Tree felling target indicator

Abstract

It is known that if the bending line of the undercut (the innermost part (bottom) of the undercut; the intersection of the diagonal cut line and the horizontal cut line) is formed perpendicular to the felling target, then by properly cutting the follow-up cut, the tree can be accurately felled toward the felling target. This specification discloses a technology that reduces the burden of the confirmation work compared to conventional methods and makes it possible to accurately confirm the perpendicular direction to the bending line. [Solution] The tree felling target indicating tool disclosed in this specification has a long, thin plate-like abutment portion having a first long side and a second long side opposite the first long side, and a long, thin plate-like indicating portion extending at a right angle from the center of the first long side. When viewed in plan, the abutment portion and the indicating portion form a T-shape.

Description

[Technical Field]

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

[0002] A common method of felling trees with a chainsaw is to make an undercut aimed at the target, then make a follow-up cut from the opposite side of the undercut, and then use the undercut to fell the tree at the target. The undercut is a notch that opens toward the target, and the follow-up cut is a cut made on the opposite side of the undercut.

[0003] During tree felling operations, if a tree does not fall to the intended location (hereafter referred to as the "felling target"), the fallen tree may collide with nearby people, such as the feller or assistants, or roll or collide with roads, houses, utility poles, or other objects, resulting in a serious accident. Therefore, it is necessary to accurately fell the tree toward the intended location. Experience has shown that if the bend line of the undercut (the innermost part (bottom) of the undercut; the intersection of the diagonal cut line and the horizontal cut line) is formed at a right angle to the felling target, then by making the appropriate follow-up cut, the tree can be accurately felled toward the intended location.

[0004] Non-Patent Document 1 discloses a technique in which, when forming an undercut that determines the felling target of a tree, the short end of a ruler is placed on the bending line of the undercut to check whether the long end extending at a right angle from the short end is facing the felling target. This allows for confirmation of whether the bending line of the undercut is formed at a right angle to the felling target. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Cutting Down Trees with a Chainsaw," edited by Woodsman Workshop LLC, published by Woodsman Workshop LLC, 2021 Summary of the Invention [Problem to be solved by the invention]

[0006] The bend line of the socket is slightly curved to match the shape of the chainsaw's guide bar, but the ruler is formed in an L-shape with its long section extending perpendicularly from the end of its short section. Therefore, when checking the direction perpendicular to the bend line by placing the short section of the ruler against the bend line, as in the technology of Non-Patent Document 1, the short section only touches a portion of the bend line. Therefore, in order to accurately check the direction perpendicular to the bend line, the ruler must be turned over and the short section must be rotated to check from two directions, and the midpoint between these must be determined to be the direction of the bend line, which is a burdensome checking task.

[0007] This specification discloses a technique that reduces the burden of checking work compared to conventional techniques and enables accurate checking of the direction perpendicular to the bending line. [Means for solving the problem]

[0008] The tree felling target indicating tool disclosed in this specification has a long, thin plate-like abutment portion having a first long side and a second long side opposite the first long side, and a long, thin plate-like indicating portion extending at a right angle from the center of the first long side. When viewed in plan, the abutment portion and the indicating portion form a T-shape.

[0009] With the above configuration, the feller can evenly abut the second long side of the abutting portion against the bending line of the undercut (the innermost part (bottom) of the undercut) formed in the tree to be felled. In particular, if the abutting portion is longer than the diameter of the tree, the feller can abut the second long side against the ends of the bending line of the undercut. Therefore, with the above configuration, the feller can have the indicator portion extending perpendicularly from the center of the first long side properly indicate the perpendicular direction to the bending line, regardless of whether the bending line of the undercut is curved, simply by abutting the second long side of the abutting portion against the bending line of the undercut once. This makes it possible to properly check whether the perpendicular direction to the bending line matches the felling target. Therefore, with the above configuration, the burden of the checking work is lighter than in the past, and the perpendicular direction to the bending line can be accurately checked.

[0010] The support portion may have a first portion extending perpendicularly from the center of the one long side and a second portion extending from the first portion. The abutting 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 to be felled often grow on slopes such as mountains. The target direction for felling the tree is often the valley side (downward) of the slope. With this configuration, when the feller brings the second long side of the contact portion into contact with the bending line of the receiving opening, the indicator portion extending perpendicularly from the center of the first long side can indicate the direction perpendicular to the bending line. Since the second portion is bent downward when viewed from the first portion, the second portion can indicate the direction perpendicular to the bending line toward the valley side of the slope. The feller can properly check whether the direction perpendicular to the bending line matches the felling target set on the valley side of the slope.

[0012] The second portion may be angled downward at 45 degrees relative to the first portion.

[0013] With this configuration, when the second long side of the abutting portion abuts against the bending line of the receiving opening, the second portion can properly indicate the direction perpendicular to the bending line toward the valley side of the slope, making it possible to properly check whether the direction perpendicular to the bending line matches the felling target set on the valley side of the slope.

