JP2001140567A - Stepladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the drop of a worker by allowing the worker to recognize the outer edge sections of a tread face during the work on a stepladder. SOLUTION: This stepladder 1 is provided with a tread member 2 and leg sections 3, 4, and the outer edge sections 52, 62, 72, 82 are pushed up by springs S. Tilt plates 5, 6, 7, 8 are provided on the outer peripheral edges of the upper face 22 of the tread member 2 so that they are made flat when applied with a load, and lugs 9 are provided on the upper face 22 of the tread member 2 along the inner edge sections 51, 61, 71, 81 of the tilt plates 5, 6, 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a stepladder with fall protection.

[0002]

2. Description of the Related Art A conventional stepladder used for attaching members to a ceiling and other operations has a flat tread surface, and when an operator is working with the stepladder facing upward, the outer edge of the treadle is not supported. I can not recognize the department.

[0003]

In the case of work using such a stepladder, the height of the work is at most about 2 m, so that the worker is not conscious of working at a height, and the height is less than 2 m. In this case, it is not mandatory to wear a lifeline, and accidents of falling due to stepping on the tread surface have been occurring at a high probability.

[0004] It is an object of the present invention to provide a stepladder with fall protection so that even during work on a stepladder, the worker can recognize the outer edge of the tread surface to prevent the worker from falling. It is in.

[0005]

According to the present invention, there is provided, in accordance with the present invention, a stepladder provided with a plurality of legs on a tread member, the outer edge of which is pushed up by a spring. An inclined plate provided on the outer peripheral edge of the upper surface of the tread member so as to become flat when a load is applied, and a convex body provided on the upper surface of the tread member along the inner edge of the inclined plate. A fall protection stepladder is proposed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a stepladder with fall protection according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

Referring to FIGS. 1 and 2, a stepladder 1 with fall protection is provided on a lower frame 21 of a tread member 2 made of aluminum and having a flat upper surface 22, and a pair of legs 3, 4 also made of aluminum. Is attached. The tread plate member 2 is an elongated plate-shaped member, and the upper surface 22 of the tread plate member 2 is a tread plate surface on which an operator rides.

[0009] An operator working on the tread member 2 does not pay special attention to his or her feet, and the tread member 2
In order that the outer edge 22A of the upper surface 22 can be perceived only by the sense of the sole over the entire circumference, the tread member 2
The inclined plates 5 to 8 are provided along the outer peripheral edge of the upper surface 22.

[0010] The inclined plate 5 has an inner edge portion 51 having a tread plate member 2.
The upper edge 22 of the spring S is swingably hinged, and its outer edge 52 is elastically urged upward by a spring S. Therefore, when a load is applied to the inclined plate 5, the outer edge 52 of the spring S It is configured to be pressed down against a force to be made substantially the same plane as the upper surface 22. The other inclined plates 6, 7, and 8 have exactly the same configuration.

A large number of hemispherical projections 9 are provided on the upper surface 22 of the tread plate member 2 as convex bodies along the inner edges 51, 61, 71, 81 of the inclined plates 5 to 8, respectively. When the worker steps on these projections 9, the worker can recognize that the foot of the worker is located near the outer edge of the tread plate member 2 through the sense of the sole of the foot. Therefore, it is effective and desirable that the position of the projection 9 be about half a foot from the outer edge of the tread plate member 2.

Since the stepladder 1 is constructed as described above, when an operator works on the stepping plate member 2 of the stepladder 1, the protrusions 9 arranged near the outer edge of the upper surface 22 of the stepping plate member 2. When the foot is put on the sole, the sole of the foot receives a feeling of oppression, so that even if the user concentrates on the work, it is possible to easily recognize that his / her foot is near the outer edge of the upper surface 22 of the tread plate member 2, A fall can be effectively prevented.

Further, since the inclined plates 5 to 8 are provided so as to surround the outer edge of the upper surface 22 of the tread plate member 2, when the worker's foot is applied to the outer edge of the upper surface 22, the load is applied to the inclined plates 5 to 8.
At least one of them changes from the inclined state to the planar state. By appropriately setting the spring force of the spring S, it is possible for the operator to feel this change at the sole of the foot. It is possible to effectively prevent a person from accidentally stepping off the tread plate member 2 and falling down due to concentration on the work. In addition, the inclined plates 5 to 8 provided along the outer peripheral edge of the tread plate member 2 can be formed by directly bending the outer peripheral edge of the tread plate member 2 to form an inclined plate.

In this embodiment, the configuration in which the projections 9 are provided in addition to the inclined plates 5 to 8 has been described, but a configuration in which only one of them is provided may be adopted.

Further, the projection 9 is a piezoelectric sensor, and a buzzer or the like is operated by a signal from the piezoelectric sensor generated when the operator steps on the projection 9 to output an alarm to notify the operator that there is a risk of stepping off. A configuration can also be used.

Further, at least one of the inclined plates 5 to 8 is provided.
Activate the limit switch in response to one stepping,
It is also possible to adopt a configuration in which a buzzer or the like is operated by the operation of the limit switch to output an alarm to notify the worker that there is a risk of stepping off.

[0017]

According to the present invention, it is possible to easily and surely know that the foot is on the outer edge portion of the tread plate member by the feel transmitted to the foot without the operator visually observing the tread plate member. The worker can concentrate on the work, can protect himself from a fall accident caused by stepping off, and can significantly reduce a disaster caused by stepping off.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a stepladder with fall protection according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stepladder 2 Stepping board member 3, 4 Leg part 5-8 Inclined board 9 Projection 22 Top surface 22A Outer edge 51, 61, 71, 81 Inner edge S Spring

Claims (1)

[Claims] 1. A fall protection stepladder comprising a plurality of leg portions provided on a tread plate member, wherein an outer edge portion is pushed up by a spring and an outer peripheral edge of an upper surface of the tread plate member becomes flat when a load is applied. A stepladder provided with a fall protection, comprising: an inclined plate provided on the upper surface of the tread member along an inner edge of the inclined plate.