JP2017104933A - Tightening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to receive reaction during tightening regardless of an interval between a bolt and a nut, by solving a problem in that, in a tightening tool used in tightening a large number of bolts and nuts for joining steel materials in a high-rise building, bridge pier construction work, and so on, an engagement part conventionally provided for a tool body in order to receive reaction during tightening is engaged with adjacent bolt and nut, making it impossible to use the engagement part due to the interval between the bolt and nut.SOLUTION: A reaction receiving part 30 provided on the tool body side is configured so as to receive reaction during tightening of bolt and nut BN, by engaging with an engagement hole 40 provided in a reaction receiving plate S1.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a tightening tool used for a tightening operation for tightening a nut to a bolt, for example.

  For example, in the construction of high-rise buildings and piers, a large number of bolts and nuts are used as means for joining steel materials. A large number of bolts and nuts are tightened at regular intervals. Normally, this type of tightening operation is performed in two stages, temporary tightening and final tightening. A final tightening operation is performed in which the nut temporarily tightened by the temporary tightening machine is tightened with an appropriate torque (final tightening torque) using a predetermined tightening tool (final tightening machine). A socket for fitting a nut is attached to the tip of the output shaft of the tightening tool. By attaching a socket to a nut that has been temporarily tightened to the screw shaft of the bolt and starting the tightening tool, the nut is rotated in a certain angle tightening direction and finally tightened with a properly controlled appropriate torque. . The final tightening torque is controlled by detecting that the socket rotation angle is less than or equal to a predetermined value based on the number of rotations of the electric motor, or detecting that the current supplied to the electric motor is greater than or equal to a predetermined value. Has been done indirectly. In this final tightening operation, a large reaction (reaction force) in the anti-screw tightening direction is added to the tightening tool.

  Since this reaction is difficult for the user to receive only with his / her own force, this kind of tightening tool is devised to receive the reaction during tightening. For example, in the following patent document, a technique is disclosed in which a reaction force receiving portion provided in a tool main body is engaged with a portion different from a nut to be tightened to receive a reaction during tightening. Further, on the outer peripheral side of the socket, an engaging portion is provided in a reaction receiving sleeve provided on the tool body side so as to protrude in the direction of the direction, and this engaging portion is engaged with an adjacent bolt or nut so that the tool body is engaged. By receiving the reaction added to the nut, the nut is securely tightened with a constant tightening torque.

JP-A-3-234480

  However, in the technique disclosed in the above-mentioned patent document, the reaction force receiving portion and the portion where the reaction force receiving portion is engaged are large, and it is difficult to apply the reaction force receiving portion to a portion where a large number of bolts and nuts are tightened. In addition, in the case where the engagement portion provided in the reaction receiving sleeve is engaged with the adjacent bolt and nut to receive the reaction, it may not be able to cope when the interval between the adjacent bolt and nut is large. On the other hand, when the interval is small, the reaction receiving engaging portion may interfere with the tightening operation.

  It is an object of the present invention to be able to receive a reaction at the time of tightening with a simple configuration irrespective of the tightening interval of bolts and nuts.

  Said subject is solved by each following invention. A first invention is a tightening tool for tightening bolts and nuts as fastening means for joining a plurality of joining members to each other. This tightening tool is also called a socket wrench. In the first invention, the tightening tool includes a tool body having an electric motor. The tool body has a socket part that accommodates bolts and nuts on the inner periphery and rotates in the tightening direction by an electric motor, and a reaction receiving part that engages with the joining member and receives a reaction during tightening It has become.

  According to 1st invention, the reaction at the time of clamping | tightening is received by engaging the reaction receiving part of a tool main-body part with respect to a joining member. Since it is possible to reliably receive the reaction at the reaction receiving portion, rather than being subjected to the reaction at the time of tightening by the user's own force, the socket portion rotates in the tightening direction with a sufficient torque, and the secure tightening is performed. In addition, the reaction receiving portion of the tool main body is engaged with the joining member to receive the reaction, and the reaction receiving portion is rotated in the rotational direction (anti-tightening direction) with respect to adjacent bolts and nuts as in the past. Therefore, it is possible to receive a reaction regardless of the distance between adjacent bolts and nuts.

