TWI690386B - abrader - Google Patents

Abstract

The present invention provides a grinder (1) that can even respond to the change in the outer diameter of the rotary knife (5) without the need to provide a guide part that extracts the center point of the rotary knife (5).

In order to solve this problem, the grinder (1) is a grinder (1) used for a rotary blade (5) of a lawn mower, and is characterized by comprising: a first substrate (3a), at least one end of which is fixed The second substrate (3b), which forms a specific angle with respect to the first substrate (3a), and at least one end is fixed; and the polishing member (4), which is provided on the first substrate (3a) and the first The second substrate (3b) is in contact with the outer periphery of the rotary blade (5) and polished.

Description

abrader

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

Previously, weeding machines (mowers) with a prime mover were used in the removal of weeds. The prime mover used fossil fuel or electricity. Generally speaking, a lawnmower is equipped with a handle for the user to grip near the center of the main tube, a prime mover is installed at the rear end of the main tube, and a rotary blade is installed at the front end thereof. If the sharpness of this rotating knife is not good, it needs to be removed and ground.

In view of the fact that the removal and installation work of the rotary blade is complicated, the industry has invented a rotary rotary blade cutter grinding device that does not need to remove the rotary blade, but uses the rotation derived from the motive of the mower (for example, Patent Document 1).

However, in the previous rotary cutter grinding device, the outer diameter of the rotary cutter and the curvature of the grinding surface are inconsistent, or it is necessary to provide a guide part that extracts the center point of the rotary cutter, so that the rotary cutter used is limited, and the number of parts It also leads to high prices.

[Advanced technical literature] [Patent Literature]

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

Therefore, the object of the present invention is to provide a grinder that not only can even correspond to the change in the outer diameter of the rotary knife, but also does not require a guide part for extracting and extracting the center point of the rotary knife.

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

(Invention for the first patent application)

The invention claimed in item 1 of the patent scope is a grinder, which is a rotary blade for a lawnmower, characterized by comprising: a first substrate, at least one end of which is fixed; a second substrate, which is opposite to the first The substrate forms a specific angle, and at least one end is fixed; and a polishing member, which is provided on the first substrate and the second substrate, is in contact with the outer periphery of the rotary blade for polishing, the first substrate and the second The substrate is made of It is formed by the material that deflects and deflects.

(Invention applying for patent No. 2)

The invention claimed in item 2 is the invention claimed in item 1, in which the fixing positions of the first substrate and the second substrate are only the outer side of the rotating blade in the rotating direction of the rotating blade .

(Invention for the third item of patent scope)

The invention of claim 3 is in the grinder of claim 1 or claim 2, and the angle formed by the first substrate and the second substrate is 60 degrees to 120 degrees.

(Invention applying for invention in item 4)

The invention of claim 4 is in the polisher of claim 1 or claim 2, and the first substrate and the second substrate each formed of a rectangle are provided with long holes along the longitudinal direction, and the polishing member It can slide along the longitudinal direction of the first substrate and the second substrate through the long holes.

(Invention applying for invention in item 5)

The invention of claim 5 is in the grinder of claim 1 or claim 2. The fixing members fixed to the first substrate and the second substrate are L-shaped, and are provided with The fixing piece of the fixing member, the fixing piece having a fixing hole penetrating the fixing piece; the first substrate and the second substrate are provided with a penetrating fixing hole on the arrival side of the outer periphery of the rotating blade in the rotating direction of the rotating blade; By inserting the fixing hole and the fixing hole of the bolt and the screw For the screw cap screwed together, the first substrate and the second substrate are respectively fixed to the fixing member.

(Effects of applying for the invention in item 1 of the patent scope)

If the invention of the first patent application is used, the arc of the outer circumference of the rotary blade will enter the space where the angle is given and becomes a specific angle, so it can be provided in addition to the change in the outer diameter of the rotary blade. It is necessary to extract the grinder that guides the center part of the rotary knife. In addition, the deflection angle is generated due to the elastic deformation of the first substrate and the second substrate. Thereby, a clearance angle is generated when the polishing portion of the polishing member contacts the sheet portion. By changing the angle of the clearance angle, it is possible to perform grinding corresponding to the adjustment of the pressure force. In this way, the user can perform the grinding operation without nerve damage to the rotating knife.

(Effects of the invention claimed in item 2)

In the invention of claim 2 of the patent application range, the contact position between the first substrate and the second substrate and the outer periphery of the rotary blade becomes the arrival side of the outer periphery of the rotary blade In this case, the abutting position is in the clockwise direction), and it acts synergistically with the elastic deformation of the first substrate and the second substrate to perform a more appropriate grinding operation.

(Effects of the invention claimed in item 3)

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

(Effects of the invention claimed in item 4)

In the case of the invention set forth in claim 4 of the patent application range, even if the polishing portion of the polishing member is partially worn, by sliding the position of the polishing member to correspond to the length of the long hole, the unworn portion can be used. Thereby, the period of use of the abrasive member can be increased.

