Portable polisher

Abstract

To provide a new art which enables improvement of operability of a portable polisher configured to move orbitally.SOLUTION: A portable polisher includes a polisher body, a battery holster, and a power cord. The polisher body includes: a body housing which houses a motor; and a polishing part configured to be moved orbitally by rotation of the motor. The battery holster includes a battery attachment part to which a battery may be attached. The power cord is configured to supply electric power of the battery attached to the battery attachment part to the polisher body. The power cord connects the polisher body with the battery holster without going through the housing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a portable polisher. [Background technology]

[0002] Sanders configured to cause an abrasive pad to move in an orbital manner are known. JP 2013-129014 A describes a so-called random orbit sander in which a battery mounting section is formed on the outer surface of a housing, and the battery power is supplied to a motor to rotate and eccentrically move the abrasive pad. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-129014 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the sander described in JP 2013-129014 A, the battery mounting section is positioned so that the relatively heavy battery is close to the output shaft in the center of the sander, improving the weight balance of the sander and improving operability and stability. However, there was a demand for a new technology that can improve the operability of a portable sander that is configured to orbitally move a sanding pad, regardless of the technology described in Patent Document 1. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms. According to a first aspect of the present disclosure, there is provided a portable polishing machine. The portable polishing machine includes a polishing machine main body, a battery holster, and a power cord. The polishing machine main body includes a main body housing that houses a motor, and a polishing unit configured to perform orbital motion by rotation of the motor. The battery holster includes a battery mounting section that detachably mounts a battery. The power cord is configured to supply power from the battery mounted in the battery mounting section to the polishing machine main body. The power cord is configured to connect the polishing machine main body and the battery holster without a housing.

[0006] According to this embodiment, the relatively heavy battery is mounted in the battery mounting portion of the battery holster, so that the weight of the grinding machine body can be reduced. This improves the operability of the portable grinding machine. In addition, the vibrations generated by the orbital motion can be prevented from being transmitted to the battery mounting portion, so that the life of the battery mounting portion and the battery mounted in the battery mounting portion can be extended. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a sander according to a first embodiment. [Diagram 2] FIG. 2 is another perspective view of the sander of the first embodiment. [Diagram 3] FIG. 2 is a top view of the sander body of the first embodiment. [Figure 4] FIG. 2 is a vertical cross-sectional view of the sander body of the first embodiment. [Diagram 5] FIG. 2 is a top view of the battery holster with the battery attached and the power cord in the first embodiment. [Figure 6] FIG. 2 is a vertical cross-sectional view of a battery holster with a battery attached thereto and a diagram showing a power cord in the first embodiment. [Figure 7] FIG. 2 is a top view of the sander body of the first embodiment with the power cord connected. [Figure 8] FIG. 2 is a vertical cross-sectional view of the sander in a first state. [Figure 9] FIG. 2 is a vertical cross-sectional view of the sander in a first state. [Figure 10] FIG. 11 is a top view of a sander body according to a second embodiment. [Figure 11] FIG. 11 is a vertical cross-sectional view of a sander body according to a second embodiment. [Figure 12] FIG. 11 is a vertical cross-sectional view of a sander body according to a third embodiment. [Figure 13] 13 is a vertical cross-sectional view of a battery holster with a battery attached thereto and a diagram showing a power cord in a third embodiment. FIG. [Figure 14] FIG. 2 is a simplified diagram showing the configuration of a sander that can be connected to a cleaner. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In the following, a representative and non-limiting embodiment of the present disclosure will be described in detail with reference to the drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing the preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. In addition, the additional features and disclosures disclosed below can be used separately or together with other features and disclosures to provide a further improved portable grinding machine, its manufacturing method and its use method.

[0009] Furthermore, the combinations of features and steps disclosed in the following detailed description are not essential to the implementation of the present disclosure in its broadest sense, but are described only to specifically illustrate representative embodiments of the present disclosure. Furthermore, the various features of the representative embodiments described above and below, and the various features of those described in the independent and dependent claims, do not have to be combined in the specific embodiments described herein or in the order listed to provide additional and useful embodiments of the present disclosure.

[0010] All features described in the specification and / or claims are intended to be disclosed individually and independently of one another as limitations to the original disclosure and claimed particulars, apart from any configuration of features described in the embodiments and / or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose intermediate configurations thereof as limitations to the original disclosure and claimed particulars.

[0011] In one or more embodiments, the power cord may include a first connector that connects to the grinder body, and the grinder body may include a second connector configured to connect to the first connector to provide power from the battery to the motor.

[0012] According to the above embodiment, the portable polisher is easier to handle than a configuration in which the power cord is pre-connected to the polisher body in an undetachable manner. Also, the battery holster and the power cord can be connected to another portable polisher having a second connector for use.

[0013] In one or more embodiments, the rotation shaft of the motor may extend in a vertical direction, and the grinding part may be located below the main housing. A main grip part having a shape that allows a user to hold it may be provided at an upper end of the main housing. When the main grip part and the motor are viewed from above the main grip part in the vertical direction (the direction of the rotation shaft), the main grip part may be disposed so as to overlap with the motor such that an outer edge of the main grip part surrounds an outer edge of the motor (such that the outer edge of the main grip part is located outside the outer edge of the motor).

[0014] According to the above embodiment, a user can easily perform the polishing operation by grasping the main gripping portion and pressing the polishing machine body downward, and can effectively suppress vibrations generated by the orbital motion of the polishing part.

[0015] In one or more embodiments, the grinding machine body may further include an auxiliary gripping portion connected to the main gripping portion and extending in a direction intersecting the rotation axis.

[0016] According to the above embodiment, the user can hold the main gripping portion with one hand while holding the auxiliary gripping portion with the other hand and press the grinding machine body against the workpiece to perform the grinding operation, thereby stabilizing the grinding operation.

[0017] In one or more embodiments, the grinding machine body may include a dust collection nozzle configured to discharge dust generated by the grinding unit grinding the workpiece. The dust collection nozzle may be provided below the auxiliary gripping unit in the vertical direction. When the auxiliary gripping unit and the dust collection nozzle are viewed in the vertical direction from above the auxiliary gripping unit, the dust collection nozzle may be disposed so as to overlap with the auxiliary gripping unit.

[0018] According to the above embodiment, the dust collection nozzle is disposed at a position where it overlaps with the auxiliary grip part in the vertical direction, so that the grinding machine body can be made compact. Also, since the dust collection nozzle does not interfere with the grinding work, the operability of the portable grinding machine can be improved.

[0019] In one or more embodiments, the second connector may be provided at an end of the auxiliary gripping portion on the side away from the main gripping portion in the extension direction of the auxiliary gripping portion.

[0020] According to the above embodiment, the second connector is disposed in a position on the grinder body away from the grinding unit, so that the power cord is prevented from interfering with the grinding operation. Also, when the auxiliary gripping part is disposed on the user side and the grinding unit is disposed on the side farther from the user, and the user is attached with the battery holster to perform the grinding operation, the power cord is located near the user's body, so that the power cord is prevented from interfering with the grinding operation.

[0021] In one or more embodiments, when the extension direction of the auxiliary grip part is defined as the front-rear direction, and the side where the auxiliary grip part is connected to the main grip part is defined as the front side, and the opposite side is defined as the rear side, the rear end part of the dust collection nozzle may be configured to detachably mount a dust collection container capable of storing the dust. The polishing part may include a polishing pad driven by the motor. Furthermore, the power cord may be configured not to come into contact with the dust collection container when the state of the portable polisher is in a first state. The first state may be a state that satisfies (i) to (iv). (i) The dust collection container is attached to the dust collection nozzle. (ii) The polishing pad is placed on a flat surface. (iii) The battery holster and the polisher main body are connected by the power cord. (iv) The battery holster is arranged so that the weight of the battery holster is not applied to the power cord.

