footboard 64 has a substantially rectangular parallelepiped shape. In the use position shown in FIG. 5, the footboard 64 has a width W along the Y-axis direction and a depth L along the X-axis direction. The width W and the depth L are each 400 mm, for example. The thickness T of the footboard 64 shown in FIG. 4 along the Z-axis direction is, for example, 12 mm.

As shown in FIGS. 6 and 7, the footboard 64 includes a frame 64a and a top surface 64b fixed to the top surface of the frame 64a. A support surface 62b of the second fixture 62 is fixed to a position of the frame 64a of the footboard 64 opposite to the top surface 64b and close to the base 14 by bolting, welding, or the like. The second plate 54 of the rotating metal fitting 50 is attached to the second fixing metal fitting 62 at an end 64c of the frame 64a of the footboard 64 that is close to or in contact with the third wall 36 of the first metal fitting 30 of the base 14. It is fixed together with the abutting portion 62a by bolting, welding, or the like. The end portion 64c of the footboard 64 is, for example, flush with the abutting portion 62a of the second fixture 62. When the footboard 64 is in the use position, the end portion 64c of the footboard 64 may be retracted toward the side away from the pole 4 with respect to the abutting portion 62a.
The top surface 64b of the footboard 64 is formed of a net-like expanded metal made of, for example, stainless steel. In this case, the top surface 64b of the footboard 64 achieves weight reduction while maintaining appropriate strength.

FIG. 8 shows an assembled perspective view of the retractable scaffold 10 shown in FIG. 6 or 7. That is, the retractable scaffold 10 shown in FIG. 6 or 7 is assembled as shown in FIG. 8. The rotating portion 18 in FIG. 8 shows the state of use position.

FIG. 9 shows an exploded perspective view of the stopper assembly 70. Stopper assembly 70 can be further disassembled, but is shown disassembled into three components in FIG.

As shown in FIG. 9, the stopper assembly 70 includes a second post fitting 72, a connecting member 74, and a stopper 76.

The second pole fitting 72 shown in FIG. 9 is fixed to the pole 4 by a fixture 12b as shown in FIG. Fixtures 12b may be part of retractable scaffold 10. For example, a flexible band is used as the fixture 12b. The second pillar fitting 72 is preferably made of a metal material such as stainless steel.
As shown in FIG. 9, the second pillar fitting 72 includes a fixing fitting 82 and a stopper insertion fitting 84. In the fixing fitting 82, an abutting fitting 82a and a plate 82b are integrated by bolting, welding, or the like.
The abutment fitting 82a has a pair of through holes 82c through which the fixture 12b passes.

FIG. 10 shows the stopper insertion fitting 84 viewed along the Z-axis direction.
FIG. 11 shows the stopper insertion fitting 84 viewed along the direction indicated by arrow XI in FIG. 10 (Y-axis direction).

In the stopper insertion fitting 84 shown in FIGS. 10 and 11, a plate 84a and a stopper insertion tube 84b are integrated by welding or the like. The plate 84a has a through hole 84c through which fasteners 86a and 86b such as bolts and rivets pass.

As shown in FIG. 9, the plate 82b of the fixing fitting 82 and the plate 84a of the stopper insertion fitting 84 are fastened, for example, by fasteners 86a and 86b.

FIG. 12 shows the connecting member 74 and the stopper 76. The connecting member 74 shown in FIG. 12 is, for example, a wire having appropriate flexibility. One end of the connecting member 74 is processed into a loop, for example, and a double ring 74a made of stainless steel, for example, is attached thereto. Double ring 74a is connected to stopper 76. The other end of the connecting member 74 is processed into a loop, for example, and a double ring 74b made of stainless steel, for example, is attached thereto. The double ring 74b is connected to the plates 82b and 84a of the second post fitting 72. The double ring 74a at one end of the connecting member 74 and the double ring 74b at the other end may be integrated with the connecting member 74, or may be formed separately from the connecting member 74. Here, the connecting member 74 is indirectly connected to the pole 4 via the second pole fitting 72 and the double ring 74b.

