JPH10292432A - Driver's cab for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver's cab for a low-height construction machine capable of being carried to a construction work site of a tunnel or a subway and having an improved alighting boarding property. SOLUTION: A driver's cab for a construction machine is provided with a front side driver's cab 5A arranged with a front window glass and a rear side driver's cab 5B arranged on the rear side of the front side driver's cab 5A. One of the front side driver's cab 5A and rear side driver's cab 5B can be opened or closed in the longitudinal direction of a vehicle body in the halved driver's cab 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab of a construction machine such as a hydraulic shovel and the like, and more particularly, to a contact with an obstacle such as a foundation beam at a narrow work site such as a tunnel, a subway construction and an urban civil engineering construction. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab of a construction machine improved to prevent the occupant from getting on and off, and to improve driver's getting on and off.

[0002]

2. Description of the Related Art Construction machines such as hydraulic shovels are widely used for civil engineering work in cities, tunnels and subways, and the like. In recent years, excavators are used to prevent contact with obstacles such as electric poles, foundation beams, and workers working around hydraulic excavators at narrow work sites such as urban civil engineering work, tunnels and subway works. A turning frame is disposed within the width of a crawler belt (in the present invention, including a crawler belt, a track frame, and the like, and is referred to as a lower traveling body) so that even if the turning frame turns, it does not come into contact with obstacles or workers. Small swing hydraulic excavators have been developed. As shown in FIG. 19, the small turning hydraulic excavator 80 includes left and right lower traveling bodies 81a and 81b.
Revolving superstructure 8 via a revolving circle (not shown)
2 are provided. The upper swing body 82 is driven to swing by a swing motor (not shown). A driver's cab 83 is provided in the upper revolving superstructure 82. 83a is a driver's cab door. A boom 84, an arm 85, and a bucket 86 are sequentially connected to a bracket (not shown) provided on the right side of the cab 83.

As a prior art of a cab of a construction machine, the present applicant has filed Japanese Patent Application Laid-Open No. Hei 8-177081.
As shown in FIG. 20, the content of this application is to form an opening 94 which is continuous with the front part and the front part upper part by a left side wall 90, a right side wall 91, a rear wall 92, and a rear ceiling wall 93 facing each other in the width direction. Cab body 97 having a front wall 98a and a front ceiling wall 98
and a hook-shaped door 99 having substantially the same size as the opening 94 to which the b is integrally connected. The door 99 has a width along the upper rail 95 and the lower rail 95 provided in the cab body 97. A technique is described in which the opening 94 is closed at a position where the opening 94 is closed and the opening 94 is opened at a position where the opening 94 is opened by being slidable linearly in the direction.

By the way, the height of tunnels and subway works is limited, and construction machines such as hydraulic shovels need to have a vehicle height of 2 m or less. As a prior art in which the height of the cab is reduced, the present applicant has filed Japanese Patent Application Laid-Open No. Hei 8-41931. The content of this application is supported by a swing circle on a lower traveling body having crawler tracks or wheels operating at a work site with a vehicle height limitation, a driving source such as an engine, a cab for operator protection, tanks, controls, In a revolving low-height work vehicle having an upper revolving structure on which a working machine or the like is mounted, a revolving frame around a revolving center on the upper revolving structure opens a floor portion of the revolving frame and has a pit for an operator's leg. A configuration is described in which a footrest is provided on a lower floor part which is projected from a floor part below a pit and is concentric with a center of rotation and is surrounded by a cylindrical body having a bottom.

According to Japanese Patent Application Laid-Open No. Hei 8-2259, in a cabin of a traveling vehicle, a roof is provided on an upper part of a portal frame standing upright at the rear of the cabin, and a rail is provided on an upper part of the roof. A front glass frame integral with the front glass frame covering the front of the cabin is slidable through the rails so that the windshield can be stored on the roof, and a stand attached to the front glass frame during storage is mounted on the roof. Describes a technique that can be fixed.

[0006]

However, FIG.
The small-swing hydraulic excavator 80 shown in Fig. 1 has no problem in operation in urban areas, but the height to the ceiling of the driver's cab should be 2 m or less at work sites where the height of tunnels and subway construction is limited. There is a problem that can not be. Further, FIG.
When the side portion of the operator cab 83 of the small-swing hydraulic excavator 80 shown in FIG. 7 is shaped to match the arc shape of the upper swing body 82, a beam or the like of a foundation at a work site may protrude and become an obstacle.
For this reason, there is a problem that the door 83a of the cab 83 comes into contact with an obstacle when the door 83a is opened. Furthermore, the driver's cab 83
In a structure in which the door 83a is opened and closed on the side of the vehicle body, the driver cannot get on and off from the side of the vehicle body at a work site where the approach road for tunnel or subway construction is narrow. In addition, when escaping from the side of the vehicle body during emergency evacuation, the body may be in contact with obstacles such as foundation beams, which is dangerous.

