JP2021062934A - Traction auxiliary apparatus of sheet pallet, sheet pallet with traction auxiliary apparatus, and traction method of sheet pallet - Google Patents

Abstract

To provide a traction auxiliary apparatus of a sheet pallet capable of reliably executing traction operation of the sheet pallet and reducing cost, a sheet pallet with a traction auxiliary apparatus, and a traction method of the sheet pallet.SOLUTION: A traction auxiliary apparatus 10 of a sheet pallet comprises: a first holder 12 which includes a stand-up receiving surface 12A1 which receives a back surface of a stand-up part 22A in which a portion on which a cargo at an edge 22 of a sheet pallet 20 is not placed is bent upward and a lower receiving surface which gets under the back surface opposed to a floor surface at the edge of the sheet pallet from the stand-up receiving surface to extend; a second holder 14 which includes a pressing surface 14A superposed with the first holder 12 via the edge 22 of the sheet pallet 20 to press a surface of the stand-up part 22A at the edge 22 of the sheet pallet 20; and a traction member 16 which is coupled to the second holder 14.SELECTED DRAWING: Figure 2

Description

The present invention relates to a traction assist device for a seat pallet, a seat pallet with a traction assist device, and a method for towing a seat pallet.

Conventionally, for example, inside a container transported by sea, a package to be transported is often placed on a sheet pallet laid on the floor surface. By towing this seat pallet, luggage can be unloaded from the container.

Here, since the sheet pallet is usually made of a relatively soft material such as polypropylene (PP), it is easily damaged. For this reason, during cargo handling work in which the seat pallet on which the luggage is placed is towed and unloaded from the container, it is necessary to securely grip and tow the seat pallet so that the seat pallet does not fall out due to damage. It is known to use a push-pull forklift as cited in Patent Document 1.

A push-pull forklift is configured by attaching an optional device called a push-pull attachment to the fork portion of a normal forklift. The push-pull attachment includes, for example, a plate-shaped platen placed on a fork, a pulling gripper that slides freely in the horizontal direction and a vertical direction, and a propulsion face plate. In this configuration, the gripper grips the end of the seat pallet at a position in front of the tip of the platen placed on the fork, and slides horizontally toward the base of the platen to allow the load to be loaded. The entire sheet pallet is taken onto the upper surface of the platen.

For the gripping operation and the sliding operation of the gripper, the push-pull attachment requires a member for driving such as a hydraulic device in addition to a platen and a gripper, and the number of members is large, and the structure is relatively complicated. For this reason, the push-pull attachment is very expensive, and for the micro cargo handling company, there is a problem that the initial cost is high, the burden is heavy, and the spread is not progressing.

In addition, the push-pull attachment is convenient because it has the function of both pulling and pushing the seat pallet carrying the cargo, but the movable distance of the seat pallet is the extension of the face plate in the pushing operation. There is also a problem that the sheet pallet, which is constrained by the limit and is farther than the movable distance, must be moved within the movable distance by some means, and it takes time and effort twice.

On the other hand, the invention disclosed in Patent Document 1 provides a means for solving the drawback of requiring an expensive device such as a hydraulic device in the push-pull attachment, the drawback of a short moving distance, and the like. It is premised on the use of an expensive forklift, and although it proposes a manual toggle clamp device without using an expensive hydraulic device, it is still complicated, though not as much as a hydraulic device, because it has a toggle mechanism. Needs an expensive structure.

Further, the method of gripping the seat pallet follows the method of the push-pull attachment in which the seat pallet is pressed against the substrate by a gripper from above perpendicular to the towing direction. In this way, in the method of gripping the seat pallet by pressing it with a gripper from above perpendicular to the traction direction, the frictional force generated between the lower surface of the seat pallet and the floor surface due to the load of the load placed on the seat pallet is applied. It is necessary that the static friction force generated between the tip of the gripper and the upper surface of the seat pallet and between the lower surface of the seat pallet and the substrate due to the pressing force of the gripper is larger than the traction force for pulling against it. Therefore, it is necessary to increase the traction force as the load becomes heavier, and it is necessary to increase the pressing force of the gripper as the traction force increases. There is a problem that it is not suitable for towing heavy loads.

JP-A-2002-173296

It is not that there was no request or attempt to consider an effective and inexpensive device other than the conventional push-pull attachment as described above, but it is possible to solve the above problem and tow reliably without damaging the seat pallet. The reality is that practical and inexpensive equipment has not yet been provided. Therefore, there is a demand for a new technique capable of reliably executing the towing work of the seat pallet and reducing the cost.

The present invention has been made by paying attention to the above-mentioned problems, and is capable of reliably executing the traction work of the seat pallet and reducing the cost. The traction assist device of the seat pallet, the seat pallet with the traction assist device, and the seat. It is an object of the present invention to provide a method of towing a pallet.

The traction assisting device for a seat pallet according to claim 1 has a rising receiving surface that receives the back surface of a rising portion in which a portion of the end portion of the seat pallet where no luggage is not placed is bent upward, and a rising receiving surface. A first presser foot having a lower receiving surface that sneaks under the back surface facing the floor surface at the end of the sheet pallet and extends from the surface, and a first presser foot with the end of the sheet pallet between them. It has a second presser foot having a vertical presser surface for pressing the surface of the rising portion at the end of the seat pallet, and a traction member connected to the second presser foot. The front surface of the sheet pallet is the surface on which the luggage is placed, and the back surface is the surface on which the luggage is not placed.

Generally, in cargo handling work using a seat pallet, the end of the seat pallet on which the luggage is placed is towed to move the luggage on a floor surface or the like on which the seat pallet is laid. In the traction assisting device for the seat pallet according to claim 1, the lower receiving surface of the first presser foot extends to the back surface of the end portion of the seat pallet, and the rising receiving surface extends to the back surface of the end portion of the seat pallet. Support by receiving the back side of the riser. Further, when the first presser foot and the second presser foot are overlapped with the end portion of the sheet pallet in between, the vertical presser surface of the second presser foot presses the surface of the rising portion at the end portion of the sheet pallet.

Here, when the traction member is connected to the second presser foot, a wire or the like is hung on the traction member, and the traction member is pulled by a traction power device such as a winch, the vertical presser surface of the second presser foot is bent at the end of the seat pallet. The rising portion is pressed against the rising receiving surface of the first presser foot. Therefore, at the end of the seat pallet, the corners of the second presser foot bite into the seat pallet due to the frictional force generated between the seat pallet due to the pressing force from the first pressing tool and the second pressing tool and the pressing force. Due to the mechanical resistance generated by the pallet, it can move integrally with the traction member without falling out from between the first presser foot and the second presser foot.

By gripping the seat pallet using the traction force in this way, a heavy load does not require a separate device for imparting a gripping force such as a hydraulic device or a toggle clamp device for gripping the seat pallet as in the prior art. Can be moved. In the configuration of the present invention, for the purpose of increasing the pressing force for tightening the first pressing tool and the second pressing tool, both pressing tools holding the seat pallet in combination with a clamp or other fasteners are used. It can also be tightened.

In the traction assist device for the seat pallet according to claim 2, the traction member is detachable from the traction power device. According to the above configuration, the first presser foot, the second presser foot, and the tow member can be carried to the next cargo handling work place by removing the tow member from the tow power device after moving the load to a predetermined place. Therefore, the towing assist device can be reused, and the running cost of the towing work can be suppressed. Further, if the towing member is detachable from the second presser foot, the convenience of storing and transporting the towing assist device is improved.

In the traction assisting device for a seat pallet according to claim 3, a male screw portion is formed at one end of the traction member, a ring portion is provided at the other end, and the traction member is provided on the second presser foot. A female threaded portion is formed in which the male threaded portion of the screw is screwed. According to the above configuration, the traction member is connected to the second presser foot by screwing the male screw portion of the traction member that has penetrated the through hole of the first presser foot into the female thread portion of the second presser foot. Can be done. Then, for example, by hooking the hook attached to the wire to the ring of the traction member, the distance between the traction member and the traction power unit can be freely extended or shortened, and an arbitrary positional relationship between the seat pallet and the traction power unit becomes possible. You can prepare for towing work smoothly according to the situation.

In the traction assisting device for the seat pallet according to claim 4, a non-slip sheet is provided between the first presser foot and the end portion of the seat pallet, or between the second presser foot and the end portion of the seat pallet. It is arranged. According to the above configuration, by inserting the non-slip sheet in between, the sheet pallet is further suppressed from falling off.

In the traction assisting device for the seat pallet according to claim 5, the second presser foot includes a lower presser surface that presses the surface of the base portion of the end portion of the seat pallet, and the rising and lower receiving surfaces of the first presser foot. A screw member that attracts the vertical pressing surface of the second pressing tool and the corner portion formed by the lower pressing surface to the corner portion formed by the first pressing tool is fastened from the first pressing tool to the second pressing tool. According to the above configuration, the corners of the second presser foot bite into the corners of the first presser foot and the end portion of the sheet pallet is pressed, so that the seat pallet is less likely to shift.