  According to a second invention, in the first invention, an engagement shaft portion is provided on one of the reaction receiving portion or the joining member, an engagement hole is provided on the other, and the engagement shaft portion is inserted into the engagement hole to be engaged. This is a tightening tool configured to receive a reaction during tightening.

  According to the second aspect, the engagement shaft portion enters the engagement hole and is engaged in the reaction receiving direction, so that the reaction at the time of tightening is received.

  According to a third invention, in the second invention, a reaction receiving sleeve for positioning the socket portion on the inner peripheral side is provided in the tool body portion, and an engagement shaft portion or an engagement hole as the reaction receiving portion is provided in the reaction receiving sleeve. It is a tightening tool provided.

  According to the third invention, the reaction receiving sleeve is provided on the reaction receiving sleeve arranged on the outer peripheral side of the socket portion, and the reaction receiving portion is engaged with the joining member to receive the reaction.

  A fourth invention is the tightening tool according to the third invention, wherein an engagement shaft portion as a reaction receiving portion is provided on the reaction receiving sleeve side.

  According to the fourth invention, the engagement shaft portion as the reaction receiving portion provided in the reaction receiving sleeve is inserted into the engagement hole provided in the joining member, and the reaction at the time of tightening is received.

  A fifth invention is a tightening tool according to the fourth invention, wherein the engaging shaft portion can be advanced and retracted in the output axis direction of the socket portion and is spring-biased in the advancing direction.

  According to the fifth aspect, since the engagement shaft portion is advanced by the spring biasing force and inserted into the engagement hole, the engagement shaft portion and the engagement hole are aligned with respect to the radial position with respect to the output axis. In this case, it is not necessary to align the positions in the circumferential direction. For this reason, even if the engagement shaft portion is not inserted into the engagement hole at the same time that the nut is inserted into the socket portion in the tightening operation, the engagement shaft portion is rotated at the stage where the reaction receiving sleeve rotates after receiving the reaction. It can enter into the engagement hole by the spring biasing force and can receive a reaction at this point. From this, the handling of the reaction receiving portion is facilitated, and the operability of the tightening tool can be enhanced.

It is a longitudinal cross-sectional view of the whole clamping tool which concerns on this embodiment. It is a longitudinal cross-sectional view of the socket part and the reaction receiving part which concerns on 1st Embodiment. It is a perspective view of the socket part and the reaction receiving part which concerns on 1st Embodiment. The horizontal direction in the figure is based on the user. It is a top view which shows the operation state which fastens the bolt and nut of a joining member using a fastening tool. The horizontal direction in the figure is based on the user. FIG. 5 is a cross-sectional view taken along line (V)-(V) in FIG. 4, and is a vertical cross-sectional view of a reaction receiving portion according to the first embodiment. It is a top view of the joining member corresponding to the reaction receiving part which concerns on 1st Embodiment. FIG. 7 is a cross-sectional view taken along line (VII)-(VII) in FIG. 6, and is a vertical cross-sectional view of a joining member corresponding to the reaction receiving portion according to the first embodiment. It is a longitudinal cross-sectional view of the socket part and the reaction receiving part which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view of the reaction receiving part which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view of a socket part and a reaction receiving part in 3rd Embodiment. It is a longitudinal cross-sectional view of the reaction receiving part which concerns on 3rd Embodiment. It is a longitudinal cross-sectional view of the joining member corresponding to the reaction receiving part of 3rd Embodiment.

