JP2020104218A - Dust collection system for power tool - Google Patents

Abstract

To make usability excellent by selectively making different types of dust collection attachments usable.SOLUTION: A dust collection system S1 for a power tool includes: a hammer drill 1 in which a bit B is mounted; a first dust collection attachment 40A which has an only dust collection route R1 including a suction port 56 for the bit B; and a second dust collection attachment which has a dust collection route including a suction port 56 for the bit B and a dust box which is provided on the dust collection route and stores powder dust sucked from the suction port 56. The first dust collection attachment 40A and the second dust collection attachment have common mounting sections 48 which can be respectively mounted in a housing 2 of the hammer drill 1. The first duct collection attachment 40A and the second dust collection attachment can be selected and mounted with respect to the hammer drill 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dust collection system for an electric tool used for collecting dust generated when an electric tool such as a hammer drill is used.

When processing a work material such as concrete or stone using an electric tool such as a hammer drill, a collection of power tools as disclosed in Patent Documents 1 and 2 is provided so that dust generated from the work is not scattered. A dust system is used. Here, a dust collection attachment in which a bit of an electric tool penetrates or opens in the vicinity of the bit is projected forward is attached to an electric tool such as a hammer drill, and the dust collection attachment is connected to an external dust collector through a hose. The structure is disclosed in which the dust is sucked from the nozzle by the suction force generated by driving the dust collector and the dust is collected by the dust collector.

Japanese Utility Model Publication No. 6-32248 Chinese Patent Application Publication No. 10356790

In the above-mentioned conventional dust collection system for electric tools, it is necessary to always prepare and connect a dust collector in addition to the dust collection attachment. There is also a dust collection attachment equipped with a dust box with a filter, but since the mounting style for power tools is different, the housing of the power tool has only a structure for mounting one type of dust collection attachment. I have only been able to do so.

Therefore, an object of the present invention is to provide a dust collecting system for an electric power tool, in which dust collecting attachments of different types can be selectively used and which is easy to use.

In order to achieve the above object, the invention described in claim 1 is a power tool to which a bit is attached, a first dust collecting attachment including only a dust collecting path including a suction portion for the bit, and a suction for the bit. A first dust collection attachment including a dust collection path including a portion and a second dust collection attachment provided on the dust collection path and storing a dust sucked from the suction portion. The attachment and the second dust collecting attachment each have a common attachment part that can be attached to the housing of the power tool, and the first dust collecting attachment and the second dust collecting attachment are selected for the power tool. It is characterized by being attachable.
According to a second aspect of the invention, in the configuration of the first aspect, the power tool includes a dust collecting fan in the housing, and the housing is provided with an air suction port for the dust collecting fan. Is characterized by.
According to a third aspect of the invention, in the configuration of the second aspect, the suction port of the housing is closed when the first dust collecting attachment is attached to the electric power tool.
According to a fourth aspect of the present invention, in the configuration of the first aspect, the electric tool does not include a dust collecting fan in the housing, and the second dust collecting attachment includes a dust collecting fan and a dust collecting fan. A motor for rotating a fan for dust collection and a dust box serving as a dust collecting portion are provided, and the second dust collecting attachment can be supplied with power from the electric tool in a state of being attached to the electric tool. Is characterized by.
According to a fifth aspect of the present invention, in the structure according to any one of the first to fourth aspects, the output shaft of the motor and the final output shaft on which the bit is mounted are arranged in parallel in the electric power tool. And
According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the first dust collecting attachment and the second dust collecting attachment are attachable to and detachable from the housing by sliding the final output shaft in the axial direction. And
According to a seventh aspect of the present invention, in the configuration according to any one of the first to sixth aspects, the output portion for driving the bit is housed in the front portion of the housing, and the attached portion to which the attachment portion is coupled is the front portion. It is provided in.

