JPH08294301A - Tilling device in power tiller - Google Patents

Abstract

PURPOSE: To minimize a shock to an operator and to improve safety of control in backward traveling in turning of a tilling column toward the rear when a power tiller is traveled backward (backward traveling. CONSTITUTION: This tilling device comprises a triangular tilling column in which large area parts 1 of three faces and small area parts 2 of three faces are alternately continued. Corner parts between the small area parts 2 and the large area parts 1 at both sides of the small area parts 2 form forward side small corner parts Cf and backward side large corner parts Cb, respectively. Tilling blades 10 are installed at given intervals around the triangular tilling column A and the tilling blades 10 can be properly protruded in the direction of the tips of the blade and fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention minimizes the impact on workers during the backward traveling of the tiller when the vehicle is traveling backward (reverse traveling), thus ensuring the safety of maneuvering during backward traveling. The present invention relates to a tiller in a tiller that can be improved.

[Prior art]

[0002] Conventionally, tillers mounted on both sides of a drive case of an agricultural power traveling machine such as a tiller and a tractor have been
There are various types such as a round cross section, an octagon cross section, and a hexagon cross section. The round-shaped tiller itself did not have such high tilling performance at the time of tilling, and also became a major factor of increasing the tilling resistance. Also, when the cross section of the tiller is octagonal, hexagonal, etc., the soil can be slightly cultivated in the vicinity of each corner portion, or the tilling resistance can be slightly reduced, but with this, I could not hope for good tilling work. Therefore, the applicant has developed a cultivating tube having a triangular cross section as a solution to the above drawbacks of the conventional cultivating tube.

By the way, this cultivating tube having a triangular cross section is
Tillage resistance can be significantly reduced. Because the cultivator has a triangular cross section, the cross section can be minimized as a square cross section, and the rake angle of the triangular cultivator is the octagonal and hexagonal cross section. This is because it can be much smaller than the soil rake angle. The soil rake angle refers to the angle between the line connecting the center of the triangular tillage tube and the end of the large surface portion and the outer surface line of the cross section of the large surface portion.

Due to this small soil rake angle, the end of the large surface portion (near the corner between the large surface portion and the small surface portion) plays the role of a plowing blade, and it is possible to scoop the soil while throwing the earth mass backward. It was done. Therefore, the conventional type of tillers, such as round ones, had large resistance to compress against soil and large condensing force, which made the tiller resistance large, but the triangular tillers significantly reduced the tiller resistance. Therefore, the forward performance can be improved.

Further, by performing the function of the plowing blade as described above, it was originally necessary to cut the soil, hold the clod, and throw the soil backward only by the plowing blade.
The imaginary circle of the triangular tillage tube has already been cultivated, so that only the outer periphery is cultivated by the cultivating blade, and the cultivating resistance such as the cutting resistance can be remarkably reduced. The plowing work by the triangular plowing cylinder and the plowing work by the plowing blade act synergistically to make the plowing efficiency extremely high. In this way, by using a triangular tillage tube, the drive source can be made small, or even if the soil has viscosity etc., it is possible to efficiently perform the tilling work while reducing the tilling resistance. is there.

As described above, since the triangular cultivator has a role of a plowing blade, the cultivator having the triangular cultivator can be efficiently moved forward without waste. The advantage is that, even when the vehicle is traveling backward, the triangular cultivator obtains the same rotational force as when traveling forward and travels backward as well. This back running is as powerful as moving forward.

[0007]

When the vehicle travels backward by the power of the tiller, the tiller blade may be rotating immediately in front of the operator, and if the operator slips or falls over. Damaged the body with a plowing blade, etc.,
In addition, it is pressed against standing trees, stone walls, banks, pillars in the house, other obstacles, etc. by the cultivator, and when working on the steep slope of the end of the cultivated land, this end falls with the cultivator in the valley. In extreme cases, you may die,
In fact, many fatal accidents have occurred.

