JP3138229B2 - Tracked construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracked construction machine such as a hydraulic shovel and a hydraulic crane, and more particularly to a tracked construction machine provided with a handle for an operator who gets on and off a cab.

[0002]

2. Description of the Related Art In general, tracked construction machines such as hydraulic shovels and hydraulic cranes are provided with handles for securing safety during getting on and off by gripping when an operator gets on and off the cab. ing.

FIGS. 3 and 4 show a hydraulic shovel as an example of a construction machine equipped with a handle of this type according to the prior art.

In FIG. 3, reference numeral 1 denotes a hydraulic excavator,
The hydraulic excavator 1 includes a lower traveling body 2 provided with crawler tracks 2A on both left and right sides (only one is shown), an upper revolving body 3 rotatably mounted on the lower traveling body 2, and a The work device 4 is provided at the front part so as to be capable of raising and lowering, and performs excavation work such as earth and sand.

[0005] The upper revolving unit 3 is surrounded by a revolving frame 5 provided on the lower traveling unit 2 via a revolving device and a building cover located at the rear of the revolving frame 5. From a machine room 6 that accommodates the like and the like, an operator's cab 7 provided on the turning frame 5 at the front side of the machine room 6, and a counterweight (not shown) provided at the rear of the turning frame 5. It is configured.

The driver's cab 7 is mounted on the front left side of the turning frame 5, and the driver's cab 7 is formed from a steel plate or the like into a box shape having front and rear surfaces, left and right surfaces, a ceiling surface, and the like. A driver's seat for the operator to sit down, various operation levers,
An operation panel and the like are provided. A door 8 that opens and closes when an operator gets on and off the vehicle is provided on the left outer side of the cab 7.
In addition, a handrail 9 is provided at a corner on the left front side and extended in the vertical direction so as to be gripped when the operator gets on and off the operator's cab 7.

Here, the cab 7 including the outside of the handrail 9 is provided.
The turning radius A of the driver's cab 7 is defined by the handrail 9 when the upper turning body 3 turns on the lower traveling body 2.

[0008] Reference numeral 10 denotes a handle for raising and lowering provided on the revolving frame 5 located below the operator's cab 7.
As shown in FIG. 4, 0 is formed of a steel bar bent substantially in an L shape. Here, this lifting handle 1
Numeral 0 has a grip portion 10A which is fixed to the outer surface of the D-shaped frame 5A constituting the revolving frame 5 by welding or the like and extends obliquely downward.

The elevating handle 10 is disposed, for example, at a height of about 1600 mm above the ground, and is secured when the operator gets into the operator's cab 7 to secure safety when getting on and off. is there.

[0010]

However, in the above-described lifting handle 10 according to the prior art, the distance B between the lower end of the grip 10A and the upper surface of the crawler belt 2A is equal to the distance B between the lower surface of the revolving frame 5 and the upper surface of the crawler belt 2A. Is smaller than the interval C (B <C), and the grip 10A extends to a position close to the upper surface of the crawler belt 2A.

As described above, the grip portion 10 of the lifting handle 10
If A extends close to the upper surface of the crawler belt 2A, for example, when the hydraulic excavator 1 travels on muddy ground, mud or the like attached to the crawler belt 2A adheres to the grip portion 10A of the lifting handle 10. There is a problem that it is accumulated, and the operator cannot reliably grip the gripping portion 10A.

Further, for example, when a hydraulic excavator travels on muddy ground in a cold region, frozen soil adhering to the crawler belt 2A collides with the gripping portion 10A of the lifting handle 10 or the like, and the lifting handle 10 is bent or damaged. Or have a problem. When the frozen soil adhering to the lifting handle 10 as described above accumulates between the outer surface of the D-shaped frame 5A, the lifting handle 1
A problem arises in that the connection between the 0 and the D-type frame 5A is damaged, and the lifting handle 10 comes off.

Further, since the grip 10A of the lifting handle 10 projects outward from the outside of the handrail 9 attached to the driver's cab 7 by a projection length D, the entire width of the upper revolving unit 3 is increased. Increases by the protruding length D. As a result, the turning radius A of the cab 7 during the turning operation of the upper turning body 3 is substantially increased by the protrusion length D,
There is a problem that workability in a small work site is impaired.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to prevent mud from adhering to a handle when traveling on muddy ground or the like, and to provide an upper portion by the amount provided with the handle. It is an object of the present invention to provide a tracked construction machine capable of preventing an entire width of a revolving superstructure from increasing.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a lower traveling body having crawler tracks on both left and right sides, a cab mounted on the lower traveling body so as to be pivotable, and a cab mounted on a turning frame. A revolving superstructure provided with a handle , a handle positioned below the driver's cab and protruding from an outer surface of a revolving frame of the upper revolving structure, and a vertical position positioned on the outer surface of the driver's cab
This is applied to a track-type construction machine consisting of a handrail that protrudes and extends .

