JP2002194773A - Cab for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance reliability by preventing damage to a windshield mounted in a front part of a cab box and the like. SOLUTION: A guard frame 29 and a guard bar 35 are mounted in the front part 22A of the cab box 22 so as to be located on the front side of the windshield 24, and the guard bar 35 is mounted constitutionally in such a manner as to be vertically movable with respect to the guard frame 29. Accordingly, the guard frame 29 and the guard bar 35 can protect the windshield 24 and a windshield wiper 26 against sag parts 14A of cables, hoses and the like 14. In addition, because the guard bar 35 can be arranged in an optimum position in accordance with the sag parts 14A, the windshield 24, etc., can be reliably protected by one guard bar 35, and an operator can be provided with a wide visual field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab for a construction machine provided in a construction machine such as a horizontal excavator or a pile driver.

[0002]

2. Description of the Related Art Generally, construction machines include hydraulic excavators and hydraulic cranes. Further, as other special construction machines, there are a side excavator, a pile driver and the like. Here, the horizontal excavator is used when constructing a building or the like.
In order to prevent the surrounding groundwater from flowing when the basement is constructed, a waterproof wall is formed around the site, forming a deep groove in the ground surrounding the site and pouring mortar continuously. Form a waterproof wall. On the other hand, a pile driving machine forms a deep hole in the ground to solidify the foundation of the ground, and drives a pile into the hole.

[0003] Among the horizontal excavators and the pile driving machines, the horizontal excavators are known, for example, from Japanese Patent Application Laid-Open No. 2000-144794.

[0004] Here, the horizontal excavator is composed of a lower traveling body,
An upper revolving structure is mounted on the upper side of the lower traveling structure so as to be revolvable, and a working device is mounted on a front side of the upper revolving structure. In addition, a cab on which an operator rides is provided at a front end of the upper revolving structure, and an engine, a hydraulic pump, a switchboard, and the like are mounted on a rear side of the cab. further,
The cab includes a cab box including a front part, a rear part, a left side part, a right side part, and a ceiling part, and a windshield provided on a front part of the cab box.

On the other hand, the working device is mounted on the front side of the revolving frame and extends in the left and right directions, and an elevating device mounted on the frame so as to be movable in the left and right directions.
It is generally constituted by a working tool attached to the lifting device. Further, the working tool includes an auger screw type cutter for continuously digging a groove in the ground, an electric motor for driving the auger screw type cutter, and a drive device including a speed reducer. Furthermore, the work implement is equipped with a mortar injection device for pouring mortar into a groove dug by an August screw type cutter.

A power supply cable for supplying power to the electric motor of the driving device, a supply hose for supplying mortar to the mortar injection device, and an August screw type cutter are attached and detached between the upper rotating body and the working device. A hydraulic hose or the like for supplying and discharging pressure oil to a hydraulic cylinder or the like to be used extends. The lengths of these cables and hoses are set in consideration of the fact that the working tool of the working device moves upward, downward, left, and right with respect to the upper rotating body.

[0007]

By the way, in the above-mentioned cross excavator according to the prior art, the working device is arranged on the front side of the upper revolving unit, that is, near the front side of the cab. The lengths of the cables and hoses are set based on the positions where the working tools are most raised at the left and right ends.

For this reason, when the working tool of the working device is placed at the lowered position, the cables and hoses are slackened. When the working tool moves left and right in this state, when the working tool moves in front of the cab, a slack portion of cables and hoses is provided on the front glass of the cab or the windshield. There is a problem in that the wipers provided in the above may be hit, and these may be damaged.

SUMMARY OF THE INVENTION 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 prevent damage to a windshield provided on a front portion of a cab box and improve reliability. To provide a cab for a construction machine.

[0010]

According to a first aspect of the present invention, there is provided a cab for a construction machine provided with a cab box including a front portion, a rear portion, a left side portion, a right side portion, and a ceiling portion, and a front portion of the cab box. With a windshield.

Then, in order to solve the above-mentioned problem,
A feature of the structure adopted by the invention of claim 1 is that a guard frame is provided on a front portion of the cab box, and the guard frame extends leftward and rightward at a front position of a windshield and is movable upward and downward. The guard bar is attached.