As shown in FIG. 12, the stopper 76 is pin-shaped. The stopper 76 is preferably made of a metal material such as stainless steel. The stopper 76 has a head portion 76a and a shaft portion 76b. The head portion 76a and the shaft portion 76b are both cylindrical. The outer diameter D1 of the head 76a is larger than the outer diameter D2 of the shaft portion 76b. The length L1 of the head 76a is shorter than the length L2 of the shaft portion 76b. A double ring 74a at one end of the connecting member 74 is connected to a through hole 76c in a head 76a of the stopper 76.

The inner diameter D3 of the stopper insertion tube 84b of the stopper insertion fitting 84 of the second pole fitting 72 shown in FIG. 10 is smaller than the outer diameter D1 of the head 76a of the stopper 76 shown in FIG. It is larger than D2. The length L3 in the Z-axis direction of the stopper insertion tube 84b of the stopper insertion fitting 84 of the second pole fitting 72 shown in FIG. 11 is shorter than the length L2 of the shaft portion 76b of the stopper 76 shown in FIG. 12.

As shown in FIG. 9 , a stopper fixing portion 78 is provided at an end (end surface) 64 d of the footboard 64 at a position spaced apart from the rotating shaft rod 16 . The stopper fixing portion 78 is hole-shaped and is formed to have an inner diameter comparable to the inner diameter D3 of the stopper insertion tube 84b of the stopper insertion fitting 84 shown in FIG. 10 of the second pole fitting 72. As shown in FIG. 3, the end of the shaft portion 76b of the pin-shaped stopper 76, which is remote from the head 76a, can be fitted into a stopper fixing portion 78 provided on the footboard 64.

Next, a method of installing such a retractable scaffold 10 will be explained. The retractable scaffold 10 is used by being installed on a pole 4 to which a device 8 such as a surveillance camera shown in FIG. 2 is fixed.

When installing the retractable scaffold 10 on the pole 4, it is preferable to properly attach the retractable scaffold 10 before erecting the pole 4, and then erect the pole 4. On the other hand, when attaching the retractable scaffolding 10 to the pole 4 that has already been erected, the retractable scaffolding 10 is attached, for example, in the following procedure.

The first pole fitting 20 and the first fixing fitting 30 shown in FIG. 6 are fixed in advance by welding to form the base 14 fixed to the pole 4 as shown in FIG. 7. The rotating metal fitting 50 and the footboard portion 60 shown in FIG. 6 are fixed in advance by welding to form the rotating portion 18 as shown in FIG. 7. That is, as shown in FIG. 7, in order to facilitate assembly of the retractable scaffold 10, a base 14, a rotating shaft 16, and a rotating portion 18 are prepared.
Note that when the first pole mounting fitting 20 and the first fixing fitting 30 shown in FIG. 6 are fixed in advance by welding to form the base portion 14 shown in FIG. 7, it is preferable to do this in a factory or the like. When the rotating part 18 shown in FIG. 7 is formed by fixing the rotating metal fitting 50 and the footboard part 60 shown in FIG. 6 in advance by welding, it is preferable to do this in a factory or the like.

When fixing the first pole fitting 20 and the first fixing fitting 30 shown in FIG. 6 on site to form the base 14 shown in FIG. 7, they may be fixed by welding or by bolts (not shown). It may also be fixed through holes, for example by bolting. When fixing the pivoting metal fitting 50 and the footboard section 60 shown in FIG. 6 on site to form the pivoting section 18 shown in FIG. It may be fixed by tightening.

As shown in FIG. 9, the fixing fitting 82 of the second pole fitting 72 and the stopper insertion fitting 84 are fixed with fasteners 86a and 86b, and the connecting member 74 is used to connect the second column fitting 72 and the stopper insertion fitting 84. Connect with. That is, to facilitate assembly of the retractable scaffold 10, the stopper assembly 70 is prepared.

