JP2005160443A - Mowing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mowing machine that causes no abrasion of a grounding protector even during bush-cutting operations and in no need of fuel consumption in an extra amount. <P>SOLUTION: In the mowing machine that is equipped with rotary disks 31, 32 that are rotary-driven by a driving shaft 4 connected to a motor, a plurality of blades 34 attached to the outer peripheral areas of the disk plates 31, 32, and the grounding protector 1 that is connected to the edged of the driving shaft 4 at a lower part of the rotary disk 32 and coming into contact with the ground face to protect the cutting blades 34, the central boss part 10a of the grounding protector 1 is connected via a bearing mechanism 11 to the driving shaft 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a mower / brusher that has an engine or the like and cuts weeds and the like while moving by manual operation, and in particular, improves the function of a ground protector for protecting the cutting blade or cutter from directly contacting the ground. It is a thing.

As shown in FIG. 5, the mower has a basic configuration of a prime mover 20 such as a gasoline engine, a shaft portion 21 extending from the prime mover 20, and a cutting means 3 provided at the tip of the shaft portion 21. A transmission shaft 23 connected to the prime mover 20 is provided in the shaft portion 21, and the transmission shaft 23 is rotated by driving the prime mover 20, whereby the cutting means 3 connected to the transmission shaft 23 is driven to turn. It is like that. And by operating the cutting means 3 with the handle 22 provided on the shaft portion, weeds and the like are cut and trimmed.

Conventionally, a metal disk blade or the like is used as the cutting means 3, and a cutting means 3 that is extremely excellent in safety, sharpness, and durability is also provided (see Patent Document 1). By the way, a ground casing for protecting the lower surface of the cutting means 3 by contact with the ground is provided (see Patent Document 2). However, since the ground casing is integrally connected to the cutting means 3, the ground casing rotates while in contact with the ground when the mowing operation is performed, so it has to be damaged and replaced. . In particular, when mowing in a place with a lot of pebbles and gravel, the ground casing was very worn and damaged, so it was necessary to replace it early. In addition, the rotation speed of the cutting means 3 decreases due to the resistance caused by the contact of the ground casing with the ground, and it is necessary to increase the rotation speed to compensate for the decrease, which consumes excess fuel. Become. In order to prevent these, it is necessary to work in a state where the lower surface is lifted, and the worker requires a great deal of labor.
Utility Model Registration No. 3079507 JP 2002-236208 A

The present invention provides a mower that does not wear a grounding protector and does not require extra fuel even during a mowing operation.

A mower according to the present invention includes a rotating disk that is driven to rotate by a driving shaft connected to a prime mover, a plurality of cutting blades provided in an outer peripheral area of the rotating disk, and an end portion of the driving shaft below the rotating disk. And a ground protector that contacts the ground and protects the cutting blade, and when the central boss portion of the ground protector is connected to the rotating disk drive shaft via a bearing mechanism and comes into contact with the ground, The ground protector is configured to be stationary. Therefore, even if the mowing operation is performed with the ground protector placed on the ground, the ground protector is not damaged and does not need to be replaced.

Preferably, a plurality of vertical shafts are implanted in the outer peripheral area of the rotating disk with respect to the surface of the rotating disk, and a cutting blade is supported on these axes so as to be able to rotate through a gap. To do. Thus, by supporting the cutting blade so as to be able to rotate, it is possible to prevent rebound (kickback) due to a reaction when the cutting blade comes into contact with a fixed object, and it is possible to prevent an accident of an operator or the like.

More preferably, since the bearing mechanism is a ball bearing, the ground protector can be held rotatably with respect to the drive shaft, so that it can be manufactured very easily, and the productivity / It is excellent in economic efficiency.

According to the mower according to the present invention, since the grounding protector provided on the lower surface can perform the mowing work without rotating, the lower surface is not damaged or worn, and it is necessary to replace the protector. Disappear. Therefore, it is particularly effective when mowing in places where there is a lot of pebbles, gravel, etc., where the protector on the lower surface is severely worn or worn, and there is no need to replace the lower protector that had to be replaced early. It is extremely excellent in economic efficiency and convenience. Further, since the ground protector does not rotate even when it comes into contact with the ground, there is no rotation resistance of the cutting means due to contact, and no extra fuel required for contact resistance is consumed. Therefore, since unnecessary fuel is unnecessary, it is economically efficient, can reduce fuel exchange, reduce complicated work, suppress excessive exhaust gas discharge, and greatly reduce environmental problems. Can make a great contribution. And since the grounding protector on the lower surface does not rotate, the mowing work can be performed with the grounding protector placed on the ground, and the labor of the worker is remarkably reduced and the light work can be performed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A is a cross-sectional view showing a peripheral mechanism of a grounding protector provided in the mower according to the present invention, and FIG. 1B is an enlarged cross-sectional view of the periphery of the bearing mechanism. FIG. 2 is an exploded perspective view showing FIG. 1 from above. As shown in the drawings, a transmission shaft 23 is provided in a shaft portion 21 extending from a prime mover (not shown). The transmission shaft 23 is connected to the prime mover and rotates at high speed by driving the prime mover. The transmission shaft 23 extends to the gear chamber 24 provided at the tip of the shaft portion 21. The bevel gears 41 and 23 a (dotted line portions) housed in the gear chamber 24 change the angle to the drive shaft 4. It is connected. Then, the bolt 40 provided at the end of the drive shaft 4 is inserted into the cutting means 3 and the ground protector 1, and the nut 6 is screwed onto the tip of the bolt 40, whereby the drive shaft 4 is connected to the cutting means 3 and the ground. Connect to the protector 1.

