JP2009287391A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect an operator by a simple configuration while providing the operator with the wide rear field of view. <P>SOLUTION: A left rear pillar 21 for a cab box 16 is disposed at the rear position of a driver's seat 13, Accordingly, when a large load is worked to the cab box 16, the number of parts configuring the cab box 16 can be reduced and a workability on an assembly can be improved because a section near to the operator sitting on the driver's seat 13 can be reinforced efficiently by the left rear pillar 21 in the cab box 16 surrounding the driver's seat 13. The left-rear pillar 21 can be removed from the field of view at a time when the operator looks back to the rear side and the rear field of view can be widened because the left rear pillar 21 for the cab box 16 is disposed at the rear position of the driver's seat 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cab for construction machinery that is suitably used for construction machinery such as a hydraulic excavator.

  In general, a hydraulic excavator as a construction machine is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front-rear side of the upper revolving body that can be raised and lowered. And a work device.

  The hydraulic excavator includes, for example, a small hydraulic excavator (hereinafter referred to as a small swing excavator) called a small rear swing machine. This small turning type hydraulic excavator is configured so that the upper turning body is formed in a substantially circular shape when viewed from the upper side, so that it is within the vehicle width when turning.

  The upper swing body of the small swing hydraulic excavator has a swing frame as a base, and a cab on which an operator gets on the left is mounted on the swing frame. The excavator cab includes, for example, a floor plate laid on a swing frame, a driver seat on which the operator is seated, and a hollow cab box attached to the floor plate so as to surround the driver seat And. The cab box has pillars extending in the upward and downward directions at the corners of the left front, right front, left rear, and right rear, and the front, left side, right side, and rear side between the pillars. .

  Here, there is a possibility that the excavator may fall over when working in an unreasonable posture on a steep slope, for example. Further, when the excavator falls, a large load acts on the cab. Accordingly, the cab of the excavator is designed to increase the strength of the cab so as to protect the operator who is operating inside the cab even if it falls down, so that the cab box and the like constituting the cab are not greatly deformed.

  Therefore, a cab with increased strength will be described. For example, this cab is provided with a bulging portion having a substantially U-shaped cross section extending upward and downward on an inner panel and an outer outer panel, respectively, and the inner panel and the outer panel are welded with the bulging portions facing each other. Thus, a plurality of hollow pillars are formed. Further, by providing a reinforcing plate having a substantially U-shaped cross section in each pillar, the strength of each pillar is increased and the entire cab box is formed with high strength (for example, see Patent Document 1).

JP-A-11-166247

  By the way, in the above-described prior art, each pillar has a hollow structure, and a reinforcing plate having a substantially U-shaped cross section is welded inside each pillar. Therefore, the number of parts constituting the cab box is large. Since many welding operations are required, there is a problem that assembly workability is poor and productivity is lowered.

  In addition, since the operator to be protected is seated in the approximate center of the cab, each pillar constituting the cab box is disposed away from the driver seat where the operator is seated. For this reason, in order to protect an operator with a pillar, there exists a problem that the intensity | strength of this pillar must be raised more than necessary.

  In addition, since the cab box has pillars at the left rear corner and the right rear corner, when the operator seated in the driver's seat turns back, the left and right corner There is a problem that the pillar provided in the door is in the way and the rear view is damaged by the pillar.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a cab for a construction machine that can protect an operator with a simple configuration and can provide a wide rear view to the operator. Is to provide.

  The construction machine cab according to the invention of claim 1 includes a driver's seat on which an operator is seated, and a front left, a front right, a middle left, a rear left, and a rear right provided so as to surround the driver's seat. A hollow cab box having five surfaces including a front surface, a left front side surface, a left rear side surface, a right side surface, and a rear surface is provided between the pillars.

  And in order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the left rear pillar forming the cab box is the position of the operator seated on the driver's seat at the rear position of the driver's seat. There exists in the structure arrange | positioned in the range which does not impair a back view.

