Dust collection system for electric tool

Abstract

Provided is a dust collection system for an electric tool. Even if the electric tool and the dust collection accessory respectively have batteries as power sources, the situation that any one of the batteries stops working due to the fact that the batteries are used up is prevented. A dust collection system for an electric tool includes an electric tool and a dust collection attachment, the electric tool includes a switch, a host-side DC motor, a host-side controller, and a host-side battery, and the dust collection attachment is attached to the electric tool and includes a suction unit, a dust collection unit, a fan, a dust collection-side DC motor, a dust collection-side controller, and a dust collection-side battery. The host-side controller is electrically connected to the dust-collecting-side controller in a state where the dust-collecting attachment is attached to the electric tool. The host-side battery and the dust-collecting-side battery can be individually used as power supplies for the host-side DC motor and the dust-collecting-side DC motor, respectively, by the dust-collecting-side controller.

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, in order to prevent dust generated from the workpiece from scattering, a dust collection attachment is installed on the power tool to form a dust collection system for the power tool, as disclosed in the specification of European Patent Application No. 3222386. The dust collection attachment includes: a suction unit that sucks dust; a dust collection unit that stores the sucked dust; and a dust collection motor that has a fan that generates suction force. Batteries that serve as power sources are provided on the power tool and the dust collection attachment, respectively.

[0003] In the existing dust collection system for electric tools, the electric tool and the dust collection accessory are driven by their own batteries as power sources. Therefore, if the remaining capacity of the battery is reduced to a level that the motor cannot drive, it cannot be used. Therefore, in the middle of the operation, the dust collection accessory stops working due to the exhaustion of the battery, and only the electric tool works, or, conversely, the electric tool stops working due to the exhaustion of the battery, and only the dust collection accessory continues to work, so the operation has to be interrupted. In addition, the efficiency of battery use is also reduced. Summary of the invention

[0004] An object of the present disclosure is to provide a dust collection system for an electric tool, which can prevent the operation of either of the electric tool and the dust collection attachment from stopping due to exhaustion of the battery, even if the electric tool and the dust collection attachment each have a battery as a power source.

[0005] 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: a switch; a host-side DC motor; a host-side controller, which controls the host-side DC motor based on the operation of the switch; and a host-side battery, the dust collection accessory is a dust collection accessory installed on the electric tool to collect dust generated when the electric tool is used, and comprises: a suction part; a dust collection part, which captures dust sucked from the suction part; a fan, which causes the suction part to generate a suction force; a dust collection side DC motor, which rotates the fan; a dust collection side controller, which controls the dust collection side DC motor; and a dust collection side battery, in the dust collection system for the electric tool, when the dust collection accessory is installed on the electric tool, the host-side controller is electrically connected to the dust collection side controller, and the host-side battery and the dust collection side battery can be used separately as power sources for the host-side DC motor and the dust collection side DC motor respectively through the host-side controller or the dust collection side controller.

[0006] According to the present disclosure, even if the electric tool and the dust collection attachment each have a battery as a power source, it is possible to prevent a situation in which either of the electric tools and the dust collection attachment stops operating due to exhaustion of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a central longitudinal section view of a dust collection system for an electric tool.

[0008] Figure 2 yes Figure 1 Enlarged view of the left half of the AA line portion.

[0009] Figure 3 This is a flow chart of the operation control of the dust collection system for electric tools.

[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... host side DC motor; 8... rotating shaft; 11... front cylinder; 12... handle; 13... host side controller; 18... switch; 21... switch lever; 23... female connector; 25... host side battery assembly; 26... host side battery pack; 29... host side notification light; 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 side DC motor; 94...dust collection fan; 96...dust collection side controller; 100...dust collection side battery assembly; 101...dust collection side battery pack; 104...dust collection side notification light; B...drill; R...dust collection path; S...dust collection system for electric tools. 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 S for an electric tool (hereinafter referred to as a “dust collection system”) formed by attaching a dust collection attachment 60 to a hammer drill 1 as an example of an electric tool.

