Impact tool and dust collection system

Abstract

Small size is maintained even if a dust collecting fan is provided. An electric hammer drill (1) includes a housing (2) to which a dust collecting attachment can be attached, and an impact mechanism section (20) provided inside the housing (2) and capable of impacting a drill bit attached to a front end by a reciprocating striker (33). In addition, the electric hammer drill (1) includes a motor (6) configured inside the housing (2) so that a rotation shaft (7) intersects an impact axis direction of the impact mechanism section (20), and a dust collecting fan (51) provided to the rotation shaft (7). Furthermore, the dust collecting fan (51) is disposed on a lower side of the motor (6).

Description

Technical Field

[0001] This invention relates to impact tools such as electric hammer drills, and a dust collection system formed by connecting dust collection accessories to the impact tools. Background Technology

[0002] There are instances where impact tools such as hammer drills are equipped with dust collection accessories to collect and store dust generated from the workpiece material during drilling operations. As a dust collection system comprised of this impact tool and the dust collection accessory, for example, Patent Document 1 discloses an invention in which a dust collection fan is mounted on the motor shaft of the impact tool, and the airflow path inside the dust collection device (dust collection accessory) is connected to the airflow path inside the impact tool. In this dust collection system, when the dust collection fan is rotated by the motor, air drawn in from the suction port facing the tool tip passes through the dust collection box inside the dust collection device, whereby dust can be captured and stored using a filter inside the dust collection box. The air that has passed through the filter enters the airflow path inside the impact tool and is discharged to the outside through an exhaust port provided in the housing of the impact tool.

[0003] Patent Document 1: Japanese Patent No. 6803242

[0004] In the aforementioned existing impact tools, a dust collection fan is positioned above the motor shaft, which extends vertically. Therefore, the outer diameters of the motor housing and the dust collection fan correspondingly increase radially, resulting in miniaturized damage. Summary of the Invention

[0005] Therefore, the object of the present invention is to provide an impact tool and a dust collection system that can maintain a miniaturized design even when a dust collection fan is installed.

[0006] To achieve the above objectives, the present invention provides an impact tool, characterized in that it comprises:

[0007] The housing, which allows for the installation of dust collection accessories;

[0008] An impact mechanism is provided inside the aforementioned housing and is capable of impacting a pointed tool mounted at the front end via a reciprocating impact member.

[0009] A motor, which is configured within the aforementioned housing such that its rotation axis intersects the impact axis direction of the aforementioned impact mechanism; and

[0010] The dust collection fan is mounted on the aforementioned rotating shaft.

[0011] The aforementioned dust collection fan is located below the aforementioned motor.

[0012] To achieve the above objectives, the present invention provides a dust collection system, characterized in that it comprises:

[0013] The aforementioned impact tools; and

[0014] The aforementioned dust collection accessory has an intake port relative to the aforementioned pointed tool and is installed in the aforementioned housing. The suction force is generated at the aforementioned intake port by the rotation of the aforementioned dust collection fan.

[0015] According to the present invention, the dust collection fan is disposed below the motor, so it is not necessary for the motor housing to radially increase in size corresponding to the outer diameter of the dust collection fan. Therefore, even with the dust collection fan, the miniaturization of the impact tool can be maintained. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of a hammer drill from below.

[0017] Figure 2 This is a side view of a hammer drill.

[0018] Figure 3 This is a top view of a hammer drill.

[0019] Figure 4 This is a central longitudinal sectional view of an electric hammer drill.

[0020] Figure 5 yes Figure 4 Enlarged view of the motor housing and fan housing.

[0021] Figure 6 yes Figure 5 A partial sectional view of line AA.

[0022] Figure 7 yes Figure 5 A partial sectional view of the BB line.

[0023] Figure 8 This is an exploded 3D view of the fan storage compartment from above.

[0024] Figure 9 This is an exploded 3D view of the fan storage compartment from below.

[0025] Figure 10 yes Figure 5 A partial sectional view of the CC line.

[0026] Figure 11 This is a three-dimensional view of the dust collection accessories viewed from the rear.

[0027] Figure 12 This is a side view of the dust collection accessory.

[0028] Figure 13 This is a top view of the dust collection accessory.

[0029] Figure 14 This is a central longitudinal sectional view of the dust collection accessory.

[0030] Figure 15 yes Figure 13 DD-line sectional view.

[0031] Figure 16 This is an explanatory diagram showing the installation position of the dust collection accessory when it is installed on the electric hammer drill (the dust collection accessory and a part of the electric hammer drill are shown through the central longitudinal section).

[0032] Figure 17 This is a side view of the installation portion of the dust collection accessories in the dust collection system.

[0033] Figure 18 This is a central longitudinal sectional view of the dust collection system.

[0034] Explanation of reference numerals in the attached figures

[0035] 1…hammer drill; 2…housing; 3…main body housing; 3c…upper air intake; 4…rear housing; 5…front housing; 6…motor; 7…rotary shaft; 16…rear cylinder; 17…front cylinder; 20…impact mechanism; 21…intermediate shaft; 22…tool retainer; 27, 39…bearings; 35…motor housing; 38…bearing retainer; 42…upper engaging part; 43…engaging groove; 45…fan storage part; 46…upper plate; 47…rear plate; 48…dual fans; 50…motor cooling fan; 51…dust collection fan; 54…upper vent; 55…lower engaging part; 58…side exhaust port; 60…baffle; 69…partition wall; 70… Bottom exhaust port; 73…cap; 74…opener / closer; 75…coil spring; 77…lower intake port; 90…dust collection accessories; 91…outer shell; 92…main body; 93…dust collection box; 94…protrusion; 95…sliding part; 106…intake port; 110…filter; 117…exhaust port; 118…rubber cap; 122…pin; 123…clamping guide rail; 124…arm; 125…upper protrusion; 126…lower protrusion; 131…hook plate; B…drill bit; R1…motor cooling flow path; R2…machine side dust collection flow path; R3…branch flow path; R4…accessory side dust collection flow path; A1…upper space; A2…lower space; S…dust collection system. Detailed Implementation

[0036] In one embodiment of the invention, a motor cooling fan may also be provided on the rotating shaft, and this motor cooling fan is adjacent to the dust collection fan in the axial direction of the rotating shaft. According to this structure, even if a motor cooling fan is provided on top of the dust collection fan, it is not necessary to increase the radial size of the motor housing, thereby maintaining miniaturization.

[0037] In one embodiment of the invention, the air intake port, which draws in air by the rotation of the dust collection fan, can also be located on the lower surface of the housing. With this structure, foreign matter such as dust is less likely to enter through the air intake port, thereby ensuring a wider opening area.

[0038] In one embodiment of the invention, the exhaust port for discharging air by the rotation of the dust collection fan can also be provided on the lower surface of the housing. With this structure, foreign matter such as dust is difficult to intrude from the exhaust port, thereby ensuring a relatively wide opening area.

[0039] In one embodiment of the invention, a second exhaust port for discharging air by the rotation of the dust collection fan can also be provided on the side of the housing. This structure ensures the required airflow.

[0040] In one embodiment of the invention, the air intake can also be opened and closed by a disc-shaped opener / closer. According to this structure, even with an air intake, the dustproof and waterproof properties of the impact tool can be ensured.

[0041] In one embodiment of the invention, the switch can also be configured coaxially with the dust collection fan. This configuration allows for a compact arrangement of the switch. Furthermore, airflow becomes smoother when the switch is open.

[0042] In one embodiment of the invention, the left-right width of the dust-collecting fan housing portion in the housing may also be greater than the left-right width of the motor housing portion in the housing. According to this structure, the motor housing portion becomes slimmer, thus improving the appearance.

