JP5416177B2 - Bucket loader safety device - Google Patents

Description

  The present invention relates to a safety device for a bucket loader. More particularly, the present invention relates to a safety device for a bucket loader for preventing the bucket from dropping due to the cutting of the hoisting member of the bucket loader.

  The bucket loader is for lifting an object to be conveyed (for example, an object to be crushed which is a raw material for recycling such as asphalt or concrete) to an upper hopper or the like. The bucket loader generally moves up and down by the action of a winch that winds up a wire rope or the like. As the bucket, a bucket of a crane attached to a vehicle or the like, or a bucket such as a crane installed and used at a specific place is known. In particular, in the case of a large bucket loader, the weight of the object to be transported that can be loaded on the bucket increases, and the bucket itself also increases in size.

  In such a bucket, when the wire rope or the like is cut and the bucket falls during the lifting operation, the damage is immeasurable, which causes a serious problem for the safety of the operator. For this reason, in preparation for the cutting of the wire rope, a device for preventing the fall and a detecting means for detecting the cutting of the rope are provided. These known technologies are, for example, facilities for lifting concrete, but facilities for lifting a container corresponding to a bucket from a lower position through a wire rope to a patcher plant installed above while guiding it with a guide rail are known. It has been. This equipment is provided with a ratchet type safety device, that is, a fall prevention device in preparation for wire rope cutting (see, for example, Patent Document 1).

  As another example, in a facility for raising and lowering a bucket of a bucket loader with a wire rope, one having a wire breakage detection device is known. In this example, a structure is disclosed in which the detection device is activated when the wire rope is cut and the wheels of the bucket traveling along the guide rail are forcibly pinched and stopped (for example, patents). Reference 2).

  Furthermore, as another example, a configuration similar to the above-described bucket loader is disclosed, but as a fall prevention device, a configuration in which the elevating mechanism includes a roller chain with an attachment, a pin gear, and a deceleration motor with a brake is disclosed. (For example, see Patent Document 3).

Japanese Unexamined Patent Publication No. 7-54329 JP 2008-120497 A JP 2008-114987 A

  As described above, various types of bucket loaders provided with a safety device are known. However, the conventional method is to detect the state electrically with a detector such as a limit switch and perform treatment. Especially in a large bucket loader, the damage caused by the bucket dropping is immeasurable. At present, there is no means for mechanically preventing the conventional bucket loader from dropping. In addition, what is performed under electrical control may cause a delay in operation or failure of the control itself. Further, the method of preventing the fall by the frictional force is not the one that can be surely prevented mechanically because there is an element that changes the conditions with the passage of time. Ratchet-type equipment can be seen as non-bucket loaders, such as elevators for personnel and luggage, but the structure is complicated.

The present invention has been made to solve the above-described problems, and achieves the following object.
An object of the present invention is to provide a bucket loader safety device that has a simple structure and can reliably prevent the bucket from dropping.

The present invention takes the following means in order to achieve the object.
The safety device of the bucket loader of the present invention 1
A bucket that is movable up and down on the frame body, a guide rail that is provided on the frame body and guides the bucket to move up and down, and that is provided on the frame body and drives the bucket up and down via a hoisting member. In a bucket loader configured with a drive device, a rack provided along the vertical direction of the guide rail, a ratchet support provided on the bucket opposite to the rack, and movable to the ratchet support A ratchet pawl body which can be engaged with the rack, a spring body which is provided on the ratchet support body and urges the ratchet pawl body toward the rack, and is provided on the ratchet support body. And an electromagnetic actuating body that is spaced apart from the rack side.

  The bucket loader safety device according to the second aspect of the present invention is characterized in that, in the first aspect, the winding member is a wire rope.

  A bucket loader safety device according to a third aspect of the invention is characterized in that, in the first or second aspect, the ratchet pawl is configured to go straight in a direction perpendicular to the bucket moving direction and mesh with the rack.

  A bucket loader safety device according to a fourth aspect of the invention is characterized in that, in the first or second aspect of the invention, the ratchet pawl is configured to engage with the rack by swinging in a plane including a bucket moving direction. To do.

  Since the bucket loader safety device of the present invention has a structure in which it is mechanically stopped, the bucket loader in the bucket loader can be reliably prevented from falling with a simple configuration. And it is the structure which can perform fall prevention operation | work instantaneously at the time of the fall of a bucket at the time of the cutting | disconnection of a winding member. Also, when only the hoisting member is replaced at the time of re-operation, the return operation can be performed immediately.

