tool

Abstract

The tool comprises: a first accessory; a second accessory; a first mounting portion configured to detachably mount the first accessory; a second mounting portion configured to detachably mount the second accessory; a first intermediate component configured to be displaced from a first non-mounting position to a first mounting position by mounting the first accessory to the first mounting portion; a second intermediate component configured to be displaced from a second non-mounting position to a second mounting position by mounting the second accessory to the second mounting portion; and a sensor configured to detect a specific state in which the first intermediate component is located in the first mounting position and the second intermediate component is located in the second mounting position.

Description

Technical Field

[0001] The present invention relates to a tool, which is configured to be capable of detachably mounting two accessories. Background Art

[0002] Tools with a prime mover sometimes have various attachments detachably mounted. For example, grinders with a rotationally driven top tool may have a cover (also called a wheel cover, disc cover, blade housing, etc.) that covers a portion of the top tool and a side handle that the user holds with one hand while holding the grinder handle with the other hand.

[0003] In such grinders, it is desirable to prevent the grinder from being used without accessories installed. For example, Patent Document 1 below discloses a grinder having a sensor that detects whether a cover is installed and a controller that prohibits rotation of the tool tip when the cover is not installed. Furthermore, Patent Document 2 below discloses a grinder having a sensor that detects whether a cover is installed and a sensor that detects whether a side handle is installed.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2017 / 051893

[0007] Patent Document 2: U.S. Patent Application Publication No. 2018 / 272494 Summary of the Invention

[0008] However, the technology described in Patent Document 2 prohibits rotation of the tool tip unless both the cover and the side handle are installed. This requires separate sensors for the cover and the side handle, increasing costs. This problem applies not only to grinders but also to any tool capable of detachably attaching two attachments. Therefore, it is desirable to have a single sensor within the tool detect the attachment of two attachments.

[0009] This specification discloses a tool. The tool may include: a first accessory; a second accessory; a first mounting portion configured to detachably mount the first accessory; a second mounting portion configured to detachably mount the second accessory; a first intermediate member configured to be displaced from a first non-mounted position to a first mounted position by mounting the first accessory to the first mounting portion; a second intermediate member configured to be displaced from a second non-mounted position to a second mounted position by mounting the second accessory to the second mounting portion; and a sensor configured to detect a specific state in which the first intermediate member is in the first mounted position and the second intermediate member is in the second mounted position.

[0010] According to this tool, a single sensor detects that the first intermediate member is in the first mounting position and the second intermediate member is in the second mounting position. The first intermediate member being in the first mounting position indicates that the first accessory is mounted, and the second intermediate member being in the second mounting position indicates that the second accessory is mounted. Therefore, a single sensor can detect that two accessories are mounted. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a longitudinal sectional view of the grinder according to the first embodiment of the present invention, showing a state where a side handle and a wheel cover are attached.

[0012] Figure 2 This is a longitudinal sectional view of the grinder, showing the state where the side handle and wheel cover are removed.

[0013] Figure 3 yes Figure 1 An enlarged view of a portion of the grinding machine is shown.

[0014] Figure 4 yes Figure 2 An enlarged view of a portion of the grinding machine is shown.

[0015] Figure 5 This is a perspective view of the first intermediate member.

[0016] Figure 6 It is a perspective view of the second intermediate member.

[0017] Figure 7 It is a perspective view of a holding member that holds the first intermediate member and the second intermediate member.

[0018] Figure 8 It is a three-dimensional diagram of the sensor fixing parts.

[0019] Figure 9 This figure shows the internal structure of the grinder, showing a state where the side handle and wheel cover are removed.

[0020] Figure 10 This figure shows the internal structure of the grinder, showing a state where the side handle is installed and the wheel cover is removed.

[0021] Figure 11 This figure shows the internal structure of the grinder, showing a state where the side handle and wheel cover are installed.

[0022] Figure 12 It is a schematic diagram showing the positional relationship among the sensor, the first intermediate member 60, and the second intermediate member 70 in a state where the side handle and the wheel house are removed.

[0023] Figure 13Schematic diagram showing the positional relationship among the sensor, the first intermediate member 60, and the second intermediate member 70 in a state where the side handle is attached and the wheel house is removed.

[0024] Figure 14 Schematic diagram showing the positional relationship among the sensor, the first intermediate member 60, and the second intermediate member 70 in a state where the side handle and the wheel house are attached.

[0025] Figure 15 It is a partial longitudinal sectional view of a grinder according to a second embodiment of the present invention, showing a state in which a side handle and a wheel cover are attached.

[0026] Figure 16 It is a longitudinal sectional view of the grinder according to the second embodiment, showing a state in which the side handle and the wheel cover are removed. DETAILED DESCRIPTION

[0027] In one or more embodiments, the tool may have: a first accessory; a second accessory; a first mounting portion, which is configured to mount the first accessory in a detachable manner; a second mounting portion, which is configured to mount the second accessory in a detachable manner; a first intermediate component, which is configured to be displaced from a first non-mounting position to a first mounting position by mounting the first accessory to the first mounting portion; a second intermediate component, which is configured to be displaced from a second non-mounting position to a second mounting position by mounting the second accessory to the second mounting portion; and a sensor, which is configured to detect a specific state in which the first intermediate component is located in the first mounting position and the second intermediate component is located in the second mounting position.

[0028] According to this tool, a single sensor detects that the first intermediate member is in the first mounting position and the second intermediate member is in the second mounting position. The first intermediate member being in the first mounting position indicates that the first accessory is mounted, and the second intermediate member being in the second mounting position indicates that the second accessory is mounted. Therefore, a single sensor can detect that two accessories are mounted.

[0029] In one or more embodiments, one sensor may be a photoelectric sensor or an ultrasonic sensor having a light-emitting portion and a light-receiving portion. The first intermediate member may be configured to shift between a position where it blocks light emitted from the light-emitting portion or ultrasonic waves emitted from the ultrasonic sensor, and a position where it does not block light or ultrasonic waves, depending on whether the first accessory is attached to the first mounting portion. The second intermediate member may be configured to shift between a position where it blocks light or ultrasonic waves, and a position where it does not block light or ultrasonic waves, depending on whether the second accessory is attached to the second mounting portion. This configuration allows for easy detection of the attachment of two accessories using a single photoelectric sensor or ultrasonic sensor.

[0030] In one or more embodiments, one sensor may be a reflective optical sensor. In one or more embodiments, one sensor may be a transmissive optical sensor.

