JP2019210650A - ladder - Google Patents

Abstract

To provide a ladder whose handrail can be fixed to a post without exposing a screw or the like to the outside.SOLUTION: A ladder 1 includes a pair of hollow posts 10, treads 40 connecting the pair of posts 10 in a bridge manner, and handrails 50 provided on the posts 10, the posts 10 being provided with tread side members 11 which are disposed inside and to which the treads 40 are fixed, and handrail side members 12 which are disposed outside and to which the handrails 50 are fixed. The handrail 50 is provided with a screw threaded portion 51 into which a screw 100 for fixing the handrail is screwed. A screw 100 is inserted into an insertion hole 15 of the handrail side member 12 and a through hole 63 of a bracket 60 from the inside of the handrail side member 12 and screwed into a screw-threaded portion 51 to fix the handrail side member 12, the bracket 60 and the handrail 50.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a ladder used for going back and forth between a floor such as a loft and an attic.

  In order to make effective use of the interior space of the building, many buildings have been constructed with a loft for using the mezzanine floor as a storage space and an attic for using the ceiling as a storage. In such lofts and attics (in the present invention, these are collectively referred to as “upstairs”), ladders are used to move between the upstairs and downstairs.

  In this type of ladder, as described in Patent Document 1, hooks 15 </ b> A and 15 </ b> B are fixed to upper portions of a pair of support columns 2. When the upper hook 15A is hooked on the locking bar 16A on the wall surface and the lower end of the support column 2 is installed on the floor surface, the ladder is in a use state in which it is leaned against the wall surface in an inclined posture (FIG. 1 of Patent Document 1). reference). Further, when the lower hook 15B is hooked on the locking rod 16A, the ladder is in a housed state suspended along the wall surface (see FIG. 2 of Patent Document 1).

  Further, the ladder support is provided with a handrail to be grasped by a hand when the user moves up and down. As a structure for fixing the handrail to the support column, in Patent Document 1, a screw 11 is passed through the hole of the support column 2 and the handrail 4 from the support column 2 side, and this screw 11 is screwed to the inner piece 10 in the handrail 3 (patent (Refer FIG. 13 and FIG. 16 of literature 1).

  In the ladder of Patent Document 2, a fixing member 34 fixed to the column 12 with a rivet 42 and a clamping member 36 that clamps the handrail 16 are provided, and the screw 30 is inserted from the outside of the fixing member 34 to the clamping member 36 and the handrail. 16 and the handrail 16 is clamped between the fixing member 34 and the clamping member 36 by the fastening force of the screw 30 (see FIG. 7 of Patent Document 2).

JP 2002-242569 A JP 2005-16069 A

However, in the ladder described in Patent Document 1, since the screw head of the screw 11 is exposed from the support 2, the user's clothes may be caught by the exposed screw 11 (see FIGS. 13 and 13 of Patent Document 1). 16).
In the ladder described in Patent Document 2, the rivet 42 is exposed to the outside of the support column 12, and the screw head of the screw 30 is exposed to the outside of the fixing member 34. Further, when the screw 30 is exposed to the outside of the ladder, it looks bad (see FIG. 7 of Patent Document 2).
A first object of the present invention is to provide a ladder that can fix a handrail to a column without exposing a screw or the like to the outside.

In the ladder described in Patent Document 1, when the lower hook 15B is locked to the locking bar 16A and the ladder is suspended, the lower end portion of the column 2 is from the balance of the ladder using the locking bar 16A as a fulcrum. Contact the wall. For this reason, when the ladder is placed in a waiting state on the wall surface, the lower end of the support column 2 may hit the wall surface and damage or stain the wall surface (see FIG. 2 of Patent Document 1).
A second object of the present invention is to provide a ladder that does not damage or contaminate the wall surface at the lower end of the column when the ladder is in the stowed state.

  In order to achieve the first object, the first feature of the present invention is that a pair of hollow columns, a plurality of treads laid between the pair of columns, and a hollow handrail provided on the columns. The pair of struts includes a tread plate side member that is disposed on the inside and the tread plate is fixed to, and a handrail side member that is disposed on the outside and to which the handrail is fixed, A bracket for attaching the handrail to the handrail side member is provided between the handrail side member and the handrail, and the handrail includes a screw threaded portion into which a screw for fixing the handrail is screwed. The side member is provided with an insertion hole at a position corresponding to the screw threaded portion, and the bracket is formed with a through hole at a position corresponding to the screw threaded portion and the insertion hole. The insertion through the insertion hole and the through hole from the inside of the side member By di is screwed into the screw threaded portion, the handrail side member, said bracket and said handrail are fixed, it is characterized.

