JPH08277099A - Bucket stabilizing mechanism of high place working vehicle - Google Patents

Abstract

PURPOSE: To provide a mechanism capable of following the elevation angle of a boom, even with a simple structure, and of maintaining a bucket vertically at all times. CONSTITUTION: A bucket 25 where a worker gets is suspended at an end of a boom elevated up and down. A fixed gear 47 having a toothed surface at its outer circumference is fixed at the end of the boom 23. At an upper part of the bucket 25, a follower gear 71 having a toothed surface at its outer circumference is journalled rotatably, and the rotational centers of the gears 47 and 71 are connected by swingable plates 54, 55 so as to turn freely. On these plates 54, 55, horizontal rack bodies 63, 63 having an upper rack gear 64 and a lower rack gear 65 on the upper and the lower surface thereof are supported respectively so as to slide freely, and the upper rack gear 64 of the rack body 63 is meshed with the fixed gear 47 while the lower rack gear 65 is meshed with the follower gear 71 and thereby the bucket 25 is maintained to be vertical at all times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle for performing various operations at a high place, and more particularly to a bucket stabilizing mechanism for an aerial work vehicle capable of keeping a suspended bucket vertically. .

[0002]

2. Description of the Related Art As buildings and buildings are becoming taller and the number of three-dimensional structures is increasing, construction of highways, building construction, power line and signal line connection work on utility poles, and even on high-rise wall surfaces Various kinds of work at high places are increasing, such as the work of attaching signs. In addition, the work of repairing and inspecting traffic lights and lighting equipment installed on roads and pruning trees at high positions is increasing with the modernization of the city.

For various works at high positions in the related art, scaffolds have been assembled to a building, and workers have been climbing and descending to high places by using these scaffolds. In addition, ladders and stepladders were used for work on relatively low buildings such as the second and third floors, and workers were able to climb the ladder and stepladders to higher positions. Furthermore, when painting or cleaning the wall surface of a building, a rope is hung from the rooftop, and the worker can descend along the wall surface by traveling along the rope, working in high places. However, using such scaffolds, ladders, stepladders, etc. to climb and descend to high places is cumbersome and inefficient in the work of installing and removing the scaffold, and is not suitable for hanging from the roof of the building using ropes. , There was a danger to the workers.

In order to solve such a problem in working at a high place, a bucket is attached to the end of an expanding / contracting arm or a bending / extending boom to expand / contract the boom or arm.
An aerial work vehicle that can move a bucket to a high place by bending and bending has been used. With this aerial work vehicle, the boom and the bucket attached to the tip of the arm can be moved up and down together with the workers and materials, and various work at high altitudes can be performed smoothly.

As described above, various aerial work vehicles have been proposed for aerial work vehicles for working at a high place. Among these, a boom type aerial work vehicle, which has a relatively small bucket with a small floor area and can lift up or down one or two workers, is also relatively frequently used. Boom-type aerial work vehicles that move such buckets up and down are used for connecting power lines and signal lines at the tops of utility poles, for repairing and inspecting walls of buildings and structures, and for pruning trees. Widely used. In this boom-type aerial work vehicle, it was necessary to keep the suspended bucket always vertical.
This is because if the bucket is tilted, a worker on the bucket may fall and pose a risk. For this reason, the boom vertical aerial work vehicle has adopted the vertical maintenance mechanism of the bucket as an indispensable mechanism.

Therefore, in the conventional boom type aerial work vehicle, a correction hydraulic cylinder is interposed between the boom and the bucket, and the correction hydraulic cylinder is expanded and contracted according to the elevation angle of the boom to correct the bucket angle. Was provided. With this mechanism, the bucket has the feature that the bucket can always be raised vertically by the correction hydraulic cylinder, no matter what angle the boom is raised. However, with this mechanism, the hydraulic hose must be extended from the vehicle body to the tip of the boom and pressure oil for correction must be supplied to the correction hydraulic cylinder, which increases the weight of the boom itself and complicates the mechanism. Had.

Further, a simple vertical maintaining mechanism, which suspends a bucket at the tip of a boom so that it can freely swing and always maintains a vertical position by the weight of the bucket, is also used in boom type aerial work vehicles. This mechanism does not require a correction hydraulic cylinder and does not need to connect a hydraulic hose for supplying pressure oil, so that the weight of the device can be reduced. This mechanism is widely used when a bucket is attached to the tip of the crane as an accessory and the crane is used as a simple aerial work vehicle. However, in this configuration, since the verticality of the bucket is maintained only by the weight of the bucket, the bucket oscillates relatively freely due to the wind, the vibration of the boom, and the like, which gives the worker anxiety.

In order to improve this drawback, there has been proposed a structure in which a link mechanism is interposed between the boom and the bucket and the link mechanism is opened and closed by a screw bolt to manually correct the verticality of the bucket. In this mechanism, since the bucket and the boom are connected by the link mechanism, the bucket does not swing and the angle can be freely adjusted by the screw bolt. However,
The screw bolt must be manually rotated to correct the bucket angle, and if the boom elevation angle changes, the screw bolt must be manually rotated, which is a heavy burden on the operator. there were.

[0009]

As described above, there are two ideas for vertically holding the bucket of the conventional work platform for aerial work. The first method is to use a hydraulic cylinder or servo motor to automatically correct the bucket angle by the driving force. The second is a method of using the weight of the bucket without using the driving force or manually correcting the angle of the bucket. In the method using the driving force of the hydraulic cylinder or the like, a hydraulic hose and a power line have to be piped up to the tip of the boom, which has a drawback that the structure is complicated and the weight is heavy. In addition, the method that does not use the driving force has a drawback that the mechanism is simple, but the bucket is not stable and the operator is burdened. In particular, in the latter mechanism, if the bucket rocks and becomes unstable, it will cause a great deal of anxiety to the workers who ride on the bucket, which causes work at high altitudes to not proceed quickly. . As described above, the conventional bucket vertical maintenance mechanism has drawbacks in both the method of using the driving force and the method of not using the driving force. However, there has been a demand for the development of a vertical bucket maintenance that can always keep the bucket vertical.

