JPS6335522Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bracket device in a three-point linkage mechanism installed in a mobile agricultural machine such as an agricultural tractor.

Generally, a three-point linkage mechanism is widely used to equip this type of mobile agricultural machinery with a working machine, but the bracket device for connecting the top link to the machine body is a fixed bracket fixed to the machine body side. It is formed by pivoting a movable bracket configured to receive the load from the work machine side through the machine, and when equipped with a towing work machine such as a plow, the load from the towing work machine side is greater than the traction force. Then,
A movable bracket rotates against the above-mentioned ammunition, and in conjunction with the movable bracket, the traction work machine is raised to reduce the traction force, thereby providing so-called "traft control". However, although working machines such as rotary tillers do not require draft control, the rotational fulcrum of the top link is placed at the rear to allow smooth separation from the ground when the work machine is lifted up, and the top link is In order to increase the lifting stroke of the work equipment even if the lifting angle is small, a connecting bracket is fixed to the movable bracket, and a so-called special three-point linkage mechanism is used to connect the top link to this connecting bracket. It may happen. However, since the connecting bracket is only removably fixed to the movable bracket via a fixing pin in order to be easily attached and detached, there is a drawback that there is a looseness between the movable bracket and the connecting bracket.

The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation, and even if the connecting bracket is detachably attached to the movable bracket, it will not be subject to the load from the work machine side. It is an object of the present invention to provide a bracket device in a three-point linkage mechanism that can reliably prevent rattling of a connecting bracket by using a bullet provided for the purpose.

The structure of the present invention will be explained based on an embodiment shown in the drawings. Reference numeral 1 denotes a running body of an agricultural tractor, and the rear of the running body 1 includes a top link 2 and a lower link 3. A rotary tiller 5, which is an example of a working machine, is connected via a three-point linkage mechanism 4. And rotary tiller 5
is adapted to be raised and lowered by a lifting arm (not shown) connected to the lower link 3.

Reference numeral 6 denotes a fixed bracket fixed to the rear part of the fuselage via a fixing bolt 7, and the fixed bracket 6
The lower end of a movable bracket 8, which is disposed opposite to the fixed bracket 6 at a predetermined distance, is rotatably attached to the support protrusion 6a protruding from the lower part of the bracket 8 via a support shaft 8a. . A restrictor 9 made of a bolt and nut is inserted between the upper ends of the brackets 6 and 8, and adjustably restricts the rotation of the movable bracket 8 toward the work machine. Reference numeral 10 denotes a two-ply plate spring-like bullet inserted in the gap between the brackets 6 and 8, and the base end of the bullet is supported by the support plate 10a in a pinched manner, and the bullet is attached to a fixing bolt. It is fixed to the lower side of the fixed bracket 6 via the bracket 7a, and its tip abuts against an abutment pin 8b protruding from the upper end of the movable bracket 8, thereby receiving the load from the working machine side. Further, a stopper 11 is rotatably attached to the fixed bracket 6, and the stopper 11 is loosely inserted between the fixed bracket 6 and the movable bracket 8, so that the stopper 11 can be attached to the movable bracket. It is designed to restrict the rotation of 8.

12 is a movable bracket 8 with a fixed pin 1 at its base end.
A connecting bracket 12 is detachably fixed via a connecting bracket 2a, and one end of a top link 2 is pivotally supported at the distal end of the connecting bracket 12 via a connecting pin 12b. A support plate 13 is integrally fixed to the base end of the connection bracket 12, and a press tool 14 is inserted through the support plate 13 so as to be freely retractable in the direction of the bullet. 14 is made to protrude in the direction of the ammunition 10, so that the head of the pressing tool 14 comes into contact with the ammunition 10 in a state in which the ammunition 10 is pressed and deformed toward the fixed bracket 6 side.

In addition, when carrying out towing work with a plow or the like, when the stopper 11 is released from the restricted position to allow the movable bracket 8 to rotate, the movable bracket 8 moves in the direction of arrow A due to an overload from the work machine side.
When the movable bracket 8 is rotated in the direction, the actuating piece 8c provided on the movable bracket 8 pushes the sensing body 15, and in conjunction with this, the lifting actuating arm (not shown) moves the lower link 3 upward, raising the towing industrial machine such as a plow. Draft control is now available to reduce overload.