The installer (worker) P climbs up the pole 4 using, for example, the step 4a of the pole 4. Using ropes (not shown), the fixtures 12a and 12b, the base 14, the rotating shaft 16, the rotating part 18, the regulating member 42, and the stopper assembly 70 are unloaded, and the retractable scaffolding 10 is assembled as follows, for example. .

As shown in FIGS. 3 to 5, the worker P passes, for example, a flexible band as the fixture 12a of the base 14 through the through hole 22b of the abutting metal fitting 22 of the first pole fitting 20, and The contact portion 22a of the pole 4 is pressed against the outer periphery of the pole 4, and the fixture 12a is wound around the outer periphery of the pole 4. Here, in this embodiment, as shown in FIG. 2, the pole 4 has a step bolt 4a. The worker P fixes the first pole fitting 20 of the first assembly 92 with a flexible band as the fixing device 12a, and thereby places the retractable scaffold 10 in a position shifted from the position of the step bolt 4a. The first pole fitting 20 is fixed. When the worker P fixes the first pole fitting 20 using, for example, a flexible band as the fixture 12a, the first pole fitting 20 is prevented from slipping down regardless of the thickness of the pole 4. In this way, the worker P fixes the base 14 to the outer peripheral surface of the pole 4.
When the base 14 is fixed to the outer peripheral surface of the pole 4, the X-axis direction and the Y-axis direction are determined. In this way, the X-axis direction and the Y-axis direction are determined by the part of the retractable scaffold 10 that is first attached to the pole 4.

As shown in FIG. 8, the operator P uses the pair of first plates 52 of the rotating fittings 50 of the rotating part 18 to hold the second wall 34 of the pair of first fixing fittings 30 of the base 14. The rotating fittings 50 of the rotating part 18 are arranged so as to sandwich the rotating parts 18. The operator P aligns the center axis of the opening 56 of the rotating fitting 50 of the rotating part 18 with the center axis of the opening 38 of the first fixing fitting 30 in the Y-axis direction. In this state, the worker P aligns the rotating shaft rod 16 with the central axis of the opening 56 of the second plate 54 of the rotating fitting 50 of the rotating part 18 and the second wall 34 of the first fixing fitting 30. The central axis of the opening 38 is inserted through the central axis of the opening 38. That is, the worker P inserts the rotating shaft rod 16 into the first fixing fitting 30 and the rotating fitting 50. Therefore, the rotating shaft rod 16 is supported by the base portion 14, and the rotating portion 18 supports the rotating shaft rod 16.

The worker P fixes bolts, for example, to the rotating shaft rod 16 as the pair of regulating members 42 . The pair of regulating members 42 are made to protrude from the outer circumferential surface of the rotating shaft rod 16. The first fixing fitting 30 and the rotating fitting 50 are arranged between the pair of regulating members 42 . Therefore, the operator P prevents the rotating shaft rod 16 from moving in the Y-axis direction relative to the base portion 14 and the rotating portion 18.

Here, with the worker P climbing on the pole 4, the base 14, the rotating shaft rod 16, and the rotating part 18 of the retractable scaffold 10 shown in FIG. 7 are combined to form the retractable scaffold 10 shown in FIG. An example of how to assemble the . Before the worker P climbs the pole 4, the base 14, the rotating shaft rod 16, and the rotating part 18 of the retractable scaffold 10 may be assembled in advance as shown in FIG. 8. The worker P may simply lift the retractable scaffolding 10 assembled in this manner and fix the retractable scaffolding 10 to the pole 4 using the fixtures 12a.