In the traction assisting device for the seat pallet according to claim 6, the first presser foot and the second presser foot have a length equal to the width along the end portion of the seat pallet in the traction direction, and both ends of the first presser foot. It has a side wall provided on the side wall and a support member provided on the side wall that supports both ends of the second presser foot so as to be detachable from the first presser foot. According to the above configuration, it is possible to prevent lateral displacement when the second presser foot is arranged with respect to the first presser foot at the time of towing, and the unity of the first presser foot and the second presser foot is enhanced. It becomes difficult to lose the first presser foot and the second presser foot of the traction assist device.

In the seat pallet traction assist device according to claim 7, the second presser foot is a U-shaped fixture having a recess in which the first presser foot and the end portion of the seat pallet are fitted, and a traction member of the fixture. It is provided with a fixing bolt inserted into a female screw hole provided on the side side wall. According to the above configuration, the second presser foot is fitted to the first presser foot, and the fixing bolt presses the side wall portion of the first presser foot, whereby the seat pallet is sandwiched between the first presser foot and the second presser foot. Since the end of the bolt can be pinched, the work becomes easy.

The seat pallet with a traction assist device according to claim 8 includes a seat pallet, a rising receiving surface that receives the back surface of the rising portion of the end portion of the bent seat pallet, and an end portion of the seat pallet from the rising receiving surface. The first presser foot provided with the lower receiving surface extending to the back surface of the sheet pallet and the end portion of the sheet pallet are overlapped with the first presser foot tool to press the surface of the rising portion of the end portion of the seat pallet. It has a second presser foot provided with a vertical presser foot surface and a traction member connected to the second presser foot.

According to the above configuration, similarly to the traction assisting device for the seat pallet according to claim 1, the end portion of the seat pallet does not easily come off between the first presser foot and the second presser foot, and the traction member and the traction member. Move as one. Therefore, the luggage can be moved without using a gripper that hydraulically holds the end of the seat pallet.

The method for towing a seat pallet according to claim 9 is a first sheet in which the towing assist device for the seat pallet according to any one of claims 2 to 7 is mounted inside a container. A step of attaching to the end of the pallet, a step of pulling the first seat pallet through the attached traction assist device and lowering the first load to the outside of the container, and a step of unloading the traction assist device from the first seat pallet. The removal step, the step of attaching the removed traction assist device to the end of the second seat pallet on which the second luggage is loaded inside the container, and the traction assist device to pull the second seat pallet. Includes a step of unloading the second load to the outside of the container.

According to the above configuration, by removing the traction assist device from the first seat pallet after unloading the first load, the traction assist device can be reused for unloading the next second load. Therefore, the running cost of towing work can be suppressed.

According to the seat pallet towing assist device according to the present invention, the seat pallet towing operation can be reliably executed and the cost can be reduced. Can be provided.

It is a perspective view explaining the structure of the traction assist device of the seat pallet which concerns on embodiment of this invention. FIG. 5 is a cross-sectional view of a traction assisting device for a seat pallet according to the present embodiment in a vertical plane at the position of line 2-2 in FIG. It is a side view explaining the pulling method of the sheet pallet which concerns on this embodiment with a partial cross section (the 1). It is sectional drawing explaining the pulling method of the sheet pallet which concerns on this Embodiment (the 2). It is a side view explaining the pulling method of the sheet pallet which concerns on this embodiment with a partial cross section (No. 3). It is a side view explaining the pulling method of the sheet pallet which concerns on this embodiment with a partial cross section (the 4). It is sectional drawing explaining the traction assist device which concerns on the 1st modification of this embodiment. It is a perspective view explaining the traction assist device which concerns on the 2nd modification of this embodiment. It is sectional drawing explaining the traction assist device which concerns on the 3rd modification of this embodiment. It is sectional drawing explaining the traction assist device which concerns on 4th modification of this embodiment. It is a figure explaining another example of how to wind a sheet pallet in a cross section of a traction assist device in a vertical plane at the position of line 2-2 in FIG. It is a perspective view explaining the structure of the traction assisting device of the seat pallet which concerns on 5th modification of this embodiment. It is a figure explaining the traction assisting device of the seat pallet which concerns on the 6th modification of this embodiment in cross-section with a vertical plane at the position of line 2-2 in FIG. It is a perspective view explaining the structure of the traction assisting device of the seat pallet which concerns on 7th modification of this embodiment. It is a figure explaining the traction assisting device of the seat pallet which concerns on the 7th modification of this embodiment in cross-section with a vertical plane at the position of a fixing bolt.

An embodiment of the present invention will be described below. In the description of the drawings below, the same parts and similar parts are designated by the same reference numerals or similar reference numerals. However, the drawings are schematic, and the relationship between the thickness and the plane dimension, the ratio of the thickness of each device and each member, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, there are parts in which the relations and ratios of the dimensions of the drawings are different from each other.

<Structure of traction auxiliary member>
As shown in FIG. 1, the traction assisting device 10 of the seat pallet according to the present embodiment (hereinafter, also simply referred to as “traction assisting device 10”) is a first presser foot 12, a second presser foot 14, and a traction member 16. Has. The first presser foot 12 and the second presser foot 14 are superposed on each other with the end portion 22 of the sheet pallet 20 in between.

The first non-slip sheet 13 is arranged between the first presser foot 12 and the end portion 22 of the sheet pallet 20, and the second anti-slip sheet 15 is arranged between the second presser foot 14 and the sheet pallet 20. Is placed. Even if only one of the first non-slip sheet 13 and the second non-slip sheet 15 is arranged, the traction assist device can be realized.

(Sheet pallet)
The sheet pallet 20 is made of, for example, PP, and has a thickness of, for example, about 0.6 mm to about 3.0 mm. The sheet pallet 20 has a rectangular shape having an area larger than the bottom surface of the luggage 40 placed on the upper surface in a plan view. For example, when the bottom surface of the luggage 40 is about 1000 mm × about 1000 mm, the rectangular dimensions of the sheet pallet 20 on which the luggage 40 is placed can be set to about 1500 mm × about 1500 mm, about 1500 mm × about 2000 mm, and the like.

The end portion 22 of the seat pallet 20 is a surplus portion on the upper side where the luggage 40 does not exist, and has a rising portion 22A and a base portion 22B. The rising portion 22A and the base portion 22B are adjacent to each other at the end portion 22 of the bent sheet pallet 20 with the bending line interposed therebetween. The end portion 22 of the seat pallet 20 is sandwiched between the first presser foot 12 and the second presser foot 14 of the traction assist device 10, and the seat pallet 20 is an external traction power device via the traction assist device 10. It is towed in the towing direction D by 30 (see FIG. 5). Hereinafter, the traction assisting device 10 will be specifically described.

(1st presser foot)
The first presser foot 12 is an L-shaped member in a side view or a cross-sectional view, and is made of a lightweight metal material such as aluminum. As the material of the first presser foot, another metal material such as steel or a non-metal material as long as it has appropriate strength may be adopted. The width measured along the longitudinal direction of the first presser foot 12 (the direction from the upper left side to the lower right side in FIG. 1) is substantially the same as the width in the longitudinal direction of the end portion 22 of the sheet pallet 20, for example. , Approximately 1500 mm. The width of the first presser foot 12 in the longitudinal direction may be longer or shorter than the width of the sheet pallet 20, and can be appropriately changed.

The first presser foot 12 includes a side wall portion 12A and a mounting portion 12B. Both the side wall portion 12A and the mounting portion 12B have a flat plate shape and are substantially orthogonal to each other to form an L-shape of the first presser foot 12. The mounting portion 12B is arranged on the floor surface G, and the side wall portion 12A stands vertically upward from the mounting portion 12B. In the connecting portion between the side wall portion 12A and the mounting portion 12B, which corresponds to the L-shaped corner, the lower portion of the outer surface of the connecting portion is along the direction from the right side to the left side (traction direction D) in FIG. It is desirable that the floor surface G is curved so that the gap between the connecting portion and the floor surface G is widened, but the degree of curvature can be appropriately selected, including those having no curvature at all.

The side wall portion 12A and the mounting portion 12B extend so as to be substantially orthogonal to the traction direction D in a plan view. That is, the longitudinal direction of the first presser foot 12 and the traction direction D are orthogonal to each other. The length measured along the pulling direction D of the mounting portion 12B is, for example, about 100 mm, and the height of the side wall portion 12A is, for example, about 50 mm. The length of the mounting portion 12B and the height of the side wall portion 12A can be changed as appropriate.