In the cab shown in FIG. 20 of the above-mentioned JP-A-8-177081, the door 99 slides linearly in the width direction along the upper rail 95 and the lower rail 96 provided in the cab body 97. Since the opening 94 is opened when the driver gets on the vehicle, the door 99 protrudes from the left side wall 90 of the driver's cab body 97 to the outside of the vehicle body. For this reason, in a narrow work site where there are obstacles protruding from the foundation beams of tunnels and subway construction, etc., the doors 99
Have a problem of contact with obstacles.

On the other hand, in a narrow work site of a tunnel or a subway, there is an obstacle on the side of the vehicle, from which a foundation beam or the like protrudes. For this reason, in a conventional cab, if a door is arranged on the side of the vehicle body, it is dangerous because the door contacts an obstacle when the door is opened, or the obstacle comes into contact with the driver's body. The technique of improving the driver's cab of the present invention to avoid the danger of contact with obstacles and to make it easier for the driver to get on and off from the front or the rear of the cab is disclosed in Japanese Patent Application Laid-Open No. 8-41.
No. 931 and JP-A-8-2259 are not disclosed.

The present invention focuses on the above-mentioned conventional problems, and is a low-height construction machine that can be carried in even at narrow work sites such as urban civil works, tunnels and subway works. The driver's cab is divided into two so that the driver can get on and off the driver's cab from any of the directions. It is an object of the present invention to provide a cab of a construction machine which makes it easy for a person to get on and off from the front or the back of the cab.

[0010]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, a first embodiment of a cab of a construction machine according to the present invention is provided.
The invention is characterized in that at least in a driver's cab of a box-shaped construction machine having a windshield, a skylight, a window frame, a left side plate, a right side plate, a rear plate, and a ceiling fixed to the upper revolving superstructure. A front driver's cab 5A, 15A, 25A, 35A, 45 having a front window glass 5c and a front side of the right side plate 5f and the left side plate 5a.
A, 48A, 49A and front driver's cab 5A, 15
A, 25A, 35A, 45A, 48A, 49A, and are arranged rearward, and at least a rear plate 6h,
Rear cabs 5B, 15B, 25B, 35B, 45B, 48 having a right side plate 6f and a rear side of the left side plate 6a.
B, 49B, and the front driver's cab 5A, 15B.
A, 25A, 35A, 45A, 48A, 49A or rear cabs 5B, 15B, 25B, 35B, 45B,
Any one of 48B and 49B is divided into two cabs 5, 15, 25, 35, 45, and 4 that can be opened and closed in the front-rear direction of the vehicle body.
8, 49. According to the above configuration, the front-side cab or the rear-side cab of the two-part cab can be opened and closed in the front-rear direction of the vehicle body. You can get on and off from behind. Therefore, obstacles such as beams at the foundation of tunnels and subway construction,
Safe because there is no contact between the door and the driver. Also, compared to the driver's cab described in the above-mentioned Japanese Patent Application Laid-Open No. H8-2259, the front driver's cab and the rear driver's cab are divided into two parts, so that the rigidity is improved and the weight is reduced to two. Driver's cab.

According to a second aspect of the present invention, in the configuration of the first aspect, the front driver's cab is formed of at least a front window glass, a skylight, and a right side plate and a left side plate on the front side, and is formed in a box shape. It is what it was. According to the above configuration, the front driver's cab is formed in a box shape, so that rigidity is improved and durability is improved.

According to a third aspect of the invention, in the configuration of the first or second aspect, a contact surface between the front cab and the rear cab is formed on the same plane. According to the above configuration, the division surface of the front-side cab and the rear-side cab is on the same plane, the seal member can be easily mounted, and the cab has a good sealing property. Therefore, it is possible to reliably prevent rainwater from entering the cab.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the rear driver's cab is attached to a frame of the upper revolving unit via an elastic body. It is. According to the above configuration, the rear driver's cab is attached to the vehicle body frame via the elastic body. Therefore, it is not necessary to accurately manufacture the lower surface of the rear driver's cab and the mounting surface of the vehicle body frame. The production cost is low.