In this state, the tread plate 64 of the tread plate portion 60 is rotatable between the use position (see FIGS. 4 and 5) and the storage position (see the solid line in FIG. 3) using the rotary shaft rod 16 as a pivot. be.
As shown in FIG. 3, the worker P further attaches, for example, a flexible band to the abutting metal fitting 82a of the second pillar fitting 72 of the unloaded stopper assembly 70 as the fixture 12b of the second pillar fitting 72. While passing through the through hole 82c, the abutment fitting 82a is pressed against the outer periphery of the pole 4, and the fixture 12b is wound around the outer periphery of the pole 4. At this time, the operator P arranges the axial direction of the central axis of the stopper insertion tube 84b of the stopper insertion fitting 84 of the second pole fitting 72 to be parallel to the Z-axis direction. The worker P added about a few centimeters to the length L of the tread plate 64 to attach the fixture 12 of the first pole fitting 20 and the fixture 12b of the second pole fitting 72. distance away.

As shown in FIGS. 2 to 5, in this way, for example, the worker P installs the retractable scaffold 10 on top of the pole 4.

The worker P may first attach the stopper assembly 70 shown in FIGS. 3 and 9 to the pole 4, and then attach the base 14 shown in FIG. 7 or the retractable scaffold 10 shown in FIG. 8 to the pole 4. . In this way, the steps for assembling the base 14, rotating shaft rod 16, rotating portion 18, and stopper assembly 70 of the retractable scaffold 10 may be changed as appropriate.

Next, how to use the retractable scaffolding 10 will be explained.

The rotating part 18 including the footboard 64 is rotated around the rotating shaft rod 16 at a predetermined position between the storage position (see FIG. 3) and the use position (see FIGS. 4 and 5) with respect to the base 14. Can be rotated within range.
As shown in FIG. 3, the storage position of the footboard 64 is a position where the top surface 64b of the footboard 64 faces the pole 4. An example of the storage position of the footboard 64 is a position where the top surface 64b of the footboard 64 is parallel to the YZ plane.
As shown in FIGS. 4 and 5, the use position of the step board 64 is a position where the top surface 64b of the step board 64 is parallel to the XY plane.

As shown in FIG. 3, when the installation of the retractable scaffolding 10 to the pole 4 is completed, it is assumed that the step board 64 of the retractable scaffolding 10 is in the retracted position. When using the retractable scaffold 10, the worker P disengages the lower end of the pin-shaped stopper 76 of the stopper assembly 70 from the stopper fixing portion 78 provided on the step board 64.

With the lower end of the stopper 76 and the stopper fixing part 78 disengaged, the worker P moves the tread plate 64, with the top surface 64b of the tread plate 64 facing the pole 4, onto the top using the rotating shaft rod 16 as the pivot. The surface 64b is rotated in a direction away from the pole 4. As shown in FIGS. 4 and 5, the worker P places the step board 64 in the use position with the top surface 64b of the step board 64 facing upward along the Z-axis direction.

When the worker P places the footboard 64 in the use position, the second fixture 62 of the rotating portion 18 abuts against the third wall 36 of the first fixture 30 of the base 14 . When the footboard 64 is in the use position, the base 14 prevents the end 64c of the footboard 64 and the abutting portion 62a of the second fixture 62 from moving toward the pole 4. Therefore, the abutting portion 62a of the second fixture 62, together with the third wall 36, restricts the movement of the footboard 64 of the rotating portion 18 toward the base 14, that is, the abutting portion 62a of the second fixture 62 restricts movement of the footboard 64 of the rotating portion 18 toward the base 14. It is used as a rotation restriction part that restricts movement. At this time, the top surface (here, the upper surface) 64b of the footboard 64 on which the worker P rides is parallel to, for example, the XY plane.

As shown in FIG. 2, the worker P stands on the top surface 64b of the step board 64, which faces upward, with the step board 64 placed in the use position. In a state where the worker P is riding on the top surface 64b of the footboard 64, elastic deformation of the base 14, rotation shaft rod 16, and rotating portion 18 is suppressed as much as possible. When the worker P is riding on the footboard 64, the base 14 prevents the end 64c of the footboard 64 from moving toward the pole 4 due to the weight of the worker P. Therefore, the base 14 defines the position of the tread plate 64 of the rotating portion 18 when the tread plate 64 is in the use position. In this state, the worker P performs appropriate work such as inspection, maintenance, and replacement of the equipment 8.

