JP5097969B1 - Mowing blade and mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mowing blade capable of suppressing tangling of grass and an attachment member attached to the mowing blade.
A mowing blade (1) is used by being attached to a mowing machine (3), and has a substantially circular plate-shaped main body portion (11) and a plurality of blade portions (13). The grass cutting blade 1 has a relatively flat periphery around the through-hole 21, but is curved as it goes toward the outer periphery, and has an inclined surface that is inclined downward toward the outer periphery. More specifically, the main body portion 11 is relatively gently curved, and is curved at a relatively steep angle in the vicinity of the connection portion between the main body portion 11 and the blade portion 13.
[Selection] Figure 4

Description

  The present invention relates to a mower that cuts weeds, and more particularly, to a mowing blade having a plurality of blade portions on the outer periphery.

2. Description of the Related Art As a hand-held mower, there is used a handle having an operation handle and a prime mover such as an engine, and a tip portion having a mowing blade driven by the prime mover.
Conventionally, this grass cutting blade has been generally used as a flat plate as a whole and has a plurality of blades formed on the outer periphery. However, the grass cutting blade is configured so that the blade and the entire grass cutting blade are curved upward. Has also been proposed (see Patent Documents 1 and 2).

  In order to suppress the breakage of the blade, a grass cutting blade in which a non-blade portion is formed at the tip of the blade has also been proposed (see Patent Document 3).

JP-A-5-91814 JP-A-6-284809 JP 2001-45833 A

  The conventional grass cutting blade has a problem that the cut grass is easy to ride on the grass cutting blade, and as a result, the grass is easily bitten and entangled. This was not solved by the above Patent Documents 1 to 3.

An object of the present invention is to provide a mowing blade that can suppress tangling of grass.

The invention according to claim 1, which has been made to solve the above-described problem, is a mowing blade for a mower having a plurality of blades on the outer periphery, and the mowing blade has a substantially circular shape in a top view. In addition, the angle between the tip of the blade part and the surface passing through the tip in the outer peripheral direction of at least three blade parts is 30 ° to 60 °. It is a range .

  In the case of the grass cutting blade configured in this way, when the grass cut by the blade portion or the rowed grass comes into contact with the inclined surface of the rotating grass cutting blade, the direction of the outside (radially outward) direction of the grass cutting blade It will be blown by you. As a result, it becomes difficult for the grass to ride on the grass cutting blade, and as a result, the grass can be prevented from getting entangled and the grass mower can get the grass involved.

As for the blade part mentioned above, the protection part in which the blade is not formed may be provided in the edge part of the outer peripheral direction of a mowing blade.

With the grass cutting blade configured in this way, the blade is less likely to come into contact with stones or concrete walls other than grass, so that blade spillage and blade wear can be suppressed.
When providing the protection part mentioned above, you may comprise so that a protection part may protrude ahead rather than a blade.

By comprising in this way, it can suppress more effectively that a blade contacts a stone. Further, the grass can be effectively cut off by guiding the grass to the blade side by the protection unit.
In the case of a configuration in which the protective part protrudes forward from the blade, the protective part guides the grass to the blade side as described above, so that the cut grass tends to gather on the center side of the grass cutting blade. Since the grass cutting blade has an inclined surface, it is possible to suppress the grass from gathering to the center side, and it is possible to simultaneously achieve protection of the blade, effective cutting of the grass, and suppression of tangling of the grass.

In addition, the front of the blade is, in other words, the rotational direction of the mowing blade.
As for the protection part mentioned above, the perimeter may be formed in the shape of a curved surface. By configuring in this way, the impact when contacting a stone or the like can be reduced, so the risk of damage to the protection part is reduced, the stone is not strongly repelled by the rotating grass cutting blade, and the wall of concrete or the like And the like can be prevented from being damaged.

Incidentally, the inclined surfaces described above, that are also formed in blade units described above. If it is the grass cutting blade comprised in this way, since the grass can be blown outside using the part of the blade which cuts grass, it can control effectively that a grass gets entangled.

  In addition, when the blade part is an inclined surface, it becomes easier to approach the ground than when the blade part is planar. Therefore, when the protection part is formed at the tip, it is possible to suppress the mowing blade from being buried in the ground or from being damaged even if it contacts a stone or the like on the ground.

Invention of Claim 4 is a mower provided with the grass-cutting blade of this invention mentioned above .
If it is such a mower, the same effect as the case where the mowing blade of the said Claim 1 is used can be acquired.

It is a top view of a mowing blade. It is a perspective view of a grass cutting blade. It is AA sectional drawing of the grass cutting blade in FIG. FIG. 4A is a side view showing a state in which the mowing blade is attached to the mower, and FIG. 4B is an enlarged view of a connecting portion between the mowing blade and the mower. FIGS. 5 (A) and 5 (B) are photographs showing the state of grass when mowing when the mowing blade of the present invention is used, and FIGS. 5 (C) and 5 (D) are cases where a conventional mowing blade is used. It is a photograph which shows the state of the grass at the time of mowing. It is a typical figure explaining the use condition of a mower. FIG. 7A is a perspective view showing an attachment member, and FIG. 7B is a perspective view showing a flat grass cutting blade. FIG. 8A is a perspective view showing a state in which the attachment member is disposed on the upper surface side of the grass cutting blade, and FIG. 8B is a cross-sectional view taken along the line DD in FIG. 8A. FIG. 9A is a perspective view of a modified example, and FIG. 9B is a cross-sectional view taken along line EE in FIG. 9A.

Embodiments of the present invention will be described below with reference to the drawings.
[Example 1]
(1) Configuration of Mowing Blade The mowing blade 1 of this embodiment is used by being attached to the mowing machine 3 shown in FIG. 4 (A). As shown in FIGS. And a plurality of blade parts 13.

In the center of the main body 11, a through hole 21 is formed that is used when the mowing blade 1 is attached to a drive shaft 35 (described later) of the mower 3.
The blade portion 13 is provided so as to extend outward from the outer periphery of the main body portion 11. In this embodiment, six blade portions 13 are arranged at equal intervals.

  The blade portion 13 is provided with a blade 23 at an end portion on the rotation direction (arrow direction shown in FIG. 1) side, and the blade 23 can cut grass and the like. At the tip of the blade portion 13, that is, the end portion in the outer peripheral direction of the mowing blade 1, a protection portion 25 in which the blade 23 is not formed is provided. The protection part 25 protrudes forward of the blade 23, that is, the rotation direction side. Further, the protective portion 25 is formed in a smooth curved surface whose outer peripheral surface continues from the blade 23.

  FIG. 3 is a cross-sectional view of the cutting blade 1 taken along the line AA in FIG. The grass cutting blade 1 has a relatively flat periphery around the through-hole 21 but is curved as it goes toward the outer periphery, and has an inclined surface that is inclined downward toward the outer periphery. More specifically, the main body portion 11 is a relatively gently inclined surface, and the vicinity of the connecting portion between the main body portion 11 and the blade portion 13 is an inclined surface that curves at a relatively steep angle. The angle of the inclined surface increases with the tip, but the angle C formed by the tip of the blade portion 13 and the plane B through which the tips of the plurality of blade portions 13 pass is formed to be an angle of 60 ° or less. .

(2) Attaching the mowing blade to the mower The mower 3 is shown in FIG. 4A and 4B, the mowing blade 1 is shown in a cross-sectional view for easy understanding. The mower 3 includes an engine 31, a pipe shaft 33, a drive shaft 35, a rotation shaft (not shown) disposed inside the pipe shaft 33, and the like. The engine 31 rotates the rotating shaft inside the pipe shaft 33, and the driving shaft 35 is rotated by the rotating force.

  FIG. 4B shows an enlarged view of a connecting portion between the grass cutting blade 1 and the grass cutter 3. The grass cutting blade 1 is fixed by inserting a fastener 37 and fastening a bolt 39 to the drive shaft 35 with the tip (lower end) of the drive shaft 35 inserted into the through hole 21, and is integrated with the drive shaft 35. It starts to rotate.

  When the engine 31 is driven with the grass cutting blade 1 attached in this way, the rotation shaft and the drive shaft 35 inside the pipe shaft 33 rotate, and the grass cutting blade 1 rotates accordingly, so that weeds and the like can be cut. become able to.

(3) Effect With the grass cutting blade 1 of the present embodiment described above, the grass cutting blade 1 in which the grass cut by the blade 13 or the grass 7 that has been rowed is rotated as shown in FIG. When it comes into contact with the inclined surface, it is ejected in the direction of the outside (radially outside) of the grass cutting blade 1.

Therefore, as a result of the grass becoming difficult to get on the grass cutting blade 1, the grass can be prevented from being entangled and the grass cutter 3 can be prevented from getting caught.
FIGS. 5A to 5D show photographs taken when mowing using an example of the mowing blade of the present invention and when using a conventional flat mowing blade. In the grass cutting blade of the present invention (FIGS. 5A and 5B), it can be seen that the grass is difficult to ride above the grass cutting blade. On the other hand, in the conventional grass cutting blade (FIGS. 5C and 5D), a lot of grass is on the grass cutting blade (particularly on the lower side of the photograph).

  Moreover, the grass cutting blade of the said Example can suppress the blade spill and abrasion of the blade since the blade 23 is less likely to come into contact with stones or concrete walls other than the grass by the protection unit 25. Moreover, since the protection part 25 protrudes ahead, the grass can be effectively reaped by guiding the grass to the blade 23 side by the protection part 25.

  Further, since the outer periphery of the protective part 25 is formed in a curved shape, the impact when contacting the stone or the like can be reduced, the risk of the protective part 25 being damaged is reduced, and the rotating mowing blade 1 is strongly stoneed. It is possible to achieve suppression of being bounced and suppression of damage to walls such as concrete.

  By the way, when weeding weeds near obstacles such as concrete walls and utility poles, it is possible to apply the blade to the weed with the direction of the blade as close to the obstacle as possible (the direction of the blade is close to vertical). desired. As one of the methods, there is a method of raising the pipe shaft 33. In the case of the grass cutting blade 1 of the above embodiment, as shown on the right side of the obstacle 5 in FIG. 6, the blade 23 is inclined downward. Therefore, the angle at which the pipe shaft 33 is set up can be made smaller than the conventional grass cutting blade 9 by the angle, and workability is improved.

When the conventional grass cutting blade 9 is used, as shown on the left side of FIG. 6, even if the pipe shaft 33 is stood up largely, the direction of the blade does not approach so much vertical, and workability is poor.
In addition, it can suppress that a blade hits the obstruction 5 by making a blade into the direction close | similar to a parallel with the obstruction 5, and it can suppress that a blade hits the obstruction 5, and weed 7 by hitting a blade from multiple directions. Can be cut efficiently.

  By the way, although the workability in the vicinity of the obstacle is improved because the blade is inclined downward as described above, the mowing efficiency on the flat ground is lowered when the inclination angle is too large. Therefore, the grass cutting blade 1 is good to make the angle C which the front-end | tip of the blade part 13 and the plane B shown in FIG. 3 make into the range of 30-60 degrees. By setting the inclination angle in such a range, the grass cutting efficiency can be kept high while the grass is blown off on the inclined surface to suppress tangling, and the workability in the vicinity of the obstacle can be improved. In the case where emphasis is placed on improving workability in the vicinity of an obstacle, the range is preferably 45 to 60 °.

  Of course, even if the inclination angle is 30 ° or less, the entanglement of the grass can be suppressed if the inclined surface is formed. Even if the inclination angle exceeds 60 °, the mowing can be performed while suppressing the tangling of the grass, although the efficiency of mowing is slightly inferior.

[ Reference Example 1 ]
(1) Configuration of Mounting Member The mounting member 51 of the present reference example is used by being mounted on the mower 3 shown in FIG. 4, and as shown in FIG. And an inclined portion 55 connected to the outer periphery of the base portion 53. As the grass cutting blade used in the grass cutter 3, for example, a flat grass cutting blade 61 shown in FIG. 7B can be used, but the invention is not limited to this, and can be applied to various shapes of grass cutting blades. . A through hole 63 is formed in the grass cutting blade 61 and can be connected to the rotating shaft of the mower 3 using the through hole 63.

  The base 53 of the attachment member 51 has a hole 57 at the center. The hole 57 has substantially the same shape as the through-hole 63 of the grass cutting blade 61. When the mounting member 51 is disposed on the upper surface side of the grass cutting blade 61, as shown in FIG. It is configured so that it can be positioned along the through hole 63, that is, at a position where the hole 57 and the through hole 63 overlap.

The inclined portion 55 has an inclined surface 55 a that is inclined downward toward the outer periphery of the grass cutting blade 61.
The attachment member 51 has a diameter smaller than the diameter of the mowing blade 61 as a whole.
(2) Attaching the attachment member to the grass cutter When attaching the attachment member 51, the hole 57 of the attachment member 51 is removed in a state where the grass cutting blade 61 is removed from the grass cutter 3, that is, a state where it is removed from the drive shaft 35. Then, the drive shaft 35 is passed through, and then the drive shaft 35 is passed through the through-hole 63 of the mowing blade 61 and fixed using the fasteners 37 and the bolts 39. The state of attachment in this way is shown in FIG.

  The attachment member 51 is sandwiched and fixed by the fasteners 37 and the bolts 39 while being superposed on the grass cutting blade 61. Therefore, the attachment member 51 is connected to the grass cutting blade 61 and rotates integrally.

(3) Effect When the mounting member 51 described above is used by being attached to the mowing machine 3, the mowing grass is prevented from riding on the upper portion of the mowing blade as in the case of the mowing blade 1 described in the first embodiment. It is possible to prevent the grasses from getting entangled and the mower 3 engulfing the grass.

Further, the attachment member 51 of the reference example 1 has a through-hole 21 and a hole 57 with the attachment member 51 overlapped with the mowing blade 61 with respect to the mowing blade 61 fixed to the mower 3 using the through-hole 63. Can be attached to the mower 3 by overlapping.

  That is, a part or the like for attaching the attachment member 51 becomes unnecessary, and attachment can be performed easily. Further, a conventional mower can be attached later if the mowing blade has a through hole for fixing to the mower.

[Modification]
As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention can take a various form, as long as it belongs to the technical scope of this invention, without being limited to the said Example at all.

  For example, in the first embodiment, the configuration in which the outer periphery of the main body portion 11 and the blade portion 13 form an inclined surface is exemplified, but the inclined surface is formed in any one of the main body portion 11 and the blade portion 13. Just do it. In addition, if the blade part 13 is the structure which comprises the inclined surface like the said Example 1, since the cut grass can be immediately blown outside, it can suppress effectively that a grass gets entangled.

Similarly, with respect to the attachment member 51 shown in the reference example 1 , the position where the inclined surface is formed is not limited to the position shown in the reference example 1 .
In the reference example 1 , the hole 57 is overlapped with the through-hole 63 and fastened with the bolt 39 to fix the attachment member 51 so as to rotate integrally with the grass cutting blade 61. The structure which fixes the member 51 may be sufficient. For example, the structure which fixes using the fixing tools (a volt | bolt, a fastener, a clamp, etc.) for fixing the attachment member 51 to the mowing blade 61 may be sufficient. Further, the attachment member 51 may be configured to be fixed to the drive shaft 35.

  Moreover, the structure provided in the groove part 75 dented in the downward direction may be sufficient like the mowing blade 71 shown to FIG. 9 (A), (B). Thus, by dropping the blade 73 from the periphery and forming it into a groove shape, the blade 73 can easily hit the weed, and the weed can be efficiently cut.

DESCRIPTION OF SYMBOLS 1 ... Mowing blade, 3 ... Mowing machine, 5 ... Obstacle, 7 ... Weed, 9 ... Mowing blade, 11 ... Body part, 13 ... Blade part, 21 ... Through-hole, 23 ... Blade, 25 ... Protection part, 31 ... Engine, 33 ... Pipe shaft, 35 ... Drive shaft, 37 ... Fastener, 39 ... Bolt, 51 ... Mounting member, 53 ... Base, 55 ... Inclined portion, 55a ... Inclined surface, 57 ... Hole, 61 ... Mowing blade, 63 ... Through hole, 71 ... Mowing blade, 73 ... Blade, 75 ... Groove

Claims (4)

A mowing blade for a mower having a plurality of blades on the outer periphery,
The mowing blade has a substantially circular shape in a top view and a curved shape that curves downward toward the outer periphery ,
The grass cutting blade characterized in that an angle formed between the tip of the blade and a surface passing through the tips of the at least three blades in the outer circumferential direction is in a range of 30 ° to 60 ° . The grass cutting blade according to claim 1, wherein the blade portion is provided with a protection portion on which an edge is not formed at an end portion in an outer peripheral direction of the grass cutting blade. The mowing blade according to claim 2, wherein the blade portion is configured such that the protection portion protrudes forward of the blade. A mowing machine comprising the mowing blade according to any one of claims 1 to 3 .