  Next, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the tightening tool 1 of the present embodiment includes a tool main body 2 having an electric motor 10 as a driving source, a grip 3 held by a user, a controller and a power supply circuit for the electric motor 10. Etc. are provided. The tool body 2 is mainly divided into a drive unit 11 that houses a reduction gear train and a motor unit 12 that houses an electric motor 10. The body housing H of the tightening tool 1 includes a housing of the drive unit 11 (drive unit housing h11), a housing of the motor unit 12 (motor unit housing h12), a housing of the grip unit 3 (grip unit housing h3), and a power supply unit. 4 housings (power supply housing h4).

  The housing of the drive unit 11 (drive unit housing h11) is made of aluminum and has a substantially cylindrical shape that is long in the front-rear direction. A cylindrical front cylindrical portion h11a that mainly accommodates reduction gear trains (first and second planetary gear trains 17 and 18) is integrally provided at the front portion of the drive housing h11. The rear portion of the drive unit housing h11 is closed by a rear cover h11b that holds the bearing 16b. The housing of the motor unit 12 (motor unit housing h12) has a vertically long cylindrical shape extending downward from the middle in the longitudinal direction of the drive unit housing h11. The housing of the grip part 3 (grip part housing h3) extends downward from the rear part of the drive part housing h11, and is arranged substantially in parallel behind the motor part housing h12. The housing of the power supply unit 4 (power supply unit housing h4) is provided between the motor unit housing h12 and the lower part of the grip unit housing h3. The grip part housing h3 and the power supply part housing h4 have a left and right halved structure integrated with each other.

  The electric motor 10 housed in the motor housing h12 is an AC brush motor having a stator 10b around a rotor 10a. A motor shaft 10c coupled to the rotor 10a is freely rotatable by upper and lower bearings 10d and 10e. It is supported by. The electric motor 10 is accommodated in the motor unit 12 in a vertical direction in which the axis (motor axis) of the motor shaft 10c is the vertical direction. A cooling fan 10f is attached to the top of the motor shaft 10c. The cooling fan 10f rotates integrally with the motor shaft 10c when the electric motor 10 is activated. As will be described later, when the cooling fan 10f rotates, outside air is introduced into the motor housing h12, and the electric motor 10 is cooled by the introduced outside air.

  The rotational output of the electric motor 10 is transmitted to the intermediate gear shaft 14 via the intermediate gear 13. The rotational power of the intermediate gear shaft 14 is transmitted to the driven side bevel gear 15 via a driving side bevel gear 14a provided on the upper portion thereof. The driven bevel gear 15 is coupled to the intermediate drive shaft 16. The intermediate drive shaft 16 is rotatably supported by the drive unit housing h11 via front and rear bearings 16a and 16b.

  The intermediate drive shaft 16 is supported in a lateral direction with its rotation axis (output axis J) along the front-rear direction. The rotational power of the intermediate drive shaft 16 is decelerated by the three-stage planetary gear trains 17 to 19 and transmitted to the output sleeve 20. A cylindrical outer sleeve 25 is supported on the front cylindrical portion h11a of the drive portion housing h11. The outer sleeve 25 is supported by the front cylindrical portion h11a so as to be rotatable around the output axis J. The internal gears of the three-stage planetary gear trains 17 to 19 are attached to the inner surface side of the outer sleeve 25. The output sleeve 20 is rotatably supported on the inner peripheral side of the outer sleeve 25 via a bearing 21. Further, the outer sleeve 25 is supported via the bearing 21 so as to be rotatable relative to the drive unit housing h11. A socket portion 22 is coupled to the output sleeve 20. The socket portion 22 is integrated with the output sleeve 20 with respect to rotation via a spline portion 22b provided at the rear portion thereof. In the front part of the socket part 22, a tightening hole 22 a into which the head of a hex nut or a hex part bolt can be inserted is provided. An escape hole 22c for allowing the bolt to escape is provided coaxially behind the tightening hole 22a.

