JP2014047526A - Indoor staircase, and stair tread fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indoor staircase capable of ensuring an attractive appearance and sufficient tread fitting strength.SOLUTION: The present invention relates to an indoor staircase in which a tread 3 is supported by a bridgeboard 2 through a tread fixture 4. An assembly groove 26 is formed at a fitting position of the tread fixture 4 on an upper surface of the bridgeboard 2. The tread fixture 4 comprises: a tread backing plate 5, which is roughly horizontally placed; and an inside downward piece 61 and an outside downward piece 65, which extend downward from the tread backing plate 5 and face each other. The tread backing plate 5 is fixed on an underside of the tread 3 through a tread fastening tool 11. The inside downward piece 61 is placed along an inside surface 23 of the bridgeboard 2, while the inside downward piece 61 is fixed on the inside surface 23 of the bridgeboard 2 through a beam fixing tool 13 with the outside downward piece 65 inserted into the assembly groove 26.

Description

  The present invention relates to an indoor staircase and a step plate fixing metal fitting in which a step plate is fixed to a saddle girder via a fixing metal fitting.

  Open staircases are well known as wooden indoor staircases for ordinary houses. In the open staircase, a plurality of step plates are generally fixed to a pair of ridges extending obliquely upward via step plate fixing brackets at predetermined intervals.

  For example, in the open stairs for indoor use shown in Patent Document 1 below, a downward U-shaped step plate fixing bracket is fixed to both sides of the lower surface of the step plate, and the step plate fixing bracket is placed in the U-shaped groove. And the both side pieces of the U-shaped fixture are fixed to the spar, thereby fixing the step plate to the spar through the fixture.

  The open stairs shown in Patent Documents 2 to 4 have a horizontal piece of an L-shaped plate fixing bracket fixed to both sides of the lower surface of the plate, and a vertical piece of the plate fixing bracket is attached to the inner surface of the spar. By fixing, the corrugated board is fixed to the spar.

Japanese Patent No. 4525466 Japanese Patent No. 4631577 JP 2008-184811 A JP 2010-24774 A

  However, as shown in Patent Document 1, in an open stair using a U-shaped step plate fixing bracket, both side pieces of the step plate fixing bracket are arranged on both side surfaces of the saddle girder. There is a problem that the placed piece is visually recognized from the side of the staircase and it is difficult to ensure a good aesthetic appearance.

  On the other hand, as shown in Patent Documents 2 to 4, in an open staircase using an L-shaped fixing bracket, the fixing bracket is arranged on the inner side surface of the further girder. A beautiful aesthetic can be secured. However, since the L-shaped fixing bracket is supported only on one side (inner side) of the sagittal girder, it becomes a so-called cantilever structure, and it may be difficult to ensure sufficient mounting strength of the corrugated board. There was a problem that there was.

  The present invention has been made in view of the above problems, and an object thereof is to provide an indoor staircase and a corrugated plate fixing bracket that can sufficiently secure the mounting strength of the corrugated plate while ensuring a good aesthetic appearance. And

  In order to solve the above problems, the present invention comprises the following means.

[1] An indoor staircase in which a step plate is supported via a step plate fixing bracket on a saddle girder extending obliquely upward,
While the mounting groove is formed at the mounting position of the corrugated plate fixing bracket on the upper side of the sagittal girder,
The corrugated plate fixing bracket includes a corrugated plate receiving plate that is disposed substantially horizontally, an inner downward piece and an outer downward piece that extend downward from the corrugated plate receiving plate and are opposed to each other.
The step plate receiving plate is fixed to the lower surface of the step plate via a step plate fixing tool,
The inner downward piece is arranged along the inner surface of the spar and the inner downward part is inserted into the assembling groove, and the inner downward slid Indoor staircase characterized by being fixed to the side.

  [2] The indoor staircase according to the preceding item 1, wherein the inner downward piece and the outer downward piece are connected and fixed to each other by at least two connecting tools penetrating the inner portion of the spar.

