JPH0543606Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a hitch device for a power tiller that allows the wheel width to be freely adjusted without any problem.

(B) Prior Art A tiller is constructed so that its tilling section can be attached to and removed from the rear of the machine, and the tilling section is removed for use in operations other than tilling, such as trailer work. As this attachment/detachment mechanism, a so-called quick-hit method was often used, in which a hook that can be operated with a lever is provided on the machine side, and this hook is engaged and detached from a hitch pin provided on the tilling section side.

(c) Problems to be solved by the invention However, in such cases, due to restrictions such as the longitudinal length of the aircraft, these hitch devices were installed within the lateral projection plane of the wheels. Therefore, even if an attempt was made to move the wheel inward in order to attach some kind of work object to the outside of the wheel, the hitch device interfered and the user could not do so.

(d) Means to solve the problem Therefore, this invention provides a hook on the machine side that can be operated by rotating the lock lever, and uses a hitch mechanism that engages and disengages this hook with a hitch pin provided on the tilling section side. , in a hit device for a tiller in which the tilling section is attached to and detached from the main machine, the hit mechanism is installed outside the side projection plane of the wheel, and the rotation range of the lock lever is controlled by the hook being The above-mentioned problem was solved by setting it so that when it is engaged, it exits from the side projection plane, and when it disengages, it enters the side projection plane.

(E) Effect As a result, the rotational position of the lock lever when the hook engages with the hit pin is out of the side projection plane of the wheel, and when released, it is inside the projection plane. Therefore, when the tilling section is removed, this lock lever becomes an obstacle and prevents the wheel from moving inward from a certain position, but this does not happen when it is installed.

(F) Embodiments Hereinafter, specific embodiments of this invention will be described with reference to the drawings.

FIG. 1 is a side view of the hitch device and its surroundings of a tiller implementing this invention, FIG. 2 is a side view of the same main part, and FIG. 3 is a plan view of the main part.

The A side of the tiller is the chassis frame (not shown)
is supported by a pair of left and right wheels 1,
In addition, on the tilling section B side, a tilling case 3 is attached to the cultivation case 2, and a tilling shaft 4 is attached to this tilling case 3, and a working body 5 such as a claw is attached to this. .

Incidentally, the hitch mechanism 6 is used to attach and detach both A and B, and this mechanism is constructed as follows. That is, first, a hitch body 7 having an inverted U-shape in side view is installed at the center of the rear part of the machine A side, and a hitch board 8 is also installed behind this hitch body 7. Note that 9 is a connecting pin that is inserted through the hitch body 7, and 10 is a hitch metal fitting that receives a hitch pin 11 to be described later. On the other hand, a bracket 12 is stretched forward on both sides of the tilling case 3 on the tilling section B side, and the hit pins 11 described above are installed horizontally at the front upper and front lower parts of the bracket 12.

Next, a hook shaft 13 is horizontally supported on a hitch plate 8 near a rear part out of the side projection plane of the wheel 1, and a guide pin 14 is attached to one end of the hook shaft 13.
Similarly, a stopper pin 15 is provided to protrude laterally. A lock lever 1 is attached to the hook shaft 13.
6 is installed, so this lock lever 16
When rotated, both the guide pin 14 and the stopper pin 15 swing and rotate about the hook shaft 13. At this time, a trajectory along which the guide pin 14 passes through the hit plate 8 and swings is formed in the elongated hole 17 to serve as a guide for the guide pin 14. On the other hand, a hook 18 having a hook-shaped tip and capable of engaging with the hit pin 11 described above is provided, and the hook 18 is biased toward the hit pin 11 by a spring 19, and rotation beyond a certain level is restricted by the stopper pin 15 described above. At the same time, it is fitted onto the guide pin 14.

