Tree felling target indicator

Abstract

It is known that if the bend line of the undercut (the innermost part (bottom) of the undercut, the intersection of the diagonal cut line and the cross cut line) is formed perpendicular to the felling target, then by making an appropriate back cut afterward, the tree can be felled accurately toward the felling target. This specification discloses a technique that reduces the burden of verification work compared to conventional methods and allows for accurate verification of the direction perpendicular to the bend line. [Solution] The tree felling target indicator disclosed herein is elongated and plate-shaped, and has a contact portion having a first long side and a second long side opposite to the first long side, and an elongated plate-shaped indicator portion extending perpendicularly from the center of the first long side. When viewed from above, the contact portion and the indicator portion form a T shape.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a tree felling target indicator.

Background Art

[0002] As a method of felling a tree using a chainsaw, after forming a receiving notch that aims at the felling target and cutting it, a chasing notch is cut from the opposite side of the receiving notch, and then the tree is felled towards the target determined at the receiving notch. The receiving notch is a notch that opens towards the felling target, and the chasing notch is a cut formed from the opposite side of the receiving notch.

[0003] In the tree felling operation, if the tree does not fall at the intended location (hereinafter referred to as the "felling target"), serious accidents may occur where the felled tree collides with people around the felling operator and assistants, or rolls or collides with roads, houses, utility poles, and other installations. Therefore, it is required to accurately fell the tree towards the felling target. Empirically, if the bending line of the receiving notch (the innermost part (bottom) of the receiving notch. The intersection of the diagonal cut line and the horizontal cut line) is formed at a right angle to the felling target, it is known that by appropriately cutting the chasing notch thereafter, the tree can be accurately felled towards the felling target.

[0004] Non-Patent Document 1 discloses a technique for confirming whether the longitudinal part extending at a right angle from the short side portion of a jig is facing the felling target when forming a receiving notch for determining the felling target of a tree. Thereby, it is intended to confirm whether the bending line of the receiving notch is formed at a right angle to the felling target.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

[0006] The bend line of the receiving end is slightly curved to follow the shape of the chainsaw's guide bar, but the square is formed in an L-shape with the long side extending perpendicularly from the end of the short side. Therefore, when checking the direction perpendicular to the bend line by applying the short side of the square, as in the technique described in Non-Patent Document 1, the short side only touches a portion of the bend line. For this reason, in order to accurately check the direction perpendicular to the bend line, the square must be turned over to change the orientation of the short side and checked from two directions, and the midpoint between them must be judged as the direction of the bend line, which is a burdensome checking process.

[0007] This specification discloses a technology that reduces the workload of verification work compared to conventional methods and allows for accurate verification of directions perpendicular to the bend line. [Means for solving the problem]

[0008] The tree felling target indicator disclosed herein is elongated and plate-shaped, having a contact portion having a first long side and a second long side opposite the first long side, and an elongated plate-shaped indicator portion extending perpendicularly from the center of the first long side. When viewed from above, the contact portion and the indicator portion form a T shape.

[0009] With the above configuration, the felling worker can evenly contact the second long side of the contact portion with the bend line of the notch (the innermost part (bottom) of the notch) formed in the tree to be felled. In particular, if the contact portion is longer than the diameter of the tree, the felling worker can contact the ends of the bend line of the notch with the second long side. Therefore, with the above configuration, by having the felling worker contact the bend line of the notch with the second long side of the contact portion just once, the direction perpendicular to the bend line can be appropriately indicated on the indicator portion extending perpendicularly from the center of the first long side, regardless of whether the bend line of the notch is curved or not. It is possible to appropriately confirm whether the direction perpendicular to the bend line coincides with the felling target. Accordingly, with the above configuration, the burden of confirmation work is reduced compared to conventional methods, and the direction perpendicular to the bend line can be accurately confirmed.

[0010] The indicating portion may have a first portion extending perpendicularly from the center of one of the longer sides, and a second portion extending from the first portion. The contact portion and the first portion may be formed on the same plane. The second portion may be curved downward when viewed from the first portion.

[0011] Trees targeted for felling often grow on slopes such as mountains. The intended felling direction is often towards the valley side (downward) of the slope. With this configuration, when the felling operator brings the second long side of the contact section against the bend line of the receiving end, the indicator section extending perpendicularly from the center of the first long side can point perpendicular to the bend line. Because the second section is bent downwards relative to the first section, it can point perpendicular to the bend line towards the valley side of the slope. The felling operator can then appropriately confirm whether the direction perpendicular to the bend line coincides with the felling target set on the valley side of the slope.

