JPH0711230Y2 - Stair structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a stair structure using a plastic stair tread having a steel plate core.

(Prior art and its problems) In order to prevent slipping and muffling when climbing stairs,
A plastic mat is laid on the top of the tread. Usually, this type tread is fastened and fixed to the side plates at both ends with bolts, etc., and as shown in FIG. 6, the front side and the back side of adjacent treads 1 are connected to bear the load applied to the center of the tread. It is proposed to dispose the riser plate 2 through the insert groove of the plastic mat. However,
If the structural strength of the tread 1 is weakened by repeated use, there is a problem that the riser easily comes off from the insertion groove. Therefore, in Japanese Utility Model Laid-Open No. 61-78935, a clip is used to bite into and fix the insertion groove of a riser plate, but a plastic tread plate with a steel plate core plate cannot have a large plastic layer thickness. Therefore, the method of fixing the riser through the clip cannot be adopted. Further, the use of the clip is not only time-consuming, but also has a weak fixing force and cannot be reused once it is removed.

(Problems to be Solved by the Invention) An object of the present invention is to provide a staircase structure in which a riser plate can be reliably held in a plastic tread plate in which a steel plate core material is incorporated.

(Means for Solving the Problems) The present invention has a plastic stair tread having a steel plate core, which is integrally formed with a downward bent portion and an upward bent portion on the back side. An insertion groove that fits the upper end of the insert plate is formed, and an insert groove that fits the lower end of the riser plate is formed in the back side bent portion, and a plurality of cutout holes are provided on the back surface of the back side bent portion, On the rear surface of the lower end of the riser plate, there is an engaging protrusion that fits into each notch hole upwards and with a slight clearance downwards. With the lower end of the insert plate fitted, the notch holes and the engaging projections are engaged, and the upper end of the riser plate is fitted into the insert groove of the front side bent portion of the step plate at the upper end. Stepping plate at both ends via mounting flanges In the structure of the stairs and summarized in that the fastening fixed to the plate.

(Operation) According to the present invention, since the bent portions are formed on the front side and the rear side of the tread plate, it is possible to form the insertion groove sufficient for fitting the tread plate, and at the same time, the tread plate and the tread plate. Since the inner side groove is fitted and fixed by the unevenness, it is easy to insert and difficult to remove.

In addition, even if the center of the tread is subjected to a load and the tread flexes, the riser plate is firmly connected to prevent the warp from bending, improving the rigidity and strength of the tread and improving the elasticity of the tread. Deformation and permanent deformation can be prevented.

Hereinafter, the present invention will be described in detail based on specific examples shown in the accompanying drawings.

(Embodiment) FIG. 1 is an assembly view of a stair structure according to the present invention, FIG. 2 is a cross-sectional view of the assembled state, FIG. 3 is a cross-sectional view of a main part before a tread plate and a riser plate are combined, FIG. 4 is a cross-sectional view of an essential part after the tread plate and the riser plate are coupled, (a) showing a non-loaded state and (b) showing a loaded state.

In the drawing, reference numeral 1 is a tread, both ends of which are fixed to a mounting flange 31 welded and fixed to the inner surface of the side plate 3 by a bolt B and a nut (not shown) which are internally mounted. The plate 2 is attached.

More specifically, the tread plate 1 is a plastic stair tread plate containing a steel plate core material 11, and is manufactured by, for example, the method of Japanese Patent Application No. 63-161556. That is, the steel plate core material 11 is housed in a mold (not shown) and sandwiched with thermoplastic resin 12 from the upper and lower surfaces to form the core material. As shown in FIG. 2, the steel sheet core material 11 has its back end bent at an upper right angle and its front end bent at a lower right angle, and further has bolt insertion holes near both left and right ends of a longitudinally extending sectional recess. Is formed, and the upper and lower surfaces of the steel plate core material 11 are covered with the thermoplastic resin 12 with the bolt B inserted therein. The upper surface 12a covers the head of the bolt and is flush with the upper surface, and a non-slip wavy portion 13 is formed at the front end. In addition, the bent portion 14 at the front end projects downward, and the downwardly extending groove 16 is formed by the ridge 15 extending in the longitudinal direction behind the bent portion 14, while the slightly bent insertion groove 18 is formed at the back bent portion 17. Has been done. This insert groove
18 is divided into four in the longitudinal direction (see FIG. 5), a notch opening 19 is formed in each central portion, and the upper side 19a of the opening is inclined upward (see FIG. 3).

