JP2544738Y2 - Driver's cab front guard mounting structure for construction machinery - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention is applied to the front window of a cab of a construction machine having a working machine such as a hydraulic excavator and has a working machine in front thereof. The present invention relates to a front guard mounting structure for a cab in a construction machine for preventing a windshield from being damaged.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show a conventional front guard mounting structure. In the figures, a front window glass 2 is attached to the front of an operator's cab indicated by a reference numeral 1. FIG. In order to protect the lower half of the front window glass 2, front guards S are mounted on left and right front wall portions 3a and 3b which hold the front window glass 2.

The front guard S comprises a rectangular frame 4, a wire mesh 5 stretched on the frame 4, and L-shaped mounting brackets 6 fixed to the four corners of the frame 4 by welding or the like. . Then, the front guard S is detachably attached to the front part of the front window glass 2 by fastening the mounting brackets 6 at the four corners to the screw seats 7 fixed to the left and right front walls 3a and 3b with bolts 8. .

[0004]

However, the conventional mounting structure of the front guard S is, as described above, connected to the screw seats 7 of the left and right front wall portions 3a and 3b of the operator's cab 1 through the bolts 8 via the mounting brackets 6 at the four corners. As shown in FIG. 7, the driver's cab 1 is constantly vibrated and shocked during operation, as shown in FIG. ₁ ) and (0 ₂ ) as fulcrums, the displacement of the mounting parts (P ₁ ) and (P ₂ ) of the mounting bracket 6 located at the lower part of the guard S is small and there is no problem. Since the mounting portions (P ′ ₃ ) and (P ′ ₄ ) are largely displaced, stress concentration occurs and cracks occur in the mounting bracket 6 or the guard frame 4 to damage the guard S.

The present invention has been made for the purpose of remedying the above-mentioned conventional problems, and does not receive stress concentration due to the displacement of the cab, so that troubles such as cracks can be prevented. It is intended to provide a front guard mounting structure.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a windshield mounted on the front of the driver's cab, and the left and right fronts of the driver's cab for protecting the lower half of the windshield. In the rectangular front guard attached to the wall via the four corner mounting brackets, of the four corner mounting brackets, the lower left and right mounting brackets are fixed to the screw seats of the front wall by bolts, respectively. In addition, the left and right mounting brackets located at the upper part are movably fastened to the screw seats of the front wall, respectively, and a spacer is inserted into the screw part as a movably fastening means of the mounting bracket. It is.

[0007]

With this mounting structure of the front guard, the screw seat, the bolt and the spacer of the mounting portion at the upper position which receives the displacement of the driver's cab are displaced following the displacement, but the mounting bracket is relatively moved by the floating means. As a result, the mounting bracket is not subjected to stress concentration.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes an operator's cab. A front window glass 2 is provided on a front surface of the operator's cab 1 and front wall portions 3a and 3b are provided on both left and right sides of the front window glass 2. These are the same as the prior art. In front of the lower half of the front window glass 2, rectangular front guards S 'are provided on the left and right front wall portions 3.
The front guard S 'has the same configuration as that of the prior art, and has a rectangular frame 9 and a wire net 10 stretched thereon.

On the outer surfaces of the upper, lower, left and right four corners of the front guard S ', one pieces of mounting brackets 11a to 11d each having a substantially L-shaped cross section are fixed by welding or the like. Screw seats 12 corresponding to the mounting brackets 11a to 11d are fixed to the mounting portions of the front guards S 'of the left and right front wall portions 3a and 3b by welding or the like.

Next, when the front guard S 'is mounted, each of the mounting brackets 11a to 11d is fastened to each of the screw seats 12 with bolts 13. The left and right mounting brackets 11a and 11b located at the lower part are directly connected to the screw seats. A large diameter bolt hole 14 is formed in the left and right mounting brackets 11c and 11d which are in contact with the bolt 12 and are fastened and fixed by a bolt 13, and the bolt hole 14 has a radial flange portion. 15a, and mounting brackets 11c and 11d in the axial direction.
The spacer 15 and the washer 16 having the cylindrical portion 15b longer than the thickness are inserted, and the bolt 13 is inserted through these to be fastened to the screw seat 12.

Therefore, the mounting brackets 11c, 1 located on the upper part
As shown in FIG. 3, reference numeral 1d denotes a range of movement due to the difference between the bolt hole diameter (L ₁ ) and the spacer cylinder diameter (L ₂ ) in the radial direction, and the spacer cylinder length (T ₁ ) and the thickness of the mounting bracket in the axial direction. A floating range is formed by the difference of (T ₂ ), and the mounting brackets 11c,
Reference numeral 11d denotes a tightened state in which the float state is secured. Therefore, as described above with reference to FIG. 6, when the cab 1 is displaced by vibration or impact as shown by the shaded lines (I) and (II) in the figure, the upper mounting portion ( P
₃ ), (P ₄ ) is displaced to (P ′ ₃ ), (P ′ ₄ ) by this, and even if the screw seat 12, the bolt 13, and the spacer 15 are displaced, the mounting brackets 11c, 11d are relatively moved by the floating means. As a result, there is no possibility of stress being absorbed by displacement. Note that the lower left and right mounting brackets 11a and 11b have a small displacement and do not receive stress concentration even in a fixed mounting structure, and the upper mounting brackets 11c and 11d are brought into a floating state by fixing the lower mounting brackets 11a and 11b. I will support you.

FIG. 4 shows the spacer 15 and the mounting bracket 1.
A vibration-isolating rubber member 17 is interposed in a gap forming a floating range in the radial direction and the axial direction with respect to 1c and 11d, and the mounting bracket 11 is provided.
This shows an embodiment in which the generation of vibration noise due to the play of c and 11d is prevented.

[0013]

[Effect of the Invention] Since the present invention is configured as described above, stress concentration does not occur in the front guard mounting portion even when the operator's cab is displaced, so that occurrence of troubles such as cracks is prevented. Therefore, there is no need to manufacture a strong mounting bracket or guard frame, so it is inexpensive. In addition, it can be easily modified with only a few additional steps and spacers to the conventional front guard mounting part, which is effective in practical use. large.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a front guard mounted on a cab with a mounting structure according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of a part P in FIG. 2;

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is an overall perspective view showing a front guard mounted on a cab with a conventional mounting structure.

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

FIG. 7 is an explanatory diagram showing a state of a front guard attachment portion due to displacement of a cab.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operator's cab 2 Front window glass 3a, 3b Front wall S, S 'Front guard 6, 11 Guard mounting bracket 7, 12 Screw seat 8, 13 Bolt 15 Spacer 16 Washer 17 Anti-vibration rubber

Claims (3)

(57) [Scope of request for utility model registration] 1. A front window glass attached to the front of a driver's cab;
In a rectangular front guard attached to the left and right front walls of the driver's cab via four corner mounting brackets to protect the lower half of the front window glass, among the four corner mounting brackets,
The left and right mounting brackets located at the bottom are fixed to the screw seats on the front wall by bolts, respectively, and the left and right mounting brackets located at the top are each loosely fastened to the screw seats on the front wall. Front cab mounting structure of operator's cab in construction machinery. 2. A front guard mounting structure for a cab in a construction machine according to claim 1, wherein a spacer is inserted into a screw portion as a loosening means for allowing the mounting bracket to move freely. 3. The front guard mounting structure for an operator cab of a construction machine according to claim 2, wherein a vibration isolating rubber material is interposed in a fitting gap between the spacer and the mounting bracket.