Dust collection attachment

Abstract

To provide a technology which enables a worker to check an embedded object while inhibiting deterioration of working efficiency of drilling work.SOLUTION: A dust collection attachment is configured to be used with a drilling tool and suction dust occurring during drilling work. The dust collection attachment includes a suction part and a detection part. The suction part has an insertion opening and a suction port. The insertion opening is an opening through which a tip tool removably held by the drilling tool may be inserted. The suction port is an opening into which dust is suctioned. The detection part includes a sensor configured to detect a metal in a detection range.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a dust collection attachment used to suck up dust generated during drilling operations with a drilling tool. [Background technology]

[0002] When drilling an object (e.g., a concrete wall) with a drilling tool, if metal (e.g., rebar) is buried in the object, the tip tool (e.g., a drill bit) may interfere with the metal and become locked. Therefore, a portable buried object detection device is known that enables a worker to confirm the location of the buried object in advance (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-134492 Summary of the Invention [Problem to be solved by the invention]

[0004] The buried object detection device described above makes it easy to check buried objects in advance, but it also reduces the efficiency of drilling work.

[0005] In view of the above-mentioned circumstances, one non-limiting object of the present disclosure is to provide a technique that enables buried objects to be confirmed while suppressing a decrease in the efficiency of drilling work. [Means for solving the problem]

[0006] According to one non-limiting aspect of the present disclosure, there is provided a dust collection attachment for use with a drilling tool to suck up dust generated during drilling operations. The dust collection attachment includes a suction unit and a detection unit. The suction unit has an insertion opening and a suction port. The insertion opening is an opening through which a tool accessory removably held on the drilling tool can be inserted. The suction port is an opening through which dust is sucked. The detection unit includes a sensor configured to detect metal within a detection range.

[0007] According to this aspect, since the dust collection attachment used in the drilling work is equipped with a sensor capable of detecting metal, the user can use the dust collection attachment to search for metal buried in the object to be drilled. Therefore, the user does not need to prepare the dust collection attachment after operating a separate buried object detection device, which prevents a decrease in work efficiency. In particular, when drilling holes at multiple locations, work efficiency can be significantly improved compared to using separate buried object detection devices. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an overall perspective view of a dust collection system according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the dust collection system. [Figure 3] FIG. 2 is a rear view of the suction nozzle and the sensor unit. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 10 is an overall perspective view of a dust collection system according to a second embodiment. [Figure 6] FIG. 10 is a rear view of the dust collection attachment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one non-limiting embodiment of the present disclosure, the sensor (e.g., detection coil) may be disposed adjacent to (near) the suction portion (particularly the insertion opening). According to this embodiment, the sensor can detect metal embedded in the object to be drilled near the position where the tool bit is disposed. Note that it is preferable that the distance between the sensor (e.g., detection coil) and the suction portion (particularly the insertion opening) is as close to zero as possible.

[0010] In addition to or instead of the above embodiment, the detection unit may include an annular portion disposed around the insertion opening of the suction unit. The detection unit may be connected to the suction unit such that the center of the annular portion and the center of the insertion opening substantially coincide with each other. This embodiment allows for a compact arrangement of the suction unit and the detection unit.

[0011] In addition to or instead of the above embodiment, the detection unit may be detachable from the dust collection attachment. According to this embodiment, when buried metal detection is not required, the user can detach the detection unit and use the dust collection attachment, thereby improving operability.

[0012] In addition to or instead of the above embodiment, the tool may further include a first operating unit configured to be manually operated by a user to reset the detection standard of the sensor. According to this embodiment, after the sensor detects a metal tool bit, the user can manually operate the first operating unit to prevent the tool bit from being detected.

[0013] In addition to or instead of the above embodiment, the dust collection attachment may further include an indicator unit. The suction unit may have an axis passing through the insertion opening. This axis may be, for example, an axis passing through the center of the insertion opening or an axis that substantially coincides with the longitudinal axis of the tool bit when the tool bit is inserted through the insertion opening. The sensor may be configured to detect the relative positional relationship between the sensor and metal within the detection range. The indicator unit may be configured to provide, based on the sensor detection results, first information regarding the distance between the metal and the sensor and second information regarding the distance between the metal and the axis in a direction perpendicular to the axis. According to this embodiment, the first information and second information provided by the indicator unit allow the user to recognize not only whether metal is near the sensor but also whether metal is buried at the location targeted by the tool bit. This allows the user to more appropriately determine whether or not to drill a hole at that location.

[0014] In addition to or instead of the above embodiment, the dust collection attachment may be detachable from the tool body of the drilling tool. According to this embodiment, the dust collection attachment equipped with the sensor can be held integrally with the drilling tool, thereby further improving work efficiency.

[0015] In addition to or in place of the above embodiment, a dust collection system including a drilling tool and a dust collection attachment is provided. The drilling tool may include a motor, a control device configured to control the driving of the motor, and a tool body that houses the motor and the control device. The dust collection attachment may be removably attached to the tool body. The sensor of the dust collection attachment may be configured to measure the distance between the sensor and a metal within a detection range. The control device of the drilling tool may be configured not to drive the motor when the distance between the metal and the sensor is shorter than a predetermined distance. According to this embodiment, if the motor is not driven despite an activation operation of the motor, the user can recognize the possibility that the tool bit may interfere with the metal, even if no notification is given. Furthermore, because the tool bit is not driven, the possibility that the tool bit will interfere with the metal and become locked can be more reliably reduced.

[0016] In addition to or instead of the above embodiment, the dust collection attachment may be detachably attached to a dust collector that can operate independently of the drilling tool. According to this embodiment, the dust collection attachment attached to the dust collector can be used regardless of the type of drilling tool.

[0017] In addition to or instead of the above embodiment, the dust collection attachment may further include a second operating unit that is manually operated by a user to activate the dust collector. According to this embodiment, the user can perform metal detection with the dust collection attachment and also manually operate the second operating unit to activate the dust collector, thereby further improving work efficiency.

[0018] Representative and non-limiting embodiments of the present disclosure will be specifically described below with reference to the drawings.

[0019] First Embodiment Hereinafter, the dust collection system 1A according to the first embodiment will be specifically described with reference to FIGS.

