JP2020183631A - bucket - Google Patents

Abstract

To provide a bucket capable of coping with large capacity with a simple structure.SOLUTION: A bucket according to the present invention is a bucket 1 that is lifted by means of lifting means such as a crane and transports a contained object by moving the lifting means and comprises: a bucket body 2 having an opening part 24 at an upper part and having a storage space for a storage object inside; a gate shaped suspension arm 3 rotatably attached at both ends to both sides of the bucket body 2; and a lock structure 5 for releasably fixing a state in which the suspension arm 3 is tilted backward by a prescribed angle from a state in which it is erected to the bucket body 2.SELECTED DRAWING: Figure 8

Description

The present invention relates to a bucket for lifting and transporting concrete, earth and sand, residual soil, rubble, and the like.

When placing concrete in civil engineering work and construction work, a method of using a bucket (concrete bucket) is known in addition to a method of using a concrete pump truck. In this method, for example, concrete supplied from a concrete mixer is received by a bucket, lifted by a crane, transported to a concrete casting site, and the concrete in the bucket is discharged there.

Generally, this type of bucket has a structure in which the lower half is conical and a discharge port called a gate is provided at the lower end of the conical shape (Patent Document 1). Therefore, the inside of the bucket has a tapered shape toward the gate side, and when the gate is opened, the concrete is discharged to the outside by free fall due to its gravity.

Japanese Unexamined Patent Publication No. 2006-169825 JP-A-2018-95453

However, since the gate of the conventional bucket is narrow, it cannot be said that the concrete discharge property is good, and the problem of the discharge property becomes remarkable when the bucket capacity is increased. Further, when the capacity of the bucket is increased, there is a problem that the opening and closing of the gate needs to be automated as described in Patent Document 2 from the viewpoint of operability and safety, and the structure becomes complicated.

Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a bucket that can cope with a large capacity with a simple structure.

The bucket according to the present invention
A bucket that is lifted by a lifting means such as a crane and transports the contents by moving the hanging means.
A bucket body with an opening at the top and a storage space for the contents inside,
A gate-shaped hanging arm with both ends rotatably attached to both sides of the bucket body,
It is a bucket equipped with a lock structure for fixing the hanging arm so that it can be released from a state in which it is tilted backward by a predetermined angle from a state in which it stands up against the bucket body.

Here, as one aspect of the bucket according to the present invention,
The lock structure is
A pair of lock members that move in and out of each frame on the left and right of the hanging arm,
A lever that can be rotatably attached to the bucket body,
It is provided with a link mechanism that is operatively connected to a pair of lock members and a lever, and by switching the lever between a first rotation position and a second rotation position, the pair of lock members move in and out in synchronization. The configuration can be adopted.

In addition, as another aspect of the bucket according to the present invention,
It is possible to adopt a configuration in which the front side portion of the bottom portion of the bucket body is formed in a curved surface shape that is separated from the ground contact surface of the bottom portion toward the front side.

Further, as another aspect of the bucket according to the present invention,
It is possible to adopt a configuration in which the suspension arm is further provided with a lock structure for fixing the standing state to the bucket body so that it can be released.

Further, as yet another aspect of the bucket according to the present invention,
Both ends of the suspension arm can be attached at positions deviated from the center of gravity within a region having a predetermined radius centered on the center of gravity of the bucket body in a state where the maximum amount of contained matter is accommodated.

As described above, according to the bucket according to the present invention, it is possible to cope with an increase in capacity with a simple structure.

FIG. 1 is a side view of a bucket according to an embodiment of the present invention. FIG. 2 is a front view of the bucket. FIG. 3 is a rear view of the bucket. FIG. 4 is a side view of the bucket with the suspension arm tilted backward. FIG. 5 is an enlarged perspective view of a main part of the bucket, and is an explanatory view of a lock structure for fixing the hanging arm in an upright state. FIG. 6 is an explanatory view regarding a mounting position of the suspension arm. FIG. 7 is an enlarged rear view of a main part of the bucket, and is an explanatory view of a lock structure for fixing a state in which the suspension arm is tilted backward. FIG. 8 is an explanatory diagram of a procedure for discharging the contained matter in the bucket.

