JPH10168941A - Working machine with driver's cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ventilate the inside of a driver's cab even in a small-sized working machine, etc., in which an air conditioner, etc., are omitted, by installing an open-close window to the side face section of the driver's cab. SOLUTION: The driver's cab 4, an engine room 5 and a counterweight 6 are mounted on a revolving frame 3 for a slewing super structure 2 while being placed in a turning radius R. A working device 10 with a lower boom 12, etc., is set up to the slewing frame 3 in a derrickable manner. On the other hand, a fixed type glass window 8 is fitted to the driver's cab 4 while being placed at a side face section 4D on the working device 10 side, and an open- close window 17 is installed to the glass window 8. A door section 21 is mounted pivotally on the rear section side of the glass window 8 through hinges, and opened and closed through a link mechanism from the inside of the driver's cab 4 while being pivoted to the outside rear of the driver's cab at a place displaced from the derricking range of the working device 10 in door opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine with an operator's cab suitably used for construction machines such as a hydraulic shovel, and more particularly, to a working machine with an operator's cab which is small in size as a whole and enables small turning. About.

[0002]

2. Description of the Related Art Generally, a driver's cab provided on a frame of a working machine body and having a front part, a rear part, and left and right side parts and formed in a box shape, and a front part of a frame of the working machine body. A working machine with a cab is widely known as, for example, a hydraulic shovel or the like, which includes a working device provided on the side and capable of elevating along one of the side surfaces of the cab.

In this type of conventional hydraulic excavator, an upper revolving structure as a work machine main body is rotatably mounted on a lower traveling structure, and a driver's cab, a machine room, and a A counter weight or the like is provided. Also, a boom,
A working device including an arm, a bucket, and the like is attached, and the working device is configured to move up and down along, for example, a right side surface of a cab.

Further, Japanese Utility Model Laid-Open No. 5-22651, Japanese Utility Model Laid-Open No. 7-4555, Japanese Utility Model Laid-Open No. 7-10061, and the like disclose that if the work site is as large as the width of a vehicle, the upper revolving unit is swung. There has been disclosed a hydraulic excavator called a small swivel type capable of performing excavation work and the like.

[0005] In this small turning hydraulic excavator, the upper revolving superstructure is formed into a substantially circular shape with an outer diameter corresponding to the vehicle width so that the entire upper revolving structure is within a small turning radius. The counter weight and the like are arranged compactly within this turning radius.

In a work site with a narrow vehicle width, the upper revolving unit is turned while the boom, arm, and the like of the working device are turned (elevated) so as to be folded small so as not to protrude from within the turning radius. The excavated earth and sand is discharged to a desired position.

[0007]

By the way, the above-mentioned prior art small-swing hydraulic excavator is configured to be compact so that the cab, machine room, counterweight and the like can be accommodated within a turning radius of about the vehicle width. Therefore, the layout of the driver's cab or the machine room is often greatly restricted, and it is difficult to arrange an air conditioner such as an air conditioner in the driver's cab or to house the compressor or the like in the machine room, For example, the actual situation is that ventilation and ventilation in the driver's cab are performed while the door for getting on and off is kept open.

However, in this case, it is not always possible to improve the air permeability in the cab, and there is a problem that the temperature in the cab becomes high in summer and the like, and the livability decreases.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention has a structure in which the cab is formed to be compact as a whole, and even if an air conditioner such as an air conditioner is omitted, ventilation and ventilation in the cab can be achieved. It is an object of the present invention to provide a working machine with an operator's cab, which can smoothly perform the operation, improve the livability of the operator's cab, and maintain a good view from the operator's cab.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a work machine body having a box-like shape having a front surface, a rear surface, and left and right side portions. Operation with a driver's cab, which is provided on the front side of the frame of the working machine main body and which can be raised and lowered along one of the side surfaces of the driver's cab. Applied to the machine.

A feature of the structure adopted by the invention of claim 1 is that the driver's cab is provided with an opening / closing window for ventilation on the one side portion, and the opening / closing window extends from inside to outside of the driver's cab. It is configured to be disposed at a position outside the range of raising and lowering of the working device even when the door is opened.

