JPH0322122Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device for interconnecting frames in a box pallet in which frames for preventing cargo from collapsing are erected around the four circumferences of the cargo handling pallet.

Prior art and its problems In this type of box pallet, each frame on four sides is provided so that it can be attached to and detached from the pallet body or raised and folded to make it convenient to transport and store the pallet when it is not loaded with cargo. When in use, these frames can be assembled into a predetermined three-dimensional shape by connecting and fixing adjacent frames in an upright state.

Various types of devices for connecting frames are known in the past, but a typical example is as follows:
As shown in Utility Model Publication No. 53-18146, one frame body adjacent to the other frame has a hook rod which can be slid forward and backward in the horizontal direction, and the hook rods are positioned perpendicularly to the hook rod in an overlapping manner. An operation plate that can freely slide in the vertical direction is provided, and a sliding pin protruding from one side of the hook rod is loosely fitted into an inclined guide hole provided in the operation plate, so that the operation plate can be slid up and down. There are some that are constructed so that the hook rod can be moved forward and backward by movement.

The connecting device with the above configuration is simple in structure and operation and has sufficient connection strength; however,
When you let go of the operation plate while the hook rod is extended, the operation plate will fall under its own weight and the hook rod will automatically move back and forth, making it easy to remove the uncoupled frame from the pallet body or collapse it. During this time, it was necessary to simultaneously hold the operation plates on both sides of the frame in a pulled-up state by hand. For this reason, the above-mentioned removal and lodging operations are inconvenient, and especially when the width of the frame becomes large, multiple operators are required to perform these operations, as one person cannot bend their hands on the operation panels on both sides. It was hot.

Therefore, as a means to improve the above-mentioned drawback, for example, a diagonal hole section with a gentler slope than this slope is formed continuously at the lower end of the tilted hole of the operation plate, and when the operation plate is pulled up, the sliding pin moves into the diagonal hole section. When it is introduced, the movement-limiting protrusion provided on the tail end of the hook rod is pressed against the hook rod guide (Utility Model Publication No. 53-11172), or a hook-shaped locking hole is provided at the lower end of the slanted hole. A structure has been proposed in which a sliding pin is engaged with the locking hole when the operating plate is in the raised position, thereby preventing the operating plate from dropping due to its own weight when the hook rod is in the extended state.

Problems to be Solved by the Invention However, in the proposed structure of the above two examples, the operation plate in the raised position is prevented from falling due to its own weight in the stationary state, but when an external force such as vibration is applied to the pallet, There is a risk that the movement limiting protrusion and the hook rod guide may be pressed together or the engagement between the locking hole portion of the inclined hole and the sliding pin may be released, resulting in poor reliability. The problem is that when moving the device in and out, the operation plate in the raised position does not fall down easily, so it is necessary to release the pressure contact or engagement by applying a shock, such as by striking force, which is rather inconvenient for operation. The dot was hot.

This invention was devised in view of the above circumstances, and is a box pallet frame that can hold the hook rod extremely stably in the advanced position, has great connection strength between the frame bodies, is extremely easy to operate, and has a simple structure. The purpose of this invention is to provide a body connection device.

Means for Solving the Problems For the above purpose, the box pallet frame connecting device according to the present invention has a structure in which one of the two adjacent frames installed around the pallet main body is connected to the other at the tip. A laterally protruding hook rod having a hook portion that can engage with the vertical frame portion of the frame body, a hook rod guide that guides the hook rod so as to be able to move forward and backward in the horizontal direction, and a pivot rod on one side of the hook rod. A rotary cam plate for moving the hook rod forward and backward, which is pivotally connected via a pin so as to be rotatable in a vertical plane, and cam guides on both left and right sides that can slide on the circumferential surfaces that constitute the cam surface of the rotary cam plate, respectively. The rotary cam plate slides into contact with the cam guide on the tip side of the hook rod above the pivot pin, and has a cam curve in which the distance between the sliding contact point and the pivot pin gradually increases as the hook rod retracts. In addition, the center of gravity of the rotary cam plate is located near the tip of the hook rod when the two frames are connected by the hook rod with respect to the pivot pin position, and the center of gravity of the rotary cam plate is located near the tip of the hook rod when the hook rod is in the advanced state. It is set to be located closer to the

Embodiments Hereinafter, this invention will be explained based on illustrated embodiments.

In the figure, 1 is a pallet body made of a flat wooden pallet, 2 is a frame mounting bracket fixed to its four corners, and 3 and 4 are front and rear and left and right frames, both of which are U-shaped and made of metal pipes. Frame 5 and lower horizontal frame 6
Vertical bars 7, 7... and horizontal bars 8 are attached to the peripheral frame consisting of
are arranged.