[0020] First, a schematic configuration of the dust collection system 1A will be described. As shown in Figures 1 and 2, the dust collection system 1A includes a drilling tool 7 and a dust collection attachment 2. The drilling tool 7 is an example of a power tool that performs drilling work by rotationally driving a tool tip 91 (e.g., a drill bit). The dust collection attachment 2 is a device that is removably attached to the drilling tool 7 and configured to suck in and collect dust generated during drilling work by the drilling tool 7.

[0021] In the dust collection system 1A of this embodiment, an airflow for sucking in dust is generated by rotating a fan 75 in response to driving of a motor 74 of the drilling tool 7. For this purpose, an air intake port 711 is provided in the tool body 71 of the drilling tool 7, which communicates with an exhaust port 218 of the dust collection attachment 2 when the dust collection attachment 2 is attached to the drilling tool 7. A dust collection space 220 in which a filter 221 is disposed is formed within the dust collection attachment 2. Also, an air flow path is defined within the dust collection attachment 2, from a suction port 237 through which dust is sucked, via the dust collection space 220, to the exhaust port 218. Dust that flows into the dust collection attachment 2 together with air from the suction port 237 and reaches the dust collection space 220 is separated from the airflow by the filter 221 and remains in the dust collection space 220. On the other hand, the air passes through the filter 221 and reaches the exhaust port 218, flows into the tool body 71 of the drilling tool 7, and is discharged to the outside of the tool body 71 through an exhaust port (not shown) provided in the tool body 71.

[0022] The detailed configurations of the drilling tool 7 and the dust collection attachment 2 will be described below in order.

[0023] First, the drilling tool 7 will be described. As shown in Figures 1 and 2, the drilling tool 7 mainly includes a tool body 71 to which the dust collection attachment 2 can be attached and detached, a handle 73 connected to the tool body 71, a tool holder 72, a motor 74, a fan 75, and a drive mechanism 77, all of which are arranged within the tool body 71.

[0024] The tool holder 72 is configured to removably hold a tool bit 91 (e.g., a drill bit) and is supported within the tool body 71 so that the tool bit 91 is rotatable about the drive axis DX. The tool bit 91 is attached to the tool holder 72 so that its longitudinal axis coincides with the drive axis DX. The tool holder 72 is rotated about the drive axis DX via the drive mechanism 77 in response to the driving of the motor 74. This causes the tool bit 91 to rotate and perform a drilling operation. In addition, the fan 75 fixed to the output shaft 741 of the motor 74 is rotated in response to the driving of the motor 74, and as described above, an airflow for sucking in dust is generated.

[0025] Although detailed description will be omitted, the drilling tool 7 of this embodiment is a hammer drill, and the drive mechanism 77 is capable of not only rotating the bit 91 but also striking the bit 91. However, the drilling tool 7 may be capable of only rotating the bit 91.

[0026] The handle 73 includes a grip portion 731 that is gripped by the user. One end of the grip portion 731 is provided with a trigger 732 that is pressed by the user. The grip portion 731 is spaced from the tool body 71 and extends in a direction perpendicular to the drive axis DX. For ease of explanation, the extension direction of the drive axis DX will be defined as the front-to-rear direction of the drilling tool 7. In the front-to-rear direction, the side on which the tool bit 91 is attached will be defined as the front side, and the opposite side (the side on which the handle 73 is disposed) will be defined as the rear side. The direction perpendicular to the drive axis DX and corresponding to the extension direction of the grip portion 731 will be defined as the up-to-down direction of the drilling tool 7. In the up-to-down direction, the side on which the trigger 732 is disposed will be defined as the upper side, and the opposite side will be defined as the lower side. The direction perpendicular to the front-to-rear direction and the up-to-down direction will be defined as the left-to-right direction.

[0027] The handle 73 contains a switch 733 that is turned on when the trigger 732 is pressed, and a controller 78 that controls the operation of the drilling tool 7. In this embodiment, the controller 78 includes a microcomputer that includes a CPU, memory, etc. However, the controller 78 may also include a control circuit other than a microcomputer. In addition, the lower end of the handle 73 is provided with a battery mounting section 735 to which a rechargeable battery 93 can be removably attached. In other words, the drilling tool 7 operates using power supplied from the battery 93. However, the drilling tool 7 may also operate using power supplied from an external commercial power source via a power cord.

[0028] In this embodiment, the drilling tool 7 is also provided with a wireless unit 79 capable of wireless communication with an external device. The wireless unit 79 may be removably attached to the tool body 71, or may be permanently built into the tool body 71. Because the wireless unit 79 has a known configuration, detailed illustrations are omitted; however, the wireless unit 79 includes at least an antenna and a transmission / reception circuit. The wireless unit 79 is electrically connected to the controller 78 and configured to wirelessly transmit and receive signals to and from the external device in response to control signals from the controller 78.

[0029] Next, a description will be given of the dust collection attachment 2. For convenience, the direction of the dust collection attachment 2 will be based on the direction of the drilling tool 7 when the dust collection attachment 2 is attached to the drilling tool 7.

[0030] As shown in FIG. 1, the dust collection attachment 2 mainly includes a main body 21, a dust box 22, a suction nozzle 23, a slide portion 26, a hose 27, and a sensor unit 5.

[0031] The main body 21 is configured to be detachably attached to the tool body 71 of the drilling tool 7. In this embodiment, the main body 21 is configured to abut against the front surfaces of the center and lower end of the tool body 71 and the lower surface of the lower end when attached to the tool body 71. Receiving portions 713 are formed on the left and right walls of the lower end of the tool body 71, respectively. The main body 21 of the dust collection attachment 2 is provided with engaging portions 213 that can engage with the receiving portions 713 in portions that are located on the left and right sides of the lower end of the tool body 71 when attached to the tool body 71, respectively. The dust collection attachment 2 is attached to the tool body 71 by engagement between the engaging portions 213 and the receiving portions 713.

[0032] In this embodiment, the receiving portion 713 and the engaging portion 213 are configured as a recess (groove) and a hook (latch) that can engage with the recess, respectively. However, the main body 21 may be detachably attached to the tool main body 71 by other known configurations. Furthermore, the tool main body 71 and the main body 21 may be engaged and connected to each other at at least one position different from the above-mentioned positions.

