JP2848765B2 - Plowing depth adjustment handle device of rotary device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tillage depth adjusting handle device of a rotary device connected to a rear portion of a tractor body.

[0002]

2. Description of the Related Art Generally, a working machine such as a rotary device is mounted on a tractor at a rear portion of a vehicle body.
In recent years, those mainly connected via a three-point link mechanism have become mainstream. This three-point link mechanism is actually fair 4-2
No. 9687, a top link and a pair of left and right lower links are pivotally supported on the vehicle body side, and their rear ends are connected by a connecting body to which a working machine is attached. It becomes.

[0003] One end of a lift rod connected to a lift arm operated by a hydraulic device is connected to an intermediate portion of the lower link, and the work machine is raised and lowered by rotating the lift arm. I have. Some of the three-point link mechanisms include a horizontal control mechanism. This horizontal control mechanism is for controlling the posture of the working machine horizontally even when the tractor body leans left and right during work. For example, one or both of the left and right lift rods are replaced with lift cylinders, The work implement is inclined left and right with respect to the tractor body by the expansion and contraction of the tractor body.

Further, the rotary device is provided with a gauge wheel on the rear side for adjusting the plowing depth, and a handle shaft is disposed above the rotary device in a forward and upward inclined manner, and the handle shaft is rotated to operate the gauge wheel. In some cases, the height of the wheel is adjusted, and thus the plowing depth of the rotary device is adjusted. A handle is normally provided at the upper end of the handle shaft orthogonally to the axis to serve as an operation unit for adjusting the plowing depth.

[0005]

By the way, when the above-mentioned rotary device is raised by the three-point link mechanism, the rotary device is tilted so that the upper portion thereof approaches the tractor side. Therefore, the operation unit provided at the upper end of the handle shaft disposed above the rotary device may collide with the glass or the like of the cabin, causing a problem such as breaking the glass.

[0006] In particular, when the lift cylinder is shortened in a device provided with a horizontal control mechanism, the operating portion of the handle is more likely to approach the cabin or the like and easily collide with the glass or the like of the cabin. Therefore, an object of the present invention is to prevent the glass from breaking or the like by retracting the handle when the handle collides with the glass or the like of the cabin.

[0007]

According to the present invention, there is provided a tilling depth adjusting handle device of a rotary device which is connected to a rear portion of a vehicle body via a link mechanism so as to be vertically movable. In order to achieve the above object, the following technical measures were taken to adjust the cultivation depth of the rotary device by rotating the handle shaft arranged in the above.

That is, the tillage depth adjusting handle of the rotary device according to the present invention is pivotally supported on the upper end of the handle shaft so as to be freely changeable between an operation posture orthogonal to the handle shaft and a retracted posture along the handle shaft. It is characterized by comprising a handle, and a holding body for elastically holding the handle in the operating posture.

[0009]

When the rotary device is lifted by the link mechanism and the handle in the operating position comes into contact with the glass of the tractor cabin and a load greater than the holding force of the holding member acts on the handle, the handle is moved to the retracted position. The posture is changed, and a large impact force is prevented from acting on the glass and the like of the tractor cabin, and the glass is prevented from breaking.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment of the present invention shown in FIG. 1, a cabin 3 is mounted on a vehicle body 2 of a tractor 1, and an operation seat 4 is provided in the cabin 3. Cabin 3
A rear glass 5 is provided on a rear surface portion of the rear glass 5. The rear glass 5 has an upper end portion pivotally supported by a column of the cabin 3.
The lower end is openable and closable outward.

A rotary device 7 is connected to a rear portion of the vehicle body 2 of the tractor 1 via a three-point link mechanism 6. The three-point link mechanism 6 includes a top link support 8 fixed to the upper center of the vehicle body 2, a top link 9 pivotally supported by the top link support 8, and a pair of pivots supported on the left and right sides of the lower portion of the vehicle body 2. And the lower link 10 is connected via a lift rod 11 to a lift arm 12 which is rotationally driven by a hydraulic device. In addition, one or both left and right lift rods 1
Instead of 1, a lift cylinder constituting a horizontal control mechanism may be used.

At the rear ends of the top link 8 and the left and right lower links 9, a connection frame 38 having a substantially A-shape in front view is pivotally connected.
The rotary device 13 is detachably attached to the connection frame 38. The rotary device 7 can be moved up and down by the three-point link mechanism 6, and is lowered to a posture 13 (shown by a solid line in FIG. 1) at the time of work. Is set to the raised posture 14 (shown by a two-dot chain line in FIG. 1).

