JP2003191180A - Electric tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric tool having a rational constitution facilitating exchange of a brush. <P>SOLUTION: An angle drill (electric tool) is provided with a housing 20 and a cover 3, the housing 20 is formed with an opening window 23 for mounting a brush 42 for a motor, and the cover 3 has such a structure as closing the opening window 23. A plurality of covers 3 are provided corresponding to the number of the brushe 42 and, at least, two covers 3 are attached to the housing 20 by a single cover fitting member 10. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool of a type in which a motor of a power tool has a brush.

[0002]

2. Description of the Related Art Motor brushes are consumable parts and must be replaced. Therefore, in the conventional electric tool, as a structure for replacing the brush, an opening window for brush installation is provided in the housing, and a cover for closing the opening window is detachably attached to the housing.

[0003]

[Patent Document 1] Japanese Patent Laid-Open No. 6-233499

[Patent Document 2] Japanese Patent Laid-Open No. 2000-116072

[0004]

However, since a plurality of brushes are provided for one motor, the above-mentioned cover is
A plurality of brushes were provided corresponding to the number of each brush, and each brush was separately attached to the housing. Therefore, in order to replace the brush, it is necessary to remove and attach each cover separately, which is troublesome. An electric power tool having a structure different from the above is also known. For example, the cover is big,
There is known an electric power tool having a structure capable of covering a plurality of opening windows with the cover. However, this cover has a problem that it is necessary to make the cover into a complicated shape in consideration of the shape of the housing and to increase the weight of the entire electric tool. Therefore, in view of the above problems, it is an object of the present invention to provide an electric power tool having a rational configuration in which the brush can be easily replaced without enlarging the shape of the cover.

[0005]

In order to solve the above-mentioned problems, the present invention is characterized in that it is an electric power tool having the construction as described in each of the above claims. According to the invention described in claim 1, the power tool includes a housing and a cover,
An opening window for mounting the brush of the motor is formed in the housing, and the cover is structured to close the opening window. A plurality of the covers are provided corresponding to the number of brushes, and at least two covers are attached to the housing by one cover attaching member. That is, by attaching one cover attaching member, a plurality of (at least two) covers are attached to the housing, and by removing one cover attaching member, the plurality of covers are detached from the housing. is there.

Therefore, by removing one cover mounting member, a plurality of covers can be removed, and a plurality of opening windows for mounting brushes are opened. This makes the plurality of brushes replaceable. After replacing the brushes, a plurality of covers can be mounted on the housing by mounting one cover mounting member, and the plurality of opening windows can be closed. Therefore, it is possible to easily attach and detach the plurality of covers, and thus it is possible to easily replace the brush.

The cover closes an opening window formed in the housing, and a plurality of covers are provided. Therefore, the cover can have a shape substantially corresponding to the opening window, and the shape can be made relatively small. Therefore, the cover has a high degree of freedom in design, and can be shaped to comfortably close the opening window, or can be made lightweight by reducing the volume. It should be noted that a structure in which a plurality of covers are mounted by one cover mounting member may be set in multiple, or a cover or a cover mounting member having a different structure may be appropriately combined.

According to a second aspect of the present invention, in the electric power tool according to the first aspect, the housing is divided by the housing constituent members, and the housing constituent members are fixed to each other. It has a plurality of fixing members. At least one of the fixing members also serves as a cover mounting member. That is, the cover mounting member is configured by the housing fixing member, and is configured by using the existing fixing member without providing new parts. Therefore, the electric power tool has a configuration with a small number of parts, and it is possible to reduce the cost of parts or the number of assembling steps. Note that the number of cover mounting members is not limited to one, and there may be a plurality of cover mounting members, and in that case, each cover mounting member may use one of the fixing members.

