JPH078Y2 - Automatic height adjuster in cultivator with nonlinear characteristics - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an automatic height adjusting device capable of performing a vertical swing motion adapted to traction resistance in a cultivator.

[Conventional technology]

In order to respond to the traction resistance applied to the cultivator, one of a tension spring and a compression spring is interposed as an up-and-down swing supporting force means to constitute an automatic height adjustment mechanism.

[Problems to be solved by the device]

The traction resistance applied to the cultivator varies widely depending on the type of nail used and soil conditions. As described above, the elastic member provided in the automatic height adjusting device for various large and small traction resistances has conventionally used one of a compression spring and a tension spring. The mode of action using this kind of spring naturally shows a linear characteristic.

When the elastic degree of the elastic member to be used is set weak, the elastic member is crushed when strong resistance occurs, and when the elastic degree is set strong, the elastic member does not work when the resistance is weak.

Therefore, this invention uses two kinds of elastic members, one is provided with a weak resistance spring that acts with a weak resistance and the other is provided with a strong resistance spring that acts with a strong resistance. The resistance for strong resistance automatically acts when the resistance limit of the resistance spring is exceeded, and the resistance of two types of elastic members of strength and weakness changes from time to time depending on the degree of traction resistance. It is intended to act by reacting immediately to.

[Means for Solving the Problems]

As a means for achieving the above object, the mid-bone beam and the channel beam are pivotally arranged so that a front and a rear link form a parallelogram with a front low rear height and the front link. From the entire circumference of the arc-shaped guide rod when it is naturally left on the arc-shaped guide rod that is pivotally attached to the pivotal connection point of the lower end and the mid-bone beam, and is slidably engaged with the channel beam. Also, a compression spring having a short length is surrounded, and a tension spring is bridged between the upper end pivotally attached portion of the front link and the lower end pivotally attached portion of the rear link.

Further, a spacer is provided at the front, rear, or at least one end of the compression spring surrounded by the arc-shaped guide rod so that the elasticity of the compression spring can be adjusted.

[Action]

According to this invention, a mid-bone beam equipped with a gauge wheel and a claw has a rear link at a high position when a channel beam connected through front and rear links forming a parallelogram is fixed. Since a tension spring is stretched between the lower link pivot part of the rear link and the upper link part of the front link, the front link and the rear link can be attached to the horizontal line when the traction resistance is equal to nothing. And a state in which they are close to each other is maintained.

If traction resistance is generated on the side of the mid-bone beam from such a state, the tension spring is stretched against its elastic force, and each of the front and rear links rotates about each pivot point, In addition, it shifts from the vertical state to a slanted state, and with this operation, the arcuate guide rod also gradually moves the engagement position with the channel beam downward, and the final stage at that stage is
The first operation period is until the upper end of the compression spring surrounded by the arc-shaped guide rod comes into contact with the channel beam. In this first operation period, the height up to the ascending position of the vertical oscillation of the mid-bone beam is reached. The primary height (h) is defined as a weak traction resistance operation section, and when a traction resistance larger than this weak traction resistance is received, the compression spring is compressed against its elasticity,
The mid-bone beam plunges into the range of the secondary height (H) and swings up and down.

In this way, the support range of the working ammunition differs depending on the magnitude of the traction resistance applied to the mid-bone beam, and the vertical swing range can be changed according to the action.

Further, in the case where the action of the compression spring in the above-mentioned strong traction resistance operation section is desired to be changed depending on the shape of the claw or the soil quality, either end of the compression spring and the channel beam or the mid-bone beam which is the contact support member It is possible to change the above-mentioned primary height (h) and secondary height (H) by interposing a spacer having an arbitrarily set length on either one of them, or both of them in some cases.

