JP6621641B2 - Electric tool - Google Patents

Description

  The present invention relates to an electric tool that cuts a workpiece by reciprocating a saw blade member attached to an output shaft at a predetermined angle.

  An electric tool called a multi-tool is known. This electric tool incorporates a motor as a drive source. The motor rotates the output shaft. The output shaft reciprocates at a high speed at a small angle. In this type of electric power tool, a sanding pad may be attached to the output shaft (see, for example, Patent Document 1). The sanding pad is driven by a motor to grind the processed surface of the wood. In the electric power tool disclosed in Patent Document 1, in order to remove abrasive dust, dust generated by attaching a discharge connecting part to a discharge hood is removed.

  In such a power tool, a saw blade member called a cut saw or a round saw may be attached to the output shaft instead of the sanding pad. Thus, the saw blade member attached to the output shaft reciprocates the saw blade member including the blade tip portion at a minute angle. The cutting edge portion cuts the workpiece by the reciprocating motion.

Japanese Examined Patent Publication No. 7-77707

  On the other hand, in the use of the above-described electric tool, there is a scene where the house ceiling is cut. In such a scene, since the workpiece is cut over the operator's head, the cutting powder generated by the cutting falls from the overhead toward the operator. In such a situation where the cutting powder falls, it becomes difficult for the operator to perform the cutting operation.

  The present invention has been made in view of such circumstances, and a problem to be solved by the present invention is to reciprocate a saw blade member attached to an output shaft at a predetermined angle to cut a workpiece. In an electric power tool, cutting powder generated by cutting does not fall on an operator, and the workability at the time of such cutting is improved.

  In solving the above-described problems, the power tool according to the present invention takes the following means. That is, the power tool according to the first aspect of the present invention has a tool body and an output shaft protruding from the tool body, and a saw blade member attached to the output shaft is reciprocated at a predetermined angle to be covered. An electric power tool for cutting a workpiece, wherein an attachment portion for attaching the saw blade member is provided at a lower end of the output shaft, and the tool body has a cutting edge side of the saw blade member. A first cover that opens the front side and covers the outer periphery of the mounting portion is attached, and the first cover is a semicircular plan view and a lower wall portion facing the mounting portion on the lower side of the mounting portion; A semi-circular shape in plan view that forms a pair with the lower wall portion, an upper wall portion that faces the lower wall portion on the upper side of the mounting portion, and a peripheral wall that connects edges of arcs of the lower wall portion and the upper wall portion And the peripheral wall portion is disposed toward the handle side of the tool body. It is a configuration.

  According to the electric tool of the first aspect of the invention, the first cover has an upper wall portion and a lower wall portion facing each other in a semicircular shape in plan view, and a peripheral wall portion that connects arc edges. Here, since the peripheral wall portion is arranged toward the handle side of the tool body, the cutting powder generated by the cutting is blocked by the peripheral wall portion even when it comes toward the handle side. Thereby, the cutting powder generated by cutting does not fall on the operator, and workability at the time of cutting can be improved.

  An electric power tool according to a second aspect of the present invention is the electric power tool according to the first aspect, wherein the first cover is supported by the tool body so as to be capable of rotational displacement in the arc direction. The cover is provided with a plurality of intake openings that communicate with the inside and outside of the first cover in the arc direction, and each of the intake openings rotates the first cover to displace the tool. In each position supported by the main body, it is configured to be connectable to an intake duct.

  According to the electric tool of the second invention, a plurality of intake openings are arranged in the arc direction, and each of the intake openings is rotationally displaced and connected to the intake duct at each position supported by the tool body. be able to. As a result, the intake opening can be easily connected to the intake duct even if the cutting edge side of the saw blade member is rotationally displaced with respect to the tool body and the first cover is rotationally displaced accordingly. Therefore, even when the blade edge side of the saw blade member is rotationally displaced, the cutting powder can be sucked well and the workability of the operator can be improved.