  According to the invention of claim 2, the left intermediate pillar of the cab box is disposed in a lateral position of the driver's seat, and the left rear side surface of the cab box has an arc shape from the left intermediate pillar toward the left rear pillar. This is because it is formed as a curved surface.

  According to the invention of claim 3, the left rear pillar of the cab box is formed integrally with the left rear side surface by abutting an inner panel and an outer panel.

  According to a fourth aspect of the present invention, the left rear pillar of the cab box is formed as a strength member having a hollow cylindrical cross section.

  According to a fifth aspect of the present invention, the left rear pillar of the cab box is disposed at a position immediately behind the driver seat.

  According to the first aspect of the present invention, since the left rear pillar constituting the cab box is disposed at the rear of the driver's seat, the portion of the cab box close to the operator seated on the driver's seat is more efficient by the left rear pillar. Can be strengthened well. Therefore, for example, even when a construction machine falls and a large load is applied to the cab box, the deformation of the cab box can be suppressed to a small level at the operator's position.

  As a result, since the number of parts constituting the cab box can be reduced, the assembly workability can be improved. Further, since each pillar can be formed thin, the inside of the cab box can be widened to improve the operator's working environment.

  In addition, the left rear pillar of the cab box is located in the rear position of the driver seat within a range that does not impair the rear view of the operator seated in the driver seat, so when the operator seated in the driver seat turns back The left rear pillar does not block the view. Thereby, an operator's back view can be expanded and workability | operativity can be improved.

  According to the invention of claim 2, since the left intermediate pillar of the cab box is arranged near the driver's seat, the portion near the operator seated in the driver's seat in the cab box together with the left rear pillar can be efficiently used. Can be strengthened.

  Also, the left rear side surface formed as an arc-shaped curved surface from the left intermediate pillar toward the left rear pillar is used for a small hydraulic excavator called a small rear swirler in which the upper swing body is formed in a substantially circular shape, for example. Since the cab box can be arranged so that the left rear side does not come out of the turning radius, the turning performance can be improved by reducing the turning radius.

  Furthermore, since the left rear side surface of the cab box has an arcuate curved surface, the rigidity can be increased as compared with the flat surface, so that the strength of the cab box can be further increased in the vicinity of the driver's seat.

  According to the invention of claim 3, since the left rear pillar and the left rear side surface of the cab box can be integrally formed only by abutting the inner panel and the outer panel, the configuration of the cab box is simplified. Assembling workability can be improved.

  According to the invention of claim 4, since the left rear pillar of the cab box is formed as a strength member having a hollow cross-sectional cylindrical shape, the strength of the cab box can be further increased, and reliability, Assembly workability and the like can be improved.

  According to the fifth aspect of the present invention, since the left rear pillar of the cab box is disposed at the position immediately behind the driver's seat, the left rear pillar can be disposed closest to the driver's seat. As a result, the deformation of the cab box can be minimized at the operator's position. Further, when the operator sitting on the driver's seat turns back, the left rear pillar can be disposed at a position where the operator does not enter the field of view, and the operator's rear field of view can be further expanded.

It is a front view showing a hydraulic excavator provided with a cab according to an embodiment of the present invention. It is a rear view which shows the hydraulic excavator provided with the cab which concerns on embodiment of this invention. It is a right view which shows the hydraulic excavator provided with the cab which concerns on embodiment of this invention. It is a top view which expands and shows the hydraulic excavator provided with the cab which concerns on embodiment of this invention. It is a perspective view which shows the hydraulic excavator provided with the cab which concerns on embodiment of this invention from the left rear side. It is a cross-sectional view which expands and shows the structure in a cab in the state which abbreviate | omitted glass and the door from the arrow VI-VI direction in FIG. It is a front view which expands and shows the cab of the state which abbreviate | omitted glass and the door. It is a right view which expands and shows the cab of the state which omitted the glass and the door. It is a perspective view which shows a cab box from the right front side. It is a perspective view which shows a cab box from the right rear side. It is a perspective view which shows a cab box from the left rear side. It is a disassembled perspective view which decomposes | disassembles and shows the inner panel and outer panel which form a left rear pillar, a right side board, a rear surface board, and a left rear side board.

