Dust collection device and piercing tool system

Abstract

The present application provides an auxiliary device and a working machine system, which can inhibit the size of the body from being enlarged and improve the dust collection performance. The dust collection device is composed of the following components: a suction pipe connected to a suction part; a cyclone part that rotates the air flowing from the suction pipe to centrifugally separate dust; and a filter part that houses a filter. The filter part is connected to the cyclone part and has a discharge port that discharges the air passing through the filter. Therefore, the air around the tip tool can be separated from the dust in the cyclone part. Moreover, even in the case of residual dust, the residual dust can be removed by the filter. Furthermore, the suction pipe and the cyclone part are arranged at a position overlapping in the front-rear direction, and the filter part is arranged at the rear side of the cyclone part. Therefore, compared with the case where the filter part is arranged at the lower side of the cyclone part, the size of the dust collection device in the up-down direction can be inhibited from being enlarged.

Description

Technical Field

[0001] This invention relates to a dust collection device and a perforation tool system. Background Technology

[0002] The piercing tool (working machine) described in Patent Document 1 below includes a dust collection device (auxiliary device). Furthermore, the dust collection device draws in air containing dust generated during the operation of the piercing tool, removes the dust from the air, and stores the dust. More specifically, a filter is provided inside the dust collection device, and dust is removed from the air drawn into the dust collection device through the filter.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-201526 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, in the aforementioned dust collection device, there is a possibility that the dust collection performance will decrease due to filter clogging. To address this, increasing the volume of the filter chamber housing the filter can improve dust collection performance, but this results in a larger dust collection device size. Furthermore, as a method for separating air and dust, a separation method using a so-called cyclone mechanism is known, which separates air containing dust by rotating the air and using centrifugal force. Moreover, when applying the cyclone mechanism to auxiliary devices for work machinery, there is still room for improvement in the following aspects. Specifically, in work machinery performing tasks such as drilling, the machine is sometimes used in different postures depending on the work operation. For example, sometimes the machine is used with the outlet facing upwards from the rotary chamber towards the dust collection chamber. In this case, the dust separated in the rotary chamber may not be properly discharged into the dust collection chamber and may remain in the rotary chamber, thus potentially preventing proper separation of dust and air. Furthermore, there is a possibility that the dust-laden airflow may flow downstream relative to the cyclone section. That is, there is a possibility that the dust collection performance of the auxiliary device will decrease.

[0008] In view of the aforementioned facts, the present invention aims to provide an auxiliary device capable of suppressing the enlargement of the device and improving dust collection performance, as well as a working machine including the auxiliary device.

[0009] Technical means to solve the problem

[0010] One or more embodiments of the present invention are auxiliary devices installed on a working machine to draw in air containing dust from around a top tool of the working machine and discharge air in which the dust has been separated. The auxiliary device includes: a suction unit having a suction port disposed around the top tool; a suction passage unit connected to the suction unit and configured to extend and retract along a first direction; a cyclone unit connected to the suction passage unit to rotate the air flowing out of the suction passage unit and centrifugally separate the dust; and a filter unit connected to the cyclone unit, having an internal filter chamber configured to house a filter and having an outlet for discharging the air that has passed through the filter. The cyclone unit and the suction passage unit are disposed in overlapping positions in the first direction, and the filter unit is disposed on one side of the cyclone unit in the first direction.

[0011] In one or more embodiments of the auxiliary device of the present invention, the air intake passage is disposed on the opposite side of the first direction relative to the filter.

[0012] In one or more embodiments of the auxiliary device of the present invention, the cyclone section is configured with the following components: a cyclone outer cylinder, formed as a cylinder centered on a cyclone axis along the first direction, wherein one end of the first direction is blocked; a cyclone inlet section, communicating the intake passage section with the cyclone outer cylinder, having a guide surface that extends from the inner circumference of the cyclone outer cylinder in a tangential direction when viewed along the first direction; and a cyclone outlet section, formed at one end of the cyclone outer cylinder in the first direction, communicating the cyclone outer cylinder with the filter section.

[0013] In one or more embodiments of the auxiliary device of the present invention, the cyclone section has a plurality of cyclone outer cylinders, cyclone inlet sections and cyclone outlet sections of the same number.

[0014] In one or more embodiments of the auxiliary device of the present invention, when viewed along the first direction, the air intake passage and the cyclone section are arranged along a second direction intersecting the first direction, and the cyclone section has a pair of cyclone outer cylinders, which are arranged along a third direction intersecting the first and second directions.

[0015] In one or more embodiments of the auxiliary device of the present invention, in the third direction, the center of the air intake passage is disposed between the cyclone shafts of the pair of cyclone outer cylinders.

[0016] In one or more embodiments of the auxiliary device of the present invention, the cyclone outer cylinder has: a first cylinder portion constituting one side portion of the cyclone outer cylinder in the first direction and having a fixed inner diameter; and a second cylinder portion constituting the other side portion of the cyclone outer cylinder in the first direction, wherein the inner diameter of one side end portion in the first direction is larger than the inner diameter of the other side end portion in the first direction, a gap is formed between the first cylinder portion and the second cylinder portion, and the inner diameter of one side end portion of the second cylinder portion in the first direction is set to be larger than the inner diameter of the first cylinder portion.

[0017] In one or more embodiments of the auxiliary device of the present invention, when viewed along the first direction, the intake passage and the cyclone section are arranged along a second direction intersecting the first direction, the filter is formed as a pleat folded along the first direction, the cyclone outlet is disposed on one side of the second direction relative to the filter, and the outlet is disposed on the other side of the second direction relative to the filter.

[0018] In one or more embodiments of the auxiliary device of the present invention, when viewed along the first direction, the filter section coincides with the cyclone section and the air intake passage section.

[0019] One or more embodiments of the present invention are a working machine, comprising: a motor having a drive shaft; a tip tool driven by rotation of the drive shaft; a mechanism that drives the tip tool by rotation of the drive shaft; a housing housing the motor and the mechanism, and an auxiliary device for mounting the structure, having an air intake connected to the exhaust port of the auxiliary device; and a fan housing within the housing that generates an airflow from the suction port of the auxiliary device toward the air intake port by rotation of the drive shaft.

[0020] In one or more embodiments of the work machine of the present invention, the housing is composed of the following components: a main body housing portion that houses the motor and the mechanism portion; and a handle housing portion that extends from one side end of the main body housing portion in a first direction and has a handle portion for the operator to hold, wherein in the first direction, the filter portion is located between the cyclone portion and the handle portion.

[0021] In one or more embodiments of the working machine of the present invention, the main body housing portion extends along the first direction.

[0022] In one or more embodiments of the work machine of the present invention, the fan, the air intake, and the filter are arranged in overlapping positions in the first direction.

[0023] In one or more embodiments of the work machine of the present invention, in the first direction, the filter section is disposed between the fan and the mechanism section.

[0024] The effects of the invention

[0025] According to one or more embodiments of the present invention, it is possible to suppress the enlargement of the body size and improve the dust collection performance. Attached Figure Description

[0026] Figure 1 This is a side view taken from the right side, showing the dust collection device of this embodiment installed on the hammer drill.

[0027] Figure 2 It means Figure 1 The diagram shows a longitudinal section of the interior of the hammer drill and dust collection device.

[0028] Figure 3 (A) represents Figure 2 The rear view of the hammer drill's fan, as seen from the rear side. Figure 3 (B) is from Figure 3 (A) Front view of the fan viewed from the front side.

[0029] Figure 4 yes Figure 3 (B) shows a side sectional view of the fan. Figure 3 (4-4 line section view of (B)).

[0030] Figure 5 From Figure 1 A perspective view of the dust collection device viewed from the right oblique front.

[0031] Figure 6 It means Figure 2 A cross-sectional view of the cyclone section of the dust collection device as seen from the front. Figure 2 (Sectional view along line 6-6).

[0032] Figure 7 It means Figure 2 A cross-sectional view of the cyclone section of the dust collection device as seen from below. Figure 2 (Sectional view along line 7-7).

[0033] Figure 8 express Figure 2 A cross-sectional view of the fan section of the dust collection device as seen from the front. Figure 2 (8-8 line cross-section).

[0034] Figure 9 This is a side view of the hammer drill system according to the second embodiment, viewed from the left.

[0035] Figure 10 It means Figure 9 The diagram shows a side cross-section of the interior of the hammer drill system, viewed from the left.

[0036] Figure 11 It is Figure 10 The diagram shows an enlarged side sectional view of the adapter of the hammer drill system.

[0037] Figure 12 It means Figure 10 A cross-sectional view from the front showing the connection between the adapter and the hammer drill of the hammer drill system. Figure 10 (4-4 line cross-section).

[0038] Figure 13 It means Figure 10 The adapter of the dust collection device shown is shown in three views.

[0039] Figure 14 From Figure 13 The adapter shown is viewed from below in a bottom view.

[0040] Figure 15 yes Figure 13 The side sectional view of the adapter shown ( Figure 13 (Sectional view along line 9-9).

[0041] Figure 16 From Figure 13 A cross-sectional view of the adapter as shown from the rear. Figure 13 (Sectional view along line 1-1).

[0042] Figure 17 It means Figure 10 A cross-sectional view of the dust collection section of the dust collection device shown from below. Figure 10 (Sectional view along line 11-11).

[0043] Figure 18 This indicates a state where the left-side shell component has been removed. Figure 10 The image shows a perspective view of the rear end of the dust collection device body, viewed from the left rearward angle.

[0044] Figure 19 It is used to... Figure 9 The side view shown illustrates the installation of the adapter on the hammer drill.

[0045] Figure 20 It is used to... Figure 17 The side view shows the dust collection device body mounted on the adapter.

[0046] [Explanation of Symbols]

[0047] 10: Hammer drill (operating machinery)

[0048] 12: Shell

[0049] 13: Body shell section

[0050] 13B: Second drill bit side air intake (air intake)

[0051] 14: Handle housing

[0052] 14A: Handle

[0053] 20: Motor

[0054] 21: Drive shaft

[0055] 30: Drive Mechanism Department (Mechanism Department)

[0056] 40: Dust collection device (auxiliary device)

[0057] 52: Suction section

[0058] 52B: Suction port

[0059] 53: Inhalation tube (inhalation passage section)

[0060] 60: Cyclone section

[0061] 61: Cyclone outer cylinder

[0062] 61A: Cyclone Shaft

[0063] 62: Rear outer cylinder (first cylinder section)

[0064] 63: Front outer cylinder (second cylinder part)

[0065] 64: Cyclone Inlet

[0066] 64B: Guide surface

[0067] 66: Cyclone outlet hole (cyclone outlet section)

[0068] 70: Filter Section

[0069] 71: Filter Chamber

[0070] 72: Filter

[0071] 74: Discharge outlet

[0072] G1: Gap

[0073] T: Top Tools

[0074] 142: Adapter Body

[0075] 142A: Shaft fixing part

[0076] 142B: Mounting Recess

[0077] 142C: Track groove

[0078] 142C1: Side track groove

[0079] 142C2: Rear track groove

[0080] 142D: Adapter Connector

[0081] 142E: Configuration recess

[0082] 142F: Spacer Reception Section

[0083] 142G: Regional Division Rib

[0084] 142H: Spring housing section

[0085] 142J: Locking slot

[0086] 143: Support shaft

[0087] 144: Front spacer

[0088] 145: Rear spacer

[0089] 150: Dust collection device body

[0090] 151: Dust collection housing

[0091] 151A: Support cylinder section

[0092] 151B: Connecting part

[0093] 151C: Step Difference Part

[0094] 151D: First exposed hole

[0095] 151E: Second exposed hole

[0096] 152: Air Inlet Section

[0097] 153: Sliding Arm

[0098] 154: Suction section

[0099] 154A: Connecting cylinder section

[0100] 154B: Suction port

[0101] 155: Inhalation tube

[0102] 61C: Opening

[0103] 61A: Cyclone Shaft Detailed Implementation

[0104] Hereinafter, the dust collection device 40, which is an "auxiliary device" in this embodiment (first embodiment), will be described using the accompanying drawings. Figure 1 As shown, the dust collection device 40 is installed on the hammer drill 10, which is a "working machine", and is configured to draw air from the area around the top tool T installed on the hammer drill 10.

[0105] Additionally, the arrows UP, FR, and RH appropriately shown in the accompanying drawings represent the upper, front, and right sides of the hammer drill 10 and the dust collection device 40. In the following description, when using the directions of up / down, front / back, and left / right, unless otherwise specified, they represent the up / down, front / back, and left / right directions of the hammer drill 10 and the dust collection device 40. Furthermore, the front / back direction corresponds to the first direction of the present invention, the up / down direction corresponds to the second direction of the present invention, and the left / right direction corresponds to the third direction of the present invention. Hereinafter, the hammer drill 10 will be described first, followed by the dust collection device 40.

[0106] (Regarding the hammer drill 10) The hammer drill 10 is configured as a tool for drilling holes in a workpiece. For example... Figure 1 and Figure 2 As shown, the hammer drill 10 comprises a housing 12, a motor 20, a drive mechanism 30 which is a "mechanism" driven by the driving force of the motor 20, and a battery pack 34. The structure of the hammer drill 10 will be described below.