FIG. 1 is a front view of the bucket loader. FIG. 2 is a side view of the bucket loader. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a front view of the safety device of the bucket loader and shows a state in which the ratchet pawl is engaged with the rack. FIG. 5 is a front view of the safety device of the bucket loader, and shows a state in which the ratchet pawl moves freely on the rack while the bucket is moving upward. FIG. 6 is a front view of the safety device of the bucket loader and shows a state in which the ratchet pawl is separated from the rack by the operation of the electromagnetic actuator while the bucket is moving downward. FIG. 7 is a front view of a bucket loader safety device according to another embodiment, and shows a state in which a ratchet pawl is engaged with a rack, partially in cross section. FIG. 8 is a front view of a safety device for a bucket loader according to another embodiment, showing a state in which the ratchet pawl is free to move on the rack while the bucket is moving upward. FIG. 9 is a front view of a safety device for a bucket loader according to another embodiment, in which the ratchet pawl is separated from the rack by the operation of the electromagnetic actuator while the bucket is moving downward.

  An embodiment of a bucket loader safety device according to the present invention will be described in detail with reference to the drawings. In order to facilitate understanding of the contents of the present invention, a basic configuration of the bucket loader 1 will be described. A bucket loader 1 to which the present invention is applied is a facility having a relatively large bucket 2 having a weight of 98KN (10 tons) or more for a transported object to be loaded, and a base is fixedly installed on the ground. . This bucket loader 1 puts a heavy, heavy and heavy transported object (for example, asphalt or concrete to be crushed) into a hopper 3 provided above, which cannot be lifted by a backhoe or the like. Is to do.

  The bucket 2 is configured to be movable up and down, and a base body that is a main body that supports the bucket 2 forms a frame body 4 made of shape steel. A part of the frame body 4 constitutes a pair of guide rails 5 on both sides of the bucket 2 and serves as a guide for raising and lowering the bucket 2. In this embodiment, the bucket 2 has a box shape with an open opening formed on the upper side, and two wheels, a first wheel 6a and a second wheel 6b, are separately arranged on both sides. On the other hand, the guide rail 5 is made of groove steel having a U-shaped groove cross section, and this U-shaped groove constitutes the groove portion 5g. The first wheel 6a and the second wheel 6b, which are two wheels fixedly provided at different positions on the side surface of the bucket 2, are guided by the groove 5g (see FIG. 3).

  This guide rail 5 is composed of a first guide rail 5a for the first wheel 6a and a second guide rail 5b for the second wheel 6b. The first guide rail 5 a and the second guide rail 5 b are paired, and the same configuration is symmetrically disposed opposite to both side surfaces of the bucket 2. The first guide rail 5a and the second guide rail 5b are arranged such that the opening of the U-shaped groove 5g faces the inside of the frame body 4, that is, toward the bucket 2 side, and the first wheel 6a of the bucket 2 is arranged. The second wheel 6b is fitted. Therefore, the first guide rail 5a, the second guide rail 5a, and the second guide rail 5a are paired in the bucket 2 while the first wheel 6a and the second wheel 6b, which are the four wheels forming a pair, are guided by the groove 5g. It goes up and down along the guide rail 5b.

  When the bucket 2 moves up and down along the first guide rail 5a and the second guide rail 5b, the guide rail 5 can be moved up and down while maintaining a certain posture (horizontal posture with the opening of the bucket 2 facing upward). The first wheel 6a of the bucket 2 is guided by the first guide rail 5a arranged opposite to the first wheel 6b of the bucket 2, and the second guide rail 5b arranged opposite to the second wheel 6b of the bucket 2 is configured. Be guided to. Both the first guide rail 5a and the second guide rail 5b constitute a bent portion on the upper end side, that is, a first bent portion 5c and a second bent portion 5d. Further, the lower side of the guide rail 5 is also bent, and bent portions 5e and 5f are formed in the direction in which the bucket 2 protrudes to the working position.

  As shown in FIG. 1, a winch 7 is installed at the lower part of the frame body 4. The winch 7 includes a drum 9 that winds a wire rope 8 that is a winding member, and a motor 10 that rotationally drives the drum 9. Two pulleys around which the wire rope 8 is wound, that is, a first pulley 11 and a second pulley 12 are rotatably provided at a fixed position on the upper portion of the frame body 4.

