JPH094349A - Ladder - Google Patents

Abstract

PURPOSE: To provide a ladder preventing a sway and capable of being stably used by pivotally fitting a coupling section coupled with the fixed step of a lifting object to one end of a main body stanchion, and pivotally fitting a lower support holding the interval between the lifting object and the main body stanchion to the other end. CONSTITUTION: A main body stanchion 1 is constituted of an inside pipe 1A and an outside pipe 1B different in the cross sectional size in the nest type, and its length can be adjusted when the stanchion 1 is expanded or shrunk. For use, the stanchion 1 is expanded, the coupling section 5A of a ladder is hooked on the crossbar of the lift ladder of the raising foundation of a steel tower, and the position of a moving step 2A is moved to a position easy to rise for a worker. A lower support 7 is pulled down in the direction perpendicular to the stanchion 1, and a fixing band is wound around the raising foundation to fix the other end of the ladder. The ladder is made the suspension type by the coupling section 5A, it can be surely connected to the fixed step of a lifting object, its swing can be prevented unlike the conventional leaning type ladder, and it can be stably used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder used for elevating concrete tower foundations and utility poles of steel towers.

[0002]

2. Description of the Related Art As shown in FIG. 13, when a concrete raising foundation 41 is provided on a transmission line tower 40, an ascending ladder 42 is fixed directly to the foundation 41. Therefore, the ascending ladder 42 is not installed about 3 m above the ground. Similarly, the electric pole also does not have a step bolt about 2 m above the ground.

For this reason, the ladder shown in FIG. 14 is used as an auxiliary for lifting work at such a place. This is a structure in which a plurality of crossbars 44 are fixed at appropriate intervals between pillars 43 arranged in parallel.At the time of ascending tower, this ladder is directly leaned against the concrete raised foundation 41 and reaches the ascending tower ladder 42. Go up.

[0004]

By the way, in such a conventional ladder, it is difficult to stably lean against a concrete raised foundation or an electric pole of a generally cylindrical steel tower, and in particular, the upper end portion is easily shaken, which is dangerous. . In addition, its large size makes it inconvenient to carry and store. Some of the ladders shown in FIG. 14 are of a telescopic type or a foldable type, and in these cases, the size can be reduced to some extent, but the size is still not enough to fit in the trunk of a passenger car or the carrier of a light van. Therefore, a carrier is installed on the ceiling of passenger cars,
Generally, a ladder is fixed and carried on it. The present invention has been made to solve such a problem, and an object thereof is to provide a ladder that is small and lightweight and can be stably used even on utility poles and the like.

[0005]

In order to achieve the above object, the ladder of the present invention is a ladder in which a plurality of steps are provided on a side portion of a main body column at appropriate intervals, and is used for raising and lowering objects such as raised foundations and utility poles. An engaging portion that engages with the fixing step of the object to be lifted is pivotally attached to one end of the main body column so that it can be used by hooking it on the fixing step provided on the object. Here, the fixing step refers to a scaffold for raising and lowering provided on an ascending / descending object, and corresponds to an ascending ladder in a concrete raised foundation and a step bolt in an electric pole. A lower support that holds the space between the lifting object and the main body support is pivotally attached to the other end of the main support.

As a concrete structure of the engaging portion, there is a hook-like structure which can be hooked on the fixing step. It is preferable to use a bifurcated hook to prevent the ladder from rattling and shaking during use. If the fixing step is an ascending ladder like a concrete raising foundation in a steel tower, a hook having two branches and equal branch lengths is preferable. On the other hand, if the step bolts are arranged alternately on both sides of the electric pole, it is preferable that the step bolts are bifurcated and the lengths of the respective branch portions are different so as to match the arrangement of the step bolts.

Further, it is preferable to provide a fixing band for winding around the object to be lifted at the other end of the main body column so that the ladder can be leaned more stably. This fixing band may be provided at the tip of the lower support. Further, for convenience of transportation and storage of the ladder, it is preferable that each step is pivotally attached to the main body column so that it can be folded.

[0008]

Embodiments of the present invention will be described below. (Embodiment 1) The ladder shown in FIG. 1 is suitable for climbing up a concrete raised foundation of a steel tower, and a plurality of steps 2 are provided on the side of a prismatic main body pillar 1.
The main body column 1 is composed of two rectangular pipes (inner pipe 1A and outer pipe 1B) having different cross-sectional dimensions in a nesting manner, and its length (maximum 2.02 m) can be adjusted by expanding and contracting.
This length adjustment is performed by providing a plurality of through-holes (not shown) in the inner pipe 1A at one position at one end of the outer pipe 1B of the main body strut at predetermined intervals and penetrating the fixing pin 3 into this through-hole. .

In order to prevent the fixing pin from coming off, it is preferable that the tip of the pin be bent. For example, at the tip of the pin, a short shaft of approximately the same diameter is pivotally attached,
It is configured so that it can be bent by rotating. When penetrating the main body column, the pin and the short shaft may be positioned on a straight line, and after penetrating, the short shaft may be rotated in a direction intersecting with the pin. Since the fixing pin is connected to the main body by a chain, a pin holder is provided on the main body so that the fixing pin does not wander when not in use. As shown in FIG. 2, the pin holder has metal pieces 11 facing each other, each having a curved surface corresponding to the outer diameter of the pin. Push the pin between both metal pieces 11
Hold pin 3 with elasticity of 11.

In order to prevent the inner pipe 1A from coming off, an engaging protrusion is provided on the inner pipe 1A, and a rectangular hole with which the engaging protrusion engages is formed at the end of the outer pipe 1B. As shown in FIG.
One end of a leaf spring 12 is fixed to the inner surface of the inner pipe 1A, and a thin block-shaped engaging projection 13 is fixed to the other end of the spring 12. Here, the edge of the engaging projection 13 on one end side of the leaf spring is configured by a ridge line of two planes that are in contact with each other at a right angle. It is formed thin toward. Further, a rectangular hole 15 is formed on the other end side of the inner pipe 1A (the other end side of the leaf spring on the side opposite to the engaging portion mounting end described later), and the engaging projection 13 is formed in the rectangular hole 15. It is fitted and protrudes on the surface of the inner pipe 1A. Then, the outer pipe 1B into which the inner pipe 1A is fitted
A rectangular hole 16 (see FIG. 1B) corresponding to the engaging projection 13 is also formed on one end side of the.

When such an inner pipe 1A is housed in the outer pipe 1B, the engaging projections 13 are in sliding contact with the inner surface of the outer pipe and are retracted into the inner pipe. Inner pipe 1A from this state
When is pulled out, the engaging projection 13 projects from the inner pipe 1A at the position of the rectangular hole 16 of the outer pipe and fits into the rectangular hole 16. At this time, the one end side edge of the engaging projection 13 comes into contact with the rectangular hole 16 of the outer pipe to prevent the inner pipe 1A from being pulled out. On the other hand, when the inner pipe 1A is housed in the outer pipe, the rectangular projection 16 of the outer pipe slides into contact with the inclined surface 14 of the engaging projection to retract the engaging projection 13.

Further, in the ladder of this example, the outer pipe 1B
If shoulder straps (not shown) having attachment ends on one end side and the other end side are provided, it is convenient to carry.

On the other hand, steps 2A and 2B are places where the worker rests his legs when climbing the ladder. In this example, a block-like member having a flat upper surface on which a foot is placed and an inclined lower surface, and is formed thin from one end to the other end is a main body column 1
Staggered on both sides of 2 from the top in FIG.
Only the second step 2A is a movable type that slides along the inner pipe 1A, and when used, it is moved to an appropriate position where an operator can easily put his / her foot on it in accordance with the expansion / contraction of the main body column 1.

In this movable step, as shown in FIG. 4, a frame-shaped slider 4 is fitted onto an inner pipe 1A, and a step 2A is pivotally attached to this slider 4. Step 2A
A shaft hole (not shown) is formed at one end of the
17 is penetrated. Also, the one end side corner 18 connected to the step upper surface is formed in a round shape, and the shaft hole is formed in an elongated hole parallel to the step upper surface, and when step 2A is rotated,
The corner 18 is configured so as not to contact the inner pipe 1A.

Further, an L-shaped hanging member 19 is projectingly provided on one end face of the step which comes into contact with the inner pipe 1A when it is rotated so as to fix the position of the step 2A. In this, a rectangular hole 20 (see FIG. 3) is provided at an appropriate position of the inner pipe 1A, a hanging tool 19 is fitted therein, and the step 2A is positioned by engaging the opening edge of the rectangular hole 20.

