JP5412744B2 - Portable tools - Google Patents

Description

  The present invention relates to a portable tool for performing, for example, a screw tightening operation or a hole drilling operation, and more particularly to a portable tool having an improved mechanism for holding a tip tool.

  In a conventional portable tool, for example, a technique disclosed in Patent Document 1 is known as a mechanism for holding a tip tool. In Patent Document 1, a through hole is provided in a holding member (connecting sleeve) to which a tip tool is attached, and a ball (sphere) that can move in the axial direction and the radial direction of the tip tool is disposed in the through hole. A sleeve (sliding sleeve) that restricts the movement of the ball in the radial direction and is attached to the outer peripheral side of the holding member is provided. The sleeve is movable rearward in the axial direction of the tip tool, and on the inner side thereof is a spring that urges the ball to be held at a position protruding inside the holding member, and an annular ring that is positioned between the spring and the ball. A member (thin plate ring) is arranged. In Patent Document 1, the tip tool can be attached with one touch only by inserting the tip tool into the holding member.

  When the tip tool is inserted into the holding member, the tip of the tip tool comes into contact with the ball held at the position protruding inside the holding member by the sleeve, and the ball resists the spring bias by pushing the tip tool as it is. Then, it is moved in the axial direction by the tip tool. By this movement, the ball is released from the restriction of the movement in the radial direction by the sleeve, and while being guided by the annular member, the ball moves outward in the radial direction due to the inclination of the tip portion of the tip tool and does not protrude into the holding member. At this time, the ball is constantly urged to move inward in the radial direction of the tip tool by the biasing force of the spring and the shape of the annular member, and when the concave portion of the tip tool is positioned below the ball, the ball penetrates. It moves in the axial direction again by the urging force of the spring in the hole, and returns to the position where it protrudes into the holding member by the sleeve, and the recess of the tip tool and the ball engage.

Japanese Examined Patent Publication No. 3-43003

  In the mechanism of Patent Document 1 described above, when the tip tool is extracted, the ball can be moved radially outward by moving the sleeve to the rear side (motor side) of the main body, and the engagement between the tip tool and the ball is released. The tip tool can be removed from the holding member. However, since the sleeve is always urged to the front side of the main body by the spring, if the sleeve accidentally collides with the work material, etc. during work such as screw tightening, the sleeve may move to the rear side of the main body. As a result, the tip tool could be removed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a portable tool that prevents a tip tool from being detached even if a sleeve accidentally collides with a work material during operations such as screw tightening. Is to provide.

  Another object of the present invention is to provide a portable tool in which the tip tool can be mounted with one touch and the tip tool can be removed with a simple operation.

  The characteristics of representative ones of the inventions disclosed in the present application will be described as follows.

According to one feature of the present invention, a drive source such as a motor, is rotated by a driving source, an anvil tip tool is mounted on a front-side, the extending long through hole in the axial direction of the tool bit are formed in the anvil A locking member that is movably disposed in the axial direction and the radial direction of the tip tool, protrudes into the anvil and engages with a recess formed in the tip tool, and restricts or releases the radial movement of the locking member. In a portable tool having a substantially cylindrical sleeve having a stepped portion formed on the inner peripheral side for projecting the locking member into the anvil at the time of regulation, when attaching the tip tool to the anvil , the tool can be mounted only by inserting the anvil, is moved when removing the tip tool from the anvil, the position of the step portion from the outer peripheral side of the locking member by moving the sleeve to the front on the front side Configured to release the restricted state by the locking member by Rukoto.

The anvil has a stepped axially rearward of the through hole, wider diameter after how side of the step is formed such that the diameter of the front side in becomes narrower, the portion of smaller diameter, and a first washer first 1 and the annular member are inserted, the locking member is urged forward in the axial direction in the through hole by the annular member, and when the tip tool is attached, the locking member causes the force of the first spring by the tip tool. The insertion of the tip tool into the anvil is allowed by moving backward and radially outward against the above, and the locking member is fitted into the recess formed in the tip tool by the action of the first spring. did. Here, it is preferable that the annular member has a shape in which the outer periphery is along the inner peripheral shape of the sleeve, and the inner periphery is in a shape along the outer peripheral shape of the anvil .

