Power tool system and attachment

Abstract

To provide a power tool system capable of preventing work from being performed in a state where a combination with an attachment is not appropriate, and to provide an attachment.SOLUTION: A power tool system 100 includes: a predetermined kind of power tool 1; and an attachment 2 attachable to the predetermined kind of power tool 1. The attachment 2 is provided with a projection part 3 constituted to have a structure where an attachment side engagement part 21 can be engaged with the predetermined kind of power tool 1 by having no interference with the predetermine kind of power tool 1, and also constituted to have a structure where the attachment side engagement part 21 cannot be engaged with a power tool different from the predetermined kind of power tool by interference with the different kind of power tool 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates generally to power tool systems and attachments, and more particularly to power tool systems and attachments that estimate emotions. [Background technology]

[0002] Patent Document 1 discloses a rotary impact tool including an impact force generating unit, a shank, a torque measuring unit, a rotation angle measuring unit, a calculation unit, and a control unit. The impact force generating unit generates an impact force by converting the power of a drive source into a pulsed torque. The shank transmits the pulsed torque to the tool bit by the generated impact force. The torque measuring unit measures a measurement torque that is applied to the shank. The rotation angle measuring unit measures the rotation angle of the shank. The calculation unit calculates angular acceleration based on the measured rotation angle, and calculates a tightening torque based on the angular acceleration and the measured torque. The control unit controls the drive source based on the tightening torque. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2017 / 154623 Summary of the Invention [Problem to be solved by the invention]

[0004] In a power tool system such as the impact rotary tool described above, multiple types of attachments can be selectively attached to the power tool. In this case, it is possible that an attachment that is not suitable for the power tool will be attached to the power tool. In other words, it is possible that work will be performed with an inappropriate combination of the power tool and the attachment.

[0005] An object of the present disclosure is to provide a power tool system and an attachment that can prevent work from being performed in an inappropriate combination with the attachment. [Means for solving the problem]

[0006] A power tool system according to one aspect of the present disclosure is a power tool system including a predetermined type of power tool and an attachment that can be attached to the predetermined type of power tool. The attachment includes an attachment-side engagement portion, an attachment-side connection surface, and a protrusion. The attachment-side engagement portion engages with the predetermined type of power tool. The attachment-side connection surface connects to the predetermined type of power tool when the attachment-side engagement portion engages with the predetermined type of power tool. The predetermined type of power tool includes a drive unit, an output shaft, and a mounting portion. The output shaft rotates by the drive unit. The mounting portion is provided around the output shaft and has the attachment attached to it. The mounting portion has a tool-side engagement portion and a tool-side connection surface. The tool-side engagement portion is configured to be engageable with the attachment-side engagement portion. The tool-side connection surface connects to the attachment-side connection surface when the tool-side engagement portion engages with the attachment-side engagement portion. When the attachment is attached to the predetermined type of power tool, the predetermined type of power tool and the attachment are aligned in a predetermined direction. The tool-side connecting surface is provided with at least one tool-side convex portion that is a convex portion that protrudes in the predetermined direction. The attachment-side connecting surface is provided with at least one attachment-side convex portion that is a convex portion that protrudes in the predetermined direction and is arranged so that the attachment-side connecting surface engages with the at least one tool-side convex portion. A tool-side first dimension in the predetermined direction between the tool-side connecting surface and the tool-side engaging portion is the same as a first attachment-side dimension in the predetermined direction between a tip of the at least one attachment-side convex portion and the attachment-side engaging portion. A tool-side second dimension in the predetermined direction between the tip of the at least one tool-side convex portion and the tool-side engaging portion is the same as a second attachment-side dimension in the predetermined direction between the attachment-side connecting surface and the attachment-side engaging portion.The protrusion is configured so that it does not interfere with the specified type of power tool, thereby allowing the attachment side engaging portion to engage with the specified type of power tool, and so that it interferes with a type of power tool different from the specified type of power tool, thereby preventing the attachment side engaging portion from engaging with the different type of power tool.

[0007] An attachment according to one aspect of the present disclosure is an attachment to be attached to a predetermined type of power tool. The attachment according to one aspect of the present disclosure includes an attachment-side engaging portion, an attachment-side connecting surface, and a protrusion. The attachment-side engaging portion engages with a tool-side engaging portion provided on the predetermined type of power tool. When the attachment-side engaging portion engages with the tool-side engaging portion, the attachment-side connecting surface connects to the tool-side connecting surface provided on the predetermined type of power tool. When the attachment is attached to the predetermined type of power tool, the predetermined type of power tool and the attachment are aligned in a predetermined direction. The tool-side connecting surface is provided with at least one tool-side convex portion that is a convex portion that protrudes in the predetermined direction. The attachment-side connecting surface is provided with at least one attachment-side convex portion that is a convex portion that protrudes in the predetermined direction and is arranged so that the attachment-side connecting surface engages with the at least one tool-side convex portion. The attachment-side first dimension in the predetermined direction between the tip of the at least one attachment-side convex portion and the attachment-side engaging portion is the same as the tool-side first dimension in the predetermined direction between the tool-side connecting surface and the tool-side engaging portion. The attachment-side second dimension in the predetermined direction between the attachment-side connecting surface and the attachment-side engaging portion is the same as the tool-side second dimension in the predetermined direction between the tip of the at least one tool-side convex portion and the tool-side engaging portion. The protrusion is configured so that it does not interfere with the predetermined type of power tool, thereby allowing the attachment-side engaging portion to engage with the predetermined type of power tool, and so that it interferes with a type of power tool different from the predetermined type of power tool, thereby preventing the attachment-side engaging portion from engaging with the different type of power tool. [Effects of the Invention]

[0008] The present disclosure has the advantage of being able to prevent work from being performed in an inappropriate combination with an attachment. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a power tool system according to this embodiment. [Figure 2] FIG. 2 is a perspective view of the external appearance of the power tool system. [Figure 3] FIG. 3 is a perspective view of the appearance of the attachment. [Figure 4] FIG. 4 is an external perspective view of a main part of the predetermined type of power tool. [Figure 5] FIG. 5 is a cross-sectional view of a main part of the attachment when it is brought close to a predetermined type of power tool. [Figure 6] FIG. 6 is a cross-sectional view of a main part of the attachment when it is brought close to a power tool of a type different from a predetermined type of power tool. [Figure 7] 7A and 7B are schematic developments of a part of a cross section of a tool-side connecting surface of a predetermined type of power tool and an attachment-side connecting surface of an attachment, respectively. [Figure 8] FIG. 8 is a schematic development view showing a part of a cross section of the tool-side connecting surface of a predetermined type of power tool and the attachment-side connecting surface of the attachment when the attachment is brought close to the predetermined type of power tool. [Figure 9] FIG. 9 is a cross-sectional view of a main part of the attachment according to the first modified example of the same, when the attachment is brought close to a predetermined type of power tool. [Figure 10] FIG. 10 is a cross-sectional view of a main part of the attachment according to the first modified example when it is brought close to a power tool of a type different from a predetermined type of power tool. DETAILED DESCRIPTION OF THE INVENTION

[0010] The embodiments and modifications described below are merely examples of the present disclosure. The present disclosure is not limited to the embodiments and modifications, and various modifications other than these embodiments and modifications are possible depending on the design, etc., as long as they do not deviate from the technical concept of the present disclosure. The drawings described in the following embodiments and modifications are schematic drawings, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0011] (Embodiment) (1) Overview An overview of the power tool system 100 according to this embodiment will be described below with reference to FIGS. 1 to 7B.

[0012] The power tool system 100 according to this embodiment is used for tightening work in which an operator tightens fastening parts (screws, bolts, nuts, etc.) to an object to be tightened (electrical appliances, furniture, etc.). The power tool system 100 may also be used for removing work in which an operator loosens fastening parts from an object to be tightened.

