JPS6337307Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a split-type loading platform consisting of a plurality of loading platforms pivotally connected by connecting pins on the chassis frame of a vehicle. It is movably mounted, and when loading or unloading heavy equipment such as a bulldozer, the loading platform is moved to the rear of the vehicle, the loading platform on the rear side is pushed out from the chassis frame in a downward slope, and is grounded. This invention relates to a freight vehicle with a movable loading platform that is used as a thick material for loading and unloading heavy equipment.

(Prior Art) In this type of freight vehicle with a movable cargo bed, the rear cargo bed is projected backward from the chassis frame in a downwardly inclined state and touches the ground to form the rear cargo bed. When loading and unloading heavy objects along a slope, the rear of the vehicle moves up and down due to load fluctuations due to the heavy objects, which is dangerous.
As shown in Japanese Unexamined Patent Publication No. 106244 or Japanese Utility Model Publication No. 108931/1983, the central portion of the rear loading platform is supported when it touches the ground. However, each of these known examples has points to be improved as described below.

That is, the first
In the known example, as shown in FIG. 3, a loading platform 42 consisting of a front loading platform 43 and a rear loading platform 44 connected by a connecting pin 45 is mounted on a chassis frame 41 of a vehicle 40 so as to be movable in the longitudinal direction of the vehicle. At the same time, a ground plate 5 is attached to the rear end 41a of the chassis frame 41.
A lever member 46 having a grounding leg 47 with 8 attached to its one end 46a is attached to be pivotable in the vertical direction by a fulcrum pin 48, and when the second cargo platform 44 is tilted, the grounding leg 47 is grounded to lower the second cargo platform 44. It is designed to support the middle part of the However, in this first known example, as shown in FIG.
When set to the running position, the lower end 4 of the grounding leg 47
7a is the lowest end 41 of the chassis frame 41
Since the rear wheel 5 is projected downward from a
2, 52 and the lower end of the ground plate ₄₈ with respect to the floor surface, that is, the departure angle θ cannot be set too large, and as a result, when driving on an uneven road such as a slope. Ground plate 5 when
8 is easily damaged by contact with the road surface.

In addition, in FIG. 3, the reference numeral 51 is a roller for moving the loading platform.

A second known example disclosed in Japanese Utility Model Application No. 56-108931 is attached to the rear end 41a of the chassis frame 41 of the vehicle 40 so as to be pivotable in the vertical direction, as shown in FIG. The first link 53 and the rear loading platform 4
A ground plate 58 is pivotally attached to a connecting portion with a second link 54 which is pivotably pivoted in the vertical direction at an intermediate position in the longitudinal direction of the ground plate 58.

However, in this second conventional example,
The second loading platform 44 is moved from the working position shown in FIG. 4 to the chassis frame 4 by an appropriate drive device (not shown).
4 and move it to the front side of the chassis frame 41 integrally with the first loading platform 43,
The axis l ₂ of the second link 54 is the perpendicular line l ₁ of the second loading platform 44
Since it is tilted rearward at an angle α, the pulling force applied in the axial direction of the second loading platform 44
F ₀ is the axial pressure F ₁ of the second link 54 that does not contribute to the lifting action of the second loading platform 44, and the second link 54 is rotated in the direction of arrow A to lift the second loading platform 44 upward. The acting tangential force F ₂ is divided into two components. Therefore, the driving capacity (lifting force) of the drive device is as follows: than the force, the axial pressure F ₁ and the second
An extra force is required to lift the loading platform 44 upward (vertical component of the tangential force _F2 ) (in other words, in order to store the ground plate 58 from the grounded state to the chassis frame 41 side). (a large pulling force F ₀ must be applied to the second loading platform 44), resulting in a problem that the drive device becomes larger and heavier and costs increase.

(Purpose of the invention) In view of the above-mentioned problems of conventional freight vehicles with a movable cargo bed, the present invention allows posture control of the ground landing leg to be easily controlled with less operating force, and also allows the departure angle of the vehicle to be adjusted. The purpose of this invention is to provide a truck with a movable cargo bed that can be large in size and has high operational safety when loading and unloading cargo.

