Alternated type staircase folded onto wall surface

Abstract

To enable footboards to be folded onto a wall surface of a building in an alternated type staircase.SOLUTION: An alternated type staircase folded onto a wall surface comprises: a fixed bridgeboard 11 fixed to a wall surface of a building; a movable side plate 12 facing the fixed bridgeboard 11 approximately in parallel therewith; an auxiliary support plate 13 fixed to an inside of the movable side plate 12 and supporting and hinged to side edges of footboards 14 so as to be freely rotatable; and a plurality of footboards 14 whose both side edges are hinged to the auxiliary support plate 13 and the fixed bridgeboard 11 so as to be freely rotatable. A pair of upper and lower footboards 14 are arranged on each horizontal step portion 11d of the fixed bridgeboard 11. The right or left half of the footboards 14 has tread surfaces, and the tread surfaces are arranged alternately to form an alternated type staircase. By rotating the movable side plate 12 toward the fixed bridgeboard 11, the footboards 14 and the movable side plate 12 overlap the fixed bridgeboard 11 side and are folded, and the whole is folded onto the wall surface so as to overlap in three layers.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a foldable staircase, for example for ascending and descending to a mezzanine or second floor of a building, which can be folded flat onto a first floor wall. [Background technology]

[0002] The inventor and applicant of the present application have previously obtained many design rights and patent rights relating to staggered staircases. This staggered staircase has each step with only half the tread surface of a normal staircase, and these half tread surfaces are arranged alternately left and right.

[0003] Each step (each tread) of this staggered staircase has only a left and right half of its tread surface, and the left and right tread surfaces of the upper and lower treads can be arranged to overlap by a specified front-to-rear width when viewed from above. In other words, even if the number of steps is the same as that of a normal staircase, the same number of steps can be installed at a steeper angle. In other words, a staggered staircase allows the stairs to be installed with a narrower front-to-back width. Here, the front-to-back width refers to the width in the front-to-back direction when climbing the staircase, and a staggered staircase can be set up with a shorter front-to-back width than a normal staircase if it has the same number of steps.

[0004] Conventional folding stairs for walls of buildings include those described in the following patent documents:

[0005] The folding staircase described in Patent Document 1 has an objective of being easy to fold and unfold, and also has a compact and attractive appearance when folded.

[0006] The solution to this problem consists of a fixed girders with an upper oblique side formed in a stepped shape and fixed to the wall surface, and a movable girders with a lower oblique side formed in a stepped shape and capable of rotating, with the horizontal parts of the stepped shapes connected to each other by multiple treads with hinges on both ends. In the folded state, the movable girders are lifted above the fixed girders and supported by the treads that stand vertically. Each tread fits into the space formed between the fixed girders and the movable girders, so that all the treads and the movable girders are in close contact with or in close proximity to the wall surface and are approximately flush with the fixed girders. When unfolded, the movable girders are rotated diagonally downwards, so that the lower end of the movable girders abuts against the floor surface and the unfolded state is reached, and all the treads are supported horizontally. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2020-84437 A Summary of the Invention [Problem to be solved by the invention]

[0008] In the above-mentioned conventional example, the treads are normal treads, that is, the tread surface is provided on the entire left and right sides, which differs from staggered stairs in that the tread surface is only half on either the left or right side. In the case of a staggered staircase, where the treads are the left and right halves, parts of the upper and lower treads are overlapped when viewed from above, and if this is placed over a fixed rafter, the treads will overlap, making it impossible to stack them in two layers as described in the above patent document.

[0009] Therefore, the objective of the present invention is to provide a wall-foldable staggered staircase in which the upper and lower treads have portions where they overlap when viewed in a plane, and which can be folded up so as to be folded against the wall of a building. [Means for solving the problem]

[0010] In order to solve the above problems, the first aspect of the present invention comprises a fixed girders fixed to the wall surface of a building, a movable side plate facing the fixed girders in a substantially parallel manner, an auxiliary support plate fixed to the inside of the movable side plate and supporting and hinged to the side edge of the tread plate so as to be freely rotatable, and a plurality of tread plates whose both side edges are hinged to the auxiliary support plate and the fixed girders so as to be freely rotatable. A pair of upper and lower tread plates are disposed on the horizontal step portion of each of the fixed girders, and the left and right halves of the tread plates are tread surfaces. the treads are arranged alternately to form a staggered staircase, one side edge of each of the upper and lower sets of treads is pivotally hinged to the fixed support beam and the other side edge is pivotally hinged to an auxiliary support plate of the movable side plate, and the treads and the movable side plate are folded so as to overlap the fixed support beam side by pivoting the movable side plate so as to lift it obliquely upward toward the fixed support beam, and the entire staircase is folded so as to overlap in three layers against the wall of the building. Wall-mounted staircase It is.

