JP2015229903A - Cab for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cab for a construction machine such that a lower front window detached from a front region can be stored in the narrow cab without being an obstacle.SOLUTION: A cab box 13 which constitutes an outer shell of a cab 11 for a construction machine is formed, as a box body, of a front region 14, a rear face region 15, a left side face region 16, a right side face region 17, and a top region 18. A lower front window 24 which is attachable and detachable is provided below the front region 14 of the cab box 13. A right upper window 27 is provided at the right side face region 17 of the cab box 13. A bridge member 29 extended in front and rear directions and fitted so as to protect an operator is provided at an inner position of a right upper window 27. The bridge member 29 is provided with a lower front upper end receiver 36 which holds the lower front window 24 attachably and detachably in a state in which the lower front window 24 detached from the front region 14 is overlaid on the right upper window 27.

Description

  The present invention relates to a construction machine cab that is suitably used for construction machines such as a hydraulic excavator and a hydraulic crane.

  In general, a hydraulic excavator, which is a representative example of a construction machine, is a self-propelled lower traveling body, an upper revolving body that is turnable on the lower traveling body, and can be raised and lowered on the front side of the upper revolving body. And a working device provided.

  The upper swing body includes a swing frame that forms a support structure, and a cab that is provided on the swing frame and on which an operator rides to operate a hydraulic excavator. This cab is provided in a cab box formed in a box shape by a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion, and a top surface portion, and is provided so as to be attached to and removable from the lower side of the front surface portion of the cab box. A lower front window, an upper front window located above the lower front window and provided at the front part of the cab box, and an operator provided at the left side part for entering and exiting the cab box. And a right window attached to a right side portion facing the door in the left and right directions. And the lower front window removed from the front part of the cab box is housed in a storage case provided on the right side of the driver seat or on the rear side of the driver seat (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 53-86720

  By the way, the hydraulic excavator has a small hydraulic excavator called a mini excavator in which the operating mass as a total weight during operation is set to less than 6 tons. In this small hydraulic excavator, the upper swing body is downsized. Yes. In particular, even in small hydraulic excavators, a rear ultra-small swivel type that is configured so that the upper revolving unit can swivel within the vehicle width dimension of the lower traveling unit so that it can swivel in a narrow work site. In a hydraulic excavator called a small turning type, the upper turning body is further miniaturized.

  In this case, the cab is downsized together with the upper swing body. In the downsized cab, since the indoor space is limited, it is difficult to arrange the storage case, and there is a problem that the removed lower front window cannot be easily arranged (stored).

  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 allow the lower front window removed from the front portion in a narrow cab box to be stored in an unobstructed position. Is to provide a construction machine cab.

  In order to solve the above-described problems, the present invention is a cab for a construction machine that is mounted on a construction machine and on which an operator is boarded to operate the machine, and includes a front part, a rear part, a left side part, a right side part, and A cab box formed in a box shape by a top surface portion, a lower front window attached to and removable from a lower side of the front portion of the cab box, and the cab located above the lower front window An upper front window provided in the front part of the box; a door provided in one of the left and right side parts for an operator to enter and exit the cab box; the door and the left and right A cab for a construction machine comprising a side window attached to the other side portion facing in a direction and a crosspiece attached to the inner position of the side window to extend forward and rearward to protect the operator. It is use.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the lower front window is overlapped on the side window with the lower front window removed from the front surface portion. In this configuration, a lower front window holding member for detachably holding the window is provided.

  According to a second aspect of the present invention, there is provided a structure in which a plurality of the crosspiece members are provided at intervals in the upward and downward directions, and the lower front window holding member is provided on a crosspiece member positioned on the uppermost side among the plurality of crosspiece members. It is to have done.

  According to a third aspect of the present invention, the lower frame portion positioned on the lower side of the frame member constituting the other side surface portion is provided with a lower front window lower end receiving the lower end of the lower front window, and the lower front The window holding member is located on the upper side of the lower front window lower end receiver and is provided on the crosspiece member.

  According to a fourth aspect of the present invention, a plurality of the crosspiece members are provided with an interval in the upward and downward directions, and the lower front window holding member is provided on a crosspiece member positioned on the lower side of the plurality of crosspiece members. A lower front window lower end holder that holds the lower end of the lower front window, and a lower front window upper end receiver that is provided on a cross member positioned above the lower front window lower end receiver and holds the upper end of the lower front window. There is.

  The invention of claim 5 is configured such that the lower front window holding member is formed as a bag suspended from the crosspiece member, and the lower front window removed from the front portion is stored in the bag. It is to have done.

  According to the first aspect of the present invention, the lower front window removed from the front portion of the cab box is held by the lower front window holding member, whereby the side window of the other side portion located on the opposite side of the door. Can be placed in a stacked state. In this case, since the lower front window holding member uses an existing crosspiece member provided to protect the operator, it can be easily provided with a simple configuration.

  As a result, even a small cab box used for a small construction machine, for example, can be stored so as not to obstruct the lower front window. In addition, since the lower front window is simply attached to the lower front window holding member, it can be easily stored and removed.