[0043] In one embodiment of the invention, the bearing supporting the rotating shaft within the housing may also be positioned higher than the dust collection fan. According to this structure, the motor housing, including the bearing portion, can also be kept compact.

[0044] In one embodiment of the invention, the dust collection accessory can also slide relative to the housing in a predetermined linear direction, thereby enabling installation by interlocking a convex engaging portion provided on one side of the housing and a concave engaging portion provided on the other side. The convex or concave engaging portions provided on the housing are configured to be separated into multiple parts in a linear direction. According to this structure, the dust collection accessory can be installed securely even without making the convex and concave engaging portions longer. Therefore, it is not necessary to change the shape of the housing, thus maintaining miniaturization and lightweight design.

[0045]

Example

[0046] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0047] (Instructions for using a hammer drill)

[0048] Figure 1 This is a perspective view of a hammer drill, an example of an impact tool, viewed from below. Figure 2 It is a side view. Figure 3 It is a top view. Figure 4 This is a central longitudinal sectional view of an electric hammer drill.

[0049] The electric hammer drill 1 has a housing 2 that forms its outer contour. The housing 2 includes a main housing 3, a rear housing 4, and a front housing 5.

[0050] The main housing 3 houses the motor 6 at the bottom and connects to the front housing 5 at the top. The motor 6 is housed so that the rotating shaft 7 is oriented vertically. A pinion 8 is mounted upwards at the upper end of the rotating shaft 7. The main housing 3 is formed by threading the left and right split housings 3a and 3b together. Multiple upper air intake ports 3c, 3c… are formed on the upper surface of the main housing 3.

[0051] The rear housing 4 has a handle portion 9 extending vertically and is annularly connected to the main housing 3. The rear housing 4 is formed by threading together the left and right split housings 4a and 4b. A switch 10 is provided on the upper part of the handle portion 9, which causes the trigger 11 to protrude forward. A battery mounting portion 12 is formed on the lower part of the handle portion 9. A battery pack 13 is slidably mounted on the battery mounting portion 12 from the rear. A terminal plate 14 electrically connected to the battery pack 13 is held inside the battery mounting portion 12. A controller 15 is housed on the upper side of the terminal plate 14.

[0052] The front housing 5 is cylindrical, comprising a rear cylindrical portion 16 and a front cylindrical portion 17. The rear cylindrical portion 16 has a generally quadrilateral cross-section extending vertically and is threaded to the upper part of the main housing 3 from the front. The front cylindrical portion 17 has a circular cross-section and protrudes forward from an upwardly eccentric position of the rear cylindrical portion 16. An operating mode switching knob 18 is provided on the left side of the rear cylindrical portion 16.

[0053] An inner shell 19, assembled to the rear cylinder 16, is provided in the upper part of the main shell 3. An impact mechanism 20 is provided inside the front shell 5 and the inner shell 19.

[0054] An intermediate shaft 21 and a tool holder 22 are respectively provided in the front-rear direction of the impact mechanism section 20. The intermediate shaft 21 is supported on the lower side inside the front housing 5 and the inner housing 19 so that it can rotate. A first gear 23, a hub sleeve 24, a clutch 25 and a second gear 26 are provided from the rear of the intermediate shaft 21. The pinion 8 of the rotating shaft 7 passes through the inner housing 19 from below and is supported by a bearing 27, and meshes with the first gear 23.

[0055] The tool holder 22 is cylindrical and is supported coaxially with the front cylindrical portion 17 above the intermediate shaft 21, allowing it to rotate. A third gear 28 is provided in the middle of the tool holder 22. The third gear 28 meshes with the second gear 26 of the intermediate shaft 21. The front end of the tool holder 22 protrudes forward from the front cylindrical portion 17. An operating sleeve 29 for attaching and detaching the drill bit is provided at the front end of the tool holder 22.

[0056] A piston cylinder 30 is loosely inserted into the rear of the tool holder 22 in a manner that allows it to move back and forth. An arm 31 is connected to the rear end of the piston cylinder 30. The arm 31 is externally mounted to a hub sleeve 24 via a swash bearing that tilts the axis, and is capable of swinging back and forth. An impactor 33 is housed inside the piston cylinder 30 via an air chamber 32 in a manner that allows it to move back and forth. An impact bolt 34 is provided in the tool holder 22 at the front of the piston cylinder 30.

[0057] A cylindrical motor housing portion 35 is formed below the front housing 5 within the main housing 3. A motor 6 is housed within the motor housing portion 35. The motor 6 is a brushless motor comprising a stator 36 and a rotor 37 having a rotating shaft 7. The lower part of the rotating shaft 7 passes through a bearing retainer 38 formed within the motor housing portion 35 and is supported by a bearing 39. A lamp 40, positioned in front of the illumination tool holder 22, is provided in front of the bearing retainer 38 and on the front surface of the motor housing portion 35.

[0058] A pair of chamfered portions 41, 41 are formed on the left and right sides of the lamp 40, extending from the front surface to the side of the motor housing 35. A pair of upper engaging portions 42, 42 are formed on the upper side of the chamfered portions 41, 41. Each upper engaging portion 42 is formed by cutting a groove in the outer surface of the motor housing 35 from the chamfered portion 41 upwards, creating an opening on the side and lower surfaces. The lower part of each upper engaging portion 42 is a tapered shape, with the groove width widening downwards. The upper engaging portions 42, 42 are used for mounting the dust collection accessory 90, described later. Engaging grooves 43 extending in the front-to-back direction are formed on the left and right centers of the lower surface of the rear cylinder 16, slightly above the upper engaging portions 42, 42. The front end of the engaging groove 43 opens forwards.

[0059] A fan housing portion 45 is formed below the motor housing portion 35. The fan housing portion 45 is also as... Figure 5 As shown, the upper plate portion 46 and the rear plate portion 47 are separated within the main body housing 3 to form a motor housing portion 35 and a battery mounting portion 12. The upper plate portion 46 is a plate-shaped part that separates the main body housing 3 vertically in the front-back and left-right directions. A bearing retaining portion 38 is integrally formed on the upper surface of the upper plate portion 46. The rear plate portion 47 extends downward from the rear end of the upper plate portion 46 and is a plate-shaped part that separates the main body housing 3 vertically in the front-back and left-right directions.

[0060] The lower end of the rotating shaft 7 passes through the upper plate portion 46 and protrudes into the fan housing portion 45. Two fans 48 are orthogonally mounted at the lower end of the rotating shaft 7 within the fan housing portion 45. The two fans 48 are divided by a circular partition plate 49 (viewed from above), with a motor cooling fan 50 on the upper side and a dust collection fan 51 on the lower side. Both fans 50 and 51 are centrifugal fans. The upper ends of each fin 50a of the motor cooling fan 50 are close to the upper plate portion 46. A cover 52, except for the central portion, is provided at the lower part of the dust collection fan 51, covering each fin 51a from below. Two annular upper flanges 53, 53 are formed concentrically downwards on the inner periphery and radially outer side of the cover 52.

[0061] Above the motor cooling fan 50 and on the upper plate 46, there are upper vents 54, 54 with openings at the front and rear of the bearing retainer 38.

[0062] Also Figure 6 As shown, the left-right width of the fan housing 45 is greater than the left-right width of the motor housing 35. The front surface of the fan housing 45 also extends forward beyond the front surface of the motor housing 35. The left-right width of the fan housing 45 is approximately equal to the left-right width of the battery mounting portion 12 and the battery pack 13.

