Work equipment

Abstract

To provide a counterweight which can achieve an appropriate weight balance of a vehicle body, and a work machine having the counterweight.SOLUTION: A counterweight U includes: a movable stage which can move on a rail; a weight U2 placed on the movable stage; and a case U7 positioned below the rail and moved below the rail in cooperation with the movable stage. The case U7 includes: an actuator as a drive source for moving the movable stage with one end connected to the case U7; a first chain to which the other end of the actuator is connected and arranged so as to enable a circulating drive by a drive of the actuator; a first sprocket which is rotatable by the circulating drive of the first chain; and a second chain for moving the case U7 by a rotation of the first sprocket.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a counterweight and a working machine equipped with a counterweight.

Background Art

[0002] A working device including boom means that can project outward in the vehicle width direction of a vehicle having a loading platform, a base frame that supports the base end portion thereof, and a working machine supported at the tip end portion of the boom means is disclosed in Patent Document 1. This working device is configured such that the base frame can be detachably attached to the loading platform of the vehicle. Further, Patent Document 2 discloses a truck-mounted grass mower / tree pruning machine including a front-rear moving frame, a left-right moving frame, and an up-down moving frame that are installed on the loading platform of the traveling vehicle and can stroke-move in the front-rear, left-right, and up-down directions, and further including a pruning unit held by a rotating frame that can rotate with respect to the up-down moving frame. And it is said that a counterweight for taking the weight balance between the device main body and the vehicle body is mounted on the loading platform of the traveling vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] According to Patent Document 1, "Vehicle-Mounted Boom-Type Work Device," during grass cutting, the boom mechanism is bent to bring the grass cutter into contact with the work surface such as the roadside, embankment, or field path, and the truck vehicle is made to move slowly. At this time, the grass cutter, which is positioned to the side of the vehicle by the boom mechanism, causes a deterioration in the left-right balance with the vehicle, thus worsening the vehicle's stability. Furthermore, when the grass cutting work is completed, the boom mechanism and grass cutter are stored in the rear of the truck bed. However, if the center of gravity of the entire device on the truck bed is not properly formed when stored, the stability of the vehicle will be compromised. Patent Document 2, "Truck-Mounted Grass Trimmer / Tree Pruner," states that a counterweight stabilizes the posture of the truck-mounted grass trimmer / tree pruner during operation. However, the position of the counterweight must be adjusted according to the amount of extension of the left and right moving frame, and the operator cannot properly manage this amount. Furthermore, there is no mention of the stability of the vehicle when not in operation.

[0005] This invention was made in view of the above-mentioned problems, and aims to provide a counterweight and a work machine equipped with a counterweight that can properly form the weight balance of a vehicle. [Means for solving the problem]

[0006] This invention is A movable platform that can move along rails, A weight to be placed on the aforementioned movable platform, It comprises a case located below the rail, which is integrated with the movable base and moves below the rail, The case includes an actuator, which is a drive source for moving the movable base, with one end of the case connected to the case, The other end of the actuator is connected to a first chain, which is arranged to be able to rotate around the actuator when it is driven, A sprocket made rotatable by the circumferential drive of the first chain, The rotation of the sprocket moves the case, and a second chain moves the case. A counterweight characterized by having, It relates to.

[0007] This invention further, The aforementioned case is provided in a rectangular shape having a short side and a long side in a plan view. The aforementioned weights, in a plan view, have substantially the same projected area as the case and are composed of multiple weights that can be stacked vertically. The actuator is a cylinder arranged to extend and retract in the direction of the long side of the case, The case moves along the lower side of the rail so as to move in the direction of the shorter side of the case by the drive of the actuator, and the case's movement speed is set to be faster than the drive speed of the actuator. A counterweight characterized by, It relates to.

[0008] This invention further, The actuator has an operating unit with a changeover switch that can switch between an attitude-linked mode and an independent operation mode, The rail is equipped with a tilt sensor capable of detecting the inclination of the rail in the longitudinal direction, When the operation mode is switched to the attitude-linked mode, the control unit drives the actuator so that when the rail is tilted, the movable base and case move upward in the direction of the rail's inclination, A counterweight characterized by having, It relates to.

[0009] This invention further, A counterweight characterized by moving when it detects the tilt of the cargo bed. It relates to.

[0010] This invention further, A counterweight characterized by moving to the opposite side of the direction of movement of the work unit when it detects the tilt of the loading platform. It relates to.

[0011] This invention relates to a movable table that can move on a rail, a weight loaded on the movable table, and a case that is located below the rail and is integrated with the movable table to move below the rail. The case includes an actuator that is a drive source for moving the movable table connected to one end side of the case, a first chain to which the other end side of the actuator is connected and is arranged to be capable of circular driving by the driving of the actuator, a sprocket that is rotatable by the circular driving of the first chain, and a second chain that moves the case by the rotation of the sprocket. The working machine is provided with a counterweight having the above, a table frame loaded on the loading platform of the vehicle and on the front side of the loading platform, a mast frame that can swing horizontally with respect to the table frame, a telescopic means provided to be vertically swingable by connecting one end side to the mast frame, and a working part provided on the other end side of the telescopic means. The working part can change its posture to a deployed state in which the working part is positioned on the side of one side of the traveling direction of the vehicle by swinging the mast frame and the telescopic means, and a stored state in which the working part is positioned on the loading platform by swinging the mast frame and the telescopic means. The counterweight is loaded on the rear side of the loading platform and on the side opposite to the side in which the working part in the deployed state expands. A working machine provided with a counterweight, characterized by the above. It relates to the above.

[0012] This invention further relates to the case is provided in a rectangular shape having short sides and long sides in plan view, The aforementioned weights, in a plan view, have substantially the same projected area as the case and are composed of multiple weights that can be stacked vertically. The actuator is a cylinder arranged to extend and retract in the direction of the long side of the case, The case moves along the lower side of the rail so as to move in the direction of the shorter side of the case by the drive of the actuator, and the case's movement speed is set to be faster than the drive speed of the actuator. A work machine equipped with a counterweight, characterized by the following: It relates to.

[0013] This invention further, The actuator has an operating unit with a changeover switch that can switch between an attitude-linked mode and an independent operation mode, The rail is equipped with a tilt sensor capable of detecting the inclination of the rail in the longitudinal direction, When the operation mode is switched to the attitude-linked mode, the control unit drives the actuator so that when the rail is tilted, the movable base and case move upward in the direction of the rail's inclination, A work machine equipped with a counterweight, characterized by having the following features: It relates to.

[0014] This invention further, A work machine equipped with a counterweight that moves when it detects the tilt of the loading platform. It relates to.

[0015] This invention further, A work machine equipped with a counterweight, characterized by moving the counterweight in the opposite direction to the direction of movement of the work unit when it detects the tilt of the loading platform. It relates to.

[0016] This invention further, A work machine equipped with a counterweight, characterized by having the work section and the blower installed at a distance from each other. It relates to. [Effects of the Invention]

[0017] This invention can achieve the objective of providing a counterweight and a work machine equipped with a counterweight that can properly form the weight balance of a vehicle. [Brief explanation of the drawing]

[0018] [Figure 1] This is a side view of a work machine according to an embodiment of the present invention. The work unit is in the retracted state. The tailgate on the left side in the direction of vehicle travel is omitted from the illustration. The binding members are omitted from the illustration. [Figure 2] This is a plan view of a work machine according to an embodiment of the present invention. The work unit is in the retracted state. The weight is positioned towards the center of the vehicle body. [Figure 3] This is a rear view of a work machine according to an embodiment of the present invention. The work unit is in the retracted state. The work machine mounted on a vehicle is shown in a cross-sectional view of the vehicle. [Figure 4] This is a side view of a work machine according to an embodiment of the present invention. The work section is in the deployed state. The tailgate on the left side in the direction of vehicle travel is omitted from the illustration. The binding members are omitted from the illustration. [Figure 5] This is a plan view of a work machine according to an embodiment of the present invention. The work section is in the unfolded state. The weight is positioned to the right of the vehicle in the direction of travel. [Figure 6] This is a rear view of a work machine according to an embodiment of the present invention. The work section is in an unfolded state. This is a cross-sectional view showing the work machine section mounted on a vehicle, illustrating an example of the unfolded state. [Figure 7] This is a rear view of a work machine according to an embodiment of the present invention. This rear view shows the blower mounted on a vehicle. The rear tailgate is partially cut out to represent the machine. [Figure 8] This is an enlarged view of the main part of a work machine according to an embodiment of this invention. This is an enlarged view of the left side in the direction of travel of the nozzle section in which the blower is mounted on the vehicle. The cargo bed and rear tailgate are shown in cross-section. [Figure 9] This is an enlarged view of the main part of the work machine according to an embodiment of this invention. This is an enlarged rear view of the nozzle section in which the blower is mounted on a vehicle. [Figure 10] This is a rear view of a work machine according to an embodiment of the present invention. It shows the counterweight mounted on the vehicle. The rear tailgate is omitted from the illustration. The weight is shown in a state where it has moved to the right side in the direction of travel. [Figure 11] This is an enlarged rear view of a work machine according to an embodiment of the present invention. This is an enlarged cross-sectional view of the main part in a state where the counterweight has moved to the right side in the direction of travel. [Figure 12] This is an enlarged side view of a work machine according to an embodiment of this invention. It shows an enlarged view of the left side of the main part in the direction of travel, with the counterweight moved to the right side in the direction of travel. [Figure 13] This is an enlarged bottom view of a work machine according to an embodiment of this invention. The counterweight is in a state where it has moved to the right in the direction of travel, and this is an enlarged view of the part related to the movement drive of the weight. [Figure 14] This is an enlarged left side view of the first sensor section of a work machine according to an embodiment of the present invention. [Figure 15] This is an enlarged rear view of the first sensor section of the work machine according to an embodiment of the present invention. [Figure 16] This is a plan view enlarged of the first sensor section of a work machine according to an embodiment of the present invention. [Figure 17] This is an enlarged rear view of the operating section of the counterweight of a work machine according to an embodiment of the present invention. [Figure 18] This is a hydraulic circuit diagram of a work machine according to an embodiment of the present invention. It shows a hydraulic circuit diagram related to the drive of the blower. The first switching valve is shown in the state where it has been switched to the second switching block. [Figure 19] This is a rear view showing the operation of the work machine according to an embodiment of this invention. The operation is horizontal. [Figure 20] This is a rear view showing the operation of a work machine according to an embodiment of this invention. The operation is an upward tilting operation. [Figure 21] This is a rear view showing the operation of a work machine according to an embodiment of this invention. The operation is a downward inclined operation. [Modes for carrying out the invention]

[0019] A working machine A according to an embodiment of this invention will be described with reference to the drawings. (Summary of the invention) The implement A according to an embodiment of this invention is detachably mounted on the cargo bed G of a vehicle B such as a truck, and cuts grass and other vegetation located to the side of the moving vehicle B. The implement A has a frame D positioned on the cargo bed G and an extendable mechanism F consisting of multiple booms, and a work section C for cutting grass and other vegetation at the tip of the extendable mechanism F. The work unit C can be moved between a stowed state, where the telescopic mechanism F and the work unit C are positioned on the cargo bed G, and an unfolded state, where the work unit C is positioned to the side of the vehicle B, by rotating the telescopic mechanism F. In the unfolded state, the work unit C can be positioned at any location to the side of the vehicle B by rotating the telescopic mechanism F, allowing for grass cutting work. Furthermore, the implement A according to this embodiment of the invention can remove foreign matter, such as cut grass, from the work surface by discharging an airflow generated by a blower H from a nozzle J1.

