JP4060582B2 - Opening and closing device for packing box - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a canopy opening / closing device that opens and closes a pair of left and right canopies that are closed so as to cover an opening that opens above a packing box, and more particularly, to a measure for achieving compactness.
[0002]
[Prior art]
Conventionally, as this kind of canopy canopy opening and closing device, as disclosed in, for example, Japanese Patent Publication No. 59-3286, a pair of left and right canopies that are closed so as to cover an opening that opens above the packing box are integrally rotated. The canopy shaft is pivotally supported with respect to the upper ends of the left and right side walls on the left and right sides of the cargo box, and the canopy shaft is driven and connected to each of the canopy shafts. A pair of left and right drive arms that are pivotally supported, a tuning rod pivotally supported between the left and right drive arms, and a left and right direction (vehicle width direction) provided in front of the packing box. And a hydraulic cylinder connected between the drive arms, and the hydraulic cylinder is expanded and contracted to convert each canopy into a closed position and an open position where the canopy lies down along the left and right side walls. Are known. The left and right canopies are opened and closed in a synchronized state by rotating the respective driving arms evenly by the swinging of the synchronizing rod according to the expansion and contraction of the hydraulic cylinder.
[0003]
In this case, in order to evenly rotate each drive arm by the tuning rod according to the expansion / contraction amount of the hydraulic cylinder, one end of the tuning rod is rotatably supported above the pivot portion of one driving rod, The other end is rotatably supported below the pivotal support portion of the other tilting arm.
[0004]
[Problems to be solved by the invention]
However, in the above conventional canopy opening / closing device, the canopy is opened and closed by the amount of expansion / contraction of the expansion / contraction cylinder in the left / right direction. Therefore, the expansion / contraction cylinder side pivot part must be provided above the cargo box side pivot part of the left and right drive arms. In addition, the amount of overhang of the drive arm is larger than the load box side pivotal support portion, and the vertical length of each drive arm is naturally longer. In addition, a link such as a synchronization rod and a telescopic cylinder such as a hydraulic cylinder extend between the drive arms in the left-right direction. Components such as cylinders are very conspicuous.
[0005]
For this reason, the apparatus itself is very bulky and large due to the driving arms having a long vertical length at the upper ends of the side walls on both the left and right sides of the packing box, and structural members such as links and telescopic cylinders connected between the driving arms. You will get an impression.
[0006]
The present invention has been made in view of this point, and an object of the present invention is to provide a canopy opening / closing device for a cargo box that can give a very compact impression to the device itself.
[0007]
[Means for Solving the Problems]
To achieve the above object, solving means taken by the present invention, as the canopy opening and closing device of the load box, is connected to rotate integrally a pair of left and right canopy for closing so as to cover the opening portion opening upward of the packing boxes A canopy shaft that pivotally supports each canopy with respect to the upper ends of the side walls on the left and right sides of the cargo box, and is driven and connected to each canopy shaft. A pair of supported left and right drive arms and a front side of the packing box are provided to extend in the vertical direction, and the drive arms are connected to rotate individually, and each canopy is connected to the closed position and the left and right side walls. A pair of left and right telescopic cylinders that convert to an open position that lies down along the outer surface. In addition, a first link whose base end is rotatably coupled to the canopy shaft, a second link whose one end is rotatably supported at the distal end of the first link, and the second link. The other end of the link is rotatably supported at one end, and the other end is rotatably supported by a pivot shaft at a position outside the upper end of the cargo box. The pivot shaft is fixed at a position lower than the canopy shaft, and the tip of the piston rod of the expansion / contraction cylinder is approximately in the middle of the outer periphery of the arm positioned below the pivot shaft when the canopy is closed. By being rotatably supported at a position, the second link is translated inward and outward between the arm and the first link that rotates inward and outward when the canopies are opened and closed.
[0008]
Because of this specific matter, the canopy is opened and closed by the amount of expansion / contraction of the expansion / contraction cylinder in the vertical direction, so there is no need to provide the expansion / contraction cylinder side pivots above the cargo box side pivots of the left and right drive arms. In addition, the amount of overhang of the drive arm is suppressed, and the vertical length of each drive arm is short. In addition, structural members such as links and telescopic cylinders are not provided between the left and right drive arms so as to extend in the left-right direction, and the space between the left and right drive arms in the upper part of the cargo box is greatly simplified. For this reason, it becomes possible to give a very compact impression to the apparatus itself by the driving arms having a short vertical length at the upper end portions of the side walls on the left and right sides of the packing box and the simplification between the driving arms.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
1 to 3 show a cargo box provided with a canopy opening / closing device according to an embodiment of the present invention. The cargo box 1 is mounted on a chassis such as a cargo handling vehicle or a dump truck (not shown).