  Hereinafter, as a construction machine cab according to an embodiment of the present invention, a cab provided on a crawler hydraulic excavator will be described as an example, and will be described in detail with reference to FIGS.

  1 to 3, reference numeral 1 denotes a cab specification hydraulic excavator as a construction machine applied to the present embodiment. The hydraulic excavator 1 includes a self-propelled lower traveling body 2 and an upper traveling body 2. The upper revolving unit 3 is mounted so as to be capable of swiveling, and the working device 4 is provided on the front side of the upper revolving unit 3 so as to be able to move up and down and performs excavation work of earth and sand. Furthermore, the hydraulic excavator 1 is configured as a small rear turning machine in which the upper turning body 3 can turn substantially within the vehicle width of the lower traveling body 2, for example.

  Further, as shown in FIGS. 4 and 5, the upper swing body 3 includes, for example, a swing frame 5 formed using a thick steel plate, an engine mounted on the rear side of the swing frame 5, and the like. An outer cover 6 provided from the right side to the rear side of the revolving frame 5 and covering a fuel tank, a hydraulic oil tank, a radiator, an oil cooler, an engine, a hydraulic pump (all not shown), and the revolving frame 5 The counter weight 7 attached to the rear end of the rear frame and a cab 11 (described later) provided on the left side of the revolving frame 5 are roughly configured. Further, as shown in FIG. 4, the upper turning body 3 is formed in a substantially circular shape when viewed from above so that it can turn substantially within the vehicle width of the lower traveling body 2.

  Next, 11 is a cab of the excavator 1 mounted on the left side of the revolving frame 5, and the cab 11 defines a cab in which an operator performs various operations. The cab 11 is mounted on the revolving frame 5 via an anti-vibration mount (not shown). Further, as shown in FIGS. 6 to 8, the cab 11 is roughly constituted by a floor plate 12, a driver's seat 13, a cab box 16 and the like which will be described later.

  Reference numeral 12 denotes a floor plate disposed on the revolving frame 5, and the front portion of the floor plate 12 is attached to a mounting base (not shown) provided on the revolving frame 5. Further, the rear side of the floor plate 12 rises in a step shape to become a driver seat base 12A, and the rear portion of the driver seat base 12A is attached to a support frame (not shown) provided on the rear side of the turning frame 5. ing.

  Reference numeral 13 denotes a driver seat provided on the driver seat base 12A of the floor board 12, and the driver seat 13 is seated by an operator. Further, the driver's seat 13 is disposed at a substantially central portion in the left and right directions near the rear side in a cab box 16 described later. Further, a work lever 14 is provided on both the left and right sides of the driver's seat 13, and a traveling lever / pedal 15 is provided on the front side of the driver's seat 13 at the front portion of the floor plate 12. And the circumference | surroundings of the driver's seat 13 are covered with the cab box 16 mentioned later.

  Reference numeral 16 denotes a cab box provided on the revolving frame 5 so as to surround the driver's seat 13, and the cab box 16 is mounted together with the floor plate 12 on an anti-vibration mount (not shown) provided on the revolving frame 5 side, for example. It is tightened together. The cab box 16 forms the outer shape of the cab 11. As shown in FIGS. 6 to 12, the left front pillar 17, the right front pillar 18, the right rear pillar 19, and the center pillar 20, which will be described later, extend upward and downward. And 5 pillars composed of the left rear pillar 21. Further, the cab box 16 is provided with five surfaces including a front surface portion 16A, a right surface portion 16B, a rear surface portion 16C, a left front side surface portion 16D, and a left rear side surface portion 16E between the pillars 17 to 21. It is shaped as a body.