Therefore, the inventor of the present invention, in an aerial work vehicle in which a bucket on which an operator rides is suspended from the tip of a boom that is lifted up and down, a stabilizing mechanism that always keeps the bucket vertically between the boom and the bucket. I proposed the structure which intervenes. However, in this aerial work vehicle, a fixed gear with a tooth surface formed on the outer periphery is fixed to the tip of the boom, and a driven gear with a tooth surface formed on the outer periphery is fixed to the upper part of the bucket. At all times, the center of rotation of the fixed gear and the center of rotation of the driven gear are rotatably connected by a rocking plate so that they directly mesh, and the outer diameter of the fixed gear and that of the driven gear are made the same so that the driven gear is It was rotated around the outer circumference like a planet and kept the bucket always vertical.

In such an aerial work vehicle, since the fixed gear and the driven gear are always in direct mesh with each other, a rotation restricting mechanism for fixing or releasing the swing of the swing plate between the boom and the swing plate. Therefore, the number of constituent members is increased by the provision of the rotation restricting mechanism, which complicates the structure and requires the operation of fixing or releasing the rocking plate by the rotation restricting mechanism. The present invention intends to provide an aerial work vehicle that does not require such an operation, and has a simple structure with relatively few members and that can reliably and easily maintain the bucket always vertically. To do.

[0012]

According to the present invention, as described in claim 1, in an aerial work vehicle in which a bucket, on which an operator rides, is suspended from the tip of a boom that is vertically elevated, the boom is attached to the tip of the boom. Has a fixed gear with a tooth surface formed on its outer periphery, and a driven gear with a tooth surface formed on the outer periphery is rotatably supported on the upper part of the bucket to oscillate the center of rotation of these fixed gears and the center of rotation of the driven gear. In addition to being rotatably connected by a moving plate, a horizontal rack body having upper rack teeth and lower rack teeth on the upper and lower surfaces is slidably supported on this swing plate, and the upper rack teeth of the rack body are fixed. It is characterized in that the bucket is always kept vertical by engaging the gear and the lower rack tooth with the driven gear.

According to the present invention, in the bucket stabilizing mechanism for an aerial work vehicle according to a first aspect of the present invention, a wire is wound around the outer peripheral side of the fixed gear and both ends of the rack body in the sliding direction. It is characterized in that the fixed gear and the rack body are complementarily connected by a wire along the sliding direction of the rack body.

Further, according to the present invention, in the bucket stabilizing mechanism for an aerial work vehicle according to a first aspect of the present invention, a curved rod-shaped engaging body intersecting the axis is provided in the shaft extension portion of the fixed gear, and the engaging body is racked. It is characterized in that the fixed gear and the rack body are complementarily connected along the sliding direction of the rack body by being inserted into an engaging hole formed in a side edge portion in the tooth width direction of the body.

Further, according to the present invention, in the bucket stabilizing mechanism for an aerial work vehicle according to claim 1, a ring-shaped cam body having a cam surface formed on the inner peripheral side at the tip of the boom is provided as a fixed gear. On the other hand, the rack body is provided with an enclosing body, and at both ends of the rack body in the sliding direction, engaging bodies are provided which are in constant contact with the cam surface of the cam body in a horizontal state. It is characterized in that they are complementarily connected along the sliding direction of the body.

[0016]

In the present invention, since the stabilizing mechanism is interposed between the boom and the bucket, the bucket can always be maintained vertically by the stabilizing mechanism regardless of whether the boom is tilted in the up or down direction. Therefore, the bucket can always be kept vertical without using power such as hydraulic pressure or electricity, and it is possible to reduce the weight without giving unnecessary load to the boom. In addition, the bucket is always vertical regardless of the boom angle, so the workers on the bucket do not feel uneasy.

In particular, in the present invention, the fixed gear fixed to the tip of the boom and the driven gear pivotally supported on the bucket are meshed with each other through the rack body that slides in the horizontal direction. In the case of the turning state, the rack body slides horizontally in accordance with the turning amount, and the driven gear turns in accordance with the moving amount of the rack body, which corresponds to the tilt angle of the boom. The driven gear, that is, the bucket can be rotated at the same angle as the distance. Therefore, the driven gear is rotated so as to correct the tilt angle of the boom, and the bucket can be corrected so as to be always vertical no matter what angle the boom tilts.

In this case, since the turning force from the fixed gear to the driven gear is transmitted via the rack body, the rotating operation for maintaining the vertical state of the bucket is smoothly performed, and after the predetermined rotation. In the bucket stopped state, the bucket stop maintaining force is applied by the sliding resistance due to the horizontal sliding of the rack body and the meshing resistance between the gear and the upper and lower rack teeth, and swinging such as wobbling is prevented. Therefore, an extra rotation restricting mechanism for maintaining the bucket in a vertical position is unnecessary, and the structure can be simplified and the operation can be facilitated.

Further, according to the present invention, a wire is wound around the outer peripheral side of the fixed gear and both ends of the rack body in the sliding direction, and the fixed gear and the rack body are laid along the sliding direction of the rack body with this wire. By supplementarily connecting them, the power transmission between the fixed gear and the rack body can be performed more reliably and smoothly.

Further, according to the present invention, a curved rod-shaped engaging body that intersects with the axis is provided in the axial extension portion of the fixed gear, and the engaging body is inserted into the engaging hole formed in the edge portion in the tooth width direction of the rack body. do it,
By supplementarily connecting the fixed gear and the rack body along the sliding direction of the rack body, power transmission between the fixed gear and the rack body can be performed more reliably and smoothly.

Further, according to the present invention, a ring-shaped cam body having a cam surface formed on the inner peripheral side is provided at the tip of the boom in such a manner as to surround the fixed gear, while the cams are provided at both ends in the sliding direction of the rack body. The cam surface of the body is provided with an engaging body that is always in contact with and engaged in a horizontal state, and the cam body and the engaging body complementarily connect the fixed gear and the rack body along the sliding direction of the rack body to fix the body. The power transmission between the gear and the rack body can be performed even more reliably and smoothly.

[0022]

An embodiment of the present invention will be described below with reference to the drawings.

