JP5291069B2 - Takaeda Kiritsugu - Google Patents

Description

  The present invention relates to a high branch cutting rod that can cut a high branch of a tree with little effort.

  Conventionally, when cutting a high branch of a tree (a branch tree at a high place), there was no choice but to work on a stepladder. However, the work on the stepladder is likely to fall and is dangerous. In view of such a situation, a scissors (so-called high-edged scissors) in which a cutting blade is attached to the tip of a long shaft has been proposed so far (for example, Patent Document 1). As a result, the worker can cut the high branch while on the ground.

  However, the conventionally proposed high branch culvert has an insufficient cutting force, and even though a thin branch tree can be cut, it is very difficult to cut a thick branch tree. Further, the conventionally proposed Takaeda cutting rod is generally operated by holding the base end side of the shaft with both hands, so that it has a disadvantage that it is inferior in workability.

JP 2006-67899 A

  The present invention has been made in order to solve the above-described problems, and provides a high branch cutting rod that can obtain a large cutting force with a small operating force. It is another object of the present invention to provide a high-edged culvert that can be used while being placed on the ground.

  The above-described problems include a shaft, a pair of cutting blades that are pivotally supported by the distal end portion of the shaft and opened and closed, a cutting blade operation means for operating the cutting blade on the proximal end side of the shaft, and the cutting blade and the cutting blade operation. A high branch cutting rod having an operation wire connected to the cutting blade and transmitting an operation force applied to the cutting blade operation means to the cutting blade, in order to increase the operation force transmitted by the operation wire This is achieved by providing a high branch cutting device characterized in that the operating force increasing means is provided between the cutting blade and the cutting blade operating means. Thereby, it becomes possible to obtain a large cutting force with a small operating force. In this high branch cutting rod, the base end portion of the shaft can be sharply formed so that it can be pushed up to the ground, so that it can be used by being placed on the ground. In this case, the cutting blade operation means is arranged so as to be at the height of the chest from the operator's waist.

  The specific configuration of the operating force increasing means is not particularly limited. Examples are those that increase the operating force using the lever principle and the principle of pulleys. As an operation force increasing means using the lever principle, a lever member having a force point, an action point and a fulcrum, a lever shaft support member for supporting the lever member at the fulcrum, and a shaft for supporting the cutting blade A cutting blade shaft supporting member, a connecting and fixing member for connecting and fixing the lever shaft supporting member and the cutting blade shaft supporting member at a predetermined distance, and an operating point of the lever member and a base end portion of the cutting blade are connected. And a lever guide member that protrudes laterally from the shaft and guides the force point of the lever member along an arc centered on the fulcrum of the lever member. The distal end portion of the operation wire is fixed to the power point of the lever member.

  On the other hand, as an operation force increasing means using the principle of a pulley, a moving pulley movable in a direction parallel to the shaft, a moving pulley guide member for guiding the moving pulley in a direction parallel to the shaft, a moving pulley, and The thing comprised with the case for accommodating a movable pulley guide member is illustrated. The operation wire is a winding wire that is wound around the outer peripheral portion of the moving pulley on the side of the cutting blade and the tip is fixed to the case, and a connecting wire that connects the moving pulley and the base end of the cutting blade. Composed.

  As described above, according to the present invention, it is possible to provide a high branch cutting rod that can obtain a large cutting force with a small operating force. In addition, it is possible to provide a high-edged culvert that can be used while standing on the ground.

It is the side view which showed the whole high branch cutting shear of this invention. It is the side view which showed the whole high branch cutting shear of the 1st embodiment of this invention. FIG. 5 is an enlarged side view showing the periphery of the operating force increasing means when the cutting blade is in the open state in the high branch cutting bar of the first embodiment of the present invention. FIG. 5 is an enlarged side view showing the periphery of the operating force increasing means when the cutting blade is in the closed state in the high branch cutting bar of the first embodiment of the present invention. It is the side view which showed the whole high branch cutting shear of the 2nd embodiment of this invention. It is the side view which expanded and showed the circumference | surroundings of the operating force increase means in the high branch cutter of the 2nd embodiment of this invention. It is the side view which expanded and showed the circumference | surroundings of the operating force increase means in the modification of the high branch cutter of the 2nd embodiment of this invention.

