JPH0522640Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a ladder with a slip-stop fitting used for working on overhead cable lines, etc.

(Problems to be solved by the prior art and the invention) FIG. 5A is a diagram showing the state in which the ladder is used, and FIG. 5B is a schematic diagram of a conventional ladder stopper. In the figure, an overhead cable 2 is suspended from a utility pole 1 by a hanging wire 3. When carrying out work such as laying or connecting the overhead cable 2, the work is carried out using a ladder 4. In this case, in order to prevent the ladder 4 hung from the hanging line 3 from coming off, a ladder hook 6 is provided on the upper part of the ladder body 5, and the ladder hook 6 is hooked onto the hanging line 3. Further, a lever 8 is provided on the lower side of the ladder hook 6 so as to be rotatable by fitting into a shaft 7 implanted in the ladder main body 5. One end 9 of the lever 8 engages with a spring 10, one end of which is fixed to the ladder body 4, so that the opening 11 of the ladder hook 6 is always closed. Furthermore, a rope 13 for opening and closing the lever 8 from the ground is locked to one end 9 of the lever 8.

The ladder 4 is attached to and removed from the suspension line 3 as follows. When hanging the ladder 4 on the hanging wire 3, use the lever 8 between the ladder body 5 and the tip of the ladder hook 6.
By applying the hanging wire 3 to the holder and lowering the ladder 4, the lever 8 rotates in the direction of the arrow around the shaft 7, and the hanging wire 3 and the overhead cable 2 get over the lever 8.
A suspension line 3 is hung on the upper inner side part 12 of the ladder hook 6.
The lever 8 is pivoted back by the spring 10 to close the opening 11 of the ladder hook 6.

When removing the ladder, when the rope 13 is pulled from the ground, the lever 8 is rotated in the direction to open the opening 11 of the ladder hook 6. The end of the rope 13 is the ladder body 5
fixed to a hook (not shown) provided at an appropriate location,
Remove ladder hook 6 from the hanging line.

The conventional ladders mentioned above are equipped with a rope in order to operate the locking lever on the ground.If the ladder is toppled over while the rope is being operated, or if a worker at height is on the ladder, the worker on the ground may There is a risk of getting caught on something and causing an unexpected accident.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention skillfully combines a spring and a lever mechanism to provide a ladder with a stopper fitting that is inexpensive and easy to operate. An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the embodiments are merely illustrative, and it goes without saying that various changes and improvements can be made without departing from the spirit of the present invention.

Figures 1A and 1B are diagrams showing how an embodiment of the present invention is used;
Figure B shows a state in which the ladder is hung.

First of all, the explanation of the stopper mechanism will be explained later, and an outline of the operation of the ladder as a whole will be described. In the figure, like a conventional ladder, there is a U-shaped ladder hook 6 at the top of the ladder body 5.
is fixed with sufficient strength with the opening facing downward, and the L-shaped slide foot lever 14 has a
A slide hole 16 is provided in the long side 15 of the L-shape, and the slide hole 16 is held so as to be slidable up and down by playing with a slide bearing bolt 17. Further, the locking lever 18 is rotatably supported by a locking lever bearing bolt 19, and the free end of the locking lever 18 faces the opening 11 of the ladder hook 6, and the other end is rotatably attached to the connecting plate 20. freely connected. Further, the connecting plate 20 is pivotally supported by a bearing bolt 21 at the lower end of the slide lever 14, and the locking lever 18
A spring 22 is provided between the free end and the pivot support and at the lower end of the long side 15 of the slide lever 14.
is locked.

In such a mechanism, as shown in FIG. It is configured to be located below the upper end inner part 12.

Next, when the ladder 4 is lowered in an attempt to hang the ladder 4 on the suspension line 3, the suspension line 3 and the lower side 24 of the short side 23 of the slide foot lever 14 come into contact with each other, and when the ladder 4 is further lowered, the slide foot lever 14
is pushed upward while sliding by the hanging wire 3. As this slide lever lever 14 slides upward, the connecting plate 20 rotates around the connecting plate bearing bolt 21, and the locking lever 18 connected to the connecting plate 20 closes the opening 11 of the ladder hook 6. It rotates like this. This state is shown in FIG. 1B. If the opposite operation is performed, the locking lever 18 will return to the state shown in FIG. 1A by the action of the spring 22. The usage state of the ladder 4 has been outlined above, and the mechanism for preventing it from slipping off will now be described in detail.

Figures 2 to 4 are diagrams for explaining the slipping prevention mechanism in one embodiment of the present invention, in which Figure 2 is an exploded view, Figure 3 is a diagram with the ladder removed, and Figure 4 is a diagram showing the state in which the ladder is removed.
The figure shows a state in which a ladder is hung.