[0012] The second portion may be bent downward at a 45° angle relative to the first portion.

[0013] With this configuration, when the second long side of the contact portion comes into contact with the bend line of the receiving end, the second portion can appropriately indicate a direction perpendicular to the bend line toward the valley side of the slope. It is possible to appropriately confirm whether the direction perpendicular to the bend line coincides with the felling target set on the valley side of the slope.

[0014] A laser pointer may be attached to the aforementioned indicator portion.

[0015] With this configuration, a laser pointer can be attached to the indicator part. By adjusting the direction in which the indicator part extends and the optical axis of the laser pointer attached to the indicator part to coincide, when the second long side of the contact part contacts the bend line of the receiving end, the indicator part will indicate a direction perpendicular to the bend line, and the laser light emitted from the laser pointer will also indicate a direction perpendicular to the bend line. This makes it easier for felling workers to grasp the direction perpendicular to the bend line. Felling workers can properly confirm whether the direction perpendicular to the bend line coincides with the felling target.

[0016] The upper side of the second long side of the contact portion may be chamfered.

[0017] The notch formed in a tree is created by making incisions from both diagonal and horizontal directions into the tree, and by cutting off a portion of the trunk in a triangular cross-section. With this configuration, the upper surface of the second long side is chamfered, making it easier for the second long side to fit the bending line of the notch. This allows for more accurate indication of the direction perpendicular to the bending line in the indicator area.

[0018] A through hole may be formed near at least one end of the contact portion in the longitudinal direction.

[0019] This configuration allows for threading strings or other materials through the through-holes, making the tree felling target indicator easier to carry. This is especially beneficial for fellers carrying heavy loads, as the tree felling target indicator becomes less of a hindrance. [Brief explanation of the drawing]

[0020] [Figure 1] Shows a perspective view of the tree felling target indicator 2 of the embodiment. [Figure 2] Shows a plan view of the tree felling target indicator 2. [Figure 3] Shows a front view of the tree felling target indicator 2. [Figure 4] Shows a plan explanatory view for explaining the usage mode of the tree felling target indicator 2. [Figure 5] Shows a front explanatory view for explaining the usage mode of the tree felling target indicator 2. [Figure 6] Shows an example of using the tree felling target indicator 2 with the laser pointer 40 attached.

Mode for Carrying Out the Invention

[0021] (Example) The tree felling target indicator 2 of this embodiment will be described with reference to FIGS. 1 to 6. The tree felling target indicator 2 of this embodiment is an instrument for accurately confirming the direction perpendicular to the bending line (the innermost part (bottom) of the receiving port) of the receiving port formed in the tree to be felled by applying it to the bending line.

[0022] As shown in FIGS. 1 to 3, the tree felling target indicator 2 of this embodiment includes an abutting portion 10 and an indicating portion 30. Both the abutting portion 10 and the indicating portion 30 are formed of elongated plate-like members. The abutting portion 10 and the indicating portion 30 are integrally formed. The abutting portion 10 and the indicating portion 30 are formed of, for example, plate-like members made of metal. The metal forming the abutting portion 10 and the indicating portion 30 may be, for example, aluminum, copper, iron, stainless steel, an alloy of two or more of these metals, etc. In another example, the abutting portion 10 and the indicating portion 30 may be formed of materials other than metal, such as resin or wood.

[0023] The contact portion 10 is the part that comes into contact with the bend line of the tree's receiving end when in use. The contact portion 10 is formed in the shape of an elongated plate. The contact portion 10 has a first long side 12 and a second long side 14 on the opposite side of the first long side 12. The length of the contact portion 10 in the longitudinal direction (i.e., the length of the first long side 12 and the second long side 14) is, for example, 30 cm. The length of the contact portion 10 can be any length depending on the size of the tree to be felled. The thickness of the contact portion 10 can be, for example, about 1 mm to 3 mm. The upper side of the second long side 14 of the contact portion 10 is chamfered. That is, a beveled portion 16 is formed on the upper side of the second long side 14 of the contact portion 10 by the chamfering. Also, through holes 20 are formed near both ends in the longitudinal direction of the contact portion 10. A string or the like can be passed through the through holes 20.

[0024] The indicator portion 30 is the part that indicates a direction perpendicular to the bending line when in use. The indicator portion 30 is also formed in the same elongated plate shape as the contact portion 10. The indicator portion 30 extends perpendicularly from the center of the first long side 12 of the contact portion 10. As shown in Figure 2, when the tree felling target indicator 2 is viewed from above, the contact portion 10 and the indicator portion 30 form a T shape. The length of the indicator portion 30 in the longitudinal direction is, for example, 5 cm to 50 cm. The thickness of the indicator portion 30 can be, for example, about 1 mm to 3 mm. It is preferable that the thickness of the indicator portion 30 is the same as the thickness of the contact portion 10.

