Dust collection system for electric tool

Abstract

Provided is a dust collection system for an electric tool, which prevents noise generated in a DC motor of a dust collection attachment from propagating to a power supply path of the electric tool. The dust collection system for an electric tool includes an electric tool and a dust collection attachment, and the electric tool includes: an AC motor driven by a switch; and a host-side power supply path that is a path from the industrial power supply to the AC motor, the dust collection attachment being attached to the electric tool so as to collect dust generated when the electric tool is used, the dust collection attachment comprising: a suction unit; a dust collection part; a fan; a DC motor; a battery pack; and a dust-collecting-side power supply path which is a dust-collecting-side power supply path from the battery pack to the DC motor, and which is electrically separated from the host-side power supply path in a state in which the dust-collecting attachment is attached to the electric tool. The electric tool has an interlocking unit that drives the DC motor in conjunction with the operation of the switch in a state in which the interlocking unit is electrically separated from the signal path of the switch.

Description

Technical Field

[0001] The present disclosure relates to a dust collection system for an electric tool including an electric tool and a dust collection attachment. The dust collection attachment is mounted on the electric tool to collect dust generated when the electric tool is used. Background Art

[0002] When a power tool such as a hammer drill is used to process a workpiece such as concrete or stone, a dust collecting attachment is installed on the power tool to prevent dust generated from the workpiece from scattering. The dust collecting attachment, as disclosed in Japanese Patent No. 6211433, includes: a suction unit that sucks dust; a dust collecting unit that stores the sucked dust; and a dust collecting motor that has a fan that generates suction force.

[0003] The dust collecting accessory is installed on the main body of the power tool by sliding the outer shell of the dust collecting accessory, for example, from below. In the installed state, a male plug provided on the dust collecting accessory is inserted into and electrically connected to the female connector provided on the power tool. Industrial power is supplied to the power tool via the power cord. If the trigger is operated to turn on the switch, the drive motor is driven, and at the same time, the industrial power supplies power to the controller of the dust collecting accessory. The controller converts the supplied industrial power into direct current, and supplies it to the dust collecting motor, which is a DC motor, to drive the dust collecting motor. If the switch is disconnected, the power supply from the power tool to the controller stops, and the driving of the dust collecting motor also stops.

[0004] In the existing dust collection system for power tools, the power tool is electrically connected to the dust collection attachment, so that the DC motor of the dust collection attachment is linked to the on / off of the switch of the power tool. Therefore, the noise generated by the DC motor may reach the industrial power supply through the power supply path of the power tool. Therefore, it fails the EMI (Electromagnetic Interference) standard test and noise countermeasures need to be taken. Summary of the invention

[0005] An object of the present disclosure is to provide a dust collection system for an electric tool that can prevent noise generated in a DC motor of a dust collection attachment from propagating to a power supply path of the electric tool.

[0006] The first aspect of the present disclosure is a dust collection system for an electric tool, comprising an electric tool and a dust collection accessory, the electric tool comprising: an AC motor driven by a switch; and a main engine side power supply path, which is a path from an industrial power supply to the AC motor, the dust collection accessory being a dust collection accessory installed on the electric tool in order to collect dust generated when the electric tool is used, and comprising: a suction section; a dust collection section that captures dust sucked from the suction section; a fan that causes the suction section to generate a suction force; a DC motor that rotates the fan; a battery pack that serves as a power source for the DC motor; and a dust collection side power supply path, which is a dust collection side power supply path from the battery pack to the DC motor, and when the dust collection accessory is installed on the electric tool, the dust collection side power supply path is electrically separated from the main engine side power supply path, and the electric tool has a linkage unit, which drives the DC motor in linkage with the operation of the switch while the linkage unit is electrically separated from the signal path of the switch.

[0007] According to the present disclosure, it is possible to prevent the noise generated in the DC motor of the dust collecting attachment from being propagated to the power supply path of the electric power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a central longitudinal section view of a dust collection system for an electric tool.

[0009] Figure 2 yes Figure 1 Enlarged view of the left half of the AA line portion.

