Power tool and cover unit

Abstract

To provide a technology that can recover powder dust occurring when a corner part of a workpiece is cut.SOLUTION: An electric tool includes: a motor; a power transmission mechanism connected to the motor; a housing which houses the motor and the power transmission mechanism; a holding part connected to the power transmission mechanism; a tip tool which is held by the holding part and may rotate around a rotation axis; and a cover unit 46. The cover unit includes: a cover 52 which covers at least a part of the tip tool; a first duct 54 connected to the cover at the first connection part 106; and a second duct 56 which is connected to the cover at a second connection part different from the first connection part.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The technology disclosed in this specification relates to power tools and cover units.

Background Art

[0002] Patent Document 1 discloses a power tool. The power tool includes a housing that houses a power transmission mechanism, a holding portion connected to the power transmission mechanism, a tip tool held by the holding portion and rotatable around a rotation axis, and a cover unit. The cover unit includes a cover that covers at least a part of the tip tool, and a duct connected to the cover.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When cutting a corner of a workpiece using the above power tool, the tip tool contacts the corner of the workpiece at two locations. Therefore, the dust generated by cutting scatters in a plurality of directions. There is a possibility that one duct may not be able to sufficiently collect the dust scattered in a plurality of directions. This specification provides a technology that can make it easier to collect the dust generated when cutting the corner of a workpiece.

Means for Solving the Problems

[0005] This specification discloses a power tool. The power tool includes a motor, a power transmission mechanism connected to the motor, a housing that houses the motor and the power transmission mechanism, a holding part connected to the power transmission mechanism, a tip tool that is held by the holding part and is rotatable around a rotation axis, and a cover unit. The cover unit includes a cover that covers at least a part of the tip tool, a first duct connected to the cover at a first connection part, and a second duct connected to the cover at a second connection part different from the first connection part.

[0006] In the above configuration, since the first duct and the second duct are connected to the cover, dust scattered in a plurality of directions can be collected by the first duct and the second duct. It is possible to facilitate the collection of dust generated when cutting a corner of a workpiece.

[0007] Further, this specification discloses a cover unit. The cover unit is used for a power tool that includes a power transmission mechanism connected to a motor, a holding part connected to the power transmission mechanism, and a tip tool that is held by the holding part and is rotatable around a rotation axis. The cover unit includes a cover that covers at least a part of the tip tool, a first duct connected to the cover at a first connection part, and a second duct connected to the cover at a second connection part different from the first connection part.

[0008] In the above configuration, since the first duct and the second duct are connected to the cover, dust scattered in a plurality of directions can be collected by the first duct and the second duct. It is possible to facilitate the collection of dust generated when cutting a corner of a workpiece.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0010] Regarding representative and non-limiting specific examples of the present invention, they will be described in detail below with reference to the drawings. This detailed description is simply intended to show those skilled in the art the details for implementing preferred examples of the present invention, and is not intended to limit the scope of the present invention. Also, the additional features and inventions disclosed can be used separately or together with other features and inventions in order to provide further improved power tools and cover units.

[0011] Also, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense, and are described only for the purpose of explaining representative specific examples of the present invention in particular. Furthermore, the various features of the following representative specific examples, as well as the various features described in the claims, do not have to be combined as described in the specific examples here or in the order listed in order to provide additional and useful embodiments of the present invention.

[0012] All features described in this specification and / or the claims are intended to be disclosed separately and independently of each other, as limitations to the initial disclosure and the specific matters described in the claims, apart from the configuration of the features described in the embodiments and / or the claims. Further, all descriptions regarding numerical ranges and groups or collections are made with the intention of disclosing intermediate configurations as limitations to the initial disclosure and the specific matters described in the claims.

[0013] In one or more embodiments, the position of the first connection portion may be substantially equal to the position where the second connection portion is rotated 180 degrees around the rotation axis.

[0014] In the above configuration, since the first duct and the second duct are arranged at positions opposite to each other with respect to the rotation axis, it is possible to more easily collect dust scattered in a plurality of directions.

[0015] In one or more embodiments, the cover may include a side wall portion facing the outer peripheral surface of the tip tool. The first connection portion and the second connection portion may be arranged on the side wall portion.

[0016] Normally, the dust generated when the tip tool cuts the corner of the workpiece scatters toward the side wall portion. When the first duct and the second duct are not connected to the side wall portion, for example, when the first duct and the second duct are connected to the upper wall portion of the cover, since there is little dust scattering toward the upper wall portion, there is a possibility that the dust cannot be collected. According to the above configuration, since the first duct and the second duct are connected to the side wall portion, it is possible to more easily collect the dust scattered toward the side wall portion.

[0017] In one or more embodiments, the first connection portion and the second connection portion may be arranged at positions farther from the rotation axis than the tip tool.

[0018] Generally, the dust generated when the tip tool cuts the corner of the workpiece scatters in a direction away from the rotation axis. According to the above configuration, the scattered dust can be easily collected by the first duct and the second duct.

[0019] In one or more embodiments, the cover may include a first cover to which the first duct is connected and a second cover to which the second duct is connected.

