JPH09295792A - Cargo handling bucket of bottom opening type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify locking and unlocking an operation lever by constituting the operation lever handle to be capable of being set to either upright or horizontal position and setting it to either an attitude for engaging with a detent member on a main body side or an attitude for non-interference. SOLUTION: A handle 6b is attached to be vertically swingable within a range of about 90 degrees through a joint 6a to the top of an operation lever 6. The joint 6a joins through a pin 6c the lower end of the handle 6b to be freely swingable so that the handle 6b may be set to either an upright attitude aligned with the axial direction of the operation lever 6 or a horizontally tilted attitude. The tilting direction of the handle 6b is the one to project outward from a main body 1. A detent member 8 is disposed to project from the side wall of the main body 1 for engaging with the handle 6b in its upright attitude and for non-interference with the handle 6b in its horizontal attitude. The detent member 8 is positioned to restrain the operation lever 6 by means of a spring 7 as the lower end of the handle 6b strikes it when the operation lever 6 is swung.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bottom opening type cargo handling bucket used for cargo handling of scraps and the like.

[0002]

2. Description of the Related Art Conventionally, cargo handling work such as scrap metal is
The idea was to put scrap in a bucket, hang it with a crane, carry it, and temporarily put it in a predetermined place. In such work, it is necessary to tilt the bucket when discharging the metal scrap, which is a problem that the burden on the operator is heavy.

Instead of such a tilting type bucket, the ones proposed by the applicant of the present application and published as Japanese Utility Model Publication No. 4-27912, Japanese Utility Model Publication 5-40062 and Japanese Utility Model Publication No. 6-28542 are disclosed. is there. These are automatic bottom opening buckets having a structure capable of opening and closing the bottom plate without requiring manual labor and capable of safe cargo handling without slinging work for tilting.

These buckets have a structure in which a bottom plate is provided at the bottom of a box-shaped main body so that the bottom plate can be opened and closed, and a bottom plate lock holding mechanism is provided. Then, the closed state is maintained by the hook at the lower end of the operation lever that engages with the engagement pin provided on the bottom plate, and when the operation lever is rotated by the urging force of the tension spring, the engagement pin is released from the constraint and the bottom plate is released. The bottom plate is opened by the load applied to it.

Further, a pair of lock plates are provided on the side walls of the main body, a lock rod held by a spring that can be fitted into the holes of these lock plates is provided, and one end is pivotally supported on the side wall of the main body and the other is used as the lock rod. By providing the lock mechanism provided with the released release lever, the bottom plate is prevented from opening when the bucket is transported except when it is discharged.

In Japanese Utility Model Publication No. 6-28542, a mechanism for releasing the lock of the operating lever to open the bottom plate of the bucket and maintaining the released state is provided on the other side wall of the main body. It has a structure in which such a bar is fitted into the hole of the released release lever. In addition, real fairness 4
No. 27912 and Jpn. Pat. Appln. KOKAI No. 5-40062, an engaging rod is integrally provided at a lower end portion of a lock rod, a groove is provided at an intermediate portion of the engaging rod, and a moving rod is inserted into the groove. When a restraint device is provided and the release lever is pushed down, the engaging rod descends while contacting the mover,
When the groove reaches the position of the moving element, the moving element enters the groove by the biasing force of the spring.

[0007]

SUMMARY OF THE INVENTION
In No. 28542, the mechanism for maintaining the released state is a system in which the bar is fitted in the hole of the release lever, and therefore the release lever and the bar penetrated by the lock rod must be operated at the same time. For this reason, it is necessary to perform the work for locking with both hands, and the operation is considerably complicated.

On the other hand, in Japanese Utility Model Publication No. 4-27912 and Japanese Utility Model Publication No. 5-40062, the lock can be released only by pushing down the release lever, and when returning to the locked state, only the operation of rotating the operation lever is required. Therefore, the work of locking and releasing the lock is much simpler than that of the Japanese Utility Model Publication No. 6-28542.

However, since the lock mechanism has many movable parts, it is necessary to synchronize the operation of the operation lever and the lock rod restraint device with the ascent of the lock rod so that the lock hole and the lock plate hole are substantially aligned. There is a problem in that the manufacturing cost of the bucket increases as well as the accuracy.