According to the above construction, one of the left and right side portions of the cab is provided with an opening / closing window for ventilation, and the other side portion is provided with a door for getting on and off. Therefore, for example, by opening the open / close window for ventilation from the cab to the outside with the door open, ventilation in the cab can be easily performed through the door and the open / close window. Also, since the opening / closing window is disposed at a position outside the range of raising and lowering of the working device even when the door is opened, it is possible to prevent the working device from coming into contact with the opening window opened toward the outside of the cab. In addition, when the opening / closing window is opened or closed, the view from the cab is not obstructed.

Further, in the invention according to claim 2, the opening / closing window is located on the rear side of the one side surface portion and is formed in a convexly curved see-through plate portion, and the rear portion of the window portion A door portion rotatably provided on the side and rotated backward when the door is opened, the door portion curves with a curvature corresponding to the see-through plate portion, and a part of the see-through plate portion when the door is closed. It is formed of a transparent plate material so as to constitute.

Thus, even when the door is opened or closed, a good view from the driver's cab can be maintained through the door and the see-through plate. In addition, since the door portion has substantially the same curved surface as the transparent plate portion when the door is opened, high strength (rigidity) can be given to the transparent plate portion and the door portion, and the external shape of the cab is improved. Can be. When the door is opened from this state, the window of the see-through plate can be opened by rotating the door toward the outside rearward.

Further, in the invention according to claim 3, the opening / closing window has a link mechanism foldably mounted between a guard member provided in the cab and the door portion, and a foldable portion of the link mechanism. And a knob for opening and closing operation provided, wherein the link mechanism is configured to selectively lock the door at a closed position and an open position.

By this, when the opening / closing window is opened, the link mechanism is extended so as to open from the folded state by manually operating the opening / closing knob, and the door is smoothly moved from the closed position to the open position. The door can be locked in the open state by the link mechanism in the open position. Also, when closing the opening / closing window, by operating the knob portion in the opposite direction to that when the door is opened so as to fold the link mechanism, the door portion can be smoothly rotated from the open position to the closed position,
In this state, the door can be locked at the closed position by the link mechanism.

According to a fourth aspect of the present invention, the work implement main body comprises an upper revolving structure rotatably mounted on a lower traveling structure, wherein the upper revolving structure is located within a turning radius close to the vehicle width. In addition, a machine room and a counterweight are provided together with the cab.

Thus, the turning radius of the upper turning body can be made substantially equal to the vehicle width, and the working device is turned (elevated) to a position within the turning radius, for example, to be narrower. If the work site is as wide as the vehicle width, the upper swing body can be swung to perform excavation work or the like.

[0019]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 to 6 show an embodiment of the present invention. In this embodiment, a small turning hydraulic excavator will be described as an example of a working machine with a cab.

In the figure, 1 is a lower traveling body, 2 is a turning center O-
O shows an upper revolving structure that constitutes a working machine main body mounted on the lower traveling structure 1 so as to be rotatable around O;
On the revolving frame 3, a driver's cab 4 located on the left side of the upper revolving unit 2 and an engine, a hydraulic pump (neither is shown) and the like are located on the rear or right side of the driver's cab 4. And a counter weight 6 and the like located at the rear side of the machine room 5.

Here, as shown in FIG. 3, the turning radius of the upper revolving unit 2 is substantially equal to the vehicle width of the hydraulic excavator (the interval between the crawler belts 1A of the lower traveling unit 1) about the turning center OO. The cab 4, the machine room 5, and the counterweight 6 of the upper swing body 2 are formed in a circle C having a turning radius R, which is formed in a substantially circular shape along the circle C of R. On the other hand, in the center of the front side of the turning frame 3, a working device 10, which will be described later, is mounted diagonally forward and diagonally right of the cab 4.

As shown in FIG. 3, the cab 4 is formed in a substantially box shape having a front surface 4A, a rear surface 4B, left and right side surfaces 4C and 4D, and a ceiling 4E. A door (not shown) for moving up and down into the cab 4 is provided on the side surface 4C.
Are mounted so that they can be opened and closed. Further, the driver's cab 4 has a left side 4C formed in a substantially arc shape along a circle C having a turning radius R, and a rear side 4B from the rear side of the right side 4D.
Is formed in a convex curved shape so as to improve its external shape.

