Tool and cover

Abstract

To suppress changing of set torque by an operator.SOLUTION: A tool 1 comprises: an output shaft 5; a motor 3; a housing 2; a clutch; an operation part; and a cover 6. The clutch switches, when torque transmitted from the motor 3 to the output shaft 5 becomes set torque or higher, a state from a transmission state of transmitting the torque to the output shaft 5 to a cut-off state of not transmitting the torque to the output shaft 5. The operation part is for setting the set torque. The cover 6 covers the operation part. The cover 6 includes a first cover and a second cover 8. The first cover is detachable from the housing 2 through rotation with respect to the housing 2. The second cover 8 covers the first cover. The second cover 8 can rotate integrally with the first cover in a first state, and can rotate idly with respect to the first cover in a second state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates generally to tools and covers, and more particularly to tools with motors and covers for use with tools. [Background technology]

[0002] Patent Document 1 discloses a power tool including a housing, a motor, and an output shaft. The power tool described in Patent Document 1 allows the clutch actuation torque to be set by rotating a dial. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-024043 Summary of the Invention [Problem to be solved by the invention]

[0004] Depending on the application of the power tool (tool), it may not be desirable for the operator to be able to freely change the clutch actuation torque (set torque) of the tool.

[0005] The present disclosure has been made in view of the above-mentioned circumstances, and aims to provide a tool and a cover that can prevent an operator from changing the set torque. [Means for solving the problem]

[0006] A tool according to one aspect of the present disclosure includes an output shaft, a motor, a housing, a clutch unit, an operating unit, and a cover. A tool bit is attached to the output shaft. The motor rotates the output shaft. When torque transmitted from the motor to the output shaft becomes equal to or greater than a set torque, the clutch unit switches from a transmission state in which the torque is transmitted to the output shaft to a disconnection state in which the torque is not transmitted to the output shaft. The operating unit is an operating unit for setting the set torque. The cover covers the operating unit. The cover includes a first cover and a second cover. The first cover can be attached to and detached from the housing by rotating it relative to the housing. The second cover covers the first cover. In a first state, the second cover can rotate integrally with the first cover, and in a second state, the second cover can rotate freely relative to the first cover.

[0007] A cover according to one aspect of the present disclosure is used as a cover for the tool. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to prevent an operator from changing the set torque. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic view showing a tool according to an embodiment. [Figure 2] FIG. 2 is a schematic view showing an operating unit provided in the tool. [Figure 3] FIG. 3 is a perspective view showing a main part of the tool. [Figure 4] FIG. 4 is an exploded perspective view of a cover provided in the tool. [Figure 5] FIG. 5 is a cross-sectional view showing a second state of the cover provided in the tool. [Figure 6] FIG. 6 is a cross-sectional view showing a first state of the cover provided in the tool. [Figure 7] FIG. 7 is a cross-sectional view showing a second state of the cover provided in the tool of the modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Common elements in the embodiments described below are designated by the same reference numerals, and redundant descriptions of the common elements may be omitted. The following embodiments and modifications are merely a portion of the various embodiments of the present disclosure. Various modifications of the following embodiments and modifications can be made depending on the design, etc., as long as the object of the present disclosure can be achieved. The configurations of the modifications can also be combined as appropriate.

[0011] The drawings described in this disclosure are schematic diagrams, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios. Note that the arrows indicating the directions in the drawings are merely examples and are not intended to define the directions in which the tool 1 should be used. Also, the arrows indicating the directions in the drawings are merely shown for the purpose of explanation and do not have any substance.

[0012] In this disclosure, "orthogonal (perpendicular)" refers not only to a state where the angle between two things is exactly 90 degrees, but also to a state where two things intersect within a certain range of difference. In other words, the angle between two orthogonal things is within a certain range of difference from 90 degrees (for example, 10 degrees or less). In other words, "orthogonal" in this disclosure includes a case where the angle between two things is between 80 degrees and 100 degrees. Similarly, "parallel" in this disclosure includes not only a case where two things do not strictly intersect, but also a case where two things are lined up within a certain range of difference. For example, "parallel" in this disclosure includes a case where one thing is inclined at an angle of 10 degrees or less relative to the other. In other words, "parallel" in this disclosure includes a case where the angle between one thing and the other is between -10 degrees and 10 degrees.

[0013] (1) Overview First, an overview of a tool 1 according to an embodiment will be described with reference to FIGS.