Further, the one disclosed in Japanese Utility Model Publication No. 5-40062 has two bottom plates which can be opened and closed, and each of these bottom plates is connected to an operation lever by a link mechanism. . For this reason, the number of members for composing the link mechanism increases, the structure becomes complicated, and frequent lubrication work is required to maintain a quick opening / closing operation, and maintenance and inspection are troublesome. is there.

The problem to be solved by the present invention is to provide a cargo handling bucket which simplifies the lock mechanism of the operating lever and does not require strict precision setting during manufacturing, and which can open and close a single-opening or double-opening type bottom plate with a simple operation. To provide.

[0012]

According to the present invention, there is provided a bottom plate which is pivotably attached to a lower portion of a main body and a hook which engages a pin provided on the bottom plate, and an operation for holding the bottom plate in a closed state. In a bottom opening cargo handling bucket having a lever, a lock mechanism for restraining the operation lever in a state where the pin and the hook are engaged with each other, and a means for urging the operation lever in a direction in which the engagement between the pin and the hook is released. The lock mechanism includes a handle provided on an upper end portion of the operation lever and capable of undulating in a direction orthogonal to a rotation direction thereof, and a locking member provided on a side wall of the main body, and the handle is the hook. At the position where the pin and the pin are engaged with each other, the pin can be locked by the locking member in a state of being rotatably erected in a direction parallel to the longitudinal direction of the operation lever.

The lock mechanism includes a locking unit which is provided on a side wall of the main body and which holds an always projecting state, and a release lever which temporarily releases the projecting state of the engaging head to forcibly retract. It can also be composed of a stopper provided on the operation lever that locks the engagement head of the lock unit at the position where the hook and the pin engage.

Further, the lock mechanism includes an engagement head which is provided on the upper portion of the operation lever and which always keeps the protruding state toward the main body side, and a release lever which temporarily releases the protruding state of the engaging head to forcibly retract. And a locking member provided on the side wall of the main body so that the engaging head can be locked at the position where the operation lever engages the hook and the pin.

Further, the bottom plate can be a single piece that covers the entire lower end opening of the main body, or can be a double piece that covers the entire lower end opening of the main body in a posture in which they are arranged so as to face each other. . In the case of a two-piece bottom plate, the abutting ends may be vertically overlapped with each other, and the upper bottom plate end may be supported by the lower bottom plate end.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The operating lever can be easily locked or unlocked by setting the handle of the operating lever so that it can be raised and lowered so as to engage with the locking member on the main body side or not to interfere with it. be able to. Even when the lock unit and its locking member are provided on either the main body side or the operation lever side, the lock unit can be locked simply by turning the operation lever to the lock position. The lock can be released by operating the release lever.

Even if the bottom plate is one or two, if the hooks and the pins are engaged with each other between the main body and these bottom plates, the bottom plate can be locked or unlocked by the operating lever. It will be possible. When the bottom plates of two pieces are stacked, the abutting ends of the bottom plates overlap each other, and when only the bottom plate of the lower side is closed with hooks, the bottom plate ends of the upper side are arranged in the lower side. It is supported by the bottom plate edge of and is maintained in a closed position.

[0018]

FIG. 1 is a perspective view of a bottom opening cargo handling bucket showing an embodiment of the present invention, FIG. 2 is a front view of essential parts, FIG. 3 is a right side view of FIG. 2, and FIG. 4 is a circle in FIG. It is an enlarged view of the part enclosed by A.

In the figure, a trunnion 1a for hanging a rope for hanging slings and the like is provided on the upper end of a body 1 of a cargo handling bucket having an open upper end, and a single bottom-opening bottom plate 2 is provided on the lower end. Is attached to open and close freely. The bottom plate 2 has its base end connected to the main body 1 by a pivot 2b, and has a pin 2 protruding laterally at both ends in the width direction on the tip side.
a is provided.

A support shaft 3 is rotatably attached to the lower end of the main body 1 at a position substantially above the pin 2a when the bottom plate 2 is in a closed posture as shown in FIG. This support shaft 3
Is a little longer than the entire length of the main body 1 in the width direction (the direction of arrow P in FIG. 1), and a pair of hooks 4 and 5 engaging with a portion protruding laterally from the main body 1 are fixed to the support shaft 3. It is possible to rotate integrally. These hooks 4 and 5 are the bottom plate 2
By holding it in the pin 2a of
The bottom plate 2 is restrained in a closed posture with respect to the main body 1.

