JPH07238573A - Driver's cab of construction machine - Google Patents

Abstract

PURPOSE:To provide a driver's cab of a construction machine which is constitut ed to have a wide frontward visual field and excellent workability. CONSTITUTION:A front window 11 is slidably mounted on the front of a driver's cab 3 of a hydraulic shovel. A hollow pipe material in the shape of a square in cross section is used as a frame 19 forming the outer frame of the front window 11 glass 14 is fixed on a flat surface 19a of the frame 19 by means of an adhesive 20. A belt-like resilient member 21 formed of a sponge and rubber is located between the flat surface 19a and the glass 14. This constitution reduces the width of the frame and reduces the dead angle of a window part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operator cab provided in a construction machine such as a hydraulic excavator, and more particularly to a window frame structure of the operator cab.

[0002]

2. Description of the Related Art FIG. 3 is a side view of a hydraulic excavator which is an example of a construction machine. In FIG.
Is an upper revolving structure, 3 is a driver's cab provided in the upper revolving structure 2,
Reference numeral 4 is a boom rotatably connected to the upper swing body 2, 5 is an arm rotatably connected to the boom 4, and 6 is an arm 5.
The boom 4 and the arm 5 and the bucket 6 constitute a front part of a bucket that is rotatably connected to each other. Reference numeral 7 is a boom cylinder that drives the boom 4, 8 is an arm cylinder that drives the arm 5, and 9 is a bucket cylinder that drives the bucket 6.
When an operator operates an operation lever (not shown) installed in the operator's cab 3, 8 and 9 are respectively driven according to the operation amount, and perform work such as excavation and cargo.

FIG. 4 is a front view of a part of a conventional driver's cab provided in such a hydraulic excavator as seen from the front side. In the figure, 10 is a pillar forming the skeleton of the operator's cab 3, and 11 is a pillar 10. A front window slidably attached to the front of the column, 12 is a ceiling fixed to the upper end of the column 10, and the column 10 is also provided with an entrance door, a side window, etc., which are not shown. FIG. 5 is an enlarged cross-sectional view taken along the line BB of FIG.
Reference numeral 13 is a frame having a U-shaped cross section which forms an outer frame of the front window 11, and 14 is glass fixed to an inner peripheral end of the frame 13 via an H-shaped rubber 15. The frame 13, the glass 14 and the rubber 15 are provided. And constitute the front window 11. 1
6 is a bracket fixed to the four corners of the frame 13,
Reference numeral 17 is a roller provided on each bracket 16, and 18 is a guide groove provided on the inner side surface of the support column 10. By guiding each roller 17 into the guide groove 18, the front window 1
1 can reciprocate between the front surface of the column 10 and the lower surface of the ceiling 12.

In the operator's cab 3 thus constructed, the operator operates the above-mentioned operating lever while observing the front posture and the work site through the glass 14 of the front window 11 to operate the front parts. Manipulate. Further, the front window 11 can be moved from the front surface to the lower surface of the ceiling 12 as necessary, and in that case, the front is visually observed without the glass 14.

[0005]

By the way, in the above-mentioned conventional driver's cab 3, since the front window 11 is slid with respect to the column 10, the frame 13 forming the outer frame of the front window 11 is used. Is required to have high strength, the frame 13
Is a channel material having a U-shaped cross section, its width must be increased. Also, such a frame 13
Since the glass 14 is fixed to the inner peripheral end of the rubber 14 via the rubber 15, the width L of the frame 13 and the rubber 15 is summed up.
₂ (see FIG. 5) becomes large, and a portion corresponding to the width dimension L ₂ becomes a blind spot, which impedes the operator's view.

The present invention has been made in view of the circumstances of the prior art as described above, and its purpose is to have a wide field of view in the front.
It is to provide an operator's cab of a construction machine with excellent workability.

[0007]

SUMMARY OF THE INVENTION The above-mentioned object of the present invention is to provide a rectangular pipe or the like as the frame in the cab of a construction machine in which a frame is installed at least in a window located on the front surface and glass is attached to the frame. This is achieved by using the hollow pipe material of No. 1 and fixing the glass to the pipe material.

[0008]

Since the hollow pipe material has high rigidity itself and sufficient strength is secured even if the width dimension is reduced, such a pipe material is used as a window frame and glass is used for the pipe material. When fixed, the blind spots in the window are reduced and the field of view is expanded.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view of a front window provided in a driver's cab of a hydraulic excavator according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along the line AA of FIG. 1, and corresponds to FIGS. The same reference numerals are given to the parts to be marked.