When the appropriate work is completed, the worker P steps down from the top surface 64b of the footboard 64 and places his foot on, for example, the step bolt 4a.

The worker P rotates the footboard 64 and places it in the storage position where the top surface 64b faces the pole 4, as shown in FIG. When the footboard 64 is placed in the storage position, the abutting portion 62a of the second fixture 62 of the rotating portion 18 is separated from the third wall 36 of the fixture 30 of the base 14. When the operator P passes the stopper 76 downward from the top of the stopper insertion cylinder 84b, the stopper fixing portion 78 fits the lower end of the stopper 76. A top surface 64b of the footboard 64 on which the worker P rides faces the pole 4, and in this embodiment is parallel to the YZ plane, for example. At this time, the tread plate 64 prevents the tread plate 64 from rotating unintentionally even if it is exposed to wind. In the stopper 76, the outer diameter D2 of the shaft portion 76b of the stopper 76 and the hole diameter of the stopper fixing portion 78 are close to each other, so that the shaft portion 76b of the stopper 76 is prevented from unintentionally coming off from the stopper fixing portion 78.

In this way, when the worker P does not use the retractable scaffold 10 (when it is left unused), the worker P fixes the step board 64 in the retracted position with the stopper 76, as shown in FIG.

Note that if the retractable scaffolding 10 is to be used at a different location, the retractable scaffolding 10 is removed from the pole 4. At this time, the retractable scaffolding 10 is light enough to be easily unloaded by the worker P's manual power.

The worker P uses the retractable scaffolding 10 in this way.

When the retractable scaffolding 10 according to this embodiment is used by being attached to the pole 4, it is not necessary to use an aerial work vehicle, so the work cost can be reduced.
The retractable scaffolding 10 according to this embodiment is compact and easy to carry even by hand.
When the retractable scaffolding 10 according to this embodiment is not used while attached to the pole 4, the retractable scaffolding 10 can be stored compactly by fixing the tread 64 with the stopper 76.
The retractable scaffold 10 according to this embodiment can be fixed with a fixing device 12 such as a flexible band, for example. Therefore, the retractable scaffold 10 can be appropriately attached regardless of the size (thickness) of the pole 4.
Since the retractable scaffolding 10 according to this embodiment has a simple structure, manufacturing costs can be reduced.

In this embodiment, an example in which a pin-shaped stopper 76 is used as the stopper assembly 70 has been described, but various modifications are possible. For example, a wire of a hanging metal fitting can be used as the connecting member 74 that can be directly fixed to the pole 4 or indirectly fixed using the pole fitting 72 or the like. As the stopper 76, a hook with a latch of a hanging metal fitting can be used. For example, by using a hanging fitting having a hook with a latch, the top surface 64b of the footboard 64, etc., may be engaged with the hook to maintain the footboard 64 in the storage position. When placing the footboard 64 in the use position, for example, the engagement between the hook and the top surface 64b of the footboard 64 may be released.
The stopper assembly 70 may use a pin-shaped stopper 76, or instead of using the stopper 76, a magnet may be placed on at least one of the footboard 64 and the second pole fitting 72. The magnetic force of the magnet can also maintain the footboard 64 in the stored position. Further, the tread plate 64 can be placed in the use position against the magnetic force between the tread plate 64 and the second pole fitting 72.

The regulating member 42 may be fixed by screwing a bolt onto the rotating shaft rod 16, but a pin-shaped member may be used instead of the bolt. The pin-shaped regulating member 42 can be fixed by, for example, welding so as to protrude from the outer peripheral surface of the rotating shaft rod 16. The pin-shaped regulating member 42 may be fixed by being fitted onto the rotating shaft rod 16 by known means, for example.

