JPS603278Y2 - folding ladder - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a folding ladder used for descending in an emergency.

Conventionally, rope ladders and the like have been used as ladders for descent in emergencies.

However, these ladders do not have enough rigidity to withstand bending in a direction perpendicular to the ladder surface, making them difficult to use as they swing back and forth or cause the feet to swing forward (see Figure 1).

The present invention aims to improve these drawbacks.

The present invention will be explained according to the drawings.

2, 3, and 4 show the ladder unit 10 as a whole.
shows.

This ladder unit 10 consists of two vertical bars 12.12 of equal length.
' and one horizontal bar 14 are combined in a U-shape with an opening at the top.

Upper end hole 16, 16' near the upper end of rain vertical bar 12, 12'
are drilled in parallel to the horizontal bars.

Protrusions 18 and 18' are provided near the lower ends of the rain vertical bars 12 and 12', respectively, so as to protrude perpendicularly to both the vertical and horizontal bars.

Lower end holes 20, 20' are bored in both protrusions 18, 18' in a direction parallel to the horizontal bar.

The folding ladder of the present invention is made by connecting a plurality of these ladder units.

In the example shown in Figure 5 and below, three ladder units IOA, I
It is made by connecting OB and IOC.

The length of the horizontal bar 14B of the ladder unit IOB is greater than the length of the horizontal bar 14A of the ladder unit IOA.
The horizontal bars of the vertical bars 12A and 12'A are more than twice as short as the width W measured in the parallel direction.

The length of the vertical bars 12B, 12'B of the ladder unit IOB is shorter than the length of the vertical bars 12A, 12'A of the ladder unit IOA by more than the width H measured in the vertical direction of the horizontal bar 14A of the ladder unit 10A.

Horizontal bar 14C1 of ladder unit 10C1 Vertical bar 12C,1
The length of 2C' has a similar relationship to ladder unit IOB.

The lower end holes 20A, 20'A of the ladder unit IOA and the upper end holes 16B, 16'B of the ladder unit IOB are connected to the protruding parts 18A, 1 B'A18B of both ladder units IOA, IOB.
, 18'B are rotatably connected using rivets or the like so that they face in the same direction.

The lower end holes 20B, 20'B of the ladder unit IOH and the upper end holes 16C, 16'C of the ladder unit IOC are similarly connected.

Further, a hook 30 is provided at the upper end of the rain vertical bar of the topmost ladder unit (IOA) on the opposite side of the protrusions 18A and 18'A.

This ladder is used as follows.

As shown in FIGS. 6 and 7, the ladder units 10A, IOB, and IOC are arranged in order from the top, and the hook 3
0 to the desired position, move up and down with your body on the side where the protrusion of the plane including the vertical bar and the horizontal bar is located.

In this way, for example, the horizontal bar 14 of the ladder unit IOB
If you put your feet on B, the horizontal bar 12 of the ladder unit 10B
B comes into contact with the horizontal bar 14A of the ladder unit 10A, so the horizontal bar 14B does not move in the opposite direction to the protruding direction of the protrusion 18A with respect to the vertical bar 12A.

The same applies when the foot is placed on the horizontal bar 14C of the ladder unit IOC.

In other words, when going up and down, the feet do not flow forward.

To fold this ladder, horizontal bar 1 of ladder unit 10C
4C in the protrusion direction of the protrusion 18C, and the upper end hole 16
It is rotated 180 degrees around C to obtain the state shown in FIGS. 7 and 8.

Next, the ladder unit IOB is similarly rotated 1800 times together with the ladder unit 10C to bring it into the state shown in FIGS. 9 and 10, and the folding process is completed.

At this time, the vertical bar 12C of the ladder unit IOC is shorter than the vertical bar 12B of the ladder unit 10B by more than the width H measured in the vertical direction of the horizontal bar 14B of the ladder unit IOB. It can be folded without coming into contact with the rod 14A.

As is clear from the above description, the protrusion of the lowest ladder unit and the upper end hole of the highest ladder unit are unnecessary and can be omitted.

Also, the spacing between the horizontal bars and the length of the horizontal bars are smaller for lower ladder units.

However, the total length is 7rn. A ladder unit of about 10 steps will not cause any practical inconvenience at all.

The folding ladder of the present invention has great practical effects, especially when used in areas that do not face a wall, since the feet cannot move forward when using it.

Therefore, it is suitable for applications such as being loaded onto a car in order to escape from an elevated expressway line to the ground in an emergency such as an earthquake.

[Brief explanation of the drawing]

Fig. 1 is an explanatory view showing how the rope ladder is used, Fig. 2 and the following drawings show an embodiment of the present invention, Fig. 2 is a perspective view of the ladder unit, Fig. 3 is a front view of the same, and Fig. Figure 4 is a side view of the folding ladder, Figure 5 is a front view of the same when the folding ladder is extended, Figure 6 is a side view of the same, Figure 7 is a front view of the same when the lowest step is folded, and Figure 8 is a front view of the same when the folding ladder is folded. A side view, FIG. 9 is a front view when diffraction folding is completed, and FIG. 10 is a side view of the same.

Claims (1)

[Scope of utility model registration request] Two vertical rods of equal length and one horizontal rod are connected in a U-shape with an opening at the top, and upper end holes are drilled near the upper ends of the rain vertical rods in the parallel direction of the horizontal rods. A number of ladder units are prepared in which protrusions are provided near the bottom end of the bar that protrude vertically to both the vertical bar and the horizontal bar, and lower end holes are drilled in both protrusions in a direction parallel to the horizontal bar. , at the bottom of the ladder unit 1, there is another ladder unit, the length of the horizontal bar is at least twice the width of the vertical bar measured in the parallel direction of the horizontal bar, and the length of the horizontal bar is shorter than that of the ladder unit 1; A ladder unit whose length is shorter than that of the first ladder unit by at least the width measured in the vertical direction of the horizontal bar is rotated through the lower end hole of the former and the upper end hole of the latter so that the protruding parts of both ladder units face the same direction. A folding ladder in which each ladder unit is connected in a row by being freely connected.