According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the front driver's cab comprises:
It has a configuration having windshields 8, 48a that open and close in the vertical direction and / or the horizontal direction.
According to the above configuration, when the front driver's cab is opened at a narrow work site where obstacles such as foundation beams such as tunnels and subway works are in contact with obstacles, open the front window and operate the vehicle. Can get on and off. Also, when the driver evacuates from the driver's cab in an emergency, the driver can escape by opening the front window.

According to a sixth aspect of the present invention, in the configuration according to any one of the first to fifth aspects, the front driver's cab 5 is provided.
A, 15A, 25A, 35A, 45A, 48A, 49
A, or a driver's cab open detecting means 70 for detecting that one of the front driver's cab and the windshield 8, 48a is open, and operation of a construction machine working machine attached to the upper revolving unit. Is disposed in a circuit that supplies a pilot pressure for operating an operation valve 75 that switches between
The electromagnetic valve 72 is configured to receive a signal in an open state from the driver's cab open detecting means 70 and shut off the pilot pressure to the operation valve 75. According to the above configuration, even if a part of the body accidentally touches the operation lever when the driver enters the front driver's cab or / and the front window when getting on or off the vehicle, the operation lever can be operated. The valve is in the neutral position and the hydraulic cylinder does not operate.
As the detecting means, for example, a limit switch or a known semiconductor switch may be used. Therefore, even if the operation lever is operated by mistake when getting on or off the operator's cab, the hydraulic cylinder does not operate and the operation is safe.

According to a seventh aspect of the present invention, there is provided a box-shaped construction machine fixed to an upper swing body and having at least a windshield, a skylight, a window frame, a left side panel, a right side panel, a rear panel, and a ceiling. In the cab, the flat plate 20
A rear plate 20E disposed on the upper surface of H and in the vehicle width direction near the center of turning, and a second side plate 20B connected to the front side of the rear plate 20E and having a lower height on the front side than the rear plate 20E. And the front side of the back plate 20E, the height of the front side is lower than the back plate 20E, and the second
Third side plate 20 disposed on side plate 20B at a predetermined interval.
D, a rear panel 20E, a second side panel 20B, and an operator cab 5 attached to the upper surface of the third side panel 20D. According to the above configuration, the driver's cab lowers the heights of the left and right side plates and the rear plate of the driver's cab by using the second side plate 20B, the third side plate 20D, and the back plate 20E whose front side heights are low. Can be made smaller. Therefore, by reducing the height of the cab,
The vehicle can be a low-height vehicle with a height limit of 2 m or less in tunnel and subway construction, and the driver's cab can be made small, so that the cost is low. If the operator's cab is arranged substantially at the center in the left-right direction of the flat plate and at the front side as shown in FIGS. In addition to preventing contact with obstacles such as foundation beams, the left and right sides can be easily checked from the driver's cab and work can be performed safely.

According to an eighth aspect of the present invention, in the configuration of the seventh aspect, a cylindrical tube 201 having a bottom plate 20J is fixed to a lower surface of a flat plate 20H on which a second side plate 20B and a third side plate 20D are fixed on the upper surface. The configuration is as follows. According to the above configuration, the floor of the cab can use the bottom plate 20J by fixing the cylindrical tube 201 having the bottom plate 20J to the lower surface of the flat plate 20H. Thus, the operator's legs can be lowered onto the bottom plate 20J in the cab, and the position of the driver's seat can be made lower than that of the conventional cab structure shown in FIG. As a result, the driver's cab can be lowered, which is useful for a construction machine having a low vehicle height.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a cab of a construction machine according to the present invention will be described below with reference to FIGS. FIG. 1 is a side view of a construction machine such as a hydraulic shovel. FIG. 2 is a Z view of FIG. The lower traveling bodies 2a and 2b (lower left traveling body 2a and lower right traveling body 2b) of the construction machine 1 such as a hydraulic shovel shown in FIGS. An upper revolving unit 4 that can be turned by a turning motor (not shown) is mounted on upper portions of the lower traveling units 2a and 2b via a swing circle 3. As shown in FIG. 2, the cab 5 is placed substantially at the center of the upper swing body 4. A boom 60 of a working machine is mounted on the right side of the cab 5 by a first side plate 20A and a second
It is attached to the side plate 20B. The boom 60 shown in FIG. The arm 62 connects the bucket 64. The boom 60, the arm 62, and the bucket 64 are driven by hydraulic cylinders 61, 63, 65, respectively. The upper revolving unit 4 shown in FIG. 2 includes a first machine cab 4a for storing an engine, a second cab 4b for storing hydraulic devices such as operation valves and batteries, a third machine cab 4c for storing a hydraulic oil tank, and A fourth cab 4d for housing the fuel tank is provided. As shown in FIG.
The height L1 from L to the ceiling of the cab 5 is set to 2 m or less so that it can be carried into tunnels and subway works. Naturally, civil engineering work on the ground is possible with this vehicle. The body width S of the upper revolving unit 4 shown in FIG. 2 is smaller than the outer end width W of the left and right lower traveling units 2a and 2b, so that the upper revolving unit 4 does not interfere with an obstacle even if it turns 360 degrees. It has become.