[0013] As shown in FIGS. 1 and 2, the power tool system 100 of this embodiment includes a predetermined type of power tool 1 and an attachment 2 that is attached to the predetermined type of power tool 1.

[0014] 1 and 3, the attachment 2 includes an attachment-side engaging portion 21, an attachment-side connecting surface 22, and a protrusion 3. The attachment-side engaging portion 21 engages with a predetermined type of power tool 1. When the attachment-side engaging portion 21 engages with the predetermined type of power tool 1, the attachment-side connecting surface 22 connects to the predetermined type of power tool 1.

[0015] As shown in FIG. 1, a predetermined type of power tool 1 includes a drive unit 11, an output shaft 12, and a mounting unit 13. The output shaft 12 is rotated by the drive unit 11. The mounting unit 13 is provided around the output shaft 12, and an attachment 2 is attached to it. As shown in FIGS. 1 and 4, the mounting unit 13 has a tool-side engaging portion 131 and a tool-side connecting surface 132. The tool-side engaging portion 131 is configured to be engageable with the attachment-side engaging portion 21 of the attachment 2. The tool-side connecting surface 132 connects to the attachment-side connecting surface 22 when the tool-side engaging portion 131 is engaged with the attachment-side engaging portion 21.

[0016] As shown in FIG. 2, when the attachment 2 is attached to the power tool 1 of a predetermined type, the power tool 1 of a predetermined type and the attachment 2 are aligned in a predetermined direction D1.

[0017] Fig. 7A is a schematic development of a part of a cross section of the tool-side connecting surface 132 of a predetermined type of power tool 1 taken along the cross section line L1 shown in Fig. 4. The dotted line Y1 shown in Fig. 7A indicates the position of the tool-side engaging portion 131 of the predetermined type of power tool 1 in the predetermined direction D1. Fig. 7B is a schematic development of a part of a cross section of the attachment-side connecting surface 22 of the attachment 2 taken along the cross section line L2 shown in Fig. 3. The dotted line Y2 shown in Fig. 7B indicates the position of the attachment-side engaging portion 21 of the attachment 2 in the predetermined direction D1.

[0018] 4 and 7A, the tool side connection surface 132 is provided with at least one tool side protrusion 133 that is a protrusion that protrudes in the predetermined direction D1. As shown in FIGS. 3 and 7B, the attachment side connection surface 22 is provided with at least one attachment side protrusion 221 that is a protrusion that protrudes in the predetermined direction D1 and is arranged so that the attachment side connection surface 22 engages with the at least one tool side protrusion 133 (see FIG. 7A).

[0019] The tool-side first dimension X11 (see FIG. 7A) in the predetermined direction D1 between the tool-side connecting surface 132 and the tool-side engaging portion 131 (i.e., dotted line Y1) is the same as the attachment-side first dimension X21 (see FIG. 7B) in the predetermined direction D1 between the tip of at least one attachment-side protrusion 221 and the attachment-side engaging portion 21 (i.e., dotted line Y2). Similarly, the tool-side second dimension X12 (see FIG. 7A) in the predetermined direction between the tip of at least one tool-side protrusion 133 and the tool-side engaging portion 131 is the same as the attachment-side second dimension X22 (see FIG. 7B) in the predetermined direction D1 between the attachment-side connecting surface 22 and the attachment-side engaging portion 21. Note that, in the present disclosure, "same" is not limited to being strictly the same, and some error is allowed.

[0020] Furthermore, the protrusion 3 of the attachment 2 is configured so that it does not interfere with a predetermined type of power tool 1, thereby allowing the attachment side engaging portion 21 to engage with the predetermined type of power tool 1 (see Figure 5), and so that it interferes with a type of power tool Z1 different from the predetermined type of power tool 1, thereby preventing the attachment side engaging portion 21 from engaging with the different type of power tool Z1 (see Figure 6).

[0021] With the above configuration, the attachment 2 is attached to a predetermined type of power tool 1 that is appropriately combined with the attachment 2, and the attachment 2 is not attached to a different type of power tool Z1 that is inappropriately combined with the attachment 2. In other words, the power tool system 100 of this embodiment has the advantage of being able to prevent work from being performed with an inappropriate combination of a power tool and an attachment.

[0022] (2) Detailed configuration (2-1) Power tool system The detailed configuration of the power tool system 100 of this embodiment will be described below with reference to FIGS.

[0023] As shown in Figures 1 and 2, the power tool system 100 of this embodiment includes a predetermined type of power tool 1 and an attachment 2 that can be attached to the predetermined type of power tool 1. The attachment 2 is configured to be attached only to the predetermined type of power tool 1 and is configured not to be attached to a power tool Z1 (see Figure 6) of a type different from the predetermined type of power tool 1. As an example, the predetermined type of power tool 1 is a drill driver, and the different type of power tool Z1 is an impact driver. In the following description, the predetermined type of power tool 1 may also be simply referred to as the "power tool 1."

[0024] (2-2) Power tools The detailed structure of the power tool 1 of this embodiment will be described below with reference to FIGS.

[0025] As shown in FIGS. 1 and 2, the power tool 1 includes a drive unit 11, an output shaft 12, a mounting unit 13, a housing 14, an operation unit 15, and a control unit 16.

[0026] In the following description, the axial direction of the output shaft 12 (see Figures 4 and 5) is defined as the front-rear direction. The side of the main body 141 (described later) on which the attachment portion 13 is provided is defined as the front, and the side on which the attachment portion 13 is not provided is defined as the rear. The above-mentioned predetermined direction D1 is a direction along the front-rear direction. As shown in Figure 2, the direction in which the main body 141 (described later) and the grip portion 142 (described later) are aligned is defined as the up-down direction, with the main body 141 side as viewed from the grip portion 142 defined as the top, and the grip portion 142 side as viewed from the main body 141 defined as the bottom. The direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction. However, these definitions are not intended to define the direction in which the power tool 1 is used.

[0027] (housing) The housing 14 accommodates the drive unit 11 , at least a portion of the output shaft 12 , and the control unit 16 .

[0028] As shown in FIG. 2, the housing 14 has a main body portion 141, a grip portion 142, and a battery mounting portion 143.

[0029] The main body 141 accommodates the drive unit 11 and at least a part of the output shaft 12 .

[0030] As shown in FIG. 5 , the main body 141 has a first side portion 1411, a second side portion 1412, and a bottom portion 1413. The first side portion 1411 and the second side portion 1412 are each cylindrical. The first side portion 1411 and the second side portion 1412 are aligned in the front-rear direction, with the front end of the first side portion 1411 connected to the rear end of the second side portion 1412. The outer diameter of the second side portion 1412 is smaller than the outer diameter of the first side portion 1411. The bottom portion 1413 is disposed so as to cover an opening formed on the rear side of the first side portion 1411. In other words, the main body 141 is a bottomed cylinder having an opening portion 1414 on the front side. The bottom portion 1413 is disk-shaped. The thickness direction of the bottom portion 1413 is aligned with the front-rear direction. At least a portion of the output shaft 12 protrudes forward from the opening portion 1414. The mounting portion 13 is provided around the output shaft 12 between the output shaft 12 and the second side portion 1412. More specifically, the mounting portion 13 is provided between the output shaft 12 and the first side portion 1411 so as to surround the output shaft 12. In other words, the opening 1414 is covered by the output shaft 12 and the mounting portion 13. The detailed structure of the mounting portion 13 will be described later.

