Portable grinder

Abstract

The present application provides a portable sander. The portable sander has a sanding portion, a driving mechanism, a housing, and a handle portion, wherein the driving mechanism is used to drive the sanding portion; the housing is used to accommodate the driving mechanism; and the handle portion has a rotation axis and is rotatable about the rotation axis. The handle portion has a gripping portion having a first surface and a second surface different in shape from the first surface, thereby forming a rotationally asymmetric shape with respect to the rotation axis. The handle portion is configured to be installed on the housing in a manner that a rotation angle about the rotation axis is switchable between a first angle and a second angle different from the first angle. The handle portion is configured such that, when the gripping portion is observed along a direction of the rotation axis, positions of the first surface and the second surface in a circumferential direction around the rotation axis are different between when the rotation angle is the first angle and when the rotation angle is the second angle. Accordingly, the operability can be improved.

Description

Technical Field

[0001] This invention relates to a portable grinder. Background Technology

[0002] Patent Document 1 describes a portable grinding machine for grinding workpieces, comprising a drive mechanism, a rotating working surface, and a cylindrical housing. The rotating working surface is positioned below the drive mechanism and is driven to rotate by the drive mechanism. The cylindrical housing houses the drive mechanism. A movable handle, which can be fixed to any position in the circumferential direction, is mounted on the housing.

[0003] [Existing Technical Documents]

[0004] [Patent Literature]

[0005] Patent Document 1: Japanese Patent Publication No. 2011-31383 Summary of the Invention

[0006] [The technical problem that the invention aims to solve]

[0007] In the grinder described in Patent Document 1, the user can fix the movable handle to any position in the circumferential direction of the housing according to the working method. However, in recent years, there has been a desire for a portable grinder that is more user-friendly.

[0008] [Technical solutions used to solve technical problems]

[0009] This invention can be implemented in the following ways.

[0010] According to a first aspect of the present invention, a portable grinder is provided. The portable grinder has a grinding section, a drive mechanism, a housing, and a handle, wherein the drive mechanism is configured to drive the grinding section; the housing is used to house the drive mechanism. The handle is configured to rotate about a rotation axis. The handle has a gripping portion. The gripping portion has a first surface and a second surface with a different shape from the first surface, thereby forming a rotationally asymmetrical shape relative to the rotation axis. The handle is configured to be mounted on the housing at a first angle, whereby a rotational angle about the rotation axis is used as the first angle. Furthermore, the handle is configured to be mounted on the housing at a second angle, different from the first angle, whereby a rotational angle about the rotation axis is used as the second angle, when the gripping portion is viewed along the rotation axis. The handle is configured such that, when the gripping portion is viewed along the rotation axis, the positions of the first surface and the second surface in the circumferential direction around the rotation axis are different when mounted on the housing at the first angle and when mounted on the housing at the second angle.

[0011] According to this method, the user can change the displayed positions of the first and second surfaces by switching the rotation angle of the handle between the first and second angles. Therefore, the handle can be rotated for gripping depending on the working method. This improves the operability of the portable grinder.

[0012] According to a second aspect of the present invention, a portable grinder is provided. The portable grinder has a grinding section, a drive mechanism, a housing, and a handle, wherein the drive mechanism drives the grinding section; the housing houses the drive mechanism. The handle is configured to rotate about a rotation axis. The handle is configured to be mounted on the housing with a rotation angle about the rotation axis as at least a first angle. The handle has a gripping portion, a shaft, and a locking portion, wherein the shaft protrudes from the gripping portion and extends along the rotation axis; the locking portion protrudes from the shaft in a direction intersecting the rotation axis. The housing has a first space, a second space, and a third space. When the rotation angle is the first angle, the first space has a shape for accommodating the locking portion. The first space is configured such that the locking portion is restricted from rotating about the rotation axis by abutting against the locking portion on the inner surface of the housing forming the first space. Furthermore, the first space is formed such that, when the direction in which the grip portion moves away from the housing along the rotation axis is defined as the first direction, and the direction opposite to the first direction is defined as the second direction, movement from the first space to the first direction is restricted by the inner surface of the housing forming the first space abutting against the locking portion. The second space is provided on the second direction side of the first space and is formed in a manner communicating with the first space. The second space has a shape that allows the locking portion to rotate about the rotation axis. The third space is formed along the rotation axis and is formed in a manner communicating with the outer space of the housing. When the rotation angle is a third angle different from the first angle, the third space accommodates the locking portion in a manner that allows movement along the rotation axis. The third space is formed such that rotation of the locking portion about the rotation axis is restricted by the inner surface of the housing forming the third space abutting against the locking portion.

[0013] According to this method, the rotation angle of the handle is switched to a third angle, different from the first angle, causing the locking part to move along the third space to the second space. In the second space, the rotation angle is switched back to the first angle, and then the locking member can be configured and housed in the first space. Therefore, the handle can be mounted to the housing at the first angle. Furthermore, the handle, which is mounted to the housing at the first angle and housed in the first space, is switched to the third angle in the second space, and then the locking member is moved along the third space in the first direction, thereby allowing the handle to be detached from the housing. Therefore, by simply switching the angle, the handle can be moved along the rotation axis and mounted and detached relative to the housing. As a result, the operability of the portable grinder can be improved. Attached Figure Description

[0014] Figure 1 This is a right view of a grinder according to one embodiment, showing the state in which the first surface of the handle is on the upper side and the second surface is on the lower side.

[0015] Figure 2 This is a longitudinal sectional view of the grinding machine, a diagram used to illustrate the general structure of the internal components.

[0016] Figure 3 This is a right view of the grinder after the battery has been removed.

[0017] Figure 4 This is the front view of the grinder after the handle has been removed.

[0018] Figure 5 This is a perspective view of the handle, showing the first surface on the top and the second surface on the bottom.

[0019] Figure 6 This is a perspective view of the handle, showing the state where the second surface is on the top and the first surface is on the bottom.

[0020] Figure 7 This is a longitudinal sectional view of the grip mounting section, a schematic diagram used to illustrate the structure of the grip mounting section.

[0021] Figure 8 yes Figure 3 A transverse sectional view of the grip mounting section viewed from direction VIII-VIII.

[0022] Figure 9 This is the front view of the grip mounting section.

[0023] Figure 10 It is a longitudinal sectional view of the grip and grip mounting part, and is a diagram showing the state in which the locking member is inserted into the second space with the rotation angle of the grip as the third angle.

[0024] Figure 11It is a longitudinal sectional view of the grip and grip mounting parts, and is a diagram showing the state in which the rotation angle of the grip is rotated to the first angle in the second space.

[0025] Figure 12 This is a longitudinal sectional view of the grip portion and the grip mounting portion, showing the state in which the grip portion is rotated at the first angle, the locking member is housed in the first space, and the grip portion is mounted on the housing.

[0026] Figure 13 This is a top view of the grip and a cross-sectional view of the grip mounting part. It is a diagram showing the state in which the grip is rotated at the first angle, the locking member is housed in the first space, and the grip is mounted on the housing.

[0027] Figure 14 This is a longitudinal sectional view of the grip portion and the grip mounting portion, showing the state in which the grip portion is rotated at the second angle, the locking member is housed in the first space, and the grip portion is mounted on the housing.