  An intermediate sleeve 23 is attached to the front portion of the outer sleeve 25. The intermediate sleeve 23 is connected to the outer sleeve 25 so as not to be axially displaceable and rotatable about the axis. The intermediate sleeve 23 protrudes further forward from the outer sleeve 25. An output sleeve 20 and a socket portion 22 are rotatably disposed on the inner peripheral side of the intermediate sleeve 23. A reaction receiving sleeve 24 is coupled to the intermediate sleeve 23. The reaction receiving sleeve 24 is provided with a reaction receiving portion 30 for receiving a reaction generated during tightening.

  The reaction receiving sleeve 24 is coupled to the intermediate sleeve 23 and the outer sleeve 25 so as not to move in the direction of the output axis J and not to rotate relative to the output axis J. Four uneven fitting portions 24 a are provided on the outer peripheral surface of the reaction receiving sleeve 24 on the rear side. By engaging the concave / convex fitting portion 24a with the front end surface of the intermediate sleeve 23, the reaction receiving sleeve 24 is coupled to the intermediate sleeve 23 in a state where the relative displacement in the rotational direction is restricted. Yes. Further, a screw-type lock pin is fastened to the intermediate sleeve 23 in the radial direction. The distal end portion of the lock pin enters an engagement hole provided in the reaction receiving sleeve 24. The lock pin restricts the displacement of the reaction receiving sleeve 24 in the direction of the output axis J with respect to the intermediate sleeve 23, thereby preventing the reaction receiving sleeve 24 from coming off the intermediate sleeve 23. As described above, the reaction receiving sleeve 24 is supported by the front portion (driving unit housing h11) of the main body housing H via the intermediate sleeve 23 and the outer sleeve 25 so as to be relatively rotatable and displaceable in the output axis J direction. The reaction receiving sleeve 24 can be removed from the intermediate sleeve 23 and replaced with another reaction receiving sleeve by removing the screw-type lock pin.

  A socket portion 22 is rotatably disposed on the inner peripheral side of the reaction receiving sleeve 24. Details of the socket portion 22 and the reaction receiving sleeve 24 are shown in FIGS. A reaction receiving portion 30 is provided on the outer peripheral surface of the reaction receiving sleeve 24. The reaction receiving portion 30 has a columnar pedestal portion 30 a provided integrally at one place in the circumferential direction of the outer peripheral surface of the reaction receiving sleeve 24. An engaging shaft portion 31 is integrally provided on the front surface of the pedestal portion 30a. As shown in the drawing, the engagement shaft portion 31 protrudes forward from the front end of the socket portion 22. The engagement shaft portion 31 protrudes in parallel with the output axis J. A holding sleeve 33 is interposed between the inner peripheral surface on the front side of the reaction receiving sleeve 24 and the outer peripheral surface of the socket portion 22. Since the holding sleeve 33 functions as a bearing, the socket portion 22 and the reaction receiving sleeve 24 are held concentrically and rotatably with respect to each other.

  A retaining ring 32 is attached to the inner periphery of the reaction receiving sleeve 24. The retaining ring 32 restricts the withdrawal of the reaction receiving sleeve 24 of the socket portion 22 from the inner peripheral side.

  A trigger-type switch lever 5 is provided on the upper front surface of the grip portion 3. When the switch lever 5 is pulled with the fingertip of the hand holding the grip portion 3, the main switch 6 built in the rear thereof is turned on and the electric motor 10 is activated. When the electric motor 10 is started, the socket portion 22 rotates in the screw tightening direction and the nut that has entered the tightening hole 22a is tightened to the bolt.

  An electric cord 7 for supplying power is drawn into the rear part of the power supply unit 4. As described above, the power supply unit 4 includes the controller 8 for controlling the operation of the electric motor 10. An air inlet 9 for taking in outside air is provided on the lower surface of the power source housing h4. When the cooling fan 10 f rotates together with the start of the electric motor 10, outside air is introduced from the intake port 9. The introduced outside air flows into the motor housing h12 and the electric motor 10 is cooled.