  According to the invention of claim 2, since the lower front window holding member is provided on the uppermost crosspiece member among the plurality of crosspiece members, the lower front window that is long in the upward and downward directions has a margin. Can be stored. Furthermore, the stored lower front window can be separated upward from devices, switches, and the like disposed around the driver's seat, and the workability of the operator can be improved.

  According to the invention of claim 3, since the lower front window holding member can hold the lower front window so as to be sandwiched between the lower front window lower end receiver, both the upper and lower parts of the lower front window are stably held. can do. As a result, the lower front window can be reliably held by the lower front window holding member and the lower front window lower end receiver even when vibration occurs during operation of the construction machine, and the reliability and the like can be improved. .

  According to the invention of claim 4, the lower front window lower end receiver and the lower front window upper end receiver constituting the lower front window holding member can be held so as to sandwich the lower front window. Both can be held stably. As a result, the lower front window can be reliably held by the lower front window lower end receiver and the lower front window upper end receiver even when vibration occurs during operation of the construction machine, and the reliability and the like can be improved. .

  According to the invention of claim 5, since the lower front window holding member is formed as a bag suspended from the crosspiece member, when the lower front window is not housed in the bag, the bag is folded small. And the side field of view can be improved.

It is a right view which shows the hydraulic excavator applied to the 1st Embodiment of this invention. It is a front view which shows a hydraulic excavator from the front side in the state which removed the working device. It is a left view which expands and shows a cab box. It is sectional drawing seen from the arrow IV-IV direction in FIG. 2 in the state which attached the lower front window removed from the front part of the cab box to the lower front window lower end receiver and the lower front window upper end receiver. It is sectional drawing of the principal part expansion which shows the upper right side window in FIG. 4, a crosspiece, a lower front window lower end receiver, a lower front window upper end receiver, a lower front window, etc. It is a perspective view of the principal part expansion which shows the state which hold | maintained the lower end of the lower front window with the lower front window lower end receptacle. It is sectional drawing seen from the arrow VII-VII direction in FIG. It is a principal part expansion perspective view which shows the state which hold | maintained the upper end of the lower front window by the lower front window upper end receptacle. It is sectional drawing seen from the arrow IX-IX direction in FIG. It is sectional drawing similar to FIG. 5 which shows the lower front window lower end receiver by the 2nd Embodiment of this invention with a right upper side window, a crosspiece, a lower front window upper end receiver, a lower front window, etc. It is sectional drawing similar to FIG. 5 which shows the lower front window lower end receiver by the 3rd Embodiment of this invention with a right upper side window, a crosspiece, a lower front window upper end receiver, a lower front window, etc. It is sectional drawing similar to FIG. 5 which shows the bag body by the 4th Embodiment of this invention with a right upper side window, a crosspiece, a lower front window, etc.

  The construction machine cab according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings, taking as an example a case where the cab is provided on a crawler hydraulic excavator.

  1 to 9 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine used for earth and sand excavation work or the like. The hydraulic excavator 1 is called a mini excavator having an operating mass of less than 6 tons, for example, and is an ultra-small turning hydraulic excavator in which the rear part of the upper turning body 4 is substantially within the vehicle width dimension of the lower traveling body 2 during turning operation. It is configured as. The hydraulic excavator 1 includes a self-propelled crawler type lower traveling body 2, an upper revolving body 4 provided on the lower traveling body 2 via a swivel device 3 so as to be capable of swiveling, and the upper revolving body 4. It is comprised with the working device 5 provided in the front side of this so that the raising / lowering movement was possible.

  The upper swing body 4 is mounted on the swing frame 6 which forms a support structure, a cab 11 which will be described later mounted on the left front side of the swing frame 6, and a rear side of the cab 11. , A building cover 7 that covers an engine, a hydraulic pump, a control valve, etc. (all not shown), and a weight balance with the work device 5 that is attached to the rear part of the revolving frame 6 located on the rear side of the building cover 7 And a counterweight 8 taking

  Next, the configuration of the cab 11 provided in the hydraulic excavator 1 will be described.

  Reference numeral 11 denotes a cab for the hydraulic excavator 1 as a cab for a construction machine mounted on the left front side of the revolving frame 6. The cab 11 is used by an operator to operate the excavator 1. The cab 11 includes a floor member 12, a cab box 13, a lower front window 24, an upper front window 25, a door 26, an upper right window 27, a crosspiece 29, and the like.

  A floor member 12 is provided on the revolving frame 6 and forms a bottom plate of the cab 11. The floor member 12 is formed as a rectangular plate that is long in the front and rear directions. The floor member 12 is disposed in a cab box 13 to be described later, and a plurality of locations including four corners thereof are supported by the revolving frame 6 via vibration-proof mounts (not shown). On the other hand, a step-shaped driver's seat mounting base 12A is provided on the rear side from the front and rear intermediate portions of the floor member 12.

  Reference numeral 13 denotes a cab box mounted on the floor member 12. The cab box 13 constitutes an outer shell of the cab 11 and defines a cab in which an operator is boarded. As shown in FIGS. 1 to 4, the cab box 13 includes a front surface portion 14 disposed on the front side in the front and rear directions, a rear surface portion 15 facing the front surface portion 14 in the front and rear directions, and a front surface portion 14. Further, the left side surface part 16 and the right side surface part 17 facing in the left and right directions across the rear surface part 15 and the top surface for closing the upper end side of the front surface part 14, the rear surface part 15, the left and right side parts 16 and 17 It is formed as a box body surrounded by the part 18.

