JP2010207965A - Impact tool attachment and impact tool, and rotary tool attachment and rotary tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily remove a bit cut into a workpiece. <P>SOLUTION: In an impact tool attachment 1, a front attachment portion 3 to which other bit is insertedly attached is disposed at a front section of a body shaft 2, and a rear attachment portion 4 attachable to an anvil of an impact wrench is disposed at a rear section of the body shaft 2. The front attachment portion 3 has the same structure as an attachment portion of a bit disposed at the front end of an electric hammer or a hammer drill, and the rear end of a bit inserted into an insertion hole 8 is connectable by a ball and a projection 11. Similarly to the rear end of a socket attached to the anvil of the impact wrench, the rear attachment portion 4 includes an anti-disconnect mechanism comprised of a through-hole 15, a pin 16, a recessed groove 17, and an O-ring 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an impact tool attachment that is used by attaching to an impact tool such as an electric hammer or hammer drill, an impact tool that is equipped with the attachment, and a rotation that is attached to a rotary tool such as an electric drill or hammer drill. The present invention relates to a tool attachment and a rotary tool equipped with the attachment.

  When using a power tool such as an electric hammer or hammer drill to cut or pierce work material such as reinforced concrete, the bit attached to the tip of the power tool bites into the work material, leaving the bit in place. It may become impossible to escape. If the power tool is a type having a bit forward / reverse switching function as disclosed in Patent Document 1, the bit can be reversed to try extraction.

JP 2005-297183 A

  However, if the bit bites strongly, it may not come off easily even if it is reversed. Moreover, the electric tool to be used may not have a forward / reverse switching function. Therefore, in these cases, it is necessary to suspend the work and remove the bit separately, which causes a reduction in workability.

  Therefore, the present invention provides an attachment for a hammering tool and an attachment for a rotary tool that can easily remove a bit that has bitten on a work material using a normal hammering tool or a rotary tool, regardless of whether there is a forward / reverse switching function. And an impact tool and a rotary tool using the attachment.

In order to achieve the above object, the invention according to claim 1 is an attachment for a striking tool used in a striking tool having a final output shaft that causes intermittent striking in the rotation direction, and is provided at the rear of the main shaft. The rear part is provided with a rear mounting part that can be attached to the final output shaft, while the front part of the main body shaft is provided with a front mounting part that can integrally connect the rear end of another bit in the rotational direction. It is.
According to a second aspect of the present invention, in the configuration of the first aspect, the front mounting portion further includes a retaining mechanism for integrally connecting the rear ends of the bits in the axial direction.
In order to achieve the above object, the invention described in claim 3 is a striking tool having a final output shaft that causes intermittent striking in the rotation direction, and the final output shaft is described in claim 1 or 2. This is characterized in that a rear mounting portion of the impact tool attachment is mounted.
In order to achieve the above object, the invention according to claim 4 is an attachment for a rotary tool used in a rotary tool having a final output shaft that rotates, an input shaft that can be attached to the final output shaft, An output shaft disposed in front of the input shaft and having a front mounting portion at the front end capable of integrally connecting the rear ends of other bits in the rotational direction is provided between the input shaft and the output shaft. And a striking mechanism that causes intermittent striking in the rotational direction on torque transmitted from the input shaft to the output shaft due to an increase in load.
According to a fifth aspect of the present invention, in the configuration of the fourth aspect, the front mounting portion further includes a retaining mechanism that integrally connects the rear ends of the bits in the axial direction.
According to a sixth aspect of the present invention, in the configuration of the fourth or fifth aspect, the striking mechanism is connected to the input shaft so as to be able to rotate and move back and forth within a predetermined range, and is rotated to the rear end of the output shaft at the advanced position. And a biasing means for biasing the hammer to the forward position, and the hammer repeatedly engages and disengages with respect to the rear end of the output shaft due to an increase in load on the output shaft. It is characterized by generating a blow.
In order to achieve the above object, the invention described in claim 7 is a rotary tool having a rotating final output shaft, and the rotary tool attachment according to any one of claims 4 to 6 on the final output shaft. The input shaft is mounted.

According to the present invention, a bit that bites into a work material can be easily extracted using an attachment. Therefore, the work is interrupted for a short time, and the deterioration of workability is suppressed.
According to the second and fifth aspects of the invention, in addition to the above effects, the bit can be attached to the attachment more reliably by adopting the retaining mechanism.
According to the sixth aspect of the present invention, in addition to the above effect, the striking mechanism can be easily provided on the attachment.

