JPH11243703A - Rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems in a conventional rotary tiller, of a rear cover which requires reinforcement or weighting to face to a pushing up force of a field because the rear cover is required to become a nearly perpendicular posture and carry out the tilling operation in a locked state on a rotary cover to carry out a soil-moving operation or the like at the neighbor of a levee, and further which is locked only at the lowest position. SOLUTION: A slide bracket 10 pivotally supporting a base terminal of a rotary cover-operating lever is attached to an attaching stay 11 fixed to the upper terminal of the rotary cover 1 so as to be freely slide in front and rear direction, and both members 10 and 11 are connected with a spring 17 so as to urge the slide bracket 10 rearward. A fixing part is installed in right and left each hanger rod 20 protruding from a rear cover 2 so as to be checked by lock arms, and the changing operation of both the right and left lock arms is enabled to be carried out by one lock lever.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for adjusting the vertical position of a rear cover of a rotary tiller.

[0002]

2. Description of the Related Art Conventionally, in a rotary cultivator, a front end of a rear cover is attached to a rear end of a rotary cover for covering a tilling claw so as to be able to swing up and down. The rotary cover is rotated back and forth with respect to the tilling claw drive unit (bevel gear mechanism or chain transmission mechanism that transmits the driving force from the input shaft linked to the PTO shaft to the tilling claw shaft) so that the ground contact section at the lower end of the rear cover abuts on the surface. 2. Description of the Related Art A structure is known in which a movable operation rod is provided between a rotary cover and a tilling claw drive unit so as to be movable, and a longitudinal rotation position of a rotary cover can be adjusted by the amount of expansion and contraction.

Conventionally, the rear cover has the following structure, and can be vertically swung with respect to the rotary cover according to the unevenness of the field. First, a pair of right and left sliding rods (a hanger rod 2 disclosed in FIG.
0) is protruded, and a stopper for restricting downward sliding and a stopper for restricting upward sliding are provided around the upper and lower ends of each sliding rod, respectively. A portion between the two stoppers slidably penetrates a sliding portion rotatably provided on the rotary cover (a holder shaft 19 of the lower arm 18 disclosed later in FIG. 31 and the like). The rear cover swings up and down with respect to the rotary cover within a range in which a portion between the upper end stopper and the lower end stopper of the left and right sliding rod slides in the sliding portion. That is, when the rotary cover is rotated back and forth when setting the plowing depth, or when the tilling claw moves up and down due to the unevenness of the cultivator during the tilling operation, the ground contact portion at the lower end of the rear cover is moved up and down with respect to the rotary cover while contacting the field scene. You can rock.

Further, in such a mounting structure of the rear cover to the rotary cover, the rear cover is fixed to a lowermost rotation position (lowest position) with respect to the rotary cover for work such as muddy edging on the shore. The structure is known. In other words, when the rear cover is at the lowest position, the head of the sliding rod in the sliding portion is prevented from sliding downward by the stopper near the upper end. In this state, the upper part of the head is covered with the lock member so as to prevent the sliding rod from sliding upward. Each locking member for the left and right sliding rods can be switched between a released state (a state in which the sliding rod can slide upward) and a locked state by one operating lever provided on the upper part of the rotary cover.

[0005]

In the conventional rotary cultivator as described above, the first problem is that, when the rear cover is locked with the rear cover lowered to the lowest position, the rear cover is substantially positioned with respect to the field. Touching vertically,
In this state, if the tillage claw moves up and down due to the unevenness of the tillage,
The load applied from the field to the ground contact portion at the lower end of the rear cover is considerably large, and in order to cope with this, conventionally, the structure of improving the strength of the contact portion and increasing the weight of the rear cover has been adopted. On the other hand, however, this increases the pressing force of the rear cover on the field, and the mud squeezing during the scraping work (the mud is protruding to the left and right of the rear cover) and the painting during the tilling work (when the soil that has been plowed is evenly spread). (Eg, flattened state).

[0006] Conventionally, the rear cover can be locked only at the lowest position by the above-mentioned lock structure. However, besides this, there are cases where it is desired to fix the rear cover at the highest position for exchanging tillage nails or cleaning work, or depending on the work, there is a case where it is desired to fix the rear cover with some gap from the field scene. For each sliding rod, there is a method of locking this to the rotary cover with a pin or the like.However, since attaching and detaching the pin is complicated, it is not necessary to attach and detach the pin. There is a high demand that both sliding rods can be locked at these positions by providing one for each rod, or desirably, by operating a single lever that is used when the lever is at the lowest position. In addition, in any case, a structure in which the arrangement space of these lock means is added to the conventionally attached member and the arrangement space is greatly expanded is not desired, and it is compact and compact.
It is desired to have a structure that can avoid interference with other members and ensure the freedom of disposing other members.

[0007]

The present invention uses the following means in order to solve the above problems. First of all, the rotary cover is rotatable back and forth with respect to the tilling claw drive unit, and is expandable and contractable between the rotary cover and the tilling claw drive unit for adjusting the front and rear rotation position of the rotary cover. In a rotary tiller having a simple operating rod, the rotary cover is slidable forward against an end of the operating rod on the rotary cover side against a rearward biasing force.

Second, a pair of right and left sliding rods for adjusting the vertical inclination of the rear cover with respect to the rotary cover is attached to the rear cover at the rear end of the rotary cover. And at least one fixed portion is formed at an arbitrary position in the middle of each sliding rod, and each sliding rod is slidably penetrated through a pair of left and right rotatable sliding portions provided on the rotary cover. In addition, the fixed portion can be selectively fixed by a rotatable lock member provided near each sliding portion, and the rotation of both the left and right lock members can be operated by operating one operating tool. Construct a rotary tiller.