[0011]
The packing box 1 includes a bottom plate 1a, left and right side walls 1b and 1c erected at both left and right ends of the bottom plate 1a, front and rear walls 1d and 1e erected at both front and rear ends of the bottom plate 1a, And a pair of left and right canopies 2 and 2 which are closed so as to cover the opening 10 which opens to the top. The rear wall 1e is configured as a tailgate that can be opened downward with its left and right upper ends pivotally supported at the upper positions of the rear ends of the left and right side walls 1b and 1c.
[0012]
Further, a canopy opening / closing device 3 for opening and closing each of the canopies 2 is provided in front of the front wall 1d of the packing box 1.
[0013]
The canopy opening / closing device 3 is rotatably connected to each canopy 2 and canopy shafts 31 and 31 pivotally support the canopy 2 with respect to the upper ends of the left and right side walls 1b and 1c of the cargo box 1, respectively. And a pair of left and right drive arms 4 and 4 pivotally supported by the cargo box and the front of the cargo box 1 (front wall 1d). Extending in the vertical direction, each driving arm 4 is connected so as to be individually rotated, and each canopy 2 is connected to a closed position (position indicated by a broken line in FIG. 3) and the outer surfaces of the left and right side walls 1b and 1c. Hydraulic cylinders 5 and 5 are provided as a pair of left and right telescopic cylinders that are converted into an open position (position indicated by a two-dot chain line in FIG. 3) that lies down.
[0014]
The canopy shafts 31 are provided on the upper end portions of the left and right side walls 1b and 1c of the cargo box 1 so as to extend in the front-rear direction, and are provided at four positions at predetermined intervals in the front and rear direction on the upper end portions of the left and right side walls 1b and 1c. It is rotatably supported by a pair of bearing portions 31a,. Further, each canopy 2 is connected to the canopy shaft 31 in an integrally rotating manner by brackets 21... Projecting between the respective bearing portions 31a, 31a.
[0015]
Further, as shown in FIGS. 4 to 6, each of the drive arms 4 includes a first link 41 whose base end is integrally connected to the front end of the canopy shaft 31 protruding forward of the cargo box 1, and the first link 41. A substantially arc-shaped second link 42 having one end rotatably supported at the tip of the link 41, one end rotatably supported by the other end of the second link 42, and the other end in front of the packing box 1. A substantially crescent-shaped arm 43 that is rotatably supported via a pivot shaft 44 is provided at a position outside the upper end of the wall 1d.
[0016]
Each of the hydraulic cylinders 5 is arranged in a substantially V shape so that the distance between the hydraulic cylinders 5 increases as it goes upward (see FIG. 3), and the lower end of the cylinder tube 51 rotates to the lower inner side position of the front wall 1d of the cargo box 1. It is supported freely. The tip of the piston rod 52 of each hydraulic cylinder 5 is rotatably supported at a substantially intermediate position near the outer periphery of the arm 43 positioned below the pivot shaft 44 of the arm 43 with the canopy 31 closed. (The state indicated by the solid line in FIG. 4) . The supply and discharge of the pressure oil to and from each hydraulic cylinder 5 is performed by a valve (not shown) that equalizes the supply and discharge amount to both hydraulic cylinders.
[0017]
Here, the opening / closing operation | movement of each canopy 2 by the canopy opening / closing apparatus 3 is demonstrated.
[0018]
First, when each canopy 2 is opened, the piston rod 52 is extended by supplying uniform pressure oil to each hydraulic cylinder 5. Then, as shown in FIG. 4, the arm 43 pivots outward about the pivot shaft 44, and the first link 41 pivots outward about the canopy shaft 31 via the second link 42 by approximately 260 °. Let At this time, the second link 42 moves substantially in parallel between the arm 43 that pivots outward about the pivot shaft 44 and the first link 41 that pivots outward about the canopy shaft 31. Move so as to rotate downward.
[0019]
Then, as the first link 41 rotates around the canopy shaft 31, the canopy shaft 31 rotates within each pair of bearing portions 31 a,..., And the canopy 2 rotates outward via the brackets 21. Then, each canopy 2 is opened to an open position (position indicated by a two-dot chain line in FIG. 3) that falls down along the outer surfaces of the left and right side walls 1b and 1c.
[0020]
On the other hand, when each canopy 2 is closed, the piston rod 52 is contracted by discharging the uniform pressure oil from each hydraulic cylinder 5. Then, as shown in FIG. 4, the arm 43 rotates inward about the pivot shaft 44, and the first link 41 is rotated inward around the canopy shaft 31 via the second link 42. Also at this time, the second link 42 moves substantially in parallel between the arm 43 that rotates inwardly around the pivot shaft 44 and the first link 41 that rotates inwardly around the canopy shaft 31. To move inward.
