Lockset and pallet loading bin having same

Provided are a lockset and a pallet loading bin having the same. A lock hole is arranged at the pallet loading bin. The lockset comprises a lock bar and a handle. A first end of the lock bar is provided with a hook member for fitting the lock hole to realize locking. A connection portion is provided at the lock bar. The lock bar is rotatably connected, through the connection portion, to a bin body of the pallet loading bin. Rotation of the lock bar around the connection portion in a plane parallel to an outer surface of the bin body causes the hook member to extend into or retract from the lock hole, thereby realizing locking or unlocking of the lockset. The handle comprises a connection end. The handle is rotatably connected, through the connection end, to a second end of the lock bar opposite to the first end of the lock bar. Rotation of the handle around the connection end causes the handle to be positioned close to or away from the outer surface of the bin body. The lockset has a simple structure and low costs, can be processed and manufactured easily, can be operated flexibly with less effort, and adapts to the small thicknesses of an end wall and a side wall of a pallet loading bin.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 371 U.S. National Phase of International Application No. PCT/CN2018/079471, filed Mar. 19, 2018, which claims priority to Chinese Patent Application No. 201710193903.X, filed Mar. 28, 2017. The entire disclosures of the above applications are incorporated herein by reference.

TECHNICAL FIELD

The present invention generally relates to the technical field of container transportation, and more specifically to a lockset and a box pallet having the same.

BACKGROUND

In order to facilitate the loading and unloading of cargos and the stacking transport of empty box pallet, the end and side walls of the box pallet are usually set in a detachable or foldable form. The end wall of the box pallet needs to be provided with a lockset connected with an adjacent side wall stand column to lock the adjacent end wall and side wall together so as to keep them relatively fixed when loading cargoes.

As shown inFIG.1, an existing box pallet lockset is provided. When the lockset needs to be unlocked, a stopper113′ is firstly moved upward to be completely separated from a lock hook111′, and an operator rotates the handle112′ downward so that the lock hook111′ is separated from a side wall stand column21′, and at this time, there is no link constraint of the lockset between the end wall and the side wall, and the end wall and the side wall can be disassembled or folded. At present, the use of the lockset has limitation because the handle112′ has to be held by a single hand during the process of rotation, which then has a requirement for the operating space (a vertical distance between the outer surface of the end wall plate10′ and the inner side of the handle112′). However, since the lockset should be located within the vertical distance (i.e., the thickness of the end wall) between the outer surface of the end wall panel10′ and the outer surface of the end wall stand column11′, that is, the lockset cannot extend beyond the outer surface of the end wall stand column11′ and the distance from the inner side of the handle112′ to the outer surface of the end wall plate10′ must ensure that the fingers could normally stick into so as to hold the handle112′, thus, when the thickness of the end wall is small, the vertical distance between the outer surface of the end wall plate10′ and the inner side of the handle112′ is too small for fingers to normally stick into, this lockset is no longer suitable for such a box pallet. In addition, a separately arranged stopper113′ needs to be provided for such a lockset, thereby leading to a complicated structure and requiring two-hand operation during operation, i.e. moves the stopper113′ with one hand, and rotates the handle112′ with the other hand, which is inconvenient to operate.

In order to increase the volume of the box pallet and reduce the height of the box pallet after being folded, thereby increasing the loading capacity of the box pallet and the transportation amount of empty boxes, and reducing the logistics transportation cost, the thickness of the end and side walls of the existing box pallet are currently designed to be as small as possible, which is not applicable to the lockset of the prior art.

Therefore, a lockset and a box pallet having the same need to be provided to at least partially solve the above problem.

SUMMARY

In order to at least partially solve the above problem, the present invention provides a lockset for a box pallet, on which a lock hole corresponding to the lockset is provided, the lockset comprises:

a lock bar, a first end of which being provided with a hook head matched with the lock hole to realize locking, the lock bar being provided with a connection portion, wherein the lock bar is rotatably connected to a body of the box pallet through the connection portion, and as the lock bar rotates around the connection portion in a plane parallel to an outer surface of the body, the hook head extends into or retracts from the lock hole to realize locking or unlocking of the lockset; and

a handle, which comprises a connection end, wherein the handle is rotatably connected to a second end of the lock bar opposite to the first end through the connection end, and as the handle rotates around the connection end, a position of the handle changes between positions that are close to or far away from an adjacent outer surface of the body.