[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 part of the inner housing 2 and accommodates a main machine-side DC motor 7. The main machine-side DC motor 7 is held in the motor housing 3 with a rotation shaft 8 facing upward. The upper part of the rotation shaft 8 is supported by a bearing 9 held by the inner housing 2. A pinion 10 provided at the upper end of the rotation shaft 8 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 housing 5 includes a front cylinder 11 and a handle 12. The front cylinder 11 covers the outer side of the motor housing 3 from below. A host controller 13 having a control circuit substrate (not shown) is accommodated in the rear side of the motor housing 3 and in the front cylinder 11 in the up-down direction. The host controller 13 includes a CPU mounted on the control circuit substrate and a memory connected to the CPU. The host controller 13 controls the operation of the hammer drill 1.

[0017] A front guide groove 14 is formed on the front surface of the front cylinder 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 collecting attachment 60 is formed at the upper front side of the front guide groove 14. Figure 2 As shown, a horizontal locking recess 16 for mounting the dust collecting attachment 60 is 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 recess 16. Each horizontal guide groove 17 extends upward from the lower end of the front cylinder 11.

[0018] 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 .

[0019] A switch 18 is provided in the handle 12. The switch 18 causes the plunger 19 to protrude forward. A host-side first lead wire 20 is connected to the switch 18. The host-side first lead wire 20 is electrically connected to the host-side controller 13. The host-side first lead wire 20 inputs an on signal generated in association with the downward pressure of the plunger 19 to the host-side controller 13.

[0020] A switch lever 21 is provided in front of the switch 18. The switch lever 21 is provided on the handle portion 12. The switch lever 21 can swing forward and backward with the lower end as the center. In a normal state, the plunger 19 of the switch 18 abuts against the switch lever 21, so that the switch lever 21 is in a protruding posture protruding forward from the handle portion 12. If the switch lever 21 is pressed backward from the protruding posture, the plunger 19 is pressed down and the switch 18 is turned on.

[0021] A connection port 22 opening downward is provided on the lower surface of the front cylinder 11 and below the host controller 13. A female connector 23 is provided downward at the connection port 22. A host second lead wire 24 is connected to the female connector 23. The host second lead wire 24 is electrically connected to the host controller 13.

[0022] A host-side battery mounting portion (host-side battery) 25 is provided at the lower portion of the handle portion 12. A host-side battery pack 26 serving as a power source is slidably mounted on the host-side battery mounting portion 25 from the rear.

[0023] A terminal block 27 is provided at the host-side battery assembly portion 25. The terminal block 27 is electrically connected to the assembled host-side battery pack 26. A host-side third wire 28 is connected to the terminal block 27. The host-side third wire 28 is electrically connected to the host-side controller 13. The host-side controller 13 receives power supply from the host-side battery pack 26 via the host-side third wire 28, and can obtain information related to voltage from the host-side battery pack 26. A host-side notification light (notification unit) 29 is provided at the host-side controller 13. The host-side notification light 29 is exposed on the side of the front tube 11. The host-side notification light 29 is, for example, an LED. If the voltage value obtained from the host-side battery pack 26 becomes less than a predetermined value pre-stored in the memory, the host-side controller 13 lights or flashes the host-side notification light 29 to notify the voltage drop.

[0024] The impact mechanism 6 has a tool holder 35. The tool holder 35 is held rotatably on the front side of the inner housing 2 and is cylindrical and extends in the front-to-back direction. An intermediate shaft 36 is supported in the inner housing 2 and in front of the rotating shaft 8. A crankshaft 37 is supported in the inner housing 2 and in the rear of the rotating shaft 8. The intermediate shaft 36 and the crankshaft 37 extend in the up-down direction, respectively. 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.

[0025] A switching sleeve 41 is spline-coupled to the tool holder 35. A second bevel gear 42 is rotatably mounted behind the switching sleeve 41 and at the rear end of the tool holder 35. The second bevel gear 42 meshes with the first bevel gear 40 of the intermediate shaft 36. The switching sleeve 41 engages with the second bevel gear 42 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 provided on the rear surface of the upper outer housing 4.

