JPH09111809A - Step device for ascending and descending crawler type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the amount by which two steps provided on a side frame project toward the outside of the side frame to be minimized and to form the steps into stairs. SOLUTION: This step device 20 comprises two of upper and lower steps 22, 23 mounted on a mounting plate 21, the lower step 22 being projected outward form the mounting plate 21, the upper step 23 being extended in the direction opposite to the lower step 22, i.e., toward an inclined face part 6c formed between the upper surface 6a and the side face part 6b of the side frame 6. A lower end part at the end of the upper step 23 is made to abut to the inclined face part 6c to thereby form the two of upper and lower steps 22, 23 into stairs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type vehicle such as a hydraulic excavator, a hydraulic crane or the like, which relates to an elevating step device provided on a side frame for an operator to ascend and descend to a driver's cab.

[0002]

2. Description of the Related Art As a typical crawler type vehicle,
There is a hydraulic excavator shown in FIG. In the figure, 1 is a crawler type lower traveling body, and 2 is an upper revolving structure. The undercarriage 1 has a drive tumbler 3 as a drive wheel and an idler 4 as a driven wheel.
Crawler track 5 that forms an infinite running track between the idler 4 and the idler 4.
Is provided by winding. These drive tumbler 3, idler 4 and crawler belt 5 constitute a traveling unit. The traveling units are arranged on the left and right sides of the vehicle, and these left and right traveling units are driven by independent hydraulic motors.

The drive tumbler 3 and the idler 4 are mounted on both ends of the side frame 6. Although not shown, the side frame 6 is connected to a center frame, and the upper swing body 2 is rotatably installed on the center frame via a swing wheel 7. Although not shown, the upper revolving superstructure 2 is provided with a front working mechanism including a boom, an arm, a bucket, and the like. Further, operations such as traveling of the vehicle, revolving of the upper revolving superstructure 2, and operation of the front working mechanism are performed. In order to carry out the above, an operator's cab 8 in which an operator is boarded is provided.

In order for the operator to move up and down to the cab 8,
Handrails 9 are attached to appropriate portions of the frame of the upper swing body 2 and the frame of the cab 8. The handrail 9 is held by hand, and the crawler belt 5 is generally used as a scaffold. That is, the crawler belt 5 is reversed from the ground contact surface at the winding portion of the drive tumbler 3 and the idler 4, but this reversal is performed, and the foot is applied to the portion between the drive tumbler 3 and the idler 4 located above. Try to rise. With a small hydraulic excavator, there is no particular difficulty in putting the foot on the crawler belt 5. However, in some large hydraulic excavators, the crawler belt 5 may be located at a height of 1 m or more above the ground. In such a large hydraulic excavator, the operator cannot directly put the foot on the crawler belt 5 from the ground. The side frame 6 can also be used as a scaffold, but from the standpoint of improving mudguard strength and strength, as shown in FIG.
The side frame 6 cannot be used as a scaffold when the inclined surface portion 6c is formed between a and the outer side surface portion 6b.

For this reason, the side frame 6 is provided with steps. If the height from the ground to the upper surface of the crawler belt 5 is 110 cm or less, if one step is provided at a position 70 cm or lower from the bowl surface, the distance to the upper surface of the crawler belt 5 will be 40 cm or less. No, but at higher heights, two steps must be provided.

FIG. 4 shows an example of a step device 10 having two steps according to the prior art. The step device 10 has a mounting plate 11 which is fixed to the side surface portion 6b of the side frame 6 by a bolt or the like, or is fixed by welding or the like.
Steps 12 and 13 are provided over the steps. When the distance from the upper step 13 to the upper surface of the crawler belt 5 is large, the mounting plate 11 is made to project upward as shown in FIG. 5, and the upper step 13 is arranged at a higher position. .

[0007]

In the step device 10 described above, both the upper and lower steps 12 and 13 project outward from the side frame 6, but the feet are placed on these steps 12 and 13. Sometimes, a certain width is needed to stabilize it. The widthwise dimension on which this foot is placed is usually at least 15
It is required to be about cm. Therefore, in the step device 10, steps 12 and 13 in two steps from the attachment plate 11 attached to the side surface portion 6b of the side frame 6 are arranged.
Will project outward by 15 cm or more. As described above, the large outward projection of the steps 12 and 13 is not only preferable from the viewpoint of appearance, but also may collide with rocks, structures, or the like to be deformed or damaged. Get higher Further, since these steps 12 and 13 are in the form of a ladder, it is not always convenient for the operator to move up and down.

The present invention has been made in view of the above points, and it is an object of the present invention to minimize the protrusion of a step toward the outside of the side frame.

[0009]

In order to achieve the above-mentioned object, the present invention is provided with an outer side surface portion of a side frame.
The mounting member is fixedly provided, and the lower step is provided on the mounting member outwardly, and the upper step is provided on the inclined surface side of the side frame.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Since the side frame to which the step is attached has an inclined surface portion between the upper surface portion and the side surface portion, the space of this inclined surface portion is used as a space for disposing the step. Of the two steps attached to the attachment portion, the lower step extends outward from the side frame. Then, the mounting plate is projected to the position of the inclined surface portion, and the upper step is made to extend in the direction of the inclined surface portion at the position of the inclined surface portion. In other words, the lower step and the upper step are extended in opposite directions with the mounting plate sandwiched therebetween, and the two steps are stepwise.

