JP2000248865A - Ladder fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ladder fixing device improved in safety of electric engineering work by constituting such that a ladder is fixed to an electric pole when it is leaned to the pole, and is removed by pulling a rope from the ground. SOLUTION: This ladder fixing device includes a first electric pole grasping member 14 placed at the distal end of a sliding shaft 12 provided on a frame, and a second electric pole grasping member 24 attached at both side distal ends of a frame via a first link 22, thereby connecting both the ends of the first grasping member 14 and the intermediate point of the first link 22 by a second link 25. The sliding shaft 12 is supported by a bearing metal piece 13, and a compression spring 15 is interposed between the first grasping member 14 and the bearing metal piece 13. Further, a torsional plate 16 and compression spring 17 are fitted in the bearing metal piece 13, and a rope 18 extends from a free end of the torsional plate 16. When a ladder is leaned to an electric pole, the grasping members 14, 24 work to grasp the electric pole, and the ladder is removed by pulling the rope so as to release grasped relation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder fixing device capable of safely performing electric work using a ladder.

[0002]

2. Description of the Related Art When electric work is performed on a pole, a ladder is used. However, the diameter of the pole is smaller than the width of the ladder. Therefore, as shown in FIG. 5, a contact member 27 made of a flexible material and provided with a non-slip 29 is attached to the upper end of the ladder 5.
The contact member 27 is applied to a utility pole 28, and a rope (not shown) is wrapped around the utility pole 28 from both side poles 3 of the ladder 5 and fixed.

[0003]

In the ladder fixing means as described above, the operator has to climb the unstable ladder in order to lean the ladder against the utility pole and hang the rope from both sides of the ladder. At that stage, unsafe work was forced.

[0004] In view of the above problems, the present invention, when the ladder leans on the utility pole, fixes the ladder to the utility pole, and after the work is completed, the ladder can be removed by pulling a rope from the ground, thereby greatly improving the safety of electrical work. It is an object to provide an improved ladder fixing device.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a frame provided with ladder side column gripping members at both ends and a direction perpendicular to a line provided on the frame and connecting the gripping members. A reciprocating sliding shaft, a first telephone pole gripping member attached to a tip of the sliding shaft, and a second pivotally attached via a first link connected to both ends of the frame. A power pole gripping member, and a second link connecting both ends of the first power pole gripping member and an intermediate point of the first link, wherein the sliding shaft is supported by a bearing fitting attached to the center of the frame. A pressing spring is fitted between the first telephone pole gripping member and the bearing fitting, and the sliding shaft is locked when the sliding shaft is inclined at a portion penetrating the bearing fitting and unlocked when the sliding shaft becomes vertical. The resilient plate and the pressing spring are fitted, Cords from the free end of the serial torsion plate is obtained by a structure comprising extended.

According to the present invention configured as described above,
When the rope is pulled, the stiff plate becomes perpendicular to the sliding axis and the stiff state is released, and the first power pole gripping member is pushed forward by the bias of the push spring, and connected to both ends thereof. When the second link pushes the intermediate point of the first link, the second telephone pole gripping member swingably attached to the free end of the first link also spreads.

In this state, when the ladder is leaned on the utility pole, the first utility pole gripping member retreats, and the second link connected to both ends of the first pole draws the intermediate point of the first link and swings to the free end of the first link. The distance between the movably mounted second utility pole gripping members is reduced to grip the utility pole, and the ladder is firmly fixed to the utility pole. When removing the ladder from the utility pole, pulling the rope from the ground spreads the utility pole gripping member as described above so that the ladder can be removed from the utility pole.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. At the back of both sides of the frame 2 which is provided with a gouging part 1 in the center and gradually narrowed from both sides,
A gripping member 4 for fixing the side pillar 3 of the ladder 5 is fixed at a leaning angle α of the ladder 5.

The gripping member 4 includes a side column receiver 6 having a U-shaped cross section, and a lid 8 attached to an opening of the side column receiver 6 by a hinge 7, and the lid 8 exceeds a dead point. And a turn hook 9 for fixing the hook state. The frame 2 is provided with a through hole 10 for weight reduction, and a rib 11 is provided around the frame 2 for reinforcement.

A sliding shaft 12 is mounted in the center of the frame 2 through a bearing 13 having a U-shaped cross section. A push spring 15 is fitted between the bearing 13 and the first telephone pole gripping member 14 to urge the first telephone pole gripping member 14 forward. It should be noted that the above-mentioned non-slip W is made of urethane foam W ₁ and the rubber sheet W _2, C is a cap.

A resilient plate 16 is fitted on the bearing 13, a pressing spring 17 is fitted behind the resilient plate 16, and a rope 18 is extended from a free end of the resilient plate 16. The rope 18 is attached to the bent portion 13a of the
Has passed through the rope guide hole 20 in which is fitted.