[0033] 2, in this embodiment, an intake port 711 is provided at the lower end of the tool body 71 (specifically, directly below the output shaft 741 of the motor 74). Correspondingly, an exhaust port 218 is provided at a portion of the dust collection attachment 2 that abuts against the lower surface of the lower end of the tool body 71 when attached to the tool body 71.

[0034] The dust box 22 is a container for storing dust. The dust box 22 is detachably connected to the main body 21. A filter 221 is disposed inside the dust box 22 and is held by a filter holder 223. The internal space of the dust box 22 functions as a dust storage space 220. An exhaust path is defined inside the main body 21, through which air that has passed through the filter 221 reaches the exhaust port 218.

[0035] 2 and 3, the suction nozzle 23 is a portion disposed near the tip tool 91 so as to partially contact the object to be drilled. In this embodiment, the suction nozzle 23 includes an annular portion 231, an arm portion 236, and a connecting portion 24. The suction nozzle 23 in this embodiment is made of synthetic resin.

[0036] The annular portion 231 is a generally annular (short cylindrical) portion having an insertion opening 232 in its center. A front surface 233 of the annular portion 231 functions as a surface (contact surface) that contacts the surface of the workpiece during drilling. The insertion opening 232 is a through-hole with a circular cross section through which the tool bit 91 can be inserted. When the dust collection attachment 2 is attached to the drilling tool 7, the tool bit 91 passes through approximately the center of the insertion opening 232. In other words, the drive axis DX of the drilling tool 7 (the long axis of the tool bit 91) and the central axis C1 of the annular portion 231 (the insertion opening 232) substantially coincide with each other. Note that a rubber cap 234 having slits formed radially from the center is usually removably attached to the annular portion 231 to cover the insertion opening 232 (see FIGS. 1 and 2).

[0037] The arm portion 236 is a cylindrical portion connected to a part of the annular portion 231, and extends linearly radially outward from the annular portion 231. An opening at one end of the arm portion 236 communicates with the insertion opening 232, and air and dust flow into the suction nozzle 23 from this opening (hereinafter referred to as the suction port 237). The internal space of the arm portion 236 functions as a suction path 238 through which the air and dust sucked in from the suction port 237 pass. The suction path 238 extends from the suction port 237 to the other end of the arm portion 236 (the end opposite the annular portion 231).

[0038] As shown in FIGS. 3 and 4, the connecting portion 24 is a portion that is detachably connected to the sensor unit 5 (described later). The connecting portion 24 includes two first protrusions 241 and three second protrusions 246 that protrude radially outward from the outer circumferential surface of the annular portion 231. The connecting portion 24, together with the annular portion 231, constitutes the tip portion 230 of the suction nozzle 23. The two first protrusions 241 are positioned on the diameter of the annular portion 231. A rectangular strip-shaped engagement piece 242 is connected to the tip of each of the first protrusions 241. The engagement piece 242 is spaced radially outward from the outer periphery of the annular portion 231 and extends in the front-to-rear direction. Each of the second protrusions 246 has a recess at its tip. The connection structure between the connecting portion 24 and the sensor unit 5 will be described in detail later.

[0039] 1 and 2, in this embodiment, the suction nozzle 23 is connected to and supported by the slide part 26. The slide part 26 is a hollow body that extends linearly in the front-rear direction on the left side of the main body 21, and is supported so as to be slidable in the front-rear direction relative to the main body 21. A base end of the suction nozzle 23 (an end of the arm part 236) is fixed to the front end of the slide part 26.

[0040] The hose 27 is a flexible tubular member. One end of the hose 27 is connected to the base end of the suction nozzle 23 within the front end of the slide portion 26, and the hose 27 extends within the slide portion 26. The other end of the hose 27 is connected to a tubular portion 215 provided at the rear end of the main body 21. The internal space of the hose 27 communicates with the internal space of the suction nozzle 23 (i.e., the suction path 238) and the internal space of the tubular portion 215. Although not shown in detail, the internal space of the tubular portion 215 communicates with the dust collection space 220 via a passage defined within the rear end of the main body 21. In other words, a dust transfer path connecting the suction path 238 and the dust collection space 220 is defined within the hose 27 and the main body 21.

[0041] Although not shown in detail, a coil-shaped biasing member is embedded in the hose 27, and the suction nozzle 23, the slide portion 26, and the hose 27 are constantly biased forward. When the drilling operation progresses with the annular portion 231 of the suction nozzle 23 in contact with the object to be drilled, the suction nozzle 23, the slide portion 26, and the hose 27 move backward relative to the main body 21 and the drilling tool 7 against the biasing force of the biasing member.

[0042] 3 and 4, the sensor unit 5 is a unit including a sensor 51, and is detachably connected to the suction nozzle 23 so as to be adjacent to the tip 230 (insertion opening 232) of the suction nozzle 23. In this embodiment, the sensor unit 5 includes the sensor 51, a control unit 52, a housing 53, a wireless communication unit 55, an operation unit 56, and an indicator unit 57.

[0043] The sensor 51 is configured to detect metal within a predetermined detection range in a non-contact manner. Furthermore, the sensor 51 can detect the relative positional relationship between the metal within the detection range and the sensor 51. Any known sensor may be used as the sensor 51. For example, an electromagnetic induction type, a magnetic capacitance type, or the like may be used as the detection method.

[0044] In this embodiment, the sensor 51 is, for example, an electromagnetic induction sensor having a known configuration. The sensor 51 includes a detection coil 511 and a circuit unit 514 electrically connected to the detection coil 511. In this embodiment, the detection coil 511 is wound around a cylindrical spool 512. Although not shown in detail, the circuit unit 514 includes various circuits (e.g., an oscillation circuit, a detection circuit, and an output circuit) mounted on a substrate 510. The circuit unit 514 determines the relative positional relationship between the detected metal and the sensor 51 and outputs a signal indicating this positional relationship to the control unit 52. In this embodiment, the circuit unit 514 is, for example, configured to determine the relative positional relationship between the detected metal and a reference point P set on the central axis C2 of the detection coil 511 (spool 512).

