JP3088931U - Ladder - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a ladder capable of performing stable work even at a high place. SOLUTION: A ladder main body 11 is formed of an aluminum channel steel having a U-shaped cross section, and first to fifth steps 22 to 26 for hanging limbs during climbing and descending are provided alternately on left and right side walls 21. A circular ring-shaped fixing member 31 is protruded from the side wall 21 of the ladder main body 11, and one end of a rope 32 to be wound around and fixed to an object is connected to the fixing member 31. An overlapping portion 41 overlapping with a lower end of the other ladder main body 11 is fixed to an upper end portion of the ladder main body 11, and the overlapping portion 41 is formed of a metal member having a U-shaped cross section which is fitted to the lower end.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a ladder used when climbing a high place.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 3, a tree 101 below a line of a power transmission line must keep a constant distance from a power transmission line 102 for equipment security. As a method therefor, there is known a centering method for cutting a tip portion of a tree 101 below the line, and the distance between the transmission line 102 and the tree 101 is kept constant.

[0003] In this centering work, it is necessary to climb the tree 101 below the line, but in general, a two-stage ladder, a pole climber, or the like has been used.

[0004]

[Problems to be solved by the invention]

 However, when a two-stage ladder is used, the height of the tree 101 that can be climbed is at most about 8 m, and the tree 101 exceeding this height could not be centered. In addition, the ladder standing on the ground was unstable and the workability was poor.

[0005] Further, in the case of using a pole elevator, a skill difference is likely to occur, and a fall disaster or the like may occur.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a ladder capable of performing a stable operation even at a high place.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, in the ladder according to the first aspect of the present invention, a plurality of elongated ladder bodies are provided with an extended portion extending laterally for hanging limbs when climbing or descending. The ladder main body is provided on both sides, and a fixing means for winding and fixing the ladder main body around the object is provided, while the other end of the other ladder main body is connected to one end of the ladder main body and overlapped with the other end. Part was provided.

That is, when climbing a tree using this ladder, the long ladder main body is arranged along the tree, and the fixing means provided on the ladder main body is used to move the object ladder to the tree. Wrap around and secure. The ladder climbs up and down with limbs on the extension that extends laterally from both sides of the ladder body.

At this time, if it is desired to climb to a higher position, the rear end of another ladder main body is connected to the upper end of the ladder main body, and the overlapping portion of the upper end of the ladder main body arranged below is placed above the ladder main body. It is piled on the ladder main body lower end. Thereby, the strength at the connecting portion is increased.

[0010] Next, the fixing means of the connected ladder main body is wound around a tree as an object and fixed. Thus, the lower end of the connected ladder main body is supported by the lower ladder main body, and is fixed to the tree by the fixing means. Then, climb the ladder with your limbs on the extension of the ladder body.

[0011] In the ladder of claim 2, the ladder main body is formed of a member having a U-shaped cross section in a transverse direction intersecting in the length direction, and the overlapping portion is formed by the other end of the ladder main body. It was composed of a separate member having a U-shaped cross section which was externally fitted to the portion.

That is, the ladder main body is formed of a member having a U-shaped cross section, and the strength is increased while reducing the weight. In addition, by contacting the tree with the opening side opening in a U-shape in cross section, side slippage and the like are prevented as compared with a case where a flat surface is brought into contact with a curved tree.

At this time, the overlapping portion at the upper end of the ladder main body is formed of a separate member that is fitted to the lower end portion of the ladder main body to be connected, and in the connected state, the overlapping portion having a U-shaped cross section is connected. The ladder body having a U-shaped cross section is fitted to the lower end of the ladder body. This prevents inadvertent rotation at the connecting portion.

Further, in the ladder of claim 3, each extension provided on both sides of the ladder main body is provided at a position shifted in the length direction of the ladder main body, and the ladder main body is supported by the ladder main body. The extension portions on both sides were set so as to be alternately arranged.

[0015] Thus, as compared with the case where the extending portions on both sides are provided at the same position, the weight can be reduced without impairing the usability.