[0010] Description of Reference Numerals

[0011] 1... hammer drill; 2... inner housing; 3... motor housing; 4... upper outer housing; 5... lower outer housing; 6... impact mechanism; 7... motor; 8... rotating shaft; 11... front barrel; 12... handle; 13... main machine side controller; 20... power cord; 21... main switch; 22... sub-switch; 24... main wire; 27... sub-wire; 29... female connector; 30... switch lever; 35... tool holder; 44... piston; 48... striker; 49... impact bolt; 60... dust collection attachment; 61... housing; 62... main body; 65... dust collection box; 71... hook plate; 78... male connector; 83... filter; 92... dust collection motor; 94... dust collection fan; 96... dust collection side controller; 97... signal wire; 101... battery pack; 103... power wire; B... drill bit; R... dust collection path; S... dust collection system for electric tool. DETAILED DESCRIPTION

[0012] Hereinafter, embodiments of the present disclosure will be described based on the drawings.

[0013] Figure 1 1 is a central longitudinal sectional view showing an example of a dust collection system for an electric tool (hereinafter simply referred to as a "dust collection system") S. The dust collection system S is formed by attaching a dust collection attachment 60 to a hammer drill (electric tool) 1.

[0014] The hammer drill 1 includes an inner housing 2, a motor housing 3, an upper outer housing 4, and a lower outer housing 5 as housings. The inner housing 2 accommodates an impact mechanism 6 extending in the front-rear direction. The motor housing 3 is connected to the lower side of the inner housing 2. The motor housing 3 accommodates a motor (AC motor) 7. The motor 7 is held in the motor housing 3 in a posture in which the rotating shaft 8 is upward. The upper part of the rotating shaft 8 is supported by a bearing 9 held by the inner housing 2. The rotating shaft 8 has a pinion 10 at the upper end. The pinion 10 protrudes into the inner housing 2.

[0015] The upper outer case 4 covers the outer side of the inner case 2 at the upper side of the motor case 3 .

[0016] The lower outer shell 5 has a front cylinder portion 11 and a handle portion 12. The front cylinder portion 11 covers the outer side of the motor housing 3 from below. A host-side controller 13 having a control circuit substrate (not shown) is accommodated in the front cylinder portion 11 on the rear side of the motor housing 3 in the up-down direction. A front guide groove 14 is formed on the front surface of the front cylinder portion 11 and in the center in the left-right direction. The front guide groove 14 extends in the up-down direction. An upper locking recess 15 for mounting the dust collection accessory 60 is formed in front of the upper side of the front guide groove 14. Figure 2 As shown, horizontal locking recesses 16 for mounting the dust collecting attachment 60 are formed on the left and right sides of the front cylinder 11. A pair of horizontal guide grooves 17 are formed in front and behind the horizontal locking recesses 16. Each horizontal guide groove 17 extends upward from the lower end of the front cylinder 11.

[0017] The handle portion 12 extends rearward from the lower portion of the front tube portion 11 , and then extends upward to be connected to the rear end of the upper outer housing 4 .

[0018] A power cord 20 is connected to the lower part of the handle portion 12. The power cord 20 is electrically connected to the host-side controller 13. A main switch (switch) 21 and a sub-switch (second switch) 22 are provided above the power cord 20 and in the handle portion 12. The main switch 21 causes the plunger 23 to protrude forward. A main conductor (signal path) 24 is connected to the main switch 21. The main conductor 24 is electrically connected to the host-side controller 13. The main conductor 24 can input an on signal accompanying the downward pressure of the plunger 23 to the host-side controller 13. The power path from the power cord 20 via the host-side controller 13 to the motor 7 is an example of a host-side power path from the industrial power supply of the present disclosure to the AC motor and a host-side power path from the industrial power supply of the present disclosure to the AC motor via the host-side controller.

[0019] The sub-switch 22 projects the plunger 25 forward. The sub-switch 22 has a rod 26 at the front. The sub-conducting wire 27 is connected to the sub-switch 22. The sub-conducting wire 27 passes between the main switch 21 and the inner surface of the handle 12 and is led downward in the handle 12.

[0020] A connection port 28 opening downward is provided on the lower surface of the front tube portion 11 of the lower outer case 5 and below the host controller 13. A female connector 29 is provided downwardly from the connection port 28. The sub-lead wire 27 is connected to the female connector 29.

[0021] A switch lever 30 is provided in front of the main switch 21 and the auxiliary switch 22. The switch lever 30 is provided on the handle portion 12. The switch lever 30 can swing forward and backward with the lower end as the center. In a normal state, the plunger 23 of the main switch 21 abuts against the switch lever 30, and the switch lever 30 is in a protruding posture protruding forward from the handle portion 12. A pressing portion 31 is provided on the switch lever 30 at an upper side than the abutting portion of the plunger 23. The pressing portion 31 is located in front of the rod 26 of the auxiliary switch 22.

