JPH0932273A - Ladder with rear guard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To erect rear guards of all stages from a ladder main body on use and fold and prostrate them in nonuse by connecting the rear guards of a plurality of stages to both side sections of a ladder main body, and making the rear guards of all stages manually foldable against the ladder main body. SOLUTION: Rear guards 3 are fitted at prescribed intervals to stanchions at both end sections of a ladder main body 2, and they are made rotatable by 90 deg. from vertically downward along the ladder main body 2. When the rear guards 3 are vertically lifted and erected from the ladder main body 2, they protect a worker vertically moving on the ladder main body 2. When the rear guards 3 are folded and prostrated along the ladder main body 2, they do not obstruct the carry-in of a drilling machine. The whole rear guards 3 fitted at prescribed intervals to stanchions at both side sections of the ladder main body 2 are connected by connecting rods 4. When the worker applies force in the vertical direction to the connecting rods 4, the whole rear guards 3 can be concurrently moved in the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder with a rear guard that is laid along the inner wall of a shaft in civil engineering work.

[0002]

2. Description of the Related Art Conventionally, at a construction site of a shaft for civil engineering, a ladder without a rear guard is used as a ladder to be laid along the inner wall of a shaft excavated in advance when the shaft is shallow. . However, when the vertical shaft is deep, a ladder with a rear guard, in which rear guards are fixed at predetermined intervals on both sides of the ladder body, is often used in order to ensure the safety of workers.

FIG. 4 shows a conventional ladder with a rear guard, in which (a) is a side view and (b) is a front view.
51 is a ladder with a rear guard, 52 is a ladder body, 52a
Is a column, 52b is a step, and 53 is a rear guard.
As shown in FIGS. 4A and 4B, the ladder 51 with rear guards has a plurality of stages of rear guards 53, ... Fixed to both sides of the ladder body 52.

The ladder main body 52 is composed of a step 52b on which an operator rests his feet, and columns 52a, 52a to which both ends of the step 52b are connected, respectively, so that the operator can go up and down. Has become. Rear guard 5
Reference numeral 3 denotes a rectangular frame in plan view fixed to both side surfaces of the ladder main body 52 at a predetermined interval, and an operator who moves up and down the ladder main body 52 is protected by going through the frame.

Thus, by installing the ladder 51 with the rear guard on the inner wall of the vertical shaft, it is possible to give a sense of security to the worker and to allow the worker to safely climb up and down.

[0006]

However, in the ladder 51 with the rear guard, when the ladder 51 with the rear guard is not used, for example, to further excavate the vertical shaft or to open a horizontal hole from the vertical shaft, When loading machinery used for excavation, earth and sand discharged from excavation, materials required for excavation, etc. from the opening of the vertical shaft, multiple stages of rear guards 53, ... surround the ladder main body 52 in advance. Since they are fixed, the multi-tiered rear guards 53, ...

[0007] Therefore, an object of the present invention is to install along the inner wall of the shaft, and to protect the worker who moves up and down by raising all stages of rear guards from the ladder body when in use, and when not in use, the ladder body It is to provide a ladder with rear guard that can be loaded with machinery etc.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is a ladder with a rear guard installed on the inner wall of a shaft at a construction site of civil engineering, etc. A ladder main body that is laid vertically along the main body, a plurality of rear guards that are connected to both sides of the ladder main body at predetermined intervals, and that are capable of undulating, and connecting rods that connect all the rear guards. And a structure in which the rear guards in all stages are manually foldable with respect to the ladder body. In this way, in the ladder with rear guard installed along the inner wall of the vertical shaft, the operator operates the specific rear guard or the connecting rod in the vertical direction, so that the rear guards of all stages interlock, The rear guard can be erected or prostrated against the ladder body. Therefore, at the time of use, the rear guards of all stages should be raised simultaneously with respect to the ladder body,
It is possible to protect workers climbing up and down the vertical shaft, and when not in use, the rear guards of all stages can be folded along the ladder body at the same time and laid flat so that machinery etc. can be carried into the vertical shaft.

According to a second aspect of the present invention, in the ladder with rear guards according to the first aspect, further, a manual assisting means (for example, a wire) for reducing a manual operation force required for raising and lowering the rear guards in all stages. , A balance weight, and a manual auxiliary unit composed of a rotary pulley). In this way, the manual auxiliary means
By reducing the operating force, the operator can easily manually raise and lower the rear guards of all stages. Therefore,
The rear guards of all stages can be easily raised and lowered.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a ladder with a rear guard according to the present invention will be described below with reference to FIGS. 1 to 3. First, FIG. 1 shows a ladder with a rear guard as an example to which the present invention is applied, and (a) is a vertical cross-sectional view of a vertical shaft in a state in which the rear guard is lifted from a ladder main body to stand in use, (B) is a vertical cross-sectional view of the vertical shaft in a state in which the rear guard is folded along the main body of the ladder when not in use and is lying flat. In the figure, 1 is a ladder with a rear guard,
2 is a ladder body, 2a is a pillar, 2b is a step, 3 is a rear guard, 4 is a connecting rod, 5 is a bracket, 6 is a wire,
7 is a balance weight, 8 is a rotary pulley, 9 is a shaft,
9a is an inner wall, and 9b is an opening.

