Belt sander

Abstract

To provide a belt sander with a technique that enhances protection of a battery.SOLUTION: A belt sander comprises: a motor which is driven by electric power supplied from a battery; a battery installation part which can install the battery; a belt driving part which includes a drive roller rotated by driving force of the motor, a driven roller, and a belt that is bridged across the drive roller and the driven roller and includes a polished surface to polish a processing object; a housing with a motor storage part that accommodates the motor; and a handle which is arranged to surround at least a part of the battery installed at the battery installation part.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a belt sander.

Background Art

[0002] There is known a belt sander that polishes an object to be processed by rotating an endless sanding belt by a motor driven by electric power supplied from a battery. For example, Patent Document 1 discloses a belt sander including a front handle having an arm connected to one side surface of a housing and a gripping portion connected to the arm. The front handle is disposed in the vicinity of the battery, and for example, the impact on the battery when the belt sander falls may be suppressed by the front handle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional technology, the protection of the battery is not sufficient, and an enhancement of the protection of the battery is required.

Means for Solving the Problems

[0005] According to a first aspect of the present disclosure, a belt sander is provided. The belt sander includes a motor driven by electric power supplied from a battery, a battery mounting portion to which the battery is detachably attached, a drive roller rotated by the driving force of the motor, a driven roller, and a belt drive portion including a belt that is stretched between the drive roller and the driven roller and functions as a polishing surface for polishing an object to be processed, a housing having a motor housing portion for housing the motor, and a handle disposed so as to surround at least a part of the battery mounted on the battery mounting portion.

[0006] According to the belt sander of the above aspect, the handle surrounds at least a part of the battery mounted on the battery mounting portion. Therefore, the battery can be protected from external impacts such as an impact on the battery when the belt sander falls, and the protection of the battery can be strengthened.

[0007] According to a second aspect of the present disclosure, a belt sander is provided. The belt sander includes a motor driven by electric power supplied from a battery, a battery mounting portion to which the battery is detachably attached, a drive roller rotated by the driving force of the motor, a driven roller, and a belt drive portion including a belt that is stretched between the drive roller and the driven roller and functions as a polishing surface for polishing an object to be processed, a bottom portion on which the belt drive portion is disposed, an upper surface portion located on the side opposite to the bottom portion, a first side surface portion connecting the bottom portion and the upper surface portion, a second side surface portion on the side opposite to the first side surface portion, and a housing having a motor housing portion for housing the motor, a first extension portion connected to the first side surface portion, a second extension portion connected to the second side surface portion, and a handle having a gripping portion connecting the first extension portion and the second extension portion, a drive transmission portion provided on the first side surface portion for transmitting the driving force of the motor to the drive roller. The handle is disposed so as to surround at least a part of the battery mounted on the battery mounting portion. The cross-sectional width of the second extension portion is narrower than the cross-sectional width of the first extension portion.

[0008] According to the belt sander of the above aspect, the cross-sectional width of the second extension part is narrower than the cross-sectional width of the first extension part. For example, even when performing a polishing operation on a workpiece having a processing surface and a wall surface adjacent to the processing surface, it becomes easy to bring the second side surface portion closer to the wall surface while polishing the processing surface. Therefore, it becomes easy to perform the polishing operation near the wall surface.

[0009] According to a third aspect of the present disclosure, a belt sander is provided. This belt sander includes a motor driven by electric power supplied from a battery, a battery mounting portion to which the battery is detachably attached, a first handle, a second handle disposed so as to surround at least a part of the battery mounted on the battery mounting portion, a drive roller rotated by the driving force of the motor, a driven roller, and a belt that is stretched between the drive roller and the driven roller and functions as a polishing surface for polishing a workpiece, a motor housing portion that houses the motor, a bottom portion on which the belt drive portion is disposed, an upper surface portion opposite to the bottom portion, and a housing having a back surface portion opposite to the second handle with the motor housing portion interposed therebetween. The first handle has an upper base portion connected to a position on the back surface portion close to the upper surface portion, a lower base portion connected to a position on the back surface portion close to the belt drive portion, and a first gripping portion that extends and connects the upper base portion and the lower base portion. The extending direction of the first gripping portion is inclined at a predetermined inclination angle with respect to the surface direction of the polishing surface such that the upper side of the first gripping portion is closer to the back surface portion than the lower side of the first gripping portion in a side view of the belt sander. The inclination angle is 30 degrees or more and 50 degrees or less.

[0010] According to the belt sander of the above aspect, it becomes easy for the user to apply a force for pressing the belt sander against the polishing surface. Therefore, the user can easily perform both an operation of gripping the first handle and pressing the polishing surface against the workpiece and an operation of moving the belt sander to change the processing position.

[0011] According to a fourth aspect of the present disclosure, a belt sander is provided. The belt sander includes a motor driven by electric power supplied from a battery, a battery mounting portion to which the battery is detachably attached, a first handle, a second handle disposed so as to surround at least a part of the battery mounted on the battery mounting portion, a drive roller rotated by a driving force of the motor, a driven roller, and a belt drive unit including a belt stretched between the drive roller and the driven roller and functioning as a polishing surface for polishing an object to be processed, a motor housing portion for housing the motor, a bottom portion on which the belt drive unit is disposed, an upper surface portion opposite to the bottom portion, and a housing having a back surface portion opposite to the second handle with the motor housing portion interposed therebetween. The first handle includes an upper base portion connected to a position on the back surface portion close to the upper surface portion, a lower base portion connected to a position on the back surface portion close to the belt drive unit, a first grip portion extending and connecting the upper base portion and the lower base portion, and a switch trigger provided at a position of the first grip portion facing the back surface portion for switching on and off the motor. In a side view of the belt sander, a normal line with respect to the extending direction of the first grip portion and passing through a position on the first grip portion opposite to the switch trigger passes between the rotation axis of the drive roller and the rotation axis of the driven roller.

[0012] According to the belt sander of the above aspect, it becomes easier for the user to apply a force for pressing the belt sander against the polishing surface. Therefore, the user can easily perform both an operation of gripping the first handle and pressing the polishing surface against the object to be processed and an operation of moving the belt sander to change the processing position.

Brief Description of the Drawings

[0013]

Figure 1

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Figure 18

Mode for Carrying Out the Invention

[0014] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the drawings. This detailed description is merely intended to show those skilled in the art the details for implementing preferred examples of the present invention, and is not intended to limit the scope of the present invention. Further, the additional features and inventions disclosed below can be used separately or together with other features and inventions to provide further improved devices, methods for manufacturing them, and methods for using them.

[0015] Also, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense, and are described only for the purpose of explaining representative specific examples of the present invention in particular. Further, the various features of the above and below representative specific examples, as well as the various features described in the independent and dependent claims, do not have to be combined as described in the specific examples here or in the order in which they are listed in providing additional and useful embodiments of the present invention.

[0016] All features described in this specification and / or the claims are intended to be disclosed separately and independently of each other, as limitations on the initial disclosure and the claimed specific matters, apart from the configurations of the features described in the embodiments and / or the claims. Further, all descriptions regarding numerical ranges and groups or populations are made with the intention of disclosing intermediate configurations as limitations on the initial disclosure and the claimed specific matters.

[0017] In one or more embodiments, the housing may further include a bottom portion where the belt drive portion is disposed, an upper surface portion opposite to the bottom portion, a first side surface portion located between the bottom portion and the upper surface portion, and a second side surface portion opposite to the first side surface portion. The handle may include a first extension portion connected to the first side surface portion, a second extension portion connected to the second side surface portion, and a gripping portion connecting the first extension portion and the second extension portion. The first extension portion and the second extension portion may overlap at least a part of the battery mounted on the battery mounting portion in a side view of the belt sander. According to the belt sander of this embodiment, the protection of the side surface of the battery can be strengthened by using the first extension portion and the second extension portion of the handle.

[0018] In one or more embodiments, the handle may further include a first connecting portion for rotatably connecting the first extension portion to the first side surface portion, and a second connecting portion for rotatably connecting the second extension portion to the second side surface portion. The handle may rotate within a predetermined range of rotation angles. The first extension portion and the second extension portion may overlap at least a part of the battery mounted on the battery mounting portion in a side view of the belt sander, regardless of the rotational position of the first handle within the range. According to the belt sander of this embodiment, by adjusting the rotational position of the handle, the protection of the position desired by the user among the batteries can be strengthened.

[0019] In one or more embodiments, the handle may further include a detaching and attaching operation portion that moves the first connecting portion in a first direction toward the first side surface along the rotation axis of the handle and in a second direction away from the first side surface. The detaching and attaching operation portion moves in the first direction to sandwich the first connecting portion between the detaching and attaching operation portion and the first side surface to suppress rotation of the handle, and moves in the second direction to separate the first connecting portion from the first side surface to enable rotation of the handle, and the state of the handle may be switchable between a rotation suppression state and a rotation state. According to the belt sander of this embodiment, the rotational position of the handle can be changed by a simple operation using the detaching and attaching operation portion.

[0020] In one or more embodiments, further, a shaft portion inserted through the first connecting portion and the second connecting portion and defining the rotation axis of the handle may be provided. The first connecting portion may include a connecting engagement portion having a convex shape or a concave shape. The shaft portion may include a shaft engagement portion having a concave shape or a convex shape corresponding to the connecting engagement portion. The detaching and attaching operation portion may be fixed to an end of the shaft portion and be movable in the first direction and the second direction. When the shaft portion moves in the second direction and reaches a predetermined restriction position, further movement of the shaft portion in the second direction may be restricted due to the engagement between the shaft engagement portion and the connecting engagement portion. According to the belt sander of this embodiment, when the shaft portion moves in the second direction, it is possible to suppress or prevent the shaft portion from falling off the first handle or the housing.

[0021] In one or more embodiments, the connecting engagement portion may be a claw portion having a convex shape protruding toward the shaft portion on a wall surface of a through hole through which the shaft portion is inserted in the first connecting portion. The shaft engagement portion may be a shaft concave portion having a concave shape with a smaller shaft diameter than other portions of the shaft portion. When the claw portion is locked to the shaft concave portion at the restriction position, movement of the shaft portion in the second direction may be restricted. According to the belt sander of this form, a mechanism for preventing the shaft portion from falling off can be formed by changing the shapes of the first connecting portion and the shaft portion without adding new parts. Therefore, an increase in the number of parts of the belt sander can be suppressed or prevented.

[0022] In one or more embodiments, the first side surface portion may include a restraining portion capable of accommodating the claw portion engaged with the shaft recess at the restricting position in a state of contacting the outer surface of the claw portion. According to the belt sander of this form, it is possible to more reliably suppress or prevent the shaft portion from falling off from the handle and the housing.

