JPH0440406Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a forward and reverse rotary tiller.

(Prior Art) In general, a forward-reversing rotary tiller includes a main cover that covers the upper part of a tilling section that can be forward and reverse, a rear cover that covers the rear of the tilling section and is swingable about the left and right horizontal axes. It is provided with comb-shaped rake members that are located between the tilling section and the rear cover, are swingable about the left and right horizontal axes, and are arranged in a row at intervals in the tilling width direction. The rake member is oscillatingly positioned so as to be close to the tilling section to produce a soil crushing effect when tilling in reverse rotation, and moved away from the tilling section when tilling in forward rotation to prevent entanglement with grass, etc. It is pivotally positioned towards the rear cover.

In addition, the rake components are suitable for fields (clay, sand).
Providing this may be effective or disadvantageous depending on the situation.

Conventionally, the above-mentioned rocking positioning of the rake member has been carried out by selectively latching the rake member to different positions of the machine frame of the tiller via a locking device, as disclosed in Japanese Patent Laid-Open No. 61-88801. This was what I was doing.

In addition, the rake member was attached and detached by tightening and loosening the bolts each time the rake member was needed.

(Problems to be Solved by the Invention) In the conventional device, it was necessary to attach and detach the hook to the machine frame every time the position of the rake member was changed, which was troublesome.

In addition, the rocking fulcrum of the rear cover and rake member is generally clogged with soil and cannot swing smoothly.
There is a problem in that soil tends to get stuck between the rear cover and the rake member during forward tilling.

Therefore, a structure for preventing the rake member from falling off as shown in FIGS. 9 and 10 can be considered.

In Figures 9 and 10, 1 is the main cover, 2
is a rear cover, which is swingable in the vertical direction about the horizontal shaft 3 as a fulcrum. 4 is a rake mounting shaft, to which a rake member 7 is mounted via a mounting bracket 5 and a bolt 6.

Brackets 8 are provided at both left and right ends of the rear cover 2, and have lock pin insertion holes 9.

10 is a receiving rod, which is fixed to the mounting bracket 5.

Reference numeral 11 denotes a lock pin, which can be inserted into and removed from the insertion hole 9 from the inside to the outside, and its outer end is fixed with a nut 12.

That is, in order to place the rake member 7 on the rear cover 2 and prevent it from falling off, lift the rear cover 2 and the rake member 7 together, and then lift the receiving rod 10.
is supported by the locking pin 11.
1 and secure it with a nut 12.

Although the comparative examples shown in Figures 9 and 10 are useful in their own way, they require a lot of effort to lift the rear cover 2 and insert and remove the pins, and because they are heavy objects, manual work is labor intensive. It becomes labor.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The technical measures taken by the present invention to solve the problems of the prior art are characterized by: ,
A rear cover 32 that covers the rear of the tilling section 22 and is swingable around the left and right horizontal axes; comb-shaped rake members 19 arranged in a row at intervals, a rake holder 59 for holding the rake member 39 is composed of a receiver 60 and a support rod 61, and the receiver 60
is provided inside the rear cover 32 and is provided inside the rear cover 32 so that the posture can be freely changed between a posture A along the longitudinal direction of the rake and a posture B crossing the longitudinal direction of the rake.
1 protrudes through the rear cover 32, and the receiver 60 has a length to receive a plurality of rake members 39.

(Function) To fix the rake member 39 along the rear cover 32, use the receiver 60 in the rake holder 59.
In the example of Fig. 3, the support rod 61 changes from posture A to posture B.
By rotating around the axis of the wing nut 6
This is done by fixing with 4.

In the example shown in FIG. 2, the receiver 60 of the rake holder 59 is pushed down against the spring 66 and rotated around the axis of the support rod 61 to cause the receiver 60 to intersect (cross) the rake member 39. This is done by supporting the rake member 39.