Third, a front end of a rear cover is attached to the rear end of the rotary cover so as to be vertically swingable, and a pair of right and left sliding rods for adjusting the vertical inclination of the rear cover with respect to the rotary cover is attached to the rear cover. And at least one fixed portion is formed at an arbitrary position in the middle of each sliding rod, and each sliding rod is slidably penetrated through a pair of left and right rotatable sliding portions provided on the rotary cover. And an operating tool for switching between the locked state and the unlocked state of each lock member in the vicinity of each slide part, wherein the fixing part can be selectively fixed by a lock member provided inside each slide part. A rotary cultivator arranged to rotate together with the rotation of the sliding portion is configured.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a rotary tiller of the present invention in a shallow plowing state, FIG. 2 is a side view showing a rotary tiller in a deep plowing state, FIG. 3 is a plan view showing the same rotary tiller, and FIG. FIG. 5 is a plan view, FIG. 6 is a front view, FIG. 7 is a plan view of the slide bracket, FIG. 8 is a side view, FIG. 9 is a front view, FIG.
Is a plan view showing the mounting stay, FIG. 11 is a side view of the same, FIG. 12 is a front view of the same, FIG. 13 is a side view showing a mechanism for fixing the position of the rear cover at a vertical inclination angle, and FIG. 14 is a side view showing a hanger rod. 15 is a plan cross-sectional view, FIG. 16 is a side view showing a lock arm, FIG. 17 is a front view showing a portion of a lock arm insertion groove, FIG. 18 is a side view showing a lock lever operating mechanism, and FIG. 20 is a side view showing a lock lever, FIG. 21 is a plan view showing a lever guide, FIG. 22 is a side view, FIG. 23 is a rear view, FIG. 24 is a front view, and FIG. 25 is a rear cover lock link. FIG. 26 is a side view showing the members, FIG.
7 is a side view showing a lock wire link member, FIG. 28 is a plan view thereof, FIG. 29 is a side view showing another embodiment of a position fixing mechanism for the vertical inclination angle of the rear cover, FIG. 30 is a side sectional view thereof, and FIG. 32 is a plan view of the same, FIG. 33 is a plan view of a stopper, FIG. 34 is a side view of the same, FIG. 35 is a front sectional view of a square holder, FIG.
6 is a side view, FIG. 37 is a plan view showing a lock lever, FIG. 38 is a side view, FIG. 39 is a rear view, FIG. 40 is a view showing a spring, FIG. 41 is a view showing a holder shaft, and FIG. It is a side view which shows another Example of a hanger rod.

The structure of the rotary tiller of the first embodiment shown in FIGS. 1 and 2 will be described. The PTO input gear case 5 shown in FIG.
An input portion is formed, and an input shaft 43 that is connected to a PTO shaft of the tractor via a universal joint protrudes forward. The PTO input gear case 5 has tube frames 5a, 5a on the left and right sides. The chain case 4 shown in FIG. 1 is extended downward at one outer end, and a side plate (not shown) is formed at the other outer end. And the tilling claw shaft 3 in which tilling claws (not shown) are radially mounted between the chain case 4 and the side plate to form a tilling claw driving unit. A transmission shaft 44 for transmitting power to a chain transmission device in the chain case 4 is provided inside the pipe frame 5a on the side where the chain case 4 is attached, and the power of the PTO shaft of the tractor is transmitted to the input shaft 43. The tilling claw shaft 3 is driven through the transmission shaft and the chain transmission device.

Further, at the front end of the PTO input gear case 5, a pair of left and right lower link brackets 5c, 5c for connecting to left and right lower links of the tractor protrude forward. A support base 6 is erected on the upper part of the central part, and an upper arm 7 extending rearward upward is erected on the support base 6, and the upper arm 7
A top link mounting arm 8 for connecting to a top link of the tractor is protruded from the front upper portion of the tractor. In addition,
Depending on the tractor, as shown in FIG. 1, a hitch 45 is attached to the top link of the tractor and the rear ends of the left and right lower links. The hook 45a at the upper end of the hitch 45 is attached to the top link mounting arm 8, and the hooks 45b and 45b at the lower left and right are attached. The lower link brackets 5c are locked to each other.

At the rear end of the PTO input gear case 5, a pair of left and right hinges 5b, 5b is projected rearward as shown in FIG. 3 and the like. The front ends of 39 are pivotally supported so as to be vertically rotatable. Each tail wheel supporting frame 39 is a tube material, and its rear end is open. The left and right tail wheel support frames 39
As shown in FIG. 1 and the like, 39 is integrally connected by a left and right connecting frame 39a near the center in the front and rear direction, and accordingly, is vertically rotated integrally with both hinges 5b. An extendable tail wheel elevating operation rod 41 is pivotably connected between the left and right central portions of the connecting frame 39a and the tip end of the upper arm 7. The tail wheel raising / lowering operation rod 41 is a screw rod. When the tail wheel raising / lowering handle 42 is rotated and operated, it rotates and expands / contracts. Hinge 5 according to the amount of expansion and contraction
The vertical inclination angle of the tail wheel supporting frame 39 with respect to the pivot point b is adjusted, and the tail wheel supporting frames 39 and the tail wheel beam 40 supported at the rear thereof are held substantially horizontally.

A rotary cover 1 is provided so as to cover the tilling claw shaft 3 and the tilling claw projecting therefrom, and the rotary cover 1 is attached to the chain case 4 and the bearing portion of the tilling claw shaft 3 on the side plate on the opposite side. The rotary cover 1 is pivotally movable back and forth, and the rotary cover 1 is rotatable back and forth with respect to the tilling claw drive unit. The front end of the rear cover 2 is pivotally supported at the rear end of the rotary cover 1 so as to be vertically rotatable. ing.