Optionally, a lock seat is further comprised; the lock seat is fixedly connected to the body; and the lock bar is rotatably connected to the lock seat through the connection portion.

Optionally, the lock seat is provided with a reinforcing plate, and the lock bar is rotatably connected to the reinforcing plate through the connection portion.

Optionally, a support portion is further comprised so that when the lockset is in an unlocked state, the handle is supported by the support portion.

Optionally, a limiting portion is further comprised so that when the lockset is in a locked state, the handle is fixed by the limiting portion.

Optionally, the second end of the lock bar is provided with a U-shaped groove; an opening of the U-shaped groove faces away from the box pallet; the connection end of the handle is inserted into the U-shaped groove and connected via a connecting shaft passing through two side walls of the U-shaped groove; and the handle is rotatable around the connecting shaft.

Optionally, one end of the U-shaped groove away from the handle is enclosed to increase strength.

Optionally, one side of the end portion of the connection end facing a bottom wall of the U-shaped groove is provided with a first inclined surface to prevent the connection end from interfering with the bottom wall of the U-shaped groove when the handle is rotated.

Optionally, a torsion spring is further comprised, and the torsion spring has a first force bearing end and a second force bearing end, wherein the torsion spring is sleeved on the connecting shaft; the first force bearing end abuts against a bottom wall of the U-shaped groove, and the second force bearing end abuts against the handle so that the handle abuts against the body under an elastic force of the torsion spring.

Optionally, the connection end of the handle is provided with a groove; the connecting shaft penetrates through the groove; and the torsion spring is arranged in the groove.

Optionally, the handle is provided with a limiting groove in a position corresponding to the second force bearing end of the torsion spring so as to limit the torsion spring.

Optionally, the connection end of the handle is provided with a U-shaped opening; the second end of the lock bar is inserted into the U-shaped opening and connected via a connecting shaft passing through two side walls of the U-shaped opening using a connecting shaft; and the handle is rotatable around the connecting shaft.

Optionally, a thickness of a portion of the handle away from the connection end is less than a thickness of the connection end, so that a sufficient distance is kept between the portion of the handle away from the connection end and the outer surface of the body.

Optionally, the first end of the lock bar is provided with a stop portion, and an extension direction of the stop portion is opposite to an extension direction of the hook head, wherein when the lockset is in a locked state, a tail end of the stop portion is close to or abuts against a side wall of the lock hole.

Optionally, the tail end of the stop portion is provided with a chamfer to prevent the stop portion from interfering with the side wall of the lock hole.

Optionally, when the handle is parallel to the hook head, the handle is opposite to the hook head in an extension direction.

According to another aspect of the present invention, a box pallet is provided, wherein the box pallet comprises any of the locksets as described above.

The lockset according to the present invention has a simple structure and low costs, can be processed and manufactured easily, can be operated flexibly with less effort, and can adapt to the situation of small thicknesses of an end wall and a side wall of a box pallet.

DETAILED DESCRIPTION

In the following descriptions, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it is obvious to the skilled in this art that the present invention may be implemented without one or more of these details. Some technical features well-known in this art are not described in other examples so as to avoid confusion with the embodiment of present invention.

The present invention discloses a lockset for box pallet, which is used for connecting an end wall and a side wall of a box pallet, and is particularly suitable for the end wall structure with a small distance between the outer surface of the end wall plate and the outer surface of the end wall stand column.

As shown inFIGS.2-4, a lockset100according to a preferred embodiment of the present invention is provided, and the lockset100mainly comprises a lock bar120and a handle110.

One end of the lock bar120is provided with a hook head121which is perpendicular to the lock bar120and extends outwards from the lock bar120; a lock hole is provided on the box pallet at a position corresponding to the mounting position of the lockset100; and the lockset100realizes the locking of the box pallet through the cooperation of the hook head121and the lock hole. The middle of the lock bar120is provided with a shaft hole122, and the plane where the shaft hole122is located is parallel to the plane where the lock bar120and the hook head121are located. As shown inFIG.8, the lock bar120can be mounted on the outer surface of the box pallet by a positioning shaft140, for example, passing through the shaft hole122, so that the lock bar120can rotate around the positioning shaft140, and with the rotation of the lock bar120, the hook head121extends into or retracts from the lock hole. Preferably, on the premise of ensuring the connecting strength, the positioning shaft140can be detachably connected by a threaded connection or a pin, etc., in order to facilitate the maintenance or replacement of the lockset100. It should be understood that the shaft hole122may also be directly disposed in the form of a shaft integrally formed with the lock bar120and perpendicular to the plane where the lock bar120and the hook head121are located. That is to say, as long as the lock bar120can rotate around the connection portion connected to the box pallet in a plane parallel to the outer surface of the box pallet, the present invention does not limit the specific structural form of the lock bar120connected to the box pallet.

