JP6313368B2 - High branch saw - Google Patents

Description

The field of manual cutting tools used in forestry, landscaping, home gardens, etc. that require high branch cutting

In the cutting of tree branches over several meters, large-scale work is required that requires crane trucks for high-altitude work. This is effective when the tree is located in a position where the car can be placed next to it, such as tree-cutting a roadside tree. There is no choice but to rely on. If you want to cut a branch at the tip that the craftsman cannot reach, you can only use a saw attached to the tip of a long fence from the ground. However, due to the length of the long bush and the weight of the saw at the tip, it is impossible to cut branches that are more than 5m high. If you can't use a crane truck or a craftsman to cut a tree branch with a diameter of about 10cm at a height of about 10m, or if you can't use a base such as a ladder with a slope on the ground It is no exaggeration to say that there are no manual tools available at this time. The present invention is a manual tool capable of dealing with branches at higher positions than can be handled with so-called high-branching scissors or high-branching saws.

Japanese Patent Application Laid-Open No. 2000-236748 “Saw for cutting high branches with a rope” This is to drive a saw attached to a long hook with a rope, but there is a limit in the length of the hook. Japanese Patent Laid-Open No. 2007-244356 “Takabori-saw saw” This is a device in which a saw attached to a long hook is pressed against an object, but there is a limit in the length of the hook.

Commercially available high branch scissors can cut branches up to 3 cm in diameter at a maximum height of 4 m, but we want to cut branches of 10-20 cm in diameter at higher heights. Assuming a tree on the slope, a manual tool for this felling will be realized in situations where the work position cannot be raised, such as using a crane truck, and even a skipper cannot use it.

Fix the support frame 1 on the opposite side (root side) of the branch to be cut off. A seesaw body 3 that moves around the shaft 2 attached to the fixed frame is attached, and the saw 4 is held on the seesaw body 3 via the free rotation shaft 6 of the holding frame 5. The seesaw body 3 is operated with ropes 7, 7 'extending from the ground at both ends thereof. The holding frame 5 that holds and holds the saw has an arm for applying sawing pressure to the felled branches, and a rope 8 extends toward the ground at the tip. When felling, while applying tension with the rope 8, hold the ropes 7 and 7 'in both hands and give a seesaw motion to move the saw. Next, a method for fixing the support frame 1 will be described. The shape of the support frame 1 is that the ropes 9 and 9 'attached to both ends of the cutting plate curved according to the felling branch diameter are respectively turned from the opposite side of the branches and hung down on the ground, and the ends of the ropes are pulled. Lift the tool to the position of the branch and fix the rope at the appropriate angle. A weight can be used to fix the rope. Also, a weight having an appropriate weight can be used for the rope 8 that applies the saw pressure. The weight attached to the ground end of the rope 8 moves up and down according to the seesaw movement, but the amplitude of the vertical movement can be reduced by adjusting the position of the saw holding frame on the arm (the position just below the seesaw rotation axis is good). By using these weights, this tool can be operated by one person in principle. After cutting off the branches, you can remove the weights of ropes 9 and 9 'and gently lower the tool to the ground. In order to turn the ropes 9 and 9 'to the higher branches first, attach the tip of the two ropes to a light and strong string like a fishing line and throw the string with a small weight. It is easy to turn around in the way. Even in the case of a branch with a height exceeding 20 m, it is not difficult to lift the tip of a light string up to that point. In FIG. 1, the ropes 7 and 7 'for performing the seesaw motion are located directly under the branches. However, for safety reasons, it is desirable to avoid the positions directly below the branches, and this position can be freely selected if space on the ground is allowed.

The height of the felled branches can be increased as much as the length of the required rope is extended, and for safety reasons, 4m, which was impossible in the past, was only restricted due to the height of the cut surface being visible. It is also possible to cut branches that are more than.

A front view (left) and an elevation view (right) of a scene where a high-pruning saw is attached to a felled branch. A support frame 1 is fixed to the branch via opposing ropes 9 and 9 'attached to both ends of the hitting plate. A movable seesaw body 3 is attached around a shaft 2 attached to the support frame 1, and a commercially available saw 4 is supported on the seesaw body 3 via a bearing 6 of the holding frame 5. The seesaw body 3 is operated to perform a seesaw motion with ropes 7, 7 'extending from the ground at both ends. The saw holding frame 5 has an arm on the lower side, and a rope 8 attached to the tip thereof can be pulled from the ground to apply pressure to the saw. Logging is done by holding the ropes 7 and 7 'in both hands on the ground and giving a seesaw movement. The tool body is lifted by pulling the ropes 9 and 9 'to the position of the branch, and is fixed by fixing the rope. It is a photograph of the work which cuts a branch with a diameter of about 10cm, which is 10m in height, using this tool described as an application example.

As shown in FIG. 2, it was successfully used to cut a horizontal branch with a diameter of about 10 cm at a height of 10 m. Here, using a commercially available 24cm blade saw, two 20m long ropes are used to fix the support frame, and a 10m thin 10m long rope to apply pressure to the saw and two ropes for seesaw movement. One rope was used. To fix the support frame, two ropes were bundled near the ground and a weight of about 10 kg was attached. The weight of pressure applied to the saw was 4 kg. In the example of cutting performed several times, the branch was broken by its own weight in a state where the cutting progressed to about one third of the diameter, and the branch hanging at the bark portion could not be separated. In order to keep the cut surface clean, it is better to cut the bark directly below. This may or may not be easy depending on the length of the rope and the scaffolding conditions on the ground, but this does not diminish the value of the tool.

In the example introduced in the embodiment, the branches of trees growing on the slopes of the backyard oka are cut down. It can be done. Because it is a manual tool that can be procured at low cost, it can be used in ordinary homes.

In situations where pruning of trees is required, such as forestry, landscaping, and environmental improvement projects, it is possible to cut high branches that were previously considered difficult with less capital investment.

1 Support frame
2 Seesaw shaft
3 Seesaw
4 saw body
5 saw retaining frame
6 Free rotation axis
7 Seesaw rope
8 saw pressure rope
9 Support frame fixing rope

Claims (1)

The two ropes tied to the upper ends of the Y-shaped support frame are hung so as to cross over the cut branches alternately and pulled from the ground, so that the Y-shaped portion is pressed and fixed to the cut branches. A seesaw body having a rotating shaft passed through a bearing provided below the support frame and provided with a seesaw motion by two different ropes is provided with a different bearing. A commercially available saw blade holding frame is attached, the seesaw motion is changed to reciprocating motion, and the saw blade pressure from the tension of the fifth rope is generated.