  The preferred embodiment of the high branch cutting device of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a side view showing the entire high branch cutting device of the present invention. As shown in FIG. 1, the high branch cutter according to the present invention includes a shaft 10, a pair of cutting blades 20 that are pivotally supported by the distal end portion of the shaft 10, and a pair of cutting blades 20 that open and close each other. A cutting blade operating means 30 for operating, an operation wire 40 for connecting the cutting blade 20 and the cutting blade operating means 30 and transmitting an operating force applied to the cutting blade operating means 30 to the cutting blade 20; An operation force increasing means 100 for increasing the operation force transmitted by the wire rod 40 is provided. The place where the operating force increasing means 100 is provided is not particularly limited as long as it is between the cutting blade 20 and the cutting blade operating means 30, but is usually near the tip of the shaft 100.

  As shown in FIG. 1, the shaft 10 is formed by joining a plurality of pipes 11 having different diameters. For this reason, the shaft 10 can be expanded and contracted in the longitudinal direction, and the height of the cutting blade 20 can be adjusted according to the height of the branch tree to be cut. ing. The base end portion 11a of the shaft 10 is formed to be sharp and can be projected on the ground. Further, a step 11b for stepping on with a foot is provided around the base end portion 11a of the shaft 10. For this reason, when cutting a high branch with a high branch cutting bar, the high branch cutting bar can be stabilized, and the cutting operation can be performed easily.

  The operation wire 40 may be a chain or a belt, but in the example of FIG. 1, a wire is used. The wire 40 is passed through the inside of the pipe 11. A drum 50 for adjusting the length of the wire 40 is provided on the proximal end side of the shaft 10. When the shaft 10 is expanded and contracted, the length of the wire 40 is adjusted according to the length of the shaft 10. Can be done. Specifically, when the shaft 10 is extended, the wire 40 is fed out from the drum 50, and when the shaft 10 is shortened, the wire 40 can be wound around the drum 50. Although the specific structure of the drum 50 is not particularly limited, it is preferable to employ a gear drum used to stretch a net for volleyball or tennis. Thereby, it becomes possible to fix the wire 40 by arbitrary length.

  As shown in FIG. 1, the cutting blade operating means 30 is a handle that is pivotally supported with respect to the shaft 10. The handle 30 is fixed to the drum 50 and is rotated integrally with the drum 50. When the handle 30 is rotated in the direction of the thick arrow in FIG. 1, the wire 40 is wound around the outer periphery of the drum 50, and the wire 40 pulls the cutting blade 20 to close the cutting blade 20. Yes. The drum 50 is provided with a biasing means (not shown) that biases the drum 50 in a direction to return the drum 50 to the initial position. A coil spring is usually used as the biasing means. For this reason, when the handle 30 is released, the handle 30 automatically returns to the initial position, and the cutting blade 20 opens. Thus, the high branch cutting machine of this invention can open and close the cutting blade 20 by operating the cutting blade operation means 30, and can cut | disconnect a branch tree.

  The operating force increasing means 100 is not particularly limited as long as it has a structure that can increase the operating force applied to the cutting blade operating means 30. Examples of such structures include those utilizing the lever principle and those utilizing the pulley principle. What is common to these structures is that the operating force transmitted by the wire 40 (the cutting force of the cutting blade 20) is greatly increased by converting the displacement of the wire 40 to be small. In the following, the high branch cutting rod of the first embodiment using the lever principle for the operating force increasing means 100 and the high branch cutting rod of the second embodiment using the principle of the pulley for the operating force increasing means 100 will be described in order. To do.

1. First, a high branch cutting machine according to the first embodiment will be described. FIG. 2 is a side view showing the entirety of the high branch cutting device of the first embodiment of the present invention. FIG. 3 is an enlarged side view showing the periphery of the operating force increasing means 100 when the cutting blade 20 is in the open state in the high branch cutting bar of the first embodiment of the present invention. FIG. 4 is an enlarged side view showing the periphery of the operating force increasing means 100 when the cutting blade 20 is in the closed state in the high branch cutting machine of the first embodiment of the present invention. In the first embodiment, as shown in FIGS. 3 and 4, the cutting blade 20 includes a pair of cutting blades 21 and 22, and the wire 40 includes a pair of wires 41 and 42. It has become.

