JP2002105986A - Revolving work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such an inconvenience that protrusions are formed to stand firm on operating or so as not to slip on arising to the cab at the front end part or right or left side end of the step against conventional operators for the revolving structure, but the parts number is many and the assembling works are complicated, because the protrusions are separately formed and further because the protrusions are set up low, it is difficult to effectively stand firm and hence, he can not operate in a stable posture in some cases. SOLUTION: Foot rests 31 protruding from steps 20 are integrally formed from the front end part of the steps 20 to the right and left front corners and the footrest 31 is constituted to form a slope face 31a so that the height thereof decreases as it goes back from the right and left front corners 20a of the steps 20, and the upper face edge of the footrest 31 is angularly shaped and a protrusion 32 is formed at the rear side of the footrest 31 in the right and left ends of the steps 20, and the height of the footrest 31 is formed to be lower than the height of the protrusions 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction of a turning work vehicle such as a micro turning work vehicle having a reduced turning radius.

[0002]

2. Description of the Related Art Heretofore, a turning work vehicle has been provided with a step in front of a driving unit, and the step is provided with a lever stand on which an operation lever is disposed, an operation pedal, and the like. The operation lever protrudes from the lever stand to the outside, and a seal member is interposed between the operation lever and the lever stand to seal the inside and outside of the lever stand. In addition, at the front end and the left and right ends of the step, a projection protruding from the step surface was formed in order to depress a foot during a driving operation or to prevent slipping when going up and down to the driving unit. . The sealing member is shown in FIG.
4. Like the seal member 101 shown in FIG. 15, the operation lever 102 passes between the operation lever 102 and the lever stand 109 and substantially at the center of a seal portion 101c formed of a flat elastic member. The slit 101b is formed from the through hole 101a toward both ends in the longitudinal direction.

[0003]

Since the projection is formed separately from the step, the number of parts is increased and the assembling work is complicated. Also, the protrusions are formed at the front end mainly for stepping on the foot, and the portions formed at the left and right ends are mainly used as a non-slip when ascending and descending. The part is formed at a substantially constant height as a whole, and its height is set low so as not to interfere with ascent and descent, so the step with the step surface is not so large, it can be effectively depressed In some cases, it was not possible to operate the vehicle in a stable posture because of the difficulty.

When the operation lever 102 is operated from the portion of the passage hole 101a to the end in the longitudinal direction, the seal member 101 is pushed upward and outward by the operation lever 102 passing through the slit 101b. However, since the bending angle θ0 of the seal portion 101c at this time is large, a large force is applied to the bent portion, and there is a possibility that cracks may occur over time. Further, since the seal portion 101c of the seal member 101 is formed in a flat plate shape, mud or the like easily accumulates on the seal portion 101c. When the operation lever 102 is operated with the mud or the like accumulated, the lever stand 10
There is a possibility that mud or the like may enter the inside of the nozzle 9 and cause erroneous operation.

[0005]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, as described in claim 1, a boom rotatably attached to a revolving structure configured to be pivotable, an arm rotatably attached to the boom,
In a turning work vehicle including a work implement having a work attachment rotatably attached to the arm, a footrest protruding from the step is integrally formed from a front end portion of the step to a left and right front corner portion, and As the footrest goes backward from the left and right front corners of the step,
The height was configured to decrease gradually.

According to a second aspect of the present invention, the upper surface edge of the footrest is angular.

According to a third aspect of the present invention, a protrusion is formed behind the footrest at the left and right ends of the step, and the height of the footrest is formed higher than the height of the protrusion.

According to a fourth aspect of the present invention, there is provided a boom rotatably attached to a revolving structure which is configured to be revolvable,
In a turning work vehicle including a work implement having an arm rotatably attached to the boom and a work attachment rotatably mounted to the arm, an operation lever protruding from inside a casing to the outside is provided. A sealing member for sealing between the casing and the casing was formed in a shape in which the central portion was raised from the edge.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a turning work vehicle of the present invention, FIG. 2 is a front view thereof, FIG.
4 is a plan view showing steps, FIG. 5 is a side view of the same, FIG. 6 is a front view of the same, FIG.
8 is a cross-sectional view taken along the line BB in FIG. 4, FIG. 9 is a view showing a state where a foot is put on an inclined surface of a footrest, FIG. 10 is a side view showing an operation lever provided on a lever stand, and FIG. FIG. 12 is a side sectional view of FIG.
13 is a front sectional view showing the same, FIG. 14 is a plan view showing a conventional seal member, and FIG. 15 is a front sectional view showing a conventional seal member.