The rear cover 2 is provided with a pair of left and right hanger brackets 2a. On the other hand, a pair of left and right lower arms 18 is fixedly provided on the rotary cover 1, and a holder shaft 19 is provided horizontally inside the tip of each lower arm 18 so as to be rotatable around the axis in the left-right direction. Then, the hanger rod 20 which is a sliding rod for operating the vertical swing of the rear cover 2 with respect to the rotary cover 1 is penetrated in the holder shaft 19 which is a sliding portion of the hanger rod 20 in a diameter direction in a sectional view. The base end of the hanger rod 20 is pivotally supported by the hanger bracket 2a of the rear cover 2 so that a pair of left and right sides is provided between the rotary cover 1 and the rear cover 2. The hanger rods 20 are interposed.

In each hanger rod 20, a lower slide restricting receiver 21 is loosely fitted to a portion above (front of) the holder shaft 19, and a flange-shaped head 20a of the hanger rod 20 and a lower slide are received. A buffer spring 22 as a tension spring is wound around the movement regulating receiver 21. When the hanger rod 20 is slid downward and the lower slide restricting receiver 21 is in contact with the holder shaft 19, the rear cover 2 is at the lowest rotational position (lowest position). When a load that forces the rear cover 2 to rotate downward with respect to the rotary cover 1 is further applied from this state, the lower sliding regulation receiver 21 slides upward against the buffer spring 22, The rear cover 2 is allowed to rotate downward with respect to the rotary cover 1 to absorb a shock. Further, the lower sliding regulation receiver 21 is a resin product, and prevents noise caused by the movement of the spring.

In each hanger rod 20, an upper slide restricting receiver 23 is loosely fitted in a portion below (rear to) the holder shaft 19, and a base of the hanger rod 20 and the upper slide restrictor receiver. A pressure spring 24, which is a tension spring, is wound between the pressure spring 23. Hanger rod 2
0 is slid up, and the upper slide restricting receiver 23 is
9, the rear cover 2 is at the uppermost rotation position (the highest position) with respect to the rotary cover 1, and the rear cover 2 is given a downward biasing force by the biasing force of the pressure spring 24. . From this state, if the rear cover 2
When a load is applied to the rotary cover 1 so as to force the rotary cover 1 to rotate upward,
Slides downward against the pressure spring 24 to allow the rear cover 2 to rotate upward with respect to the rotary cover 1 and absorb the impact.

The hanger rod 20 is provided with two sliding restriction receivers 2.
The portion between 1 and 23 is slidable in the slide hole of the holder shaft 19 which is a sliding portion. Rear cover 2
Swings up and down with respect to the rotary cover 1, the hanger rod 20 slides in the slide hole of the holder shaft 19.
The change in the vertical inclination angle of 0 is allowed by the holder shaft 19 being rotatable.

Then, as shown in FIG. 1, a holder shaft 7a is provided laterally in a portion near the base end of the upper arm 7 in the left-right direction.
One of the left and right sides is projected outward, and a holder 7b
The rotary shaft 9a of the rotary cover operating rod 9 is slidably and vertically swingably held by the holder 7b. The rotary cover operating rod 9 is a screw rod (rotating screw), the upper part of which is a rotating shaft part 9a, the lower part of which is a telescopic part 9b, which projects the rotating shaft part 9a forward and upward. A handle 9c is attached to the tip of the handle 9c, and the turning shaft 9a is turned by turning the handle 9c.
The telescopic part 9b, which is a screw rod, expands and contracts. The base end of the rotary cover operating rod 9 is pivotally connected to a slide bracket 10 provided on the rotary cover 1, and the rotary cover 1 rotates forward and backward according to the amount of expansion and contraction of the rotary cover operating rod 9. When setting the tillage depth, the rotary cover 1 is extended and retracted by operating the rotary cover operating rod 9.
Is rotated back and forth, and the rear end of the rear cover 2 disposed at the rear is adjusted to the height in contact with the field scene.

The mounting structure of the slide bracket 10 to the rotary cover 1 will be described with reference to FIGS. The slide bracket 10 has a U-shape when viewed from the front, and a sliding surface 10a on the bottom surface thereof has a front-rear guide hole 1.
0b and 10c are formed before and after. On the other hand, the mounting stay 11 is fastened directly to the upper end surface of the rotary cover 1 on both left and right sides with bolts 14, 14... The guide hole 11b and the guide notch 11c are formed in front and rear. The two sliding surfaces 10a and 11a are in contact with each other, the upper guide plate 12 is in contact with the upper surface of the sliding surface 10a, and the lower guide plate 13 is in contact with the lower surface of the sliding surface 11a.
3 sandwiches both sliding surfaces 10a and 11a. The two guide plates 12 and 13 have pin holes 12a and 12b and 13a, respectively.
13b is drilled forward and backward, from above the upper guide plate 12, a pin hole 12a, a guide hole 10b, and a guide hole 11b.
The pin hole 13a, the pin hole 12b, and the guide hole 10
The guide pin 15 is inserted into each of the c, the guide notch 11c, and the pin hole 13b, and the nut 16 is screwed into a portion of each guide pin projecting downward from the pin hole 13a, 13b. The fastening force of the nut 16 does not hinder the sliding of the sliding surfaces 10a and 11a. With the above-described configuration, the slide bracket 10 is provided with the guide holes 10b and 1
1b and the mounting stay 11 within a range in which the pin 15 slides within a range of front and rear lengths of the guide hole 10c and the guide notch 11c.
Slidable back and forth.

