JPH0310827Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to pruning shears for trimming fruit trees and garden trees, and is particularly suitable for cutting relatively thick branches.

[Conventional technology]

In conventional pruning shears and pruning shears, the blades are opened and closed by directly operating grip portions formed at the base ends of a pair of pivoted blades, or grip handles attached to the base ends.

[Problem that the invention attempts to solve]

Conventional scissors have been modified in various ways to make them easier to use, such as having a spring interposed in the opening/closing direction of the blade. However, no matter which pruning shears or pruning shears were used, it was not possible to cut very thick branches. If you dare to cut it, it would require an extremely large amount of force, and it naturally had the disadvantage that the thickness of branches that could be cut was limited to relatively thin branches.

The object of the present invention is to provide pruning shears that can cut thick branches with as little force as possible compared to conventional pruning shears.

[Means for solving problems]

The pruning shears of the present invention consist of a pair of blades 1 and 2 and an arm 3 that are pivoted to be able to open and close freely, and a grip handle 13 that is attached to the base end of one of the blades 1 and attached to the base end of the arm 3. It consists of a gripping handle 14 that is

One blade body 1 to which the gripping handle 13 is attached has an arm 3 on the side of the pivoting position with the other blade body 2.
At the same time, the base end of the other blade body 2 is engaged with the intermediate position of the arm 3. Blade body 2
It is assumed that the engagement position of the arm 3 and the arm 3 slide (move). With the above configuration, the pair of blades 1 and 2 can be opened and closed by opening and closing the grip handles 13 and 14. Then, the position where the engagement position of the other blade body 2 and arm 3 has rotated is on the extension line connecting the pivoting position of the pair of blade bodies 1 and 2 and the pivoting position of one blade body 1 and arm 3. , so that the pair of blade bodies 1 and 2 are approximately at their maximum open position.

[Function] As shown in FIG. 1, the pruning shears according to the present invention are opened and closed using a grip handle 13 attached to the blade body 1 and a grip handle 14 attached to the arm 3.

As shown in Fig. 3, a shaft 4 to which the blade bodies 1 and 2 are attached
and the dimensions up to the engagement position of the blade 2 and arm 3.
When l ₁ is the dimension from the shaft 5 to the engagement position between the blade body 2 and the arm 3 as l ₂ , the force for operating the gripping handle acts on the blade body as a force proportional to l ₁ /l ₂ . Since l ₁ > l ₂ , a larger force is applied to the blade body compared to conventional pruning shears and pruning shears in which the gripping handles of a pair of blade bodies are directly operated.

The ratio of dimension l ₁ to dimension l ₂ changes depending on the rotating position of the arm, and as shown by the two-dot chain line in FIG. When , l ₁ /l ₂ becomes maximum. In other words, the maximum cutting force can be obtained at this time, and this is the
Since this is the almost maximum practical open position of the blade body 2, the maximum cutting force is exerted when cutting into relatively thick branches.

〔Example〕

Hereinafter, embodiments of the present invention will be explained based on the accompanying drawings.

The blade bodies 1 and 2 of the pruning shears shown in the drawings form a pair, and the blade body 1 is a receiving blade having a concave arc-shaped blade portion 1a, and a grip handle 13 is attached to the base end thereof.
On the other hand, the blade body 2 is a cutting blade having a convex arc-shaped blade portion 2a, and has a substantially V-shape as a whole, and the double blade bodies 1 and 2 are pivotally attached to each other by a shaft 4. That is, the blade body 1 has a hole 6 and the blade body 2 has a hole 8.
The blade bodies 1 and 2 are attached to each other by a shaft 4 that passes through the shaft 4.

Another hole 7 is bored in the blade 1, which is a receiving blade, on the side of the hole 6 where the blade 2 is pivoted. This hole 7 is for pivoting the tip of the arm 3. That is, a hole 11 is bored at the tip of the arm 3, and the shaft 5 is inserted through the hole 7 of the blade body 1 and the hole 11 of the arm 3 to be attached thereto. At this time, in order to prevent the arm 3 from interfering with the rotational movement of the blade body 2, a part of the blade body 1 is made thinner and the mounting surface of the arm is stepped lower, so that the surface of the attached arm 3 is lower than the blade body. It does not protrude from the sliding surface between the blade 1 and the blade 2. A gripping handle 13 is attached to the base end of the blade 1, which is a receiving blade, and another hole 10 is bored in the base end of the blade 2, which is a cutting blade.

