JPH0711781A - Stepladder for erection work scaffold - Google Patents

Abstract

PURPOSE:To prevent a head from being struck against a supporting pipe and reinforcement pipe resulting in injury when climbing a stepladder, and also to reduce a cost and facilitate installation operation by enabling replacement of step plates and reduce weight for easiness of transportation. CONSTITUTION:Side plates 1 constitute inclined parts of a stepladder, and side plate pieces 2 extending to the side are connected to their lower end through connection plates 3. Multiple step plates 9 are installed detachably between the side plates 1 at specified intervals with bolts 13. The side plates 1, side plate pieces 2, and step plates 9 are formed of light-weight aluminum. A lower scaffold plate 16 is installed so that it is connected to the top end of the stepladder. Thus a worker M can climb the stepladder without striking his head on a reinforcement pipe 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder for erection work scaffolds arranged around a building.

[0002]

2. Description of the Related Art Conventionally, as a ladder for scaffolding for construction work, FIG.
The following are known. That is, the plurality of steel treads 21 are attached to the lower surface of the support leg 2
Along with the two, they are welded and fixed on the pair of left and right side plates 23 at predetermined intervals. The engaging hook 24 has an inverted J-shape, and is engaged with a connecting pipe 26 provided between the support pipes 25.

The scaffold plates 27, 28 are mounted and supported on the connecting pipe 26 by hooks 29 connected to the ends thereof, and are arranged in the lateral direction. The worker M rests on them and moves to perform the work. ing. The scaffold plates 27 and 28 are provided at the lower and upper positions of the ladder. Further, as shown in FIG. 8, the reinforcing pipe 30 is formed in an inverted U shape, is welded to the pair of left and right support pipes 25, and is connected to the connection pipes 26 provided between the support pipes 25 via the connection plate 31. Are welded together. Then, the worker M moves from the lower scaffold plate 27 to the upper scaffold plate 28 via the ladder.

[0004]

However, the height of the frame constituted by the support pipe 25 and the connecting pipe 26 is usually about 160 to 180 cm, and the reinforcing pipe 30 is provided inside the frame. It is provided in a curved shape. Therefore, as shown in FIGS. 7 and 8, when the worker M puts his foot on the footboard 21 at the bottom of the ladder from the footboard 27 at the bottom to step diagonally upward, he strikes his head against the reinforcing pipe 30. There was a problem that it could get injured.

Further, since the tread plate 21 is joined and fixed to the side plate 23 by welding, if the tread plate 21 is damaged, there is a problem that the tread plate 21 cannot be replaced with a new one. Moreover, since the ladder is made of steel and heavy, it is not easy to carry, the transportation cost is increased, and the operation of mounting the ladder on the connecting pipe 26 is difficult.

The present invention has been made by paying attention to the problems existing in the prior art. It is an object of the present invention to provide a ladder for a scaffolding for erection work, which can prevent an injury by hitting a head on a support pipe or a reinforcement pipe when climbing stairs. Another object of the present invention is to provide a ladder for erection work scaffolding, in which the treads can be replaced, the weight can be reduced, the transportation can be facilitated to reduce the cost, and the mounting operation can be facilitated.

[0007]

In order to achieve the above object, the ladder for erection work scaffolding according to claim 1 is engaged with a scaffolding frame arranged around a building in a vertical position. In the ladder for construction work scaffolding, which is constructed obliquely and in which a plurality of treads are arranged at a predetermined interval in the middle part, and is movable from the lower scaffolding plate to the upper scaffolding plate, the lower scaffolding plate is And an upper part of the scaffold plate, and an inclined part arranged obliquely between the upper part and the upper part of the scaffold plate, and an extending part extending laterally from the lower end of the inclined part and connected to the lower part of the scaffold plate.

According to a second aspect of the present invention, in the first aspect of the present invention, the inclined portion is configured by arranging step plates at a predetermined interval between a pair of left and right side plates, and The step board is detachably attached to the side board. Further, in the invention described in claim 3, in the invention described in claim 2,
At least the step plate and the side plate are made of lightweight metal, the inclined portion and the extending portion are separately formed, and the inclined portion and the extending portion are connected by a connecting member.

[0009]

The ladder for scaffolding for erection work according to the present invention is provided with an extending portion extending laterally from the lower end of the inclined portion. Therefore, when the worker climbs up the ladder, the worker first puts his / her foot on the extension part and moves sideways to move the worker's head away from the support pipe and the reinforcement pipe, and then put the foot on the tread above it. And move diagonally upward. Therefore, the worker is prevented from hitting his / her head on the support pipe or the reinforcing pipe to be injured.

If the footboard is removably attached between the pair of left and right side boards, the footboard can be replaced if the footboard is damaged. Moreover, at least the step plate and the side plate are made of lightweight metal such as aluminum, and the inclined portion and the extending portion are separately formed, and the both are connected by the connecting member. In this case, the weight of the ladder is reduced, the transportation is facilitated, the cost is reduced, and the mounting operation is facilitated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 4, a pair of side plates 1 constitutes an inclined portion, and a side plate piece 2 as a laterally extending extending portion is cut and formed at a lower end thereof at a predetermined inclination angle to form a connecting plate 3. It is fastened by bolts 4 via. Side plate 1
The side plate piece 2 is made of aluminum for weight reduction,
The connecting plate 3 is made of stainless steel to maintain strength. A hook 5 made of stainless steel having a substantially U-shaped engaging portion 5a at its tip has its base end fastened to the upper end of the side plate 1 and the lower end of the side plate piece 2 with bolts 6. The engaging portions 5a of the hooks 5 are engaged with the upper and lower connecting pipes 8 connected between the support pipes 7 at the upper and lower positions, respectively. The support pipe 7, the connecting pipe 8 and the like form a scaffolding frame.

