JPH10237900A - Construction machine having ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs by reducing the number of ladders to one in a large construction machine and enhance safety and operability when ascending or descending a cab and a cab bed. SOLUTION: A catwalk 6 leading to a cab bed 4 is mounted on the side face of the lower part of an upper structure 3. A guide frame 12 for a ladder 11 is provided on the side face of the upper structure 3 from the catwalk 6 to the part of the upper surface 3a of the upper structure 3 leading to a cab entrance. The ladder 11 that freely rises and falls along the guide frame 12 is installed. When lowered the ladder 11 communicates the ground to the catwalk 6, and when raised communicates the catwalk 6 to the upper surface 3a of the upper structure 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine having a ladder for ascending and descending to an upper revolving structure or a cab installed on a lower traveling structure, and particularly to a large construction machine such as a hydraulic shovel or a loader shovel. The present invention relates to a construction machine having a ladder mounting structure suitable for a construction machine.

[0002]

2. Description of the Related Art FIGS. 4A and 4B are a plan view and a side view showing an example of a conventional large construction machine such as a hydraulic shovel or a loader shovel, omitting an articulated arm or a shovel. FIG. 5 is an enlarged plan view of a main part of FIG.

In FIGS. 4 (A) and 4 (B), an upper revolving unit 3 is mounted on a lower traveling unit 1 having a footwear 1a via a revolving unit 2 so as to be revolvable. On one side of the front part of the upper revolving unit 3, a cab bed 4 in which machinery such as hydraulic equipment and electric components are stored is installed.
The cab 5 is provided on the upper part of the cab. A catwalk 6 is provided at a lower portion of the upper revolving unit 3 along a side surface on which the cab bed 4 is installed, as a passage for an operator such as an operator or a maintenance inspector to walk.

A first ladder 7 is attached to the middle of the catwalk 6 so as to project outward and incline at right angles to the catwalk 6. The ladder 7
Is movable in the vertical direction along the guide frame 7a. A second ladder 8 is provided between the catwalk 6 and the cab 5 so that an operator or the like can climb on the upper surface of the cab 5 or the upper swing body 3. The second ladder-8
5 is disposed on one side in the width direction of the catwalk 6 as shown in FIG. 5, and the other side in the width direction is a passage 9 for going to the cab bed 4. Reference numeral 10 denotes a door provided on the cab bed 4.

In the conventional construction machine constructed as described above, when an operator gets on the cab 5, the first ladder 7 is lowered along the guide frame 7a to bring the lower end close to the ground. The worker goes up to the catwalk 6 by the first ladder 7 and gets into the cab 5 by the second ladder 8 therefrom. When the operator inspects the equipment in the cab bed 4, the worker climbs up to the catwalk 6 by the first ladder 7 and then reaches the cab bed 4 through the cab bed passage 9 and the door 10 And enter the cab bed 4. During operation of the construction machine, as shown in FIG. 4B, the first ladder 7 is moved to the upper part of the lower traveling body 1 in order to prevent the rudder 7 from colliding with the lower traveling body 1 by turning. Position.

[0006]

According to the construction machine having the conventional ladder constructed as described above, the second ladder 8 and the cab bed passage 9 are formed in the width direction of the catwalk 6. Because they are arranged in parallel, the second ladder-8
In addition, the width of the cabbed passage 9 is reduced. As described above, since the width of the second ladder 8 is narrow, it is difficult for the worker to get up and down when getting on and off the cab 5, and there is a problem in terms of safety. In addition, since the width of the passage 9 is narrow, In addition, there is a problem that when inspecting the equipment in the cab bed 4, it is difficult to pass through the passage 9 and workability is poor.

Conventionally, first and second two ladders 7 are used.
8 is provided, but the first ladder 7 has no function in the raised state.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a large construction machine, it is possible to reduce the cost by reducing the number of ladders to one, and to further reduce the width of the ladder and the passage to the cab bed. It is an object of the present invention to provide a construction machine having a ladder capable of increasing the width of the cab and improving the safety and workability when ascending and descending to and from a cab or a cab bed.