[0028] Figure 15 yes Figure 3 The XV-XV view shows the state in which the grip is rotated at the first angle, the locking member is housed in the first space, and the grip is mounted on the housing.

[0029] [Explanation of reference numerals in the attached figures]

[0030] 10: Grinding machine; 20: Housing; 22: Handle; 25: Switch; 30: Grinding part; 31: Grinding pad; 32: Base; 33: Clamp; 34: Operating handle; 35: Clamp; 36: Operating handle; 40: Battery mounting part; 50: Battery; 52: Controller; 60: Drive mechanism; 61: Electric motor; 62: Bearing; 63: Bearing; 64: Bearing; 65: Balancer; 66: Drive shaft; 71: Fan; 72: Dust collection nozzle; 73: Foot; 80: Handle part; 81: Holding part; 85: Base; 86: First base; 87: Second base; 90: Handle part shaft; 91: Protruding end; 92: Through hole; 94: Sleeve; 96: Locking component; 98: Force application component; 100: Handle mounting part; 1 01: Open end; 110: Base insertion part; 112: Rear end face; 120: Sleeve insertion part; 122: Rear end face; 130: First space; 131: Front end face; 133: Upper end face; 135: Lower end face; 140: Second space; 150: Shaft insertion part; 160: Third space; 161: End face; 611: Motor shaft; 612: Motor body part; 661: One end of the drive shaft; 811: First surface; 812: Second surface; 813: Protrusion; 814: Arc-shaped curved surface; 819: First end; 862: Connecting surface; 871: Support surface; 872: Rear end face; 941: Front end face; A1: Drive axis; A2: Rotation axis of the grip part; A3: Central axis of the grip mounting part. Detailed Implementation

[0031] The following describes in detail, with reference to the accompanying drawings, representative and non-limiting examples of the invention. This detailed description is merely intended to demonstrate preferred embodiments for carrying out the invention to those skilled in the art, and is not intended to limit the scope of the invention. Furthermore, in order to provide further improved portable grinders, methods of manufacturing them, and methods of use, the additional technical features and solutions disclosed below may be used alone or in combination with other technical features or solutions.

[0032] Furthermore, the combinations of technical features or processes disclosed in the following detailed description are not essential for implementing the invention in the broadest sense, but are merely descriptions for illustrating representative specific examples of the invention. Moreover, when providing additional and useful embodiments of the invention, it is not necessary to combine the various technical features of the above and below representative examples and the various technical features described in the technical solutions in the order described herein or in the specific examples listed.

[0033] All technical features and characteristics described in this specification and / or technical solution differ in structure from those described in the implementation method and / or technical solution. These are disclosed separately and independently as limitations on specific aspects of the original application and the technical solution. Furthermore, descriptions of all numerical ranges and groups or categories are disclosed as limitations on specific aspects of the original application and the technical solution, representing intermediate structures of these categories.

[0034] In one or more embodiments, the drive mechanism may have a drive shaft with one end connected to the grinding part. Alternatively, the direction of extension of the drive shaft can be defined as the vertical direction, the side of the drive shaft connected to the grinding part in the vertical direction can be defined as the lower side, and the opposite side of the lower side can be defined as the upper side. In this case, the handle portion is configured such that when the rotation angle of the handle portion is the first angle, the first surface is located on the upper side of the grip portion. The handle portion may also be configured such that when the rotation angle of the handle portion is the first angle, the second surface is located on the lower side of the grip portion.

[0035] According to the above method, when the rotation angle of the handle is the first angle, the first surface is visible on the upper side and the second surface is visible on the lower side. In this structure, the operability of the portable grinder can be improved.

[0036] In one or more embodiments, the drive mechanism may have a drive shaft with one end connected to the grinding part. Alternatively, the direction of extension of the drive shaft may be defined as the vertical direction, the side of the drive shaft connected to the grinding part in the vertical direction may be defined as the lower side, and the opposite side of the lower side may be defined as the upper side. In this case, the handle portion is configured such that when the rotation angle of the handle portion is the second angle, the second surface is located on the upper portion of the grip portion. Alternatively, the handle portion may be configured such that when the rotation angle of the handle portion is the second angle, the first surface is located on the lower portion of the grip portion.

[0037] According to the above method, when the rotation angle of the handle is the second angle, the second surface appears on the upper side and the first surface appears on the lower side. In this structure, the operability of the portable grinder can be improved.

[0038] In particular, when the rotation angle is the first angle, the first surface appears on the upper side and the second surface appears on the lower side, and when the rotation angle is the second angle, the second surface appears on the upper side and the first surface appears on the lower side. In this structure, by reversing the grip portion around the rotation axis (rotating 180°), the surface shape of the upper and lower sides can be switched from the first surface to the second surface or from the second surface to the first surface.

[0039] In one or more embodiments, a protrusion may be formed on the second surface. The protrusion may be formed at an end in the direction of the rotation axis, away from the housing. The protrusion may project in a direction away from the rotation axis.

[0040] According to the above method, the user can place their fingers on the raised part, making it easier to grip the part compared to a structure where the second surface does not have a raised part. Therefore, the operability of the portable grinder can be further improved.

[0041] In particular, for structures where a protrusion is provided on the second surface and the second surface is located on the lower side when the rotation angle is the first angle, it is easier for the user to place their fingers on the protrusion when holding the grip from top to bottom. Therefore, the operability of the grinding operation can be further improved.

[0042] In one or more embodiments, when the gripping portion is viewed from a position directly opposite the second surface, the protrusion may be formed in a crescent shape. The shape of the crescent may be such that, in the direction of the rotation axis, the housing side is recessed and the side away from the housing bulges out.

[0043] According to the above method, the user can press the edge of their palm along the protrusion towards the second surface to perform the grinding operation. Therefore, the way the handle is held can be diversified, thereby improving the operability of the portable grinder.

[0044] In particular, in a structure where the second surface is on the upper side when the rotation angle is the second angle, the user can press their palm against the second surface to push the portable grinder towards the workpiece, while simultaneously moving the edge of the palm along the protrusion to move the portable grinder in the desired direction. Furthermore, for example, in the finishing stage of a workpiece grinding operation, the force pushing the portable grinder towards the workpiece may sometimes be reduced compared to the initial stage. In such cases, it is easy to move the portable grinder in the desired direction while applying an appropriate downward force.

[0045] In one or more embodiments, the first surface may be formed as a smooth surface. When viewed from a position directly opposite the first surface, the gripping portion may be formed as an ellipse having a major axis in a direction intersecting the axis of rotation.

[0046] According to the above method, the user can easily hold the gripping part by covering the first surface with their palm. Therefore, the operability of the portable grinder can be improved.

[0047] In particular, in a structure where the first surface is on the upper side and the second surface is on the lower side when the grip is rotated at the first angle, and a protrusion is provided on the second surface, the user can grip the grip by placing their fingers on the protrusion of the second surface while wrapping their palm around the first surface. Therefore, the grip can be held stably.