As shown in FIGS. 5 and 8, an example has been described in which the regulating member 42 is fixed by bolting, welding, or the like from the outer circumferential surface of the rotating shaft rod 16 toward the central axis.
As shown in FIG. 13, for example, threaded portions 44a may be formed at both ends of the rotating shaft rod 16, and bolts 44b may be screwed into the threaded portions 44a. Such a structure also prevents the rotating shaft rod 16 from unintentionally coming off from the fixed fitting 30 and the rotating fitting 50.

An example in which a flexible band is used as the fixture 12a for fixing the first pole fitting 20 of the retractable scaffold 10 has been described. The fixing tool 12a is not limited to a flexible band, and various fixing means can be used. As the fixture 12a for fixing the first pole fitting 20 to the pole 4, instead of arranging the step bolt 4a at the position where the step bolt 4a is placed, a fixture that supports the first pole fitting 20 is used. It may be fixed. The first pole fitting 20 may be fixed to the step bolt 4a instead of to the outer peripheral surface of the pole 4 using the fixing tool 12a.
Similarly, an example in which a flexible band is used as the fixture 12b for fixing the second pole fitting 72 has been described. The fixing tool 12b is not limited to a flexible band, and various fixing means can be used. As the fixture 12b for fixing the second pole fitting 72 to the pole 4, a fixture for supporting the second pole fitting 72 may be fixed at the position where the step bolt 4a is arranged. The second pole fitting 72 may be fixed to the step bolt 4a instead of to the outer peripheral surface of the pole 4 using the fixing tool 12b.

In this embodiment, an example in which the retractable scaffolding 10 includes the base 14, the rotating shaft rod 16, and the rotating part 18 has been described. The base 14 may include a rotating shaft rod 16. The rotating portion 18 may include the rotating shaft rod 16.

(First modification)
A first modification of the storage position of the step board 64 of the retractable scaffolding 10 will be described using FIG. 14.

As shown in FIG. 14, the storage position of the treadle 64 is such that the end 64d of the treadle 64 away from the rotating shaft rod 16 (near the position where the stopper fixing portion 78 is formed) is close to or in contact with the pole 4. This is the position. In the first modification, assuming that the pole 4 is a cylinder, the distance along the X-axis direction between the end 64c of the top surface 64b of the footboard 64 that is close to the rotation axis rod 16 and the outer peripheral surface of the pole 4 The distance along the X-axis direction between the end portion 64d of the top surface 64b of the footboard 64 that is spaced apart from the rotating shaft rod 16 and the outer peripheral surface of the pole 4 is smaller than that.

For example, when the retractable scaffolding 10 is used indoors, the influence of the wind on the treadle 64 is less than that outdoors. Therefore, even if the stopper assembly 70 is not present, there is little possibility that the treadle 64 will be unintentionally placed in the use position, and the end 64d of the treadle 64 will remain in contact with the outer peripheral surface of the pole 4. It could be possible.

The rotation range of the footboard 64 of the retractable scaffold 10 according to the first modification includes the rotation range of the footboard 64 of the retractable scaffold 10 described in the first embodiment. Therefore, when the treadboard 64 of the retractable scaffold 10 according to the first modification is in the storage position, the treadboard 64 of the retractable scaffold 10 can be stored in the position shown in FIG. 3 as the storage position.

When using the retractable scaffolding 10 of the first modified example in which the storage position of the treadle 64 is shown in FIG. etc. can be used. In this case, the retractable scaffolding 10 can maintain the stowed position of the step board 64 in a stable state. These stopper assembly 70, the above-mentioned hook with a latch of the hanging metal fitting, and the magnet can be used not only when the retractable scaffolding 10 of the example shown in FIG. 14 is used outdoors, but also when used indoors. .

(Second modification)
A second modification of the storage position of the step board 64 of the retractable scaffold 10 will be explained using FIG. 15.