[0020] When the cover is made of one member, the cover is often designed to correspond to a workpiece having a specific shape and often does not correspond to a workpiece having another shape. In order to accommodate workpieces of various shapes, a cover made of a plurality of members may be desired. When the cover is made of a plurality of members, the dust generated when the tip tool cuts the corner of the workpiece scatters toward each of the plurality of members of the cover. According to the above configuration, since the first duct is connected to the first cover and the second duct is connected to the second cover, it is possible to more easily collect the dust scattered toward the first cover and the dust scattered toward the second cover.

[0021] In one or more embodiments, the first cover may be openable and closable by rotating relative to the second cover.

[0022] In the above configuration, compared with the case where the first cover opens and closes by sliding relative to the second cover, the mechanism for opening and closing the first cover relative to the second cover can be simplified.

[0023] In one or more embodiments, the first cover may be rotatable around a first rotation shaft with respect to the housing. The second cover may be rotatable around a second rotation shaft with respect to the housing.

[0024] In the above configuration, even if the shape of the corner of the workpiece changes when the tip tool cuts the corner of the workpiece, the rotation angle with respect to the tip tool is separately adjusted by both the first cover and the second cover. As a result, the contact state between the tip tool and the corner of the workpiece can be maintained while cutting the corner of the workpiece.

[0025] In one or more embodiments, the first rotation shaft may be arranged on the same straight line as the second rotation shaft.

[0026] In the above configuration, the mechanism for rotating the first cover and the mechanism for rotating the second cover can be simplified.

[0027] In one or more embodiments, the first rotation shaft and the second rotation shaft may be substantially orthogonal to the rotation axis.

[0028] In the above configuration, the mechanism for rotating the first cover and the mechanism for rotating the second cover can be further simplified.

[0029] In one or more embodiments, the cover unit may further include a biasing member that biases the first cover in a closing direction with respect to the second cover.

[0030] In the above configuration, the first cover can be automatically closed with respect to the second cover.

[0031] In one or more embodiments, when the first cover is closed with respect to the second cover, a first space into which the workpiece can be inserted may be formed between the first cover and the second cover.

[0032] In the above configuration, with the first cover closed with respect to the second cover, by inserting the corner of the workpiece into the first space, the first cover can be rotated with respect to the second cover so as to match the shape of the corner of the workpiece.

[0033] In one or more embodiments, the cover may be rotatably supported relative to the housing.

[0034] When the corner of the workpiece is not in front of the user's body, the user needs to change the posture of the power tool in front of the body to align the cover with the corner of the workpiece. If the cover cannot rotate relative to the housing, the user has to cut the corner of the workpiece with the tip tool without being able to change the posture of the power tool, resulting in poor maneuverability of the power tool. According to the above configuration, after the user aligns the cover with the corner of the workpiece, the user can change the posture of the power tool by rotating the cover relative to the housing. Thereby, the user can hold the power tool in a stable posture and cut the corner of the workpiece with the tip tool. The maneuverability of the power tool can be improved.

[0035] In one or more embodiments, the cover may be rotatably supported relative to the housing about a rotation axis.

[0036] In the above configuration, after the user aligns the cover with the corner of the workpiece, the user can easily change the posture of the power tool by rotating the cover about the rotation axis. Thereby, the user can hold the power tool in a stable posture and cut the corner of the workpiece with the tip tool. The maneuverability of the power tool can be further improved.

[0037] In one or more embodiments, the power tool may be detachably attached to the housing and further include a battery pack for supplying power to the motor.

[0038] In the above configuration, the maneuverability of the power tool can be improved as compared with the case where the power tool is configured to receive power supply from an external power source via a power cord.

[0039] (Example) Referring to FIGS. 1 to 7, the power tool 2 of the embodiment will be described. The power tool 2 is, for example, a grinder. As shown in FIG. 2, the power tool 2 cuts a workpiece 1 such as concrete, blocks, bricks, and stone by rotating the tip tool 4 around the rotation axis AX. In the following description, the longitudinal direction of the power tool 2 is referred to as the front-rear direction, the direction in which the rotation axis AX extends is referred to as the vertical direction, and the direction orthogonal to the front-rear direction and the vertical direction is referred to as the left-right direction.

[0040] As shown in FIG. 1, the power tool 2 includes a housing 6. The housing 6 includes a main housing 10, a gear housing 12, and a bearing box 14.

[0041] A battery pack B is detachably attached to the rear surface of the main housing 10. The power tool 2 operates using the power of the battery pack B. In a modified example, the power tool 2 may receive power supply from an external power source via a power cord. The rear part of the main housing 10 is gripped by the user when the user uses the power tool 2. A slide switch 16 is attached to the upper front side of the main housing 10. As shown in FIG. 2, a motor 20 is housed inside the main housing 10. The motor 20 is controlled by a control unit (not shown) according to the operation of the slide switch 16. The motor 20 is driven by the power supplied from the battery pack B. The motor shaft 22 of the motor 20 extends in the front-rear direction, and the vicinity of the tip of the motor shaft 22 is disposed inside the gear housing 12. The motor shaft 22 is rotatably supported by the main housing 10 via bearings 24 and 26.