Hereinafter, a bucket, which is an embodiment of the bucket according to the present invention, will be described with reference to FIGS. 1 to 8.

As shown in FIGS. 1 to 4, the bucket 1 according to the present embodiment is a concrete bucket that mainly transports concrete, and has a bucket main body 2 having an opening 24 at the upper part and a storage space for the contents inside. A suspension arm 3 having both ends rotatably attached to both side portions 22, 22 of the bucket main body 2 is provided.

The bucket body 2 is composed of a front portion 20, a rear portion 21, left and right side portions 22, 22 and a bottom portion 23. The front portion 20 is inclined toward the rear portion 21 toward the bottom portion 23. The rear portion 21 and the side portions 22, 22 are vertical or substantially vertical. As a result, the bucket body 2 is a box type in which the upper portion is opened to form an opening 24, and the opening 24 is wider (to the front side) than the bottom portion 23. In the present specification, the direction from the rotation center of the suspension arm 3 toward the front portion 20 is referred to as "front side", and the direction from the rotation center of the suspension arm 3 toward the rear portion 21 is referred to as "rear side".

Most of the bottom portion 23 is a flat surface along the ground contact surface on which the bucket body 2 touches the ground, but the front side portion 23a is formed in a curved surface shape (arc surface shape) that is separated from the ground contact surface of the bottom portion 23 toward the front side.

The front portion 20, the rear portion 21, and the left and right side portions 22, 22 each form a wall portion (front wall portion, rear wall portion, side wall portion). The front wall portion is an inclined wall that advances to the front side toward the opening 24, the rear wall portion is a vertical or substantially vertical vertical wall, and the left and right side wall portions are also vertical or substantially vertical vertical walls. ..

The front portion 20, the rear portion 21, the left and right side portions 22, 22 and the bottom portion 23 are made of steel plates. The rear portion 21 and the left and right side portions 22 and 22 are independent steel plates, respectively, but the front portion 20 and the bottom portion 23 are integrated objects in which an intermediate portion of one steel plate is curved to form a front side portion 23a. Each steel plate is appropriately joined by welding or the like to form the bucket body 2.

The strength of the bucket body 2 is reinforced by an appropriate reinforcing material. Specifically, in order to reinforce the opening 24, a long reinforcing material 25 is attached along the opening edge of the opening 24 of the front portion 20 and the left and right side portions 22, 22 respectively, and the bucket body 2 is attached. A long reinforcing member 26 is attached to each of the front portion 20, the rear portion 21, and the left and right side portions 22, 22 along the width direction in order to reinforce the waist circumference of the. In the present embodiment, angle steel (equal angle steel) is used as the reinforcing members 25 and 26, and both ends of the angle steel are joined to the steel plate by welding or the like.

Further, a long reinforcing member 27 is attached along the vertical direction to the center of the bucket body 2 in the front-rear direction (centers in the width direction of the left and right side portions 22, 22 respectively). In the present embodiment, the reinforcing material 27 is a square steel pipe (square pipe) or a square steel material, and is joined to the steel plates of the left and right side portions 22 and 22 by welding or the like.

The suspension arm 3 includes left and right vertical frames 30 and 30 that are rotatably attached to the left and right side portions 22 and 22 of the bucket body 2, and a horizontal frame 31 that connects the upper ends of the left and right vertical frames 30 and 30. It is a gate-shaped form.

The vertical frame 30 can rotate about a shaft portion 28 provided in the middle portion in the height direction of the side portion 22. In this embodiment, channel steel (grooved steel) is used for the vertical frame 30.

