JP6697735B2 - Stairs - Google Patents

Description

  The present invention relates to stairs installed in a building such as a house.

  BACKGROUND ART Conventionally, a staircase that can be used as a temporary staircase has been proposed during construction before construction of a decorative material, and for example, Patent Document 1 below can be cited. In Patent Document 1 below, a front portion where a horizontal plane and a vertical plane of a side plate intersect is cut out, and a cross-linking material is firmly fixed to the cut-out portion with a nail or the like, and the cross-linking material is arranged between a pair of side plates. It is disclosed to establish. Then, it is described that by fixing the base tread on the cross-linking material and the horizontal surfaces of the pair of side plates, it can be used as a temporary staircase, that is, as a work elevating passage.

JP, 2001-329669, A

  However, the staircase disclosed in Patent Document 1 is troublesome because it is necessary to fix the erection member to the horizontal surface of the side plate using a fastener such as a nail. Further, the cross-linking material described in Patent Document 1 is arranged at the front position of the base tread plate so as to be easily leveled out, and does not improve the strength of the tread when used as a temporary staircase.

  The present invention has been proposed in view of the above points, and an object thereof is to provide a stairway that has strength as a temporary staircase and is easy to install.

In order to achieve the above object, a staircase according to the present invention includes a pair of left and right side plates in which horizontal and vertical surfaces are alternately formed, and at least two recessed grooves formed on each horizontal surface of the side plates. and at least two bridging members bridged between the pair of side plates but is fitted, and the underlying tread plate disposed on the upper surface and the horizontal surface of the installation member, and riser plate disposed in said vertical plane And a decorative tread that is fixed to the upper surface of the underlying tread, the underlying tread being abutted against the lower surface of the underlying tread and abutting against the inner surface of the side plate. It is characterized in that a tread fixing tool having a side plate abutting portion fixed in this state is arranged and fixed between the two concave grooves in a side view .

  Since the staircase according to the present invention has the above-mentioned configuration, it has strength as a temporary staircase and is easy to install.

It is the figure which showed typically in order to demonstrate the construction process of the stairs which concerns on embodiment of this invention, (a) made the fitting member fit in a recessed groove, and constructed the stairs construction process spanned between the side plates. The side view shown, (b) is a perspective view of (a). (A) is a side view showing the construction process of the same staircase, (b) is a figure explaining the fixed state of a base tread in the state of (a), and is a perspective view which looked at a temporary staircase from the back side. (A) And (b) is a side view which shows the construction process of the stairs. (A) And (b) is a side view which shows the construction process of the stairs. It is the perspective view which looked at the same stairs from the back side.

Embodiments of the present invention will be described below with reference to the drawings.
In the following embodiments, the state of facing the constructed staircase from the lower floor side is the reference, the front side is the front side, the opposite side is the rear side (back side), and the vertical direction based on the state. The left-right direction, the vertical and horizontal directions, etc. will be described. 1 to 5 are explanatory diagrams for explaining the stairs according to the present embodiment, and in some of the drawings, some of detailed symbols attached to other drawings are omitted. Further, the enlarged view shown in FIG. 4B is a partially exploded side view for the sake of explanation.

  In the staircase 1 according to the present embodiment, a pair of left and right side plates 2 and 2 in which horizontal planes 2a and vertical planes 2b are alternately formed, and recesses 2c formed in each horizontal plane 2a of the side plate 2 have end portions 3b. An erection member 3 that is fitted and bridged between the pair of side plates 2 and 2. In addition, the staircase 1 has a base tread plate 4 arranged on the upper surface 3a of the erection member 3 and a horizontal surface 2a of the side plate 2, a riser plate 6 arranged on the vertical surface 2b of the side plate 2, and an upper surface 4a of the base tread plate 4. And a decorative tread 7 fixed to the. The details will be described below.