The frames 3 and 4 are pivotally attached to the frame mounting brackets 2 and 2 via pivot pins 9 and 9 at both ends of the lower horizontal frame 6, and are sequentially rotated to fall down on the main body 1 so as to be folded over each other. It is configured to be foldable, and can be connected in an upright state by frame connecting devices 10, 10 attached to the upper sides of both sides of the front and rear frames 3, 3 located inside the left and right frames 4, 4. Thus, a peripheral wall is formed on the main body 1. Spacer pieces 4a are provided on the left and right sides of the frame 4 to prevent the vertical frame portions 5a, 5a of the frames 3, 4 from coming into direct contact with each other.

In plan view, each frame connecting device 10 is welded and fixed to the vertical frame portion 5a and the vertical crosspiece 7 of the U-shaped frame 5 in the front and rear frame bodies 3 at left and right L-shaped side pieces 11a, 11a, respectively. A substantially U-shaped metal mounting frame 11 that is open outwardly, and a substantially internal frame fixed to the outer surface of the side pieces 11a, 11a via screws 13, 13 at upper and lower side collar pieces 12a, 12a, respectively. Open direction U-shaped metal hook rod guide 12, 12
and a band-shaped metal hook that is inserted between the vertically elongated guide holes 14, 14 formed between the mounting frame 11 and the hook rod guides 12, 12 so as to be able to move forward and backward in the horizontal direction, and has a flange 15a at the tip. A rod 15 and a substantially disc-shaped metal rotary cam plate 1 pivotally attached to the inner surface of the hook rod 15 via a pivot pin 16 at an eccentric position so as to be freely rotatable in a vertical plane.
It consists of 7.

The rotary cam plate 17 has a pin knob 18 protruding from its outer surface at a position substantially radially opposed to the pivot pin 16 and also serves as a stopper. A hollow portion 17a that is transparent from the front to the back is bored in approximately half of one side of the bar (see Figure 3), that is, the half of the tail end of the hook rod when the meridian is taken as the vertical direction. The center of gravity G (see Figure 3) is located near the side half.
Thus, the rotating cam plate 17 is attached to the side pieces 11a, 11a of the mounting frame 11 in a state where the pin knob 18 is located higher than the pivot pin 16, that is, higher than the hook rod 15.
It is arranged to fit in between.

Furthermore, a friction plate 19 made of hard polyurethane resin is adhered to the surface on the tip end side of the hook rod among the opposing surfaces of the side pieces 11a, 11a of the mounting frame 11, and both opposing surfaces are bonded to the cam surface 20 of the rotating cam plate 17. Cam guides 21a and 21b are formed that can slide into peripheral surfaces constituting the cam guides 21a and 21b.

In the box pallet having the above configuration, in order to connect the frames 3 and 4, the frames 3 and 4 with the hook rods 15 in the advanced position are raised up, and the rotating cam plate 1
7 by grasping the pin knob 18 by hand and rotating it in the counterclockwise direction shown in the figure. Along with this, the cam surface 20 comes into sliding contact with the cam guide 21a on the hook rod tip side at the cam curve 20a on the center of gravity side, but the distance between this sliding contact point _P1 and the pivot pin 16 is determined by the rotation of the rotating cam plate 17. , the hook rod 15 moves in and out, and the hook part 1 increases gradually.
5a is engaged with the vertical frame portion 5a of the frame body 4, and both frames 3,
4 comes into contact with the stopper piece 4a, the connection is completed and the connected state shown in solid lines in FIGS. 1, 3 and 4 is achieved.

In this connected state, since the center of gravity G of the rotary cam plate 17 is located closer to the tip of the hook rod than the pivot pin 16, the rotary cam plate 17 is constantly moved counterclockwise in the figure by its own weight. The hook rod 15 is urged to rotate, that is, to pull the hook rod 15 in the retraction direction, and as a result, the connection between the two frames 3 and 4 is firmly maintained. When an external force such as vibration is applied to the box pallet, the impact causes the rotary cam plate 17 to further rotate in the counterclockwise direction as shown in the figure due to its own weight, thereby further weakening the connection between the frames 3 and 4. Become stronger.
The friction plate 19 has the function of preventing slippage at the sliding contact point _P1 and further stabilizing the connected state of both frames 3 and 4.