  Therefore, the configuration of the cab box 16 that forms the outer shape of the cab 11 will be described in detail.

  Reference numeral 17 denotes a left front pillar extending upward and downward at the left front portion of the cab box 16, and the left front pillar 17 is inclined slightly toward the rear side as shown in FIG. A ridge line between 16A and the left front side surface portion 16D is formed. The left front pillar 17 is formed using, for example, a pipe member as shown in FIG. The pipe member that forms the left front pillar 17 is arranged with a left rear pillar 21 (to be described later) in the vicinity of the rear side of the driver's seat 13, and by actively increasing the strength of this portion, a thin pipe member with a simple cylindrical structure can be used. Can be used.

  Reference numeral 18 denotes a right front pillar extending upward and downward at the right front portion of the cab box 16, and the right front pillar 18 forms a ridge line between the front surface portion 16 </ b> A and the right side surface portion 16 </ b> B of the cab box 16. The right front pillar 18 is formed by using a thin pipe member with a simple structure, for example, in substantially the same manner as the left front pillar 17.

  Reference numeral 19 denotes a right rear pillar extending upward and downward at the right rear portion of the cab box 16, and the right rear pillar 19 forms a ridge line between the right side surface portion 16B and the rear surface portion 16C of the cab box 16. Further, the right rear pillar 19 is formed by using a thin pipe member with a simple structure, for example, in substantially the same manner as the left front pillar 17.

  Reference numeral 20 denotes a center pillar as a left intermediate pillar which is located on the left side of the cab box 16 and is provided at an intermediate portion in the front and rear directions. The center pillar 20 is a boundary between the left front side surface portion 16D and the left rear side surface portion 16E. It is arranged in the vicinity of the left side of the driver's seat 13 as a position. In addition, the center pillar 20 has an inner panel 20A and an outer panel 20B, each of which has a steel plate processed to have a substantially U-shaped cross section, facing each other, and in this state, the panels 20A and 20B are fixed using welding means or the like Is formed as a hollow cylindrical column with a transverse cross section. In addition, a door 31 described later is attached to the center pillar 20 so as to be openable and closable.

  Reference numeral 21 denotes a left rear pillar disposed on the rear side of the cab box 16. The left rear pillar 21 is disposed on the left side of the right rear pillar 19 with an interval of about half the width of the cab box 16. As shown in FIGS. 6 and 8, the left rear pillar 21 is disposed at a position behind the driver seat 13 within a range that does not impair the rear view of the operator seated on the driver seat 13.

  Specifically, in the vicinity of the rear side of the driver's seat 13, a position where the operator sitting on the driver's seat 13 does not interfere with the visibility when turning to the rear side, preferably just behind the width within the width of the driver's seat 13. It is arranged in the range. Thereby, the left rear pillar 21 can effectively suppress the deformation of the cab box 16 around the position of the operator (driver's seat 13) when the excavator 1 falls or a heavy object collides, for example. it can.

  Further, by arranging the left rear pillar 21 at a position behind the driver's seat 13, the operator seated on the driver's seat 13 is provided between the center pillar 20 and the left rear pillar 21 by turning left rear. A wide range from the left rear window glass 33 to be described later to the left rear can be used as a visual field. On the other hand, when the operator turns to the right rear, a wide range from the rear window glass 29 described later provided between the right rear pillar 19 and the left rear pillar 21 to the right rear can be viewed. Thereby, a wide rear view can be provided to the operator seated in the driver's seat 13.

  Here, the left rear pillar 21 is formed as a columnar column with a transverse cross section by being fixed using welding means in a state in which an inner panel 34 and an outer panel 35 described later are abutted, and has sufficient rigidity. It is configured as a strength member. Thereby, the left rear pillar 21 can further increase the strength of the rear center portion of the cab box 16 which is important for protecting the operator.