[0025] The indicator portion 30 has a first portion 32 and a second portion 34. The first portion 32 extends perpendicularly from the center of the first long side 12 of the contact portion 10. The second portion 34 extends from the first portion 32. As shown in Figure 3, the contact portion 10 and the first portion 32 are formed on the same plane. The second portion 34 is curved downward when viewed from the first portion 32. In this embodiment, the second portion 34 is curved downward at 45° relative to the first portion 32. That is, in Figure 3, the angle θ formed by the extension of the first portion 32 and the second portion is 45°. In other examples, the angle of curvature of the second portion 34 relative to the first portion 32 is not limited to 45° and may be any angle.

[0026] The configuration of the tree felling target indicator 2 of this embodiment has been described above. Next, the method of use and effects of the tree felling target indicator 2 of this embodiment will be explained with reference to Figures 4 and 5. As shown in Figures 4 and 5, the tree felling target indicator 2 of this embodiment is used to confirm the direction perpendicular to the bend line 110 (the innermost part (bottom) of the notch, the intersection of the diagonal cut line L1 and the cross cut line L2) of the notch 100 formed in the tree W to be felled. The notch 100 is a notch that opens toward the felling target when felling the tree W. From experience, it is known that if the bend line 110 of the notch 100 is formed perpendicular to the felling target, the tree can be accurately felled toward the felling target by then appropriately cutting the back cut from the opposite side of the notch 100. It is also known that the bend line 110 of the notch 100 is often slightly curved along the shape of the guide bar of the chainsaw used to form the notch 100.

[0027] As shown in Figures 4 and 5, the felling worker brings the second long side 14 of the contact portion 10 of the tree felling target indicator 2 of this embodiment into contact with the bend line 110 of the notch 100 formed in the tree W to be felled. At this time, as shown in Figure 4, the felling worker can bring the second long side 14 into contact with the bend line 110 evenly. In this embodiment, since the contact portion 10 is longer than the bend line 110, the felling worker can bring the second long side 14 into contact with the ends of the bend line 110 of the notch 100. Therefore, in this embodiment, by bringing the second long side 14 of the contact portion 10 into contact with the bend line 110 of the notch 100 just once, the felling worker can appropriately indicate the direction perpendicular to the bend line 110 on the indicator portion 30 that extends perpendicularly from the center of the first long side 12, regardless of whether the bend line 110 of the notch 100 is curved or not. It is possible to appropriately confirm whether the direction perpendicular to the bend line coincides with the felling target. Therefore, with the tree felling target indicator 2 of this embodiment, the burden of confirmation work is reduced compared to conventional methods, and the direction perpendicular to the bend line 110 can be accurately confirmed. The felling worker can appropriately confirm whether the bend line 110 is formed perpendicular to the felling target T.

[0028] As shown in Figure 5, trees W to be felled often grow on slopes such as mountains. The intended direction for felling the trees W is often the valley side (downward side) of the slope. With the tree felling target indicator 2 of this embodiment, when a felling worker brings the second long side 14 of the contact part 10 into contact with the bend line 110 of the receiving opening 100, the indicator part 30, which extends perpendicularly from the center of the first long side 12, can indicate a direction perpendicular to the bend line 110. In this case, since the second part 34 is bent downward at 45° relative to the first part 32, the second part 34 can indicate a direction perpendicular to the bend line 110 toward the valley side of the slope. It is possible to appropriately confirm whether the direction perpendicular to the bend line 110 coincides with the felling target T set on the valley side of the slope.

[0029] Furthermore, as shown in Figure 5, the receiving opening 100 is formed by making cuts into the tree from diagonal and horizontal directions, and cutting off a portion of the trunk in a triangular cross-section. In the tree felling target indicator 2 of this embodiment, the upper side of the second long side 14 is chamfered, and an inclined portion 16 is formed. Therefore, the second long side 14 is more easily fitted to the bending line 110. The indicator portion 30 can be more appropriately indicated in the direction perpendicular to the bending line 110.

[0030] Furthermore, in this embodiment, through holes 20 are formed near both longitudinal ends of the contact portion 10. By passing a string or the like through the through holes 20, the tree felling target indicator 2 becomes easier to carry. In particular, for felling workers who have a lot of luggage, the tree felling target indicator 2 becomes less of a hindrance.

