JPH0751983Y2 - Dump truck tailgate opening and closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tailgate opening / closing device for a dump truck equipped with a bet cell that is tilted around a rear pin on a rear frame of a vehicle body.

(Prior Art) Referring to FIG. 6, a conventional example of the tailgate opening / closing device will be described. It is tilted by a dump cylinder (not shown) around a rear pin (d) on a rear frame (a) at the rear of the vehicle body. In a dump truck provided with a bet cell (b) with a tailgate (c), a guide plate (e) erected on a rear frame (a) and a roller pivotally attached to the lower side of the bet cell (b). (G) a lever (f), a gate hook (h) pivotally attached (m) to the rear lower side of the bet cell (b), and an opening side lower end of a tailgate (c) provided at the rear of the bet cell (b). A pin (i) provided, an interlocking rod (j) connected between the gate hook (h) and the lever (f),
A tailgate opening / closing device including a spring (k) connected between the interlocking rod (j) and the bet cell (b) is provided,
When the bet cell (b) is in the horizontal position shown by the solid line, the lever (f) is guided by the guide plate (e), the gate hook (h) is rotated rightward in the figure through the interlocking rod (j), and the lower end of the tail gate (c) is moved. When the tailgate (c) is closed by locking the pin (i) of the part and the bet cell (b) is tilted upward like a chain line, the guide plate (e)
The roller (g) of the lever (f) is disengaged from the door, and the gate hook (h) is rotated counterclockwise in the figure by the spring bias of the spring (k), the pin (i) is released, and the tailgate (c) is released. It can be opened.

There is also proposed a device in which the lever (f) is actuated by a solenoid valve (not shown) to operate the gate hook (h) via the interlocking rod (j).

(Problems to be Solved by the Invention) In the conventional tailgate opening / closing device, the device shown in FIG. 6 has a mechanism in which Betzels are directly pivotally mounted on a rear frame and mounted on the rear frame. In the mechanism for mounting the bet cell via the sub-frame, it is necessary to form a play between the sub-frame and the bet cell, which reduces the operation reliability of the lever with the roller by the guide plate, that is, the reliability of opening and closing the tailgate. However, there is a problem that the vehicle may run with the gate open or the dump operation may be performed with the gate closed.

Further, the device for operating the gate hook by the solenoid valve requires the number of operation steps and may be erroneously operated, and thus has the same problem.

The present invention was developed to address the above-mentioned problems, and its purpose is to apply to a mechanism in which a subframe with Beth cells is mounted on the rear frame and to open / close the gate. It is to provide a dump truck tailgate opening / closing device with improved performance and reliability.

(Means for Solving the Problem) The present invention provides a vessel-mounted subframe that tilts around a rear pin on a rear frame at the rear of a vehicle body,
A fixed lock pin that is inserted into the subframe together with the vehicle body under the vessel placed on the ground and engages with a long hole in the vehicle body traveling direction provided on the vessel, and is disposed on the lower rear side of the vessel. A sub-frame that is parallel to the vehicle body of the sub-frame and does not interfere with the gate hook that faces the gate hook that locks the lower end of the tailgate of the vessel by rotating with a spring bias. And a cam plate that engages with the gate hook by the upward tilt and rotates to the gate release side against the bias of the spring, and is disposed on the lower rear side of the bet cell. The gate hook is controlled by a cam plate provided on the rear portion of the subframe and operated by a dump operation, so that the opening / closing control of the gate hook is surely performed without being influenced by the play between the subframe and the bet cell.

(Function) By providing a subframe that tilts around the rear pin on the rear frame and mounting the bet cells on the sub frame, it is a bet cell separated type, mounting the bet cell of various sizes without loading waiting time, It enables transportation and obtains excellent cargo handling efficiency, and when the bezel cell is tilted upward together with the subframe around the rear pin, the cam plate provided at the rear part of the subframe is actuated and the gate hook is resisted against the spring bias. And rotate to the gate opening side,
The tailgate is automatically opened properly in response to the tilting of the bet cell, and when the bet cell is horizontally rotated together with the subframe, the cam plate becomes inoperable correspondingly and the gate hook is rotated by the spring bias to open and close the tail gate. The gate is automatically closed by locking the side lower end, and even if there is play between the subframe and the bezel, it is not affected and the cam plate operates properly at a position close to the gate hook.

