JP2017087334A - Base shaft holder and electric power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base shaft holder capable of holding a base shaft inserted into a base shaft insertion hole at an accurate insertion position in an insertion direction, and an electric driver provided with the base shaft holder.SOLUTION: A bit holder 1 comprising a holder body 10 having a hexagonal insertion hole 11 into which the base shaft 6 of a rotary fixture 5 is inserted from a tip side, and a sleeve 40 fitted around the holder body 10 and movable in an axial direction is provided with: an alignment combination 30 that abuts against the outer surface of the base shaft 6 to align the base shaft; a tapered groove 53 of a guide ring 50 that guides the alignment combination 30 toward the radial center direction of the holder body 10 in synchronization following the movement of the sleeve 40 in the axial direction. At the base end of the hexagonal insertion hole 11, an alignment recess 14 that supports the base end part 8 of the inserted base shaft 6 in at least a used state is provided.SELECTED DRAWING: Figure 6

Description

  The present invention relates to, for example, a base holder for inserting and holding a base shaft of a rotating jig such as a driver bit or a drill bit, and an electric tool such as an electric driver provided with the base shaft holder.

Conventionally, as a base holder arranged at the tip of an electric screwdriver or the like, a base holder has been proposed in which the base of a held rotating jig does not come out carelessly (see Patent Document 1).
The base holder includes a holder main body having a base insertion hole through which a base of a rotating jig can be detachably inserted, and a through hole in which a steel ball to be locked in a locking groove formed on the outer surface of the base is movably disposed. , A steel ball disposed in the through hole, a cylindrical outer fitting member slidably fitted to the holder main body, and a spring for biasing the outer fitting member toward the proximal end side of the holder main body. ing.

  When the base shaft is inserted into the base shaft insertion hole of the base shaft holder, the outer fitting member causes the steel ball to protrude and retract from the inner peripheral surface of the base shaft insertion hole, and engages with the locking groove, so that the base shaft inserted into the base shaft insertion hole is not damaged. Prepared escape can be prevented.

  However, since the base insertion hole into which such a base shaft can be inserted is formed slightly larger than the base shaft, the insertion position and the insertion direction of the base shaft are slightly deviated from the center of rotation in the inserted state and in use. There was a fear. In particular, when forming a mark point (a pilot hole) with a drill bit, the insertion position of the base shaft may be displaced from the center of rotation.

  As described above, when the insertion position and the insertion direction of the base shaft are slightly deviated from the rotation center, the rotating rotating jig itself is also displaced from the rotation center, and the rotational force is applied to the screw, the hole member to be cut, etc. with high accuracy. I could not.

JP 2006-198755 A

  Therefore, an object of the present invention is to provide a base holder that can hold the base shaft inserted into the base shaft insertion hole in an accurate insertion position and insertion direction, and an electric driver including the base shaft holder.

  The present invention includes a holder main body having a base shaft insertion hole into which a base shaft of a rotating jig is inserted from the front end side, an external fitting member that is externally fitted to the holder body and is movable in the axial direction, A contact aligning means that contacts and aligns with the outer surface from at least three directions, and the contact aligning means synchronizes with the axial movement of the external fitting member to synchronize the base shaft insertion hole. A guide means for guiding toward the radial center direction, and a base end alignment support means for supporting the base end of the base shaft in an aligned state at least in a use state at a base end of the base shaft insertion hole. It is a provided base shaft holder.

The rotating jig may be a rotating drill bit, a plus or minus driver bit, and the base axis of the rotating jig is also called a tool shank.
The abutting alignment means may be a means for moving in the radial center direction to come into contact with the outer surface of the base shaft or a means for coming into contact with the outer surface of the base shaft by deformation such as extending in the radial center direction.

According to the present invention, the base shaft inserted into the base shaft insertion hole can be held at an accurate insertion position and insertion direction.
More specifically, the base end portion of the base shaft inserted into the base shaft insertion hole of the holder main body is supported in the aligned state by the base end portion aligning support means at least in use. Further, the contact alignment means guided in the radial center direction in synchronization with the guide means contacts the outer surface of the base shaft from at least three directions. Therefore, at least in the use state, the base end portion is supported in the alignment state by the base end portion alignment support means, and the base shaft on which the contact alignment means contacts at least three directions with respect to the outer surface is inserted into the support base shaft. The hole can be accurately aligned and held in the hole, that is, the base shaft inserted into the base shaft insertion hole can be held in an accurate insertion position and insertion direction.

  Note that aligning and supporting at least in the state of use is not only in the state of use with a rotating rotating jig acting, but also in the state of rotating and rotating in addition to the state of use. In addition to the state, alignment support is also included in an insertion state (normal state) where rotation is not performed.

As an aspect of the present invention, the contact aligning means is constituted by a moving contact aligning means that is movable in the radial direction, and the movable contact aligning means can be moved in the radial direction on the holder body. A position restricting portion that restricts the circumferential position and the axial position can be provided.
The moving contact aligning means may be a columnar body or a spherical body such as a steel ball as long as the circumferential position and the axial position can be regulated such that the position regulating section can move in the radial direction.

  According to the present invention, the circumferential position and the axial position of the moving contact aligning means with respect to the holder body are restricted by the position restricting portion, so that the base shaft inserted into the base shaft insertion hole can be stably and accurately inserted and inserted. Can be held in the wearing direction.

Further, as an aspect of the present invention, the moving contact aligning means can be constituted by a columnar body that is higher than the thickness in the radial direction of the position restricting portion and at least a radially outer side is a curved surface.
The columnar body may be a solid columnar shape or a hollow cylindrical shape, and may be a columnar shape or a polygonal columnar shape as long as the outer diameter side is a curved surface.

  By this invention, it can hold | maintain in the alignment state more reliably. More specifically, the guide means for guiding the moving contact aligning means toward the radial center moves in the axial direction as the outer fitting member moves in the axial direction, but the aligning means is a sphere. A force in a direction moving in the direction opposite to the axial movement of the guide means is applied to the base shaft that rolls with the axial movement of the guide means and contacts the spherical contact aligning means. Therefore, if the axial movement of the outer fitting member is a movement in the direction toward the proximal end portion of the base shaft, a force in the direction toward the distal end acts on the base shaft, and the base end alignment support means There is a possibility that the base end portion of the base shaft cannot be supported and the base shaft inserted into the base shaft insertion hole cannot be held in an accurate insertion position and insertion direction. On the other hand, in the case of the moving contact aligning means constituted by the columnar body, it does not roll as the guide means moves in the axial direction, but moves in the direction opposite to the axial movement of the guide means to the base axis. The power of will not act. Further, a columnar body that is higher than the thickness in the radial direction of the position restricting portion and has a curved surface at least on the outer diameter has little friction with the guiding means, and does not hinder the movement of the guiding means in the axial direction.