[0023] In one or more embodiments, the first connecting portion may have a concave shape at a position facing the first side surface portion and include a countersunk portion functioning as the connecting engagement portion. The shaft portion may have a convex shape with a larger shaft diameter than other portions of the shaft portion and include a shaft convex portion functioning as the shaft engagement portion. When the countersunk portion engages with the shaft convex portion at the restricting position, movement of the shaft portion in the second direction may be restricted. According to the belt sander of this form, when the shaft portion moves in the second direction, it is possible to suppress or prevent the shaft portion from falling off from the handle or the housing.

[0024] In one or more embodiments, the shaft convex portion may be an O-ring fixed to the shaft portion. According to the belt sander of this form, a mechanism for preventing the shaft portion from falling off can be formed using simple parts.

[0025] In one or more embodiments, one of the first extension portion and the second extension portion and the gripping portion may be integrally formed using synthetic resin. The other extension portion different from the one extension portion may be formed using metal. The other extension portion may include a first portion extending from a connection position with the housing and a second portion bent from the first portion toward the gripping portion. The second portion may be disposed inside the gripping portion. According to the belt sander of this form, by the structure that makes a part of the second extension overlap with the gripping part, the rigidity of the handle can be improved and the strength of the handle can be improved.

[0026] In one or more embodiments, further, a drive transmission part for transmitting the driving force of the motor to the drive roller may be provided. The first extension may be formed using a synthetic resin. The second extension may be formed using a metal. The drive transmission part may be provided on the first side surface part. According to the belt sander of this form, by disposing the metal second extension, which is more likely to be heavier than the first extension, on the side opposite to the drive transmission part, which is likely to be heavy, it becomes easy to equalize the weight of the entire belt sander.

[0027] In one or more embodiments, at least a part of the gripping part may be fixable at a position flush with the upper surface part by the rotation of the handle. According to the belt sander of this form, when performing an operation with the polishing surface of the belt sander facing upward, the belt sander can be supported by at least a part of the gripping part and the upper end part. Therefore, the workability of the belt sander can be improved compared to the case of supporting the belt sander only by the upper end part.

[0028] In one or more embodiments, further, when the handle surrounding at least a part of the battery is a second handle, an upper base connected to a position near the upper surface portion of the back surface portion of the housing located on the side opposite to the second handle across the motor housing portion, a lower base connected to a position near the belt drive portion of the back surface portion, and a first handle having a first grip portion that extends and connects the upper base and the lower base may be provided. The extending direction of the second grip portion may be inclined at a predetermined inclination angle with respect to the surface direction of the polishing surface such that, in a side view of the belt sander, the upper side of the second grip portion is closer to the back surface portion than the lower side of the second grip portion. The inclination angle may be 30 degrees or more and 50 degrees or less. According to the belt sander of this embodiment, a user can easily perform both an operation of gripping the first handle and pressing the polishing surface against an object to be processed, and an operation of moving the belt sander to change the processing position.

[0029] In one or more embodiments, the first handle may further include a switch trigger provided at a position of the first grip portion facing the back surface portion for switching on and off the motor. The switch trigger may include a trigger body and a trigger surface against which a user places a finger when operating the trigger body. The extending direction may be defined by a perpendicular bisector of a straight line connecting an upper end portion and a lower end portion of the trigger surface that are exposed to the outside of the belt sander when the switch trigger is not operated in a side view of the belt sander, and a tangent line of the first handle at an intersection where the perpendicular bisector intersects the back surface of the first handle.

[0030] In one or more embodiments, the first handle may further include a switch trigger provided at a position facing the back surface portion of the gripping portion. The switch trigger may include a trigger body having a trigger bottom portion having an arc shape in a side view of the belt sander, and a trigger surface against which a user places a finger when operating the trigger body. The extending direction may be defined by a tangent line that contacts the trigger bottom portion when the switch trigger is not operated among straight lines including a roller rotation axis, which is a rotation axis of the roller closer to the first handle among the drive roller and the driven roller, in a side view of the belt sander, and a tangent line of the first handle at an intersection where the tangent line intersects the back surface of the first handle.

[0031] In one or more embodiments, the extending direction may be defined by a tangent line of the first handle at an intersection where a straight line, in a side view of the belt sander, including a roller rotation axis, which is a rotation axis of the roller closer to the first handle among the drive roller and the driven roller, and having an acute angle of 55 degrees with the surface direction of the polishing surface, intersects the back surface of the first handle.

[0032] In one or more embodiments, further, the handle surrounding the battery is defined as a second handle, and an upper base connected to a position close to the upper surface portion among the back surface portions located on the side opposite to the second handle with the motor housing portion interposed therebetween in the housing, a lower base connected to a position close to the belt driving portion among the back surface portions, and a first gripping portion extending and connecting the upper base and the lower base, and a first handle having a switch trigger provided at a position facing the back surface portion of the first gripping portion are provided. In a side view of the belt sander, a normal line to the extending direction of the first gripping portion and passing through a position on the side opposite to the switch trigger of the first gripping portion may pass between the rotation axis of the drive roller and the rotation axis of the driven roller. According to the belt sander of this form, it becomes easier for the user to apply a force to press the belt sander against the polishing surface. Therefore, the user can easily perform both the operation of gripping the first handle and pressing the polishing surface against the object to be processed, and the operation of moving the belt sander to change the processing position.

[0033] In one or more embodiments, the normal line may intersect the polishing surface in a side view of the belt sander. According to the belt sander of this form, it becomes easier for the user to apply a force to press the belt sander against the polishing surface. Therefore, the user can easily perform both the operation of gripping the first handle and pressing the polishing surface against the object to be processed, and the operation of moving the belt sander to change the processing position.

[0034] In one or more embodiments, in a top view of the belt sander, at least a part of the battery mounting portion may overlap at least a part of the polishing surface. According to the belt sander of this form, the weight of the battery mounted on the battery mounting portion can be utilized for pressing the polishing surface, and the workability of the belt sander can be improved.

[0035] In one or more embodiments, further, a light emitting portion may be provided on the surface of the housing and capable of irradiating light. The light emitting portion may be capable of switching the optical axis of the light between a first irradiation direction intersecting the surface direction of the polishing surface and a second irradiation direction not intersecting the surface direction of the polishing surface. According to the belt sander of this form, the user can change the irradiation direction of the light emitting portion according to the rotational position of the second handle, etc., and the workability by the belt sander can be improved.

[0036] A. First Embodiment: A belt sander 100 as an embodiment of the present disclosure will be described. As shown in FIG. 1, the belt sander 100 includes a belt drive unit 40, a drive transmission unit 50, a housing 60, a front handle 70, a main handle 80, a light emitting unit 90, a motor 20 (see FIG. 12), a battery mounting unit 30 (see FIG. 2), and a dust box DB. The belt sander 100 is a tool capable of performing a machining operation by driving a belt drive unit 40 that holds an endless sanding belt 46 with a motor 20 and bringing a polishing surface FS of the driven sanding belt 46 into contact with a workpiece. Note that the belt sander 100 described in the present disclosure is also called an "up-handle type belt sander". The up-handle type belt sander is a type of belt sander in which the main handle 80, the motor 20, etc. are arranged on the side opposite to the polishing surface of the sanding belt 46.

[0037] The belt sander 100 can be arbitrarily switched by the user between a first usage mode and a second usage mode. The first usage mode is a mode in which the belt sander 100 is gripped and operated, and a machining operation is performed while bringing the polishing surface FS into contact with a workpiece. In the first usage mode, the user, for example, grips the main handle 80 and the front handle 70, and moves the belt sander 100 while pressing the polishing surface FS against the workpiece, thereby machining a desired location. The second usage mode is a mode in which a workpiece is pressed against the placed belt sander 100 to perform a machining operation. More specifically, the belt sander 100 is inverted up and down from the state shown in FIG. 1, and placed on a workbench or the like with the polishing surface FS facing vertically upward. The user performs a machining operation by gripping the workpiece and pressing it against the polishing surface FS.

[0038] The belt drive unit 40 includes a drive roller 42, a driven roller 44 disposed on one side of the drive roller 42, and a support frame 48 (see FIG. 12) that rotatably supports them around an axis. The rotation axis of the drive roller 42 is also referred to as the "roller rotation axis XR1", and the rotation axis of the driven roller 44 is also referred to as the "driven rotation axis XR2". The drive roller 42 and the driven roller 44 are arranged parallel to each other, and the roller rotation axis XR1 and the driven rotation axis XR2 are parallel to each other. An endless sanding belt 46 is stretched between the drive roller 42 and the driven roller 44.

[0039] Hereinafter, for convenience of explanation, the direction in which the drive roller 42 and the driven roller 44 are arranged is defined as the "front-rear direction" of the belt sander 100. The direction in which the drive roller 42 is provided with respect to the driven roller 44 is the "rear direction", and the direction in which the driven roller 44 is provided with respect to the drive roller 42 is the "front direction". The axial direction of the roller rotation axis XR1 of the drive roller 42 is defined as the "left-right direction" of the belt sander 100. The direction orthogonal to the front-rear direction and the left-right direction is defined as the "up-down direction" of the belt sander 100. Among the up-down directions, the direction approaching the polishing surface FS from a predetermined position of the belt sander 100 is defined as the "downward direction", and the opposite direction is defined as the "upward direction". In the present disclosure, the case where the vertical direction when the polishing surface FS is placed on a horizontal plane coincides with the up-down direction is used as an example.

[0040] The housing 60 is a housing that houses a microcomputer (not shown) that controls each part of the belt sander 100, a motor 20, and the like. The housing 60 includes a bottom portion 61, an upper surface portion 62 on the side opposite to the bottom portion 61, a first side surface portion 63 located between the bottom portion 61 and the upper surface portion 62, a second side surface portion 64 located between the bottom portion 61 and the upper surface portion 62, a motor housing portion 65 that houses the motor 20, a rear surface portion 66, and a front surface portion 67. The first side surface portion 63 is a portion of the housing 60 that connects the bottom portion 61 and the motor housing portion 65. The second side surface portion 64 is located on the side opposite to the first side surface portion 63 of the housing 60 and is a portion that connects the bottom portion 61 and the motor housing portion 65. The first side surface portion 63 and the second side surface portion 64 are substantially planar in a longitudinal direction in the front-rear direction, with their surface directions intersecting the roller rotation axis XR1 of the drive roller 42. In the present embodiment, the first side surface portion 63 is located on the left side of the housing 60, and the second side surface portion 64 is located on the right side of the housing 60.

[0041] The bottom portion 61 is the lower portion of the housing 60. The bottom portion 61 holds the belt drive portion 40 with the polishing surface FS exposed to the outside. The upper surface portion 62 is the upper surface of the housing 60. The upper surface portion 62 is a plane that is substantially orthogonal to the vertical direction and substantially parallel to the polishing surface FS. In the present embodiment, the upper surface portion 62 coincides with the top surface of the motor housing portion 65 and has a substantially rectangular shape. Since the upper surface portion 62 is configured in a planar shape, it is easy to place the belt sander 100 in the second usage mode, which is upside down from the state shown in FIG. 1, on a workbench or the like.

