KR20150024047A

KR20150024047A - Ladder for manhole

Info

Publication number: KR20150024047A
Application number: KR20130100994A
Authority: KR
Inventors: 권해국; 고유민
Original assignee: (주)케이에스제이이엔씨; 고유민
Priority date: 2013-08-26
Filing date: 2013-08-26
Publication date: 2015-03-06

Abstract

The present invention relates to a ladder for entering a manhole for a safety handle to be quickly and easily installed when entering a manhole. To achieve this, the present invention comprises: an inner ladder (10) fixedly installed in an inner side wall of a manhole (11); a lifting handle (20) making a pair on both sides of the inner ladder (10) in order for the height to be vertically controlled; a handle guide (30) fixedly installed in the inner side wall of the manhole to guide the height adjustment of the lifting handle (20); and a clamp level (40) screwed in the handle guide (30), selectively pressurizing and fixing the lifting handle (20), and releasing virtual pressure.

Description

{LADDER FOR MANHOLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole entrance ladder, and more particularly, to a ladder installation structure for allowing a worker to perform manhole entrance and exit more safely and easily.

Generally, in the case of a plurality of manholes for maintenance and management of electric wires, communication cables or various underground conduits, a ladder is provided at one side of a side wall of the manhole so that an operator can enter the manhole. The length of the conventional ladder which is fixedly installed is fixed to a certain length, which means that the highest position of the ladder must be located inside the manhole considering the closure of the manhole cover, so that the operator opens the manhole cover, In order to enter, it falls down in a very dangerous state, stabbed the foot, stepped down a ladder, stepped down, and then with the lower half of the body entering the manhole, the ladder can be safely entered into the manhole In this case, the operator enters the inside of the manhole or the manhole Whenever it comes down to the floor, it is always in a state of being unstable in a state of lying on the road surface. In addition, it is necessary not only to take a pair of feet on the ladder but also to lead to the occurrence of a safety accident There was a problem.

In order to solve such a problem, in the Utility Model Application No. 1998-8513, a technique has been proposed for facilitating manhole entry and exit of a worker by fixing a ladder to a side wall of a manhole.

However, the manhole ladder according to the above-mentioned prior art has a structure in which the auxiliary ladder which is variable in height is connected to the top of the injection bridge. When the auxiliary ladder is raised, the support is supported by the injection leg at the bottom, There is a problem that the worker who enters and exits the manhole feels psychological anxiety.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art described above, and it is an object of the present invention to provide a stable support state when installing a ladder so that a manhole can be easily and safely handed out.

In order to achieve the above object, the present invention provides a manhole ladder comprising: an inner ladder fixedly installed on an inner side wall of a manhole; A lifting handle provided on both sides of the inner ladder so as to be vertically adjustable in height; A handle guide fixed to an inner side wall of the manhole for guiding the height adjustment of the elevating handle; And a clamp lever which is provided on the pull guide and selectively clamps the lift handle or releases the pressing force.

According to the present invention, it is possible to quickly and easily install the safety handle at the time of entering and exiting the manhole, thereby providing a safer manhole work.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a manhole access ladder according to an embodiment of the present invention. FIG.
2 is a front view of a ladder for accessing a manhole according to the present invention when stored.
3 is a plan view of a ladder for accessing a manhole in accordance with the present invention.
4 is a detailed structural view of the clamp lever mounting portion in the present invention.
FIG. 5 is a side view of a manhole entrance ladder according to the present invention. FIG.
6 is a front view of a manhole entrance ladder according to the present invention.
7 is a plan view of a ladder for accessing a manhole according to the present invention.
FIG. 8 is a plan view of a state before engaging with a handle of a handle according to another embodiment of the present invention; FIG.
FIG. 9 is a plan view showing a state of engagement of a handle and a rotary shaft according to another embodiment of the present invention; FIG.
FIG. 10 is a detailed structural view of a recess according to another embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 7, an inner ladder 10 is fixedly installed on an inner side wall of a manhole 11, and an inner ladder 10 of the inner ladder 10 On both sides, elevation knobs 20 are vertically adjustable. In order to guide height adjustment of the elevation knob 20, a knob guide 30 is fixed to the inner side wall of the manhole.

4, the clamp lever 40 for screwing the elevating handle 20 selectively to the handle guide 30 or releasing the pressing force is screwed to the handle guide 30.

Particularly, the elevating handle 20 is formed with a curved surface portion 21 having a predetermined curvature so that one end of the elevating handle 20 can be brought into contact with the ground at the time of elevation. At one end of the elevating handle 20, It is preferable that the protection cap 22 be fitted.