<First Embodiment (FIGS. 1 to 6)>

This embodiment shows an example in which the present invention is applied to a bending type boom type aerial work vehicle, and FIG. 1 is a perspective view showing the appearance of a boom type aerial work vehicle 10 of the present embodiment. The aerial work vehicle 10 has two booms 22 and 23 that can be folded in the vertical direction, and the booms 22 and 23 can be opened and closed in a dogleg shape. The bucket 25 attached to the tip of the can be moved up and down.

This aerial work vehicle 10 has a vehicle body 1 at the bottom thereof.
The vehicle body 11 is the same as the mechanism of a normal truck, and the body is modified for a special purpose. Front wheels 12 for steering that change the direction are pivotally supported on the left and right sides of the vehicle body 11, and rear wheels 13 that are rotated by a driving force from the engine are pivotally supported on the left and right sides of the rear side of the vehicle body 11. There is. In addition, the front wheels 12 on the front side of the vehicle body 11
The cabin 14 on which the driver rides is placed above
An outrigger 15 that can extend downward is fixed to the rear portion of the vehicle body 11. The aerial work vehicle 10 is a vehicle body 1.
It is possible to move on the road by driving the rear wheels 13 with the engine housed inside 1, and to change the direction by steering the front wheels 12. This structure has the same mechanism as that of a conventionally known truck, and this function allows the work vehicle 10 at high places to be freely moved from a garage or a stationary place to a construction site.

An elevating mechanism 20 is mounted on the upper part of the vehicle body 11 so as to be vertically movable and horizontally rotatable. That is, the vehicle body 11
The carrier is provided with a rotary support 21 that can freely rotate 360 degrees in the horizontal direction with respect to the vehicle body 11. The lower end of an elongated rectangular pipe-shaped lower boom 22 can be vertically swung on the rotary support 21. It is held so that The lower end of the lower boom 22 is similarly connected to the lower end of an elongated rectangular pipe-shaped upper boom 23 so that it can swing up and down, and the upper boom 23 has a "U" -shaped end. The suspended body 24 is connected. The hanging body 24 has a U-shaped center connected to the tip of the upper boom 23, and a combination of the upper boom 23 and the hanging body 24 projects a fork-like structure toward the front. Are formed.

The rotary support 21, the lower boom 22,
The lifting mechanism 20 is formed by the upper boom 23 and the hanging body 24, and the rotation support body 21 rotates horizontally with respect to the vehicle body 11 so that the lifting mechanism 20 as a whole can freely rotate in the horizontal direction. Then, the lower boom 22 swings up and down with respect to the rotary support 21, the upper boom 23 can swing up and down with respect to the lower boom 22, and both the lower boom 22 and the upper boom 23 are "squeezed".
The opening angle can be freely changed by drawing the shape of. By this movement, the position of the hanging body 24 can be freely changed, and the hanging body 24 can freely move its position from a low position to a high position. This configuration has been conventionally known. It is similar to the lifting mechanism 20.

The two opposing sides of the "U" -shaped hanging body 24 are parallel to each other, and the box-shaped bucket 25 is placed in the space of the "U" -shaped hanging body 24. Is located. The bucket 25 has a bucket-like shape with an open upper end and a bottom on the lower surface.
Two opposing sides of the hanging body 24 and the left and right upper edges of the bucket 25 are connected by stabilizing mechanisms 26 and 27, respectively. On the front side of the bucket 25, a square entrance / exit 28 cut downward is formed, and a pipe-shaped safety bar 29 is horizontally arranged so as to connect the left and right ends of the upper end of the entrance / exit 28. It is openable and closable. When the worker enters the bucket 25, the safety bar 29 is opened to open the entrance / exit port 28, and the worker can enter the inside of the bucket 25 by straddling the entrance / exit port 28. After that, when a worker gets on the floor of the bucket 25, the safety bar 29 is bridged between both ends of the entrance / exit 28,
It is possible to prevent the worker from falling.

Next, FIG. 2, FIG. 3, FIG. 4, FIG.
The structure of the stabilizing mechanisms 26 and 27 described above will be described in more detail. This FIG. 2 shows the stabilizing mechanism 26, 27,
FIG. 4 is a perspective view showing the bucket 25, FIG. 3 is a front view of the same, FIG. 4 is a side sectional view in which the vicinity of the center of the bucket 25 is vertically broken, and FIG. 5 is a main member of one stabilizing mechanism 26. It is a disassembled perspective view which decomposed | disassembled. In FIG. 5, only one stabilizing mechanism 26 is described, but the other stabilizing mechanism 27 is symmetrical with the configuration of the stabilizing mechanism 26, and since each member is the same, the illustration thereof is omitted. The description is omitted. FIG. 6 is an explanatory view showing a state in which the upper boom 23 and the hanging body 24 are inclined downward.

As shown in FIG. 2, the above-mentioned hanging body 24 is composed of one original support rod 35 and two side support rods 36 and 37, and each original support rod 35 and side support rods 36 and 3 are provided.
7 is formed in a straight line by a square pipe. The front end of the upper boom 23 is connected to the center rear surface of the original support rod 35, and the original support rod 35 and the upper boom 23 form a T-shaped structure. Then, by connecting one ends of the side support rods 36, 37 to both ends of the original support rod 35 at right angles, the both side support rods 36, 37 are arranged in parallel, and the original support rod 35, the side support rod 36, the side support rod The rod 37 has a U-shaped structure when viewed from above. In this manner, the upper boom 23 and the hanging body 24 form a fork-shaped structure having a large opening toward the front. And, from the tip of the side support rod 36 toward the rear, there is formed an insertion groove 38 which is vertically cut up to about half of its length, and from the tip of the side support rod 37 toward the rear,
Insertion groove 39 cut up and down to about half of its length
Is formed.

Next, the stabilizing mechanism 26 will be described in more detail with reference to FIG.