[0063] On the left and right sides of the fan housing 45, near the front surface, there is a pair of lower engaging portions 55, 55. The lower engaging portions 55, 55 are grooves cut upwards from the lower surface of the fan housing 45, creating openings on the sides and lower surface. The lower engaging portions 55, 55 are also used for mounting the dust collection accessory 90. The lower engaging portions 55, 55 are parallel to the upper engaging portions 42, 42, but are positioned further forward and on the left and right outer sides.

[0064] Also Figure 7 As shown, locking grooves 56, 56 extending in the front-to-back direction are formed on the lower left and right sides of the fan housing 45 and behind the lower engaging parts 55, 55. Protrusions 57, 57 extending from the left and right inner sides towards the inside of the fan housing 45 are formed at the rear of the locking grooves 56, 56. Slit-shaped side exhaust ports 58, 58 are formed above and below each protrusion 57, communicating between the inside of the fan housing 45 and the inside of the locking groove 56. Figure 6 As shown, the lower left and right sides of the fan housing 45, which has locking grooves 56, 56, become tapered surfaces whose width narrows as they face downwards.

[0065] A baffle 60 is provided inside the fan housing 45 and below the dual fans 48. Also... Figure 8 and Figure 9As shown, the front side of the baffle 60 is approximately circular when viewed from above, and the rear side is approximately quadrilateral when viewed from above. A circular lower vent 61 is formed at the center of the approximately circular portion of the baffle 60. Two annular lower flanges 62, 62 are formed concentrically upward on the inner periphery and radially outer side of the lower vent 61.

[0066] A lower cylindrical portion 63 is formed downward on the lower surface of the baffle 60. This lower cylindrical portion 63 is coaxial with the lower vent 61 and has a larger diameter than the lower vent 61. A forward-protruding locking piece 64 is formed at the front end of the baffle 60. An upward-standing semi-cylindrical portion 65 is formed on the left side of the locking piece 64. The semi-cylindrical portion 65 is oriented such that its open side faces radially outward from the baffle 60.

[0067] A receiving flange 66 for a baffle 60 is formed inside the fan housing 45. Also, Figure 10 As shown, the receiving flange 66 is formed in a shape that surrounds the rear part and the left, right, and front right outer periphery of the baffle 60 above the left and right locking grooves 56, 56. The left, right, and front right sides of the receiving flange 66 protrude from the inner surface of the fan housing 45. The left side of the receiving flange 66 is connected to a bulge 67 that bulges inward toward the fan housing 45 to form the lower engaging part 55. A plurality of longitudinal flanges 68, 68... are formed on the upper side of the bulge 67 in the vertical direction. The front right side of the receiving flange 66 extends to the right side of the locking piece 64 of the baffle 60.

[0068] The rear portion of the receiving flange 66 is formed at the upper end of a partition wall 69 that rises upward from the bottom surface of the fan housing 45, located forward of the rear plate portion 47. The partition wall 69 separates the fan housing 45 from the rear below the dual fans 48. A bottom exhaust port 70 extending in the left-right direction is formed on the rear side of the partition wall 69 and on the bottom surface of the fan housing 45.

[0069] A groove 71 for locking the locking piece 64 is formed on the front inner surface of the fan housing 45.

[0070] A circular hole 72 is formed in front of the bottom exhaust port 70 and on the bottom surface of the fan housing 45. The circular hole 72 is coaxial with the lower cylindrical portion 63 of the baffle 60 and has approximately the same diameter. A cap 73 is fitted into the circular hole 72 from the inside. An opening / closing device 74 and a coil spring 75 are sandwiched between the cap 73 and the baffle 60.

[0071] The cap 73 has a fitting portion 76 on its lower surface that fits into the circular hole 72. A circular lower air intake 77 is formed at the center of the fitting portion 76. A peripheral wall portion 78 is formed on the outer periphery of the cap 73 for the lower end of the lower cylinder portion 63 of the baffle 60 to be inserted into the fitting portion.

[0072] The opening / closing device 74 includes a central circular plate portion 80, an outer ring portion 81, and a cross flange 82 connecting the circular plate portion 80 and the ring portion 81. The diameter of the circular plate portion 80 is larger than the diameter of the lower air intake 77 of the cap 73, and a downwardly protruding circular protrusion 83 is provided at the center of the lower surface of the circular plate portion 80. The ring portion 81 has an inner diameter larger than the outer diameter of the circular plate portion 80 and is concentrically arranged with the circular plate portion 80. The diameter of the ring portion 81 is smaller than the inner diameter of the lower cylinder portion 63, and the ring portion 81 can fit into the inner side of the peripheral wall portion 78 of the cap 73. The cross flange 82 is concentrically arranged towards the upper surfaces of the circular plate portion 80 and the ring portion 81 and connects the two. Therefore, four arc-shaped through holes 84, 84… are formed at equal intervals along the circumference between the circular plate portion 80 and the ring portion 81.

[0073] The helical spring 75 is housed within the lower cylinder 63. The lower end of the helical spring 75 abuts against the upper surface of the ring portion 81 on the outside of the cross flange 82 of the opener / closer 74. The upper end of the helical spring 75 abuts against the lower surface of the baffle 60.

[0074] In the fan housing 45, the baffle 60 and cap 73, which hold the switch 74 and the coil spring 75, are first assembled between the receiving flange 66 of the left-side split housing 3a and the bottom surface of the fan housing 45. At this time, the baffle 60 causes the semi-cylindrical portion 65 to abut against the longitudinal flanges 68, 68 on the left-side bulge 67, causing the locking piece 64 to lock into the groove 71. If the right-side split housing 3b is assembled in this state, the baffle 60 is forced to the left and right and rearward by the repulsive force of the coil spring 75, abutting against the receiving flange 66 from below. At the same time, the switch 74 and cap 73 are forced downward together. Therefore, the cap 73 is pressed into the position where the fitting portion 76 fits into the circular hole 72, thereby pressing the switch 74 into the position where the lower intake port 77 is closed on the circular plate portion 80.

[0075] In this state, the lower flanges 62, 62 of the baffle 60 and the upper flanges 53, 53 of the cover 52 of the dust collector fan 51 overlap each other radially alternately without contact. Therefore, a labyrinth is formed between the dust collector fan 51 and the baffle 60.

[0076] Thus, the fan housing 45 is contained within the baffle 60 positioned on the receiving flange 66. Figure 5 , Figure 6 The partition wall 60 is divided into an upper space A1 and a lower space A2. The upper space A1 communicates with the rear and bottom exhaust port 70 of the partition wall 69. The lower space A2 is formed in front of the partition wall 69 and communicates with the left and right side exhaust ports 58, 58. A connecting port 85 is formed between the locking piece 64 and the semi-cylindrical portion 65 to connect the upper space A1 and the lower space A2. Figure 10 ).

[0077] Thus, within the main housing 3, a motor cooling flow path R1 is formed by the rotation of the motor cooling fan 50 via the dual fans 48. In the motor cooling flow path R1, air drawn in from the upper air intake 3c on the upper surface of the main housing 3... Figure 5 As indicated by the dashed arrow, air passes between the main housing 3, the front housing 5, and the inner housing 19, and then through the motor 6. Afterwards, air enters the upper space A1 of the fan housing 45 through the upper vent 54 and exits through the bottom exhaust port 70.