(Embodiment) FIGS. 1 to 5 show an embodiment of the present invention, in which (1) is a front vehicle body having front wheels (3a), (2) is a front vehicle body (1) with a vehicle body bending Rear wheel (3b) connected via a mechanism
Is a rear frame having a subframe disposed on the rear frame (2) via elevating mechanisms (4a-f), and (7) is a bet cell mounted on the subframe (5). The elevating mechanisms (4a-f) include a pair of lift cylinders (4) pivotally mounted on both sides of the rear frame (2).
a) (4b), rib frames (4c) and (4d) fixed to the upper portions of the lift cylinders (4a) and (4b), and a lift frame protruding rearward from both ends of the rib frame (4d). (4e), lock pin hole (4f), etc., subframe (5) placed on the rib frame (4c) (4d)
The rear part is pivotally attached to the lift frame (4e) by the rear pin (5a), and both ends of the dump cylinder (6) are pivotally connected between the front part of the rear frame (2) and the subframe (5). is doing. By expanding and contracting the lift cylinders (4a) (4b), the sub-frame (5) is moved up and down in a horizontal state. A lock pin (not shown) is inserted into the pin hole (4f) at the raised position, the lift frame (4e) is connected to the rear frame (2), and the dump cylinder (6) is expanded / contracted so that the sub frame (5) is formed. It is tilted around the rear pin (5a).

Further, the bezel (7) has supporting legs (7a) with skids vertically provided on both sides, and lock pins (8) provided on both sides of the subframe (5) are hydraulic cylinders (not shown).
The long holes (7b) protruding from the side portion and fitted in are provided on both sides. The subframe (5) is arranged in the lower position below the bet cell (7) installed on the ground by the support legs (7a), and the subframe (5) is lifted by the elevating mechanism (4a to f) to raise the lock pin ( 8) is inserted into the long hole (7b), and the betz cell (7) is mounted on the subframe (5). When the vehicle is transported in this state and the dump cylinder (6) is extended as shown in FIG. 5, the subframe (5) and the bet cell (7) are tilted upward by the clockwise rotation in the figure around the rear pin (5a). Then, the lower side of the tailgate (10) (10a in the figure is a hinge pin) vertically perpendicular to the rear opening side of the bet cell (7) is automatically opened and unloading (discharging) is performed.

Furthermore, a pin is pivotally attached (13) to the lower rear part of the beth cell (7).
The gate hook (12) is provided, and the spring (14) is connected between the lever (12a) on the base end side of the gate hook (12) and the bracket on the side of the bet cell (7). The gate hook (12) is rotated to the left in the figure, and the pin (1
The tailgate (10) is closed by being locked by 5). The cam plate (16) is pivotally attached (17) to the rear end of the sub-frame (5) with a pin, and the front end of the cam plate (16) is placed opposite to the operating rod (12b) of the gate hook (12). A pin (18) protruding from the lift frame (4e) is provided opposite to the cam portion (16a) of the cam plate (16). First
When the sub-frame (5) and the bet cell (7) are in the horizontal position as shown in the figure, the cam plate (16) is in the horizontal inoperative position, and the sub-frame (5) as shown in FIGS. When the bezel cell (7) is tilted upward, the cam plate (16) is also tilted together with the sub-frame (5). With this tilt, the cam plate (16) is also tilted.
While the cam part (16a) contacts the pin (18),
Rotate around 7). The cam plate (16) is rotated upward, and the gate hook (1
2) is rotated to the right in the figure against the spring bias, and the tailgate (1
It is a tailgate opening / closing device that can be opened by removing it from the pin (15) of (0).

