JP2021104565A - Cover attachment and power tool - Google Patents

Abstract

To improve a cover attachment for a conventional power tool.SOLUTION: A cover attachment is provided to be detachably attached to a power tool comprising a tip tool configured to be rotationally driven, and a cover that partially covers the tip tool. This cover attachment comprises a first portion and a second portion made of resin. The first portion made of resin comprises: a first surface curved in an arc shape; and an edge part having a shape following the arc shape, and positioned on a first side in an extending direction of a central axis that extends parallel to the first surface through a center of the arc shape. The second portion is formed along the edge part, and extends from the edge part toward the central axis. The second portion comprises a second surface facing a second side opposite to the first side. The second surface has a metal area.SELECTED DRAWING: Figure 4

Description

The present invention relates to a technique for covering a tip tool in a power tool having a tip tool configured to be rotationally driven.

A portable power tool (hereinafter, simply referred to as a power tool) having a tip tool configured to be rotationally driven has dust and sparks generated when the work material is machined by the rotary drive tip tool. It is equipped with a metal cover (also called a wheel cover, disc cover, blade case, etc.) to suppress the problem. As such a power tool, for example, a grinder is known. The grinder is configured so that the tip tool can be removed by the user, and various types of tip tools (for example, a grindstone, a rubber pad, a brush, a blade, etc.) are prepared. Therefore, various processing operations (for example, grinding, polishing, cutting, etc.) can be performed depending on the type of tip tool to be attached.

In such a grinder, the optimum type of cover differs depending on the type of tip tool to be attached. For example, when the lower surface of the disk-shaped tip tool is pressed against the work material to perform cutting work, in the semicircular region of the tip tool (more specifically, the semicircular region on the power tool body side). A cover that covers the upper surface and the peripheral surface of the tip tool and the lower surface side is completely open is suitable. With such a cover, it is easy to avoid interference between the cover and the work material during work.

On the other hand, for example, when the outer peripheral surface of the disk-shaped tip tool is pressed against the work material to perform cutting work, the lower surface in addition to the upper surface and the peripheral surface of the tip tool is formed in the semicircular region of the tip tool. A cover that also covers is suitable. Sparks are generated during the cutting operation, but with such a cover, it is possible to prevent the sparks from scattering to the lower surface side. Further, since the outer peripheral surface of the tip tool is pressed against the work material, the portion of the cover that covers the lower surface of the tip tool does not interfere with the work material.

Therefore, it is conceivable to replace the cover according to the type of the tip tool. However, it is troublesome to replace the cover every time a different kind of work is performed. Therefore, a technique has been developed in which a cover attachment that can be easily attached and detached can be attached as needed without removing the cover that is always attached to the main body of the power tool (hereinafter, also referred to as the main body side cover). , The following Patent Documents 1 and 2).

U.S. Patent Application Publication No. 2006/0068690 German Patent Application Publication No. 102008022294

However, conventional cover attachments for power tools are made of metal or resin, leaving room for improvement. Specifically, when a resin cover attachment is used, a large amount of sparks may adhere to the inner surface of the cover attachment, and the heat may melt and damage the inner surface. When unevenness is formed by melting the inner surface, sparks are more likely to adhere, so that a vicious cycle such as easier melting may occur. On the other hand, when a metal cover attachment is used, the weight increases, which reduces the user's handleability. Alternatively, since it is difficult to mold a metal cover attachment into a curved shape with higher accuracy than a resin cover attachment, when the cover attachment is configured to have a shape suitable for the main body side cover. In other words, there is a risk that the cover attachment and the main body side cover cannot be sufficiently fitted (in other words, rattling occurs) due to the molding accuracy.

According to a first aspect of the present invention, there is provided a cover attachment for detachably attaching to a power tool comprising a tip tool configured to be rotationally driven and a cover that partially covers the tip tool. NS. The cover attachment includes a first portion and a second portion made of resin. The first portion made of resin is a first surface curved in an arc shape and an edge portion having a shape following the arc shape, and extends parallel to the first surface through the center of the arc shape. It has an edge located on the first side in the direction in which the central axis extends. The second portion is formed along the edge and extends from the edge towards the central axis. The second portion comprises a second surface facing the second side opposite to the first side. The second surface comprises a metal area.