In the small diameter part of the anvil, the second spring is arranged so that the rear end thereof is in contact with the stepped portion of the sleeve, the front end of the second spring is held by the second washer, and the second washer is held against the anvil. Thus, the sleeve is urged rearward in the axial direction by holding it so as not to move forward in the axial direction. The sleeve has an inner diameter on the rear side of the step portion that is thicker than an inner diameter on the front side, and the spring force of the second spring disposed on the front side is stronger than the spring force of the first spring disposed on the rear side. good. A steel ball can be used for the locking member, and one set or a plurality of sets of the locking member and the through hole may be provided in the anvil .

According to the first aspect of the present invention, when attaching the accessory tool, it can be attached simply by inserting the accessory tool into the anvil, and when removing it, it can be removed simply by moving the sleeve to the front side. Good for. In addition, the moving direction of the sleeve at the time of removal is opposite to the direction of the force applied to the sleeve 15 when the sleeve accidentally collides with the work material during work such as screw tightening, so that the tip tool can be removed. The tip tool will not fall off. In addition, since the first washer, the first spring, and the annular member are inserted into the thin-diameter portion of the anvil, and the locking member is urged axially forward in the through hole by the annular member, a simple structure The structure that attaches the tip tool with one touch can be realized. In addition, the second spring is disposed so that the rear end thereof is in contact with the stepped portion of the sleeve, the front end is pressed by the second washer, and the second washer is held so as not to move forward in the axial direction with respect to the anvil. Thus, since the sleeve is urged rearward in the axial direction, the sleeve can be stably held on the anvil. Further, since the sleeve is urged rearward by the second spring, the rear end of the sleeve abuts against the side surface of the first washer, so there is no need to firmly fix the first washer to the anvil. The sleeve can also be held in a stable state.

According to the invention of claim 2, rather the inner diameter of the rear side greater than the inner diameter of the front side of the stepped portion of the sleeve, the spring force of the second spring is disposed on the front side, the second is located on the rear side 1 Since the spring force of this spring is stronger than that of the spring, it is possible to prevent the sleeve from rattling in a normal state and to hold the sleeve in a stable state.

According to the invention of claim 3 , since the locking member is a steel ball, a mechanism that operates smoothly can be manufactured at low cost.

According to the invention of claim 4 , by adopting a configuration in which the tip tool is held by a plurality of locking members, the radial deflection of the tip tool is effectively suppressed, and the impact load applied to one locking member is reduced. Can be dispersed.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

Hereinafter, the portable tool which concerns on the Example of this invention is demonstrated using FIGS. 1-3. FIG. 1 is a cross-sectional view showing an entire portable tool according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the holder mechanism portion of FIG. FIG. 3 is a view showing the shapes of the sleeve 15, the anvil 13, and the annular member 20. It is sectional drawing of each part of the holder mechanism part of FIG. 2, (1) is AA sectional drawing, (2) is BB sectional drawing, (3) is CC sectional drawing, (4) is DD It is sectional drawing. In this specification, the directions shown in FIG. 1 are defined as the front side, the rear side, the upper side, and the lower side.