The ground protector 1 includes a circular protector body 10 that is open at the top and swells at the bottom. Further, the protector main body 10 has a boss portion 10a projecting from the center, and a bearing mechanism 11 is fitted to the boss portion 10a. The bearing mechanism 11 is a ball bearing. As shown in FIG. 1B, a plurality of balls 11c are sandwiched between the bearing portion 11a and the rotating portion 11b, and the rolling of each ball 11c causes the bearing portion 11a and the rotating portion 11b. Are relatively rotatable. Then, the bearing 11 is fitted to the ground protector 1 by being fixed to the boss portion 10 a of the protector body 10 to the bearing portion 11 a of the bearing 11.

A spacer 5 having a mounting hole 50 penetrating through the center is provided between the cutting means 3 and the ground protector 1. The cutting means 3 is also provided with a mounting hole 30 in the center, and the bolt portion 40 of the drive shaft 4 is inserted through the mounting means 50 of the cutting means 3 and the spacer 5 and further through the bearing 11. As shown in FIG. 1B, the spacer 5 is placed on the rotating portion 11 b of the bearing 11, and the nut 5 is firmly tightened to the tip of the bolt portion 40, whereby the spacer 5 and the nut 6 rotate the bearing 11. It is comprised so that the part 11b may be pinched | interposed strongly. As a result, the drive shaft 4 integrates the bearing 11 and the cutting means 3, and the ground protector 1 is held rotatably with respect to the drive shaft 4. Accordingly, the cutting means 3 is rotated by the rotation of the drive shaft 4, but the ground protector 1 is held by the drive shaft 4 via the bearing 11 and is not rotated and is stopped.

FIG. 3 is a plan view with a part broken away showing the cutting means. As shown in FIGS. 1 and 3, the cutting means 3 includes a circular upper rotating disk 31 and a lower rotating disk 32, and each rotating disk 31, 32 has three vertical shafts 33, 33 ′, 33 ″. Are connected by A mounting hole 30 is provided at the center of the cutting means 3, and the bolt portion 40 of the drive shaft 4 is inserted into the mounting hole 30 as described above. The cutting means 3 is provided with circular cutting blades 34, 34 ', 34 "for each vertical shaft 33, 33', 33". The cutting blade 34 is provided with a holding hole 34 a having a diameter larger than that of the vertical shaft 33 in the center, and the vertical shaft 33 is inserted into the holding hole 34 a to form a space formed between the rotary plates 31 and 32. Since it is arranged, it is supported so as to be rotatable with respect to the respective turntables 31 and 32 through a gap. Further, the cutting blade 34 is provided with a plurality of metal cutting edges 34 b radially around the periphery, and the metal cutting edges 34 b are provided so as to protrude from the respective rotary disks 31 and 32. With the configuration described above, the rotation of the drive shaft 4 causes the cutting blade 34 to revolve with respect to the shaft 4 as the rotary disks 31 and 32 are driven to rotate, whereby the cutting edge 34b cuts weeds and the like. can do. Since the cutting blade 34 is disposed so as to be rotatable with respect to the turntables 31 and 32, when the cutting edge 34b comes into contact with a fixed object, the cutting blade 34 rotates, so that the impact is absorbed and relaxed. There is no splashing of pebbles.

The embodiment of the cutting means 3 provided with a circular cutting blade has been described above. This cutting means 3 ′ is provided with a plurality of cutting blades on the outer periphery of a metal rotating disk as shown in FIG. Further, it may be a single metal rotary blade, and can be applied to various cutting means driven to rotate. Although the grounding protector 1 of the above-described embodiment covers the cutting means 3 so that the cutting blade 34 protrudes slightly, the hook-shaped grounding protector 1 is smaller than the cutting means 3 as shown in FIG. In short, it is only necessary to transmit the rotation of the drive shaft 4 only to the cutting means 3 when the ground protector 1 is grounded to the ground, thereby preventing the ground protector 1 from being worn or damaged. In addition, it is sufficient if extra labor can be eliminated. The protector body 10 is preferably made of a comparatively lightweight synthetic resin. In this embodiment, the protector body 10 is made of an impact resistant resin. However, the protector body 10 may be made of a metal as long as it is lightweight and strong. Further, the drive shaft 4 connected to the cutting means 3 may be directly connected to the prime mover, and in this case, the cutting means 3 is configured to be pivotally driven perpendicular to the shaft portion 21.

1A is a cross-sectional view showing a peripheral mechanism of a grounding protector provided in the mower according to the present invention, and FIG. 1B is an enlarged cross-sectional view of the bearing mechanism. FIG. 2 is an exploded perspective view showing FIG. 1 from above. It is the top view which fractured | ruptured a part which shows a cutting means. It is sectional drawing for demonstrating another Example. It is a perspective view which shows the whole mowing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grounding protector 10 Protector main body 11 Bearing mechanism 3 Cutting means 31 Upper rotating disk 32 Lower rotating disk 34 Cutting blade 4 Drive shaft 5 Spacer 6 Nut

Claims (3)

A rotating disk that is pivotally driven by a driving shaft connected to a prime mover, a plurality of cutting blades provided in an outer peripheral area of the rotating disk, and connected to an end of the driving shaft below the rotating disk and ground A mowing machine comprising a ground protector that abuts against the ground and protects the cutting blade, wherein a central boss portion of the ground protector is connected to the rotating disk drive shaft through a bearing mechanism. A plurality of vertical shafts are implanted in the outer peripheral area of the rotating disk with respect to the surface of the rotating disk, and a cutting blade is supported on these shafts so as to be able to rotate through a gap. Item 1. A mower according to item 1. The mower according to claim 1 or 2, wherein the bearing mechanism is a ball bearing.

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