[3] A handrail is provided upright on a side edge of the corrugated board, and a handrail with a headboard fixed to an upper end of the handrail,
While a handrail fixing hole is formed in a side edge portion of the step plate receiving plate in the step plate fixing bracket,
The indoor staircase according to the preceding item 1 or 2, wherein the handrail is fixed to the handrail fixing hole by a handrail fixing tool in a state where a lower end portion of the handrail is disposed so as to penetrate a side edge portion of the corrugated board.

[4] A corrugated plate fixing bracket used when supporting the corrugated plate to a saddle girder extending obliquely upward,
A corrugated plate receiving plate that can be disposed on the back side of the corrugated plate;
When the corrugated plate receiving plate is disposed substantially horizontally, an inner downward piece and an outer downward piece that extend downward from the corrugated plate receiving plate and are arranged in parallel to face each other,
A step plate mounting through hole for fixing the step plate receiving plate to the back side of the step plate is formed in the step plate receiving plate,
A through hole for attaching a girder is formed in the inner downward piece to fix the inner downward piece to the inner side of the further girder,
A corrugated board fixing bracket, wherein the outer downward-facing piece can be inserted into an assembling groove provided on the upper side surface of the further beam.

  According to the indoor staircase of the invention [1], the step plate fixing bracket for supporting the step plate to the reed girder fixes the inner downward piece to the inner side surface of the reinforcer girder and attaches the outer downward piece to the reed girder. Because it is inserted into the groove, even if you look into the indoor staircase from the side, the stepping plate fixing brackets such as the inner downward pieces and the outer downward pieces are not visible, ensuring a good aesthetic it can. Furthermore, since the inner downward piece is fixed to the inner surface of the sheathing girder, the outer downward piece can also be fixed to the sheathing girder. Sufficient mounting strength can be obtained.

  According to the indoor staircase of the invention [2], since the two downward pieces of the step plate fixing metal are connected and fixed to each other by the connecting tool, it is possible to further improve the mounting strength of the step plate fixing metal, and hence the step plate. it can.

  According to the indoor staircase of the invention [3], since the step board fixing bracket is also used as a bracket for attaching a handrail of a handrail, the number of parts can be reduced and the staircase construction work can be performed more efficiently. be able to.

  According to the step plate fixing metal fitting of the invention [4], the step plate can be attached with sufficient strength while ensuring a good aesthetic appearance as described above.

FIG. 1 is a partially exploded perspective view of a wooden indoor staircase according to an embodiment of the present invention with a handrail removed. FIG. 2 is a side sectional view showing the indoor staircase of the embodiment. FIG. 3 is a front sectional view showing the indoor staircase of the embodiment. FIG. 4 is an enlarged side cross-sectional view showing the periphery of the step board in the indoor staircase of the embodiment. FIG. 5 is an enlarged front sectional view showing the periphery of the step board in the indoor staircase of the embodiment. FIG. 6 is a perspective view showing a corrugated board fixing bracket used for the indoor staircase of the embodiment. FIG. 7 is a view showing the step board fixing metal fitting according to the embodiment, in which FIG. (A) is a front view, FIG. (B) is an inner side view, FIG. (C) is an outer side view, and FIG. It is. FIG. 8 is a diagram showing a handrail applied to the indoor staircase of the embodiment, in which FIG. 8 (a) is a front view and FIG. 8 (b) is a side view.

  1 is a partially exploded perspective view of a wooden indoor staircase according to an embodiment of the present invention with a handrail removed, FIG. 2 is a side sectional view, and FIG. 3 is a front sectional view. In the following description, the direction going up the stairs (right direction in FIG. 2) is assumed to be “front”, and the direction going down the stairs (left direction in FIG. 2) is assumed to be “rear”. To do.