  The stairs 1 may be constructed as a stairway between a lower floor and an upper floor in a building such as a residence, or may be constructed as a stairway to a loft such as an attic. The pair of side plates 2 and 2 forming the stairs 1 are flat plates arranged according to the gradient of the stairs 1, and are arranged substantially parallel to the left and right along a wall surface (not shown). The material of the side plate 2 is not particularly limited, but may be made of solid wood, wood laminated boards such as plywood, laminated wood, wood-based materials such as wood fiberboard, synthetic resin-based materials, It may be formed from wood powder (wood)/plastic composite material or the like. Further, a surface decorative sheet such as a veneer or a resin film may be adhered or applied to the surface of the base material made of these, and the surface decorative treatment may be applied thereto. As shown in FIGS. 1(a) and 1(b), a horizontal plane 2a and a vertical plane 2b are alternately formed on the side plate 2 in a step-like manner, and the horizontal plane 2a has a rectangular cutout. A plurality of grooves 2c are formed. The concave groove 2c is formed so that one end 3b of the erection member 3 is fitted. Specifically, the recessed groove 2c is fixed to the left and right ends 3b and 3b of the erection member 3 by fitting into the recessed grooves 2c and 2c formed in the pair of side plates 2 and 2, respectively. And is formed so that it can be supported (see FIG. 5). The concave groove 2c is formed by cutting out in a rectangular shape that is long in the vertical direction, and the depth dimension thereof is substantially the same as the height dimension (vertical dimension) of the erection member 3. The depth dimension of the concave groove 2c is substantially the same as the thickness dimension of the erection member 3. Thereby, when the erection member 3 is fitted and assembled from the upper opening of the groove 2c toward the depth direction of the groove 2c, the erection member 3 is housed in the groove 2c and the horizontal surface 2a of the side plate 2 and the erection member. The upper surface 3a of 3 is substantially flush. The shape of the concave groove 2c is set according to the shape and size of the erection member 3, and is not limited to the example shown in the figure, and may be formed by cutting out into a rectangular shape or a substantially square shape that is long in the front-rear direction. Further, in the illustrated example, two recessed grooves 2c are formed on each horizontal surface 2a, but the present invention is not limited to this, and the number may be increased or decreased depending on the depth dimension of the horizontal surface 2a. The wall surface to which the side plate 2 is fixed may be a pillar material such as a stud, or a structural frame of a building such as a stud, a steel material, and reinforced concrete.

  The erection member 3 is a rectangular rod member having a size such that both end portions 3b, 3b are fitted and fixed in the concave grooves 2c, 2c of the pair of side plates 2, 2. The material of the erection member 3 is also not particularly limited, but may be made of wood-based material, synthetic resin-based material, wood powder (wood-based)/plastic composite material, or the like. Although the thickness dimension of the erection member 3 is not particularly limited, it may be about 50 mm to 150 mm. Since the both ends 3b, 3b of the erection member 3 are fitted and fixed in the concave grooves 2c, 2c of the pair of side plates 2, 2, it is possible to firmly fix the erection member 3 without using a fixing tool such as a screw. Further, as described above, since the horizontal planes 2a, 2a of the side plates 2, 2 and the upper surface 3a of the erection member 3 can be formed to be substantially flush with each other, the horizontal planes 2a, 2a of the side plates 2, 2 and the erection member 3 can be formed. The base tread plate 4 can be arranged so as to overlap with the upper surface 3a (see FIG. 2A).

  As shown in FIG. 2A, the base tread 4 has a rectangular flat plate shape having a lateral width dimension in which both ends are fixed to the horizontal planes 2a, 2a of the pair of side plates 2, 2. The material of the base tread 4 is not particularly limited, but may be made of wood-based material, synthetic resin-based material, wood powder (wood)/plastic composite material, or the like. The thickness dimension of the base tread 4 is not particularly limited, but may be about 10 mm to 25 mm. The base tread 4 has a notch 40 formed by cutting out from the front end surface 4b to the lower surface 4c of the base tread 4, and in the drawing, 4a is an upper surface, 4b is a front end surface, 4c is a lower surface, 4d is a rear end surface, and 40a is a back surface. Indicates a cutout lower surface, and 40b indicates a cutout front end surface. The notch front end surface 40b of the notch portion 40 is formed so as to be substantially flush with the vertical surface 2b of the lower side plate 2 in a state in which the base tread 4 is installed on the horizontal surface 2a. The base tread 4 is placed on the horizontal planes 2a, 2a such that the rear end surface 4d is in contact with the vertical surfaces 2b, 2b of the side plates 2, 2 and is fixed in that state. The method of fixing the base tread 4 to the side plate 2 is not particularly limited, but as shown in FIG. 2B, the base tread 4 may be fixed from below by a tread fixture 5 having a substantially L-shaped cross section. The tread plate fixture 5 includes a tread plate contact portion 5a that abuts the lower surface 4c of the base tread plate 4 to fix the base tread plate 4, and a side plate abutment that abuts the inner side surface 2d of the side plate 2 and is fixed to the side plate 2. And a portion 5b. Each of the tread plate abutting portion 5a and the side plate abutting portion 5b is formed with an insertion hole through which a fixture (not shown) such as a wood screw is inserted. The step plate 4 is fixed to the step plate contact portion 5a, and the side plate contact portion 5b is fixed to the side plate 2 by a fixing tool inserted from the side plate contact portion 5b. By fixing the base tread plate 4 with the tread plate fixing tool 5 in this manner, the side tread 2 can be firmly connected and the base tread plate 4 can be supported from below. The strength for holding the base tread 4 can be increased as compared with the case where the base tread 4 is fixed. Further, since it is possible to prevent the fixture from appearing on the upper surface 4a of the base tread plate 4, in this case, there is no risk of being caught by a fixture for fixing the base tread plate 4 when used as the temporary stairs 100, Further, it becomes easy to apply the decorative tread 7 to the upper surface 4a of the base tread 4. The method of fixing the base tread 4 is not limited to the example shown in FIG.

