POWER TOOL, COVER UNIT AND ADDITIONAL COVER

Abstract

A power tool may comprise a motor, a power transmission mechanism coupled to the motor, a housing that accommodates the motor and the power transmission mechanism, a retaining element coupled to the power transmission mechanism, a tip tool held by the retaining element and rotatable about an axis of rotation, and a cover assembly. The cover assembly may comprise a main cover attached to the housing that covers at least part of the tip tool, and an auxiliary cover that is removably attached to the main cover. The auxiliary cover may comprise a cover body, a first contact element supported by the cover body and having a first flat contact surface, and a second contact surface supported by the cover body and having a second flat contact surface inclined relative to the first flat contact surface.The distance between the first contact component and the second contact component can be adjusted.

Description

TECHNICAL AREA

[0001] The technology disclosed herein relates to a power tool, a cover unit and an additional cover. STATE OF THE ART

[0002] The publication of U.S. Patent Application No. 2022 / 0203499 discloses a power tool. The power tool comprises a motor, a power transmission mechanism coupled to the motor, a housing that accommodates the motor and the power transmission mechanism, a retaining element coupled to the power transmission mechanism, a tip tool held by the retaining element and rotatable about a pivot axis, and a cover assembly. The cover assembly comprises a main cover attached to the housing that covers at least part of a tip tool, and an auxiliary cover that is removably attached to the main cover. The auxiliary cover comprises a cover body and a contact element supported by the cover body, which has a first flat contact surface and a second flat contact surface inclined relative to the first flat contact surface. SUMMARY

[0003] It may be desirable to modify the positional relationship between the first and second flat contact surfaces according to the forming of workpieces. The force tool described above requires a complete replacement of the contact component to change the positional relationship between the first and second flat contact surfaces. The disclosure herein provides a technology that enables a change in the positional relationship between a first and second flat contact surface without requiring a component replacement.

[0004] A power tool disclosed herein comprises a motor, a power transmission mechanism coupled to the motor, a housing that accommodates the motor and the power transmission mechanism, a retaining element coupled to the power transmission mechanism, a tip tool held by the retaining element and rotatable about an axis of rotation, and a cover assembly. The cover assembly may include a main cover attached to the housing that covers at least part of the tip tool, and an additional cover that is removably attached to the main cover.The additional cover can comprise a cover body, a first contact element supported by the cover body and having a first flat contact surface, and a second contact element supported by the cover body and having a second flat contact surface inclined relative to the first flat contact surface. The distance between the first and second contact elements can be adjustable.

[0005] A cover unit for a power tool disclosed herein may comprise a main cover and an auxiliary cover attached to the main cover. The auxiliary cover may comprise a cover body, a first contact element supported by the cover body and having a first flat contact surface, and a second contact element supported by the cover body and having a second flat contact surface inclined relative to the first flat contact surface. The distance between the first contact surface and the second contact surface may be adjustable.

[0006] An additional cover for a cover unit for a power tool disclosed herein may comprise a cover body, a first contact element supported by the cover body and having a first flat contact surface, and a second contact element supported by the cover body and having a second flat contact surface inclined relative to the first flat contact surface. The distance between the first contact element and the second contact element may be adjustable.

[0007] The configurations described above allow a change in the positional relationship between the first flat contact surface and the second flat contact surface without requiring a component exchange. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view of a power tool 2 according to a first embodiment, as seen from the upper front right side. Fig. Figure 2 is a longitudinal cross-sectional view of a front area of ​​the power tool 2 according to the first embodiment. Fig. Figure 3 is a perspective view of a cover unit 6 according to the first embodiment, as seen from the upper front left side. Fig. Figure 4 is a perspective view of the cover unit 6 according to the first embodiment, when viewed from the upper front left side, with an additional cover 60 separated from a main cover 58. Fig. Figure 5 is a perspective view of a cover body 70 of the additional cover 60 according to the first embodiment, when viewed from the lower rear left side. Fig. Figure 6 is a perspective exploded view of the additional cover 60 according to the first embodiment, as seen from the upper rear left side. Fig. Figure 7 is a longitudinal cross-sectional view of a locking component 26 of the additional cover 60 according to the first embodiment. Fig. Figure 8 is a perspective view of the additional cover 60 according to the first embodiment, when viewed from the lower rear right side, wherein a distance between a first contact component 80 and a second contact component 82 is reduced. Fig. Figure 9 is a perspective view of the additional cover 60 according to the first embodiment, when viewed from the lower rear right side, with the distance between the first contact component 80 and the second contact component 82 being increased. Fig. Figure 10 is a right side view of the front area of ​​the power tool 2 according to the first embodiment. Fig. Figure 11 is a perspective view of a power tool 102 according to a second embodiment, as seen from the upper front right side. Fig. Figure 12 is a perspective view of a cover unit 104 according to the second embodiment, as seen from the upper rear left side. Fig. Figure 13 is a perspective view of the cover unit 104 according to the second embodiment, when viewed from the upper rear left side, with an additional cover 106 separated from a main cover 58. Fig. Figure 14 is a perspective view of a cover body 108 of the additional cover 106 according to the second embodiment, when viewed from the lower rear left side. Fig. Figure 15 is a perspective view of the additional cover 106 according to the second embodiment, when viewed from the lower right rear side. Fig. Figure 16 is a perspective view of a ruler unit 136 according to the second embodiment. Fig. Figure 17 is another perspective view of the ruler unit 136 according to the second embodiment. Fig. Figure 18 is a perspective view of a movable plate 140 of the ruler unit 136 according to the second embodiment. Fig. Figure 19 is a longitudinal cross-sectional view of the power tool 102 according to the second embodiment and shows how a chamfer size C is measured by the ruler unit 136, wherein the distance between a first contact component 80 and a second contact component 82 is reduced. Fig. Figure 20 is a cross-sectional view of the power tool 102 according to the second embodiment and shows how the chamfer size C is measured by the ruler unit 136, with the distance between the first contact component 80 and the second contact component 82 being increased. DETAILED DESCRIPTION

[0008] Representative, non-limiting examples of the present disclosure are described in detail below with reference to the accompanying drawings. This detailed description is intended solely to provide a person skilled in the art with further details for carrying out preferred aspects of the present teachings and is not intended to limit the scope of protection of the present disclosure. Furthermore, each of the additional features and teachings disclosed below can be used separately or in combination with other features and teachings to provide improved power tools, cover units and additional covers, and methods for manufacturing and using the same.

[0009] Furthermore, combinations of features and steps described in detail below may not be necessary to carry out the present disclosure in the broadest sense and are instead taught only to describe preferred examples of the present disclosure in particular. Moreover, various features of the representative examples and of the independent and dependent claims described above and below may be combined in ways not specifically and explicitly listed to provide additional usable embodiments of the present teachings.

[0010] All features disclosed in the description and / or the claims shall be considered separate and independent of one another for the purpose of original disclosure and also for the purpose of limiting the claimed invention, irrespective of the combination of features in the embodiments and / or the claims. Furthermore, all range specifications or specifications of groups of units shall disclose any possible intermediate value or subgroups of units for the purpose of original disclosure and also for the purpose of limiting the claimed invention.

[0011] A power tool disclosed herein comprises a motor, a power transmission mechanism coupled to the motor, a housing that accommodates the motor and the power transmission mechanism, a retaining element coupled to the power transmission mechanism, a tip tool held by the retaining element and rotatable about an axis of rotation, and a cover assembly. The cover assembly may include a main cover attached to the housing that covers at least part of the tip tool, and an additional cover that is removably attached to the main cover.The additional cover can comprise a cover body, a first contact element supported by the cover body and having a first flat contact surface, and a second contact element supported by the cover body and having a second flat contact surface inclined relative to the first flat contact surface. The distance between the first and second contact elements can be adjustable.