[0022] When the switch lever 30 is pushed backward from the protruding position, the plunger 23 is pushed down to turn on the main switch 21, and the pressing portion 31 pushes down the plunger 25 via the rod 26 to turn on the sub-switch 22. However, by setting the length of the pressing portion 31, the sub-switch 22 is turned on earlier than the main switch 21.

[0023] The impact mechanism part 6 has a tool holder 35. The tool holder 35 is held rotatably on the front side of the inner housing 2. The tool holder 35 is cylindrical and extends in the front-to-back direction. An intermediate shaft 36 is supported in the inner housing 2 and in the front side of the rotating shaft 8. The intermediate shaft 36 extends in the up-down direction. A crankshaft 37 is supported in the inner housing 2 and in the rear side of the rotating shaft 8. The crankshaft 37 extends in the up-down direction. A gear 38 is provided on the intermediate shaft 36. A gear 39 is provided on the crankshaft 37. The gear 38 and the gear 39 mesh with the pinion 10 of the rotating shaft 8. The intermediate shaft 36 has a first bevel gear 40 at the upper end.

[0024] A switching sleeve 41 is spline-coupled to the tool holder 35. Behind the switching sleeve 41 and at the rear end of the tool holder 35, a second bevel gear 42 is rotatably mounted. The second bevel gear 42 meshes with the first bevel gear 40 of the intermediate shaft 36. The switching sleeve 41 is engaged at the retracted position, so that the second bevel gear 42 transmits the rotation of the first bevel gear 40 to the tool holder 35. The front and rear positions of the switching sleeve 41 can be switched by a switching knob 51. The switching knob 51 is provided on the rear surface of the upper outer housing 4.

[0025] A cylinder 43 is held in the rear portion of the inner housing 2. The cylinder 43 is coaxially inserted into the rear portion of the tool holder 35. A piston 44 is housed in the cylinder 43 so as to be movable forward and backward. An eccentric pin 45 is protrudingly provided on the upper portion of the crankshaft 37. The piston 44 and the eccentric pin 45 are connected by a connecting rod 46. A striker 48 that is movable forward and backward is housed in the cylinder 43 and in front of the piston 44 via an air chamber 47. An impact bolt 49 is provided in front of the impactor 48 and in the tool holder 35. The impact bolt 49 is abutted against the drill bit B inserted into the front end of the tool holder 35. An operating sleeve 50 is mounted on the front of the tool holder 35. The operating sleeve 50 is used for performing disassembly and assembly operations on the drill bit B.

[0026] In the hammer drill 1, if the switch lever 30 is pressed down, the main switch 21 is turned on. If the main controller 13 receives the on signal of the main switch 21 via the main conductor 24, it supplies power to the motor 7 to rotate the rotating shaft 8. In this way, the crankshaft 37 rotates, and the piston 44 moves forward and backward via the connecting rod 46. Therefore, the linked impactor 48 impacts the drill bit B via the impact bolt 49. If the switching sleeve 41 is switched to the retracted position by operating the switching knob 51, it becomes the hammer drill mode. In the hammer drill mode, the rotation is transmitted from the intermediate shaft 36 to the tool holder 35 via the second bevel gear 42. If the switching sleeve 41 is switched to the forward position, it becomes the hammer mode. In the hammer mode, the tool holder 35 does not rotate but only impacts.

[0027] Next, the dust collecting attachment 60 will be described.

[0028] The dust collecting attachment 60 has a box-shaped housing 61. The housing 61 has a main body 62, a front protrusion 63, and a rear protrusion 64. The main body 62 extends in the up-down direction. The front protrusion 63 extends forward from the upper part of the main body 62. The dust collecting box 65 can be detached from the front side of the main body 62 and the lower side of the front protrusion 63. The rear protrusion 64 extends rearward from the lower part of the main body 62. The main body 62 and the rear protrusion 64 can be mounted on the hammer drill 1.

[0029] An upper locking projection 66 is formed on the upper surface of the main body 62 facing upward. The upper locking projection 66 can be inserted into the upper locking recess 15 provided in the front cylinder 11 of the hammer drill 1.

