JPH0355755Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention relates to a ladder that is convenient for transporting cargo to high places.

[Background technology]

When performing various types of work on roofs, scaffolding, and other high places, it may be necessary to carry equipment, etc. to the working position. In such cases, it is common practice for a person to climb the ladder by holding the equipment or other luggage directly, or to suspend the luggage with a rope and pull the luggage up along the ladder by handing the rope from the higher side. It is true.

However, with this method, once the load is started, a person must continue to support the load until it reaches a stable position where there is no risk of it falling. This was both a heavy burden on workers and dangerous.

[Purpose of invention]

This invention was made in view of the above-mentioned circumstances, and the purpose is to provide a ladder that allows work to be carried out easily and safely when transporting cargo to high places.

[Disclosure of invention]

That is, the ladder according to this invention is a ladder constructed by spanning a plurality of step members between a pair of support frames parallel to each other. A plurality of rotational support rods are provided in multiple stages so that each rotational support rod is biased in the upright direction, and each rotational support rod is rotated between A feature is that a stopper is provided to prevent downward rotation of the support rod. below,
This will be explained based on the embodiment shown in the drawings.

Figure 1 shows an example of a ladder according to this invention. This ladder 1 has a pair of support frames 2, 2 made of prismatic columns installed in parallel to each other, with an appropriate interval between each support frame 2, 2 from the upper end A to the lower end B. multiple steps 3, 3...
is being passed over. Furthermore, as shown in the cross-sectional view of FIG. 2, rotary support rods 4, 4, . .

The rotation support rod 4 is formed as a bar with a hollow interior, and its base 4a is pivotally attached to the side of the support frame 2 by a pin 6. A torsion coil spring 7 is wound around the pin 6, and one end 7a of the torsion coil spring 7 abuts against the inner surface of the rotation support rod 4, and the other end 7b abuts against the fixture 9. Therefore, it is fixed to the support frame 2. Due to the action of the torsion coil spring 7, the rotary support rod 4 is biased so as to stand up in a direction substantially perpendicular to the support frame 2 towards the front when the ladder 1 is used in a leaning position. Further, a protruding stopper 10 is provided on the lower side of the support frame 2, and is configured to prevent the rotation support rod 4 from rotating downward (in the direction B). The rod 4 is supported substantially perpendicularly to the support frame 2, as shown, even if a load is applied thereon.

Furthermore, when an upward force is applied to the rotation support rod 4, the rotation support rod 4 resists the torsion coil spring 7 until it becomes almost parallel to the support frame 7, as shown by the chain line in FIG. and rotate upward (direction A).

Figures 3 a to c show how the ladder 1 is used.
As it is pulled up along the load 13, the rotating support rod 4 is pushed up by the cargo 13 and laid down until it is almost parallel to the support rod 2, so it no longer gets in the way of the lifting operation and the lifting operation can be continued smoothly. be able to. When the load 13 passes through the rotation support rod 4, the rotation support rod 4 is erected again by the action of the torsion coil spring 7 and returns to its original vertical state. When it is desired to take a break during the lifting operation, the load 13 can be placed on the rotating support rod 4 in an upright position, as shown in FIG. 3c. Since the rotation support rod 4 is supported by the stopper 10, the loaded cargo 13 will not fall. Further, even if the user accidentally releases the rope 12 during the pull-up, the rotary support rod 4 prevents the load 13 from falling, thereby preventing an accident.

The same applies when a person carries luggage and climbs the ladder 1. When a person gets tired, he or she can place the luggage on the rotation support rod 4 and take a rest, making it easier.

[Effect of idea]

As is clear from the above explanation, the ladder according to this invention is a device that allows you to stop the work and take a break during transport when transporting cargo to a high place. Now it can be done easily and safely.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a ladder according to this invention, FIG. 2 is a sectional view of the main part thereof, and FIGS. 3 a to 3 c are explanatory views showing the state in which it is used. 1... Ladder, 2... Support frame, 3... Step,
4... Rotation support frame, 6... Pin, 7... Torsion coil spring, 9... Fixture, 10... Stopper, 1
2...rope, 13...luggage.

Claims (1)

[Scope of utility model registration request] In a ladder constructed by extending a plurality of step members between a pair of mutually parallel support frames, the sides of the support frames have an upright direction substantially perpendicular to the support frames and an upward direction substantially parallel to the support frames. A plurality of rotation support rods are provided in multiple stages so as to rotate between the two directions, and each rotation support rod is biased in the upright direction, and the support frame is provided to prevent each rotation support rod from rotating downward. A ladder characterized by having a stopper for lifting the ladder.