JPS6221653B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a simple mechanism that is a robust device that can prevent accidents such as the lifting mechanism shaking from side to side and the entire vehicle body overturning when loading and unloading a load on the loading platform of a dump truck. The present invention relates to a dump truck lifting device constructed by the following.

The lifting plate and tension member, which are commonly used in conventional dump truck platform tilting devices using a link mechanism, are constructed by assembling pairs of members of the same shape lined up in parallel, so that the load can be moved in the side direction of the vehicle. When discharging a cargo by tilting the cargo platform on sloping terrain, the weight of the cargo platform increases as a result of receiving a lateral load proportional to the angle of inclination of the terrain.

At this time, the loading plate and the tension member may cause the platform to shift laterally due to their own deflection, gaps between shafts, etc., and deformation, so the platform may be twisted during unloading on a slope. There were often cases of accidents such as the entire vehicle overturning. It is an object of the present invention to overcome the deficiencies of such conventional assembly arrangements.

In the present invention, a loading platform 3 is pivotally supported on a vehicle platform 1 by a shaft 2 so as to be able to rise and fall freely, one end of a plurality of loading plates 9 connected by a back plate 10 is pivotally supported on the loading platform 3 by a pivot shaft 13, and the loading platform is 9, the upper end of the lifting cylinder 5, whose lower end is pivoted to the chassis 1 by a shaft 6, is pivoted by a shaft 12, and the upper end of the tension member 7, whose lower end is pivoted to the chassis 1 by a shaft 8, is connected to the chassis 1. The lifting cylinder 5 is pivotally supported on a shaft 11 provided at the free end of the plate 9.
This is a dump truck lifting device characterized in that the tension member 7 is provided so as to be able to pass through the space c or both side notches d.

To further explain the present invention, when there is a lifting plate having three pivot points, a tension member having two pivot points, and a lifting cylinder as a mechanical member for tilting and lifting a cargo platform pivotably supported on a vehicle platform by a link operation. , a dump truck assembled with a back plate fixed to the lifting plate outside of the three pivot points, and a space or cutout in a range that does not interfere with the link movement of the lifting cylinder in the tension member. This is a truck lifting device.

Further, in the above-mentioned device, there is provided a lifting device for a dump truck, in which the tensile material is divided at the center and assembled as paired members.

Alternatively, as shown in FIG. 6, an embodiment in which notches d are formed by cutting out both sides of the tensile member 7 to form holes in place of the hollows c, and two lifting cylinders 5 are used is also a configuration of the present invention. It is included in

To explain the embodiment of the present invention in detail with reference to FIGS. 1 to 6, the structure is as follows: 1 is a vehicle chassis, an axis 2 is a cargo platform 3;
It is pivotally connected. Reference numeral 4 denotes a support member fixedly provided to the vehicle chassis 1. The bottom of the lifting cylinder 5 is pivotally connected to the shaft 6, and the lower end of a tension member 7, which will be described later, is pivotally connected to the shaft 8. Reference numeral 7 denotes a tensile material, and a notch d is provided in the center of the single-lifting cylinder type, and at both outer sides of the double-lifting cylinder type shown in FIG. There is. This tensile material 7
The space c provided in the space C has a triangular shape as shown in Fig. 3, an elliptical shape as shown in Fig. 4, and a rhombic shape as shown in Fig. 5. In particular, in the case of a double-loaded cylinder type, the tension member itself is closed as shown in Fig. 6. It is possible that the shape is a tsuzumi shape.

Further, the tensile member 7 may be molded integrally or may be vertically divided at the center and assembled into pairs.

Next, when the shafts 6 and 8 are assembled coaxially, a lifting mechanism is obtained by assembling them using a triangular shape as shown in FIG.

Reference numeral 9 denotes a hanging plate having three pivot points, and the lower end pivot point is pivotally connected above the aforementioned tension member 7 by a shaft 11. The upper end pivot shaft 13 is pivotally connected to a bearing 14 fixed to the cargo platform 3. The remaining central pivot point is pivotally connected to the raised end of the lifting cylinder 5 and the shaft 12.

The noteworthy structure of the hanging plate 9 is that the rear plate 1 is attached to the entire length and width of the outer upper surface of the three pivot shafts of the hanging plate 9.
0 is fixedly provided.

Note that the back plate 10 can be divided at the position of the shaft 12 and fixed with the divided back plate 10 so as to prevent distortion of the loading plate 9.

Next, on a slope, the case where the vehicle is stopped perpendicular to the slope line and the vehicle is unloaded with the vehicle tilted to the left (or right) will be explained using Fig. 3.
The loading platform 3 is tilted to the left, a component force P due to the inclination of the loading platform is applied from the right side of the shaft 11, and the shaft 8 located below is supported on the left side opposite to the component force P applied to the shaft 11. The force P acts on the tensile member 7, and the tensile member 7 becomes twisted, and a shearing force Q is generated due to the twisting. Even if these acting forces act on the tensile member 7,
Since the tensile member 7 has a plate shape, it has rigidity, and the upper end of the tensile member 7 is supported by the rigid structure of a plurality of hanging plates 9 and a back plate 10 fixed to the hanging plates 9. Breakage of the shaft 11 is avoided, and
Since the state of the loading plate 9 is also maintained normally, unloading work can be carried out safely. By connecting the functions and effects of these two members and assembling the shaft between the loading platform 3 and the vehicle chassis 1, the loading platform 3 can be prevented from shifting relative to the chassis 1 when unloading on uneven ground or other sloping land. Since the effect can be suppressed to a minimum, the object of the present invention can be fully achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the invention, FIG. 2 is a front view of the back plate, and FIG.
Figures 4 and 5 are front views of the tension member showing the shape of the space, Figure 6 is a front view of the tension member with cutouts on both sides, and Figure 7 shows the loading cylinder and the tension member. It is a front view provided on the same axis. 1 is the chassis, 2 is the shaft, 3 is the loading platform, 4 is the support material, 5
is a heavy cylinder, 6 is a shaft, 7 is a tensile material, 8 is a shaft,
9 is a hanging plate, 10 is a back plate, 11 is a shaft, 12 is a shaft, 13 is a pivot shaft, 14 is a bearing, and C and d are spaces.

Claims (1)

[Scope of Claims] 1. The rear of the loading platform is pivotally supported by a shaft at the rear of the vehicle chassis so as to be able to rise and fall freely, and a plurality of hanging plates in the hanging direction are fixed to the back plate,
One end of the lifting plate is pivoted to the middle of the loading platform, and the lower end of the lifting cylinder is pivoted to the vehicle chassis.The upper end of the lifting cylinder is pivoted to the middle of the loading plate, and the lower end is pivoted to the chassis. The upper end of the material is pivoted to the free end, which is the other end of the tensioning plate, and the tensioning cylinder is connected to the tensioning cylinder by passing through a central space or notches formed on both sides of the tensioning material. A lifting device for a dump truck, characterized in that the materials intersect with each other in an X-shape. 2. The dump truck hoisting device according to claim 1, wherein the tension member is plate-shaped, and the left and right sides are divided into substantially the same shape.