  Therefore, the moving contact aligning means that is configured by a columnar body that is higher than the thickness in the radial direction of the position restricting portion and that has at least a radially outer surface is a curved surface, and is disposed in the position restricting portion, moves in the axial direction of the guide means. The base end portion is inserted into the base shaft insertion hole, and the base end portion is supported by the base end portion aligning support means, and the outer surface of the base shaft is aligned by the moving contact aligning means so that the accurate insertion position and insertion direction can be obtained. Can be held in.

  Further, as an aspect of the present invention, the moving contact aligning means is composed of a synthetic columnar body having a columnar body disposed on the inner diameter side and a sphere disposed on the outer diameter side than the columnar body, and the synthetic columnar body The height of the body can be larger than the thickness of the position restricting portion in the radial direction.

  According to the present invention, since friction with the guide means is further reduced, the guide means can smoothly move in the axial direction. Therefore, the base shaft can be aligned by moving the outer fitting member smoothly in the axial direction and moving the synthetic columnar body toward the radial center.

As an aspect of the present invention, the synthetic columnar body may be provided with a biasing unit that biases the columnar body and the sphere in a direction in which the columnar body and the sphere are separated in the radial direction.
The urging means can be composed of an elastic body such as an O-ring or a spring.

  According to the present invention, the clearance between the columnar body and the sphere can be absorbed by the urging means, and the sphere urged by the urging means is brought into contact with the guide means, and the urging is performed. The columnar body biased by the means can be reliably brought into contact with the outer surface of the base shaft and aligned, and can be reliably held in an accurate insertion position and insertion direction.

Further, as an aspect of the present invention, the guide means has a variable width that is gradually narrowed along the axial direction and along the moving direction of the outer fitting member, and the outer diameter of the moving contact aligning means is locked. It can be composed of grooves.
The width gradually decreases along the moving direction of the outer fitting member described above. For example, when the outer fitting member moves from the distal end side to the proximal end side, the width gradually decreases from the distal end side toward the proximal end side. To become.

  According to the present invention, it is possible to adjust the amount of movement of the moving contact aligning means by the guide means in the radial center direction without increasing the thickness of the guide means. More specifically, in the case where the guide means for moving the moving contact aligning means in the radial center direction is configured with a tapered surface, if the amount of movement in the radial center direction increases, the radial thickness of the guide means increases. In the case of the guide means constituted by the variable width groove that the outer diameter of the moving contact aligning means is locked, by adjusting the groove width and the change rate of the groove width, without increasing the thickness of the guide means, A desired amount of movement can be ensured.

As an aspect of the present invention, the variable width groove can gradually change in the circumferential direction along the axial direction.
To gradually change in the circumferential direction along the above-described axial direction refers to an appropriate curve such as a spiral shape or an S shape, or a straight line that intersects the axial direction.

  According to this invention, even when the amount of axial movement of the outer fitting member is small, that is, when the axial length of the guide means cannot be ensured, the outer member gradually changes in the circumferential direction along the axial direction. By doing so, the amount of movement by the guide means can be increased, and the amount of movement of the moving contact aligning means by the guide means in the radial center direction can be increased without increasing the thickness of the guide means.

Further, as an aspect of the present invention, a circumferential variable width groove extending in the circumferential direction can be continuously arranged at a terminal portion in the moving direction of the variable width groove.
According to the present invention, even when the amount of axial movement of the outer fitting member is small, the amount of movement by the guide means is further increased, and the moving contact alignment by the guide means is increased without increasing the thickness of the guide means. The amount of movement of the means in the radial center direction can be further increased.

As an aspect of the present invention, the guide means can be configured separately from the external fitting member.
According to the present invention, it is possible to configure a guide means that is rotatable with respect to the outer fitting member.

As an aspect of the present invention, a relative rotation restricting means for restricting relative rotation between the guide means and the external fitting member can be provided.
According to the present invention, the relative rotation of the guide means configured to be rotatable with respect to the outer fitting member can be restricted by the relative rotation restricting means.

  Further, as an aspect of the present invention, a slip-off preventing means that locks in a radial direction with respect to a locking groove provided in the base shaft to prevent the base shaft inserted into the base shaft insertion hole, and the external fitting A reverse direction urging means for urging the member in a direction opposite to the moving direction in the axial direction, and the outer fitting member is provided with the escape preventing means on the radially inner side as the moving direction moves. Pressing means is provided, and the abutting alignment means can be arranged on the distal end side with respect to the withdrawal preventing means.

  According to the present invention, the base shaft inserted into the base shaft insertion hole can be prevented from coming out, and the base shaft can be more accurately compared to the case where the contact aligning means is disposed on the base end side from the come-out preventing means. Can be well aligned.

According to another aspect of the present invention, there is provided an electric tool including a drive device and a rotation transmission unit that transmits the rotational force of the drive device to an axis, and the above-described base shaft holder is rotatably provided by the rotation transmission unit. It is characterized by being.
According to this invention, the base shaft is aligned, and the rotating jig held at the correct insertion position and insertion direction can be rotated.

  According to the present invention, it is possible to provide a base shaft holder that can hold the base shaft inserted into the base shaft insertion hole in an accurate insertion position and insertion direction, and an electric driver including the base shaft holder.

The front view of the electric tool provided with the base holder. The perspective view of a base-axis holder. The exploded explanatory drawing which wrote together the front and back, each side surface, and cross section of each component of a basic shaft holder. Explanatory drawing by the exploded perspective view of each component of a basic shaft holder. Explanatory drawing of alignment combination. Explanatory drawing by the longitudinal cross-sectional view of a base-axis holder. Explanatory drawing by the perspective view of the sleeve in the base shaft holder of another embodiment, and a holder main body. Explanatory drawing about the spiral slit of the holder main body in the base-axis holder of another embodiment.

An embodiment of the present invention will be described below in detail with reference to the drawings.
FIG. 1 shows a front view of an electric tool K provided with a bit holder 1, and FIG. 2 shows a perspective view of the bit holder 1. In FIG. 2, a part of the base end side of the base shaft 6 inserted into the hexagon insertion hole 11 is illustrated.

