WO2017064901A1

WO2017064901A1 - Electric tool

Info

Publication number: WO2017064901A1
Application number: PCT/JP2016/072650
Authority: WO
Inventors: 高弘川上; 彰良水谷
Original assignee: 株式会社マキタ
Priority date: 2015-10-15
Filing date: 2016-08-02
Publication date: 2017-04-20
Also published as: JP2017074726A; JP6621641B2

Abstract

A multi-tool (10) cuts a material to be worked, by reciprocating a cut saw (90) at a predetermined angle. The multi-tool (10) has: a tool body (11); an output shaft (31) protruding from the tool body (11); and a motor provided within the tool body (11) in order to cut a material to be worked, by reciprocating the cut saw (90) at a predetermined angle, the cut saw (90) being mounted to the output shaft (31). The multi-tool (10) is further provided with: a tool holder (32) which is provided at the lower end of the output shaft (31) and to which the cut saw (90) is mounted; and a shaft cover (42) which is mounted to the tool body (11), covers the outer periphery of the tool holder (32), and is open to the front side, which is the tooth side of the cut saw (90). The shaft cover (42) has: a semicircular lower wall (45) having a semicircular shape in a plan view and located below and facing the tool holder (32); and a semicircular upper wall (44) having a semicircular shape in a plan view and located above the tool holder (32) so as to face the semicircular lower wall (45). The shaft cover (42) further has a circular arc wall (46) for connecting the circular arc edges of the semicircular lower wall (45) and the semicircular upper wall (44) and disposed facing the grip side of the tool body (11).

Description

Electric tool

The present invention relates to an electric tool for cutting a workpiece by reciprocating a saw blade member attached to an output shaft within a predetermined angle range.

An electric tool called a multi-tool is known. This electric tool incorporates a motor as a drive source. Using the output of the motor, the output shaft is driven to reciprocate at high speed in a small angle range. For example, a sanding pad for grinding a machined surface of wood is attached to the output shaft. In the electric power tool disclosed in Japanese Patent Publication No. 7-77707, a discharge connecting part is attached to the discharge hood in order to remove generated dust.

鋸 A saw blade member called a cut or round saw may be attached to the output shaft instead of a sanding pad. The workpiece is cut by the reciprocating motion of the blade edge of the saw blade member.

The above-described electric tool may be used when cutting the house ceiling. In this case, since the workpiece is cut over the operator's head, the cutting powder generated by the cutting falls from the overhead to the operator. Therefore, it is difficult for the operator to perform the cutting work. Therefore, there has been a need for an electric tool that is easy to perform cutting work by suppressing the cutting powder generated by cutting from falling on the operator.

According to one feature of the invention, the power tool reciprocates the saw blade member at a predetermined angle to cut the workpiece. The electric tool includes a tool body, an output shaft protruding from the tool body, and a motor provided in the tool body for reciprocating a saw blade member attached to the output shaft at a predetermined angle to cut a workpiece. Have. The electric tool is further provided with a mounting portion provided at the lower end of the output shaft to which the saw blade member is attached, and a first portion that is attached to the tool body and covers the outer periphery of the mounting portion and opens the front side that is the blade tip side of the saw blade member. Has a cover. The first cover has a lower wall part that is semicircular in plan view and faces the attachment part below the attachment part, and an upper wall part that is semicircular in plan view and faces the lower wall part above the attachment part. The first cover further includes a peripheral wall portion that connects the ends of the arcs of the lower wall portion and the upper wall portion and that faces the handle side of the tool body.

Therefore, since the peripheral wall portion is arranged facing the handle side of the tool body, the cutting powder generated by cutting is blocked by the peripheral wall portion even if it comes toward the handle side. Thereby, it is suppressed that the cutting powder produced by cutting falls on an operator, and cutting workability | operativity is improved.

According to another feature, the first cover is supported by the tool body so as to be displaceable in the arc direction. In the first cover, a plurality of intake openings communicating with the inside and outside of the first cover are arranged in an arc direction, and the first cover is displaced to replace one of the plurality of intake openings. The other one is located at a location corresponding to the intake duct and connected to the intake duct.

Therefore, the blade edge of the saw blade member can be rotationally displaced with respect to the tool body, and the first cover can also be rotationally displaced accordingly. Since another one of the intake openings is located at a location corresponding to the intake duct and the intake duct can be connected to the other one, the intake duct can be easily connected to the first cover. Therefore, even when the blade edge of the saw blade member is rotationally displaced, the cutting powder can be sucked satisfactorily and cutting workability can be improved.

