JP4287018B2 - ladder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ladder, and more particularly to a ladder suitable for high-altitude work for construction of electric wires and other strands laid in the air.
[0002]
[Prior art]
Conventionally, ladders are often used when performing overhead wire work such as electric wires or repair work, but in order to ensure the safety of the worker, a fall prevention device for raising and lowering is also used as a safety device.
[0003]
As an example of such a fall prevention device for raising and lowering, a hook that is locked to an overhead wire is provided, and a belt is attached to a safety device provided with a stopper mechanism that exerts a braking force against a sudden force such as an automobile seat belt. There is something that can be wound up freely, and at the tip of the belt is attached to a safety belt wound around the operator's waist via a shock absorber for buffering when sudden braking is applied by the safety device. An operator hook to stop is provided.
[0004]
And when actually working at a high place, hook the hook of the safety device to the tip of a separately prepared telescopic operation rod, extend the operation rod and lock the hook to an overhead wire, etc. The operator hook is pulled up and connected to the worker's safety belt, and the ladder is climbed to work at a high place.
[0005]
Even if an operator falls from the ladder, the safety device operates and brakes the master rope suddenly, so that the operator can be stopped in the middle of the fall to prevent a serious accident. It is something that can be done.
[0006]
However, as described above, in order to lock the master rope to the overhead wire, it is necessary to use a separate operation rod, and the safety device provided with a hook is quite heavy and requires physical strength. ing.
[0007]
Therefore, using an anti-falling fall prevention device with a master rope, as a suitable ladder for the same device, in Japanese Utility Model Laid-Open No. 7-1298, a hook for locking an overhead wire is attached to the top of the ladder main body that is foldable or extendable. The attachment and the thing of the structure which provided the connection metal fitting which connects and connects the tip of the master rope of the fall prevention tool for raising / lowering freely were proposed in the lower end of the hook.
[0008]
In order to perform work at a high place using such a ladder and a fall prevention device for raising and lowering, first, on the ground, a connection fitting provided on a hook for locking an overhead wire of the ladder was provided at the tip of the main rope of the fall prevention device for raising and lowering. A connecting tool (so-called carabiner) is engaged, the ladder body is extended, and the overhead wire locking hook is locked to the overhead wire.
[0009]
Then, the master rope hangs down from the connector, and the safety device of the same structure (seat belt type) is attached to the master rope, the lower end of the master rope is tied to the lower part of the ladder, and one end is used as the safety device. The other end of the connected connecting rope is connected to a safety belt that is mounted on the waist in advance, and the ladder is climbed to start work. Even in this case, a shock absorber is interposed in the connecting rope.
[0010]
Therefore, even if the operator falls, the operator can be stopped in the middle of the fall to prevent a serious accident, and the main rope tip can be detachably connected to the ladder locking hook of the ladder. By providing the metal fittings in advance, it is no longer necessary to lock the master rope to the overhead wire using the operation rod, and the labor for high places such as overhead wire construction can be saved.
[0011]
[Problems to be solved by the invention]
However, the following problems still remain in the above-described ladder that is appropriately configured for overhead wire construction and the like.
[0012]
In other words, even if a connecting bracket is provided on the hook for hooking the overhead wire, no consideration is given to usability, and the connecting bracket is only fixed on the side of the hook on one side, The stop hook itself was also fixed to the ladder body.
[0013]
Therefore, it is difficult to connect the connecting tool of the safety device for preventing lifting, and once it is connected, it is not possible to move the connecting tool to the opposite side when working by raising the ladder. In addition, there was no degree of freedom corresponding to other types of safety devices for preventing elevation.
[0014]
Furthermore, the lower end of the master rope must be firmly fixed to the lower part of the ladder. If there is any looseness, the safety device cannot be lifted and the worker cannot climb the ladder. there were.
[0015]
Also, when viewed as an original ladder, the hook protrudes and gets in the way during transportation and storage after use, and it also has the disadvantage that the hook easily deforms and breaks because it easily hits things, Depending on the strength of the impact, there was a risk of deformation to the ladder body.
[0016]
An object of the present invention is to provide a ladder capable of solving the above-described problems.
