JPH0428272Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a lifting device that is attached to the rear or side of a vehicle body such as a freight vehicle and facilitates the loading and unloading of cargo by raising and lowering the platform. In particular, the present invention relates to a lifting device having a structure suitable for folding a platform and storing it under the floor of a vehicle body.

(Prior Art and Problems) Conventionally, as a lifting device installed on a truck, it has been common to use the rear gate of the truck as a platform, and use a link mechanism to raise and lower the platform that also serves as the rear gate.

By the way, if the body of a freight vehicle does not have a gate, but has a double door, a sliding door, an accordion door, a fully-opening side roof, etc., it is rather inconvenient if the platform also serves as the gate of the vehicle body.

(Means for Solving the Problems) In view of the above points, the present invention attempts to provide a lifting device whose platform can be folded and stored under the floor of a vehicle body, and which can be attached to vehicle bodies having various structures. It is something.

The present invention includes a fixed support member fixed to the rear or side part of a vehicle body, a rotating shaft rotatably supported by the fixed supporting member, a cylinder for driving the rotating shaft, and both sides of the rotating shaft. a rotating member fixed to the rotating member, a stopper bolt attached to the rotating member, and one end of which is pivotably attached to the rotating member and rotates integrally with the rotating member in contact with the stopper bolt in the upward direction. a movable main arm, a sub-arm which together with the main arm forms a parallel link for elevating and whose one end is pivoted to the fixed support member side, the other end of the main arm at the upper end, and the sub-arm at the lower end. a vertical link whose other ends are pivotally connected, and a main platform which is pivotally connected to the upper end of the vertical link together with the main arm and abuts the vertical link to maintain a horizontal state;
A sub-platform is foldably connected to the main platform via a hinge, and when not in use, the sub-platform is folded over the main platform to form the vehicle body. The structure is suitable for storage under the floor.
The problems of the conventional technology are solved.

(Function) In the lifting device of the present invention, the platform has a connecting structure of the main platform and the sub-platform, and the sub-platform is folded onto the main platform to form a parallel link mechanism consisting of the main arm and the sub-arm. By folding it down and then lifting it up using a parallel link mechanism, it can be stored under the floor of the vehicle body so as not to interfere with the movement of vehicles such as freight cars. If it is not stored under the floor, measures such as locking it upside down can be adopted.

During cargo handling, the main platform and sub-platform are extended into a flat plate shape and are raised and lowered while maintaining a horizontal state using the parallel link mechanism.

(Example) Hereinafter, an example of the elevating device according to the present invention will be described with reference to the drawings.

In FIGS. 1 to 7, the lifting device is attached to the rear or side of the vehicle body 1 of a freight vehicle, and as shown in FIG. 2, a round pipe 3 that is fixed to the vehicle chassis 2 and serves as a bearing A fixed support member 4 having a fixed support member 4, a rotary shaft 5 that passes through the round pipe 3 of the fixed support member 4 and is rotatably supported, a hydraulic cylinder 6 that drives the rotary shaft 5, and a hydraulic cylinder 6 for driving the rotary shaft 5. It includes a rotating member 7 fixed to both sides, and a main arm 8 and a sub-arm 9 forming a parallel link mechanism for lifting and lowering.

As can be seen from FIGS. 2 and 3, the main body side of the hydraulic cylinder 6 is pivotally connected to a cylinder arm 10 fixed to the rotating shaft 5 with a pin 11. Further, a lower round pipe 13 is fixed in parallel to the fixed round pipe 3 via a connecting plate 12, and a pin 15 is attached to a bracket 14 fixed to the lower round pipe 13.
The tip of the piston rod of the cylinder 6 is pivotally connected through the piston rod. Therefore, when the piston rod of the cylinder 6 extends, the cylinder arm 10 rotates counterclockwise in FIG. 3 and the like. That is, the rotating shaft 5 rotates to the left in FIG. 3 and the like.

One end of the main arm 8 is pivotally connected to the rotating member 7 with a pin 20, and the main arm 8 is connected to the rotating member 7 by a stopper bolt 21 screwed onto the bottom of the rotating member 7, as shown in FIGS. 3 and 4. The positional relationship between the rotary member 7 and the rotating member 7 can be adjusted. When the rotating member 7 attempts to rotate counterclockwise due to the left rotation of the rotating shaft 5, the stopper bolt 21 comes into contact with the main arm 8, and the main arm 8 rotates together with the rotating member 7. Raise the tip.