[0042] The front surface portion 67 is in the vicinity of the driven roller 44 and the front handle 70 in the housing 60 and is a portion located between the battery mounting portion 30 and the belt drive portion 40. The front surface portion 67 is substantially parallel to the roller rotation axis XR1 of the drive roller 42 and is substantially planar in a longitudinal direction in the left-right direction.

[0043] The rear surface portion 66 is in the vicinity of the drive roller 42 in the housing 60 and is located on the side opposite to the front handle 70 with the motor housing portion 65 interposed therebetween. The rear surface portion 66 is located between the bottom portion 61 and the upper surface portion 62 and is substantially planar in a longitudinal direction in the vertical direction.

[0044] The motor housing portion 65 is a box having an outer shape of a substantially rectangular parallelepiped. The motor housing portion 65 houses the motor 20 as will be described later. A battery BAT for supplying power to the motor 20 is disposed on the front side of the motor housing portion 65. In the present disclosure, as the battery BAT, a rechargeable battery having a well-known configuration is used. Note that the size of the battery BAT can be arbitrarily switched according to the weight, output, or driving time required for the belt sander 100. In the present embodiment, the battery BAT will be described using a generally sized battery BAT that can be attached and detached regardless of the rotational position of the front handle 70 described later.

[0045] As shown in FIG. 2, the battery mounting portion 30 is provided on the front side of the motor housing portion 65. The battery mounting portion 30 has a guide rail 32 and a terminal 34. In the present disclosure, the guide rail 32 is formed along the front-rear direction. The guide rail 32 engages with a rail receiving portion (not shown) of the battery BAT and defines the moving direction when the battery BAT is attached and detached. For example, the user can remove the battery BAT from the battery mounting portion 30 by sliding the battery BAT fitted to the guide rail 32 forward in the direction toward the front handle 70, and can attach the battery BAT to the battery mounting portion 30 by sliding the battery BAT backward along the guide rail 32 toward the motor housing portion 65. The battery BAT attached to the battery mounting portion 30 is electrically connected via the terminal 34, enabling power supply to the motor 20 and the like. The battery mounting portion 30 may further include a lock mechanism for restricting the forward and backward movement of the battery BAT.

[0046] FIG. 3 schematically shows the positional relationship among the battery BAT, the battery mounting portion 30, and the polishing surface FS in a top view of the belt sander 100. In FIG. 3, for ease of understanding, the arrangement area ARb of the battery BAT in the top view, the arrangement area AR1 of the polishing surface FS with hatching, and the arrangement area AR2 of the battery mounting portion 30 with cross-hatching are schematically shown. As shown in FIG. 3, at least a part of the arrangement area AR2 of the battery mounting portion 30 in the top view is configured to overlap at least a part of the arrangement area AR1 of the polishing surface FS. In other words, at least a part of the battery mounting portion 30 overlaps at least a part of the polishing surface FS. By configuring in this way, when the battery BAT is mounted on the battery mounting portion 30, the load of the battery BAT can be applied to the polishing surface FS using gravity. Therefore, the weight of the battery BAT can be utilized for pressing the polishing surface FS, and the workability of the belt sander 100 can be improved. In the present embodiment, the arrangement area AR1 of the polishing surface FS is configured to include all of the arrangement area AR2 of the battery mounting portion 30. By configuring in this way, the overlapping area between the arrangement area AR2 of the battery BAT and the arrangement area AR1 of the polishing surface FS can be widened, and a larger load of the battery BAT can be applied to the polishing surface FS.

[0047] As shown in FIG. 1, the front handle 70 is disposed in front of the belt sander 100. The front handle 70 is an example of the "handle" and the "second handle". The front handle 70 has a first extension portion 71 connected to the first side surface portion 63 of the housing 60, a second extension portion 72 connected to the second side surface portion 64, and a second gripping portion 77 connecting the first extension portion 71 and the second extension portion 72. The front handle 70 has an annular external shape by the first extension portion 71, the second extension portion 72, and the second gripping portion 77. However, on the premise that the front handle 70 has the functions, the front handle 70 may have a non-annular external shape, for example, a part of the first extension portion 71, the second extension portion 72, and the second gripping portion 77 is separated.

[0048] In this embodiment, as will be described later, the second extension portion 72 is connected to the second side surface portion 64 via the second connecting portion 74. The second connecting portion 74 is a component for rotatably connecting the second extension portion 72 to the second side surface portion 64. The first extension portion 71 is connected to the first side surface portion 63 via the first connecting portion 73 (see FIG. 12). The first connecting portion 73 is a component for rotatably connecting the first extension portion 71 to the first side surface portion 63 around the rotation axis XH. By configuring in this way, the front handle 70 is rotatably supported with respect to the housing 60. As shown in FIG. 1, the housing 60 is provided with a first restricting portion E1 and a second restricting portion E2. When the front handle 70 is rotated in one direction, the front handle 70 comes into contact with the first restricting portion E1 provided on the second side surface portion 64, and when rotated in the other direction, the front handle 70 comes into contact with the second restricting portion E2. As a result, the rotation angle of the front handle 70 is restricted within the range from the first restricting portion E1 to the second restricting portion E2. The first extension portion 71 may also be provided with a restricting portion similar to the second extension portion 72. Note that the front handle 70 is not limited to only a rotatable form. The front handle 70 may be fixed to the housing 60 and configured not to rotate. Even in such a configuration, by arranging the front handle 70 so as to surround at least a part of the battery BAT, the protection of the battery BAT can be strengthened.

[0049] As shown in FIG. 4, the main handle 80 is provided on the back surface portion 66. The main handle 80 is an example of the "first handle". The main handle 80 includes a first gripping portion 82, a switch mechanism SW, an upper base portion 86, and a lower base portion 88. Each part of the main handle 80 is formed using a synthetic resin, but may be formed using any material.

[0050] The upper base 86 is connected to a position near the upper surface portion 62 of the back surface portion 66, that is, near the upper end of the back surface portion 66, and is a portion extending rearward from the back surface portion 66. The lower base 88 is connected to a position near the belt drive portion 40 of the back surface portion 66, that is, near the lower end of the back surface portion 66, and is a portion extending rearward from the back surface portion 66. The first gripping portion 82 is a component connecting the upper base 86 and the lower base 88, and has a substantially cylindrical shape extending in the vertical direction. The first gripping portion 82 is used for the user to grip when using the belt sander 100.

[0051] Thus, the main handle 80 extends rearward from the back surface portion 66 of the housing 60, bends in the vertical direction, extends in the vertical direction and bends forward, and extends toward the back surface portion 66. That is, the main handle 80 is configured to be annular. By being configured annularly, a space SP for the user to pass a finger through is defined between the main handle 80 and the back surface portion 66 when the user grips the main handle 80.

[0052] The switch mechanism SW switches between driving and stopping of the motor 20 in response to a manual operation of the user. As shown in FIG. 4, the switch mechanism SW includes a switch trigger 84, a lock-off trigger 83, a lock-on button 85, and a dial 89. Note that in FIG. 4, the switch mechanism SW is in an initial state where the motor 20 stops, and the belt sander 100 is in an off state.

[0053] The switch trigger 84 is a so-called momentary type switch provided at a position facing the back surface portion 66 in the first gripping portion 82. The switch trigger 84 has a trigger body 842, a trigger surface 844, and a trigger bottom 846. The trigger surface 844 is a portion that the user touches when operating by the user in the trigger body 842. A lock-off trigger 83 is provided on the trigger surface 844. The trigger bottom 846 has a substantially arc shape in a side view of the belt sander 100 and is a portion located below the trigger body 842. For example, the user places a finger on the trigger surface 844 while gripping the first gripping portion 82 and pushes down the trigger body 842 toward the first gripping portion 82. As a result, the motor 20 is driven and the belt sander 100 is switched to the on state. The switch trigger 84 is arranged in an initial state by a biasing member (not shown) when not operated. In this specification, the "side view of the belt sander 100" means a state of viewing the belt sander 100 along the roller rotation axis XR1 of the drive roller 42.

[0054] The lock-off trigger 83 is a so-called momentary type switch. The lock-off trigger 83 has a convex shape protruding from the trigger surface 844. The lock-off trigger 83 has a function of restricting the pushing-down operation of the switch trigger 84. This function is a function of maintaining the off state of the switch trigger 84 and is also called the "lock-off function". The lock-off trigger 83 is maintained in an initial state by a biasing member (not shown). The user can rotate or push down the lock-off trigger 83 by applying a predetermined force to the lock-off trigger 83 in the initial state, and can cancel the lock-off function. That is, the user can switch the belt sander 100 to the on state by operating the lock-off trigger 83 with the finger placed on the trigger surface 844 to cancel the lock-off function and pushing in the trigger body 842.

[0055] The lock-on button 85 is composed of a so-called momentary type lock button. The lock-on button 85 has a function of maintaining the belt sander 100 in an on state. Specifically, when the lock-on button 85 is pressed while the trigger body 842 is in a depressed state, the trigger body 842 is fixed in the depressed state. This function is a function of maintaining the on state of the switch trigger 84 and is also called the "lock-on function". By pressing the switch trigger 84 again, the lock-on button 85 returns to its initial position and the lock-on function is released. The dial 89 is provided exposed on the upper base 86. The user can adjust the number of revolutions per unit time of the motor 20 by rotating the dial 89.

[0056] [Tangent and normal according to the first defined method in the extending direction of the main handle] As shown in FIG. 5, in the present embodiment, the first grip portion 82 of the main handle 80 is arranged such that the lower portion is farther from the back surface portion 66 than the upper portion. That is, the extending direction DC of the first grip portion 82 is inclined at a predetermined inclination angle θ1 with respect to the surface direction of the polishing surface FS so as to approach the housing 60 as it goes from the lower side to the upper side in the side view of the belt sander 100 shown in FIG. 5.

[0057] In the present embodiment, as shown in FIG. 6, the stretching direction DC is defined using a side view of the belt sander 100 in a state where the switch trigger 84 is not operated. Specifically, the stretching direction DC is the perpendicular bisector VL of the straight line 844L connecting the upper end 844T and the lower end 844B of the trigger surface 844 exposed outside the belt sander 100, and the tangent line TL at the intersection position CP where the tangent line TL intersects with the back surface 80B of the first gripping portion 82 which is the back surface of the main handle 80. The intersection position CP defines a position on the back surface 80B of the main handle 80 that is on the opposite side of the switch trigger 84 with the first gripping portion 82 interposed therebetween. The "position on the opposite side of the switch trigger 84" is an example of a force application point for a user gripping the main handle 80 to apply a force for pressing the belt sander 100 toward the polishing surface FS.

