JPH11229434A - Revolving construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the total length of a revolving frame and reduce the total revolving radius and enable an operator to revolve the upper revolving body at ease. SOLUTION: A cab 32, a cover 39, a counterweight 40, etc., are fitted to a revolving frame 23 of the upper revolving body 21. The counterweight 40 is formed by casting. The distance from the revolving center 0 to the corner 32B of the cab 32 is made nearly equal to the distance from the revolving center 0 to the rear face side of the counterweight 40. A handle 37 projecting to the outside of the revolving radius is attached at the corner 32B of the cab 32, and the rear face side of the counterweight 40 is arranged within an imaginary circle 22 with a radius R3 decided by the handle 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type construction machine such as a hydraulic shovel which is suitably used for excavating earth and sand, for example, and more particularly, to a swing type in which the swing radius of an upper swing body is reduced. Related to construction machinery.

[0002]

2. Description of the Related Art Generally, a revolving construction machine is provided with an upper revolving structure rotatably provided on a lower traveling structure, and a working device such as a shovel or a crane is mounted on the upper revolving structure to operate by a driver (operator). Excavation work and load lifting work are performed by this. In this case, the upper revolving structure is provided with a driver's building structure (hereinafter, referred to as a "cab") called a cab, a cabin, a driver's cab, and the like including a control device, an operation lever, a driver's seat, and the like.

Therefore, a hydraulic shovel will be described as an example of a conventional swing type construction machine with reference to FIG.

In FIG. 1, reference numeral 1 denotes a lower traveling body of a hydraulic shovel. The lower traveling body 1 has crawler belts 1A and 1B located on both left and right sides and extending forward and backward.

[0005] Reference numeral 2 denotes an upper revolving structure mounted on the lower traveling structure 1 so as to be capable of revolving. The upper revolving structure 2 is provided on a cab 4 provided on a revolving frame 3 and on the rear side of the cab 4. And a count weight 6 disposed on the rear side of the building cover 5.

A swing device (not shown) including a swing motor or the like as a hydraulic actuator is provided between the swing frame 3 of the upper swing body 2 and the lower traveling body 1.
This turning device is configured to drive the upper turning body 2 to turn around the turning center O. The building cover 5 accommodates a prime mover, a hydraulic motor, and the like (both not shown) serving as a power source of a turning motor and the like.

Here, the cab 4 is disposed on the left side in front of the revolving frame 3, and the cab 4 has a front left corner 4 A with respect to the revolving center O during the revolving operation of the upper revolving unit 2. It is turned along a virtual circle 7 having a radius R1. The counterweight 6 has a radius R2 (R2>) with respect to the turning center O.
R1) is curved in an arc shape so as to be contained in the virtual circle 8 of FIG.

Reference numeral 9 denotes a working device which is disposed at the front of the revolving frame 3 so as to be able to move up and down. The working device 9 comprises a boom 10, an arm and a bucket (both not shown), and the like. The excavation work such as earth and sand is performed by extending and contracting an arm cylinder and a bucket cylinder (neither is shown). The boom 10 and the like of the working device 9 are arranged at positions offset by a certain distance from a center line O1 -O1 passing through the turning center O in order to satisfy the standard size of the cab 4.

In the prior art hydraulic shovel configured as described above, the upper revolving unit 2 is pivoted on the lower traveling unit 1 by tilting an operation lever or the like provided in the cab 4, and the working device is operated. Excavation work such as earth and sand is performed by raising and lowering 9. Then, at the time of the turning operation of the upper turning body 2, the corner 4A of the cab 4 is turned along the virtual circle 7 having the radius R1 with respect to the turning center O.

The counterweight 6 is turned along the virtual circle 8 having a radius R2 with respect to the turning center O, and
Of the virtual circle 7 is larger than the radius R1 of the virtual circle 7 by the dimension ΔR1. Therefore, when the upper swing body 2 is swung at a work site or the like, the upper swing body 2 is swiveled after confirming that no obstacle exists in the virtual circle 8 having the radius R2. I try to ensure the safety of.

[0011]

By the way, in the above-mentioned hydraulic shovel according to the prior art, when the upper swing body 2 is swung, an obstacle is formed within an imaginary circle 8 having a radius R2 determined by the rear side of the counterweight 6. It is necessary to confirm that the upper revolving unit 2 does not exist, and there is a problem that it is difficult to perform the revolving operation of the upper revolving unit 2 in a narrow work site or the like.

