JP2001107389A - Hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize the minimum rotation radius of an upper structure and install a roof on the minimum space smoothly by enlarging the maximum erecting angle of a boom without reducing the function of handrails. SOLUTION: A driver's seat 4 is provided on the upper face of a shovel body 3, front roof supports 15, 15, also functioned as vertical handrails are arranged in the frontward of the driver's seat 4 and rearward of a boom 8 constituting a work attachment 7 in such a state as not interfered with the front roof supports 15, 15 in all boom hoisting range through the whole swing operation range of the boom 8, and a roof covering the driver's seat from the upward is provided in the upper part of the both side front roof supports 15, 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small hydraulic excavator in which a driver's seat is provided on an upper surface of a shovel body and a work attachment is provided in front of the driver's seat.

[0002]

2. Description of the Related Art Conventionally, in a small excavator called a mini excavator, as shown in FIGS. 4 and 5, an upper revolving unit 2 is mounted on a crawler type traveling unit 1 so as to be pivotable about a vertical axis. Thus, a shovel body (base machine) 3 is configured.

The excavator body 3 is provided with a driver's seat 4 at the center of the upper surface of the upper revolving unit 2, an engine and other machinery (not shown) below the driver's seat 4, and lever-type operation on both left and right sides. Devices 5, 5 are provided.

A handrail 6 is attached to the upper revolving unit 2 in front of the driver's seat 4, and a work attachment 7 is mounted immediately in front of the handrail 6.

The work attachment 7 includes a boom 8 which can be raised and lowered. In a standard specification (excavation specification), an arm 9 is attached to a tip of the boom 8 and a bucket 10 is attached to the tip of the arm 9. Reference numeral 11 denotes a boom raising / lowering cylinder for raising / lowering the boom 8, 12 denotes an arm cylinder for operating the arm 9, and 13 denotes a bucket cylinder for operating the bucket 10.

[0006] The boom 8 is mounted so as to be swingable in the left-right direction about the longitudinal axis so that the trenching work can be easily performed.
Driven by the swing cylinder 14.

[0007]

The handrail 6 is formed in an inverted U shape in which a horizontal rail 6b is horizontally mounted between upper ends of vertical rails 6a, 6a on both left and right sides, and a driver leans forward. It is used as a handrail to support the body by hand when checking the excavated part or when getting on and off.

However, according to this type of conventional hydraulic excavator, the horizontal rail 6b of the handrail 6 interferes with the boom 8 in the upright state of the boom 8 as shown by a two-dot chain line in FIG. Is limited to an angle that the shovel originally has (hereinafter, referred to as a specification angle), which causes a problem that the minimum turning radius R1 of the upper structure including the work attachment 7 is increased.

It is conceivable that the overall height of the handrail 6 is set low so as not to interfere with the boom 8. However, in this case, the vertical rails 6a, 6a, which are frequently used, are lowered, so that the original handrail can be used. The function is significantly reduced.

On the other hand, small shovels of this type usually include
Although a roof is not provided, it goes without saying that it is desirable to install a roof from the viewpoint of ensuring safety at the construction site.

However, in this case, since there is no room in front of the driver's seat, the vertical rail 6
A and 6a hindered the erecting of a roof support in front of the driver's seat, which was one of the obstacles in installing the roof.

Therefore, the present invention can reduce the minimum turning radius of the upper structure by increasing the maximum upright angle of the boom without deteriorating the handrail function, and moreover, install the roof in a minimum space without difficulty. It is intended to provide a hydraulic excavator capable of performing such operations.

[0013]

According to a first aspect of the present invention, a driver's seat is provided on an upper surface of a shovel body provided with a traveling body, and the shovel body swings up and down and swings left and right around a vertical axis at a front portion of the shovel body. A hydraulic excavator comprising a work attachment with an actuable boom,
On the upper surface of the shovel body, in front of the driver's seat and on both left and right sides behind the boom, a roof support that also serves as a vertical handrail is erected, and a roof that covers the driver's seat from above is provided above the both-side roof support. The boom is arranged so as not to interfere with the roof supports on both sides in the entire undulation operation range throughout the swing operation range, and to protrude rearward from the roof supports on both sides in the maximum standing state.

According to a second aspect of the present invention, in the configuration of the first aspect, a connecting bar serving also as a horizontal handrail is provided between both side roof supports,
It is provided in an arrangement that does not interfere with the boom.

As described above, since the both sides of the roof support column on which the roof is mounted are also used as vertical handrails and are arranged so as not to interfere with the boom in the entire undulation range through the entire swing operation range of the boom. The maximum standing angle of the roof is expanded to the specified angle (a state protruding backward from both sides of the roof support) to reduce the minimum turning radius of the upper structure, secure the necessary handrail function, and minimize the roof space. Can be installed without difficulty.