On the other hand, at the rear end of the slide bracket 10, a pair of left and right spring receiving portions 10d is provided.
A pair of left and right spring receiving portions 11d, 11d
The spring receiving portions 10d on the same side are formed respectively.
Tension springs 17 are respectively stretched between 11d to urge the slide bracket 10 and the mounting stay 11 in directions opposite to each other. At the rear end of the slide bracket 10 just in front of the spring receiving portions 10d, 10d, pivot supporting holes 10e for pivotally supporting the base end of the rotary cover operating rod 9 are formed.

The position of the slide bracket 10 is determined by the amount of expansion and contraction of the rotary cover operating rod 9 and the vertical inclination angle, and the position of the mounting stay 11 is determined by the front and rear rotation position of the rotary cover 1. That is, the relative position of the slide bracket 10 with respect to the mounting stay 11 is determined in accordance with the position adjustment of the rotary cover 1 accompanying the setting of the plowing depth. For example, in the deep tilling state shown in FIG. 1, the rotary cover 1 is rotated forward, the rotary cover operating rod 9 is extended, and the slide bracket 10 is slid most rearward with respect to the mounting stay 11. It has become.
Further, in the shallow tillage state shown in FIG. 2, the contraction of the rotary cover operating rod 9 and the backward rotation of the rotary cover 1 cause
The slide bracket 10 is at a position where the slide bracket 10 has been slid most forward with respect to the mounting stay 11.

When the tilling claw is lowered in the recess of the cultivator during the tilling operation, a pushing force from the field scene is applied to the lower end of the rear cover 2, but in the deep tilling state shown in FIG. 1, the rear cover 2 is inclined forward and upward. The hanger rod 20 is a spring 2
1 slides upward against the downward biasing force of
There is room for the lower end of the arm to rotate upward and escape. However, in the shallow plowing state shown in FIG. 2, the rear cover 2 is in a state substantially perpendicular to the field, and a thrust load from the field is applied substantially vertically upward to the lower end of the rear cover 2 abutting on the field scene. . Therefore, there is no room for the rear cover 2 to rotate with respect to the rotary cover 1 by sliding the hanger rod 20 upward. Even more so if the rear cover 2 is locked in this state as described later. However, in the case of the first embodiment of the present invention, while the slide bracket 10 is fixed in position by the rotary cover operating rod 9,
The mounting stay 11 can slide forward against the tension spring 17, and accordingly, the rotary cover 1 is rotated forward, and the rear cover 2 together with the rotary cover 1 is pulled upward to push up from the field. The load can be released.

Next, a second embodiment in which the rear cover 2 can be fixed to the rotary cover 1 in a plurality of steps will be described with reference to FIGS. As described in the first embodiment, the hanger rod 20 is provided with a sliding hole of the holder shaft 19 between the two sliding positions of the lower sliding restricting receiver 21 and the upper sliding restricting receiver 23 provided around the hanger rod 20. This is the part that slides inside. As shown in FIGS. 14 and 15, in this sliding portion, chamfered fixing portions 20b and 20c are formed.

On the other hand, a lock arm 25 is provided around each holder shaft 19 at the end of each of the left and right lower arms 18 so that the holder arm 19 can be rotated back and forth with the holder shaft 19 as a pivot. As the hanger rod 20 swings up and down with respect to the rotary cover 1 with respect to the rear cover 2, the up-down inclination angle changes as the hanger rod 20 slides up and down (the holder shaft 19 rotates following this). Therefore, at any sliding position of the hanger rod 20, the lock arm 25 is rotated in accordance with the inclination angle of the hanger rod 20 at that time, and if the hanger rod 20 is locked, the rear cover 2 can be locked at that position. is there.

FIG. 1 shows the structure of the lock arm 25.
6 and FIG. The lock arm 25 is bent in a substantially L shape in side view, and the holder shaft 1 is bent at the bent portion.
Nine insertion holes 25a are formed, and one side of the insertion holes 25a is a first lock portion 25b, and the other side is a second lock portion 25c. The first lock portion 25b slides the head 2a of the rear cover 2 upward when the hanger rod 20 is at the lowermost sliding position, that is, when the rear cover 2 is rotated to the lowermost position with respect to the rotary cover 1. It deters movement. That is, the rotary cover 1 is pivoted forward, and the rear cover 2 is set at the lowest position, and A in FIG.
When the first lock portion 25b is disposed immediately above the head portion 20a of the hanger rod 20 and the lock arm 25 is fixed, the hanger rod 20 is restricted from sliding upward at the lowest sliding position. The rear cover 2 is locked in a state where the rear cover 2 is substantially perpendicular to the field scene, and muddy work on the shore or the like can be performed.

The second lock portion 25c is provided at the tip of the hanger rod 20 in the middle of the above-mentioned fixing portion 20b or 20.
c is notched up and down, and a mounting portion 25e attached to the lower end of the hanger rod 20 is formed inside the second lock portion 25c from the lower end of the insertion groove 25d. I have. When the rear cover 2 is rotated to the highest position with respect to the rotary cover 1, the fixing portion 20c of the hanger rod 20 is fitted into the fitting groove 25d as shown in FIG. If the lock arm 25 is fixed in this state, the rear cover 2 is locked at the highest position, and the rear of the tilling nail is opened, which is useful for replacement of the tilling nail and cleaning work.

Further, as shown in FIG. 13B, if the lock arm 25 is fixed in a state in which the fixing portion 20b of the hanger rod 20 is inserted into the insertion groove 20d, the rear cover 2 is rotated at the vertical rotation position at that time. Locked to cover 1. For example, when it is not desirable to ground the ground contact portion 2b at the lower end of the rear cover 2 to the field scene, and when performing a tilling operation in which the cultivated lumps are not likely to fly backward, the rear cover 2 is locked in this state. Thus, the lower end of the rear cover 2 is fixed at a position slightly floating from the field scene.

