JPS644944B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-propelled work platform, and more particularly to a self-propelled work platform that is equipped with a work platform whose position is controlled such that it can be raised and lowered, and is used for management work in orchards and the like.

A series of management tasks in orchards, such as pruning,
Work such as artificial pollination, flower thinning, bagging, unbagging, and harvesting must be carried out from low places that can be reached from the ground to high places that require ladders. Since it is necessary to move while performing the work, conventionally, a self-propelled work cart has been used in which a work platform is connected to the work platform so as to be able to move up and down.

By the way, such self-propelled work carts are generally configured so that an operator on the ground can drive them and raise and lower the work platform, and there is an operator in addition to the person working on the work platform. It was necessary. Of course, if an operating means, such as a switch or a hydraulic switching valve, is attached to the workbench to change its elevation, the workbench can be lowered by the worker on the workbench alone, eliminating the need for an operator. However, even in this case, the self-propelled trolley had to be operated from the ground, which was extremely inefficient.

As a means to improve the workability of such a self-propelled work cart, various operating levers are arranged on the work platform side, and various operating members on the self-propelled cart side, such as the engine throttle It is conceivable to connect the lever, the transmission lever of the transmission device, the tension arm of the clutch device, the brake device of the travel system, etc. via an operating wire, but in this case, if the operating wire is routed for a long time, This causes problems such as increased sliding resistance, making it impossible to reliably transmit a predetermined operating force, or making it difficult to transmit a large operating amount. Therefore, it has been extremely difficult to remotely control items that require a relatively large operating force or amount of operation, such as the gear shift lever of a transmission device.

In addition, it is preferable for such self-propelled work carts to be equipped with a ground stabilizing device, as the center of gravity becomes high when working with the work platform elevated, which poses the risk of tipping over. For relatively small and low-horsepower devices, it is difficult to apply hydraulically driven devices such as those installed on crane trucks due to installation space and drive horsepower, and the cost is high, so it is preferable. do not have. Furthermore, when working in orchards with sloped surfaces, it is necessary to maintain the horizontal position of the workbench, and in order to be able to work near the center of the fruit trees, the workbench must be designed to be extendable. will come. In this way, when used in orchards, etc., in addition to driving operability, ground stability,
Workability on a workbench is required.

It is an object of the present invention to meet these demands and provide a self-propelled work trolley that can satisfactorily perform work in orchards and the like.

For this purpose, the present invention provides a self-propelled work cart as described above, which is attached along the constituent members of the telescoping link mechanism, and which connects the operating member on the work platform side and the operated member on the self-propelled cart side. a chain transmission mechanism, a ground stabilizing frame that is attached to the body frame of the self-propelled trolley so that it can move toward and away from it in the left-right direction, and a jack that supports the support base so that it can tilt in the left-right direction with respect to the body frame of the self-propelled trolley. , and an extension plate that can extend from the workbench in the width direction.

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the drawings.

In the self-propelled work carts shown in FIGS. 1 and 2, reference numeral 1 denotes a self-propelled cart, and a work table 3 is connected above the self-propelled cart via a telescopic link mechanism 2 so as to be vertically movable.

The self-propelled trolley 1 is equipped with an engine 6, a transmission device 7, etc. arranged on a body frame 5 with a crawler traveling device 4 at the bottom, and the output of the engine 6 is decelerated by the transmission device 7 to perform crawling at each gear stage. This configuration is similar to the conventional one. In addition, in this example,
Although the self-propelled trolley 1 is configured to travel on crawlers, it goes without saying that it may be configured to travel on wheels.