According to other features, the intake duct is supported by the housing of the tool body. Therefore, it is possible to improve the cutting workability by stabilizing the intake duct that sucks the cutting powder.

According to another feature, the upper wall of the first cover includes an intake opening. Therefore, the connection position of the intake duct can be set to the upper side with respect to the first cover. When the intake duct is positioned above the first cover, the vertical length of the intake duct can be shortened. Therefore, the configuration of the power tool can be made compact, and the operability of the power tool can be improved.

According to another feature, the second cover has a cylindrical shape that is attached to the front side of the first cover and extends in an opening direction from the attachment portion toward the blade edge of the saw blade member. Therefore, the second cover can cover the periphery of the blade edge of the saw blade member. Thus, the cutting powder can be sucked while suppressing the scattering of the cutting powder generated from the blade edge of the saw blade member.

According to another feature, the second cover is configured to be extendable and contractible in the direction from the blade edge of the saw blade member to the mounting portion. Therefore, the second cover can cover the saw blade member close to or beyond the blade edge. For example, when the blade edge of the saw blade member is positioned in the vicinity of the workpiece, or when inserted into the workpiece, the second cover can hit the workpiece and shrink. Therefore, the saw blade member can cut the workpiece without being obstructed by the second cover. Therefore, many parts of the saw blade member can be covered with the second cover.

It is a perspective view of a multi tool. It is a left view of a multi tool. FIG. 3 is a cross-sectional view of the multitool taken along line III-III in FIG. 1. FIG. 4 is a cross-sectional view of the multitool taken along line IV-IV in FIG. 1. It is a perspective view of the multitool from which the member cover is removed. It is a perspective view of a shaft cover. It is a partial perspective view of the multi-tool with the shaft cover removed and the saw blade member attached. It is a perspective view of the multi tool where the member cover was shrunk and the blade edge was exposed. It is a left view of the multi tool of FIG. It is a top view of the multi tool which rotated the dust collecting cover to the left side. It is a left view of the multitool which has another intake duct. It is the perspective view of the multi tool which replaced | exchanged the cut-and-sew for the round saw. It is an expanded view of the other shaft cover.

Embodiments of an electric power tool according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the power tool is, for example, a multi-tool 10. The multitool 10 is used for cutting a gypsum board, used for peeling a P tile, or used for grinding wood. A household AC power source is used as the power source of the multitool 10.

As shown in FIG. 3, the multi-tool 10 has an output shaft 31 that protrudes downward from the tool body 11, and a tool holder 32 is provided at the lower end of the output shaft 31. The tool holder (attachment portion) 32 holds a cut saw (saw blade member) 90 as a tip tool. The multi-tool 10 reciprocates the cutting edge 95 of the cut saw 90 at a high speed within a minute angle range when cutting the workpiece. The cut saw 90 generally includes a mounting portion 91, a long plate portion 93, and a cutting edge 95. The attachment portion 91 is attached to the tool holder 32. The long plate portion 93 sets the length between the attachment portion 91 and the blade edge 95. The long plate portion 93 is a plate shape that extends from the attachment portion 91 to the cutting edge 95 and forms a rectangular shape in a top view. The blade edge 95 is provided with a saw blade. The blade is set to extend in a direction orthogonal to the direction in which the long plate portion 93 extends. For example, the blade edge 95 is straight. The blade edge 95 is located at the tip of the long plate portion 93 and can face the cutting material. The multitool 10 is, for example, TMA009BIM manufactured by Makita Corporation.

As shown in FIG. 5, the multi-tool 10 has a cut-and-saw 90 attached to a tool holder (attachment portion) 32. The tool holder 32 reciprocates together with the output shaft 31 to reciprocate the cutting edge 95 of the cut saw 90. The output shaft 31 reciprocates in a minute angle range such as 3.2 degrees. The output shaft 31 reciprocates at a short cycle or reciprocates at a high speed. Therefore, the blade edge 95 reciprocates so as to vibrate. A saw blade member is detachably attached to the multitool 10. The saw blade member is, for example, a cut saw 90, a round saw 90A having an arcuate cutting edge 95A shown in FIG. 12, a scraper used for paint peeling work, a sanding pad used for grinding work or polishing work, and the like.

As shown in FIG. 3, the multitool 10 generally includes a tool body 11 and a dust suction device 40. The tool main body 11 includes a motor unit 21 and a mechanical unit 25. The motor unit 21 includes a motor 210 and a cooling fan 225 built in the motor housing 22. The motor housing 22 is substantially cylindrical. For this reason, the outer periphery of the motor housing 22 can be easily gripped by hand, and the motor housing 22 functions as a handle portion (handle, grip) 17 of the multitool 10. An operation switch 151 is provided on the front upper side of the motor housing 22. When the operation switch 151 is slid forward, an ON signal is input to the controller 155 inside the motor housing 22. A speed signal is input to the controller 155 from a speed dial 152 provided at the rear of the tool body 11. The controller 155 controls the rotational drive of the motor 210 based on the speed signal and the ON signal.