Next, with reference to FIG. 3, each member constituting the revolving frame of the upper revolving unit 4 will be described in detail. A disc-shaped flat plate 20H (hereinafter, referred to as a flat plate 20H) is disposed above the swing circle 3. On the upper surface of the flat plate 20H, a back plate 20E is fixed in the left-right direction near the center of rotation. On the front side of the back plate 20E,
The first side plate 20A and the second side plate 20B are fixed.
A third side plate 20D is fixed to the front side of the back plate 20E at a predetermined distance from the second side plate 20B. Further, the first vertical plate 20F and the second vertical plate 20F are provided on the rear side of the back plate 20E.
The vertical plate 20G is fixed. The first vertical plate 20F and the second vertical plate 20G are respectively integrally fixed with mounting seats 20N, 20N on which counter weights (not shown) are placed. The back plate 20E, the first side plate 20A, the second side plate 2
0B, third side plate 20D, first vertical plate 20F, second vertical plate 20
G and the mounting seats 20N, 20N are both fixed to the flat plate 20H.

The back plate 20E and the first side plate 20 shown in FIG.
A and the second side plate 20B are integrally fixed by a connection plate 20c. The back plate 20E and the first side plate 20
A, the second side plate 20B and the connection plate 20c form a box structure. In addition, the back plate 20E, the second side plate 20B, and the third side plate 20D mount the cab 5 shown in FIGS. 1 and 2 and also serve as a side plate and a rear plate of the cab 5 described later. . An attachment seat 20K is provided, which is integrally fixed to each of the back plate 20E, the second side plate 20B, and the third side plate 20D and mounts the operator cab 5.

Next, the cab 5 shown in FIG. 1 and FIG.
A second side plate 20B erected on the upper surface of the flat plate 20H shown in FIG.
It is placed on the upper part of the third side plate 20D and the back plate 20E, and is disposed on the front side of the flat plate 20H and at the approximate center of the left and right. Also, on the right side of the cab 5, the first side plate 20A and the second side plate 20 that are fixed to the flat plate 20H.
B attaches the boom 60 of the working machine shown in FIGS. In FIG. 3, reference numeral 201 denotes the second side plate 20B,
Below the side plate 20D and the back plate 20E, and the flat plate 2
It is a cylindrical tube fixed to the lower surface of 0H. This cylindrical tube 201 fixes the bottom plate 20J. This backboard 20
E, second side plate 20B, third side plate 20D, first vertical plate 20F
And a central portion where the second vertical plate 20G is fixed is high, and the second side plate 20B and the third side plate 20D are
The height of the front side of the vehicle body is lower than OE. The second side plate 20B and the third side plate 2 having a low height on the front side of the vehicle body.
0D also serves as the left and right side plates of the cab 5 shown in FIGS. The back plate 20E also serves as a rear plate of the cab 5.

FIG. 4 is a side view of the cab 5. Driver's cab 5
Is divided into a front driver's cab 5A and a rear driver's cab 5B. The front driver's cab 5A and the rear driver's cab 5B are attached by a hinge 7 so as to be freely opened and closed. The rear driver's cab 5B includes a back plate 20E shown in FIG.
It is placed on the side plate 20B, the third side plate 20D, and the mounting seat 20K. The driver's cab 5 uses the second side plate 20B, the third side plate 20D, and the back plate 20E whose heights on the front side of the vehicle body are low, so that the left and right side plates 6a, 6f of the rear driver's cab 5B of the driver's cab 5 Since the height of the rear face plate 6h shown in FIG. 5 can be reduced, the height can be reduced. This allows
By reducing the height of the driver's cab, a vehicle having a low vehicle height of 2 m or less in tunnel or subway construction can be obtained.

