JP5788746B2 - Dust collector for power tool and power tool - Google Patents

Description

  The present invention relates to a dust collector for an electric tool that is attached to an electric tool such as an electric drill or a hammer drill, and an electric tool equipped with the dust collector.

  An electric power tool such as an electric drill or a hammer drill is equipped with a dust collecting device that collects and collects dust generated from a workpiece during a drilling operation or the like. In this dust collector, as disclosed in Patent Document 1, a tip tool attached to a power tool passes through the tip of an arm that forms a dust collection path, and a contact side with a work surface is a flexible material such as rubber. It has a cylindrical suction port made of a functional material. By pressing this suction port against the workpiece and performing a drilling operation or the like, dust generated from the workpiece can be sucked together with the outside air from the suction port and captured by a filter provided inside.

German Patent Application No. 102006039969

  In the dust collector of Patent Document 1, when the suction port is inclined with respect to the surface to be processed by, for example, tilting the electric tool, the gap between the surface to be processed and the suction port is increased, and the suction force is reduced. End up. However, if the flexibility of the suction port is increased, the space between the work surface is sealed, the amount of outside air sucked is reduced, the air flow is deteriorated, and the dust collection efficiency is eventually lowered.

  Therefore, the present invention provides a dust collector for an electric tool and an electric tool that can maintain the flow of air without reducing the suction force even when the inlet port is tilted and can obtain a suitable dust collection efficiency. It is intended to provide.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a cylindrical suction port through which a tip tool of an electric power tool can pass through a casing that can be attached to the electric power tool is brought into contact with a work surface. While projecting with the axis line in the front-rear direction and the peripheral surface connected to the casing side, a dust collection path is formed in the casing to suck air from the suction port and lead it into the casing. A dust collector for an electric power tool capable of capturing dust sucked together with air by a provided filter , wherein the front end of the suction port is tapered toward the front, and the front end is smaller than the opening on the front side of the suction port. comprising a becomes narrowed portion on the inner periphery, the diaphragm portion is the surface to be processed and abutting elastically deformed, providing a closed ring which closes the space between the suction port and the processing surface, the diaphragm portion, before and after the elastic deformation Regardless of the air flow to the inlet It is characterized in that the formation of the vent portion for holding.
According to a second aspect of the invention, in the configuration of claim 1, the vent is formed to the inner peripheral edge of the diaphragm portion to the radial direction of the narrowed portion as start, the inner peripheral edge of the width is V-shaped narrowing with distance It is characterized by being a slit.
According to a third aspect of the present invention, in the configuration of the first or second aspect, the rear surface of the suction port is an inclined surface whose length in the axial direction becomes shorter as the distance from the connection portion with the casing side increases. Is.
According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, the ventilation portion is provided so as to avoid a position directly below the center of the suction port.
According to a fifth aspect of the present invention, in the configuration of any one of the first to fourth aspects, the closing ring is detachably provided. .
In order to achieve the above object, the invention described in claim 6 is an electric tool, and is provided with the dust collecting device for an electric tool according to any one of claims 1 to 5. Is.

According to invention of Claim 1 and 6, even if a suction port may incline by adoption of the obstruction | occlusion ring provided with the ventilation | gas_flowing part in the aperture | diaphragm | squeeze part, the flow of air is not reduced. Can be maintained, and a suitable dust collection efficiency can be obtained.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the ventilation portion is a V-shaped slit, which is suitable for maintaining the air flow while ensuring the elastic deformation of the throttle portion. A ventilation part is obtained.
According to the third aspect of the present invention, in addition to the effect of the first or second aspect, the formation of the inclined surface prevents the stagnation of air in the suction port and ensures a smooth air flow.
According to the fourth aspect of the present invention, in addition to the effect of any one of the first to third aspects, the possibility of dust spilling to the outside through the ventilation portion is reduced.
According to the fifth aspect of the present invention, in addition to the effect of any one of the first to fourth aspects, since the closing ring is detachably provided, the replacement when it is deteriorated or damaged can be easily performed.