[0042] The gear housing 12 is connected to the front end portion of the main housing 10. Inside the gear housing 12, a power transmission mechanism 28 is accommodated. The power transmission mechanism 28 includes a first bevel gear 30 connected near the tip end portion of the motor shaft 22, and a second bevel gear 32 arranged to mesh with the first bevel gear 30. The second bevel gear 32 is connected near the upper end portion of the holding portion 34. The holding portion 34 is, for example, a spindle. The holding portion 34 extends in the vertical direction. The holding portion 34 is substantially orthogonal to the motor shaft 22. The upper end portion of the holding portion 34 is rotatably supported by the gear housing 12 via a bearing 36.

[0043] The bearing box 14 is connected to the lower end portion of the gear housing 12. The bearing box 14 rotatably supports the holding portion 34 via a bearing 38. The holding portion 34 projects downward from the bearing box 14. An engagement groove 39 is formed in the bearing box 14. The engagement groove 39 extends in the circumferential direction over the entire outer peripheral surface of the bearing box 14.

[0044] An upper flange 40 and a lower flange 41 are connected to the holding portion 34. The lower flange 41 is arranged below the upper flange 40. The tip tool 4 is held by the holding portion 34 by being clamped between the upper flange 40 and the lower flange 41. The tip tool 4 is, for example, an offset diamond wheel (i.e., a cup diamond). The tip tool 4 cuts the workpiece 1 by having its lower surface pressed against the workpiece 1. The tip tool 4 rotates around the rotation axis AX when the motor 20 is driven.

[0045] The power tool 2 further includes a cover unit 46. As shown in FIG. 3, the cover unit 46 includes a mounting member 48, a cover 52, a first duct 54, and a second duct 56. The mounting member 48 includes a cylindrical portion 62 and arms 64, 66. The cylindrical portion 62 has a cylindrical shape. Two engaging ribs 62a are formed on the inner peripheral surface of the cylindrical portion 62. The two engaging ribs 62a face each other. The two engaging ribs 62a extend along the circumferential direction of the inner peripheral surface of the cylindrical portion 62. The two engaging ribs 62a are separated from each other with respect to the circumferential direction of the inner peripheral surface of the cylindrical portion 62. As shown in FIG. 2, the engaging rib 62a is fitted into the engaging groove 39. Thereby, the mounting member 48 is attached to the bearing box 14. Further, when the engaging rib 62a slides within the engaging groove 39, the mounting member 48 can rotate around the rotation axis AX around the bearing box 14.

[0046] As shown in FIG. 3, the arms 64, 66 extend from the outer peripheral surface of the cylindrical portion 62 toward the outside in the radial direction of the cylindrical portion 62. The position of the arm 64 is substantially equal to the position where the arm 66 is rotated 180 degrees around the rotation axis AX.

[0047] The cover 52 is configured to be openable and closable. As shown in FIG. 2, when the cover 52 is in the closed state, the upper surface of the tip tool 4 and most of the outer peripheral surface of the tip tool 4 are covered by the cover 52, and only a part of the outer peripheral surface of the tip tool 4 is exposed. As shown in FIG. 5, when the cover 52 is in the fully open state, the upper surface of the tip tool 4 is covered by the cover 52. As shown in FIG. 3, the cover 52 is attached to the mounting member 48. The cover 52 can rotate around the rotation axis AX around the bearing box 14 integrally with the mounting member 48. The cover 52 includes a first cover 68 and a second cover 70.

[0048] As shown in FIG. 4, the first cover 68 defines the outer shape of the front half of the cover 52. The first cover 68 includes a first cover body 72, first support portions 74 and 76, and a first rotation shaft 78. The first cover body 72 includes a first upper wall portion 80 and a first side wall portion 82. In the first upper wall portion 80, a plate obtained by half-dividing a disk-shaped plate with a hole in the center is connected to the outside of a plate obtained by half-dividing a frustum-shaped plate with a hole in the center. The first side wall portion 82 extends from the outer peripheral edge of the first upper wall portion 80 in a direction away from the first upper wall portion 80 (downward in FIG. 4). The first side wall portion 82 extends along the circumferential direction of the outer peripheral surface of the first upper wall portion 80. The first side wall portion 82 faces the outer peripheral surface of the tip tool 4 (see FIG. 2). The vertical length of the first side wall portion 82 is the largest at the central portion of the first upper wall portion 80 with respect to the circumferential direction of the outer peripheral surface of the first upper wall portion 80, and decreases from the central portion toward both ends. The lower surface of the first side wall portion 82 is disposed on a plane inclined with respect to the first upper wall portion 80.

[0049] The first support portions 74 and 76 project upward from the upper surface of the first upper wall portion 80. With respect to the circumferential direction of the first upper wall portion 80, the first support portion 74 is disposed near one end, and the first support portion 76 is disposed near the other end. A first through hole 74a is formed in the first support portion 74. The first through hole 74a penetrates the first support portion 74 in the left-right direction near the upper end of the first support portion 74. The first rotation shaft 78 is disposed in the first support portion 76. The first rotation shaft 78 includes a first left rotation shaft 78a that extends leftward from the left surface of the first support portion 76 near the upper end of the first support portion 76, and a first right rotation shaft 78b that extends rightward from the right surface of the first support portion 76 near the upper end of the first support portion 76.

