JPH02113802A - Check chain for 3-point linkage mechanism - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a connecting rod that is relatively unrotatably attached to a bracket on the side of a tractor main unit, and a connecting rod that is relatively unrotatably attached to a lower link of a three-point link mechanism. The present invention relates to a check chain for a three-point link mechanism, in which connecting rods are threadedly connected to both ends of a turnbuckle member.

[Conventional technology]

Conventionally, the check chain for the three-point linkage mechanism mentioned above is
For example, as disclosed in Japanese Utility Model Application No. 60'-85104, in order to prevent the turnbuckle member from rotating, a lock nut is attached to a connecting wood that is threadedly connected to the turnbuckle member.

[Problem to be solved by the invention]

According to the above-mentioned conventional method, it is troublesome to use a tool such as a spanner to warm up the lock nut when changing the overall length of the chain, and since the area around the lock nut is usually a narrow space, it is difficult to warm up the lock nut using a tool. One piece was difficult to perform.

An object of the present invention is to provide a check chain for a three-point linkage mechanism that has excellent length adjustment operability mainly by applying a tool to the turnbuckle.

[Means to solve the problem]

In order to achieve the above object, the present invention provides the aforementioned check chain for a three-point link mechanism, in which the turnbuckle member is formed into a hollow loop shape, and the protruding end of one connecting rod protrudes into the loop space. A rotation prevention pin that can be attached and detached from the opening of the loop space is attached to the portion, and when the pin is attached to the connecting rod, the pin and the inner surface of the loop space of the turnbuckle member come into contact with each other, thereby causing the rotation of the connecting rod to stop. It is characterized in that it is configured so that rotation relative to the turnbuckle member is prevented.

[For production]

According to the above configuration, if the pin of one connecting rod is removed,
The overall length of the check chain can be freely adjusted by rotating the turnbuckle member, and by attaching a pin to the protruding end of one of the connecting rods, the relative rotation between the connecting rod and the turnbuckle member can be adjusted. Therefore, the length of the check chain can be kept constant.

The pin is allowed to rotate slightly within the inner width of the turnbuckle member, but the angle of rotation is extremely small, so
The length of the check chain can be considered constant in practice.

〔Effect of the invention〕

Preventing and releasing the turnbuckle member from rotating with respect to the connecting rod is as simple as inserting and removing a pin from one of the connecting rods, so the turnbuckle member is prevented from rotating and released by tightening and loosening the lock nut. The operability has been greatly improved compared to the conventional structure, and the time required to adjust the check chain tension has been significantly reduced.

〔Example〕

Next, the present invention will be explained in detail.

Figure 4 shows the rear part of a tractor in which a rotary tiller (3) is connected to the rear part of a wheeled traveling body (1) via a three-point linkage mechanism (2) that can be driven and swung up and down so that it can be raised and lowered. It is shown.

To configure the link mechanism (2), a lower link (5a or 5b) is extended from each of the left and right sides of the traveling body (1) by a ball joint (6) so as to swing vertically and horizontally, A top link (7) is extended from the left and right center of the traveling body (1) by a ball joint (6) so as to swing vertically and horizontally, and a top link (7) is extended from the traveling body (1) so as to be able to swing vertically and horizontally. A pair of left and right lift arms (9a) that can be freely extended for swinging operation;
One (9a) of (9b) and one lower link (5a)
The other lift arm (9b) and the other lower link (5b
) is connected to the middle part of the tilling device (3) by a hydraulic cylinder (11) that performs rolling operation with respect to the traveling machine body,
Further, the lower link (5a) extends between the intermediate portions of both the lower links (5a) and (5b) and the traveling aircraft.
, (5b) is provided with a check chain (12) which can be expanded and contracted in a turnbuckle type to restrict the left and right swinging.

As shown in FIGS. 1 and 2, the check chain (
12) is the front rod (4) attached to the fuselage (1) side,
The rear rod (13) attached to the lower link (5a), (5b) side, and both these rods (4), (
It consists of a turnbuckle member (14) connecting the parts (13).

The front rod (4) is attached to the bracket (1) of the fuselage (1).
In a), lower links (5a) and (5b) are shown in side view.
) by engaging the U-shaped buckle member (16) fixed to the front end of the buckle member (15), which is pivotally supported vertically on the same axis as the fuselage (1). It is designed to be able to swing three-dimensionally against the surface.

The rear rod (13), the lower link (5a), (
A holder (18) having a U-shape in side view fixed to the rear end is attached to the vertical shaft (17) provided on the outer surface of the 5b).
.

(19) allows it to swing three-dimensionally relative to the lower links (5a) and (5b).

As shown in FIG. 3, the turnbuckle member (14) has two mouth-shaped plate members (21) provided with a semicircular notch (20) arranged opposite each other, and the contact wound By welding (22) and (23) to the outer surface,
A total of four parts are integrated into a hollow loop shape.

Loop space (24) of the turnbuckle member (14)
A beta pin (25) for preventing rotation, which is detachable from the opening of the loop space (24), is attached to the protruding end portion of the rear rod (13) that protrudes inward, and the pin (25) is attached to the rear rod (13). In the installed state, the pin (25) and the inner surface (26) of the loop space of the turnbuckle member (14) are in contact with each other, thereby preventing the rear rod (I3) from rotating relative to the turnbuckle member (14). It has been done.

It goes without saying that either one of the front rod (4) and the rear rod (13) and the turnbuckle member (14) is screwed with a left-hand thread.

In addition, the turnbuckle member (14) is connected to the loop space (24
), so even if this turnbuckle member (14) and the turnbuckle member (4 or 13) become rusty, a crowbar, for example, can be inserted into the loop space (24) to forcibly rotate it. be able to.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the check chain for a three-point link mechanism according to the present invention, in which Fig. 1 is a partially sectional plan view, Fig. 2 is a side view, Fig. 3 is an exploded perspective view of a turnbuckle member, and Fig. 4 is a partially sectional plan view.
The figure is a plan view of the rear part of the tiller. (1a)...Bracket, (2)...
・3-point link machine L (4), (13)...Connecting rod, (5)...Lower link, (14)
...Turnbuckle member, (24)...
・Loop space, <25)...Pin.

Claims (1)

[Claims] A connecting rod (4) is attached to the bracket (1a) on the side of the tractor main unit so that it cannot rotate relatively, and a three-point link mechanism (2)
) are attached to the lower links (5) of the turnbuckle members (14) respectively.
A check chain for a three-point linkage mechanism, in which the turnbuckle member (14) is formed into a hollow loop shape, and one connecting rod protrudes into the loop space (24). A locking pin (25) that is detachable from the opening of the loop space (24) is attached to the protruding end portion of (13), and when the pin is attached to the connecting rod (13), the pin (25) is attached to the connecting rod (13). The turnbuckle member (14) of the connecting rod (13) is brought into contact with the inner surface of the loop space of the turnbuckle member (14).
A check chain for a three-point link mechanism configured to prevent rotation.