With such a construction, for example, in a construction machine in which a horizontal digging device and a pile driving device are provided in front of the cab, cables and hoses connected to these devices are connected to the cab during operation. To move forward. However, even in such a case, the guard frame and the guard bar can protect the windshield from cables and hoses. In addition, by moving the mounting position of the guard bar upward and downward, the guard bar can be arranged at a position where the cables and hoses are going to collide with the windshield.

According to the invention of claim 2, the guard frame has left and right vertical frames extending upward and downward along both sides of the windshield, and the guard bar has both ends on the left and right vertical frames. In such a way as to be movably mounted on the vehicle.

[0014] With this configuration, the left and right vertical frames of the guard frame prevent the cables and hoses from colliding with both sides of the windshield, ie, the left and right portions, and the guard bar is provided with a cable. -Prevent hoses from hitting the center of the windshield.

According to the third aspect of the present invention, the guard bar is attached to the guard frame using a male screw member screwed from the rear side.

With this configuration, the guard bar can be easily attached to the guard frame using the male screw member. In addition, since the male screw member is screwed from the rear side of the guard bar and is covered and arranged when viewed from the front side, it is possible to prevent cables and hoses from being caught by the male screw member.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine cab according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings.
In the present embodiment, “front, rear” and “left, right”
Is used to mean a direction or a position as viewed from an operator boarding the cab.

First, FIGS. 1 to 6 show a first embodiment of the present invention. In this embodiment, a cab for a side excavator will be described as an example of a cab for a construction machine.

Reference numeral 1 denotes a crawler type lower traveling body, and 2 denotes an upper revolving body which is rotatably mounted on the lower traveling body 1 via a revolving device (not shown). Is equipped with a horizontal digging work device 3.

The upper revolving unit 2 includes a revolving frame 4
And a cab 21 described later provided at a front end of the turning frame 4, a counterweight 5 provided at a rear end of the turning frame 4, and provided between the cab 21 and the counterweight 5. A building cover 6 and a switchboard 7 provided on the upper side of the building cover 6 for supplying electric power to an electric motor of a driving device 11 to be described later;
The building cover 6 accommodates an engine, a hydraulic pump, a control valve and the like (all not shown).

Here, the horizontal digging work device 3 is attached to a bracket 4A provided at the front end of the revolving frame 4 so as to be tiltable, and has a rectangular guide frame 8 extending leftward and rightward. The lifting device 9 is movably attached to the left and right directions, and the working tool 10 is moved upward and downward by the lifting device 9.

The work implement 10 is mounted on a lift 9A of the lift 9 and has a driving device 11 composed of an electric motor, a speed reducer, and the like, and a plurality of Augusts extending downward and mounted on the driving device 11. Cru type cutter 12, 12, ...
This is roughly configured. Further, the working tool 10 incorporates a mortar injection device (not shown) for injecting mortar into a deep groove 37 to be described later excavated by the August screw type cutter 12.

Further, the horizontal digging work device 3 is mounted over the guide frame 8 and the left rear portion and the right rear portion of the revolving frame 4, and can be tilted by the back stays 13, 13 having the tilt hydraulic cylinders 13A, 13A. It is supported by.

Reference numeral 14 denotes cables and hoses provided between the upper swing body 2 and the horizontal digging work device 3. The cable and hoses 14 are, for example, from the switchboard 7 to the drive unit 1.
1. A power cable for supplying power to the electric motor, a supply hose for supplying mortar to the mortar injection device, and a hydraulic pressure for supplying and discharging pressure oil to a hydraulic cylinder (not shown) used for attaching and detaching the August screw type cutter 12. It consists of a hose and the like. Here, the lengths of the cables and hoses 14 are set in consideration of the fact that the working tool 10 of the working device 3 moves upward and downward with respect to the upper rotating body. For this reason, as shown in FIG. 1, when the work tool 10 is located on the lower side, the cables and hoses 14 form a slack portion 14 </ b> A between the upper swing body 2 and the guide frame 8. ing.

