JPS5930575B2 - Car loading platform lowering device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile cargo platform lowering device that can lower a cargo platform by a certain amount during cargo handling operations.

In general, it is well known from experience that loading and unloading cargo is much easier if the height of the loading platform is low to some extent.However, in the past, the diameter of the rear tires was reduced. There has only been a proposal for a freight vehicle in which the overall height of the vehicle is lowered by doing so.

However, with the method of reducing the diameter of the rear tires, the lowest ground height cannot be sufficiently lowered due to the relationship with the tire load, and when securing the tire load with double tires, There is a problem in that the wheel drive mechanism etc. become complicated and the cost increases.

It is also known to tilt the loading platform in the direction of loading and unloading (for example, Utility Model Application No. 48-97824), but with this method, it is difficult to lower the minimum ground clearance of the loading platform. Not only that, but there is also the problem that the luggage moves and is easily damaged.

The present invention has been made to solve such problems, and during cargo handling work, bump clearance between the bottom surface of the cargo platform and the rear wheels (a clearance set to ensure the fluctuation of the rear wheels during driving) is provided. ) is unnecessary, and the object of the present invention is to provide a vehicle loading platform lowering device with a simple structure that can lower the loading platform rearward within the range of bump clearance during cargo handling work.

Therefore, in the present invention, the loading platform is connected to the chassis using a plurality of link rods, and a first position is provided in which a bump clearance is maintained between the lower surface of the loading platform and the wheels;
An actuator is provided on the chassis to swing directly or indirectly to a second position rearward and downward from the first position, and the link rod is normally held in an upright position to move the cargo platform to the first position.
The cargo platform is held at the second position during cargo handling operations.

The present invention will be specifically described below with reference to the illustrated embodiments.

In FIG. 1, 1 is a chassis frame that supports a rear wheel 2, 3 is a loading platform supported on a loading platform frame 4, and 5.・・・
, 5 is a link rod that connects the chassis frame 1 and the loading platform frame 4 at the side; 6 is a link rod whose base end is pivotally connected to the chassis frame 1 and the tip is pivotally connected to the loading platform frame 4;
This is an actuator consisting of a double-acting hydraulic cylinder or the like that swings the carrier in the front-rear direction, and these actuators constitute the lowering device for the loading platform 3 as a whole.

That is, during normal driving, etc., as shown in Figure 1,
The actuator 6 is operated to extend, and the link rod 5.・
5 can be held in an upright position to ensure the necessary bump clearance C between the bottom surface of the loading platform and the rear wheel 2, and during cargo handling work, the actuator 6 can be retracted as shown in Fig. 2. By actuating the link rod5.・・・
, 5 is swung rearward, and the loading platform frame 4 supporting the loading platform 3 is placed on the chassis frame 1, so that the entire loading platform 3 can be lowered by 770 minutes of the bump clearer.

Note that in the normal running state shown in Fig. 1, the actuator 6
can be maintained by hydraulically locking the operating state of the chassis frame 1. As shown in FIG. It is preferable that the lock be mechanically locked by engaging with lock pins 9, 9' provided using the lock pins 9, 9'.

Further, the actuator 6 may be not only a hydraulic cylinder device but also a winch type for winding a rope or chain or a manual type other known means.

In this embodiment, when the loading platform 3 is lowered, the loading platform frame 4 can be placed directly on the chassis frame 1.
Cargo handling work can be carried out stably.

Also, when running on a small vehicle, link rod 5. ..., 5
In order to hold the link rod 5. in an almost vertical position,・・・
・.

Only the vertical force acts on the link rod 5.5, and the moment during acceleration and deceleration of the vehicle does not act on the link rod 5.5, and the lateral force due to lateral acceleration can also be reduced. ...
, 5 and locking devices 8, 92, 8'.

This can have a positive effect on the durability of 9'.

The embodiment μ shown in FIGS. 4 and 5 focuses on the strength of the loading platform 3.

In the present invention, by lowering the cargo platform frame 4 to a position where it touches the rear wheels 2, the floor can be made as low as possible, but by loading the cargo, suspension springs (not shown) can be used.

) begins to flex, the rear wheels 2 will directly receive part of the load of the loading platform 3.

Therefore, as the carrying load increases, the concentrated load that the loading platform 3 receives from the rear wheels 2 increases.

As a countermeasure for this, it is possible to provide a reinforcing material to distribute the load on the bottom of the loading platform 3, or to provide a gap between the loading platform frame 4 and the rear wheel 2 by the amount of deflection of the suspension spring when descending. In this case, the amount of descent of the loading platform 3 is reduced and the effect is halved.

Therefore, in this embodiment, the fifth
As shown in the figure, downwardly protruding legs 10°10 are provided,
As shown in FIG. 4, when the loading platform 3 is lowered, it is brought into contact with the bearing portion 11a provided on the axle shaft 11 of the rear wheel 2, and the load of the loading platform 3 is applied directly to the axle shaft 11.
It is preferable to prevent relative displacement between the carrier frame 4 and the rear wheel 2.