[0026] 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 is housed in the cylinder 43 and in front of the piston 44 via an air chamber 47 so as to be movable forward and backward. 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 for performing a disassembly operation on the drill bit B is mounted on the front portion of the tool holder 35.

[0027] If the switch lever 21 is pressed down, the switch 18 is turned on. The host side controller 13 receives the switch 18 on signal via the host side first wire 20. As a result, the host side controller 13 supplies power from the host side battery pack 26 to the host side DC motor 7, causing the rotating shaft 8 to rotate. 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 a 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 an electric hammer mode. In the electric hammer mode, the tool holder 35 does not rotate, but only impacts.

[0028] Next, the dust collecting attachment 60 will be described.

[0029] 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.

[0030] An upper locking projection 66 is formed upward at the center in the left-right direction on the upper surface of the main body 62. 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.

[0031] 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 cylinder 11.

[0032] 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 is 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. Each protrusion 69 is fitted into the horizontal guide groove 17 provided on the side surface of the front cylinder 11.

[0033] 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 to 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 forced to a locked position in which the upper portion tilts inwardly to the left and right. A locking claw 74 is provided at the upper end of the hook plate 71 and protrudes inwardly. In the locked position, the locking claw 74 passes through the through hole 75 provided in the recess 70 and protrudes inwardly to the side plate 68. The locking claw 74 can be locked with the horizontal locking recess 16 of the front cylinder 11 at the installation position of the dust collection attachment 60 to the hammer drill 1. If the lower portion of the hook plate 71 is pressed toward the recess 70, the hook plate 71 is locked as shown in FIG. Figure 2 As shown by the two-dot chain line in the middle, the locking claw 74 tilts toward the lock release position. At the lock release position, the locking claw 74 tilts toward the left and right outer sides of the side plate 68.

[0034] A receiving portion 76 is provided on the upper surface of the rear protrusion 64. At the installation position of the dust collecting accessory 60, the receiving portion 76 abuts against the lower surface of the front tube portion 11. Behind the receiving portion 76 and on the upper surface of the rear protrusion 64, a connecting tube 77 is provided to protrude upward. The connecting tube 77 is located in the center of the left-right direction of the rear protrusion 64 and keeps the male connector 78 facing upward. At the installation position of the dust collecting accessory 60, the connecting tube 77 is connected to the connecting port 22 on the lower surface of the front tube portion 11. As a result, the male connector 78 is connected to the female connector 23 of the connecting port 22.

[0035] 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 rear end of the duct 80 opens at the front surface of the main body 62 below the front protrusion 63.

[0036] 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 cover 81 and the box body 82 are hingedly coupled to each other 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.

[0037] 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, thereby, the dust box 65 is detachably assembled with respect to the housing 61. The cover body 81 has an inlet 87 on the upper side. The cover body 81 has an outlet 88 on the lower side. The inlet 87 is connected to the end of the lower side of the pipeline 80. The outlet 88 is provided at the rear side of the filter 83.

[0038] 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.

[0039] The motor housing chamber 90 houses a dust collecting DC motor 92. The dust collecting DC motor 92 is held in a posture with the 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.

[0040] The positive and negative first dust collecting side wires 95 are connected to the dust collecting side DC motor 92. The first dust collecting side wire 95 passes through the partition between the main body 62 and the rear protrusion 64 and is 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 dust collecting side controller 96 has a CPU mounted on the control circuit substrate and a memory connected to the CPU. The dust collecting side controller 96 controls the operation of the dust collecting attachment 60. The first dust collecting side wire 95 is electrically connected to the dust collecting side controller 96. The dust collecting side controller 96 is electrically connected to the male connector 78 via the second dust collecting side wire 97.

[0041] The dust collecting side battery assembly part 100 is provided at the rear protruding part 64. The dust collecting side battery pack (dust collecting side battery) 101 which is the power source of the dust collecting attachment 60 is slidably assembled to the dust collecting side battery assembly part 100 from the rear. The assembly structure of the dust collecting side battery pack 101 to the dust collecting side battery assembly part 100 is the same as the assembly structure of the main unit side battery pack 26 to the main unit side battery assembly part 25.