On the front side of the above-mentioned side support rod 36, fixing holes 44 and 45 are opened from the side surface, and the axes of both fixing holes 44 and 45 are arranged so as to form a straight line.
A key groove 46 is formed in the lower portion of the inner circumference of each of 4, 45.
Further, inside the insertion groove 38 formed in the side support rod 36,
A large-diameter fixed gear 47 having a tooth surface formed on the outer periphery is inserted, a shaft hole 48 is opened at the center of the fixed gear 47, and a key groove 49 is formed in the lower inner periphery of the shaft hole 48. Is formed. Further, the fixed shaft 51 in the shape of an elongated round bar has a function of suspending the stabilizing mechanism 26, and a linear key groove 52 is cut and formed in the length direction thereof. The fixed gear 47 described above is inserted into the insertion groove 38, and the fixed shaft 51 is fixed to the fixing hole 4
The fixed gear 47 is held by the side support rod 36 by inserting the 4, the shaft hole 48, and the fixing hole 45 in this order. Then, the elongated key 50 is inserted so as to mesh with the key grooves 46, 49, 52, and the fixed gear 47 and the fixed shaft 51 are integrally fixed to the side support rod 36 by the key 50.

As described above, when the fixed shaft 51 is inserted into the fixed holes 44 and 45 and the fixed shaft 51 is fixed by the key 50, both ends of the fixed shaft 51 project from both side surfaces of the side support rod 36. Become. The fixed shaft 51 protruding to the left and right of the side support rod 36 has a through hole 5 for the swing plates 54 and 55 from the left and right.
The rocking plates 54 and 55 are held so as to be rotatable about the fixed shaft 51. Each rocking plate 5
Reference numerals 4 and 55 each have a thin and wide shape, for example, a square shape, a through hole 56 is opened in the upper part of the rocking plate 54, and a through hole 58 is opened in the upper part of the rocking plate 55. is there. As described above, the fixed shaft 51 is fixed at the tip of the side support rod 36, and the swing plate 5 is fixed from one end (right side in FIG. 5) of the fixed shaft 51.
4 through hole 56, the other end (left side in FIG. 5)
Through the through hole 58 of the rocking plate 55.
4, 55 are suspended so that they can freely swing back and forth with the fixed shaft 51 as the center of rotation.

A slit-shaped guide hole 61 is horizontally formed at a substantially intermediate position in the up-down direction of the swing plate 54, below the through hole 56 through which the fixed shaft 51 is inserted. Also,
The guide hole 6 is also formed in the other swing plate 55 facing the swing plate 54.
A slit-shaped guide hole 62 is formed in the same height position as the guide hole 61 so as to face the guide hole 1. Edges on both sides of a rack body 63 having a rectangular horizontal substrate are inserted into the guide holes 61 and 62, respectively.
2 can be slid in the longitudinal direction. On the upper side surface of the rack body 63, upper rack teeth 64 are formed along the longitudinal direction, and the upper rack teeth 64 mesh with the fixed gear 47. As a result, when the fixed gear 47 rotates, the upper rack teeth 64 meshing with the fixed gear 47 slide along the horizontal tangential direction to the fixed gear 47, that is, the horizontal direction. It should be noted that both side edges of the rack body 63 in the width direction are provided with both swing plates 5.
A constant sliding resistance is applied to the guide holes 61 and 62 of the holes 45 and 55. Further, a constant sliding resistance is also exerted on the meshing tooth surface between the upper rack tooth 64 and the fixed gear 47.

On the other hand, lower rack teeth 65 are formed on the lower surface of the rack body 63 so as to mesh with the driven gear 71. That is, a through hole 69 is formed below the guide hole 61 of the oscillating plate 54 so as to correspond to the upper through hole 56, and an upper through hole is also provided below the guide hole 62 of the other oscillating plate 55. A through hole 70 is opened in an arrangement corresponding to 58. A large-diameter driven gear 71 having a tooth surface formed on the outer periphery is inserted between the rocking plates 54 and 55 from below. The outer diameter of the driven gear 71 is set to be the same as the outer diameter of the fixed gear 47. A shaft hole 72 is opened through the center shaft of the driven gear 71, and a key groove 73 is formed in the upper portion of the inner periphery of the shaft hole 72.

A slender round rod-shaped swing shaft 75 is inserted in the order of the through hole 69, the shaft hole 72, and the through hole 70. A linear key groove 76 is provided in the length direction of the swing shaft 75. Is formed, and a key 74 is fitted between the key grooves 73 and 76. With this key 74, the driven gear 71 and the swing shaft 7
5, the outer peripheral tooth surface of the driven gear 71 meshes with the tooth surface of the lower rack tooth 65 on the lower side surface of the rack body 63 in a state in which the driven gear 71 is pivotally supported by the swing shaft 75. With this configuration, the driven gear 71 can move the left and right swing plates 54, 55.
Although it is rotatably supported by, the driven gear 71 meshes with the lower rack teeth 65 of the rack body 63 and rotates about the swing shaft 75 when the rack body 63 moves in the horizontal direction.

Further, a disc-shaped holding pedestal 78 is fixed to the upper part of the side surface of the bucket 25 (only the holding pedestal 78 is shown in FIG. 5, but the state fixed to the bucket 25 is shown in FIG. 3). This holding base 78 is shown in FIG.
A shaft hole 79 is opened at the center of the side surface of the shaft hole 7.
A key groove 80 is formed in the upper part of the inner circumference of the groove 9 in the longitudinal direction. One end (the right end in FIG. 5) of the swing shaft 75 is inserted into the shaft hole 79, and a key 81 is engaged and fixed between the key groove 76 and the key groove 80 of the swing shaft 75. is there. In this way, the driven gear 71, the swing shaft 75, and the holding base 78 (and the bucket 25) are integrally fixed,
These three are always regulated to rotate at the same angle.

As described above, only the stabilizing mechanism 26 provided on the side supporting rod 36 has been described, but the stabilizing mechanism 26 has the structure of the stabilizing mechanism 2 provided on the side supporting rod 37.
7 has the same configuration with symmetrical arrangement. For this reason,
In FIG. 2 and FIG. 3, the same numbers as those given to the stabilizing mechanism 26 are given to the corresponding mechanisms of the stabilizing mechanism 27.

Next, the operation of this embodiment will be described.

<< Moving and Fixing the Aerial Work Vehicle 10 >>

In order to move the aerial work vehicle 10 from the garage to the work site, a driver rides in the cabin 14, starts the engine provided in the vehicle body 11, and rotates the engine to the rear wheels 13. Do by telling. Aerial work vehicle 1
When 0 is moving, the driver in the cabin 14 can steer the front wheels 12 to change the traveling direction and freely control the moving direction. When the aerial work vehicle 10 arrives at the intended work site, the vehicle is stopped there and the outrigger 15 is extended to the ground to fix the vehicle body 11 so as not to swing.

