JPH0326830Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a mounting structure for treads on stairs, ladders, etc.

(b) Prior art and its problems Conventionally, the structure for attaching treads of stairs, etc. to side girders is that after fitting the tenon of the end of the tread into the groove formed on the inner surface of the side girder, Mounting structures have been proposed in which the end surface of the tenon of the tread is fixed with screws or nails from the outside surface of the girder, and in which the inner surface of the stringer and the bottom surface of the tread are tightly connected with L-shaped fittings, etc. The installation work was complicated, the fastened parts were likely to come loose, and the screw heads, nail heads, and L-shaped fittings were exposed, resulting in poor aesthetics.

For this reason, a mounting structure using adhesive has been proposed so as not to expose the fixing metal fittings, but this has the disadvantage that uneven adhesion or changes over time can create gaps, making the tread more likely to fall off, which is dangerous.

(c) Purpose of the invention The purpose of the present invention was made in view of the above-mentioned drawbacks, and is to provide a mounting structure for a footboard that is easy to work with, has an excellent appearance, and is safe.

(d) Structure of the invention In order to achieve the above-mentioned purpose, the mounting structure of the treadboard according to the invention includes a dovetail groove provided in the side girder and a dovetail tenon that can fit into the dovetail groove provided at the end of the treadle. In the tread mounting structure in which the tread plate is installed by inserting the dovetail groove, at least one of the bottom surface of the dovetail groove or the end surface opposite to the bottom surface of the dovetail tenon part,
A retaining metal fitting having a spring property and having a fixing protrusion at one end and a claw portion cut and raised on the opposite side of the fixing protrusion at the other end is fixed, and this retaining metal fitting is fixed to the above-mentioned one. The groove is held between the bottom surface of the groove and the end surface of the dovetail portion.

(E) Description of Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the attached drawings.

One embodiment of the present invention includes a stringer 1 and a tread plate 2.
and a retaining fitting 3.

That is, two side beams 1 are arranged diagonally in parallel so as to face each other, and dovetail grooves 4 with one end closed at an abutting portion 8 are appropriately provided in the horizontal direction at opposing positions.

The footboard 2 has dovetail portions 5 cut out at both ends thereof, which can be fitted into the aforementioned dovetail grooves 4. As shown in FIG. 4, the retaining metal fitting 3 is made by cutting a strip-shaped material having spring properties into a feather shape by press working, and bending one end to form a fixing protrusion 6. The other end is fixed to the fixing protrusion 6
The claw portion 7 is formed by bending it to the opposite side.

It should be noted that the shape of the retaining fitting 3 of this embodiment has the advantage that the number of processing steps is small and the yield is high.

Now, as shown in FIG. 2, a fixing protrusion 6 is driven into the bottom of the dovetail groove 4 of the side beam 1 to fix the retaining fitting 3. Then, when the dovetail portion 5 of the tread plate 2 is inserted into the dovetail groove 4 of the side girder 1, the end face of the dovetail tenon portion 5 presses the claw portion 7 of the retaining metal fitting 3 and is pushed down, so that the dovetail tenon portion 5 dovetail groove 4
It can be inserted up to the abutting part 8.

After insertion, when an external force is applied to the tread plate 2 in the direction opposite to the insertion direction, the claw portion 7 bites into the end face of the dovetail tenon portion 5 to prevent the tread plate 2 from falling out. Particularly, there is an advantage that the more external force is applied, the deeper the claw portion 7 bites into the tenon portion 5 and the more firmly the connection is made.

It should be noted that the retainer according to the present invention is not limited to the above-mentioned shape, and there are fixed positions for the retainer, and it is not limited to the bottom of the groove, but can also be installed on the end face or both sides of the dovetail. good. Furthermore, it goes without saying that an adhesive may be used for even more secure attachment.

(f) Effects of the invention According to the tread mounting structure of the invention, the retainer is fixed to at least either the bottom of the dovetail groove or the end face of the dovetail tenon, so the tread can be attached to the dovetail groove of the stringer. The tread can be firmly attached to the side girder simply by inserting the dovetail and tenon part, making the installation work easier and improving work efficiency.

Furthermore, since no adhesive is used, there is no need to worry about deterioration over time, and since the retainer is held between the bottom of the dovetail groove and the end of the dovetail tenon, there is no need to worry about it loosening and falling out. . Therefore, the retaining metal fitting always maintains the locked state between the stringer and the treadle, so there is no risk of the treadle falling off, and it is safe.

Further, according to the present invention, the retaining metal fittings are held between the stringer and the treadle and are not visible from the outside, so that it is possible to obtain a treadle mounting structure with good aesthetic appearance.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of an embodiment according to the present invention, FIG. 2 is an exploded perspective view of essential parts of an embodiment according to the present invention, and FIG. 3 is a partial sectional view of an embodiment according to the present invention. FIG. 4 is an explanatory diagram regarding the manufacture of a retaining fitting used in an embodiment of the present invention. 1... String girder, 2... Step board, 3... Retaining metal fitting,
4...Dovetail groove, 5...Dovetail tenon, 6...Fixing protrusion, 7...Claw part.

Claims (1)

[Scope of Claim for Utility Model Registration] A tread mounting structure in which a dovetail groove that can be fitted into the dovetail groove provided at the end of the tread plate is inserted into a dovetail groove provided on the side girder to attach the tread, On at least one of the bottom surface or the end surface of the dovetail portion facing the bottom surface,
A retaining metal fitting having a spring property and having a fixing protrusion at one end and a claw portion cut and raised on the opposite side of the fixing protrusion at the other end is fixed, and this retaining metal fitting is fixed to the above-mentioned one. A tread mounting structure characterized in that the footboard is clamped between the bottom surface of the groove and the end surface of the dovetail portion.