(Example) In FIGS. 7 and 8, a rotary tiller 2 is connected to a tractor (not shown) via a three-point link.
0 is a side drive type and can be rotated forward and backward,
Machine frame 21, forward/reverse tilling section 22, and this tilling section 2
2, and a cover device 23 that covers 2.

The machine frame 21 has support arms 24 integrally protruding from the gear case on the left and right sides, and these left and right support arms 2
A side frame 25 and a chain case 26 are provided at the outer end of the chain case 4 to form a gate shape. A rearwardly protruding support frame 27 is supported on the machine frame 21 so as to be rotatable around a horizontal axis, and a gauge wheel 28 is provided at the rear end of the support frame 27.

The tilling section 22 is supported by a claw shaft rotatably supported around a horizontal axis between the lower end portions of a side frame 25 and a chain case 26, and a bracket installed on the claw shaft so as to be swingable at a constant angle via a bolt 29. A tilling claw 29 is provided. Since the claw shaft is interlocked and connected to the gear case via the chain in the chain case 26 and the transmission shaft in the support arm 24, the tilling claws 29 can till the soil by rotating in either forward or reverse direction. . The forward and reverse rotation of the pawl shaft is switched by a forward and reverse mechanism inside the gear case 30.

The cover device 23 includes a main cover 3 shown in FIG.
1. It includes a rear cover 32, left and right side covers 33, and a front cover 34.

The main cover 31 covers the top of the tilling section 22 and is fixed to the machine frame 21 via a bracket. Further, as shown in FIG. 6, inverted L-shaped mounting brackets 35 are attached along the left and right side walls of the main cover 31 so as to extend downward.

The left and right side covers 33 are attached to the mounting bracket 35 and extend downward from the left and right side edges of the main cover 31 to cover the left and right outer sides of the tilling section 22.

The rear cover 32 covers the rear of the tilling section 22, as shown in FIGS. 1 and 2. The rear cover 32 is pivotally supported by the left and right side covers 33 at the rear end position of the main cover 31 on a bridge-shaped first left and right horizontal shaft 36, and is swingable about the horizontal shaft center P. Also,
The rear cover 32 is held by a holding rod 38 that is elastically attached to the machine frame 21 via a spring 37 so as to be vertically movable, so as to be able to swing within a predetermined range.

A comb-shaped rake member 39 located between the tilling section 22 and the rear cover 32 is connected to the second left and right horizontal shaft 4.
0 and is swingably provided around the horizontal axis center Q. The second left and right horizontal shafts 40 are the left and right guide covers 3
The horizontal axis center P of the rear cover 32 is an eccentric horizontal axis center Q, and this horizontal axis 4
0, a rake mounting bracket 41 is fixed to the bracket 41, and a rake member 39 is fixed to this bracket 41. The rake member 39 is a large number of U-shaped rods arranged side by side at predetermined intervals in the left and right direction.
The character rod is clamped and attached by a holding plate 42 and a bracket 41 via bolts and nuts 43.

Further, semicircular elastic bodies 44 are fixed to the left and right ends of the bracket 41.

A soil protection cover 45 is provided between each horizontal axis center P, Q and the tilling section 22 to prevent soil scattered from the tilling section 22 from clogging the rear cover 32 and each swinging fulcrum part of the rake member 39. It is provided. As shown in FIGS. 1 and 2, this soil protection cover 45 has a front end fixed to the lower surface of the main cover 31, and a rear end fixed to the lower surface of the rear end of the main cover 31 via a U-shaped member 46. Next, 47 is the left and right side cover 3
The rake member swing operating device is provided on each outer surface of the side cover 33, and includes a mounting plate 48 that is attached to the outer surface of the side cover 33. The end is penetrated, and a locking nut 49 is screwed into the penetrating end of the first left and right horizontal shaft 36 (see FIG. 6). Also,
A base end of a driven arm 50 is fitted into the penetrating end of the second left and right horizontal shaft 40 so as not to be relatively rotatable, and is fixed via a nut 51 . Further, a support shaft 52 is provided protruding outward from the mounting plate 48 to the left and right, and this support shaft 52
The base end of the operating arm 53 is attached to be swingable about the left and right horizontal axes. And the operation arm 53
Spring support shafts 54 and 55 are provided at each end of the driven arm 50 to protrude outward from the left and right, and a tension coil spring 56 is latched thereto. Note that the spring support shaft 54 on the side of the operating arm 53 is protruded inwardly in the left and right directions and serves as a gripping portion. Due to the moment based on the elastic force of the spring 56, the operating arm 53 and the driven arm 50 try to swing so that their tips approach each other, but the direction of the swing is changed due to a change in the direction of the moment based on the elastic force. Switch. That is, this switching is performed by swinging the operating arm 53 about the left and right horizontal axis center R, and the tips of the swing arm 53 and the driven arm 50 swing to the left in the state shown in FIG. However, in the state shown in FIG. 5, it is swung to the right in the figure.