[0031] 2, grip portion 142 protrudes from main body portion 141. More specifically, grip portion 142 protrudes downward from main body portion 141. An operator can grasp grip portion 142 to perform work such as screw tightening. An operator can grasp grip portion 142 to perform work such as screw tightening.

[0032] The grip portion 142 of this embodiment houses the control portion 16 .

[0033] The battery mounting section 143 is shaped like a rectangular parallelepiped. As shown in FIG. 2, the battery mounting section 143 is connected to the lower end of the grip section 142. A rechargeable battery pack (not shown) is detachably attached to the battery mounting section 143. The power tool 1 operates using the battery pack as a power source. That is, the battery pack is a power source that supplies power to drive the drive section 11. The battery pack is not a component of the power tool 1. However, the power tool 1 may be equipped with a battery pack. The battery pack includes a battery pack configured by connecting multiple secondary batteries (e.g., lithium ion batteries) in series, and a case that houses the battery pack.

[0034] (Drive unit) The drive unit 11 performs rotational motion. More specifically, the drive unit 11 is driven by power supplied from a power pack attached to the battery mounting unit 143 to perform rotational motion. The drive unit 11 includes a rotor having a drive shaft and a permanent magnet, and a stator having a coil. Electromagnetic interaction between the permanent magnet and the coil causes the rotor to rotate relative to the stator.

[0035] The drive unit 11 is a servo motor. The torque and rotation speed of the drive unit 11 change according to the control by the control unit 16 (servo driver). More specifically, the control unit 16 controls the operation of the drive unit 11 by feedback control, which controls the torque and rotation speed of the drive unit 11 so as to approach target values.

[0036] (output shaft) The output shaft 12 is directly or indirectly connected to the drive shaft of the drive unit 11. As a result, the output shaft 12 rotates in conjunction with the drive shaft of the drive unit 11. In other words, the output shaft 12 is rotated by the drive unit 11.

[0037] The output shaft 12 is a columnar body. The output shaft 12 of this embodiment is cylindrical. As shown in FIG. 5 , at least a portion of the output shaft 12 protrudes from the opening 1414 of the main body 141. More specifically, a front portion of the output shaft 12 protrudes from the opening 1414 of the main body 141.

[0038] The output shaft 12 is configured to be connectable to a transmission mechanism 23 (see FIGS. 3 and 5) of the attachment 2, which will be described later. When the transmission mechanism 23 of the attachment 2 is connected to the output shaft 12, the transmission mechanism 23 is rotated together with the output shaft 12 by the drive unit 11.

[0039] The output shaft 12 also has a holder 121 (see FIGS. 4 and 5) that holds a tool bit (not shown) when the transmission mechanism 23 of the attachment 2 is not connected. The holder 121 is provided at the front end of the output shaft 12. That is, in the power tool 1, the holder 121 of the output shaft 12 can directly hold the tool bit A1. The tool bit held by the holder 121 of the power tool 1 is, for example, a driver bit. When the holder 121 holds the tool bit, the output shaft 12 rotates with the tool bit engaged with a fastener, thereby enabling the fastener to be tightened or loosened.

[0040] (Mounting part) The attachment 2 is attached to the mounting portion 13. As shown in Fig. 4, the mounting portion 13 has a tool-side engaging portion 131 and a tool-side connecting surface 132. The tool-side engaging portion 131 is configured to be able to engage with an attachment-side engaging portion 21 (described later) of the attachment 2. The tool-side connecting surface 132 is a surface with which an attachment-side connecting surface 22 (described later) of the attachment 2 connects when the tool-side engaging portion 131 engages with the attachment-side engaging portion 21 of the attachment 2.

[0041] The shape of the mounting portion 13 will be described in detail below. Figure 5 is a cross-sectional view of the power tool 1 with the attachment 2 attached thereto, as an example.

[0042] As shown in FIG. 5, the attachment portion 13 of this embodiment has a first portion 134 and a second portion 135.

[0043] The first portion 134 has a cylindrical shape with an internal through-hole 1341. The outer diameter of the first portion 134 is approximately the same as the inner diameter of the opening 1414 in the main body 141 of the housing 14. The first portion 134 is disposed so as to cover the opening 1414.

[0044] The through hole 1341 is formed in the front-rear direction. The output shaft 12 is inserted into the through hole 1341 of the first portion 134. That is, the first portion 134 is provided between the output shaft 12 and the second side portion 1412 of the housing 14 so as to surround the output shaft 12.

[0045] In this embodiment, the power tool 1 further includes a plurality of bearings 19 (four in FIG. 5 ). Each of the plurality of bearings 19 rotatably supports (pivotally supports) the output shaft 12. More specifically, as shown in FIG. 1 , each of the plurality of bearings 19 is fitted between the first portion 134 of the mounting portion 13 and the output shaft 12, thereby rotatably supporting the output shaft 12. Specifically, each of the plurality of bearings 19 is a ball bearing.

[0046] The second portion 135 has an annular shape. An inner end of the second portion 135 is connected to the outer circumferential surface of the first portion 134. In other words, the second portion 135 is an annular member that protrudes outward from a portion of the outer circumferential surface of the first portion 134. The rear surface of the second portion 135 is in contact with the front end of the second side portion 1412 of the main body portion 141 of the housing 14.

[0047] As shown in FIG. 5 , the tool-side engaging portion 131 in this embodiment is a convex portion that protrudes outward from the front end of the first portion 134. The tool-side engaging portion 131 in this embodiment is formed around the circumference of the first portion 134. For example, as shown in FIG. 5 , when the attachment 2 is attached to the power tool 1, the rear surface of the tool-side engaging portion 131 engages with the attachment-side engaging portion 21 of the attachment 2, which will be described later. That is, in this embodiment, the rear surface of the tool-side engaging portion 131 is the surface that engages with the attachment-side engaging portion 21 of the attachment 2. With the above configuration, the tool-side engaging portion 131 is configured to be able to engage with the attachment-side engaging portion 21 of the attachment 2.

[0048] The tool side connecting surface 132 in this embodiment is the front surface of the second portion 135. In this embodiment, the tool side connecting surface 132 has an annular shape when viewed from the predetermined direction D1.

[0049] As shown in FIG. 4 , the tool-side connecting surface 132 is provided with tool-side protrusions 133, which are protrusions that protrude in the predetermined direction D1. That is, the tool-side protrusions 133 are provided on the front surface of the second portion 135. The tool-side connecting surface 132 of this embodiment is provided with a plurality of tool-side protrusions 133. In other words, the tool-side connecting surface 132 of this embodiment has a plurality of tool-side protrusions 133. The multiple tool-side protrusions 133 are provided in an annular shape along the circumference of the tool-side connecting surface 132. More specifically, the multiple tool-side protrusions 133 are provided at equal intervals in an annular shape along the circumference of the tool-side connecting surface 132. When viewed from the predetermined direction D1, each of the multiple tool-side protrusions 133 has a shape obtained by dividing a circle. This configuration has the effect of further strengthening the attachment 2. As a result, there is an advantage in that the tightening operation can be performed stably.

[0050] 7A is a schematic development of a portion of the cross section of the tool-side connecting surface 132, on which the tool-side protrusion 133 is arranged, taken along the cross-sectional line L1 shown in FIG. 3 of the power tool 1. The dotted line Y1 shown in FIG. 7A indicates the position of the tool-side engaging portion 131 of the power tool 1 in the predetermined direction D1. More specifically, the dotted line Y1 shown in FIG. 7A indicates the position of the rear surface of the tool-side engaging portion 131 of the power tool 1 (i.e., the surface that engages with the attachment-side engaging portion 21 of the attachment 2) in the predetermined direction D1, as shown in FIG. 5. Because FIG. 7A is a schematic view, it does not reflect the dimensional ratios of FIGS. 4 and 5.