This cover attachment can be used with a power tool having a cover having an arc-shaped portion and a plate-shaped portion. The arc-shaped portion is a portion of the tip tool for partially covering the outer edge portion along the circumferential direction around the rotation axis of the tip tool. The plate-shaped portion is a portion of the tip tool for partially covering one surface in the axial direction, which is the direction in which the rotation axis extends. More specifically, in this cover attachment, the first portion made of resin is placed on the arcuate portion so that the first surface of the first portion made of resin and the arcuate portion of the cover face each other. By doing so, the power tool is provided so that the other side surface of the tip tool in the axial direction and the second surface of the second portion face each other and partially cover the other side surface. Can be attached. When the cover attachment is attached to the power tool in this way, the second surface partially covers the other surface of the tip tool, so that sparks generated when the workpiece is cut by the tip tool are external. It is possible to suppress the scattering to. Moreover, since the first portion is made of resin, it is easier to mold it into a curved shape with higher accuracy than when it is made of metal. Therefore, when the first portion made of resin is placed on the arc-shaped portion, it is easy to form the first portion into a shape that matches the arc-shaped portion. Further, since the second surface of the second portion, that is, the surface facing the other surface of the tip tool, has a metal region, even if a spark hits the metal region, the resin The surface of the member does not melt as in the case of manufacturing. Moreover, since the cover attachment is made of resin and metal, the weight can be reduced as compared with the case where the cover attachment is made of only metal. The second surface may be formed so as to have only a metal region as a whole, or may be formed so as to partially have a metal region. For example, the second surface may include a metal region and a resin region. Further, the second portion may be formed entirely of metal alone, or may be formed of metal and resin as a whole.

According to the second aspect of the present invention, the metal region may be formed as a smooth surface. According to this aspect, sparks (in other words, high-temperature iron powder, etc.) are less likely to adhere. Therefore, it is possible to further suppress the melting of the resin portion of the cover attachment.

According to the third aspect of the present invention, the second portion may include a metal member forming a metal region and a resin member. According to this aspect, the weight of the cover attachment can be reduced as compared with the case where the second portion is made of only metal. The metal member can be arranged, for example, at a place where sparks are likely to scatter.

According to the fourth aspect of the present invention, the first portion made of resin and the metal member and the resin member of the second portion may be integrally molded. The metal member may be in a state of being partially embedded inside at least one of the first portion made of resin and the resin member. According to this aspect, the metal member does not separate from the resin member due to aged deterioration. It is also easy to manufacture.

According to a fifth aspect of the present invention, the metal member may include at least two claws that are spaced apart in the circumferential direction around the central axis. At least two claws may extend toward the second side so as to be embedded inside the first portion made of resin. According to this aspect, the first portion made of resin is placed on the arcuate portion so that the first surface of the first portion made of resin and the arcuate portion of the cover face each other, and the cover attachment is provided. When attached to the power tool, at least two claws will be located above the arcuate portion. Therefore, even if a part of the first part made of resin is melted by sparks and at least two claws embedded inside the first part are exposed, at least two claws are still present. It will be placed on the arc-shaped part. Therefore, the metal member is not displaced to the second side (that is, the tip tool side) and does not come off from the first portion. Specifically, since at least two claws are arranged apart from each other in the circumferential direction, a metal member with one claw as a fulcrum in a state where at least two claws are placed on the arcuate portion. The radial component of the displacement when the metal member is displaced to the second side and the radial component of the displacement when the metal member is displaced to the second side with the other one claw portion as a fulcrum are different from each other. Therefore, even if one of these two claws is used as a fulcrum to displace the metal member to the second side, the other claw interferes with the arcuate portion, so that the metal member Cannot be displaced to the second side. Therefore, the metal member does not displace to the second side and come off from the first portion.