[0022] According to the above embodiment, the portable grinder is configured so that the dust container and the power cord do not come into contact (are separated) when in the first state, so that the dust container and the power cord are prevented from rubbing against each other (friction) due to vibrations generated by the orbital motion. This improves the durability of the power cord, and as a result, improves the durability of the portable grinder.

[0023] In one or more embodiments, the first state may further be a state in which the battery holster satisfies the following (a) to (c): (a) the battery holster is disposed rearward of the rear end of the dust container; (b) a connection portion of the battery holster with the power cord faces upward; (c) the battery holster is disposed above a lower end position of the power cord when the power cord is extended downward. Note that the power cord being extended downward also refers to a state in which the power cord is not slackened and hangs down to a position lower than the grinder body. The power cord being extended downward may also be referred to as a state in which the power cord is fully extended.

[0024] According to the above embodiment, the first state may include a position (posture) of the battery holster that satisfies (a) to (c), and the portable polisher is configured such that the dust container and the power cord do not come into contact with each other when in the first state, thereby effectively preventing the dust container and the power cord from rubbing against each other due to vibrations generated by the orbital motion.

[0025] In one or more embodiments, the power cord may include a cord body and a cover. The cord body may be configured to provide electrical continuity between the battery mounted in the battery mounting section and the grinder body. The cover may be configured to extend rearward from the first connector and cover a portion of the cord body.

[0026] According to the above embodiment, the cover guides the cord body in the extending direction (rearward) of the cover, and therefore the cord body can be prevented from contacting the dust collection container. This improves the durability of the cord body. Note that "covering a part of the cord body" may mean surrounding the outside (outer periphery, radially outer side) of the cord body over a part of the entire length of the cord body.

[0027] In one or more embodiments, the cover may be less flexible than the cord body.

[0028] According to the above aspect, the cover is configured to have a smaller flexibility than the cord body, and therefore can guide the cord body in the extension direction (rearward), thereby further preventing the cord body from coming into contact with the dust collection container.

[0029] In one or more embodiments, when the dust collection container is attached to the rear end of the dust collection nozzle, the cover may be located above the dust collection container. Further, the cover may be configured to overlap the dust collection container by 30% or more in the front-to-rear direction.

[0030] According to the above embodiment, the cover overlaps the dust collection container by 30% or more and is positioned above the dust collection container, thereby effectively preventing the cord body from contacting the dust collection container while guiding the cord body in the extension direction (rearward).

[0031] In one or more embodiments, the cover may be configured such that when the portable grinder is in the first state, a first imaginary plane including the plane intersects with an axis passing through a center of the cover and extends rearward and upward from the first connector.

[0032] According to the above aspect, the cord body can be guided rearward and upward by the cover extending rearward and upward, which effectively prevents the cord body from coming into contact with the dust collection container.

[0033] In one or more embodiments, the cover may be configured such that, when the portable polisher is in the first state, an angle between a first imaginary plane including the flat surface and a second imaginary plane that passes through a rear end of the polishing pad and contacts a lower end of the dust container is 5° or more. Also, the cover may be configured such that an angle between the first imaginary plane and the second imaginary plane is 15° or less.

[0034] According to the above embodiment, even if the dust container vibrates or the front end of the grinding unit is lifted slightly upward during grinding, the lower end of the dust container is prevented from contacting the workpiece. Therefore, the durability of the grinding machine body to which the dust container is connected is prevented from decreasing. In addition, the grinding accuracy can be improved because the dust container is prevented from contacting the workpiece and causing damage to the workpiece.

[0035] In one or more embodiments, the power cord may be configured such that, when the portable grinder is in the first state, an angle formed by a tangent line drawn from an intersection of the cord body and a first imaginary plane including the plane to the cord body and an axis passing through a center of the cover is 55° or more. Also, the power cord may be configured such that an angle formed by the tangent line and the axis is 90° or less.

[0036] According to the above embodiment, by making the angle between the tangent and the axis 55° or more, it is possible to effectively prevent the cord body from contacting the dust container. Also, by making the angle between the tangent and the axis 90° or less, the cord body does not extend too far rearward from the grinder body, but bends downward behind the grinder body, so that it is possible to prevent the cord body from interfering with the grinding operation. As a result, it is possible to improve the durability of the power cord and the operability of the portable grinder.

[0037] In one or more embodiments, when the portable grinder is in the first state, the cord body may intersect with a first imaginary plane including the plane at a first position rearward of the grinder body. The first position may be a position forward of a position rearward from a rear end of the grinder body by a length of the grinder body in the front-to-rear direction.

[0038] According to the above embodiment, the cord body does not extend excessively rearward from the grinder body, and bends downward behind the grinder body, which prevents the cord body from interfering with the grinding operation and improves the operability of the portable grinder.

[0039] In one or more embodiments, the grinding machine body may be configured such that the mass in the front-to-rear direction is balanced at a predetermined balance point when the dust collection container is attached to the rear end portion. The balance point may be provided on the auxiliary grip portion.

[0040] According to the above embodiment, the mass (mass moment) in the front-rear direction of the grinder body to which the dust collection container is attached is balanced at the auxiliary grip portion extending in the front-rear direction, thereby improving the operability of the portable grinder.

[0041] In one or more embodiments, the grinding machine body may be configured such that the distance between the balance point and the midpoint of the length of the dust container in the front-to-rear direction is 0.150 m (meters) or more. Also, the grinding machine body may be configured such that the distance between the balance point and the midpoint of the length of the dust container in the front-to-rear direction is 0.200 m or less.

[0042] According to the above embodiment, when the dust collecting container is attached to the grinder body, the operability of the portable grinder can be improved.

[0043] In one or more embodiments, the grinding machine body may be configured so that the distance between the rotation shaft of the motor and the balance point is 0.040 m or more, and the grinding machine body may be configured so that the distance between the rotation shaft and the balance point is 0.100 m or less.

[0044] According to the above embodiment, the length of the grinding machine body in the front-rear direction can be set to a length suitable for grinding work, while preventing the distance between the balance point and the rotation shaft of the motor from becoming too large, thereby improving the operability of the portable grinding machine.

[0045] In one or more embodiments, the portable grinder may be configured such that the mass moment of a portion from the balance point to the rotation shaft of the motor is 0.20 Nm (Newton-meter) or more. Also, the portable grinder may be configured such that the mass moment is 0.50 Nm or less.

[0046] According to the above embodiment, it is possible to prevent the mass moment in front of the balance point from becoming too large, and therefore it is possible to provide a portable grinder.

[0047] In one or more embodiments, the battery holster may include a hook. The hook may be configured to allow the battery holster to be attached to a user. The length of the cord body may be 0.80 m or more. Also, the length of the cord body may be 2.0 m or less.

[0048] According to the above embodiment, a user can attach the battery holster to a belt or the like using the hook and perform grinding work. In addition, since the length of the cord body is 0.80 m or more, even if the user stretches his / her arm, the cord body is prevented from being pulled between the battery holster and the grinder body. In addition, since the length of the cord body is 2.0 m or less, the cord body is prevented from interfering with the grinding work. Therefore, the operability of the sander 1 can be improved.

[0049] In one or more embodiments, the rear end of the dust collection nozzle may be configured to be detachably attached to a hose connected to a suction device that sucks up the dust. The battery holster may include an attachment portion that can be attached to the suction device. The length of the cord body may be 2.0 m or more. Also, the length of the cord body may be 6.0 m or less.

[0050] According to the above embodiment, it is possible to prevent the cord body from being pulled between the grinder body and the suction device, and to prevent the cord body from interfering with the grinding operation.

[0051] In one or more embodiments, the portable sander may include the dust collection container.