As shown in FIG. 3, the motor 210 rotates the motor shaft 211 around the axis. The motor shaft 211 is rotatably supported by the motor housing 22 by a rear bearing 221 and a front bearing 222. The motor 210 includes a stator 212 supported by the motor housing 22 and a rotor 213 supported by the motor shaft 211. A coil 214 is wound around the rotor 213. Electricity flows through the coil 214 through the commutator 215. The electricity that flows is controlled by the controller 155. The motor 210 to which electricity is passed drives the motor shaft 211 to rotate. The rotating motor shaft 211 inputs a rotational driving force to the mechanical unit 25 while rotating the cooling fan 225.

As shown in FIG. 3, a cooling fan 225 is attached to the front portion of the motor shaft 211. The cooling fan 225 is a centrifugal fan that rotates integrally with the motor shaft 211. The cooling air generated by the cooling fan 225 cools the motor 210 and the controller 155. As shown in FIG. 1, an air inlet 231 is provided at the rear part of the motor housing 22. An exhaust port 232 is provided in the front portion of the motor housing 22. The intake port 231 and the exhaust port 232 communicate with the inside and outside of the motor housing 22 so as to allow ventilation. A female portion 24 for locking the locking claw portion 87 of the duct holder 85 is provided at the lower portion of the air inlet 231.

The mechanical unit 25 has a mechanical unit built in the mechanical housing 26 as shown in FIG. The mechanical unit has an eccentric shaft portion 271 attached to the front end of the motor shaft 211. The eccentric shaft portion 271 is located on the front side of the front bearing 222. The eccentric shaft portion 271 rotates around the position deviated from the center of the motor shaft 211 by receiving the rotational drive of the motor shaft 211 (eccentric motion). A sphere bearing 273 is attached to the outer periphery of the eccentric shaft portion 271. As shown in FIG. 4, the sphere bearing 273 is a rolling bearing in which the outer ring has a spherical surface. The eccentric motion of the eccentric shaft portion 271 is transmitted to the swing arm 28 via the sphere bearing 273. The swing arm 28 is integrally attached to the output shaft 31. The swing arm 28 includes a swing receiving portion 281 to which the sphere bearing 273 hits, and a swing fulcrum portion 283 attached integrally to the output shaft 31.

As shown in FIG. 4, the swing receiving portion 281 is provided with an appropriate clearance between the sphere bearing 273 in the vertical direction. On the other hand, the swing receiving portion 281 is in close contact with the sphere bearing 273 in the left-right direction. For this reason, the swing receiving portion 281 follows the eccentric motion of the eccentric shaft portion 271 via the sphere bearing 273 while escaping the eccentric motion of the eccentric shaft portion 271 in the vertical direction. As a result, the swing receiving portion 281 reciprocates left and right with the swing fulcrum portion 283 as a fulcrum, and the swing fulcrum portion 283 reciprocates within a predetermined angle range. Since the swing fulcrum part 283 is integrated with the output shaft 31, the output shaft 31 is reciprocally rotated by reciprocating rotation.

As shown in FIG. 3, the output shaft 31 is supported by the mechanical housing 26 via the upper bearing 311 and the lower bearing 312. The upper bearing 311 is a needle bearing, and the lower bearing 312 is a ball bearing. The output shaft 31 extends in the vertical direction perpendicular to the motor shaft 211. A lower portion of the output shaft 31 protrudes outside the mechanical housing 26, and a tool holder 32 is attached to the lower end of the output shaft 31. A cut-and-sew 90 is attached to the output shaft 31 via the tool holder 32. In response to the reciprocating rotation of the output shaft 31, the cutting edge 95 of the cut-and-sew 90 can reciprocate at a minute angle to cut the workpiece. A lower portion of the outer periphery of the mechanical housing 26 is formed as a cylindrical fastened portion 30 as shown in FIG. The fastening portion 48 (see FIG. 6) of the shaft cover 42 is fastened to the fastened portion 30.