As shown in the figure, the ladder 1 with rear guard is laid vertically from the opening 9b of the vertical shaft 9 into the vertical shaft 9 along the inner wall 9a, and the ladder main body 2 and the rear guard 3 are provided.
, A connecting rod 4, a bracket 5, and a manual auxiliary portion (a wire 6, a balance weight 7 and a rotary pulley 8). Each part of the constituent members of the ladder 1 with the rear guard shown in FIGS. 1A and 1B will be described below.

The ladder main body 2 includes columns 2a and 2 arranged in parallel.
a is fixed so as to sandwich both ends of the steps 2b, ... For allowing the operator to place his / her feet at predetermined intervals at the same position.
It is designed such that each foot is stepped on the ... and moved up and down along the inner wall 9a of the vertical shaft 9. The rear guard 3 is a rectangular frame in plan view which is attached to the columns 2a, 2a on both sides of the ladder main body 2 at a predetermined interval and is rotatable along the ladder main body 2 by 90 degrees from below in the vertical direction. In a state where the ladder body 2 is vertically hung up and stands up, it serves to protect an operator who moves the ladder body 2 up and down.
On the other hand, when folded along the ladder main body 2 and lying down, it does not interfere with the loading of, for example, excavating machinery into the vertical shaft 9.

The connecting rod 4 is a member in which all stages of rear guards 3, ... Attached to the columns 2a, 2a on both sides of the ladder body 2 at predetermined intervals are connected to each other. When a vertical force is applied to, the rear guards 3, ... Of all stages can be simultaneously moved in the vertical direction according to the movement of the connecting rod 4, and any rear guard 3
Even if a vertical force is applied to, the connecting rod 4 transmits the force to the other rear guards 3, ..., And the rear guards 3 ,. . The bracket 5 has one end connected to the back of the ladder main body 2 at several places and the other end attached to the inner wall 9a of the vertical shaft 9, and fixes the ladder main body 2 along the inner wall 9a of the vertical shaft 9. It is like this.

Further, the wire 6, the balance weight 7 and the rotary pulley 8 which are the manual auxiliary parts of the ladder 1 with the rear guard will be described. The wire 6 has one end connected to the upper end of the connecting rod 4 and the other end connected to a balance weight 7 arranged below the ladder main body 2, the central part thereof being hung on the rotary pulley 8 and the rotary pulley 8. It is movable forward and backward by rotation, and is delivered by rotating the rotary pulley 8.

The balance weight 7 is a heavy object which is connected to one end of the wire 6 and is disposed below the ladder main body 2. The balance weight 7 is a rear guard when the rear guards 3 ,. The manual operation force required for the ups and downs of the attached ladder 1 is reduced by its weight. The rotary pulley 8 is a disc-shaped member that is installed at the upper end of the ladder main body 2 and is rotatably supported around a central axis (not shown). In order to send out the wire 6 in a state where the wire 6 is hung on (not shown), an operator manually rotates the wire 6 around its central axis.

As a result, the rear guards 3, 3, ...
At the time of probing, the operator manually selects the specific rear guard 3
Alternatively, when the connecting rod 4 is moved upward, the rear guards 3, ... Of all stages connected by the connecting rod 4 and reduced by the balance weight 7 interlock with each other so that they can stand up from the ladder body 2. Has become. Further, when the rear guards 3, ... Of all the stages are erected, if the operator manually moves the specific rear guard 3 or the connecting rod 4 downward, the rear guards 3 ,. Then
It can be folded along the ladder body 2 and laid flat.

Next, with reference to FIG. 2 and FIG. 3, the connecting portion of the constituent members of the ladder 1 with the rear guard will be described in detail. FIG. 2 shows a ladder main body, a rear guard, and a connecting portion of a connecting rod that connects the rear guard and the rear guard in the ladder with the rear guard of FIG. 1, and (a) is an enlarged view of FIG.
1B is an enlarged view of FIG. 1B, in which 11 is a mounting hole,
Reference numeral 12 is a shaft hole, and 13 is a communication hole.

As shown in the figure, the support 2a has mounting holes 11, ... For the bracket 5 and a shaft hole 1 for the rear guard 3.
2, ... are formed. Further, the connecting rod 4 is formed with communication holes 13, ... For the rear guard 3.