  According to the first feature, in the support column including the tread board side member disposed on the inside and the handrail side member disposed on the outside, the handrail is fixed by screwing from the inside of the handrail side member. It is possible to hide the screw head of the screw for fixing the handrail in the support column. Further, by fixing the handrail to the handrail side member using the bracket, any shape handrail can be stably fixed.

  According to a second aspect of the present invention, the bracket includes a handrail cap portion attached to an end portion of the handrail.

  According to the second feature, the bracket is positioned with respect to the handrail by attaching the handrail cap portion to the end portion of the handrail so that the through hole and the screwed portion are opposed to each other. This facilitates the screwing operation for fixing the handrail.

  A third feature of the present invention is that an upper end cap is attached to the upper end opening of the support column, and a tread plate side insertion plate portion and a handrail side insertion plate portion to be inserted into the upper end opening are provided on the upper end cap. The tread plate side insertion plate portion is locked to the tread plate side member, and the handrail side insertion plate portion is locked to the handrail side member, so that the tread plate side member and the handrail side member are attached to the upper end cap. It is fixed.

  According to the third feature, the tread board side member and the handrail side member can be easily fixed only by attaching the upper end cap to the upper end opening of the support column.

  In order to achieve the second object, a fourth feature of the present invention is that a support for suspending the support is provided on a wall surface, and an upper part of the support is attached to the support. And the hook includes a base portion that extends along the support column and a hook portion that protrudes from the base portion, and the support member includes a holding portion that hooks the hook portion, A receiving portion extending downward from the holding portion, and when the hook portion is hooked on the holding portion and the column is suspended along the wall surface, the upper portion of the column or the base portion is the receiving portion. And the lower end of the column does not contact the wall surface.

According to the fourth feature, when the support is suspended from the support, the upper part or the base of the support comes into contact with the receiving part, so that the movement of the lower end of the support to approach the wall surface is suppressed by the receiving part. It is possible to stabilize the posture in the stored state. Moreover, since the lower end part of a support | pillar does not contact a wall surface, a wall surface is not damaged or soiled by the lower end part of a support | pillar.
The fourth feature may be provided as a ladder support structure having the fourth feature. That is, a ladder support structure in which a plurality of treads are installed between a pair of columns, and a support for suspending the column is provided on a wall surface, and an upper part of the column is hung on the support A latch is provided, and the latch includes a base portion that extends along the support column and a hook portion that protrudes from the base portion, and the support member holds the hook portion. And a receiving portion extending downward from the holding portion, and when the hook portion is hooked on the holding portion and the column is suspended along the wall surface, the upper portion of the column or the base is It is in contact with the receiving portion, and the lower end portion of the support column does not contact the wall surface.

  According to the first to third features of the present invention, since a screw or the like is not exposed to the outside of the column or the handrail, the user does not touch the screw or the like, and the appearance of the ladder can be improved. Further, according to the fourth feature of the present invention, the posture of the ladder in the stored state can be stabilized, and the wall surface is not damaged or soiled at the lower end portion of the support column.

It is an example of an embodiment of a ladder concerning the present invention, and is a perspective view showing a use state of a ladder. FIG. 2 is a partially enlarged perspective view of FIG. 1. It is a disassembled perspective view which shows the support | pillar in the present Example, the bracket, and the upper part of a handrail. It is sectional drawing which shows the attachment state of the support | pillar and the lower part of a handrail in a present Example. (A) is a side view of the upper end cap in a present Example, (B) is a front view of an upper end cap. It is explanatory drawing which shows the attachment state of the support | pillar and tread in a present Example. It is a perspective view which shows the accommodation state of the ladder in a present Example. It is a side view which shows the accommodation state of the ladder in a present Example. It is a partial cross section figure which expands and shows the lower end part of the support | pillar of FIG. It is explanatory drawing which shows the state hooked on the receiving tool in a present Example.