<< Boarding of Worker into Bucket 25 >>

In order to perform work at a high place, the bucket 25
The worker must board the vehicle, but in this boarding, the elevating mechanism 20 sets the bucket 25 to the lowermost position, and the safety bar 29 is removed to open the opening of the entrance 28. Bucket 25 so as to straddle this entrance / exit 28
Get inside. When the worker stands on the floor of the bucket 25, return the safety bar 29 so that it is horizontal, and then the entrance 28
The upper opening of the is closed horizontally to prevent workers from falling from the bucket 25.

<< Operation of Lifting Mechanism 20 >>

When the vehicle body 11 is fixed, the hydraulic oil mechanism (not shown) causes the pressure oil to operate each function of the elevating mechanism 20 to elevate the bucket 25. That is, the rotary support 21 is swung in the horizontal direction with respect to the vehicle body 11, the lower boom 22 is elevated to the rotary support 21, and the upper boom 23 is rotated.
Is raised with respect to the lower boom 22, and by adjusting these operations respectively, the suspending body 24 attached to the tip of the upper boom 23 is moved to a height position where work is required. Since the bucket 25 is suspended from the suspension body 24, it is possible to raise the bucket 25 to a height position at which work is required. Such operation of the elevating mechanism 20 is well known in the related art, and an operator who has boarded the bucket 25 can perform maintenance on a wall surface of a building at a high place, a utility pole, a highway, etc. without using a scaffold. Work such as inspection and painting can be performed.

<< Vertical Maintenance by Stabilizing Mechanisms 26 and 27 >>

As described above, when the elevating mechanism 20 is operated and the upper boom 23 is raised, the angle of the upper boom 23 changes greatly from the lower side to the upper side. Therefore, the bucket 25 suspended from the suspending body 24
Will change at the same angle as the angle of the upper boom 23 changes, but the buckets 2 will be changed by the stabilizing mechanisms 26 and 27 interposed between the suspension 24 and the bucket 25.
5 can maintain a vertical posture. The operation of vertically maintaining the bucket 25 by the stabilizing mechanisms 26 and 27 will be described below.

<< Maintaining Vertically by Lowering Operation of Upper Boom 23 >>

The bucket 25 when the upper boom 23 is in a horizontal state as shown in FIG. 4 and the upper boom 23 is tilted downward from the horizontal side as shown by C in FIG. The operation of maintaining the vertical maintenance of the above will be described.

The upper boom 23 faces C downward from the horizontal.
When the operation is inclined in the direction, the suspension 24 integral with the upper boom 23, the side support rods 36 and 37 thereof, and the fixed gear 47 integral with these are rotated in the same direction, that is, the direction D in FIG. become. That is, since the fixed gear 47 is connected to the side support rod 36 by the fixed shaft 51 via the key 50 and the key groove 46, it rotates in the D direction. In this case, the oscillating plates 54 and 55 are rotatable with respect to the fixed shaft 51, but since they receive a rotational force to some extent, the oscillating plates 54 and 55 and the bucket 25 are E if there is no support.
There is a possibility of swinging randomly in the front-back direction under the force of the direction.

However, in the present embodiment, the fixed rack 47 is meshed with the upper rack teeth 64 of the rack body 63, and the lower rack teeth 65 of the rack body 63 is meshed with the driven gear 71, which is in the F direction opposite to the fixed gear 47. It is designed to be powered by. Then, the turning force of the fixed gear 47 is the swing plates 54, 55.
Is a force for rotating the driven gear 71 in the D direction, while the rotational force of the driven gear 71 is a force for rotating the bucket 25 connected thereto via the swing shaft 75 in the F direction opposite to the D direction. Therefore, the oscillating plates 54 and 55 and the bucket 25 are always held stationary by the turning force on the opposite side. That is, the bucket 25 is always maintained in the vertical state by its own weight.

Moreover, since the fixed gear 47 and the driven gear 71 mesh with each other via the upper rack teeth 64 and the lower rack teeth 65 of the rack body 63 while moving in the horizontal direction, the fixed gear 4
7 and the driven gear 71 are directly meshed with each other to rotate the driven gear 71 in a planetary manner, the meshing operation is smoothly and surely performed by interlocking only with the lateral force.

<< Fixation of Bucket 25 Position and Vertical Maintenance >>

In this way, even if the upper boom 23 tilts downward, the bucket 25 is always maintained vertically, and the worker riding on the bucket 25 does not feel uneasy. When the upper boom 23 is operated and the bucket 25 is moved to a predetermined position for working, the worker on the vehicle body 11 side stops the operation of the elevating mechanism 20 and stops the bucket 25 at the aerial position. . And the rack body 6
Since 3 is slidably supported between the rocking plates 54 and 55 and the guide holes 61 and 62, some frictional force is generated. In this state, the bucket 25 is maintained in a substantially vertical state by its own weight. Therefore, even if a worker in the bucket 25 vibrates due to work at a high place, the bucket 25 may shake. Lost.

<Second Embodiment (FIGS. 7 and 8)>

In this embodiment, the fixed gear 47, the rack body 63, and the driven gear 71 are more securely engaged with each other as compared with the first embodiment. FIG. 7 is a side view showing a part of the stabilizing mechanism 26, and FIG. 8 shows one of the stabilizing mechanisms 27, particularly the fixed gear 47 and the rack body 6.
It is an exploded perspective view which extracted and showed the connection with 3. In addition,
7 and 8, only one stabilizing mechanism 27 is described, but the other stabilizing mechanism 26 is symmetrical to the configuration of this stabilizing mechanism 27, and since each member is the same, Illustration and description are omitted. Further, the overall configuration according to this embodiment is almost the same as that of the first embodiment, and the description thereof will be omitted.