[0017]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the present invention according to claim 1, a hook formed in a substantially inverted U shape is provided at the tip of the ladder body, and a safety device for a fall prevention device for raising and lowering is provided near the lower end of the hook. A ladder provided with a coupling fitting to be detachably connected, wherein the hook is rotatably attached to the ladder main body in a horizontal direction, and the coupling fitting can be swung up and down with respect to the hook; and It was mounted so as to be rotatable in the horizontal direction.
[0018]
Further, in the present invention described in claim 2, an elastic body is provided that urges the connection fitting in an inner direction of the ladder body.
[0019]
Further, in the present invention described in claim 3, the ladder body is configured to be extendable and retractable with a plurality of ladder ladders attached to the parent ladder so as to be movable up and down.
[0020]
In the present invention described in claim 4, the hooks provided with the connecting metal fittings are respectively attached to the left and right uppermost ends of the ladder body.
[0021]
Furthermore, in the present invention described in claim 5, the second connecting metal fitting for temporarily fixing the lower end portion of the elevating fall prevention device is provided in the vicinity of the lower end of the ladder body.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is a ladder in which a hook formed in a substantially inverted U shape is provided at the tip of the ladder main body, and a connecting bracket is provided near the lower end of the hook to removably connect a safety device for a fall prevention device for lifting. The hook is attached to the ladder main body so as to be rotatable in the horizontal direction, and the connecting fitting is attached to the hook so as to be swingable up and down and horizontally.
[0023]
That is, since the hook can be freely directed to the back side and the side surface of the ladder body, it can be easily locked to a strand and the like, and the connecting bracket can be swung vertically and horizontally with respect to the hook. Since it is attached so as to be freely rotatable in the direction, it is possible to easily connect the connecting tool provided in the safety device of the falling-preventing fall-preventing device and the tip of the master rope, and the handling becomes easy. The connecting device provided in the safety device may be provided directly on the safety device or may be attached via a rope, a belt, or the like.
[0024]
In addition, the connecting bracket can be rotated to an unobstructed position, and if the hook is contracted inward, there is no protrusion due to the hook, and transportation, storage and storage are facilitated.
[0025]
In addition, an elastic body that urges the connection fitting toward the inner side of the ladder main body can be provided so that the connection fitting always returns to a predetermined position when the connection fitting is rotatable.
[0026]
With such a configuration, the connecting metal fitting does not get in the way when stored when not in use, and it does not hit and deform or damage any object.
[0027]
By the way, the hook attached to the upper end of the ladder body is preferably provided with a wall surface contact portion having a certain length in the horizontal direction at the bent portion.
[0028]
That is, when the ladder according to the present invention is used while leaning against a wall surface, the wall surface contact portion can reliably support the ladder and can prevent side skidding with certainty.
[0029]
Furthermore, it is desirable that the ladder main body has an extendable structure in which a plurality of ladder ladders are attached to the main ladder so as to be movable up and down, and the ladder main body can be easily shaken and easily extended even in a narrow place. It does not require any physical strength when installing the ladder. In particular, installation work such as leaning is easy even if the fall prevention device for raising and lowering is kept locked on the upper part of the ladder or other parts are attached and heavy.
[0030]
Further, the hooks provided with the above-mentioned connecting fittings can be respectively attached to the left and right uppermost ends of the ladder body.
[0031]
That is, by providing a connecting bracket on each of the left and right hooks, the connecting bracket can be freely selected according to work or according to the convenience of the operator, and can be connected from any direction. By locking the falling-prevention falling prevention device to both of the connecting fittings, the falling-prevention falling prevention device itself can be reliably prevented from falling off, and safety can be further improved.
[0032]
Furthermore, the 2nd connection metal fitting which temporarily fixes the lower end part of the fall prevention tool for raising / lowering can also be provided in the lower end vicinity of the said ladder main body.
[0033]
By providing such a second connection fitting, it is possible to deal with various fall prevention devices for raising and lowering.
[0034]
For example, in the case of a type of fall prevention device for raising and lowering that is used by attaching a safety device to the overhead wire or the upper end of the ladder in advance, the rope such as the master rope extending from the safety device locked at a high place is the above-mentioned Since it can be connected to the 2 connecting brackets, tools for pulling the rope (such as a pulling rope) become unnecessary, improving operability and reducing the number of tools required for safe work, preventing misplacement, etc. it can.
[0035]
In addition, if the master rope is used, the lower end of the master rope can be securely bound to the second connecting fitting, and the rope can be held in a tension state.