  The staircase composed of the pair of side plates 2 and 2, the erection member 3 and the base tread plate 4 shown in FIG. 2A serves as a temporary staircase 100 in this state that does not require curing to prevent pollution during construction of the house. Can be used. Even in such a temporary staircase 100 during construction, the base tread 4 is fixed to the pair of side plates 2 and 2 and is supported by the erection member 3, so that the strength as the tread increases and during the ascent/descent. Can increase the safety of. Further, in the example shown in the figure, a plurality of concave grooves 2c are formed in the side plate 2 and two erection members 3 are installed in each stage, so compared with the case where one installation member is installed in each stage, It is possible to improve the strength of the base tread 4 as a tread.

  The riser plate 6 is disposed in the riser portion of the stairs 1 and has a lateral width dimension such that both ends thereof are fixed to the vertical surfaces 2b and 2b of the pair of side plates 2 and 2. As shown in FIG. 3A, etc., it has a rectangular flat plate shape having a height dimension that can be placed between the notch 40 of the upper step tread 4 and the upper surface 4a of the lower step tread 4. The material of the riser plate 6 is not particularly limited, but may be made of solid wood, wood laminated material such as plywood, laminated wood, wood fiber material such as wood fiber board, or synthetic resin material or Alternatively, it may be formed of wood powder (wood)/plastic composite material or the like. Further, the surface of the base material made of these may be subjected to a surface cosmetic treatment by sticking a surface decorative sheet such as a veneer or a resin film or by coating. The thickness of the riser plate 6 is not particularly limited, but may be a thin plate having a thickness of, for example, about 4 mm to 10 mm. In the figure, 6a is an upper end surface, 6b is a front surface, 6c is a lower end surface, 6d is a rear surface, 6da is an upper rear surface, 6ba is a front upper end portion, and 6bb is a front lower end portion. As shown in FIG. 3( a ), the riser plate 6 contacts the vertical faces 2 b and 2 b of the pair of side plates 2 and 2 at both left and right ends of the rear face 6 d, and the riser plate 6 is inserted into the notch 40 of the upper base tread plate 4. The upper end surface 6a is fixed. Specifically, the upper rear surface 6da of the riser plate 6 is arranged so as to contact the notch front end surface 40b of the notch 40, and the upper end surface 6a of the riser plate 6 approaches or abuts the notch lower surface 40a of the notch 40. Are distributed to. Therefore, when disposing the riser plate 6, it is possible to prevent the upper end surface 6a of the riser plate 6 from hitting the upper base tread plate 4 and bending, and the riser plate 6 can be arranged with good fit. The lower end surface 6c of the riser plate 6 is placed on the upper surface 4a of the lower step tread plate 4 and when the nose member 8 and the decorative tread plate 7 are arranged, the front upper end portion 6ba is below the upper step nose member 8. The front lower end portion 6bb is disposed in contact with the end surface 8e and in contact with the rear end surface 7d of the lower decorative tread 7. The method of fixing the riser plate 6 is not particularly limited, and the riser plate 6 can be fixed using, for example, an adhesive or the like. As shown in the figure, the front upper end portion 6ba of the riser plate 6 is sandwiched by the nose member 8 and the front lower end portion 6bb is sandwiched by the decorative tread plate 7. Further, the left and right end portions of the riser plate 6 are brought into contact with the vertical surface 2b. By arranging them in such a manner, the amount of the adhesive used for fixing the riser plate 6 can be suppressed as much as possible.