As described above, in the second embodiment, the vertical inclination angle of the rear cover 2 with respect to the rotary cover 1 can be locked in three stages by using the lock arm 25. Further, in the present embodiment, both the left and right lock arms 25.
The switching between the lock position and the release position of the lock lever 25 can be performed by one operating tool, that is, one lock lever 26. The lock lever 26 is disposed inside the upper arm 7, and is almost the same as the position of the lock lever used in the conventional structure that can be locked only when the rear cover 2 is at the lowest position.

The operation mechanism of the lock lever 26 will be described with reference to FIGS. 3, 13, and 18 to 28. A lever guide 27 is provided on one of the left and right sides inside the upper arm 7, and the lock lever 26 is bent in a substantially L-shape when viewed from the front.
The rotation shaft portion 26a is rotatably mounted laterally inside the upper arm 7, and the lever portion 26b is attached to the outer portion of the lever guide 27 so as to be able to rotate back and forth.

A holding portion 27f is formed at the inner end of the lever guide 27 to hold and fix an arbitrary portion at the front end of the upper arm 7, and a horizontal guide plate 27a is formed at the outer portion. And, at the outer end of the guide plate 27a,
Hook portions 27b, 27c, and 27d are formed at three places before and after for locking the lever portion 26b. A leaf spring portion 27e bent in a U-shape in front view is provided between the holding portion 27f and the guide plate portion 27a. Lock lever 2
6 with the hooks 27b, 27c and 27d
When removing from any of the above, the leaf spring portion 27e is narrowed, the guide plate portion 27a is pushed inward, and the rotation of the lever portion 26b is enabled.

The lock shaft 26a of the lock lever 26 is provided with one fixing pin hole 26c in the diametrical direction, and the boss 28a of the rear cover lock link member 28 is arranged around the rotation shaft 26a. At the same time, a pin is inserted by fitting a fixing pin hole 28f formed in the boss portion 28a with the fixing pin hole 26c, and the boss portion 28a is locked and fixed to the rotating shaft portion 26a. In the rear cover lock link member 28, a spring arm portion 28b protrudes from the boss portion 28a in the radial direction, a first spring locking hole 28d is provided at a portion near the distal end, and a first spring locking hole 28d is provided at a portion near the base end. A two-spring engagement hole 28e is provided. The spring arm 28
b, a lock arm 28c for locking a lock wire link member 29 to be described later in a direction orthogonal to the spring arm 28b from the base end of the spring arm 28b. Is bent in an L shape inward.

The lock wire link member 29 has a boss portion 29a loosely fitted to a pivot shaft portion 26a of the lock lever 26 so as to be connected to the boss portion 28a of the rear cover lock link member 28. A link portion 29b extends forward and backward from the boss portion 26a, a spring locking hole 29c is formed at the front end of the link portion 29b, and a wire pivot shaft 29d is protruded at the rear end in the left-right direction. I have.

A first spring 30 is interposed between the lock guide 27 and the first spring locking hole 28d in the spring arm 28b of the rear cover lock link member 28, and the spring arm 28b is rotated backward. It is energizing. On the other hand, the second spring locking hole 28e of the spring arm 28b and the link 29 of the lock wire link member 29
A second spring 31 is interposed between the front end b and the spring locking hole 29b, and the spring arm 28b and the front end of the link 29b are urged in directions opposite to each other. The lock arm 28c is connected to the spring arm 28b.
The rear end of the link portion 29b is urged in a direction opposite to the urging direction of the spring arm portion 28b in accordance with the urging force in the rearward turning direction. ,
The lower end of the lock arm portion 28c is pressed against the rear upper end of the link portion 29b by an opposing biasing force.

Further, the distal ends of two left and right lock wires 32 are pivotally supported on a wire pivot shaft 29d at the rear end of the link portion 29b of the lock wire link member 29, and each lock wire 32 is moved rearward. The other end is extended and is pivotally supported by a wire pivot hole 25f provided on the inner peripheral side of the L-shaped bent portion of each of the left and right lock arms 25 in a side view. Since the rear ends of the link portions 29b are urged in the upward rotation direction, the two lock wires 29 move forward (toward the anti-lock arm 22).
Direction). In addition, L of the lock arm 25
A spring engagement hole 25g is provided on the outer peripheral side of the bent portion, and a tension spring 33 is stretched in front of the spring engagement hole 18a provided on the lower arm 18 to urge the lock arm 25 backward. doing.

The locking operation at each position of the rear cover 2 in the above configuration will be described. First, when the rear cover 2 is set to the lowest position with respect to the rotary cover 1 (when the rotary cover 1 is rotated forward, the rear cover 2 is naturally set to the lowest position), the hanger rod 20 is in a substantially vertical posture. , The lowermost sliding position (the state in which the lower sliding regulating receiver 21 is in contact with the holder shaft 19). In this state, if the lever portion 26b of the lock lever 26 is locked to the first hook portion 27b at the forefront of the lever guide 27, the rotation shaft portion 2 of the lock lever 26
6a, the spring arm 28b and the lock arm 28c of the rear cover lock link member 28 are fixed at the most forward rotation position, and the wire lock is urged against the spring arm 28b and the lock arm 28c. The link portion 29b of the link member 29 has its rear end at the uppermost pivot position, and is fixed with the front ends of the lock wires 32 raised. This forward pulling operation of the lock wire 32 is added against the tension spring 33, and the lock arm 25 is fixed at the foremost rotation position A,
The first lock portion 25b covers just above the head 20a of the hanger rod 20, and the upward rotation of the hanger rod 20 is suppressed. As a result, the rear cover 2 enters a locked state in which upward swing from the lowermost position is suppressed.

