JP2004197550A - Working vehicle - Google Patents

Working vehicle Download PDF

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Publication number
JP2004197550A
JP2004197550A JP2003142647A JP2003142647A JP2004197550A JP 2004197550 A JP2004197550 A JP 2004197550A JP 2003142647 A JP2003142647 A JP 2003142647A JP 2003142647 A JP2003142647 A JP 2003142647A JP 2004197550 A JP2004197550 A JP 2004197550A
Authority
JP
Japan
Prior art keywords
canopy
counterweight
mounting
spacer
work vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003142647A
Other languages
Japanese (ja)
Inventor
Toshibumi Ogiwara
Katsumi Yokoo
勝実 横尾
俊文 荻原
Original Assignee
Komatsu Ltd
Komatsu Zenoah Co
小松ゼノア株式会社
株式会社小松製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2002308639 priority Critical
Application filed by Komatsu Ltd, Komatsu Zenoah Co, 小松ゼノア株式会社, 株式会社小松製作所 filed Critical Komatsu Ltd
Priority to JP2003142647A priority patent/JP2004197550A/en
Priority claimed from US10/689,997 external-priority patent/US7131687B2/en
Publication of JP2004197550A publication Critical patent/JP2004197550A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle, including ROPS canopy simple in structure and reducing the manufacturing cost, improved in maintainability, and attaining favorable rear visual field of an operator. <P>SOLUTION: A cast counterweight 1 is provided with an outer surface formed like a circular arc. In the counterweight 1, an extension part extending to the right and left like a circular arc is formed on the lower part, a lower mounting seating is disposed under the tip of the extension part and the central part of the counterweight. This working vehicle includes: the counterweight 1 provided with a canopy mounting seating on the top face of the counterweight; and the canopy 2 having a roof part 22, a straight support 21 erected on the right and left to support the roof part and a cast lower mounting member 23 to which the lower end part of the support is secured. The canopy 2 is placed on the counterweight 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work vehicle.
[0002]
[Prior art]
FIG. 9 shows an example of a small excavation work vehicle frequently used in urban civil engineering and the like. The small excavation work vehicle has a canopy 200 at the same time as disposing a counterweight 100 for balancing the vehicle against the load applied to the work device on the side opposite to the mounting position of the work device 90. However, in recent years, as the demand for improved safety has increased, in order to ensure the safety of the operator when the vehicle falls, a driver protection structure that meets the strength standard defined by the ISO standard or the like, that is, ROPS (Roll-over Protective Structure). ) Is increasingly required.
[0003]
FIG. 10 is an exploded perspective view showing an example of a conventional ROPS canopy mounted on a small excavator. As shown in FIG. 10, a ROPS canopy is formed by attaching a ROPS canopy support member 110 having a sheet metal structure to a frame 150 and mounting a canopy 210 having a sheet metal structure on the ROPS canopy support member 110 to have a specified strength. (For example, see Non-Patent Document 1).
[0004]
Also, for example, as shown in FIG. 11, the counter weight 120 is extended upward,
There is also known a configuration in which a support member 221 for supporting the canopy 220 is provided on the upper end side of the counterweight 120 to support the canopy 220 (for example, see Patent Document 1).
[0005]
[Non-patent document 1]
"Bobcat, Model56 Hydraulic Excavator Parts Manual" Melroe Company
Nov. 1986, p. A3
[Patent Document 1]
JP-A-10-140607 (pages 2-5, FIG. 1-6)
[Problems to be solved by the invention]
However, the conventional ROPS canopy support member 110 as shown in FIG.
Because of the sheet metal configuration, the structure supporting the ROPS canopy 210 has a problem that the structure is complicated and the weight is increased in order to secure a specified strength. is there.
[0006]
Further, an engine (not shown) is provided at a rear portion of the ROPS canopy support member 110 shown in FIG. 10, and the ROPS canopy support member 110 obstructs work for performing inspection and maintenance of the engine. And there is a problem with the maintainability of the engine.
[0007]
Further, in the counterweight 120 as shown in FIG. 11, since the counterweight 120 is extended upward, the center of gravity of the counterweight 120 can be moved toward the rear end side, and the stability during operation is improved. However, since the counterweight supporting the ROPS canopy is not a structure that satisfies the specified strength, the canopy 220 cannot form the ROPS canopy.