[0051] 7A, each of the multiple tool side protrusions 133 is provided in a tapered shape that narrows from the end connected to the tool side connecting surface 132 toward the tip of the tool side protrusion 133. Here, the "end connected to the tool side connecting surface 132" refers to the rear end of each of the multiple tool side protrusions 133, and the "tip of the tool side protrusion 133" refers to the front end of each of the multiple tool side protrusions 133. This configuration has the advantage of making it easier to attach the attachment 2.

[0052] A tool-side first dimension X11 (see FIG. 7A) in the predetermined direction D1 between the tool-side connecting surface 132 and the tool-side engaging portion 131 (i.e., dotted line Y1 shown in FIG. 7A) in the power tool 1 is the same as a tool-side first dimension X21 (see FIG. 7B) in the predetermined direction D1 between the tips of the attachment-side protrusions 221 and the attachment-side engaging portion 21 (i.e., dotted line Y2 shown in FIG. 7B) in the attachment 2 described later. Furthermore, a tool-side second dimension X12 (see FIG. 7A) in the predetermined direction D1 between the tips of the tool-side protrusions 133 and the tool-side engaging portion 131 is the same as a tool-side second dimension X22 (see FIG. 7B) in the predetermined direction D1 between the attachment-side connecting surface 22 and the attachment-side engaging portion 21 in the attachment 2 described later.

[0053] 8, when the power tool 1 and the attachment 2 are brought close enough to come into contact in the predetermined direction D1, the dotted line Y1 and the dotted line Y2 overlap. In other words, when the power tool 1 and the attachment 2 are brought close enough to come into contact in the predetermined direction D1, the attachment-side engaging portion 21 of the attachment 2 comes into contact with the tool-side engaging portion 131 of the power tool 1. As a result, when the power tool 1 and the attachment 2 are brought close enough to come into contact in the predetermined direction D1, the attachment-side engaging portion 21 of the attachment 2 engages with the tool-side engaging portion 131 of the power tool 1, and the attachment 2 is attached to the power tool 1.

[0054] (Operation unit) As shown in FIG. 2, the operating unit 15 protrudes from the grip portion 142. The operating unit 15 receives operations for controlling the rotation of the drive shaft of the drive unit 11. The drive unit 11 can be switched on and off by pulling the operating unit 15. The rotation speed of the drive shaft can be adjusted by the amount of pulling the operating unit 15. The greater the amount of pulling, the faster the rotation speed of the drive shaft of the drive unit 11.

[0055] (Control unit) The control unit 16 rotates or stops the drive shaft of the drive unit 11 according to the pulling amount of the operation of pulling the operation unit 15, and also controls the rotation speed of the drive shaft.

[0056] The control unit 16 includes, for example, a microcontroller. The control unit 16 can change the rotation speed of the output shaft 12 by changing the rotation speed of the drive shaft of the drive unit 11. The control unit 16 changes the rotation speed of the drive shaft of the drive unit 11, for example, by changing the power supplied to the drive unit 11.

[0057] (2-3) Attachment The attachment 2 is an attachment that can be attached only to a predetermined type of power tool 1. In other words, the combination of the attachment 2 with the predetermined type of power tool 1 is appropriate, but the combination of the attachment 2 with a power tool Z1 of a type different from the predetermined type of power tool 1 is inappropriate.

[0058] In the following description, it is assumed that the attachment 2 has a structure for holding a tool bit of a different shape or size than the tool bit held by the holding portion 121 of the power tool 1. In other words, it is assumed that the attachment 2 is a keyless chuck attachment. Note that the attachment 2 may have a structure for changing the position or orientation of the tool bit held by the holding portion 121 of the power tool 1 to facilitate tightening work at various angles. The attachment 2 may also have a function for measuring torque or a function for counting the number of tightening operations.

[0059] 1, the attachment 2 includes an attachment-side engaging portion 21, an attachment-side connecting surface 22, a transmission mechanism 23, a rotating shaft 24, a housing 25, and a protrusion 3. When the attachment 2 is attached to a predetermined type of power tool 1, the predetermined type of power tool 1 and the attachment 2 are aligned in a predetermined direction D1 (front-rear direction).

[0060] (housing) The housing 25 accommodates the attachment side engaging portion 21, the transmission mechanism 23, and at least a part of the rotation shaft 24. The housing 25 is cylindrical.

[0061] 3 and 5, the housing 25 has a first portion 251 and a second portion 252. The first portion 251 and the second portion 252 are each cylindrical in shape.

[0062] The first portion 251 and the second portion 252 are aligned in the front-rear direction, with the front end of the first portion 251 connected to the rear end of the second portion 252. In this embodiment, the outer diameter of the first portion 251 is substantially constant in the front-rear direction. In this embodiment, the outer diameter of the second portion 252 decreases from the rear end to the front end. As shown in FIG. 2, a through-hole 253 extending in the front-rear direction is formed at the front end of the second portion 252. The rotary shaft 24 is inserted through the through-hole 253.

[0063] 3 and 5, the second portion 252 has an operating unit 254 that accepts an operation to fix or release the state in which the holding portion 241 (described later) holds the tool bit. The operating unit 254 is provided around the circumference of the second portion 252. By turning the operating unit 254 clockwise as viewed from the front, the state in which the holding portion 241 holds the tool bit is fixed. On the other hand, by turning the operating unit 254 counterclockwise as viewed from the front, the state in which the holding portion 241 holds the tool bit is released.

[0064] (Attachment side engagement part) The attachment-side engaging portion 21 is configured to be engageable with the tool-side engaging portion 131 provided on the power tool 1. As shown in FIGS. 3 and 5, the attachment 2 of this embodiment has two attachment-side engaging portions 21. The two attachment-side engaging portions 21 are arranged side by side in the vertical direction. Each of the two attachment-side engaging portions 21 has a plate piece 211 and an operating portion 212.

[0065] Each of the two plate pieces 211 protrudes inward. The thickness direction of the two plate pieces 211 is aligned with the predetermined direction D1. In this embodiment, as shown in FIG. 3, each of the two plate pieces 211 is a long plate-like member whose longitudinal direction curves along the circumferential direction of the first portion 251 of the housing 25. The plate piece 211 in the upper attachment-side engaging portion 21 protrudes downward, while the plate piece 211 in the lower attachment-side engaging portion 21 protrudes upward. As shown in FIG. 5, when the attachment 2 is attached to the power tool 1, the front surfaces of the plate pieces 211 in each of the two attachment-side engaging portions 21 engage with the rear surfaces of the tool-side engaging portions 131. That is, in this embodiment, the front surfaces of the plate pieces 211 are surfaces that engage with the tool-side engaging portions 131 of the power tool 1. With the above configuration, the two attachment-side engaging portions 21 are configured to be engageable with the tool-side engaging portions 131 of the power tool 1.

[0066] In this embodiment, each of the two attachment-side engaging portions 21 is configured such that the engagement between the plate piece 211 and the tool-side engaging portion 131 is released when the operating portion 212 is slid forward.

[0067] (Attachment side connection surface) As shown in FIGS. 3 and 5, the attachment 2 of this embodiment further includes an annular member 220 that is a ring-shaped member. The outer diameter of the annular member 220 is approximately equal to the inner diameter of the first portion 251 of the housing 25. The dimension of the annular member 220 when viewed in a predetermined direction D1 (front-rear direction) is approximately equal to the dimension of the second portion 135 (see FIG. 4) of the mounting portion 13 of the power tool 1 when viewed in the predetermined direction D1. The annular member 220 is disposed in the opening of the housing 25 such that an outer end face of the annular member 220 contacts an inner surface of the first portion 251 of the housing 25. As shown in FIG. 5, when the attachment 2 is attached to the power tool 1, an inner end face of the annular member 220 contacts a front portion of the second portion 135 of the first portion 134 of the mounting portion 13 of the power tool 1.