In the high branch cutter of the first embodiment, the operating force increasing means 100 includes a pair of lever members 111, 111 ′, a lever shaft support member 112, and a cutting blade shaft support member 113, as shown in FIGS. The connecting and fixing member 114, the pair of link members 115 and 115 ′, and the pair of lever guide members 116 and 116 ′. The cutting blades 21 and 22 are pivotally supported by the cutting blade shaft support member 113 at their respective fulcrums (corresponding to points E and E ′ in the drawing). For this reason, the cutting blades 21 and 22 can be rotated about the fulcrums E and E ′, respectively.
The distal end portions of the link members 115 and 115 ′ are connected to the base end portions of the cutting blades 21 and 22 in a rotatable state.

As shown in FIGS. 3 and 4, the lever member 111 has a force node 111a having a force point (matching point A in the figure) and a action node 111b having an action point (matching point C in the figure). The angled side view is generally “h” -shaped, and has a structure in which a boundary portion between the force joint 111a and the action node 111b is a fulcrum (coincident with a point B in the figure). On the other hand, the lever member 111 ′ has a predetermined angle between a force node 111a ′ having a force point (matching point A ′ in the figure) and an action node 111b ′ having an action point (matching point C ′ in the figure). Therefore, it has a shape of a letter “f” in a side view, and has a structure in which a boundary portion between the force joint 111a ′ and the action joint 111b ′ becomes a fulcrum (coincides with a point B ′ in the figure). The lengths of the action nodes 111b and 111b ′ (the lengths of the line segment BC and the line segment B′C ′) are the lengths of the force nodes 111a and 111a ′ (the lengths of the line segment AB and the line segment A′B ′). Is set shorter. For this reason, by the lever principle, as shown in FIG. 4, the action points C and C are more than the forces f _A and f _A ′ (only the force f _A is shown in the figure) applied to the force points A and A ′. The forces f _C and f _C ′ acting on “(only f _C is shown in the figure) are larger.

  Further, the fulcrums B and B 'of the lever members 111 and 111' are pivotally supported by the lever shaft support member 112 as shown in FIGS. Therefore, the lever members 111 and 111 'can be rotated around the fulcrums B and B', respectively. The lever shaft support member 112 is connected and fixed to the cutting blade shaft support member 113 by a connection fixing member 114 so that the relative positional relationship between the fulcrums B and B 'and the fulcrums E and E' does not change. In the high branch cutter of the first embodiment, the lever shaft support member 112, the cutting blade shaft support member 113, and the connection fixing member 114 are formed in a square frame shape. Further, the force points A and A ′ (base ends of the force joints 111a and 111a ′) of the lever members 111 and 111 ′ are applied to lever guide members 116 and 116 ′ provided so as to protrude laterally from the distal end portion of the shaft 10. Each is fitted, and has a structure capable of sliding along the lever guide members 116 and 116 ′. The lever guide members 116 and 116a 'are formed in an arc shape centered on the fulcrums B and B', respectively. Therefore, even if the lever members 111 and 111 ′ rotate around the fulcrums B and B ′ and the force points A and A ′ move along the lever guide members 116 and 116 ′, the lever shaft support member 112 moves. There is no such thing. The tips of the wires 41 and 42 are fixed to the force points A and A 'of the lever members 111 and 111', respectively. Further, as shown in FIGS. 3 and 4, the action points C and C ′ of the lever members 111 and 111 ′ are connected to the base end portions of the link members 115 and 115 ′ in a rotatable state.

By configuring the operating force increasing means 100 as described above, the force points A and A ′ of the lever members 111 and 111 ′ can be set by pulling the wires 41 and 42 toward the base end side of the shaft 10 from the state shown in FIG. It is possible to move from the points A ₀ and A ₀ ′ at the outer position to the points A ₁ and A ₁ ′ at the inner position (see FIG. 4). At this time, the base ends D and D ′ of the cutting blades 21 and 22 are pulled by the link members 115 and 115 ′, and the cutting blades 21 and 22 are closed. At this time, the lever members 111 and 111 ′ increase the operation force transmitted by the wires 41 and 42, and a structure capable of obtaining a large cutting force with a slight force. The increasing magnification of the operating force in the lever members 111 and 111 ′ is equal to the ratio of the length of the force joints 111a and 111a ′ to the length of the action nodes 111b and 111b ′. This ratio is not particularly limited as long as it is 1 or more, but is usually 1.5 or more, preferably 2 or more, more preferably 2.5 or more. On the other hand, if this ratio is increased too much, it is necessary to secure the lever guide members 116 and 116 'long. The cutting blades 21 and 22 are urged in a direction to open each other by an urging means (usually a coil spring) (not shown). When the tensile force by the wires 41 and 42 is no longer applied, the cutting blades 21 and 22 automatically open. ing.