[0052] According to the above embodiment, the portable grinder is configured such that the dust container and the power cord do not come into contact with each other when in the first state, so that the dust container and the power cord are prevented from rubbing against each other due to vibrations caused by the orbital motion, thereby improving the durability of the power cord and, as a result, improving the durability of the portable grinder.

[0053] In one or more embodiments, the grinder body may further include a controller configured to control the rotation of the motor.

[0054] According to the above embodiment, the controller and the motor are connected inside the grinding machine body, so the power cord can be made thinner than when the controller is placed in the battery holster, which further prevents the power cord from interfering with the grinding operation.

[0055] In one or more embodiments, the controller may be disposed between the auxiliary gripping portion and the dust collection nozzle in the vertical direction.

[0056] According to the above embodiment, the grinding machine body can be made smaller, and the operability of the portable grinding machine can be improved.

[0057] In one or more embodiments, the battery holster may include a controller configured to control rotation of the motor.

[0058] According to the above embodiment, the vibration caused by the orbital motion during the polishing operation can be prevented from being transmitted to the controller, thereby extending the life of the controller. Also, the polishing machine body can be made smaller than a configuration in which the polishing machine body includes the controller.

[0059] In one or more embodiments, the battery holster may include the battery mounted in the battery mounting portion.

[0060] According to the above embodiment, since the battery is attached to the battery holster, the weight of the grinding machine body can be reduced, thereby improving the operability of the grinding machine body.

[0061] First Embodiment Hereinafter, a sander 1 as one embodiment of a portable sander will be described with reference to Figures 1 to 6. The sander 1 includes a sander body 10, a battery holster 80, and a power cord 70 that connects the sander body 10 and the battery holster 80. The sander 1 is also called a random orbit sander.

[0062] The sander body 10 includes a housing 20 and a grinding unit 50. The housing 20 includes a main body housing 21 that houses a motor 40 (see FIG. 4), a controller housing 35 that houses a controller 60, and a handle unit 30. The grinding unit 50 is disposed on one side of the extension direction of the rotation axis A1 of the motor shaft 42, and is configured to perform eccentric motion and rotational motion (random orbit motion) by the rotation of the motor 40. The handle unit 30 is connected to the main body housing 21 on the other side of the extension direction of the motor shaft 42 opposite to the side on which the grinding unit 50 is disposed, and extends in a direction away from the main body housing 21. The sander body 10 is a small sander with a total weight of about 1.0 kg.

[0063] For ease of explanation, the direction in which the rotation axis A1 extends is defined as the up-down direction, and the side where the grinding unit 50 is located with respect to the main body housing 21 is defined as the lower side, and the opposite side is defined as the upper side. Furthermore, of the directions perpendicular to the up-down direction, the direction in which the handle unit 30 extends is defined as the front-rear direction, and in the front-rear direction, the side where the connection part of the handle unit 30 with the main body housing 21 (first end part 31 of the handle unit 30) is located is defined as the front side, and the opposite side is defined as the rear side. Furthermore, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction.

[0064] 1 to 4, the main body housing 21 is formed along the up-down direction. The outer diameters of the upper end 23 and the lower end 24 of the main body housing 21 are larger than the outer diameter of the middle portion 22 in the up-down direction of the main body housing 21. A switch 65 for switching between starting and stopping the motor 40 is provided at the front end of the upper end 23 of the main body housing 21.

[0065] The upper end 23 of the main housing 21 has a size and shape suitable for being gripped by a user. The upper end 23 of the main housing 21 functions as a gripping portion (hereinafter, referred to as a main gripping portion 25) of the sander body 10. As shown in Figs. 3 and 4, the main gripping portion 25 is formed in a substantially circular shape when viewed from above. The main gripping portion 25 has a shape and size such that the outer edge of the main gripping portion 25 overlaps with the motor 40 so as to surround the outer edge of the motor 40 when the main gripping portion 25 and the motor 40 are viewed in the direction of the rotation axis A1 from above the main gripping portion 25.

[0066] The handle portion 30 has a first end 31 connected to the main grip portion 25 and extends rearward from the main grip portion 25 along the front-rear direction. A second connector 53, which will be described later, is provided at the rear end (second end 32) of the handle portion 30. The width of the handle portion 30 in the left-right direction is formed to be suitable for a user to grip. In addition, the upper end of the handle portion 30 and the upper end of the main grip portion 25 are formed smoothly. A user can perform a sanding operation by holding the main grip portion 25 with one hand and holding the handle portion 30 with the other hand. In addition, when the user holds the main grip portion 25 with one hand, the user can also place the vicinity of the wrist of the one hand on the handle portion 30. The handle portion 30 functions as an auxiliary grip portion of the sander body 10.

[0067] The controller accommodating section 35 is disposed below the handle section 30 and extends in the front-rear direction. The controller accommodating section 35 is connected to the lower rear end of the intermediate section 22 of the main body housing 21 and extends rearward and upward from this connection point. The upper rear portion of the controller accommodating section 35 is connected to the lower rear portion of the handle section 30. A through hole 38 that penetrates the housing 20 in the left-right direction is defined between the upper front portion of the controller accommodating section 35 and the lower front portion of the handle section 30.

[0068] A dust collection nozzle 39 is disposed below the controller housing 35. The dust collection nozzle 39 extends in the front-rear direction. The dust collection nozzle 39 is connected to the rear end of the lower end 24 of the main body housing 21. The dust collection nozzle 39 is provided so as to incline rearward and upward from the connection point with the lower end 24 of the main body housing 21. A rear end 391 of the dust collection nozzle 39 protrudes rearward beyond the handle portion 30. In this embodiment, a dust collection pack 105 is connected to the rear end 391 of the dust collection nozzle 39. Dust generated by the grinding operation of the workpiece is discharged from a through hole provided in the grinding pad 51 through the lower end 24 of the main body housing 21 and the dust collection nozzle 39 to the dust collection pack 105.

[0069] 3, when the handle portion 30, the controller housing portion 35, and the dust collection nozzle 39 are viewed in the up-down direction from above the handle portion 30, the controller housing portion 35 and the dust collection nozzle 39 are arranged to overlap with the handle portion 30. The controller housing portion 35 is arranged between the handle portion 30 and the dust collection nozzle 39 in the up-down direction, and is formed slightly larger than the handle portion 30 and the dust collection nozzle 39 in the left-right direction.

[0070] 4, the motor 40 housed in the main housing 21 includes a motor body 41 having a stator and a rotor, and a motor shaft 42 extending in the vertical direction. The motor shaft 42 is supported by bearings 44 and 45 held in the main housing 21.

[0071] A fan 47 is fixed perpendicularly to the lower end of the motor shaft 42 via a bolt 46 extending in the vertical direction. The fan 47 is disposed at the lower end 24 of the main body housing 21.

[0072] A bearing box 49 is attached to the fan 47 in an eccentric manner via a bearing 48 provided eccentrically to the rotation axis A1 of the motor shaft 42.

[0073] The polishing unit 50 includes a polishing pad 51. The polishing pad 51 is formed in a disk shape, and sanding paper can be attached to the polishing pad 51. The polishing pad 51 is connected to the bearing box 49 by a bolt 56 extending in the vertical direction. The bottom surface of the polishing pad 51 functions as a polishing surface for polishing the workpiece when the sander body 10 is in use. In this embodiment, the drive shaft of the polishing unit 50 is also the rotation axis A1 of the motor 40. In the sander body 10, when the motor 40 rotates, the rotation is transmitted to the bearing box 49 via the bearing 48 eccentric to the motor shaft 42, and the bearing box 49 and the polishing pad 51 perform eccentric and rotational motions.

[0074] A second connector 53 is provided at the second end 32 of the handle portion 30. The second connector 53 is provided at the second end 32 of the handle portion 30 on an inclined wall 34 that inclines from the upper end of the handle portion 30 toward the rear lower portion. The second connector 53 includes a terminal portion 54 including positive and negative power supply terminals and a communication terminal, and a cylindrical wall 55 that surrounds the terminal portion 54 and protrudes obliquely upward from the inclined wall 34. A first connector 71 of a power cord 70 described later is detachably connected to the second connector 53.