[0011] The second aspect of the present invention is a wall-facing folded staggered staircase according to the first invention, characterized in that the fixed rafters, the treads, and the auxiliary support plates have the same thickness.

[0012] The third aspect of the present invention is a wall-folded staggered staircase according to the first or second invention, characterized in that a pair of upper and lower treads are provided on the horizontal step of the fixed slat, with the tread surface of the lower tread on the right side and the tread surface of the upper tread on the left side.

[0013] The fourth aspect of the present invention is a wall-mounted folded staggered staircase according to the first or second invention, characterized in that the auxiliary support plate has a vertical length that is approximately the same as the distance between the upper and lower treads, and the front-to-back length of its upper edge or lower edge is approximately the same as the front-to-back length of the upper and lower treads in a plan view.

[0014] A fifth aspect of the present invention is a wall-facing folded staggered staircase according to the first or second invention, characterized in that the width of the tread is less than twice the rise width of the tread.

[0015] The sixth aspect of the present invention is a wall-facing folded staggered staircase according to the first or second invention, characterized in that the auxiliary support plate is folded over onto the wall and positioned in the same second layer as the lower tread of a pair of upper and lower treads provided on the flat step portion of the fixed truss beam. Effect of the Invention

[0016] In the first aspect of the present invention, the present invention comprises a fixed support beam fixed to the wall surface of a building, a movable side plate facing the fixed support beam and approximately parallel to the fixed support beam, an auxiliary support plate fixed to the inside of the movable side plate and supporting and hinged to the side edge of the tread plate so as to be freely rotatable, and a plurality of tread plates each having both side edges hinged to the auxiliary support plate and the fixed support beam so as to be freely rotatable. A pair of upper and lower tread plates are disposed on the horizontal step portion of each of the fixed support beams, and the left and right halves of these tread plates have tread surfaces, The treads are arranged in a staggered manner to form a staggered staircase, and one side edge of each of the upper and lower sets of treads is rotatably hinged to the fixed truss and the other side edge is rotatably hinged to the auxiliary support plate of the movable side panel, and by rotating the movable side panel so as to lift it diagonally upward toward the fixed truss, the treads and movable side panel are folded so as to overlap the fixed truss, and the entire structure is folded so as to overlap in three layers against the wall of the building.

[0017] In other words, in the present invention, the treads themselves are not normal treads, but rather the staggered staircase has a tread surface that is only half as large, so the upper tread of a pair of upper and lower treads is installed on the horizontal step of the fixed truss beam, and the upper tread is folded toward the fixed truss beam so that the two treads overlap on the same surface. Next, the lower step of the pair of upper and lower step boards is folded so as to overlap the upper step board to form the second layer. The auxiliary support plate attached to the movable side plate side of this second layer of treads is hinged to the upper and lower set of treads, with the upper tread being folded over onto the fixed truss side to form the same first layer, and the lower tread being further folded over on top of the upper tread to form the second layer. At the same time that the second layer is laid, the movable side plate to which the auxiliary support plate is joined and fixed is also laid as the third layer.

[0018] In this way, in the wall-mounted staggered staircase of the present invention, the upper tread of a set of staggered stairs installed on each horizontal step of the fixed rafter closest to the wall constitutes the first layer, the lower tread of the set of staggered stairs and the auxiliary support plate to which this tread is hinged constitute the second layer, and the movable side plate is stacked on the outside of that as the third layer, and the two are folded together into a flat surface.

[0019] In the second aspect of the present invention, a further limitation is added to the first invention, and the first and second layers are appropriately overlapped by specifying that the plate thicknesses of the fixed brace, the tread, and the auxiliary support plate are the same.

[0020] The third aspect of the present invention is similar to the above-mentioned invention, but with a limitation added, in which the step of the first tread of the staggered staircase is disposed on the right side.