Next, the operation of the present invention constructed as described above will be explained. Rotary tillage work in the field is
A stopper 11 is interposed between the fixed bracket 6 and the movable bracket 8 (in the dotted line position in FIG. 3) to restrict the rotation of the movable bracket 8 in the direction of arrow A, and the draft is not controlled. In this case, by operating the pressing tool 14 provided on the connection bracket 12,
As shown in FIG. 2, the ammunition 10 is transformed from a position (imaginary line position) where the tip abuts against the contact pin 8b of the movable bracket 8 to a position where it is elastically deformed toward the fixed bracket 6 (solid line position). A tool such as a spanner can be used for this, but if the upper fixing pin 12a of the pair of upper and lower fixing pins 12a that fixes the connecting bracket 12 is removed and the working machine is moved upward, the connecting bracket 12 rotates in the direction of arrow B around the lower fixing pin 12a,
The distance from the ammunition 10 is widened, and the pressing tool 14 can be easily projected. In this state where the ammunition 10 is elastically deformed by the protruding pressing member 14, the connecting bracket 12 is urged in the direction of arrow c. Therefore, the connection bracket 12 is pressed and biased toward the work machine together with the movable bracket 8.
The looseness caused by the connection bracket 12 being fixed to the movable bracket 8 via the fixed pin 12a and the looseness caused by the stopper 11 being loosely fitted between the fixed bracket 6 and the movable bracket 8 are absorbed. That will happen. Moreover, since the connecting bracket 12 is urged by the ammunition 10 in contact with the ammunition 10 at a position lower than the abutment pin 8b, the force is increased and rattling can be reliably prevented.

When carrying out towing work such as plowing, the stopper 11 is removed from between the fixed bracket 6 and the movable bracket 8, and the movable bracket 8 is removed.
is rotatable, and the pressing tool 14 is made rotatable.
If it is separated from 0, the ammunition 10 can come into contact with the abutment pin 8b of the movable bracket 8 and perform predetermined draft control.

In summary, the present invention pivots a movable bracket configured to receive a load from the working machine side via an ammunition to a fixed bracket fixed to the machine body, and a top link is pivotally connected to the movable bracket. A connecting bracket is removably attached to the connecting bracket, and a pressing tool that comes into contact with the ammunition is removably provided on the connecting bracket, and the fixed bracket includes:
Since a stopper is provided to restrict the rotation of the movable bracket when the connecting bracket is attached, and the connecting bracket is configured to be biased toward the working machine via the bullet, the connecting bracket can be attached to the movable bracket. When equipped with a working machine such as a rotary tiller, by restricting the rotation of the movable bracket with a stopper provided on the fixed bracket, it is easy to make the draft non-controlled. If the provided pressing tool that can come out and retract is pressed against the ammunition machine, the ammunition machine installed to receive the load from the work machine during draft control equipped with an indexing work machine such as a plow can be removed. The connecting bracket can be biased toward the working machine side by effectively utilizing this, and not only the shaking of the connecting bracket but also the shaking of the movable bracket can be reliably prevented.

[Brief explanation of the drawing]

The drawing shows one embodiment of the bracket device in the three-point linkage mechanism of the present invention.
The figure is an overall side view of the agricultural tractor, FIG. 2 is a side view of the main part, and FIG. 3 is a rear view of the main part. In the figure, 1 is a traveling body, 2 is a top link, 4 is a three-point link mechanism, 6 is a fixed bracket, 8 is a movable bracket, 8b is a fixed pin, 10 is a bomb, 12
is a connected bracket.

Claims (1)

[Scope of utility model registration request] A movable bracket configured to receive a load from the working machine side via an ammunition is pivotally attached to a fixed bracket fixed to the machine body side, and a connecting bracket to which a top link is pivotally connected is attached to and detached from the movable bracket. At the same time, the connecting bracket is provided with a pressing tool that comes into contact with the bullet and can be retracted freely, and the fixed bracket is provided with a stopper that restricts the rotation of the movable bracket when the connecting bracket is installed. A bracket device in a three-point linkage mechanism, characterized in that the bracket is configured to be biased toward the working machine via the bullet.