WO2019003618A1

WO2019003618A1 - Blind nut removal tool and blind nut removal structure

Info

Publication number: WO2019003618A1
Application number: PCT/JP2018/016944
Authority: WO
Inventors: 秀彰酒井; 研一吉田
Original assignee: 豊田鉄工株式会社
Priority date: 2017-06-29
Filing date: 2018-04-26
Publication date: 2019-01-03
Also published as: JP2019010694A

Abstract

This blind nut removal tool is used to remove a blind nut from a resin member. The blind nut is provided with a flange, a shaft which extends axially from the flange, and a thread which has a thread groove in the inner peripheral surface thereof. The shaft has an increased diameter section formed by deforming the shaft so that the axial length thereof decreases, and the increased diameter section and the flange grip a peripheral edge of a mounting hole. The blind nut removal tool has: a thread engagement section configured to engage with the thread; a force application section configured to apply a force to the thread engagement section in the direction in which the increased diameter section is extended axially, the thread engagement section having engaged with the thread; and a fulcrum engagement section configured so that, when the force application section applies a force to the thread engagement section, the fulcrum engagement section engages with the blind nut or the resin member so as to function as a fulcrum.

Description

Blind nut removal tool and blind nut removal structure

The present invention relates to a blind nut removal tool and a blind nut removal structure.

When mutually fastening a member made of resin and a member made of metal, for example, a blind nut described in Patent Document 1 is used. Such a blind nut is attached to a mounting member by caulking with a dedicated tool in a state of being inserted into a mounting hole provided in advance in a mounting member made of resin or metal.

JP, 2013-234698, A

By the way, the blind nut once attached can not be removed from the mounted member unless it is scraped with a drill or the like. For example, when the blind nut is drilled, there is a possibility that the mounting hole provided in the mounting member may be deformed or damaged. When the mounting hole is deformed or damaged in this manner, the mounting member after the blind nut is removed can not be reused. Such a subject is remarkable especially when a mounting member is a resin member.

An object of the present invention is to provide a blind nut removing tool and a blind nut removing structure that enable reuse of a resin member after removing the blind nut.

The blind nut removal tool which solves the said subject is used when removing the blind nut inserted in the attachment hole which penetrates a resin member and attached to this resin member from the said resin member. The blind nut includes a flange portion having a first end surface and a second end surface, a cylindrical shaft portion axially extending from the first end surface of the flange portion, and a cylinder extending in the axial direction from a tip end of the shaft portion. And a thread portion having a thread groove on an inner circumferential surface. The shaft portion has an enlarged diameter portion formed by being deformed so as to shorten its axial length, and the enlarged diameter portion and the flange portion sandwich the peripheral edge of the mounting hole. The blind nut removal tool is configured such that the diameter-increased portion is in the axial direction with respect to a screw engagement portion configured to engage with the screw portion and the screw engagement portion engaged with the screw portion. A force application unit configured to apply a force in a direction to be extended, and the blind nut or the resin member function as a fulcrum when the force application unit applies a force to the screw engagement unit. And a fulcrum engagement configured to engage.

A blind nut removal structure that enables engagement with the above-described blind nut removal tool comprises a resin member having the mounting hole and the engagement structure. In the engagement structure, the fulcrum engagement portion engages with the blind nut or the resin member when the force applying portion applies a force to the screw engagement portion of the blind nut removal tool. Configured to allow.

(A), (b) is a perspective view which shows schematic structure of the resin member of 1st Embodiment. Sectional drawing along the II-II line of FIG.1 (b). Sectional drawing which shows schematic structure of the blind-nut removal tool of 1st Embodiment. (A) is sectional drawing along the IVa-IVa line | wire of FIG. 3, (b) is sectional drawing along the IVb-IVb line | wire of FIG. FIG. 6 is a cross-sectional view showing an initial operation of use of the blind nut removal tool of FIG. 3; (A)-(e) is sectional drawing which shows the operation | movement at the time of use of the blind-nut removal tool of FIG. The perspective view which shows schematic structure of the resin member of 2nd Embodiment. Sectional drawing which shows schematic structure of the blind-nut removal tool of 2nd Embodiment. The figure explaining the method of installation of the blind-nut removal tool of FIG. Sectional drawing which shows schematic structure of the blind-nut removal tool of 3rd Embodiment. (A)-(d) is sectional drawing which shows the operation | movement at the time of use of the same blind nut removal tool. The perspective view which shows schematic structure of the resin member of a modification. The perspective view which shows schematic structure of the resin member of a modification. The perspective view which shows schematic structure of the blind nut of a modification. FIG. 15 is a cross-sectional view taken along the line XV-XV in FIG.

First Embodiment
The first embodiment will be described below.
The resin member 10 shown in FIGS. 1A and 1B, for example, constitutes a part of a radiator core support of a vehicle. Other parts, for example, a radiator made of metal such as copper or aluminum are fixed to the resin member 10. The resin member 10 has a flat plate shape, and is formed of, for example, a resin material such as glass fiber reinforced resin in which glass fiber is mixed with polyethylene resin. A blind nut 20 having an internal thread portion is attached to the resin member 10 so as to provide an internal thread portion for fixing the other components. The blind nut 20 is made of, for example, a metal such as aluminum. The resin member 10 has two end surfaces aligned in the thickness direction, and the blind nut 20 is inserted into and attached to the resin member 10 from the side where the first end surface 10a, which is one of the two end surfaces, is located. .

The resin member 10 has a mounting hole 11 for mounting the blind nut 20. The mounting hole 11 is a circular hole penetrating the resin member 10 in the thickness direction. Two depressions 12 are formed in the first end face 10 a of the resin member 10. The recess 12 is recessed from the first end surface 10 a of the resin member 10 in the thickness direction. Further, the depressions 12 are arranged outside the mounting hole 11 in the radial direction of the mounting hole 11 and are arranged at an angular interval of 180 degrees around the axis of the mounting hole 11.