Here, ground stabilizing frames 8, 8 for preventing overturning are attached to the body frame 5 of the self-propelled trolley 1. This ground stability frame 8 has a main body formed in a substantially C-shape that is vertically elongated in plan view and surrounds the front, rear, and outer sides of the rubber crawler 9 of the crawler traveling device 4, and has a pair of front and rear support arms extending toward the vehicle body frame 5 side. By inserting the support arms 10, 10 into the frame 5 and fixing them with bolts, the ground stabilizing frame 8 can be moved to a stored position surrounding the rubber crawler 9 and from which it extends in the left and right direction. A pair of such ground stabilizing frames 8 are provided on the left and right sides of the frame 5. Note that the ground stabilizing frame 8 body and the support arm 10 are not on the same plane, but have a step above and below, and the support arm 1
If this is inserted into the vehicle body frame 5 with 0 facing upward, the ground stabilizing frame 8 body will be close to the ground, and in contrast to this installation state, the support arm 10 will be inserted into the vehicle body frame 5.
When it is set to the lower side, the ground clearance of the ground stabilizing frame 8 is increased.

Further, on the vehicle body frame 5, a support stand 12 is disposed on which a pair of left and right guide rails 11, 11 extending in the front and rear direction are stretched to support the lower end portion of the telescopic link mechanism 2. This support stand 12 is hinge-coupled to the vehicle body frame 5 via support legs 13 at two locations in the front and rear on one side in the left and right direction, and the substantially central portion in the front and rear direction on the opposite side is connected to the vehicle body frame 5 via a pantograph type jacking device 14. It is supported on 5. The jacking device 14 has its upper and lower ends hinged to the support stand 12 and the vehicle body frame 5, respectively, so that when the crank handle 15 is operated to expand and contract in the up and down direction, the support stand 12 can be tilted left and right. There is. Note that the jacking device 14 is not limited to the pantograph type, but may be a threaded rod type jack, an electric jack, or a hydraulic jack.

Next, the telescopic link mechanism 2 has a pair of left and right components whose lower ends are rotatably connected to the front ends of the guide rails 11, 11 via a pivot 16, and which are partially connected by a connecting plate. link arms 17, 17, and the lower end is the guide rail 11,
A pair of left and right link arms 18, 1 which are roller-coupled to 11 and partially connected to each other in the same manner as above.
8, these link arms 17 and 18 intersect in an X-shape when viewed from the side, and the intersecting portion is connected to a pivot shaft 19.
They are rotatably connected to each other via. A hydraulic cylinder device 20 is interposed between the link arms 17 and 18 via a mounting rod in order to relatively rotate each link arm 17 and 18 and move the upper end position of the link arm up and down. Each link arm 17, 17, of the telescopic link mechanism 2 configured in
A workbench 3 is connected to the upper ends of 18, 18. That is, a pair of left and right guide rails 22, 22 extending in the front-rear direction are stretched on the lower surface of the floor plate 21 of the workbench 3, and the upper ends of the link arms 18, 18 are connected to the guide rails 22, 22 via a pivot 23. 22
The upper end of the other link arm 17, 17 is connected to the guide rail 22, 22.
The working table 3 is moved up and down while maintaining a substantially horizontal position by the operation of the telescopic link mechanism 2.

The work table 3 has a floor plate 21 wider than the support table 12.
, and left and right side plates 24, 24 which also serve as extension plates are rotatably attached to the left and right ends thereof, and an operation box 26 having a handle 25 is fixed to the front end of the floor plate 21. The operation box 26 is located at a height that is sufficiently accessible from the ground at the lowering limit of the workbench 3. This operation box 26 includes a hydraulic lever OL and a throttle lever.
TL, tension clutch lever CL, which also serves as a brake lever, and a pair of left and right side clutch levers.
SL and SL are provided, and these are each connected to the corresponding operation member on the self-propelled truck 1 side via each operation cable C, and the expansion and contraction of the hydraulic cylinder device 20 is controlled by operating the hydraulic lever OL, and the slot The torque lever TL controls the rotation speed of the engine 6, and the tension clutch lever CL switches on and off the power transmission from the engine 6 to the transmission device 7, and brakes the crawler traveling device 4 according to the switching state.
It is configured to perform a braking release switching operation and also to perform a steering operation of the self-propelled trolley 1 using the left and right side clutch levers SL, SL.

