JPS581378Y2 - Change guide for power agricultural machinery - Google Patents

Description

[Detailed description of the invention] This invention is a change in small power agricultural machines such as power tillers, in which the position of the steering handle (hereinafter referred to as the handle) relative to the machine body can be adjusted in direction according to the purpose of work. This is related to a change guide that guides and instructs the lever.When the handle is rotated, a check piece provided on the handle directly blocks a predetermined part of the change guide in accordance with the rotation position of the handle, causing the change lever to move backward. It is formed in such a way that it is impossible to insert it into the high-speed stage.
This objective is to provide a change guide that is accurate and easy to operate in order to ensure safe travel during work by improving the conventional seed stage that achieves the purpose by restraining the displacement of the change lever itself. It is.

Next, the configuration of this invention will be explained based on the illustrated embodiment.A change arm 2a is fixed to a lever support 2 that swings back and forth around a support shaft 1 provided in a transmission case. If the lower part of the upright portion 4a of the change lever 4 is inserted into the bush 3 and the change lever 4 is swung back and forth as described above, the forward shifter arm 7 and the reverse shifter arm 8 are fixed. These members are formed so that the change arm 2a engages and disengages from the respective engagement recesses to perform a selection operation.

Then, a spring 6 is inserted into the inner hole 3a provided in the bushing 3 above the collar 5 fixed to the lower end of the upright portion 4a,
A spline boss 4b formed on the upright portion 4a is formed to fit into a spline hole 3b provided in the bushing 3 under the force of the spring 6, and in this fitted state, the change lever 4 is rotated around its axis. When the shifter arm 7 for forward movement or the shift arm 8 for reverse movement which is engaged at this time performs a shift operation, a predetermined speed change operation is performed.

Moreover, if the engine lever 4 in the fitted state is pulled toward the handle along its axial direction against the spring 6, the spline boss 4b will escape from the spline hole 3b, thereby causing the change The lever 4 is formed so as to be rotatable around its axis.

As shown in FIG. 1, a plate-shaped change guide 10 with a ■-shaped guide groove 9 is formed, and the handle is rotatable in a horizontal plane with respect to the machine body.

The rotation base 1 approaches the lower surface of the rotation base 11a of the dollar 11.
For example, the change guide 10 is attached to the upper surface of the belt cover 12 while positioning the change guide 10 outside the outer periphery of the belt cover 1a.

Then, a guide part 13a formed on the upper part of the guide arm 13 whose lower end is fixed to the change arm 2a is inserted into the guide groove 9 of the change guide 10, and this guide part 13a is made to protrude upward from the change guide 10. The change lever 4 is moved to the support shaft 1 so as to move the guide portion 13a to the forward 1st speed position 14, the forward 2nd speed position 15, the reverse 1st speed position 16, and the reverse 2nd speed position 17, which are formed at the rear end of the switch 9.
If the rotation is made around the
On the outer periphery of the handlebar 11, there is protruded a check piece 18 in the shape of an even rear arc that blocks the second reverse gear position 17 of the change guide 10 at the position of the handle 11 shown by the solid line in FIG. A protruding restraining piece 19 is also provided on the outer circumferential edge of the rotating base 11a that extends from about 1800 degrees from the handle 11.
When the rotation is adjusted to the position shown by the two-dot chain line in Fig. 1, the forward second gear position 15, that is, the reverse second gear position with respect to the new handle position, is changed to the position shown by the two-dot chain line in the same figure. restraining piece 1
Make sure 9 is blocked.

Since the change guide according to this invention is constructed as described above, the handle 11 can be moved to the position shown by the solid line in FIG. If this is done, the restraining piece 18 provided on the handlebar 11 will block the second reverse gear position 17 even if the handlebar 11 is adjusted slightly to the left or right from the position shown above, and the handlebar 11 will be rotated approximately 1800 times. Then, the change lever 4 follows suit.If the engagement between the C-spline hole 3b and the spline boss 4b is changed and it is shifted by 1800 turns, the check lever provided on the handle 11 will move backward 2 with respect to the handle position after this rotation.
This will block the high speed position.

In other words, when the steering wheel is turned as described above, it is necessary to disable high-speed running backwards in the direction in which the steering wheel has been turned in order to ensure safe driving.
This idea is designed to directly block a predetermined part of the change guide with the handle itself equipped with a check piece, in pursuit of accurate operation, and as mentioned above, these switching operations are also extremely easy. This made it possible to do so.

In particular, in this invention, the high-speed backward movement position can be blocked by the check piece 18 or 19 even when the handle 11 is turned within 180 degrees, so the handle 11 can be tilted to form an angle with the aircraft body. This invention has an extremely wide range of applications because it can reliably prevent the change lever 4 from moving to the reverse high-speed position when performing work on a platform.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the vicinity of the attachment part of the change guide according to this invention, and FIG. 2 is a cross-sectional view of FIG. 1. Description of symbols, 1... Support shaft, 2... Lever support, 2a... Change arm, 3...
...button, 4...change lever, 3b
...Spline hole, 3a...Inner hole, 4
a... Standing part, 4b... Spline boss, 5... Collar, 6... Spring, 7.
...Forward shifter arm, 8...Reverse shifter arm, 9...Guide groove, 10...
...Change guide, 11...Handle,
11a...Rotating base, 12...Belt cover, 13...Guide arm, 13a...
...Guide section, 14...Forward 1st speed position, 15.
...Forward 2nd speed position, 16...Reverse 1st speed position, 17...Reverse 2nd speed position, 18, 19...
...Restraint piece.

Claims (1)

[Scope of utility model registration request] In a power agricultural machine in which a handle 11 is formed on the machine body so that its turning position can be freely adjusted around its rotation base 11a, a change arm 2a that engages with a shifter arm and a single guide arm 13 are connected to a change lever 4. A restraining piece 18 or 19 formed on the rotation base 1'1a and extending into the guide groove 9 of the change guide 10 that guides and instructs the speed change operation.
A change guide for a power agricultural machine, characterized in that the guide groove 9 is configured to close a high-speed position in the reverse direction of the guide groove 9 at a turning position of the handle 11.