JP2581974B2 - Tipper / Cargo Truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Industrial application field The present invention relates to a cargo equipped with a cargo box that slides on a dump frame pivotally supported by a vehicle body to transport a construction vehicle or the like. More particularly, the present invention relates to a dump truck / cargo truck that can be used as a dump truck for transporting earth and sand when a packing box is fixed to a dump frame.

(2) Conventional technology Conventionally, a freight car for transporting a construction vehicle or the like is provided with a packing box that slides on a dump frame pivotally supported by a vehicle body, and slides the packing box backward from an inclined dump frame.
The unloading of the vehicle is performed with the rear end of the packing box grounded. In addition, this cargo truck can be used as a normal dump truck for transporting earth and sand by fixing a packing box to a dump frame.

By the way, in the above-mentioned dump truck / cargo truck, a door that can open and close the rear part of the packing box, a lower connecting mechanism that pivotally and removably pivotally connects the lower end of the packing door and the packing box, An upper connecting mechanism that pivotally and detachably pivotally connects the upper end of the door and the packing box, a fixed state in which the packing box is fixed to the dump frame, and a fixed releasing state in which the fixing is released. And a slide prevention device capable of selectively switching between the two, and when the slide prevention device is in the fixed state, the lower connecting mechanism is connected and operated in a horizontal posture of the packing box,
In addition, the present applicant has already proposed a device equipped with an opening / closing device that switches the lower connecting mechanism in accordance with a change in the posture of the packing box so that the connection state is released when the packing box is inclined (Japanese Patent Application No. No. 62-255542). In this case, when the cargo box is fixed to the dump frame by the slide prevention device to be used as a dump truck, the posture of the cargo box when the cargo box is tilted together with the dump frame In conjunction with the change, the door opening and closing device automatically switches the lower connection mechanism to the disconnected state, and swings the door around the pivot connection part of the upper connection mechanism by its own weight to discharge earth and sand on the packing box It is possible to do.
On the other hand, when the slide prevention device is switched to the above-mentioned fixed release position and the cargo box is slid rearward with respect to the dump frame to be used as a freight vehicle, a second exclusive use for the cargo box sliding independent of the lower connection mechanism is provided. The lower end of the door can be pivotally connected to the cargo box using the lower connection mechanism 2 above, and vehicles can be unloaded between the cargo box and the road surface by folding the door around the pivot connection. In that case, the door can be used as a step board.

(3) Problems to be Solved by the Invention However, in the above-mentioned conventional apparatus, a load is operated by a door opening / closing mechanism as a lower connecting mechanism for detachably pivotally connecting the lower end of the door and the packing box. One that is linked to a change in the posture of the box (when the packing box is fixed to the dump frame and used as a dump truck), and one that can be connected and released arbitrarily by manual operation (when the packing box is slid backward and used as a freight car) In this case, two lower systems, which are independent from each other, are required. Therefore, the overall structure is complicated and the handling operation is troublesome.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dump truck / cargo truck with a simple structure capable of solving all of the above-mentioned problems of the conventional one.

B. Configuration of the Invention (1) Means for Solving the Problems In order to solve the problems, the invention according to claim 1 includes a cargo box slidably supported in a front-rear direction on a dump frame pivotally supported on a vehicle body. A door that can open and close the rear part of the packing box, a lower connecting mechanism that pivotally and removably pivotally connects the lower end of the door and the packing box, and an upper end of the door. An upper connecting mechanism for pivotally connecting the packing box to the dump box so as to be swingable and detachable, and a selective switching operation between a fixed state in which the packing box is fixed to the dump frame and a fixed releasing state in which the fixing is released. A possible slide blocking device and a load such that the lower connecting mechanism is in a connecting operation state in a horizontal position of the packing box when the slide blocking device is in the fixed state, and is in a disconnected state in the inclined position of the packing box. The lower link mechanism is switched when the box position changes. And a lowering mechanism, wherein the sliding door is maintained in the fixed state when the sliding preventing apparatus is in the fixed state. The opening and closing device functions effectively to allow the switching operation of the lower connecting mechanism, but when the slide prevention device is in the unlocked state, the door opening and closing device is disabled and the lower connecting mechanism is locked in the connecting operating state. 3. The vehicle according to claim 2, further comprising:
According to the invention, in the dumper truck, the lower connection mechanism is connected between the slide prevention device and the lower connection mechanism by disabling the fan opening / closing device when the slide prevention device is in the unlocked state. It is connected via a fan lock device that locks in the operating state, and between the fan lock device and the lower connection mechanism, the switching operation of the lower connection mechanism by the fan opening / closing device is performed by the slide prevention device. A predetermined play is provided so as to be allowed while maintaining the fixed state.