  As shown in FIG. 3( b ), the decorative tread 7 is fixed on the upper surface 4 a of the base tread 4 in an overlapping manner. The decorative tread 7 is a rectangular flat plate having a width dimension substantially equal to that of the base tread 4 and a depth dimension slightly smaller than the depth dimension of the base tread 4, and a cutout is formed from the upper surface 7a to the front end surface 7b. A tread cutout 70 is formed. The material of the decorative tread plate 7 is not particularly limited, and the same material as the riser plate 6 can be used. Although the thickness dimension of the decorative tread 7 is not particularly limited, it may be thinner than the base tread 4, for example, about 8 mm to 20 mm. In the figure, 7a is an upper surface, 7b is a front end surface, 7c is a lower surface, 7d is a rear end surface, and 70 is a tread cutout. The decorative tread 7 is superposed on the upper surface 4a of the underlying tread 4, and the lower surface 7c and the upper surface 4a of the underlying tread 4 are in contact with each other. Further, the rear end surface 7d of the decorative tread 7 is arranged so as to contact the front lower end portion 6bb of the riser plate 6, and in this state, it is fixed to the upper surface 4a of the base tread 4 with a double-sided tape, an adhesive or the like.

  In the present embodiment, an example in which the decorative tread plate 7 is arranged after the riser plate 6 is arranged is described. However, the present invention is not limited to this, and after the decorative tread plate 7 is arranged on the base tread plate 4, The riser plate 6 may be arranged. In this case, the step plate notch 70 of the decorative tread plate 7 is fixed by the pressing member 9, and the rear end upper surface of the decorative tread plate 7 is arranged so that the lower end surface 6c of the riser plate 6 abuts. Therefore, the front and rear ends of the upper surface 7a of the decorative tread 7 are pressed down, so that the warp of the decorative tread 7 can be suppressed and the amount of adhesive or the like used to fix the decorative tread 7 can be suppressed. Further, since the makeup tread plate 7 is pressed from above by the riser plate 6, the fall of the makeup tread plate 7 can be prevented.

  As shown in FIG. 4B and the like, the nosing member 8 is arranged from the upper surface 4a of the base tread 4 to the front end surface 4b and the notch lower surface 40a, and has a substantially U-shaped cross section having substantially the same lateral width dimension as the base tread 4. It is a member formed in a shape. The material of the nosing member 8 is not particularly limited, and may be the same as the riser plate 6 and the decorative tread plate 7. In the figure, 8a indicates an upper cover portion, 8b indicates a front cover portion, 8c indicates a lower cover portion, 8d indicates a butt end surface (one end surface of the nose member 8), and 8e indicates a lower end surface (the other end surface of the nose member 8). ing. The upper cover 8a of the nosing member 8 is formed to be substantially flush with the upper surface 7a of the decorative tread 7, the front cover 8b is formed to cover the front end surface 4b of the base tread 4, and the lower cover 8c. Is formed so as to cover up the notched lower surface 40a of the base tread 4. On the upper cover portion 8a of the nose member 8, a nose cutout portion 80 is formed which is cut out at the abutting end face 8d with the decorative tread 7. The abutting end surface 8d of the nose member 8 is arranged in contact with the front end surface 7b of the decorative tread 7, and the lower end surface 8e is arranged in contact with the front upper end portion 6ba of the riser plate 6. The nose cutout 80 of the nose member 8 is formed to be larger than the tread cutout 70 of the decorative tread 7, and the recessed groove 10 extending across the nose cutout 80 and the tread cutout 70 is provided (see FIG. See FIG. 3B).