This embodiment is different from the above-mentioned conventional example in that
A hollow pipe material is used as a frame forming the outer frame of the front window, and glass is adhered and fixed to the flat surface of the pipe material, and the other configurations are basically the same. That is, in FIG. 1 and FIG. 2, 19 is a frame that forms an outer frame of the front window 11, and this frame 19 is made of a hollow pipe material having a quadrangular cross section. One flat surface 19 on the front side of the frame 19
A glass 14 is fixed to a by an adhesive 20, and a band-shaped elastic member 21 made of sponge, rubber or the like is provided between the flat surface 19a and the glass 14. The elastic member 21 extends inside the adhesive 20 along the frame 19, and has a function of preventing the adhesive 20 from protruding into the inside of the cab 3 and a function of damping the vibration transmitted to the glass 14. . Further, rollers 17 are attached to the four corners of the frame 19 via brackets 16, and each roller 17 is guided by the guide groove 18 of the column 10 in the same manner as in the conventional example described above, so that the front window 11 Can be reciprocated between the front surface of the column 10 and the lower surface of the ceiling 12.

In the above-described embodiment, the frame 19 forming the outer frame of the front window 11 is made of a rectangular pipe material, and the rectangular pipe material itself has a high rigidity. Therefore, the width dimension L ₁ ( Sufficient strength is ensured even if (see FIG. 2) is reduced. And such a flat surface 1 of the frame 19
Since the glass 14 is fixed to 9a using the adhesive 20,
The blind spot in the front window 11 is equivalent to the width dimension L ₁ of the frame 19, and for the operator who sees the front through the front window 11 from the inside of the operator's cab 3, the front field of view becomes wide and each front part is operated. The workability at the time can be improved. Further, the adhesive 2 is applied to the flat surface 19a of the frame 19.
When the glass 14 is fixed by using 0, the flat surface 19
Since the strip-shaped elastic member 21 made of sponge, rubber or the like is interposed between the a and the glass 14, the adhesive 20 is applied to the cab 3
Not only is it possible to prevent the elastic member 21 from protruding into the interior of the glass, but also the vibration transmitted to the glass 14 can be damped by the elastic member 21.

In the above embodiment, the case where the hollow pipe material having a rectangular cross section is used as the frame 19 has been described. However, the workability in adhering the glass 14 is slightly lowered, but other polygonal pipe materials are used. It is also possible to use a circular pipe material.

[0013]

As described above, according to the present invention,
A hollow pipe material is used as the frame of the window portion located at least in the front of the operator's cab, and the glass is fixed to the pipe material, so for the operator who sees the front through the window from the inside of the operator's cab, the window The blind spots on the front side are reduced and the front field of view is widened, and the workability when operating the front parts can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a front window provided in a driver's cab of a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a side view of a hydraulic excavator cited as an example of a construction machine.

FIG. 4 is a front view of a part of a conventional cab seen from the front side.

5 is an enlarged cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 1 Lower Traveling Body 2 Upper Revolving Body 3 Driver's Cab 4 Boom 5 Arm 6 Bucket 10 Support 11 Front Window 12 Ceiling 14 Glass 16 Bracket 17 Roller 18 Guide Groove 19 Frame 19a Flat Surface 20 Adhesive 21 Elastic Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toshiaki Nishida, Toshiaki Nishida, 650 Jinrachi-cho, Tsuchiura, Ibaraki Hitachi Construction Machinery Co., Ltd., Tsuchiura Plant (72) Inventor, Tomishige Yabuki, 650, Jinmachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Incorporated company Tsuchiura Plant (72) Inventor Akira Noguchi 1-2 Sasagaoka, Mizuguchi-cho, Koga-gun, Shiga Prefecture Toyo Co., Ltd. (72) Inventor Ken Iijima, 650 Kintate-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Stock Ceremony Company Tsuchiura factory

Claims (3)

[Claims] 1. A hollow pipe material is used as the frame in a driver's cab of a construction machine in which a frame is installed in at least a window located at the front surface and glass is attached to the frame, and the glass is fixed to the pipe material. The cab of a construction machine characterized by the above. 2. The cab of a construction machine according to claim 1, wherein the pipe material is a rectangular pipe having a flat surface. 3. The glass according to claim 2, wherein the glass is fixed to the flat surface of the pipe material with an adhesive, and a strip-shaped elastic member is provided between the glass and the flat surface of the pipe material. A cab of a construction machine characterized by.