In the state shown in FIG. 4, the second left and right horizontal shaft 40 is rotated by the swinging operation of the driven arm 50 to the left in the figure, and the rake member 39 rotated along with this rotation is moved by the spring 56 to the tilling section. It is biased to swing in 22 directions. This rake member 39 approaches the tilling section 22 until it comes into contact with the rear end edge of the earth-prevention cover 45 and is restricted from swinging, thus becoming in a state suitable for reverse tilling. At this time, since the soil protection cover 45 also serves as a swing regulating section, a separate component for regulating the swing is required.

In addition, in the state shown in FIG. 5, the second left and right horizontal shaft 40 is rotated by the swinging operation of the driven arm 50 to the right in the figure, and the rake member 39 rotated along with this rotation is moved by the spring 56. The rear cover 32 is biased to swing in the direction. This rake member 39 comes into contact with the front surface of the rear cover 32 via the elastic body 44 and moves away from the tilling section 22 until its swinging is restricted, and is in a state suitable for forward rotation tillage. During normal tilling, when the rake member 39 swings following the swing of the rear cover 32, the rear cover 32 and the rake member 39 come into contact because their respective horizontal axes centers P and Q are eccentric. The positions change, and the rear cover 32 and the rake member 39 move relative to each other in opposite directions perpendicular to their swing axes, and the soil stuck between the rear cover 32 and the rake member 39 is removed by scraping it off. can. In addition, the rear cover 3 when plowing in forward rotation is
2 and the rake member 39 is the rake member 39
By restricting the swing of the rear cover 32, it can be made as small as possible and less likely to become clogged with soil.

In FIGS. 1, 2, and 3, 59 is a rake holder, and in the embodiment shown in FIGS. 1 and 3, a receiver 60 and a support rod 61 are formed in an L shape.
With the receiver 60 inside the rear cover 32 (rake side), the support rod 61 penetrates the rear cover 32 and protrudes, and the support rod 61 has an operating lever 63 which also serves as a display lever via a double nut 62. A nut 64 is screwed into the threaded portion.

That is, the receiver 60 and the operating lever 63 face the same direction, and in the posture A shown in FIG.
0 is along the length direction of the rake, and the posture can be freely changed from this posture A to the posture B shown in FIG. 3 by rotating the support rod 61 around the axis. It is held in place.

The receiver 60 has a length sufficient to receive a plurality of rakes when in posture B.

That is, by aligning the rake member 39 with the rear cover 32 and placing the receiver 60 in posture B, the rake member 39 is held in a direction perpendicular to the rake length direction to prevent it from falling off.

In the embodiment shown in FIG. 2, the receiver 60 and the support rod 61 are T-shaped, and a channel-shaped bracket 65 is fixed to the rear cover 32, and the support rod 61 is inserted into and supported by the bracket 65 so as to be slidable in the longitudinal direction of the rod. Moreover, the receiver 60 is biased by the coil spring 66 so as to come into close contact with the inner surface of the rear cover 32.

The strength of the biasing force can be adjusted freely by the spring receiver 67 and the pin 68, and the other aspects are the same as in FIGS. 1 and 3.

