JP2727057B2 - Rear door opening and closing device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle rear door opening and closing device. Vehicles include general trucks as well as dump trucks.

[0002]

2. Description of the Related Art Conventionally, as a rear door opening / closing device for a vehicle,
There is an embodiment proposed by the applicant and described in Japanese Patent Application Laid-Open No. Hei 6-72357. As shown in FIGS. 11 and 12, this embodiment basically includes a rear door 3 having an inner wall surface formed in an arc shape 3a, and a pair of drive cylinders 5 provided on left and right side walls 4 of a carrier, respectively. The rear ends are pivotally supported by the side walls 4 each formed in a U-shape, and
A pair of left and right connecting links 8 whose inner ends are pivotally supported by the operating rod 10 of the drive cylinder 5 and whose outer ends are fixed to the left and right side walls 3b of the rear door, respectively. Taper 12 cut and formed at the lower part of inner wall surface 11
And a taper 1b cut into the floor surface 1a corresponding to the arcuate surface 3a of the rear door 3.

Now, this embodiment will be described in more detail. Reference numeral 1 denotes a loading platform of a dump truck 2,
The rear end of the floor surface 1a is formed in a taper 1b.

[0004] Reference numeral 3 denotes a rear door that closes a rear opening of the cargo bed. The inner wall surface of the rear door 3 is formed in an arc shape 3a.

[0005] Reference numeral 5 denotes a pair of drive cylinders provided respectively on the left and right side walls 4 and 4 of the carrier, and these drive cylinders 5 and 5 have bearing members 7 in recesses 6 formed in the side walls 4 and 4 of the carrier. Is pivoted through.

A rear end 4a of the arm 8a is pivotally supported on each of the side walls 4, 4 having a U-shaped end face via a pivot pin 9, and an inner end of the arm 8a is connected to the rear end 4a. Left and right sides of the right and left side walls 3b, 3b of the rear door 3 are fixed to the right and left side walls 3b, 3b of the rear door 3 by being pivotally supported by the operating rods 10, 10 of the respective drive cylinders 5, 5. It is a pair of connecting links. The connecting link 8 is slightly bent in the angular direction about the pivot pin 9 as a fulcrum.

[0007] The rear end portions 4a of the side walls 4, 4;
The lower part of the inner wall 11 of the rear door 4a is cut to correspond to the arcuate surface 3a of the rear door 3 like the taper 1b of the floor surface, and has a taper 12. Reference numeral 13 denotes a bogie or a frame of the vehicle 2.

The operation of the above configuration will be described.
When the operating rod 10 of the drive cylinder 5 is contracted as shown by 1, the rear door 3 closes the rear opening of the carrier.

Therefore, as shown in FIG. 12, when the drive cylinders 5, 5 are driven and the left and right operating rods 10 are extended, the respective drive cylinders 5 are slightly rotated in the counterclockwise hand direction, while the respective connecting links 8 are It starts rotating in the hour hand direction with the pivot pin 9 as a fulcrum. At this time, the arc-shaped surface 3a of the rear door 3 is
The rear ends 4a, 4a are in sliding contact with the taper 12.

When the operating rods 10 of the left and right drive cylinders 5 are extended, the rear door 3 is stored horizontally below the floor 1a of the carrier 1 via the connecting links 8. As a result, the back of the loading platform 1 is opened.

However, in the above configuration, the rear door 3 can be opened and closed at any time, regardless of the inclination of the carrier 1, and it is necessary for the driver or the like to open the rear door when unloading the cargo. However, there are advantages such as improvement in the work of discharging the load, and the ability to travel while the rear door 3 is stored in a horizontal state under the floor surface 1a of the loading platform 1. There is a drawback that, because the inner wall surface is directly pressed against the arcuate inner wall surface of the rear door, earth and sand adhere to the inner wall surface after the discharging operation, or the lower portion of the inner wall surface 3a of the rear door 3 is damaged depending on a load.

[0012]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the prior art, the present invention is intended to remove as much as possible the earth and sand on the inner wall surface of the rear door after the work of discharging the load and remove the load as much as possible. Or that the lower part of the inner wall surface of the rear door is not damaged even when stones or the like are loaded, and that a gap generated between the rear door and the end of the floor surface of the cargo bed can be eliminated. It is an object of the present invention to obtain a rear door opening / closing device for a vehicle, which has an advantage that it is not necessary to cut the floor end of the vehicle significantly.

[0013]

A vehicle rear door opening and closing device according to the present invention comprises a rear door 3A and left and right side walls 4A of a loading platform.
, And a pair of drive cylinders 5 respectively provided at both ends thereof, and rear end portions thereof are pivotally supported by the side walls 4A each formed in a U-shape in an end surface, and an inner end portion is provided with an operating rod 1 of the drive cylinder 5.
0, while the outer ends are left and right side walls 3 of the rear door.
b, a pair of left and right connecting links 8 respectively fixed to each other, a taper 12 cut and formed at a lower portion of an inner wall surface 11 at a rear end of the both side walls, and a floor surface 1a against an inner wall surface 3a of the rear door 3A. A rear door opening / closing device for a vehicle, comprising a taper 1b cut to form the rear door 3A at the rear end of the floor surface 1a when the rear door 3A is closed.
The free end 21 abuts against the inner wall surface of the rear door 3A, while the rear door 3A
Is stored below the floor 1a.
Plate 2 on which the free end 21 is supported on the upper edge 19 of
It is characterized in that 0 is pivoted.

