JP4008128B2

JP4008128B2 - Stair structure

Info

Publication number: JP4008128B2
Application number: JP31991698A
Authority: JP
Inventors: 祐昌中本; 健三中尾; 研吾一色
Original assignee: Wood One Co Ltd
Current assignee: Wood One Co Ltd
Priority date: 1998-10-22
Filing date: 1998-10-22
Publication date: 2007-11-14
Anticipated expiration: 2018-10-22
Also published as: JP2000129880A

Description

【０００１】
【発明の属する技術分野】
本発明は、住宅等に使用される階段構造に関するものである。
【０００２】
【従来の技術】
従来、箱型階段の変形として、雛段型と称される階段が多用されている。例えば図３に示すように、傾斜配置された一対の平行な側板１，１の上側に、予め段状に切り欠きによって形成された複数の水平段部２に、それぞれ踏み板４が雛段状に載せられたうえ、釘・木ねじ等（以下釘等と呼称）で固定され、さらに、水平段部２の前端面に当接する蹴込板６の下端部が下段側の踏み板４と水平段部２の前端面との間に差し込まれるよう立設されると共に、その上端部が踏み板４の前端部の下面に形成された凹溝４ａに嵌合されたものが知られている。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記従来の階段構造は、次のような問題点を有する。すなわち、（ア）仕上がり精度が低い
図３に示すように、各水平段部２上に踏み板４が設置される場合、位置決めが困難であってずれて取付けられると隙間１２が生じたままになることがあった。これは、踏み板４に釘等の打ち込み用の下穴が完全に穿けられていない限り、金槌の手打ちでは、釘Ｎ１等が水平段部２に達するまでには数回の打撃が必要であり、踏み板４が手で押さえられていても打撃の振動によって踏み板４が定位置よりずれてしまうことにあった。電動ドライバーでも略同様であった。
なお、手による踏み板４固定は、片手で金槌を持ち、残る片手だけで踏み板４を保持する必要があるため、作業者に無理な姿勢を強いることになり、作業者の疲労が大きく、労働災害の危険性も高かった。
（イ）踏み板の固定には長い釘等が必要である。
踏み板４は、強度上の配慮から、厚さは、３０〜３６ｍｍに設定される場合が多い。それに伴って、図３に示すように、釘Ｎ１等は、必然的に長さが５０ｍｍ以上の長いものが必要となる。しかし、長い釘は高価である上に、下穴を予めあけておかないと打ち込みにかなり時間がかかり、その抵抗も大きく、折れ曲がったりする。一方、木ネジの場合、ネジ頭が変形してしまい、ドライバー用の溝が潰れてしまう恐れもある。
【０００４】
そこで本発明の目的とするところは、上記従来例の欠点を解消した、施工も容易で、仕上がり精度が高く、長い釘等を必要とせず、安価な階段構造を提供することにある。
【０００５】
【課題を解決するための手段】
上記の目的を達するために、請求項１の発明の階段構造は、傾斜配置された一対の平行な側板（１，１）の上側に、予め段状に切り欠きによって形成された複数の水平段部（２）に、それぞれ踏み板（４）が雛段状に載せられ固定され、蹴込板（６）が、下段側の踏み板（４）の後端部と上段側の踏み板（４）の前端部との間に立設されるように設けられた階段構造であって、踏み板（４）の後端部が、上段側の水平段部（２）の前端面下部に形成された凹部（２ｕ）に嵌合されると共に、踏み板（４）の前部下面に形成された凹部（４ａ）に、水平段部（２）の前端部上面に形成された凸部（２ｎ）と蹴込板（６）の上端部が嵌合され、かつ踏み板（４）の後部上面に形成された凹溝（４ｂ）に蹴込板（６）の下端部が嵌合されていることを特徴とするものである。
【０００６】
また請求項２の発明は、請求項１の発明の構成に加えて、水平段部（２）の前端部上面に形成された凸部（２ｎ）は、前端部上面に凹部（２ｍ）を形成することによりそれより前側の部位を凸部（２ｎ）としたものであって、その前端部上面の凹部（２ｍ）に、踏み板（４）の後端部下面に凹部（４ｖ）が形成されその凹部（４ｖ）と踏み板（４）の前部下面に形成された凹部（４ａ）との間に生じる凸部（４ｕ）を嵌合させることを特徴とするものである。
【０００７】
更に請求項３の発明は、請求項１又は２の発明の構成に加えて、水平段部（２）の前端部上面に形成された凸部（２ｎ）に向かって、釘（Ｎ２）等を打ち込み可能な凹溝（４ｃ）が踏み板（４）の前端部上面に形成されたその凹溝（４ｃ）に、踏み板（４）の前端部及び前端面を覆う滑り止め（９）の下面に形成された凸部（９ａ）が脱着自在に嵌着されるよう構成されていることを特徴とするものである。
【０００８】
なお、上記の課題を解決するための手段に記載された括弧内の記号は図面及び後述する発明の実施の形態に記載された記号に対応するものである。
【０００９】
請求項１の発明によれば、踏み板の後端部が、上段側の水平段部の前端面に形成された凹部に嵌合されると共に、踏み板の前部下面に形成された凹部に、水平段部の前端部上面に形成された凸部と蹴込板の上端部が嵌合されることによって、水平段部に対する踏み板の位置決めが高精度で自動的に行われる。そのうえ、施工時に作業者の肘等で、踏み板が水平段部に向かって押さえられれば、上下方向の変位が拘束され、水平段部への載置の位置決めが、極めて正確になされる。したがって、蹴込板の位置も隙間なく定まる。