[0107] (Regarding housing 12) In a side view viewed from the right, housing 12 is formed into a hollow, generally inverted L-shaped form. Specifically, housing 12 is composed of a main body housing portion 13 extending in the front-rear direction and a handle housing portion 14 extending downward from the rear end (one side end in the front-rear direction) of the main body housing portion 13.

[0108] Multiple (four in this embodiment) first drill bit side air intake ports 13A are formed through the left and right side walls of the rear end portion of the main body housing 13. The first drill bit side air intake ports 13A are elongated holes extending along the longitudinal direction and are arranged vertically. Furthermore, a second drill bit side air intake port 13B (see reference) serving as an "air intake port" is formed through the lower wall of the middle portion of the main body housing 13 in the longitudinal direction. Figure 2 and Figure 8 The second drill bit side air intake 13B is roughly rectangular in shape.

[0109] Furthermore, a plurality of first exhaust ports 13C (four in this embodiment) are formed through the right wall of the middle portion of the main body housing 13 in the front-rear direction. The first exhaust ports 13C are formed as elongated holes in the front-rear direction and are arranged in the vertical direction. Moreover, in the main body housing 13, a plurality of second exhaust ports 13D (which can be understood as "exhaust ports" in a broad sense) are formed through the front side of the first exhaust ports 13C. The second exhaust ports 13D are formed as elongated holes in the front-rear direction and are arranged in the vertical direction. Furthermore, the second exhaust ports 13D are positioned slightly behind the second drill bit side intake port 13B.

[0110] The upper part of the handle housing 14 is configured as a handle 14A for the user to grip. A trigger 15 is provided at the upper end of the handle 14A. The trigger 15 protrudes forward from the handle 14A and is configured to be operated by flicking backward. A switch mechanism 16 is provided behind the trigger 15. The switch mechanism 16 has a switch (not shown) operated by the trigger 15. The switch is electrically connected to the control unit of the hammer drill (not shown) and is configured to output an output signal corresponding to the operating state of the trigger 15 to the control unit.

[0111] The lower end of the handle housing portion 14 is configured as a battery mounting portion 14B for mounting the battery pack 34 described below. The battery mounting portion 14B protrudes forward from the lower end of the handle housing portion 14 and bends downward. Furthermore, a connector 17 for connecting to the battery pack 34 is provided in the battery mounting portion 14B.

[0112] (Regarding motor 20) Motor 20 is configured as a three-phase brushless motor, housed within the rear portion of the main body housing 13, and electrically connected to the control unit. Motor 20 has a drive shaft 21 with the rear-to-rear direction as its axial direction. The front end portion of the drive shaft 21 is rotatably supported by a front bearing 18 fixed to the main body housing 13, and the rear end portion of the drive shaft 21 is rotatably supported by a rear bearing 19 fixed to the main body housing 13. Furthermore, a pinion 21A is formed at the front end portion of the drive shaft 21.

[0113] like Figure 2 , Figure 3 (A) and Figure 3 (B) Figure 4 ,and Figure 8 As shown, a fan 23 is integrally rotatable on the front end of the drive shaft 21. The fan 23 is formed as a disc with its thickness along the rear-to-rear direction. The fan 23 is composed of a first fan section 23A constituting the rear of the fan 23 and a second fan section 23B constituting the front of the fan 23, and the first fan section 23A and the second fan section 23B are configured as centrifugal fans.

[0114] The first fan section 23A comprises a base plate 24 and a plurality of first fins 25. The base plate 24 is formed in a generally annular shape with the thickness direction in the rear-to-rear direction. The first fins 25 are formed on the rear surface of the base plate 24 and extend radially along the base plate 24. Moreover, the plurality of first fins 25 are arranged at predetermined angles in the circumferential direction of the base plate 24. Furthermore, the first exhaust port 13C of the housing 12 is arranged radially outward of the fan 23 relative to the first fins 25. And its structure is such that if the fan 23 rotates together with the drive shaft 21, an airflow flowing radially outward of the fan 23 is generated by the first fins 25. Thus, its structure allows air to flow into the main housing section 13 from the first drill bit side intake port 13A through the first fan section 23A, and the air to flow out from the first exhaust port 13C, thereby cooling the motor 20.

[0115] The second fan section 23B comprises a base plate 24, a plurality of second fins 26, and a fan shroud 27. Specifically, the base plate 24 serves as a common portion of the first fan section 23A and the second fan section 23B. The second fins 26 are formed on the front surface of the base plate 24 and extend radially along the base plate 24. Furthermore, the plurality of second fins 26 are arranged at predetermined angles along the circumference of the base plate 24. Additionally, the second exhaust port 13D of the housing 12 is arranged radially outward of the fan 23 relative to the second fins 26.

[0116] The fan shroud 27 is formed in a generally annular plate shape and is connected to the front end of the second fin 26. Viewed from the side, the fan shroud 27 is slightly inclined forward towards the radially inward direction. Furthermore, the central opening of the fan shroud 27 is configured as a fan intake 27A, and the inner diameter of the fan intake 27A is set to be larger than the diameter of the drive shaft 21. The front end of the fan shroud 27 is positioned above the second drill-side intake 13B of the housing 12. That is, viewed from above, the front end of the fan shroud 27 coincides with the second drill-side intake 13B. In other words, in the front-rear direction, the second fan portion 23B and the second drill-side intake 13B are positioned at the same point.

[0117] Furthermore, it is configured such that when the fan 23 rotates together with the drive shaft 21, air flows into the interior of the second fan section 23B from the fan intake 27A, and flows radially outward from the fan 23 via the second fins 26. Thus, an airflow AR is generated by the second fan section 23B, flowing from the second drill-side intake 13B of the housing 12 into the main housing section 13. The airflow AR then passes through the interior of the second fan section 23B and is discharged from the second exhaust port 13D.

[0118] (Regarding the drive mechanism section 30) as follows Figure 2As shown, the drive mechanism 30 is configured to transmit the rotational force of the motor 20 to the tip tool T, thereby driving the tip tool T. The drive mechanism 30 is housed within the front end of the main body housing 13. More specifically, the drive mechanism 30 is disposed on the front side of the fan 23. The drive mechanism 30 includes an intermediate shaft 31 and a transmission part 32.

[0119] The intermediate shaft 31 is formed into a generally cylindrical shape with the back-to-back direction as its axial direction, and is rotatably supported by a bearing (not shown) fixed to the main housing 13. A gear (not shown) is integrally rotatable at the rear end of the intermediate shaft 31, and the gear meshes with a pinion 21A on the drive shaft 21. As a result, the motor 20 drives the shaft 21 to rotate, thus creating a structure in which the intermediate shaft 31 rotates about its own axis. A motion conversion member (not shown) is provided on the intermediate shaft 31, which is structured to convert the rotational motion of the intermediate shaft 31 into a reciprocating motion in the back-to-back direction and transmit it to the transmission part 32 described below.

[0120] The transmission section 32 extends along the front-rear direction on the upper side of the intermediate shaft 31. A tip tool T is held at the front end of the transmission section 32. The tip tool T is formed as a generally cylindrical shape with the front-rear direction as its axial direction, and its rear end is held by the transmission section 32. Furthermore, the transmission section 32 is connected to the intermediate shaft 31. Thus, the rotational force of the motor 20 is transmitted to the tip tool T, which rotates around its own axis, thereby performing hole drilling on the workpiece.

[0121] (Regarding battery pack 34) Battery pack 34 is generally rectangular. It is mounted from the rear to the battery mounting portion 14B of the handle housing portion 14. Battery pack 34 has a connector (not shown), which, when mounted in the battery mounting portion 14B, connects to connector 17, supplying power from battery pack 34 to motor 20. Furthermore, battery pack 34 has a pair of engaging members 34A, located on the left and right sides of battery pack 34. When battery pack 34 is mounted in the battery mounting portion 14B, the engaging members 34A engage with the handle housing portion 14, restricting rearward movement of battery pack 34.

[0122] (Regarding dust collection device 40) such as Figure 1 , Figure 2 , Figure 5 , Figure 8As shown, the dust collection device 40 is installed on the body housing 13 of the hammer drill 10, and is positioned on the lower side of the body housing 13. Furthermore, as will be described in detail below, the interior of the dust collection device 40 is connected to the interior of the body housing 13 via a second drill bit-side air intake 13B. Airflow AR generated by the second fan portion 23B of the fan 23 causes air from the dust collection device 40 to flow into the body housing 13 from the second drill bit-side air intake 13B. More specifically, the air and dust surrounding the tip tool T are drawn into the dust collection device 40 by the airflow AR. Within the dust collection device 40, the drawn-out air is separated from the dust, and the separated air flows out into the body housing 13 from the second exhaust port 13D.

[0123] The dust collection device 40 extends in the front-to-back direction and is disposed adjacent to the lower side of the main body housing 13. The dust collection device 40 is composed of a dust collection housing 42, an air inlet 50, a cyclone section 60, and a filter section 70. The structure of the dust collection device 40 will be described below.

[0124] (Regarding the dust collection housing 42) The dust collection housing 42 forms the upper outline of the dust collection device 40. The dust collection housing 42 is formed into a generally box-shaped structure that opens to the lower side. A pair of left and right connecting structural members 43 are provided at the upper rear end of the dust collection housing 42 (see reference). Figure 5 The connecting member 43 is rotatable in the rear-to-rear direction and is connected to the dust collection housing 42. A hook portion 43A is formed at the upper end of the connecting member 43. The dust collection device 40 is disposed adjacent to the lower side of the main housing portion 13, and the hook portion 43A is engaged with the main housing portion 13. The dust collection housing 42 (i.e., the dust collection device 40) is mounted on the hammer drill 10. A cylindrical support portion 42A is formed at the front of the dust collection housing 42, and the support portion 42A is disposed at a position further forward of the hammer drill 10 than the main housing portion 13.

[0125] (Regarding the air inlet section 50) The air inlet section 50 is configured to allow air to flow in from around the tip tool T and to allow the air to flow out to the cyclone section 60 described below. The air inlet section 50 forms the upper part of the front side of the dust collection device 40. The air inlet section 50 includes a sliding arm 51, a suction section 52, and a suction pipe 53 that serves as a "suction passage".

[0126] The sliding arm 51 is formed into a cylindrical shape with the front-to-back direction as the axis. The sliding arm 51 is connected to the support cylinder portion 42A of the dust collection housing 42 in a manner that allows it to slide along the front-to-back direction, and the front end of the sliding arm 51 protrudes further forward than the support cylinder portion 42A.

[0127] The suction section 52 is formed into a cylindrical shape with the vertical direction as the axial direction, and the lower end of the suction section 52 is connected to the front end of the slide arm 51 by means of a claw engagement or the like. A connecting cylinder section 52A is formed at the lower end of the suction section 52. The connecting cylinder section 52A is formed into a generally cylindrical shape with the rearward direction as the axial direction, protrudes rearward from the suction section 52, and is disposed inside the front end of the slide arm 51. Moreover, the interior of the connecting cylinder section 52A is in communication with the interior of the suction section 52.

[0128] The upper opening of the suction section 52 is configured as a suction port 52B. Furthermore, a tool insertion section 52C is formed at the upper end of the suction section 52. The tool insertion section 52C is formed into a generally cylindrical shape with the rear-to-rear direction as the axial direction, and the suction port 52B opens radially inward into the tool insertion section 52C. The tip of the tip tool T is inserted into the interior of the tool insertion section 52C. Thus, air surrounding the tip tool T flows into the suction section 52 through the suction port 52B.

[0129] The suction pipe 53 comprises a rear suction pipe 54 constituting the rear portion of the suction pipe 53 and a front suction pipe 55 constituting the front portion of the suction pipe 53. The rear suction pipe 54 is formed into a generally cylindrical shape with the rear-to-rear direction as the axial direction. The rear suction pipe 54 is housed within the support cylinder portion 42A of the dust collection housing 42 and is fixed to the dust collection housing 42. That is, the rear suction pipe 54 is disposed on the lower side of the front portion of the main body housing portion 13. A downwardly protruding pipe outlet portion 54A is formed at the rear end of the rear suction pipe 54. The pipe outlet portion 54A is formed into a generally rectangular cylinder shape, and the interior of the rear suction pipe 54 communicates with the interior of the pipe outlet portion 54A.

[0130] The front intake pipe 55 is formed into a generally cylindrical shape with the rear-to-rear direction as its axial direction. The front intake pipe 55 is coaxially positioned with the rear intake pipe 54 on its front side, and the rear end of the front intake pipe 55 is externally attached to the front end of the rear intake pipe 54. The front intake pipe 55 is formed of a stretchable rubber material or the like, and is configured to extend and retract in the rear-to-rear direction. Therefore, the intake pipe 53, including the front intake pipe 55, is configured to extend and retract in the rear-to-rear direction. The front end of the front intake pipe 55 is externally inserted into the connecting tube portion 52A of the suction unit 52. Thus, air drawn into the suction unit 52 from the suction port 52B flows rearward through the intake pipe 53 and exits downward from the pipe outlet portion 54A.

