JPS59472Y2 - ladder safety device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ladder safety device for preventing a work ladder set up against a telephone pole or the like from slipping and falling, thereby ensuring safety.

When carrying out overhead line work on utility poles, workers sometimes wrap ropes around the poles and workers, but generally workers lean against the poles by leaning ladders and work on them while climbing on top of the ladders.

When using a ladder in this way, it is mandatory to tie the tip of the ladder to the telephone pole with a rope for safety reasons, but because it is cumbersome, the work is carried out with the ladder simply leaning against it. There are many times.

As a result, the top end of the ladder could slip and fall, which not only caused an unexpected accident, but also caused damage to passersby and was extremely dangerous.

The present invention solves the above-mentioned drawbacks by attaching a safety device to the tip of the ladder, which allows the ladder to be easily fixed to the utility pole and prevents it from slipping and falling, allowing for safe work.

Hereinafter, the present invention will be described in detail with regard to the embodiments shown in the drawings.

As shown in Figures 1 and 4, a fixing bracket 1 for attaching to a side frame column on one side of a ladder is made up of two metal plates 1a and lb which are connected in a planar manner with bolts 2 and 2 so that they can be opened and closed. A horseshoe-shaped attachment ring 3 is fixed to the outer surface of one metal plate 1a by welding or the like.

Further, on both abutting surfaces of the metal plates 1a and lb, oppositely wide,
Two narrow grooves 4 a , 4 b and 5 a , 5 b are formed.
a, 5 b are the main columns 6 of the side frame columns of ladder A shown in Fig. 4.
and an auxiliary column 7 which is thinner than the main column 6. The main column 6 is held between the wide grooves 4a and 4b, and the auxiliary column 7 is held between the narrow grooves 5a and 5b. That's how it is.

8 in the figure is the crossbeam of the ladder. Next, as shown in Fig. 2 and Fig. 4, the operating fitting 9 for attaching to the side frame column on the other side of the ladder is made by connecting two metal plates 9a and 9b in a planar manner.
10, 10 are connected so that they can be opened and closed, and the metal plate 9 a
, 9 b Two wide and narrow concave grooves 1 facing each other on both abutting surfaces
1a, 111) and 12a, 12b are recessed, and these grooves 11a and 11b sandwich the main pillar 6 of the side frame pillar of the ladder, and the grooves 12a and 12b sandwich the auxiliary pillar 7. That's how it is.

One of the metal plates 9a of the operation fittings 9 is relatively thick and has a through hole 13 running through it in the vertical direction. A rope 14 is inserted through the through hole 13, and a hook that can be opened and closed is attached to one end of the rope 14. 15 is installed.

Further, the metal plate 9a has a groove 16 communicating with the through hole 13.
is provided, both ends of a shaft 17 are fixed to the opposing wall of this split groove 16, and the attachment hole 18a of the lever 18 is loosely fitted to this shaft 17, so that the lever 18 is pushed into the split groove 16 in the shape of a rod. Lever 1
Arc-shaped ratchet teeth 19 formed at the inner end of the ratchet 8 face the through hole 13.

The lever 18 is biased by a spring 20 attached to the shaft 17 so that the ratchet teeth 19 are brought into pressure contact with the rope 14, and the lever 18 is energized in the direction A in which the hook 15 is pulled back in FIG. The rope 14 can be pulled out in the direction to shorten the section, or conversely, even if the rope tab 14 on the hook side is pulled, the rope tab 14 is stopped by the ratchet teeth 19 to prevent it from slipping.
When the lever 18 is moved against the spring 20 to lift the ratchet teeth 19 from the rope 14, the rope 14 becomes free and can freely slide inside the through hole 13.

Thus, the present invention consists of the fixing fitting 1, the operating fitting 9, and the rope 14.
and hook 15.

Since the present safety device is constructed as described above, first, loosen the bolts 2, 2 of the fixing fitting 1, widen the distance between the metal plates 1a, lb, and connect the grooves 4a, 4b to the upper end of the ladder A. The concave grooves 5a and 5b are respectively engaged with the auxiliary column 7 on the main column 6 on one side of the main column 6, and the bolts 2 and 2 are tightened to clamp and fix the operation fitting 9.
Similarly, the concave grooves 11a and 11b are engaged with the main column 6 on the other side, and the concave grooves 12a and 12b are engaged with the auxiliary column 7, respectively, so that they are clamped and fixed.

After that, the ladder A with the fixing bracket 1 and the operating bracket 9 attached is placed against the utility pole B by wrapping the rope 14 drawn out from the operating bracket 9 around the back side of the utility pole B and attaching the hook 15 at the end to the horseshoe shape of the fixing bracket 1. Connect the rope 14 to the ring 3 and sequentially pull out the rope 14 at the end of the operation fitting 9.
Complete the setting operation for ladder A by tensioning it to utility pole B (see Figure 4).

Ladder A fixed to utility pole B in this way has operating bracket 9
Since the rope 14 is stopped by the teeth 19 of the ratchet I, making it impossible for the rope 14 to return, the risk of the upper end of the ladder A slipping is completely prevented.

When removing the ladder A after completing the work, hold the lever 18 rotated in the direction of the arrow by hand against the elasticity of the spring 20, return the rope 14 to the hook 15 side, and attach the hook 15 in a horseshoe shape. Just remove it from ring 3.

In addition, although the embodiment of the present invention has been described as applied to a ladder having a main column and an auxiliary column, it is of course possible to apply the present invention to a ladder having only one side frame column.

As described above, according to the proposed safety device, when leaning a ladder against a utility pole etc., it can be fixed quickly and easily, and the fixed state is secure, preventing slipping and falling. It has many practical effects such as making work safer.

[Brief explanation of drawings]

Figure 1 is a slope view of the fixing bracket in this proposal, Figure 2 is a slope view of the operating bracket, and Figure 3 is a vertical cross-sectional view of the operating bracket.
FIG. 4 is an explanatory diagram of the usage state. 1...Fixing bracket, 3...Horseshoe-shaped mounting ring, 4a, 4b, 5a, 5b...Concave groove, 9...
...Operation fittings, 11a, 11b, 12a, 1
2b... Concave groove, 14... Rope bulb, 1
5...Hook, 18...Lever, ]9
...Ratchet tooth, 20 ... Yes,
A: Ladder, B: Telephone pole.

Claims (1)

[Scope of utility model registration request] One metal plate having a mounting ring on the outer surface, and the other metal plate, each having grooves on both abutting surfaces, and a fixing bracket that can be clamped to the side frame column on one side of the ladder by these grooves, and one end of the metal plate. Insert the rope equipped with the hook into the through hole,
It consists of one metal plate with a lever that can slide the rope only in the direction of shortening the rope portion on the hook side by pressing the ratchet teeth on the rope, and the other metal plate. It consists of an operating fitting that has a concave groove on the abutting surface so that it can be clamped and fixed to the side frame column on the other side of the ladder, and the rope is wound around the back side of a utility pole, etc., and the hook is connected to the attachment ring and the rope is pulled. This safety device for a ladder is configured such that the ladder is tensioned to prevent the ladder from slipping and falling, and the ratchet teeth of the lever are lifted from the rope, the rope is in a free state, and the hook is removed from the attachment ring to remove the ladder.