JPS6125611Y2 - - Google Patents

Description

[Detailed description of the invention] The invention provides a rotary device for a tractor.
The present invention relates to a tail wheel floating device for floating a tail wheel when plowing the edge of a corner corner of a field, and more specifically to a tail wheel floating device that does not require manual switching operations.

Conventionally, as this type of device, Japanese Patent Application Laid-Open No. 105404
The one described in the publication is known,
During normal tillage, the device is firmly fixed so that the angle θ between the upper link and the mast does not shift due to the engagement of the stopper and the locking piece based on the first and second link members. and,
Since the angle θ is set at the maximum plowing depth of the rotary, at plowing depths outside of the maximum plowing depth, the tail wheel will not work at all and will be in a floating state, so the plowing depth by the tail wheel will be reduced. It's becoming impossible to adjust. Additionally, if the tail wheel is located on soft ground during plowing work, the tail wheel will no longer support the rotary device and the rotary device will attempt to descend, but the angle θ between the upper link and the mast will not be displaced. It's fixed so it won't go down. Therefore, the force of the rotary device attempting to descend is amplified by the toggle link and acts directly on the pivot pin of the link member, potentially damaging the pin. Furthermore, in uneven fields, since the above angle θ is fixed, the vibration of the machine body is amplified and directly affects the rotary device, causing the rotary device to move up and down significantly, resulting in inconsistent plowing depth. .

Therefore, the present invention is based on the previously proposed Utility Application
This is an improvement on No. 150409 (Utility Model Application No. 56-68412), and the operating lever is extended in the direction of the upper link, so that when the rotary device is in the plowing position, the operating lever comes into contact with the upper link. When the rotary device is raised and the upper link and the mast are at a predetermined angle, the control lever contacts the upper link and the tail wheel is switched to the floating state. It is an object of the present invention to provide a tail wheel floating device for a rotary device which is configured as follows and eliminates the above-mentioned drawbacks.

EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be specifically explained along with embodiments shown in the drawings.

In FIG. 1, reference numeral 1 indicates a tractor body supported by rear wheels 2 and the like. The rear of the fuselage 1 is connected to a rotary device 7 by an upper link 6 via a lower link 3 and an upper support fitting 5 fixed to the fuselage 1.
is swingably supported, and the rotary device 7 is moved up and down by the lower link 3 being connected to a lift arm 10 via a lift rod 9. Further, the rotary device 7 receives power from a PTO shaft 11 protruding from the body 1 via a transmission shaft 12, and can rotate a rotary claw 15 rotatably supported by a rotary body 13.
Further, a mast 16 is fixed above the main body 13 and reinforced by a link 17, and the upper end of the mast 16 is connected to the tip of the upper link 6. Also, an arm 19 is provided at the rear of the main body 13.
A tail wheel 21 is rotatably supported at the tip of the arm 19 via a tail wheel support fitting 20. Furthermore, an adjustment screw 22 is pivotally supported on the arm 19, and the tip of the adjustment screw 22 is pivotally supported on the tip of an arm 23 that is pivotally supported on the mast 16, and the tip is connected to the tail wheel adjustment handle 25. It's summery. As shown in detail in FIGS. 2 and 3, the arm 23 is composed of two plates, with a hollow space in the middle, and a base end that connects the mast 16 and the link 17 with a connecting pin. 26 via a spacer 27, and its distal end is rotatably supported by the boss 22a of the adjusting screw 22. In addition, a shaft 29 bridges and is rotatably supported in the vacant space of the arm 23.
A stopper 30 is fixed to 9. Further, a floating control operating lever 31 is fixed to the protrusion on one side of the shaft 29.
1 extends forward at a predetermined angle so as to be located below the upper link 6, and its tip 31a is located below the upper link 6.
It is bent so that it can come into contact with the That is, when the rotary device 7 is in the lowering/plowing position and the angle θ between the upper link 6 and the mast 16 is large, the lever 31 does not come into contact with the upper link 6 and the rotary device 7 does not rise. When the above-mentioned angle θ reaches the predetermined angle θ ₁ shown in FIG. 5, the lever 31 comes into contact with the upper link 6. Further, a bracket 32 is fixed to the protrusion on the other side of the shaft 29, and a bracket 32 protruding from one end of the bracket 32 and the arm 23
A spring 34 is tensioned between the stopper 30 and the stopper 30, and biases the stopper 30 clockwise in FIG. Further, the stopper 30 has a protrusion 30a protruding outwardly on one side, and a holding surface 30b adjacent to the protrusion 30a, which is an arc centered on the shaft 29. Furthermore, arm 23
Elongated holes 23a, 23a are formed in each of the plates, and a pin 35 is inserted through these elongated holes 23a and is slidably supported, and is prevented from coming out by a retaining ring 36. The pin 35 is in contact with the stopper 30, and is connected to a link 37 made of two plates, the other end of which is pivotally supported by the mast 16. In Figure 1, 39 is the driver's seat, 40 is the rear cover, and 6th
41 in the figure and FIG. 7 is a ridge.

