Chain saw and felling method using the same

Abstract

To improve workability and safety in cutting down work of a standing tree using a chain saw.SOLUTION: In a chain saw (1) provided with a guide bar (3) around which a saw chain (4) is wound, a guide mark (9) for confirming a felling direction is provided on the guide bar (3). The guide mark (9) is provided at the widest part of the guide bar (3). Further, in the present invention, in a felling method using a chain saw (1) for felling a standing tree in a preset direction (set direction) by forming a receiving opening in the standing tree using the chain saw (1), the chain saw (1) in which a guide mark (9) for confirming a felling direction is provided on a guide bar (3) around which a saw chain (4) is wound is used, and the receiving opening is formed in the standing tree by the saw chain (4) in a state where the guide mark (9) is directed in the set direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chainsaw provided with a guide bar around which a saw chain is wound, and a felling method using the chainsaw. [Background technology]

[0002] When felling a standing tree, a chainsaw is used to cut a receiving hole that determines the direction in which the tree will actually fall (felling direction) so that the tree will fall in a pre-set direction (set direction).Then, a follower hole is cut with the chainsaw from the rear side of the receiving hole to form a vine, and the vine is used to close the receiving hole, so that the tree will fall in the felling direction in which the receiving hole was formed.

[0003] Therefore, when felling a standing tree, it is very important to form a notch in the tree with a chainsaw so that the set direction and the felling direction match.

[0004] The chainsaws used to fell these standing trees have a guide bar attached to the tip of the body, and an endless saw chain (blade) wound around the guide bar.A linear gun mark is formed on the left side of the body, allowing the chainsaw operator to check the direction in which the tree will be felled (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-21558 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the above-mentioned conventional chainsaws used for felling standing trees, a gun mark is formed on the left side of the body, and a socket hole is formed in the standing tree with a saw chain wound around a guide bar attached to the tip of the body.As a result, the actual cutting position (the socket hole in the standing tree) is separated from the position of the gun mark on the body of the chainsaw, making it difficult for the chainsaw operator to check the gun mark when forming the socket hole, and also making it difficult to accurately point the gun mark in a pre-set direction (set direction), resulting in problems with workability and safety. [Means for solving the problem]

[0007] Therefore, in the present invention as set forth in claim 1, in a chainsaw provided with a guide bar around which a saw chain is wound, a guide mark is provided on the guide bar to allow the user to confirm the felling direction.

[0008] In a second aspect of the present invention, in the first aspect of the present invention, the guide mark is provided on the widest portion of the guide bar.

[0009] In addition, in the present invention according to claim 3, in the present invention according to claim 1 or claim 2, a plurality of guide marks are provided in accordance with the size (diameter) of the standing tree to be felled.

[0010] Furthermore, in the present invention according to claim 4, in a felling method using a chainsaw, in which a receiving hole is formed in a standing tree using the chainsaw and the tree is felled in a pre-set direction (set direction), a chainsaw is used in which a guide mark for checking the felling direction is provided on a guide bar around which the saw chain is wound, and a receiving hole is formed in the standing tree with the saw chain while the guide mark is facing in the set direction.

[0011] Furthermore, in the present invention of claim 5, in the present invention of claim 4, a chainsaw is used in which a plurality of guide marks are provided according to the size (diameter) of the standing tree to be felled, one guide mark is selected from the plurality of guide marks according to the size (diameter) of the standing tree to be felled, and a socket hole is formed in the standing tree with the selected guide mark facing in the set direction using the saw chain. [Effects of the Invention]

[0012] The present invention provides the following effects.

[0013] In other words, in the present invention, in a chainsaw equipped with a guide bar around which the saw chain is wound, a guide mark is provided on the guide bar to check the felling direction, so that when forming a receiving hole in a standing tree, the actual cutting position (the receiving hole of the standing tree) and the position of the guide mark are close to each other, allowing the chainsaw operator to easily check the guide mark and the receiving hole and the guide mark simultaneously when forming the receiving hole, and also allowing the guide mark to be accurately pointed in a pre-set direction (set direction), thereby improving workability and safety during felling operations.

[0014] In particular, if the guide mark is provided at the widest part of the guide bar, the actual cutting position (the receiving hole of the standing tree) can be brought closest to the position of the guide mark when forming the receiving hole during tree felling work, and the guide mark can be formed longer, thereby further improving workability and safety during tree felling work.

[0015] Furthermore, if multiple guide marks are provided according to the size (diameter) of the standing tree to be felled, a guide mark appropriate for the size (diameter) of the standing tree to be felled can be used, further improving the workability and safety of the felling operation.

