WO2010032375A1

WO2010032375A1 - Attachment for rotary tool, and rotary tool

Info

Publication number: WO2010032375A1
Application number: PCT/JP2009/003942
Authority: WO
Inventors: 町田吉隆
Original assignee: 株式会社マキタ
Priority date: 2008-09-18
Filing date: 2009-08-19
Publication date: 2010-03-25
Also published as: JP5015888B2; JP2010069571A

Abstract

An attachment for a rotary tool provides the rotary tool with a dust suction function operated by power reliably supplied from the rotary tool independent of the attitude of a contained motor. A case (32) mounted to a housing (2) is provided therein with a first bevel gear (33) connected coaxially to a front tube (15), with the case (32) mounted to the housing (2), and rotating together with the front tube (15); a speed increasing mechanism for increasing the speed of the first bevel gear (33); a suction fan (38) rotated by the speed increasing mechanism; and a filter (45) located upstream of the suction fan (38). The suction fan (38) is rotated by rotation of the front tube (15) through the first bevel gear (33) and the speed increasing mechanism to suck outside air into the case (32).

Description

Attachment for rotary tool and rotary tool

The present invention relates to a rotary tool attachment used for adding a dust absorbing function to a rotary tool such as an electric drill or a hammer drill, and a rotary tool equipped with the rotary tool attachment.

Rotating tools such as electric drills are provided with a dust suction device for sucking up dust generated by drilling work. For example, as disclosed in Patent Document 1, the dust suction device includes a suction head, a suction pipe, a suction impeller, and a separation device in front of the housing of the rotary tool, and is protruded from the housing of the rotary tool. The power of the dust suction device is obtained from the output shaft of the motor by coaxially arranging the motor output shaft and the impeller shaft projecting from the dust suction device housing.

JP-A-4-226850

In the conventional dust suction device, since the impeller shaft is coupled to the output shaft of the motor, the motor needs to be accommodated in a posture that allows the output shaft of the motor to protrude from the housing. Therefore, the dust suction device cannot be mounted if the rotary shaft is an inverted L-shaped (pistol type) rotating tool in which the motor is accommodated in a posture in which the output shaft faces forward (a posture in which the output shaft is parallel to the final output shaft). .
In addition, in order to couple the impeller to the motor arranged behind the rotary tool, the main body of the dust suction device is closer to the rear, and from there the dust suction head connected to the tip tool site, the dust suction device is The entire tool is mounted on the entire lower surface of the housing of the rotary tool, and the entire size is increased, resulting in poor usability.

Therefore, according to the present invention, it is possible to reliably obtain power from the rotating tool regardless of the motor's housing posture and add a dust absorption function, and it is possible to mount the rotating tool in a compact state, which may impair usability. It is intended to provide an attachment for a rotating tool that is not.

In order to achieve the above object, the invention according to claim 1 is an attachment for a rotary tool attached to a rotary tool provided with a rear output shaft that rotates at a reduced speed from an output shaft of a motor,
A case mounted on a housing of the rotary tool, a connection member coaxially connected to the rear output shaft in a state where the case is mounted on the housing, and rotating integrally with the rear output shaft; and rotation of the connection member A speed increasing mechanism that speeds up, a suction fan that is rotated by the speed increasing mechanism, and a filter that is located upstream of the suction fan, and the rotation of the rear output shaft causes the connection member and the speed increasing mechanism to pass through. Then, the suction fan is rotated to suck outside air into the case.
In this case, in order to make the downsizing of the attachment more effective, the rear output shaft is used as the final output shaft that rotates the bit provided at the tip of the rotary tool integrally, or the final output shaft of the rotary tool The tip part is a replacement unit that can be attached and detached with the bit attached, and in order to easily attach and detach the attachment for the rotary tool, the connecting member can be connected to the replacement unit, or the rear output shaft can be A bit provided at the tip of the rotary tool can be used as an intermediate shaft provided between the final output shaft that rotates integrally with the output shaft of the motor.
In order to achieve the above object, the invention described in claim 10 is a rotary tool, wherein the housing, the motor, a rear output shaft that rotates while being decelerated from the output shaft of the motor, and the first embodiment. The rotary tool attachment includes: an introduction portion that guides a connecting member of the rotary tool attachment to a connection position with the rear output shaft; and a connecting portion with the connecting member that is formed on the rear output shaft. It is mounted.
In this case, the housing may have a pistol shape in which the final output shaft and the output shaft of the motor are arranged in parallel.