[0058] When the user uses the belt sander 100 in the first usage mode, for example, the user performs a first operation of gripping the main handle 80 and pressing the polishing surface FS against the object to be processed, and a second operation of moving the belt sander 100 to change the processing position. It can be said that the stretching direction DC is a parameter that affects the workability of the belt sander 100 by the user. For example, when the stretching direction DC is arranged perpendicular to or close to the polishing surface FS, specifically, when the inclination angle θ1 is greater than 60 degrees and less than or equal to 90 degrees, although the second operation becomes easier for the user, it becomes difficult to press the polishing surface FS against the object to be processed, and the overall workability of the belt sander 100 decreases. Further, for example, when the stretching direction DC is arranged parallel to or close to the polishing surface FS, that is, when the inclination angle θ1 is greater than or equal to 0 degrees and less than 20 degrees, although the first operation becomes easier, it becomes difficult to move the belt sander 100, and the overall workability of the belt sander 100 decreases.

[0059] In this embodiment, the inclination angle θ1 of the stretching direction DC with respect to the polishing surface FS is set to 37.5 degrees. In this case, the normal line NM1 with respect to the stretching direction DC at the intersection position CP is in the direction toward the polishing surface FS. More specifically, the normal line NM1 passes between the roller rotation axis XR1 and the driven rotation axis XR2, and intersects the polishing surface FS at the intersection CF1. Therefore, it is easy for the user to press the belt sander 100 toward the polishing surface FS while gripping the main handle 80. Thus, according to the belt sander 100 configured in this way, the user can suitably perform both the first operation and the second operation, and the workability of the belt sander 100 can be improved. Note that the inclination angle θ1 is not limited to only 37.5 degrees and may be arbitrarily set. However, from the viewpoint of improving the workability of the belt sander 100, the lower limit value of the inclination angle θ1 is preferably 20 degrees or more, and more preferably 30 degrees or more. Also, the upper limit value of the inclination angle θ1 is preferably 60 degrees or less, and more preferably 50 degrees or less.

[0060] [Tangent line and normal line by the second defining method of the stretching direction of the main handle] As shown in FIGS. 7 and 8, the stretching direction DC2 may be defined by a tangent line CL that contacts the trigger bottom 846 when the switch trigger 84 is not operated and a tangent line TL2 at the intersection position CP2 where the tangent line CL including the roller rotation axis XR1 of the drive roller 42 and the back surface 80B of the main handle 80 intersect in a side view of the belt sander 100. FIGS. 7 and 8 show a contact point 846c between the tangent line CL including the roller rotation axis XR1 of the drive roller 42 and the trigger bottom 846.

[0061] In the example of FIG. 7, the inclination angle θ2 of the stretching direction DC2 with respect to the polishing surface FS is 38.1 degrees. In this case, the normal line NM2 to the stretching direction DC2 at the intersection position CP2 is in the direction toward the polishing surface FS. More specifically, the normal line NM2 passes between the roller rotation axis XR1 and the driven rotation axis XR2 and intersects the polishing surface FS at the intersection point CF2. Therefore, even with the belt sander 100 configured in this way, the user can suitably perform both the first operation and the second operation, and the workability of the belt sander 100 can be improved. Note that not limited to the rotation axis of the driving roller 42, when the driven roller 44 is closer to the main handle 80, the rotation axis of the driven roller 44 may be used as the starting point.

[0062] [Tangent line and normal line by the third method of defining the stretching direction of the main handle] Also, as shown in FIG. 9, the stretching direction DC3 may be defined by a tangent line TL3 at the intersection position CP3 where a straight line FL, in which the acute angle θf with the surface direction of the polishing surface FS is 55 degrees among the straight lines including the roller rotation axis XR1 of the driving roller 42, intersects the back surface 80B of the main handle 80 in the side view of the belt sander 100. In the example of FIG. 9, the inclination angle θ3 of the stretching direction DC3 with respect to the polishing surface FS is 38.3 degrees. In this case, the normal line NM3 to the stretching direction DC3 at the intersection position CP3 is in the direction toward the polishing surface FS. More specifically, the normal line NM3 passes between the roller rotation axis XR1 and the driven rotation axis XR2 and intersects the polishing surface FS at the intersection point CF3. Therefore, even with the belt sander 100 configured in this way, the user can suitably perform both the first operation and the second operation, and the workability of the belt sander 100 can be improved. Note that not limited to the rotation axis of the driving roller 42, when the driven roller 44 is closer to the main handle 80, the rotation axis of the driven roller 44 may be used as the starting point.

[0063] As shown in FIG. 4, the light emitting unit 90 is disposed on the surface of the housing 60. The light emitting unit 90 is, for example, an LED illumination powered by a battery BAT, and can irradiate light along a predetermined optical axis such as a first irradiation direction LD1. In the first usage mode, for example, the light emitting unit 90 can improve the visibility of the working area by illuminating the polished surface FS, the object to be processed, or the surroundings thereof.

[0064] As shown in FIG. 10, in the present embodiment, the light emitting unit 90 is configured to be able to switch the optical axis by a manual operation by the user. Specifically, the light emitting unit 90 is configured to be able to switch the optical axis to either a first irradiation direction LD1 that intersects at least the surface direction SD of the polished surface FS or a second irradiation direction LD2 that does not intersect the surface direction SD of the polished surface FS, or an arbitrary direction therebetween. In the side view of the belt sander 100 in the second usage mode shown in FIG. 6, the first irradiation direction LD1 is at an elevation angle of 30 degrees with respect to the virtual horizontal plane (a depression angle of 30 degrees in the first usage mode), and the second irradiation direction LD2 is at a depression angle of 15 degrees with respect to the horizontal plane (an elevation angle of 15 degrees in the first usage mode). By configuring in this way, the user can change the irradiation direction of the light emitting unit 90 according to the usage form of the belt sander 100 or the rotational position of the front handle 70, etc., and can improve the workability of the belt sander 100. Note that the optical axis of the light emitting unit 90 is not limited to an elevation angle of 15 degrees or more and a depression angle of 30 degrees or less, and may be set, for example, to a depression angle of 30 degrees or more, a depression angle of 45 degrees or more, etc., or may be set within an arbitrary angle range such as an elevation angle of 15 degrees or less, an elevation angle of 30 degrees or less, an elevation angle of 45 degrees or less, etc.

[0065] As shown in FIG. 11, the drive transmission unit 50 is provided on the first side surface portion 63 of the housing 60. The drive transmission unit 50 transmits the driving force of the motor 20 to the belt drive unit 40. FIG. 12 shows the first side surface portion 63 of the housing 60, the left side surface of the main handle 80, and the belt sander 100 with the dust box DB removed in order to facilitate understanding of the internal configuration of the belt sander 100. The motor 20 is driven by the electric power supplied from the battery BAT mounted on the battery mounting portion 30. In the present embodiment, a brushless DC motor is adopted as the motor 20. As shown in FIG. 12, the motor 20 includes a motor body 202 having a stator and a rotor (not shown), and a shaft 204 that rotates integrally with the rotor. The shaft 204 has a rotation axis XM extending in the left-right direction. The shaft 204 is supported by the housing 60 via a bearing (not shown).

[0066] The motor 20 may be provided with a fan. The fan can function, for example, as a dust collection fan for cooling the motor 20 and collecting dust in the dust box DB. The fan is fixed, for example, between the motor body 202 and the bearing on the shaft 204 and rotates integrally with the shaft 204. The fan generates an air flow for cooling the motor 20 and also generates an air flow for sucking dust generated from the belt drive unit 40 during the machining operation into the housing 60 and discharging it to the dust box DB.

[0067] As shown in FIG. 12, the drive transmission unit 50 includes a pulley 502 that rotates integrally with the shaft 204, an endless toothed belt 504, a gear mechanism 506 that can adjust the rotational speed of the shaft 204 and transmit it to the drive roller 42, and the like. The drive transmission unit 50 transmits the driving force of the motor 20 to the drive roller 42 of the belt drive unit 40 via the pulley 502, the toothed belt 504, and the gear mechanism 506. As shown in FIG. 11, a plate 482 is provided on the bottom surface of the support frame 48 of the belt drive unit 40. The plate 482 protrudes toward the sanding belt 46 and is arranged so as to press the sanding belt 46 in a planar manner. The plate 482 generates a predetermined tension in the sanding belt 46 stretched between the drive roller 42 and the driven roller 44. As a result, the contact surface between the plate 482 and the sanding belt 46 functions as a polishing surface FS. In the present embodiment, the polishing surface FS is a surface parallel to the front-rear direction and the left-right direction.

[0068] With reference to FIGS. 13 and 14, the configuration of the front handle 70 included in the belt sander 100 according to the present embodiment will be described. As described above, the front handle 70 has a first extension portion 71 connected to the first side surface portion 63 of the housing 60, a second extension portion 72 connected to the second side surface portion 64, a second gripping portion 77 that connects the first extension portion 71 and the second extension portion 72, and a shaft portion 76.

[0069] As shown in FIG. 13, the first extension portion 71 and the second extension portion 72 are components that extend from the connection portion with the housing 60 toward the outside of the belt sander 100. The first extension portion 71 and the second extension portion 72 may be formed using any material. In the present embodiment, the first extension portion 71 is formed using a synthetic resin. For example, it is polycarbonate that does not contain glass fiber. The second extension portion 72 is formed using metal. For example, it is a hot-rolled mild steel sheet (SPHC: JIS G 3131). However, the first extension portion 71 and the second extension portion 72 may be formed using the same material as each other. Also, the first extension portion 71 may be formed using metal and the second extension portion 72 may be formed using a synthetic resin. The extension portion formed using a synthetic resin is also referred to as "one extension portion", and the extension portion formed using metal is also referred to as "the other extension portion".

[0070] In the present embodiment, the second extension portion 72 made of metal is disposed on the second side surface portion 64, which is on the side opposite to the first side surface portion 63 where the drive transmission portion 50 is disposed. By configuring in this way, the second extension portion 72, which is more likely to have a larger mass than the first extension portion 71, can be disposed on the side opposite to the drive transmission portion 50, which is likely to have a larger mass. Therefore, it becomes easier to equalize the weight balance of the entire belt sander 100 than in the case where the second extension portion 72 is made of synthetic resin and the first extension portion 71 is made of metal.

