JP2005161994A - Cab for construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily open/close the front surface section of a cab box by housing a lower front window by a simple work. <P>SOLUTION: A window guiding rail 19 which is provided on a left side surface section 15 and a right side surface section 16 of the cab box 12 is constituted in such a manner that a lower front window 27 is housed on a top surface section 17 side along the window guiding rail 19 in the same manner as an upper front window 23 by forming a vertical rail section 20 on the front side extending from the lower section to the upper section. Therefore, after moving the upper front window 23 to the top surface section 17 side along the window guiding rail 19, the lower front window 27 is moved to the top surface section 17 side along the window guiding rail 19, and can be arranged at an open window position. Thus, the lower front window 27 can be housed on the top surface section 17 side by a simple work in the same manner as the upper front window 23 without being detached. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cab for construction machinery provided in, for example, a hydraulic excavator, and more particularly to a cab for construction machinery provided with a front window that can be opened and closed.

  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.

  Further, on the turning frame constituting the upper turning body, a cab is provided which is positioned on the left front side and on which the operator gets on. Here, the cab is a cab box composed of a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion and a top surface portion, and an upper front window provided in the cab box and closing an upper portion of a frame-shaped front surface portion, A lower front window provided in the cab box and positioned below the upper front window and closing the lower portion of the front surface portion.

  Also, the excavator cab closes the front of the cab box, for example, when an operator works with the upper body leaning forward, or when exchanging words with surrounding workers. The front window can be opened and closed.

  Specifically, left and right window guide rails extending in an L shape along the front surface and the top surface are provided on the left side and right side of the cab box, and attached to, for example, the four corners of the upper front window. The roller is engaged with the groove-shaped window guide rail. Thereby, the operator can block | close the upper part of this front part by moving an upper front window to the front part side along each window guide rail. On the other hand, by moving the upper front window along the window guide rails to the top surface side, the upper front window can be stored below the top surface portion, and the upper portion of the front surface portion can be opened (for example, see Patent Document 1).

Japanese Utility Model Publication No. 6-50920

  Further, the lower front window of the cab is detachably attached to, for example, a lower portion of the front surface portion, and the front surface portion can be completely opened by removing the lower front window. The removed lower front window is attached to, for example, the upper front window, and is stored on the top surface side together with the upper front window (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 60-89019

  By the way, in the thing by patent document 1 mentioned above, an upper front window can be stored in the top | upper surface part side by moving along a window guide rail. According to Patent Document 2, the lower front window can be stored on the top surface side together with the upper front window by removing the lower front window from the front surface portion and attaching it to the upper front window.

  However, as in Patent Document 2, in order to remove the lower front window and attach it to the upper front window, the lower front window is removed from the cab box, the lower front window is lifted in a narrow cab, and the upper front window is You must perform the work of attaching to. Therefore, a lot of labor is required to open and close the lower front window, and there is a problem that workability is poor.

  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 store the lower front window with a simple operation and to easily open and close the front portion of the cab box. It is to provide a cab for construction machinery.

  The construction machine according to the invention of claim 1 is a cab box comprising a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion and a top surface portion, an upper front window provided in the cab box and closing an upper portion of the front surface portion, A lower front window which is provided in the cab box and which is located below the upper front window and closes the lower portion of the front surface portion.

  In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the left and right side portions of the cab box extend along the front surface portion and the top surface portion, and the upper front window and the lower front portion. Left and right window guide rails for guiding the window are provided, and the upper front window is located between the closed window position for closing the upper part of the front portion of the cab box and the opened window position stored on the top surface side. The lower front window has a closed window position that closes the lower part of the front part of the cab box and an open window position that is stored on the top surface side. In the meantime, it is configured to move while being guided by the left and right window guide rails.

  According to the second aspect of the present invention, the upper front window and the lower front window are arranged in parallel so as to overlap with each other when stored on the top surface side.