As a result, if the lock lever 16 is now rotated in the direction of arrow a in FIG. In order to maintain this standing posture, the stopper pin 15 described above acts). At this time, the tiller B can be attached to the machine A. That is, when the upper hitch pin 11 is dropped onto the hitch metal fitting 10, the lower hitch pin 11 rotates in the direction of arrow e in FIG. It stops. At this time, if the lock lever 16 is rotated in the direction of arrow b in FIG.
The hook 18 similarly rotates in the direction of arrow d to tighten the hit pin 11. In the above case, even when the lock lever 16 is rotated in the direction a in FIG. It's becoming like that.

Incidentally, in the above description, the hitch mechanism 6 except the lock lever 16 is installed so as to be out of the side projection plane S of the wheel 1 rearwardly. Furthermore, the rotation range of the lock lever 16 is
It is set so that it comes out of the side projection surface S of the wheel 1 when it engages with the hit pin 11, and enters the projection surface S when it disengages.

As a result, when the tiller B is removed from the machine A, the presence of the lock lever 16 becomes a hindrance and the wheel 1 cannot be moved inward beyond a certain range, but when it is attached, this problem disappears. .

FIG. 4 is a cross-sectional view showing an example of a tension clutch of such a tiller, and the pulley 20 is composed of two side plates 20a and 20b, of which one side plate 20a can be moved laterally. (However, the spring 21 is used to spring the spring 21.) At the same time, a bearing 22 is fitted to the bottom of the spring 21, and further,
The belt 23 is wound around the outside thereof. On the other hand, by approaching the outer circumferential side of the belt 23 to the pulley 20 side, the belt 23 is moved toward the bearing 20.
At the same time, it enters into the pulley 20, moves its movable side plate 20a, and moves away from the pulley 20, separating the belt 23 from the bearing 22, and by the action of the spring 21, the belt 23 Both side plates 20a, 20
A tension pulley 24 is provided to be clamped by b. As a result, when the tension pulley 24 is pressed against the belt 23, the belt 23 and the pulley 20 do not rotate together, but when the tension pulley 24 is released, the belt 23 and the pulley 20 rotate together due to the action of the spring 21. By adopting this method, it is possible to solve the problem of the belt and pulley running around, which has traditionally been a problem with this type of clutch mechanism.

(G) Effects of the invention Since this invention is as described above, the following effects can be expected.

That is, when the tiller B is attached to the machine A side, the lock mechanism 6 including the lock lever 16 is all located outside the lateral projection plane S of the wheel 1.
You can move as much as you like inside. Therefore, by doing this, you can not only adjust the balance and running width, but also move the wheel 1 inward,
It is also possible to attach some kind of work body (for example, a rotary) to the outer axle, thereby increasing the variety of work forms.

On the other hand, when the tilling section B is removed for trailer work or the like, the lock lever 16 is located within the side projection plane S of the wheel 1 and restricts the wheel 1 from moving inward beyond a certain range. Therefore, it will not happen that the wheel 1 is carelessly brought inward, causing the vehicle to lose its balance and fall.

[Brief explanation of the drawing]

Figure 1 is a side view of the hit device of a power cultivator in which this invention was implemented, Figure 2 is a side view of the main parts, Figure 3 is a plan view of the main parts, and Figure 4 is a tension clutch of a power tiller. It is a sectional view showing an example. Code, 1...wheel, 6...hitsch mechanism, 11...
...Hittip pin, 16...Lock lever, 18...
Hook, A... This machine, B... Cultivating section, S... Lateral projection of the wheel.

Claims (1)

[Scope of utility model registration request] Hook 1 that can be operated by rotating the lock lever 16
8 is installed on the A side of the machine, and this hook 18 is attached to the tilling section B.
In a tiller hit device in which the tiller B is attached to and detached from the main machine A by means of a hit mechanism 6 that engages and disengages from a hit pin 11 provided on the side, the hit mechanism 6 is attached to and detached from the side projection surface S of the wheel 1. In addition to being installed on the outside, the rotation range of the lock lever 16 is set so that when the hook 18 engages with the hit pin 11, it comes out of the side projection plane S, and when it disengages, it goes inside the side projection plane S. A hitch device for a tiller, characterized in that it is set so as to be inserted into the tiller.