[0021] In the fourth aspect of the present invention, which is further limited in the same manner as the above-mentioned invention, the auxiliary support plate has a vertical length that is approximately the same as the distance between the upper and lower treads, and the front-to-back length of its upper edge or lower edge is approximately the same as the front-to-back length of the upper and lower treads in a plan view. It is designed to be folded appropriately.

[0022] In the fifth aspect of the present invention, similarly to the above, limitations are added to the above invention, and the width of the tread is specified to be not more than twice the rise width of the tread. This allows the staggered staircase of the present invention to be folded properly.

[0023] The sixth aspect of the present invention is also a limitation of the above invention, and clarifies that the auxiliary support plate is folded over the wall surface and positioned in the same second layer as the lower tread of the upper and lower pair of treads provided on the flat step portion of the fixed braced beam. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is an overall explanatory diagram showing one embodiment of a wall-mounted staggered staircase according to the present invention, illustrating the state in which it has been pulled out from the wall and is ready for use. [Diagram 2] The figure shows a state in which the movable side plate according to the above embodiment is about to be rotated obliquely upward and folded over against the wall surface. [Diagram 3] FIG. 2 is an explanatory diagram showing a pair of upper and lower step boards at the lowest level according to the embodiment, as viewed from above. [Figure 4] This is an explanatory diagram showing the bottom four steps of the upper and lower treads related to the above-mentioned embodiment, and is an explanatory diagram viewed from the fixed truss beam side with the fixed truss beam separated from the wall surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall explanatory diagram showing one embodiment of a wall-mounted staircase according to the present invention, illustrating the state in which it has been pulled out from the wall and is ready for use.

[0026] The wall-surface folded staggered staircase of the present invention comprises a fixed support beam 11 fixed to a wall surface W, a movable side panel 12 facing the fixed support beam 11 and approximately parallel to it, an auxiliary support plate 13 joined and fixed to the inside of the movable side panel 12, and a tread 14 whose both side edges are hinged to the auxiliary support plate 13 and the fixed support beam 11 so as to be freely rotatable.

[0027] The fixed beam 11 is provided with a plurality of horizontal steps 11d in a stepped manner (four steps in this embodiment), and a pair (two pieces) of treads 14 are disposed on each of the horizontal steps 11d. In a normal staircase, rather than the staggered staircase of the present invention, a single tread would be provided at this horizontal step 11d, but in the case of the staggered staircase of the present invention, a pair (two) of treads 14, 14, one above and one below, are arranged at this horizontal step 11d with their tread surfaces alternating left and right.

[0028] The further difference from conventional folding stairs is the configuration of the movable side panel 11. In other words, in the case of conventional folding staircases, a rafter with an opposite configuration to the fixed rafter was used, with a step portion provided on the hypotenuse of the lower side of the movable side panel, and a configuration was adopted in which the treads attached between the horizontal steps of the fixed rafter and movable rafter could be folded up against the wall surface.

[0029] However, in the case of the staggered staircase of the present invention, the distance between the top and bottom of the horizontal step portion 11d on the side of the fixed truss beam 11 is set to the distance between the top and bottom of two treads 14, in other words, approximately twice the height of the riser, and the configuration on the side of the movable side panel 12 has been improved.

[0030] The improvement on the movable side plate 12 is the presence of an auxiliary support plate 13. The structure of this auxiliary support plate 13 will be explained in detail later in Figures 3 and 4, but it is a plate material of the same thickness as the tread 14 joined and fixed to the inside of the movable side plate 12, and has a vertical length approximately equal to the spacing between a pair of upper and lower staggered treads 14, 14 arranged in the horizontal step portion 11d of the fixed slat 11, and its upper edge is hinged so as to be freely rotatable to the side edge of the movable side plate 12 of the upper tread 14 of the set of treads 14, and its lower edge is hinged so as to be freely rotatable to the side edge of the movable side plate 12 of the lower tread 14 of the set of treads 14.

[0031] In this embodiment, eight treads 13 are provided in total. The fixed crossbeam 11 is provided with four horizontal steps 11d, and a pair (two pieces) of staggered treads 14 are arranged on each of the horizontal steps 11d. Therefore, the configuration of each horizontal step portion 11d is the same, and the folded configuration is also the same.

