JPH0139121Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a top link fixing device for a three-point link mechanism that is installed on a traveling machine such as an agricultural tractor.

Generally, this type of three-point linkage mechanism connects the working machine to the traveling machine body using two lower links and one top link so that it can move up and down, but when the working machine is removed, The top link will hang downward when the tip side is free, so if you drive on the road or in the field in this state, the top link will swing in response to the vibration of the machine and will move downwards where the top link is attached. It cannot be allowed to collide with components such as the cover body for the power take-off shaft provided and damage these components, causing a harsh noise or causing the screw rod of the top link to loosen, come off, and fall out. There were some shortcomings. Therefore, it is possible to fix the free top link to the aircraft side, but in the past, fixing the top link had to be done manually by the operator, who had to get off the aircraft each time, which was troublesome. It is actually difficult to check whether the top link is fixed from the driver's seat, and if you forget to fix it, you have to stop the aircraft and have the operator get off the aircraft and check each time. It had the disadvantage of poor workability and operability.

The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation, and the top link, whose tip end is free when the work equipment is removed, is operated by a control lever that can be operated from the driver's seat. The top link can be automatically fixed in the upward movement position with the top link facing upward, allowing the worker to fix the top link while sitting in the driver's seat without having to get off the machine each time.
You can easily and reliably check whether the top link is fixed, etc.
The object of the present invention is to provide a top link fixing device for a three-point linkage mechanism that can significantly improve workability and operability, and in particular,
The top link of the three-point linkage mechanism is configured to move upward in conjunction with the operation of a control lever that can be operated from the driver's seat, and the top link that has moved upward is engaged and fixed with a fixture provided on the aircraft body side. It is characterized by the fact that it is made to do so.

Next, the present invention will be explained in more detail based on an embodiment shown in the drawings. In the drawing, 1 is a running body of an agricultural tractor;
A three-point linkage mechanism 2 is provided at the rear of the vehicle.
The three-point link mechanism 2 is composed of one top link 3 and two lower links (not shown), and the base end of the top link 3 is attached to a bracket 4 fixed to the rear of the fuselage 1. It is pivotally connected to the shaft via a ball joint 4a so as to be able to swing vertically and horizontally within a certain range.

Reference numeral 5 denotes an operating lever in which a boss portion 5a at the base end is rotatably supported on a shaft 4b protruding from the bracket 4, and the operating lever 5 is connected to the shaft 4b at a position where it can be operated from the driver's seat 6. Using the driver's seat 6 as a fulcrum, it can be rotated from a standing position on one side of the rear side of the driver's seat 6 (solid line position in Figure 1) to a reclining position lying forward (position shown in phantom line in the figure). Reference numerals 7 and 7a are stoppers for positioning the rotating operating lever 5 in an upright position or a collapsed position, and are provided on an appropriate member such as the bonnet 8 on the side where the operating lever 5 is installed. Also 5
Reference numeral b denotes a return device that always urges the operating lever 5 toward the standing position, and when the operating lever 5 that has been operated to the inverted position is released, the operating lever 5 automatically returns to the upright position. There is. The support arm 9 protruding from the boss portion 5a of the operating lever 5 has a concave portion 9a bent at its tip to support the middle portion of the top link 3 from below when the operating lever 5 is in the upright position. However, this recessed portion 9a is elongated in the left-right direction so that the top link 3, which swings within a certain range in the left-right direction, can be supported at any position. Then, in conjunction with rotating the operating lever 5 from the upright position to the collapsed position, the top link 3 is moved upward, and the fixing tool 10 (described later) provided on the rear surface of the center cover 11 on the rear side of the fuselage 1 is placed in the upright position. It is becoming fixed.