As a result, only the lower step protrudes outward from the mounting plate to improve the appearance, and the upper step is unlikely to collide with rocks or other structures, and is not damaged or deformed. There is no fear of Therefore,
The upper step is not required to have structural strength as much as the lower step. Normally, the step is cantilevered, although one end is fixed to the mounting plate. Therefore, if the tip of the upper step is brought into contact with the inclined surface portion of the side frame, the upper step can be made more stable. Further, it is more convenient to move the steps up and down rather than the ladder-like one, and since it is possible to keep the body of the person moving up and down stable, it is possible to safely move up and down.

[0012]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In these figures, the same or equivalent members as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In these drawings, reference numeral 20 denotes a step device, and the step device 20 is mounted on a mounting plate 21 so as to be vertically movable.
The steps 22 and 23 of the step are attached.
Then, the step device 20 is fixed to the side surface portion 6b of the side frame 6 by using the bolt 24. In addition, 2
Reference numeral 5 is a pedestal for mounting the bolt 24. The above configuration is not particularly different from the above-described prior art.

Steps 22 and 2 provided in upper and lower two stages
Of the three, the lower step 22 projects outward from the mounting plate 21, that is, in the direction away from the side frame 6, but the upper step 23 is in the opposite direction to the lower step 22, that is, the side frame 6 side. Have been extended to.
Here, the side frame 6 includes an upper surface portion 6 a and a side surface portion 6.
An inclined surface portion 6c is formed between the inclined surface portion 6b and b, and a space exists as much as the inclined surface portion 6c is formed. The upper step 23 extends toward this space. Moreover, the lower end portion of the upper step 23 on the tip side is in contact with the inclined surface portion 6c.

The present embodiment is constructed as described above. In this step device 20, there are two steps.
Despite being provided with steps, only the lower step 22 projects outwardly of the side frame 6, so it looks better than both steps projecting outward. Will get better. Also, upper step 2
Since 3 is arranged so as to sneak under the crawler belt 5, there is no risk of rock falling or colliding with structures or other obstacles during running or working. Therefore,
The upper step 23 is much less likely to be deformed or damaged than the lower step 22 protruding to the outside of the side frame 6.

To move up and down to the operator's cab 8, the operator holds the handrail 9 provided on the upper swing body 2 with his / her foot on the lower step 22, and puts the other foot on the upper step 23. Since the upper step 23 is located above and below the lower step 22 and the step device 20 is in a staircase state, the step device 20 can be easily and surely moved up and down, and the operator's body is stabilized even during the up and down operation. Since the front of the upper step 23 is open, the toes of the toes can be located in front of the upper step 23, so that the foot can be put on reliably even if the width is narrowed. Moreover, the upper step 23 is held in a more stable state by bringing the tip portion of the upper step 23 into contact with the inclined surface portion 6c of the side frame 6.

The lower step 22 and the upper step 23 constituting the step device 20 are formed by fixing both ends of a metal plate body bent in a U shape to the mounting plate 21 by welding or the like. Step 22 needs to have a certain width, and in order to prevent deformation or damage even if a rock or the like collides, it is necessary to provide at least one metal plate body in the middle in order to improve its strength. is there. Upper step 23 with narrow width and less possibility of collision with rocks
Can provide sufficient strength without the provision of such an intermediate metal plate body, so the upper step 2
The configuration of 3 becomes simpler.

[0018]

As described above, according to the present invention, the mounting member is provided with the lower step outward, and the upper step is provided toward the inclined surface side of the side frame.
It is possible to minimize the protrusion of the steps toward the outside of the side frame, and to form the steps in a stepwise manner.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing a state in which a step device showing an embodiment of the present invention is mounted on a side frame.

FIG. 2 is an external view of a step device separated from a side frame.

FIG. 3 is an external view of a hydraulic excavator as an example of a crawler type vehicle equipped with a step device.

FIG. 4 is an explanatory diagram of a configuration in which a step device according to a conventional technique is attached to a side frame.

FIG. 5 is a structural explanatory view showing a state in which a step device according to another conventional technique is mounted on a side frame.

[Explanation of symbols]

 1 Lower Traveling Body 2 Upper Revolving Body 5 Crawler Track 6 Side Frame 6a Upper Surface 6b Side Surface 6c Sloping Surface 20 Step Device 21 Mounting Plate 22 Lower Step 23 Upper Step

Claims (2)

[Claims] 1. A side frame is provided with a drive wheel and a driven wheel at both ends thereof, and a lower traveling body having a crawler belt wound between the drive wheel and the driven wheel is provided, and an upper end portion of the side frame is outside. In a crawler type vehicle that does not have an inclined surface portion that is inclined in the direction, and the outer side surface of the side frame is provided with a step for raising and lowering to the cab provided in the upper swing body, the side surface of the side frame is A step for raising and lowering a crawler type vehicle, characterized in that a mounting member is fixedly provided, and a lower step is provided on the mounting member outwardly, and an upper step is provided toward an inclined surface side of the side frame. apparatus. 2. The step device for raising and lowering a crawler type vehicle according to claim 1, wherein the upper step is provided in a state of being brought into contact with an inclined surface portion of the side frame.