A feature of the structure adopted in the first aspect of the present invention is that the handle is separated in the front-rear direction and the turning frame is separated.
At least two anchors secured to the outer surface of the arm;
Formed in a U-shape from the gripping part connecting these fixed parts
The handle is provided so that each fixing portion is formed on an outer surface of the revolving frame.
From provided to protrude obliquely downward, and the handle has a lower end portion of the grip portion so as not to protrude from the lower surface of the revolving frame and the track upper surface and spacing the above distance between the track upper surface and the rotating frame lower surface of While setting the size ,
The grip is retracted closer to the cab than outside the handrail
The configuration is such that the projection length is set .

According to the above configuration, the outside of the turning frame is provided.
The handle provided to project diagonally downward from the surface
At least two anchors secured to the outer surface of the arm;
Formed in a U-shape from the gripping part connecting these fixed parts
can do. Then, the grip portion of the handle does not protrude below the lower surface of the revolving frame, and a large gap can be maintained between the lower end of the grip portion and the crawler belt of the lower traveling body. At this time, it is possible to prevent mud, frozen soil and the like adhering to the crawler belt from adhering to the grip portion of the handle.

[0018]

In addition to preventing the grip portion of the handle from protruding below the lower surface of the revolving frame and approaching the crawler belt of the lower traveling body, the grip portion of the handle is provided on the outer surface of the cab. By pulling it into the cab side rather than the handrail, it is possible to prevent the total width of the upper revolving structure from increasing by the amount provided with the handle, and the turning radius of the cab is substantially reduced during the revolving operation of the upper revolving structure. Can be prevented from increasing.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 11 denotes a hydraulic shovel as a tracked construction machine having a handle according to the present embodiment,
The excavator 11 is a conventional excavator 1.
Similarly to the above, a lower traveling body 2 provided with crawler belts 2A on the left and right sides, an upper revolving body 3 rotatably mounted on the lower traveling body 2, and a vertically movable upper part of the upper revolving body 3 Although it is provided with a working device 4 for performing excavation work such as earth and sand, the configuration of a later-described lifting handle 12 provided on a revolving frame 5 of the upper revolving unit 3 is different from that of the prior art.

Reference numeral 12 denotes a lifting handle applied to the present embodiment in place of the lifting handle 10 according to the prior art. The lifting handle 12 is operated by an operator in substantially the same manner as the lifting handle 10 according to the prior art. In order to ensure safety when getting on and off the cabin 7, the turning frame 5 is positioned below the cab 7
Is provided on the outer surface.

The lifting handle 12 is made of a steel bar bent in a substantially U-shape.
Are fixed to the outer surface of the D-shaped frame 5A by welding or the like, and are separated from each other in the front-rear direction.
2A and 12A, and a grip portion 12B which connects the fixing portions 12A and faces the outer surface of the revolving frame 5 with a gap.

Then, as shown in FIG.
The distance B 'between the lower end of the gripper 12B and the upper surface of the crawler belt 2A is set to be equal to or greater than the distance C between the lower surface of the revolving frame 5 and the upper surface of the crawler belt 2A (B'≥C). This prevents the grip portion 12B from protruding downward from the lower surface of the revolving frame 5, and the lifting handle 12 and the lower traveling body 2
A large space can be maintained between the crawler belt 2A and the upper surface of the crawler belt 2A.

The protruding length of the lifting handle 12 in the width direction is such that the outside of the grip portion 12B is drawn into the operation cab 7 by a smaller dimension E than the outside of the handrail 9 provided in the operation cab 7. As a result, the grip portion 12B is configured to fit within the turning radius A of the cab 7 including the handrail 9.

The elevating handle 12 according to the present embodiment has the above-described configuration, and can be secured when the operator gets on and off the operator's cab 7 to secure the safety at the time of getting on and off. There is no particular difference from the one.

According to the present embodiment, the distance B 'between the lower end of the grip 12B of the lifting handle 12 and the upper surface of the crawler belt 2A is equal to or greater than the distance C between the lower surface of the revolving frame 5 and the upper surface of the crawler belt 2A. By setting B ′ ≧ C), a large distance can be maintained between the grip portion 12B and the upper surface of the crawler belt 2A of the lower traveling body 2.

As a result, for example, when traveling on muddy ground, etc., the mud adhering to the crawler belt 2A of the lower traveling body 2 is removed by the gripper 1
2B can be effectively prevented. As a result, the operator can securely grip the grip portion 12B of the raising / lowering handle 12 and can get on and off the operator cab 7 quickly and safely.

Further, even when frozen soil adheres to the crawler belt 2A when traveling on muddy ground in a cold region, it is possible to avoid the collision of the frozen soil with the grip portion 12B of the raising / lowering handle 12 and the like. Damage can be prevented.