As shown in FIGS. 1 and 3, the dust suction device 40 roughly includes a dust suction cover 41 and an intake duct 71. The dust collection cover 41 covers the outer periphery of the output shaft 31 and the outer periphery of the cut saw 90. The dust collection cover 41 includes a shaft cover 42 (first cover) and a member cover 60 (second cover). The shaft cover 42 mainly covers the output shaft 31 and the attachment portion 91 of the cut-and-sew 90. The member cover 60 mainly covers the outer periphery of the cut saw 90. The shaft cover 42 includes a cover main body 43 and a fastening portion 48. The cover body 43 has an internal space structure that is semicircular when viewed from above. The cover body 43 is set so as to cover the outer half of the output shaft 31.

The shaft cover 42 covers the outer periphery of the tool holder 32 by opening the front side that becomes the cutting edge 95 of the cut-and-saw 90. As shown in FIG. 6, the shaft cover 42 includes a semicircular upper wall (upper wall portion) 44, a semicircular lower wall (lower wall portion) 45, and an arc peripheral wall (peripheral wall portion) 46. The semicircular upper wall 44 is semicircular in plan view. The semicircular lower wall 45 also has a semicircular shape in plan view that forms a pair with the semicircular upper wall 44. An arc peripheral wall 46 connects the arc end edge 442 of the semicircular upper wall 44 and the arc end edge 452 of the semicircular lower wall 45. The cover main body 43 of the shaft cover 42 is opened only at the front side, and is closed by the semicircular upper wall 44, the semicircular lower wall 45, and the circular arc peripheral wall 46 in the vertical and horizontal directions.

As shown in FIG. 6, the semicircular upper wall 44 has an upper surface 441, the semicircular lower wall 45 has a lower surface 451, and the circular arc peripheral wall 46 has a side surface 461. An opening 47 is provided on the front surface of the cover main body 43. The opening 47 is a rectangle that extends long in the left-right direction. The opening 47 is opened so that the cut saw 90 can protrude forward. The cover main body 43 is formed integrally with the base body 481 of the fastening portion 48 using resin as a material. The cover main body 43 is formed by integrally combining an upper member 50 and a lower member 55 that are divided vertically. As shown in FIGS. 3 and 6, this uniting is performed by fitting the rear end side fitting portion 57 and the overlapping portion 58 provided on the lower member 55 to the upper member 50.

As shown in FIG. 6, the semicircular upper wall 44 is provided with a fastening portion 48. The fastening portion 48 includes a base body 481 that is integrated with the semicircular upper wall 44, a rotating portion 483 that is separated from at least one end of the semicircular upper wall 44, and a clamp screw 487 that fastens them. One end of the base body 481 is provided with a screw hole 482 through which the clamp screw 487 can be inserted. The base body 481 and the rotating portion 483 are formed in an integral substantially cylindrical shape that is continuous with each other. As shown in FIG. 5, the base body 481 and the rotating portion 483 have a shape that can be in close contact with the outer periphery of the fastened portion 30. A hole 484 through which the clamp screw 487 can be inserted is provided at the other end of the rotating portion 483. The clamp screw 487 is screwed into a nut 486 held in the hole 484. The nut 486 is held in the hole 484 so as not to rotate.

As shown in FIG. 5, when the clamp screw 487 is spirally rotated in the tightening direction, the distance between one end of the base body 481 and the other end of the circumferential portion 483 is reduced. If it does so, the substantially cylindrical internal diameter by the base body 481 and the circumference part 483 will tighten, and the fastening part 48 will tighten the to-be-fastened part 30. FIG. The base body 481 and the circulating portion 483 grip the fastened portion 30, and the fastening portion 48 is fastened to the fastened portion 30. By this fastening, the dust cover 41 is supported by the mechanical housing 26.

As shown in FIGS. 5 and 6, a projecting hole 49 for projecting the output shaft 31 is provided inside the cover body 43 below the fastening portion 48. A tool holder 32 is provided at the lower end of the output shaft 31 protruding into the cover body 43 through the protruding hole 49. Therefore, when the shaft cover 42 is attached to the tool body 11, the semicircular upper wall 44 is disposed on the upper side with respect to the tool holder 32, and the semicircular lower wall 45 is on the lower side with respect to the tool holder 32. Will be placed. The semicircular upper wall 44 and the semicircular lower wall 45 are arranged to face each other so as to sandwich the tool holder 32 in the vertical direction. The circular arc peripheral wall 46 is arranged toward the handle side of the tool body 11. The shaft cover 42 is attached to the tool body 11 with the circular arc circumferential wall 46 facing the handle portion 17 side.