Therefore, the present inventors have studied to reduce the radius R2 from the turning center O to the rear surface side of the counterweight 6 to, for example, about the radius R1 on the cab 4 side.
Then, in this case, it is determined whether or not the upper revolving unit 2 can perform the turning operation only by confirming that the corner 4A, which can sufficiently secure the field of view in front of the cab 4, does not interfere with the surrounding obstacles. Therefore, there is an advantage that work safety can be easily secured.

However, also in this case, the radius from the turning center O to the corner 4A of the cab 4 and the radius from the rear surface side of the counterweight 6 are not necessarily limited due to manufacturing tolerances of the cab 4 and the counterweight 6. Often do not match.

Therefore, when the radius of the counterweight 6 to the rear side is longer than the radius of the cab 4 to the corner 4A, the driver may check whether the corner 4A of the cab 4 interferes with the surrounding obstacle. Even if the upper revolving structure 2 is turned while observing whether or not it is visible, the rear side of the counterweight 6 may come into contact with an obstacle, and the driver must turn the upper revolving structure 2 with anxiety. There's a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can reduce the entire length of a turning frame to reduce the entire turning radius, and allows the driver to turn the upper turning body with a sense of security. There is a need to provide a swivel type construction machine that can be operated.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a lower traveling body having crawler belts located on both left and right sides and extending forward and backward, and turning on the lower traveling body. An upper revolving body mounted so as to be capable of moving, and a working device provided on the front of the upper revolving body so as to be able to move up and down. A revolving frame to be driven, a cab located on one of the left and right sides located on the front side of the revolving frame, a building cover provided on the rear side of the cab and containing a power source, and the building cover And a counterweight provided on the outer peripheral side of the rear part.

The feature of the structure adopted in the first aspect of the present invention is that the rear surface side of the counterweight is set within the turning radius of the upper revolving unit with respect to the cab, and the cab has the counterweight of the counterweight. In order to supplement the dimensional tolerance, a projecting portion projecting outside the turning radius is provided.

With this configuration, the dimensional tolerance of the counterweight can be compensated for by the protrusion, and the driver only needs to confirm whether or not the protrusion interferes with the surrounding obstacles. It can be confirmed that the body does not touch the obstacle.

Further, the invention according to claim 2 is that the projection is projected from the cab with a margin of a handful of hand in addition to the dimensional tolerance.

In this case, the upper turning body can be turned with a margin of a handful of hands, and the driver can turn the upper turning body with a sense of security.

The invention according to claim 3 is that the counterweight is formed by casting.

With such a configuration, the weight of the counterweight can be increased. In addition, the handle can compensate for dimensional tolerance due to heat shrinkage generated during casting of the counterweight.

According to a fourth aspect of the present invention, the projecting portion is provided within a range of a front view which can be seen when operating the working device.

Thus, when operating the working device in the cab, the driver can turn the upper swing body to visually check whether or not the protrusion interferes with an obstacle.

According to a fifth aspect of the present invention, the projection is provided at a corner located at the front side of the cab.

Thus, when the driver operates the working device in the cab, the driver can easily see the protrusions provided at the corners.

Further, the invention according to claim 6 is characterized in that the protruding portion is constituted by a handle gripped when getting on and off the cab.

In this case, the handle gripped when getting on and off the cab can be used as a mark for confirming that the upper revolving structure does not interfere with the obstacle, and it is confirmed whether or not the gripper interferes with the obstacle. It is not necessary to separately provide a member used only for this purpose.

Furthermore, the invention of claim 7 resides in that the handle is detachably provided on the cab by a fastening member.

Thus, even if the handle accidentally comes into contact with a surrounding obstacle, the handle can be easily replaced.

[0031]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a swing type construction machine according to an embodiment of the present invention. In the embodiment, the same components as those of the above-described conventional technology are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 21 denotes an upper revolving structure employed in the present embodiment. The upper revolving structure 21 is similar to the upper revolving structure 2 described in the prior art, and includes a revolving frame 23 and a cab 3 which will be described later.
2. It has a structure having a building cover 39 and a counterweight 40.

However, in the present embodiment, the entire length of the revolving frame 23 is shortened, and accordingly, the shape and arrangement of the building cover 39 are changed as shown in FIG. The upper revolving superstructure 21 is housed in an imaginary circle 22 having a radius R3 as a turning radius of the cab 32, the building cover 39, the counterweight 40 and the like. FIG.
When the boom 10 is raised and lowered, and the arm and the bucket are turned so as to be folded, the working device 9 is also accommodated in an imaginary circle 22 having a radius R3 as shown in FIG.