According to invention of

Claim

1 and 10, power can be reliably acquired from a rotary tool irrespective of the accommodation position of a motor, and a dust absorption function can be added. Further, since the rotary tool attachment is mounted at the front portion of the rotary tool, the whole is compact and does not impair the usability of the rotary tool.
In particular, when the rear output shaft is a final output shaft that integrally rotates a bit provided at the tip of the rotary tool, the rotary tool attachment is disposed in the forefront of the rotary tool, and the lower portion of the housing is clean. Therefore, it is possible to more effectively achieve downsizing when the rotary tool attachment is mounted.
Further, if the connecting member is connected to the replacement unit, the attachment / detachment of the rotary tool attachment can be easily performed according to the attachment / detachment of the replacement unit.
Furthermore, if the rear output shaft is an intermediate shaft, the design change of the rotary tool associated with the mounting of the rotary tool attachment can be reduced, and the rotary tool attachment can be easily mounted on the existing rotary tool.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Form 1]
FIG. 1 is an explanatory view showing a state in which a rotary tool attachment (hereinafter simply referred to as “attachment”) is mounted on a hammer drill which is an example of a rotary tool.
The hammer drill 1 has an inverted L-shape (pistol shape) as a whole, and a motor 3 is accommodated behind the housing 2 in a posture with the output shaft 4 facing forward (the left side is the front). On the side, an intermediate shaft 5 in which the first gear 6 provided at the rear end is engaged with the output shaft 4 is supported in parallel with the output shaft 4. A bit is inserted into the front end on the upper front side of the intermediate shaft 5. A possible cylindrical tool holder (final output shaft) 7 is supported in parallel with the intermediate shaft 5. Reference numeral 8 denotes a handle, and a switch 9 having a trigger 10 protruding forward is provided inside.

Here, the tool holder 7 is fixed to the front end of the rear cylinder 11 that is pivotally supported in the housing 2 and into which the piston cylinder 12 is inserted, and the front end of the intermediate cylinder 13 is accommodated. Moreover, it has a divided structure in which the front cylinder 15 is packaged. An operation sleeve 16 for locking and releasing the bit inserted into the front cylinder 15 is externally mounted on the front part of the front cylinder 15, and the rear part of the front cylinder 15 is in an external state to the middle cylinder 13.

Steel balls

17, 17 that engage with the outer surface of the middle cylinder 13 are provided. That is, the front cylinder 15 portion to which the bit is attached is a separate exchange unit 18 that can be attached to and detached from the middle cylinder 13 together with the bit.

On the other hand, the intermediate shaft 5 and the tool holder 7 are provided with a rotation / striking mechanism. This rotation / striking mechanism includes a swash bearing on a rotation mechanism in which a second gear 19 provided in front of the intermediate shaft 5 is engaged with a gear 20 provided in a tool holder, and a boss sleeve 21 provided in the rear of the intermediate shaft 5. And a striking mechanism in which an arm 23 provided via 22 is connected to the piston cylinder 12, and a clutch 24 provided on the intermediate shaft 5 is moved back and forth from the outside of the housing 2 by operating a switching knob (not shown). By sliding operation, the clutch 24 rotates only the second gear 19 to rotate the tool holder 7 and the bit, and only the boss sleeve 21 is rotated to move the piston cylinder 12 back and forth via the arm 23. A hammer mode in which the accommodated striker 25 strikes the bit via the impact bolt 14 and the second gear 19. A hammer drill mode for imparting a rotation and a blow to the bit both rotate and the boss sleeve 21 at the same time has a respectively selectable.