In addition, in the ladder according to the fourth aspect, an insertion hole through which a connecting member is inserted is provided on a side surface of the overlapping portion, and the other end of the ladder body into which the overlapping portion is fitted. An insertion hole into which the connecting member inserted through the insertion hole is inserted.

That is, in a state where the ladder main body is connected, the connecting member is inserted into the insertion hole on the side surface of the overlapping portion, and the connecting member is inserted into the insertion hole on the side surface of the lower end portion of the ladder body on which the overlapping portion is fitted. I do. Thereby, the connection strength of both ladder members is increased.

Further, since the connecting member is connected in a state of penetrating the overlapping portion having a U-shaped cross section and the side surface of the ladder main body, a slight bending of the connected ladder main body along the bending direction of the tree is prevented. Permissible.

[0019]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a ladder 1 according to the present embodiment. The ladder 1 is connected to a plurality of ladders 1 and is used for, for example, a core fixing operation of climbing a tree below a power transmission line and cutting a tip portion thereof.

The ladder main body 11 of the ladder 1 is formed in a long shape as shown in FIGS. 1A and 1B, and a cross section in a transverse direction crossing the length direction is shown in FIG. As shown in FIG. 1 (c), it is formed of a U-shaped aluminum channel steel. The length dimension S of the ladder body 11 is set to 2 m as shown in FIG. 1A, and the width dimension W is set to 75 mm and the depth as shown in FIG. D is set to 40 mm.

The left and right side walls 21, 21 of the ladder main body 11 are provided with first to fifth steps 22 to 26, which are laterally extended portions for hanging limbs during climbing and descending. These steps 22 to 26 are formed by fixing a step bolt of M16 with a pair of nuts 27, 27 which sandwich the side walls 21, 21. The steps 22 to 26 provided on the left and right side walls 21, 21 are spaced apart from each other in the lengthwise direction of the ladder main body 11. The first to fifth steps 22 to 26 are arranged alternately. The distance R1 between the first step 22 and the second step 23 and the distance R1 between the fourth step 25 and the fifth step 26 are set to 450 mm. The distance R2 between the step 24 and the distance R2 between the third step 24 and the fourth step 25 is set to 500 mm.

The left and right side walls 21 and 21 of the ladder main body 11 have a circular ring shape between the first step 22 and the second step 23 and between the fourth step 25 and the fifth step 26. Are protruded, and one end of a rope 32,... Is connected to each of the fixing members 31,. By the rope 32, a fixing means for winding and fixing the object on the ladder main body 11 is formed.

An overlapping portion 41 overlapping the lower end of the ladder main body 11 is fixed to the upper end of the ladder main body 11 in a state where the lower end of the other ladder main body 11 is connected to the upper end of the ladder main body 11. The overlapping portion 41 is formed of a metal member having a U-shaped cross section which is fitted to the upper end of the ladder main body 11 and has an inner diameter which can be fitted to the lower end of the ladder main body 11 connected to the upper part. I have. As shown in FIG. 1B, insertion holes 44 through which bolt-shaped connecting members 43 (see FIG. 2) are inserted are formed in the left and right side surfaces 42, 42 of the overlapping portion 41. On the left and right side walls 21, 21 at the lower end of the ladder main body 11, on which the overlapping portion 41 is fitted, insertion holes 45, 45 for inserting the connecting members 43, 43 inserted through the insertion holes 44, 44 are opened. Have been. Thus, the connecting member 43 is configured to be able to penetrate the overlapping portion 41 of the ladder main body 11 arranged at the lower part and the lower end part of the ladder main body 11 arranged at the upper part.

In the present embodiment according to the above-described configuration, when the ladder 1 is used to climb a tree 71 as an object, as shown in FIG. While being arranged along the tree 71, two ropes 32, 32 provided on the ladder main body 11 are wound around the tree 71 and fixed as shown in FIG. Then, the ladder is climbed up and down with limbs sequentially in steps 22 to 26 extending from both sides of the ladder main body 11.