The rotary device 7 includes a rotary machine casing 15.
The rotary tilling part 16 is provided at the lower part of the tractor 1 and the rotary tilling part 16
And is driven by power transmitted to the input shaft of the gear case 19 on the rotary machine frame 15 side via the
In addition, a rotary cover 20 is provided from above the rotary tilling unit 16 to the rear.

At the rear of the rotary base frame 15, a gauge wheel frame 21 is pivotally connected.
An intermediate portion of the rotary shaft 1 and a rear end of the rotary cover 20 are connected via a cover adjusting rod 22, and a pair of left and right gauge wheels 23 are provided at a rear end of the gauge wheel frame 21. A top mast 24 having a substantially U-shape in side view is provided on the upper part of the rotary machine frame 15. The rear upper end of the top mast 24 and the middle part of the gauge wheel frame 21 are provided with a plowing depth adjustment handle. It is connected via a device 25, and the cultivation depth of the rotary device 7 is adjusted by the cultivation depth adjusting handle device 25.

This cultivation depth adjusting handle device 25 is shown in FIGS.
As shown in FIG. 5, a bearing 26 pivotally supported at the rear upper end of the top mast 24 is provided. A thrust ball bearing 27 is provided in the bearing 26, and a handle shaft 28 is supported by the bearing 27 so as to be rotatable. The handle shaft 28 is disposed above the rotary device 7 so as to be inclined forward and upward, a thread groove is threaded on the outer periphery, and the upper end of an inner cylinder 29 pivotally connected to a middle part of the gauge wheel frame 21. Part. Therefore, by rotating the handle shaft 28, the gauge wheel 23 is moved up and down, and thus the plowing depth of the rotary device 7 is adjusted.

An outer cylinder 30 enclosing the handle shaft 28 is fixed to the bearing 26. The inner cylinder 29 is inserted into the outer cylinder 30 slidably in the axial direction. An upper end of the handle shaft 28 is provided with a holding portion 31 having a U-shaped cross section,
An L-shaped handle 32 is pivotally connected to the holding portion 31, and as shown in FIGS. 1 and 2, a retracted posture B along the handle shaft 28 and a direction perpendicular to the handle shaft 28 and extending in a radially outward direction. The posture can be freely changed to the operation posture A.

A holding member 35 made of spring steel is fitted in the holding portion 31. As shown in FIG. 4, the holding body 35 has a distal end slightly smaller than the diameter of the handle 32, and elastically holds the handle 32 in the operating posture A by holding the handle 32 from the left and right sides. The handle 32 is held in a posture. Therefore, when adjusting the plowing depth of the rotary device 7 with the handle device 25, the handle 32 may be held in the operating posture A.

According to the present embodiment, when the rotary device 7 is changed to the raised position 14 by the three-point link mechanism 6, the handle 32 of the tillage depth adjusting handle device 25 collides with the rear glass 5 of the cabin 3 or the like. However, if a load greater than the holding force of the holding body 35 acts, the handle 32 is changed from the operating position A to the retracted position B, so that the rear glass 5 can be prevented from breaking.

When the handle 32 is located above the handle shaft 28 as shown in FIGS. 1 and 2, the handle 32 is likely to collide with the rear glass 5 or the like. Further, in the apparatus provided with the horizontal control mechanism, when the rotary device 7 is set in the rising posture in a state where the lift cylinder is shortened, it is particularly easy to collide with the rear glass 9 or the like. Therefore, in these cases, it is very effective to employ the tillage depth adjusting handle device 25.

In the rotary device 7 of the above embodiment, a mounting portion 20a for a soil cultivator is provided at the left and right central portions of the rotary cover 20, as shown in FIG. The mounting portion 20a is closed by the auxiliary cover 40. This auxiliary cover 40 is shown in FIG.
As shown in the figure, the mounting device 41 is detachably connected to the rotary cover 20. The mounting device 41 includes a mounting plate 42 fixed to the auxiliary cover 40, a U-shaped bracket 43 fixed to the rotary cover 20, and a lock pin 44 penetrating the mounting plate 42 and the U-shaped bracket. I have.