In FIG. 2, a ladder hook 6 is fixed to the upper end of the ladder main body 5 with sufficient strength by a band 25 with the opening of the U-shaped ladder hook 6 facing downward, and as a whole, from both sides and the back. The U-shaped fixing metal fitting 26 has fixing bolts 28 inserted into a plurality of fixing holes 27, and nuts 30 inserted through holes 29 provided in the ladder body 5 so as to surround the ladder body on both sides and the back. Fixed. Also, the hole 31 provided in the approximate center of the locking lever 18 and the hole 32 provided in the fixing bracket 26 are arranged so that the locking lever bearing bolt 1 is arranged so that the hole 31 is located on the outside of the hole 32.
9 and the bolt 33, the retaining lever 18 is rotatably supported. The tip of the locking lever bearing bolt used here has a female thread for the bolt. However, any bearing can be used as long as it fulfills the role of a bearing.

Next, a substantially rectangular slide hole 16 is provided in the long side 15 of the L-shaped slide lever 14 in the vertical direction, and the female thread 34 drilled in the head of the fixing bolt 28 and the slide bearing bolt 17 are connected vertically. It is attached so that it can be slid in the direction. Further, one end of the connecting plate 20 is rotatably connected to a hole 35 provided at the tip of the long side 15 of the slide lever 14 by a bearing bolt 21 and a bolt 36, and then the other end of the connecting plate 20 The respective connecting holes 37 and 38 with the stopper lever 18 are rotatably connected by a connecting pin 39. After the connecting pin 39 is connected, the shaft portion is crushed to prevent it from coming off.

Furthermore, the long side 15 of the slide lever 14
The spring 22 is engaged with a spring engagement ring 40 provided at the upper center of the spring 22 and a spring engagement hole 41 provided above the hole 31 of the retaining lever 18.

Next, further explanation will be given using FIGS. 3 and 4. In FIG. 3, the slide foot lever 14, which is engaged with the spring 22, and the anti-slip lever 18 are connected to each other when the slide foot lever 14 slides downward along the slide hole 16, and at the same time, the slide foot lever 14 is engaged with the spring 22. The connecting plate bearing bolt 21 provided at the tip of the long side 15 also slides downward, and the locking lever 18 connected to the connecting plate 20 rotates under the tension of the spring 22 and moves to open the opening 11. . In this state, when the ladder 4 is hung on the hanging wire 3, the state shown in FIG. 4 will be obtained. That is, the hanging wire 3 and the lower side 24 of the short side 23 of the slide lever 14 come into contact with each other, and the ladder 4
By lowering the slide lever 14, the slide lever 14 slides above the ladder main body 5. Along with this, the bearing bolt 21 provided at the tip of the long side 15 of the slide lever 14 also slides upward, and the connecting plate 2
The locking lever 18 connected to the spring 22 rotates to overcome the tension of the spring 22 and moves to close the opening 11. Further, the slide lever 14 stops when the lower side 24 of the short side 23 of the slide lever 14 and the upper inner side portion 12 of the ladder hook 6 coincide with each other. In this way, the ladder 4 is hung with the suspension line 3 and the overhead cable 2 positioned in the space formed by the anti-slip hook 18 and the ladder hook 6.

As explained above, in the ladder of the present invention, the locking lever can be automatically operated using a spring and a lever mechanism.

(Effects of the invention) The ladder with a stopper according to the present invention has workability and safety because the stopper lever automatically closes or opens the opening of the ladder hook 6 in conjunction with the hanging or unhooking of the ladder. It has the effect of improving sexual performance.

[Brief explanation of drawings]

Figures 1A and 2B show how an embodiment of the present invention is used, Figure 2 is an exploded view, Figure 3 is a diagram with the ladder removed, Figure 4 is a diagram with the ladder hung, 5
Figures A and B are diagrams showing the state of use of the ladder and a conventional ladder. DESCRIPTION OF SYMBOLS 1... Utility pole, 2... Overhead cable, 3... Hanging line, 4... Ladder, 5... Ladder body, 6... Ladder hook, 11... Opening, 12... Upper inner part, 1
4...Slide foot lever, 15...Long side, 1
6...Slide hole, 17...Slide bearing bolt, 18...Preventing lever, 19...Preventing bearing bolt, 20...Connecting plate, 21...Bearing bolt, 22...Spring, 23...Short side ,2
4...Lower side, 25...Band, 26...Fixing bracket, 28...Fixing bolt, 31, 32, 35...
Hole, 34...Female thread, 36...Bolt, 37,3
8... Connection hole, 39... Connection pin, 40... Spring hanging ring, 41... Spring hanging hole.

Claims (1)

[Scope of utility model registration request] A U-shaped ladder hook 6 is attached to the upper end of the ladder main body 5 with the opening facing downward, and a U-shaped fixing metal fitting 26 consisting of both sides and the back is attached to at least one of the upper parts of the ladder main body 5, which wraps around the ladder main body. The long side 15 of the L-shaped slide foot lever 14 is attached to the ladder body to which the fixing fitting 26 is fixed so as to be slidable in the vertical direction, and one end of the connecting plate 20 is attached to the lower part of the slide foot lever 14. At the same time, the other end of the connecting plate is rotatably connected to the other end of the locking lever 18 that is pivotally connected to the fixing fitting 26, and between the free end of the locking lever 18 and the pivot support. and above the long side 15 of the slide foot lever 14, so that when the ladder is not hung on the suspension line, the lower side of the short side of the slide foot lever 14 is on the inside of the upper end of the ladder hook 6. A ladder with a stopper fitting that is located further down.