According to the invention described in claim 1, the first dust collecting attachment and the second dust collecting attachment of different types are provided with common mounting portions that can be respectively mounted in the housing of the electric power tool, and thus the electric power tool is provided. On the other hand, since the first dust collecting attachment and the second dust collecting attachment can be selected and attached, it is possible to selectively use two different dust collecting attachments with one electric tool. Therefore, it is possible to properly use the dust collecting system according to the type of the electric tool, the working environment, etc., and the usability is improved.
According to the invention described in claim 2, in addition to the effect of claim 1, since the electric tool includes the dust collecting fan and the air suction port in the housing, the power collecting tool using the dust collecting fan is provided. Easy to dust.
According to the invention described in claim 3, in addition to the effect of claim 2, when the first dust collecting attachment is attached to the electric tool, the suction port of the housing is closed, so that the self-dust collecting function is provided. Even with the above electric tool, the first dust collecting attachment including only the dust collecting path can be used without any trouble.
According to the invention of claim 4, in addition to the effect of claim 1, the electric tool does not have a dust collecting fan in the housing, and the second dust collecting attachment has a dust collecting fan. And a dust collecting motor for rotating the dust collecting fan and a dust box are provided, and since the second dust collecting attachment is attached to the electric tool, power can be supplied from the electric tool. Even if a dust collector is not used, the power of the electric tool can be used to perform self-dust collection by the dust collection attachment.
According to the invention of claim 5, in addition to the effect of any one of claims 1 to 4, in the electric tool, the output shaft of the motor and the final output shaft on which the bit is mounted are arranged in parallel. Therefore, the entire structure extends in the front-rear direction, and it becomes easy to attach the two dust collecting attachments to the housing.
According to the invention described in claim 6, in addition to the effect of claim 5, the first dust collecting attachment and the second dust collecting attachment can be attached to and detached from the housing by sliding in the axial direction of the final output shaft. Therefore, the first and second dust collecting attachments can be easily attached to and detached from the electric tool.
According to the invention of claim 7, in addition to the effect of any one of claims 1 to 6, an attached portion in which an output portion for driving a bit is housed in the front portion of the housing and the attaching portion is joined Is provided on the front side portion, the attached portion can be easily visually recognized when the first and second dust collecting attachments are attached, and the attaching operation can be easily performed. In addition, the overall balance after mounting is also good.

It is a center longitudinal cross-sectional view of the dust collection system for electric tools which attached the 1st dust collection attachment to the hammer drill which does not have a self-dust collection function. It is a side view of the 1st dust collection attachment. FIG. 3 is an enlarged sectional view taken along the line AA of FIG. 2 (the slide cylinder is in a retracted state). It is a BB line expanded sectional view of FIG. FIG. 2 is an enlarged cross-sectional view taken along the line CC of FIG. 1 (the slide cylinder is in a retracted state). It is a lateral expansion sectional view of a joint part of a hammer drill and the 1st dust collection attachment (slide cylinder is in a retreat state). It is a center longitudinal cross-sectional view of the dust collection system for electric tools which attached the 2nd dust collection attachment to the hammer drill which does not have a self-dust collection function. It is a center longitudinal cross-sectional view of the dust collection system for electric tools which attached the 1st dust collection attachment to the hammer drill provided with the self-dusting function. It is a center longitudinal cross-sectional view of the dust collection system for electric tools which attached the 2nd dust collection attachment to the hammer drill provided with the self-dust collection function. It is a side view of the 2nd dust collection attachment. It is a lateral expansion sectional view of the connection part of a hammer drill and the 2nd dust collecting attachment (slide cylinder is in a retreat state).

Embodiments of the present invention will be described below with reference to the drawings.
[Form 1]
In FIG. 1, a first dust collection attachment 40A is attached to a hammer drill 1 that does not have a self dust collection function (a dust collection fan is not provided), and a dust collection system for power tools (hereinafter referred to as "dust collection system") S1. FIG. 6 is a central vertical cross-sectional view showing an example in which the
(Explanation of hammer drill)
The housing 2 of the hammer drill 1 is a tubular motor housing 3 that houses the motor 4 with the output shaft 5 facing forward and backward, and a tubular body housing that is connected to the front of the motor housing 3 and that houses the output portion 7. 6, a handle housing 8 which is assembled to the motor housing 3 from the rear side and which includes a switch lever 9 on the front side to accommodate a switch (not shown), and a front housing 10 which is connected to the front side of the main body housing 6 and holds the tool holder 11. Is formed of. A power cord 12 is connected to the lower end of the handle housing 8.

The output shaft 5 of the motor 4 penetrates through the inner housing 13 held in the main body housing 6 and projects into the main body housing 6, and a pinion 14 is formed at the front end. Behind the pinion 14, the output shaft 5 is provided with a motor cooling fan 15 located in the motor housing 3. An intake port (not shown) for intake of cooling air for the motor 4 is formed on the side surface of the motor housing 3, and an exhaust port 16 is formed on the lower surface of the motor housing 3 below the motor cooling fan 15.