  On the other hand, the third pulley 13 is also provided on the side surface of the bucket 2, and the wire rope 8 is wound around the two pulleys (the first pulley 11 and the second pulley 12) on the frame body 4. . As shown in FIG. 1, the wire rope 8 is wound around the second pulley 12 from the drum 9 below the frame body 4 through the upper first pulley 11 and the third pulley 13 and from the second pulley 12. The wire rope 8 extends in the lower direction and is wound around a fourth pulley 14 provided in the bucket 2.

  The end of the wire rope 8 is fixed to the lower part of the frame body 4. This configuration is paired, and the same configuration is also formed on the other guide rail 5 side of the pair, and is driven to wind up by a common winch 7 so that the bucket 2 is supported on both sides and lifted in a balanced manner. ing. In such a configuration, when the winch 7 is operated by driving the motor 10, the drum 9 rotates and winds the wire rope 8. In accordance with this winding, the bucket 2 moves up and down while maintaining a horizontal posture, and when the second wheel 6b reaches the end of the second bent portion 5d of the second guide rail 5b, the second wheel 6b stops. It has become. However, the bucket 2 itself continues to move.

  On the other hand, when the first wheel 6a reaches the first bent portion 5c of the first guide rail 5a, the second wheel 6b is stopped, but the bucket 2 still moves along the shape of the first bent portion 5c. The posture of the bucket 2 is gradually inclined according to the movement. Eventually, the opening of the bucket 2 falls to the hopper 3 side, and the conveyed object in the bucket 2 is dropped onto the hopper 3. Next, the drum 9 of the winch 7 is rotated in the reverse direction, the bucket 2 is moved on the guide rail 5 in the direction opposite to the upward direction and moved in the downward direction, the conveyed object is supplied to the empty bucket 2, and the above-mentioned is again performed. The operation is repeated, and the conveyed object is repeatedly thrown into the hopper 3 from the ground.

  Two wire ropes 8 are wound around the drum 9 of the winch 7 so that one is led to a pulley on one side of the bucket 2 and the other is led to a pulley on the other side of the bucket 2. It has become. Although not shown, the wire rope 8 from the drum 9 changes its direction via a plurality of intermediate pulleys 15 provided on the frame body 4 and is guided to the first pulley 11 and the like.

  The lower end portions of the first guide rail 5a and the second guide rail 5b constitute bent portions 5e and 5f toward the outside of the frame body 4 like the upper end portion. This is a configuration for arranging the bucket 2 on the near side in consideration of the ease of supply of the object to be conveyed to the bucket 2. The bucket 2 repeats the raising / lowering operation in this manner. Thus, although the bucket 2 moves up and down in the vertical direction, since the weight is large, the wire rope 8 may be cut while the lifting operation is repeated.

  Accidents associated with the cutting of the wire rope 8 have a profound effect and must be avoided. For this reason, it is necessary to prevent the bucket 2 from falling downward. The safety device 16 is a device for this purpose. Next, the safety device 16 of the bucket loader 1 will be described in detail with reference to FIGS.

  A rack 17 is provided on the guide rail 5 along the moving direction of the bucket 2. The rack 17 has a structure in which peaks and valleys are continuously formed in a constant pitch structure, and the ratchet pawl body 18 is held by the valleys. The rack 17 is formed with a substantially triangular peak portion 17a having an abutting surface 17b on one side and an inclined surface 17c on the other side at a predetermined pitch. A valley is formed between the peak 17a and the peak 17a. The abutting surface 17b is formed so as to face the upper side in the moving direction of the bucket 2. In other words, the rack 17 is a member called a ratchet track or the like formed by extending a ratchet wheel formed with sawtooth-like teeth linearly. On the other hand, on the bucket 2 side, a ratchet claw body 18 is provided so as to face the rack 17 and engage with the rack 17. FIG. 4 shows a state in which the ratchet pawl 18 is engaged with the rack 17. The ratchet pawl 18 is supported by a ratchet support 19 provided on the bucket 2 through two bar guides 20 so as to be movable forward and backward. The ratchet support 19 is fixed to a fixed position of the bucket 2 and incorporates an electromagnetic actuator 21 that is an electromagnetic actuator.