(2) Operation When the slide blocking device is switched to the above-mentioned fixed release state to release the fixation of the packing box to the dump frame, the door lock device disables the door opening / closing device and locks the lower connecting mechanism in the connected operation state. Therefore, even if the packing box is tilted or slid from this state, the lower connecting mechanism maintains the connecting operation state. Therefore, in this state, tilt and slide the packing box,
When the upper connection mechanism is set to the uncoupled state, the folding door is turned down around the pivotal connection portion of the lower connection mechanism, thereby enabling unloading of vehicles and the like between the packing box and the road surface.

On the other hand, when the packing box is tilted integrally with the dump frame in the state where the packing block is fixed to the dump frame by switching the slide prevention device to the above fixed state, the door is opened and closed in conjunction with the change in the posture of the packing box. The device automatically switches the lower coupling mechanism from the previous coupling operation state to the disconnection state, but this switching operation also keeps the slide prevention device fixed without interlocking with the lower coupling mechanism. Thus, according to the switching of the lower connecting mechanism to the uncoupled state, the tilting of the packing box causes the fan door to swing around its pivotal connection section of its upper connecting mechanism by its own weight and mounted on the packing box. Sediment is discharged.

(3) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the dump truck V also has a dump frame 3 pivotally supported by a hinge shaft 2 at the rear end of the vehicle body 1. The dump frame 3 is supported by a dump cylinder 4 mounted between the vehicle body 1 and swingably rearward about a hinge shaft 2, and a packing box 5 is provided above the dump frame 3 for sliding. The cylinder 6 is slidably supported back and forth. As shown in FIG. 5, a slider 9 fixed to the upper and lower surfaces of the flange 3a of the dump frame 3 is fitted into a gap between the flange 7a of the main girder 7 and the auxiliary frame 8 provided at the bottom of the packing box 5. The packing box 5 slides in the front-rear direction along the dump frame 3 while being guided by the slider 9.

At the rear of the packing box 5, there is a door 10 that can open and close the rear.
A lower connecting mechanism Pl pivotally and removably pivotally connected between the lower end of the door 10 and the packing box 5 is provided between the lower end of the door 10 and the packing box 5. An upper connection mechanism Pu is provided between the unit and the packing box 5 for pivotally connecting between the unit and the packing box 5 in a swingable and detachable manner.

When the above-mentioned dump truck / cargo truck V is used as a dump truck for transporting earth and sand, as shown in FIG.
The dump cylinder 4 is extended while the packing box 5 is fixed to the dump frame 3, and the dump frame 3 is inclined backward together with the packing box 5. As a result, the door 10 provided at the rear of the packing box 5 swings around its upper end (that is, the pivotal connection part of the upper connecting mechanism Pu), and the earth and the like mounted on the packing box 5 is discharged. Will be

When the dump truck V is used as a truck for transporting vehicles, the dump cylinder 4 is extended to swing the dump frame 3 rearward, and the slide cylinder 6 is extended to extend the cargo. The box 5 is slid backward. Then, with the skid 11 provided at the rear end of the packing box 5 being in contact with the ground, the door 10 is turned down around the lower end thereof (that is, the pivotal connection part of the lower connection mechanism Pl). Loading and unloading of vehicles between the packing box 5 and the road surface becomes possible, and at this time, the fan door 10 can be used as a crossing plate.