The initial angle formed by the side wall portion 12A and the mounting portion 12B in the towing direction D can be appropriately changed when it is necessary to route the seat pallet on which the cargo is placed in order to change the direction of the seat pallet. The first presser foot 12 and the second presser foot 14 grip one end of the seat pallet 20 in parallel along the edge, so that the traction force acts evenly on the entire surface of the seat pallet 20. That is, the traction assisting device 10 according to the present embodiment is configured to realize a positional relationship or an angular relationship so that the seat pallet 20 is not torn by a local force.

At the initial stage in which the seat pallet 20 is sandwiched and set by the traction assisting device 10 in order to pull the seat pallet 20, a slight deviation from the vertical may occur. However, once the towing is started, the deviation naturally becomes vertical with the movement, so the deviation of the angle at the time of setting can be almost ignored. Also, if you want to direct the direction of the sheet pallet 20 at the place where the sheet pallet 20 is first placed to a different direction at the place where you tow and move it, you dare not to face the front of the sheet pallet 20 but at the edge of a different side. It is also possible to grip and pull the portion. In this case, routing occurs at the initial stage of traction, and after the orientation of the seat pallet 20 is changed by routing, the traction shifts to normal linear traction.

As shown in FIG. 2, the rising receiving surface 12A1 which is the inner wall surface of the side wall portion 12A is the back surface of the rising portion 22A of the end portion 22 of the bent sheet pallet 20 (the left side of the rising portion 22A in FIG. 2). Surface) is received via the first non-slip sheet 13. The lower receiving surface 12B1, which is the upper surface of the mounting portion 12B, slips from the rising receiving surface 12A1 under the back surface of the base portion 22B of the end portion 22 of the sheet pallet 20 (the lower surface of the base portion 22B in FIG. 2). Postpone. The lower receiving surface 12B1 receives and supports the back surface of the base portion 22B with the first non-slip sheet 13 interposed therebetween.

A circular through hole 12C is provided at a height substantially at the center of the side wall portion 12A in the longitudinal direction and substantially at the center in the vertical direction. The diameter of the through hole 12C is larger than the diameter of the shaft at one end of the towing member 16 inserted into the through hole 12C. In the present embodiment, the number of through holes 12C is one, but two or more may be provided.

(1st non-slip sheet)
The first non-slip sheet 13 is, for example, a member using a rubber material having a large coefficient of static friction, and is joined to the first presser foot 12 with an adhesive or the like. In the present embodiment, the first non-slip sheet 13 is mounted on the upper surface of the seat pallet 20 side (upper side in FIG. 2) of the mounting portion 12B and the wall surface of the side wall portion 12A on the sheet pallet 20 side (right side in FIG. 2). At the top, it is arranged so as to extend over the entire longitudinal direction. The material of the first non-slip sheet 13 is not limited to the rubber material, and can be appropriately changed as long as it has a large static friction coefficient such as urethane. Further, the thickness of the first non-slip sheet can be changed as appropriate.

The arrangement shape of the first non-slip sheet 13 is not limited to this, and can be appropriately changed as long as it comes into contact with the end portion 22 of the sheet pallet 20. For example, the first non-slip sheet 13 may be partially arranged on each of the rising receiving surface 12A1 and the lower receiving surface 12B1. A through hole 13C (see FIG. 4) is provided at a position corresponding to the through hole 12C of the first non-slip sheet 13.

As the material of the first non-slip sheet 13, many materials can be used. For example, in addition to rubber, cloth, particularly coarsely woven cloth, non-woven fabric, rough wallpaper, Japanese paper, etc. can also be used. is there. The friction coefficient of the material of the first non-slip sheet 13 may be at least larger than the friction coefficient when the surface of the first presser foot 12 and the surface of the sheet pallet 20 are in direct contact with each other. Further, if the above-mentioned various materials are impregnated or impregnated with a slipping agent such as rosin or pine tar, the slipping effect is further enhanced.

Further, for example, a non-slip material having a thin wire net attached to one side of the double-sided tape is prepared, the adhesive surface of the double-sided tape is attached to the first presser foot 12 side to fix it, and the wire net is attached. The other surface on the other side can also be brought into contact with the sheet pallet. Since the sheet pallet is made of elastic plastic, if a pressing force is applied to the first presser foot 12 and the sheet pallet, the wire can be prevented from biting into the surface of the sheet pallet to a certain extent and slipping significantly. As described above, as the non-slip sheet, various materials can be used in various shapes.

(2nd presser foot)
As shown in FIG. 1, the second presser foot 14 has a rectangular parallelepiped shape with a square bottom surface, and is made of a lightweight metal material such as aluminum. As the material of the second presser foot, another metal material such as steel or a non-metal material as long as it has appropriate strength may be adopted. Further, a composite material in which a plurality of materials are combined, for example, a material having a plastic material around it and having a metal core material inside may be used. The second pressing tool 14 extends so as to be substantially orthogonal to the pulling direction D in a plan view, and is arranged inside the L-shape of the first pressing tool 12. The width measured along the longitudinal direction of the second presser foot 14 is substantially the same as that of the first presser foot 12. That is, the lengths of the first presser foot 12 and the second presser foot 14 in the longitudinal direction are all substantially the same as the length along the end 22 of the sheet pallet 20. The initial angle formed by the second presser foot 14 with the towing direction D can be appropriately changed when it is necessary to route the seat pallet on which the cargo is placed in order to change the direction of the seat pallet.

The length measured along the pulling direction D of the second presser foot 14 is, for example, about 40 mm, and the height in the vertical direction is, for example, about 40 mm. The dimensions of the second presser foot 14 can be changed as appropriate. Further, the shape of the second presser foot 14 is not limited to the rectangular parallelepiped shape, and can be appropriately changed to another geometric shape such as a cylindrical shape.

As shown in FIG. 2, the second pressing tool 14 includes a vertical pressing surface 14A and a lower pressing surface 14B. The vertical holding surface 14A presses the surface of the rising portion 22A of the end portion 22 of the sheet pallet 20 (the surface on the right side of the rising portion 22A in FIG. 2) via the second non-slip sheet 15. The lower pressing surface 14B presses the surface of the base portion 22B of the end portion 22 of the sheet pallet 20 (the upper surface of the base portion 22B in FIG. 2) with the second non-slip sheet 15 interposed therebetween. The lower receiving surface 14B of the second presser foot is not essential.

In the second presser foot 14, a female screw portion 14C into which the male screw portion 16A of the traction member 16 is screwed is formed at a height substantially at the center in the longitudinal direction of the second presser foot 14 and at a height substantially in the center in the vertical direction. ing. The female screw portion 14C is provided so as to correspond to a position substantially concentric with the through hole 12C of the first presser foot 12.

(2nd non-slip sheet)
Like the first anti-slip sheet 13, the second anti-slip sheet 15 is, for example, a member using a rubber material having a large coefficient of static friction, and is joined to the second presser foot 14 with an adhesive or the like. In the present embodiment, the second anti-slip sheet 15 is arranged so as to extend over the entire longitudinal direction on the lower surface of the second presser foot 14 in FIG. 2 and on the left side surface of the second presser foot 14. ing.

However, the arrangement shape of the second non-slip sheet 15 is not limited to this. As long as it comes into contact with the end 22 of the sheet pallet 20, it can be changed as appropriate. For example, the second non-slip sheet 15 may be partially arranged on the lower surface and the left side surface of the second presser foot 14. The second non-slip sheet 15 is provided with a through hole 15C (see FIG. 4) at a position corresponding to the through hole 12C of the first presser foot 12 and the through hole 13C of the first non-slip sheet 13. ..

(Towing member)
The towing member 16 is made of a metal such as steel, and a male screw portion 16A is formed on the peripheral surface of one end (right end in FIG. 2) of a rod shape, and a ring portion 16B is formed at the other end. Is provided. The male screw portion 16A is inserted into the through hole 12C of the first presser foot 12, the through hole 13C of the first non-slip sheet 13, and the through hole 15C of the second non-slip sheet 15. Further, the tip of the male screw portion 16A is sharp, and the male screw portion 16A partially penetrates the sheet pallet 20.

The male screw portion 16A corresponds to the female screw portion 14C of the second presser foot 14. The traction member 16 is connected to the second presser foot 14 by the male screw portion 16A penetrating the through hole 12C formed in the first presser foot 12 and being inserted into the female screw portion 14C. Since the male screw portion 16A and the female screw portion 14C are screwed together, the traction member 16 can be attached to and detached from the second presser foot 14 by tightening or loosening the screw.

The ring portion 16B is provided on the other end (left end in FIG. 2) side of the traction member 16, and a hook 18 connected to an external traction power device 30 (see FIG. 5) is inserted into the opening of the ring portion 16B. ing. The structure for connecting the traction member 16 to the traction power device 30 is not limited to the combination of the ring portion 16B and the hook 18. For example, a hook-shaped portion may be provided on the traction member 16 side instead of the ring portion 16B, and a ring-shaped member corresponding to the hook-shaped portion may be provided on the traction power device 30 side.