〔Example〕

An embodiment of the present invention will now be described with reference to the drawings. A front bracket (11) is attached to the upper front part of the mid-bone beam (3) on which the gauge wheel (1) and the claws (2) are mounted, and a parallelogram is formed. The lower end of the front link (4) forming one side is rotatably pivoted about the shaft (12) to make the pivot point the axial point (A), and it is rearward and higher than the axial point (4). A rear bracket (13) is provided at a high position of the secondary beam (5) in which the mid-bone beam (3) is raised so that it can be formed as an axial point (B) at the same position as the front link (4). , And the lower end of the rear link (6) corresponding to the link (4) is the axis (1
The pivot beam is pivotally attached at 2), and the channel beam (8) attached to the main frame (7) is connected to the axial points (A) and (B), and the front lower rear high lower diagonal line ( E) The upper oblique line (F) parallel to E is attached and fixed so that it can be present, and the shaft hole formed at the lower end of the upper oblique line (F) is the axial point (C), and the upper end of the front link (4) is The rear link (6) is pivotally attached by a pin (14), and the upper end of the rear link (6) is also pivotally attached by a pin (14) in a shaft hole formed at the upper end of the upper diagonal line (F). Then, the position is determined as the axis point (D).

In addition, the lower end is pivotally attached to the mid-bone beam (3) side by the shaft (12) at the axial point (A), and the arc guide rod (10) is slidably engaged with the channel beam (8) above. ,
The compression spring (9), which is shorter than the circumference of the arc-shaped guide rod (10), is circumferentially engaged. The length of this compression spring (9) is such that the arc-shaped guide rod (10) is a channel beam. Set the degree of elasticity held so that the upper end can abut the channel beam (8) after contact sliding for the set distance in (8), the shape of the scratching claw, and the traction resistance due to the soil quality used, etc. It is a thing.

Further, the outer sides of the front and rear ends of these compression springs (9) can be provided with a spacer (16) having an arbitrarily set length at at least one end.

And, further, the pin (1
The tension spring (17) is stretched between the shaft (12) pivotally attached to the lower end of the rear link (6) and the rear link (6).

In the figure, reference numeral (15) is the arc-shaped guide rod (10).
Shows a retaining pin provided at the tip of the, (h) shows the primary height, and (H) shows the secondary height.

[Effect of device]

This invention works based on the above-mentioned structure, and the traction resistance applied to the cultivator during work also follows sudden changes in resistance value such as large resistance and small resistance that cannot be predicted, especially for weak resistance. By mounting the tension spring, the elasticity of the compression spring acting when the action limit of the tension spring is exceeded can be strongly set, so that the pulling resistance can be set to act in a wide range from weak to strong. Is to have.

[Brief description of drawings]

FIG. 1 is a side view of a cultivator for explaining different actions depending on the degree of traction resistance, and FIG. 2 is a side view showing a relationship between an arcuate guide rod, a compression spring, and a spacer. (3) ... Middle bone beam, (4) ... Front link, (6) ... Rear link, (8) ... Channel beam, (9) ... Compression spring,
(10) ... Arc guide rod, (16) ... Spacer,
(17)… tension spring.

Claims (2)

[Scope of utility model registration request] 1. A mid-bone beam and a channel beam are pivotally arranged so that a front-rear and two rear-links form a front-rear-rear-high parallelogram, and the lower end of the front link and the mid-bone are formed. A length shorter than the entire circumference of the arc-shaped guide rod when it is naturally left on the arc-shaped guide rod that is pivotally attached to the beam and is slidably engaged with the channel beam. The automatic height change in a cultivator having a non-linear characteristic is characterized in that the compression spring is surrounded, and a tension spring is bridged between the upper end pivotal connection portion of the front link and the lower end pivotal connection portion of the rear link. Adjustment device. 2. A compression spring surrounded by an arcuate guide rod is provided with a spacer at the front and / or rear end of at least one of the compression springs so that the elasticity of the compression spring can be adjusted. Item 2. An automatic adjustment device in a cultivator having a non-linear characteristic according to item 1.