The horizontal frame 31 is a portion on which a hanging means such as a crane is hung. More specifically, suspension holes 33, 33 are provided at two positions on the left and right of the horizontal frame 31, a shackle is passed through the suspension holes 33, 33, and the wire slung on the crane is connected to the horizontal frame 31 via the shackle. Will be done. Alternatively, the hook at the tip of the wire may be hooked on the hanging holes 33, 33. In the present embodiment, the horizontal frame 31 is composed of a square steel material 31a and angle steels 31b and 31b joined to each surface of both sides of the square steel material 31a by welding or the like, and both ends thereof are at the upper ends of the vertical frame 30. It is joined by welding or the like. Then, a plate-shaped reinforcing member 32 is joined to each of the two left and right positions of the square steel material 31a by welding or the like, and a suspension hole 33 is formed in the central portion thereof.

The bucket 1 releases the first lock structure 4 for fixing the suspension arm 3 in an upright state so that it can be released, and the state in which the suspension arm 3 is tilted backward by a predetermined angle (about 120 degrees in this embodiment). It is provided with a second lock structure 5 for fixing as possible.

As shown in FIG. 5, the first lock structure 4 includes a movement restricting unit (stopper) 40 that regulates the suspension arm 3 from tilting forward from an upright state, and tilting backward from a state in which the suspension arm 3 stands up. It is composed of a movement control unit (stopper) 41 that regulates the movement. The first lock structure 4 is provided on each of the left and right side portions 22 and 22 of the bucket body 2, and is provided on each of the left and right vertical frames 30 and 30 of the suspension arm 3.

The movement restricting unit 40 restricts the suspension arm 3 from tilting forward by contacting a surface of the vertical frame 30 of the suspension arm 3 located in the rotation direction due to the forward tilt. In the present embodiment, the movement restricting portion 40 uses a plate-shaped or block-shaped steel material, and is joined to the steel plates of the left and right side portions 22, 22 by welding or the like. Further, in the present embodiment, the movement restricting portions 40 are provided at two upper and lower positions symmetrically with respect to the rotation centers (shaft portions 28) of the suspension arm 3.

The movement restricting unit 41 restricts the suspension arm 3 from tilting backward by contacting a surface of the vertical frame 30 of the suspension arm 3 located in the rotation direction due to the backward tilt. However, as will be described later, since it is necessary to allow the suspension arm 3 to tilt backward, the movement restricting unit 41 can move in and out of the vertical frame 30 of the suspension arm 3. Specifically, the movement restricting portion 41 is rotatably attached to a bracket 42 attached to the opening 24 of the bucket body 2, and when rotated outward, the vertical frame 30 of the suspension arm 3 is tilted backward. When it advances to the surface located in the rotation direction and, conversely, rotates inward (opening 24 side), it retracts from the surface. In the present embodiment, a plate-shaped or block-shaped steel material is used for the movement control unit 41. Further, the movement restricting unit 41 is provided with a handle 41a in order to facilitate the rotation operation.

Here, as shown in FIG. 6, the center of rotation (shaft portion 28) of the suspension arm 3 is a bucket body 2 in a state where the maximum amount of the contained object is accommodated (a bucket in a state where the contained object is accommodated up to the waterline of the bucket body 2). It is set at a position deviated from the center of gravity G within a region having a predetermined radius centered on the center of gravity G of the main body 2). In the present embodiment, the radius is 100 to 150 mm, and the center of rotation of the suspension arm 3 is set at a position in the first region R1 on the rear upper side. The reason for doing this is as follows.

It is preferable that the movement restricting portions 40 and 41 are provided so as to come into contact with the suspension arm 3 without gaps, respectively, but gaps are generated due to manufacturing errors or slight deformation or wear of the movement restricting portions 40 and 41 due to aging. If there is this gap, the bucket body 2 may rattle, albeit slightly, when the bucket 1 is lifted and transported. Therefore, if the positions are shifted as described above, the bucket body 2 is subjected to a force on the front side during transportation of the bucket 1, and the movement restricting portion 41 is maintained in contact with the suspension arm 3. Therefore, the rattling of the bucket body 2 is suppressed, and the stability during transportation is improved.