Further, the traction member 16 side of the traction assist device 10 may be provided with a recess into which the hook 18 on the traction power device 30 side is inserted. Further, the connection structure that can be attached to and detached from the second presser foot 14 may be other than the combination of the ring portion 16B and the hook 18, for example, a member on the traction member 16 side and a member on the traction power device 30 side. May be fitted and connected to each other. The traction member 16 is removable from the traction power device 30.

<How to tow a seat pallet>
Next, a method of pulling the seat pallet using the pulling assist device 10 according to the present embodiment will be described with reference to FIGS. 3 to 6. In the present embodiment, as shown in FIG. 3, a case where the container yard Y is unloaded from the opening 24A of the container 24 transported by sea will be exemplified. On the floor surface G of the container 24, the first luggage 40A, the second luggage 40B, the third luggage 40C, and the fourth luggage 40D are placed via the corresponding sheet pallets 20A to 20D, respectively. There is.

The first luggage 40A is on the first seat pallet 20A, the second luggage 40B is on the second seat pallet 20B, and the third luggage 40C is on the third seat pallet 20C. , The fourth luggage 40D is placed on the fourth sheet pallet 20D, respectively. The first sheet pallet 20A, the second sheet pallet 20B, the third sheet pallet 20C, and the fourth sheet pallet 20D are equivalent to the sheet pallet 20 described in FIGS. 1 and 2.

(Installation step)
First, as shown in FIG. 4, the traction assist device 10 is placed inside the container 24 with the first retainer 12 and the end 22 of the first seat pallet 20A on which the first luggage 40A is mounted. The second presser foot 14 and the second presser foot 14 are overlapped with each other. Then, the towing member 16 (see FIG. 2) is inserted through the through hole 12C of the first pressing tool 12 and connected to the second pressing tool 14. At the time of insertion, a hole is made in the end portion 22 of the first seat pallet 20A by the sharp tip of the male screw portion 16A (see FIG. 2) of the traction member 16. It should be noted that the operator 26 of the forklift 28 (see FIG. 5) can get off the forklift 28 and carry out this mounting step by himself / herself.

(Consolidation step)
Next, as shown in FIG. 5, the operator 26 gets on the forklift 28 and operates the forklift 28 to bring the forklift pallet 32 inserted into the fork 28A close to the opening 24A of the container 24. Then, the operator 26 aligns the height with the upper surface of the forklift pallet 32 with the height of the floor surface G of the container 24. In this embodiment, the traction power unit 30 is arranged on the fork 28A. The arrangement position of the traction power device 30 is not limited to this, and can be appropriately changed, for example, on the roof of the operation room of the forklift 28. Further, a spacer 34 made of wood or the like is provided on the upper surface of the fork 28A on the root side (left side in FIG. 5).

Next, the operator 26 descends from the forklift 28, approaches the towing assist device 10 again, and inserts the hook 18 on the towing power device 30 side into the ring portion 16B (see FIG. 2) of the towing member 16. The hook 18 is connected to one end of the wire rope 36, and the other end of the wire rope 36 is connected to a traction power device 30 such as a winch.

(Towing step)
Next, as shown in FIG. 6, the operator 26 gets on the forklift 28 again, operates the traction power device 30, and pulls the first seat pallet 20A through the attached traction assist device 10. .. At the time of towing, in the towing assist device 10, the lower receiving surface 12B1 of the first presser foot 12 extending to the back surface of the end portion 22 of the first seat pallet 20A supports the back surface of the end portion 22. Further, the rising receiving surface 12A1 receives and supports the back surface of the rising portion of the end portion 22 of the bent first sheet pallet 20A. Further, the lower pressing surface 14B of the second pressing tool 14 presses the surface of the end portion 22 of the first sheet pallet 20A, and the standing pressing surface 14A presses the surface of the rising portion of the end portion 22 (see FIG. 2).

Then, as the traction progresses, the vertical pressing surface 14A of the second pressing tool 14 presses the rising portion of the end portion 22 of the bent first seat pallet 20A against the rising receiving surface 12A1 of the first pressing tool 12. .. Therefore, the end portion 22 of the first sheet pallet 20A does not fall out from between the first pressing tool 12 and the second pressing tool 14. Then, while the end portion 22 is held between the first presser foot 12 and the second presser foot 14, the first seat pallet 20 is integrated with the traction member 16 and is a traction power device. Move to the 30 side. Then, the first luggage 40A is pulled onto the forklift pallet 32 together with the first seat pallet 20A, and is unloaded from the container 24.

Since a gap of a certain length is secured between the first luggage 40A and the traction power device 30 by the spacer 34, it is possible to prevent the traction assist device 10 from colliding with the traction power device 30 during the pulling operation. Will be done. On the other hand, if the length of the spacer 34 (the length in the left-right direction in FIG. 6) is secured to a certain length, the length of the fork 28A for inserting into the forklift pallet 32 may be relatively short. If the length of the fork 28A is shortened, the forklift pallet 32 cannot be sufficiently supported, and there is a concern that the fork 28A sinks to the tip side and bends due to the weight of the first luggage 40A on the upper side. From the viewpoint of preventing the fork 28A from bending, a fork having a longer length can be used, or an extension cover can be attached to the tip of the fork 28A.

(Removal step)
Next, the operator 26 gets off the forklift 28, removes the hook 18 from the ring portion 16B of the towing member 16, and pulls out the towing member 16 from the first presser foot 12 and the second presser foot 14. The traction assist device 10 is removed from the seat pallet 20A. The removed traction assist device 10 may be temporarily placed on the floor surface G of the container 24, for example. Then, the operator 26 operates the forklift 28 to transport the first luggage 40A together with the first seat pallet 20A to a predetermined place. In the present embodiment, by using the first sheet pallet 20A, the luggage 40B together with the first sheet pallet 20A can be easily moved to a desired place.

Next, the operator 26 operates the forklift 28 to return to the container 24. Then, the temporarily placed traction assist device 10 is attached to the end portion of the second seat pallet 20B on which the second luggage 40B is mounted inside the container 24, as in the case of the mounting step described with reference to FIG. Attach to 22. Then, the operator 26 pulls the second seat pallet 20B via the towing assist device 10 by carrying out the connecting step and the towing step as in the case of the first seat pallet 20A, and the second luggage. 40B is lowered to the outside of the container 24.

Then, the operator 26 performs the removal step on the second sheet pallet 20B as in the case of the first sheet pallet 20A, as in the case of the first sheet pallet 20A. Then, a series of operations of the attachment step, the connection step, the towing step, and the removal step are also performed on the third seat pallet 20C on which the third luggage 40C is placed. Further, a series of operations are also performed on the fourth seat pallet 20D on which the fourth luggage 40D is placed.

As described above, by sequentially performing a series of operations of the mounting step, the connecting step, the towing step, and the removing step, the operator 26 alone can unload all the loads 40A to 40D inside the container 24. Since a worker other than the operator 26 is not indispensable, the personnel cost related to the work can be reduced. In the method of pulling the seat pallet according to the present embodiment, another worker carries out the work of attaching, connecting and removing the towing assist device 10, and the operator 26 carries out other work including the operation of the forklift 28. As such, it can be carried out by division of labor.

(Action effect)
In the towing assist device 10 of the seat pallet 20 according to the present embodiment, the end portion 22 of the seat pallet 20 is integrated with the towing member 16 without falling out from between the first pressing tool 12 and the second pressing tool 14 during towing. And move. Therefore, the heavy load 40 can be moved without using a push-pull attachment that requires a gripper that hydraulically holds the end 22 of the seat pallet 20. Therefore, the towing work of the sheet pallet 20 can be reliably performed, and the cost can be reduced.

Further, in the present embodiment, the traction member 16 is removable from the traction power device 30 and is also removable from the second presser foot 14. After moving the luggage 40 to a predetermined place, the towing member 16 is removed from the towing power device 30 and the second pressing tool 14, so that the first pressing tool 12, the second pressing tool 14, and the towing member 16 are next. Can be transported to the cargo handling work area. Therefore, the towing assist device 10 can be reused, and the running cost of the towing work can be suppressed. When the tow member 16 is relatively small with respect to the second presser foot 14, the tow member 16 is likely to be lost when the tow member 16 and the second presser foot 14 are disassembled. Therefore, when moving the towing assist device 10, if the towing member 16 and the second presser foot 14 are moved in an assembled state, the towing member 16 can be prevented from being lost.