According to a third aspect of the present invention, in the electric power tool according to the first or second aspect, at least one cover has a closed position in which the opening window is closed and an opening in which the opening window is open. It is supported on the housing side so as to be movable to the position and fixed to the closed position by the cover mounting member. That is, the cover is supported on the housing side even when the cover mounting member is removed, and can move to the open position in the supported state. Therefore, the brush can be replaced without dropping the cover from the housing side. Therefore, the cover can be prevented from being lost, and the brush can be easily replaced. The following structures are examples of the structure in which the cover is movably supported on the housing side. For example, the cover is rotatably supported on the housing side, the cover is slidably supported on the housing side, or the cover is foldable structure, and the cover is foldable to open the closed position. It is a structure that moves to the position.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) An angle drill 1 which is an embodiment of the present invention will be described below with reference to FIGS. The angle drill 1 corresponds to the power tool of the present invention. As shown in FIG. 1, the angle drill 1 includes a power supply unit 14, a motor unit 15, and an actuator unit 16 from the left side of FIG. Each of these units has a housing 2
0, 21, 16a are provided, and these form the housing of the angle drill 1. The housing 20 corresponds to the "housing" of the present invention, and the housing 21 is a motor housing.

The motor unit 15 has a motor 4 in a housing 21 as shown in FIG. The motor 4 is a commutator type motor, and is, for example, a DC commutator motor or an AC commutator motor. The motor 4 is
As shown in FIG. 1, it is configured by including a magnetic field portion 40 that creates a magnetic flux, a rotor portion 41 that generates torque, and a commutator 48 that rectifies the current to the rotor portion 41.

The magnetic field portion 40 is a stator fixed to the housing 21 side as shown in FIG.
They are arranged at a predetermined interval along the circumference of one axis. The plurality of magnetic field portions 40 form a plurality of pairs (for example, two pairs) arranged at positions facing each other with the rotor portion 41 interposed therebetween. The magnetic field portion 40 may be an electromagnet having a winding attached to soft iron, or may be a permanent magnet or the like. Further, as shown in FIG. 1, the rotor portion 41 rotates between the magnetic field portions 40 about the longitudinal axis. A support shaft 46 and an output shaft 47 are provided at both ends of the rotation shaft of the rotor portion 41, and the support shaft 46 and the output shaft 47 are rotatably attached to the housing 21 via bearings. Further, as shown in FIG. 1, a part of the housing 21 is formed on one end side of the housing 21, and the rotor portion 41 is provided.
A housing cap 21a that supports the support shaft 46 is provided.

The commutator 48 is configured to rotate together with the rotor portion 41 as shown in FIG. 1. The commutator 48 has conductive commutator pieces arranged around the shaft at equal intervals, and these commutator pieces. And an insulating material that insulates the space (see FIG. 2). The brush 42 is in contact with the commutator 48 as shown in FIG. The brush 42, which supplies a current to the commutator 48 side, is fixed to the housing cap 21a as shown in FIG. Therefore, the commutator 48 rotates together with the rotor portion 41, and the brush 4
An electric current is supplied to the commutator 48 in a state in which 2 is fixed to the housing cap 21a side. That is, the commutator 48 rectifies the current.

As shown in FIG. 2, the brush 42 is constructed as a brush unit 45 which can be attached to and detached from the housing cap 21a. As shown in FIGS. 2 and 3, the brush unit 45 includes a sheet metal brush holder 43 formed in a substantially tubular shape, a rectangular parallelepiped brush 42 slidably inserted therein, and a brush 42 commutator. And a coil spring for biasing to the 48 side. A brush cap 44 that supports the brush 42 and the coil spring is attached to one end of the brush holder 43. As shown in FIGS. 2 and 3, the housing cap 21a side is provided with a brush insertion hole 21b formed in a substantially cylindrical shape into which the brush holder 43 can be slid. Therefore, the brush unit 45 is configured to be detachably attached to the housing 21, and the brush 42 can be brought into contact with the commutator 48 in the attached state. The brush 42 is a carbon brush made of carbon.