Since the present invention has the above-mentioned configuration, when performing normal plowing work, as shown in Fig. 1,
The rotary device 7 is in a lowered position, so the angle θ between the upper link 6 and the mast 16 is large.
The operating lever 31 is not in contact with the upper link 6. Then, as shown in FIG. 2, FIG. 3, and FIG. It is clamped and fixed between the upper end and the holding surface 30b of the stopper 30. As a result, the mast 16, arm 23, and link 37 constitute a three-bar link and are held in a fixed state, and the tail wheel 221 is stably held in a predetermined position via the adjusting screw 22, arm 19, and tail wheel support fitting 20. Ru. Note that the fixed state of the tail wheel 21 is the fifth
As shown in the figure, until the operating lever 31 comes into contact with the upper link 6, that is, the rotary claw 15 is maintained in the plowing range where it comes into contact with the field, and therefore, based on the adjustment of the adjusting screw 22 by the handle 25,
Plowing can be finely controlled by adjusting the height of the tail wheel 21. Further, the tail wheel 21 is fixed to the rotary body 13 side such as the mast 16, and therefore the rotary device 7 is supported by the tail wheel 21.

Next, when working on the ridge, use the lift arm 10.
The rotary device 7 is raised by rotating. Then,
The angle θ between the upper link 6 and the mast 16 gradually decreases, and when it reaches a predetermined angle θ ₁ as shown in FIG. As the angle θ ₂ becomes smaller, the operating lever 31 is rotated against the spring 34 due to contact with the upper link 6. As a result, the stopper 30 is rotated, and the pin 35 is rotated as shown in FIG. 4b.
The long hole 23a of the arm 23 is removed from the holding 30b of the arm 23.
It is in a floating state where it can move along. In this state, as shown in FIG. 6, when the tractor is brought to the edge of the ridge and the rotary device 7 is lowered, the tail wheel 2
1 comes into contact with the ridge 41, and as the rotary device 7 further descends, the adjusting screw 22 moves relative to the rotary body 13 in the direction of the arrow via the tail wheel fitting 20 and the arm 19. Then, the arm 23 becomes the boss 22
a, the pin 35 is rotated counterclockwise around the connecting pin 26, so that the pin 35 is inserted into the elongated hole 23a of the arm 23.
is slid downward along. As a result, as shown in FIG. 7, the rotary device 7 is lowered to a predetermined plowing depth without any hindrance, and the tractor can plow along the furrow while moving forward. On this occasion,
As the rotary device 7 descends, the operating lever 31 is released from contact with the upper link 6, and the stopper 3
0 is urged to rotate clockwise by the spring 34, but the pin 35 is located below the elongated hole 23a and abuts against the side surface of the stopper 30, so that rotation of the stopper 30 is prevented. . and,
When the tailwheel 21 separates from the ridge 41, the tailwheel 21 falls to the field due to its own weight, but in this state, the tailwheel 21 is obstructed by the tilled soil and cannot completely descend, so the rotary device 7 must be removed once. By lifting slightly, the arm 23 is rotated clockwise via the adjusting screw 22, and the pin 35 is slid upward along the elongated hole 23a. As a result, the stopper 30 is rotated by the spring 34 and holds the pin 35.
0b, and again stabilize and hold the tail wheel 2 at the fixed position described above.

As explained above, according to the present invention, the tail wheel 2
1, the height of the tail wheel 21 can be adjusted freely within the plowing work range, although it does not require any manual switching operations to switch to the floating state or from the floating state to the fixed state. The tailwheel 21 can be used to make fine plowing depth adjustments. In addition, in the plowing operation state, the tail wheel 21 is fixed to the main body 13 side, and the angle θ formed by the upper link 6 and the mast 16 can move to some extent due to play, so the rotary device 7
is supported by the tail wheel 21, so even if it is located on soft ground, no large force is applied to the pivot pin.
The pins will not be damaged, and even in uneven fields, the swinging motion of the machine body will not be directly transmitted to the rotary claws 15 via the upper link 6, and a substantially constant plowing depth can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a rotary device according to the present invention in a normal plowing state, Fig. 2 is a side view showing its tail wheel floating device, Fig. 3 is a front sectional view thereof, and Fig. 4 is a different one. In the operation explanatory diagram showing the state, a shows the tail wheel state, and b shows the floating state. Furthermore, FIGS. 5 and 6 are side views of the rotary device showing a state of transition to floating, and FIG. 7 is a side view of the rotary device showing a state of furrow plowing. 1...Tractor body, 3...Lower link, 6
...Top link, 7...Rotary device, 13...
Main body, 16... Mast, 21... Tail wheel, 22...
Adjustment screw rod, 23... Arm, 23a... Long hole, 3
0...Stopper, 31...Operation lever, 35...
...Pin, 37...Link, θ ₁ ...Predetermined angle.

Claims (1)

[Scope of utility model registration request] A rotary device that is mounted to the rear of a tractor body so that it can be raised and lowered by a lower link and an upper link, and that has a tail wheel at the rear, which has an elongated hole that connects a mast fixed to the main body of the rotary device and an adjustment screw for the tail wheel. A pin provided at the tip of a link connected by an arm and further pivoted to the mast is fitted into a long hole of the arm, and the pin is fixed to the end of the long hole or can be slid freely along the long hole. A stopper is provided to enable switching, and an operating lever connected to the stopper is extended in the direction of the upper link, so that when the rotary device is in a plowing position, the operating lever comes into contact with the upper link. First, the stopper is held in a position where the pin is fixed at the end, and when the rotary device is raised and the upper link and the mast are at a predetermined angle, the operating lever comes into contact with the upper link and the stopper is held in the pin position. A tail wheel floating device of a rotary device that has been switched so that it can slide freely into a long hole.