Further, on both left and right end surfaces of the floor plate 21, as shown in FIG.
As shown in FIG. 4, support brackets 27 are provided protrudingly at two locations, front and rear, and on these support brackets 27, engagement members 28, which will be described later and are welded to the ends of the side plates 24, are rotatably mounted. A mounting shaft 29 is formed to attach the side plates 24, 2.
4 is configured to be rotatable with respect to the floor plate 21. A stopper mechanism 30 is provided to hold the side plate 24 in an upright position and a horizontal position with respect to the floor plate 21. That is, the engagement member 28, which is fixed to the end of the side plate 24 and pivoted to the mounting shaft 29, has engagement notches 31 at two locations on the circumference with an angular interval of approximately 90 degrees.
32 is formed, and on the other hand, on the floor plate 21 side, a locking member is formed with a locking pawl 33 at one end that selectively engages with the engagement notch 31 or 32, and has an operating handle 34 at the other end. 35 is pivotally mounted, and this engaging member 35 is given the tendency to rotate in one direction by a spring bias so that the engaging state of the engaging claw 33 with respect to the above-mentioned engaging notch 31 or 32 is maintained. It's summery. The engagement member 28 is fixed to the side plate 24 in such a manner that one engagement notch 31 of the side plate 24 is engaged with the locking pawl 33 in the upright position, and the other engagement notch 32 is engaged with the engagement claw 33 in the horizontal position. be done. The stopper mechanisms 30 configured as described above are arranged in pairs on the left and right at the front and rear ends of the floorboard 21, and each of the stopper mechanisms 30 arranged in the front and rear has its locking member 35 pivoted to the floorboard 21. An interlocking structure is achieved by sharing the shaft 36. Further, an extension plate 37 is provided on the outer surface of the left and right side plates 24, 24, as shown in FIG. 5, and is supported in a horizontal position of the side plate 24 so as to be slidable outward from the side plate 24. A handle 38 with a locking mechanism attached to the side plate 24 is attached to the distal end of the extension plate 37, so that the extension plate 37 can be held in a stored state where it overlaps with the side plate 24. Note that the extension plate 37 may be stored inside the side plate 24 and pulled out from its upper end surface.

A lifting lever 40 is pivotally attached to the lower end surfaces 39 of the left and right side plates 24, 24 so as to be rotatable along the lower end surfaces 39, and a stopper 41 for locking the lever 40 is welded to the lower end surfaces 39 of the left and right side plates 24, 24. and a spring 42 is provided which urges the lever 40 to rotate toward the stopper 41 side.As shown in FIG. It is designed so that it can be rotated so that it can be extended in the opposite direction.

Note that at the lower end of the side plate 24 mentioned above, although not shown, the side plate 24 protrudes inward at a substantially right angle.
Stopper members that come into contact with the upper surface of the floor plate 21 in the upright position of the side plates 24 are provided at appropriate locations to prevent the side plates 24 from falling inward in the upright position.

A chain transmission mechanism 43 is provided in the telescoping link mechanism 2 so that the workbench 3 can transmit power to the self-propelled trolley 1.

As shown in FIG.
A drive sprocket 45 is rotatably attached to a boss, and operating arms 46 and 47 are attached to a pivot shaft 16 on the side of the guide rail 11 stretched over the support base 12, and these are attached to a hub. A driven sprocket 48 in which both arms 46 and 47 are arranged opposite to each other on the diameter line of the boss and respectively protrude outward.
is attached rotatably, and both link arms 1
A pair of intermediate sprockets 49 integrally connected to each other are rotatably attached to the pivot shaft 19 that intersects 6 and 18. Transmission chains 50 and 51 are wound between the drive sprocket 45 and the intermediate sprocket 49, and between the intermediate sprocket 49 and the driven sprocket 48, the distance between the axes of which remains unchanged regardless of the expansion/contraction state of the telescopic link mechanism 2. It has been done. At this time, the transmission chains 50 and 51 are associated so that when the operating lever 44 on the driving sprocket 45 side is in the upright state, the operating arms 46 and 47 on the driven sprocket 48 side are distributed and arranged on both the left and right sides of the link arm 17. . Note that the transmission chains 50 and 51 may be ordinary ones in which each link is connected in an endless manner, but it is preferable that the transmission chains 50 and 51 have a function of transmitting the rotation of the drive sprocket 45 at a predetermined angle to the driven sprocket 48 via the intermediate sprocket 49. Since this is sufficient, in this embodiment, as shown in FIG. 7, each sprocket 45, 48,
The straight portion that does not mesh with the chain 49 is replaced by a link rod 53 whose intermediate portion is connected by a turnbuckle 52, so that the tension of the chain can be adjusted. Alternatively, for example, the drive sprocket 45 may be provided on the link arm 18, the distance between which and the intermediate sprocket 49 remains constant. In this case, by arranging the drive sprocket 45 near the pivot shaft 23, the effect of a change in the position of the operating lever 44 due to the expansion/contraction state of the telescoping link mechanism 2 can be substantially ignored. Furthermore, the chain transmission mechanism 4 used in this example
Instead of 3, a winding transmission mechanism using a timing belt may be adopted, and the important point is to construct a winding transmission mechanism without slips.