[0020] The blower H is positioned behind the frame D, with a gap between it and the work section C. Therefore, the grass cut by the work section C can be blown off the work surface after work by blowing air from the nozzle J1 located at the rear of the cargo bed G, especially at the very rear of vehicle B, thereby blowing away any foreign matter on the work surface to the side. The work machine A, in particular the telescopic means F and the work section C, can be removed from the cargo bed G of vehicle B along with the frame D, and the blower H and nozzle J1, etc., can also be easily attached to and detached from the cargo bed G, so vehicle B can be used as a normal cargo vehicle. In other words, since vehicle B can be easily changed between vehicle B with work machine A and cargo vehicle B, an improvement in the operating rate of vehicle B itself can be expected. Therefore, in this embodiment of the invention, grass cutting work can be performed with a minimum number of personnel. Furthermore, the work machine A according to this embodiment of the invention is equipped with a counterweight U. Therefore, even in the deployed state with the work section C positioned to the side of the vehicle B, it is possible to properly balance the weight of the vehicle. In the examples, the left side of the page shown in Figure 1 will be described as the front, and the right side of the page shown in Figure 1 will be described as the rear. Also, the upper side of the page shown in Figure 1 will be described as the up, and the lower side of the page shown in Figure 1 will be described as the down. Furthermore, the upper side of the page shown in Figure 2 will be described as the right side with respect to the direction of travel, and the lower side of the page shown in Figure 2 will be described as the left side with respect to the direction of travel.

[0021] Vehicle B will now be described. In this embodiment of the invention, vehicle B is a flatbed cargo vehicle B having a cargo bed G, and the vehicle size of cargo vehicle B used in this embodiment is a so-called 2-ton truck. Of course, it is also possible to use a vehicle size other than that of the cargo vehicle exemplified. The cargo bed G has three sides, the sides and the rear, with tailgates 21 to prevent the cargo from falling. The rear tailgate is denoted as 211, and the two side tailgates flanking the rear tailgate 211 are denoted as 212. In this embodiment, the height of the tailgates 21 is assumed to be the same on all three sides. B1 is the cabin of vehicle B. The cabin B1, located at the front of vehicle B, houses worker B2 and the driver, worker B3. Worker B2 operates the control unit V. In this embodiment, vehicle B performs grass cutting while moving forward, towards cabin B1.

[0022] The dimensions of vehicle B and cargo bed G shown in Figure 5 are as follows. Note that the dimensions shown below are examples, and the present invention is not limited to these dimensional relationships. L1 Vehicle length: 5.98m L2 loading platform total length 4.35m W1 Vehicle width: 1.95m W2 Total width of cargo bed: 1.85m

[0023] Let me explain frame D. The frame D can be detachably loaded onto the cargo bed G of vehicle B and on the front side of cargo bed G. The frame D is a component made by combining long pieces of material in a grid pattern. The frame D has a ground contact portion D1 that makes contact with the cargo bed G, a fixing portion D3 that is fixed to the cargo bed G, and a support portion D2 that supports the mast frame E and the telescopic means F. The ground contact point D1 is positioned on the front side of the cargo bed G. The fixing point D3 is positioned above the ground contact point D1 on the side in the direction of travel, with its upper part higher than the upper end of the tailgate 21. The frame D is firmly secured to the cargo bed G by binding members D4 such as ropes, chains, turnbuckles, and cargo securing devices between the fixing point D3 and the tailgate 21 or cargo bed G. In this embodiment, multiple binding members D4 are used to secure the frame to the side tailgates 211 on both sides. The support point D2 is provided at the front end of the ground contact point D1, and long members arranged in a grid pattern are positioned upwards. A first pivot axis E1 is positioned on one end of the frame D in the left-right direction, facing either in the slope direction or perpendicular to the surface of the cargo bed G.

[0024] Let me explain the mast frame E. The mast frame E is positioned higher than the tailgate 21 of vehicle B and the fixing part D3 of the underframe D. One side of the mast frame E is attached to the first pivot axis E1, allowing the extension / retraction mechanism F and the work section C to rotate horizontally. The mast frame E is mounted to the frame D so as to be able to rotate horizontally. Since the mast frame E is positioned higher than the tailgate 21 and the fixed part D3, it does not come into contact with the tailgate 21 or the fixed part D3 when rotating. In addition, it is possible to create a space between the bottom of the mast frame E and the ground contact part D1, which prevents the mast frame E from coming into close proximity to the work section C when the work section C described later is stored. The mast frame E can be driven to rotate around the first pivot axis E1 by the extension and retraction of the first cylinder 11 which is stretched between the support part D2 and the mast frame E. A second pivot axis E2, which is a horizontal axis, is provided on the other side of the mast frame E.

[0025] The extension / retraction mechanism F will now be described. The telescopic mechanism F is connected at one end to the second pivot axis E2 of the mast frame E and is mounted to be able to pivot up and down. The telescopic mechanism F is connected to the underframe D and can be deployed to extend and retract to the side of the vehicle B. The telescopic mechanism F has a first boom 16, a first connecting body 18, a second boom 17, a second connecting body 19, and a fifth pivot axis E5 which is the front-rear axis. The first boom 16 is mounted so as to be able to rotate up and down relative to the mast frame E by connecting one end to a second pivot axis E2 provided on the mast frame E. The second boom 17 is mounted so as to be able to rotate up and down relative to the first boom 16 by connecting one end to the other end of the first boom 16. Furthermore, the second boom 17 is mounted so as to be able to rotate in a direction intersecting the rotation direction of the first boom 16. One end of the second connecting body 19 is connected to the other end of the second boom 17. The telescopic mechanism F moves the work section C, which is connected to the second connecting body 19, in any direction. The telescopic mechanism F can be stored on the loading platform G. In the stored state, with the telescopic mechanism F and the work section C positioned on the loading platform G, the work section C is located above the frame D and below the telescopic mechanism F. Therefore, as shown in Figure 1, it is possible to lower the center of gravity.

[0026] Let me explain work area C. The work unit C is positioned on the other end of the second connecting body 19. In the deployed state shown in Figures 4 to 6, the work unit C can freely rotate up and down around the fifth pivot axis E5, which is a horizontal axis oriented in the front-rear direction and is positioned on the other end of the second connecting body 19. The work unit C can be driven to rotate up and down by the extension and retraction of the fifth cylinder 15 that spans the second connecting body 19 and the work unit C.

[0027] As shown in Figures 5 and 6, the working unit C in this embodiment of the invention has a rotor shaft C1, which is a horizontal axis that rotates in the left-right direction, arranged inside a cover body that is long in the left-right direction. Multiple cutting blades C2 are arranged at intervals in the direction of the rotor shaft C1 and in the direction of rotation of the rotor shaft C1. The cutting blades C2 cut and shred grass and other plants by the rotational drive of the rotor shaft C1. The working unit C is as described above, but there are no limitations on the direction of rotation, the arrangement and number of cutting blades C2, or the method of cutting grass and plants. For example, the cutting blades C2 may be in the form of a cord, or they may be cutting blades C2 that rotate around a vertical axis with respect to the work surface, or multiple such cutting blades arranged in the left-right direction, or the working unit C may have cutting blades C2 that reciprocate in the left-right direction.

[0028] Since the work unit C is movable up and down, even if the work surface is uneven, the work unit C can be appropriately positioned to follow the surface and cut accordingly. When working with the work unit C, for example, on the shoulder of a road such as a highway, the work unit C is extended to the slope Y6 outside the highway, as shown in Figures 19 to 21, and the grass on the slope Y6 is mowed. The work unit C can be positioned in an deployed state, where it is located to the side of the vehicle B in the direction of travel, by rotating the mast frame E and the telescopic mechanism F, and in a retracted state, where it is located on the cargo bed G, by rotating the mast frame E and the telescopic mechanism F.

[0029] In the telescopic mechanism F, the first boom 16 is a long member that can pivot vertically relative to the mast frame E and the base frame D by a second pivot axis E2, which is a horizontal axis provided on the mast frame E. The base end of the first boom 16 has a bent portion that is bent in a V-shape with the mountain side facing downwards. A second cylinder 12 is positioned above the first boom 16, extending from the upper part of the other end of the mast frame E to the middle part of the first boom 16. The extension and retraction of the second cylinder 12 allows the first boom 16 to be driven to pivot vertically.

[0030] In the telescopic mechanism F, 18 is the first connecting body. The first connecting body 18 is pivotably connected to the other end of the first boom 16. The first connecting body 18 is pivotably rotatable in the vertical direction parallel to the rotation direction of the first boom 16 by a third pivot axis E3, which is a horizontal axis parallel to the second pivot axis located at the tip of the first boom 16. The first connecting body 18 is driven to rotate vertically by the extension and retraction of the third cylinder 13, which connects the upper middle part of the first boom 16 to one end of the connecting body.

[0031] In the telescopic mechanism F, 17 is the second boom. The second boom 17 is connected to the other end of the attachment end of the first connecting body 18 to the first boom 16. The second boom 17 is able to rotate freely in the front-rear direction when deployed by being connected to the fourth pivot axis E4, which is a horizontal axis positioned perpendicular to the third pivot axis E3. The second boom 17 rotates in a direction perpendicular to the first boom 16 and the first connecting body 18 by the fourth pivot axis E4. The second boom 17 is driven to rotate in the front-rear direction around the fourth pivot axis E4 when deployed by the fourth cylinder 14, which spans the other end of the first connecting body 18 and the middle part of the second boom 17.

[0032] In the telescopic mechanism F, 19 is a second connecting body. The second connecting body 19 is positioned at the tip of the second boom 17. The second connecting body 19 forms a parallel link with the second boom 17 and the first connecting body 18 by a rod positioned inside the second boom 17. Therefore, the second connecting body 19 does not change direction even when the second boom 17 rotates around the fourth pivot axis E4.