Particularly, in the conventional art, as shown in FIG. 29, when the back running is suddenly started, the drive shaft may be low in speed, so that a large reaction force is generated, and in addition to this, the center of gravity is suddenly increased in front of the cultivator. Moves, and the reaction force Q raises the operation handle of the tiller to make it substantially vertical. When the operator feels physically unstable and dangerous, he / she desperately tries to lower the operation handle and grasps the handshake part. Therefore, turning off the clutch and turning off the engine switch means
In reality, it is a difficult matter, and even now, accidents are constant.

As described above, when the cultivator makes a rapid backward movement from the forward or stopped state, the tiller makes a strong movement by kicking the soil, so that an impact is transmitted to the handle operation of the worker during the first backward movement. , Reaction force Q as described above
With, the operating handle of the cultivator is lifted, and the worker momentarily becomes extremely dangerous. This is because, as described above, the tiller rotates strongly while strongly pushing back the soil even when the tiller moves forward even when traveling backward.

As a conventional type of tiller, FIG.
As shown in FIG. 9 (B), there is a type in which the three vertices of a triangular tillage tube are formed as relatively small and flat sides, and the side that comes into contact with the soil when running backward is cut away. This is intended to reduce the resistance from the soil when running backwards, but in reality the notch part becomes sharp, the resistance from the soil becomes large, and the notch part is sharp and It is a very dangerous element.

[0011]

Therefore, as a result of earnest and repeated studies to solve the above problems, the inventor has made the present invention a triangular tillage in which three large surface portions and three small surface portions are alternately continuous. A cultivator in which the corners of the small face portion of the cylinder and the large face portions on both sides of the small face portion are used as the forward small corner portion and the backward large corner portion, respectively, and the cultivating blades are provided around the triangular cultivating cylinder at predetermined intervals. By cultivating equipment in the machine,
This is to solve the above-mentioned problems by increasing the safety of the worker without giving a sharp impact to the worker during the back traveling operation of the tiller and by simplifying the structure of the tiller. .

[0012]

In the triangular tillage tube A, the three large surface portions 1, 1, ... And the three small surface portions 2, 2 ,.
The corner portions formed by the large surface portions 1 and 1 on both sides of the small surface portion 2 are a forward side small corner portion Cf and a backward side large corner portion Cb, respectively. When the cultivator equipped with the cultivating blades 10, 10, ... Is provided around the triangular cultivating cylinder A at a predetermined interval, the cultivator performs backward traveling on the soil from the forward or stopped state, and FIGS. As shown, in the triangular cultivator A, the reverse side large corner portion Cb always bites into the soil ahead of the forward side small corner portion Cf (however, the forward side small corner portion Cf is soiled at the moment when moving from forward to back traveling and when stopped). Except if you are cutting into).

As described above, in the triangular cultivator A, the large rearward-side corner portion Cb always bites into the soil ahead of the forward-side small corner portion Cf when the vehicle is traveling backward, but the rearward-side large corner portion Cb does not move forward. Since it is formed larger than the corner portion Cf, as shown in FIG. 11, the biting angle with respect to the average horizontal surface of the soil becomes extremely small, and the kicking force of the soil at the large reverse-side corner portion Cb becomes extremely small. Therefore, as shown in FIG. 12, as the soil soil flows under the large rearward-side large corner portion Cb, it slips into the soil, and the triangular tillage tube A itself is in a slip state with respect to the soil. The safety can be improved without giving a big impact to the operator who operates the machine.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIGS. 1 and 2, the triangular cultivator barrel A has a substantially triangular cross section, and the three major surfaces constituting the triangular cross section are large surface portions 1, 1, .... And
At the corners of the adjacent large surface parts 1, 1, ...
2, ... are formed respectively. The large surface 1,1,
2, may have a substantially flat shape as shown in FIG. 2 or may have a convex shape and a slightly bulging shape (not shown). It is experimentally preferable that the width of the large surface portions 1, 1, ... Is about 3 times or more the width of the small surface portions 2, 2, ... As shown in FIG. It is not limited to.