[0036]
As described above, according to the present invention, it is possible to remarkably improve the safety and workability of high-altitude work using a ladder for overhead wire work or the like.
[0037]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0038]
FIG. 1 is an overall front view of a ladder A according to the present embodiment, and FIG. 2 is a side view thereof.
[0039]
As shown in the figure, the ladder A according to the present embodiment is provided with a first ladder L1 as a parent ladder on the lower side, and a second ladder L2 and a third ladder L3 are connected to the first ladder L1. An extendable ladder body L is constructed, and an outrigger 11 is provided at the lower ends of the left and right side members 1,1 of the first ladder L1 so as to be able to project outward. Further, on the back side of the first ladder L1, The second ladder L2 is attached so that it can slide up and down. The third ladder L3 is slidably mounted in the side material 1,1 of the second ladder L2, and hooks F, F for locking the strand 7 such as an overhead wire to the end of the side material 1,1. Is provided. Reference numeral 10 is a step rail, and 12 is a slide lock section.
[0040]
The hook F is formed by a hollow pipe in a substantially inverted U shape as shown in FIG. 3. In this embodiment, the hook F can be moved up and down at the tip of the hollow side member 1, 1 of the third ladder L 3. And a leg 2 that is rotatably mounted, a locking part 3 provided in parallel to the leg 2, and a bent part of a hook F formed in a substantially inverted U-shape, wherein the leg 2 And the wall surface contact part 4 provided in the part which connects the latching | locking part 3 is comprised.
[0041]
For example, when the ladder A according to the present embodiment is used by leaning against a wall surface or the like by the wall surface contact portion 4, if the hooks F are rotated to the sides of the side members 1, the wall surface contact portion 4 The ladder A can be reliably supported and side slip can be reliably prevented. 40 is a convex part for increasing the frictional force.
[0042]
Further, in this embodiment, as shown in FIG. 4, a stopper mechanism S that opens and closes the hook F is disposed at the tip of the locking portion 3 of one hook F. Reference numeral 5 denotes a stopper piece which is a main component of the stopper mechanism S, and is pivotally supported at the tip of the locking portion 3 by a support shaft. The hook F will be described in detail later.
[0043]
With the configuration described above, the ladder A according to the present embodiment has a configuration in which the hook F is locked to the strand 7 in the air and the work at a high place can be performed safely in a stable state.
[0044]
Further, the second and third ladders L2 and L3 are contracted, and the hook F is also contracted, so that it becomes compact as shown in FIG. Further, if the hook F is rotated inward of the ladder body L, there is no protrusion, so that there is no problem in transportation, storage and storage.
[0045]
In the ladder A configured as described above, the feature of the present invention is that, as described above, in addition to the hook F being slidable up and down with respect to the ladder main body L and being rotatable in the horizontal direction, In the vicinity of the lower end of the hook F, there is provided a connection fitting 8 for detachably connecting the safety device B1 of the lifting prevention tool B for lifting, and the connection fitting 8 can be swung up and down with respect to the hook F, and This is because it is mounted so as to be rotatable in the horizontal direction (see FIGS. 3, 6, and 7).
[0046]
That is, since the hook F is attached so as to be freely directed to the back side and the side surface of the ladder main body L, it can be easily locked to the strand 7 or the like in any direction, and the hook F On the other hand, by attaching the connecting bracket 8 so that it can swing up and down and rotate in the horizontal direction, the tip of the rope, such as the connecting tool B2 provided on the safety device B1 of the falling-prevention device B for lifting and lowering, etc. The parts can be easily connected from any direction, and handling becomes extremely easy.
[0047]
The fall prevention device B for raising and lowering is provided with a safety device B1 having a function of applying a sudden braking when a sudden force is applied, and a belt B3 is wound around the safety device B1 so as to be unwound. There are various types such as a type attached to a rope such as a master rope that is suspended on the ground by being locked to the strand 7 or the like. B can be supported.
[0048]
The structure of the connection fitting 8 according to the present embodiment will be described. As shown in FIGS. 6 and 7, the connection fitting 8 includes an annular mounting body 80 formed in a substantially ring shape so as to hold the leg portion 2 of the hook F. A metal fitting body 81 that is rotatably attached around the axis of the leg portion 2 and is formed in a substantially U shape on the annular attachment body 80 is attached via a pivot pin 82 so as to freely swing up and down. 81a is a pivot connecting portion of the metal fitting body 81, and has a shape that is narrowed inward compared to the tip end side of the metal fitting body 81.