  According to the invention of claim 3, the left and right window guide rails include a vertical rail portion extending upward and downward along the front surface portion of the cab box, and a rearward direction from the upper portion of the vertical rail portion along the top surface portion. And a retraction rail provided by branching upward from the front position of the horizontal rail, and the upper front window moves along the retraction rail when stored in the open window position. Thus, the lower front window is retracted to the upper side from the horizontal rail portion, and the lower front window is stored at a position overlapping the lower side of the upper front window retracted to the upper side at the open window position.

  According to the invention of claim 4, an upper window locking means for locking the upper front window at the open window position is provided between at least one side surface portion of the cab box and the upper front window, and at least one of the cab box is provided. The lower window locking means for locking the lower front window at the opening position is provided between the side surface portion and the lower front window.

  According to the invention of claim 5, the upper front window and the lower front window are located on the upper and lower sides, the left and right upper and lower rollers moving along the left and right window guide rails, respectively. This is to provide a grip for gripping when opening and closing.

  According to the invention of claim 1, by moving the upper front window to the top surface side along the left and right window guide rails, the upper front window is disposed at the open window position and the upper side of the front portion of the cab box The part can be opened. In addition, the lower front window can move toward the opening position on the top surface side along the left and right window guide rails common to the upper front window, so without removing the lower front window, The lower part of the front part can be easily opened. Further, the upper front window and the lower front window can be easily closed along each window guide rail.

  As a result, the lower front window can be easily opened and closed along the left and right window guide rails in the same way as the upper front window, making it easier to open and close each front window. Can be improved.

  According to the invention of claim 2, since the upper front window and the lower front window can be stored in parallel so as to overlap the upper and lower sides, the lower front window is stored in a space for storing the upper front window. Can also be stored.

  According to the invention of claim 3, the upper front window can be retracted further upward than the horizontal rail portion by the retracting rail portion extending upward from the horizontal rail portion, so that the upper front window is located at a position overlapping the lower side of the upper front window. A storage space for storing the lower front window can be formed. As a result, the lower front window can be stored using the storage space formed on the lower side of the upper front window, so the height dimension (indoor height) inside the cab box can be increased, and the operator The working environment can be improved. In addition, by storing the upper front window and the lower front window on top and bottom, each front window can be stored on the top side even when the front and rear dimensions of the cab box are short. .

  According to the invention of claim 4, when the upper front window and the lower front window are arranged at the opening position, the front windows are locked at the opening position (retracted state) by the upper window locking means and the lower window locking means. be able to. Thereby, it can prevent that an upper front window and a lower front window rattle, and can improve reliability.

  According to the invention of claim 5, the upper front window and the lower front window can be opened and closed easily and reliably by grasping the upper and lower handles. Further, when the front windows are opened and closed, the upper roller and the lower roller move smoothly along the window guide rail, so that the opening and closing operations of the front windows can be performed smoothly.

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

  In FIG. 1, reference numeral 1 denotes a wheel-type hydraulic excavator as a construction machine. The hydraulic excavator 1 is mounted on a self-propelled lower traveling body 2 and on the lower traveling body 2 so as to be able to turn. 2 is constituted roughly by an upper swing body 3 constituting a vehicle body and a work device 4 provided on the front side of the upper swing body 3 so as to be able to move up and down and performing excavation work of earth and sand.

  Here, the lower traveling body 2 includes a track frame 2A extending in the front and rear directions, a left and right front wheel 2B and a left and right rear wheel 2C (both left side) provided rotatably on the track frame 2A. (Only shown). The upper revolving unit 3 is mounted on the revolving frame 3A that is a revolving frame 3A that forms a structure, a cab 11 that will be described later mounted on the left front side of the revolving frame 3A, and a rear side of the cab 11. The engine and tank (not shown) and a counterweight 3B attached to the rear end of the swivel frame 3A are roughly configured.

  Reference numeral 11 denotes a cab according to the present embodiment mounted on the left front side of the revolving frame 5, and the cab 11 defines a cab in which an operator gets on. The cab 11 is generally configured by a cab box 12, a window guide rail 19, an upper front window 23, an upper window locking device 24, a lower front window 27, a lower window locking device 28, and the like which will be described later. Further, inside the cab 11, a driver's seat 31 is disposed on a floor plate 32 described later, and a steering device, an accelerator pedal, a brake pedal, and the like are disposed on the front side of the driver's seat 31. Further, on the left and right sides of the driver's seat 31, an operation lever for operating the work device 4, various switches, etc. (all not shown) are arranged.