As shown in FIG. 1 (a) and FIG. 2, the blind nut 20 has a disc-like flange portion 21 having two end faces opposite to each other, and one of two end faces of the flange portion 21. It has a cylindrical shaft 22 extending in the axial direction from a first end face 21a, a screw (female screw) 25 extending in the axial direction from the tip of the shaft 22, and a bolt hole 23. The bolt hole 23 penetrates the flange portion 21, the shaft portion 22 and the screw portion 25 in the axial direction. The screw portion 25 has a screw groove 24 formed on the inner circumferential surface of the screw portion 25 and a tapered portion 25 a located between the screw groove 24 and the inner circumferential surface of the shaft portion 22. The tapered portion 25 a is a conical surface whose inner diameter decreases from the shaft portion 22 toward the screw groove 24. Such a tapered portion 25a is not limited to the blind nut 20 of the present embodiment, and is a configuration generally provided for a blind nut.

As shown in FIG. 2, the blind nut 20 is axially inserted by a dedicated tool (not shown) in a state where the shaft 22 and the screw 25 are inserted from the side where the first end face 10 a is located with respect to the mounting hole 11. It is attached to 10 of a resin member by being crimped so that force may be applied. By caulking, the shaft portion 22 between the flange portion 21 and the screw portion 25 is deformed so that the axial length is shortened and the outer diameter is enlarged. The blind nut 20 non-rotatably engages with the mounting hole 11 by so-called serration fitting.

The blind nut 20 attached to the resin member 10 has an enlarged diameter portion 26 which is a portion where the shaft portion 22 is deformed radially outward by caulking with the dedicated tool. The blind nut 20 is attached to the resin member 10 such that the peripheral edge of the attachment hole 11 is held by the enlarged diameter portion 26 and the flange portion 21.

When the blind nut 20 is attached to the resin member 10, the flange portion 21 covers a part of the two recesses 12. That is, the two recesses 12 are axially aligned with the outer edge 21 b of the flange portion 21 to form a gap between the first end face 10 a of the resin member 10 and the first end face 21 a of the flange portion 21. Do. In addition, the flange part 21 is contact | abutted to the resin member 10, without forming a clearance gap between 1st end surface 10a in the site | part in which the 2 hollow 12 is not provided.

The blind nut 20 thus attached is removed from the resin member 10 so as to be replaced with a normal blind nut, for example, when it becomes stagnant or damaged. The blind nut removal tool (hereinafter referred to as “removal tool”) 30 of the present embodiment assists the work when removing the blind nut 20 from the resin member 10.

The removal tool 30 will be described below.
As shown in FIG. 3, the removal tool 30 includes a cylindrical tool body 31 extending in the axial direction. The removal tool 30 also includes a grip 32 extending radially outward from the first end (proximal end) in the axial direction of the tool body 31. The grip 32 is a portion gripped by the operator when the removal tool 30 is used. The tool body 31 has a peripheral wall 31a, and a trigger 33 is provided on the outer peripheral surface 31b of the peripheral wall 31a. The trigger 33 extends along the direction in which the grip 32 extends. The trigger 33 is a part operated by the operator to switch the operation and stop of the removal tool 30 when the removal tool 30 is used. The trigger 33 is provided adjacent to the grip 32.

Further, two arm-like fulcrum engaging portions 34 are attached to the outer peripheral surface 31 b of the peripheral wall 31 a. The fulcrum engaging portions 34 are disposed around the tool body 31 at an angular interval of 180 degrees. The fulcrum engagement portion 34 extends along the axial direction of the tool body 31, and the tip end portion projects in the axial direction beyond the tool body 31. The fulcrum engagement portion 34 is swingably supported by a hinge 35 integrally provided on the tool main body 31 on the outer peripheral surface 31 b of the peripheral wall 31 a.

The tip of the fulcrum engaging portion 34 is provided with claws 34 a that project in directions approaching each other. The claw portion 34 a has a flat engagement surface 34 b that extends in the direction in which the claw portion 34 a protrudes and faces the hinge 35. Further, on the opposite side of the engagement surface 34b, the claw portion 34a has a tapered surface 34c which is inclined so as to approach the engagement surface 34b as it goes from the base end to the tip of the claw portion 34a. The fulcrum engaging portion 34 is connected to the outer peripheral surface 31 b of the peripheral wall 31 a of the tool main body 31 via a coil spring 36 at a base end portion which is an end portion opposite to the tip end portion provided with the claw portion 34 a . The coil spring 36 biases the fulcrum engagement portion 34 in a direction in which the claw portion 34 a approaches the tool main body 31. The biasing of the coil spring 36 causes the fulcrum engagement portion 34 to pivot with the hinge 35 as a fulcrum so that the claw portion 34 a approaches and separates from the tool main body 31.

An inner circumferential surface 31 c of the peripheral wall 31 a of the tool main body 31 forms a housing portion 38. The housing portion 38 houses a motor 37 and a force applying portion 40 that operates using the motor 37 as a drive source. In the following description, the axial direction of the tool body 31 is simply referred to as “axial direction”, and the radial direction of the tool body 31 is simply referred to as “radial direction”.

Here, the configuration of the force application unit 40 will be described in detail.
As shown in FIG. 3, the housing portion 38 houses the motor 37 at a position closer to the grip 32 than the output side portion 38 a located on the second end side (tip end side) of the tool main body 31 and the output side portion 38 a And a connecting portion 38c located between the output side portion 38a and the motor side portion 38b. The connection portion 38 c has a screw groove 39. The inner diameter of the inner circumferential surface 31 c is smaller at the connection portion 38 c having the thread groove 39 than at the output side portion 38 a and the motor side portion 38 b.