  A part of the ratchet pawl 18 is fixed to the mover of the electromagnetic actuator 21 as a connecting member 22. Since the electromagnetic actuator 21 is a known device, a detailed description of the structure is omitted, but the movable element is relatively movable by a magnetic force generated by supplying an exciting current to the stator. As shown in FIGS. 4 to 6, the ratchet pawl 18 is movable forward and backward in the direction perpendicular to the moving direction of the bucket 2 together with the mover with respect to the rack 17.

  As described above, the advancing / retreating operation allows the ratchet pawl 18 to smoothly move, stop at a predetermined position, and the like by the bar guide 20 provided on the ratchet support 19. By providing the two bar guides 20, the ratchet pawl body 18 and the rack 17 can be kept in a normal state even when a load is applied to the ratchet pawl body 18 described later. Accordingly, the ratchet pawl body 18 maintains its position stably even when the meshing operation with the rack 17 is repeated. The ratchet pawl 18 is urged by a spring 23 in a direction in which the ratchet pawl 18 is pressed toward the rack 17 relative to the ratchet support 19.

  The spring 23 is disposed between the ratchet support 19 and the ratchet pawl 18, and the spring 23 is configured as a compression spring that constantly biases the ratchet pawl 18 toward the rack 17. The ratchet support 19 side of the spring 23 is embedded inside. The ratchet pawl 18 is pressed by a spring 23, but stops at a fixed position.

  One end of the ratchet pawl 18 is connected to the mover of the electromagnetic actuator 21 via the connecting member 22 as described above. When the exciting current is not supplied to the electromagnetic actuator 21, the mover is in a free state, so that the ratchet pawl 18 is pressed and meshed with the rack 17 only by the urging force of the spring 23. When an excitation current is supplied to the electromagnetic actuator 21, the mover moves in a direction away from the rack 17 side (a direction indicated by a left arrow in FIG. 6) as shown in FIG.

  That is, the connecting member 22 is pulled away from the rack 17 side, and the ratchet pawl body 18 is forcibly pulled away from the rack 17. As a result, when the bucket 2 moves downward (in the direction indicated by the downward arrow in FIG. 6), the ratchet pawl body 18 is moved to the rack by supplying the excitation current to the electromagnetic actuator 21 and moving the mover. 17 is disengaged and the state where interference is avoided is maintained. The safety device 16 has such a configuration and operates as follows.

  The bucket 2 is positioned at the lower part of the frame body 4, takes in an object to be conveyed, and then winds the wire rope 8 by the drive of the winch 7 and moves it upward. At this time, the bucket 2 is guided by the first wheel 6a and the second wheel 6b fitted in the grooves of the guide rail 5 while maintaining the horizontal posture in which the opening is facing upward, and the first pulley 11 and the second pulley 2 are guided. It is lifted by the wire rope 8 through the pulley 12, the third pulley 13, and the like.

  A rack 17 is provided on the guide rail 5 along the bucket 2 moving direction. The rack 17 is provided on both guide rails 5 that form a pair. In the present embodiment, the rack 17 is provided on the second guide rail 5b side. The arrangement of the safety device 16 avoids interference with the wire rope 8 and is a design problem. The safety device may be provided on the first guide rail 5a side as long as interference can be avoided. On the other hand, the ratchet pawl 18 provided in the bucket 2 is pressed toward the rack 17 by the urging force of the spring 23.

  When the bucket 2 moves upward, the surface of the ratchet pawl 18 such as the inclined portion 18a slides while contacting the inclined surface 17c of the rack 17, the surface of the mountain portion 17a, etc., and resists the biasing force of the spring 23. And move away from the rack 17. As shown in FIG. 5, the ratchet pawl body 18 is disengaged from the rack 17, and the ratchet pawl 18 gets over the mountain portion 17 a of the rack 17. When the ratchet pawl body 18 gets over the mountain portion 17a, it is biased by the spring 23 and moves to the valley side (rack 17 side). In this way, the ratchet pawl body 18 repeats the movement while being in contact with the inclined surface 17c of the rack 17 and the movement toward the valley side as the bucket 2 moves upward, and the bucket 2 moves upward in a free state ( In the direction shown by the upward arrow in FIG. At this time, the electromagnetic actuator 21 is not operating.

