JPS6159682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for attaching a working machine such as a rotary to an agricultural tractor, and is aimed at simplifying the structure for laterally moving the working machine to the left or right. There is.

Conventionally, in order to improve maneuverability in adjacent plowing work in paddy fields, ridge work, orchard work, etc., it has been known to support working machines such as rotaries so that they can move laterally. Hydraulic movement system,
A screw moving method has been adopted, but there has been a problem of high cost. In other words, the hydraulic or screw system is of excessive quality as a structure when working by moving a rotary or the like to a fixed position left and right (for example, cultivating wet fields).

The present invention focuses on the fact that the working machine moves up and down with respect to the tractor body, and the working machine is offset to the left and right in conjunction with the up and down movement of the working machine, and will be explained below with reference to the drawings.

FIG. 1 is a left side partial view of an agricultural tractor to which the present invention is applied, and FIG. 2 is a front view as seen from the arrow in FIG. 1. In FIG. The front end (left end in the figure) of the link 1 is pivotally supported by the rear end of the body of the tractor, and the rear end is connected to the lower end of the portal frame 3 via the joint 2. The frame 3 is integrally provided with a support shaft 4 extending in the left-right direction at a portion slightly above the joint 2 by welding or other means.
In the figure), a vertical slide fitting 5 and an integral sleeve 6 are slidably fitted. Downward arms 7 provided at both left and right ends of the sleeve 6 are connected to a bracket 9 provided on a rotary work machine 8 via bolts 10. An input shaft 11 protruding forward from the upper front end of the rotary work machine 8 is connected to a PTO shaft on the tractor side via a drive shaft (both not shown) having a universal joint at the front and rear ends, and the sleeve 6 is connected to the support shaft. 4 to the left or right (arrow L' in Figure 2,
Even when the rotary working machine 8 moves laterally with respect to the frame 3 by sliding in the R' direction, rotational force can be smoothly transmitted from the tractor side to the input shaft 11.

A roller guide 13 with a U-shaped cross section that opens downward is fixed to the lower surface of the upper frame member 3a in a posture extending parallel to the support shaft 4 (in the left-right direction). The roller bearing 14 (FIG. 3) is fitted, and the slide fitting 5 can freely move left and right (arrows L', R') while maintaining a substantially vertical posture. A bracket 15 with a U-shaped cross section that opens forward when viewed from above is welded to the upper surface of the left and right center portion of the upper frame member 3a, and an interlocking member supported at two points by a pair of side walls of this bracket 15. The rear end of a top link 17 is rotatably connected to the shaft 16 within the bracket 15, and the front end of the top link 17 is a fulcrum.
It is connected to the top link hitch 18 at the _O1 part. The left and right lower links 1 are connected to the lower end of the lift link 19 at the fulcrum _O2 , and the upper end of the lift link 19 is connected to a lift arm (not shown), so that the operator can lift the lift arm by operating a hydraulic lever. When the lift arm is pulled up, the movement of the lift arm is transferred to the lower link 1 via the lift link 19.
is transmitted, frame 3 rises, and top link 1
7 rotates in the direction of arrow A about the fulcrum _O1 , and the rotary working machine 8 can be moved to the raised position shown in FIG. 1a.

A lower member 21 parallel to the support shaft 4 is welded to the frame 3 at both left and right ends slightly forward of the support shaft 4 (to the left in FIG. 1), and a guide rail 22 is attached to the lower member 21 and the frame upper member 3a. Both left and right edges of the guide rail 22 are bent forward into a U-shape to form a groove 23, and a rectangular first guide plate 24 is fitted into this groove 23 so as to be movable up and down. There is. The first guide plate 24 includes a guide hole 25 whose horizontal width increases as it goes downward, and a pin 26 that protrudes forward at a position slightly below the lower edge of the guide hole 25. At this point, the second guide plate 27 and the hole at the lower end of the switching lever 28 integrated therewith are fitted onto the pin 26, and the lower end of the interlocking rod 30 is connected to the end further forward of the switching lever 28 via a joint 29. , Rod 30
The upper end of is connected to the tip of an arm 32 via a joint 31, and the arm 32 is welded to the tip of the interlocking shaft 16. The base end of a fork 33 is welded to the interlocking shaft 16 within the bracket 15, and the tip of the fork 33 holds the top link 17 from above and below.
Therefore, the arm 32 rotates integrally with the top link 17 via the interlocking shaft 16 and the fork 33.