FIG. 3 shows an exploded explanatory view in which the front and rear surfaces, side surfaces and cross-sections of each component of the bit holder 1 are shown.
Specifically, the holder body 10 shows a longitudinal sectional view, a sectional view of the position of the retaining hole 12, and a sectional view of the position of the alignment hole 13, and the retaining ball 20 shows a side view arranged in two directions. The combination 30 shows a side view and a front view arranged in three directions, the sleeve 40 shows a longitudinal sectional view and a front view, the guide ring 50 and the stop ring 70 show a longitudinal sectional view and a rear view, and the spring 60 A side view and a front view are shown.

  FIG. 4 shows an explanatory view of each component of the bit holder 1 in an exploded perspective view. Specifically, FIG. 4 (a) shows an exploded perspective view from the front side of each component of the bit holder 1, and FIG. 4 (b) shows an exploded perspective view from the back side of each component of the bit holder 1. ing.

  FIG. 5 is an explanatory diagram of the alignment combination 30. Specifically, FIG. 5A shows a longitudinal sectional view of the alignment combination 30, FIG. 5B shows an exploded perspective view of the alignment combination 30, and FIG. 5C shows a perspective view of the alignment combination 30. Yes. In FIGS. 5B and 5C, a part of the front side is notched for easy understanding of the structure of the ball box 33.

  FIG. 6 shows an explanatory diagram of a state in which the rotating jig 5 is attached to the bit holder 1, that is, a state in which the base shaft 6 is inserted and held in the bit holder 1. Specifically, FIG. 6 (a) shows a longitudinal sectional view before inserting the base shaft 6 into the bit holder 1, FIG. 6 (b) shows a longitudinal sectional view of the state in which the base shaft 6 is inserted, and FIG. 6 (c). Fig. 2 shows a longitudinal sectional view of the rotating jig 5 in use. Further, FIG. 6D shows an enlarged view of part a in FIG. 6C, FIG. 6E shows an enlarged view of part b in FIG. 6C, and FIG. 6F shows FIG. The c section enlarged view in FIG.

  The bit holder 1 of the present invention is provided at the tip of the electric tool K. For example, the electric power tool K includes a housing 2 provided with a handle portion 2a that is gripped by a user during use, a motor M arranged in the housing 2 and capable of rotating in the forward and reverse directions, and a rotation transmission mechanism (not shown). ing.

  The bit holder 1 is disposed in front of the housing 2 and holds the base shaft 6 of the rotating jig 5. By operating the trigger 2b disposed on the handle portion 2a, the rotational driving force of the motor M installed in the housing and capable of rotating in the forward and reverse directions is transmitted by the rotation transmission mechanism, and the bit holder 1 rotates. is there.

  Before describing the bit holder 1, the rotating jig 5 held by the bit holder 1 will be described. As shown in FIGS. 2 and 6, the base shaft 6 on the base end side of the rotating jig 5 such as a driver bit or a drill bit has a hexagonal shape when viewed from the back, and a locking groove 7 that is an arc-shaped groove in the longitudinal section is formed. It is formed in the circumferential direction, and the base end portion 8 of the base shaft 6 is chamfered.

  As shown in FIGS. 3 and 4, the bit holder 1 equipped in the electric tool K described above includes a holder body 10, a retaining ball 20, an alignment combination 30, a sleeve 40, a guide ring 50, and a spring 60, which are main components. And the stop ring 70 is assembled. In FIG. 3, the holder body 10 side is the proximal end side, the stop ring 70 side is the distal end side, and the direction connecting the proximal end side and the distal end side is the axial direction.

  The holder body 10 has a substantially cylindrical shape with a flange 15 extending radially outward on the base end side, and a hexagonal insertion hole 11 is formed in the inside from the front end side to about half of the length, and the alignment hole 13 from the front end side. And a retaining hole 12 are formed. Furthermore, an engagement groove 16 that engages a stop ring 70 described later is provided on the outer surface of the front end side of the holder body 10.

  The hexagonal insertion hole 11 is a hexagonal sectional hole in front view with the distal end open, and a conical alignment recess 14 convex rearward is formed at the proximal end of the hexagonal insertion hole 11. The hexagon insertion hole 11 has a hexagonal cross section slightly larger than the base shaft 6 because the base shaft 6 is inserted.

  The retaining hole 12 is a radial through hole that fits a retaining ball 20 to be described later so as to be movable in the radial direction, and communicates the radially outer side of the holder body 10 and the hexagonal insertion hole 11, and is opposed in the circumferential direction. It is provided in two places. The retaining hole 12 is formed with a diameter slightly larger than the retaining ball 20 to be fitted. Further, a stopper is provided on the inner side of the retaining hole 12 so that the retaining ball 20 fitted therein does not fall into the hexagonal insertion hole 11.

  The alignment hole 13 is a radial through hole that fits an alignment combination 30 to be described later so as to be movable in the radial direction, and communicates the outer diameter side of the holder body 10 and the hexagonal insertion hole 11 at regular intervals in the circumferential direction. It is established in three places.

  The alignment hole 13 is formed with a diameter slightly larger than the ball box 33 in the alignment combination 30 to be fitted. Moreover, the three places provided at equal intervals in the circumferential direction are formed at locations corresponding to the plane portion of the hexagonal insertion hole 11 having a hexagonal cross section. Further, a stopper is provided inside the alignment hole 13 so that the fitted alignment combination 30 does not fall into the hexagonal insertion hole 11.

  The retaining balls 20 that are fitted into the retaining holes 12 of the holder body 10 are steel balls that are retained in the retaining grooves 7 formed in the base shaft 6, and two are provided in accordance with the number of retaining holes 12. . The retaining ball 20 is formed with a diameter smaller than the arc diameter of the locking groove 7 as shown in FIG.

  As shown in FIG. 5, the alignment combination 30 fitted in the alignment hole 13 of the holder body 10 includes an alignment ball 31, an O-ring 32, and a ball box 33.

The alignment ball 31 is a steel ball formed with a diameter that engages with a tapered groove 53 of a guide ring 50 described later.
The O-ring 32 is a rubber ring and has an outer diameter substantially the same as that of the alignment ball 31. The O-ring 32 may be made of not only rubber but also a material having appropriate elasticity such as a synthetic resin O-ring such as silicone or a spring.