[0012] A cover unit for a power tool disclosed herein may comprise a main cover and an auxiliary cover attached to the main cover. The auxiliary cover may comprise a cover body, a first contact element supported by the cover body and having a first flat contact surface, and a second contact element supported by the cover body and having a second flat contact surface inclined relative to the first flat contact surface. The distance between the first contact surface and the second contact surface may be adjustable.

[0013] An additional cover for a cover unit for a power tool disclosed herein may comprise a cover body, a first contact element supported by the cover body and having a first flat contact surface, and a second contact element supported by the cover body and having a second flat contact surface inclined relative to the first flat contact surface. The distance between the first contact element and the second contact element may be adjustable.

[0014] The configurations described above allow the positional relationship between the first flat contact surface and the second contact surface to be changed without requiring any component replacement.

[0015] In one or more embodiments, the additional cover may further include a locking component configured to lock the additional cover in a state attached to the main cover.

[0016] The configuration described above prevents the additional cover from being unintentionally removed from the main cover.

[0017] In one or more embodiments, the additional cover may further comprise a metal engagement component configured to engage with the main cover and a rubber sealing component arranged between the engagement component and the cover body.

[0018] The configuration described above prevents dust generated by machining with the tip tool from escaping through a gap between the mating component and the cover body.

[0019] In one or more embodiments, the additional cover can have a metal sliding plate that is movably mounted through the cover body. The first contact component can be fixed to the cover body. The second contact component can be fixed to the sliding plate.

[0020] The configuration described above allows for adjustment of the distance between the first contact component and the second contact component with a simple arrangement.

[0021] In one or more embodiments, the additional cover may further include a fastening component configured to fix the sliding plate to the cover body.

[0022] In the configuration described above, loosening the fastening component allows the sliding plate to move relative to the cover body, and tightening the fastening component allows the sliding plate to be fixed in position relative to the cover body.

[0023] In one or more embodiments, the cover body may further have a side wall arranged radially outside the tip tool when viewed from the axis of rotation, and a reinforcement area arranged radially outside the side wall when viewed from the axis of rotation, and arranged such that it faces the sliding plate.

[0024] The configuration described above prevents the sliding plate from bending significantly, even if the power tool falls and the sliding plate hits the ground.

[0025] In one or more embodiments, the first contact component can be configured in such a way that it is removable and attached to the cover body.

[0026] The configuration described above allows for easy replacement of the first contact component with a new first contact component if the first contact component is worn out due to repeated contact with workpieces.

[0027] In one or more embodiments, the second contact component can be configured in such a way that it is removable and attached to the sliding plate.

[0028] The configuration described above allows for easy replacement of the second contact component with a new second contact component if the second contact component is worn out due to repeated contact with workpieces.

[0029] In one or more embodiments, the first contact component and the second contact component can be identical to each other.

[0030] The configuration described above allows for a reduction in the types of components used for additional cover.

[0031] In one or more embodiments, the power tool may further have a handle configured to be gripped by a user. When viewed from the axis of rotation, the first contact element may be located on one side opposite the handle, and the second contact element may be located on the same side as the handle. The first contact element may be fixed relative to the cover body. The second contact element may be movable relative to the cover body.

[0032] According to the configuration described above, the first contact component, which is located further away from the user, is immovable relative to the cover body when the distance between the first contact component and the second contact component is increased, thus preventing the additional cover from moving away from the user or becoming deformed.

[0033] In one or more embodiments, the second contact component can be movable in a first direction relative to the cover body. The axis of rotation can extend in a second direction perpendicular to the first direction.

[0034] The configuration described above facilitates the machining of a corner of a workpiece by bringing the first flat contact surface and the second flat contact surface into contact with a first surface and a second surface that form the corner of the workpiece.

[0035] In one or more embodiments, the tip tool can be a disc-shaped grinding tool.

[0036] The configuration described above makes it easier to chamfer the corners of workpieces.

[0037] In one or more embodiments, the main cover may have a dust collection port.

[0038] The configuration described above allows dust generated by machining with the tip tool to be collected through the nozzle.

[0039] In one or more embodiments, the additional cover may further comprise a retaining component made of rubber, which is configured to engage with the main cover.

[0040] The configuration described above more efficiently prevents dust generated by machining with the tip tool from escaping through a gap between the auxiliary cover and the main cover.

[0041] In one or more embodiments, the additional cover may further include a ruler unit configured to measure a chamfer size produced by chamfering performed while the first flat contact surface and the second flat contact surface are in contact with a workpiece.

[0042] The configuration described above allows for accurate measurement of the chamfer size during chamfering.

[0043] In one or more embodiments, the ruler unit can comprise a first component having a first contact area configured to come into contact with the first flat contact surface and a second contact area configured to come into contact with the second flat contact surface, and a second component having a reference surface configured to come into contact with the tip tool, wherein the second component is configured to hold the first component movable in one direction along the axis of rotation.

[0044] The configuration described above enables accurate measurement of a chamfer size during chamfering with a simple setup.

[0045] In one or more embodiments, one of the first component and the second component may have a plurality of recesses arranged in the direction along the axis of rotation. The other of the first component and the second component may have a projection configured to engage with one of the plurality of recesses.

[0046] The configuration described above improves the user's tactile sense when moving the first component relative to the second component.

[0047] In one or more embodiments, the ruler unit can be configured to be removablely attached to the cover body.

[0048] The configuration described above prevents the ruler unit from being misplaced or lost when not in use. First embodiment

[0049] As in Fig. As shown in Figure 1, a power tool 2 according to the present embodiment comprises a grinding device 4 and a cover unit 6. The cover unit 6 is attached to the grinding device 4 for use. The grinding device 4 can grind workpieces, such as concrete, concrete blocks, bricks, or stones, by rotating a diamond grinding cup 8 (see Figure 1). Fig. 2), which is a disc-shaped grinding tool. Hereinafter, the longitudinal direction of the grinding device 4 is referred to as a front-back direction, the direction of the axis of rotation of the diamond grinding cup 8 is referred to as an up-down direction, and a direction perpendicular to both the front-back direction and the up-down direction is referred to as a right-left direction.

[0050] The grinding device 4 has a body housing 10, a gearbox housing 12, and a bearing box 14. The body housing 10 has a motor housing area 16, a handle 18 located behind the motor housing area 16, and a battery pack mounting area 20 located behind the handle 18.

[0051] As in Fig. As shown in Figure 2, a motor 22 is housed in the motor housing area 16 of the body housing 10. The motor 22 has a drive shaft 24 extending in the front-to-back direction. The drive shaft 24 is rotatably mounted through the body housing 10 via bearings 26 and 28. The handle 18 is shaped such that a user can grip it with one hand. A push-button lever 30 is located below the handle 18. The push-button lever 30 is configured to be actuated by a finger of the user while the user grips the handle 18. A push-button switch 32 is housed within the handle 18. The push-button switch 32 detects the actuation of the push-button lever 30. As shown in Figure 2, the motor housing 22 has a drive shaft 24 extending in the front-to-back direction. The drive shaft 24 is rotatably mounted through the body housing 10 via bearings 26 and 28. The handle 18 is shaped such that a user can grip it with one hand. A push-button lever 30 is located below the handle 18. The push-button lever 30 is configured to be actuated by a finger of the user while the user grips the handle 18. Fig. As shown in Figure 1, the battery pack mounting area 20 is configured to allow a battery pack 34, containing secondary battery cells such as lithium-ion cells (not shown), to be removably attached to it. A control circuit board (not shown) is housed within the battery pack mounting area 20. The control circuit board supplies power from the battery pack 34 to the motor 22 when the push-button switch 32 is actuated and stops the power supply from the battery pack 34 to the motor 22 when the actuation of the push-button switch 32 is released. The motor 22 rotates the drive shaft 24 (see Figure 1). Fig. 2) using the power supplied by the battery pack 34.