The force applying unit 40 further includes a rotating shaft 41 and an output shaft 42 screwed in a screw groove 39 provided at the connection portion 38c, and a lock pin 43 connected integrally with the motor shaft of the motor 37. Have. The rotating shaft 41 and the output shaft 42 are axially aligned so that the axis lines coincide with each other. The lock pin 43 is inserted into the rotating shaft 41 and the output shaft 42.

Specifically, as shown in FIGS. 3 and 5, the rotation shaft 41 has a cylindrical portion extending in the axial direction. In the rotation shaft 41, a pin hole 50 which penetrates the rotation shaft 41 in the axial direction is provided. On the outer peripheral surface of the rotating shaft 41, a screw groove 51 to be screwed into a screw groove 39 provided in the connection portion 38c is formed. The rotating shaft 41 extends toward the motor side portion 38b in a state of being screwed to the connection portion 38c. The screw groove 51 is provided in the range which enables the transition from the state where the rotation shaft 41 does not enter the output side portion 38a in the axial direction to the state where it enters. The axial length of the screw groove 51 is larger than the axial length of the screw groove 24.

The size of the outer diameter of the output shaft 42 changes along the axial direction. A proximal end closer to the rotation shaft 41 of the output shaft 42 has a pin groove 60 communicating with the pin hole 50. The output shaft 42 has a screw groove 61 screwed to the screw groove 39 on the outer peripheral surface of the portion where the pin groove 60 is provided. Further, the output shaft 42 has an intermediate portion extending from the screw groove 61 screwed to the connection portion 38c to the output side portion 38a while the outer diameter is expanded, and an outer diameter that is greater than that of the base end portion and the intermediate portion. It has a small tip end shaft portion and a step portion 42a which is a step surface which is generated due to an outer diameter difference between the middle portion and the tip end shaft portion. The screw groove 61 is provided in such a range that the output shaft 42 can not enter the motor side portion 38 b. The axial length of the screw groove 61 is longer than the axial length of the screw groove 24.

Of the both end walls in the axial direction of the tool main body 31, the end wall 31d which is far from the grip 32 has a through hole 31e which penetrates the end wall 31d. The tip end shaft portion of the output shaft 42 extends to a position reaching the through hole 31 e. A screw engagement portion (male screw portion) 70 is attached to the tip end shaft portion of the output shaft 42 via an attachment type attachment mechanism 62. The tip end of the screw engaging portion 70 attached to the output shaft 42 is located outside the tool main body 31. The screw engagement portion 70 is used when removing the blind nut 20, and can be replaced via an attachment mechanism 62 including a fastener 62a such as a pin. The screw engaging portion 70 is fixed to the output shaft 42 by a fixing tool 62a.

The screw engaging portion 70 has a screw groove 71 formed on the outer peripheral surface. The screw groove 71 is screwed into the screw groove 24 of the screw portion (female screw portion) 25 of the blind nut 20. The axial length of the screw groove 71 is larger than the axial length of the screw groove 24.

The lock pin 43 extends from the motor shaft of the motor 37 to the end closer to the output side portion 38 a of the screw groove 39. Further, the lock pin 43 is inserted into a pin hole 50 provided in the rotation shaft 41. The tip of the lock pin 43 inserted into the pin hole 50 passes through the pin hole 50 and is inserted into a pin groove 60 provided on the output shaft 42.

As shown in FIGS. 4A and 4B, the cross-sectional shape of the outer contour of the lock pin 43 is a polygon (in the embodiment, a triangle). As shown in FIG. 4A, the cross-sectional shape of the inner contour of the pin hole 50 provided on the rotation shaft 41 is a polygon (in this embodiment, a triangle) similar to the outer contour of the lock pin 43. There is. As shown in FIG. 4B, the cross-sectional shape of the inner contour of the pin groove 60 provided on the output shaft 42 is a polygon (in this embodiment, a triangle) similar to the outer contour of the lock pin 43. There is.

A coil spring 44 for biasing the output shaft 42 is disposed between the end wall 31 d of the tool main body 31 and the stepped portion 42 a of the output shaft 42. The coil spring 44 biases the output shaft 42 toward the rotating shaft 41.

When the motor shaft is rotated by energization of the motor 37, the lock pin 43 of the force applying unit 40 rotates integrally with the motor shaft. Thereby, the rotating shaft 41 and the output shaft 42 integrally rotate based on the rotating torque applied to the lock pin 43. When the lock pin 43 rotates with respect to the tool main body 31, the rotational torque applied to the lock pin 43 is transmitted to the rotating shaft 41 and the output shaft 42 through the pin hole 50 and the pin groove 60, and the rotating shaft 41 and the output shaft 42 move axially relative to the tool body 31.

Then, when the lock pin 43 is positively rotated by rotation (positive rotation) of the motor 37 in the first direction, the rotary shaft 41 and the output shaft 42 move in the direction in which the output shaft 42 protrudes from the tool main body 31. On the other hand, when the lock pin 43 is reversely rotated by rotation (reverse rotation) of the motor 37 in the second direction, the rotary shaft 41 and the output shaft 42 move in the direction in which the output shaft 42 retracts into the tool main body 31 Do. The rotation direction of the motor 37 is switched by the operation of the trigger 33 by the worker. Hereinafter, the moving direction along the axial direction of the rotating shaft 41 and the output shaft 42 when the lock pin 43 rotates forward is referred to as “first moving direction”. On the other hand, when the lock pin 43 is reversely rotated, the moving direction along the axial direction of the rotating shaft 41 and the output shaft 42 is referred to as "second moving direction".

