JPS6137203Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tillage depth adjustment device for a tiller, which is constructed by attaching a side drive type rotary tiller to an agricultural tractor or walk-behind tiller. In other words, the present invention aims to expand the plowing depth adjustment range while using a lifting and lowering operation mechanism for plowing depth adjustment that is small in size, including its operating range, and can be operated with a small operating force. .

In the conventional tillage depth adjustment device for this type of tiller, the grounding sled body and the tillage depth adjustment lifting/lowering operation mechanism were interlocked and connected via a link mechanism, so in order to widen the tillage depth adjustment range, It is necessary to increase the link ratio, and therefore a large operating force is required to adjust the plowing depth, making it difficult to adjust the plowing depth.

In addition, when the link ratio is made small so that the plowing depth can be adjusted with a small operating force, the rocking of the grounding sled body causes changes in the relative posture of the grounding sled body with respect to the lifting operation mechanism. Then, the overall configuration,
Especially since the link mechanism is complicated, it is not possible to expand the plowing depth adjustment range.

The plowing depth adjustment device in the tiller according to the present invention is
A pair of left and right transmission cases 2A that constitute a gate-shaped support frame 2 have been developed in view of this point.
In a side drive type rotary tiller in which the rotary tiller 1 is pivoted between the lower end portions of the transmission case 2A and the side frame 2B,
A pair of left and right grounding sled bodies 3, 3 for adjusting plowing depth are pivoted to the lower end of the side frame 2B so as to be able to swing up and down with rotation centers X, X in the vicinity of the lower end. A screw is provided at the free end of an arm 4A pivotably pivoted to the body part 4 located in the center of the upper spanning support arm part of the support frame 2, and is rotated via a handle 5A to move in the axial direction of the arm 4A. By attaching the shaft 5B, a lifting operation mechanism 5 for adjusting tilling depth is provided, and between the sled bodies 3, 3 and the lifting operation mechanism 5 , the sled bodies 3, 3, respectively. From the free end of the rod 6A,
6A is pivotably connected upward, and swinging arms 6A and 6B are provided corresponding to the rods 6A and 6A, respectively, and swinging arms 6A and 6B are simultaneously swing-operated by the elevating and lowering operation mechanism 5 , and the swinging arms 6B, 6
The adjustment mechanism 6 is configured such that the free end of B and the rods 6A, 6A are attached in the longitudinal direction so that the positions can be changed and fixed, and the plowing depth adjustment range of the left and right sled bodies 3, 3 can be changed in the vertical direction, respectively. 6 is provided.

In other words, even if the adjustment range of the lift operation mechanism alone is configured to be small, by changing the position of this adjustment range in the vertical direction with the left and right adjustment mechanisms, the actual adjustment range can be made very large. This made it possible to reduce the required operating force and simplify and downsize the entire adjustment mechanism. Further, since the elevating operation mechanism for simultaneously raising and lowering the left and right sled bodies is provided at a position above the center of the gate-shaped support frame, adjustment of the elevating operation mechanism can be easily carried out without the risk of being interfered with by other devices or members. It has the advantage of

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a pair of left and right transmission cases 2A and a side frame 2 constitute a gate-shaped support frame 2.
In the tiller, a side-drive type rotary tiller, in which the rotary tiller 1 is mounted on a shaft between the lower ends of the tractor body 7, is attached to the rear of the main tractor 7 so as to be able to swing up and down. A pair of left and right grounding sled bodies 3, 3 for adjusting plowing depth are attached to brackets 8, 8 fixed to the lower end of the side frame 2B.
is pivotally attached to the body part 4 located at the center of the upper spanning support arm part of the support frame 2, and is pivotally attached to the body part 4 located at the center of the upper spanning support arm part of the support frame 2. Arm 4 pivoted to
By attaching a screw shaft 5B to the free end of A, which is rotatably operated via a handle 5A and moved in the axial direction thereof, a raising/lowering operation mechanism 5 for adjusting the plowing depth is provided for steplessly adjusting the plowing depth.

Between the grounding sled bodies 3, 3 and the lifting operation mechanism 5, rods 6A, 6A are pivotally connected from the free ends of the grounding sled bodies 3, 3, respectively, and the front loading lifting operation mechanism 5 simultaneously Swinging arms 6B, 6B that are swing-operated are provided corresponding to the rods 6A, 6A, respectively, and the free ends of the swinging arms 6B, 6B and the rods 6A, 6A are connected at the connecting position to the rod 6A. , 6A are connected in a longitudinally changeable manner to the rods 6A, 6A, and swing arms 6B,
By changing the connection position of the free end portion of 6B, the plowing depth adjustment range of the left and right sled bodies 3, 3 relative to the swing range of the swing arms 6B, 6B can be changed in the vertical direction for each left and right side. A mechanism 6 is provided.

In addition, 9 in the figure is the cover of the rotary tillage device 1, 1
0 is a lift arm that swings up and down the rotary tillage device 1.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the tilling depth adjusting device for a tiller according to the present invention, with FIG. 1 being an enlarged side view of the main part, and FIG. 2 being an enlarged rear view with a part cut away of the main part. DESCRIPTION OF SYMBOLS 1...Rotary tillage device, 2...Support frame, 3...Earth sled body for adjusting tillage depth, 4...Upper machine frame portion, 5 ...Elevating and lowering operation mechanism for adjusting tillage depth, 6 ...Adjustment mechanism.

Claims (1)

[Scope of utility model registration request] In a side drive type rotary tiller in which the rotary tiller 1 is pivoted between the lower ends of a pair of left and right transmission cases 2A and a side frame 2B that constitute a gate-shaped support frame 2, the transmission case 2A and A pair of left and right grounding sleds 3, 3 for adjusting plowing depth are pivoted to the lower end of the side frame 2B so as to be able to swing up and down with rotation centers X, X in the vicinity of the lower end, and the support A screw is attached to the free end of an arm 4A which is swingably pivoted to the machine frame part 4 located in the center of the upper spanning support arm part of the frame 2, and which is rotatably operated via a handle 5A and moves in its axial direction. A lifting and lowering operation mechanism 5 for adjusting tillage depth that adjusts the tillage depth steplessly by attaching the shaft 5B.
A rod 6 is provided between the sled bodies 3, 3 and the lifting/lowering operation mechanism 5 from the free end of each of the sled bodies 3, 3.
A, 6A are pivoted upward, and
The swing arms 6B, 6B, which are simultaneously swing-operated by the lift operation mechanism 5 , are connected to the rods 6A, 6A.
The swing arm 6 is provided correspondingly to each
An adjustment mechanism in which the free ends of B and 6B and rods 6A and 6A are installed in the longitudinal direction so that the positions can be changed and fixed, and the plowing depth adjustment range of the left and right sled bodies 3 and 3 can be changed in the vertical direction separately. 6. A tillage depth adjustment device for a tiller, characterized in that it is provided with : 6 , 6 .