  Next, when the bucket 2 drops an object to be conveyed or the like onto the hopper 3, the operation moves down. At this time, the electromagnetic actuator 21 is operated by supplying an exciting current, and the ratchet pawl 18 is forcibly separated from the rack 17 against the biasing force of the spring 23 as shown in FIG. While maintaining this state, the bucket 2 can be moved downward in the free state (the direction indicated by the downward arrow in FIG. 6). Usually, the operation can be continued by repeating this operation. However, if the wire rope 8 is cut while the bucket 2 is moving upward, the bucket 2 falls.

  The safety device 16 described above eliminates the falling of the bucket 2 instantly. The safety device 16 is provided on the side surface of the bucket 2 in the vicinity of the second wheel 6b. As described above, this is a portion that avoids interference with the wire rope 8. If the wire rope 8 is cut even when the bucket 2 is moving upward, the bucket 2 is about to drop instantaneously. At this time, the ratchet pawl body 18 is always pressed against the rack 17 side by the spring 23, so that the tip side portion such as the inclined portion 18a of the ratchet pawl body 18 is on the valley side of the rack 17 as shown in FIG. The abutting surface 17b of the rack 17 and the abutting surface 18b of the ratchet claw body 18 are brought into contact with each other to be locked, and the bucket 2 is prevented from falling.

  The ratchet pawl 18 moves straight in the direction perpendicular to the rack 17 by the guide of the bar guide 20 and is forcibly engaged with the rack 17 by the urging force of the spring 23. Since the abutting surface 18b of the ratchet claw body 18 is set within 90 degrees in the direction perpendicular to the dropping direction, the ratchet claw body 18 meshes with the rack 17 without coming off. When the ratchet pawl 18 and the rack 17 are engaged with each other, the ratchet pawl 18 guided by the bar guide 20 has a force to move in a direction away from the rack 17 (a direction indicated by a left arrow in FIG. 6). Does not work. Therefore, the ratchet pawl body 18 does not come off the rack 17 after being engaged, and the bucket 2 does not fall.

  In this way, the ratchet pawl 18 is engaged with the rack 17 only by the urging force of the spring 23 without any other control at the same time as the fall, so at the moment when the wire rope 8 is cut, The bucket 2 is prevented from falling. For this reason, the safety device 16 is simple without requiring an electrical sensor for detecting the breakage of the wire rope 8 and a control device for driving a servo mechanism as a safety device in response to a signal from the sensor. It has a certain structure.

(Other embodiments)
In the above-described configuration, the ratchet pawl body is engaged with the rack by linearly moving in a direction perpendicular to the moving direction of the bucket, but may be engaged with the racket. 7 to 9 are diagrams showing the configuration. Similar to the ratchet support 20, the ratchet support 30 is fixed at a predetermined position of the bucket. The ratchet support 30 is provided with support pins 31. A part of the ratchet support 30 protrudes toward the rack 17, and the support portion 30 a is formed in a U shape, and supports both ends of the support pin 31. The ratchet pawl 32 is inserted into the support pin 31 so as to be swingable, and is sandwiched between the U-shapes of the support portion 30a.

  The ratchet claw body 32 has a claw portion 32a on one side and a pressed portion 32b on the other side. The claw portion 32 a of the ratchet claw body 32 faces the rack 17 and can swing around the support pin 31. The ratchet pawl body 32 swings in the plane of the bucket 2 in the moving direction. Further, a spring 33 is pressed on the claw portion 32a side of the ratchet claw body 32, and this spring 33 is supported by the ratchet support body 30 and urges the claw portion 32a to always press the rack 17 side. . The spring 33 in this case is a compression spring. By the urging of the spring 33, the ratchet pawl body 32 swings in the counterclockwise direction in FIG.

  On the other hand, the ratchet support 30 incorporates an electromagnetic actuator 34, and a pressing member 35 is connected to one end of the mover. The pressing member 35 projects outward from the ratchet support 30 so that the pressed portion 32b of the ratchet pawl 32 can be pressed. The electromagnetic actuator 34 is of a type in which the mover extends toward the rack 17 when an exciting current is supplied. The other embodiments have such a configuration and operate as follows.