  The front surface portion 14 is formed in a frame shape by a front window frame member 14A that opens in a rectangular shape elongated in the upward and downward directions (see FIG. 2). The front window frame member 14A has a sufficiently large lateral width and height, and thereby provides a sufficiently wide front field of view in the upward, downward, left, and right directions. The lower position of the front window frame member 14A is closed by a lower front window 24 described later, and the upper position is closed by an upper front window 25 described later. On the other hand, a rectangular frame-shaped rear window frame member 15A is formed at an upper position of the rear surface portion 15 (see FIG. 4). A rear window 19 made of, for example, a transparent glass plate is fitted into the rear window frame member 15A. The rear window 19 provides a rear view to the operator.

  The left side surface portion 16 is a door frame member 16A whose front side portion is open in a rectangular shape that is long in the upward and downward directions with respect to the middle portion in the front and rear directions (see FIG. 3). The opening in the door frame member 16 </ b> A serves as an entrance / exit 16 </ b> A <b> 1 for an operator to enter / exit into the cab box 13. The door frame member 16A is configured to be attached with a door 26 described later. Further, on the inner surface on the front end side of the left side portion 16, a lower front window 24 and a lower guide rail (both not shown) for guiding a lower front window 24 and an upper front window 25 described later are provided. Yes.

  Further, the rear side of the left side surface portion 16 is formed in a frame shape by the left window frame member 16B. The left window frame member 16B is fitted with a left window 20 made of, for example, a transparent glass plate (see FIG. 3). The left window 20 provides the operator with a left field of view.

  On the other hand, the upper side of the right side surface portion 17 is an upper right side window frame member 17A as a frame member that opens in a substantially rectangular shape over substantially the entire length in the front and rear directions. Further, a lower right window frame member 17B that opens in a substantially elliptical shape is formed on the front side of the right side portion 17 and below the upper right window frame member 17A. The upper right window frame member 17A is closed by an upper right window 27 described later, and the lower right window frame member 17B is closed by a lower right window 21. A lower guide rail 22 and an upper guide rail 23 which will be described later are provided on the inner surface on the front end side of the right side portion 17.

  Here, the lower frame portion 17C located on the lower side of the upper right side window frame member 17A has an inverted L-shaped attachment for fixing the lower end side of the upper right side window 27 described later, as shown in FIGS. A frame 17C1, an outer frame 17C2 fixed to the lower side of the mounting frame 17C1 by welding or the like and bent into a crank shape, and an inner frame side of the outer frame 17C2 fixed by welding or the like and bent into an L shape. And an inner frame 17C3. 4 and 5, the inner frame 17C3 of the lower frame portion 17C is provided with two lower front window lower end receivers 31 to be described later at intervals in the front and rear directions.

  Reference numeral 22 denotes left and right lower guide rails (only the right side is shown in FIG. 4) provided on the inner surfaces of the front end side of the left and right side portions 16 and 17 of the cab box 13, respectively. The left and right lower guide rails 22 are formed as recessed grooves having a U-shaped cross section that are open facing each other in the left and right directions. The lower guide rail 22 extends from the lower end side of the left and right side portions 16 and 17 to an intermediate position in the upper and lower directions. Here, the lower guide rail 22 is open at the upper end side, and the lower front window 24 is attached through this open portion and is detachably guided.

  Reference numeral 23 denotes a left and right upper guide rail (shown only on the right side in FIG. 4), which is located on the upper side of the lower guide rail 22 and provided on the inner surfaces of the left and right side portions 16 and 17, respectively. Yes. The left and right upper guide rails 23 are formed as recessed grooves having a U-shaped cross-section that are opened facing each other in the left and right directions, in substantially the same manner as the lower guide rail 22. The upper guide rail 23 is formed in a substantially L shape by extending upward from the position of the upper end of the lower guide rail 22 and then bending and extending rearward along the top surface portion 18. The upper guide rail 23 guides an upper front window 25 described later to a position where the upper portion of the front window frame member 14 </ b> A of the front surface portion 14 is closed and a position where it is stored below the top surface portion 18.

  Reference numeral 24 denotes a lower front window that is attached to the lower position of the front surface portion 14 and is detachable. The lower front window 24 is formed, for example, as a substantially rectangular transparent glass plate. The lower front window 24 is slidably fitted to the lower guide rail 22 at both left and right ends, and the lower end 24A is fitted to the lower side of the front window frame member 14A. Further, the upper end 24B of the lower front window 24 is in contact with the lower end of the upper front window 25 described later. Thereby, the lower front window 24 closes the lower position of the front surface portion 14.

  Furthermore, the lower front window 24 can be removed from the front surface portion 14 (the front window frame member 14A) by pulling upward from the lower guide rail 22. Thereby, air can be distribute | circulated between the inside of the cab box 13 and the exterior through the front window frame member 14A, and ventilation etc. can be performed. In this case, the lower front window 24 removed from the front window frame member 14 </ b> A faces the lower front window 24 so as to overlap the upper right window 27, and the lower front window upper end receiver 36 and the lower front window which will be described later. It is configured to be held by the lower end receiver 31.

