JP4188219B2 - Front panel structure of a three-wheel dump truck - Google Patents

Description

  The present invention relates to a structure of a front panel erected on a front edge of a cargo box that is selectively tilted rearward or left and right in a three-turn dump truck.

Conventionally, in a dump truck, a front panel that covers the rear of the driver's seat is erected on the front edge of the cargo box, and multiple transparent windows are opened on the front panel, and the rear view of the cargo box is secured through these transparent windows. (See Patent Documents 1 and 2).
Japanese Utility Model Publication No. 60-36342 Japanese Utility Model Publication No. 50-81517

  By the way, as for what is disclosed by the said patent documents 1 and 2, since all the several see-through windows established in the front panel are arranged in parallel at the same height, these see-through windows are placed behind the packing box. Alternatively, when implemented on the front panel of a tri-turn dump truck that can be selectively tilted to the left and right sides, when the cargo box is tilted to the left and right sides, the rear of the cargo box from the driver's seat through the fluoroscopic window There is a problem that it is difficult to ensure visibility.

  The present invention has been made in view of such a point, and in any case where the packing box is tilted rearward or sideways, a rear view of the packing box from the driver's seat can be secured. An object of the present invention is to provide a front panel structure of a tri-turn dump truck.

  In order to achieve the above object, the invention according to claim 1 is mounted on the chassis frame behind the driver's seat so that the cargo box can be selectively tilted rearward or both right and left sides, and the front edge of the cargo box In addition, in the three-wheeled dump truck having a front panel that covers the rear surface of the driver's seat, a central see-through window is provided in the center of the front panel, and side see-through windows are provided on both left and right sides thereof, and the side see-through is provided. The window is characterized by being positioned lower than the central see-through window.

  According to the features of the first aspect of the present invention, it is possible to secure a rear view from the driver's seat regardless of whether the cargo box is tilted rearward or leftward or rightward, and the situation around and inside the cargo box can be easily and quickly performed. This makes it possible to safely perform work such as unloading work. Further, by arranging the side see-through window at a lower position than the center see-through window, it is possible to sufficiently secure the rigidity of the front panel and enhance the driver seat protection function.

  In addition, by arranging the side see-through window at a lower position than the center see-through window, the size of the side see-through window and the center see-through window can be made as small as possible. By doing so, the rigidity of the front panel can be further enhanced, and soil and sand can be prevented from spilling out from the side and central part see-through windows.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention shown in the accompanying drawings.

  FIG. 1 is a side view of a three-wheeled dump truck having a front panel structure according to the present invention, FIG. 2 is a rear view of the three-wheeled dump truck shown in FIG. 1, and FIG. 3 is an enlarged view taken along line 3-3 in FIG. 4 is an enlarged cross-sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a rear view when the cargo box is tilted sideways at a small angle, and FIG. 6 is when the cargo box is tilted sideways at an intermediate angle. FIG. 7 is a rear view of the packing box when it is tilted sideways at the maximum angle.

  In FIGS. 1 and 2, a sliding frame F of a three-wheeled dump truck is configured by placing and fixing a subframe S on a main frame M. A driver's seat C is mounted at the front of the main frame M, and a side door 1 having a side window 2 and a rear window 3 are provided on the left and right sides of the driver's seat C as usual. Further, side mirrors 5 are respectively provided on the left and right front portions of the driver's seat C via support bars 4.

  Behind the driver's seat C, a cargo box V is mounted on the subframe S so as to be selectively tiltable to the left, right both sides, and rear. A front panel 10 covering the rear surface of the driver's seat C is integrally provided on the front edge of the packing box V, and side doors 11 are provided on the left and right side edges of the packing box V so as to be openable and closable. The rear door 12 is provided at the rear edge of the packing box V so as to be openable and closable.

  A pair of left and right front hinge mechanisms Hf, Hf, which are hinged to the subframe S so as to be detachably connected to the front and rear sides of the left and right sides between the cargo box V and the subframe S, and Left and right rear hinge mechanisms Hr, Hr are provided, and a box tilting device DV having a dump cylinder CD is connected between the subframe S and the box V, and the left and right front hinge mechanisms Hf, Hf and left and right Of the rear hinge mechanisms Hr, Hr, the left front and rear hinge mechanisms Hf, Hr are both locked and the right front and rear hinge mechanisms Hf, Hr are both unlocked to extend the dump cylinder CD. If driven, the cargo box V can be tilted to the left side, and the front and rear hinge mechanisms Hf and Hr on the right side are both locked and left If the dump cylinder CD is extended and driven by operating both the front and rear hinge mechanisms Hf and Hr of the cylinder to the unlocked state, the cargo box V can be tilted to the right, and the left and right rear hinge mechanisms Hr and Hr can be When the left and right front hinge mechanisms Hf, Hf are operated in the unlocked state and the dump cylinder CD is driven to extend, the cargo box V can be tilted backward.

  Since both the front hinge mechanism Hf and the rear hinge mechanism Hr are conventionally known, detailed description thereof is omitted.

  As shown in FIGS. 3 and 4, the packing box tilting device DV is connected to a pair of lift links 21 and 21 and a pair of tension links 22 and 22 that are provided to be spaced apart in the left-right direction. And a single-acting dump cylinder CD.

The pair of tension links 22, 22 are below the lift links 21, 21, and one end (front end) of the tension links 22, 22 is connected to the subframe S of the palm frame F, the first trunnion 23, and the first connecting shaft 24. Through a longitudinal axis l-l in the front-rear direction and a horizontal axis t-t in the left-right direction so as to be rotatable.
In addition, the other ends (rear ends) of the pair of lift links 21 and 21 are connected to the other ends (rear ends) of the pair of tension links 22 and 22 via a connecting shaft 25 so as to be rotatable up and down. . The lift links 21, 21 extend forward along the tension links 22, 22, and one end (front end) of the lift links 21, 21 is connected to the cargo box V via the second trunnion 26 and the second connecting shaft 27 in the front-rear direction. It is connected so as to be rotatable about a vertical axis l-l and a horizontal axis t-t in the left-right direction.