When it is desired to suppress rattling by the movement restricting unit 40, the rotation center of the suspension arm 3 is set in the second region R2 on the front side upper side. When the specific gravity of the contained object is heavy, the rotation center of the suspension arm 3 is set to the upper first region R1 or the second region R2, but when the specific gravity is light, the lower third region R3 or the third region R3 or the third region R2. It can also be set in the four-region R4.

As shown in FIG. 7, the second lock structure 5 has a movement restricting portion (stopper) 50 (“lock member” of the present invention) that regulates the movement of the suspension arm 3 from a state of being tilted backward by a predetermined angle in a standing direction. The suspension arm 3 is composed of a movement restricting unit (stopper) 56 that regulates the movement of the suspension arm 3 from the state of being tilted backward to the direction of further tilting backward. The second lock structure 5 is provided on the rear portion 21 of the bucket body 2, and the movement restricting portions 50 and 56 are provided on the left and right vertical frames 30 and 30 of the suspension arm 3, respectively.

The movement restricting unit 50 restricts the suspension arm 3 from moving in the standing direction by abutting on a surface of the vertical frame 30 of the hanging arm 3 located in the rotation direction in the standing direction. However, since it is necessary to allow the suspension arm 3 to return to the upright state, the movement restricting unit 50 can move in and out of the vertical frame 30 of the suspension arm 3. Specifically, the movement restricting portion 50 is slidably inserted into the holes formed in the pair of brackets 51, 51 attached to the rear portion 21 of the bucket body 2, and when slid outward, the suspension arm 3 is vertically inserted. When the frame 30 advances to a surface located in the direction of rotation in the upright direction and, conversely, slides inward, the frame 30 retracts from the surface. In the present embodiment, the movement control unit 50 uses a round steel material and takes the form of a long pin body.

Then, in order to synchronously perform the exit / exit operations of the pair of movement restricting portions 50, 50, the second lock structure 5 is rotatably attached to the rear portion 21 of the bucket body 2 at the rotation center 52a with the lever 52. , A pair of movement restricting portions 50, 50 and a link mechanism operatively connected to the lever 52. The link mechanism has a first link 53, one end of which is rotatably connected to the base end of one of the movement restricting portions 50, and the other end of which is rotatably connected to a predetermined position of the lever 52, and one end of the other. It is rotatably connected to the base end of the movement restricting portion 50, and the other end is opposite to the predetermined position of the lever 52 (the other end of the first link 53 is connected with the rotation center 52a sandwiched between them). ) Is rotatably connected to the second link 54.

With this configuration, at the first rotation position of the lever 52 (see FIG. 7A), the pair of movement restricting portions 50 and 50 retract, and conversely, the lever 52 is moved to the second rotation position (see FIG. 7B). ), The pair of movement control units 50, 50 advance in synchronization. In this way, by switching one lever 52, the pair of movement restricting units 50 and 50 can be synchronously moved in and out, so that a human error of forgetting to operate one of the movement restricting units 50 is a human error. Can be prevented. A pair of rotation restricting portions (stoppers) 55 and 55 are provided in both rotation directions of the lever 52 to restrict the rotation of the lever 52 between the first rotation position and the second rotation position.

The movement restricting unit 51 restricts the suspension arm 3 from further tilting backward by contacting a surface of the vertical frame 30 of the suspension arm 3 located in the rotational direction due to the backward tilt. In the present embodiment, the movement restricting portion 51 is made of a round steel material, takes the form of a pin body, and is joined to the base plate 57 joined to the rear portion 21 of the bucket body 2 by welding or the like.

The bucket 1 according to the present embodiment has the above configuration, and next, a method for transporting concrete will be described.

First, when receiving the supply of concrete from the concrete mixer, as shown in FIG. 4, the suspension arm 3 is tilted backward to open the upper part of the opening 24 so that the concrete can be easily received. Then, when the concrete is accommodated, as shown in FIG. 1, the suspension arm 3 is erected, and in this state, the bucket 1 is transported to the casting location by a suspension means such as a crane. At this time, as described above, since the movement restricting portion 41 is maintained in contact with the suspension arm 3, the bucket body 2 does not rattle and can be stably transported.

