JPH0476641B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a reversing device for a reversible plow device, and more specifically, it relates to a reversing device for a reversible plow device, and more specifically, it is not a manual reversing device or a hydraulically driven reversing device.
The present invention relates to a reversing device that utilizes a lift mechanism included in a tractor.

[Conventional technology]

The conventionally known reversible plow device is
Equipped with a bottom symmetrically above and below the plow frame,
By contracting and extending the hydraulic cylinder with the plow frame linked, the plow frame can be moved 90 degrees, totaling 180 degrees.
A specific example is the one disclosed in Japanese Unexamined Patent Publication No. 118001/1983.

[Problem that the invention seeks to solve]

As mentioned above, the reversible plow device uses a hydraulic cylinder device as the power source for reverse drive, so it is suitable for large tractors, but it is not particularly suitable for equipping small tractors. There has come to be a need for something suitable for tractors.

[Means for solving problems]

Therefore, this invention provides top link and
A plow frame with a vertically symmetrical bottom is rotatably installed on the mast frame supported by an atupa link, and the tractor and mast frame are connected not only by a three-point hit but also by a chain, allowing the lift movement of the tractor to The plow frame is then rotated by 90 degrees, and the release of the energy stored in the spring is used to rotate the plow frame by 90 degrees. It is characterized by being configured so that it can be reversed without the need for.

[Example] Hereinafter, the structure of the present invention will be explained with reference to the example shown in FIGS. 1 to 4. First, reference numeral 10 indicates a tractor, and a three-point hit mechanism is provided with a top link 11 and a lower link 12. A link mechanism 13 is connected to the lower link 12 of the three-point hit mechanism.
A lift link 14 is connected to the lift link 14, and further,
A restraining member such as a chain 22 connects the drawbar 15 and a mast frame 21, which is formed by a pair of plates constituting the plow device 20 and spaced apart at appropriate intervals.

The plow device has a structure in which a plow frame 24, in which a bottom 23 is attached vertically to a mast frame 21, is rotatable by a rotating shaft 25.

The mast frame 21 is equipped with a reverse device 30, which will be described below.
That is, the rotary shaft 25 is fitted in a pipe-shaped bearing 26 provided on the mast frame 21, and the tip of the arm 31 is connected to the rotary shaft 25 through an arm 31 that serves as a moment arm with respect to the rotary shaft 25. One end of the turnbuckle 32 is connected, and the other end of the turnbuckle 32 is connected to the lower end of a shuttle bar 33 that is allowed to move only in the vertical direction.

The shuttle bar 33 passes through a shuttle holder 34 fixed to the mast frame 21, and is configured such that only vertical movement is allowed by the shuttle holder 34.
There is a notch 33 on the tractor side of No. 3, in other words, on the back.
A is formed in the notch 33a, and a shuttle lock 36, which is constantly pushed by the push rod 35, fits into this notch 33a to restrain the shuttle bar 33. This shuttle lock 36 has a fulcrum portion 36a extending from the side surface of the mast frame 21.
It can be rotated along a horizontal plane around the shuttle bar 33, and is pushed against the shuttle bar 33 by the behavior given to the push rod 35, and the hook 37 acts when it escapes from the notch 33a.
is locked at the tip of the shuttle lock 36. A notch 33b is formed in the side surface of the upper end of the shuttle bar 33 on the side opposite to the tractor, into which a head hook, which will be described later, is engaged.

Further, a triangular center arm 42 is pivotally attached to the side surface of the mast frame 21 via a support shaft 41, and a free arm 43 is pivotally attached to this center arm 42 by the support shaft 41. The end of the arm 43 extends toward the tractor, and the end of the chain 22 is attached via a turnbuckle 22a. A lock pin 44 is attached to the center arm 42 and has a tendency to always protrude by a spring 44a.
It fits into the hole.

Furthermore, the base end of the hook 37 is pivotally attached to the center arm 42 via a pivot 45, and the base end has slopes 37b on both sides of the apex 37a.
The apex 37a is the free arm 4.
It touches the edge of 3.

A spring support shaft 4 is attached to the top end of the mast frame 21.
A head arm 47 is pivotally connected via 6,
A head hook 4 is attached to the tip of this head arm 47.
8 is pivotally connected by a pivot 49, and the end of a side rod 51 constituting an energy storage mechanism between this pivot 49 and a pivot 50 at the tip of the center arm 42 is attached by boss parts 51a and 51b. There is. Boss parts 51a, 51b and side lock 51
A compression spring 53 is interposed between a spring receiver 52 which is free from each other but is integral with the boss portion 51b, and a flange 51c formed at the end of the side lock 51.

The opposite end of the head hook 48 is a U-shaped end 48a, into which a head hook stopper 54 protruding from the side surface of the head arm 47 is loosely fitted. The tilt of the head hook 48 is limited.

Further, the head arm 47 is connected to the connecting rod 5.
5 and a spring 56 that pushes it down, the head hook 48 is given the habit of rotating about the support shaft 46 in the direction in which it grips the shuttle bar 33.