It is a side view of the hammer drill equipped with the dust collector for electric tools. It is a longitudinal cross-sectional view of the hammer drill equipped with the dust collector for electric tools. It is a perspective view of the dust collector for electric tools. It is a front view of a suction inlet, (A) shows before elastic deformation, (B) shows the time of elastic deformation, respectively. It is a front view of the suction inlet of the example of a change. It is a front view of the suction inlet of the example of a change.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view in which a dust collector for an electric tool (hereinafter simply referred to as “dust collector”) is mounted on a hammer drill which is an example of an electric tool, and FIG. 2 shows a longitudinal section thereof.
First, the hammer drill 1 accommodates the motor 3 and the output shaft 4 facing upward on the front side of the housing 2 in which a pair of left and right halved housings are assembled (the left side in FIGS. 1 and 2 is the front). The intermediate shaft 6 to which torque is transmitted via the bevel gears 5 and 5 is provided with a first gear 7, a clutch 8, and a boss sleeve 9 from the front. Above the intermediate shaft 6, a tool holder 11 into which a bit 10 as a tip tool can be inserted at the tip is pivotally supported in parallel with the intermediate shaft 6, and is attached to the rear end of the piston cylinder 12 loosely inserted behind the tool holder 11. The arm 13 is connected to the boss sleeve 9 via a swash bearing. Inside the piston cylinder 12, a striker 15 is externally movably mounted via an air chamber 14, and an impact bolt 16 provided in front of the striker 15 can be struck. The first gear 7 meshes with the second gear 17 attached to the tool holder 11.

On the other hand, a handle 18 having a switch 19 and a switch lever 20 is formed on the upper rear side of the housing 2, and a battery pack 21 serving as a power source is mounted below the handle 18. In addition, the front lower portion of the housing 2 is a mounting portion 22 to which the dust collector 30 is mounted, with the front surface inclined downward and protruding forward of the battery pack 21. A controller 23 that is electrically connected to the coil of the motor 3, the switch 19, and the battery pack 21 is accommodated in the mounting portion 22.
In addition, a connector 24 in which three female terminals for power supply and communication are juxtaposed in the left-right direction is provided on the upper front side of the controller 23, and a rectangular shape is provided in front of the connector 24 on the front surface of the mounting portion 22. An insertion port 25 is formed as an opening.

  The dust collecting device 30 has an L-shaped casing 31 that is obtained by assembling left and right half casings, and a fitting recess 32 that fits the mounting portion 22 of the hammer drill 1 is formed in the upper right portion. Yes. A motor 33 with the output shaft 34 facing forward is accommodated laterally behind the casing 31, and a controller 35 is provided behind the motor 33. A dust collecting fan 36 is fixed to the output shaft 34 and is defined in the casing 31 and accommodated in an intake chamber 37 having an exhaust port (not shown) on the side surface. 38 is a joint portion of the dust box formed in the casing 31 in front of the intake chamber 37, and has a concave shape opened only in the front as shown in FIG. A communication hole 40 that allows the coupling portion 38 to communicate with the intake chamber 37 is formed coaxially with the dust collection fan 36.

Further, on the upper rear surface of the casing 31, three plate-like male terminals 41, 41... For power supply and communication are arranged in parallel in the left-right direction and project rearward.
Further, a pair of guide rails 42, 42 are erected in the front-rear direction on the left and right sides of the rear portion of the casing 31 at intervals at which the lower portion of the mounting portion 22 can be fitted.

Above the connecting portion 38, a guide passage 43 is formed in the front-rear direction that opens at the front end and turns at the rear end in a U-shape and goes around the connecting portion 38. An L-shaped nozzle 44 whose tip is upward is connected to the front end of the guide passage 43 in a state in which it can expand and contract in the front-rear direction and is urged to protrude forward. A suction port 45 is formed at the tip of the nozzle 44.
The suction port 45 has a cylindrical shape in which the bit 10 can penetrate coaxially with the axis line in the front-rear direction, and the lower peripheral surface communicates with the nozzle 44. On the rear surface of the suction port 45, an inclined surface 46 whose axial length becomes shorter as it goes away from the connection portion with the nozzle 44 is formed, and the rear side is opened obliquely rearward. A rubber cap 47 having a through hole 48 on the axis of the bit 10 and having a plurality of cuts 49, 49... Communicating radially from the through hole 48 is fitted into the rear opening. The bit 10 can be penetrated in a state where the side opening is substantially closed.