Further, in the present embodiment, the second presser foot 14 is formed with a female screw portion 14C into which the male screw portion 16A of the traction member 16 is screwed. The tow member 16 is connected to the second presser foot 14 by screwing the male screw portion 16A of the tow member 16 that has penetrated the through hole 12C of the first presser foot 12 into the female screw portion 14C of the second presser foot 14. can do. Then, for example, by hooking the hook 18 attached to the wire to the ring of the towing member 16, the towing work can be smoothly prepared.

Further, in the present embodiment, the first non-slip sheet 13 is arranged between the first presser foot 12 and the end portion 22 of the sheet pallet 20, and the second presser foot 14 and the seat pallet 20 are located between the first presser foot and the seat pallet 20. 2 Non-slip sheet 15 is arranged. By sandwiching the first non-slip sheet 13 and the second non-slip sheet 15 between them, it is further suppressed that the sheet pallet 20 comes off.

Further, according to the method of pulling the seat pallet according to the present embodiment, after the first luggage 40A is unloaded, the towing assist device 10 is removed from the first seat pallet 20A. Therefore, the towing assist device 10 can be reused for unloading the next second luggage 40B, and the running cost of the towing work can be suppressed. Further, since the seat pallet towing method according to the present embodiment can be carried out by the operator 26 alone, it is advantageous in terms of personnel reduction, and the running cost can be further suppressed.

Further, consider the case where an obstacle projecting upward, such as the projecting portion G1 exemplified on the floor surface G in FIG. 2, exists in the middle of the traction path (transport path). Although not shown, the obstacle is not limited to the protruding portion G1 on the floor surface G, for example, a convex portion having a height of about 1 mm formed on the upper surface of the forklift pallet 32 (see FIG. 5). , Other forms may also exist. When the traction assisting device 10 moves along the traction direction D by the projecting portion G1 or the convex portion, a step is formed on the surface of the first pressing tool 12 in contact with the lower surface.

When the traction assist device 10 gets over the protrusion G1 on the floor surface G and the convex portion on the upper surface of the forklift pallet 32, the outer surface of the first presser foot 12 collides with the protrusion G1 and the convex portion, and the first presser tool 12 receives a reaction force that hinders its progress from the protruding portion G1 or the convex portion. Here, in the seat pallet traction assisting device 10 according to the present embodiment, as shown in FIG. 2, the lower portion of the outer surface of the connecting portion between the side wall portion 12A and the mounting portion 12B of the first presser foot 12 is formed. It is curved so that the gap between the outer surface and the floor surface G expands along the traction direction D. Therefore, according to the present embodiment, as compared with the case where the connecting portion is angular without being curved, the first pressing tool 12 is subjected to the reaction force received when the first pressing tool 12 collides with the protruding portion G1 or the convex portion. The progression is deflected upward along the curved slope, overcoming the protrusion G1 and the protrusion. As a result, the traction assist device 10 can continue to move without stopping due to a collision.

In addition, in order to reduce the reaction force received by the first presser foot 12, the traction power device 30 is arranged, for example, on the upper side of the mast of the forklift 28 or on the roof of the cabin, and as in Patent Document 1, the traction power device 30 is arranged. A method of widening the height difference between the 30 and the traction assist device 10 can be considered. By widening the height difference, it is possible to increase the inclination angle of the wire rope 36 with respect to the horizontal plane, so that a large gap is formed between the lower part of the first presser foot 12 and the floor surface G or the upper surface of the forklift pallet 32. It is possible to avoid a collision with an obstacle such as a convex portion existing on the floor surface G or the upper surface of the forklift pallet 32 to some extent.

However, when the traction power device 30 is arranged at a high position, the force required to pull the traction assist device 10 upward increases, so that the power consumption increases and the burden on the traction power device 30 also increases. That is, it becomes difficult to efficiently transmit the traction force to the traction assist device 10. Further, when the traction power device 30 is arranged on the upper side of the mast of the forklift 28, there is a concern that the mast tilts forward. Further, when the traction power device 30 is arranged on the roof of the cabin, in order to prevent the wire rope 36 from interfering with the mast, as disclosed in Japanese Patent Application Laid-Open No. 2002-173296, the wire rope 36 A member such as a pulley for adjusting the position is required, which complicates the overall configuration.

In the present embodiment, as shown in FIG. 5, the traction power device 30 and the traction assist device 10 are combined with each other to such an extent that the traction power device 30 and the traction assist device 10 can be regarded as having substantially the same height as each other. The height difference is suppressed. Therefore, the traction force can be efficiently transmitted to the traction assisting device 10, and it is possible to avoid the mast from tilting forward and the overall configuration from becoming complicated. Further, since the lower portion of the outer surface of the first presser foot 12 is curved, the traction assisting device 10 can get over the protruding portion G1 and the convex portion even if the output of the traction power device 30 is relatively small. Therefore, it is possible to reduce the size of the traction power device 30.

<First modification>
As shown in FIG. 7, the traction assist device 10A may be provided with a screw member 50 such as a bolt. The cross-sectional view of FIG. 7 is a cross-sectional view of the traction assisting device 10A in a vertical direction at a position different from that of FIG. 2 in the longitudinal direction of the traction assisting device 10A.

In the first modification, the first presser foot 12 is provided with a through hole 12D into which the screw member 50 is inserted at a position different from the through hole 12C into which the towing member 16 is inserted. The through hole 12D is inclined so as to extend from the lower side to the upper side from the outer wall surface on the left side of the side wall portion 12A in FIG. 7 toward the rising receiving surface 12A1 which is the inner wall surface.

Further, the first anti-slip sheet 13 and the second anti-slip sheet 15 are each provided with through holes (reference numerals omitted) at positions corresponding to the through holes 12D of the first presser foot 12. Further, the second presser foot 14 is provided with a female screw portion 14D at a position concentric with the through hole 12D of the first presser foot 12. The hole of the female screw portion 14D is inclined so as to be upward from the left side to the right side of the second presser foot 14 in FIG.

The screw member 50 is inserted into the through hole 12D of the first presser foot 12, the through hole of the first anti-slip sheet 13, and the through hole of the second anti-slip sheet 15. Further, the screw member 50 partially penetrates the seat pallet 20. Further, the screw member 50 is inserted into the female screw portion 14D and screw-coupled. That is, the screw member 50 is fastened from the first presser foot 12 to the second presser foot 14.

By the screw member 50, a corner portion formed by the standing pressing surface 14A and the lower pressing surface 14B of the second pressing tool 14 is formed at a corner formed by the rising receiving surface 12A1 and the lower receiving surface 12B1 of the first pressing tool 12. , Attracted. Since the other configurations of the traction assisting device 10A of the seat pallet 20 according to the first modification are equivalent to the members having the same name in the traction assisting device 10 shown in FIGS. 1 to 6, duplicate description will be omitted.

In the first modification, the corner portion of the second presser foot 14 bites into the corner portion of the first presser foot 12 and the end portion 22 of the seat pallet 20 is pressed, so that the seat pallet 20 is less likely to be displaced. Other effects of the traction assisting device 10A of the seat pallet 20 according to the first modification are the same as in the case of the traction assisting device 10 of the seat pallet 20 shown in FIGS. 1 to 6.

<Second modification>
As shown in FIG. 8, the traction assisting device 10B according to the second modification has side walls 52 provided at both ends of the first presser foot 12 and both ends of the second presser foot 14 provided on the side wall 52. 1 It has a support member 54 that supports the presser foot 12 so as to be detachable. The first non-slip sheet, the second non-slip sheet and the sheet pallet are not shown for the sake of clarity. Further, the lengths of the first presser foot 12 and the second presser foot 14 in the longitudinal direction are all substantially the same as the length along the end portion 22 of the sheet pallet 20.

The side wall 52 is provided with an elongated through hole 56 extending in the vertical direction, and a support member 54 such as a bolt can be inserted into the through hole 56. The tip of the shaft of the support member 54 is inserted into the fixing hole 58 provided in the second presser foot 14. The fixing hole 58 is provided with a female threaded portion, and the female threaded portion is connected to the male threaded portion of the support member 54.

In FIG. 8, only the front end of the first presser foot 12 and the second presser foot 14 is shown, and the back end is omitted, but the back side is also the front side. Similarly, a side wall 52, a support member 54, a through hole 56, and a fixing hole 58 are provided. The side wall 52, the support member 54, the through hole 56, and the fixing hole 58 may be provided on only one of both ends in the longitudinal direction. Other configurations of the traction assisting device 10B of the seat pallet 20 according to the second modification are equivalent to the members having the same name in the traction assisting devices 10 and 10A shown in FIGS. ..

In the second modification, since the side wall 52, the support member 54, the through hole 56, and the fixing hole 58 are provided at both ends of the first presser foot 12 and the second presser foot 14 in the longitudinal direction, the first presser foot 12 And the integrity of the second presser foot 14 is enhanced. Therefore, the traction assist device 10B is less likely to be lost. Other effects of the traction assisting device 10B of the seat pallet 20 according to the second modification are the same as those of the traction assisting devices 10 and 10A shown in FIGS. 1 to 7.