A handle mounting portion123is provided on the second end of the lock bar120opposite to the hook head121. The handle110is mounted to the lock bar120through the handle mounting portion123, and is rotatable around the handle mounting portion123, so that when the lockset100is mounted to the box pallet, with the rotation of the handle110around the handle mounting portion123, the angle between the handle110and the outer surface of the box pallet changes within a predetermined range. Specifically, as shown inFIGS.2and3, the handle mounting portion123is a U-shaped groove. As shown inFIG.8, the U-shaped groove is arranged such that when the lockset100is mounted to the box pallet, the opening of the U-shaped groove faces away from the box pallet. Two through holes124, which are symmetrical with each other, are respectively disposed on two side walls of the U-shaped groove, and as shown inFIG.4, the connection end111of the handle110is also provided with mounting holes115at corresponding positions. When connected, the connection end111of the handle110is inserted from the opening of the U-shaped groove, and the handle110is connected with the lock bar120by cooperation of a connecting shaft127with the through holes124and the mounting holes115. In this way, the handle110can rotate around the connecting shaft127. Preferably, the connecting shaft127can employ a detachable form such as a threaded connection or a pin, etc., in order to facilitate the maintenance of the lockset100and the replacement of components. When the handle110is parallel to the hook head121, the handle110extends in an opposite direction with that of the hook head121, which facilitates the operation of the lockset100. Further preferably, one end of the U-shaped groove away from the handle110is provided with a closed side126, which can increase the strength of the handle mounting portion123.

As shown inFIG.4, the handle110is substantially in an elongated shape, and has a connection end111and an operation end117. To facilitate operation, the thickness of the operation end117is smaller than that of the connection end111, so that when the handle110is close to the box pallet, there is a certain operating space between the inner side surface of the operation end117and the outer surface of the box pallet for the fingers to stick into to lift the handle, in order to further hold the handle110. It should be understood that the handle110may also be set as an arc shape having a predetermined radian along the length direction thereof, and the arc shape protrudes in a direction away from the box pallet, or the handle110may also adopt other structures capable of ensuring that there has sufficient operation space between the inner side of the handle110and the outer surface of the box pallet.

A groove portion112, penetrating the handle110in the thickness direction thereof, is disposed at the connection end111of the handle110, wherein the mounting holes115are located on two side walls of the groove portion112along the length direction of the handle110, that is, when the handle110is mounted to the lock bar120, the connecting shaft127passes through the groove portion112. Preferably, a torsion spring130is sleeved on the connecting shaft127and is located in the groove portion112. As shown inFIG.5, the torsion spring130has a first force bearing end131and a second force bearing end132. When installed, the first force bearing end131of the torsion spring130abuts against a surface of the bottom wall125of the handle mounting portion123which faces towards the handle110, and the second force bearing end132abuts against the side of the handle110away from the bottom wall125. In this way, when the lockset100is mounted to the box pallet, the torsion spring130applies a force on the handle110to make the handle110have a tendency to abut against the outer surface of the box pallet, and to prevent the handle110from freely rotating around the connecting shaft127to be protruded out of the outmost surface of the box pallet, avoiding collision or damage or accidental unlocking of the lockset by bumps in the cargo transportation process of the box pallet.

Preferably, a limiting groove113is provided in a position on the handle110where the second force bearing end132abuts, and the second force bearing end132is located in the limiting groove113, which can keep the position of the torsion spring130fixed and prevent the torsion spring130from moving up and down along the axial direction of the connecting shaft127. Further preferably, an escape groove114is provided in a side face of the handle110facing the bottom wall125, and the position of escape groove114is corresponding to the first force bearing end131of the torsion spring130, so that when the handle110rotates around the connecting shaft127, the first force bearing end131enters the space of the escape groove114to prevent the connection end111from interfering with the first force bearing end131to affect the rotation of the handle110.

