JPH036200Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a structure for pulling down and lowering a pruning machine.

(b) Conventional technology Conventionally, a main body frame is provided with a driving wheel, an auxiliary frame is provided with a driven wheel, and each frame is biased and connected in a direction relatively close to each other, and the trunk is connected by the driving wheel and the driven wheel. There was a pruning machine configured to cut branches using a cutting section connected to the main body frame while moving up the trunk by pinching and rotating each wheel.

(c) Problems to be solved by the invention However, the pull-down structure of the above-mentioned pruning machine has the upper end of the roller arm pivoted on the main body frame, and the roller pivoted on the lower end of the roller arm. The rollers were brought into pressure contact with the trunk surface by the rotating operation, and the reaction force was used to separate the main body frame from the trunk surface, and when the drive wheels separated from the trunk surface, the machine was pulled down by its own weight.
If there is a protrusion such as a bump on the surface of the stem, the roller may get caught on the protrusion, causing the machine to stop pulling down, which is inconvenient.

(d) Means for solving the problem In this invention, inclined driving wheels are provided above and below the main frame to drive the climb up to the trunk, and caster type driven wheels are provided on the auxiliary frame, and each frame is mutually connected. The trunk is pressed by the driving wheel and the driven wheel, and the trunk is spirally ascended by the rotation of each wheel, and the cutting part connected to the main body frame separates the branch. In a pruning machine configured to perform cutting, the lower end of a roller arm, which has an arm length longer than the distance between the frame and the trunk surface, is pivoted via a horizontal shaft on the main body frame and is mounted in an upward direction. A roller is connected to the upper end of the roller arm, the arm is interlocked with a rotary sliding cam having an uneven cam surface, and a pull-down rope is connected to a lever of the rotary sliding cam. By sliding the rotating sliding cam toward the center of the trunk, the roller can be pressed against the trunk, and by configuring the drive wheel to move away from the trunk, the driving wheel can be moved toward the trunk. It is an object of the present invention to provide a structure for lowering the pruning machine, which is constructed so that the lowering operation of the pruning machine can be performed by the driven wheels and rollers without interfering with the pruning machine.

(e) Function This machine spirally ascends the trunk by rotating the drive wheel installed in an inclined position, and cuts the branches of the trunk at the cutting section until the machine reaches a predetermined height. When ascending, stopping pruning work, and lowering the machine,
When the pull-down rope is pulled, the rotating and sliding cam rotates as the lever rotates downward, and at the same time, the rotating and sliding cam slides toward the center of the trunk due to the action of the uneven cam surface, and the left and right roller arms are activated by the tension spring. The rollers connected to the upper ends of the left and right roller arms are pressed against the trunk, and this pressing force causes the body frame to move away from the trunk and drive. The ring separates from the trunk surface. Then, the machine descends along the trunk using its own weight using the driven wheels and rollers. At this time, the tilted drive wheels act as a brake, allowing the machine to gradually descend down the trunk without falling too quickly.

In addition, since the roller is provided at the upper end of the roller arm, even if the protrusion on the trunk surface comes into contact with the roller, the roller will avoid the protrusion by rotating the roller arm outward. , it does not get caught on the protrusion, allowing smooth pulling and lowering work.

(f) Effects According to the present invention, the lower end of the roller arm, which is formed to have a longer arm length than the distance between the frame and the trunk surface, is pivoted to the main body frame via a horizontal axis,
A roller connected to the upper end of the roller arm, which is mounted facing upward, is constructed so that it can press against the trunk, and when the roller is pressed in a state where it is easily adapted, the main body frame is separated from the trunk via the roller arm. ,
The driving wheels are configured to move away from the trunk, and the driven wheels and rollers are configured to lower the pruning machine, so even if the rollers get caught on a protrusion such as a bump on the trunk surface, the rollers will not move. The protrusion is avoided through the rotation of the roller arm, and the machine can be lowered and lowered without any trouble and in a stable state.

In addition, the present invention has a roller connected to the upper end of the roller arm, the roller is interlocked with a rotating sliding cam having an uneven cam surface, and the pulling rope is further connected with a lever of the rotating sliding cam. By sliding the same rotating sliding cam toward the center of the trunk,
Since the roller is constructed so that it can be pressed against the trunk, the roller arm can be pressed against the trunk by a cam action. Therefore, the operator can lower the pruning machine by simply pulling the lowering rope lightly. This can definitely be done.

