JPH0219019Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pruning machine used for cutting tree branches.

When producing timber by growing trees through afforestation,
To create knot-free wood, it is often necessary to prune the lower branches of the tree. Traditionally, pruning work at high places was carried out by people climbing on ladders, but recently it has become more common to use pruning machines, and one of the applicants has already completed the work as shown in Figure 1. proposed a pruning machine (see Utility Model Application No. 57-132359 (Utility Model Application No. 59-31844)). This pruning machine consists of a handle 1, a slide pipe 2 fixed to the upper end of the handle 1, a slide rod 3 inserted into the slide pipe 2 so as to be able to slide vertically, and a slide rod 3 fixed to the upper end of the slide rod 3. a pair of clamping plates 4, an upper blade 5 fixed between the upper parts of the clamping plates 4, and a lower blade 6 rotatably attached between the clamping plates 4 slightly below the upper blade 5.
, an interlocking rod 7 whose one end is rotatably attached to the lower blade 6, a pull rod 10 whose one end is rotatably attached to the slide pipe 2, and the interlocking rod 7 and the draw rod 10 whose both ends are rotatably attached to the slide pipe 2. It consists of a lever bar 9 which is rotatably attached to the pivoting end of the lever and whose portion closer to the interlocking lever 7 is rotatably attached between the clamping plates 4.
Then, by hooking the upper blade 5 on a tree branch and pulling down the handle 1 straight, the slide pipe 2 also descends and the pull bar 10 is pulled downward, so the lever bar 9 becomes the fulcrum for the clamping plate 4. As a result, the lower blade 6 is pushed upward via the interlocking rod 7, and the upper and lower blades 5 and 6 cut off the branch. In the case of this pruning machine, the leverage ratio of the lever bar 9 (the ratio of the distance from the fulcrum 8 to the clamping plate 4 to the fulcrum 11 to the pull bar 10 and the distance from the fulcrum 8 to the fulcrum 12 to the interlocking rod 7) is large. , a large cutting force can be obtained by pulling down the handle 1 with a small force. Therefore, pruning can be done with a small force, reducing worker fatigue and improving work efficiency. Furthermore, branches can be easily trimmed by simply pulling the handle 1 straight down, and the tree will not be damaged. Although this pruning machine has the above-mentioned excellent effects, it also has the following drawbacks. That is, in order to open and close the upper and lower blades 5 and 6 to cut off branches, the lower blade 6 is
It is necessary to rotate the lever bar 9 to increase it to a certain extent, and for this purpose, it is necessary to increase the distance from the fulcrum 8 to the fulcrum 12 of the lever bar 9 to a certain extent. Furthermore, as explained above, in order to obtain a large cutting force with a small force, it is necessary to increase the leverage of the lever bar 9 to some extent. In order to meet these two requirements, the pry bar 9 will inevitably become longer, which will increase the weight of the pruning machine, and furthermore, the pry bar 9 will protrude laterally, making it difficult for the trees to become densely packed. This makes pruning work in such narrow spaces relatively difficult.

The purpose of this invention is to improve the above-mentioned pruning machine, and to provide a pruning machine that can easily perform pruning with a small force, is lightweight, and can easily perform pruning even in narrow spaces.

The branching machine according to this invention consists of a handle, a rod-shaped moving body attached to the top of the handle so that it can move up and down, an upper blade fixed to the top of the moving body, and a rotating part slightly below the upper blade of the moving body. a lower blade that is movably attached, a first link that has one end that is rotatably attached to the lower blade, a second link that has one end that is rotatably attached to the upper part of the handle, and both ends of the link. A third link is rotatably attached to the first and second links and crosses the movable body, and a third link is rotatably attached to the movable body at one end and the other end is rotatably attached to the movable body. The fourth link is rotatably attached to the part near the first link.
The movable body is provided with a guide for regulating the movement of the third link.

In addition, in this specification, upper and lower refer to the usage state shown in the drawings.

An embodiment of this invention will be described below with reference to FIGS. 2 to 5.

The pruning machine includes a handle 20, a bar-shaped moving body 21 attached to the upper part of the handle 20 so as to be movable up and down, an upper blade 22 fixed to the upper part of the moving body 21, and the moving body 21.
A lower blade 23 is rotatably attached slightly below the upper blade 22, a first link 24 has one end rotatably attached to the lower blade 23, and one end rotates to the upper part of the handle 20. Second link 25 movably mounted
and both ends are first and second links 24, 25.
The movable body 21 is rotatably attached to the rotating end of the
One end of the third link 26 intersects with the moving body 21, and the other end is rotatably attached to the portion of the third link 26 near the first link 24. A guide 28 is provided on the movable body 21 to restrict the movement of the third link 26.

The handle 20 has a vertical rod shape, and a vertical guide pipe 29 is fixed to its upper end. And the second
The link 25 is attached to a bracket 30 fixed to the guide pipe 29 via a pin 31. The moving body 21 consists of a vertical moving rod 32 and a pair of blade support plates 33 fixed to the upper end of the moving rod 32, and the moving rod 32 is inserted into a guide pipe 29 so as to be vertically slidable.

The upper blade 22 is held between the upper ends of the support plate 33, and a downward blade is formed at the lower part of the upper blade 22 that projects laterally from the support plate 33. One end of the lower blade 23 is attached between the support plates 33 via a pin 34, and an upward blade corresponding to the upper blade 22 is formed at the upper part of the lower blade 23 that projects laterally from the support plate 33. ing. A disc-shaped stopper 35 whose position is adjustable is fixed between the support plates 33 between the upper and lower blades 22 and 23 to regulate the upper end position of the lower blade 23. A pin 36 protruding from one side is fixed at a position slightly eccentric from the center of the stopper 35, and a male thread 37 is attached to the tip of this pin 36.
is formed. Then, a pin 36 is rotatably fitted into a hole drilled in the support plate 33 on one side.
The stopper 35
is fixed.