  As shown in these figures, the indoor staircase of the present embodiment constitutes an open staircase that is open on one side, and one side edge (wall side edge) is arranged along the indoor wall surface, And the staircase main body 1 with which the edge part (open side edge part) of the other side was open | released, and the handrail 7 provided in the open side edge part of the staircase main body 1 are provided.

  The staircase body 1 includes a pair of spar 2 and 2, a plurality of step plates 3 arranged on the pair of spar 2 and 2 at predetermined intervals, and each step plate 3 as a pair of spar 2 and 2. And a corrugated plate fixing bracket 4 for fixing to the base plate as basic components.

  The pair of spar girders 2 and 2 are fixed to the structural material of the house in a state where they are arranged in parallel to each other at an interval in the left-right direction (step width direction) and obliquely upward. Needless to say, the girders 2 and 2 are arranged at an inclination angle corresponding to the inclination angle (gradient) of the indoor staircase to be assembled.

  As shown in FIG. 3 and the like, the spar 2 is formed in a rectangular shape having a vertically long cross section having an upper side surface 21, a lower side surface 22, an inner side surface 23, and an outer side surface 24. A chamfer 25 is formed between the two.

  An assembly groove 26 extending continuously along the length direction of the sheath beam 2 is formed at a position slightly closer to the outer surface 24 from the intermediate position on the upper surface 21 of the sheath beam 2.

  In the present embodiment, the scabbard 2 is constituted by a material provided with a decorative material on the surface of a core material made of, for example, plywood, laminated material, solid material, or the like.

  In addition, the thickness between the inner side surface 23 and the outer side surface 24 is 50 mm to 100 mm, the width between the upper side surface 21 and the lower side surface 22 is 100 mm to 300 mm, and the length is 2000 mm to 4500 mm. A thing can be used conveniently.

  In the present embodiment, the pair of spar girders 2 are symmetrical to each other.

  As shown in FIGS. 1-5, in this embodiment, the corrugated board 3 is comprised by what provided the decorative material on the surface of the core material which consists of a plywood, a laminated material, a solid material etc., for example.

  The step board 3 preferably has a thickness of 30 mm to 60 mm, a width corresponding to the front-rear dimension (depth dimension) of 200 mm to 300 mm, and a length corresponding to the step width dimension of 800 mm to 1200 mm in the stair assembly state. Can be used.

  As shown in FIGS. 4 and 5, in the present embodiment, mounting concave portions 34 for mounting the step plate receiving plate 5 of the step plate fixing bracket 4, which will be described in detail later, are formed on both sides of the rear surface side of the step plate 3. Has been. Further, handrail mounting bolt holes 32 penetrating the front and back are formed in the open side edge of the step plate 3.

  As shown in FIG. 6 and FIG. 7, the step plate fixing bracket 4 is provided on a substantially square step plate receiving plate 5 and a lower surface side of the step plate receiving plate 5 and extends downward to face each other. Plate-like inner downward pieces 61 and outer downward pieces 65 arranged in parallel with each other.

  In the present embodiment, the corrugated plate fixture 4 is formed by combining two metal members. That is, one metal member constitutes the corrugated plate receiving plate 5 and is constituted by a flat metal plate. Slits 50 and 50 are formed at positions corresponding to the two downward pieces 61 and 65 in the stepped plate receiving plate 5.

  The other metal member is constituted by a downward U-shaped metal molding plate 6 having an inner downward piece 61, an outer downward piece 65, and a connecting piece for connecting the upper ends of both downward pieces 61, 65. Has been. Both downward pieces 61 and 65 of the U-shaped molded plate 6 are inserted into both slits 50 and 50 of the stepped plate receiving piece 5 from the upper surface side, and the connecting piece of the U-shaped formed plate 6 is a stepped plate fixing plate. By welding to 5, the corrugated plate fixing bracket 4 is formed.

  Step plate mounting screw holes 51 are formed at the four corners of the step plate receiving plate 5 in the step plate fixing bracket 4, and handrail mounting bolt holes 52 are provided at intermediate positions of predetermined sides of the four sides. Is formed.