[0045] The control unit 52 is configured to control the operation of the sensor unit 5. In this embodiment, the control unit 52 is a microcomputer including a CPU, memory, etc., and is mounted on the same board 510 as the circuit unit 514 of the sensor 51. However, the control unit 52 may be configured as a control circuit other than a microcomputer. Furthermore, the control unit 52 and the circuit unit 514 may be mounted on different boards. The control unit 52 is electrically connected to the circuit unit 514 of the sensor 51, the wireless communication unit 55, the operation unit 56, and the indicator unit 57, which will be described later. The operation of the control unit 52 will be described later.

[0046] The housing 53 is a hollow body that accommodates the sensor 51. In this embodiment, the housing 53 is made of synthetic resin. The housing 53 includes a coil accommodating portion 531, a circuit accommodating portion 535, and a connecting portion 54.

[0047] The coil accommodating portion 531 is an annular portion that accommodates the detection coil 511 (spool 512) of the sensor 51. More specifically, the coil accommodating portion 531 is a hollow portion that has a generally annular shape when viewed from the front or rear and has a thickness in the front-to-rear direction. The inner diameter of the coil accommodating portion 531 is larger than the outer diameter of the tip portion 230 of the suction nozzle 23 (the diameter of a circle C (see FIG. 3) that defines the outer edge of the tip portion 230). The coil accommodating portion 531 is connected to the annular portion 231 of the suction nozzle 23 via the connecting portions 24 and 54 and is disposed radially outward of and concentric with the annular portion 231. The central axis C2 of the coil accommodating portion 531 and the detection coil 511 substantially coincides with the central axis C1 of the annular portion 231. When the dust collection attachment 2 is attached to the drilling tool 7, the detection coil 511 is disposed so as to surround the tool bit 91. Therefore, the reference point P of the sensor 51 is located substantially on the drive axis DX (see FIG. 2).

[0048] Note that a distance D2 from a circle C (the protruding end of the second protrusion 246 of the connecting portion 24) that defines the outer edge of the tip portion 230 of the suction nozzle 23 to the outer edge of the coil accommodating portion 531 (annular portion) is smaller than a radius D1 of the circle C that defines the outer edge of the tip portion 230. As a result, in the radial direction of the annular portion 231, the coil accommodating portion 531 is accommodated in a relatively small area around the tip portion 230 of the suction nozzle 23, thereby realizing a compact arrangement of the tip portion 230 and the coil accommodating portion 531. Furthermore, since the detection coil 511 is disposed adjacent to the insertion opening 232, metal embedded in the object to be drilled can be detected near the position targeted by the tip tool 91.

[0049] Furthermore, the front surface 532 of the coil accommodating portion 531 is disposed in substantially the same plane as the front surface 233 of the annular portion 231 of the suction nozzle 23. The front surface 532 of the coil accommodating portion 531 and the front surface 233 of the annular portion 231 function as surfaces (contact surfaces) that come into contact with the surface of the object to be drilled during drilling. However, the front surface 532 of the coil accommodating portion 531 may be located behind the front surface 233 of the annular portion 231.

[0050] The detection coil 511 and reference point P of the sensor 51 are arranged near the front surface 532 (contact surface) of the coil accommodating section 531 in a direction perpendicular to the front surface 532 (contact surface) (i.e., the front-rear direction). In this embodiment, the front end (end on the side of the object to be drilled) of the detection coil 511 and the reference point P are arranged forward (on the side of the object to be drilled) of the rear end of the annular portion 231 of the suction nozzle 23. This arrangement of the detection coil 511 reduces the possibility that the sensor 51 will detect metal other than the metal embedded in the object to be drilled. Furthermore, the user can easily detect metal embedded in the object to be drilled by bringing the contact surface into contact with the object to be drilled.

[0051] The circuit accommodating portion 535 is a portion that accommodates the circuit board 510 and the like of the sensor 51, and is formed in a box shape. The circuit accommodating portion 535 is connected to a part of the coil accommodating portion 531, and protrudes radially outward from the coil accommodating portion 531. In addition to the circuit board 510, the circuit accommodating portion 535 accommodates the wireless communication unit 55 and a battery 59 that functions as a power source for the sensor unit 5 (see FIG. 4). The battery 59 may be a disposable battery or a rechargeable battery.

[0052] The connecting portion 54 is a portion that is detachably connected to the connecting portion 24 of the suction nozzle 23. The connecting portion 54 includes two engagement pieces 541 and four engagement protrusions 546 provided on the inner circumferential surface of the coil accommodating portion 531 (however, one of them is hidden by the arm portion 236 in FIG. 3).

[0053] The two engagement pieces 541 are arranged on the diameter of the coil accommodating portion 531 so as to correspond to the engagement pieces 242 at the tips of the first protrusions 241 of the connecting portion 24 of the suction nozzle 23. Each of the engagement pieces 541 is formed in a rectangular band shape. With its front end connected to the inner circumferential surface of the front end of the coil accommodating portion 531, the engagement piece 541 extends in the front-rear direction radially outside the engagement pieces 242 and can bend in the radial direction of the coil accommodating portion 531. A claw (protrusion) 542 protruding radially inward is provided at the rear end of the engagement piece 541. With the claw 542 engaged with the rear end (protruding end) of the engagement piece 242, the engagement piece 541 is snap-engaged with the engagement piece 242.

[0054] Three of the four engaging protrusions 546 are provided to correspond to the three second protrusions 246 of the connecting portion 24 of the suction nozzle 23. More specifically, each of the engaging protrusions 546 extends in the front-rear direction along the inner circumferential surface of the coil accommodating portion 531. The last three of the engaging protrusions 546 are fitted into recesses at the tips of the second protrusions 246.

[0055] As described above, the sensor unit 5 is connected to the suction nozzle 23 by the engagement between the first protrusion 241 (engagement piece 242) and the engagement piece 541, and the engagement between the second protrusion 246 (recessed portion at the tip) and the engagement protrusion 546. The user can remove the sensor unit 5 from the suction nozzle 23 by bending the engagement piece 541 radially outward, disengaging the claw 542 from the engagement piece 242, and moving the sensor unit 5 backward relative to the suction nozzle 23.

