JP6737742B2 - Linear cutter head for mowers - Google Patents

Description

The present invention relates to a head provided with a linear cutter for a mower.

Conventionally, general mowers include a cutting blade type using a rotary blade plate such as a tip saw and a linear cutter type using a synthetic resin cord such as a nylon cord. In the linear cutter type, as shown in Patent Document 1, a cutter mower that is rotationally driven is equipped with a nylon cord that projects outward, and a grass mower that performs cutting work such as grass by rotating the nylon cord is used. Are known.

Further, in the mowing machine, the cut grass particles may become entangled with the work rod and become unrotatable, so that the mowing work may not be performed. For this reason, as shown in Patent Document 2, an auxiliary cord plate having auxiliary nylon cords projecting around it is installed on the upper surface of the main cord board that pulls out the main nylon cord from the peripheral surface portion, and is attached to the auxiliary cord board. There is known a mower that eliminates the entanglement of grass grains on a work rod by using an auxiliary cord.

Utility model registration No. 3165107 JP 2006-111A

Cutting grass could be entangled in the upper part and the periphery of the head for a mower, and it was not possible to cut effectively with the main cutter alone. In the mower shown in Patent Document 2, since the main nylon cord provided on the main chord board and the auxiliary cord provided on the auxiliary chord board are separately provided, the cords must be attached respectively to the main chord board and the auxiliary chord board. No, it takes time.

In view of the above-mentioned drawbacks of the conventional technique, the head for the mowing machine is provided with an auxiliary cutter in addition to the main cutter for the linear cutter, and cuts the mowing grass entwined with the upper part and the periphery of the head for the mowing machine to smoothly mow It is preferable. In addition, the main cutter and the auxiliary cutter are not separated, but are attached by a single linear cutter for easy replacement, and mowing grass is not entangled in the rotating part such as the drive connection part. An object is to provide a linear cutter type head for a machine.

A linear cutter type head for a mower of the present invention is detachably attached to a tip of a drive connecting portion and includes a rotating body that is rotated by the drive connecting portion and a linear cutter made of synthetic resin, A head for a mower in which a linear cutter protrudes to the outside of the body, wherein the rotating body has a lead-out hole opened to an outer wall rising from a peripheral edge and a box-like shape continuous from the outer wall and rotating from the lead-out hole. The linear cutter having an insertion portion formed with a curved surface having a small radius at the front in the direction of rotation and a large radius at the rear of the rotation direction, and an insertion hole and a projecting hole opened side by side in the inner wall of the central portion in the horizontal direction. includes a main cutter protruding from the outer wall, an auxiliary cutter projecting from said inner wall, said and main cutter and the auxiliary cutter, Ri Do from one linear cutter, said one linear cutter One end of which is the main cutter which is guided by the insertion portion and protrudes outward from the lead-out hole, and the other end of which is inserted into the inside of the central portion through the insertion hole, and further protrudes outside the central portion through the protruding hole. Also, the auxiliary cutter is characterized in that the upper edge of the outer wall is located above the projecting hole, and the tip of the auxiliary cutter is projected above the rotating body by the upper edge .

Further, in addition to the above configuration, it is preferable that the auxiliary cutter has a length that allows the auxiliary cutter to project from at least the central portion toward the outside of the rotating body.

Furthermore, in addition to the above structure, it has a plate-like guard in a central portion, the guard preferably has a projecting piece formed radially so as to protrude in addition part fraction insertion portion is disposed.

According to the invention described in claim 1, the main cutter protruding from the outer diameter and the auxiliary cutter arranged inside cut the cutting grass that has entered the inside of the rotating body, so that the cutting grass is entangled with the drive connection shaft. It can be prevented. The main cutter and auxiliary cutter can be attached and replaced together by simply attaching the linear cutter to the rotating body. Since the upper edge of the outer wall of the rotating body is located above the base end portion of the auxiliary cutter, the tip of the auxiliary cutter can be directed upward. Therefore, it is possible to cut the grass above the head where the grass is entangled easily. Also, one linear cutter can be used as both the main cutter and the auxiliary cutter by the mounting method in which the other end of the linear cutter is inserted from the insertion hole to the inside of the central portion and further protruded from the protruding hole to the outside of the central portion. At the same time, it can be firmly held. Further, conventionally, it is not necessary to use a locking tool that separately constitutes a retainer of the main cutter, but it is not necessary to use this.

Further, according to the invention described in claim 2, the auxiliary cutter has a length that allows the auxiliary cutter to project from the central portion to the outside of the rotating body, thereby cutting grass or the like that is about to enter the accommodation space or the like arranged on the outer periphery of the central portion. be able to. Further, since the linear cutter has a predetermined hardness but is also flexible, it can cut the grass around the head even if it is deformed by rotation.

Further, according to the third aspect of the present invention, the head has the guard, so that it is possible to prevent cutting grass and foreign matter from entering the accommodation space. Furthermore, it is not only easy for the user to pass the linear cutter through the lead-out hole, the insertion hole, and the projecting hole, but also there is no projecting piece at that part, so that the grass is going to enter the storage space. Can be cut with.

It is an exploded perspective view showing an example of a linear cutter type head for mowing machines concerning an embodiment of the present invention. The head of FIG. 1 is shown, (a) is a top view and (b) is a bottom view. The head of FIG. 2 is shown, (a) is a side view and (b) is a BB sectional view. The area|region A of the linear cutter of the head of FIG. 2 is shown, (a) is one form which has a shark tooth-shaped blade, (b) is one form which has a spiral blade.

Embodiments of the present invention will be described in detail with reference to the drawings. The linear cutter type head 1 for a mower according to the present embodiment is used by being connected to a drive body provided with a gripping portion and a drive connecting portion 91 for transmitting a rotational driving force. The drive main body other than the connecting portion 91 is omitted.

As shown in FIGS. 1 and 2, the head 1 of the present embodiment is attached to the lower end of the drive connection portion 91 via an attachment tool 92 and a washer 93. The head 1 is composed of a rotating body 10 which is rotated by a drive connecting portion 91 and two or more linear cutters 2 made of synthetic resin. The linear cutter 2 is used as a main cutter 22 led out from the outer diameter of the rotating body 10 and an auxiliary cutter 23 protruding from the central portion 3 of the rotating body 10.

The rotating body 10 has a circular cup shape composed of a substantially conical bottom surface 14 and an outer wall 12 rising from the peripheral edge of the bottom surface 14, and the central portion projecting in a substantially cylindrical shape at the center on the upper surface side of the bottom surface 14. 3 is formed. The central portion 3 is opened in the center of the central flat portion 31, and a central opening portion 32 for connecting to the drive connecting portion 91 and an inner wall 33 extending from the peripheral edge of the central flat portion 31 to the upper surface of the bottom surface 14 are formed. Although the rotating body 10 is made of metal in this embodiment, it may be made of hard resin or other material.

As shown in FIG. 1, the outer wall 12 of the rotating body 10 continuously rises from the lower edge to the upper edge of the outer edge of the bottom surface 14 (see FIG. 2), and the bottom surface 14 is tapered and inclined from the lower end to the center of the outer wall 12. (See FIG. 3A). When using a mower using this head 1, the rotating body 10 is rotated by a driving force such that the curved bottom surface 14 is in contact with the ground, and the main cutter 22 and the auxiliary cutter arranged on the rotating body 10 are rotated. According to 23, the grass is cut and used.

The rotating body 10 has a doughnut-shaped accommodation space 15 between the outer wall 12 and the inner wall 33. The accommodating space 15 can accommodate the linear cutter 2 when not in use. A central plane portion 31 is provided around the central opening portion 32 of the central portion 3, and the guard 4 having a plurality of projecting pieces 41 radially is arranged in the central plane portion 31. The guard 4 partially shields the upper part of the rotating body 10. The projecting piece 41 has a predetermined width in the circumferential direction, and is a plate having upper and lower flat surfaces.

As shown in FIGS. 2A and 3A, two insertion portions 11 are formed inward from the outer wall 12 of the rotating body 10 so as to be inclined in the rotation direction (counterclockwise). The insertion portion 11 is formed with a lead-out hole 16 through which the main cutter 22 is projected outward, and the main cutter 22 is inserted to the outside of the rotary body 10 so that the insertion portion 11 guides.

2A and 3B show a specific form of the insertion portion 11. The insertion portion 11 has a lead-out hole 16 formed inside from the outer diameter, a curved surface 11 a having a large radius in the rear in the rotation direction (X) and a curved surface 11 b having a small radius in the front in the rotation direction (X) from the lead-out hole 16. Are formed and have a box-like structure continuous from the outer wall 12. By this curved surface 11a, it is possible to guide the rotated main cutter 22 so as to bend along the curved surface for the purpose of preventing the main cutter 22 from protruding outward and extremely bending during the cutting operation. The lead-out hole 16 is formed at a position slightly inward from the outer diameter, and the curved surfaces 11a and 11b provide the insertion portion 11 with a radius for releasing the cutting work pressure in accordance with the rotation of the rotating body 10.

The inner wall 33 of the central portion 3 of the rotating body 10 has an insertion hole 34a and a projecting hole 34b which are aligned in the horizontal direction. The inner wall 33 of the central portion 3 has an inner wall surface that is slightly inclined in the height direction but rises almost similarly to the outer wall 12, so that the insertion hole 34a and the protruding hole 34b are formed on the surface facing the outer wall. Become. Of the insertion hole 34a and the projecting hole 34b, the insertion hole 34a is located at a position corresponding to the lead-out hole 16 of the outer wall 12, but may not necessarily be in the immediate vicinity of the lead-out hole 16, and the linear cutter 2 can be set surely. The position where it can be formed is preferable. In the present embodiment, as shown in FIG. 3B, a curved surface 11a is formed in the insertion portion 11, and the linear cutter 2 projects along the radius of the curved surface 11a. It is preferable that the insertion hole 34a is arranged in accordance with the protruding direction.

Although the above-mentioned guard 4 is formed with a plurality of protruding pieces 41, 41, it is preferable that the protruding piece 41 is not arranged in the portion where the insertion hole 34a and the protruding hole 34b are formed. As shown in FIG. 2A, in the present embodiment, the projecting piece 41 is projected in six directions of upper side, upper right side, upper left side, lower side, lower right side, and lower left side when viewed from the central portion 3 in the drawing. Although formed, the set of the insertion hole 34a and the projecting hole 34b is formed at two locations (two directions) on the right side and the left side as viewed from the central portion 3, and the projecting piece 41 is not formed in that direction. This not only secures the position of the insertion portion 11 and makes it easy for the user to pass the auxiliary cutter 23 through the insertion hole 34a and the projection hole 34b, but also because there is no projection piece 41 in that portion, grass cutting and the like can be performed. The auxiliary cutter 23 can cut a portion that is about to enter the storage space 15.

In the head 1 in this embodiment, the main cutter 22 and the auxiliary cutter 23 are arranged by one linear cutter 2. That is, one end of the linear cutter 2 is used as the main cutter 22, and the other end is used as the auxiliary cutter 23. Accordingly, it is possible to provide the head 1 using the two cutters with a simple configuration. Further, in the present embodiment, two linear cutters 2 each including the main cutter 22 and the auxiliary cutter 23 are used, and the two main cutters 22 and the auxiliary cutters 23 are used. This may be three or some other number.

One end of the linear cutter 2 projects outward from the lead-out hole 16 and projects outward from the outer diameter of the outer wall 12. The part protruding from the rotating body 10 serves as the main cutter 22. The main cutter 22 moves in the circumferential direction as the rotating body 10 rotates, and cuts grass such as weeds.

The other end of the linear cutter 2 is projected through the insertion hole 34a toward the central side of the central portion 3 and again through the projecting hole 34b so as to be located partially outside the rotary body 10. That is, the end of the linear cutter 2 on the side opposite to the main cutter 22 is passed through the insertion hole 34a from the outside so as to engage with the central portion 3, and is projected from the inside of the rotating body to the outside through the protruding hole 34b. To do. The projecting linear cutter 2 serves as the auxiliary cutter 23, and the projecting hole 34b serves as the base end portion of the auxiliary cutter 23.

As described above, the main cutter 22 and the auxiliary cutter 23 can be collectively attached and exchanged by simply attaching the linear cutter 2 to the insertion hole 34a and the projection hole 34b of the central portion 3. Further, according to the method of attaching the linear cutter 2, a locking tool for preventing the main cutter 22 from coming off has been separately required in the related art, but there is an effect that it is not necessary to use this.

Due to the presence of the auxiliary cutter 23, it is possible to cut grass that has entered the upper portion of the rotating body 10 and the connection portion with the drive connection portion 91. The auxiliary cutter 23 has a length that reaches the outside of the outer wall 12. In this case, the tip of the auxiliary cutter 23 is located outside the outer wall 12. Although the linear cutter 2 is made of a relatively hard resin, it is also flexible, so that when the bending due to rotation is taken into consideration, the linear cutter 2 should have a length such that its tip is located at least outside the outer wall 12. It is preferable to have. By doing so, the auxiliary cutter 23 can cut the grass cut around the rotating body 10.

Further, as shown in FIG. 3A, the upper edge of the outer wall 12 that rises is located above the protruding hole 34 b (base end portion) of the auxiliary cutter 23. As a result, when the tip of the auxiliary cutter 23 is located outside the outer wall 12, the tip end of the auxiliary cutter 23 faces upward when it exceeds the upper edge of the outer wall 12. As a result, the auxiliary cutter 23 can easily cut the grass that is entangled above the rotating body 10.

In addition, at the portion of the auxiliary cutter 23 protruding into the accommodation space 15, for example, cutting grass or the like that is trying to enter the accommodation space 15 can be cut to prevent these from being entangled in the insertion hole 34a or the like. At the portion of the auxiliary cutter 23 protruding above and outside the rotating body 10, for example, cutting grass is cut at the outer periphery of the storage space 15 to prevent these from entering the periphery of the storage space 15, and the drive connecting portion. It is possible to prevent the grass from being entangled with the 91.

The linear cutter 2 has, for example, a plurality of shark tooth-shaped blades 21 as shown in FIG. 4A, and a plurality of spiral blades 21 as shown in FIG. 4B. However, the shape is not limited to these.

1... Head, 2... Linear cutter, 3... Central part, 4... Guard, 10... Rotating body, 11... Insertion part, 12... Outer wall, 15... Storage space, 16... Derivation hole, 22... Main cutter, 23... Auxiliary cutter, 34a... Insertion hole, 34b... Projection hole (base end portion), 41... Projection piece, 91... Drive connection part

Claims (3)

A head for a mower, which is composed of a rotating body that is detachably attached to the tip of the drive connecting portion and that is rotated by the drive connecting portion, and a linear cutter made of synthetic resin, and the linear cutter projects outside the rotating body. And
The rotating body has a box-like shape that is continuous from the outer wall, and has a lead-out hole that is open to the outer wall and an insertion portion formed with a curved surface that has a small radius in the rotation direction front and a large radius in the rotation direction rear from the extraction hole. And an insertion hole and a projecting hole opened in a horizontal direction on the inner wall of the central portion,
The linear cutter has a main cutter protruding from the outer wall and an auxiliary cutter protruding from the inner wall ,
Wherein a the main cutter and the auxiliary cutter, Ri Do from one linear cutter,
One end of the one linear cutter is the main cutter that is guided to the insertion portion from the outlet hole and projects outward,
The other end is inserted into the inside of the central portion from the insertion hole, and the auxiliary cutter is further projected from the protruding hole to the outside of the central portion,
A linear cutter type head for a mower, wherein an upper edge of the outer wall is located above the projecting hole, and the tip of the auxiliary cutter is projected above the rotating body by the upper edge . The linear cutter type head for a mower according to claim 1, wherein the auxiliary cutter has a length that projects outward from at least a central portion. It has a plate-shaped guard in the center,
The linear cutter type head for a mower according to claim 1 or 2 , wherein the guard has a protruding piece that is radially formed so as to protrude in a portion other than a portion where the insertion portion is arranged .

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