  As described above, the high branch cutting rod of the first embodiment increases the operating force transmitted by the wires 41 and 42 by utilizing the lever principle. In the high branch cutting bar according to the first embodiment, two lever members, two link members, and lever guide members are provided, and both of the cutting blades 21 and 22 rotate around fulcrums E and E ′. However, this is not always necessary. That is, only the lever member 111 ′, the link member 115 ′ and the lever guide member 116 ′ are provided, the lever member 111 ′, the link member 115 ′ and the lever guide member 116 ′ are omitted, and only the cutting blade 21 is a fixed blade. An opening / closing operation may be performed on a certain cutting blade 22. In this case, it is possible to simplify the operating force increasing means 100 and make the high branch cutter less likely to be broken and less expensive. Moreover, since the high branch cutting can be reduced in weight, the branch tree can be cut more easily. Since the parts not particularly mentioned in the high branch cutter of the first embodiment are the same as the already described high branch cutter of FIG. 1, the description thereof is omitted.

2. Next, a high branch cutting machine according to the second embodiment will be described. FIG. 5 is a side view showing the entirety of the high branch cutting device of the second embodiment of the present invention. FIG. 6 is an enlarged side view showing the periphery of the operating force increasing means 100 in the high branch cutting device according to the second embodiment of the present invention. In FIG. 6, the shaft 10 and the case 123 are shown cut along a plane passing through the center line of the shaft 10. As shown in FIG. 5, the high branch cutting bar of the second embodiment has a cutting blade 20 composed of a pair of cutting blades 21 and 22, and the wire 40 is fixed only to the base end portion of the cutting blade 21. It has become. That is, the cutting blade 22 is a fixed blade that does not move, and the cutting blade 21 is a movable blade that opens and closes the cutting blade 22. The cutting blade 21 is pivotally supported at a fulcrum E with respect to the cutting blade 22.

  As shown in FIG. 6, in the high branch cutting shear of the second embodiment, the operating force increasing means 100 can be moved in a direction parallel to the shaft 10, and the moving pulley 121 can be moved in a direction parallel to the shaft 10. And a case 123 for housing the moving pulley 121 and the moving pulley guide member 122. The operation wire 40 is wound around an outer peripheral portion of the moving pulley 121 on the cutting blade 20 side, and a winding wire 43 whose tip is fixed to an inner bottom portion of the case 123, a center portion of the moving pulley 121, and a cutting blade. It is comprised with the connection wire 44 which connects 21 base end parts. By configuring the operating force increasing means 100 in this manner, the base end of the winding wire 43 is pulled, whereby the moving pulley 121 is moved to the base end side of the moving pulley guide member 122, and the base end of the cutting blade 21. The cutting blade 21 can be closed with respect to the cutting blade 22 by pulling the portion with the connecting wire 44. At this time, the movable pulley 121 receives the force indicated by the thick arrow in FIG. 6 from the operation wire 40, and the operation force f applied to the winding wire 43 is the cutting force 2f (the magnitude of which is the operation force). Is transmitted to the cutting blade 21 as being twice the force f). For this reason, it has a structure in which a large cutting force can be obtained with a slight force. The cutting blade 21 is biased in the opening direction by a biasing means (usually a coil spring) (not shown), and automatically opens when the tensile force by the connecting wire 44 is no longer applied.