When the lock pin 43 continues to rotate forward, the screw groove 61 provided on the output shaft 42 separates from the screw groove 39 provided on the connection portion 38c, and the lock pin 43 is released from the pin groove 60 provided on the output shaft 42. Get out. Thereafter, when the lock pin 43 continues to rotate, the rotary shaft 41 moves in the first movement direction while integrally rotating. In this case, even if the lock pin 43 is pulled out of the pin groove 60, the output shaft 42 is urged toward the rotating shaft 41 by the coil spring 44, so the output shaft 42 follows the movement of the rotating shaft 41 to perform the first movement. Move in the direction.

Hereinafter, the procedure for removing the blind nut 20 from the resin member 10 will be described together with the operation of the removal tool 30 in the use state.
The initial operation of the use of the removal tool 30 is shown in FIG. Prior to the initial operation, when the motor 37 of the removal tool 30 is reversely rotated by the operation of the trigger 33 by the worker, the rotary shaft 41 and the output shaft 42 move in the second movement direction. Then, the removal tool 30 is in an initial state in which the output shaft 42 is most retracted into the tool body 31. In this case, as the screw engaging portion 70 attached to the removal tool 30, one having a screw groove 71 corresponding to the effective diameter of the screw groove 24 or the size of the lead with respect to the screw portion 25 of the blind nut 20 is selected. Be done.

Then, as an initial operation, the operator inserts the screw engagement portion 70 into the bolt hole 23 of the blind nut 20, and the flange portion 21 of the blind nut 20 so that the tip end of the screw engagement portion 70 contacts the tapered portion 25a. The removal tool 30 is pressed against. At this time, in the two supporting point engaging portions 34, the tapered surfaces 34c provided on the claws 34a slide against the edge 21b of the flange 21 so that the claws 34a are separated from the tool main body 31. , Swings against the biasing force of the coil spring 36. The two fulcrum engaging portions 34 are coil springs so that the claws 34 a approach the tool main body 31 when the tapered surface 34 c passes through the edge 21 b of the flange portion 21 (indicated by a two-dot chain line in FIG. 5). It swings by the biasing force of 36. Thereby, the claw portion 34 a engages with the flange portion 21 such that the engagement surface 34 b of the claw portion 34 a abuts on the first end face 21 a of the flange portion 21.

Thus, the removal tool 30 is installed on the resin member 10 such that the flange portion 21 of the blind nut 20 is sandwiched between the two fulcrum engagement portions 34 by the initial operation of use. At this time, the claws 34 a of the two fulcrum engagement parts 34 enter two gaps formed between the edge 21 b of the flange 21 and the two depressions 12 provided in the resin member 10. , Engage with the first end face 21 a of the flange portion 21. That is, the two recesses 12 constitute an engagement structure KK that enables the two fulcrum engagement portions 34 of the removal tool 30 to engage with the blind nut 20.

When the removal tool 30 is installed on the resin member 10, the outer surface of the end wall 31 d provided on the tool main body 31 is in contact with the second end surface of the flange portion 21. At this time, the tip end of the screw engaging portion 70 attached to the output shaft 42 of the removal tool 30 is inserted into the bolt hole 23 of the blind nut 20 and is in contact with the tapered portion 25 a.

As shown in FIGS. 6 (a) to 6 (d), after the operator installs the removal tool 30 on the resin member 10, the motor 37 is rotated forward by the operation of the trigger 33 to rotate the rotation shaft 41 and the output shaft. The movement in the first movement direction of 42 is started. At this time, in the removal tool 30, the two fulcrum engagement portions 34 engaged with the blind nut 20 function as fulcrums, and the rotation of the lock pin 43 and the first movement direction of the rotation shaft 41 and the output shaft 42 are performed. It becomes possible to move. That is, the removal tool 30 applies a force for moving in the first movement direction to the screw engaging portion 70 via the force applying portion 40 including the lock pin 43, the rotating shaft 41 and the output shaft 42. In the present embodiment, the first movement direction coincides with the direction in which the enlarged diameter portion 26 of the blind nut 20 extends.

Specifically, as shown in FIG. 6A, the rotation shaft 41 and the output shaft 42 start moving in the first movement direction while rotating forward with the lock pin 43. At this time, in the removal tool 30, the two fulcrum engagement portions 34 engaged with the blind nut 20 function as fulcrums, and thread engagement is performed so that the thread engagement portion 70 enters the thread portion 25 of the blind nut 20. Apply a force to the part 70. The fulcrum engagement portion 34 engages with the blind nut 20 so as to prevent the blind nut 20 from moving relative to the removal tool 30 in the direction of the force applied to the screw engagement portion 70, ie, the first movement direction. Do. Thus, the screw engaging portion 70 enters the screw portion 25 of the blind nut 20 while being screwed into the screw groove 24 by rotating with the output shaft 42.

Subsequently, as shown in FIG. 6B, when the output shaft 42 separates from the screw groove 39 of the tool main body 31 and the lock pin 43 separates from the output shaft 42, the rotation of the output shaft 42 stops. After that, the rotary shaft 41 moves in the first movement direction while rotating forward with the lock pin 43, so the output shaft 42 pushed by the rotary shaft 41 moves in the first movement direction. When the rotation of the output shaft 42 stops, the engagement of the screw engagement portion 70 with the screw portion 25 of the blind nut 20 is completed.