On the contrary, the dump cylinder (6) is shortened and the sub-frame (5) and the bet cell (7) are rotated downward to be horizontal, and the cam plate (16) is also horizontal, and the operating rod (12b) is likewise. Is released, and the gate hook (1
2) rotates leftward in the figure to lock the pin (15) and the tailgate (10) is automatically closed.

In the above-mentioned embodiment, the bet cell-separated dump truck in which the bet cells (7) can be attached to and detached from the sub frame (5) by moving the sub frame (5) up and down and inserting the lock pin (8) into the elongated hole (7b). , The pre-loaded Bethel (7) is mounted on the subframe (5), lifted, fixed and transported, dumped, and then the Bethel (7) is separated, and other Bethel It is possible to mount Beth cells of various sizes by not only waiting time for loading, but also significantly improving the cargo handling performance and efficiency, and easily mounting the Beth cells (7) on the subframe (5). In order to achieve this, the lock pin (8) is inserted into the elongated hole (7b) to form a play between the two. However, due to the rotation of the cam plate (16) pivotally attached to the rear portion of the subframe (5), the operating rod is moved. Cam through (12b) Since the mechanism operates the hook (12), the play does not have a particularly bad influence on the operation, and the gate hook (12) is surely operated corresponding to the dump operation, and the tail gate is associated with the dump operation. The opening and closing of (10) is automatically and reliably performed.

(Effect of the Invention) As described above, the present invention has a subframe that is tiltably provided around the rear pin on the rear frame at the rear of the vehicle body so that the subframe enters below the vessel placed on the ground together with the vehicle body. In a state parallel to the vehicle body of the subframe, facing a fixed lock pin that engages with an elongated hole in the vehicle body traveling direction provided on the same vessel and a spring-biased gate hook that is disposed on the lower rear side of the vessel. Since there is a cam plate that does not interfere with the gate hook and that tilts upward of the subframe to engage with the gate hook and rotate to the gate release side against the spring bias, the slot and the lock are provided. The pin enables easy and safe loading of the vessel even with rough operation, and the cam plate facilitates the entry without interfering with the structure under the vessel when entering the vessel of the subframe. The loading of the vessel is facilitated and the tilt of the sub-frame tilts to rotate the gate hook toward the gate release side, so the cam plate does not come off from the gate hook during the dumping, and the gate hook is reliably operated and controlled. ,
This has the effect of significantly improving the automatic opening / closing performance and operation reliability of the tailgate.

[Brief description of drawings]

FIG. 1 (A) is an overall side view showing an embodiment of the present invention,
1 (B) is an enlarged side view of the rear part of FIG. 1 (A), FIG. 2 is an enlarged side view showing the gate closed state, and FIG. 3 is a side view showing the gate opened state when dumped. Fig. 4 is a side view when the bet cells are separated, and Fig. 5 is an overall side view at the time of dumping,
FIG. 6 is a side view of a main part of a gate showing a conventional example. 2: Rear frame, 5: Subframe 5a: Rear pin, 7: Bethel 10: Tailgate, 12: Gate hook 14: Spring bias 16: Cam plate

Claims (1)

[Scope of utility model registration request] 1. A vessel-equipped subframe that tilts around a rear pin is provided on a rear frame at the rear of the vehicle body, and the subframe is inserted together with the vehicle body under the vessel placed on the ground. A fixed lock pin that engages with a long hole in the direction of travel of the vehicle provided in the vessel and a lower end of the rear portion of the vessel that is rotated by a spring bias to engage the lower end portion of the tailgate opening / closing side. The gate is opposed to the gate hook to be stopped in a state parallel to the vehicle body of the subframe without interference with the gate hook, and the gate hook is engaged by the upward tilt of the subframe to resist the spring bias. A tailgate opening / closing device for a dump truck, which is provided with a cam plate that turns to a release side.