As shown in FIGS. 5 and 6, when the clamp screw 487 is loosened, the inner diameter of the substantially cylindrical shape by the base body 481 and the revolving part 483 is increased, and the fastening of the fastening part 48 to the fastened part 30 is released. That is, the gripping of the fastened portion 30 by the base body 481 and the rotating portion 483 is released. When the fastening of the fastening portion 48 is released in this way, the user can displace the dust cover 41 in the circumferential direction with respect to the mechanical housing 26. That is, the arcs of the semicircular upper wall 44, the semicircular lower wall 45, and the circular arc peripheral wall 46 are arcs around the fastening portion 48 (output shaft 31) fastened to the fastened portion 30. Therefore, when the shaft cover 42 (dust collection cover 41) is displaced in the arc direction with respect to the mechanical housing 26 and the clamp screw 487 is tightened again, the fastening portion 48 is fastened to the fastened portion 30 and the dust suction cover 41 is connected to the mechanical housing. 26 will be supported.

As shown in FIG. 6 and the like, the semicircular upper wall 44 is provided with seven intake holes (intake openings) 51. The intake hole 51 communicates the inside and the outside of the cover main body 43 (shaft cover 42) so as to open the upper surface. The seven intake holes 51 are arranged at equal intervals in the circumferential direction (arc direction) on the semicircular upper wall 44 forming the upper surface 441. Each of the seven intake holes 51 passes through the semicircular upper wall 44 in a substantially rectangular shape when viewed from above. Of the seven intake holes 51 arranged in the arc direction, the central intake hole 52 disposed in the center is located at the center of the arc of the semicircular upper wall 44. An intake port portion 82 of an intake duct 71 is selectively inserted and connected to one of the seven intake holes 51. The upper surface 441 faces the mechanical housing 26. The rotation direction of the dust cover 41 around the output shaft 31 coincides with the direction in which the circular arc peripheral wall 46 extends, and also coincides with the rotation direction of the output shaft 31.

As shown in FIG. 6, the intake hole 51 includes a central intake hole 52, three intake holes 51 arranged on the left side of the central intake hole 52, and three intake holes 51 arranged on the right side of the central intake hole 52. Have. The seven intake holes 51 are arranged in the rotation direction of the output shaft 31. Therefore, when the shaft cover 42 is rotationally displaced about the output shaft 31 and supported by the tool body 11, the intake duct 71 can be connected to any one of the seven intake holes 51. For example, as shown in FIG. 10, when the dust suction cover 41 is rotated to the left side, the intake hole 51 adjacent to the left of the central intake hole 52 is positioned directly below the tool body 11. When the fastening portion 48 is fastened to the fastened portion 30 at the position of the shaft cover 42, the intake duct 71 can be connected to the intake hole 51 on the left side. The opening of the intake hole 51 is set to a size that allows the intake port portion 82 of the intake duct 71 to be fitted without a gap. It is preferable to insert the intake port portion 82 of the intake duct 71 into the intake hole 51 located directly below the tool body 11.

As shown in FIGS. 4 and 5, the semicircular upper wall 44 is provided with locking bosses 53 protruding upward one by one in the left-right symmetrical position with the output shaft 31 interposed therebetween. The semicircular lower wall 45 is also provided with locking bosses 54 projecting downward at left and right symmetrical positions with the output shaft 31 in between. The locking

bosses

53 and 54 are locked with the locking holes 66 of the member cover 60. The locking

bosses

53 and 54 are provided at locations near the opening 47 in the semicircular upper wall 44 and the semicircular lower wall 45. The member cover 60 is attached to the front side of the opening 47 by locking the locking holes 66 in the locking

bosses

53 and 54. The member cover (second cover) 60 covers the periphery of the cut saw 90 except for or including the blade edge 95.

The member cover 60 is attached to the front side of the shaft cover 42 as shown in FIGS. The member cover 60 has a rectangular tube shape surrounding the top, bottom, left and right while communicating in the front-rear direction. The member cover 60 has a cylindrical shape that opens and extends in a direction from the tool holder 32 toward the blade edge 95 of the cut saw 90. A rear opening 61 and a front opening 62 are set at the rear and front of the member cover 60. The rear opening 61 is set to a square shape that matches the shape of the opening 47 of the shaft cover 42. The front opening 62 is set so as to protrude slightly forward from the cutting edge 95 of the cut saw 90. The member cover 60 is formed of a soft resin that can be easily elastically deformed when a force is applied. That is, the member cover 60 is formed to be extendable and contractable in the direction from the cutting edge 95 of the cut-and-saw 90 toward the attachment portion 91.

