Driver wrench and electric rotary driving machine

Abstract

To provide a wrench which is improved in operability and safety, and configured so that a permanent magnet that magnetically holds a fastening member does not degrade with age.SOLUTION: A wrench 1, which is attached to an electric rotary driving machine, comprises: a cylinder 12 in a nearly circular shape which is made of resin or non-magnetic metal; and a collar 13 in a substantially cylindrical shape having a permanent magnet built therein, and which can slide on an outer peripheral surface of the cylinder in an axial direction and in a circumferential direction. The cylinder has a fastening member holding part 12a at a tip end side thereof, and also has a space part 12b extending in the axial direction on a deeper side of the fastening member holding part. When the collar is arranged at a position where the permanent magnet opposes to the fastening member holding part, a fastening member in the fastening member holding part is magnetically held by the permanent magnet.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a wrench that can be attached to an electric rotary drive machine and that can tighten or loosen fastening members while being held by magnetic force, and to a collar operating tool that can be used in combination with the wrench. [Background technology]

[0002] Known wrenches that tighten or loosen fastening members while being held by magnetic force include the jig disclosed in Patent Document 1 (hereinafter simply referred to as the "jig") and the socket disclosed in Patent Document 2 (hereinafter simply referred to as the "socket").

[0003] For example, Figures 3 to 6 of Patent Document 1 illustrate a jig that can be attached to an electric rotary drive machine (impact wrench) and can switch between a state in which a fastening member (nut, bolt, etc.) in a holding portion is magnetically held and a state in which it is not magnetically held by manipulating the position of a cylindrical magnet member.

[0004] Furthermore, Figures 7A to 7C of Patent Document 2 show a socket that can be attached to a ratchet handle and can switch between a state in which the nut or bolt head in the fitting hole is magnetically held and a state in which it is not held by manipulating the position of a circular permanent magnet.

[0005] In this way, by using the jig of Patent Document 1, the fastening member can be magnetically held by contacting the cylindrical magnet member with the fastening member, and by using the socket of Patent Document 2, the nut or bolt head can be magnetically held by contacting the annular permanent magnet with the nut or bolt head. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-167791 [Patent Document 2] Japanese Patent Application Publication No. 2023-17284 Summary of the Invention [Problem to be solved by the invention]

[0007] However, when the techniques of Patent Document 1 and Patent Document 2 are used to tighten or loosen a fastening member, the following problems arise.

[0008] First, as shown in Fig. 1, consider a case where two plates 5 are fastened together using a magnetic metal bolt 3 and nut 4, and the tip of the bolt 3 protrudes from the end face of the nut 4, and then loosen the nut 4. Note that, hereinafter, the tip portion of the bolt 3 protruding from the nut 4 will be referred to as a protruding portion 31.

[0009] The magnet member in Patent Document 1 rotates synchronously with the jig, and the permanent magnet in Patent Document 2 also rotates synchronously with the socket. Therefore, when loosening the nut 4 in FIG. 1 using a jig or socket, the magnet member in the jig and the permanent magnet in the socket rotate synchronously with the rotation of the nut 4. Here, loosening the nut 4 in FIG. 1 is equivalent to the asynchronous rotation of the bolt 3 and the nut 4. Therefore, if the nut 4 loosens, a difference in rotational speed occurs between the magnet member or permanent magnet, which rotates synchronously with the nut 4, and the protrusion 31, which does not rotate synchronously with the nut 4. Therefore, at the contact point between the two, the relatively hard protrusion 31 scrapes off the relatively soft magnet member or permanent magnet. As a result, over the long term use of the jig or socket, the magnet member or permanent magnet gradually wears down and deforms, potentially gradually impairing the original function of the jig or socket.

[0010] Furthermore, in the jig of Patent Document 1, an operating piece for moving the magnet member protrudes from the side (see Figures 3 to 6 of the same document, etc.), and in the socket of Patent Document 2, a release member for moving the permanent magnet also protrudes from the side (see Figures 2A, 2B of the same document, etc.), so when you want to switch the magnetic holding function on or off, you need to visually check the position of the operating piece or release member and then operate those parts, making the operation of switching the magnetic holding function complicated.

[0011] Furthermore, the operating piece in Patent Document 1 rotates in synchronization with the jig, and the release member in Patent Document 2 also rotates in synchronization with the socket, so there is a risk of injury to the worker if the worker's hand comes into contact with the operating piece or release member while the electric rotary drive machine is running.