On the other hand, the riser plate 2 has its lower end portion 21 divided correspondingly to the above-mentioned divided insertion grooves, and upwardly inclined engaging marks 22 corresponding to the openings 19 are formed in the vicinity of the respective end portions (first 3 and 5), the opening of the insertion groove 18
The insertion force into 19 is small (see Fig. 4 (a)), but the removal force is large (see Fig. 4 (b)), and this lower end 21 is inserted into the insertion groove 18. At the same time as inserting and fitting, the upper end 23 is inserted into the downward groove 16 to be assembled. Therefore, although the assembling is easy, the riser plate 2 is prevented from coming off and noise can be prevented. Also,
In the above structure, since both ends of the tread are fixed to the side plates 3, the deflection of the tread due to the load is concentrated in the central portion, but since the riser 2 bears a part of this load, the strength of the tread is reduced. Will be improved.

(Effects of the Invention) As is apparent from the above description, according to the present invention, in a staircase in which a riser is fitted to a tread, the tread is fastened and fixed to side plates at both ends, and the front and back sides of the tread are fixed. A plastic with a steel plate core material inside, which forms a bent portion at an end that is substantially perpendicular to the surface of the tread plate and has a groove for insertion, and the lower end of the riser plate and the groove on the back side of the tread plate are fitted and fixed to each other by unevenness. Even with a tread plate, the bent part can be formed on the front side and the back side of the tread plate to form an insertion groove sufficient for fitting the riser plate, and at the same time, the riser plate and the tread plate rear side groove are fitted by unevenness. Since they are firmly fixed together, they are easy to insert but difficult to remove, so assembly is easy and detachment of the riser plate can be prevented. Moreover, since the load applied to the tread plate through the riser plate is borne, the strength of the load can be improved.

[Brief description of drawings]

FIG. 1 is an assembly drawing of a stair structure according to the present invention, FIG. 2 is a sectional view of the assembled state, FIG. 3 is a sectional view of essential parts showing a state of a riser plate before fitting with a tread plate, 4A and 4B are cross-sectional views of a main part showing a state after fitting the riser plate with the tread plate, where FIG. 4A shows a no-load state and FIG. FIG. 5 is a perspective view seen from the direction A in FIG. 1, and FIG. 6 is a perspective view showing a conventional staircase structure. 1 ... Treading plate, 2 ... Racing plate, 3 ... Side plate, 11 ... Steel plate core material, 12 ... thermoplastic resin, 14,17 ... Bending part, 18
...... Insertion groove, 19 ...... notch hole, 22 ...... engagement protrusion.

Claims (1)

[Scope of utility model registration request] 1. A plastic stair tread having a steel plate core material is integrally formed with a downward bent portion and an upward bent portion on the rear side, and the upper end of the riser plate is fitted to the front bent portion. An insertion groove is formed, and an insertion groove for fitting the lower end of the riser plate is formed in the back side bent portion,
A plurality of cutout holes are provided on the back side of the back side bent part, and an engagement protrusion that fits into each cutout hole upwards and with a slight clearance downwards is provided on the backside of the lower end of the riser plate. , Fit the lower end of the riser plate into the insertion groove of the rear side bent part of the lower step plate, engage each notch hole with the engaging protrusion, and insert the front side bent part of the upper step plate. A staircase structure in which each stepping plate is fastened and fixed to a side plate through mounting flanges at both ends in a state in which an upper end of the riser plate is fitted in the groove.