[0068] In this embodiment, the rear surface of the annular member 220 is the attachment-side connecting surface 22 that is connected to the tool-side connecting surface 132 of the power tool 1 when the attachment-side engaging portion 21 is engaged with the tool-side engaging portion 131. In this embodiment, the shape of the attachment-side connecting surface 22 when viewed from the predetermined direction D1 is annular.

[0069] The attachment side connecting surface 22 is provided with attachment side protrusions 221 (see FIG. 3 ), which are protrusions that are arranged to engage with the tool side protrusions 133 of the power tool 1 and protrude in a predetermined direction D1. In this embodiment, the attachment side connecting surface 22 is provided with a plurality of attachment side protrusions 221. The plurality of attachment side protrusions 221 are provided in a ring shape along the circumference of the tool side connecting surface 132. More specifically, the plurality of attachment side protrusions 221 are provided in a ring shape at equal intervals along the circumference of the tool side connecting surface 132.

[0070] 7B is a schematic development of a portion of the cross section along the cross-sectional line L2 shown in FIG. 3 of the attachment-side connecting surface 22 of the attachment 2, on which the multiple attachment-side protrusions 221 are arranged. The dotted line Y2 shown in FIG. 7B indicates the position, in the predetermined direction D1, at which the attachment-side engaging portion 21 (see FIG. 6) of the attachment 2 is provided. More specifically, the dotted line Y2 shown in FIG. 7B indicates the position, in the predetermined direction D1, of the front surface of the plate piece 211 of the attachment-side engaging portion 21 of the attachment 2 (i.e., the surface that engages with the tool-side engaging portion 131 of the power tool 1).

[0071] 7B , each of the attachment side protrusions 221 is tapered such that the width narrows from the end connected to the attachment side connecting surface 22 toward the tip of the attachment side protrusion 221. Here, the "end connected to the attachment side connecting surface 22" refers to the front end of each of the attachment side protrusions 221, and the "tip of the attachment side protrusion 221" refers to the rear end of each of the attachment side protrusions 221. This configuration has the advantage of making it easier to attach to the power tool 1.

[0072] A first attachment dimension X21 (see FIG. 7B) in the predetermined direction D1 between the tips of the attachment protrusions 221 of the attachment 2 and the attachment engaging portion 21 (i.e., dotted line Y2 shown in FIG. 7B) is the same as a first tool dimension X11 (see FIG. 7A) in the predetermined direction D1 between the tool connecting surface 132 and the tool engaging portion 131 (i.e., dotted line Y1 shown in FIG. 7A) of the power tool 1. Furthermore, a second attachment dimension X22 (see FIG. 7B) in the predetermined direction D1 between the attachment connecting surface 22 and the attachment engaging portion 21 of the attachment 2 is the same as a second tool dimension X12 (see FIG. 7A) in the predetermined direction D1 between the tips of the tool protrusions 133 and the tool engaging portion 131.

[0073] (protrusion) In this embodiment, as shown in FIG. 5 , when the attachment 2 is attached to the power tool 1, the housing 25 has an end 255 located on the power tool 1 side in the predetermined direction D1, and the protrusion 3 protrudes from the end 255 located on the power tool 1 side of the housing 25 toward the outside of the housing 25. More specifically, the protrusion 3 protrudes from the outer circumferential surface of the end 255 located on the power tool 1 side of the housing 25 toward the outside of the housing 25. Note that the "end 255 located on the power tool 1 side" here refers more specifically to the rear end of the first portion 251 of the housing 25, i.e., the end of the first portion 251 of the housing 25 that is opposed to each other in the predetermined direction D1 (front-rear direction) and is not connected to the second portion 252. The dimension of the protrusion 3 in the protruding direction (radial direction of the housing 25) is preferably 1.0 to 1.5 mm.

[0074] As shown in Fig. 5, when the attachment 2 is attached to a predetermined type of power tool 1, the protrusion 3 of this embodiment does not come into contact with (i.e., does not interfere with) the second side portion 1412 of the main body 141 of the housing 14 of the predetermined type of power tool 1 before the attachment side engaging portion 21 engages with the tool side engaging portion 131 of the predetermined type of power tool 1. On the other hand, as shown in Fig. 6, when the attachment 2 is attached to a power tool Z1 of a type different from the predetermined type of power tool 1, the protrusion 3 of this embodiment comes into contact with (i.e., interferes with) the front end portion of the housing Z2 of the power tool Z1 before the attachment side engaging portion 21 engages with the tool side engaging portion Z3 of the power tool Z1. In other words, the protrusion 3 of this embodiment is configured so that it does not interfere with a predetermined type of power tool 1, thereby allowing the attachment side engaging portion 21 to engage with the tool side engaging portion 131 of the predetermined type of power tool 1 (see Figure 5), and so that it interferes with a type of power tool Z1 different from the predetermined type of power tool 1, thereby preventing the attachment side engaging portion 21 from engaging with the tool side engaging portion Z3 of the different type of power tool Z1 (see Figure 6).

[0075] According to the above configuration, the simple structure of the protrusion 3 allows the attachment 2 to be attached to a predetermined type of power tool 1 that is appropriately combined with the attachment 2, and prevents the attachment 2 from being attached to a different type of power tool Z1 that is inappropriately combined with the attachment 2. In other words, there is an advantage in that it is easy to prevent work from being performed when the power tool and attachment are not appropriately combined.

[0076] Furthermore, the protrusion 3 of this embodiment is provided around the entire circumference of the end 255 of the housing 25 located on the power tool 1 side. That is, the shape of the protrusion 3 of this embodiment when viewed from the predetermined direction D1 is annular. With this configuration, when the attachment 2 is attached to a different type of power tool Z1, the protrusion 3 of this embodiment is likely to come into contact with the front end of the housing Z2 of the different type of power tool Z1 before the attachment side engaging portion 21 engages with the tool side engaging portion Z3 of the different type of power tool Z1. That is, the attachment side engaging portion 21 is reliably prevented from engaging with the tool side engaging portion Z3 of the different type of power tool Z1. This has the advantage of further preventing work from being performed when the power tool and attachment are not properly combined.

[0077] (Transmission mechanism) When the attachment-side engaging portion 21 is engaged with the tool-side engaging portion 131 of the power tool 1, the transmission mechanism 23 transmits the rotation of the output shaft 12 of the power tool 1 to the rotating shaft 24. More specifically, when the attachment-side engaging portion 21 is engaged with the tool-side engaging portion 131 of the power tool 1, the transmission mechanism 23 transmits the rotation of the output shaft 12 of the power tool 1 to the rotating shaft 24, thereby rotating the rotating shaft 24. As shown in FIG. 6 , the rear end of the transmission mechanism 23 is configured to be connectable to the front end of the output shaft 12 of the power tool 1.

[0078] (rotation axis) When the attachment-side engaging portion 21 is engaged with the tool-side engaging portion 131 of the power tool 1, the rotating shaft 24 rotates in conjunction with the output shaft 12 of the power tool 1. More specifically, when the attachment-side engaging portion 21 is engaged with the tool-side engaging portion 131 of the power tool 1, the rotation of the output shaft 12 of the power tool 1 is transmitted to the rotating shaft 24 by the transmission mechanism 23, causing the rotating shaft 24 to rotate.

[0079] The rotary shaft 24 is cylindrical. In this embodiment, the axial direction of the rotary shaft 24 is along the front-rear direction, which is the same as the axial direction of the output shaft 12. As shown in FIG. 2 , at least a portion of the rotary shaft 24 protrudes from the through-hole 253 of the second portion 252 of the housing 25. More specifically, a front portion of the rotary shaft 24 protrudes from the through-hole 253 of the second portion 252 of the housing 25.