[0012] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a wrench that does not suffer from deterioration over time of the permanent magnet that magnetically holds the fastening member, and that has improved operability and safety. [Means for solving the problem]

[0013] In order to solve the above problems, the wrench of the present invention is attached to an electric rotary drive machine and is made of resin or a non-magnetic metal, and comprises an approximately cylindrical cylinder and an approximately cylindrical collar that is capable of sliding axially and circumferentially on the outer surface of the cylinder and has a permanent magnet built in. The cylinder has a fastening member holding portion at its tip and has a long space in the axial direction further back than the fastening member holding portion, and when the collar is positioned so that the permanent magnet and the fastening member holding portion face each other, the fastening member in the fastening member holding portion is magnetically held by the permanent magnet. [Effects of the Invention]

[0014] According to the wrench of the present invention, the permanent magnet that magnetically holds the fastening member does not deteriorate over time, and operability and safety can be improved. [Brief explanation of the drawings]

[0015] [Figure 1] A diagram showing two plates fastened together using bolts and nuts. [Figure 2] 1 is a diagram showing an electric rotary drive machine equipped with a socket wrench according to a first embodiment. [Figure 3] FIG. 1 is a perspective view of a socket wrench according to a first embodiment. [Figure 4] 1A and 1B are a side view and a cross-sectional view of a socket wrench according to a first embodiment of the present invention; [Figure 5]10A and 10B are a side view and a cross-sectional view of a socket wrench according to a second embodiment of the present invention; [Figure 6] A diagram showing two plates fastened together using a wing bolt and wing nut. [Figure 7] FIG. 10 is a perspective view of a socket wrench according to a third embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a socket wrench according to a third embodiment. [Figure 9] A diagram showing two plates fastened together using screws. [Figure 10] FIG. 10 is a cross-sectional view of a driver wrench according to a fourth embodiment. [Figure 11] FIG. 10 is a diagram showing an electric rotary drive machine equipped with a collar operating tool according to a fifth embodiment. [Figure 12] FIG. 13 is a diagram showing an electric rotary drive machine equipped with a collar operating tool according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a socket wrench or a driver wrench as an embodiment of the wrench of the present invention will be described with reference to the drawings. [Example]

[0017] First, a socket wrench 1 according to a first embodiment of the present invention will be described with reference to FIGS.

[0018] 2 is a diagram showing an electric rotary drive machine 2 equipped with a socket wrench 1 according to this embodiment. The electric rotary drive machine 2 illustrated here is an electric tool such as an impact wrench used to tighten or loosen magnetic metal fasteners (bolts 3, nuts 4, etc.), and includes a socket mounting portion 21 for mounting the socket wrench 1, an operating portion 22 for turning the rotary drive on and off and switching the direction of rotation, and a handle 23 for the operator to hold while tightening or loosening the fastener.

[0019] Figure 3 shows a perspective view of the socket wrench 1 of this embodiment as seen from the base side and from the tip side. Also, Figure 4 shows a side view and a cross-sectional view of the socket wrench 1 of this embodiment. As shown in these figures, the socket wrench 1 of this embodiment includes an adapter 11, a cylinder 12, and a collar 13. Each component will be explained below in order.

[0020] <Adapter 11> The adapter 11 is a columnar metal fitting having an approximately hexagonal column-shaped insertion portion 11a and a connecting portion 11b with a larger diameter than the insertion portion 11a. When attaching the socket wrench 1 to the electric rotary drive machine 2, the insertion portion 11a is inserted and fixed into an approximately hexagonal column-shaped hole provided at the tip side of the socket attachment portion 21.

[0021] <Cylinder 12> Cylinder 12 is a substantially cylindrical member made of resin or non-magnetic metal and fixed to connecting portion 11b of adapter 11, and has fastening member holding portion 12a, cylindrical space portion 12b, and flanges 12c and 12d. If the torque specification required for fastening or loosening the fastening member is small, cylinder 12 can be made of resin, but if the torque specification is large, it is desirable to make cylinder 12 out of non-magnetic metal.

[0022] The fastening member holding portion 12a is a hollow portion formed at the tip end of the cylinder 12, and as shown in Fig. 3(b), is a space with a cross-sectional shape that fits with the head of the bolt 3 or nut 4 to be tightened or loosened. Therefore, the socket wrench 1 of this embodiment is prepared for each type of fastening member to be tightened or loosened.