[0014] 1, the tool 1 of this embodiment is an electric power tool that can be held by, for example, a worker (or user) in one hand. A tool tip X1 such as a driver bit can be attached to the tool 1 of this embodiment. In this embodiment, the tool tip X1 is a driver bit, and the tool 1 is an electric screwdriver used for tightening screws.

[0015] The tool 1 includes an output shaft 5, a motor 3, a housing 2, a clutch unit 42 (see FIG. 2), an operating unit 9 (see FIG. 2), and a cover 6.

[0016] The output shaft 5 is fitted with a tool X1.

[0017] The motor 3 rotates the output shaft 5 .

[0018] When the torque transmitted from the motor 3 to the output shaft 5 becomes equal to or greater than the set torque, the clutch section 42 switches from a transmission state in which the torque is transmitted to the output shaft 5 to a disconnection state in which the torque is not transmitted to the output shaft 5.

[0019] The operation unit 9 is an operation unit for setting a set torque.

[0020] The cover 6 covers the operation unit 9. As shown in FIG.

[0021] The first cover 7 can be attached to and detached from the housing 2 by rotating it relative to the housing 2. The second cover 8 covers the first cover 7.

[0022] The second cover 8 is rotatable integrally with the first cover 7 in the first state, and is rotatable idly relative to the first cover 7 in the second state.

[0023] In some cases, such as when the tool 1 is used for assembly work on a factory assembly line, it may not be desirable for an operator to be able to change the set torque of the clutch unit 42. In the tool 1 of this embodiment, the cover 6 can be removed from the housing 2 of the tool 1 by rotating the first cover 7. Furthermore, in the tool 1, when the cover 6 is in the second state, the second cover 8 covering the first cover 7 rotates freely relative to the first cover 7. In other words, when the cover 6 is in the second state, an operator cannot rotate the first cover 7 and therefore cannot remove the cover 6 from the housing 2. Therefore, by having the operator use the tool 1 with the cover 6 in the second state, it is possible to prevent the operator from changing the set torque of the clutch unit 42.

[0024] (2) Details Hereinafter, a detailed configuration of the tool 1 according to this embodiment will be described with reference to Figs. 1 to 6. In this embodiment, the tool 1 is used for assembly work on an assembly line in a factory. Also, the tool 1 with the cover 6 in the second state is used by an operator.

[0025] The tool 1 of this embodiment is supplied with power from an external power source via a power line, but the tool 1 may also be configured to receive power from an attached battery pack.

[0026] 1, the tool 1 of this embodiment includes a main body 10 and a cover 6. In other words, the main body 10 is the portion of the tool 1 other than the cover 6.

[0027] (2.1) Main body configuration The main body 10 has a housing 2, a lever 24, a motor 3, a transmission mechanism 4, an output shaft 5, and an operating unit 9 (see FIG. 2). In this embodiment, the direction parallel to the rotation axis Ax1 (see FIG. 2) of the output shaft 5 is defined as the up-down direction. The direction from the output shaft 5 to the motor 3 is defined as the up direction, and the direction from the motor 3 to the output shaft 5 is defined as the down direction.

[0028] The housing 2 is formed in a tubular shape that extends in the vertical direction. In this disclosure, the term "tubular" may include a cylindrical shape, an elliptical cylindrical shape, and a rectangular cylindrical shape. The housing 2 has a first main body portion 21, a second main body portion 22, and a third main body portion 23.

[0029] The first main body 21 is formed in a rectangular cylindrical shape having an upper surface. The lower surface of the first main body 21 is a circular opening. The first main body 21 houses the control unit of the motor 3 and the like.

[0030] The second body portion 22 protrudes downward from the lower end of the first body portion 21. The second body portion 22 is formed in a cylindrical shape. The second body portion 22 houses the motor 3 and a part of the transmission mechanism 4.

[0031] A plurality of protrusions 221 are formed on the outer surface of the second main body portion 22. The plurality of protrusions 221 protrude outward from the outer surface of the second main body portion along a direction perpendicular to the up-down direction. The second main body portion 22 functions as a gripping portion that is held by an operator. The plurality of protrusions 221 also function as a non-slip surface when the operator grips the second main body portion 22.

[0032] The third main body portion 23 protrudes downward from the lower end of the second main body portion 22. The third main body portion 23 is formed in a cylindrical shape. The third main body portion 23 houses a part of the transmission mechanism 4.