Next, when the lever portion 26b is removed from the hook portion 27b and pivots rearward, the rear cover lock link member 28 and the wire lock link member 29 also pivot rearward, and the forward pulling force of the lock wire 32 is reduced. The lock arm 25 is released and rotated rearward by the rearward biasing force of the tension spring 33. Therefore, the head 20a of the hanger rod 20
The first lock portion 25b is removed from above, and the hanger rod 2
9 is free to slide upward, so that the rear cover 2 can swing upward relative to the rotary cover 1.

Further, the lever 26b is connected to the second hook 27
c, the rear cover lock link member 28, which is integral with the lock lever 26, is at the corresponding rotational position, and the wire lock link member 29 follows the link position, and the link portion 29b is at a position where the link portion 29b is horizontal in the front-rear direction. At this position, a forward pulling force is applied to the lock wire 32, and the lock arm 25 is fixed to the intermediate rotation position B shown in FIG. The rear cover 2 is rotated upward with respect to the rotary cover 1 manually or by rotating the rotary cover 1 backward while the ground portion 2b at the lower end of the rear cover 2 is grounded, so that the upper cover can be slid upward. The hanger rod 20 is slid upward (rotated forward), and the fixing portion 20b is inserted into the insertion groove 25d of the second lock portion 25c from above, and locked so as not to slide in the axial direction. When the hanger rod 20 is placed on the placing portion 25e, the lock arm 25 is urged rearward by the tension spring 33, so that the placing portion 2
5e is pressed against the lower end of the hanger rod 20, and the hanger rod 20 is locked to the lock arm 25. Thereby, the rear cover 2 is locked with respect to the rotary cover 1 at the vertical inclination angle in the normal tilling state, for example, when it is desired to avoid the pressing force of the lower end of the rear cover 2 against the ground surface 2a and the cultivation. In the case of tilling work or the like in the case where it is desired to suppress the later mass from flying backward, by setting such a lock state, the lower end of the grounding portion 2a of the rear cover 2 is fixed at a position slightly floating above the surface of the field, and Work can be performed.

In order to release the lock from the state where the lock arm 25 is fixed at the intermediate rotation position B, the second lock portion 25c of the lock arm 25 is rotated downward, and
The fixing portion 20b must be removed from 5d. Therefore, after the lever 26b is detached from the second hook 27c, the lever 26b is rotated forward (closer to the first hook 27b). When the fixing portion 20b comes out of the fitting groove 25d, the lever portion 26b is locked to the first hook portion 27b or the third hook portion 27c, and the first lock portion 25b is also locked when the hanger rod 20 is in the plowed state. When the hanger rod 20 slides freely without being restrained by the two-lock portion 25c, the rear cover with respect to the rotary cover 1 corresponds to the fact that the tilling claw moves up and down due to the unevenness of the tilling during the tilling operation. 2
Can freely swing up and down, so that the lower end of the ground contact portion 2b can always be kept in contact with the field scene.

Further, when the rear cover 2 is to be locked at the highest position for replacement of the tillage nail or cleaning, the lever portion 26b is locked to the third hook portion 27d, and the lock lever 2 is locked.
The rear cover lock link member 28 and the wire lock link member 29 integrated with the lock 6 are moved to the rearmost rotation position, and the rear end of the link portion 29b of the wire lock link member 29 is at the lowest rotation position, so that the lock wire 32 is pulled. The force is released in the vertical sliding area of the hanger rod 20, the lock arm 25 is rotated rearward by the urging force of the tension spring 33, and is fixed at the rearmost rotation position C. When the fixed portion 20c of the hanger rod 20 is inserted and locked in the insertion groove 25d of the second lock portion 25c of the lock arm 25 in this state,
The rear cover 2 is locked at the highest position with respect to the rotary cover 1.

As described above, by operating one lock lever 26, the pair of left and right lock arms 25 can be selectively fixed to the three rotational positions A, B, and C. It can be locked in three vertical rotation angles with respect to 1. It is also possible to release the lock. Although the lock lever 26 is attached to the upper arm 7 in this embodiment, the lock wires 32 are extended further forward, and an operating tool for operating the lock arm 25 is provided near the driver's seat of the tractor. Alternatively, it may be possible to perform the locking operation of the rear cover 2 while sitting in the driver's seat.

Next, in the case where the lock position of the vertical inclination angle of the rear cover 2 with respect to the rotary cover 1 is set in three stages, another embodiment of the lock mechanism is a third embodiment and FIGS. introduce. The lock mechanism of the third embodiment does not lock the left and right hanger rods 20 by one lever operation, but locks them separately at the sliding portions of the left and right hanger rods 20, that is, near the holder shaft 19. It has a structure with a mechanism and a lock lever.

The hanger lot 20 used in the third embodiment
Forms a fixing portion in the same manner as in the second embodiment, except that small-diameter fixing portions 20b 'and 20c' are formed instead of the chamfered fixing portions 20b and 20c.

In the third embodiment, the rear cover 2
Is in the lowermost position, and the conventional lock arm 34 for restraining and locking the head 20a is
It is disposed so as to rotate back and forth with the holder shaft 19 at the rear end as a rotation fulcrum axis. When the rear cover 2 is at the lowest position, the head 20a of the hanger rod 20 is at the lowest sliding position. Upward, the lock portion 34 of the lock arm 34
a to prevent the hanger rod 20 from sliding upward therefrom. When the lock arm 34 is rotated backward, the lock portion 34a is moved to the head 20a of the hanger rod 20.
The hanger rod 20 is pivoted rearward and removed from above, and the hanger rod 20 can be pivoted forward and slid upward.
Switching the two lock arms 34 provided in the vicinity of the holder shaft 19 of the left and right lower arms 18 to the lock position and the unlock position is performed by a conventional single operation provided on the upper arm 7 or provided near the driver's seat. The operation is performed by switching the lever between a lock setting position and a lock release position. The lock arm 34 has a lock wire pivotal support hole 34b at the front end in a side view, and a rear end receiving spring for biasing the rear rotation side. A hole 34c is provided.