  The ball box 33 has a bottomed cylindrical shape, and the upper side is opened in FIG. 5 to form an accommodation space 34 for accommodating the alignment ball 31 and the O-ring 32, and in FIG. A projecting abutment projection 35 is provided. In addition, a conical concavity 36 that is convex downward is formed in the bottom surface of the accommodation space 34 so that the alignment ball 31 can be accommodated therein.

  The accommodation space 34 is formed with a diameter larger than that of the alignment ball 31, and is formed with a height at which the alignment ball 31 accommodated in the accommodation space 34 protrudes from above.

  Such an alignment ball 31, O-ring 32, and ball box 33 are assembled by accommodating the O-ring 32 and the alignment ball 31 in this order in the accommodation space 34 of the ball box 33, thereby forming an alignment combination 30.

  In the assembled alignment combination 30, the alignment ball 31 protrudes from above the ball box 33, and the alignment ball 31 accommodated in the accommodation space 34 is elastically supported by the O-ring 32, and has an elastic O-ring 32. Can absorb the clearance.

  Three alignment combinations 30 configured in this manner are provided in accordance with the number of alignment holes 13 of the holder body 10, and the alignment balls 31 are fitted into the alignment holes 13 in the direction of the radially outer side.

  The sleeve 40 has a cylindrical shape that is externally fitted to the holder body 10 from the distal end side, and includes a distal end side space 41 and a proximal end side space 42 that is smaller in diameter than the distal end side space 41 and communicates with the distal end side space 41. Is formed. In addition, a part of the proximal end side space 42 on the distal end side is reduced in diameter, and a pressing portion 43 that presses the retaining ball 20 in the radial center direction is formed.

  The guide ring 50 is disposed in the distal end side space 41 of the sleeve 40, and includes a ring main body 51 that is externally fitted to the holder body 10 from the distal end side of the sleeve 40, and a ring flange 52 that extends radially outward at the base end of the ring main body 51. The taper groove 53 of the axial direction is provided in three places at equal intervals in the circumferential direction on the inner surface of the ring main body 51.

  The taper groove 53 is an arc groove having substantially the same diameter as the alignment ball 31 of the alignment combination 30 described above, and is formed so as to gradually become deeper from the distal end side toward the proximal end side. The ring flange 52 is formed to be slightly smaller in diameter than the distal end side space 41, and the ring main body 51 is formed to have a diameter that is spaced from the surface of the distal end side space 41 so that a spring 60 described later can be accommodated.

The spring 60 is a coil spring that is disposed between the outer surface of the ring main body 51 disposed in the distal end side space 41 and the inner surface of the distal end side space 41 and biases in the axial direction.
The stop ring 70 is a C ring that engages with an engagement groove 16 provided at the tip of the holder body 10.

The bit holder 1 in which each element is configured as described above is assembled as described below.
First, the alignment ball 31 and the O-ring 32 are accommodated in the accommodation space 34 of the ball box 33, and the three alignment combinations 30 are assembled and fitted into the alignment holes 13 of the holder body 10, and the two retaining balls 20 are attached. Fit into the retaining hole 12.

Further, the guide ring 50 is press-fitted and fixed to the distal end side space 41 from the distal end side of the sleeve 40, and the guide ring 50 is assembled to the sleeve 40.
In this state, the sleeve 40 is externally fitted from the front end side of the holder body 10. At this time, the sleeve 40 is externally fitted in the taper groove 53 of the guide ring 50 assembled to the sleeve 40 in the direction in which the alignment ball 31 of the alignment combination 30 fitted in the alignment hole 13 is engaged. Then, the sleeve 40 is moved to the proximal end side in the axial direction until the pressing portion 43 contacts the retaining ball 20 fitted in the retaining hole 12.

  Further, the guide ring 50 is assembled, and the spring 60 is inserted between the inner surface of the distal end side space 41 and the outer surface of the ring main body 51 from the distal end side of the sleeve 40 that is externally fitted to the holder body 10, and the proximal end side. The stop ring 70 is engaged with the engagement groove 16 of the holder body 10 in a state where the spring 60 is contracted toward the end, and the assembly of the bit holder 1 is completed. This state is the normal state of the bit holder 1 (see FIG. 6A).

  In the bit holder 1 assembled in this way, the spring 60 is sandwiched between the ring flange 52 of the guide ring 50 on the proximal end side and the stop ring 70 on the distal end side, and is fixed to the holder body 10. As a reaction force, the ring flange 52 is urged toward the base end side. In other words, the spring 60 biases the sleeve 40 toward the proximal end side with respect to the holder body 10 via the stop ring 70 and the guide ring 50.

  Therefore, the sleeve 40 to which the guide ring 50 is press-fitted and fixed is assembled so as to be movable toward the distal end side with respect to the holder body 10 against the biasing force of the spring 60, and in a normal state, the sleeve 40 is pressed by the biasing force of the spring 60. The sleeve 40 is positioned on the proximal end side where the pressing portion 43 contacts the retaining ball 20.

  Further, the alignment combination 30 in which the alignment ball 31 engages with the tapered groove 53 of the guide ring 50 press-fitted and fixed to the sleeve 40 that is movable in the axial direction is formed by the tapered groove 53 as the guide ring 50 moves to the proximal end side. It will be pressed to the diameter center side (refer to Drawing 6 (f)).

  At this time, the O-ring 32 that elastically supports the alignment ball 31 in the accommodation space 34 is crushed by pressing by the taper groove 53, and the alignment ball 31 comes into contact with the conical recess 36 formed on the bottom surface of the accommodation space 34. The box 33 is pushed toward the center of the diameter.

Next, a case where the rotating jig 5 is held with respect to the bit holder 1 in a normal state will be described.
In the normal state described above, the retaining ball 20 fitted in the retaining hole 12 abuts against the pressing portion 43 of the sleeve 40 and is pressed toward the center of the diameter. It protrudes into the hole 11 and interferes with the insertion of the base shaft 6.

  Therefore, as shown in FIG. 6B, in order to insert into the hexagon insertion hole 11 of the bit holder 1, first, the sleeve 40 is once moved to the tip side against the urging force of the spring 60. As the sleeve 40 moves, the contact between the pressing portion 43 and the retaining ball 20 is eliminated, and the retaining ball 20 is guided to the base end portion 8 and moves to the outside of the diameter, so that the base shaft 6 can be inserted. .