At both corners formed by the respective small face portions 2 and the large face portions 1 and 1 on both sides of the small face portion 2, the forward advancing direction side of any small face portion 2 is defined as the forward side small corner portion Cf,
The backward traveling direction side is referred to as the backward traveling side large corner portion Cb (see FIG. 3). Here, in the type in which each of the reverse side large corner portion Cb and the forward side small corner portion Cf is angular, the angle θ _b of the reverse side large corner portion Cb is the forward side small side of the triangular tillage tube A in the forward direction rotating side. Corner C
It is formed to be larger than the angle θ _{f of f} . That is, (the angle θ _{b of the} reverse-side large corner Cb)> (the angle of the forward-side small corner Cf θ _f ).

Next, when adapting each the concept of rake angle in place of the reverse side the large corner Cb and the forward side small corner Cf, rake angle in the reverse side the large corner Cb First is the angle alpha _b, also forward If the rake angle at the side small corner portion Cf is an angle α _f , (rake angle α _b )
> (Rake angle α _f ) (see FIGS. 3 and 4). That is, the rake angle α _{b of} the rearward-side large corner portion Cb is larger than the rake angle α _f of the forward-side corner portion Cf, and therefore the resistance received from the soil mass is reduced. Here, the rake angle means an angle between a line connecting the rotation center O _p of the triangular cultivator A and the end of the large surface portion 1 and the outer surface line of the cross section of the large surface portion 1. That is, as the rake angle becomes smaller, the horizontal component force F _h when kicking the soil becomes larger, and similarly, the resistance received from the soil becomes larger.

As for the type of surface shape of the small face portion 2, it is formed so as to be linearly inclined from the large corner portion Cb on the reverse side toward the small corner portion Cf on the advance side, or bulged in a flat mountain shape. (See Figure 5). Further, there is an embodiment in which the rearward-side large corner portion Cb is formed as an arc-shaped corner surface r so as to bulge outward in a substantially arc-shape. In the arc-shaped corner surface r, the small surface portion 2 and the large surface portion 1 change gently at the reverse side large corner portion Cb, that is, the angle θ _b becomes approximately 180 °, and the cultivator At the time of the initial movement of the back running, the triangular tillage tube A is extremely resistant to the resistance from the soil, and the arc-shaped corner surface r of the triangular tilling tube A makes it easy to slip, which softens the shock at the initial movement of the backward running. In the type to which the arc-shaped corner surface r is applied, the facet portion 2 may be inclined (see FIG. 6) or horizontal (see FIG. 7).

The state in which the triangular tiller A travels back on the soil is shown in FIGS. 8 to 10. That is, the rearward-side large corner portion Cb bites into the surface layer of the soil, and the triangular cultivator A rotates backward. However, the rearward-side large corner portion Cb has a rake angle α _f of By making it larger than the rake angle α _f of the corner Cf, even if the large reverse-side corner Cb bites into the soil, the angle of the soil with respect to the horizontal plane becomes small.

Therefore, as shown in FIG. 11, the horizontal component force F _{h of the} force by which the triangular tiller A kicks the soil during backward traveling is also relatively small, and therefore the resistance from the soil can be extremely reduced. Then, as shown in FIG. 12, the soil moves as if it flows under the large rearward-side corner portion Cb of the triangular cultivating cylinder A, and the triangular cultivating cylinder A temporarily becomes a slip state at the time of the initial back running. Therefore, when the cultivator travels backward, the reaction force received from the soil can be weakened, and the impact caused thereby can be made extremely small, so that the safety of the worker operating the cultivator at the time of the initial movement in the backward travel can be improved.

On the other hand, when the tiller moves forward, the rake angle α _f of the forward-side corner Cf is smaller than the rake angle α _{b of the} reverse-side large corner Cb, so that the forward-side small corner is small. The angle formed by the part Cf and the average horizontal plane of the soil becomes large, and therefore the horizontal component force F _h when kicking the soil also becomes large, and the forward side small corner part Cf can strongly move backward as if it kicks the soil strongly. (Figs. 13 and 14
reference).