[0049]
With the above-described configuration, the connecting metal fitting 8 can freely rotate and rotate to a position that does not get in the way, and as described above, the left and right hooks F must be contracted inward. Therefore, there is no bulging by the hook F, and transportation, storage and storage are easy. In FIG. 6, E is an operation lever for extending / contracting / rotating the hook F.
[0050]
As another embodiment, as shown in FIGS. 8 and 9, the metal fitting 81 is made of an elastic body so as to be directed inward of the ladder A by a linear spring 83 so as not to disturb the storage. Can be energized. In the illustrated example, the second spring 84 that urges the metal fitting body 81 in a horizontal state is also provided, but the spring 84 may be omitted.
[0051]
Thus, by urging the connecting bracket 8, that is, the bracket main body 81 substantially inward of the ladder A, the operation is automatically completed when the connection tool B2 provided in the safety device B1 is connected. Therefore, when the ladder A is stored, the connection fitting 8 does not protrude outside and hit an object, and there is no possibility of damage.
[0052]
Further, since the ladder body L is configured to be extendable and retractable by attaching the second and third ladders L2 and L3 to the first ladder L1 so as to be movable up and down, the ladder body L is vibrated even in a narrow place. It can be easily extended and can be easily extended. When the ladder A is installed, it does not require physical strength and is easy to handle.
[0053]
Moreover, since the said connecting metal fitting 8 is provided in each right and left hook F, it can select freely according to work or according to the convenience of the operator M, and the fall prevention tool B for raising / lowering can be connected from any direction. .
[0054]
Further, in this embodiment, the fall prevention device B for raising and lowering is such that the belt B3 is wound around the safety device B1 and the lower end of a rope such as a master rope is fixed near the ground. The ring-shaped second connecting bracket 8 can be temporarily fixed to the lower part of the ladder body L, that is, directly above the outrigger 11, or the lower end of the master rope can be trapped. 'I have established.
[0055]
The second connecting fitting 8 'is formed in a ring shape, and if the belt B3 of the safety device B1 or a master rope is used for this, the lower end of the master rope can be temporarily fixed. Even when the safety device B1 is attached to the strand 7 such as an overhead wire in advance, the safety device B1 is first attached to the connecting bracket 8 of the ladder A, and the belt B3 and the lower end of the master rope are connected to the second end. The ladder main body L may be extended after being connected to the connecting metal fitting 8 ', and an operation bar for locking at a high place such as an overhead wire is not required.
[0056]
In addition, tools (drawing ropes, etc.) that draw the belt B3 or parent rope from the safety device B1 locked at a high location are no longer necessary, improving operability and reducing the number of tools required for safe work. It can prevent misplacement.
[0057]
Here, the ladder A of the present embodiment is used in combination with the fall prevention device B for raising and lowering the belt B3 that is wound around the safety device B1 that applies sudden braking when a sudden force is applied. The case of engaging in work at a high place will be described with reference to FIGS. 5 and 10. In the figure, B4 is a carabiner that is connected between the connecting tool B2 of the safety device B1 and the connecting fitting 8, and B5 is a safety belt hook that is connected to the safety belt M1 of the worker M. Although not shown, a shock absorber can be interposed between the safety belt hook B5 and the belt B3.
[0058]
As shown in FIG. 5, first, the connection tool B2 of the safety device B1 is locked to the connection fitting 8 of the ladder A through a carabiner B4 or the like. Then, the safety belt hook B5 attached to the tip of the belt B3 led out from the safety device B1 is locked to the second connecting fitting 8 ′.
[0059]
Next, the outrigger 11 is extended to stabilize the ladder body L, the ladder telescopic rope 13 is operated to extend the ladder body L, and the hook F is locked to the strand 7. At this time, the belt B3 extends from the safety device B1 as the ladder body L extends. The outrigger 11 may be extended after the ladder A is extended.
[0060]
Thereafter, the safety belt hook B5 provided at the tip of the belt B3 is connected to the safety belt M1 of the worker M, and the ladder A is climbed as shown in FIG.