[0033] M, as shown in Figures 2 to 6, is a power unit. In this embodiment of the invention, the power unit M is positioned on the other end of the frame D in the left-right direction. That is, it is located on the frame D on the side opposite to the direction in which the work section C unfolds. The power unit M comprises a prime mover M1 consisting of an internal combustion engine, a fuel tank M2, a fluid pressure source M3 that generates fluid pressure by receiving rotational power from the prime mover M1, and a directional control valve M4 that distributes the fluid pressure generated by the fluid pressure source M3 to the motor O that rotates each cylinder and rotor shaft C1. As a result, the implement A of the present invention can be operated by generating power independently without being towed by a tractor or without drawing power from the tractor. In this embodiment, the fluid pressure source M3 consists of a hydraulic pump. The frame D is equipped with a prime mover M1 and a fluid pressure source M3 capable of generating fluid pressure using the power of the prime mover M1. The fluid pressure generated by the power unit M is received by the first cylinder 11, second cylinder 12, third cylinder 13, fourth cylinder 14, and fifth cylinder 15, which operate the extension / retraction mechanism F. The generated fluid pressure also rotates the rotor shaft C1, thereby rotating the cutting blade C2. The positional relationships of the parts of work machine A are as follows. Note that the dimensions shown below are examples, and the present invention is not limited to these dimensional relationships. L4 Distance between the first pivot axis E1 and the end of the first connecting body 18 in the stowed position: 2.5m L5 Work area C total width: 1.3m The slewing radius of the first boom 16 and the first connecting body 18 around the first pivot axis E1 is such that the end of the first connecting body 18 has a maximum radius L4 when the first boom 16 is laid almost horizontally in the stowed position. The total width L5 of the working section C in the working width direction is set so that it does not protrude further rearward than the maximum radius L4 in the stowed position. When the first boom 16 is slewing upward around the second pivot axis E2 from the stowed position, even if the working section C, which is located below the first boom 16, slewing together with the first boom 16, it will not protrude radially outward beyond the maximum radius L4. Therefore, when the first boom 16 is raised from the stowed position, there is no risk of the working section C coming into contact with other members on the loading platform G. Furthermore, due to the relationship between the maximum radius L4 and the overall width L5, the retracted work unit C can be stored on the frame D without enlarging the contact area D1. Therefore, the retracted work machine A can stably make contact with the cargo bed G, and the vehicle B loaded with the work machine A can travel stably.

[0034] Let me explain the blower H. The blower H is detachably mounted on the cargo bed G and generates and sends out airflow. The blower H is positioned at the rear of the loading surface of the cargo bed G. The blower H is positioned on the cargo bed opposite to the side in which the work section C is deployed, when viewed from the direction of travel. In this embodiment, the deployed work section C is on the left side of the vehicle B in the direction of travel, and the blower H is positioned on the right side of the vehicle B in the direction of travel. By arranging the components on the loading platform G, including the frame D, telescopic means F, and work section C, as well as the blower H which is a component related to ventilation, it becomes possible to shift the center of gravity of the entire work machine A placed on the loading platform G towards the center of the loading platform surface.

[0035] The blower H is equipped with a turbo-type impeller O1 inside a casing H13. The casing H13 is mounted on a base N that is detachable from and loadable onto a loading platform G. The blower H draws in air from an intake port (not shown) in the direction of the rotation axis by rotating the impeller O1, and compresses and increases the pressure of the air as the rotating impeller O1 moves. The high-pressure air is then discharged from a discharge port H1 located tangentially to the rotation direction of the impeller O1 in the casing H13. In this embodiment, the discharge port H1 is oriented upward.

[0036] The blower H includes a motor that is driven by using the fluid pressure generated by the fluid pressure source M3 in common with the extension / retraction mechanism F and the working section C. In this embodiment, the motor is a hydraulic motor O. An impeller O1 is attached to the hydraulic motor O. A hydraulic motor O is connected to the rotating shaft (not shown) opposite the intake port of the blower H. The hydraulic motor O receives power from a power unit M installed on the frame D. The hydraulic motor O operates using the fluid pressure generated by a hydraulic pump, which is a fluid pressure source M3, located in the power unit M. The hydraulic pump, which is the fluid pressure source M3 used by the blower H, uses a common prime mover M1 that drives the fluid pressure sources M3 of each cylinder and hydraulic motor O in the working section C and extension means F. In this embodiment, a gasoline engine, which is an internal combustion engine, is used as the prime mover M1. In this embodiment, the hydraulic pump used by the blower H is configured to continuously discharge fluid while the prime mover M1 is operating.

[0037] Let me explain the insertion part N1. The lower part of base N is provided with an insertion section N1 for inserting the forks of a forklift. The upper part of base N also has multiple eye bolts 23 on which the hooks of a crane device can be attached. These features allow for easy attachment and detachment, as the loading method for the cargo bed G can be freely selected.

[0038] J is a hose. One end of hose J is connected to the outlet H1 of the blower H, guiding the airflow outside the cargo bed G. J1 is a nozzle. Nozzle J1 is connected to the other end of hose J, fixing hose J to the loading platform G and discharging airflow towards the work surface. Air discharged from the outlet H1 of the blower H is guided to a distant location by a hose J. The base end of the hose J is connected to the outlet H1, while the other end is positioned at the rear of the cargo bed G and on the side where the telescopic mechanism F is deployed. A nozzle J1 is connected to the end of the hose J, and compressed air is discharged from the nozzle J1.

[0039] In this embodiment of the invention, the discharge port of the nozzle J1 is provided in a circular cross-section with a diameter approximately the same as the cross-section of the hose J. However, the nozzle J1 may have a circular cross-section with a gradually decreasing diameter towards the tip, or the cross-sectional shape may be changed from a circular shape to another shape, such as an ellipse, towards the tip. Alternatively, a combination of these may be used. The tip of the hose J is fixed in position relative to the cargo bed G by a fixing means J2. The fixing means J2 includes a hose fixing part J21 that grips the hose J and fixes its vertical orientation, a cargo bed fixing part 22 that fixes the fixing means J2 to the tailgate 21 of the cargo bed G, and an adjustment part K that connects the hose fixing part J21 and the cargo bed fixing part 22 and allows adjustment of the horizontal orientation and vertical position of the tip of the hose.

[0040] The cargo bed fixing part 22 is provided on the left side in the direction of travel of the upper part of the rear tailgate 21, as shown in Figure 1, and is fixed to the tailgate 21 by sandwiching it, as shown in Figures 8 and 9. An adjustment part K is provided on the rear side of the cargo bed fixing part 22. The adjustment part K is equipped with a rod K1 on a boss K2. The adjustment section K, using a boss K2 and a rod K1, allows for adjustment of the vertical position and forward / backward orientation of the nozzle J1 relative to the cargo bed G. The fixing means J2 and adjustment part K allow the nozzle J1 to be freely adjusted to an appropriate direction and position, enabling efficient and effective blowing away of foreign objects on the work surface and road surface. The adjustment part K, consisting of the hose fixing part J21 and the cargo bed fixing part 22, allows the hose J and nozzle J1 to be attached to and detached from the cargo bed G, and the position of the hose J and nozzle J1 can be adjusted when attached, and this fixing and release is possible. In the embodiment, as shown in Figures 2, 5, and 7, the cargo bed fixing part 22 is provided on the left side in the direction of travel of the rear tailgate 211, and the nozzle J1 is positioned directly below it. However, the fixing position of the cargo bed fixing part 22 relative to the tailgate 21 is not limited, and for example, it may be provided on the right side in the direction of travel of the rear tailgate 211, and the nozzle J1 may be positioned directly below it.

[0041] A hose fixing part J21 is provided at the lower end of the rod K1 of the adjustment part K. The hose fixing part J21 integrally fixes the end of the hose J to the adjustment part J21 by tightening the end of the hose J with a band J3. The adjustment part K, which consists of the cargo bed fixing part 22 and the hose fixing part J21, does not protrude to the side of the vehicle B. In addition, the adjustment part K is configured not to protrude significantly to the rear from the cargo bed G, so it does not get in the way when driving on the road during work or when not working. In other words, even if the vehicle B moves on the roadway between work, there is no need to remove it, making it highly convenient. Furthermore, when completely removing the blower H from the cargo bed G, it is only necessary to release the fixing by the fixing means J2, making it easy to attach and detach.

[0042] The rod K1 of the adjustment unit K is a rod-shaped member with a circular cross-section, and is movable vertically by being inserted into the boss K2 located behind the cargo bed fixing unit 22. Furthermore, the rod K1 is rotatable along the circumferential direction of the inner diameter of the boss K2. The adjustment unit K can fix or release the vertical movement and rotation of the rod K1 relative to the boss K2 by tightening or loosening the knob bolt K3 provided on the boss K2. In this embodiment of the invention, the knob bolt K3 is provided at two locations, upper and lower, at different angles to each other, as shown in Figures 7 to 9. This allows the adjustment part K to be more firmly fixed to the cargo bed fixing part 22.

[0043] K4 is a bolt. As shown in Figures 8 and 9, by inserting the bolt K4 into a horizontal hole provided at the lower end of the adjustment part K, the hose fixing part J21 is made rotatable up and down around the bolt K4 as an axis. Further tightening of the bolt K4 locks the rotation. In other words, the nozzle J1 at the end of the hose can move up and down, rotate around the rod K1, and tilt up and down around the bolt K4 at the bottom of the rod K1 as an axis, and this movement can be locked and unlocked. Therefore, the nozzle J1 can achieve the angles and positional relationships required for the work. The cargo bed fixing part 22 allows the nozzle J1 and hose J to be attached to and detached from the cargo bed G, and the adjustment part K allows the direction and position of the nozzle J1 to be freely adjusted, and the nozzle J1 to be fixed and released.

[0044] The positional relationship between the parts of the work machine A and the blower H is as follows. Note that the dimensions shown below are examples, and the present invention is not limited to these dimensional relationships. L3 Distance between the rotor shaft C1 and nozzle J1 of the working section C in the deployed state: 5.2m L6 Distance between the rotor shaft C1 of the working section C in the deployed state and the blower H: 3.9m L7 Distance between the first swing axis and blower H: 2.8m The slewing radius of the first boom 16 and the first connecting body 18 around the first slewing axis E1 is a maximum radius L4. The blower H is positioned rearward from the first slewing axis E1 at a distance L7 that is longer than the maximum radius L4. By positioning it in this way, when the second boom is folded close to the first boom and the telescopic mechanism F is operated between the stored state and the deployed state, the first boom 16, the first connecting body 18 and the working section C will not come into contact with the blower H. In other words, the blower H is positioned so as not to interfere with the operation of the telescopic mechanism F.

[0045] The blower H, located on the cargo bed G, is positioned on the opposite side from the direction in which the telescopic mechanism F extends toward the side of the vehicle B. The working section C (rotor shaft C1) in its extended state and the blower H are positioned on the cargo bed G with a front-to-rear distance L6 that reaches approximately the total length of the cargo bed L2. Therefore, the shift in the center of gravity of the entire load on the cargo bed G, relative to the center of the cargo bed, caused by the working machine A in its extended state, can be mitigated, as the center of the cargo bed is the reference point. In the deployed state of the work machine A, the work section C is located in front of the first pivot axis E1 and in front of the loading platform G, so the distance L3 between the rotor axis C1 of the work section C and the nozzle J1 can be made longer than the total length L2 of the loading platform.