In this embodiment, as shown in FIG. 7, a fixed gear 47 having a tooth surface formed on the outer periphery is fixed to the tip of the side support 37, and a driven wheel having a tooth surface formed on the outer periphery is attached to the upper portion of the bucket 25. The gear 71 is rotatably supported, and the center of rotation of the fixed gear 47 and the center of rotation of the driven gear 71 are set on the rocking plate 54 (see FIG. 7).
Then, the rocking plate 55 is omitted). A horizontal rack body 63 having upper rack teeth 64 and lower rack teeth 65 on the upper and lower surfaces thereof is slidably supported on the swing plate 54, and the rack body 6 is supported.
The upper rack tooth 64 and the lower rack tooth 65 are meshed with the fixed gear 47 and the driven gear 71, respectively, so that the bucket 25 is always kept vertical. Then, the wire 91 is laid across the outer peripheral side of the fixed gear 47 and both ends of the rack body 63 in the sliding direction,
The wire 91 additionally connects the fixed gear 47 and the rack body 63 along the sliding direction of the rack body 63. The wire 91 is assumed to include various cords such as chains.

FIG. 8 shows in detail the spanning structure of the wire 91 and the gear mechanism therefor. As shown in FIG. 8, the tooth surface of the fixed gear 47 is 2 in the circumferential direction.
A groove 96 for a pulley is formed between the two tooth surfaces 92, 93 which are divided into two. On the other hand, the tooth surface of the rack body 63 is also divided into two in the tooth width direction, and a groove 97 is also formed between the two divided tooth surfaces 94 and 95.
The wire 91 is wound around the groove 96 of the fixed gear 47 from the upper side, intersects with the lower side, is guided to the groove 97 of the rack body 63, and is fixed to both ends of the rack body 63 in the sliding direction. Since the other structures are substantially the same as those in the first embodiment, the corresponding parts in FIGS. 7 and 8 are designated by the same reference numerals as those in the first embodiment and the description thereof is omitted.

According to this embodiment, the wires 91 are provided on the outer peripheral side of the fixed gear 47 and both ends of the rack body 63 in the sliding direction.
The fixed gear 47 and the rack body 63 are complementarily connected by the wire 91 along the sliding direction of the rack body 63, so that the power between the fixed gear 47 and the rack body 63 is increased. The transmission can be performed more reliably and smoothly. Therefore, according to the present embodiment, the rotation of the rack body 63 for transmitting the turning force from the fixed gear 47 to the driven gear 71 is further ensured, and the rotation operation for maintaining the vertical state of the bucket 25 is also performed. It will be done smoothly. At the same time, even when the bucket is stopped after the predetermined rotation, the rack body 63
Sliding resistance due to the horizontal slide of each gear 47,
71 and the upper and lower rack teeth 64 and 65, and the winding resistance of the wire 91.

<Third Embodiment (FIGS. 9 to 12)>

In this embodiment, the fixed gear 47, the rack body 63 and the driven gear 7 are arranged by means different from the second embodiment.
FIG. 9 is a front view showing the stabilizing mechanisms 26 and 27, FIG. 10 is a side view partially omitted, and FIG. 11 is one stabilizing mechanism. FIG. 26 is an exploded perspective view showing 26. In FIG. 11, only one stabilizing mechanism 27 is described, but the stabilizing mechanism 26 on the other side is symmetrical to the configuration of the stabilizing mechanism 27,
Since each member is the same, its illustration and description are omitted. FIG. 12 is a side view for explaining the action when the upper boom 23 is rotated. The overall structure of this embodiment is almost the same as that of the first embodiment, and the description thereof is omitted.

In this embodiment, as shown in FIGS.
A fixed gear 47 having a tooth surface formed on the outer periphery is fixed to the tips of the side supports 36 and 37, and a driven gear 71 having a tooth surface formed on the outer periphery is rotatably supported on the upper portion of the bucket 25. The center of rotation of the gear 47 and the center of rotation of the driven gear 71 are rotatably connected by rocking plates 54 and 55. A horizontal rack body 63 having upper rack teeth 64 and lower rack teeth 65 on the upper and lower surfaces thereof is slidably supported on the swing plates 54 and 55, respectively. The upper rack teeth 64 of the rack body 63 are meshed with the fixed gear 47, and the lower rack teeth 65 are meshed with the driven gear 71, so that the bucket 25 is always kept vertical. And the fixed gear 4
Curved rod-shaped engaging body 106 intersecting the axis at the axis extension portion of 7
Is provided, and the engaging body 106 is inserted into the engaging hole 107 formed in the side edge portion of the rack body 63 in the tooth width direction, and the fixed gear 47 is inserted.
And the rack body 63 are complementarily connected to each other along the sliding direction of the rack body 63.

That is, as shown in FIG. 11, the fixed shaft 51
A large-diameter, collar-shaped holder 105 is fitted and fixed to the shaft end of the shaft so that it can rotate integrally with the fixed shaft 51. The holder 105 has the fixed shaft 5 in the through hole 58 of the swing plate 55.
When 1 is inserted from the outside, the through hole 58 is not penetrated, but it is arranged outside the oscillating plate 55. One end of a curved rod-shaped engaging body 106 is inserted and fixed to the holder 105. The degree of bending of the engagement body 106 is set so that the tip end portion, which is the other end side of the engagement body 106, always keeps downward in a constant rotation range associated with the fixed shaft 51. On the other hand, one side edge portion of the rack body 63 in the width direction overhangs more than the other, and largely projects outward from the guide hole 62. An engaging hole 107 is formed in the protruding portion of the rack body 63 so as to penetrate in the vertical direction, and the engaging body 106 is always inserted into the engaging hole 107.

In the present embodiment, it is assumed that the upper boom 23, and thus the side supports 36, 37, rise from the horizontal state in the upward direction G, as shown in FIG. In this case, as shown in FIG. 12, the fixed gear 47 rotates in the H direction, and accordingly, the engagement body 106 rotates in the same direction via the fixed shaft 51 and the holder 105. Then, the rack body 63 receives the pushing force of the engagement body 106 through the engagement hole 107 and moves in the I direction. This action causes the rack body 63 to move in the I direction at the same time by the engagement of the fixed gear 47 and the upper rack teeth 64 of the rack body 63. Therefore, according to this embodiment, the second
Similar to the embodiment, the rotation of the rack body 63 for transmitting the turning force from the fixed gear 47 to the driven gear 71 is further ensured, and the rotation operation for maintaining the vertical state of the bucket 25 is smoothly performed. Even when the bucket is stopped after a predetermined rotation, the sliding resistance of the rack body 63 due to the horizontal slide, the gears 47 and 71, and the upper and lower rack teeth 64 and 65.
Engagement resistance with the engagement body 106 and the engagement hole 107.
It will be strengthened by resistance etc.