Next, the cab 5 shown in FIGS. 4 and 5 will be described. The front driver's cab 5A includes a left panel 5a, a right panel 5f, a front driver's cab frame 5d, and a ceiling frame 5.
h, left window glass 5b, right window glass 5e, front window glass 5c, and skylight 5g. The front window glass 5c is mounted on a front window 8 described later. The front window 8 is openable and closable. The rear driver's cab 5B of the driver's cab 5 includes a left side plate 6a,
The right side plate 6f, the rear plate 6h, the ceiling 6j, the floor 6d, and the first opening 6 provided on the floor to accommodate the driver's legs.
c, a second window 6g through which the driver enters and exits, a left window 6b, a right window 6e, and a rear window 6i. The driver's cab 5 thus configured is configured such that the front driver's cab 5A can be freely opened and closed in the vertical direction by a hinge 7 with respect to the rear driver's cab 5B so that the driver can get on and off from the front. Conversely, the rear driver's cab 5B may be opened and closed vertically with respect to the front driver's cab 5A by a hinge 7 so that the driver can get on and off from the rear.

Referring to FIG. 6 which is a sectional view taken along the line AA of FIG. 4 and FIG. The window glass 5b on the left side is mounted on the left side plate 5a with H-shaped rubber 5i, and is a so-called fitted-in window. Pillar 5j is provided on the left side plate 5a of the front driver's cab 5A.
Is fixed. A grip handle 5k is fixed to the pillar 5j. Reference numeral 6k denotes a pillar fixed to the left side plate 6a of the rear cab 5B of the cab 5. A seal member 6L is mounted between a pillar 5j fixed to the left side plate 5a of the front cab 5A and a pillar 6k fixed to the rear cab 5B. The sealing member 6L prevents rainwater from entering the cab 5. A seal member 6m is mounted between the pillar 6k and the left window glass 6b. The right side plate 5f and the right window glass 5e of the opposite front side operator's cab 5A, and the right side plate 6 of the rear side operator's cab 5B.
The structure for attaching the seal member to f and the window glass 6e on the right side is also the same as the structure shown in FIG.

Referring to FIG. 7 which is a Y-view diagram of FIG. 4 and FIG. The frame 5d of the front cab 5A of the cab 5 shown in FIG. 4 includes frames 8a, 8b, 8c and 8d as shown in FIG.
The front window 8 described later is mounted. The front window 8 is provided with a front window glass 5c. The front window 8 can be freely opened and closed in the vertical direction by hinges 9a and 9b with respect to the frame 5d of the front driver's cab. The wiper 10a and the wiper driving device 10b are attached to the windshield 5c. That is, the front cab 5A is connected to the rear cab 5B by the hinge 7
It can be opened and closed freely in the vertical direction. Front window 8
Is openable and closable vertically with respect to the front side cab 5A by hinges 9a and 9b. A skylight guard 11 shown in FIG. 8 is attached to an upper part of a skylight 5g of a front side cab portion 5A of the cab 5 shown in FIGS.

Next, FIGS. 9 and 10 will be described. As shown in FIG. 9, the front cab 5A is openable and closable by the gas spring 12 with respect to the rear cab 5B. By the action of the gas spring 12, the driver can freely open and close in the vertical direction with a light operating force while holding the handle 5m of the front side cab 5A. By opening and closing the front driver's cab 5A, the driver can get on and off from the front of the vehicle body. As shown in FIG. 10, the front cab 5A is completely closed with respect to the rear cab 5B of the cab. In this state, the front window 8 mounted on the front driver's cab 5A can be opened and closed with a handle 8e.

According to the above embodiment, the front cab 5A or the rear cab 5B of the two-part cab can be opened and closed in the longitudinal direction of the vehicle body. The driver can get on and off the vehicle from the front or the rear. This is safe because the door and the driver do not come into contact with obstacles such as a beam at the foundation of a tunnel or subway construction. Further, as compared with the cab described in Japanese Patent Application Laid-Open No. H8-2259,
Since the divided front and rear cabs are box-shaped, the rigidity is increased, and a light-weight two-part cab can be provided.

Further, since the front driver's cab 5A is formed in a box shape of the front window glass 5c and the left and right side plates 5a and 5f, the rigidity is improved and the durability is improved. Furthermore, a front cab 5A and a rear cab 5B of the cab are provided.
Are divided into the same plane, so that it is easy to mount the seal member, and it is possible to provide an operator cab having good sealability. As a result, it is possible to reliably prevent rainwater from entering the cab.