[0048] In one or more embodiments, the handle portion may have a shaft and a locking portion. The shaft may protrude from the grip portion and extend along the axis of rotation. The locking portion may be formed to protrude from the axial direction intersecting the axis of rotation. The housing may have a first space and a second space. When the rotation angle of the handle portion is the first angle, the first space may be shaped to accommodate the locking portion. Additionally, when the rotation angle of the handle portion is the second angle, the first space may be shaped to accommodate the locking portion. The first space may restrict the locking portion from rotating about the axis of rotation by abutting against the locking portion with the inner surface of the housing forming the first space. When the direction in which the handle portion moves away from the housing in the direction of the axis of rotation is defined as a first direction, and the direction opposite to the first direction is defined as a second direction, the second space may be provided on the second direction side of the first space and communicate with the first space. The second space may have a shape that allows the locking portion to rotate about the axis of rotation.

[0049] According to the above method, by setting the rotation angle of the handle as either the first angle or the second angle, the user can accommodate the locking part in the first space, thereby fixing the rotation angle of the handle and mounting the handle to the housing. Alternatively, by moving the locking part from the first space to the second direction and rotating it in the second space, the rotation angle of the handle can be switched from the first angle to the second angle or from the second angle to the first angle. After accommodating the locking part in the first space, the rotation angle of the handle can be switched to mount it to the housing. Therefore, the rotation angle of the handle can be easily switched.

[0050] In one or more embodiments, the first space may also be configured such that the locking portion is restricted from moving from the first space toward the first direction by abutting the inner surface of the inner surface of the housing forming the first space on the first direction side with the locking portion.

[0051] According to the above method, the movement of the locking part contained in the first space from the first space to the first direction can be restricted.

[0052] In one or more embodiments, the housing may further have a third space formed along the rotation axis and communicating the first space with the external space of the housing. When the rotation angle is a third angle different from the first angle and the second angle, the third space can accommodate the locking portion in a manner that allows it to move along the rotation axis. The third space may be configured such that the locking portion is restricted from rotating about the rotation axis by abutting against the locking portion with the inner surface of the housing forming the third space.

[0053] According to the above method, by rotating the handle to a third angle, the user moves the locking part along the third space in the second direction, thereby inserting the handle into the housing. Furthermore, when the locking part moves to the second space, after rotating the handle to a first or second angle to rotate the locking part, it is housed in the first space, thereby mounting the handle to the housing. Additionally, by rotating the locking part housed in the first space within the second space and moving it along the third space in the first direction, the handle can be detached from the housing.

[0054] In one or more embodiments, the grip portion may further include a force-applying component. The force-applying component may be configured to apply force to the locking portion housed in the first space in the first direction.

[0055] According to the above method, since the locking part housed in the first space is forced in the first direction by the force-applying member, it is not easy for it to move from the first space to the second space. Therefore, it is possible to prevent the locking part from moving and rotating into the second space without the user's intention. Therefore, it is possible to prevent the handle from rotating accidentally or detaching from the housing.

[0056] <Implementation Method>

[0057] <Overall Structure>

[0058] The following describes a detailed embodiment of a portable grinder, specifically a track-type grinder (hereinafter simply referred to as a grinder), 10, with reference to the accompanying drawings. The grinder 10 illustrated in this embodiment is also referred to as a finishing grinder.

[0059] like Figures 1 to 4 As shown, the grinder 10 has a drive mechanism 60, a housing 20, a grinding section 30, and a handle section 80, wherein the drive mechanism 60 has a drive shaft 66 (see reference). Figure 2 The housing 20 is used to house the drive mechanism 60; the grinding part 30 is connected to one end 661 of the drive shaft 66; the handle part 80 is mounted on the housing 20. Hereinafter, the central axis of the drive shaft 66 will also be referred to as the drive axis A1.

[0060] The grinder 10 also has a handle 22 and a battery mounting part 40, wherein the handle 22 is connected to the housing 20. The handle 22 extends in a direction intersecting the drive axis A1, with one end connected to the housing 20 and the other end configured as a free end.

[0061] In the following, the direction in which the drive shaft A1 extends is defined as the vertical direction of the grinder 10, and the side where one end 661 of the drive shaft 66 in the vertical direction is connected to the grinding section 30 is defined as the lower side, and the opposite side is defined as the upper side. Furthermore, the direction in which the handle 22 extends is defined as the front-rear direction of the grinder 10. The free end of the handle 22 in the front-rear direction is defined as the rear side, and the opposite side is defined as the front side. Moreover, the direction orthogonal to the front-rear and vertical directions is defined as the left-right direction of the grinder 10. The right side when viewed from the rear in the left-right direction is defined as the right side of the grinder 10, and the opposite side is defined as the left side of the grinder 10.

[0062] The housing 20 forms the outer contour of the grinder 10. The front end of the housing 20 is configured as a handle mounting portion 100 for mounting the handle portion 80. In this embodiment, the handle portion 80 is configured to be detachable from the handle mounting portion 100. The handle portion 80 and the handle mounting portion 100 will be described in detail later.

[0063] like Figure 2 As shown, the drive mechanism 60 includes an electric motor 61. The drive mechanism 60 is configured to drive the grinding section 30 by the rotational power of the electric motor 61. Figure 2 As shown, in this embodiment, the electric motor 61 is a brushless motor. However, the electric motor 61 can also be a brushed motor.

[0064] The electric motor 61 has a motor shaft 611 and a motor body 612, wherein the motor shaft 611 extends in a vertical direction; the motor body 612 has a stator and a rotor. The motor shaft 611 is rotatably supported on the housing 20 by bearings 62 and 63 fixed to the housing 20. Viewed vertically, the motor shaft 611 is arranged approximately at the center of the grinding section 30. The lower part of the motor shaft 611 is connected to a drive shaft 66. The drive shaft 66 is rotatably supported on the housing 20 by bearings 62 and 63 fixed to the housing 20. The rotational power of the electric motor 61 is transmitted to the grinding section 30 through the motor shaft 611 and the drive shaft 66. Furthermore, the rotational power of the electric motor 61 is reduced in speed and transmitted to the grinding section 30 by a known power transmission mechanism (not shown). In this embodiment, the rotational axis of the motor shaft 611 is aligned with the drive axis A1.

[0065] A fan 71 is mounted around the drive shaft 66, below the bearing 63. The housing of the fan 71 communicates with a dust collection nozzle 72. The dust collection nozzle 72 extends rearward from the lower and rear ends of the housing 20. A flexible hose (not shown) for connection to a dust collector (not shown) can be mounted on the dust collection nozzle 72.

[0066] like Figures 1 to 4 As shown, the grinding section 30 is located at the bottom of the grinder 10. The grinding section 30 has a grinding pad 31, a base 32, clamps 33 and 35, and operating handles 34 and 36. Viewed from above, the grinding pad 31 and the base 32 have a generally rectangular shape with the front-to-back direction as the length direction. The base 32 is positioned above the grinding pad 31, and the two are connected by bolts extending in the vertical direction.

[0067] Abrasive paper (not shown) is mounted on the abrasive pad 31 using clamps 33 and 35. Specifically, clamp 33 extends above the base 32 along the front edge of the base 32. This clamp 33 is configured to be displaced by operating the operating handle 34. Clamp 35 extends above the base 32 along the rear edge of the base 32. This clamp 35 is configured to be displaced by operating the operating handle 36. With the abrasive paper positioned on the bottom surface of the abrasive pad 31, operating the operating handle 34 clamps the front end of the abrasive paper between clamp 33 and the base 32, and operating the operating handle 36 clamps the rear end of the abrasive paper between clamp 35 and the base 32, thereby fixing the abrasive paper to the abrasive pad 31. When using the grinder 10, the bottom surface of the abrasive pad 31 functions as the abrasive surface.