  In addition, the side part in the side in which the handrail attachment bolt hole 52 is formed in the step board receiving plate 5 is arranged on the outer side, that is, the open side edge part in the stair assembly state.

  Further, in this embodiment, the step plate mounting screw hole 51 constitutes a step plate mounting through hole.

  The inner downward piece 61 and the outer downward piece 65 in the step plate fixing bracket 4 are arranged so as to extend obliquely forward and downward in a state where the step plate receiving plate 5 is held horizontally. The lower edge of the outer downward piece 65 is notched obliquely upward so as to correspond to the inclination (gradient) of the indoor staircase, and can be inserted into the assembly groove 26 of the spar 2 in the stair assembly state. Yes. Further, on both sides of the lower end portion of the outer downward piece 65, connection threading holes 66, 66 in which thread grooves (internal threads) are formed are formed.

  The lower end edge of the inner downward piece 61 is formed to be parallel to the corrugated plate receiving plate 5. At the lower end portion of the inner downward piece 61, connection bolt holes 62, 62 are formed corresponding to the connection threading holes 66, 66 of the outer downward piece 65. Further, two girder mounting screw holes 63, 63 are formed on the front side of the lower end portion of the inner downward piece 61 so as to be arranged in the front-rear direction.

  In the present embodiment, the corrugated plate fixing bracket 4 is fixed to both sides of the lower surface of the corrugated plate 3 as described below, but the corrugated plate fixing bracket 4 fixed to the right side of the corrugated plate 3 is used. And the corrugated board fixing metal fitting 4 fixed to the left side is a symmetrical shape.

  Further, in the present embodiment, the connecting bolt hole 62 of the inner downward piece 61 and the connecting threaded hole 66 of the outer downward piece 65 constitute a connecting through hole.

  Using the corrugated plate fixing bracket 4 having the above-described configuration, the corrugated plates 3 are fixed to a pair of ridges 2 and 2 as described below. In the following description, the corrugated plate fixing bracket 4 is attached to the corrugated plate 3, and then the corrugated plate 3 with the fixing bracket is fixed to the further beam 2. However, the assembly procedure is limited in the present invention. For example, the step plate fixing metal fitting 4 may be fixed to the spar 2 and the step plate 3 may be fixed to the fixing metal fitting 4.

  First, the step plate fixing brackets 4 and 4 are respectively fixed to the left and right sides of the lower surface of the step plate 3 to be constructed. That is, the step plate receiving plate 5 of the step plate fixing metal fitting 4 is disposed so as to be accommodated in the mounting recess 34 on the lower surface of the step plate 3, and in this state, the screw holes 51 provided at the four corners of the step plate receiving plate 5 are provided. Then, a screw 11 configured as a step plate fixing tool is inserted and screwed into the step plate 3 to be fixed. Accordingly, the step plate fixing brackets 4 and 4 are fixed to both sides of the lower surface of the step plate 3, respectively. In this state, since the step plate receiving plate 5 of the step plate fixing bracket 4 is accommodated in the mounting recess 34 of the step plate 3, the lower surface of the step plate receiving plate 5 and the lower surface of the step plate 3 are flush with each other. It is configured to be placed inside.

  In the step plate fixing bracket 4 fixed to the step plate 3 in this manner, the outer downward piece 65 corresponds to the assembly groove 26 of the saddle beam 2, and the inner downward piece 61 corresponds to the inner surface 23 of the balance beam 2. The outer downward piece 65 is disposed outside the inner downward piece 61.

  The plurality of step plates 3 with the step plate fixing metal fittings 4 are fixed to the pair of spar girders 2 and 2 at predetermined intervals. In other words, the inner downward piece 61 of the corrugated plate fixture 4 is placed along the inner side surface 23 of the cage girder 2, and the outer downward piece 65 is inserted into the assembly groove 26 of the cage girder 2.

