Patent Application
20250187133
This application claims priority to Japanese patent application no. 2023-209285 filed on Dec. 12, 2023, the contents of which are fully incorporated herein by reference.
The present disclosure relates to a belt sander.
A belt sander is known that polishes a workpiece by rotating an endless sanding belt using a motor driven by power supplied from a battery. For example, Japanese Unexamined Patent Application Publication No. 2023-140560 discloses a belt sander provided with an arm connected to one side surface of a housing, and a front handle including a grip portion connected to the arm. The front handle is disposed in the vicinity of the battery, and when the belt sander is dropped, for example, an impact to the battery may be suppressed by the front handle.
However, in the known technology, protection of the battery may not be sufficient enough, and there is demand to strengthen the protection of the battery.
A belt sander according to a first aspect of the present disclosure is provided. The belt sander includes a motor driven by power supplied from a battery, a battery mounting portion to which configured to removably mount the battery is removably mountable, and a belt driving portion including (i) a drive roller rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt stretched over the drive roller and the driven roller and having a polishing surface for polishing a workpiece. The belt sander includes a housing including a motor housing portion housing the motor, and a handle disposed to surround at least a part of the battery mounted to the battery mounting portion.
According to the belt sander according to the above-described aspect, the handle surrounds at least a part of the battery mounted to the battery mounting portion. Thus, it is possible to protect the battery from an external impact or the like, such as an impact or the like to the battery when the belt sander is dropped, and protection of the battery can be strengthened.
A belt sander according to a second aspect of the present disclosure is provided. The belt sander includes a motor driven by power supplied from a battery, a battery mounting portion to which configured to removably mount the battery is removably mountable, and a belt driving portion including (i) a drive roller rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt stretched over the drive roller and the driven roller and having a polishing surface for polishing a workpiece. The belt sander includes a housing including (i) a bottom portion on which the belt driving portion is disposed, (ii) an upper surface portion on an opposite side from the bottom portion, (iii) a first side surface portion positioned between the bottom portion and the upper surface portion, (iv) a second side surface portion on an opposite side from the first side surface portion, and (v) a motor housing portion housing the motor. The belt sander includes a handle including (i) a first extension portion coupled to the first side surface portion, (ii) a second extension portion coupled to the second side surface portion, and (iii) a grip portion connecting the first extension portion and the second extension portion. The belt sander includes a drive transmitting portion that is provided at the first side surface portion and that transmits the driving force of the motor to the drive roller. The handle is disposed to surround at least a part of the battery mounted to the battery mounting portion. A cross-sectional width of the second extension portion is narrower than a cross-sectional width of the first extension portion.
According to the belt sander according to the above-described aspect, the cross-sectional width of the second extension portion is narrower than the cross-sectional width of the first extension portion. 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 is easy to cause the second side surface portion to approach the wall surface while polishing the processing surface. Thus, the polishing operation in the vicinity of the wall surface is more easily performed.
A belt sander according to a third aspect of the present disclosure is provided. The belt sander includes a motor driven by power supplied from a battery, a battery mounting portion to which configured to removably mount the battery is removably mountable, a first handle, a second handle disposed to surround at least a part of the battery mounted to the battery mounting portion, and a belt driving portion including (i) a drive roller rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt stretched over the drive roller and the driven roller and having a polishing surface for polishing a workpiece. The belt sander includes a housing including (i) a motor housing portion housing the motor, (ii) a bottom portion on which the belt driving portion is disposed, (iii) an upper surface portion on an opposite side from the bottom portion, and (iv) a back surface portion on an opposite side from the second handle with the motor housing portion interposed therebetween. The first handle includes (i) an upper base connected at a position, of the rear surface portion, close to the upper surface portion, (ii) a lower base connected at a position, of the rear surface portion, close to the belt driving portion, and (iii) a first grip portion extending between and connecting the upper base and the lower base. In a sideview of the belt sander, an extending direction of the first grip portion is inclined at a predetermined inclination angle with respect to the polishing surface, in a manner that an upper side of the first grip portion is closer to the rear surface portion than a lower side of the first grip portion. The inclination angle is in a range from 30 degrees to 50 degrees.
According to the belt sander according to the above-described aspect, it is easier for a user to apply a force pressing the belt sander against the polishing surface utilizing the first handle. Thus, the user can easily perform both an operation of pressing the polishing surface against the workpiece, and an operation of moving the belt sander in order to change a processing position, while holding the first handle.
A belt sander according to a fourth aspect of the present disclosure is provided. The belt sander includes a motor driven by power supplied from a battery, a battery mounting portion to which configured to removably mount the battery is removably mountable, a first handle, a second handle disposed to surround at least a part of the battery mounted to the battery mounting portion, and a belt driving portion including (i) a drive roller to be rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt stretched over the drive roller and the driven roller and having a polishing surface for polishing a workpiece. The belt sander includes a housing including (i) a motor housing portion housing the motor, (ii) a bottom portion on which the belt driving portion is disposed, (iii) an upper surface portion on an opposite side from the bottom portion, and (iv) a back surface portion on an opposite side from the second handle with the motor housing portion interposed therebetween. The first handle includes (i) an upper base connected at a position, of the rear surface portion, close to the upper surface portion, (ii) a lower base connected at a position, of the rear surface portion, close to the belt driving portion, (iii) a first grip portion extending between and connecting the upper base and the lower base, and (iv) a switch trigger to be manually operated for switching the motor on and off, the trigger being provided at a position, of the first grip portion, facing the rear surface portion. In a sideview of the belt sander, a normal line with respect to an extending direction of the first grip portion passes through a position (i) on an opposite side of the first grip portion from the switch trigger, and (ii) between a rotational axis of the drive roller and a rotational axis of the driven roller.
According to the belt sander according to the above-described aspect, the user can easily apply the force pressing the belt sander against the polishing surface by using the first handle. Thus, the user can easily perform both the operation of pressing the polishing surface against the workpiece, and the operation of moving the belt sander in order to change the processing position, while holding the first handle.