  An upper front window 25 is provided on the front window frame member 14 </ b> A and is located on the upper side of the lower front window 24. The upper front window 25 has a substantially rectangular shape that is longer than the lower front window 24, for example. It is formed as a transparent glass plate. The upper front window 25 is supported by the upper guide rail 23 so that both ends in the left and right directions can be moved via guide rollers (not shown). As a result, the upper front window 25 extends upward and downward, closes the front window frame member 14A of the front surface portion 14, and the lower side of the top surface portion 18 extends forward and rearward. It is the structure which can move between the storage positions stored in.

  Reference numeral 26 denotes a door provided on the door frame member 16A of the left side surface portion 16 (see FIG. 3). The door 26 is opened and closed when the operator enters and exits the cab box 13, and the rear edge thereof is rotatably attached to the door frame member 16 </ b> A via a hinge portion 26 </ b> A. Thereby, the operator can get on and off through the entrance 16A1 of the cab box 13 with the door 26 opened. Further, the door 26 is provided with an upper door window 26B and a lower door window 26C with an interval in the upward and downward directions, and provides the operator with a left side view together with the left side window 20.

  Reference numeral 27 denotes an upper right side window as a side window provided in the right side surface portion 17. The upper right window 27 is fixed to the upper right window frame member 17A by a fixing member 28 made of double-sided tape, adhesive or the like, and closes the upper position of the right side portion 17. The upper right window 27 is provided to extend upward (widely) from the intermediate position in the upper and lower directions on the right side portion 17, thereby providing the right view to the operator.

  Reference numerals 29A and 29B denote a plurality of, for example, two upper and lower crosspieces which are attached to the inner position of the upper right side window 27 so as to extend in the front and rear directions (referred to as a crosspiece 29 as a whole). The crosspiece 29 is formed of a metal pipe (round bar) having strength, and the front end side and the rear end side are attached to the upper right window frame member 17A (right side surface portion 17).

  The upper crosspiece member 29A and the lower crosspiece member 29B are provided at predetermined intervals in the upper and lower directions. Thereby, the crosspiece member 29 is protecting the operator who seated in the driver's seat 41 mentioned later. That is, the crosspiece member 29 can prevent the rocks and the like from entering the cab box 13 even when an obstacle such as a rock collides with the upper right window 27 and the upper right window 27 is damaged. Moreover, the crosspiece member 29 can prevent an operator from putting out a hand or a head from the upper right side window 27 in a state where the upper right side window 27 is broken.

  Each block member 29A, 29B is provided with two block bodies 30 at intervals in the front and rear directions, respectively. Each block body 30 is formed of, for example, an elastic rubber material or the like, and is in contact with the inner surface of the upper right side window 27 as shown in FIG. Thereby, each block body 30 forms a predetermined gap between the crosspiece members 29 </ b> A and 29 </ b> B and the upper right side window 27. As a result, each block body 30 can absorb the vibration even when the upper right window 27 vibrates, for example, and suppresses the generation of abnormal noise.

  Reference numeral 31 denotes a lower front window lower end receiver provided on the lower frame portion 17C located on the lower side of the upper right window frame member 17A constituting the right side surface portion 17. The lower front window lower end receiver 31 holds the lower end 24 </ b> A of the lower front window 24 when the lower front window 24 removed from the front surface portion 14 is placed on the upper right side window 27. Two lower front window lower end receivers 31 are provided on the lower frame portion 17 </ b> C with an interval smaller than the width dimension of the lower front window 24. As shown in FIGS. 6 and 7, the lower front window lower end receiver 31 includes a holding plate 32, a presser plate 33, and an engagement elastic body 35.

  The holding plate 32 is attached to the upper end side of the inner frame 17C3 of the lower frame portion 17C by welding or the like, and left and right from the upper end of the mounting plate portion 32A to the left side (driver's seat 41 side). A horizontal plate portion 32B extending toward the upper side and a protruding plate portion 32C extending upward from the left end of the horizontal plate portion 32B are formed as a bent plate of the crank.

  The presser plate 33 is formed of a rectangular parallelepiped plate that is long in the front and rear directions. The presser plate 33 faces the protruding plate portion 32C and faces the left and right sides (upper right window 27 side) on the horizontal plate portion 32B. It is fixed by welding or the like. The distance between the protruding plate portion 32 </ b> C and the presser plate 33 is set to be larger than the thickness of the lower front window 24. The space surrounded by the horizontal plate portion 32B, the protruding plate portion 32C, and the presser plate 33 is a substantially U-shaped or substantially U-shaped elastic body mounting recess 34 that opens upward.

  The engagement elastic body 35 is formed in, for example, a substantially U-shape or a substantially U-shape with an upper portion opened by a rubber material or the like, and is fixed in the elastic body mounting recess 34. On both left and right ends of the engagement elastic body 35, there are provided folded portions 35A that are folded inward from the upper end side. The clearance dimension on the tip side of the folded portion 35 </ b> A facing each other in the left and right directions is set to be slightly smaller than the thickness dimension of the lower front window 24.