[0032] In other words, the vertical length of the auxiliary support plate 13 is approximately the same as the spacing between the pair of upper and lower treads 14, and the upper edge 13u of this auxiliary support plate 13 is hinged so as to be able to rotate freely to the upper tread 14, and the lower edge 13s of this auxiliary support plate 13 is hinged so as to be able to rotate freely to the lower tread 14.

[0033] As a result, by rotating the movable side plate 12 upward, the upper step 14 of the set of steps 14 moves onto the horizontal step portion 11d of the fixed support beam 11 and joins with the wall surface W. In other words, it becomes flush with the fixed support beam 11. On the other hand, the auxiliary support plate 13 and a pair of lower treads 14s rotatably hinged to its lower edge are superimposed on the upper treads 14u to form the second layer.

[0034] FIG. 2 illustrates a state in which the movable side plate according to the above embodiment is about to be rotated obliquely upward and folded over against the wall surface.

[0035] As described above, a pair of upper and lower treads 14u and 14s are arranged on the horizontal step portion 11d of the fixed crossbeam 11, forming a staggered staircase. The configuration of each horizontal step 11d is the same, and in this embodiment, four horizontal steps 11d are formed. Each horizontal step 11d is formed with a pair of upper and lower treads 14u and 14s, and the tread surfaces of these treads 14u and 14s are arranged alternately left and right to form a staggered staircase.

[0036] As described above, by rotating the movable side plate 12 obliquely upward, the upper step 14u of the pair of steps 14 provided on each horizontal step 11d moves onto the horizontal step 11d of the fixed support beam 11 and joins with the wall surface W. In other words, it becomes flush with the fixed support beam 11. On the other hand, the auxiliary support plate 13 and the pair of upper and lower step plates 14s rotatably hinged to the lower edge of the auxiliary support plate 13 are superimposed on the upper step plate 14u.

[0037] In other words, in the folded staggered staircase of the present invention, when folded, the fixed crossbeam 11 on the wall surface W side and the upper tread 14u hinged so as to be freely rotatable to the upper edge of each horizontal step 11d are flush with each other to form the first floor.

[0038] Next, the auxiliary support plate 13 which is joined and fixed to the inside of the movable side plate 12 and the lower step plate 14s which is hinged so as to be rotatable to the lower edge of the auxiliary support plate 13 are folded over the upper step plate 14u to form the second layer. The third layer constitutes the movable side plate 13 with the auxiliary support plate 13 joined and fixed inside.

[0039] In this way, the staggered folded staircase of the present invention is folded in three layers as a whole.

[0040] FIG. 3 is an explanatory diagram of a pair of upper and lower step boards at the lowest level according to the embodiment, as viewed from above. FIG. 4 is an explanatory diagram similarly showing the bottom four steps of the upper and lower treads, and is an explanatory diagram viewed from the fixed truss beam side with the fixed truss beam separated from the wall surface. The auxiliary support plate will be described in detail with reference to these figures.

[0041] As can be seen from these figures, the vertical height of the auxiliary support plate 13 is approximately equal to the distance between the upper step 14u and the lower step 14s, and its upper edge 13u is hinged so as to be freely rotatable to the side edge of the upper step 14u, and its lower edge 13s is hinged so as to be freely rotatable to the side edge of the lower step 14s.

[0042] The front-to-rear length of the upper edge 13u of the auxiliary support plate 13 is formed to be approximately equal to the front-to-rear length of the side edge of the upper step 14u, and the front-to-rear length of the lower edge 13s of the auxiliary support plate 13 is formed to be approximately equal to the front-to-rear length of the side edge of the lower step 14s. Therefore, the external shape of the auxiliary support plate 13 does not necessarily have to be rectangular, and may be a trapezoid with a vertical rear side.

[0043] With the above configuration, when the movable side plate 12 is folded over onto the fixed girders 11, the upper treads 14u provided on each horizontal step 11d rotate onto the horizontal step 11d and join to the wall surface, and the lower treads 14s and the auxiliary support plate 13 are folded over so as to be flush with each other on the same plane and overlap the upper treads 14u. In other words, the lower treads 14s and the auxiliary support plate 13 form the second intermediate layer. The movable side panel 12 constitutes the third layer on the outside, and the staggered staircase of the present invention is folded onto the wall surface in a flat manner as three layers.