1 and 8, the member cover 60 has a bellows portion 63 and an attachment portion 64. The bellows portion 63 has a bellows shape like a flexible tube used in, for example, electric piping. Specifically, the bellows portion 63 is formed so that the uneven shape is continuously repeated. The uneven shape is formed so as to extend in the left-right direction with respect to the upper and lower surfaces, and is formed so as to extend in the up-down direction with respect to the left and right surfaces. As described above, the bellows portion 63 can be expanded and contracted in the forward direction from the output shaft 31 toward the blade edge 95. That is, the length between the

openings

61 and 62 can be relatively deformed in the expansion / contraction direction. The member cover 60 that is relatively deformed in the expansion / contraction direction is restored to its original state by elastic recovery due to its own material properties.

As shown in FIG. 1, the attachment portion 64 is set in a range on the rear side of the bellows portion 63. The attachment portion 64 is formed by providing a locking hole 66 in the smooth end portion 65. Unlike the bellows portion 63, the smooth end portion 65 has a smooth flat plate shape. The smooth end 65 is provided with two locking holes 66 at the top and bottom. The locking hole 66 is a female hole into which the locking bosses 53 and 54 (see FIG. 2) are fitted. The locking hole 66 is provided in the smooth end portion 65 at a position corresponding to the locking

bosses

53 and 54.

As shown in FIG. 1, when the locking

bosses

53 and 54 are fitted into the locking hole 66, the member cover 60 and the shaft cover 42 are integrated to form the dust absorbing cover 41. The front edge 68 of the member cover 60 is an edge that contacts the workpiece. As the cut saw 90 is cut, the front edge 68 of the member cover 60 is pressed against the workpiece, and the bellows portion 63 contracts in the front-rear direction as shown in FIGS. When the front end edge 68 of the member cover 60 is separated from the workpiece, the member cover 60 returns to its original state due to elastic recovery. The resin for forming the member cover 60 is preferably a permeable resin such as a transparent resin so that the cut saw 90 inside the member cover 60 can be seen. Further, the member cover 60 may be formed so as to make the blade edge 95 of the cut saw 90 visible from the outside by making a cut or the like corresponding to the location where the cut saw 90 exists.

As shown in FIG. 2, the intake duct 71 is arranged directly below the tool body 11 and is held by the tool body 11. Specifically, the intake duct 71 includes a duct main body 72 disposed immediately below the tool main body 11, and a duct holder 85 that integrates the duct main body 72 with the motor housing 22. The duct body 72 is formed in a cylindrical shape extending in the front-rear direction. The intake duct 71 is supported on the motor housing 22 by a duct holder 85. The duct body 72 can be functionally divided into a rear duct portion 73 on the rear side and a front duct portion 80 on the front side. The duct main body 72 is molded by blow molding using resin as a material, like the cover main body 43.

As shown in FIG. 2, the rear duct portion 73 and the front duct portion 80 are connected to each other to form a duct body 72, and both the rear duct portion 73 and the front duct portion 80 extend in the front-rear direction. The rear duct portion 73 is disposed immediately below the handle portion 17 until it contacts the motor housing 22. An exhaust port part 74 is provided at the rear end of the rear duct part 73. The lower surface of the rear duct portion 73 is provided with a concavo-convex shape by setting three

concave portions

751, 752, and 753 at appropriate intervals. The three

concave portions

751, 752, and 753 are shaped such that fingers of the hand enter when the user grips the handle portion 17 with a hand. The rear duct portion 73 is provided with a step portion 76 set in the vertical direction between the first concave portion 751 and the second concave portion 752 from the front. The stepped portion 76 is set corresponding to the outer peripheral design of the motor housing 22. A holder concave portion 77 is provided at the rear portion of the rear duct portion 73. The holder recess 77 is recessed one step upward on the front side of the exhaust port portion 74. The holder main body 86 of the duct holder 85 is fitted into the holder recess 77.

As shown in FIG. 1, the duct holder 85 includes a holder main body 86 that holds the duct main body 72, and a locking claw portion 87 that locks the holder main body 86 with the motor housing 22. The holder main body 86 has a curved shape so as to fit into the holder concave portion 77 of the duct main body 72. The locking claw portions 87 are set at both ends of the holder main body 86 and include claws that are locked to the female portion 24 at the lower part of the air inlet 231. Thus, the duct holder 85 is engaged with the female recess 24 of the tool main body 11 by the engaging claw 87 while being fitted in the holder recess 77, and supports the duct main body 72 integrally with the tool main body 11.