[0075] The controller 60 housed in the controller housing 35 is electrically connected to the second connector 53 and the motor 40. The controller 60 includes various circuits, and is configured to control the operation of the motor 40 by controlling the power supplied to the motor 40 from a battery 101 attached to a battery holster 80.

[0076] As shown in FIG. 1 and FIG. 2, an adapter housing 36 is provided on the right wall at the rear of the handle 30. The adapter housing 36 is a recessed portion of the side wall at the rear end of the handle 30. As shown in FIG. 4, a wireless communication adapter 61 is inserted and attached to the adapter housing 36. The wireless communication adapter 61 is electrically connected to the controller 60. The wireless communication adapter 61 wirelessly communicates with other auxiliary equipment. The auxiliary equipment is, for example, a dust collector that can be connected to the dust collection nozzle 39 and sucks up chips. By wireless communication, the start and stop operations of the auxiliary equipment are linked to the start and stop operations of the sander main body 10. The wireless communication adapter 61 is associated (paired) with the wireless communication adapter 61 attached to the auxiliary equipment in advance to enable wireless communication. The pairing is performed by pressing both a button on the wireless communication adapter 61 and a button on the wireless communication adapter 61 of the auxiliary equipment. The button is, for example, a button for starting a WPS function or an AOSS function. When the user turns on the switch 65 of the sander main body 10 in a paired state to start the sander main body 10, the start-up information is transmitted from the wireless communication adapter 61 to the ancillary equipment. The ancillary equipment receives a signal from the wireless communication adapter 61 and starts up based on the signal. The state in which wireless communication is possible can be known by the lighting of a lamp provided on the wireless communication adapter 61.

[0077] Next, the battery holster 80 and the power cord 70 will be described with reference to Figures 1, 2, 5, and 6. The battery holster 80 includes a block-shaped battery holster main body 81, a battery mounting section 85, and a hook 86. The battery holster 80 includes a battery holster side connection section 87 to which one end 72 of the power cord 70 is physically connected.

[0078] Figures 5 and 6 show the battery holster 80 and the power cord 70 when the battery 101 attached to the battery attachment section 85 is placed face down, the battery holster side connection section 87 is positioned at the front, and the power cord 70 connected to the battery holster side connection section 87 is positioned in the front-to-rear direction.

[0079] The battery mounting section 85 is provided in an open recess (not shown) formed in the lower part of the battery holster main body 81. The battery mounting section 85 includes a pair of left and right slide rails extending in the front-rear direction, positive and negative power supply terminals, and a communication terminal. The pair of slide rails are configured to be engageable with a pair of rail receiving portions included in the battery 101. The battery 101 is slid from the rear of the battery mounting section 85 in the mounting direction (rear to front) relative to the battery mounting section 85, whereby the pair of rail receiving portions engage with the slide rails, and the battery 101 is mounted to the battery mounting section 85. When the battery 101 is mounted to the battery mounting section 85, the positive and negative power supply terminals and communication terminals of the battery mounting section 85 are electrically connected to the positive and negative power supply terminals and communication terminals of the battery 101, respectively.

[0080] The hook 86 protrudes upward and forward from the upper rear portion of the battery holster main body 81. The hook 86 is formed so that the battery holster 80 can be attached to the user's clothing or belt. The hook 86 also serves as an attachment portion for attaching the battery holster 80 to the user.

[0081] The battery holster side connection portion 87 is a portion that protrudes from the front end of the battery holster main body 81. The battery holster side connection portion 87 is physically connected to one end 72 of the power cord .

[0082] The battery holster 80 of this embodiment weighs about 0.7 kg to 1.0 kg when the battery 101 is attached. Therefore, the weight ratio of the battery holster 80 with the battery 101 attached to the sander body 10 is relatively large.

[0083] The power cord 70 electrically connects the sander body 10 and the battery holster 80, and also physically connects (couples) the sander body 10 and the battery holster 80 without a housing. It can also be said that the power cord 70 is not covered by a housing. The power cord 70 includes a cord body 73 and a first connector 71.

[0084] The cord body 73 is configured by covering a power line for supplying power from the battery 101 to the sander body 10 with a protective tube. The tube is made of polyvinyl chloride resin (PVC). The tube may be made of other synthetic resins, such as rubber or a rubber mixture. The power line is electrically connected to a power terminal provided on the battery mounting portion 85. In addition to the power line, the cord body 73 may also include a signal line for the controller 60 to detect an abnormality in the battery 101.

[0085] First connector 71 is provided at the end opposite to one end 72 of cord body 73. First connector 71 includes a terminal portion 74 connected to the power line of cord body 73, and a cylindrical engagement portion 75 provided around terminal portion 74. The periphery of first connector 71 of cord body 73 is covered with a substantially conical cylindrical cover 76 whose outer diameter widens towards first connector 71.

[0086] The first connector 71 is configured to be detachable from the second connector 53 of the sander body 10. In this embodiment, the first connector 71 and the second connector 53 are configured such that, when the engagement portion 75 of the first connector 71 is fitted into the cylindrical wall 55 of the second connector 53, the terminal portion 74 of the first connector 71 and the terminal portion 54 of the second connector 53 are electrically connected to each other.

[0087] In the sander 1 configured as above, when the battery 101 is attached to the battery mounting portion 85 of the battery holster 80 and the switch 65 of the sander body 10 is turned on by the user, the power of the battery 101 can be supplied to the sander body 10 via the power cord 70. In this embodiment, the power of the battery 101 is supplied to the controller 60 via the power terminal of the battery mounting portion 85, the power line of the cord body 73, the terminal portion 74 of the first connector 71, and the terminal portion 54 of the second connector 53. The controller 60 is connected to the motor 40 by lead wires (power line and signal line) and controls the power supplied to the motor 40. When the motor 40 rotates, the polishing portion 50 (polishing pad 51) performs eccentric motion and rotational motion (random orbit motion), enabling the polishing work of the workpiece.

[0088] According to the sander 1 of the first embodiment, the sander body 10 includes a sanding section 50 configured to perform orbital motion. A relatively heavy battery 101 is attached to a battery attachment section 85 of a battery holster 80, and the sander body 10 and the battery holster 80 are connected by a power cord 70 without a housing. Therefore, since the battery 101 is not attached to the sander body 10, the weight of the sander body 10 during sanding work can be reduced compared to a configuration in which the battery 101 is attached to the sander body. Therefore, the operability of the sander body 10 and the sander 1 can be improved.

[0089] Furthermore, according to the sander 1 of the first embodiment, the weight of the sander body 10 is lighter than that of a configuration in which the sander body is equipped with a battery, so that the sander body 10 can be easily operated even when the user holds the sander body 10 while performing the sanding work, for example, when the position of the workpiece is not vertically downward. Also, the burden on the user during the sanding work can be reduced.

[0090] Furthermore, in a sander configured to perform orbital motion, vibrations may be more likely to occur in exchange for improved performance, such as improved polishing accuracy, compared to a sander without orbital motion. However, in the sander 1 of this embodiment, the battery 101 is not attached to the sander body 10, so vibrations generated by the orbital motion are less likely to be transmitted to the battery mounting section 85 and the battery 101. This allows the battery mounting section 85 and the battery 101 to have a longer life.

[0091] According to the sander 1, a user can perform sanding work by attaching the battery holster 80 to the user using the hook 86. In addition, the battery holster 80 and the sander body 10 are connected by the power cord 70 without going through the housing 20. Therefore, the degree of freedom in the positional relationship between the battery holster 80 and the sander body 10 can be increased compared to a configuration in which the battery holster 80 and the sander body 10 are connected by a housing.