Hereinafter, the form for implementing the ladder concerning the present invention is explained in detail with reference to drawings.
As shown in FIG. 1, the ladder 1 is an example of a ladder that is used to go back and forth between a loft and an attic floor. The ladder 1 includes a pair of struts 10, a plurality of treads 40 installed between the pair of struts 10, and a handrail 50 provided on the struts 10.

  As shown in FIGS. 3 and 4, each support column 10 is formed in a hollow shape having a substantially rectangular cross section. Each column 10 includes a tread board side member 11 to which the tread board 40 is fixed, and a handrail side member 12 to which the handrail 50 is fixed. In addition, in the support | pillar 10, it demonstrates below by making the tread 40 side into "inner side" and the handrail 50 side as "outer side."

  The tread board side member 11 is formed by extruding a metal material such as aluminum or an aluminum alloy. The tread board-side member 11 is formed in a substantially U-shaped cross section that is open to the outside, and is disposed inside the pair of support columns 10. On the side edge portions facing each other across the open portion of the tread board side member 11, a fitting groove portion 13 having an L shape in plan view is continuously provided in the longitudinal direction.

  The handrail side member 12 is formed by extruding a metal material such as aluminum or an aluminum alloy. The handrail side member 12 has a long plate shape and is disposed outside the pair of support columns 10. At the side end portion of the handrail side member 12, a fitting edge portion 14 that fits into the fitting groove portion 13 of the tread plate side member 11 is provided continuously in the longitudinal direction. The handrail side member 12 has an insertion hole 15 into which a screw 100 for fixing the handrail 50 is inserted at a position corresponding to a screw threaded portion of the handrail 50 described later. The insertion hole 15 has a larger diameter than the shaft portion of the handrail fixing screw 100 and a smaller diameter than the head of the screw 100.

  In the upper end portion of the tread board side member 11 and the upper end portion of the handrail side member 12, fitting holes 17 and 18 into which fitting protrusions of an upper end cap described later are fitted are formed, respectively. Two fitting holes 17 of the tread board side member 11 are formed along the depth direction. In addition, two fitting holes 18 of the handrail side member 12 are formed along the longitudinal direction at positions away from the insertion hole 15.

  An upper end cap 21 is attached to the upper end opening 16 of each column 10. The upper end cap 21 is made of a synthetic resin such as polypropylene, polyethylene, ASA resin, ABS resin, or polyvinyl chloride. As shown in FIG. 5, the upper end cap 21 includes a lid portion 22 that closes the upper end opening 16 of the support column 10. The lid portion 22 includes a wide tread board side insertion plate portion 23 and a narrow handrail side. The insertion plate portion 24 is erected opposite to the insertion plate portion 24. The tread plate-side insertion plate portion 23 is provided with a fitting convex portion 25 that fits into the fitting hole 18 of the tread plate-side member 11. A fitting projection 26 to be fitted is provided. When the tread plate side insertion plate portion 23 and the handrail side insertion plate portion 24 are inserted into the upper end opening 16 of the column 10 and the fitting convex portions 25 and 26 are fitted into the fitting holes 17 and 18, the tread plate side member 11 and The handrail side member 12 is fixed to the upper end cap 21.

As shown in FIG. 9, a metal lower end cap 27 is attached to the lower end of each column 10. The lower end cap 27 includes a flat bottom plate portion 28 that closes the lower end opening portion, and a pair of insertion plate portions 29 that rise substantially at right angles from both side edges of the bottom plate portion 28. Each insertion plate portion 29 is inserted into the lower end opening of the column 10, and each insertion plate portion 29 is screwed with a screw 101, whereby the lower end cap 27 is fixed to the lower end of the column 10. The bottom plate portion 28 is in contact with the lower end opening edge of the support column 10 so as not to enter the support column 10.
A synthetic rubber leg end tool 30 is attached to the lower end of each column 10 from above the lower end cap 27 so as to hide the screw 101 to which the lower end cap 27 is fixed. As shown by the phantom line in FIG. 9, the installation surface of the leg end tool 30 is formed in a circular arc shape in which the intermediate portion swells downward. Further, the leg end tool 30 is formed with a semi-cylindrical convex portion 31 on the wall surface side.