  In FIG. 1, an impact driver 1 is shown as an example of a portable tool. The housing of the impact driver 1 is mainly formed by being divided into a main body housing 2 and a hammer case 3, and a motor 7, a reduction gear mechanism 8 composed of planetary gears, and a reduction gear mechanism 8 are contained therein. The spindle 9 is rotated by the rotational force of the motor 7 transmitted through the motor 9, and is rotatable through the ball 10 disposed between the cam groove formed in the spindle 9 and the cam groove formed in the hammer 11, and in the direction of the rotation axis. And a hammer 11 that is struck by a plurality of hammer claws provided on the hammer 11. The hammer 11 is biased toward the anvil side (front side) by the spring 12. On the tip side (front side) of the anvil 13, a hexagonal hole 13 d having a regular hexagonal cross section in the axial direction is formed, and a tip tool (not shown) such as a driver bit, a nut or a bolt for rotating the screw is not shown. A socket for giving rotation is attached.

  An outline of the operation of the impact driver 1 is as follows. When the trigger switch 6 is pulled, the power of the rechargeable battery 5 is transmitted to the motor 7 and the motor 7 rotates. The rotational force of the motor 7 is decelerated by the reduction gear mechanism 8 and rotates the spindle 9. As the spindle 9 rotates, the hammer 11 rotates via a ball 10 disposed between a cam groove formed on the spindle 9 and a cam groove formed on the hammer 11 side. The hammer 11 is pressed forward (in the direction of the anvil 13) by a spring 12 disposed between the hammer 11 and the reduction gear mechanism 8, and a hammer claw portion (not shown) provided at the front end of the hammer 11 and an anvil 13 Rotational force is transmitted to the anvil 13 by an anvil blade (not shown) provided at the rear end.

  When a force that impedes rotation is generated in the anvil 13 via the tip tool during operations such as screw tightening, a rotation difference is generated between the spindle 9 and the anvil 13, and the hammer 11 that is engaged by the anvil blade and the hammer claw is engaged. Also, a rotational difference is generated between the spindle 9 and the spindle 9. Due to this difference in rotation, the ball 10 moves backward (in the direction of the motor 7) along the cam groove, and the hammer 11 moves backward while compressing the spring 12 while being guided by the ball 10.

  When the hammer 11 is further retracted, the anvil wing and the hammer pawl are disengaged, and the hammer 11 is pushed back along the cam groove by the compression load of the compressed spring 12, and the ball disposed in the cam groove. 10, the hammer 11 is moved forward while rotating by the rotation of the spindle 9, and the hammer claw hits the anvil wing. In this way, by repeatedly striking the anvil 13 by the movement and rotation of the hammer 11 in the axial direction, the anvil 13 is rotated while continuously applying impact torque.

Next, a mechanism for holding the tip tool will be described with reference to FIGS. An anvil 13 is rotatably held on the hammer case 3 via a bearing 14 such as a metal bearing. A through hole 25 for movably receiving the ball 18 is formed on the side surface on the tip side of the anvil 13. The shape of the through hole 25 is formed so that the ball 18 does not fall out from the through hole 25 to the inner peripheral side. On the rear side of the ball 18, an annular member 20 urged by a first spring 19 is provided, whereby the ball 18 is urged forward. The rear end of the first spring 19 is held by the first washer 16. A sleeve 15 is disposed around the front end side of the anvil 13. The sleeve 15 can be moved axially forward from the steady position shown in FIG. The sleeve 15 has a step portion 15b (see FIG. 3A) on the inner periphery near the center, and restricts the movement of the ball 18 radially outward on the inner periphery side of the step portion 15b.

  If the portion of the ball 18 that contacts the annular member 20 is not near the center position in the radial direction of the tip tool, the annular member 20 is deformed without being able to accurately transmit the biasing force of the spring to the locking member. There is a possibility that the annular member 20 is located above the ball 18 and the ball 18 does not return to the predetermined position. For this reason, as shown in FIG. 3 (3), the annular member 20 has an arcuate portion on the inner peripheral side and a linear portion 20 a, and the vicinity in contact with the ball 18 has a width in the radial direction. It is getting wider. The contact area between the annular member 20 and the ball 18 is increased by the linear portion 20a. Further, as can be understood from the cross-sectional view of FIG. 2, when the inner peripheral side of the annular member 20 is slightly bent backward, the contact area with the ball 18 is increased and stabilized, and the ball 18 is moved radially inward. Can guide. It should be noted that this warping state can be understood up to which region is flat in the shape of the annular member 20 shown in the CC section of FIG. When warped in this way, the contact state between the first spring 19 and the annular member 20 is also improved.