As shown in FIGS. 2 and 3, the step plate 9 as a step plate is made of aluminum and its front and rear edges are bent, and its upper surface is formed into a concave-convex surface 10 to have a reinforcing structure. Moreover, it functions as a non-slip when people step on it. The bolt seat 11 is formed in an arcuate cross section, and is integrally formed on the back surface of the step plate 9 so as to extend in the width direction.

The reinforcing channels 12 are fitted on both sides of the step plate 9, and in this state, the bolts 13 are passed through the mounting holes 14 formed through the side plate 1 and the through holes of the reinforcing channels 12 to insert the bolt seats of the step plate 9. The step plate 9 is attached and fixed to the side plate 1 by being tightened to 11. The bolt seat 11 also has a function of reinforcing the step plate 9.

The scaffold plates 15 and 16 are mounted and supported by the connecting pipe 8 by the hooks 17 connected to the ends thereof and arranged in the lateral direction, and the worker M is placed on them to move and perform work. ing. The scaffold plates 15 and 16 are provided at the lower position and the upper position of the ladder. Further, the reinforcing pipe 18 is provided on the upper portion of the support pipe 7 in the same shape as the conventional one.

When the worker M moves from the lower scaffold plate 15 to the upper scaffold plate 16, the worker M climbs up the ladder. In this case, the worker M puts one foot from the lower scaffolding plate 15 on the step plate 9 of the laterally extending portion at the lowermost end, and then puts the other foot on the step plate 9 thereon. At this time, the position of the head of the worker M only moves laterally when the first step is taken, and the vertical position does not change, and becomes higher when the second step is advanced thereafter. Therefore, as shown in FIG. 1, the head of the worker M is held at a position where it does not contact the reinforcing pipe 18 at the upper position. Therefore, the worker M is the upper reinforcement pipe 1
There is no risk of hitting the head on the 8 and injury during work is prevented.

Further, the side plate piece 2 of the extension part and the side plate 1 of the inclined part.
Since the and are configured as separate bodies, and the two are connected by the connecting plate 3, it is possible to easily manufacture each member and ensure a predetermined strength. In addition, since the step plate 9 is replaceably attached between the pair of left and right side plates 1 by the bolts 13 instead of welding, the step plate 9 can be easily replaced when the step plate 9 is damaged. Furthermore, since the components such as the side plate 1 and the step plate 9 are made of aluminum, which is a lightweight metal, the weight is reduced, the transportation is facilitated, the cost is reduced, and the mounting operation is performed. Will be easier. Moreover, there is no risk of rust such as iron.

The present invention is not limited to the above-described embodiments, but may be embodied by arbitrarily changing the configuration as follows, for example, within the scope of the gist of the invention. (A) The length in the front-rear direction of the step plate 9 in the extending portion is configured to be longer than the length of the other step plates 9. (B) A lightweight material such as an aluminum alloy should be used as the material of the components that make up the ladder. (C) The frame body is composed of the support pipe 7 and the connecting pipe 8 without providing the reinforcing pipe 18.

[0019]

As described above in detail, according to the present invention,
It has the following excellent effects. That is, when climbing the stairs, it is possible to prevent the head from hitting the supporting pipe or the reinforcing pipe to be injured. In addition, the footboard can be replaced, and the weight can be reduced to facilitate transportation, reduce the cost, and facilitate the mounting operation.

[Brief description of drawings]

FIG. 1 is a front view showing a ladder for erection work scaffolding according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a step plate of the same embodiment.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view showing a connecting plate.

FIG. 5 is a front view showing a conventional ladder.

FIG. 6 is a side view showing the same conventional ladder.

FIG. 7 is a front view showing a state in which a ladder is attached.

FIG. 8 is a side view showing a state in which a ladder is attached.

[Explanation of symbols]

1 ... Side plate as inclined part, 2 ... Side plate piece as extended part,
3 ... Connecting plate as connecting member, 9 ... Step plate as stepping plate, 15 ... Lower scaffolding plate, 16 ... Upper scaffolding plate.

Claims (3)

[Claims] 1. A scaffolding frame at the lower part of a scaffolding frame, which is engaged with the scaffolding frame arranged around the building and is vertically installed so that a plurality of treads are provided at predetermined intervals in the middle part. In a ladder for erection work scaffolding configured to be movable from a plate to an upper scaffolding plate, an inclined portion arranged obliquely between the lower scaffolding plate and the upper scaffolding plate, and a lower end of the inclined portion. A ladder for erection work scaffolding, characterized in that it has a laterally extending portion extending to the scaffolding plate at the bottom. 2. The inclined portion is configured by disposing a tread plate at a predetermined interval between a pair of left and right side plates, and the tread plate is detachably attached to the side plate. The ladder for erection scaffolding according to claim 1. 3. At least the step plate and the side plate are made of lightweight metal, the inclined portion and the extending portion are separately formed, and the inclined portion and the extending portion are connected by a connecting member. The ladder for scaffolding for construction work according to claim 2.