[0008]
In addition, the two support members 220a of the canopy 220 are narrowly erected behind the operation sheet S (see Patent Literature 1). The two support members 220a are located, and the rear view is not always good.
[0009]
Further, Patent Literature 1 exemplifies a case in which one thick support member 220a is provided as a second embodiment. However, since the support member is located right behind the seat position of the worker, the rear view of the worker is visible. The support member 220a is located at the center of the field of view, and blocks the center of the field of view.
[0010]
Therefore, further improvement in the rear view of the worker is desired.
[0011]
The present invention has been made in view of the problems of the conventional structure described above, and has a ROPS canopy that has a simple structure and can reduce manufacturing cost, improves maintainability, and improves the rear view of an operator. It is intended to provide an improved work vehicle.
[0012]
Means for Solving the Problems, Functions and Effects
In order to achieve the above object, a first invention according to the present invention is a cast counterweight having an outer surface formed in a substantially arc shape, wherein the counterweight has a lower portion and a lower portion. An extension portion extending in a substantially arc shape is formed, and a lower mounting seat is provided at a tip of the extension portion and a lower portion of a center portion of the counter weight, and a canopy mounting seat is provided on an upper surface of the counter weight. Counter weight and
A canopy having a roof portion, a straight post that stands upright on the left and right supporting the roof portion, and a cast lower mounting member that fixes a lower end portion of the post,
The canopy is placed on the counterweight.
[0013]
According to the first invention, there is provided a cast counterweight having an outer surface formed in a substantially arc shape, wherein the counterweight forms an extended portion extending in a substantially arc shape to the left and right at a lower portion, and Since a lower mounting seat is provided at a tip of the extension portion and a lower portion of a center portion of the counter weight, the counter weight can be attached to the frame at three lower mounting seats separated in an arc shape. it can. As a result, the counterweight is firmly fixed against an external force, so that a specified strength required as a pedestal of the ROPS canopy attached to the upper surface of the counterweight can be secured. Also, since the right and left columns supporting the roof are straight, it is possible to use a high-strength material that is difficult to bend, and the lower mounting member for fixing the lower end of the column is made of casting. Therefore, the mounting portion of the column can be formed into a smooth shape that reduces stress concentration. Therefore, the specified strength required for the ROPS canopy can be easily obtained by this structure. Therefore, a two-post ROPS canopy having a superior front view compared to a four-post canopy can be formed in a lightweight and simple configuration. It can be manufactured with.
[0014]
According to a second aspect based on the first aspect, an inspection hole is provided in a central portion of the counterweight.
[0015]
According to the second aspect of the present invention, since the inspection hole is provided at the center of the counter weight, the oil level of the engine disposed in the engine room in front of the counter weight is checked, and the filter is replaced. Can be easily performed.
[0016]
A third invention is based on the first invention, wherein the canopy is mounted on the counterweight via a spacer having a taphole for mounting a canopy and a taphole for mounting to the counterweight. It is characterized by.
[0017]
According to the third invention, the canopy is placed on the counterweight via the spacer formed with the taphole for mounting the canopy and the taphole for mounting to the counterweight. By increasing the width of the spacer without increasing the width of the canopy mounting seat, the width of the contact portion of the canopy with the lower mounting member can be increased. As a result, it is possible to sufficiently secure the mounting strength of the canopy, and it is not necessary to increase the width of the canopy mounting seat on the upper surface of the counterweight, so that the space in the engine room is not narrowed.
[0018]
A fourth invention is based on the third invention, characterized in that floor spacers are provided at left and right ends of the spacer.
[0019]
According to the fourth aspect of the present invention, since the floor mounting portions are provided at the left and right ends of the spacer, by removing the bolts that are screwed into the mounting tap holes that mount the spacer on the counterweight, With the canopy integrally fixed, the tilt can be performed about the hinge pin of the tilt hinge provided at the front end of the floor. As a result, the space above the engine room is widely opened, so that inspection and maintenance work becomes very easy.