The attachment 30 includes a cylindrical mounting portion 31 that is externally mounted on the front end portion of the housing 2 that pivotally supports the rear cylinder 11 of the tool holder 7, and a case 32 that is provided below the mounting portion 31. . In the mounting portion 31, a first bevel gear 33 is provided as a connecting member integrally mounted on a connecting portion 26 formed behind the front cylinder 15 of the tool holder 7, and the operation sleeve 16 of the hammer drill 1 and the housing are provided. It is exposed to the outside through an introduction portion 27 formed between the two front end portions. The mounting part 31 covers the introduction part 27 by covering the outside of the first bevel gear 33 except for the case 32 side and allowing the front end to be loosely inserted into the operation sleeve 16. By connecting the first bevel gear 33 to the front cylinder 15 of the replacement unit 18 in this way, the attachment 30 is attached to and detached from the housing 2 as the replacement unit 18 is attached and detached.

Further, in the case 32, a speed increasing shaft 34 provided with a second bevel gear 35 meshing with the first bevel gear 33 at the upper end is axially supported by a ball bearing 36, and a suction fan 38 is connected to the lower end. The fan shaft 37 is supported by a ball bearing 39 in parallel with the speed increasing shaft 34, and a large diameter gear 40 provided integrally with the speed increasing shaft 34 is provided with a small diameter gear 41 provided integrally with the upper end of the fan shaft 37. Is engaged. The structure from the second bevel gear 35 to the fan shaft 37 is the speed increasing mechanism of the present invention. The suction fan 38 is a centrifugal fan accommodated in a storage chamber 42 defined in the case 32, and a plurality of

exhaust ports

43, 43... Are formed on the outer peripheral side of the suction fan 38 in the storage chamber 42. On the other hand, a dust suction chamber 44 having a filter 45 at the upper end is formed below the storage chamber 42, and the storage chamber 42 and the dust suction chamber 44 are communicated to the lower wall of the storage chamber 42 via the filter 45. A communication hole 46 is formed.

Furthermore, a cylindrical suction port 47 is provided in the lower portion of the dust suction chamber 44 so as to protrude rearward, and a flexible hose 48 can be connected to the suction port 47. The flexible hose 48 has a known configuration in which a dust suction head that is disposed in front of the replacement unit 18 and can suck outside air from around the bit is attached to the front end.

When the attachment 30 configured as described above is mounted on the hammer drill 1 as shown in FIG. 1 and the trigger 3 is pushed to drive the motor 3, the rotation of the output shaft 4 is transmitted to the intermediate shaft 5, Rotate and / or hit the bit in the selected mode of operation.
Here, when the drill mode or the hammer drill mode is selected, the rotation of the intermediate shaft 5 is transmitted to the tool holder 7 via the second gear 19 and the gear 20, so the first bevel gear 33 that is integral with the front cylinder 15 of the tool holder 7. Also rotate. Therefore, the speed increasing shaft 34 rotates through the second bevel gear 35, and the fan shaft 37 rotates through the large diameter gear 40 and the small diameter gear 41.

When the suction fan 38 is rotated by the rotation of the fan shaft 37, the outside air is sucked from the dust suction head of the flexible hose 48, enters the dust suction chamber 44 from the flexible hose 48 through the suction port 47, passes through the filter 45, and is stored in the storage chamber. 42 to the outside of the case 32 from the exhaust port 43. Due to this air flow, dust sucked together with outside air from the dust suction head also enters the dust suction chamber 44 from the flexible hose 48 through the suction port 47, where it is captured by the filter 45 and stored in the dust suction chamber 44. Become.

As described above, according to the attachment 30 and the hammer drill 1 of the first aspect, the case 32 is attached to the housing 2 and is coaxially connected to the front cylinder 15 with the case 32 attached to the housing 2. 15, a first bevel gear 33 that rotates integrally with the motor 15, a speed increasing mechanism that speeds up the rotation of the first bevel gear 33, a suction fan 38 that rotates by the speed increasing mechanism, and a filter that is located upstream of the suction fan 38. 45, the suction fan 38 is rotated by the rotation of the front cylinder 15 via the first bevel gear 33 and the speed increasing mechanism, and the outside air is sucked into the case 32. Power can be reliably obtained from the hammer drill 1 and a dust absorbing function can be added. Further, since the attachment 1 is mounted at the front portion of the hammer drill 1, the whole is compact and the usability of the hammer drill 1 is not impaired. Therefore, the attachment 30 can be mounted without any trouble even with the hammer drill 1 having the pistol-shaped housing 2.