  An electric power tool according to a third aspect of the present invention is the electric power tool according to the second aspect, wherein the intake duct is supported by a housing of the tool body. According to the electric tool of the third aspect of the invention, since the intake duct is supported by the housing of the tool body, the intake duct for sucking the cutting powder can be stably supported, and the operator's work Can increase the sex.

  The power tool according to a fourth aspect of the present invention is the power tool according to the second or third aspect, wherein the intake opening is formed on an upper side surface of the first cover facing the tool body. The configuration is set. According to the electric power tool of the fourth invention, since the intake opening is set on the upper side of the first cover that faces the tool body, the connection position of the intake duct with respect to the first cover is set. It can be set on the upper side, and when the intake duct is provided, the vertical dimension of the intake duct can be reduced. As a result, the configuration of the power tool can be summarized in a compact manner, and the operability of the power tool can be improved.

  The power tool according to a fifth aspect of the present invention is the power tool according to any one of the first to fourth aspects, wherein the blade edge of the saw blade member extends from the attachment portion to the front side of the first cover. A cylindrical second cover that extends in an opening direction is attached, and the second cover is formed to be extendable in a direction from the cutting edge of the saw blade member toward the attachment portion. This is the configuration. According to the electric power tool of the fifth aspect of the invention, the cylindrical second cover that opens and extends in the direction from the attachment portion toward the cutting edge of the saw blade member is attached to the front side of the first cover. Since this 2nd cover is formed so that expansion-contraction is possible in the direction which goes to the attachment part from the blade edge of a saw blade member, the 2nd cover can cover the blade edge circumference of a saw blade member. Accordingly, it is possible to preferably suck the cutting powder while suppressing the scattering of the cutting powder generated from the blade edge of the saw blade member.

It is a perspective view which shows a multi tool. It is a left view which shows the multi tool of FIG. It is sectional drawing which shows the (III)-(III) cross-section arrow of the multitool of FIG. It is sectional drawing which shows the (IV)-(IV) cross-section arrow of the multitool of FIG. It is a perspective view which shows the multi tool of FIG. 1 from which the member cover is removed. It is a perspective view which shows the single item of a shaft cover. It is a perspective view which shows the attachment part which removes a shaft cover and attaches a saw blade member. It is a perspective view which shows the multi tool with which the member cover shrunk and the blade edge part was taken out. It is a left view which shows the multi tool of FIG. It is a top view which shows the multi tool which is rotating the dust suction cover on the left side. It is a left view which shows the modification from which a connection location differs regarding an intake duct. It is a perspective view which shows the multitool which replaced | exchanged the cut-and-sew as a front-end tool for the round saw. It is an expansion | deployment front view of the shaft cover which shows the modification of a shaft cover.

  Hereinafter, an embodiment for carrying out an electric tool according to the present invention will be described with reference to FIGS. Reference numeral 10 shown in the perspective view of FIG. 1 and the left side view of FIG. 2 is a multi-tool as a power tool according to the present invention. The multi-tool 10 is an electric tool that 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. FIG. 3 is a cross-sectional view showing the (III)-(III) cross-section of the multitool 10 of FIG. FIG. 4 is a cross-sectional view showing the (IV)-(IV) cross-section of the multitool 10 of FIG. FIG. 5 is a perspective view showing the multi-tool 10 of FIG. 1 with the member cover 60 removed. FIG. 6 is a perspective view showing a single item of the shaft cover 42. FIG. 7 is a perspective view showing the tool holder 32 to which the shaft cover 42 is removed and the cut saw 90 is attached. FIG. 8 is a perspective view showing the multi-tool 10 in which the member cover 60 is contracted and the blade edge portion 95 is protruded. FIG. 9 is a left side view showing the multi-tool 10 of FIG.