【００１０】
踏み板を水平段部に固定するに当たっては、さらに、作業者は一方の手で釘等の位置・姿勢を保持し、他方の手でその頭を叩き（又は回し）、水平段部に押し込むことになるが、その間、踏み板は上述のように保持されているため、変位することはなく、正確な位置に固定される。したがって、作業者に無理な姿勢を強いることなく安全で作業者の疲労も小さい。
【００１１】
さらに、踏み板の前部分や踏み板の後部分に凹部が形成された部分はその分だけ板厚が薄くなっているので、従来例に比較して短く、安価な釘等の使用が可能となり、それだけ押し込み長さが減少し、水平段部に向かっての釘打ちも容易となる。
【００１２】
また請求項２の発明によれば、請求項１の発明の作用効果に加えて、水平段部の前端部上面の凹部に、踏み板の下面の凸部が嵌合されるので、踏み板の位置決めが一層高精度に行われる。
【００１３】
更に請求項３の発明によれば、請求項１又２の発明の作用効果に加えて、踏み板の前端部上面に形成された凹溝によって板厚が一層薄くなっているので、さらに短く、安価な釘類の使用が可能となり、それだけ押し込み長さが減少し、水平段部に向かっての釘打ちも容易となる。そのうえ、凹溝内に打ち込まれた釘類の頭は、滑り止めの凸部の嵌着によって覆われるため、外観が向上する。
【００１４】
【発明の実施の形態】
本発明の実施の形態例に係る階段構造について図面を参照して説明すると、図１はその縦断面図、図２は図１の要部の分解断面図である。
【００１５】
本発明の実施の形態例に係る階段構造は、傾斜配置された一対の平行な側板１，１の上側に、予め段状に切り欠きによって形成された複数の水平段部２に、それぞれ踏み板４が雛段状に載せられたうえ、釘等Ｎ２で固定され、蹴込板６が、下段側の踏み板４の後端部と上段側の踏み板４の前端部との間に立設されるように設けられている。
【００１６】
側板１について説明すると、水平段部２の前端部上面には凹部２ｍが形成されていて、凹部２ｍよりも前側の上面には凸部２ｎが形成され、凹部２ｍよりも後側の上面にも凸部が形成されている。また、上段側の水平段部２の前端面下部には、踏み板４の後端部が嵌合可能に、水平方向に向けて凹部２ｕが形成されている。凹部２ｕには面取りが施されていて踏み板４を取付け易くしてある。
【００１７】
踏み板４について説明すると、前部下面には凹部４ａが形成されており、後端部下面には凹部４ｖが形成されている。その結果、その凹部４ｖと踏み板４の前部下面に形成された凹部４ａとの間には凸部４ｕが形成される。また、踏み板４の後部上面には凹溝４ｂが形成され、かつ前端部上面には凹溝４ｃが形成されている。
【００１８】
そして、踏み板４の前部下面に形成された凹部４ａに、水平段部２の前端部上面に形成された凸部２ｎと蹴込板６の上端部が嵌合され、かつ踏み板４の後部上面に形成された凹溝４ｂに蹴込板６の下端部が嵌合されるようになっている。また、このとき水平段部２の前端部上面に形成された凹部２ｍに、踏み板４の下面に形成された凸部４ｕが嵌合されるようになっている。
【００１９】
また、踏み板４の前端部上面に形成された凹溝４ｃには、水平段部２の前端部に形成された凸部２ｎに向かって、釘Ｎ２が打ち込み可能であり、その凹溝４ｃには、踏み板４の前端部及び前端面４ｔを覆う滑り止め９の下面に形成された凸部９ａが脱着自在に嵌着されるよう構成されている。
【００２０】
以上のように構成された階段構造によれば、踏み板４の後端部が、上段側の水平段部２の前端面に形成された凹部２ｕに嵌合されると共に、踏み板４の前部下面に形成された凹部４ａに、水平段部２の前端部上面に形成された凸部２ｎと蹴込板６の上端部が嵌合されることによって、水平段部２に対する踏み板４の位置決めが高精度で自動的に行われる。
そのうえ、幅方向の位置調整後、施工時に作業者の肘等で、踏み板４が水平段部２に向かって押さえられれば、上下方向の変位が拘束され、水平段部２への載置の位置決めが、極めて正確になされる。したがって、蹴込板６の位置も隙間なく定まる。
【００２１】
踏み板４を釘Ｎ２類によって水平段部２に固定するに当たっては、さらに、作業者は一方の手で釘Ｎ２等の位置・姿勢を保持し、他方の手で金槌（又はドライバ）を持ってその頭を叩き（又は回し）、水平段部２に押し込むことになるが、その間、踏み板４は上述のように強固に保持されているため、変位することはなく、正確な位置に固定される。したがって、作業者に無理な姿勢を強いることなく安全で作業者の疲労も小さい。
この間に、水平段部２の前端面に当接するよう、上段側の踏み板４の凹部４ａと下段側の踏み板４の凹溝４ｂに対して、蹴込板６の上下各端部が嵌合される。そのため、仕上がり精度が高く、蹴込板６が傾いたり、水平段部２の前端面との間に隙間が生じたりすることはない。なお、その前に、踏み板４の凹溝４ｂ内には水平段部２に向かって釘Ｎ２類が打ち込まれる。
【００２２】
さらに、踏み板４の前部分や踏み板４の後部分に凹部４ａ，４ｖが形成された部分はその分だけ板厚が薄くなっているので、従来例に比較して短く、安価な釘等の使用が可能となり、それだけ押し込み長さが減少し、水平段部２に向かっての釘打ちも容易となる。
【００２３】
また踏み板４の凹溝４ｃが形成された部分は、凹溝４ｃによっても板厚がさらに薄くなっており、さらに短く、安価な釘類Ｎ２の使用が可能となり、それだけ押し込み長さが減少し、水平段部２に向かっての釘打ちも容易となる。なお、凹溝４ｂ，４ｃ内に打ち込まれた釘Ｎ２の頭は、蹴込板６の下端部や滑り止め９の凸部９ａの嵌合によって覆われるため、外からは見えず、外観が向上する。
【００２４】
【発明の効果】