In the central portion of the triangular tillage tube A, as shown in FIG.
As shown in FIG. 2, the rotary shaft portion 9 is provided in a penetrating manner. An input through hole 9a is formed in the rotary shaft portion 9, and the traveling drive shaft 1 protruding from the chain case 12 of the cultivator
3 can be connected and inserted. The input through hole 9a of the rotary shaft portion 9 is adapted to the cross-sectional shape of the drive shaft 13 for traveling, specifically, a polygonal type such as a hexagonal shape (see FIGS. 1 and 2 etc.). ), Or a spline shape. FIG. 26 shows a state in which the triangular cultivating cylinder A of the present invention is mounted on the traveling drive shaft 13 of the cultivator.

Next, as shown in FIG. 15, the triangular tillage cylinder A is provided with tilling blades 10, 10, ... The cultivating blades 10, 10, ... Are triangular cultivating cylinders A.
Are mounted on a plurality of holders A ₁ , A ₁ , ... One cultivating blade 10 is attached to one holder A ₁ , and the cultivating blade 10 is protruded by an appropriate amount to the outside of the triangular cultivating cylinder A and can be fixed (see FIG. 16). In order to allow the plowing blade 10 to project from the triangular plowing cylinder A and to be fixed appropriately, it is possible to prevent a decrease in plowing work efficiency due to wear of the plowing blade 10 and to appropriately adjust the plowing depth. It is in. FIG. 25 shows wear of the plowing blade 10, (A) shows a worn state when the plowing blade 10 is viewed in plan, and (B) shows a view of the plowing blade 10 from the P ₂ -P ₂ arrow direction. FIG.

The holder A ₁ is composed of a plowing blade support plate 5 made of a relatively thick metal plate and an attachment portion 6 formed on the plowing blade support plate 5. The mounting portion 6 of the holder A ₁ has a through-hole shape, and is used to fix the plowing blade 10 to the plowing blade support plate 5 via fasteners 11 such as bolts and nuts. There are various embodiments of the mounting portion 6 of the holder A _1. As the first embodiment, as shown in FIG. 17, a plurality of diamond-shaped through holes 6a, 6a, ...
Are continuously formed. Further, specifically, the diamond-shaped through-holes 6a, 6a, ... Are continuously formed so that the adjacent diamond-shaped through-holes 6a, 6a ,.

Fastener 11 used in the above embodiment
As shown in FIG. 17, the types of bolts 11a are
An approximately cubic prismatic base portion 11a ₁ is formed at the base of the screw portion, and the rectangular base portion 11a _{1 has} the same cross-sectional shape as the diamond-shaped through hole 6a and is slightly smaller than the diamond-shaped through hole 6a. The rectangular base 11a ₁ can be inserted into the diamond-shaped through hole 6a. And holder A ₁
When attaching the tilling blade 10 to the bolt 11, the bolt 11a is prevented from idling during the tightening operation of the nut 11b.

As described above, the mounting portion 6 of the first embodiment is formed by continuously forming a plurality of diamond-shaped through holes 6a, 6a, ... The rectangular base portion 11a ₁ is inserted into only one of the shape through holes 6a, 6a, .... And
The square base portion 11 of the bolt 11a is provided in an appropriate diamond-shaped through hole 6a.
By inserting a ₁ , the amount of protrusion of the tilling blade 10 from the triangular tillage cylinder A can be adjusted stepwise. Then, FIG. 18 (A) shows the bolt 1 so that the protruding amount of the cultivating blade 10 becomes the smallest with respect to the triangular cultivating cylinder A.
It shows a state in which the rectangular base portion 11a _{1 of} 1a is inserted into the diamond-shaped through hole 6a. In addition, FIG. 18C shows a triangular cultivating tube A.
On the other hand, the state is shown in which the rectangular base portion 11a ₁ of the bolt 11a is inserted into the diamond-shaped through hole 6a so that the protruding amount of the tilling blade 10 is maximized. Further, FIG. 18B shows a state of being located between the minimum protrusion amount and the maximum protrusion amount.