Further, the radius R3 is set to a value smaller than a half (L1 / 2) of the dimension L1 which is the total length in the front and rear directions of the lower traveling structure 1.
The rear end is formed so as not to protrude forward and rearward from the lower traveling body 1. Further, the radius R3 is set to a value larger than a half (L2 / 2) of the dimension L2 which is the full width of the lower traveling body 1 in the left and right directions.
The front end and rear end of the vehicle 1 project leftward and rightward of the undercarriage 1 when turning left and right of the undercarriage 1, respectively.

Reference numeral 23 denotes a revolving frame provided on the lower traveling unit 1, and the revolving frame 23 is a revolving device (not shown).
Can be turned. As shown in FIG. 3, the revolving frame 23 includes a center frame 24 and a projecting beam 2 projecting left and right from the center frame 24.
5, 26, 27, 28 and the overhang beams 25, 26, 2
The left side frame 29 joined to the front end side of the left overhanging beams 25 and 26 of the left and right sides 7 and 28 and extending forward and backward.
And are joined to the tip side of the right overhang beams 27, 28,
The right and left side frames 30 extend substantially in the front and rear directions.
It is formed of a high-strength pipe material having a letter shape.

The front side of the center frame 24 is a bracket for the boom 10, and the rear side of the center frame 24 is joined to the upper surface of a tail plate 31. Frame 2
9, 30 are joined to the rear side.

A cab 32, which will be described later, is disposed on the upper surfaces of the overhanging beams 25 and 26, the side frames 29, and the like, as indicated by phantom lines in FIG. Further, a counter weight 40 described later is provided on the rear side of the center frame 24.

Reference numeral 32 denotes a cab provided on the front left side of the revolving frame 23. A front glass 32A is disposed on the front side of the cab 32, and a driver enters the cab 32 on the left side of the cab 32. A door 33 for getting on and off is mounted so that it can be opened and closed. A driver's seat 34 which is seated when the driver operates the working device 9 or the like is provided in the cab 32, and an operation lever (not shown) or the like is tilted while sitting on the driver's seat 34. By doing so, the driver causes the upper swing body 21 to perform a swiveling operation and the working device 9 to elevate.

When the upper revolving superstructure 21 is pivoted, the cab 32 is moved to the front left corner 32 as shown in FIG.
B is turned with respect to the turning center O along a virtual circle 35 having a radius R4, and the counterweight 40 is turned with respect to the turning center O along a virtual circle 36 having a radius R5. The radius R4 up to the corner 32B of the cab 32 and the radius R5 up to the rear side of the counterweight 40 are formed to have substantially the same dimensions. The radius R4 has almost the same size as the radius R1 described in the prior art. Here, the radius R4 is determined by the dimensional tolerance due to the casting of the counterweight 40, the cab 32, and the counterweight 40.
For example, the radius R5
寸 法 R2.

Reference numeral 37 denotes a handle located on the front left side of the cab 32 and attached to the corner 32B. The handle 37 is gripped when getting into and out of the cab 32. For this reason, the handle 37 is disposed near the door 33, and the corner 32B of the cab 32 is provided.
Along the top and bottom.

The handle 37 extends toward the front side of the cab 32, and protrudes outward from the turning radius by a protrusion size ΔR3 larger than the size ΔR2 due to a dimensional tolerance of the counterweight 40 or the like. The middle of the handle 37 extending upward and downward becomes a front end 37A.
A is the outermost circumference side of the turning radius. For this reason, the distance from the turning center O to the front end 37A of the handle 37 becomes the radius R3 as the turning radius, and the handle 37 supplements the dimension ΔR2 as the dimensional tolerance of the counterweight 40, etc.
This determines the turning radius.

The protrusion dimension ΔR 3 of the handle 37 is determined by the dimensional tolerance due to the casting of the counterweight 40 and the cab 3.
2. Determined based on the dimension ΔR2 (for example, about 20 to 30 mm) when the dimensional tolerance when the counterweight 40 is assembled to the revolving frame 23 is maximized.

The protrusion dimension ΔR3 of the handle 37 is set as shown in the following equation 1 by adding a margin α for a handful of hands to the dimension ΔR2 due to dimensional tolerance or the like.

[0044]

## EQU1 ## ΔR3 = ΔR2 + α

Here, the allowance α is, for example, 40 to 100 m.
m, preferably about 60 to 90 mm.
For this reason, the protrusion dimension ΔR3 is, for example, 60 to 130 mm,
Preferably, it is about 80 to 120 mm.