[0080] The rotating shaft 24 has a holding portion 241 (see FIG. 2) that holds a tool bit of a different shape or size than the tool bit held by the holding portion 121 of the power tool 1. The holding portion 241 is provided at the front end of the output shaft 12. The tool bit is, for example, a driver bit. When the holding portion 241 holds the tool bit, the tool bit is engaged with a fastening part and the rotating shaft 24 rotates, thereby enabling the fastening part to be tightened or loosened.

[0081] (3) Effects The attachment 2 of the power tool system 100 according to this embodiment includes a protrusion 3. The protrusion 3 is configured so that the attachment-side engaging portion 21 can engage with a power tool 1 of a predetermined type by not interfering with the power tool 1 of that predetermined type (see FIG. 5), and so that the attachment-side engaging portion 21 cannot engage with a power tool Z1 of a different type by interfering with the power tool 1 of that predetermined type (see FIG. 6). This allows the attachment 2 to be attached to a power tool 1 of a predetermined type that is appropriately combined with the attachment 2, but not to a power tool Z1 of a different type that is inappropriately combined with the attachment 2. In other words, the power tool system 100 according to this embodiment has the advantage of being able to prevent work from being performed when the power tool and attachment are not appropriately combined.

[0082] In the attachment 2 of the power tool system 100 according to this embodiment, the protrusion 3 protrudes from the end 255 located on the power tool 1 side of the housing 25 toward the outside of the housing 25. This allows the simple structure of the protrusion 3 to attach the attachment 2 to a predetermined type of power tool 1 that is an appropriate combination with the attachment 2, and to prevent the attachment 2 from being attached to a different type of power tool Z1 that is an inappropriate combination with the attachment 2. In other words, this has the advantage of easily preventing work from being performed when the power tool and attachment are inappropriately combined.

[0083] In the attachment 2 of the power tool system 100 according to this embodiment, the protrusion 3 is provided around the entire circumference of the end 255 of the housing 25 that is located on the power tool 1 side. As a result, when the attachment 2 is attached to a different type of power tool Z1, the protrusion 3 of this embodiment is likely to come into contact with the front end of the housing Z2 of the different type of power tool Z1 before the attachment side engaging portion 21 engages with the tool side engaging portion Z3 of the different type of power tool Z1. In other words, the attachment side engaging portion 21 is reliably prevented from engaging with the tool side engaging portion Z3 of the different type of power tool Z1. This has the advantage of further preventing work from being performed when the power tool and attachment are not properly combined.

[0084] The predetermined type of power tool 1 in the power tool system 100 according to this embodiment is a drill driver. As a result, an attachment 2 that is suitable for a drill driver is attached to the power tool 1 that is a drill driver, and an attachment that is not suitable for a drill driver is not attached. Therefore, the power tool system 100 according to this embodiment has the advantage of being able to prevent work from being performed with an inappropriate combination of the power tool 1 that is a drill driver and an attachment.

[0085] (4) Variations The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. The following modified examples may be realized in appropriate combination. The same components as those in the above-described first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0086] (4-1) First Modification In the attachment 2 of the power tool system 100 of the above-described embodiment, the protrusion 3 protrudes from the end 255 located on the power tool 1 side of the housing 25 toward the outside of the housing 25. However, as shown in Figures 9 and 10, in the attachment 2A of the power tool system 100A of the first modified example, the protrusion 3A protrudes from the end 255 located on the power tool 1 side of the housing 25 toward the power tool 1 in the predetermined direction D1 (front-rear direction).

[0087] More specifically, the protrusion 3A protrudes from the rear surface of the end 255 of the housing 25 located on the power tool 1 side toward the power tool 1 in the predetermined direction D1 (front-rear direction). That is, the protrusion 3A is a portion that extends from the end 255 located on the power tool 1 side of the housing 25 toward the power tool 1 in the predetermined direction D1 (front-rear direction). The dimension of the protrusion 3A in the protruding direction (front-rear direction) is preferably 1.0 to 1.5 mm.

[0088] As shown in Fig. 9, when the attachment 2A is attached to a predetermined type of power tool 1, the protrusion 3A of this embodiment does not contact (i.e., does not interfere with) the second side portion 1412 of the main body 141 of the housing 14 of the predetermined type of power tool 1 before the attachment side engaging portion 21 engages with the tool side engaging portion 131 of the predetermined type of power tool 1. On the other hand, as shown in Fig. 10, when the attachment 2A is attached to a different type of power tool Z1, the protrusion 3 of this embodiment is inserted into the groove Z31 of the mounting portion Z30 in which the tool side engaging portion Z3 is provided, and contacts (i.e., interferes with) the bottom surface of the groove Z31 before the attachment side engaging portion 21 engages with the tool side engaging portion Z3 of the different type of power tool Z1. That is, the protrusion 3A of the first modified example is configured so that the attachment side engaging portion 21 can engage with the tool side engaging portion 131 of the predetermined type of power tool 1 by not interfering with the predetermined type of power tool 1 (see FIG. 9), and so that the attachment side engaging portion 21 cannot engage with the tool side engaging portion 131 of the different type of power tool Z1 by interfering with the power tool Z1 of a type different from the predetermined type of power tool 1 (see FIG. 10). Note that the groove Z31 of the different type of power tool Z1 referred to here is formed on the front surface of the mounting portion Z30.

[0089] According to the above configuration, the simple structure of the protrusion 3A allows the attachment 2A to be attached to a predetermined type of power tool 1 that is appropriately combined with the attachment 2A, and prevents the attachment 2A from being attached to a different type of power tool Z1 that is inappropriately combined with the attachment 2A. In other words, there is an advantage in that it is easy to prevent work from being performed when the power tool and attachment are not appropriately combined.

[0090] Furthermore, the protrusion 3A of this embodiment is provided around the entire circumference of the end 255 of the housing 25 located on the power tool 1 side. That is, the protrusion 3A of this embodiment is a portion that extends around the entire circumference of the end 255 of the housing 25 located on the power tool 1 side toward the power tool 1 in the predetermined direction D1 (front-rear direction). With this configuration, when the attachment 2A is attached to a different type of power tool Z1, the protrusion 3A of this embodiment is likely to come into contact with the front end of the housing Z2 of the different type of power tool Z1 before the attachment side engaging portion 21 engages with the tool side engaging portion Z3 of the different type of power tool Z1. That is, the attachment side engaging portion 21 is reliably prevented from engaging with the tool side engaging portion Z3 of the different type of power tool Z1. This has the advantage of further preventing work from being performed when the power tool and attachment are not properly combined.

[0091] (4-2) Other Modifications Other variations of the above-described embodiment are listed below. The following variations may be realized in appropriate combination.

[0092] In the above-described embodiment, the protrusions 3 are provided around the entire circumference of the end 255 of the housing 25 located on the power tool 1 side. However, the protrusions 3 may be provided at two positions facing each other in the vertical direction on the end 255 located on the power tool 1 side. More specifically, the protrusions 3 may protrude toward the outside of the housing 25 from two positions facing each other in the vertical direction on the outer circumferential surface of the end 255 located on the power tool 1 side of the housing 25. Furthermore, the protrusions 3 may be provided at two positions facing each other in the horizontal direction on the end 255 located on the power tool 1 side of the housing 25. More specifically, the protrusions 3 may protrude toward the outside of the housing 25 from two positions facing each other in the horizontal direction on the outer circumferential surface of the end 255 located on the power tool 1 side of the housing 25.