請求項１の発明によれば、踏み板の後端部が、上段側の水平段部の前端面に形成された凹部に嵌合されると共に、踏み板の前部下面に形成された凹部に、水平段部の前端部上面に形成された凸部と蹴込板の上端部が嵌合されることによって、水平段部に対する踏み板の位置決めが高精度で自動的に行われる。そのうえ、施工時に作業者の肘等で、踏み板が水平段部に向かって押さえられれば、上下方向の変位が拘束され、水平段部への載置の位置決めが、極めて正確になされる。したがって、蹴込板の位置も隙間なく定まる。
【００２５】
踏み板を水平段部に固定するに当たっては、さらに、作業者は一方の手で釘等の位置・姿勢を保持し、他方の手でその頭を叩き（又は回し）、水平段部に押し込むことになるが、その間、踏み板は上述のように保持されているため、変位することはなく、正確な位置に固定される。したがって、作業者に無理な姿勢を強いることなく安全で作業者の疲労も小さい。
【００２６】
さらに、踏み板の前部分や踏み板の後部分に凹部が形成された部分はその分だけ板厚が薄くなっているので、従来例に比較して短く、安価な釘等の使用が可能となり、それだけ押し込み長さが減少し、水平段部に向かっての釘打ちも容易となる。
【００２７】
また請求項２の発明によれば、請求項１の発明の作用効果に加えて、水平段部の前端部上面の凹部に、踏み板の下面の凸部が嵌合されるので、踏み板の位置決めが一層高精度に行われる。
【００２８】
更に請求項３の発明によれば、請求項１又２の発明の作用効果に加えて、踏み板の前端部上面に形成された凹溝によって板厚が一層薄くなっているので、さらに短く、安価な釘類の使用が可能となり、それだけ押し込み長さが減少し、水平段部に向かっての釘打ちも容易となる。そのうえ、凹溝内に打ち込まれた釘類の頭は、滑り止めの凸部の嵌着によって覆われるため、外観が向上する。
【図面の簡単な説明】
【図１】本発明の実施の形態例に係る階段構造を示す縦断面図である。
【図２】図１の要部の分解断面図である。
【図３】従来例に係る階段構造を示す縦断面図である。
【符号の説明】
１側板
２水平段部
２ｍ凹部
２ｎ凸部
２ｕ凹部
４踏み板
４ａ凹部
４ｂ凹溝
４ｃ凹溝
４ｕ凸部
４ｖ凹部
４ｔ前端面
６蹴込み板
９滑り止め
９ａ凸部
１２隙間
Ｎ１釘
Ｎ２釘[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a staircase structure used in a house or the like.
[0002]
[Prior art]
Conventionally, as a modification of the box-type staircase, a staircase called a “staircase” is often used. For example, as shown in FIG. 3, on the upper side of a pair of parallel side plates 1 and 1 arranged in an inclined manner, a plurality of horizontal step portions 2 previously formed by notches in a step shape are respectively provided with tread plates 4 in a tier shape. In addition, the lower end of the kick plate 6 that contacts the front end surface of the horizontal step portion 2 is fixed to the lower step plate 4 and the horizontal step portion 2 by being fixed with nails, wood screws, etc. (hereinafter referred to as nails). It is known that it is erected so as to be inserted between the front end surface and the upper end portion of which is fitted in a concave groove 4 a formed on the lower surface of the front end portion of the tread plate 4.
[0003]
[Problems to be solved by the invention]
However, the conventional step structure has the following problems. That is, (a) as shown in FIG. 3 where the finishing accuracy is low, when the tread plate 4 is installed on each horizontal step portion 2, the positioning 12 is difficult and the gap 12 remains generated if it is mounted out of position. There was a thing. This is because, unless the prepared hole for driving a nail or the like is completely drilled in the tread board 4, it is necessary to hit several times before the nail N1 or the like reaches the horizontal step portion 2 in the hammering. Even if the tread board 4 is pressed by hand, the tread board 4 is displaced from the fixed position due to the vibration of the hitting. The same was true for the electric screwdriver.