[0031] (Other usage examples) As shown in Figure 6, a laser pointer 40 can be attached to the indicator portion 30 of the tree felling target indicator 2 of this embodiment. When using the tree felling target indicator 2 of this embodiment, a laser pointer 40 can be attached to the indicator portion 30. The laser pointer 40 attached to the indicator portion 30 can be, for example, one that is popular for use in survival games. The method of attaching the laser pointer 40 to the indicator portion 30 is arbitrary, but for example, it can be attached using a mount (not shown) attached to the laser pointer 40. In this example of use, it is preferable to adjust the optical axis of the laser pointer 40 so that it coincides with the direction in which the indicator portion 30 extends. The laser pointer 40 can irradiate laser light 42 in a direction that coincides with the direction in which the indicator portion 30 extends.

[0032] In this example, by adjusting the direction in which the indicator portion 30 extends and the optical axis of the laser pointer 40 attached to the indicator portion 30 to coincide, when the second long side 14 of the contact portion 10 contacts the bend line 110 of the receiving opening 100, the indicator portion 30 will indicate a direction perpendicular to the bend line 110, and the laser light emitted from the laser pointer 40 will also indicate a direction perpendicular to the bend line 110. This makes it easier for the felling worker to grasp the direction perpendicular to the bend line 110. The felling worker can appropriately confirm whether the direction perpendicular to the bend line 110 coincides with the felling target T.

[0033] Although the examples have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples illustrated above. For example, the following modifications may be adopted.

[0034] (Modification 1) In the above embodiment, the second part 34 is fixed in a position bent 45° downward relative to the first part 32. However, it is not limited to this, and in modifications, the second part 34 may be pivotable relative to the first part 32. In that case, the bending angle of the second part 34 relative to the first part 32 (θ in Figure 3) may be freely adjustable between 0° and 90°.

[0035] (Modification 2) In the above embodiment, the contact portion 10 and the indicator portion 30 are integrally formed from a plate-like member and do not deform. However, in modifications, at least one of the contact portion 10 and the indicator portion 30 may be foldable. In this case, the felling worker can fold the tree felling target indicator 2 and carry it compactly.

[0036] (Modification 3) Furthermore, the contact portion 10 and the indicator portion 30 may be formed from separate components. In this case, the contact portion 10 and the indicator portion 30 may be detachable. In this case, the felling worker can disassemble the tree felling target indicator 2 and carry it in a compact form.

[0037] (Modification 4) The second part 34 does not have to be curved relative to the first part 32. That is, in the modification, the contact portion and the indicator portion may be formed on the same plane. The tree felling target indicator may be formed in the shape of a T-square.

[0038] (Modification 5) The upper surface of the second long side 14 does not need to be chamfered. That is, the inclined portion 16 does not need to be provided.

[0039] (Modification 6) The through hole 20 may be formed only near one end of the contact portion 10 in the longitudinal direction. In yet another example, the contact portion 10 may not have a through hole 20.

[0040] (Modification 7) The indicator portion 30 may be formed in a shape that prevents the attachment of the laser pointer 40.

[0041] Furthermore, the technical elements described herein or in the drawings demonstrate technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technologies illustrated herein or in the drawings achieve multiple objectives simultaneously, and achieving even one of these objectives constitutes technical usefulness in itself. [Explanation of Symbols]

[0042] 2: Tree felling target indicator 10: Contact part 12: First long side 14: Second long side 16: Inclined part 20: Through hole 30: Instruction part 32: Part 1 34:Second part 40: Laser pointer 42: Laser light 100: Underbite 110: Bent line L1: Diagonal cut line L2: Crosscut line T: felling target W: Tree

Claims

1. It is an elongated plate shape, and has a contact portion having a first long side and a second long side opposite to the first long side, It has an elongated plate-shaped support portion that extends perpendicularly from the center of the first long side, When viewed from above, the contact portion and the indicating portion form a T-shape. Tree felling target indicator.

2. The indicated portion has a first portion extending perpendicularly from the center of the first long side, and a second portion extending from the first portion. The contact portion and the first portion are formed on the same plane. The tree felling target indicator according to claim 1, wherein the second part is curved downward when viewed from the first part.

3. The tree felling target indicator according to claim 2, wherein the second portion is bent downward at a 45° angle relative to the first portion.

4. The tree felling target indicator according to claim 1, wherein a laser pointer can be attached to the indicator portion.

5. The tree felling target indicator according to claim 1, wherein the upper surface of the second long side of the contact portion is chamfered.

6. The tree felling target indicator according to claim 1, wherein a through hole is formed near at least one end in the longitudinal direction of the contact portion.

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