At this time, if it is desired to climb to a higher position, the rear end of another ladder main body 11 is connected to the upper end of this ladder main body 11, and the overlapping portion 41 of the upper end of the ladder main body 11 arranged below is moved upward. The ladder is placed on the lower end of the ladder main body 11. As a result, the strength at the connection portion can be increased.

Next, the ropes 32 of the connected ladder main body 11 are wound around the tree 71 and fixed. Thus, the lower end of the connected ladder main body 11 is supported by the lower ladder main body 11, and is fixed to the tree 71 by the ropes 32, 32. Then, the ladder main body 11 is sequentially climbed up and down with limbs in steps 22 to 26.

In this way, the ladder 1 can be extended to a required height by sequentially connecting the ladder bodies 11. For this reason, it is possible to climb to a higher position in accordance with the height of the tree 71 as compared with the related art in which the height that can be climbed even when a two-stage ladder is used is limited to about 8 m.

At this time, the overlapping portion 41 at the upper end of the lower ladder main body 11 can be overlapped with the connected upper ladder main body 11, and the strength at the connecting portion can be increased. The connected ladder bodies 11, 11 are connected to the ropes 32, 32. The ropes 32, 32 are wound around the tree 71 and fixed, so that the force applied to the ladder body 11 is reduced. 32 and can be dispersed in each ladder body 11. Further, the ladder main body 11 can be dispersed on the ground 81 on which the ladder main body 11 is erected. Further, the ladder main body 11 can be reliably prevented from running sideways with respect to the tree 71.

Therefore, all the forces applied to the ladder 1 are applied to the ground 81 on which the ladder 1 is erected, and only at this portion, it is possible to stabilize the installation state as compared with the conventional case in which the ladder 1 is supported. it can. Thus, stable work can be performed even at high altitudes.

In addition, since there is no operation of the equipment as in the case of using a pole elevator, there is no difference in skills, and a fall accident can be prevented.

Further, since the ladder main body is formed of an aluminum channel steel having a U-shaped cross section, it is possible to increase the strength while reducing the weight. Further, as shown in FIG. 2B, by contacting the tree 71 with the opening side opened in a U-shape in cross section, a flat surface is brought into contact with the curved tree 71. And skidding can be prevented. Thereby, the stability at the time of installation can be further enhanced.

At this time, the overlapping portion 41 at the upper end of the ladder main body 11 is formed of a metal member that is fitted to the lower end of the ladder main body 11 to be connected. However, the ladder main body 11 is externally fitted to the lower end of the connected ladder main body 11 having a U-shaped cross section. As a result, inadvertent rotation at the connection portion can be reliably prevented, and stability can be improved.

Further, the steps 22 to 26 on both sides are set alternately in a state where the ladder main body 11 is leaned against the ladder main body 11. For this reason, compared with the case where the respective steps 22 to 26 on both sides are provided at the same position, it is possible to contribute to weight reduction without impairing usability.

In addition, while the ladder main body 11 is connected, the connecting member 43 is inserted into the insertion holes 44, 44 of the side surfaces 42, 42 of the overlapping portion 41, and the connecting member 43 is fitted over the overlapping portion 41. By inserting the lower ladder body 11 into the insertion holes 45, 45 of the lower end side walls 21, 21, the connection strength between the two ladder members 11 can be increased.

The connecting member 43 is connected in a state of penetrating the side surfaces 21, 21 of the overlapping portion 41 having a U-shaped cross section and the side walls 21, 21 of the ladder main body 11. Slight bending along the bending direction of the eleven trees 71 can be allowed. Thus, the ladder 1 can be installed along the tree 71.

Each of the steps 22 to 26 is formed by a step bolt having a large diameter head 85. For this reason, at the time of climbing and descending, the hand rope can be hung on each of the steps 22 to 26, and a fall can be prevented. As a result, safety can be improved.

The hand rope is used by ascending and descending the right end and the left end with a step bolt alternately when climbing up and down to a high place such as a steel tower or a telephone pole. This is a safety device that can hold the body with this hand rope and is used for fall prevention.