  FIG. 7 shows a configuration in which the claw portion 32 a of the ratchet claw body 32 is engaged with the rack 17. When the bucket 2 moves upward as described above, the ratchet pawl body maintains the free state while the claw portion 32a contacts the top of the rack 17 against the urging force of the spring 33 as shown in FIG. 32, the bucket 2 provided with the ratchet support 30 can be moved upward in the upward direction (the direction indicated by the upward arrow in FIG. 8). That is, even if the electromagnetic actuator 34 does not operate, the claw portion 32a swings in the clockwise direction in FIG. 8 by the inclined surface 17c of the rack 17 against the urging force of the spring 33, and the claw portion 32a Get over 17 mountain 17a. That is, when the bucket 2 moves upward, the ratchet pawl body 32 swings in the direction (counterclockwise direction in FIG. 8) in which the pawl portion 32a moves to the valley side (rack 17 side) of the rack 17, and Since the claw portion 32a moves over the mountain portion 17a of the rack 17 while swinging in the direction (clockwise direction in FIG. 8) over the mountain portion 17a, the bucket 2 can move up in a free state. Become.

  When the bucket 2 moves downward, it operates by supplying an excitation current to the electromagnetic actuator 34, and the pressing member 35 protrudes when the mover operates in the extending direction (the direction indicated by the right-pointing arrow in FIG. 9), and the ratchet The pressed portion 32b of the nail body 32 is pressed. As a result, the ratchet pawl 32 swings about the support pin 31 in the clockwise direction in FIG. 9, and the pawl 32 a can be forcibly separated from the rack 17 against the biasing force of the spring 33. In this state, the bucket loader 2 can move downward without interfering with the rack 17 (the direction indicated by the downward arrow in FIG. 9).

  This other embodiment has such a configuration, but the operation at the time of dropping is the same as that of the above-described embodiment, and when the wire rope 8 is cut during the upward movement, simultaneously with the dropping operation of the bucket 2, The claw 32 a swings counterclockwise in FIG. 7 around the support pin 31 by the urging force of the spring 33, and instantly fits into the rack 17. That is, the claw portion 32a of the ratchet claw body 32 comes into contact with the abutting surface 17b of the rack 17 to be in a locked state as shown in FIG. At this time, the force to swing the ratchet pawl 32 around the support pin 31 in the clockwise direction in FIG. As a result, the bucket 2 can be prevented from dropping mechanically and reliably without requiring electrical control, as described above.

  As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to this form, and can change within the range which does not deviate from the objective of this invention and the meaning. For example, although the winding member has been described as a wire rope, it goes without saying that it may be a chain.

DESCRIPTION OF SYMBOLS 1 ... Bucket loader 2 ... Bucket 3 ... Hopper 4 ... Frame body 5 ... Guide rail 5a ... 1st guide rail 5b ... 2nd guide rail 6a ... 1st wheel 6b ... 2nd wheel 7 ... Winch 8 ... Wire rope 9 ... Drum DESCRIPTION OF SYMBOLS 10 ... Motor 11 ... 1st pulley 12 ... 2nd pulley 13 ... 3rd pulley 16 ... Safety device 17 ... Rack 18, 32 ... Ratchet pawl body 19,30 ... Ratchet support body 21,34 ... Electromagnetic actuator (electromagnetic actuator)
23, 33 ... Spring

Claims (4)

A bucket (2) movable up and down on the frame body (4);
A guide rail (5) provided on the frame body (4) for guiding the bucket (2) to be raised and lowered;
In a bucket loader (1) configured with a drive device (7) provided on the frame body (4) for driving the bucket (2) up and down via a hoisting member (8),
A rack (17) provided along the vertical direction of the guide rail (5);
A ratchet support (19) provided on the bucket (2) facing the rack (17);
A ratchet pawl (18) movably provided on the ratchet support (19) and meshable with the rack (17);
A spring body (23) provided on the ratchet support (19) and biasing the ratchet pawl (18) toward the rack (17);
A bucket loader safety device comprising: an electromagnetic actuator (21) provided on the ratchet support (19) and configured to separate the ratchet pawl (18) from the rack (17) side. In the bucket loader safety device according to claim 1,
The bucket loader safety device, wherein the winding member (8) is a wire rope (8). In the bucket loader safety device according to claim 1 or 2,
The ratchet pawl (18) is configured to go straight in a direction perpendicular to the bucket moving direction and mesh with the rack (17). In the bucket loader safety device according to claim 1 or 2,
The said ratchet nail | claw body (32) is the structure which rock | fluctuates in the surface containing a bucket moving direction, and has the structure which meshes | engages with the said rack (17). The safety device of the bucket loader characterized by the above-mentioned.

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