In the output portion 7, an intermediate shaft 19 to which torque is transmitted via a gear 18 that meshes with the pinion 14 of the output shaft 5 is supported in the front-rear direction in the main body housing 6, and the intermediate shaft 19 has a first position from the front side. A gear 20, two clutches 21 and 21, and a boss sleeve 22 are provided. Above the intermediate shaft 19, a tool holder 11 into which the bit B can be attached at its tip is axially supported parallel to the intermediate shaft 19, and a piston cylinder 23 is loosely inserted behind the tool holder 11. An arm 25 is mounted on the boss sleeve 22 via a swash bearing 24 having an inclined axis, and the upper end of the arm 25 is connected to the rear end of the piston cylinder 23. A striker 27 is housed inside the piston cylinder 23 via an air chamber 26 so as to be movable back and forth, and an impact bolt 28 provided in front of the striker 27 can be hit. The first gear 20 meshes with the second gear 29 mounted on the tool holder 11. The tool holder 11 projects forward from the front housing 10, and an operation sleeve 30 for attaching and detaching the bit B is provided at the front end.

Further, a switching knob 31 is provided on a side surface of the main body housing 6, and by rotating the switching knob 31, the two clutches 21 and 21 are slid, and only the front clutch 21 has the first gear. 20, a position where only the rear clutch 21 is engaged with the boss sleeve 22, and a position where the front and rear clutches 21 and 21 are simultaneously engaged with the first gear 20 and the boss sleeve 22 are selectable. There is. Thereby, the tool holder 11 rotates via the second gear 29 to rotate the bit B, the piston cylinder 23 reciprocates by the swing of the arm 25, and the striker 27 interlocks with the impact bolt 28. A hammer mode for hitting the bit B and a hammer drill mode for simultaneously rotating the tool holder 11 and hitting the impact bolt 28 can be selected.
On the other hand, as shown in FIG. 6, a pair of guide grooves 32 are formed in the front-rear direction at the lower part of the main body housing 6 in the front-rear direction. A locking recess 33 that is recessed is formed. The guide groove 32 and the locking recess 33 constitute the mounted portion 34 of the first and second dust collecting attachments 40A and 40B.

(Explanation of the first dust collection attachment)
As shown in FIG. 2, the first dust collecting attachment 40A (hereinafter referred to as "attachment 40A") includes a hollow main body cylinder 41 extending in the front-rear direction, and a slide cylinder coaxially inserted into the main body cylinder 41 from the front. 42 and. As shown in FIG. 3, the main body cylinder 41 has a flat cross-sectional shape in which the horizontal dimension is larger than the vertical dimension, and the upper surface thereof has a main body housing 6 of the hammer drill 1 as shown in FIG. A pair of rail plates 43, 43 abutting from the left and right outside are erected in the front-rear direction on the lower part of the. Rails 44 that fit into the guide grooves 32 are provided on the upper portions of the inner surfaces of the rail plates 43 that face each other.
An operation button 45 having a hook 46 engageable with the locking recess 33 of the hammer drill 1 at the rear end thereof is provided at the front center of the rail plate 43 in the left-right direction. The operation button 45 is biased by a coil spring 47 provided on the lower side to an upper limit posture in which the hook 46 projects upward. The operation button 45 and the rail plate 43 form a mounting portion 48 to the hammer drill 1.

Further, as shown in FIG. 4, a rear stopper 54 that engages with a slide rail 52 provided on a side surface of the slide cylinder 42 is pushed into the front left side surface of the main body cylinder 41 to release the engagement with the slide rail 52. A release button 49 is provided to allow the release. On the other hand, a cylinder portion 50 that opens downward is formed on the lower surface of the rear portion of the main body cylinder 41, and an inner cylinder 51 is held in the rear portion of the main body cylinder 41 as shown in FIG. The rear end of the inner cylinder 51 is bent downward and fitted into the cylinder portion 50.