  As shown in FIG. 4A, the recessed groove 10 formed by abutting the nose cutout portion 80 and the step plate cutout portion 70 is provided with a pressing member 9 that fits into the recessed groove 10. The pressing member 9 is formed in a substantially U-shaped cross-section that opens upward, and the upper end portions 9a and 9a are formed so as to slightly project from the upper cover portion 8a of the nose member 8 and the upper surface 7a of the decorative tread 7. A groove 9b is formed in the longitudinal direction of the pressing member 9. The material of the pressing member 9 is not particularly limited, but may be made of, for example, a soft synthetic resin material or an elastic material, or the pressing member 9 may be colored differently from other parts to improve the visibility. It may be designed as In this way, if the pressing member 9 has a color different from that of the other parts, it is possible to suppress the stepping off of the decorative tread 7 and improve the safety. In the figure, 9a indicates an upper end portion, 9b indicates a concave groove, and 9c indicates a bottom surface. The presser member 9 is fixed in a state in which it is fitted in the concave groove 10 by a fixture 12 which penetrates the presser member 9 and the nose member 8 and reaches the base tread plate 4 (see an enlarged view of FIG. 4B). As described above, the nose member 8 has the nose cutout portion 80 formed larger than the tread cutout portion 70, and can be firmly fixed by the holding member 9 fitted in the groove 10. Further, the pressing member 9 is fitted into the recessed groove 10 extending over both the nose member 8 and the decorative tread 7, and is fixed by the fixture 12. Therefore, the pressing member 9 also plays a role of fixing both the nose member 8 and the decorative tread 7 together by one member.

  As shown in FIG. 4( b ), the cover member 11 is fitted into the concave groove 9 b of the pressing member 9 so as to cover it from above. The material of the cover member 11 is not particularly limited, but may be the same as that of the pressing member 9. The cover member 11 is formed in an inverted U-shape in cross section, and in the drawing, 11a indicates a leg portion and 11b indicates an upper surface. The cover member 11 is arranged such that the leg portions 11 a are in contact with the bottom surface 9 c of the pressing member 9 so as to cover the head of the fixture 12. The upper surface 11b of the cover member 11 has substantially the same height as the upper cover portion 8a of the nose member 8 and the upper surface 7a of the decorative tread 7 when the cover member 11 is fitted in the concave groove 9b of the pressing member 9. Is formed. Since the cover member 11 can cover up the fixture 12 that fixes the pressing member 9, the staircase 1 can be made to look good.

Next, an example of a construction procedure of the stair 1 having the above-mentioned configuration will be described with reference to FIGS. The procedure described below is an example, and the present invention is not limited to this.
First, the pair of side plates 2 and 2 are fixed along the wall surface (not shown). Next, as shown in FIG. 1A, the erection member 3 is disposed so as to fit over the recessed grooves 2c, 2c of the pair of side plates 2, 2 and bridge. At this time, in order to more firmly fix the erection member 3 to the concave groove 2c, an adhesive may be applied to the fitting portion, but a fixing means such as a wood screw for fixing the erection member 3 to the side plate 2 is not necessary. . Further, when the erection member 3 is arranged, it may be possible to place a level on the upper surface 3a of the erection member 3 to check whether or not it can be arranged horizontally.

  Next, as shown in FIG. 2A, the base tread 4 is arranged. The lower surface 4c of the ground tread 4 is arranged on the horizontal surface 2a of the side plate 2 and the upper surface 3a of the erection member 3, and the left and right ends of the rear end surface 4d are arranged so as to contact the vertical surfaces 2b, 2b of the pair of side plates 2, 2. To do. Then, the notch front end face 40b of the notch 40 and the vertical faces 2b, 2b of the lower side plates 2, 2 are substantially flush with each other. In this state, the stairs 1 is turned to the rear side of the installation place, the tread plate contact portion 5a of the tread plate fixture 5 is brought into contact with the lower surface 4c of the base tread plate 4, and the side plate contact portion 5b is brought into contact with the inner surface 2d of the side plate 2. Thus, the tread fixture 5 is fixed using a fixture such as a screw in this state (see FIG. 2B). At this time, a level is placed on the upper surface 4a of the base tread 4 to check whether the level is horizontal. The temporary staircase 100 is constructed through the construction procedure as described above.

  After the use as the temporary stairs 100 is finished, the riser plate 6, the decorative tread plate 7 and the like are sequentially installed to finish the stairs 1. First, the riser plate 6 is arranged as shown in FIG. The lower end surface 6c of the riser plate 6 is placed on the upper surface 4a of the lower step plate 4 and the upper end surface 6a of the riser plate 6 abuts or comes close to the cutout lower surface 40a of the cutout portion 40 of the base stepboard 4. It is installed. Moreover, the upper rear surface 6da of the riser plate 6 is arranged so as to contact the notched front end surface 40b of the notch portion 40, and the left and right ends of the rear surface 6d contact the vertical surfaces 2b, 2b of the side plates 2, 2. At this time, the riser plate 6 may be fixed to the side plates 2 and 2 or the notch 40 by an adhesive or the like.