  Thereby, when the lower end 24A of the lower front window 24 is engaged in the engagement elastic body 35, the lower front window 24 can be sandwiched by the folded portions 35A. As a result, the frictional resistance between the lower front window 24 and the engagement elastic body 35 (the folded portion 35A) can be increased, so that the lower front window 24 can be stably held. Therefore, the engagement elastic body 35 can be reliably held so that the lower front window 24 is not displaced from the lower front window lower end receiver 31 due to, for example, vibration of the hydraulic excavator 1.

  Reference numeral 36 denotes a lower front window upper end receiver as a lower front window holding member provided at an intermediate position of the upper rail member 29A located on the upper side. The lower front window upper end receiver 36 is arranged above the lower front window lower end receiver 31 and above the lower front window 24 by an amount equivalent to the downward dimension (height dimension). The lower front window upper end receiver 36 holds the upper end 24 </ b> B of the lower front window 24 in a state where the lower front window 24 removed from the front surface portion 14 is overlapped with the upper right window 27. The lower front window upper end receiver 36 includes a mounting plate 37 and a clamping member 38.

  The mounting plate 37 includes a lower plate portion 37A attached to the upper crosspiece member 29A, an inclined plate portion 37B inclined from the upper end of the lower plate portion 37A toward the right side (upper right side window 27 side), and the inclined plate portion 37B. And an upper plate portion 37C to which a clamping member 38 is attached extending upward from the upper end. The attachment plate 37 is fixed to the upper crosspiece member 29A by attaching the lower plate portion 37A to the upper crosspiece member 29A with bolts 39. The lower plate portion 37A may be configured to be attached to the upper crosspiece member 29A by welding or the like. The upper plate portion 37C is provided with three female screw holes 37C1 (only two are shown in FIG. 9).

  The clamping member 38 is formed as a so-called clip that holds the lower front window 24 by sandwiching the upper end 24 </ b> B of the lower front window 24. The clamping member 38 is formed of, for example, a metal member, a resin member, or the like, and is provided at a position between the two lower front window lower end receivers 31 and in a position corresponding to the lower front window lower end receiver 31 in the upper and lower directions. . As shown in FIGS. 8 and 9, the holding member 38 includes an upper step portion 38A, a middle step portion 38B, a lower step portion 38C, and a lower front window holding portion 38D.

  The upper step portion 38A is disposed above the intermediate position in the upper and lower direction of the sandwiching member 38 and at intervals in the front and rear directions. Bolt insertion holes 38E are formed in the front and rear upper stage portions 38A, respectively. The two bolt insertion holes 38E correspond to the two female screw holes 37C1 located on the upper side of the mounting plate 37.

  The middle step portion 38B is disposed below the intermediate position in the upper and lower direction of the clamping member 38 and at intervals in the front and rear directions. The front and rear middle step portions 38B are formed as flat surfaces that are lowered by one step from the lower end side of the upper step portion 38A toward the right side (mounting plate 37 side) with the same dimension as the thickness of the lower front window 24. Each middle step portion 38B fixes the lower front window 24 with the upper end 24B of the lower front window 24 between the lower front window holding portion 38D when the lower front window 24 is held by the holding member 38.

  The lower step portion 38C is located in the middle between the front and rear directions of the clamping member 38. That is, the lower step portion 38C is located between the upper step portion 38A and the middle step portion 38B located on both ends in the front and rear directions, and is lowered by one step from the middle step portion 38B. A bolt insertion hole 38E is formed in the lower step portion 38C at a position corresponding to the female screw hole 37C1 located at the lower end of the upper plate portion 37C. The clamping member 38 can be integrally attached to the mounting plate 37 by screwing the bolts 40 inserted into the respective bolt insertion holes 38E into the respective female screw holes 37C1 of the mounting plate 37.

  The lower front window clamping portion 38D is positioned between the front and rear upper step portions 38A. The lower front window clamping portion 38D is provided on a thin plate-like leaf spring portion 38D1 extending from the upper side of the bolt insertion hole 38E of the lower step portion 38C toward the left side (driver's seat 41 side), and the distal end side of the leaf spring portion 38D1. And a lower front window pressing portion 38D2. The lower front window pressing portion 38D2 protrudes toward the left side from the upper step portion 38A, and the distance between the lower front window pressing portion 38D2 and the middle step portion 38B in the left and right directions is the thickness of the lower front window 24. It is formed slightly smaller than the size.

  Accordingly, when the upper end 24B of the lower front window 24 is sandwiched between the middle step portion 38B and the lower front window pressing portion 38D2, the leaf spring portion 38D1 presses the lower front window pressing portion 38D2 against the lower front window 24. The front window 24 can be stably held.

  Reference numeral 41 denotes a driver seat provided on the driver seat mounting base 12A in the cab 11, and this driver seat 41 is seated by an operator. Around the driver's seat 41, there are provided an operation lever 42 for operating the working device 5 and the like, a travel lever / pedal for operating the lower traveling body 2, and various switches (none of which are shown).

  The hydraulic excavator 1 equipped with the cab 11 according to the first embodiment has the above-described configuration. Next, the operation thereof will be described.