[0030] A locking plate 67 is provided in the upper rear surface of the main body 62 in the up-down direction. The locking plate 67 can be locked with the front guide groove 14 provided on the front surface of the front tube 11.

[0031] A pair of side plates 68 are provided on both sides from the rear surface of the main body 62 to the upper surface of the rear protruding portion 64. The front cylinder 11 of the hammer drill 1 can be fitted between the pair of side plates 68 from above. A pair of front and rear protrusions 69 are formed on the inner surface of each side plate 68. The pair of protrusions 69 can be fitted into a pair of lateral guide grooves 17 provided on the side surface of the front cylinder 11.

[0032] A recess 70 extending in the up-down direction is formed on the outer surface of each side plate 68. A hook plate 71 is accommodated in the recess 70. The hook plate 71 is a strip plate that fits into the recess 70 and extends in the up-down direction. Figure 2 As shown in FIG. 1 , the inner side of the middle portion of the hook plate 71 is coupled in the recess 70 in a manner that allows rotation around a shaft 72 extending in the front-rear direction. The lower portion of the hook plate 71 is pressed toward the left and right sides by a coil spring 73 provided between the hook plate 71 and the inner surface of the recess 70. Figure 2 As shown by the solid line in the middle, the hook plate 71 is in a locked position where the upper portion is forced to the left and right inner sides. A locking claw 74 is provided at the upper end of the hook plate 71 and protrudes inward. In the locked position, the locking claw 74 passes through the through hole 75 provided in the recess 70 and protrudes inwardly of the side plate 68. The locking claw 74 can be locked with the horizontal locking recess 16 of the front cylinder 11 when the dust collection attachment 60 is installed in the hammer drill 1. If the lower portion of the hook plate 71 is pressed toward the recess 70, as shown in FIG. Figure 2 As shown by the two-dot chain line, the hook plate 71 tilts toward the unlocking position where the locking claw 74 is away from the horizontal locking recess 16 .

[0033] A receiving portion 76 is provided on the upper surface of the rear protrusion 64. The receiving portion 76 abuts against the lower surface of the front tube portion 11 at the installation position of the dust collection accessory 60. A connecting tube 77 is provided to protrude upwardly from the upper surface of the rear protrusion 64 behind the receiving portion 76. The connecting tube 77 is located at the center of the left-right direction of the rear protrusion 64. The connecting tube 77 holds the male connector 78 facing upward. The connecting tube 77 is connected to the connection port 28 on the lower surface of the front tube portion 11 at the installation position of the dust collection accessory 60. Thus, the male connector 78 is connected to the female connector 29 of the connection port 28.

[0034] The front protrusion 63 is provided with a duct 80. The front end (suction portion) of the duct 80 opens forward at the front surface of the front protrusion 63. The duct 80 is led backward in the front protrusion 63 and turns around in the main body 62. The lower end of the duct 80 opens at the front surface of the main body 62 below the front protrusion 63.

[0035] The dust box (dust collecting part) 65 is a box-shaped body that is mounted on the housing 61 from the front under the front protrusion 63. The dust box 65 is formed by hingedly coupling a cover 81 and a box body 82 at the lower end. The cover 81 has a filter 83 on the front inner surface. The box body 82 covers the filter 83 from the front.

[0036] A locking shaft 84 extending in the left-right direction is provided at the lower end of the front surface of the main body 62. A receiving recess 85 extending in the left-right direction is formed on the lower surface of the box body 82. The receiving recess 85 is engaged with the locking shaft 84, and the elastic piece 86 provided at the upper end of the cover body 81 is locked to the lower surface of the front protrusion 63. Thus, the dust box 65 is detachably assembled to the housing 61. The cover body 81 has an inlet 87 on the upper side and an outlet 88 on the lower side. The inlet 87 is connected to the lower end of the pipeline 80. The outlet 88 is provided at the rear side of the filter 83.

[0037] A motor housing chamber 90 is partitioned and formed in the main body 62 behind the outlet 88. When the dust box 65 is installed, the outlet 88 contacts an opening 91 provided in front of the motor housing chamber 90 and is connected to the motor housing chamber 90.

[0038] A dust collecting motor (DC motor) 92 is housed in the motor housing chamber 90. The dust collecting motor 92 is held in a posture with a rotating shaft 93 facing downward. A dust collecting fan (fan) 94 is fixed to the rotating shaft 93. Exhaust ports (not shown) are formed on the left and right side surfaces of the main body 62 at the radially outer side of the dust collecting fan 94.