As shown in FIG. 4, on the lower surface of the packing box 5, a slide preventing device A capable of switching between a fixed state in which the packing box 5 is fixed to the dump frame 3 and a fixed releasing state in which the fixing is released, When the slide prevention device A is in the fixed state, the lower connecting mechanism Pl is in the connecting operation state in the horizontal posture of the packing box 5 and is in the disconnected state in the inclined posture of the packing box 5 so as to be in the disconnected state. The lower connecting mechanism Pl is linked to the posture change.
Door opening / closing device B for switching the operation, and the blocking device A provided between the slide prevention device A and the lower connecting mechanism Pl.
Is in the fixed state, the door opening and closing device B is made to function effectively while maintaining the fixed state, and the switching operation of the lower connecting mechanism Pl is allowed. However, when the blocking device A is in the unlocked state, the door is opened. Switchgear B is disabled and lower link mechanism Pl
And a control device D for selectively switching the slide prevention device A between the fixed state and the fixed release state. A predetermined play (between the device C and the lower connecting mechanism Pl such that the switching operation of the lower connecting mechanism Pl by the door opening / closing device B is permitted while the slide prevention device A is maintained in the fixed state. A sliding stroke s between the elongated hole 46a and the pin 42, which will be described later, is provided.

As shown in FIGS. 4 and 6, the operating device D is provided with a vertical axis 12 which is suspended from the lower surface of the packing box 5, and the vertical axis
A first short tube 13 and a second short tube 14 are inserted through the outer circumference of
At 15 is secured. An operation lever 16 and a drive arm 17 are fixed to the first short pipe 13.
A rod 19 connected to the slide prevention device A and the door lock device C is fixed to the other end of the connecting member 18 pivotally supported at one end to 17.

On the other hand, to the second short pipe 14, a regulating arm 22 having a roller 21 at its tip which can contact the regulating member 20 fixed to the dump frame 3 is fixed. A spring 25 is stretched between spring hooks 24 provided on the connecting member 18. As shown in FIGS. 6 and 7, the lower surface of the first short tube 13 and the upper surface of the second short tube 14 facing each other are cut so that the two short tubes 13, 14 can rotate relative to each other by a predetermined angle. Notches 13a and 14a are provided. Therefore, when the first short pipe 13 is urged in the direction of arrow a by the spring 25 via the connecting member 18 and the drive arm 17 and the second short pipe 14 is urged in the direction of arrow b, A gap 26 is formed between the notches 13a and 14a.

As shown in FIGS. 4, 8B and 9B, the slide preventing device A includes a connecting shaft 28 pivotally supported by a pair of left and right brackets 27 provided on the lower surface of the rear part of the packing box 5. The rod 19 of the operating device D is connected to one driven arm 29 fixed to 28. Connecting shaft
A pair of auxiliary arms 30 is fixed to 28, and a pair of slide blocking members 32 pivotally supported by pins 31 on the lower surface of the auxiliary arm 30 and the packing box 5 are connected by rods 33. Therefore, when the operation lever 16 is at the position indicated by the solid line in FIG.
As shown in FIG. 8B, the slide blocking member 32 is engaged with the locking member 34 of the dump frame 3 to prevent the packing box 5 from sliding backward, and the operation lever 16 is at the position indicated by the chain line in FIG. At this time, as shown in FIG. 9B, the slide blocking member 32 is detached from the locking member 34 of the dump frame 3 to allow the packing box 5 to slide rearward.

As shown in FIG. 4, FIG. 8C and FIG. 8D, a pair of hooks 36 pivotally supported by pins 35 are provided at the rear end of the The hook 36 and the lock pin 37 cooperate with each other to constitute the lower connecting mechanism Pl of the present invention.

The door opening / closing device B is provided with a bell crank 39 pivotally supported by a pivot 38 on the lower surface of the packing box 5, and a roller 41 which can abut on a receiving table 40 fixed to the vehicle body 1 at one end thereof. A pin 42 provided at the other end is connected to the tip of a rod 43 having a rear end connected to the hook 36. A spring is provided between the rod 43 and the packing box 5.
A hook 44 is provided to urge the hook 36 in a direction in which the hook 36 is detached from the lock pin 37. Therefore, when the dump frame 3 and the packing box 5 are in a horizontal position, the roller 41 of the bell crank 39 comes into contact with the pedestal 40 as shown in FIG. Lock pin 37
Is engaged. When the dump frame 3 and the packing box 5 are inclined backward, as shown in FIG.
Roller 41 is separated from cradle 40. As a result, the hook 36 is released from the lock pin 37 by the elastic force of the spring 44, and the lower end of the fan door 10 is opened by its own weight.