[0056] Furthermore, the user can attach the sensor unit 5 to the suction nozzle 23 by circumferentially aligning the connecting portion 54 of the sensor unit 5 with the connecting portion 24 of the suction nozzle 23 and moving it forward. Note that the configuration of the connecting portions 24, 54 described above allows the arrangement (orientation) of the sensor unit 5 relative to the suction nozzle 23 to be changed by 180 degrees in the circumferential direction about the central axes C1, C2. Therefore, the user can change the orientation of the sensor unit 5 between an orientation in which the circuit accommodating portion 535 protrudes to the upper left and an orientation in which it protrudes to the lower right, as shown in FIG. 1, depending on the work environment.

[0057] The wireless communication unit 55 is configured to be capable of wireless communication with external devices. Although detailed illustration is omitted, the wireless communication unit 55 includes at least an antenna and a transmission / reception circuit. The wireless communication unit 55 is electrically connected to the control unit 52, and transmits and receives signals wirelessly to and from external devices in response to control signals from the control unit 52.

[0058] The operation unit 56 is provided on the rear surface of the circuit accommodating portion 535. The operation unit 56 is configured to be manually operable by the user. More specifically, the operation unit 56 is an input device through which the user inputs various instructions related to the operation of the sensor unit 5, and is electrically connected to the control portion 52. In this embodiment, the operation unit 56 includes a plurality of push buttons that can be pressed by the user. More specifically, the operation unit 56 includes a power / reset button 561, a wireless start button 563, and a dust collector start button 565.

[0059] The power / reset button 561 is a button that is operated to turn the power of the sensor unit 5 on and off and to reset the detection criteria. When the power / reset button 561 is pressed while the power is off, the power of the sensor unit 5 is turned on. When the power / reset button 561 is pressed continuously for a predetermined time or more while the power is on (when pressed for a long time), the power of the sensor unit 5 is turned off. Furthermore, when the power / reset button 561 is pressed for less than the predetermined time while the power is on (when pressed normally), the detection criteria are reset.

[0060] Because the tool bit 91 is made of metal, the sensor 51 detects the tool bit 91 as a metal within its detection range. Therefore, when the control unit 52 recognizes a normal pressing signal from the power / reset button 561, it resets (adjusts) the detection standard so as not to detect the metal that is currently being detected. Therefore, if the power / reset button 561 is pressed while the sensor 51 is detecting the tool bit 91, the sensor 51 can detect metals other than the tool bit 91.

[0061] The wireless activation button 563 is a button that causes the control unit 52 to activate the wireless communication unit 55, enabling wireless communication with an external device. As described above, in this embodiment, the drilling tool 7 is equipped with a wireless unit 79. When the wireless activation button 563 is pressed and the wireless unit 79 is activated in the drilling tool 7 while the dust collection attachment 2 is attached to the drilling tool 7, the drilling tool 7 is recognized as a communication partner. This enables wireless communication between the wireless communication unit 55 and the wireless unit 79. This procedure is also called pairing, but since this is a well-known technique, its description will be omitted here. Furthermore, if not only the drilling tool 7 but also another external device (e.g., a dust collector) equipped with a wireless unit 79 is within a predetermined communication range and a similar activation operation is performed, the wireless communication unit 55 will be able to communicate with that external device.

[0062] The dust collector start button 565 is a button for starting an external dust collector. As described above, when the dust collector start button 565 is pressed while the wireless communication unit 55 is capable of wireless communication with the external dust collector (when pairing is complete), the control unit 52 causes the wireless communication unit 55 to transmit a predetermined signal to the dust collector. Upon receiving this signal, the dust collector operates.

[0063] The indicator unit 57 is provided adjacent to the operation unit 56 on the rear surface of the circuit accommodating portion 535. The indicator unit 57 is configured to provide information corresponding to the detection result of the sensor 51. In this embodiment, the indicator unit 57 provides two types of information (first information and second information). Therefore, the indicator unit 57 includes a first indicator 571 configured to provide the first information and a second indicator 572 configured to provide the second information. The first information relates to the distance between the detected metal and the sensor 51 (specifically, the reference point P). The second information relates to whether the detected metal is on the central axis C2 of the detection coil 511 or within a predetermined area therearound. The second information can also be said to be information regarding the distance (degree of misalignment) between the metal and the central axis C2 in a direction perpendicular to the central axis C2.

[0064] The first indicator 571 includes, for example, a plurality of LED lights. The control unit 52 determines the distance between the detected metal and the reference point P based on a signal from the circuit unit 514 of the sensor 51. The distance between the metal and the reference point P can be determined, for example, from the magnitude (intensity) of the signal output from the circuit unit 514. The control unit 52 turns on or blinks at least some of the LED lights according to the determined distance. In this embodiment, the control unit 52 changes the number of LED lights that are turned on according to the determined distance. Specifically, the control unit 52 increases the number of lights that are turned on as the distance becomes shorter, and decreases the number of lights that are turned on as the distance becomes longer.

[0065] The second indicator 572 includes, for example, a plurality of LED lights. The control unit 52 can determine the distance between the detected metal and the central axis C2 (central axis C1, long axis of the tool bit 91, drive axis DX) of the detection coil 511, based on a signal from the circuit unit 514 of the sensor 51. The direction perpendicular to the central axis C2 of the detection coil 511 is also a direction substantially parallel to the front surface 532 (contact surface) of the coil accommodating unit 531. The control unit 52 turns on or blinks at least some of the LED lights according to the determined distance.

[0066] In this embodiment, when metal is on the central axis C2 or within a predetermined distance from the central axis C2, the control unit 52 causes all of the multiple LED lights of the second indicator 572, including the central LED light, to flash. For example, the predetermined distance can be set to the radius of the tip tool 91 with the largest diameter that can be attached to the drilling tool 7, or a distance slightly longer than this radius. This allows the second indicator 572 to essentially notify that metal (e.g., rebar) is buried in the position targeted by the tip tool 91 (the position where a hole will be drilled). Furthermore, as the identified distance becomes shorter and approaches the predetermined distance, the control unit 52 turns on the LED lights arranged in a row, starting with the two at the ends and moving toward the center.