As shown in FIGS. 1, 2 and 6, one end of the sub-arm 9, which forms a parallel link for lifting with the main arm 8, is pinned to a bracket 25 fixed to the round pipe 3 of the fixed support member 4. It is pivoted at 26.

The other ends, ie, the tips, of the main arm 8 and the sub-arm 9 are pivotally connected to a vertical link body 30, respectively.

Here, as shown in FIGS. 2 and 7, the vertical link body 30 is a combination of a main arm side link section 30A and a sub arm side link section 30B, and the upper ends of both link sections 30A and 30B are
1 to the rear brackets 33A to 33C of the main platform 40.

At this time, the tip of the main arm 8 is pivotally attached to the upper end of the main arm side link portion 30A, and a balance spring 34 is provided around the pin 31 between the brackets 33C and 33D. Here, the balance spring 34 is a torsion spring that biases the main platform 40 in the direction of standing up (however, it is not strong enough to actually make it stand up; Subplatform 4 connected to this
This is to reduce the operating force required when folding and standing up 1 and 2. ).

Further, the tip of the sub-arm 9 is pivotally attached to the lower end of the sub-arm side link portion 30B with a pin 35,
The pin 35 is further connected to the main arm side link portion 30A.
It passes through the lower end of and is pivotally attached to it. Therefore, both link parts 30A and 30B move together.

An upper plate 4 of the main platform 40 whose rear end abuts against the vertical link body 30 to maintain a horizontal state.
3, there are brackets 33A to 3 as shown in FIG.
The notch portion 44 is formed for a section of 3C.
This notch 44 is provided with the upper plate 43 when the main platform 40 is folded and stored toward the main arm 8 side.
This is to ensure that this does not become an obstacle.

On the other hand, the main arm side link part 30A and the sub arm side link part 30 that constitute the vertical link body 30
The upper surface of B is an upper plate portion 45 which coincides with the upper plate 43 of the main platform 40 when it is horizontal.

A sub-platform 41 is foldably connected to the main platform 40 via a double hinge 42, as shown in FIGS. 3 and 4.
As shown in the figure, contact blocks 46 and 47 are fixed to the lower portions of both platforms 40 and 41, respectively, so that they form a single horizontal plate when extended.

In addition, there is a 7th platform between both platforms 40 and 41.
A torsion bar 48 is arranged as shown. That is, the bent ends of the torsion bars 48 are provided along the back side of the upper plate of each platform, and are fixed by torsion bar holders 49, respectively. This torsion bar 48 generates a torsion force that biases the sub-platform 41 in the direction of standing up with respect to the main platform 40 (however, it is not strong enough to actually stand up the sub-platform 41; is subplatform 4
This is to reduce the operating force when standing up the device. ).

Next, the operation of the lifting device shown in the embodiment will be explained.

In the lifting and lowering operation from the height at which the main platform 40 and sub-platform 41 are aligned with the floor surface of the vehicle body 1 in FIG. 3 until the lower end of the vertical link body 30 in FIG. Rotation center P, pivot point Q at the tip of main arm 8, pivot point R at the tip of sub-arm 9, and rotation center S of sub-arm 9 form a parallelogram, and side QR should be placed on the vertical line. For example, by extending or retracting the hydraulic cylinder 6, the main platform 40 and sub-platform 41 are raised or lowered while maintaining a horizontal state.

Further, from the state shown in FIG. 4, the hydraulic cylinder 6
If the rotation member 7 is retracted, the rotation member 7 rotates clockwise, but the main arm 8 cannot rotate together with the rotation member 7, and as shown in FIG. The main arm 8 rises from the stopper bolt 21 on the side, and the side PQ becomes longer. As a result, the vertical link body 30 tilts and the tip of the sub-platform 41 lands on the ground.

Therefore, in the state shown in Fig. 5, cargo can be loaded and unloaded onto both platforms 40, 41 using a trolley etc. very easily, and the cargo on the platform can be unloaded onto the floor of the car body using both platforms 40 and 41 as shown in Fig. 4. After the platforms 40, 41 are leveled, the raised state of FIG. 3 is carried out.