As shown in FIG. 1, a front side column 4F, a center column 4G, and a rear side column 4H are formed on the right side 4D in the vertical direction. A fixed-type glass window 7 is provided on the side surface 4D of the cab 4 between the pillars 4F and 4G, and a transparent plate is located between the pillars 4G and 4H. Another glass window 8 is provided, and a glass window 9 is provided on the rear surface portion 4B of the cab 4 as shown in FIG.

Here, these fixed glass windows 7,
Reference numerals 8 and 9 are made of a transparent material such as tempered glass or acrylic resin, and the glass window 8 constitutes a rear portion of the side surface portion 4D and is formed as a convex curved see-through plate portion having a constant curvature. ing. An opening / closing window 17 to be described later is provided at a lower rear side of the glass window 8.

A working device 10 is attached to the upper revolving unit 2 so as to be able to move up and down. As shown in FIGS. 1 and 3, the working device 10 has a pivot pin 11 at the front center of the revolving frame 3.
A, which is rotatably mounted in the left and right direction via A, and which is rotated by a horizontal rotation cylinder 11B.
1, a lower boom 12 that is attached to the rotating bracket 11 so as to be able to move up and down and is moved up and down by a boom cylinder 12A, and an upper boom 13 that is connected to the distal end side of the lower boom 12 and is rotatable in the vertical direction. An arm 14 pivotally connected to an arm cylinder 14A and pivotably mounted on the distal end side of the arm 14; And a bucket 15 which is rotated by 15A.

The upper boom 13 is connected at its base end to the rotating bracket 11 via a long cross rod 16, and the upper boom 13 is rotated by the cross rod 16 in the vertical direction following the upward and downward movement of the lower boom 12. (Elevation). Further, the working device 10
Are rotated left and right from the front of the upper revolving unit 2 by rotating the rotating bracket 11 with the horizontal rotating cylinder 11B, and the cylinders 12A, 14A, 15
By actuating A, the upper swing body 2 is vertically rotated (elevated) at these positions.

Here, when the working device 10 is moved up most, the lower boom 12 is rotated to the maximum raising position indicated by a two-dot chain line in FIG. 3, and the lower boom 12 is moved forward of the maximum raising position. The side can be raised and lowered along the side surface portion 4D of the cab 4. In this state, as shown in FIG. 1, since the upper boom 13 is greatly extended upward at the distal end side of the lower boom 12 by the cross rod 16, by rotating the arm 14 and the bucket 15 so as to be folded small, The entire working device 10 can be accommodated within the turning radius R of the upper rotating body 2, and even if the work area is as narrow as the vehicle width even in a narrow work site, the upper rotating body 2 can be turned to perform excavation work such as earth and sand. It has a configuration that can be used.

Reference numeral 17 denotes a ventilation opening / closing window provided in the glass window 8 of the cab 4 so as to be opened and closed. As shown in FIGS. 4 to 6, the opening / closing window 17 includes a window 18 and a door, which will be described later. 21 and a link mechanism 23 and a knob 34 to be described later for opening and closing the door 21.

Reference numeral 18 denotes a window formed as an opening having a substantially square shape and located below the rear portion of the glass window 8. The portion of the glass window 8 left behind the window 18 is shown in FIG. 5 and a mounting portion 8A for mounting the door portion 21 as shown in FIG.
It has become.

Reference numeral 19 denotes a rim provided around the window 18. As shown in FIGS. 4 and 5, the rim 19 is formed of an elastic material such as rubber or resin into a substantially U-shaped cross section. The window 18 is fitted over the entire periphery of the glass window 8 serving as a peripheral portion of the window 18. Further, a seal 20 made of a thin plate of rubber or the like is fixed to the rim 19 at a position outside the cab 4 over the entire periphery of the window 18.

When the opening / closing window 17 is closed, the edging portion 19 and the sealing body 20 are elastically sandwiched between the door portion 21 and the glass window 8 so that the edge portion 19 and the sealing body 20 are protected from external rainwater and the like. To prevent generation of abnormal noise between them due to vibrations from the engine, etc., and to improve the external shape of the opening / closing window 17 by edging the outer peripheral side thereof.