Steps 2B other than the above are all carried out on the main body column 1.
It is directly pivotally attached to and can be folded as shown in FIG. As in the movable step 2A, the step 2B also has a rounded corner 21 on the one end side which is connected to the upper surface of the step, as in the movable step 2A. However, the axial hole was formed in the long hole 22 which was not parallel to the upper surface of the step. The long hole 22 has one end side close to the upper surface and the other end side separated from the upper surface. Therefore, at the time of folding, the upper surface of the step comes into contact with the main body column 1 and the other end of the long hole 22 comes into contact with the rotary shaft 23. In this state, the corner 21 comes close to the main body support 1, and even if the step 2B is to be rotated as it is, the corner 21 comes into contact with the main body support 1 to hinder the rotation, so that the folded state can be maintained. .

On the other hand, when the step 2B is rotated, the step 2B is pulled up along the long hole and the step end side of the long hole 22 is brought into contact with the rotary shaft 23. As a result, the corner 21 is separated from the main body support 1, so that the corner 21 does not contact the main support 1, and the step 2B can be rotated without any trouble.

Further, a backing plate 24 is provided on one end surface of the step, and when the backing plate 24 is rotated, it comes into contact with the main body support 1 to stabilize the step 2B. The fixed step 2B may be arranged at appropriate intervals so that the operator can easily climb up.

One end of such a main body pillar, that is, an inner pipe
An engaging portion 5A for hooking the ladder on the crossbar of the elevating ladder is pivotally attached to the tip of the 1A. This is a bifurcated, substantially A-shaped one in which branch portions of equal length are connected by a reinforcing piece 6, and the tip of each branch portion is bent to form a hook shape. As shown in FIG. 1 (A), the engaging portion 5A has a pivotal portion 10 provided at the tip of the main body strut 1 as a base point, and extends from the longitudinal direction of the main body strut 1 (in use) to the same figure (C). ), The reinforcing piece 6 is configured to be rotatable over a range of about 180 ° until it comes into contact with the main body column 1 (folded state).
The engaging portion 5A of this example has a length of 30 cm, and the maximum length of the entire ladder when the engaging portion 5A is in use is 2.32 m.

The details around the pivot portion will be described with reference to FIGS. 6 and 7. The pivot part 10 is, as shown in FIG.
1A, the pivotally mounted recess 10A fitted in the tip, and this recess 10A
It is composed of a block-shaped pivoting convex portion 10B (shown by a broken line) that is fitted into and is penetrated by the rotating shaft 33. Where the pivot recess 10
The upper end surface of A has a substantially rectangular leaf spring with one side warped.
25 is mounted so as to protrude from the pivot recess 10A. This is when the engaging portion 5A is rotated to be in use,
The corner of the pivotally projecting portion 10B engages with the protruding portion of the leaf spring 25 to hold the engaging portion 5A in a used state. Further, the pivoting convex portion 10B is a block-shaped member to which the respective branch portions of the engaging portion 5A are joined, and although not shown, the joint portions of the respective branch portions are screwed to the engaging portion. The head of the screw is protruding.

On the other hand, a stopper 26 shown in FIG. 7 is attached to the surface of the tip of the inner pipe. This is the engaging part 5A
This is for holding this along the main body column when the is folded. A T-shaped leaf spring is attached to one end surface of the thin block body 27.
28 is abutted, the tip of this leaf spring 28 is rounded,
Make up 29. Furthermore, 2 which penetrates this leaf spring 28
A bolt 30 of a book is screwed into the block body 27, and a compression spring 31 is externally fitted to each bolt 30. Therefore, the elasticity of the compression spring 31 allows the bent portion 29 of the leaf spring to easily swing. Then, such a stopper 26 is provided with a compression spring 31.
Is fixed to the outer pipe side with a screw 32 at the center of one side surface of the inner pipe.

When the engaging portion 5A is folded, the bent portion 29 at the tip of the leaf spring engages with the head portion of the screw protruding from the pivotally protruding portion 10B, thereby holding the engaging portion 5A along the main body column. . The engaging portion 5A can be removed by pulling out the rotary shaft 33, and can be replaced with the engaging portion 5B of Embodiment 2 described later.

On the other hand, as shown in FIG. 8, a lower support 7 is provided at the other end of the main body column, that is, at the tip of the outer pipe in order to maintain a distance between the ladder and the object to be lifted (raised foundation). This is a support rod 7A pivotally attached to the main body strut 1 provided with an abutting plate 7B in contact with the raised base at the tip, and is configured to be rotatable within a range of 90 ° with respect to the main body strut 1 when stored. Can be folded. The length of the lower support 7 may be appropriately set so as to reach the lifting target when the ladder is attached to the fixed step. In this example, the length is 35 cm. Further, the contact plate 7B is preferably one that conforms to the shape of the contact surface to be lifted and lowered, and in this example, a metal plate having a cylindrical surface was used. Other,
[A metal plate bent into a mold may be used.