[0067] In this way, the indicator unit 57 not only notifies the distance between the sensor 51 and the metal, but also the degree of misalignment between the metal and the position targeted by the tool bit 91. Therefore, by simply visually checking the indicator unit 57, the user can recognize not only whether or not the metal is near the sensor 51, but also whether or not the metal is buried in the position targeted by the tool bit 91. This allows the user to more appropriately determine whether or not it is safe to drill a hole in that position.

[0068] The method of use and operation of the dust collection system 1A will be described below.

[0069] When drilling an object having metal buried therein (for example, a concrete wall or floor with rebar buried therein), the user attaches the dust collection attachment 2 with the sensor unit 5 attached to the drilling tool 7. As described above, the user operates the wireless activation button 563 to pair the sensor unit 5 with the drilling tool 7. After operating the power / reset button 561 to reset the detection standard, the user holds the dust collection system 1A and brings at least a portion of the contact surfaces of the coil accommodating portion 531 and the annular portion 231 into contact with the object to be drilled.

[0070] When the sensor 51 detects metal, the control unit 52, as described above, causes the indicator unit 57 to report the first information and the second information based on the relative positional relationship between the metal and the sensor 51. Thus, the user can visually check the indicator unit 57 to confirm the presence or absence of buried metal and its relative position. If metal is buried in the position targeted by the bit 91, the user can visually check the indicator unit 57 and move the dust collection system 1A to a position suitable for drilling.

[0071] Furthermore, in this embodiment, when the distance between the metal and the sensor 51 is equal to or shorter than a predetermined distance, the control unit 52 causes the wireless communication unit 55 to periodically transmit an error signal to the wireless unit 79 of the drilling tool 7, with which it is communicating. This predetermined distance may be predetermined and stored in memory, or may be input via the operation unit 56. While the controller 78 of the drilling tool 7 recognizes receipt of an error signal via the wireless unit 79, it does not drive the motor 74 even if the switch 733 is turned on in response to pressing of the trigger 732. This more reliably reduces the possibility that the bit tip 91 will interfere with and become locked on the metal embedded in the object to be drilled.

[0072] If the controller 78 of the drilling tool 7 does not recognize the error signal, it drives the motor 74 while the switch 733 is turned on, thereby performing the drilling operation and collecting dust using the airflow generated by the fan 75, as described above.

[0073] Furthermore, when there is no need to detect metals embedded in the object to be drilled, the user can detach the sensor unit 5 from the dust collection attachment 2. This reduces the radial size of the portion of the dust collection attachment 2 that is disposed around the bit 91. This improves the operability of the dust collection attachment 2 (particularly, for example, operability during drilling operations in narrow spaces). Furthermore, the user can use the detached sensor unit 5 alone to detect metals regardless of drilling operations, thereby improving convenience.

[0074] As described above, in the dust collection system 1A of this embodiment, the dust collection attachment 2, which is attached to the drilling tool 7 and used for drilling work, is equipped with a sensor 51 capable of detecting metal. Therefore, a user can detect metal buried in the object to be drilled while holding the drilling tool 7 and the dust collection attachment 2 together, and then immediately start drilling work with the tip 230 of the suction nozzle 23 positioned in an appropriate position. This improves work efficiency compared to operating a separate buried object detection device and then switching to the drilling tool 7 to perform drilling work. In particular, when drilling multiple holes in the object to be drilled, work efficiency can be significantly improved compared to using a separate buried object detection device.

[0075] Second Embodiment Hereinafter, a dust collection system 1B according to the second embodiment will be specifically described with reference to Figures 5 and 6. Note that the same components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0076] The dust collection system 1B includes a drilling tool 7, a dust collector 8, and a dust collection attachment 3. The dust collector 8 is a device separate from the drilling tool 7 and is a known dust collection device that can be used independently of the drilling tool 7. The dust collection attachment 3 is a device that is removably attached to the dust collector 8 and is configured to suck in and collect dust generated during drilling work by the drilling tool 7.

[0077] The configuration of the dust collector 8 will be briefly described below. As shown in Fig. 5, the dust collector 8 includes a main body 81 and a hose 83 connected to the main body 81. Although not shown because this is a well-known configuration, the main body 81 houses a motor and a fan rotated by the motor. The dust collector 8 uses the airflow generated by the fan to suck in and collect dust through the hose 83. In this embodiment, the dust collector 8 operates on power supplied from a rechargeable battery 93, but may also be configured to operate on power supplied from an external commercial power source.

[0078] The main body 81 also accommodates a controller 85 and a wireless unit 89. The wireless unit 89 of the dust collector 8 has substantially the same configuration as the wireless unit 79 (see FIG. 2) of the drilling tool 7. The controller 85 is configured to control the driving of the motor in response to a signal from the wireless unit 89.

[0079] The following describes in detail the configuration of the dust collection attachment 3. As shown in Figures 5 and 6, the dust collection attachment 3 includes a connecting pipe 31, a base portion 33, a suction nozzle 35, and a sensor unit 5.

[0080] The connecting pipe 31 is a cylindrical part that can be attached to and detached from the hose 83 of the dust collector 8. The base part 33 is configured to adhere to a wall or floor using the suction force of the dust collector 8. Since this is a known configuration, the base part 33 is cup-shaped, and its peripheral edge is covered with a sealing member 331 (e.g., rubber). The internal space of the base part 33 communicates with the internal space of the connecting pipe 31. When the dust collector 8 is started with the peripheral edge of the base part 33 in contact with the surface of the wall or floor, negative pressure is created inside the base part 33, and the base part 33 adheres to the surface of the wall or floor. Therefore, even when the user is not holding the dust collecting attachment 3, the dust collecting attachment 3 is held in the arranged position.

[0081] The suction nozzle 35 is a part that is disposed near the tip tool 91 so as to partially abut against the object to be drilled, and is connected to the connecting pipe 31. The suction nozzle 35 of this embodiment includes an annular portion 351 and an arm portion 356. The suction nozzle 35 is made of synthetic resin.

[0082] The annular portion 351 is a generally circular (short cylindrical) portion having an insertion opening 352 in the center and has a central axis C3. One surface of the annular portion 351 functions as a surface (contact surface) that comes into contact with the surface of the object to be drilled during drilling. The insertion opening 352 is a through-hole with a circular cross section through which the tool bit 91 can be inserted. Although not shown in the drawings, in this embodiment as well, a rubber cap with slits formed radially from the center can be attached to the annular portion 351, as in the first embodiment.