The cultivating blade support plate 5 of the holder A ₁ is
It is preferable that the mounting portion 6 is formed at two locations for the stability of the plowing blade 10 after mounting. Alternatively, as shown in FIG. 23, when only one mounting portion 6 is formed on the cultivating blade support plate 5, the auxiliary supporting portion 7 should be formed along the upper edge of the cultivating blade support plate 5. There is also. Then, the upper edge of the blade edge 10a of the tilling blade 10 that comes into contact with the tilling blade supporting plate 5 is surrounded by a predetermined range (see FIG. 24).
Then, the plowing blade 10 is fixed to the holder A ₁ by the mounting portion 6 at only one place, and the auxiliary supporting portion 7 presses the upper end edge of the blade portion 10b to prevent the plowing blade 10 from swinging. You can

Next, as a second embodiment of the mounting portion 6, a circular through hole 6b is formed as shown in FIG.
At least two circular through holes 6b are formed in one mounting portion 6, and the amount of protrusion of the cultivating blade 10 from the triangular cultivating cylinder A can be adjusted stepwise. Further, the circular through hole 6b is formed in the bolt 11 of the fastener 11.
A through hole having a play larger than the screw diameter of a (dumb hole), the screw portion of the bolt 11a moves in the circular through hole 6b, and the mounting range of the plowing blade 10 can be finely adjusted. In some cases (see FIG. 20).

As a modification of the mounting portion 6 of the second embodiment, there is an embodiment in which the mounting portion 6 is formed as a long hole 6c as shown in FIG. In this embodiment, the projecting amount of the tilling blade 10 can be adjusted steplessly by the elongated hole 6c. In addition, as shown in FIG. 22, there is also a type in which one of the two elongated holes 6c, 6c is larger than the other and has a play. This is a structure that enables fine adjustment in the vertical direction orthogonal to the protruding direction of the tilling blade 10.

Next, the plowing blade 10 has a blade base 10a and a blade portion 1
0b, and as shown in FIGS. 1 and 16 etc., the blade portion 10b is curved in a substantially J-shape when viewed two-dimensionally, and its tip is gently twisted. A plurality of fixing through holes 10c, 10c, ... Are formed in the blade base 10a at appropriate intervals along the longitudinal direction.
Two of the fixing through holes 10c, 10c, ... Are often formed. Further, although the fixing through hole 10c is a circular through hole, it may be a long hole type or the like, if necessary.

The blade edge 10a of the tilling blade 10 is brought into contact with the mounting portion 6 forming portion of the holder A ₁ , and the fixing through holes 10c, 10c, ... Formed in the blade edge 10a and the long hole 6a of the mounting portion 6 are formed. , 6a, ..., and the like in position so that the fastener 11
The blade edge 10a of the plowing blade 10 is fixed to the holder A ₁ by the bolt 11a and the nut 11b. Then, by loosening the fixing tool 11, the plowing blade 10 can be slidable with respect to the triangular plowing cylinder A within the allowable range of the mounting portion 6, and the plowing blade 10 is set in a desired state. Then, the fixing tool 11 provided on the triangular cultivating cylinder A is tightened to fix the cultivating blade 10.

Next, the plowing work radius between the plowing blades 10, 10, ... And the triangular plowing cylinder A will be described with reference to FIGS. 15 and 16. First, the plural plowing blades 10, 10 ,. When the state of being fixed in the most retracted state with respect to the tube A is the standard tilling state, the center portion of the triangular tilling tube A at the time of rotation is the rotation center O _p , and the standard tilling work virtual circle C _O. Let the radius be R _O. In addition, 1 plowing blade
Let 0, 10, ... Be the radius R _M of the maximum virtual cultivating work circle C _M in a state in which the triangular cultivating cylinder A is maximally projected and fixed.

