JP2004044122A - Handrail structure in construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly fit and fix handrails 10, 11 without vibration, which are erected on the outer edge of an upper traveling body 2 provided on a lower traveling body 1 of a hydraulic shovel to freely revolve. <P>SOLUTION: The tip 10b of a front end part of a front handrail 10 is fixed and supported on a front cover body 6, a vertical part 10c a little away upward from the fixed and supported part is fixed and supported on a footrest step 8, and the supporting and fixing direction is dispersed in right and left different directions to form two-upper and lower point support structure, thereby increasing the strength. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of a handrail structure in a construction machine such as a hydraulic shovel.
[0002]
[Prior art]
2. Description of the Related Art Today, there are various types of construction machines, and the prior art will be described using a hydraulic shovel as an example. In the case of a hydraulic excavator, an upper revolving unit provided with a work attachment such as a bucket is supported rotatably on a lower traveling unit provided with a traveling device, and an engine or the like is mounted on such an upper revolving unit. Therefore, a moving space for performing these maintenances is secured on the upper surface of the upper rotating body. For example, when getting on or off the traveling space from the traveling device, a step is provided on the upper revolving structure to facilitate getting on and off, and a passage from the step riding portion to the engine room is formed. However, these steps and passages are often formed at the end of the upper revolving structure, so that the handrail stands upright from the edge of the upper revolving structure so as not to disturb the moving operator. Is provided. As such a handrail, a conventional handrail having a configuration in which one lower end (front end) is fixed to a body frame and the other lower end (rear end) is fixed to a body side plate is known. However, such a handrail has a so-called cantilever support structure in which the lower end is supported on the fuselage side and projects upward, so that the handrail vibrates following the vibration of the fuselage. There is a concern that a large load may act on the fixing portion, causing problems such as deformation and breakage of the fixing portion and loosening of the tightening bolt.
[0003]
[Problems to be solved by the invention]
Therefore, as measures against this, increase the strength by increasing the thickness of the handrail or using a thick gauge, fix it with a bracket that is more rigid than the main body of the handrail, and place an anti-vibration member in the middle of the handrail. It is advisable to take anti-vibration measures such as mounting. However, in such a case, if there is torsion as a cause of the main body damage, the effect is adverse, and there is a concern that the main body side may be damaged, and reinforcement of the main body side is required. There is a problem such as an increase in cost, and there is a problem to be solved by the present invention.
[0004]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made with a view to solving these problems. The invention of claim 1 provides a step surface that can pass through the upper surface of the body, In a construction machine having a handrail on an outer edge, the handrail has a handrail structure in which a front end portion and an upper portion separated from the front end portion are fixed to a body side. It is. With this configuration, the handrail is supported on the fuselage side by a two-point support structure of the tip portion and the upper portion thereof, so that the effective strength can be increased and unnecessary vibration can be prevented. .
According to a second aspect of the present invention, there is provided the handrail structure in the construction machine according to the first aspect, wherein the fixing of the upper portion of the handrail is a step for footrest provided to get on and off the step surface. By doing so, it is possible to reinforce the handrail by using a solid step as a footrest. .
According to a third aspect of the present invention, in the first or second aspect, the fixing of the upper portion of the handrail is a handrail structure for a construction machine, wherein the cover body forms a step surface. Thus, the strength of the handrail can be increased by effectively using the cover body forming the step surface.
According to a fourth aspect of the present invention, in the first, second or third aspect, the lower end of the handrail is fixed to be displaced to one side in the left-right direction, and the upper side is fixed to be displaced to the opposite side. This feature is a handrail structure of a construction machine, and by doing so, the upper and lower two-point support directions of the handrail can be dispersed to the left and right, and the strength of the support of the handrail can be increased.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a lower traveling body that constitutes a hydraulic shovel, and 2 denotes an upper revolving body that is rotatably supported by the lower traveling body 1. Various member devices such as a cab 3 disposed on the left side of the vehicle, a boom 4 to which a bucket-type attachment projecting forward from a front central portion is attached, and a cover 5 disposed on a rear portion to form an engine room. In the present embodiment, front and rear cover bodies 6 and 7 for covering tanks such as a hydraulic oil tank and a fuel tank are provided on the right side of the machine body. The upper surfaces (top plate surfaces) of the cover bodies 6 and 7 serve as a boarding step so that an operator can move to the engine room side cover body 5. Further, steps 8 and 9 are provided on the front end surface of the front side cover body 6 and the body frame 2a of the upper revolving unit 2 for stepping on and off the cover body 6 so that the operator can wear the lower traveling unit 1 on the foot. After getting on the body 1a, it is configured to be able to get on and off without difficulty using the steps 8 and 9.