[0021]
Then, as the first link 41 rotates about the canopy shaft 31, the canopy shaft 31 rotates within each pair of bearing portions 31 a,..., And the canopy 2 rotates inward via each bracket 21. Then, when the tips of each other come into contact with each other, each canopy 2 is converted into a closed position (a position indicated by a broken line in FIG. 3) that covers the opening 10 of the packing box 1.
[0022]
Therefore, in the above-described embodiment, the canopy 2 is opened and closed by the amount of expansion and contraction of each hydraulic cylinder 5 in the vertical direction, so that the hydraulic cylinder 5 is positioned above the pivot shaft 44 of the arm 43 of the left and right drive arms 4 and 4. There is no need to provide a support portion (pivot support portion), the amount of protrusion of each drive arm 4 upward from the arm 43 is suppressed, and the vertical length of each drive arm 4 is short. Moreover, no structural members such as links and telescopic cylinders are provided between the left and right drive arms 4 and 4 so as to extend in the left and right direction, and the space between the left and right drive arms 4 and 4 in the upper portion of the cargo box 1 is greatly simplified. Will be. Further, the second link 42 of each drive arm 4 moves substantially in parallel between the arm 43 that rotates about the pivot shaft 44 and the first link 41 that rotates about the canopy shaft 31 and then moves downward. Since each drive arm 4 is configured to move, the upward trajectory of each drive arm 4 includes the trajectory of the first link 41 around the canopy shaft 31 and the trajectory of the arm 43 around the pivot shaft 44. The rotational trajectory of each drive arm 4 can be kept low. Thus, the canopy opening / closing device 3 itself is realized by the drive arms 4 and 4 whose top and bottom lengths are short and the rotation trajectory is kept low at the upper ends of the left and right side walls and the simplification between the drive arms 4 and 4. Can give a very compact impression.
[0023]
In addition, this invention is not limited to the said embodiment, The other various modifications are included. For example, in the above embodiment, the left and right drive arms 4 and 4 and the hydraulic cylinders 5 and 5 are provided in front of the front wall 1d of the packing box 1, but these drive arms and the hydraulic cylinders are covered from above to be protected from wind and rain. In addition, a hook projecting forward may be provided at the upper end of the front wall of the packing box. In this case, the height of the ridge can be kept low by the low rotation trajectory of each drive arm 4, and the overall height of the cargo box can be lowered despite the presence of the heel.
[0024]
【The invention's effect】
As described above, according to the canopy opening / closing device of the present invention, the canopy is opened and closed by the amount of expansion / contraction in the vertical direction of the expansion / contraction cylinder, thereby suppressing the amount of protrusion of the left and right drive arms upward, Combined with simplification by eliminating the structural members extending in the left-right direction between the left and right drive arms in the upper part of the packing box, the apparatus itself can be given a very compact impression.
[Brief description of the drawings]
FIG. 1 is a plan view of a packing box provided with a canopy opening / closing device according to an embodiment of the present invention.
FIG. 2 is a side view of a packing box.
FIG. 3 is a rear view of the packing box.
FIG. 4 is a front view of the left side portion of the canopy opening / closing device as viewed from the front.
FIG. 5 is a plan view of the right side portion of the canopy opening / closing device as viewed from above.
6 is an enlarged view of the vicinity of the drive arm in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packing box 1b Left side wall 1c Right side wall 10 Opening part 2 Canopy 3 Canopy opening / closing device 31 Canopy shaft 4 Drive arm 5 Hydraulic cylinder (extension cylinder)

Claims (1)

A canopy that is connected to a pair of left and right canopies that are closed so as to cover an opening that opens above the packing box, and is pivotally supported with respect to the upper ends of the left and right side walls of the packing box. The axis,
A pair of left and right drive arms pivotally supported by the cargo box while being connected to the respective canopy shafts,
The front of the cargo box is provided extending in the vertical direction, and each drive arm is connected to be individually rotated, and each canopy is in a closed position and an open position in which the canopy lies down along the left and right side walls. A pair of left and right telescopic cylinders for conversion,
Each drive arm is
A first link having a base end rotatably coupled to the canopy shaft;
A second link having one end rotatably supported at the tip of the first link;
One end is rotatably supported on the other end of the second link, and the other end is provided with an arm rotatably supported by a pivot shaft at an upper end portion outer position of the cargo box ,
The pivot shaft is fixed at a position below the canopy shaft, and in a state where the canopy is closed, the tip of the piston rod of the telescopic cylinder is at a substantially intermediate position near the outer periphery of the arm located below the pivot shaft. The second link is translated inward and outward between the arm and the first link that rotates inward and outward when the canopies are opened and closed by being rotatably supported. canopy opening and closing apparatus of the cargo box to.

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