[0083] Additionally, the coil accommodating portion 531 of the sensor unit 5 is concentrically arranged around the annular portion 351 (so that the central axes C2 and C3 are aligned). The sensor unit 5 is detachably connected to the annular portion 351 via the connecting portion 54. The outer diameter of the annular portion 351 is slightly smaller than the inner diameter of the coil accommodating portion 531. A plurality of grooves 353 and 355 extending in the direction of extension of the central axes C2 and C3 are formed on the outer circumferential surface of the annular portion 351. Engaging pieces 541 (see FIG. 4) of the connecting portion 54 are disposed in the grooves 353, respectively. The claws 542 of the engaging pieces 541 engage with recesses formed on the surface of the annular portion 351 opposite the abutting surface in the direction of extension of the central axes C2 and C3. Engaging protrusions 546 are fitted into the grooves 355, respectively.

[0084] In this way, sensor unit 5 is connected to suction nozzle 35 by the engagement between groove 353, recess 354 and engagement piece 541, and the engagement between groove 355 and engagement protrusion 546. The user can attach and detach sensor unit 5 to and from suction nozzle 35 in the same manner as described in the first embodiment.

[0085] The arm portion 356 is a cylindrical portion connected to a part of the annular portion 351 and extends linearly radially outward from the annular portion 351. An opening at one end of the arm portion 356 communicates with the insertion opening 352, and air and dust flow into the suction nozzle 35 from this opening (hereinafter referred to as the suction port 357). The internal space of the arm portion 356 functions as a suction path 358 through which the air and dust sucked through the suction port 357 pass. The suction path 358 extends from the suction port 357 to the other end of the arm portion 356 (the end opposite the annular portion 351). The other end of the arm portion 356 is connected to the connecting pipe 31, and the suction path 358 communicates with the internal space of the connecting pipe 31.

[0086] The method of use and operation of the dust collection system 1B will be described below.

[0087] When drilling an object having metal buried therein (for example, a concrete wall or floor with rebar buried therein), the user attaches the dust collection attachment 3 with the sensor unit 5 attached to the dust collector 8. As described above, the user operates the wireless activation button 563 to pair the sensor unit 5 with the dust collector 8. With the power of the sensor unit 5 turned on, the user brings at least a portion of the contact surfaces of the coil accommodating portion 531 and the annular portion 351 into contact with the object to be drilled, and visually checks the indicator portion 57 to confirm the presence or absence of metal and its relative position.

[0088] When the user places the dust collecting attachment 3 in a desired position and presses the dust collector start button 565, the control unit 52 of the sensor unit 5 causes the wireless communication unit 55 to send a predetermined signal to the dust collector 8. When the controller 85 of the dust collector 8 recognizes this signal via the wireless unit 89, it starts driving the motor. As the fan rotates, air is sucked through the hose 83, and as described above, the base 33 of the dust collecting attachment 3 is attracted to and held on the surface of the object to be drilled. This allows the user to release the dust collecting attachment 3 and hold the drilling tool 7 to perform drilling work. When the user then presses the dust collector start button 565, wireless communication is established and the controller 85 of the dust collector 8 stops driving the motor.

[0089] As described above, in the dust collection system 1B of this embodiment, the dust collection attachment 3, which is attached to the dust collector 8 and used in drilling work, is equipped with a sensor 51 capable of detecting metal. Therefore, a user can use the dust collection attachment 3 to search for metal buried in the object to be drilled and place the suction nozzle 35 in an appropriate position. This improves work efficiency compared to operating a separate buried object detection device and then switching to the dust collection attachment 3 and placing the suction nozzle 35 in an appropriate position.

[0090] Furthermore, since the dust collection attachment 3 is detachable from the dust collector 8, which can operate independently of the drilling tool 7, the dust collection attachment 3 attached to the dust collector 8 can be used regardless of the type of drilling tool 7. Furthermore, since the dust collection attachment 3 (sensor unit 5) is equipped with a dust collector start button 565, the user can perform metal detection with the dust collection attachment 3 and also activate the dust collector 8 by pressing the dust collector start button 565. This further improves work efficiency.

[0091] The correspondence between each component (feature) of the above embodiment and each component (feature) of the present disclosure or invention is shown below. However, each component of the embodiment is merely an example and does not limit each component of the present disclosure or invention. Each of the suction nozzles 23, 35 (annular portions 231, 351) is an example of a "suction portion." The sensor unit 5 is an example of a "detection portion." The coil accommodating portion 531 is an example of an "annular portion." The power / reset button 561 is an example of a "first operation portion." The controller 78 (more specifically, the CPU) is an example of a "control device" of the drilling tool. The dust collector start button 565 is an example of a "second operation portion."

[0092] It should be noted that the above-described embodiments are merely examples, and the dust collection attachments according to the present disclosure are not limited to the illustrated dust collection attachments 2 and 3. For example, the following modifications can be made. Furthermore, at least one of these modifications can be adopted in combination with the dust collection attachments 2 and 3 illustrated in the embodiments and at least one of the features described in each claim.

[0093] The configuration of the dust collection attachment detachable from the drilling tool can be changed depending on the configuration of the drilling tool. For example, the dust collection attachment may include a dust collection motor and a dust collection fan. Furthermore, the dust collection attachment detachable from the dust collector that can operate separately from the drilling tool is not limited to a type that adheres to the surface of the workpiece using the suction force of the dust collector, but may be, for example, a type that is arranged around the tool tip attached to the drilling tool (a so-called dust collection cup). Furthermore, communication between the dust collection attachment and the drilling tool or the dust collector may be wired rather than wireless. For example, the dust collection attachment and the drilling tool or the dust collector may be configured to be electrically connected via a connector and an electric wire depending on the attachment of the dust collection attachment.

[0094] The shape of the sensor unit 5 and the manner of connection with the suction nozzles 23, 35 may be changed as appropriate. For example, if a sensor that does not require a detection coil is used, the housing 53 may not include an annular portion. The sensor unit 5 and the suction nozzles 23, 35 may be detachably connected by, for example, threaded engagement.

