JPH0740778A - Tail gate closing device for separation type load carrying platform for load handling vehicle - Google Patents

Abstract

PURPOSE:To obviate a power source for opening/closing a tail gate by connecting the tip end section of a cylinder supporting a tail gate, the lower end section of an arm rotatably installed onto the upper end section of the tail gate and the upper end section of a lever the intermediate section of which is rotatably installed onto the lower section of a load carrying platform to one another via a rotating pivot. CONSTITUTION:A tail gate 1 is rotatably pivoted onto the rear section of the bottom plate 11a of a load carrying platform 11 by a rotating pivot 6, and the middle section of a lever 3 is rotatably pivoted onto the lower section of the load carrying platform 11 by a rotating pivot 9. A body contact section 3a is provided for one end section of the lever 3, when the load carrying plat form 11 is tilted around the rotating pivot of the load carrying platform at the body side, the body contact section 3a is slid downward within a groove in the rear end surface of a body so as to allow the lever 3 to be rotated around the rotating pivot 9. One end section of an arm 2 is rotatably installed onto the other end section of the lever 3, a pivot 7 installed at the middle section of the tail gate 1 is inserted into the slot of the arm 2 in such a way as to be freely slid, one end section of a cylinder 4 is installed onto a rotating shaft 10 at the lower section of the load carrying platform 11, and the other section of the cylinder 4 is then installed onto a connecting rotating pivot 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tailgate opening / closing device for a separation type cargo bed for a cargo handling vehicle, such as a rear dump truck.

[0002]

[Prior art]

(1) In the conventional tailgate opening / closing device for an integrated cargo bed for cargo handling vehicles, one end of the tailgate is pivotally supported at the rear of the cargo bottom plate via the opening / closing shaft, and the middle portion of the rotary lever is pivotally supported at the rear of the chassis. Supportingly, one end of the rotary lever and an intermediate part of the tailgate are connected by a power transmission arm, and a lifting mechanism of the loading platform by a hoist cylinder is linked by a link mechanism composed of the rotary lever and the power transmission arm. The tailgate is automatically communicated with the tailgate through the above-mentioned manner. (2) In a conventional tailgate opening / closing device for a separate cargo bed for cargo handling vehicles, the opening / closing axis of the tailgate is attached to the top of the cargo bed, and the lifting motion of the cargo bed by the hoist cylinder is transmitted to the tailgate via a link mechanism. The tailgate is designed to open and close automatically.

[0003]

The tailgate opening / closing device for the separate type loading platform for cargo handling vehicles of the above (2) is different from the tailgate opening / closing device for the integrated loading platform for cargo handling vehicles of (1) above. Power source for opening and closing the tailgate (motor,
It is necessary to provide a cylinder or the like), resulting in high cost and high maintenance cost.

Further, every time the loading platform is mounted on and separated from the vehicle body, the power source circuit for opening / closing the tailgate between the vehicle body and the loading platform must be connected / disconnected, and this coupling / separation work is very complicated. become. In addition, when the tailgate is of the openable and closable type, the top of the mountain formed by the unloading load may be cut by the tailgate, which requires a large storage area.

Further, since the tailgate is located above, there is a problem in that, when the load is dropped, in the case of a bulky load, the tailgate collides with the tailgate. The present invention is proposed in view of the above problems, and the object thereof is to eliminate the need for a power source for opening and closing a tailgate, and reduce costs and maintenance costs. In addition, work for connecting and disconnecting the power source circuit for opening and closing the tailgate can be eliminated and workability can be improved. In addition, the area of the storage space can be minimized because the upper part of the mountain formed by the unloading load is not cut by the tailgate. Further, it is another object of the present invention to provide a tailgate opening / closing device for a separated cargo bed for a cargo handling vehicle, which can easily carry out loading and unloading when there is no load hitting the loaded goods.