[0023] The cylindrical space 12b is a hollow portion formed at the back side of the cylinder 12, and is a space that is long in the axial direction so that the protruding portion 31 of the bolt 3 can be accommodated when the nut 4 is tightened or loosened.

[0024] The flanges 12c and 12d are a pair of annular members formed on the tip and rear sides of the outer circumferential surface of the cylinder 12 in order to limit the sliding range of the collar 13.

[0025] <Color 13> Collar 13 is a generally cylindrical member made of resin or non-magnetic metal, and is installed so as to be able to slide axially and circumferentially within the area sandwiched between flanges 12c and 12d on the outer circumferential surface of cylinder 12. In addition, multiple permanent magnets 13a are distributed around the entire circumference of the tip side of collar 13. Collar 13 provides the following effects.

[0026] The collar 13 in this embodiment is slidable on the outer peripheral surface of the cylinder 12 in the axial direction. 4(b), when collar 13 is slid toward the tip side (toward flange 12c) so that permanent magnet 13a faces fastener holding portion 12a, the magnetic metal fastener in fastener holding portion 12a is magnetically held by permanent magnet 13a, preventing the fastener from falling off during tightening or loosening. On the other hand, when collar 13 is slid toward the back side (toward flange 12d), the magnetic holding by permanent magnet 13a is released, allowing the fastener in fastener holding portion 12a to be easily removed.

[0027] As is apparent from Figure 4(b), when the fastening member in the fastening member holding portion 12a is magnetically held, the cylinder 12 is placed between the fastening member and the permanent magnet 13a. However, by using a strong magnetic magnet such as a neodymium magnet as the permanent magnet 13a, the fastening member can be magnetically held by the magnetic force of the permanent magnet 13a even in a situation where the fastening member and the permanent magnet 13a are not in direct contact with each other.

[0028] Consider a situation in which the nut 4 shown in FIG. 1 is loosened using the socket wrench 1 of this embodiment. In this case, the nut 4 is housed within the fastener holding portion 12a of the cylinder 12, the protrusion 31 is housed within the cylindrical space 12b, and the permanent magnet 13a of the collar 13 is positioned facing the nut 4 within the fastener holding portion 12a. This allows the nut 4 to be loosened while maintaining magnetic force. Since the bolt 3 and the permanent magnet 13a do not come into contact with each other, damage or deformation of the permanent magnet 13a due to contact with the bolt 3 rotating at a different speed can be avoided. Therefore, even with long-term use of the socket wrench 1 of this embodiment, there is no degradation in the functionality of the socket wrench 1 due to damage or deformation of the permanent magnet 13a.

[0029] The collar 13 in this embodiment is a substantially cylindrical shape positioned so that its central axis coincides with the rotation axis of the socket wrench 1. Therefore, by simply gripping any position on the outer circumferential surface of the collar 13 and sliding it in the axial direction, the magnetic holding function of the socket wrench 1 can be switched between enabled and disabled, allowing fastening members to be easily attached and detached before and after tightening and loosening work.

[0030] The collar 13 of this embodiment has a smooth, substantially cylindrical shape with no protrusions on the outer circumferential surface. Therefore, even if a worker's hand or glove comes into contact with the outer circumferential surface of the collar 13 that rotates as the electric rotary drive machine 2 is driven, the possibility of injury or the glove getting caught is extremely low.

[0031] The collar 13 in this embodiment is slidable in the circumferential direction on the outer circumferential surface of the cylinder 12, and the rotation of the cylinder 12 and the rotation of the collar 13 can be independent. Therefore, depending on the situation, the operator can tighten or loosen fastening members while holding the handle 23 of the electric rotary drive machine 2 with his right hand and the collar 13 of the socket wrench 1 with his left hand, allowing the operator to tighten or loosen fastening members in a more stable position than when only the handle 23 is held.

[0032] <Effects of this Example> As described above, the socket wrench of this embodiment prevents deterioration over time of the permanent magnet that magnetically holds the fastening member, and can improve operability and safety. [Example]

[0033] Next, a socket wrench 1 according to a second embodiment of the present invention will be described with reference to Fig. 5. Note that a duplicated description of points common to the first embodiment will be omitted.