<Third modification example>
As shown in FIG. 9, the concave-convex shape may be used so that the rising receiving surface 12A2 of the first pressing tool 12 and the standing pressing surface 14A1 of the second pressing tool 14 are fitted. In the traction assisting device 10C according to the third modification, the rising receiving surface 12A2 is recessed toward the traction power device side (left side in FIG. 9), and the standing holding surface 14A1 is recessed in the rising receiving surface 12A2. Corresponding to, it bulges toward the traction power unit side (left side in FIG. 9).

In the third modification, the end portion 22 of the sheet pallet 20 is sandwiched between the rising receiving surface 12A2 and the standing holding surface 14A1 that are fitted to each other. The uneven shapes of the rising receiving surface 12A2 and the standing holding surface 14A1 corresponding to each other for fitting are not limited to those illustrated in FIG. 9, and can be changed as appropriate. For example, the rising receiving surface 12A2 swells to the seat pallet 20 side (right side in FIG. 9) opposite to the traction power unit 30, and the standing holding surface 14A1 is opposite to the rising receiving surface 12A2 (in FIG. 9). It may be dented on the right side of).

Further, in FIG. 9, the case where the concave-convex shape is one is illustrated, but two or more concave-convex shapes may be provided. Further, in FIG. 9, the concave-convex shape is composed of curved surfaces, but the present invention is not limited to this, and it is not excluded that the concave-convex shape includes an inclined surface. Other configurations of the traction assisting device 10C of the seat pallet 20 according to the third modification are equivalent to the members of the same name in the traction assisting devices 10, 10A and 10B shown in FIGS. Omit.

In the third modification, the rising receiving surface 12A2 and the standing holding surface 14A1 are fitted to each other using a concave-convex shape, so that the end portion 22 of the sheet pallet 20 can be more firmly sandwiched. Other effects of the traction assisting device 10C according to the third modification are the same as those of the traction assisting devices 10, 10A and 10B shown in FIGS. 1 to 8.

<Fourth modification>
As shown in FIG. 10, the first presser foot 12 has a plate-shaped ceiling portion 12E, and may be U-shaped in a side view or a cross-sectional view. Further, the second presser foot 64 may have a plate-shaped side wall portion 64A, a plate-shaped mounting portion 64B, and a plate-shaped ceiling portion 64D, and may have a U shape similar to that of the first presser foot tool 12. .. The wall surface on the left side of the side wall portion 64A in FIG. 10 is the vertical pressing surface 64A1, and the lower surface of the mounting portion 64B forms the lower pressing surface 64B1. When the presser foot is U-shaped in this way, there is an advantage that the strength is increased as compared with the L-shaped presser foot and it is difficult to bend.

The male threaded portion 16A at one end of the traction member 16 is inserted into the female threaded portion of the nut member 62 and screwed. In the traction assisting device 10D according to the fourth modification, between the first presser foot 12 and the second presser foot 64, in addition to the side wall portions 12A and 64A facing each other and the mounting portions 12B and 64B, the ceiling portion. The end portion 22 of the sheet pallet 20 is also sandwiched between the 12E and 64D. Further, in the fourth modification, at the end portion 12B2 of the mounting portion 12B in contact with the floor surface G of the first presser foot 12, the end portion is formed along the direction from the right side to the left side (traction direction D) in FIG. The lower part of the end face is curved so that the gap between the end face of 12B2 and the floor surface G is widened. Since the other configurations of the traction assisting device 10D according to the fourth modification are equivalent to the members having the same name in the traction assisting devices 10 and 10A to 10C shown in FIGS. 1 to 9, duplicate description will be omitted.

In the fourth modification, the end portion 22 of the sheet pallet 20 is sandwiched between the side wall portions 12A and 64A, the mounting portions 12B and 64B, and the ceiling portions 12E and 64D facing each other. The holding force can be further increased as compared with the case of the traction assisting device 10 illustrated in 1. Further, the lower portion of the end surface of the end portion 12B2 is curved so that the gap between the end surface of the end portion 12B2 of the mounting portion 12B and the floor surface G is widened. Therefore, when the traction assist device 10D gets over the protrusion G1 on the floor surface G and the protrusion on the upper surface of the forklift pallet 32, the protrusion G1 and the protrusion also on the end 12B2 located behind the towing direction D. The reaction force received when colliding with a part can be reduced. As a result, the traction assist device 10D can move more smoothly. Other effects of the traction assisting device 10D according to the fourth modification are the same as those of the traction assisting devices 10, 10A to 10C shown in FIGS. 1 to 9.

The ceiling portion 12E and the mounting portion 12B constituting the first presser foot 12 do not necessarily have to be parallel to each other, and may have a wedge shape such that the distance between the ceiling portion 12E and the mounting portion 12B narrows toward the side wall portion 12A. Further, in the second presser foot (which may or may not be U-shaped) fitted in the U shape of the first presser foot, the upper surface of the second presser foot facing the inner surface of the ceiling portion of the first presser foot. The lower surface of the second presser foot facing the mounting portion of the first presser foot does not necessarily have to be parallel, and may be, for example, a wedge shape having the same inclination as the wedge shape of the first presser foot.

When the U-shape of the first presser foot is made into a wedge shape in this way, the second presser foot is fitted into the U-shape of the first presser foot and pulled in with the sheet pallet sandwiched between them. 2 The seat pallet can be strongly tightened and firmly gripped at the portion where the corner of the tip surface of the presser foot contacts the inner surface of the first presser foot U-shape. Further, when the first presser foot and the second presser foot are made into a wedge shape having the same inclination, the first presser foot is first as the second presser foot is fitted and pulled in with the sheet pallet sandwiched between the first presser foot. The seat pallet can be strongly tightened and gripped by the inner surface of the ceiling portion of the presser foot, the upper surface of the second presser foot, the mounting portion of the first presser foot, and the lower surface of the second presser foot.

<Other Embodiments>
Although the present invention has been described by the disclosed embodiments described above, the statements and drawings that form part of this disclosure should not be understood as limiting the invention. For example, by combining the seat pallet 20 described in the present embodiment and the traction assisting device 10 according to the present embodiment, a seat pallet with a traction assisting device can be realized.

Further, in the present embodiment, the case where the sheet pallet 20 is wound from the lower side to the upper side of the second pressing tool 14 is exemplified, but as shown in FIG. 11, the sheet pallet 20 is the second pressing tool. It may be wound from the upper side to the lower side of 14. Further, in FIG. 11, when the second non-slip sheet 15A is arranged so as to cover the entire upper surface of the second presser foot 14 corresponding to the sheet pallet 20 wound from the upper side to the lower side. Is illustrated. Therefore, the contact area between the second non-slip sheet 15A and the sheet pallet 20 increases.

By winding the seat pallet 20 from the upper side to the lower side of the traction assisting device 10, the mounting portion 12B and the seat pallet 20 of the first presser foot 12 are compared with the case of the seat pallet 20 illustrated in FIG. A large gap S can be secured between the two. Therefore, when the traction assist device 10 moves along the traction direction D and the first presser foot 12 gets over the protrusion G1 on the floor surface G and the convex portion on the upper surface of the forklift pallet 32, the first presser foot 12 passes through the seat pallet 20. The force with which the mounting portion 12B is pushed downward can be reduced. As a result, the first presser foot 12 can easily get over the protruding portion G1 and the convex portion, and the traction assisting device 10 can move more smoothly.

<Fifth modification>
Further, as shown in FIG. 12, in the present invention, the notch 12F may be provided at a position corresponding to the male screw portion 16A of the traction member 16 on the side wall portion 12A of the first presser foot 12. That is, in the traction assisting device 10E according to the fifth modification, a notch 12F is provided in place of the through hole 12C provided in the side wall portion 12A of the first holding tool 12 of the traction assisting device 10 shown in FIG. ing. The male screw portion 16A is inserted into the notch 12F from above.

Further, the first non-slip sheet 13 and the second non-slip sheet 15 are also provided with notches (reference numerals omitted) at positions corresponding to the traction members 16. Further, a notch 23 cut by a cutting tool such as scissors or a cutter knife is formed at the end 22 of the sheet pallet 20, and a traction member 16 is inserted inside the notch 23. In the fifth modification, the traction member 16 can be inserted into and removed from the second pressing tool 14 by the notch 12F of the first pressing tool 12 and the notch 23 of the end portion 22 of the seat pallet 20. Therefore, the traction member 16 is detachably configured with respect to the second presser foot 14.