[0042] A terminal block 102 is provided in the dust collection side battery mounting portion 100. The terminal block 102 is electrically connected to the mounted dust collection side battery pack 101. The terminal block 102 is electrically connected to the dust collection side controller 96 via a dust collection side third lead wire 103.

[0043] The dust collecting side controller 96 is provided with a dust collecting side notification lamp (notification unit) 104. The dust collecting side notification lamp 104 is exposed on the side of the rear protrusion 64. The dust collecting side notification lamp 104 is, for example, an LED. If the dust collecting side battery pack 101 is mounted on the dust collecting side battery mounting portion 100, the dust collecting side controller 96 monitors the voltage of the dust collecting side battery pack 101. If the voltage value of the dust collecting side battery pack 101 becomes less than a predetermined value stored in advance, the dust collecting side controller 96 lights or flashes the dust collecting side notification lamp 104 to notify the voltage drop.

[0044] With the rear protrusion 64 positioned below the front barrel 11 of the hammer drill 1, 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. The dust collecting attachment 60 is moved relative to the hammer drill 1 in the vertical direction. In this way, the protrusion 69 is engaged with 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.

[0045] At this time, the hook plate 71 of the side plate 68 interferes with the front cylinder 11 that moves relatively downward, and the hook plate 71 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 returns to the locked position are respectively locked in the horizontal locking recessed portion 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.

[0046] At the same time as the installation of the dust collection attachment 60 is completed, the connection tube 77 of the rear protrusion 64 is connected to the connection port 22 of the front tube 11. As a result, the male connector 78 is connected to the female connector 23. Therefore, the host side controller 13 is electrically connected to the dust collection side controller 96 via the host side second wire and the dust collection side second wire.

[0047] The drill bit B mounted on the hammer drill 1 is a dust suction drill bit 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. Therefore, 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.

[0048] By connecting with the flexible hose 105, a dust collection path R is formed for air to flow 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.

[0049] The dust collection side controller 96, when electrically connected to the main unit side controller 13, determines the presence or absence of voltages of the main unit side battery pack 26 and the dust collection side battery pack 101, and selects the battery pack to be used based on the determination result to perform the operation control of the dust collection system S. The operation control is performed based on a program pre-stored in a non-transitory computer-readable storage medium including a memory connected to the CPU of the dust collection side controller 96.

[0050] In the operation control of the dust collection system S, the case where there is a voltage from the battery pack means that there is a voltage value (for example, 36V) sufficient to drive each DC motor 7, 92. In addition, the case where there is no voltage from the battery pack means that there is a voltage value (for example, 5V) required for the operation of the host side controller 13 or the dust collection side controller 96 although there is no voltage value sufficient to drive each DC motor 7, 92.

[0051] The following is based on Figure 3 The flowchart of the dust collection system S is explained.

[0052] First, in step S1, if it is confirmed that the switch 18 is turned on in association with the pressing operation of the switch lever 21, then in step S2, the dust collection side controller 96 determines whether there is a voltage from the dust collection side battery pack 101. If it is determined that there is a voltage from the dust collection side battery pack 101, then in step S3, it is determined whether there is a voltage from the main unit side battery pack 26. Here, if it is determined that there is a voltage from the main unit side battery pack 26, then in step S4, the power of the main unit side battery pack 26 is also supplied to the dust collection side controller 96 of the dust collection attachment 60. And, in step S5, only the power of the main unit side battery pack 26 is used to drive the main unit side DC motor 7 and the dust collection side DC motor 92, respectively, so that the hammer drill 1 and the dust collection attachment 60 are operated. Here, the main unit side battery pack 26 is preferentially used because the main unit side battery pack 26 has a larger capacity than the dust collection side battery pack 101.

[0053] The details of the operation of the hammer drill 1 and the dust collecting attachment 60 will be described.