  In the multi-tool 10 shown in FIGS. 1 to 9, the output shaft 31 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 32 holds a cut saw 90 as a tip tool. The tool holder 32 corresponds to a mounting portion according to the present invention, and the cut saw 90 corresponds to a saw blade member according to the present invention. The multi-tool 10 reciprocates the cutting edge portion 95 of the cut-and-saw 90 at a high speed at a high angle when cutting the workpiece. The cut saw 90 can be roughly divided into an attachment portion 91, a long plate portion 93, and a blade edge portion 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 portion 95. The long plate portion 93 is formed in a plate shape having a rectangular shape in a top view extending from the attachment portion 91 to the blade edge portion 95. The blade edge portion 95 is provided with a saw blade. This blade is set to extend in a direction orthogonal to the direction in which the long plate portion 93 extends. That is, the blade edge portion 95 is formed in a straight shape. The cutting edge 95 of the cut saw 90 is disposed on the side where the cutting material is cut by the cut saw 90 and faces the cutting material. Incidentally, examples of the illustrated member include TMA009BIM manufactured by Makita Corporation.

  The multi-tool 10 reciprocates the cutting edge portion 95 of the cut-and-saw 90 attached to the tool holder 32. The reciprocating motion of the blade edge portion 95 is due to the reciprocating rotation of the output shaft 31 to which the cut saw 90 is attached. The angle at which the output shaft 31 reciprocally rotates is set to “3.2 degrees” which is a minute angle. Since the reciprocating rotation of the output shaft 31 is a high-speed rotation, the reciprocating motion of the blade edge portion 95 is a reciprocating motion that vibrates. A round saw 90A described later also corresponds to a saw blade member according to the present invention, but differs from the blade edge portion 95 of the cut saw 90 in that the blade edge portion 95A is formed in an arc shape. Incidentally, the round saw 90 </ b> A is also a tip tool that can be replaced with the tool holder 32, similarly to the cut saw 90. The tip tool includes a scraper used for paint peeling work, a sanding pad used for grinding work and polishing work, and the like.

  The multi-tool 10 generally includes a tool body 11 and a dust suction device 40. As shown in FIG. 3, the tool 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 has a substantially cylindrical housing structure. An operation switch 151 is provided on the front side and the upper side of the motor housing 22. When the operation switch 151 is slid forward, an ON input is made to the controller 155 inside the motor housing 22. The controller 155 receives a speed input 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 input and the on input. Incidentally, the motor housing 22 is formed in a cylindrical shape. For this reason, the outer periphery of the motor housing 22 is set as the handle portion 17 of the multitool 10 that is easily gripped by hand.

  The motor 210 drives the motor shaft 211 to rotate. The motor shaft 211 is rotatably supported 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. This electricity flow is controlled by the controller 155. The motor 210 to which electricity is passed drives the motor shaft 211 to rotate. The rotationally driven motor shaft 211 inputs a rotational driving force to the mechanical unit 25 while rotating the cooling fan 225.

  A cooling fan 225 is attached to the front portion of the motor shaft 211. The cooling fan 225 is constituted by 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. An air inlet 231 is provided at the rear part of the motor housing 22. An exhaust port 232 is provided at the front 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. In addition, a female portion 24 that locks the locking claw portion 87 of the duct holder 85 is provided below the intake port 231.

  As shown in FIGS. 3 and 4, the mechanical unit 25 is configured by incorporating a mechanical unit inside a mechanical housing 26. An eccentric shaft portion 271 is provided at the front end of the motor shaft 211. The eccentric shaft portion 271 is provided on the front side of the front bearing 222. The eccentric shaft part 271 receives the rotational drive of the motor shaft 211 and moves eccentrically. A sphere bearing 273 is attached to the outer periphery of the eccentric shaft portion 271. The sphere bearing 273 is a rolling bearing whose 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.

