JPS6145764Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for attaching a working machine such as a rotary to an agricultural tractor, and its purpose is to simplify the structure for horizontally 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. 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 (left side in Fig. 1), and a guide rail 22 is fixed integrally to the lower member 21 and the frame upper member 3a, and both left and right edges of the guide rail 22 are bent forward into a U-shape to form a groove 23, into which a rectangular first guide plate 24 is fitted so as to be able to move up and down. The first guide plate 24 is provided with a guide hole 25 whose left and right width increases as it goes downward, and a pin 26 which protrudes forward at a position slightly below the lower edge of the guide hole 25, and a hole at the lower end of a second guide plate 27 and a switching lever 28 integral with it are fitted onto the pin 26 on the front surface of the first guide plate 24, and the lower end of an interlocking rod 30 is connected via a joint 29 to the end further forward of the switching lever 28, and the rod 30
The upper end of the link 17 is connected via a joint 31 to the tip of an arm 32, 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 inside of the bracket 15 on the interlocking shaft 16, 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 is fitted 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 becomes vertical and holds the sleeve 6 at a neutral position in the center of the support shaft 4 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 work 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. And the switching lever 28
Manually set the lift arm to the desired position and place the lift arm in the lowered position, the pin 42 on the link 41
is moved along the guide groove, and the sleeve 6 can be laterally moved to a predetermined position on the support shaft 4 by using the weight of the rotary working machine 8. 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.

In the present invention, the lateral width of the upper end of the guide hole 25 is narrow enough to fit the bush 43 of the pin 42, and the lateral width increases as it goes downward, so that when the work machine is raised, the pin 42 is inserted into the guide hole. A second guide integrally has a guide lever 28 so that the work machine is held in a neutral position when the work machine reaches the upper end of the work machine 25, and from there the work machine can be guided to the left or right offset position by using the work machine's own weight. A plate 27 is provided to form a rightward movement guide groove 25r and a leftward movement guide groove between the first guide plate 24 and the second guide plate 27. Therefore, the sleeve 6 can be moved laterally by the sliding amounts Wr and Wl in conjunction with the descending movement of the work implement using only its own weight.
As described above, according to the present invention, the weight of the work equipment can be used to offset the work equipment from the neutral position when ascending to the left and right offset positions in the descending position, so lateral movement is easily possible without requiring special power. Switching lever 28 for lifting the left and right offset of the rotary
To select L or R, the left offset can be achieved by creating a guide groove on the left side, the rotary descends following the guide groove, and can be completely offset to the left at the end of the descent. The same applies to the right offset. Since the offset of the work equipment is linked to the lowering operation,
Even when the work machine collides with a side wall, etc., no excessive force is applied to the work machine, improving durability.

Furthermore, in the present invention, a first guide plate 24 has a guide hole 25 whose width increases as it goes downward;
A second guide plate 27 is pivotally connected to the first guide plate 24 below the guide hole 25 via a pin 26 and has a substantially diamond-shaped U-shaped neutral groove 35 with an open upper end; and a switching device fixed to the second guide plate 27. By combining with the lever 28, when the switching lever 28 is in the neutral position, the pin 4
2 fits into the lower end of the vertical guide groove 25c consisting of the neutral groove 35 and the upper end of the guide hole 25, 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 guide hole 25 The edge 37 forms guide grooves 25l, 25r for leftward movement or rightward movement, making formation and switching of the guide grooves 25c, 25l, 25r extremely simple and reliable. Further, 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;
an interlocking rod 30 that connects the first guide plate 27 and pushes down the first guide plate 24 relative to the frame 3 when the frame rises; a guide member that extends in the left-right direction at the top and bottom of the frame 3; and a lower guide that is connected to the work machine. The sleeve 6 guided by the member is combined with a link 41 whose upper end is pivoted to the upper part of the frame and whose lower end is pivoted to the sleeve 6 and has a pin 42 in the middle that fits into the guide hole 25 and the neutral groove 35. When lowering the work equipment 8, the pin 42 is inserted into the guide grooves 25c, 25.
Due to the forces received from 1 and 25r, 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. In addition, in the present invention, the guide hole 25 and the neutral groove 35 are provided with a pin 42 and a bush 43.
, the bush 43 contacts the edge of the guide hole 25 and the edge of the neutral groove 35 and tries to attach to the side with greater contact resistance, but the bush 43 Since the pin 42 is rotatable within the guide hole 25 and the neutral groove 30, relative movement of the pin 42 within the guide hole 25 and the neutral groove 30 becomes smooth, local wear is reduced, and durability is improved.

[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 in the direction of the arrow in Fig. 1, and Fig. 3 is a 2 is a cross-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 member), 17... Top link.

Claims (1)

[Scope of utility model registration request] A top link 17 is pivotally connected to the rear end of the top link hitch 18 so as to be able to rise and fall freely, and a portal frame 3 is pivotally connected to the rear end of the top link 17 and the rear end of each of the pair of lower links 1 on the working machine side. , a first guide plate 24 that is supported by the frame 3 in a vertically movable manner and has a guide hole 25 whose width increases as it goes downward; and a substantially diamond-shaped first guide plate 24 that is pivotally connected to the first guide plate 24 below the guide hole 25 via a pin 26. U-shaped neutral groove 3 with open top end
5 and the second guide plate 2
7, an arm 32 that 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 and the first guide plate 24 are connected to each other when the frame is raised. An interlocking rod 30 that pushes down the first guide plate 24 with respect to the frame 3, a guide member that extends in the left-right direction at the upper and lower parts of the frame 3, a sleeve 6 that is connected to the work machine and guided by the lower guide member, and an upper end that is connected to the frame 3. A link 41 is provided at the upper and lower ends of which are pivotally connected to the sleeve 6, and which has a pin 42 in the middle that fits into the guide hole 25 and the neutral groove 35 via a bush 43. The bush 43 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, 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 guide hole A work equipment mounting device for an agricultural tractor in which guide grooves 25l and 25r for leftward movement or rightward movement are formed by edges 37 of 25.