[0050] The second cover 70 defines the outer shape of the latter half of the cover 52. The second cover 70 includes a second cover body 86, second support portions 88 and 90, and a second rotation shaft 92. The second cover body 86 includes a second upper wall portion 94 and second side wall portions 96. In the second upper wall portion 94, a plate obtained by half-dividing a disk with a hole in the center is connected to the outside of a plate obtained by half-dividing a frustum-shaped plate with a hole in the center. As shown in FIG. 2, when the cover 52 is in the closed state, the first upper wall portion 80 and the second upper wall portion 94 surround the outer peripheral surface of the lower end portion of the cylindrical portion 62 and cover the upper surface of the tip tool 4. Here, the closed state of the cover 52 means the state in which the first cover 68 is closest to the second cover 70. As shown in FIG. 5, when the cover 52 is in the fully open state, the first upper wall portion 80 and the second upper wall portion 94 surround the outer peripheral surface of the upper portion of the cylindrical portion 62 and cover the upper surface of the tip tool 4.

[0051] As shown in FIG. 4, the second side wall portion 96 extends from the outer peripheral edge of the second upper wall portion 94 in a direction away from the second upper wall portion 94 (downward in FIG. 4). The second side wall portion 96 extends along the circumferential direction of the outer peripheral surface of the second upper wall portion 94. The second side wall portion 96 faces the outer peripheral surface of the tip tool 4 (see FIG. 2). As shown in FIG. 2, when the cover 52 is in the closed state, the first side wall portion 82 and the second side wall portion 96 cover most of the outer peripheral surface of the tip tool 4. As shown in FIG. 5, when the cover 52 is in the fully open state, the first side wall portion 82 and the second side wall portion 96 cover a part of the outer peripheral surface of the tip tool 4. As shown in FIG. 4, the vertical length of the second side wall portion 96 is the largest at the central portion with respect to the circumferential direction of the outer peripheral surface of the second upper wall portion 94, and decreases from the central portion toward both ends. The lower surface of the second side wall portion 96 is disposed on a plane inclined with respect to the second upper wall portion 94. Further, when the cover 52 is in the closed state, the lower surface of the second side wall portion 96 is inclined with respect to the lower surface of the first side wall portion 82. Even when the cover 52 is in the closed state, the lower surface of the second side wall portion 96 does not contact the lower surface of the first side wall portion 82. Hereinafter, the gap formed between the lower surface of the second side wall portion 96 and the lower surface of the first side wall portion 82 is referred to as a first space 98.

[0052] The second support portions 88 and 90 project upward from the upper surface of the second upper wall portion 94. In the circumferential direction of the second upper wall portion 94, the second support portion 88 is disposed near one end, and the second support portion 90 is disposed near the other end. A second through hole 88a is formed in the second support portion 88. The second through hole 88a penetrates the second support portion 88 in the left - right direction near the upper end of the second support portion 88. A first right - side rotation shaft 78b is inserted into the second through hole 88a from the left side. The second rotation shaft 92 is disposed on the same straight line as the first rotation shaft 78. The second rotation shaft 92 includes a second left - side rotation shaft 92a that extends leftward from the left surface of the second support portion 90 near the upper end of the second support portion 90, and a second right - side rotation shaft 92b that extends rightward from the right surface of the second support portion 90 near the upper end of the second support portion 90. The second left - side rotation shaft 92a is inserted into the first through hole 74a of the first support portion 74 from the right side. When the first right - side rotation shaft 78b is inserted into the second through hole 88a and the second left - side rotation shaft 92a is inserted into the first through hole 74a, the first cover 68 can rotate relative to the second cover 70 and can be opened and closed with respect to the second cover 70.

[0053] As shown in FIG. 6, insertion holes 64a and 66a are formed in each of the arm portions 64 and 66. Each of the insertion holes 64a and 66a is recessed from the respective side surfaces of the arm portions 64 and 66 toward the inner side in the radial direction of the cylindrical portion 62. The first left - side rotation shaft 78a is inserted into the insertion hole 64a. The first left - side rotation shaft 78a is rotatably supported by the arm portion 64. The second right - side rotation shaft 92b is inserted into the insertion hole 66a. The second right - side rotation shaft 92b is rotatably supported by the arm portion 66. Therefore, the first cover 68 and the second cover 70 are rotatably supported by the attachment member 48.

[0054] As shown in FIG. 4, the cover unit 46 further includes biasing members 100 and 102. The biasing members 100 and 102 are, for example, torsion springs. The biasing member 100 is attached to the first right rotation shaft 78b. One end of the biasing member 100 is fixed to the first support portion 76, and the other end of the biasing member 100 is fixed to the second support portion 88. The biasing member 102 is attached to the second left rotation shaft 92a. One end of the biasing member 102 is fixed to the second support portion 90, and the other end of the biasing member 102 is fixed to the first support portion 74. The biasing members 100 and 102 bias the first cover 68 in a direction to close it with respect to the second cover 70.