  A rubber closing ring 50 is detachably fitted in the opening on the front side of the suction port 45. On the inner periphery of the closing ring 50, a constricted portion 51 is formed that tapers forward and has a front end that is smaller than the opening on the front side of the suction port 45. As shown in FIGS. 3 and 4 (A), the throttle 51 includes slits 53, 53,... Serving as vents communicating in the radial direction from the opening 52 at four locations at equal intervals in the circumferential direction. Are formed to divide the throttle 51 into four elastic pieces 54, 54. Each of the slits 53 is formed so as to avoid a position directly below the center of the opening 52 in front view, and is formed in pairs on inclined straight lines orthogonal to each other.

  In addition, each slit 53 is formed in a V shape having the widest communication portion with the opening 52 and gradually narrowing from there to the outside, and the outermost portion (tip portion) of each slit 53 is It is formed in a semicircular shape instead of a pointed shape. Thereby, even if each elastic piece 54 is elastically deformed to the front opening of the suction port 45, as shown by a two-dot chain line in FIG. 4B, the elastic pieces 54 and 54 adjacent to each other across the slit 53 are mutually connected. The slit 53 does not close due to contact, and the slit 53 remains in a state where the width is narrowed.

On the other hand, a flexible hose 55 is accommodated across the nozzle 44 and the guide passage 43, and a tube folded back in a U shape along the rear end shape of the guide passage 43 at the rear end of the flexible hose 55. Shaped ducts 56 are connected. The front end portion of the duct 56 penetrates the partition wall 39 and protrudes into the coupling portion 38.
57 is a dust box that is detachably attached to the coupling portion 38, and includes a rectangular parallelepiped box body 58 and a lid body 59 that is hinged to the opening of the box body 58. An inlet 60 is formed on the upper side and an outlet 61 is formed on the lower side, and a filter unit 62 having a folded paper filter is provided at a position covering the outlet 61.

In the hammer drill 1 and the dust collector 30 configured as described above, when the dust collector 30 is attached to the hammer drill 1, the guide rail of the casing 31 is attached to the lower portion of the attachment portion 22 of the hammer drill 1. In a state where the portion 22 is positioned on the rear portion of the casing 31, the dust collecting device 30 is slid rearward so that the fitting recess 32 is fitted to the mounting portion 22 from the front. Then, both lower sides of the mounting portion 22 are coupled to the guide rails 42, 42, and the male terminal 41 of the dust collector 30 enters the housing 2 through the insertion port 25 and is electrically connected to the connector 24 ( FIG. 1).
After the dust collector 30 is mounted in this way, when the hammer drill 1 is gripped and the suction port 45 is pressed against the work surface and set, the opening 52 of the closing ring 50 in contact with the work surface is closed, and the elastic piece Each of 54 is elastically deformed rearward. However, as shown in FIG. 4B, since each slit 53 is not closed, ventilation between the narrowed portion 51 and the outside thereof is ensured.

  When the switch lever 20 of the hammer drill 1 is pushed in and the switch 19 is turned on, the motor 3 is driven to rotate the intermediate shaft 6. At this time, the clutch 8 is slid by operating the switch knob 26 provided on the side surface of the housing 2, and the forward position where only the first gear 7 is engaged, the reverse position where only the boss sleeve 9 is engaged, the first By selecting one of the intermediate positions that engage simultaneously with the gear 7 and the boss sleeve 9, the tool holder 11 rotates via the second gear 17 to rotate the bit 10, and the arm 13 swings. It is possible to select a hammer mode in which the piston cylinder 12 is reciprocated and the bit 10 is struck by the interlock striker 15 via the impact bolt 16 and a hammer drill mode in which the rotation of the tool holder 11 and the impact bolt 16 are simultaneously struck. Become. When the hammer drill 1 is advanced with the suction port 45 set, the nozzle 44 contracts to advance the hammer drill 1, and the bit 10 penetrates the suction port 45 to allow the workpiece to be processed.