[0033] As shown in FIG. 3, the third main body portion 23 has a screw thread 231 formed at the lower end thereof for attaching the cover 6 to the housing 2 (or the main body portion 10).

[0034] The lever 24 is provided on the outer surface of the first main body portion 21. The lever 24 is a switch (or an operating portion) for controlling the on / off operation of the motor 3. The lever 24 has an initial position and an on position, and the motor 3 is operated when the operator pushes or pulls the lever 24 to the on position. The lever 24 can also adjust the rotation speed of the motor 3 according to the amount of retraction (or operation amount). However, it is not essential for the tool 1 to have a configuration in which the rotation speed of the motor 3 is adjusted according to the amount of retraction of the lever 24. In other words, the tool 1 may have a configuration in which only the on / off control of the operation of the motor 3 is performed according to the amount of retraction of the lever 24, instead of a configuration in which the rotation speed of the motor 3 is adjusted according to the amount of retraction of the lever 24.

[0035] The motor 3 converts electric power supplied from an external power source into torque. The motor 3 is, for example, an inner rotor brushless motor. The rotor of the motor 3 rotates around the rotation axis Ax1 of the output shaft 5.

[0036] As shown in FIG. 1, the transmission mechanism 4 is disposed below the motor 3 in the internal space of the housing 2 (second main body portion 22). The transmission mechanism 4 is a mechanism that transmits the torque generated by the motor 3 to the output shaft 5. As shown in FIG. 2, the transmission mechanism 4 of this embodiment has a speed reduction mechanism 41 and a clutch portion 42. The transmission mechanism 4 may also have an impact mechanism that applies a rotational impact to the output shaft 5.

[0037] The speed reducing mechanism 41 is, for example, a planetary gear mechanism, and converts the rotation speed and torque of the motor 3 into the rotation speed and torque required for the fastening operation.

[0038] When the torque transmitted from the motor 3 to the output shaft 5 becomes equal to or greater than a set torque, the clutch unit 42 switches from a transmission state in which the torque is transmitted to the output shaft 5 to a disconnection state in which the torque is not transmitted to the output shaft 5. The clutch unit 42 may be realized by, for example, an electronic clutch.

[0039] 2, the operating unit 9 covers the clutch unit 42. The operating unit 9 is a clutch handle for setting the set torque of the clutch unit 42. The set torque of the clutch unit 42 is changed by rotating the operating unit 9 about the rotation axis Ax1.

[0040] As shown in Fig. 1, the output shaft 5 is disposed below the transmission mechanism 4. Torque generated by the motor 3 is transmitted to the output shaft 5 via the transmission mechanism 4. As the rotor of the motor 3 rotates, the output shaft 5 rotates about the rotation axis Ax1.

[0041] A tip tool X1 such as a driver bit is detachably attached to the tip (lower end) of the output shaft 5. For example, when a driver bit is attached to the output shaft 5, the driver bit can be rotated while being placed in contact with a fastening member (screw, etc.), thereby enabling the fastening member to be tightened or loosened.

[0042] (2.2) Cover configuration As shown in FIG. 1, the cover 6 covers the operating unit 9. In other words, when the cover 6 is attached to the housing 2 (or the main body 10), the operator cannot operate the operating unit 9. In other words, the cover 6 covers the operating unit 9, thereby preventing the operator from changing the set torque. Furthermore, the cover 6 of this embodiment has a configuration that prevents the operator from removing the cover 6 from the housing 2. This further prevents the operator from changing the set torque.

[0043] As shown in FIG. 4, the cover 6 has a first cover 7, a second cover 8, and a connecting member 61. The cover 6 of this embodiment has a first state and a second state. As shown in FIG. 6, the first state is a state in which the connecting member 61 connects the first cover 7 and the second cover 8. As shown in FIG. 5, the second state is a state in which the connecting member 61 does not connect the first cover 7 and the second cover 8. Note that the first cover 7 and the second cover 8 of this embodiment do not contact each other in the first state or the second state.

[0044] The connecting member 61 connects the first cover 7 and the second cover 8. The connecting member 61 in the first embodiment is a screw. In the present disclosure, the term "screw" includes a bolt.