[0055] Next, the first duct 54 and the second duct 56 will be described. The first duct 54 is integrally formed with the first cover 68. The first duct 54 is disposed in the vicinity of the first support portion 74. The first duct 54 is connected to the first side wall portion 82 at the first connection portion 106. The second duct 56 is integrally formed with the second cover 70. The second duct 56 is disposed in the vicinity of the second support portion 88. The second duct 56 is connected to the second side wall portion 96 at the second connection portion 108.

[0056] As shown in FIG. 7, the position of the first connection portion 106 is substantially equal to the position obtained by rotating the second connection portion 108 by 180 degrees around the rotation axis AX. When the cover 52 is viewed from below, the first connection portion 106 and the second connection portion 108 are disposed on the tangent line of the outer peripheral surface of the tip tool 4. The first connection portion 106 and the second connection portion 108 face the outer peripheral surface of the tip tool 4. The first connection portion 106 and the second connection portion 108 are disposed at positions farther from the rotation axis AX than the outer peripheral surface of the tip tool 4.

[0057] The first duct 54 extends forward from the first connection part 106. The first duct 54 communicates with the internal space of the cover 52. A first adapter 112 is inserted into the discharge port of the first duct 54. The second duct 56 extends from the second connection part 108 toward the rear side (i.e., the direction opposite to the direction in which the first duct 54 extends). The directions in which the first duct 54 extends and the second duct 56 extends are in contact with the outer peripheral surface of the tip tool 4. The second duct 56 communicates with the internal space of the cover 52. A second adapter 114 is inserted into the discharge port of the second duct 56. The second adapter 114 includes a base part 114a and a branch part 114b. A dust collection hose (not shown) extending from a dust collector (not shown) can be attached to the base part 114a. The branch part 114b is connected to the first adapter 112 via a connecting hose 116. Thereby, the internal space of the second adapter 114 communicates with the internal space of the first adapter 112 via the connecting hose 116.

[0058] Next, an operation of cutting a corner portion of the workpiece 1 using the power tool 2 will be described. As shown in FIG. 1, first, the user inserts the corner portion of the workpiece 1 into a first space 98 (see FIG. 3) between the lower surface of the first side wall portion 82 and the lower surface of the second side wall portion 96. Depending on the shape of the workpiece 1, the first cover 68 rotates around the first rotating shaft 78, and the second cover 70 rotates around the second rotating shaft 92. The positions of the first cover 68 and the second cover 70 with respect to the workpiece 1 are separately adjusted according to the shape of the corner portion of the workpiece 1. As shown in FIG. 2, the lower surface of the first side wall portion 82 and the lower surface of the second side wall portion 96 abut against the outer surface of the workpiece 1. For example, compared with the case where the first cover 68 does not rotate relative to the second cover 70, the gap between the lower surface of the first side wall portion 82 and the outer surface of the workpiece 1, and the gap between the lower surface of the second side wall portion 96 and the outer surface of the workpiece 1 are reduced. Also, the corner portion of the workpiece 1 can be cut into an arc shape (R chamfering). For example, when the cover 52 is formed of one member, it is necessary to replace the cover 52 according to the size and shape of the workpiece 1 to be chamfered. On the other hand, in the present embodiment, since the positions of the first cover 68 and the second cover 70 with respect to the workpiece 1 are separately adjusted, it is not necessary to replace the cover 52 according to the size and shape of the workpiece 1. For example, the corner portion of the workpiece 1 can be C-chamfered without replacing the cover 52 according to the size and shape of the corner portion of the workpiece 1. Further, the cover unit 46 is rotatable around the rotation axis AX with respect to the housing 6 according to the shape of the workpiece 1. After the corner portion of the workpiece 1 is inserted into the first space 98, the user rotates the held housing 6 around the rotation axis AX with the front of the body facing it. The user can adjust the posture of the power tool 2 while maintaining the state where the corner portion of the workpiece 1 is inserted into the first space 98. Thereby, for example, even when the working area is narrow or the workpiece 1 is at a low position such as at the user's feet, the user can easily work using the power tool 2. As shown in FIG. 6, when the corner portion of the workpiece 1 is inserted into the first space 98, the lower surface of the tip tool 4 abuts against two locations of the corner portion of the workpiece 1. Hereinafter, the locations where the lower surface of the tip tool 4 abuts against the corner portion of the workpiece 1 will be referred to as a first location 120 and a second location 122.In FIGS. 6 and 7, the positions of the first location 120 and the second location 122 are illustrated by dashed lines.

[0059] Next, when the user operates the slide switch 16 (see FIG. 1), the tip tool 4 rotates around the rotation axis AX. The lower surface of the tip tool 4 cuts the corner of the workpiece 1. Since the lower surfaces of the first side wall portion 82 and the second side wall portion 96 are in contact with the outer surface of the workpiece 1, the dust generated by cutting is less likely to leak outside the cover 52 from the gaps between the lower surface of the first side wall portion 82 and the outer surface of the workpiece 1 and between the lower surface of the second side wall portion 96 and the outer surface of the workpiece 1. Also, as shown in FIG. 7, the dust generated by cutting scatters from the first location 120 toward the front side (i.e., the direction away from the rotation axis AX) and scatters from the second location 122 toward the rear side (i.e., the direction away from the rotation axis AX). The direction in which the dust scatters from the first location 120 is opposite to the direction in which the dust scatters from the second location 122. The dust that scatters from the first location 120 toward the front side enters the internal space of the first duct 54 from the first connection portion 106. Also, the dust that scatters from the second location 122 toward the rear side enters the internal space of the second duct 56 from the second connection portion 108. The dust that has entered the internal space of the first duct 54 enters the internal space of the second adapter 114 from the branch portion 114b via the first adapter 112 and the connecting hose 116. The dust that has entered the internal space of the second duct 56 enters the base portion 114a and merges with the dust that has passed through the internal space of the first duct 54. The merged dust is collected by a dust collector (not shown) via a dust collection hose (not shown).