[0034] In Example 1, the worker manually slid the collar 13 to switch between a state in which the fastening member in the fastening member holding portion 12a was magnetically held and a state in which it was not magnetically held, but there was a possibility that the collar 13 would slide unintentionally, and there was also a possibility that the worker would not be able to maintain the state he or she wanted.

[0035] Therefore, in this embodiment, as shown in Figure 5, a spring 14 is placed between the collar 13 and the flange 12d to constantly bias the collar 13 toward the tip, thereby maintaining a state in which the fastening member can be magnetically held under normal conditions, and the magnetic holding of the fastening member is released only when the operator manually slides the collar 13 toward the back.

[0036] Although not shown in the drawings, a cylindrical spring cover 15 may be configured to cover the outer periphery of the spring 14. With this configuration, the operator does not come into contact with the spring 14 while the socket wrench 1 is rotating, and therefore injury to the operator due to contact with the rotating spring 14 can be avoided.

[0037] Furthermore, if a spring 14 is provided beside the collar 13 as in the socket wrench 1 of this embodiment, there is a concern that the collar 13 may rotate together with the cylinder 12 when the cylinder 12 rotates, or that friction may occur between the collar 13 and the spring 14. However, by providing a thrust bearing 16 or a thrust pad 17 between the collar 13 and the spring 14, or between the spring 14 and the flange 12d, the occurrence of the above-mentioned rotation together and friction can be prevented. [Example]

[0038] Next, a socket wrench 1 according to a third embodiment of the present invention will be described with reference to FIGS. Note that overlapping explanations of points common to the above embodiment will be omitted.

[0039] While the fastening members to be tightened or loosened in the above-described embodiment were a typical bolt 3 and nut 4 as shown in Fig. 1, the fastening members to be tightened or loosened in this embodiment are a wing bolt 3A and a wing nut 4A. The wing bolt 3A and the wing nut 4A are fastening members that can be tightened or loosened manually without using tools, and as shown in Fig. 6, the wing bolt 3A is provided with a pair of gripping portions 32A, and the wing nut 4A is also provided with a pair of gripping portions 41A. Note that reference numeral 31A in Fig. 6 denotes a protruding portion of the wing bolt 3A.

[0040] To accommodate tightening and loosening of fasteners equipped with such gripping portions 32A, 41A, the socket wrench 1 of this embodiment is provided with a groove 12e at the tip end of the cylinder 12 that is shaped to fit into the gripping portions 32A, 41A, as shown in the perspective view of Fig. 7 and the cross-sectional view of Fig. 8. Therefore, by using the socket wrench 1 of this embodiment, it is possible to tighten and loosen the wing bolt 3A and the wing nut 4A while holding them by magnetic force.

[0041] Even if collar 13 is positioned toward the tip of socket wrench 1, if the number of permanent magnets 13a built into collar 13 is small, depending on the orientation of collar 13, gripping portions 32A, 41A fitted into grooves 12e may become separated from permanent magnets 13a, weakening the force that magnetically holds gripping portions 32A, 41A. Therefore, to ensure that gripping portions 32A, 41A are magnetically held regardless of the orientation of collar 13, in socket wrench 1 of this embodiment, the number of permanent magnets 13a placed on collar 13 may be increased compared to the above-described embodiment, a ring-shaped permanent magnet may be placed at the tip of collar 13, or the entire collar 13 may be made of a ring-shaped permanent magnet. [Example]

[0042] Next, a driver wrench 1A according to a fourth embodiment of the present invention will be described with reference to Figures 9 and 10. Note that a duplicated description of points common to the above-mentioned embodiments will be omitted.

[0043] The socket wrench 1 of the above embodiment is intended to tighten or loosen a pair of male and female fastening members, but the driver wrench 1A of this embodiment is intended to tighten or loosen a screw 6 as shown in FIG.

[0044] 10 is a cross-sectional view of the driver wrench 1A of this embodiment. As is clear from the figure, the driver wrench 1A of this embodiment has a driver portion 11c provided at the tip side of the adapter 11. The tip of this driver portion 11c extends into the fastening member holding portion 12a, so by using the driver wrench 1A of this embodiment, the screw 6 can be tightened or loosened while being magnetically held by the permanent magnet 13a of the collar 13.