[0068] like Figure 2 As shown, the grinding section 30 is connected to the drive shaft 66 via a bearing 64. Specifically, a balancer 65 is fixed around the lower end of the drive shaft 66. The balancer 65 is fixed to the drive shaft 66 by bolts that engage with threaded holes formed at the lower end of the drive shaft 66. The bearing 64 is clamped between the upper part of the balancer 65 and the base 32. The inner ring of the bearing 64 is supported by the lower part of the balancer 65. The bearing 64 is configured in an eccentric state relative to the drive shaft 66. The balancer 65 has a shape in which the center of gravity is offset in the opposite direction to the eccentric direction of the bearing 64 relative to the drive shaft 66. As a result, vibrations caused by the eccentricity of the bearing 64 relative to the drive shaft 66 can be suppressed.

[0069] The grinding part 30 is connected to the housing 20 by four feet 73. The feet 73 are configured to suppress vibrations (especially up-and-down swaying) caused by track-like movement. In this embodiment, the feet 73 are respectively disposed near the four corners of the rectangular base 32. The feet 73 have a generally cylindrical shape extending in the vertical direction. The upper end of the feet 73 is engaged with the housing 20 by O-rings. The lower end of the feet 73 is engaged with the base 32 by O-rings. The feet 73 can be tilted relative to the vertical direction while flattening these O-rings.

[0070] A battery mounting section 40 is located on the front side of the handle 22. The battery mounting section 40 is configured to allow the battery 50, which serves as the power source for the electric motor 61, to be mounted in a sliding manner in the front-to-back direction. Figure 2 As shown, with the battery 50 installed in the battery mounting part 40, the battery 50 is held above the grinding part 30 and the motor shaft 611. At this time, when viewed from above and below, the motor shaft 611 is located near the center of the battery 50.

[0071] like Figure 2 As shown, a controller 52 is housed within the housing 20. In this embodiment, the controller 52 is positioned at the rear of the motor body 612 and above the dust collection nozzle 72. The controller 52 electrically connects the terminals of the battery mounting section 40 to the electric motor 61. The controller 52 has various circuits and is configured to control the operation of the electric motor 61 by controlling the electrical power supplied from the battery 50 to the electric motor 61. Examples of such circuits include a high-temperature protection circuit, an overcurrent protection circuit, and an over-discharge protection circuit.

[0072] like Figures 1 to 3 As shown, a switch 25 is provided at the upper front end of the handle 22. The switch 25 is electrically connected to the controller 52. The switch 25 is provided for starting and stopping the electric motor 61.

[0073] <Structure of the grip and grip mounting section>

[0074] Next, refer to Figures 5 to 15 Let's explain the grip portion 80 and the grip mounting portion 100. First, let's describe the various parts of the grip portion 80. For example... Figure 5 and Figure 6As shown, the grip portion 80 includes a holding portion 81, a base 85 connected to the holding portion 81, a grip portion shaft 90 protruding from the base 85, a sleeve 94, a locking member 96, and a force-applying member 98. The grip portion 80 is configured to allow rotation around the central axis of the grip portion shaft 90 between a first angle and a second angle different from the first angle, and can be mounted on the grip mounting portion 100. In this embodiment, the first angle is a reference angle for rotation. The second angle is the angle obtained by adding 180° to the first angle (i.e., the angle obtained by rotating 180° relative to the first angle). Furthermore, the grip portion 80 is configured to be detachable from the grip mounting portion 100 when the rotation angle is a third angle different from the first and second angles. Hereinafter, the central axis of the grip portion shaft 90 will also be referred to as the rotation axis A2 of the grip portion 80. The first angle and the second angle can also be referred to as the mounting angle position when the handle is mounted on the housing 20, for example, they are also referred to as the first angle position and the second angle position.

[0075] Figure 5 and Figure 6 This indicates that the rotation axis A2 is set in the front-to-back direction, the grip portion 81 is positioned at the front, and the protruding end 91 of the handle shaft 90 is positioned at the rear of the grip portion 80. The grip portion 81 has a size and shape suitable for a user to hold. In this embodiment, when the grip portion 81 is viewed from above or below, the grip portion 81 is formed as an ellipse with a major axis in the left-to-right direction. The grip portion 81 has a first surface 811 and a second surface 812 with a different shape from the first surface 811, thereby having a rotationally asymmetrical shape relative to the rotation axis A2. The grip portion 80 is configured such that, when the grip portion 81 is viewed from the direction of the rotation axis A2, the positions of the first surface 811 and the second surface 812 in the circumferential direction around the rotation axis A2 are different when the rotation angle is a first angle and a second angle. In this embodiment, when the rotation angle is a first angle, such as Figures 1 to 3 , Figure 5 As shown, the first surface 811 is located on the upper side, and the second surface 812 is located on the lower side. When the rotation angle is the second angle, as... Figure 6 As shown, the first surface 811 is located on the lower side, and the second surface 812 is located on the upper side. The first surface 811 is both the upper part of the grip portion 81 when the rotation angle is the first angle and the lower part of the grip portion 81 when the rotation angle is the second angle. The second surface 812 is both the lower part of the grip portion 81 when the rotation angle is the first angle and the upper part of the grip portion 81 when the rotation angle is the second angle.

[0076] like Figures 1-3 , Figure 5As shown, the first surface 811 is formed to be smooth. The first surface 811 is a flat plate without any bumps or depressions. The shape of the first surface 811 is such that it is easy for an ergonomic user to grip the handle 81 with their palm from a position approximately directly opposite the first surface 811. Figure 5 The shape held on the upper side of the middle.

[0077] like Figure 6 As shown, a protrusion 813 protruding in a direction away from the rotation axis A2 is formed on the second surface 812. Figure 6 In the grip portion 81, the protrusion 813 protrudes upward. The protrusion 813 is located at the front end (first end 819) of the grip portion 81. When the handle portion 80 is mounted on the housing 20, the first end 819 is the end on the side away from the housing 20 in the direction of the rotation axis A2. When the grip portion 81 is viewed from a position directly opposite the second surface 812, the protrusion 813 is formed as a crescent shape, recessed on the housing 20 side and bulging on the side away from the housing 20 side. That is, the arc-shaped curved surface 814 on the inner side of the crescent shape is located on the housing 20 side.

[0078] A cylindrical base 85, which is connected to the grip 81, is provided on the rear side of the grip portion 81. For example... Figures 10-12 As shown, the handle shaft 90 is integrally formed with the base 85 on the inner side and the radial middle part of the grip 81 by insert molding.