[0078] On the other hand, within the fan housing 45, the rotation of the dust collection fan 51 of the dual fans 48 forms a machine-side dust collection flow path R2. In this machine-side dust collection flow path R2, with the opening / closing device 74 rising to overcome the force of the coil spring 75, thus opening the lower suction port 77, as... Figure 5 As indicated by the dotted-dash arrow, the air drawn into the lower space A2 from the lower intake port 77 enters the upper space A1 through the through hole 84 of the switch 74, the lower cylinder 63 of the baffle 60 and the lower vent 61, and flows radially outward from the dust collection fan 51 to the bottom exhaust port 70, just like the motor cooling flow path R1.

[0079] The motor cooling flow path R1 and the dust collection flow path R2 on the machine side are equipped with a branch flow path R3. In the branch flow path R3, a portion of the air entering the upper space A1 is as follows: Figure 5 As indicated by the double-dotted arrow, the air enters the lower space A2 from the radial outer side of the dual fans 48 through the connecting port 85, and is discharged from the side exhaust ports 58, 58 through the outer periphery of the lower cylinder 63 of the baffle 60.

[0080] (Instructions for dust collection accessories)

[0081] Figure 11 This is a perspective view showing an example of a dust collection accessory (hereinafter referred to as "accessory"). Figure 12 This is a side view of the accessory. Figure 13 It is a top view. Figure 14 This is a central longitudinal sectional view of the accessory.

[0082] Accessory 90 has an outer casing 91 that is L-shaped when viewed from the side. The outer casing 91 is assembled from left and right split outer casings 91a and 91b. A main body 92 with a dust collection box 93 is provided on the front side of the outer casing 91. A protrusion 94 protrudes rearward from the lower part of the main body 92 on the rear side of the outer casing 91. A sliding part 95 protrudes forward on the upper left side of the main body 92.

[0083] The outer casing 91 includes: a front top plate 96 forming the upper surface of the main body 92, a rear top plate 97 forming the upper surface of the protrusion 94, a bottom plate 98 forming the lower surface of the main body 92 and the protrusion 94, a pair of side plates 99 forming the sides of the main body 92 and the protrusion 94, a front back plate 100 forming the back of the main body 92, and a rear back plate 101 forming the back of the protrusion 94. The main body 92 has a front opening, allowing the dust collection box 93 to be installed and removed from the front into the main body 92.

[0084] The sliding part 95 includes a sliding cylinder 102 and a flexible hose 103. The sliding cylinder 102 is held in place by a guide metal part 104 provided on the front top plate 96 so that it can move back and forth. A nozzle 105 with an intake port 106 is orthogonally mounted at the front end of the sliding cylinder 102. The intake port 106 is located at the center in the left-right direction on the upper side of the main body 92.

[0085] The flexible hose 103 is loosely inserted into the sliding cylinder 102, with its front end connected to the base end of the nozzle 105. The rear end of the flexible hose 103 is connected to the upstream end of the pipe 107, which is protruding from the left rear part of the main body 92. The flexible hose 103 integrally has a spiral wire, which is compressed between the nozzle 105 and the pipe 107, thereby applying force forward to the sliding cylinder 102. The forward and backward positions of the sliding cylinder 102 can be limited by the limiters 108, 108 provided on the side of the sliding cylinder 102.

[0086] The downstream end of pipe 107 opens into the main body 92 and communicates with an inlet (not shown) provided in dust collection box 93. Dust collection box 93 includes a cover 109 with a filter 110 and a box body 111 hinged to the cover 109 and covering the filter 110 from the front. Dust collection box 93 is mounted by the lower surface of box body 111 engaging with a support shaft 112 provided at the front end of base plate 98, and by a locking piece 113 protruding forward from cover 109 and elastically engaging with the front end of front top plate 96. An outlet 114 for air passing through filter 110 is provided at the lower part of cover 109. A vibration generator 115 is provided on the front surface of box body 111. The vibration generator 115 is used to vibrate box body 111 by rotation to dislodge dust adhering to filter 110.

[0087] An exhaust pipe 116 is provided at the protrusion 94, with its front end connected to the outlet 114. The exhaust pipe 116 is a prismatic tube that extends rearward within the protrusion 94 and then curves upward. An exhaust port 117 is formed on the upper surface of the rear end of the exhaust pipe 116. A rubber cap 118 covers the exhaust port 117. The rubber cap 118 has a tapered sealing portion 119 at its upper part, which becomes smaller in diameter as it faces upward. An opening 120, coaxial with and approximately the same diameter as the exhaust port 117, is formed at the center of the sealing portion 119. The rubber cap 118 fits into a circular hole 121 provided on the rear top plate 97 above the exhaust port 117. The sealing portion 119 protrudes upward from the circular hole 121. An upwardly protruding pin 122 is provided on the lower side of the exhaust port 117 and inside the rear end of the exhaust pipe 116. Pin 122 passes through the center of the opening 120 of the exhaust port 117 and the rubber cap 118 and protrudes upwards from the rubber cap 118.

[0088] Thus, in the 90% formation of the parts, there is a Figure 14 The accessory-side dust collection path R4 is indicated by a dotted-line arrow. In the accessory-side dust collection path R4, air entering from the suction port 106 passes through the nozzle 105, flexible hose 103, and pipe 107 into the dust collection box 93. Then, after passing through the filter 110, the air enters the exhaust pipe 116 from the outlet 114 and is discharged upward from the exhaust port 117.

[0089] A height difference is formed on the upper surface of the front top plate 96, where the rear part is lower than the front part. The lower surface of the rear cylinder portion 16 of the front housing 5 of the hammer drill 1 can be placed on the rear part of the front top plate 96. A locking guide rail 123 is provided in the center of the rear part in the left-right direction and protrudes in the front-rear direction. The locking guide rail 123 corresponds to the locking groove 43 provided on the lower surface of the rear cylinder portion 16. The rear edge of the front top plate 96 has a curved shape consistent with the motor housing portion 35 of the hammer drill 1. The upper rear part of the left and right side plates 99, 99 connected to the rear edge of the front top plate 96 forms a pair of arms 124, 124 whose left-right width is narrower than the front and lower parts of the side plates 99, 99. The left-right width of the arms 124, 124 is slightly larger than the left-right width of the upper part of the motor housing portion 35. On the opposing surfaces of the arms 124, 124, upper protrusions 125, 125 are formed in the vertical direction to engage with the upper engaging portions 42, 42 provided on the motor housing portion 35.

[0090] Below the upper protrusions 125, 125, the left and right widths of the side plates 99, 99 are slightly larger than the left and right widths of the fan housing 45. Below the upper protrusions 125, 125 and on the lower part of the side plates 99, 99, opposite each other in the vertical direction, are lower protrusions 126, 126 that engage with the lower engaging portions 55, 55 provided on the fan housing 45. The lower protrusions 126, 126 are positioned in a similar manner to the upper engaging portions 42, 42 and the lower engaging portions 55, 55, which are located further forward than the upper protrusions 125, 125. On the front back plate 100, a plurality of flanges 127, 127... are formed in the left and right directions at intervals in the vertical direction. These flanges 127, 127... are aligned with the front surface of the motor housing 35 and the fan housing 45, making the rear surface curved.