A first link 22 is connected to both ends of the cutout portion 1 of the frame 2 by pins 21, and a free end of the first link 22 is swingably non-slip W by a pin 23.
The second link 25 connected to both sides of the first telephone pole gripping member 14 is attached with the
Is connected to an intermediate point of the first link 22 by a pin 26. The non-slip W is made of urethane foam W ₁
And made of a rubber sheet W _2.

In the above embodiment, the frame 2 is provided with the digging portion 1, but the digging portion 1 is not provided. Thereby, a similar effect can be obtained.

Next, handling of the ladder fixing device 30 will be described. The cover 8 is opened by removing the turn hook 9 of the gripping member 4, the upper column 3 of the ladder 5 is fitted to the side column receiver 6, the cover 8 is put on, the turn hook 9 is hung, and the ladder fixing device 30 is connected to the ladder. Attach to the top of 5. At this time, ladder 5
When the contact member 27 provided at the upper end of the ladder 5 is brought into contact with the utility pole 28, consideration is made so that the leaning angle α of the ladder 5 matches.

As shown in FIG. 3, when the rope 18 is pulled, the resilient plate 16 becomes perpendicular to the sliding shaft 12 and is in a resilient state (the hole 16h of the resilient plate 16 is formed on the surface of the sliding shaft 12). The state in which the edge is hooked) is released, and the first telephone pole gripping member 14 moves forward by the urging of the push spring 15, and as shown in FIG. The second utility pole gripping member 24 swingably attached to the free end of one link 22 is also expanded.

When the ladder 5 is leaned against the utility pole 28 in a state where the first and second utility pole gripping members 14 and 24 are spread, the first utility pole gripping member 14 resists the urging of the pressing spring 15. Retracted, the second link 25 attracts the intermediate point of the first link 22 via the pin 23, and moves the second telephone pole gripping member 24 attached to the free end of the first link 22 in the direction of the arrow, As shown in FIG. 2, the utility pole 28 is firmly grasped.

When the electrical work is completed, the rope 1
8 is pulled against the urging of the pressing spring 17,
6 is at right angles to the sliding shaft 12 and the stiff state is released. When the ladder is raised in this state, the first power pole gripping member 14 moves forward by the urging of the pressing spring 15, and the second power pole gripping member 24 is expanded as described above so that the ladder 5 can be removed from the power pole 28. Become.

[0018]

As described above, according to the present invention, the ladder is fixed to the electric pole at the same time as the ladder leans on the electric pole,
When the electric work is completed, the ladder can be removed by pulling the rope from the ground, and the safety of the electric work can be greatly improved.

[Brief description of the drawings]

FIG. 1A is a plan view of an embodiment according to the present invention. FIG.

FIG. 2 is a plan view showing a state in which the device of the embodiment grips a utility pole.

FIG. 3 is a partially enlarged sectional view of FIG. 1;

FIG. 4A is a diagram showing a state in which a ladder is fixed by a ladder fixing device according to the present invention; FIG.

FIG. 5 is a diagram showing a state in which a ladder rests on a utility pole according to a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gouging part 2 Frame 3 Side pillar (of ladder) 4 Grasping member (of ladder side pillar) 5 Ladder 6 Side pillar receiver 7 Hinge 8 Cover 9 Turn hook 10 Through hole 11 Rib 12 Sliding shaft 13 Bearing bracket 14 First telephone pole gripping member 15 Push spring (of first telephone pole gripping member) 16 Resilient plate 17 Press spring (of resilient plate) 18 Rope 19 Sleeve 20 Rope guide hole 21 Pin (at both ends of frame) 22 First Link 23 Pin (of first link) 24 Second pole holding member 25 Second link 26 Pin (at first link midpoint) 27 Contact member 28 Power pole 29 Non-slip 30 Ladder fixing device C Cap W Non-slip

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeo Fujiki 14-15 Higashishirashima-cho, Naka-ku, Hiroshima-shi, Hiroshima Prefecture NTT Telecom Engineering Co., Ltd. China (72) Inventor Fumio Kanazaki Taisho-ku, Osaka 3-7-9 Kobayashi Higashi F-term (reference) 2E044 AA01 BA01 BA11 BB06 BC14 CA01 CB03 DA01 EE11

Claims (1)

[Claims] 1. A frame provided with ladder side pillar gripping members at both ends, a sliding shaft provided on the frame and reciprocating in a direction perpendicular to a line connecting the grasping members, and a leading end of the sliding shaft. An attached first telephone pole gripping member, a second telephone pole gripping member pivotally mounted via first links connected to both ends of the frame, and both ends of the first telephone pole gripping member And a second link connecting an intermediate point of the first link, wherein the sliding shaft is supported by a bearing fitting attached to the center of the frame, and the sliding shaft is connected to the first telephone pole gripping member and the bearing fitting. A push spring is fitted between the sliding shaft and a part where the sliding shaft penetrates the bearing bracket. A tilting plate that locks the sliding shaft when tilted and unlocks when the sliding shaft is vertical is fitted with a pressing spring, and the pressing spring is fitted. Ladder fixing device with a cord extending from the free end of the ladder Place.