The switching lever 28 and the second guide plate 27 are welded at their lower ends and extend upward in the same direction from the pin 26, and the second guide plate 27 has a generally smooth diamond shape as shown in FIG. 4, and is switched at the center. It is equipped with a U-shaped neutral groove 35 that opens upward in the same direction as the lever 28, and the switching lever 28 is moved to the R position (rightward movement position) as shown in Fig. 4.
When folded down, the edge 36 and the edge 37 of the guide hole 25 form a guide groove 25r for rightward movement, and the switching lever 2
When moving 8 to L position (left movement position), edge 3
6' and 37' form a leftward movement guide groove that is symmetrical to the guide groove 25r. When the switching lever 28 is set to the C position (neutral position) as shown in FIG. 2, the upper end of the guide hole 25 and the neutral groove 3
5 creates a neutral guide groove 25c that extends in the vertical direction. The upper edge bent portion 24a of the first guide plate 24 has a notch 3 into which the switching lever 28 fits so that the switching lever 28 can be self-held in each of the R, C, and L positions.
Elongated holes having 8r, 38c, and 38l (FIG. 5) are provided, and the engagement between the switching lever 28 and each notch 38 is ensured, for example, by the elasticity of the switching lever 28 itself.

The upper end of a link 41 is pivoted to a backward pin 40 fixed to the upper end of the rear surface (right side in FIG. 1) of the guide rail 22, and the pin 42 projects forward from above the link 41 slightly below the pin 40. , pin 42
is equipped with a bushing 43 in a portion inside the guide hole 25,
In the neutral state shown in FIG. 2, the bush 43 is fitted into the lower end of the vertical neutral guide groove 25c formed by the neutral groove 35 of the second guide plate 27 and the upper end of the hole 25. The link 41 extends further downward from the pin 42, curves backward once slightly above the support shaft 4, and then points downward again, and the elongated hole 44 provided at the lower end and extending in the vertical direction projects rearward from the sleeve 6. It fits into a bushing 46 on the outer periphery of the pin 45. Note that the upper end of the rotary working machine 8 is connected to the upper end of the slide fitting 5 via a link 47.

In the descending posture shown in FIGS. 1 and 2, the top link 17 and the arm 32 are slightly tilted forward and downward, so the angle α between the top link 17 and the guide rail 22 is relatively large. Therefore, the first guide plate 24 is in the raised position, and the switching lever 28 and the second guide plate 27 are set in the neutral position C, so that the pin 42 of the link 41 is at the lower end of the vertical neutral position guide groove 25c. Therefore, the link 41 is vertical and the sleeve 6 is attached to the support shaft 4.
Hold it in the neutral position at the center in the left-right direction. As a result, the rotary work machine 8 occupies a position directly behind the tractor (neutral position).

From this state, when the work machine 8 is lifted up by the lift arm as shown in Fig. 1a, the top link 17
Since the angle α between the arm 32 and the guide rail 22 is significantly reduced, the first guide plate 24 descends within the guide rail 22, and the guide groove 25c also descends, so the pin 42 is attached to the upper end of the guide hole 25. come. When the switching lever 28 is switched to the R side (Fig. 4) in this state, a guide groove 25r for moving to the right is created, and when the work machine is lowered from this state, the pin 42 is moved to the right ( Therefore, the sleeve 6 can be slid on the support shaft 4 in the R' direction via the link 41. The rightward sliding amount of the working machine at that time is Wr in Fig. 2. When the working machine is raised, the switching lever 28 is switched to the L position, and the working machine is lowered, the sleeve 6 moves to the left by a sliding amount Wl.