  The tread board 40 has a hollow plate shape and is made of a metal material such as aluminum or an aluminum alloy. As shown in FIG. 6, a screw hole 41 into which a tread board fixing screw 102 is screwed is provided inside the tread board 40, and the tread board fixing screw 102 is screwed into the screw hole 41 so that the tread board 40 is moved to the tread board side. It is fixed to the member 11. The tread board 40 is provided so as to be substantially horizontal with the floor surface of the downstairs when the support column 10 is leaned in an inclined state. At both end portions of the tread board 40, tread board caps 42 that close the openings of the tread board 40 are mounted.

  The handrail 50 is formed by bending a pipe-shaped member. As shown in FIG. 2, the upper part of the handrail 50 is curved in a substantially U shape, and the lower part of the handrail 50 is bent in a substantially L shape. At both ends of the handrail 50, screw screw portions 51 to which the handrail fixing screw 100 is screwed are provided. In the present embodiment, two holes 52 are formed in the handrail 50, and the blind nuts 53 respectively attached to the two holes 52 function as the screw threaded portions 51.

  At both ends of the handrail 50, brackets 60 for attaching the handrail 50 to the handrail side member 12 are provided. The bracket 60 includes a main body portion 61 having a substantially U-shaped cross section for supporting the handrail 50 and a handrail cap portion 62 attached to an end portion of the handrail 50. The main body 61 is provided with a through hole 63 through which the handrail fixing screw 100 passes at a position corresponding to the screw threaded portion 51 and the insertion hole 15. The handrail cap portion 62 includes a lid portion 64 that closes the opening portion 54 and a cylindrical plate portion 65 having a substantially C-shaped cross section that fits into the opening portion 54.

Next, a support structure for placing the ladder in the stowed state will be described.
As shown in FIGS. 7 and 8, the support structure of the ladder 1 includes a support member 80 provided on the wall surface and a hooking member 70 that is hung on the support member 80.
The latch 70 is formed by processing a metal plate such as a steel plate. The latching tool 70 includes a base portion 71 that extends along the support column 10 and a hook portion 72 that is bent and extended from the upper end portion of the base portion 71. The base 71 is formed in a plate shape and is fixed to the support column 10. The length of the base portion 71 is a length such that a receiving portion of a support 80 described later comes into contact with the base portion 71 when the column 10 is suspended along the wall surface. The hook portion 72 is formed to be bent in a substantially L shape.
In the present embodiment, the upper portion of each support column 10 is provided with a locking tool 70A used when the ladder 1 is put into use and a latching tool 70B used when the ladder 1 is put into a storage state in two stages. Is provided. The same upper stopper 70A and lower stopper 70B are used.

  The support tool 80 is formed by processing a metal plate such as a steel plate. The support 80 includes a holding portion 81 that hooks the hook portion 72 and a receiving portion 82 that extends downward from the holding portion 81. In this embodiment, the holding portion 81 is formed in a substantially trapezoidal cylindrical shape. A fixing portion 83 extending upward is provided on the wall side portion of the holding portion 81, and the fixing portion 83 is fixed to the wall surface by screws for fixing the support.

 As shown in FIG. 8, when the hook portion 72 is hooked on the holding portion 81, the receiving portion 82 receives the column 10 so that the lower end portion of the column 10 suspended from the support 80 does not contact the wall surface. . The receiving portion 82 includes an extending portion 84 that extends obliquely downward from the lower portion of the holding portion 81 and away from the wall surface, and a hanging portion that extends downward from the lower end of the extending portion 84 substantially parallel to the wall surface. 85. In this embodiment, when the hook portion 72 is hooked on the holding portion 81 and the support column 10 is suspended from the support 80, the hanging portion 85 contacts the base portion 71, and the support column 10 is substantially parallel to the wall surface. Supported.

  As shown in FIG. 10, a parting material 90 in which a recess 91 is formed is provided at an end edge of the upper floor surface. The parting material 90 is provided with a receiving tool 92 on which the holding tool 70 is hooked in order to put the ladder 1 into use. The receiving device 92 includes a metal receiving plate 93 that closes the recess 91, and the receiving plate 93 has a hook insertion hole 94 into which the hook portion 72 of the hooking device 70 is inserted. A hook receiving portion 95 that receives the hook portion 72 inserted into the hook insertion hole 94 is provided on the lower surface of the receiving plate 93.