  The swing receiving portion 281 is provided with an appropriate clearance between the sphere bearing 273 in the vertical direction. The swing receiving portion 281 is in close contact with the sphere bearing 273 in the left-right direction. Therefore, 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 up and down. Yes. For this reason, the swing receiving portion 281 follows the eccentric motion of the eccentric shaft portion 271 so as to swing in the left-right direction. The swing receiving portion 281 is integrated and reciprocates in the rotational direction of a swing fulcrum 283 serving as a swing fulcrum. Since the swing fulcrum part 283 is integrated with the output shaft 31, the reciprocating motion of the swing fulcrum part 283 in the rotation direction causes the output shaft 31 to reciprocate (reciprocate and rotate).

  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 supported in this manner extends in the vertical direction orthogonal to the motor shaft 211. The lower part of the output shaft 31 is exposed to the outside, and the tool holder 32 described above is attached to the lower end of the output shaft 31. The cut saw 90 attached to the output shaft 31 via the tool holder 32 can cut the workpiece by reciprocating the blade edge portion 95 at a minute angle in accordance with the reciprocating rotation of the output shaft 31. The lower part of the outer periphery of the mechanical housing 26 is formed as a cylindrical fastened part 30 as shown in FIG. The fastening portion 48 of the shaft cover 42 is fastened to the fastened portion 30.

  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 as a first cover and a member cover 60 as a 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. As shown in FIGS. 2 and 3, the shaft cover 42 includes a cover 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 portion 95 of the cut saw 90. As shown in FIG. 6, the shaft cover 42 has a semicircular upper wall 44, a semicircular lower wall 45, and a circular arc peripheral wall 46. The semicircular upper wall 44 corresponds to the upper wall portion according to the present invention. The semicircular upper wall 44 is formed in a semicircular shape in plan view. The semicircular lower wall 45 is also formed in a semicircular shape in plan view that forms a pair with the semicircular upper wall 44. The semicircular lower wall 45 corresponds to a lower wall portion according to the present invention. Further, the arc end edge 442 of the semicircular upper wall 44 and the arc end edge 452 of the semicircular lower wall 45 are formed so as to be connected by the arc peripheral wall 46. The circular arc peripheral wall 46 corresponds to a peripheral wall portion according to the present invention. That is, the cover main body 43 of the shaft cover 42 is formed in a shape in which only the front side is opened and is closed by the semicircular upper wall 44, the semicircular lower wall 45, and the circular arc peripheral wall 46 with respect to the upper, lower, left, and right sides.

  That is, the semicircular upper wall 44 forms an upper surface 441, the semicircular lower wall 45 forms a lower surface 451, and the circular arc peripheral wall 46 forms a side surface 461. An opening 47 is provided on the front surface of the cover main body 43. The opening 47 is opened in a rectangular shape 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. 3 and 6, the 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. .

  A fastening portion 48 is provided on the semicircular upper wall 44. 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 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. Such a base body 481 and the surrounding portion 483 are formed in 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.

  That is, 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 surrounding 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.

  A projecting hole 49 for projecting the output shaft 31 is provided inside the cover main body 43 below the fastening portion 48. Here, a tool holder 32 is provided at the lower end of the output shaft 31 protruding into the cover main 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. Here, the circular arc peripheral wall 46 is arranged facing 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.

  On the other hand, when the clamp screw 487 is loosened, the substantially cylindrical inner diameter formed by the base body 481 and the rotating portion 483 is loosened, and the fastening of the fastening portion 48 to the fastened portion 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 suction cover 41 with respect to the mechanical housing 26 in the rotational circumferential direction. That is, the arc direction of the semicircular upper wall 44, the semicircular lower wall 45, and the circular arc peripheral wall 46 is an extending direction of an arc drawn 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 51. The intake hole 51 corresponds to an intake opening according to the present invention. The intake hole 51 is formed by communicating 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 rotation 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. As shown in FIG. 6, the central intake hole 52 disposed in the center among the seven intake holes 51 arranged in the arc direction is located at the center of the arc of the semicircular upper wall 44. These seven intake holes 51 can be connected by inserting the intake port portion 82 of the intake duct 71. The upper surface 441 faces the mechanical housing 26 of the shaft cover 42. This rotational circumferential direction is a direction that coincides with the direction in which the circular arc peripheral wall 46 extends, and is also a direction that coincides with the rotational direction of the output shaft 31.