Due to the groove portion112, there is certainly a distance between the mounting hole115and the end portion of the connection end111. In this way, under the condition that the thickness of the handle mounting portion123is limited, when the handle110is rotated, the end portion of the connection end111would interfere with the bottom wall125of the handle mounting portion123, thereby affecting the rotation of the handle110. Therefore, a first inclined surface116is provided on a side face of the end portion of the connection end111facing toward the bottom wall125, and as shown inFIG.6, an angle F is formed between the first inclined surface116and the bottom wall125. Thus, the first inclined surface116enables the handle110to rotate around the connecting shaft127by a maximum angle of about F, as shown inFIG.7.

As shown inFIGS.8to9, the lockset100is mounted to the end wall panel10of the box pallet close to the end wall stand column11via a lock seat150. A reinforcing plate190is further provided at the mounting position of the lockset100on the lock seat150to increase the strength. As shown inFIG.10, an elongated hole12, which is corresponding to the hook head121of the lockset100, is provided on and penetrates through the end wall stand column11. As shown inFIG.11, a lock hole22is provided on the side wall of the side wall stand column21facing the end wall stand column11at a position corresponding to the elongated hole12. When the lockset100is to be locked, the handle110is operated to rotate the lock bar120around the positioning shaft140, and the hook head121moves towards the end wall stand column11and penetrates through the elongated hole12into the lock hole22, and lock bar120is further rotated so that the upper surface128of the hook head121hooks the side wall of the side wall stand column21facing the end wall stand column11, so as to prevent the side wall of the box pallet from moving outward in the horizontal direction, as shown inFIG.9, thus achieving the locking of the lockset100. Then, the handle110is operated to rotate around the connecting shaft127to abut against the outer surface of the end wall panel10.

Preferably, a stop portion129is provided on one end of the lock bar120where the hook head121is provided. The stop portion129extents in a direction opposite to the extension direction of the hook head121, and the length and the position of the stop portion129are set in advance so that when the lockset100is locked, the lower end of the stop portion129is abutted against or close to the lower side wall of the lock hole22. Further preferably, the length of the lock hole22is set in advance so that the side of the lock bar120connected with the hook head121abuts against the upper side wall of the lock hole22, that is, the distance A between the tail end of the stop portion129and the side of the lock bar120connected with the hook head121is equal to or slightly smaller than the length B of the lock hole22, thereby preventing the side wall from moving up and down and making the locking firmer. Preferably, a chamfer intersecting with the lower side of the stop portion129is provided on the tail end of the stop portion129, which may avoid the interference between the stop portion129and the lower side wall of the lock hole22in the locking and loosening movement process.

Preferably, a first limiting portion151and a second limiting portion152are disposed on the lock seat150at a position corresponding to the handle110when the lockset100is locked; the first limiting portion151and the second limiting portion152fix the handle110to keep the lockset100in a locked state, and to keep the handle110in a state of abutting against the end wall plate10, so as to prevent the handle110from rotating around the connecting shaft127to be protruded out of the outer surface of the end wall plate10resulting in unlocking or damage caused by collision. The first limiting portion151and the second limiting portion152can be fixedly connected to the lock seat150in a manner such as welding, and can also be integrally formed with the lock seat150.

On the side of the first limiting portion151facing the handle110, a hemispherical protrusion portion153as shown inFIG.12may be provided, and the distance between the vertex of the protrusion portion153and the corresponding surface of the second limiting portion152is slightly smaller than the width of the handle110at the position corresponding to the protrusion portion153. In this way, when the lockset100is locked, the handle110is restrained between the protrusion portion153and the outer surface of the end wall plate10, and since the distance between the vertex of the protrusion portion153and the corresponding surface of the second limiting portion152is slightly smaller than the width of the handle110at the position corresponding to the protrusion portion153, the handle110remains in the state of being restrained and cannot be freely separated out. Preferably, on both sides of the handle110at a position corresponding to the protrusion portion153, a first guiding surface118and a second guiding surface119are provided, which specifically can be an arc-shaped surface or an inclined surface, and thus by the cooperation of the first guiding surface118and the second guiding surface119with the protrusion portion153, it is convenient to restrain the handle and relieve restraint on the handle110.

