JPS5826645A - Automatic gate opening or closing device of three-side tipper dump truck or the like - Google Patents

Abstract

PURPOSE:To automatically open or close the gates of a three-side tipper dump truck by actuating a locking hook by means of two working pieces and a toggle mechanism. CONSTITUTION:A hook 11 for locking a gate 9 is connected by a rod 21 to a toggle mechanism 30. The toggle mechanism 30 is equipped with a primary working member 42 and a secondary working member 47 which are actuated when the gate is opened or closed. The secondary working member 47 is actuated only when the dump truck dumps goods rearward, on account of which the rear gate will not opened when the truck dumps them at both sides.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic door opening/closing device for a three-turn dump truck or the like.

For example, conventionally, Wi
Since the closing device used the relative displacement of the subframe installed on the vehicle chassis with the cargo box, it was operated by providing a rear door closing position holding mechanism to prevent the rear door from opening during side dumping. There was a problem that it had to be done.

Therefore, the present invention provides an automatic rear sliding door opening/closing device for a three-turn dump truck, etc., in which the sliding door is automatically opened by the relative rotation of the rotating wheels and the cargo box or the vehicle body 7 frame without any operation. The purpose is to

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings.

Reference numeral 1 indicates a loading box for a tri-roll dump truck, and a pair of brackets 2 are welded to the left and right rear of the bottom of the loading box.
A pair of protrusions 4, 4 are provided to protrude downward from each of the open portions, and an engagement pin 5 is fixed to the tip end thereof in the front-rear direction.

On the vehicle body 7 frame side, there is a retaining member 6 (connected to the rotating shaft 3 and rotatably supported at both ends of the side 7 frame 7) with which the engagement bin 5 engages, and the engagement member 6. A hook member 8 that locks the pin 5 in the retaining member 6 is connected to the engaging pin 5.
The hook member 8 and the retaining bottle 5 are engaged and disengaged by a link mechanism or other control mechanism.

Although not shown, a pair of protrusions 4, 4 are provided at the left and right fronts of the bottom of the cargo box, respectively, to protrude downward, and an engagement bin 5 is fixed to the front and back ends of the protrusions 4, and the engagement bin 5 is fixed to the front and rear ends of the protrusions. A retaining member 6 for engaging the engaging pin 5 and a retaining member 7 and a retaining member 8 for locking the engaging pin 5 in the retaining member 6 are provided. At the time of side dumping, the engagement bin 5
The engagement with the 7-degree angle member 8 is 2I on one side of the 4 locations on the front, rear, left, and right! During rear dumping, the rear rotation shaft 6 is secured to the vehicle body frame by the engagement between the engagement pin 5 and the seven lock members 8 (on both rear right and left sides), and the cargo box 1 (bracket 2) is released from the rear part. It is configured to rotate around a rotation shaft 3 as a central axis.

Reference numeral 9 denotes a rear sliding door of the cargo box 1, which is pivotally supported at the left and right ends of the upper part of the cargo box 1, and has bins 10 and 10 protruding from the left and right sides of its lower layer, respectively.

On the other hand, at the rear of the cargo box 1, a locking lever 11.11 whose tip engages with the bin 10.10 is rotatably supported on the support bracket 12 in correspondence with the bin 10.10. ing.

Reference numeral 30 denotes a shaft 31 rotatably supported at the bottom of the cargo box 1 by a toggle mechanism, and a bell crank 62 whose base end is fixed to the shaft 31.
and a curved member 33 whose one end is pivotally connected 39 to the distal end of the bell crank 32. Further, bell cranks 34 and 35 are fixed to the shaft 61, and the bell crank 64 is connected to the cargo box 1 via the link 4o. It is connected to a first actuating piece 42 that is pivoted 41 at the bottom.

Reference numeral 43 denotes a roller attached to the lower end of the first operating piece 42, and the roller 43 is appropriately guided by a guide member 44 attached to the vehicle body frame.

The bell crank 35 is connected via a link 45 to a second actuating piece 47 that is pivotally supported 46 on the rear bottom of the cargo box 1, and the lower end of the second actuating piece 47 is connected to a guide provided upright on the side frame Z. It is adapted to be appropriately guided by member 48.

The rear end of the curved member 33 and the distal end of the lock 7 11 are connected by a fork member 16 and a spring tube 17. The spring tube 17 includes a fixed rod 19 fixed to a cylindrical body 18, and a movable rod 21 biased to shorten the spring tube 1 by a spring 20 built into the cylindrical body 18. and has. The movable mouth, door 2
1 and the rear end of the curved member 33 are integrally connected, and the distal end of the fixed opening 19 is hinged to the base 23 of the fork member 16. The 7-hook portion 24 of the fork member 16 is connected to the lock 7. It is pivotally supported by a pin 25 so as to sandwich the end of the pipe 11.