  However, the retaining ball 20 that has been guided by the base end portion 8 and moved to the outside of the diameter is pressed toward the center of the diameter by the pressing portion 43 of the sleeve 40 that is always biased to the base end side by the spring 60. The insertion of the base shaft 6 is allowed in a manner along the outer surface of the base shaft 6.

  At this time, the alignment combination 30 fitted in the alignment hole 13 also becomes deeper in the taper groove 53 with the movement of the distal end side of the sleeve 40, that is, can move to the outer diameter side. Since it moves while being guided, it does not hinder the insertion of the base shaft 6 (see FIG. 6B).

  When the base shaft 6 is inserted to the position where the locking groove 7 is located with respect to the retaining ball 20, the retaining ball 20 that is pressed toward the center of the diameter by the pressing portion 43 of the sleeve 40 that is always urged toward the proximal end by the spring 60. The base shaft 6 is moved in the radial center direction and engaged with the locking groove 7, and the base shaft 6 inserted into the hexagonal insertion hole 11 is moved to the distal end side, that is, the base shaft 6 is prevented from being accidentally pulled out.

  In this state, the pressing portion 43 abuts, and the sleeve 40 that moves the retaining ball 20 in the radial center direction to engage with the locking groove 7 moves to the proximal side by the biasing force of the spring 60. With the tapered groove 53 of the guide ring 50 moved to the base end side together with the sleeve 40, the alignment combination 30 is also moved to the radial center side so as to press the outer surface of the base shaft 6 by the contact convex portion 35.

  At this time, the O-ring 32 that elastically supports the alignment ball 31 in the accommodation space 34 is crushed by the pressing force of the tapered groove 53, that is, functions as a cushioning material until the alignment ball 31 directly contacts the conical recess 36 of the ball box 33. Therefore, the alignment combination 30 can be smoothly moved toward the center of the diameter so that the outer surface of the base shaft 6 is pressed by the contact protrusion 35 by the tapered groove 53 of the guide ring 50.

  Since the alignment combination 30 fitted in each of the three alignment holes 13 moves in the radial center direction synchronously, the spring 60 is held in a state of being pressed from the three directions toward the radial center.

  Further, in the inserted state of the base shaft 6 with the retaining ball 20 engaged with the locking groove 7, the base end portion 8 of the base shaft 6 contacts the alignment recess 14 of the hexagonal insertion hole 11 (see FIG. 6C). Alternatively, it is arranged in the vicinity of the aligning recess 14.

  Temporarily, in the inserted state of the base shaft 6 with the retaining ball 20 engaged with the locking groove 7, the base end portion 8 of the base shaft 6 does not contact the aligning recess 14 of the hexagonal insertion hole 11, and the aligning recess 14 Even in the state of being disposed in the vicinity, the diameter of the retaining ball 20 is smaller than the arc diameter of the locking groove 7, so that even if the retaining ball 20 is engaged with the locking groove 7, the base shaft 6 Is held in a state where it can be moved slightly in the axial direction. Therefore, in the state of use, the rotating jig 5 is subjected to a force that is pressed to the base end side, and as shown in FIG. The end 8 always contacts the aligning recess 14.

  As shown in FIG. 6C, when the base end portion 8 and the aligning recess 14 come into contact with each other, the chamfered base end portion 8 is convex toward the base end. And is supported in an aligned state.

  As described above, the holder body 10 having the hexagonal insertion hole 11 into which the base shaft 6 of the rotating jig 5 is inserted from the front end side, the sleeve 40 that is externally fitted to the holder body 10 and is movable in the axial direction, The alignment combination 30 that contacts and aligns with the outer surface of the base shaft 6 from at least three directions, and the alignment combination 30 is synchronized with the axial movement of the sleeve 40 toward the radial center of the holder body 10. The bit holder 1 is provided with a taper groove 53 of a guide ring 50 that guides the guide ring 50 and is provided with a centering recess 14 that supports the base end 8 of the base shaft 6 in a centering state at the base end of the hexagonal insertion hole 11. The base shaft 6 inserted into the hexagonal insertion hole 11 can be held at the correct insertion position and insertion direction.

  More specifically, the base end portion 8 of the base shaft 6 inserted into the hexagonal insertion hole 11 of the holder body 10 is supported in a centering state by the centering recess 14 at least in use. The alignment combination 30 guided in the radial center direction in synchronization with the tapered groove 53 of the guide ring 50 abuts on the outer surface of the base shaft 6 from three directions.

  Accordingly, in use, the base end portion is supported in the aligned state by the aligning recess 14, and the base shaft 6 with which the alignment combination 30 contacts the outer surface from the three directions is accurately aligned and held in the hexagonal insertion hole 11. That is, the base shaft 6 inserted into the hexagonal insertion hole 11 can be held in the correct insertion position and insertion direction.

  Further, by providing the holder body 10 with the alignment hole 13 that regulates the circumferential position and the axial position so that the alignment combination 30 can be moved in the radial direction, the circumferential position and the axial direction of the alignment combination 30 with respect to the holder body 10. Since the position is regulated by the alignment hole 13, the base shaft 6 inserted into the hexagonal insertion hole 11 can be stably and accurately held in the insertion position and the insertion direction.

  Further, the columnar alignment combination 30 that is higher than the radial thickness of the alignment hole 13 and includes the alignment ball 31 on the outer diameter side can be more reliably held in an aligned state.

  More specifically, the taper groove 53 of the guide ring 50 that guides the alignment combination 30 toward the radial center also moves in the axial direction as the sleeve 40 moves in the axial direction, but the alignment combination that functions as a centering means. When a steel ball that rolls instead of 30 is used, the taper groove 53 of the guide ring 50 rolls along with the axial movement of the tapered groove 53, and the base shaft 6 with which the steel ball abuts has a taper groove 53 of the guide ring 50. A force in a direction moving in the direction opposite to the axial movement is applied.

  Therefore, since the sleeve 40 moves in the axial direction from the distal end side toward the proximal end side in order to hold the base shaft 6 while aligning, a force in the direction toward the distal end side acts on the base shaft 6, and alignment is performed. There is a possibility that the base end portion 8 of the base shaft 6 cannot be supported by the recess 14 and the base shaft 6 inserted into the hexagonal insertion hole 11 cannot be held in the correct insertion position and insertion direction.

  On the other hand, the columnar alignment combination 30 having the alignment balls 31 on the outer diameter side does not roll with the axial movement of the taper groove 53 of the guide ring 50, and the taper groove of the guide ring 50 on the base shaft 6. The force in the direction moving in the direction opposite to the axial movement of 53 does not act. Accordingly, the base end portion 8 can be supported in the aligned state by the aligning recess 14.

  Further, the columnar alignment combination 30 having an alignment ball 31 on the outer diameter side, which is larger than the radial thickness of the alignment hole 13, has less friction with the tapered groove 53 of the guide ring 50, and the tapered groove 53 of the guide ring 50 has a smaller friction. There is no hindrance to the axial movement.

  Therefore, the columnar alignment combination 30 that is higher than the radial thickness of the alignment hole 13 and includes the alignment ball 31 on the outer diameter side is inserted into the hexagonal insertion hole 11 by the axial movement of the tapered groove 53 of the guide ring 50. Then, the outer surface of the base shaft 6 with the base end portion 8 supported by the aligning recess 14 is pressed and aligned by the alignment combination 30 and can be held in an accurate insertion position and insertion direction.

  The alignment combination 30 having the ball box 33 arranged on the inner diameter side and the alignment ball 31 arranged on the outer diameter side from the ball box 33 has a height larger than the radial thickness of the alignment hole 13. In addition, since the friction with the tapered groove 53 of the guide ring 50 is further reduced, the tapered groove 53 of the guide ring 50 can smoothly move in the axial direction. Therefore, the base shaft 6 can be aligned by moving the sleeve 40 smoothly in the axial direction and moving the alignment combination 30 toward the radial center.

Further, by providing the alignment combination 30 with an O-ring 32 that urges the ball box 33 and the alignment ball 31 in a direction away from each other in the radial direction, the clearance is absorbed and the alignment ball 31 that is urged by the O-ring 32. Is reliably brought into contact with the tapered groove 53 of the guide ring 50, and the contact convex portion 35 of the ball box 33 urged by the O-ring 32 is reliably brought into contact with the outer surface of the base shaft 6 for alignment. It is possible to hold in an accurate insertion position and insertion direction.
Further, by forming the guide ring 50 having the tapered groove 53 separately from the sleeve 40, the sleeve 40 having a tapered surface can be configured.

  Further, a retaining ball 20 that is locked in a radial direction with respect to a locking groove 7 provided in the base shaft 6 to prevent the base shaft 6 inserted into the hexagonal insertion hole 11 from slipping out, and a sleeve 40 in the axial direction. An O-ring 32 that is biased in the direction opposite to the moving direction is provided, and the sleeve 40 is provided with a pressing portion 43 that presses the retaining ball 20 inward in the diameter in accordance with the movement in the moving direction. 13 and the alignment combination 30 are arranged on the front end side with respect to the retaining ball 20 so that the base shaft 6 inserted into the hexagonal insertion hole 11 can be prevented from slipping out, and the alignment hole 13 and the alignment combination 30 are retained. Compared to the case where the ball 20 is disposed on the base end side, the base shaft 6 can be aligned and held with higher accuracy.

  Next, a bit holder 1a according to another embodiment will be described with reference to FIGS. FIG. 7 is an exploded perspective view of the sleeve 140 and the guide ring 150 in the bit holder 1a of another embodiment, and FIG. 8 is an explanatory view of the spiral slit 153 and the alignment combination 30.

  Specifically, FIG. 7A shows an exploded perspective view from the front side of the sleeve 140 and the guide ring 150, and FIG. 7B shows an exploded perspective view from the back side of the sleeve 140 and the guide ring 150. .

  8 (a) shows an enlarged development view of the spiral slit 153, FIG. 8 (b) shows an enlarged development view of the axial slit 253, and FIG. 8 (c) shows an enlarged development view of the L-shaped slit 353. 8D shows an enlarged cross-sectional view of the spiral slit 153 and the alignment combination 30 in the use state, and FIG. 8E shows an enlarged cross-sectional view of the spiral slit 153 and the alignment combination 30 in the insertion state. .

  In the bit holder 1a of another embodiment, the configurations of the sleeve 40 and the guide ring 50 in the bit holder 1 are different, and the other configurations are the same as those of the bit holder 1. In addition, the same code | symbol is used about the same structure, Since it is the same about the structure and effect, it abbreviate | omits.

  The guide ring 150 corresponding to the guide ring 50 is composed of the ring main body 151 and the ring flange 152 as in the case of the guide ring 50, but instead of the tapered groove 53 formed on the inner surface of the ring main body 51 as shown in FIG. Are provided with a spiral slit 153 and a rear gear 154 in which radial teeth are arranged in the circumferential direction on the proximal end surface of the ring flange 152.

The spiral slit 153 is a spiral slit that penetrates the ring main body 151 in the radial direction, changes mainly in the axial direction, and changes in the circumferential direction, and the groove width changes in the axial direction.
Specifically, as shown in FIG. 8A, the spiral slit 153 has a spiral shape that changes in the circumferential direction while the groove width gradually decreases from the proximal end side toward the distal end side. Even on the wide base end side, the width is narrower than the diameter of the alignment ball 31. In the present embodiment, the spiral slit 153 is formed in a spiral shape that changes in the right direction when viewed from the front side, but may have a spiral shape that changes in the left direction.

  As shown in FIG. 7, in the sleeve 140, radial teeth are arranged in the circumferential direction on the distal end side surface of the boundary portion between the distal end side space 141 and the proximal end side space 142 facing the back gear 154 of the guide ring 150. A front gear 144 is provided.

In the bit holder 1a configured by assembling the sleeve 140 and the guide ring 150 together with other elements, the back surface is different from the bit holder 1 in which the guide ring 50 is press-fitted and fixed in the distal end side space 41. The guide ring 150 is inserted into the front end space 141 so that the gear 154 faces the front gear 144.
Then, the alignment ball 31 of the alignment combination 30 is engaged with the spiral slit 153.

  In the bit holder 1a configured by assembling the sleeve 140 and the guide ring 150 together with other elements in this manner, the spring 60 biases the ring flange 152 toward the proximal end side with the stop ring 70 as a reaction force. In a normal state or the like, the rear gear 154 and the front gear 144 are engaged with each other while the axial urging force of the spring 60 is applied, and the relative rotation in the circumferential direction of the guide ring 150 with respect to the sleeve 140 is restricted. .

  In such a bit holder 1 a, when the sleeve 140 is moved to the distal end side in order to insert the base shaft 6 into the hexagonal insertion hole 11 as in the bit holder 1, the distal end side together with the sleeve 140 is resisted against the urging force of the spring 60. As shown in FIG. 8E, the alignment combination 30 in which the alignment ball 31 is engaged with the spiral slit 153 of the guide ring 150 that has moved to the width of the spiral slit 153 widens as shown in FIG. It is guided and moves to the outside of the diameter.

  When the retaining ball 20 engages with the locking groove 7 and the sleeve 140 moves to the proximal end side, the spiral slit 153 of the guide ring 150 that moves to the proximal end side together with the sleeve 140 has a groove width toward the distal end side. Therefore, the alignment combination 30 moves in the radial center direction, and the contact projection 35 is pressed against the outer surface of the base shaft 6, so that the base shaft 6 can be aligned.

  Here, since the alignment ball 31 of the alignment combination 30 is engaged with the spiral spiral slit 153 along with the movement of the guide ring 150 on the proximal end side, the guide ring 150 spirals with respect to the holder body 10. To try to rotate relative to the circumferential direction. However, since the front gear 144 and the rear gear 154 to which the urging force of the spring 60 acts are engaged, the sleeve 140 also rotates relative to the holder body 10 in the circumferential direction together with the guide ring 150.

  Further, by rotating the sleeve 140 in the circumferential direction, the alignment ball 31 engaged with the spiral slit 153 of the guide ring 150 in which the front gear 144 and the rear gear 154 are engaged by the urging force of the spring 60 causes the alignment ball 31 to engage with the spiral slit 153. Move along.

  When the sleeve 140 is further rotated in the circumferential direction from the state in which the alignment combination 30 has moved to the end of the spiral slit 153, the sleeve 140 and the front gear 144 against the biasing force of the spring 60 against the guide ring 150. The meshing with the rear gear 154 is released and it moves in the circumferential direction.

  At this time, the user has moved the alignment combination 30 to the end of the spiral slit 153 by the click sound when the front gear 144 and the rear gear 154 on which the urging force of the spring 60 is applied, that is, the most alignment. It can be recognized that the combination 30 has been moved toward the center of the diameter.

  Although the spiral slit 153 is formed in a spiral shape, as shown in FIG. 8B, the groove width changes in the axial direction depending on the relationship between the radial movement amount of the alignment combination 30 and the slit length. It may be formed by an axial slit 253 that is an axial slit, and as shown in FIG. 8C, the developed shape having a circumferential groove 353a in the circumferential direction at the end on the tip side is L-shaped. The L-shaped slit 353 may be used.

  Thus, since the spiral slit 153 with which the alignment ball 31 of the alignment combination 30 is engaged is a slit that gradually narrows along the moving direction of the sleeve 140 along the axial direction, the thickness of the guide ring 150 is reduced. The amount of movement of the alignment combination 30 in the radial center direction by the spiral slit 153 of the guide ring 150 can be adjusted without increasing the thickness.

  More specifically, in the case where the guide ring 150 that moves the alignment combination 30 in the radial center direction is provided with a tapered surface as a guide means, the radial thickness of the guide ring 150 increases as the movement amount in the radial center direction increases. However, in the case of the spiral slit 153 (the axial slit 253, the L-shaped slit 353) that the alignment ball 31 of the alignment combination 30 is engaged with, the thickness of the guide ring 150 is adjusted by adjusting the groove width and the change rate of the groove width. A desired amount of movement can be ensured without forming the film thickly.

  Further, when the spiral slit 153 (L-shaped slit 353) gradually changes in the circumferential direction along the axial direction, the amount of movement of the sleeve 140 in the axial direction is small, that is, the slit length is short. However, the slit length is increased by gradually changing in the circumferential direction along the axial direction, and without increasing the thickness of the guide ring 150, the spiral slit 153 of the guide ring 150 in the radial center direction of the alignment combination 30 is provided. The amount of movement can be increased.

  Further, by continuously arranging a circumferential groove 353a extending in the circumferential direction at the end portion in the moving direction of the axial slit, the slit length can be further increased even when the axial slit length is short. Thus, the amount of movement of the alignment combination 30 in the radial center direction by the spiral slit 153 of the guide ring 150 can be further increased without increasing the thickness of the guide ring 150.

  Further, by separately configuring the guide ring 150 having the spiral slit 153 and the sleeve 140, the guide ring 150 can be rotatably mounted on the sleeve 140.

  Further, by providing the front gear 144 and the rear gear 154 that restrict the relative rotation between the sleeve 140 and the guide ring 150, the relative rotation of the guide ring 150 that is rotatably assembled to the sleeve 140 can be controlled. It can be regulated at 154.

In the correspondence between the configuration of the present invention and the above-described embodiment, the base shaft insertion hole of the present invention corresponds to the hexagonal insertion hole 11,
Similarly,
The holder body corresponds to the holder body 10,
The outer fitting member corresponds to the sleeve 40, 140,
The contact aligning means, the moving contact aligning means, and the composite columnar body correspond to the alignment combination 30.
The guide means corresponds to the tapered groove 53 of the guide ring 50 and the spiral slit 153 of the guide ring 150,
The proximal end alignment support means corresponds to the alignment recess 14;
The base holder corresponds to the bit holder 1,
The position restricting part and the sphere correspond to the alignment ball 31,
The columnar body corresponds to the ball box 33,
The biasing means corresponds to the O-ring 32,
The variable width grooves correspond to the spiral slit 153, the axial slit 253 and the L-shaped slit 353,
The circumferential variable width groove corresponds to the circumferential groove 353a,
The relative rotation restricting means corresponds to the front gear 144 and the rear gear 154,
The escape prevention means corresponds to the retaining ball 20,
The reverse biasing means corresponds to the spring 60,
The pressing means corresponds to the pressing portion 43,
The driving device corresponds to the motor M,
Although the electric tool corresponds to the electric tool K, the present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

For example, the bit holder 1 described above may be mounted not only on the electric tool K but also on a rotating electric tool such as a vibration drill or an electric screwdriver.
Further, the sleeve 40 and the guide ring 50 may be integrally configured.

  The tapered groove 53 is formed along the axial direction. However, the tapered groove 53 may be formed in a spiral shape like the spiral slit 153, or may be formed by extending the end portion in the circumferential direction like the L-shaped slit 353. . Thereby, the same effect as the spiral slit 153 and the L-shaped slit 353 with respect to the axial slit 253 can be obtained.