(Structure of the invention) The present invention provides a first loading platform which is mounted on the chassis frame of a vehicle and is connected to the rear end of the first loading platform, which is driven forward and backward along the chassis frame by an appropriate drive device. A split-type loading platform is mounted thereon, and includes a second loading platform that is pivotally connected in the vertical direction by a pin, and when the loading platform is in the forward position, both the first loading platform and the second loading platform are connected to the chassis frame. In the truck with a movable cargo bed, the second cargo bed is located above the cargo bed, and the second cargo bed is installed in an inclined state between the rear end of the chassis frame and the floor surface when the cargo bed is in a retracted position. Appropriate engaging elements are protruded from appropriate positions on the second loading platform, and at the rear end of the chassis frame, there are ground legs that are pivotably supported in the vertical direction by means of fulcrum pins; When the loading platform is moved forward, the grounding legs are engaged with the engaging elements of the second loading platform, and when the loading platform is moving forward, the grounding legs are rotated upward and stored in the chassis frame. The present invention is characterized by the provision of an appropriate grounding leg rotation operating member that operates to swing the grounding leg downward from the chassis frame side and touch the ground on the floor surface.

(Embodiment) FIGS. 1 and 2 show a truck Z with a movable cargo platform according to an embodiment of the present invention. This freight vehicle Z is constructed by mounting a cargo platform 3, which will be described later, on a chassis frame 2 of a vehicle 1 so as to be movable in the front and rear directions along the chassis frame 2. The chassis frame 2 is formed into a bent girder shape in which a rear end portion 2b extending rearward from the rear wheel 25 is bent at an appropriate angle so as to be inclined downward toward the rear, and the upper surface of the horizontal portion 2c is a horizontal guide surface 2c, and the upper surface 2d of the inclined portion is an inclined guide surface 2d. Further, on the horizontal guide surface 2c of the chassis frame 2, a guide rail 8 is attached over almost the entire length thereof and serves as a guide member for a first loading platform 4, which will be described later.

The loading platform 3 includes a first loading platform 4 that is horizontally moved in the front-rear direction (arrow E-F direction) along a guide rail 8 attached to the chassis frame 2, and a rear end portion 4b of the first loading platform 4. It has a second loading platform 5 connected to the rear of the second loading platform 4 so as to be pivotable in the vertical direction by a connecting pin 6.

The first loading platform is formed into a plate-like body having a loading platform surface 4c approximately half the length of the chassis frame 2, and a plurality of rolling rollers 9, 9 are provided on the bottom side of the first loading platform.
..., and a slide cylinder 7 for driving the loading platform is installed between the rear end 4b and the front part 2a of the chassis frame 2. By expanding and contracting the slide cylinder 7, the first loading platform 4 is guided by the guide rail 8 and can be moved to a forward position located on the front 2a side of the chassis frame 2 as shown in FIG. In this manner, the rear end portion 4b is appropriately moved forward and backward between two positions, including a retracted position extending slightly rearwardly from the horizontal guide surface 2c of the chassis frame 2.

The second loading platform 5 is a plate-shaped body having a loading surface 5d that is approximately the same length as the first loading platform 4, and a rear end portion 5b.
is used as the grounding portion 5c. The second loading platform 5 has a guide roller 9 attached to the bottom surface of the approximately central portion thereof, similar to the first loading platform 4, and fixed support legs 21 to the lower surface of the rear end portion 5b. 1
When the loading platform 4 is positioned at the forward position,
The guide roller 9 is shown in solid line in FIG.
is mounted on the chassis frame 2 with the supporting legs 21 in contact with the horizontal guide surface 2c of the chassis frame 2 and the inclined guide surface 2d, and in this case, the second loading platform 5 The dead weight of the second loading platform 5 and the dead weight of the loaded object on the second loading platform 5 are supported by the guide rollers 9 and the support legs 21. Such a loading platform 3
The state is the state when the vehicle is running, and in the following explanation, it will simply be referred to as the state when the vehicle is running.

On the other hand, when the first loading platform 4 moves from the forward position to the retreating position with the extension of the slide cylinder 7, the second loading platform 5 moves while its guide roller 9 is on the horizontal guide surface 2c of the chassis frame 2. As shown by the chain line (5') in FIG. 1, the guide roller 9 is moved horizontally backward together with the first loading platform 4, and the guide roller 9 moves from the horizontal guide surface 2c to the inclined guide surface 2c.
d, it is gradually tilted downward around the connecting pin 6, and near the time when the first loading platform 4 is positioned in the retreat position, the grounding portion 5c formed on the rear end portion 5b as shown in FIG. While the chassis frame 2 is in contact with the floor,
It is constructed in an inclined manner between the two. At this time, the guide roller 9
is in contact with the inclined guide surface 2d of the chassis frame 2, but the supporting leg 21 is positioned above the floor (not in contact with the ground). In the following description, such a state of the loading platform 3 will be referred to as a working state.

When the loading platform 3 is set in the working state as shown in Fig. 2, and heavy machinery such as a bulldozer is loaded onto the first loading platform 4 through the second loading platform 5 in this state, the shear shunt may occur due to load fluctuations caused by the heavy machinery. As mentioned above, the rear end portion 2b of the frame 2 moves up and down, which is dangerous. For this reason, in the truck Z of this embodiment, a grounding device 10, which will be described later, for supporting the live load is attached to the rear end portion 2b of the chassis frame 2.

