JPH077Y2 - Automatic height adjustment device in cultivator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an automatic height adjusting device capable of increasing the vertical swing stroke of a cultivator.

[Conventional technology]

In the horizontal state, the upper surface of the mid-bone beam is one side of the horizontal line, and the lower ends of the front and rear links of the same length that form a parallelogram are rotatably pivoted, and the upper ends of those links are To be parallel to the bone beam, pivotally attached to the channel beam mounted on the main frame, and pivotally attach the lower end of the arc-shaped guide rod surrounding the compression spring to the pivotal connection cylinder location of the front link and the midbone beam, A general-purpose model is known in which a cultivator mechanism in which an upper end of a surrounding compression spring is locked is constructed while allowing the upper part thereof to be slidably engaged with the channel beam.

[Problems to be solved by the device]

In the above-mentioned conventional cultivator, as shown in the first drawing, an upward pressure is exerted against the elastic force of the compression spring due to an abnormal pressure when an obstacle from the front comes in contact with the rawl attached to the mid-bone beam. Even if you can rotate and avoid obstacles,
The height stroke (h) in the vertical direction is limited to the range until the compression spring comes into close contact.

Therefore, if it is attempted to increase the stroke (h), it is possible to achieve the purpose by increasing the lengths of the arcuate guide rods along with the front and rear links that are parallel to each other. With such a structure, the overall height of the device becomes large, and the arc-shaped guide rod also largely protrudes upward, which results in a disadvantage.

In contrast to the above-mentioned conventional cultivator, the present invention makes the length of the parallel link the same as that of the conventional form, and the parallelogram formed in the conventional machine has two sides in a horizontal state. In the above, the parallelogram itself is inclined, that is, the pivotal position of the lower end of the rear link is set higher than the pivotal position of the lower end of the front link with respect to the midbone beam, which is basically in the horizontal state. In accordance with this, the purpose is to increase the vertical swing height stroke of the mid-bone beam by mounting it on the main frame so that the channel beams that pivotally connect the upper ends of the front and rear links also have a front low rear height. It is what

[Means for Solving the Problems]

This invention is, as means for achieving the above-mentioned object,
The lower end of the front link forming one side of the parallelogram is pivotally rotatably attached to the front part of the upper surface of the mid-bone beam to which the gauge wheel and the claws are attached to form the axial point (A), and the axial point. Axial point (B) at a position higher than and behind (A)
Is formed into a secondary beam on the mid-bone beam, and the lower end of the rear link corresponding to the front link and having the same length as that of the link is pivotally rotatably attached, and is separately attached to the main frame. The channel beam is mounted and fixed so that an upper oblique line (F) parallel to the front lower rear high oblique line (E) connecting the axial points (A) and (B) can be included, and the lower end of the upper oblique line (F) is fixed. Is an axial point (C), and the upper end of the front link is rotatably pivoted,
Further, the upper end of the rear link is also rotatably attached to the rear upper end of the upper oblique line (F) so as to form an axial point (D), and further, an arc-shaped guide rod surrounding a compression spring. The lower end of the shaft is pivotally attached to the axial point (A), the upper part of the pivotal position is slidably engaged with the channel beam, and the upper end of the enclosed compression spring is locked. is there.

[Action]

According to this invention, a mid-bone beam equipped with a gauge wheel and a claw has a set length when the channel beam connected via front and rear links forming a parallelogram is fixed.・ A vertical swing stroke equivalent to the effective length of the rear link can theoretically be obtained.

That is, the angle from the vertical state of the front and rear links to the horizontal state is 90
This is because the range of degrees is the rotatable section.

However, in actuality, the magnitude of the stroke is affected by the circumferential distance of the arc-shaped guide rod pivotally attached to the mid-bone beam and the configuration shape of the compression spring surrounded by the arc-shaped guide rod.

The factor that most affects the stroke size is determined by the cross-sectional diameter of the compression spring steel single material and the number of turns thereof.

If the front and rear links are formed so that when the horizontal links are rotated, the compression springs locked to the slanted channel beam are brought into close contact with each other or immediately before that, the theoretical link length described above is obtained. The height can be a vertical swing stroke.