  Reference numeral 22 denotes a left roof pillar disposed on the upper left side of the cab box 16, and the left roof pillar 22 is substantially between the upper part of the left front pillar 17 and the upper part of the center pillar 20 as shown in FIGS. 10 and 11. It extends straight and extends in an arc shape protruding outward between the upper part of the center pillar 20 and the upper part of the left rear pillar 21. Accordingly, the left roof pillar 22 forms a ridge line between the left front side surface portion 16D, the left rear side surface portion 16E, and the top surface portion 16F of the cab box 16. Further, the left roof pillar 22 is formed of, for example, a pipe member in substantially the same manner as the left front pillar 17, and is welded to, for example, the upper parts of the left front pillar 17, the center pillar 20, and the left rear pillar 21.

  Reference numeral 23 denotes a right roof pillar disposed on the upper right side of the cab box 16, and the right roof pillar 23 forms a ridge line between the right side surface portion 16B and the top surface portion 16F of the cab box 16. Further, the right roof pillar 23 is formed of, for example, a pipe member, and is welded to, for example, the upper part of the right front pillar 18 and the upper part of the right rear pillar 19 in the same manner as the left front pillar 17.

  Reference numeral 24 denotes a connection plate (see FIG. 9 and the like) constituting the front surface portion 16A of the cab box 16, and the connection plate 24 connects the lower part of the left front pillar 17 and the lower part of the right front pillar 18. The connection plate 24 forms a window frame in cooperation with the left front pillar 17, the right front pillar 18, and the roof plate 36, and the front window 25 is attached to the window frame.

  26 is a right side plate (see FIG. 9, FIG. 10, etc.) that constitutes the right side portion 16B of the cab box 16. On the upper side of the right side plate 26, there is a right window glass 27 (in FIG. 2) between the right roof pillar 23 and the like. Is attached).

  Reference numeral 28 denotes a rear plate (see FIGS. 9, 12, etc.) constituting the rear surface portion 16 </ b> C of the cab box 16. The rear plate 28 is located on the upper side and connects the right rear pillar 19 and the left rear pillar 21. The connecting plate 28A includes lower connecting plates 28B and 28C that are located on the lower side and connect the right rear pillar 19 and the left rear pillar 21 to each other. A rear window glass 29 (shown in FIG. 3) is attached to the rear plate 28.

  Reference numeral 30 denotes an entrance / exit that constitutes the left front side surface portion 16 </ b> D of the cab box 16. Moreover, the entrance / exit 30 can be opened and closed by a door 31 (illustrated in FIG. 1) that also constitutes the left front side surface portion 16D.

  Reference numeral 32 denotes a left rear side plate constituting the left rear side portion 16E of the cab box 16, and a left rear window glass 33 (shown in FIGS. 1, 3 and 5) is attached to the left rear side plate 32. ing. Here, as shown in FIGS. 6 and 11, the left rear side plate 32 is formed as an arcuate curved surface protruding outward from the center pillar 20 toward the left rear pillar 21. As a result, the left rear side plate 32 can fit the left rear side of the cab box 16 within the turning radius of the upper swing body 3 without narrowing the living space in the cab box 16. Further, the left rear side plate 32 is formed integrally with the left rear pillar 21 using an inner panel 34 and an outer panel 35 described later.

  Next, the configuration of the left rear pillar 21 and the left rear side plate 32 will be described. The left rear pillar 21 and the left rear side plate 32 are integrally formed by opposing and fixing an inner panel 34 and an outer panel 35 described later. Therefore, the configuration of the inner panel 34 and the outer panel 35 that form the left rear pillar 21 and the left rear side plate 32 will be described.

  Reference numeral 34 denotes an inner panel (see FIG. 12) that forms the inner surfaces of the left rear pillar 21 and the left rear side plate 32. The inner panel 34 is located on the right side and extends upward and downward. An inner bulging portion 34A having a shape and an inner panel portion 34B extending leftward from a lower portion of the inner bulging portion 34A are formed. Further, the inner panel portion 34B of the inner panel 34 is curved in an arc shape protruding outward.

