JP2000213000A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine having a cab with a door construction which does not interfere with rear structures when the door width is widened in order to improve the visibility. SOLUTION: An upper slewing body 12 almost circular in shape is provided on a lower traveling body 11 in a freely slewing manner and, on this upper slewing body 12, a cab 13 having a door 23 freely movable in horizontal direction and a rear structure 15 provided lower than the cab 13 at the rear side of the cab 13 are installed. The door 23 of the cab 13 comprises a door lower portion 23a located at the lower side of the height of the rear structure 15 and a door upper portion 23b located at the upper side of the height of the rear structure 15 and moves along a curbed line toward the rear structure 15 when the door is opened. The door upper portion 23b has an enlarged visibility portion 27 protruded to the rear side of the door lower portion 23a, on the other hand, an interference preventing recessed portion 28 is provided in order to prevent the interference with the rear structure 15 at the rear side of the door lower portion 23a relative to the door upper portion 23b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine characterized by a cab door.

[0002]

2. Description of the Related Art A construction machine, particularly a machine called an in-vehicle turning hydraulic excavator, is often used in a narrow space due to its characteristics. Therefore, the cab door can be opened and closed even in a narrow space. Also, a sliding door disclosed in Japanese Utility Model Laid-Open No. 6-12556, or a Japanese Utility Model Application Laid-Open No. 6-3406, so as not to go out of the turning radius of the body when the door is opened.
The lever-type door disclosed in Japanese Patent Publication No. 1 is adopted.

As shown in FIG. 5, the sliding type door has a cab 2 mounted on a swivel base 1 formed in a convex arc shape including a door 3 on a side surface thereof. Upper and lower rails 5 are respectively provided at the upper and lower portions of the opened elevator 4, a center rail 6 is provided at the center of the rear outer surface of the cab 2, and the door 3 side is always engaged with each of the rails 5, 6. The upper and lower rollers 7 and the center roller 8 are provided so that the door 3 can be freely opened and closed by sliding, and the position of the door 3 at the time of unlocking is provided within the turning radius of the turntable 1 along the outer surface of the cab 2. It is.

In the lever type door, as shown in FIG. 6, the side of the cab 2 mounted on the swivel base 1 is formed into a convex arc including the door 3, and the side of the cab 2 is formed on the side of the cab 2. Inside each of the upper and lower portions of the opened elevator 4
The base ends of the front lever 9a and the rear lever 9b having different lengths are pivotally supported at a predetermined distance between the fulcrums, and the pivot positions and the lengths of the two levers 9a and 9b are in plan view. The upper and lower sides are set so as to coincide with each other, and the front ends of the front lever 9a and the rear lever 9b are pivotally supported on the inner surface of the front part of the door 3 so as to be rotatable.

[0005]

As described in each of the above publications, such a conventional sliding door or lever type door has a vertical column located at the rear end of the door, which is provided with a device such as a lock striker. It stands almost vertically except.

For this reason, when the width of the door is increased in order to improve the visibility on the side surface of the cab, the sliding door shown in FIG. 5 or the lever type door shown in FIG.
The rear end 3a of the door when the door is opened protrudes from the rear end 2a of the vehicle, and as a result, interference with the rear structure 10 behind the cab occurs.

That is, in the prior art, the width of the door cannot be increased beyond a certain value, and the visibility of the side surface of the cab is also limited.

The present invention has been made in view of the above points, and provides a construction machine having a cab having a door structure that does not interfere with a rear structure even if the door width is widened, thereby improving visibility. The purpose is to do so.

[0009]

According to the first aspect of the present invention, there is provided a lower traveling body, an upper revolving body rotatably provided on the lower traveling body, and a horizontal revolving body provided on the upper revolving body. A cab having a movable door, a work implement provided on the upper revolving structure and capable of protruding forward from the cab, and a rear structure provided lower than the cab on the rear side of the cab, wherein a door of the cab is provided. A door lower part located below the height of the rear structure, a door upper part located above the height of the rear structure and having a view-enlarging part projecting rearward from the door lower part, and a door lower part with respect to the door upper part And an interference prevention recess provided on the rear side of the construction machine.

Thus, the visibility can be improved by the visibility expanding portion at the upper part of the door, and the interference between the door and the rear structure when the door is opened can be prevented by the interference preventing recess at the lower part of the door.

According to a second aspect of the present invention, in the construction machine according to the first aspect, the cab and the rear structure are accommodated on the substantially revolving upper revolving unit, and the cab door is opened. A construction machine that is sometimes moved curvilinearly toward a rear structure.

[0012] Thus, in the in-vehicle revolving construction machine, even if the width of the upper part of the door is widened by the view enlarging part, the lower part of the door does not interfere with the rear structure due to the interference preventing recess, and the visibility is improved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIGS.

FIGS. 1 to 4 show an in-vehicle swing type construction machine, that is, an in-vehicle swing hydraulic excavator. As shown in FIGS. A cab 13 which is provided so as to be freely rotatable and covers the driver's seat and operation levers of the operator to form an operator's cab on the upper revolving unit 12, and a digging work machine (so-called A front work machine) 14 and a fuselage-side rear structure 15 such as an engine room provided at a position lower than the cab 13 behind the cab 13 are mounted respectively.

The lower traveling body 11 has crawler belts 16 mounted on left and right portions thereof, and has a discharge plate 17 between these crawler belts 16. Work machine
The boom 18, the arm and the bucket are sequentially connected to each other, and a hydraulic cylinder 19 for operation is provided on each of them.