Note that fixing the treadle 4 by hand requires holding the treadle 4 with only one hand and holding the treadle 4 with the remaining one hand, forcing the worker to take an unreasonable posture, leading to greater worker fatigue and occupational accidents. The risk was high.
(B) Long nails are necessary to fix the tread.
The footboard 4 is often set to a thickness of 30 to 36 mm in consideration of strength. Accordingly, as shown in FIG. 3, the nail N1 and the like necessarily have a long length of 50 mm or more. However, long nails are expensive, and if the pilot holes are not drilled in advance, it takes a long time to drive, the resistance is large, and they are bent. On the other hand, in the case of wood screws, the screw head may be deformed and the driver groove may be crushed.
[0004]
Accordingly, an object of the present invention is to provide an inexpensive staircase structure that eliminates the drawbacks of the conventional examples, is easy to construct, has high finishing accuracy, does not require long nails, and the like.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the staircase structure according to the first aspect of the present invention includes a plurality of horizontal steps formed in advance in a step shape on the upper side of a pair of parallel side plates (1, 1) arranged in an inclined manner. Step plates (4) are respectively placed and fixed to the sections (2) in a stepped manner, and the kick plates (6) are connected to the rear end portions of the lower step plates (4) and the front end portions of the upper step plates (4). A step structure (2u) in which the rear end portion of the tread plate (4) is formed at the lower portion of the front end face of the horizontal step portion (2) on the upper step side. And a concave portion (4a) formed on the lower surface of the front portion of the tread plate (4) and a convex portion (2n) and a kick plate (6) formed on the upper surface of the front end portion of the horizontal step portion (2). And the lower end of the kick plate (6) is fitted in the groove (4b) formed in the upper surface of the rear part of the tread plate (4). It is an feature.