  Reference numeral 35 denotes an outer panel that forms the inner surfaces of the left rear pillar 21 and the left rear side plate 32. The outer panel 35 is located on the right side so as to face the inner bulging portion 34A of the inner panel 34. The outer bulging portion 35A having a substantially U-shaped cross section extending downward and the inner panel portion 34B extending to the left from the outer bulging portion 35A are formed. Further, the outer panel portion 35B of the outer panel 35 is curved in an arc shape protruding outward along the inner panel portion 34B of the inner panel 34.

  Then, the inner panel 34 and the outer panel 35 abut each other so that the bulging portions 34A and 35A face each other, and in this state, the inner panel 34 and the outer panel 35 are fixed by welding means, whereby the bulging portions 34A and 35A The pillar 21 is formed, and the left rear side plate 32 can be formed by the panel portions 34B and 35B.

  Reference numeral 36 denotes a roof plate that forms the top surface portion 16F of the cab box 16. The roof plate 36 is fixed to the left and right roof pillars 22, 23, etc. by welding means or the like on both left and right sides.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, an operation when the hydraulic excavator 1 is operated to perform work will be described.

  First, the operator gets on the cab 11 and sits on the driver's seat 13. By operating the traveling lever / pedal 15 in this state, the crawler of the lower traveling body 2 can be driven to move the hydraulic excavator 1 forward or backward. In addition, the operator seated in the driver's seat 13 can perform the excavation work of earth and sand by operating the left and right work levers 14 to raise and lower the work device 4.

  Here, the hydraulic excavator 1 travels in an unreasonable posture, for example, on a steep slope or the like, and may fall over when a work is carried out, and a large load acts on the cab 11 when it falls down. However, since the cab 11 according to the present embodiment has the left rear pillar 21 of the cab box 16 disposed behind the driver's seat 13, the left rear pillar 21 can be operated even when a large load is applied to the cab 11. The cab box 16 can be prevented from being greatly deformed around the driver's seat 13 and the operator seated on the driver's seat 13 can be protected.

  Further, since the left rear pillar 21 is disposed at the rear position of the driver's seat 13, the left rear pillar 21 at the rear position is in view even when an operator seated on the driver's seat 13 swings his head and turns to the rear side. Since it does not enter and does not get in the way, the operator can work efficiently with a wide rear view.

  Thus, according to the present embodiment, since the left rear pillar 21 of the cab box 16 is arranged at the rear position of the driver seat 13, the cab box 16 surrounding the driver seat 13 is seated on the driver seat 13. The portion close to the operator can be efficiently strengthened by the left rear pillar 21. Therefore, for example, even when the excavator 1 falls and a large load is applied to the cab box 16, deformation of the cab box 16 can be suppressed to a small level at the operator's position.

  As a result, sufficient strength to protect the operator can be obtained, so that the number of parts constituting the cab box 16 can be reduced and the assembly workability can be improved. Moreover, since each pillar 17-21 etc. which comprise the cab box 16 can be formed, for example with a thin pipe member, the inside of the cab 11 can be enlarged and an operator's working environment can be made favorable, and also operator's working environment can be improved. Workability can be improved by expanding the forward field of view and the like.

  Moreover, the left rear pillar 21 of the cab box 16 is disposed at the rear position of the driver seat 13 within a range that does not impair the rear view of the operator seated on the driver seat 13, so that the operator turned to the rear side. The left rear pillar 21 can be removed from the field of view, and the workability can be improved by widening the rear field of view.

  On the other hand, since the center pillar 20 is disposed near the left side of the driver's seat 13 in the cab box 16, a portion close to the operator seated on the driver's seat 13 in the cab box 16 together with the left rear pillar 21. It can be strengthened efficiently.