  Usage state in which the ladder 1 is moved up and down by hooking the hook part 72 of the upper hooking tool 70A on the receiving member 92 on the parting member 90 and placing the leg end tool 30 of the column 10 on the floor surface below the floor. (FIG. 1). Further, the hook portion 72 of the lower hooking tool 70B is hooked on the holding portion 81 of the support tool 80, and the column 10 is suspended from the support tool 80, whereby the ladder 1 is placed on the wall surface. (FIG. 7).

Next, the state in which the handrail in the present embodiment is attached to the support will be described with reference to FIG.
First, the blind nut 53 is fixed to the upper hole 52 of the handrail 50. Next, the handrail cap 62 of the bracket 60 is attached to the opening of the handrail 50, and the through hole 63 of the bracket 60 is aligned with the position of the blind nut 53. Then, the bracket 60 is attached to the lower side of the handrail 50 by the same method. Next, the insertion hole 15 of the handrail side member 12 is aligned with the position of the through hole 63 of the bracket 60, and the handrail fixing screw 100 is attached to the upper side and the lower side of the handrail 50 from the inside of the handrail side member 12. It is inserted into the insertion hole 15 and the through hole 63 and screwed into the blind nut 53. Thereby, the upper side and the lower side of the handrail 50 are fixed to the handrail side member 12 via the bracket 60. Then, the fitting edge portion 14 of the handrail side member 12 to which the handrail 50 is fixed is inserted into the fitting groove portion of the footboard side member 11, and the handrail side member 12 is slid to attach the footboard side member 11 to the handrail side member 12. .

  Next, the upper end cap 21 is attached to the upper end opening 16 of the column 10. The step board side insertion plate portion 23 and the handrail side insertion plate portion 24 of the upper end cap 21 are inserted into the upper end opening portion 16 of the support column 10, and the fitting protrusion of the step plate side insertion plate portion 23 is inserted into the fitting hole 17 of the tread plate side member 11. While fitting the part 25, the fitting convex part 26 of the handrail side insertion plate part 24 is fitted into the fitting hole 18 of the handrail side member 12. Thereby, the lid 21 closes the upper end opening 16 of the support column 10, and the tread board side member 11 and the handrail side member 12 are fixed to the upper end cap 21. As described above, the tread board side member 11 and the handrail side member 12 can be easily fixed only by attaching the upper end cap 21 to the upper end opening 16 of the column 10.

  In the ladder 1 configured as described above, the screw 100 is screwed into the blind nut 53 from the inside of the handrail side member 12 to fix the handrail 50 to the handrail side member 12, and the handrail side on which the handrail 50 is fixed. Since the member 12 is attached to the tread board side member 11, the screw head of the screw 100 can be hidden in the hollow column 10 as shown in FIG. Thereby, since the screw 100 is not exposed outside the support column 10 and the handrail 50, the user does not touch the screw 100, and the appearance of the ladder 1 can be improved. Further, by fixing the handrail 50 to the handrail side member 12 using the bracket 60, even the cylindrical handrail 50 can be stably fixed.

  Since the bracket 60 includes a main body portion 61 in which a through hole 63 is formed and a handrail cap portion 62 attached to an end portion of the handrail 50, the through hole 63 and the blind nut 53 are opposed to each other. By attaching the handrail cap portion 62 to the end portion of the handrail 50, the main body portion 61 of the bracket 60 is positioned with respect to the handrail 50. Thereby, the screwing operation | work for fixing the handrail 50 becomes easy.

  When the hook 70B is hooked on the support 80 and the column 10 is suspended from the support 80, the base 71 of the hook 70B comes into contact with the receiving portion 82 of the support 80, and the lower end of the column 10 Since the part 82 receives the movement which tries to approach a wall surface, the attitude | position of the accommodation state of the ladder 1 can be stabilized. Further, in this embodiment, when the ladder 1 is stored, the support column 10 is supported substantially in parallel with the wall surface, so that the lower end portion of the support column 10 does not contact the wall surface, and the lower end portion of the support column 10 The wall will not be damaged or soiled. Further, in this embodiment, when the support column 10 is suspended from the support 80, the receiving portion 82 contacts the base portion 71, but does not contact the support column 10, so that the receiving portion 82 does not damage the support column 10. .