[0054] The power usage instruction of the host side battery pack 26 is input from the dust collection side controller 96 to the host side controller 13 together with the on signal of the switch 18. In this way, the host side controller 13 supplies the power of the host side battery pack 26 to the dust collection side controller 96 via the host side second wire 24 and the dust collection side second wire 97. If the power is obtained from the dust collection side controller 96, the dust collection side DC motor 92 is driven, the rotating shaft 93 rotates, and the dust collection fan 94 rotates. In this way, the dust collection path R becomes negative pressure, and a suction force is generated at the end opening of the drill bit B.

[0055] The main machine controller 13 waits for a preset delay time of several seconds after receiving the on signal of the switch 18, and then supplies the power obtained from the main machine battery pack 26 to the main machine DC motor 7. Therefore, the main machine DC motor 7 is driven with a delay compared with the dust collecting DC motor 92, and the rotating shaft 8 rotates, so that the intermediate shaft 36 and the crank shaft 37 rotate. Here, regardless of which mode is selected, the piston 44 always reciprocates. Therefore, the drill bit B is impacted by the impact bolt 49 through the impactor 48 that is linked.

[0056] 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, where it is captured by the filter 83 and stored in the box body 82.

[0057] When the operation is completed and the pressing operation of the switch lever 21 is released, the switch 18 is turned off. When the main machine side controller 13 confirms that the switch 18 is turned off, it stops the power supply to the main machine side DC motor 7, so that the operation of the hammer drill 1 is stopped. In addition, the main machine side controller 13 sends a switch 18 off signal to the dust collection side controller 96. In this way, after confirming that the switch 18 is turned off, the dust collection side controller 96 waits for a preset delay time of several seconds to pass, and then stops the power supply to the dust collection side DC motor 92. Therefore, the dust remaining in the dust collection path R when the hammer drill 1 stops working is stored in the dust collection box 65.

[0058] The dust collecting side controller 96 ends the operation control after confirming the disconnection of the switch 18 in step S6 and executing the delayed stop of the dust collecting side DC motor 92. If the switch 18 is still connected in the determination of step S6, the control returns to step S2 to continue to confirm the presence or absence of the voltage of the two battery packs 26 and 101.

[0059] If the main unit battery pack 26 is used alone as the power source for the two DC motors 7 and 92 and the remaining capacity is low, it is determined in the determination of step S3 that there is no voltage from the main unit battery pack 26. Therefore, in step S7, the dust collection side controller 96 also supplies the power of the dust collection side battery pack 101 to the main unit controller 13 via the dust collection side second lead wire 97 and the main unit second lead wire 24. In step S8, the hammer drill 1 and the dust collection attachment 60 are operated only by the power of the dust collection side battery pack 101.

[0060] If it is confirmed in step S2 that there is no voltage from the dust collection side battery pack 101, then in step S9, it is determined whether there is voltage from the host side battery pack 26. If it is confirmed that there is voltage from the host side battery pack 26, then in step S10, the main body of operation control is switched to the host side controller 13.

[0061] In step S11, the main machine controller 13 also supplies the power of the main machine battery pack 26 to the dust collection controller 96. In step S12, the hammer drill 1 and the dust collection attachment 60 are operated only by the power of the main machine battery pack 26.

[0062] In step S9, if it is confirmed that there is no power supply from the host-side battery pack 26, there is no remaining capacity in any battery pack. Therefore, even if the switch 18 is turned on, the hammer drill 1 and the dust collection attachment 60 do not operate (step S13). Therefore, in step S14, the host-side controller 13 turns on or flashes the host-side notification lamp 29 and the dust collection-side notification lamp 104 to notify that the batteries of the two battery packs 26 and 101 are exhausted.

[0063] 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. Then, each locking claw 74 is disengaged from 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 can be relatively moved in the separation direction away 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.

[0064] When the dust accumulated in the dust box 65 is discarded, the elastic piece 86 is pressed to release the locking between the elastic piece 86 and 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. If the cover 81 is opened, the dust accumulated inside the box body 82 can be discarded.

