JP2000085475A - Getting-on/off step for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a getting-on/off step heightened in the effect of preventing damage caused by abutting an obstruction. SOLUTION: An elevating step disposed at the side face of a frame 2A of a lower structure of a construction machine and used to get on and off a driver' s cabin of a revolving super structure is provided with fixed parts 11 disposed inside the side ends of the frame 2A and rigidly fixed to the frame 2A, and step parts 12, 13, 14 supported at their base ends to the fixed parts 11 and arranged to protrude from the side ends of the frame 2A. At least part of the step parts is formed of flexible material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ascending and descending step used for getting on and off a construction machine in a driver's cab, and more particularly, to preventing damage caused by an external force.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 62-99663 discloses a lifting step provided in a wheel type work vehicle. In this example, a step is suspended via a pair of support members below a fuel tank or a hydraulic oil tank arranged on the side of the vehicle, and each support member is formed of an elastic body. Therefore, even if an obstacle such as a stone collides with the step, the impact can be absorbed by the elastic deformation of the elastic body, and breakage of the step can be prevented.

[0003]

However, in a crawler type construction machine such as a large hydraulic excavator, for example, the lifting step is provided so as to protrude to the side of the side frame of the lower traveling body. There is a case where a stone or the like directly collides with a connecting portion with the elevating step, and in this case, damage of the elevating step cannot be prevented.

It is an object of the present invention to provide an ascending and descending step of a construction machine with an improved effect of preventing damage due to contact with an obstacle.

[0005]

FIG. 2 shows an embodiment of the present invention.
4, the present invention is applied to an ascending / descending step which is disposed on the side of the frame 2A of the lower traveling unit 2 of the construction machine and is used for getting on and off the upper revolving unit 2 in the cab. A fixing portion 11 disposed inside the side end of the frame 2A and fixed to the frame 2A; and a step portion having a base end supported by the fixing portion 11 and arranged to protrude from the frame side end. 12, 13, and 14, at least a part of the step portion is made of a flexible material, thereby solving the above problem. According to the second aspect of the present invention, the step portion is rotatably supported on the fixed portion 11 in a plane substantially perpendicular to the vehicle longitudinal direction. According to a third aspect of the present invention, the step portion includes a supporting member 13 having an upper end connected to a connecting member 12 supported and connected to the fixed portion 11, and a step 14 supported at a lower end of the supporting member 13. The member 13 is made of a flexible material.
The invention of claim 4 is, for example, as shown in FIGS.
The step portion is supported by a connecting member 23 having one end connected to the fixing portions 21 and 22 and extending in a substantially horizontal direction, a supporting member 24 having an upper end connected to the connecting member 23, and a lower end of the supporting member 24. Step 25 and the connecting member 23
Is made of a flexible material. According to a fifth aspect of the present invention, the support member 24 is made of a flexible material.
According to a sixth aspect of the present invention, as the flexible material, rubber having rigidity which does not deform even when a force corresponding to the weight of a person is applied is used.

[0006] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments are used to make the present invention easier to understand. However, the present invention is not limited to this.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a construction machine (crawler hydraulic excavator) according to the present embodiment. The hydraulic excavator includes an upper revolving unit 1 and a lower traveling unit 2, and two front and rear elevating steps 10 are provided on a side portion of a side frame 2 </ b> A constituting the lower traveling unit 2.

FIGS. 2 to 4 show the structure of the lifting step 10. FIG. A pair of bosses 11 are arranged and fixed on the upper inclined surface of the side frame 2A in the vehicle longitudinal direction (A direction). Each of the bosses 11 is rotatably connected to each of the arms 12a of the substantially U-shaped upper step 12 by a pin 15, and a retaining pin 16 is attached to the pin 15. As can be seen from FIG.
A is located inside the side end face of A, and the upper step 1
2 is supported so that the tip protrudes from the end face on the frame side. The boss portion 11 is provided with a stopper 11a for preventing the upper step 12 from rotating downward from a horizontal state.

The upper end of the support plate 13 is non-rotatably connected to both arms 12a of the upper step 12 by pins 17, and both ends of the lower step 14 are turned by the pins 17 to the lower ends of both support plates 13. It is immovably linked. That is, the lower step 14 is suspended by the upper step 12 via the pair of support plates 13. The pair of support plates 13 are made of, for example, a rubber member into which thread-like fibers or the like are mixed.

When the operator gets on and off the operator's cab, he puts his feet on the upper and lower steps 12, 14, and at this time, a pulling force acts on the pair of support plates 13 via the lower step 14 according to the weight of the operator. However, the rubber support plate 1
Reference numeral 3 has a rigidity that does not deform with the weight of a person, so that there is no inconvenience that the step 14 sinks downward or swings in the longitudinal direction of the vehicle body when getting on and off.