  A compression-type second spring 21 is provided on the front side of the step portion 15b of the sleeve 15, and the sleeve 15 is urged rearward in the axial direction by this spring, and the rear end of the sleeve 15 abuts against the first washer. Held in position. The front end of the second spring 21 is held by a second washer 17 whose axial movement is restricted by a retaining ring 22. The sleeve 15 is preferably made of metal, for example iron or any alloy. The rear end portion 15 a (FIG. 3 (1)) of the sleeve 15 is brought into contact with the side surface of the first washer 16. Therefore, the diameter of the first washer 16 is preferably substantially the same as or slightly larger than the diameter of the rear end portion 15a of the sleeve 15.

  FIG. 3A is a diagram showing a cross-sectional shape of the sleeve 15 and shows a cross-section of the upper half. The sleeve 15 has a continuous cylindrical shape in the radial direction. In the vicinity of the center of the sleeve 15, a step portion 15 b having a small inner diameter is formed. As can be understood from the BB cross-sectional view of FIG. 4B, the ball 18 is not protruded from the inside of the anvil 13 to the outside. The inner diameter is a large one. In the step portion 15b, the corner shown in the cross section is cut off obliquely so that the ball 18 can move smoothly. As can be understood from FIGS. 4 (3) and 4 (4), the inner diameter at the rear of the step portion 15b is larger than the inner diameter at the front, and the annular member 20 is accommodated so as to be movable. It is sized to accommodate the protrusion of the ball 18 that has moved outward from the outside.

  FIG. 3B is a cross-sectional view of the anvil 13. At the rear end of the anvil 13 (the end on the hammer 11 side), two fan-shaped wings (see FIG. 5) projecting in a radial direction at positions separated by about 180 degrees corresponding to the claws (not shown) of the hammer 11. Not shown). A first step 23 is formed near the center of the anvil 13 in the axial direction, and a small diameter portion 28 having a small diameter is formed. The sleeve 15 is disposed on the outer peripheral side of the small diameter portion 28. Further, one through hole 25 for inserting the ball 18 is formed in a part of the small diameter portion 28. In the present embodiment, the through hole 25 is formed in a portion where the thickness is further reduced by the second step 24. As can be understood from the AA sectional view and the BB sectional view of the anvil 13 shown in FIGS. 4 (1) and (2), the second step 24 is cut horizontally on the upper part of the circumference. It is the shape that was done. As can be understood from FIG. 4B, the shape of the through hole 25 is such a size that the ball 18 can be inserted from the outer peripheral side of the anvil 13 toward the inner side in the radial direction and cannot pass through to the inner peripheral side. The size (width) of the through hole 25 in the radial direction is slightly larger than the diameter of the ball 18 outside the anvil 13 and slightly smaller than the diameter of the ball 18 inside the anvil 13. The size (length) of the through-hole 25 in the front-rear direction (axial direction of the anvil) is larger than the size of the ball 18 and is large enough to allow the ball 18 to move in the front-rear direction in the through-hole 25.

  In FIG. 3 (2), a concave portion 26 that is substantially continuous in the radial direction for inserting the retaining ring 22 is formed near the tip of the anvil 13. However, the concave portion 26 is not formed at a location where the inner diameter is further reduced by the second step (the front end portion and the upper side in FIG. 3 (1)). FIG. 3 (3) is a plan view of the annular member 20, where the inner peripheral side has an arcuate portion and a straight portion 20 a, and the radial direction is held at a location (portion 20 a) that holds the ball 18. Wide. The annular member 20 is a metal thin plate, for example, and can be easily manufactured by a press or the like. It is preferable that the guide portion 20 a be inclined slightly rearward on the inner peripheral side so as to follow the outer diameter of the ball 18.