Next, reference numeral 21 denotes a cab according to the present embodiment, which is located at the front end of the revolving frame 4 and is located closer to the right side. The cab 21 is, as shown in FIGS. Cab box 22, door 23, windshield 2
4, 25, a guard frame 29, a guard bar 35, and the like.

Reference numeral 22 denotes a cab box which forms an outer shell of the cab 21. The cab box 22 has a front portion 22A,
The rear surface 22B, the left side 22C, the right side 22D, the ceiling 22E and the like form a box shape. Also, mounting seats 22F, 22F,... Are provided at a plurality of places on the ceiling 22E so that a head guard (not shown) for protecting the cab 21 from falling rocks or the like can be mounted later. ing.

Reference numeral 23 denotes a right side portion 22 of the cab box 22.
D is a door which is mounted to be opened and closed by sliding forward and backward, and which is opened and closed when an operator gets on and off the cab 21.

Reference numeral 24 denotes a front portion 22A of the cab box 22.
The upper windshield 25 provided on the cab box 22 is located below the windshield 24 and the lower windshield provided on the front portion 22A of the cab box 22. The windshields 24 and 25 are, for example, transparent. It is made of a transparent glass plate or the like, and secures a front view from inside the cab 21. Further, a wiper 26 is attached to the upper windshield 24 to remove water droplets adhering to the windshield 24 to improve the forward visibility in rainy weather.

Next, a configuration for protecting the windshield 24, the wiper 26 and the like from the cables and hoses 14 will be described.

27 is a ceiling portion 22E of the cab box 22
As shown in FIG. 5, the mounting bracket 27 has a U-shaped cross section using a steel material having an L-shaped cross section. Further, bolt insertion holes 27B, 27B are formed at the left and right ends of the bottom plate 27A of the mounting bracket 27, and screw holes 27D, 27D, 27D, 27D are located at the left and right sides of the front plate 27C. .. Are formed two by two. And the mounting bracket 27
Are bolts 2 inserted into the bolt insertion holes 27B, 27B.
8 and 28, the cab box 22 is mounted on front mounting seats 22F, 22F provided on a ceiling portion 22E of the cab box 22.

Reference numeral 29 denotes a front portion 22A of the cab box 22.
In the guard frame 29.
Is formed using a pipe material. Then, the guard frame 29, as shown in FIG.
4, a left vertical frame 30 extending upward and downward substantially along the left side, a right vertical frame 31 extending upward and downward substantially along the right side of the windshield 24, and a lower end of the left vertical frame 30 Frame 3 bent rightward and extending to the right, with the leading end fixed to the lower end of the right vertical frame 31
2 are roughly constituted. As shown in FIGS. 3 and 5, the upper side of each of the vertical frames 30 and 31 is bent rearward, and the front ends thereof are provided with mounting plates 30A and 31.
A is fixed, and bolt holes 30B, 30B, 31B, 31B are formed in the mounting plates 30A, 31A.
Further, abutment rubbers 33 are attached to the lower end of the left vertical frame 30 and the tip of the horizontal frame 32 so as to protrude rearward, that is, toward the front side of the cab box 22.

The guard frame 29 is formed by inserting bolts 34 into the bolt insertion holes 30B, 31B of the left and right mounting plates 30A, 31A and screwing the bolts 34 into the screw holes 27D of the mounting bracket 27. The upper side is mounted on the cab box 22 via the mounting bracket 27. In this state, the lower side of the guard frame 29 is pressed against the front surface 22A via the contact rubber 33.

A guard bar 35 is provided on the guard frame 29 so as to be movable upward and downward.
Is roughly constituted by a pipe member 35A and slide cylinders 35B, 35B fixed to both ends of the pipe member 35A. Each slide cylinder 35B is, as shown in FIG. , 31 are formed larger in diameter. Also, the slide cylinder 35B has
A nut 35C is fixed to an outer peripheral surface orthogonal to the pipe member 35A, and a thumb screw 36 serving as a male screw member for attaching the guard bar 35 to the guard frame 29 is screwed to the nut 35C.

