JPS5829748Y2 - stepladder - Google Patents

Description

[Detailed explanation of the idea] This invention relates to improvement of stepladders.

A stepladder has a ladder frame formed by attaching a plurality of treads between the leg pillars on both sides spread out at the bottom, and connects the upper ends of the pair of ladder frames to each other, allowing the legs of the ladder frame to be freely opened and folded. Commonly used.

The mounting structure of the tread between the pillars on both sides of a conventional stepladder is as follows:
As shown in Figures 4 and 5, the pillars 1 on both sides are arranged so as to spread out at the bottom, and the footboard 2 is formed slightly longer than the space between the pillars where it is to be installed. It has a structure in which an arc-shaped notch 3 circumscribing the pillar 1 is provided, the step board 2 is positioned between the pillars 1, and the fitting portion of the notch 3 and the pillar 1 is fixed by welding 4.

In the structure described above, the mounting strength of the tread plate 2 to the pedestal 1 is only by welding, and since the pedestal 1 on both sides is arranged with a wide bottom, no supporting force is generated for the tread plate 2, and therefore the tread plate 2 is The mounting strength, that is, the load supporting strength is weak, and there is a risk that the footboard 2 will fall off when you put your weight on it.

This idea was made in view of the above points, and the end of the tread is fitted externally to the pillar pillar, which is arranged so that the bottom part spreads out. The purpose of the present invention is to provide a stepladder that supports the treadboard on the pedestal using the pedestal, improves the load-bearing strength of the treadboard, and has excellent durability.

Embodiments of this invention will be described below with reference to FIGS. 1 to 3.

As shown in the figure, the stepladder 11 is formed by connecting the upper ends of a pair of ladder frames 12 and 12 with a pivot 13, and by means of a bending lever 14 connecting the lower parts, so that the legs of the ladder frames 12 and 12 can be opened and folded freely. ing.

The ladder frames 12 and 12 are constituted by pillars 15, 15 arranged on both sides so as to widen at the bottom, and a plurality of treads 16 attached between the pillars 15.15 on both sides.

The tread plate 16 is formed by using a band-shaped metal plate, bending the circumference downward as shown in Fig. 3, and processing the outer surface into a rough surface. It has a long length.

At both ends of the footboard 16, holes 17 are provided at positions slightly inward to fit the pillars 15. The holes 17 are fitted into the pillars 15, and the bottom floor of the pillars 15 on both sides is inserted into the hole 17. The footboard 16 and the pedestal 15 are fixed by means of welding 18 as shown in FIG. 3 at the position where they are supported by the sills.

The footboard 16a attached to the top end of the pillar 15 has a wider shape than the lower footboards, is connected to the other footboard 16a by a pivot 13, and has a top surface with a footboard for preventing the footing from slipping out and a square end insertion. A handle 19 is provided which can be used.

The stepladder of this invention has the above-mentioned structure, in which a footboard 16 is fitted into each of the pillars 15, 15 on both sides at a predetermined height position, and the pillars and the footboard 16 are externally fitted onto the pillar 15. Since the tread plate is fixed by welding along the circumference of the hole 17, the mounting strength of the tread plate to the pedestal can be increased by welding the fitting part and also by adjusting the lower part of the pedestal and preventing it from falling due to the fit of the holes. As a result, the load-bearing strength of the treadle is greatly improved, and there is no possibility of the treadle falling off, resulting in excellent durability.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the stepladder according to this invention, Fig. 2 is an enlarged cross-sectional plan view of the tread mounting part, Fig. 3 is a vertical cross-sectional front view of the same,
FIG. 4 is a cross-sectional plan view of a conventional stepladder, and FIG. 5 is a vertical cross-sectional front view thereof. 11 is a stepladder, 12 is a ladder frame, 13 is a pivot, 14 is a bending rod, 15 is a footpost, 16 is a tread, and 17 is a hole.

Claims (1)

[Scope of utility model registration request] A stepladder in which the upper ends of a pair of ladder frames with a plurality of treads attached between the pedestals on both sides are pivoted to each other so that the legs of both ladder frames can be opened and folded are arranged so that the bottom part spreads out on both sides. It consists of a pedestal and a plurality of treads that are installed at the required intervals vertically between the pedestals on both sides, and are installed at the inner position at both ends of each tread. Holes are formed at equal distances through which the pedestal passes through, and these holes are fitted externally into the pedestal, and each treadle is attached above and below between the pedestals, and the fitting portions of the pedestal and treadle are fixed by welding. A stepladder featuring