Cab for construction machinery

Abstract

A monitor device (21), which is provided in a cab box (15) and which displays various information, is attached to a front window (18). The monitor device (21) is thereby configured so as to move, along with the movement of the front window (18), between a window-closing position of being accommodated in a window frame (16) of the cab box (15) and closing an opening (16A), and a window-opening position of being stowed below a top surface part (15E) of the cab box (15).

Description

Technical Field

[0001] The present invention relates to a cab for construction machinery provided with an opening / closing front window, for example, on a hydraulic excavator, a hydraulic crane, etc.

Background Art

[0002] A hydraulic excavator as a construction machine is composed of a lower traveling body capable of self-propulsion, an upper slewing body rotatably provided on the lower traveling body, and a working device rotatably provided on the front side of the upper slewing body.

[0003] The upper slewing body is provided with a cab in which an operator rides. This cab for a hydraulic excavator includes a cab box having an opening formed on the front side, a front window that is provided in the cab box and is movable between a closed window position for closing the opening and an open window position stored under the top surface portion of the cab box, and a monitor device provided in the cab box for displaying various information including an image of the surroundings photographed by a camera. A driver's seat on which the operator sits is provided in the cab box (Patent Document 1).

[0004] The monitor device is provided at a position where it does not interfere with the operator sitting on the driver's seat when looking ahead and is within the field of view. Also, the monitor device is provided at a position that does not compress the space inside the cab. Specifically, the monitor device is attached to a pillar at the right front of the cab box. Further, the monitor device is rotatably attached to the right front pillar via a support member. Thereby, the monitor device of Patent Document 1 can adjust the attachment angle so that the moving front window and the monitor device do not interfere with each other when opening and closing the front window.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] By the way, the monitor device according to Patent Document 1 adjusts the mounting angle of the monitor device when opening and closing the front window so that the front window does not interfere. However, it is conceivable that the operator is not aware that it is necessary to adjust the mounting angle of the monitor device when opening and closing the front window. In this case, there is a risk that the front window contacts the monitor device during the opening and closing operation of the front window, damaging the monitor device.

[0007] In addition, the monitor device is located near the right side of the opening of the cab box. Therefore, when the front window is open, rainwater, dust, sediment, etc. that enter from the opening may hit the monitor device. In this case, there are problems such as the monitor device malfunctioning or getting dirty.

[0008] The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a cab for construction machinery that can prevent contact with the front window that moves during opening and closing, and contact of rainwater, sediment, etc. that enter the cab box with the monitor device, and can improve the durability and visibility of the monitor device.

[0009] In a cab for construction machinery including a cab box having an opening formed on the front side, a front window provided in the cab box and movable between a closed window position for closing the opening and an open window position stored under the top surface portion of the cab box, and a monitor device provided in the cab box for displaying various information, the monitor device is attached to the front window and moves between the closed window position and the open window position as the front window moves.

[0010] According to the present invention, it is possible to prevent contact with the front window that moves during opening and closing, and contact of rainwater, sediment, etc. that enter the cab box with the monitor device, and it is possible to improve the durability and visibility of the monitor device.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0012] Hereinafter, as a cab for a construction machine according to an embodiment of the present invention, a cab mounted on a crawler-type hydraulic excavator will be taken as an example and described in detail with reference to FIGS. 1 to 6.

[0013] In FIG. 1, a hydraulic excavator 1 as a construction machine includes a lower traveling body 2 capable of self-propulsion, an upper revolving body 3 rotatably provided on the lower traveling body 2, and a swing-type working device 4 rotatably provided on the front side of the upper revolving body 3. The working device 4 performs earth and sand excavation work and the like.

[0014] A cab 11 as a cab for a construction machine is provided on the front side of the upper revolving body 3. As shown in FIGS. 2 and 3, the cab 11 includes a floor member 12, a driver's seat 13, a working lever device 14, a cab box 15, a front window 18, a flexible joint 20, and a monitor device 21, which will be described later.

[0015] The floor member 12 constitutes the base of the cab 11. The rear side of the floor member 12 rises in a step shape, and this step portion serves as a driver's seat pedestal 12A. In addition, a cab box 15 is attached around the floor member 12.

[0016] The driver's seat 13 is provided on the driver's seat pedestal 12A of the floor member 12. As a result, the driver's seat 13 is disposed within the cab box 15. The driver's seat 13 includes a seating surface 13A on which the operator sits and a backrest 13B that rises from the rear portion of the seating surface 13A.

[0017] The working lever device 14 is provided on both the left and right sides of the driver's seat 13 (only the left side is shown in the figure). The working lever device 14 is operated by the operator when operating the working device 4 and the like. Also, the traveling lever and pedal device (not shown) is operated by the operator when driving the lower traveling body 2 and is provided on the front side of the floor member 12.