[0039] The positive and negative wires 95 connected to the dust collecting motor 92 pass through the partition between the main body 62 and the rear protrusion 64 and are led out into the rear protrusion 64. A dust collecting side controller 96 having a control circuit substrate (not shown) is provided in the rear protrusion 64. The wires 95 are electrically connected to the dust collecting side controller 96. The dust collecting side controller 96 is electrically connected to the male connector 78 via a signal wire 97.

[0040] A battery assembly portion 100 is provided at the rear protrusion 64. A battery pack 101 serving as a power source for the dust collection attachment 60 can be slidably assembled in the battery assembly portion 100 from the rear. A terminal block 102 is provided in the battery assembly portion 100. The terminal block 102 is a terminal block 102 electrically connected to the battery pack 101 assembled in the battery assembly portion 100. The terminal block 102 is electrically connected to the dust collection side controller 96 via a power supply lead 103. The power supply path from the battery pack 101 to the dust collection side controller 96 to the dust collection motor 92 is an example of a dust collection side power supply path from the battery pack to the DC motor of the present disclosure.

[0041] The dust collection side controller 96 is provided with a notification lamp (notification unit) 98. The notification lamp 98 is exposed on the side of the rear protrusion 64. The notification lamp 98 is, for example, an LED. If the battery pack 101 is mounted on the battery mounting portion 100, the dust collection side controller 96 monitors the remaining capacity of the battery pack 101. If the remaining capacity of the battery pack 101 becomes less than a predetermined threshold value, the dust collection side controller 96 lights or flashes the notification lamp 98 to notify that the remaining capacity is low.

[0042] With the rear protrusion 64 positioned below the front barrel 11 of the hammer drill 1, the dust collection attachment 60 is moved relative to the hammer drill 1 in the vertical direction while the protrusion 69 of the side plate 68 is matched with the lateral guide groove 17 of the front barrel 11 in the vertical direction. In this way, the protrusion 69 is fitted into the lateral guide groove 17 from below, and the upper locking protrusion 66 of the main body 62 is inserted into the upper locking recess 15 of the front barrel 11 from below. In addition, the locking plate 67 of the main body 62 is locked with the front guide groove 14 of the front barrel 11 from below.

[0043] At this time, the hook plate 71 of the side plate 68 interferes with the front cylinder 11 that moves relatively downward, and swings from the locked position to the unlocked position to allow the relative movement of the dust collecting attachment 60. Moreover, at the installation position of the dust collecting attachment 60, the locking claws 74 of each hook plate 71 that has returned to the locked position are respectively locked in the horizontal locking recessed portions 16 of the front cylinder 11. Therefore, the downward movement of the dust collecting attachment 60 relative to the hammer drill 1 is restricted, and the installation of the dust collecting attachment 60 is completed.

[0044] At the same time as the installation is completed, the connection tube 77 of the rear protrusion 64 is connected to the connection port 28 of the front tube 11 to connect the male connector 78 to the female connector 29. Therefore, the sub-switch 22 is electrically connected to the dust collection side controller 96 via the sub-conducting wire 27 and the signaling wire 97.

[0045] The drill bit B mounted on the hammer drill 1 is a dust suction drill having a dust suction path with a suction port opened at the front end of the axis and a hose mounting portion (not shown) mounted on the outer periphery. A flexible hose 105 is connected between the front end of the pipe 80 generating suction force in the dust collecting attachment 60 and the hose mounting portion.

[0046] Thus, a dust collection path R is formed in which air flows across the drill bit B and the dust collection attachment 60. Figure 1 As indicated by the dotted arrow, the dust collection path R is a path from the drill bit B to the exhaust port via the flexible hose 105, the pipe 80, the dust collection box 65, and the motor housing chamber 90.

[0047] When the dust collection system S is used for operation, the switch lever 30 is pressed down while the end of the drill bit B is pressed against the workpiece surface. Then, the sub-switch 22 is turned on first. The on signal of the sub-switch 22 is input to the dust collection side controller 96 via the sub-conductor 27 and the signal conductor 97. Then, the dust collection side controller 96 supplies the power of the battery pack 101 obtained from the terminal block 102 via the power conductor 103 to the dust collection motor 92 via the conductor 95. As a result, the dust collection motor 92 drives the rotating shaft 93 to rotate, so that the dust collection fan 94 rotates. In this way, the dust collection path R becomes a negative pressure, and a suction force is generated at the end opening of the drill bit B. The sub-switch 22, the sub-conductor 27, and the signal conductor 97 are an example of a linkage unit disclosed in the present invention. The sub-conductor 27 and the signal conductor 97 are an example of the second signal path disclosed in the present invention.