In addition to the lock arm 34 for locking at the lowest position, a mechanism for locking the fixing portions 20b 'and 20c' of the hanger rod 20 of this embodiment is provided around each holder shaft 19. I have. First, the holder shaft 19
Is integrally covered with a square holder 35 having a square shape in side view,
Slide holes 35a are formed so as to face the holder holes 19a of the holder shaft 19, and the hanger rod 20 is loosely fitted into the slide holes 29a and the slide holes 35a of the holder shaft 29. Square holder 3
5, a lever stay 35b protrudes from the hanger rod 20 at a lowermost sliding position, that is, a surface located rearward when the hanger rod 20 is substantially vertical. The lock lever 36 is pivotally supported so as to be vertically rotatable. A spring through hole 36a is formed in a contact surface of the lock lever 36 with the lever stay 35b.
An arc-shaped long hole 35c for passing a spring is formed in b.

A stopper 37 is provided in the holder hole 19a of the holder shaft 19, and a hanger rod 20 is provided.
Is loosely fitted in a fitting hole 37a formed in the center of the stopper 37. Further, elongated pin operating holes 35d and 35e are respectively formed on two opposing surfaces of the square holder 35 where the slide holes 35a and 35a are not formed. The operating pins 37b and 37c are provided to protrude, and are inserted into the pin operating holes 35d and 35e, respectively.
7b and 37c are swingable in the longitudinal direction of each of the pin operation holes 35d and 35e.

The tip of the operating pin 37b projecting toward the mounting surface of the lever stay 35b and the spring through hole 3
A spring 38 is interposed between 6a and the long hole 35c. One end of the spring 38 moves in the elongated hole 35c with the vertical rotation of the lock lever 36, and in the process, the dead center is exceeded. That is, when the lock lever 36 is pivoted upward to the release position U, the one end of the spring 38 is
5c, the end of the hanger rod 20 on the head 20a side is fixed by an urging force, the lock lever 36 is fixed at the release position U, and the stopper 37 is connected to the other end of the spring 38. The operation pin 37b to be connected is fixed at the uppermost (frontmost) end position of the front and rear (up and down) swing range, that is, the position closest to the head 20a side of the hanger rod 20, so that the fitting pin 37a is It is fixed to the inserted hanger rod 20 in a state of facing in the radial direction. In this case, the diameter of the fitting hole 37a is the hanger rod 2
0, the hanger rod 20 can freely slide in the fitting hole 37a, and the rear cover 2 can swing vertically with respect to the rotary cover 1.

Then, the hanger rod 20 is slid and the fixing portion 20b 'or 20c' is previously inserted into the fitting hole 37a.
Inside (specifically, slightly below or behind the fitting hole 37a)
When the lock lever 36 is pivoted downward to the lock position L in a state where the lock lever 36 is disposed in the above-mentioned position, the one end of the spring 38 is connected to the end near the base end side of the hanger rod 20 in the elongated hole 35c. It is fixed by the urging force, the lock lever 36 is fixed at the lock position L, and the stopper 37 is fixed in a state where the operating pin 37b connecting the other end of the spring 38 swings toward the base end side of the hanger rod 20. As a result, the hanger rod 20 fitted in the fitting hole 37a is fixed to be inclined with respect to the radial direction. At this time, the fitting hole 3
7a is a hanger rod 2 which is arranged in advance.
Thus, the hanger rod 20 is locked so as not to slide, and the vertical inclination angle of the rear cover 2 with respect to the rotary cover 1 is fixed. Fixing part 20b 'to stopper 37
In this case, it is possible to lock the rear cover 2 with the rear cover 2 slightly raised from the field scene to perform the operation.
When c ′ is locked, the rear cover 2 can be locked in a state where the rear cover 2 is at the highest position, and the tilling claws can be replaced or washed.

In the third embodiment, the left and right hanger rods 2
Although the lock mechanism is configured to lock each of the 0 positions separately, a mechanism for locking at two positions is added in addition to the conventional lock mechanism at the lowest position, but the lock mechanism is around the conventional holder shaft 19. The appearance is such that the lock lever 36 protrudes rearward or upward of the lower arm 18 and hardly changes, does not hinder the vertical swing of the rear cover 2, and impairs the space for disposing other members. It is a compact configuration without any.

[0050]

According to the present invention, the following effects can be obtained by configuring the rotary tiller as described above. First, by configuring as described in claim 1, in particular, when the rear cover is made substantially vertical to the field scene and locked with respect to the rotary cover, the tilling claw descends in the recess of the cultivator and the like. Even when a thrust load from the field is applied to the lower end of the rear cover, the rotary cover slides forward against the end of the operating rod on the rotary cover side against the rearward urging force to release the thrust load. When the thrust load is released, the rotary cover quickly returns to the original position by the rearward biasing force. By doing so, it is not necessary to make the rear cover strong and heavy enough to withstand the thrust load from the field, so that it is possible to reduce the weight and cost, as well as with the increase in the weight of the rear cover. It is possible to eliminate the adverse effects such as smearing and muddying of a cultivated field scene.