[0091] The left and right side plates 99, 99 of the protrusion 94 protrude upwards compared to the rear top plate 97. A pair of left and right slits 130, 130 are formed in a strip along the vertical direction on these side plates 99, 99. A pair of left and right hook plates 131, 131 are provided on the slits 130, 130. Figure 15 As shown, each hook plate 131 is supported by a support pin 132 erected in the front-rear direction within the cutout portion 130, allowing its upper and lower ends to swing in the left-right direction. A claw portion 133 protruding inward is formed at the upper end of each hook plate 131. The claw portion 133 has a barb shape that tilts downward as its upper surface faces the center side to the left or right. Each hook plate 131 is held inside the protrusion 94 within the support pin 132 and subjected to a rotational force in the direction of its upward swing inward. Stop portions 135, 135( ), are formed on the front and rear side edges of the cutout portion 130 for the front and rear side edges of the hook plate 131 to abut against. Figure 13 , 14 Therefore, the hook plates 131, 131 are restricted from rotating in a parallel posture with their upper side edges abutting against the stop portion 135, which is parallel to the side plates 99, 99, under normal conditions. In this parallel posture, the claw portions 133, 133 protrude inwards from the side plates 99, 99. Finger hook portions 136, 136 are recessed below the support pins 132, 132 and on the outer surface of the hook plates 131, 131.

[0092] (Dust Collection System Description)

[0093] Install the aforementioned accessory 90 on the aforementioned electric hammer drill 1. For this installation, firstly, as... Figure 16As shown, the hammer drill 1 and accessory 90 are arranged such that the protrusion 94 is located below the fan housing 45, and the arms 124, 124 of the side plates 99, 99 are located below the upper engaging portions 42, 42 of the motor housing 35. Then, the flange 127 of the front back plate 100 of accessory 90 abuts against the front surface of the fan housing 45. In this position, the upper protrusions 125, 125 are located directly below the upper engaging portions 42, 42, while the lower protrusions 126, 126 are located directly below the lower engaging portions 55, 55. Additionally, the engaging guide rail 123 is located directly below the engaging groove 43. In this state, the rubber cap 118 and pin 122 of the protrusion 94 are located directly below the opener 74 that closes the lower intake port 77.

[0094] Slide accessory 90 upwards or hammer drill 1 downwards. The relatively moved upper protrusions 125, 125 then engage with upper engaging portions 42, 42 from below, and lower protrusions 126, 126 engage with lower engaging portions 55, 55 from below. Due to the difference in their lengths, the timing of engagement differs; the lower protrusions 126, 126 engage with lower engaging portions 55, 55 first, compared to the upper protrusions 125, 125 engaging with upper engaging portions 42, 42. Therefore, through the first engagement of the lower protrusions 126, 126 with lower engaging portions 55, 55, the upper protrusions 125, 125 are smoothly guided to their engagement position with upper engaging portions 42, 42. Even if there is some looseness here, the upper protrusions 125, 125 can be reliably guided to the upper engaging parts 42, 42 by the conical shape of the lower part of the upper engaging parts 42, 42. On the other hand, with the relative movement of the fitting 90, the engaging guide rail 123 also engages with the engaging groove 43 from below.

[0095] Then, if the upper protrusion 125 abuts against the upper surface of the upper engaging part 42, the lower protrusion 126 abuts against the upper surface of the lower engaging part 55, and the engaging guide rail 123 abuts against the lower surface of the front housing 5, the relative movement of the accessory 90 is restricted.

[0096] When the accessory 90 moves relative to each other, the hook plates 131, 131 of the protrusion 94 abut against the lower side of the fan housing 45 through the inclined contact of the claws 133, 133, thereby expanding the upper end to the left and right in a way that overcomes the force of the torsion springs 134, 134. Therefore, relative movement of the accessory 90 is permitted. If the relative movement of the accessory 90 is restricted by the contact of the engaging parts, the claws 133, 133 simultaneously reach the locking grooves 56, 56. Then, the hook plates 131, 131 return to a parallel position under the force of the torsion springs 134, 134. Therefore, as... Figure 17 As shown, together with the engagement of each locking part, the claws 133, 133 are locked in the locking grooves 56, 56.

[0097] On the other hand, along with the relative movement of the accessory 90, the pin 122, after abutting against the circular protrusion 83 of the opener / closer 74, pushes the opener / closer 74 upward in a manner that overcomes the force exerted by the coil spring 75. Therefore, as Figure 18 As shown, the lower air intake 77 is open, and the sealing part 119 of the rubber cap 118 abuts against the lower surface of the cap 73 and deforms elastically, thereby sealing the lower air intake 77 and the exhaust port 117.

[0098] In this way, the dust collection system S can be installed with the accessory 90 in a state where its movement relative to the hammer drill 1 is restricted in vertical, horizontal, and back-and-forth directions. In this state, the dust collection flow path R4 on the accessory side is connected to the dust collection flow path R2 on the machine side.

[0099] When forming the dust collection system S, it is only necessary to make Figure 16 The setting position of the accessory 90 degrees Figure 17 , 18 The mounting position can be moved relative to the motor housing 35 and the fan housing 45. Therefore, the relative movement of the accessory 90 during installation can be short. Furthermore, the flange 127 of the front backplate 100 of the housing 91 abuts against the front surface of the motor housing 35 and the fan housing 45 from the front. Figure 16 In its current position, the upper engaging part 42 and the upper protrusion 125, the lower engaging part 55 and the lower protrusion 126, and the engaging groove 43 and the engaging guide rail 123 are arranged on the same line in the vertical direction. Therefore, the engagement parts can be easily aligned with each other, allowing for smooth installation of the subsequent accessory 90.

[0100] In the dust collection system S, the drill bit B is pressed against the work surface of the workpiece by pressing the suction port 106 of the accessory 90. Figure 18 The tip of the drill bit 10 is positioned inside the suction port 106. In this state, the trigger 11 of the hammer drill 1 is pressed in. Switch 10 is then activated, and controller 15 drives motor 6. This causes the rotating shaft 7 to rotate, which in turn rotates the intermediate shaft 21 via pinion 8. At this time, the clutch 25 is slid by operating the switching knob 18 located on the side of the front housing 5. This allows selection of any of the following positions: a forward position where the clutch 25 engages only with the second gear 26 (drilling mode), a backward position where the clutch 25 engages only with the hub sleeve 24 (hammering mode), or an intermediate position where the clutch 25 engages with both the second gear 26 and the hub sleeve 24 (hammer drill mode). In drilling mode, the tool holder 22 rotates via the third gear 28, causing the drill bit B to rotate. In hammering mode, the piston cylinder 30 reciprocates via the swing of the arm 31. Therefore, the impactor 33 reciprocates in conjunction with the air chamber 32. Therefore, the impactor 33 impacts the drill bit B via the impact bolt 34. In hammer drill mode, the rotation of the tool holder 22 and the impact of the impact bolt 34 occur simultaneously.

[0101] If the electric hammer drill 1 is advanced with the suction port 106 set, the sliding cylinder 102 and the nozzle 105 will retract together, so that the drill bit B can pass through the suction port 106 to process the material to be processed.

[0102] The dual fans 48 rotate simultaneously with the rotating shaft 7. Therefore, air flows within the motor cooling flow path R1 due to the rotation of the motor cooling fan 50. That is, air drawn in from the upper intake port 3c passes sequentially through the main body housing 3, the front housing 5, and the motor 6, cooling each of them respectively. Then, the cooled air enters the upper space A1 of the fan housing 45 through the upper vent 54 and is discharged from the bottom exhaust port 70.

[0103] On the other hand, due to the rotation of the dust collection fan 51, air flows in the dust collection flow path R4 on the accessory side and the dust collection flow path R2 on the machine side. That is, the air drawn in from the suction port 106, which generates suction force, flows sequentially through the flexible hose 103, the pipe 107, the dust collection box 93, and the exhaust pipe 116, and then enters the upper space A1 from the lower suction port 77 through the lower vent 61 of the baffle 60, and is discharged from the bottom exhaust port 70. At the same time, a portion of the air entering the upper space A1 flows to the branch flow path R3. That is, a portion of the air enters the lower space A2 through the connecting port 85 and is discharged from the side exhaust ports 58, 58.

