JP2571849Y2 - Tripod stepladder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tripod used on a construction site, a farm such as an orchard, and other work sites.

[0002]

2. Description of the Related Art Conventionally, tripod stepladders have been used in construction, orchards, and other work. It is composed of a pipe or a rod-shaped body having an appropriate outer peripheral surface, and is slippery at the time of work, and has a safety problem. Recently, there has been used a rod with an outer peripheral groove as a tread rod. However, when mud or the like adheres to the pipe, it may still be slippery. In addition, stepladders often work with feet on the treads, but since these treads are basically circular in circumference, the problem is that the feet become painful, especially if the weight is supported by such treads for a long time. There was also.

[0003]

SUMMARY OF THE INVENTION The present invention proposes a tripod stepladder which solves these problems. A pair of left and right leg rods each having an upper end attached to a front rod of an underframe and a vertical direction of a reinforcing rod thereof. A tripod comprising a ladder body having a tread frame and a support rod whose upper end is rotatably attached to a rear rod of the underframe. A step rod having a substantially planar upper surface and a flat rear surface, and an auxiliary rod attached to the rear surface, wherein a plurality of ridges or protrusions are formed in the longitudinal direction of the lower surface and the front surface of the step rod. It is effective to provide a concave stripe.

[0004]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
In FIGS. 1 and 2, (1) is a ladder body, and (2) and (2) are a pair of left and right leg rods constituting the ladder body, each of which has a shape curved and expanded laterally as it goes downward. The upper ends are respectively attached to both ends of the front rod (3a) of the rectangular underframe (3). The underframe (3) is provided with one or more (two in the figure) central rods (3b) (3b) at the center. (4) is a reinforcing rod provided substantially in parallel behind each of the leg rods (2) and (2), and the upper end is a side rod (3c) of the underframe (3).
And the lower end is attached to each lower end of the leg rods (2) and (2).

[0005] (5a)-(5f) is a pair of these legs (2)
(2) and a reinforcing rod (4). A rectangular step frame that is suspended at substantially equal intervals between the step (4), and a supporting rod (9) is provided at the center of the rear of the lowermost step frame (5f). A locking piece (6) for closing the leg is provided. (7) is a non-slip attached to the lower end of each of the leg rods (2) and (2) and the support rod (9);
(8) is a handle. (9) is a support rod having substantially the same length as the ladder body (1), and the upper end thereof is attached to the center of an outer tube (3d ') provided on the rear rod (3d) of the underframe (3). It is rotatably connected to (3d) and can be opened and closed. In addition, a work footrest (10) protrudes from the upper part of the support rod (9) as a handle.

The tripod thus constructed has a main member made of a lightweight metal tube made of aluminum or the like. The step frames (5a) to (5f) are further provided with the front legs as shown in FIG. Step rods (11a) to (11f) for connecting the rods (2) and (2)
And auxiliary U-shaped auxiliary rods (12a) to (12f) attached to the rear surfaces of the step rods (11a) to (11f).

That is, the step rod (11) has a hollow pipe shape, the upper surface of its outer peripheral surface is a substantially flat surface having a plurality of ridges (13) in the longitudinal direction, and the auxiliary rod (12) has a substantially U-shape. It consists of a bent round pipe and is welded and fixed to both ends of the flat rear surface of the step rod (11). And this step frame (5)
Is to fix both ends of the step rod (11) to the leg rods (2) and (2) by welding, and to weld and fix the two bent portions of the auxiliary rod (12) to the reinforcing rods (4) and (4). is there.

As described above, since the upper surface of the step rod (11) on which the worker places his / her foot is substantially flat, the area on which the foot is placed is widened, and the work can be stably performed. Further, according to such a step rod, the foot comes into contact with a large number of ridges, so that it becomes less slippery than in the past. Further, by making the upper surface of the step rod (11) and the upper surface formed by the bent auxiliary rod (12) coplanar, the scaffold is more stable and work is safe.

Since the rear surface of the step rod (11) is flat, the workability of welding the auxiliary rod (12) is improved as compared with the conventional operation of welding the auxiliary rod to a round pipe. . Furthermore, the cross section of the step rod (11) is
When abutting on (2) and welding, the cross section of the step rod (11) has many straight portions, so that the cross section of the round pipe is changed to the round pipe-shaped leg rod (2) (2) as in the related art. Work efficiency is improved compared to butting and welding.

The step rod (11) can be provided with a non-slip effect when it is gripped by hand by providing the lower surface and the front surface of the step rod (11) with ridges in the longitudinal direction as shown in FIG. Also, as shown in FIG. 1 and FIG.
When the center rod (3b) is a tube with an outer peripheral groove, the effect of preventing slippage can be further improved when the body is held by hand and used as a scaffold.

In the above embodiment, the step rod is provided with a ridge on the outer surface. However, as shown in FIG. 4, a plurality of ridges (14) may be provided in the longitudinal direction of the outer surface.

[0012]

As described above, according to the present invention, the working efficiency at the time of manufacturing the tripod is improved, the product quality is improved, and the user can work stably at a high place.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an explanatory view of a relevant part.

FIG. 4 is a sectional view showing another example of the step rod used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladder body 2 Leg rod 3 Underframe 3a Front rod 3b Center rod 3c Side rod 3d Rear rod 4 Reinforcement rod 5,5a-5f Step frame 6 Locking piece 7 Non-slip 8 Handle 9 Support rod 10 Working footrest 11 , 11a-11f Step rod 12, 12a-12f Auxiliary rod 13 Convex ridge 14 Concave ridge

Claims (2)

(57) [Scope of request for utility model registration] 1. A ladder body having a pair of left and right leg rods each having an upper end attached to a front rod of an underframe and a tread frame vertically separated from a reinforcing rod thereof, and an upper end being rotated by a rear rod of the underframe. A step rod having a substantially flat upper surface and a flat rear surface provided with a plurality of ridges or recesses in a longitudinal direction, the step rod being attached to the rear surface; A tripod characterized by an auxiliary rod. 2. A tripod according to claim 1, wherein a plurality of ridges or ridges are provided in the longitudinal direction of the lower surface and the front surface of the step rod.