As shown in FIG. 5, the handle 37 is formed in a rod shape from a metal material or a resin material, and both ends of the handle 37 can be detached above and below the cab 32 by bolts 38, 38 as fastening members. It is fastened to. The handle 37 extends toward the front side of the cab 32, and the front end 37 </ b> A is provided within a range of a front view that can be seen when the driver operates the working device 9. For this reason, the driver sits on the driver's seat 34 in the cab 32 and passes the front end 3 of the handle 37 through the front glass 32A.
7A can be visually observed.

Reference numeral 39 denotes a building cover provided on the rear side of the cab 32. In the building cover 39, a prime mover as a power source, a radiator, a hydraulic pump and the like (all not shown) are arranged. The hydraulic pump is driven by a prime mover and supplies pressure oil to a swing motor (not shown), the boom cylinder 11, and the like. The prime mover may be arranged between the building cover 39 and the cab 32 or below the cab 32.

Numeral 40 denotes a counterweight disposed on the outer peripheral side of the rear part of the building cover. The counterweight 40 is formed by casting to increase its weight, and has a radius R5.
Are formed in a circular arc along the virtual circle 36 of FIG. The counter weight 40 is connected to the turning frame 23.
Is fixed to the rear side by bolts or the like.

The hydraulic excavator according to the present embodiment has the above-described configuration, and its operation will be described next.

First, the lower traveling body 1 is moved to a work site for excavating earth and sand. Next, the driver pivots the operation lever or the like provided in the cab 32 to rotate the upper revolving unit 21 on the lower traveling unit 1 and to raise and lower the working device 9 to remove soil and the like. Perform excavation work.

Here, the radius R3 required when the upper revolving superstructure 21 turns is a half of the total length of the lower traveling superstructure 1 (L
２), the cab 32 of the upper rotating body 21
Also, the counterweight 40 does not protrude in the front and rear directions of the undercarriage 1. For this reason, when working in front and rear directions of the undercarriage 1, the cab 32, the counterweight 40, and the like do not come into contact with the obstacle, and the counterweight 40, etc., which is difficult for the driver to see, comes into contact with the obstacle. You don't have to worry about it.

On the other hand, when the upper slewing body 21 is swiveled to move the cab 32 leftward and rightward of the lower traveling body 1, the upper slewing body 21 moves along the imaginary circle 22 in FIG. Project to the left and right. At this time, the handle 37 is attached to a position visible from the driver's seat, and the front end 37A of the handle 37 is configured to move along the imaginary circle 22. The cab 32 is turned to check whether or not the front end 37A of the handle 37 interferes with a surrounding obstacle. Thereby, it can be easily confirmed that the upper swing body 21 does not contact an obstacle, and the swing operation of the upper swing body 21 can be continued with confidence.

In particular, in the hydraulic shovel according to the present embodiment, the upper revolving superstructure 21 is set so that the radius R4 up to the corner 32B of the cab 32 and the radius R5 up to the rear side of the counterweight 40 are substantially equal. Since it is formed, a handle 37 serving as a mark for confirming whether or not it interferes with an obstacle can be provided near the corner 32B of the cab 32.

Also, in the hydraulic excavator according to the present embodiment, since the upper revolving unit 21 is formed so that the radius R3 is larger than a half (L2 / 2) of the dimension L2, the radius R3 is set to the dimension L2. A larger working device 9 can be attached, the capacity of the bucket can be increased, and the efficiency of excavation work can be increased, as compared with the case where the value is set to a value substantially equal to half the dimension (L2 / 2).

On the other hand, in the hydraulic excavator according to the present embodiment, the weight of the upper revolving unit 21 is increased and the weight of the upper revolving unit 21 is increased as compared with the case where the radius R3 is set to a value substantially equal to half the dimension L2 (L2 / 2). During the turning operation, the upper swing body 21 projects leftward and rightward of the lower traveling body 1. For this reason, the upper revolving superstructure 21 tends to interfere with surrounding obstacles, and the damage when contacting the obstacles tends to increase.

However, the driver does not need to handle the front end 37A of the handle 37.
You only have to check once to see if it interferes with obstacles,
This makes it possible to easily eliminate anxiety about whether the counterweight 40 or the like, which is difficult to see, comes into contact with an obstacle.

Further, since the counterweight 40 is formed by casting, a dimensional tolerance of, for example, about 10 to 30 mm may occur with respect to a design value due to heat shrinkage due to casting. Therefore, the radius R5 up to the rear side of the counterweight 40 may be larger than the radius R4 up to the corner 32B of the cab 32.