[0006]
Further, in the invention of claim 2, in addition to the configuration of the invention of claim 1, the convex portion (2n) formed on the upper surface of the front end portion of the horizontal step portion (2) forms a concave portion (2m) on the upper surface of the front end portion. In this way, the front part is a convex part (2n), and a concave part (4m) is formed in the concave part (2m) on the upper surface of the front end part and on the lower surface of the rear end part of the tread plate (4). A convex part (4u) generated between the concave part (4v) and the concave part (4a) formed on the lower surface of the front part of the tread plate (4) is fitted.
[0007]
Furthermore, in the invention of claim 3, in addition to the structure of the invention of claim 1 or 2, a nail (N2) or the like is directed toward the convex portion (2n) formed on the upper surface of the front end portion of the horizontal step portion (2). A recessed groove (4c) that can be driven is formed in the recessed groove (4c) formed on the upper surface of the front end portion of the tread plate (4) on the lower surface of the anti-slip (9) covering the front end portion and the front end surface of the tread plate (4). The projected part (9a) is configured to be detachably fitted.
[0008]
The symbols in parentheses described in the means for solving the above-described problems correspond to the symbols described in the drawings and embodiments of the invention described later.
[0009]
According to the first aspect of the present invention, the rear end portion of the tread plate is fitted into the concave portion formed in the front end surface of the upper horizontal step portion, and is horizontally disposed in the concave portion formed in the front lower surface of the tread plate. By fitting the convex portion formed on the upper surface of the front end portion of the step portion and the upper end portion of the kick plate, positioning of the tread plate with respect to the horizontal step portion is automatically performed with high accuracy. In addition, if the treadle is pressed toward the horizontal step by the operator's elbow or the like during construction, the displacement in the vertical direction is constrained, and the positioning of the placement on the horizontal step is made very accurately. Accordingly, the position of the kick plate is also determined without a gap.
[0010]
In order to fix the tread board to the horizontal step, the operator also holds the position / posture of a nail, etc. with one hand, hits (or turns) its head with the other hand, and pushes it into the horizontal step. In the meantime, since the tread is held as described above, it is not displaced and is fixed at an accurate position. Therefore, it is safe without forcing the worker into an unreasonable posture, and the worker's fatigue is small.
[0011]
In addition, since the thickness of the part where the recess is formed in the front part of the tread board and the rear part of the tread board is reduced by that much, it is possible to use nails etc. that are shorter and cheaper than conventional examples, and that much The indentation length is reduced, and nailing toward the horizontal step portion is facilitated.
[0012]
Further, according to the invention of claim 2, in addition to the function and effect of the invention of claim 1, since the convex part of the lower surface of the tread is fitted into the concave of the upper surface of the front end of the horizontal step part, the tread is positioned. Performed with higher accuracy.
[0013]
Furthermore, according to the invention of claim 3, in addition to the effects of the invention of claim 1 or 2, the thickness of the plate is further reduced by the concave groove formed on the upper surface of the front end portion of the tread board. Nails can be used, the push-in length is reduced accordingly, and nailing toward the horizontal step portion is facilitated. In addition, since the heads of the nails driven into the concave groove are covered by the fitting of the non-slip convex portions, the appearance is improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A staircase structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof, and FIG. 2 is an exploded sectional view of a main part of FIG.
[0015]
In the staircase structure according to the embodiment of the present invention, a plurality of horizontal step portions 2 formed in advance in a step shape on the upper side of a pair of parallel side plates 1 and 1 arranged in an inclined manner are respectively provided with tread plates 4. Is fixed in a nail or the like N2, and the kick plate 6 is erected between the rear end portion of the lower step plate 4 and the front end portion of the upper step plate 4. Is provided.