The cab 13 is provided with a door 23 at a lift port 22 opened on the side surface of the cab body 21 so as to be movable in the horizontal direction along the side surface of the cab body 21. This door 23
FIG. 6 shows a sliding door shown in FIG. 5 or a lever door shown in FIG.

The door 23 of the cab 13 is roughly divided into a door lower portion 23a located below the height of the rear structure 15,
And a door upper part 23b located above the height of the rear structure 15.

The door 23 is structurally constructed of a door frame.
A partition plate 25 is provided inside 24, and a transparent plate 26 is fitted to these. The front end of the door frame 24 is linearly provided from the upper end to the lower end, while the rear end of the door frame 24 has a door upper part 23b having a view enlarging part 27 protruding rearward from the door lower part 23a. On the other hand, it is bent so that an interference preventing recess 28 is provided on the rear side of the door lower portion 23a.

The field-of-view expanding section 27 is provided at a height corresponding to the line of sight of the operator sitting in the driver's seat in the cab 13, and is effective for securing a wide-angle field of view to the operator. .

Then, as shown in FIG. 2, when the door is opened, the interference between the door 23 and the rear structure 15 is prevented by the interference preventing recess 28 in the door lower portion 23a.

As shown in FIG.
Is formed with a curved surface having substantially the same shape as the corner 15a of the rear structure 15, so that when the door is opened, the corner 15a of the rear structure 15 is formed.
And no contact with the corner 15a.

As shown in FIG. 4, the cab 13 and the rear structure 15 are accommodated on the upper revolving unit 12 formed in a substantially circular shape, and the door 23 of the cab 13 is shown in FIG. The sliding mechanism or the lever mechanism shown in FIG. 6 does not protrude from the upper swing body 12 when the door is opened.

As shown in FIG. 4, the rear structure 15 has a door 30 which is provided on a cover for covering the engine room so as to be opened and closed by a hinge 29. When the door is opened, the view expansion portion 27 of the door 23
It protrudes above this door 30, but the interference prevention recess at the bottom of the door
28 does not interfere with door 30. When opening the door 30 of the engine compartment, move the door 23 back to
Should be opened upwards.

As described above, in the present embodiment, when the door 23 of the cab 13 is fixed in the open state, the rear end of the door frame 24 is partially connected to the rear structure 15 located at the rear of the cab 13. It is configured to avoid interference.

That is, the lower portion of the rear end of the door frame 24 is deformed into a cutout shape so as not to interfere with the rear structure 15, so that when the door is closed as shown in FIG. The field of view on the side of the door can be expanded by that much, and the operator can easily work due to the expanded field of view and can improve workability.

Further, even if the width of the upper portion of the door is increased, the interference between the lower portion 23a of the door and the rear structure 15 can be prevented by the interference preventing recess 28 when the door is opened as shown in FIG.
Since the opening degree of the opening 23 can be increased, that is, the elevating opening 22 can be substantially enlarged, the operator can easily go up and down.

As described above, in the door structure of the cab 23 mounted on the in-vehicle turning hydraulic excavator, the door width can be made larger than before, and the door frame 24 prevents the rear structure 15 from interfering with the rear structure 15 when the door is opened. The rear end is deformed, so that visibility on the side of the door can be improved.

[0028]

According to the first aspect of the present invention, the door can be opened even if the door width is substantially increased in view of securing the visibility by the view expanding portion at the upper part of the door and the interference preventing recess at the lower part of the door. It is possible to provide a construction machine having a cab with a door structure that can sometimes prevent interference with a rear structure, improve visibility of the cab side surface of the construction machine, and further improve operator workability. it can.

According to the second aspect of the present invention, it is possible to improve the visibility of the side surface of the cab of the in-vehicle turning type construction machine, and further to improve the workability.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a construction machine according to the present invention, and is a side view of a cab when a door is closed.

FIG. 2 is a side view of the cab when the door is opened.

FIG. 3 is a rear view of the cab when the door is opened.

FIG. 4 is a plan view of the cab when the door is opened.

FIG. 5 is an explanatory view showing a sliding door in a cab of a conventional construction machine.

FIG. 6 is an explanatory view showing a lever type door in a cab of a conventional construction machine.

[Explanation of symbols]

 11 Lower traveling structure 12 Upper revolving structure 13 Cab 14 Work implement 15 Rear structure 23 Door 23a Door lower 23b Door upper 27 Enlarged field of view 28 Interference prevention recess

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Fujimoto 1-1-1 Shiohama, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term (reference) 2D015 EA03

Claims (2)

[Claims] A cab having a lower traveling body, an upper revolving body rotatably provided on the lower traveling body, a horizontally movable door provided on the upper revolving body, and a cab having a horizontally movable door. The cab is provided with a work implement that can be protruded forward from the cab, and a rear structure that is provided lower than the cab at the rear of the cab, and the cab door has a door lower part located below the height of the rear structure. A door upper portion having a visibility expanding portion which is located above the height of the rear structure and protrudes rearward from the door lower portion, and an interference preventing recess provided on the rear side of the door lower portion with respect to the door upper portion. A construction machine characterized by the above. 2. An upper revolving superstructure having a substantially circular shape,
The construction machine according to claim 1, wherein the cab and the rear structure are accommodated, and the door of the cab is curvedly moved toward the rear structure when the door is opened.