To store the main platform 40 and sub-platform 41, first fold the sub-platform 41 onto the main platform 40 side with the main arm 8 and sub-arm 9 lowered as shown in Figures 1 and 2. , by leaning against the storage guide 50 fixed to the fixed side round pipe 3, and then extending the cylinder 6 to lift the tips of the main arm 8 and the sub-arm 9 as shown in FIG. This allows each platform 4
0 and 41 are stored under the floor of the vehicle body 1 so as not to get in the way.

(Effects of the invention) As explained above, according to the elevating device of the invention, there is a fixed support member fixed to the rear or side part of the vehicle body, and a rotating shaft rotatably supported by the fixed support member. and a cylinder that drives the rotating shaft.
a rotating member fixed to both sides of the rotating shaft; a main arm having one end pivoted to the rotating member and rotating integrally with the rotating member in the upward direction; and a main arm for lifting and lowering together with the main arm. a sub-arm forming a parallel link, one end of which is pivotally connected to the fixed support member side, and the other end of the main arm at the upper end,
a vertical link to the lower end of which the other end of the sub-arm is pivotally connected; a main platform that is pivotally connected to the upper end of the vertical link together with the main arm and abuts against the vertical link to maintain a horizontal state; Since the structure includes a sub-platform that is foldably connected to the main platform via a hinge, the sub-platform can be folded over the main platform when not in use, and the vehicle body can be attached to the main platform. The structure may be suitable for storage under the floor. As a result, there is an advantage that it can be attached to various vehicle body structures that do not have gates. In addition, the main arm is not directly connected to the rotation axis, but is pivoted to the rotation member, and in the upward direction, it rotates together with the rotation member by contacting the stopper bolt attached to the rotation member. This prevents the main arm from interlocking with the movement of the rotating member after the vertical link body lands on the ground during the downward movement.
As a result, the tip of the sub-platform can be reliably landed on the ground, making it possible to facilitate the loading and unloading of carts and the like. Further, by adjusting the amount of protrusion of the stopper bolt, the rotation range of the main arm can be adjusted, and variations in the mounting conditions of the lifting device to the vehicle can be absorbed. Further, there is an advantage that a special mechanism such as a hydraulic cylinder is not required for storing the platform, and the structure is simple.

[Brief explanation of drawings]

Figure 1 is a side view of the lifting device according to the present invention, with the main platform and sub-platform folded up and leaning against each other, Figure 2 is a front view of the same, and Figure 3 is the main platform. Figure 4 is a side view when the platform and subplatform are in the raised position; Figure 4 is a side view when the platform and subplatform are in the lowered position;
The figure shows a side view of the sub-platform when its tip is on the ground, Figure 6 is a side view of the main platform and sub-platform folded and stored, and Figure 7 shows the main platform and sub-platform. FIG. 3 is an exploded perspective view showing a mechanism accompanying the boot home. DESCRIPTION OF SYMBOLS 1... Vehicle body, 3... Round pipe, 4... Fixed support member, 5... Rotating shaft, 6... Hydraulic cylinder, 7...
...Rotating member, 8...Main arm, 9...Sub arm, 10...Cylinder arm, 30...Vertical link body, 40...Main platform, 41
...Subplatform, 42...Hinge, 48...
...Torsion bar.

Claims (1)

[Scope of utility model registration request] A fixed support member fixed to the rear or side part of the vehicle body, a rotating shaft 5 rotatably supported by the fixed supporting member, and a cylinder 6 that drives the rotating shaft 5.
and a rotating member 7 fixed to both sides of the rotating shaft 5.
and a stopper bolt 21 attached to the rotating member 7, one end of which is pivotally connected to the rotating member 7, contacts the stopper bolt 21 in the upward direction, and rotates together with the rotating member 7. A main arm 8, a sub-arm 9 which together with the main arm 8 forms a parallel link for lifting and whose one end is pivoted to the fixed support member side, the other end of the main arm 8 at the upper end and the sub-arm 9 at the lower end thereof. a vertical link body 30 to which the other ends of the sub-arms 9 are pivotally attached, and a main body that is pivotally attached to the upper end of the vertical link body 30 together with the main arm 8 and abuts against the vertical link body 30 to maintain a horizontal state. platform 40
and a sub-platform 41 which is foldably connected to the main platform 40 via a hinge.