(Effects of applying for the invention in item 5 of the patent scope)

If it is set up as the invention claimed in item 5, it is possible to form an L-shaped plate and two substrates (first substrate and second substrate).

1: grinder

10: Bolt

11: Nut

12: Nail

2: fixed member

20: fixed piece

21: fixing hole

22: Base fixing hole

3a: the first substrate

3b: second substrate

30: Long hole

31: Fixing hole

32: deflection angle

4: Abrasive components

40: Grinding department

41: Long hole

42: Bolt

43: Nut

5: rotary knife

50: film department

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 aforementioned second substrate.

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

FIG. 5 is an overall plan view of the fixing member, the first substrate, and the aforementioned second substrate.

Fig. 6 is a plan view showing the start of the polishing operation.

Fig. 7 is a plan view showing the polishing operation.

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

Hereinafter, the grinder 1 of the present invention and the drawings shown as examples will be described.

[Example 1] [1. About 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 3 a, a second substrate 3 b, and a polishing member 4. As shown in FIG. 2, the ends of the fixing member 2 and the first substrate 3a and the second substrate 3b are fixed by the screwing of the bolt 10 and the nut 11, and the entire grinder 1 is installed on the base by the nail 12 ( Floor or floor surface).

By arranging and fixing the specific angles of the first substrate 3a and the second substrate 3b at 60° to 120° (preferably 80° to 100°), the grinding members 4 and the rotary blade 5 of the lawn mower each contact. In each drawing, the best specific angle is 90°.

[2. Related fixing member 2]

FIG. 3 shows the fixing member 2 and the first substrate 3a and the second substrate 3b. 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 an overall plan view of the fixing member 2 and the first substrate 3a and the second substrate 3b.

As shown in FIGS. 1 to 5, the fixing member 2 is provided on the base (ground or floor surface), and it is an L-shaped metal piece. 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 FIG. 3 to FIG. 5, a fixing piece 20 is vertically arranged on the inner long side of the inner short side, and a fixing piece 20 is formed on the other end side of the inner long side instead of the inner short side. In other words, regarding both the inside short side and the inside long side, the fixing pieces 20 are formed at the ends of the clockwise running direction side as viewed from above. With this, the fixing piece 20 is set to be viewed from above, on the arrival side of the outer periphery of the rotary blade 5 in the rotation direction of the counterclockwise rotary blade 5.

In addition, the fixing pieces 20 respectively extend vertically upward relative to the plane of the fixing member 2 and are provided with fixing holes 21 penetrating through 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 outer short side and the outer long side of the L-shaped shape of the fixing member 2, the outer long side is not near one end of the outer short side, and the outer short side The reason is that there is a base fixing hole 22 near one end of the outer long side. The shaft of the nail 12 is inserted into the base fixing hole 22.

An example of the fixing member 2 is a metal plate such as stainless steel, and the fixing piece 20 can be provided by bending.

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

As shown in FIGS. 1 to 4, the first substrate 3 a and the second substrate 3 b respectively include long holes 30 and fixing holes 31.

The long hole 30 is provided along the longitudinal direction of the first substrate 3a and the second substrate 3b, and is provided near the upper end portion and the lower end portion of the substantially center of the rectangular first substrate 3a and the second substrate 3b. In this way, the mounting position of the polishing member 4 can be slid with respect to the longitudinal direction of the first substrate 3a and the second substrate 3b.

The fixing hole 31 is provided in each of the first substrate 3a and the second substrate 3b, and is only provided at the end of the outer periphery of the rotating blade 5 in the rotating direction of the rotating blade 5 (viewed from above, running side clockwise) nearby. Generally speaking, the rotating blade 5 of the lawn mower rotates counterclockwise when viewed from above, so that the fixed positions of the first substrate 3a and the second substrate 3b are in the longitudinal direction of the first substrate 3a and the second substrate 3b. In the middle, the contact position of the grinding member 4 and the rotary blade 5 is the arrival side of the rotary blade 5.

Here, the distance near the end is within the range of 3% to 9% of the length distance between the first substrate 3a and the second substrate 3b. In FIGS. 1 to 7, a fixing hole 31 is provided at a position that advances by 6% of the length distance from the end of the rotating blade 5 toward the running direction of the rotating blade 5. If the fixing hole 31 is a long hole provided 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. About abrasive member 4]

As shown in FIGS. 1 and 2, the polishing member 4 is attached to the approximate center of each of the first substrate 3a and the second substrate 3b, and to the approximate center of the respective short sides of the first substrate 3a and the second substrate 3b The polishing part 40 is provided, and the long hole 41 is provided in the vicinity of both ends. Here, the distance near both ends is in the range of 7% to 13% of the distance between the short sides of the first substrate 3a and the second substrate 3b. In FIGS. 1 and 2, the distance from the end 10% is set to the center of the long hole 41.

The polishing section 40 is a grindstone, ceramic, or the like, and is used to polish the outer periphery of the rotary blade 5.