However, since the protrusion dimension .DELTA.R3 of the handle 37 is determined based on the dimensional tolerance due to the casting, the handle 37 reliably compensates for the dimension .DELTA.R2 as the dimensional tolerance of the counterweight 40 and the like. Part 37A
The turning radius can be determined by the distance from the turning center O to the turning center O.

Thus, according to the present embodiment, the counterweight 40 is accommodated within the radius R3 which is the turning radius of the upper turning body 21, and the handle 37 protruding outward from the turning radius is attached to the cab 32. Therefore, the handle 37
Thus, the dimensional tolerance of the counterweight 40 can be compensated, and the upper revolving superstructure 21 can be accommodated in the imaginary circle 22 having the radius R3 determined by the handle 37.

Therefore, the driver can easily confirm whether or not the counterweight 40 or the like contacts the obstacle by checking whether or not the handle 37 interferes with the surrounding obstacle. Contact with an obstacle can be prevented. As a result, the driver's anxiety can be eliminated even at a demolition site, a narrow work site such as a mountain, and the excavation work can be smoothly performed.

Further, since the protrusion dimension ΔR3 of the handle 37 is set by adding a margin α for one handful, the upper swing body 21 can be rotated with a margin of the margin α, so that the driver can feel more secure. The upper swing body 21 can be swiveled.

Further, since the counterweight 40 is formed by casting, the weight of the counterweight 40 can be increased, the radius R5 to the rear side of the counterweight 40 can be reduced, and the counterweight 40 can be provided by the handle 37. The dimensional tolerance due to the casting of No. 40 can be compensated. Therefore, the front end 37A of the handle 37 can reach the imaginary circle 22 having the radius R3.
The counterweight 40 can be reliably accommodated in the virtual circle 22. Then, the driver operates the front end 37A of the handle 37.
It is possible to confirm whether or not the counterweight 40 comes into contact with an obstacle simply by checking whether or not the counterweight 40 interferes with the surrounding obstacle.

Since the front end 37A of the handle 37 is provided within the range of the driver's front view when operating the working device 9, the driver can operate the operating lever or the like while sitting on the driver's seat 34 in the cab 32. By operating the upper revolving unit 21 slowly, it is possible to easily visually confirm whether the front end 37A of the handle 37 interferes with an obstacle.

The handle 37 is connected to the corner 32 of the cab 32.
B, the driver can use the driver's seat 34 in the cab 32.
The front end 37 of the handle 37 can be easily
A can be seen.

Further, since the contact with the surrounding obstacle is confirmed by the handle 37, it is not necessary to separately provide another member used only for confirming the contact with the obstacle, and the manufacturing cost of the hydraulic excavator can be reduced. can do. Further, since the handle 37 can be formed by a member having a lower strength than the cab 32, the handle 3 may be erroneously attached to an obstacle.
Even when the handle 7 comes into contact, the handle 37 is only slightly deformed, so that it is possible to prevent the obstacle and the cab 32 from being seriously damaged.

Further, since the handle 37 is fastened to the cab 32 by the bolt 38, when checking the contact with the obstacle, if the handle 37 contacts the obstacle by mistake and the handle 37 is deformed, By loosening the bolt 38, the handle 37 can be easily replaced, and the economic loss can be minimized.

In the above-described embodiment, the handle 37 is used as the protruding portion. However, the present invention is not limited to this, and a protrusion made of a soft resin material or the like may be used. Like the 37, it may be attached to the corner 32B of the cab 32.

In the above-described embodiment, the handle 37 is attached to the cab 32 by the bolt 38. However, for example, a protrusion made of a soft resin material may be bonded to the cab.

In the above embodiment, the cab 32 is provided on the front left side of the turning frame 23. However, the cab 32 may be provided on the front right side of the turning frame 23.

In the above embodiment, the counterweight 40 is formed by casting. However, the present invention is not limited to this, and a box body formed by welding a thick plate of iron or the like is formed.
The counterweight may be formed by filling the box with iron scraps, concrete, or the like.

Further, in the above-described embodiment, the excavator has been described as an example. However, the present invention is not limited to this. For example, the present invention is applied to a revolving construction machine having an upper revolving unit such as a self-propelled crane. It may be applied.