When the lockset100is in an unlocked state, the handle110being subjected to the force of gravity may cause the lockset100to have a tendency to rotate around the positioning shaft140toward the locked position, and thus a support portion154is provided on the lock seat150to support the handle110in an unlocked state, so as to prevent the lockset100from being automatically rotated and locked under the driving of the handle110. The support portion154can be fixedly connected to the lock seat150in a manner such as welding, and can also be integrally formed with the lock seat150. Preferably, the position of the support portion154can correspond to the positions of the first guiding surface118and the second guiding surface119.

Preferably, as shown inFIGS.17and18, the lock seat150′ is integrally formed with the support portion154′, the first limiting portion151′ and the second limiting portion152′, and the support portion154′ has a elongated structure, which protrudes out of the surface of the lock seat150′ and extends to the second limiting portion152′. In the embodiment shown inFIGS.8and9, during the unlocking of the lockset100, an operator may misplace the handle110in a space between the second limiting portion152and the support portion154, so that the lockset100is in an incomplete unlocking state, and the hook head121cannot be completely retracted into the inner space of the end wall stand column11, and at this time, if the box pallet is folded, the most front end of the hook head121may scratch the side wall, and the folding of the box pallet cannot be completed. According to this embodiment, the handle110needs to be lifted by an operator to the support portion154′, and only in this way, it could be placed close to the outer surface of the box pallet; otherwise, the handle110may be in a supporting state away from the outer surface of the box pallet due to the support portion154′, which can serve as a warning and reminder. In this way, the incomplete unlocking state of the lockset100can be avoided. According to the embodiment, the lock seat is integrally formed with the support portion, the first limiting portion and the second limiting portion, and such a structure is simple in manufacturing, low in cost, good in strength, and beautiful in appearance, and is a preferred embodiment.

It should be pointed out that the purpose of providing the lock seat and the reinforcing plate is to increase the strength of the box pallet, and prevent the body of the box pallet from being damaged due to excessive force on the lockset when the lockset is locked. On the premise of ensuring the strength, the lockset may be mounted directly to the outer surface of the box pallet without providing a reinforcing plate or even without a lock seat. At this time, the limiting portion and the support portion can be directly connected to the outer surface of the box pallet.

According to the lockset100shown in the present invention, the locking process is as below:

As shown inFIG.8, the lockset100is in an unlocking state. When locking is required, the operator sticks his/her fingers into the inner side of the handle110, and pushes the handle110upwards, so that the lockset100rotates around the positioning shaft140and the handle extends beyond the top edge of the support portion154, and then lifts the handle110toward the outside of the box so that the handle110can overcome the force of the second force bearing end132of the torsion spring130applied on the handle110, and rotate around the connecting shaft127to a maximum angle F (at the moment, the intersection ridge between the most front end surface of the connection end111of the handle110and the first inclined surface116is in contact with the bottom wall125of the U-shaped groove of the handle mounting portion123, as shown inFIG.7). The handle110is then held down to rotate the lock bar120around the positioning shaft140; the hook head121penetrates through the elongated hole12in the end wall stand column11firstly, and then penetrates through a lock hole22in the side wall of the side wall stand column21towards the end wall stand column11; the upper surface128of the hook head121hooks the inner side of the side wall of the lock hole22; the lower end of the stop portion129is abutted against or close to the lower side wall of the lock hole22; and the side of the lock bar120connected with the hook head121abuts against the upper side wall of the lock hole22(such that the locking force point of the hook head121is as close as possible to the axial center plane of the positioning shaft140, which may reduce the torque generated by the locking force of the hook head121on the positioning shaft140, thereby reducing the pressure on the handle110in a locked state exerted by the second limiting portion152since the handle110has to resist the torque, and improving the locking force of the lockset).

After the lock bar120is locked, the handle110faces an area between the first limiting portion151and the second limiting portion152. The handle110is pushed in the direction towards the end wall plate10. Firstly, the second guiding surface119of the handle110is in contact with the protrusion portion153, and meanwhile another side of the handle110is in contact with the vertical edge of the second limiting portion152; the handle110is pushed by force so that the protrusion portion153crosses the second guiding surface119and is located outside the first guiding surface118to block the first guiding surface118and fix the handle110. At this time, the inner side of the handle110is attached to the end wall plate10; the protrusion portion153ensures that the handle110cannot freely rotate outside the box; the torsion spring130further enables the handle110to be tightly attached to the end wall plate10to prevent the handle110from rotating out of the box and prevent the handle110from protruding out of the body; the first limiting portion151and the second limiting portion152can also ensure that the handle110cannot swing left and right. This completes the locking of the end wall and side wall of the box pallet by the lockset100.