[0020]
The fifth invention includes a counterweight, a canopy installed on the counterweight and having two right and left columns for supporting a roof, and an operation seat on which an operator sits,
The two pillars in the canopy have an interval dimension larger than the width dimension of the operation sheet, and are located on the side of the operation sheet and in the sideways area or the rear area.
[0021]
According to the fifth aspect, since the two columns in the canopy have an interval dimension wider than the width dimension of the operation sheet, the strength of the columns against load against a lateral load is improved.
[0022]
Further, since the two pillars in the canopy are located on the side of the operation sheet and in the sideways area or the rear area, there is nothing obstructing the field of view in the center of the rear field of view of the operator, and the rear field visibility is good. .
[0023]
The sixth invention is based on the fifth invention,
An engine is provided below the operation seat.
[0024]
According to the sixth aspect, the engine is disposed below the operation seat, so that the operation seat can be disposed further rearward.
[0025]
Therefore, the operation space for the worker is expanded, the operability is improved, and the ease of getting on and off the vehicle body is good.
[0026]
A seventh invention is based on the fifth or sixth invention,
The canopy may include a lower attachment member extending below the two pillars toward the center of the vehicle body and attaching the canopy to the counterweight.
[0027]
According to the seventh aspect, since the lower mounting member of the canopy extends toward the center of the vehicle body, the canopy can be mounted at the center of the vehicle body, and the lower mounting member does not protrude outward from the vehicle body. This contributes to a more compact body.
[0028]
An eighth invention is based on the fifth or sixth invention,
The canopy includes a lower mounting member for connecting the two columns at a lower portion and attaching the canopy to the counterweight.
[0029]
According to the eighth aspect, since the canopy connects the two pillars to each other by the lower mounting member at the lower portion, the canopy forms a rigid structure having a rectangular shape, and the strength of load resistance against a lateral load increases. .
[0030]
A ninth invention is based on the seventh or eighth invention,
The lower mounting member of the canopy is made of casting or forging.
[0031]
According to the ninth aspect, when the lower mounting member of the canopy is made of a casting, it can be formed into a smooth shape that reduces stress concentration.
[0032]
Further, when the lower mounting member of the canopy is made of forging, the product strength is high because the forging line flows along the surface.
[0033]
Therefore, regardless of whether the lower mounting member of the canopy is made of casting or forging, the strength of the load resistance is increased, and the specified strength required for the ROPS canopy can be easily obtained.
[0034]
According to a tenth aspect of the present invention, there is provided a canopy having a counter weight, a roof portion supported by two right and left columns, and a lower mounting member below the two columns, and a lower mounting member for the counter weight and the canopy. And a spacer disposed between,
Attach the spacer to the floor with the operation sheet etc.,
Further, the spacer and the lower mounting member of the canopy are fastened by bolts, and the spacer and the counterweight are fastened by bolts.
[0035]
According to the tenth aspect, the floor can be tilted around the tilt hinge provided at the front end while being fixed integrally with the canopy.
[0036]
Therefore, since the space above the engine is widely opened, the inspection and maintenance work becomes very easy.
[0037]
In addition, since the counterweight and the canopy are connected via the spacer, when the cabin is mounted instead of the canopy, the cabin can be mounted on the floor by removing the spacer, and the degree of freedom in configuration is high. .
[0038]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a work vehicle according to the present invention will be described in detail with reference to the drawings.
[0039]
FIG. 1 shows a side view of the appearance of a small excavating vehicle, which is an example of a work vehicle according to the present invention. As shown in FIG. 1, a counterweight 1 is provided at a rear end of a frame (not shown), and the counterweight 1 is provided with a load applied to a working device 9 provided at a front end of the frame. Plays a balancing function.
[0040]
Further, an engine 36 is provided in front of the counterweight 1 and below an operation seat Os on which an operator sits.
[0041]
Therefore, it is possible to dispose the operation seat Os more rearward on the vehicle body, so that the operation space of the worker in front of the operation seat Os can be expanded, the operability is improved, and the operator's ease of getting on and off is improved. are doing.