[0079] The outer diameter of the base 85 is shorter than the length (major axis of the ellipse) of the grip portion 81 in the left-right direction. The base 85 has a first base 86 and a second base 87, the first base 86 being connected to the grip portion 81; the second base 87 is located behind the first base 86 and has a smaller outer diameter than the first base 86. The first base 86 and the second base 87 are connected by a connecting surface 862 orthogonal to the rotation axis A2. A handle shaft 90 protrudes from the rear end of the second base 87. The rear end face 872 of the second base 87 forms an opening for the protrusion of the handle shaft 90. The rear end face 872 is orthogonal to the rotation axis A2. Figures 10-12 As shown, the inner diameter of the second base 87 is larger than the outer diameter of the handle shaft 90. A portion of a force-applying member 98 that is inserted into the handle shaft 90 is disposed inside the second base 87.

[0080] The handle shaft 90 is a rod-shaped member protruding rearward from the base 85. A locking member 96 protrudes from the handle shaft 90. The locking member 96 is a generally rod-shaped member extending in a direction orthogonal to the rotation axis A2. The locking member 96 is provided on the front side of the protruding end 91 of the handle shaft 90. In this embodiment, when the rotation angle of the handle 80 is a first angle and a second angle, the locking member 96 is arranged in the left-right direction. In other words, when the first surface 811 is on the upper side and the second surface 812 is on the lower side, or when the second surface 812 is on the upper side and the first surface 811 is on the lower side, the extending direction of the locking member 96 (i.e., the direction protruding from the handle shaft 90) becomes the left-right direction. In this embodiment, a leaf spring is used as the locking member 96. Figure 5 and Figure 6 As shown, the locking member 96 is inserted into and fixed to the through hole 92 provided on the handle shaft 90. In this embodiment, the length of the locking member 96 is larger than the outer diameter of the sleeve 94 and smaller than the outer diameter of the second base 87.

[0081] Sleeve 94 is a cylindrical component that is inserted into the handle shaft 90. Sleeve 94 is inserted between the locking component 96 and the base 85 in the handle shaft 90. The outer diameter of sleeve 94 is smaller than the outer diameter of the second base 87.

[0082] As described above, the force-applying component 98 is inserted into the handle shaft 90. In this embodiment, the force-applying component 98 is a compression coil spring. Figures 10-12 As shown, one end of the force-applying component 98 is supported by the front end face 941 of the sleeve 94. The other end of the force-applying component 98 is supported by the support surface 871 on the inner side of the second base 87 surrounding the handle shaft 90. The support surface 871 is a surface orthogonal to the rotation axis A2 and opposite to the front end face 941 of the sleeve 94.

[0083] Next, the grip mounting portion 100 will be described. As described above, the grip mounting portion 100 is provided at the front end of the housing 20. The vertical position of the grip mounting portion 100 is approximately equal to that of the motor body portion 612. In this embodiment, the grip mounting portion 100 is configured to be able to be inserted into the hole and slot of the grip portion 80 from the opening end 101 provided at the front end of the housing 20 in the longitudinal direction. In this embodiment, the central axis A3 of the grip mounting portion 100 is aligned with the longitudinal direction. When the grip portion 80 is inserted into the grip mounting portion 100, the central axis A3 is aligned with the rotation axis A2 of the grip portion 80.

[0084] like Figure 7 and Figure 8As shown, the grip mounting portion 100 includes a base insertion portion 110, a sleeve insertion portion 120, a shaft insertion portion 150, a first space 130, a second space 140, and a third space 160. The centers of each portion in the vertical and horizontal directions are located on the central axis A3. The base insertion portion 110, the sleeve insertion portion 120, the first space 130, and the second space 140 are arranged sequentially from front to back.

[0085] The base insertion portion 110 is a hole provided at the front end of the grip mounting portion 100. The base insertion portion 110 has a shape that allows the second base portion 87 to be inserted. The inner diameter of the base insertion portion 110 is greater than or equal to the outer diameter of the second base portion 87 and smaller than the outer diameter of the first base portion 86. The rear end face 112 of the rear end of the base insertion portion 110 is defined to be orthogonal to the front-rear direction. The rear end face 112 is used to restrict the movement of the second base portion 87, into which the base insertion portion 110 is inserted, behind the rear end face 112.

[0086] The sleeve insertion portion 120 is a hole provided continuously from the base insertion portion 110 behind it. The sleeve insertion portion 120 has a shape for inserting a sleeve 94. The inner diameter of the sleeve insertion portion 120 is greater than or equal to the outer diameter of the sleeve 94 and smaller than the outer diameter of the second base 87. The rear end face 122 of the sleeve insertion portion 120 is defined to be orthogonal to the front-rear direction. The rear end face 122 serves to restrict movement of the sleeve 94 inserted into the sleeve insertion portion 120 behind the rear end face 122.

[0087] The first space 130 is provided behind the sleeve insertion portion 120. When the rotation angle is at the first angle and the second angle, the first space 130 serves to accommodate the locking member 96. Furthermore, the first space 130 is configured to restrict the rotation of the locking member 96 about the rotation axis A2. In this embodiment, the first space 130 is formed as a groove that allows the locking member 96 to be arranged in the left-right direction. Figure 8 As shown, the front end face 131 of the inner surface of the housing 20 of the first space 130 abuts against the locking member 96 disposed in the first space 130, thereby restricting the forward movement of the locking member 96. Figure 7 and Figure 15 As shown, the upper end face 133 and the lower end face 135 of the inner surface of the housing 20 of the first space 130 abut against the locking member 96 disposed in the first space 130, thereby restricting the locking member 96 from rotating about the rotation axis A2.

[0088] The second space 140 is located behind and communicates with the first space 130. The second space 140 has a shape that allows the locking member 96 to rotate about the rotation axis A2. The second space 140 is configured to have a hole with an inner diameter that allows the locking member 96 to rotate about the rotation axis A2 (central axis A3). When the locking member 96 is arranged in the left-right direction, it can move in the front-back direction within the second space 140 and the first space 130.

[0089] The shaft insertion portion 150 is a hole for inserting the handle shaft 90. The shaft insertion portion 150 communicates with the sleeve insertion portion 120 behind it. The shaft insertion portion 150 extends in the front-rear direction to the rear of the second space 140. The inner diameter of the shaft insertion portion 150 is smaller than the length (long shaft) of the locking member 96. The rear portion of the second space 140 in the front-rear direction of the shaft insertion portion 150 is formed such that the portion of the handle shaft 90 closer to the protruding end 91 of the locking member 96 can be inserted into it.

[0090] The third space 160 has a shape that allows the locking member 96 to move in the front-to-back direction when the rotation angle of the handle portion 80 is a third angle. In this embodiment, the third space 160 is formed such that the base insertion portion 110 is continuous with the second space 140 in the front-to-back direction. Therefore, the third space 160 is continuous with the external space of the housing 20 through the base insertion portion 110. The length of the third space 160 in the vertical direction is such that the locking member 96 can be arranged in the vertical direction. Therefore, the third space 160 allows the locking member 96 arranged in the vertical direction to move between the opening end 101 and the second space 140. Figure 8 and Figure 15 As shown, the left and right end faces 161 of the inner surface of the housing 20 of the third space 160 abut against the locking member 96 arranged in the vertical direction, thereby restricting the locking member 96 from rotating about the rotation axis A2.

[0091] Below, we will mainly use Figures 10-15 This describes a method for mounting the grip portion 80 to the grip mounting portion 100, a method for switching the rotation angle of the grip portion 80, and a method for removing the grip portion 80 from the grip mounting portion 100.

