JPH0333206Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a connecting link in a three-point linkage device for an agricultural tractor (hereinafter referred to as a tractor). The conventional connection link has the disadvantage that it takes time to connect an attachment such as a working machine. That is, when connecting attachments, the attachment center of the connection link must be accurately aligned with the center of the connection pin of the attachment, and the horizontal direction can be easily adjusted by slightly moving the tractor forward and backward;
In the vertical direction, adjustments must be made by manually moving the attachment up and down due to the swinging of the connecting link, and the connection work requires time and effort.

Therefore, in view of the above circumstances, the present invention has been improved so that the connecting link can be easily connected to the attachment, and can be used as a three-point link device with good connection workability, or as a pair of connecting links, that is, as a single connecting link. The purpose is to detachably attach a guide to one end of the connection link so as to sandwich the connection pin of the attachment, and to lock the attachment connection pin on the upper surface of the guide. achieved by.

Hereinafter, the present invention will be explained in detail based on an embodiment and with reference to the attached drawings.As shown in Fig. 1, the connection pin of attachment 1 (the one shown in this embodiment is an example of a working machine for fertilization and seeding) 2 is fixed with the pin end protruding to both left and right sides of the mounting arm 3, and a connecting link 4 (in this embodiment, a simple connection example is used as a connection example) is connected to the fixed pin 2 in the direction of arrow A. Therefore, only the left-hand link is shown, and the right-hand link is symmetrical with the left-hand link.), and as shown in FIG. The connecting pin 2 of the attachment 1 fixed to the left mounting arm 3 on the upper surface 7 is locked in the left protrusion 8 of the arm 3, and at this time, the pin 2 is locked in the right protrusion 9 of the attachment arm 3. The center of the pin 2 is aligned with the center of the connection hole 10 of the link body 5 in the vertical direction so that the left protrusion 8
Since the relationship between the pin 2 and the upper surface 7 of the guide 6 is determined, the connection hole 10 can be easily aligned with the pin 2 by slight movement of the tractor back and forth.
From this state, the attachment 1 can be attached to the connection link 4 without much effort by inserting the pin 2 into the connection hole 10 while swinging the connection link 4 in the horizontal direction as shown by the arrow B. In this way, the attachment 1 is attached to the right link in the same manner, and the attachment 1 shown in Fig. 2 is
It is a front view showing a state in which the conventional support link 11 and the steady rest link 12 are attached to the connection link 4 according to the present invention, and the connection hole 13 at the right end of the link body 5 is shown.
The connection link 4 is attached to the tractor at the time of installation, and the connection link 4 is swung up and down via the support link 11, and the left protrusion 8 (not shown) of the connection pin 2 of the attachment 1 is attached to the upper surface 7 of the guide 6. For the right side link, the right protrusion 14 of the connecting pin 2'
It is for locking. After attaching the left and right connecting links to the attachment 1, the tension of the steady rest links 12 is adjusted on the left and right sides, respectively.

As shown below, swing the connecting link 4 to lock one end of the connecting pin 2 integrated with the attachment 1 on the upper surface of the guide 6, and by slight movement in the front and back direction, connect the connecting hole 10.
The attachment 1 can be easily attached to the connecting link 4 by aligning the center of the pin 2 with the center of the pin 2 (the same applies to the right link), and in mechanized agricultural work, the time and effort required for attaching and detaching the attachment 1 can be saved. Savings plays a large role and contributes to efficiency and labor saving of the agricultural work.

[Brief explanation of the drawing]

Figure 1 is a diagram of the connection link according to the present invention when the left link is inserted into the attachment, Figure 2 is a front view of the connection link in use, and Figure 3 is the second
A partially cutaway plan view of the figure is shown. In the figure, 1 is the attachment, 2 is the connection pin,
3 is the mounting arm, 4 is the connection link, 5 is the link body, 6 is the guide, 7 is the top surface, 8 is the left side protrusion,
9 is a right side protrusion, 10 is a connection hole, 11 is a support link, 12 is a steady rest link, 13 is a connection hole, 14
is the protrusion on the right side.

Claims (1)

[Scope of utility model registration request] A guide is provided on one end of a connecting link in a three-point linkage device of an agricultural tractor in an L-shape in plan view and protrudes outward, and one end of an attachment arm of the agricultural tractor is provided protruding left and right on the upper surface of the guide. A connecting link in a three-point link device, wherein a connecting hole for inserting a connecting pin is provided at one end of the connecting link at a position corresponding to the other connecting pin when one of the connecting pins is placed.