[0131] (Regarding the cyclone section 60) The cyclone section 60 is formed in the shape of a generally rectangular box that opens to the front and is disposed below the rear intake pipe 54. That is, the cyclone section 60 and the intake pipe 53 are disposed at the same position in the front-rear direction. In other words, the cyclone section 60 and the intake pipe 53 are arranged in the vertical direction. Moreover, the cyclone section 60 is disposed above the lower surface of the battery pack 34.

[0132] A cover 68 is provided at the front end of the cyclone section 60 in an openable and closable manner. The cover 68 is formed into a generally rectangular plate with the thickness direction in the front-to-back direction, and the upper end of the cover 68 is connected to the cyclone section 60 in a manner that allows it to rotate axially in the left-to-right direction. Moreover, the lower end of the cover 68 is engaged with the cyclone section 60. Thus, the front opening of the cyclone section 60 is blocked by the cover 68. Furthermore, the cyclone section 60 has a pair of left and right cyclone outer cylinders 61, a pair of left and right cyclone inlets 64, and a pair of left and right cyclone exhaust inner cylinders 65.

[0133] (Regarding the cyclone outer cylinders 61) A pair of cyclone outer cylinders 61 are disposed inside the cyclone section 60, and are positioned symmetrically about the center of the dust collection device 40 in the left-right direction. Specifically, in top view, the centerline of the suction pipe 53 described above is disposed between the pair of cyclone outer cylinders 61. The cyclone outer cylinder 61 is generally cylindrical in the front-back direction, and the central axis of the cyclone outer cylinder 61 serves as the cyclone axis 61A. Moreover, the cyclone outer cylinder 61 includes a rear outer cylinder 62, which constitutes the rear part of the cyclone outer cylinder 61 as a "first cylinder section", and a front outer cylinder 63, which constitutes the front part of the cyclone outer cylinder 61 as a "second cylinder section".

[0134] The rear outer cylinder 62 is formed into a cylindrical shape centered on the cyclone axis 61A, protruding forward from the rear wall of the cyclone section 60. In other words, the rear outer cylinder 62 is formed into a bottomed cylindrical shape with its rear (axial side) end blocked and open to the front. Moreover, the inner diameter of the rear outer cylinder 62 is fixed in the front-rear direction. That is, the inner circumferential surface of the rear outer cylinder 62 is arranged parallel to the cyclone axis 61A.

[0135] The front outer cylinder 63 is formed in a generally conical shape centered on the cyclone axis 61A and is positioned in front of the rear outer cylinder 62. Furthermore, a portion of the front outer cylinder 63 forms part of the left and right sidewalls of the cyclone section 60. The sidewalls of the front outer cylinder 63 slope radially inward towards the front. That is, the inner circumferential surface of the front outer cylinder 63 slopes towards the cyclone axis 61A towards the front. In other words, the inner diameter of the rear end of the front outer cylinder 63 is set to be larger than the inner diameter of the front end of the front outer cylinder 63.

[0136] Furthermore, the inner diameter of the rear end of the front outer cylinder 63 is set to be larger than the inner diameter of the rear outer cylinder 62, and the front end of the rear outer cylinder 62 is disposed inside the rear end of the front outer cylinder 63. That is, in the front-rear direction, the front end of the rear outer cylinder 62 coincides with the rear end of the front outer cylinder 63, and a gap G1 is formed between the front end of the rear outer cylinder 62 and the rear end of the front outer cylinder 63. Furthermore, the rear ends of the left and right pairs of front outer cylinders 63 are connected to each other at the central part in the left-right direction of the dust collection device 40. Moreover, the interior of the cyclone outer cylinder 61 is configured as a cyclone chamber 60A, and the lower part of the cyclone outer cylinder 61 inside the cyclone section 60 is configured as a dust collection chamber 60B.

[0137] (Regarding the cyclone inlet 64) Cyclone inlets 64 are respectively provided on a pair of left and right rear outer cylinders 62. The cyclone inlet 64 is formed into a generally rectangular cylindrical shape with the vertical direction as its axis, extending upwards from the rear outer cylinder 62 and adjacent to the lower side of the outlet 54A of the rear suction pipe 54. Specifically, the cyclone inlet 64 extends upwards from the inner side (central side of the dust collection device 40 in the left-right direction) of the rear outer cylinder 62, and the interior of the rear outer cylinder 62 communicates with the interior of the cyclone inlet 64. That is, the rear outer cylinder 62 is positioned relative to the cyclone axis 61A at a position biased towards the central side of the dust collection device 40 in the left-right direction. Thus, the suction pipe 53 is connected to the cyclone section 60.

[0138] Furthermore, the inner sidewalls of the rear outer cylinder 62 in the left-right direction are configured as guide walls 64A, and the inner circumferential surface of guide wall 64A is configured as guide surface 64B. In a forward view, guide surface 64B is inclined inward in the left-right direction as it faces upward, and its lower end is connected to the inner circumferential surface of the rear outer cylinder 62. Specifically, in a forward view, guide surface 64B extends upward from its lower end along the tangential direction of the inner circumferential surface of the rear outer cylinder 62.

[0139] Thus, the air flowing from the outlet 54A into the cyclone inlet 64 flows along the guide surface 64B into the rear outer cylinder 62. Specifically, the air flowing into the rear outer cylinder 62 rotates along the inner circumferential surface of the rear outer cylinder 62 while flowing forward. Furthermore, the air flowing from the front end of the rear outer cylinder 62 into the interior of the front outer cylinder 63 rotates along the inner circumferential surface of the front outer cylinder 63 while flowing forward. Therefore, within the cyclone chamber 60A, air and dust are separated, and the dust is discharged from the front opening of the front outer cylinder 63 and accumulated on the lower surface of the dust collection chamber 60B. Additionally, the upper ends of the guide walls 64A are connected to each other at the left and right pair of cyclone inlets 64.

[0140] (Regarding the cyclone exhaust inner cylinder 65) The cyclone exhaust inner cylinder 65 is respectively disposed inside a pair of rear outer cylinders 62. The cyclone exhaust inner cylinder 65 is formed into a cylindrical shape centered on the cyclone axis 61A, protruding forward from the rear wall of the cyclone section 60. Moreover, the cyclone exhaust inner cylinder 65 extends through in the front-rear direction. As a result, a cyclone outlet hole 66, which serves as a "cyclone outlet section", is formed at the rear end of the cyclone exhaust inner cylinder 65, and the interior of the cyclone section 60 (cyclone chamber 60A) is connected to the interior of the filter section 70 described below through the cyclone outlet hole 66. Furthermore, the structure is such that the air with separated dust flows rearward through the central part of the cyclone outer cylinder 61, flows rearward through the cyclone exhaust inner cylinder 65, and flows out into the filter section 70 described below.

[0141] (Regarding the filter section 70) The filter section 70 is formed in a generally rectangular box shape with the vertical direction as its length, and is disposed behind the air intake pipe 53 and the cyclone section 60 of the air inlet section 50. That is, the filter section 70 is disposed between the handle section 14A of the hammer drill 10 and the air intake pipe 53 and the cyclone section 60. Furthermore, when viewed from the front, the filter section 70 coincides with the air intake pipe 53 and the cyclone section 60.

[0142] The interior of the filter section 70 is configured as a filter chamber 71. The front wall of the filter section 70 and the rear wall of the cyclone section 60 are configured as a common wall. That is, the interior of the cyclone section 60 (cyclone chamber 60A) and the filter chamber 71 are connected through the cyclone outlet hole 66 described above. Thus, the structure allows air flowing out of the cyclone section 60 to flow into the filter chamber 71.

[0143] A filter 72 is disposed at the middle of the vertical direction of the filter chamber 71. The filter 72 is formed as a sheet and folded into a pleated shape. Specifically, in a side view, the filter 72 is folded into a pleated shape such that the upper end of the filter 72 is formed by the folds that form mountain pleats and the lower end of the filter 72 is formed by the folds that form valley pleats, and the pleats overlap in the front-back direction. Moreover, a portion of the filter 72 (the lower end) is disposed above the lower end of the cyclone outlet hole 66. Specifically, in a front view, the upper part of the cyclone outlet hole 66 coincides with the lower end of the filter 72, and the lower end of the cyclone outlet hole 66 is disposed below the filter 72 (on one side in the vertical direction). Therefore, the phrase "the cyclone outlet portion is disposed on one side in the second direction relative to the filter" in this invention also includes the case where a portion of the cyclone outlet hole 66 is disposed below the filter 72.

[0144] A discharge section 73 is formed at the upper end of the filter chamber 71. The discharge section 73 is formed into a rectangular cylinder extending vertically and protrudes upward from the dust collection housing 42. Furthermore, the upper opening of the discharge section 73 is configured as a discharge port 74. The upper end of the discharge section 73 is embedded within the second drill bit side air intake 13B of the hammer drill 10. Thus, the interior of the main body housing 13 of the hammer drill 10 and the interior of the dust collection device 40 are connected through the discharge port 74 and the second drill bit side air intake 13B. Therefore, air flowing into the filter chamber 71 from the cyclone section 60 flows upward and passes through the filter 72. The air passing through the filter 72 then flows into the main body housing 13 through the discharge port 74.

[0145] Furthermore, the rear end of the dust collection housing 42 is positioned further rearward than the filter section 70. Moreover, the rear end of the dust collection housing 42 is positioned at the front, separated from the trigger 15 of the handle section 14A by a gap G2. The front-to-back dimension of the gap G2 is set to a predetermined size such that the user's finger, inserted into the gap G2, can actuate the trigger 15.

[0146] (Effect) In the hammer drill 10 configured as described above, if the operation trigger 15 is activated, the motor 20 is driven, causing the tip tool T to rotate around its own axis. This allows for hole drilling on the workpiece. Specifically, the tip tool T is pressed against the workpiece side to perform hole drilling. Furthermore, when the motor 20 is driven, the fan 23 rotates together with the drive shaft 21 of the motor 20.

[0147] Furthermore, a dust collection device 40 is installed on the hammer drill 10, and the dust collection device 40 is located on the lower side of the main body housing 13 and the front side of the handle housing 14. With the dust collection device 40 installed on the hammer drill 10, the upper end of the discharge portion 73 of the dust collection device 40 is inserted into the second drill bit side air intake 13B of the hammer drill 10, thus communicating the interior of the hammer drill 10 with the interior of the dust collection device 40. Furthermore, the tip of the tip tool T is inserted into the tool insertion portion 52C of the dust collection device 40. And, when the hammer drill 10 is working, the second fan portion 23B of the fan 23 generates an airflow AR from the dust collection device 40 toward the hammer drill 10 (see reference). Figure 2 Specifically, at the suction port 52B of the dust collection device 40, an airflow AR is generated that draws air radially inward from the tool insertion part 52C into the interior of the suction part 52.

[0148] As a result, the air surrounding the tip of the tip tool T is drawn into the dust collection device 40 through the suction port 52B. That is, the dust surrounding the tip tool T, including the dust generated during the drilling process, flows into the suction section 52 along with the air through the suction port 52B. Furthermore, during the drilling process on the workpiece, as the drilling progresses, the hammer drill 10 approaches the workpiece, causing the tool insertion section 52C of the dust collection device 40 to come into contact with the workpiece. Therefore, during the drilling process with the hammer drill 10, the workpiece presses the suction section 52 backward. As a result, the front suction pipe 55 of the air inlet section 50 contracts, and the sliding arm 51 and the suction section 52 move backward.

[0149] The airflow AR flowing into the suction section 52 flows rearward through the suction pipe 53 and exits downward from the pipe outlet 54A. The airflow AR exiting downward from the pipe outlet 54A flows into the rear outer cylinder 62 of the cyclone outer cylinder 61 from the cyclone inlet 64. Furthermore, the airflow AR flowing into the rear outer cylinder 62 flows forward while rotating around the cyclone axis 61A along the inner circumferential surface of the rear outer cylinder 62, and exits from the front end of the rear outer cylinder 62 into the interior of the front outer cylinder 63. The airflow AR exiting into the interior of the front outer cylinder 63 flows forward while rotating around the cyclone axis 61A along the inner circumferential surface of the front outer cylinder 63 (see reference). Figure 6 and Figure 7 The airflow AR. Thus, within the cyclone chamber 60A, air and dust are separated, and the separated dust falls from the front opening of the outer cylinder 63 onto the lower surface of the dust collection chamber 60B. Furthermore, the airflow AR, now free of dust, flows rearward through approximately the center of the outer cyclone cylinder 61 and into the inner cyclone exhaust cylinder 65 (see reference). Figure 7 The airflow AR flows into the cyclone exhaust cylinder 65 and then flows into the filter chamber 71 of the filter section 70 from the cyclone outlet hole 66.

[0150] The airflow AR flowing into the filter chamber 71 flows toward the outlet 74 of the dust collection device 40. That is, within the filter chamber 71, the airflow AR flows upward and passes through the filter 72, flowing toward the discharge section 73 (see reference). Figure 2 The dust in the airflow AR is removed by the filter 72, and the dust-free airflow AR flows from the outlet 74 of the filter section 70 into the main body housing section 13.