[0042]
FIG. 3 is a perspective view showing the configuration of the counterweight 1 and the canopy 2 placed on the counterweight 1. The counterweight 1 is made of a casting and the outer surface thereof is formed in a substantially arc shape, and an extension 11 extending to the left and an extension 12 extending to the right in a substantially arc are formed at a lower portion. A left lower mounting seat 11a, a right lower mounting seat 12a, and a central lower mounting seat 13a are formed at the distal end portion of the extension portion 12 and the lower portion 13 at the central portion, respectively. The counter weight 1 is mounted on the lower mounting seat 11a, the lower mounting seat 12a, and the lower mounting seat 13a, which are provided at positions substantially arcuately separated from each other, by the bolt 14, the bolt 15, and the bolt 16 by the frame 5 (two-dot chain line). ), So that it can be firmly fixed to the frame 5. Thus, when the vehicle falls, the force applied to the counter weight 1 and the ROPS canopy 2 attached to the upper surface of the counter weight 1 can be sufficiently received.
[0043]
The canopy 2 has a plurality of bolts 28 formed in a plurality of bolt holes 17 formed in the upper surface 16 of the counterweight 1 shown in FIG. 4 and a bolt hole 23A of the lower mounting bracket 23 of the canopy 2 shown in FIG. It is attached to the upper surface of the counterweight 1 by being inserted and tightened by a nut (not shown). And since the lower mounting bracket 23 is made of casting, the respective mounting portions 24a and 24b of the left column 21a and the right column 21b supporting the roof 22 are formed into a smooth shape for reducing stress concentration. Since the struts 21a and the struts 21b use straight, thick pipes, the canopy 2 can sufficiently secure the prescribed strength required for the ROPS canopy.
[0044]
As shown in FIG. 7, the lower mounting bracket 23 is configured to extend toward the center of the vehicle body, is fitted and attached to the lower portions of the columns 21a and 21b, and has two columns 21a and 21b are mutually connected via the lower mounting bracket 23.
[0045]
The lower mounting bracket 23 for mounting the canopy to the counterweight 1 is configured to extend toward the center, so that the canopy 2 is mounted at the center of the vehicle body, and the mounting space for the canopy 2 protrudes outward. It is a compact body without doing.
[0046]
Further, since the two columns 21a and 21b of the canopy 2 are connected to each other at the lower portion via the lower mounting bracket 23, the canopy 2 forms a rigid structure having a rectangular shape, and the two columns 21a and 21b are Compared with the structure separated at the lower part, the structure has higher strength against a lateral load applied from the side of the canopy 2.
[0047]
In the present embodiment, the lower portions of the two columns 21a and 21b of the canopy 2 are connected via the lower mounting bracket 23, but may be separated without being connected.
[0048]
Furthermore, although the case where the lower mounting bracket 23 is made of casting is illustrated, forging is also possible. In this case, the product strength is higher than that of casting, because the forging wire flows along the surface. It has a function and effect.
[0049]
As described above, the roof 22 of the canopy 2 is supported by the two columns 21a and 21b. As shown in FIG. 2, the distance 211 between the two columns 21a and 21b is equal to the width of the operation sheet Os. It is set wider than b.
[0050]
As described above, since the interval dimension 21l between the columns 21a and 21b is wider than the width dimension b of the operation sheet Os, even when a lateral load is applied to the side portion of the canopy 2, it is located on the opposite side of the load point. To the supporting column (either of the columns 21a and 21b), the length of the moment due to the load applied to the supporting column increases, and the supporting column when a lateral load is applied is formed. The load due to the applied moment decreases.
[0051]
Therefore, by setting the interval 21l between the columns 21a and 21b to be wider than the width b of the opersheet Os, the canopy 2's bulging force against a lateral load increases, and the load-bearing strength of the canopy 2 increases.
[0052]
Further, as shown in FIGS. 1 and 2, the columns 21a and 21b of the canopy 2 are arranged in the rear area on the side of the operation sheet Os.
[0053]
As described above, the columns 21a and 21b are located in the rear area on the side of the operation sheet Os, and the inter-column dimension 211 is wider than the width dimension b of the operation sheet Os. Widely released, there is nothing to block the worker's rear view, and the rear view is good.
[0054]
Note that the columns 21a and 21b may be arranged on the side of the operation sheet Os and in the region just beside.