Hereinafter, representative and non-limiting embodiments of the present invention will be described in detail with reference to the drawings. This detailed description is simply intended to show, to a person skilled in the art, details for embodying preferable examples of the present invention, and is not intended to limit the scope of the present invention. Further, additional features and the invention disclosed below can be used separately or together with other features and inventions, in order to provide a further improved device, and a manufacturing method and usage method thereof.
Further, combinations of features and processes disclosed in the following detailed description are not essential, in broad terms, when embodying the present disclosure, and, in particular, are given for describing representative specific examples of the present disclosure. Furthermore, when presenting additional and effective embodiments of the present disclosure, various features of representative specific examples described above and below, and various features described in independent and dependent claims need not necessarily be combined as in the specific examples given here, or in a given order.
All features listed in the present specification and/or in the scope of the claims are intended to be disclosed separately, and independently of each other, as limitations to the disclosure at the time of filing and to the claimed specific items, separately to the configuration of features listed in the embodiments and/or in the scope of the claims. Furthermore, descriptions relating to all numerical ranges and groups or collections are treated as intending to disclose intermediate components thereof, as limitations to the disclosure at the time of filing and to the claimed specific items.
In one or more non-limiting embodiments, a housing may further include (i) a bottom portion on which the belt driving portion is disposed, (ii) an upper surface portion on an opposite side from the bottom portion, (iii) a first side surface portion positioned between the bottom portion and the upper surface portion, and (iv) a second side surface portion on an opposite side from the first side surface portion. The handle may include (i) a first extension portion coupled to the first side surface portion, (ii) a second extension portion coupled to the second side surface portion, and (iii) a grip portion connecting the first extension portion and the second extension portion. In a side view of the belt sander, the first extension portion and the second extension portion may overlap at least a part of the battery mounted to the battery mounting portion.
According to the belt sander according to this aspect, protection of the side surfaces of the battery can be strengthened utilizing the first extension portion and the second extension portion of the handle.
In one or more non-limiting embodiments, the handle may further include a first coupling portion rotatably coupling the first extension portion and the first side surface portion, and a second coupling portion rotatably coupling the second extension portion and the second side surface portion. The handle may be rotatable within a range of predetermined rotation angles. In a side view of the belt sander, regardless of a rotation position at which the handle is disposed within the range, the first extension portion and the second extension portion may overlap at least a part of the battery mounted to the battery mounting portion.
According to the belt sander according to this aspect, it is possible to strengthen the protection of the battery at a position desired by the user, by adjusting the rotation position of the handle.
In one or more non-limiting embodiments, the handle may further include a mounting/removal operation portion configured to move the first coupling portion in a first direction toward the first side surface portion along a rotational axis of the handle, and a second direction separating from the first side surface portion. The mounting/removal operation portion may be configured to switch a state of the handle to (i) a rotation suppressed state in which rotation of the handle is suppressed, by moving in the first direction to cause the first coupling portion to be clamped between the mounting/removal operation portion and the first side surface portion, and (ii) to a rotatable state in which the handle is rotatable, by moving in the second direction to allow the first coupling portion to be spaced apart from the first side surface portion.
According to the belt sander according to this aspect, the rotation position of the handle can be changed by a simple operation utilizing the mounting/removal operation portion.
In one or more non-limiting embodiments, the belt sander may further include a shaft portion inserted through the first coupling portion and the second coupling portion, and defining the rotational axis of the handle. The first coupling portion may include a coupling engagement portion having a protruding shape or a recessed shape. The shaft portion may include a shaft engagement portion having a recessed shape or a protruding shape corresponding to the coupling engagement portion. The mounting/removal operation portion may be fixed to an end portion of the shaft portion, and may be configured to move the shaft portion in the first direction and the second direction, and, when the shaft portion moves in the second direction and the coupling engagement portion reaches a predetermined restriction position on the shaft portion, the shaft portion may be restricted from moving further in the second direction as a result of engagement between the shaft engagement portion and the coupling engagement portion.
According to the belt sander according to this aspect, 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.
In one or more non-limiting embodiments, the coupling engagement portion may be a tab portion having a protruding shape protruding toward the shaft portion, from a wall surface of a through hole, of the first coupling portion, through which the shaft portion is inserted. The shaft engagement portion may be a shaft recess portion having a recessed shape whose shaft diameter is narrower than other sections of the shaft portion. The shaft portion may be restricted from moving in the second direction by the tab portion being engaged with the shaft recess portion when the tab portion is at the restriction position.
According to the belt sander according to this aspect, it is possible to form a mechanism for suppressing or preventing the falling off of the shaft portion by changing the shape of the first coupling portion and the shaft portion, without adding a new dedicated component. Thus, it is possible to suppress or prevent an increase in a number of components of the belt sander.
In one or more non-limiting embodiments, the first side surface portion may include a restraint portion that houses the tab portion engaged with the shaft recess portion when the tab portion is at the restriction position, in a state of being adjacent to the back surface of the tab portion.
According to the belt sander according to this aspect, it is possible to suppress or prevent the shaft portion from falling off from the handle or the housing.
In one or more non-limiting embodiments of the present disclosure, the first coupling portion may include a counterbore portion having a recessed shape at a position facing the first side surface portion, and having the coupling engagement portion. The shaft portion may include a shaft protruding portion having a protruding shape whose shaft diameter is thicker than other sections of the shaft portion, and having the shaft coupling portion. The counterbore portion may restrict the movement of the shaft portion in the second direction as a result of engagement between the counterbore portion and the shaft protruding portion at the restriction position.
According to the belt sander according to this aspect, 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.
In one or more non-limiting embodiments, the shaft protruding portion may be an O ring fixed to the shaft portion.
According to the belt sander according to this aspect, a mechanism to suppress or prevent the falling off of the shaft portion can be formed utilizing a simple component.