[0031] In one or more embodiments, the tool may include an electric motor and a controller configured to control driving of the electric motor. The controller may enable driving of the electric motor when a sensor detects a specific state, and disable driving of the electric motor when a sensor does not detect the specific state.

[0032] In one or more embodiments, the tool may be a grinder having a tip tool configured to be rotated by an electric motor. The first accessory may be a side handle, and the second accessory may be a cover that partially covers the tip tool.

[0033] In one or more embodiments, the first mounting portion may include at least two side handle mounting portions, each of which is used to selectively mount a side handle. The first intermediate component may also be a single component, configured to be shared by the at least two side handle mounting portions and rotatable about the rotation axis of the electric motor. The at least two side handle mounting portions may also be located at positions separated from each other in the circumferential direction of the rotation axis. The first intermediate component may also have at least one pressed portion, and when the side handle is mounted on one of the at least two side handle mounting portions, the at least one pressed portion is directly or indirectly pressed by the side handle, and when the at least one pressed portion is pressed, the first intermediate component rotates about the rotation axis. According to this structure, even if a side handle is mounted on any one of the at least two side handle mounting portions, this can be detected. Furthermore, since the at least two side handle mounting portions share the single first intermediate component, the number of parts can be reduced.

[0034] In one or more embodiments, the first intermediate member may have a ring shape or a ring portion shape centered on the rotation axis. With this configuration, the first intermediate member has a shape corresponding to the arrangement of the at least two side handle mounting portions. Therefore, with a simple structure, a single first intermediate member can be shared by the at least two side handle mounting portions.

[0035] In one or more embodiments, at least one pressed portion may protrude radially outward from the first intermediate member body, or may be provided at at least two locations corresponding to the positions of at least two side handle mounting portions. This configuration facilitates rotation of the first intermediate member.

[0036] In one or more embodiments, at least one pressed portion may have a pressed surface that forms an angle with respect to the longitudinal direction of the side handle when the side handle is mounted on one of the side handle mounting portions, so as to displace the first intermediate member in a direction different from the longitudinal direction. This structure facilitates the rotation of the first intermediate member.

[0037] In one or more embodiments, the first intermediate member body may include a first through-hole having an arc shape centered on the rotation axis. The first intermediate member body may also be screwed through the first through-hole so as to be rotatable along the arc shape. This configuration allows the first intermediate member to be rotatably held with a simple structure.

[0038] In one or more embodiments, the first intermediate member may have a second through hole. Alternatively, when the first intermediate member is positioned so as not to block light or ultrasound waves, light or ultrasound waves may pass through the second through hole. This configuration allows the first intermediate member to be compact.

[0039] In one or more embodiments, the second intermediate member may be configured to be directly or indirectly pressed by the cover when the cover is mounted on the second mounting portion, causing linear motion. With this configuration, if the cover mounting direction corresponds to the linear motion direction of the second intermediate member, a direction conversion mechanism is unnecessary, thereby enabling displacement of the second intermediate member using a simple structure.

[0040] In one or more embodiments, the second intermediate member may include a third through-hole in the form of an elongated hole, with the length of the third through-hole oriented in the direction of linear motion of the second intermediate member. The second intermediate member may also be screwed through the third through-hole so as to allow linear motion along the elongated hole. This configuration allows the second intermediate member to be held linearly movable using a simple structure.

[0041] In one or more embodiments, the tool may include a single retaining member that holds the first and second intermediate members. With this configuration, once the first and second intermediate members are attached to the retaining members, the relative positions of the first and second intermediate members are automatically determined. In other words, there is no need to adjust the relative positions of the first and second intermediate members during tool assembly.

[0042] Hereinafter, the embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Figures 1 to 14 A first embodiment of the present invention will be described. In the following embodiments, a handheld electric disc grinder (hereinafter, also simply referred to as a grinder) 10 is exemplified as a tool.

[0043] like Figure 1 and Figure 2 As shown, the grinder 10 is configured to rotate a generally disc-shaped tip tool 28 mounted on a spindle 25. The spindle 25 is rotated by a rotational driving force provided by an electric motor 31 serving as a prime mover. A variety of tip tools 28 that can be mounted on the grinder 10 include grinding wheels, rubber pads, brushes, and blades. The user selects an appropriate tip tool 28 according to the desired processing operation and mounts it on the grinder 10. The grinder 10 can perform processing operations such as grinding, lapping, and cutting on a workpiece, depending on the type of tip tool 28.

[0044] In the following description, the direction in which the rotation axis AX1 of the electric motor 31 (in other words, the motor shaft 32) extends is defined as the front-to-back direction of the grinder 10. The side in the front-to-back direction where the top tool 28 is located is defined as the front side, and the opposite side is defined as the rear side. Furthermore, the direction in which the rotation axis AX2 of the spindle 25 (in other words, the rotation axis of the top tool 28) extends is defined as the up-down direction of the grinder 10. The side in the up-down direction where the top tool 28 is located is defined as the lower side, and the opposite side is defined as the upper side. Furthermore, the direction orthogonal to the up-down direction and the front-to-back direction is defined as the left-to-right direction of the grinder 10. In the left-to-right direction, the right side when viewing the front side from the rear side is defined as the right side of the grinder 10, and the opposite side is defined as the left side of the grinder 10.

[0045] like Figure 1 and Figure 2 As shown, the grinder 10 includes a gear housing 20, a motor housing 30, and a handle housing 40. An electric motor 31 is housed in the motor housing 30, which is located between the gear housing 20 and the handle housing 40 in the front-to-back direction, that is, in the longitudinal direction of the grinder 10. The electric motor 31 is configured to be driven by externally supplied power (in this embodiment, AC power supplied from an AC power supply, but DC power supplied from a battery may also be used). In addition, a controller 33 is housed in the handle housing 40, between the electric motor 31 and the switch 41 in the front-to-back direction. The controller 33 receives the power supplied from the outside and supplies the power to the electric motor 31 and the sensor 80 described later. The controller 33 controls the driving of the electric motor 31 by controlling the power supplied to the electric motor 31.

