JP4421093B2 - Ladder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ladder mainly used for evacuation and work, and more specifically, relates to a ladder that is folded and compacted for storage and is expanded and suspended for use.
[0002]
[Prior art]
As a conventional ladder for the above-mentioned use, as shown in Japanese Patent Laid-Open No. 53-41099, a foot pedal is installed with a space between a pair of parallel ropes, and legs are extended from both ends of each foot rod. It is known that the heel protrudes in a direction perpendicular to both the foot pedal and the rope.
[0003]
When this ladder is suspended along the vertical wall surface of the building, the toes will be perpendicular to the wall surface, and the footpads will be separated from the wall surface, so that you can hang your feet on the toes securely. it can. In addition, when a foot is placed on the footpad, the entire weight of the person who moves up and down acts on the rope, and no force is applied to the footpad. Can be secured.
[0004]
However, for example, when a conventional ladder is installed on an inclined surface in a water pipe in order to perform inspection / repair work in a large water pipe of a hydroelectric power station, as shown in FIG. It becomes a form supported by the leg pad 92, and the standing form of the leg pad is unstable. Therefore, when the entire weight of the person who goes up and down is applied to the foot rod, the force is distributed to the rope and the foot rod, the foot rod falls and the foot rod touches the inclined surface, and as a result, it becomes difficult to move up and down. .
[0005]
[Problems to be solved by the invention]
The present invention has been developed in view of the above circumstances, and an object of the present invention is to provide a ladder that can easily move up and down even when used on an inclined surface as well as a vertical surface.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a large number of foot rods are installed between the parallel left and right ropes at intervals in the longitudinal direction of the ropes, and the foot rods are suspended from the wall surface when suspended along the wall surface. In a ladder that protrudes from the both ends of the footpad and forms a U-shaped unit with the footpad and a pair of left and right footpads, every other unit is connected in a chain. It is characterized by being.
[0007]
The number of linkages connecting the two units is not limited. In addition, the linkage may connect either the foot rods or the leg rods. When connecting the foot pedals, it is advantageous that the left and right ends of the attachment positions of the linkages are not obstructive when the feet are put on, rather than the center portion of the width. In addition, a plurality of linkages may be arranged on either the left or right side along the longitudinal direction of the rope, but in this case, the weight balance applied to both ropes when suspended is biased to one side. In order to make the weight balance equal to the left and right, two continuous units are symmetrically connected to the left and right of two adjacent units, or the longitudinal direction of the rope as in the invention of claim 2 An example is one in which the reams are arranged symmetrically alternately left and right. If the latter is used, it is possible to reduce the number of reams used while making the weight balance equal to the left and right.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the ladder of the present invention is provided with a pair of ropes 1, 1 parallel to each other with a space left and right, and a plurality of U-shaped units 2 between the ropes 1, 1. It is constructed with a certain interval in the longitudinal direction, and adjacent units 2 and 2 are alternately connected to each other in a symmetrical manner on the left and right side by a linkage 3.
[0009]
Each unit 2 is composed of a foot rod 4 installed between the ropes 1 and 1 and a leg rod 5 protruding from the left and right ends of the foot rod 4 in a direction perpendicular to the longitudinal direction of the rope 1. .
[0010]
The structure in which the foot rod 4 is connected to the rope 1 is a general structure. For example, the foot rod 4 has cylindrical insertion portions 6 at the left and right ends thereof, and the ropes 1 passed through the insertion portions 6 are respectively connected. Connect with bolts and nuts.
[0011]
The mounting method of the linkage 3 will be described in detail. The uppermost linkage 3 is connected between the right ends of the adjacent foot rods 4 and 4, and the lower linkage 3 is connected to the adjacent foot rods 4 and 4. 4 is connected between the left end portions of the four, and the lower linkage 3 is connected between the right end portions of the adjacent foot rods 4 and 4, and the linkage 3 is connected in the same manner. The linkage 3 is connected with bolts and nuts.
[0012]
Each unit 2 and the linkage 3 use a rigid body, and a metal is an example of a specific material. Moreover, the shape of the linkage 3 is not limited. As an example, a flat plate, an angle plate, etc. are mentioned.
[0013]
When the ladder of the present invention described above is suspended along the inclined wall surface 7, the four leg rods 5 stand on the wall surface 7 and the footpad 4 is separated from the wall surface.
[0014]
【The invention's effect】
When the ladder of the invention according to claim 1 is suspended along the inclined surface, since the two units are integrated in a continuous manner, the two units are standing on the wall surface with four leg rods, Unit standing is stable. Therefore, even if it is used on an inclined surface, the footpad does not fall down and the footpad can be kept away from the wall surface, so that smooth elevation can be ensured. In addition, every other unit is connected in a chain, so that the rope can be folded at the unconnected portion to make the whole compact, and the storability is maintained.
[0015]
In the ladder according to the second aspect of the present invention, the linkages are arranged symmetrically alternately on the left and right along the longitudinal direction of the rope, so that the weight balance of the left and right as a whole is reduced while reducing the number of linkages used. Can be kept even. Therefore, even when the rope is extended by long-term use, the right and left ropes are evenly extended, and the entire balance is maintained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a usage state of a ladder according to the present invention.
FIG. 2 is a perspective view showing a conventional ladder.
[Explanation of symbols]
1 rope 2 unit 3 continuous rod 4 foot rod 5 leg rod 7 wall surface

Claims (2)

When a large number of foot rods (4) are installed between the parallel left and right ropes (1, 1) at intervals in the longitudinal direction of the rope (1) and suspended along the wall surface (7) The foot rod (5) that separates the foot rod (4) from the wall surface (7) protrudes from both ends of the foot rod (4), and the foot rod (4) and a pair of left and right leg rods (5, 5) In the ladder that formed the U-shaped unit (2),
Adjacent units (2, 2) are connected to each other by a chain (3). The ladder according to claim 1, characterized in that the linkages (3) are arranged symmetrically alternately on the left and right along the longitudinal direction of the rope (1).

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