Further, the plowing blade 10 has a substantially J-shape when seen in a plan view as described above, and the blade portion 10b is inscribed in the plowing work virtual circle, the tip thereof is bent back and the rotation center O _{p is} again formed. Leaning to the side. The plowing work radius and blade 10
The distance from the tip of b is called the amount of warp. By doing so, as shown in FIG. 16, each plowing blade 10, 1
0, the state ... is the most prominent with respect to warpage amount L _O, and the triangular plow tube A with the blade portion 10b tip of a standard tilling imaginary circle C _O when the most retracted state relative triangular plow cylinder A At this time, the maximum cultivating work virtual circle C _M and the warp amount L _M between the tip of the blade portion 10 b are obtained, and when these are compared, the warp amount L _M > the warp amount L _O. This is a plowing blade 1
By further projecting 0 to the outside of the triangular cultivating cylinder A, the amount of warpage thereof becomes large, and the amount of the soil plowing of the plowing blades 10, 10, ... During the plowing work can be increased.

Further, each plowing blade 10 is provided with wear graduations 10m, 10m, ... For measuring the degree of wear (see the sectional views taken along arrows P ₁ -P _{1 in} FIGS. 2 and 16). The wear scales 10m, 10m, ... Are arranged in a direction orthogonal to the longitudinal direction of the blade portion 10b and may be formed in a stamped shape, or may be marked with a paint agent or the like (not shown). Then, it is possible to visually observe how the cultivating blade 10 is gradually worn by the cultivating work, and when the wear reaches a constant wear scale 10 m, it is used as a guide for projecting the cultivating blade 10 in the longitudinal direction or is replaced. The time can be properly judged.

Each triangular cultivating cylinder A in the present invention has a rotary shaft portion 9, and the rotary shaft portion 9 has an input through hole 9a. The drive shaft 13 for traveling, which projects from the lower part of the chain case 12 of the cultivator, has the input through hole 9a.
It can be inserted into and fixed with a pin or the like. The traveling drive shaft 13 has a polygonal cross section (generally, a hexagonal shape in general) or a spline shaft shape. The input through hole 9a has a shape corresponding to the cross-sectional shape of the traveling drive shaft 13. FIG. 26 shows a state in which the triangular cultivating cylinder A is mounted on the traveling drive shaft 13 of the cultivator. 27 shows a state in which the soil is being cultivated, and the triangular cultivating cylinders A are connected in a plurality of axial directions, and the protrusion amount of the cultivating blades 10, 10, ... Has a flat hole shape in cross section. Further, FIG. 28 is a P ₃ -P ₃ cross-sectional view along a line 27, which shows a state where the coupling by shifting the triangular plow cylinder A in Jikushu direction when connecting the two triangular plow cylinder A, A Is.

[0035]

According to the first aspect of the present invention, the small face portion 2 of the triangular tillage tube A in which the three large face portions 1, 1, ... And the three small face portions 2, 2 ,. The corner portions with the large surface portions 1 and 1 on both sides of the small surface portion 2 are respectively defined as a forward side small corner portion Cf and a backward side large corner portion Cb, and the plowing blades 10, 10 are provided at predetermined intervals around the triangular tillage tube A. By using the cultivating device in the cultivator provided with ...
First, it is possible to improve the safety of the worker at the time of the initial movement of the tiller in the backward traveling, and secondly, it is possible to improve the tilling efficiency when moving forward.

To explain the above effect in detail, the large reverse-side corner Cb formed by the large surface portion 1 adjacent on the rotation side in the reverse direction is:
It is formed to be larger than the small forward corner portion Cf formed by the adjacent large surface portion 1 on the forward rotation side, so that the large backward corner portion Cb when the cultivator is stopped or changed from the forward state to the backward traveling. Will always bite into the soil before the forward small corner Cf. Since the large reverse corner Cb is formed to be larger than the small forward corner Cf, the small forward corner Cf bites into the soil to move forward, and therefore, when traveling backward, Even if the large side corner portion Cb digs into the soil, the angle formed by the average horizontal plane of the soil becomes extremely small.