As shown in FIG. 15, in a second modification of the storage position of the footboard 64, when the pole 4 is assumed to be a cylinder, the part of the top surface 64b of the footboard 64 that is close to the rotation axis rod 16 and the pole 4 At a position where the distance along the X-axis direction between the outer circumferential surface of the pole 4 and the portion of the top surface 64b of the footboard 64 that is spaced apart from the rotating shaft rod 16 is greater than the distance along the X-axis direction from the outer circumferential surface of the pole 4. be.

In this case, in order to maintain the footboard 64 in the stored position, it is preferable to use a stopper 76 as in the example shown in FIG. 3. When maintaining the step board 64 according to the second modification in the storage position, in addition to the stopper assembly 70, a hook with a latch of the above-mentioned hanging fitting or the like can be used.

As shown in FIGS. 3, 14, and 15, the stowed position of the tread 64 of the retractable scaffold 10 only needs to face the pole 4, and the orientation of the top surface 64b of the tread 64 is also parallel to the YZ plane. There's no need. Therefore, when fixing the same second pole fitting 72 to the pole 4, the storage position of the treadboard 64 of the retractable scaffold 10 is such that if the outer diameter becomes smaller toward the top of the pole 4, the treadboard 64 Of these, the end 64d remote from the rotating shaft rod 16 is closer to the pole 4 than in the example shown in FIG. When fixing the same second pole fitting 72 to the pole 4, the storage position of the treadboard 64 of the retractable scaffold 10 is determined by the rotation of the treadboard 64 if the outer diameter increases toward the top of the pole 4. As shown in FIG. 15, the end 64d remote from the shaft 16 is further away from the pole 4 than in the example shown in FIG.

As described above, the retractable scaffold 10 according to the present embodiment including each modification includes a base 14 fixed to the pole 4 extending upward from the ground, and a rotating shaft supported by the base 14 and extending in the horizontal direction. 16, and a rotating portion 18 that supports the rotating shaft 16. The rotating portion 18 includes a footboard 64 on which the worker P can ride, and a rotation restricting portion 62. The footboard 64 rotates around the rotating shaft 16 between a storage position where the top surface 64b faces the pole 4 and a use position where the top surface 64b faces upward and allows the worker P to ride on the top surface 64b. It is possible to move. The rotation regulating portion 62 is provided on the tread plate 64 and abuts against the base 14 when the tread plate 64 is in the use position, thereby regulating the rotation of the tread plate 64.
According to this embodiment, by placing the footboard 64 in the storage position, it is possible to provide the storage scaffold 10 that can be stored compactly.

Further, it is preferable that the rotation regulating portion 62 is directed toward the pole 4 when the footboard 64 is in the use position. The base 14 preferably has a wall 36 against which the rotation restricting portion 62 is abutted when the footboard 64 is in the use position. According to this embodiment, since the rotation regulating portion 62 is abutted against the wall 36, the position of the tread plate 64 can be controlled even when the worker P stands on the top surface 64b while the tread plate 64 is in the use position. It can be stabilized.

The retractable scaffold 10 also includes a connecting member 74 whose one end is directly or indirectly connected to the pole 4, a stopper 76 connected to the other end of the connecting member 74, and a stopper 76 provided on the tread 64. It is preferable to have a stopper fixing part 78 that can fix the stopper 76. According to this form, the footboard 64 can be easily maintained in the storage position.

Furthermore, it is preferable that the retractable scaffolding 10 has a regulating member 42 that is attached to the rotating shaft 16 and restricts horizontal movement of the rotating shaft 16 with respect to the base 14 and the rotating portion 18. According to this form, it is possible to prevent the base portion 14, the rotating shaft 16, and the rotating portion 18 from unintentionally separating.

As described above, according to the embodiments including each modification, the retractable scaffolding 10 that can be stored compactly is provided.