  The other intake holes 51 are arranged on the left side and three on the right side with the central intake hole 52 as a boundary. Thus, seven intake holes 51 serving as intake openings are arranged in the rotational circumferential direction of the output shaft 31. Therefore, each of the seven intake holes 51 can be connected to the intake duct 71 at each position where the shaft cover 42 is rotationally displaced and supported by the tool body 11. For example, as shown in FIG. 10, when the dust suction cover 41 is rotated to the left, the suction hole 51 adjacent to the left of the central suction 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. Incidentally, the size of 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. Incidentally, in order to insert the intake port portion 82 of the intake duct 71 into the intake hole 51, it is preferable that the intake hole 51 is positioned directly below the tool body 11.

  The semicircular upper wall 44 is provided with one locking boss 53 protruding upward at a symmetrical position with the output shaft 31 in between. 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. These locking bosses 53 and 54 are bosses to which locking holes 66 of the member cover 60 described below are locked. These 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 to the locking bosses 53 and 54. This member cover 60 corresponds to a second cover according to the present invention. The member cover 60 covers the periphery of the cut saw 90 except for the blade edge portion 95.

  The member cover 60 is attached to the front side of the shaft cover 42. 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 the direction from the tool holder 32 toward the cutting edge portion 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 portion 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 in the direction from the blade edge portion 95 of the cut-and-saw 90 toward the attachment portion 91.

  The shape of the member cover 60 can be divided into a bellows portion 63 and an attachment portion 64. The bellows portion 63 is formed in 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 portion 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.

  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 above-described bellows portion 63, the smooth end portion 65 is formed into 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 described above are fitted. For this reason, the locking hole 66 is provided in the smooth end portion 65 at a position corresponding to the locking bosses 53 and 54 described above.

  When the locking bosses 53 and 54 are fitted into the locking holes 66 described above, the member cover 60 and the shaft cover 42 are integrated to form the dust suction cover 41. The front edge 68 of the member cover 60 is an edge that contacts the workpiece. As the cut-and-saw 90 is cut, the front edge 68 of the member cover 60 comes into contact with and is pushed, and the bellows portion 63 acts to contract in the front-rear direction as shown in FIGS. Further, the member cover 60 returns to its original state by elastic recovery when the contact of the front edge 68 with the workpiece is released. In addition, as resin which shape | molds the member cover 60, it is preferable that it is resin which has permeability | transmittance like a transparent resin, for example so that the cut-and-sew 90 inside the member cover 60 can be visually recognized. Furthermore, the portion of the member cover 60 where the cut saw 90 exists may be cut so as to make the blade edge portion 95 of the cut saw 90 visible from the outside.

  The intake duct 71 is disposed 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.

  The rear duct portion 73 and the front duct portion 80 are connected to each other to form a duct main 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. These three concave portions 751, 752, and 753 are formed in a shape that allows the fingers of the gripped hand to enter when the user grips the handle portion 17 with the 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 set in a shape that 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.

  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 to the motor housing 22. The holder body 86 is formed in a curved shape so as to fit into the holder recess 77 of the duct body 72. The locking claw portions 87 are set at both ends of the holder main body 86 and are set in a claw shape that is locked to the female portion 24 below the intake port 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.

  The front duct portion 80 is disposed directly 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 is set in a shape that bends in a step shape from the rear duct portion 73 toward the lower side of the front duct portion 80. 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 is set in a shape that bends the front end portion of the front duct portion 80 downward so that the air inlet portion 82 faces downward.

