JPS5814110Y2 - Back safety device in tiller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a back safety device for a tiller that prevents the machine body from inadvertently moving backward during rotary work.

In general, a tiller can be run with the machine body being shifted to three forward speeds and one reverse speed, and the rotary can be changed to two high and low speeds, and furthermore, these can be changed to two speeds. It has an auxiliary shift lever that allows for

By the way, in such power tillers, if the rotary rotates immediately when the travel gear shift lever is put into reverse, just as it does when traveling forward, serious accidents can occur if the operator accidentally operates the tiller during work. It was very dangerous.

Therefore, the present invention uses a rotary shift lever and an auxiliary shift lever, and by sliding the rotary/auxiliary shift lever, the auxiliary shift can be switched, and by rotating the lever, the rotary can be switched. In the tiller,
A connecting bar having a parallel portion extending parallel to the lever is fixed to the lever, and a concave groove is formed in the aircraft body so that the lever can be aligned with the reverse position of the travel gear lever guide groove only when the lever is in the rotary non-working position. and a back safety plate having an engaging groove that engages perpendicularly with the parallel portion of the connecting bar is configured to be pivotally mounted, thereby regulating the back plowing state regardless of the position of the sub-shift. The purpose of this invention is to provide a back safety device with

Embodiments of the present invention will be described below with reference to the drawings.

A gear change indicator plate 2 is provided at one end of the handlebar 1, and the gear change indicator plate 2 indicates forward first speed ■, second forward speed ■, and third forward speed ■.
, neutral N, and reverse R are formed with an H-shaped traveling gear shift lever guide groove 3.

A traveling speed change lever 5 passes through the guide groove 3, and one end of the lever 5 is connected to a speed change gear device with three forward speeds and one reverse speed.

Further, a through hole 6 is formed in the speed change instruction plate 2, and a rotary/auxiliary speed change lever 7 passes through the through hole 6.

The lever 7 has a guide bar 1 that engages with an H-shaped rotary/sub-shift lever guide groove 8 formed on the shift indicator plate 2.
0 is fixed, so that the lever 7 can slide in the front-rear direction and rotate in its front-rear position, and this sliding movement is applied to the switching device of the auxiliary transmission, and the rotational movement is applied to the rotary It is linked to high speed, low speed and neutral switching devices.

Further, pins 11 and 12 are fixed to the back surface of the speed change indicator plate 2, and the pin 11 engages with the round hole 13, and the pin 1
2 is guided into the elongated hole 15, so that the back safety plate 16 is pivotally attached to and supported by the shift indicator plate 2.

As shown in detail in FIGS. 2 and 3, the back safety plate 16 is formed with a bent tongue portion 18 having an engagement groove 17, and the groove 17 is provided with a rotary/auxiliary gear shift lever 7. A parallel portion 19a of an L-shaped connecting bar 19 fixed to the lever 7 and the lever 7 are engaged with each other so as to be orthogonal to each other.

Furthermore, the back safety plate 16 has a groove 20 that aligns with the reverse position R of the guide groove 3 only when the rotary gear is in the neutral position, round holes 21 and 22 that can engage with the pins 11 and 12, and a back plow. It has a mark 23 indicating deregulation.

The mark 23 is a window formed in the speed change display plate 2 when the round hole 21.22 of the back safety plate 16 is engaged with and supported by the pin 11.12 of the speed change display plate 2 and fixed at the back tilling restriction release position. Visually observed from 25.

Since the present invention has the above-mentioned configuration, the rotary/auxiliary transmission lever 7 is slid in the front and rear direction, and the parallel portion 19a of the connecting bar 19 is aligned with the lever 7 in either the high or low speed switching position of the auxiliary transmission. The engaging groove 17 extends parallel to the parallel part 19a and is perpendicular to the parallel part 19a by the bent tongue part 18.
is formed, so that the connecting bar 19 engages with the engagement groove 17 of the back safety plate 16 while maintaining a constant state.

Now, as shown in Figures 1 and 2, when the rotary/auxiliary gear shift lever 7 is in the neutral position where it is not rotating left or right and the rotary is not operating, the back safety plate has the concave groove 20. Since it is aligned with the backward movement position R of the guide groove 3, the traveling speed change lever 5 can be engaged in any position of the guide groove 3, and does not prevent the aircraft from moving backward.

Next, when the rotary/auxiliary gear shift lever I is rotated to the left or right along the guide groove 8 and the rotary is operated at high or low speed, the back safety plate 16 also engages the pin 11 via the connecting bar 19. Rotates either left or right around the center.

As a result, the concave groove 20 of the back safety plate 16, which has been aligned with the reverse position R of the guide groove 3, is shifted to the left or right, and the travel gear shift lever 5 can no longer engage with the reverse position R.

Furthermore, when the traveling speed change lever 5 is located at the reverse position R of the guide groove 3, the traveling speed change lever 5 also engages with the concave groove 20 of the back safety plate 16, so that the back safety plate 16 is rotated. unable to move.

For this reason, the rotary/auxiliary shift lever 7 is connected to the back safety plate 16 via the engagement groove 17 and the connection bar 19.
cannot rotate and cannot operate the rotary.

Next, when canceling the back tillage restriction, remove the round hole 13 and long hole 15 of the back safety plate 16 from the pin 11.12, and then insert the round hole 21.22 of the back safety plate into the pin 1 again.
By engaging 1.12, the back safety plate 16
is fixed to the shift indicator plate 2 at a position different from that mentioned above.

At this time, there is a mark 23 on the pack safety plate 160 in the window 25 opened in the gear shift indicator plate 2 indicating that the back tilling restriction has been lifted.
The position is t-.

In this position of the back safety plate 16, the connecting bar 19 does not engage with the engagement groove 17, and the groove 20 portion does not prevent the travel gear shift lever 5 from engaging in the reverse position R. The lever 7 and the traveling speed change lever 5 can each freely move along the guide groove 8.3, and back plowing is also possible.

As explained above, according to the present invention, in a tiller that has both a sub-shift lever and a rotary shift lever, the traveling shift lever 5 is moved to the reverse position R during rotary work, regardless of the position of the sub-shift. Since the rotary/auxiliary gear shift lever 7 does not enter the rotary working position while the machine is moving backward, the risk of accidentally performing backward plowing work is completely eliminated.

Further, since the parallel portion 19a of the connecting bar 19 extends parallel to the lever 7, and the engagement groove 17 is formed to be orthogonal to the parallel portion 19a, the lever 7 can be used to switch the sub-transmission. Even if the parallel part 1 of the connecting bar 19
The engagement state between the engagement groove 9a and the engagement groove 17 does not change, and the back safety plate 16 maintains a constant state without being displaced.

Furthermore, regardless of the rotation angle of the rotary/auxiliary gear shift lever 70, the position of the pin 11 and the relationship between the connecting bar 19 and the engagement groove 17 allow the back safety plate 16 to always move appropriately as a back safety. Quantity can be secured.

Further, the connecting bar 19 may be appropriately extended parallel to the lever 7, and at the same time, the engaging groove 1T may be formed by the bent tongue portion 18 so as to be orthogonal to the parallel portion 19a, and the structure is simple and can be manufactured at low cost.

Further, the back tilling restriction by the back safety plate 16 can be canceled by simply changing the engagement hole, and the operation and configuration are simple.

Further, since the cancellation of back plowing can be displayed near the reverse position R on the shift instruction plate 2, the operator can easily confirm the cancellation.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a back safety device according to the present invention, FIG. 2 is a sectional view taken along arrow A in FIG. 1, and FIG. 3 is a front view showing a back safety plate used in the device. 2... Airframe (speed change display board), 3... Traveling gear shift lever guide groove, 5... Traveling gear shift lever, 7... Rotary/auxiliary gear shift lever , 16...
...Back safety plate, 17...Engagement groove,
19... Connection bar, 19a... Parallel part, 20... Concave groove, 23... Mark, 2
5...Window, R...Reverse position.

Claims (3)

[Scope of utility model registration request] (1) In a tiller that has both a rotary gear shift lever and an auxiliary gear shift lever, and can switch the auxiliary gear by sliding the rotary/auxiliary gear lever, and switch the rotary by rotating the lever, A connecting bar having a parallel portion extending parallel to the lever is fixed to the lever, and a concave groove is formed in the aircraft body so that the lever can be aligned with the reverse position of the travel gear lever guide groove only when the lever is in the rotary non-working position. and a back safety plate having an engaging groove that engages perpendicularly with the parallel portion of the connecting bar, thereby preventing the rear plowing state from occurring regardless of the position of the sub-shift. Device. (2) The back safety plate does not interfere with the movement of the travel gear shift lever to the reverse position, and can also be fixed in the back plowing restriction release position where the connecting bar and the engagement groove are disengaged. The back safety device according to claim 1 of the utility model registration claim. (3) A window is formed on the fuselage near the reverse position of the guide groove, and a mark is provided on the back safety plate that can be seen through the window at the reverse tillage release position. Back safety device as described in section.