[0009]

According to the present invention, in order to achieve the above object, a cab is provided via a cab bed at a front portion of an upper revolving unit provided on a lower traveling unit, and the upper revolving unit is provided with a cab. In a construction machine comprising a catwalk connected to the cab bed on a lower side surface, a ladder guide frame is provided on a side surface of the upper revolving unit from a position leading from the catwalk to a cab entrance on an upper surface of the upper revolving unit. A ladder is mounted so as to be able to move up and down along the guide frame, and the ladder has a configuration in which the ladder communicates between the ground and the catwalk in the descending state, and communicates the catwalk and the upper surface of the upper revolving structure in the ascending state. I do.

In the present invention, when the worker gets into the cab, the ladder is lowered to allow communication between the ground and the catwalk, and after the worker rises on the catwalk by the ladder, the ladder is then moved to the ladder. Raise the-to make communication between the catwalk and the cab, and get into the cab by ladder. When the operator checks the equipment in the cab bed, he lowers the ladder, goes up on the catwalk, and enters the cab bed through the catwalk.
At this time, since the ladder is located between the catwalk and the ground, there is no problem even if the width of the ladder is widened without hindering the movement of the worker on the catwalk. As described above, according to the present invention, it is possible to both climb on the catwalk and get on the cab using one rudder, and furthermore, the width of the rudder is increased to increase the safety and ease of use when ascending and descending. Workability is improved without the ladder reducing the width of the path to the cab bed on the catwalk.

[0011]

1 and 2 show an embodiment of a construction machine having a ladder according to the present invention. FIG. 1 (A), (B)
2A and 2B are a plan view and a side view, respectively, showing a state in which the ladder 11 is down, and FIGS. 2A and 2B are a plan view and a side view, respectively, showing a state in which the ladder 11 is up. 3 (A) and 3 (B) are rear views showing a state where the rudder 11 is lowered and raised, respectively, and FIG. 3 (C) is a side view showing a mounting structure of the rudder 11 on the catwalk 6. FIG. 1 to 3,
Parts corresponding to those of the conventional example shown in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted.

1 to 3, a guide frame 1 comprising a pair of left and right frame members 12a and 12b is provided on the side of the upper revolving unit 3 on which the cab bed 4 and the cab 5 are arranged.
2 is an opening 1 whose lower part is provided on a catwalk 6.
3 and is attached to a portion of the upper surface 3a of the upper swing body 3 that communicates with the entrance of the cab 5. The ladder 11 is attached so as to be able to move up and down along the guide frame 12. The opening 13 has a size that allows a person to pass through, and a step 14 is provided behind the opening 13. On the upper surface of the guide frame 12, a step 15 is provided as a relay point for climbing to the upper surface 3a of the upper swing body 3. Ladder-11,
The guide frame 12 has handrails 11a and 12c, respectively. As shown in FIG. 3A, when the ladder 11 is lowered, a space 16 is formed between the frame members 12a and 12b for an operator to pass through. Also, when the ladder 11 is lowered to the lower limit, the lower end of the ladder 11 is near the ground and the upper end is as shown in FIG.
(A) is near the catwalk 6 as shown in FIG.
On the other hand, when ladder-11 is raised to the upper limit, ladder-1
The lower end of 1 is near catwalk 6 and
The upper end of 1 is near the upper surface 3a of the upper swing body 3.

The raising and lowering of the ladder 11 corresponds to the ladder 11
By supporting the ladder with a balancer with a built-in spring, which applies a spring force suspended on the weight of the ladder 11 to the ladder 11 as a lifting force, the ladder 11 can be easily moved up and down. When moving up and down, the motor can be downsized. Alternatively, a wire or the like connected to the ladder 11 may be wound around an elevating drum or the like, and the elevating drum may be rotated manually or by a motor to perform elevating. The ladder 11 is stopped from moving up and down with respect to the guide frame 12 by a stopper mechanism at an ascending position and a descending position, respectively.