  By the way, the number of the moving pulleys constituting the operation force increasing means 100 is not limited to one, and may be two or more. Thereby, the operation force f applied to the winding wire 43 can be increased four times or more. FIG. 7 is an enlarged side view showing the periphery of the operating force increasing means 100 in a variation of the high branch cutting device according to the second embodiment of the present invention. In FIG. 7, the shaft 10 and the case 123 are shown cut along a plane passing through the center line of the shaft 10. 7 has another moving pulley 124 interposed between the moving pulley 121 and the connecting wire 44. The moving pulley 124 is guided in a direction parallel to the shaft 10 by a moving pulley guide member 125. A winding connecting wire 45 is wound around the outer peripheral portion of the moving pulley 124 on the cutting blade 20 side. The base end portion of the winding connection wire 45 is connected to the center portion of the movable pulley 121, and the distal end portion of the winding connection wire 45 is fixed to the inner bottom portion of the case 123. The base end portion of the connecting wire 44 is connected to the central portion of the movable pulley 124.

  By configuring the operating force increasing means 100 as shown in FIG. 7, by pulling the proximal end portion of the winding wire 43, the movable pulleys 121 and 124 are moved to the proximal end side of the movable pulley guide members 122 and 125. The base end portion of the cutting blade 21 is pulled by the connecting wire 44 so that the cutting blade 21 can be closed with respect to the cutting blade 22. At this time, the movable pulleys 121 and 124 receive the force indicated by the thick arrows in FIG. 7 from the operation wire 40, and the operation force f applied to the winding wire 43 is a cutting force 4f (size). Is transmitted to the cutting blade 21 as 4 times the operating force f). For this reason, it has a structure capable of obtaining a large cutting force with a slight force. In this way, the operating force can be doubled each time the number of moving pulleys incorporated in the operating force increasing means 100 is increased. The parts that are not particularly mentioned in the high branch cutting shears of the second embodiment are the same as the high branch cutting shears of FIG. 1 and the high branch cutting shears of the first embodiment (see FIGS. 2 to 4).

DESCRIPTION OF SYMBOLS 10 Shaft 11 Pipe 11a Base end part 11b Step 20 Cutting blade 21 Cutting blade 22 Cutting blade 30 Handle (cutting blade operation means)
40 wires (wires for operation)
DESCRIPTION OF SYMBOLS 41 Wire 42 Wire 43 Winding wire 44 Connection wire 45 Winding connection wire 50 Drum 100 Operation force increase means 111 Lever member 111a Force node 111b Action node 111 'Lever member 111a' Force member 111b 'Action node 112 Lever shaft support member 113 Cutting blade shaft support member 114 Connection fixing member 115 Link member 115 ′ Link member 116 Lever guide member 116 ′ Lever guide member 121 Moving pulley 122 Moving pulley guide member 123 Case 124 Moving pulley 125 Moving pulley guide member

Claims (3)

The shaft, a pair of cutting blades pivotally supported by the tip of the shaft and opened and closed, a cutting blade operation means for operating the cutting blade on the proximal end side of the shaft, and the cutting blade and the cutting blade operation means are connected And a high branch cutting rod provided with an operation wire that transmits the operating force applied to the cutting blade operating means to the cutting blade,
An operating force increasing means for increasing the operating force transmitted by the operating wire is provided between the cutting blade and the cutting blade operating means ,
The operating force increasing means
The force node having the force point and the action node having the action point form a predetermined angle, the length of the action node is formed shorter than the length of the force node, and the boundary between the force node and the action node is a fulcrum. A lever member made,
A lever support member for supporting the lever member at its fulcrum;
A cutting blade shaft support member for pivotally supporting the cutting blade;
A connection fixing member for connecting and fixing the lever support member and the cutting blade support member at a predetermined distance;
A link member for connecting the action point of the lever member and the base end of the cutting blade;
A lever guide member that protrudes laterally from the shaft, and that guides and slides the force point of the lever member along an arc centered on the fulcrum of the lever member;
Consists of
A high branch cutting rod characterized in that the tip of the operation wire is fixed to the power point of the lever member . The high branch cutting rod according to claim 1, wherein the ratio of the length of the force clause to the length of the working node is 1.5 or more and 5 or less. The shaft has a structure that can expand and contract in the longitudinal direction by connecting a plurality of pipes with different diameters,
3. A high branch cutter according to claim 1 or 2, wherein a gear drum for winding the operation wire is provided on the base end side of the shaft, and the length of the operation wire can be adjusted according to the length of the shaft. scissors.

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