TW201718172A - Sharpener - Google Patents

Abstract

The present invention addresses the problem of providing a sharpener (1) that is even capable of handling changes in the external diameter of a rotary blade (5) and does not require a guide part for locating the center point of the rotary blade (5). A sharpener (1) for solving said problem is a sharpener (1) to be used on the rotary blade (5) of a brush cutter. The sharpener is characterized in being provided with: a first base plate (3a), at least one end of which is fixed; a second base plate (3b) forming a specified angle with respect to the first base plate (3a) and at least one end of which is fixed; and sharpening members (4) that are provided on the first base plate (3a) and the second base plate (3b) and are for coming in contact with and sharpening the circumference of the rotary blade (5).

Description

abrader

The present invention relates to a grinder for restoring or increasing the sharpness of a rotary knife of a lawn mower.

Previously, a mowing machine (mower) with a prime mover was used in the removal of weeds, and the prime mover used fossil fuel or electricity. Generally, the lawn mower is provided with a handle for the user to grip near the center of the main pipe, and the prime end of the main pipe is mounted with a prime mover, and a rotary knife is mounted at the front end thereof. If the sharpness of the rotary knife is not good, it needs to be removed and ground.

In view of the cumbersome removal and installation work of the rotary knives, the industry has invented a rotary cutter grinding device (for example, Patent Document 1) that uses a rotary motive derived from a lawn mower.

However, in the previous rotary cutter grinding device, since the outer diameter of the rotary cutter does not coincide with the curvature of the grinding surface, or it is necessary to provide a guide member that takes out the center point of the rotary cutter, the rotary cutter to be used is limited, and the number of parts is limited. There are also many reasons for the price.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2015-80825

Therefore, it is an object of the present invention to provide a grinder which not only has a change in the outer diameter of the rotary blade but also a guide member for picking up the center point of the rotary blade.

In order to achieve the above object, the present invention adopts the following means.

(Invention of Patent Application No. 1)

The invention of claim 1 is a grinder for a rotary cutter of a lawn mower, characterized in that: a first substrate having at least one end fixed; and a second substrate opposite to the first The substrate is formed at a specific angle, and at least one end thereof is fixed; and the polishing member is provided on the first substrate and the second substrate, and is abutted against the outer circumference of the rotating blade to be polished.

(Invention of claim 2)

According to a second aspect of the invention, the first substrate and the second substrate are formed of a material that can be deflected by the pressing of the rotary blade.

(Invention of claim 3)

According to the invention of claim 3, in the grinder of claim 2, the fixed portion of the first substrate and the second substrate is only the outer circumference of the rotary knife in the rotation direction of the rotary blade. side.

(Invention of claim 4)

The invention of any one of claims 1 to 3, wherein the angle between the first substrate and the second substrate is 60 to 120 degrees.

(Invention of claim 5)

The invention according to any one of claims 1 to 4, wherein the first substrate and the second substrate each having a rectangular shape have long holes in a length direction thereof The polishing member is slidably movable along a longitudinal direction of the first substrate and the second substrate via the long holes.

(Invention of claim 6)

The invention according to any one of claims 1 to 5, wherein the fixing member fixed to each of the first substrate and the second substrate has an L shape, and a fixing piece vertically disposed on the fixing member, wherein the fixing piece has a fixing hole penetrating the fixing piece; The first substrate and the second substrate have a fixing hole penetrating through the outer circumference of the rotary blade in the rotation direction of the rotary blade; and the bolt and the bolt are inserted through the fixing hole and the fixing hole In the nut, the first substrate and the second substrate are respectively fixed to the fixing member.

(Effect of the invention of claim 1)

According to the invention of the first application of the patent application, the arc of the outer circumference of the rotary cutter enters between the spaces to which the angle is given and becomes a specific angle, so that it is possible to provide a change in the outer diameter of the rotary cutter. The grinder for the guide part of the center point of the rotary knife needs to be taken out.

(Effect of the invention of claim 2)

In the case of the grinder of claim 2, the deflection angle is generated by the elastic deformation of the first substrate and the second substrate. Thereby, a clearance angle is generated in the contact between the polishing portion of the polishing member and the sheet portion. By the change in the angle of the clearance angle, the grinding corresponding to the adjustment of the force of the pressing can be performed. Thereby, the user can perform the grinding operation without nervousness against the injury of the rotary knife.