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

[0015] With this configuration, a laser pointer can be attached to the indicator portion. By adjusting the direction in which the indicator portion extends so that the optical axis of the laser pointer attached to the indicator portion coincides, when the second long side of the abutting portion abuts against the bending line of the receiving hole, the indicator portion indicates the direction perpendicular to the bending line, and the laser light emitted from the laser pointer indicates the direction perpendicular to the bending line. This makes it easier for the felling operator to grasp the direction perpendicular to the bending line. The felling operator can properly confirm whether the direction perpendicular to the bending line coincides with the felling target.

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

[0017] The undercut is formed in the tree by cutting diagonally and horizontally into the tree and removing a portion of the trunk with 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 into the bending line of the undercut. The indication part can more appropriately indicate the perpendicular direction to the bending line.

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

[0019] This configuration allows a string or the like to be passed through the through-hole, making the tree felling target indicating device easier to carry. The tree felling target indicating device is less likely to be a hindrance, especially for felling workers who carry a lot of luggage. [Brief explanation of the drawings]

[0020] [Figure 1] 1 shows a perspective view of a tree felling target indicating device 2 according to an embodiment. [Figure 2] 1 shows a plan view of a tree felling target indicating device 2. [Figure 3] A front view of the tree felling target indicating device 2 is shown. [Figure 4] 1 shows an explanatory plan view illustrating a manner of use of the tree felling target indicating device 2. FIG. [Figure 5] 1 shows a front view illustrating how to use the tree felling target indicating device 2. FIG. [Figure 6] An example of using the tree felling target indicating device 2 with a laser pointer 40 attached will be shown. DETAILED DESCRIPTION OF THE INVENTION

[0021] (Example) The tree felling target indicating tool 2 of this embodiment will be described with reference to Figures 1 to 6. The tree felling target indicating tool 2 of this embodiment is an instrument that is placed on the bending line (the innermost part (bottom) of the bending line) of a socket formed in a tree to be felled, to accurately check the perpendicular direction to the bending line.

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

[0023] The abutting portion 10 is the portion that abuts against the bending line of the receiving end of the tree during use. The abutting portion 10 is formed in the shape of an elongated plate. The abutting portion 10 has a first long side 12 and a second long side 14 opposite the first long side 12. The longitudinal length of the abutting portion 10 (i.e., the lengths of the first long side 12 and the second long side 14) is, for example, 30 cm. The length of the abutting portion 10 can be any length depending on the size of the tree to be felled. The thickness of the abutting portion 10 may be, for example, approximately 1 mm to 3 mm. The upper surface of the second long side 14 of the abutting portion 10 is chamfered. That is, an inclined portion 16 is formed by chamfering the upper surface of the second long side 14 of the abutting portion 10. Furthermore, through holes 20 are formed near both longitudinal ends of the abutting portion 10. A string or the like can be passed through the through holes 20.

[0024] The indicator portion 30 is a portion that indicates the direction perpendicular to the bending line during use. Like the abutting portion 10, the indicator portion 30 is formed in the shape of an elongated plate. The indicator portion 30 extends perpendicularly from the center of the first long side 12 of the abutting portion 10. As shown in FIG. 2, when the tree felling target indicator 2 is viewed in plan, the abutting portion 10 and the indicator portion 30 form a T-shape. The longitudinal length of the indicator portion 30 is, for example, 5 cm to 50 cm. The thickness of the indicator portion 30 may be, for example, approximately 1 mm to 3 mm. It is preferable that the thickness of the indicator portion 30 be the same as that of the abutting portion 10.

[0025] The support 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 abutting portion 10. The second portion 34 extends from the first portion 32. As shown in FIG. 3, the abutting portion 10 and the first portion 32 are formed on the same plane. The second portion 34 is bent downward when viewed from the first portion 32. In this embodiment, the second portion 34 is bent downward at 45° relative to the first portion 32. That is, in FIG. 3, the angle θ formed between the extension of the first portion 32 and the second portion is 45°. In other examples, the bend angle 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 indicating device 2 of this embodiment has been described above. Next, the method of use and the effects of the tree felling target indicating device 2 of this embodiment will be described with reference to FIGS. 4 and 5 . As shown in FIGS. 4 and 5 , the tree felling target indicating device 2 of this embodiment is used to confirm the perpendicular direction relative to the bending line 110 (the innermost part (bottom) of the bending line; the intersection of the diagonal cut line L1 and the horizontal cut line L2) of the undercut 100 formed in the tree W to be felled. The undercut 100 is a notch that opens toward the felling target when felling the tree W. Experience has shown that if the bending line 110 of the undercut 100 is formed perpendicular to the felling target, the tree can be accurately felled toward the felling target by subsequently making an appropriate follow-up cut from the opposite side of the undercut 100. It is also known that the bending line 110 of the undercut 100 is often slightly curved to match the shape of the guide bar of the chainsaw used to form the undercut 100.