[0046] A mechanism for transmitting the rotational driving force of the electric motor 31 to the top tool 28 is housed in the gear housing 20. Specifically, a small bevel gear 23, a large bevel gear 24 and a main shaft 25 are housed in the gear housing 20. The small bevel gear 23 is fixed around the motor shaft 32 at the front end portion of the motor shaft 32 of the electric motor 31. The main shaft 25 is supported in a manner capable of rotating around the rotation axis AX2 by bearings that are separated in the up and down directions. The rotation axis AX2 intersects (more specifically, is orthogonal to) the rotation axis AX1 of the electric motor 31. The large bevel gear 24 is fixed around the main shaft 25 on the upper side of the main shaft 25 and meshes with the small bevel gear 23. A second mounting portion 22 for detachably mounting the cover 300 is provided at the lower end portion of the gear housing 20. The second mounting portion 22 has a cylindrical shape extending in the up and down directions. The main shaft 25 extends in the vertical direction within the gear housing 20 and extends from the gear housing 20 (more specifically, the second mounting portion 22 ) at the lower side.

[0047] An inner flange 26 is attached to the lower end of a spindle 25 extending from the gear housing 20. An externally threaded portion is formed on the spindle 25 below the inner flange 26, and a lock nut 27 is attached to this externally threaded portion. A tip tool 28 is clamped between the inner flange 26 and the lock nut 27, and the position of the tip tool 28 relative to the spindle 25 is fixed by tightening the lock nut 27.

[0048] The handle housing 40 is a portion that the user holds with one hand when using the grinder 10. The handle housing 40 has a cylindrical shape that extends approximately in the front-to-back direction. A switch 41 for driving the electric motor 31 is housed inside the handle housing 40. An operating member 50 is provided on the lower side of the handle housing 40. The operating member 50 is configured to be movable between an off position for turning the switch 41 off and an on position for turning the switch 41 on. Figure 1 、 Figure 2 , the operating member 50 is shown in the OFF position. A locking switch 57 is provided near the front end of the operating member 50 in the front-rear direction. The locking switch 57 is used to lock the operating member 50 in the OFF position and prevent it from moving to the ON position.

[0049] When the user operates the operating member 50 from the off position to the on position, the switch 41 detects this operation and transmits a detection signal to the controller 33. Upon receiving this detection signal, the controller 33 supplies power to the electric motor 31, driving the electric motor 31. When the electric motor 31 is driven, the rotation of the motor shaft 32 is transmitted to the spindle 25 while being decelerated by the small bevel gear 23 and the large bevel gear 24. At this time, the direction of the rotational motion also changes from the direction around the motor shaft 32 to the direction around the rotation axis AX2 of the spindle 25. Due to this mechanism, the spindle 25 rotates about the rotation axis AX2 as the motor shaft 32 rotates. As a result, the tip tool 28, which is secured by the inner flange 26 and the lock nut 27, rotates along with the spindle 25.

[0050] like Figure 1 As shown, the grinder 10 also includes a side handle 200 and a cover 300 as accessories. The side handle 200 is provided for the user to hold with a hand other than the hand holding the handle housing 40. By using the side handle 200, the user can hold the grinder 10 more stably. The side handle 200 includes a grip portion 210 for the user to grip and a mounting portion 220 for mounting to the gear housing 20. The mounting portion 220 has a cylindrical shape extending along the length of the side handle 200 and extends from one end of the grip portion 210 in the lengthwise direction of the side handle 200. External threads are formed on the outer circumferential surface of the mounting portion 220.

[0051] like Figure 9 As shown, the gear housing 20 has three first mounting portions 29a to 29c for detachably mounting the side handle 200. The first mounting portions 29a to 29c are arranged at positions separated from each other in the circumferential direction around the rotation axis AX1. More specifically, the first mounting portion 29a is formed on the left side of the gear housing 20, the first mounting portion 29b is formed on the upper surface of the gear housing 20, and the first mounting portion 29c is formed on the right side of the gear housing 20. The three first mounting portions 29a to 29c are respectively arranged at positions that are rotationally symmetrical with respect to the rotation axis AX1. The first mounting portions 29a to 29c are respectively in the form of through holes that connect the inside and outside of the gear housing 20. An internal thread that screws into the external thread of the mounting portion 220 is formed on the inner surface forming the through hole.

[0052] The side handle 200 can be attached to the gear housing 20 by screwing the mounting portion 220 of the side handle 200 into one of the three first mounting portions 29a to 29c. The user can select any mounting location of the side handle 200 from among the first mounting portions 29a to 29c, depending on the type of work performed using the grinder 10 or whether they are right-handed or left-handed. In this embodiment, three first mounting portions 29a to 29c are provided, but the number of first mounting portions is not particularly limited and can be any number, one or more. For example, only two first mounting portions 29a and 29c may be provided.

[0053] like Figure 1 As shown, the cover 300 includes a cover body 310 that covers a portion of the tip tool 28 and a mounting portion 320 for mounting on the second mounting portion 22. The cover body 310 covers approximately half of the rear side of the tip tool 28. In this embodiment, the cover body 310 covers the upper and lower surfaces of the tip tool 28, as well as the circumferential surface between the upper and lower surfaces. However, depending on the type of tip tool 28 used, it is also possible to cover only the upper and circumferential surfaces. The mounting portion 320 has an open, generally annular shape, extending upward from the upper surface of the cover body 310. The structure of the mounting portion 320 is well known and therefore omitted from illustration. The mounting portion 320 has two opposing flanges at its two circumferential ends. With the mounting portion 320 positioned so as to surround the second mounting portion 22 of the gear housing 20, bolts are inserted into the threaded holes formed in the flanges and tightened, thereby reducing the radius of the annular shape of the mounting portion 320 and attaching it to the second mounting portion 22.

[0054] The above-described grinder 10 can only drive the electric motor 31 when the side handle 200 is attached to any one of the first mounting portions 29a-29c of the gear housing 20 and the cover 300 is attached to the second mounting portion 22 of the gear housing 20. When at least one of the side handle 200 and the cover 300 is not attached, even if the user operates the operating member 50 to the on position and a detection signal is sent from the switch 41 to the controller 33, the controller 33 prohibits driving the electric motor 31. The state in which both the side handle 200 and the cover 300 are attached is detected by a single sensor 80, described later, and the signal is output from the sensor 80 to the controller 33 via a signal line (not shown). The structure for performing this detection will be described in detail below with reference to the accompanying drawings.

[0055] like Figure 1 and Figure 2 As shown, the grinding machine 10 further includes a first intermediate member 60, a second intermediate member 70, a holding member 140, and a sensor 80. First, the first intermediate member 60, the second intermediate member 70, the holding member 140, and the sensor 80 will be described in outline.