Although not shown in the figure, like the retractable scaffold 10, a mounting part that can be rotated between a storage position and a use position and on which tools and parts used during maintenance of the equipment 8 are placed is placed on the upper part of the pole 4. It may also be installed above the retractable scaffolding 10.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.
The scope of claims as filed is appended below.
[1]
a base fixed to a pole extending upward from the ground;
a rotating shaft supported by the base and extending in the horizontal direction;
It has a top surface on which a worker can ride, and has a storage position in which the top surface faces the pole, and a use position in which the top surface faces upward and allows the worker to ride on the top surface. a footboard that is rotatable about the rotating shaft between the two;
a rotation regulating portion provided on the tread plate and abutting against the base when the tread plate is in the use position to restrict rotation of the tread plate;
and a rotating part that supports the rotating shaft.
Retractable scaffolding, including.
[2]
The retractable scaffold according to appendix [1], including a fixture for fixing the base to the pole.
[3]
The rotation restriction portion is oriented toward the pole when the footboard is in the use position,
The retractable scaffold according to appendix [1] or [2], wherein the base has a wall against which the rotation restricting portion is abutted when the tread is in the use position.
[4]
a connecting member whose one end is connected to the pole;
a stopper connected to the other end of the connecting member;
a stopper fixing part provided on the footboard and capable of fixing the stopper;
The retractable scaffold according to any one of additional notes [1] to [3], which has the following.
[5]
a pole mounting fitting fixed to the pole and having an insertion tube through which the stopper is inserted in the vertical direction;
The stopper is pin-shaped,
The retractable scaffold according to appendix [4], wherein the stopper fixing portion has a hole shape into which a lower end of the stopper can fit when the stopper is passed from above to below the insertion tube.
[6]
Any one of Supplementary Notes [1] to [5], comprising a regulating member attached to the rotating shaft and regulating horizontal movement of the rotating shaft relative to the base and the rotating part. Retractable scaffolding as described in .

4... Pole, 10... Retractable scaffolding, 12a, 12b... Fixture, 14... Base, 16... Rotating shaft rod, 18... Rotating part, 20... First pole fitting, 22... Abutment fitting, 24... Flat plate, 30... First fixing metal fitting, 32... First wall, 34... Second wall, 36... Third wall, 38... Opening, 42... Regulating member (falling prevention metal fitting), 50... Rotating metal fitting , 52...First plate, 54...Second plate, 56...Opening, 60...Tread plate portion, 62...Second fixture, 62a...Abutting surface, 62b...Supporting surface, 64...Tread plate, 64b...Top Surface, 70... Stopper assembly, 72... Second pillar fitting, 74... Connecting member, 76... Stopper, 78... Stopper fixing part, 82... Fixing metal fitting, 84... Stopper insertion fitting.

Claims (4)

a base fixed directly or indirectly to a pole extending upward from the ground;
a rotating shaft supported by the base and extending in the horizontal direction;
The rotary shaft is supported between a storage position where the top surface , on which a worker can ride, faces the pole, and a use position, where the top surface faces upward and the worker can ride on the top surface. a treadle that is rotatable as an axis ; and a rotating part having a rotation restriction part that restricts rotation of the treadle by being abutted against the base when the treadle is in the use position ;
a pin-shaped stopper connected to the pole via a connecting member;
A stopper fixing part that is provided at an end of the rotating part at a position spaced apart from the rotating shaft and has a hole shape into which a lower end of the stopper can be fitted;
It has an insertion tube that is fixed to the pole above the base and through which the stopper is inserted in the vertical direction, and when the treadle is in the storage position, the lower end of the stopper passes through the insertion tube and The pillar fitting that fits into the stopper fixing part and
Retractable scaffolding, including. the base is fixed to the pole by a fixture;
A retractable scaffold according to claim 1. The rotation restriction portion of the rotation portion is provided in a direction in which the footboard is directed toward the pole when the footboard is in the use position,
The base has a wall against which the rotation restricting portion is abutted when the footboard is in the use position.
The retractable scaffold according to claim 1 or claim 2. The retractable scaffold further includes a regulating member that is attached to the rotating shaft and restricts horizontal movement of the rotating shaft relative to the base and the rotating part.
The retractable scaffold according to any one of claims 1 to 3 .