  Further, since the left rear side surface portion 16E of the cab box 16 is formed as an arcuate curved surface from the center pillar 20 toward the left rear pillar 21, the rear swivel 3 is formed in a substantially circular shape. When the cab 11 is mounted on a small excavator 1 called a revolving machine, the left rear side surface portion 16E can be accommodated within the revolving radius, and the working performance can be improved by reducing the revolving radius. In addition, by forming the left rear side surface portion 16E of the cab box 16 as a curved surface, the rigidity can be increased compared to the flat surface, and therefore the strength of the cab box 16 is further increased in the vicinity of the driver's seat 13. Can do.

  Further, the left rear side plate 32 and the left rear pillar 21 constituting the left rear side surface portion 16E of the cab box 16 can be integrally formed by abutting and welding the inner panel 34 and the outer panel 35. Therefore, the configuration of the cab box 16 can be simplified to improve the assembly workability and the like.

  Further, since the left rear pillar 21 of the cab box 16 is formed as a cylindrical strength member having a hollow cross section, the strength of the cab box 16 can be further enhanced by the left rear pillar 21 made of a strength member. It is possible to improve reliability, assembly workability, and the like.

  In the embodiment, the case where the left rear pillar 21 of the cab box 16 is disposed almost directly behind the driver's seat 13 has been described as an example. However, the present invention is not limited to this, and the left rear pillar 21 is located in the left and right directions from the driver seat 13 as long as the rear view of the operator seated on the driver seat 13 at the rear position of the driver seat 13 is not impaired. It is good also as a structure arrange | positioned in the position which remove | deviated.

  In the embodiment, the left rear pillar 21 of the cab box 16 is formed integrally with the left rear side plate 32 by welding the inner panel 34 and the outer panel 35 in an abutting state. However, the present invention is not limited to this, and the left rear pillar 21 may be formed separately from the left rear side plate 32. In this case, the left rear pillar 21 can be formed using a pipe member, for example, similarly to the left front pillar 17 or the like.

  Furthermore, in the embodiment, the cab 11 mounted on the crawler hydraulic excavator 1 is described as an example of the cab for the construction machine. However, the present invention is not limited to this, and may be applied to, for example, a cab of a hydraulic excavator provided with a wheel type lower traveling body.

1 Hydraulic excavator (Construction machinery)
DESCRIPTION OF SYMBOLS 5 Revolving frame 11 Cab 12 Floor board 13 Driver's seat 16 Cab box 16A Front part 16B Right side part 16C Rear part 16D Left front side part 16E Left rear side part 16F Top part 17 Left front pillar 18 Right front pillar 19 Right rear pillar 20 Center pillar (left middle) Pillar)
21 Left rear pillar 32 Left rear side plate 34 Inner panel 35 Outer panel

Claims (5)

Front, left front, and left rear between a driver's seat where the operator is seated and five pillars that are provided to surround the driver's seat and extend upward and downward, left front, right front, middle left, left rear, and right rear In a cab for a construction machine comprising a hollow cab box in which five surfaces including a side surface, a right side surface, and a rear surface are arranged,
The cab for a construction machine, characterized in that the left rear pillar forming the cab box is arranged at a position behind the driver seat within a range that does not impair the rear view of the operator seated on the driver seat.   The left intermediate pillar of the cab box is disposed in a lateral position of the driver's seat, and the left rear side surface of the cab box is formed as an arcuate curved surface from the left intermediate pillar toward the left rear pillar. Item 2. The construction machine cab according to item 1.   The cab for a construction machine according to claim 1 or 2, wherein the left rear pillar of the cab box is formed integrally with the left rear side surface by abutting an inner panel and an outer panel.   The cab for a construction machine according to claim 1, 2 or 3, wherein the left rear pillar of the cab box is formed as a strength member having a hollow cylindrical cross section inside.   The cab for construction machines according to claim 1, 2, 3, or 4, wherein the left rear pillar of the cab box is disposed at a position immediately behind the driver's seat.

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