The slide cylinder 42 has a flat cross-sectional shape that is loosely inserted into the main body cylinder 41 and fits in a rotation stop state, and a slide rail 52 is provided on the left side surface in the front-rear direction. A front stopper 53 located in front of the main body cylinder 41 and a rear stopper 54 located inside the main body cylinder 41 are provided on the slide rail 52 so that they can be positioned at arbitrary front and rear positions.
Further, an L-shaped nozzle 55 having a tip facing upward is connected to the front end of the slide cylinder 42, and a cylinder-shaped suction port 56 through which the bit B coaxially penetrates is formed at the tip of the nozzle 55. ..
A bellows-shaped flexible hose 57 whose front end is connected to the lower end of the nozzle 55 in the slide cylinder 42 and whose rear end is connected to the front end of the inner cylinder 51 in the main body cylinder 41 is housed inside the attachment 40A. ing. The flexible hose 57 has a coiled wire integrally inside and is biased in the extension direction, and biases the slide cylinder 42 from the main body cylinder 41 forward. Therefore, the projection of the slide cylinder 42 is restricted at the position where the rear stopper 54 is locked in the main body cylinder 41. Here, the release button 49 is pressed to engage the rear stopper 54 and the slide rail 52. When the stop is released, the slide cylinder 42 can be adjusted to an arbitrary protruding position. When the pressing of the release button 49 is released, the rear stopper 54 is again locked with the slide rail 52 and the protrusion is restricted.

(Explanation of the operation of the dust collecting system using the first dust collecting attachment)
In the dust collecting system S1 configured as described above, when the attachment 40A is attached to the hammer drill 1, the attachment portion 48 of the main body cylinder 41 is located in front of the attached portion 34 of the main body housing 6 of the hammer drill 1. Then, one of the rails 44 of the mounting portion 48 is slid in the front-rear direction so that the rail 44 of the mounting portion 48 fits into the guide groove 32 of the mounting portion 34. Then, as shown in FIGS. 1 and 6, the lower portion of the main body housing 6 is inserted between the rail plates 43, 43 so that the rail 44 is fitted into the guide groove 32, and the hook 46 of the operation button 45 is engaged with the recessed portion. The attachment portion 48 is coupled to the attachment portion 34 by being locked to the attachment portion 33. At this time, the suction port 56 of the slide cylinder 42 is located in front of the tool holder 11, and the bit B can penetrate therethrough.
When a dust collecting hose 58 (FIG. 1) connected to an external dust collector is inserted and connected to the lower end portion of the inner cylinder 51 that fits into the cylinder portion 50 of the main body cylinder 41, the suction port 56 causes the nozzle 55, A dust collecting path R1 is formed to reach the dust collecting hose 58 through the flexible hose 57 and the inner cylinder 51. The power cord 12 of the hammer drill 1 is connected to the dust collector together with the dust collecting hose 58, and the dust collector has the interlocking function of supplying power to the hammer drill 1 and operating itself together with the power supply.

Next, when the suction lever 56 of the attachment 40A is pressed against the surface of the workpiece to be set and the switch lever 9 of the hammer drill 1 is pushed in to turn on the switch, the motor 4 is driven and output. The shaft 5 rotates and the intermediate shaft 19 rotates. Then, according to the operation mode selected by the switching knob 31, the tool holder 11 rotates or rotates with the strike by the striker 27, and the bit B also rotates or rotates with the impact. When the hammer drill 1 is moved forward with the suction port 56 set, the slide cylinder 42 retracts together with the nozzle 55 as shown by the two-dot chain line in FIG. Can be processed. The backward movement of the slide cylinder 42 is restricted at a position where the front stopper 53 contacts the front end of the main body cylinder 41.

Then, when the dust collector operates in conjunction with the use of the hammer drill 1, the dust collection path R1 becomes a negative pressure, and the outside air is sucked from the suction port 56. The dust sucked together with the outside air passes through the dust collecting path R1 and is sucked into the dust collector through the dust collecting hose 58 to be collected.
To remove the attachment 40A, in a state where the operation button 45 is pushed in and the hook 46 is released from the engagement recess 33, one of the hammer drill 1 and the attachment 40A is removed from the other, contrary to the time of attachment. When the rail 44 is slid in the separating direction, the rail 44 is disengaged from the guide groove 32 and the removal is completed.

