JPS5926494B2 - dump truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables the loading and unloading of the hinge part from inside the driver's cab to dump the cargo box into two rolls on both sides, or three rolls on both sides and rear. This invention relates to a dump truck whose sliding door can be automatically opened and closed in conjunction with the lifting and lowering of the dump truck.

Below, an example of a side dump truck will be explained with reference to the drawings. In Fig. 1, 1 is a vehicle frame (subframe), 2 is
3゜3', 3', 3' denote a cargo box mounted on the vehicle frame 1, and 3゜3', 3', 3' indicate a pair of removable hinges provided on each left and right between the vehicle frame 1 and the cargo box 2. The cargo box 2 can be dumped in one direction or the other direction.

Since the hinge parts 3, 3', 3', and 3' are all the same, the structure of one hinge part 3 will be explained with reference to FIGS. 2 and 3. A lower hinge body 6 is formed with an engagement recess 5 opening upward at the side end, and a hinge pin 7 is fixed to the bottom of the packing box 2 in correspondence with the lower hinge body 6 and engages with the engagement recess 5. The upper hinge body 8 is pivotably supported by the lower hinge body 6, and is engaged with the hinge pin 7 of the upper hinge body 8 to switch the hinge part 3 between a locked state and a detachable state. The locking claw 9 is connected to an operating rod 10 that can be controlled from the driver's cab.

Next, the automatic fan door opening/closing device will be explained with reference to FIGS. 4 and 5. A pair of left and right torque shirts N1 and 12 extending in the front and back direction are rotatably supported at the bottom of the cargo box 2, and one torque shaft 110 Each end has a swinging piece 13
, 13' are vertically installed, and each of these swing pieces 13, 13'
is provided on one side, and locking pins 15, 1 at the bottom of the sliding door 14
It is connected via rods 17 and 17' to a pair of front and rear hooks 16 and 16' that engage with the sliding door 5' and close the sliding door 14.

Similarly to the above, respective swing pieces 18 and 18' are vertically provided at both ends of the other torque shaft 78120, and these respective swing pieces 18 and 18' are provided on the other side and are connected to the fan door 19 as before.
Rods 22, 2 are attached to a pair of front and rear hooks 21, 21' that engage with the locking pins 20, 20' to close the sliding door 19.
It is connected via 2'.

As shown in FIGS. 2 to 5, a pair of swing shafts 2 are provided on both sides of the bottom of the cargo box 2 adjacent to the rear hinge portions 3, 3.
3 and 23', and one swing shaft 23 has an actuation arm 25 that swings while being guided by a guide roller 24, which will be described later.
A connecting arm 28 connected to an actuating piece 26 fixed to the torque shaft 12 via a rod 27 is pivotably supported, and the swinging of the actuating arm 25 is caused by the connecting arm 28, the rod 27, the actuating piece 26, and the torque. The actuating arm 2 is connected via the shaft 12, the swinging piece 18°18', and the rods 22, 22'.
The signal is transmitted to a pair of front and rear hooks 21 and 21' on the opposite side of the hook 5, and the hooks 21 and 21' can be swung.

The other swing shaft 23' includes an operating arm 25' that swings while being guided by a guide roller 24', which will be described later, and a connecting arm that is connected to an operating piece 26' fixed to the torque shaft 12 via a rod 27'. 28' is pivotably supported, and the swinging of the operating arm 25' is controlled by the connecting arm 28' and the rod 27.
', operating piece 26', torque shaft 11, swinging piece 13
, 13' and rods 17, 17' to a pair of front and rear hooks 16, 16' on the opposite side of the actuating arm 25', thereby making it possible to swing the hooks 16, 16'.

On the other hand, L-shaped support brackets) 29, 29' are fixed to both ends of the lower hinge bodies 6', 6 or the support tube 40, and the loading box 2 is in a lowered state at the tip of the support brackets) 29, 29'. When the upper hinges 8', 8's hinge pins 7', 7
The guide rollers 24, 24' described above are provided which are rotatable with their centers aligned with the guide rollers 24, 24'.