According to a sixth aspect of the present invention, a power tool is provided. The power tool comprises a cover attachment of any of the above embodiments, a tip tool configured to be rotationally driven, and a cover that partially covers the tip tool. The cover is an arcuate portion of the tip tool for partially covering the outer edge along the circumferential direction of the tip tool, and a direction in which the rotation axis of the tip tool extends. It is provided with a plate-shaped portion for partially covering one side surface in the axial direction. The cover attachment is a tip tool when the first resin portion is placed on the arcuate portion so that the first surface of the first resin portion and the arcuate portion of the cover face each other. The other side surface in the axial direction of the above and the second surface of the second portion face each other, and are configured to partially cover the other side surface. According to this power tool, the same effect as that of any one of the first to fifth aspects can be obtained.

According to a seventh aspect of the present invention, there is provided a cover attachment for detachably attaching to a power tool comprising a tip tool configured to be rotationally driven and a cover that partially covers the tip tool. NS. The cover attachment comprises a plate member having a substantially fan-shaped or partially substantially torus-shaped shape. The plate member includes a first surface directed to the first side in the thickness direction of the plate member and a second surface directed to the second side opposite to the first side. The first surface comprises a metal area. The second surface comprises a resin area. According to this cover attachment, the same effect as that of the first aspect can be obtained.

According to the eighth aspect of the present invention, it can be attached to and detached from an electric tool including a substantially disk-shaped tip tool configured to be rotationally driven around a rotation axis and a cover that partially covers the tip tool. A cover attachment is provided for attachment to. This cover attachment includes a resin member and a metal member. The metal member includes a portion of the tip tool that faces a surface that intersects the axis of rotation when the cover attachment is attached to the power tool. According to this cover attachment, the same effect as that of the first aspect can be obtained.

According to a ninth aspect of the present invention, a power tool is provided. This power tool includes a cover attachment according to any one of the above embodiments, a tip tool configured to be rotationally driven around a rotation axis, and a cover that partially covers the tip tool. According to this power tool, the same effect as that of the 7th or 8th aspect can be obtained.

It is a side view of the grinder according to 1st Embodiment of this invention. It is a vertical sectional view of a grinding machine. It is a partially enlarged perspective view of the grinding machine seen from the front side. It is a perspective view which shows the cover and a cover attachment. It is a perspective view which shows the cover attachment. It is a perspective view which shows the metal member of a cover attachment. It is a perspective view which shows the state which the metal member is embedded in resin. It is a perspective view which shows the electric tool to which the cover attachment is attached. It is a top view which shows the cover attachment by 2nd Embodiment of this invention.

Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. In the following embodiment, a hand-held electric disc grinding machine (hereinafter, simply referred to as a grinding machine) 10 is exemplified as an electric tool configured to rotationally drive the tip tool.

As shown in FIG. 2, the grinder 10 is configured to rotationally drive a substantially disk-shaped tip tool 28 mounted on the spindle 25. The spindle 25 is rotated by a rotational driving force provided by the motor 31. As the tip tool 28 that can be attached to the grinder 10, a grindstone, a rubber pad, a brush, a blade, and the like are prepared. The user selects an appropriate tip tool 28 according to the desired machining operation and attaches it to the grinder 10. According to the grinder 10, processing operations such as grinding, polishing, and cutting can be performed on the work material according to the type of the tip tool 28.

In the following description, the direction in which the rotation axis of the motor 31 (in other words, the motor shaft 32) extends is defined as the front-rear direction of the grinder 10 (see FIG. 2). In the front-rear direction, the side where the tip tool 28 is located is defined as the front side, and the opposite side is defined as the rear side. Further, the direction in which the rotation axis AX1 (see FIG. 2) of the spindle 25 extends (hereinafter, also referred to as the axis direction) is defined as the vertical direction of the grinder 10. In the vertical direction, the side where the tip tool 28 is located is defined as the lower side, and the opposite side is defined as the upper side. Further, the directions orthogonal to the vertical direction and the front-back direction are defined as the horizontal direction of the grinder 10. Of the left-right directions, the right side when the front side is viewed from the rear side is defined as the right side of the grinder 10, and the opposite side is defined as the left side of the grinder 10.

As shown in FIG. 1, the grinder 10 includes a gear housing 20, a motor housing 30, and a rear housing 40. The motor 31 is housed in the motor housing 30. The motor 31 is configured to be driven by electric power supplied from the outside (although it is AC power in this embodiment, it may be DC power). The motor housing 30 is provided with a start switch 33 for starting the motor 31.

A mechanism for transmitting the rotational driving force of the motor 31 to the tip tool 28 is housed in the gear housing 20. Specifically, as shown in FIG. 2, a small bevel gear 23, a large bevel gear 24, and a spindle 25 are housed in the gear housing 20. The small bevel gear 23 is fixed around the motor shaft 32 at the front end of the motor shaft 32 of the motor 31. The spindle 25 is rotatably supported around the rotation axis AX1 by bearings arranged apart from each other in the vertical direction. The large bevel gear 24 is fixed around the spindle 25 on the upper side of the spindle 25 and meshes with the small bevel gear 23. The gear housing 20 has a cylindrical portion 22 extending in the vertical direction at the lower end portion thereof. The spindle 25 extends in the gear housing 20 in the vertical direction (in other words, in the axial direction), and extends downward from the gear housing 20 (more specifically, the cylindrical portion 22).

At the lower end of the spindle 25 extending from the gear housing 20, an inner flange 26 is attached around the spindle 25. A male screw portion is formed below the inner flange 26 of the spindle 25, and a locknut 27 is attached to the male screw portion. The position of the tip tool 28 with respect to the spindle 25 is fixed by sandwiching the tip tool 28 between the inner flange 26 and the locknut 27 and tightening the locknut 27.

When the motor 31 is driven by operating the start switch 33, the rotation of the motor shaft 32 is transmitted to the spindle 25 via the small bevel gear 23 and the large bevel gear 24 while being decelerated. At this time, the direction of the rotational movement is also changed from the direction around the motor shaft 32 to the direction around the rotation axis AX1 of the spindle 25. According to this mechanism, as the motor shaft 32 rotates, the spindle 25 is rotated around the rotation axis AX1, and as a result, the tip tool 28 fixed by the inner flange 26 and the locknut 27 is rotated together with the spindle 25. ..

As shown in FIGS. 1 to 3, the upper and rear halves of the tip tool 28 are covered by the cover 50. The cover 50 is made of metal (typically iron). More specifically, the cover 50 includes an arc-shaped portion 51, a plate-shaped portion 52, and a mounting portion 53. The arc-shaped portion 51 is formed in an arc shape having a radius larger than the radius of the substantially disk-shaped tip tool 28. The arc-shaped portion 51 partially covers the outer edge portion 28a of the tip tool 28 along the circumferential direction around the rotation axis AX1. The plate-shaped portion 52 is a plate-shaped portion extending radially inward from the upper end of the arc-shaped portion 51 over the entire arc-shaped upper end. The plate-shaped portion 52 partially covers one side surface (also referred to as an upper surface) 28b in the direction in which the rotation axis AX1 of the tip tool 28 extends.

As can be best seen in FIG. 4, the mounting portion 53 has a substantially cylindrical shape and extends upward from the plate-shaped portion 52. The cylindrical shape of the mounting portion 53 is open in the circumferential direction (in other words, it is not closed). The mounting portion 53 has two flange portions 54, 55 facing each other at two tips in the circumferential direction. As shown in FIG. 2, the mounting portion 53 is arranged so as to surround the cylindrical portion 22 of the gear housing 20. By attaching and tightening the bolts 56 to the screw holes formed in the flange portions 54 and 55, the radius of the cylindrical shape of the mounting portion 53 becomes smaller, and further, by tightening the lever 57, the radius of the cylindrical shape of the mounting portion 53. Becomes even smaller. As a result, the mounting portion 53 is fixed to the cylindrical portion 22. In this way, the cover 50 is fixed to the gear housing 20.

Since the lower side of such a cover 50 is open, it is suitable for machining work performed by pressing the other side surface (also referred to as the lower surface) 28c of the tip tool 28 in the axial direction against the work material. ing. On the other hand, in the cutting operation performed by pressing the outer edge portion 28a of the tip tool 28 against the work material, sparks are generated, so it is desirable that the lower side of the cover 50 is closed. In such a case, it is conceivable to remove the cover 50 and replace it with a cover whose lower side is also closed. However, such replacement work is troublesome. Therefore, in the present embodiment, the cover attachment 100 is used to partially cover the lower surface 28c of the tip tool 28 without replacing the cover 50.

Hereinafter, the cover attachment 100 will be described with reference to FIGS. 4 to 8. For example, as shown in FIG. 4, the cover attachment 100 includes a first portion 110, a second portion 120, and a third portion 150. The first portion 110 has an arc-shaped curved shape (in other words, a partially tubular shape). The first portion 110 has a first surface 111 curved in an arc shape. The first surface 111 is formed in a shape that follows the arcuate portion 51 of the cover 50. In the present embodiment, the portion of the first portion 110 on the outer side in the radial direction (opposite to the first surface 111) is formed in an arc shape that follows the first surface 111, but has an arbitrary shape. You may be doing it.

The first portion 110 further has an edge 112. The edge portion 112 has a shape that follows the arc shape of the first surface 111. The edge portion 112 is located on the first side in the direction in which the central axis AX2 extending parallel to the first surface 111 passes through the arc-shaped center CP of the first surface 111. In other words, "extending parallel to the first surface 111" means extending in a direction orthogonal to all the radial directions of the arc shape of the first surface 111. The first portion 110 is made of resin. In the present application, "resin" means a resin in a broad sense, and may include rubber and an elastomer in addition to plastic. The first portion 110 has a protruding portion 113 protruding toward the central axis AX2 at one end of the arc shape of the first portion 110.

The second portion 120 is formed along the edge portion 112 and extends from the edge portion 112 toward the central axis AX2. In the present embodiment, the second portion 120 has a substantially fan-shaped partial torus shape in which the vicinity of the central CP is cut out in a substantially fan shape, but the second portion 120 may be formed in a substantially fan shape. The second portion 120 includes a metal member 130 and a resin member 140. Although the metal member 130 is made of iron in this embodiment, it is made of any metal (eg, body, aluminum, stainless steel, titanium, etc.) that has a higher melting point than the resin that forms the first portion 110. May be.

The second portion 120 includes a second surface 121 directed to the second side (in other words, the side opposite to the edge 112) in the direction in which the central axis AX2 extends. The second surface 121 includes a metal region 122 and a resin region 123. The metal region 122 is formed by the metal member 130, and the resin region 123 is formed by the resin member 140. Each of the metal region 122 and the resin region 123 is formed as a smooth surface. The metal region 122 has a partially torus shape. The resin region 123 is a portion of the second surface 121 other than the metal region 122. The metal region 122 is located behind the resin region 123 when the cover attachment 100 is attached to the cover 50 according to an embodiment described later. In other words, the metal region 122 is located closer to the arc-shaped center point MP of the first surface 111 than the resin region 123 when viewed in the direction in which the central axis AX2 extends.

As shown in FIG. 6, the metal member 130 is a plate-shaped member. More specifically, the metal member 130 includes a plate-shaped main body 131 having a partially torus shape, two step portions 132a and 132b, and three claw portions 133a to 133c. The two step portions 132a and 132b are portions that are bent in a stepped shape and are formed along the radial direction. The three claw portions 133a to 133c are arranged apart from each other in the circumferential direction around the central axis AX2. The three claw portions 133a to 133c extend from the outer circumference of the main body 131 in the thickness direction of the main body 131. In other words, the three claw portions 133a to 133c extend toward the second side (see FIGS. 4 and 7).

