JP4735238B2 - Stair tread fixing structure - Google Patents

Description

  The present invention relates to a fixing structure for a step board of a staircase.

  Conventionally, for example, as illustrated in FIG. 5, a staircase called an open staircase that is constructed without providing walls 3 on one side or both sides to produce an open space is known (for example, Patent Document 1 below). See also).

  The open staircase in FIG. 5 is provided with a wall 3 only on one side, and a tread plate 1 is passed between a side plate 4 fixed to the wall 3 and a girder 2 provided opposite to the side plate 4. ing. Moreover, by providing no kick plate between the treads 1, a more open space effect is achieved.

In the construction of this open staircase, for example, as illustrated in FIG. 6, a rectangular fitting concave portion 11 is provided in the tread plate 1, and the girder 2 has a rectangular fitting convex portion 22 corresponding to the fitting concave portion 11. Often, the tread board 1 is attached to the girder 2 by providing the tread board insertion part 21 and inserting the tread board 1 into the tread board insertion part 21 of the girder 2 and fitting the fitting recess 11 and the fitting convex part 22 together. Has been done. At this time, the width dimension W1 of the fitting concave portion 11 is made larger than the width dimension W2 of the fitting convex portion 22 so as to provide a clearance in the width direction so that the fitting concave portion 11 and the fitting convex portion 22 can be easily fitted. ing.
JP-A-6-322917

  However, by providing the clearance in the width direction as described above, there is a problem in that the fixing strength between the footboard 1 and the girders 2 is reduced, and a creaking sound is generated due to deflection due to the load on the footboard 1. In order to solve this problem, it can be considered that the tread plate 1 is more securely fixed to the girder 2 by eliminating the clearance. In this case, the fitting concave portion 11 of the tread plate 1 and the fitting convex portion of the girder 2 are considered. 22 could not be easily fitted, and workability was difficult.

  In view of this, the present invention has an object to provide a fixing structure for a tread of a staircase that can securely attach and fix the tread to a girder and can easily perform the attaching operation.

In order to solve the above-mentioned problem, the staircase tread plate fixing structure according to the present invention is firstly provided with a fitting recess in the tread plate, and a wedge wedge-inserted notch portion and a wedge wedge formed in the girder. A tread plate insertion portion having a fitting convex portion composed of a body and a tread plate mounting convex portion is provided, and the tread plate is inserted into the tread plate insertion portion of the girder and the fitting concave portion and the fitting convex portion are fitted to each other. The tread board mounting convex part has a taper shape with a width dimension that decreases toward the front end face, and the wedge body on the fitting convex part is a fitting part of the tread board. It is press-fitted into the wedge body insertion notch so as to fill the gap formed between the joint recess and the tread plate mounting convex portion, and when the tread plate is inserted into the tread plate insertion portion, the rear surface of the wedge body is brought into contact with the fitting recess. The treadle is inserted Wherein the fitting the fitting recess so as to press-fit the follow wedge body wedge member insertion notch portion and the fitting convex portion.

According to the first aspect of the invention, when the foot plate is inserted into the tread plate insertion portion, the rear back surface of the wedge body is brought into contact with the fitting recess, and the wedge body is press-fitted into the wedge body insertion cut portion as the tread plate is inserted. By fitting the fitting concave portion and the fitting convex portion as described above, the tread plate can be securely attached to the girder and fixed, and the attaching operation can be easily performed. Further, the tread plate mounting convex portion has a tapered shape whose width dimension becomes smaller toward the front end surface, and the wedge body in the fitting convex portion is formed by the tread plate fitting concave portion and the tread plate mounting convex portion. By being press-fitted into the wedge body insertion cut portion so as to fill the gap formed therebetween, the tread plate can be more securely attached to the girder and fixed.