[0056] The first intermediate member 60 is configured so that, by mounting the side handle 200 on any one of the first mounting portions 29a to 29c, the first intermediate member 60 is pressed by the mounting portion 220 of the side handle 200, thereby causing displacement. In the present embodiment, as such displacement action, the first intermediate member 60 rotates by a predetermined angle around the rotation axis AX1. The position of the first intermediate member 60 when the side handle 200 is not mounted on any one of the first mounting portions 29a to 29c of the gear housing 20 is also referred to as a first non-mounting position (see Figure 4 、 9 The position of the first intermediate member 60 when the side handle 200 is mounted on any one of the first mounting portions 29a to 29c is also referred to as a first mounting position (see Figure 3 、 Figure 10 、 Figure 11 The first intermediate member 60 is a substantially annular member, and is disposed inside the gear housing 20 at a position forward of the electric motor 31 so as to surround the motor shaft 32 .

[0057] The second intermediate member 70 is configured so that, by mounting the cover 300 on the second mounting portion 22, it is pressed by the mounting portion 320 of the cover 300, thereby causing displacement. In this embodiment, as this displacement action, the second intermediate member 70 performs a linear motion upward. The position of the second intermediate member 70 when the cover 300 is not mounted on the second mounting portion 22 of the gear housing 20 is also referred to as the second non-mounting position (see Figure 4 、 Figure 9 、 Figure 10 The position of the second intermediate member 70 when the cover 300 is mounted on the second mounting portion 22 is also referred to as a second mounting position (see Figure 5 、 Figure 16 The second intermediate member 70 is disposed between the motor shaft 32 and the distal end tool 28 at a position forward of the first intermediate member 60 .

[0058] The holding member 140 is arranged in front of the first intermediate member 60 and holds the first intermediate member 60 and the second intermediate member 70 together.

[0059] The sensor 80 detects a state in which the first intermediate member 60 is located at the first mounting position and the second intermediate member 70 is located at the second mounting position. In this embodiment, the sensor 80 is a photoelectric sensor.

[0060] Next, the first intermediate member 60, the second intermediate member 70, the holding member 140, and the sensor 80 will be described in detail. First, the first intermediate member 60 will be described. Figure 5As shown, the first intermediate component 60 is a single component, commonly provided with respect to the first mounting portions 29a to 29c. The first intermediate component 60 includes a first intermediate component body 61. In this embodiment, the first intermediate component body 61 has a ring shape centered on the rotation axis AX1 of the electric motor 31. However, the first intermediate component 60 may also have a shape that is a portion of a ring (in other words, a shape that is not a closed ring). A through-hole is formed in the center of the first intermediate component body 61, through which the motor shaft 32 passes.

[0061] The first intermediate component 60 also has three pressed portions 62a to 62c and a second through hole 64. The three pressed portions 62a to 62c are arranged to be separated from each other in the circumferential direction. The pressed portion 62a is a portion that is pressed by the side handle 200 (more specifically, the top end of the mounting portion 220) when the side handle 200 is mounted on the first mounting portion 29a of the gear housing 20. Similarly, the pressed portion 62b is a portion that is pressed by the side handle 200 when the side handle 200 is mounted on the first mounting portion 29b, and the pressed portion 62c is a portion that is pressed by the side handle 200 when the side handle 200 is mounted on the first mounting portion 29c. Therefore, the pressed portions 62a to 62c are respectively arranged at angular positions corresponding to the angular positions of the first mounting portions 29a to 29c (refer to Figure 14 The pressed portions 62 a to 62 c respectively project radially outward from the first intermediate member body 61 .

[0062] As described above, the first intermediate member 60 is configured to rotate about the rotation axis AX1 when any one of the pressed portions 62a to 62c is pressed by the side handle 200. Figure 9 and Figure 10 By comparison, it can be seen that the side handle 200 is mounted on the first mounting portion 29c, the pressed portion 62c is pressed by the side handle 200, and the first intermediate member 60 is moved from Figure 9 Rotate counterclockwise to the position shown Figure 10 Position shown.

[0063] like Figure 5 and Figure 9As shown, the pressed portion 62a has a pressed surface 63a, and the pressed surface 63a forms an angle with respect to the longitudinal direction of the side handle 200 when the side handle 200 is installed on the first mounting portion 29a (in other words, the mounting direction of the side handle 200). Similarly, the pressed portion 62b has a pressed surface 63b, and the pressed surface 63b forms an angle with respect to the longitudinal direction of the side handle 200 when the side handle 200 is installed on the first mounting portion 29b. Similarly, the pressed portion 62c has a pressed surface 63c, and the pressed surface 63c forms an angle with respect to the longitudinal direction of the side handle 200 when the side handle 200 is installed on the first mounting portion 29c. The pressed surfaces 63a to 63c form an angle of approximately 45 degrees with respect to the longitudinal direction of the corresponding side handle 200 (see Figure 9 This angle can be set to any desired angle to displace the first intermediate member 60 in a direction different from the longitudinal direction of the side handle 200. Alternatively, this angle can be set within a range of 30 degrees to 60 degrees. The angled pressed surfaces 63a to 63c facilitate rotation of the first intermediate member 60.

[0064] The second through hole 64 penetrates the first intermediate member 60 in the front-to-back direction. Figure 9 In the first non-mounted position shown, the second through hole 64 is located at an angular position slightly to the left and slightly upwardly offset from the lowermost portion of the first intermediate member 60 (in other words, a position not overlapping with the shielding portion 73 of the second intermediate member 70 described later when viewed from the front-back direction). Figure 10 In the first mounting position shown, the second through hole 64 is located at the lowest angular position of the first intermediate member 60 (in other words, a position overlapping with a shielding portion 73 of the second intermediate member 70 described later when viewed from the front-back direction).

[0065] like Figure 5 As shown, the first intermediate member body 61 has first through holes 65 and 66. The first through holes 65 and 66 each have an arc shape centered on the rotation axis AX1. The first through holes 65 and 66 are arranged at positions that are 180 degrees rotationally symmetrical with respect to the rotation axis AX1. The first intermediate member 60 is screwed to the holding member 140 through the first through holes 65 and 66. Specifically, as shown in FIG. Figures 9-11 As shown, bolts 91 are inserted into the first through holes 65 and 66. The bolts 91 are screwed into the threaded holes 143a and 144a of the holding member 140 described later. In addition, the sensor substrate holding member 85 described later is actually arranged between the first intermediate member 60 and the head of the bolt 91 (see FIG. Figure 8 ), the bolt 91 is arranged through the through holes 87, 88 and the first through holes 65, 66 of the sensor substrate holding member 85, but Figures 9-11Illustration is omitted. By maintaining a predetermined gap between the holding member 140 and / or the sensor substrate holding member 85 and the first intermediate member 60, the first intermediate member 60 is held by the holding member 140 so as to be rotatable along the arcuate shape of the first through-holes 65 and 66. This configuration allows the first intermediate member 60 to be held with a simple structure.