[0018] The cab box 15 is provided above the floor member 12. The cab box 15 forms the outer shell of the cab 11 and forms a driver's cab inside. As shown in FIGS. 1 to 3, the cab box 15 is formed in a box shape by a front surface portion 15A, a rear surface portion 15B, a left surface portion 15C, a right surface portion 15D, and a top surface portion 15E. Further, the cab box 15 includes a left front pillar 15F provided to extend vertically at the boundary position (left front corner portion) between the front surface portion 15A and the left surface portion 15C, and a right front pillar 15G provided to extend vertically at the boundary position (right front corner portion) between the front surface portion 15A and the right surface portion 15D. Furthermore, the left surface portion 15C of the cab box 15 has an entrance / exit 15H that opens as a front side portion from the intermediate portion in the front-rear direction. This entrance / exit 15H is opened and closed by a door 15J.

[0019] The window frame 16 forms a part of the cab box 15 and is provided on the front surface portion 15A of the cab box 15. The window frame 16 is formed as a rectangular frame body that is slightly smaller than the front surface portion 15A. The window frame 16 is formed using the entire front surface portion 15A of the cab box 15. As a result, the left end edge of the window frame 16 is attached to the left front pillar 15F. The right end edge is attached to the right front pillar 15G. The window frame 16 is provided with a rectangular opening 16A over its entire surface. This opening 16A can be closed by a front window 18 described later.

[0020] The guide rails 17 are provided on the left front pillar 15F and the right front pillar 15G of the cab box 15 (only the right side is shown in the figure). The left and right guide rails 17 are formed as concave grooves arranged opposite to each other in the left - right direction. The left and right guide rails 17 extend vertically along the window frame 16 (left front pillar 15F, right front pillar 15G), and then bend rearward at the upper part and extend horizontally along the lower surface of the top surface portion 15E. The roller 18E of the front window 18 is movably fitted into the guide rail 17. Thereby, the guide rail 17 can guide the front window 18 to the closed - window position and the open - window position described later.

[0021] The front window 18 is provided in the cab box 15. The front window 18 is movable between a closed - window position (the position shown in FIG. 2) where it is housed in the window frame 16 and closes the opening 16A, and an open - window position (the position shown in FIG. 3) where it is stored below the top surface portion 15E. At the open - window position of the front window 18, the opening 16A of the window frame 16 is opened.

[0022] As shown in FIGS. 4 to 6, in the closed - window position, the front window 18 includes a window glass 18A made of a vertically long rectangular glass plate, a left frame portion 18B attached to the left side of the window glass 18A and extending vertically along the left side, a right frame portion 18C attached to the right side of the window glass 18A and extending vertically along the right side, a lower frame portion 18D attached to the lower side of the window glass 18A and extending horizontally along the lower side, and rollers 18E provided at both ends of the left frame portion 18B and both ends of the right frame portion 18C. The roller 18E is movably fitted into the guide rail 17. Thereby, the front window 18 can move correctly between the closed - window position and the open - window position as the roller 18E is guided by the guide rail 17.

[0023] In addition, the front window 18 has a plurality of, for example, three C-shaped handles 18F, 18G, and 18H. At the closed window position of the front window 18, the handle 18F is provided to protrude into the cab 11 at an upper position of the left frame portion 18B (an upper position than the middle portion in the length direction). The handle 18G is provided to protrude into the cab 11 at an upper position of the right frame portion 18C (an upper position than the middle portion in the length direction). The handle 18H is provided to protrude into the cab 11 at a left side position of the lower frame portion 18D. The handles 18F, 18G, and 18H are grasped when opening and closing the front window 18. Thereby, the operator can easily move the front window 18 with a light force by grasping the handles 18F, 18G, and 18H when opening and closing the front window 18.

[0024] Furthermore, as shown in FIG. 6, a bracket 18J is provided to protrude into the cab 11 on the right frame portion 18C of the front window 18. The bracket 18J is formed of a plate body and is integrally attached in the vicinity of the lower side of the handle 18G (the middle position in the vertical direction of the right frame portion 18C). A universal joint 20 (monitor device 21) is attached to this bracket 18J.

[0025] As shown in FIGS. 1 to 3, the camera device 19 is provided at the upper part on the rear side of the cab 11. The camera device 19 is constituted by, for example, a CCD camera or the like. The camera device 19 photographs a range behind the hydraulic excavator 1 that is a blind spot for the operator in the cab 11. The video photographed by the camera device 19 is displayed on the monitor device 21 in the cab 11.