[0045] The connecting member 61 of this embodiment is insertable into the first hole 74 of the first cover 7 and the second hole 81 of the second cover 8. The connecting member 61 is configured to be attachable to and detachable from the first cover 7 and the second cover 8. When the connecting member 61 is inserted into the first hole 74 and the second hole 81, the connecting member 61 connects the first cover 7 and the second cover 8. In other words, the state in which the connecting member 61 is inserted into the first hole 74 and the second hole 81 is the first state of the cover 6, and the state in which the connecting member 61 is not inserted into the first hole 74 and the second hole 81 is the second state of the cover 6. The connecting member 61 is inserted into and removed from the first hole 74 and the second hole 81 by, for example, an assembly line supervisor.

[0046] Since the connecting member 61 in this embodiment can be attached and detached to the first cover 7 and the second cover 8 (i.e., cover 6), for example, an assembly line supervisor or the like can remove the connecting member 61 from the cover 6 in advance, thereby preventing workers from changing the set torque.

[0047] The first cover 7 has a main body portion 70 and a support portion 71.

[0048] The main body 70 of this embodiment is formed from a synthetic resin. However, the main body 70 may also be formed from a metal such as iron or aluminum. The main body 70 can be attached to and detached from the housing 2 by rotating it relative to the screw threads 231 of the housing 2. The main body 70 has a cylindrical shape. That is, the first cover 7 has a cylindrical shape. The main body 70 has an outer surface 72, an inner surface 73, and a first hole 74. That is, the first cover 7 has the first hole 74. The first hole 74 is a hole that penetrates the main body 70 in a direction perpendicular to the rotation axis Ax1. However, the first hole 74 may be a recess instead of a through hole. The connecting member 61 is inserted into the first hole 74.

[0049] A first recess 721 is formed in the outer surface 72. In other words, the main body portion 70 of the first cover 7 has the first recess 721. The first recess 721 is a recess formed around the entire circumference of the main body portion 70 along the circumferential direction of the outer surface 72. The support portion 71 is fitted into the first recess 721. By fitting the support portion 71 into the first recess 721, the support portion 71 is supported by the main body portion 70.

[0050] The support portion 71 supports the second cover 8 in a state in which the second cover 8 can rotate freely relative to the first cover 7. The support portion 71 in this embodiment is separate from the main body portion 70. Because the support portion 71 is separate from the main body portion 70, for example, the material of the main body portion 70 and the material of the support portion 71 can be different.

[0051] The support portion 71 in this embodiment is a C-ring. This allows the second cover 8 to be supported with a relatively simple configuration in a state in which the second cover 8 can rotate freely relative to the first cover 7. The support portion 71 fits into the first recess 721 of the main body 70 and the second recess 831 of the second cover 8.

[0052] A screw thread 731 is formed on the upper end of the inner surface 73. The screw thread 731 is a screw thread that mates with the screw thread 231 of the housing 2.

[0053] The second cover 8 has a main body 80 and an insert nut 84 .

[0054] The main body 80 in this embodiment is formed from a synthetic resin. However, the main body 80 may be formed from a metal such as iron or aluminum. The main body 80 has a cylindrical shape. In other words, the second cover 8 has a cylindrical shape. The main body 80 has a second hole 81, an outer surface 82, and an inner surface 83. In other words, the second cover 8 has the second hole 81. The second hole 81 is a hole that penetrates the main body 80 in a direction perpendicular to the rotation axis Ax1. The connecting member 61 is inserted into the second hole 81. More specifically, in this embodiment, an insert nut 84 is inserted into the second hole 81, and the connecting member 61 is inserted into the insert nut 84.

[0055] A second recess 831 is formed in the inner surface 83. In other words, the main body 80 of the second cover 8 has the second recess 831. The second recess 831 is a recess formed along the circumferential direction of the inner surface 83. The second recess 831 of this embodiment has two ends in the circumferential direction of the inner surface 83. In other words, the second recess 831 of this embodiment is formed in a C-shape. The support portion 71 is fitted into the second recess 831. By fitting the support portion 71 into the second recess 831, the second cover 8 is supported by the support portion 71.

[0056] The insert nut 84 is made of a metal such as iron or aluminum. The insert nut 84 is inserted into the second hole 81. The connecting member 61 is inserted into the insert nut 84. A thread 841 is formed on the insert nut 84. In other words, the second cover 8 has the thread 841. The thread 841 fits with the thread of the connecting member 61, which is a screw.

[0057] The second cover 8 has the threads 841, so that the connecting member 61 can be fixed to the second cover 8 (or the cover 6). Furthermore, the insert nut 84 is provided with the threads 841, so that the connecting member 61, which is a screw, can be fixed to the second cover 8 (or the cover 6), which is made of, for example, synthetic resin.