(Effect of the invention of claim 3)

According to the invention of claim 3, the contact position between the first substrate and the second substrate and the outer circumference of the rotary blade becomes the side opposite to the outer circumference of the rotary blade (the rotary knife that is rotated counterclockwise from the user's observation) In the case, the position of the abutting position is the side of the clockwise direction, and the first substrate and The elastic deformation of the second substrate is multiplied to perform a more suitable grinding operation.

(Effect of the invention of claim 4)

Preferably, the first substrate and the second substrate are disposed at an angle of 60 to 120 degrees.

(Effect of the invention of claim 5)

If it is set as the invention of claim 5, even if the polishing portion of the polishing member is partially worn, the portion which is not worn can be used by sliding the position of the polishing member to correspond to the length of the long hole. Thereby, the use period of the abrasive member can be increased.

(Effect of the invention of claim 6)

In the case of the invention of the sixth application of the patent application, the L-shaped plate and the two substrates (the first substrate and the second substrate) can be formed into a grinder having a very small number of main parts.

1‧‧‧Mr.

10‧‧‧ bolt

11‧‧‧ Nuts

12‧‧‧ nails

2‧‧‧Fixed components

20‧‧‧Fixed tablets

21‧‧‧Fixed holes

22‧‧‧Base fixing hole

3a‧‧‧First substrate

3b‧‧‧second substrate

30‧‧‧ long holes

31‧‧‧Fixed holes

32‧‧‧flex angle

4‧‧‧Abrased components

40‧‧‧ Grinding Department

41‧‧‧ long hole

42‧‧‧ bolt

43‧‧‧ Nuts

5‧‧‧Rotary knife

50‧‧ ‧ Parts

51‧‧‧ clearance angle

Figure 1 is an overall perspective view of the grinder.

Figure 2 is an exploded perspective view of the grinder.

Fig. 3 is an overall perspective view of the fixing member, the first substrate, and the second substrate.

Fig. 4 is an overall perspective view of the fixing member, the first substrate, and the second substrate.

Fig. 5 is a plan view showing the entire structure of the fixing member, the first substrate, and the second substrate.

Figure 6 is a plan view showing the beginning of the grinding operation.

Figure 7 is a plan view showing the grinding operation.

Figure 8 is a partially enlarged plan view showing the grinding operation.

Hereinafter, the grinder 1 of the present invention will be described with reference to the drawings as an embodiment.

[Example 1] [1. About the grinder 1]

Fig. 1 is an overall perspective view of the grinder 1. Fig. 2 is an exploded perspective view of the grinder 1.

As shown in FIG. 1, the grinder 1 includes a fixing member 2, a first substrate 3a, a second substrate 3b, and a polishing member 4. As shown in Fig. 2, the end portions of the fixing member 2 and the first substrate 3a and the second substrate 3b are fixed by screwing of the bolt 10 and the nut 11, and the whole of the grinder 1 is attached to the base by the nail 12 ( Floor or floor).

By fixing the specific angle of the first substrate 3a and the second substrate 3b at 60° to 120° (preferably 80° to 100°), the polishing members 4 will each rotate with the lawn mower 5 contact. In each drawing, it is adopted The best specific angle is 90°.

[2. About fixed components 2]

3 is an overall perspective view of the fixing member 2 and the first substrate 3a and the second substrate 3b, and FIG. 4 is an overall perspective view of the fixing member 2 and the first substrate 3a and the second substrate 3b, and FIG. 5 is a fixing member 2 and An overall plan view of the first substrate 3a and the second substrate 3b.

As shown in FIGS. 1 to 5, the fixing member 2 is provided at a base (floor or floor surface) which is an L-shaped metal member. The L-shaped shape of the fixing member 2 can be divided into an inner long side and an inner short side, an outer long side and an outer short side.

As shown in FIGS. 3 to 5, the fixing piece 20 is vertically provided on the inner side of the inner side short side, and the fixing piece 20 is formed on the other side of the inner side long side which is not the inner side short side. In other words, regarding both the inner short side and the inner long side, the fixing piece 20 is formed at the end portion on the clockwise running direction side as viewed from above. Thereby, the fixing piece 20 is set so as to be viewed from above, and the outer circumference of the rotary blade 5 in the rotational direction of the rotary blade 5 in the counterclockwise direction comes.

Further, the fixing pieces 20 respectively extend vertically upward with respect to the plane of the fixing member 2, and are provided with fixing holes 21 penetrating the fixing pieces 20. The shaft of the bolt 10 is inserted into the fixing hole 21, respectively.