Further, the vehicle rear door opening and closing device of the present invention comprises:
A rear door 3B whose inner wall surface has a slightly U-shaped or arc-shaped section 3a, a pair of drive cylinders 5 provided on each of the left and right side walls 4B of the cargo bed, and a rear end portion formed in a U-shape end surface. Pivotally supported by the side walls 4B, respectively;
A rear door opening / closing device for a vehicle includes an inner end pivotally supported by an operating rod 10 of the drive cylinder 5 and an outer end fixed to a pair of left and right side walls 3b of the rear door 3B. At the rear end of the floor 1a,
When the rear door 3B is closed, the free end 21B abuts on the inner wall surface of the rear door 3B. On the other hand, when the rear door 3B is stored below the floor surface 1a, the free end 21B contacts the upper edge 19B of the rear door 3B. The end plate 21B is pivotally attached to a rotating plate 20B that is abutted or supported.

[0015]

The turning plate rotates following the opening and closing of the rear door.
However, when the rear door rotates from the vertical state in which the rear door is closed to the horizontal direction in which the rear door is housed under the floor, the free end of the rotating plate slides on the inner wall surface of the rear door, and the free end of the rear door at the free end. Removes mud and other deposits on the inner wall. On the other hand, when the rear door is rotated from the state where it is stored under the floor of the cargo bed in a direction to close the rear opening of the cargo bed, the free end of the rotating plate eventually slides on the inner wall surface of the rear door while sliding. Stand up at an angle.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In describing the embodiment of the present invention, the same parts as those in the above-described conventional embodiment are denoted by the same reference numerals for convenience.
A duplicate description will be omitted.

First, in the first embodiment shown in FIGS. 1 to 5, the main difference from the conventional embodiment is that the rear door 3
A that the inner wall surface 3a of A is not formed in an arc shape,
And the rear door 3A is provided at the rear end of the floor surface 1a.
When the rear door 3A is closed, the free end 21 abuts on the inner wall surface 3a of the rear door 3A. On the other hand, when the rear door 3A is stored below the floor 1a, the free end 21 is attached to the upper end edge 19 of the rear door 3A. This is a point that the rotating plate 20 on which the portion 21 is supported is pivotally connected via a plurality of hinges 22.

In the above construction, when the operating rod 10 of the drive cylinder 5 is contracted as shown in FIG. 2, the rear door 3A closes the rear opening of the carrier 1A, and the rotating plate 20
Free end 21 of the rear door 3A
Is in contact with the inner wall surface 3a.

On the other hand, when the operating rod 10 of the drive cylinder 5 is extended as shown in FIG.
Rotates in the direction of the hour hand around the fulcrum.
A is stored horizontally below the floor 1a of the loading platform 1A via the connecting link 8, and the rear of the loading platform is opened. At this time, the free end 21 of the rotating plate 20 abuts or is supported by the upper edge 19 of the rear door 3A and faces obliquely downward.

Therefore, the rotating plate 20 rotates following the opening and closing of the rear door 3A. However, when the rear door 3A rotates from the closed vertical state to the horizontal direction in which the rear door 3A is housed under the floor surface 1a, the free end 21 of the rotating plate 20 slides on the inner wall surface 3 of the rear door 3A. The free end 21 scrapes off any deposits such as mud adhering to the inner wall surface 3 of the rear door 3A.

On the other hand, the rear door 3A is connected to the floor 1a of the bed 1A.
When rotating in a direction to close the rear opening of the loading platform 1A from the state of being stored below, the free end 21 of the rotating plate 20
Finally rises in an oblique state while sliding on the inner wall surface 3 of the rear door 3A.

Next, the second embodiment shown in FIGS. 6 to 10 is mainly different from the above-mentioned conventional embodiment in that the cross section of the inner wall surface 3a of the rear door 3B is slightly "C" -shaped or arcuate.
In the present embodiment, the point is formed in the shape of a little "ku",
The end of the floor 1a of the bed 1B is slightly cut or formed at the end of the floor 1a of the bed 1B, or the end of the floor 1a of the bed 1B is cut from the beginning. When the rear door 3B is closed, the free end 21B contacts the inner wall surface 3a of the rear door 3B when the rear door 3B is closed. When it is stored below the floor 1a, the free end 21B is attached to the upper edge 19B of the rear door 3B.
Is that the rotating plate 20B to be contacted or supported is pivotally connected via a plurality of hinges 22B.