  The invention of the present application has the features as described above. Embodiments will be described below with reference to the drawings. FIG. 1 is a cross-sectional view for explaining a fixing structure of a footboard and a girder in the present invention. FIG. 2 is a perspective view showing a fixing structure of a tread board which is the right side portion of the stairs. The staircase tread plate fixing structure in the present invention is, for example, as shown in FIG. 5, a side plate 4 fixed to the wall 3 and a step plate of an open staircase in which a girder 2 is provided on the opposite side. The present invention is not limited to the fixed structure of 1, and the fixed structure of the step board of the staircase in which one girder 2 is located at the approximate center of the foot board 1 without being used in combination with the side plate 4 is also targeted.

  As shown in FIGS. 1 and 2, for example, as shown in FIGS. There is provided a tread plate insertion portion 21 having a fitting convex portion 22 composed of a wedge body 23 (not shown in FIG. 2) and a tread plate mounting convex portion 24 which are press-fitted there. When the tread board 1 is inserted into the tread board insertion portion 21 of the girder 2, the back surface 232 of the wedge body 23 is brought into contact with the fitting recess 11, and the wedge body 23 is inserted into the tread board 1 as the tread board 1 is inserted. The stepping plate 1 is fixed to the beam 2 by fitting the fitting concave portion 11 and the fitting convex portion 22 so as to be press-fitted into the wedge body insertion cut portion 25 along the direction. In addition, it is preferable to provide a clearance in the width direction so that the size of the fitting concave portion 11 of the tread plate 1 is slightly larger than the size of the fitting convex portion 22 of the girder 2. As a result, the footboard 1 can be easily inserted into the footboard insertion portion 21.

  More specifically, for example, as shown in FIG. 1, a wedge body insertion cut portion 25 is provided on the front end surface 242 of the tread plate mounting convex portion 24, and the wedge body 23 is press-fitted into the wedge body insertion cut portion 25. You may do it. As the shape of the wedge body 23, the cross section becomes smaller toward the tip portion 231, and the wedge portion insertion cut portion 25 is press-fitted from the tip portion 231. For example, as shown in FIG. 3, it may be a quadrangular frustum shape having a square cross-sectional shape and a gradually decreasing width dimension.

  It is considered that the wedge body 23 as described above has its tip portion 231 inserted into the wedge body insertion cut portion 25 in a predetermined amount in advance. That is, the tread plate 1 is inserted into the tread plate insertion portion 21 of the girder 2 in a state where a part of the tip portion 231 of the wedge body 23 is inserted into the wedge body insertion cut portion 25. As a result, when the foot board 1 is inserted into the foot board insertion portion 21 of the beam 2, the rear back surface 232 of the wedge body 23 is surely brought into contact with the concave surface 111 of the fitting recess 11, and the wedge body 23 is brought to the target position. It can be easily press-fitted. In addition, since the operation of inserting the foot plate 1 into the foot plate insertion portion 21 of the girder 2 while positioning the wedge body 23 at the position of the wedge body insertion cut portion 25 is very laborious, this operation should be easy. You can also.

  Therefore, it is considered that the width of the wedge body insertion cut portion 25 is cut with a width that allows the tip portion 231 of the wedge body 23 to be inserted in advance. The position of the wedge body insertion cut portion 25 and the length of the cut are particularly limited as long as the front end portion 241 of the tread plate mounting convex portion 24 bulges outward when the wedge body 23 is press-fitted. It is not something. In the present invention, a wedge body insertion cut portion 25 may be provided at one position on the front end surface 242 of the tread plate mounting convex portion 24, but one wedge body 23 may be used, but preferably, as shown in FIG. As described above, it is considered that the wedge body insertion cut portions 25 are provided at two locations on both ends of the front end surface 242 of the tread plate mounting convex portion 24 and the wedge bodies 23 are press-fitted into the respective wedge body insertion cut portions 25. . For example, when a wedge-shaped body having a quadrangular pyramid shape is used, the wedge body 23 is tapered in the longitudinal direction, so that the wedge body 23 is gradually press-fitted into the wedge body insertion cut portion 25. Accordingly, the right front end portion 241a and the left front end portion 241b of the tread plate mounting convex portion 24 expand outward along the wedge body 23, and the front end portion 241 of the tread plate mounting convex portion 24 bulges outward. To do. As a result, the fitting protrusion 22 formed by the wedge body insertion cut portion 25, the wedge body 23 pressed into the wedge body 23, and the tread plate mounting protrusion 24 is firmly fitted to the fitting recess 11. The tread board 1 is securely fixed to the beam 2.