As shown in FIGS. 3 to 5, the vicinity of the intersection of the short side and the outer long side of the outer side of the L-shaped shape of the fixing member 2, the side of the outer side of the short side of the outer side, and the short side of the outer side. Non-external lateral side Near the one end, base fixing holes 22 are respectively provided. A shaft of the nail 12 is inserted into the base fixing hole 22.

As the fixing member 2, a metal plate such as stainless steel can be exemplified, and the fixing piece 20 can be provided by bending.

[3. Regarding the first substrate 3a and the second substrate 3b]

As shown in FIGS. 1 to 4, the first substrate 3a and the second substrate 3b are provided with elongated holes 30 and fixed holes 31, respectively.

The long holes 30 are provided in the vicinity of the upper end portion and the lower end portion of the substantially central portion of the rectangular first substrate 3a and the second substrate 3b along the longitudinal direction of each of the first substrate 3a and the second substrate 3b. In this manner, the mounting position of the polishing member 4 can be slidable with respect to the longitudinal direction of the first substrate 3a and the second substrate 3b.

The fixed hole 31 is provided only in the end side of the outer circumference of the rotary blade 5 in the rotation direction of the rotary blade 5 (the upper side is viewed from the upper side, and the side in the clockwise direction) is provided in each of the first substrate 3a and the second substrate 3b. nearby. Generally, the rotary blade 5 of the lawn mower rotates counterclockwise as viewed from above. Thus, the fixed positions of the first substrate 3a and the second substrate 3b are respectively in the longitudinal direction of the first substrate 3a and the second substrate 3b. The contact position between the polishing member 4 and the rotary blade 5 is the arrival side of the rotary blade 5.

Here, the distance in the vicinity of the end portion is within a range of 3% to 9% of the length of the first substrate 3a and the second substrate 3b. In the first to seventh figures, the fixing hole 31 is provided at a position 6% of the longitudinal distance from the arrival side end of the rotary blade 5 toward the running direction of the rotary blade 5. If the fixing holes 31 are long holes that are provided to extend in the longitudinal direction of each of the first substrate 3a and the second substrate 3b, the polishing member 4 can be slid, which is satisfactory.

[4. Regarding the grinding member 4]

As shown in FIGS. 1 and 2, the polishing member 4 is attached to substantially the center of each of the first substrate 3a and the second substrate 3b, and is substantially at the center in the short-side direction of each of the first substrate 3a and the second substrate 3b. The polishing unit 40 is provided, and a long hole 41 is provided in the vicinity of both ends. Here, the distance in the vicinity of both ends is in the range of 7% to 13% of the distance between the first substrate 3a and the second substrate 3b in the short-side direction. In Figs. 1 and 2, the distance from the end portion of 10% is set to the center of the long hole 41.

The polishing unit 40 is a member for grinding the outer circumference of the rotary blade 5 such as a grindstone or a ceramic.

The long hole 41 further increases the amount of sliding of the polishing member 4 derived from the long hole 30. Thus, even if the polishing portion 40 is partially worn, the position of the polishing member 4 can be slid according to the combined length of the elongated hole 30 and the elongated hole 41, and the unworn portion of the polishing portion 40 is positioned, and the bolt 42 and the nut 43 are used. Screwed and fixed. Thereby, the use period of the polishing member 4 can be increased (during the replacement period). Moreover, in the case where the polishing member 4 and the first substrate 3a and the second substrate 3b are joined and integrated without using the screw 42 and the nut 43, the fixed hole 31 is formed as a long hole. The aforementioned sliding and positioning can be performed.

[5. Grinding operation using lawn mower and grinder 1]

Fig. 6 is a plan view showing the start of the polishing operation, Fig. 7 is a plan view showing the polishing operation, and Fig. 8 is a partially enlarged plan view showing the polishing operation.

Lawn mowers (general mowers, not limited to terrain mowers) are machines used to cut grass or small diameter trees. The structure of the lawn mower is composed of a prime mover (motor, engine), a main pipe (shaft, rod), and a rotary knife (slice saw), and the operator operates the handle fixed to the main pipe to cut grass. In general, the right hand portion is provided with an engine throttle valve, and the number of revolutions of the engine (the number of revolutions of the rotary knife) is adjusted by adjusting it. In the engine type, a centrifugal clutch is provided between the drive shaft and the drive shaft to prevent unwanted rotation of the tooth portion such as the start/idle speed, and to prevent the tooth portion from being stopped by biting into the grass.