In addition, 30, 30' are left and right hooks 2L21' and 16
, a spring energized toward the side that releases the engagement of 16';
Reference numerals 31 and 31' indicate spring cylinders interposed between the rods 27 and 27'.

Next, to explain the operation, first, the hinge part 3' on one side
, 3' are the engaging claws 9', 9' that constitute the hinge pins? ',
? ' and then remove the hinge parts 3, 3' on the other side.
When the engaging claws 9 and 9' constituting the
As shown in the figure, the cargo box 2 can be dumped to the right around the hinge parts 3, 3'.

By the way, during the dump operation, the operating arm 25 of the right hinge section 3 remains engaged with the guide roller 24 whose center is aligned with the hinge pin 7, so that the hook 21, 21' on the rising side It is held in a fixed position, and the fan door 19 can be held in a closed state.

On the other hand, the operating arm 25' of the left hinge portion 3' rotates clockwise in FIG. Moving pieces 13, 13' and rod 17
, 17' to the pair of front and rear hooks 16, 16', and the hooks 16, 16' are rotated counterclockwise to open the sliding door 14.

Therefore, at the same time as the loading box 2 is tilted, the swing door 14 on the hinge center side
Since the cargo box 2 will be opened, the loaded items in the cargo box 2 will be discharged to the side.

Furthermore, when the rising cargo box 2 is lowered, the operating arm 25' on the left side in FIG. 4 first brings its inclined lower surface into contact with the guide roller 24', and then descends along the guide roller 24'. The actuating arm 25' is rotated in the counterclockwise direction opposite to that described above, thereby causing the hooks 16, 16' to rotate.
is rotated clockwise to bring the fan door 14 into a closed state when the cargo box 2 is in a lowered state.

Furthermore, when dumping is performed on the opposite side to that shown in FIG.
.

By switching 9" and 9" in the opposite direction, the left side fan door 19 can be automatically opened while the right side fan door 14 is closed, as described above.

As described above, the present invention provides a lower hinge body having an engagement recess formed therein on the vehicle frame side, an upper hinge body to which a hinge pin that is engaged with the engagement recess is fixed on the cargo box side, and further restrains the rise of the hinge pin. Since the hinge part is constructed by providing locking pawls on the vehicle frame side, the hinge part can be engaged and disengaged from inside the driver's cabin, while the guide can be freely rotated by aligning it with the center of the hinge pin when lowering the cargo box. A roller is provided on the vehicle frame side, and an operating arm connected via a rod to a hook that closes the sliding door is swingably supported on the cargo box side and is brought into contact with the guide roller to form the sliding door. Since the automatic opening/closing device is configured, the dumping direction can be easily controlled from the driver's cab with a simple structure, and the loaded object can be reliably discharged to the desired side.

[Brief explanation of the drawing]

Figure 1 is a rear view of the dump truck, Figure 2 is a front view of the hinge, Figure 3 is a side view of the hinge, Figure 4 is a sectional view showing the automatic door opening/closing device, and Figure 5 is the door. It is a perspective view of an automatic opening and closing device.゛In the figure, 1 is a car frame, 2 is a cargo box, 3 is a hinge part, 5 is an engaging recess, 6 is a lower hinge body, 7 is a hinge pin, 8 is an upper hinge body, 9 is a locking claw, 16゜21 is a 24 is a guide roller, 25 is an operating arm, and 28 is a connecting arm.

Claims (1)

[Claims] 1. A lower hinge body provided on the vehicle frame side and forming an engagement recess, an upper hinge body provided on the cargo box side and fixed with a hinge pin that fits into the engagement recess of the lower hinge body, and an upper hinge body provided on the vehicle frame side. A plurality of hinge parts each having a locking pawl that can be locked to the hinge pin and the locking operation can be performed from inside the driver's cab are provided, and when the hinge is engaged, the center of the hinge pin forming the hinge part Guide rollers that are rotatable in unison are attached to the vehicle frame side, and an operating arm that swings while being guided by the guide rollers is pivotally supported on the bottom of the cargo box near the hinge portion, and the actuating arm is pivoted to be guided by the guide roller and is related to the movement of the operating arm. A dump truck is made up of a connecting arm that swings and is connected via a rod to a hook that closes the door.