Subsequently, as shown in FIG. 6C, the rotary shaft 41 further moves in the first movement direction while rotating forwardly with the lock pin 43, and the output shaft 42 performs the first movement following the movement of the rotary shaft 41. Move further in the direction. During this time, the removal tool 30 has the screw engaging portion 70 so that the two fulcrum engaging portions 34 engaged with the blind nut 20 function as fulcrums, and the enlarged diameter portion 26 of the blind nut 20 is axially extended. Apply force against. As a result, the screw engagement portion 70 is pushed by the moving output shaft 42 and deforms the enlarged diameter portion 26 of the blind nut 20 so as to extend in the axial direction. As described above, the force applying unit 40 performs the first operation in which the screw engaging unit 70 moves in the first movement direction while rotating the screw engaging unit 70, and thereafter, in the first moving direction without rotating the screw engaging unit 70. The screw engagement portion 70 is caused to perform a second movement to move. In the first operation, the screw engagement portion 70 enters the screw portion 25 of the blind nut 20, and in the second operation, the screw engagement portion 70 moves the screw portion 25 in the first movement direction to increase the diameter diameter portion 26. Extend axially.

Then, the operator stops the rotation of the motor 37 by operating the trigger 33 when the outer diameter of the enlarged diameter portion 26 decreases to a size that allows the mounting hole 11 of the resin member 10 to pass, and the rotation shaft 41 and the output shaft 42 Stop moving in the first movement direction.

Subsequently, as shown in FIG. 6 (d), the operator separates the removal tool 30 from the resin member 10 and extracts the screw portion 25 of the blind nut 20 from the mounting hole 11 of the resin member 10. Thereby, the removal of the blind nut 20 is completed.

Subsequently, as shown in FIG. 6E, the operator reversely rotates the motor 37 by the operation of the trigger 33 to start the movement of the rotation shaft 41 and the output shaft 42 in the second movement direction. The screw engagement portion 70 disengages from the threaded portion 25 of the blind nut 20 following the rotation and axial movement of the output shaft 42. Thereby, the removal tool 30 returns to the initial state.

Thereafter, the operator presses the base end portions of the two fulcrum engaging portions 34 against the biasing force of the coil spring 36 to release the engagement between the two claws 34 a and the blind nut 20. Thereby, the blind nut 20 removed from the resin member 10 is removed from the removal tool 30.

The effects of this embodiment will be described below.
(1) According to the present embodiment, when the removal tool 30 operates, the force applying unit 40 moves the screw engagement unit 70 in the first movement direction. The movement of the screw engagement portion 70 in the first movement direction causes the enlarged diameter portion 26 of the blind nut 20 to extend in the axial direction. Thus, the outer diameter of the enlarged diameter portion 26 is reduced so as to return to the original shape from the deformed state by caulking with a dedicated tool. Then, when the outer diameter of the shaft portion 22 becomes small enough to pass through the mounting hole 11 of the resin member 10, the shaft portion 22 and the screw portion 25 are extracted from the mounting hole 11 and the blind nut 20 is removed from the resin member 10. Will be able to If the blind nut 20 can be removed from the resin member 10 in this manner, for example, it is not necessary to drill the blind nut 20, so that deformation or damage of the mounting hole 11 can be suppressed. Therefore, the resin member 10 after removing the blind nut 20 can be reused.

(2) In the present embodiment, since the two supporting point engaging portions 34 enter the two recesses 12 provided in the resin member 10 and engage with the flange portion 21 of the blind nut 20, when removing the blind nut 20 The resin member 10 is less likely to be damaged. Therefore, the resin member 10 after removing the blind nut 20 can be reused.

(3) According to the present embodiment, the force application unit 40 can easily adjust the force application mode by, for example, adjusting the rotational speed of the rotation shaft 41 at the time of design. Thereby, the application aspect of the force in the force application part 40 can be optimized, and when removing the blind nut 20, the deformation or damage of the attachment hole 11 provided in the resin member 10 can be suppressed more suitably. it can.

Second Embodiment
Next, a second embodiment will be described. In addition, about the structure same as embodiment already demonstrated, the same code | symbol is attached | subjected etc. and the overlapping description is abbreviate | omitted.

As shown in FIG. 7, the resin member 10 of the present embodiment has two through holes 13 instead of the two recesses 12 as the engagement structure KK.
The resin member 10 has two through holes 13 penetrating the resin member 10 in the thickness direction. The through hole 13 is disposed radially outward of the flange portion 21 of the blind nut 20 attached to the resin member 10. The two through holes 13 have an L-shaped opening at the first end face 10 a so as to be point-symmetrical to the axis of the mounting hole 11. Each through hole 13 includes a radially extending portion 13a extending outward in the radial direction of the flange portion 21 and a circumferential direction of the flange portion 21 from the tip of the radially extending portion 13a (the first end face of the flange portion 21 in FIG. And a circumferentially extending portion 13b extending in a counterclockwise direction in plan view of 10a.

As shown in FIG. 8, in the present embodiment, the two fulcrum engagement parts 340 of the removal tool 30 have the base end parts (end parts opposite to the claw parts 340 a) at the outer peripheral surface 31 b of the peripheral wall 31 a of the tool main body 31. Are integrally fixed to the

The removal tool 30 of the present embodiment has the resin member 10 such that the claw portions 340a of the two support point engaging portions 340 engage with the circumferential extension portions 13b of the two through holes 13 as the initial operation of use. Installed in

Specifically, as shown in FIG. 9, the worker positions the claws 340 a of the two fulcrum engagement parts 340 corresponding to the radial extension parts 13 a of the two through holes 13 with the first end face 10 a. It inserts from the side (it shows with a dashed-two dotted line in FIG. 9). Then, the worker causes the claws 340 a to project from the second end surface, which is the surface on the opposite side of the first end surface 10 a of the resin member 10.

Subsequently, the worker rotates the removal tool 30 along the circumferential direction of the flange portion 21 (the direction in which the circumferential extension 13 b of the through hole 13 extends). Thereby, the engagement surface 340 b of the claw portion 340 a abuts on the second end surface of the resin member 10.