As explained above, in the present invention, the frame 3 is connected to each of the top link 17 and the lower link 1 on the working machine side, and the frame 3 is provided with a guide member in the left and right direction, that is, a roller guide 13 and a support shaft 4, The work implement 8, which is slidably supported by these guide members, is offset to the left and right in conjunction with the lifting and lowering movements of the work implement 8, so that the work implement 8 can be moved to the left or right with respect to the tractor during work. It can be freely moved horizontally to either side or to a neutral position, greatly improving maneuverability in adjacent plowing work in paddy fields, work along ridges, work in orchards, etc. Moreover, when the hydraulic lever on the tractor body is raised to the upper position and the lift arm is raised to the upper limit during turning and when necessary, the first and second guide plates 24 and 27 are guided by using the angle change of the top link 17, etc. By lowering it within the rail 22, the slide fitting 5 and the rotary working machine 8 can be returned to the neutral position. Then, when the switching lever 28 is manually set to the desired position and the lift arm is moved to the lowered position, the pin 42 on the link 41 moves along the guide groove and uses the weight of the rotary working machine 8 to move the sleeve 6. can be laterally moved to a predetermined position on the support shaft 4. As described above, according to the present invention, there is no need to provide a screw or a hydraulic movement mechanism to move the working machine laterally, and the structure is significantly simpler and cheaper. Moreover, once the switching lever 28 is set at an arbitrary position, the working machine can be laterally moved to a position suitable for the work by simply operating the lift arm, making the operation easy. Furthermore, in the present invention, the first guide plate 24 has a guide hole 25 whose width increases as it goes downward;
5, a second guide plate 27 is pivotally connected to the first guide plate 24 below 5 through a pin 26, and has a substantially diamond-shaped U-shaped neutral groove 35 with an open upper end; and a switching lever 28 fixed to the second guide plate 27. When the switching lever 28 is in the neutral state, the pin 42 fits into the lower end of the vertical guide groove 25c made up of the neutral groove 35 and the upper end of the guide hole 25, thereby switching the switching lever 28 to the left or right side. and the edge 3 of the second guide plate 27
6 and the edge 37 of the guide hole 25 form guide grooves 25l and 25r for leftward or rightward movement, and the guide groove 2
The formation and switching of 5c, 25l, and 25r becomes extremely simple and reliable. Also, an arm 32 protrudes from the upper end of the frame in the same direction as the top link 17 and is integrated with the top link 17, and the arm 32 is connected to the first guide plate 24 to connect the first guide plate 24 to the frame 3 when the frame is raised. Interlocking rod 3 that pushes down
0, a guide member extending in the left-right direction at the upper and lower parts of the frame 3, and a sleeve 6 guided by the lower guide member connected to the work machine, the upper end of which is pivotally connected to the upper part of the frame, and the lower end of which is pivotally connected to the sleeve 6. Since a link 41 having a pin 42 that fits into the guide hole 25 and the neutral groove 35 is combined in the middle part, the pin 42 fits into the guide grooves 25c, 25l, 25r when lowering the work implement 8.
Due to the force received from the working machine, the sleeve 6 can be easily slid on the support shaft 4 using the weight of the working machine, and the force required to operate the switching lever 28 is minimized.

Note that when embodying the present invention, by changing the shapes of the first and second guide plates 24 and 27, it may be configured such that, for example, the upper end is neutral, and the lower end is horizontally moved only to the right or left. .

[Brief explanation of the drawing]

Fig. 1 is a partial left side view of an agricultural tractor to which the present invention is applied, Fig. 1a is a drawing corresponding to Fig. 1 showing the lift-up posture, Fig. 2 is a front view as seen from the arrow in Fig. 2 is a sectional view, FIG. 4 is a partial front view, and FIG. 5 is a view taken in the direction of the arrows in FIG. 4. 1... Lower link, 3... Frame, 8...
Rotary work machine, 4, 13... Support shaft and roller guide (guide portion), 17... Top link.

Claims (1)

[Claims] 1 A top link 17 pivotally connected to the rear end of a top link hitch 18 so as to be able to rise and fall freely;
A gate-shaped frame 3 is pivotally connected to the rear end of each of the pair of lower links 1 on the side of the working machine, and a gate-shaped frame 3 is supported by the frame 3 so as to be able to rise and fall, and has a guide hole 25 whose width increases as it goes downward. 1 guide plate 24 and a pin 26 on the first guide plate 24 below the guide hole 25.
A second guide plate 27 having a U-shaped neutral groove 35 having a substantially rhombic shape and open at the upper end, which is pivotally connected via the switch lever 28 fixed to the second guide plate 27, and a switch lever 28 from the upper end of the frame in the same direction as the top link 17. an interlocking rod 30 that connects the arm 32 and the first guide plate 24 and presses down the first guide plate 24 relative to the frame 3 when the frame rises; a guide member extending in the left-right direction at the lower part, and a sleeve 6 connected to the working machine and guided by the lower guide member;
The link 41 has an upper end pivotally connected to the upper part of the frame and a lower end pivotally connected to the sleeve 6, and has a pin 42 in the middle that fits into the guide hole 25 and the neutral groove 35, and when the switching lever 28 is in the neutral position, the pin 42 is connected to the neutral groove. 35 and the upper end of the guide hole 25
c and when the switching lever 28 is switched to the left or right side, the edge 36 of the second guide plate 27 and the edge 37 of the guide hole 25 form guide grooves 25l and 25r for leftward or rightward movement. A work equipment mounting device for an agricultural tractor.