  As shown by the phantom line in FIG. 9, the installation surface of the leg end tool 30 is formed in an arc shape in which the intermediate portion swells downward, so that the inclination angle of the support column 10 when the ladder 1 is in use Even if they are slightly different, the leg end tool 30 can be stably installed on the floor. Moreover, since the semi-cylindrical convex part 31 is formed in the surface by the side of the wall at the leg end tool 30, even if the lower end part of the support | pillar 10 is accidentally bumped against the wall surface, the convex part 31 can soften an impact. be able to.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the summary of this invention, an appropriate change is possible. In the above-described embodiment, the ladder is used to go to the loft and the attic. However, the present invention is not limited to this and can be applied to other ladders. Moreover, in the above-mentioned embodiment, although the latch used for a use condition and the latch used for a storage state are provided in the support | pillar separately, this invention is not limited to this, The length of a support | pillar, Depending on the height to which the support is attached, the use state and the storage state can be shared by the hooks provided on each column. Moreover, in the above-mentioned embodiment, when the ladder is placed in the retracted state, the receiving part of the support tool comes into contact with the base part of the latching tool so that the support column is not damaged by the receiving part of the support tool. However, it is also possible to shorten the base of the latch so that the receiving part of the support comes into contact with the support. Further, in the above-described embodiment, the handrail is provided with a blind nut as a screw threaded portion. However, the present invention is not limited to this, and a well nut, an anchor plug, or the like may be provided. A screw threading portion may be formed by performing a burring tap process on the screw.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a ladder used for going to a loft or an attic.

DESCRIPTION OF SYMBOLS 1 Ladder 10 Support | pillar 11 Tread board side member 12 Handrail side member 13 Fitting groove part 14 Fitting edge part 15 Insertion hole 16 Upper end opening parts 17 and 18 Fitting hole 20 Upper end cap 22 Lid part 23 Tread board side insertion board part 24 Handrail side insertion plate portions 25, 26 Fitting convex portion 27 Lower end cap 28 Bottom plate portion 29 Insert plate portion 30 Leg end tool 31 Protruding portion 40 Tread plate 41 Screw hole 42 Tread plate cap 50 Handrail 51 Screw threaded portion 52 Hole 53 Blind nut 60 Bracket 61 Body portion 62 Handrail cap portion 63 Through-hole 64 Lid portion 65 Cylindrical plate portion 70 (70A, 70B) Latching tool 71 Base 72 Hook part 80 Support tool 81 Holding part 82 Receiving part 83 Fixing part 84 Extension part 85 Hanging part 90 Parting material 91 Recess 92 Receiving tool 93 Receiving plate 94 Hook insertion hole 95 Hook receiving part 100, 101, 102, 103 Screw

Claims (4)

A ladder comprising a pair of hollow columns, a plurality of treads laid between the pair of columns, and a hollow handrail provided on the columns,
The pair of struts includes a tread board side member that is arranged on the inside and the tread board is fixed, and a handrail side member that is arranged on the outside and the handrail is fixed.
Between the handrail side member and the handrail, a bracket for attaching the handrail to the handrail side member is provided,
The handrail includes a screw threaded portion into which a handrail fixing screw is threaded.
The handrail side member is provided with an insertion hole at a position corresponding to the screw threaded portion,
The bracket has a through hole formed at a position corresponding to the screw threaded portion and the insertion hole,
The handrail side member, the bracket, and the handrail are fixed by screwing the screw inserted into the insertion hole and the through hole from the inside of the handrail side member into the screw threaded portion. Ladder.   The ladder according to claim 1, wherein the bracket includes a handrail cap portion attached to an end portion of the handrail. An upper end cap is attached to the upper end opening of the column,
The upper end cap is provided with a tread board side insertion plate portion and a handrail side insertion plate portion inserted into the upper end opening,
The footboard side insertion plate portion is locked to the footboard side member, and the handrail side insertion plate portion is locked to the handrail side member, whereby the footboard side member and the handrail side member are fixed to the upper end cap. The ladder according to claim 1 or 2, characterized by the above-mentioned. A support for hanging the column is provided on the wall surface,
At the upper part of the support column is provided a hook that is hung on the support,
The hook includes a base portion that extends along the support column, and a hook portion that protrudes from the base portion.
The support includes a holding portion that hooks the hook portion, and a receiving portion that extends downward from the holding portion,
When the hook portion is hooked on the holding portion and the support column is suspended along the wall surface, the upper portion or the base portion of the support column contacts the receiving portion, and the lower end portion of the support column contacts the wall surface. The ladder according to any one of claims 1 to 3, wherein the ladder is not performed.

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