[0026] As shown in FIGS. 4 and 5, the universal joint 20 is provided on the right frame portion 18C of the front window 18. The universal joint 20 constitutes a connecting member and can adjust the angle when attaching the monitor device 21 described later to the front window 18. The universal joint 20 is provided at an intermediate position in the longitudinal direction (vertical direction) of the right frame portion 18C near the lower side of the handle 18G, that is, on the bracket 18J. The universal joint 20 has a configuration in which, for example, two spherical bodies are sandwiched between two concave spherical surface portions, and a screw member is used to press the concave spherical surface portions against the spherical bodies. One end of the universal joint 20 is attached to the bracket 18J of the right frame portion 18C of the front window 18. On the other hand, a monitor device 21 described later is attached to the other end of the universal joint 20.

[0027] The universal joint 20 can allow the mounting angle of the monitor device 21 to be changed by loosening the screw member to reduce the frictional force between the spherical body and the concave spherical surface portion. Further, when the mounting angle of the monitor device 21 is determined, the mounting angle of the monitor device 21 can be fixed by tightening the screw member to increase the frictional force between the spherical body and the concave spherical surface portion. Thereby, the universal joint 20 can direct the screen 21A of the monitor device 21 toward the operator sitting on the driver's seat 13 whether the front window 18 is in the closed window position or the open window position.

[0028] The monitor device 21 is provided in the cab box 15. The monitor device 21 displays various information such as an image of the rear of the hydraulic excavator 1 photographed by the camera device 19. The monitor device 21 is wired-connected or wirelessly-connected to a controller (not shown) using a cable or the like.

[0029] The monitor device 21 includes, for example, a rectangular screen 21A on the front side. The rear side of the monitor device 21 is attached to the other end of the universal joint 20. That is, the monitor device 21 is attached to the front window 18 via the universal joint 20. Thereby, the monitor device 21 can move between the closed window position and the open window position as the front window 18 moves.

[0030] The monitor device 21 is attached to the right frame portion 18C of the front window 18 via a flexible joint 20. As a result, the monitor device 21 is disposed on the other side in the left-right direction, which is the side opposite to the boarding and alighting opening 15H of the cab box 15, that is, on the right frame portion 18C of the front window 18. Therefore, the monitor device 21 is disposed at a position where it does not get in the way when boarding and alighting through the boarding and alighting opening 15H.

[0031] Further, the monitor device 21 is provided at an intermediate position in the longitudinal direction (vertical direction) of the right frame portion 18C of the front window 18. At the closed window position of the front window 18 shown in FIG. 2, the position of the monitor device 21 is such that it naturally enters the field of view without getting in the way when the operator sitting on the driver's seat 13 visually observes the front, and does not compress the space inside the cab 11.

[0032] On the other hand, at the open window position (stored position) of the front window 18 shown in FIG. 3, the monitor device 21 is located in front of the backrest 13B of the driver's seat 13. Thus, the monitor device 21 at the open window position can be visually recognized when the operator sitting on the driver's seat 13 visually observes the front or when the line of sight is slightly shifted to the right.

[0033] Moreover, as described above, due to the function of the flexible joint 20, the monitor device 21 can direct the screen 21A of the monitor device 21 toward the operator sitting on the driver's seat 13 whether the front window 18 is in the closed window position or the open window position.

[0034] Furthermore, when the front window 18 is opened and the opening 16A of the window frame 16 is opened, the monitor device 21 is disposed below the top surface portion 15E of the cab box 15 together with the front window 18. Therefore, even if rainwater, dust, earth and sand, etc. enter the cab 11 from the opening 16A of the window frame 16, it is difficult for rainwater, dust, earth and sand, etc. to adhere to the monitor device 21. Thereby, it is possible to prevent rainwater from entering the monitor device 21 and causing a failure, or the screen 21A from being soiled by rainwater, dust, earth and sand, etc.

[0035] The hydraulic excavator 1 to which this embodiment is applied has the configuration as described above, and next, its operation will be described.

[0036] First, the operator can board the cab 11, sit on the driver's seat 13, and operate the traveling lever and pedal device to make the lower traveling body 2 travel. Also, by operating the working lever device 14, the working device 4 can be rotated to perform earthwork excavation operations and the like. Further, when the hydraulic excavator 1 is reversed or when the upper swing body 3 is swung, the operator can visually observe the video of the rear or the like projected on the screen 21A of the monitor device 21 provided in the cab 11, and perform the work while observing the range that is difficult to see from inside the cab 11.

[0037] Next, for example, when excavating a deep hole with the working device 4, the tip side of the working device 4 cannot be seen while sitting on the driver's seat 13. Therefore, the operator opens the front window 18, raises the waist from the driver's seat 13, extends the upper body forward, and peeks down to operate the working device 4. Also, when the operator performs the work while communicating with the surrounding workers, the operator also opens the front window 18 to perform the work.

[0038] Therefore, an example of the procedure for moving the front window 18 of the cab 11 to the window-open position and the window-closed position will be described.