The mounting holes 11 are formed at predetermined intervals on the support column 2a and are used for mounting the bracket 5. By attaching the bracket 5 having one end fixed to the inner wall 9a of the vertical shaft 9 to the mounting hole 11, the ladder body 2 can be fixed along the inner wall 9a of the vertical shaft 9.

The shaft holes 12 are formed in the support columns 2a at predetermined intervals and are used for mounting the rear guard 3. With both ends of the rear guard 3 inserted and mounted in the shaft hole 12, by applying a vertical force from the outside to the rear guard 3, the rear guard 3 will move around the hole and the ladder main body 2 It is possible to rotate by 90 degrees from below vertically.

The communication holes 13 are formed in the connecting rod 4 at predetermined intervals and are used for attaching the rear guard 3.
When a vertical force is applied to the specific rear guard 3 or the connecting rod 4 from the outside with the central portions of the rear guards 3 inserted and attached in the communication holes 13, the rear guards 3 around the communication holes 13 are applied. Is rotated so that the rear guards 3 ... of all stages can be interlocked at the same time.

FIG. 3 is an enlarged view from the front of the ladder with rear guard shown in FIG. 1 in a state where all the rear guards are erected. In the figure, 14 is a vertical joint hole. Connecting rod 4
As shown in the drawing, the upper and lower connecting holes 1 and
4, 14 are formed.

Thus, the upper and lower connecting holes 14 formed in the connecting rod 4 and the upper and lower connecting holes 14 formed in the separate connecting rods 4 are engaged with each other by using a connecting pipe (not shown), By inserting bolts (not shown) into the holes 14 and 14, the connecting rods 4 and 4 are fixed to each other. Further, according to the length of the ladder body 2, many connecting rods 4, ... Can be spliced together.

Since the ladder 1 with the rear guard is constructed as described above, the following effects can be obtained.

During use, an operator simultaneously erects all the rear guards 3, ... From the ladder main body 2 and protects the rear guards 3 ,. , And when not in use, the rear guards 3, ... Of all stages can be laid flat against the ladder body 2 at the same time so that machinery and the like can be easily carried into the shaft 9. In addition, since the manual auxiliary portion composed of the wire 6, the balance weight 7 and the rotary pulley 8 is used, the operating force is reduced and the operator can easily lift all the rear guards 3, ... It can be erected from the ladder body 2 or folded and laid flat.

In the example of the above embodiment,
By applying the above manual auxiliary section as a manual auxiliary means,
The rear guards 3, ... Of all stages on the ladder body 2 are manually undulated, but this is of course not the only case, and for example, a simple wire 6 can be manually attached to the opening 9a of the vertical shaft 9. A winding device may be installed to wind the wire 6 connected to the uppermost rear guard 3.

[0027]

As described above, according to the ladder with rear guard according to the invention described in claim 1, when using, the rear guards of all stages are erected from the ladder main body to protect the operator, and the ladder guard is not used. Sometimes, the rear guards of all stages can be folded along the ladder body and laid flat in order to bring machinery and the like into the shaft.

According to the second aspect of the invention, in the ladder with the rear guard according to the first aspect, the manual assisting means is further used, so that the rear guards of all stages can be easily moved up and down. it can.

[Brief description of drawings]

FIG. 1 shows a ladder with a rear guard as an example to which the present invention is applied, in which (a) is a vertical cross-sectional view of a vertical shaft in a state where the rear guard is lifted from a ladder main body to stand up when used ( b) is a vertical cross-sectional view of the vertical shaft in a state in which the rear guard is folded along the ladder body and flattened when not in use.

FIG. 2 shows a ladder body with a rear guard shown in FIG. 1, showing a connecting portion of a ladder body, a rear guard, and a connecting rod of the rear guard, and (a) is an enlarged view of FIG. 1 (a),
1B is an enlarged view of FIG. 1B.

FIG. 3 is an enlarged view from the front of the ladder with rear guard of FIG. 1 in a state in which the rear guards of all stages are erected.

FIG. 4 shows a conventional ladder with a rear guard, in which (a) is a side view and (b) is a front view.

[Explanation of symbols]

 1 Ladder with rear guard 2 Ladder body 3 Rear guard 4 Connecting rod 6 Wire 7 Balance weight 8 Rotating pulley 9 Vertical shaft

Claims (2)

[Claims] 1. A ladder main body that is laid vertically along a wall surface of a vertical shaft, and is connected to both sides of the ladder main body at predetermined intervals.
It is equipped with multiple stages of rear guards each capable of undulating, and a connecting rod that connects the rear guards of all stages, and the rear guards of all stages are manually foldable with respect to the ladder body. A ladder with a rear guard. 2. A ladder with a rear guard according to claim 1, further comprising a manual assisting means for reducing a manual operation force required for raising and lowering the rear guards in all stages.