The chain transmission mechanism 43 having such a configuration is connected to the self-propelled trolley 1 via a relatively short control wire.
The transmission device 7 is connected to the transmission device 7. That is, the seventh
As shown in the figure, one end of inner wires 56, 57 of a pair of control wires 54, 55 are connected to the ends of the operating arms 46, 47 of the driven sprocket 48, and the other end of the inner wires 56, 57 are connected to the operation arms 46, 47 of the driven sprocket 48. are connected to both ends of a rotary operation plate 59 attached to the upper end of a rotary type transmission shaft 58. Then, the inner wire 5
The sheaths 60 and 61 that guide the sheaths 6 and 57 are connected and fixed at one end to a wire bracket 62 that is supported by an immovable member on the side of the support stand 12 and is arranged facing the operation arms 46 and 47 at a predetermined interval. At the same time, the other end is the transmission case 6.
3 and is connected and fixed to a wire bracket 64 which is arranged opposite to the rotating operation plate 59 at a predetermined interval.

The self-propelled work cart configured as described above can perform all the lifting and lowering operations of the work platform 3 and various driving operations of the self-propelled cart 1 on the work platform 3, so that various driving operations can be performed on the ground as in the past. There is no need for an operator to do this. To explain how this is used, for example, along with harvesting work in an orchard, first, when harvesting fruit at a relatively low ground clearance, the hydraulic lever OL placed in the operation box 26 on the side of the workbench 3 must be operated. The hydraulic cylinder device 20 is operated for harvesting. As a result, both link arms 17 and 18 of the telescopic link mechanism 2 rotate relative to each other around the pivot shaft 19, lowering the position of their upper ends, and lowering the guide rail 22 integrated with the workbench 3, so that the workbench 3 becomes a support base. It will be lowered to just above 11. Therefore, the harvesting work is performed on the floor plate 21 of the workbench 3. At this time, a wide working space can be obtained by extending the side plates 24, 24 to the left and right sides by operating the stopper mechanism 30. That is, from the state shown in Figure 3,
After swinging the operating handle 34 of the locking member 35 upward slightly to release the engagement between the locking claw 33 and the engagement notch 31 on the engagement member 28 side, the side plate 24 is lowered from the upright position to the horizontal position. do. Then, at that position, the operating handle 34 is returned to its original position according to the spring bias, and the locking pawl 33 is engaged with the other engagement notch 32. This state is shown in FIG.
The rotational moment acts on the pivot shaft 36 of the locking member 35 via the locking pawl 33, and since this pivot shaft 36 is pivotally connected to the floorboard 21, the side plate 24 has a horizontal posture with respect to the floorboard 21. It is maintained. Since the stopper mechanism 30 is provided independently for each of the left and right side plates 24, 24, it is possible to hold only one side plate 24 in a horizontal position, or to hold both side plates in a horizontal position to obtain a wide working space. It can be used appropriately depending on the size of the work place or the space where the harvested products are placed. Regarding one of the side plates 24, the stopper mechanisms 30 are respectively disposed at the front and rear ends of the workbench 3 and are configured to interlock with each other.
It is highly workable in raising and lowering operations.