  As shown in FIG. 3, between the inner side surface 23 and the mounting groove 26 in the spar 2, the bolt holes 62 and the threaded holes 66 in the two downwardly facing pieces 61 and 65 of the step plate fixing bracket 4 are corresponded. A bolt insertion hole 27 is formed. When the bolt hole 62 and the threaded hole 66 of the corrugated plate fixing bracket 4 are disposed facing the bolt insertion hole 27, the corrugated plate receiving plate 5 is disposed horizontally, and the corrugated plate receiving plate 5 The step plate 3 fixed to is also arranged horizontally.

  In this state, the bolts 12 and 12 are respectively inserted into the two connecting bolt holes 62 and 62 of the inner downward piece 61 from the inner side surface, and further inserted into the bolt insertion holes 27 and 27 of the further beam 2. It is fixed by screwing into the connecting threading holes 66 of the outer downwardly facing piece 65, respectively. As a result, the two downward facing pieces 61 and 65 are connected to each other through the bolts 12 and 12 at two positions, so that the step plate fixing bracket 4, that is, the step plate 3 is prevented from rotating with respect to the spar 2. To maintain a predetermined mounting angle.

  Further, screws 13 and 13 are inserted into the two girder mounting screw holes 63 and 63 of the inner downward piece 61 from the inner side surface and screwed into the spar 2 to be fixed. Thereby, the step plate 3 together with the step plate fixing metal fitting 4 is firmly fixed to the spar 2. It should be noted that the screwing of the inner downward piece 61 to the further spar 2 may be performed before the two downward pieces 61 and 65 are connected by the bolt 12. That is, after the inner downward pieces 61 are fixed to the spar 2 by the screws 13, both the downward pieces 61 and 65 may be connected by the bolts 12.

  Needless to say, in the present embodiment, the step plate 3 is fixed to the pair of spar girders 2 and 2 via the step plate fixing brackets 4 and 4 at two positions on both sides.

  Here, in the present embodiment, the bolts 12 for connecting the downwardly facing pieces 61 and 65 in the corrugated plate fixture 4 constitute a connector. Further, a screw 13 for fixing the inner downward piece 61 to the further spar 2 constitutes a girder fixing tool.

  Similarly, the staircase body 1 is assembled by fixing a plurality of step plates 3 to the pair of slats 2 and 2 at predetermined intervals.

  On the other hand, as shown in FIGS. 2 and 3, the handrail 7 assembled to the open side edge of the staircase body 1 includes a plurality of handrails (vertical members) 71 constituted by square pipes, and the upper end of the handrail 71. It is provided with a coping (Yokogi) 75 to be attached.

  As shown in FIGS. 8 (a) and 8 (b), the handrail 71 is formed in a horizontally-long rectangular shape in horizontal section, and a horizontally-long rectangular pedestal 72 in plan view is fixed to the lower end portion. Yes. Further, at the lower end of the handrail 71, the upper side of the round pipe-shaped bar nut 73 is fixed, so that the lower side of the bar nut 73 protrudes downward.

  In the present embodiment, a handrail 71 having a rectangular cross section is used. Needless to say, the shape and size of the cross section of the handrail 71 are appropriately determined in consideration of strength, design, and the like. Set it. For example, the cross section of the handrail 71 may be formed into a quadrilateral other than a rectangle, a triangle, a polygon having five or more corners, a circle, an ellipse, an oval, or the like.

  The bar nut 73 of the handrail 71 having this structure is inserted into the handrail mounting bolt hole 32 of the step plate 3 from the upper surface side, and the pedestal 72 is placed on the upper surface of the step plate 3 and the bar nut 73 is inserted. The end on the side is arranged corresponding to the handrail mounting bolt hole 52 of the fixing bracket 4. Further, a bolt 74 is inserted into the handrail mounting bolt hole 52 of the fixing bracket 4 from the lower surface side and screwed into the bar nut 73 of the handrail 71, and the screws 16 are passed through the four corners of the pedestal 72 and screwed into the corrugated plate 3. It is. As a result, the handrail 71 is fixed in a state where it rises perpendicularly to the open side edge of the step board 3.