[0065] The dust collection system S includes a hammer drill 1 , and the hammer drill 1 includes a switch 18 , a host-side DC motor 7 , a host-side controller 13 that controls the host-side DC motor 7 based on an operation of the switch 18 , and a host-side battery pack 26 .

[0066] In addition, the dust collection system S has a dust collection attachment 60, which is mounted on the hammer drill 1 and is used 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 side DC motor 92 for rotating the dust collection fan 94, a dust collection side controller 96 for controlling the dust collection side DC motor 92, and a dust collection side battery pack 101.

[0067] When the dust collection attachment 60 is mounted on the hammer drill 1, the main controller 13 is electrically connected to the dust collection controller 96. The main battery pack 26 and the dust collection battery pack 101 can be used as power sources for the main DC motor 7 and the dust collection DC motor 92 through the dust collection controller 96.

[0068] According to this structure, even if the hammer drill 1 and the dust collection attachment 60 each have a battery pack as a power source, it is possible to prevent one of them from stopping operation due to battery exhaustion. Therefore, the convenience of use is improved. In addition, the two battery packs 26 and 101 can be used up in sequence. Therefore, the use efficiency of the two battery packs 26 and 101 is also improved.

[0069] The dust collection-side controller 96 first uses the main unit-side battery pack 26 alone as a power source for the two DC motors 7 and 92, and then uses the dust collection-side battery pack 101 alone as a power source for the two DC motors 7 and 92 (steps S1 to S8).

[0070] Therefore, the main unit side battery pack 26 having a larger capacity than the dust collection side battery pack 101 can be used preferentially.

[0071] The dust collection side controller 96 monitors the voltages of the two battery packs 26 and 101 respectively. If the voltage value of a battery pack 26 (101) previously used alone as a power source for the two DC motors 7 and 92 becomes lower than a predetermined value that is unable to drive the two DC motors 7 and 92, the other battery pack 101 (26) is used as a power source for the two DC motors 7 and 92 (steps S1 to S12).

[0072] Therefore, the two battery packs 26 and 101 can be used separately according to the voltage value, and the operation stop caused by the exhaustion of the battery of one of them can be effectively prevented.

[0073] The dust collection side controller 96 determines to use the battery pack 26 (101) alone as the power source for the two DC motors 7, 92. If the voltage value of the battery pack 26 (101) becomes less than a predetermined value, the host side controller 13 determines to use the battery pack 101 (26) alone as the power source for the two DC motors 7, 92 (steps S10 to S12).

[0074] Therefore, while the use of the main unit battery pack 26 is suppressed, the operation control of the dust collection system S can be continued even if the voltage value of the dust collection side battery pack 101 decreases.

[0075] The main machine side battery pack 26 can be detached from the main machine side battery assembly part 25 provided on the hammer drill 1. The dust collection side battery pack 101 can be detached from the dust collection side battery assembly part 100 provided on the dust collection attachment 60. The detachable structure between the main machine side battery assembly part 25 and the main machine side battery pack 26 is the same as the detachable structure between the dust collection side battery assembly part 100 and the dust collection side battery pack 101.

[0076] Therefore, if the rated voltages are the same, both battery packs 26 and 101 can be mounted on the hammer drill 1 and the dust collecting attachment 60 , thereby improving the usability.

[0077] The dust collection-side controller 96 drives the dust collection-side DC motor 92 first and then drives the main unit-side DC motor 7 in response to the switch 18 being turned on.

[0078] Therefore, the dust collecting attachment 60 can be operated first to generate a suction force, and dust can be surely sucked simultaneously with the work performed by the hammer drill 1 .

[0079] The dust collection-side controller 96 stops driving the dust collection-side DC motor 92 after the main unit-side DC motor 7 stops driving in response to the OFF operation of the switch 18 .

[0080] 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.

[0081] A host-side notification lamp 29 and a dust collection-side notification lamp 104 are provided to notify that the voltage of the host-side battery pack 26 and the dust collection-side battery pack 101 has fallen below a predetermined value.