Harvested fruits are normally stored in a storage box placed on the floor board 21, but when loading and unloading this storage box, the left and right side boards 24, 24 are placed on the floor board 21 as shown in FIG.
is rotated downward by the release operation of the stopper mechanism 30 and hangs down on the floorboard 21. In this state, side plate 2
Since the lower end surface 39 of 4 faces upward and the lifting lever 40 can be rotated, the lifting lever 40 can be extended to the outside of the floorboard 21 after loading and unloading the storage boxes. By pulling upward, the side plate 24 can be returned to the upright position from above the workbench 3. Of course, the side plate 24 can also be operated up and down directly from the ground.

Next, when harvesting fruits at a high ground level that cannot be harvested from the workbench 3 on the ground or in the lowered position, the hydraulic cylinder device 20 is extended by operating the hydraulic lever OL, contrary to the above. This causes the telescopic link mechanism 2 to extend and move the workbench 3.
to rise. Therefore, when the workbench 3 reaches a predetermined height position, the extension operation of the hydraulic cylinder device 20 is stopped by operating the hydraulic lever OL to maintain the workbench 3 at a predetermined height above the ground. Harvesting work on the workbench 3 is almost the same as described above, but as the workbench 3 rises, the center of gravity becomes higher, so if you want to perform the harvesting work in such conditions, it is necessary to install the ground stabilization frame 8 in advance. It is pulled out to the left and right from the body frame 5 of the self-propelled trolley 1. At that time, the ground stability frame 8
is attached to the vehicle body frame 5 with the support arm 10 facing upward. By doing so, the horizontal ground contact width and front and rear ground contact width are expanded when the self-propelled trolley 1 tilts to some extent, and even when the work platform 3 is placed at the upper limit, it can be stably supported. In high-place work using such a ground stabilizing frame 8, as shown in FIG. You can also pull it out and work on it. By doing so, it is possible to easily harvest fruits located in the central part of the fruit tree that is further away from the self-propelled cart 1.

When the fruit trees to be harvested are on a slope, the self-propelled cart 1 is arranged with its left and right sides along the slope line. In this state, the support base 12 is inclined in the left-right direction along the above-mentioned inclination line, so the jacking device 14
The support base 12 is kept in a horizontal state by appropriately expanding and contracting it using the crank handle 15. Then, as described above, the harvesting work is carried out by raising and lowering the work table 3 as appropriate.

Here, when moving the self-propelled work trolley to another fruit tree to be harvested, first insert the ground stabilizing vehicle body frame 8 into the vehicle body frame 5 with its support arm 10 facing downward, Leave this in the storage position. By doing so, it will not be an obstacle to running, and the crawler 9 can also be protected. After such preliminary preparations, the self-propelled trolley 1 is operated by operating the operation box 26 and the operation lever 44 on the workbench 3 side. First, the tension clutch lever CL is operated to cut off power transmission from the engine 6 to the transmission device 7, and the crawler traveling device 4 is braked, and in this state, the operating lever 44 is operated to swing. This swinging motion of the operating lever 44 is caused by the drive sprocket 45, transmission chain 50,
It is transmitted to the driven sprocket 48 via the intermediate sprocket 49 and the transmission chain 51, thereby rotating its operating arms 46, 47. These operating arms 46 and 47 are connected to a pair of control wires 5
4 and 55, the rotation operation plate 5 of the mission device 7
9, the swinging motion of the operating lever 44 in one direction is transmitted to the rotary operating plate 59 as a rotating motion in one direction, and the swinging motion of the operating lever 44 in the other direction is similarly transmitted to the rotating operating plate 59. The rotational movement of the rotational operation plate 59 is transmitted in the other direction. Since the rotary operation plate 59 is rotated in accordance with the amount of swing operation of the swing lever 44, the rotary speed change shaft 58 of the transmission device 7 is operated to change the speed as appropriate by the operation lever 44. Therefore, after switching to a predetermined gear stage using the operating lever 44, the tension clutch lever CL is operated to release the brake on the crawler traveling device 4 and connect power transmission from the engine 6 to the transmission device 7. . This drives the crawler traveling device 4 of the self-propelled trolley 1, so that the self-propelled trolley 1 can freely travel within the orchard by steering the left and right side clutch levers SL, SL. At this time, the self-propelled cart 1 runs on rubber crawlers 9, 9, which have a large ground contact area and a low ground pressure, so that the roots of the fruit trees are not damaged.