  One end of the dump cylinder CD is pivotally connected to the front portions of the pair of tension links 22 and 22 via a support shaft 28, and a support shaft 29 is attached to the rear portions of the lift links 21 and 21. The other end of the dump cylinder CD is connected to be rotatable in the vertical direction. According to the extension operation of the dump cylinder CD, the lift links 21 and 21 stand up around the connecting shaft 25, and the tension links 22 and 22 stand up around the first trunnion 23 and tilt the cargo box V. it can. At this time, the tension links 22 and 22 are allowed to rotate left and right with respect to the subframe S via the first trunnion 23, and the lift links 21 and 21 are also loaded via the second trunnion 26. As described above, when the packing box V tilts to the left or right side, the packing box tilting device DV is left and right so as to follow the tilting. Can be rotated.

  As shown in FIGS. 2 and 5 to 7, the front panel 10 erected on the front edge of the cargo box V is formed in a trapezoidal shape when viewed from the front-rear direction, and the rear surface intermediate portion is spaced from side to side. A pair of reinforcing girders 31 extending in the vertical direction are fixed and reinforced. On the upper side of the intermediate portion between the pair of reinforcing girders 31 of the front panel 10, a pair of left and right central see-through windows 33, 33 are provided symmetrically with respect to the longitudinal center line LL of the front panel 10, Further, the left and right sides of the front panel 10 outside the reinforcing beam 31 are symmetrical with respect to the longitudinal center line LL of the front panel 10 at positions lower than the central see-through windows 33 and 33. Are provided with a pair of left and right side see-through windows 34, 34. Each of the central and side see-through windows 33, 33; 34, 34 is formed in a substantially rectangular shape with a plurality of slits s arranged in parallel in the left-right direction at intervals. As shown in FIG. 2, when the cargo box V is in the traveling position, the entire central see-through window 33 and a part of the side see-through window 34 face the rear window 3 of the driver's seat C. Further, as shown in FIGS. 5 to 7, when the cargo box V is tilted sideways from the travel position to the maximum tilt angle, the locus drawn by the upper edge of the side see-through window 34 is the upper and lower middle portions of the side mirror 5. The vertical positional relationship between the side see-through window 34 and the side mirror 5 is determined so that the trajectory drawn by the lower edge of the side see-through window 34 passes below the side mirror.

  Next, the operation of this embodiment will be described.

  Now, when the cargo box V is tilted rearward, the driver sees the central see-through windows 33 and 33 and the side see-through windows of the front panel 10 in the same manner as disclosed in Patent Documents 1 and 2. 34, 34, the side window 2 of the side door 1 of the driver's seat C, and the side mirror 5 can secure the rear view of the driver's seat C, the tilting situation of the cargo box V, the load of the cargo box V It is possible to easily confirm the surroundings of the packing box V such as the unloading state and the state of the inside thereof.

  Next, when the packing box V is tilted to the left or right side, for example, as illustrated in FIGS. 5 to 7, the case where the packing box V is tilted to the right side will be described (when the packing box V is tilted to the left side. In the case where the cargo box V is tilted to the side of the small angle, the intermediate angle, and the maximum angle, the driver is not obstructed by the front panel 10 and the side door 1 of the driver's seat C is not obstructed. A rear view can be secured from the side window 2 and the side mirror 5 through the side see-through window 34, so that the surroundings of the packing box V such as the tilted state of the packing box V and the unloading state of the packing box V, The internal situation can be easily confirmed.

  Further, in the front panel 10, the side see-through windows 34, 34 are arranged lower than the central see-through windows 33, 33, thereby disposing them in series in the lateral direction, disclosed in Patent Documents 1 and 2 above. The rigidity of the front panel 10 itself can be increased as compared with the above-mentioned ones, and the protective action of the driver's seat C can be enhanced. In addition, the piles in the packing box V are piled up when the earth and sand are loaded in the packing box V. There is no concern that the earth and sand that has been spilled through the central see-through window 33 and the side see-through window 34.

  In addition, by arranging the side see-through window at a lower position than the center see-through window, the size of the side see-through window and the center see-through window can be made as small as possible. By doing so, the rigidity of the front panel can be further enhanced, and soil and sand can be prevented from spilling out from the side and central part see-through windows.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

  For example, in the above-described embodiment, the case where the central see-through window 33 and the side see-through window 34 are formed by a plurality of slits has been described. It may be formed.

Side view of a tri-turn dump truck equipped with a front panel structure of the present invention Rear view of the three-wheeled dump truck as seen in the direction of arrow 2 in FIG. Enlarged cross-sectional view along line 3-3 in FIG. Enlarged cross-sectional view along line 4-4 in FIG. Rear view of the packing box when tilted sideways at a small angle Rear view of middle angle side dump of packing box Rear view of the maximum angle side dump of the packing box

Explanation of symbols

10 ·································································································・ Driver seat F ... Chassis frame V ... Packing box

Claims (1)

On the chassis frame (F) behind the driver's seat (C), the cargo box (V) is mounted so that it can be selectively tilted rearward or on the left and right sides, and on the front edge of the cargo box (V), (C) In a three-wheel dump truck in which a front panel (10) covering the rear surface is erected,
A central see-through window (33) is provided at the center of the front panel (10), and side see-through windows (34) are provided on both left and right sides thereof, and the side see-through window (34) is the center see-through window (33). The front panel structure of a tri-turn dump truck, characterized by being located lower than

Images