As in the conventional bottom-opening bucket, when the hooks 4 and 5 are hooked on the pins 2a to close the bottom plate 2, the main body 1 is pulled up from the work floor surface and the bottom plate 2 floats from the floor surface. In this case, as shown in FIG. 1, a small gap G is formed between the lower end surface of the main body 1 and the upper end surface of the bottom plate 2.

On the side surface of the main body 1 on the side where the hook 4 is provided,
An operation lever 6 for locking or releasing the hooks 4 and 5 with respect to the pin 2a is arranged, and its base end is integrally fixed to the support shaft 3. This operation lever 6 is, as shown in FIG.
A beam 1b provided on the outer periphery of the main body 1 is connected by a pulling spring 7 and is urged in the direction of the arrow shown in the figure.

A handle 6b is attached to the upper end of the operating lever 6 through a joint 6a so as to be rotatable by approximately 90 ° in the vertical direction. As shown in FIG. 4, the joint 6a is formed by rotatably connecting the lower end of the handle 6b via a pin 6c.
Can be set to a standing posture that coincides with the axial direction of the operating lever 6 as shown by the chain double-dashed line in the figure, and a horizontally tilted posture as shown by the solid line. Handle 6b
As shown in FIG. 3, the direction of inclining is a direction that projects outward from the main body 1.

On the other hand, on the side wall of the main body 1, when the handle 6b is in an upright posture, it engages with it, and when the handle 6b is in a horizontal posture, a locking member 8 which does not interfere with this is projected to the side. Set up. The locking member 8 is made of L-shaped steel as shown in FIG. 2, and is a position where the lower end of the handle 6b abuts when the operating lever 6 is rotated by the spring 7 and can be restrained in the posture of FIG. It is located in.

In the above construction, after the scrap or the like is transported and temporarily placed at a predetermined place, the operation of opening the bottom plate 2 is performed. In this case, as will be described later, the operating lever 6 is in the position of the posture shown by the chain double-dashed line in FIG. 2, and its posture is restrained by the spring 7.
Then, when the main body 1 is transported to the scrap collection site by a crane and then landed on the work floor surface side, the tip end of the bottom plate 2 that is still open begins to hit the work floor surface, and thereafter, the main body 1 descends. At the same time, the bottom plate 2 is rotated to a posture in which the bottom surface side of the main body 1 is closed as shown in FIG.

Next, as shown in FIGS. 3 and 4, the handle 6b which is in an upright position in FIG. 2 is brought into a horizontally tilted position, and the handle is moved in the direction shown by the solid line from the position of the chain double-dashed line in the drawing. The operator grips 6b and turns the operation lever 6. At this time, the handle 6b moves under the locking member 8 on the main body 1 side without interfering with the locking member 8 on the main body 1 side by rotating the operating lever 6, and when the handle 6b is raised again after this, as shown in FIG. The operation lever 6 urged in the direction of the arrow by 7 is locked by being locked in a posture in which the handle 6b is abutted against the locking member 8.

After the operation lever 6 has been locked, scrap is put into the main body 1, and when the throwing is finished, a sling rope (not shown) is hung on the trunnion 1a and the bottom plate 2 is slightly lifted from the work floor surface. Stop as a state. Then, the handle 6b abutting on the locking member 8 is released in the posture in which the handle 6b is tilted as shown in FIGS. 3 and 4. As a result, the operating lever 6 is free from the locking member 8 and is biased by the spring 7 in the direction of the arrow in FIG.

On the other hand, scrap is put into the main body 1 and the bottom plate 2 receives its weight. Therefore, the bottom plate 2
A large load including the weight of scrap and the like is applied from the pin 2a to the hooks 4 and 5, and a large frictional force acts between these pins 2a and the hooks 4 and 5. If the relation is set such that the moment for turning the operation lever 6 in the clockwise direction in FIG. 2 by the spring 7 is smaller than the force for stopping the operation lever 6 due to this frictional force. , The operating lever 6 cannot be rotated by the spring 7, and the operating lever 6
The hooks 4 and 5 remain held in the posture shown in FIG. That is, even if the locking of the operation lever 6 by the locking member 8 is released, the hooks 4 and 5 are still engaged with the pin 2a, and the bottom plate 2 can be conveyed while the scrap is stored without opening.