Further, on the outer surface of the side wall portion 12A of the first presser foot 12 in FIG. 12, reinforcing plate members 17 are joined to the left and right of the notch 12F by welding or the like. Here, when the notch 12F is formed in the first presser foot 12, the volume as a member decreases, so that the strength of the side wall portion 12A decreases, and when towing, the first presser foot is centered on the tow member 16. 12 may warp. However, the reinforcing plate member 17 can reinforce the decrease in strength of the side wall portion 12A due to the notch 12F. Since the other configurations of the traction assisting device 10E according to the fifth modification are equivalent to the members having the same name in the traction assisting devices 10 and 10A to 10D shown in FIGS. 1 to 11, duplicate description will be omitted.

When towing the luggage 40 using the towing assist device 10E according to the fifth modification, the operator 26 of the forklift 28 first cuts the end portion 22 of the seat pallet 20 using a cutting tool such as scissors or a cutter knife. And the notch 23 is formed. Then, as described with reference to FIGS. 4 to 6, the seat pallet 20 and the traction assisting device 10E are integrated, and the traction member 16 is inserted into the notch 23 to be connected to the traction assisting device 10E. Then, the wire rope 36 may be connected to the towing member 16 via the hook 18 to tow the luggage 40.

In the fifth modification, the screw connection between the male screw portion 16A of the traction member 16 and the female screw portion of the second presser foot 14 is not essential. For example, the end portion of the traction member 16 on the second presser foot 14 side. May be fixed to the second presser foot 14 at all times by welding or the like. The towing assist device 10E according to the fifth modification can also reliably execute the towing work of the seat pallet 20 and reduce the cost.

Further, in the fifth modification, the first presser foot 12 and the second presser foot are simply inserted into the notch 12F from the upper side of the notch 12F by inserting the male screw portion 16A of the towing member 16 fixed to the second presser foot 14. Since the tool 14 can be integrated, the work is easy. The notch 12F of the fifth modification is opened on the upper side, but the opening position of the notch is not limited to this, and may be opened on the lower side. Further, two or more traction members 16 may be provided on the first presser foot 12, and the state in which the first presser foot 12 warps around the traction member 16 can be suppressed as compared with the case of one. Further, the shape of the notch 12F of the fifth modification is U-shaped, but the shape is not limited to this, and can be appropriately changed, for example, V-shaped.

<6th modification>
In the case of the traction assisting device 10 illustrated in FIG. 1, the shape of the second presser foot 14 viewed from the side or the cross-sectional shape of the second presser foot 14 is square, and the lengths of each side of the square are substantially the same. Met. However, the present invention is not limited to this, and the shape of the second presser foot 14 can be changed as appropriate. For example, as shown in FIG. 13, in the case of the traction assist device 10F according to the sixth modification, the shape or cross-sectional shape seen from the side surface of the second presser foot 14 is the first presser foot 12 side (left side in FIG. 13). ) Is curved so that the radius of curvature of the lower corner is larger than the radius of curvature of the other corners. Further, in the sixth modification, the connecting portion between the side wall portion 12A and the mounting portion 12B of the first pressing tool 12 is also greatly curved according to the curved shape of the second pressing tool 14. Regarding the inner surface curvature of the corner of the first presser foot 12 and the outer surface curvature of the corner of the second presser foot 14, if there is no shape adhesion between the two presser footers, a gap will be created during towing when the seat pallet 20 is sandwiched. Since it is not desirable, it is desirable to match the degree of surface curvature at the facing portion of the two.

The first presser foot is formed by increasing the radius of curvature of the connecting portion between the side wall portion 12A and the mounting portion 12B of the first presser foot 12 and the lower corner portion of the second presser foot 14 on the first presser foot 12 side. The integrity of the tool 12 and the second presser foot 14 is improved. In particular, when the integrity at the time of towing is improved, for example, when a very heavy load such as several tons level is towed by using the towing assist device 10F, the weight of the load causes the second presser foot 14 to be generated in the longitudinal direction. Warpage can be suppressed. In other words, by improving the unity at the time of towing, the second presser foot 14 using a lightweight member such as aluminum is adopted to achieve both weight reduction and suppression of warpage of the second presser foot 14. It is also possible to make it.

Further, as the means for sandwiching (grasping) the sheet pallet, other than those described in the present embodiment can be appropriately adopted. For example, when the sheet pallet is made of a plastic material and has elasticity, a large number of small pieces on the surface of one or both of the first presser foot and the second presser foot so that the sheet pallet does not tear even if it bites into the sheet pallet. Protrusions or continuous rib projections may be provided. For example, when the presser foot is made of a plastic material around it and has a metal core material inside, the peripheral part can be manufactured by injection molding, so that the presser foot is smaller than the case where the presser foot is entirely made of metal. Shapes such as protrusions and rib protrusions can be freely formed.

Although the pressing force does not have to be so large between the pressing tools sandwiching the sheet pallet, if a certain amount of pressing force is applied, small protrusions or rib protrusions bite into the surface of the seat pallet. This bite can significantly prevent the seat pallet from slipping off the presser foot. In addition, a non-slip sheet is not required. That is, not only the frictional force of the first pressing tool and the second pressing tool can prevent slipping, but also the mechanical force of a protrusion such as a small protrusion or a rib protrusion can prevent slipping.

Regarding the mechanical force, in the traction assisting device 10C in FIG. 9 and the traction assisting device 10F in FIG. 13, a case where a convex portion and a concave portion are formed on the surfaces of the first pressing tool and the second pressing tool facing each other is exemplary. Explained to. The shape of the convex portion and the concave portion, the shape of the edge portion of the concave portion, the number of the convex portion and the concave portion to be installed, and the like can be appropriately changed. In addition, the effect of suppressing slippage can be appropriately adjusted by combining each shape, number, and the like.

Here, when the above-mentioned protrusions are made to bite into the pallet sheet, the life of the pallet sheet tends to be shortened due to repeated biting of the small protrusions or rib protrusions. On the other hand, when slippage is suppressed by gentle protrusions and recesses compared to small protrusions or rib protrusions,
The effect on the life of the pallet sheet can be reduced.

Further, for example, the first presser foot and the second presser foot may be sandwiched by using a presser foot pressing means connected via a spring such as a clothespin. When sandwiching the seat pallet between the first presser foot and the second presser foot, the spring is extended by hand to separate both the first presser foot and the second presser foot. Further, the presser foot is pressed against the seat pallet by the spring force just by releasing the hand while sandwiching the seat pallet, and the above-mentioned protrusions bite into the seat pallet. The pressing force is maintained by the pressing tool pressing means, and the sandwiched seat pallet does not fall off during towing. In addition, the first presser foot and the second presser foot are integrated and easy to handle, and can be prevented from being separated and lost.

Further, as another pressing tool pressing means, a magnet is attached to one of the first pressing tool and the second pressing tool, and a magnetic material such as an iron material attracted to the magnet is attached to the other pressing tool. May be good. Alternatively, a presser foot pressing means may be used in which magnets having opposite polarities are attached to both pressers. If the grip of the seat pallet is brought close to one of the pressers while the grip of the seat pallet is brought close to the other presser, both pressers are automatically pressed by the magnetic force, and the protrusions bite into the seat pallet and the pressing force is applied. The seat pallet that is maintained and sandwiched does not fall off during towing. Further, if the first presser foot and the second presser foot are magnetically attracted when not in use, they can be easily handled as one and can be prevented from being separated and lost.

In the pressing means using a magnet, it is also possible to use an electromagnet as the magnet instead of a permanent magnet. If the necessary power supply is connected, it is possible to switch the presence or absence of magnetic force by turning the switch on and off. Therefore, the operator does not need to arrange the presser foot at an appropriate position against the magnetic force, and only needs to turn on the switch after arranging the presser foot at an appropriate position, and the workability is improved.

Further, in both the spring type and the magnet type described above, the second presser foot used as the presser foot does not necessarily have to be continuous to the full width of the end portion of the seat pallet to be towed, and is appropriately divided. May be good. By dividing, the spring force provided for each of the divided pieces can be reduced, so that workability is improved and the procurement of spring materials and magnet materials becomes easy. However, in order to avoid the risk of tearing due to local force applied to the sheet pallet, it is preferable to design the shape so that the seat pallet is not excessively spaced.

Further, in both the spring type and the magnet type, it is the first presser foot provided with the traction portion that directly receives the traction force from the traction power unit. it can. Further, like the fork for meals, the first presser foot may be branched into a plurality of configurations. It is also possible to adopt a structure in which each region of the correspondingly divided second presser foot is attached to each branched tip with a spring or attracted with a magnet.

<7th modification>
Further, as a method of simply tightening with screws instead of springs or magnets, as shown in FIG. 14, a second pressing tool provided with a U-shaped (U-shaped) fixing tool 74B having a certain length in the longitudinal direction. 74 can be used. As shown in FIG. 15, the second presser foot 74 of the traction assist device 10G according to the seventh modification includes a presser foot portion 74A arranged inside the U-shape of the fixture 74B and a traction member 16 of the fixture 74B. A fixing bolt 74C inserted into the female screw hole 74B1 provided on the side side wall is provided. The fixing bolt 74C is provided with a handle 74C1.

