A brush cutter equipped with a fixed blade to prevent vines from getting tangled in it.

Abstract

To prevent vines from getting tangled and causing problems when using the brush cutter, a cutting and fixing blade is provided on the generatrix of the winding shaft, and the mounting cylindrical part is tilted in the direction in which the grass cutting blade rotates away, and the cutting and fixing blade is provided on the generatrix of the winding shaft, thereby providing a brush cutter with a vine winding cutting blade. [Solution] The present invention features a brush cutter with a cutting and fixing blade, wherein a cutting and fixing blade (1) is provided on the generatrix of the cylindrical part of the brush cutter around which vines wrap, and if necessary, a vine cutting and fixing blade mounting attachment (3) is used to tilt the vine cutting and fixing blade (2) in the direction in which the rotation of the grass cutting blade is released and mount it on the generatrix of the mounting part.

Description

Technical Field

[0001] This invention relates to a weed cutter equipped with a blade for cutting the weeds that wrap around a lawn mower.

Background Art

[0002] Conventionally, to prevent vines and the like from wrapping around a weed cutter, an auxiliary blade for cutting vines and the like is attached to the cutting blade, or the shape of the cutting blade is devised, and the blade is rotated to cut the vines so that they do not wrap around.

[0003] Efforts have been made to make the shape of the rotating blade such that it can more easily cut vines and prevent them from wrapping around.

[0004] Although inventions have been made for fixed blades for preventing vines and the like from wrapping around a weed cutter, the structure is not easily effective, and no device has been devised that is complex and can easily cut and eliminate vines and the like, so it is not practical.

[0005] For example, as devices for preventing vine wrapping by devising the shape of an auxiliary blade for cutting vines attached in addition to the cutting blade, there are JP-A-2005-118003 and Utility Model Registration No. 3190973. Also, as devices for preventing vine wrapping by devising the shape of the cutting blade to cut vines, there are JP-A-2024-146493 and Utility Model Registration No. 3230448. As devices that provide an auxiliary fixed blade, there are JP-A-2009-44980 and Utility Model Registration No. 3190973. And although not generally put into practical use, as ideas for vine cutting fixed blades, there are JP-A-2013-081444 and JP-A-2007-060958.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

[0007] However, with the conventional method of preventing vine entanglement using a rotating blade described above, if vines that cannot be cut are pulled in the same direction as the rotating blade and rotate, the blade can no longer cut them, causing them to entangle and putting a load on the rotating part, making it difficult to rotate and thus hindering the use of the brush cutter. This is particularly noticeable when using a safe nylon cord blade for brush cutting, and steel rotating blades are extremely dangerous. Furthermore, the devised method of cutting vines using a fixed blade is structurally complex and not very effective. When the blade is installed on the winding shaft or away from the winding shaft, there is no ingenuity to easily cut and remove the entangled vines, such as tilting the fixed blade from the generatrix of the cylindrical mounting part in the direction in which the rotation of the rotating blade is released. Therefore, it cannot be considered a simple and effective method for preventing vine entanglement in brush cutters. Thus, it has been difficult to prevent vines from entangled in brush cutters using conventional methods. Current methods for preventing vine entanglement only reduce the amount of entanglement, making mowing areas with many vines extremely troublesome, as the entangled vines must be removed by hand with a sickle or other tool. This is particularly problematic when using a nylon cord blade to pulverize and remove the grass, or when mowing safely to avoid injuring people or property.

[0008] Furthermore, the design of the fixed blade attached to the brush cutter to cut vines that wrap around it is complex in structure and not well thought out to be effective, making it difficult to call it practical.