At the time of work, vibration is applied to the vehicle body. However, since the support plate 13 is non-rotatably supported by the upper and lower steps 12, 14, the lower step 14 does not unnecessarily swing in the vehicle width direction. Also, at a crushed stone site or the like, a large stone or the like may collide with the ascending / descending step 10 projecting from the side frame 2A from below or in the vehicle front-rear direction (A direction). As shown in FIG. 5, since the upper step 12 rotates in the plane substantially perpendicular to the longitudinal direction of the vehicle body with respect to the boss portion 11 via the support plate 13, a large impact force acts on the lifting step 10. Absent. In particular, almost no force is applied to the connecting portion between the boss portion 11 and the side frame 2A, so that the damage can be prevented.

On the other hand, when an obstacle collides from the front and rear direction of the vehicle as shown in FIG. 6, the rubber support plate 13 is elastically deformed as shown in FIG.
Since no large force is applied to the connection between the first frame 1 and the side frame 2A, breakage can be prevented.

As described above, the boss portion 11 and the upper step 12
And the use of a rubber support plate 13 greatly contributes to prevention of breakage of the elevating step 10. However, if an obstacle collides directly with the boss 11 directly connected to the frame 2A, A large force is applied to the connection between the boss 11 and the frame 2A, and damage to that portion is inevitable. However, in the present embodiment, since the boss portion 11 is located inside the side end surface of the frame 2A, there is almost no possibility that an obstacle directly collides with the boss portion 11 and the boss portion 11 and the side frame 2A A large force does not act on the connecting portion, and damage can be reliably prevented.

In the above embodiment, the boss portion 11 serves as the fixing portion, the upper step 12 serves as the connecting member, and the support plate 13 serves as the connecting member.
The lower step 1 constitutes a step, and the upper step 12, the support plate 13 and the lower step 14 constitute a step portion.

In the above, the upper step 12 and the support plate 13
Are rotatably connected to each other, but they may be non-rotatably connected, for example, as shown in FIGS. 7 to 9. in this case,
The support plate 13 is also deformed by the upward pushing force on the lower step 14, absorbing the impact and preventing damage to some extent. If the upper step 12 is made of the same rubber member as the support plate 13, a further damage prevention effect can be expected. Further, the lower step 14 may be formed of rubber. As shown in FIGS. 10 to 12, a flexible material 13 'such as a wire or a chain may be used instead of the rubber support plate.

-Second Embodiment- A second embodiment of the present invention will be described with reference to FIGS. 13 to 16, a pair of brackets 21 are disposed and fixed to the side frame 2A of the lower traveling body 2 in the front-rear direction of the vehicle, and a substantially L-shaped bracket 22 is attached to each bracket 21 by bolts 26. I have. As can be seen from FIG. 14, the brackets 21 and 22 are located inside the side end surfaces of the frame 2A.

The horizontal support member 2 is
3 is connected to one end, and the other end of each horizontal support member 23 is connected to the upper end of a vertical support member 24. The pair of horizontal support members 23 are formed of rubber, and rubber plates 23a having male screws 23b protruding as shown in FIG. 17 are fixed to both ends thereof. Then, a pair of male screws 23b at one end side penetrates the bracket 22, and a nut 27 is screwed to a tip of the male screw 23b, whereby the horizontal support member 23 is non-rotatably connected to the bracket 22. Further, a pair of male screws 23b at the other end penetrate the vertical support member 25, and a nut 27 is screwed to a tip of the male screw 23b, whereby the horizontal support member 23 is non-rotatably connected to the vertical support member 25. Note that the plate 23a may be formed integrally with the support member 23 body.

The pair of vertical support members 24 are formed of rubber, and the lower ends thereof are connected to both ends of a substantially U-shaped step 25 via bolts 28 and nuts 29. That is, the step 25 is suspended by the horizontal support member 23 via the vertical support member 24. A stopper 2B for preventing the step 25 from directly contacting the side frame 2A is fixed to the side surface of the side frame 2A.

When the operator gets on and off the operator's cab, he steps on step 25. At this time, a pair of vertical support members 2
4 and a bending moment acts on the horizontal support member 23. However, the rubber support members 23 and 24 have rigidity that does not deform under the weight of a person, and there is no inconvenience that the step 25 sinks downward or swings in the vehicle longitudinal direction when getting on and off. Further, the step 25 does not swing due to the vibration of the vehicle body.