  First, the operator gets into the cab 11 and sits in the driver's seat 41, and operates the left and right travel levers and pedals (not shown) to travel the excavator 1 to the work place. Then, the operator can drive the turning device 3 and the work device 5 by operating the left and right operation levers 42 to perform soil excavation work and the like.

  Next, the case where ventilation is performed in order to adjust the temperature, humidity, etc. in the cab 11 will be described.

  First, the upper front window 25 is slid upward along the upper guide rail 23 and stored in the lower side of the top surface portion 18 while extending in the front and rear directions. Further, the lower front window 24 is removed from the front portion 14 of the cab box 13 by sliding the lower front window 24 upward along the lower guide rail 22. Thereby, the front surface part 14 of the cab box 13 can be opened to the outside, and the outside air can be taken into the cab box 13.

  Here, the lower front window 24 removed from the front surface portion 14 of the cab box 13 has a lower front window lower end receiving portion 31 and a lower front window upper end receiving portion 36 that are provided on the right side portion 17 and the left, It can be stored in a stacked state in the right direction. Specifically, with the removed lower front window 24 facing the upper right window 27, the lower end 24A of the lower front window 24 is engaged with the two lower front window lower end receivers 31 provided on the lower frame portion 17C. It is inserted into the elastic body 35. In this state, the upper end 24B of the lower front window 24 is sandwiched between the middle step portion 38B of the clamping member 38 of the lower front window upper end receiver 36 provided on the upper rail member 29A and the lower front window pressing portion 38D2.

  In this case, the folded portion 35A of the engagement elastic body 35 of the lower front window lower end receiver 31 can sandwich the lower end 24A of the lower front window 24 with an elastic force, and can be stably supported with a large frictional resistance. Further, the lower front window holding portion 38D of the holding member 38 of the lower front window upper end receiver 36 holds the upper end 24B side of the lower front window 24 by the urging force of the leaf spring portion 38D1 and the middle step portion 38B of the holding member 38 and the lower front window presser. It can be securely held between the portion 38D2.

  As a result, the lower front window 24 is stably held at the three positions of the two lower front window lower end receivers 31 and the lower front window upper end receiver 36 in a state where the lower front window 24 is disposed inside the crosspiece member 29. It has a configuration. Further, since the lower front window 24 is stored in a state of being superimposed on the upper right window 27, the right field of view can be obtained through the lower front window 24. Further, since a crosspiece member 29 is disposed between the lower front window 24 and the upper right window 27, for example, even when the excavator 1 vibrates, the lower front window 24 and the upper right window 27 are separated from each other. It can be made into the state which carried out.

  On the other hand, when the lower front window 24 is removed from the lower front window lower end receiver 31 and the lower front window upper end receiver 36, the upper end side of the lower front window pressing portion 38D2 of the lower front window upper end receiver 36 (the clamping member 38) is pushed. Thus, the leaf spring portion 38D1 is elastically deformed to release the engagement (engagement) on the upper end 24B side of the lower front window 24 sandwiched between the middle step portion 38B and the lower front window pressing portion 38D2. Then, the lower front window 24 can be detached from the engagement elastic body 35 of the lower front window lower end receiver 31 by moving it upward while pulling it toward the front (left side).

  Thus, according to the first embodiment, the lower front window 24 removed from the front surface portion 14 of the cab box 13 is positioned on the opposite side of the door 26 by being held by the lower front window upper end receiver 36. It can arrange | position in the state piled up on the upper right side window 27 of the right side surface part 17 to do. In this case, the lower front window upper end receiver 36 uses the existing crosspiece member 29 provided to protect the operator, and thus can be easily provided with a simple configuration.

  As a result, even if the cab box 13 is a small one used for the small hydraulic excavator 1, for example, the lower front window 24 can be stored so as not to get in the way. Moreover, since the lower front window 24 is simply attached to the lower front window upper end receiver 36, it can be easily accommodated and removed.

  Further, since the lower front window upper end receiver 36 is provided on the upper beam member 29A located on the upper side of the plurality of beam members 29A and 29B, the lower front window 24 that is long in the upward and downward directions is stored with a margin. can do. Furthermore, the stored lower front window 24 can be separated upward from the devices, switches, and the like disposed around the driver's seat 41, and the operator's workability can be improved.

  Furthermore, since the lower front window upper end receiver 36 can hold the lower front window 24 so as to be sandwiched between the lower front window lower end receiver 31, both the upper and lower portions of the lower front window 24 can be stably held. it can. As a result, the lower front window 24 can be securely held by the lower front window upper end receiver 36 and the lower front window lower end receiver 31 even when vibration is generated during operation of the hydraulic excavator 1, thereby improving reliability and the like. can do.

  Next, FIG. 10 shows a second embodiment of the present invention. The feature of this embodiment is that a lower front window lower end receiver is provided on a lower one of the two cross members. In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  Reference numeral 51 denotes a lower front window holding member provided on the crosspiece member 29, and the lower front window holding member 51 has a lower front window 24 in a state where the lower front window 24 removed from the front surface portion 14 is superimposed on the upper right side window 27. The window 24 is attached and is detachably held. The lower front window holding member 51 includes a lower front window lower end receiver 52 and a lower front window upper end receiver 53 which will be described later.