Here, the guard bar 35 is attached to the outer periphery of the left and right vertical frames 30, 31 of the guard frame 29 by attaching the left and right slide cylinders 35B, 35B, and tightening the thumb screws 36, 36 in this state. It is attached to the left and right vertical frames 30, 31. Guard bar 3
5 can be moved upward and downward by loosening the thumb screw 36. Further, the thumbscrew 36 is arranged to be screwed from the rear side of the slide cylinder 35B, whereby the thumbscrew 36 is covered by the guard bar 35 when viewed from the front side.

The horizontal excavator according to the present embodiment has such a configuration, and its operation will now be described.

First, the operator who gets into the cab 21 can operate the lever in the cab 21 to drive the lower traveling body 1 and move to the work site. Next, when a waterproof wall is formed, the August screw type cutter 12 is driven by the driving device 11. Then, the work implement 10 is lowered by the elevating device 9, and the ground is excavated by the August screw type cutter 12. When the drill is excavated to a predetermined depth while adding the Auger screw type cutter, the working tool 10 is moved left and right along the guide frame 8 to form the deep groove 37. At this time, a waterproof wall can be continuously formed in the deep groove 37 by injecting mortar with a mortar injection device.

Here, when the waterproof wall is constructed, the slack portion 14A of the cables / hoses 14 moves in front of the cab 21. However, since the guard frame 29 and the guard bar 35 are provided on the front side of the cab 21,
It is possible to prevent the cables and hoses 14 from colliding with the windshield 24 and the wiper 26.

Thus, according to the present embodiment, since the guard frame 29 and the guard bar 35 are provided on the front surface 22A of the cab box 22 at the front of the windshield 24, the front of the cab 21 is moved. The windshield 24 and the wiper 26 can be protected from the cables / hoses 14, and can be prevented from being damaged to improve reliability.

In addition, the guard bar 35 is located at
Since it can move downward, it can be arranged at an optimum position in accordance with the slack portion 14A of the cables and hoses 14. Thereby, the windshield 24 is separated from the cables / hoses 14 by one guard bar 35.
And the like can be reliably protected, and a wide field of view can be provided to the operator, and workability can be improved.

The guard frame 29 and the guard bar 3
5 is formed using an inexpensive and lightweight pipe material, so that the weight can be reduced and the manufacturing cost can be reduced.

Further, since the thumb screw 36 for attaching the guard bar 35 to the guard frame 29 is arranged so as to be hidden behind the slide cylinder 35B when viewed from the front side, the cable / hose is attached to the thumb screw 36. The guard 14 can be prevented from being caught and the guard frame 29, the guard bar 35, the cable / hoses 14 and the like can be prevented from being damaged.

Next, FIG. 7 shows a second embodiment of the present invention. A feature of the present embodiment is that a cab for a pile driver is provided with a guard frame, a guard bar, and the like as a cab for a construction machine.

First, reference numeral 41 denotes a lower traveling body, 42 denotes an upper revolving body rotatably mounted on the lower traveling body 41, and a pile driving device 43 is attached to a front side of the upper revolving body 42. .

The upper revolving unit 42 includes the revolving frame 4
4, cab 45, counter weight 46, building cover 4
7, and is generally constituted by a switchboard 48 and the like.

Further, the pile driving device 43 is provided with a leader 4 provided on the front side of the revolving frame 44 so as to extend upward and downward.
9, a working tool 50 attached to the leader 49 so as to be movable upward and downward and comprising a screw 50A for drilling, a driving device 50B equipped with an electric motor and a speed reducer, and a back supporting the leader 49. The stay 51 is roughly configured. The electric motor of the driving device 50B includes:
The power cable 52 is connected, and the power cable 52 is
It is connected to the switchboard 48 in a state of hanging down from the front of the cab 45 via a drum 53 provided in the middle of the reader 49. The drum 53 may be provided on the back stay 51 instead of the reader 49.

Here, on the front side of the cab 45, a guard frame 5 is located in front of a windshield (not shown).
4. A guard bar 55 and the like are attached. The guard frame 54 and the guard bar 55 are mounted on the cab 45 similarly to the guard frame 29 and the guard bar 35 according to the first embodiment.
Can be protected from the power cable 52.

Thus, in the present embodiment configured as described above, similarly to the above-described first embodiment,
The guard frame 54 and the guard bar 55 connect the power cable 5 to a windshield or the like provided on the cab 45 of the pile driver.
2 can be protected, and the reliability can be improved.