[0016]
The side plate 1 will be described. A concave portion 2m is formed on the upper surface of the front end portion of the horizontal step portion 2, a convex portion 2n is formed on the upper surface in front of the concave portion 2m, and the upper surface on the rear side of the concave portion 2m. Protrusions are formed. A recess 2u is formed in the horizontal direction at the lower part of the front end surface of the horizontal step 2 on the upper side so that the rear end of the tread plate 4 can be fitted. The recess 2u is chamfered so that the tread plate 4 can be easily attached.
[0017]
The tread 4 will be described. A recess 4a is formed on the lower surface of the front part, and a recess 4v is formed on the lower surface of the rear end part. As a result, a convex portion 4 u is formed between the concave portion 4 v and the concave portion 4 a formed on the lower surface of the front portion of the tread plate 4. Further, a concave groove 4b is formed on the upper surface of the rear portion of the tread plate 4, and a concave groove 4c is formed on the upper surface of the front end portion.
[0018]
And the convex part 2n formed in the front end part upper surface of the horizontal step part 2 and the upper end part of the kick board 6 are fitted by the recessed part 4a formed in the front part lower surface of the tread board 4, and the rear part upper surface of the tread board 4 is fitted. The lower end of the kick plate 6 is fitted into the formed concave groove 4b. Further, at this time, the convex portion 4 u formed on the lower surface of the tread plate 4 is fitted into the concave portion 2 m formed on the upper surface of the front end portion of the horizontal step portion 2.
[0019]
Further, a nail N2 can be driven into the concave groove 4c formed on the upper surface of the front end portion of the tread plate 4 toward the convex portion 2n formed at the front end portion of the horizontal stepped portion 2, and the concave groove 4c The convex portion 9a formed on the lower surface of the non-slip 9 that covers the front end portion of the tread plate 4 and the front end surface 4t is configured to be detachably fitted.
[0020]
According to the staircase structure configured as described above, the rear end portion of the tread plate 4 is fitted into the concave portion 2u formed on the front end surface of the horizontal step portion 2 on the upper step side, and the lower surface of the front portion of the tread plate 4 The protrusion 4n formed on the upper surface of the front end portion of the horizontal step portion 2 and the upper end portion of the kick plate 6 are fitted into the recess 4a formed in the above, so that the tread plate 4 can be positioned with respect to the horizontal step portion 2 with high accuracy. Is done automatically.
In addition, after the position adjustment in the width direction, if the tread plate 4 is pressed toward the horizontal step portion 2 by an operator's elbow or the like during construction, the displacement in the vertical direction is constrained and positioning of the placement on the horizontal step portion 2 is performed. Is made very accurately. Accordingly, the position of the kick plate 6 is also determined without a gap.
[0021]
In fixing the tread plate 4 to the horizontal step portion 2 with the nail N2, the operator holds the position / posture of the nail N2 etc. with one hand and holds the hammer (or driver) with the other hand. The head is struck (or turned) and pushed into the horizontal step portion 2, but during that time, the tread plate 4 is firmly held as described above, and thus is not displaced and is fixed at an accurate position. Therefore, it is safe without forcing the worker into an unreasonable posture, and the worker's fatigue is small.
During this time, the upper and lower ends of the kick plate 6 are fitted into the recess 4a of the upper step plate 4 and the groove 4b of the lower step plate 4 so as to contact the front end surface of the horizontal step portion 2. . Therefore, the finishing accuracy is high, and the kick plate 6 is not tilted or a gap is not formed between the front end surface of the horizontal step portion 2. Before that, nails N2 are driven into the recessed groove 4b of the tread plate 4 toward the horizontal step portion 2.
[0022]
Furthermore, since the thickness of the portion where the recesses 4a and 4v are formed in the front portion of the tread plate 4 and the rear portion of the tread plate 4 is reduced by that amount, the use of nails etc., which is shorter and cheaper than the conventional example, is used. Accordingly, the push-in length is reduced accordingly, and nailing toward the horizontal step portion 2 is facilitated.
[0023]
Further, the portion of the tread plate 4 where the concave groove 4c is formed has a plate thickness that is further reduced by the concave groove 4c, and it is possible to use a shorter and cheaper nail N2, and the pushing length is reduced accordingly. Nailing toward the horizontal step 2 is also facilitated. The head of the nail N2 driven into the concave grooves 4b and 4c is covered by the lower end portion of the kick plate 6 and the convex portion 9a of the anti-slip 9, so that it cannot be seen from the outside and the appearance is improved. .