The power supply unit 14 is mainly composed of a power supply circuit 7 and a housing 20 (rear housing) for protecting the power supply circuit 7, as shown in FIG. Power supply circuit 7
Is fixed to the housing cap 21a as shown in FIG. 1, whereby the power supply circuit 7 is connected to the motor unit 15. A power supply cord 8 is electrically connected to the power supply circuit 7 as shown in FIG. 1 to supply power. Then, the power supply circuit 7 adjusts the supplied power, supplies the adjusted power to the motor 4, and adjusts the rotation speed of the motor 4. For example, as shown in FIG. 1, a trigger 24 is rotatably provided on the housing 20, and the rotation speed of the motor 4 can be adjusted according to the pushing amount of the trigger 24, or the load state of the motor 4 is detected. It is possible to adjust the rotation speed of the motor 4 by a signal from the sensor.

The housing 20 is divided into housing constituent members 20a and 20b as shown in FIG. In other words, the housing 20 includes a plurality of (for example, two) housing constituent members 20a divided in the longitudinal direction,
20b, or housing component members 20a and 20b having a half-split (two-split) configuration. The housing constituent members 20a and 20b are fixed to each other by a plurality of fixing members 10 to 13 as shown in FIG. Further, the housing constituent members 20a and 20b
Are fixed so as to cover a part of the housing 21 of the motor unit 15 as shown in FIG. 1, and the housing 20 is attached to the housing 21.
Further, as shown in FIG. 3, the housing constituent members 20a and 20b are provided with opening windows 23 for brush installation.
The brush unit 45 is exposed by the opening window 23.

The housing constituent members 20a, 20b
1, a cover 3 for closing the opening window 23 is attached to each of them. Opening window 23 and cover 3
Are provided in a number corresponding to the number of brushes 42, and for example, two each are provided as shown in FIG. Further, the opening window 23 and the cover 3 are arranged above the brush 42, and are arranged substantially opposite to each other with the axis center interposed therebetween. Therefore, the cover 3 is removed from the housing 20 as shown in FIG.
Is exposed, and the brush unit 45 (brush 42) is made removable (wearable). As shown in FIG. 1, the cover 3 is attached to the housing 20 to cover the opening window 23, thereby preventing dust from entering the housing 20 through the opening window 23.

The cover 3 has a fixing member 1 as shown in FIG.
It is attached by a fixing member 10 which is one of 0 to 13, and the fixing member 10 also serves as a cover attaching member. That is, the fixing member 10 corresponds to both the "fixing member" and the "cover mounting member" of the present invention. As shown in FIG. 2, the fixing member 10 includes a head portion 10a and a leg portion 1a.
0b and a nut portion 10c to which the leg portion 10b is screwed.

On the other hand, housing constituent members 20a, 20b
As shown in FIG. 2, each of the recesses 20d has a recess 20d, and an insert hole 20c for inserting the leg portion 10b of the fixing member 10 is provided on the bottom surface of the recess 20d. Therefore, in the fixing member 10, as shown in FIG. 2, the head portion 10a is installed in the concave portion 20d on the housing constituent member 20b side, and the nut portion 10c is arranged in the housing constituent member 20.
It is attached to the housing constituent members 20a and 20b while being installed in the concave portion 20d on the a side. As a result, the housing constituent member 20b is supported via the nut portion 10c, and the housing constituent member 20a is supported via the head portion 10a.

Further, the distance between the nut portion 10c and the head portion 10a can be adjusted by the screwing amount of the leg portion 10b with the nut portion 10c. By adjusting this distance, the housing constituent members 20a and 20b are separated from each other. It has a structure where the fixing strength can be adjusted. Further, since the head portion 10a and the nut portion 10c of the fixing member 10 are respectively disposed in the recessed portion 20d, they can be attached without protruding from the housing constituent members 20a and 20b. Therefore, the design of the housing 20 is improved and the ease of gripping is improved.

As shown in FIG. 3, the cover 3 has a cover body 30 for closing the opening window 23 and a cover body 30.
And an extension portion 31 extending from the main part. As shown in FIG. 3, the extension portion 31 has the leg portion 10 of the fixing member 10.
It has a mounting hole 31a for inserting b. In addition, the extension portion 31
2 is formed in a concave shape as shown in FIG. 2, and has a shape following the concave portion 20d formed in the housing constituting members 20a and 20b.