Reference numeral 21 denotes a door portion for opening and closing the window portion 18. Like the glass window 8, the door portion 21 is made of a transparent material such as tempered glass or acrylic resin, and has a curvature corresponding to the glass window 8. It is formed in a substantially quadrangular shape as a curved plate having. As shown in FIGS. 4 and 5, the rear side of the door portion 21 is attached to the attachment portion 8A of the glass window 8 via a pair of hinges 22, 22 which are separated from each other upward and downward. The door 21 is rotatably supported with respect to the mounting portion 8A of the window 8.

Here, when the opening / closing window 17 is closed, as shown in FIG. 5, the door 21 is locked in the closed position by the link mechanism 23. In this state, the door 21 forms a part of the glass window 8. And the outer edge side thereof is elastically in contact with the seal body 20 over the entire circumference. When the opening / closing window 17 is opened, the door portion 21 faces the outside rear of the cab 4 and is indicated by an arrow A in FIGS.
The door 21 is locked in the door opening position by the link mechanism 23 as shown in FIG.
Are kept open.

In this case, as shown in FIG. 3, the door 21 is opened and closed in an arc-shaped trajectory L. Even when the lower boom 12 is largely moved up and down, the door 21 is separated from the lower boom 12 to the rear. Also, when the door is opened, the working device 10 is out of the range of raising and lowering. Further, since the opening / closing window 17 is provided on the right side surface portion 4D located near the center O of the turning radius R, the turning radius R can be set even when the door is opened.
It is rotated at a position where it does not protrude.

Reference numeral 23 denotes a link mechanism provided for opening and closing the opening / closing window 17, and the link mechanism 23 includes a guard member 24 provided in the cab 4 and the opening / closing window 17 as shown in FIG. The door 21 is horizontally foldable.

Here, the guard member 24 is formed of a long metal piece, is located in the driver's cab 4, is erected horizontally between the pillars 4 G, 4 H, and extends along the lower side of the glass window 8. Extending to bend. As shown in FIG. 6, a mounting projection 24A for the link mechanism 23 is provided on the guard member 24.
Are formed so as to project toward the glass window 8 side.

The link mechanism 23 is connected to the guard member 2.
4 and a first link portion 28 rotatably connected to the guard-side mounting portion 26 via a rotation shaft 27.
A second link unit 30 rotatably connected to the first link unit 28 via a rotation shaft 29; and a second link unit 30.
And a door-side mounting portion 33 and the like, which are rotatably connected to the front portion of the door portion 21 via a rotary shaft 31 and fastened via bolts 32 to a portion near the front side of the door portion 21.

The second link portion 30 is formed to have a substantially L-shaped cross section over the entire length, and has a downwardly bent portion 30A. Further, the second link unit 30
Is formed with a rounded concave portion 30B on the side of the rotating shaft 31, and the concave portion 30B is adapted to be engaged with the convex portion 26A of the guard side mounting portion 26.

When the opening / closing window 17 is closed, as shown in FIG. 5, the first link portion 28 and the second link portion 30 of the link mechanism 23 are folded so as to overlap each other. The recess 30A of the second link 30
Locks the opening / closing window 17 at the door closing position by engaging with the convex portion 26A of the guard side mounting portion 26. As a result,
Even if the door portion 21 is intentionally pryed open from the outside of the cab 4 in the direction of arrow A in FIG. 5, the concave portion 30B is held in a state engaged with the convex portion 26A of the guard side mounting portion 26,
The door 21 can be prevented from being opened from outside the cab 4.

Numeral 34 denotes a knob for opening / closing operation attached to the link mechanism 23. As shown in FIG. 4, the knob 34 protrudes downward from the position of the rotation shaft 29 which is a folded part of the link mechanism 23. The operator's seat 35 provided in the operator's cab 4 is disposed at a position where the operator can manually operate the driver's seat 35.

Then, when the opening / closing window 17 is opened, the knob 34 is manually rotated in the direction of arrow B in FIG. 4 to bring the link mechanism 23 from the folded state as shown in FIG. By turning in the direction of arrow B to be in the extended state as shown in FIG.
Numeral 1 is configured to be turned in the direction of arrow A toward the outside rear of the cab 4.

Reference numeral 36 denotes a second link portion 30 and a door-side mounting portion 33.
The urging spring 36 is provided between the
The link portion 30 is constantly urged against the door-side mounting portion 33 in the direction indicated by the arrow F in FIGS. 5 and 6, whereby the door portion 21 is moved to one of the closed position and the open position. Selectively locked into position.