Further, since the front driver's cab 5A has a front window 8 which opens and closes in the vertical direction, the front driver's cab 5A can be used at a narrow work site where there are obstacles such as foundation beams for tunnels and subway works. When the room 5A is in the open state and the vehicle comes into contact with an obstacle, the front window 8 is opened and the driver can get on and off. Further, when the driver evacuates from the driver's cab in an emergency, the front window 8 can be opened and escaped, which is safe.

The cab 5 includes a back plate 20E and
Second side plate 20B having a height lower than the back plate 20E on the front side of the vehicle body
By using the third side plate 20D and the back plate 20E, the heights of the left and right side plates and the rear plate of the cab can be reduced, so that the size can be reduced. Therefore, by lowering the height of the driver's cab, it is possible to provide a vehicle with a low vehicle height of 2 m or less in tunnel or subway construction, and to reduce the size of the driver's cab, thereby reducing costs.
In addition, as shown in FIGS. 2 and 3, the driver's cab is disposed substantially at the center in the left-right direction of the flat plate and at the front side.
In narrow work sites such as tunnels and subway construction, the cab prevents contact with foundations and other obstacles,
You can easily check the left and right from the cab and work safely.

The second side plate 20B and the third side plate 2
The cylindrical tube 201 for fixing the bottom plate 20J is fixed to the lower surface of the flat plate 20H below the 0D, so that the floor of the cab 5 can use the bottom plate 20J. Thus, the operator's legs can be lowered onto the bottom plate 20J in the cab, and the position of the driver's seat can be made lower than that of the conventional cab structure shown in FIG. As a result, the driver's cab can be lowered, which is useful for a construction machine having a low vehicle height.

Next, another embodiment of the cab according to the present invention will be described with reference to FIGS. 1 to FIG. 10 are denoted by the same reference numerals, and only the different parts will be described. The cab 15 shown in FIG. 11 includes a front cab 15A and a rear cab 15B. This front cab 1
5A is openable and closable by a hinge 7 with respect to a rear side cab 15B. As shown in the figure, the front driver's cab 15A is operated downward to be in an open state, and is operated upward to be in a closed state. According to such an embodiment,
The driver can get on and off the vehicle from above. Accordingly, when there is an obstacle on the front side of the vehicle body, the front driver's cab 15A can be operated in a downward direction to be in an open state so that the user can safely get on and off from the vehicle body upper side. The cab 25 shown in FIG. 12 includes a front cab 25A and a rear cab 25B.
The front cab 25A can be freely opened and closed by a hinge 7 with respect to the rear cab 25B. As shown in the drawing, the front driver's cab 25A is arranged so as to protrude forward from the front end of the frame 30D, so that the driver can easily get on and off from the front side of the vehicle body. As shown in the figure, the front driver's cab 15A is operated upward to enter an open state, and is operated downward to enter a closed state. The cab 35 shown in FIG. 13 is disposed in a state where the front cab 35A protrudes forward from the front end of the frame 30D, similarly to the embodiment shown in FIG. The operator cab 35A is operated downward to be in an open state, and is operated upward to be in a closed state. Thus, when there is an obstacle on the front side of the vehicle body, the front driver's cab 3
5A can be operated in a downward direction to be in an open state to safely get on and off from the upper side of the vehicle body. The cab 45 shown in FIG. 14 is configured such that a front cab 45A and a rear cab 45B are substantially divided into two. The rear driver's cab 45B is
D. This frame 40D is
5 also serves as a left side plate, a right side plate, and a rear plate. As a result, the driver's cab 45 can be made smaller, which is useful for low-height construction machines as in the above-described embodiment. In addition, the driver's cab is substantially divided into two, and the driver can easily get on and off from the front of the vehicle body. The front cab 48A and the rear cab 48B of the cab 48 shown in FIG. 15 have substantially the same structure as the embodiment described with reference to FIGS.
The front window 48a mounted on the 8A can be opened and closed laterally by the hinge 7A. This allows
Since the front driver's cab 48A has a front window 48a that opens and closes in the left-right direction, the front driver's cab 48A is opened at a narrow work site where there are obstacles such as foundation beams such as tunnels and subway works. Then, when contacting an obstacle, the front window 48a is opened and the driver can get on and off. Further, when the driver evacuates from the driver's cab in an emergency, the driver can escape by opening the front window 48a. The cab 49 shown in FIG.
9A is mounted on the frame 30D of the upper swing body.
The rear driver's cab 49B is openable and closable by the hinge 7 with respect to the front driver's cab 49A. Even in a narrow work site where there is an obstacle ahead in tunnel or subway construction, the rear driver's cab 49B can be opened and the vehicle can be safely boarded from the rear side of the vehicle. The rear cab 49B shown in FIG. 16 is operated downward to be in an open state, but on the contrary, the hinge 7 is provided at the upper end of the cab and the rear cab 49B is opened. You may make it open state by operating upward. The other embodiments of the cab described with reference to FIGS. 11 to 16 are the same as those of FIG.
10 to FIG. 10, and the detailed description is omitted here.