Therefore, the cover 3 is installed in a state of following the shapes of the housing constituting members 20a and 20b as shown in FIG. When the fixing member 10 is attached with the cover 3 installed, the head portion 10a and the nut portion 10c of the fixing member 10 are placed in the recesses of the extending portion 31, respectively, and the fixing member 10 is formed into the housing constituent members 20a and 20b.
(Cover 3) does not protrude. Therefore, the cover 3 installed on the housing component 20b is
The housing constituent member 20 is supported via the head portion 10a.
The cover 3 on the side a is supported by the nut portion 10c.

That is, the plurality of covers 3 are attached to the housing constituent members 20a and 20b (housing 20) by being supported by one fixing member 10 as shown in FIG. Therefore, the fixing member 10
Is a plurality of housing constituent members 20 as shown in FIG.
At the same time as mounting a and 20b on each other, a plurality of covers 3 are simultaneously mounted on the housing constituent members 20a and 20b.

Further, as shown in FIG. 2, the housing constituent members 20a and 20b are formed with an overhanging portion 20e which overhangs from the wall surface forming the opening window 23 toward the center of the opening.
The cover body portion 30 is installed on these overhanging portions 20e. Therefore, the contact area between the cover 3 and the housing 20 is wide, and the structure is such that dust and the like are less likely to enter through the gap. Further, as shown in FIG. 1, the cover main body portion 30 and the opening window 23 can be changed by the operator using the brush unit 45.
Has a horizontally long shape so that it can be easily held (the width on the axial side is longer than the width on the vertical side). Further, the extending portion 31 extends downward from the lower rear side of the cover body portion 30. Therefore, the mounting position of the fixing member 10 becomes far from the commutator 48, which reduces the possibility of breakage of the commutator 48.

Further, the housing cap 21a has a structure shown in FIG.
As shown in, a through hole 21c penetrating in the thickness direction is provided. As shown in FIG. 2, the housing cap 21a includes housing constituent members 20a, 2 from both sides thereof.
0b is installed, and the covers 3 are installed from both sides thereof. The fixing member 10 is installed so as to penetrate the through hole 21c. Therefore, the fixing member 10
Attaches a plurality of housing constituent members 20a and 20b to the housing 21, and also attaches a plurality of covers 3 to the housing 21.

The fixing member 13 is also omitted in the drawing (see FIG. 1), but the housing constituent members 20a, 2
0b is fixed in a state of being sandwiched from both sides of the housing cap 21a. And the leg part of the fixing member 13 is
It is arranged in a through hole provided in the housing cap 21a. Although not shown in the drawing (see FIG. 1), the fixing members 11 and 12 are attached by penetrating through a through hole provided in the base of the power supply circuit 7. Therefore, the fixing members 11 and 12 are connected to the housing constituent members 20a and 20.
At the same time as fixing b to each other, the power supply circuit 7 is positioned on the housing constituent members 20a and 20b.

As shown in FIG. 2, the fixing member 10 is inserted into the housing 20 substantially parallel to the inserting direction of the brush unit 45. The other fixing members 11 to 13 are also inserted in the housing 20 substantially in parallel with the fixing member 10, although not shown in the drawing. Therefore, the fixing member 10
The arrays of # 13 to # 13 have a good appearance as shown in FIG. In the housing 20, the plurality of recesses 20d into which the fixing members 10 to 13 are inserted are formed in substantially the same direction. Therefore, the housing 20 has a structure that can be easily molded. Further, the fixing member 10
Since the driver 13 and the like can be installed in the same direction in the detaching / attaching process, the detaching / attaching process 13 can be easily performed. The extending portions 31 of the cover 3 are shaped so as to extend in the same direction (downward) as shown in FIG. Therefore, the line connecting the extending portions 31 is at a position avoiding the axial center, and is at a position avoiding the commutator 48. Therefore, the fixing member 10 for mounting the extending portions 31 to each other is attached while avoiding the commutator 48.