[0009] This invention solves these problems by providing a simple and effective way to install a fixed vine-cutting blade on a brush cutter, structurally cutting vines naturally and preventing them from wrapping around the cutter, thereby preventing vine entanglement from interfering with brush cutting. [Means for solving the problem]

[0010] To achieve the above objective, a fixed cutting blade [(1) or (2) or both] is installed near the fixing part of the main pipe tip (gear case / howling) of the brush cutter, either on the shaft with a vine winding mechanism or just before it. A vine cutting fixed blade mounting attachment (3) is also used as needed. When the fixed cutting blade is installed at a position away from the shaft with a vine winding mechanism (2), excessive force is applied in the direction of rotation, so it should be installed at an angle from the generatrix of the cylindrical part of the mounting section in the direction in which the rotation of the rotating blade is released, in order to relieve this force. Furthermore, since a gap is created between the rotating part and the fixed part, it is preferable to use a hook blade (2) that is recessed inward to prevent vines from entering the gap. In addition, for safety, it is preferable to apply tape or a breakage prevention material to the side (flat) of the cutting blade to prevent it from flying off if it breaks due to excessive force.

[0011] The vine cutting fixed blade mounting attachment (3) has a groove that is slightly larger than the diameter of the cylindrical mounting part and is a curved surface as shown in Figure 3(12), and the opposing surfaces as shown in Figure 3(13) are arranged in the opposite direction so that the groove beyond the diameter of the mounting part is slightly shorter. [Effects of the Invention]

[0012] When using a brush cutter based on the present invention, vines that naturally try to wrap around the brush cutter are cut and removed by this action in a simpler and more effective manner than conventional designs, allowing for brush cutting without the vines wrapping around the brush cutter. In other words, there is no obstruction to brush cutting by vines wrapping around the brush cutter, and vines do not wrap around the brush cutter. Furthermore, being able to use a safe nylon blade and perform brush cutting without being hindered by vines wrapping around the brush cutter has a significant effect not only on efficiency but also on safety in brush cutting.

[0013] By installing a cutting blade on the gear case of the brush cutter [Figures 1 and 2(1)], the vines are cut and removed by the force with which they wrap around and tighten. By directly installing the cutting blade at the exact location where the vines wrap around and make contact (at the smallest diameter shaft of the gear case), it is possible to easily and effectively cut and remove the vines that wrap around the brush cutter.

[0014] By positioning the fixed cutting blade diagonally from the generatrix of the cylindrical mounting section in the direction from which the rotation of the rotating blade is released [Figures 1 and 2(2)], the force pulling in the direction of rotation can be released, making it easier to cut vines and reducing the risk of the cutting blade breaking or the wear of the blade edge.

[0015] A gap must be left between the rotating part of the brush cutter and the cutting blade. With a straight blade, uncut material can slip through the gap and get tangled, whereas with an inwardly recessed hook blade [Figure 1(2)], uncut material is guided towards the blade, preventing it from sliding into the gap and instead being cut by the blade, thus preventing it from getting tangled.

[0016] The vine-cutting fixed blade mounting attachment (3) [Figures 1 and 2(3), Figures 3-5] has the effect of mounting the vine-cutting fixed blade to the brush cutter at an angle that allows the rotation of the rotating blade to escape from the main axis of the cylindrical mounting part, making it easier to cut vines.

[0017] Furthermore, the vine cutting fixing blade mounting attachment (3) is designed to have a groove that is slightly larger than the diameter of the cylindrical mounting part and is a curved surface as shown in Figure 3(12). The mating surface shown in Figure 3(13) is designed so that the groove beyond the diameter of the mounting part is slightly shorter in the opposite direction. By sandwiching the vine cutting fixing blade between the mating surfaces shown in Figure 3(11), passing a bolt through the hole and tightening it with a nut, and sandwiching the mounting part inside Figure 3(12), passing a bolt through the holes shown in Figure 3(9) and(10) and tightening it with a nut, the attachment is secured to the mounting part, and at the same time, the mounting side of the vine cutting fixing blade clamping part shown in Figure 3(11) is firmly tightened, effectively securing the vine cutting fixing blade. [Brief explanation of the drawing]

[0018] [Figure 1] It is a side view of the tip of the main pipe showing an embodiment of a grass cutter according to the present invention. [Figure 2] It is a front view of the tip of the main pipe showing an embodiment of a grass cutter according to the present invention. [Figure 3] It is an open perspective view of a vine cutting fixed blade attachment (3) according to the present invention. [Figure 4] It is an open side view of a vine cutting fixed blade attachment (3) according to the present invention. [Figure 5] It is an open top view of a vine cutting fixed blade attachment (3) according to the present invention. [Figure 6] It is a top view showing only the vine cutting fixed blade attachment and the cylindrical portion with the vine cutting fixed blade attachment (3) of the present invention attached to the cylindrical portion of the attachment part, omitting the vine cutting fixed blade and the fastening member.