That is, when the opening / closing window 17 is closed as shown in FIG.
Is urged in the direction of arrow F around this link, and this urging force is applied to the link portions 28 and 30 around the rotation shaft 29 in the direction of arrow B.
By acting in the opposite direction, the link mechanism 23 is held in a folded state.

When the opening / closing window 17 is open as shown in FIG. 6, the bent portion 30A of the second link portion 30 urged in the direction indicated by the arrow F by the urging spring 36 is connected to the tip of the first link portion 28. As a result, the link portions 28 and 30 are held in an extended state by the biasing spring 36 with the bent portion 30A serving as a stopper.

Reference numeral 37 denotes the glass windows 8, 9 and the pillar portion 4.
The adhesive sealant 37 is provided between the glass windows 8, 9 and the column 4H as shown in FIGS. 5 and 6.

The small turning hydraulic excavator according to the present embodiment has the above-described configuration, and its operation will be described below.

First, during operation of the hydraulic excavator, the cylinders 12A, 14A and 15A are operated to
The lower boom 12, the upper boom 13, the arm 14, the bucket 15, and the like of the working device 10 are rotated (elevated) to excavate earth and sand. The horizontal rotation cylinder 11
By actuating B, the entire working device 10 is swung in the left-right direction via the rotating bracket 11, whereby the bucket 15 is moved to either the left or right of the upper revolving unit 2 to perform a trench work or the like. The upper revolving unit 2 can be appropriately rotated on the lower traveling unit 1 as needed.

On the other hand, when ventilating or ventilating the cab 4, the knob 34 shown in FIG. 4 is manually turned in the direction of arrow B to cause the first link 28 of the link mechanism 23 to rotate. Is rotated in the direction of arrow B around the rotation shaft 27 as shown in FIGS. And at this time the second
The link portion 30 rotates relatively to the first link portion 28 around the rotation shaft 29, whereby the link mechanism 23 is extended to open from the folded state.

As a result, the door 21 of the opening / closing window 17 is
As shown in FIG. 6, the door is rotated in the direction of arrow A toward the outside rear of the cab 4 from the locked state at the door closing position, and locked at the door opening position shown in FIG. As a result, since the window 18 of the opening / closing window 17 is held in the open state, for example, by opening the door of the side surface 4C of the cab 4, the door 18 between the entrance / exit of the cab 4 and the window 18 is opened. Ventilation or ventilation can be performed.

When the opening and closing window 17 is closed, the link mechanism 23 is folded around the pivot shaft 29 as shown in FIG. Therefore, the door 21 is rotated to the door closing position by the link mechanism 23 and is locked at this position.

Thus, in this embodiment, the ventilation window 17 is provided on the glass window 8 provided on the right side 4D of the cab 4, and the door 21 of the window 17 is closed when the door is closed. Formed of a transparent material so as to be a part of the window 8,
When the door is opened, it is configured to rotate toward the outside of the driver's cab 4 at a position outside the range of raising and lowering of the working device 10. By doing so, the doorway of the cab 4 and the opening / closing window 1
Ventilation and ventilation in the driver's cab 4 can be performed smoothly with the window 18.

In this case, since the door portion 21 of the opening / closing window 17 can be opened at a position outside the range in which the working device 10 can be raised and lowered,
Even during work such as excavation, the working device 1 is attached to the opened door portion 21.
0 can reliably prevent the lower boom 12 etc. from coming into contact,
The ventilation and the like in the cab 4 can be performed safely. Also,
Even when the door 21 is opened, the upper swing body 2 can be safely swung. In addition, when the opening / closing window 17 is closed, a part of the glass window 8 can be configured by the door 21, and when the door is closed, the driver's cab is also operated. 4 can be kept in a good view.

Therefore, according to the present embodiment, even if the cab 4 is formed compact as a whole and an air conditioner such as an air conditioner is omitted, the ventilation and the like in the cab 4 can be smoothly performed by the opening / closing window 17 and the like. This can greatly improve the livability of the cab 4 without impairing the operability and safety of the excavator.