[0058] As described above, the tool 1 or the cover 6 of this embodiment can prevent the operator from changing the set torque.

[0059] (3) Variations Modifications of the above embodiment are listed below.

[0060] In the above embodiment, the connecting member 61 is a screw. However, the connecting member 61 may be a member such as a pin that can be inserted into the first hole 74 of the first cover 7 and the second hole 81 of the second cover 8.

[0061] In the above embodiment, the case where the threads 841 of the second cover 8 are formed on the inner surface of the insert nut 84 has been exemplified. However, it is not essential that the second cover 8 has an insert nut, and the threads 841 may be formed in the second hole 81 of the second cover 8. Also, the threads 841 may be formed in the first hole 74 of the first cover 7. Furthermore, it is not essential that the first cover 7 or the second cover 8 have the threads 841.

[0062] In the above embodiment, the case where the support portion 71 is a C-ring has been described as an example. However, the support portion 71 may be, for example, a ball bearing, etc., as long as it is configured to support the second cover 8 in a state where the second cover 8 can rotate freely relative to the first cover 7.

[0063] As shown in FIG. 7 , the first cover 7 may have a support portion 71A instead of the support portion 71. The support portion 71A is formed on the outer surface 72 of the main body portion 70 of the first cover 7. The support portion 71A is a convex portion formed around the entire circumference of the main body portion 70 along the circumferential direction of the outer surface 72. For example, when a second recess 832 of the second cover 8 is caught on the support portion 71A of the first cover 7, the second cover 8 is supported by the first cover 7 in a swivelable state. The second recess 832 is formed on the inner surface 83 of the main body portion 80 of the second cover 8. The second recess 832 is a recess formed around the entire circumference of the main body portion 80 along the circumferential direction of the inner surface 83.

[0064] The tool 1 may be configured such that the operation of the motor 3 is switched on / off by the tool bit X1 being pushed closer to the motor 3.

[0065] In the above embodiment, the tool 1 is described as an electric screwdriver, but the tool 1 is not limited to an electric screwdriver and may be, for example, an impact driver, an impact wrench, a nut runner, an oil pulse wrench, etc. Furthermore, the tool 1 is not limited to an electric tool and may be an air tool having an air motor (drive unit) that operates with compressed air (power) supplied from an air compressor as a power source.

[0066] The cover 6 of the above embodiment may be distributed independently on the market. That is, the cover 6 used for the tool 1 of the above embodiment may be distributed independently on the market.

[0067] (summary) As is clear from the above-described embodiment and modified examples, the tool (1) according to the first aspect includes an output shaft (5), a motor (3), a housing (2), a clutch unit (42), an operating unit (9), and a cover (6). A tool bit (X1) is attached to the output shaft (5). The motor (3) rotates the output shaft (5). When the torque transmitted from the motor (3) to the output shaft (5) exceeds a set torque, the clutch unit (42) switches from a transmission state in which the torque is transmitted to the output shaft (5) to a disconnection state in which the torque is not transmitted to the output shaft (5). The operating unit (9) is used to set the set torque. The cover (6) covers the operating unit (9). The cover (6) has a first cover (7) and a second cover (8). The first cover (7) can be attached to and detached from the housing (2) by rotating it relative to the housing (2). The second cover (8) covers the first cover (7). The second cover (8) can rotate integrally with the first cover (7) in the first state, and can rotate freely relative to the first cover (7) in the second state.

[0068] According to this aspect, it is possible to prevent the operator from changing the set torque.

[0069] In the tool (1) according to the second aspect, in the first aspect, the cover (6) further includes a connecting member (61). The connecting member (61) connects the first cover (7) and the second cover (8). The first state is a state in which the connecting member (61) connects the first cover (7) and the second cover (8). The second state is a state in which the connecting member (61) does not connect the first cover (7) and the second cover (8).

[0070] In the tool (1) according to the third aspect, in the second aspect, the first cover (7) has a first hole (74). The second cover (8) has a second hole (81). The connecting member (61) is detachable from the first cover (7) and the second cover (8). When the connecting member (61) is inserted into the first hole (74) and the second hole (81), the connecting member (61) connects the first cover (7) and the second cover (8).

[0071] According to this aspect, it is possible to further prevent the operator from changing the set torque.

[0072] In the tool (1) according to the fourth aspect, the connecting member (61) in the third aspect is a screw. The second cover (8) has a thread (841) that fits with the screw (connecting member 61).