Next, with the construction as described in the second and third aspects, the rear cover suppresses the upward sliding of the head of the sliding rod in addition to the conventional locked state at the lowest position. The fixed portion formed at an arbitrary position in the middle of the sliding rod can lock the rotary cover at other vertical inclination angles with respect to the rotary cover. In addition to the muddy work, for example, in a tilling operation in which the rear cover is not in contact with the field scene and the cultivated soil is desired not to fly backward, the rear cover may be swung up and down by the sliding rod. A fixed part is formed in one part of the sliding area for the sliding part corresponding to the area, and this is fixed with a lock member near the sliding part, so that the rear cover is locked at its vertical inclination angle. ,this UNA tillage work is what it is. Also, if the fixing portion is formed to be fixed to the lock member when the sliding rod is at the uppermost sliding position with respect to the sliding portion, the rear cover can be locked at the highest position with respect to the rotary cover, The rear part of the rotary cover is opened so that the tilling nails can be replaced, left and right replacement work, or cleaning work can be performed smoothly.

According to the second aspect of the present invention, the locking and unlocking of the left and right sliding rods to the lock member can be operated by a single operating tool, which facilitates the locking operation. The operation tools are not separately arranged in the vicinity of each sliding rod, the appearance is neat, and the arrangement space in the vicinity of the sliding rod does not change so much, and the rotary cover is not changed. Rotation, swinging of the rear cover, disposition of other members, and the like.

According to the third aspect of the present invention, the operating tools are separately provided for the lock members provided on the left and right sliding rods, respectively, but the lock members are provided inside the respective sliding portions. Therefore, there is no need to increase the arrangement space for the members, and since the operating tools are arranged in the vicinity of each sliding portion, the arrangement space does not increase so much, and it is compact.
Further, since the rotary shaft rotates together with the sliding portion that rotates with the sliding of the sliding rod, it does not interfere with the sliding of the sliding rod, and therefore a wide vertical swing range of the rear cover can be secured.

[Brief description of the drawings]

FIG. 1 is a side view showing a rotary tiller according to the present invention in a shallow tillage state.

FIG. 2 is a side view showing the rotary tiller in the deep plowing state.

FIG. 3 is a plan view showing the rotary tiller.

FIG. 4 is a side view showing a mounting structure of a slide bracket.

FIG. 5 is a plan view of the same.

FIG. 6 is a front view of the same.

FIG. 7 is a plan view showing a slide bracket.

FIG. 8 is a side view of the same.

FIG. 9 is a front view of the same.

FIG. 10 is a plan view showing a mounting stay.

FIG. 11 is a side view of the same.

FIG. 12 is a front view of the same.

FIG. 13 is a side view showing a position fixing mechanism of the vertical inclination angle of the rear cover.

FIG. 14 is a side view showing a hanger rod.

FIG. 15 is a plan sectional view of the same.

FIG. 16 is a side view showing a lock arm.

FIG. 17 is a front view showing a portion of a fitting groove of the lock arm.

FIG. 18 is a side view showing the operation mechanism of the lock lever.

FIG. 19 is a plan view of the same.

FIG. 20 is a side view showing a lock lever.

FIG. 21 is a plan view showing a lever guide.

FIG. 22 is a side view of the same.

FIG. 23 is a rear view of the same.

FIG. 24 is a front view of the same.

FIG. 25 is a side view showing a rear cover lock link member.

FIG. 26 is a plan view of the same.

FIG. 27 is a side view showing a lock wire link member.

FIG. 28 is a plan view of the same.

FIG. 29 is a side view showing another embodiment of the position fixing mechanism for the vertical inclination angle of the rear cover.

FIG. 30 is a side sectional view of the same.

FIG. 31 is a front view of the same.

FIG. 32 is a plan view of the same.

FIG. 33 is a plan view showing a stopper.

FIG. 34 is a side view of the same.

FIG. 35 is a front sectional view showing a square holder.

FIG. 36 is a side view of the same.

FIG. 37 is a plan view showing a lock lever.

FIG. 38 is a side view of the same.

FIG. 39 is a rear view of the same.

FIG. 40 is a view showing a spring.

FIG. 41 is a diagram showing a holder shaft.

FIG. 42 is a side view showing another embodiment of the hanger rod.

[Explanation of symbols]

 Reference Signs List 1 rotary cover 2 rear cover 9 rotary cover operating rod 10 slide bracket 11 mounting stay 17 spring 20 hanger rod (sliding rod) 20b / 20c fixing part 25 lock arm (lock member) 26 lock lever (operating tool) 36 lock lever (operation Tool) 37 Stopper

Claims (3)

[Claims] 1. A rotary cover, which is rotatable back and forth with respect to a tilling claw drive unit, between a rotary cover and the tilling claw drive unit, for adjusting a rotary position of the rotary cover in a front and rear direction. In a rotary cultivator provided with a possible operating rod, the rotary cover is slidable forward against a rear cover side end of the operating rod against a rearward biasing force. . 2. A front end of a rear cover is attached to a rear end of the rotary cover so as to be vertically swingable, and a pair of right and left sliding rods is provided on the rear cover for adjusting a vertical inclination angle of mounting the rear cover to the rotary cover. At least one fixed portion is formed at an arbitrary position in the middle of each sliding rod, and each sliding rod is slidably penetrated through a pair of left and right rotatable sliding portions provided on the rotary cover. The fixing portion can be selectively fixed by a rotatable lock member provided in the vicinity of each sliding portion, and the rotation of both left and right lock members can be operated by operating one operating tool. Rotary tiller featured. 3. A front end of a rear cover is attached to a rear end of the rotary cover so as to be vertically swingable, and the rear cover is provided with a pair of left and right sliding rods for adjusting a vertical inclination angle of mounting the rear cover to the rotary cover. At least one fixed portion is formed at an arbitrary position in the middle of each sliding rod, and each sliding rod is slidably penetrated through a pair of left and right rotatable sliding portions provided on the rotary cover. An operating tool for switching between a locked state and a released state of each lock member is provided near the respective slide part so that the fixed part can be selectively fixed by a lock member provided inside each slide part. A rotary cultivator, wherein the rotary cultivator is arranged so as to rotate with the rotation of a moving part.