[0038]

As described above, in the ladder according to the first aspect of the present invention, it is possible to extend the ladder to a required height by sequentially connecting the ladder bodies. For this reason, it is possible to climb to a higher position in accordance with the height of a tree as an object, as compared with the related art in which the height that can be climbed by using a two-stage ladder is limited to about 8 m.

At this time, the overlapping portion of the upper end of the lower ladder main body can be overlapped with the connected upper ladder main body, and the strength at the connecting portion can be increased. Then, since the fixing means is wound around and fixed to the tree as the object, each connected ladder main body applies the force applied to the ladder main body to each of the ladder main bodies through the fixing means provided on each ladder main body. Can be dispersed in the ladder body. It can also be dispersed on the ground where the ladder body is standing. Furthermore, it is possible to reliably prevent the ladder from moving sideways against trees.

Therefore, all the forces applied to the ladder are applied to the ground on which the ladder is raised, and only at this portion, the installation state can be stabilized as compared with the conventional ladder supporting. Thus, stable work can be performed even at a high place.

In addition, since there is no operation of the equipment as in the case of using a column ascending machine, there is no difference in skills, and a fall accident can be prevented.

In the ladder of the second aspect, since the ladder main body is formed of a member having a U-shaped cross section, the strength can be increased while reducing the weight. Furthermore, by contacting the tree with the opening side opened in a U-shape in cross section, it is possible to prevent side slippage and the like as compared with a case where a flat surface contacts with a tree having a curved surface. Thereby, the stability at the time of installation can be further enhanced.

At this time, the overlapping portion at the upper end of the ladder main body is formed of a separate member that is fitted to the lower end portion of the ladder main body to be connected. In the connected state, the overlapping portion having a U-shaped cross section is connected. The ladder body having a U-shaped cross section is fitted to the lower end of the ladder body. As a result, careless rotation or the like at the connection portion can be reliably prevented, and stability can be improved.

Further, in the ladder according to the third aspect, the extension portions on both sides are set alternately in a state where the ladder main body is leaned. For this reason, compared with the case where the extending portions on both sides are provided at the same position, it is possible to contribute to weight reduction without impairing usability.

In addition, in the ladder of the fourth aspect, the connecting member is inserted into the insertion hole on the side surface of the overlapping portion while the ladder main body is connected, and the connecting member is fitted over the overlapping portion. By inserting the ladder into the insertion hole on the side of the lower end of the ladder, the connection strength between the two ladder members can be increased.

Further, since the connecting member is connected in a state of penetrating the side surface of the superposed portion and the side surface of the ladder main body having a U-shaped cross section, the connected ladder main body is slightly connected to the tree in the bending direction. Bending can be tolerated. This makes it possible to install ladders along trees.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a use form of the embodiment.

FIG. 3 is an explanatory diagram used in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladder 11 Ladder main body 21 Side wall 22 1st step (extending part) 23 2nd step (extending part) 32 Rope (fixing means) 41 Overlapping part 42 Side surface 43 Connecting member 44 Insertion hole 45 Insertion hole 71 Tree (object) )

Claims (4)

[Utility model registration claims] 1. A long ladder body that is used by connecting a plurality of ladders, on both sides of which a ladder body is extended on a side where a limb is hung when climbing and descending, and the ladder body is wound around an object and fixed. A ladder characterized in that a ladder body is provided with an overlapping portion overlapping one end of the other ladder main body with the other end of the ladder main body being connected to one end of the ladder main body. 2. The ladder main body is formed of a member having a U-shaped cross section in a transverse direction intersecting the length direction, and the overlapping portion is externally fitted to the other end of the ladder main body. 2. The ladder according to claim 1, wherein the ladder is formed of a separate member. 3. Each of the extending portions provided on both sides of the ladder main body is provided at a position shifted in the longitudinal direction of the ladder main body. 3. The ladder according to claim 1, wherein the ladder is set so as to be staggered. 4. An insertion hole through which a connecting member is inserted is provided on a side surface of the overlapping portion, and the insertion hole is inserted through a side surface of the other end of the ladder body into which the overlapping portion is fitted. 4. The ladder according to claim 2, wherein an insertion hole into which the connecting member is inserted is provided.