Subsequently, as shown in FIG. 3B, the decorative tread 7 is arranged. The decorative tread plate 7 is arranged so as to be superposed on the upper surface 4a of the base tread plate 4, and the rear end surface 7d of the decorative tread plate 7 is arranged in contact with the front lower end portion 6bb of the riser plate 6, and in this state. Is fixed to the base tread 4 with a double-sided tape or an adhesive.
Next, the nosing member 8 is arranged as shown in FIGS. The abutting end surface 8d of the nose member 8 is arranged in contact with the front end surface 7b of the decorative tread 7, and the lower end surface 8e thereof is arranged in contact with the front upper end portion 6ba of the lower riser plate 6. When the nose cutout 80 of the nose member 8 and the tread cutout 70 of the decorative tread 7 are abutted with each other, the recessed groove 10 extending over both is provided. Then, the pressing member 9 is fitted into the recessed groove 10 thus formed, and the pressing member 9 is fixed to the recessed groove 10 from above by a fixture 12 penetrating the pressing member 9 and the nosing member 8. In this way, after fixing the nosing member 8 and the pressing member 9, the cover member 11 is fitted into the concave groove 9b of the pressing member 9. Through the construction procedure as described above, the staircase 1 shown in FIGS. 4B and 5 is constructed.

  As described above, according to the present embodiment, since the both end portions 3b, 3b of the erection member 3 are fitted and fixed in the concave grooves 2c, 2c of the side plates 2, 2, it is easy to use without using a fixture such as a wood screw. Can be installed in Further, even in the temporary staircase 100 under construction, since the base tread 4 is supported by the erection member 3 laid down, the strength as the tread can be secured. Further, in the case of being used as the temporary stairs 100, even if the building material or the like comes into contact with the base tread 4 and the base tread 4 is scratched, the decorative tread 7 and the nose member 8 are arranged later. Because of the structure, it is possible to cover the scratches and the like on the base tread 4 with the makeup tread 7 and the nosing member 8. Therefore, the temporary staircase 100 that does not require curing can be provided. Furthermore, if the decorative tread 7 and riser 6 to be installed on the temporary stairs 100 are assumed to be reformed in the future and the adhesive is used as little as possible so that they can be easily removed, the stairs 1 can be installed. After that, the base tread 4 can be left as it is and the decorative tread 7 and the riser 6 can be exchanged.

  The shapes of the staircase 1, the temporary staircase 100, the pair of side plates 2 and 2, the erection member 3, the base tread plate 4, the riser plate 6, the decorative tread plate 7, the nose member 8, the pressing member 9, the cover member 11 and the like in the present embodiment. The configuration is not limited to the illustrated example. Further, the fixing means of each member, the fixing procedure, etc. are not limited to the illustrated examples, and the construction procedure is not limited to the above. For example, the step of disposing the nosing member 8 prior to the disposition of the decorative tread plate 7 is performed. You may go to

1 staircase 2 side plate 2a horizontal plane 2b vertical surface 2c concave groove 3 erection member 3a upper surface 3b end 4 base tread 4a upper surface 6 riser 7 decorative tread

Claims (3)

A pair of left and right side plates in which horizontal planes and vertical planes are alternately formed, and at least two recessed grooves formed in each horizontal plane of the side plates, the ends of which are fitted and bridged between the pair of side plates. Two erection members, a base tread plate arranged on the upper surface of the erection member and the horizontal plane, a riser plate arranged on the vertical surface, and a makeup tread plate fixed to the upper surface of the base tread plate. Prepare,
The base tread is a tread fixture having a tread abutment fixed in contact with the lower surface of the base tread and a side abutment fixed in contact with the inner surface of the side plate. A staircase, which is arranged and fixed between the two recessed grooves in a side view . In claim 1,
The base tread has a notch formed from the front end surface to the lower surface,
A staircase characterized by being fixed in a state where the upper end surface of the riser plate is aligned with the cutout portion. In claim 2,
Further comprising a nosing member arranged from the upper surface of the base tread to the front end surface and the lower surface,
The nosing member has a substantially U-shaped cross-section formed such that one end surface of the nose member is in contact with the front end surface of the decorative tread plate and the other end surface is opposed to the front upper end portion of the riser plate. Stairs that are characterized by being.

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