<Fourth Embodiment (FIGS. 13 to 16)>

This embodiment is based on the second and third embodiments described above.
The gearing of the fixed gear 47, the rack body 63, and the driven gear 71 is further ensured by another means different from the embodiment. FIG. 13 is a front view showing the stabilizing mechanisms 26 and 27, and FIG. FIG. 15 is a side view partially omitted, and FIG. 15 is an exploded perspective view showing one stabilizing mechanism 26. In FIG. 15, only one stabilizing mechanism 26 is described, but the other stabilizing mechanism 27 is the stabilizing mechanism 2 only.
Since it is symmetrical with the configuration of FIG. 6 and each member is the same, its illustration and description are omitted. FIG. 16 is a side view illustrating the operation when the boom is rotated. The overall structure of this embodiment is substantially the same as that of the first embodiment,
The description is omitted.

In this embodiment, as shown in FIGS. 13 to 15, fixed gears 47 having tooth surfaces formed on the outer circumference are fixed to the tips of the side supports 36 and 37, and teeth are formed on the outer circumference on the upper portion of the bucket 25. A driven gear 71 having a surface is rotatably supported, and the center of rotation of the fixed gear 47 and the center of rotation of the driven gear 71 are rotatably connected by rocking plates 54 and 55. A horizontal rack body 63 having upper rack teeth 64 and lower rack teeth 65 on the upper and lower surfaces thereof is slidably supported on the swing plates 54 and 55, and the upper rack teeth 64 of the rack body 63 are fixed gears. 47 and the lower rack tooth 65 are meshed with the driven gear 71, respectively, so that the bucket 25 is always kept vertical. A ring-shaped cam body 120 having a cam surface 121 formed on the inner peripheral side is provided at the tip of the boom so as to surround the fixed gear 47. The cam body 1 is provided at both ends of the rack body 63 in the sliding direction.
Engagement bodies 123 and 124 that are always in horizontal contact with each other are provided on the cam surface 121 of 20. The fixed gear 47 and the rack body 63 are moved in the sliding direction of the rack body 63 by the cam bodies 120 and the engagement bodies 123 and 124. It is connected supplementally along.

That is, in this embodiment, as shown in FIG. 15, the outer end of the side support rod 36 is formed in a ring shape, and the cam surface 121 having an arcuate locus is formed on the inner peripheral surface thereof. This cam surface 121 is a rack body 63 of a fixed length.
The engaging bodies 123, 124 provided at both ends of the side support locus are always in a horizontal position in the range in which the side support rod 36 is raised. In addition, the inner tip of the side support rod 36 is the protrusion 1 for the bearing.
Unlike the above-described embodiments, each of the bearing projections 118 has a fixing hole 125 for inserting and supporting the fixed shaft 51 and a key groove 12 for inserting the key 127.
6 is provided so that the fixed shaft 51 is integrally and rotatably supported only by the bearing protrusion 118. The engagement bodies 123 and 124 are configured by rollers or the like that are provided in parallel with each other at both ends of the rack body 63 in the sliding direction. And FIG. 13 and FIG.
As shown in FIG. 5, the engaging bodies 123 and 124 at both ends of the rack body 63 which is always horizontal are slidably abuttingly engaged with the cam surface 121 of the cam body 120 at the same height position.

In the fourth embodiment as described above, it is assumed that the side supports 36, 37 are raised from the horizontal state in the downward direction K, as shown in FIG. In this case,
As shown in FIG. 6, the fixed gear 47 rotates in the L direction, and the cam body 120 rotates in the same direction accordingly, and the engaging bodies 123 and 124 are provided on the front and rear portions of the cam surface 121 of the cam body 120. Engage while maintaining the same height. As a result, the rack body 63 moves in the M direction. This action is achieved by the fixed gear 47 and the upper rack teeth 64 of the rack body 63.
This is performed at the same time that the rack body 63 moves in the M direction due to the meshing with the. The driven gear 71 is the rack 6
It engages with the lower rack teeth 65 from 3 and rotates in the N direction. Therefore, according to this embodiment, the second,
Similar to the third embodiment, the rotation of the rack body 63 for transmitting the rotational force from the fixed gear 47 to the driven gear 71 is further ensured, and the rotation operation for maintaining the vertical state of the bucket 25 is smooth. Done in. At the same time, even when the bucket is stopped after a predetermined rotation, the sliding resistance of the rack body 63 due to the horizontal slide, the gears 47 and 71, and the upper and lower rack teeth 64 and 6 are generated.
5 and the contact resistance between the cam body 120 and the engaging bodies 123 and 124.

[0070]

As described above, according to the present invention, since the stabilizing mechanism is interposed between the boom and the bucket, the bucket is provided with the stabilizing mechanism regardless of whether the boom is tilted in the up or down direction. Can be kept vertical at all times. Therefore, the bucket can always be kept vertical without using power such as hydraulic pressure or electricity, and it is possible to reduce the weight without giving unnecessary load to the boom. In addition, the bucket is always vertical regardless of the boom angle, so the workers on the bucket do not feel uneasy.

Particularly in the present invention, the fixed gear fixed to the tip of the boom and the driven gear pivotally supported on the bucket are meshed with each other through the rack body that slides in the horizontal direction. When in the rotating state, the rack body slides horizontally in accordance with the rotation amount, and the driven gear rotates in accordance with the movement amount of the rack body, which corresponds to the tilt angle of the boom. The driven gear, that is, the bucket can be rotated at the same angle as the distance. Therefore, the driven gear is rotated so as to correct the tilt angle of the boom, and the bucket can be corrected so as to be always vertical no matter what angle the boom tilts.

In this case, since the turning force from the fixed gear to the driven gear is transmitted through the rack body, the rotating operation for maintaining the vertical state of the bucket is smoothly performed, and after the predetermined rotation. In the bucket stopped state, the bucket stop maintaining force is applied by the sliding resistance due to the horizontal sliding of the rack body and the meshing resistance between the gear and the upper and lower rack teeth, and swinging such as wobbling is prevented. Therefore, an extra rotation restricting mechanism for maintaining the bucket in a vertical position is unnecessary, and the structure can be simplified and the operation can be facilitated.