Next, a bottom reversing operation using the reversing device of the present invention will be explained. First, in the state shown in FIG. 2, one of the bottoms 23 is in the normal position, so to reverse this, the lock pin 44 is pulled out against the protruding tendency of the spring 44a, and the center arm 42 and free arm 43 are separated. The connection state of the parts is released and each part is adjusted. That is, it is not desirable for safety if rotational motion is immediately transmitted to the plow frame due to the drive of the lift link 14, so first remove the lock pin 44 and remove the center arm 4.
2 and the free arm 43 are temporarily released, and after adjustment, both arms are connected again with the lock pin 44. By driving the link mechanism 13 provided on the tractor 10, the plow device 20 is raised via the lower link 12. Then, no change occurs within the slack range of the chain 22, but when the plow device 20 is lifted beyond the slack range of the chain 22,
Since the overall length of the chain 22 does not change, the free arm 43 is allowed to rotate about the support shaft 41. As the free arm 43 rotates, the center arm 42 also rotates around the support shaft 41, and the boss portion 5 provided at the end of the center arm 42 rotates.
1b is forced to rise. This boss portion 51b
As the spring rises, the compression spring 5 is compressed by the spring receiver 52.
3 is compressed, and the side rod 51 is pushed up by the pushing force received by the flange 51c,
The head hook 48 hooks the shuttle bar 33 and pulls it up.

At the same time as this movement, the hook 37 attached to the center arm 42 via the pivot shaft 45 rotates against the pressure of the push rod 35, and this rotational movement causes the shuttle lock 36, which is locked to the hook 37, to lock onto the shuttle bar 33. It is made to escape from the notch 33a. As a result, shuttle bar 3
3 is released and rises in conjunction with the lift movement, the head hook 48 pulls the shuttle bar 33 while the rear of the head hook 48 is held in the notch 33b of the shuttle bar 33, and then the arm 31 is released through the turnbuckle 32. is vertical (4th
) and rotated to top dead center (UDP). This rotation is performed using the lift drive and the stored energy of the compression spring 53. and,
When the top dead center UDP is reached (the state shown by the imaginary line in Figure 2), the locking state between the shuttle bar 33 and the head hook 48 is released, and until then, the shuttle bar 33 and the head hook 48 are rotated by the energy obtained from the compression of the compression spring 53 accompanying the lift movement. The plow frame 24, which had been holding the plow, rotates under the force of gravity, and the bottom is turned over.

Specifically, due to the upward linear movement of the shuttle bar 33, a reversing torque is applied to the arm 31 until it passes the top dead center (UDP), and then the plow frame rotates using inertia, and the upper and lower bottoms are reversed. Ru.

At the same time, the head arm 47 is returned to the state shown by the solid line in FIG. 2 by the spring 56, and the head hook 48 catches the notch 33b of the shuttle bar 33 and lowers (reverses) the plowing device 20, thereby making it possible to plow.

The rotation range of the plow frame 24 is adjusted using the arm 31.
The length of the chain 22 is adjusted by the turnbuckle 32 connected to the chain 22, and the tension of the chain 22 is adjusted by the turnbuckle 22a.

〔Effect of the invention〕

As is clear from the above description, the reversing device of the reversible plow device of the present invention utilizes the lift-up operation accompanying the reversing motion, and also uses the stored force of the compression spring to first rotate the plow device at right angles. Since the plow device is configured to rotate by the remaining right angle using its inertia, a power source for reversing the plow device is not required, and a reversing device with a simple configuration can be provided.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a schematic side view showing the relationship between a tractor and a reversible plow device, FIG. 2 is a side view of the reversing device, and FIG. The sectional view, FIG. 4, is a plan sectional view taken along line 2-- in FIG. 10...Tractor, 11...Top link, 1
2... Lower link, 13... Lift mechanism, 14...
... Lift link, 15 ... Drawbar, 20 ... Plow device, 21 ... Mast frame, 22 ... Chain, 23 ... Bottom, 30 ... Reverse device,
31...Arm, 32...Turnbuckle, 33...
Shuttle bar, 33a, 33b...notch, 34...
...Shuttle holder, 35...Push rod, 3
6...Shuttle lock, 37...Hook, 41...
... Support shaft, 42 ... Center arm, 43 ... Free arm, 44 ... Lock pin, 44a ... Spring, 45 ... Pivot, 46 ... Support shaft, 47 ... Head arm, 48 ... Head hook, 49,50
...Axis, 51...Side lock, 51a, 51
b... Boss portion, 52... Spring holder, 51c... Spring holder, 53... Compression spring, 54... Head lift stop, 55... Adjuster stroke, 56... Spring.

Claims (1)

[Claims] 1. In reversible plow equipment, which is equipped with a plow frame that is rotatably attached to a mast frame that is attached to a tractor via top and lower links, and a bottom above and below the plow frame, a plow installed between the mast frame and the tractor. the plow frame is compressed by the lift of the plow frame and has an energy storage mechanism having a spring that pulls up the plow frame, and is configured to rotate the plow frame to top dead center by the energy of the energy storage mechanism. A reverse device characterized by: