JPH0125563Y2 - - Google Patents

Description

[Detailed description of the invention] This invention eliminates manual erroneous operation of the speed change lever that moves the pruning machine up and down, and also makes it possible to easily switch the speed change lever from the neutral position to the up position. This relates to a locking device.

Conventionally, a driving wheel and an idler wheel are attached to an arc-shaped main frame and a sub-frame, respectively, and these support the trunk, and the driving wheel is driven by a prime mover to climb up the trunk in a spiral manner. , a self-lifting pruning machine that cuts branches in the middle with an equipped chainsaw is known.

By the way, the speed change lever that moves this type of pruning machine up and down operates in conjunction with reverse rotation rather than forward rotation, so in order to ensure this operation, a locking plate was not provided to guide and lock it. . Therefore, it was easy to manually change the rotation between up, neutral, and down, but it also made it difficult to determine the neutral position, so it was easy to set the gear lever to the neutral position by mistake. There were problems with safety, such as erroneous operation in the ascending or descending position.

Therefore, this invention provides a locking plate that can ensure manual switching of the gear shift lever to the neutral position, and also enables one-touch switching from the neutral position to the ascending position where pruning begins. The above-mentioned problem has been solved by providing a gear lever locking device for a pruning machine in which a locking plate can be automatically retracted by a switching operation.

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

Figures 1 and 2 are a plan view and a front view of this pruning machine, and this pruning machine has an arc-shaped main frame 1 and a sub-frame 2, one end of which is pivotally connected with a pin 3 or the like, and the other end It is made into a circular shape by being pulled by a spring 4. Drive wheels 5, idle wheels 6, etc. are attached to the main frame 1 and the sub frame 2, respectively, and the trunk 7 is supported by these.

The power of the prime mover 8 is transmitted to the drive wheels 5 in the transmission box 9, and is also transmitted to the chain saw 10 which is provided upward so as to be in contact with the trunk 7.
The signal is transmitted from the input shaft 11 to the input shaft 11.

3 and 4 show a transmission structure in which power is transmitted from the prime mover 8 to the driving wheels 5... and the chain saw 10. The driving shaft (shaft) 12 is connected via a centrifugal clutch 13 to a sprocket, gears, The speed is suitably reduced by a worm, etc., and the shafts 14 and 1
5, the drive wheel 5 via the transmission path 17 such as the shaft 16
... is transmitted to the output shaft 18.

A forward/reverse switching mechanism 19 is installed on the shaft 16, and a mechanical timer 20 for setting a rising distance is installed further downstream of the shaft 16.

The forward/reverse switching mechanism 19 includes two gears 21 and a sprocket 2 to which opposite rotational force is transmitted from the shaft 15.
2 is loosely fitted, and a clutch 23 that slides through a spline fit with the shaft 16 is fitted between the two 21 and 22, and engagement pieces 24 and 25 formed on both sides of the clutch 23 engage the gear 21. Sprocket 2
A corresponding engagement piece 2 formed on the opposite side surface of 2
By engaging and disengaging 4' and 25, it becomes forward/reverse or neutral.

The mechanical timer 20 is provided with a worm wheel 26 that is decelerated further downstream from the shaft 16, and a number of holes 27 are formed on the side surface of the worm wheel 26, and pins 28 are inserted into the holes 27. The fork 29 linked to the clutch 23 is rotated to operate the forward/reverse switching mechanism 19. Also, fork 2
Reference numeral 9 has a gear shift lever 31 on an operating shaft 30 for operating the fork 29, which can be rotated to ascend V, neutral N, and descend D so that it can be operated manually.
is fixed and extended outside mission box 9.

On the other hand, the fork 29 is provided with an appropriate interlocking piece so as to integrally interlock with the fork 29, and the actuation piece is fixed to the actuation shaft 30, and these interlocking pieces and the actuation piece are mutually connected. It is said to be in a pivoted state that can be linked to.

Therefore, when manually operating the fork 29, the operating shaft 30 is rotated by operating the speed change lever 31, and the interlocking piece is interlocked via the operating piece fixed to the operating shaft 30. As a result, the fork 29 interlocked with this interlocking piece is activated.

Incidentally, in this invention, a locking plate 32 is attached to the transmission box 9 near the speed change lever 31.

That is, the upper end of the support shaft 34 is fixed to the lower surface of the end of the locking plate support piece 33 fixed to the upper surface of the mission box 9, and the side end fitting portion of the locking plate 32 is rotatably rotated around the support shaft 34. They fit together, and a spring 35 is interposed between the locking plate 32 and the support piece 33. At this time, the locking plate 32 is rotated counterclockwise in plan view from the locking position (solid line in FIGS. 4 and 5) to lock the shift lever 31 in the neutral N position, and is released. The fulcrum (support shaft 34) of the spring 35 is in the retracted position (dashed line in FIGS. 4 and 5).
It is configured so that it can be rotated and retracted by crossing over, and
On the other side of the locking plate 32, a locking plate 32 has a horizontal portion 36a and an inclined portion 36b forming a generally triangular shape capable of locking the gear shift lever 31 in the neutral N position when the locking plate 32 is in the locking position. A groove 36 is carved. As a result, the shift lever 31 locked in the locking groove 36 is in a locked state in which it cannot be switched by the horizontal portion 36a in the direction of the downward downward D position, while it is in an inclined state in the upward direction of the upward V position. Part 36
b is rubbed up, the locking plate 32 is forcibly rotated until the spring 35 passes over the fulcrum, and the position is automatically switched to the retracted position, making it possible to perform a one-touch switching operation (see Fig. 5). On the other hand, when attempting to move the shift lever 31, which has been prevented from descending D and is in the locked state, to descend D, the locking plate 32 in the locked position is manually rotated in the direction of the arrow shown in the figure. By doing so, the shift lever 31 is released from the locking plate 32, and the locked state is released, allowing it to freely move downward D.

As is clear from the above explanation of the configuration, according to this invention, when the machine is fixed, the locking plate 32
By switching the shift lever 31 to the locking position, the neutral N position can be easily determined, and the shift lever 31 can be reliably locked in the neutral N position. Operation errors such as incomplete switching to the neutral N position are eliminated, and safety can be further improved.

In addition, when the machine is attached to the trunk 7 and pruning work begins, the shift lever 31 can be switched from the neutral N position of the locking plate 32 in the locked position to the ascending V position with a single touch, making the switching operation easy. What's more, workers can quickly leave the machine to a safe location.

Furthermore, this one-touch switching operation moves the locking plate 32 to the retracted position, so various excellent effects can be expected, such as being able to switch the speed change lever 31 from any height with the operating rod during pruning work.

[Brief explanation of the drawing]

Figures 1 and 2 are plan views showing a self-elevating pruning machine;
A front view, FIG. 3 is an exploded cross-sectional view showing the gear shift lever locking device according to the invention attached to a transmission box with a built-in transmission path, and FIG. 5 is a perspective view showing the operating state of the locking device. be. FIG. 4 is a plan sectional view showing the locking device. Code, 5...driving wheel, 6...idling wheel, 7...
Trunk, 8... Prime mover, 19... Forward/reverse switching mechanism, 17
...Transmission system path, 31...Speed lever, 32...Lock plate.

Claims (1)

[Scope of utility model registration request] The power of the prime mover 8 is transmitted through the transmission path 17 to the driving wheels 5 among the driving wheels 5 and idle wheels 6 that are in contact with the periphery of the trunk 7, and further transmitted to the driving wheels 5 through the transmission path 17.
By activating the forward/reverse switching mechanism 19 built into the trunk 7, manual rotation switching is possible between ascending V, neutral N, and descending D in the gear lever locking device of the pruning machine that moves up and down with respect to the trunk 7. A locking plate 32 is provided in a substantially crossed state with respect to the speed change lever 31,
This locking plate 32 is rotatably fitted with its side end fitting portion around a support shaft 34 fixed to the end of a locking plate support piece 33 fixedly disposed near the speed change lever 31. At the same time, the support shaft 34
The locking plate 32 and the locking plate support piece 3
A spring 35 interposed between the locking plate 3 and the locking plate 3
2 is biased toward the shift lever 31 at the fulcrum of the support shaft 34, respectively, into the locking position and the retracted position, and furthermore, the side portion of the locking plate 32 is locked against the speed change lever 31. The department has
It is noted that a locking groove 36 having a generally triangular shape is formed, which can lock the gear shift lever 31 in the neutral N position, and includes a horizontal portion 36a that can prevent the downward movement D and an inclined portion 36b that allows the upward movement V. Features a gear lever locking device for pruning machines.