On the other hand, the arm 3 has a generally bent shape in the opposite direction to the blade 2, and a gripping handle 14 is attached to the base end, and a length in the middle part thereof is for engaging the blade 2. A hole 12 is bored. Then, the shaft 9 is loosely passed through the hole 10 of the blade body 2 and the elongated hole 12 of the arm 3. Therefore, when the arm 3 is rotated about the shaft 5 by the grip handle 14, the blade body 2, which is engaged by the shaft 9, is rotated about the shaft 4. At this time, the engagement position of the shaft 9 and the arm is in the elongated hole 1.
2.

In order to slidably engage the base end of the blade body 2 with the arm 3, a combination of a groove and a protrusion may be used in addition to the combination of the elongated hole 12 and the shaft 9. Also, blade 1
2, and the blade body 1 and the arm 3, it is of course possible to use bobolts, nuts, pins, or any other method conventionally used as a pivoting means for scissors.

The positional relationship of the axes 4, 5 and 9 is such that the distance _l1 between the axes 4 and 9 is larger than the dimension _l2 which is the distance between the axes 5 and 9, that is, when the arm Any device that can move the blade using this principle will suffice. l ₃ is the distance between axes 4 and 5
is constant on the blade body 1.

In the present invention, the blade body 2 is rotated by the rotation of the arm 3, and the opening/closing angle of the blade body 2 relative to the opening/closing angle of the arm 3 is proportional to the ratio of angles α ₁ and α ₂ in Fig. 3. do. That is, the ratio of dimension l ₁ to dimension l ₂ , l ₁ /l ₂
By increasing , a large cutting force can be obtained with a small force, but for a large rotation angle of the arm,
The rotation angle of the blade becomes smaller. Therefore, the axis 4,
The positional relationship between 5 and 9 can be designed as appropriate depending on the size and purpose of the pruning shears. angles α ₁ and α ₂
The ratio of can be changed by changing the interaxial dimension l ₃ of shafts 4 and 5. Therefore, the sliding range of the engagement position between the blade body 2 and the arm 3 is made relatively large, and the holes 7 on the blade body 1 are provided in a plurality of places so that the user can change the pivot position. Good too.

Further, in the illustrated embodiment, the engagement position of the arm 3 changes with respect to the fixed position of the blade 2, but conversely, the engagement position of the blade 2 changes with respect to the fixed position of the arm 3. You can also do this.

[Effect of idea]

According to the pruning shears of the present invention, since the blade body can be rotated with a stronger force than that of conventional pruning shears, it is possible to easily cut even relatively thick branches.

Moreover, it has the advantage that it is extremely effective and can cut as easily as possible because a stronger force is applied at the initial stage of cutting when the greatest force is required.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the pruning shears of the present invention; FIG. 1 is a front view, FIG. 2 is an exploded perspective view with the gripping handle omitted, and FIGS. 3 and 4 are views with the gripping handle omitted. These are omitted front views, in which FIG. 3 shows the blade in a closed state, and FIG. 4 shows the blade in an open state. 1, 2...Blade body, 3...Arm, 4, 5, 9...
...Axis, 13, 14...Gripping handle.

Claims (1)

[Scope of utility model registration request] A pair of blade bodies 1, 2 and an arm 3 are pivotally attached to each other so that they can be opened and closed, and a grip handle 13 is attached to the base end of one of the blade bodies 1, and a grip handle 14 is attached to the base end of the arm 3. The tip of an arm 3 is pivoted to one blade body 1 to which the gripping handle 13 is attached on the side of the pivot attachment position with the other blade body 2, and the other blade body 1 is attached to the other blade body 2 at an intermediate position of the arm 3. The base end of the blade body 2 is slidably engaged, and the pair of blade bodies 1 and 2 are opened and closed by opening and closing operations of the grip handle 13 attached to the blade body 1 and the grip handle 14 attached to the arm 3, and the pair of blade bodies 1 and 2 are opened and closed. The position where the engagement position of the other blade body 2 and arm 3 is rotated is on the extension line connecting the axis attachment position of the blade bodies 1 and 2 and the axis attachment position of one blade body 1 and arm 3. A pair of pruning shears characterized in that bodies 1 and 2 are at approximately the maximum open position.