At the casting location, the bucket 1 is once lowered to the ground plane. Then, the suspension arm 3 is tilted backward again, and the state in which the suspension arm 3 is tilted backward is fixed by the lock structure 5. In that state, as shown in FIGS. 8A to 8C, the wire 6 is slowly pulled up, the bucket body 2 is gradually tilted forward, and the contained object is slowly discharged. At this time, since the front side portion 23a of the bottom portion 23 of the bucket main body 2 has a curved surface shape, it is possible to prevent the bucket main body 2 from tilting due to a sudden change in angle and discharging the contents at once.

When the contents are discharged, the wire 6 is pulled down to return the bucket body 2 to the original mounting state, the lock structure 5 is unlocked, and the suspension arm 3 is erected. In this state, the suspension arm 3 is returned to the original position. Move it. Then, by repeating these series of operations, the concrete is continuously transported to the casting site.

According to the bucket 1 according to the present embodiment, a large capacity can be realized with a simple structure. As the capacity, 1 cubic meter or more is preferable, and 10 cubic meters or less is preferable.

The bucket according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, in the above embodiment, concrete is targeted as an inclusion. However, the contained material according to the present invention is not limited to concrete, and may be earth and sand, residual soil, rubble, and the like.

1 ... bucket, 2 ... bucket body, 20 ... front, 21 ... rear, 22 ... side, 23 ... bottom, 23a ... front part, 24 ... opening, 25 ... opening reinforcement, 26 ... waist circumference Reinforcing material, 27 ... Vertical reinforcing material, 28 ... Shaft, 3 ... Suspension arm, 30 ... Vertical frame, 31 ... Horizontal frame, 31a ... Square steel material, 31b ... Angle steel, 32 ... Reinforcing material, 33 ... Suspension hole 4, 4 ... 1st lock structure, 40 ... Movement regulation part (stopper), 41 ... Movement regulation part (stopper), 41a ... Handle, 42 ... Bracket, 5 ... Second lock structure, 50 ... Movement regulation part (stopper) ), 51 ... Bracket, 52 ... Lever, 52a ... Center of gravity, 53 ... 1st link, 54 ... 2nd link, 55 ... Rotation control part (stopper), 56 ... Movement control part (stopper), 57 ... Base plate, 6 ... Wire, G ... Center of gravity, R1 ... 1st region, R2 ... 2nd region, R3 ... 3rd region, R4 ... 4th region

Claims (5)

A bucket that is lifted by a lifting means such as a crane and transports the contents by moving the hanging means.
A bucket body with an opening at the top and a storage space for the contents inside,
A gate-shaped hanging arm with both ends rotatably attached to both sides of the bucket body,
A bucket having a lock structure for fixing the hanging arm so that it can be released from a state in which it is tilted backward by a predetermined angle from a state in which it stands up against the bucket body. The lock structure is
A pair of lock members that move in and out of each frame on the left and right of the hanging arm,
A lever that can be rotatably attached to the bucket body,
Claimed to include a link mechanism that is operatively connected to a pair of lock members and a lever and moves the pair of lock members in and out in synchronization by switching the lever between a first rotation position and a second rotation position. The bucket according to 1. The bucket according to claim 1 or 2, wherein the front side portion of the bottom portion of the bucket body is formed in a curved surface shape so as to be separated from the ground contact surface of the bottom portion toward the front side. The bucket according to any one of claims 1 to 3, further comprising a lock structure for fixing the hanging arm so as to be able to release the standing state with respect to the bucket body. One of claims 1 to 4, wherein both ends of the suspension arm are attached at positions deviated from the center of gravity within a region having a predetermined radius centered on the center of gravity of the bucket body in a state where the maximum amount of contained matter is stored. The bucket described in.

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