[0052] As in Fig. As shown in Figure 2, the gearbox housing 12 is attached to a front portion of the motor housing portion 16 of the body housing 10. A first bevel gear 36 and a second bevel gear 38 are arranged to mesh with each other and are accommodated within the gearbox housing 12. The first bevel gear 36 is fixed to a front end portion of the drive shaft 24. The second bevel gear 38 is fixed to an upper end portion of a spindle 40 that extends in the top-down direction. Hereinafter, the first bevel gear 36 and the second bevel gear 38 are simply referred to as bevel gears 42. The bevel gears 42 form a speed reduction mechanism that reduces the rotation of the motor 22 and transmits it to the spindle 40. In other words, the bevel gears 42 form a power transmission mechanism. The gearbox housing 12 supports the upper end portion of the spindle 40 via a bearing 44. As shown in Figure 2, the gear housing 12 is mounted to the motor housing 12. Fig. As shown in Figure 1, an auxiliary handle 46 is removable and attached to a side surface of the gearbox housing 12. To use the power tool 2, the user grips the handle 18 of the body housing 10 with one hand and the auxiliary handle 46 with the other hand.

[0053] As in Fig. As shown in Figure 2, the bearing housing 14 is attached to a lower region of the gearbox housing 12. The bearing housing 14 holds the spindle 40 via a bearing 48. The spindle 40 is rotatable relative to the bearing housing 14 about its axis of rotation, which extends in the top-bottom direction. The diamond grinding cup 8 can be attached to a lower end region of the spindle 40 via an inner flange 50 and an outer flange 52. The inner flange 50 is fitted to the spindle 40. The diamond grinding cup 8 is attached to the spindle 40 from below the inner flange 50 and fitted onto the inner flange 50. The outer flange 52 is screwed into the spindle 40 from the lower end of the spindle 40. The diamond grinding cup 8 is held between the inner flange 50 and the outer flange 52.Rotation of the drive shaft 24 of the motor 22 causes the diamond grinding cup 8 and the spindle 40 to rotate about the axis of rotation, thereby grinding a workpiece through the grinding device 4. The spindle 40 can be considered a holding element configured to support the diamond grinding cup 8, which is a precision tool. Hereinafter, the body housing 10, the gear housing 12, and the bearing housing 14 are collectively referred to as a housing 54.

[0054] The cover unit 6 is attached to a cover mounting area 56 of the storage box 14. The cover unit 6 is shaped to cover the circumference of the diamond grinding cup 8 when it is attached to the grinding device 4. The cover unit 6 prevents dust from being distributed into the surrounding area when the diamond grinding cup 8 grinds a workpiece and is used to collect the dust by a dust collector (not shown).

[0055] As in Fig. As shown in Figure 3, the cover unit 6 has a main cover 58 and an additional cover 60. The main cover 58 is removable at the cover mounting area 56 (see Figure 3). Fig. 2) of the grinding tool 4. The auxiliary cover 60 is removable and attached to the main cover 58. The user can use the power tool 2 when the auxiliary cover 60 is removed from the main cover 58, and can also use the power tool 2 when the auxiliary cover 60 is attached to the main cover 58.

[0056] As in Fig. As shown in Figure 4, the main cover 58 has a base 62, a fixed cover 64, a movable cover 66, and a nozzle 68. When the main cover 58 is attached to the grinding tool 4, the base 62 is rotatably mounted about its axis of rotation by the cover mounting area 56 of the grinding tool 4. The axis of rotation of the base 62 is essentially coaxial with the axis of rotation of the spindle 40. The cover mounting area 56 is configured to fix the base 62 at a desired angle of rotation. The fixed cover 64 is fixed to the base 62. The movable cover 66 is rotatably mounted by the base 62 about its axis of rotation. When the main cover 58 is attached to the grinding tool 4, the axis of rotation of the movable cover 66 is essentially coaxial with the axis of rotation of the spindle 40.The fixed cover 64 is shaped to cover part of the upper surface of the diamond grinding cup 8, and the movable cover 66 is shaped to cover the remainder of the upper surface of the diamond grinding cup 8. Brush bristles 64a and 66a are attached to the outer circumference of the fixed cover 64 and the outer circumference of the movable cover 66, respectively, and the brush bristles 64a and 66a cover the side surface of the diamond grinding cup 8. When the main cover 58, which is in . Fig. As shown in Figure 4, the top and side surfaces of the diamond grinding cup 8 are completely covered by the fixed cover 64 and the movable cover 66, to which the grinding device 4 is attached. When the movable cover 66 is rotated relative to the base 62, the top and side surfaces of the diamond grinding cup 8 are partially exposed. The nozzle 68 is integrally formed with the fixed cover 64. The interior of the nozzle 68 is in communicative communication with the interior of the fixed cover 64. The nozzle 68 is configured such that a hose (not shown), extending from a dust collector (not shown), can be detachably attached to it. Dust generated by the diamond grinding cup 8, which grinds a workpiece, is collected in the dust collector by the main cover 58 of the cover unit 6 via the nozzle 68 and the hose.

[0057] The additional cover 60 comprises a cover body 70 made of plastic, an engagement component 72 made of metal, a sealing component 74 made of rubber, a locking component 76 made of plastic, a sliding plate 78 made of metal, a first contact component 80 made of plastic, and a second contact component 82 made of plastic. As shown in Fig. As shown in Figure 5, the cover body 70 has a side wall 70a, which is located outside the brush bristles 64a, 66a of the main cover 58 and surrounds an upper region of the diamond grinding cup 8, a lower front wall 70b, which covers a front region of the lower surface of the diamond grinding cup 8, and a lower rear wall 70c, which covers a rear region of the lower surface of the diamond grinding cup 8. The rear end of the lower front wall 70b extends linearly in the left-right direction between a right and a left region of the side wall 70a. The front end of the lower rear wall 70c extends linearly in the right-left direction between the right and the left region of the side wall 70a. An opening 70d is defined between the lower front wall 70b and the lower rear wall 70c. As shown in Figure 5, the lower front wall 70b is located outside the main cover 58 and surrounds an upper region of the diamond grinding cup 8. Fig. As shown in Figure 4, a plurality of support ribs 70n are located on the inner surface of the side wall 70a, and the support ribs 70n extend in the top-bottom direction and are arranged along a circumferential direction.

[0058] As in Fig. As shown in Figure 6, the engagement component 72 is fixed to a front area of ​​the upper surface of the side wall 70a of the cover body 70 via the sealing component 74 by means of fasteners 84. As shown in Fig. As shown in Figure 3, the engagement component 72 has an engagement claw 72a configured to engage with an engagement groove 66b formed on the upper surface of the main cover 58 (e.g., the upper surface of the movable cover 66). The locking component 76 is fixed to a rear region of the upper surface of the cover body 70 by a fastening element 86. The locking component 76 is rotatably mounted by the cover body 70 about its axis of rotation, which extends in the top-bottom direction. The locking component 76 has an engagement area 76a and an actuation area 76b. As shown in Fig. As shown in Figure 7, a ball guide hole 76c is formed in the actuating area 76b. A ball 88 and a compression spring 90 are attached to the ball guide hole 76c. The ball guide hole 76c has a guide area 76d, which has a slightly larger inner diameter than the outer diameter of the ball 88, and a stop area 76e, which has a slightly smaller inner diameter than the outer diameter of the ball 88. The ball 88 is received in the guide area 76d. The compression spring 90 biases the ball 88 downwards relative to the locking element 76. When the ball 88 is in contact with the stop area 76e, a lower portion of the ball 88 projects downwards from the locking element 76. The lower portion of the ball 88 enters a first recess 70e or a second recess 70f (shown in Figure 7). Fig. 6), which are formed in the upper surface of the side wall 70a of the cover body 70. When the locking component 76 is in a position in which the engagement area 76a is positioned at the front, as in Fig. As shown in Figure 3 (this position may be referred to below as a "locking position"), the ball 88 is received in the actuating area 76b in the first recess 70e. When the locking component 76 is in a position in which the engagement area 76a is positioned at the rear, as shown in Figure 3 (this position may subsequently be referred to as a "locking position"), the ball 88 is received in the actuating area 76b in the first recess 70e. Fig. As shown in Figure 4 (this position may subsequently be referred to as an "unlocked position"), the ball 88 is received in the actuation area 76b in the second recess 70f. As shown in Fig. As shown in Figure 6, a torsion spring 92 is attached to the locking component 76. The torsion spring 92 biases the locking component 76 towards the locked position. When the torsion spring 92 applies a bias force to the locking component 76 and the ball 88 is received in the first recess 70e in the actuating area 76b, the locking component 76 is held in the locked position. Conversely, when the torsion spring 92 applies a bias force to the locking component 76 and the ball 88 is received in the second recess 70f in the actuating area 76b, the locking component 76 is held in the unlocked position.

[0059] To attach the additional cover 60, which is in Fig. As shown in Figure 4, the engagement claw 72a of the auxiliary cover 60 is first brought into engagement with the engagement groove 66b of the main cover 58, and the upper ends of the support ribs 70n on the side wall 70a of the auxiliary cover 60 are brought into contact with the lower surfaces of the fixed cover 64 and the movable cover 66 of the main cover 58. Then the actuating area 76b is moved rearward from the unlocked position to rotate the locking component 76, as shown in Figure 4. Fig. Figure 3 shows that this causes the lower surface of the engagement area 76a to come into contact with the upper surface of the fixed cover 64. Consequently, the engagement area 76a engages with the fixed cover 64, thereby locking the additional cover 60 in the position attached to the main cover 58.

[0060] To remove the additional cover 60, which is located in Fig. As shown in Figure 3, from the main cover 58, the actuating area 76b of the locking component 76 is first moved forward to rotate the locking component 76 out of the locked position, so that the engagement area 76a is unlocked from the fixed cover 64. Then the side wall 70a of the auxiliary cover 60 is separated from the fixed cover 64 and the movable cover 66 of the main cover 58, and the engagement claw 72a of the auxiliary cover 60 is unlocked from the engagement groove 66b of the main cover 58, thereby removing the auxiliary cover 60 from the main cover 58, as shown in Figure 3. Fig. 4 shown.

[0061] As in Fig. As shown in Figure 6, the sliding plate 78 has a flat plate area 78a, a right rail area 78b that curves upward from the right end of plate area 78a, and a left rail area 78c that curves upward from the rear end of plate area 78a. A central elongated hole 78d, a right elongated hole 78e, and a left elongated hole 78f are formed in plate area 78a. The right elongated hole 78e is located to the right of the central elongated hole 78d, and the left elongated hole 78f is located to the left of the central elongated hole 78d. The central elongated hole 78d, the right elongated hole 78e, and the left elongated hole 78f each have their longitudinal direction along the front-back direction. As shown in Figure 6, the sliding plate 78 has a flat plate area 78a, a right rail area 78b that curves upward from the right end of plate area 78a, and a left rail area 78c that curves upward from the rear end of plate area 78a. Fig. As shown in Figure 8, the sliding plate 78 is fixed to the lower surface of the lower rear wall 70c of the cover body 70 by a fastener 94. The fastener 94 extends through the central elongated hole 78d and is screwed into the lower rear wall 70c. When the fastener 94 is loosened, the sliding plate 78 can move in the front-back direction relative to the cover body 70. When the fastener 94 is tightened, after the sliding plate 78 has been moved to a desired position along the front-back direction, the position of the sliding plate 78 relative to the cover body 70 is fixed. As shown in Figure 8, the sliding plate 78 is fixed in position relative to the cover body 70. Fig. As shown in Figure 5, the lower rear wall 70c has a right projection 70g and a left projection 70h. The right projection 70g and the left projection 70h project downwards from the lower surface of the lower rear wall 70c. When the sliding plate 78 is attached to the cover body 70, as shown in Figure 5, the lower rear wall 70c has a right projection 70g and a left projection 70h. Fig. As shown in Figure 8, the right projection 70g is received in the right elongated hole 78e such that it is slidable therein in the front-back direction, and the left projection 70h is received in the left elongated hole 78f such that it is slidable therein in the front-back direction. This causes the sliding plate 78 to move in the front-back direction relative to the cover body 70. Furthermore, the right rail section 78b of the sliding plate 78 engages with a right rail section 701 formed on the right side wall 70a of the cover body 70, so that the right rail section 78b is slidable in the front-back direction. As shown in Figure 8, the right rail section 70g is slidable in the front-back direction. Fig. As shown in Figure 6, the left rail section 78c of the sliding plate 78 engages with a left rail section 70m formed on the left section of the side wall 70a of the cover body 70, so that the left rail section 78c is slidable in the front-back direction. This also results in the movement of the sliding plate 78 in the front-back direction relative to the cover body 70.

[0062] The first contact component 80 has a first flat contact surface 80a, a first marking surface 80b, and a second marking surface 80c. The first contact component 80 is fixed to the lower surface of the lower front wall 70b of the cover body 70 by fasteners 96. When the first contact component 80 is attached to the cover body 70, the first flat contact surface 80a is oriented rearward and downward, and its rear end is located behind the rear end of the lower front wall 70b. In this state, with the first contact component 80 attached to the cover body 70, the first marking surface 80b is oriented to the right and is located to the right of the right side wall 70a.Furthermore, in this state, in which the first contact component 80 is attached to the cover body 70, the second marking surface 80c is oriented to the left and is located to the left of the left area of ​​the side wall 70a.

[0063] The second contact component 82 is identical to the first contact component 80. That is, the second contact component 82 is made of the same material as the first contact component 80 and has the same shape. The second contact component 82 has a second flat contact surface 82a, a first marking surface 82b, and a second marking surface 82c. The second contact component 82 is fixed to the lower surface of the plate area 78a of the sliding plate 78 by fasteners 98. When the second contact component 82 is attached to the sliding plate 78, the second flat contact surface 82a is oriented forward and downward, and the front end of the second flat contact surface 82a is located in front of the front end of the plate area 78a.In this state, in which the second contact component 82 is attached to the sliding plate 78, the first marking surface 82b is oriented to the left and is located to the left of the left area of ​​the side wall 70a. Furthermore, in this state, in which the first contact component 80 is attached to the sliding plate 78, the second marking surface 82c is oriented to the right and is located to the right of the right area of ​​the side wall 70a. As in . Fig. 3 and Fig. As shown in Figure 4, a left scale 70i, corresponding to the first marking surface 82b of the second contact component 82, is formed on the left surface of the left area of ​​the side wall 70a of the cover body 70. Fig. 8 and Fig. As shown in Figure 9, a right scale 70j, corresponding to the second marking surface 82c of the second contact component 82, is formed on the right surface of the right area of ​​the side wall 70a of the cover body 70.

[0064] As in Fig. As shown in Figure 10, a corner between a first surface S1 and a second surface S2 of a workpiece W can be chamfered by the diamond grinding cup 8, with the first flat contact surface 80a of the auxiliary cover 60 in contact with the first surface S1 of the workpiece W and the second flat contact surface 82a of the auxiliary cover 60 in contact with the second surface S2 of the workpiece W. For this machining operation, a chamfer size C is calculated by subtracting a distance B from a distance A, where distance A is a distance along the second surface S2 from a reference point RP on the second contact element 82 to the first surface S1, and distance B is a distance along the second surface S2 from the reference point RP on the second contact element 82 to the lower surface of the diamond grinding cup 8. Distance A varies depending on the position of the second contact element 82 in the front-back direction.The distance B remains constant regardless of the position of the second contact component 82 in the front-back direction.

[0065] The second marking surface 82c indicates the position of a measuring point MP (represented as a combination of the letter A and a triangle) for measuring the distance A using the combination of the position of the reference point RP on the second contact component 82 (represented as a combination of the letter B and a triangle) and the right-hand scale 70j. The user can measure the distance A using the right-hand scale 70j on the cover body 70 and the measuring point MP on the second marking surface 82c, and then calculate the chamfer size C from the distance A and the distance B. As shown in Fig. 3 and Fig. As shown in Figure 4, the first marking surface 82b also has the position of a measuring point MP (represented as a combination of the letter A and a triangle) for measuring the distance A using the combination of the position of the reference point RP on the second contact component 82 (represented as a combination of the letter B and a triangle) and the left scale 70i. The first marking surface 80b of the first contact component 80 has the same markings as those on the first marking surface 82b of the second contact component 82, and the second marking surface 80c of the first contact component 80 has the same markings as those on the second marking surface 82c of the second contact component 82.

[0066] As in Fig. As shown in Figure 5, the cover body 70 has a reinforcement area 70k in its rear region. The reinforcement area 70k projects rearward beyond a rear region of the side wall 70a. As shown in Fig. 8 and Fig. As shown in Figure 9, the reinforcement area 70k is located opposite the upper surface of the sliding plate 78. This prevents a rear area of ​​the sliding plate 78 from being significantly bent upwards, even if the power tool 2 falls and the sliding plate 78 hits the ground. Second embodiment

[0067] As in Fig. As shown in Figure 11, a power tool 102 according to the present disclosure has essentially the same configuration as the power tool 2 according to the first embodiment. The power tool 102 has a cover unit 104 instead of the cover unit 6. As shown in Fig. As shown in Figure 12, the cover unit 104 has an additional cover 106 instead of the additional cover 60.

[0068] As in Fig. As shown in Figure 13, the additional cover 106 has a cover body 108 made of plastic, an engagement component 110 made of metal, a sealing component 112 made of rubber, a locking component 114 made of plastic, a sliding plate 116 made of metal, a first contact component 118 made of plastic, a second contact component 120 made of plastic and a retaining component 122 made of rubber.

[0069] As in Fig. As shown in Figure 14, the cover body 108 has a side wall 108a which extends outside the brush bristles 64a, 66a (see Figure 14). Fig. 13) of the main cover 58 and surrounds a total upper area of ​​the side surface of the diamond grinding cup 8 (see Fig. 19 and Fig. 20), a lower front wall 108b, which covers a front area of ​​the lower surface of the diamond grinding cup 8, and a lower rear wall 108c, which covers a space behind the diamond grinding cup 8 from below. The rear end of the lower front wall 108b extends linearly in the right-left direction between a right and a left area of ​​the side wall 108a. The front end of the lower rear wall 108c is positioned slightly behind the rear end of the diamond grinding cup 8 and extends in the right-left direction between a right and a left area of ​​the side wall 108a. The configuration described above facilitates the installation and removal of the diamond grinding cup 8 when the auxiliary cover 106 is attached to the main cover 58. An opening 108d is defined between the lower front wall 108b and the lower rear wall 108c.A plurality of support ribs 108e are located on the inner surface of the side wall 108a. The support ribs 108e extend in the top-bottom direction and are arranged in a circumferential direction.

[0070] As in Fig. As shown in Figure 13, the engagement component 110 is fixed to a front area of ​​the upper surface of the side wall 108a of the cover body 108 via the sealing component 112 by means of fasteners 124. As shown in Fig. As shown in Figure 12, the engagement component 110 has an engagement claw 110a configured to engage with the engagement groove 66b formed on the upper surface of the main cover 58 (e.g., the upper surface of the movable cover 66). The retaining component 122 is integral and seamlessly formed with the sealing component 112. That is, the retaining component 122 and the sealing component 112 are integral and form a single integrated component. In a modification, the retaining component 122 and the sealing component 112 can be separate components. The retaining component 122 covers a front and an upper area of ​​the engagement component 110, and when the additional cover 106 is attached to the main cover 58, the retaining component 122 overlaps the upper surface of the main cover 58 (e.g., the upper surface of the movable cover 66).A slot 122a is formed in the retaining component 122, and the slot 122a is configured such that it engages with a projection 66c on the upper surface of the movable cover 66.

[0071] The locking component 114 is fixed to a rear area of ​​the upper surface of the cover body 108 by a fastening means 126. The locking component 114 is rotatably mounted by the cover body 108 about its axis of rotation, which extends in the top-bottom direction. The locking component 114 has an engagement area 114a and an actuation area 114b. The locking component 114 has essentially the same configuration as that of the locking component 76 according to the first embodiment and is switchable between a position in which the engagement area 114a is positioned forward (this position can subsequently be referred to as a "locking position") and a position in which the engagement area 114a is positioned rearward (this position can subsequently be referred to as an "unlocked position").

[0072] To attach the additional cover 106, which is in Fig. As shown in Figure 13, the engagement claw 110a of the auxiliary cover 106 is first brought into engagement with the engagement groove 66b of the main cover 58, while the locking component 114 is in the unlocked position. The slot 122a of the auxiliary cover 106 is brought into engagement with the projection 66c of the main cover 58, and the upper ends of the support ribs 108e on the side wall 108a of the auxiliary cover 106 are brought into contact with the lower surfaces of the fixed cover 64 and the movable cover 66 of the main cover 58. Then the locking component 114 is rotated from the unlocked position to the locked position. Consequently, the engagement area 114a engages with the fixed cover 64, thereby locking the auxiliary cover 106 in the state attached to the main cover 58.

[0073] To remove the additional cover 106, the Fig. As shown in Figure 12, the locking component 114 of the main cover 58 is first rotated from the locked position to the unlocked position such that the engagement area 114a is unlocked from the fixed cover 64. Then, the side wall 108a of the auxiliary cover 106 is separated from the fixed cover 64 and the movable cover 66 of the main cover 58, the slot 122a of the auxiliary cover 106 is unlocked from the projection 66c of the main cover 58, and an engagement claw 110a of the auxiliary cover 106 is unlocked from the engagement groove 66b of the main cover 58, thereby removing the auxiliary cover 106 from the main cover 58.

[0074] As in Fig. As shown in Figure 15, the sliding plate 116 has a flat plate area 116a, a right rail area 116b that curves upward from the right end of plate area 116a, and a left rail area 116c that curves upward from the left end of plate area 116a. A first central elongated hole 116d, a second central elongated hole 116e, a right elongated hole 116f, and a left elongated hole 116g are formed in plate area 116a. The first central elongated hole 116d and the second central elongated hole 116e are arranged side by side in the right-left direction. The right oblong hole 116f is located to the right of the second middle oblong hole 116e, and the left oblong hole 116g is located to the left of the first middle oblong hole 116d.The first middle oblong hole 116d, the second middle oblong hole 116e, the right oblong hole 116f and the left oblong hole 116g each have their longitudinal direction along the front-back direction.

[0075] The sliding plate 116 is fixed to the lower surface of the lower rear wall 108c of the cover body 108 by a right fastener 128 and a left fastener 130. The right fastener 128 extends through the right elongated hole 116f and is attached to the lower rear wall 108c. The left fastener 130 extends through the left elongated hole 116g and is attached to the lower rear wall 108c. When the right fastener 128 and the left fastener 130 are loosened, the sliding plate 116 can move forward and backward relative to the cover body 108. When the right fastener 128 and the left fastener 130 are tightened after the sliding plate 116 has been moved to a desired position along the front-back direction, the position of the sliding plate 116 relative to the cover body 108 is fixed.

[0076] As in Fig. As shown in Figure 14, the lower rear wall 108c has a first projection 108f and a second projection 108g arranged side by side in the left-right direction. The first projection 108f and the second projection 108g each project downwards from the lower surface of the lower rear wall 108c and have their longitudinal direction along the front-back direction. When the sliding plate 116 is attached to the cover body 108, as shown in Figure 14, the first projection 108f and the second projection 108g each project downwards from the lower surface of the lower rear wall 108c and have their longitudinal direction along the front-back direction. Fig. As shown in Figure 15, the first projection 108f is received in the first central elongated hole 116d such that it is slideable therein in the front-back direction, and the second projection 108g is received in the second central elongated hole 116e such that it is slideable therein in the front-back direction. This causes the sliding plate 116 to move in the front-back direction relative to the cover body 108. Furthermore, the right rail section 116b of the sliding plate 116 engages with a right rail section 108h formed on the right side wall 108a of the cover body 108, so that the right rail section 116b is slideable in the front-back direction. As shown in Fig. As shown in Figure 12, the left rail section 116c of the sliding plate 116 engages with a left rail section 108i, which is formed on the left section of the side wall 108a of the cover body 108, so that the left rail section 116c is slidable in the front-back direction. This also results in the movement of the sliding plate 116 in the front-back direction relative to the cover body 108.

[0077] As in Fig. As shown in Figure 15, the first contact component 118 has a first flat contact surface 118a, a first side surface 118b, and a second side surface 118c. The first contact component 118 is fixed to the lower surface of the lower front wall 108b of the cover body 108 by fasteners 132. When the first contact component 118 is attached to the cover body 108, the first flat contact surface 118a is oriented rearward and downward, and the rear end of the first flat contact surface 118a is located behind the rear end of the lower front wall 108b. When the first contact component 118 is attached to the cover body 108, the first side surface 118b is oriented to the right, and the second side surface 118c is oriented to the left.Unlike the first marking surface 80b and the second marking surface 80c of the first contact component 118 according to the first embodiment, the first side surface 118b and the second side surface 118c of the first contact component 118 according to the present embodiment have no markings on them.

[0078] The second contact component 120 is identical to the first contact component 118. That is, the second contact component 120 is made of the same material as the first contact component 118 and has the same shape. The second contact component 120 has a second flat contact surface 120a, a first side surface 120b, and a second side surface 120c. The second contact component 120 is fixed to the lower surface of the plate area 116a of the sliding plate 116 by fasteners 134. When the second contact component 120 is attached to the sliding plate 116, the second flat contact surface 120a is oriented forward and downward, and the front end of the second flat contact surface 120a is located in front of the front end of the plate area 116a.When the second contact component 120 is attached to the sliding plate 116, the first side surface 120b is oriented to the left and the second side surface 120c is oriented to the right. Unlike the first marking surface 82b and the second marking surface 82c of the second contact component 82 according to the first embodiment, the first side surface 120b and the second side surface 120c of the second contact component 120 according to the present embodiment have no markings on them. Furthermore, unlike the cover body 70 according to the first embodiment, the cover body 108 according to the present embodiment does not have the left scale 70i or the right scale 70j.

[0079] The cover body 108 has a reinforcement area 108j in its rear region. The reinforcement area 108j projects rearward beyond a rear region of the side wall 108a. The reinforcement area 108j is opposite the upper surface of the sliding plate 116. This prevents a rear region of the sliding plate 116 from bending significantly upwards, even if the power tool 102 falls and the sliding plate 116 strikes the ground.

[0080] As in Fig. As shown in Figure 12, the additional cover 106 has a ruler unit 136. The ruler unit 136 is removably attached to a ruler unit holding area 108k, which is formed on the upper surface of the reinforcement area 108j of the cover body 108.

[0081] As in Fig. As shown in Figure 16, the ruler unit 136 comprises a scale plate 138 and a movable plate 140. In the following description of the ruler unit 136, the longitudinal direction of the scale plate 138 is along the top-bottom direction, and the longitudinal direction of the movable plate 140 is along the right-left direction. The scale plate 138 has a rectangular, flat plate shape with a longitudinal direction along the top-bottom direction and a transverse direction along the left-right direction. The scale plate 138 has on its surface a first scale 138a for inch markings and a second scale 138b for millimeter markings. An elongated hole 138c is formed in a central region of the scale plate 138. The elongated hole 138c penetrates the scale plate 138 from the front surface to the rear surface and extends in the longitudinal direction of the scale plate 138. As in Fig. As shown in Figure 17, the majority of the recessed grooves 138d are formed in the rear surface of the scale plate 138, and the recessed grooves 138d are arranged in the longitudinal direction of the scale plate 138. Each of the recessed grooves 138d extends in the transverse direction of the scale plate 138. The scale plate 138 has a reference surface 138e at its lower end.

[0082] As in Fig. As shown in Figure 18, the movable plate 140 has a base region 140a having a trapezoidal flat plate shape, a first contact plate 140b located on a lower right inclined region of the base region 140a, a second contact plate 140c located on a lower left inclined region of the base region 140a, engagement claws 140d projecting forward from the front surface of the base region 140a, bearing regions 140e elastically deformable relative to the base region 140a, and upright ribs 140f projecting forward from the front surfaces of the bearing regions 140e and extending longitudinally along the base region 140a. As shown in Fig. As shown in Figure 16, the movable plate 140 is attached to the scale plate 138 by inserting the engagement claws 140d into the elongated hole 138d of the scale plate 138 from the rear. The movable plate 140 is movable in the up-down direction relative to the scale plate 138. As shown in Fig. 17 shows that when the movable plate 140 is attached to the scale plate 138, each of the upright ribs 140f (see Fig. 18) the movable plate 140 engages with one of the recessed grooves 138d of the scale plate 138, thereby fixing the position of the movable plate 140 relative to the scale plate 138. When the user moves the movable plate 140 in the up-down direction relative to the scale plate 138, the upright ribs 140f of the movable plate 140 repeatedly emerge from the recessed grooves 138d of the scale plate 138 and enter other recessed grooves 138d, providing a tactile click sensation for the user. As in Fig. As shown in Figure 16, the movable plate 140 has on its front surface a first reference mark 140g, which corresponds to the first scale 138a of the scale plate 138, and a second reference mark 140h, which corresponds to the second scale 138b of the scale plate 138.

[0083] In the power tool 102 according to the present embodiment, a chamfer size C can be measured during chamfering, which is performed when the first flat contact surface 118a and the second flat contact surface 120a of the additional cover 106 are in contact with a workpiece W, using the ruler unit 136. For this measurement, the reference surface 138e of the scale plate 138 of the ruler unit 136 is first brought into contact with the lower surface of the diamond grinding cup 8 from below, as shown in Fig. 19 and Fig. 20. Then the movable plate 140 is moved relative to the scale plate 138 until the first contact plate 140b touches the first flat contact surface 118a of the additional cover 106 and the second contact plate 140c touches the second flat contact surface 120a of the additional cover 106. By reading the position of the first reference mark 140g relative to the first scale 138a or the position of the second reference mark 140h relative to the second scale 138b after the movable plate 140 has been moved, the chamfer size C can be measured. In the example shown in Fig. As shown in Figure 19, the chamfer size C when chamfering with the power tool 102 is 0.5 inches (12.7 mm). In the example shown in Fig. Figure 20 shows the chamfer size C when chamfering with the power tool 102 1.5 inch (38.1 mm).

[0084] With the ruler unit 136 according to the present embodiment, the chamfer size C is measured during chamfering with the reference surface 138e in contact with the lower surface of the diamond grinding cup 8. This enables an accurate measurement of the chamfer size C during chamfering, even if the position of the lower surface of the diamond grinding cup 8 changes relative to the cover unit 104 due to wear. Modifications

[0085] The cover units 6, 104 can be used with other types of power tools, such as circular saws. In this case, tip tools that differ from the diamond grinding cup 8 can be used with the power tools.

[0086] The ruler unit 136 can comprise a single component. In this case, the single component can have multiple combinations of reference surfaces for contact with the diamond grinding cup 8, first contact plates for contact with the first flat contact surface 118a, and second contact plates for contact with the second flat contact surface 120a for measuring the chamfer size C during chamfering. Alternatively, the ruler unit 136 can have multiple components configured for separate use. In this case, each of the multiple components can have a combination of a reference surface for contact with the diamond grinding cup 8, a first contact plate for contact with the first flat contact surface 118a, and a second contact plate for contact with the second flat contact surface 120a for measuring the chamfer size C during chamfering. Features of the embodiments

[0087] As described above, in one or more embodiments, the power tool 2, 102 comprises the motor 22, the bevel gear 42 (an example of a power transmission mechanism) coupled to the motor 22, the housing 54 that accommodates the motor 22 and the bevel gear 42, the spindle 40 (an example of a holding element) coupled to the bevel gear 42, the diamond grinding cup 8 (an example of a point tool) held by the spindle 40 and rotatable about its axis of rotation, and the cover unit 6, 104. The cover unit 6, 104 comprises the main cover 58, which is attached to the housing 54 and covers at least part of the diamond grinding cup 8, and the auxiliary cover 60, 106, which is removably attached to the main cover 58.The additional cover 60, 106 comprises the cover body 70, 108, the first contact component 80, 118, which is supported by the cover body 70, 108 and has the first flat contact surface 80a, 118a, and the second contact component 82, 120, which is supported by the cover body 70, 108 and has the second flat contact surface 82a, 120a, which is inclined relative to the first flat contact surface 80a, 118a. The distance between the first contact component 80, 118 and the second contact component 82, 120 is adjustable.

[0088] The configuration described above allows a change in the positional relationship between the first flat contact surface 80a, 118a and the second flat contact surface 82a, 120a without requiring a component exchange.

[0089] In one or more embodiments, the additional cover 60, 106 further comprises the locking component 76, 114, which is configured to lock the additional cover 60, 106 in a state attached to the main cover 58.

[0090] The configuration described above prevents the additional cover 60, 106 from being unintentionally removed from the main cover 58.

[0091] In one or more embodiments, the additional cover 60, 106 further comprises the metal engagement component 72, 110, which is configured to engage with the main cover 58, and the rubber sealing component 74, 112, which is arranged between the engagement component 72, 110 and the cover body 70, 108.

[0092] The configuration described above prevents dust generated by machining with the diamond grinding cup 8 from escaping through a gap between the engagement component 72, 110 and the cover body 70, 108.

[0093] In one or more embodiments, the additional cover 60, 106 further comprises the sliding plate 78, 116 made of metal, which is movably mounted by the cover body 70, 108. The first contact component 80, 118 is fixed to the cover body 70, 108. The second contact component 82, 120 is fixed to the sliding plate 78, 116.

[0094] The configuration described above allows the distance between the first contact component 80, 118 and the second contact component 82, 120 to be adjusted using a simple arrangement.

[0095] In one or more embodiments, the additional cover 60, 106 further comprises the fastening component 94, the right and left fastening components 128, 130 (examples of a fastening component) which are configured to fix the sliding plate 78, 116 to the cover body 70, 108.

[0096] In the configuration described above, loosening the fastening component 94, the right and left fastening components 128, 130 allows the sliding plate 78, 116 to be movable relative to the cover body 70, 108, and tightening the fastening component 94, the right and left fastening components 128, 130 allows the sliding plate 78, 116 to be fixed in position relative to the cover body 70, 108.

[0097] In one or more embodiments, the cover body 70, 108 further comprises the side wall 70a, 108a, which is arranged radially outwards from the diamond grinding cup 8 when viewed from the axis of rotation of the diamond grinding cup 8, and the reinforcement area 70k, 108j, which is arranged radially outside the side wall 70a, 108a when viewed from the axis of rotation of the diamond grinding cup 8, and opposite the sliding plate 78, 116.

[0098] The configuration described above prevents the sliding plate 78, 116 from bending significantly, even if the power tool 2, 102 falls and the sliding plate 78, 116 hits the ground.

[0099] In one or more embodiments, the first contact component 80, 118 is configured to be removablely attached to the cover body 70, 108.

[0100] The configuration described above allows for easy replacement of the first contact component 80, 118 with a new first contact component 80, 118 if the first contact component 80, 118 is worn out due to repeated contact with workpieces W.

[0101] In one or more embodiments, the second contact component 82, 120 is configured to be removablely attached to the sliding plate 78, 116.

[0102] The configuration described above allows for easy replacement of the second contact component 82, 120 with a second new contact component 82, 120 if the second contact component 82, 120 is worn out due to repeated contact with workpieces W.

[0103] In one or more embodiments, the first contact component 80 and the second contact component 82 are identical to each other, and the first contact component 118 and the second contact component 120 are identical to each other.

[0104] The configuration described above allows for a reduction in the types of components used for the additional cover 60, 106.

[0105] In one or more embodiments, the power tool 2, 102 may further comprise the handle 18, which is configured to be gripped by a user. When viewed from the axis of rotation of the diamond grinding cup 8, the first contact element 80, 118 is arranged on the opposite side to the handle 18, and the second contact element 82, 120 is arranged on the same side as the handle 18. The first contact element 80, 118 is fixed relative to the cover body 70, 108. The second contact element 82, 120 is movable relative to the cover body 70, 108.

[0106] According to the configuration described above, the first contact component 80, 118, which is located further away from the user, is immovable relative to the cover body 70, 108 when the distance between the first contact component 80, 118 and the second contact component 82, 120 is increased, thus preventing the additional cover 60, 106 from moving away from the user or becoming deformed.

[0107] In one or more embodiments, the second contact component 82, 120 is movable in the front-back direction (an example of a first direction) relative to the cover body 70, 108. The axis of rotation of the diamond grinding cup 8 extends in the top-bottom direction (an example of a second direction), which is perpendicular to the front-back direction.

[0108] The configuration described above facilitates the machining of a corner of a workpiece W by having the first flat contact surface 80a, 118a and the second flat contact surface 82a, 120a each in contact with the first surface S1 and the second surface S2, which form the corner of the workpiece W.

[0109] In one or more embodiments, the diamond grinding cup 8 is a disc-shaped grinding tool.

[0110] The configuration described above facilitates the chamfering of corners of workpieces W.

[0111] In one or more embodiments, the main cover 58 has the dust collection nozzle 68.

[0112] The configuration described above allows dust generated by machining with the diamond grinding cup 8 to be collected via the nozzle 68.

[0113] In one or more embodiments, the additional cover 106 further comprises the retaining component 122 made of rubber, which is configured to engage with the main cover 58.

[0114] The configuration described above more efficiently prevents dust generated by machining with the diamond grinding cup 8 from escaping through a gap between the auxiliary cover 106 and the main cover 58.

[0115] In one or more embodiments, the additional cover 106 further comprises the ruler unit 136, which is configured to measure the chamfer size C produced by chamfering performed while the first flat contact surface 118a and the second flat contact surface 120a are in contact with a workpiece W.

[0116] The configuration described above allows for accurate measurement of the chamfer size C during chamfering.

[0117] In one or more embodiments, the ruler unit 136 comprises the movable plate 140 (an example of a first component) comprising the first contact plate 140b (an example of a first contact area) configured to touch the first flat contact surface 118a, and the second contact plate 140c (an example of a second contact area) configured to touch the second flat contact surface 120a, and the scale plate 138 (an example of a second component) comprising the reference surface 138e configured to touch the diamond grinding cup 8, wherein the scale plate 138 is configured to hold the movable plate 140 movable in the up-down direction (an example of a direction along the axis of rotation).

[0118] The configuration described above enables accurate measurement of the chamfer size C during chamfering with a simple setup.

[0119] In one or more embodiments, the scale plate 138 has a plurality of recessed slots 138d (an example of recesses) arranged in the top-bottom direction. The movable plate 140 has upright ribs 140f (an example of a projection), each configured to engage with one of the plurality of recessed slots 138d.

[0120] The configuration described above improves the user's tactile sense when the user moves the movable plate 140 relative to the scale plate 138.

[0121] In one or more embodiments, the ruler unit 136 is configured such that it is removablely attached to the cover body 108.

[0122] The configuration described above prevents the loss of ruler unit 136 when ruler unit 136 is not in use. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 2022 / 0 203 499

[0002]

Claims

[1] Power tool (2, 102), with a motor (22), a power transmission mechanism (42) coupled to the motor (22), a housing (54) that accommodates the motor (22) and the power transmission mechanism (42), a holding part (40) which is coupled to the power transmission mechanism (42), a tip tool (8) which is held by the holding part (40) and is rotatable about a pivot axis, and a cover unit (6, 104), where the cover unit (6, 104) a main cover (58) which is attached to the housing (54) and covers at least part of the tip tool (8), and has an additional cover (60, 106) which is removable and attached to the main cover (58), the additional cover (60, 106) a cover body (70, 108), a first contact component (80, 118) which is supported by the cover body (70, 108) and has a first flat contact surface (80a, 118a), and a second contact component (82, 120) which is supported by the cover body (70, 108) and has a second flat contact surface (82a, 120a) which is inclined relative to the first flat contact surface (80a, 118a), and a distance between the first contact component (80, 118) and the second contact component (82, 120) is adjustable. [2] Power tool (2, 102) according to claim 1, wherein the additional cover (60, 106) further comprises a locking component (76, 114) configured to lock the additional cover (60, 106) in a state attached to the main cover (58). [3] Power tool (2, 102) according to claim 1 or 2, wherein the additional cover (60, 106) further an engagement component (72, 110) made of metal, configured for engagement with the main cover (58), and a sealing component (74, 112) made of rubber, which is arranged between the engagement component (72, 110) and the cover body (70, 108). [4] Power tool (2, 102) according to one of claims 1 to 3, wherein the additional cover (60, 106) further comprises a sliding plate (78, 116) made of metal, which is movably mounted by the cover body (70, 108), the first contact component (80, 118) is fixed to the cover body (70, 108), and the second contact component (82, 120) is fixed to the sliding plate (78, 116). [5] Power tool (2, 102) according to claim 4, wherein the additional cover (60, 106) further comprises a fastening component (94, 128, 130) configured to fix the sliding plate (78, 116) to the cover body (70, 108). [6] Power tool (2, 102) according to claim 4 or 5, wherein the cover body (70, 108) further a side wall (70a, 108a) which is arranged radially outside the tip tool (8) when viewed from the axis of rotation, and has a reinforcement area (70k, 108j) which is arranged radially outside the side wall (70a, 108a) when viewed from the axis of rotation, and is arranged opposite the sliding plate (78, 116). [7] Power tool (2, 102) according to one of claims 4 to 6, wherein the first contact component (80, 118) is configured to be removablely attached to the cover body (70, 108). [8] Power tool (2, 102) according to one of claims 4 to 7, wherein the second contact component (82, 120) is configured to be removablely attached to the sliding plate (78, 116). [9] Power tool (2, 102) according to one of claims 1 to 8, wherein the first contact component (80, 118) and the second contact component (82, 120) are identical to each other. [10] Power tool (2, 102) according to any one of claims 1 to 9, further comprising a handle (18) configured to be gripped by a user, in which, when viewed from the axis of rotation, the first contact component (80, 118) is arranged on one side opposite to the handle (18) and the second contact component (82, 120) is arranged on the same side as the handle (18), the first contact component (80, 118) is immovable relative to the cover body (70, 108), and the second contact component (82, 120) is movable relative to the cover body (70, 108). [11] Power tool (2, 102) according to claim 10, wherein the second contact component (82, 120) is movable in a first direction relative to the cover body (70, 108), and the axis of rotation extends in a second direction perpendicular to the first direction. [12] Power tool (2, 102) according to claim 11, wherein the tip tool (8) is a disc-shaped grinding tool. [13] Power tool (2, 102) according to one of claims 1 to 12, wherein the main cover (58) has a dust collection nozzle (68). [14] Power tool (102) according to any one of claims 1 to 13, wherein the additional cover (106) further comprises a retaining component made of rubber which is configured to engage with the main cover (58). [15] Power tool (102) according to any one of claims 1 to 14, wherein the additional cover (106) further comprises a ruler unit (136) configured to measure a chamfer size (C) produced by chamfering performed while the first flat contact surface (118a) and the second flat contact surface (120a) are in contact with a workpiece (W). [16] Power tool (102) according to claim 15, wherein the ruler unit (136) a first component (140) having a first contact area (140b) configured to be in contact with the first flat contact surface (118a) and a second contact area (140c) configured to be in contact with the second flat contact surface (120a), and a second component (138) having a reference surface (138e) configured to be in contact with the tip tool (8), wherein the second component (138) is configured to hold the first component (140) movable in one direction along the axis of rotation. [17] Power tool (102) according to claim 16, wherein one of the first component (140) and the second component (138) has a plurality of recesses (138d) arranged in the direction along the axis of rotation, and the other of the first component (140) and the second component (138) has a projection (140f) configured to engage with one of the plurality of recesses (138d). [18] Power tool (102) according to one of claims 15 to 17, wherein the ruler unit (136) is configured to be removablely attached to the cover body (70, 108). [19] Cover unit (6, 104) for a power tool (2, 102), with a main cover (58), and an additional cover (60, 106) which is removablely attached to the main cover (58), where the additional cover (60, 106) a cover body (70, 108), a first contact component (80, 118) which is supported by the cover body (70, 108) and has a first flat contact surface (80a, 118a), and a second contact component (82, 120) which is supported by the cover body (70, 108) and has a second flat contact surface (82a, 120a) which is inclined relative to the first flat contact surface (80a, 118a), and a distance between the first contact component (80, 118) and the second contact component (82, 120) is adjustable. [20] Additional cover (60, 106) of a cover unit (6, 104) for a power tool (2, 102), with a cover body (70, 108), a first contact component (80, 118) which is supported by the cover body (70, 108) and has a first flat contact surface (80a, 118a), and a second contact component (82, 120) which is supported by the cover body (70, 108) and has a second flat contact surface (82a, 120a) which is inclined relative to the first flat contact surface (80a, 118a), and where the distance between the first contact component (80, 118) and the second contact component (82, 120) is adjustable.