Further, the protruding length of the raising / lowering handle 12 in the width direction is set such that the side end of the grip portion 12B is drawn into the driver's cab 7 by a dimension E from the outside of the handrail 9 provided in the driver's cab 7. The upper revolving unit 3 including the handrail 9 is set and the gripper 12B is set.
The entire width of the upper swing body 3 can be prevented from increasing by the amount provided with the lifting handle 12.
Thereby, the driver's cab 7 can be accommodated within the prescribed turning radius A during the turning operation of the upper turning body 3, and for example, good workability in a small work site can be maintained.

Further, two fixing portions 12A of the lifting handle 12 are provided in the front and rear direction at a distance from each other, and the fixing portions 12A are fixed to the outer surface of the revolving frame 5, respectively. The mounting strength to the revolving frame 5 is improved as compared with the handle 10 for lifting,
2 can be more reliably prevented.

In the above embodiment, the turning frame 5
A pair of fixing portions 12A respectively fixed to the outer side surfaces of
The U-shaped lifting handle 12 composed of the gripping portions 12B connecting the fixing portions 12A has been described as an example. However, the present invention is not limited to this. For example, an L-shaped lifting handle may be used. And the grip portion of the lifting handle may be fixed to the outer surface of the revolving frame 5 so as to extend in the front-rear direction.

In the above embodiment, a hydraulic shovel is taken as an example of a tracked construction machine. However, the present invention is not limited to this, and may be applied to another tracked construction machine such as a hydraulic crane. Can be.

[0034]

As described above in detail, according to the first aspect of the present invention, the handle provided below the driver's cab and provided on the outer side surface of the revolving frame is separated from the revolving frame in the front-rear direction.
At least two fixing portions fixed to the outer surface;
From the holding part that connects the fixed parts of the
The handle may be configured such that each fixing portion is inclined from the outer surface of the turning frame.
The handle is provided so as to protrude downward, and the handle is arranged so as not to protrude from the lower surface of the revolving frame. Set the size above
Projection length of the gripping part to be drawn into the cab side than the outside of the handrail
With this configuration, the grip portion can be prevented from protruding downward from the lower surface of the revolving frame, and a large gap can be maintained between the grip portion and the crawler belt upper surface. Thereby, it is possible to prevent the mud attached to the crawler belt from adhering to the grip portion when traveling on muddy ground, for example, and the operator getting on and off the driver's cab can reliably grip the grip portion of the handle.
Further, even if frozen soil adheres to the crawler belt in a cold region or the like, it is possible to prevent the frozen soil from colliding with the grip portion of the handle or the like, thereby preventing breakage or damage of the handle.

The handle is separated in the front-rear direction and
At least two fixed to the outer surface of the revolving frame
The fixed part and the grip part connecting these fixed parts
Because it is formed in the shape of a letter, the handle to the revolving frame
The mounting strength can be improved, and the handle is more reliably prevented from being damaged
it can. In addition, since the protrusion length of the handle is set so that the grip portion is drawn into the driver's cab side from the outside of the handrail protruding from the driver's cab, the entire width of the upper revolving structure is reduced by the provision of the handle. It can be reliably prevented from increasing. As a result, the driver's cab can be kept within a specified turning radius during the turning operation of the upper turning body, and for example, good workability at a narrow work site can be maintained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a hydraulic excavator provided with a handle according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing the hydraulic shovel in FIG. 1 in a state where a working device is removed.

FIG. 3 is a partially broken external view showing a hydraulic excavator provided with a handle according to the related art.

FIG. 4 is a partially broken front view showing the hydraulic excavator in FIG. 3 with a working device removed.

[Explanation of symbols]

 2 Lower traveling structure 2A Crawler belt 3 Upper revolving structure 5 Revolving frame 7 Driver's cab 9 Handrail 12 Lifting handle 12A Fixed part 12B Gripping part

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B66C 13 / 52,15 / 00 B60R 3/00-3/04

Claims (1)

(57) [Claims] An undercarriage having crawler tracks on both left and right sides;
An upper revolving structure that is pivotably mounted on the lower traveling structure and has an operator cab on a revolving frame, and a handle located below the driver's cab and protruding from an outer surface of the revolving frame of the upper revolving structure. Extending vertically in a position on the outer surface of the cab.
In the tracked construction machine including a long and protruding handrail , the handle is separated from the front and rear of the revolving frame in the front-rear direction.
At least two fixing portions fixed to the side surfaces;
The handle is formed in a U-shape from a grip portion that connects between the fixed portions, and the handle is configured such that each fixed portion is formed from an outer surface of the turning frame.
The handle is provided so as to protrude obliquely downward, and the distance between the lower end of the grip portion and the upper surface of the crawler belt is larger than the distance between the lower surface of the swivel frame and the upper surface of the crawler belt so as not to protrude from the lower surface of the rotary frame. Sa
And the grip portion is located outside the handrail.
A tracked construction machine characterized in that the length is set to a protruding length to be drawn into the cab side .