(Explanation of the second dust collection attachment)
A second dust collecting attachment 40B (hereinafter referred to as "attachment 40B") can also be attached to the hammer drill 1. Hereinafter, the attachment 40B will be described, but the same components as those of the attachment 40A will be denoted by the same reference numerals and redundant description will be omitted.
Like the attachment 40A, the attachment 40B shown in FIG. 7 is also provided with a mounting portion 48 including the rail plate 43 and the operation button 45 on the upper surface of the casing 60 extending in the front-rear direction, and the slide cylinder 42 protruding forward is also included. I have it. The difference is that it has a dust box 61 as a dust collecting part and a dust collecting motor 62 having a dust collecting fan 63, and the attachment 40B alone has a self dust collecting function.

First, a coupling portion 64 of the dust box 61 is provided in the lower portion of the casing 60, and a tubular elbow 65 having the rear end of the flexible hose 57 connected to one end is provided in the casing 60. The other end of the elbow 65 penetrates the lower plate 66 of the casing 60 and projects into the coupling portion 64.
The coupling portion 64 has a front wall 67 and a rear wall 68 that are formed downward from the lower plate 66, a rearward facing locking portion 69 is provided at the lower end of the front wall 67, and a left and right direction is provided at the lower end of the rear wall 68. Is provided with a support shaft 70.
The dust box 61 has a deep box-shaped box body 71 having an open top surface, and a lid body 72 whose rear end is hinged to the top surface of the box body 71 to open and close the opening of the box body 71. The lower surface of the box is provided with a filter accommodating portion 73 that projects into the box body 71 in a state where the box body 71 is closed. The filter accommodating portion 73 accommodates a paper filter 74 in a folded state.

Further, an inlet 75 into which the other end of the elbow 65 is inserted is formed in the front portion of the lid 72, and an outlet 76 is formed behind the inlet 75 and above the filter accommodating portion 73. A concave groove 77 that fits into the support shaft 70 of the rear wall 68 is formed in the left and right direction at the upper end of the rear surface of the box body 71, and the front end of the lid body 72 of the front wall 67 is accommodated in the coupling portion 64. An operation piece 78 that is elastically locked to the locking portion 69 is provided.
On the other hand, behind the elbow 65, the lower plate 66 of the casing 60 is provided with a sleeve 79 communicating with the outlet 76, and the region including the sleeve 79 is provided in the casing 60 with the front portion on the elbow 65 side for collecting dust. A fan accommodating chamber 80 is formed which is separated from the rear side portion which accommodates the motor 62. A dust collecting fan 63 fixed to the motor shaft of the dust collecting motor 62 is housed in the front end of the fan housing chamber 80 in a forward direction, and on the left and right side surfaces of the casing 60 outside the dust collecting fan 63, An exhaust port (not shown) is formed. A terminal 81, which is inserted and connected to a terminal receiver 35 provided on the lower surface of the housing 2 of the hammer drill 1, is projectingly provided at a rear portion of the casing 60. A power supply of 62 is available.

(Explanation of the operation of the dust collecting system by the second dust collecting attachment)
In the dust collecting system S1 configured as described above, when the attachment 40B is attached to the hammer drill 1, the attachment 40B is attached to the guide groove 32 of the attached portion 34 of the body housing 6 of the hammer drill 1 in the same manner as the attachment 40A. When the rail 44 of the mounting portion 48 is fitted and slid, and the hook 46 of the operation button 45 is locked in the locking recess 33, the mounting portion 48 is coupled to the mounted portion 34 and the mounting is completed. Then, when the terminal 81 is inserted and connected to the terminal receiver 35, power can be supplied from the hammer drill 1.
In this state, the attachment 40B has a dust collecting path R2 that passes through the suction port 56, the nozzle 55, the flexible hose 57, the elbow 65, and the filter 74 of the dust box 61 in this order to reach the fan housing chamber 80.

Next, when the suction lever 56 of the attachment 40B is pressed against the surface of the workpiece to be set, the switch lever 9 of the hammer drill 1 is pushed in to turn on the switch, and the motor 4 is driven to output. The shaft 5 rotates and the intermediate shaft 19 rotates. Then, according to the operation mode selected by the switch knob 31, the bit B rotates or rotates together with the impact to enable processing of the workpiece.
Then, the dust collection motor 62 operates in association with the use of the hammer drill 1 and the dust collection fan 63 rotates, so that the dust collection route R2 becomes a negative pressure and the outside air is sucked from the suction port 56. The dust sucked together with the outside air passes from the nozzle 55 through the flexible hose 57, enters the elbow 65 into the dust box 61, is captured by the filter 74, and is stored in the dust box 61.