[0024]
【The invention's effect】
According to the first aspect of the present invention, the rear end portion of the tread plate is fitted into the concave portion formed in the front end surface of the upper horizontal step portion, and is horizontally disposed in the concave portion formed in the front lower surface of the tread plate. By fitting the convex portion formed on the upper surface of the front end portion of the step portion and the upper end portion of the kick plate, positioning of the tread plate with respect to the horizontal step portion is automatically performed with high accuracy. In addition, if the treadle is pressed toward the horizontal step by the operator's elbow or the like during construction, the displacement in the vertical direction is constrained, and the positioning of the placement on the horizontal step is made very accurately. Accordingly, the position of the kick plate is also determined without a gap.
[0025]
In order to fix the tread board to the horizontal step, the operator also holds the position / posture of a nail, etc. with one hand, taps (or turns) its head with the other hand, and pushes it into the horizontal step. In the meantime, since the tread is held as described above, it is not displaced and is fixed at an accurate position. Therefore, it is safe without forcing the worker into an unreasonable posture, and the worker's fatigue is small.
[0026]
In addition, since the thickness of the part where the recess is formed in the front part of the tread board and the rear part of the tread board is reduced by that much, it is possible to use nails etc. that are shorter and cheaper than conventional examples, and that much The indentation length is reduced, and nailing toward the horizontal step portion is facilitated.
[0027]
Further, according to the invention of claim 2, in addition to the function and effect of the invention of claim 1, since the convex portion of the lower surface of the tread plate is fitted into the concave portion of the upper surface of the front end portion of the horizontal step portion, positioning of the tread plate can be performed. Performed with higher accuracy.
[0028]
Furthermore, according to the invention of claim 3, in addition to the function and effect of the invention of claim 1 or 2, the plate thickness is further reduced by the concave groove formed on the upper surface of the front end portion of the tread board, so that it is shorter and less expensive. Nails can be used, the push-in length is reduced accordingly, and nailing toward the horizontal step portion is facilitated. In addition, the nail heads driven into the concave grooves are covered by the fitting of the non-slip convex portions, so that the appearance is improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a staircase structure according to an embodiment of the present invention.
FIG. 2 is an exploded cross-sectional view of a main part of FIG.
FIG. 3 is a longitudinal sectional view showing a staircase structure according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Side plate 2 Horizontal step part 2m Concave part 2n Convex part 2u Concave part 4 Tread board 4a Concave part 4b Concave groove 4c Convex part 4u Convex part 4v Concave part 4t Front end face 6 Kicking board 9 Non-slip part 9a Convex part 12 Crevice N1 Nail N2 Nail

Claims

On the upper side of a pair of parallel side plates arranged at an angle, a step plate is placed and fixed in a plurality of horizontal step portions that are previously formed by notches in a step shape, and the kick plate is a lower step plate. The staircase structure is provided so as to be erected between the rear end portion and the front end portion of the upper step plate, and the rear end portion of the tread plate is formed below the front end surface of the upper horizontal step portion. And a convex portion formed on the upper surface of the front end portion of the horizontal stepped portion and an upper end portion of the kick plate are fitted into the concave portion formed on the lower surface of the front portion of the tread plate, and the rear portion of the tread plate A staircase structure in which a lower end portion of a kick plate is fitted into a concave groove formed on an upper surface.

The convex portion formed on the upper surface of the front end portion of the horizontal stepped portion is formed by forming a concave portion on the upper surface of the front end portion, thereby forming a front portion thereof as a convex portion. The staircase structure according to claim 1, wherein a concave portion is formed on the lower surface of the rear end portion of the tread plate, and a convex portion formed between the concave portion and the concave portion formed on the lower surface of the front portion of the tread plate is fitted.

A concave groove capable of driving a nail or the like toward the convex portion formed on the upper surface of the front end portion of the horizontal step portion covers the front end portion and the front end surface of the tread plate in the concave groove formed on the upper surface of the front end portion of the tread plate. The staircase structure according to claim 1 or 2, wherein a convex portion formed on a lower surface of the slip stopper is configured to be detachably fitted.