[0006]

In order to achieve the above-mentioned object, a tailgate opening / closing device for a separated cargo bed for a cargo handling vehicle according to the present invention has a lower end portion of the tailgate rotatably attached to a rear portion of a bottom plate of the cargo bed, Attach the cylinder supporting the tailgate to the lower part of the loading platform together with the accumulator, rotatably attach the upper end of the arm to the upper part of the tailgate, and rotatably attach the middle part of the lever to the lower part of the loading platform. The lower end of the lever and the upper end of the lever are connected via a rotation support shaft.

[0007]

The tailgate opening / closing device for the separated cargo bed for a cargo handling vehicle according to the present invention is configured as described above, and is used when the cargo bed is separated from the vehicle body and when the cargo bed is lowered in the on-vehicle state. Also, the tailgate is supported by the accumulator in a standing state at a certain angle and the rear part of the loading platform is closed to prevent the load from falling. Also, when tilting the loading platform upwards for unloading the load, the lower end of the lever contacts the rear end surface of the vehicle body, then slides downward, the lever is rotated, and the arm is pulled forward to pull the tailgate. Pull down to flatten the tailgate against the bottom plate of the carrier, open the rear of the carrier and drop the load.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a tailgate opening / closing device for a separate type cargo bed for a cargo handling vehicle according to the present invention will be described with reference to an embodiment shown in FIGS. 1 to 3, 13 in FIG. 2 and FIG. , A boat-bottom one-sided loading platform mounted so as to be capable of tilting upward about a vehicle-body-side loading platform rotation support shaft 12, and a loading platform tilting cylinder 14 interposed between a front portion of a vehicle body 13 and a lower front portion of the loading platform 11. Is.

1 to 3 is a tailgate, and the tailgate 1 is pivotally supported by a rotary shaft 6 on the rear portion of the bottom plate 11a of the cargo bed 11. An intermediate portion of the lever 3 is pivotally supported on the lower portion of the loading platform 11 by a rotary support shaft 9. A vehicle body contact portion 3a is provided at one end of the lever 3, and when the platform 11 tilts clockwise (upward) about the vehicle body side carrier rotation support shaft by a predetermined angle, the vehicle body contact portion of the lever 3 is provided. 3a contacts the rear end surface of the vehicle body 13, and then the vehicle body contact portion 3a slides downward in a groove provided on the rear end surface of the vehicle body 13 so that the lever 3 rotates counterclockwise about the rotation support shaft 9 (see FIG. 3 in the direction of arrow B).

One end of the arm 2 is rotatably attached to the other end of the lever 3 via a connecting rotary support shaft 8. Reference numeral 7 denotes a support shaft attached to the middle portion of the tailgate 1, and the support shaft 7 is slidably fitted in a long hole provided at the other end of the arm 2. Reference numeral 10 denotes a rotary support shaft provided in the lower part of the loading platform 11. One end of a cylinder 4 is attached to the rotary support shaft 10, and the other end of the cylinder 4 is attached to the connecting rotary support shaft 8. An accumulator 5 is attached to the outer surface of the luggage carrier 11. The accumulator 5 keeps the mounting angle of the tailgate 1 when the luggage carrier 11 is horizontal via the cylinder 4 at a constant angle.

The tailgate 1, the arm 2 and the lever 3
The link mechanism composed of the cylinder 4, the accumulator 5, and the accumulator 5 is basically provided on each of the left and right sides of the luggage carrier 11, but among these devices, the cylinder 4 and the accumulator 5 can be increased or decreased as necessary. is there. Next, the operation of the tailgate opening / closing device for the separate type cargo bed for cargo handling vehicles shown in FIGS. 1 to 3 will be specifically described.

FIG. 1 shows a state in which the loading platform 11 is separated from the vehicle body 13 and stands on its own, and FIG. 2 shows a state in which the loading platform 11 is lowered while being mounted on the vehicle. In these states, the cylinder 4 operates in the extending direction, the tailgate 1 is pushed up by the arm 2, and the rear part of the cargo bed 11 is closed by the tailgate 1 to prevent the load from falling.