[0092] The main body housing 21 of the sander main body 10 houses the motor 40, and the grinding unit 50 is provided below the main body housing 21. A main gripping unit 25 is provided at the upper end of the main body housing 21. When the main gripping unit 25 and the motor 40 are viewed from above the main gripping unit 25 in the direction of the rotation axis A1, the main gripping unit 25 is arranged so as to overlap with the motor 40 so that the outer edge of the main gripping unit 25 surrounds the outer edge of the motor 40. Therefore, by gripping the main gripping unit 25 and pressing the sander main body 10 downward, the user can easily perform grinding work and can effectively deal with vibrations generated by the orbital motion of the grinding unit 50.

[0093] The sander body 10 also includes a handle portion 30 extending rearward from the main grip portion 25. Therefore, a user can hold the main grip portion 25 with one hand while holding the handle portion 30 with the other hand, and press the sander body 10 against a workpiece to perform a sanding operation, thereby enabling a stable sanding operation.

[0094] Furthermore, when the user holds the main grip portion 25 with one hand, the user can place the vicinity of the wrist of the other hand on the handle portion 30. In this way, when the user holds the main grip portion 25 with one hand to perform polishing work, the vicinity of the user's wrist can be supported by the handle portion 30, thereby reducing the burden on the user's hand and wrist.

[0095] The sander body 10 includes a second connector 53 configured to allow the first connector 71 of the power cord 70 to be detachably attached. Therefore, the power cord 70 and the battery holster 80 can be carried or stored separately from the sander body 10, making the sander 1 easier to handle as a whole compared to a configuration in which the power cord 70 is pre-connected to the sander body in an undetachable manner. In addition, the battery holster 80 and the power cord 70 can be connected to another portable sander having the second connector 53 for use.

[0096] The second connector 53 is provided at the rear end (second end 32) of the handle 30 extending rearward from the main grip 25. Therefore, the second connector 53 is disposed at a position on the sander body 10 away from the grinding unit 50, thereby preventing the power cord 70 from interfering with the grinding operation. Furthermore, when the handle 30 is disposed on the user side and the grinding unit 50 is disposed on the side farther from the user, and the battery holster 80 is attached to the user by the hook 86 to perform the grinding operation, the power cord 70 is disposed near the user's body, thereby further preventing the power cord 70 from interfering with the grinding operation.

[0097] The sander body 10 is also provided with a dust collection nozzle 39, which is disposed at a position overlapping the handle portion 30 when the handle portion 30 and the dust collection nozzle 39 are viewed vertically from above the handle portion 30. Therefore, by providing the dust collection nozzle 39, the sander body 10 can be prevented from becoming large, and the sander body 10 can be configured compactly.

[0098] In addition, since the sander body 10 includes the controller 60, the cord body 73 can be made thinner than when the battery holster includes the controller 60 and the lead wires connecting the controller 60 and the motor 40 are disposed inside the cord body 73 of the power cord 70. This further prevents the cord body 73 from interfering with the sanding operation.

[0099] The controller 60 is accommodated in a portion (controller accommodating portion 35) between the handle portion 30 of the housing 20 and the dust collection nozzle 39 in the vertical direction. This allows the sander body 10 to be configured compactly. In addition, since the controller accommodating portion 35 does not interfere with the sanding operation, the operability of the sander 1 can be improved.

[0100] 7 to 9 show the sander 1 in a state (hereinafter also referred to as the first state) that satisfies the following (i) to (iv). In the sander 1 of this embodiment, when in the first state, the dust bag 105 and the power cord 70 are configured not to come into contact with each other.

[0101] (i) A dust collection pack 105 is connected to the dust collection nozzle 39 . (ii) The polishing pad 51 is placed on a flat surface. The plane is a plane (horizontal plane) perpendicular to the up-down direction. The plane may be, for example, a processed surface. In Fig. 8 and Fig. 9, a virtual plane (first virtual plane P1) including the plane is illustrated. (iii) The battery holster 80 and the sander body 10 are connected by a power cord 70 . In the example shown in FIGS. 7 to 9, the first connector 71 and the second connector 53 are connected. (iv) Battery holster 80 is positioned so that the weight of battery holster 80 is not applied to power cord 70 . In the example shown in FIGS. 8 and 9, the battery holster 80 is placed on a predetermined surface (not shown) below the first imaginary plane P1. The condition (iv) can be satisfied when the battery holster 80 is attached to a user's belt or the like by the hook 86 and the user performs sanding work using the sander body 10 (sander 1).

[0102] In this embodiment, the first state further includes a state in which the sander 1 satisfies the following (a) to (c). The following (a) to (c) mainly relate to the state (posture, arrangement) of the battery holster 80.

[0103] (a) Battery holster 80 is disposed rearward of rear end 112 of dust pack 105. 9 shows an imaginary plane (fourth imaginary plane P4) that passes through rear end 112 of dust pack 105 and is perpendicular to the front-rear direction. In this embodiment, battery holster 80 is located rearward of fourth imaginary plane P4. (b) The portion of the battery holster 80 that is connected to the power cord 70 faces upward. In the example shown in FIG. 9, the portion of battery holster 80 (battery holster side connection portion 87) that is connected to one end 72 of power cord 70 faces upward. (c) Battery holster 80 is disposed above the position of the lower end of power cord 70 when power cord 70 is extended downward. FIG. 9 shows a virtual plane (fifth virtual plane P5) that passes through the lower end (one end 72) of the power cord 70 when the cord body 73 is extended downward and is perpendicular to the up-down direction. In the example shown in FIG. 9, the battery holster 80 is located above the fifth virtual plane P5. Note that the power cord 70 (cord body 73) being extended downward also means that the cord body 73 is not bent and hangs down below the sander body 10. The cord body 73 being extended downward can also be said to be in a fully extended state. Even if the weight of the battery holster 80 is not applied to the cord body 73, the cord body can be extended downward depending on the positional relationship between the battery holster 80 and the sander body 10.

[0104] The sander 1 of this embodiment is configured so that the dust collection pack 105 and the power cord 70 do not come into contact (are separated) when in the first state described above. Therefore, even if the dust collection pack 105 vibrates due to vibrations generated by orbital motion, the dust collection pack 105 and the power cord 70 are prevented from rubbing against each other. As a result, wear on the power cord 70 is suppressed.

[0105] In particular, the sander body 10 of this embodiment has a handle portion 30 extending in the front-rear direction, and the motor 40, which is a vibration source, and the grinding portion 50 are disposed in front of the handle portion 30. The dust collection pack 105 is connected to the rear end portion 391 of the dust collection nozzle 39, which protrudes rearward from the handle portion 30. Therefore, when a user holds the main grip portion 25 and presses the grinding portion 50 against a workpiece to perform grinding work, the dust collection pack 105 may vibrate relatively greatly. However, according to the sander 1 of this embodiment, the dust collection pack 105 and the power cord 70 are configured not to come into contact with each other, so that wear of the power cord 70 is suppressed. Therefore, the durability of the sander 1 can be improved.

[0106] Here, the dust collection pack 105 will be described. The dust collection pack 105 of this embodiment includes an attachment portion 106 and a dust collection portion 107. The attachment portion 106 is configured to be detachable from the rear end portion 391 of the dust collection nozzle 39. The dust collection portion 107 is connected to the attachment portion 106 and extends rearward from the attachment portion 106. The dust collection portion 107 is configured to store dust discharged from the dust collection nozzle 39 and to be able to discharge air sent out from the dust collection nozzle 39. In this embodiment, the dust collection portion 107 includes an external case having an air discharge hole, and a storage portion provided inside the external case and capable of storing dust. In this embodiment, the dust collection pack 105 is formed of synthetic resin. In other embodiments, the dust collection pack 105 may be formed of a cloth or paper container.