As shown in FIG. 4, FIG. 9C and FIG. 9D, the door lock device C includes the one driven arm 29 and the other driven arm 3.
A rod 45 connected to the rod 9 'is provided, and a pin 42 provided on the bell crank 38 is slidably engaged in a long hole 46a formed in a connecting member 46 fixed to the tip of the rod 45. . Accordingly, as shown in FIG. 9C, when the rod 19 is moved forward to slide the packing box 5 and the slide blocking member 32 is disengaged from the locking member 34, the rod 45 is moved forward and connected. The rear end of the long hole 46a of the member 46 comes into contact with the pin 42 of the bell crank 39, and the bell crank 39 is locked at the position shown. This prevents the movement of the rod 43 by the spring 44 and locks the hook 36 even if the roller 41 of the bell crank 39 is separated from the cradle 40 when the packing box 5 is slid to the position shown in FIG. 9D. It is held in a state of being engaged with the pin 37.

Next, the operation of the embodiment of the present invention having the above-described configuration will be described.

When the dump truck / car carrier V is used as a dump truck, the operating lever 16 of the operating device D is held at the position indicated by the solid line in FIG. 8A, and the rod 19 is moved rearward. As a result, as shown in FIG. 8B, the rod 33 of the slide prevention device A is pulled backward, and the slide prevention member 32 is engaged with the locking member 34 provided on the dump frame 3. Also, as shown in FIG. 8C, the bell crank of the
The rod 43 is pulled forward by the contact of the roller 41 of 39 with the cradle 40, and the hook 39 is a lock pin at the lower end of the fan door 10.
37 is engaged.

When the dump frame 3 is tilted from this state to the position shown in FIG. 8D, the packing box 5 fixed to the dump frame 3 by the slide blocking member 32 is tilted integrally with the dump frame 3. When the roller 41 of the bell crank 39 separates from the receiving table 40 due to the inclination of the packing box 5, the rod 43 is pulled backward by the resiliency of the spring 44, and the hook 36 is locked by the lock pin 37 at the lower end of the fan 10. Break away from As a result, the door 10 swings rearward about its upper end by its own weight, and the earth and sand loaded on the packing box 5 is discharged. When the bell crank 39 separated from the receiving table 40 is rotated clockwise by the spring 44, the pin 42 is released along the long hole 46a of the connecting member 46 of the door lock device C, and the rod 43 Not to hinder the movement of

When the dump frame 3 is returned to the horizontal position after the discharge of the earth and sand loaded on the packing box 5 is completed as described above,
As shown in FIG. 8C, the bell crank 39 comes into contact with the pedestal 40, and the hook 36 locks the lock pin 37 of the fan 10 again.

When using the dump truck V as a freight vehicle,
By rotating the operation lever 16 of the operation device D to the position indicated by the solid line in FIG. 9A, the rod 19 is pulled forward. This causes the rod 33 of the slide prevention device A to be pushed forward as shown in FIG. 9B, and the slide prevention member 32 is disengaged from the locking member 34 provided on the dump frame 3. continue,
When the sliding cylinder 6 (FIG. 3) is extended after tilting the dump frame 3 backward, the cargo box 5 which has been released from being fixed to the dump frame 3 is slid backward to the position shown in FIG. 9D. Reach. At this time, as shown in FIG. 10A, the second short pipe of the operating device D is
The roller 21 of the regulating arm 22 provided on the dump frame 3
Abuts on the regulating member 20 provided at the position, but the roller 21 of the regulating arm 22 pivots to the position of the dashed line and climbs over the regulating member 20,
The spring 25 returns to the position indicated by the solid line again. At this time, the rotation of the second short pipe 14 is controlled by the notch 14 of the second short pipe 14.
Due to the action of the gap 26 (see FIG. 7) formed by the notch 13a of the first short pipe 13 and the notch 13a of the first short pipe 13, the power is not transmitted to the first short pipe and the drive arm 17.