  The intake port portion 82 that is directed 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 displacing the dust cover 41 in the rotational circumferential direction. However, as described above, 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 located directly below the tool body 11 among the seven intake holes 51 displaced in the rotational circumferential direction. For example, in FIG. 1 and FIG. 2, the air inlet portion 82 is inserted into the central air intake hole 52 directly below the tool main body 11, and in FIG. 6, the air intake hole 51 adjacent to the left of the central air intake hole 52 directly below the tool main body 11 is inserted. An intake port portion 82 is inserted.

  Incidentally, when the extending portion 83 of the front duct portion 80 extending in the front-rear direction is pushed upward from the lower side, the front duct portion 80 is displaced upward so as to narrow the space S with the tool body 11 described above. Then, 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. In this way, after the intake port portion 82 is removed from the intake hole 51, the clamp screw 487 can be loosened to displace the dust cover 41 in the rotational circumferential direction. The displacement in the rotational circumferential direction of the dust cover 41 is generally adjusted to the protruding direction of the cut saw 90 held by the tool holder 32.

  According to the dust suction device 40 of the multitool 10 described above, the following operational effects can be achieved. In other words, according to the dust suction device 40 described above, the shaft cover 42 has the semicircular upper wall 44 and the semicircular lower wall 45 facing each other in a semicircular shape in plan view, and the arc peripheral wall connecting the arc edges 442 and 452 to each other. 46. Here, since the circular arc peripheral wall 46 is disposed toward the handle portion 17 side of the tool body 11, the cutting powder generated by cutting is blocked by the circular arc peripheral wall 46 even when it comes toward the handle holding the handle portion 17. Will be. Thereby, the cutting powder generated by cutting does not fall on the operator, and workability at the time of cutting 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. However, according to the dust suction device 40 described above, the generated cutting powder can be received by the arc peripheral wall 46, and the workability of the operator can be improved.

  Further, according to the dust suction device 40 described above, seven intake holes 51 are arranged in the arc direction, and each of the intake holes 51 is rotationally displaced and connected to the intake duct 71 at each position supported by the tool body 11. Can do. Thus, even if the cutting edge 90 side of the cutting saw 90 is rotationally displaced with respect to the tool body 11 and the shaft cover 42 is rotationally displaced accordingly, the intake hole 51 can be easily connected to the intake duct 71. . Therefore, even when the cutting edge 90 side of the cutting saw 90 is rotationally displaced, the cutting powder can be sucked satisfactorily and the workability of the operator can be improved. Further, according to the dust suction device 40 described above, since the intake duct 71 is supported by the motor housing 22 of the tool body 11, the intake duct 71 that sucks the cutting powder can be stably supported, The workability of the worker can be improved.

  Further, according to the dust suction device 40 described above, since the intake hole 51 is set on the upper surface 441 of the shaft cover 42 facing the tool body 11, the connection position of the intake duct 71 with respect to the shaft cover 42 is set to the upper side. When the intake duct 71 is provided, the vertical dimension of the intake duct 71 can be reduced. Accordingly, the configuration of the multitool 10 can be summarized in a compact manner, and the operability of the multitool 10 can be improved. Further, according to the dust suction device 40 described above, the member cover 60 having a cylindrical shape that is open and extends in the direction from the tool holder 32 toward the cutting edge portion 95 of the cut-and-sew 90 is attached. Since the member cover 60 is formed to be extendable and contractible in the direction from the blade edge portion 95 of the cut saw 90 toward the attachment portion 91, the member cover 60 can cover the periphery of the blade edge portion 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 portion 95 of the cut-and-saw 90.

  In addition, in the electric tool which concerns on this invention, it is not limited to above-described embodiment, A various change can be added suitably. For example, the front duct portion 80 of the intake duct 71 described above may be configured as follows. Reference numeral 71 </ b> A in the left side view of FIG. 11 shows a modified example in which connection portions are different with respect to the intake duct 71. The intake hole 51 </ b> A provided in the dust cover 41 </ b> A is provided in the circular arc peripheral wall 46 that forms the side surface 461. Therefore, the front duct portion 80A of the intake duct 71A connected to the intake hole 51A is also provided with a third bent portion 841 and a fourth bent portion 842 corresponding thereto.