  Next, the manufacturing and assembling procedure of the mechanism for holding the above-described tip tool will be described. First, the bearing 14 is inserted from the inside of the hammer case 3 (left side in FIG. 2). Next, the hammer case 3 is penetrated by inserting the anvil 13 into the bearing. Next, the first washer 16 is inserted from the front end side of the anvil 13 and pushed to the position of the first step 23. The first washer 16 can be fixed by press-fitting, but in this embodiment, it is a gap. Next, the first spring 19 and the annular member 20 are inserted from the tip of the anvil 13. Next, while pressing the annular member 20 backward, that is, while holding the first spring 19 so as to be slightly contracted, the ball 18 is inserted into the through hole 25, and then the sleeve 15 is inserted from the tip of the anvil 13, The rear end portion 15 a of the sleeve 15 is held so as to contact the first washer 16. When the sleeve 15 is held at this position, the ball 18 is urged to the front side of the through hole 25 by the first spring 19, and the movement in the radial direction is also restricted just at the step portion 15 b of the sleeve 15. Next, the second spring 21 and the second washer 17 are inserted from the front side of the anvil 13, and the second washer 17 is fixed by the retaining ring 22. Thereby, the assembly work of the mechanism for holding the tip tool is completed. The retaining ring 22 can be fixed by being fitted into the recess 26 of the anvil 13. By the above-described procedure, a mechanism (holder mechanism) for holding the tip tool can be easily assembled.

  As described above, the portable tool according to the present embodiment is assembled by simply inserting it into the anvil 13 for the assembly of the mechanism for holding the tip tool, all members except for the ball 18 being cylindrical or annular. As a result, assembly workability can be improved. Although it is necessary to work against the biasing force of the first spring 19 and the second spring 21 during the assembly work, the state against the biasing force of the first spring 19 and the second spring 21 is maintained. Since the holding member is an annular member (annular member 20, second washer 17), this point can be easily performed without deteriorating workability.

  If the first washer 16 is fixed with a clearance, it may move in the axial direction. However, if a spring stronger than the first spring 19 is used as the second spring 21, the sleeve 15 always moves rearward in the axial direction. As a result, the rear end portion 15 a of the sleeve 15 is stabilized at a position where the sleeve 15 contacts the first washer 16. As a result, since the first washer 16 is held at the position of the first step 23 of the anvil 13, no trouble occurs even if the first washer 16 is not firmly fixed to the anvil 13.

  Next, operation | movement at the time of attaching a front-end tool to the anvil 13 is demonstrated using FIGS. 5 and 6 are diagrams showing each state when the tip tool is mounted on the anvil 13 and held. Each of these figures is arranged in chronological order.

First, the tip tool 30 is inserted into the hexagonal hole 13d formed at the tip of the anvil 13. The insertion direction is the direction of the arrow shown in FIG. The tip of the inclined surface 30a of the tip tool 30 is inserted until it contacts the ball 18 (FIG. 5 (a state of 1)), when further inserted ball 18 is pressed on the inclined surfaces 30a, pushed annular member 20 with the ball 18 As a result, the first spring 19 is contracted, and the ball 18 starts moving backward (left side) (the state shown in FIG. 5B). Further, when the tip tool 30 is inserted, the ball 18 abuts against the rear end of the through hole 25 (the state shown in FIG. 5 (3)). This position is a position where the ball 18 can move most backward. Further, when the tip tool 30 is inserted, the ball 18 cannot move further rearward, but since the contact portion of the tip tool 30 is the inclined surface 30a, the ball 18 moves radially outward (FIG. 5 (4)). State). The annular member 20 has a shape that the inner peripheral side is slightly along the rear, and when the ball 18 moves radially outward, the first spring 19 is further contracted. As can be understood from the drawing, in the state shown in FIG. 5 (4), the ball 18 is positioned outside the inner peripheral surface of the tip tool 30 , so that the insertion of the tip tool 30 is no longer hindered.

FIG. 6 (1) shows a state in which the tip tool 30 is further inserted. When inserted up to FIG. 6 (2), the ball 18 is continuously formed in the radial direction formed in the tip tool 30 , and the cross section reaches the position of the semicircular recess 30b. It moves radially inward by entering the recess 30b. Further, when the tip tool 30 is inserted, the ball 18 is positioned at the deepest portion of the recess 30b and is stabilized at this location (state shown in FIG. 6 (3)). At this time, since the ball 18 is urged forward by the first spring 19 via the annular member 20, the ball 18 is stabilized at a position where the ball 18 contacts the front side of the through hole 25.

As described above, in the mechanism according to the present embodiment, when the tip tool 30 is attached, there is no need to move the sleeve 15, and the tip tool 30 is simply inserted into the hexagonal hole 13d of the anvil 13 with one touch. Since it can be attached, it is very convenient to use.

  Next, with reference to FIG. 7, a state where the tip tool 30 is held by the anvil 13 and each state at the time of removal will be described.

In a state where the tip tool 30 is mounted (the state shown in FIG. 7 (1)), when the tip tool 30 is pressed backward, the inclined surface 30a at the tip of the tip tool 30 abuts against the inner wall of the anvil 13, It cannot move any further. On the contrary, when the tip tool 30 is pulled, the ball 18 slightly moves in the radial direction by the inclined surface of the recess 30b. However, since there is a step portion 15b of the sleeve 15 on the outer peripheral side of the position of the ball 18, since the ball 18 cannot move further to the outer peripheral side, the tip tool 30 is locked and the tip tool 30 comes off. No (state of FIG. 7 (2)).

  In order to remove the tip tool 30, the operator moves the sleeve 15 by pulling the sleeve 15 forward in the axial direction (arrow 29 in FIG. 7 (3)) (state shown in FIG. 7 (3)). Then, the second spring 21 is compressed. At this time, the first spring 19 is fully extended, and the positional relationship between the annular member 20 and the anvil 13 is hardly changed. However, the position of the step portion 15b is shifted forward by moving the sleeve 15, so that the ball The holding state on the radially outer side of 18 is released. In this state, when the operator moves the tip tool 30 forward (withdrawal), the ball 18 is guided by the inclined surface of the recess 30b and moves radially outward (the state shown in FIG. 7 (3)), and finally the ball 18 Is positioned outside the inner wall of the tip tool 30 (state shown in FIG. 7 (4)). In this state, the movement of the tip tool 30 is not limited, and the operator can pull out the tip tool 30.

  When the pulling of the sleeve 15 is stopped after the tip tool 30 is pulled out, the sleeve 15 returns to the original position, that is, the state shown in FIG. 2 by the urging force of the second spring 21.

  As is clear from the above description, according to the present invention, the tip tool 30 can be inserted into the anvil 13 with one touch, which is very convenient. On the other hand, when removing, the tip tool 30 cannot be removed unless the sleeve 15 is moved forward. The moving direction of the sleeve 15 during the removal is opposite to the direction of the force applied to the sleeve 15 when the sleeve collides with the work material. Therefore, even if the sleeve collides with the work material during work such as screw tightening, the tip tool is not in a state of being removed, and the tip tool does not fall off.

  As mentioned above, although demonstrated based on embodiment which shows this invention, this invention is not limited to the above-mentioned form, A various change is possible within the range which does not deviate from the meaning.

  For example, in the above embodiment, the impact driver is used as the portable tool. However, the present invention is not limited to this, and a tip tool such as a normal electric driver or an air driver using an air motor can be used. The same applies to other removable tools.

  Further, in the above embodiment, the holder mechanism for holding the tip tool is provided on the anvil 13 of the portable tool having the rotary hitting mechanism. However, in the portable tool having no rotary hitting mechanism, You may make it provide a holder mechanism in the spindle connected indirectly.

  Furthermore, in the said embodiment, although it was set as the structure which used the ball | bowl 18 as a locking member, you may use the locking member made into the column shape as a locking member.

It is sectional drawing which shows the whole portable tool which concerns on the Example of this invention. It is an expanded sectional view of the holder mechanism part holding the tip tool of FIG. It is a figure which shows the shape of the sleeve 15, the anvil 13, and the annular member 20 of FIG. It is sectional drawing of each part of the holder mechanism part of FIG. 2, (1) is AA sectional drawing, (2) is BB sectional drawing, (3) is CC sectional drawing, (4) is DD It is sectional drawing. It is a figure which shows each state when a front-end tool is mounted | worn with the anvil. It is a figure which shows each state when a front-end tool is mounted | worn with the anvil. It is a figure which shows each state at the time of the state in which a front-end tool is hold | maintained at the anvil 13, and removal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impact driver 2 Main body housing 3 Hammer case 4 Hammer case cover 5 Rechargeable battery 6 Trigger switch 7 Motor 8 Reduction gear mechanism 9 Spindle 10 Ball 11 Hammer 12 Spring 13 Anvil
13d Hexagon socket (of anvil) 14 Bearing 15 Sleeve 15a Rear end of (sleeve)
15b Step part 15c (sleeve) Front end part 16c (sleeve) 16 First washer 17 Second washer 18 Ball 19 First spring 20 Annular member 20a Straight part 21 (annular member) 21st spring 22 Retaining ring 23 First step 24 Second step 25 Through hole 26 Recess
28 Small diameter part (of the anvil) 30 Tip tool 30a Inclined surface 30b (of the tip tool) Recessed part (of the tip tool)

Claims (4)

A driving source;
An anvil that is rotated by the drive source and to which a tip tool is attached to its front side;
A through-hole formed in the anvil and extending in the axial direction of the tip tool is movably disposed in the axial direction and the radial direction of the tip tool, and protrudes into the anvil and is formed in the tip tool. A locking member engageable with,
In a portable tool comprising: a sleeve having a stepped portion for restricting or releasing the radial movement of the locking member and projecting the locking member into the anvil at the time of the regulation. ,
The anvil has a step axially rearward of the through hole, thicker diameter way side after stepped, formed such that the diameter of the front side in becomes narrower,
A first washer, a first spring, and an annular member are inserted into the thin-diameter portion of the anvil, and the annular member urges the locking member forward in the axial direction within the through-hole, and the step portion The second spring is disposed so that the rear end of the second spring is in contact with the second spring, the front end of the second spring is pressed by the second washer, and the second washer is held so as not to move forward in the axial direction with respect to the anvil. By doing so, the sleeve is urged rearward in the axial direction, the rear end of the sleeve abuts on the front surface of the first washer,
When the tip tool is attached, the tip tool allows the locking member to move rearward and radially outward against the force of the first spring, thereby allowing the tip tool to be inserted into the anvil . And it can be mounted simply by inserting the tip tool into the anvil such that the locking member fits into the recess formed in the tip tool by the action of the first spring,
When removing the tip tool from the anvil , by moving the sleeve to the front side, the position of the stepped portion is moved from the outer peripheral side of the locking member to the front side, thereby releasing the restriction state by the locking member. A portable tool characterized by that. Wherein the sleeve, the spring force of the second spring, the first spring is arranged on the rear side spring inner diameter of the rear side of the stepped portion is rather larger than the inner diameter of the front side, it is disposed on the front side The portable tool according to claim 1 , wherein the portable tool is stronger than force. The portable tool according to claim 2 , wherein the locking member is a steel ball. The portable tool according to any one of claims 1 to 3 , wherein the anvil is provided with a plurality of sets of the locking member and the through hole.

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