Reference numeral 26 denotes a protrusion provided on the cylindrical body 18, and a spring 27 is interposed between the protrusion 2 and the bracket. ) is energized 〇In addition, to describe the state of the toggle mechanism 3o when the cargo box 1 is stored, the line connecting the pivot 69 and the bin 25 pivot:;@ is located below the center of the shaft 31. In addition, the first and second actuating pieces 42 and 47 are connected to the guide member 44 and the guide member 4.
It is in contact with 8.

Next, the operation of the above device will be explained. First, during rear dumping, the engagement pins 5 of the protrusions 4 on both ends of the rear rotation shaft 3 are attached to the retaining members 6 on both ends of the side frame 7, and The rear co-moving shaft 3 is locked to the vehicle body frame side.

Next, by extension of a hydraulic cylinder (not shown), the cargo box 1
is rotated upward about the rear rotation shaft 3 as a central axis. Accordingly, the #I2 actuating piece 47 is pressed by the guide member 48 and rotates clockwise around the shaft 46, and the bell crank 32 of the guru mechanism 3o (via the link 45 and the bell crank 35) also moves clockwise. , locking via the spring cylinder 17 and fork member 16 7. 11 is rotated in the direction in which the rear fan door 9 is opened.

When the inclination angle of the cargo box 1 reaches approximately 5 degrees, the lock 7 and the lever 1
1 and the bin 10 are disengaged, and the rear fan door 9 is opened.

Further, when the cargo box 1 rotates downward, the first operating piece 42 comes into contact with the guide member 44, and when the cargo box 1 further rotates downward,
Since the first operating piece 42 rotates counterclockwise, the link 40
The bell crank 34 is rotated counterclockwise around the shaft 31 via the bell crank 34, and the rear fan door 9 is automatically closed (the locking lever 11 and the bottle 10 are engaged) by reversing the above procedure. Ru.

In addition, during side dumping, the cargo box 1 moves up and around the front and rear holding bins 5 on the left or right side (direction perpendicular to the plane of the paper in FIG. 1), but the first and second operating pieces 42. 4
Even if 7 is separated from the guide members 44 and 48, no external force is applied, so the state of the toggle mechanism 30 is maintained as it is.
The rear fan door remains closed. Since the present invention is configured as described above, there is no need to provide a rear fan door closed position holding mechanism to prevent the rear fan door from opening during side dumping, and the number of parts is reduced. The structure is simple, and furthermore, there is no need for any closing operation depending on the dumping direction, resulting in good work efficiency.

In the embodiment, the explanation was given as an automatic door opening/closing device for rear dumping in a three-turn dump truck, but it can also be used when dumping in at least two perpendicular directions, such as left side dumping and rear dumping, or right side dumping. Of course it can be applied. Further, according to the present invention, actuating pieces for operating the toggle mechanism are provided at two locations in the front and back of the cargo box yard, the front actuating piece is used to close the toggle mechanism (for locking the sliding door), and the rear actuating piece is used for closing the toggle mechanism (for locking the sliding door). Since the toggle mechanism is used for opening (to release the sliding door), the sliding door is unlocked at the beginning of the tilting of the cargo box, and just before the cargo box lands on the vehicle body frame (at this time, the sliding door is completely closed). Since the locking operation of the fan door is started when the fan door is in the closed state), the load of the discharged cargo does not have a large effect on the fan door, which prevents the fan door from being damaged by the load. Furthermore, the locking operation of the sliding door is ensured by the seven locking locks.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a sectional side view of a main part of the apparatus of the present invention, FIG. 2 is a plan view of the main part, and FIG. 3 is a rear view of the main part. 1... Loading box, 3... (rear) rotation axis, 5...
・Engagement pin, 6...Engagement member, 8...7. 9...(rear) sliding door, 11...locking 7 hook, 17...spring tube, 18...cylindrical body,
19... Fixed rod, 20.27... Spring, 21... Movable rod, 60... Toggle mechanism, 42... First operating piece, 44.48... Guide member, 47... second actuating piece. Applicant: ShinMaywa Kogyo Shimishiki Company, Oto Uda Seiji Co., Ltd.

Claims (1)

[Claims] A rotating shaft is rotatably provided on one of the cargo box or the seven frames of the vehicle body, and a retaining means for locking the rotating wheel is provided on the other, so that when the cargo box is dumped, the cargo box is attached to the rotating shaft. In a three-turn dump truck or the like that moves up and down around a central axis, a sliding door is pivotally supported at the left and right ends of the upper part of the cargo box so that it can freely rotate upwards, and a bottle or the like is mounted at the lower end of both sides of the sliding door. While the member to be secured is fixedly installed, the above! Locked to the rear of the cargo box 7. a toggle mechanism and first and second operating pieces of the toggle mechanism are provided, and the toggle mechanism and the locking hook are connected to a rod mechanism. A guide member is provided at the front and rear of the seven frames of the vehicle body for guiding the first and second actuating pieces, respectively, and further for opening the locking footer between the cargo box and the tether mechanism. An automatic fan door opening/closing device for a three-turn dump truck, etc., characterized by interposing a spring that biases in a direction.