In particular, here, the rear output shaft is the tool holder 7 that integrally rotates the bit provided at the tip of the hammer drill 1, so that the attachment 30 is disposed in the forefront of the hammer drill 1 and the lower portion of the housing 2 is clean. . Therefore, the downsizing when the attachment 30 is mounted can be achieved more effectively.
Furthermore, since the first bevel gear 33 is connected to the front cylinder 15 of the replacement unit 18, the attachment 30 can be easily attached and detached in accordance with the attachment and detachment of the replacement unit 18.

In the first aspect, the first bevel gear is provided in the replacement unit, but it may be provided on the middle cylinder side. Further, the front end of the tool holder is not limited to the replacement unit, and it is of course possible to externally attach the first bevel gear to the integrated tool holder. In this case, since the first bevel gear is fixed to the tool holder, the first bevel gear is exposed from the introduction portion provided in the housing of the hammer drill, and the attachment of the case of the attachment causes the second bevel gear on the case side to be the first bevel gear. It is conceivable to have a configuration that meshes with.
Further, the connection member is not limited to the bevel gear, and rotation transmission to the speed increasing mechanism may be performed using another gear such as a spur gear.

[Form 2]
Next, another embodiment will be described. In addition, the same code | symbol is attached | subjected to the same structure part as the form 1, and the overlapping description is abbreviate | omitted.
The attachment 30 shown in FIG. 2 is different from the first embodiment in that power is obtained from the intermediate shaft 5 instead of the tool holder 7. Here, the first bevel gear 33 is pivotally supported by a ball bearing 50 in the case 32, and a shaft portion 51 provided coaxially protrudes rearward through the case 32. On the other hand, an introduction hole 52 as an introduction part is formed at a position in front of the intermediate shaft 5 in the housing 2, and the shaft part 51 penetrates the introduction hole 52 and protrudes into the housing 2 when the attachment 30 is attached. It is supposed to be. On the front end surface of the intermediate shaft 5, a connection hole 54 is formed as a connection portion that is connected to the connection shaft 53 that is coaxially projected on the rear end surface of the shaft portion 51 by fitting between the squares. Note that the mounting portion 31 has a ring shape that is externally mounted on the front end portion of the housing 2, and the tool holder 7 is an integrated type in which the tip portion is not attached or detached.

In the state where the attachment 30 configured as described above is mounted on the housing 2, the first bevel gear 33 is connected coaxially with the intermediate shaft 5, and the rotation of the intermediate shaft 5 is transmitted to the first bevel gear 33. Therefore, when the motor 3 is driven in this state and the rotation of the output shaft 4 is transmitted to the intermediate shaft 5, the first bevel gear 33 rotates together with the rotation of the intermediate shaft 5, and the speed is increased via the second bevel gear 35. The shaft 34 is rotated. Therefore, the fan shaft 37 rotates through the large-diameter gear 40 and the small-diameter gear 41, and the suction fan 38 is rotated.

Thus, also in the attachment 30 and the hammer drill 1 of the said form 2, power can be reliably acquired from the hammer drill 1 irrespective of the accommodation attitude | position of the motor 3, and a dust absorption function can be added. Further, since the attachment 30 is mounted at the front portion of the hammer drill 1, the whole is compact and does not impair the usability of the hammer drill 1.
In particular, since the rear output shaft is the intermediate shaft 5 provided between the tool holder 7 and the output shaft 4, the design change of the hammer drill 1 for attaching the attachment 30 can be reduced. The attachment 30 can be mounted on the existing hammer drill 1 by a simple design change in which the connection hole 54 is formed in the housing 5 and the introduction hole 52 is formed in the housing 2.

In the second aspect, the connecting shaft is provided in the shaft portion of the first bevel gear, and the connecting hole is provided in the intermediate shaft, but they may be provided on the opposite sides. Further, the coupling between the coupling shaft and the coupling hole is not limited to the fitting between the squares, but a two-surface width fitting or a spline coupling may be employed.
Further, here, the connecting member is not limited to the bevel gear, and other gears such as a spur gear can be employed.