In order to unload the cargo from the state shown in FIG. 2, the bed tilting cylinder 14 is actuated in the extension direction to tilt the bed 11 clockwise (upward) about the vehicle body-side bed rotation support shaft 12. FIG. 3 shows a tilted state of the loading platform 11.
At the initial stage of this tilting, the vehicle body contact portion 3a of the lever 3 moves to the vehicle body 13
Touch the rear end face of the. Since the tilting of the loading platform 11 further continues in the above direction, the vehicle body contact portion 3a then slides downward in the groove provided on the rear end surface of the vehicle body 13, and the lever 3 rotates counterclockwise about the rotation support shaft 9. (See arrow B), the arm 2 is pulled forward through the connecting rotary support shaft 8 and the tailgate 1 is pulled downward through the support shaft 7,
The tailgate 1 rotates about the rotation support shaft 6 in the direction of arrow A in FIG. 3, and the rear end of the luggage carrier 11 is opened.

At the time of opening, the tailgate 1 is mounted on the cargo bed 11
It comes into contact with the rib 11b of the tailgate stopper provided at the rear end and becomes flat with respect to the bottom plate 11a of the luggage carrier 11. The long hole of the arm 2 into which the support shaft 7 is slidably inserted is
Although it has a role of absorbing the deviation of the link mechanisms 1 to 5, it also has a role of preventing the arm 2 from pulling too much from the opened state of the tailgate 1.

At the time of tilting, the cylinder 4 is compressed because the connecting rotary support shaft 8 moves toward the front of the vehicle body due to the rotation of the lever 3. An accumulator 5 is attached to absorb this pressure. This accumulator 5
Also serves to return the parts to their original positions until the loading platform 11 descends.

[0016]

As described above, the tailgate opening / closing device for the separated cargo bed for the cargo handling vehicle according to the present invention uses the cylinder and the accumulator when the cargo bed is separated from the vehicle body and when the cargo bed is lowered in the on-vehicle state. The tailgate is supported in a standing state at a certain angle, and the rear part of the loading platform is closed to prevent the load from falling. Also, when tilting the loading platform upwards for unloading the load, the lower end of the lever contacts the rear end surface of the vehicle body, then slides downward, the lever is rotated, and the arm is pulled forward to pull the tailgate. Pull down to flatten the tailgate against the bottom plate of the loading platform, open the rear of the loading platform, and drop the load.Therefore, the power source for opening and closing the tailgate can be eliminated, and the tailgate opening / closing device can be used In addition to the fact that it can be configured by a simple link mechanism consisting of an arm, a lever, a cylinder, and an accumulator, the cost and maintenance cost can be reduced.

Further, the work of connecting and disconnecting the power source circuit for opening and closing the tailgate can be eliminated and the workability can be improved. In addition, the area of the storage space can be minimized because the upper part of the mountain formed by the unloading load is not cut by the tailgate. Further, when the load is dropped, there is nothing that hits the load, and thus unloading can be easily performed.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a cargo bed is separated from a vehicle body in an embodiment of a tailgate opening / closing device for a separation type cargo bed for a cargo handling vehicle according to the present invention.

FIG. 2 is a side view showing a state in which the luggage carrier is being lowered while being mounted on the tailgate opening / closing device.

FIG. 3 is a side view showing a state in which the luggage carrier is tilted in the tailgate opening / closing device.

[Explanation of symbols]

 1 Tailgate 2 Arm 3 Lever 3a Body contact part of lever 4 Cylinder 5 Accumulator 6 Rotation support shaft 7 Support shaft 8 Connection rotation support shaft 9 Rotation support shaft 10 Rotation support shaft 11 Load carrier 11a Bottom plate of load carrier 11 Vehicle side load carrier rotation Spindle 13 Body 14 Cylinder for tilting platform

Claims (1)

[Claims] 1. A lower end portion of a tailgate is rotatably attached to a rear portion of a bottom plate of a loading platform, a cylinder for supporting the tailgate is attached to a lower portion of the loading platform together with an accumulator, and an upper end portion of an arm is rotatably attached to an upper portion of the tailgate. A separate loading platform for a cargo handling vehicle, characterized in that an intermediate portion of a lever is rotatably attached to a lower portion of a loading platform, and a tip end of a cylinder, a lower end of an arm, and an upper end of a lever are connected to each other via a rotation support shaft. Tailgate opening and closing device.