[0016] Furthermore, in the present invention, in a felling method using a chainsaw, which uses the chainsaw to form a receiving hole in a standing tree and fell the tree in a predetermined direction (set direction), a chainsaw is used that has a guide mark on the guide bar around which the saw chain is wound to confirm the felling direction, and the saw chain forms a receiving hole in the standing tree with the guide mark facing the set direction.As a result, when forming the receiving hole in the tree felling operation, the actual cutting position (the receiving hole in the standing tree) and the position of the guide mark are close to each other, and when forming the receiving hole, the chainsaw operator can easily confirm the guide mark and the receiving hole and guide mark at the same time, and the guide mark can be accurately pointed in the predetermined direction (set direction), thereby improving workability and safety in the felling operation.

[0017] Furthermore, if a chainsaw is used that has multiple guide marks according to the size (diameter) of the standing tree to be felled, and one guide mark is selected from the multiple guide marks according to the size (diameter) of the standing tree to be felled, and the selected guide mark is pointed in the set direction to form a socket in the standing tree with the saw chain, a guide mark appropriate for the size (diameter) of the standing tree to be felled can be used, further improving workability and safety during felling operations. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a left side view illustrating the chainsaw according to the present invention. [Figure 2] FIG. [Figure 3] FIG. 10 is an explanatory diagram showing how to use the guide bar. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific configuration of a chainsaw and a felling method using the chainsaw according to the present invention will be described below with reference to the drawings.

[0020] As shown in Figure 1, the chainsaw 1 has a thin plate-like guide bar 3 that extends forward and backward and is detachably attached to the tip of a main body 2 that houses a drive source and the like, and an endless saw chain 4 that is wound around the guide bar 3 and is rotated by the drive source housed in the main body 2. The main body 2 may have a gun mark 5 formed on the left side.

[0021] The guide bar 3 has a saw chain 4 wound around it so that it can rotate freely along a guide groove formed around it, and a long hole 6 and a pair of upper and lower round holes 7 are formed on the base end side for engaging with the main body 2.

[0022] The guide bar 3 has a middle portion that slightly protrudes outward in an arc shape at the top and bottom, and the middle portion is wider than the tip and base ends.

[0023] In the chainsaw 1, a standing tree (object to be cut) is cut by a blade 8 of a saw chain 4 that moves from the tip end side to the base end side in a wide portion in the middle of the guide bar 3.

[0024] In the present invention, a linear guide mark 9 is formed in the middle and widest part of the guide bar 3 to allow the operator of the chainsaw 1 to confirm the direction in which to fell a standing tree.

[0025] This guide mark 9 is formed as a straight line extending perpendicular to the direction in which the blade 8 of the saw chain 4 moves (the tangent direction of the arc protruding at the lower end of the guide bar 3), and is formed by printing, painting, engraving, etc. on the left side surface of the guide bar 3 (or both the left and right sides).

[0026] The chainsaw 1 is configured as described above, and when using this chainsaw 1 to fell a standing tree, the chainsaw 1 is used to cut a receiving hole that determines the direction in which the tree will actually fall (felling direction) so that the tree will fall in a pre-set direction (set direction), and then the chainsaw 1 is used to cut a follower hole from the rear side of the receiving hole to form a vine, which is then used to close the receiving hole, thereby felling the tree in the felling direction in which the receiving hole was formed.

[0027] Therefore, when felling a standing tree, it is extremely important to accurately form a notch in the tree with the chainsaw 1 so that the set direction and the felling direction coincide.

[0028] Therefore, in the present invention, a chainsaw 1 is used in which the above-mentioned guide bar 3 is provided with a guide mark 9 for checking the felling direction, and the operator of the chainsaw 1 visually aligns the extension direction of the guide mark 9 with the set direction, and then uses the saw chain 4 to form a receiving hole in the standing tree.

[0029] This allows the receiving hole to be formed accurately in the set direction when felling a standing tree, and the set direction and felling direction coincide, allowing the standing tree to be felled in the set direction.

[0030] As described above, the chainsaw 1 is configured such that the guide bar 3 is provided with the guide mark 9 for checking the felling direction.

[0031] Therefore, with a chainsaw 1 having the above configuration, when forming a receiving hole in a standing tree, the actual cutting position (the receiving hole in the standing tree) and the position of the guide mark 9 are close to each other, and when forming the receiving hole, the operator of the chainsaw 1 can easily check the guide mark 9 and the receiving hole and the guide mark 9 at the same time, thereby improving workability in felling operations.Furthermore, since the guide mark 9 can be accurately oriented in a pre-set direction (set direction), standing trees can be felled in the set direction, improving safety in felling operations.