A spring 45 is fitted on the lock pin 44, and the tip of the lock pin 44 is urged in a direction to engage with the mounting plate 42. Further, a lever 45 is pivotally connected to a base end of the lock pin 44 via a pin 48 so that the posture can be freely changed between a lock posture 46 and a release posture 47 rotated 90 ° from the lock posture 46. The contact surface 45b between the lever 45 and the U-shaped bracket 43 in the release posture 47 is longer than the distance L1 between the pin 48 and the contact surface 45a between the lever 45 and the U-shaped bracket 43 in the locked posture 46. And the distance L2 between them is increased, and accordingly, the release posture 4
7, the lock pin 44 is pulled out and the mounting plate 4
2 is released.

That is, the levers 4 of the four mounting devices 41
By simply changing the position of the auxiliary cover 41 to the release position, the auxiliary cover 41 can be removed, and the attaching and detaching work can be performed easily and quickly.
The present invention is not limited to the above embodiments, and can be appropriately designed and changed. For example, the holder 35 may be made of an elastic material such as rubber. Also, handle 32
May be directly connected to the upper end of the handle shaft 28.

In the embodiment of the present invention, the handle 3
Even if 2 collides with glass 5 etc. of cabin 3, handle 32
The handle 32 is retracted, but in order to avoid the collision, it is preferable to hold the handle 32 in a posture in which the handle 32 does not collide in advance. For example, in the embodiment of the present invention shown in FIG. 2 to FIG. What is necessary is just to hold | maintain the attitude | position in the evacuation attitude | position B.

As shown in FIGS. 9 and 10, the handle 32 may be non-rotatably held by the holding bracket 37 in a position positioned below the handle shaft 28. The holding bracket 37 is formed in a substantially U shape by spring steel, and both ends thereof are eccentrically supported on the left and right side surfaces of the bearing 26, and therefore, the holding bracket 37 is orthogonal to the handle shaft 28. Attempt to change the posture so that it is in a posture.

Therefore, when adjusting the cultivation depth, the holding fitting 37 is set in a posture 37a detached from the handle 32, and after the cultivation depth adjustment, the handle 32 is moved to the handle shaft 2.
The handle 32 may be held by rotating the holding bracket 37 toward the handle 32 while positioning the handle 32 below the handle 8.

[0026]

As described above, the tillage depth adjusting handle device of the rotary device according to the present invention can freely change the attitude between the operating position extending radially outward from the handle shaft and the retracted position along the handle shaft. Since it has a handle pivotally supported at the upper end and a holding member for elastically holding the handle in the operating posture, when the rotary device is raised by the link mechanism, the tillage depth adjusting handle device Even if the handle collides with the glass or the like of the cabin, the handle is changed from the operating position to the retracted position, so that breaking of the glass can be prevented. In particular, it is effective to adopt a device having a horizontal control mechanism.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an enlarged side view showing a main part of the embodiment of the present invention.

FIG. 3 is a view taken in the direction of arrow A in FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along line CC of FIG. 2;

FIG. 6 is a plan view of the rotary device.

FIG. 7 is an enlarged partial cross-sectional view showing an auxiliary cover of the rotary cover.

FIG. 8 is a sectional view taken along line DD of FIG. 7;

FIG. 9 is an enlarged side view illustrating an example of a handle posture holding unit.

FIG. 10 is a developed view corresponding to a cross section taken along line EE of FIG. 9;

[Explanation of symbols]

 2 Body 6 Link mechanism 7 Rotary device 25 Tillage depth adjusting handle device 28 Handle shaft 32 Handle 35 Holder A Handle operating posture B Handle retracting posture

──────────────────────────────────────────────────の Continued on the front page (72) Inventor, Shunji Fujimoto 64, Ishizukita-cho, Sakai-shi, Osaka Kubota Sakai Works Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) A01B 63/14- 67/00

Claims (1)

(57) [Claims] 1. A tilling depth adjusting handle device of a rotary device (7), which is connected to a rear portion of a vehicle body (2) via a link mechanism (6) so as to be able to move up and down, wherein the handle is disposed above the rotary device (7). A rotary shaft of a rotary device (7) that is operated by rotating a handle shaft (28) disposed in a forward and upwardly inclined shape, the operating posture (A) extending radially outward from the handle shaft (28). ) And the retracted posture (B) along the handle shaft (28).
A handle (32) pivotally supported on the upper end of the handle shaft (28) so that the posture can be freely changed, and the handle (32).
(3) that elastically holds in the operating posture (A)
5) A tillage depth adjusting handle device of a rotary device, characterized by comprising: