JP2019141961A - Electric tool - Google Patents

Abstract

To provide a technology that can prevent a user from removing a cover with a simple structure.SOLUTION: The specification discloses an electric tool. The electric tool includes: a motor; a speed reduction mechanism connected to the motor; a housing which houses the motor and the speed reduction mechanism; a tip tool holding part connected to the speed reduction mechanism; a cover covering at least a part of the tip tool holding part; and a stopper member attached to the cover. The cover has an engagement rib. The housing has an engagement wall which engages with the engagement rib. The engagement wall has a cutout through which the engagement rib passes when the cover is attached to the housing. The stopper member has an engagement part which engages with the engagement wall.SELECTED DRAWING: Figure 9

Description

  The technology disclosed in this specification relates to a power tool.

  Patent Document 1 discloses a motor, a speed reduction mechanism connected to the motor, a housing that houses the motor and the speed reduction mechanism, a tip tool holding portion connected to the speed reduction mechanism, and a tip tool holding portion. A power tool including a cover that covers at least a portion is disclosed. The cover has an engagement rib. The housing has an engagement wall that engages with the engagement rib. The engagement wall has a notch through which the engagement rib passes when the cover is attached to the housing.

JP 2000-135687 A

  For the safety of the user, the cover needs to be securely attached when the power tool is used. However, if the user can freely remove the cover, the power tool may be used with the cover removed. A technique that can prevent the user from removing the cover with a simple configuration is expected.

  The present specification discloses a power tool. The electric tool includes a motor, a speed reduction mechanism connected to the motor, a housing that houses the motor and the speed reduction mechanism, a tip tool holding portion connected to the speed reduction mechanism, and at least the tip tool holding portion. A cover for covering a part and a stopper member attached to the cover are provided. The cover has an engagement rib. The housing has an engagement wall that engages with the engagement rib. The engagement wall has a notch through which the engagement rib passes when the cover is attached to the housing. The stopper member has an engaging portion that engages with the engaging wall.

  According to the above configuration, even when the user tries to remove the cover from the housing and aligns the engaging rib with the engaging wall, the stopper member is engaged with the engaging wall, so that the cover is not removed. Is done. A simple configuration can prevent the user from removing the cover.

  The present specification also discloses another power tool. The power tool covers a motor, a housing that houses the motor, a tip tool holding portion that is driven by the motor, and at least a part of the tip tool holding portion, and has a rotational axis around the housing. A cover that is rotatable, a first engagement portion and a second engagement portion provided on the cover, and a housing, the first engagement portion and the An engaged portion engageable with the second engaging portion. The engaged portion is engaged with at least one of the first engaging portion and the second engaging portion regardless of a rotation angle of the cover with respect to the housing, and the cover is in contact with the housing. , Cannot move in the direction along the rotation axis.

  According to the above configuration, regardless of the rotation angle of the cover with respect to the housing, the engaged portion is engaged with at least one of the first engaging portion and the second engaging portion, and the cover is In contrast, it is prohibited to move in the direction along the rotation axis. A simple configuration can prevent the user from removing the cover.

It is a longitudinal cross-sectional view of the grinder 2 of Example 1. FIG. It is the perspective view which looked at the front part of the grinder 2 of Example 1 from the front right lower side. It is a perspective view of the wheel cover 12 of the grinder 2 of Example 1. FIG. It is a perspective view of the stopper member 76 of the grinder 2 of Example 1. FIG. It is the perspective view which looked at the structure of the bearing box 10 of the grinder 2 of Example 1 from the lower left. It is the perspective view which looked at the state before attaching the wheel cover 12 to the bearing box 10 about the front part of the grinder 2 of Example 1 from back left lower direction. It is the perspective view which looked at the state after attaching the wheel cover 12 to the bearing box 10 about the front part of the grinder 2 of Example 1 from back left lower direction. It is the perspective view which looked at the state before attaching the stopper member 76 to the wheel cover 12 about the front part of the grinder 2 of Example 1 from the front right upper side. It is the perspective view which looked at the state after attaching the stopper member 76 to the wheel cover 12 about the front part of the grinder 2 of Example 1 from the front right upper side. It is a top view of the structure which changed arrangement | positioning of the stop ring 74 and the stopper member 76 about the wheel cover 12 of the grinder 2 of Example 1. FIG. It is a perspective view of the wheel cover 92 of the grinder 2 of Example 1. FIG. It is a perspective view of the stopper member 94 of the grinder 2 of Example 1. FIG. It is a perspective view of the stopper member 96 of the grinder 2 of Example 1. FIG. It is the perspective view which looked at the front part of the grinder 102 of Example 2 from front right upper direction. It is a perspective view of the wheel cover 104 of the grinder 102 of Example 2. FIG. It is a top view of the wheel cover 104 of the grinder 102 of Example 2. It is the perspective sectional view which looked at the structure of the bearing box 10 and the locking mechanism 106 of the grinder 102 of Example 2 from back left lower direction. It is a perspective view of the lock plate 114 of the grinder 102 of Example 2. FIG. It is sectional drawing of the attachment location of the engagement screw 126 of the grinder 102 of Example 2. FIG. It is the perspective view which looked at the state before attaching the wheel cover 104 to the bearing box 10 about the front part of the grinder 102 of Example 2 from back lower right. It is the perspective view which looked at the state after attaching the wheel cover 104 to the bearing box 10 about the front part of the grinder 102 of Example 2 from the back lower right side. It is the perspective view which looked at the state before attaching the engaging screw 126 to the wheel cover 104 about the front part of the grinder 102 of Example 2 from the front right upper side.

  In one or more embodiments, the power tool includes a motor, a speed reduction mechanism connected to the motor, a housing that houses the motor and the speed reduction mechanism, and a tip tool holding portion connected to the speed reduction mechanism. And a cover that covers at least a part of the tip tool holding portion, and a stopper member attached to the cover. The cover may have an engagement rib. The housing may have an engagement wall that engages with the engagement rib. The engagement wall may have a notch through which the engagement rib passes when the cover is attached to the housing. The stopper member may have an engaging portion that engages with the engaging wall.

  According to the above configuration, even when the user tries to remove the cover from the housing and aligns the engaging rib with the engaging wall, the stopper member is engaged with the engaging wall, so that the cover is not removed. Is done. A simple configuration can prevent the user from removing the cover.

  In one or more embodiments, the cover may include a band having an opening. The engagement rib may be formed on an inner peripheral surface of the band portion. The stopper member may be attached to the cover so as to be disposed in the opening.

  In the above configuration, before attaching the stopper member to the cover, the engaging rib and the notch are aligned and the cover is attached to the housing, and then the engaging portion of the stopper member is attached to the housing using the opening of the cover. The stopper member can be attached to the cover while being engaged with the engagement wall. Since it is not necessary to form a through hole or notch in the cover for engaging the engaging portion of the stopper member with the engaging wall of the housing, the strength of the cover is prevented from being reduced by forming the through hole or the notch. be able to.

  In one or more embodiments, the cover may include an adjustment screw capable of adjusting a distance between the openings, and the stopper member may be a sheet metal member having a through hole. The adjustment screw may pass through the through hole and hold the stopper member.

  According to said structure, the removal of a cover by a user can be prevented using the stopper member of a very simple structure.

  In one or more embodiments, the cover may further comprise a rubber stop ring attached to the adjustment screw.

  According to said structure, it can prevent that an adjustment screw and a stopper member fall off from a cover.

  In one or more embodiments, the stopper member may include a first flat plate portion having the through hole and a second flat plate portion bent from the first flat plate portion.

  According to said structure, it can prevent that a stopper member rotates with respect to an adjustment screw because the 2nd flat plate part of a stopper member engages with a band part. It can prevent that an engaging part remove | deviates from an engaging wall by rotation of a stopper member.

  In one or more embodiments, the power tool covers a motor, a housing that houses the motor, a tip tool holder that is driven by the motor, and at least a portion of the tip tool holder. A cover rotatable about a rotation axis with respect to the housing; a first engagement portion and a second engagement portion provided on the cover; and a direction provided along the rotation axis provided in the housing. And an engaged portion that can be engaged with the first engaging portion and the second engaging portion. The engaged portion may engage with at least one of the first engaging portion and the second engaging portion regardless of a rotation angle of the cover with respect to the housing, and the cover is in contact with the housing. Thus, it may not be movable in the direction along the rotation axis.

  According to the above configuration, regardless of the rotation angle of the cover with respect to the housing, the engaged portion is engaged with at least one of the first engaging portion and the second engaging portion, and the cover is In contrast, it is prohibited to move in the direction along the rotation axis. A simple configuration can prevent the user from removing the cover.

(Example 1)
As shown in FIG. 1, the grinder 2 according to the first embodiment includes a motor housing 4, a rear housing 6, a gear housing 8, a bearing box 10, and a wheel cover 12.

  A motor 14 is accommodated in the motor housing 4. The motor 14 has an output shaft 16 that extends in the front-rear direction. The output shaft 16 is rotatably supported by the motor housing 4 via bearings 18 and 20.

  The rear housing 6 is attached to the rear of the motor housing 4. A power circuit 22 is accommodated in the rear housing 6. Power is supplied to the power supply circuit 22 from an external power supply via a power cord 24. The power supply circuit 22 supplies power to the motor 14 when the user turns on the switch 26 (see FIG. 5 and the like), and stops supplying power to the motor 14 when the user operates the switch 26 off. The motor 14 rotates the output shaft 16 with the electric power supplied from the power supply circuit 22.

  The gear housing 8 is attached in front of the motor housing 4. A first bevel gear 28 and a second bevel gear 30 that are arranged so as to mesh with each other are housed inside the gear housing 8. The first bevel gear 28 is fixed to the front end portion of the output shaft 16. The second bevel gear 30 is fixed to the upper end portion of the spindle 32 extending in the vertical direction. Hereinafter, the first bevel gear 28 and the second bevel gear 30 are collectively referred to simply as a bevel gear 34. The bevel gear 34 is a reduction mechanism that reduces the rotation of the motor 14 and transmits it to the spindle 32. The gear housing 8 holds the upper end of the spindle 32 via a bearing 36. As shown in FIG. 2, a shaft lock 38 is provided on the upper surface of the gear housing 8. When the user pushes the shaft lock 38 downward, the rotation of the second bevel gear 30 is prohibited and the rotation of the spindle 32 is prohibited.

  The bearing box 10 is attached below the gear housing 8. The bearing box 10 holds the spindle 32 via bearings 40 and 42. The spindle 32 is rotatable with respect to the bearing box 10 with respect to a rotation axis along the vertical direction. A grinding wheel GW can be attached to the lower end portion of the spindle 32 via an inner flange IF and an outer flange OF. In the grinder 2, when the motor 14 rotates, the grinding wheel GW rotates around the rotation axis together with the spindle 32, so that the workpiece can be ground. The spindle 32 can also be referred to as a tip tool holding portion that holds a grinding wheel GW that is a tip tool. In the following description, the motor housing 4, the rear housing 6, the gear housing 8 and the bearing box 10 are collectively referred to simply as a housing 44.

  A wheel cover 12 is attached to the bearing box 10. The wheel cover 12 is formed in a shape that covers at least a part of the grinding wheel GW. In the present embodiment, the wheel cover 12 is formed in a shape that covers a portion of the grinding wheel GW that extends over a substantially half circumference. In the example illustrated in FIG. 1, the wheel cover 12 is disposed at a position that covers a rear portion of the grinding wheel GW. The wheel cover 12 can prevent the grinding powder from flying from the grinding wheel GW toward the user when the grinder 2 is used. It can also be said that the wheel cover 12 covers at least a part of the spindle 32.

  As shown in FIG. 3, the wheel cover 12 includes a band portion 46 and a cover portion 48. The band portion 46 is a curved portion 50 obtained by bending a belt-shaped flat plate into a cylindrical shape, and is bent outward from both ends of the curved portion 50 and extends substantially parallel to each other, and each has a pair of flat plates each having a through hole in the center. Portions 52, 54, an outer wall portion 56 bent from an end portion of the flat plate portion 54, a nut 58 welded to the outer surface of the flat plate portion 54, a lower surface of the flat plate portion 52, and an end portion of the curved portion 50 on the flat plate portion 52 side. A first reinforcing plate 60 having a substantially triangular shape welded to the lower surface of the outer wall 56, a second reinforcing plate welded to the lower surface of the outer wall 56, the lower surface of the flat plate portion 54, and the lower surface of the curved portion 50 on the flat plate portion 54 side. 62, a pressing plate 64 having a shape along the inner surface of the bending portion 50, one end portion being a fixed end welded to the inner surface of the bending portion 50, and the other end portion being a free end; It has a box-shaped cross-sectional shape that covers the upper surface, outer surface, and lower surface of the bending portion 50, and it corresponds to the rotation angle. A lever 66 that pushes the free end of the pressing plate 64 inward, a support pin 68 that rotatably supports the lever 66, and a support plate 70 that is welded to the outer surface of the bending portion 50 and supports the support pin 68. An adjustment screw 72 screwed to the nut 58 via the flat plate portions 52 and 54, a stop ring 74 attached to the adjustment screw 72 between the flat plate portions 52 and 54, and the stop ring 74 and the flat plate portion 54 A stopper member 76 provided therebetween is provided. An opening is formed between the flat plate portions 52 and 54 of the band portion 46. The second reinforcing plate 62 is formed with a contact portion 62 a that protrudes inward from the inner surface of the curved portion 50. On the inner surface of the pressing plate 64, there are formed a pressing rib 64 a that protrudes inward and has a longitudinal direction in the vertical direction, and an engaging rib 64 b that protrudes inward and has a longitudinal direction in the circumferential direction. ing. The lever 66 is formed in such a shape that the free end of the pressing plate 64 is pushed inward greatly as the rotation angle with respect to the bending portion 50 is smaller. For this reason, the lever 66 does not push the free end of the pressing plate 64 inward so much when the lever 66 is open with respect to the bending portion 50, and the pressing plate 64 is not closed when the lever 66 is closed with respect to the bending portion 50. Push the free end inwardly. The stop ring 74 is a rubber ring having a smaller diameter than the outer diameter of the adjustment screw 72 and is attached to the adjustment screw 72 in a state where the diameter is increased. Since the stop ring 74 is attached to the adjustment screw 72, the adjustment screw 72 can be prevented from falling off the flat plate portion 52 even when the adjustment screw 72 is detached from the nut 58.

  As shown in FIG. 4, the stopper member 76 is a sheet metal member formed by processing a sheet metal, and includes a first flat plate portion 76b having a through hole 76a formed in the center, and an inner side of the first flat plate portion 76b. An engaging projection 76c protruding from the end portion and a second flat plate portion 76d bent from the outer end portion of the first flat plate portion 76b are provided. As shown in FIG. 3, when the stopper member 76 is attached to the wheel cover 12, the first flat plate portion 76 b is disposed between the flat plate portion 52 and the flat plate portion 54, and the second flat plate portion 76 d is the outer wall portion 56. Arranged along the outer surface. In this state, the adjustment screw 72 passes through the through hole 76 a, and the engaging protrusion 76 c protrudes inward from the inner surface of the bending portion 50. The stopper member 76 is prohibited from rotating about the adjusting screw 72 as a rotation axis when the second flat plate portion 76d is engaged with the outer wall portion 56.

  The cover portion 48 of the wheel cover 12 includes an inner cylindrical portion 78, a truncated cone portion 80, and an outer cylindrical portion 82. The inner cylindrical portion 78 and the outer cylindrical portion 82 are formed in a cylindrical shape having a substantially semicircular cross section. The truncated cone part 80 is formed in a truncated cone shape that connects the lower end of the inner cylindrical part 78 and the upper end of the outer cylindrical part 82. Engagement ribs 78 a and 78 b that protrude inward and have a longitudinal direction in the circumferential direction are formed on the inner surface of the inner cylindrical portion 78. The band portion 46 and the cover portion 48 are fixed to each other by welding the outer surface of the inner cylindrical portion 78 and the inner surface of the bending portion 50. In the wheel cover 12, the engagement rib 64 b of the pressing plate 64, the engagement ribs 78 a and 78 b of the inner cylindrical portion 78, and the engagement protrusion 76 c of the stopper member 76 are formed so that their vertical positions coincide with each other. Has been.

  As shown in FIG. 5, the bearing box 10 is formed with a substantially cylindrical cover mounting portion 84 that protrudes downward along the rotation axis direction (that is, the vertical direction) of the spindle 32. An annular guide groove 86 is formed on the outer peripheral surface in the vicinity of the lower end of the cover attaching portion 84, and a flange 88 protruding outward is formed on the lower end side of the guide groove 86. The flange 88 is formed with notches 88a, 88b, 88c corresponding to the engagement ribs 64b, 78a, 78b of the wheel cover 12. The notches 88 a, 88 b, 88 c extend in the vertical direction and communicate with the guide groove 86. A contact piece 90 that protrudes downward is formed on the lower surface of the cover attachment portion 84. The contact piece 90 is in contact with the contact portion 62a of the wheel cover 12 and regulates the angle at which the wheel cover 12 can rotate.

  As shown in FIG. 6, when attaching the wheel cover 12 to the grinder 2, first, the wheel cover 12 before attaching the adjustment screw 72, the stop ring 74, and the stopper member 76 is attached to the cover attaching portion 84 of the grinder 2. With the engagement ribs 64 b, 78 a, 78 b of the wheel cover 12 aligned with the notches 88 a, 88 b, 88 c of the cover attachment portion 84, the wheel cover 12 so that the cover attachment portion 84 enters the inside of the band portion 46. Is slid upward with respect to the bearing box 10. As a result, as shown in FIG. 7, the wheel cover 12 to which the adjustment screw 72, the stop ring 74, and the stopper member 76 are not attached is attached to the cover attachment portion 84. Hereinafter, the position of the wheel cover 12 after being attached to the bearing box 10 in a state where the engagement ribs 64b, 78a, 78b are aligned with the notches 88a, 88b, 88c is also referred to as an attaching / detaching position.

  The wheel cover 12 attached to the bearing box 10 can rotate around the cover attachment portion 84. In other words, the wheel cover 12 can rotate around the rotation axis direction (that is, the vertical direction) of the spindle 32 with respect to the bearing box 10. When the wheel cover 12 is rotated with respect to the bearing box 10 from the attachment / detachment position, the engagement ribs 64b, 78a, 78b slide in the guide groove 86, and the flange 88 and the engagement ribs 64b, 78a, 78b engage. Thus, sliding of the wheel cover 12 in the downward direction with respect to the bearing box 10 is prohibited. In this case, the wheel cover 12 cannot be removed from the bearing box 10.

  The wheel cover 12 attached to the bearing box 10 can be rotated from the attachment / detachment position to a position where the contact portion 62 a contacts the contact piece 90. As shown in FIG. 8, after the wheel cover 12 is rotated to a desired position within a rotatable range, the engaging protrusion 76c of the stopper member 76 is inserted into the guide groove 86 of the cover mounting portion 84 as shown in FIG. Then, the adjustment screw 72 is screwed to the nut 58 through the flat plate portion 52, the stop ring 74, the stopper member 76, and the flat plate portion 54. Then, by closing the lever 66 with respect to the curved portion 50, the free end of the pressing plate 64 is pushed inward, and the cover attaching portion 84 is formed by the free end of the pressing plate 64, the pressing rib 64 a, and the inner cylindrical portion 78. Is pressed, and the rotation of the wheel cover 12 relative to the bearing box 10 is prohibited. When the lever 66 is opened with respect to the curved portion 50, the cover mounting portion 84 is not pressed by the free end of the pressing plate 64, the pressing rib 64a, and the inner cylindrical portion 78, and the rotation of the wheel cover 12 with respect to the bearing box 10 is allowed. Is done.

  The wheel cover 12 after the adjustment screw 72, the stop ring 74, and the stopper member 76 are attached is also rotatable around the cover attachment portion 84. When the wheel cover 12 is rotated with respect to the bearing box 10, the engagement ribs 64b, 78a, 78b and the engagement protrusion 76c slide in the guide groove 86, and the flange 88 and the engagement ribs 64b, 78a, 78b are engaged. When the flange 88 and the engagement protrusion 76c engage with each other, the downward sliding of the wheel cover 12 with respect to the bearing box 10 is prohibited. In this case, the wheel cover 12 cannot be removed from the bearing box 10.

  The wheel cover 12 after the adjustment screw 72, the stop ring 74, and the stopper member 76 are attached cannot be removed from the bearing box 10 even when the wheel cover 12 is rotated to the attachment / detachment position. When the wheel cover 12 is in the attaching / detaching position, the engaging ribs 64b, 78a, 78b are aligned with the notches 88a, 88b, 88c, so that the engaging ribs 64b, 78a, 78b do not engage with the flange 88. Since the engaging protrusion 76c of the stopper member 76 engages with the flange 88, the wheel cover 12 is prohibited from sliding downward with respect to the bearing box 10. As described above, it is possible to prevent the wheel cover 12 from being removed from the bearing box 10 by attaching the stopper member 76 to the wheel cover 12.

  The stopper member 76 is prohibited from rotating about the adjusting screw 72 as a rotation axis when the second flat plate portion 76d is engaged with the outer wall portion 56. For this reason, it is possible to prevent the engagement protrusion 76 c from coming off the guide groove 86 due to the rotation of the stopper member 76.

  As shown in FIG. 10, the stop ring 74 may be attached to the adjustment screw 72 on the nut 58 side of the stopper member 76. According to this configuration, when the adjustment screw 72 is removed from the nut 58, the stopper member 76 is held by the flat plate portion 52 and the stop ring 74, so that not only the adjustment screw 72 can be prevented from dropping, but also the stopper member 76 can be removed. Can also be prevented.

  In the grinder 2 of the present embodiment, a wheel cover 92 shown in FIG. 11 may be used instead of the wheel cover 12. The wheel cover 92 has substantially the same configuration as the wheel cover 12, but does not include the pressing plate 64, the lever 66, the support pin 68, the support plate 70, and the stop ring 74. In the wheel cover 92, instead of the engagement rib 64b of the pressing plate 64, an engagement rib 50a is formed on the inner surface of the curved portion 50 so as to protrude inward and have a longitudinal direction in the circumferential direction. In the wheel cover 92, when the adjustment screw 72 is tightened, the curved portion 50 and the inner cylindrical portion 78 are pressed against the cover mounting portion 84, and the rotation of the wheel cover 12 relative to the bearing box 10 is prohibited. When the adjustment screw 72 is loosened, the curved portion 50 and the inner cylindrical portion 78 are not pressed by the cover attaching portion 84, and the rotation of the wheel cover 12 relative to the bearing box 10 is allowed. Similarly to the case of using the wheel cover 12, even when the wheel cover 92 is used, the wheel cover 92 can be prevented from being removed from the bearing box 10 by attaching the stopper member 76.

  In the grinder 2 of the present embodiment, a stopper member 94 shown in FIG. 12 may be used instead of the stopper member 76. The stopper member 94 is a sheet metal member formed by processing a sheet metal, and includes a first flat plate portion 94b in which a through hole 94a is formed in the center, and a projection protruding from an inner end portion of the first flat plate portion 94b. A mating protrusion 94c and a second flat plate portion 94d bent from the lower surface of the first flat plate portion 94b are provided. In a state where the stopper member 94 is attached to the wheel cover 12, the first flat plate portion 94 b is disposed between the flat plate portion 52 and the flat plate portion 54, and the engagement protrusion 94 c is inserted into the guide groove 86 of the cover attachment portion 84. The second flat plate portion 94d is disposed along the lower surface of the first reinforcing plate 60, and the adjustment screw 72 passes through the through hole 94a. Similarly to the case where the stopper member 76 is used, the wheel cover 12 can be prevented from being removed from the bearing box 10 by using the stopper member 94. Further, in the stopper member 94, the second flat plate portion 94 d is engaged with the first reinforcing plate 60, so that rotation around the adjustment screw 72 is prohibited. It is possible to prevent the engagement protrusion 94c from being detached from the guide groove 86.

  Alternatively, a stopper member 96 shown in FIG. 13 may be used instead of the stopper member 76. The stopper member 96 is a sheet metal member formed by processing a sheet metal, and includes a first flat plate portion 96b having a through hole 96a formed in the center, and a protrusion protruding from an inner end portion of the first flat plate portion 96b. A mating projection 96c, a folded portion 96d bent from the outer end portion of the first flat plate portion 96b, and a second flat plate portion bent inward from the end portion of the folded portion 96d and having a through hole 96e formed in the center. 96f is provided. In a state where the stopper member 96 is assembled to the wheel cover 12, the first flat plate portion 96 b and the second flat plate portion 96 f are disposed between the flat plate portion 52 and the flat plate portion 54, and the engagement protrusion 96 c is formed on the cover mounting portion 84. The adjusting screw 72 is inserted into the guide groove 86 and penetrates the through holes 96a and 96e. Similarly to the case where the stopper member 76 is used, the wheel cover 12 can be prevented from being removed from the bearing box 10 by using the stopper member 96.

  As described above, the grinder 2 (an example of an electric tool) according to an embodiment includes the motor 14, the bevel gear 34 (an example of a speed reduction mechanism) connected to the motor 14, and the housing 44 that houses the motor 14 and the bevel gear 34. A spindle 32 connected to the bevel gear 34 (an example of a tip tool holding portion), wheel covers 12 and 92 (an example of a cover) covering at least a part of the spindle 32, and a stopper attached to the wheel covers 12 and 92 Members 76, 94, and 96 are provided. The wheel covers 12, 92 have engagement ribs 64b, 78a, 78b, 50a. The housing 44 has a flange 88 (an example of an engagement wall) that engages with the engagement ribs 64b, 78a, 78b, and 50a. The flange 88 has notches 88a, 88b, 88c through which the engaging ribs 64b, 78a, 78b, 50a pass when the wheel covers 12, 92 are attached to the housing 44. The stopper members 76, 94, 96 have engagement protrusions 76 c, 94 c, 96 c (examples of engagement portions) that engage with the flange 88.

  In the grinder 2 according to the embodiment, the wheel covers 12 and 92 include a band portion 46 having an opening. The engaging ribs 64b, 78a, 78b, 50a are formed on the inner peripheral surface of the band portion 46. The stopper members 76, 94, 96 are attached to the wheel covers 12, 92 so as to be disposed at the opening of the band portion 46.

  In the grinder 2 according to the embodiment, the wheel covers 12 and 92 include an adjusting screw 72 that can adjust the interval between the openings. The stopper members 76, 94, 96 are made of sheet metal members having through holes 76a, 94a, 96a. The adjustment screw 72 passes through the through holes 76a, 94a, 96a and holds the stopper members 76, 94, 96.

  In the grinder 2 according to the embodiment, the wheel cover 12 further includes a rubber stop ring 74 attached to the adjustment screw 72.

  In the grinder 2 according to the embodiment, the stopper members 76 and 94 include first flat plate portions 76b and 94b having through holes 76a and 94a, and second flat plate portions 76d and 94d bent from the first flat plate portions 76b and 94b. I have.

  The grinder 2 (an example of an electric tool) according to an embodiment includes a motor 14, a housing 44 that houses the motor 14, a spindle 32 (an example of a tip tool holding unit) that is driven by the motor 14, and at least the spindle 32. The wheel covers 12 and 92 (an example of a cover) that partially cover and can rotate around the rotation axis with respect to the housing 44, and engagement ribs 64b, 78a, 78b, and 50a provided on the wheel covers 12 and 92 (Example of first engaging portion) and engaging protrusions 76c, 94c, 96c (example of second engaging portion) of stopper members 76, 94, 96 and a housing 44 are provided on the wheel covers 12, 92. The flank that can be engaged with the engaging ribs 64b, 78a, 78b, 50a and the engaging protrusions 76c, 94c, 96c with respect to the vertical direction that is the direction along the rotation axis 88 (example of the engaged portion), and a. The flange 88 is engaged with at least one of the engagement ribs 64b, 78a, 78b, 50a and the engagement protrusions 76c, 94c, 96c regardless of the rotation angle of the wheel covers 12, 92 with respect to the housing 44. 12 and 92 cannot move with respect to the housing 44 in the direction along the rotation axis of the wheel covers 12 and 92.

(Example 2)
The grinder 102 of the present embodiment has the same configuration as the grinder 2 of the first embodiment. Below, only the point which is different from the grinder 2 of Example 1 is demonstrated in detail.

  As shown in FIG. 14, the grinder 102 of the present embodiment includes a wheel cover 104 instead of the wheel cover 12 of the first embodiment. Further, the grinder 102 of the present embodiment includes a lock mechanism 106 for fixing the rotation angle of the wheel cover 104.

  As shown in FIG. 15, the wheel cover 104 includes a band portion 108, an upper surface portion 110, and a side surface portion 112. The band part 108 has a substantially cylindrical shape extending in the vertical direction. As shown in FIG. 16, on the inner peripheral surface of the band portion 108, engagement ribs 108a, 108b, and 108c having a longitudinal direction in the circumferential direction are formed. Further, as shown in FIG. 15, the band portion 108 is formed with a plurality of through holes 108d at predetermined angular intervals within a predetermined angular range. Furthermore, a screw hole 108e is formed in the band portion 108. The engaging ribs 108a, 108b, 108c and the screw hole 108e are aligned with each other in the vertical direction. The upper surface portion 110 includes an annular portion 110a extending in the radial direction from the lower end portion of the band portion 108, and a substantially semicircular semicircular portion 110b extending in the radial direction from the outer end portion of the annular portion 110a. . The side surface portion 112 includes a substantially semi-cylindrical semi-cylindrical portion 112a extending downward from the outer end portion of the semi-circular portion 110b, and a narrowed portion 112b bent inward from the lower end of the semi-cylindrical portion 112a. Unlike the wheel cover 12 of the first embodiment, the wheel cover 104 of the present embodiment does not include a contact portion 62a for regulating the rotation angle. For this reason, as shown in FIG. 17, in the grinder 102 of the present embodiment, the contact piece 90 is not formed on the lower surface of the cover mounting portion 84.

  As shown in FIG. 17, the lock mechanism 106 is attached to the bearing box 10. The lock mechanism 106 includes a lock plate 114, sleeves 116 and 118, and a compression spring 120.

  As shown in FIG. 18, the lock plate 114 has a flat base 114a extending in the left-right direction in a shape that does not interfere with the gear housing 8 and the bearing box 10, and an operation part 114b extending upward from the left end of the base 114a. Long holes 114c and 114d that are formed in the base portion 114a and have a longitudinal direction in the left-right direction, a locking portion 114e that protrudes toward the left in the vicinity of the right end portion of the base portion 114a, and a long hole 114c in the base portion 114a A first pillar 114f and a second pillar 114g projecting upward between the long holes 114d, and a first protrusion extending rightward (toward the second pillar 114g) from the first pillar 114f. 114h and the 2nd convex part 114i extended toward the left direction (toward the 1st pillar part 114f) from the 2nd pillar part 114g.

  As shown in FIG. 17, the lock plate 114 is attached to a screw 122 a arranged on the left rear side and a screw 122 d arranged on the right rear side among the screws fixing the bearing box 10 to the gear housing 8. It has been. The screw 122 a extends in the vertical direction, passes through the long hole 114 c of the lock plate 114, and fastens the sleeve 116, the bearing box 10, and the gear housing 8. The screw 122b extends in the vertical direction, passes through the long hole 114d of the lock plate 114, and fastens the sleeve 118, the bearing box 10, and the gear housing 8. The lock plate 114 is held by screws 122a and 122b so as to be slidable in the left-right direction.

  In the grinder 102 of the present embodiment, a spring receiving portion 10 a is formed in the bearing box 10. The compression spring 120 is attached to the lock plate 114 with the first protrusion 114h inserted at one end and the second protrusion 114i inserted at the other end. The lock plate 114 is attached to the bearing box 10 so that the end of the compression spring 120 on the second convex portion 114i side comes into contact with the spring receiving portion 10a. For this reason, the compression spring 120 urges the lock plate 114 in the left direction with respect to the bearing box 10, that is, in a direction in which the locking portion 114 e approaches the cover attachment portion 84.

  As shown in FIG. 14, when using the grinder 102, the engagement screw 126 is attached to the screw hole 108 e of the wheel cover 104 via the washer 124. As shown in FIG. 19, the engaging screw 126 passes through the washer 124 and is screwed into the screw hole 108 e, and the tip protrudes inward from the inner surface of the band portion 108, so that the cover mounting portion 84 It has entered the guide groove 86.

  As shown in FIG. 20, when attaching the wheel cover 104 to the grinder 102, first, the wheel cover 104 before attaching the washer 124 and the engagement screw 126 is attached to the cover attaching portion 84 of the grinder 102. With the engaging ribs 108a, 108b, 108c of the wheel cover 104 aligned with the notches 88a, 88b, 88c of the cover mounting portion 84, the operating portion 114b of the lock plate 114 is pushed in, and the locking portion 114e is attached to the cover. While being separated from the portion 84, the wheel cover 104 is slid upward with respect to the bearing box 10 so that the cover attaching portion 84 enters the inside of the band portion 108. As a result, the wheel cover 104 is attached to the bearing box 10 as shown in FIG.

  When the wheel cover 104 is rotated with respect to the bearing box 10 from the attachment / detachment position, the engagement ribs 108a, 108b, 108c slide in the guide groove 86, and the flange 88 and the engagement ribs 108a, 108b, 108c engage. Thus, the downward sliding of the wheel cover 104 with respect to the bearing box 10 is prohibited. In this case, the wheel cover 104 cannot be removed from the bearing box 10.

  The wheel cover 104 is rotated with respect to the bearing box 10 so that the locking portion 114e of the lock plate 114 is aligned with one of the plurality of through holes 108d of the band portion 108, and the operation portion 114b of the lock plate 114 is positioned. When the hand is released, the locking portion 114e enters the through hole 108d by the urging force of the compression spring 120. In this state, since the wheel cover 104 is engaged with the lock plate 114, the rotation of the wheel cover 104 relative to the bearing box 10 is prohibited, and the wheel cover 104 is fixed to the bearing box 10. When the rotation angle of the wheel cover 104 with respect to the bearing box 10 is changed, the user pushes in the operation portion 114b of the lock plate 114 so that the locking portion 114e is pulled out from the through hole 108d. 104 can be rotated relative to the bearing box 10. A rotation angle for fixing the wheel cover 104 to the bearing box 10 can be selected by appropriately selecting the through hole 108d into which the locking portion 114e enters.

  As shown in FIG. 22, after rotating the wheel cover 104 to a desired position, the washer 124 and the engagement screw 126 are screwed into the screw hole 108e, so that the wheel cover 104 is attached to the wheel cover 104 as shown in FIG. A washer 124 and an engagement screw 126 are attached.

  The wheel cover 104 after the washer 124 and the engagement screw 126 are attached is also rotatable around the cover attachment portion 84. When the wheel cover 104 is rotated with respect to the bearing box 10, the engagement ribs 108a, 108b, 108c and the engagement screw 126 slide in the guide groove 86, and the flange 88 and the engagement ribs 108a, 108b, 108c are engaged. When the flange 88 and the engagement screw 126 engage with each other, the downward sliding of the wheel cover 104 with respect to the bearing box 10 is prohibited. In this case, the wheel cover 104 cannot be removed from the bearing box 10.

  The wheel cover 104 after the washer 124 and the engagement screw 126 are attached cannot be removed from the bearing box 10 even when the wheel cover 104 is rotated to the attachment / detachment position. When the wheel cover 104 is in the attach / detach position, the engagement ribs 108a, 108b, and 108c are aligned with the notches 88a, 88b, and 88c, so that the engagement ribs 108a, 108b, and 108c do not engage the flange 88. Since the engagement screw 126 engages with the flange 88, sliding of the wheel cover 104 downward with respect to the bearing box 10 is prohibited. As described above, it is possible to prevent the wheel cover 104 from being removed from the bearing box 10 by attaching the engagement screw 126 to the wheel cover 104.

  In addition, after attaching the engagement screw 126 to the wheel cover 104, the screw thread may be crushed so that it cannot be removed from the screw hole 108e. Alternatively, a special screw that cannot be removed with a commercially available tool may be used as the engagement screw 126.

  Alternatively, a through hole may be formed in the wheel cover 104 instead of the screw hole 108e, and an engagement rivet may be attached to the through hole instead of the engagement screw 126. Also in this case, it is possible to prevent the wheel cover 104 from being removed from the bearing box 10 by engaging the front end of the engagement rivet with the flange 88.

  As described above, the grinder 102 (an example of an electric tool) according to an embodiment includes the motor 14, the bevel gear 34 (an example of a speed reduction mechanism) connected to the motor 14, and the housing 44 that houses the motor 14 and the bevel gear 34. A spindle 32 (an example of a tip tool holding portion) connected to the bevel gear 34, a wheel cover 104 (an example of a cover) that covers at least a part of the spindle 32, and an engagement screw 126 (attached to the wheel cover 104). An example of a stopper member) is provided. The wheel cover 104 has engagement ribs 108a, 108b, and 108c. The housing 44 has a flange 88 (an example of an engagement wall) that engages with the engagement ribs 108a, 108b, and 108c. The flange 88 has notches 88a, 88b, 88c through which the engaging ribs 108a, 108b, 108c pass when the wheel cover 104 is attached to the housing 44. The engagement screw 126 has a tip end portion (an example of an engagement portion) that engages with the flange 88.

  A grinder 102 (an example of an electric tool) according to an embodiment includes a motor 14, a housing 44 that houses the motor 14, a spindle 32 (an example of a tip tool holding unit) that is driven by the motor 14, and at least the spindle 32. A wheel cover 104 (an example of a cover) that partially covers and is rotatable about the rotation axis with respect to the housing 44, and engagement ribs 108a, 108b, 108c (first engagement portions) provided on the wheel cover 104 And the engagement screw 126 (example of the second engagement portion) and the engagement ribs 108a, 108b, 108c and the engagement screw with respect to the direction along the rotation axis of the wheel cover 104. 126 and an engaging flange 88 (an example of an engaged portion). The flange 88 is engaged with at least one of the engagement ribs 108 a, 108 b, 108 c and the engagement screw 126 regardless of the rotation angle of the wheel cover 104 with respect to the housing 44. The wheel cover 104 cannot move in the direction along the rotation axis.

  In each of the above embodiments, the convex portions (engagement protrusions 76c, 94c, 96c, the tip portions of the engagement screws 126) on the wheel cover 12, 92, 104 side are concave portions (guide grooves 86) on the housing 44 side. The case where the wheel covers 12, 92, 104 and the housing 44 are engaged with each other has been described. Unlike this, the convex portion on the housing 44 side may enter the concave portion on the wheel cover 12, 92, 104 side, and the wheel cover 12, 92, 104 and the housing 44 may be engaged.

  In each of the above embodiments, the case where the motor 14 and the spindle 32 are connected via the bevel gear 34 that is a speed reduction mechanism has been described. Unlike this, the motor 14 and the spindle 32 may be directly connected or may be connected via a mechanism that does not decelerate.

  In each of the above embodiments, the case where the rotation axis of the output shaft 16 of the motor 14 and the rotation axis of the spindle 32 are orthogonal to each other has been described. In contrast, the rotation axis of the output shaft 16 of the motor 14 and the rotation axis of the spindle 32 may intersect at an angle other than 90 degrees, may be coaxial with each other, or may be parallel to each other. May be. Further, the output shaft 16 of the motor 14 may extend in the vertical direction.

  In each of the above embodiments, the case where the electric tool is the grinder 2 or 102, the tip tool holding portion is the spindle 32, and the cover is the wheel cover 12, 92, or 104 has been described as an example. This kind of electric tool may be used, the tip tool holding part may be another kind of tip tool holding part, and the cover may be another kind of cover.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2: Grinder 4: Motor housing 6: Rear housing 8: Gear housing 10: Bearing box 10a: Spring receiving part 12: Wheel cover 14: Motor 16: Output shaft 18: Bearing 20: Bearing 22: Power supply circuit 24: Power supply cord 26 : Switch 28: First bevel gear 30: Second bevel gear 32: Spindle 34: Bevel gear 36: Bearing 38: Shaft lock 40: Bearing 42: Bearing 44: Housing 46: Band part 48: Cover part 50: Curved part 50a: Engagement Rib 52: Flat plate portion 54: Flat plate portion 56: Outer wall portion 58: Nut 60: First reinforcing plate 62: Second reinforcing plate 62a: Abutting portion 64: Press plate 64a: Press rib 64b: Engaging rib 66: Lever 68 : Support pin 70: Support plate 72: Adjustment screw 74 Stop ring 76: Stopper member 76a: Through hole 76b: First flat plate portion 76c: Engaging protrusion 76d: Second flat plate portion 78: Inner cylindrical portion 78a: Engaging rib 78b: Engaging rib 80: Frustum portion 82: Outer Cylindrical part 84: Cover attaching part 86: Guide groove 88: Flange 88a: Notch 88b: Notch 88c: Notch 90: Contact piece 92: Wheel cover 94: Stopper member 94a: Through hole 94b: First flat plate part 94c : Engaging projection 94d: second flat plate portion 96: stopper member 96a: through hole 96b: first flat plate portion 96c: engaging projection 96d: folded portion 96e: through hole 96f: second flat plate portion 102: grinder 104: wheel cover 106: Lock mechanism 108: Band portion 108a: Engaging rib 108b: Engaging rib 108c: Engaging rib 108 : Through hole 108e: Screw hole 110: Upper surface portion 110a: Ring portion 110b: Semicircular portion 112: Side surface portion 112a: Semi-cylindrical portion 112b: Restriction portion 114: Lock plate 114a: Base portion 114b: Operation portion 114c: Long hole 114d : Long hole 114e: Locking part 114f: 1st pillar part 114g: 2nd pillar part 114h: 1st convex part 114i: 2nd convex part 116: Sleeve 118: Sleeve 120: Compression spring 122a: Screw 122b: Screw 122d: Screw 124: Washer 126: Engagement screw

Claims (6)

A motor,
A speed reduction mechanism connected to the motor;
A housing for housing the motor and the speed reduction mechanism;
A tip tool holding portion connected to the speed reduction mechanism;
A cover covering at least a part of the tip tool holding portion;
A stopper member attached to the cover;
The cover has an engagement rib;
The housing has an engaging wall that engages with the engaging rib;
The engagement wall has a notch through which the engagement rib passes when the cover is attached to the housing;
The power tool, wherein the stopper member has an engaging portion that engages with the engaging wall. The cover includes a band portion having an opening;
The engagement rib is formed on the inner peripheral surface of the band portion;
The electric tool according to claim 1, wherein the stopper member is attached to the cover so as to be disposed in the opening. The cover includes an adjustment screw capable of adjusting the interval between the openings,
The stopper member is a sheet metal member having a through hole,
The electric tool according to claim 2, wherein the adjustment screw passes through the through hole and holds the stopper member.   The electric tool according to claim 3, wherein the cover further includes a rubber stop ring attached to the adjustment screw.   The electric tool according to claim 3 or 4, wherein the stopper member includes a first flat plate portion having the through hole and a second flat plate portion bent from the first flat plate portion. A motor,
A housing for housing the motor;
A tip tool holder driven by the motor;
A cover that covers at least a portion of the tip tool holding portion and is rotatable about a rotation axis with respect to the housing;
A first engagement portion and a second engagement portion provided on the cover;
An engagement portion that is provided in the housing and is engageable with the first engagement portion and the second engagement portion in a direction along the rotation axis;
The engaged portion is engaged with at least one of the first engaging portion and the second engaging portion regardless of a rotation angle of the cover with respect to the housing, and the cover is in contact with the housing. A power tool that is immovable in a direction along the rotation axis.

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