  Reference numeral 52 denotes a lower front window lower end receiver used in place of the lower front window lower end receiver 31 according to the first embodiment. The lower front window lower end receiver 52 is provided on the lower crosspiece member 29B located on the lower side. The lower front window lower end receiver 52 is made of a metal material having a C-shaped cross section or a U-shaped cross section, and is disposed in a U shape so as to hold the lower end 24 </ b> A side of the lower front window 24.

  That is, the lower front window lower end receiver 52 includes a vertical frame 52A that sandwiches the lower front window 24 in the front and rear directions, and a horizontal frame 52B that extends in the front and rear directions across the lower ends of the vertical frames 52A. ing. The upper ends of the vertical frames 52A are fixed to the lower crosspiece member 29B by welding or the like. Further, an engagement elastic body (not shown) formed of a rubber material or the like is fixed in each of the frames 52A and 52B, and the lower end 24A side of the lower front window 24 is engaged with the engagement elastic body. It has become.

  Reference numeral 53 denotes a lower front window upper end receiver as a lower front window holding member according to the second embodiment provided on the upper bar member 29A. The lower front window upper end receiver 53 has the same configuration as the lower front window upper end receiver 36 according to the first embodiment.

  Thus, also in the second embodiment configured as described above, substantially the same operations and effects as the first embodiment described above can be achieved. In particular, in the second embodiment, the lower front window lower end receiver 52 is provided on the lower rail member 29B positioned on the lower side, and the lower front window upper end receiver 53 is positioned above the lower rail member 29B. Since it is provided at 29A, there is no need to process the right side surface portion 17 of the cab box 13 or the upper right side window 27. Thereby, the lower front window 24 can be easily accommodated in the cab box 13 without changing the arrangement of devices and apparatuses in the cab box 13.

  Next, FIG. 11 shows a third embodiment of the present invention. The feature of this embodiment is that three crosspiece members are provided at the inner position of the upper right window. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  Reference numerals 61A, 61B, and 61C denote a plurality of, for example, three crosspieces that are attached so as to extend in the front and rear directions inside the upper right window 27 (referred to as crosspieces 61 as a whole). The crosspiece member 61 is formed of, for example, a metal pipe (round bar) or the like, similar to the crosspiece members 29A and 29B according to the first embodiment, and the front end side and the rear end side are the upper right side window frame member 17A (right side). It is attached to the surface part 17). The upper crosspiece member 61A, the middle crosspiece member 61B, and the lower crosspiece member 61C are sequentially arranged from the upper side with an interval in the upward and downward directions. Thereby, the crosspiece member 61 protects the operator seated on the driver's seat 41.

  Reference numeral 62 denotes a lower front window holding member provided on the crosspiece member 61. The lower front window holding member 62 has a lower front window 24 in a state where the lower front window 24 removed from the front surface portion 14 is superimposed on the upper right window 27. The window 24 is attached and is detachably held. The lower front window holding member 62 includes a lower front window lower end receiver 63 and a lower front window upper end receiver 64 which will be described later.

  Reference numeral 63 denotes a lower front window lower end receiver used in place of the lower front window lower end receiver 31 according to the first embodiment. The lower front window lower end receiver 63 has the same configuration as that of the lower front window lower end receiver 31 according to the first embodiment, and the lower front window lower end receiver 63 is located on the lowermost side with an interval smaller than the width dimension of the lower front window 24. Two pieces are provided on the crosspiece member 61C. The lower front window lower end receiver 63 has a holding plate 63A fixed to the lower beam member 61C by welding or the like.

  Reference numeral 64 denotes a lower front window upper end receiver as a lower front window holding member according to the third embodiment provided on the upper bar member 61A. The lower front window upper end receiver 64 has the same configuration as the lower front window upper end receiver 36 according to the first embodiment.

  Thus, also in the third embodiment configured as described above, the same operations and effects as those of the first embodiment described above can be achieved. In particular, in the third embodiment, the lower front window upper end receiver 64 is provided on the upper beam member 61A located on the uppermost side of the plurality of beam members 61. The front window 24 can be stored with a margin. Furthermore, the stored lower front window 24 can be separated upward from the devices, switches, and the like disposed around the driver's seat 41, and the operator's workability can be improved.

  Next, FIG. 12 shows a fourth embodiment of the present invention. The feature of this embodiment is that the lower front window holding member is formed as a bag suspended from the crosspiece member. Note that in the fourth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  Reference numeral 71 denotes a bag body as a lower front window holding member suspended from the upper crosspiece member 29A. The bag body 71 is a durable transparent or permeable resin material that can sufficiently withstand the weight of the lower front window 24, for example, a transparent resin sheet embedded with a string (wire) having strength, It is formed of a braided braided body. And the bag body 71 is comprised by the attaching part 71A attached to the upper crosspiece member 29A so that attachment or detachment is possible, and the bag part 71B attached to the lower end side of this attaching part 71A. Two mounting portions 71A are provided in the front and rear directions of the upper crosspiece member 29A with an interval. Each attachment portion 71A is detachably attached so as to be hung on the upper rail member 29A.