  Similarly, each handrail 71 is fixed to the open side edge of each step board 3 in a rising manner.

  Further, the handrail 71 fixed to the first stage plate 3 constitutes a main pillar, and the main pillar and the second stage plate 3 are connected by an L-shaped handrail connection fitting 78. It is fixed.

  That is, as shown in FIG. 1, the vertical piece of the balustrade coupling fitting 78 is fixed to the lower end rear surface side (lower end front surface side) of the first-stage balustrade 71 constituting the main pillar by screwing, and horizontally The piece is fixed to the back side of the second step plate 3 by screwing. In the present embodiment, in the second stage plate 3, the screw 11 that fixes the fixing bracket 4 to the step plate 3 is also used as the screw that fixes the handrail connection bracket 78 to the step plate 3. Yes.

  Furthermore, the decorative member 79 is fixed to the front surface side (rear surface side) of the handrail 71 constituting the main pillar by screwing.

  Further, the headboard 75 is fixed to the upper end portion of each balustrade 71 in a state of being arranged along the upper end portions of the plural balustrades 71.

  Furthermore, the auxiliary crosspiece 77 is fixed to the intermediate portion of each balustrade 71 in a state of being arranged along the intermediate portion of the plural balustrades 71.

  In the indoor staircase of the present embodiment assembled in this way, in the step plate fixing bracket 4 for supporting the step plate 3 to the sheathing girder 2, the outer downwardly facing piece 65 is inserted into the assembly groove 26 of the sheathing girder 2, Since the inner downward pieces 61 are arranged along the inner surface of the spar girder 2, even if the indoor staircase is looked into from the side, the step board fixing brackets 4 such as the inner downward pieces 61 and the outer downward pieces 65 are visible. Therefore, a good aesthetic can be ensured.

  In the present embodiment, the corrugated plate fixing bracket 4 includes two downward pieces, that is, an inner downward piece 61 and an outer downward piece 65, and both the downward pieces 61, 65 are fixed to the cage girder 2, whereby the step plate 3 Can be supported at two locations of the shearing girder 2 via the corrugated plate fixing bracket 4, so that the stepped plate 3 can be supported by the soaring beam 2 with a so-called both-end supported structure. For this reason, the indoor staircase of the present embodiment supports the step board with the cantilever structure only on the inner surface of the saddle girder, that is, only on one side, via the L-shaped fixing bracket, as shown in Patent Documents 2 to 4, for example. Compared with the case, it is possible to sufficiently secure the mounting strength of the corrugated plate 3 with respect to the spar 2.

  Further, in the present embodiment, since the two downward facing pieces 61 and 65 of the step plate fixing metal fitting 4 are connected by the two bolts 12 and 12, the step plate fixing metal fitting 4 is reliably prevented from rotating with respect to the further beam 2. be able to. That is, if both the downwardly facing pieces 61 and 65 in the step plate fixing bracket 4 are connected by a single bolt, the step plate fixing bracket 4 is connected to the spar 2 with the axis of the one bolt as a fulcrum. There is a risk that it will rotate and interfere with assembly work.

  Therefore, in this embodiment, as described above, the rotation of the step plate fixing bracket 4 can be prevented by connecting the two downward pieces 61 and 65 of the step plate fixing bracket 4 with the two bolts 12 and 12. Assembling work can be performed smoothly.

  Further, in this embodiment, the assembly groove 26 for inserting the outward downward piece 65 of the step plate fixing bracket 4 is formed continuously in the length direction of the spar 2 so that the assembly groove is fixed to the step plate 3. Compared with the case where a plurality of positions are formed at each position, grooving can be performed easily.