[0061]
Further, for example, as shown in FIG. 11, in some cases, the elevating / lowering fall prevention device B can be locked to both the left and right connecting fittings 8.
[0062]
In this case, it is preferable that the connecting belt B6 is connected between the safety device B1 and the carabiner B4, and the safety device B1 is positioned substantially at the center of the ladder A.
[0063]
As described above, when the safety device B1 is connected to the left and right connecting fittings 8 and 8, the falling prevention tool B itself can be reliably prevented from falling off, so that safety is further improved.
[0064]
As described above, according to the present embodiment, it is possible to remarkably improve the safety and workability of high-altitude work using the ladder A such as overhead work.
[0065]
Here, the hook F provided on the main ladder A will be further described.
[0066]
As shown in FIG. 4, the hook F is formed in a substantially inverted U shape by a hollow pipe, and is composed of the leg portion 2, the locking portion 3, and the wall surface contact portion 4 made of synthetic resin. ing.
[0067]
In addition, the stopper mechanism S provided inside the locking portion 3 of one hook F includes the stopper piece 5 that is rotatable about the support shaft 6 that penetrates the locking portion 3 as described above. is doing.
[0068]
The stopper piece 5 has a base portion that is supported by the support shaft 6 in a substantially circular cam shape, an engaging portion 5a that engages with a lock member 51 described later, and a downward direction of the stopper piece 5 on its peripheral surface. And a rotation restricting stopper 5b for restricting the amount of rotation, and the stopper portion 5c is extended from a position opposed to the engaging portion 5a with the support shaft 6 interposed therebetween.
[0069]
Further, the stopper mechanism S is provided with a torsion spring 50 that urges the stopper piece 5 to rotate downward and outward, and a hook closing position (indicated by a one-dot chain line X) by the stopper portion 5c of the stopper piece 5. A lock member 51 is provided for preventing rotation in a lower outer direction than that shown in FIG.
[0070]
The lock member 51 is formed of a plate-like body having an engaging convex portion 51a formed in the lower portion, and is disposed above the stopper piece 5 so as to be slidable in the hook F up and down. The engaging portion 5a of the piece 5 can be engaged.
[0071]
Further, a coil-like compression spring 52 for urging the lock member 51 toward the stopper piece 5 is disposed above the lock member 51, and the engagement between the stopper piece 5 and the lock member 51 is released. The unlocking string 53 is attached.
[0072]
That is, one end of the unlocking string 53 is connected to the upper end of the lock member 51, and the other end serving as the tip portion is placed in the hook F so that the inside of the third ladder L3 and the second ladder L2 of the ladder body L Through, it is extended to the outer intermediate position of the first ladder L1 serving as the lower ladder.
[0073]
When the lock release string 53 is pulled, the lock member 51 can be pulled up against the urging force of the compression spring 52, the engagement between the stopper piece 5 and the lock member 51 is released, and the stopper piece 5 can be rotated to the initial position below by the force of the torsion spring 50.
[0074]
The unlocking string 53 extends in the ladder main body L, but the end of the unlocking string 53 is always in the middle of the first ladder L1 even when the ladder main body L is extended or contracted. It is adjusted so as to be positioned by a release string extending mechanism including a pulley, a tension spring, etc. (not shown).
[0075]
30 is a notch formed on the back surface of the locking portion 3 so that the stopper piece 5 can be rotated, 51 b is a string connecting portion provided at the upper end of the lock member 51, and 54 is a guide slot provided in the lock member 51. It is. Reference numeral 55 denotes a guide pin inserted through the guide long hole 54, and both ends thereof are fixed to the peripheral side surface of the locking portion 3, like the support shaft 6 of the stopper piece 5.
[0076]
【The invention's effect】
The invention is carried out in the above-described form and has the following effects.
[0077]
(1) In the first aspect of the present invention, a hook formed in a substantially inverted U shape is provided at the front end of the ladder body, and a safety device for the fall-preventing fall prevention device is detachably connected in the vicinity of the lower end of the hook. A ladder provided with a connecting bracket, wherein the hook is attached to the ladder main body so as to be rotatable in the horizontal direction, and the connecting bracket can be swung up and down with respect to the hook and rotated in the horizontal direction. Because it is attached freely, it can be easily locked to the strand, etc., and the connecting bracket can be swung up and down and rotated horizontally in the same direction to the hook, so that the fall prevention device for raising and lowering It is possible to easily connect the connector provided in the safety device and the tip of the master rope, and the handling becomes easy. In addition, the connecting bracket can be rotated to an unobstructed position, and if the hook is contracted inward, there is no protrusion due to the hook, and transportation, storage and storage are facilitated.