[0006]
Reference numeral 10 denotes a front handrail, and 11 denotes a rear handrail (corresponding to the handrail of the present invention). These handrails 10 and 11 are arranged on the right edges of the cover bodies 6 and 7 in a standing manner. However, the front end of the front handrail 10 is formed with a bent portion 10a bent downward and rearward, and the bent front end portion 10b is deviated rightward. It is bolted to the lower right side of the. The front handrail 10 has a vertical portion 10c extending upward from the bent portion 10a to a position slightly higher than the step 8 in a substantially vertical state, and the front handrail 10 is inclined forward and backward from a vertical upper end (slightly upward). The rear end 10e, which is bent horizontally and rearward, is fixed to the front upper end of the rear handrail 11, but is located at the forefront of the handrail 10. The vertical portion 10c is fixedly supported by the step 9 at a position deviating leftward via the bracket 12.
[0007]
On the other hand, the rear handrail 11 is bent in a substantially inverted U-shape, and the lower end portion 11b of the front side portion 11a is bolted to a rear surface portion 6a that rises in a step-like shape of the front cover body 6, and the upper half side middle portion is formed. The rear end 10e of the front handrail 10 is fixed. The rear side portion 11c of the rear handrail 11 is supported by being fitted and fixed to a cylindrical support 13 having a lower end fixed to the upper surface of the rear cover body 7 at a lower end. Further, the rear support front side portion 11a is fixed to the front cover body rear surface portion 6a via the bracket 14 at a position slightly higher than the support position of the front end lower end 11b.
[0008]
In the configuration described above, the front handrail 10 is fixed such that the front bent end portion 10b and the vertical portion 10c slightly separated from the front end side are supported at two points on the fuselage side. As a result, the front handrail 10 has a strong support structure on the lower end side, thereby preventing inadvertent vibration. In addition, the front end 11a of the rear handrail 11 also has an up-down two-point support structure, so that the strength can be increased.
[0009]
Still further, regarding the front handrail 10, the vertical portion 10c is fixed to the step 8 where the strength is increased as much as a footrest, so that the fixing strength is also increased. Further, the bent front end portion 10b of the front handrail 10 is fixed to the cover body 6 so as to be deviated rightward, and the upper vertical portion 10c is deviated to the left side via the bracket 12 in step 8. As a result, the front side of the front handrail 10 has a support structure distributed to the left and right, thereby further increasing the strength and suppressing the generation of vibration.
[0010]
On the other hand, as for the rear handrail 11, the front side portion 11a has a fixed structure in which the front side portion 11a is supported at two points by the cover body 6, and the cover body 6 is also used as a supporting member. Since the rear surface portion 6a is formed so as to rise up, a reasonable supporting structure is obtained while using the cover body 6. Incidentally, since the rear end side of the rear handrail 11 is fitted and supported by the tubular support 13, it is possible to firmly support the rear side.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator.
FIG. 2 is a plan view of the hydraulic excavator.
FIG. 3 is a front view of the hydraulic excavator.
FIG. 4 is an enlarged front view of a main part of a handrail mounting portion.
[Explanation of symbols]
6 Cover body 9 Step 10 Front handrail 11 Rear handrail 12 Bracket 14 Bracket

Claims (4)

In a construction machine having a step surface that can pass through the upper surface of a body and a handrail provided on an outer edge of the step surface, the handrail includes a body having a tip portion and an upper portion separated from the tip portion. A handrail structure for a construction machine fixed to a side. 2. The handrail structure of a construction machine according to claim 1, wherein the fixing of the upper part of the handrail is a step for footrest provided to get on and off the step surface. 3. The handrail structure according to claim 1, wherein the upper portion of the handrail is fixed by a cover that forms a step surface. 4. A hand in a construction machine according to claim 1, wherein the lower end of the handrail is fixed to be displaced to one side in the left-right direction, and the upper side is fixed to be displaced to the opposite side. Rail structure.

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