In the embodiment, the guard frame 2
9 is screwed on the upper side to the ceiling portion 22E of the cab box 22 via the mounting bracket 27, and the lower side is
Although the configuration is such that the front surface 22A is pressed through the front 3, the present invention is not limited to this. For example, the lower side of the guard frame 29 may be screwed to the front surface 22A of the cab box 22.

In the embodiment, the guard frame 2
Although the case where one guard bar 35 is attached to 9 has been described as an example, a configuration in which a plurality of guard bars 35 are provided at intervals upward and downward, for example, may be used instead.

[0050]

As described in detail above, according to the first aspect of the present invention, a guard frame is provided on the front portion of the cab box, and the guard frame extends leftward and rightward at the front position of the windshield. , A guard bar that can move downward is attached. Therefore, for example, in a construction machine in which a horizontal digging device and a pile driving device are arranged on the front side of the cab, cables and hoses connected to these devices move on the front side of the cab during operation, but the guard frame And guard bars can protect the windshield from cables and hoses.

Moreover, since the guard bar can be moved upward and downward in its mounting position, the guard bar can be optimally arranged in accordance with the position where the cables and hoses are going to collide with the windshield. The windshield can be reliably protected from cables and hoses by one guard bar. Further, a wide field of view can be provided to the operator, and workability can be improved.

According to the second aspect of the present invention, the guard frame has left and right vertical frames extending upward and downward along both sides of the windshield, and the guard bar has both left and right vertical frames. Since it is configured to be movably mounted on the frame, the left and right vertical frames of the guard frame can prevent the cables and hoses from colliding with both sides of the windshield, that is, the left and right parts, and the guard bar Can prevent the cables and hoses from colliding with the central portion of the windshield.

According to the third aspect of the present invention, since the guard bar is attached to the guard frame using the male screw member screwed from the rear side, the guard bar can be easily attached to the guard frame using the male screw member. it can. Moreover, since the male screw member is screwed from the rear side of the guard bar, and is covered and arranged when viewed from the front side, cables and hoses are caught by the male screw member,
It is possible to prevent the guard frame, guard bar, cables and hoses from being damaged.

[Brief description of the drawings]

FIG. 1 is a front view showing a horizontal excavator applied to a first embodiment of the present invention.

FIG. 2 is a plan view of the horizontal excavator shown in FIG.

FIG. 3 is an enlarged front view showing the cab in FIG. 1 in an enlarged manner.

FIG. 4 is a right side view of the cab as viewed from a direction indicated by arrows IV-IV in FIG. 3;

FIG. 5 is an external perspective view showing a mounting bracket, a guard frame, a guard bar, and the like according to the embodiment.

FIG. 6 is an enlarged sectional view of a main part of a state in which the guard bar is attached to the guard frame using a thumbscrew, as viewed from the direction of arrows VI-VI in FIG.

FIG. 7 is a front view showing a pile driver applied to a second embodiment of the present invention.

[Explanation of symbols]

 21, 46 Cab 22 Cab Box 22A Front 22B Rear 22C Left Side 22D Right Side 22E Ceiling 24, 25 Windshield 26 Wiper 29, 54 Guard Frame 30 Left Vertical Frame 31 Right Vertical Frame 35, 55 Guard Bar 36 Thumbscrews ( Male screw member)

Claims (3)

[Claims] 1. A cab for a construction machine comprising: a cab box having a front portion, a rear portion, a left side portion, a right side portion, and a ceiling portion; and a windshield provided on a front portion of the cab box. A cab for a construction machine, wherein a guard frame is provided on a front portion of a box, and a guard bar extending leftward and rightward at a position in front of the windshield and movable upward and downward is mounted on the guard frame. 2. The guard frame has left and right vertical frames extending upward and downward along both sides of the windshield, and the guard bar can move both ends thereof to the left and right vertical frames. The cab for a construction machine according to claim 1, wherein the cab is attached to the cab. 3. The cab for a construction machine according to claim 1, wherein the guard bar is attached to the guard frame using a male screw member screwed from a rear side.