[0093] Furthermore, it is sufficient that the protrusion 3 is provided at at least one position on the end portion 255 located on the power tool 1 side of the housing 25. In other words, it is sufficient that the protrusion 3 protrudes from at least one position on the outer circumferential surface of the end portion 255 located on the power tool 1 side of the housing 25 toward the outside of the housing 25.

[0094] Although the tool side connecting surface 132 in the above-described embodiment is provided with a plurality of tool side protrusions 133, it is sufficient to provide at least one tool side protrusion 133. In other words, the number of tool side protrusions 133 is not limited.

[0095] Similarly, although a plurality of attachment side protrusions 221 are provided on the attachment side connecting surface 22 in the above-described embodiment, it is sufficient to provide at least one attachment side protrusion 221. In other words, the number of attachment side protrusions 221 is not limited.

[0096] In the above-described embodiment, the predetermined type of power tool 1 is a drill driver, but is not limited to a drill driver. For example, the type of power tool 1 may be an impact driver, an impact wrench, a hammer drill, a band saw, a power cutter, a sander, a disc grinder, etc.

[0097] (summary) The power tool system (100, 100A) of the first aspect is a power tool system including a predetermined type of power tool (1) and an attachment (2, 2A) attached to the predetermined type of power tool (1). The attachment (2, 2A) includes an attachment-side engaging portion (21), an attachment-side connecting surface (22), and a protrusion (3, 3A). The attachment-side engaging portion (21) engages with the predetermined type of power tool (1). The attachment-side connecting surface (22) connects to the predetermined type of power tool (1) when the attachment-side engaging portion (21) engages with the predetermined type of power tool (1). The predetermined type of power tool (1) includes a drive unit (11), an output shaft (12), and a mounting portion (13). The output shaft (12) is rotated by the drive unit (11). The mounting portion (13) is provided around the output shaft (12) and has an attachment (2, 2A) attached thereto. The mounting portion (13) has a tool-side engaging portion (131) and a tool-side connecting surface (132). The tool-side engaging portion (131) is configured to be engageable with the attachment-side engaging portion (21). When the tool-side engaging portion (131) is engaged with the attachment-side engaging portion (21), the tool-side connecting surface (132) connects to the attachment-side connecting surface (22). When the attachment (2, 2A) is attached to a predetermined type of power tool (1), the predetermined type of power tool (1) and the attachment (2, 2A) are aligned in a predetermined direction (D1). The tool-side connecting surface (132) has at least one tool-side convex portion (133) that is a convex portion that protrudes in the predetermined direction (D1). The attachment side connecting surface (22) is provided with at least one attachment side protrusion (221) that is a protrusion that protrudes in a predetermined direction (D1) and is arranged so that the attachment side connecting surface (22) engages with at least one tool side protrusion (133). A first tool side dimension (X11) in the predetermined direction (D1) between the tool side connecting surface (132) and the tool side engaging portion (131) is the same as a first attachment side dimension (X21) in the predetermined direction (D1) between a tip of the at least one attachment side protrusion (221) and the attachment side engaging portion (21).A tool-side second dimension (X12) in the predetermined direction (D1) between the tip of at least one tool-side protrusion (133) and the tool-side engagement portion (131) is the same as an attachment-side second dimension (X22) in the predetermined direction (D1) between the attachment-side connection surface (22) and the attachment-side engagement portion (21). The protrusions (3, 3A) are configured so as not to interfere with a predetermined type of power tool (1), thereby enabling the attachment-side engagement portion (21) to engage with the predetermined type of power tool (1), and so as to interfere with a type of power tool (Z1) different from the predetermined type of power tool (1), thereby disabling the attachment-side engagement portion (21) to engage with the different type of power tool (Z1).

[0098] This embodiment has the advantage that it is possible to prevent work from being performed in an inappropriate combination with the attachment (2, 2A).

[0099] In the power tool system (100) of the second aspect, the attachment (2) in the first aspect further includes a cylindrical housing (25) that houses the attachment-side engaging portion (21). The housing (25) has an end portion (255) that is located on the side of the predetermined type of power tool (1) in the predetermined direction (D1) when the attachment (2) is attached to the predetermined type of power tool (1). The protrusion (3) protrudes from the end portion (255) toward the outside of the housing (25).

[0100] This embodiment has the advantage that it is possible to easily prevent work from being performed when the combination of the power tool (1) and the attachment (2) is not appropriate.

[0101] In the power tool system (100) of the third embodiment, the protrusion (3) is provided around the entire periphery of the end (255) in the second embodiment.

[0102] This embodiment has the advantage of further preventing work from being performed when the combination of the power tool (1) and the attachment (2) is inappropriate.

[0103] In the power tool system (100A) of the fourth aspect, the attachment (2A) of the first aspect further includes a cylindrical housing (25) that houses the attachment-side engaging portion (21). The housing (25) has an end portion (255) that is located on the side of the predetermined type of power tool (1) in the predetermined direction (D1) when the attachment (2A) is attached to the predetermined type of power tool (1). The protrusion (3A) protrudes from the end portion (255) toward the predetermined type of power tool (1) in the predetermined direction (D1).

[0104] This embodiment has the advantage that it is possible to easily prevent work from being performed when the combination of the power tool (1) and the attachment (2A) is not appropriate.

[0105] In the power tool system (100A) of the fifth embodiment, the protrusions (3, 3A) are provided around the entire periphery of the end portion (255) in the fourth embodiment.

[0106] This embodiment has the advantage of further preventing work from being performed when the power tool (1) and the attachment (2A) are not properly combined.

[0107] In the power tool system (100, 100A) of the sixth aspect, in any one of the first to fifth aspects, the predetermined type of power tool (1) is a drill driver.

[0108] This embodiment has the advantage of preventing work from being performed in an inappropriate combination of the power tool (1) that is a drill driver and the attachment (2, 2A).

[0109] The seventh embodiment of the attachment (2, 2A) is an attachment that is attached to a predetermined type of power tool (1). The seventh embodiment of the attachment (2, 2A) includes an attachment-side engaging portion (21), an attachment-side connecting surface (22), and a protrusion (3, 3A). The attachment-side engaging portion (21) engages with a tool-side engaging portion (131) that is included in the predetermined type of power tool (1). When the attachment-side engaging portion (21) engages with the tool-side engaging portion (131), the attachment-side connecting surface (22) connects to a tool-side connecting surface (132) that is included in the predetermined type of power tool (1). When the attachment (2, 2A) is attached to the predetermined type of power tool (1), the predetermined type of power tool (1) and the attachment (2, 2A) are aligned in a predetermined direction (D1). The tool side connecting surface (132) is provided with at least one tool side protrusion (133) that is a protrusion that protrudes in a predetermined direction (D1). The attachment side connecting surface (22) is provided with at least one attachment side protrusion (221) that is a protrusion that protrudes in the predetermined direction (D1) and is arranged so that the attachment side connecting surface (22) engages with the at least one tool side protrusion (133). A first attachment side dimension (X21) in the predetermined direction (D1) between a tip of the at least one attachment side protrusion (221) and the attachment side engaging portion (21) is the same as a first tool side dimension (X11) in the predetermined direction (D1) between the tool side connecting surface (132) and the tool side engaging portion (131). The attachment-side second dimension (X22) in the predetermined direction (D1) between the attachment-side connecting surface (22) and the attachment-side engaging portion (21) is the same as the tool-side second dimension (X12) in the predetermined direction (D1) between the tip of at least one tool-side protrusion (133) and the tool-side engaging portion (131). The protrusions (3, 3A) are configured so as not to interfere with the predetermined type of power tool (1), thereby allowing the attachment-side engaging portion (21) to engage with the predetermined type of power tool (1), and so as to interfere with a type of power tool (Z1) different from the predetermined type of power tool (1), thereby preventing the attachment-side engaging portion (21) from engaging with the different type of power tool (Z1).