FIG. 17 shows a method of mounting the cab of each of the above embodiments. An elastic body 51 such as rubber for vibration isolation is arranged between a frame 50 of the cab 5 and a lower frame 52 on the vehicle body side, and is attached by bolts 53. Thereby, the propagation of the vibration from the vehicle body to the driver's cab is suppressed. In addition, the driver's cab 5
Is mounted on the vehicle body-side frame 52, so that it is not necessary to manufacture the lower part of the cab 5 and the mounting surface of the vehicle body-side frame 52 with high accuracy, so that the manufacturing cost is low.

The hydraulic circuit shown in FIG. 18 is a front cab 5A, 15A, 25A, 35 of the cab of each of the above embodiments.
When the A, 45A, 48A and the front windows 8, 48a are in the open state, the working machine hydraulic cylinder is not operated. This will be described with reference to FIGS. The front driver's cab 5A, 15A, 25A, 35A, 4
The detecting means 70 for detecting the open state of 5A, 48A and the front windows 8, 48a is connected to a power supply 71. The detecting means 70 is connected to the solenoid valve 72. This detection means 7
In the drawing, reference numeral 0 denotes, for example, a limit switch or the like, in which an output voltage is supplied to the solenoid valve 72 when the output contact is closed, as one embodiment. Alternatively, a known semiconductor switch or the like may be used. The solenoid valve 72 has a structure that switches between two positions, a position and b position. Solenoid valve 72
Is connected to the pilot hydraulic pressure source 73. This solenoid valve 7
2 is connected to the pilot valves 74a and 74b. The pilot valves 74a and 74b operate in conjunction with the operation of the operation lever 74. The pilot valve 74a is connected to an operation section of the operation valve 75 via a pilot line 75b. The pilot valve 74b is connected to an operation section of the operation valve 75 via a pilot line 75a. A hydraulic pump 77 is driven by the engine 76. This hydraulic pump 77 is connected to the operation valve 75. The operating valve 75 is connected to the working machine hydraulic cylinders 61 and 6 through a pipe 77a.
3, 65 head chambers b. The operation valve 75
Are working machine hydraulic cylinders 61, 63,
65 are connected to the bottom chamber a. According to such a hydraulic circuit, the front side cabs 5A, 15A, 25
A, 35A, 45A, 48A and front windows 8, 48
When the detecting means 70 detects the open state of a, the solenoid valve 72 is energized, and the valve 72 switches to the position a. Therefore, the pilot pressure discharged from the pilot hydraulic source 73 is shut off. As a result, the front driver's cab 5
A, 15A, 25A, 35A, 45A, 48A, 49A
When the front windows 8 and 48a are open, the pilot pressure does not flow into the pilot valves 74a and 74b. Therefore, when the driver gets on and off, the front driver's cab 5A, 15A, 25A, 35A, 4
When the 5A, 48A and the front windows 8, 48a are opened, even if a part of the body accidentally touches the operation lever, the operation valve is in the neutral position and the hydraulic cylinder does not operate. . Thereby, even if the operation lever is operated by mistake when getting on or off the driver's cab, the hydraulic cylinder does not operate and safety is ensured.

The driver's cab of the present invention is useful for low-height construction machines working in narrow places such as tunnels and subway works.
Needless to say, the present invention can be applied to construction machines that work in narrow places such as utility poles, electric wires, and building fences in urban areas on the ground, crane vehicles other than construction machines, and industrial vehicles.

[Brief description of the drawings]

FIG. 1 is a side view of a construction machine according to the present invention.

FIG. 2 is a Z view of FIG. 1;

FIG. 3 is a perspective view of the revolving frame of the upper revolving unit as viewed from diagonally forward left.

FIG. 4 is a side view of the split cab.

FIG. 5 is a schematic explanatory view of the split cab.

FIG. 6 is a sectional view taken along line AA of FIG. 4;

FIG. 7 is a Y view of FIG. 4;

FIG. 8 is an X view of FIG. 4;

FIG. 9 is a diagram illustrating an open / closed state of a front portion of a cab.

