JPH0114081Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plow bottom safety device provided between a frame and a bottom pivoted to the frame. Plow bottom safety devices are used to prevent damage to the plow by allowing the bottom to escape when the plow hits an obstacle during work.

Conventional bottom safety devices consist of a shear pin that penetrates the bottom and frame. If the bottom hits an obstacle such as a stone or tree root in the soil during work, the shear pin breaks due to the impact force, allowing the bottom to evacuate and prevent the plow from moving. Damage had been prevented. However, since the cut sear pin must be replaced with a new one, the cost of the sear pin is high, and
There was a problem in that it took a long time to restart work because the replacement work was troublesome.

An object of the present invention is to provide a plow bottom safety device that solves the above problems.

As a technical means to achieve the above problem,
The device of the present invention includes a first pin that pivotally connects the bottom to the frame, a pivot link that has one end pivoted to the frame via a second pin, and one end that connects the other end of the pivot link to the frame via a third pin. and a connecting link whose other end is pivoted to the bottom via a fourth pin, a tensioning means for pulling the four-bar link toward the first pin, and a rotation link. The pin receiving groove is formed to receive the fourth pin when it comes to a position near the bottom dead center between the second and third pins.

During work, the bottom is fixed to the frame by the first pin and the fourth pin that is connected to the pin receiving groove, but when the bottom hits an obstacle, the fourth pin resists the tensioning means and escapes upward from the pin receiving groove. As a result, the bottom is evacuated and the plow is spared damage.

The apparatus of the present invention will be explained based on the embodiments shown in the drawings. As shown in FIG. 1, the bottom beam 20 is connected to the frame 10 of the plow through the first pin 11.
The upper end of is pivoted. A rotating link 15 is pivotally attached to the frame 10 via a second pin 12, and the rotating link is pulled toward the first pin 11 by a tensioning means 30.

As shown in FIG. 2, the beam 20 is pivotally attached to the frame 10 via the first pin 11, and
The lower end of the rotation link 15 is pivotally attached to the frame 10 via. When viewed from the side, the pivot link 15 intersects with the beam 20 in the normal position, and the fourth pin 14 is implanted in the portion of the beam 20 that intersects with the pivot link 15. A third pin 13 is provided at the upper end of the rotation link 15, and a connecting link 16 is provided to connect the third pin 13 and the fourth pin 14. A pin receiving groove 17 is carved in the rotation link 15, and when the fourth pin 14 comes to a position close to the bottom dead center between the second pin 12 and the third pin 13, the pin receiving groove 17 receives the fourth pin 14. Form to accept. Adjustment screw 1 that comes out from the back of the rotation link 15 to the bottom of the pin receiving groove 17
8 is preferably provided so that the position of the fourth pin 14 within the pin receiving groove 17 can be adjusted. frame 1
A bracket 31 is fixed at 0, and a lever 32 is attached to the bracket so as to be rotatable about half a turn. A plate 33 is rotatably attached to the third pin 13, and a coil spring 34 is stretched between the lever 32 and the plate 33. When the lever 32 is lowered, the coil spring 34
becomes tense and attracts the rotating link 15 toward the first pin 11 via the third pin 13, but when the lever 32 is raised, the coil spring 34 relaxes and the rotating link 15 becomes free.

As shown in FIG. 3, the first pin 11 and the fourth pin 14 are independent, but the frame 10 surrounding the beam 20, the third pin 13, the rotation link 15, the connecting link 16, and the plate 33 are made of a sturdy two-piece structure. It has a heavy structure.
Although not shown, it is preferable that the coil spring 34 and lever 32 shown in FIG. 2 also have a double structure to make them sturdy.

Next, the operation of the device of the present invention will be explained in Figures 4 to 6.
This will be explained based on the diagram. During work, if the bottom hits an obstacle such as a rock or a tree root, the impact causes the beam 20 to rise in the direction of arrow A, as shown in FIG. Since it rotates in the direction of arrow B, the connecting link 16 rotates in the direction of arrow C shown by an imaginary line, and the fourth pin 14 separates from the pin receiving groove 17 at the dead center of the four-bar link. As shown in FIG. 5, when the connecting link 16 further rises in the direction of arrow C and the position of the fourth pin 14 crosses the axis of the coil spring 34, the tension of the coil spring 34 is transferred via the third pin 13. The beam 20 rises further in the direction of the arrow A as the pivot link 15 is again attracted. When the beam 20 is raised to the position shown in FIG. 6, the bottom is safely clear of the obstruction and there is no risk of damage to the plow.

In order to continue the work, the beam 20 must be returned from the position shown in FIG. 6 to the position shown in FIG. If you lower the lever and turn the connecting link 16 in the opposite direction, fit the fourth pin 14 into the pin receiving groove 17 of the rotating link 15, and then turn the lever 32 in the opposite direction to D, the state shown in Fig. 1 can be easily obtained. , the effort and time required to resume work is minimal. Also, the beam 20 can be lowered to point 2 shown in Fig. 1 without operating the lever.
1 into the soil and the tractor is moved backward, the fourth pin 14 automatically fits into the pin receiving groove 17.

As mentioned above, the device of this invention not only safely evacuates the bottom when it hits an obstacle during work to prevent damage to the plow, but also allows the bottom to return to its original position very easily, allowing work to resume quickly. Therefore, compared to conventional shear pin safety devices, there is no need for spare sear pins or troublesome and time-consuming replacement work, and the excellent effect of helping to reduce the cost of plowing operations can be achieved.

[Brief explanation of the drawing]

Figure 1 is a side view of a plow equipped with the device of the present invention, Figure 2 is an enlarged view showing the main parts of the plow in Figure 1 with some parts cut away, and Figure 3 is taken along the - line in Figure 2. The sectional views, FIGS. 4 to 6, correspond to FIG. 2, showing the operation of the apparatus of the present invention. 10: Frame, 11: First pin, 12: Second pin, 13: Third pin, 14: Fourth pin, 15:
Rotating link, 16: Connecting link, 17: Pin receiving groove, 20: Beam (bottom), 30: Tensioning means,
32: lever, 33: plate, 34: coil spring.

Claims (1)

[Claims for Utility Model Registration] 1. A first pin for pivotally connecting the bottom to the frame, a rotating link having one end pivotally attached to the frame via a second pin, and a third pin at the other end of the rotating link. a connecting link having one end pivotally attached via a pin and the other end pivotingly attached to the bottom via a fourth pin;
It consists of a tensioning means for pulling the pivot link toward the first pin, and a pin receiving groove provided in the pivot link, and the pin receiving groove is connected to the fourth pin located between the second and third pins. A plow bottom safety device configured to receive a pin. 2. The tensioning means consists of a lever partially rotatably pivoted to the frame and a spring provided between the levers, and the pivoting link is tensioned when the lever is lowered and relaxed when the lever is raised. A plow bottom safety device according to claim 1 of the utility model registration claim, characterized in that: 3. The bottom safety device for a plow according to claim 1, wherein the pin receiving groove is provided with an adjustment screw for adjusting the receiving position of the fourth pin.