  FIGS. 4 and 5 show the actual tightening work of tightening the hexagon nut N to the hexagon bolt B using the tightening tool 1 of the present embodiment configured as described above. As shown in FIG. 5, the joining members S2 and S4 are joined to the joining member S3 from both sides by tightening the bolts and nuts BN. In the case of the present embodiment, a seat plate (reaction force receiving plate S1) for receiving a reaction force is superimposed on the outer surface side of the joining member S2, and simultaneously joined by bolts and nuts BN. For this reason, the reaction force receiving plate S1 can be regarded as a joining member that is coupled with the bolts and nuts BN in the same manner as the joining members S2, S3, and S4, although their names and functions are different. The hexagon bolt B is inserted from the joining member S4 side, and the bolt front end side protrudes to the reaction force receiving plate S1 side. A hexagonal nut N is tightened on the protruding portion, and a total of three joining members S2 to S4 and the reaction force receiving plate S1 are coupled to each other. The hexagon nut N is temporarily tightened in advance with respect to the distal end side of the hexagon bolt B. The temporarily tightened hexagon nut N is finally tightened by the tightening tool 1 at a constant angle or a constant torque.

  As shown in FIGS. 4 and 6, a total of three joining members S2 to S4 and reaction force receiving plate S1 are connected by, for example, a total of 24 bolts and nuts BN arranged in four rows vertically and six rows horizontally. Is done. The 24 bolts and nuts BN are adjacent to each other at substantially the same interval. 4 and 6, the hexagon nut N side of the bolt / nut BN is visible. An engagement hole 40 is provided between the hex nuts N adjacent to each other in the vertical direction. Each engagement hole 40 is formed with a depth and a diameter capable of inserting the engagement shaft portion 31 of the reaction receiving sleeve 24. As shown in FIG.5 and FIG.7, each engagement hole 40 is provided in the depth which penetrates only the reaction force receiving plate S1. Prior to the tightening operation, a total of 18 engagement holes 40 are provided in the reaction force receiving plate S1 in advance for a total of 24 bolts and nuts BN.

  As shown in FIG. 5, the engagement shaft portion 31 of the reaction receiving sleeve 24 as the reaction receiving portion is inserted into the engagement hole 40 when the hexagon nut N is inserted into the tightening hole 22 a of the socket portion 22 for the tightening operation. Inserted into. By inserting the engagement shaft portion 31 of the reaction receiving portion 30 into the engagement hole 40 of the reaction force receiving plate S1, which is a material to be tightened, the reaction generated when the nut is tightened is received.

  As described above, according to the tightening tool 1 of the present embodiment, the engagement shaft portion 31 of the reaction receiving sleeve 24 is inserted into the engagement hole 40 provided in the reaction force receiving plate S1 and engaged in the rotational direction. Thus, the reaction during tightening can be received. For this reason, regardless of the interval between adjacent bolts and nuts BN, it is possible to receive a reaction at the time of tightening, whereby the tightening operation can be efficiently performed while reducing the burden on the user.

  In addition, the reaction receiving portion that protrudes in the normal direction is engaged with the adjacent bolt and nut BN to receive the reaction, unlike the conventional configuration, but the engaging shaft portion 31 that protrudes in the output axis J direction is not counteracted. Since the configuration is such that the force receiving plate S1 is engaged, the reaction receiving sleeve 24 can be made compact.

  Various modifications can be made to the reaction receiving portion 30 exemplified above. 8 and 9 illustrate the reaction receiving portion 35 of the second embodiment. The reaction receiving portion 35 of the second embodiment includes a cylindrical pedestal portion 35 a provided integrally at one place in the circumferential direction of the outer peripheral surface of the reaction receiving sleeve 24. A holding hole 35b is provided in the base portion 35a. The holding hole 35b is provided at a certain depth from the front surface of the pedestal portion 35a. The engagement shaft portion 37 is supported in the holding hole 35b so as not to rattle in the radial direction but to be displaceable in the axial direction (output axis J direction). A compression spring 36 is interposed between the engagement shaft portion 37 and the bottom portion of the holding hole 35b. By this compression spring 36, the engagement shaft portion 37 is urged in a direction protruding from the holding hole 35b.