  Reference numeral 12 denotes a cab box that forms the outer shape of the cab 11. The cab box 12 includes a front surface portion 13 disposed on the front side and a rear surface facing the front surface portion 13 as shown in FIGS. 1 and 2. The rear surface portion 14 arranged, the left side surface portion 15 provided on the left side between the front surface portion 13 and the rear surface portion 14, and the right side surface portion 13 between the front surface portion 13 and the rear surface portion 14. The right side surface portion 16 provided and the top surface portion 17 provided by closing the upper side are formed in a box shape.

  Here, the front surface portion 13 of the cab box 12 is formed as a frame-like body that is curved so as to protrude forward and opens in a quadrangular shape. An elastic seal frame 13A that seals between the two is attached. Further, as shown in FIG. 1, a center pillar 15A is provided on the left side surface portion 15 of the cab box 12 at a middle portion in the front and rear directions, and a door for getting in and out is located on the front side from the center pillar 15A. 18 is attached so that it can be opened and closed.

  Reference numeral 19 denotes left and right window guide rails (only the right side is shown) provided on the left side 15 and right side 16 of the cab box 12, respectively. Here, as shown in FIG. 3, each window guide rail 19 is formed as a substantially L-shaped recessed groove extending from the front lower portion to the rear upper portion through the front upper portion along the front surface portion 13 and the top surface portion 17. Has been.

  Specifically, the left and right window guide rails 19 are curved along the front surface portion 13 while extending upward and downward, and from the upper portion of the vertical rail portion 20 along the top surface portion 17. A linear horizontal rail portion 21 extending in the direction and a retracting rail portion 22 branched from the front position of the horizontal rail portion 21 to the upper side are roughly configured. The horizontal rail portion 21 guides the rollers 23C, 23D, 27C, 27D of the front windows 23, 27 in the horizontal direction when the upper front window 23 and the lower front window 27 are stored on the top surface portion 17 side. It is.

  Further, the vertical rail portion 20 constituting the front portion of the window guide rail 19 is an upper window guide portion 20A from the lower side to the upper portion of the middle portion in the upper and lower directions, and below the upper window guide portion 20A. The foot portion of the operator who is positioned serves as the lower window guide portion 20B. Here, the upper window guiding portion 20A has a function of guiding an upper front window 23 described later to a closed window position and guiding the lower front window 27 so as to be movable upward and downward. Further, the lower window guide portion 20B has a function of guiding the lower front window 27 to the closed window position.

  Further, a roller positioning member 20C for positioning a lower roller 23D of an upper front window 23 (described later) at a closed window position is attached to the upper window guide portion 20A at a lower position near the boundary with the lower window guide portion 20B. It has been. Further, the upper end portion of the upper window guide portion 20A becomes a bent portion 20D that is bent so as to protrude forward, and the bent portion 20D moves upward in the direction in which the upper front window 23 is pressed against the elastic seal frame 13A of the front surface portion 13. The roller 23C is guided.

  On the other hand, a roller positioning member 20E for positioning a lower roller 27D of a lower front window 27 (described later) at the closed window position is attached to the lower end of the lower window guide portion 20B. Further, a roller holding member 20F that elastically holds the upper roller 27C of the lower front window 27 is attached to the upper end portion of the lower window guide portion 20B.

  Further, the retracting rail portion 22 includes a branch portion 22A that branches from the horizontal rail portion 21 and protrudes upward, and a roller holding portion 22B that is bent forward from the front end side of the branch portion 22A. Thereby, as shown in FIG. 7, the retraction rail portion 22 is engaged with the roller holding portion 22B through the branch portion 22A by engaging the lower roller 23D of the upper front window 23 laid sideways in the front and rear directions. The front side portion of the front window 23 can be held at a position higher than the horizontal rail portion 21. And in the state which hold | maintained the front side part of the upper front window 23 in the position higher than the horizontal rail part 21, the below-mentioned storage space 33 which stores the lower front window 27 in the upper front window 23 can be formed. it can.