First, a schematic configuration of a turning work vehicle according to the present invention will be described. As shown in FIG. 1 to FIG. 1, the turning work vehicle supports a revolving unit 2 at the upper center of the crawler type traveling device 1 so as to be able to turn left and right. 3 is disposed so as to be rotatable up and down. Above the revolving superstructure 2, a bonnet 14 for covering an engine or the like is provided.
6 is attached. In front of the seat 16, levers such as an operation lever 18 for performing a driving operation and the like are arranged on a lever stand 19 erected at the front end of the step 20, and operation is performed on both sides of the lever stand 19. An operation operation unit 15 configured by disposing the pedals 70 and 71 is provided.

A boom bracket 1 is provided at the front end of the swing body 2.
The lower end of the boom 6 is supported on the boom bracket 12 so as to be vertically rotatable. The boom 6 is bent forward at an intermediate portion, and is formed in a substantially "<" shape having a bent portion 6d in a side view. An arm 5 is rotatably supported at an upper end of the boom 6, and a bucket 4 as a work attachment is rotatably supported at a tip of the arm 5.
A working machine 7 is configured by the boom 6, the arm 5, the bucket 4, and the like.

The boom 6 is connected to the boom cylinder 1
1, the arm 5 is rotated by the arm cylinder 10
The bucket 4 is rotated by the
Is rotated. The boom cylinder 11,
The arm cylinder 10 and the bucket cylinder 9 are configured as hydraulic cylinders, and each of the cylinders 9, 10, and 11 is driven to expand and contract by supplying hydraulic oil from a hydraulic pump disposed in the hood 14 of the swivel base 2 through a hydraulic hose. Have been. The boom bracket 12 is rotatable left and right with respect to the swing body 2 by a swing cylinder 32.

Next, the configuration of step 20 will be described. . As shown in FIGS. 4 to 6, at the front end of the step 20, a lever stand 1
An operation pedal 70 is provided on the left and right sides of the lever stand 19.

At the periphery of the step 20, from the vicinity of the front end where the operation pedals 70 and 71 are provided, to the left and right front corners 20a of the step 20, and further to the left and right end portions, the upper surface of the step 20 An upwardly projecting footrest 31 is formed integrally with the step 20. The footrest 31 is formed so that its height gradually decreases as it goes rearward from the left and right front corners 20a, and an inclined surface 31a is formed at the rear of the left and right front corners 20a so as to incline forward and backward. ing.

Step 2 behind the footrest 31
At the left and right peripheral edges, a projection 32 projecting above the upper surface of the step 20 is formed integrally with the step 20. The protrusion 32 is divided into a plurality by a groove 32a. The height h2 of the projection 32 is formed to be lower than the height h1 of the footrest 31, and the height of the rear end of the inclined surface 31a that gradually decreases rearward is equal to the height of the projection 3.
2 and the height h2. The height h1 of the footrest 31 is formed as high as possible so as not to obstruct the operation of the operation pedals 70 and 71, and the projection 32 is formed relatively low so as not to obstruct the operation when ascending and descending. .

As described above, the footrest 31 is formed in the step 20 so that the operator can step on the footrest 31 while performing the driving operation of the turning operator. In particular, since the footrest 31 is formed higher than the projection 32 at the end of the step 20, the upper surface of the step 20 and the upper surface 31 of the footrest 31 are formed.
The step with b is large and can be effectively stepped on.

As shown in FIG. 7, the edge 31c of the upper surface 31b of the footrest 31 is formed in an angular shape, and is not subjected to chamfering or rounding. Similarly, as shown in FIG. 8, the edge 32c of the upper surface 32b of the projection 32 is not subjected to chamfering or rounding, but is formed in an angular shape.

As described above, the upper surface 31 of the footrest 31
b, the edge 31c of the footrest 3
When the foot is put on the upper surface of the device 1, the edge 31c is caught on the sole, so that the foot can be firmly pressed without slipping. Also, the edge 32 of the upper surface 32b of the protrusion 32
By making c square, the upper surface 32 of the projection 32 can be
When the foot is put on b, the edge 32c is hooked on the sole of the foot, so that the foot can be lifted and lowered in a stable posture without slipping.

Further, as shown in FIG. 9, by forming a slope 31a having a front height and a low height on the footrest 31, it is possible to put a foot on the slope 31a with a natural posture such as an ankle angle and to step on the slope 31a. Yes, fatigue during driving operation can be reduced.

Next, the operation lever 18 and the lever stand 1
9 will be described. As shown in FIG. 10, the operation lever 18 provided on the lever stand 19 has a rotation center 18 a disposed inside the lever stand 19, and an operation portion 18 b protruding outside the lever stand 19. A seal member 51 is interposed between the operation lever 18 and the lever stand 19.

The seal member 51 is formed by forming a through hole 51a through which the operation lever 18 passes at a substantially central portion of the seal portion 51c, and a slit is formed from the through hole 51a toward both ends in the longitudinal direction. 51b are formed. The seal portion 51c is formed in a dome shape in which a central portion is raised more than an edge portion, and has a substantially arc shape that gradually slopes from a horizontal state to a vertical state as going from the central portion to the edge portion in cross-sectional view. ing.