Further, in the present invention, a wire is laid around the outer peripheral side of the fixed gear and both ends of the rack body in the sliding direction, and the fixed gear and the rack body are laid along the sliding direction of the rack body with this wire. By supplementarily connecting them, the power transmission between the fixed gear and the rack body can be performed more reliably and smoothly.

Further, in the present invention, a curved rod-shaped engaging body intersecting the axis is provided in the axial extension portion of the fixed gear, and the engaging body is inserted into the engaging hole formed in the side edge of the rack body in the tooth width direction. hand,
By supplementarily connecting the fixed gear and the rack body along the sliding direction of the rack body, power transmission between the fixed gear and the rack body can be performed more reliably and smoothly.

Furthermore, according to the present invention, a ring-shaped cam body having a cam surface formed on the inner peripheral side is provided at the tip of the boom so as to surround the fixed gear, while cams are provided at both ends in the sliding direction of the rack body. The cam surface of the body is provided with an engaging body that is always in contact with and engaged in a horizontal state, and the cam body and the engaging body complementarily connect the fixed gear and the rack body along the sliding direction of the rack body to fix the body. The power transmission between the gear and the rack body can be performed even more reliably and smoothly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall appearance of an aerial work vehicle equipped with a bucket stabilizing mechanism according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a state in which the bucket is suspended by the suspension body by the bucket stabilizing mechanism according to the first embodiment of the present invention.

FIG. 3 is a front view showing a state where the bucket is hung on the hanging body by the bucket stabilizing mechanism according to the first embodiment of the present invention.

FIG. 4 is a side view showing a state in which the bucket is hung on the hanging body by the bucket stabilizing mechanism according to the first embodiment of the present invention.

FIG. 5 is an exploded perspective view showing the components of the bucket stabilizing mechanism according to the first embodiment of the present invention in an exploded manner.

FIG. 6 is a vertical cross-sectional view showing a state in which the upper boom is tilted downward to explain the operation of the bucket stabilizing mechanism according to the first embodiment of the present invention.

FIG. 7 is a side view showing a second embodiment of the bucket stabilizing mechanism of the present invention.

FIG. 8 is an exploded perspective view showing components of the bucket stabilizing mechanism according to the first embodiment of the present invention in an exploded manner.

FIG. 9 is a front view showing a third embodiment of the bucket stabilizing mechanism of the present invention.

FIG. 10 is a side view showing a third embodiment of the bucket stabilizing mechanism of the present invention.

FIG. 11 is an exploded perspective view showing components of the bucket stabilizing mechanism according to the third embodiment of the present invention in a disassembled state.

FIG. 12 is a vertical cross-sectional view showing a state in which the upper boom is tilted upward in order to explain the operation of the bucket stabilizing mechanism according to the third embodiment of the present invention.

FIG. 13 is a front view showing a fourth embodiment of the bucket stabilizing mechanism of the present invention.

FIG. 14 is a side view showing a fourth embodiment of the bucket stabilizing mechanism of the present invention.

FIG. 15 is an exploded perspective view showing the components of the bucket stabilizing mechanism according to the fourth embodiment of the present invention in an exploded manner.

FIG. 16 is a vertical cross-sectional view showing a state in which the upper boom is tilted downward to explain the operation of the bucket stabilizing mechanism according to the fourth embodiment of the present invention.

[Explanation of symbols]

 10 Work vehicle 20 Elevating mechanism 23 Upper boom 24 Suspended body 25 Bucket 26 Stabilizing mechanism 27 Stabilizing mechanism 36 Side support rod 47 Fixed gear 51 Fixed shaft 54 Swing plate 55 Swing plate 61 Guide hole 62 Guide hole 63 Rack body 64 Upper rack tooth 65 Lower rack tooth 71 Driven gear 75 Swing shaft 91 Wire 105 Holder 106 Engaging body 107 Engaging hole 120 Cam body 121 Cam surface 123 Engaging body 124 Engaging body

Claims (4)

[Claims] 1. In an aerial work vehicle in which a bucket on which an operator rides is suspended at the tip of a boom that is elevated up and down, a fixed gear having a toothed surface on the outer periphery is fixed to the tip of the boom, and the upper part of the bucket is fixed. A driven gear having a tooth surface on its outer periphery is rotatably supported on the shaft, and the rotation center of these fixed gears and the rotation center of the driven gear are rotatably connected by a rocking plate. A horizontal rack body having upper rack teeth and lower rack teeth on the upper and lower surfaces is slidably supported, and the upper rack teeth of the rack body are meshed with a fixed gear and the lower rack teeth are meshed with a driven gear. A bucket stabilization mechanism for aerial work vehicles, characterized in that it is maintained vertically. 2. The bucket stabilizing mechanism for an aerial work vehicle according to claim 1, wherein a wire is laid on the outer peripheral side of the fixed gear and both ends of the rack body in the sliding direction, and the fixed gear is fixed by the wire. A bucket stabilizing mechanism for an aerial work vehicle, characterized in that the rack and the rack body are complementarily connected to each other along the sliding direction of the rack body. 3. The bucket stabilizing mechanism for an aerial work vehicle according to claim 1, wherein a curved rod-shaped engaging body that intersects with the axis is provided in the axial extension portion of the fixed gear, and the engaging body is provided with the tooth width of the rack body. A bucket stabilizing mechanism for an aerial work vehicle, characterized in that the fixed gear and the rack body are complementarily coupled to each other along the sliding direction of the rack body by being inserted into an engagement hole formed in a side edge portion in the direction side. 4. The bucket stabilizing mechanism for an aerial work vehicle according to claim 1, wherein a ring-shaped cam body having a cam surface formed on the inner peripheral side is provided at the tip of the boom so as to surround the fixed gear. , Both ends of the rack body in the sliding direction are provided with engaging bodies that are in constant contact with the cam surface of the cam body in a horizontal state, and the fixed gear and the rack body are moved in the sliding direction of the rack body by these cam bodies and the engaging bodies. A bucket stabilization mechanism for aerial work vehicles, characterized by being supplementarily connected along the line.