  Also in the case of the second embodiment, as in the first embodiment, the engagement holes 40 are provided between the hexagon nuts N that are temporarily tightened and are adjacent vertically and horizontally. Each engagement hole 40 is provided through only the reaction force receiving plate S1. By performing a tightening operation in a state where the engagement shaft portion 37 is inserted into the engagement hole 40, a reaction during tightening is received on the tool body portion 2 side. From this, as in the first embodiment, it is possible to receive a recoil at the time of tightening regardless of the interval between adjacent bolts and nuts BN, thereby efficiently performing the tightening operation while reducing the burden on the user. it can.

  In the case of the second embodiment, since the engagement shaft portion 37 is provided so as to be able to advance and retreat against the compression spring 36, at the stage of fitting the hexagon nut N into the tightening hole 22a, the engagement shaft portion 37 is simultaneously provided. Need not be inserted into the engagement hole 40, and the engagement shaft portion 37 is then adjusted by adjusting the position of the reaction receiving portion 35 around the output axis J by changing the direction of the outer sleeve 25 of the tool body 2 or the like. Can be inserted into the engagement hole 40 by the biasing force of the compression spring 36. Further, even when tightening is started with the engagement shaft portion 37 not inserted into the engagement hole 40, the reaction receiving sleeve 24 rotates around the output axis J at the stage of receiving the reaction, At that time, the engagement shaft portion 37 is inserted into the engagement hole 40 by the spring biasing force, and the reaction is received. From this, according to the reaction receiving part 35 of 2nd Embodiment, the handling becomes easy and it can aim at speeding-up further.

  FIG. 10 shows a reaction receiving portion 38 of the third embodiment. It is sufficient in common with 1st and 2nd embodiment, and about the member or structure which does not require a change especially, the description is abbreviate | omitted using a same sign. As in the first and second embodiments, a columnar pedestal 38 a is integrally provided on the side of the reaction receiving sleeve 24. An engagement hole 39 is provided on the front surface of the pedestal portion 38a. The engagement hole 39 is formed with a certain depth along an axis parallel to the output axis J.

  As shown in FIG. 12, in the case of the third embodiment, an engagement shaft portion 41 is provided on the reaction force receiving plate S1 side in place of the engagement hole 40 in the first and second embodiments. The engagement shaft portion 41 has a diameter (thickness) and a length that can be inserted into the engagement hole 39 of the reaction receiving portion 38. In the third embodiment, the engagement shaft portion 41 is provided in a state in which it is driven into a support hole provided in the reaction force receiving plate S1 and protrudes by a predetermined dimension in advance.

  As shown in FIG. 11, in the case of the third embodiment, the engagement shaft portion 41 is provided between the hexagon nuts N that are temporarily tightened and are adjacent to each other vertically or horizontally. When the tightening operation is performed in a state where the engagement shaft portion 41 is inserted into the engagement hole 39, a reaction at the time of tightening is received on the tool body portion 2 side. From this, as in the first and second embodiments, it is possible to receive a reaction during tightening regardless of the interval between adjacent bolts and nuts BN, thereby efficiently performing the tightening operation while reducing the burden on the user. It can be carried out.

  Moreover, although the structure which provided the reaction receiving part 30 (35, 38) in one place of the circumferential direction of the reaction receiving sleeve 24 was illustrated, it is good also as a structure provided in the circumferential direction several places. In this case, among the illustrated reaction receivers 30 (35, 38), the reaction receivers having the same form may be arranged at a plurality of locations, or the reaction receivers having different forms may be arranged in combination.