In this case, the length of the legs 10 is set so that when the loading platform is lowered, the loading platform 3 and the rear wheels 2 come into contact with each other or maintain a slight gap.

In any case, in this embodiment, the force exerted on the loading platform 3 by the reaction force of the rear wheels 2 can be blocked or kept below a certain level.

Another embodiment shown in FIGS. 6 to 8 is a link rod 5. . . , 5 focuses on the strength.

That is, as in the present invention, the loading platform 3 is lowered by the link mechanism,
In the case where the link rod 5. is raised, the load acts directly on the link rod 5. ..., 5
It is necessary to increase the strength of the hinge itself and the hinge part.

In this embodiment, when the loading platform 3 is raised (during travel), the loading load of the loading platform 3 is increased by the link rod 5. . . , so as not to act directly on the chassis frame 1, and as shown in FIGS. , the carrier frame 4 is provided with support legs 14 corresponding to the side support bases 13, and as shown in FIG. 6, when the carrier is raised, link rods 5. ...,
5, the front part of the carrier frame 4 is placed on the front support stand 12, and the side support legs 14 are placed on the side support stand 13. In this state, the link rod 5. . . , 5 is slightly rotated forward from the vertical position, and the loading load of the loading platform 3 is directly applied to the chassis frame 1 via the supports 12, 13.

Further, as shown in FIG. 7, when lowering the loading platform 3, the link rod 5. . . , the loading platform 3 is slightly lifted when the loading platform 5 rotates to the vertical position, so the front and side support legs 14 of the loading platform frame 4 are moved rearward while being lifted relative to the supporting platform 12.13. As a result of being moved, support stand 1
2.13, it is lowered to a position where it rests on the chassis frame 1 without being disturbed.

As shown in FIG. 9, recesses 12'a and 13'a having slight recesses are provided on the sides of the support bases 12' and 13', while the front part of the load frame 4 and the support legs 14' are provided with recesses 12'a and 13'a. - When rising, the recesses 12'a of the support stands 12', 13',
Providing the convex portions 15 and 16 that fit into the convex portions 13'a not only makes it easy to position the loading platform 3, but also prevents or restrains the loading platform 3 from moving in the front-rear direction or left-right direction.

The relationship between the concave and convex portions may be reversed, and the shape of the concave and convex portions may be selected from any shape such as a tapered surface, a spherical surface, or a conical shape.

As is clear from the above description of various embodiments, the vehicle loading platform lowering device according to the present invention connects the loading platform and the chassis with a plurality of link rods, and connects the loading platform between the bottom surface of the loading platform and the wheels. 1st to maintain bump clearance
By making it possible to swing the cargo platform from the first position to a second position rearward and downward, and by providing an actuator for swinging the cargo platform and holding the link rod upright, the cargo platform can be moved to the first position when the vehicle is running. While the cargo platform is held in this position to ensure bump clearance between the cargo platform and the rear wheels, during cargo handling operations, the cargo platform is lowered to a second position at the rear within the range of the bump clearance.

According to the present invention, since the loading platform is positioned at the rear and swings downward, it becomes very easy to load and unload cargo during cargo handling operations, and the tire diameter can be made larger than that of cars with small diameter tires. Therefore, it is extremely advantageous in terms of tire load.

Since unnecessary bump clearance is used during cargo handling operations, there is no need to modify any parts of the chassis (suspension springs, etc.), and this also improves reliability as the vertical movement of the cargo platform is not strained. Moreover, it is possible to obtain various advantages such as extremely simple operation and no risk of erroneous operation, and it is possible to provide an automobile loading platform lowering device that has a simple structure and is inexpensive.

[Brief explanation of drawings]

Figures 1 and 2 are side views of an automobile showing an embodiment of the present invention. Figure 1 shows the loading platform when it is raised, Figure 2 shows the loading platform when it is lowered, and Figure 3 shows the loading platform's locking mechanism. FIG. 4 is an explanatory side view of an automobile showing another embodiment of the present invention, FIG. 5 is a perspective view of the cargo platform shown in FIG. 4 as seen from the bottom side, and FIGS. 6 and 7 8 is a side view of a main part of a car showing the lifting and lowering stages of the cargo platform in another embodiment of the present invention, FIG. 8 is a cross-sectional view taken along the line A-A in FIG. 6, and FIG. and FIG. 8 is a side view of a main part of an automobile showing a modification of the embodiment shown in FIG. 7. 1... Chassis frame, total... Loading platform, 4... Loading platform frame, 5. ..., 5... link rod, 6...
・Actuator, C...bump clearance.

Claims (1)

[Claims] 1 A first position in which a chassis supporting the wheels and a loading platform placed on the chassis are connected by a plurality of link rods, and a bump clearance is maintained between the bottom surface of the loading platform and the wheels; An actuator for swinging the cargo bed directly or via a link is provided on the chassis at a second position at the rear and below, and when the vehicle is running, the link rod is held in an upright position and the cargo bed is moved to the first position for cargo handling operations. A vehicle loading platform lowering device in which the link rod is sometimes rotated to hold the loading platform in a second position.