  In the above description, when the base shaft 6 is inserted into the hexagonal insertion hole 11, the sleeve 40 (140) is moved from the proximal end side to the distal end side, but may be moved from the distal end side to the proximal end side. In this case, the spring 60 biases the sleeve 40 toward the distal end side with respect to the holder body 10.

  In this case, a steel ball may be used instead of the alignment combination 30. More specifically, in order to move the sleeve 40 moved to the proximal end side toward the distal end side to be in a holding state, that is, the proximal end of the base shaft 6 is formed by a steel ball rolling in the tapered groove 53 (spiral slit 153). The force toward the side acts, and the base end portion 8 can be more reliably supported by the hexagonal insertion hole 11 in the aligned state. Therefore, steel balls may be used instead of the alignment combination 30.

  The alignment combination 30 described above is configured by assembling the alignment ball 31, the O-ring 32, and the ball box 33, but a spring may be assembled instead of the O-ring 32, and the alignment ball is not used without using the O-ring 32. The alignment combination 30 may be constituted by 31 and the ball box 33.

  Further, the alignment ball 31 is on the inner diameter side and the ball box 33 is on the outer diameter side, that is, the alignment is such that the ball box 33 contacts the tapered groove 53 of the guide ring 50 and the alignment ball 31 contacts the outer surface of the base shaft 6. A combination 30 may be arranged.

  Furthermore, the alignment combination 30 may be formed of a solid or hollow pin having at least a curved surface on the outer diameter side. In addition, a member that deforms by pressing with the tapered groove 53 (spiral slit 153) may be used instead of the alignment combination 30 as long as the alignment can be made by contacting the outer surface of the base shaft 6.

  Further, the alignment combination 30 is constituted by a pin having a thread groove formed at least on the outer end surface thereof, and the entire inner surface of the ring main body 51 of the guide ring 50 is formed by a tapered surface reduced in diameter toward the tip side, and a thread is formed. And the screw thread on the inner surface of the ring body 51 and the thread groove on the outer diameter side of the pin are screwed together, and the guide ring 50 and the sleeve 40 that is rotationally fixed are rotated in the screwing direction, so that the pin is moved to the center of the diameter. You may comprise so that it may move.

Further, in the above-described bit holders 1 and 1a, the three alignment combinations 30 are arranged at equal intervals in the circumferential direction and aligned with the flat portion of the base shaft 6 of the hexagonal section. You may comprise so that it may align by making it contact | abut to a part, and it may align by the six alignment combinations 30.
Furthermore, the alignment combination 30 may not be provided, and three or more retaining balls 20 may be arranged at equal intervals in the circumferential direction so as to align with the locking groove 7 to be locked.

DESCRIPTION OF SYMBOLS 1 ... Bit holder 5 ... Rotating jig 6 ... Base shaft 7 ... Locking groove 10 ... Holder body 11 ... Hexagonal insertion hole 13 ... Alignment hole 14 ... Alignment recess 20 ... Retaining ball 30 ... Alignment combination 31 ... Alignment ball 32 ... O-ring 33 ... ball box 40, 140 ... sleeve 43 ... pressing portion 50,150 ... guide ring 53 ... taper groove 60 ... spring 144 ... front gear 153 ... spiral slit 154 ... rear gear 253 ... axial slit 353 ... L-shaped Slit 353a ... circumferential groove K ... power tool M ... motor

Claims (12)

A holder body having a base shaft insertion hole into which the base shaft of the rotating jig is inserted from the front end side;
An external fitting member that is externally fitted to the holder body and is movable in the axial direction;
A contact aligning means that contacts and aligns with the outer surface of the base shaft from at least three directions;
In accordance with the movement of the outer fitting member in the axial direction, there is provided guide means for guiding the contact alignment means in synchronization with the radial center direction of the base shaft insertion hole,
Proximal end alignment support means for supporting the proximal end portion of the inserted base shaft in an aligned state at least in a use state at the base end of the base shaft insertion hole,
Base shaft holder. The abutting aligning means is composed of a moving abutting aligning means movable in the radial direction,
The base shaft holder according to claim 1, wherein the holder main body is provided with a position restricting portion for restricting a circumferential position and an axial position so that the moving contact aligning means can be moved in a radial direction. The moving contact alignment means is
The base holder according to claim 2, wherein the base holder is configured by a columnar body that is higher than a radial thickness of the position restricting portion and at least a radially outer side is a curved surface. The moving contact alignment means is
It is composed of a synthetic columnar body having a columnar body arranged on the inner side and a sphere arranged on the outer side of the columnar body,
The base holder according to claim 2, wherein a height of the synthetic columnar body is larger than a thickness in a radial direction of the position restricting portion. In the synthetic columnar body,
The base shaft holder according to claim 4, further comprising an urging unit that urges the columnar body and the sphere in a direction in which the columnar body and the sphere are separated in a radial direction. The guiding means is
6. The variable width groove according to any one of claims 1 to 5, wherein the groove is a variable width groove that gradually narrows along the axial direction and along the moving direction of the outer fitting member, and that is engaged with a radially outer side of the moving contact aligning means. The base holder described in 1. The variable width groove is
The base shaft holder according to claim 6, which gradually changes in the circumferential direction along the axial direction. In the terminal portion of the moving direction in the variable width groove,
The base holder according to claim 6 or 7, wherein the circumferentially variable width grooves extending in the circumferential direction are continuously arranged. The base shaft holder according to any one of claims 1 to 8, wherein the guide means is configured separately from the outer fitting member. The base shaft holder according to claim 9, further comprising a relative rotation restricting means for restricting relative rotation between the guide means and the outer fitting member. Lock-out preventing means for locking the lock shaft provided in the base shaft in the radial direction and preventing the base shaft inserted into the base shaft insertion hole from slipping out;
Reverse direction biasing means for biasing the outer fitting member in the reverse direction with respect to the moving direction in the axial direction,
The outer fitting member is provided with a pressing unit that presses the slip-out preventing unit to the inside of the diameter along with the movement in the moving direction.
The base holder according to any one of claims 1 to 10, wherein the abutting alignment means is disposed on a distal end side with respect to the withdrawal prevention means. A drive device and a rotation transmission means for transmitting the rotational force of the drive device to the axis;
An electric tool provided with the base holder according to any one of claims 1 to 11 so as to be rotatable by the rotation transmitting means.

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