  Further, in the indoor staircase of the present embodiment, a handrail mounting bolt hole 52 is formed in the step plate fixing bracket 4 for fixing the step plate 3, and a handrail 71 is provided in the handrail mounting bolt hole 52 of the step plate 3. The bar nut 73 is inserted and arranged, and the bolt 15 inserted through the handrail mounting bolt hole 52 of the corrugated plate fixing bracket 4 is screwed into the bar nut 73 of the hand rail 71 and fixed, whereby the hand rail 71 is attached to the corrugated plate 3. It is to be fixed. Since the step plate fixing bracket 4 for fixing the step plate is also used as a handrail fixing bracket, the number of parts can be reduced, the cost can be reduced, and the stair construction work can be performed more efficiently. Can do.

  In addition, since the step plate fixing bracket 4 also serves as a handrail fixing bracket, even if it is difficult to mount the handrail fixing bracket due to space or work, the step plate fixing bracket 4 is attached. Only, the handrail 71 which comprises a handrail can be attached reliably.

  Further, in the present embodiment, the cross section of the handrail 71 is formed in a rectangular shape that is long in the step width direction, so that it is possible to secure a sufficient strength especially against rolling, and the handrail 71 and thus the handrail 7 are further increased. It can be firmly fixed in a stable state.

  In the present embodiment, the height H (see FIG. 7C) of the corrugated plate fixture 4 is preferably set to 100 mm to 150 mm, more preferably 110 to 130 mm. That is, if the height H is too high, the first-stage kicking height cannot be lowered, and the design freedom may be reduced. On the other hand, when the height H is too low, the front edge of the step plate 3 interferes with the spar 2 and the inclination angle of the spar 2 is restricted, which may reduce the degree of freedom in design.

  Here, in the present embodiment, the height H of the fixing bracket 4 is defined as a height direction that is perpendicular to the upper surface of the step plate receiving plate 5 in the step plate fixing bracket 4 from the upper surface of the step plate receiving piece 5. This corresponds to the dimension (distance) in the height direction to the tip (lower end) of the inner downward piece 61 or the outer downward piece 65.

  For reference, in this embodiment, a step plate fixing bracket 4 having a height of 120 mm and a step plate 3 having a thickness of 30 mm are used, the kick-up dimension is 120 mm + 30 mm = 150 mm, and the step angle (gradient) is up to 50 °. It can be supported.

  Further, in the present embodiment, the depth D (see FIG. 4) of the assembly groove 26 of the sheathing girder 2 may be appropriately adjusted according to the height H (see FIG. 7 (c)) of the corrugated plate fixing bracket 4. For example, it may be set to 30 mm to 60 mm.

  Here, in this embodiment, the depth D of the assembling groove 26 is the direction perpendicular to the upper side surface 21 of the spar 2 and the depth direction of the spar 2 is defined as the depth direction. This corresponds to the dimension (distance) to the bottom surface.

  In the above embodiment, the assembling groove 26 is continuously formed in the spar 2 over the entire length direction. However, the assembling groove 26 is not necessarily formed continuously and is intermittently formed. You may make it form in. In short, in the present invention, it is only necessary that the assembling groove is formed at a position where at least the step plate fixing metal fitting is fixed in the spar, that is, at a position where the outer downward facing piece of the step plate fixing metal fitting is inserted.

  Moreover, in the said embodiment, although the outer side downward piece 65 in the corrugated board fixing metal fitting 4 is connected with the inner side downward piece 61 via the volt | bolt 12, both downward pieces 61 and 65 are not necessarily in this invention. There is no need to concatenate. For example, the outer downward-facing piece 65 may be fixed to the spar 2 through appropriate fixing means in a state where the outer downward-facing piece 65 is inserted into the assembly groove 26.

  In the above embodiment, the handrail 7 is assembled on one side edge of the indoor staircase. However, the present invention is not limited to this. In the present invention, the handrail is assembled on the side edge on both sides of the indoor staircase. Also good. For example, when both sides of an indoor staircase are open, it is preferable to assemble handrails on both side edges of the staircase.