  The 3rd bending part 841 is set to the shape bent so that the front side range of 80 A of front duct parts may face downward. The fourth bent portion 842 is set to have a shape that bends the front end portion of the front duct portion 80 forward so that the air inlet portion 82A faces forward. Even when the intake duct 71 is set as described above, the opening direction of the intake port portion 82A and the opening direction of the dust-absorbing cover 41 can be matched, and dust can be absorbed efficiently. Further, in the intake holes 51 and 51A described above, the intake nozzles of other dust suction devices may be inserted to take in air.

  FIG. 12 is a perspective view showing a multitool 10A in which a cutting saw 90 as a saw blade member is replaced with a round saw 90A. The multitool 10A is configured in the same manner as the multitool 10 described above except that the saw blade member is a round saw 90A. The blade edge portion 95A of the round saw 90A is formed in an arc shape when viewed from above. The circular arc shape of the blade edge portion 95A may be set so as to extend over an angle of 180 to 270 degrees, or may be set over an angle of 360 degrees on the entire circumference. The “blade edge of the saw blade member” in the blade edge portion 95A of the round saw 90A is a blade edge portion in a range facing the cutting material in the blade edge portion 95A. That is, the reciprocating round saw 90A cuts the cutting material at the cutting edge portion in a range facing the cutting material. Incidentally, examples of the member shown in the figure 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 above-described effects of the dust suction device 40 can be obtained in substantially the same manner.

  FIG. 13 is a development view of the shaft cover 42A. The shaft cover 42A is a modification of the shaft cover 42 described above. That is, the above-described shaft cover 42 is formed by fitting the fitting portion 57 and the overlapping portion 58 of the lower member 55 to the upper member 50 when the upper member 50 and the lower member 55 to be separated are united together. It was a thing. On the other hand, the shaft cover 42A shown in FIG. 13 is replaced with a hinge portion 57A in which the fitting portion 57 forms a hinge structure. That is, in the hinge portion 57A, the upper member 50A and the lower member 55A are hinged together through the hinge pin 58A.

  Specifically, the upper member 50A is provided with a pair of upper bearing portions 591 that support the hinge pins 58A, and the lower member 55A also includes a lower bearing portion 592 that supports the hinge pins 58A of the pair of upper bearing portions 591. It is provided in between. Accordingly, the upper member 50A and the lower member 55A can be relatively rotated via the hinge pin 58A. The shaft cover 42A differs from the above-described shaft cover 42 only in the structure of the hinge portion 57A. For this reason, about the other same location, the code | symbol attached | subjected to the above-mentioned shaft cover 42 is attached | subjected to drawing, and description is abbreviate | omitted.