In common with the first and second embodiments, the number and arrangement of shafts and gears in the speed increasing mechanism can be changed as appropriate, and the suction fan, filter, and the like are not limited to the first and second embodiments. Also, the shape of the case can be formed along the housing on the rotary tool side, the suction port can be directed forward or sideways, and the dust suction chamber can be detachably formed.
Furthermore, in the said form, although the connection member is connected with the final output shaft or the intermediate shaft, you may utilize another back | latter stage output shaft.
In addition, the motor may be of a type in which the output shaft is accommodated in the vertical direction, and the present invention is applicable not only to a hammer drill but also to other rotary tools such as a drill and a vibration drill.

It is explanatory drawing of the hammer drill and attachment of form 1. It is explanatory drawing of the hammer drill and attachment of form 2.

Explanation of symbols

1 .... Hammer drill, 2 .... Housing, 3 .... Motor, 4. Output shaft, 5 .... Intermediate shaft, 7 .... Tool holder, 11 .... Rear cylinder, 13 .... Middle cylinder, 15 .... Front Tube, 18 ... Replacement unit, 27 ... Connection part, 28 ... Introduction part, 30 ... Rotary tool attachment, 31 ... Installation part, 32 ... Case, 33 ... First bevel gear, 34 ... Addition Speed shaft, 35 ... Second bevel gear, 37 ... Fan shaft, 38 ... Suction fan, 40 ... Large gear, 41 ... Small diameter gear, 42 ... Storage chamber, 43 ... Exhaust port, 44 ... Dust collection chamber, 45 ... Filter, 47 ... Suction port, 48 ... Flexible hose, 51 ... Shaft section, 52 ... Introduction hole, 53 ... Connection shaft, 54 ... Connection hole.

Claims

A rotary tool attachment mounted on a rotary tool provided with a rear stage output shaft that is decelerated from the motor output shaft and rotates.
A case attached to the housing of the rotary tool;
A connection member that is coaxially connected to the rear output shaft in a state where the case is mounted on the housing, and rotates integrally with the rear output shaft;
A speed increasing mechanism for speeding up the rotation of the connecting member;
A suction fan that is rotated by the speed increasing mechanism;
A filter located upstream of the suction fan;
A rotary tool attachment, wherein the suction fan is rotated via the connecting member and the speed increasing mechanism by rotation of the rear output shaft, and the outside air is sucked into the case.
The rotary tool attachment according to claim 1, wherein the rear output shaft is a final output shaft that integrally rotates a bit provided at a tip of the rotary tool.
The tip of the final output shaft of the rotary tool is a replacement unit that can be attached and detached with the bit mounted, and the connecting member is connected to the replacement unit. Attachment for rotary tools of 2.
The final output shaft is a cylindrical tool holder into which a bit can be inserted at the front end, and the exchange unit is provided with an operation sleeve for locking and releasing the inserted bit, and the tool can be attached and detached together with the bit. The rotary tool attachment according to claim 3, wherein the attachment is a front tube portion of the holder.
The attachment for a rotary tool according to claim 1, wherein the connecting member is a bevel gear.
The speed increasing mechanism includes a speed increasing shaft provided with a bevel gear and a large diameter gear that mesh with the bevel gear, and a fan shaft provided with a small diameter gear that connects the suction fan and meshes with the large diameter gear. The attachment for rotary tools according to claim 4.
The said back | latter stage output shaft was used as the intermediate shaft provided between the final output shaft which rotates the bit provided in the front-end | tip of the said rotary tool integrally, and the output shaft of the said motor. Attachment for rotating tools.
8. The connecting member as a bevel gear, wherein the bevel gear is provided with a shaft portion that passes through an introduction hole formed in front of the intermediate shaft in the housing and is coaxially coupled to the intermediate shaft. Attachment for rotating tools as described in 1.
The rotation according to claim 8, wherein the shaft portion and the intermediate shaft are coupled by fitting a connecting shaft provided in the shaft portion and a connecting hole provided in a front end surface of the intermediate shaft. Tool attachment.
A rotary tool,
A housing;
A motor,
A rear output shaft that is decelerated from the output shaft of the motor and rotates;
An introduction part for guiding the connecting member of the attachment for a rotary tool according to claim 1 to a connecting position with the rear output shaft;
A connecting portion formed on the rear output shaft and connected to the connecting member;
A rotary tool including the rotary tool attachment.
The rotary tool according to claim 10, wherein the housing has a pistol shape in which the final output shaft and the output shaft of the motor are arranged in parallel.