[0082] Therefore, the operator can quickly replace the two battery packs 26 and 101 and charge the two battery packs 26 and 101.

[0083] Hereinafter, modified examples of the present disclosure will be described.

[0084] In the above working control, the battery pack on the main engine side is first used as the power source for the two DC motors alone, and then the battery pack on the dust collection side is used as the power source for the two DC motors alone. However, it can also be the opposite, that is, the battery pack on the dust collection side is first used as the power source for the two DC motors alone, and then the battery pack on the main engine side is used as the power source for the two DC motors alone.

[0085] In this case, it is possible to suppress a decrease in the remaining capacity of the battery pack on the host side and ensure power supply when the hammer drill is used alone.

[0086] In the above-mentioned working control, a judgment of no voltage is made when the voltage value in the two battery packs is not sufficient to drive the two DC motors, but it may also be that the main engine side controller or the dust collection side controller makes a judgment of no voltage when either of the two battery packs is not installed in the battery installation part, and uses the other battery pack alone as the power source for the two DC motors.

[0087] In this case, the entire system can be operated by assembling only one battery pack, further improving the convenience of use.

[0088] Furthermore, the determination of the battery pack used as the sole power source is not limited to the determination based on the voltage value of the battery pack. For example, a detection unit such as a sensor or a switch for detecting the installation of a battery pack may be provided in each battery installation section, and the battery pack used as the sole power source may be determined based on the determination of whether a battery pack is installed.

[0089] In the hammer drill, the position and orientation of the host side DC motor and the position and orientation of the host side controller are not limited to the above embodiments. For example, the host side DC motor may also have its rotation axis facing forward or obliquely forward, and the host side controller may also face sideways.

[0090] The position of the host side battery assembly part can also be changed appropriately. Alternatively, the host side battery pack can be slid and assembled from the front or the side instead of from the rear. In the case where two host side battery packs are assembled, the two host side battery packs can be used as one host side battery separately from the dust collection side battery.

[0091] The host-side battery of the present disclosure is not limited to a detachable structure like the host-side battery pack of the above-mentioned embodiment. For example, the host-side battery may be held in a non-detachable manner relative to the housing of the electric tool and may be charged via a cable.

[0092] The structure of the impact mechanism is not limited to the above-mentioned embodiment. The operation mode may be selectable as an electric drill mode.

[0093] The power tool is not limited to a hammer drill, but may also be other power tools such as an electric hammer.

[0094] In the above embodiment, a dust suction drill is used as the end tool mounted on the electric tool, but the end tool may not be a dust suction 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.

[0095] The mounting direction of the dust collection accessory relative to the electric tool is not limited to the up-down direction. The mounting direction may be, for example, the front-back direction.

[0096] In the dust collection accessory, the position and orientation of the DC motor on the dust collection side, the position and structure of the dust collection box are not limited to the above-mentioned embodiments. For example, the DC motor on the dust collection side may be accommodated with the rotating shaft facing upward and sideways. Alternatively, the DC motor on the dust collection side may be independent of the shaft of the fan, and the rotation is transmitted from the rotating shaft of the DC motor on the dust collection side to the shaft of the fan.

[0097] 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 changed appropriately.

[0098] The dust collecting side battery pack may be mounted to the dust collecting side battery mounting portion by sliding from the front or side instead of sliding from the rear.

[0099] The dust collecting side battery of the present disclosure is not limited to a detachable structure like the dust collecting side battery pack of the above embodiment. For example, the dust collecting side battery may be held in a non-detachable manner relative to the housing of the dust collecting attachment and may be charged via a cable.

[0100] Alternatively, in the dust collection accessory, the connection portion of the flexible hose is not on the front surface of the housing, but on the upper surface, side surface, or other position. The dust collection accessory may also be a structure that does not use a flexible hose. For example, the dust collection accessory may have a cylindrical sliding portion that has a dust collection path 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.