[0048] After the auxiliary switch 22 is turned on, the main switch 21 is turned on. The on signal of the main switch 21 is input to the main controller 13 via the main line 24. Then, the main controller 13 supplies the working power to the motor 7 from the industrial power supply obtained from the power line 20. As a result, the motor 7 is driven to rotate the rotating shaft 8, and the intermediate shaft 36 and the crank shaft 37 are rotated. Regardless of whether the hammer drill mode or the hammer mode is selected, the piston 44 always reciprocates. Therefore, the drill bit B is impacted via the impact bolt 49 through the linked impactor 48.

[0049] Dust generated from the workpiece is sucked into the dust suction path in the drill B and enters the pipe 80 through the flexible hose 105. The dust then passes through the dust collection path R and enters the dust collection box 65, is captured by the filter 83, and is stored in the box body 82.

[0050] Even if noise is generated in the dust collecting motor 92 during this operation, the dust collecting motor 92 is electrically isolated from the power path and signal path of the hammer drill 1. Therefore, there is no concern that the generated noise will propagate to the power path of the hammer drill 1.

[0051] When the operation is completed and the switch lever 30 is released from the pressing operation, the main switch 21 is turned off. As a result, the main machine controller 13 stops the power supply to the motor 7, and the operation of the hammer drill 1 stops.

[0052] On the other hand, when the pressing operation of the switch lever 30 is released, the dust collecting side controller 96 confirms that the auxiliary switch 22 is disconnected, waits for a preset delay time of several seconds, and stops the power supply to the dust collecting motor 92. Therefore, the dust remaining in the dust collecting path R when the hammer drill 1 stops working is stored in the dust collecting box 65.

[0053] When removing the dust collecting attachment 60 from the hammer drill 1, the lower parts of the left and right hook plates 71 are pressed down to move each hook plate 71 to the unlocked position. In this way, each locking claw 74 leaves the horizontal locking recess 16 of the front cylinder 11, allowing the relative movement of the dust collecting attachment 60. Therefore, the dust collecting attachment 60 is relatively moved in the separation direction from the hammer drill 1 in the opposite direction to when it was installed. In this way, the protrusion 69 of the side plate 68 is disengaged from the horizontal guide groove 17 of the front cylinder 11, and the locking plate 67 of the main body 62 is separated downward from the front guide groove 14. At the same time, the upper locking protrusion 66 of the main body 62 is pulled out from the upper locking recess 15 of the front cylinder 11. In this way, the removal of the dust collecting attachment 60 is completed.

[0054] When the dust accumulated in the dust box 65 is discarded, the elastic piece 86 is pressed to release the locking with the front protrusion 63. Then, if the dust box 65 is tilted forward with the locking shaft 84 as the center, the dust box 65 can be removed from the housing 61. The cover 81 can be opened to discard the dust accumulated inside the box body 82.

[0055] As described above, the dust collection system S includes the hammer drill 1, which is supplied with commercial power and includes the motor 7 driven by the main switch 21 using the switch lever 30. In addition, the dust collection system S includes the dust collection attachment 60, which is attached to the hammer drill 1 to collect dust generated when the hammer drill 1 is used. The dust collection attachment 60 includes a duct 80, a dust collection box 65 for capturing dust sucked from the duct 80, a dust collection fan 94 for generating a suction force in the duct 80, a dust collection motor 92 for rotating the dust collection fan 94, and a battery pack 101 for serving as a power source for the dust collection motor 92.

[0056] When the dust collecting attachment 60 is mounted on the hammer drill 1, the main power supply path from the power cord 20 to the motor 7 is electrically separated from the dust collecting side power supply path from the battery pack 101 to the dust collecting motor 92. A linkage unit (sub-switch 22, sub-conductor 27, signal conductor 97) is provided for driving the dust collecting motor 92 in linkage with the operation of the main switch 21 while being electrically separated from the signal path of the main switch 21.