[0045] It goes without saying that the driver wrench 1A of this embodiment must be equipped with a dedicated driver portion 11c that corresponds to the specifications of the screw 6 to be tightened or loosened. In other words, if the screw 6 to be tightened or loosened is a Phillips screw, the tip of the driver portion 11c should be shaped like a Phillips screwdriver, and if the screw 6 to be tightened or loosened is a flat-head screw, the tip of the driver portion 11c should be shaped like a flat-head screwdriver.

[0046] In Figure 10, as a result of reusing the structure of the socket wrench 1 of Example 3, a certain distance is created between the screw 6 in the fastening member holding portion 12a and the permanent magnet 13a. However, if it is desired to make the magnetic holding force stronger, it is desirable to reduce the outer diameter of the cylinder 12 so that the permanent magnet 13a of the collar 13 can be positioned further inward. [Example]

[0047] Next, a color manipulation tool 7 according to a fifth embodiment of the present invention will be described with reference to Fig. 11. Note that duplicated descriptions of points common to the above-mentioned embodiments will be omitted.

[0048] When tightening or loosening a fastener using the socket wrench 1 or driver wrench 1A of the above-described embodiment, the worker could switch between a magnetically held state and a non-magnetically held state of the fastener by sliding the collar 13 in the desired direction with one hand, but at the same time, he or she had to hold the handle 23 with the other hand to fix the position of the electric rotary driver 2 (i.e., the position of the cylinder 12). Therefore, for example, in a situation where the nut 4 in Fig. 1 was to be loosened, it was not possible to use a wrench or the like held in one hand to prevent the bolt 3 from rotating, and then operate the electric rotary driver 2 with the other hand to loosen the nut 4, while also switching the magnetically held state of the nut 4.

[0049] Therefore, in this embodiment, a collar operating device 7 having the following configuration is used so that both the position of the collar 13 (i.e., the magnetic holding state of the fastening member) and the drive of the electric rotary drive machine 2 can be operated with one hand.

[0050] 11A and 11B show an electric rotary drive machine 2 equipped with a socket wrench 1 according to a second embodiment and a collar operating tool 7 according to the present embodiment, with Fig. 11A showing a magnetically retainable state and Fig. 11B showing a magnetically released state. As shown in these figures, the collar operating tool 7 according to the present embodiment has a collar connector 71 attached to the outer periphery of the collar 13, a trigger 72 attached to the handle 23 of the electric rotary drive machine 2, a control wire 73 connecting the collar connector 71 and the trigger 72, and a body connector 74 attached to the body of the electric rotary drive machine 2 to hold the control wire 73.

[0051] As shown in Figure 11(b), when an operator holding the handle 23 pulls the trigger 72 with the index finger or the like, a force transmitted through the inner wire 73b in the casing 73a of the control wire 73 and the collar connection portion 71 moves the collar 13 to the right in the figure, releasing the magnetic retention of the fastening member by the permanent magnet 13a. Therefore, if the nut 4 was magnetically retained in the fastening member retaining portion 12a, the nut 4 is ejected from the fastening member retaining portion 12a as illustrated in the figure. On the other hand, when the operator releases the finger that was pulling the trigger 73, the restoring force of the spring 14 acts to move the collar 13 to the left in the figure, restoring the fastening member to a state in which it can be magnetically retained, as shown in Figure 11(a).

[0052] The operating unit 22 of the electric rotary drive unit 2 is originally located in a position where it can be operated while holding the handle 23, so if the collar operating device 7 of this embodiment is attached to the socket wrench 1 and the electric rotary drive unit 2, both the operating unit 22 and the trigger 72 can be operated with just the hand holding the handle 23, allowing the other hand to perform other tasks (for example, preventing the bolt from turning with a wrench).

[0053] The method of attaching the collar operating device 7 can be selected appropriately taking into consideration the dimensions of the collar 13 of the socket wrench 1, the dimensions of the electric rotary drive device 2, the magnitude of the torque required to tighten or loosen the fastening member, etc., and it is not necessary to adopt the form shown in Figure 11. [Example]

[0054] Next, a color manipulation tool 7 according to a sixth embodiment of the present invention will be described with reference to Fig. 12. Note that a duplicated description of points common to the fifth embodiment will be omitted.

[0055] In Example 5, the spring 14 provided in the socket wrench 1 of Example 2 biases the collar 13 forward, thereby keeping the collar 13 in the magnetically retainable position before the trigger 72 is pulled, and returning the collar 13 from the magnetically retainable release position to the magnetically retainable position after the pulled trigger 72 is released.

