JPS61254791A - Ladder structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a ladder structure.

Conventionally, when carrying out overhead line work, for example, a ladder was propped up against a utility pole to the required height, and from halfway up the pole, the work was carried out via a step rod that had been set up in advance from the pole. , At this time, the footrest is 1.8111~2 from the ground.
．． It is installed at the 5111 position, and therefore requires a ladder, but the installation of the ladder can be difficult depending on the site conditions, and climbing the pole is inconvenient and dangerous for workers. Met.

In the present invention, locking assemblies each having a required length are made to protrude from the upper ends of the left and right main pillars of the ladder, and the ends of the strings are provided with alternate feet protruding from both sides of the circumferential surface of the cylindrical pillar to which the ladder is attached. By forming locking portions to be locked to the rods, the hooks provide a ladder structure in which the ladder can be easily and securely attached to the cylinder via the strings.

Embodiments of the present invention will be described in detail based on the drawings. (A) shows a ladder for climbing poles, and (A) the ladder body (
1), a locking string (2), and a fixing assembly (
3), the main body of the ladder (1) has left and right main pillars (4), (4), which have a cross-sectional shape and a vertically elongated shape, and an opening (4) inward.
-1, (4) -1 are placed facing each other at the position itb, and the required number of treadles (5) are placed horizontally between the left and right main pillars (4), (4) while maintaining the required vertical spacing. In particular, only the treadle (5) located at the top is horizontally suspended on the same main pillars (4), (4) via the string support brackets (6), (6) on the left and right sides. The bracket (6) has an upper half (6)-1 having a U-shaped cross section, and is fitted and connected to the upper end of the main pillar (4), so that the upper half (6)-1 and the main pillar ( 4) to form a rectangular columnar space (7), and a rectangular opening (8) at the upper edge, and the lower half is formed into a downwardly convex curved surface, folded back, and threaded through the string. A folded receiving part (6)-2 is formed to receive the folded part of the body (2), and the end thereof is connected to the lower center of the horizontal pipe (5).

The threading string (2) is made flexible by surrounding the outer peripheral surface of a cloth string formed to the required length with vinyl chloride, etc., and has loop-shaped locking parts (2>-1°) at both ends. (2)-1 is formed, and the locking portion (2)-1° (2>-1 is connected to the ladder body (
1) They are inserted into the rectangular columnar spaces (7), (7) provided at the upper end from below, respectively, and are installed so as to protrude from the rectangular openings (8), (8).

Then, the locking part (2)-1, (2>-1) is attached to the cylinder (B
) are alternately protruded from both sides of the circumferential surface of the rods (C) and are pulled upward to engage the rods (C). 6) to support the ladder body (1) in a hanging state.

One end of the fixing string (3) is connected to the center of the left main pillar (4), and when the ladder body (1) is attached to the cylinder (B), it is wound around the circumference of the cylinder (B). The ladder main body (1) is fixed to the cylinder (B) by connecting the other end to the right main pillar (4) via a support ring (9) protruding from the center. .

(10) is a cylindrical abutting body, and the abutting body (10) is connected to the left and right support parts (10)-1, (10)-1 and the cylindrical abutting part (10)-2 formed into a concave curved surface. The support part (10
)-1, (10)-1 are the left and right main pillars (4) and <4, respectively.
＞ protrudes forward perpendicularly from the outer surface of the
0)-1, (10)-1 A cylindrical contact part (10)-2 is constructed in the dark so that the concave curved surface is located in front,
The concave curved surface of 0)-2 is constructed by connecting elastic rubber bodies (11), and the contact bodies (10) are provided protruding from the upper and lower parts of the ladder body (1).

In addition, the treadle (
5) is to open both ends (12) to establish communication, and to insert the middle part of the string (2) into the step piece (5) to support the ladder body (1) in a hanging state. It is also configured to be possible.

The embodiment of the present invention is configured as described above, and when performing the pole climbing work, the worker grasps the lower part of the ladder body (1) and lifts the left and right main poles (4).

(4) One of the locking portions (2)-1, (2>-1) of the threading string (2) protruding from the upper end is alternately protruded from both sides of the circumferential surface of the cylinder (B). Among the footrests (C), the second footrest from the bottom is locked to the support (C), and while maintaining this locked state, the footrest located at the lowest end is locked to the rod (C).
C), pull down the ladder main body (1), and lock the other locking part (2)-1 to the lowermost footrest (C),
Suspend the threading string (2) between the footrests (C) and (C) for the different steps, and in the same state, attach the ladder body (1) to the string support brackets (6) and (6) by folding them. Part (6)-2, (6
)-2, hang vertically from the folded part of the threading string (2), and furthermore, the cylindrical abutting bodies (10), (10)
is brought into contact with the circumferential surface of the cylinder (B), and the fixing string (
3) around the circumferential surface of the cylinder (B) to form the ladder body (1).
By securing the
The foothold can be lifted up to the pole (C) via the footrest 1), and at this time, the threaded string (2) in a suspended state becomes a handrail when climbing up the pole.

After completing the climbing and reciprocating work, perform the work opposite to the above-mentioned work of attaching the ladder body (1), and pull the folded part of the threading string (2) downward, and the locking part (2) - 1,<2)-1 is made to protrude from the upper end of the left and right main pillars (4), (4), and furthermore, the left and right side parts of the string (2) are the left and right main pillars<4),
(4), and may be housed through the openings (4)-1, (4)-1.

According to the present invention, both ends of locking strings having a required length are made to protrude from the upper ends of the left and right main pillars of the ladder, and the ends of the strings are attached to both sides of the circumferential surface of the cylinder to which the ladder is attached. The staggered protruding footrests each form a locking part to be locked to the bar, making it easy and reliable to install the ladder. Since it is possible to carry out pole climbing work, it has the effect of significantly improving work efficiency.

Furthermore, since it is structurally lightweight and simple, it has the advantage of being easy to carry.

[Brief explanation of the drawing]

FIG. 1 is a front view of a ladder according to the invention. Figure 2 is a side view of the ladder. Figure 3 is a plan view of the ladder. FIG. 4 is a view taken along the knee I line in FIG. 1. FIG. 5 is a front view showing the ladder in a stored state. FIG. 6 is a view taken along the line ■-■ in FIG. 2. FIG. 7 is a view taken along the line ■-■ in FIG. 3. (A): Ladder (1): Ladder main body (2) Double string (3): Fixing string (4) Two main pillars (5); Step rung (6): Strap support bracket Patent applicant Nakao Metal Ladder Manufacturing Co., Ltd. Agent Ken Matsuo - Department Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1) Both ends of a single locking string (2) having a required length are made to protrude upward from the upper ends of the left and right main posts (4), (4) of the ladder, and the same string (2) is The ladder is folded back at the folding receiving part (6)-2 at the upper end of the ladder, and at the tip of the string (2) there are hooks to be engaged with alternating leg rests protruding from both sides of the circumferential surface of the cylinder to which the ladder is attached. A ladder structure formed by forming stop portions (2)-1 and (2)-1, respectively.