  Reference numeral 23 denotes an upper front window provided in the cab box 12. The upper front window 23 is an upper portion of the front surface portion 13 formed as a frame-like body, more specifically, from the lower side of the middle portion in the upper and lower directions to the upper portion. It closes the gap. Further, as shown in FIG. 4, the upper front window 23 corresponds to the front surface portion 13, and is curved in the front and rear directions and extends upward and downward. A rectangular glass 23B attached to the front side, left and right upper rollers 23C positioned above the window frame 23A and rotatably provided so as to protrude left and right, and the window frame The left and right lower rollers 23D, which are provided on the lower side of 23A and are rotatably provided so as to protrude in the left and right directions, and are provided on the upper and lower positions on the rear side of the window frame 23A. It is roughly constituted by the handles 23E and 23F.

  Further, as shown in FIG. 2 and the like, a sealing member 23G made of, for example, an elastic rubber material is attached to the lower end edge of the window frame 23A. The sealing member 23G brings the upper front window 23 into the closed window position. When placed, the space between the lower front window 27 is sealed. Further, a lock main body 26 of an upper window locking device 24 described later is attached to the window frame 23A.

  The upper front window 23 is attached to the cab box 12 so that the upper roller 23C and the lower roller 23D are movably engaged with the left and right window guide rails 19. That is, as shown in FIG. 2, the upper front window 23 stands along the front surface portion 13, the lower roller 23D is fitted to the roller positioning member 20C of the vertical rail portion 20, and the upper roller 23C enters the bent portion 20D. This state becomes the closed window position, and the upper portion of the front surface portion 13 can be closed at this position.

  On the other hand, the upper front window 23 moves the upper roller 23C and the lower roller 23D along the vertical rail portion 20 and the horizontal rail portion 21, and moves the lower roller 23D from the state of lying down on the top surface portion 17 side. By being fitted to the 22 roller holding portions 22B, it can be arranged at the open window position stored below the top surface portion 17, and the upper portion of the front surface portion 13 can be opened at this position.

  Reference numeral 24 denotes an upper window locking device as an upper window locking means provided between the right side surface 16 of the cab box 12 and the upper front window 23. Further, the upper window locking device 24 includes an engagement hole 25 which is located at the rear portion of the right side surface portion 16 and is formed near the lower side of the lateral rail portion 21 as shown in FIG. 2 and the like, as shown in FIG. The lock body 26 is provided at the upper right part of the window frame 23A of the upper front window 23, and the front end of the lock pin 26A engages and disengages from the engagement hole 25 by manual operation.

  7 and 8, the upper window locking device 24 moves the upper front window 23 to the top surface portion 17 side (the side rail portion 21 side), and holds each lower roller 23D on the retraction rail portion 22 as a roller. The upper front window 23 is fixed by inserting the lock pin 26A of the lock body 26 into the engagement hole 25 at the open window position engaged with the portion 22B.

  Reference numeral 27 denotes a lower front window provided in the cab box 12. The lower front window 27 is located below the upper front window 23 and closes the lower portion of the front surface portion 13. Further, as shown in FIG. 5, the lower front window 27 is attached to the front side of the window frame 27A and a substantially rectangular frame-shaped window frame 27A that extends in the left and right directions while being curved in the front and rear directions. The rectangular glass 27B, the left and right upper rollers 27C that are positioned above the window frame 27A and are rotatably provided so as to protrude left and right, and the lower side of the window frame 27A. Left and right lower rollers 27D that are positioned so as to protrude leftward and rightward, and handles 27E and 27F that are located on the rear side of the window frame 27A and are provided at the upper and lower positions. It is roughly composed of Further, a lock body 30 of a lower window locking device 28 described later is attached to the window frame 27A of the lower front window 27.