In one or more non-limiting embodiments, a first one of the first extension portion and the second extension portion, may be formed integrally with the grip portion, using a synthetic resin. A second one of the first extension portion and the second extension portion may be formed using metal. The second one of the extension portions may include a first section extending from a coupling position with the housing, and a second section curving from the first section toward the grip portion. The second section may be disposed inside the grip portion.
According to the belt sander according to this aspect, rigidity of the handle can be improved, and strength of the handle can thus be improved, by adopting a structure in which a part of the second extension portion is caused to overlap the grip portion.
In one or more non-limiting embodiments, the belt sander may further include a drive transmitting portion that transmits the driving force of the motor to the drive roller. The first extension portion may be formed using a synthetic resin. The second extension portion may be formed using metal. The drive transmitting portion may be provided at the first side surface portion.
According to the belt sander according to this aspect, by disposing the second extension portion made of metal, whose weight is likely to be greater than that of the first extension portion, on the opposite side from the drive transmitting portion whose weight is likely to be greater, the weight balance of the overall belt sander is more easily made uniform.
In one or more non-limiting embodiments, the handle may be configured to be fixed at a position such that at least a part of the grip position is in the same plane as the upper surface portion.
According to the belt sander according to this aspect, when performing an operation in which the polishing surface of the belt sander is oriented upward, it is possible to multiply support the belt sander utilizing at least a part of the grip portion and an upper end. Thus, compared to a case in which the belt sander is supported only by the upper end, it is possible to improve operability of the belt sander.
In one or more non-limiting embodiments, when the handle surrounding at least a part of the battery is a second handle, the belt sander may further include a first handle including (i) an upper base connected at a position, of a back surface portion, close to the upper surface portion, (ii) a lower base connected at a position, of the rear surface portion, close to the belt driving portion, and (iii) a first grip portion extending between and connecting the upper base and the lower base, the rear surface portion being positioned on an opposite side from the second handle with the motor housing portion interposed therebetween. In a side view of the belt sander, an extending direction of the first grip portion may be inclined at a predetermined inclination angle with respect to a surface direction of the polishing surface, in a manner that an upper side of the first grip portion is closer to the rear surface portion than a lower side of the first grip portion. The inclination angle may be in a range from 30 degrees to 50 degrees.
According to the belt sander according to this aspect, the user can easily perform both an operation of pressing the polishing surface against the workpiece and an operation of moving the belt sander in order to change a processing position, while holding the first handle.
In one or more non-limiting embodiments, the first handle may further include a switch trigger to be manually operated for switching the motor on and off, the switch trigger being provided at a position, of the first grip portion, facing the rear surface portion. The switch trigger may include a trigger main body having a trigger surface to be touched by a finger of a user during operation of the trigger main body. In a side view of the belt sander, the extending direction may be defined by a tangent line of the first handle at an intersection point between a back surface of the first handle and a bisector, the bisector being perpendicular to a straight line joining an upper end and a lower end of the trigger surface exposed to the outside of the belt sander when the switch trigger is not being operated.
In one or more non-limiting embodiments, the first handle may further include a switch trigger, provided at a position, of the first grip portion, facing the rear surface portion. The switch trigger may include a trigger main body having (i) a trigger bottom portion having a circular arc shape in a side view of the belt sander, and (ii) a trigger surface to be touched by a finger of a user during operation of the trigger main body. In a side view of the belt sander, the extending direction is defined by a first tangent line of the first handle at an intersection point between a back surface of the first handle and a second tangent line of the trigger bottom portion when the switch trigger is not being operated, the second tangent line passing through a rotational axis of a first one of the drive roller and the driven roller, the first one being closer to the first handle than a second one of the drive roller and the driven roller.
In one or more non-limiting embodiments, in a side view of the belt sander, the extending direction may be defined by a tangent line of the first handle at an intersection point between a back surface of the first handle and a straight line, the straight line (i) passing through a rotational axis of a first one of the drive roller and the driven roller and (ii) forming an acute angle of 55 degrees with the polishing surface, the first one being closer to the first handle than a second one of the drive roller and the driven roller.
In one or more non-limiting embodiments, when the handle surrounding at least a part of the battery is a second handle, the belt sander may further include a first handle including an upper base connected at a position, of a back surface portion, close to the upper surface portion, a lower base connected at a position, of the rear surface portion, close to the belt driving portion, a first grip portion extending between and connecting the upper base and the lower base, and a switch trigger provided at a position of the first grip position, facing the rear surface portion, the rear surface portion being positioned on an opposite side from the second handle with the motor housing portion interposed therebetween. In a side view of the belt sander, a normal line with respect to an extending direction of the first grip portion may pass through a position (i) on an opposite side, of the first grip portion, from the switch trigger, and (ii) between a rotational axis of the drive roller and a rotational axis of the driven roller.
According to the belt sander according to this aspect, it is easier for a user to apply a force pressing the belt sander against the polishing surface utilizing the first handle. Thus, the user can easily perform both the operation of pressing the polishing surface against the workpiece while holding the first handle, and the operation of moving the belt sander in order to change the processing position.
In one or more non-limiting embodiments, in a side view of the belt sander, the normal line may intersect the polishing surface.
According to the belt sander according to this aspect, it is easier for a user to apply a force pressing the belt sander against the polishing surface. Thus, the user can easily perform both the operation of pressing the polishing surface against the workpiece and the operation of moving the belt sander in order to change the processing position, while holding the first handle.
In one or more non-limiting embodiments, in a plan 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 according to this aspect, it is possible to utilize the weight of the battery mounted to the battery mounting portion for pressing the polishing surface, and the operability of the belt sander can be improved.
In one or more non-limiting embodiments, the belt sander may further include a light-emitting portion disposed at a surface of the housing and configured to irradiate light. The light-emitting portion may be configured to switch an optical axis of the light between a first irradiation direction intersecting a 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 according to this aspect, the user can adjust a light irradiation direction of the light-emitting portion to match a rotation position of a second handle, and the operability of the belt sander can thus be improved.