Therefore, in the example shown in FIG. 2, the lever 63
By pressing down against the spring 66 and rotating the receiver 60 around the support rod 61, the posture can be changed between postures A and B.

Here, in any embodiment, the receiver 60
is on the inner surface of the rear cover 32, this receiver 6
Since the orientation of the lever 63 is the same as that of the lever 63, the change in the postures A and B can be confirmed visually from the outside by the rake 63.

In this embodiment, the holders 59 are provided on the left and right sides as shown in FIG. 8, but the number of holders 59 is arbitrary.

Further, when the rear cover 32 is configured with a fixed cover 32A and a slide cover 32B as shown in FIGS. 1 and 2, a holder 59 is fixed to the slide cover 32B side, and a window 69 corresponding to the sliding amount is attached to the fixed cover 32A. is formed.

Of course, the rear cover 32 may be of a non-sliding type.

(Effect of the invention) The present invention includes a main cover 31 that covers the upper part of the tilling section 22 that can be forward and reverse, a rear cover 32 that covers the rear of the tilling section 22 and is swingable about the left and right horizontal axes.
Comb-shaped rake members 19 are located between the tilling section 22 and the rear cover 32, are swingable about the left and right horizontal axes, and are arranged in rows at intervals in the tilling width direction.
A rake holder 59 that holds the rake member 39 is composed of a receiver 60 and a support rod 61, and the receiver 60
is provided inside the rear cover 32 and is provided inside the rear cover 32 so that the posture can be freely changed between a posture A along the longitudinal direction of the rake and a posture B crossing the longitudinal direction of the rake.
1 protrudes through the rear cover 32, and the receiver 60 has a length to receive a plurality of rake members 39, so there are the following advantages.

For example, when the rake member 39 is not required, such as during forward rotation (down cut), it is placed along the rear cover 32 and the rake holder 5
By rotating the receiver 60 of 9 from the posture A to the posture B around the support rod 61, the receiver 60 can reliably prevent the rake member 39 from falling off.

Further, since the receiver 60 is placed along the longitudinal direction of the rake during reverse rotation (downcut), there is less soil adhesion and resistance obstruction, and therefore, power loss can be reduced.

Further, since the support rod 61 protrudes from the rear cover 32, the posture of the receiver 60 can be easily and reliably changed from outside the cover with a single touch.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; Fig. 1 is a side sectional view of the main part of the first embodiment, Fig. 2 is a sectional view of the second embodiment, and Fig. 3 is a perspective view of the main part of the first embodiment. Figure, 4th
The figure is a side view when the rake member is in use (up cut), Figure 5 is a side view when it is down cut, Figure 6 is a sectional view of the rake member switching operation means,
Fig. 7 is an overall side view of the power tiller according to the present invention, Fig. 8 is a plan view thereof, Fig. 9 is a side sectional view of a comparative example, and Fig. 10 is a side sectional view of a comparative example.
The figure is a sectional view taken along the line CC in FIG. 22... Cultivating section, 31... Main cover, 32...
Rear cover, 39... rake member, 59... rake holder, 60... receiver, 61... support rod.

Claims (1)

[Claims for Utility Model Registration] A main cover 31 that covers the upper part of the tilling section 22 which can be forward and reversed; a rear cover 32 that covers the rear of the tilling section 22 and is swingable about the left and right horizontal axis; and the tilling section 2.
Comb-shaped rake members 19 are located between the rear cover 32 and the rear cover 32, are swingable about the left and right horizontal axes, and are arranged in rows at intervals in the tilling width direction. A rake holder 59 that holds the rake member 39 includes a receiver 60 and a support rod 61.
is provided inside the rear cover 32 and is provided inside the rear cover 32 so that the posture can be freely changed between a posture A along the longitudinal direction of the rake and a posture B crossing the longitudinal direction of the rake.
1 protrudes through a rear cover 32, and the receiver 60 has a length to receive a plurality of rake members 39.