When a stone or the like collides with the step 25 from below during the operation, the horizontal support member 23 is elastically deformed via the vertical support member 24 as shown in FIG. No large force acts on the steps. On the other hand, when an obstacle collides from the vehicle front-rear direction as shown in FIG. 20, the support plate 13 is deformed as shown to absorb the impact force, and in this case also, a large force does not act on the lifting step. Further, since the brackets 22 and 23 are located inside the side end surfaces of the frame 2A, there is almost no possibility that an obstacle directly collides with the brackets 22 and 23. Therefore, a large force does not act particularly on the connecting portion between the bracket 22 and the side frame 2A, so that the damage can be reliably prevented.

The step 25 may also be formed of rubber. In the above description, the crawler-type hydraulic excavator has been described. However, the present invention can be applied to a lifting step of another construction machine (for example, a crane) as long as it is a lifting step provided along the side frame of the lower traveling body.

[0022]

According to the present invention, since the fixed portion of the lifting step is disposed and fixed inside the side end portion of the lower traveling frame, there is almost no direct collision of the obstacle with the fixed portion. Contributes to the prevention of breakage. Also, since at least a part of the step portion is made of a flexible material,
The impact force can be absorbed by the deformation of the portion, and a further damage prevention effect can be obtained. If the step portion is rotatably supported with respect to the fixed portion in a plane substantially orthogonal to the front-rear direction of the vehicle body, the step portion rotates by a thrust force from below, so that a large force does not act, and furthermore, Can be expected to have a breakage prevention effect. If the flexible material is a rubber having rigidity that does not deform to the extent that a force corresponding to the weight of a person is applied, the step portion is not undesirably deformed when the operator gets on and off, and stable getting on and off can be performed. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a side view showing a crawler type hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a front view of an elevating step according to the first embodiment.

FIG. 3 is a side sectional view of FIG. 2;

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a side sectional view showing a state where an obstacle collides from below.

FIG. 6 is a front view showing a state when an obstacle collides from the side (the longitudinal direction of the vehicle body).

FIG. 7 is a front view showing an elevating step according to another embodiment.

FIG. 8 is a side sectional view of FIG. 7;

FIG. 9 is a plan view of FIG. 8;

FIG. 10 is a front view showing an elevating step according to another embodiment.

FIG. 11 is a side sectional view of FIG. 10;

FIG. 12 is a plan view of FIG. 11;

FIG. 13 is a front view showing an ascent / descent step in the second embodiment.

FIG. 14 is a side sectional view of FIG. 13;

FIG. 15 is a bottom view of FIG. 13;

FIG. 16 is a cross-sectional view showing a connecting portion between a bracket, a horizontal support member, and a vertical support member.

FIG. 17 is a perspective view showing a configuration of a horizontal support member.

FIG. 18 is a side sectional view showing a state where a stone collides with a step from below.

FIG. 19 is a view similar to FIG. 18;

FIG. 20 is a front view showing a state in which a stone collides with a step from the side (the longitudinal direction of the vehicle body).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper revolving structure 2 Lower traveling structure 2A Side frame 10 Elevating step 11 Boss 12 Upper step 13 Support plate 14 Lower step 21, 22 Bracket 23 Horizontal support member 24 Vertical support member 25 Step

Claims (6)

[Claims] 1. A lifting and lowering step which is disposed on a side surface of a frame of a lower traveling structure of a construction machine and is used for getting on and off an upper revolving structure in a driver's cab. A fixed portion to be fixed, a step portion having a base end supported by the fixed portion and disposed so as to protrude from the frame side end portion, wherein the step portion is at least partially made of a flexible material A lifting / lowering step of a construction machine, characterized by being constituted. 2. The step of raising and lowering a construction machine according to claim 1, wherein the step portion is rotatably supported on the fixed portion in a plane substantially perpendicular to the longitudinal direction of the vehicle body. . 3. The step portion includes a supporting member having an upper end connected to a connecting member connected and supported by the fixing portion, and a step supported by a lower end of the supporting member. The step of raising and lowering a construction machine according to claim 1, wherein the step of lifting the construction machine is made of a flexible material. 4. The step portion includes a connecting member having one end connected to the fixed portion and extending in a substantially horizontal direction, a supporting member having an upper end connected to the connecting member, and a supporting member supported at a lower end of the supporting member. 2. The connecting member is made of a flexible material.
Lifting and lowering steps of the construction machine according to the above. 5. The step of lifting a construction machine according to claim 4, wherein said support member is made of a flexible material. 6. The construction machine according to claim 1, wherein said flexible material is made of rubber having a rigidity which does not deform when a force corresponding to the weight of a person is applied. Up and down steps.