[0104] Therefore, dust generated from the processed material is drawn in by the inlet 106 and enters the dust collection box 93 through the nozzle 105, flexible hose 103, and pipe 107, and is captured by the filter 110 and stored in the box body 111.

[0105] When removing accessory 90, the left and right hook plates 131, 131, with their finger hook portions 136, 136 clamping the protrusion 94, are pressed inward. As a result, the hook plates 131, 131 change from a parallel position to an expanded position, opening outward from their upper ends, thus moving their claw portions 133, 133 away from the locking grooves 56, 56. Therefore, if accessory 90 is slid downward while remaining in its original position, or if the hammer drill 1 is slid upward, then... Figure 16 In this way, the upper protrusion 125 and the lower protrusion 126 are offset downwards from the upper engaging portion 42 and the lower engaging portion 55, respectively. Simultaneously, the engaging guide rail 123 is positioned offset downwards from the engaging groove 43. Therefore, if the accessory 90 is moved forward relative to the hammer drill 1, the accessory 90 can be separated from the hammer drill 1. Thus, as long as the accessory 90 is moved from... Figure 17 and Figure 18 The installation location is towards Figure 16 The setting position can be moved relatively, so the relative movement of accessory 90 when it is removed is also relatively short.

[0106] The dust accumulated in the main body 111 of the dust collection box 93 can be disposed of by removing the dust collection box 93 from the accessory 90 and opening the cover 109.

[0107] (The public effect of the electric hammer drill)

[0108] The hammer drill 1 of the above embodiment includes: a housing 2, which can mount the accessory 90; and an impact mechanism 20, which is disposed within the housing 2 and can impact the drill bit B (tip tool) mounted at the front end by a reciprocating impactor 33 (impact member). Additionally, the hammer drill 1 includes: a motor 6, which is configured within the housing 2 such that its rotation axis 7 intersects the impact axis of the impact mechanism 20; and a dust collection fan 51, which is disposed on the rotation axis 7. Furthermore, the dust collection fan 51 is disposed below the motor 6.

[0109] According to this structure, it is not necessary to make the outer diameter of the motor housing 35 (motor housing) and the dust collection fan 51 increase radially accordingly. Therefore, even if the dust collection fan 51 is provided, the miniaturization of the hammer drill 1 can be maintained.

[0110] In particular, a motor cooling fan 50 is provided on the rotating shaft 7, which is adjacent to the dust collection fan 51 in the axial direction of the rotating shaft 7. Therefore, even if the motor cooling fan 50 is provided on the basis of the dust collection fan 51, it is not necessary to increase the radial size of the motor housing 35 (motor storage part), thereby maintaining miniaturization.

[0111] A lower air intake 77 (air inlet) that draws in air via the rotation of the dust collection fan 51 is located on the lower surface of the housing 2. Therefore, foreign objects such as dust are difficult to enter through the lower air intake 77, thus ensuring a wide opening area.

[0112] A bottom exhaust port 70 (exhaust port) for discharging air by the rotation of the dust collection fan 51 is provided on the lower surface of the housing 2. Therefore, it is difficult for foreign objects such as dust to enter through the bottom exhaust port 70, thereby ensuring a wide opening area.

[0113] A side exhaust port 58 (second exhaust port) for discharging air by the rotation of the dust collection fan 51 is provided on the side of the housing 2. Therefore, the required air volume can be ensured.

[0114] The lower air intake 77 can be opened and closed by a disc-shaped opener 74. Therefore, even with the lower air intake 77, the dustproof and waterproof properties of the hammer drill 1 can be ensured.

[0115] The switch 74 is coaxially arranged with the dust collection fan 51. Therefore, the switch 74 can be arranged compactly. In addition, the airflow becomes smooth when the switch 74 is open.

[0116] The left-right width of the fan housing portion 45 (dust collector fan housing portion) in housing 2 is greater than the left-right width of the motor housing portion 35 in housing 2. Therefore, the motor housing portion 35 becomes slimmer, improving its appearance.

[0117] The bearing 39, which supports the rotating shaft 7 within the housing 2, is positioned above the dust collector fan 51. Therefore, including the bearing 39, the motor housing 35 can be kept compact.

[0118] The accessory 90 slides relative to the housing 2 in the up-down direction (a predetermined straight line direction), thereby enabling installation by engaging the upper engagement portion 42 and the lower engagement portion 55 provided on the housing 2 with the upper protrusion 125 and the lower protrusion 126 provided on the accessory 90. Furthermore, the upper engagement portion 42 and the lower engagement portion 55 provided on the housing 2 are provided separately in the up-down direction.

[0119] Therefore, even without making the upper engaging portion 42 and the lower engaging portion 55 longer, the accessory 90 can be installed without loosening. Thus, there is no need to change the shape of the housing 2, thereby maintaining miniaturization and light weight.

[0120] (Examples of publicly disclosed modifications to electric hammer drills)

[0121] The shape and size of the dust collection fan are not limited to the embodiments described above. For example, a dust collection fan without a cover on its lower surface can also be used. Fans other than centrifugal fans can also be used.

[0122] In the above embodiment, a dual-fan system with a motor cooling fan adjacent to the dust collection fan is used. However, a dual-fan system may not be used, and only a dust collection fan may be provided on the lower side of the motor.

[0123] The motor can be configured such that the rotation axis and the impact axis are intersecting, and is not limited to the orthogonal configuration as described in the above embodiments.

[0124] The position and shape of the air intake are not limited to the lower air intake of the above embodiment. The shape of the opener / closer can also be appropriately changed. The opener / closer may not be constructed by moving up and down to open and close the air intake as in the above embodiment. For example, a part of the opener / closer may be connected to the fan housing by a hinge or the like, so that the air intake is opened and closed by rotating the opener / closer around an axis. Alternatively, the air intake may be opened and closed by the opener / closer moving linearly in a direction intersecting the air intake.

[0125] The air intake and exhaust ports can also be located on surfaces of the housing other than the lower surface. Therefore, the cap and opening / closing device can be modified in position and shape to correspond to the location of the air intake port.

[0126] In the fan housing, the connection between the upper and lower spaces can also be eliminated. That is, the side exhaust port can also be omitted by removing the branch flow path.

[0127] The dust collection path on the unit side within the fan housing can also be modified appropriately. Air can also be directed towards the battery mounting area for controller cooling.

[0128] In this invention, the engaging portion of the impact tool that engages with the accessory is not limited to a structure where the upper and lower engaging portions are separated in the vertical direction as in the above embodiment. That is, it can also be a structure in which the accessory is installed by engaging one or a pair of convex engaging portions extending in the vertical direction with one or a pair of concave engaging portions.

[0129] In the above embodiments, the accessories can be disassembled and assembled by moving them relative to the hammer drill in the up-down direction, but they can also be disassembled and assembled by moving them relative to each other in the front-back direction or the left-right direction.

[0130] The mounting structure of the accessory to the housing in this invention is not limited to the engagement of the engaging parts due to linear movement as in the above embodiment. For example, it can be appropriately modified to a structure in which the engaging parts such as hooks disengage from the engaging parts such as recesses.

[0131] The structure of the impact mechanism is not limited to the above embodiment. Motors other than brushless motors can also be used.

[0132] This invention is not limited to electric hammer drills; it can also be used with other impact tools such as electric hammers. AC tools can also be used instead of DC tools.

[0133] (The public effect of the dust collection system)

[0134] In the aforementioned dust collection system S, the accessory 90 slides relative to the housing 2 of the hammer drill 1 in the up-down direction (a predetermined straight line direction). This allows for installation by engaging the upper engaging portion 42 and the lower engaging portion 55 (concave engaging portion) provided on the housing 2 with the upper protrusion 125 and the lower protrusion 126 (convex engaging portion) provided on the accessory 90. Furthermore, the convex engaging portion and the concave engaging portion are separated in the up-down direction. The convex engaging portion and the concave engaging portion include the upper engaging portion 42 (first concave engaging portion) and the upper protrusion 125 (first convex engaging portion) that engage with each other in the installed state of the accessory 90, and the lower engaging portion 55 (second concave engaging portion) and the lower protrusion 126 (second convex engaging portion) that engage with each other in the same installed state.

[0135] According to this structure, even if the upper engaging portion 42 and the lower engaging portion 55 are not made to be longer, the accessory 90 can be installed without loosening. Therefore, there is no need to change the shape of the housing 2, thereby maintaining miniaturization and lightness.

[0136] In particular, a pair of upper engaging portions 42 and upper protrusions 125, and a pair of lower engaging portions 55 and lower protrusions 126 are provided on the left and right sides respectively. Therefore, the accessory 90 can be installed with good balance, thereby effectively suppressing the loosening of the accessory 90 in the left and right directions when installed.

[0137] The left and right widths of the pair of upper engaging portions 42 and upper protrusions 125, and the pair of lower engaging portions 55 and lower protrusions 126 are different from each other. Therefore, the engaging portions corresponding to the shape of the housing 2 can be arranged left and right relative to each other.

[0138] The straight line direction is the vertical direction. The left-right width of the pair of upper engaging portions 42 and upper protrusions 125 that engage with each other on the upper side is smaller than the left-right width of the pair of lower engaging portions 55 and lower protrusions 126 that engage with each other on the lower side. Therefore, the engaging portions, which correspond to the shapes of the housings 2 that are different in the upper and lower sides, can be arranged left-right to each other, just like the motor housing portion 35 and the fan housing portion 45. In addition, since the left-right width of the lower engaging portions is larger, the engagement state between the fan housing portion 45 and the protrusion 94 is stable.

[0139] The upper engaging portion 42 and upper protrusion 125, and the lower engaging portion 55 and lower protrusion 126 are positioned differently in the front-to-back direction. Therefore, the engaging portions corresponding to the shape of the housing 2 can be arranged in a front-to-back configuration.

[0140] When the accessory 90 is installed by sliding relative to the housing 2 in an up-down direction, the lower engaging portion 55 and the lower protrusion 126 engage before the upper engaging portion 42 and the upper protrusion 125. Therefore, by using the lower engaging portion 55 and the lower protrusion 126, which engage first, the upper protrusion 125 is smoothly guided to the engaging position with the upper engaging portion 42.

[0141] Before the accessory 90 slides relative to each other in the up and down directions, it abuts against the housing 2 at a predetermined position. The upper engaging part 42 and the upper protrusion 125, and the lower engaging part 55 and the lower protrusion 126 are respectively located on the same line in the up and down directions. Therefore, the engagement parts can be easily aligned with each other, thereby enabling smooth installation of the accessory 90.

[0142] The housing 2 is provided with a locking groove 43 (third concave locking part) extending along the impact axis of the impact mechanism 20, and the accessory 90 is provided with a locking guide rail 123 (third convex locking part) that engages with the locking groove 43 when the accessory 90 is installed in the housing 2. Therefore, the loosening of the accessory 90 in the left and right direction can be more effectively suppressed, thereby improving the integrity of the housing 2 and the accessory 90.

[0143] The accessory 90 has a protrusion 94 located on the lower side of the housing 2 when installed in the housing 2, and a hook plate 131 (hook) is provided on the protrusion 94 that is engaged with the housing 2 in the installed state. Therefore, the accessory 90 is prevented from falling off the housing 2, and there is no possibility that the accessory 90 will accidentally shift or fall off.

[0144] A dust collection fan 51 is disposed on the lower side of the motor 6, and a lower air intake 77 is provided on the lower surface of the housing 2 to draw in air by the rotation of the dust collection fan 51. Therefore, even with the dust collection fan 51, it is not necessary to increase the radial size of the motor housing 35, thus maintaining a compact size. In addition, foreign objects such as dust are difficult to enter through the lower air intake 77, thereby ensuring a wide opening area.

[0145] A switch 74 is provided on the lower surface of the housing 2 to close the lower air intake 77 when the accessory 90 is not installed. A pin 122 (pin component) is provided on the protrusion 94 to move the switch 74 to the open position of the lower air intake 77 when the housing 2 is installed. Therefore, even with the lower air intake 77 installed, the dustproof and waterproof properties of the hammer drill 1 can be ensured. In addition, the switch 74 can be reliably opened by the pin 122 at the same time as the accessory 90 is installed.

[0146] In accessory 90, a sliding part 95 with an intake port 106 at the front end is disposed at a position offset to the left from the center in the left-right direction. Therefore, even with the sliding part 95, accessory 90 can be mounted on the front of housing 2.

[0147] (Examples of publicly disclosed changes to dust collection systems)

[0148] In the above embodiment, a groove-shaped concave engaging portion is formed on the housing side of the hammer drill, and a protruding convex engaging portion is formed on the accessory side. However, the opposite is also possible. That is, a protruding convex engaging portion can be formed on the housing side, and a groove-shaped concave engaging portion can be formed on the accessory side. Alternatively, the convex engaging portion and the concave engaging portion can be mixed and provided on the housing and accessory respectively.

[0149] In the above embodiment, the lower engaging parts engage with each other before the upper engaging parts engage with each other, but the opposite is also possible. Alternatively, the separated engaging parts may engage with each other at the same time.

[0150] The convex and concave engagement parts are not limited to a structure where each part is provided in pairs. For example, as long as the convex and concave engagement parts engage in a dovetail groove shape, they can be assembled and disassembled even if there is only one of each.

[0151] The engaging groove and engaging guide rail can also be modified in the same way. That is, the engaging guide rail can be formed on the housing side and the engaging groove can be formed on the accessory side. In this case, the engaging groove and engaging guide rail can also be omitted.

[0152] In the above embodiment, the convex-side engaging portion and the concave-side engaging portion are separated at two points in the vertical direction, but they can also be separated at three or more points. The left-right width and front-back positional relationship of the convex-side engaging portion and the concave-side engaging portion can also be appropriately changed. Therefore, the left-right width and front-back positional relationship of the convex-side engaging portion and the concave-side engaging portion can also be the same.

[0153] In the above embodiments, the accessories can be disassembled and assembled by moving them relative to the hammer drill in the up-down direction. However, the present invention can also be used even if disassembly and assembly can be performed by moving them relative to each other in the forward-backward or left-right directions. Therefore, the convex and concave engaging portions can be changed in orientation simply to correspond to the straight line direction of the accessories being disassembled and assembled.

[0154] In the accessories, the position of the sliding part can also be reversed left and right. As long as it does not hinder the installation of the accessories, the sliding part can also be positioned in the center in the left-right direction. The structure of the dust collection box can also be modified appropriately. Alternatively, the protrusion can be omitted, and the dust collection path can be connected between the front surface of the impact tool's housing and the back of the accessory's outer shell.

[0155] In the above embodiments, a dust collection fan is installed in the hammer drill, causing air to flow into the dust collection path on the accessory side when the accessory is installed. However, the present invention is not limited to this structure. For example, even if a motor and a dust collection fan are installed inside the housing of the accessory, and the motor and dust collection fan are rotated by obtaining power from the impact tool when the accessory is installed, the mounting structure of the engaging parts of the present invention can still be used.

[0156] The structure of the impact mechanism is not limited to the above embodiment. Motors other than brushless motors can also be used. The orientation of the motor can also be changed, and the dust collection fan can be located above the motor.

[0157] The dust collection system of this invention is not limited to electric hammer drills; other impact tools such as electric hammers can also be used. AC tools can also be used instead of DC tools.

[0158] Furthermore, the following structure can also be extracted from the dust collection system of the present invention.

[0159] (1) A dust collection system, comprising:

[0160] An impact tool comprising a housing for housing a motor, and an impact mechanism disposed within the housing and capable of impacting a pointed tool mounted at its front end by means of a reciprocating impact member; and

[0161] Dust collection accessories are installed on the aforementioned housing.

[0162] The dust collection system described above is characterized by,

[0163] The aforementioned dust collection accessory slides relative to the aforementioned housing in a predetermined linear direction, thereby enabling installation through the interlocking of a convex engaging portion provided on either the aforementioned housing or the aforementioned dust collection accessory, and a concave engaging portion provided on the other.

[0164] The aforementioned convex-side engaging portion and the aforementioned concave-side engaging portion are separated into multiple parts in the aforementioned straight direction. The aforementioned convex-side engaging portion and the aforementioned concave-side engaging portion include at least a first convex-side engaging portion and a first concave-side engaging portion that engage with each other in the aforementioned dust collection accessory installation state, and a second convex-side engaging portion and a second concave-side engaging portion that engage with each other in the aforementioned installation state.

[0165] (2) The dust collection system according to (1) is characterized in that,

[0166] The first convex-side engaging portion and the first concave-side engaging portion, as well as the second convex-side engaging portion and the second concave-side engaging portion, are provided in pairs on the left and right sides respectively.

[0167] (3) The dust collection system according to (2) is characterized in that,

[0168] The left and right widths of the pair of the first convex side engaging portions and the first concave side engaging portions are different from those of the pair of the second convex side engaging portions and the second concave side engaging portions.

[0169] (4) The dust collection system according to (3) is characterized in that,

[0170] The aforementioned straight line direction is the up-down direction. The left-right width of the pair of the first convex side engaging parts and the first concave side engaging parts that engage with each other on the upper side is smaller than the left-right width of the pair of the second convex side engaging parts and the second concave side engaging parts that engage with each other on the lower side.

[0171] (5) The dust collection system described in any one of (1) to (4) is characterized in that,

[0172] The positions of the first convex engaging portion and the first concave engaging portion, and the second convex engaging portion and the second concave engaging portion, in the front-rear direction are different from each other.

[0173] (6) The dust collection system according to any one of (1) to (5) is characterized in that,

[0174] When the dust collection accessory is installed by sliding relative to the housing in the aforementioned straight direction, any one of the first convex side engaging portion and the first concave side engaging portion, and the second convex side engaging portion and the second concave side engaging portion engages before the other.

[0175] (7) The dust collection system according to any one of (1) to (6) is characterized in that,

[0176] Before the dust collection accessory slides relative to each other in the aforementioned straight direction, at the predetermined position where it abuts against the aforementioned housing, the first convex engaging part and the first concave engaging part, and the second convex engaging part and the second concave engaging part are respectively located on the same line in the aforementioned straight direction.

[0177] (8) The dust collection system according to any one of (1) to (7) is characterized in that,

[0178] A third convex engaging portion extending along the impact axis of the impact mechanism is provided on either the housing or the dust collection accessory, and a third concave engaging portion engaging with the third convex engaging portion is provided on the other side when the dust collection accessory is installed in the housing.

[0179] (9) The dust collection system according to any one of (1) to (8) is characterized in that,

[0180] The dust collection accessory has a protrusion located on the lower side of the housing when installed in the housing state, and the protrusion is provided with a hook that is engaged with the housing in the housing state.

[0181] (10) The dust collection system according to (9) is characterized in that,

[0182] A dust collection fan is provided on the lower side of the motor, and an air intake is provided on the lower surface of the housing to draw in air by the rotation of the dust collection fan.

[0183] (11) The dust collection system according to (10) is characterized in that,

[0184] An opener / closer is provided on the lower surface of the housing. The opener / closer closes the air intake when the dust collection accessory is not installed. A pressing member is provided on the protrusion. When the housing is installed, the pressing member moves the opener / closer to the open position of the air intake.

[0185] (12) The dust collection system described in any one of (1) to (11) is characterized in that,

[0186] In the aforementioned dust collection accessories, a sliding part with a suction inlet at the front end is disposed at a position offset to either the left or right from the center in the left-right direction.

Claims

1. An impact tool, characterized in that, include: The housing, which allows for the installation of dust collection accessories; An impact mechanism is disposed within the housing and is capable of impacting a pointed tool mounted at the front end via a reciprocating impact member. A motor, configured within the housing such that its rotation axis intersects the impact axis of the impact mechanism; and A dust collection fan, which is disposed within the housing on the rotating shaft. The dust collection fan is positioned below the motor. A motor cooling fan is provided on the rotating shaft, and the motor cooling fan is adjacent to the dust collection fan in the axial direction of the rotating shaft.

2. An impact tool, characterized in that, include: The housing, which allows for the installation of dust collection accessories; An impact mechanism is disposed within the housing and is capable of impacting a pointed tool mounted at the front end via a reciprocating impact member. A motor, configured within the housing such that its rotation axis intersects the impact axis of the impact mechanism; and A dust collection fan, which is disposed within the housing on the rotating shaft. The dust collection fan is positioned below the motor. An air intake port, which draws in air through the rotation of the dust collection fan, is located on the lower surface of the housing.

3. The impact tool according to claim 1 or 2, characterized in that, An exhaust port for discharging air by the rotation of the dust collection fan is located on the lower surface of the housing.

4. The impact tool according to claim 3, characterized in that, A second exhaust port, through which air is discharged by the rotation of the dust collection fan, is provided on the side of the housing.

5. The impact tool according to claim 2, characterized in that, The air intake can be opened and closed using a disc-shaped opener / closer.

6. The impact tool according to claim 5, characterized in that, The switch is coaxially configured with the dust collection fan.

7. The impact tool according to claim 1 or 2, characterized in that, The left and right width of the dust collection fan storage section in the housing is greater than the left and right width of the motor storage section in the housing.

8. The impact tool according to claim 1 or 2, characterized in that, The bearing supporting the rotating shaft within the housing is positioned above the dust collection fan.

9. The impact tool according to claim 1 or 2, characterized in that, The dust collection accessory slides relative to the housing in a predetermined linear direction, thereby enabling installation through the interlocking of a convex engaging portion on one side of the housing and a concave engaging portion on the other side. The convex or concave engagement portion provided on the housing is configured to be separated into multiple portions in the linear direction.

10. The impact tool according to claim 1 or 2, characterized in that, The outer shell of the dust collection accessory is L-shaped when viewed from the side, and includes a main body extending in the vertical direction and a protrusion protruding rearward from the lower part of the main body.

11. The impact tool according to claim 1, characterized in that, The motor cooling fan and the dust collection fan are separated by a circular partition plate when viewed from above, forming a dual-fan configuration. The motor cooling fan and the dust collection fan are located on the same side of the motor.

12. A dust collection system, characterized in that, include: The impact tool according to any one of claims 1 to 11; as well as The dust collection accessory has an intake port relative to the tip tool and is mounted on the housing, and a suction force is generated at the intake port by the rotation of the dust collection fan.

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