It is a perspective view of the attachment for impact tools of form 1. It is explanatory drawing of the attachment for impact tools of form 1, (A) is a longitudinal cross-section, (B) shows an AA line cross section, (C) shows a BB line cross section, respectively. It is explanatory drawing of the impact wrench equipped with the attachment for impact tools of form 1. It is explanatory drawing of the attachment for impact tools of Embodiment 1, and an impact wrench, (A) is a partial longitudinal cross-section, (B) shows CC line cross section, respectively. It is a perspective view of the attachment for rotary tools of form 2. It is a longitudinal cross-sectional view of the attachment for rotary tools of form 2. (A) is a DD line cross section, (B) is a EE line cross section, and (C) is a FF line cross section. It is explanatory drawing of the hammer drill equipped with the attachment for rotary tools of the form 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Form 1]
The impact tool attachment (hereinafter simply referred to as “attachment”) 1 shown in FIGS. 1 and 2 has another bit on the front portion (referred to as the left front in FIGS. 1 and 2) of the cylindrical body shaft 2. While having a front mounting portion 3 that can be inserted and mounted, a rear mounting portion 4 that can be mounted on an impact wrench is provided at a rear portion of the main body shaft 2.
First, the front mounting portion 3 has the same structure as the mounting portion of the bit provided at the front end of an electric hammer or hammer drill, and a sleeve 6 for attaching and detaching operation is provided behind the cap 5 fitted on the front end of the body shaft 2. It is provided so as to be able to move back and forth in the axial direction, and is biased to a forward position where it abuts against the cap 5 by a coil spring 7 which is externally mounted on the body shaft 2 within the sleeve 6.

The body shaft 2 is formed with an insertion hole 8 for another bit at the center, and a communication hole 10 that communicates with the insertion hole 8 and accommodates the ball 9 so that it can protrude and retract with respect to the insertion hole 8. ing. Further, on the inner surface of the insertion hole 8, a pair of protrusions 11, 11 protruding in a point-symmetric manner extending in the axial direction with a phase difference of 90 degrees with respect to the communication hole 10.
On the other hand, the inner surface of the sleeve 6 is formed with a pressing portion 12 that presses the ball 9 from the outer side at the forward position to protrude into the insertion hole 8, and the front end of the sleeve 6 moves backward against the bias of the coil spring 7. An escape portion 13 that allows the ball 9 to be retracted from the insertion hole 8 at a position is formed.

  And the rear mounting part 4 has the same structure as the rear end of the socket mounted on the anvil of an impact wrench described later. That is, a connecting hole 14 having a square cross section that communicates coaxially with the insertion hole 8, a through hole 15 that communicates with the connecting hole 14 and opens to the left and right of the body shaft 2, and a pin 16 that is inserted into the through hole 15. And an O-ring 18 which is externally mounted in a concave groove 17 formed on the outer periphery of the rear portion of the body shaft 2 at the front and rear positions aligned with the pin 16 and prevents the pin 16 from coming off. The concave groove 17 and the O-ring 18 serve as a retaining mechanism of the present invention. Further, in a state where the pin 16 is inserted into the through hole 15, the axis of the main body shaft 2 intersects the axis of the main body 2 perpendicularly and penetrates the connecting hole 14, and the O ring 18 is shifted from the concave groove 17, thereby The pin 15 can be removed from the shaft 2.

  The attachment 1 configured as described above is attached to an impact wrench 20 as shown in FIG. The impact wrench 20 here houses a motor 22 behind a housing 21 (here, on the left side in FIG. 3), and a spindle 24 is arranged in front of it via a planetary gear reduction mechanism 23. A striking mechanism 26 is provided between the spindle 24 and the anvil 25, with an anvil 25 serving as a final output shaft coaxially supported at the front end of the housing 21 in front of the shaft. A trigger 27 drives the motor 22 by a push operation.

The striking mechanism 26 includes a hammer 28 that is rotatably and axially movable at the front end of the spindle 24, and the hammer 28 is formed on the inner surface of the hammer 28 and an inclined groove 29 formed on the outer surface of the spindle 24. It is connected to the spindle 24 via a ball 31 that fits across the axial groove 30 formed. Further, the hammer 28 is urged to a forward position shown in FIG. 3 regulated by the ball 31 by a coil spring 32 provided at the rear. At this forward position, taper claws (not shown) provided on the front surface of the hammer 28 can be engaged with the pair of arms 33, 33 provided radially at the rear end of the anvil 25 in the rotational direction.
And the front-end | tip of the anvil 25 is formed in the cross-sectional square, and the retaining hole 34 which can insert the pin 16 is formed in the left-right direction.

Accordingly, the pin 16 is removed from the rear mounting portion 4 of the attachment 1, the tip of the anvil 25 of the impact wrench 20 is inserted into the connection hole 14, and the pin 16 is inserted into the tip of the main body shaft 2 and the anvil 25 again to dent the O-ring 18. When the groove 17 is externally mounted, the attachment 1 is connected to the anvil 25 as shown in FIG.
In the front mounting portion 3, a pair of concave portions 37 and 37 into which the ball 9 is fitted and the ridges 11 and 11 are fitted into the shank portion 36 at the rear end of the bit 35 that has bitten the work material. Since the pair of grooves 38 and 38 are formed, the shank portion 36 is aligned with the phase of the protrusion 11 and the groove 38 in a state where the sleeve 6 is slid to the retracted position and the pressure of the ball 9 is released. When the sleeve 6 is returned to the advanced position in the state where the ball 9 is inserted, the ball 9 is fitted into one of the recesses 37 to be prevented from coming off, and the protrusion 11 and the groove 38 are fitted in the rotational direction. Integrated. Such a bit mounting structure is well known in Japanese Patent Publication No. 3-505996, US Pat. No. 4,123,074, and the like.

  When the bit 35 is connected to the anvil 25 via the attachment 1 in this way and the trigger 27 is pressed to drive the motor 22, the spindle 24 rotates and torque is transmitted to the anvil 25 via the hammer 28. Further, the torque is transmitted to the bit 35 via the attachment 1. At this time, if the bit 35 remains on the work material, the anvil 25 integrated with the bit 35 does not rotate and the load increases, so the hammer 28 tilts the ball 31 against the bias of the coil spring 32. Retreat while rolling along the groove 29. When the taper claw of the hammer 28 is disengaged from the arm 33 of the anvil 25, the taper claw is advanced by the bias of the coil spring 32 and is rotated by the guide of the ball 31 rolling along the inclined groove 29. Is reengaged to cause impact (impact) in the rotational direction. By repeatedly engaging and disengaging the arm 33 in this manner, a hit is generated intermittently and transmitted to the bit 35 via the attachment 1, so that the bit 35 rotates against biting and is extracted from the work material. it can.

  Thus, according to the first aspect, the rear mounting portion 4 that can be mounted on the anvil 25 of the impact wrench 20 is provided in the rear portion of the main body shaft 2, while the rear end of the bit 35 is disposed in the front portion of the main body shaft 2. By using the attachment 1 including the front mounting portion 3 that can be integrally connected in the rotation direction, the bit 35 that bites into the work material can be easily extracted using the impact wrench 20. Therefore, the work is interrupted for a short time, and the deterioration of workability is suppressed.

  The structure of the front mounting portion and the rear mounting portion is not limited to the above-described form 1, but can be appropriately changed in design according to the shape of the shank portion of the bit and the shape of the anvil of the impact wrench. The main body shaft does not need to be cylindrical, and an insertion hole for the shank portion and a connecting hole for the anvil can be formed as bottomed holes at the front and rear ends.

  Further, in the first aspect, a pin or an O-ring is used for the retaining mechanism of the rear mounting portion. However, the rear mounting portion is provided with an engaging portion for retaining the attachment on the final output shaft side of the impact tool. Only the engaged portion with which the engaging portion is engaged may be provided. FIG. 4 shows an example in which a retaining pin 39 is provided as an engaging portion on the anvil 25 of the impact wrench 20, and the retaining pin 39 is tapered at the tip and is formed with the axis of the anvil 25. The distal end of the coil spring 39a is urged to a projecting position projecting from the side surface of the anvil 25 by a coil spring 39a accommodated in the orthogonal direction so as to be able to protrude and retract from the side surface. Reference numeral 39b denotes a clip that is locked to the rear end of the retaining pin 39 in the anvil 25 and restricts the protrusion of the retaining pin 39b.

  Therefore, it is only necessary to provide the rear mounting portion 4 of the attachment 1 only with the through hole 15 into which the retaining pin 39 engages as the engaged portion in the connecting hole 14 into which the anvil 25 is inserted. Such a structure eliminates the need for attaching / detaching the O-ring and inserting / removing the pins as in the first aspect, so that the attachment 1 can be attached to and detached from the anvil 25 more easily with one touch.

On the other hand, in the above-described form 1 and the example of FIG. 4, the structure is such that the final output shaft of the impact tool is inserted into the connection hole of the rear mounting portion and connected, but a structure opposite to this may be used. For example, the mounting structure of the bit on the final output shaft of the impact tool is such that the final output is achieved by pressing a pressing body such as a ball provided on the final output shaft toward the shaft center side with a chuck sleeve provided on the outer periphery of the final output shaft. When engaging and integrating with a bit inserted into the shaft center of the shaft, the same shaft portion as the rear end of the bit is formed as a rear mounting portion, and this shaft portion is inserted into and mounted on the final output shaft. Become.
In addition, it is not always necessary to remove the bit. If the bite is released, it is possible to continue the work by attaching it to a rotary tool such as a drill again. It can be limited to.
Further, the impact tool is not limited to the impact wrench, and other tools such as an impact driver may be used as long as the attachment can be connected.

[Form 2]
Next, the form of the rotary tool attachment will be described. However, the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.
5 and 6, a rotary tool attachment (hereinafter simply referred to as “attachment”) 40 supports a cylindrical output shaft 43 via a metal bearing 42 at the front end of a case 41 having a bell-shaped longitudinal section. Then, as shown in FIG. 7A, the front mounting portion 3 that is the same as in the first embodiment is provided at the tip of the output shaft 43 protruding from the case 41 so that the shank portion 36 of the bit 35 can be connected.
On the other hand, the rear surface of the case 41 is closed by a disc-shaped lid body 44 having an internal gear portion 45 on the front surface, and a rear input shaft 46 penetrating through the center of the lid body 44 projects rearward. In addition, a pair of bars 47 and 47 extending rearward are integrally formed at the left and right ends of the rear surface of the lid body 44.

As shown in FIG. 7B, the rear end of the rear input shaft 46 is also point-symmetric with a pair of concave portions 48, 48 that are point-symmetric and 90 ° out of phase with the concave portion 48. A pair of concave grooves 49, 49 reaching the rear end is formed, while the front end of the rear input shaft 46 is a carrier that supports three planetary gears 51, 51,... As shown in FIG. The planetary gears 51 are configured to be planetary motions within the internal gear unit 45. At the center of the carrier portion 50, a bottomed hole 52 is formed that is located at the center of the planetary gear 51 and opens forward.
In the case 41, a front input shaft 53 is provided in front of the rear input shaft 46. The front input shaft 53 has a pinion 54 that is loosely inserted into the bottomed hole 52 of the rear input shaft 46 and meshes with the planetary gear 51 at the rear end, and a small-diameter portion 55 that protrudes at the front end. By being loosely inserted into the rear end, the rear input shaft 46 and the output shaft 43 are coaxially supported. A disk portion 56 is formed in front of the pinion 54 and abuts against the front end surface of the rear input shaft 46.

  A striking mechanism 57 is provided between the front input shaft 53 and the output shaft 43. This striking mechanism 57 is the same as that provided in the impact wrench 20 described in the first embodiment, and includes a hammer 58 that is externally mounted in front of the front input shaft 53, and the hammer 58 is provided with an inclined groove 59 on the outer surface of the front input shaft 53. And a ball 61 fitted across the axial groove 60 on the inner surface of the hammer 58. In addition, a coil spring 62 as an urging means is provided between the hammer 58 and the disk portion 56 to urge the hammer 58 to a forward position, and a pair of tapered claws 63, 63 (see FIG. 8) can be engaged in a rotational direction with a pair of arms 64, 64 provided radially to the rear end of the output shaft 43.

  The attachment 40 configured as described above is attached to a rotary tool such as a hammer drill 70 shown in FIG. The hammer drill 70 supports an intermediate shaft 73 parallel to the output shaft 72 of the motor in a housing 71 and a cylindrical tool holder 74 serving as a final output shaft above the intermediate shaft 73. Yes. A gear 76 that meshes with a gear 75 provided on the tool holder 74 is provided in front of the intermediate shaft 73, and a boss sleeve 77 provided with a tilt arm 79 via a swash bearing 78 is provided on the intermediate shaft 73 at the rear of the intermediate shaft 73. A clutch 80 is provided between the gear 76 and the boss sleeve 77 and is spline-coupled to the intermediate shaft 73. When the clutch 80 is slid by a switching member (not shown) provided outside the housing 71, the clutch 80 engages only with the gear 76, the hammer mode engages only with the boss sleeve 77, the gear 76, Each can be switched to a hammer drill mode for engaging with the boss sleeve 77.

On the other hand, a piston cylinder 81 whose rear end is connected to the tilt arm 79 is loosely inserted in the rear part of the tool holder 74, and the striker 83 is accommodated in the piston cylinder 81 via the air chamber 82 so as to be movable back and forth. is doing. An intermediate element 84 is housed in the tool holder 74 in front of the striker 83 so as to be movable back and forth.
A bit mounting portion 86 is provided at the front end portion 85 of the tool holder 74 protruding from the housing 71. As with the front mounting portion 3 of the attachment 40, the mounting portion 86 includes a ball 88 that can be projected and retracted with respect to the insertion hole 87 formed in the front end portion 85 at the front end portion 85, and a pair that is out of phase with the ball 88. Ridges 89 and 89. In addition, a sleeve 90 that urges the front end portion 85 to the front position by the coil spring 91 and presses the ball 88 to the protruding position into the insertion hole 87 is provided on the outer periphery of the front end portion 85.
Further, a side handle (not shown) that projects laterally from the housing 71 is connected to the front end of the housing 71 via a ring-shaped clamp portion 92.

  Therefore, in the mounting portion 86 of the hammer drill 70, the rear input shaft 46 of the attachment 40 is inserted into the insertion hole 87 of the front end portion 85 of the tool holder 74 in the state where the sleeve 90 is slid rearward. The sleeve 90 is returned to the front position. Then, the ball 88 is fitted into one recess 48 of the rear input shaft 46 and is prevented from coming off in the axial direction, and the rear input shaft 46 is integrated in the rotational direction by fitting the concave groove 49 and the protrusion 89. The attachment 40 is coupled to the tool holder 74. At this time, the bars 47 and 47 of the attachment 40 reach the outer periphery of the clamp portion 92 of the side handle and sandwich the clamp portions 92 and 92 from above and below.

  In the front mounting portion 3, the sleeve 6 is slid to the retracted position to release the pressure of the ball 9, and the shank portion 36 is inserted into the insertion hole 8 with the phases of the ridge 11 and the groove 38 being matched. And the sleeve 6 is returned to the advanced position. Then, the ball 9 is fitted into one of the recesses 37 to be prevented from coming off, and the bit 35 is connected to the output shaft 43 of the attachment 40 by being integrated in the rotation direction by fitting the protrusion 11 and the groove 38. Is done.

  With the bit 35 connected to the tool holder 74 via the attachment 40 in this way, the hammer drill 70 selects a drill mode in which the clutch 80 is engaged only with the gear 76 and pushes a trigger (not shown) to drive the motor. Let Then, the intermediate shaft 73 rotates and torque is transmitted to the tool holder 74 via the clutch 80 and the gears 76, 75, and is decelerated by the planetary gear 51 from the rear input shaft 46 of the attachment 40 and transmitted to the front input shaft 53.

  At this time, if the bit 35 remains on the work material, the output shaft 43 integrated with the bit 35 does not rotate and the load increases, so that the hammer 58 resists the bias of the coil spring 62 and the ball 61. Is moved back along the inclined groove 59. When the taper claws 63 and 63 of the hammer 58 are disengaged from the arms 64 and 64 of the output shaft 43, the hammer 58 advances by the bias of the coil spring 62 and is guided by the ball 61 rolling along the inclined groove 59. By rotating, the taper claws 63, 63 are reengaged with the arms 64, 64 to cause impact (impact) in the rotational direction. By repeatedly engaging and disengaging with the arm 64 in this manner, the impact is intermittently generated and transmitted to the bit 35 via the output shaft 43, so that the bit 35 rotates against biting and is extracted from the work material. it can.

  As described above, also in the second embodiment, the rear input shaft 46 that can be attached to the tool holder 74 and the rear input shaft 46 and the front input shaft 53 are disposed in front of the rear input shaft 46 and the rear end of the bit 35 is integrally connected in the rotational direction. Torque transmitted from the front input shaft 53 to the output shaft 43 due to an increase in the load of the output shaft 43 provided between the output shaft 43 provided with the front mounting portion 3 at the front end and the front input shaft 53 and the output shaft 43. By using the attachment 40 provided with the striking mechanism 57 that causes intermittent striking in the rotational direction, the bit 35 that bites into the work material can be easily extracted using the hammer drill 70. Therefore, the work is interrupted for a short time, and the deterioration of workability is suppressed.

In the second aspect, the rotation of the rear input shaft is decelerated via the planetary gear reduction mechanism and transmitted to the front input shaft provided with the striking mechanism. However, since the deceleration is not essential, the reduction mechanism is Alternatively, a single input shaft in which the rear input shaft and the front input shaft are integrated may be employed.
The striking mechanism is formed with a hammer, coil spring, etc. As the striking mechanism, the spindle is pivotally supported by a cylindrical case filled with hydraulic oil, and the hydraulic pressure generated by the relative rotation of the case and the spindle is used to the spindle. A well-known oil unit (exemplified in Japanese Patent Application Laid-Open No. 2006-289596, Japanese Patent Application Laid-Open No. 2005-219139, etc.) that can generate instantaneous torque can also be used. That is, by connecting the input shaft to the case and providing the front mounting portion directly or indirectly on the spindle, the rotation to the input shaft can be converted into intermittent hits on the spindle and the bit can be extracted.

Further, also in the second embodiment, the structure of the front mounting portion and the input shaft can be appropriately changed in accordance with the shape of the shank portion of the bit and the configuration of the mounting portion of the rotary tool. It is also possible to limit the connection only to rotation without providing a stop mechanism.
On the other hand, the rotary tool is not limited to a hammer drill, and an electric drill, a driver, or the like can be used as long as it has a final output shaft to which the input shaft of the attachment can be connected.

  1 ・ ・ Attachment for impact tool, 2 ・ ・ Main shaft, 3 ・ ・ Front mounting part, 4 ・ ・ Rear mounting part, 6 ・ ・ Sleeve, 8 ・ ・ Insertion hole, 9 ・ ・ Ball, 11 ・ ・ Projection, 16 ・ ・ Pin, 20 ・ ・ Impact wrench, 25 ・ ・ Anvil, 26 ・ ・ Blowing mechanism, 35 ・ ・ Bit, 36 ・ ・ Shank part, 40 ・ ・ Attachment for rotary tool, 41 ・ ・ Case, 43 ・ ・ Output Axis 46 ··· Rear input shaft 53 ··· Front input shaft 57 · · Blow mechanism 58 · · Hammer 62 · Coil spring 70 · · Hammer drill 74 · · Tool holder 86 · · Mounting part

Claims (7)

An attachment for an impact tool used for an impact tool having a final output shaft that causes intermittent impact in the rotational direction,
A rear mounting portion that can be mounted on the final output shaft is provided at the rear portion of the main body shaft, while a front mounting portion that can integrally connect the rear end of another bit in the rotation direction is provided at the front portion of the main body shaft. Attachment for impact tool characterized by the above.   The impact tool attachment according to claim 1, wherein the front mounting portion further includes a retaining mechanism that integrally connects a rear end of the bit in the axial direction. A striking tool with a final output shaft that causes intermittent striking in the rotational direction,
A striking tool comprising the rear mounting portion of the striking tool attachment according to claim 1 or 2 attached to the final output shaft. A rotary tool attachment used for a rotary tool having a final output shaft that rotates,
An input shaft that can be mounted on the final output shaft, an output shaft that is disposed in front of the input shaft and includes a front mounting portion that can be connected to the rear end of another bit in the rotation direction, and the input A striking mechanism that is provided between the shaft and the output shaft, and causes an intermittent striking in the rotational direction to the torque transmitted from the input shaft to the output shaft due to an increase in the load of the output shaft. Attachment for rotating tools.   The rotary tool attachment according to claim 4, wherein the front mounting portion further includes a retaining mechanism that integrally connects a rear end of the bit in the axial direction.   The striking mechanism is connected to the input shaft so as to be able to rotate and move back and forth within a predetermined range, and engages the rear end of the output shaft in the rotational direction at the advanced position, and the hammer to the advanced position. An urging means for urging is provided, and intermittent hammering is generated by repeatedly engaging and disengaging the hammer with respect to a rear end of the output shaft due to an increase in load on the output shaft. Attachment for rotary tools of 4 or 5. A rotary tool with a rotating final output shaft,
A rotary tool comprising the rotary shaft attachment input shaft according to any one of claims 4 to 6 attached to the final output shaft.

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