In this embodiment, the worker is required to be in the state shown in FIG.
When the user gets into the cab 5 from the ground as shown in FIG.
1 and the operator moves the ladder as shown in FIG.
11 moves up to the position on the step 14 at the rear of the catwalk 6. Next, the ladder 11 is raised as shown in FIGS. 2 and 3 (B), and as shown in FIG.
The user climbs up on the step 15 on the upper surface 3a of the upper rotating body 3 and gets into the cab 5 through the upper surface 3a of the upper rotating body 3.

When an operator enters the cab bed 4,
As shown in FIG. 1B, after the ladder 11 is raised on the step 14 as described above, the ladder 11 is kept lowered, and the worker can move between the frame members 12a and 12b shown in FIG. The passenger enters the cab bed 4 through the catwalk 6 through the space 16.

According to this embodiment, the guide frame 12 is attached from the catwalk 6 to the upper surface of the upper revolving unit 3, and the ladder 11 for moving up and down the catwalk 6 along the guide frame 12 is provided at the upper end thereof. Is the upper revolving superstructure 3
The ladder 11 can be used both for raising and lowering to the catwalk 6 and for raising and lowering to the cab 5 by allowing the ladder 11 to freely move up and down to the vicinity of the upper surface 3a of the vehicle. And cost can be reduced. The width of the ladder 11 is changed to catwalk 6
Can be made as wide as the width of the upper and lower parts, so that the safety at the time of elevating and lowering is improved and the elevating and lowering becomes easy. Further, the passage to the cab bed 4 is not narrowed, and the workability can be improved.

[0017]

As described above, according to the construction machine of the present invention, a ladder guide frame is provided on the side surface of the upper revolving structure from the catwalk to the location leading to the cab entrance on the upper surface of the upper revolving structure. A ladder is attached so as to be able to move up and down along the guide frame.The ladder communicates between the ground and the catwalk in the descending state, and communicates between the catwalk and the upper surface of the upper revolving structure in the ascending state. The ladder that goes up and down for the walk and the cab can be shared by one ladder, and the cost can be reduced. Further, the width of the ladder can be increased, and the safety at the time of elevating can be improved. Further, since the passage leading to the cab bed is not narrowed by the ladder, the workability is improved.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a side view, respectively, showing an embodiment of a construction machine having a ladder according to the present invention.

FIGS. 2A and 2B show the construction machine of FIG. 1 in a state where a ladder is lifted, wherein FIG. 2A is a plan view and FIG.

FIGS. 3A and 3B are ladders of the embodiment of FIGS. 1 and 2;
2 is a rear view showing the mounting structure of the ladder in the lowered state and the raised state of the ladder, respectively, and FIG. 3C is a side view showing the mounting structure of the ladder in a catwalk.

4A and 4B show a configuration of an example of a conventional construction machine having a ladder, wherein FIG. 4A is a plan view and FIG. 4B is a side view.

FIG. 5 is an enlarged plan view of a main part of FIG. 4;

[Explanation of symbols]

1: Lower traveling structure, 2: Revolving device, 3: Upper revolving structure, 4:
Cab Bed, 5: Cab, 6: Catwalk, 1
1: ladder, 12: guide frame, 13: opening, 14, 1
5: Step platform

Claims (1)

[Claims] 1. A construction in which a cab is installed via a cab bed at a front portion of an upper revolving structure installed on a lower traveling structure, and a catwalk communicating with the cab bed is mounted on a lower side surface of the upper revolving structure. In the machine, a guide frame of a ladder is provided on a side surface of the upper revolving structure from a position from the catwalk to a cab entrance on an upper surface of the upper revolving structure, and a ladder is attached along the guide frame so as to be able to move up and down. A construction machine having a rudder, having a configuration in which the ground and the catwalk are communicated in the descending state, and the catwalk and the upper surface of the upper swing body are communicated in the ascending state.