The long hole 41 further increases the sliding amount of the polishing member 4 from the long hole 30. In this way, even if the grinding portion 40 is partially worn, the position of the grinding member 4 can be slid according to the combined length of the long hole 30 and the long hole 41, and the unworn portion of the grinding portion 40 can be positioned, and the bolt 42 and the nut 43 can be positioned. Screwed and fixed. As a result, the use period of the polishing member 4 can be increased (the replacement period is shortened). In addition, when the polishing member 4 is bonded to the first substrate 3a and the second substrate 3b without using the screwing of the bolt 42 and the nut 43, the fixing 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]

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

Lawn mower (general lawn mower, unlimited terrain lawn mower) is a machine used to cut grass or small-diameter trees. The structure of the lawn mower is composed of the prime mover (motor, engine), main tube (shaft, rod), and rotary blade (blade saw). The operator operates the handle fixed to the main tube to cut the grass. Generally speaking, the right-hand part 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, there is a centrifugal clutch with the drive shaft, which can prevent the useless rotation of the teeth at start/idle speed, and also prevent the teeth from stopping due to biting into the grass.

The grinding operation is shown in FIG. 6, the user presses the unrotated rotary blade 5 against the grinder 1 described below in the idle state, and the user turns on the engine in the state shown in FIG. 7 The throttle valve uses the rotational force of the lawn mower to grind the rotary blade 5.

In addition, in the present invention, as shown in FIG. 8, the rotary blade 5 used in the lawn mower of the present invention is a blade saw that is provided with a plurality of alloy sheets of vanadium steel or the like on the outer periphery as the sheet portion 50.

[6. About the operation 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 provided with the sheet portion 50, if a force is applied 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 Displacement from the original position against the rotary blade 5 produces a deflection angle 32. If this deflection angle 32 occurs, the contact angle between the blade portion 50 of the rotary blade 5 and the polishing portion 40 of the polishing member 4 will produce a clearance angle 51 as shown in FIG. 8.

In terms of plane geometry, with regard to arcs and tangents, if the tangent is pulled To the circle, it will intersect the radius perpendicularly at the joint. Based on this, the blade portion 50 of the rotary blade 5 is approximately in the position of the circular arc, and the polishing portion 40 of each of the first substrate 3a and the second substrate 3b is approximately tangent. Therefore, in the state shown in FIG. 6, even if the user presses the rotary blade 5 against each of the first substrate 3a and the second substrate 3b with great force, the angle of the deflection angle 32 becomes larger The angle of the clearance angle 51 will also become larger.

If there is a clearance angle 51 during the polishing operation, the possibility that the blade of the sheet portion 50 bites into the polishing portion 40 disappears, and the possibility of bouncing (so-called kick back) at that time can also be eliminated. Based on this, the user can perform the grinding operation without nerve damage to the rotary knife 5 or backlash. Furthermore, the user can also adjust the clearance angle 51 by adjusting the force pressed against the rotary blade 5 to adjust the state of grinding.

1‧‧‧Grinder

10‧‧‧bolt

12‧‧‧ nails

2‧‧‧Fixed member

20‧‧‧Fixed film

3a‧‧‧The first substrate

3b‧‧‧Second substrate

4‧‧‧Abrasive components

40‧‧‧Grinding Department

41‧‧‧Long hole

42‧‧‧bolt

43‧‧‧ Nut

Claims (5)

A grinder (1), which is a rotary blade (5) for a lawnmower, is characterized by comprising: a first substrate (3a), at least one end of which is fixed; a second substrate (3b), which is opposite The first substrate (3a) forms a specific angle, and at least one end is fixed; and an abrasive member (4), which is provided on the first substrate (3a) and the second substrate (3b), and the rotary blade ( 5) The outer periphery contacts and polishes. The first substrate (3a) and the second substrate (3b) are formed of a material that can be flexed by the pressure of the rotating blade (5). As for the grinder of claim 1, the fixing parts of the first substrate (3a) and the second substrate (3b) are only the outer periphery of the rotating blade (5) in the rotating direction of the rotating blade (5) The arrival side. For example, the grinder of claim 1 or 2, wherein the angle formed by the first substrate (3a) and the second substrate (3b) is 60 degrees to 120 degrees. For example, the polisher according to item 1 or 2 of the patent application scope, wherein the first substrate (3a) and the second substrate (3b) each composed of a rectangle are provided with a long hole (30) along the longitudinal direction, and the polishing member ( 4) It can slide along the longitudinal direction of the first substrate (3a) and the second substrate (3b) through the long hole (30). If the grinder of item 1 or 2 of the patent application scope The fixing member (2) fixed to each of the first substrate (3a) and the second substrate (3b) is L-shaped, and includes a fixing piece (20) erected on the fixing member (2), and the fixing piece (2) 20) A fixing hole (21) penetrating the fixing piece (20); the outer periphery of the rotating blade (5) of the first substrate (3a) and the second substrate (3b) in the rotating direction of the rotating blade (5) The arrival side is provided with a through fixing hole (31); a bolt (10) inserted through the fixing hole (21) and the fixing hole (31) and a nut (11) screwed with the bolt (10) ), the first substrate (3a) and the second substrate (3b) are respectively fixed to the fixing member (2).

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