JPS5943335B2 - Dump truck lever operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lever operation for a dump truck that eliminates erroneous operation by associating a regulating member between at least a pair of operating levers, and that enables reliable operation of an operated part connected to an operating lever. It is related to the device.

For example, in a lever operation device for a side dump truck or a three-turn dump truck, one operation lever first engages and disengages a plurality of hinge sections, and then the other operation lever engages and disengages the hinge section selected by the operation. Tilts the cargo box.

However, in the dump truck, if the cargo box is lifted with the hinge portion incompletely engaged and disengaged, a serious problem arises in that the hinge portion comes off and the cargo box falls.

The present invention provides a lever operating device for a dump truck that solves the above-mentioned problems, and embodiments thereof will be described below with reference to the drawings.

In Fig. 1, 1 is the car frame, 2 is a cargo box mounted on the car frame 1, 3, 3... are provided at the front and rear four corners between the car frame 1 and the cargo box 2, respectively. A plurality of hinge portions are shown which are detachably connected between the hinge portions.

Reference numeral 4 denotes a hydraulic cylinder that is interposed approximately in the center between the vehicle frame 1 and the cargo box 2 and can dump the cargo box 2 either rearward or sideways around a suitably selected hinge.

The hinge parts 3, 3, .
A lower hinge 7 protrudes from the end of the support member 5 horizontally installed above and forms an engagement recess 6, and a lower hinge 7 is fixed to the lower surface of the loading box 2 facing the lower hinge 7 and is fitted into the engagement recess 6. The upper hinge 9 has a hinge pin 8 attached thereto, and a locking pawl 11 is pivotally supported on the lower hinge 7 by a shaft 10 and engages with the hinge pin 8 of the hinge 9 described above.

Next, FIG. 3 shows a lever operating device for engaging and disengaging the hinge parts 3, 3, . Referring to FIGS. 6 to 6, reference numeral 12 denotes a mounting bracket installed in the driver's cab 13. A shaft 14 is installed on both sides of the bracket 12, and a pair of hinge operation levers 15 are mounted on the shaft 14. Short pipe 16 with 15' fixed
, 16' and a short tube 18 to which a cargo box lifting/lowering operation lever 17 is fixed are rotatably supported.

On the front surface of one of the rotary tubes 16, 16', each hinge part 3.3...
Operating pieces 20, 20' connected to the locking claws 11, 11, . A stopper 22.22' with which one end abuts is fixed, and an abutment surface 23°23' is formed at the tip of the stopper 22.22'.

On the other hand, on the front surface of the other rotary tube 18, there is an operating piece 25 connected to a cargo box lifting valve via a push-pull wire 24.
It is fixed so that it can be swung back and forth.

Note that 26, 26' and 27 are guide holes bored in parallel to the top surface of the mounting bracket 12, and these guide holes 26, 26'
, 27, the hinge operating lever 15, 15' and the cargo box lifting/lowering operating lever 17 swing back and forth.

The regulating member 21 includes a shaft 29 which is rotatably mounted on an L-shaped support piece 28 attached to the rear surface of the mounting bracket 12, an arm 30 fixed to one end of the shaft 29, and a shaft 29 that passes through the tip of the arm 30 on the left and right sides. The engagement pin 31 is attached to the other end of the shaft 29, and the engagement arm 32 has an abbreviated shape attached to the other end of the shaft 29.

The engagement pin 31 is connected to the hinge operation lever 15 , 1
5' is switched to the front-rear intermediate position of the guide hole 26, 26', that is, when the engagement between the hinge pin 8 and the engagement claw 11 constituting the hinge portion 3 is incomplete, the sixth
As shown in the figure, the abutting surfaces 2 at the ends of the stoppers 22 and 22'
3, 23', and the engagement portion 3 at the tip of the engagement arm 32
2' engages with the cargo box lifting/lowering operation lever 17 which has been switched to the lowered position, and suppresses the swinging of the cargo box lifting/lowering operating lever 17 from the lower position to the upper position.

Furthermore, the hinge operation levers 15 and 15' are connected to the guide holes 26.
, 26', when the hinge part 3 is completely engaged and disengaged, the engagement pin 3
1 can be rotated to the solid line position in FIG. 4 where it engages the side surfaces of the stoppers 22, 22'.

At this time, the tip of the engagement arm 32 is rotated to the rear position, so that the cargo box lifting/lowering operation lever 17 can freely swing back and forth.