[0060] In addition, the power tool 2 can also be used to cut a flat surface. As shown in FIG. 3, the user presses the lower surfaces of the first side wall portion 82 and the second side wall portion 96 of the cover 52 in the closed state against the flat surface. As a result, the first cover 68 rotates around the first rotation shaft 78, and the second cover 70 rotates around the second rotation shaft 92. The cover 52 switches to a state slightly closed compared to the fully open state of the cover 52 shown in FIG. 5. The entire lower surface of the tip tool 4, a part of the lower surface of the first side wall portion 82, and a part of the lower surface of the second side wall portion 96 abut against the flat surface. When the user operates the slide switch 16 (see FIG. 1), the tip tool 4 rotates around the rotation axis AX, and the flat surface is cut.

[0061] (Effect) The power tool 2 of this embodiment includes a motor 20, a power transmission mechanism 28 connected to the motor 20, a housing 6 that houses the motor 20 and the power transmission mechanism 28, a holding portion 34 connected to the power transmission mechanism 28, a tip tool 4 that is held by the holding portion 34 and is rotatable around the rotation axis AX, and a cover unit 46. The cover unit 46 includes a cover 52 that covers at least a part of the tip tool 4, a first duct 54 connected to the cover 52 at a first connection portion 106, and a second duct 56 connected to the cover 52 at a second connection portion 108 different from the first connection portion 106.

[0062] In the above configuration, since the first duct 54 and the second duct 56 are connected to the cover 52, dust scattered in a plurality of directions can be collected by the first duct 54 and the second duct 56. It is possible to facilitate the collection of dust generated when cutting the corner portion of the workpiece 1.

[0063] The cover unit 46 of this embodiment is used in the power tool 2 including a power transmission mechanism 28 connected to the motor 20, a holding portion 34 connected to the power transmission mechanism 28, and a tip tool 4 held by the holding portion 34 and rotatable around the rotation axis AX. The cover unit 46 includes a cover 52 that covers at least a part of the tip tool 4, a first duct 54 connected to the cover 52 at the first connection portion 106, and a second duct 56 connected to the cover 52 at a second connection portion 108 different from the first connection portion 106.

[0064] In the above configuration, since the first duct 54 and the second duct 56 are connected to the cover 52, dust scattered in a plurality of directions can be collected by the first duct 54 and the second duct 56. It is possible to facilitate the collection of dust generated when cutting the corner portion of the workpiece 1.

[0065] The position of the first connection portion 106 is substantially equal to the position obtained by rotating the second connection portion 108 by 180 degrees around the rotation axis AX.

[0066] In the above configuration, since the first duct 54 and the second duct 56 are arranged at positions on opposite sides with respect to the rotation axis AX, it is possible to more easily collect dust scattered in a plurality of directions.

[0067] The cover 52 includes a first side wall portion 82 and a second side wall portion 96 facing the outer peripheral surface of the tip tool 4. The first connection portion 106 and the second connection portion 108 are arranged on the first side wall portion 82 and the second side wall portion 96.

[0068] Generally, the dust generated when the tip tool 4 cuts the corner of the workpiece 1 scatters toward the first side wall portion 82 and the second side wall portion 96. When the first duct 54 and the second duct 56 are not connected to the first side wall portion 82 and the second side wall portion 96, for example, when the first duct 54 and the second duct 56 are connected to the first upper wall portion 80 and the second upper wall portion 94, since there is little dust scattering toward the first upper wall portion 80 and the second upper wall portion 94, there is a possibility that the dust cannot be recovered. According to the above configuration, since the first duct 54 and the second duct 56 are connected to the first side wall portion 82 and the second side wall portion 96, it is possible to make it easier to recover the dust scattering toward the first side wall portion 82 and the second side wall portion 96.

[0069] The first connecting portion 106 and the second connecting portion 108 are arranged at positions farther from the rotation axis AX than the tip tool 4.

[0070] Generally, the dust generated when the tip tool 4 cuts the corner of the workpiece 1 scatters in a direction away from the rotation axis AX. According to the above configuration, it is possible to make it easier to recover the scattered dust by the first duct 54 and the second duct 56.

[0071] The cover 52 includes a first cover 68 to which the first duct 54 is connected and a second cover 70 to which the second duct 56 is connected.