[0092] <Method for attaching the grip to the grip mounting section>

[0093] (1) First, the user rotates the handle portion 80 to a third angle. The third angle is the angle at which the locking member 96 can be inserted into the third space 160. In this embodiment, the third angle is the angle after rotating 90° from the first angle. The third angle is also the angle at which the protruding direction of the locking member 96 is vertical. Therefore, by rotating the handle portion 80 about the rotation axis A2 with the first surface 811 on the right and the second surface 812 on the left, the user can insert the handle portion 80 into the handle mounting portion 100. Alternatively, the user can rotate the handle portion 80 with the first surface 811 on the left and the second surface 812 on the right.

[0094] (2) Next, the user inserts the handle shaft 90 into the base insertion part 110 from the opening end 101 of the handle mounting part 100. When the user pushes the handle part 80 (grip part 81) backward, the locking member 96 moves from front to rear along the third space 160, and the rear end face 942 of the sleeve 94 abuts against the rear end face 122 of the sleeve insertion part 120.

[0095] (3) The user overcomes the force exerted by the force-applying component 98 and pushes the gripping part 81 further backward. Thus, as... Figure 10 As shown, the rear end face 872 of the second base 87 abuts against the rear end face 112 of the base insertion portion 110. The handle shaft 90 slides rearward inside the sleeve 94, and the protruding end 91 of the handle shaft 90 reaches the rear end of the shaft insertion portion 150. Then, the locking member 96 reaches the second space 140. As a result, the locking member 96 is in a state in the second space 140 that can rotate about the rotation axis A2.

[0096] (4) Next, as Figure 11 As shown, the user pushes the grip 81 backward while simultaneously rotating the handle 80 by the first angle. That is, the user rotates the handle 80 with the first surface 811 positioned upward. This causes the locking member 96 to protrude in the left-right direction, allowing it to move from the second space 140 to the first space 130. In other words, when the user rotates the handle 80 with the first surface 811 positioned upward to release the backward push, the locking member 96 is forced forward by the force-applying member 98, moving from the second space 140 to the first space 130. At this time, as... Figure 13 As shown, the front end face 131 of the first space 130 abuts against the locking member 96, thereby restricting the forward movement of the locking member 96. Additionally, as... Figure 15As shown, the upper end face 133 and lower end face 135 of the first space 130 abut against the locking member 96, thereby restricting the rotation of the locking member 96 about the rotation axis A2. Thus, when the locking member 96 is housed in the first space 130, the forward movement of the locking member 96 and the rotation of the locking member 96 about the rotation axis A2 are restricted. In other words, the forward movement of the grip portion 80 in the direction of disengagement from the grip mounting portion 100 and its rotation about the rotation axis A2 are restricted. At this time, since the force-applying member 98 applies a force forward to the grip portion shaft 90 and the locking member 96 through the support surface 871 of the second base 87, the locking member 96 housed in the first space 130 will not move towards the second space 140.

[0097] <Method for switching the rotation angle of the grip section 80>

[0098] (5) Next, as Figure 12 and Figure 13 The diagram illustrates a method for switching the rotation angle of the grip 80 from the state where the grip 80 is mounted on the grip mounting portion 100. When the user... Figure 12 and Figure 13 As shown in the diagram, when the gripping part 81 is pushed backward against the force exerted by the force-applying part 98, the locking part 96 reaches the second space 140 (see reference). Figure 11 As a result, similar to (3) above, the locking component 96 becomes capable of rotating about the rotation axis A2.

[0099] (6) Similar to (4) above, the user pushes the grip 81 backward while rotating the handle 80 by a second angle (180°). That is, the user rotates the handle 80 180° with the second surface 812 on the upper side. Thus, similar to (4) above, the locking member 96 becomes capable of moving from the second space 140 to the first space 130. That is, when the user rotates the handle 80 with the second surface 812 on the upper side to release the backward push of the handle 80, the locking member 96 moves from the second space 140 to the first space 130. At this time, the front end surface 131 of the first space 130 restricts the forward movement of the locking member 96 (see reference). Figure 14 Additionally, the upper end face 133 and lower end face 135 of the first space 130 restrict the locking member 96 from rotating about the rotation axis A2. In this way, the user can switch the rotation angle of the handle 80.

[0100] In addition, in (4) above, the user rotates the handle 80 to the second angle (180°), and in (6) above, the user rotates the handle 80 to the first angle (0°).

[0101] How to remove the grip from the grip mounting part>

[0102] (7) Next, the method for removing the grip portion 80 from the grip mounting portion 100 will be described. For example, when the user removes the grip portion 80 from the grip mounting portion 100... Figure 12 When the state shown begins to overcome the force of the force-applying component 98 and pushes further backward into the holding part 81, the locking component 96 reaches the second space 140 (see reference). Figure 11 As a result, similar to (3) and (5) above, the locking component 96 becomes capable of rotating about the rotation axis A2.

[0103] (8) While pushing the grip 81 backward, the user rotates the handle 80 by a third angle (90°). That is, the user rotates the handle 80 with the first surface 811 on the right and the second surface 812 on the left. Alternatively, the user rotates the handle 80 with the first surface 811 on the left and the second surface 812 on the right. The protruding direction of the locking member 96 then becomes vertical, allowing the locking member 96 to move from the second space 140 along the third space 160 to the base insertion portion 110, and thus to the opening end 101. In this way, the user can detach the handle 80 from the handle mounting portion 100.

[0104] <Effect>

[0105] According to the polisher 10 described above, the handle 80 has a gripping part 81, which has a first surface 811 and a second surface 812 with a different shape from the first surface 811, thus forming a rotationally asymmetrical shape relative to the rotation axis A2. Furthermore, the handle 80 is configured to be mounted on the housing 20 such that the rotation angle around the rotation axis A2 can be switched between a first angle and a second angle different from the first angle. When the gripping part 81 is viewed along the rotation axis A2, the positions of the first surface 811 and the second surface 812 in the circumferential direction around the rotation axis A2 are configured differently when the rotation angle is the first angle and the second angle. Therefore, by switching the rotation angle of the handle 80 between the first angle and the second angle, the user can change the displayed position of the first surface 811 and the second surface 812. Thus, the mounting posture of the handle 80 (gripping part 81) relative to the housing 20 can be switched according to the operating mode. As a result, the operability of portable grinders can be improved.

[0106] When the rotation angle is the first angle, the handle portion 80 is configured such that the first surface 811 is on the upper side and the second surface 812 is on the lower side. Conversely, when the rotation angle is the second angle, the handle portion 80 is configured such that the second surface 812 is on the upper side and the first surface 811 is on the lower side. Therefore, by reversing the handle portion 80 around the rotation axis A2 (rotating 180°), the surface shape displayed on the upper and lower sides can be switched from the first surface 811 to the second surface 812 or vice versa. Thus, the user can intuitively switch between the surface shapes displayed on the upper and lower sides.

[0107] Furthermore, a protrusion 813 is formed on the second surface 812, and the protrusion 813 protrudes from its first end 819 on the side away from the housing 20 in a direction away from the axis of rotation A2. Therefore, the user can place their fingers on the protrusion 813 on the second surface 812 to hold the gripping part 81. Thus, compared with a structure without the protrusion 813, grinding operations can be performed more easily.