[0039] When opening the front window 18 and storing it on the top surface 15E side of the cab box 15, the operator releases the lock of the front window 18, grabs any one of the handles 18F to 18H, and moves the front window 18 upward. As a result, the front window 18 is arranged at the window-open position with each roller 18E moving along the guide rail 17. On the other hand, when closing the front window 18, the front window 18 can be arranged at the window-closed position by performing the work in the reverse procedure of the above-described window-opening operation.

[0040] Thus, according to the present embodiment, the monitor device 21 provided in the cab box 15 and displaying various information is attached to the front window 18. As a result, the monitor device 21 moves between a closed window position where it is housed in the window frame 16 of the cab box 15 and closes the opening 16A as the front window 18 moves, and an open window position where it is stored under the top surface portion 15E of the cab box 15.

[0041] Therefore, in the present embodiment, when the front window 18 is moved between the closed window position and the open window position, the monitor device 21 does not contact the front window 18. Accordingly, in the present embodiment, damage to the monitor device 21 due to contact with the front window 18 can be prevented. Further, since it is not necessary to adjust the attachment angle of the monitor device 21 in order to open and close the front window 18 as in Patent Document 1, the front window 18 can be easily opened and closed.

[0042] Moreover, when the front window 18 is open, the monitor device 21 can be arranged together with the front window 18 below the top surface portion 15E of the cab box 15. As a result, it is difficult for rainwater, dust, sediment, etc. that have entered the cab 11 from the opening 16A of the window frame 16 to adhere to the monitor device 21, and malfunctions and dirt of the monitor device 21 can be prevented. As a result, the durability of the monitor device 21 and the visibility of the screen 21A can be improved.

[0043] The monitor device 21 is attached to the front window 18 using a universal joint 20 whose attachment angle is adjustable. Therefore, the monitor device 21 can direct the screen 21A toward the operator sitting in the driver's seat 13 by means of the universal joint 20 whether the front window 18 is in the closed window position or the open window position. Thereby, the visibility of the screen 21A of the monitor device 21 can be enhanced. Moreover, even when the front window 18 is stored under the top surface portion 15E, the video (information) of the screen 21A of the monitor device 21 can be provided to the operator.

[0044] Inside the cab box 15, there is a driver's seat 13 for the operator to sit on. Above this, the monitor device 21 is attached to the front window 18 so as to be positioned in front of the backrest 13B of the driver's seat 13 in a state where the front window 18 is arranged at the open window position shown in FIG. 3. Thereby, the monitor device 21 can be arranged at a position that is easily visible to the operator sitting on the driver's seat 13 even in a state where it is arranged at the open window position together with the front window 18.

[0045] Furthermore, the cab box 15 is provided with an entrance / exit 15H for getting in and out on the left side surface 15C which is one of the left-right directions. And the monitor device 21 is arranged on the right side (the other of the left-right directions) of the front window 18 which is on the opposite side of the entrance / exit 15H. Thereby, the monitor device 21 can be arranged at a position where it does not get in the way when getting in and out through the entrance / exit 15H.

[0046] In the embodiment, the cab 11 of the crawler type hydraulic excavator 1 as a cab for construction machinery has been described as an example. 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 equipped with a wheel type lower traveling body. Furthermore, it can be widely applied to cabs of other construction machinery such as hydraulic cranes.

Explanation of Reference Numerals

[0047] 1 Hydraulic Excavator (Construction Machinery) 11 Cab (Cab for Construction Machinery) 13 Driver's Seat 13B Backrest 15 Cab Box 15A Front Surface Part 15C Left Side Surface 15E Top Surface 15H Entrance / Exit 16 Window Frame 16A Opening 18 Front Window 20 Universal Joint 21 Monitor Device

Claims

1. A cab box having an opening formed on the front side, a front window provided in the cab box and movable between a closed window position for closing the opening and an open window position stored under the top surface portion of the cab box, a monitor device provided in the cab box for displaying various information, In a cab for construction machinery comprising: The monitor device is attached to the front window and moves between the closed window position and the open window position as the front window moves. A cab for construction machinery characterized by this.

2. In the cab for construction machinery according to Claim 1, The monitor device is attached to the front window using a flexible joint whose mounting angle is adjustable. A cab for construction machinery characterized by this.

3. In the cab for construction machinery according to Claim 1, A driver's seat for the operator to sit on is provided in the cab box, The monitor device is attached to the front window so as to be positioned in front of the backrest of the driver's seat in a state where the front window is disposed at the open window position. A cab for construction machinery characterized by this.

4. In the cab for construction machinery according to Claim 1, The cab box is provided with an access door for entering and exiting in one direction in the left - right direction, The monitor device is disposed on the other side in the left - right direction of the front window on the side opposite to the access door. A cab for construction machinery characterized by this.

Images