[0055]
Also in this case, similarly, the field of view immediately behind the worker is widely released, and there is nothing obstructing the worker's rear view, so that the rear visibility is good.
[0056]
Here, in order to determine the optimal positions of the columns 21a and 21b of the canopy 2, the vehicle body can be turned slightly backward, that is, the rear portion of the vehicle body does not protrude outward from the footwear r when the working device 9 turns. In addition, in order to expand the operation space of the operator, it is necessary to arrange the operation sheet Os further rearward.
[0057]
In addition, in order to be a better product, it is required that the strength of the canopy 2 be improved and that the visibility of the worker be good.
[0058]
The arrangement of the struts 21a and 21b described above provides an optimum position of the two struts that satisfies such conditions.
[0059]
In addition, as shown in FIG. 3, an inspection hole 18 is provided in the center of the counterweight 1. This facilitates operations such as checking the oil level of the engine 36 disposed in the engine room in front of the counterweight 1 and replacing the filter.
[0060]
Further, as shown in FIG. 5, the canopy 2 may be placed on the counterweight 1 via the spacer 3. That is, as shown in the partial cross-sectional view of FIG. 6, the spacer 3 is provided with a tap hole 31 for attaching a canopy and a tap hole 32 for attaching to a counterweight. The spacer 3 is attached to the counterweight 1 by a plurality of bolts 34. For this reason, the width of the abutment portion of the canopy 2 with the lower mounting bracket 23 can be increased by increasing the width of the spacer 3 without increasing the width of the canopy mounting seat 16 on the upper surface of the counterweight 1. It is possible to secure sufficient strength, and it is not necessary to increase the width of the canopy mounting seat 16 on the upper surface of the counterweight, so that the space 35 in the engine room is not narrowed.
[0061]
As shown in FIG. 5, the left and right ends of the spacer 3 are provided with a left-side mounting portion 3a and a right-side mounting portion 3b of the floor 4 to be described later.
[0062]
Then, as shown in FIG. 8, a floor 4 having an operation sheet Os and the like is attached to attachment portions 3a and 3b of the spacer 3 by bolts bf.
[0063]
With this configuration, the floor 4 is tilted by removing the bolts 34 that are screwed into the mounting tap holes 32 that mount the spacer 3 to the counterweight 1 in FIG. The tilt can be performed while being fixed integrally with the canopy 2 around the hinge pin 41 of the tilt hinge provided at the front end. As a result, the space above the engine 36 is widely opened, so that inspection and maintenance work becomes very easy.
[0064]
In addition, since the counterweight 1 and the canopy 2 are connected via the spacer 3, when a cabin (not shown) is mounted instead of the canopy 2, the spacer 3 is removed and the cabin is mounted on the floor 4. It is possible to flexibly cope with the configuration, and the configuration has a high degree of freedom.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of a work vehicle according to the present invention.
FIG. 2 is a front view of the work vehicle shown in FIG.
FIG. 3 is a perspective view showing a configuration of a counterweight and a canopy.
FIG. 4 is a perspective view of a counterweight.
FIG. 5 is a perspective view showing a configuration of a counterweight, a spacer, and a canopy.
FIG. 6 is a partial cross-sectional view showing a mounting portion for mounting a canopy on a counter weight via a spacer.
FIG. 7 is a perspective view of a canopy.
FIG. 8 is a diagram showing a state where the floor is tilted.
FIG. 9 is a side view showing an example of a work vehicle having a canopy.
FIG. 10 is an exploded view showing a configuration of a conventional ROPS canopy, a counter weight, and a frame.
FIG. 11 is a side view showing an example of a conventional work vehicle.
[Explanation of symbols]
1. . . Counter weight,
2. . . Canopy,
3. . . Spacer,
4. . . floor,
5. . . flame,
11a, 12a, 13a. . . Lower mounting seat,
18. . . Inspection holes,
21a, 21b. . . Props,
21l. . . Support spacing dimensions,
22. . . Roof (roof),
23. . . Lower mounting bracket (lower mounting member),
36. . . engine,
b. . . Width of the operation sheet,
Os. . . Op sheet.