[0066] The first intermediate member 60 further includes a protrusion 67. The protrusion 67 extends forward from the front surface of the first intermediate member body 61. The protrusion 67 is used to rotate the spring 68 (see Figure 7 ) The first intermediate member 60 is moved to the first non-installation position (refer to Figure 4 、 Figure 9 )Apply force.

[0067] Next, the second intermediate member 70 will be described. Figure 6 As shown, the second intermediate component 70 includes a base 71, a pressed portion 72, a shielding portion 73, supporting portions 74 and 75, and a spring seat 78. The base 71 is a flat plate-shaped portion perpendicular to the vertical direction, with the longitudinal direction being the front-to-back direction. The pressed portion 72 is a portion that is pressed upward by the mounting portion 320 of the cover 300 when the cover 300 is mounted on the second mounting portion 22, and is located at the front end of the second intermediate component 70. The pressed portion 72 has a flat plate-shaped shape parallel to the base 71. A step portion is formed between the base 71 and the pressed portion 72. This step portion can reduce the displacement of the second intermediate component 70 when the cover 300 is mounted. Specifically, when the cover 300 is installed, the second intermediate member 70 does not move from the moment the mounting portion 320 of the cover 300 is raised to the same position as the base 71 until the moment the mounting portion 320 abuts the pressed portion 72. Therefore, compared to a configuration in which the pressed portion 72 is located at the same vertical position as the base 71, the displacement of the second intermediate member 70 is reduced by an amount corresponding to the step. This reduces the displacement space of the second intermediate member 70. In other words, it is possible to suppress an increase in the vertical size of the grinding machine 10.

[0068] The shielding portion 73 is a portion that blocks light emitted from the sensor 80 when the second intermediate member 70 is mounted in the second mounting position. The shielding portion 73 is located at the rear end of the second intermediate member 70 and extends upward from the rear end of the base 71. The shielding portion 73 has a flat plate shape that is perpendicular to the front-rear direction.

[0069] The support parts 74 and 75 are configured to face each other in the left-right direction near the shielding part 73 at a position closer to the front side than the shielding part 73. The support parts 74 and 75 have a roughly L-shaped shape, extending from the base 71 in a direction away from each other in the left-right direction, then bending, and then extending upward. The support parts 74 and 75 are respectively formed with third through holes 76 and 77 that penetrate the support parts 74 and 75 in the front-to-back direction. The third through holes 76 and 77 are in the form of long holes with the up-down direction (i.e., the direction of linear motion when the cover 300 is pressed) as the length direction. The second intermediate component 70 is screwed to the retaining component 140 through the third through holes 76 and 77. Specifically, as Figures 9-11 As shown, bolts 92 are inserted into the third through holes 76 and 77. These bolts 92 are screwed into threaded holes 145a and 146a of the retaining member 140, which will be described later. By ensuring a predetermined gap between the head of the bolt 92 and the support portions 74 and 75, respectively, the second intermediate member 70 is retained by the retaining member 140 so as to be linearly movable along the third through holes 76 and 77. This structure allows the second intermediate member 70 to be retained with a simple structure.

[0070] The spring seat 78 is provided in a manner that it protrudes upward from the base 71. Figure 7 ) between the spring 79 (refer to Figure 4 The spring 79 pushes the second intermediate member 70 toward the second non-mounting position (see Figure 4 、 Figure 9 、 10 )Apply force.

[0071] Next, the holding member 140 will be described. Figure 7 As shown, the retaining member 140 includes an annular portion 141, a cylindrical portion 142, protrusions 143 and 144, protrusions 145 and 146, a spring seat 148, and a spring receiving portion 149. The annular portion 141 has a disk shape centered on the rotation axis AX1 of the electric motor 31, and has a through-hole formed at its center. A notch 147 is formed on the underside of the annular portion 141 to ensure displacement space for the second intermediate member 70.

[0072] The cylindrical portion 142 has a cylindrical shape extending rearward from the annular portion 141. The diameter of the cylindrical portion 142 is smaller than that of the annular portion 141. A spring receiving portion 149 is formed on the upper side of the cylindrical portion 142, adjacent to the cylindrical portion 142. The spring receiving portion 149 is formed in an arc shape centered on the rotation axis AX1. The spring receiving portion 149 houses a spring 68 that can be extended and retracted along the arc shape of the spring receiving portion 149. The rear side of the spring receiving portion 149 is open, through which the protrusion 67 of the first intermediate component 60 is inserted into the spring receiving portion 149. One end of the spring 68 is supported by the inner surface of the spring receiving portion 149 (the plane located at one end of the arc shape), and the other end of the spring 68 engages with the protrusion 67. As a result, the first intermediate component 60 is urged in the clockwise direction (in other words, toward the first non-mounted position).

[0073] The protrusions 143 and 144 are arranged to be separated from each other in the left-right direction. The protrusions 143 and 144 extend from the annular portion 141 to the rear side at approximately the center of the annular portion 141 in the up-down direction. The protrusions 143 and 144 have threaded holes 143a and 144a formed with internal threads, respectively. The threaded holes 143a and 144a extend from the rear end surfaces of the protrusions 143 and 144 to the front side. In order to mount the first intermediate component 60 to the retaining component 140 in the above-mentioned form, bolts 91 (see Figure 9 ).

[0074] The protrusions 145 and 146 are arranged below the protrusions 143 and 144 and are spaced apart from each other in the left-right direction. The protrusions 145 and 146 have screw holes 145a and 146a formed with internal threads, respectively. The screw holes 145a and 146a extend forward from the rear end surfaces of the protrusions 145 and 146. In order to attach the second intermediate member 70 to the holding member 140 in the above-mentioned manner, the bolts 92 (see FIG. 1 ) are screwed into the screw holes 145a and 146a. Figure 9 In order to hold the second intermediate member 70 at a position forward of the first intermediate member 60 , the lengths of the protrusions 145 and 146 in the front-rear direction are smaller than the lengths of the protrusions 143 and 144 in the front-rear direction.