  Furthermore, as illustrated in the third embodiment, when providing a protrusion such as the engagement shaft portion 41 on the reaction force receiving plate S1 side, the outer peripheral surface of the reaction receiving sleeve 24 is not circular as illustrated. For example, it can be formed in a hexagonal shape and can be configured to receive a reaction by engaging the outer peripheral surface of the reaction receiving sleeve 24 with a protrusion. In this case as well, it is possible to receive a reaction regardless of the interval between adjacent bolts and nuts, and it is not necessary to take the trouble of inserting the engagement shaft portion into the engagement hole in the tightening operation, so that further work is required. Simplification and speed can be achieved.

  In addition, the configuration in which the engagement hole 40 or the engagement shaft portion 41 is provided in the reaction receiving plate S1 is illustrated, but the reaction receiving plate S1 is omitted and the engagement member or the engagement shaft portion is directly provided in the joining member S2. Thus, the reaction receiving portion 30 (35, 38) may be engaged.

DESCRIPTION OF SYMBOLS 1 ... Fastening tool 2 ... Tool main-body part 3 ... Grip part 4 ... Power supply part 5 ... Switch lever 6 ... Main switch 7 ... Power supply cord 8 ... Controller 9 ... Inlet H ... Main part housing h11 ... Drive part housing, h11a ... Front cylinder H11b ... rear cover h12 ... motor housing h3 ... grip housing h4 ... power supply housing 10 ... electric motor 10a ... rotor, 10b ... stator, 10c ... motor shaft, 10d, 10e ... bearing 10f ... cooling fan 11 ... Drive unit 12 ... Motor unit 13 ... Intermediate gear 14 ... Intermediate gear shaft, 14a ... Drive side bevel gear 15 ... Drive side bevel gear 16 ... Intermediate drive shafts, 16a, 16b ... Bearings 17-19 ... Planet gear train 20 ... Output Sleeve 21 ... Bearing 22 ... Socket, 22a ... Tightening hole, 22c ... Relief hole 23 ... Intermediate sleeve 24 ... Anti Receiving sleeve, 24a ... concave and convex engaging portions 25 ... outer sleeve 30 ... recoil receiving unit (first embodiment)
31 ... engaging shaft part 32 ... retaining ring 33 ... holding sleeve 35 ... reaction receiving part (second embodiment)
35a ... pedestal part, 35b ... holding hole 36 ... compression spring 37 ... engagement shaft part (second embodiment)
38 ... Reaction receiving portion (third embodiment)
39 ... engaging hole (third embodiment)
40 ... engaging hole (second embodiment)
41 ... engaging shaft (third embodiment)
S1 ... Reaction force receiving plate S2 to S4 ... Joining member BN ... Bolt / nut B ... Hexagon bolt N ... Hexagon nut

Claims (5)

A tightening tool for fastening bolts and nuts as fastening means for joining a plurality of joining members to each other, comprising a tool main body with an electric motor built therein, and the tool main body includes an inner periphery of the bolt and nut. A tightening tool including a socket portion housed on a side and rotated in a tightening direction by the electric motor, and a reaction receiving portion that is engaged with the joining member and receives a reaction during tightening. The tightening tool according to claim 1, wherein an engagement shaft portion is provided on one of the reaction receiving portion or the joining member, an engagement hole is provided on the other, and the engagement shaft portion is caused to enter the engagement hole. A tightening tool configured to receive a reaction during tightening by engaging with each other. 3. The tightening tool according to claim 2, wherein a reaction receiving sleeve for positioning the socket portion on an inner peripheral side is provided in the tool main body, and the engagement shaft portion as the reaction receiving portion or the reaction receiving sleeve is provided on the reaction receiving sleeve. Tightening tool with an engagement hole. The tightening tool according to claim 3, wherein an engagement shaft portion as the reaction receiving portion is provided on the reaction receiving sleeve side. 5. The tightening tool according to claim 4, wherein the engaging shaft portion is provided so as to be able to advance and retract in the output axis direction of the socket portion and to be spring-biased in the advance direction.

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