JPH07250504A - Elastically cover-lowering device of rotary tiller - Google Patents

Abstract

PURPOSE:To prevent the accidental upward movement of a rear cover. CONSTITUTION:In the elastically cover-lowering device of a rotary tiller in which a rear cover for covering the upper rear part of the rotary tiller is vertically rotatably and pivotally attached to a fixing side; the rear cover is connected to the fixing side through a rod 11; an elastomer for elastically lowering the near cover is disposed on the rod; a lock device 18 for allowing or restricting the relative movement of the rear cover with the rod in the axial direction is disposed on at least one of the connecting member of the rear cover to the rod and the connecting member of the fixing side to the rod; and an engaging member 19 capable of being detachably engaged with the rod and a position-changing device 20 for changing the position of the engaging member are disposed in the lock device, the position of the engaging member can be changed to either of three positions comprising a position at which the engaging member 19 and the rod 11 are perfectly engaged with each other to prevent their relative movement, a position at which the engaging member and the rod are imperfectly engaged with each other to allow their movement in a direction, and a position at which the engaging member and the rod are separated from each other to allow their relative movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover lowering device for a rotary tiller of an agricultural machine.

[0002]

2. Description of the Related Art As this type of cover lowering device, for example, a device described in Japanese Patent Laid-Open No. 137403/1993 is known. In this conventional type, a rear cover is pivotally attached to the rear end of the upper cover on the upper part of the rotary tillage so that the rear cover can be moved up and down. A cover lowering device for a rotary device, in which a lowering rod pivotally mounted is slidably inserted into a receiving member, and a lowering coil spring is fitted over the lowering rod. A plurality of engaging recesses are provided, and an engaging body that engages with the engaging recess in a disengageable manner and a spring that biases the engaging body in the engaging direction are provided in the receiving member, and the engaging body protrudes from the receiving member. A first cam portion and a second cam portion that pivotally support the engagement / disengagement lever with a pin on the protruding end portion and contact the engagement / disengagement lever on the receiving member side to hold the engagement body at the engagement position and the disengagement position. It was provided by changing the positions of and around the pin.

When the engagement body is held at the engagement position, the rear cover can move upward, but downward movement is restricted, and when the engagement body is held at the disengagement position, the rear cover can move vertically. Was configured to be.

[0004]

When it is desired to dry the soil such as in autumn, the rear cover may be slightly raised to cultivate the soil without leveling it. In such a work, in the above-mentioned conventional work, the cultivating work is performed with the engagement body held at the engagement position. Then, there is a problem that the rear cover gradually moves upward due to the vibration of stones and the like, and the soil scatters violently, so that proper work cannot be performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cover lowering device for a rotary tiller which solves the above problems.

[0006]

In order to achieve the above object, the present invention takes the following means. That is, the feature of the present invention is that the rear cover that covers the upper rear part of the rotary tiller is pivotally attached to the fixed side in a vertically rotatable manner.
The rear cover and the fixed side are connected by a rod, the rod is provided with an elastic body that hangs down the rear cover, and at least one of the connecting portion between the rear cover and the rod or the fixed side and the rod is A lock device for permitting or restraining relative movement in the axial direction with respect to the rod is provided, and the lock device engages with the rod in a disengageable manner, and a position changing device for changing the position of the engaging body. In the cover lowering device of the rotary cultivator provided with the position changing device, the position changing device does not disengage the engaging body and the rod by completely engaging the engaging body and the rod. The position of the engaging body can be changed into three positions, that is, a position where the engaging body is completely engaged to allow movement in one direction and a position where the engaging body and the rod are separated to allow relative movement between the two. .

[0007]

According to the present invention, the rear cover can be held in a locked state in which the movement of the rear cover is completely stopped, in a free state in which the movement of the rear cover is completely free, and in an auto-hanger state in which movement in one direction is allowed. In the fall wake up work as described above, it is used in a locked state. When using automatic plowing work, leave it free. It is used as an auto-hanger when exchanging tillers and checking.

Since the fall raising work is used in the locked state, the rear cover does not inadvertently rise unlike the conventional case.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a cross-sectional view of a rotary cultivator which is detachably attached to the rear part of the tractor, and the rotary cultivator is provided with a gear case (not shown) provided at the center in the left-right direction, A pair of left and right support arms 1 extending from the left and right sides of the gear case, a chain case (not shown) fixed to both outer ends of the support arm 1, a side frame 2, and a chain case and a side frame 2 It has a tillage claw shaft 3 which is erected between the lower parts. A cultivating claw (not shown) is detachably attached to the cultivating claw shaft 3 to form a cultivating part 4.

The rotary cover for covering the cultivating part 4 is composed of an upper cover 5, a rear cover 6, a side cover 7 and the like. The front end of the rear cover 6 is the top cover.
It is pivotally attached to the rear end of 5 so that it can rotate in the vertical direction. A cover lowering device 8 is provided between the upper cover 5 and the rear cover 6.
Is provided. This cover lowering device 8 is a pair of left and right lower brackets provided on the upper surface of the rear cover 6.
9, a rod 11 pivotally attached to the lower bracket 9 via a pin 10, a pair of left and right upper brackets 12 provided on the upper surface of the upper cover 5, and a tip of the upper bracket 12. And a receiving member 13 provided in the section.

The rod 11 is slidably inserted into the receiving member 13. The rod 11 is formed of a hollow pipe, and recesses 14 are formed at a predetermined pitch along the longitudinal direction thereof. The recess 14 is formed as a hole that opens to the side surface of the rod 11. A spring 15, which is an example of an elastic body that hangs down the rear cover 6, is fitted over the rod 11. A stopper 16 for restraining the lower end position of the spring 15 is fitted on the rod 11.