As shown in FIG. 2, the front duct portion 80 is disposed immediately below the position straddling the handle portion 17 and the mechanical portion 25. The front duct portion 80 is connected to the rear duct portion 73 via the first bent portion 79. The first bent portion 79 has a shape that bends the front duct portion 80 downward from the rear duct portion 73 in a step shape. For this reason, the front duct portion 80 is disposed away from the tool body 11 by a space S downward. An intake port portion 82 is provided at the front end of the front duct portion 80 via a second bent portion 81. As shown in FIG. 2, the second bent portion 81 has a shape in which the front end portion of the front duct portion 80 is bent downward so that the air inlet portion 82 faces downward.

As shown in FIG. 1, the intake port portion 82 turned downward is inserted into the intake hole 51 of the shaft cover 42. The intake port portion 82 can be inserted into any of the seven intake holes 51 by loosening the clamp screw 487 and rotating the dust cover 41 in the circumferential direction. The intake duct 71 is disposed directly below the tool body 11. For this reason, the intake hole 51 into which the intake port portion 82 is inserted becomes the intake hole 51 positioned directly below the tool body 11. For example, in FIG. 1 and FIG. 2, the air inlet portion 82 is inserted into the central air inlet hole 52 directly below the tool body 11. In FIG. 6, the intake port portion 82 is inserted into the intake hole 51 adjacent to the left of the central intake hole 52 directly below the tool body 11.

2, when the extension part 83 of the front duct part 80 is pushed upward from the lower side, the front duct part 80 is displaced upward so as to narrow the space S with the tool body 11. The intake port portion 82 of the front duct portion 80 inserted into the intake hole 51 is displaced so as to come out of the intake hole 51. After the suction port portion 82 is removed from the suction hole 51, the clamp screw 487 can be loosened to rotate the dust suction cover 41 in the circumferential direction. The direction of the dust-absorbing cover 41 is generally adjusted to the protruding direction of the cut saw 90 held by the tool holder 32.

As shown in FIGS. 1 and 6, the shaft cover 42 includes a semicircular upper wall 44 and a semicircular lower wall 45 facing each other in a semicircular shape in plan view, and an arc peripheral wall 46 that connects arc edges 442 and 452 to each other. Have The circular arc peripheral wall 46 is arranged facing the handle portion 17 side of the tool body 11. For this reason, the cutting powder generated by cutting is blocked by the arc peripheral wall 46 even if it comes toward the handle holding the handle portion 17. Cutting powder generated by cutting is prevented from falling on the operator, and cutting workability can be improved. In particular, when the house ceiling is cut, the gripping powder generated by the cutting tends to fall on the operator with the handle side holding the handle portion 17 on the lower side. On the other hand, according to the dust suction device 40, the generated cutting powder can be received by the arc peripheral wall 46, and the cutting workability can be improved.

As shown in FIGS. 1 and 10, the cutting edge 90 side of the cutting saw 90 is rotated with respect to the tool body 11, and the intake duct 71 is rotated to each position accordingly. As shown in FIG. 6, seven intake holes 51 are arranged in the arc direction. Therefore, a selected one of the intake holes 51 is connected to the intake duct 71 at each position of the intake duct 71. Therefore, the intake hole 51 can be easily connected to the intake duct 71. Even when the blade edge 95 of the cut-and-saw 90 is rotated, the cutting powder can be sucked satisfactorily and cutting workability can be improved. Since the intake duct 71 is supported by the motor housing 22 of the tool body 11, it is stably supported. Thereby, cutting workability | operativity can be improved.

As shown in FIG. 1, the intake hole 51 is set on the upper surface 441 of the shaft cover 42 that faces the tool body 11. The intake duct 71 is located below the tool body 11. Therefore, the vertical dimension of the intake duct 71 can be reduced. Thereby, the configuration of the multitool 10 can be made compact, and the operability of the multitool 10 can be improved. The dust suction device 40 includes a member cover 60 having a cylindrical shape that opens and extends in a direction from the tool holder 32 toward the cutting edge 95 of the cut-and-sew 90. Since the member cover 60 is formed to be extendable and contractible in the direction from the blade edge 95 of the cut saw 90 toward the attachment portion 91, the member cover 60 can cover the periphery of the blade edge 95 of the cut saw 90. Accordingly, the cutting powder can be sucked preferably while suppressing the scattering of the cutting powder generated from the blade edge 95 of the cut-and-sew 90.

The multitool 10 may have an intake duct 71A and a dust collection cover 41A shown in FIG. 11 instead of the intake duct 71 and the dust collection cover 41 shown in FIG. The dust suction cover 41 </ b> A has a suction hole 51 </ b> A in the circular arc peripheral wall 46 that forms the side surface 461. For this reason, the front duct portion 80A of the intake duct 71A connected to the intake hole 51A is provided with a third bent portion 841 and a fourth bent portion 842 corresponding thereto.