A belt sander 100 that is an embodiment of the present disclosure will be described. As shown in
A user can use the belt sander 100 by switching as desired between a first use mode and a second use mode. The first use mode is a mode in which the belt sander 100 is held by the user and operated, and the working operation is performed by causing the polishing surface FS to come into contact with the workpiece. In the first use mode, for example, the user holds the main handle 80 and the front handle 70, and processes a desired location by moving the belt sander 100 while pressing the polishing surface FS against the workpiece. The second use mode is a mode in which the working operation is performed by pressing the workpiece against the belt sander 100 that is in a placed state. More specifically, the belt sander 100 is inverted in an up-down direction from the state shown in
The belt driving portion 40 includes a drive roller 42, a driven roller 44 disposed to one side with respect to the drive roller 42, and a support frame 48 (refer to
Hereinafter, for convenience of explanation, a direction in which the drive roller 42 and the driven roller 44 are arrayed is defined as a “front-rear direction” of the belt sander 100. A side on in which the drive roller 42 is located with respect to the driven roller 44 is defined as a “rear side”, and the opposite side on which the driven roller 44 is located with respect to the drive roller 42 is defined as a “front side”. An axial direction of the roller rotational axis XR1 of the drive roller 42 is defined as a “left-right direction” of the belt sander 100. A direction orthogonal to the front-rear direction and the left-right direction is defined as the “up-down direction” of the belt sander 100. Of the up-down direction, the direction approaching the polishing surface FS from a predetermined position of the belt sander 100 is defined as a “downward direction”, and the reverse direction thereto is defined as an “upward direction”. In the present disclosure, examples are given in which, when the polishing surface FS is placed on a horizontal surface, the perpendicular direction thereto and the up-down direction coincide with each other.
The housing 60 is a casing that houses a microcomputer (not shown in the drawings) that performs overall control of each of the components of the belt sander 100, the motor 20, and the like. The housing 60 includes a bottom portion 61, an upper surface portion 62 on an opposite side from the bottom portion 61, a first side surface portion 63 positioned between the bottom portion 61 and the upper surface portion 62, a second side surface portion 64 positioned between the bottom portion 61 and the upper surface portion 62, a motor housing portion 65 housing the motor 20, a back 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 a portion, of the housing 60, positioned on the opposite side from the first side surface portion 63, and connecting the bottom portion 61 and the motor housing portion 65. A surface direction of the first side surface portion 63 and the second side surface portion 64 intersects (more specifically, is substantially orthogonal to) the roller rotational axis XR1 of the drive roller 42, and each of the first side surface portion 63 and the second side surface portion 64 is a substantially flat surface that is long in the front-rear direction. In the present disclosure, the first side surface portion 63 is positioned on the left side of the housing 60, and the second side surface portion 64 is positioned on the right side of the housing 60.
The bottom portion 61 is a portion on the lower side of the housing 60. The bottom portion 61 holds (supports) the belt driving portion 40 such that the polishing surface FS is exposed to the outside. The upper surface portion 62 is the surface on the upper side of the housing 60. The upper surface portion 62 is a flat surface that is substantially orthogonal to the up-down direction and is substantially parallel to the polishing surface FS. In the present embodiment, the upper surface portion 62 is aligned 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 the flat surface shape, it is easy to place the belt sander 100 in the second use mode that has been inverted in the up-down direction from the state shown in
Of the housing 60, the front surface portion 67 is a portion in the vicinity of the driven roller 44 and the front handle 70. The front surface portion 67 is positioned between the battery mounting portion 30 and the belt driving portion 40. The front surface portion 67 is substantially parallel to the roller rotational axis XR1 of the drive roller 42, and has a substantially flat surface shape that is long in the left-right direction.
Of the housing 60, the rear surface portion 66 is a portion in the vicinity of the drive roller 42, and is positioned on the opposite side from the front handle 70 with the motor housing portion 65 interposed therebetween. The rear surface portion 66 is positioned between the bottom portion 61 and the upper surface portion 62, and has a substantially flat surface shape that is long in the up-down direction.
The motor housing portion 65 is a casing having a substantially cuboid external shape. As will be described below, the motor housing portion 65 houses the motor 20. A battery BAT that supplies power to the motor 20 is disposed to the front of the motor housing portion 65. In the present disclosure, a rechargeable battery having a known configuration is used as the battery BAT. Note that a size of the battery BAT can be switched as desired in accordance with a weight, an output, a drive time period or the like required for the belt sander 100. In the present embodiment, the battery BAT will be described using the general size battery BAT that can be removably mounted to the battery mounting portion 30, irrespective of a rotation position of the front handle 70 to be described later.
As shown in
As shown in
As shown in
In the present embodiment, as will be described later, the second extension portion 72 is coupled to the second side surface portion 64 via a second coupling portion 74. The second coupling portion 74 is a component for coupling the second extension portion 72 to be rotatable around a rotational axis XH with respect to the second side surface portion 64. The first extension portion 71 is coupled to the first side surface portion 63 via a first coupling portion 73 (refer to
As shown in
The upper base 86 is a portion connected to the rear surface portion 66 at a position close to the upper surface portion 62, namely, in the vicinity of the upper end of the rear surface portion 66, and protrudes rearward from the rear surface portion 66. The lower base 88 is a portion connected to the rear surface portion 66 at a position close to the belt driving portion 40, namely, in the vicinity of the lower end of the rear surface portion 66, and protrudes rearward from the rear surface portion 66. The first grip portion 82 is a component connecting the upper base 86 and the lower base 88, and has a substantially cylindrical shape extending in the up-down direction. The first grip portion 82 is gripped by the user when using the belt sander 100.