[0151] The airflow AR flowing into the main body housing 13 enters the second fan section 23B from the fan intake 27A of the fan 23. Furthermore, through the second fins 26, the airflow AR flows radially outward from the fan 23 and is discharged from the second exhaust port 13D. In this way, the dust collection device 40 can draw in the air surrounding the tip tool T, separate the dust contained in the air, and collect the separated dust.

[0152] Here, the dust collection device 40 is configured to include an air intake pipe 53 connected to the suction unit 52, a cyclone section 60 that centrifuges the dust by rotating the air flowing out of the air intake pipe 53, and a filter section 70 that houses the filter 72. The filter section 70 is connected to the cyclone section 60 and has an outlet 74 for discharging the air that has passed through the filter 72. Therefore, the air surrounding the tip tool T can be separated from the dust in the cyclone section 60. Moreover, even if dust remains in the air after passing through the cyclone section 60, the remaining dust can be removed by the air passing through the filter 72 in the filter chamber 71. Therefore, the dust collection performance of the dust collection device 40 can be improved.

[0153] Furthermore, the suction pipe 53 and the cyclone section 60 are arranged in a position that overlaps in the front-to-back direction, and the filter section 70 is arranged on the rear side of the cyclone section 60 (on one side in the front-to-back direction). Therefore, compared with, for example, the filter section 70 being arranged on the lower side of the cyclone section 60, it is possible to suppress the increase in the size of the dust collection device 40 in the vertical direction.

[0154] Furthermore, the suction pipe 53 is positioned further forward (on the other side in the front-to-back direction) than the filter section 70. That is, the suction pipe 53 and the cyclone section 60 are arranged along the front-to-back direction with the filter section 70. As a result, compared to, for example, the filter section 70 is positioned below the suction pipe 53 and the cyclone section 60, the size of the dust collection device 40 in the vertical direction can be further reduced.

[0155] Furthermore, the cyclone section 60 is configured to include a cyclone outer cylinder 61 centered on a cyclone shaft 61A with the back-to-back direction as the axis, a cyclone inlet section 64 connecting the suction pipe 53 and the cyclone outer cylinder 61, and a cyclone outlet hole 66 connecting the cyclone outer cylinder 61 and the filter section 70. That is, the axial direction of the cyclone outer cylinder 61 is consistent with the arrangement direction of the cyclone section 60 and the filter section 70. Therefore, compared with, for example, the case where the axial direction of the cyclone outer cylinder 61 is the vertical direction, it is possible to suppress the large size of the dust collection device 40 in the vertical direction.

[0156] Furthermore, the cyclone inlet 64 has a guide surface 64B, which, when viewed from the front, extends tangentially from the inner circumference of the cyclone outer cylinder 61 (rear outer cylinder 62). Consequently, the airflow AR flowing into the cyclone outer cylinder 61 flows along the inner circumferential surface of the cyclone outer cylinder 61 (rear outer cylinder 62) and rotates around the cyclone axis 61A. Therefore, air and dust within the airflow AR can be effectively separated within the cyclone outer cylinder 61.

[0157] Furthermore, the cyclone section 60 has a pair of cyclone outer cylinders 61, a cyclone inlet section 64, and a cyclone outlet hole 66. Thus, compared with a single cyclone section, the cyclone outer cylinders 61, the cyclone inlet section 64, and the cyclone outlet hole 66 can effectively separate dust from air in the airflow AR.

[0158] Furthermore, in the left-right direction, the center of the suction pipe 53 is positioned between the cyclone axes 61A of the pair of left and right cyclone outer cylinders 61. That is, in a forward view, the suction pipe 53 is positioned between the pair of left and right cyclone outer cylinders 61. Therefore, it is possible to suppress the enlargement of the dust collection device 40 in the left-right direction.

[0159] Furthermore, the cyclone outer cylinder 61 is constructed by including a rear outer cylinder 62 constituting the rear portion of the cyclone outer cylinder 61 and a front outer cylinder 63 constituting the front portion of the cyclone outer cylinder 61. The inner diameter of the rear outer cylinder 62 is fixed. On the other hand, the inner diameter of the rear end portion of the front outer cylinder 63 is set to be larger than the inner diameter of the front end portion of the front outer cylinder 63, and is also set to be larger than the inner diameter of the rear outer cylinder 62. The front end portion of the rear outer cylinder 62 is disposed inside the rear end portion of the front outer cylinder 63, forming a gap G1 between the front end portion of the rear outer cylinder 62 and the rear end portion of the front outer cylinder 63. Therefore, even if the posture of the dust collection device 40 changes during operation, the dust separated inside the cyclone outer cylinder 61 can be stored in the dust collection chamber 60B.

[0160] That is, during the use of the hammer drill 10, there are instances where the hammer drill 10 is used in a posture where the tip of the top tool T faces upwards. In this case, the cyclone shaft 61A is arranged in the vertical direction, and the front outer cylinder 63 is arranged above the rear outer cylinder 62. Therefore, the dust separated inside the cyclone outer cylinder 61 flows upwards along the inner circumferential surface of the cyclone outer cylinder 61 along with the airflow AR, but there is a possibility that the dust will not be discharged upwards from the top opening of the front outer cylinder 63 (cyclone outer cylinder 61). At this time, the dust that is not discharged from the top opening of the front outer cylinder 63 falls downwards along the inner circumferential surface of the front outer cylinder 63 and falls from the gap G1 towards the dust collection chamber 60B. As a result, the dust that is not discharged from the top opening of the front outer cylinder 63 can be stored in the dust collection chamber 60B. Therefore, even if the posture of the dust collection device 40 changes during operation, the dust separated inside the cyclone outer cylinder 61 can be stored in the dust collection chamber 60B.

[0161] Furthermore, in the filter section 70, the lower end of the cyclone outlet hole 66 is disposed on the lower side of the filter 72, and the outlet 74 is disposed on the upper side of the filter 72. Thus, dust can be removed from the airflow AR flowing from the cyclone section 60 to the filter section 70 by the filter 72, and the dust-removed airflow AR flows towards the hammer drill 10 side. Furthermore, the filter 72 is formed into a pleated shape folded in the front-to-back direction. This prevents the filter section 70 from becoming too large and allows for a larger area of ​​the filter 72. In other words, it prevents the filter section 70 from becoming too large and improves the dust removal performance of the filter 72.

[0162] Furthermore, in a forward view, the upper part of the cyclone outlet hole 66 coincides with the lower end of the filter 72, and the lower end of the cyclone outlet hole 66 is positioned below the filter 72. Therefore, compared to a structure where the entire cyclone outlet hole 66 is positioned below the filter 72, the vertical position of the cyclone outer cylinder 61 can be set to the upper side. This allows it to be positioned close to the cyclone outer cylinder 61 relative to the intake pipe 53. In other words, the vertical lengths of the pipe outlet portion 54A and the cyclone inlet portion 64 can be relatively short. Therefore, the airflow AR flowing from the intake pipe 53 into the cyclone outer cylinder 61 can rotate well along the inner circumferential surface of the cyclone outer cylinder 61, separating air and dust within the cyclone chamber 60A.

[0163] Furthermore, when viewed from the front, the filter section 70 overlaps with the cyclone section 60 and the suction pipe 53. As a result, the size of the dust collection device 40 in both the left-right and up-down directions can be suppressed.

[0164] Furthermore, the housing 12 of the hammer drill 10 is composed of a main housing portion 13 extending in the front-rear direction and a handle housing portion 14 extending downward from the rear end of the main housing portion 13. In the front-rear direction, the filter portion 70 of the dust collection device 40 is disposed between the handle portion 14A and the cyclone portion 60 of the handle housing portion 14. Thus, relative to the main housing portion 13, the cyclone portion 60 and the filter portion 70 of the dust collection device 40 can be disposed on the extending direction side of the handle housing portion 14, and the handle portion 14A, the filter portion 70, and the cyclone portion 60 are arranged along the extending direction of the main housing portion 13. Therefore, it is possible to suppress the increase in the vertical size of the dust collection device 40 when it is installed in the hammer drill 10.

[0165] Furthermore, in the front-to-back direction, the fan 23 of the hammer drill 10, the second drill bit side air intake 13B, and the filter section 70 of the dust collection device 40 are arranged in overlapping positions. Specifically, the second drill bit side air intake 13B and the filter section 70 are arranged below the second fan section 23B of the fan 23. Therefore, the passage through which the airflow AR flows can extend in the vertical direction between the filter section 70 and the second fan section 23B. That is, the length of the passage through which the airflow AR flows can be shortened. As a result, the air resistance to the airflow AR can be reduced. Therefore, the airflow AR can flow efficiently from the filter section 70 to the hammer drill 10 side and be discharged from the second exhaust port 13D.

[0166] Furthermore, in this embodiment, when viewed in a side cross-section, the inner circumferential surface of the front outer cylinder 63 in the cyclone section 60 is inclined in a straight line towards the cyclone axis 61A as it faces forward. In other words, the inner circumferential surface of the front outer cylinder 63 is composed of a single inclined surface. Alternatively, the inner circumferential surface of the front outer cylinder 63 may be composed of multiple inclined surfaces. Moreover, when viewed in a side cross-section, the inner circumferential surface of the front outer cylinder 63 can be bent into an arc shape.

[0167] Furthermore, in this embodiment, the lower end of the cyclone outlet hole 66 is disposed on the lower side relative to the filter 72, or the entire cyclone outlet hole 66 may be disposed on the lower side relative to the filter 72.

[0168] Hereinafter, the hammer drill system S of the working machinery system as a second embodiment will be described using the accompanying drawings. The following description of the second embodiment mainly addresses matters not mentioned in the first embodiment. Except for some repetitions of the description of the first embodiment, the construction that does not specifically differ from the first embodiment is common to the first embodiment. For example... Figure 9 As shown, the hammer drill system S comprises a hammer drill 10 as the working machine and a dust collection device 40 as an auxiliary device. The dust collection device 40 is installed on the hammer drill 10 and draws in air from the area surrounding the tool T mounted at the top of the hammer drill 10. Thus, the dust generated during the operation of the hammer drill 10 is stored in the dust collection device 40.

[0169] (Regarding the hammer drill 10) The hammer drill 10 is configured as a tool for piercing or similar operations on workpieces. For example... Figure 9 and Figure 10 As shown, the hammer drill 10 comprises a housing 12, a motor 20, a drive mechanism 30 driven by the driving force of the motor 20, and a battery pack 34. The structure of the hammer drill 10 will be described below.

[0170] (Regarding housing 12) In a side view viewed from the left, housing 12 is formed into a hollow, generally inverted L-shaped form. Specifically, housing 12 is composed of a main body housing 13 extending in the front-rear direction and a handle housing portion 14 extending downward from the rear end of the main body housing 13.

[0171] Multiple (four in the second embodiment) rear air intake ports 13A are formed through the left and right side walls of the rear end portion of the main body housing 13. The rear air intake ports 13A are elongated holes extending along the longitudinal direction and are arranged vertically. Furthermore, a front air intake port 13B (see reference) is formed through the lower wall of the middle portion of the main body housing 13 in the longitudinal direction, serving as an air intake port. Figure 10 The front intake port 13B is roughly rectangular in shape.

[0172] Furthermore, multiple (four in the second embodiment) first exhaust ports 13C are formed through the right wall of the middle part of the main body shell 13 in the front-rear direction (see reference). Figure 10 )(exist Figure 10 For convenience, only the first exhaust port 13C located at the top is indicated by a symbol. The first exhaust port 13C is formed as an elongated hole with the vertical direction as its length, and is arranged along the vertical direction. Furthermore, in the main body housing 13, a plurality of second exhaust ports 13D (four in the second embodiment) are formed through the front side of the first exhaust port 13C as exhaust ports (see reference). Figure 10 )(exist Figure 10 For convenience, only the second exhaust port 13D located at the top is indicated by a symbol. The second exhaust port 13D is formed as an elongated hole with the vertical direction as its length, and is arranged along the vertical direction. Furthermore, the second exhaust port 13D is located slightly behind the front intake port 13B.

[0173] At the lower ends of the left and right side walls of the main body housing 13, a locking recess 13E is formed on the rear side of the front air intake 13B to lock the adapter 41 described below (see reference). Figure 19 The locking recess 13E is formed as a concave shape that extends along the front-back direction and opens outward in the left-right direction.

[0174] Also Figure 12 As shown, a support portion 13F for supporting the adapter 41 described below is formed on the lower wall of the main body housing 13, in front of the front air intake 13B. The support portion 13F protrudes downward from the main body housing 13 and extends in the left-right direction. A support hole 13G is formed in the support portion 13F, and the support hole 13G extends through in the left-right direction.

[0175] The upper part of the handle housing 14 is configured as a handle 14A for the user to grip. A trigger 15 is provided at the upper end of the handle 14A. The trigger 15 protrudes forward from the handle 14A and is configured to be operated by flicking backward. A switch mechanism 16 is provided behind the trigger 15. The switch mechanism 16 has a switch (not shown) operated by the trigger 15. The switch is electrically connected to the control unit of the hammer drill (not shown) and is configured to output an output signal corresponding to the operating state of the trigger 15 to the control unit.

[0176] The lower end of the handle housing portion 14 is configured as a battery mounting portion 14B for mounting the battery pack 34 described below. The battery mounting portion 14B protrudes forward from the lower end of the handle housing portion 14 and bends downward. Furthermore, a connector 17 for connecting to the battery pack 34 is provided in the battery mounting portion 14B.

[0177] (Regarding motor 20) as follows Figure 10 As shown, the motor 20 is configured as a three-phase brushless motor, housed within the rear portion of the main body housing 13, and electrically connected to the control unit. The motor 20 has a drive shaft 21 with the rear-to-rear direction as its axial direction. The front end portion of the drive shaft 21 is rotatably supported by a front bearing 18 fixed to the main body housing 13, and the rear end portion of the drive shaft 21 is rotatably supported by a rear bearing 19 fixed to the main body housing 13. Furthermore, a pinion 21A is formed at the front end portion of the drive shaft 21.

[0178] like Figure 10 , Figure 3 (A) and Figure 3 (B) and Figure 4 As shown, a fan 23 is integrally rotatable on the front end of the drive shaft 21. The fan 23 is formed as a disc with its thickness along the rear-to-rear direction. The fan 23 is composed of a first fan section 23A constituting the rear of the fan 23 and a second fan section 23B constituting the front of the fan 23, and the first fan section 23A and the second fan section 23B are configured as centrifugal fans.

[0179] The first fan section 23A comprises a base plate 24 and a plurality of first fins 25. The base plate 24 is formed in a generally annular shape with the thickness direction in the rear-to-rear direction. The first fins 25 are formed on the rear surface of the base plate 24 and extend radially along the base plate 24. Moreover, the plurality of first fins 25 are arranged at predetermined angles in the circumferential direction of the base plate 24. Furthermore, the first exhaust port 13C of the housing 12 is arranged radially outward of the fan 23 relative to the first fins 25. And its structure is such that if the fan 23 rotates together with the drive shaft 21, an airflow is generated by the first fins 25 flowing radially outward of the fan 23. Thus, its structure allows air to flow into the main housing 13 from the rear intake port 13A through the first fan section 23A and to flow out from the first exhaust port 13C, thereby cooling the motor 20.

[0180] The second fan section 23B comprises a base plate 24, a plurality of second fins 26, and a fan shroud 27. Specifically, the base plate 24 serves as a common portion of the first fan section 23A and the second fan section 23B. The second fins 26 are formed on the front surface of the base plate 24 and extend radially along the base plate 24. Furthermore, the plurality of second fins 26 are arranged at predetermined angles along the circumference of the base plate 24. Additionally, the second exhaust port 13D of the housing 12 is arranged radially outward of the fan 23 relative to the second fins 26.

[0181] The fan shroud 27 is formed in the shape of a generally circular plate and is connected to the front end of the second fin 26. Viewed from the side, the fan shroud 27 is slightly inclined towards the front as it moves radially inward. Furthermore, the central opening of the fan shroud 27 is configured as a fan intake port 27A, and the inner diameter of the fan intake port 27A is set to be larger than the diameter of the drive shaft 21. Moreover, the front end of the fan shroud 27 is positioned above the front intake port 13B of the housing 12.

[0182] Furthermore, it is configured such that when the fan 23 rotates together with the drive shaft 21, air flows into the interior of the second fan section 23B from the fan intake 27A, and flows radially outward of the fan 23 through the second fins 26. Thus, an airflow AR is generated by the second fan section 23B, flowing into the main housing 13 from the front intake 13B. The airflow AR then passes through the interior of the second fan section 23B and is discharged from the second exhaust port 13D.

[0183] (Regarding the drive mechanism section 30) as follows Figure 10 As shown, the drive mechanism 30 is configured to transmit the rotational force of the motor 20 to the tip tool T, thereby driving the tip tool T. The drive mechanism 30 is housed within the front end of the main body housing 13. More specifically, the drive mechanism 30 is disposed on the front side of the fan 23. The drive mechanism 30 includes an intermediate shaft 31 and a transmission part 32.

[0184] The intermediate shaft 31 is formed into a generally cylindrical shape with the back-to-back direction as its axial direction, and is rotatably supported by a bearing (not shown) fixed to the main housing 13. A gear (not shown) is integrally rotatable at the rear end of the intermediate shaft 31, and this gear meshes with a pinion 21A on the drive shaft 21. Thus, the motor 20 drives the shaft 21 to rotate, resulting in a structure where the intermediate shaft 31 rotates about its own axis. A motion conversion member (not shown) is provided on the intermediate shaft 31, which converts the rotational motion of the intermediate shaft 31 into a reciprocating motion in the back-to-back direction and transmits it to the transmission part 32 described below.

[0185] The transmission section 32 extends along the front-rear direction on the upper side of the intermediate shaft 31. A tip tool T is mounted at the front end of the transmission section 32. The tip tool T is formed as a generally cylindrical shape with the front-rear direction as its axial direction, and its rear end is mounted on the transmission section 32. The transmission section 32 is connected to the intermediate shaft 31. Thus, the rotational force of the motor 20 is transmitted to the tip tool T, which rotates around its own axis, thereby performing piercing processing on the workpiece.

[0186] (Regarding battery pack 34) as follows Figure 9 and Figure 10As shown, the battery pack 34 is formed in a generally rectangular shape. Furthermore, the battery pack 34 is mounted from the rear to the battery mounting portion 14B of the handle housing portion 14. The battery pack 34 has a connector (not shown), which is connected to the connector 17, supplying power from the battery pack 34 to the motor 20. Moreover, the battery pack 34 has a pair of engaging members 34A, which are provided on the left and right sides of the battery pack 34. The engaging members 34A engage with the handle housing portion 14, restricting the rearward movement of the battery pack 34.

[0187] (Regarding dust collection device 40) such as Figure 9 As shown, the dust collection device 40 comprises a dust collection device body 150 as the main body and an adapter 41 for connecting the dust collection device body 150 and the hammer drill 10. Furthermore, as will be described in detail below, the interior of the dust collection device body 150 is connected to the interior of the main body housing 13 via a front air intake 13B. Airflow AR generated by the second fan section 23B of the fan 23 causes air from inside the dust collection device body 150 to flow into the main body housing 13 through the front air intake 13B. More specifically, the air and dust surrounding the tip tool T are drawn into the dust collection device body 150 by the airflow AR. Inside the dust collection device body 150, the drawn air and dust are separated, and the separated air flows out of the front air intake 13B into the main body housing 13. Hereinafter, the adapter 41 will be described first, followed by the dust collection device body 150.

[0188] (Regarding adapter 41) as follows Figure 10 , Figure 12 As shown, the adapter 41 is detachably mounted to the main housing 13 of the hammer drill 10, and is configured as a connecting member for connecting the dust collection device body 150 (described below) to the hammer drill 10. The adapter 41 comprises an adapter body 142 and a pair of left and right adapter locking members 49.

[0189] like Figures 13-16 As shown, the adapter body 142 is formed into a generally rectangular plate with its thickness along the vertical direction and its length along the rearward direction. A shaft fixing portion 142A protruding upward is provided on the left side of the front end of the adapter body 142. A support shaft 143 is provided on the shaft fixing portion 142A. The support shaft 143 is formed into a generally cylindrical shape with its axial direction along the left-right direction and extends to the right from the shaft fixing portion 142A. Thus, the support shaft 143 is separated from the upper side of the front end of the adapter body 142. Furthermore, when the adapter 41 is installed in the hammer drill 10, the support shaft 143 is inserted into the support hole 13G of the hammer drill 10 from the left, and the front end of the adapter 41 is supported by the hammer drill 10.

[0190] A mounting recess 142B is formed on the lower surface of the adapter body 142 for mounting the mounting portion 82 of the dust collection device body 150 described below. The mounting recess 142B is formed in a concave shape that is open to the lower side and the front side, and is generally rectangular when viewed from the lower side. A track groove 142C that opens to the inside of the mounting recess 142B is formed on the upper part of the inner peripheral surface of the mounting recess 142B. The track groove 142C extends along the circumferential direction of the mounting recess 142B, and both ends of the track groove 142C open to the front side in the longitudinal direction. That is, the track groove 142C is composed of a pair of side track grooves 142C1 formed on the left and right inner peripheral surfaces of the mounting recess 142B as engaging portions, and a rear track groove 142C2 formed on the rear surface of the mounting recess 142B. Furthermore, the rear end of the side track groove 142C1 (one end in the front-to-back direction) is connected to both ends of the rear track groove 142C2 in the left-to-right direction, and the front end of the side track groove 142C1 (the other end in the front-to-back direction) opens to the front. Moreover, the width (vertical dimension) of the side track groove 142C1 is formed such that it decreases towards the rear (see reference). Figure 15 That is, the top surface of the mounting recess 142B slopes downward as it faces the rear.

[0191] An adapter connection portion 142D is formed at the midpoint of the adapter body 142 in the front-rear direction. The adapter connection portion 142D is formed into a generally rectangular cylindrical shape with the vertical direction as the axial direction and the horizontal direction as the length direction. The adapter connection portion 142D extends through the adapter body in the vertical direction and communicates with the rear end of the mounting recess 142B. Furthermore, the upper end of the adapter connection portion 142D protrudes upward relative to the adapter body 142. Moreover, when the adapter 41 is installed on the hammer drill 10, the upper end of the adapter connection portion 142D is embedded in the front air intake 13B of the hammer drill 10 (see reference). Figure 11 ).

[0192] A pair of left and right recesses 142E are formed on the side of the rear end portion of the adapter body 142 for accommodating the adapter locking member 49 described below (see reference). Figure 14 The recess 142E is formed as a concave shape that opens outward in the left and right direction and extends through in the up and down direction.

[0193] A spacer receiving portion 142F is formed on the upper surface of the adapter body 142. The spacer receiving portion 142F is formed as a concave shape that opens upwards, and is generally T-shaped when viewed from above. Furthermore, the adapter connecting portion 142D is disposed within the rear portion of the spacer receiving portion 142F. Moreover, a pair of left and right dividing ribs 142G extending in the left-right direction are formed inside the spacer receiving portion 142F (see reference). Figure 13The dividing ribs 142G extend inward from the left and right sides of the spacer housing 142F. Thus, the front and rear portions of the spacer housing 142F are divided by the dividing ribs 142G.

[0194] A front spacer 144, which serves as a spacer, is provided at the front end of the spacer receiving portion 142F in a detachable manner. The front spacer 144 is formed into a generally rectangular plate with the thickness direction in the vertical direction, and contains an elastic material such as rubber. Furthermore, the front spacer 144 is configured to be inserted into the front air intake 13B of the hammer drill 10. That is, in the case where the hammer drill 10 is used alone, the front spacer 144 is inserted into the front air intake 13B and functions as a cover to block the opening of the front air intake 13B. On the other hand, in the case where the dust collection device 40 is installed on the hammer drill 10, the structure is as follows: the front spacer 144 is detached from the front air intake 13B and installed in the spacer receiving portion 142F of the adapter 41.

[0195] A rear spacer 145 is provided at the rear of the spacer housing 142F. The rear spacer 145 is formed into a generally T-shaped plate with the thickness direction in the vertical direction, and contains an elastic material such as rubber. Furthermore, when the adapter 41 is installed on the hammer drill 10, it forms a structure in which the lower wall of the main body housing 13 abuts against the upper surfaces of the front spacer 144 and the rear spacer 145 (see reference). Figure 11 Additionally, a insertion portion 45A is formed through the rear spacer 145 for the adapter connection portion 142D to be inserted.

[0196] At the rear end of the lower surface of the adapter body 142, a downwardly opening spring receiving portion 142H is formed between a pair of configuration recesses 142E (see reference). Figure 16 The spring receiving portion 142H extends in the left-right direction. Furthermore, a cover member 46 is provided at the rear end of the adapter body 142, blocking the opening of the spring receiving portion 142H. A locking recess 46A is formed at the center of the front end of the cover member 46 in the left-right direction. The locking recess 46A is formed as a concave shape that protrudes upwards and opens to the front and lower sides.

[0197] Furthermore, a locking groove is formed on the lower surface of the adapter body 142 between the mounting recess 142B and the cover member 46 (see reference). Figure 14 The mounting recess 142B and the locking recess 46A are connected in the front-rear direction via the locking groove 142J. Furthermore, a locking hook portion 42K is formed on the right side of the locking groove 142J, extending towards the center of the adapter body 142 in the width direction (see reference). Figure 14 ).

[0198] Moreover, such as Figure 16As shown, a base plate 47 is provided above the locking recess 46A of the cover member 46 within the spring receiving portion 142H. The base plate 47 is formed as a generally elongated strip with its thickness in the vertical direction and its length in the horizontal direction. Furthermore, the central portion of the base plate 47 in the horizontal direction protrudes upward and is disposed adjacent to the upper side of the locking recess 46A. A pair of force-applying springs 48 are provided within the spring receiving portion 142H. The force-applying springs 48 are configured as compression disc springs and are disposed between the two ends of the base plate 47 in the horizontal direction and the top surface of the spring receiving portion 142H. Thus, the base plate 47 is pushed downward by the force-applying springs 48.

[0199] like Figures 13-16 As shown, the adapter locking member 49 is generally formed as a T-shaped plate with its thickness along the left-right direction. The lower end of the adapter locking member 49 is disposed within the placement recess 142E of the adapter body 142 and is rotatably connected to the adapter body 142 via a pin P with the front-rear direction as the axial direction. Furthermore, with the adapter locking member 49 connected to the adapter body 142, the upper end of the adapter locking member 49 protrudes upwards relative to the adapter body 142. Specifically, the left and right pairs of adapter locking members 49 are arranged facing each other along the left-right direction. Figure 16 The state indicated by the solid line in the middle is referred to below as the stuck state.

[0200] A protrusion 49A protruding inward in the left-right direction is formed at the lower end of the adapter locking member 49 (see reference). Figure 16 The protruding piece 49A is disposed within the spring receiving portion 142H of the adapter body 142 and between the cover member 46 and the base plate 47. Thus, the adapter locking member 49 is held in a locked state by the force applied by the force-applying spring 48. Furthermore, the rotation of the adapter locking member 49 to one side of the rotational direction (the direction in which the upper ends of the pair of adapter locking members 49 approach each other) is restricted by the cover member 46. On the other hand, through the operator's operation, the adapter locking member 49 resists the force applied by the force-applying spring 48 and rotates to the other side of the rotational direction (…). Figure 16 Rotate in the direction of arrow A, thereby separating the upper ends of the pair of adapter locking members 49 from each other (for...). Figure 16 The state indicated by the double-dotted line is referred to below as the locking / unlocking state. That is, the adapter locking member 49 is configured to be able to switch between the locking state and the locking / unlocking state.

[0201] A locking hook 49B is formed at the upper end of the adapter locking member 49. The locking hook 49B protrudes inward in the left-right direction of the adapter 41 and extends in the front-back direction. Furthermore, when the adapter 41 is installed in the main body housing 13, the locking hook 49B of the adapter locking member 49 in the locked state is inserted into the locking recess 13E of the main body housing 13, and the adapter locking member 49 is locked in place by the main body housing 13 (see reference). Figure 9 and Figure 20 ).

[0202] A locking operation portion 49C is formed at the lower end of the adapter locking member 49. The locking operation portion 49C is configured to be held by the operator during switching operations. The locking operation portion 49C protrudes outward in the left-right direction of the adapter 41, and the top end of the locking operation portion 49C is bent downward. Furthermore, when the dust collection device body 150 is installed on the adapter 41 as described below, the step portion 151C of the dust collection device body 150 forms a structure adjacent to the lower side of the locking operation portion 49C and between the top ends of a pair of locking operation portions 49C (see reference). Figure 16 Therefore, the top end of the locking operation part 49C abuts against the dust collection device body 150, and the rotation of the adapter locking member 49 to the other side of the rotation direction is restricted. That is, the switching from the locking state to the unlocked state of the adapter locking member 49 is prevented.

[0203] (Regarding the dust collection device body 150) as follows Figures 9-12 , Figure 17 ,and Figure 18 As shown, the dust collection device body 150 extends entirely in the front-to-back direction and is disposed adjacent to the lower side of the body housing 13. The dust collection device body 150 is composed of a dust collection housing 151, an air inlet 152, and a dust collection part 58. Furthermore, the dust collection device body 150 has a mounting part 82 for mounting the dust collection device body 150 to the adapter 41 and a locking member 86. The structure of the dust collection device body 150 will be described below.

[0204] (Regarding the dust collection housing 151) The dust collection housing 151 forms the upper outline of the dust collection device body 150. The dust collection housing 151 is formed in a generally box-shaped manner that opens to the lower side. The dust collection housing 151 includes housing members divided into two parts in the left-right direction, and the dust collection housing 151 is formed by assembling the divided housing members. A cylindrical support cylinder 151A with the rear-to-rear axial direction is formed at the front part of the dust collection housing 151, and the support cylinder 151A is disposed at the front side of the hammer drill 10, which is further forward than the body housing 13. A connecting part 151B for connecting the divided housing members to each other is formed at the rear end of the support cylinder 151A (see reference). Figure 10 and Figure 11The connecting part 151B is formed into a generally cylindrical shape with the left and right directions as the axis.

[0205] Furthermore, a step portion 151C that descends one step downwards is formed at the upper rear end of the dust collection housing 151 (see reference). Figure 9 and Figure 18 Furthermore, with the dust collection device body 150 installed on the adapter 41, the adapter 41 is disposed within the step portion 151C. A first exposure hole 151D is formed through the step portion 151C to expose the mounting portion 82 described below (see reference). Figure 11 and Figure 18 The first exposed hole 151D is roughly rectangular in shape when viewed from above. The edge of the first exposed hole 151D is formed with a step shape that decreases one level downwards (see reference). Figure 11 Furthermore, a second exposure hole 151E is formed through the rear side of the first exposure hole 151D of the step portion 151C to expose the locking member 86 described below (see reference). Figure 11 and Figure 18 The second exposed hole 151E is roughly rectangular in shape when viewed from above, and is connected to the first exposed hole 151D.

[0206] (Regarding the air inlet section 152) as follows Figure 10 As shown, the air inlet 152 is configured to allow air to flow in from around the tip tool T and to allow the air to flow out to the dust collection section 58 described below. The air inlet 152 forms the upper part of the front side of the dust collection device body 150. The air inlet 152 is configured to include a sliding arm 153, a suction section 154, and a suction pipe 155.

[0207] The sliding arm 153 is formed into a cylindrical shape with the front-to-back direction as the axis. The sliding arm 153 is connected to the support cylinder portion 151A of the dust collection housing 151 in a manner that allows it to slide along the front-to-back direction, and the front end of the sliding arm 153 protrudes further forward than the support cylinder portion 151A.

[0208] The suction section 154 is formed into a cylindrical shape with the vertical direction as the axis, and the lower end of the suction section 154 is connected to the front end of the slide arm 153. A rearwardly curved connecting cylinder section 154A is formed at the lower end of the suction section 154, and the connecting cylinder section 154A is disposed inside the front end of the slide arm 153.

[0209] The upper opening of the suction section 154 is configured as a suction port 154B. Furthermore, a tool insertion section 54C is formed at the upper end of the suction section 154. The tool insertion section 54C is formed in a generally cylindrical shape with the rear-to-rear direction as the axial direction, and the suction port 154B opens radially inward into the tool insertion section 54C. With the dust collection device body 150 mounted on the hammer drill 10, the tip of the tip tool T is inserted into the tool insertion section 54C. Thus, air surrounding the tip tool T flows into the suction section 154 through the suction port 154B.

[0210] The suction pipe 155 comprises a rear suction pipe 56 constituting the rear portion of the suction pipe 155 and a front suction pipe 57 constituting the front portion of the suction pipe 155. The rear suction pipe 56 is formed into a generally cylindrical shape with the rear-to-rear direction as the axial direction. The rear suction pipe 56 is housed within the support cylinder portion 151A of the dust collection housing 151 and is fixed to the dust collection housing 151. A downwardly protruding pipe outlet portion 56A is formed at the rear end of the rear suction pipe 56. The pipe outlet portion 56A is formed into a generally rectangular cylinder shape, and the interior of the rear suction pipe 56 communicates with the interior of the pipe outlet portion 56A. In addition, the rear suction pipe 56 is formed on the mounting member 80 having the mounting portion 82 described below, constituting the front portion of the mounting member 80 (see reference). Figure 11 ).

[0211] The front intake pipe 57 is formed into a generally cylindrical shape with the rear-to-rear direction as its axial direction. The front intake pipe 57 is coaxially positioned with the rear intake pipe 56 on its front side, and the rear end of the front intake pipe 57 is inserted externally into the front end of the rear intake pipe 56. The front intake pipe 57 is formed of a stretchable rubber material or the like, and is configured to extend and retract in the rear-to-rear direction. Therefore, the intake pipe 155, including the front intake pipe 57, is configured to extend and retract in the rear-to-rear direction. The front end of the front intake pipe 57 is inserted externally into the connecting sleeve portion 154A of the suction section 154. This results in a structure where air drawn into the suction section 154 from the suction port 154B flows rearward through the intake pipe 155 and exits downward from the pipe outlet portion 56A.

[0212] (Regarding Dust Collection Department 58) as follows Figures 10-12 , Figure 17 ,and Figure 18As shown, the dust collection unit 58 is formed in a generally rectangular box shape and is detachably mounted to the dust collection housing 151 below the rear suction pipe 56. That is, the dust collection unit 58 is located behind the suction port 154B. The dust collection unit 58 has a cyclone section 60 as an auxiliary mechanism section constituting the front of the dust collection unit 58 and a filter section 70 constituting the rear end side of the dust collection unit 58. Furthermore, the dust collection unit 58 has a first box body 58A, which forms the outer wall of the dust collection chamber constituting the outer contour of the cyclone section 60, and a second box body 58B, which forms the outer contour of the filter section 70. The first box body 58A and the second box body 58B are assembled together. The first box body 58A is formed into a cylindrical shape that extends through the front-rear direction, and the second box body 58B is formed into a generally box shape that opens to the upper side. Furthermore, the rear opening of the first box body 58A is blocked by the second box body 58B. Thus, the front wall of the second housing 58B is configured as a dividing wall 58C that separates the cyclone section 60 from the filter section 70.

[0213] Furthermore, a dust collection cover 59 is provided at the front end of the first housing 58A in an openable and closable manner. The dust collection cover 59 is formed into a generally rectangular plate with its thickness along the rear-to-rear direction. The lower end of the dust collection cover 59 is connected to the first housing 58A in a manner that allows it to rotate axially in the left-right direction, and the upper end of the dust collection cover 59 is engaged with the first housing 58A. Thus, the front opening of the first housing 58A is blocked by the dust collection cover 59. Moreover, a forward-opening locking groove 59A is formed at the upper end of the dust collection cover 59 (see reference). Figure 10 and Figure 11 Furthermore, with the dust collection unit 58 installed in the dust collection housing 151, the connecting portion 151B of the dust collection housing 151 is disposed in the locking groove 59A, and the front end of the dust collection unit 58 is locked in the connecting portion 151B. Thus, with the dust collection unit 58 installed in the dust collection housing 151, the dust collection cover 59 is kept in a blocked state.

[0214] (Regarding the cyclone section 60) The outer wall of the cyclone section 60 includes the first housing 58A described above. The cyclone section 60 has a pair of left and right cyclone outer cylinders 61, a pair of left and right cyclone inlets 64, and an exhaust inner cylinder 65 that serves as a pair of left and right inner cylinders.

[0215] (Regarding the cyclone outer cylinder 61) A pair of cyclone outer cylinders 61 are disposed inside the first housing 58A, and are positioned symmetrically about the center of the dust collection device body 150 in the left-right direction. The cyclone outer cylinder 61 is generally cylindrical in the front-back direction, with the central axis of the cyclone outer cylinder 61 serving as the cyclone axis 61A. Moreover, the cyclone outer cylinder 61 is composed of a rear outer cylinder 62, which is the first outer cylinder constituting the rear part of the cyclone outer cylinder 61, and a front outer cylinder 63, which is the second outer cylinder constituting the front part of the cyclone outer cylinder 61.

[0216] The rear outer cylinder 62 is formed as a cylinder centered on the cyclone axis 61A and protrudes forward from the partition wall 58C. In other words, the rear outer cylinder 62 is formed as a bottomed cylinder open to the front, and the rear end (axial end) of the rear outer cylinder 62 is blocked by the partition wall 58C. Moreover, the inner diameter of the rear outer cylinder 62 is fixed in the front-rear direction. That is, the inner circumferential surface of the rear outer cylinder 62 is arranged parallel to the cyclone axis 61A.

[0217] The front outer cylinder 63 is formed in a generally conical shape centered on the cyclone axis 61A and is positioned in front of the rear outer cylinder 62. Specifically, the inner circumferential surface of the front outer cylinder 63 slopes towards the cyclone axis 61A as it faces forward. In other words, the inner diameter of the rear end (one axial end) of the front outer cylinder 63 is set to be larger than the inner diameter of the front end (the other axial end) of the front outer cylinder 63. Moreover, the front outer cylinder 63 is integrally formed with the first housing 58A, and a portion of the front outer cylinder 63 forms part of the left and right sidewalls of the first housing 58A. The sidewalls of the front outer cylinder 63 slope radially inward as they face forward (the other axial side).

[0218] The inner diameter of the rear end of the front outer cylinder 63 is set to be larger than the inner diameter of the rear outer cylinder 62, and the front end of the rear outer cylinder 62 is disposed inside the rear end of the front outer cylinder 63. That is, in the front-rear direction, the front end of the rear outer cylinder 62 coincides with the rear end of the front outer cylinder 63, and an opening 61C is formed on the cyclone outer cylinder 61 between the front end of the rear outer cylinder 62 and the rear end of the front outer cylinder 63. Furthermore, the opening 61C opens to the rearward side in the entire circumferential direction of the front outer cylinder 63 and the rear outer cylinder 62. Moreover, the rear ends of the left and right front outer cylinders 63 are connected to each other at the central part in the left-right direction of the dust collection device body 150. Furthermore, the interior of the cyclone outer cylinder 61 is configured as a rotating chamber 61B, and the part of the interior of the first housing 58A other than the rotating chamber 61B is configured as a dust collection chamber 60B.

[0219] (Regarding the cyclone inlet 64) as follows Figure 12 and Figure 17 As shown, cyclone inlet portions 64 are respectively provided at the rear ends of a pair of left and right rear outer cylinders 62. The cyclone inlet portions 64 are formed into a generally rectangular cylindrical shape with the vertical direction as the axial direction, extending upwards from the rear outer cylinders 62 and adjacent to the lower side of the outlet portion 56A of the rear suction pipe 56. Specifically, the cyclone inlet portions 64 extend upwards from the inner side (central side of the dust collection device body 150 in the left-right direction) of the rear outer cylinders 62, and the interior of the rear outer cylinders 62 communicates with the interior of the cyclone inlet portions 64. That is, the cyclone inlet portions 64 are positioned relative to the cyclone axis 61A at a position biased towards the central side of the dust collection device body 150 in the left-right direction.

[0220] Furthermore, the inner sidewalls of the cyclone inlet 64 in the left-right direction are configured as guide walls 64A, and the inner circumferential surface of guide wall 64A is configured as guide surface 64B. In a forward view, guide surface 64B is inclined inward in the left-right direction as it faces upward, and its lower end connects to the inner circumferential surface of the rear outer cylinder 62. Specifically, in a forward view, guide surface 64B extends upward from its lower end along the tangential direction of the inner circumferential surface of the rear outer cylinder 62.

[0221] Furthermore, the interior of the cyclone inlet 64 is configured as a cyclone inlet hole 64C, allowing air flowing from the pipe outlet 56A into the cyclone inlet hole 64C to flow along the guide surface 64B into the rear outer cylinder 62. That is, the air flowing into the rear outer cylinder 62 is configured to circulate along the inner circumferential surface of the rear outer cylinder 62 while flowing forward. Moreover, the air flowing from the front end of the rear outer cylinder 62 into the interior of the front outer cylinder 63 is configured to circulate along the inner circumferential surface of the front outer cylinder 63 while flowing forward. Thus, within the rotary chamber 61B, air and dust are separated, and the dust is discharged from the front opening of the front outer cylinder 63 and accumulated on the lower surface of the dust collection chamber 60B. Additionally, the upper ends of the guide walls 64A at the left and right pair of cyclone inlets 64 are connected to each other.

[0222] (Regarding the exhaust inner cylinder 65) The exhaust inner cylinder 65 is respectively disposed inside a pair of rear outer cylinders 62. The exhaust inner cylinder 65 is formed into a cylindrical shape centered on the cyclone axis 61A, protruding forward from the partition wall 58C. Moreover, the exhaust inner cylinder 65 extends through in the front-rear direction. That is, a cyclone outlet hole 66 is formed at the rear end of the exhaust inner cylinder 65, penetrating the partition wall 58C, and the interior of the cyclone section 60 communicates with the interior of the filter section 70 described below through the cyclone outlet hole 66. Furthermore, it is structured such that the air with separated dust flows rearward through the central part of the cyclone outer cylinder 61, flows rearward through the exhaust inner cylinder 65, and flows out into the filter section 70 described below.

[0223] (Regarding filter section 70) as follows Figure 10 , Figure 11 , Figure 17 ,and Figure 18 As shown, the outer contour of the filter section 70 includes the second housing 58B described above. A dust collection locking member 168 is provided on the left side of the second housing 58B. The dust collection locking member 168 is formed into a generally rectangular plate with the left-right direction as the plate thickness direction. The lower end of the dust collection locking member 168 is connected to the second housing 58B in a manner that allows it to rotate axially in the front-back direction. Furthermore, when the dust collection section 58 is installed in the dust collection housing 151, the upper end of the dust collection locking member 168 engages with the inner side of the left wall of the dust collection housing 151.

[0224] The interior of the filter section 70 is configured as a filter chamber 71, and the exhaust inner cylinder 65 is connected to the filter chamber 71 through the cyclone outlet hole 66 described above. A filter 72 is provided in the middle of the upper part of the filter chamber 71 in the vertical direction. The filter 72 is formed into a sheet shape and folded into a pleated shape. Specifically, in side view, the filter 72 is folded into a pleated shape such that the upper end of the filter 72 is formed by the folds that form mountain pleats and the lower end of the filter 72 is formed by the folds that form valley pleats, and the pleats overlap in the front-to-back direction.

[0225] Furthermore, a dust collection and discharge section 73 is provided on the upper side of the second housing 58B. The dust collection and discharge section 73 is disposed on the rear side of the rear suction pipe 56 and is integrally formed with the rear suction pipe 56. The dust collection and discharge section 73 is formed into a generally rectangular cylindrical shape that extends through the vertical direction. More specifically, the dust collection and discharge section 73 is formed such that the cross-sectional area of ​​the dust collection and discharge section 73 decreases as it faces upward. Thus, the interior and exterior of the filter chamber 71 are connected through the dust collection and discharge section 73. Furthermore, the upper end of the dust collection and discharge section 73 is disposed inside the first exposure hole 151D of the dust collection housing 151 and protrudes upward from the step portion 151C of the dust collection housing 151 (see reference). Figure 18 ).

[0226] Furthermore, the upper opening of the dust collection discharge section 73 is configured as a dust collection discharge outlet 74, and the shape of the dust collection discharge outlet 74 is approximately the same as the internal shape of the adapter connection portion 142D of the adapter 41. Also, when the dust collection device 40 is installed on the hammer drill 10, the dust collection discharge section 73 is disposed adjacent to the lower side of the adapter connection portion 142D of the adapter 41 (see reference). Figure 11 Thus, the interior of the main body housing 13 is connected to the interior of the dust collection device main body 150 via the dust collection outlet 74 and the front air intake 13B. Therefore, air flowing into the filter chamber 71 from the cyclone section 60 flows upward and passes through the filter 72. Furthermore, the air passing through the filter 72 forms a structure that allows air to flow from the dust collection outlet 74 into the main body housing 13. Thus, the air passage section 90, which serves as a flow path for the air around the tip tool T to flow towards the main body housing 13 of the hammer drill 10, includes the air inlet section 152, the cyclone section 60, and the filter chamber 71.

[0227] (Regarding the installed part 82) as follows Figure 11 , Figure 12 ,and Figure 13As shown, the mounting portion 82 is provided at the upper end of the rear portion of the mounting member 80, which has the rear suction pipe 56 and the dust collection and discharge portion 73 described above. The mounting portion 82 is formed into a generally rectangular plate shape with the thickness direction in the vertical direction, and the rear portion of the mounting portion 82 is connected to the upper end of the dust collection and discharge portion 73. Furthermore, the mounting portion 82 is connected to the upper end of the dust collection and discharge portion 73 in such a way that both ends of the mounting portion 82 in the left and right directions protrude further outward in the left and right directions compared to the dust collection and discharge portion 73, and the rear end of the mounting portion 82 protrudes further rearward compared to the dust collection and discharge portion 73. Thus, the mounting portion 82 is positioned higher than the step portion 151C of the dust collection housing 151.

[0228] Furthermore, the left and right ends of the mounted portion 82 (specifically, the portions protruding further outward in the left and right directions compared to the dust discharge portion 73) are configured as side rails 82A serving as engaging portions. That is, the side rails 82A extend outward in the left and right directions along the front-back direction from the dust discharge outlet 74. Moreover, the width dimension (vertical dimension) of the side rails 82A corresponds to the side rail groove 142C1 of the adapter 41 and is set to decrease as it moves towards the rear. That is, the upper surface of the mounted portion 82 corresponds to the top surface of the mounting recess 142B of the adapter 41 and slopes downward as it moves towards the rear. Furthermore, when the dust collection device body 150 is mounted on the adapter 41, the side rails 82A are inserted into the side rail groove 142C1 of the adapter 41 in a manner that allows them to slide along the front-back direction and engage with the side rail groove 142C1 in the vertical direction.

[0229] The rear end of the mounting portion 82 (more specifically, the portion that protrudes further rearward than the dust collection and discharge portion 73) is configured as a rear rail 82B. That is, the rear rail 82B extends in the left-right direction behind the dust collection and discharge outlet 74. Furthermore, when the dust collection device body 150 is mounted on the adapter 41, the rear rail 82B is inserted into the rear rail groove 142C2 of the adapter 41 in a manner that allows it to slide in the front-back direction, and engages with the rear rail groove 142C2 in the vertical direction.

[0230] Furthermore, a cover plate portion 84 is formed on the lower side of the mounting portion 82. The cover plate portion 84 is also formed in the same manner as the mounting portion 82, and is generally rectangular in shape with the thickness direction in the vertical direction, and is connected to the dust collection and discharge portion 73. Moreover, the cover plate portion 84 is disposed on the upper side of the edge of the first exposure hole 151D in the dust collection housing 151, blocking the first exposure hole 151D.

[0231] (Regarding locking member 86) Locking member 86 is disposed on the rear side of the mounted member 80, and is mounted in the dust collection housing 151 within the step portion 151C of the dust collection housing 151 in a manner that allows it to slide in the left-right direction. Specifically, locking member 86 is configured in such a way that it becomes Figure 18 The locked state shown is pushed to the right by a spring (not shown), and can be switched from the locked state to the permissible state of sliding to the left by the operator's operation.

[0232] The locking member 86 is formed in a generally L-shaped plate shape. Specifically, the locking member 86 includes a locking operation part 86A in the front-to-back direction along the plate thickness direction and a locking body part 86B extending forward from the upper end of the locking operation part 86A.

[0233] The locking operation part 86A is exposed in a manner that allows it to be operated rearward from the dust collection housing 151. That is, when the dust collection device body 150 is installed on the adapter 41, the locking operation part 86A is disposed behind the adapter locking member 49 of the adapter 41, and is positioned between the pair of adapter locking members 49 when viewed from the rear. A locking part 86C is formed on the upper surface of the locking body part 86B, and the locking part 86C is disposed in the second exposure hole 151E of the step portion 151C in the dust collection housing 151.

[0234] Furthermore, when the dust collection device body 150 is installed on the adapter 41, the dust collection device body 150 is slid rearward, thereby causing the locking part 86C to abut against the inclined surface formed on the front surface of the locking hook part 42K and slide to the left, thus being disposed in the locking recess 46A of the adapter 41 (see reference). Figure 14 The locking part 86C is indicated by the single-dot dash. Furthermore, a spring (not shown) moves the locking member 86 to the right and switches it to the locked state, thereby placing the locking part 86C adjacent to the rear side of the locking hook part 42K (see reference). Figure 14 The locking part 86C (represented by the double-dotted line) is designed to engage with the locking hook part 42K of the adapter 41 in the front-rear direction. This prevents the dust collection device body 150 from being removed from the adapter 41. Alternatively, the structure can be modified such that by switching the locking member 86 to the permissible state through operator operation, the engagement between the locking part 86C and the locking hook part 42K is released. This allows for relative movement of the dust collection device body 150 towards the front relative to the adapter 41, while allowing the dust collection device body 150 to be removed from the adapter 41.

[0235] (Effects) Next, the order in which the dust collection device 40 is installed on the hammer drill 10 will be explained, and the function and effects of the second embodiment will be explained.

[0236] During the installation of the dust collection device 40 onto the hammer drill 10, the adapter 41 is first installed onto the hammer drill 10. Specifically, as follows: Figure 19As shown, the adapter 41 is configured with its support shaft 143 tilted backward, positioned to the left of the support hole 13G of the hammer drill 10. Then, the support shaft 143 is inserted into the support hole 13G from the left. After inserting the support shaft 143 into the support hole 13G, the adapter 41 is positioned towards one side of the circumference of the support shaft 143. Figure 19 The adapter 41 rotates (to the direction of arrow B). As a result, the upper end of the adapter connection 142D of the adapter 41 is inserted from below into the front air intake 13B of the hammer drill 10. Furthermore, the locking hook 49B of the adapter locking member 49 is inserted into the locking recess 13E of the body housing 13, and the adapter locking member 49 is locked into the body housing 13. Through the above, the adapter 41 is installed on the hammer drill 10.

[0237] After the adapter 41 is installed on the hammer drill 10, the dust collection device body 150 is installed on the adapter 41. Specifically, as follows: Figure 20 As shown, the mounting portion 82 of the dust collection device body 150 is positioned at the front of the adapter 41. In this state, the dust collection device body 150 is moved rearward relative to the adapter 41, and the mounting portion 82 of the dust collection device body 150 is inserted into the mounting recess 142B of the adapter 41. Specifically, the left and right side rails 82A of the dust collection device body 150 are inserted from the front into the side rail grooves 142C1 of the adapter 41. After the side rails 82A are inserted into the side rail grooves 142C1, the dust collection device body 150 is moved further rearward relative to the adapter 41, and the rear rail 82B of the dust collection device body 150 is inserted from the front into the rear rail groove 142C2 of the adapter 41.

[0238] When the rear rail 82B is inserted into the rear rail groove 142C2, the dust collection discharge portion 73 of the dust collection device body 150 is disposed adjacent to the lower side of the adapter connection portion 142D of the adapter 41, and the dust collection discharge outlet 74 of the dust collection device body 150 is connected to the front air intake 13B of the hammer drill 10. Thus, the mounting portion 82 of the dust collection device body 150 is mounted in the mounting recess 142B of the adapter 41. Furthermore, when the mounting portion 82 is mounted in the mounting recess 142B, the step portion 151C of the dust collection device body 150 is disposed adjacent to the lower side of the locking operation portion 49C of the adapter locking member 49.

[0239] Furthermore, when the mounting part 82 is installed in the mounting recess 142B, as described above, the dust collection device body 150 is slid rearward, thereby causing the locking part 86C to slide to the left via the inclined surface of the front surface of the locking hook part 42K, and thus be disposed in the locking recess 46A of the adapter 41. Then, the locking member 86 is moved to the right by a spring (not shown) and switched to the locked state, thereby placing the locking part 86C adjacent to the rear side of the locking hook part 42K, and engaging the locking part 86C with the locking hook part 42K in the front-rear direction. As a result, the relative movement of the dust collection device body 150 relative to the adapter 41 towards the front is restricted, thereby completing the installation of the dust collection device 40 onto the hammer drill 10.

[0240] After the dust collection device 40 is installed on the hammer drill 10, the operator activates the trigger 15 of the hammer drill 10, thereby driving the motor 20 and causing the tip tool T to rotate around its own axis. This allows for piercing of the workpiece. Specifically, the tip tool T is pressed against the workpiece side to perform piercing. Furthermore, when the motor 20 is driven, the fan 23 rotates together with the drive shaft 21 of the motor 20.

[0241] Furthermore, when the hammer drill 10 is operating, the second fan section 23B of the fan 23 generates an airflow AR from the dust collection device body 150 toward the hammer drill 10 (see reference). Figure 10 Specifically, at the suction port 154B of the dust collection device body 150, an airflow AR is generated that draws air radially inward from the tool insertion part 54C into the interior of the suction part 154.

[0242] As a result, the air surrounding the tip of the tip tool T is drawn into the interior of the dust collection device body 150 by the suction port 154B. That is, dust surrounding the tip tool T, including dust generated during the piercing process, flows into the interior of the suction section 154 from the suction port 154B along with the air. Furthermore, during piercing of the workpiece, as the piercing process proceeds, the hammer drill 10 approaches the workpiece, causing the tool insertion section 54C of the dust collection device body 150 to come into contact with the workpiece. Therefore, during the piercing process of the hammer drill 10, the workpiece presses the suction section 154 backward. As a result, the front suction pipe 57 of the air inlet section 152 contracts, and the sliding arm 153 and the suction section 154 are displaced backward.

[0243] The airflow AR flowing into the suction section 154 flows rearward through the suction pipe 155 and exits downward from the pipe outlet 56A. The airflow AR exiting downward from the pipe outlet 56A flows into the rear outer cylinder 62 of the cyclone outer cylinder 61 from the cyclone inlet 64. Furthermore, the airflow AR flowing into the rear outer cylinder 62 flows forward while rotating around the cyclone axis 61A along the inner circumferential surface of the rear outer cylinder 62, and exits from the front end of the rear outer cylinder 62 into the interior of the front outer cylinder 63 (see reference). Figure 12 and Figure 17 The airflow AR flows out of the interior of the front outer cylinder 63 while rotating around the axis of the cyclone axis 61A along the inner circumference of the front outer cylinder 63 and flowing forward (see reference). Figure 17 The airflow AR. Thus, within the rotating chamber 61B, air and dust are separated, and the separated dust falls from the front opening of the outer cylinder 63 to the lower surface of the dust collection chamber 60B. Furthermore, the airflow AR, now free of dust, flows rearward through approximately the center of the cyclone outer cylinder 61 and into the exhaust inner cylinder 65 (see reference). Figure 17 The airflow AR flows into the exhaust inner cylinder 65 and then into the filter chamber 71 of the filter section 70 from the cyclone outlet hole 66.

[0244] The airflow AR flowing into the filter chamber 71 flows toward the dust collection outlet 74 of the dust collection device body 150. That is, within the filter chamber 71, the airflow AR flows upward and passes through the filter 72, flowing toward the dust collection discharge section 73 (see reference). Figure 10 The dust in the airflow AR is removed by the filter 72, and the dust-free airflow AR flows from the dust collection outlet 74 of the dust collection device body 150 into the body housing 13.

[0245] The airflow AR flowing into the main body housing 13 enters the second fan section 23B from the fan intake 27A of the fan 23. Furthermore, through the second fins 26, the airflow AR flows radially outward from the fan 23 and is discharged from the second exhaust port 13D. In this way, the dust collection device body 150 can draw in the air surrounding the tip tool T, separate the dust contained in the air, and collect the separated dust.

[0246] Furthermore, when piercing the workpiece above the hammer drill 10, the hammer drill 10 is positioned such that the tip of the top tool T faces upwards. Therefore, in the dust collection device 40, the cyclone shaft 61A extends vertically, and the cyclone section 60 is positioned such that the tip of the outer cyclone cylinder 61 faces upwards. Consequently, the airflow AR rotating within the rotating chamber 61B of the outer cyclone cylinder 61 slows down, and there is a possibility that air and dust cannot be adequately separated within the rotating chamber 61B. In this case, there is a concern that dust may not be discharged from the tip of the rotating chamber 61B of the outer cyclone cylinder 61 to the dust collection chamber 60B, and may remain within the rotating chamber 61B. Therefore, there is a possibility that the dust-containing airflow AR may flow from the cyclone section 60 to the downstream side of the air passage section 90.

[0247] Here, in the cyclone section 60 of the dust collection device 40, the cyclone outer cylinder 61 is configured including a rear outer cylinder 62 constituting the rear portion of the cyclone outer cylinder 61 and a front outer cylinder 63 constituting the front portion of the cyclone outer cylinder 61. Furthermore, an opening 61C is formed between the front end of the rear outer cylinder 62 and the rear end of the front outer cylinder 63, and the opening 61C opens rearward along the entire circumferential direction of the front outer cylinder 63 and the rear outer cylinder 62. Therefore, the cyclone section 60 is positioned such that the top end of the cyclone outer cylinder 61 faces upward, so that even if the flow rate of the airflow AR rotating in the rotating chamber 61B slows down and dust remains in the rotating chamber 61B, the dust remaining in the rotating chamber 61B can still be discharged from the opening 61C to the dust collection chamber 60B. This prevents the airflow AR containing dust from flowing from the cyclone section 60 to the downstream side of the air passage section 90. Therefore, the dust collection performance of the dust collection device 40 can be improved.

[0248] Furthermore, the inner circumferential surface of the front outer cylinder 63 slopes radially inward in a straight line as it faces forward. That is, the inner diameter of the rear end of the front outer cylinder 63 is set to be larger than the inner diameter of the front end of the front outer cylinder 63. As a result, the airflow AR in the rotary chamber 61B can be accelerated, thereby discharging the separated dust from the rotary chamber 61B to the dust collection chamber 60B.

[0249] Furthermore, the front outer cylinder 63 is integrally formed with the first housing 58A, and the rear outer cylinder 62 is integrally formed with the second housing 58B. As a result, an opening 61C can be easily formed between the rear outer cylinder 62 and the front outer cylinder 63.

[0250] Furthermore, in the dust collection device 40, the suction port 154B is positioned at the front relative to the cyclone section 60. Therefore, dust generated around the tip of the tip tool T extending forward from the main body housing 13 can be conveyed to the rear in the dust collection device 40, thereby separating it from the air in the cyclone section 60.

[0251] In the second embodiment, in the cyclone section 60, the opening 61C opens rearward along the entire circumferential direction of the front outer cylinder 63 and the rear outer cylinder 62, connecting the dust collection chamber 60B and the rotating chamber 61B. However, the method of connecting the dust collection chamber 60B and the rotating chamber 61B is not limited to this. For example, the outer diameter of the front end of the rear outer cylinder 62 can be the same as that of the rear end of the front outer cylinder 63, connecting the front end of the rear outer cylinder 62 to the rear end of the front outer cylinder 63, and forming an opening 61C that opens radially outward between the rear outer cylinder 62 and the front outer cylinder 63. That is, the opening 61C can be shaped to allow dust remaining in the rotating chamber 61B to be discharged into the dust collection chamber 60B.

[0252] Furthermore, in the second embodiment, when viewed in side cross-section, the inner circumferential surface of the front outer cylinder 63 in the cyclone section 60 is inclined radially in a straight line towards the front. In other words, the inner circumferential surface of the front outer cylinder 63 is composed of a single inclined surface. Alternatively, the inner circumferential surface of the front outer cylinder 63 may be composed of multiple inclined surfaces. Moreover, when viewed in side cross-section, the inner circumferential surface of the front outer cylinder 63 can be bent into an arc shape.

Claims

1. A dust collection device, installed at the air intake of a piercing tool, for drawing in dust-containing air from around the tip of the piercing tool and discharging air from which the dust has been separated. The dust collection device includes: The suction section has suction ports disposed around the tip tool; The air intake passage is connected to the suction section and is configured to extend and retract in the front-to-back direction. A cyclone section, connected to the intake passage, causes the air flowing out of the intake passage to rotate, thereby centrifugally separating dust; and The filter section, connected to the cyclone section, has a filter chamber that houses the filter inside, and a discharge section formed as a rectangular cylinder extending through the vertical direction. The discharge section has an outlet that discharges air passing through the filter to the air intake of the perforating tool. The cyclone section includes: The outer cylinder of the cyclone is formed in a cylindrical shape centered on the cyclone axis along the front-to-back direction. The cyclone inlet connects the intake passage to the outer cyclone cylinder, allowing air to circulate along the inner circumferential surface of the outer cyclone cylinder. The cyclone outlet connects the outer cylinder of the cyclone to the filter section. The air intake passage is arranged on the upper side relative to the cyclone section. The discharge section is positioned above the filter. The filter section, viewed from the front-to-back direction, overlaps with the cyclone section and the air intake passage section.

2. The dust collection device according to claim 1, wherein the air intake passage is disposed in front of the filter.

3. The dust collection device according to claim 1 or 2, wherein the cyclone section is configured as follows: The cyclone inlet has a guiding surface, which, when viewed along the front-to-back direction, extends from the inner circumference of the cyclone outer cylinder towards the tangential direction of the cyclone outer cylinder; and The cyclone outlet is formed at the rear end of the outer cyclone cylinder.

4. The dust collection device according to claim 3, wherein the cyclone section has a plurality of cyclone outer cylinders, cyclone inlet sections, and cyclone outlet sections of the same number.

5. The dust collection device according to claim 4, wherein, viewed along the front-to-back direction, the suction passage and the cyclone section are arranged along the vertical direction. The cyclone section has a pair of cyclone outer cylinders, which are arranged in a left-right direction.

6. The dust collection device according to claim 5, wherein, in the left-right direction, the center of the suction passage is disposed between the cyclone shafts of the pair of cyclone outer cylinders.

7. The dust collection device according to claim 3, wherein The cyclone outer cylinder has: The first cylindrical section forms the rear portion of the outer cyclone cylinder, and its inner diameter is fixed; and The second cylindrical section, which forms the front part of the outer cyclone cylinder, has an inner diameter at the rear end that is larger than that at the front end. A gap is formed between the first cylindrical portion and the second cylindrical portion, and the inner diameter of the rear end portion of the second cylindrical portion is set to be larger than the inner diameter of the first cylindrical portion.

8. The dust collection device according to claim 3, wherein, viewed along the front-to-back direction, the suction passage and the cyclone section are arranged along the left-to-right direction. The filter is formed into a pleated shape folded along the front-to-back direction. The cyclone outlet is disposed on the lower side relative to the filter, and the exhaust outlet is disposed on the upper side relative to the filter.

9. A piercing tool system, comprising: Piercing tools; and The dust collection device, The piercing tool includes: A motor, having a drive shaft; The top tool is driven by the rotation of the drive shaft; The mechanism drives the top tool by rotating the drive shaft; A housing that houses the motor and the mechanism, and mounts the dust collection device according to any one of claims 1 to 8, having an air intake connected to the exhaust port of the dust collection device; and A fan, housed within the housing, generates an airflow from the suction port of the dust collection device toward the air intake port through the rotation of the drive shaft.

10. The piercing tool system of claim 9, wherein The housing is comprised of the following components: The main body housing section houses the motor and the mechanism section; and The handle housing portion extends from the rear end of the main body housing portion and has a handle portion for the operator to grip. In the front-to-back direction, the filter section is located between the cyclone section and the handle section.

11. The piercing tool system of claim 10, wherein the body housing portion extends in a front-rear direction.

12. The piercing tool system according to any one of claims 9 to 11, wherein the fan, the air intake, and the filter are arranged in overlapping positions in the front-to-back direction.

13. The perforation tool system of claim 12, wherein, in the front-to-back direction, the filter section is disposed between the fan and the mechanism section.

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