[0075] The aforementioned spring seat 148 is formed at the lower end of the cylindrical portion 142. When the first intermediate member 60 and the second intermediate member 70 are attached, the retaining member 140 is inserted into the gear housing 20 so that the outer periphery of the annular portion 141 and the inner periphery of the cylindrical portion 142 abut against the gear housing 20. This secures the retaining member 140 to the gear housing 20. When the first and second intermediate members 60, 70 are attached to a single retaining member 140, the relative positions of the first and second intermediate members 60, 70 are naturally determined. Therefore, there is no need to adjust the relative positions of the first and second intermediate members 60, 70 when assembling the grinding machine 10. Furthermore, as described above, the retaining member 140 holds the sensor substrate retaining member 85, which holds the sensor 80, together with the first intermediate member 60. Therefore, when the sensor substrate retaining member 85 is attached, the relative position of the sensor 80 relative to the first and second intermediate members 60, 70 is naturally determined, eliminating the need to adjust the position of the sensor 80.

[0076] Next, the sensor 80 will be described. In this embodiment, the sensor 80 is a reflective optical sensor. Figure 4 As shown, the sensor 80 includes a light emitting portion 82, a light receiving portion 83, and a sensor substrate 81. The light emitting portion 82 and the light receiving portion 83 are mounted together on the sensor substrate 81. The light emitting portion 82 and the light receiving portion 83 are arranged on the front surface of the sensor substrate 81. The sensor 80 is positioned near the bottom of the gear housing 20 to detect displacement of the first intermediate member 60 and the second intermediate member 70. More specifically, the sensor substrate 81 and the light emitting portion 82 are positioned on the rear side of the first intermediate member body 61, close to the first intermediate member body 61.

[0077] The sensor 80 is composed of Figure 8 The sensor substrate 81 is held by the sensor substrate holding member 85 shown. The sensor substrate holding member 85 is a roughly Y-shaped plate-like member. The sensor substrate 81, which carries the light-emitting unit 82 and the light-receiving unit 83, is held at the bifurcated base of the sensor substrate holding member 85. The sensor substrate 81 is secured to the sensor substrate holding member 85 by any method (e.g., screw fastening, snap-fitting, or snap-fitting by localized heat deformation). Furthermore, through-holes 87 and 88 are formed near the bifurcated tips of the sensor substrate holding member 85.

[0078] The first intermediate member 6 is displaced between a position where it blocks light emitted from the light-emitting portion 82 and a position where it does not block the light due to the attachment of the side handle 200. Similarly, the second intermediate member 70 is displaced between a position where it blocks light emitted from the light-emitting portion 82 and a position where it does not block the light due to the attachment of the cover 300. The sensor 80 detects the attachment of the side handle 200 and the cover 300 based on whether the light receiving portion 83 receives light due to the positional difference between the first intermediate member 60 and the second intermediate member 70. This will be described in more detail below.

[0079] Figure 12 The first intermediate member 60 and the second intermediate member 70 are schematically shown when neither the side handle 200 nor the cover 300 is attached (see FIG. Figure 4 、 Figure 9 ) and the positional relationship of the sensor 80. In a state where the side handle 200 and the cover 300 are not installed, as shown in FIG. Figure 12 As shown, the first intermediate member 60 is located at a position where the first intermediate member body 61 blocks the light emitted from the light emitting portion 82. Since the first intermediate member body 61 is close to the light emitting portion 82 and the light receiving portion 83, the light receiving portion 83 cannot receive the light emitted from the light emitting portion 82. Even when only the cover 300 of the side handle 200 and the cover 300 is installed, the first intermediate member body 61 is located at a position where the light emitting portion 82 is blocked. Figure 12 Therefore, the light receiving portion 83 cannot receive the light emitted from the light emitting portion 82, but the illustration is omitted.

[0080] When the right Figure 12 In the state shown, when only the side handle 200 is installed, the first intermediate member 60 is displaced to Figure 3 、 Figure 10 The first installation position shown in the figure. Figure 13 As shown, light 89 emitted from the light emitting portion 82 passes through the second through hole 64 and is not blocked by the first intermediate member body 61. Furthermore, at this time, since the blocking portion 73 of the second intermediate member 70 is located at a position where it does not block the light 89, the light receiving portion 83 cannot receive the light emitted from the light emitting portion 82.

[0081] When the right Figure 13 When the cover 300 is installed in the state shown, the second intermediate member 70 is displaced to Figure 3 、 Figure 11 The second installation position is shown in the figure. Figure 14 As shown, light 89 emitted from the light emitting portion 82 passes through the second through hole 64 and is then blocked by the blocking portion 73. As a result, the light 89 is reflected by the blocking portion 73 and is received by the light receiving portion 83.

[0082] Thus, according to the above-described grinder 10, only when both the side handle 200 and the cover 300 are attached can the light 89 emitted by the light emitting portion 82 be received by the light receiving portion 83 of the single sensor 80. In other words, the attachment of both the side handle 200 and the cover 300 can be detected by the single sensor 80. Therefore, compared to a configuration in which separate sensors are provided for each of the side handle 200 and the cover 300, the number of components and costs can be reduced.

[0083] Furthermore, the first intermediate member 60 is configured to rotate about the rotation axis AX1 when any of the pressed portions 62a to 62c is pressed by the side handle 200. Therefore, there is no need to ensure displacement space for the first intermediate member 60 in the front-to-back direction, and the grinder 10 can be made compact in the front-to-back direction.

[0084] When the cover 300 is mounted, the second intermediate member 70 is pressed by the cover 300 (more specifically, the mounting portion 320) and linearly moves in the mounting direction (ie, upward) of the cover 300. Therefore, a direction conversion mechanism is unnecessary, and the device structure can be simplified.

[0085] Below, refer to Figure 15 、 16 The second embodiment of the present invention will be described. The second embodiment differs from the first embodiment in that a sensor 180 is used instead of the sensor 80, a first intermediate member 160 is used instead of the first intermediate member 60, and a second intermediate member 170 is used instead of the second intermediate member 70. Figure 15 、 Figure 16 In the embodiment, the same components as those of the first embodiment are marked with the same reference numerals as those of the first embodiment. Only the differences between the second embodiment and the first embodiment will be described below. In this embodiment, the sensor 180 is a transmissive optical sensor. Figure 15 、 Figure 16 As shown, sensor 180 includes a light-emitting portion 182, a light-receiving portion 183, and a sensor substrate 181. Both light-emitting portion 182 and light-receiving portion 183 are mounted on sensor substrate 181. First intermediate member 160 lacks second through-hole 64 and instead has a notch at its radially outer edge. Second intermediate member 170 lacks shielding portion 73 and instead has shielding portion 173. Shielding portion 173 extends downward from the rear end of base 71.