Further, since the shape of the door portion 21 is curved corresponding to the glass window 8 of the cab 4, even when the door portion 21 is formed of a resin material or the like, the door portion 21 has high strength (rigidity). For example, the opening / closing window 17 can be easily provided even for a curved glass window 8 in which it is difficult to provide a sliding-type opening / closing window or the like. Further, the door portion 21 has substantially the same curved surface as the glass window 8 when the door is closed, so that the external shape of the operator cab 4 can be reliably improved, and the aesthetics of the hydraulic shovel can be enhanced.

On the other hand, between the door portion 21 of the opening / closing window 17 and the guard member 24 of the cab 4, there is provided a knob portion 34 for opening / closing operation.
When the opening / closing window 17 is opened and closed, the driver's seat 3 is installed.
By simply manually operating the knob 34 disposed in the vicinity of the door 5, the door 21 can be pivoted so as to open greatly to the outside of the cab 4 via the link mechanism 23 without touching the door 21. The door 21 can be selectively locked between the open position and the closed position by the link mechanism 23 (biasing spring 36).

As a result, the operability of the opening / closing window 17 can be greatly improved, and it is possible to surely prevent a driver or the like from applying extra force to the door portion 21 or feeling bending of the door portion 21. In addition to this, it is possible to prevent the door portion 21 from being stained by hand marks or the like. Further, the door 21 is intentionally placed in the cab 4
When the door is closed, the concave portion 30B of the second link portion 30
A is maintained in a state of being engaged with the opening / closing window 17.
Has a structure that prevents the door from being opened from the outside of the driver's cab 4, the reliability of the opening / closing window 17 can be reliably improved.

The glass window 8 is provided with an edge portion 19 and a seal member 20 located on the outer edge side of the window portion 18.
When the opening / closing window 17 is closed, the door 21 is elastically brought into contact with the glass window 8 via the rim 19 and the sealing body 20. The gaps can be reliably sealed, vibration noise from the engine or the like can be prevented from being generated between them, and the appearance of the opening / closing window 17 can be kept beautiful.

Further, since the door 21 is rotated outward and rearward, the lower boom 12
Even when the driver or the like greatly raises, it is possible to take a sufficient distance between the opened door portion 21 and the working device 10, and even if the driver or the like pulls out the arm or the like from the window portion 18 in this state. ,
Inadvertent contact with the lower boom 12 or the like of the working device 10 can be prevented.

In the above embodiment, the opening and closing window 17 is provided on the glass window 8 having a convex curved shape. However, the present invention is not limited to this, and the opening and closing window 1 is provided on the glass window 8 formed in a planar shape.
7 may be provided. In this case, the opening / closing window 1 is provided.
The door 21 may be rotatably attached to a corner at the rear right side of the cab 4 via a hinge or the like.

Although the working machine with a cab has been described by taking a small turning hydraulic excavator as an example, the present invention is not limited to this. For example, an ordinary medium or large hydraulic excavator,
The present invention may be applied to construction machines such as hydraulic cranes and the like, as well as industrial and agricultural working machines with a cab.

[0062]

As described above in detail, according to the first aspect of the present invention, a ventilation opening / closing window is provided on one of the left and right side surfaces of the cab, and the opening / closing window is provided with the ventilation window. Since the door is opened to the outside of the operator's cab at a position outside the elevating range of the working device, for example, with the door for getting on and off provided on the other side of the operator's cab open, the opening / closing window is opened. By opening the door toward the outside of the driver's cab, ventilation and ventilation in the driver's cab can be performed smoothly, and visibility from the driver's cab can be prevented when the opening / closing window is opened or closed. Further, it is possible to reliably prevent the working device from coming into contact with the opening / closing window opened toward the outside of the cab, and it is possible to safely vent the inside of the cab even during the operation of raising and lowering the working device. Therefore, even if the operator's cab is formed as a whole compact and an air conditioner such as an air conditioner is omitted, ventilation and the like in the operator's cab can be smoothly performed by the opening / closing window or the like,
It is possible to greatly improve the livability of the cab without impairing the operability and safety of the working machine.