  The lower front window 27 is attached to the cab box 12 so that the rollers 27C and 27D can move to the left and right window guide rails 19 and can be opened and closed. That is, as shown in FIG. 6, the lower front window 27 is disposed on the front surface portion 13 side, the lower roller 27D is fitted to the roller positioning member 20E of the vertical rail portion 20, and the upper roller 27C is the roller holding member 20F. The state fitted and held in the position is the closed window position, and the lower portion of the front surface portion 13 can be closed at this position.

  On the other hand, the lower front window 27 moves the rollers 27C and 27D toward the upper side of the vertical rail portion 20, and further moves along the horizontal rail portion 21, thereby the upper front window stored on the top surface portion 17 side. 23 can be stored in parallel so as to overlap with the lower side of the front side 23, and the lower side portion of the front surface part 13 can be opened at the opening position.

  Reference numeral 28 denotes a lower window locking device as lower window locking means provided between the right side surface portion 16 of the cab box 12 and the lower front window 27. The lower window locking device 28 is provided in the engagement hole 29 on the right side surface portion 16 side and the upper right portion of the window frame 27A of the lower front window 27 in substantially the same manner as the upper window locking device 24 described above. The lock body 30 is configured to engage and disengage 30A from the engagement hole 29.

  Then, as shown in FIG. 8, the lower window locking device 28 is disposed in the lower front window 27 on the lower side of the upper front window 23 stored on the top surface 17 side, and in this state, is locked in the engagement hole 29. By inserting the lock pin 30 </ b> A of the main body 30, the lower front window 27 can be fixed at the open window position (storage position).

  A driver's seat 31 is located in the cab box 12 and is disposed on the floor board 32. The driver's seat 31 is seated by an operator who has boarded the cab 11.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, the operator can sit on the driver's seat 31 and operate the lower traveling body 2 by operating the steering device, the accelerator pedal, the brake pedal, and the like in this state. Further, by operating the operation lever or the like, the working device 4 can be moved up and down to perform soil excavation work or the like.

  Next, when excavating a deep hole with the work device 4, the operator cannot open the front front window 23 and the lower front window 27 because the front end side of the work device 4 cannot be seen while sitting on the driver's seat 31. The work apparatus 4 is operated by raising the waist from the seat 31 and riding the upper body forward and looking down. Further, the upper front window 23 and the lower front window 27 are also opened when working while exchanging words with surrounding workers.

  Therefore, a procedure for opening and closing the upper front window 23 and the lower front window 27 will be described with reference to FIGS. 2, 6, 7, and 8.

  First, when the upper front window 23 is opened and stored, the operator grasps the grips 23E and 23F and moves the upper roller 23C and the lower roller 23D from the vertical rail portion 20 to the horizontal rail portion 21 side. At this time, as shown in FIG. 6, the upper roller 23 </ b> C is retracted until the upper roller 23 </ b> C comes close to the rearmost portion of the horizontal rail portion 21 while the upper front window 23 is laid down. Accordingly, the lower roller 23D of the upper front window 23 can be disposed at a position corresponding to the retracting rail portion 22 branched upward from the lateral rail portion 21.

  Next, the operator moves the entire upper front window 23 forward while lifting the front position of the upper front window 23 that has been laid down and causing the lower roller 23D to enter the branching portion 22A of the retracting rail portion 22. As a result, as shown in FIG. 7, the upper front window 23 is in a state where the lower roller 23D is engaged with the roller holding portion 22B of the retracting rail portion 22 and is lifted. The upper front window 23 is fixed in the front and rear directions by the lock device 24. As a result, the upper front window 23 can be disposed at the open window position stored below the top surface portion 17. In addition, the upper front window 23 at the open window position is in a state of being sideways and the front side is retracted to the upper side of the lateral rail portion 21. A storage space 33 for storing the side front window 27 can be formed.

  Next, when the upper front window 23 is stored on the top surface 17 side and disposed at the opening position, the operation of opening the lower front window 27 is started. First, the operator grasps the grips 27E and 27F, moves the lower front window 27 upward along the vertical rail portion 20, and then moves the rear front side along the horizontal rail portion 21 while lying down on the lower front window 27. Move to. When the lower front window 27 is arranged in the storage space 33 below the upper front window 23, the lower front window 27 is fixed in the front and rear directions by the lower window locking device 28 at this position. Accordingly, the lower front window 27 can be stored in the storage space 33 (below the top surface portion 17) and disposed at the open window position.