Further, when the compression spring reaches the close contact state before the front and rear links become horizontal due to the rotation, and the front and rear links cannot rotate to the horizontal position, they pass through the axial point (A). If there is a height difference between the horizontal line below the axis (C) with respect to the horizontal line and the horizontal line, the stroke obtained by subtracting the height difference dimension from the effective length of the front and rear links becomes the vertically swingable stroke. It is a thing.

〔Example〕

An embodiment of the present invention will now be described with reference to the drawings. An anterior bracket (11) is attached to the front part of the upper surface of the mid-bone beam (3) to which the gauge wheel (1) and the claws (2) are attached, and a parallelogram is formed. The lower end of the link (4) forming one side is rotatably pivoted about a shaft (12), and the pivot point is defined as an axial point (A), which is rearward and higher than the axial point (A). A rear bracket (13) is provided at a high position of the sub 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 and has the same length as the front link (4). And, the lower end of the rear link (6) corresponding to the front link (4) is pivotally mounted on the shaft (12) so as to be rotatable, and, apart from this, the channel beam (8) mounted on the main frame (7). There may be an upper diagonal line (F) that is parallel to the lower diagonal line (E) that connects the axial points (A) and (B). As described above, the shaft hole formed at the lower end of the upper oblique line (F) is used as an axial point (C), and the upper end of the front link (4) is pivotally mounted by a pin (14). Further, the upper end of the rear link (6) is also rotatably pivoted by a pin (14) into a shaft hole formed at the rear upper end of the upper diagonal line (F), and the position is defined as an axial point (D). Establish.

Further, the lower end of the arcuate guide rod (10) surrounding the coiled compression spring (9) is pivotally attached to the midbone beam (3) side at the axis (12) of the axial point (A) and its upper position. To slidably engage the channel beam (8),
Moreover, the upper end of the surrounding compression spring (9) is brought into contact with and locked to the lower surface of the channel beam (8).

In the figure, reference numeral (15) indicates a retaining pin provided at the tip of the arc-shaped guide rod (10), and (H) indicates a vertical swing stroke in the present invention.

FIG. 1 is a side view of a cultivator showing a conventional example, and the same parts as those of the cultivator shown in FIG.

[Effect of device]

This invention operates based on the above-mentioned configuration, and by connecting the mid-bone beam and the channel beam to act the parallelogram, the front and rear links have a pivoting positional relationship of front low rear high, , Within the required rotation range of the front and rear links,
The contact phenomenon between the mid-bone beam and the channel beam can be avoided, and a large up-and-down swing stroke corresponding to the effective lengths of the front and rear links can be obtained, so obstacles that could not be avoided in the past can be handled without obstacles. This is effective in preventing damage to the cultivator.

[Brief description of drawings]

FIG. 1 is a side view of a conventional cultivator, which shows a vertically swinging state, and FIG. 2 is a side view of a cultivator of the present invention, which is cascaded to explain its operation. (1) ... Gauge wheel, (2) ... Scratch claw, (3) ... Medium bone beam, (4) ... Front link, (5) ... Sub beam, (6)
... rear link, (7) ... main frame, (8) ... channel beam, (9) ... compression spring, (10) ... arc-shaped guide rod, (A), (B), (C), (D) ... Axial point, (E) ...
Lower diagonal line, (F) ... Upper diagonal line.

Claims (1)

[Scope of utility model registration request] 1. A lower end of a front link forming one side of a parallelogram is pivotally rotatably attached to a front part of an upper surface of a mid-bone beam for mounting a gauge wheel and a claw to form an axial point (A). At the same time, the axial point (B) is formed in the secondary beam on the mid-bone beam at a position higher and rearward than the axial point (A), and has the same length as the front link and corresponds to the front link. The lower end of the rear link is rotatably pivoted, and the channel beam to be mounted on the main frame is different from the axial point (A),
The upper oblique line (F) which is parallel to the lower oblique line (E) connecting the (B) with the lower oblique line (E) is installed and fixed so that the upper oblique line (F)
The lower end of the front link is pivotally attached to the upper end of the front link, and the upper end of the rear link is also inclined upward (F).
Of the arc-shaped guide rod surrounding the compression spring is pivotally mounted to the rear upper end of the shaft to form an axial point (D). An automatic height adjusting device in a cultivator, wherein an upper part of the pivotal position is slidably engaged with the channel beam, and an upper end of a surrounding compression spring is locked.