On the other hand, in order to release the above-mentioned connection state, the rotary cam plate 1
7 in the clockwise direction shown in the figure. That is, as the cam surface 20 rotates, the cam guide 2 on the tail end side of the hook rod at the cam curve 20b portion on the side other than the center of gravity.
At this time, the distance between the sliding contact point P ₂ and the pivot pin 16 gradually increases as the rotating cam plate 17 rotates, so the hook rod 15 moves forward and the hook rod 15a moves into the frame. When the pin knob 18 comes into contact with the upper edge of the hook rod 15 after detaching from the vertical frame portion 5a of the body 4, the hook rod 15 reaches its maximum advanced position as shown by the dashed line in FIGS.

In this advanced position, the center of gravity G of the rotary cam plate 17 is located closer to the tail end of the hook rod than the pivot pin 16, so even if an external force such as vibration is applied to the box pallet, the hook rod 15 remains in the advanced position. is held stably. Therefore, there is no risk that the hook rod will unexpectedly retract, unlike the previously proposed structure. In this case, the pin knob 18 functions as a stopper for preventing excessive rotation of the rotary cam plate 17.

Furthermore, when the frames 3 and 4 are laid down on the main body 1 and transported or stored in a folded state, the hook rod 15 is retracted by rotating the rotary cam plate 17 clockwise in the same way as when connecting. The hook portion 15a engages with the vertical frame portion 5a of the frame body 3 itself and stops as shown in FIGS. 15a, it is possible to prevent accidents in which the worker's clothes, other box pallets, etc. are caught and the worker is injured, and the work efficiency is improved.

In the above embodiment, the center of gravity G of the rotary cam plate 17 is shifted by forming the hollow part 17a.
Even without such deviation, it is possible to achieve the same effect as described above by adjusting the position of the pivot pin 16, or by making the thickness of the rotary cam plate 17 uneven and causing the center of gravity G to deviate. Also good. Furthermore, the cam surface 20
does not need to be a perfect circumference, and may be set to a curved line that deviates from the circumference to some extent in order to make the rotation operation smoother. Further, the friction plate 19 may be omitted. In addition, hook rod guides 12 on both sides,
Various design changes can be made to the detailed structure, such as integrating 12.

Effects of the invention In the box pallet frame connecting device according to this invention, a hook rod that connects and fixes two adjacent frames at the hook portion at the tip is operated by rotating a rotary cam plate to which the hook rod is pivotally attached. Because of this, the connection and release operations can be performed extremely easily without the need for pressing force, and moreover, in both the connection and release states, the weight of the rotating cam plate changes due to the displacement of the center of gravity accompanying its rotation. Since it acts to further stabilize the state, even if vibrations are applied, the strong connected state and the released state where the hook rod is at a certain advanced position can be stably maintained, and the frame can be transported in the folded state. There is a row point that allows the hook part of the hook rod to be in a non-protruding state to prevent it from getting caught during storage.

Furthermore, this invented device has a very simple structure, so it can be manufactured at low cost, is less prone to failures, and has excellent operational reliability.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a perspective view of the frame connection device, Fig. 2 is a front view of the entire box pallet, and Fig. 3 shows the frame connection in the connected state and the released state. A perspective view of the device, FIG. 4 is a cross-sectional view taken along the - line in FIG. 3, and FIG. 5 is a perspective view of the frame connection device during transportation or storage.
FIG. 6 is a sectional view taken along the - line in FIG. 5. 1...Pallet body, 3, 4...Frame body, 5a...
...Vertical frame portion, 10... Frame body connection device, 12... Hook rod guide, 15... Hook rod, 15a... Hook portion, 16...
...Pivot pin, 17...Rotating cam plate, 20...Cam surface, 20a, 20b...Cam curve, 21a, 21
b...Cam guide, G...center of gravity, _P1 , _P2 ...sliding contact points.

Claims (1)

[Scope of utility model registration request] One of the two adjacent frames installed around the pallet main body is provided with a laterally protruding hook rod that has a hook portion at its tip that can engage with the vertical frame of the other frame. a hook rod guide that guides the hook rod so that it can move forward and backward in the horizontal direction; and a rotary cam plate for moving the hook rod forward and backward, which is pivotally connected to one side of the hook rod via a pivot pin so as to be rotatable in a vertical plane. and cam guides on both left and right sides that can be slidably contacted with the peripheral surfaces constituting the cam surface of the rotary cam plate, and the rotary cam plate is slidably connected to the cam guide on the tip side of the hook rod at a position higher than the pivot pin. The sliding contact point has a cam curve in which the distance between the sliding contact point and the pivot pin gradually increases as the hook rod moves back and forth, and the center of gravity of the rotary cam plate is aligned with the pivot pin position, A frame body connection device for a box pallet, which is set to be located near the tip of the hook rod when the bodies are connected, and to be located near the tail end of the hook rod when the hook rod is extended.