Cord holder

Abstract

To provide a cord holder which has a mechanism for adjusting a length of a cord and which has light weight and good operability compared to a configuration provided with a cord winding portion therein.SOLUTION: A cord holder used by being attached to a tip part of an operation rod of a bush cutter includes a support section and a cord attached to the support section. The support section is shaped such as to generate a lift force by rotation, and the support section includes: a first fixing section for fixing a base end section of the cord; and a second fixing section for fixing a middle of the cord. The cord is switchable between two states: a state where the base end part of the cord is fixed to the first fixing section and the middle of the cord is fixed to the second fixing section; and a state where the base end part of the cord is fixed to one of the first fixing section and the second fixing section and is not fixed to the other of the first fixing section and the second fixing section.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cord holder that is attached to the tip of an operating pole of a brush cutter. [Background technology]

[0002] When cutting weeds, a corded brush cutter may be used, as shown in Patent Document 1 below. In a corded brush cutter, the cord is wound around a winding section built into a thick, disk-shaped cord holder attached to the tip of the operating rod. When the cord becomes worn out, the locking mechanism is released and the cord that was wound around the winding section is unwound.

[0003] Also, as shown in Patent Document 2, a tipped saw having a blade provided on the circumferential portion of a metal disk, and having a plurality of protrusions with air inlet holes is known. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3003945 [Patent Document 2] Japanese Patent Application Publication No. 9-233930 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional cord holders such as the one described in Patent Document 1 can easily maintain the sharpness of a cord by unwinding the cord wound around the winding part when the cord becomes worn. However, conventional cord holders have a problem in that they tend to be heavy because they are equipped with a spring for operating the locking mechanism, a winding part for winding the cord, a case for protecting the cord, etc.

[0006] The cord holder is attached to the tip of the control rod. Mowing is done by swinging the control rod from side to side. If there is a heavy object at the tip of the control rod, the user will easily get tired when operating the control rod.

[0007] The idea of ​​generating lift to reduce fatigue is known, as in Patent Document 2. However, the invention in Patent Document 2 relates to a so-called tip saw. Patent Document 2 does not describe a mechanism for adjusting the length of the cord when the cord becomes worn.

[0008] An object of the present invention is to provide a cord holder which is equipped with a mechanism for adjusting the length of the cord and which is lighter and easier to operate than a cord holder which has a built-in cord winding portion. [Means for solving the problem]

[0009] The above problem is solved by a cord holder that is attached to the tip of the operating rod of a brush cutter, the cord holder having a support part that is shaped to generate lift when rotated, and the support part having a first fixing part for fixing the base end of the cord, and a second fixing part for fixing the middle of the cord, and the cord holder is configured to allow the cord to be switched between two states: a state in which the base end of the cord is fixed to the first fixing part and the middle of the cord is fixed to the second fixing part, and a state in which the base end of the cord is fixed to either the first fixing part or the second fixing part, and not fixed to the other of the first fixing part or the second fixing part.

[0010] In the above cord holder, the second fixing part is preferably a groove into which an annular member or cord provided on the support part is fitted. If the second fixing part is a groove into which an annular member or cord is fitted, the cord can be prevented from bending significantly at the portion where the cord protrudes from the support part when the cord is fixed to the second fixing part. This allows the cord to protrude to the side with relatively little bending, and allows the cord to be positioned in a position that makes it easy to cut weeds.

[0011] In the above cord holder, when the direction in which the support part is lifted by lift is defined as "up," it is preferable that the groove into which the annular member or cord is fitted is provided on the upper surface of the cord holder. When the cord holder is rotated by the driving force of the brush cutter, an airflow is generated along the bottom surface of the support part. This airflow generates lift. By providing the annular member or the like on the upper surface, it is possible to prevent disturbances in the lift.

[0012] In the above cord holder, it is preferable that a hook is provided at the base end of the cord, and when the cord is pulled toward the tip end, the hook hooks onto the first or second fixing part, and when the cord is pulled toward the base end, the cord is released from the first or second fixing part. With this configuration, the length of the cord can be easily adjusted. Since centrifugal force acts toward the tip end of the cord and the hook prevents the cord from coming off, the cord will not fall off while the brush cutter is in operation.

[0013] In the above cord holder, the first fixing part and the second fixing part are preferably provided at positions for fixing the cord in a bent state. This configuration makes it possible to prevent the cord from unintentionally moving toward its base end and falling off the support part. Effect of the Invention

[0014] An object of the present invention is to provide a cord holder which is equipped with a mechanism for adjusting the length of the cord and which is lighter and easier to operate than a cord holder which has a built-in cord winding portion. [Brief description of the drawings]

[0015] [Figure 1] 1 is a side view showing a state in which a cord holder according to an embodiment is attached to the tip of an operating pole of a brush cutter. [Diagram 2] 2 is a perspective view showing the upper surface side of the cord holder shown in FIG. 1. [Diagram 3] 2 is a perspective view showing the bottom side of the cord holder shown in FIG. 1. [Figure 4] FIG. 2 is a side view of the cord holder shown in FIG. [Diagram 5] FIG. 13 is a perspective view showing a state in which the cord is reattached to increase its length when the cord is worn out. [Figure 6] 2 is a perspective view showing only a cord fixed to the cord holder shown in FIG. 1. [Figure 7] FIG. 11 is a side view showing an example of a groove into which a cord is fitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of the cord holder of the present invention will be described below. Each embodiment and use example shown below is merely an example of the present invention, and the technical scope of the present invention is not limited to the exemplified embodiment.

[0017] As shown in Fig. 1, the cord holder 1 of this embodiment is attached to the tip of the operating rod 8 of a brush cutter when used. As shown in Figs. 2 to 5, the cord holder 1 has a support part 11. A cord 2 is fixed to the support part 11. The support part 11 is shaped to generate lift when rotated. The support part 11 has a first fixing part 12 for fixing the base end of the cord 2, and a second fixing part 13 for fixing the middle of the cord 2. In this specification, the term "middle" refers to the area excluding the ends of the cord, and does not mean only the center of the cord.

[0018] The support 11 has a shape obtained by bending a metal plate. The center of the support 11 has a flat shape suitable for attaching the tip of the operating rod 8, and a through hole is provided in the center as an attachment part for the tip of the operating rod 8. A plurality of lift generating parts 14 are provided on the outer edge of the support 11. The lift generating parts 14 have a shape having an arc-shaped convex part protruding upward. The lift generating parts 14 have a shape that slopes downward toward the direction in which the support 11 rotates. The direction in which the support rotates is shown by an arrow in FIG. 2. When the lift generating parts 14 are rotated by the power supplied from the operating rod 8, an airflow is generated along the bottom surface of the lift generating parts 14, and lift is generated in the direction in which the tip of the operating rod 8 floats up, that is, in the direction shown by the arrow in FIG. 1. This reduces the weight of the tip of the operating rod, improving the operability of the operating rod. In this specification, the direction in which the support portion 11 rises due to lift is defined as "up."

[0019] The support part 11 is lightweight and does not include a winding part for winding the cord. In addition, when the support part 11 is rotated, a lifting force acts as described above, so that the operability is good.

[0020] The support part 11 does not have a blade and supports the cord 2 by fixing it. The cord 2 is configured so that the cord can be switched between two states: a state in which the base end of the cord 2 is fixed to the first fixing part 12 and the middle part of the cord is fixed to the second fixing part 13 as shown in FIG. 2, and a state in which the base end of the cord 2 is fixed to one of the first fixing part 12 or the second fixing part 13 and is not fixed to the other of the first fixing part 12 or the second fixing part 13 as shown in FIG. 5. In the examples shown in FIGS. 2 and 5, the first fixing part 12 is composed of a through hole provided in the support part 11, and the second fixing part 13 is composed of an annular member provided on the upper surface of the support part 11. In the example shown in FIG. 5, the base end of the cord 2 is fixed to the second fixing part 13. Although not shown, the base end of the cord 2 may be fixed to the first fixing part 12.

[0021] The first fixing part 12 is a through hole having an inner diameter larger than the diameter of the cord 2, and the cord 2 can be inserted through the through hole. As shown in FIG. 6, the base end of the cord 2 is provided with a hooking part 21 having a diameter larger than the inner diameter of the through hole. The tip end of the cord 2 does not have a hooking part. When the cord 2 is fixed to the first fixing part 12 or the second fixing part 13, the tip end of the cord 2 is inserted into the first fixing part 12 or the second fixing part 13. The hooking part 21 provided at the base end of the cord 2 contacts the first fixing part 12 or the second fixing part 13 to prevent the cord from coming off. In the example of FIG. 3, the cord 2 is inserted into the through hole 12 from the back surface of the support part 11. Therefore, the hooking part 21 hooks on the edge of the through hole 12 on the back surface of the support part 11. In this configuration, most of the cord 2 is exposed on the upper surface of the support part 11, and almost no cord 2 is exposed on the lower surface of the support part 11. The cord is less likely to disrupt the airflow.

[0022] As shown in Fig. 2, when the cord 2 is sufficiently long, the base end of the cord 2 is fixed to the first fixing part 12, and the middle part of the cord is fixed to the second fixing part 13. This prevents the length of the cord 2 protruding from the support part 11 from becoming excessively long. When the cord 2 is worn and shortened, as shown in Fig. 5, the base end of the cord 2 is fixed to either the first fixing part 12 or the second fixing part 13, and is not fixed to the other of the first fixing part 12 or the second fixing part 13. In this manner, with a simple configuration that does not use a winding part, the cord 2 can be unwound and grass can be mowed even with the shortened cord 2.

[0023] The cord 2 is configured such that a hook portion 21 provided at the base end of the cord is hooked on the first fixing portion 12 or the second fixing portion 13. When the cord 2 is pulled toward the tip end, the hook portion 21 hooks on the first fixing portion 12 or the second fixing portion 13. When the cord 2 is pulled toward the base end, the cord 2 is released from the first fixing portion 12 or the second fixing portion 13. In this configuration, when the support portion 11 is rotating, centrifugal force acts toward the tip end of the cord, so that the cord will not unintentionally fall off when the brush cutter is in operation. On the other hand, when the brush cutter is stopped, the centrifugal force is not acting, so that the cord 2 can be easily removed by pulling the cord 2 toward the base end. To attach the cord 2, it is sufficient to insert the tip end of the cord 2 into the first fixing portion 12 or the second fixing portion 13 and pull the cord. Since the cord can be easily attached and detached in this manner, it is easy to adjust the length of the cord or replace it with a new one.

[0024] As shown in FIG. 2, the second fixing part 13 is formed of a ring-shaped member. With this configuration, the cord 2 can easily be extended without bending to the side of the support part 11. This can solve problems that may occur due to disturbance in the protruding direction of the cord 2. The second fixing part 13 is provided on the upper surface of the support part 11. An air flow is generated on the lower surface of the support part 11. Since the second fixing part 13 is provided on the upper surface, not on the lower surface, of the support part 11, the second fixing part 13 does not disturb the air flow. This makes it easier to obtain the lift as designed.

[0025] As shown in Fig. 2, the first fixing part 12 and the second fixing part 13 are provided at positions where the cord 2 is bent when the cord 2 is inserted. The cord 2 is in a bent state due to elastic deformation, and is made of a material having a rigidity that causes it to return to a straight state from the bent state when the bending stress is removed. Therefore, as shown in Fig. 2, the force that causes the cord 2 to return to a straight state presses the cord 2 against the edge of the second fixing part, generating friction. This prevents the cord 2 from being displaced toward the base end and unintentionally falling off the first fixing part 12 or the second fixing part.

[0026] The cord may be any material that can cut grass, and may be made of any material, including, for example, nylon or metal wire.

[0027] In the above example, the first fixing part is a through hole, and the second fixing part is an annular member. The first fixing part or the second fixing part is not limited to this example, and may have any shape that allows the cord to be inserted and the base end to be fixed. Examples of the first fixing part or the second fixing part include a through hole, an annular member, or a recessed groove into which the cord 12 is fitted. FIG. 7 shows an example of a recessed groove 15 into which the cord 12 is fitted. In the example of FIG. 7, the recessed groove 15 is formed in a member having a thickness that allows the recessed groove to be formed. A protrusion is provided at the upper end of the recessed groove 15, which elastically deforms to receive the cord 12 and prevent the cord 12 from falling off.

[0028] The configuration or material of the support part is not limited to the above example. For example, other configurations are possible, such as a plastic disk having projections and recesses for generating lift. In addition, the configuration of the attachment part provided on the support part is not limited to a through hole, and may be any configuration that allows the support part to be attached to the tip of the operating rod. [Explanation of symbols]

[0029] 8 Operating rod 1 Cord holder 11 Support part 2 Code 12 1st fixed part 13 Second fixed part 15 Groove 21 Latch part

Claims

1. This is a cord holder that is attached to the tip of the operating rod of a brush cutter. The cord holder has a support portion, The support portion is shaped to generate lift by rotation, The support portion has a first fixing portion for fixing a base end portion of the cord and a second fixing portion for fixing a middle portion of the cord, the first fixing portion and the second fixing portion are provided at positions shifted from each other in a circumferential direction of the support portion, and are provided at positions where a cord is bent when the cord is inserted through the first fixing portion and the second fixing portion, The cord is configured to be switchable between two states: a state in which a base end of the cord is fixed to a first fixing part and a middle part of the cord is fixed to a second fixing part; and a state in which the base end of the cord is fixed to one of the first fixing part or the second fixing part and is not fixed to the other of the first fixing part or the second fixing part. When the base end of the cord is fixed to a first fixed part and the middle of the cord is fixed to a second fixed part, the rigidity of the bent cord as it attempts to return to a straight shape causes the cord to come into contact with the edge of the second fixed part, thereby preventing the cord from falling off.

2. 2. The cord holder according to claim 1, wherein the second fixing portion is a ring-shaped member provided on the support portion or a recessed groove into which the cord is fitted.

3. 3. The cord holder according to claim 2, wherein the groove for fitting the annular member or the cord is provided on an upper surface of the support portion, when the direction in which the support portion is lifted by a lifting force is defined as "up."

4. The base end of the cord is provided with a hook, When the cord is pulled toward the tip, the hook hooks onto the first fixing part or the second fixing part, 4. The cord holder according to claim 1, wherein the cord is detached from the first fixing part or the second fixing part when the cord is pulled toward the base end.

5. A plurality of lift generating parts are arranged on the outer edge of the support part, the lift generating portion has a shape obtained by bending a plate material, has an arc-shaped convex portion protruding upward, and is inclined in a direction in which the support portion rotates, 2. The cord holder according to claim 1, wherein adjacent lift generating portions are separated by a notch.

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