JPS6229262B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a canopy opening/closing device used for a cargo box of a dump truck, particularly a cargo box that can be discharged to the side.

The conventional canopy opening/closing device was already put into operation in 168416.
As shown in Fig. 1, a lift arm 02 and a swing arm 03 are rotatably supported on a cargo box 01,
A seat frame 05 for attaching a seat 04 is pivotally supported at the tips of the seats 2 and 03, and by rotating the lift arm 02, the seat frame 05 is moved from the solid line position to the dashed-dotted line position to move the upper part of the cargo box 01. It's starting to open up.

However, if the device described above is used in a cargo box that can be discharged from the side, when the seat frame is in the position indicated by the dashed-dotted line, the center of rotation of the lift arm and the pivot point between the swing arm and the seat frame are Since the lift arm and the seat frame are separated, the lift arm and the seat frame become rigid bodies, and there is a disadvantage that the side sliding door cannot be opened because it is obstructed by the lift arm and the seat frame.

The present invention eliminates the above-mentioned drawbacks, and examples thereof will be described below with reference to the drawings.

Reference numeral 1 denotes a dump truck loading box, and the loading box 1 has fixed columns 2 at four corners of the front, rear, left, and right, and a front wall 3 is fixed between the fixed columns 2 and 2 in the front.

Among the fixed columns 2..., the rear fixed columns 2, 2
A rear sliding door 4 is provided between them, and side sliding doors 5, 5 are provided between the front and rear fixed pillars 2, 2, and each sliding door 4, 5, 5 is connected to each fixed pillar 2... by a hinge provided above. Bracket 6...
It is pivotally supported by... and supported so as to be openable downward, and the lower ends of the sliding doors 4, 5, 5 are secured by a securing device 7, which is released from securing when the cargo box 1 is tilted. Next, the canopy opening/closing device 8 will be described. A front support plate 9 is provided above the space between the front fixed columns 2, and a rear support plate 10 is provided above the space between the rear fixed columns 2.

Brackets 11, 11 are erected approximately at the center of both the support plates 9, 10, and the brackets 11, 1
1, the bases of lift arms 12, 12 are pivotally supported so as to be rotatable laterally.

Further, swing arms 13, 1 are mounted on the fixing columns 2, 2 on one side of the cargo box 1, that is, on the fixing columns 2, 2 on the lower side in FIG.
The swing arms 13, 13 have first regulating pieces 14, 14 and second regulating pieces 1 fixed on the fixed columns 2, 2 and on the side surfaces thereof.
At points 5 and 15, swinging beyond the range between the solid line position and the one-dot chain line position in FIG. 4 is restricted.

16, 16 is a sheet frame, and this sheet frame 16,
16, one end of the lift arm side seat frames 16a, 16a and one end of the swing arm side seat frames 16b, 16b are rotatably supported, and the other end of the lift arm side seat frames 16a, 16a is attached to the lift arm 1.
2, 12, the swing arm side seat frame 16
The other ends of b and 16b are pivotally supported by the tips of the swing arms 13 and 13, respectively. Said seat frame 1
Stopper pins 17, 17 are installed at the bent portions of 6 and 16.
is provided to restrict the downward opening of the bending portion from exceeding a predetermined opening. A plurality of reinforcing rods 18 extending in the longitudinal direction of the loading box 1 are provided between the sheet frames 16, 16 provided at the front and rear of the loading box 1 in order to integrate and reinforce both the sheet frames 16, 16. Moreover, a sheet 19 covering the upper part of the cargo box 1 is stretched between the sheet frames 16 and 16 with a string 20.

Reference numeral 21 denotes an electric motor that is a driving means for the lift arm 12. The electric motor 21 is provided approximately at the center of the front support plate 9, and a reduction gear 22 for decelerating the rotation of the electric motor 21 is adjacent to the electric motor 21. 2
The rod 23 extending from the lift arm 12
The lift arm 12 is fixed to the base and can be rotated laterally by operating the electric motor 21.

24, 24 are the front support plate 9 and the rear support plate 10
With the stopper piece fixed on the top, the stopper piece 2
4, 24, when the seat 19 is stored on the side of the cargo box 1, a part of the lift arms 12, 12 comes into contact with the stopper pieces 24, 24, and the lift arms 12, 12
It is designed to regulate the rotation of the

To explain the operation of the present invention with the above-mentioned configuration, first, when loading earth and sand etc. into a cargo box, the fourth
When the electric motor 21 is activated and the lift arms 12, 12 are rotated clockwise from the state shown by the solid line in the figure,
Since the seat frames 16, 16 are pushed to the right, the swing arms 13, 13 are moved to the dashed line position, that is, the second position.
It swings to a position where it comes into contact with the regulating pieces 15, 15.