Since the operation box 26 is placed on the side of the workbench 3, it goes without saying that the self-propelled cart 1 can be operated on the workbench 3 regardless of the up/down position of the workbench 3. Since the operation box 26 can be operated from the ground in the lowered position, the self-propelled trolley 1 can be operated while traveling on the ground. Therefore, by leaving the side plates 24, 24 hanging down from the floorboard 21 as shown in FIG. 6, it is possible to easily pass under fruit trees with low overhanging branches.

As explained above, according to the present invention, there is no need for a long operating wire in the connection structure between the operating lever on the workbench and the operating member on the self-propelled trolley side, and the majority of the operating wire is composed of a chain transmission mechanism. The operating force and amount of operation of the operating lever can be reliably transmitted to the operating member. Moreover, since the chain transmission mechanism described above is capable of transmitting power regardless of the ascending and descending position of the workbench, it is possible to operate the operating member on the self-propelled trolley side while the workbench is held in any ascending and descending position. Therefore, it is now possible to remotely control the speed change lever of the transmission device from the workbench, which was previously considered extremely difficult, and the self-propelled work cart can be operated not only from the ground but also from the workbench. You will be able to do all of these things. In addition, since the grounding width of the self-propelled work platform can be increased by the action of the ground stabilizing frame, safe work can be performed without the risk of falling even when the work platform is in the raised position. In addition, the support platform can be tilted left and right with respect to the vehicle body frame by operating the jack, so even if the self-propelled cart is tilted left and right, the work platform can be leveled by adjusting the support platform to a horizontal position. Therefore, work on slopes can be carried out safely. Furthermore, by using an extension plate, it is possible to work in a position that extends beyond the horizontal width of the workbench, so you can work from the periphery to the center of the fruit tree with the self-propelled work cart placed around the fruit tree. It has the effect of being particularly excellent in workability in orchards, etc., as it can perform all of the above, and is extremely easy to work with.

[Brief explanation of drawings]

FIG. 1 is an overall side view of a self-propelled work trolley according to an embodiment of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a front view showing the mounting structure of a mounting plate to a floor plate.
Fig. 4 is a plan view of the essential parts, Figs. 5 and 6 are explanatory diagrams showing the rotational position of the side plate, and Fig. 7 is a schematic overall diagram showing the interconnection structure from the operating lever to the transmission shaft of the transmission device. FIG. DESCRIPTION OF SYMBOLS 1... Self-propelled trolley, 2... Telescopic link mechanism, 3... Workbench, 4... Crawler traveling device, 5... Vehicle body frame,
6... Engine, 7... Mission device, 8... Ground stability frame, 12... Support stand, 14... Jacket device, 17, 18... Link arm, 20... Hydraulic cylinder device, 21... Floor plate, 24... Side plate, 26... Operation box , 28... Engagement member, 30... Stopper mechanism, 35... Locking member, 37... Extension plate, 40... Pulling lever, 43... Chain transmission mechanism, 44... Operation lever, 45... Drive sprocket, 46, 47...
Operation arm, 48... Driven sprocket, 49... Intermediate sprocket, 50, 51... Transmission chain, 5
2... Turnbuckle, 53... Link rod, 5
4, 55... Control wire, 56, 57... Inner wire, 58... Rotary type speed change shaft, 59... Rotating operation plate.

Claims (1)

[Claims] 1. In a self-propelled work cart in which a work platform is movably supported on a support base of the self-propelled cart via a telescoping link mechanism, an operating member on the work platform side and a self-propelled work platform attached along the constituent members of the telescoping link mechanism. a chain transmission mechanism that connects the operated member on the running truck side;
A ground stabilizing frame that is attached to the body frame of the self-propelled trolley so that it can move toward and away from it in the left-right direction; a jack that supports the support base so that it can tilt in the left-right direction with respect to the body frame of the self-propelled trolley; A self-propelled work trolley characterized by being equipped with an extension plate that can be extended in any direction.