[0071] FIG. 13 shows the cross-sectional width W1 of the first extension portion 71 and the cross-sectional width W2 of the second extension portion 72. The cross-sectional width W2 of the second extension portion 72 is configured to be narrower on the premise that the front handle 70 has sufficient strength. In the example of FIG. 13, the cross-sectional width W2 is designed to be narrower than the cross-sectional width W1 of the first extension portion 71. By configuring in this way, for example, even when performing a polishing operation on a processing target having a processing surface and a wall surface adjacent to the processing surface with the belt sander 100, it becomes easier to bring the second side surface portion 64 closer to the wall surface adjacent to the processing surface while polishing the processing surface, and it becomes easier to perform a polishing operation near the wall surface. Also, by making the second extension portion 72 made of metal, compared with the case where it is made of resin, it becomes easier to design to reduce the width while obtaining the strength of the second extension portion 72. Note that the present embodiment is not limited to the above, and the cross-sectional width W1 of the first extension portion 71 and the cross-sectional width W2 of the second extension portion 72 may be designed to be the same, or the cross-sectional width W1 may be set to be smaller than the cross-sectional width W2. Even in such a configured case, by arranging the front handle 70 so as to surround at least a part of the battery BAT, the protection of the battery BAT can be strengthened.

[0072] The second gripping portion 77 is used for the user to grip with one hand when using the belt sander 100. In the present embodiment, the second gripping portion 77 is integrally formed with the first extension portion 71. That is, the material of the second gripping portion 77 is the same as that of the first extension portion 71. However, the second gripping portion 77 may be formed using an arbitrary material. Also, a material different from that of the first extension portion 71 may be used for the second gripping portion 77, and it may be formed separately from the first extension portion 71.

[0073] The second extension 72 includes a first portion 721 and a second portion 722. The first portion 721 is the portion of the second extension 72 that extends outward from the connection position with the housing 60 toward the outside of the belt sander 100. The second portion 722 is the portion that bends from the tip 721E of the first portion 721, which is on the side opposite to the connection position with the housing 60 among the ends of the first portion 721, toward the second gripping portion 77. As shown in FIG. 13, the second portion 722 is disposed inside the second gripping portion 77 and is connected to the second gripping portion 77 by bolts or the like.

[0074] The front handle 70 is on the left side surface of the housing 60 around the battery BAT, extends forward from the left side of the battery mounting portion 30, bends in front of the belt sander 100 and in front of the battery mounting portion 30, and is continuously provided up to the right side surface of the housing 60 and the right side of the battery mounting portion 30. Thus, in the belt sander 100 according to the present embodiment, the arrangement position of the front handle 70 is configured to surround at least a part of the battery BAT mounted on the battery mounting portion 30. By surrounding the battery BAT with the front handle 70, the battery BAT can be protected from impacts and the like. Whether the front handle 70 surrounds at least a part of the battery BAT can be determined, for example, when the belt sander 100 with the battery BAT mounted is dropped onto a predetermined horizontal plane with any one of the upper surface portion 62, the back surface portion 66, the first side surface portion 63, and the second side surface portion 64 arranged vertically downward, by whether the horizontal plane contacts the front handle 70 before contacting the battery BAT.

[0075] As shown in FIG. 13, the first extension portion 71 is connected to the first side surface portion 63 via the first connecting portion 73, and the second extension portion 72 is connected to the second side surface portion 64 via the second connecting portion 74. The shaft portion 76 is a shaft-like member inserted through the first connecting portion 73 and the second connecting portion 74. The shaft portion 76 extends from the first connecting portion 73 to the second connecting portion 74 and defines the rotation axis XH of the front handle 70. In the present embodiment, the first connecting portion 73 is the tip portion of the first extension portion 71 and is integrally formed with the first extension portion 71. However, the first connecting portion 73 and the first extension portion 71 may be different members from each other. The first connecting portion 73 protrudes toward the first side surface portion 63. The protruding portion is received in a concave-shaped first connecting recess 632 formed in the first side surface portion 63. The first connecting portion 73 includes a cam surface 73S and a claw portion 732a that functions as a connecting engagement portion 732 on the protruding portion. The cam surface 73S is configured to be engageable with a cam surface 63S formed in the first connecting recess 632. In FIG. 13, the cam surface 73S and the cam surface 63S are in an engaged state. By the cam surface 73S and the cam surface 63S meshing with each other, it is easy to position the rotation position of the front handle 70 at a plurality of rotation angles. The claw portion 732a is a member for suppressing the shaft portion 76 from falling off from the housing 60, as will be described later.

[0076] The second connecting portion 74 is a component provided at the other end of the second extension portion 72 on the side opposite to the tip 721E. The second connecting portion 74 is formed by connecting a male screw portion 742, a female screw portion 744, and a fixture 746 to each other. The fixture 746 is a substantially columnar component corresponding to the concave shape of a second connecting recess 642 formed in the second side surface portion 64. A through hole for accommodating the female screw portion 744 is formed in the fixture 746.

[0077] The female screw portion 744 is connected to the fixture 746 while being accommodated in the through-hole of the fixture 746. One end of the female screw portion 744 is inserted into a through-hole 721H formed at the other end of the first portion 721 of the second extension portion 72. The female screw portion 744 has a through-hole, and a female screw is formed on the inner surface of the through-hole. In a state where the female screw portion 744 is inserted into the through-hole 721H, a male screw formed on the male screw portion 742 is screwed into the female screw of the female screw portion 744. As a result, the second connecting portion 74 and the second extension portion 72 are connected. Further, a male screw formed at the other end 76E2 of the shaft portion 76 is screwed into the female screw of the female screw portion 744. FIG. 13 shows a state where the shaft portion 76 is screwed into the female screw portion 744.

[0078] On the surface of the fixture 746 facing the second side surface portion 64, a cam surface 74S is formed. The cam surface 74S is configured to be engageable with the cam surface 64S formed in the second connecting recess 642. By the cam surface 74S and the cam surface 64S meshing with each other, as will be described later, it becomes easy to position the rotational position of the front handle 70 at a plurality of rotational angles.

[0079] As shown in FIG. 13, the front handle 70 includes a detaching operation portion 78. The detaching operation portion 78 is a component for switching the front handle 70 between a rotation suppression state that suppresses the rotation of the front handle 70 and a rotation state that enables the front handle 70 to rotate. The detaching operation portion 78 is a so-called knob that can adjust the loosening of the connection between the first connecting portion 73 and the first side surface portion 63 and the connection between the second connecting portion 74 and the second side surface portion 64.

[0080] The attachment / detachment operation part 78 is fixed to one end 76E1 of the shaft part 76. Therefore, the attachment / detachment operation part 78 can move the shaft part 76 in a first direction DX1 toward the first side surface part 63 along the rotation axis XH and in a second direction DX2 opposite to the first direction DX1. By rotating the attachment / detachment operation part 78 in the positive direction about the rotation axis XH of the shaft part 76, the other end 76E2 of the shaft part 76 and the female screw part 744 are screwed together, and the second connection part 74 is pushed into the second connection recessed part 642. Further, when the attachment / detachment operation part 78 is rotated in the positive direction, the end surface 78E of the attachment / detachment operation part 78 contacts the end surface 73E of the first connection part 73, and the first connection part 73 is pushed out in the first direction DX1 by the end surface 78E and pushed into the first connection recessed part 632. As a result, the first connection part 73 and the second connection part 74 sandwich the housing 60 in a state of being accommodated in the first connection recessed part 632 and the second connection recessed part 642. At this time, the cam surface 74S and the cam surface 64S mesh with each other, and the cam surface 73S and the cam surface 63S mesh with each other, so that the front handle 70 is switched to a rotation suppression state at a predetermined rotation position. In the present embodiment, an example in which both the cam surface 74S and the cam surface 64S and the cam surface 73S and the cam surface 63S mesh with each other by the operation of the attachment / detachment operation part 78 is shown, but a cam surface may be provided only on either the first connection part 73 or the second connection part 74.

[0081] As shown in FIG. 14, when the attachment / detachment operation part 78 is rotated in the reverse direction about the rotation axis XH, the screwing between the other end 76E2 of the shaft part 76 and the female screw part 744 is loosened. As a result, the first connection part 73 moves in the second direction DX2 along the rotation axis XH with respect to the housing 60, the clamping of the housing 60 by the first connection part 73 and the second connection part 74 is loosened, and the meshing of the cam surfaces is released. As a result, the front handle 70 is switched to a rotatable state with respect to the housing 60.

[0082] When the attachment / detachment operation part 78 is rotated in the reverse direction, the screwing engagement between the other end 76E2 of the shaft part 76 and the female screw part 744 is released. As shown in FIG. 14, an urging member 782 for urging the attachment / detachment operation part 78 in the second direction DX2 with respect to the housing 60 is provided between the attachment / detachment operation part 78 and the first connecting part 73. As a result, when the screwing engagement between the other end 76E2 of the shaft part 76 and the female screw part 744 is released, the attachment / detachment operation part 78 is pushed out by the urging member 782, and the shaft part 76 pops out from the front handle 70 and the housing 60. At this time, the attachment / detachment operation part 78 and the shaft part 76 may fall off from the front handle 70 and the housing 60. In contrast, the belt sander 100 according to the present embodiment is provided with a fall prevention mechanism, and it is possible to suppress or prevent the attachment / detachment operation part 78 and the shaft part 76 from falling off from the front handle 70 and the housing 60. The urging member 782 is a member provided for the convenience of operating the attachment / detachment operation part 78, and it can also be omitted.

[0083] With reference to FIG. 15, the configuration of the fall prevention mechanism provided in the belt sander 100 of the present disclosure will be described. The fall prevention mechanism includes a connecting engagement part 732 provided on the first connecting part 73 and having a convex shape or a concave shape, and a shaft engagement part 762 provided on the shaft part 76 and having a concave shape or a convex shape corresponding to the connecting engagement part 732. In the present embodiment, the connecting engagement part 732 is a claw part 732a provided on the wall surface of a through hole 73T formed in the first connecting part 73 for inserting the shaft part 76. The shaft engagement part 762 is a shaft concave part 762a formed in the shaft part 76. The shaft concave part 762a has a concave shape by being formed with a smaller shaft diameter than other parts of the shaft part 76. In both the rotation state shown in FIG. 14 and the rotation suppression state shown in FIG. 15, the connecting engagement part 732 and the shaft engagement part 762 are engaged with each other.

[0084] The claw portion 732a is a portion of the first connecting portion 73 that has a convex shape protruding from the wall surface of the through hole 73T toward the shaft portion 76. The claw portion 732a has a regulating surface 73E1 perpendicular to the rotation axis XH of the shaft portion 76, an inclined surface 73E2 facing the shaft portion 76, and a back surface 73E3 on the side opposite to the inclined surface 73E2. The claw portion 732a is a structure that is fitted into the shaft recess 762a. Note that the shaft recess 762a has a predetermined width from one end 762E1 to the other end 762E2 along the axial direction of the shaft portion 76. Therefore, the claw portion 732a can reciprocate within the range from one end 762E1 to the other end 762E2 in a state of being fitted with the shaft recess 762a.