[0110] This embodiment has the advantage that it is possible to easily prevent work from being performed when the combination of the power tool (1) and the attachment (2, 2A) is not appropriate.

[0111] The attachment (2) of the eighth aspect is the same as the attachment (2) of the seventh aspect, but further includes a cylindrical housing (25) that houses the attachment-side engaging portion (21). The housing (25) has an end portion (255) that is located on the side of the predetermined type of power tool (1) in the predetermined direction (D1) when the attachment (2) is attached to the predetermined type of power tool (1). The protrusion (3) protrudes from the end portion (255) toward the outside of the housing (25).

[0112] This embodiment has the advantage that it is possible to easily prevent work from being performed when the combination of the power tool (1) and the attachment (2) is not appropriate.

[0113] In the attachment (2) of the ninth embodiment, the protrusion (3) is provided around the entire periphery of the end (255) in the eighth embodiment.

[0114] This embodiment has the advantage of further preventing work from being performed when the combination of the power tool (1) and the attachment (2) is inappropriate.

[0115] The attachment (2A) of the tenth aspect is the same as the attachment (2A) of the seventh aspect, but further includes a cylindrical housing (25) that houses the attachment-side engaging portion (21). The housing (25) has an end portion (255) that is located on the side of the predetermined type of power tool (1) in the predetermined direction (D1) when the attachment (2A) is attached to the predetermined type of power tool (1). The protrusion (3A) protrudes from the end portion (255) in the predetermined direction (D1) toward the predetermined type of power tool (1).

[0116] This embodiment has the advantage that it is possible to easily prevent work from being performed when the combination of the power tool (1) and the attachment (2A) is not appropriate.

[0117] In the attachment (2A) of the eleventh embodiment, in the tenth embodiment, the protrusion (3A) is provided around the entire periphery of the end (255).

[0118] This embodiment has the advantage of further preventing work from being performed when the power tool (1) and the attachment (2A) are not properly combined. [Explanation of symbols]

[0119] 100, 100A Power Tool System 1 Power tools 11 Drive unit 12 Output shaft 13 Mounting part 131 Tool side engagement part 132 Tool side connection surface 133 Tool side protrusion 2. 2A attachment 21 Attachment side engagement portion 22 Attachment side connection surface 25 Housing 3, 3A protrusion 221 Attachment side convex part 255 End D1 Specified direction X11 Tool side first dimension X12 Tool side second dimension X21 Attachment side first dimension X22 Attachment side second dimension Z1 power tools Z2 Housing Z3 Tool side engagement part Z30 mounting part

Claims

1. A power tool system including a predetermined type of power tool and an attachment that can be attached to the predetermined type of power tool, The attachment is an attachment side engaging portion that engages with the predetermined type of power tool; an attachment-side connecting surface that connects to the predetermined type of power tool when the attachment-side engaging portion is engaged with the predetermined type of power tool; a protrusion, The predetermined type of power tool is A drive unit; an output shaft rotated by the drive unit; a mounting portion provided around the output shaft and to which the attachment is attached, The mounting portion is a tool-side engaging portion configured to be engageable with the attachment-side engaging portion; a tool-side connecting surface that connects to the attachment-side connecting surface when the tool-side engaging portion is engaged with the attachment-side engaging portion, When the attachment is attached to the predetermined type of power tool, the predetermined type of power tool and the attachment are aligned in a predetermined direction, The tool-side connection surface is provided with at least one tool-side convex portion that is a convex portion that protrudes in the predetermined direction, the attachment side connection surface is provided with at least one attachment side convex portion that is a convex portion that is arranged so that the attachment side connection surface engages with the at least one tool side convex portion and that protrudes in the predetermined direction; a tool-side first dimension in the predetermined direction between the tool-side connection surface and the tool-side engagement portion is the same as an attachment-side first dimension in the predetermined direction between a tip of the at least one attachment-side protrusion and the attachment-side engagement portion, a tool-side second dimension in the predetermined direction between a tip of the at least one tool-side protrusion and the tool-side engaging portion is the same as an attachment-side second dimension in the predetermined direction between the attachment-side connecting surface and the attachment-side engaging portion, The protrusion is A structure in which the attachment side engaging portion can be engaged with the predetermined type of power tool by not interfering with the predetermined type of power tool, and The attachment-side engaging portion is configured to be unable to engage with a power tool of a different type when it interferes with the power tool of the predetermined type. Power tool system.

2. The attachment further includes a cylindrical housing that accommodates the attachment side engaging portion, the housing has an end portion that is located on the predetermined type of power tool side in the predetermined direction when the attachment is attached to the predetermined type of power tool, The protrusion protrudes from the end toward the outside of the housing. The power tool system of claim 1 .

3. The protrusion is provided around the entire periphery of the end portion. The power tool system of claim 2 .

4. The attachment further includes a cylindrical housing that accommodates the attachment side engaging portion, the housing has an end portion that is located on the predetermined type of power tool side in the predetermined direction when the attachment is attached to the predetermined type of power tool, The protruding portion protrudes from the end portion along the predetermined direction toward the predetermined type of power tool. The power tool system of claim 1 .

5. The protrusion is provided around the entire periphery of the end portion. The power tool system of claim 4 .

6. The predetermined type of power tool is a drill driver. The power tool system of claim 1 .

7. An attachment that can be attached to a predetermined type of power tool, an attachment-side engaging portion that engages with a tool-side engaging portion provided on the predetermined type of power tool; an attachment-side connecting surface that connects to a tool-side connecting surface of the predetermined type of power tool when the attachment-side engaging portion is engaged with the tool-side engaging portion; a protrusion, When the attachment is attached to the predetermined type of power tool, the predetermined type of power tool and the attachment are aligned in a predetermined direction, The tool-side connection surface is provided with at least one tool-side convex portion that is a convex portion that protrudes in the predetermined direction, the attachment side connection surface is provided with at least one attachment side convex portion that is a convex portion that is arranged so that the attachment side connection surface engages with the at least one tool side convex portion and that protrudes in the predetermined direction; an attachment-side first dimension in the predetermined direction between a tip of the at least one attachment-side protrusion and the attachment-side engaging portion is the same as a tool-side first dimension in the predetermined direction between the tool-side connecting surface and the tool-side engaging portion; an attachment-side second dimension in the predetermined direction between the attachment-side connection surface and the attachment-side engagement portion is the same as a tool-side second dimension in the predetermined direction between a tip of the at least one tool-side convex portion and the tool-side engagement portion; The protrusion is A structure in which the attachment side engaging portion can be engaged with the predetermined type of power tool by not interfering with the predetermined type of power tool, and The attachment-side engaging portion is configured to be unable to engage with a power tool of a different type when it interferes with the power tool of the predetermined type. attachment.

8. The attachment further includes a cylindrical housing that accommodates the attachment side engaging portion, the housing has an end portion that is located on the predetermined type of power tool side in the predetermined direction when the attachment is attached to the predetermined type of power tool, The protrusion protrudes from the end toward the outside of the housing.

8. An attachment according to claim 7.

9. The protrusion is provided around the entire periphery of the end portion.

9. The attachment according to claim 8.

10. The attachment further includes a cylindrical housing that accommodates the attachment side engaging portion, the housing has an end portion that is located on the predetermined type of power tool side in the predetermined direction when the attachment is attached to the predetermined type of power tool, The protruding portion protrudes from the end portion along the predetermined direction toward the predetermined type of power tool.

8. An attachment according to claim 7.

11. The protrusion is provided around the entire periphery of the end portion.

11. The attachment of claim 10.

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