JPS6131719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-sided clamping device for cargo handling that is capable of reliably and safely clamping loads such as carton cases stacked in a cubic or rectangular parallelepiped shape on a pallet or the like.

For example, in factories, warehouses, etc., boxes such as carton cases are pallet units loaded on square or rectangular (herein collectively referred to as right-angled quadrilaterals) pallets for convenience in handling such as storage and transportation. However, in many cases, it is necessary to grasp and handle the loaded item itself rather than the entire pallet due to transloading, adding more to the pallet, or partially transporting the pallet.

On the other hand, depending on the economical use of pallets or the palletizing method on a factory production line, in addition to the case shown in Fig. 1a, in which the items are stacked in contact with each other, the cases shown in Fig. 1b are also possible. In some cases, there may be an item b facing the central empty space a on the side of , and in this case, for example, in the conventional clamping device 1a shown in FIG. As a result, conventionally in such cases the items have been handled and loaded manually, which requires a large amount of man-hours and is extremely complicated. Furthermore, with conventional two-sided clamping devices, while the gripping force is large, some items may be pressed too much due to variations in the size of the items, and on the other hand, some items may not be clamped sufficiently. There is also the problem of

The present invention aims to provide a four-sided cargo handling clamp device that can solve these problems, and one embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows the basic configuration of the present invention, and in the figure, the device 1 of the present invention is
The centers of a pair of clamp plates 3, 3, which are formed to be slightly shorter than the side length W of the load L to be handled, are each tilted at approximately 45 degrees so that the internal angle α is approximately 90 degrees, and the legs are spread in a figure eight shape. At least a supporting piece 4 is disposed opposite to and pivotally attached to the substrate 2 and protrudes forward on both sides thereof.
The clamp arms 6, 6 having clamp cylinders 5, 5 at their rear ends are pivotally supported by the clamp plates 3, 6 at the tips of the clamp arms 6, 6.
3, the movable clamp plates 7, 7 are pivotably supported, and the movable clamp plates 7, 7 can be opened and closed, and the movable clamp plates 7, 7 have the same length as the clamp plates 3,
3 to form a square in the closed state, and therefore, as the clamp cylinder 5 operates, the cubic load L can be evenly gripped from four sides between the clamp plate 3 and the movable clamp plate 7.

Figures 4 and 5 show another embodiment in which the four-sided clamping device for cargo handling of the present invention is used as a clamping device for a forklift. The board 2 is movably suspended from a guide shaft e which is horizontally suspended on a finger bar d. can be moved on and positioned. On the substrate 2, the centers of the clamp plates 3, 3, which are formed to be slightly shorter than the minimum side length W of the loaded object L to be transported, are arranged in a figure eight shape at 45 degrees so that the inner angle α is about 90 degrees. It is tilted and pivoted at pivot points a, A, and A, and outer rails 8, 8 are provided on both sides thereof to project forward in parallel and horizontally. The outer rails 8, 8 accommodate slide shafts 9, 9, which are connected at the bottom to rods 10, 10 of clamp cylinders 5, 5 held on the base plate 2,
Therefore, it can reciprocate back and forth by expanding and contracting. The links 11 are pivoted to the pivot points b, B at the tips of the outer rails 8, 8, and the pivot points c, C, C at the other ends of the links 11, 11, and the pivot points d, D at the tips of the slide shafts 9, 9. The bases of the clamp arms 6, 6 are pivoted at a distance equal to the distance r between the pivot points b, B and the pivot points c, C, and the clamp arms 6, 6 are extended and the extended end Movable clamp plates 7, 7 having approximately the same length as the clamp plates 3, 3 at pivot points e, E of
facing each other and supporting each other. The distance R between the pivot points d, D and the pivot points e, E of the movable clamp plates 7, 7 is approximately 45 mm.
It is set to a length that allows it to pass approximately through the center of the oblique side of the loaded object L when it is tilted at .degree., and when the clamp cylinder 5 is fully extended, the link 11 and
The line segments connecting pivot points c, C and pivot points d, D (hereinafter referred to as line segments x, Ru. Therefore, pivot point b~
In Fig. 6, which shows lines e, B to E as diagrams, a point K at a distance R from the pivot points c and C on the extension of the lines x and X has the coordinates y=2rsinθ+Rsinθ, x=
Since R cos θ (where θ is the inclination angle of the link 11), draw an ellipse with the major axis as 2r + R and the minor axis as R. As a result, the pivot points e and E lag behind the point K by an angle θ° and move while drawing an ellipse to load. It can come into contact with an object approximately at the center at an angle of about 45 degrees.

However, the device of the present invention opens the movable clamp plate 7 by extending the clamp cylinder 5 and pushing up the pivot points d and D, while at the same time moving the load L stacked in a square bottom surface in the diagonal Z direction. and drive the shift cylinder f to align the center of the device with the line Z, then advance the vehicle until the two sides of the load L come into contact with the clamp plates 3, 3, and then reduce the clamp cylinder 5. Particularly, the movable clamp plate 7 moves in an elliptical orbit as described above together with the slide shaft 9 moving inward, and cooperates with the clamp plates 3, 3 to close the square shape and close the other two sides of the load. to squeeze.

As described above, the device of the present invention is capable of handling two loads stacked by clamp plates with legs spread at an angle of about 90 degrees.
Since it receives the surface and the other two sides can be opened and closed, and in the closed state it is pressed and gripped by a movable clamp plate that forms a square in cooperation with the clamp plate, the gripping force is distributed and the pressing can be done evenly, making it safe and reliable. In addition to being able to clamp the stacked items L to prevent them from falling off and becoming unbalanced, it also ensures that pressing force is applied to all items even when there is a void b in the center as shown in Figure 1b. Since the clamping force is more uniform, the pressing force can be evened out, and damage to the product due to excessive load can be prevented.

Furthermore, in the device of this embodiment shown in FIGS. 4 and 5, the movable clamp plate rotates in an elliptical orbit, so that even if the dimensions of the loaded object change, the point of application of force can be maintained approximately at the center of that side. In addition to being able to always clamp the loaded items in a well-balanced manner, the collision force at the tip of the movable clamp plate can be reduced and the length of the plate can be increased, making it possible to equalize the clamping force, making it more effective in preventing carton cases, etc. from falling off or being damaged. This makes it possible to prevent

The device of the present invention can grip not only square items but also rectangular items by changing the side length of each clamp plate, and can be attached not only to forklifts but also to various cargo handling devices such as stacker cranes. It can also be used.

[Brief explanation of the drawing]

Figures 1a and b are schematic perspective views illustrating stacking of boxes onto pallets, Figure 2 is a plan view of a conventional two-sided clamping device, and Figure 3 is an embodiment of the device of the present invention. 4 is a perspective view illustrating another embodiment of the device of the present invention used in a forklift, FIG. 5 is a plan view showing the device taken out, and FIG. 6 is its operation. FIG. 2... Board, 3... Clamp plate, 6...
Clamp arm, 7...movable clamp plate,
8... Outer rail, 9... Slide shaft, 11
...Link, r...Link length, α...Interior angle.

Claims (1)

[Scope of Claims] 1. A pair of clamp plates that are pivoted and opposed to the base plate with their legs spread apart in a figure eight shape so that their internal angles form approximately 90°; A four-sided clamping device for cargo handling, comprising a movable clamp plate that forms a right-angled quadrilateral and can be opened and closed. 2. The four-sided clamp device for cargo handling according to claim 1, wherein the right-angled quadrilateral is a square.