The stopper 16 has a claw 17 which is removably engaged with the recess 14. This stopper 16 has a claw 17
It is movable in the axial direction by releasing the engagement between the concave portion 14 and the concave portion 14, and is fixed at an arbitrary position by engaging the claw 17 and the concave portion 14. A lock device 18 is provided on the receiving member 13. The details are shown in FIGS.

The locking device 18 is a recess of the rod 11.
It has an engaging body 19 which is engaged with the disengageable member 14 and a position changing device 20 which changes the position of the engaging body 19. That is, the engagement body 19 is a head 21 that is removably inserted into the recess 14 of the rod 11 in the radial direction of the rod 11, and a head 21 that extends from the head 21 and is slidably supported by the receiving member 13. And a shank portion 22 that is open. The tip of the head 21 is formed on an inclined surface 23. The diameter of the shank portion 22 is smaller than the diameter of the head portion 21, and the end portion of the shank portion 22 projects outward from the receiving member 13. The compression spring 24 is removed from the shank portion 22, and the engagement body 19
Is urged in the engagement direction with the recess 14.

The position changing device 20 has an operating lever 26 rotatably supported by a pin 25 on a shank portion 22 of an engaging body 19 protruding from the receiving member 13. This operating lever
A first cam portion 27, a second cam portion 28, and a third cam portion 29 are formed at three positions on the outer peripheral surface of the pin 26 around the pin 25. The cam portions 27, 28, 29 are in contact with the end surface of the receiving member 13. When each of the cam portions 27, 28, 29 comes into contact with the end surface of the receiving member 13, the distance between the contact surface and the pin 25 is such that the first cam portion 27 <the second cam portion 28 <the third cam portion. It is said to be 29.

That is, the first cam portion 27 and the receiving member shown in FIG.
In the state where the end of 13 is in contact, the engaging body 19 and the recess 14 of the rod 11 are completely engaged, and relative movement between the rod 11 and the receiving member 13 is prevented (locked state). As shown in FIG. 2, when the second cam portion 28 and the end portion of the receiving member 13 are in contact with each other, the engaging body 19 and the recessed portion 14 are incompletely engaged and the rod
Movement in the direction of the arrow 11 is allowed (auto hanger state). That is, the inclined surface 23 of the head 21 of the engaging body 19 does not enter the recess 14 and allows the rod 11 to move in the arrow direction, but the opposite inclined surface side of the head 21 enters the recess 14 and is opposite to the arrow direction. It prevents movement in the direction.

As shown in FIG. 3, the third cam portion 29 and the receiving member
In the state where the end portion of 13 is in contact with each other, the engagement body 19 and the rod 11 are separated from each other, and relative movement between them is allowed (free state). According to the above-described embodiment, the rear cover 6 can be held in a locked state in which the movement of the rear cover 6 is completely stopped, a free state in which the movement of the rear cover 6 is completely free, and an automatic hanger state in which movement in one direction is allowed.

Therefore, the fall wake-up work is used in a locked state. When using automatic plowing work, leave it free. It is used as an auto-hanger when exchanging tillers and checking. Since the fall raising work is used in the locked state, the rear cover does not inadvertently rise as in the conventional case.

As shown in FIG. 5, a bracket 30 is attached to the outer surface of the lower end of the side frame 2 of the rotary tiller.
Is fixed, and the residual tillage treatment claw 31 is obliquely attached to the bracket 30. By mounting the tillage treatment claws 31 obliquely in this way, the distance between the concrete caulking and the side frame 2 can be increased, and the side frame 2 and the bearing bracket 32 are not damaged.

The present invention is not limited to the above-mentioned embodiment. For example, instead of providing the locking device at the fixed side connecting portion, as described in Japanese Patent Laid-Open No. 5-137403, the rear cover is disclosed. You may provide in the side connection part. Also,
The rod is not limited to a hollow rod, and may be a solid rod, and the recess may be a notched recess.

[0020]

According to the present invention, not only the conventional two-position change but also the three-position change is possible, so that the lock state can be obtained, and therefore, it can be used in the lock state for work such as coming in autumn. It is possible to prevent the rear cover from being inadvertently raised during the operation.

[Brief description of drawings]

FIG. 1 is a sectional view in a locked state showing a main part of an embodiment of the present invention.

FIG. 2 is a sectional view showing an auto-hanger state of the same.

FIG. 3 is a sectional view showing a free state of the same.

FIG. 4 is a cross-sectional view showing the overall configuration of the embodiment of the present invention.

FIG. 5 is a front view showing an attachment structure of a residual tillage treatment claw.

[Explanation of symbols]

 4 Tillage part 6 Rear cover 11 Rod 15 Elastic body 18 Lock device 19 Engagement body 20 Position changing device

Claims (1)

[Claims] 1. A rear cover for covering an upper rear part of a rotary tillage part is pivotally attached to a fixed side in a vertically rotatable manner, and the rear cover and the fixed side are connected by a rod, and the rod is provided with the rear cover. An elastic body that lowers the rod is provided, and at least one of the connecting portion between the rear cover and the rod or the fixed side and the rod is provided with a locking device that allows or restrains the axial relative movement of the rod. In the cover lowering device of the rotary tiller, the locking device is provided with an engaging body that engages with the rod in a disengageable manner, and a position changing device that changes the position of the engaging body. Is a position at which the engaging body and the rod are completely engaged to prevent relative movement therebetween, a position at which the engaging body and the rod are incompletely engaged to allow movement in one direction, and an engaging body. Separate the rod and both Of the three positions of the position for allowing relative movement, the cover bullet under device of the rotary tiller, characterized in that as a repositionable the engagement body.