Further, the folded lower support 7 is attached to the main body column 1.
A ball plunger was used to hold it in the state of being aligned with. As shown in FIG. 9, a compression spring 35 built into the case 34 presses a part of the steel ball 36 so that the steel ball 36 projects from the case 34. It is fixed toward the other end of 1B. A hemispherical recess is formed on the contact plate surface of the lower support 7, and when the lower support 7 is folded, the steel ball 36 is fitted into the recess to hold the lower support 7 in the folded state. .

Further, as shown in FIG. 8, a fixing band 8 is provided at the other end of the main body column 1. This is a strip that is wound around an object to be lifted and fixed to stabilize the lower part of the ladder. As shown in FIG. 1 (B) and FIG. 10, [a metal mold 9 is fixed to form a through hole on the surface of the main body column on which the lower support is pivotally attached, which is just opposite to the side surface, and the fixing band 8 is formed there. It is inserted. The fixed band 8 wound around the lifting object is
The other end of the ladder is tied to the object to be lifted in the form of a loop, which may be tied at both ends of the fixing band at appropriate positions, or a buckle or the like may be used to form a loop of a predetermined size.

As shown in FIG. 10, the ladder having the above-mentioned construction is used by hanging the engaging portion 5A of the ladder of the present invention on the cross bar of the elevating ladder 42 fixed to the raised foundation 41 and hanging it.
In use, the main body column 1 is extended and adjusted to a predetermined length that reaches the elevating ladder 42, and then the position of the movable step 2A is moved to a position where an operator can easily climb and fixed. Of course, at this time, all the steps are tilted in the direction orthogonal to the main body column 1. Further, the lower support 7 is also tilted in a direction orthogonal to the main body pillar, and the contact plate 7B at the tip is raised and applied to the foundation 41. Then, the fixing band 8 is wrapped around the raised base 41 to fix the other end of the ladder.

In this way, by using the ladder of the type that is hung at the engaging portion, the fixing step for the object to be raised and lowered (the climbing ladder 4
2) It can be securely connected and can be prevented from swaying like a conventional leaning type ladder. In particular, if the lower support 7 and the fixing band 8 are used together, the entire ladder can be firmly stabilized.

After use, the main body column 1 can be shortened as shown in FIG. 1C, and the engaging portion 5A, the lower support 7, and all steps 2 and 2A can be folded to reduce the size. It is convenient for storage. In the case of the present embodiment, the dimensions when folded are 132 cm in length and the maximum width (engagement portion).
Since it is as small as 30 cm, it can be put on the trunk of passenger cars or the bed of light vans, which is very convenient. further,
Since the ladder of this example has only one main body pillar and the weight is 8.4 kg, which is relatively light, it does not cause much trouble when the operator carries it. The fixing band 8 may be stored by being wound around the main body support 1, or may be pulled out from the insertion hole and stored separately from the main support 1.

(Embodiment 2) Next, a preferred embodiment for climbing a utility pole or the like will be described with reference to FIG. The structure of the main body column 1, the step 2, and the lower support 7 is the same as that of the first embodiment, but the structure of the engaging portion is different. Therefore, the structure of the engaging portion will be mainly described here, and the description of the other structures will be omitted.

The engaging portion 5B in this example can be replaced with the engaging portion 5A in the first embodiment. As shown in FIG. 11, like the engaging portion 5A of the first embodiment, it is pivotally attached to the main body column 1 and has an overall V-shaped bifurcated shape with its tip bent in a hook shape. Further, the lengths of the bifurcated branches are different. This is the step bolt 46 on the utility pole
Is fixed alternately on both sides of the electric pole 45 as shown in the figure, so that the hook at the tip of the engaging portion can be hooked on the step bolt 46 in conformity with this arrangement.

Further, it is preferable that the engaging portion is made of, for example, a seamless tube formed by braiding a metal wire. This is because each branch is made of a flexible material so that the degree of opening of the branch can be adjusted and that the ladder can be stably hung by placing the branch along the surface of the utility pole, which is a cylindrical surface. This is because

In such a ladder, the main body column 1 is adjusted to a predetermined length, and the step portion 46 of the electric pole 45 is hooked with the engaging portion 5B as shown in FIG. At this time, unlike the first embodiment, the lower support 7 may remain folded. Further, if the fixing band 8 is wound around the utility pole 45, the whole ladder is further stabilized, but in this example, the ladder is directly connected to the utility pole 45.
Since they are in contact with each other, the use of the fixing band 8 does not hinder the use.