The grounding device 10 includes an engager 18 (described later) attached to the second loading platform 5 and a rear end portion 2 of the chassis frame 2.
It has a link lever 15 and a grounding leg 12, which will be described later, and which are attached to b.

The grounding leg 12 is a columnar body with the grounding plate 11 attached to one end 12b, and the other end 12a of the grounding leg 12 is connected to the rear end 2b of the chassis frame 2.
It is pivotably supported in the vertical direction (arrow A-B direction) with respect to a support pin 13 attached to the support pin 13 attached to the support pin 13 . This ground leg 12 is connected to the ground leg 1 by a link lever 15 and an engaging element 18, which will be described later.
2 is raised in the direction of arrow A so that it is located above the straight line L connecting the center of the rear wheels 25, 25 of the vehicle 1 and the lowest end of the chassis frame 2 (that is, the inclined straight line forming the departure angle θ). It is selectively positioned in two positions: a stored position, which is suspended from the fulcrum pin 13, and a working position, in which the ground plate 11 is in contact with the floor, as shown in FIG. still,
The rotation of the grounding leg 12 in the direction of arrow B is restricted by a second stopper 20 attached to the rear side of the chassis frame from the fulcrum pin 13. side 1
When 2c is engaged in the direction of arrow B, the grounding leg is automatically positioned in the working position.

The link lever 15 is a lever member bent into an L-shape, and has a fulcrum pin 14 attached to the chassis frame 2 at a position closer to the front of the chassis frame by an appropriate dimension than the fulcrum pin 13 of the ground leg 12. The bent portion 15e is pivotably supported by the bending portion 15e. One end 15a of this link lever 15 is connected to the grounding leg 1 via a link bar 17.
It is connected to the middle part of 2. Further, a spring 16 is attached to the other end 15b of the link lever 15, and the link lever 15 is always urged in the direction of arrow C by the spring force of the spring 15. The spring force of the spring 16 is such that when the grounding leg 12 is rotated from the stored position in the direction of arrow B due to its own weight moment and set to the working position, the spring force of the spring 16 is
The spring force is such that the impact force of 2 can be appropriately alleviated.

The link lever 12 is rotated as appropriate by an engager 18 that projects downward from the lower surface of the second loading platform 5 as the second loading platform 5 moves forward and backward. That is, this link lever 15 is disengaged from the engaging member 18 of the second loading platform 5 when the loading platform 3 is in the operating state as shown in FIG. The ground leg 12, which is rotated to the side, is rotated in the direction of arrow D via the link lever 17, and is positioned at the lever position during work. In this case, chassis frame 2
The second stopper surface 19b of the first stopper 19 provided at the link lever 15 engages with the link lever 15 in the direction of arrow D, thereby accurately positioning the link lever 19 at the lever position during operation.

On the other hand, when the state of the loading platform 3 shifts from the working state to the traveling state, the engaging element 18 protruding from the second loading platform 5 is moved as shown by the chain line in FIG.
8'), as the second loading platform rotates, it is lifted up one level and then horizontally moved to the position shown by the solid line in FIG. At this time, the second side surface 15d on the spring 16 connection side of the link lever 15, which has been positioned at the lever position during operation, engages with the engager 18 in the direction of arrow E, and the link lever 15 is moved to the second loading platform 5. Arrow C as you move
When the second loading platform 4 is positioned for traveling, it is positioned at the lever position for traveling as shown in FIG. When the link lever 15 is positioned at the running lever position, the grounding leg 12 is also rotated in the direction of arrow A via the link bar 17, and is automatically positioned at the running position.

When the link lever 15 is positioned at the running lever position, the first
The first engaging surface 19a of the stopper 19 and the link lever 15 engage with each other in the direction of arrow C, and rotation of the link lever 15 in the direction of arrow C is restricted. Moreover, at this time, the engaging element 18 is also engaged with the second side surface 15d of the link lever 15 and the first side surface 15c on the connecting side of the link bar 17 at the same time as the first stopper 19. Free rotation of the grounding leg 15, in other words, the rocking of the grounding leg 12 due to vibrations during running is restricted.

Next, to briefly explain the operation of the grounding device 10 in the freight vehicle Z of the illustrated embodiment, first, when moving the loading platform 3 backward from the traveling state in the direction of arrow F and positioning it to the working state, the first As shown in the figure, the link lever 15 is positioned at the lever position during traveling by the engager 18 and the engager 18.
When the second loading platform 5 retreats, the engagement state with the grounding leg 12 is released, and the grounding leg 12 loses the restraining force in the direction of arrow B against the grounding leg 12, so it automatically rotates in the direction of arrow B due to its own weight moment. is set to the working position.

