JPS589012B2 - Checking device for change lever in power agricultural machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for moving a change lever in a small power agricultural machine such as a tiller to a rear gear position when traveling in reverse, in which the position of a steering handle relative to the machine body can be adjusted in rotation according to the purpose of work. The present invention proposes a restraining device that prevents the input operation of the vehicle to ensure driving safety when reversing.

This work is performed by adjusting the direction of the steering handle diagonally with respect to the aircraft, but the conventional change lever restraint device prevents the gear from changing to reverse high gear when the steering handle is tilted in this way. The structure made it impossible to control operations.

Therefore, in this invention, a change lever that can rotate and change the direction of the handle part is pivotally attached to a support shaft, and by swinging the change lever around this support shaft, the change arm can be moved forward or backward. In a change lever device formed to engage with any of the reverse change bosses, a cam provided on the change lever moves the check plate to the reverse change boss in the neutral position when the change lever is operated in the reverse direction. When engaged, it is constructed so that it lies within the shift operation trajectory to the reverse high-speed gear, and regardless of the direction of the steering wheel, high-speed reverse operation is always prevented, allowing for safe work such as shifting. It has been devised so that it can be done.

The specific structure will be explained based on one embodiment shown in the drawings.A bush 4 to which a change arm 3 is fixed is attached to a lever support 2 pivotally connected to a support shaft 1, and a spline hole 4a and a round hole 4b are attached to the bush 4. The spline boss 5b formed at the middle part of the upright part 5a of the change lever 5 is inserted into the spline hole 4a, and the tension spring 6 is wound around the lower part of the upright part 5a inserted into the round hole 4b. Then, insert the upper part of the collar 7 attached to the lower end of the upright part 5a into the round hole 4b, and pull up the change lever 5 to make the spline boss 5b escape from the spline hole 4a. The handle part 5c is configured to be able to change the direction by rotating around the shaft 5a, and a change boss 8 for forward movement and a change boss 9 for reverse movement are arranged vertically, and a change lever is arranged around the spindle 1. When the handle portion 5c of 5 is rotated downward or upward, the change arm 3 engages with the change boss 8 for forward movement or the change boss 9 for reverse movement, respectively, so that the support shaft 1
This is based on a change lever device configured in such a way that shifting the change lever 5 along the line shifts the gear to a low gear or a rear gear, and is a forward shift where the rotating tip is in the neutral position. A check plate 10 is pivotally supported by a shaft 12 protruding from a receiving plate 11 so as to be able to engage and disengage from the boss 8 or reverse change boss 9, and the base of a rectangular cam 13 is attached to the upright portion 5a. 13 should be parallel to the handle portion 5c.

Then, an engagement rod 14 is formed by gently bending a bar from near the center to which a bush 14a is fixed.
a into the hole 1 of the check plate 10 while rotatably inserting the
0a, a stopper 16 is provided protruding from the receiving plate 11 below the check plate 10, and both ends of the torque spring 17 wound around the rotating base of the check plate 10 are connected to the stopper 16. and the side edges of the check plate 10 to urge the check plate 10 to always rotate downward, and
When the steering handle 19 and change lever 5 are projected toward the rear of the aircraft body 18 as shown by the solid line in the figure, the cam 13 comes off the upper end of the engagement rod 14 as shown by the solid line in FIG. The rotating tip of the restraining plate 10 that has come into contact with the stopper 16 engages with the reverse change boss 9, and the steering handle 19 engages with the reverse change boss 9 as shown by the two-dot chain line in FIG.
and when the change lever 5 is turned to a position where it projects forward of the fuselage 18, the cam 13 is located above the engagement rod 14, and as the change lever 5 is pushed down, the engagement rod 14 is rotated. is pushed down by the cam 13, so the tip of the check plate 10 rotates upward and engages with the change boss 8 for forward movement located above, that is, the change boss 8 for reverse movement in the posture after turning. As described above, the change boss 9 for moving backward in the attitude shown by the solid line in FIG. Although it is possible to perform a reverse low gear shift operation by moving to the opposite side of the page of the same figure,
A reverse high gear shift operation performed by moving toward the front side from the page is suppressed.

Although not shown in the drawings, the check plate 10 may be rotated up and down in accordance with the orientation of the cam 13 as described above, for example, by connecting the cam 13 and the check plate 10 with a spring. .

As described above, the change lever restraining device according to the present invention includes the change lever 5, which allows the direction of the handle portion 5c to be rotated, which is pivotally attached to the support shaft 1, and the change lever is mounted around the support shaft 1. In the change lever device, the change arm 3 is formed so as to engage with either a forward or reverse change boss by swinging the change lever 5.
0 is configured so that when the change lever is operated in the reverse direction, it engages with the reverse change boss in the neutral position and is within the shift operation trajectory to the reverse high speed gear, so Traveling will definitely be blocked,
In particular, in this invention, the cam 13 for pressing the restraint plate 10 is provided on the side of the change lever 5, so that high-speed traveling when reversing is possible regardless of the orientation of the steering handle 19 with respect to the aircraft body. Therefore, there is an advantage that this high-speed backward running can be reliably prevented even in soil cultivation work in which the steering handle 19 is used diagonally with respect to the aircraft body.

[Brief explanation of the drawing]

FIG. 1 is a side view of a power agricultural machine to which a change lever check device according to the present invention is applied, and FIG. 2 is a front view of the same check device. Explanation of symbols, 1... Support shaft, 2... Lever support, 3...
...Change arm, 4...Bush, 4a...Spline hole, 4b...Round hole, 5...Change lever, 5a...Upstanding part, 5b...Spline boss, 5c...Handle part, 6...
...Tension spring, 7...Color, 8,9...Change boss,
10... Check plate, 11... Reception plate, 12... Shaft, 1
3...Cam, 14...Engagement rod, 14a...Bush, 15
...Bolt 16...Stopper, 17...Torque spring,
18... Airframe, 19... Steering handle.

Claims (1)

[Claims] 1. A change lever 5 that allows the rotation of the direction of the handle portion 5c to be changed is pivotally attached to the spindle 1, and by swinging the change lever 5 around the spindle 1, the change arm 3 is moved forward. Alternatively, in a change lever device formed to engage with any change boss for reverse movement, the check plate 1 is moved by the cam 13 provided on the change lever 5.
0 is configured such that when the change lever is operated in the reverse direction, the change lever is engaged with a reverse change boss at a neutral position so as to be within the shift operation trajectory to a high reverse gear. Lever restraint device.