[0101] 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: Switch (18); Host side DC motor (7); a host-side controller (13) that controls the host-side DC motor (7) based on the operation of the switch (18); and Host side battery (26), 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 dust collection side DC motor (92) which rotates the fan (94); A dust collecting side controller (96) for controlling the dust collecting side DC motor (92); and Dust collecting side battery (101), When the dust collection accessory (60) is installed on the electric tool (1), the host side controller (13) is electrically connected to the dust collection side controller (96). The host side controller (13) or the dust collection side controller (96) can use the host side battery (26) and the dust collection side battery (101) as power sources for the host side DC motor (7) and the dust collection side DC motor (92) respectively.

2. The dust collection system for an electric tool according to claim 1, characterized in that: The host side controller (13) or the dust collection side controller (96) first uses the host side battery (26) alone as the power source for the host side DC motor (7) and the dust collection side DC motor (92), and then uses the dust collection side battery (101) alone as the power source for the host side DC motor (7) and the dust collection side DC motor (92).

3. The dust collection system for an electric tool according to claim 1, characterized in that: The host side controller (13) or the dust collection side controller (96) first uses the dust collection side battery (101) alone as the power source for the host side DC motor (7) and the dust collection side DC motor (92), and then uses the host side battery (26) alone as the power source for the host side DC motor (7) and the dust collection side DC motor (92).

4. The dust collection system for an electric tool according to any one of claims 1 to 3, characterized in that: The host side controller (13) or the dust collecting side controller (96) monitors the voltage of the host side battery (26) and the dust collecting side battery (101) respectively. If the voltage value of one of the host side battery (26) and the dust collecting side battery (101) previously used alone as the power source of the host side DC motor (7) and the dust collecting side DC motor (92) becomes below a predetermined value that is unable to drive the host side DC motor (7) and the dust collecting side DC motor (92), the other of the host side battery (26) and the dust collecting side battery (101) is used alone as the power source of the host side DC motor (7) and the dust collecting side DC motor (92).

5. The dust collection system for an electric tool according to claim 4, characterized in that: The dust collection side controller (96) determines that either the main unit side battery (26) or the dust collection side battery (101) is a battery used alone as a power source for the main unit side DC motor (7) and the dust collection side DC motor (92). If the voltage value of the dust collecting side battery (26) becomes lower than the predetermined value, the host side controller (13) determines either the host side battery (26) or the dust collecting side battery (101) as a battery to be used alone as a power source for the host side DC motor (7) and the dust collecting side DC motor (92).

6. The dust collection system for an electric tool according to any one of claims 1 to 5, characterized in that: The electric tool (1) has a main body side battery assembly portion (25) capable of detachably assembling the main body side battery (26). The dust collecting attachment (60) has a dust collecting side battery assembly portion (100) capable of detachably assembling the dust collecting side battery (101). The assembly and disassembly structure between the main machine side battery assembly part (25) and the main machine side battery (26) is the same as the assembly and disassembly structure between the dust collection side battery assembly part (100) and the dust collection side battery (101).

7. The dust collection system for an electric tool according to claim 6, characterized in that: When the host side battery (26) or the dust collecting side battery (101) is not mounted on the host side battery mounting portion (25) or the dust collecting side battery mounting portion (100), the host side controller (13) or the dust collecting side controller (96) also uses the other of the host side battery (26) or the dust collecting side battery (101) separately as the power source for the host side DC motor (7) and the dust collecting side DC motor (92).

8. The dust collection system for an electric tool according to any one of claims 1 to 7, characterized in that: When the switch (18) is turned on, the host side controller (13) or the dust collection side controller (96) first drives the dust collection side DC motor (92) and then drives the host side DC motor (7).

9. The dust collection system for an electric tool according to any one of claims 1 to 8, characterized in that: Accompanying the disconnection operation of the switch (18), the main unit side controller (13) or the dust collection side controller (96) stops driving the main unit side DC motor (7) and then stops driving the dust collection side DC motor (92).

10. The dust collection system for an electric tool according to claim 4 or 5, characterized in that: The invention also comprises a notification unit (29, 104) for notifying the situation when the voltage of the main unit side battery (26) and the dust collection side battery (101) becomes less than the predetermined value.

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