Also when detaching the attachment 40B, in the state in which the operation button 45 is pushed in and the hook 46 is released from the engagement recess 33, one of the hammer drill 1 and the attachment 40B is separated from the other, contrary to the time of attachment. When it is slid in the direction, the rail 44 is disengaged from the guide groove 32 and the removal is completed.
Further, when discarding the dust stored in the dust box 61, the operation piece 78 of the dust box 61 is pushed to release the engagement with the engagement portion 69 of the front wall 67, and the coupling portion around the support shaft 70 remains as it is. The dust box 61 can be detached from the coupling portion 64 by rotating the dust box 61 in the direction away from 64. Therefore, it is possible to open the lid 72 and discard the dust stored inside.

As described above, in the dust collection system S1 of the above-described mode 1, the attachment includes only the hammer drill 1 (electric power tool) to which the bit B is attached and the dust collection path R1 including the suction port 56 (suction portion) for the bit B. 40A (first dust collecting attachment), a dust collecting path R2 including the suction port 56 for the bit B, and a dust box 61 (collecting dust collected on the dust collecting path R2 for storing the dust sucked from the suction port 56). And an attachment 40B (second dust collecting attachment) having a dust part), and the attachment 40A and the attachment 40B are provided with a common attachment part 48 that can be attached to the housing 2 of the hammer drill 1, respectively. The attachment 40A and the attachment 40B can be selected and attached to the drill 1.
Therefore, two attachments 40A and 40B of different types can be selectively used with one hammer drill 1, and the dust collection system S1 can be selectively used according to the type of the hammer drill 1 and the working environment. Become.

Particularly, here, the hammer drill 1 does not have a dust collecting fan in the housing 2, and the attachment 40B has a dust collecting fan 63, a dust collecting motor 62 for rotating the dust collecting fan 63, and Since the attachment 40B is provided with a dust box 61 serving as a dust collecting portion, and the attachment 40B can be supplied with power from the hammer drill 1 in a state where the attachment 40B is attached to the hammer drill 1, it is possible to supply power to the hammer drill 1 without using a dust collector. It is possible to collect dust by the attachment 40B by utilizing.
Further, in the hammer drill 1, the output shaft 5 of the motor 4 and the tool holder 11 (final output shaft) to which the bit B is mounted are arranged in parallel, so that the entire structure extends in the front-back direction. It becomes easy to attach the two attachments 40A and 40B to the lower side.

Further, since the attachments 40A, 40B can be attached to and detached from the housing 2 by sliding the tool holder 11 in the axial direction, the attachments 40A, 40B can be easily attached to and detached from the hammer drill 1.
The main body housing 6 (front side portion) of the housing 2 accommodates the output portion 7 for driving the bit B, and the mounted portion 34 to which the mounting portion 48 is coupled is provided in the main body housing 6, so that the attachment is attached. When the 40A and 40B are attached, the attached portion 34 is easily visible, and the attaching operation can be easily performed. In addition, the overall balance after mounting is also good.

[Form 2]
In addition, in the said form 1, although the two attachments 40A and 40B are selectively used with respect to the hammer drill 1 which does not have a self-dust collection function, it has a dust collection fan and has a self-dust collection function. The present invention can also be applied to a hammer drill. The dust collecting system will be described below.
In the dust collection system S2 shown in FIG. 8, in the hammer drill 1A, the intermediate housing 36 is provided between the motor housing 3 and the main body housing 6, and the output shaft 5 is formed long. A dust collecting fan 37 is provided. A unit-side suction port 38 is formed on the lower surface of the intermediate housing 36. The rotation of the dust collection fan 37 sucks outside air from the unit-side suction port 38, and is provided on the side surface of the intermediate housing 36 (not shown). It can be discharged from the exhaust port.

On the other hand, the first attachment 40C (hereinafter referred to as "attachment 40C") attached to the hammer drill 1A has the same configuration as the attachment 40A of the first embodiment, and is attached to the upper surface of the main body cylinder 41 in the attached state on the machine side suction port 38. The only difference is that a circular convex portion 85 that abuts from below to close the suction port 38 on the main body side is formed.