[0085] When the detachable operation portion 78 is operated and the front handle 70 is set in a rotating state, the shaft portion 76 moves in the second direction DX2 with respect to the claw portion 732a in a state of being fitted with the shaft recess 762a. When the shaft portion 76 moves in the second direction DX2, the regulating surface 73E1 of the claw portion 732a is locked by one end 762E1 of the shaft recess 762a. As a result, the shaft portion 76 is restricted from further moving in the second direction DX2. The position where the further movement of the shaft portion 76 in the second direction DX2 is restricted due to the engagement between the connecting engagement portion 732 and the shaft engagement portion 762 is also referred to as the "restricted position RP". In the example of FIG. 14, the restricted position RP is the position where one end 762E1 of the shaft recess 762a is formed in the shaft portion 76.

[0086] As shown in FIG. 15, in the present embodiment, a restraining portion 634 is formed on the first side surface portion 63. The restraining portion 634 suppresses or prevents the engagement between the claw portion 732a and the shaft recess 762a from being released. Here, the engagement between the claw portion 732a and the shaft recess 762a can be released, for example, by removing the claw portion 732a from the other end 762E2 of the shaft recess 762a using the inclined surface 73E2. In this case, the claw portion 732a deforms in a direction away from the shaft portion 76 to such an extent that it can be detached from the shaft recess 762a. In other words, the claw portion 732a deforms into a state where the back surface 73E3 is warped in order to be detached from the shaft recess 762a.

[0087] The restraining portion 634 is a recess formed in the first side surface portion 63, and is configured to be able to accommodate the claw portion 732a along the axial direction of the shaft portion 76. Specifically, as shown in FIG. 15, the restraining portion 634 accommodates the claw portion 732a in a state of being engaged with the shaft recess 762a at the regulation position RP in a state close to the back surface 73E3. Therefore, the deformation of the back surface 73E3 for the claw portion 732a to disengage from the shaft recess 762a is regulated by the restraining portion 634, and the claw portion 732a is suppressed or prevented from disengaging from the shaft recess 762a. By configuring in this way, it is possible to more reliably suppress or prevent the attachment / detachment operation portion 78 and the shaft portion 76 from falling off from the front handle 70 and the housing 60.

[0088] Together with FIG. 16, the rotational position of the front handle 70 will be described as appropriate with reference to FIG. 10. FIG. 16 shows the cross-sectional center XC of the second gripping portion 77 and a virtual horizontal plane HZ parallel to the polishing surface FS. In FIG. 16, for the sake of convenience of explanation, the case where the polishing surface FS of the belt sander 100 is placed on a workbench parallel to the horizontal plane HZ will be used as an example for explanation.

[0089] As described above, the front handle 70 can position the rotational position of the front handle 70 at a plurality of rotational angles about the rotation axis XH by the first connecting portion 73 and the first side surface portion 63 meshing with each other via their cam surfaces. Specifically, as shown in FIG. 16, the front handle 70 can be switched to positions R1, R2, R3, and R4 within the range from the first restricting portion E1 to the second restricting portion E2. In a side view, the position R1 is a position where the acute angle formed between the orientation of the front handle 70 and the horizontal plane HZ is 30 degrees. The "orientation of the front handle 70" can be defined, for example, by a straight line connecting the cross-sectional center XC of the second gripping portion 77 and the rotation axis XH. The position R2 is a position where the second gripping portion 77 is rotated 30 degrees closer to the main handle 80 from the position R1. The position R3 is a position where the second gripping portion 77 is rotated 30 degrees closer to the main handle 80 from the position R2, and the position R4 is a position where it is rotated 30 degrees from the position R3. However, these rotational angles may be set to arbitrary angles such as 15 degrees or 45 degrees.

[0090] The position R1 is a position suitable for a machining operation in the first usage mode where the user grips the second gripping portion 77 of the front handle 70 with one hand and the first gripping portion 82 of the main handle 80 with the other hand. The positions R2, R3, and R4 are positions where the detachment direction of the battery BAT and the second gripping portion 77 do not intersect, and are suitable positions for detaching the battery BAT from the battery mounting portion 30. The position R3 is an orientation perpendicular to the polishing surface FS and is a position suitable for the user to lift and carry the belt sander 100.

[0091] FIG. 16 schematically shows the arrangement range of the battery BAT in a side view with cross-hatching. In the belt sander 100 according to the present embodiment, the first extension portion 71 and the second extension portion 72 of the front handle 70 overlap at least a part of the battery BAT mounted on the battery mounting portion 30 in the side view of the belt sander 100, regardless of the rotational position of the front handle 70 at positions R1, R2, R3, and R4. By configuring in this way, even when the front handle 70 is arranged at any rotational position, the side surface of the battery BAT can be protected by using the first extension portion 71 and the second extension portion 72 of the front handle 70. In FIG. 15, since the second extension portion 72 is arranged on the opposite side of the housing 60 with respect to the first extension portion 71, only the first extension portion 71 is shown, but the second extension portion 72 also overlaps at least a part of the battery BAT in the same manner as the first extension portion 71. When the front handle 70 is non-rotatably fixed to the housing 60, it is only necessary that the first extension portion 71 and the second extension portion 72 of the front handle 70 in the fixed state overlap at least a part of the battery BAT.

[0092] FIG. 16 schematically shows a front end surface BE, which is a virtual vertical plane in contact with the front surface portion 67 of the belt sander 100 in a side view, and an upper end surface TE, which is a virtual horizontal plane in contact with the upper surface portion 62 of the belt sander 100. In the present embodiment, the upper end surface TE substantially coincides with the surface direction of the upper surface portion 62.

[0093] At position R1, the second gripping portion 77 is disposed on the front side of the front end face BE, that is, on the front side of the front end of the housing 60. Also, at position R1, at least a part of the second gripping portion 77 is configured to intersect the upper end face TE. In the example of FIG. 16, the upper end 77T of the second gripping portion 77 at position R1 intersects the upper end face TE. In other words, the upper end 77T of the second gripping portion 77 and the upper surface portion 62 are configured to be flush. By configuring in this way, as shown in FIG. 10, when performing a machining operation in the second usage mode with the polishing surface FS of the belt sander 100 facing upward, the belt sander 100 can be stably supported by the upper end 77T of the second gripping portion 77 and the upper surface portion 62. Therefore, the workability by the user can be improved compared to the case where the belt sander 100 is supported only by the upper surface portion 62.

[0094] Using FIG. 16, the arrangement position of the battery BAT will be described. In a side view, the upper surface Bt of the battery BAT is located below the upper end face TE, and the rear surface Bb of the battery BAT is located on the rear side of the front end face BE. In other words, the battery BAT is disposed inside the upper end and the front end of the belt sander 100. Thereby, the probability of contact between the falling surface due to the fall of the belt sander 100 and the battery BAT is reduced. Also, as shown in FIG. 10, when performing a machining operation in the second usage mode, a gap CR can be formed between the workbench and the upper surface Bt of the battery BAT. Therefore, in the second usage mode, contact between the battery BAT and the workbench or the like can be suppressed or prevented, and the protection of the battery BAT can be strengthened.

[0095] As described above, according to the belt sander 100 according to the present embodiment, the front handle 70 is disposed so as to surround at least a part of the battery BAT mounted on the battery mounting portion 30. By surrounding the battery BAT with the front handle 70, the battery BAT can be protected from impacts during the fall of the belt sander 100 and the like.

[0096] According to the belt sander 100 according to the present embodiment, the first extension portion 71 and the second extension portion 72 overlap at least a part of the battery BAT mounted on the battery mounting portion 30 in a side view of the belt sander 100. Therefore, the side surface of the battery BAT can be protected more strongly by using the first extension portion 71 and the second extension portion 72 of the front handle 70.

[0097] According to the belt sander 100 according to the present embodiment, the first extension portion 71 and the second extension portion 72 overlap at least a part of the battery BAT mounted on the battery mounting portion 30 in a side view of the belt sander 100, regardless of the position R1, R2, R3, R4 at which the front handle 70 is rotatable. Therefore, while the front handle 70 is configured to be rotatable, the protection of the battery BAT by the front handle 70 can be enhanced. Further, the rotation position of the front handle 70 can be adjusted to a position where the battery BAT is desired to be protected, and the protection of a desired position of the battery BAT can be enhanced.

[0098] According to the belt sander 100 according to the present embodiment, the attachment / detachment operation portion 78 is switchable between a rotation suppression state for suppressing the rotation of the front handle 70 and a rotation state for making the front handle 70 rotatable. Therefore, the rotation position of the front handle 70 can be changed by a simple operation using the attachment / detachment operation portion 78.

[0099] According to the belt sander 100 according to the present embodiment, the shaft engagement portion 762 is configured to engage with the connection engagement portion 732 at a predetermined restriction position RP of the shaft portion 76 when the shaft portion 76 moves in the second direction DX2. Therefore, when the attachment / detachment operation portion 78 is operated and the shaft portion 76 moves in the second direction DX2, it is possible to suppress or prevent the attachment / detachment operation portion 78 and the shaft portion 76 from falling off from the front handle 70 and the housing 60.

[0100] According to the belt sander 100 according to the present embodiment, when the claw portion 732a is locked to the shaft recess 762a at the regulation position RP, the movement of the shaft portion 76 in the second direction DX2 is restricted. Without adding new dedicated parts, a mechanism for preventing the shaft portion 76 from falling off can be formed by changing the shapes of the first connecting portion 73 and the shaft portion 76. Therefore, an increase in the number of parts of the belt sander 100 can be suppressed or prevented.

[0101] According to the belt sander 100 according to the present embodiment, the first side surface portion 63 includes a restraint portion 634 that can accommodate the claw portion 732a in a state of being engaged with the shaft recess 762a at the regulation position RP in a state of contacting the outer surface of the claw portion 732a. Therefore, it is possible to more reliably suppress or prevent the detachment operation portion 78 and the shaft portion 76 from falling off from the front handle 70 and the housing 60.

[0102] According to the belt sander 100 according to the present embodiment, the second extension portion 72 includes a first portion 721 extending from the connection position with the housing 60 and a second portion 722 bent from the first portion 721 toward the second gripping portion 77. The second portion 722 is disposed inside the second gripping portion 77. By adopting a structure in which the second portion 722 overlaps with the second gripping portion 77, the rigidity of the front handle 70 can be improved, and the strength of the front handle 70 can be improved.

[0103] According to the belt sander 100 according to the present embodiment, when the first extension portion 71 is formed using a synthetic resin and the second extension portion 72 is formed using a metal, the drive transmission portion 50 is provided on the first side surface portion 63. By disposing the metal second extension portion 72, which is likely to be heavy, on the side opposite to the drive transmission portion 50, which is likely to be heavy, it becomes easy to equalize the weight of the entire belt sander 100.