The pressing portion 74A is, for example, a square cylinder made of metal and having a rectangular cross section. The square tube is advantageous in terms of both strength and weight reduction. The cross-sectional shape of the holding portion is not limited to a rectangular shape, and other polygonal shapes may be adopted. Further, the pressing portion is not limited to the square cylinder, and may be a plate-shaped member.

The fixture 74B is made of metal, for example, and the fixture 74B is provided with a through hole into which the traction member 16 is detachably inserted, although notation of reference numerals is omitted. Further, the fixing tool 74B of the second pressing tool 74 in the center in FIG. 14 is provided with a through hole 12C, and the towing member 16 is connected to the through hole 12C. Although the pressing portion 74A and the fixing tool 74B have been described as separate members, they may be integrally manufactured. Further, the materials of the pressing portion 74A and the fixture 74B are not limited to metal, and may be made of other materials such as resin. Further, the pressing portion 74A and the fixing tool 74B may be composed of a member in which a metal core material is coated with a resin.

The female screw hole 74B1 of the fixture 74B and the male screw portion of the fixing bolt 74C are screwed together. When the tip of the fixing bolt 74C advances from the traction member 16 side toward the first holding tool 12 side due to the rotation of the fixing bolt 74C, the tip presses the side wall portion 12A of the first holding tool 12. By pressing, the gap between the side wall portion 12A of the first pressing tool 12 and the pressing portion 74A of the second pressing tool 74 disappears, and the side wall portion 12A of the first pressing tool 12 and the pressing portion 74A of the second pressing tool 74 are formed. In close contact. Therefore, the vertical pressing surface 74A1 of the second pressing tool 74 presses the surface of the rising portion 22A of the end portion 22 of the seat pallet 20, and the seat pallet 20 arranged between the side wall portion 12A and the pressing portion 74A. The end portion 22 is firmly sandwiched by the traction assist device 10G. That is, the holding force of the seat pallet 20 can be adjusted by the fixing bolt 74C.

Further, in the seventh modification, since the handle 74C1 is provided on the fixing bolt 74C, the operator can easily pinch the handle 74C1 to rotate the fixing bolt 74C, and attach the fixing tool 74B to the first holding tool 12. The burden of removal work becomes easier. The handle 74C1 is not indispensable, and as the fixing bolt 74C, a cap bolt or the like, or a bolt having another shape, or the like can be appropriately adopted.

Further, since the pressing portion 74A is relatively lightweight, when the end portion 22 of the seat pallet 20 is sandwiched between the traction assisting devices 10G, for example, the first pressing tool 12, the end portion 22 of the seat pallet 20, and the pressing portion 74A are moved. , It becomes easy for the operator to hold the pallet integrally with one hand. Then, with the other hand, the operator puts the fixing bolt 74B in the state where the fixing bolt 74C is inserted into the female screw hole 74B1, and the concave portion inside the U-shape of the fixing tool 74B is the first holding tool 12 and the seat pallet 20. It is put on from the upper side of the first presser foot 12 so as to fit the end portion 22 and the presser foot portion 74A. Then, the operator can rotate the fixing bolt 74C with the other hand while the first pressing tool 12 and the second pressing tool 74 are in the fitted state. Therefore, as shown in FIG. 15, it becomes easy to realize a state in which the upper end of the end portion 22 is aligned with the upper end of the first presser foot 12 over the entire longitudinal direction.

The method of tightening only with screws is not limited to the case of the seventh modification, and other than that, the side surface of the first pressing tool 12 on the traction member 16 side (left side in FIG. 15) and the second pressing tool. The side surface of the 74 on the luggage side (right side in FIG. 15) may be penetrated and fixed with one or more screws. The U-shaped presser is configured so that the distance between both sides can be freely changed by screws, and the U-shaped presser is used as the first presser with the sheet pallet sandwiched between the first presser and the second presser. Cover from the top of the second retainer and tighten the screws so that the distance between both sides is narrowed. The seat pallet can be firmly sandwiched (grasped) between the first presser foot and the second presser foot by the screw-tightened U-shaped presser foot.

When using the U-shaped presser foot, the work can be facilitated by covering the U-shaped presser tool from above. However, it does not exclude covering from the bottom. The width and number of U-shaped pressers are arbitrary, but as shown in Fixture 74B in FIG. 14, for example, three U-shaped pressers are prepared, and at three locations on the center and both sides of the traction assist device. Tightening is desirable from the standpoint of stability. Further, the towing member may be attached to a U-shaped pressing tool arranged at the center to be towed, or may be attached to a first pressing tool to be towed.

Further, the present invention may be configured by partially combining the configurations included in the traction assisting devices 10, 10A to 10G of the respective seat pallets shown in FIGS. 1 to 15. The present invention includes various embodiments not described above, and the technical scope of the present invention is defined only by the matters specifying the invention within the scope of claims reasonable from the above description.

10,10A-10G Towing assist device 12 1st presser foot 12A1, 12A2 Standing receiving surface 12B1 Lower receiving surface 12C Through hole 13 1st non-slip sheet 14 2nd presser foot 14A, 14A1 Standing pressing surface 14B Lower pressing surface 14C Female Threaded parts 15, 15A Second non-slip sheet 16 Towing member 16A Male screw part 16B Ring part 20, 20A to 20D Seat pallet 22 End part 22A Raising part 22B Base part 24 Container 40, 40A to 40D Luggage 50 Screw member 52 Side wall 54 Support member 64A1 Standing presser surface 64B1 Lower presser foot surface 74A Second presser foot 74A1 Standing presser surface

Claims (9)

The portion of the end of the seat pallet where the luggage is not placed faces the rising receiving surface that receives the back surface of the rising portion that is bent upward, and the rising receiving surface that faces the floor surface of the end of the seat pallet. A first presser foot with a lower receiving surface that sneaks under the back surface and extends.
A second presser foot having a standing presser surface that is superposed on the first presser foot with the end portion of the sheet pallet in between and presses the surface of the rising portion of the end portion of the sheet pallet.
A towing member connected to the second presser foot and
Seat pallet traction assist device with. The traction member is removable from the traction power unit.
The traction assist device for a seat pallet according to claim 1. A male screw portion is formed at one end of the towing member, and a ring portion is provided at the other end.
The second presser foot is formed with a female screw portion into which the male screw portion of the traction member is screwed.
The traction assist device for a seat pallet according to claim 2. A non-slip sheet is arranged between the first presser foot and the end of the sheet pallet, or between the second presser foot and the end of the sheet pallet.
The traction assist device for a seat pallet according to any one of claims 1 to 3. The second presser foot includes a lower presser surface that presses the surface of the base portion of the end portion of the sheet pallet.
A screw member that attracts the corner portion formed by the standing pressing surface and the lower pressing surface of the second pressing tool to the corner formed by the rising receiving surface and the lower receiving surface of the first pressing tool. It is fastened from the first presser foot to the second presser foot.
The traction assist device for a seat pallet according to any one of claims 1 to 4. The first presser foot and the second presser foot have a length equal to the width along the end portion of the seat pallet in the towing direction.
It has side walls provided at both ends of the first presser foot, and support members provided on the side wall and supporting both ends of the second presser foot so as to be detachable from the first presser foot.
The traction assist device for a seat pallet according to any one of claims 1 to 5. The second presser foot is a U-shaped fixture having a recess for fitting the first presser foot and the end portion of the seat pallet, and a female screw provided on the side wall of the fixture on the traction member side. With fixing bolts inserted into the holes,
The traction assist device for a seat pallet according to any one of claims 1 to 4. Sheet pallet and
A second receiving surface that receives the back surface of the raised portion of the end portion of the folded sheet pallet and a lower receiving surface that extends from the rising receiving surface to the back surface of the end portion of the sheet pallet. 1 presser foot and
A second presser foot having a standing presser surface that is superposed on the first presser foot with the end portion of the sheet pallet in between and presses the surface of the rising portion of the end portion of the sheet pallet.
A towing member connected to the second presser foot and
Seat pallet with traction assist device. A step of attaching the traction assist device for the seat pallet according to any one of claims 2 to 7 to the end of the first seat pallet on which the first load is loaded inside the container.
A step of pulling the first seat pallet through the attached traction assist device and unloading the first load to the outside of the container.
The step of removing the traction assisting device from the first seat pallet,
The step of attaching the removed traction assist device to the end of the second seat pallet on which the second load is loaded inside the container, and
A step of pulling the second seat pallet through the towing assist device and lowering the second load to the outside of the container.
How to tow a seat pallet, including.

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