  Here, by arranging the lower front window 27 in parallel with the storage space 33 so as to overlap the lower side of the upper front window 23, the upper and lower spaces required to store the upper front window 23 are placed in the upper and lower spaces. Both the front window 23 and the lower front window 27 can be stored compactly. Thereby, even when the front and rear dimensions of the cab box 12 are short, the front windows 23 and 27 can be stored on the top surface portion 17 side.

  On the other hand, the upper front window 23 and the lower front window 27 are moved to the closed position as shown in FIG. 2 by performing the operation in the opposite procedure to the opening operation of the upper front window 23 and the lower front window 27 described above. The front surface portion 13 of the cab box 12 can be closed.

  Thus, according to the present embodiment, the window guide rail 19 provided on the left side surface portion 15 and the right side surface portion 16 of the cab box 12 is formed by forming the front vertical rail portion 20 from the lower part to the upper part. The lower front window 27 is stored along the guide rail 19 on the top surface portion 17 side. Accordingly, after the upper front window 23 is moved along the window guide rail 19 to the top surface portion 17 side, the lower front window 27 is moved along the window guide rail 19 toward the top surface portion 17 side and arranged at the open window position. be able to.

  As a result, the lower front window 27 can be stored on the top surface portion 17 side as easily as the upper front window 23 without being attached and detached as in Patent Document 2, so that the opening and closing operations can be performed. Workability can be improved easily.

  Further, since the left and right window guide rails 19 are provided with retraction rail portions 22 extending upward from the horizontal rail portion 21, the upper front window 23 can be retreated further upward than the horizontal rail portion 21. . As a result, a storage space 33 can be formed below the stored upper front window 23, and the lower front window 27 is stored in parallel with the upper front window 23 by using the storage space 33. be able to.

  Therefore, the height dimension (indoor height) of the cab box 12 can be increased, and the operator's working environment can be improved. In addition, the upper front window 23 and the lower front window 27 can be stored compactly in the front and rear directions, and the front windows 23 and 27 can be mounted on the top surface even when the front and rear dimensions of the cab box 12 are short. 17 can be stored efficiently.

  Further, when the upper front window 23 and the lower front window 27 are arranged at the open window position, the front windows 23 and 27 are locked at the open window position (stored state) by the upper window lock device 24 and the lower window lock device 28. be able to. As a result, rattling of the upper front window 23 and the lower front window 27 can be prevented, and reliability and the like can be improved.

  Further, when the upper front window 23 and the lower front window 27 are opened and closed with the left and right upper rollers 23C and 27C and the lower rollers 23D and 27D moving along the left and right window guide rails 19, respectively. And grips 23E, 23F, 27E, and 27F are provided. Thereby, the upper front window 23 and the lower front window 27 can be easily and reliably opened and closed by grasping the grips 23E, 23F, 27E, and 27F. Further, when the front windows 23 and 27 are opened and closed, the upper rollers 23C and 27C and the lower rollers 23D and 27D move smoothly along the window guide rail 19, so that the front windows 23 and 27 are opened and closed. Operation can be performed smoothly.

  In the embodiment, the upper front window 23 is rotatably provided with rollers 23C and 23D so as to protrude leftward and rightward, and the rollers 23C and 23D are provided along the groove-shaped window guide rails 19. It was set as the structure moved. However, the present invention is not limited to this. For example, the upper front window is provided with a protrusion made of a resin material or a metal material having self-lubricating properties so as to protrude in the left and right directions, and the protrusion is provided along the window guide rail 19. It is good also as a structure to which it moves. This configuration can be similarly applied to the lower front window 27.

  In the embodiment, the case where the upper window locking device 24 as the upper window locking means is provided between the right side surface portion 16 of the cab box 12 and the upper front window 23 has been described as an example. However, the present invention is not limited to this. For example, an upper window locking device 24 may be provided between the left side surface portion 15 of the cab box 12 and the upper front window 23. Further, the upper window locking device 24 may be provided between the left side surface portion 15 and the right side surface portion 16 of the cab box 12 and the upper front window 23, respectively. This configuration can be similarly applied to the lower window locking device 28.