(G) Example The example of the present invention will be explained in detail based on the drawings.
A indicates a pruning machine, and the pruning machine A has four driving wheels 1 at the top, bottom, left and right positions around the main body frame a.
is arranged in an inclined state, the engine 2 is arranged on the back of the main body frame a, the cutting part 3 is arranged on the upper part of the main body frame a, and the pulling mechanism 4 is arranged in the center of the main body a.
At the same time, an auxiliary frame 5 is detachably attached to the main body frame a while being biased in a direction opposite to the main frame a. Further, the auxiliary frame 5 is provided with caster type driven wheels 6 at upper and lower positions around the periphery, so that the main frame a and the auxiliary frame 5 can be sandwiched around the trunk B in a surrounding manner. Support A to trunk B,
By driving the drive wheel 1, the machine A is moved spirally along the slope of the drive wheel 1 while raising the trunk B, and the cutting section 3 cuts the branch b of the trunk B,
After raising the machine A to a certain extent, the machine A is lowered by a lowering mechanism 4.

The structure of this pull-down mechanism 4 will be explained as follows.

That is, a horizontal shaft 7 is horizontally mounted on the main body frame a, and the lower ends of the left and right roller arms 8, each of which has a longer arm length than the distance s between the main body frame a and the surface of the trunk B, are pivoted to the horizontal shaft 7. A roller 9 to be pressed against the surface of the trunk B is mounted between the upper ends of the left and right roller arms 8, which are supported and mounted in an upward direction, and an arm pin 10 is mounted horizontally between the middle parts of the left and right roller arms 8. ing. In addition, a tension spring 1 for biasing is provided between the left and right roller arms 8 and a cam mounting base 11 to be described later.
2 is interposed.

In addition, a cam mount 11 is installed on the back of the main body frame a, and a cam guide shaft 13 is made to protrude horizontally from the center of the mount 11 toward the trunk B, and is fixed to the base end of the cam guide shaft 13. In addition to fitting the cam 14, the rotary sliding cam 1 is attached to the tip of the cam guide shaft 13.
I am wearing 5.

As shown in FIG. 4, uneven cam surfaces 16-1 and 16-2 are formed on the mutual contact surfaces of the fixed cam 14 and the rotating and sliding cam 15, respectively, and the rotating and sliding cam There is a lever 1 on the upper circumferential side of the cam 15.
7 is integrally provided in a protruding manner, and as the rotary sliding cam 15 is rotated by the downward rotation operation of the lever 17, the cam surfaces 16-1 and 16-2 slide, and the rotary sliding cam 15 is rotated. It is constructed so that it can slide toward the center of the trunk B.

Further, a rotary joint 18 is connected to the inner diameter tip of the rotary sliding cam 15 so as to be rotatable only.

15-1 is a small-diameter stepped portion provided at the inner diameter tip of the rotary sliding cam 15, and 18-1 is a large-diameter stepped portion provided on the operating outer periphery of the rotary joint 18. The rotary joint 18 is connected to the rotary sliding cam 15 by abutting the small diameter stepped portion 15-1 and the large diameter stepped portion 18-1. Further, the arm pin 10 is inserted through a connecting body 24 connected to the rotary joint 18,
By sliding the rotary sliding cam 15 toward the trunk B side, the left and right roller arms 8 are tilted toward the trunk B side, and the rollers 9 are pressed against the surface of the trunk B, and the main body frame a is moved toward the trunk B.
By moving the drive wheel 1 away from the surface, the drive wheel 1 becomes the trunk B.
It is configured so that it is deviated from the 24-1
is a horizontal pin that connects the rotary joint 18 and the connecting body 24.

Further, the base end of a pull-down rope 19 is connected to the tip of the lever 17, and the rope 19 is long so that when the machine A reaches a predetermined height of the trunk B,
The tip of the rope 19 is placed within reach of the operator.

In the figure, 20 is a guide plate, 21 is a chainsaw,
22 is a support body, and 23 is a lifting arm.