The unlocking process of the lockset100shown in the present invention is as below:

As shown inFIG.9, the lockset100is in a locked state. An operator lifts the handle110by his/her fingers, and a gap is preferably reserved between the first guiding surface118and the protrusion portion153, so that the fingers can stick into the space between the handle110and the end wall plate10to facilitate the application of force, and only the force of the torsion spring130needs to be overcome during this period. The handle110continues to be lifted toward the outside of the box. At this time, the first guiding surface118is in contact with the protrusion portion153, and the force of the torsion spring130and the resistance of the protrusion portion153should be overcome at the same time; the handle is lifted to a maximum angle F to be separated from the protrusion portion153and the second limiting portion152. The handle110is then held to rotate upward; the lock bar120rotates around the positioning shaft140; the most front section of the hook head121separates from the side wall stand column21and retracts into the inner space of the end wall stand column11; and at the moment, the end wall completely separates from the side wall. The handle110is then hung on the support portion154for fixation to ensure that the handle110would not rotate downward around the positioning shaft140due to gravity, which otherwise would cause the lock bar120protrude out of the end wall stand column11and further affect the folding and assembly of the end wall, or lock the end and side walls again. In this way, the lockset completes unlocking. After unlocking, the box pallet can be folded or disassembled.

As shown inFIGS.13and14, a lockset200according to a second embodiment of the present invention is provided.

The structure of the lockset200is substantially same as that of the lockset100, except that the connection end211of the handle210is not provided with a groove portion as that of the handle110, and no torsion spring is mounted. The handle210does not need to overcome the acting force of the torsion spring during the lifting process; when the lockset200is in a locked state, there is no action force on the handle210given by the torsion spring, and the handle210is only restrained by cooperation of the first limiting portion251and the second limiting portion252from rotating toward outside of the box so as to achieve the effect of limiting and fixing.

The lockset200according to the second embodiment has the same operation mode as the lockset100according to the first embodiment, which is not repeated here.

As shown inFIGS.15and16, a lockset300according to a third embodiment of the present invention is provided.

The lockset300differs from the lockset100and the lockset200in that the handle mounting portion323of the lock bar320is T-shaped; the vertical wall of the T-shape corresponds to the two side walls of the U-shaped groove; the connection end311of the handle310is provided with a U-shaped opening; the vertical wall of the T-shape is inserted into the U-shaped opening of the handle310and they are connected together by the connecting shaft327.

When the lockset300is in a locked state, the hook head321is downward; the hook head321is perpendicular to the handle310; and the handle310is fixed by the first limiting portion351and the second limiting portion352. When the lockset300is to be unlocked, the handle310is first lifted by about angle F to disengage from the constraints of the first limiting portion351and the second limiting portion352; the handle310is rotated downward, and the lock bar320rotates around the positioning shaft340until the hook head321retracts into the end wall stand column31; at this time, the handle310naturally droops under its own gravity, and is substantially parallel to the end wall stand column31.

The lockset according to the third embodiment is simple in structure; the support portion is omitted, and the operation is labor-saving. However, when the lockset is in a locked state, the reliability of fixing of the handle is not as good as that in the first and second embodiments. In the same case where the torsion spring is not provided, the reliability of fixing of the handle is not as good as that in the second embodiment. When the lockset is in an unlocked state, the handle is not restrained by other force except for its own gravity, so that the handle would swing around due to the external force, and its stability is not as good as that in the first and second embodiments; the hook head may rotate around the positioning shaft due to the external force, so that the hook head extends out of the end wall stand column and blocks the assembly or folding of the end wall.

According to another aspect of the present invention, a box pallet is provided, and the box pallet comprises any of the locksets described above.

The box pallet lockset according to the present invention has a simple structure and low costs, can be processed and manufactured easily, can be operated flexibly with less effort, and can adapt to the situation of small thicknesses of an end wall and a side wall of a box pallet.

The present invention has been described by way of the above embodiments, but it is to be understood that the above-described embodiments are for illustrative and explanatory purposes only and are not intended to limit the invention to the scope of the described embodiments. In addition, it will be understood by those skilled in the art that various modifications and variations can be made in accordance with the teachings of the present invention, which fall within the scope of the invention as claimed. The protection scope of the present invention is defined by the appended claims and its equivalent scope.