When the bottom plate 2 is placed on a loading platform such as a truck after the main body 1 is lifted up by a crane and conveyed, the main body 1 comes into direct contact with the bottom plate 2 and the main body 1 and the bottom plate shown in FIG. There is no gap G between the two. Then, the lower end peripheral surface side of the pin 2a forms a gap between the hooks 4 and 5 in correspondence with the size of the gap G, whereby contact between the pin 2a and the hooks 4 and 5 is eliminated. . Therefore, the frictional force held between the pin 2a and the hooks 4 and 5 disappears, and the operation lever 6 integrated with the hooks 4 and 5 via the support shaft 3 becomes free, The urging force of the spring 7 causes the spring 7 to rotate until the posture indicated by the chain double-dashed line in FIG.

By thus landing the bottom plate 2, the operating lever 6 can be set in a posture in which the hooks 4 and 5 are separated from the pin 2a, and the constraint on the bottom plate 2 is released. After that, when the main body 1 is lifted by a crane or the like, the bottom plate 2 rotates around the pivot 2b side accordingly, and the bottom of the main body 1 can be opened to discharge the scrap.

After this discharge, the procedure opposite to the above procedure is performed to close the bottom plate 2 and then the operation lever 6 is locked to return it to the original position. Therefore, scraps and the like can be automatically discharged, and there is no need for the worker to stand by at the scrap or the like disposal position to work.

FIG. 5 shows another example, in which two reinforcing ribs 11a are provided on the opposing peripheral walls of the main body 11,
Sliding holes 1 for slinging on the upper ends of these reinforcing ribs 11a.
1b is opened, and two bottom plates 12 and 13 having base ends connected to the reinforcing ribs 11a are attached to the lower end of the main body 11 so as to be openable and closable.

One bottom plate 12 is connected to the reinforcing rib 11a by the pivot 11c, and the other bottom plate 13 is also connected to the reinforcing rib 11a on the other side by the same structure.
Then, as in the previous example, the pins 12a are protruded laterally on both side surfaces on the tip side of the bottom plate 12, and the pressure receiving surfaces 12b inclined downward are formed at the tips, and the other bottom plate 1 is formed.
The mounting surface 13a formed on the lower surface of the tip of the pressure receiving surface 1
By supporting the pressure with 2b, these two bottom plates 12 and 13 can be simultaneously opened and closed.

A support shaft 14 is rotatably attached to each of the opposing side walls of the main body 11 not provided with the reinforcing rib 11a, and the support shafts 14 are attached to the pins 12a of the bottom plate 12 in the same manner as in the previous example. Hooks 15 that can be engaged with each other are fixed, and an operating lever 16 is integrally connected to these hooks 15.

When the bottom plates 12 and 13 are closed, the hook 15 and the pin 12a come into contact with each other only when the bottom plates 12 and 13 are floating from the work floor so that frictional forces act on each other. It is exactly the same as in the previous example that there is a gap between 12 and 13 when they land.

The two operating levers 16 have a length that slightly protrudes from the connecting point with the support shaft 14 beyond the side wall of the main body 11 having the reinforcing rib 11a, and the protruding parts are connected to each other by the rod 17. There is.

A stopper 18 formed as a vertically long rectangular frame is fixed to the rod 17, and a lower end of the stopper 18 is connected to a tension spring 19 having a base end connected to a side wall of the main body 11. And the main body 11
A lock unit 20 is provided on the side wall of the lock unit 20 that can be engaged with and disengaged from the frame-shaped stopper 18.

The lock unit 20 is a latch-type lock used in buildings and the like, and normally, the lower surface of the engaging head 20a protruding from the main body of the lock unit 20 is directed upward toward the tip side. The mechanism has a mechanism in which the engaging head 20a is forcibly pushed into the main body side when the upper end of the stopper 18 abuts on the arc surface and rises. Further, by providing the release lever 20b for moving the engaging head 20a to the main body side and storing the engaging head 20a, the engaging head 20a that has entered the frame of the stopper 18 can be released.

A guide hole 11a-for allowing the rod 17 to pass through the reinforcing rib 11a and to move in the vertical direction.
Open one. The guide hole 11a-1 has an upper end that allows the stopper 18 to move beyond the upper surface of the engaging head 20a of the lock unit 20, and a lower end of which the hook 15 has a pin 12a.
The length in the vertical direction is such that the stroke of the rod 17 can be ensured so that the rod 17 can be rotated until it is sufficiently separated from.

The reference numeral 25 in the figure denotes the bottom plate 12,
It is an opening stop portion that prevents 13 from opening too much.