  In the embodiment, the cab 11 of the wheel-type hydraulic excavator 1 is described as an example of the cab for the construction machine. However, the present invention is not limited to this. For example, the cab 11 according to the present embodiment may be applied to a hydraulic excavator provided with a crawler type lower traveling body. Furthermore, it can be widely applied to cabs of other construction machines such as hydraulic cranes, wheel loaders, tractors, and the like.

1 is a front view showing a wheel-type hydraulic excavator to which a cab for construction equipment according to an embodiment of the present invention is applied. It is sectional drawing which shows the inside of the cab shown in FIG. 1 in the state which closed the upper front window and the lower front window. It is sectional drawing which looked at the inside of the cab from the position similar to FIG. 2 in the state which abbreviate | omitted the upper front window and the lower front window. It is an external appearance perspective view which expands and shows an upper front window. It is an external appearance perspective view which expands and shows a lower front window. It is sectional drawing seen from the same position as FIG. 2 which shows the state which retracted the upper front window to the horizontal rail part last part of the window guide rail. It is sectional drawing seen from the position similar to FIG. 2 which shows the state which put the lower roller in the retracting rail part, and has arrange | positioned the upper front window in the opening position. It is sectional drawing seen from the same position as FIG. 2 which shows the state which stored the lower front window in the storage space of the lower side of the upper front window.

Explanation of symbols

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 11 Cab 12 Cab box 13 Front part 14 Rear surface part 15 Left side part 16 Right side part 17 Top surface part 19 Window guide rail 20 Vertical rail part 21 Horizontal rail part 22 Retraction rail part 23 Upper front window 23C, 27C Upper roller 23D, 27D Lower roller 23E, 23F, 27E, 27F Handle 24 Upper window lock device (upper window lock means)
27 Lower front window 28 Lower window locking device (lower window locking means)
33 Storage space

Claims (5)

A cab box comprising a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion and a top surface portion; an upper front window provided on the cab box for closing an upper portion of the front surface portion; and an upper front window provided on the cab box. In a cab for construction machinery, comprising a lower front window located on the lower side and closing the lower part of the front surface part,
The left and right side of the cab box are provided with left and right window guide rails extending along the front surface and the top surface to guide the upper front window and the lower front window,
The upper front window moves while being guided by the left and right window guide rails between a closed window position for closing the upper portion of the front portion of the cab box and an open window position stored on the top surface side. With a configuration to
The lower front window is guided by the left and right window guide rails between a closed window position for closing the lower part of the front portion of the cab box and an open window position stored on the top surface side. The construction machine cab is characterized in that it is configured to move.   The cab for a construction machine according to claim 1, wherein the upper front window and the lower front window are arranged in parallel so as to overlap with each other when stored on the top surface side. The left and right window guide rails include a vertical rail portion extending upward and downward along the front portion of the cab box, and a horizontal rail portion extending rearward from the upper portion of the vertical rail portion along the top surface portion. And a retraction rail portion provided by branching upward from the front side position of the horizontal rail portion,
The upper front window is retracted to the upper side of the lateral rail part by moving along the retracting rail part when stored in the open window position,
The cab for a construction machine according to claim 1 or 2, wherein the lower front window is configured to be stored at a position overlapping the lower side of the upper front window retracted upward at the open position.   Between the at least one side surface of the cab box and the upper front window, an upper window locking means for locking the upper front window at an open window position is provided, and at least one side surface of the cab box and the lower front window are provided. The cab for construction machinery according to claim 1, 2 or 3, wherein a lower window locking means for locking the lower front window at an open window position is provided between the side front windows.   The upper front window and the lower front window include left and right upper rollers and lower rollers that move along the left and right window guide rails, and when opened and closed on the upper and lower sides. The construction machine cab according to claim 1, 2, 3, or 4, wherein a grip is provided.

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