[0072] When the cover 52 is made of one member, the cover 52 is often designed to correspond to a workpiece 1 having a certain specific shape and often does not correspond to a workpiece 1 having another shape. In order to correspond to workpieces 1 of various shapes, a cover 52 made of a plurality of members may be desired. When the cover 52 is made of a plurality of members, the dust generated when the tip tool 4 cuts the corner of the workpiece 1 scatters toward each of the plurality of members of the cover 52. According to the above configuration, since the first duct 54 is connected to the first cover 68 and the second duct 56 is connected to the second cover 70, it is possible to make it easier to recover the dust scattering toward the first cover 68 and the dust scattering toward the second cover 70.

[0073] The first cover 68 can be opened and closed by rotating relative to the second cover 70.

[0074] In the above configuration, compared with the case where the first cover 68 slides relative to the second cover 70 to open and close, the mechanism for opening and closing the first cover 68 relative to the second cover 70 can be simplified.

[0075] The first cover 68 is rotatable around a first rotation shaft 78 with respect to the housing 6. The second cover 70 is rotatable around a second rotation shaft 92 with respect to the housing 6.

[0076] In the above configuration, even if the shape of the corner of the workpiece 1 changes when the tip tool 4 cuts the corner of the workpiece 1, the rotation angles with respect to the tip tool 4 are separately adjusted for both the first cover 68 and the second cover 70. Thereby, while cutting the corner of the workpiece 1, the contact state between the tip tool 4 and the corner of the workpiece 1 can be maintained.

[0077] The first rotation shaft 78 is arranged on the same straight line as the second rotation shaft 92.

[0078] In the above configuration, the mechanism for rotating the first cover 68 and the mechanism for rotating the second cover 70 can be simplified.

[0079] The first rotation shaft 78 and the second rotation shaft 92 are substantially orthogonal to the rotation axis AX.

[0080] In the above configuration, the mechanism for rotating the first cover 68 and the mechanism for rotating the second cover 70 can be further simplified.

[0081] The cover unit 46 further includes biasing members 100, 102 that bias the first cover 68 in a direction to close it with respect to the second cover 70.

[0082] In the above configuration, the first cover 68 can be automatically closed with respect to the second cover 70.

[0083] When the first cover 68 is closed with respect to the second cover 70, a first space 98 into which the workpiece 1 can be inserted is formed between the first cover 68 and the second cover 70.

[0084] In the above configuration, with the first cover 68 closed with respect to the second cover 70, by inserting a corner portion of the workpiece 1 into the first space 98, the first cover 68 can be rotated with respect to the second cover 70 so as to conform to the shape of the corner portion of the workpiece 1.

[0085] The cover 52 is rotatably supported with respect to the housing 6.

[0086] When the corner portion of the workpiece 1 is not in front of the user's body, the user needs to change the posture of the power tool 2 in front of the body to align the cover 52 with the corner portion of the workpiece 1. If the cover 52 cannot rotate with respect to the housing 6, the user has to cut the corner portion of the workpiece 1 with the tip tool 4 while being unable to change the posture of the power tool 2, resulting in poor maneuverability of the power tool 2. According to the above configuration, after the user aligns the cover 52 with the corner portion of the workpiece 1, the user can change the posture of the power tool 2 by rotating the cover 52 with respect to the housing 6. Thereby, the user can hold the power tool 2 in a stable posture and cut the corner portion of the workpiece 1 with the tip tool 4. The maneuverability of the power tool 2 can be improved.

[0087] The cover 52 is rotatably supported with respect to the housing 6 around the rotation axis AX.

[0088] In the above configuration, after the user aligns the cover 52 with the corner of the workpiece 1, the user can easily change the posture of the power tool 2 by rotating the cover 52 around the rotation axis AX. As a result, the user can hold the power tool 2 in a stable posture and cut the corner of the workpiece 1 with the tip tool 4. The maneuverability of the power tool 2 can be improved further.

[0089] The power tool 2 is detachably attached to the housing 6 and further includes a battery pack B for supplying power to the motor 20.

[0090] In the above configuration, compared with the case where the power tool 2 is configured to receive power supply from an external power source via a power cord, the maneuverability of the power tool 2 can be improved.

[0091] (Corresponding relationship) The first side wall portion 82 and the second side wall portion 96 are an example of the "side wall portion".

[0092] The cover unit 46 according to an embodiment may not include the biasing members 100 and 102. In this case, the first cover 68 and the second cover 70 rotate in the closing direction by their own weights.

[0093] The position of the first connection portion 106 according to an embodiment may not be equal to the position obtained by rotating the second connection portion 108 by 180 degrees around the rotation axis AX.

[0094] The first duct 54 according to an embodiment may be connected to the first upper wall portion 80. Also, the second duct 56 may be connected to the second upper wall portion 94.

[0095] The cover 52 according to an embodiment may be formed from one member.

[0096] The first rotation shaft 78 according to an embodiment may not be arranged on the same straight line as the second rotation shaft 92.

[0097] The first rotating shaft 78 and the second rotating shaft 92 according to one embodiment may not be orthogonal to the rotation axis AX.

[0098] The cover 52 according to one embodiment may not be rotatably supported with respect to the housing 6.

[0099] The first duct 54 according to one embodiment may be separate from the first cover 68. Also, the second duct 56 may be separate from the second cover 70.