According to the second aspect of the present invention, the opening / closing window is formed with a convexly curved see-through plate portion and a window portion which is curved with a curvature corresponding to the see-through plate portion. Because it is configured by a transparent door portion that is rotated backward from the position of the window portion, when the door portion is closed, a good view from the driver's cab is maintained via the door portion and the transparent plate portion. Can be. In this case, since the door portion and the see-through plate portion constitute substantially the same curved surface, the external shape of the cab can be kept beautiful, the commercial value of the working machine or the aesthetic appearance can be improved, and, for example, the door portion can be improved. Can be provided with high strength (rigidity) even when is formed of a transparent resin material or the like. In addition, since the door portion is configured to be rotated rearward, for example, it is possible to easily dispose the opening / closing window even on a convex curved see-through plate portion where it is difficult to provide a sliding-type opening / closing window and the like, Even when the working device is largely raised and lowered, a sufficient distance can be provided between the opened door portion and the working device, and a highly safe opening / closing window can be provided in the working machine.

Further, according to the third aspect of the present invention,
The opening / closing window is foldably mounted between the guard member and the door in the cab, and a link mechanism for selectively locking the door between the closed position and the open position, and a knob for opening / closing operation. When the opening / closing window is opened / closed, the door can be pivoted so as to greatly open to the outside of the cab through the link mechanism by operating the knob in the cab, and the door can be opened and closed. The part can be reliably locked at the door opening position and the door closing position by the link mechanism. This allows
The operability of the opening / closing window can be greatly improved, and the problem that the door is soiled by touching the door during the opening / closing operation can be eliminated.

According to the fourth aspect of the present invention,
The work machine body consists of an upper revolving structure in which the cab, machine room, and counterweight are provided within a turning radius close to the vehicle width. A compact working machine capable of performing the above can be configured. In response to this, the cab is formed compact, and even if a ventilation device such as an air conditioner is omitted, the operability and safety of the working machine are not reduced by the opening and closing windows provided in the cab. Ventilation and ventilation can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a front view showing a small-swing hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a left side view of FIG. 1 showing the hydraulic excavator.

FIG. 3 is a plan view of FIG. 1 showing the hydraulic excavator in a state where a working device and the like are removed.

4 is an enlarged perspective view showing an opening / closing window and the like as viewed from the inside of the cab in FIG. 1;

FIG. 5 shows a state in which the opening / closing window is locked at the door closing position.
It is the expanded sectional view seen from the arrow VV direction in the middle.

FIG. 6 shows a state in which the opening / closing window is locked at the door opening position.
It is sectional drawing of the same position as (3).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure (working machine main body) 3 Revolving frame (frame) 4 Operator cab 4A Front part 4B Rear part 4C, 4D side part 5 Machine room 6 Counter weight 8 Glass window (transparent plate part) 10 Working device 17 Opening / closing window 18 Window part 21 Door part 23 Link mechanism 24 Guard member 34 Knob part R Turning radius

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobukatsu Asakura 650, Kandachicho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Ground 1 Hokuetsu Industrial Co., Ltd.

Claims (4)

[Claims] An operation cab provided on a frame of a work machine main body and having a front portion, a rear surface portion, and left and right side portions and formed in a box shape, and a front portion of the frame of the work machine main body. A working device provided with a working device that can be raised and lowered along one of the side surfaces of the cab. Opening / closing window is provided, and the opening / closing window is opened from the inside to the outside of the cab, and is arranged at a position outside the range of raising and lowering of the working device even when the door is opened. A working machine with a cab. 2. The window according to claim 1, wherein the opening / closing window is formed at a rear side of the one side surface and formed in a convexly curved see-through plate, and is rotatably provided at a rear side of the window. A door portion that is turned rearward when the door is opened, and the door portion is curved with a curvature corresponding to the see-through plate portion, and can be seen through to form a part of the see-through plate portion when the door is closed. The working machine with an operator's cab according to claim 1, which is formed of a plate material. 3. A link mechanism foldably mounted between a guard member provided in the driver's cab and the door, and an opening / closing operation provided at a foldable portion of the link mechanism. The working machine with a cab according to claim 2, further comprising a knob, wherein the link mechanism is configured to selectively lock the door at a closed position and an open position. 4. The work machine main body comprises an upper revolving structure rotatably mounted on a lower traveling structure, wherein the upper revolving structure is located within a turning radius close to the vehicle width and includes a machine together with the driver's cab. The working machine with a cab according to claim 1, wherein the working machine is provided with a room and a counterweight.