In this way, the main handle 80 extends rearward from the rear surface portion 66 of the housing 60 and curves in the up-down direction, extends in the up-down direction and curves forward, and extends toward the rear surface portion 66. In other words, the main handle 80 is configured to form an annular shape. By being configured in the annular shape, a space SP between the main handle 80 and the rear surface portion 66 is defined for inserting fingers when the user grips the main handle 80.
The switch mechanism SW switches between driving and stopping the motor 20 in response to a manual operation by the user. As shown in
The switch trigger 84 is provided at a position, of the first grip portion 82, facing the rear surface portion 66. The switch trigger 84 is a so-called momentary switch. The switch trigger 84 includes a trigger main body 842. A trigger surface 844 is a portion, of the trigger main body 842, that is touched by the user when the manual operation is performed by the user. The lock-off trigger 83 is provided at the trigger surface 844. A trigger bottom portion 846 is a lower portion of the trigger main body 842 and has a substantially circular arc shape in a side view of the belt sander 100, and. In a state of gripping the first grip portion 82, the user places their finger on the trigger surface 844, for example, and presses the trigger main body 842 toward the first grip portion 82. As a result, the motor 20 is driven, and the belt sander 100 is switched to an on state. Before the belt sander 100 is operated, the switch trigger 84 is disposed in the initial state by a biasing member (not shown in the drawings). Note that, in the present specification, the “side view of the belt sander 100” means a state in which the belt sander 100 is viewed along the roller rotational axis XR1 of the drive roller 42.
The lock-off trigger 83 is a so-called momentary switch. The lock-off trigger 83 has a protruding shape protruding from the trigger surface 844. The lock-off trigger 83 has a function of restricting a pressing operation of the switch trigger 84. This function is a function that maintains the off state of the switch trigger 84, and is also referred to as a “lock-off function”. The lock-off trigger 83 is maintained in the initial state by the biasing member (not shown in the drawings). The user can press the lock-off trigger 83 by applying a predetermined force to the lock-off trigger 83 in the initial state, and can thus release the lock-off function. In other words, the user can switch the belt sander 100 to the on state by pressing in the trigger main body 842 while operating (pressing) the lock-off trigger 83 with the finger placed on the trigger surface 844, thus releasing the lock-off function.
The lock-on button 85 is configured as a so-called momentary-type lock button. The lock-on button 85 has a function to maintain the on state of the belt sander 100. Specifically, when a pressing operation of the lock-on button 85 is performed in the state in which the trigger main body 842 is being pressed, the trigger main body 842 is fixed in the state of being pressed. This function is a function to maintain the on state of the switch trigger 84 and is also referred to as a “lock-on function”. The lock-on button 85 returns to an initial position as a result of the switch trigger 84 being pressed once more, and the lock-on function is released. The dial 89 is provided to be exposed to the upper base 86. By performing a rotation operation of the dial 89, the user can adjust a rotation speed per unit time of the motor 20.
As shown in
In the present embodiment, as shown in
When the belt sander 100 is used in the first use mode, for example, the user grips the main handle 80, and performs a first operation of pressing the polishing surface FS against the workpiece, and a second operation of moving the belt sander 100 in order to change a processing position. The extending direction DC can be considered to be a parameter having an influence on the operability of the belt sander 100 by the user. For example, if the extending direction DC is perpendicular, or close to perpendicular, to the polishing surface FS, specifically, if the inclination angle θ1 is in a range from 60 degrees to 90 degrees, although the second operation by the user becomes easier, it becomes harder to press the polishing surface FS against the workpiece, and the overall operability of the belt sander 100 deteriorates. Further, for example, if the extending direction DC is parallel, or close to parallel, to the polishing surface FS, specifically, if the inclination angle θ1 is in a range from zero degrees to 20 degrees, although the first operation becomes easier, it becomes harder to move the belt sander 100, and the overall operability of the belt sander 100 deteriorates.
In the present embodiment, the extending direction DC with respect to the polishing surface FS is set such that the inclination angle θ1 is 37.5 degrees. In this case, a normal line NM1 with respect to the extending direction DC at the intersection point CP extends in a direction toward the polishing surface FS. More specifically, the normal line NM1 passes between the roller rotational axis XR1 and the driven rotational axis XR2, and further, intersects the polishing surface FS at an intersection point CF1. Thus, the user can easily press the belt sander 100 toward the polishing surface FS in a state of gripping the main handle 80. As a result, according to the belt sander 100 configured in this manner, the user can favorably execute both the first operation and the second operation, and the operability of the belt sander 100 can be improved. Note that the inclination angle θ1 is not limited only to being 37.5 degrees and may be set as desired. However, from the point of view of improving the operability of the belt sander 100, a lower limit value of the inclination angle θ1 is preferably equal to or greater than 20 degrees, and is more preferably equal to or greater than 30 degrees. Further, an upper limit value of the inclination angle θ1 is preferably equal to or less than 60 degrees, and is more preferably equal to or less than 50 degrees.
As shown in
In the example shown in
Further, as shown in
As shown in
As shown in
As shown in
The motor 20 may be provided with a fan. For example, the fan can function to cool the motor 20, and to collect the dust into the dust box DB as a dust-collecting fan, or the like. For example, the fan is fixed on the shaft 204, between the motor body 202 and one of the bearings, and rotates together 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 driving portion 40 by the working operation into the housing 60 and discharging the dust to the dust box DB.
As shown in
The configuration of the front handle 70 provided in the belt sander 100 according to the present embodiment will be described with reference to
As shown in
In the present embodiment, the metal second extension portion 72 is disposed on the second side surface portion 64 on the opposite side from the first side surface portion 63 at which the drive transmitting portion 50 is disposed. According to this type of configuration, it is possible to dispose the second extension portion 72 whose mass is likely to be greater than that of the first extension portion 71 on the opposite side from the drive transmitting portion 50 whose mass is likely to be large. Thus, compared to a case in which the second extension portion 72 is formed of the synthetic resin and the first extension portion 71 is formed of the metal, a weight balance of the overall belt sander 100 is more easily made uniform.