[0032] Furthermore, the chainsaw 1 is configured such that the guide mark 9 is provided at the widest portion of the guide bar 3.

[0033] Therefore, with the chainsaw 1 configured as described above, when forming a receiving hole during tree felling work, the actual cutting position (the receiving hole of the standing tree) and the position of the guide mark 9 can be brought closest to each other, and the guide mark 9 can be formed longer, thereby further improving workability and safety during tree felling work.

[0034] Furthermore, the felling method using the chainsaw 1 described above involves using a chainsaw 1 having a guide bar 3 around which a saw chain 4 is wound, with guide marks 9 for checking the felling direction, and forming a receiving hole in the standing tree with the saw chain 4 while the guide marks 9 are facing in the set direction.

[0035] Therefore, with a chainsaw 1 having the above configuration, when forming a receiving hole in a standing tree, the actual cutting position (the receiving hole in the standing tree) and the position of the guide mark 9 are close to each other, and when forming the receiving hole, the operator of the chainsaw 1 can easily check the guide mark 9 and the receiving hole and the guide mark 9 at the same time, thereby improving workability in felling operations.Furthermore, since the guide mark 9 can be accurately oriented in a pre-set direction (set direction), standing trees can be felled in the set direction, improving safety in felling operations.

[0036] In the above chainsaw 1, one guide mark 9 is formed on the guide bar 3, but this is not limited to this. For example, as shown in Figure 3, multiple guide marks 9a, 9b, 9c (here, three) may be formed on the guide bar 3'.

[0037] At this time, a plurality of guide marks 9a, 9b, 9c may be formed according to the size (diameter: may be maximum diameter, average diameter, or minimum diameter) of the standing tree for which a receiving hole is to be formed during felling work.

[0038] Here, guide mark 9a is formed in the center (widest part) of guide bar 3' for standing trees of a size within a predetermined range (standard range) (schematically shown by solid lines in Figure 3), guide mark 9b is formed on the base end side of guide bar 3' for standing trees of a size smaller than the standard range (schematically shown by dotted lines in Figure 3), and guide mark 9c is formed on the tip end side of guide bar 3' for standing trees of a size larger than the standard range (schematically shown by double-dotted lines in Figure 3).

[0039] During felling work, a chainsaw 1 having multiple guide marks 9a, 9b, 9c according to the size (diameter) of the standing tree to be felled is used, and one guide mark 9a (9b, 9c) is selected from the multiple guide marks 9a, 9b, 9c according to the size (diameter) of the standing tree to be felled, and a socket hole is formed in the standing tree with the saw chain 4 while the selected guide mark 9a (9b, 9c) is facing in the set direction.

[0040] In this way, if multiple guide marks 9a, 9b, 9c are provided according to the size (diameter) of the standing tree to be felled, the guide marks 9a, 9b, 9c that are appropriate for the size (diameter) of the standing tree to be felled can be selected and used, thereby further improving the workability and safety of the felling operation. [Explanation of symbols]

[0041] 1 Chainsaw 2 Main unit 3.3' Guide Bar 4 Saw Chain 5 Gun mark 6 Slot 7 round holes 8 blades 9, 9a, 9b, 9c Guide marks

Claims

1. In a chainsaw equipped with a guide bar around which a saw chain is wound, This chainsaw is characterized by having guide marks on the guide bar to help confirm the felling direction.

2. 2. The chainsaw according to claim 1, wherein the guide mark is provided at the widest portion of the guide bar.

3. 3. The chainsaw according to claim 1, wherein a plurality of guide marks are provided in accordance with the size (diameter) of the tree to be felled.

4. A felling method using a chainsaw in which a receiving hole is formed in a standing tree using a chainsaw and the standing tree is felled in a predetermined direction (predetermined direction), This method of felling trees using a chainsaw is characterized by using a chainsaw with a guide bar around which the saw chain is wound, on which a guide mark for checking the felling direction is provided, and forming a socket in a standing tree with the saw chain while the guide mark is facing the set direction.

5. A felling method using a chainsaw as described in claim 4, characterized in that a chainsaw is used in which a plurality of guide marks are provided according to the size (diameter) of the standing tree to be felled, one guide mark is selected from the plurality of guide marks according to the size (diameter) of the standing tree to be felled, and a socket is formed in the standing tree with the saw chain while the selected guide mark is facing in the set direction.

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