[0046] When mowing is performed by the work unit C, debris consisting of mowed grass and shredded vegetation may be generated from the work unit C toward the surrounding area. The debris will eventually fall to the ground and stop moving, or it will move along the ground while gradually slowing down. The debris that falls to the ground will eventually be positioned to the side of the nozzle J1, which moves forward with the work unit C by the vehicle. In this embodiment, the debris is located to the left of the direction of travel of the nozzle J1. The debris located to the side of the direction of travel of the nozzle J1 will be blown away to the side, away from the road, by the airflow discharged from the nozzle J1. Since the nozzle J1 can have a distance L3, the debris, which has slowed down considerably from its initial velocity generated at the work unit C, can be reliably blown away to the side by the airflow from the nozzle J1. Since the nozzle J1 moves integrally with the work unit C by the vehicle B, cleaning work by the blower H can be performed simultaneously with the mowing work at the work unit C.

[0047] Based on Figure 18, which shows the hydraulic circuit diagram of the blower H, the hydraulic circuit according to an embodiment of this invention will be described. H2 is the first switching valve, and H3 is the first flow control valve. A first switching valve H2 for distributing and controlling the fluid supplied to the hydraulic motor O and a first flow control valve H3 for controlling the flow rate of the fluid supplied to the hydraulic motor O are located within a base N that is detachable from and can be loaded onto the cargo bed G. A blower operation unit H21, as shown in Figure 7, is also located there to switch the first switching valve H2. The first switching valve H2 can also be switched using an operation unit V. By placing the blower operation unit H21 in the operation unit V inside the cabin B1, the worker B2 located inside the cabin B1 can operate it, enabling remote operation of the first switching valve H2.

[0048] The first switching valve H2 includes a first switching block H8 that connects the first pipe H6 to the hydraulic motor O and the second pipe H7 to the hydraulic motor O, each forming a flow in only one direction relative to the hydraulic motor O, and a second switching block H9 that connects the first pipe H6 to the hydraulic motor O and the second pipe H7 to the hydraulic motor O, and further connects the first pipe H6 and the second pipe H7. The first switching valve H2 controls the fluid flow by switching the first switching block H8 and the second switching block H9, respectively.

[0049] This section describes a rapid coupling consisting of a first rapid coupling H4 and a second rapid coupling H5. Rapid couplings (first rapid coupling H4 and second rapid coupling H5) are placed in the piping that connects blower H and hydraulic motor O to supply fluid pressure to blower H. By connecting and disconnecting the rapid couplings, the piping can be cut midway. By cutting the piping midway, it becomes possible to remove only the blower H from the prime mover M1 side, allowing the blower H to be easily loaded onto the cargo bed G. The rapid coupling has built-in check valves H41, H42, H51, and H52, so that the oil fluid does not leak out even when the rapid coupling is disconnected. In addition, when the rapid coupling is connected, the check valves H41, H42, H51, and H52 on both sides are in an open state, so the rapid coupling does not obstruct the fluid flow. The rapid coupling consists of a first rapid coupling H4 placed in the middle of the first piping H6 connecting the hydraulic pump M3 and the hydraulic motor O, and a second rapid coupling H5 placed in the middle of the second piping H7 connecting the hydraulic motor O and the tank M2. H11 is the second flow control valve. The second flow control valve H11 is positioned to connect the first pipe H6 and the second pipe H7.

[0050] A hydraulic pump M3 is connected to the prime mover M1, and the hydraulic pump M3 generates hydraulic pressure, which is fluid pressure, by obtaining rotational power from the prime mover M1. In this embodiment, a fixed displacement type pump is used for the hydraulic pump M3. As shown in Figure 18, when the hydraulic motor O is rotationally driven, the fluid is sent to the hydraulic motor O via the first piping H6 for supplying fluid to the hydraulic motor O, and then via the first rapid coupling H4 and the first switching valve H2 which is switched to the first switching block H8. The first piping H6 consists of the first piping H61 on the hydraulic pump M3 side and the first piping H62 on the hydraulic motor O side, separated by the first rapid joint H4. The hydraulic pressure supplied to the hydraulic motor O causes the hydraulic motor O to rotate, and the blower H, which receives the rotation from the hydraulic motor O, also rotates. The fluid is returned from the hydraulic motor O to the tank M2 side via the second pipe H7. The fluid is returned to the tank M2 via the second pipe H7 through the first switching valve H2 and the second rapid coupling H5. The second piping H7 consists of the second piping H71 on the hydraulic pump M3 side and the second piping H72 on the hydraulic motor O side, separated by the second rapid joint H5.

[0051] In the first switching block H8, the first pipe H6 and the second pipe H7 each independently form a unidirectional flow to the hydraulic motor O. This transmits the fluid sent from the hydraulic pump M3 to the hydraulic motor O, and the fluid is returned from the hydraulic motor O to the tank M2, thereby driving the hydraulic motor O to rotate.

[0052] In the second switching block H9, the first pipe H6 and the second pipe H7 are connected internally. As a result, the fluid pressure supplied from the hydraulic pump M3 is not transmitted to the hydraulic motor O but is returned to the tank M2 via the second switching block H9. In other words, even if the hydraulic pump M3 pressurizes the fluid to the hydraulic motor O, the hydraulic motor O will be unable to rotate. Furthermore, the connected first pipe H6 and second pipe H7 form a loop circuit on the hydraulic motor O side. As a result, the hydraulic motor O can rotate freely, and the blower H can also rotate freely.

[0053] The placement of the second switching block H9 allows the blower H to continue rotating by inertia even if the fluid pressure supply from the hydraulic pump M3 is suddenly stopped due to the first switching valve H2 switching from the first switching block H8 to the second switching block H9. Therefore, damage that could occur due to the sudden stop of the blower H can be prevented.

[0054] The first flow control valve H3 will now be explained. On the tank M2 side of the first switching valve H2, and on the first switching valve H2 side of the rapid couplings (first rapid coupling H4, second rapid coupling H5), the first flow control valve H3 is located, which connects the first piping H62 and the second piping H72. The first flow control valve H3 can continuously or incrementally adjust the amount of fluid pumped from the hydraulic pump M3 that is returned to the tank M2. Therefore, the hydraulic motor O can adjust the rotation speed of the blower H by adjusting the incoming fluid via the first flow control valve H3.

[0055] In this embodiment of the invention, when the first flow control valve H3 is fully closed, the amount of fluid supplied from the hydraulic pump M3 to the hydraulic motor O is maximized, and the rotation speed of the blower H is maximized. Conversely, when the first flow control valve H3 is fully open, the amount of fluid supplied from the hydraulic pump M3 to the hydraulic motor O is reduced to zero, and the rotation speed of the blower H stops. Note that the rotation control of the hydraulic motor O by adjusting the first flow control valve H3 is shown for the circuit configuration when the first switching valve H2 switches to the first switching block H8. The rotation speed of the blower H can be freely changed by adjusting the first flow control valve H3 between fully open and fully closed.

[0056] The first flow control valve H3 further includes a check valve H10. The check valve H10 is connected in parallel with the first flow control valve H3 and is positioned to allow fluid to flow unrestricted when the pressure is above a set level in the direction from the second pipe H72 toward the first pipe H62, while preventing fluid movement in the direction from the first pipe H62 toward the second pipe H72. Due to the arrangement of the check valve H10, if the rapid couplings on the hydraulic pump M3 side (first rapid coupling H4, second rapid coupling H5) and the rapid couplings on the blower H side (first rapid coupling H4, second rapid coupling H5) are misconnected, the fluid pressure pumped from the hydraulic pump M3 will be returned to the tank M2 via the check valve H10 without passing through the first switching valve H2 and the hydraulic motor O. Specifically, one possible scenario is when the hydraulic pump M3 side of the first rapid coupling H4 is connected to the hydraulic motor O side of the second rapid coupling H5, and the tank M2 side of the second rapid coupling H5 is connected to the hydraulic motor O side of the first rapid coupling H4. The placement of the check valve H10 protects the first switching valve H2 and the hydraulic motor O from abnormal pressure such as pressure rise, even if a misconnection of the rapid couplings (first rapid coupling H4, second rapid coupling H5) occurs, thus preventing damage.

[0057] This explains the H12 relief valve. The circuit from the rapid couplings (first rapid coupling H4, second rapid coupling H5) to the hydraulic pump M3 and tank M2 will be described. A relief valve H12 is placed in the first piping H61 on the hydraulic pump M3 side, which is connected to the second piping H7 on the tank M2 side. When the pressure in the first piping H6 rises to a set level, the relief valve H12 opens, and the fluid in the first piping H6 is returned to the tank M2 via the second piping H7. The relief valve H12 prevents the pressure in the first piping H6 from rising above the set level, even if abnormal pressure occurs, such as a pressure increase. In this embodiment, there is a hydraulic pump M3 that can continuously pump at full pressure, and rapid couplings (first rapid coupling H4, second rapid coupling H5) that can disconnect the pipelines of the first piping H6 and the second piping H7 midway. Even if pressure is applied from the hydraulic pump M3 while the first pipe H6 and second pipe H7 are disconnected midway by rapid couplings (first rapid coupling H4, second rapid coupling H5), the fluid is returned to the tank M2, thus protecting the first pipe H61.

[0058] I will now explain the second flow control valve H11. A second flow control valve H11 is connected to the first piping H61 on the hydraulic pump M3 side from the rapid couplings (first rapid coupling H4, second rapid coupling H5). One end of the second flow control valve H11 is connected to the first piping H6, and the other end of the second flow control valve H11 is connected to the second piping H71 on the tank M2 side from the rapid couplings (first rapid coupling H4, second rapid coupling H5). Similar to the first flow control valve H3, the second flow control valve H11 can continuously or gradually adjust the amount of fluid pumped from the hydraulic pump M3 returned to the tank M2. The second flow control valve H11, like the first flow control valve H3, also has a check valve H13. The check valve H13 is positioned in parallel with the second flow control valve H11 and is configured to allow unlimited flow in the direction from the second pipe H7 to the first pipe H6.

[0059] Normally, when using the blower H, the valve of the second flow control valve H11 is fully closed so that the entire amount of fluid pumped from the hydraulic pump M3 flows into the switching valve and the hydraulic motor O. When the blower H is not used, the valve is fully opened to return the fluid pumped from the hydraulic pump M3 to the tank M2, thereby preventing the fluid from being pumped from the rapid couplings (first rapid coupling H4, second rapid coupling H5) to the hydraulic motor O. Furthermore, when the rapid couplings (first rapid coupling H4, second rapid coupling H5) are disconnected and the first pipe H6 and second pipe H7 are cut, the relief valve H12 can be prevented from continuously operating by fully opening the valve of the second flow control valve H11. Therefore, the operating noise of the relief valve H12, which may occur when the rapid couplings (first rapid coupling H4, second rapid coupling H5) are disconnected, can be suppressed. Also, unlike the relief valve H12, there is no setting for the operating pressure, so no load is placed on the first piping H6 when the hydraulic pump M3 and the rapid couplings (first rapid coupling H4, second rapid coupling H5) are disconnected.

[0060] The blower H, which has the circuit shown in Figure 18, can be operated together with the work machine A mounted on the cargo bed G, or the blower H can be removed from the cargo bed G and the work machine A can be operated alone. Even when only work machine A is in operation, the hydraulic pump M3 will operate as long as the prime mover M1, which is located near work machine A, is operating. However, because the above circuit configuration does not place a load on the hydraulic pump M3 or its piping, this operation is possible even when only work machine A is in operation, without placing a load on components such as the power unit M. Therefore, the configuration in which the equipment is mounted on the cargo bed G can be freely changed depending on the nature of the work, improving the operational efficiency of vehicle B.