When the operating lever 18 is operated from the passage hole 51a to the end in the longitudinal direction, the sealing member 51 moves the operating lever 1 through the slit 51b.
8, the seal portion 51 is pushed outward.
Since c is formed in a dome shape as described above, the bending angle θ1 of the seal portion 51c at this time can be suppressed small,
The degree of deformation of the seal portion 51c is small. As described above, the seal portion 51c is operated by operating the operation lever 18.
Since the degree of deformation is small, the force applied to the bent portion is also small, so that cracks and cracks can be prevented.

The seal member 51 is provided with a seal portion 61c.
Is formed in a dome shape in which the center portion is raised from the edge portion, so that mud and the like hardly accumulate on the seal portion 51c and fall down. Therefore, the operation of the operation lever 18 pushes the seal portion 51c. Even if it is expanded, mud or the like does not enter the lever stand 19 which is a casing of the operation lever 18, and erroneous operation can be prevented.
In addition, the present sealing member 51 can be applied not only to the operation lever 18 provided on the lever stand 19 but also to an operation lever provided on other parts.

[0024]

As described above, the present invention has the following remarkable effects. As described in claim 1,
Since the footrest projecting from the step from the front end of the step to the left and right front corners is integrally formed, and the height of the footrest gradually decreases as going backward from the left and right front corners of the step. Thus, the number of parts in the steps can be reduced, and the assembling work can be simplified. Further, if the operator can put his foot on the footrest and step on it, and put his foot on an inclined surface configured so that its height gradually decreases as it goes backward from the left and right front corners, the ankle can be lifted. It is possible to step on the foot in a natural posture such as the angle of the vehicle, and it is possible to reduce fatigue during driving operation.

Further, since the upper edge of the footrest is angled as described in the second aspect, when the foot is put on the upper surface of the footrest, the edge is caught on the sole and the foot does not slip. You can step firmly.

Further, according to the present invention, a projection is formed behind the footrest at the left and right ends of the step, and the height of the footrest is formed higher than the height of the projection. The step with the upper surface of the footrest is increased, and the footrest can be effectively depressed.

Further, as described in claim 4, the sealing member for sealing between the operating lever projecting from the inside of the casing to the outside and the casing is formed in a shape in which the central portion is higher than the edge portion. The degree of deformation can be reduced by suppressing the bending angle of the seal member due to the operation of the operation lever, and the force applied to the bent portion of the seal member can be reduced, thereby preventing the occurrence of cracks and cracks. In addition, since mud and the like hardly accumulate on the seal member and fall down, even if the seal member is pushed out by the operation of the operation lever, the mud or the like does not enter the casing of the operation lever, and erroneous operation. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing a turning work vehicle according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a plan view showing steps.

FIG. 5 is a side view of the same.

FIG. 6 is a front view of the same.

FIG. 7 is a sectional view taken along line AA in FIG. 4;

FIG. 8 is a sectional view taken along line BB in FIG. 4;

FIG. 9 is a view showing a state where a foot is put on an inclined surface of a footrest.

FIG. 10 is a side view showing an operation lever provided on a lever stand.

FIG. 11 is a plan view showing a seal member.

FIG. 12 is a side sectional view of the same.

FIG. 13 is a front sectional view of the same.

FIG. 14 is a plan view showing a conventional seal member.

FIG. 15 is a front sectional view showing a conventional sealing member.

[Explanation of symbols]

 18 Operation lever 20 Step 31 Footrest 31a Inclined surface 31c Edge 32 Projection 51 Seal member

Claims (4)

[Claims] 1. A boom rotatably mounted on a revolving structure that is configured to be rotatable, an arm rotatably mounted on the boom, and a work attachment rotatably mounted on the arm. In a turning work vehicle equipped with a working machine having a step, a footrest protruding from the step is integrally formed from the front end of the step to the left and right front corners, and the footrest moves rearward from the left and right front corners of the step. A turning work vehicle, the height of which is gradually reduced. 2. The turning work vehicle according to claim 1, wherein an upper edge of the footrest is angular. 3. The turning work according to claim 1, wherein a protrusion is formed behind the footrest at the left and right ends of the step, and the height of the footrest is formed higher than the height of the protrusion. car. 4. A boom rotatably mounted on a revolving structure that is configured to be rotatable, an arm rotatably mounted on the boom, and a work attachment rotatably mounted on the arm. In a turning work vehicle provided with a working machine having a working machine, a sealing member for sealing a gap between an operation lever projecting from the inside of the casing to the outside and the casing is formed in a shape in which a central portion is raised from an edge. And turning work vehicle.