[0027] As shown in FIGS. 4 and 5 , the feller abuts the second long side 14 of the abutting portion 10 of the tree felling target indicator 2 of this embodiment against the bending line 110 of the receiving end 100 formed in the tree W to be felled. At this time, the feller can abut the second long side 14 evenly against the bending line 110, as shown in FIG. 4 . In this embodiment, because the abutting portion 10 is longer than the bending line 110, the feller can abut the second long side 14 against the ends of the bending line 110 of the receiving end 100. Therefore, in this embodiment, the feller can abut the second long side 14 of the abutting portion 10 against the bending line 110 of the receiving end 100 just once, and the indicator 30 extending at a right angle from the center of the first long side 12 can appropriately indicate the perpendicular direction to the bending line 110, regardless of whether the bending line 110 of the receiving end 100 is curved. It is possible to properly check whether the direction perpendicular to the bending line 110 coincides with the felling target. Therefore, with the tree felling target indicating device 2 of this embodiment, the burden of the checking work is lighter than with conventional devices, and the direction perpendicular to the bending line 110 can be accurately checked. The felling operator can properly check whether the bending line 110 is formed perpendicular to the felling target T.

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

[0029] 5, the receiving hole 100 is formed by cutting diagonally and horizontally into the tree and removing a portion of the trunk to form a triangular cross section. According to the tree felling target indicating device 2 of this embodiment, the upper surface of the second long side 14 is chamfered to form an inclined portion 16. This allows the second long side 14 to easily fit into the bending line 110. This allows the indicating portion 30 to more appropriately indicate the direction perpendicular to the bending line 110.

[0030] 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 indicating device 2 can be easily carried. This makes the tree felling target indicating device 2 less likely to get in the way, especially for felling workers who have a lot of luggage.

[0031] (Other use cases) As shown in FIG. 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, the 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, a laser pointer commonly used in survival games. The laser pointer 40 can be attached to the indicator portion 30 by any method, for example, using a mounter (not shown) that comes with the laser pointer 40. In this example, it is preferable to adjust the optical axis of the laser pointer 40 so that it coincides with the extension direction of the indicator portion 30. The laser pointer 40 can emit laser light 42 in the same direction as the extension direction of the indicator portion 30.

[0032] In this example of use, 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 abutment portion 10 abuts against the bending line 110 of the socket 100, the indicator portion 30 indicates the direction perpendicular to the bending line 110, and the laser light emitted from the laser pointer 40 indicates the direction perpendicular to the bending line 110. This makes it easier for the felling operator to grasp the direction perpendicular to the bending line 110. The felling operator can properly confirm whether the direction perpendicular to the bending line 110 coincides with the felling target T.

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

[0034] (Variation 1) In the above embodiment, the second portion 34 is fixed in a state where it is bent downward at 45 degrees relative to the first portion 32. However, this is not limiting, and in a variation, the second portion 34 may be able to swing relative to the first portion 32. In this case, the bending angle (θ in FIG. 3) of the second portion 34 relative to the first portion 32 may be freely adjustable between 0 degrees and 90 degrees.

[0035] (Variation 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, this is not limiting, and in a variation, at least one of the contact portion 10 and the indicator portion 30 may be foldable. In this case, the felling operator can fold the tree felling target indicator 2 and carry it compactly.

[0036] (Variation 3) Furthermore, the contact portion 10 and the indicator portion 30 may be formed as separate members. In this case, the contact portion 10 and the indicator portion 30 may be detachable. In this case, the felling operator can disassemble the tree felling target indicator 2 and assemble it into a compact unit for easy carrying.

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

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

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

[0040] (Variation 7) The pointing portion 30 may be formed in a shape that makes it impossible to attach the laser pointer 40 thereto.

[0041] Furthermore, the technical elements described in this specification or drawings may exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technologies illustrated in this specification or drawings simultaneously achieve multiple objectives, and achieving one of those objectives alone has technical utility. [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 cutting line L2: Crossing line T: felling target W: Tree

Claims

1. an abutting portion having a long, narrow plate shape and including a first long side and a second long side opposite to the first long side; a support portion in the form of an elongated plate extending perpendicularly from the center of the first long side, The abutting portion and the supporting portion form a T-shape when viewed in a plan view, the indication portion has a first portion extending perpendicularly from a center of the first long side and a second portion extending from the first portion, the second portion is curved downwardly when viewed from the first portion; Tree felling target indicator.

2. A tree felling target indicating device as claimed in claim 1, wherein the abutting portion and the first portion are formed on the same plane.

3. 2. The tree felling target indicator of claim 1, wherein said second portion is angled downward at 45 degrees relative to said first portion.

4. 2. The tree felling target indicating tool according to claim 1, wherein a laser pointer can be attached to said indicating portion.

5. 2. The tree felling target indicating tool according to claim 1, wherein the upper surface side of the second long side of the abutting portion is chamfered.

6. 2. The tree felling target indicating tool according to claim 1, wherein a through hole is formed in the vicinity of at least one longitudinal end of the contact portion.

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