[0073] According to this embodiment, the connecting member (61) can be fixed to the second cover (8).

[0074] In the tool (1) according to the fifth aspect, in the fourth aspect, the threads (841) of the second cover (8) are formed on an insert nut (84) inserted into the second hole (81).

[0075] According to this embodiment, the connecting member (61), which is a screw, can be fixed to the second cover (8), which is made of, for example, synthetic resin.

[0076] In the tool (1) according to a sixth aspect, in any one of the first to fifth aspects, the first cover (7) has a support portion (71; 71A). The support portion (71; 71A) supports the second cover (8) in a state in which the second cover (8) can rotate freely relative to the first cover (7).

[0077] In the tool (1) according to the seventh aspect, in the sixth aspect, the first cover (7) further includes a main body (70). The main body (70) can be attached to and detached from the housing (2) by rotating it relative to the housing (2). The main body (70) of the first cover (7) is cylindrical. The main body (70) of the first cover (7) has a first recess (721). The second cover (8) is cylindrical and has a second recess (831). The first recess (721) is formed on the outer surface (72) of the main body (70). The second recess (831) is formed on the inner surface (83) of the second cover (8). The support portion (71) is separate from the main body (70) and is fitted into the first recess (721) of the main body (70) and the second recess (831) of the second cover (8).

[0078] According to this embodiment, the main body (70) and the support portion (71) can be made of different materials.

[0079] In the tool (1) according to the eighth aspect, in the seventh aspect, the support portion (71) of the first cover (7) is a C-ring.

[0080] According to this aspect, the second cover (8) can be supported in a state in which the second cover (8) can rotate freely relative to the first cover (7) with a relatively simple configuration.

[0081] The configurations other than those of the first aspect are not essential to the tool (1) and can be omitted as appropriate.

[0082] The cover (6) according to the ninth aspect is used as the cover (6) for the tool (1) according to any one of the first to eighth aspects.

[0083] According to this aspect, it is possible to prevent the operator from changing the set torque. [Explanation of symbols]

[0084] 1 tool 2. Housing 3 motors 42 Clutch section 5 Output shaft 6 Cover 61 Connecting member (screw) 7 First Cover 70 Main body 72 External surface 721 First recess 71 Support part (C ring) 71A Support part 74 Hole 1 8 Second Cover 81 2nd hole 83 Inner surface 831 Second recess 84 Insert nut 841 thread 9 Control section X1 Tip tool

Claims

1. Housing and an output shaft to which a tool tip is attached; a motor that rotates the output shaft; a clutch unit that switches from a transmission state in which the torque is transmitted to the output shaft to a disconnection state in which the torque is not transmitted to the output shaft when the torque transmitted from the motor to the output shaft becomes equal to or greater than a set torque; an operation unit for setting the set torque; a cover for covering the operation unit; Equipped with The cover is a first cover that is detachable from the housing by rotating it relative to the housing; a second cover that covers the first cover, that is rotatable integrally with the first cover in a first state, and that is rotatable idly relative to the first cover in a second state; having tool.

2. the cover further includes a connecting member that connects the first cover and the second cover, the first state is a state in which the connecting member connects the first cover and the second cover, The second state is a state in which the connecting member does not connect the first cover and the second cover. The tool of claim 1.

3. the first cover has a first hole; the second cover has a second hole; The connecting member is The first cover and the second cover are detachable, When the connector is inserted into the first hole and the second hole, the connector connects the first cover and the second cover. The tool of claim 2.

4. the connecting member is a screw, the second cover has threads that mate with the screws; The tool of claim 3.

5. The threads of the second cover are formed on an insert nut inserted into the second hole.

5. The tool of claim 4.

6. the first cover has a support portion that supports the second cover in a state in which the second cover can rotate freely relative to the first cover; The tool of claim 1.

7. the first cover further includes a main body portion that is detachable from the housing by rotating relative to the housing; The main body of the first cover has a cylindrical shape, the main body portion of the first cover has a first recess, the second cover is cylindrical and has a second recess; The first recess is formed in an outer surface of the main body, The second recess is formed on an inner surface of the second cover, the support portion is separate from the main body portion and is fitted into the first recess of the main body portion and the second recess of the second cover. The tool of claim 6.

8. The support portion of the first cover is a C-ring.

8. The tool of claim 7.

9. A tool according to claim 1, cover.

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