A cross-sectional width W1 of the first extension portion 71 and a cross-sectional width W2 of the second extension portion 72 are shown in
The second grip portion 77 is used for the user to grip using one hand when using the belt sander 100. In the present embodiment, the second grip portion 77 is formed integrally with the first extension portion 71. In other words, the material of the second grip portion 77 is the same as that of the first extension portion 71. However, the second grip portion 77 may be formed using a desired material. Further, the second grip portion 77 may be formed using a different material from that of the first extension portion 71, or may be formed separately from the first extension portion 71.
The second extension portion 72 includes a first section 721 and a second section 722. Of the second extension portion 72, the first section 721 is a section extending from the coupling position with the housing 60 toward the outside of the belt sander 100. The second section 722 is a section, curving toward the second grip portion 77 from a distal end 721E of the first section 721 on the opposite side from the coupling position with the housing 60. As shown in
Surrounding the battery BAT, the front handle 70 is continually provided to extend toward the front from the left side surface of the housing 60 (the left side of the battery mounting portion 30), curve at the front of the belt sander 100 (the front of the battery mounting portion 30), and extend as far as the right side surface of the housing 60 (the right side of the battery mounting portion 30). In this way, the belt sander 100 according to the present embodiment is configured such that an arrangement position of the front handle 70 surrounds at least a part of the battery BAT mounted to the battery mounting portion 30. The battery BAT can be protected from impact or the like as a result of the front handle 70 surrounding the battery BAT. T. Whether or not the front handle 70 is surrounding at least part of the battery BAT can be determined, for example, based on whether or not the front handle 70 hits a predetermined horizontal surface in advance of the battery BAT, when the belt sander 100, to which the battery BAT is mounted, is caused to fall onto the horizontal surface from a state in which one of the upper surface portion 62, the bottom surface portion 66, the first side surface portion 63, or the second side surface portion 64 is vertically oriented (i.e. faces vertically downward).
As shown in
The second coupling portion 74 is a component provided at the other end portion, on the opposite side from the distal end 721E of the second extension portion 72. The second coupling portion 74 is formed by a male screw portion 742, a female screw portion 744, and a fixture 746 being coupled to each other. The fixture 746 is a component having a substantially cylindrical column shape corresponding to the recessed shape of a second coupling recess portion 642 formed in the second side surface portion 64. A through hole for housing the female screw portion 744 is formed in the fixture 746.
The female screw portion 744 is coupled to the fixture 746 in a state of being housed in the through hole of the fixture 746. One end of the female screw portion 744 is inserted into a through hole 721H formed in the other end portion of the first section 721, of the second extension portion 72. The female screw portion 744 includes a through hole, and a female screw is formed in the inner surface of the through hole. In the state in which the female screw portion 744 is inserted into the through hole 721H, a male screw formed on the male screw portion 742 is threadedly engaged with the female screw of the female screw portion 744. As a result, the second coupling portion 74 is coupled to the second extension portion 72. Further, the female screw of the female screw portion 744 is screwed together with a male screw formed on a second end 76E2 of the shaft portion 76.
A surface 74S is formed on a surface, of the fixture 746, facing the second side surface portion 64. The surface 74S is configured to engage with a bottom surface 64S formed in the second coupling recess portion 642. As a result of the surface 74S and the bottom surface 64S engaging with each other, it is easy to determine the rotation position of the front handle 70 at the plurality of rotation angles, as will be described later.
As shown in
The mounting/removal operation portion 78 is fixed to a first end 76E1 of the shaft portion 76. Thus, the mounting/removal operation portion 78 can move the shaft portion 76 in a first direction DX1 toward the first side surface portion 63 along the rotational axis XH, and in a second direction DX2, which is opposite from the first direction DX1. By rotating the mounting/removal operation portion 78 in a forward direction around the rotational axis XH of the shaft portion 76, the second end 76E2 of the shaft portion 76 and the female screw portion 744 are screwed together, and the second coupling portion 74 is pushed into the second coupling recess portion 642. Further, when the mounting/removal operation portion 78 is rotated in the forward direction, an end surface 78E of the mounting/removal operation portion 78 comes into contact with an end surface 73E of the first coupling portion 73, the first coupling portion 73 is pressed in the first direction DX1 by the end surface 78E, and the first coupling portion 73 is pressed into the first coupling recess portion 632. As a result of this, the first coupling portion 73 and the second coupling portion 74 clamp the housing 60 in the state of being housed in the first coupling recess portion 632 and the second coupling recess portion 642. At this time, as a result of the surface 74S and the bottom surface 64S engaging with each other, and the cam surface 73S and the cam surface 63S engaging with each other, the front handle 70 is switched to the rotation suppression state at a predetermined rotation position.
As shown in
When the mounting/removal operation portion 78 is rotated in the reverse direction, the screw engagement between the second end 76E2 of the shaft portion 76 and the female screw portion 744 is released. Note that, as shown in
The configuration of the fall restriction mechanism provided in the belt sander 100 according to the present disclosure will be described with reference to
Of the first coupling portion 73, the tab portion 732a is a section having a protrusion protruding toward the shaft portion 76 from the wall surface of the through hole 73T. The tab portion 732a has a restriction surface 73E1 that is perpendicular to the rotational axis XH of the shaft portion 76, an inclined surface 73E2 that is opposite to (that faces or opposes) the shaft portion 76, and a back surface 73E3 on the opposite side from the inclined surface 73E2. The tab portion 732a is a structural body that is slidably disposed in the shaft recess portion 762a. Note that the shaft recess portion 762a has a predetermined width from a first end 762E1 to a second end 762E2 of the shaft recess portion 762a, along the axial direction of the shaft portion 76. Thus, in the state in which the tab portion 732a in the shaft recess portion 762a, the tab portion 732a can reciprocate within a range from the first end 762E1 to the second end 762E2.