[0095] The power / reset button 561 of the operation unit 56 may be changed to two separate buttons. Also, for example, as in the dust collection attachment 3 of the second embodiment, if the usage method is such that the tip tool 91 does not affect metal detection, Power / Reset Button 561 The wireless start button 563 and the dust collector start button 565 may also be omitted as appropriate. Instead of push buttons, the operation unit 56 may employ, for example, a rotary dial, a touch screen, or the like.

[0096] The first indicator 571 and the second indicator 572 of the indicator unit 57 may each be configured as a single LED light or a display, for example. The first indicator 571 and the second indicator 572 may each be configured to display a numerical value corresponding to the distance, or may be configured so that the color of the LED light changes depending on the distance. Furthermore, the indicator unit 57 may be configured as a touch screen integrated with the operation unit 56, or may include a speaker that issues an audible alert.

[0097] Furthermore, in consideration of the spirit of the present invention and the above-described embodiments, the following aspects are established. Any one or more of the following aspects may be adopted in combination with the dust collection attachments 2 and 3 of the embodiments and their modifications, or the inventions described in the claims. [Aspect 1] the suction part has a contact surface that can contact the object to be drilled and an end that is located on the opposite side to the contact surface in a direction perpendicular to the contact surface, At least a portion of the sensor (for example, a portion of the detection coil or a reference point of the sensor) is between the contact surface and the end of the attraction portion in the direction perpendicular to the contact surface. [Aspect 2] The tip of the suction part is formed in an annular shape with the suction port at the center, The distance from the outer edge of the tip of the suction portion to the outer edge of the annular portion of the detection portion is smaller than the radius of a circle that defines the outer edge of the tip of the suction portion. [Aspect 3] The drilling tool includes a first communication unit, the dust collection attachment includes a second communication unit capable of communicating with the first communication unit, The control device of the drilling tool is configured to control the driving of the motor based on information regarding the distance between the metal and the sensor transmitted from the second communication unit. [Aspect 4] The dust collection attachment is configured so that the attachment position of the detection unit relative to the suction unit can be changed. [Explanation of symbols]

[0098] 1A, 1B: dust collection system, 2: dust collection attachment, 21: main body, 213: engagement portion, 215: cylindrical portion, 218: exhaust port, 22: dust box, 220: dust collection space, 221: filter, 223: filter holder, 23: suction nozzle, 230: tip portion, 231: annular portion, 232: insertion opening, 233: front surface, 234: cap, 236: arm portion, 237: suction port, 238: suction path, 24: connecting portion, 241: first protrusion, 242: engagement piece, 246: second protrusion, 26: slide portion, 27: hose, 3: dust collection attachment, 31 : connecting pipe, 33: base portion, 331: sealing member, 35: suction nozzle, 351: annular portion, 352: insertion opening, 353: groove, 354: recess, 355: groove, 356: arm portion, 357: suction port, 358: suction path, 5: sensor unit, 51: sensor, 510: substrate, 511: detection coil, 512: spool, 514: circuit portion, 52: control portion, 53: housing, 531: coil accommodating portion, 532: front surface, 535: circuit accommodating portion, 54: connecting portion, 541: engaging piece, 542: claw, 546: engaging protrusion, 55: wireless communication portion, 56: operation portion, 561: Power / Reset button , 563: Wireless start button, 565: Dust collector start button, 57: Indicator part, 571: First indicator, 572: Second indicator, 59: Battery, 7: Drilling tool, 71: Tool body, 711: Air intake, 713: Receiving part, 72: Tool holder, 73: Handle, 731: Grip part, 732: Trigger, 733: Switch, 735: Battery attachment part, 74: Motor, 741: Output shaft, 75: Fan, 77: Drive mechanism, 78: Controller, 79: Wireless unit, 8: Dust collector, 81: Main body, 83: Hose, 85: Controller, 89: Wireless unit, 91: Tip tool, 93: Battery.

Claims

1. A dust collection attachment for use with a drilling tool to suck up dust generated during drilling operations, comprising: a suction section including an insertion opening through which a tool bit removably held on the drilling tool can be inserted, and a suction port communicating with the insertion opening and through which the dust is sucked, the insertion opening having a diameter larger than the opening width of the suction port; a detection portion including a sensor configured to detect metal within a detection range; Equipped with The suction unit is A dust collection attachment in which the opening of the insertion opening facing the drilling tool has a diameter larger than the opening width of the suction port.

2. 2. The dust collection attachment according to claim 1, The dust collection attachment is characterized in that the sensor is disposed adjacent to the suction part.

3. 3. The dust collection attachment according to claim 1 or 2, the detection portion includes an annular portion disposed around the insertion opening, A dust collection attachment, wherein the detection portion is connected to the suction portion so that the center of the annular portion and the center of the insertion opening substantially coincide with each other.

4. The dust collection attachment according to any one of claims 1 to 3, The dust collection attachment, wherein the detection unit is detachable from the dust collection attachment.

5. The dust collection attachment according to any one of claims 1 to 4, The dust collection attachment further comprises a first operating portion configured to be manually operated by a user to reset the detection criteria of the sensor.

6. 6. The dust collecting attachment according to claim 1, 2, 4, or 5, A dust collection attachment characterized by comprising a cap that is removably attached to the annular portion in which the insertion opening is formed, covers the insertion opening, and has notches radially extending from an insertion hole formed in the center through which the tool bit passes.

7. The dust collection attachment according to any one of claims 1 to 6, A dust collection attachment that is detachable from the tool body of the drilling tool.

8. 1. A dust collection system comprising: a drilling tool including a motor, a control device configured to control driving of the motor, and a tool body that houses the motor and the control device; and the dust collection attachment according to any one of claims 1 to 6, which is removably attached to the tool body; the sensor is configured to measure a distance between the metal within the detection range and the sensor; The control device of the drilling tool is configured not to drive the motor when the distance between the metal and the sensor is shorter than a predetermined distance.

9. The dust collection attachment according to any one of claims 1 to 6, A dust collection attachment that is detachable from a dust collector that can operate independently of the drilling tool.

10. 10. The dust collection attachment according to claim 9, The dust collecting attachment further comprises a second operating part that is manually operated by a user to activate the dust collector.

Images