As shown in FIG. 4, the resin member 140 is a plate-shaped member having a partially torus shape, and is formed over a central angle larger than that of the metal member 130. The resin member 140 is formed along the edge portion 112 of the first portion 110, and extends from the edge portion 112 toward the central axis AX2.

The third portion 150 extends from the second side edge of the first portion 110 toward the central axis AX2 substantially parallel to the second portion 120. The third portion 150 is formed so that the extending distance toward the central axis AX2 is smaller than that of the second portion 120. The third portion 150 has two elastic portions 151. The elastic portion 151 is configured to have elasticity that can be displaced in the direction in which the central axis AX2 extends by being cut out from the periphery in a substantially U shape. The elastic portion 151 is configured to project toward the first side of the third portion 150 with respect to the other portions. When the cover attachment 100 is attached to the cover 50, the elastic portion 151 elastically contacts the plate-shaped portion 52 of the cover 50 to suppress rattling of the cover attachment 100. The third portion 150 is made of resin.

In the present embodiment, the first portion 110, the resin member 140, and the third portion 150 are formed of the same resin material and are integrally molded. Further, in the present embodiment, the metal member 130, the first portion 110, the resin member 140, and the third portion 150 are integrally molded. More specifically, the metal member 130 is made of the first portion 110 and the resin when the first portion 110, the resin member 140 and the third portion 150 are resin molded (for example, injection molded). It is partially embedded inside the member 140. In the present embodiment, the step portions 132a and 132b of the metal member 130 are embedded in the resin member 140, and the claw portions 133a to 133c are embedded in the first portion 110. In FIG. 7, the embedded step portions 132a and 132b and the claw portions 133a to 133c are shown by dotted lines. The metal member 130 is exposed only in the metal region 122 shown in FIG. According to such integral molding, the metal member 130 does not separate from the first portion 110 and the resin member 140 due to aged deterioration. It is also easy to manufacture.

The cover attachment 100 described above can be attached to the cover 50 as follows. The cover attachment 100 is placed on the cover 50 so that the first surface 111 of the first portion 110 and the arcuate portion 51 of the cover 50 face each other. At this time, the cover attachment 100 is arranged so that the one end portion 51a of the arc shape of the arc-shaped portion 51 of the cover 50 abuts on the protruding portion 113 of the first portion 110 inside the cover attachment 100. NS. As a result, the cover attachment 100 is restricted from rotating in one side in the circumferential direction with respect to the cover 50.

As described above, since the first surface 111 of the first portion 110 has an arc shape that follows the arc-shaped portion 51 of the cover 50, the first surface 111 is placed on the arc-shaped portion 51. It is placed closely. At this time, the rotation axis AX1 is substantially coaxial with the center axis AX2. In this state, by operating the engaging mechanism 160 provided in the first portion 110, the engaging claw 161 of the engaging mechanism 160 is changed to the other end of the arc shape of the arc-shaped portion 51 of the cover 50. Engage with 51b. This also restricts the cover attachment 100 from rotating to the other side in the circumferential direction with respect to the cover 50.

When the cover attachment 100 is fixed to the cover 50 in this way, the second portion 120 has the lower surface 28c of the tip tool 28 and the second surface 121 of the second portion 120 facing each other. , The lower surface 28c will be partially covered. FIG. 8 shows a state in which the cover attachment 100 is attached and the lower surface 28c is partially covered. In FIG. 8, the grip 29 is attached to the grip attachment hole 21 (see FIG. 1) formed in the gear housing 20.

According to the grinder 10 described above, by attaching the cover attachment 100 detachably, the cover 50 partially covers the upper surface 28b of the tip tool 28, and the second portion 120 of the cover attachment 100 is the lower surface of the tip tool 28. A state in which 28c is partially covered is obtained. Therefore, it is possible to prevent sparks generated when the work piece is cut by the tip tool 28 from scattering to the outside. Moreover, since the first portion 110 is made of resin, it is molded so that the arc shape of the first surface 111 accurately matches the arc shape of the arc-shaped portion 51 as compared with the case where it is made of metal. Is easy. Further, the second surface 121 of the second portion 120 (that is, the surface facing the lower surface 28c of the tip tool 28) includes the metal region 122, so that even if the metal region 122 is hit by a spark, The surface of the member does not melt as in the case of resin. Moreover, since the cover attachment 100 is made of resin and metal, the weight can be reduced as compared with the case where the cover attachment 100 is made of only metal.

Further, since the metal region 122 is formed as a smooth surface, it is difficult for sparks to adhere to it. Therefore, it is possible to further suppress the melting of the resin portion of the cover attachment 100.

Further, the metal member 130 includes claw portions 133a to 133c. Since the claw portions 133a to 133c extend in the first portion 110 toward the second side, the claw portions 133a to 133c are attached to the cover 50 when the cover attachment 100 is attached to the cover 50. It will be located above the arcuate portion 51. Therefore, even if a part of the first portion 110 is melted by the spark and the claw portions 133a to 133c are exposed, the claw portions 133a to 133c are placed on the arcuate portion 51. .. Since the claw portions 133a to 133c are arranged apart from each other in the circumferential direction, the metal member 130 is second with each claw portion as a fulcrum in a state where the claw portions 133a to 133c are placed on the arcuate portion 51. The radial components of the displacement when displaced to the side are different from each other. Therefore, even if the metal member 130 is to be displaced to the second side with one claw as a fulcrum, the other two claws interfere with the arcuate portion 51, so that the metal member 130 is the second. Cannot be displaced to the side. This effect can be obtained if two or more claws are provided.

Further, at the time of shipment, when the replacement cover covering both sides of the tip tool 28 is packed together with the grinder 10 in addition to the cover 50, the volume required for packing is increased by the amount of the replacement cover. On the other hand, according to the cover attachment 100 described above, if the grinder 10 is packed with the cover attachment 100 attached, the grinder 10 can be packed compactly.

Hereinafter, the cover attachment 200 according to the second embodiment of the present invention will be described. As shown in FIG. 9, the cover attachment 200 is formed as a plate member having a partially torus shape. The cover attachment 200 includes a metal member 230 and a resin member 240. The cover attachment 200 includes a first surface 221 which is one side surface in the thickness direction thereof, and a second surface 225 which is the other side surface. The first surface 221 includes a metal region 222 and a resin region 223. The second surface 225 is entirely made of resin only. Further, the resin member 240 has notches 241,242 at both ends of the arc shape.

The cover attachment 200 is attached to the cover by inserting it into a slot provided in the cover of the grinder. With the cover attachment 200 inserted in the slot, the cover attachment 200 is prevented from rotating with respect to the cover by abutting the notches 241,242 with bolts that radially penetrate the cover of the grinder.

In the state where the cover attachment 200 is attached in this way, the first surface 221 faces the lower surface of the tip tool and partially covers the lower surface. Since the first surface 221 has the metal region 222, the same effect as that of the first embodiment can be obtained. As is clear from this, the cover attachment according to the embodiment of the present invention is not limited to the shape exemplified as the first embodiment, but includes a resin member and a portion facing the lower surface of the tip tool. It can be realized as a cover attachment having a metal member and a known arbitrary shape.

Although some embodiments of the present invention have been described above, the above-described embodiments are for facilitating the understanding of the present invention and do not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention includes equivalents thereof. In addition, in the scope of claiming and any combination of each element described in the specification, or any omission, within the range in which at least a part of the above-mentioned problems can be solved, or in the range in which at least a part of the effect is exhibited. It is possible.

For example, in the first embodiment, the resin member 140 may have a support structure that supports the metal member 130 in a locked state, and the metal member 130 may be detachably attached to the resin member 140. Alternatively, the entire second surface 121 may be formed by the metal region 122. Alternatively, the entire second portion 120 may be made entirely of metal. Alternatively, the cover attachment 100 may be attached to a portion of the grinder 10 other than the cover 50. For example, a cover attachment that can be attached using the grip attachment hole 21 may be adopted.

10 ... Grinder 20 ... Gear housing 21 ... Grip mounting hole 22 ... Cylindrical part 23 ... Small bevel gear 24 ... Large bevel gear 25 ... Spindle 26 ... Inner flange 27 .. Locknut 28 ... Tip tool 28a ... Outer edge 28b ... Upper surface 28c ... Lower surface 29 ... Grip 30 ... Motor housing 31 ... Motor 32 ... Motor shaft 33 .. Start switch 40 ... Rear housing 50 ... Cover 51 ... Arc-shaped part 51a, 51b ... End 52 ... Plate-shaped part 53 ... Mounting part 54 ... Flange part 56. .. Bolt 57 ... Lever 100 ... Cover Attachment 110 ... First Part 111 ... First Surface 112 ... Edge 113 ... Protruding 120 ... Second Part 121 ... Second surface 122 ... Metal area 123 ... Resin area 130 ... Metal member 131 ... Main body 132a, 132b ... Steps 133a, 133b, 133c ... Claw part 140 ... Resin member 150 ... Third part 151 ... Elastic part 160 ... Engagement mechanism 161 ... Engagement claw 200 ... Cover attachment 221 ... First Surface 222 ... Metal area 223 ... Resin area 225 ... Second surface 230 ... Metal member 240 ... Resin member 241 ... Notch CP ... First surface Center of arc shape MP ... Center point of arc shape of first surface AX1 ... Rotation axis AX2 ... Center axis

Claims (9)

A cover attachment for detachably attaching to a power tool including a tip tool configured to be rotationally driven and a cover that partially covers the tip tool.
A first surface curved in an arc shape and an edge having a shape following the arc shape, and a central axis extending parallel to the first surface through the center of the arc shape extends. A first portion made of resin having an edge located on the first side in the direction of
A second portion formed along the edge and extending from the edge toward the central axis.
The second portion comprises a second surface facing the second side opposite to the first side.
The second surface is a cover attachment with a metal area. The cover attachment according to claim 1.
The metal area is a cover attachment formed as a smooth surface. The cover attachment according to claim 1 or 2.
The second portion is a cover attachment including a metal member forming the metal region and a resin member. The cover attachment according to claim 3.
The first portion made of resin, the metal member of the second portion, and the resin member are integrally molded, and the metal member is the first portion made of resin and the resin member. A cover attachment that is partially embedded inside at least one of the resin members. The cover attachment according to claim 4.
The metal member is at least two claw portions arranged apart from each other in the circumferential direction around the central axis, and is located on the second side so as to be embedded inside the first portion made of resin. A cover attachment with at least two claws extending towards it. It ’s a power tool,
The cover attachment according to any one of claims 1 to 5.
With the tip tool
With the cover
The cover has an arcuate portion for partially covering the outer edge of the tip tool along the circumferential direction around the rotation axis of the tip tool, and the rotation axis of the tip tool extends. A plate-shaped portion for partially covering one side surface in the axial direction, which is the existing direction, is provided.
In the cover attachment, the resin-made first portion is placed on the arc-shaped portion so that the first surface of the resin-made first portion and the arc-shaped portion of the cover face each other. When this is done, the other surface of the tip tool in the axial direction and the second surface of the second portion face each other, and the other surface is partially covered. Power tool configured to. A cover attachment for detachably attaching to a power tool including a tip tool configured to be rotationally driven and a cover that partially covers the tip tool.
With a plate member having a substantially fan shape or a partially torus shape,
The plate member includes a first surface directed to a first side in the thickness direction of the plate member and a second surface directed to a second side opposite to the first side.
The first surface comprises a metal area and
The second surface is a cover attachment having a resin area. A cover attachment for detachably attaching to an electric tool including a tip tool configured to be rotationally driven around a rotation axis and a cover that partially covers the tip tool.
With resin members
Equipped with metal parts,
The metal member is a cover attachment including a portion of the tip tool facing a surface of the tip tool that intersects the rotation axis when the cover attachment is attached to the power tool. It ’s a power tool,
The cover attachment according to claim 7 or 8.
With the tip tool
A power tool with the cover.

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