Further, the nut portion 10c of the fixing member 10 is press-fitted (mounted) in a recess provided in the cover 3 as shown in FIG. Therefore, the nut portion 10c does not need to be installed in the recess when mounting the fixing member 10. Further, when the fixing member 10 is mounted, it is not necessary to hold the nut portion 10c so as not to rotate, and when the fixing member 10 is removed, it is not necessary to store the nut portion 10c so as not to lose it. The nut portions of the other fixing members 11 to 13 are not shown in the drawing (see FIG. 2), but are press-fitted into the recess 20d of the housing constituent member 20a and mounted on the housing constituent member 20a side. . Then, the heads of the fixing members 11 to 13 are placed in contact with the recesses 20d of the housing constituent member 20b.

The actuator unit 16 includes the motor 4
It is configured to include a plurality of gears that transmit the output torque of 1 and a housing 16a that protects these gears. The actuator unit 16 also includes a chuck 16b to which a driver bit is attached.
b is configured to rotate in a direction in which the output torque of the motor 4 is converted by approximately 90 degrees by a gear or the like.

The angle drill 1 is constructed as described above. That is, the angle drill 1 is plural (for example, two).
The cover 3 is provided with a plurality of covers 3.
Mounted on the side. Therefore, one fixing member 10
The plurality of covers 3 can be simultaneously removed by removing the housing 20.
The cover 3 can be detached from the side and the plurality of covers 3 can be attached to the housing 20 side at the same time.
As a result, the plurality of covers 3 can be easily attached and detached, and the brush unit 45 (brush 42) can be easily attached and detached.

The cover 3 can be formed in a shape that is only one size larger than the opening window 23, and can be formed in a relatively small shape. Therefore, the cover 3 can have a complicated shape or a structure that can be easily handled, that is, a structure having a high degree of freedom in design. The members for attaching the cover 3 are fixed members 10 to 13
One of them (fixing member 10) is used (also used). Therefore, the angle drill 1 has a configuration in which the number of parts is small, and it is possible to reduce the cost of parts or the number of assembling steps.

The present invention is not limited to the above embodiment and may have the following forms. (1) That is, in the present embodiment, the two covers are configured to be attached to the housing by one cover attachment member (fixing member), but in the case where the cover has three or more covers, The structure may be such that these are attached by one cover attaching member. For example, the cover mounting member includes a support portion that supports the cover, and a connection portion that connects the plurality of support portions,
By rotating one support part, the other support part is rotated via the connecting part, whereby the plurality of support parts are respectively attached to and detached from the housing. Examples of the structure of this connecting portion include a structure in which a plurality of gears are combined, or a link structure having a hook joint. (2) Further, in the present embodiment, the plurality of covers are detachably attached to the housing by one fixing member (cover attaching member). However, a plurality of covers are rotatably attached to the housing, and the electric tool has a configuration capable of opening and closing the opening window of the housing by rotating the covers, wherein at least two covers are The electric tool may have a structure such that each of the housings cannot be rotated by one fixing member. According to this structure, the plurality of covers can be rotated / unrotatable by one fixing member. Therefore, even with this configuration, it is possible to easily replace the plurality of brushes. (3) In addition, although an angle drill is described in the present embodiment, any electric tool provided with an electric motor may be used as long as the motor has a brush. For example, a driver, a cutter, a cutting machine, A rotating tool such as a grinder or a circular saw may be used.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. The second embodiment is an angle drill formed almost in the same manner as the first embodiment.
Therefore, while using the same numbers for the same parts as in the first embodiment, the description of the parts different from the first embodiment will be given below. The power supply unit 14 of the second embodiment has a housing 50 that protects the power supply circuit 7, as shown in FIG. The housing 50 is divided into housing components 50a and 50b as shown in FIG. The housing constituent members 50a and 50b are fixed members 6
They are fixed to each other by 0 to 63 (see FIGS. 4 and 7).