According to the present embodiment described above, in addition to the same effects as (1) and (3) of the first embodiment, the following effects can be obtained.
(4) The two supporting point engaging portions 340 of the present embodiment pass through the two through holes 13 provided in the resin member 10 and engage with the resin member 10. Therefore, when the blind nut 20 is removed from the resin member 10, the force applying portion 40 can function as a fulcrum when applying a force regardless of the shape and size of the flange portion 21. In this case, it is effective to make the blind nut 20 easy to remove.

(5) The fulcrum engagement portion 340 of the present embodiment is integrally fixed to the outer peripheral surface 31 b of the peripheral wall 31 a of the tool main body 31. That is, there is no need to adopt a configuration for operating the two supporting point engaging portions 340. Therefore, the structure which functions as a fulcrum at the time of the force provision part 40 applying force can be simplified. In this case, the occurrence of failure of the pair of fulcrum engaging portions 340 can be suppressed, which is effective in improving the durability.

Third Embodiment
Next, a third embodiment will be described. In addition, about the structure same as embodiment already demonstrated, the same code | symbol is attached | subjected etc. and the overlapping description is abbreviate | omitted.

As shown in FIG. 10, the removal tool 30 of the present embodiment includes a force application unit 400 that operates with the pressure of a gas that is a fluid (in the present embodiment, air), instead of including a motor that is a drive source. The fluid is supplied to the force applying unit 400 from a supply source 90 (drive source) provided outside the removal tool 30.

The tool main body 31 of the present embodiment constitutes a cylinder tube 410 which can be filled with air and which accommodates the force applying portion 400. The cylinder tube 410 has a hose port 410 a and an exhaust port 410 b communicating with the outside (outside air) of the cylinder tube 410. The hose port 410 a communicates with a supply hose 90 a that connects the tool body 31 to the supply source 90. The hose port 410a is disposed at a position closer to the grip 32 than the discharge port 410b.

The force applying portion 400 has a piston 430 axially reciprocable in the cylinder tube 410, and an output shaft 420 integrally fixed to the piston 430.
The piston 430 is a disk having an outer diameter substantially the same as the inner diameter of the cylinder tube 410. The output shaft 420 is a rod extending from the piston 430 toward the end wall 410c. The end wall 410 c is an end wall of the both end walls in the axial direction of the cylinder tube 410, which is far from the grip 32. The end wall 31d has a through hole 31e. The proximal end of the output shaft 420 is fixed to the piston 430, and the tip of the output shaft 420 (the end opposite to the piston 430) reaches the through hole 410d. A screw engagement portion (male screw portion) 700 is attached to the tip of the output shaft 420 via an attachment type attachment mechanism 62. The screw engagement portion 700 protrudes to the outside of the cylinder tube 410 through the through hole 410 d.

The screw engaging portion 700 is used when removing the blind nut 20, and is fixed to the output shaft 420 by a fixing tool 62a such as a pin in the mounting mechanism 62. At the tip end of the screw engaging portion 700 of the present embodiment, a push-out portion 710 that abuts on the tapered portion 25 a when inserted into the blind nut 20 is provided.

Further, a coil spring 440 for biasing the piston 430 is disposed between the end wall 410 c of the cylinder tube 410 and the piston 430. The coil spring 440 is configured to bias the piston 430 towards the grip 32. The piston 430 is configured to move axially within the cylinder tube 410 between the hose port 410a and the end wall 410c.

When supply of air into the cylinder tube 410 is started, the output shaft 420 moves axially with respect to the cylinder tube 410 together with the piston 430. The supply of air into the cylinder tube 410 and the stop of the supply are switched by the operation of the trigger 33 by the operator.

When air is supplied into the cylinder tube 410 through the hose port 410 a, the output shaft 420 moves in the direction in which the output shaft 420 protrudes from the cylinder tube 410 against the biasing force of the coil spring 440. Then, when the piston 430 reaches the discharge port 410b, air is discharged from the inside of the cylinder tube 410 through the discharge port 410b. Then, the output shaft 420 moves in the direction of being retracted into the cylinder tube 410 by the biasing force of the coil spring 440. Hereinafter, the moving direction of the output shaft 420 when air is supplied into the cylinder tube 410 is referred to as “first moving direction”. On the other hand, the movement direction of the output shaft 420 when air is discharged from the inside of the cylinder tube 410 is referred to as "second movement direction".

Hereinafter, the procedure for removing the blind nut 20 from the resin member 10 will be described together with the operation of the removal tool 30.
The initial operation of the use of the removal tool 30 is shown in FIG. Before the initial operation, air is not supplied into the cylinder tube 410 based on the operation of the trigger 33 by the operator, and the output shaft 420 of the removal tool 30 has been moved in the second movement direction It has become. That is, the output shaft 420 is in the initial state of being retracted most with respect to the cylinder tube 410. In this initial state, the piston 430 is located axially between the hose port 410a and the discharge port 410b. The screw engagement portion 700 used at this time has an extrusion portion 710 having a shape corresponding to the arrangement and shape of the taper portion 25 a of the blind nut 20.

As an initial operation, the operator inserts the screw engaging portion 700 into the blind nut 20 and places the removal tool 30 on the flange portion 21 of the blind nut 20 so that the tip end of the pushing portion 710 abuts on the tapered portion 25a. .

As shown in FIGS. 11 (a) to 11 (d), after the removal tool 30 is installed on the resin member 10, the operator supplies air into the cylinder tube 410 by operating the trigger 33, and the output shaft 420 is produced. Start moving in the first movement direction. At this time, in the removal tool 30, the two fulcrum engaging portions 34 engaged with the blind nut 20 function as fulcrums, and the output shaft 420 and the piston 430 can be moved in the first movement direction. That is, the removal tool 30 applies a force for moving the screw engagement part 700 in the first movement direction through the force application part 400 including the output shaft 420 and the piston 430. The first movement direction coincides with the direction in which the enlarged diameter portion 26 of the blind nut 20 extends.