According to the second aspect of the present invention, since the connecting bar serving as a horizontal handrail is provided between the roof supports on both sides so as not to interfere with the boom, both the handrail function and the strength of the roof support can be enhanced. .

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

Only the differences from the conventional hydraulic excavator shown in FIGS. 4 and 5 will be described.

Left and right front roof posts 15, 15 which also serve as vertical handrails on the front left and right sides of the driver's seat 4 in the upper revolving structure 2 of the excavator body 3, right and left rear roof posts 16, on the rear left and right sides of the driver's seat 4. A roof 17 is provided, each standing upright, covering the driver's seat 4 from above to protect the driver from falling objects and the like.
Are mounted over the upper ends of the columns 15, 15, 16, 16.

Boom 8 constituting work attachment 7
Swings right and left at the front center of the upper swing body 2. Here, the both-side roof supports 15, 15 are boom 8
In any swing position, the arm is mounted so as not to interfere with the boom 8 in the entire undulating operation range.

A connecting bar 18 also serving as a horizontal handrail is horizontally mounted between the front roof supports 15 on both sides, and the front excavation portion is viewed by the front roof supports 15 on both sides and the connecting bar 18. A handrail which is a handrail at the time of getting in and getting on and off is configured.

The connecting bar 18 is mounted at a height position (a position near the middle lower portion) where the connecting bar 18 does not interfere with the boom 8 in the entire swing range and the entire up-and-down operating range of the boom 8.

According to this shovel configuration, the boom 8 is connected to the handrail (the front roof supports 15, 15 and the connecting bar 1).
8), the maximum turning radius R2 of the upper structure including the work attachment 7 in order to stand up to the specification angle at which it protrudes rearward (to the driver's seat 4 side) from the roof supports 15, 15 on both sides without interfering with the upper surface. Is smaller than the minimum turning radius R1 of the conventional shovel shown in FIGS.

In addition, the front roof supports 15, 15 can be used also as vertical railings, which are particularly necessary at the time of work, getting on and off, and the like. There is no possibility that the sliding function is reduced. Also,
Since it is not necessary to secure separate spaces for the roof support and the vertical railing, both can be easily installed with a minimum space.

Further, since the connecting bar 18 which also serves as a horizontal handrail is provided between the roof supports 15 on both sides so as not to interfere with the boom 8, the handrail function can be strengthened.
The strength of the roof posts 15, 15 can be increased.

Incidentally, in order to enhance the handrail function and to increase the strength of the front roof pillars 15, it is desirable to provide a connecting bar 18 between the two pillars 15, 15 as in the above embodiment. 18 may be provided as needed.

In addition to the roof supports 15 on both sides,
It goes without saying that the present invention also falls within the scope of the present invention when a handrail is attached separately to such an extent that the desired function of the present invention is not impaired.

[0028]

As described above, according to the present invention, both roof supports on which the roof is mounted are also used as vertical handrails,
In addition, the boom is positioned so that it does not interfere with the boom throughout the entire swing operation range throughout the entire swing operation range. The minimum turning radius of the superstructure can be reduced, the necessary handrail function can be secured, and the roof can be installed comfortably in the minimum space.

According to the second aspect of the present invention, since the connecting bar serving as a horizontal handrail is provided between the both-side roof supports so as not to interfere with the boom, both the handrail function and the roof support strength can be enhanced. .

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic shovel according to an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a side view of a conventional hydraulic excavator.

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 Reference Signs List 3 excavator main body 1 excavator main body traveling body 2 excavator main body revolving superstructure 4 driver's seat 7 work attachment 8 boom 15, 15 front roof support that also serves as vertical railing 17 roof 18 connecting bar

Claims (2)

[Claims] An excavator body provided with a traveling body is provided with a driver's seat on an upper surface thereof, and a work attachment having a boom capable of swinging up and down and swinging right and left around a vertical axis is attached to a front portion of the excavator body. In the hydraulic excavator thus formed, in front of the driver's seat on the upper surface of the excavator body and on both left and right sides behind the boom,
A roof support that also serves as a vertical handrail is erected, and a roof that covers the driver's seat from above is provided above the roof supports on both sides. A hydraulic excavator, wherein the excavator is disposed so as to protrude rearward from the roof supports on both sides in a maximum standing state. 2. The hydraulic excavator according to claim 1,
A hydraulic excavator, wherein a connecting bar serving also as a horizontal handrail is provided between both roof supports so as not to interfere with the boom.