In the case of the second embodiment, when the rear door 3B is stored below the floor 1a, depending on the length (length) of the side wall 4B or the rear door 3B of the carrier 1B, the rotating plate 20B Of the rear door 3B hangs vertically behind the upper edge 19B of the rear door 3B, and therefore the free end 21B does not abut or be supported by the upper edge 19B of the rear door 3B.

[0024]

As is apparent from the above description, the present invention has the following effects. (1) After the load is discharged, the rear door can be removed as cleanly as possible without depositing earth and sand on the inner wall surface of the rear door. (2) Even if stones or the like are loaded, the lower part of the inner wall surface of the rear door is not damaged. (3) The gap generated between the rear door and the end of the floor of the cargo bed can be eliminated. (4) In the case of the second embodiment, it is not necessary to remarkably cut the floor end of the heavy load carrier. (5) The drive cylinder can be easily mounted on the carrier. (6) It is unnecessary for the driver or the like to open the rear door when unloading the load, or to stop the rear door after opening the load so that the rear door does not open. Therefore, work efficiency is improved. (7) Since the number of parts is small in manufacturing, it can be manufactured at low cost. (8) In the case of the embodiment in which the cross section of the inner wall surface of the rear door is formed in a slightly “U” shape or arc shape, the rear door opens and closes smoothly.

[Brief description of the drawings]

1 to 5 are schematic explanatory views showing a first embodiment of the present invention. 6 to 10 are schematic explanatory views showing a second embodiment of the present invention. 11 and 12 are explanatory views showing one embodiment of the related art.

FIG. 1 is a partially cutaway perspective view of a first embodiment.

FIG. 2 is an explanatory diagram of a state in which a rear door is closed.

FIG. 3 is an explanatory diagram of an intermediate state in which a rear door is rotating.

FIG. 4 is an explanatory diagram of a state where a rear door is rotated.

FIG. 5 is an explanatory view of a main part from a perspective view.

FIG. 6 is a perspective view of a partially cut-away view of the second embodiment.

FIG. 7 is an explanatory diagram of a state where a rear door is closed.

FIG. 8 is an explanatory view of a halfway state in which the rear door is rotating.

FIG. 9 is an explanatory diagram of a state where a rear door is rotated.

FIG. 10 is an explanatory diagram of a state where a rear door is rotated.

FIG. 11 is an explanatory diagram of a state where a rear door is closed.

FIG. 12 is an explanatory view of a halfway state in which the rear door is rotating.

[Explanation of symbols]

 1, 1A, 1B: loading bed, 3, 3A, 3B ... rear door, 3a ... inner wall surface, 4, 4A, 4B ... side wall (of the loading bed), 5 ... drive cylinder, 7 ... bearing member, 8 ... connecting link, 10 ... Actuating rod, 1b ... taper (of floor surface), 12 ... taper, 19, 19B ... top edge (of rear door), 20, 20B ... turning plate, 21, 21B ... free end (of turning plate).

Claims (3)

(57) [Claims] 1. A rear door 3A and left and right side walls 4A of a carrier.
, And a pair of drive cylinders 5 respectively provided at both ends thereof, and rear end portions thereof are pivotally supported by the side walls 4A each formed in a U-shape in an end surface, and an inner end portion is provided with an operating rod 1 of the drive cylinder 5.
0, while the outer ends are left and right side walls 3 of the rear door.
b, a pair of left and right connecting links 8 respectively fixed to each other, a taper 12 cut and formed at a lower portion of an inner wall surface 11 at a rear end of the both side walls, and a floor surface 1a against an inner wall surface 3a of the rear door 3A. A rear door opening / closing device for a vehicle, comprising a taper 1b cut to form the rear door 3A at the rear end of the floor surface 1a when the rear door 3A is closed.
The free end 21 abuts on the inner wall surface 3a of the rear door 3A, while the rear end 3A of the turning plate is supported by the upper edge 19 of the rear door 3A when the rear door 3A is stored below the floor 1a. 20. A rear door opening / closing device for a vehicle, wherein 20 is pivotally mounted. 2. The cross section of the inner wall surface is slightly U-shaped or arc-shaped.
a, the left and right side walls 4B of the loading platform
And a pair of drive cylinders 5 respectively provided at the rear end thereof, and a rear end portion pivotally supported by each of the side walls 4B formed in a U-shape in an end surface, and an inner end portion of the operating rod 1 of the drive cylinder 5.
0, a pair of left and right connecting links 8 pivotally supported at the outer end of the rear door 3B and fixed to the left and right side walls 3b of the rear door 3B.
When the rear door 3B is closed, the free end 21B abuts on the inner wall surface of the rear door 3B. On the other hand, when the rear door 3B is stored below the floor 1a, the rear door 3B is closed. A pivoting plate 20B on which the free end portion 21B abuts or is supported is pivotally attached to the upper end edge 19B of the vehicle. 3. The free end 21B of the pivoting plate 20B hangs vertically behind the upper edge 19B of the rear door 3B when the rear door 3B is stored below the floor 1a. A rear door opening / closing device for a vehicle, comprising: