JP3201098U - Lawn mower and entanglement prevention tool for mower - Google Patents

Abstract

A mowing machine that is durable and that can effectively prevent entanglement of mowing grass is provided. An anti-tangler blade 42 having a cutting edge line extending along a rotation direction of a rotary blade 20 is attached to a side surface of a joint member 13 to a handle shaft 10 of a mower so as to be swingable. It was brought into sliding contact with the board surface. Even when the rotary blade 20 is rotating with a large amount of grass cut on the board surface, the tangle prevention blade 42 is swung by being pushed by the grass from the rear in the rotation direction, and the grass on the board surface is swept away. be able to. [Selection] Figure 2

Description

  The present invention relates to a mowing machine that can prevent mowing grass from being entangled with a rotary blade and a shaft, and an entanglement preventing tool.

A mower with a rotary blade that rotates horizontally with the ground and cuts the grass, the cut grass gets entangled with the shaft and rotary blade, the rotational speed decreases, and high frictional heat is applied to the rotation transmission bearings and bearings. There was a problem that occurred.
For this reason, a mowing machine has been proposed in which a tangling prevention tool for cutting grass or the like entangled with a rotary blade is attached to a handle shaft.

  Patent Document 1 discloses a mower having a blade for preventing entanglement attached to a rotary blade at the lower end of the handle shaft, in which a blade tip extends toward the surface of the rotary blade. This mowing machine, by attaching the entanglement prevention blade so that the blade line is obliquely directed to the vertical direction of the surface of the rotary blade, the mowing grass to be wound around the rotating body is raised along the blade line, It is designed to be cut efficiently by increasing the amount of rubbing against the entanglement preventing blade.

  Patent Document 2 discloses a mower having a tangling prevention blade attached to a handle shaft at a predetermined angle so that the blade edge faces the rotation direction of the rotary blade. A V-shaped notch is provided at one end of the entanglement preventing blade, and a blade edge is formed on one side thereof.

JP 2007-60958 A Utility Model Registration No. 2527202

However, each mower has anti-tangler blades so that the cutting edge line is directed to the surface of the rotary blade, so if you want to cut a lot of long stretched grass, cut all the entangled grasses. It was not possible, and there was a case in which the mowing grass entered the gap between the rotary blade and the shaft and entangled.
In particular, in the mower of Patent Document 2, since the cutting edge line extends so as to face the rotation direction of the rotary blade, the amount of scrubbing of the mowing grass against the entanglement preventing blade is excessive, and often entangles without being cut. For this reason, the durability as a mower is low, and damage to the rotary blade and the entanglement preventive device frequently occurs.

  Therefore, an object of the present invention is to provide a mowing machine that is durable and can effectively prevent entanglement of mowing grass, and an entanglement preventing tool used therefor.

  In order to solve the above-mentioned problems, the present invention is a mower that includes a handle shaft provided with an electric rotating device and a rotary blade that rotates horizontally with the ground to cut grass. An entanglement preventing blade whose blade edge line extends along the rotation direction of the rotary blade is swingably attached to the side surface of the shaft, and the blade edge portion of the entanglement blade is brought into sliding contact with the surface of the rotary blade. To do.

In this case, the handle portion of the handle shaft is attached to the rotary blade via a joint member, and the entanglement prevention blade guards the invasion of the mowing grass to the boundary portion with the shaft hole of the rotary blade. It may be attached to the side surface of the joint member via a guard member.
In this case, a V-shaped notch is provided in the guard member, a first guard portion is formed along the upper surface of the boss portion around the shaft hole of the rotary blade on one side of the notch, and the outer peripheral surface is formed on the other side. You may form the 2nd guard part in alignment with.

Further, the present invention is an anti-tangler that is attached to a side surface of a handle shaft of a mower, and is attached to the handle shaft and swingably attached to the attachment member, and is attached to a lower end portion of the handle shaft. The anti-tangler blade whose blade edge line extends along the rotation direction of the provided rotary blade is characterized in that it is configured.
In this case, a V-shaped notch is provided in the lower end portion of the mounting member, and a first guard portion is formed on one side of the notch along the upper surface of the boss portion around the shaft hole of the rotary blade. The second guard portion along the outer peripheral surface may be formed.

In the mower according to claim 1, since the anti-tangler blade whose blade edge line extends along the rotation direction of the rotary blade is swingably attached to the side surface of the handle shaft, it rotates in a state where a large amount of mowing grass is placed on the board surface. Even when the blade is rotating, the entanglement preventing blade is swung by being pushed by the mowing grass from the rear in the rotation direction, and the mowing grass on the board surface can be swept away.
Since the grass cut away from the board surface is released by the high-speed rotation of the rotary blade, there is no room for the grass to enter between the rotary blade and the shaft. This prevents entanglement of the mowing grass, reduces the rotation speed, reduces the load on the motor and the rotating blade, and improves the durability of the mowing machine.

In the invention according to claim 2, in the mower having a structure in which the handle shaft is attached to the rotary blade via the joint member, the entanglement preventing blade is attached to the joint member via the guard member. It is possible to guard the approach of the mowing grass to the boundary part.
Thereby, the entanglement of the cut grass can be effectively prevented.

The mower according to claim 3 is a mower structured to be attached to the joint member via the boss portion of the rotary blade, wherein the guard member is provided with a V-shaped notch, and the boss portion around the shaft hole of the rotary blade on one side thereof Since the 1st guard part along the upper surface of this was formed, and the 2nd guard part along the outer peripheral surface was formed in other one side, it can prevent that a mowing grass enters between a boss | hub part and a joint member.
Moreover, not only the grass cut on the surface of the rotary blade can be removed with the anti-tangler blade, but also the grass that tries to get into between the boss part and the joint member can be removed, so that the entanglement of the grass is more effective. Can be prevented.

In the invention according to claim 4, the anti-tangler is configured by swingably attaching an anti-tangler blade having a structure in which the cutting edge line extends along the rotation direction of the rotary blade to the attachment member for attaching to the handle shaft. . By attaching this to an existing mower, the entanglement of the mowing grass on the rotary blade or shaft can be prevented, and the durability of the mower can be increased.
That is, when the rotary blade is rotating with a large amount of mowing grass on the board surface, the entanglement prevention blade swings by being pushed by the mowing grass from the rear in the rotation direction, so that the mowing grass on the board surface is gradually removed. Can do. For this reason, it becomes difficult for mowed grass to enter between the rotary blade and the shaft, and entanglement of the rotary blade and the shaft is prevented.

  The entanglement preventing tool for a mower according to claim 5 is provided with a V-shaped cutout at a lower end portion of the mounting member, and a first guard portion disposed along the upper surface of the boss portion around the shaft hole of the rotary blade. Since the second guard portion disposed along the outer peripheral surface is formed, in the mower having the structure of being attached to the joint member via the boss of the rotary blade, the mowing grass enters between the boss and the joint member. Can be effectively prevented.

It is a perspective view which shows the mower which concerns on this embodiment. It is a perspective view which shows the entanglement prevention tool attached to the said mower. It is a perspective view which shows the joint member before a tangle prevention tool is attached. It is sectional drawing which shows the state in which a rotary blade is attached to a joint member. It is a perspective view which shows an example of a rotary blade. It is a perspective view which shows the guard member of the said entanglement prevention tool. The state which looked at the tangle prevention tool attached to the said mower from the top was shown, (a) is a top view which shows the state which withdraws the mowing with a guard member, (b) is the state with which it replies with a tangle prevention blade FIG. It is a side view which shows the state by which the cut grass on a board surface is dispelled by the said entanglement prevention blade, (a) shows the state in which the rotary blade is rotating in the state where a large amount of cut grass was mounted on the board surface, (b) The state where the entanglement preventing blade is swung by being pushed by the mowing grass from the rear in the rotation direction is shown. It is a perspective view which shows the 1st modification of the said entanglement prevention tool. It is a side view which shows the 2nd modification of the said entanglement prevention tool, (a) shows the state which the blade edge | tip part of an entanglement prevention blade slidably contacts with a board surface, (b) shows the state which an entanglement prevention blade rock | fluctuates. It is a side view which shows the 3rd modification of the said entanglement prevention tool, (a) shows the state which the blade edge | tip part of an entanglement prevention blade slidably contacts with a board surface, (b) shows the state which an entanglement prevention blade rock | fluctuates. It is a front view which shows the 4th modification of the said entanglement prevention tool. It is a side view which shows the 5th modification of the said entanglement prevention tool, (a) shows the state which the blade edge | tip part of an entanglement prevention blade slidably contacts with a board surface, (b) shows the state which an entanglement prevention blade rock | fluctuates. It is a side view which shows the 6th modification of the said entanglement prevention tool. It is a side view which shows the 7th modification of the said entanglement prevention tool.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a mower 1 according to an embodiment of the present invention.
The mower 1 according to the present embodiment is configured by attaching a entanglement prevention tool 40 shown in FIG. 2 to a general-purpose mower made of a handle shaft 10, a rotary blade 20, and a power unit 30. is there.

The handle shaft 10 includes an operation handle 11, a handle portion 12, and a joint member 13.
The operation handle 11 is configured by providing a handle on an arm provided at an intermediate portion of the handle portion 12. A drive switch 31 for the rotary blade 20 is provided in the vicinity of the handle.

The handle portion 12 is a long pipe member, and the power device 30 is attached to the upper end portion, and the rotary blade 20 is rotatably attached to the lower end portion via the joint member 13.
The joint member 13 is inclined from the shaft portion 14 and the shaft portion 14 inserted perpendicularly to the shaft hole of the rotary blade 20 so that the handle portion 12 can be attached to the rotary blade 20 in an inclined manner. And an extending attachment portion 15 (see FIG. 3).

That is, the shaft portion 14 is supported via the inclined attachment portion 15 of the joint member 13 so as to be perpendicular to the ground, and is inserted into the shaft hole of the rotary blade 20 at the lower end.
In this case, as shown in FIG. 4, the rotary blade 20 is rotatable with respect to the shaft portion 14 by receiving the shaft portion 14 inserted into the shaft hole with a lid 21 that fixes the rotary blade 20 from below. It is attached.

The lid 21 has a built-in drive motor 32 for rotating the rotary blade 20.
In other words, a cylindrical boss 22 is formed at the rising portion around the shaft hole of the rotary blade 20, and the outer peripheral surface of the shaft portion 14 of the joint member 13 is in sliding contact with the inner peripheral surface thereof. 20 is structured to be rotated at high speed by the drive motor 32.

The rotary blade 20 is rotated in the direction A in the figure in a state where the board surface is horizontal with respect to the ground.
As shown in FIG. 5, the board surface of the rotary blade 20 is provided with a number of through holes for reducing the weight, and the cutting blades are formed in an uneven shape around the board surface. The cutting edge 23 of the convex portion (that is, the unit blade) of the cutting blade protrudes in the rotation direction A.

A power unit 30 is provided at the upper end of the handle shaft 10 (see FIG. 1).
The power unit 30 is electrically connected to a switch 31 provided on the operation handle 11 and a drive motor 32 provided on the lower end of the handle shaft 10, and receives an input signal from the switch 31, The drive motor 32 is driven and the rotary blade 20 is rotated.

The joint member 13 at the lower end of the handle shaft is screwed to the handle portion 12 via a bolt hole 16 provided on the side surface of the attachment portion 15 (see FIG. 2).
By using this bolt hole 16, the entanglement preventing tool 40 for the mower according to the present invention is detachably attached to the general-purpose mower 1 described above.
The entanglement preventing tool 40 is for preventing the mowing grass from being entangled with the rotary blade 20 or the shaft 10 of the mower 1, and is constituted by a guard member 41 as an attachment member and an entanglement prevention blade 42. .

The guard member 41 is used to fix the entanglement preventing blade 42 to the joint member 13 and to guard the cutting grass from entering the gap between the rotary blade 20 and the joint member 13. Are arranged in an inclined manner toward the surface of the rotary blade 20.
That is, the guard member 41 is attached at a predetermined angle with respect to the surface of the rotary blade 20 in an inclined state downward in the rotation direction A, like the attachment portion 15 of the joint member 13.

The guard member 41 is attached to the bolt hole 16 of the joint member 13, but a V-shaped notch is provided at an end portion on the side not attached to the joint member 13 (see FIG. 6).
The V-shaped notch is for covering a region from the shaft portion 14 to the outer peripheral surface of the boss 22, and the first notch along the upper surface of the boss 22 around the shaft hole of the rotary blade 20 on one side of the notch. A guard portion 44 is formed, and a second guard portion 45 is formed along the outer peripheral surface of the boss 22 on the other side.

The first guard portion 44 extends the cutting edge so as to reach the shaft portion 14 from the upper surface of the boss 22, thereby guarding the cutting grass from entering the boundary portion between the boss 22 and the shaft portion 14.
That is, as shown in FIG. 7, the cutting edge line of the first guard portion 44 extends in the same direction as the rotation direction A of the rotary blade 20, and the rotary blade at the eccentric position as the rotary blade 20 rotates. It is designed to dispel the mowing grass on the upper surface of the boss 22 by moving relative to the boss 20.

The second guard portion 45 extends the cutting edge line downward from the base portion of the first guard portion 44 along the outer peripheral surface of the boss 22 toward the surface of the rotary blade 20, thereby rotating the rotational direction A of the rotary blade 20. You can guard the mowing grass from behind.
In the vicinity of these guard portions 44 and 45, a hole (attachment portion 46) for attaching the entanglement preventing blade 42 is provided (see FIG. 6).

The entanglement preventing blade 42 is swingably attached via the attachment portion 46 of the guard member 41 (see FIG. 2).
The entanglement preventing blade 42 is for wiping away the grass cut on the surface of the rotary blade 20 toward the peripheral portion, and is disposed in an inclined manner toward the surface of the rotary blade 20, and the lower edge of the blade edge portion is disposed on the surface of the disk. In sliding contact. The cutting edge line at the lower end extends in the rotation direction A of the rotary blade 20 and projects the tip at an acute angle.

By attaching the entanglement preventing blade 42 having such a shape to the guard member 42 so as to be swingable, it is possible to smoothly slide on the board surface as the rotary blade 20 rotates. Further, by extending the cutting edge line in the tangential direction of rotation, it becomes possible to smoothly drive the cut grass on the board surface to the peripheral part.
Particularly, since the entanglement preventing blade 42 swings in the rotation direction A, when a large amount of cut grass is placed on the board surface, the cut grass can be left on the board surface (see FIG. 8). .

That is, when a large amount of mowing grass is placed on the board surface, the entanglement blade 42 is allowed to pass through with the mowing grass remaining, instead of forcibly wiping or cutting the mowing grass.
In this way, a gap for allowing the grass to pass through is formed between the blade surface and the cutting edge, and the grass can be gradually withdrawn every time the rotary blade 20 rotates. Since the grass is removed little by little at every rotation and is completely discharged by high-speed rotation, it is possible to prevent the grass from stagnating on the surface of the rotary blade 20 and to prevent the shaft from becoming entangled (see FIG. 8).
The usage state of the mower 1 having the above configuration will be described.

First, the rotary blade 20 of the mower 1 is rotated horizontally with respect to the ground to mow the grass. At this time, the cut grass is scattered in all directions by centrifugal force.
The scattered grass is sometimes directed toward the center of the rotary blade 20 from the rear in the rotational direction, but the cutting edge line is formed on the side surface of the handle shaft 10 along the rotational direction A of the rotary blade 20. Since the entanglement preventing blade 41 that extends is provided, the mowing grass on the surface of the rotary blade 20 can be swept away.

When a large amount of mowing grass is on the board surface, the entanglement preventing blade 42 is pushed by the mowing grass from the rear in the rotation direction and swings in the rotation direction A. Thereby, the entanglement preventing blade 42 can be slid in a state where the grass is left between the entanglement preventing blade 42 and the board surface. The mowing grass is wiped out little by little and is completely released by high-speed laps.
In this way, the rotary blade 20 and the shaft 10 can be prevented from being entangled with the cut grass.

  In particular, in the entanglement preventing device 40 of this embodiment, in the mower 1 having a structure in which the handle shaft 10 is attached to the rotary blade 20 via the joint member 13, the entanglement preventing blade 42 is connected to the joint member via the guard member 41. 13, at the lower end of the guard member 41, it is intended to guard the approach of the mowing grass to the boundary portion between the rotary blade 20 and the hand member 13. Guarding by the guard member 41 becomes possible.

  That is, as in this embodiment, in the mower 1 having a structure that is attached to the joint member 13 via the boss 22 of the rotary blade 20, one side of the guard member 41 that is notched in a V shape (ie, the side) The first guard portion 44 whose blade edge extends substantially horizontally in the tangential direction of rotation is brought into slidable contact with the upper surface of the boss 22 and the second guard portion whose blade edge extends downward in the other vertical direction (ie, substantially vertically downward). 45) is substantially slidably contacted with the outer peripheral surface of the boss 22, so that the grass cut around from behind can be efficiently guarded.

In other words, the grass cut around from behind is first guarded by the second guard portion 45, and the grass cut trying to enter the upper surface of the boss 22 through the notch gap is guarded by the first guard portion 44. The mowed grass can be prevented from being driven to the peripheral portion of the board surface and being pinched by the boundary portion between the boss 22 and the shaft portion 14 (see FIG. 7A).
The mowing grass driven to the periphery of the board surface is further swept away by the entanglement prevention blade 41.
At this time, the cutting edge of the entanglement preventing blade 41 extends in the same direction as the rotation direction A of the rotary blade 20 (that is, the same direction as the moving direction of the mowing grass), so that the mowing grass approaching from the rear is being pulled forward. To the peripheral part (see FIG. 8).

  In other words, the entanglement preventing blade swings forward due to the pressing force of the mowing grass, and this swaying allows the cutting grass to be cut or passed under the entanglement preventing blade. However, even if it is a case where it draws in a large amount toward the blade edge, the mowing grass can be driven to the peripheral portion little by little as the rotary blade 20 rotates. Since the rotary blade 20 is rotated at a high speed in such a state, the cut grass is completely removed from the board surface, and there is no room for tangling to the shaft portion 14.

The entanglement preventing tool for a mower according to the present invention is sold as a tool attached to the handle shaft 10 of the mower, but the method of attaching the handle shaft 10 to the handle shaft 10 may be any mode.
For example, like a mower entanglement prevention tool 40 ′ shown in FIG. 9, the attachment member to the handle shaft 10 may be a clip 47 made of a leaf spring so that it can be directly fixed to the handle portion 12. The guard member 41 is fixed to the clip 47, and the entanglement prevention blade 42 is swingably attached to the guard member 41.

Further, unlike the entanglement preventing tool 140 shown in FIG. 10, the entanglement preventing blade 142 may be swingably attached directly to the inclined attachment portion 46 without providing a guard member. In this case, by providing a V-shaped notch on the side edge of the entanglement preventing blade 142, a first guard 144 for guarding the upper surface of the boss 22 and a second guard for guarding the outer peripheral surface. The portion 145 can be formed.
The entanglement preventing tool 140 also causes the entanglement preventing blade 142 to swing forward by the pressing force from the rear of the mowing grass on the surface of the rotary blade 20, and this swinging allows the mowing grass to pass under the entanglement preventing blade 142. be able to.

Moreover, like the entanglement prevention tool 240 shown in FIG. 11, you may apply to the rotary blade 220 which does not have a boss | hub in an axial center part. In this case, the shape of the entanglement preventing blade 242 is appropriately designed according to the shape of the joint member 213.
When used for the rotary blade 220 having a structure not having a boss, the guard member 341 extends to the vicinity of the board surface as in the entanglement prevention tool 340 shown in FIG. It may be prevented together with the anti-tangler blade 342 that mowing grass enters between them.

Further, the guard member 341 may be swingably attached to the bolt hole 316 of the joint member 313.
The guard member 341 in this case is also designed so that the cutting edge line extends along the rotation direction A, like the cutting edge line of the entanglement preventing blade 342, and the lower end portion of the guard member 341 is brought into sliding contact with the surface of the rotating blade 220. Is preferred.

Moreover, like the guard member 441 of the entanglement prevention tool 440 shown in FIG. 13, the rear end of the lower end portion may be rounded, and the region from the front end portion to the rear end portion in the rotation direction A may be a curved knife shape. .
In this way, by making the rear end portion of the cutting edge line slidably contacted with the surface of the rotary blade 220 into a round shape, it is possible to cut while drawing the cut grass from the rear, and cut the long cut grass finely. However, it is possible to drive it out of the disk.

  Furthermore, it is good also as the guard member 541 substantially slidably contacted only to the upper surface of the boss | hub 22 like the entanglement prevention tool 540 shown in FIG. 14, and the boss | hub 22 or shaft part like the entanglement prevention tool 640 shown in FIG. It is good also as the guard member 641 in which the blade edge line was formed along 14 shape.

  The present invention can be applied to a mower used for farm work, cleaning work at home or in a park, and the like.

DESCRIPTION OF SYMBOLS 1 ... Mower 10 ... Handle shaft 11 ... Operation handle 12 ... Handle part 13, 213, 313 ... Joint member 14, 314 ... Shaft part 15 ... Mounting part 16, 316 ... Bolt hole 20, 220 ... Rotary blade 21 ... Cover 22 ... Boss 23 ... Cutting edge 30 ... Power unit 31 ... Switch 32 ... Drive motors 40, 140, 240, 340, 440, 540, 640 ... Tangle prevention devices 41, 341, 441, 541, 641 ... Guard members 42, 142, 242 342 ... Tangle prevention blades 44, 144, 145 ... first guard part 45 ... second guard part 46 ... mounting part 47 ... clip

Claims (5)

A mower (1) comprising a handle shaft (10) provided with an electric rotating device (30) and a rotary blade (20) that rotates horizontally with the ground to cut grass,
An anti-tangler blade (42) having a cutting edge extending along the rotational direction (A) of the rotary blade (20) is attached to the side surface of the handle shaft (10) so as to be swingable. A mowing machine characterized in that a cutting edge portion is brought into sliding contact with a surface of the rotary blade (20). The handle portion (12) of the handle shaft (10) is attached to the rotary blade (20) via a joint member (13),
The entanglement preventing blade (42) is attached to the side surface of the joint member (13) via a guard member (41) for guarding the invasion of the cut grass into the boundary with the shaft hole of the rotary blade (20). The mower according to claim 1, wherein   The guard member (41) is provided with a V-shaped notch, and a first guard part (44) is formed along the upper surface of the boss part (22) around the shaft hole of the rotary blade (20) on one side of the notch. The mower according to claim 2, wherein the second guard part (45) is formed along the outer peripheral surface on the other side. An anti-tangler (40) attached to the side of the handle shaft (10) of the mower (1),
An attachment member (41) to the handle shaft (10);
An anti-entanglement blade (42) attached to the attachment member (41) so as to be swingable and having a cutting edge line extending along the rotation direction (A) of the rotary blade (20) provided at the lower end portion of the handle shaft (10). )When,
An anti-tangler for a mower characterized by comprising A V-shaped cutout is provided at the lower end of the mounting member (41), and a first guard portion (on one side of the cutout) along the upper surface of the boss portion (22) around the shaft hole of the rotary blade (20) ( 44), and the second guard portion (45) along the outer peripheral surface is formed on the other side.