On the other hand, when moving the loading platform 3 forward from the working state in the direction of arrow E and positioning it in the traveling state, the link lever 15 and the engager that had been positioned at the working lever position as the second loading platform 5 moves. 18 is engaged again, the link lever 15 is rotated from the operating lever position to the traveling lever position, and the grounding leg 12 is accordingly positioned from the operating position to the retracted position.

That is, in the truck Z of this embodiment,
The attitude of the grounding leg 12 can be controlled with a smaller operating force (that is, the moving force of the loading platform 3).

Furthermore, when the retracted position of the grounding leg 12 is set above the departure angle line L as in this embodiment, the departure angle θ is set to the maximum allowable angle regulated by the structure and shape of the chassis frame. It is possible to expand up to

(Effect of the invention) The truck with a movable loading platform of the present invention has a first loading platform that is movable in the longitudinal direction along the chassis frame of the vehicle, and a rear end portion of the first loading platform that is pivoted on the chassis frame of the vehicle. It is equipped with a split-type loading platform consisting of a second loading platform that is movably connected, and when loading and unloading heavy machinery such as bulldozers, the loading platform is moved backward and the second loading platform is erected in an inclined manner between the chassis frame and the floor. In a freight vehicle with a movable loading platform that is used as a thick end plate, a grounding leg that supports the middle part of a second loading platform installed in an inclined manner between the chassis frame and the floor is attached to the back of the chassis frame. The grounding leg is pivotably attached to the end, and is moved to the working position via a link lever that engages with an engager provided on the second loading platform and is displaced as appropriate when the second loading platform is moved. Alternatively, since it is positioned at the stored position, the conventional example shown in Fig.
56-10893), in which the moving direction and moving force of the cargo platform change when the ground plate 58 is retracted, the effect is that the posture of the ground leg can be easily controlled with a smaller operating force.

Furthermore, since the grounding leg is pivotally attached to the rear end of the chassis frame, when the vehicle is running, the grounding leg is stored in a state where it is pulled up to the chassis frame side as much as possible. This also has the effect of making the departure angle of the vehicle as large as possible.

Furthermore, since a grounding leg is attached to the rear end of the chassis frame and the rear end of the chassis frame is directly supported by the grounding leg, the middle part of the second loading platform is grounded, as in the above-mentioned known example. Compared to the case where the chassis frame is supported by legs, the vertical movement of the rear end of the chassis frame due to changes in load conditions due to the load can be more effectively suppressed, which makes it easier to load and unload the load. This also has the effect of improving work safety.

[Brief explanation of the drawing]

Figure 1 is a side view of a truck with a movable loading platform according to an embodiment of the present invention, Figure 2 is a state change diagram of the truck shown in Figure 1, and Figures 3 and 4 are conventional trucks with a moving loading platform. FIG. 2 is a side view of the main parts of a freight vehicle. 1... Vehicle, 2... Chassis frame, 3...
Loading platform, 4...First loading platform, 5...Second loading platform, 12...
...Grounding leg, 13...Fully pin, 15...Link lever, 18...Engager.

Claims (1)

[Scope of utility model registration request] A first loading platform 4 is mounted on the chassis frame 2 of the vehicle 1 and is driven forward and backward along the chassis frame 2 by an appropriate drive device.
A split-type loading platform 3 is mounted on the rear end of the loading platform 4, and includes a second loading platform 5 which is vertically pivotally connected by a connecting pin 6. Both the first loading platform 4 and the second loading platform 5 are located on the chassis frame 2, and the loading platform 3 is located on the chassis frame 2.
In the retracted position, the second loading platform 5 is installed in an inclined state between the rear end of the chassis frame 2 and the floor surface, and the second loading platform 5 Appropriate engaging elements 18 are protruded from appropriate positions of the chassis frame 2.
The rear end portion 2b includes a grounding leg 11 which is pivotally supported in the vertical direction by a fulcrum pin 13, and which interacts with the engaging element 18 of the second loading platform 5 when the loading platform 3 moves forward and backward. When the loading platform 3 moves forward, the grounding leg 12 is rotated upward and stored on the chassis frame 2 side, while when the loading platform 3 moves backward, the grounding leg 12 is moved toward the chassis frame 2 side. A freight vehicle with a movable loading platform is provided with an appropriate grounding leg rotation operating member 15 that operates to swing downward from the ground and touch the ground on a floor surface.