[0044] In the above explanation, the word "hinged" was used to describe how the tread 14 is rotatably connected to the fixed support beam 11 and the auxiliary support plate 13, but this "hinged" means that it is rotatably connected using a hinge, and the hinge can be installed in any manner.

[0045] Also, with regard to the tread surface of the step 14, in the above embodiment the tread surface is disposed on the right side of the first step of the lowest step, but it is also possible to implement the embodiment with the tread surface of the lowest step 14s on the left side.

[0046] As described above, one embodiment of the present invention has been described. However, in the present invention, the form can be modified in various ways as described below.

[0047] First of all, the number of steps is completely up to you and does not have to be an even number. This is because in the above embodiment, the top step can be eliminated and the height of the horizontal step portion can be set to the height of one riser.

[0048] The length of each step from side to side must be no more than two riser heights, because if it is more than two riser heights, it will not be possible to fold it over.

[0049] The thickness of the fixed beam, the treads and the secondary support plates must be the same to ensure proper folding.

[0050] The alternating tread surfaces of each step may begin on either the left or right side at its lowest step.

[0051] By forming a recess in the wall surface and fitting a fixed rafter into the recess, the staggered staircase of the present invention appears as a two-story structure, with a second story from the wall surface and a third story made of movable side panels. Similarly, if the second layer is also fitted into the recess, the appearance of the folded structure will consist of only the movable side panel of the third layer, giving it an extremely smart appearance.

[0052] The above-mentioned staggered staircase may optionally have handles on the outer surfaces of the movable side panels. This makes it easier to fold and stack the movable side panels and the internal treads.

[0053] Furthermore, by providing a motion control device such as a gas spring at an appropriate position, the movement of the staggered stairs can be made gentler.

[0054] Finally, it is optional to provide locking means by which the staggered folding staircase according to the invention can be folded up against a wall and fixed to that side.

[0055] As described above, in the present invention, unlike conventional folding normal stairs, a wall-folding staggered staircase in which each step has a staggered tread surface can be appropriately folded onto the wall of a building. [Explanation of symbols]

[0056] 11 Fixed sash beam 11d Horizontal step 12 Movable side plate 13 Auxiliary maintenance plate 13u Upper edge (of auxiliary support plate) 13s Lower edge (of auxiliary support plate) 14, 14u, 14s treadle

Claims

1. The structure comprises a fixed support beam that is fixed to the wall surface of a building, a movable side plate that faces the fixed support beam and is substantially parallel to the fixed support beam, an auxiliary support plate that is fixed to the inside of the movable side plate and rotatably supports and hinges the side edges of the treads, and a plurality of treads whose both side edges are rotatably hinged to the auxiliary support plate and the fixed support beam, A pair of upper and lower treads are provided on each horizontal step of the fixed slats, The left and right halves of these steps have tread surfaces, and the tread surfaces are arranged alternately to form a staggered staircase, Each of the pair of upper and lower treads has one side edge pivotally hinged to the fixed support beam and the other side edge pivotally hinged to an auxiliary support plate of the movable side plate; This wall-surface folding staggered staircase is characterized in that the tread and the movable side plate are folded so as to overlap the fixed truss by rotating the movable side plate so as to lift it obliquely upward toward the fixed truss, and the whole of the staircase is folded so as to overlap in three layers on the wall surface of the building.

2. The wall-mounted staircase according to claim 1, characterized in that the plate thicknesses of the fixed support beam, the tread, and the auxiliary support plate are the same.

3. The wall-folded staggered staircase according to claim 1 or 2, characterized in that in a pair of upper and lower treads provided on the horizontal step portion of the fixed slat, the tread surface of the lower tread is positioned on the right side and the tread surface of the upper tread is positioned on the left side.

4. The wall-mounted staircase as described in claim 1 or 2, characterized in that the vertical length of the auxiliary support plate is approximately the same as the distance between the upper and lower treads, and the front-to-back length of its upper edge or lower edge is approximately the same as the front-to-back length of the upper and lower treads in a plan view.

5. 3. The wall-facing staggered staircase according to claim 1, wherein the width of the tread is less than twice the width of the riser of the tread.

6. The wall-mounted staggered staircase described in claim 1 or 2, characterized in that the auxiliary support plate is folded over the wall surface and positioned in the same second layer as the lower tread of a pair of upper and lower treads provided on the flat step portion of the fixed slat.

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