10 Multi tools (electric tools)
11 Tool body 151 Operation switch 152 Speed dial 155 Controller 17 Handle portion 21 Motor portion 210 Motor 211 Motor shaft 212 Stator 213 Rotor 214 Coil 215 Commutator 22 Motor housing 221 Rear bearing 222 Front bearing 225 Cooling fan 231 Intake port 232 Exhaust port 24 Female portion 25 Mechanical portion 26 Mechanical housing 271 Eccentric shaft portion 273 Sphere bearing 28 Swing arm 281 Swing receiving portion 283 Swing fulcrum portion 30 Fastened portion 31 Output shaft 311 Upper bearing 312 Lower bearing 32 Tool holder (mounting portion)
40 Dust Absorber 41 Dust Absorber Cover 42 Shaft Cover (First Cover)
43 Cover body 44 Semicircular upper wall 441 Upper surface 442 Arc end edge 45 Semicircular lower wall 451 Lower surface 452 Arc end edge 46 Arc peripheral wall 461 Side surface 47 Opening portion 48 Fastening portion 481 Base body 482 Screw hole 483 Circumferential portion 484 Hole 486 Nut 487 Clamp screw 49 Projection hole 50 Upper member 51 Intake hole (intake opening)
52 Central intake holes 53, 54 Locking boss 55 Lower member 57 Fitting portion 58 Overlapping portion 591 Upper bearing portion 592 Lower bearing portion 60 Member cover (second cover)
61 rear opening 62 front opening 63 bellows part 64 attachment part 65 smooth end part 66 locking hole 68 front end edge 71 intake duct 72 duct body 73 rear duct part 74 exhaust port part 751, 752, 753 concave part 76 step part 77 Holder concave portion 79 First bent portion 80 Front duct portion 81 Second bent portion 82 Inlet port portion 83 Extending portion 841 Third bent portion 842 Fourth bent portion 85 Duct holder 86 Holder body 87 Locking claw portion 90 Cut saw (saw blade member)
90A round saw (saw blade member)
91 Mounting part 93 Long plate part 95 Cutting edge part S Space

Claims (5)

An electric tool having a tool body and an output shaft protruding from the tool body, and cutting a workpiece by reciprocating a saw blade member attached to the output shaft at a predetermined angle,
An attachment portion for attaching the saw blade member is provided at the lower end of the output shaft,
A first cover is attached to the tool body to cover the outer periphery of the attachment portion by opening the front side that is the cutting edge side of the saw blade member.
The first cover is
A lower wall facing the mounting portion on the lower side of the mounting portion in a semicircular shape in plan view;
An upper wall portion facing the lower wall portion on the upper side of the attachment portion in a semicircular shape in a plan view that forms a pair with the lower wall portion;
A peripheral wall part connecting the edges of the arcs of the lower wall part and the upper wall part, and
The peripheral wall portion is disposed toward the handle side of the tool body ,
The first cover is supported by the tool body so as to be capable of rotational displacement in the arc direction,
In the first cover, a plurality of intake openings that communicate with the inside and outside of the first cover are arranged in the arc direction,
Each of the intake openings is configured to be connectable to an intake duct at each position where the first cover is rotationally displaced and supported by the tool body . The power tool according to claim 1 ,
The air intake duct is a power tool supported by a housing of the tool body. In the electric tool according to claim 1 or claim 2 ,
The intake opening is an electric tool set on an upper side surface of the first cover that faces the tool body. In the electric tool according to any one of claims 1 to 3 ,
On the front side of the first cover, a cylindrical second cover that extends from the mounting portion in a direction toward the blade edge of the saw blade member is attached,
The said 2nd cover is an electric tool formed 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. And an output shaft projecting from the tool body and the tool body, said output shaft is perpendicular to the motor shaft of a motor housed in the tool body, to be processed in the saw blade member attached to said output shaft An electric tool for cutting material,
An attachment portion for attaching the saw blade member is provided at the lower end of the output shaft,
A first cover is attached to the tool body to cover the outer periphery of the attachment portion by opening the front side that is the cutting edge side of the saw blade member.
The first cover is
A lower wall facing the mounting portion on the lower side of the mounting portion in a semicircular shape in plan view;
An upper wall portion facing the lower wall portion on the upper side of the attachment portion in a semicircular shape in a plan view that forms a pair with the lower wall portion;
A peripheral wall part connecting the edges of the arcs of the lower wall part and the upper wall part, and
The peripheral wall portion is disposed toward the handle side of the tool body ,
The first cover is supported by the tool body so as to be capable of rotational displacement in the arc direction,
In the first cover, a plurality of intake openings that communicate with the inside and outside of the first cover are arranged in the arc direction,
Each of the intake openings is configured to be connectable to an intake duct at each position where the first cover is rotationally displaced and supported by the tool body .

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