FIG. 10 is a diagram illustrating an open / closed state of a front cab of the cab.

FIG. 11 is a view for explaining an example of another embodiment of the split cab.

FIG. 12 is a diagram illustrating two examples of another embodiment of the split cab.

FIG. 13 is a diagram illustrating three examples of another embodiment of the split cab.

FIG. 14 is a view for explaining four examples of another embodiment of the split cab.

FIG. 15 is a diagram illustrating five examples of another embodiment of the split cab.

FIG. 16 is a diagram illustrating six examples of another embodiment of the split cab.

FIG. 17 is a diagram in which an elastic body is mounted between the driver's cab and the frame, and a W view is a diagram viewed from the front of the driver's cab.

FIG. 18 is a pilot circuit diagram for shutting off pilot pressure to the operation valve when the front part of the cab and the front cab are open.

FIG. 19 is a conventional hydraulic excavator.

FIG. 20 is a conventional cab.

[Explanation of symbols]

4: Upper revolving structure, 5, 15, 25, 35, 45, 48,
49… operator cab, 5A, 15A, 25A, 35A, 45
A, 48A, 49A ... front cab, 5B, 15
B, 25B, 35B, 45B, 48B, 49B: rear cab, 5c: front window glass, 5a: left panel (front cab), 5f: right panel (front cab),
7, 7A: hinge, 8, 48a: front window, 20B:
2nd side plate, 20D ... 3rd side plate, 20E ... back plate, 20H ...
Flat plate, 20I ... Cylindrical plate, 20J ... Bottom plate, 51 ... Elastic body, 52 ... Frame, 61, 63, 65 ... Hydraulic silencer, 70 ... Detection means, 72 ... Electromagnetic valve, 73 ... Pilot hydraulic pressure source, 74 ... Operation Lever, 74a, 74b: pilot valve, 75: operating valve, 77: hydraulic pump.

Claims (8)

[Claims] 1. A windshield, a skylight, a window frame, a left side plate, a right side plate, which is fixed to an upper revolving superstructure.
In a driver's cab of a box-shaped construction machine having a rear panel and a ceiling, at least a windshield and a front driver's cab having a front side of a right side panel and a left side panel, and a front side driver's cab. A rear cab having at least a rear panel and a rear side of a right side panel and a left side panel, wherein one of the front side cab and the rear side cab is located in front of and behind the vehicle body. An operator's cab for a construction machine, comprising an operator's cab divided into two parts that can be opened and closed in directions. 2. The cab for a construction machine according to claim 1, wherein the front cab comprises at least a windshield, a skylight, and a right side plate and a left side plate on the front side, and is formed in a box shape. A cab of a construction machine, characterized by the following: 3. The operator cab of a construction machine according to claim 1, wherein a contact surface between the front operator cab and the rear operator cab is formed on the same plane. 4. The cab of a construction machine according to claim 1, wherein the rear cab is attached to a frame of the upper swing body via an elastic body. 5. The cab of a construction machine according to claim 1, wherein the front cab has a windshield that opens and closes vertically or / and horizontally. Cab of construction machinery to be. 6. A driver's cab open detecting means for detecting that one of the front driver's cab or the front driver's cab and the windshield is open, and a construction machine attached to the upper revolving unit. An electromagnetic valve that is disposed in a circuit that supplies a pilot pressure for operating an operation valve that switches the operation of the work machine, and that shuts off the pilot pressure to the operation valve in response to a signal in an open state from the cab open detection means; The cab of a construction machine according to any one of claims 1 to 5, wherein the cab comprises: 7. A windshield, a skylight, a window frame, a left side plate, a right side plate, which is fixed to the upper revolving super structure.
In the operator's cab of a box-shaped construction machine having a rear plate and a ceiling, on the upper surface of the flat plate of the upper revolving structure, and
A rear plate arranged in the vehicle width direction near the turning center, connected to a front side of the rear plate, a second side plate having a height lower than the front side of the rear plate, and connected to a front side of the rear plate. A third side plate, which is lower in height on the front side than the rear plate and is disposed at a predetermined distance from the second side plate,
An operator's cab for a construction machine, comprising an operator's cab attached to an upper surface of a side plate and a third side plate. 8. The operation of a construction machine according to claim 7, wherein a cylindrical tube having a bottom plate is fixed to the lower surface of the flat plate on which the second side plate and the third side plate are fixed on the upper surface. Room.