When the mounting/removal operation portion 78 is operated and the front handle 70 is caused to be in the rotatable state, the shaft portion 76 moves in the second direction DX2 with respect to the tab portion 732a that is disposed in the shaft recess portion 762a. When the shaft portion 76 moves in the second direction DX2, the first end 762E1 of the shaft recess portion 762a is blocked by the restriction surface 73E1 of the tab portion 732a. As a result of this, the shaft portion 76 is restricted from moving any further in the second direction DX2. A position at which, due to the engagement (abutment) between the coupling engagement portion 732 and the shaft engagement portion 762 on the shaft portion 76, the shaft portion 76 is restricted (blocked) from moving further in the second direction DX2 is also referred to as a “restriction position RP”. In the example shown in
As shown in
The restraint portion 634 is a recess formed in the first side surface portion 63, and houses the tab portion 732a along the axial direction of the shaft portion 76. Specifically, the restraint portion 634 as shown in
The rotation position of the front handle 70 will be described with reference to
As described above, the front handle 70 can determine the rotation position of the front handle 70 at a plurality of rotation angles centered on the rotational axis XH, by causing the first coupling portion 73 and the first side surface portion 63 to be engaged with each other via the cam surfaces. Specifically, as shown in
In the first use mode, the position R1 is a suitable position when the user performs the working operation while gripping the second grip portion 77 of the front handle 70 with one hand, and gripping the first grip portion 82 of the main handle 80 with the other hand. The positions R2, R3, and R4 are positions at which a route of mounting and removal of the battery BAT does not intersect the second grip portion 77, and are favorable positions when the battery BAT is mounted to or removed from the battery mounting portion 30. The position R3 is oriented perpendicularly to the polishing surface FS, and is a suitable position when the user picks up and carries the belt sander 100.
As shown in
In
At the position R1, the second grip portion 77 is disposed further to the front side than the front end surface BE, that is, further to the front side than the front end of the housing 60. Further, at the position R1, the upper end surface TE is configured such that passes through at least a part of the second grip portion 77. In the example shown in
The position at which the battery BAT is disposed will be described with reference to
As described above, according to the belt sander 100 according to the present embodiment, the front handle 70 is disposed to surround at least a part of the battery BAT mounted to the battery mounting portion 30. As a result of the front handle 70 surrounding the battery BAT, the battery BAT can be protected from impact or the like when the belt sander 100 is dropped.
According to the belt sander 100 according to the present embodiment, in a side view of the belt sander 100, the first extension portion 71 and the second extension portion 72 overlap at least a part of the battery BAT mounted to the battery mounting portion 30. Thus, protection of the side surfaces of the battery BAT can be strengthened utilizing the first extension portion 71 and the second extension portion 72 of the front handle 70.
According to the belt sander 100 according to the present embodiment, in a side view of the belt sander 100, the first extension portion 71 and the second extension portion 72 overlap at least a part of the battery BAT mounted to the battery mounting portion 30, at whichever position the front handle 70 is disposed, of the positions R1, R2, R3, and R4, to which the front handle 70 can be rotated. It is thus possible to enhance/strengthen the protection of the battery BAT by the front handle 70, while securing the configuration in which the front handle 70 can be rotated. Further, the front handle 70 can be moved to the position at which it is desired to protect the battery BAT, and it is thus possible to enhance/strengthen the protection at a position, of the battery BAT, desired by the user.
According to the belt sander 100 according to the present embodiment, the mounting/removal operation portion 78 can switch the front handle 70 from the rotation suppressed state in which the rotation of the front handle 70 is suppressed, and the rotatable state in which the front handle 70 can rotate. Thus, the rotation position of the front handle 70 can be changed by a simple operation using the mounting/removal operation portion 78.
According to the belt sander 100 according to the present embodiment, when the shaft portion 76 moves in the second direction DX2, the shaft engagement portion 762 is configured to engage with the coupling engagement portion 732 at the predetermined restriction position RP on the shaft portion 76. Thus, when the mounting/removal operation portion 78 is operated and the shaft portion 76 moves in the second direction DX2, it is possible to suppress or prevent the mounting/removal operation portion 78 and the shaft portion 76 from falling off from the front handle 70 and the housing 60.
According to the belt sander 100 according to the present embodiment, as a result of the tab portion 732a being blocked in the shaft recess portion 762a at the restriction position RP on the shaft portion 76, the shaft portion 76 is restricted from moving in the second direction DX2. It is thus possible to form a mechanism for restricting the falling off of the shaft portion 76 by changing the shape of the first coupling portion 73 and the shaft portion 76, without adding a new dedicated component. Thus, it is possible to suppress or prevent an increase in a number of components of the belt sander 100.
According to the belt sander 100 according to the present embodiment, the first side surface portion 63 includes the restraint portion 634 that houses the tab portion 732a in a state of being adjacent to the back surface of the tab portion 732a that is engaged with the shaft recess portion 762a at the restriction position RP. Thus, it is possible to more reliably suppress or prevent the mounting/removal operation portion 78 and the shaft portion 76 from falling off from the front handle 70 and the housing 60.
According to the belt sander 100 according to the present embodiment, the second extension portion 72 includes the first section 721 extending from the coupling position with the housing 60, and the second section 722 curving from the first section 721 toward the second grip portion 77. The second section 722 is disposed in the interior of the second grip portion 77. Due to the configuration in which the second section 722 overlaps with the second grip portion 77, it is possible to improve the rigidity of the front handle 70, and the strength of the front handle 70 can thus be improved.
According to the belt sander 100 according to the present embodiment, the first extension portion 71 is formed using the synthetic resin, and the second extension portion 72 is formed using the metal. Further, the drive transmitting portion 50 is provided at the first side surface portion 63. By disposing the second extension portion 72 made of metal, whose weight is likely to be relatively large, on the opposite side from the drive transmitting portion 50 whose weight is likely to be greater, the weight balance of the overall belt sander 100 is more easily made uniform.