The operation of the cargo handling bucket shown in FIG. 5 is almost the same as the previous example, and will be briefly described below.

When the bottom plates 12 and 13 are open and landing, the bottom plate 13 precedes the one bottom plate 12 and closes the main body 11 side. For this purpose, the lower end of the bottom plate 13 when it is opened is positioned lower than the other bottom plate 12, or the mounting surface 13a
It suffices to provide a roller on the side, and by such an operation, the mounting surface 13a of the bottom plate 13 is placed on the upper side, and the pressure receiving surface 12b of the bottom plate 12 can be closed while receiving the mounting surface 13a and overlapping. .

Next, the spring 1 is moved to the position of the chain double-dashed line.
When the rod 17 pushed down by 9 is moved upward, the hook 15 also integrally rotates and engages with the pin 12a, whereby the bottom plates 12 and 13 are restrained in the closed position. . Then, as the rod 17 rises, the stopper 18 causes the engagement head 20 of the lock unit 20 to move.
While moving "a" into the main body, the engaging head 20a is inserted into the frame of the stopper 18 when the engaging head 20a is removed by the latch mechanism as shown in FIG. As a result, the rod 17 becomes the stopper 1
It is locked to the lock unit 20 via 8 and the closure of the bottom plates 12 and 13 by the hook 15 is maintained.

After the scrap is charged and the main body 11 is slightly lifted by the crane, the engagement head 20a is forcibly moved to the main body side by the release lever 20b of the lock unit 20, thereby releasing the engagement with the stopper 18. At this time, as in the previous example, by utilizing the frictional force between the hook 15 and the pin 12a due to a load load such as scrap, the bottom plates 12 and 13 are closed while the hook 15 remains in the posture shown by the solid line in the figure. Maintained in the specified state.

Then, the bottom plates 12 and 13 are attached to the truck bed.
When landing, the main body 11 and the bottom plate 12, like the previous example,
By having a structure in which a gap is provided between the hook 15 and the pin 13, the frictional relationship between the hook 15 and the pin 12a is eliminated when landing. Therefore, the spring 19 causes the rod 1
7 is pulled down to the position of the chain double-dashed line, the hook 15 is also separated from the pin 12a, and the restraint of the hook 15 on the bottom plate 12 is released. Then, when the main body 11 is pulled up from the loading platform, the bottom plates 12 and 13 are automatically opened and the scrap is discharged.

FIG. 6 is a front view of a main part showing an example in which the lock by the engagement between the handle 6b of the operating lever 6 and the locking member 8 is changed to a latch mechanism in the example shown in FIGS. 7
FIG. 7 is an enlarged view of a portion surrounded by a circle B in FIG. It should be noted that common members are designated by the same reference numerals as those used in FIGS.

A lock unit 21 is attached to the upper end of the operating lever 6, and an engaging head 21 provided on the lock unit 21.
A can be engaged with and disengaged from a locking member 22 provided on the side wall of the main body 1. The engaging head 21a has its tip formed into an arcuate surface inclined in the direction of rotation of the operating lever 6 so that the operating lever 6 is engaged when the operating lever 6 is changed from the solid line posture in FIG. The head 21a can be engaged with the locking member 22. In addition, the engaging head 21a is attached to the locking member 22.
By providing a rotary handle 21b for disengaging the lock member 22, the lock with respect to the locking member 22 can be released. A stopper 1c that engages with the upper end portion of the operation lever 6 is provided on the side wall of the main body 1 to prevent the operation lever 6 from being overloaded by the biasing force of the spring 7 when the lock is released so that the operation lever 6 can be stably held. To do.

The lock unit 21 and the locking member 2 as described above
Even when the number 2 is provided, the operation of the operation lever 6 is the same as in the previous example, and scraps and the like can be automatically collected and discarded without the operator opening and closing the bottom plate 2.

[0049]

According to the present invention, the operator can easily lock or unlock the operating lever by means of the retractable handle provided on the operating lever, the lock unit or the lock unit provided on the main body. Significantly reduced.

Further, since the lock mechanism is not the conventional system of inserting the rod into the hole of the lock plate, but the structure is such that the operation rod which is elastically biased is movable in the rotation direction, the lock mechanism is locked. Such movement of the operation rod can be utilized as an adjustment allowance, and can be favorably operated without stricter processing and assembling accuracy of members. Therefore, it is easy to manufacture and assemble parts,
The manufacturing cost can be reduced.