[0057] This prevents the noise generated in the dust collecting motor 92 from being propagated to the power supply path of the hammer drill 1. Therefore, the EMI standard test can be passed, and there is no need to take noise countermeasures.

[0058] The hammer drill 1 includes a main controller 13 that controls the motor 7 in response to operation of the main switch 21. The power path from the commercial power supply via the main controller 13 to the motor 7 is electrically separated from the power path from the battery pack 101 to the dust collecting motor 92.

[0059] Therefore, even if the main machine-side controller 13 is present, it is possible to prevent the noise generated in the dust collecting motor 92 from being propagated to the power supply path of the hammer drill 1 .

[0060] The linkage unit comprises: a sub-switch 22, which is arranged on the hammer drill 1 separately from the main switch 21 and is operated along with the operation of the main switch 21; and a sub-conductor 27 and a signal conductor 97, which electrically connect the sub-switch 22 to the dust collection motor 92 when the dust collection attachment 60 is installed on the hammer drill 1.

[0061] Therefore, the dust collecting motor 92 can be linked to the operation of the main switch 21 while being securely separated from the signal path of the main switch 21 .

[0062] When the main switch 21 is turned on, the dust collecting motor 92 is driven and then the motor 7 is driven.

[0063] Therefore, by operating the dust collecting attachment 60 first to generate a suction force, dust can be surely sucked simultaneously with the operation of the hammer drill 1 .

[0064] When the main switch 21 is turned off, the motor 7 stops driving, and then the dust collecting motor 92 stops driving.

[0065] Therefore, the dust can be collected in the dust collecting box 65 so that the dust does not remain in the dust collecting path R after the hammer drill 1 stops operating.

[0066] The dust collection attachment 60 can be attached to and detached from the hammer drill 1 by being relatively moved in the up-down direction with respect to the hammer drill 1. When the dust collection attachment 60 is attached to the hammer drill 1, the dust collection attachment 60 is electrically connected to the hammer drill 1, and the interlocking unit can be operated.

[0067] Therefore, the dust collecting attachment 60 can be easily attached to and detached from the hammer drill 1 , and when the main switch 21 is operated in the attached state, the dust collecting attachment 60 automatically operates, making it easy to use.

[0068] A notification lamp 98 is provided to notify that the remaining capacity of the battery pack 101 has become less than a predetermined amount.

[0069] Therefore, the operator can quickly replace the battery pack 101 or charge the battery pack 101 .

[0070] The notification light 98 can be visually confirmed.

[0071] Therefore, the operator can easily grasp the decrease in the remaining capacity.

[0072] Hereinafter, modified examples of the present disclosure will be described.

[0073] Alternatively, the sub-switch forming the interlocking means may be provided not on the upper side of the main switch but on the lower side or the lateral side. The form of the sub-switch may also be changed appropriately.

[0074] The linkage unit is not limited to the structure using the auxiliary switch. For example, two electrically separated signal paths may be formed in one switch. Alternatively, in this case, the first signal path is connected to the host controller via the main conductor, and the second signal path is connected to the dust collection accessory via the auxiliary conductor.

[0075] In this case, the DC motor can also be linked to the operation of the switch while being securely separated from the signal path to the switch of the AC motor.

[0076] For the hammer drill, the position and orientation of the motor, the position and orientation of the host-side controller, and the connection position of the power cord are not limited to the embodiments. For example, the motor may also make the rotation axis be in a forward or oblique forward posture, and the host-side controller may also be facing sideways. The power cord may also be connected to the rear surface of the handle. The host-side controller may not exist.

[0077] The structure of the impact mechanism is not limited to the embodiment. The operation mode may be selectable as a drilling mode.

[0078] The power tool is not limited to a hammer drill, but may also be other power tools such as an electric hammer.

[0079] In the embodiment, a vacuum drill is used as the end tool mounted on the electric tool, but the end tool may not be a vacuum drill. In this case, another cylindrical accessory covering the outside of the end tool may be mounted on the end of the electric tool, and a hose mounting portion provided on the accessory may be connected to the suction portion of the dust collection accessory via a flexible hose.

[0080] The mounting direction of the dust collection attachment relative to the electric tool is not limited to the up-down direction. The mounting direction may be, for example, the front-back direction.

[0081] In the dust collection attachment, the position and orientation of the DC motor, the position and structure of the dust collection box are not limited to the embodiments. For example, the DC motor may be accommodated with the rotating shaft facing upward and sideways. Alternatively, the DC motor and the fan shaft may be different, and the rotation is transmitted from the rotating shaft of the DC motor to the shaft of the fan.