[0108] Furthermore, when the handle portion 80 is rotated at the first angle, the second surface 812 is located on the lower side, and the protrusion 813 of the second surface 812 protrudes downward, thus allowing the user to place their fingers on the protrusion 813. This further improves the operability of the grinder 10.

[0109] When the grip portion 81 is viewed from a position directly opposite the second surface 812, the protrusion 813 is formed in a crescent shape that is recessed towards the housing 20 and bulges away from the housing 20. Therefore, when the second surface 812 is on the upper side, the user can perform the grinding operation by pressing the edge of the palm along the protrusion 813 towards the second surface 812. Thus, the gripping method of the handle portion 80 can be diversified. In addition, in the finishing stage of the grinding operation, the force of pushing the grinder 10 downward is sometimes reduced compared to the initial stage. In such cases, the user can apply appropriate force downward along the arc-shaped curved surface 814 of the protrusion 813 while moving the edge of the palm in the desired direction, thereby performing the grinding operation while moving the grinder 10 in the desired direction.

[0110] In addition, the first surface 811 is formed smoothly, and the grip portion 81 is formed into an ellipse with a major axis in the direction intersecting the rotation axis A2. Therefore, the user can easily grip the grip portion 81, for example, by wrapping the first surface 811 with the palm of their hand.

[0111] Furthermore, when the rotation angle of the handle portion 80 is the first angle, the first surface 811 is located on the upper side, and the first surface 811 is smoothly formed, so that the user can easily push the grinder 10 downward to perform grinding.

[0112] Furthermore, in the grinder 10, a handle 80 is located at the front end of the housing 20, and a handle 22 extending in the front-to-back direction is located at the rear end of the housing 20. Therefore, the user can hold the handle 22 with one hand and grasp the grip 81 of the handle 80 with the other hand, while simultaneously pushing the grinder 10 downwards to perform grinding operations. Additionally, by moving the handle 80 in the desired direction, the grinder 10 can be moved to perform grinding operations.

[0113] Furthermore, the housing 20 has a handle mounting portion 100, which has a first space 130 and a second space 140. The first space 130 is configured to accommodate a locking member 96 such that the rotation angle of the handle portion 80 is either a first angle or a second angle, and to restrict the rotation of the locking member 96 about the rotation axis A2. The second space 140 is configured to communicate with the first space 130 and is located behind the first space 130, allowing the locking member 96 to rotate. Therefore, by moving the locking member 96 housed in the first space 130 rearward and rotating it within the second space 140, the user can switch the rotation angle of the handle portion 80 from the first angle to the second angle or from the second angle to the first angle and fix it to the housing 20.

[0114] Furthermore, the grip mounting portion 100 has a third space 160, which allows the locking member 96 to move from the opening end 101 to the second space 140 in the front-back direction. When the rotation angle of the grip portion 80 is a third angle different from the first and second angles, the third space 160 is configured to allow the locking member 96 to move in the front-back direction. Therefore, by rotating the grip portion 80 to the third angle, inserting the grip portion 80 from the opening end 101 of the grip mounting portion 100, and rotating the grip portion 80 to the first or second angle within the second space 140, the user can accommodate the locking member 96 in the first space 130, thereby mounting the grip portion 80 to the grip mounting portion 100. Furthermore, by rotating the locking member 96 housed in the first space 130 within the second space 140, it can be moved forward along the third space 160, thereby allowing the grip portion 80 to be detached from the grip mounting portion 100.

[0115] According to the grinder 10, the handle 80 can be detached from the handle mounting part 100 by utilizing the structure of the handle part 80 and the housing 20. Therefore, no tool is needed to install the handle part 80 to the housing 20, thus improving the convenience of the grinder 10.

[0116] Furthermore, since the handle portion 80 is installed in the handle mounting portion 100, which is configured with a hole and a groove, within the housing 20, the user's hand will not come into contact with the engaging portion between the handle portion 80 and the housing 20 during grinding operations. This prevents the handle portion 80 from accidentally detaching from the housing 20.

[0117] Furthermore, by moving the locking member 96 of the grip portion 80 along the third space 160 to the second space 140, and rotating the locking member 96 to a first angle or a second angle within the second space 140, the user can receive (lock) the grip portion 80 in the first space 130, thereby mounting the grip portion 80 to the housing 20. Alternatively, by moving the locking member 96, which is locked in the first space 130, towards the second space 140 and rotating it to a third angle, the user can move it along the third space 160 to the opening end 101, thereby detaching the grip portion 80 from the grip mounting portion 100. Therefore, according to this structure, for example, compared to the prior art structure where a groove formed in the circumferential direction of the shaft is screwed into a threaded hole in the housing to fix the grip portion to the housing, the grip portion 80 can be easily installed and removed.

[0118] <Correspondence Relationship>

[0119] The following shows the correspondence between the constituent elements of the above embodiments and the constituent elements of the present invention. However, the constituent elements of the embodiments are merely examples and do not limit the constituent elements of the present invention.

[0120] Grinding machine 10 is an example of a "portable grinder".

[0121] The grinding section 30 is an example of a "grinding section".

[0122] Drive shaft 66 is an example of a "drive shaft".

[0123] One end 661 of the drive shaft 66 is an example of "one end of the drive shaft".

[0124] Drive mechanism 60 and electric motor 61 are examples of "drive mechanisms".

[0125] The housing 20 and the handle mounting part 100 are examples of a "housing".

[0126] The grip portion 80 is an example of a "grip portion".

[0127] Surface 811 and Surface 812 are examples of “first surface” and “second surface”, respectively.

[0128] Rotation axis A2 is an example of a "rotation axis".

[0129] The control section 81 is an example of a "control section".

[0130] The first end 819 is an example of an "end on the side away from the shell".

[0131] Convex part 813 is an example of a "convex part".

[0132] The handle shaft 90 is an example of a "shaft".

[0133] The locking component 96 is an example of a "locking part".

[0134] Force-applying component 98 is an example of a "force-applying component".

[0135] Space 130 and Space 240 are examples of "Space 1" and "Space 2", respectively.

[0136] The upper end face 133, the lower end face 135, and the front end face 131 are examples of "the inner surfaces of the shell forming the first space".

[0137] The front end face 131 is an example of the "inner surface on the first direction side" of the "inner surface of the shell forming the first space".

[0138] Space 3, 160, is an example of "Space 3".

[0139] The end face 161 of the third space 160 is an example of "the inner surface of the shell forming the third space".

[0140] The rear is an example of "direction 1", and the front is an example of "direction 2".

[0141] <Other Implementation Methods>

[0142] In the above embodiments, the first angle is the reference angle (0°), the second angle is the angle after rotating 180° from the first angle (180°), and the third angle is the angle after rotating 90° from the first angle. These are examples; the first angle, the second angle, and the third angle can be other angles besides those in the above embodiments.

[0143] Furthermore, in the above embodiment, at the first angle, the first surface 811 is located on the upper side, and the second surface 812 is located on the lower side. Alternatively, at the first angle, the first surface 811 may be located in a location other than the upper side in the circumferential direction, such as the right or left side. Similarly, the second surface 812 may be located in a location other than the lower side.