Therefore, similarly to the first embodiment, the rail 44 of the attachment portion 48 of the attachment 40C is fitted into the guide groove 32 of the attachment portion 34 of the main body housing 6 of the hammer drill 1A to lock the hook 46 of the operation button 45. If it is locked to 33, the attachment portion 48 is joined to the attachment portion 34 and the attachment is completed. In this state, the circular convex portion 85 comes into contact with the main unit side suction port 38 to close the main unit side suction port 38.
When the switch lever 9 of the hammer drill 1A is pushed in to turn on the switch, the motor 4 is driven to rotate the output shaft 5 and the motor cooling fan 15 and the dust collecting fan 37 rotate. Since the main unit side suction port 38 is closed by the circular convex portion 85, outside air and dust are not sucked in. Therefore, the dust generated from the material to be processed is sucked together with the outside air from the suction port 56, passes through the dust collecting route R1, and is collected from the dust collecting hose 58 to the external dust collector. The attachment 40C can be removed in the same manner as in the first embodiment.

On the other hand, in the second attachment 40D shown in FIGS. 9 and 10 (hereinafter referred to as “attachment 40D”), the dust box 61 is provided in the same manner as the attachment 40B of the first embodiment, but here, the dust is collected in the casing 60. A motor, a dust collecting fan, and a terminal are not provided, and a suction path 90 that connects the outlet 76 and the main unit side suction port 38 is provided inside the casing 60 behind the elbow 65.
The suction passage 90 has a lower cylinder 91 penetrating the lower plate 66 and having a lower end abutting the outlet 76, an upper cylinder 93 penetrating the upper plate 92 of the casing 60 and having an upper end protruding, and a lower cylinder 91. And a rear flexible hose 94 for connecting the upper cylinder 93 and the upper cylinder 93.
As a result, in the attachment 40D, a dust collecting path R2 that extends from the suction port 56 to the suction path 90 via the nozzle 55, the flexible hose 57, the elbow 65, and the filter 74 is formed.

Therefore, as in the case of the first embodiment, as shown in FIGS. 9 and 11, the rail 44 of the mounting portion 48 of the attachment 40D is fitted into the guide groove 32 of the mounted portion 34 of the main body housing 6 of the hammer drill 1A for operation. When the hook 46 of the button 45 is locked in the locking recess 33, the mounting portion 48 is joined to the mounted portion 34 and the mounting is completed. In this state, the upper cylinder 93 of the suction passage 90 comes into contact with the main body side suction port 38, and the dust collecting path R2 communicates with the main body side suction port 38.

In this state, when the switch lever 9 of the hammer drill 1 is pushed and operated to turn on the switch, the motor 4 is driven and the output shaft 5 rotates, and the motor cooling fan 15 and the dust collecting fan 37 rotate. Therefore, the dust collection path R2 becomes a negative pressure, and the outside air is sucked from the suction port 56. The sucked outside air enters the dust box 61 from the nozzle 55 through the flexible hose 57 and the elbow 65, passes through the filter 74, and then passes through the suction passage 90 to the dust collecting fan 37 from the main unit side suction port 38. Then, it is discharged from the exhaust port to the outside. Therefore, the dust generated from the material to be processed is sucked into the suction port 56 and, when passing through the dust collecting route R2, is captured by the filter 74 and stored in the dust box 61. The attachment 40D can be removed and the dust from the dust box 61 can be discarded as in the first embodiment.

As described above, also in the dust collecting system S2 of Embodiment 2, only the hammer drill 1A (power tool) to which the bit B is attached and the dust collecting path R1 including the suction port 56 (suction portion) for the bit B are provided. An attachment 40C (first dust collecting attachment), a dust collecting path R2 including a suction port 56 for the bit B, and a dust box 61 provided on the dust collecting path R2 and storing the dust sucked from the suction port 56. And an attachment 40D (second dust collection attachment) provided with, the attachment 40C and the attachment 40D are provided with a common attachment portion 48 that can be attached to the housing 2 of the hammer drill 1A, respectively. The attachment 40C and the attachment 40D can be selected and attached.
Therefore, two attachments 40C and 40D of different types can be selectively used with one hammer drill 1A, and the dust collection system S2 can be selectively used according to the type of hammer drill 1A, working environment, etc. Become.