That is, as shown in FIG. 11, the horizontal component force F _{h by} which the large rearward corner Cb kicks the soil becomes extremely small, or, as shown in FIG. 12, the soil of the soil is of the triangular tiller A. It flows so as to crawl the lower side, and the triangular tiller A is temporarily in a state of idling in the initial motion of the back traveling, and therefore, a large impact is prevented from being given to the operator who operates the tiller. Therefore, it is possible to reduce the risk of the operator's operation. Therefore, the safety of the worker can be improved.

On the other hand, when the vehicle is moving forward, the corner Cf on the advancing side is smaller than the large corner Cb on the advancing side, so that the angle formed between the advancing small corner Cf and the average horizontal plane of the soil becomes large. Therefore, the horizontal component force F _{h at the} time of kicking the soil is also increased, and the forward small corner Cf can strongly move the soil rearward as if it were kicking strongly.

Next, the invention according to claim 2 is the cultivating device according to claim 1, wherein the facet portion 2 is formed so as to bulge into a flat mountain shape along the rotation direction. The angle θ _b of the reverse large corner Cb can be made relatively large as compared with the case where the straight large slope is formed from the side large corner Cb toward the forward small corner Cf. Angle θ of large corner Cb
By increasing _b , it is possible to further reduce the impact given to the operator who operates the steering wheel when the vehicle is initially moving backward.

Next, the invention of claim 3 is the cultivating device according to claim 1, wherein the large reverse corner Cb is a cultivating device having an arcuate corner surface r bulging outward, whereby the large reverse corner is formed. The portion Cb becomes a substantially horizontal shape, and by providing a smooth surface, the large corner portion C on the reverse side can be obtained.
Compared to the one in which b has a corner shape, it is more difficult to bite into the soil, the resistance from the soil during back running is minimized, the slip state of the triangular tiller A is increased, and the initial movement during back running is reduced. The impact given to the operator who operates the handle can be reduced.

Next, the invention of claim 4 is the same as in claim 1, wherein the triangular cultivating cylinder A is provided with a predetermined interval at the cultivating blade 1.
0, 10, ... Are provided, and the plowing blades 10, 10, ... Can be appropriately projected and fixed along the direction of the cutting edge, so as to be a plowing device in a plowing machine. .. can be used for a long period of time, and secondly, the plowing depth can be finely adjusted.

To explain the above effect in detail, in the present invention, the plowing blades 10, 10, ... Are appropriately protruded from a predetermined position in the triangular plowing cylinder A, and the plowing blades 10, 10 ,. Since the structure is such that the plowing blade 10 can be fixed, the plowing blade 10 can be used for a long period of time.
Even if it wears, it can be continuously used in substantially the same manner by protruding it from the triangular tillage tube A and fixing it by the amount of wear.

Thus, in the conventional type, the plowing blade is slightly worn by the plowing work, and even if no other disadvantage is found in the plowing work, the plowing depth is as much as the worn amount. However, it became very uneconomical to replace the plowing blade with a new one.
In the present invention, even when the plowing blade 10 is worn during plowing work, the plowing depth can be sufficiently secured by projecting outwardly from the triangular plowing cylinder A by the amount of wear.
The plowing blade 10 can be used without waste, and the period for exchanging it for a new one can be extended, which is economical.

Further, in the present invention, when the plowing blade 10 is worn, not only is the plunging blade 10 projected outward from the triangular plowing cylinder A to obtain the required plowing depth, but also the plowing blade 10 is Even if it is not worn, the plowing depth can be appropriately finely adjusted by projecting it to the outside of the triangular cultivating cylinder A for use. In the past, it was necessary to replace the plowing blades of different sizes according to the desired plowing depth, but in the present invention, one type of plowing blade 10 is used.
It is the one that can change the plowing depth.

[Brief description of drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a perspective view of the present invention.

[Figure 3] Front view of a triangular tillage cylinder

[Figure 4] Enlarged view of the main parts of the triangular tillage cylinder

FIG. 5 is an enlarged view of an essential part showing the shape of a facet of a triangular tillage tube.