Then, the elevation knob 20 is supported so as to be rotatable by the knob guide 30.

The operation and effect of the use of the manhole access ladder according to the present invention having the above-described structure will be described.

First, when the ladder is stored, the lifting handle 20 is kept in a lowered state as shown in FIGS. 1 to 3. At this time, the lifting handle 20 is lifted up so as not to interfere with the inner ladder 10 And stored in a state rotated so as to face each other.

When the ladder is to be used for manhole access, the lifting and lowering handle 20 is lifted and used.

5 to 7, the lifting and lowering handle 20 supported by the pull guide 30 is lifted and raised, and then one end of the slip prevention cap 22 is seated on the floor surface The operation of installing the ladder is completed by turning the knob guide 30 by 90 degrees about the axis.

When the installation is completed as described above, the clamp lever 40 provided on the handle guide 30 is tightened to press the lift grip 20, thereby preventing the movement of the lift grip 20, It can be understood that the manhole can be securely taken in and out through the inner ladder 10 while holding the elevating handle 20.

When the manhole entrance / exit work is completed, the clamp lever 40 is unlocked and then the elevation handle 20 is rotated 90 degrees back to the original position. When the elevation handle 20 is lowered to the original position, Descending.

Therefore, according to the present invention, the elevating handle 20 can be installed quickly and easily in the manhole entrance, so that the operator can safely enter and exit the manhole.

8 and 9 illustrate a configuration according to another embodiment of the present invention. In the one end portion of the elevating handle 20 which is brought into contact with the ground, an interval between the two side elevating knobs 20 is fixed, It is confirmed that the handle insertion groove 51 is formed in a symmetrical shape so that the elevating handle can be inserted into both ends of the handle rotation and diaphragm 50 have.

When the handle pivoting diaper 50 is used, the distance between the two side lift pins 20 is constantly held by the handle pivoting diaphragm 50, so that the clamp lever 40 is loosened during the course of use, So that a phenomenon that the lifting handle 20 is rotated can be prevented from occurring, thereby preventing the occurrence of a safety accident in advance.

10 shows a structure according to another embodiment of the present invention. In the lower end portion of the elevation handle 20, an escape prevention bolt 23 for preventing the escape from the pull guide 30, And an elastic spring 24 for absorbing an impact force against the bottom of the manhole is formed on the bottom surface of the lower end of the lifting handle 23. [

With such a structure, it is possible to prevent the structure from being lost because the phenomenon that the elevation handle 20 is pulled out of the handle guide 30 when the elevation handle 20 is pulled up is prevented, and the elevation handle 20 is lowered The impact to the manhole bottom surface is absorbed by the elastic spring 24, thereby showing the advantage that the damage and deformation of the structure can be prevented.

Although specific embodiments of the present invention have been illustrated and described above, it is obvious that the device structure of the present invention can be variously modified by those skilled in the art.

It should be understood, however, that such modified embodiments are not to be understood individually from the spirit and scope of the invention, and such modified embodiments are intended to be included within the scope of the appended claims.

10: Internal ladder 11: Manhole
20: lift handle 21:
22: slip prevention cap 23: release prevention bolt
30: handle guide 40: clamp lever

Claims

An inner ladder 10 fixed to the inner side wall of the manhole 11;
A lifting handle 20 provided at both sides of the inner ladder 10 so as to be vertically adjustable in height;
A handle guide (30) fixed to the inner side wall of the manhole for guiding the height adjustment of the elevation handle (20);
A clamp lever (40) screwed to the pull guide (30) to selectively press and fix the lift handle (20) or release the pushing force;
And the ladder for manhole entrance and exit.

The method according to claim 1,
Wherein the elevating handle (20) is rotatably supported by a handle guide (30).

The method according to claim 1,
The elevating handle 20 is formed with a curved surface portion 21 having a predetermined curvature so that one end of the elevating handle 20 can be brought into contact with the ground when the elevating handle 20 is lifted and an end portion of the elevating handle 20, And a cap (22) is fitted in the ladder.

The method according to claim 1 or 3,
A handle pivoting diaphragm 50 is fastened to one end of the elevating handle 20 which is in contact with the ground to prevent the elevating handle from rotating by fixing a gap between the elevating knobs 20, Wherein a handle insertion slot (51) is formed in a symmetrical shape so that an elevating handle can be inserted into both ends of the handlebars (50).

The method according to claim 1,
The lower end of the elevating handle 20 is provided with a detachment prevention dam 23 for preventing the detachment of the handle from the handle guide 30 to prevent theft, And an elastic spring (24) for absorbing the impact force with the surface.