When the packing box 5 slides to the position shown in FIG. 9D, the roller 41 of the bell crank 39 of the fan door opening / closing device B separates from the cradle 40. However, at this time, since the rod 19 is pulled forward by the operation lever 16 of the operation device D, the rod 45 of the door lock device C connected to the driven arm 29 is pressed forward, and the connecting member 46 The pin 42 of the bell crank 39 is in contact with the rear end of the long hole 46a. Therefore, even if the rod 43 connected to the hook 36 attempts to move rearward due to the elastic force of the spring 44, the long hole of the connecting member 46
Since the clockwise rotation of the bell crank 39 is regulated by 46a, the hook 36 is forcibly held at a position where the hook 36 is engaged with the lock pin 37 of the door 10.

In this manner, when the packing box 5 is slid backward, the lock pin 37 of the fuel door 10 is held by the hook 36. Loading and unloading of vehicles can be performed using the door 10 as a crossing plate.

After the loading and unloading of the vehicle is completed and the door 10 is closed as described above, when the sliding cylinder 6 is contracted and the packing box 5 is slid forward, it is provided on the second short pipe 14 of the operating device D. The control arm 22 has a roller 21 whose dump frame 3
From the rear, and rotates to the position indicated by the solid line in FIG. 10B. At this time, the rotation of the second short pipe 14 to which the regulating arm 22 is attached is controlled by the engagement of the notch 14a of the second short pipe 14 with the notch 13a of the first short pipe 13 (see FIG. 7).
The drive arm 17 is transmitted to the short pipe and automatically returns to the position indicated by the solid line. Thereby, the slide prevention member 32 of the slide prevention device A also returns to the position shown in FIG. 8B, and the packing box 5 is fixed to the dump frame 3 again.

As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the above embodiments, and various small design changes can be made without departing from the present invention described in the claims. It is possible to do.

For example, instead of manually rotating the operation lever 16 of the operation device D, it is possible to use hydraulic pressure or electricity. Also, a pin is attached to bell crank 39 side of the door lock device C.
42, instead of providing a long hole 46a on the connecting member 46 side,
An elongated hole may be provided on the bell crank 39 side and a pin may be provided on the connecting member 46 side.

C. Effects of the Invention According to the dump truck / cargo truck of the present invention described above, in a state where the slide prevention device is switched to the fixed state and the packing box is fixed to the dump frame, and the packing box is tilted together with the dump frame, The door opening / closing device automatically switches the lower connecting mechanism from the previously connected state to the disconnected state in conjunction with the change in the posture of the packing box. Swings around the pivot connecting portion of the container, and can smoothly discharge soil and the like mounted on the packing box. On the other hand, when the slide blocking device is switched to the unlocking state to release the lock of the packing box to the dump frame, the door lock device disables the door opening / closing device and locks the lower connecting mechanism in the connecting operation state. Because
Even if the packing box is tilted or slid from this locked state, the lower connecting mechanism maintains the connecting operation state. Since the door can be turned down around the pivotal connection of the mechanism, loading and unloading of vehicles and the like between the packing box and the road surface becomes possible.

In particular, when the slide prevention device is in the unlocked state, the door opening / closing device is disabled and the lower connection mechanism is locked to the connection operation state by a door lock device that connects the slide prevention device and the lower connection mechanism via a mechanical mechanism. The lower end of the fan door and the packing box can be connected at the time of sliding the packing box without specially preparing the second lower connecting mechanism dedicated to the sliding of the packing box, which is indispensable in the conventional apparatus. Can be reliably pivotally connected, and the structure can be simplified accordingly, which can contribute to cost reduction. Moreover, with a single operation system, the slide prevention device and the door lock device, which have different operation modes, can be simultaneously and mechanically linked with each other, so that the operability is extremely good, and furthermore, the slide prevention device is further improved. Since the door lock device can be reliably operated in conjunction with the switching of the device to the unlocked state, it can also contribute to improving the reliability of the device.