  The bag portion 71B is formed in a size that can accommodate the lower front window 24 therein. Further, the upper end side of the bag portion 71B is opened, and fasteners (slide fasteners) (not shown) are provided on both front and rear ends. And the lower front window 24 removed from the front surface part 14 becomes a structure which can be accommodated in the inside of the bag part 71B by opening the fastener of the bag part 71B. In this case, since the bag portion 71B is formed of a material that can be seen through, even if the bag portion 71B is suspended from the upper rail member 29A, the right field of view of the operator can be ensured satisfactorily.

  Thus, also in the fourth embodiment configured as described above, the same operations and effects as those of the above-described first embodiment can be achieved. In particular, in the fourth embodiment, when the lower front window 24 is not housed in the bag portion 71B, the bag body 71 can be folded small to be compact. In this case, for example, with the attachment portion 71A attached to the upper crosspiece member 29A, the bag portion 71B is folded, or the attachment portion 71A is removed from the upper crosspiece member 29A, and the bag body 71 is folded small. It can be accommodated in one corner of the cab 11.

  In the above-described first embodiment, the case where the crosspiece member 29 is configured to include the upper crosspiece member 29A and the lower crosspiece member 29B has been described as an example. However, the present invention is not limited to this. For example, three or more crosspiece members may be used. In this case, the lower front window can be easily attached to the lower front window holding member by providing the lower front window holding member on the uppermost crosspiece member. Moreover, the number of crosspiece members may be one, and the crosspiece member may be provided with a lower front window holding member. These can be similarly applied to the fourth embodiment.

  Further, in the first embodiment described above, the case where the lower front window upper end receiver 36 that holds the upper end 24B of the lower front window 24 is provided as the lower front window holding member on the upper rail member 29A has been described as an example. . However, the present invention is not limited to this, and for example, a lower front window holding member that holds the front end and / or rear end of the lower front window may be provided on the crosspiece member.

  In the first embodiment described above, the lower front window upper end receiver 36 as a lower front window holding member that holds the upper end 24B of the lower front window 24 and the lower front window that holds the lower end 24A of the lower front window 24. The case where the lower end support 31 is provided has been described as an example. However, the present invention is not limited to this. For example, the upper front window may be firmly held only by the lower front window upper end receiver without providing the lower front window lower end receiver.

  In the above-described first embodiment, the case where one lower front window upper end receiver 36 is provided on the upper crosspiece member 29A has been described as an example. However, the present invention is not limited to this. For example, two or more lower front window upper end receivers may be provided. The same applies to the second and third embodiments.

  Further, in the above-described embodiment, the cab 11 mounted on the crawler excavator 1 as a cab for construction machines has been described as an example. However, the present invention is not limited to this, and can be widely applied to other construction machine cabs mounted on, for example, a wheel-type hydraulic excavator, a hydraulic crane, or the like.

11 cab for construction machine 13 cab box 14 front part 15 rear part 16 left side part 17 right side part 17C lower frame part 18 top part 24 lower front window 24A lower end 24B upper end 25 upper front window 26 door 27 upper right side window (side window)
29 Crosspiece member 29A Upper crosspiece member 29B Lower crosspiece member 31 Lower front window lower end receiver 36, 53, 64, Lower front window upper end receiver (lower front window holding member)
51, 62 Lower front window holding member 52, 63 Lower front window lower end receiver 61 Cross member 61A Upper cross member 61B Middle cross member 61C Lower cross member 71 Bag (lower front window holding member)

Claims (5)

A cab for a construction machine mounted on a construction machine and on which an operator boarded to operate the machine,
A cab box formed in a box shape by a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion, and a top surface portion, and a lower front that is detachably provided and attached to the lower side of the front surface portion of the cab box A window, an upper front window provided on the front part of the cab box above the lower front window, and one of the left and right side parts for an operator to enter and exit the cab box. A door provided on the side surface, a side window attached to the other side surface facing the door in the left and right directions, and extending in the front and rear directions to the inner position of the side window to protect the operator A cab for a construction machine comprising a crosspiece attached to
The cross member is configured to include a lower front window holding member that attaches the lower front window in a state where the lower front window removed from the front portion overlaps the side window and holds the lower front window in a removable manner. A cab for construction machinery. A plurality of the crosspiece members are provided at intervals in the upward and downward directions,
The cab for a construction machine according to claim 1, wherein the lower front window holding member is provided on a crosspiece member positioned on the uppermost side among the plurality of crosspiece members. The lower frame portion located on the lower side of the frame member constituting the other side surface portion is provided with a lower front window lower end receiving the lower end of the lower front window,
The cab for construction machinery according to claim 1 or 2, wherein the lower front window holding member is provided on the crosspiece member so as to be positioned above the lower front window lower end support. A plurality of the crosspiece members are provided at intervals in the upward and downward directions,
The lower front window holding member is provided on a lower beam member among the plurality of beam members, and a lower front window lower end holder that holds the lower end of the lower front window, and the lower front window lower end receiver. The cab for construction machines according to claim 1, comprising a lower front window upper end receiver provided on a crosspiece member positioned above to hold an upper end of the lower front window.   The lower front window holding member is formed as a bag body suspended from the crosspiece member, and the lower front window removed from the front portion is stored in the bag body. The cab for construction machinery as described.

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