[0107] Below, we will explain the configuration of each part of the sander 1 that contributes to improving the durability and operability of the sander 1. In particular, we will explain in detail the configuration of the power cord 70 and the sander body 10, and the positional relationship between the power cord 70, the sander body 10, and the dust collection bag 105.

[0108] In this embodiment, cover 76 of power cord 70 extends rearward from first connector 71 and covers a portion of cord body 73. Specifically, cover 76 is disposed on the outer side (outer periphery, radially outer side) of cord body 73 over a portion of the entire length of cord body 73. Also, cover 76 is configured so that its flexibility is smaller than that of cord body 73 (protective tube covering the power line). With this configuration, cover 76 guides cord body 73 rearward in its own extension direction while preventing cord body 73 from contacting dust collection bag 105.

[0109] The cover 76 is disposed above (directly above) the dust collection pack 105 and spaced apart from the dust collection pack 105. A front end 761 of the cover 76 is located at substantially the same position as or slightly forward of a front end 111 of the dust collection pack 105 in the front-rear direction. A rear end 762 of the cover 76 is located above (directly above) the dust collection pack 105. An axis A2 passing through the center (radial center) of the cover 76 substantially coincides with an axis (not shown) passing through the center of the first connector 71.

[0110] The cover 76 is configured to overlap the dust collection pack 105 by 30% or more in the front-rear direction. Length L1 shown in Fig. 8 is the length from the front end 111 to the rear end 112 of the dust collection pack 105 (front-rear direction length, total length), and length L2 is the length of the portion where the cover 76 overlaps with the dust collection pack 105. In this embodiment, length L2 is about half of length L1. In other words, the cover 76 overlaps with the dust collection pack 105 by about 50%.

[0111] When the sander 1 is in the first state, the cover 76 extends rearward and upward from the first connector 71. At this time, as shown in Fig. 8, the axis A2 of the cover 76 intersects with the first imaginary plane P1. In other words, the angle R1 formed between the axis A2 of the cover 76 and the first imaginary plane P1 is greater than 0. With this configuration, the cover 76 can guide the cord body 73 rearward and upward.

[0112] In this embodiment, the angle R2 between the upper surface 113 of the dust collection pack 105 and the first imaginary plane P1 is smaller than the angle R1 between the axis A2 of the cover 76 and the first imaginary plane P1. In other words, the rearward and upward inclination of the cover 76 is larger than the inclination of the dust collection pack 105. This allows the cover 76 to guide the cord body 73 rearward and upward while effectively preventing the cord body 73 from contacting the upper surface 113 of the dust collection pack. Note that in FIG. 8, the angle R2 is shown as the angle between the upper surface 113 and a third imaginary plane P3 parallel to the first imaginary plane P1 for convenience of illustration.

[0113] The cord body 73 guided rearward and upward by the cover 76 bends downward at a predetermined position in the front-rear direction, and as shown in FIG. 8, passes rearward of the rear end 112 of the dust collection pack 105 and intersects with the first imaginary plane P1. FIG. 8 shows an angle R3 formed by a tangent A3 drawn from an intersection N1 between the first imaginary plane P1 and the cord body 73 to the cord body 73 and the axis A2 of the cover 76. The angle R3 is preferably 55° or more. By setting the angle R3 to 55° or more, the cord body 73 passes rearward of the dust collection pack 105 without contacting the dust collection pack 105 and bends downward. Therefore, wear of the cord body 73 can be suppressed. In addition, the angle R3 is preferably 90° or less. By setting the angle R3 to 90° or less, it is possible to suppress the cord body 73 from bending downward at a position excessively far rearward from the rear end 112 of the dust collection pack 105. This prevents cord body 73 from interfering with the grinding operation. In other words, by configuring power cord 70 so that angle R3 is equal to or greater than 55° and equal to or less than 90°, it is possible to improve the durability of power cord 70 (cord body 73) and the operability of sander 1.

[0114] 9 shows the length (front-rear direction length, overall length) L3 of the sander body 10. In this embodiment, the position N1 where the cord body 73 intersects with the first imaginary plane P1 is forward of a position (position N2) that is the length L3 of the sander body 10 rearward from the rear end of the sander body 10. By configuring the sander body 10 and the power cord 70 in this manner, the cord body 73 does not extend too far rearward from the sander body 10 and bends downward behind the sander body 10. Therefore, it is possible to effectively improve the durability of the power cord 70 and the operability of the sander 1.

[0115] FIG. 8 shows a second imaginary plane P2 that contacts the lower end (lower surface 114) of the dust collection pack 105 and passes through the rear end 511 of the polishing pad 51. The angle R4 between the first imaginary plane P1 and the second imaginary plane P2 is preferably 5° or more. With this configuration, even if the dust collection pack 105 vibrates or the front end of the polishing section 50 is lifted slightly upward during polishing work, the lower end (lower surface 114) of the dust collection pack 105 is unlikely to contact the workpiece. In addition, the angle R4 is preferably 15° or less. With this configuration, the dust collection pack 105 and the cord body 73 can be spaced apart to some extent in the vertical direction. Therefore, it is possible to suppress a decrease in durability of the dust collection pack 105 and the dust collection nozzle 39 to which the dust collection pack 105 is connected. Furthermore, it is possible to suppress the dust collection pack 105 from contacting the workpiece and causing damage to the workpiece, thereby improving the polishing accuracy.

[0116] The length of the cord body 73 is preferably 0.80 m (meters) or more. As described above, the battery holster 80 of the sander 1 is provided with a hook 86, and the user can attach the battery holster 80 to a belt or the like using the hook 86 to perform the sanding work. In addition, in the sander 1, the cord body 73 guided rearward and upward by the cover 76 is bent downward at a predetermined position in the front-rear direction, and as shown in FIG. 8, passes behind the rear end 112 of the dust collection pack 105 and intersects with the first imaginary plane P1. In this configuration, by making the length of the cord body 73 0.80 m or more, it is possible to prevent the cord body 73 from being pulled between the battery holster 80 attached to the user and the sander body 10, regardless of the size of the user's body, even if the user stretches out his / her arm. In addition, the length of the cord body 73 is preferably 2.0 m or less. By making the length of the cord body 73 2.0 m or more, it is possible to prevent the cord body 73 from interfering with the sanding work. Therefore, it is possible to improve the operability of the sander 1.

[0117] Next, a description will be given of the moment (mass moment) of the sander 1. The sander body 10 of this embodiment is configured so that the mass (mass moment) in the front-rear direction is balanced at a predetermined position (balance point C1, see FIG. 9) of the handle portion 30 with the dust collection pack 105 attached to the dust collection nozzle 39.

[0118] Fig. 9 shows a balance point C1, a center point C2 in the front-rear direction of the dust collection pack 105, and a center point C3 in the front-rear direction of the controller 60. Fig. 9 also shows a distance L4 between the balance point C1 and the center point C2 of the dust collection pack 105, a distance L5 between the balance point C1 and the rotation axis A1 of the motor 40, and a distance L6 between the balance point C1 and the center point C3 of the controller 60.

[0119] The distance L4 is preferably 0.150 m or more. Also, the distance L4 is preferably 0.200 m or less. With this configuration, the dust collection pack 105 can be disposed at a position that does not interfere with the sanding operation. Therefore, the operability of the sander 1 can be improved.

[0120] The distance L5 is preferably 0.040 m or more. The distance L5 is preferably 0.100 m or less. With this configuration, the length of the sander body 10 is made easy to grip, while preventing the distance between the balance point C1 and the rotation axis A1 of the motor 40 from becoming too large. This improves the operability of the sander 1.