[Brief description of the drawings]

FIG. 1 is an overall side view of a dump truck / carriage truck according to an embodiment of the present invention, FIG. 2 is an overall side view showing the use status as a dump truck, and FIG. 3 is an overall view showing the use status as a truck. FIG. 4 is a side view, FIG. 4 is a plan view of the packing box, FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4, FIG. VII-VII section, Fig. 8A to 8
Fig. D is a plan view of the operating device and a partially enlarged side view of the rear part of the packing box when used as a dump truck. Figs. 9A to 9D are plan views of the operating device and a part of the rear part of the packing box when used as a freight car. The enlarged side view, FIG. 10A and FIG. 10B are plan views of the operating device. A: Slide prevention device, B: Folding door opening / closing device, C:
Door lock device, Pl: Lower connecting mechanism, Pu: Upper connecting mechanism, s: Sliding stroke as play, 1 ... Body, 3 ... Dump frame, 5 ... Packing box, 10 ... door,
36 …… Hook

Claims (2)

(57) [Claims] 1. A packing box (5) supported on a dump frame (3) pivotally supported on a vehicle body (1) so as to be slidable back and forth, and an inflatable door capable of opening and closing a rear portion of the packing box (5). (1
0) and a lower connecting mechanism (P) that pivotally connects the lower end portion of the door (10) and the packing box (5) in a swingable and detachable manner.
l) and an upper connecting mechanism (Pu) for pivotally connecting the upper end of the fan door (10) and the packing box (5) in a swingable and detachable manner.
A slide preventing device (A) capable of selectively switching between a fixed state in which the packing box (5) is fixed to the dump frame (3) and a fixed released state in which the fixing is released, and the slide preventing device When (A) is in the fixed state, the lower connecting mechanism (Pl) is in the connecting operation state in the horizontal posture of the packing box (5), and is in the disconnected state in the inclined posture of the packing box (5). In a dump truck / cargo truck equipped with a fan opening / closing device (B) for switching the lower connection mechanism (Pl) in response to a change in the attitude of the packing box (5), the lower connection with the slide prevention device (A) is provided. When the slide blocking device (A) is in the fixed state between the mechanism (Pl) and the sliding door opening / closing device (B) effectively functioning while maintaining the fixed state, the lower connecting mechanism (Pl) )), The slide operation is allowed. When the stop device (A) is in the unlocked state, the door opening / closing device (B) is invalidated and connected via a door lock device (C) for locking the lower connecting mechanism (Pl) in the connected operation state. A dump truck / cargo truck, characterized in that: 2. A packing box (5) supported slidably back and forth on a dump frame (3) pivotally supported on a vehicle body (1), and an inflatable door capable of opening and closing a rear portion of the packing box (5). (1
0) and a lower connecting mechanism (P) that pivotally connects the lower end portion of the door (10) and the packing box (5) in a swingable and detachable manner.
l) and an upper connecting mechanism (Pu) for pivotally connecting the upper end of the fan door (10) and the packing box (5) in a swingable and detachable manner.
A slide preventing device (A) capable of selectively switching between a fixed state in which the packing box (5) is fixed to the dump frame (3) and a fixed released state in which the fixing is released, and the slide preventing device When (A) is in the fixed state, the lower connecting mechanism (Pl) is in the connecting operation state in the horizontal posture of the packing box (5), and is in the disconnected state in the inclined posture of the packing box (5). In a dump truck / cargo truck equipped with a fan opening / closing device (B) for switching the lower connection mechanism (Pl) in response to a change in the attitude of the packing box (5), the lower connection with the slide prevention device (A) is provided. A mechanism for locking the lower connecting mechanism (Pl) between the mechanism (Pl) and the lower connecting mechanism (Pl) in a connection operating state by disabling the fan opening / closing apparatus (B) when the slide prevention device (A) is in the unlocked state. Connected via the door lock device (C) Door locking device (C)
And the lower connection mechanism (Pl), the switching operation of the lower connection mechanism (Pl) by the door opening / closing device (B) maintains the slide prevention device (A) in the fixed state. A dumper / cargo truck, wherein a predetermined play (s) is provided so as to be allowed.