Mode for Carrying Out the Invention

[0019] Embodiments of the present invention will be described with reference to the drawings. The gist of the present invention is characterized by providing a fixed blade for cutting the creeping weeds that wind around as shown in FIGS. 1 and 2 in grass cutting by a grass cutter.

[0020] As a method of providing the vine cutting fixed blades (1) and (2) to the grass cutter, they are attached using a vine cutting fixed blade attachment (3), attached by welding, a grass cutter provided with an attachment site is created and attached by screwing or the like, a grass cutter provided with the vine cutting fixed blades is created, the position where the creeping weeds wind around is processed sharply, and there are other methods.

[0021] For the vine cutting fixed blade attachment (3), the vine cutting fixed blade is sandwiched on the surface (11) of FIG. 3, a screw bolt is passed through the hole (8) and tightened and fixed with a nut, the surface (12) is sandwiched at the attachment position of the grass cutter, a screw bolt is passed through the holes (9) and (10) and tightened with a nut to fix and attach it to the grass cutter.

[0022] In the installation, if the vine-cutting fixing blade is located away from the rotation axis of the rotary cutting blade (6), it is preferable to mount it diagonally from the generatrix of the cylindrical mounting part, as shown in Figure 2, in order to release the lateral force caused by the vine wrapping around it. The blade used is preferably a hook blade (2) that is recessed inward.

[0023] For the vine-cutting fixing blade that is clamped into the (11) surface in Figure 3, it is preferable to use one with a hole at the position of hole (8), or to make a hole in it.

[0024] Depending on the situation, the vine-cutting fixed blade may be fitted with either a straight blade (1) or a hook blade (2), or both.

[0025] It is preferable to apply breakage prevention tape or a breakage prevention material to both or one side of the bevel of the fixed cutting blades (1) and (2) used for cutting vines, etc. [Explanation of Symbols]

[0026] 1 straight blade 2. Inwardly recessed hook blade 3. Vine cutting fixed blade mounting attachment 4 Gear Case 5 Push metal fittings 6 Rotary cutting blades 7 Main pipe 8. Through-holes for screw bolts to secure the vine cutting blade. 9,10 Screw bolt holes for attaching and tightening the brush cutter. 11 Vine cutting fixed blade clamping section 12. Grip section of brush cutter (gear case, etc.) 13 The cylindrical mounting portion and the hook blade (2) and other vine-cutting fixing blades are simultaneously compressed and fixed when brought close together.

Claims

1. A brush cutter equipped with a cutting blade on a shaft around which vines and grasses wrap.

2. A brush cutter according to claim 1, with the cylindrical portion of the winding shaft on the generatrix.

3. A brush cutter having a cutting blade mounted vertically on the shaft according to claim 1.

4. A brush cutter having a cutting blade positioned diagonally on the shaft according to claim 1.

5. A brush cutter in which the rotating cutting blade is tilted in the direction in which it is released, and the cutting blade is mounted from the generatrix of the cylindrical part of the mounting section.

6. A gear case for a brush cutter with a cutting blade attached.

7. A brush cutter in which the cutting blade is mounted at an angle so that the rotation of the rotating cutting blade is released from the main shaft of the cylindrical part of the mounting section to the gear case or main pipe.

8. A mechanism that guides entangled vines toward the blade by attaching a vine-cutting fixed blade mounting attachment (3) to the gear case (4) or main pipe (7) of the brush cutter, thereby guiding the entangled vines toward the blade.

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