JPS5840239Y2 - Lifting prevention device for ladders - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a lifting prevention device for a ladder.

Conventionally, ladders installed on steel towers, etc., were left as they were after installation, which often led to unexpected accidents such as people climbing up the mountain out of curiosity and falling.

The present invention was devised with the purpose of preventing such accidents.

That is, the present invention provides a plurality of window holes of a certain length and a certain length at the same intervals as the horizontal bars of the ladder on each of the two long boards,
This one piece is installed and fixed on the surface of the ladder, and the other piece is slidably attached between the ladder and the fixing plate on the surface,
It is an object of the present invention to provide a lifting prevention device for a ladder, which prevents lifting by sliding the ladder when not in use to a position where it cannot be observed from the surface through the horizontal bar of the ladder.

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 shows the fixing plate 1 of the present invention fixed to the surface of a ladder 3, the sliding plate 2 being slidably set between the fixing plate 1 and the ladder 3, and the fixing plate 1 being a horizontal bar of the ladder 3. 4 and U bolt 6
FIG. 3 is a front view of the ladder lifting prevention device fixed by the ladder when it can be moved up and down.

In this case, it is observed that the window hole 5 of the fixed plate 1 is always open and the horizontal bar 4 of the ladder 3 crosses the back side of the window hole.

FIG. 2 is a plan view of FIG. 1, in which slide plates 2, also shown in FIG. 1, are installed between the fixed plate 1 and the ladder 3.
It is slidably provided between the poles 16.

As can be easily understood from FIG. 1, at least two bolt holes 8 are formed in the vertical direction at the lower end of the slide plate 2, into which the position fixing bolts 7 of the fixed plate 1 shown in FIG. 1 can be inserted. When the fixing bolt 7 is inserted into the first bolt hole 8 in the upper part, the horizontal bar 4 can be observed from the outside as shown in FIG.

Further, the bolt hole 8 is set at a position where the horizontal bar 4 cannot be observed from the outside when it is inserted into the lower second bolt hole 8 by sliding the window hole a certain distance.

(See Figures 5 and 6). FIG. 3 is an enlarged cross-sectional view taken along line AA' in FIG. 2, showing a state in which the fixing plate 1 is attached and fixed to the horizontal bar 4 of the ladder 3 by the U bolts 6 shown in FIGS. 1 and 2.

FIG. 4 is a perspective view of FIG. 1. In the state shown in FIGS. 1 and 4, the window hole is open and the horizontal bar 4 of the ladder can be observed from the outside. A person can hang his or her hands and feet on the horizontal bar 4 and move up and down.

Next, FIGS. 5 and 6 show the position fixing bolts 7 shown in FIGS. 1 and 4 being inserted and removed, the slide plate 2 raised, and the bolts 7 inserted into the second bolt holes of the slide plate 2. FIG. 2 is a front view and a perspective view showing a state in which a window hole 5 is seen through.

That is, FIGS. 5 and 6 show a state in which the slide plate 2 is raised and the horizontal bar 4 cannot be observed from the outside, in other words, the horizontal bar 4 is out of reach and there is no place to rest your feet, so it cannot be raised or lowered. This shows the state in which the

As described above, as can be easily understood especially from FIGS. 1 and 4, the position of the slide plate 2 is adjusted by inserting or removing the position fixing bolt 7 to the first bolt or the second bolt. By sliding and fixing, the ladder can be raised and lowered by grasping the horizontal bar 4 of the ladder when the ladder is being moved up and down (see Figures 1 and 4), and when not in use, the sliding plate 2 can be slid to the window hole 5. By shifting the horizontal bars by one interval and fixing them to the fixed plate 1, the horizontal bars 4 can be hidden from view from the outside through the window holes (see Figures 5 and 6), making it easy for outsiders to ascend and descend. It can be prevented, and its effects are enormous.

It should be noted that various other modifications of the present invention are conceivable.

For example, in the above embodiment, the fixed plate and the sliding plate were set only on one side of the ladder, but the same purpose could be achieved by providing the fixed plate on one side of the ladder and the sliding plate on the other side. .

It goes without saying that various modifications can be made to the mechanism for sliding the slide plate.

[Brief explanation of drawings]

Figure 1 is a front view of the present invention when one fixed plate and one sliding plate are provided on one side of the ladder and can be raised and lowered, Figure 2 is a plan view thereof, and Figure 3 is the same as Figure 2. FIG. 4 is a perspective view of FIG. 1, and FIGS. 5 and 6 are a front view and a perspective view, respectively, when the slide plate is slid and cannot be raised or lowered. be. 1... Fixed plate, 2... Slide plate, 3
...Ladder, 4...Horizontal bar, 5...
・Window hole, 6...U bolt, 7...position fixing bolt, 8...bolt hole.

Claims (1)

[Scope of utility model registration request] 1. In a ladder for climbing, two plates are provided on the ladder surface, and window holes are provided in these two plates at the same intervals as the horizontal bars of the ladder, and are large enough to easily grasp the horizontal bars when ascending and descending, and One plate is fixed to the ladder in a position with the window hole open so that the horizontal bar can be used, and the other plate is fixed to the ladder so that it can be slid between the ladder and the fixing plate, and the window hole is always fixed. is positioned so that it passes through the window hole of the fixed plate so that it cannot be raised or lowered, and when going up or down, the sliding plate is slid so that the window holes of the fixed plate and the sliding plate are in the same position and the horizontal bar is released. A climbing prevention device for a ladder, characterized in that the ladder can be raised and lowered. 2. At the lower end of the slide plate, at least two bolt holes are set in the longitudinal direction of the slide plate so that the position fixing bolts of the fixed plate can be inserted and removed freely, and the slide A request for registration of a utility model characterized in that the plate is slid up and down and the position fixing bolt is inserted through and inserted into any of the holes of the bolt so that the window hole of the fixing plate is opened or opened. The climbing prevention device for a ladder according to item 1.