At the time of storage, the main body support 1 is shortened as shown in FIG. 11C, and the engaging portion 5B, the lower support 7, and all the steps 2 and 2A are folded to reduce the size. At this time, the engaging portion 5B is folded by narrowing the interval between the branch portions. Also in this example, the dimensions when folded are 132 cm in length and 8.4 k in weight.
g.

[0034]

As described above, according to the ladder of the present invention, since it is used by hanging it directly on the fixed step of the object to be raised and lowered, it is stable against the concrete raised foundation of the tower or the cylindrical one such as the utility pole. Can be used. Moreover, the ladder can be further stabilized by using a lower support or a fixing band. Furthermore, if the engaging part, the lower support, and the steps are folded, the size can be reduced to such an extent that it can be placed on the trunk of a passenger car or the luggage carrier of a light van.
Very convenient for transportation and storage.

[Brief description of drawings]

FIG. 1 shows a ladder of the present invention suitable for raising and lowering a raised foundation, (A) is a front view, (B) is a side view, and (C) is a front view when folded.

2A and 2B show a holder of a fixing pin used in the ladder of the present invention, FIG. 2A being a front view and FIG. 2B being a bottom view.

FIG. 3 shows an inner pipe which constitutes the ladder of the present invention,
(A) is a side view and (B) is a sectional view.

4A and 4B show movable steps, where FIG. 4A is a left side view, FIG. 4B is a front view, and FIG. 4C is a right side view.

5A and 5B show fixed steps, FIG. 5A is a front view, FIG. 5B is a right side view, and FIG. 5C is a bottom view.

6A and 6B are views showing a pivotally connected portion at the tip of an inner pipe, FIG. 6A being a left side view and FIG. 6B being a front view.

FIG. 7 shows a stopper at the tip of the inner pipe, (A)
Is a front view, and (B) is a side view.

FIG. 8 is a perspective view showing a usage state of a lower support of the ladder and a fixing band in FIG.

9A and 9B show a ball plunger for fixing a lower support, FIG. 9A being a front view and FIG. 9B being a side view.

FIG. 10 is an explanatory diagram when the ladder of FIG. 1 is used for raising and lowering a concrete raising foundation of a steel tower.

FIG. 11 shows a ladder of the present invention suitable for raising and lowering a utility pole, (A) is a front view, (B) is a side view, and (C) is a front view when folded.

12A and 12B are explanatory views when the ladder of FIG. 11 is used for raising and lowering a utility pole, FIG. 12A is a front view, and FIG. 12B is a side view.

FIG. 13 is a perspective view showing a steel tower and its concrete raising foundation.

FIG. 14 is a perspective view of a conventionally used ladder.

[Explanation of symbols]

1 Main body support 1A Inner pipe 1B Outer pipe 2 Step 2A Movable step 3 Fixed pin 4 Slider 5A
Engagement part 5B Engagement part 6 Reinforcement piece 7 Lower support 7A Support rod 7B Abutment plate
8 Fixing band 9 [Metal fitting 10 Pivot part 10A Pivot part concave part 10B Pivot part convex part 11 Pin holder 12 Leaf spring 13 Engagement part 14 Inclined surface 15 Rectangular hole 16 Rectangular hole 17 Rotating shaft 18 Corner 19 Hook 20
Rectangular hole 21 Corner 22 Long hole 23 Rotating shaft 24 Abutment plate 25 Leaf spring 26
Stopper 27 Block body 28 Leaf spring 29 Bending section 30 Bolt
31 Compression spring 32 Screw 33 Rotating shaft 34 Case 35 Compression spring 36
Steel ball 40 Iron tower 41 Concrete raised foundation 42 Ascending ladder 43 Pillar
44 Yokogi 45 Power pole 46 Step bolt

Claims (4)

[Claims] 1. A ladder in which a plurality of steps are provided at appropriate intervals on a side portion of a main body column, and an engaging portion which engages with a step of fixing an ascending / descending object is pivotally attached to one end of the main body column. A ladder characterized in that a lower support for holding a space between the lifting object and the main body column is pivotally attached to an end of the ladder. 2. The ladder according to claim 1, wherein the engaging portion is bifurcated, and the length of each branch portion is different so as to match the arrangement of the fixing steps. 3. The ladder according to claim 1, further comprising a fixing band wound around an object to be raised and lowered at the other end of the main body column. 4. The ladder according to claim 1, wherein each step is pivotally attached to a main body column and is configured to be foldable.