[0082] The dust collecting unit is not limited to a dust collecting box, and may be a dust separator structure without a filter. Therefore, the dust collecting path can be appropriately changed.

[0083] Alternatively, the battery pack may be mounted on the battery mounting portion by sliding from the side rather than from the rear. A plurality of battery packs may be mounted.

[0084] Alternatively, in the dust collecting accessory, the connection portion of the flexible hose is not the front surface of the housing, but other positions such as the upper surface or the side surface. The dust collecting accessory may not use a flexible hose. For example, the dust collecting accessory may have a cylindrical sliding portion that has a dust collecting path therein and protrudes from the housing, and a suction port for the end tool to pass through is provided at the end of the sliding portion.

[0085] The notification means is not limited to the lamp, and may display characters or numbers for notification, for example. Alternatively, the notification means may use sounds such as electronic sounds, or may use a lamp and sounds in combination.

Claims

1. A dust collection system for an electric tool, characterized in that: The dust collection system (S) for an electric tool comprises an electric tool (1) and a dust collection attachment (60). The electric tool (1) comprises: an AC motor (7) driven by a switch (21); and a host-side power supply path, which is a path from an industrial power supply (20) to the AC motor (7), The dust collecting accessory (60) is installed on the electric tool (1) and is used to collect dust generated when the electric tool (1) is used, and has: A suction portion (80); a dust collecting section (65) for capturing dust sucked from the suction section (80); a fan (94) which enables the suction portion (80) to generate a suction force; a DC motor (92) that rotates the fan (94); a battery pack (101) which serves as a power source for the DC motor (92); and a dust collection side power supply path, which is a dust collection side power supply path from the battery pack (101) to the DC motor (92), and when the dust collection accessory (60) is installed on the electric tool (1), the dust collection side power supply path is electrically separated from the main machine side power supply path, The electric tool (1) has a linkage unit (22, 27, 97) which drives the DC motor (92) in linkage with the operation of the switch (21) while being electrically separated from a signal path of the switch (21).

2. The dust collection system for an electric tool according to claim 1, characterized in that: The electric tool (1) has a main unit side controller (13), and the main unit side controller (13) controls the AC motor (7) in response to the operation of the switch (21). The main machine side power supply path from the commercial power supply (20) via the main machine side controller (13) to the AC motor (7) is electrically separated from the dust collection side power supply path.

3. The dust collection system for an electric tool according to claim 1 or 2, characterized in that: The linkage unit (22, 27, 97) has: a second switch (22) which is provided on the electric tool (1) separately from the switch (21) and is operated in conjunction with the operation of the switch (21); as well as A second signal path (27, 97) electrically connects the second switch (22) and the DC motor (92) when the dust collecting attachment (60) is mounted on the electric tool (1).

4. The dust collection system for an electric tool according to claim 1 or 2, characterized in that: The linkage unit has a second signal path, which is arranged separately from the signal path of the switch (21), and when the dust collection accessory (60) is installed on the electric tool (1), the switch (21) is electrically connected to the DC motor (92).

5. The dust collection system for an electric tool according to any one of claims 1 to 4, characterized in that: When the switch (21) is turned on, the DC motor (92) is driven and then the AC motor (7) is driven.

6. The dust collection system for an electric tool according to any one of claims 1 to 5, characterized in that: Accompanying the turning-off operation of the switch (21), the driving of the AC motor (7) is stopped and then the driving of the DC motor (92) is stopped.

7. The dust collection system for an electric tool according to any one of claims 1 to 6, characterized in that: The dust collecting attachment (60) can be attached to and detached from the electric tool (1) by moving relative to the electric tool (1) in the up-down direction. At the same time as the dust collection accessory (60) is mounted on the electric tool (1), the dust collection accessory (60) is electrically connected to the electric tool (1), so that the linkage unit (22, 27, 97) can operate.

8. The dust collection system for an electric tool according to any one of claims 1 to 7, characterized in that: The dust collection attachment (60) includes a notification unit (98) for notifying the battery pack (101) when the remaining capacity of the battery pack (101) becomes less than a predetermined amount.

9. The dust collection system for an electric tool according to claim 8, characterized in that: The notification unit (98) can be visually confirmed.

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