[0104] According to the belt sander 100 according to the present embodiment, at least a part of the second gripping portion 77 can be fixed to a position R1 flush with the upper surface portion 62 by the rotation of the front handle 70. When performing a machining operation in the second usage mode with the polishing surface FS of the belt sander 100 facing upward, the belt sander 100 can be supported by the upper end 77T of the second gripping portion 77 and the upper surface portion 62. Therefore, the workability of the user can be improved compared to the case where the belt sander 100 is supported only by the upper surface portion 62.

[0105] According to the belt sander 100 according to the present embodiment, the extending direction DC of the first gripping portion 82 is inclined at an inclination angle of 30 degrees or more and 50 degrees or less with respect to the surface direction of the polishing surface FS so that the upper side of the first gripping portion 82 is closer to the back surface portion 66 than the lower side of the first gripping portion 82 in a side view of the belt sander 100. The user can easily execute both a first operation of gripping the main handle 80 and pressing the polishing surface FS against the object to be machined, and a second operation of moving the belt sander 100 to change the machining position, thereby improving the workability of the belt sander 100.

[0106] According to the belt sander 100 according to the present embodiment, at least a part of the battery mounting portion 30 overlaps at least a part of the polishing surface FS in a top view of the belt sander 100. When the battery BAT is mounted on the battery mounting portion 30, the load of the battery BAT can be applied to the polishing surface FS by utilizing gravity. Therefore, the weight of the battery BAT can be utilized for pressing the polishing surface FS, and the workability of the belt sander 100 can be improved.

[0107] According to the belt sander 100 according to the present embodiment, a light emitting portion 90 is provided on the surface of the housing 60. The light emitting portion 90 is configured to be able to switch the optical axis to a first irradiation direction LD1 that intersects the surface direction of the polishing surface FS and a second irradiation direction LD2 that does not intersect the surface direction of the polishing surface FS. The user can change the irradiation direction of the light emitting portion 90 according to the usage form of the belt sander 100 or the rotational position of the front handle 70, etc., and can improve the workability of the belt sander 100.

[0108] According to the belt sander 100 according to the present embodiment, the cross-sectional width W2 of the second extension portion 72 is narrower than the cross-sectional width W1 of the first extension portion 71. Therefore, for example, even when performing a polishing operation using the belt sander 100 on a workpiece having a processed surface and a wall surface adjacent to the processed surface, it becomes easy to bring the second side surface portion 64 of the housing 60 closer to the wall surface while polishing the processed surface, and it becomes easy to perform a polishing operation near the wall surface.

[0109] B. Second Embodiment: The configuration of the belt sander 100 according to the second embodiment will be described with reference to FIGS. 17 and 18. The belt sander 100 of the second embodiment is different from the first embodiment in that it includes a shaft portion 76b instead of the shaft portion 76, a first connecting portion 73b instead of the first connecting portion 73, and a first side surface portion 63b instead of the first side surface portion 63, and the other configurations are the same.

[0110] The shaft portion 76b is different from the shaft portion 76 shown in the first embodiment in the configuration of the shaft engaging portion 762. Specifically, the shaft portion 76b is different from the shaft portion 76 in that it includes a ring 762b instead of the shaft recess 762a and further includes a fixing recess 764. The ring 762b is a so-called O-ring. The fixing recess 764 is a recess formed at the regulation position RP and is formed with a smaller shaft diameter than other portions of the shaft portion 76b. The fixing recess 764 receives the ring 762b and fixes the ring 762b. The depth of the fixing recess 764 is formed to be shallower than the diameter of the ring 762b. Therefore, the ring 762b fixed to the fixing recess 764 protrudes from the surface of the shaft portion 76b. As a result, the ring 762b functions as a shaft engaging portion 762 having a convex shape with respect to the surface of the shaft portion 76b. The arrangement position of the ring 762b substantially coincides with the regulation position RP. Instead of the ring 762b, the shaft portion 76b may be formed with a larger shaft diameter than other portions, and thus may include a convex portion protruding from the surface of the shaft portion 76b. Even with such a configuration, similar to the ring 762b, the convex portion can function as a shaft engaging portion 762 having a convex shape with respect to the surface of the shaft portion 76b.

[0111] The first side surface portion 63b is different from the first side surface portion 63 shown in the first embodiment in that it includes a sliding seat winding portion 636 instead of the restraining portion 634. The sliding seat winding portion 636 defines a space for preventing the ring 762b from contacting the first side surface portion 63b when the shaft portion 76b slides in the first direction DX1 and the second direction DX2.

[0112] The first connecting portion 73b is different from the first connecting portion 73 shown in the first embodiment in the configuration of the connecting and engaging portion 732. Specifically, the first connecting portion 73b is different from the first connecting portion 73 in that it includes a counterbore portion 732b instead of the claw portion 732a. The counterbore portion 732b is a recess provided around a through-hole for inserting the shaft portion 76b and at a position facing the first side surface portion 63b. As shown in FIG. 18, the counterbore portion 732b receives a portion of the ring 762b provided on the shaft portion 76b that protrudes from the surface of the shaft portion 76b. The counterbore portion 732b functions as a connecting and engaging portion 732 having a concave shape. When the counterbore portion 732b engages with the ring 762b at the regulation position RP, the movement of the shaft portion 76 in the second direction DX2 is regulated.

[0113] As in the belt sander 100 according to the present embodiment, it is also possible to form a detachment prevention mechanism by a connecting and engaging portion 732 having a concave shape and a shaft engaging portion 762 having a convex shape. When the counterbore portion 732b engages with the ring 762b as a shaft convex portion at the regulation position RP, the movement of the shaft portion 76b in the second direction DX2 is regulated. Therefore, when the attachment / detachment operation portion 78 is operated and the shaft portion 76b moves in the second direction DX2, it is possible to suppress or prevent the attachment / detachment operation portion 78 and the shaft portion 76b from detaching from the front handle 70 and the housing 60.

[0114] The present disclosure is not limited to the above-described embodiments, and can be realized in various configurations without departing from the gist thereof. For example, the technical features in the embodiments corresponding to the technical features in each form described in the summary of the invention can be appropriately replaced or combined in order to solve some or all of the above-described problems or to achieve some or all of the above-described effects. Further, if the technical feature is not described as essential in this specification, it can be appropriately deleted.

Explanation of Reference Numerals

[0115] 20…Motor, 30…Battery mounting part, 32…Guide rail, 34…Terminal, 40…Belt drive part, 42…Drive roller, 44…Driven roller, 46…Sanding belt, 48…Support frame, 50…Drive transmission part, 60…Housing, 61…Bottom part, 62…Upper surface part, 63, 63b…First side surface part, 63S…Cam surface, 64…Second side surface part, 64S…Cam surface, 65…Motor housing part, 66…Rear surface part, 67…Front surface part, 70…Front handle (second handle), 71…First extension part, 72…Second extension part, 73, 73b…First connecting part, 73E…End face, 73S…Cam surface, 73T…Through hole, 74…Second connecting part, 74S…Cam surface, 76…Shaft part, 76b…Shaft part, 77…Second gripping part, 77T…Upper end, 78…Detachment operation part, 78E…End face, 80…Main handle (first handle), 80B…Back surface, 82…First gripping part, 83…Lock-off trigger, 84…Switch trigger, 85…Lock-on button, 86…Upper base part, 88…Lower base part, 89…Dial, 90…Light-emitting part, 100…Belt sander, 202…Motor body, 204…Shaft, 482…Plate, 502…Pulley, 504…Toothed belt, 506…Gear mechanism, 632…First connecting recess, 634…Restraint part, 636…Sliding seat turning part, 642…Second connecting recess, 721…First part, 721E…Tip, 721H…Through hole, 722…Second part, 73E1…Restriction surface, 732…Connecting engagement part, 732a…Claw part, 732b…Turning part, 742…Male screw part, 744…Female screw part, 746…Fixture, 76E1…One end, 762…Shaft engagement part, 762a…Shaft recess, 762b…Ring, 764…Fixing recess, 782…Biasing member, 842…Trigger body, 844…Trigger surface, 844B…Lower end part, 844L…Straight line, 844T…Upper end part, 846…Trigger bottom part, 846c…Contact point, 73E2…Inclined surface, 76E2…Other end, 762E1…One end, 73E3…Back surface, 762E2…Other end, BAT…Battery, BE…Front end face, Bb…Back surface, Bt…Upper surface, CR…Gap, DB…Dust box, DC, DC2, DC3…Extension direction, DX1…First direction, DX2…Second direction, E1…First restriction part, E2…Second restriction part, FS…Polishing surface, XM…Rotation axis, HZ…Horizontal plane, LD1…First irradiation direction, LD2…Second irradiation direction, RP…Restriction position, SD…Surface direction, SP…Space, SW…Switch mechanism, TE…Upper end surface, XC…Cross-section center, XH…Rotation axis, XR1…Roller rotation axis, XR2…Driven rotation axis

Claims

1. A belt sander, comprising: a motor driven by electric power supplied from a battery; a battery mounting portion for detachably mounting the battery; a belt drive portion including a drive roller rotated by the driving force of the motor, a driven roller, and a belt stretched between the drive roller and the driven roller and functioning as a polishing surface for polishing an object to be processed; a housing having a motor housing portion for housing the motor; a handle disposed so as to surround at least a part of the battery mounted on the battery mounting portion. The belt sander.

2. The belt sander according to claim 1, wherein the housing further includes a bottom portion on which the belt drive portion is disposed, an upper surface portion opposite to the bottom portion, a first side surface portion located between the bottom portion and the upper surface portion, and a second side surface portion opposite to the first side surface portion; the handle includes a first extension portion connected to the first side surface portion, a second extension portion connected to the second side surface portion, and a gripping portion connecting the first extension portion and the second extension portion; the first extension portion and the second extension portion overlap at least a part of the battery mounted on the battery mounting portion in a side view of the belt sander. The belt sander.

3. The belt sander according to claim 2, wherein the handle further includes furthermore, a first connecting portion for rotatably connecting the first extension portion to the first side surface portion; a second connecting portion for rotatably connecting the second extension portion to the second side surface portion; the handle rotates within a predetermined range of rotation angles; the first extension portion and the second extension portion overlap at least a part of the battery mounted on the battery mounting portion in a side view of the belt sander regardless of the rotational position of the handle within the range. The belt sander.

4. The belt sander according to claim 3, wherein the handle further includes a detaching / attaching operation portion for moving the first connecting portion in a first direction toward the first side surface portion and a second direction away from the first side surface portion along the rotation axis of the handle. The attachment / detachment operation portion can switch the state of the handle between a rotation suppression state in which the rotation of the handle is suppressed by moving in the first direction and sandwiching the first connecting portion between the attachment / detachment operation portion and the first side surface portion, and a rotation state in which the handle can be rotated by moving in the second direction and separating the first connecting portion from the first side surface portion. Belt sander.