FIG. 6 is an enlarged view of a main part showing a modified row of the shape of the facet of the triangular tillage tube.

FIG. 7 is an enlarged view of an essential part showing a modified row of another shape of the facet of the triangular tillage tube.

FIG. 8 is a schematic view showing a state in which the triangular tillage cylinder starts reverse rotation.

FIG. 9 is a schematic view showing a state in which a large corner portion on the reverse side starts to bite into the soil.

FIG. 10 is a schematic view showing a state where the facet has started to bite into the soil.

FIG. 11 is an enlarged view showing a state in which the large corner portion on the reverse side bites into the soil in the reverse state.

FIG. 12 is an enlarged view showing a state in which soil flows under a large corner portion on the reverse side in a reverse state.

FIG. 13 is an enlarged view showing a state where the small corner portion on the forward side bites into the soil in the forward state.

FIG. 14 is an enlarged view showing a state where the small corner portion on the forward side kicks the soil in the forward state.

FIG. 15 is a front view showing a state in which the plowing blade is most retracted from the triangular tillage cylinder and a state in which the plowing blade is most outwardly projected.

FIG. 16 is an enlarged view showing a state where the tilling blade is most retracted from the holder and a state where it is most outwardly projected.

FIG. 17 is a perspective view of an embodiment in which a mounting portion has a diamond-shaped through hole.

FIG. 18 (A) is a schematic view of a state in which a fastener is provided at the most retracted portion of the mounting portion. (B) is a schematic view of a state in which the fastener is provided at an intermediate portion of the mounting portion. Schematic diagram of the state where a fastener is provided on the outermost part of the mounting part

FIG. 19 is a perspective view of an embodiment in which a mounting portion has a circular through hole.

FIG. 20 is a schematic view when the mounting portion is a circular through hole with a play.

FIG. 21 is a perspective view of an embodiment in which the mounting portion has a long hole.

FIG. 22 is a schematic view when the mounting portion is a long hole with a play.

FIG. 23 is a perspective view of an embodiment in which a holder is provided with an auxiliary support part with one mounting part.

FIG. 24 is a front view of an embodiment in which the holder is provided with an auxiliary support part with one mounting part.

FIG. 25 (A) is a front view of a worn plowing blade. (B) is a sectional view taken along the line P ₂ -P ₂ in (A).

FIG. 26 is a schematic view of an embodiment in which a cultivator is provided with a triangular cultivating cylinder equipped with a cultivating blade.

FIG. 27 is a schematic view showing a state of plowing work.

28 is a cross-sectional view taken along the line P ₃ -P _{3 of} FIG.

FIG. 29 (A) is a schematic view showing an operating state of a conventional technique. (B) is a schematic view of a conventional type tiller.

[Explanation of symbols]

 A ... Triangular tiller 1 ... Large surface 2 ... Small surface Cf ... Small corner portion on forward side Cb ... Large corner portion on reverse side r ... Arced corner surface 10 ... Cultivating blade

Claims (4)

[Claims] 1. A corner portion between a small surface portion of a triangular tillage tube and a large surface portion on both sides of the small surface portion, in which a large surface portion of three surfaces and a small surface portion of three surfaces are alternately continuous, are respectively formed on a forward side small corner portion and a backward side. A cultivating device for a cultivator, which has large corners and is provided with cultivating blades around the triangular cultivating cylinder at predetermined intervals. 2. The cultivating device for a cultivator according to claim 1, wherein the small face portion is formed to bulge into a flat mountain shape along a rotation direction. 3. The cultivating device for a cultivator according to claim 1, wherein the rearward-side large corner portion is an arc-shaped corner surface that bulges outward. 4. The cultivator according to claim 1, wherein the triangular cultivating cylinders are provided with cultivating blades at predetermined intervals, and the cultivating blades can be appropriately projected and fixed along the blade tip direction. Cultivator in Japan.