As shown in Fig. 6, the user operates the user to turn on the engine in the state shown in Fig. 7 after the user rotates the unrotating rotary blade 5 against the grinder 1 described below in an idling state. The throttle valve grinds the rotary cutter 5 using the rotational force of the lawn mower.

Further, in the present invention, as shown in Fig. 8, the rotary blade 5 of the lawn mower according to the invention is a sheet saw in which a plurality of alloy sheets such as vanadium steel are provided as the sheet portion 50 on the outer circumference.

[6. Actions of the first substrate 3a and the second substrate 3b in the polishing operation]

As described above, in the polishing of the rotary blade 5 including the sheet portion 50, when the rotary blade 5 is biased in the direction of the arrow in FIG. 6, the first substrate 3a and the second substrate 3b are pressed by the polishing portion 40. Contrary to the rotary knife 5 The initial position is displaced, resulting in a deflection angle 32. If the deflection angle 32 is generated, the contact portion 50 of the rotary blade 5 and the polishing portion 40 of the polishing member 4 will generate the clearance angle 51 as shown in Fig. 8.

In the case of planar geometry, with respect to arcs and tangent lines, if the tangent is drawn toward a circle, it will intersect the radius perpendicularly at the joint. Based on this, the sheet portion 50 of the rotary blade 5 is similar to the arc position, and the respective polishing portions 40 of the first substrate 3a and the second substrate 3b are similar to the tangent. Therefore, in the state shown in FIG. 6, even if the user strongly presses the rotary blade 5 against each of the first substrate 3a and the second substrate 3b, the angle of the deflection angle 32 becomes larger. The angle of the clearance angle 51 also becomes larger.

If there is a clearance angle 51 during the polishing operation, the possibility that the blade portion 50 bites into the polishing portion 40 disappears, and the possibility of bounce (so-called kick back) at this time can be eliminated. Based on this, the user can perform the grinding operation without straining the rotating knife 5 or recoiling. Further, the user can adjust the clearance angle 51 by adjusting the force of pressing against the rotary blade 5 to adjust the state of the grinding.

1‧‧‧Mr.

10‧‧‧ bolt

12‧‧‧ nails

2‧‧‧Fixed components

20‧‧‧Fixed tablets

3a‧‧‧First substrate

3b‧‧‧second substrate

4‧‧‧Abrased components

40‧‧‧ Grinding Department

41‧‧‧ long hole

42‧‧‧ bolt

43‧‧‧ Nuts

Claims (6)

A grinder (1) for a rotary cutter (5) for a lawn mower, comprising: a first substrate (3a) having at least one end fixed; and a second substrate (3b) opposite thereto The first substrate (3a) is formed at a specific angle, and at least one end thereof is fixed; and the polishing member (4) is disposed on the first substrate (3a) and the second substrate (3b), and the rotating knife ( 5) Grinding is performed by abutting each other. A grinder according to claim 1, wherein the first substrate (3a) and the second substrate (3b) are formed of a material that can be deflected by the pressing of the rotating blade (5). The grinder of claim 1 or 2, wherein the fixed portion of the first substrate (3a) and the second substrate (3b) is only a rotating knife (5) in a rotating direction of the rotating blade (5) The coming side of the week. A grinder according to claim 1 or 2, wherein the angle between the first substrate (3a) and the second substrate (3b) is 60 to 120 degrees. A grinder according to claim 1 or 2, wherein the first substrate (3a) and the second substrate (3b) each having a rectangular shape are provided with long holes (30) in a longitudinal direction, and the polishing member ( 4) slidably movable along the longitudinal direction of the first substrate (3a) and the second substrate (3b) via the long holes (30). The grinder of claim 1 or 2, wherein the fixing member (2) fixed to each of the first substrate (3a) and the second substrate (3b) has an L-shape and is erected in the foregoing a fixing piece (20) of the fixing member (2), the fixing piece (20) having a fixing hole (21) penetrating the fixing piece (20); the first substrate (3a) and the second substrate (3b) rotating a side of the outer circumference of the rotary blade (5) in the rotation direction of the blade (5), a through hole (31); a bolt through which the fixing hole (21) and the fixing hole (31) are inserted ( 10) and a nut (11) screwed to the bolt (10), wherein the first substrate (3a) and the second substrate (3b) are respectively fixed to the fixing member (2).