[0061] The storage state of the retractable mechanism F shown in Figures 1 to 3 will be explained. In the retracted state, the first boom 16 and the second boom 17 are positioned approximately parallel to the surface of the loading platform G. The telescopic mechanism F consists of a long body, and in the retracted state, the telescopic mechanism F is positioned to fold over the loading platform G in the long direction. The longitudinal direction of the first boom 16 and the second boom 17, which constitute the extension / retraction mechanism F in the retracted state, is oriented in the longitudinal direction relative to the direction of travel of the vehicle B. It is also possible to tilt the second boom 17 slightly in the left-right direction, as shown in Figure 2, so that it intersects with the first boom 16 in a plan view. In the stored state, with the telescopic mechanism F and the work section C positioned on the loading platform G, the work section C is located above the frame D and below the telescopic mechanism F. Therefore, it is possible to lower the center of gravity of the work machine A in the stored state. In the stowed position, the first boom 16 and the second boom 17 are positioned lower than the pivot axis relative to the mast frame E.

[0062] As shown in Figures 1 to 3, the retractable mechanism F is stored by rotating the mast frame E around the first pivot axis E1 such that the second pivot axis E2 is positioned rearward relative to the first pivot axis E1. The first boom 16 has its longest side facing rearward, and the longest portion from the bent section to the third pivot axis E3 is positioned almost parallel to the loading platform G. At this time, the third pivot axis E3 is positioned below the second pivot axis E2. In this way, the second cylinder 12, the third cylinder 13, and the first boom 16 do not protrude above the mast frame E, so the mast frame E is at its highest point when the work machine A is stored. That is, the upper end of the mast frame E is the highest point of the work machine A as cargo loaded on the loading platform G. Therefore, the portion protruding above the loading platform G does not increase, so the overall dimensions of the vehicle B when the work machine A is loaded are fixed at a low level, making it easier to operate. In addition, the center of gravity of the work machine A in the stored state can be further lowered. Therefore, when vehicle B is loaded with the stored work equipment A and traveling, safety can be further enhanced, and the stability of vehicle B during travel can be improved, allowing driver B3 to drive vehicle B with confidence.

[0063] When the telescopic mechanism F is in the retracted state, as shown in Figures 1 to 3, the second boom 17 is folded below the first boom 16, the second boom 17 is rotated, and the working section C is positioned below the second boom 17. In other words, the work unit C is located on the frame D and positioned below the folded telescopic mechanism F. Therefore, it is possible to lower the center of gravity. Furthermore, in a side view, the extended portion of the first boom 16 beyond the bend is positioned almost parallel to the second boom 17, and the cover body or rotor shaft C1 is positioned parallel to the extended portion of the first boom 16 beyond the bend and to the second boom 17. In this way, the bend allows the first boom 16 and the second boom 17 to be folded close together, so the entire telescopic mechanism F can be positioned at a low position when stored. As a result, the center of gravity of the entire work machine A in the stored state can be kept low, improving the driving stability of the vehicle B when the work machine A is loaded.

[0064] In the retractable mechanism F's stowed state, as shown in Figures 1 to 3, the work unit C in the stowed state is positioned closer to the mast frame E, so that the center of gravity, including the frame D, can be positioned approximately in the center of the frame D in both plan and side views. Therefore, when loaded onto the loading platform G, the work machine A can be stably grounded on the loading platform G. In other words, uneven loading is less likely to occur on the loading platform G, and stable loading is possible because the ground contact part D1 makes even contact with the loading platform G.

[0065] The positions of the centers of gravity when the work unit A is retracted are as follows: Q1a Center of gravity of implement A unit Q2a Center of gravity of the entire load on the cargo bed G Q3 Center of gravity of counterweight U alone Each center of gravity is located at a low position, as shown in Figures 1 to 3.

[0066] In the retractable mechanism F, as shown in Figure 2, in a plan view, the retracted second boom 17 is tilted toward the other end of the frame D on the fifth pivot axis E5 side as it moves from the fourth pivot axis E4 side toward the fifth pivot axis E5 side. This allows the working section C to be positioned directly below the first boom 16. In other words, the working section C can be moved toward the center of the frame D in a plan view, so the center of gravity of the working machine A in a plan view can be positioned approximately in the center of the frame D.

[0067] When the telescopic mechanism F is retracted, as shown in Figures 1 and 3, the center of gravity of the entire work machine A when retracted can be positioned near the center of the frame D and at a low position on the frame D, allowing for stable loading on the cargo bed G. Furthermore, when removing the work machine A from the cargo bed G, it can be lifted and lowered stably without tilting, whether by supporting it from below with a lift device or by lifting the frame D with a crane device. In other words, the work machine A can be easily removed from and installed on the cargo bed G. During periods when work with the work machine A is not being performed, the work machine A can be removed from the cargo bed G, and vehicle B can be operated as a normal cargo vehicle. Therefore, vehicle B can be used as both a cargo vehicle and a grass-cutting work vehicle B, improving operational efficiency.

[0068] The method for storing the retractable mechanism F will be explained. To switch from the deployed state to the retracted state, operator B2 operates the control unit V to rotate the extension / retraction mechanism F and the work unit C. An example of operation is described below. Here, the explanation assumes a transition from the deployed state shown in Figures 4 to 5 to the stored state shown in Figures 1 to 3. (1) The second boom 17 is swung backward to move the work section C to the rear. (2) The work section C is then swung upward around the fifth slewing axis E5 until the rotor shaft C1 or the cover body is parallel to the second boom 17 when viewed from the rear. (3) The first connecting body 18 is swung around the third slewing axis E3, and the second boom 17 is swung so that it is approximately parallel to the first boom 16 when viewed from the rear. (4) The first boom 16 is swung around the second slewing axis E2, and the work section C is raised to a position above the tailgate 21 and the fixing part D3. (5) The mast frame E is rotated horizontally to position the work section C on the base frame D. (6) The first boom 16 is swung to lower the work section C, and the stored state is formed.

[0069] The deployed state of the retractable mechanism F will be described. The extended state of the telescopic mechanism F is when the mast frame E is rotated by the first cylinder 11, with its other end facing the side of the vehicle B. In other words, in the extended state, the telescopic mechanism F and the work section C are positioned to the side of the vehicle B. In the deployed state, as shown in Figure 5, the work unit C is located right next to worker B2, who is in vehicle B, making it possible to perform the work while checking the work status.

[0070] The mast frame E in the deployed state of the telescopic means F will be described below. As shown in Figures 4 to 6, in the extended state of the telescopic means F, the mast frame E is positioned at a distance above the ground contact portion D1 of the frame D, so that when rotating from the retracted state to the extended state, the mast frame E does not interfere with the tailgate 21 or the fixing portion D3. Furthermore, because interference can be avoided, the distance between the first pivot axis E1 and the second pivot axis E2 of the mast frame E can be increased, allowing the second pivot axis E2 to protrude from the loading platform G toward the side of the vehicle B. Also, since the second pivot axis E2 can be positioned at a high position on the frame D, the first boom 16, which is the telescopic means F connected to the second pivot axis E2, can be positioned at a high position. In other words, a wide space can be secured from above the work surface to below the first boom 16. This increases the chances of easily passing over obstacles (in this embodiment, guardrails, protective fences, signs, trees not to be mowed, etc.) that are present below the first boom 16.

[0071] The first boom 16 in the deployed state of the telescopic means F will be described below. As shown in Figure 6, in the extended state of the telescopic means F, the first boom 16 can be positioned upwards by the bending portion, so that the tip side where the longitudinal third pivot axis E3 is located can be positioned upwards, thereby making it possible to secure a wider space below the first boom 16. In addition, since the second cylinder 12 and the third cylinder 13 are positioned above the first boom 16, they facilitate the securing of space below the first boom 16.

[0072] The first connecting body 18 and the second boom 17 in the deployed state of the telescopic means F will be described below. As shown in Figure 6, in the extended state of the telescopic means F, the first connecting body 18 is rotated by a third pivot axis E3 parallel to the second pivot axis E2, allowing the lower end of the extended second boom 17 to swing left and right in the direction of travel. Furthermore, by providing a fourth pivot axis E4, the first connecting body 18 can swing the lower end of the second boom 17 back and forth. The fourth cylinder 14 that swings the second boom 17 is positioned on the rear side of the second boom 17, preventing it from directly colliding with obstacles approaching from the front as it moves forward.

[0073] The second connecting body 19 and the working section C in the deployed state of the telescopic means F will be described below. As shown in Figures 4 to 6, in the extended state of the telescopic mechanism F, the first connecting body 18, the second connecting body 19, the second boom 17, and the rod form a parallel link which is a four-bar link. Therefore, even when the second boom 17 of the working section C is rotated in the front-rear direction around the fourth pivot axis E4, there is no change in the front-rear tilt. When the telescopic mechanism F is extended, the work section C can be positioned to the side of the cabin B1 in front of the loading platform G by rotating the second boom 17 forward and backward. The worker B2 positioned inside the cabin B1 can easily visually confirm the work section C from inside the cabin B1. Although not shown in the diagram, the work vehicle can adjust the position of the telescopic mechanism F and the work section C by operating the control unit V located inside the cabin B1 to drive each cylinder. Since the work section C can be tilted left and right by the fifth cylinder 15, the work section C can be easily adjusted to be parallel to the work surface even in places where the work surface is sloped left and right. To deploy the retractable mechanism F, the procedure is the reverse of the procedure used to retract the retractable mechanism F into its stored state.

[0074] The position of the center of gravity when work unit A is deployed is as follows: Q1b Center of gravity of implement A unit Q2b Center of gravity of the entire load on the cargo bed G Q3 Center of gravity of counterweight U alone Q3a Center of gravity of counterweight U alone (when located inside the cargo bed) Q3b Center of gravity of counterweight U alone (when located outside the cargo bed) Each center of gravity is located at a low position, as shown in Figures 4 to 7.

[0075] This section describes the configuration overview of counterweight U. The counterweight U comprises a frame U1 formed in the shape of a rectangular parallelepiped by combining long materials in a grid pattern, a rail U4 spanning inside the frame U1, a movable platform U3 that moves along the rail U4, a weight U2 loaded on the movable platform U3, and a case U7 connected to the movable platform U3 and located below the rail U4. The case U7 contains a movable platform U3 and an actuator T, which is a drive device for moving the case U7 on the rail U4. The operation of the actuator T causes the weight U2 to move on the rail U4, thereby shifting the center of gravity of the balance weight itself. The counterweight U is loaded onto the rear side of the cargo bed G, on the side opposite to the direction in which the deployed work section C is deployed.

[0076] The counterweight U is a means to maintain the balance of vehicle B even if the work unit C moves laterally relative to the direction of travel of the loading platform G due to the shift in the center of gravity of the counterweight U itself. When the telescopic means F is extended so that the work unit C is positioned on the left side in the direction of travel, the sensor detects the tilt of the loading platform G and moves the counterweight U to the right on rail U4. This prevents the work unit C from lowering and hitting the ground. By correcting the tilt of the loading platform G and maintaining the loading platform G at a constant angle, the ability of the work machine A to follow the ground is improved. In other words, by keeping the angle of the loading platform G constant, the deployed work unit C is prevented from moving up and down due to the tilt of the loading platform G, thus reducing the need for operator B2 to adjust the vertical position of the work unit C by operating the control unit V. Although we will describe Vehicle B (the truck) as traveling at 5 km / h while performing grass cutting work, there are no restrictions on the speed, and the speed will be adjusted as needed during grass cutting.

[0077] U1 is the frame. Frame U1 is a structural component of the counterweight U, formed by combining long members in a grid pattern to create a horizontally elongated rectangular parallelepiped shape. Square pipes or square bars are used for the long members. An annular member U14 is fixed to the top of frame U1, allowing it to be lifted by a lifting device such as a crane. Therefore, frame U1 can be easily loaded onto the cargo bed G of a freight vehicle B, such as a truck.

[0078] U4 is a rail. Rail U4 is installed inside frame U1. Rail U4 is installed slightly below the middle of frame U1 in the height direction. The longitudinal direction of rail U4 is the horizontal direction of the rectangular parallelepiped of frame U1 and is installed facing the long side of frame U1. In this embodiment, rail U4 is installed so as to face left and right with respect to the direction of travel of vehicle B. Rail U4 allows the weight U2, described later, to be moved in the longitudinal direction of rail U4 and can support the load of weight U2. In this embodiment, three rails U4 are installed, but there is no limit to the number of rails to be installed as long as the weight U2 can be moved and the load of weight U2 can be supported.

[0079] U5 is a support member. Support member U5 is located below the movable base U, which is located at the top. As shown in Figure 12, support members U5 are provided opposite each other so as to sandwich the rail U4, and extend along the longitudinal direction of the rail U4. Multiple rotating shafts U61 are provided between each of these opposing support members U5. Rollers U6 are provided on the rotating shafts U61, and the movable base U3 is made movable in the longitudinal direction of the rail U4. The lower end of the support member U5 extends below the lower end of the rail U4. Therefore, when the roller U6 rolls on the rail U4, the support member U5 contacts the side of the rail U4, preventing it from moving in the lateral direction, which is the direction that intersects the longitudinal direction of the rail U4. Consequently, the movable base U3 is only able to move in the longitudinal direction of the rail U4.

[0080] A sliding member U8 can be provided at the contact surface between the rail U4 and the support member U5. In this case, since the rail U4 and the support member U5 do not come into direct contact, the movable base U3 can move smoothly along the rail U4. The sliding member U8 is a low-friction member, and it is preferable to use a resin-based material; in this embodiment, a polyethylene-based resin is used. The sliding member U8 only needs to be able to contact one side of at least one rail U4 and the other side of at least one rail U4. In this embodiment of the invention, of the three rails U4, one rail U4 is positioned on the outside so as to be able to contact the side of the frame U1 facing outward in the longitudinal direction, and the other rail U4 is positioned so as to be able to contact the side of the frame U1 facing outward in the longitudinal direction. By positioning the sliding member U8 close to the outside of the frame U1, the hands and tools of worker B2 can be easily reached from the outside of the frame U1, making it easier to inspect, replace, and perform other maintenance on the sliding member U8.

[0081] U3 is a movable platform. The movable platform U3 is mounted on the rail U4, as shown in Figure 11. The movable platform U3 is movable along the rail U4. Multiple rollers U6 are provided on the lower part of the movable platform U3. The movable platform U3 has a weight loading surface U9 on top for loading weights U2. The movable platform U3 and weight loading surface U9 are arranged in a rectangular shape in plan view, with their shorter sides oriented in the longitudinal direction of the rail U4. In other words, the direction of the longer side U11 of the rectangular parallelepiped frame U1 in plan view is parallel to the direction of the shorter side of the movable platform U3 and weight loading surface U9. Furthermore, the length of the longer side of the movable platform U3 and weight loading surface U9 in plan view is approximately the same as, or less than, the length of the shorter side U12 of the frame U1 in plan view.

[0082] Multiple rollers U6 are provided on the support member U5 so that multiple rollers can roll on each rail U4. In this embodiment, four rollers U6 are provided so that they roll on each rail U4, and the entire movable platform U3 is supported by a total of 12 rollers U6. By distributing the multiple rollers U6, it is possible to distribute the load applied from the movable platform U3 to the rail U4, thereby enabling smooth movement of the movable platform U3. The roller U6 rolls along the rail U4, allowing the movable base U3 to move freely in the longitudinal direction of the rail U4. The roller U6 is positioned between support members U5 located at the bottom of the movable base U3 and is rotatably supported by a rotating shaft U61 located on the support members U5.

[0083] In a plan view, the weight U2 has substantially the same projected area and shape as the movable base U3, and is composed of multiple weights that can be stacked vertically. It is loaded onto the weight loading surface U9 of the movable base U3. The movable platform U3, on which weight U2 is loaded, can be moved along the longitudinal direction of rail U4, thereby changing the center of gravity of the entire counterweight U. The weight U2 in this embodiment is formed from plate-shaped steel plates, which are then stacked to form the weight U2. This configuration allows for precise adjustment of the weight U2's weight, thus enabling adjustment of the load change that shifts the center of gravity. Furthermore, when combined with the work machine A (described later), the overall weight of the counterweight U can be adjusted according to changes in the specifications of the work machine A, such as its form and weight.

[0084] The weight U2 is provided in a rectangular shape in plan view, with its shorter side oriented in the longitudinal direction of the rail U4. In other words, the direction of the longer side U11 of the rectangular frame U1 in plan view is parallel to the direction of the shorter side of the weight U2. In plan view, the length of the longer side of the weight U2 is approximately the same as or less than the length of the shorter side U12 of the frame U1 in plan view. As shown in Figures 11 and 12, a bolt U10 is provided extending upward from the weight loading surface U9, and this bolt U10 is passed through the weight U2. When tightened from above with a nut U13, the weight U2 is fixed integrally with the movable base U3. Therefore, even if the movable base U3 moves, there is no risk of the weight U2 falling from the weight loading surface U9, and the movable base U3 and the weight U2 can move together on the rail U4.

[0085] Case U7 is located below rail U4 and moves along rail U4 in conjunction with the movable base U3. Case U7 is provided in a rectangular shape with a short side and a long side in a plan view, and moves along the lower side of rail U4 so as to move in the direction of the short side of case U7 when driven by actuator T. The movement speed of case U7 is set to be faster than the driving speed of actuator T. A case U7 is fixed to the lower end of a support member U5 provided on the movable base U3, so as to suspend it. The case U7 is a rectangular box-shaped member, and its plan view shape is made to be almost identical to that of the weight U2. That is, in plan view, the short side of the case U7 is parallel to the long side U11 of the frame U1. In a plan view, case U7 moves along rail U4 so as to be movable in the direction of the shorter side of case U7, and moves inside frame U1 in the direction of the longer side U11 of frame U1. Case U7 is positioned to have the maximum possible movement distance inside frame U1.

[0086] Case U7 is equipped with an actuator T, which is a drive source for moving a movable base U3, one end of which is connected to case U7. Actuator T is a cylinder positioned to extend and retract along the long side of case U7. Driven by actuator T, case U7 moves along the lower side of rail U4 in the direction of the shorter side of case U7. As case U7 moves, the movable base U3 and weight U2 also move together. The drive mechanism described later is configured so that the movement speed of case U7 is faster than the drive speed of actuator T. The actuator T is equipped with an operating unit V3 located above the rear of the frame U1, which has a changeover switch V1 that can switch between a posture-linked mode and a standalone operation mode. The standalone operation mode is a mode in which the actuator T can be driven to move the weight U2 to any position by operating the operating unit V3. The posture-linked mode is a mode in which the actuator T is automatically driven to move the weight U2 when the rail U4 is tilted, regardless of the operation of the operating unit V3. The operating unit V3 is equipped with a control unit (not shown) that drives the actuator T so that the movable base U3 and case U7 move upward in the direction of the tilt of the rail U4 when the left and right ends of the rail U4 in the direction of travel are tilted.

[0087] The mechanism for moving the weight by driving the actuator T will be explained with reference to Figures 11 to 13. The actuator T installed inside case U7 is an electric cylinder, which is a cylinder with a rod that extends and retracts when power is received. One end of actuator T is fixed inside the case. The extension and retraction direction of actuator T is set parallel to the long side direction of case U7, so that even if the overall length of actuator T changes due to extension and retraction, it does not protrude from inside case U7. Furthermore, the extension and retraction direction of actuator T is set parallel to the short side U12 direction of frame U1. In other words, the extension and retraction direction of actuator T is set to intersect with the direction of movement of weight U2.

[0088] T1 is the first chain T1. As shown in Figures 11 to 13, the rod end of the first chain T1 is connected to the other end of the actuator T, and is arranged to be able to rotate around the actuator T. T2 is the second chain. As shown in Figures 11 to 13, the second chain T2 moves the case U7 along the rail U4 by the rotation of the sprocket. The sprocket consists of a first sprocket T3, a second sprocket T4, and a third sprocket T5. The sprocket is made rotatable by the circumferential drive of the first chain T1.

[0089] The sprockets are positioned inside case U7 at intervals parallel to the extension and retraction direction of actuator T. The sprockets increase the speed of the cylinder's movement. An endless first chain T1 is wrapped around one sprocket, the first sprocket T3, and the other sprocket, the second sprocket T4. In this embodiment of the invention, the first sprocket T3 and the second sprocket T4 have the same number of teeth. A connecting member T7 is provided on some of the chain links of the first chain T1, which is located between the first sprocket T3 and the second sprocket T4. This connecting member T7 connects to the end of the extendable rod portion of the actuator T. The extension and retraction of the actuator T causes the first chain T1 to rotate via the connecting member T7. The connecting member T7 is located on the extension line of the rod of the actuator T, and by connecting to the other end of the rod, it converts the extension and retraction motion of the actuator T into a rotational motion of the first chain T1. The length of the straight section of the first chain T1, which moves in a circular motion, is set to be greater than the stroke amount of the actuator T's extension and retraction motion. The other end of the actuator T extends and retracts within the range of the straight section of the first chain T1. This allows the connecting member T7 to convert the entire stroke amount of the actuator T into the circular motion of the first chain T1.

[0090] A third sprocket T5 is mounted coaxially with the first sprocket T3. In this embodiment of the invention, the first sprocket T3 and the third sprocket T5 are integrally mounted. Furthermore, the third sprocket T5 has more teeth than the first sprocket T3. The third sprocket T5 can be rotated by an actuator T via the first chain T1 and the first sprocket T3.