When the lift arms 12, 12 are further rotated,
The downward opening degree of the bent portions of the seat frames 16, 16 gradually decreases as they pass through position A indicated by the dashed dotted line,
Lift arms 12, 12 are stopper pieces 24, 24
Rotate to position B, indicated by the two-dot chain line, where it comes into contact with .

Thereafter, the seat frames 16, 16 rotate to position C indicated by the three-dot chain line due to their own weight, but the rotation locus X of the seat frames 16a, 16a on the lift arm side from position B and the swing arm side from position B. Seat frame 16
Since the rotation trajectories Y of the swing arms 13 and 16b are different, the swing arms 13 and 13 rotate counterclockwise, and the rotation trajectories Y of the swing arm side seat frames 16b and 16b change to the lift arm side seat frames 16a and 16b, respectively. 16a, the swing arms 13, 13 rotate until they come into contact with the first regulating pieces 14, 14, and reach position C indicated by the three-dot chain line.

At this time, since the sheet frames 16, 16 are folded in half and stored on the side of the cargo box 1, the sheet 19 is also folded in half and stored, and the upper part of the cargo box 1 is opened.

In this state, earth and sand are loaded into the cargo box 1 using a shovel truck or the like.

When the loading of earth and sand, etc. is completed, the electric motor 21 is activated and the lift arms 12, 12 are rotated counterclockwise, so that the seat frames 16, 16 are moved from the position C indicated by the three-dot chain line to the position indicated by the solid line, A sheet 19 covers the upper part of the cargo box 1 to prevent earth and sand from scattering during driving. that time,
Since the stopper pins 17, 17 restrict the downward opening of the bent portions of the seat frames 16, 16, the seat frames 16, 16 can maintain the state shown by the solid line in FIG. Next, when discharging earth and sand, etc. to the sides of the cargo box at a predetermined location, the electric motor 21 is operated in the same way as when loading earth and sand, etc. into the cargo box 1, and the lift arms 12, 12 are moved clockwise. The seat 19 is rotated and stored on the side of the cargo box 1 as shown by the three-dot chain line in FIG.

After that, when the cargo box 1 is tilted as shown in Fig. 5, the lashing device 7... is released, and the side sliding door 5 opens downward under its own weight, and the earth and sand inside the cargo box 1 is released from the side. It is discharged.

At that time, the seat frames 16, 16 also move to the fourth position due to their own weight.
The lift arm side seat frame 16 rotates from position C in the figure to the solid line position in Figure 5.
Since the rotation locus X of a, 16a is different from the rotation locus Z of the swing arm side seat frames 16b, 16b from position C, the swing arms 13, 13 rotate clockwise, and the swing arms 13, 13 rotate clockwise. Side seat frames 16b, 16b
The rotation locus Z of the lift arm side seat frame 16a,
16a, it reaches the solid line position in FIG. 5 and does not interfere with the downward opening of the side sliding door 5.

As described above, in the present invention, a lift arm and a swing arm are pivotally supported on a cargo box, a bendable seat frame is pivotally supported on the lift arm and the swing arm, and a seat is stretched between the seat frames. However, by rotating the lift arm, the seat can be stored on the side of the cargo box, so even when the seat is stored on the side of the cargo box, the seat frame can swing under its own weight.
There is no obstruction to the downward opening of the side fan door.

[Brief explanation of the drawing]

Fig. 1 is a conventional example, Fig. 2 is a top view of the present invention, Fig. 3 is a side view, Fig. 4 is a sectional view taken along line A-A in Fig. 2, and Fig. 5 is an operating state diagram of Fig. 4. . 1 is a packing box, 2 is a fixed column, 8 is a canopy opening/closing device, 1
2 is a lift arm, 13 is a swing arm, 16 is a seat frame, and 19 is a seat.

Claims (1)

[Claims] 1. In a dump truck loading box which has fixed pillars at the four corners of the front, rear, left and right, and in which the side fan door is supported by the fixed pillars so that it can be opened downward, the spaces between the front fixed pillars and the rear fixed pillars are erect a support plate for each,
The base of the lift arm is pivotally supported approximately in the center of each of the support plates so as to be able to rotate laterally, while a regulating piece is placed on one side of the fixed column to restrict the swing within a predetermined swing range. The base of a swinging arm is pivotally supported in a swingable manner, and the end of a bendable seat frame is pivotally supported at the tip of each arm, and between the front and rear of the seat frame, a reinforcing rod is attached to the upper surface of the cargo box. 1. A canopy opening/closing device for a dump truck cargo box, characterized in that a sheet is provided to cover the cargo box, and the seat can be stored on the side of the cargo box by appropriately rotating the lift arm using a drive means.