[0100] The first adapter 112 according to one embodiment may be configured to be directly insertable into the first cover 68 at the first connection portion 106. In this case, the first adapter 112 is an example of the "first duct". Also, the second adapter 114 may be configured to be directly insertable into the second cover 70 at the second connection portion 108. In this case, the second adapter 114 is an example of the "second duct".

[0101] The dust collection hose or the connection hose 116 according to one embodiment may be configured to be directly insertable into the first cover 68 at the first connection portion 106. In this case, the dust collection hose or the connection hose 116 is an example of the "first duct". Also, the dust collection hose or the connection hose 116 may be configured to be directly insertable into the second cover 70 at the second connection portion 108. In this case, the dust collection hose or the connection hose 116 is an example of the "second duct".

Explanation of Reference Numerals

[0102] 1: Workpiece 2: Power tool 4: Tip tool 6: Housing 20: Motor 28: Power transmission mechanism 34: Holding portion 46: Cover unit 48: Mounting member 52: Cover 54: First duct 56: Second Duct 68: First Cover 70: Second Cover 72: First Cover Body 74, 76: First Support Portion 78: First Rotating Shaft 80: First Upper Wall Portion 82: First Side Wall Portion 86: Second Cover Body 88, 90: Second Support Portion 92: Second Rotating Shaft 94: Second Upper Wall Portion 96: Second Side Wall Portion 98: First Space 100, 102: Biasing Member 106: First Connection Portion 108: Second Connection Portion 112: First Adapter 114: Second Adapter 116: Connecting Hose AX: Rotation Axis B: Battery Pack

Claims

1. A motor, A power transmission mechanism connected to the motor, A housing that houses the motor and the power transmission mechanism, A holding part connected to the power transmission mechanism, A tip tool that is held by the holding part and is rotatable around a rotation axis, And a cover unit, The cover unit includes A cover that covers at least a part of the tip tool, At a first connection part, a first duct connected to the cover, And at a second connection part different from the first connection part, a second duct connected to the cover, The cover includes A first cover to which the first duct is connected, A second cover to which the second duct is connected, The first cover is rotatable around a first rotation shaft with respect to the housing, The first cover includes a first upper wall part that covers a part of the upper surface of the tip tool and a first side wall part that covers a part of the side surface of the tip tool, The second cover is rotatable around a second rotation shaft with respect to the housing, The second cover includes a second upper wall part that covers a part of the upper surface of the tip tool and a second side wall part that covers a part of the side surface of the tip tool, The first rotation shaft and the second rotation shaft are substantially orthogonal to the rotation axis, The first cover is relatively rotatable with respect to the second cover, The first cover and the second cover are configured to move such that when a corner part of a workpiece is inserted between the first cover and the second cover, the corner part of the workpiece abuts against the tip tool and the outer surface of the workpiece abuts against the first cover and the second cover, An electric tool.

2. The electric power tool according to claim 1, wherein the first rotating shaft is arranged on the same straight line as the second rotating shaft.

3. The electric power tool according to claim 1 or 2, wherein the cover unit further includes a biasing member that biases the first cover with respect to the second cover in a direction of decreasing the angle between the first cover and the second cover on the tip tool side.

4. The electric power tool according to any one of claims 1 to 3, wherein the cover is rotatably supported with respect to the housing around the rotation axis of the tip tool.

5. The electric power tool according to any one of claims 1 to 4, wherein the position of the first connection portion is substantially equal to a position obtained by rotating the second connection portion 180 degrees around the rotation axis.

6. The electric power tool according to any one of claims 1 to 5, wherein the first connection portion and the second connection portion are arranged at positions farther from the rotation axis than the tip tool.

7. The electric power tool according to any one of claims 1 to 6, further comprising a battery pack that is detachably attached to the housing and supplies power to the motor.

8. A cover unit used for an electric power tool including a motor, a power transmission mechanism connected to the motor, a housing that houses the motor and the power transmission mechanism, a holding portion connected to the power transmission mechanism, and a tip tool held by the holding portion and rotatable around a rotation axis, a cover that covers at least a part of the tip tool, a first duct connected to the cover at a first connection portion, a second duct connected to the cover at a second connection portion different from the first connection portion, and the cover is A first cover to which the first duct is connected, A second cover to which the second duct is connected, and the first cover is rotatable about a first rotation shaft with respect to the housing, the first cover includes a first upper wall portion that covers a part of the upper surface of the tip tool and a first side wall portion that covers a part of the side surface of the tip tool, the second cover is rotatable about a second rotation shaft with respect to the housing, the second cover includes a second upper wall portion that covers a part of the upper surface of the tip tool and a second side wall portion that covers a part of the side surface of the tip tool, the first rotation shaft and the second rotation shaft are substantially orthogonal to the rotation axis, and the first cover is rotatable relative to the second cover, the first cover and the second cover are configured to move such that when a corner portion of a workpiece is inserted between the first cover and the second cover, the corner portion of the workpiece abuts against the tip tool and the outer surface of the workpiece abuts against the first cover and the second cover, A cover unit.

9. The cover unit according to claim 8, wherein the first rotation shaft is arranged on the same straight line as the second rotation shaft.

Images