  Moreover, in the said embodiment, although the main pillar of the handrail 7 is attached to the 1st step board 3, it is not restricted to it, In this invention, the main pillar of a handrail is the floor surface in front of the staircase main body 1. The second and subsequent handrails may be attached to the corrugated board 3.

  Moreover, in the said embodiment, although both the downward pieces 61 and 65 in the corrugated board fixing metal fitting 4 are connected by two bolts 12 and 12, in this invention, this number of bolts is not limited, There may be one or three or more. However, as described above, in order to surely prevent the corrugated plate fixing bracket 4 from rotating with respect to the counter girder 2, it is preferable to connect and fix the two downward facing pieces with at least two bolts.

 Moreover, in the said embodiment, although the case where the two girder 2 was provided was mentioned as an example, the installation number of the girder may be three or more, and one may be sufficient. In the case of a single spar, for example, the side facing the indoor wall surface is the inner side, and the side not facing the indoor wall surface (open side) is the outer side. That is, the side that is easy to look into is the outside, and the opposite side is the inside.

  The indoor staircase of the present invention can be applied to, for example, an open staircase assembled indoors such as a general house.

11: Screw (fixing tool for corrugated board)
12: Bolt (connector)
13: Screw (girder fixing tool)
2: Sasara girder 21: Upper side surface 23: Inner side surface 26: Assembly groove 3: Step plate 4: Step plate fixing bracket 5: Step plate receiving plate 51: Step plate mounting screw hole (step plate mounting through hole)
52: Handrail mounting bolt hole (handrail fixing hole)
61: Inside downward 63: Girder mounting screw hole (girder mounting through hole)
65: Outer downward piece 7: Handrail 71: Handrail 74: Bolt (Handrail fixing tool)
75: Kasagi

Claims (4)

An indoor staircase in which a step plate is supported via a step plate fixing bracket on a saddle girder extending obliquely upward,
While the mounting groove is formed at the mounting position of the corrugated plate fixing bracket on the upper side of the sagittal girder,
The corrugated plate fixing bracket includes a corrugated plate receiving plate that is disposed substantially horizontally, an inner downward piece and an outer downward piece that extend downward from the corrugated plate receiving plate and are opposed to each other.
The step plate receiving plate is fixed to the lower surface of the step plate via a step plate fixing tool,
The inner downward piece is arranged along the inner surface of the spar and the inner downward part is inserted into the assembling groove, and the inner downward slid Indoor staircase characterized by being fixed to the side.   The indoor staircase according to claim 1, wherein the inner downward piece and the outer downward piece are connected and fixed to each other by at least two connecting tools penetrating the inner portion of the sheath beam. A handrail is erected on the side edge of the corrugated plate, and a handrail with a cap fixed to the upper end of the handrail,
While a handrail fixing hole is formed in a side edge portion of the step plate receiving plate in the step plate fixing bracket,
The indoor staircase according to claim 1 or 2, wherein a lower end portion of the handrail is fixed to the handrail fixing hole by a handrail fixing tool in a state where the lower end portion is disposed through the side edge portion of the corrugated board. A corrugated plate fixing bracket used when supporting the corrugated plate to the vertical girder extending obliquely upward,
A corrugated plate receiving plate that can be disposed on the back side of the corrugated plate;
When the corrugated plate receiving plate is disposed substantially horizontally, an inner downward piece and an outer downward piece that extend downward from the corrugated plate receiving plate and are arranged in parallel to face each other,
A step plate mounting through hole for fixing the step plate receiving plate to the back side of the step plate is formed in the step plate receiving plate,
A through hole for attaching a girder is formed in the inner downward piece to fix the inner downward piece to the inner side of the further girder,
A corrugated board fixing bracket, wherein the outer downward-facing piece can be inserted into an assembling groove provided on the upper side surface of the further beam.

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