Further, the housing 50 has an opening window 51 for mounting the brush unit (45) as shown in FIG. A cover 70 for closing the opening window 51 is attached to the housing 50 side. The cover 70 has a horizontally long shape extending in the axial direction of the housing 50. Then, as shown in FIG. 9, one end side (power cord 8 side) of the cover 70 is rotatably supported with respect to the housing 50 side. Therefore, the cover 70 moves (rotates) between the closed position where the opening window 51 is closed and the open position where the opening window 51 is opened. The opening window 51 and the cover 7
0 (80) is the brush unit 4 as shown in FIGS.
A plurality of brushes are provided corresponding to the number of 5 (brushes), for example, two each.

The covers 70 and 80 have plate-shaped cover main bodies 74 and 84 as shown in FIG. A shaft structure serving as a rotation shaft is provided near one end of each of the cover main bodies 74 and 84. This shaft structure has a cover body 74, 8
Ribs 7 extending from the back side of the housing 4 to the inside of the housing 50
1 and 81, and substantially cylindrical rotation shafts 72 and 82 provided at the tips of the ribs 71 and 81 (see FIG. 6). Therefore, the shaft structure is formed in the housing 50 and does not impair the aesthetics of the angle drill.

On the other hand, in the housing 50, as shown in FIG. 5, a holder 56 for supporting various electric parts (power supply circuit 7 such as cabtire cord, switch, circuit board) is provided. Then, cover 70 on this holder 56,
A plurality of support portions 55 for rotatably supporting the 80 are integrally provided. The support portion 55 is the housing 50.
From the inner side of the cover toward the opening window 51 side, and the cover 7
Rotating shafts 72 and 82 of 0 and 80 are rotatably supported. Therefore, the covers 70 and 80 are rotatably attached to the holder 56, and are rotatably (hinge-like) connected to the housing 50 side via the holder 56.

The covers 70 and 80 are fixed in the closed position by one of the fixing members 60 to 63, as shown in FIG. Ie cover 7
0 and 80 have fixing portions 73 and 83 to which the fixing member 60 is attached as shown in FIG. 7. Fixed part 73 of cover 70
Has a through hole into which the leg portion 60b of the fixing member 60 is fitted, and the through hole has a first diameter portion 73a and a second diameter portion 73b. Therefore, the head portion 60 a of the fixing member 60 is supported in the through hole of the fixing portion 73.

The fixed portion 83 of the cover 80 extends from the back surface of the cover main body portion 84 toward the inside of the housing 50. A concave portion 83a is provided at the center of the shaft, and the tip end of the leg portion 60b of the fixing member 60 is screwed into the wall surface of the concave portion 83a. Therefore, on the surface side of the cover 80,
Since the recess is not formed, the aesthetic appearance of the cover 80 is improved. Further, unlike the first embodiment, the nut portion 10c (see FIG. 2) is unnecessary, and the number of parts is small.

As shown in FIG. 5, the angle drill includes a housing 21 for protecting the motor and a housing 2 for the housing 21.
1 has a housing cap 21a provided on one end side thereof. As shown in FIG. 7, the housing cap 21a has a support portion 21d protruding between the fixing portions 73 and 83 of the covers 70 and 80. As shown in FIG. 7, the supporting portion 21d has a through hole into which the fixing member 60 is inserted, and has left and right ends having recesses into which the fixing portions 73 and 83 of the covers 70 and 80 are fitted.

In order to prevent the covers 70 and 80 from falling into the housing 50 around the opening window 51 of the housing 50, as shown in FIGS. 6 to 8, from the opening end of the opening window 51 to the opening center side. An overhanging piece 52 that overhangs is provided. Therefore, the two covers 70, 80 are brought close to each other by tightening the fixing member 60, and the movement in the tightening direction is caused by the protrusion 52 and the housing cap 2.
It is regulated by 1a. Thus covers 70, 80
Are fixed in the closed position by one fixing member 60. The housing constituent members 50a and 50b are also fixed to each other by the fixing member 60. That is, the fixing member 60 fixes the covers 70 and 80 to the closed position and fixes the housing constituent members 50a and 50b to each other. The fixing member 60 is a member that corresponds to both the “fixing member” and the “cover mounting member” of the present invention.