[0091] A second chain T2 with ends is provided at the bottom of the rail U4. One end of the second chain T2 is connected to one short side U12 of the frame U1, and the other end is connected to the other short side U12 of the frame U1. The middle section of the second chain T2 is then wrapped around the third sprocket T5. The teeth of the third sprocket T5 engage with the links of the second chain T2, causing it to rotate and allowing the case U7 to move from one end of the second chain T2 to the other, or from the other end to the first end. Since the case U7 is guided in the direction of movement by the rail U4, it can move back and forth along the rail U4 by extending and retracting the actuator T. In addition, the movable platform U3 connected to the case U7 and the weight U2 on the movable platform U3 also move along the rail U4 together with the case U7 by extending and retracting the actuator T.

[0092] A guide sprocket T6 is provided near the third sprocket T5 around which the second chain T2 is wrapped. As shown in Figure 13, the guide sprockets T6 are provided in two locations on the long side of the case, and by wrapping around them, the second chain T2, which is located outside the case U7, appears to be in a straight line. In this embodiment, the second chain T2 is located in a straight line from left to right with respect to the direction of travel. Therefore, even if the rotation of the third sprocket T5 causes it to bite into the second chain T2 and the case U7 moves along the longitudinal direction of the rail U4, the second chain T2, which is connected and fixed to the short sides U12 on both the left and right sides in the direction of travel of the frame U1, is constantly subjected to a force in a horizontal direction perpendicular to the direction of the short sides U12 of the frame U1. The connection between the short sides U12 of the frame U1 and the second chain T2 only needs to respond to a force applied in one direction, and the configuration of that part can be simplified. In addition, the case U7 on which the guide sprocket T6 is located does not have a load applied by the second chain T2 in a direction perpendicular to the longitudinal direction of the rail U4, so it can move smoothly along the rail U4.

[0093] The effects of moving weight U2 and case U7 will be explained. The actuator T, first sprocket T3, second chain T2, and third sprocket T5, which are components placed inside case U7, can move together with case U7, which moves along rail U4. In other words, they function as weight components that move together with case U7 and the components placed inside case U7, which are located below weight U2.

[0094] All components other than frame U1 and rail U4 can function as moving weight components. Therefore, actuator T moves together with case U7 and the components placed inside case U7, while actuator T expands and contracts. Although the actuator T is positioned to extend and retract parallel to the long side of case U7, case U7 itself moves in the direction of its short side. Furthermore, the short side of case U7 moves in a direction parallel to the long side U11 of frame U1, which is the direction along the longitudinal direction of rail U4. As a result, case U7 and weight U2 can be moved significantly within frame U1 in a direction different from the extension and retraction direction of actuator T.

[0095] The third sprocket T5 has a larger number of teeth than the first sprocket T3. In other words, the gear ratio is set so that the stroke amount output from the third sprocket T5 to the second chain T2 is greater than the stroke amount received by the actuator T of the first chain T1. As a result, the case U7 can move along the rail U4 far greater than the stroke amount of the actuator T, and the weight U2 connected to the case U7 can also move along the rail U4 faster than the extension and retraction speed of the actuator T. In this embodiment, the gear ratio is set so that the movement speed of the weight U2 is about four times the extension and retraction speed of the actuator T, but the gear ratio can be freely changed by changing the number of teeth on the third sprocket T5 and the first sprocket T3.

[0096] By using a chain and sprocket to handle the movement of case U7, these components are efficiently arranged within case U7, and since they do not protrude outside case U7 in the direction of case U7's movement, they do not obstruct the movement stroke of case U7 while it remains housed inside frame U1.

[0097] The upper part of the frame U1 is provided with a sensor unit Pa, which is a tilt sensor as shown in Figures 14 to 16, and an operating unit V3 as shown in Figure 17. The actuator T includes a sensor unit Pa, which is a tilt sensor capable of detecting the inclination of the rail U4 relative to its longitudinal direction. The sensor unit Pa is attached to the long side U11 of the frame U1 using a mounting base P4. The sensor unit Pa is also the first sensor unit, and as shown in Figures 14 to 16, it is equipped with a pendulum P2 with a pivot axis P1 at its upper part, which is a pivot point, and a detection member P3 that detects the tilt and swing of the pendulum P2. The detection members P3 are provided at two locations on both sides of the pendulum P2, and a detection signal is emitted when the pendulum P2 comes into contact with the detection members P3. The pivot point of the pendulum P2 has an axis directed in the direction of the short side U12 of the frame U1, and it swings as the end of the frame U1 relative to the direction of the long side U11 tilts up and down. When the amount of swing becomes large, one of the two detection members P3 provided with the pendulum P2 becomes non-contact, and a detection signal cannot be emitted.

[0098] In this embodiment of the invention, if the end of the frame U1 with respect to the long side U11 direction is not tilted up or down, the pendulum P2 will come into contact with the two detection members P3, and the control unit, described later, will recognize the detection state of the two detection members P3 and process it as either a horizontal state or a set tilt state with a preset tilt angle. If the end of frame U1 with respect to the long side U11 is tilted vertically, the pendulum P2 will be in contact with only one of the detection members P3, and the control unit recognizes this as a tilted state. In other words, it recognizes that the longitudinal direction of frame U1 on the side of the detection member P3 that the pendulum P2 is in contact with is tilted downwards. The angle at which the detection member P3 detects the tilted state can be freely changed by changing the shape of the pendulum P2 and the positional relationship of the detection member P3 with respect to the pendulum P2.

[0099] The control unit V3 has a control unit (not shown) that receives a detection signal and commands the actuator T to perform an action in accordance with this detection signal. As shown in Figure 17, the control unit V3 has a changeover switch V1 for switching between an automatic mode, in which the actuator T operates automatically in accordance with the detection signal, and a manual mode, in which the actuator T is operated by the operator B2. The control unit V3 also has an operation switch V2 for switching the extension and retraction direction of the actuator T in manual mode. In this embodiment, the control unit V3 is directly attached to the frame U1, but it can also be installed in a control unit V located inside the cabin B1 so that it can be operated remotely by the operator B2 inside the cabin B1. In this way, the operator B2 can operate the control unit without having to get out of the cabin B1, even while working.

[0100] Let's explain the automatic mode. When the system switches to automatic mode using the changeover switch V1, the control unit recognizes the tilt of frame U1 by receiving a detection signal, and based on the received detection signal, extends or retracts actuator T. In other words, the case U7 is automatically moved by the tilt of frame U1. When the frame U1 tilts and the detection member P3 comes into contact with it, that is, when the tilted lower detection member P3 comes into contact with the pendulum P2, the control unit extends or retracts the actuator T to move. In this way, the tilt of the loading platform G, which changes due to the change in the center of gravity according to the operating posture of the work machine A, is suppressed. Since the loading platform G can maintain a horizontal state or a set tilt state, the vertical movement of the work unit C, which is located to the side of the vehicle B by the extension / retraction means F, can be suppressed as it changes due to the tilt of the loading platform G. Since the vertical movement of the work unit C can be suppressed, the height of the work unit C relative to the ground becomes constant, and the cutting height can be stabilized. In this embodiment of the invention, when one side of the frame U1 tilts downward, the lower end of the pendulum P2 also tilts, causing the detection member P3 located on one side of the frame U1 to contact the pendulum P2 and emit a detection signal. Upon receiving the detection signal, the control unit extends or retracts the actuator T so that the case U7 and weight U2 move in the direction upward of the tilted frame U1. When the tilt of the frame U1 is relieved, the contact between the detection member P3 and the pendulum P2 is released, and the emission of the detection signal is also stopped. The operation of the actuator T is also stopped. The same applies when the other side of the frame U1 tilts downward.

[0101] The second sensor unit Pb in automatic mode will be described below. In addition to the first sensor unit Pa shown in Figures 14 to 16, a second sensor unit Pb can also be installed. The second sensor unit Pb has the same structure as the first sensor unit Pa. In this embodiment of the invention, the second sensor unit Pb is provided at both ends of the movable base U3 in the longitudinal direction of the rail U4. When the movable base U3, which is moving along the rail U4, reaches the end of the rail U4, the sensor is activated by contact with the frame U1, and the control unit recognizes that the end of the rail U4 has been reached. In this case, even if the control unit recognizes the inclination through the operation of the first sensor unit Pa, if it reaches the upper end of the inclined rail U4, it will stop the operation of the actuator T that would attempt to move the rail U4 further upwards if it is inclined any more. This configuration avoids unnecessary operation of the actuator T.

[0102] Let's explain manual mode. When switched to manual mode, operator B2 can extend or retract actuator T in any direction by operating the operation switch. In other words, weight U2 can be freely positioned in any direction.

[0103] A modified example of the sensor unit Pa will be described. The detection member P3 is configured to emit a detection signal upon contact with the pendulum P2, but it may also be configured to constantly detect the tilt angle of the pendulum P2. In this case, the control unit may receive a tilt signal, which is a signal of the tilt angle of the pendulum P2, and control the actuator T to operate by a stroke amount corresponding to the tilt signal.

[0104] This section describes the installation of counterweight U onto vehicle B. Vehicle B has a work machine A positioned on the front side of the loading platform G that can be extended to the side in the direction of travel of vehicle B, and a weight device is installed on the rear side of the loading platform G so that a weight U2 can move along a rail U4 oriented in the left-right direction of travel. More preferably, the counterweight U is located at the rearmost end of the loading platform G, and the extended portion of the work machine A is located on the opposite side.

[0105] This section explains the center of gravity when work implement A is stored. When the work implement A is retracted, the work unit C is placed on the loading platform G, and vehicle B becomes capable of driving on the road as usual. At this time, it is ideal that the center of gravity Q1a of the heavy objects loaded on the loading platform G is located in the center of the loading platform G in a plan view. The center of gravity of the work implement A alone when retracted is located in front of the loading platform G. However, by loading the counterweight U at the rear of the loading platform G, the center of gravity Q2a of the work implement A and the counterweight U combined can be positioned in the center of the loading platform G. In this way, when the work implement A is retracted, the center of gravity Q2a of the entire load on the loading platform G, together with the counterweight U, can be shifted towards the center in a plan view. Furthermore, when the work implement A is in the stowed position, the counterweight U can move weight U2 towards the center of the loading platform G of vehicle B in the left-right direction, either in automatic or manual mode. This allows the center of gravity Q3 of the counterweight U2 itself to be moved from the center of gravity Q3b located at the end of the loading platform G to the center of gravity Q3a on the loading platform G side, thereby mitigating the left-right bias of the center of gravity on the loading platform G and achieving a center of gravity Q2a.

[0106] This section explains the center of gravity when work implement A is deployed. When work implement A is deployed to the side, vehicle B tilts due to the compression of its suspension, shock absorbers, and tires, causing the side of work implement A that is deployed to sink downwards. The center of gravity Q1a of work implement A in the deployed state is located to the side of the loading platform G, so the loading platform G tilts so that the side of work implement A that is deployed to sink downwards. At this time, the counterweight U in automatic mode tilts so that one end of the rail U4 in the longitudinal direction sinks downwards. The detection member P3 then detects the tilt and sends a detection signal to the control unit. The control unit operates the actuator T so that the weight U2 moves upwards toward the tilted loading platform G. The weight U2 then moves upwards toward the direction of the tilt to return the tilt of the loading platform G to a horizontal state or to mitigate the tilt. As weight U2 moves, the center of gravity Q3 of the counterweight U itself shifts from the center of gravity Q3a located on the central side of the loading platform G to the center of gravity Q3b on the side opposite to the deployment direction of the work implement A on the loading platform G. In this way, the loading platform G of vehicle B can be returned to a horizontal state or the tilt can be reduced. In this way, even when the work implement A is deployed, the movement of the center of gravity Q3 of the counterweight U brings the loading platform G to a horizontal or near-horizontal state, or to a set tilt state, thereby correcting the left-right balance when deployed. This makes it possible to perform work with the work implement A properly.

[0107] In the deployed state of work unit C, as shown in Figure 4, work unit C is located right next to worker B2 who is in vehicle B, making it possible to perform work while checking the work status. Figure 19 is a rear view showing the operation of a work machine according to an embodiment of this invention. The operation is horizontal. Y represents the road side of a highway (an example of a road), Y1 is the shoulder, Y2 is outside the road, Y3 is a support post, and Y4 is a guardrail. Y5 is a set of signs. The set of signs Y5 consists of a display board Y51 and a reflector Y52. The set of signs Y5 is attached to the support post Y3. When work is being performed at the shoulder Y1 of the highway by work unit C, the telescopic means F extends horizontally, and the first boom 16 straddles the support column Y3, guardrail Y4, sign Y51, and reflector Y52 from above, and work unit C performs grass cutting work on the ground outside the road Y2. Figure 20 is a rear view showing the operation of work machine A according to an embodiment of this invention. The operation is an upward inclined operation.

[0108] Figure 21 is a rear view showing the operation of work machine A according to an embodiment of this invention. The operation is a downward inclined operation. Implement A can perform grass cutting work with the work unit C of vehicle B, while positioning the work unit C outside the road Y2, and adapting to the slope of the ground outside the road Y2. By operating the telescopic means F with the operation unit V, implement A can adjust the work unit C, shown by the solid line in Figures 19 to 21, from a position close to the protective fence Y4 to a position farther away from the protective fence Y4, and perform work accordingly. Therefore, even in places where vehicles cannot enter, the work unit C can be positioned in a remote location using the telescopic means F and work can be performed. Furthermore, as shown in Figures 20 and 21, the work unit C can be rotated up and down around the fifth pivot axis E5, and the telescopic means F can be rotated up, down, left and right to adapt to the slope Y6. By adjusting the center of gravity with the counterweight U, the work unit C located in a remote location does not move unnecessarily up and down, thus enabling proper grass cutting work.

[0109] Conventionally, the implement A was towed or attached to a dedicated work vehicle such as an agricultural tractor. However, in this embodiment of the invention, both the work unit C and the blower unit H are mounted on a general-purpose vehicle, vehicle B. A dedicated work vehicle such as a tractor is not required, and there is no need to receive rotational power from the work vehicle, so the work unit C and the blower unit H can operate independently regardless of power transmission to vehicle B. In this embodiment of the invention, when installed on vehicle B, a blower H is provided at intervals at the rear of the work machine A. In particular, the nozzle J1 of the blower H is provided at intervals at the rear of the work machine A. Alternatively, the blower H is provided at intervals at the rear of the work machine A, and the nozzle J1 provided on the feeder H is installed at the rearmost part of the vehicle. Therefore, it is possible to blow away foreign matter such as grass and debris cut by the work unit C. Since the nozzle J1 is installed at the rear of the vehicle, it is possible to blow away foreign matter in a state where the scattering speed has decreased. By adjusting the position of the nozzle J1 relative to the cargo bed G by the adjustment unit K, as well as the angle of the nozzle J1 in the front-rear and back-up directions, foreign matter can be blown away to the roadside Y2 without scattering towards the road Y side. Therefore, no foreign matter is scattered behind the vehicle B on the roadside Y side after the grass cutting work is performed. If the cutting work and the blowing work were performed separately, two vehicles would be required, but in the embodiment of the invention, one vehicle is sufficient. In other words, the grass cutting work can be performed with the work machine A while the cleaning work with the blower H is performed at the same time. When cutting grass outside the shoulder of a road such as a highway, it is not necessary to close the driving lane, and only one vehicle such as a 2-ton truck is required for vehicle B, so the number of personnel involved in the series of operations including grass cutting can be reduced. [Explanation of symbols]

[0110] A work machine Vehicle B C Work Section C1 rotor shaft C2 cutting blade D Frame D1 Grounding part D2 Support part D3 Fixing part E Mast Frame E1 First pivot axis E2 2nd pivot axis E3 Third pivot axis E4 4th pivot axis E5 Fifth pivot axis F Expansion means G Cargo bed H Blower H1 outlet H2 First switching valve H4 First Rapid Coupling H5 2nd rapid coupling H6 1st piping H61 Hydraulic pump M3 side, first piping H62 Hydraulic motor O side first piping H7 Second Piping H71 Hydraulic pump M3 side second piping H72 Hydraulic motor O side second piping H8 First switching block H9 Second switching block H10 Check Valve H11 Second Flow Control Valve H12 Relief Valve H13 Casing H21 Blower control unit J Horse J1 Nozzle J2 Fixing means J3 Band K adjustment part K1 Rod K2 Boss K3 Knob Bolt K4 Bolt M Power Unit M1 Engine M2 Tank (Fuel Tank) M3 Fluid pressure source (hydraulic pump) M4 Directional Control Valve N Base N1 Insertion part O Hydraulic motor O1 Impeller Pa 1st Sensor Unit (Tilt Sensor) Pb Second Sensor Unit P1 Rotary axis P2 pendulum P3 detection member P4 Mounting Base Q1 Center of gravity of implement A alone Q2 Center of gravity of the entire load on the cargo bed G Q3 Center of gravity of counterweight U alone Q3a Center of gravity of counterweight U alone (when located inside the cargo bed) Q3b Center of gravity of counterweight U alone (when located outside the cargo bed) T Actuator (drive source) T1 1st chain T2 2nd chain T3 1st sprocket T4 2nd sprocket T5 3rd sprocket T6 Guide Sprocket T7 connecting member U Counterweight U1 Frame U2 Weight U3 movable platform U4 Rail U5 Support Member U6 Laura U7 Case U8 Sliding member U9 Weight Loading Surface U10 bolt U11 Long side (long side of the frame) U12 Short side (short side of the frame) U13 Nut V Operation section V1 Changeover Switch V2 Operation Switch Y Expressway Y1 shoulder Y2 Off road Y3 support post Y4 Protective Barrier Y5 signs Y51 display board Y52 Reflector Y6 slope 11. First cylinder 12 Second cylinder 13. Third cylinder 14. Fourth Cylinder 15. Fifth cylinder 16. First Boom 17. Second Boom 18 1st connector 19 Second connector 21 Aori 22. Cargo bed fixing part 23 Eyebolts

Claims

1. A movable platform that can move along rails, A weight to be placed on the aforementioned movable platform, It comprises a case located below the rail, which is integrated with the movable base and moves below the rail, The case includes an actuator, which is a drive source for moving the movable base, with one end of the case connected to the case, The other end of the actuator is connected to a first chain, which is arranged to be able to rotate around the actuator by the drive of the actuator, A sprocket made rotatable by the circumferential drive of the first chain, The rotation of the sprocket moves the case, and a second chain moves the case. A counterweight characterized by having the following features.

2. The aforementioned case is provided in a rectangular shape having a short side and a long side in a plan view. The aforementioned weights, in a plan view, have substantially the same projected area as the case and are composed of multiple weights that can be stacked vertically. The actuator is a cylinder arranged to extend and retract in the direction of the long side of the case, The case moves along the lower side of the rail so as to move in the direction of the shorter side of the case by the drive of the actuator, and the case's movement speed is set to be faster than the drive speed of the actuator. The counterweight according to feature 1.

3. The actuator has an operating unit with a changeover switch that can switch between an attitude-linked mode and an independent operation mode, The rail is equipped with a tilt sensor capable of detecting the inclination of the rail in the longitudinal direction, When the operation mode is switched to the attitude-linked mode, the control unit drives the actuator so that when the rail is tilted, the movable base and case move upward in the direction of the rail's inclination, A counterweight according to claim 1 or 2, characterized by comprising the above.

4. The counterweight according to claim 1 or 2, characterized in that it moves when it detects the tilt of the cargo bed.

5. The counterweight according to claim 1 or 2, characterized in that when the tilt of the loading platform is detected, the counterweight moves to the opposite side of the direction of movement of the work unit.

6. A movable platform that can move along rails, A weight to be placed on the aforementioned movable platform, It comprises a case located below the rail, which is integrated with the movable base and moves below the rail, The case includes an actuator, which is a drive source for moving the movable base, with one end of the case connected to the case, The other end of the actuator is connected to a first chain, which is arranged to be able to rotate around the actuator by the drive of the actuator, A sprocket made rotatable by the circumferential drive of the first chain, The rotation of the sprocket moves the case, and a second chain moves the case. A work machine equipped with a counterweight having, A frame to be loaded on the cargo bed of a vehicle and on the front side of the cargo bed, A mast frame that can rotate horizontally relative to the aforementioned frame, An extendable mechanism is provided that is connected to the mast frame at one end and is capable of rotating up and down, The extension mechanism has a working section provided on the other end side, The work unit can change its orientation to an extended state, where it is positioned to the side of one side in the direction of travel of the vehicle, by rotating the mast frame and the telescopic means, and to a retracted state, where it is positioned on the cargo bed, by rotating the mast frame and the telescopic means. The counterweight is loaded on the rear side of the cargo bed and on the side opposite to the direction in which the deployed work section unfolds. A work machine equipped with a counterweight, characterized by the features described above.

7. The aforementioned case is provided in a rectangular shape having a short side and a long side in a plan view. The aforementioned weights, in a plan view, have substantially the same projected area as the case and are composed of multiple weights that can be stacked vertically. The actuator is a cylinder arranged to extend and retract in the direction of the long side of the case, The case moves along the lower side of the rail so as to move in the direction of the shorter side of the case by the drive of the actuator, and the case's movement speed is set to be faster than the drive speed of the actuator. A work machine equipped with a counterweight as described in feature 6.

8. The actuator has an operating unit with a changeover switch that can switch between an attitude-linked mode and an independent operation mode, The rail is equipped with a tilt sensor capable of detecting the inclination of the rail in the longitudinal direction, When the operation mode is switched to the attitude-linked mode, the control unit drives the actuator so that when the rail is tilted, the movable base and case move upward in the direction of the rail's inclination, A work machine equipped with a counterweight according to claim 6 or 7, characterized by having the following features.

9. A work machine equipped with a counterweight according to claim 6 or 7, characterized in that it moves the counterweight when it detects the tilt of the loading platform.

10. A work machine equipped with a counterweight according to claim 6 or 7, characterized in that when the tilt of the loading platform is detected, the counterweight moves to the opposite side of the direction of movement of the work unit.

11. A work machine equipped with a counterweight according to claim 6 or 7, characterized in that the work section and the blower are installed with a gap between them.

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