  Further, when the switch 19 is turned on, the controller 23 supplies power to the controller 35 of the dust collector 30. Therefore, the controller 35 drives the motor 33 to rotate the dust collection fan 36. Thus, outside air is sucked through the slits 53 of the closing ring 50 at the suction port 45, and is discharged into the dust box 57 through the flexible hose 55 and the duct 56. Thereafter, it passes through the filter unit 62, reaches the intake chamber 37 from the outlet 61 through the communication hole 40, and is discharged to the outside from an exhaust port provided in the intake chamber 37. Accordingly, dust generated from the workpiece is sucked into the suction port 45 and enters the dust box 57 via the nozzle 44, the flexible hose 55, and the duct 56, is captured by the filter unit 62, and is stored in the box body 58. Will do.

At this time, since the upper portion of the suction port 45 is narrowed back and forth by the rear inclined surface 46, the sucked air does not stay inside the suction port 45 and flows smoothly toward the nozzle 44.
Further, even if the hammer drill 1 and the dust collector 30 may be tilted during the operation, the elastic pieces 54 of the closing ring 50 are elastically deformed following the suction holes 45, so that the opening 52 is closed. While being maintained, the flow of outside air through the slit 53 is ensured.

On the other hand, when the push of the switch lever 20 is released and the switch 19 is turned OFF, the motor 3 is stopped and the rotation of the bit 10 is stopped. However, since the controller 23 has a delay function for stopping energization of the dust collector 30 by delaying the switch 19 for several seconds after the switch 19 is turned off, the dust collector 30 rotates for several seconds after the bit is stopped in the dust collector 30. Continue. Therefore, dust remaining on the nozzle 44, the flexible hose 55, and the like can be reliably collected in the dust box 57.
The dust collector 30 is removed by sliding the dust collector 30 forward from the hammer drill 1 in reverse to the mounting state, and the fitting recess 32 is detached from the mounting portion 22 and the male terminal 41 is separated from the connector 24. Then, it is extracted from the insertion port 25.

  Thus, according to the dust collector 30 and the hammer drill 1 of the said form, it contacts with a to-be-processed surface at the front surface of the suction inlet 45, elastically deforms, and obstruct | occludes between the suction inlet 45 and a to-be-processed surface. In addition to providing the closing ring 50 and forming a ventilation part (slit 53) in the closing ring 50 for ensuring the air flow to the suction port 45 regardless of before and after elastic deformation, the suction port 45 may be inclined. Even if there is, the flow of air can be maintained without reducing the suction force, and a suitable dust collection efficiency can be obtained.

In particular, here, the ventilation portion is formed as a V-shaped slit 53 that is formed in the radial direction of the closing ring 50 starting from the inner peripheral edge of the closing ring 50, and becomes narrower as the distance from the inner peripheral edge increases. Thus, it is possible to obtain a suitable ventilation portion that maintains the air flow while securing the elastic deformation.
In addition, the rear surface of the suction port 45 is an inclined surface 46 whose axial length becomes shorter as the distance from the connection portion with the casing 31 is increased, thereby preventing air from staying in the suction port 45 and smoothing. Air flow can be secured.
Furthermore, since the slit 53 is provided so as to avoid the position directly below the center of the suction port 45, the possibility of dust spilling outside through the slit 53 is reduced.
In addition, since the closing ring 50 is detachably provided, it can be easily replaced when it is deteriorated or damaged.