[0056] 5, the end of spring 14 comes into contact with flange 12d or collar 13, and if there is a difference in the rotational speed of the two, there is a possibility that the relatively hard spring 14 will scrape the relatively soft flange 12d or collar 13. Furthermore, if spring 14 is left exposed without spring cover 15, there is a possibility that a worker may be injured by coming into contact with the rotating spring 14.

[0057] In contrast to this, in this embodiment, the socket wrench 1 of embodiment 1 is used instead of the socket wrench 1 of embodiment 2, and a spring 75 is provided at the front end of the control wire 73 of the collar operating tool 7, and this spring 75 has a function equivalent to that of the spring 14 of embodiment 2. According to this embodiment having such a configuration, the following effects can be obtained.

[0058] That is, in this embodiment, in which the relatively large spring 14 is replaced with the relatively small spring 75, it is possible to reduce costs by simplifying the structure while ensuring functionality equivalent to that of embodiment 5. Also, because the flange 12d and collar 13 do not come into contact with the spring 14, damage to the flange 12d and collar 13 caused by the spring 14 does not occur. Furthermore, because the spring 75 of the collar operating tool 7 does not rotate even when the socket wrench 1 rotates, the spring 75 does not damage other components, and the operator is not injured by contact with the spring 75. [Explanation of symbols]

[0059] 1 socket wrench 11 Adapter 11a Insertion part 11b Connection part 11c Driver 12 cylinders 12a Fastening member holding portion 12b Cylindrical space 12c, 12d flange 12e groove 13 Colors 13a Permanent magnet 14 Spring 15 Spring cover 16 Thrust bearing 17 Thrust Putt 1A driver wrench 2 Electric rotary drive 21 Socket mounting part 22 Control section 23 Handle 3 Volts 31 Protrusion 3A butterfly bolt 31A Protrusion 32A Grip 4 nuts 4A Wing Nut 41A Gripping part 5 boards 6 screws 7 Color operation tool 71 Color connection part 72 Trigger 73 Control Wire 73a casing 73b inner wire 74 Main unit connection part 75 springs

Claims

1. A wrench attached to an electric rotary drive, a substantially cylindrical cylinder made of resin or non-magnetic metal; a substantially cylindrical collar that is slidable in the axial and circumferential directions on the outer peripheral surface of the cylinder and that incorporates a permanent magnet; the cylinder has a fastening member holding portion at a tip end side and a space portion that is long in the axial direction and is located further back than the fastening member holding portion, A wrench characterized in that, when the collar is positioned so that the permanent magnet and the fastening member holding portion face each other, the fastening member in the fastening member holding portion is magnetically held by the permanent magnet.

2. 2. The wrench of claim 1, The wrench is characterized in that, when the collar is placed in a position where the permanent magnet and the fastening member holding portion do not face each other, the magnetic holding force is released.

3. 2. The wrench of claim 1, the fastening member is a bolt or a nut, The fastening member holding portion is a space having a substantially hexagonal prism shape.

4. 4. The wrench according to claim 3, the fastening member is a wing bolt or a wing nut having a pair of gripping portions, The wrench is characterized in that the fastening member holding portion has grooves on its side surface that fit into the pair of gripping portions.

5. The wrench according to claim 1 or 2, A wrench comprising: a spring that biases the collar toward a position where the permanent magnet and the fastening member holding portion face each other.

6. 6. The wrench according to claim 5, The wrench has a cylindrical spring cover that covers the outer periphery of the spring.

7. The wrench according to claim 1 or 2, Further, a driver unit is provided which rotates synchronously with the cylinder, The wrench is characterized in that the tip of the driver portion is disposed within the fastening member holding portion.

8. A collar operating tool used in combination with the wrench according to claim 1 or 2, a collar connection part attached to the outer periphery of the collar; a main body connection part that is attached to the main body of the electric rotary drive; a trigger attached to the handle of the electric rotary drive; a control wire connecting the collar connection portion and the trigger, A collar operating tool characterized in that when the trigger is pulled, a force that slides the collar is transmitted via the control wire and the collar connection portion, and the magnetic retention of the fastening member in the fastening member holding portion is released.

9. 9. The color manipulation tool according to claim 8, A collar operating tool characterized in that a spring is provided at the front end of the control wire to bias the collar connecting portion forward.

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