Claims (10)

  1. A counterweight made of a casting having an outer surface formed in a substantially arc shape, wherein the counter weight forms an extension extending in a substantially arc shape to the left and right at a lower portion, and a tip end of the extension. At the lower part of the center of the counter weight, a lower mounting seat is provided, and on the upper surface of the counter weight, a counter weight provided with a canopy mounting seat,
    A canopy having a roof portion, a straight post that stands upright on the left and right supporting the roof portion, and a cast lower mounting member that fixes a lower end portion of the post,
    A work vehicle, wherein the canopy is mounted on the counterweight.
  2. The work vehicle according to claim 1, wherein an inspection hole is provided in a central portion of the counterweight.
  3. The work vehicle according to claim 1, wherein the canopy is mounted on the counterweight via a spacer formed with a taphole for mounting a canopy and a taphole for mounting to the counterweight.
  4. The work vehicle according to claim 3, wherein floor attachment portions are provided at left and right ends of the spacer.
  5. A counterweight, a canopy provided on the counterweight and having two left and right supports for supporting the roof, and an operation seat on which an operator sits,
    A work vehicle, wherein the two pillars in the canopy have an interval dimension wider than a width dimension of the operation sheet, and are located on a side of the operation sheet and in a region immediately beside or behind the operation sheet.
  6. The work vehicle according to claim 5, wherein an engine is provided below the operation seat.
  7. 6. The canopy according to claim 5, further comprising a lower attachment member extending below the two pillars toward the center of the vehicle body and attaching the canopy to the counterweight. 7. The work vehicle according to 6.
  8. The work according to claim 5 or 6, wherein the canopy comprises a lower mounting member for connecting the two struts together at a lower portion and for attaching the canopy to the counterweight. vehicle.
  9. The work vehicle according to claim 7, wherein the lower attachment member of the canopy is made of a casting or a forged product.
  10. A counterweight, a canopy having a roof portion supported by two right and left columns, and a lower mounting member below the two columns, and a canopy disposed between the counterweight and the lower mounting member of the canopy. With a spacer,
    Attach the spacer to the floor with the operation sheet etc.,
    A work vehicle, wherein the spacer and the lower mounting member of the canopy are fastened by bolts, and the spacer and the counterweight are fastened by bolts.
JP2003142647A 2002-10-23 2003-05-20 Working vehicle Pending JP2004197550A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2002308639 2002-10-23
JP2003142647A JP2004197550A (en) 2002-10-23 2003-05-20 Working vehicle

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2003142647A JP2004197550A (en) 2002-10-23 2003-05-20 Working vehicle
US10/689,997 US7131687B2 (en) 2002-10-23 2003-10-22 Work vehicle
EP20030023981 EP1413684A1 (en) 2002-10-23 2003-10-22 Work vehicle
KR20030073713A KR100592806B1 (en) 2002-10-23 2003-10-22 Work vehicle

Publications (1)

Publication Number Publication Date
JP2004197550A true JP2004197550A (en) 2004-07-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003142647A Pending JP2004197550A (en) 2002-10-23 2003-05-20 Working vehicle

Country Status (1)

Country Link
JP (1) JP2004197550A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004076264A1 (en) 2003-02-27 2004-09-10 Komatsu Ltd. Rops canopy of hydraulic shovel
WO2005121460A1 (en) 2004-06-09 2005-12-22 Komatsu Ltd. Canopy installation structure in working vehicle
JP2007297841A (en) * 2006-04-28 2007-11-15 Hitachi Constr Mach Co Ltd Construction machinery
US7673931B2 (en) 2004-06-09 2010-03-09 Komatsu Ltd. Working vehicle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004076264A1 (en) 2003-02-27 2004-09-10 Komatsu Ltd. Rops canopy of hydraulic shovel
WO2005121460A1 (en) 2004-06-09 2005-12-22 Komatsu Ltd. Canopy installation structure in working vehicle
US7673931B2 (en) 2004-06-09 2010-03-09 Komatsu Ltd. Working vehicle
JP2007297841A (en) * 2006-04-28 2007-11-15 Hitachi Constr Mach Co Ltd Construction machinery
JP4555252B2 (en) * 2006-04-28 2010-09-29 日立建機株式会社 Construction machinery

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