Specifically, as shown in FIG. 11A, the output shaft 420 and the piston 430 start moving in the first moving direction. At this time, the two fulcrum engagement portions 34 engaged with the blind nut 20 function as fulcrums, and the screw engagement portion 700 pushes against the taper portion 25 a of the blind nut 20 with respect to the screw engagement portion 700. Apply a force. The pushing portion 710 of the screw engaging portion 700 pushed by the output shaft 420 starts pushing the tapered portion 25 a of the blind nut 20.

As shown in FIG. 11B, when the output shaft 420 and the piston 430 move in the first movement direction, the two fulcrum engagement parts 34 engaged with the blind nut 20 function as fulcrums and the screw engagement parts A force is applied to 700 to cause the enlarged diameter portion 26 of the blind nut 20 to axially extend. Thus, the screw engagement portion 700 causes the enlarged diameter portion 26 of the blind nut 20 to be extended by the pressing force of the output shaft 420.

Then, when the outer diameter of the enlarged diameter portion 26 decreases to a size that allows passage through the attachment hole 11 of the resin member 10, the piston 430 reaches a position closer to the end wall 410c than the discharge port 410b in the axial direction. Then, air is discharged from the inside of the cylinder tube 410 through the discharge port 410b, and the movement of the output shaft 420 and the piston 430 in the first movement direction is stopped.

Subsequently, as shown in FIG. 11C, the output shaft 420 and the piston 430 move in the second movement direction by the biasing force of the coil spring 440. When the screw engagement portion 700 moves in the second movement direction together with the output shaft 420, the push-out portion 710 is separated from the screw portion 25 of the blind nut 20. Thereby, the removal tool 30 automatically returns to the initial state of use. In this situation, the operator operates the trigger 33 to stop the supply of air into the cylinder tube 410.

Subsequently, as shown in FIG. 11D, the worker applies the biasing force of the coil spring 36 to the base end portions of the two supporting point engaging portions 34 (the end portion to which the coil spring 36 is connected). The two claws 34 a are disengaged from the blind nut 20. Thereby, the blind nut 20 is removed from the removal tool 30. Thereafter, the operator removes the screw portion 25 of the blind nut 20 from the mounting hole 11 of the resin member 10. Thereby, the removal of the blind nut 20 is completed.

According to the present embodiment described above, in addition to the same effects as (1) and (2) of the first embodiment, the following effects can be obtained.
(6) In the removal tool 30 of the present embodiment, for example, by adjusting the air supply amount at the time of design, the application mode of the force of the force application unit 400 can be easily adjusted. Thereby, the application aspect of the force by the force application part 400 can be optimized, and when removing the blind nut 20, the deformation or damage of the attachment hole 11 provided in the resin member 10 can be suppressed more suitably. it can.

(7) The removal tool 30 of this embodiment automatically returns to the initial state of use by the biasing force of the coil spring 440 after the blind nut 20 is deformed so that the enlarged diameter portion 26 extends in the axial direction. As a result, there is no need to return the removal tool 30 to its initial state of use after the blind nut 20 has been removed. Therefore, continuous use of the removal tool 30 becomes possible, and the workability can be particularly improved when the blind nut 20 is continuously removed.

The above embodiments can also be implemented in the following forms.
In place of the two recesses 12 of the first embodiment, as shown in FIG. 12, an annular recess 120 may be provided on the first end face 10 a of the resin member 10. In this case, when installing the removal tool 30 on the resin member 10, there is no need to adjust the positions of the two fulcrum engagement parts 34, which is effective in improving the workability. Similarly, instead of the two through holes 13 of the third embodiment, an annular recess 120 may be provided.

The screw engagement portion 70 of the first embodiment may be replaced with the screw engagement portion 700 of the third embodiment. In the case of this modification, the output shaft 42 may be movable in the axial direction without rotating with respect to the tool main body 31, and the pin groove 60 and the screw groove 61 may not be provided. This is applicable to the second embodiment as well.

In the first embodiment, the outer cross section of the lock pin 43 may be a polygon other than a triangle, a rectangle or a cross other than a triangle if it is not a perfect circle, or an oval (elliptical) It is also good. In this case, the cross-sectional shape of the inner periphery of the pin hole 50 or the pin groove 60 may be changed according to the cross-sectional shape of the outer periphery of the lock pin 43.

In the first embodiment, the mechanism may be changed to a mechanism for applying rotational torque to the force applying unit 40 by turning the lock pin 43 by the operator. In this case, instead of the motor shaft of the motor 37, an operating unit such as a handle that can be operated by the operator may be connected to the lock pin 43. In addition, the force application unit 40 may be configured to apply a rotational torque based on the driving force of another tool such as a drill. In this case, the lock pin 43 may be configured to be able to connect the output shaft of another tool such as a drill instead of the motor shaft of the motor 37.

As shown in FIG. 13, the two through holes 13 of the second embodiment may have a shape extending only in the radial direction of the flange portion 21 of the blind nut 20. In the case of the present modification, two fulcrum engaging portions 34 of the first embodiment may be employed as the removal tool 30 instead of the two fulcrum engaging portions 340. Even in this case, since the two supporting point engaging portions 34 can engage with the resin member 10, the same effect as (4) of the second embodiment can be obtained.

In the third embodiment, the force application unit 400 may be a mechanism that operates based on the pressure of fluid such as oil instead of air. In addition, the force application unit 400 may be a mechanism that operates based on the magnetomotive force generated by the electromagnetic coil by the current (drive power) supplied from the power source provided outside or inside the removal tool 30.