[0121] The mass moment from the balance point C1 to the motor rotation axis A1 is preferably 0.20 Nm (Newton-meter) or more. Also, the mass moment is preferably 0.50 Nm or less. By configuring in this way, the balance in the front-to-rear direction of the sander body 10 to which the dust collection pack 105 is attached can be well maintained. Also, by configuring the sander body 10 so that the mass moment from the balance point C1 to the center point C3 is within the above range, it is possible to prevent the moment in the front part from the balance point C1 from becoming too large. Therefore, it is possible to provide a sander body 10 that is suitable for carrying around.

[0122] The shapes of the various parts of the sander 1 of this embodiment are as follows. However, the following values ​​are merely examples, and other configurations (shapes) may be adopted for the sander 1 as long as it includes the power cord 70 that physically and electrically connects the sander body 10 and the battery holster 80 without a housing.

[0123] Distance L4 from balance point C1 to point C2: 0.185 m (meters) Distance L5 from balance point C1 to rotation axis A1 of motor 40: 0.050 m Distance L6 from balance point C1 to point C3: 0.048 m Mass of controller 60: 0.100 kg (kilograms) Weight of dust collection pack 105: 0.130 kg Mass of the dust collection pack 105 when the storage section is filled with dust: 0.185 kg Mass of the part of the sander body 10 in front of the balance point C1: 0.780 kg Mass moment from the balance point C1 to the rotation axis A1 of the motor 40: 0.38 Nm (Newton meters)

[0124] <Second embodiment> A sander 1A of the second embodiment will be described with reference to Figures 10 and 11. Although the power cord 70 and battery holster 80 of the sander 1A are not shown in Figures 10 and 11, the sander 1A of this embodiment includes the power cord 70 and battery holster 80 described in the first embodiment. In the following, the same reference numerals are used for the same configurations as those of the above-mentioned embodiments, and detailed description thereof will be omitted.

[0125] A sander 1A of this embodiment differs from the sander 1 of the first embodiment mainly in that a sander body 10A is configured as an orbital sander.

[0126] Specifically, the polishing section 50A of the sander body 10A includes a polishing pad 51A and a base 52A provided on the polishing pad 51A. The base 52A and the housing 20 are connected by a foot (not shown). The foot regulates the rotation of the base 52A.

[0127] In the sander body 10A of this embodiment, the polishing pad 51A is formed in a substantially triangular shape with an acute angle at the front end when viewed in the vertical direction. Furthermore, in the sander body 10A, a bearing box 49A is further eccentrically attached to the fan 47 via bearings 481A, 482A that are eccentrically provided in the vertical direction on the rotation axis A1 of the motor shaft 42. The other configurations of the sander 1A of the second embodiment are the same as those of the sander 1 of the first embodiment described above, and therefore will not be described.

[0128] The sander 1A of the second embodiment has a similar configuration to the sander 1 of the first embodiment, except that the rotational movement of the grinding portion 50A of the sander body 10A is restricted. Therefore, the sander 1A of the second embodiment also provides the same effects as the sander 1 of the first embodiment.

[0129] In the sander 1A of this embodiment, the mass of the portion forward from the balance point C1 is 0.700 kg, and the mass moment of the portion from the balance point C1 to the rotation axis A1 of the motor 40 is 0.34 Nm (Newton meters). The configurations of the power cord 70 and the sander main body 10A in the sander 1A, the positional relationship between the power cord 70, the sander main body 10A, and the dust collection pack 105, and the moment (mass moment) of the sander 1A are the same as those in the first embodiment, so a description thereof will be omitted.

[0130] <Third embodiment> A sander 1B of the third embodiment will be described with reference to Figs. 12 and 13. The sander 1B of this embodiment differs from the sander 1 of the first embodiment mainly in that the housing 20B of the sander body 10B does not house the controller 60, but the battery holster body 81B of the battery holster 80B houses the controller 60. As shown in Fig. 13, the battery holster body 81B is formed larger in the vertical direction than the battery holster body 81 of the first embodiment, and houses the controller 60 in the upper part of the battery mounting part 85. In this embodiment, the controller 60 housed in the battery holster body 81B, the lead wires (power line and signal line) to the motor 40 of the sander body 10B, and the signal line for transmitting the operation of the switch 65 to the controller are inserted into the cord body 73B.

[0131] In the sander 1B of the third embodiment, when a battery 101 is attached to the battery attachment section 85 of the battery holster 80B and a switch 65 of the sander body 10B is turned on by a user, the power of the battery 101 is controlled by the controller 60 housed in the battery holster body section 81B and is supplied to the motor 40 of the sander body 10B via the power cord 70B. The other configurations of the sander 1A are similar to those of the sander 1 of the first embodiment, and therefore will not be described.

[0132] According to the sander 1B of the third embodiment described above, the battery holster 80B connected to the sander body 10B by the power cord 70B is equipped with the controller 60. Therefore, it is possible to suppress the transmission of vibrations generated by the orbital motion of the sanding part 50 during sanding work to the controller 60.

[0133] Furthermore, since the controller 60 is not housed in the housing 20 of the sander body 10B, the sander body 10B can be configured compactly.

[0134] The sander 1B of the third embodiment has a similar configuration to the sander 1 of the first embodiment, except that the battery holster 80B is provided with the controller 60. Therefore, the sander 1B of the third embodiment also provides the same effects as the first embodiment.

[0135] <Fourth embodiment> A sander 1C of the fourth embodiment will be described with reference to FIG. 14. In this embodiment, a hose 201 is attached to the rear end 391 of the dust collection nozzle 39, and the sander body 10 is connected to the cleaner 200 via the hose 201. In this embodiment, the battery holster 80C includes an attachment portion 81C that allows the battery holster to be attached to the cleaner 200. The attachment portion 81C may be, for example, a hook that can be engaged with the cleaner 200. Dust generated during the sanding work is sucked (stored) in the cleaner 200 via the hose 201 by operating the cleaner 200. The cord body 73 and the hose 201 are bound together by a band 205. The length of the cord body 73 is preferably 2.0 m or more. In addition, the length of the cord body 73 is preferably 6.0 m or less. With this configuration, it is possible to prevent the cord body 73 from being pulled between the sander body 10 and the cleaner 200 and the cord body 73 from interfering with the sanding work. Therefore, the operability of the sander 1C can be improved.

[0136] <Correspondence> The correspondence between each component of the above embodiment and each component of the technology of the present disclosure is shown below. However, each component of the embodiment is merely an example and does not limit each component of the technology of the present disclosure. Sanders 1, 1A, 1B, and 1C are examples of "portable grinders." The sander bodies 10, 10A, and 10B are examples of a "grinding machine body." The power cords 70 and 70B are examples of a "power cord." The motor 40 is an example of a "motor." Main housing 21, housing 20, and 20B are examples of the "main housing." The polishing sections 50 and 50A are examples of the "polishing section." Battery 101 is an example of a "battery." The battery mounting section 85 is an example of a "battery mounting section." Battery holsters 80, 80B, and 80C are examples of a "battery holster." The cord main body 73, 73B and the power cords 70, 70B are an example of a "power cord." The first connector 71 and the second connector 53 are examples of the "first connector" and the "second connector", respectively. The upper end portion 23 is an example of the "upper end portion." The main gripping portion 25 is an example of a "main gripping portion." The handle portion 30 is an example of an "auxiliary grip portion." The dust collection nozzle 39 is an example of a "dust collection nozzle". The second end 32 is an example of the "end away from the main gripping portion." The controller 60 is an example of a "controller." The rear end portion 391 is an example of the "rear end portion." The dust collection pack 105 is an example of a "dust collection container." The rear end 112 is an example of the "rear end of the dust collection container." The battery holster side connection portion 87 is an example of a "connection portion with a power cord in a battery holster". One end 72 of the power cord 70, 70B is an example of the "lower end of the power cord when the power cord is extended downward." The polishing pads 51 and 51A are examples of the "polishing pad". The cord bodies 73 and 73B are examples of the "cord body." The cover 76 is an example of a "cover." The axis A2 is an example of "an axis passing through the center of the cover." Tangent line A3 is an example of a "tangent line." The first imaginary plane P1 and the second imaginary plane P2 are examples of the "first imaginary plane" and the "second imaginary plane", respectively. Hook 86 is an example of a "hook." The attachment portion 81C is an example of the "attachment portion." The cleaner 200 is an example of a "suction device." Hose 201 is an example of a "hose."