Note that when the retaining pin 31 and the side surfaces of the stoppers 22 and 22' are engaged, the hinge operation/bar
15, 15t switching operation is suppressed.

The present invention has the above configuration. First, the hinge operation levers 15 and 15' are operated back and forth as appropriate, and the desired hinge portion 3,
Perform the engagement/disengagement in step 3.

Next, when the cargo box lifting operation lever 17 is switched from the lower position to the upper position, the cargo box 2 can be dumped in a desired direction.

By the way, during the above operation, the hinge operation lever 1
5, 15' cannot be switched to the correct position, and the guide hole 26
, 26', that is, when the position is switched to the solid line position in FIG. will be located at the front.

In the above state, if an attempt is made to switch the operating lever 17 for lifting the cargo box from the lowered position at the front to the raised position at the rear, the operating lever 17 for lifting the cargo box engages with the engagement arm 32 and the rearward movement is prevented. As a result, the cargo box lifting/lowering operation lever 17 is not switched to the raised position, and as a result, it is difficult to notice that the hinge parts 3, 3, . . . are not fully engaged or disengaged. can.

Therefore, if the hinge operating levers 15 and 15' are operated firmly, the stopper 22 or 22' will move back and forth as indicated by the dashed line or the dashed double dot line in FIG. can be moved to the position indicated by the two-dot chain line in FIG. 6, and in this case, the cargo box lifting/lowering operation lever 1γ can be switched from the lower position to the upper position.

Furthermore, when the cargo box lifting operation lever 17 is switched to the upper position, that is, when the cargo box 2 is raised, the fourth
As shown by the solid line in the figure, the engagement pin 31 connects to the stopper 22,
22', the operating lever 17
Therefore, the problem of removing the hinge parts 3, 3 when lifting the cargo box does not occur.

In the embodiment, the weight of the engagement pin 31 is increased to apply rotational force to the regulating member 21 in the direction of disengaging the engagement pin 31 from the stoppers 22, 22'. You may.

Furthermore, although the engagement and disengagement operations of the hinge parts 3, 3, .

Furthermore, each operating lever 15, 15', 17 has a short tube 1 at its base.
6, 16', and 18, each operating lever 15
．． The bases of 15' and 17 are pivotally supported so as to be able to swing left and right, and lock grooves are drilled in the front and rear ends of guide holes 26 and 26' and 27 that guide each operating lever, so that each operating lever can be locked when switching of the operating lever is completed. If the lock groove is engaged with the lock groove, the switching operation can be performed more safely and reliably.

As described above, the present invention relates the hinge operating lever and the cargo box lifting/lowering operating lever to an engagement pin and an engagement arm that rotate back and forth, so that unless the hinge operating lever is switched to the correct position, Since the operating lever for raising and lowering the cargo box cannot be switched, the problem that the hinge section comes off when the cargo box is lifted can be completely eliminated.

[Brief explanation of the drawing]

Fig. 1 is a rear view of the dump truck, Fig. 2 is a partial view showing the hinge part, Fig. 3 is a perspective view showing the lever device of the present invention, Fig. 4 is a side sectional view of Fig. 3, and Fig. 5 is a partial view showing the hinge part. Rear sectional view in Figure 3;
FIG. 6 is a partially enlarged view of FIG. 4. 3 is a hinge portion, 12 is a mounting bracket, 14 is a shaft, 15 is a hinge operating lever, 17 is a cargo box lifting/lowering operating lever, and 22 is a stopper.

Claims (1)

[Claims] 1. A hinge operating lever and a cargo box lifting operating lever are pivotally supported by a shaft installed on the mounting bracket so as to be able to swing back and forth, and the hinge portion can be engaged and disengaged by swinging the respective operating levers back and forth. In a lever operation device for a dump truck, which operates to raise and lower a load box, an engagement pin that can abut against a stopper attached to the hinge operation lever is provided at an appropriate position on the mounting bracket, and a load lever integrated with the engagement pin is provided at an appropriate position on the mounting bracket. An engagement arm that can be engaged with a box lifting/lowering operation lever is rotatably supported, and when the stopper and the engagement pin collide, the hinge operation lever is positioned such that the hinge portion cannot be engaged or disengaged. At this time, the engaging arm and the operating lever for lifting the cargo box can be engaged with each other while switching the operating lever for lifting the cargo box from the lower position to the upper position. Device.