5. The belt sander according to claim 4, further comprising a shaft portion that is inserted through the first connecting portion and the second connecting portion and defines the rotation axis of the handle, wherein the first connecting portion includes a connecting engagement portion having a convex shape or a concave shape, the shaft portion includes a shaft engagement portion having a concave shape or a convex shape corresponding to the connecting engagement portion, the attachment / detachment operation portion is fixed to an end portion of the shaft portion and is movable in the first direction and the second direction, when the shaft portion moves in the second direction and reaches a predetermined restriction position, further movement in the second direction is restricted due to the engagement between the shaft engagement portion and the connecting engagement portion. Belt sander.

6. The belt sander according to claim 5, wherein the connecting engagement portion is a claw portion having a convex shape that protrudes toward the shaft portion on a wall surface of a through hole through which the shaft portion is inserted in the first connecting portion, the shaft engagement portion is a shaft concave portion having a concave shape with a smaller shaft diameter than other portions of the shaft portion, when the claw portion is locked to the shaft concave portion at the restriction position, movement of the shaft portion in the second direction is restricted. Belt sander.

7. The belt sander according to claim 6, wherein the first side surface portion includes a restraint portion that can accommodate the claw portion in a state of being engaged with the shaft concave portion at the restriction position in contact with the outer surface of the claw portion. Belt sander.

8. The belt sander according to claim 5, wherein the first connecting portion has a concave shape at a position facing the first side surface portion and includes a counterbore portion that functions as the connecting engagement portion, the shaft portion has a convex shape with a larger shaft diameter than other portions of the shaft portion and includes a shaft convex portion that functions as the shaft engagement portion, when the counterbore portion engages with the shaft convex portion at the restriction position, movement of the shaft portion in the second direction is restricted. Belt sander.

9. The belt sander according to claim 8, wherein the shaft convex portion is an O-ring fixed to the shaft portion.

10. The belt sander according to claim 2, Either one of the first extension part and the second extension part and the gripping part are integrally formed using a synthetic resin, The other extension part different from the one extension part is formed using a metal, The other extension part includes a first part extending from a connection position with the housing and a second part bent from the first part toward the gripping part, The second part is disposed inside the gripping part, Belt sander.

11. The belt sander according to claim 2, Further comprising a drive transmission part for transmitting the driving force of the motor to the drive roller, The first extension part is formed using a synthetic resin, The second extension part is formed using a metal, The drive transmission part is provided on the first side surface part, Belt sander.

12. The belt sander according to claim 3, At least a part of the gripping part can be fixed at a position flush with the upper surface part by rotation of the handle, Belt sander.

13. The belt sander according to claim 2, Further, the handle surrounding the battery is defined as a second handle, and an upper base connected to a position close to the upper surface part of the back surface part located on the opposite side of the second handle across the motor housing part in the housing, a lower base connected to a position close to the belt drive part in the back surface part, and a first handle having a first gripping part extending and connecting the upper base and the lower base are provided, The extending direction of the first gripping part is inclined at a predetermined inclination angle with respect to the surface direction of the polishing surface such that the upper side of the first gripping part is closer to the back surface part than the lower side of the first gripping part in a side view of the belt sander, The inclination angle is 30 degrees or more and 50 degrees or less, Belt sander.

14. The belt sander according to claim 13, The first handle further includes a switch trigger provided at a position facing the back surface part in the first gripping part for switching on and off the motor, The switch trigger includes a trigger body and a trigger surface against which a user places a finger when operating the trigger body, The extending direction is defined by a tangent line of the first handle at an intersection point where a perpendicular bisector of a straight line connecting an upper end portion and a lower end portion, which are exposed outside the belt sander when the switch trigger is not operated, of the trigger surface intersects with the back surface of the first handle, in a side view of the belt sander. Belt sander.

15. The belt sander according to claim 13, wherein the first handle further includes a switch trigger provided at a position facing the back surface portion of the first gripping portion, the switch trigger includes a trigger body having a trigger bottom portion having an arc shape in a side view of the belt sander, and a trigger surface against which a user places a finger when operating the trigger body, the extending direction is defined by a tangent line of the first handle at an intersection point where a tangent line that contacts the trigger bottom portion when the switch trigger is not operated, among straight lines including a roller rotation axis that is a rotation axis of a roller closer to the first handle among the drive roller and the driven roller, intersects with the back surface of the first handle, in a side view of the belt sander. Belt sander.

16. The belt sander according to claim 13, wherein the extending direction is defined by a tangent line of the first handle at an intersection point where a straight line, in which an acute angle with a surface direction of the polishing surface is 55 degrees, among straight lines including a roller rotation axis that is a rotation axis of a roller closer to the first handle among the drive roller and the driven roller, intersects with the back surface of the first handle, in a side view of the belt sander. Belt sander.

17. The belt sander according to claim 2, further comprising a first handle having an upper base portion connected to a position close to an upper surface portion among back surface portions of the housing that are located on the opposite side of the second handle across the motor housing portion, a lower base portion connected to a position close to the belt driving portion among the back surface portions, and a first gripping portion that extends and connects the upper base portion and the lower base portion, and a switch trigger provided at a position facing the back surface portion of the first gripping portion, in a side view of the belt sander, a normal line to the extending direction of the first gripping portion, which passes through a position on the opposite side of the switch trigger of the first gripping portion, passes between a rotation axis of the drive roller and a rotation axis of the driven roller. Belt sander

18. The belt sander according to claim 17, wherein the normal line intersects the polishing surface in a side view of the belt sander, Belt sander

19. The belt sander according to claim 1, wherein in a top view of the belt sander, at least a part of the battery mounting portion overlaps at least a part of the polishing surface, Belt sander

20. The belt sander according to claim 1, further comprising a light emitting portion disposed on the surface of the housing and capable of irradiating light, wherein the light emitting portion can switch the optical axis of the light to a first irradiation direction intersecting the surface direction of the polishing surface and a second irradiation direction not intersecting the surface direction of the polishing surface, Belt sander

21. A belt sander, a motor driven by electric power supplied from a battery, a battery mounting portion for detachably mounting the battery, a belt drive portion including a drive roller rotated by the driving force of the motor, a driven roller, and a belt that is stretched between the drive roller and the driven roller and functions as a polishing surface for polishing an object to be processed, a housing having a bottom portion on which the belt drive portion is disposed, an upper surface portion located on the side opposite to the bottom portion, a first side surface portion connecting the bottom portion and the upper surface portion, a second side surface portion on the side opposite to the first side surface portion, and a motor housing portion for housing the motor, a handle having a first extension portion connected to the first side surface portion, a second extension portion connected to the second side surface portion, and a gripping portion connecting the first extension portion and the second extension portion, a drive transmission portion provided on the first side surface portion for transmitting the driving force of the motor to the drive roller, wherein the handle is disposed so as to surround at least a part of the battery mounted on the battery mounting portion, wherein the cross-sectional width of the second extension portion is narrower than the cross-sectional width of the first extension portion, Belt sander

22. A belt sander, a motor driven by electric power supplied from a battery, a battery mounting portion for detachably mounting the battery, a first handle, a second handle disposed so as to surround at least a part of the battery mounted on the battery mounting portion, a belt drive portion including a drive roller rotated by the driving force of the motor, a driven roller, and a belt that is stretched between the drive roller and the driven roller and functions as a polishing surface for polishing an object to be processed, A housing having a motor housing portion for housing the motor, a bottom portion where the belt drive portion is disposed, an upper surface portion opposite to the bottom portion, and a back surface portion opposite to the second handle with the motor housing portion interposed therebetween, The first handle has an upper base portion connected to a position on the back surface portion close to the upper surface portion, a lower base portion connected to a position on the back surface portion close to the belt drive portion, and a first grip portion that extends and connects the upper base portion and the lower base portion, In the extending direction of the first grip portion, in a side view of the belt sander, the upper side of the first grip portion is closer to the back surface portion than the lower side of the first grip portion, and it is inclined at a predetermined inclination angle with respect to the surface direction of the polishing surface, The inclination angle is 30 degrees or more and 50 degrees or less. Belt sander.

23. The belt sander according to claim 22, The first handle further includes a switch trigger provided at a position on the first grip portion facing the back surface portion for switching on and off the motor, The switch trigger includes a trigger body and a trigger surface against which a user places a finger when operating the trigger body, The extending direction is defined by a tangent line of the first handle at an intersection where a perpendicular bisector of a straight line connecting an upper end portion and a lower end portion of the trigger surface that is exposed outside the belt sander when the switch trigger is not operated intersects the back surface of the first handle in a side view of the belt sander, Belt sander.

24. The belt sander according to claim 22, The first handle further includes a switch trigger provided at a position on the first grip portion facing the back surface portion, The switch trigger includes a trigger body having a trigger bottom portion having an arc shape in a side view of the belt sander and a trigger surface against which a user places a finger when operating the trigger body, The extending direction is defined by a tangent line of the first handle at an intersection where a tangent line that contacts the trigger bottom portion when the switch trigger is not operated of a straight line including a roller rotation axis that is a rotation axis of the roller closer to the first handle among the drive roller and the driven roller intersects the back surface of the first handle in a side view of the belt sander, Belt sander.

25. The belt sander according to claim 22, The extending direction is, in a side view of the belt sander, among the straight lines including the roller rotation axis which is the rotation axis of the roller closer to the first handle among the driving roller and the driven roller, the straight line at an acute angle of 55 degrees with the surface direction of the polishing surface, and is defined by the tangent line of the first handle at the intersection where the straight line intersects the back surface of the first handle. Belt sander.

26. A belt sander, comprising: A motor driven by electric power supplied from a battery; A battery mounting portion for detachably mounting the battery; A first handle; A second handle disposed so as to surround at least a part of the battery mounted on the battery mounting portion; A belt drive unit including a driving roller rotated by the driving force of the motor, a driven roller, and a belt that is stretched over the driving roller and the driven roller and functions as a polishing surface for polishing an object to be processed; A motor housing for housing the motor, a bottom portion on which the belt drive unit is disposed, an upper surface portion opposite to the bottom portion, and a housing having a back surface portion opposite to the second handle with the motor housing interposed therebetween; The first handle includes an upper base portion connected to a position close to the upper surface portion of the back surface portion, a lower base portion connected to a position close to the belt drive unit of the back surface portion, a first gripping portion extending and connecting the upper base portion and the lower base portion, and a switch trigger provided at a position facing the back surface portion of the first gripping portion for switching on and off the motor. In a side view of the belt sander, the normal line to the extending direction of the first gripping portion, which passes through a position on the opposite side of the switch trigger of the first gripping portion, passes between the rotation axis of the driving roller and the rotation axis of the driven roller. Belt sander.

27. The belt sander according to claim 26, wherein The normal line intersects the polishing surface in a side view of the belt sander. Belt sander.

Images