[0072]

As described above in detail, according to the first aspect of the present invention, the counterweight is accommodated within the turning radius of the upper turning body, and the cab has the protruding portion projecting outwardly of the turning radius. Is provided, the dimensional tolerance of the counterweight can be compensated for by the protrusion, and the upper revolving unit can be accommodated within the turning radius determined by the protrusion.

Therefore, the driver can easily confirm whether the counterweight or the like comes into contact with the obstacle by checking whether or not the protrusion interferes with the surrounding obstacle. Contact with an object can be prevented, and anxiety of the driver can be eliminated, and digging work and the like can be performed smoothly.

According to the second aspect of the present invention, since the handle is protruded with a margin of a handful, the upper swing body can be turned with a margin of a handful, so that the driver can feel more secure. The upper revolving superstructure can be turned.

According to the third aspect of the present invention, since the counterweight is formed by casting, the weight of the counterweight can be increased, and the distance from the center of rotation to the rear side of the counterweight can be reduced. In addition, the handle can compensate for the dimensional tolerance due to the casting of the counterweight. For this reason, since the counterweight can be reliably contained within the virtual circle determined by the handle, the driver simply checks whether or not the handle interferes with the surrounding obstacle, and the driver can move the counterweight to the obstacle. It can be easily confirmed whether or not the contact occurs.

According to the fourth aspect of the present invention, since the projecting portion is provided within the range of the front view that can be seen when operating the working device, the driver operates the cab when operating the working device. By tilting the lever or the like and slowly rotating the upper rotating body, it can be easily visually confirmed whether or not the projecting portion interferes with an obstacle.

According to the fifth aspect of the present invention, since the protruding portions are provided at the corners of the cab, the driver can easily view the front end of the handle when operating the working device in the cab. Can be.

According to the sixth aspect of the present invention, since the protruding portion is formed by the handle, the contact with the surrounding obstacle can be confirmed by the handle, and the other portion is used only for confirming the contact with the obstacle. There is no need to separately provide a member, and the manufacturing cost of the revolving construction machine can be reduced. Furthermore, since the handle can be formed by a member having a lower strength than the cab, even when the handle accidentally contacts an obstacle,
Even if the handle is slightly deformed, it is possible to prevent the obstacle and the cab from being seriously damaged.

Further, according to the invention of claim 7, since the handle is detachably provided on the cab by the fastening member, when the contact with the obstacle is confirmed, the handle erroneously comes into contact with the obstacle. When the handle is deformed, the handle can be easily removed and replaced, thereby minimizing economic loss.

[Brief description of the drawings]

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

FIG. 2 is an enlarged plan view showing an upper swing body and the like of a hydraulic shovel.

FIG. 3 is an enlarged plan view showing a revolving frame.

FIG. 4 is an enlarged plan view showing a cab and the like.

FIG. 5 is an enlarged front view showing a cab and the like.

FIG. 6 is a plan view showing a conventional hydraulic excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 9 Working device 21 Upper revolving superstructure 23 Revolving frame 37 Handle 38 Bolt (fastening member) 39 Building cover 40 Counter weight R3 Radius (Rotating radius) ΔR2 Dimensional tolerance ΔR3 Projection dimension O Rotating center

Claims (7)

[Claims] 1. An undercarriage having crawler belts located on both left and right sides and extending forward and backward, an upper revolving body pivotally mounted on the undercarriage, and a front of the upper revolving body. A working device provided to be capable of raising and lowering the part, wherein the upper revolving unit is provided on the lower traveling unit and is revolved and driven by a revolving device, and is located on the front side of the revolving frame. A cab provided on one of the left and right sides,
In a revolving construction machine comprising a building cover provided on the rear side of the cab and accommodating a power source and a counterweight provided on a rear outer peripheral side of the building cover, the rear side of the counterweight is based on the cab. Wherein the cab is provided with a protruding portion projecting outward from the turning radius in order to supplement a dimensional tolerance of the counterweight. machine. 2. The swiveling construction machine according to claim 1, wherein the projecting portion projects from the cab with a margin of a handful of hand in addition to the dimensional tolerance. 3. The swiveling construction according to claim 1, wherein the counterweight is formed by casting. 4. The revolving construction machine according to claim 1, wherein said projecting portion is provided within a range of a front view which is visible when operating said working device. 5. The revolving construction machine according to claim 1, wherein said projecting portion is provided at a corner located at a front side of said cab. 6. The projection according to claim 1, wherein the projection is formed by a handle gripped when getting on and off the cab.
The swiveling construction machine according to 4 or 5. 7. The swiveling construction machine according to claim 6, wherein the handle is detachably provided on the cab by a fastening member.