[0078]
(2) In the present invention according to claim 2, by providing an elastic body for urging the coupling metal in the direction of the inside of the ladder body, the coupling metal is not obstructed during storage when not in use, It won't be deformed or damaged by hitting something.
[0079]
(3) In the present invention described in claim 3, the ladder main body is configured to be extendable and retractable by attaching a plurality of ladder ladders to the parent ladder so as to be movable up and down. It is easy to vibrate and can be easily extended, and no physical strength is required when installing the ladder. In particular, the extension work is facilitated even when the fall prevention device for raising and lowering is kept locked on the upper part of the ladder or when other parts are attached and become heavy.
[0080]
(4) In the present invention described in claim 4, the hooks provided with the above-mentioned connecting metal fittings are respectively attached to the left and right uppermost ends of the ladder main body, so that the connecting metal fittings can be attached according to the work or the convenience of the operator. It can be freely selected and can be connected from any direction, and in some cases, locking the elevating fall prevention device to both connecting brackets ensures that the elevating fall prevention device itself is reliably prevented from falling off and is safe. Can be further enhanced.
[0081]
(5) In the present invention according to claim 5, by providing the second connecting metal fitting for temporarily fixing the lower end of the rope provided on the lifting fall prevention device in the vicinity of the lower end of the ladder body, various fall preventions for raising and lowering are provided. It becomes possible to deal with equipment. For example, if the safety device is attached to a safety wire in advance and used, it is not necessary to use an operation rod for locking the safety device to a high place such as an overhead wire. If the rope is attached to the upper end of the ladder in advance, the rope such as the master rope extending from the safety device locked at a high place can be connected to the second connecting bracket by ground work. Tools for drawing (drawing ropes, etc.) are also unnecessary, improving operability and reducing the number of tools required for safe work, thereby preventing misplacement and the like.
[Brief description of the drawings]
FIG. 1 is an overall front view of a ladder according to an embodiment.
FIG. 2 is an overall side view of the ladder.
FIG. 3 is an explanatory diagram of a hook.
FIG. 4 is an explanatory diagram of one hook.
FIG. 5 is an explanatory view showing a state before the ladder is extended.
FIG. 6 is an explanatory view of the coupling metal in a side view.
FIG. 7 is an explanatory view in plan view of a connecting metal fitting.
FIG. 8 is an explanatory view in a side view showing another embodiment of a connecting metal fitting.
FIG. 9 is an explanatory view in plan view showing another embodiment of a connecting metal fitting.
FIG. 10 is an explanatory diagram showing an example of a usage state of a ladder.
FIG. 11 is an explanatory diagram showing an example of a usage state of a ladder.
[Explanation of symbols]
A Ladder B Fall prevention device B1 Safety device F Hook L Ladder body 8 Connecting bracket
8 'Second connecting bracket
83 Spring (elastic body)

Claims (5)

At the tip of the ladder body (L), there is a hook (F) formed in a substantially inverted U shape, and the safety device (B1) of the fall prevention device (B) for lifting and lowering can be freely attached near the lower end of the hook (F). A ladder provided with a connecting bracket (8) to be connected to
The hook (F) is attached to the ladder main body (L) so as to be rotatable in the horizontal direction, and the connecting bracket (8) can be swung up and down with respect to the hook (F), and the horizontal direction. A ladder characterized in that it can be rotated freely. The ladder according to claim 1, further comprising an elastic body (83) for urging the connection fitting (8) in an inner direction of the ladder body (L). The ladder according to claim 1 or 2, wherein the ladder main body (L) has a configuration in which a plurality of ladder ladders (L2 to Ln) are attached to the parent ladder (L1) so as to be movable up and down. The ladder according to any one of claims 1 to 3, wherein the hooks (F) provided with the connecting metal fittings (8) are respectively attached to left and right uppermost ends of the ladder body (L). The second connecting fitting (8 ') for temporarily fixing the lower end of the elevating fall prevention device (B) is provided in the vicinity of the lower end of the ladder body (L). The ladder according to item 1.

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