In the above embodiment, a V-shaped slit is adopted as the ventilation portion. However, even if the base end of the slit is not a semicircular shape but a flat portion, ventilation by the slit when the elastic piece is retracted is ensured. . Further, even when the base end has a pointed shape, by forming the edges of the elastic pieces on both sides in a concave curve shape, it is possible to ensure ventilation when the elastic pieces are retracted.
Further, not limited to the slit, for example, a closing ring 50A shown in FIG. 5 is provided with a plurality of through holes 63, 63,. You may drill. Also in this case, even if the throttle 51 is elastically deformed, the through hole 63 is not closed, so that the flow of outside air through the through hole 63 is ensured. Further, like the closing ring 50B shown in FIG. 6, a plurality of notches 64, 64,... Are provided at predetermined intervals in the circumferential direction as ventilation portions on the inner edge of the opening 52 of the throttle portion 51 that is not divided in the circumferential direction. Forming is also conceivable. Also in this case, the notch 64 is not closed even if the throttle part 51 is elastically deformed, so that the flow of outside air through the notch 64 is ensured.

In addition to the change in the arrangement of the motor and battery pack, the hammer drill also has a connector that can be slid between the connection position and the non-connection position in the vertical or horizontal direction instead of rotating, such as a coil spring or a leaf spring. The urging means can be urged to the non-connection position. As for the power supply to the dust collector, the relationship between the male terminal and the female terminal is reversed, or instead of inserting the terminal, a terminal part that abuts on the coupling part of the mounting part and the fitting recess is provided. It can be changed as appropriate. Of course, the closing ring of the present invention can be adopted not only in the dust collector provided with a motor and a dust collecting fan but also in a form in which only a filter is provided and suction force is obtained from a fan provided in an electric tool. .
The power tool is not limited to a hammer drill, and the present invention can be applied to other models such as an electric drill as long as such a dust collector can be mounted.

  1 .. Hammer drill, 2 .. Housing, 3, 33 .. Motor, 4, 34 .. Output shaft, 6 .. Intermediate shaft, 10 .. Bit, 11 .. Tool holder, 21. ..Mounting part, 23, 35..Controller, 30..Dust collector for electric tool, 31..Case, 32..Fitting recess, 36..Dust collector fan, 37..Intake chamber, 38 .. Connection part, 40 ... Communication hole, 44 ... Nozzle, 45 ... Suction port, 46 ... Inclined surface, 50, 50A, 50B ... Closing ring, 51 ... Restriction part, 52 ... Opening, 53 ... Slit, 54 ... Elastic piece, 55 ... Flexible hose, 57 ... Dust box, 62 ... Filter unit, 63 ... Through hole, 64 ... Notch.

Claims (6)

Connected to the casing that can be attached to the power tool, a cylindrical suction port that can contact the work surface and allow the tip tool of the power tool to pass through, with the axis line in the front-rear direction and the peripheral surface connected to the casing side On the other hand, in the casing, a dust collection path is formed that sucks air from the suction port and guides it into the casing, and dust sucked together with the air by a filter provided on the dust collection path. A dust collector for an electric tool that can be captured,
A front surface of the suction port is tapered toward the front, and a front end is smaller than an opening on the front side of the suction port. A deformation ring is provided to provide a closing ring that closes the space between the suction port and the surface to be processed, and a ventilation portion is provided in the throttle portion to ensure the flow of air to the suction port regardless of before and after the elastic deformation. A dust collector for an electric tool characterized by being formed. The vent, the inner peripheral edge of the narrowed portion formed in radial direction of the narrowed portion as starting, to claim 1, characterized in that a V-shaped slit whose width becomes narrower as the distance from the inner peripheral edge The dust collector for electric tools as described.   3. The dust collecting apparatus for an electric tool according to claim 1, wherein a rear surface of the suction port is an inclined surface whose length in the axial direction becomes shorter as the distance from the connection portion with the casing side increases.   The dust collecting apparatus for an electric tool according to any one of claims 1 to 3, wherein the ventilation portion is provided so as to avoid a position directly below the center of the suction port.   The dust collecting apparatus for an electric tool according to any one of claims 1 to 4, wherein the closing ring is detachably provided.   A power tool comprising the power tool dust collector according to any one of claims 1 to 5.

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