The embodiment of the present invention is constructed as described above, and when the drive wheel 1 is driven by the driving force of the engine 2, the machine A moves up the trunk B in a spiral manner according to the inclination of the drive wheel 1. Then, the chain saw 21 rotates to cut the branch b of the trunk B, and this machine A
When the machine A rises to a predetermined height and you want to stop pruning and lower the machine A, pull the pull-down rope 19, and the rotary and sliding cam 15 rotates as the lever 17 rotates downward, and at the same time it rotates. The sliding cam 15 slides toward the center of the trunk B, and the left and right roller arms 8 rotate toward the trunk B around the pivot at the lower end against the tension spring 12, and are mounted in an upward direction. The roller 9 provided between the upper ends of the left and right roller arms 8 is the trunk B.
Due to the pressure contact force, the main body frame a moves in the direction away from the trunk B, and the drive wheel 1 moves toward the trunk B.
This machine A is separated from the surface, and this machine A has a driven wheel 6.
and the rollers 9, it naturally descends along the trunk B under its own weight.

At this time, the tilted drive wheel 1 acts as a brake, so the machine A does not fall down rapidly, and by pulling down the pulling rope 19 several times,
It is possible to gradually lower trunk B.

In addition, since the roller 9 is disposed at the upper end of the roller arm 8 that is mounted facing upward, even if the roller 9 comes into contact with a protrusion on the surface of the trunk B, the roller 9
The roller arm 8 adapts smoothly by outward rotation of the roller arm 8, avoids the protrusion, does not get caught in the protrusion, and can be pulled down and lowered smoothly.

According to the present invention, the lower end of the roller arm, which is formed to have an arm longer than the distance between the main body frame and the trunk surface, is pivoted via a horizontal shaft, and the roller arm mounted upward is A roller connected to the upper end is configured so that it can be pressed against the trunk, and when the roller is pressed in a flexible state, the main body frame separates from the trunk via the roller arm, and the drive wheel separates from the trunk. The structure is such that the driven wheel and roller can lower the pruning machine, so even if the roller gets caught on a protrusion such as a bump on the surface of the trunk, the roller will prevent the rotation of the roller arm. This has the effect of avoiding the protrusion and allowing the machine to be lowered and lowered without any hindrance in a stable manner.

In addition, the present invention has a roller connected to the upper end of the roller arm, the arm is interlocked with a rotating sliding cam having an uneven cam surface, and the pull-down rope is further connected with the lever of the rotating sliding cam. By sliding the rotating sliding cam toward the center of the trunk, the roller can be brought into pressure contact with the trunk, so the roller arm can be brought into pressure contact with the trunk by the cam action. Therefore, the operator can reliably lower the pruning machine by simply pulling the lowering rope lightly.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway overall front view of an embodiment of the present invention;
2 is a plan view of the same, FIG. 3 is a front view of the main part, FIG. 4 is a vertical sectional side view of the main part, and FIGS. 5A and 5B are explanatory views of the state of use. A: pruning machine, a: main frame, B: trunk,
b: Branch, 1: Drive wheel, 3: Cutting section, 5: Auxiliary frame, 6: Caster type driven wheel, 7: Horizontal shaft, 8:
Roller arm, 9: roller, 15: rotating sliding cam, 19: pulling down rope.

Claims (1)

[Claims for Utility Model Registration] Inclined driving wheels 1 for driving up to the trunk B are provided above and below the main body frame a, and caster type driven wheels 6 are provided on the auxiliary frame 5, and each frame a, 5
are connected to each other by urging them toward each other, and drive wheels 1
This pruning machine is configured to pinch the trunk B by the and driven wheels 6, and cut the branches with the cutting part 3 connected to the main body frame a while ascending the trunk B in a spiral shape by the rotation of each wheel. In A, the lower end of a roller arm 8, whose arm length is longer than the distance s between the frame a and the surface of the trunk B, is pivoted to the main body frame a via a horizontal shaft 7, and is mounted in an upward direction. A roller 9 is connected to the upper end of the roller arm 8, and the arm 8 is interlocked with a rotary sliding cam 15 having an uneven cam surface. 1
7 and slide the rotary sliding cam 15 toward the center of the trunk B, so that the roller 9 can be freely pressed against the trunk B, and the drive wheel 1 is connected to the trunk B.
Lowering of the pruning machine A is configured so that the driven wheels 6 and rollers 9 can lower the pruning machine A while the driving wheels 1 do not interfere with the trunk B by separating from the trunk B. structure.