According to the belt sander 100 according to the present embodiment, the front handle 70 can be rotated and fixed at the position R1 at which at least a part of the second grip portion 77 is in the same plane as the upper surface portion 62. When performing the processing operation in the second use mode in which the polishing surface FS of the belt sander 100 is oriented (faces) vertically upward, the belt sander 100 can be supported by the upper end 77T of the second grip portion 77 and the upper surface portion 62. Thus, compared to the case in which the belt sander 100 is supported only by the upper surface portion 62, it is possible to improve the user operability.
According to the belt sander 100 according to the present embodiment, in a side view of the belt sander 100, the extending direction DC of the first grip portion 82 is inclined at an inclination angle between 30 degrees and 50 degrees with respect to the surface direction of the polishing surface FS such that the upper side of the first grip portion 82 is closer to the rear surface portion 66 than the lower side of the first grip portion 82. The user can easily perform both the first operation in which the user grips the main handle 80 and presses the polishing surface FS against the workpiece, and the second operation in which the user moves the belt sander 100 in order to change the processing position, and the operability of the belt sander 100 can thus be improved.
According to the belt sander 100 according to the present embodiment, in a plan view of the belt sander 100, at least a part of the battery mounting portion 30 overlaps at least a part of the polishing surface FS. When the battery BAT is mounted to the battery mounting portion 30, the load of the battery BAT can be imparted to the polishing surface FS utilizing gravity. Thus, the weight of the battery BAT can be utilized to press the polishing surface FS, and the operability of the belt sander 100 can be improved.
According to the belt sander 100 according to the present embodiment, the light-emitting portion 90 is provided on the surface of the housing 60. The light-emitting portion 90 is configured such that the optical axis thereof is changeable to the first irradiation direction LD1 that intersects the surface direction SD of the polishing surface FS, and to the second irradiation direction LD2 that does not intersect the surface direction SD of the polishing surface FS. The user can change the irradiation direction of the light-emitting portion 90 to match the use mode of the belt sander 100 or the rotation position of the front handle 70, and the operability of the belt sander 100 can thus be improved.
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. Thus, for example, even when performing the polishing operation using the belt sander 100 with respect to the workpiece having the processing surface and the wall surface adjacent to the processing surface, it is easy to cause the second side surface portion 64 of the housing 60 to approach the wall surface while polishing the processing surface, and it is thus easy to perform the polishing operation in the vicinity of the wall surface.
A configuration of the belt sander 100 according to a second embodiment will be described with reference to
Between the shaft portion 76b and the shaft portion 76 shown in the first embodiment, the configuration of the shaft engagement portion 762 differs. Specifically, the shaft portion 76b differs from the shaft portion 76 in that the shaft portion 76b is provided with a ring 762b in place of the shaft recess portion 762a, and is further provided with a fixing recess portion 764. The ring 762b is a so-called O-ring. The fixing recess portion 764 is a recess portion formed at the restriction position RP on the shaft portion 76, and is formed to have a narrower shaft diameter than other portions of the shaft portion 76b. The fixing recess portion 764 receives the ring 762b, and fixes the ring 762b. The depth of the fixing recess portion 764 is formed to be shallower than a diameter of the ring 762b. Thus, the ring 762b fixed to the fixing recess portion 764 protrudes from the surface of the shaft portion 76b. As a result, the ring 762b functions as the shaft engagement portion 762 having the protruding shape with respect to the surface of the shaft portion 76b. A position at which the ring 762b is disposed substantially coincides with the restriction position RP. Note that, in place of the ring 762b, the shaft portion 76b may be provided with a protruding portion protruding from the surface of the shaft portion 76b by forming the shaft diameter thereof to be larger than other portions of the shaft portion 76b. With this type of configuration also, in a similar manner to the ring 762b, the protruding portion can function as the shaft engagement portion 762 having the protruding shape with respect to the surface of the shaft portion 76b.
The first side surface portion 63b differs from the first side surface portion 63 shown in the first embodiment in that the first side surface portion 63b is provided with a sliding counterbore portion 636 in place of the restraint portion 634. When the shaft portion 76b slides in the first direction DX1 and the second direction DX2, the sliding counterbore portion 636 defines a space for the ring 762b not to come into contact with the first side surface portion 63b.
The first coupling portion 73b differs from the first coupling portion 73 shown in the first embodiment in the configuration of the coupling engagement portion 732. Specifically, the first coupling portion 73b differs from the first coupling portion 73 in that the first coupling portion 73b is provided with a counterbore portion 732b in place of the tab portion 732a. The counterbore portion 732b is a recess provided at a position, facing the first side surface portion 63b, at the periphery of the through hole for the insertion of the shaft portion 76. As shown in
As with the belt sander 100 according to the present embodiment, the fall restriction mechanism can also be formed utilizing the coupling engagement portion 732 having the recessed shape and the shaft engagement portion 762 having the protruding shape. As a result of the counterbore portion 732b engaging with the ring 762b, which is a shaft protrusion portion, at the restriction position RP, the shaft portion 76b is restricted from moving in the second direction DX2. Thus, when operating the mounting/removal operation portion 78 and moving the shaft portion 76b in the second direction DX2, it is possible to suppress or prevent the mounting/removal operation portion 78 and the shaft portion 76b from falling off from the front handle 70 and the housing 60.
The present disclosure is not limited to the above-described embodiments, and can be realized by various configurations insofar as they do not depart from the gist and scope of the present disclosure. For example, technological features in the embodiments corresponding to technological features in each of modes listed in the Summary of the invention can be switched or combined as appropriate, in order to resolve some or all of the above-described problems, or in order to achieve some or all of the above-described effects. Further, those technological features can be omitted as appropriate insofar as they are not described as being essential in the present specification.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023-209285 | Dec 2023 | JP | national |