[0137] <Other embodiments> The first connector 71 of the power cord 70, 70B may be permanently connected to the sander body 10, 10A, 10B. The power cord 70, 70B may also have a connector on one end 72, and the connector and the battery holster 80, 80B may be configured to be detachable.

[0138] The shape of the housing 20, 20B of the sander body 10, 10A, 10B is not limited to that of the above embodiment. For example, the housing 20, 20B does not have to be provided with the handle portion 30.

[0139] The second connector 53 may be provided at another location on the housing 20, 20B. For example, it may be provided at the first end 31 of the handle portion 30 or at the rear of the controller accommodating portion .

[0140] Instead of or in addition to the hook 86, the battery holster 80, 80B may be provided with another attachment portion, such as a belt, for attaching the battery holster 80, 80B to a user.

[0141] In the above-described embodiment, the rotation axis A1 of the motor 40 is also the drive shaft of the polishing units 50, 50A. In contrast, the rotation axis A1 of the motor 40 and the drive shaft of the polishing units 50, 50A do not have to coincide with each other. For example, the motor shaft may be disposed in the front-rear direction, and the drive shaft of the polishing units may be disposed in the up-down direction, and the rotational power of the motor may be transmitted to the drive shaft of the polishing units by a known transmission mechanism.

[0142] The above-described embodiment can be applied to other portable grinding machines in which the grinding unit is configured to perform orbital motion, such as polishers.

[0143] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention column can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0144] 1, 1A, 1B, 1C: Sander, 10, 10A, 10B: Sander body, 20: Housing, 21: Main housing, 22: Middle part, 23: Upper end, 24: Lower end, 25: Main grip part, 30: Handle part, 31: First end, 32: Second end, 34: Inclined wall, 35: Controller housing part, 36: Adapter housing part, 38: Through hole, 39: Dust collection nozzle, 40: Motor, 41: Motor body, 42: Motor shaft, 44, 45, 48: Bearing, 46: Bolt, 47: Fan, 49: Bearing box 49A: bearing box, 50: polishing part, 50A: polishing part, 51: polishing pad, 51A: polishing pad, 53: second connector, 54: terminal part, 55: cylinder wall, 56: bolt, 60: controller, 61: wireless communication adapter, 65: switch, 70: power cord, 70B: power cord, 71: first connector, 72: one end, 73: cord body, 73B: cord body, 74: terminal part, 75: engagement part, 76: cover, 80, 80B, 80C: battery holster, 81, 81B: battery holster body part, 81C: mounting part, 85: battery mounting part, 86: hook, 87: battery holster side connection part, 101: battery, 105: dust collection bag, 481A, 482A: bearing, 200: cleaner, 201: hose, 205: band, 81C: mounting part, A1: rotation axis, A2: axis line, A3: tangent line, P1: first imaginary plane, P2: second imaginary plane, P3: third imaginary plane, P4: fourth imaginary plane, P5: fifth imaginary plane, R1: angle between the first imaginary plane and the axis line of the cover, R2: angle between the first imaginary plane (third imaginary plane) and R1: angle with the top surface of the dust collection pack, R2: angle between axis A2 and tangent A3, R3: angle between the first imaginary plane and the second imaginary plane, C1: balance point, C2: center point of the dust collection pack in the front-to-back direction, C3: center point of the controller in the front-to-back direction, L1: total length of the dust collection pack, L2: overlap length of the cover over the dust collection pack, L3: total length of the sander body, L4: distance from balance point C1 to center point C2, L5: distance from balance point C1 to rotation axis A1, L6: distance from balance point C1 to center point C3

Claims

1. A portable polishing machine, comprising: a grinding machine body including a motor, a controller configured to control the rotation of the motor, a main body housing that accommodates the motor, a controller accommodating section that accommodates the controller, and a grinding section configured to perform orbital motion by the rotation of the motor; a battery holster having a battery mounting portion into which a battery can be mounted; a power cord configured to supply power from the battery attached to the battery attachment section to the grinding machine body, the power cord connecting the grinding machine body and the battery holster without a housing; The upper end of the main body housing is configured as a main grip portion that can be gripped by a user, The rotating shaft of the motor extends in a vertical direction, and the grinding portion is located below the main body housing, when the main gripping part and the motor are viewed from above the main gripping part, the main gripping part is disposed so as to overlap the motor such that an outer edge of the main gripping part surrounds an outer edge of the motor, one end of the controller accommodating portion is connected to the main body housing, and extends in a direction intersecting the rotation axis when the grinding machine main body is viewed from above; Portable grinder.

2. 2. The portable grinder of claim 1, The grinding machine body further includes an auxiliary gripping portion connected to the main gripping portion and extending in a direction intersecting the rotation axis, A portable grinder, wherein at least a portion of the auxiliary grip portion in the extension direction and at least a portion of the controller accommodating portion in the extension direction are separated in the vertical direction.

3. A portable polishing machine as claimed in claim 1, The grinding machine body further includes an auxiliary gripping portion connected to the main gripping portion and extending in a direction intersecting the rotation axis, A portable grinder, wherein the controller accommodating portion is positioned below the auxiliary gripping portion and overlaps with the auxiliary gripping portion when the auxiliary gripping portion and the controller accommodating portion are viewed from above.

4. A portable polishing machine as claimed in claim 3, A portable grinder, wherein the width of the controller accommodating portion is wider than the width of the auxiliary grip portion in the vertical direction and the left-right direction intersecting the extension direction of the auxiliary grip portion.

5. 2. The portable grinder of claim 1, The grinding machine body includes: an auxiliary gripping portion connected to the main gripping portion and extending in a direction intersecting the rotation axis; a dust collection nozzle provided below the auxiliary gripping portion in the vertical direction and configured to discharge dust generated by the grinding portion grinding the workpiece; A portable grinder, wherein when the auxiliary gripping part and the dust collection nozzle are viewed in the vertical direction from above the auxiliary gripping part, the dust collection nozzle is positioned so as to overlap with the auxiliary gripping part.

6. A portable polishing machine as claimed in claim 1, The grinding machine body includes: a dust collection fan accommodated in a lower portion of the main body housing; an auxiliary gripping portion connected to the main gripping portion and extending in a direction intersecting the rotation axis; A portable polishing machine, wherein the controller is disposed between the dust collection fan and the auxiliary grip portion in the vertical direction.

7. 6. The portable grinder of claim 5, When the extension direction of the auxiliary grip portion is defined as a front-rear direction, the side where the auxiliary grip portion is connected to the main grip portion is defined as a front side, and the opposite side is defined as a rear side, a rear end portion of the dust collection nozzle is configured to detachably mount a dust collection container capable of storing the dust, the grinding machine body is configured such that a mass in the front-rear direction is balanced at a predetermined balance point when the dust collecting container is attached to the rear end portion, A portable grinder, wherein the balance point is provided on the auxiliary gripping portion.

8. A portable polishing machine as claimed in claim 7, The portable grinder is configured such that the distance between the midpoint of the length of the dust collection container in the front-to-rear direction and the balance point is 0.150 m or more and 0.200 m or less.

9. A portable polishing machine as claimed in claim 7, The portable grinder, wherein the grinder body is configured such that the distance between the rotation shaft of the motor and the balance point is 0.040 m or more and 0.100 m or less.

10. A portable grinder according to claim 7, The portable grinder is configured so that a mass moment of a portion from the balance point to the rotation shaft of the motor is 0.20 Nm or more and 0.50 Nm or less.

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