Bracket 1 which is a component of the fixture 10
The front edge of 2 is fixed to the back surface of the center cover 11, and the rear edge side is cut out with a mountain-shaped guide surface 13, 13a having an engaging part 14 into which the top link 3 can be inserted. has been done. The guide surfaces 13 and 13a guide the upwardly moved top link 3 toward the engaging portion 14 side. An operating body 16 is provided on one guide surface 13 side.
is rotatably supported around a fulcrum shaft 15 on the intermediate side. The operating body 16 rotates within a range in which a knob 17 provided at its base end moves along an arcuate guide hole 12a formed in the bracket 12, but the knob 17 rotates within the range where the knob 17 moves along the arc-shaped guide hole 12a formed in the bracket 12. When the actuating body 16 is positioned on the side (solid line state in FIG. 3), the tip of the actuating body 16 protrudes toward the other guide surface 13a and engages the engaging portion 1.
When the top link 3 inserted into the top link 4 is locked so that it does not fall, and the knob 17 is located at the lower end (as shown by the imaginary line in Fig. 3), the tip of the operating body 16 rotates upward. It is inserted into the bracket 12 and can enter and exit the engaging portion 14 of the top link 3. Furthermore, the actuating body 16 is always urged by the torsion machine 18 so as to be in a protruding state. As described above, when the top link 3 that moves upward in response to the operation of the operating lever 5 comes into contact with the tip of the operating body 16, the actuating body 16 resists the torsion bomb 18 due to the pushing up action from the top link 3. and rotates upward, and the top link 3 engages the engaging part 1.
4, the pushing up action by the top link 3 ceases and the top link 3 returns to its protruding state, engaging and fixing the top link 3 in an upright position slightly inclined toward the rear.

In the figure, 19 is a lift arm, 20 is a mission case, and 21 is a running wheel 22, which is a fixture for supporting and fixing the fulcrum shaft 15 to the bracket 12.

In the embodiment of the present invention configured as described above, when the work machine is removed, the top link 3 is supported by the support arm 9 with the tip end free. When a person, sitting in the driver's seat 6, grasps the operating lever 5 in the standing position and falls forward against the projectile 5b, the top link 3 rotates upward and moves toward the guide surface 13 or 1.
3a and comes into contact with the tip of the actuating body 16. Then, when the operating lever 5 is further lowered, the top link 3 is moved to the operating body 16 in the protruding state.
is pushed up and inserted into the engaging part 14, and when the top link 3 almost reaches the deep part of the engaging part 14, the actuating body 1
6 is no longer pushed up by the top link 3, and the actuating body 16 automatically returns to the protruding state due to the biasing force of the torsion machine 18, and the top link 3 is placed in a standing position facing upward and visible from the driver's seat. It will be engaged and fixed.

In this way, in the case of the present invention, the top link 3
There is no need for the operator to get off the machine and fix it each time, and it can be easily and reliably carried out by simply operating the control lever 5 while sitting in the driver's seat 6. Moreover, since the top link 3 is fixed in a standing position facing upward by the one-touch operation, the operator sitting in the driver's seat 6 can check whether the top link 3 is fixed by simply looking back. It can be checked immediately, and there is no need to get off the aircraft and check it every time as in the past. Therefore, the work of fixing the top link 3 and the work of confirming the fixation can be easily performed even while the aircraft is running. Moreover, in this embodiment, the engaged and fixed top link 3 is connected to the actuating body 1.
Since the structure is such that the fixation is not released unless the top link 6 rotates against the load of the top link 3, there is no possibility that the fixation will be released inadvertently due to vibrations of the aircraft body or the like, resulting in drooping.

The fixed top link 3 can be released by operating the knob 17 toward the lower end of the guide hole 12a.

In summary, the present invention configures the top link of a three-point linkage mechanism to move upward in conjunction with the operation of a control lever that can be operated from the driver's seat.
Since the above-mentioned upwardly moved top link is engaged and fixed with a fixing device provided on the machine body side, the top link, whose tip end is free when the work equipment is removed, can be used by the operator while sitting in the driver's seat. It can be automatically fixed to the aircraft side with a simple one-touch operation using the operating lever. Moreover, since the top link is fixed in the upright position, the operator can quickly and easily check whether the top link is fixed while sitting in the driver's seat. Not only can the top link be confirmed to be fixed even when the aircraft is running, but the top link can also be fixed if the user forgets to do so, thereby significantly improving workability and operability.

[Brief explanation of the drawing]

The drawing shows an embodiment of the top link fixing device of the three-point link mechanism according to the present invention,
Figure 1 is a side view of the main part, Figure 2 is a back view of the main part, and Figure 3 is a rear view of the main part.
The figure is an enlarged rear view of the main part with a part cut away, and FIG. 4 is an enlarged side view of the main part with a part cut away. In the figure, 2 is a three-point link mechanism, 3 is a top link, 5 is an operating lever, 6 is a driver's seat, and 10 is a fixture.

Claims (1)

[Scope of utility model registration request] The top link of the three-point linkage mechanism is configured to move upward in conjunction with the operation of a control lever that can be operated from the driver's seat, and the top link that has moved upward is engaged and fixed with a fixture provided on the aircraft side. A top link fixing device of a three-point linkage mechanism, characterized in that it is configured to.