  FIG. 4 shows a cross-sectional view showing another embodiment of the fixing structure of the tread of the staircase of the present invention.

  According to FIG. 4, the tread plate mounting convex portion 24 in the tread plate insertion portion 21 of the girder 2 has a width dimension that decreases toward the front end portion 241, and has a cross-sectionally tapered shape ( It can be said to be a quadrangular frustum shape.

  The wedge body insertion cut portion 25 is provided at a position adjacent to the tread plate mounting convex portion 24, and the wedge body 23 is disposed at a position facing the inner surface 243 of the tread plate mounting convex portion 24. Are inserted into the wedge body insertion cut portion 25 so as to fill a gap formed between the fitting recess 11 and the tread plate mounting protrusion 24.

  The shape of the wedge body 23 is not particularly limited as long as it is a shape that fills the gap formed between the fitting recess 11 of the footboard 1 and the footboard mounting convex portion 24. For example, it may be a quadrangular pyramid shape having a square cross-sectional shape and gradually decreasing in width toward the tip 231, and then the back surface 232 contacts the concave surface 111 of the fitting recess 11. And press-fitted. At this time, the inner side surface 233 of the wedge body 23 is press-fitted so as to be in contact with the inner side surface 243 of the tread plate mounting convex portion 24. Then, as the wedge body 23 is press-fitted, the wedge body 23 moves along the inner surface 243 of the tread plate mounting convex portion 24, so that the outer side surface 234 of the wedge body 23 is the inner wall surface 112 of the fitting recess 11. As a result, the fitting convex portion 22 composed of the wedge body insertion cut portion 25, the wedge body 23 press-fitted therein and the tread plate mounting convex portion 24 is firmly fitted to the fitting concave portion 11. Combined.

It is sectional drawing for demonstrating the fixation structure of the tread board and a girder in this invention. It is the perspective view which showed the fixing structure of the step board of the staircase of this invention. It is the perspective view which showed one Embodiment of the wedge body in this invention. It is sectional drawing for demonstrating the fixing structure of the step board of another staircase of this invention. It is the perspective view which showed an example of the open staircase. (A) It is the disassembled side view which showed the fixing structure of the tread board by a prior art. (B) It is the sectional view on the AA line of the tread board fixing structure of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tread board 11 Fitting recessed part 111 Concave surface 112 Inner wall surface 2 Girder 21 Tread board insertion part 22 Fitting convex part 23 Wedge body 231 Tip part 232 Rear back surface 233 Side face 234 Outer side face 24 Tread board attaching convex part 241 Front end part 241a Right front end part 241b Left front end portion 242 Front end surface 243 Inner side surface 25 Wedge body insertion notch 3 Wall 4 Side plate

Claims (1)

The tread plate is provided with a fitting recess, and the girder is provided with a tread plate insertion portion having a fitting protrusion composed of a wedge body insertion cut portion and a wedge body press-fitted therein and a tread plate mounting protrusion. It is a stair tread plate fixing structure in which the tread plate is inserted into the tread plate insertion portion of the girder and the fitting concave portion and the fitting convex portion are fitted to fix the tread plate to the girder, and the tread plate mounting convex portion is on the front end surface thereof The width of the taper is reduced as it goes, and the wedge body in the fitting convex part is inserted into the wedge body so as to fill the gap formed between the fitting concave part of the foot board and the convex part for mounting the foot board. When the treadle is inserted into the treadle insertion part, the rear back surface of the wedge is brought into contact with the fitting recess, and the wedge is pressed into the notch for inserting the treadle as the treadle is inserted. Mating concave and mating convex Fixing structure of treads of stairs, wherein the fitting and.

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