[0086] The light emitting portion 182 and the light receiving portion 183 are arranged such that the shielding portion 173 and the first intermediate member body 61 are located between the light emitting portion 182 and the light receiving portion 183 in the front-back direction. In this structure, when the first intermediate member 160 is located in the first non-mounted position, the first intermediate member body 61 is located in a position that shields the light emitted from the light emitting portion 182, and when the second intermediate member 170 is located in the first non-mounted position, the shielding portion 173 is located in a position that shields the light emitted from the light emitting portion 182 (see FIG. 1 ). Figure 16 ). That is, when at least one of the side handle 200 and the cover 300 is not installed, the light emitted from the light emitting portion 182 is blocked by at least one of the first intermediate component 160 and the second intermediate component 170. Therefore, the light receiving portion 183 cannot receive the light emitted from the light emitting portion 182. On the other hand, when the first intermediate component 160 is located at the first installation position, the light emitted from the light emitting portion 182 can pass through the gap of the first intermediate component 160, and when the second intermediate component 170 is located at the first installation position, the shielding portion 173 is displaced to a position where it does not block the light emitted from the light emitting portion 182 (refer to Figure 15 That is, when both the side handle 200 and the cover 300 are installed, the light emitted from the light emitting portion 182 is received by the light receiving portion 183. Therefore, the state in which both the side handle 200 and the cover 300 are installed can be detected by one sensor 180.

[0087] The embodiments of the present invention have been described above. The above embodiments are merely for the purpose of making the present invention easier to understand and do not limit the present invention. The present invention can be changed or improved within the scope of its main purpose, and its equivalents are also included in the present invention. In addition, within the scope of being able to solve at least part of the above-mentioned technical problems or within the scope of exerting at least part of its effects, the various elements described in the technical solutions and the description can be arbitrarily combined or omitted.

[0088] For example, the shapes and configurations of the components of the grinding machine 10 described above are merely illustrative and can be modified as desired, as long as the components ensure their proper function. For example, instead of protruding radially outward, the pressed portions 62a-62c of the first intermediate component 60 may protrude forward or backward. Alternatively, the first intermediate component 60 may include a shielding portion protruding radially outward from the first intermediate component body 61, instead of the second through-hole 64. In this case, when the first intermediate component 60 is in the first non-installed position, the shielding portion blocks light emitted from the light-emitting portion 82. When the first intermediate component 60 is in the first installed position, the shielding portion is displaced to a position where it does not block light emitted from the light-emitting portion 82.

[0089] Furthermore, when the side handle 200 is attached, the first intermediate member 60 may be indirectly pressed by the side handle 200. Specifically, an additional member that is displaced by the side handle 200 may be provided, and the additional member may be used to displace the first intermediate member 60. Similarly, when the cover 300 is attached, the second intermediate member 70 may be indirectly pressed by the cover 300.

[0090] Furthermore, instead of a configuration in which the first intermediate member 60 rotates when the side handle 200 is attached, the first intermediate member 60 may be configured so as to be tilted when the side handle 200 is attached, by being pressed by the side handle 200. For example, the first intermediate member 60 may include a support shaft on the lower side of the first intermediate member 60, and the first intermediate member 60 may be tilted with the lower end of the first intermediate member 60 approaching the front side around the support shaft.

[0091] Furthermore, the second intermediate member 70 may be positioned so as to block light emitted from the light emitting portion 82 in the second non-mounted position, and so as not to block light emitted from the light emitting portion 82 in the second mounted position. In this case, for example, the second intermediate member 70 may be coated with a low-reflectivity coating, and a reflective plate may be positioned so that the first intermediate member 60 and the second intermediate member 70 are positioned between the reflective plate and the sensor 80 in the front-to-back direction. In this manner, the light receiving portion 83 can receive light emitted from the light emitting portion 82 only when both the side handle 200 and the cover 300 are mounted.

[0092] Sensors 80 and 180 are not limited to photoelectric sensors and may also be other known sensor types. For example, an ultrasonic distance sensor may also be used. In this case, if the first intermediate member 60 and the second intermediate member 70 are configured to shift between a position that blocks the ultrasonic waves emitted by the sensors (hereinafter referred to as the blocking position) and a position that does not block the ultrasonic waves (hereinafter referred to as the non-blocking position), depending on whether the side handle 200 or the cover 300 is installed, the state of both the side handle 200 and the cover 300 can be detected. For example, the first intermediate member 60 may be in the blocking position when the side handle 200 is not installed and in the non-blocking position when the side handle 200 is installed. Alternatively, the second intermediate member 70 may be in the blocking position when the cover 300 is not installed and in the non-blocking position when the cover 300 is installed. In this way, the state of both the side handle 200 and the cover 300 can be detected based on the difference in detected distances. Alternatively, an eddy current displacement sensor may be used. In this case, at least a portion of each of the first intermediate member 60 and the second intermediate member 70 is formed of metal. Alternatively, a color sensor may be used. In this case, the first intermediate member 60 and the second intermediate member 70 are colored in different colors.

[0093] Furthermore, instead of or in addition to the configuration that enables or disables the operation of the electric motor 31 based on the installed state of the side handle 200 and the cover 300, the grinder 10 may include a notification unit for notifying the user that at least one of the side handle 200 and the cover 300 is not installed. This notification may be achieved through light emission, sound emission, text display, or a combination of these. For example, the notification unit may include at least one of a light-emitting element such as an LED, a GUI screen, or a speaker.

[0094] Furthermore, the above-described embodiment is not limited to the grinder 10 , and can be applied to any tool to which two attachments can be detachably mounted.

[0095] Description of Reference Numerals

[0096] 10: Grinder; 20: Gear housing; 22: Second mounting portion; 23: Small bevel gear; 24: Large bevel gear; 25: Spindle; 26: Inner flange; 27: Lock nut; 28: Top tool; 29a-29c: First mounting portion; 30: Motor housing; 31: Electric motor; 32: Motor shaft; 33: Controller; 40: Handle housing; 41: Switch; 50: Operating member; 60, 160: First intermediate member; 61: First intermediate member body; 62a-62c: Pressed portion; 63a-63c: Pressed surface; 64: Second through hole; 65: First through hole; 67: Protrusion; 68: Spring; 70, 170: Second intermediate member; 71: Base; 72: Pressed portion; 73, 173: Shielding portion; 74: Support portion; 76: Third through hole; 78: Spring seat; 79: Spring; 80, 180: Sensor; 81, 181: Sensor substrate; 82, 182: Light-emitting portion; 83, 183: Light-receiving portion; 85: Sensor substrate holding component; 87, 88: Through hole; 89: Light; 91, 92: Bolt; 140: Holding component; 141: Annular portion; 142: Cylindrical portion; 143, 144, 145, 146: Protrusions; 143a, 144a, 145a, 146a: Threaded hole; 147: Notch; 148: Spring seat; 149: Spring receiving portion; 200: Side handle; 210: Handle portion; 220: Mounting portion; 300: Cover; 310: Cover body; 320: Mounting portion; AX1, AX2: Rotation axis.