The fourth link 27 is attached via a pin 38 between the support plates 33 slightly below the lower blade 23. The guide 28 is formed by cutting the support plate 33 on one side slightly below the pin 38 into a substantially triangular shape. first link 2
4 consists of a turnbuckle so that its length can be adjusted, and is attached via a pin 40 to a bracket 39 formed integrally with the lower part of the lower blade 23. The third link 26 is movably inserted between the lower portions of the support plate 33, and pins 4 are attached to the first, second, and fourth links 24, 25, and 27, respectively.
1, 42, and 43. Third
The guide 2 of the support plate 33 is located at a portion of the link 26 that is slightly closer to the second link 25 than the fourth link 27.
A guide pin 44 in contact with 8 is fixed. Further, the fourth link 27 is bent into a step shape at one point in the middle so as not to interfere with the third link and the support plate 33.

A push cutting blade 45 is attached to the outer surface of the upper end of the support plate 33 on one side.
is fixed in an upwardly projecting manner, and an upwardly directed blade is formed at the top.

As shown in FIGS. 2 and 3, when you hold the handle 20 in your hand and stand up the pruning machine, the moving body 21
lowers to the lower end position by its own weight, and this lower blade 2
3 rotates to the lower end position, the upper and lower blades 22,
23 opens to the maximum.

When cutting off a tree branch, hold the tree branch between the upper and lower blades 22 and 23 in the open state as described above, hook the upper blade 22 onto this, and then pull the handle 20 straight down. good. When the handle 20 is pulled down, the guide pipe 29 also descends and the second link 25 is pulled downward, so that the third link 26 becomes the fourth link 27.
At the same time, the guide pin 44 moves along the guide 28 diagonally to the lower left in the figure. As a result, the fourth link 27 also rotates clockwise in the figure around the pin 38 between it and the support plate 33.
The pin 43 between the third link 26 and the fourth link 27 moves diagonally to the upper left in the figure. In this way, when the handle 20 is pulled down, the third link 26 and the fourth
The pin 43 between the links 27 moves diagonally to the upper left in the figure, and the third link 26 rotates clockwise in the figure around this pin 43, so the lower blade 23 moves to the upper left in the figure. 24 to the position shown in FIG. 4, and the upper and lower blades 2
2 and 23, the branch is cut off.

When the branch is cut off as described above, the moving object 2
Since the branch 1 descends under its own weight and returns to the state shown in FIGS. 2 and 3, the next branch can be cut off in the same manner as above.

The handle 20, that is, the guide pipe 29 is the movable body 21
When the fourth link 27 is moved up and down, the fourth link 27 rotates and the position of the pin 43 between it and the third link 26 changes.
Even if the distance to the pin 41 between the lower blade 23 and the lower blade 23 is made considerably smaller, the lower blade 23 can be rotated sufficiently. Therefore, even if the leverage ratio of the third link 26 is increased so that a large cutting force can be obtained with a small force, the third link 26 only needs to be short, and thereby the second link 25 is also shortened.

Further, small branches can be cut by the pushing cutting blade 45 without using the upper blade 22 and the lower blade 23.

When assembling the branch cutter or when polishing the cutting edges of the upper and lower blades 22 and 23, the first link 24
By adjusting the length of the lower blade 23, the degree of opening and closing of the lower blade 23 can be adjusted. You can adjust the condition.

According to the pruning machine of this invention, as described above, pruning can be easily performed with a small force. In addition, since the third link 26 is not directly attached to the movable body 21 but is attached to the movable body 21 via the fourth link 27, the lower blade 23 can be rotated to a certain extent and at the same time, a small force can be used to generate a large amount of force. Even if the leverage of the third link 26 is increased to obtain cutting force, the third
The link 26 can be short. Therefore, the second link 25 is also shortened, making the entire pruning machine lightweight, and the third link 26 does not protrude sideways, making it easy to use even in narrow spaces where trees are densely packed. Can do pruning.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional example, Fig. 2 is a front view showing an embodiment of this invention, Fig. 3 is an enlarged view of the main part of Fig. 2, and Fig. 4 shows a state different from Fig. 3. Third
FIG. 5 is an enlarged sectional view taken along line V-V in FIG. 4. 20...Handle, 21...Moving body, 22...Upper blade,
23... lower blade, 24... first link, 25...
Second link, 26...Third link, 27...
Fourth link, 28...Guide.

Claims (1)

[Claims for Utility Model Registration] (1) A handle 20, a bar-shaped movable body 21 attached to the upper part of the handle 20 so as to be movable up and down, an upper blade 22 fixed to the upper part of the movable body 21, and a movable body 21, a lower blade 23 rotatably attached slightly below the upper blade 22, a first link 24, one end of which is rotatably attached to the lower blade 23, and one end of which is connected to the handle 20.
The second link 25 is rotatably attached to the upper part of the
A third link 26 is rotatably attached to the rotating ends of the moving body 21 and intersects with the movable body 21; A fourth link 27 is rotatably attached to a portion of the link 26 near the first link 24.
A pruning machine is provided with a guide 28 for regulating the movement of a link 26. (2) The moving body 21 has an upward pushing cutting blade 4 at its upper end.
5. The pruning machine according to claim 1 of the utility model registration claim. (3) The pruning machine according to claim 1 or 2, wherein the movable body 21 is provided with a stopper 35 whose position is adjustable for regulating the upper end position of the lower blade 23. (4) The pruning machine according to any one of claims 1 to 3, wherein the first link 24 is a turnbuckle.