Further, even if the type of the bottom plate of the cargo handling bucket is single-opening or double-opening, any locking device can be applied. In the double-opening type bottom-opening bucket, one bottom plate end can support the other bottom plate end. A complicated link mechanism as in the conventional example is unnecessary, and maintenance and inspection is easy.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a cargo handling bucket according to an embodiment of the present invention.

FIG. 2 is a front view showing a main part of a bucket.

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is an enlarged view of a portion surrounded by a circle A in FIG.

FIG. 5 is a perspective view showing an example of a bucket including two bottom plates.

FIG. 6 is a front view of essential parts showing an example in which a latch-type lock unit is provided on the upper end of the operation lever.

FIG. 7 is an enlarged view of a portion surrounded by a circle B in FIG. 6 viewed from a side surface.

[Explanation of symbols]

 1: Main body 2: Bottom plate 2a: Pin 2b: Axis 3: Support shaft 4: Hook 5: Hook 6: Operating lever 6a: Joint 6b: Handle 6c: Pin 7: Spring 8: Locking member 11: Main body 12: Bottom plate 12b : Pressure receiving surface 13: Bottom plate 13a: Mounting surface 14: Spindle 15: Hook 16: Operating lever 17: Rod 18: Stopper 19: Spring 20: Lock unit 20a: Engaging head 20b: Release lever 21: Lock unit 21a: Engaging head 21b: Handle 22: Locking member 25: Opening prevention part

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[Procedure amendment]

[Submission date] June 28, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

[Figure 3]

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

[Figure 5]

Claims (6)

[Claims] 1. A bottom plate rotatably and pivotally attached to a lower portion of a main body, a hook for engaging a pin provided on the bottom plate, an operation lever for holding the bottom plate in a closed state, and the pin and the hook. In a bottom opening cargo handling bucket having a lock mechanism for restraining the operation lever in an engaged state, and a means for urging the operation lever in a direction to release the engagement between the pin and the hook, At the position where the handle and the pin engage with each other, the handle is provided on the upper end of the lever and can be undulated in the direction orthogonal to the rotation direction of the lever, and the locking member provided on the side wall of the main body. A bottom opening cargo handling bucket, wherein the bottom opening cargo handling bucket can be locked to the locking member in a state of being rotationally erected so as to be parallel to a longitudinal direction of the operation lever. 2. A bottom plate rotatably and pivotally attached to a lower portion of the main body, a hook for engaging a pin provided on the bottom plate, an operation lever for holding the bottom plate in a closed state, and the pin and the hook. In a bottom opening cargo handling bucket having a lock mechanism for restraining the operation lever in an engaged state, and a means for urging the operation lever in a direction to release the engagement between the pin and the hook, the lock mechanism includes the main body. The hook and the pin are engaged with each other, and the lock unit is provided on the side wall of the lock head, which holds the projection state at all times, and the release lever that temporarily releases the projection state of the engagement head and forcibly retracts the locking head. A bottom opening cargo handling bucket comprising: a stopper provided on the operation lever for locking the engagement head of the lock unit at a position. 3. A bottom plate rotatably and pivotally attached to a lower part of the main body, a hook for engaging a pin provided on the bottom plate, an operation lever for holding the bottom plate in a closed state, and the pin and the hook. In a bottom opening cargo handling bucket having a lock mechanism for restraining the operation lever in an engaged state, and a means for urging the operation lever in a direction to release the engagement between the pin and the hook, A lock unit including an engagement head provided on an upper portion of the lever for constantly maintaining a protruding state toward the main body side, and a release lever for temporarily releasing the protruding state of the engaging head to forcibly withdraw, and the operating lever. Is a locking member provided on a side wall of the main body so that the engaging head can be locked at a position where the hook and the pin are engaged with each other. 4. A bottom opening cargo handling bucket, wherein the bottom plate is a single piece that covers the entire area of the lower end opening of the main body. 5. A bottom opening cargo handling bucket, characterized in that the bottom plates are two objects that are arranged so as to face each other and cover the entire area of the lower end opening of the main body in a posture in which they face each other. 6. The bottom according to claim 5, wherein the abutting ends of the bottom plates of the two pieces are vertically overlapped with each other, and the upper bottom plate end can be supported by the lower bottom plate end. Open cargo bucket.