JPH08165683A - Turning safety device of construction machine - Google Patents

Abstract

PURPOSE: To inform beforehand that there is no fear of contacting to an obstacle in a turning condition, by holding a rod at the projecting position, and projecting the rod to the outer side more than the turning radius. CONSTITUTION: To the side track frame 5 of a lower running body, and a support block body 6 fixed thereto, rod holes 7 orthogonal to the longitudinal direction of the side track frame 5 are provided, and a rod 8 is inserted slidable. To the rod 8, circular grooves 9 and 10 in order to hold the rod 8 at the projecting position and at the retreated position are formed. And a hole 11 for locking opened to the rod holes 7 is provided to the support block body 6, and a ball 12 to insert to both circular grooves selectively, and a spring 13 to press the ball 12, are housed in the hole 11. In a working condition, the rod 8 is projected by a manual operation so as to insert the ball 12 in the circular groove 9, and an outrigger plate 15 is positioned to the outer side more than the turning radius of the upper side rotary body. As far as an obstacle is at the outer side of the outrigger plate 15, the construction machine is never hit to the obstacle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing safety device for an upper swing body in a construction machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art A turning safety device for ensuring safety when turning a construction machine without impairing maneuverability in a narrow space is disclosed in Japanese Utility Model Publication No. 6-43061. This turning safety device, as shown in FIG.
It is composed of a plurality of sets of side bumpers 33 attached to one left and right lower frame 32. The links 34 and 35 that form the side bumper 33 are connected to a bracket 36 that is fixed to the lower frame 32, and the tips of both links 34 and 35 are connected to each other by a link 37. A bar 39 is installed on a connecting portion 38 between the link 35 and the link 37 of each set. When the connecting portion between the link 34 and the link 37 is pressed from the outside in the arrow P direction, the side bumper 33 is folded and stored in the bracket 36. When the side bumpers are projected, the left and right side bumpers 33, 33
The entire width is formed to be equal to or larger than the swing diameter of the upper swing body.

[0003]

In the above turning safety device, since the side bumper 33 is constituted by a quadrilateral link mechanism, there is no problem in manually operating it, but in the case of operating by a cylinder or the like, the link mechanism is used. Since it is required for the cylinder to perform both expansion and contraction movement and rotation movement, it is difficult to arrange the cylinder on the track frame due to space. Also, since the link mechanism is located close to the ground, it can be
If rocks etc. bite into the link mechanism, it will be difficult to remove them, and if they are operated while biting,
The link may be deformed and rendered inoperable. Further, since the connecting portion formed by the pin of the link projects to the outside of the track frame, the influence of dust on the connecting portion cannot be avoided.

The present invention has been made in view of these, and an object of the present invention is to provide a turning safety device having a rod as a constituent element, having a simple structure and operating reliably.

[0005]

According to another embodiment of the present invention, there is provided a turning safety device in which a rod is supported by a track side frame of a lower traveling body so that the rod can be moved left and right, and the rod has a protruding position which is equal to or larger than a turning radius of an upper rotating body. And holding means for fixing at a predetermined retracted position.

[0006]

The rod is held in the projecting position during the operation of the construction machine, and the rod is extended outward beyond the turning radius so that the rod is retracted during traveling so that the rod is within the transportation width.

[0007]

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

An upper revolving structure 2 having a driver's cab 3, a counterweight 4, etc., is rotatably mounted on the lower traveling structure 1. A working machine (not shown) is attached to the front of the upper swing body 2.

Side track frame 5 of undercarriage 1
The supporting block body 6 fixed to this is provided with a rod hole 7 orthogonal to the longitudinal direction of the side track frame 5, and a rod 8 is slidably inserted into the rod hole 7. There is. The rod 8 is formed with annular grooves 9 and 10 for holding the rod 8 in the protruding position and the retracted position. The support block 6 is provided with a locking hole 11 that opens into the rod hole 7, and a ball 12 that is selectively fitted into the annular grooves 9 and 10 and a spring 13 that presses the ball 12 are housed in the hole. Spring 1
3 is held by a bolt 14 attached to the lock hole 11. A plate 15 for overhanging is provided on the outer end of the rod 8.
Are provided integrally.

When working on the construction machine, the manual operation
As shown in FIG. 3, the rod 8 is projected, the ball 12 is fitted into the annular groove 9, and the overhanging plate 15 is positioned outside the swing radius r of the upper swing body 2 as shown in FIG. Therefore, when excavation work is performed, if the left and right overhanging plates 15 are projected and the turning range of the upper swing body 2 is confirmed in advance to position the construction machine, when an obstacle exists around the fuselage, However, if the obstacle is located outside the overhanging plate 15, the upper swing body 2 does not hit the obstacle during the swing.

When traveling, the rod 8 is retracted so that the annular groove 1
Fit ball 12 into 0 to fix rod 8 in that position. In this state, the overhanging plate 15 fits inside the vehicle radiation.

FIG. 4 shows another embodiment of the present invention in which the cylinder 16 is attached to the track side frame 5 and the overhanging plate 15 is fixed to the tip of the piston rod 16a thereof by the nut 17. The cylinder 16 is operated to hold the projecting plate 15 in the projecting position and the retracted position.

The effect of the turning safety device can be further enhanced by incorporating a display illuminator into the above-mentioned plate 15 for projection and causing the display illuminator to blink when the plate 15 for overhang is projected.

[0014]

According to the present invention described above, the turning range at the time of work can be confirmed in advance by holding the rod at the protruding position. Therefore, when there is an obstacle on the outside of the protruding rod, it can be predicted that there is no danger of contacting the obstacle when the upper swing body turns, and the attention of the operator to the rear of the driver's seat can be reduced. .
Further, by retracting the rod, the construction machine can easily enter the narrow space. In addition, since the main element that constitutes the safety device is the rod, the structure is simple and maintenance is easy.

[Brief description of drawings]

FIG. 1 is a rear view showing an embodiment of the present invention,

2 is a side view of FIG. 1,

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view corresponding to FIG. 3, showing another embodiment of the present invention;

FIG. 5 is a cross-sectional rear view of an undercarriage of a construction machine equipped with a known turning safety device.

[Explanation of symbols]

 1 Lower traveling body 2 Upper revolving structure 5 Track side frame 7 Rod hole 8 Rod 9 Annular groove 10 Annular groove 11 Lock hole 12 Ball 13 Spring 14 Bolt 15 Overhanging plate 16 Cylinder 16a Piston rod

Claims (2)

[Claims] 1. In a construction machine in which an upper revolving structure is rotatably mounted on a lower traveling structure, a rod is supported by a track side frame of the lower traveling structure so as to be movable left and right,
A turning safety device comprising a holding means for fixing the rod to a protruding position equal to or larger than the turning radius of the upper turning body and a predetermined retracted position. 2. The turning safety device according to claim 1, wherein an overhanging plate is integrally provided on an outer end portion of the rod.