JPH04131017A - Internal-combustion type branch lopper - Google Patents

Abstract

PURPOSE:To lightly lop a branch by attaching either of blades in scissors to the tip of a piston in an internal-combustion engine, attaching the other blade of the scissors to the body, nipping the branch of a tree between the aforementioned blades and moving the piston. CONSTITUTION:A fuel-air mixture of a fuel with air is burned in a combustion chamber 8 formed from walls of a cylinder 1, a piston 3 and a cylinder head 2 in a body 9 to move the piston. Thereby, a branch 12 of a tree is nipped with either blade (10a) of scissors attached to the tip of a piston and the other blade (10a) of the scissors attached to the body and lopped.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a portable branch cutter [Background of the Invention] Conventionally, when cutting tree branches in gardens, streets, etc., manual scissors, Alternatively, you are using an electric wave cutter that connects an electric wire to a power line, or a rechargeable wave cutter that uses a rechargeable battery. Among these machines, manual machines have the problem of restricting work due to worker fatigue, and electric wave cutters have the problem that the power cord gets in the way and requires a power outlet nearby. There is. Also, in the case of rechargeable batteries, there is a problem in that it takes time to recharge and requires a power outlet nearby.

Further, the working time possible with one charge is about 30 minutes at most.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a branch cutter that is convenient to use.

[Summary of the invention]

The present invention focuses on the high pressure generated when fuel in a fuel cylinder is combusted, and uses the high pressure to operate scissors to cut branches.

[Embodiments of the invention]

1 to 4 are examples of the present invention. Figure 1 shows the preparatory stage for nail driving. In the figure, 1 is a cylinder, 2 is a cylinder head, and 3 is a piston, and the space surrounded by these forms a combustion chamber 8. 4.7 is a scavenging hole drilled in the body 9, and 56 is a scavenging hole drilled in the cylinder 1. When the fan (not shown) outside the body 9 starts operating, air flows in the order of arrows a, b, c, and d.
The gas in the combustion chamber 8 is replaced with fresh air. A scissor (1) 10a is attached to the tip of the piston 3 via a pin 22. Furthermore, scissors (2) 10b are fixed to the legs 11 that are integral with the cylinder 1. Scissors (1) 10a and scissors (2) 10b are connected by pins 23.

The pins 23 and 22 are connected to the objects they penetrate (piston driver 19, scissors (1) 10a, scissors (2) 10b).
) has a structure that allows it to rotate freely. At the preparation stage, the branch 12 is sandwiched between the scissors (1) 10a and the scissors (2) 10b.

Figure 2 shows the combustion chamber closed for driving nails. The combustion chamber can be closed by pressing the entire branch cutter against the branch 12. This causes the foot 11 and the cylinder 1 to move upward relative to the body 9, causing the scavenging hole 5.
6 can be closed. With the combustion chamber closed in this manner, fuel from a fuel cylinder (not shown) is injected into the combustion chamber through the fuel injection holes 13a, 13b, and 13c of the nozzle, and is ignited by the spark plug 14 and combusted. As a result, the piston moves downward, and the scissors (]-
) lOa rotates and begins cutting branch 12.

Figure 3 shows that the piston descends to some extent due to combustion, and branch 12
This shows the state where the cutting has started.

FIG. 4 shows the piston at its lowest position. When the piston passes through the hole 17 provided in the cylinder, the pressure chamber 18
High-pressure gas due to combustion accumulates in the cylinder 1, which compresses the spring 20 and moves the cylinder 1 downward to open the cylinder's scavenging hole 5.
6 is opened to exhaust the combustion gas in the combustion chamber and bring the inside of the combustion chamber to atmospheric pressure.

As a result, the pressure in the pressure chamber 18 returns to atmospheric pressure, the spring 20 returns to its original length, the cylinder moves upwards, and the scavenging hole 5.6 of the cylinder closes again.

The temperature of the gas in the combustion chamber is higher than room temperature as a result of combustion, but it is cooled by the surrounding room temperature air and its pressure is lower than atmospheric pressure. As a result, the atmospheric pressure acting on the bottom of the piston causes the piston to move upward, returning to the position at the start of combustion.

In the embodiment of the invention, a so-called thermal vacuum is used to create a negative pressure in the combustion chamber when the piston is returned after cutting the branch, but instead of this, a spring is compressed when the piston is lowered, and The piston may be returned to its original position.

〔Effect of the invention〕

According to the present invention, branches in gardens, streets, etc. can be cut just by attaching a fuel cylinder, and unlike conventional methods, it can be operated by connecting a power cord from a power line, or in the case of a rechargeable type, it can be operated with one charge. It is possible to perform branch cutting work without worrying about the time restriction of about 30 minutes at most.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and is a longitudinal sectional view showing a standby state before branch cutting. Figure 2' shows the time of ignition,
The figure shows a state in which the piston descends due to combustion and cuts the branch, and Fig. 4 is a vertical cross-sectional view showing the state in which cutting is completed. In the figures, 1 is the cylinder, 2 is the cylinder head 3 is the piston, 4.7 is a scavenging hole in the body, 5.6 is a scavenging hole in the cylinder, 8 is a combustion chamber, 9 is a body, 10
a, 10 b are scissors,] 1 is the cylinder foot, 12 is the branch, 13a, 13b, 13c is the fuel injection nozzle hole, 14 is the spark plug, 15 is the orifice grid, 16 is the orifice grid hole, 17 is the cylinder and pressure Hole connecting room, 18
19 is a pressure chamber, 19 is a shaft connecting the piston and scissors, 20. 21 is a spring; 22. 23 is a pin.

Claims (1)

[Claims] 1. One side of the scissors attached to the tip of the piston by burning a mixture of fuel and air in the combustion chamber formed by the walls of the cylinder, piston, and cylinder head in the body, and moving the piston. An internal combustion type branch cutter that cuts tree branches by sandwiching the branch between the blade and the other blade of scissors attached to the body. 2. The internal combustion type branch cutter according to claim 1, wherein the scavenging fan is disposed inside the combustion chamber. 3. An internal combustion type branch cutter according to claim 1, wherein the scavenging fan is located outside the combustion chamber. 4. An internal combustion type branch cutter according to claim 2 or claim 3, characterized in that the fuel contains butane, propane, or a mixture of both as a main component.