Particularly, here, the hammer drill 1A is provided with the dust collecting fan 37 in the housing 2 and the main body side suction port 38 (suction port) to the dust collecting fan 37 is provided in the housing 2. In combination with 40D, dust collection using the dust collection fan 37 can be easily performed.
Further, when the attachment 40C is attached to the hammer drill 1A, since the main unit side suction port 38 provided in the housing 2 is closed, even with the hammer drill 1A having a self-dust collecting function, only the dust collection route R1 is provided. The attachment 40C provided with can be used without any trouble.

In addition, in common with each form, the attachment of the present invention can be selectively used not only as a hammer drill but also as an electric hammer or a drill as an electric tool. Further, the motor may face upward, and the output unit may include a crank mechanism, a clutch mechanism, or the like.
Furthermore, although the power tool of each form is an AC machine equipped with a power cord, it may be a DC machine equipped with a battery pack as a power source. In this case, the electric power tool may be provided with a wireless transmitter and the dust collector may be provided with a wireless receiver, and the operating state of the electric tool may be wirelessly communicated to the dust collector to interlock the dust collector.

Further, the structure of each attachment is not limited to the above-described form, and the shape of the main body cylinder and the casing, the slide structure of the slide cylinder, and the like can be changed as appropriate, and the dust collecting portion is not a removable dust box, but is provided so that it can be opened and closed in the casing It may be used as a dust collection chamber.
Also, the mounting portion and the mounted portion are not limited to the above-described form, such as providing a rail plate on the electric tool side and a guide groove on the attachment side. If the attachment is attached to the lower side (lower surface) of the housing of the electric power tool as in the above-described embodiment, the attachment fits well in the lower space of the housing, but the attachment is not limited to the lower side, and the attachment part and the attached part The arrangement can be modified to attach the attachment to the side or above the housing of the power tool.

1, 1A · · Hammer drills · 2 · · Housings · · · Motor housings 4 · · Motors 5 · · Output shafts 6 · · Main body housings 7 · · Output parts 10 · · Front housings 11 ·・Tool holder, 19・・Intermediate shaft, 27・・Strike, 28・・Impact bolt, 32・・Guide groove, 33・・Locking recess, 34・・Mounted part, 37・・Dust collecting fan, 38 ..Suction port of this machine, 40A, 40C..First dust collecting attachment, 40B, 40D..Second dust collecting attachment, 41..Main body cylinder, 42..Slide cylinder, 43..Rail plate, 44.. Rail, 45.. Operation button, 46.. Hook, 48.. Mounting part, 55.. Nozzle, 56.. Suction port, 58.. Dust collecting hose, 60.. Casing, 61.. Dust box, 62..Dust collecting motor, 63..Dust collecting fan, 64..Coupling part, 74..filter, 85..circular recess, 90..suction path, B..bit, R1, R2..collection Dust path, S1, S2...Dust collection system for electric tools.

Claims (7)

An electric tool with a bit attached,
A first dust collecting attachment having only a dust collecting path including a suction portion for the bit;
A second dust collection attachment including a dust collection path including a suction section for the bit, and a dust collection section provided on the dust collection path and storing the dust sucked from the suction section;
The first dust collecting attachment and the second dust collecting attachment each include a common mounting portion that can be mounted on the housing of the electric tool.
A dust collecting system for a power tool, wherein the first dust collecting attachment and the second dust collecting attachment can be selected and attached to the power tool. 2. The electric power tool according to claim 1, wherein the electric power tool includes a dust collecting fan in the housing, and the housing is provided with an air suction port for the dust collecting fan. Dust collection system. The dust collection system for a power tool according to claim 2, wherein the suction port of the housing is closed when the first dust collection attachment is attached to the power tool. The electric tool does not include a dust collecting fan in the housing, and the second dust collecting attachment includes a dust collecting fan, a dust collecting motor for rotating the dust collecting fan, and A dust box serving as a dust collecting portion is provided, and the second dust collecting attachment can be supplied with power from the electric tool in a state of being attached to the electric tool. Dust collection system for power tools as described. The dust collection system for a power tool according to any one of claims 1 to 4, wherein an output shaft of a motor and a final output shaft on which the bit is mounted are arranged in parallel in the power tool. .. 6. The power tool collector according to claim 5, wherein the first dust collecting attachment and the second dust collecting attachment can be attached to and detached from the housing by sliding in the axial direction of the final output shaft. Dust system. 7. The front portion of the housing accommodates an output portion for driving the bit, and the mounted portion to which the mounting portion is coupled is provided in the front portion. A dust collection system for electric tools according to Crab.

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