Claims

1. A tool, characterized in that have: Annex 1; Annex 2; a first mounting portion configured to detachably mount the first accessory; a second mounting portion configured to detachably mount the second accessory; a first intermediate member configured to be displaced from a first non-mounted position to a first mounted position by mounting the first accessory on the first mounting portion; a second intermediate member configured to be displaced from a second non-mounting position to a second mounting position by mounting the second accessory on the second mounting portion; and a sensor configured to detect a specific state in which the first intermediate member is located at the first mounting position and the second intermediate member is located at the second mounting position.

2. The tool according to claim 1, characterized in that The one sensor is a photoelectric sensor having a light emitting portion and a light receiving portion, or an ultrasonic sensor, The first intermediate member is configured to shift between a position where the light emitted from the light emitting portion or the ultrasonic wave emitted from the ultrasonic sensor is blocked and a position where the light or the ultrasonic wave is not blocked, depending on whether the first accessory is mounted on the first mounting portion. The second intermediate member is configured to be displaced between a position where the light or the ultrasonic wave is blocked and a position where the light or the ultrasonic wave is not blocked, depending on whether the second attachment is mounted on the second mounting portion.

3. The tool according to claim 2, characterized in that The one sensor is a reflective optical sensor.

4. The tool according to claim 2, characterized in that The one sensor is a transmissive optical sensor.

5. The tool according to any one of claims 1 to 4, characterized in that Having: an electric motor; and a controller that controls driving of the electric motor, The controller allows driving of the electric motor when the one sensor detects the specific state, and prohibits driving of the electric motor when the one sensor does not detect the specific state.

6. The tool according to claim 5, characterized in that The tool is a grinder having a tip tool configured to be rotated by the electric motor. The first accessory is a side handle. The second accessory is a cover that partially covers the tip tool.

7. The tool according to claim 6, characterized in that The first mounting portion includes at least two side handle mounting portions, and the at least two side handle mounting portions are used to selectively mount the side handle. The first intermediate member is a single member, which is provided in common with the at least two side handle mounting portions and is rotatable about the rotation axis of the electric motor. The at least two side handle mounting portions are respectively located at positions separated from each other in the circumferential direction of the rotation axis. The first intermediate component has at least one pressed portion. When the side handle is installed on one side handle mounting portion selected arbitrarily from the at least two side handle mounting portions, the pressed portion is directly or indirectly pressed by the side handle. When the pressed portion is pressed, the first intermediate component rotates around the rotation axis.

8. The tool according to claim 7, characterized in that The first intermediate member includes a first intermediate member main body having a ring shape or a shape of a portion of a ring centered on the rotation axis.

9. The tool according to claim 8, characterized in that The at least one pressed portion protrudes radially outward from the first intermediate member body and is provided at at least two positions corresponding to positions of the at least two side handle mounting portions.

10. The tool according to any one of claims 1 to 4, characterized in that Having: an electric motor; and a controller configured to control driving of the electric motor, The controller allows the electric motor to be driven when the one sensor detects the specific state, and prohibits the electric motor from being driven when the one sensor does not detect the specific state. The tool is a grinder having a tip tool configured to be rotated by the electric motor. The first accessory is a side handle. The second accessory is a cover that partially covers the top tool. The first mounting portion includes at least two side handle mounting portions, and the at least two side handle mounting portions are used to selectively mount the side handle. The first intermediate member is a single member, which is provided in common with the at least two side handle mounting portions and is rotatable about the rotation axis of the electric motor. The at least two side handle mounting portions are respectively located at positions separated from each other in the circumferential direction of the rotation axis. The first intermediate member has at least one pressed portion, and when the side handle is mounted on one side handle mounting portion arbitrarily selected from the at least two side handle mounting portions, the pressed portion is directly or indirectly pressed by the side handle, and when the pressed portion is pressed, the first intermediate member rotates around the rotation axis. The at least one pressed portion has a pressed surface that forms an angle with respect to the longitudinal direction of the side handle when the side handle is mounted on the one side handle mounting portion so as to displace the first intermediate member in a direction different from the longitudinal direction.

11. The tool according to claim 8, characterized in that The first intermediate member body has a first through hole having an arc shape centered on the rotation axis. The first intermediate member body is screwed and fastened through the first through hole so as to be rotatable along the arc shape.

12. The tool according to any one of claims 2 to 4, characterized in that Having: an electric motor; and a controller configured to control driving of the electric motor, The controller allows the electric motor to be driven when the one sensor detects the specific state, and prohibits the electric motor from being driven when the one sensor does not detect the specific state. The tool is a grinder having a tip tool configured to be rotated by the electric motor. The first accessory is a side handle. The second accessory is a cover that partially covers the top tool. The first mounting portion includes at least two side handle mounting portions, and the at least two side handle mounting portions are used to selectively mount the side handle. The first intermediate member is a single member, which is provided in common with the at least two side handle mounting portions and is rotatable about the rotation axis of the electric motor. The at least two side handle mounting portions are respectively located at positions separated from each other in the circumferential direction of the rotation axis. The first intermediate member has at least one pressed portion, and when the side handle is mounted on one side handle mounting portion arbitrarily selected from the at least two side handle mounting portions, the pressed portion is directly or indirectly pressed by the side handle, and when the pressed portion is pressed, the first intermediate member rotates around the rotation axis. The first intermediate member has a second through hole, When the first intermediate member is located at a position where the light or the ultrasonic wave is not blocked, the light or the ultrasonic wave passes through the second through hole.

13. The tool according to claim 6, characterized in that The second intermediate member is configured to be directly or indirectly pressed by the cover and to move linearly when the cover is mounted on the second mounting portion.

14. The tool according to claim 13, characterized in that The second intermediate member has a third through hole in the form of an elongated hole, and the third through hole in the form of an elongated hole has a direction in which the second intermediate member performs linear motion as a longitudinal direction. The second intermediate member is screwed through the third through hole so as to be linearly movable along the long hole.

15. The tool according to any one of claims 1 to 4, characterized in that A single holding member is provided, and the single holding member holds the first intermediate member and the second intermediate member.

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