[0144] The second angle can include multiple angles. For example, the first space 130 can be configured to accommodate the locking component 96 at multiple angles such as 30°, 60°, and 180°, and is not limited to the left and right directions.

[0145] In the above embodiment, the handle mounting portion 100 may not have the third space 160, and the handle portion 80 may be configured to be non-removable from the housing. In this case, the grinder 10 can be configured such that the locking member 96 is pre-positioned between the first space 130 and the second space 140.

[0146] In the above embodiment, the drive axis A1 is aligned with the rotation axis of the motor shaft 611. Alternatively, the drive axis A1 may not be aligned with the rotation axis of the motor shaft 611. For example, the motor shaft 611 may be arranged in a front-rear direction. The drive mechanism 60 may have a main shaft to which the rotational power of the motor shaft 611 can be transmitted. In this case, the drive axis A1 may be the central axis (output axis) of the main shaft.

[0147] In the above embodiments, the handle portion 80 can be mounted in other locations, not limited to the front end of the housing 20. For example, the handle portion 80 can be mounted on the left or right wall of the housing 20. Alternatively, the handle mounting portion 100 can be configured as a clamp-like structure that can be mounted at any location around the side wall of the housing 20, thereby fixing the handle portion 80 to any location around the side wall of the housing 20. In this case, the clamp-like handle mounting portion can be considered as the housing of a portable grinder.

[0148] The grinder 10 can be driven by receiving power from an external AC power source via a power cord, and is not limited to a rechargeable battery 50.

[0149] The above-described embodiments can be applied to random orbit sanders, polishers, etc., but are not limited to orbit sanders.

[0150] This invention is not limited to the embodiments described above, and can be implemented with various structures without departing from its spirit. For example, in order to solve part or all of the above-described technical problems or to achieve part or all of the above-described effects, technical features in embodiments corresponding to the technical features in the various methods described in the invention summary can be appropriately replaced or combined. Furthermore, if a technical feature is not required to be described in this description, it can be appropriately omitted.

Claims

1. A portable grinder, characterized in that, It has a grinding part, a drive mechanism, a housing, and a handle, wherein, The driving mechanism is used to drive the grinding unit; The housing is used to house the drive mechanism; The handle portion has a rotation axis and is rotatable about the rotation axis. The handle portion has a gripping portion, which has a first surface and a second surface with a different shape from the first surface, thereby forming a rotationally asymmetrical shape relative to the rotation axis. The handle portion is configured to be mounted on the housing in a manner that allows switching the rotation angle about the rotation axis to a first angle and a second angle different from the first angle. When the gripping part is viewed along the rotation axis, the positions of the first surface and the second surface in the circumferential direction around the rotation axis are different when the rotation angle is the first angle and the second angle, respectively. The handle portion has a shaft and a locking portion, the shaft protruding from the grip portion and extending along the axis of rotation; the locking portion protrudes from the axial direction intersecting the axis of rotation. The shell has a first space and a second space. When the direction in which the handle portion moves away from the housing along the rotation axis is defined as the first direction, and the direction opposite to the first direction is defined as the second direction,... The first space is a space that can accommodate the locking part when the rotation angle is the first angle and the second angle, and the locking part is restricted from rotating about the rotation axis by the inner surface of the housing forming the first space abutting against the locking part; The second space is disposed on the second direction side of the first space and communicates with the first space, and has a shape that allows the locking part to rotate about the rotation axis.

2. The portable grinder according to claim 1, characterized in that, The drive mechanism has a drive shaft at one end connected to the grinding part. The direction of extension of the drive shaft is defined as the up-down direction. The side of the drive shaft that connects to the grinding part in the up-down direction is defined as the lower side, and the opposite side of the lower side is defined as the upper side. The handle portion is configured such that, when the rotation angle is the first angle, the first surface is located on the upper side of the grip portion, and the second surface is located on the lower side of the grip portion.

3. The portable grinder according to claim 1 or 2, characterized in that, The drive mechanism has a drive shaft at one end connected to the grinding part. The direction of extension of the drive shaft is defined as the up-down direction. The side of the drive shaft that connects to the grinding part in the up-down direction is defined as the lower side, and the opposite side of the lower side is defined as the upper side. The handle portion is configured such that, when the rotation angle is the second angle, the second surface is located on the upper side of the grip portion, and the first surface is located on the lower side of the grip portion.

4. The portable grinder according to claim 1 or 2, characterized in that, A protrusion is formed on the second surface, and the end of the protrusion on the side away from the housing in the direction of the rotation axis protrudes in a direction away from the rotation axis.

5. The portable grinder according to claim 4, characterized in that, When the gripping portion is viewed from a position directly opposite the second surface, the protrusion is formed in a crescent shape, recessed on the housing side in the direction of the rotation axis, and bulging out on the side away from the housing.

6. The portable grinder according to claim 1 or 2, characterized in that, The first surface is formed smoothly. When viewed from a position directly opposite the first surface, the gripping portion is formed as an ellipse having a major axis in a direction intersecting the axis of rotation.

7. The portable grinder according to claim 1 or 2, characterized in that, The first space further restricts the movement of the locking portion from the first space toward the first direction by abutting the inner surface of the inner surface of the housing forming the first space on the first direction side with the locking portion housed in the first space.

8. The portable grinder according to claim 7, characterized in that, The housing also has a third space, which is formed along the rotation axis and communicates the second space with the outer space of the housing. When the rotation angle of the grip is a third angle that is different from the first angle and the second angle, the locking part is accommodated in a manner that allows it to move along the rotation axis, and the locking part is restricted from rotating about the rotation axis by the inner surface of the housing forming the third space abutting against the locking part.

9. The portable grinder according to claim 7, characterized in that, The handle also has a force-applying component. The force-applying component applies force to the locking portion housed in the first space in the first direction.

10. The portable grinder according to claim 8, characterized in that, The handle also has a force-applying component. The force-applying component applies force to the locking portion housed in the first space in the first direction.

11. A portable grinder, characterized in that, It has a grinding part, a drive mechanism, a housing, and a handle, wherein, The driving mechanism is used to drive the grinding unit; The housing is used to house the drive mechanism; The handle portion is rotatable about a rotation axis, and can be mounted on the housing at least by a first angle, rotating about the rotation axis. The handle portion has a gripping portion, a shaft, and a locking portion; the shaft protrudes from the gripping portion and extends along the rotation axis; the locking portion protrudes from the axial direction intersecting the rotation axis. The shell has a first space, a second space, and a third space. When the direction in which the handle portion moves away from the housing along the rotation axis is defined as the first direction, and the direction opposite to the first direction is defined as the second direction, The first space is a space that can accommodate the locking part when the rotation angle is the first angle, and the locking part is restricted from rotating about the rotation axis and moving from the first space to the first direction by the inner surface of the housing forming the first space abutting against the locking part; The second space is disposed on the second direction side of the first space and communicates with the first space, and has a shape that allows the locking part to rotate about the rotation axis; The third space is formed along the rotation axis and connects the second space with the outer space of the housing. It accommodates the locking part in a manner that allows it to move along the rotation axis only when the rotation angle is a third angle different from the first angle. The locking part is restricted from rotating around the rotation axis by abutting against the locking part by the inner surface of the housing forming the third space.

Images