As shown in FIG. 11, the third bent portion 841 has a shape that can be bent so that the front side range of the front duct portion 80A faces downward. The fourth bent portion 842 has a shape in which the front end portion of the front duct portion 80 is bent forward so that the air inlet portion 82A faces forward. As a result, the opening direction of the intake port portion 82A and the opening direction of the dust cover 41 can be matched, and dust can be absorbed efficiently. Intake holes 51 of other dust suction devices may be inserted into the suction holes 51 of FIG. 2 and the suction holes 51A of FIG. 11, and may be sucked by other dust suction devices.

As shown in FIG. 2, a cut-and-sew 90 is attached to the multi-tool 10. Instead of the cut saw 90, a round saw 90A may be attached to the multitool 10A as shown in FIG. The multitool 10A is configured similarly to the multitool 10 described above except that the saw blade member is a round saw 90A. The cutting edge 95A of the round saw 90A is formed in an arc shape when viewed from above. The arcuate shape of the blade edge 95A may be set over an angle of 180 to 270 degrees, or may be set over an angle of 360 degrees all around. A part of the blade edge 95A of the round saw 90A constitutes a blade edge of a saw blade member facing the cutting material. In other words, the reciprocating round saw 90A cuts the cutting material only with the cutting edge within the range facing the cutting material. Examples of the member illustrated include TMA006BIM manufactured by Makita Corporation. Even when such a round saw 90A is attached to the tool holder 32 as a saw blade member, the same effects as those of the dust suction device 40 described above can be obtained.

As shown in FIG. 6, the shaft cover 42 has an upper member 50 and a lower member 55 which are separated. By fitting the fitting portion 57 and the overlapping portion 58 of the lower member 55 to the upper member 50, the upper member 50 and the lower member 55 are united together. The multitool 10 may have the shaft cover 42A shown in FIG. 13 instead of the shaft cover 42 shown in FIG. 6, and FIG. 13 is a development view of the shaft cover 42A. The shaft cover 42A has a hinge portion 57A having a hinge structure in place of the fitting portion 57 shown in FIG. In the hinge portion 57A, the upper member 50A and the lower member 55A are hinge-coupled via a hinge pin 58A.

As shown in FIG. 13, the upper member 50A is provided with a pair of upper bearing portions 591 that support the hinge pin 58A. A lower bearing portion 592 that supports the hinge pin 58A is also provided between the pair of upper bearing portions 591 in the lower member 55A. The upper member 50A and the lower member 55A can be relatively rotated via a hinge pin 58A. The shaft cover 42A has the same configuration as the shaft cover 42 except for the hinge portion 57A. For this reason, about the same component location, the code | symbol same as the code | symbol attached to the shaft cover 42 is attached | subjected, and description is abbreviate | omitted.

Claims

A power tool for reciprocating a saw blade member at a predetermined angle to cut a workpiece,
A tool body;
An output shaft protruding from the tool body;
A motor provided in the tool body for reciprocating the saw blade member attached to the output shaft at a predetermined angle to cut a workpiece;
An attachment portion provided at a lower end of the output shaft to which the saw blade member is attached;
A first cover that is attached to the tool main body and covers an outer periphery of the attachment portion and opens a front side that is a cutting edge side of the saw blade member;
The first cover is
A lower wall portion facing the mounting portion on the lower side of the mounting portion in a semicircular shape in plan view;
An upper wall portion that is semicircular in plan view and that faces the lower wall portion above the mounting portion;
The electric tool which has the surrounding wall part which connects the edge of the circular arc of the said lower wall part and the said upper wall part, and is arrange | positioned toward the handle side of the said tool main body.
The power tool according to claim 1,
The first cover is supported by the tool body so as to be displaceable in the arc direction,
In the first cover, a plurality of intake openings communicating with the inside and outside of the first cover are arranged in the arc direction, and by displacing the first cover, the plurality of intake openings. An electric tool in which the other one is located at a location corresponding to the intake duct and is connected to the intake duct instead of the one.
In the electric tool according to claim 2,
The air intake duct is a power tool supported by a housing of the tool body.
In the electric tool according to claim 2 or claim 3,
The power tool, wherein the upper wall portion of the first cover includes the intake opening.
In the electric tool according to any one of claims 1 to 4,
An electric tool having a cylindrical second cover attached to the front side of the first cover and extending from the attachment portion in a direction toward the cutting edge of the saw blade member.
The electric tool according to claim 5,
The said 2nd cover is an electric tool comprised so that expansion-contraction is possible in the direction which goes to the said attaching part from the said blade edge | tip of the said saw blade member.