In the above embodiments, the number of the

fulcrum engaging portions

34 and 340 can be appropriately changed to, for example, three or four or more. In this case, the resin member 10 may have the depressions 12 or the through holes 13 in the same number as the number of the

fulcrum engagement portions

34, 340. The force applying portion applies a force to the screw engaging portion so that the screw engaging portion engages with the screw portion 25 of the blind nut 20, and the force applying portion 40 increases the diameter of the blind nut 20. The number of fulcrum engagement portions 34 may be one, as long as it is possible to apply a force to the screw engagement portion in the direction in which the e. The same applies to the fulcrum engagement portion 340.

In each of the above-described embodiments, as the various components, for example, the

fulcrum engaging portions

34 and 340 may be made of a resin material. In this case, in the first embodiment and the third embodiment, the fulcrum engaging portion 34 can be elastically deformed in the direction in which the claw portion 34a is separated from the tool main body 31, and the hinge 35 is not provided. it can.

In the first embodiment, when the operator installs the removal tool 30 on the resin member 10, the proximal end portions (portions to which the coil spring 36 is connected) of the two fulcrum engaging portions 34 are the coil springs 36. You may make it press against the biasing force of. In the case of this modification, the claws 34a of the two fulcrum engagement parts 34 may have a surface parallel to the engagement surface 34b on the opposite side of the engagement surface 34b.

-In each said embodiment, as shown in FIG.14 and FIG.15, instead of the resin member 10 having the two hollows 12 or the two through holes 13, the flange part 21 of the blind nut 20 is formed in the 1st end surface 21a. It may have two hollows 121. The two depressions 121 may be provided so as to be recessed in the thickness direction from the first end face 21 a of the flange portion 21. In the present modification, as in the modification shown in FIG. 12, an annular recess (groove) may be provided on the first end face 21 a of the flange portion 21. In these cases, it is not necessary to provide a recess or a through hole in the resin member 10, and the versatility of the removal tool 30 with respect to the resin member 10 can be improved.

-Each modification may be applied in combination with each other, for example, changing the number of

fulcrum engagement parts

34 and 340 to be provided, for example, three or four or more, and other configurations of the modification And may be applied in combination with each other.

Claims

A blind nut removing tool which is used when removing a blind nut inserted in a mounting hole passing through a resin member and attached to the resin member from the resin member,
The blind nut is
A flange portion having a first end face and a second end face;
A cylindrical shaft extending in the axial direction from the first end face of the flange;
A cylindrical threaded portion extending in the axial direction from a tip end of the shaft portion, the threaded portion having a threaded groove in an inner circumferential surface;
Equipped with
The shaft portion has an enlarged diameter portion formed by being deformed so as to shorten its axial length, and the enlarged diameter portion and the flange portion sandwich the peripheral edge of the mounting hole,
The blind nut removal tool is
A threaded engagement configured to engage the threaded portion;
A force applying unit configured to apply a force to the screw engagement unit engaged with the screw unit in a direction in which the enlarged diameter unit is extended in the axial direction;
A fulcrum engaging portion configured to engage with the blind nut or the resin member to function as a fulcrum when the force applying portion applies a force to the screw engaging portion;
Has a blind nut removal tool.
The blind nut or the blind nut is configured to prevent the blind nut from moving relative to the blind nut removal tool in the direction of the force applied from the force applying portion to the screw engaging portion. The blind nut removal tool according to claim 1 engaged with the resin member.
The tool further includes a tool main body configured to abut the second end surface of the flange, the screw engagement portion protrudes from the tool main to the outside, and the fulcrum engagement portion is a portion of the flange The blind nut removal tool according to claim 1, wherein the blind nut removal tool is configured to engage with a first end surface or a surface of the resin member in contact with the enlarged diameter portion.
The blind nut removing tool according to any one of claims 1 to 3, wherein the fulcrum engaging portion is configured to engage with the flange portion of the blind nut.
The blind nut removing tool according to any one of claims 1 to 3, wherein the fulcrum engaging portion is configured to engage with the resin member.
The force application unit is
A rotating shaft configured to rotate based on a driving force obtained from a driving source;
An output shaft configured to operate with the rotation of the rotation axis;
Have
The screw engagement portion is connected to the output shaft so as to operate integrally with the output shaft.
The output shaft is configured to move in a direction to extend the enlarged diameter portion when the rotation shaft is rotated in a state where the fulcrum engagement portion is engaged with the blind nut or the resin member. The blind nut removal tool according to any one of claims 1 to 5.
The force applicator has an output shaft configured to operate with the pressure of the fluid supplied from the source;
The screw engagement portion is connected to the output shaft so as to operate integrally with the output shaft.
The output shaft is configured to move in a direction to extend the enlarged diameter portion when the fluid is supplied while the fulcrum engagement portion is engaged with the blind nut or the resin member. The blind nut removal tool according to any one of claims 1 to 5.
A blind nut removal structure that enables engagement with the blind nut removal tool according to any one of claims 1 to 7, comprising:
And a resin member having the mounting hole and the engagement structure,
In the engagement structure, the fulcrum engagement portion engages with the blind nut or the resin member when the force applying portion applies a force to the screw engagement portion of the blind nut removal tool. Blind nut removal structure, configured to allow for.
The engagement structure is a recess provided in the resin member,
The blind nut removing structure according to claim 8, wherein the recess is disposed at a position corresponding to an outer edge of the flange portion in a state where the blind nut is attached to the resin member.
The engagement structure is a through hole provided in the resin member,
The blind nut removing structure according to claim 8, wherein the through hole is disposed radially outward of the flange portion in a state where the blind nut is attached to the resin member.