Further, the housing constituent members 50a and 50b
Are fixed to each other by a fixing member 63 as shown in FIG. That is, the housing constituent members 50a and 50b
Has fixing portions 53 and 54 to which the fixing member 63 is attached. The fixing portion 54 has a through hole into which the leg portion 63b of the fixing member 63 is fitted, and the fixing member 63 is supported in the through hole by the first diameter portion 54a and the second diameter portion 54b of the through hole.
Further, the fixing portion 53 projects from the back surface of the cover main body portion 84, and the tip end of the fixing member 63 is screwed into the recess 53a at the center of the shaft. Further, similarly to the fixing member 63, the housing constituent members 50a and 50b are fixed to each other by the fixing members 62 and 61.

The second embodiment is formed as described above. Therefore, the covers 70 and 80 are supported on the housing 50 side even when the fixing member 60 (cover mounting member) is removed, and can be moved to the open position while being supported. Therefore, the brush can be replaced without dropping the covers 70 and 80 from the housing 50 side. Therefore, it is possible to prevent the covers 70 and 80 from being lost, and it is possible to easily replace the brush. Further, the covers 70 and 80 can be moved from the open position to the closed position without dropping from the housing 50 side. Then, the covers 70 and 80 are fixed at the closed position by the fixing member 60 while being supported on the housing 50 side. Therefore, the covers 70 and 80 can be easily fixed to the closed position.

(Other Embodiments) The present invention is not limited to the above embodiments and may have the following forms. (1) That is, in the second embodiment, the cover is rotatably supported on the housing side. However, the structure may be such that the cover is slidably attached to the housing side, and by sliding, the cover moves to a closed position that covers the opening window of the housing and an opening position that opens the opening window. Alternatively, the cover may be a structure that can be transformed by a bellows structure, a folding structure, or the like, and the cover may be moved to the closed position or the open position by the movement by the transformation. (2) Further, in the second embodiment and the above-mentioned (1),
All of the plurality of covers were rotatably supported with respect to the housing side. However, one of the plurality of covers may be rotatably supported with respect to the housing side. (3) Further, the cover according to the second embodiment is rotatably attached to the housing side via the holder. However, the cover may be directly rotatably attached to the housing.

[0044]

According to the electric power tool of the present invention, it is possible to provide an electric power tool having a rational structure in which the brush can be easily replaced without enlarging the shape of the cover.

[Brief description of drawings]

FIG. 1 is a front view of an angle drill.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 and is a view showing a mounted state of the cover.

FIG. 3 is a front view of the angle drill with the cover removed.

FIG. 4 is a front view of the angle drill according to the second embodiment.

FIG. 5 is a partial cross-sectional view from the top surface of the angle drill according to the second embodiment.

FIG. 6 is a sectional view taken along line BB of FIG.

7 is a cross-sectional view taken along the line CC of FIG.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a top view of the angle drill according to the second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Angle drill (electric power tool) 3, 70, 80 ... Cover 4 ... Motor 7 ... Power supply circuits 10-13, 60-63 ... Fixing member (10, 60 ... Cover mounting member) 14 ... Power supply unit 15 ... Motor unit 16 ... actuator unit 16a, 20, 21, 50 ... housing 20a, 20b, 50a, 50b ... housing component 21a ... housing cap 21b ... brush insertion hole 23, 51 ... opening window 24 ... trigger 30, 74, 84 ... cover body 31 ... Extension part 42 ... Brush 45 ... Brush unit 48 ... Commutator

Claims (3)

[Claims] 1. A power tool, comprising a cover provided in a housing of the power tool for closing an opening window for mounting a brush of a motor, wherein a plurality of the covers are provided corresponding to the number of the brushes. In addition, at least two covers are attached to the housing by one cover attachment member. 2. The electric power tool according to claim 1, wherein the housing is divided into housing component members, and has a plurality of fixing members for fixing the housing component members to each other. At least one of the members is configured to also serve as a cover mounting member. 3. The electric power tool according to claim 1, wherein at least one cover is movably supported on a housing side between a closed position where the opening window is closed and an opening position where the opening window is opened. The electric power tool has a structure in which it is fixed at the closed position by a cover mounting member.