JP2018008353A - Fastening torque control tool, nut and bolt with fastening torque control tool, and method for fitting of fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably perform screwing and fastening with a predetermined tightening torque, to improve work efficiency at low cost, and to manage tightening torque having a high degree of freedom in usable screwing members. Provide the ingredients. SOLUTION: The tightening outer peripheral surface is provided with a fitting hole 21 which is externally fitted to a tightening outer peripheral surface formed of side portions and corner portions of a screw member such as a locking nut 4. A plurality of ratchet tongue pieces 22 that abut and hold the sides of each ratchet tongue piece 22 are provided in a spiral radial manner so as to stand up diagonally at intervals in the circumferential direction, and a recess in which the tip portion 221 of each ratchet tongue piece 22 can be fitted. A fitting portion 2 provided with a 23 and an outer peripheral surface corresponding to a tightening outer peripheral surface of the screwing member, and each ratchet tongue piece 22 is a screwing member to be fitted into the fitting hole 21. A tightening torque management tool 1 provided so that a tip portion 221 is urged and fitted into a recess 23 by a load of a tightening torque exceeding a predetermined tightening torque on the outer peripheral surface of the tightening. [Selection diagram] Fig. 2

Description

  The present invention uses a tightening torque management tool, a nut and bolt with a tightening torque management tool, and a tightening torque management tool that are used to manage the tightening torque when a nut or bolt is screwed and tightened. It is related with the attachment method of the attachment to do.

  Conventionally, when attaching an attachment to a structure by tightening a bolt inserted through the attachment with a nut, especially when attaching the attachment to a structure that does not allow the attachment to drop or a structure that generates vibration, the attachment After tightening with a torque wrench after screwing the nut into the bolt inserted into the bolt, check whether the nut is tightened properly by covering the nut with the torque wrench again. Is generally done.

  When performing the work of confirming tightening after such construction in a place where a large number of nuts are tightened, the work of rotating a torque wrench on the nut one by one and rotating it in the tightening direction is performed for each of the many nuts. Since it is necessary to carry out, it is a work which requires a lot of labor and a long time. Therefore, a tightening torque management tool has been proposed that enables tightening with a predetermined tightening torque without requiring such confirmation work (see Patent Document 1).

  This tightening torque management tool is a synthetic resin in which a cover body having a recess to be attached to a nut and a tightening body rotated in a tightening direction are integrally connected by a connecting portion that is broken by a predetermined tightening torque. The tightening body is rotated with the recess attached to the nut, and the tightening body and the nut are rotated until the connecting portion breaks. According to this tightening torque management tool, it is possible to perform nut tightening with a predetermined tightening torque by rupturing the connecting portion without performing an operation of confirming tightening by covering the nut with the torque wrench tightened again.

  Moreover, there exists a nut of patent document 2 as what can confirm clamping | tightening of another nut. In this nut, a groove is provided between the upper nut portion and the lower nut portion, the upper nut portion and the lower nut portion are connected by a connecting portion provided in the groove portion, and the connecting portion is tightened to a predetermined tightening torque or more. Is designed to break. When the nut is tightened, the connecting portion is broken by tightening at a predetermined tightening torque or more, and the upper nut portion is detached from the bolt. Therefore, the state tightened with a predetermined tightening torque is a state in which only the lower nut portion is left on the bolt, and this state can be visually confirmed from a remote position.

Japanese Patent Laid-Open No. 2001-140832 Japanese Patent Laying-Open No. 2015-224781

  By the way, in the tightening torque management tool of Patent Document 1, after tightening the nut with a predetermined tightening torque, the separated cover body covered with the nut is removed, or the separated cover body is put over the nut. When bonding with an adhesive, other work is required after the nut tightening work. If such other work is performed, it will be necessary to also perform the construction confirmation work with respect to another work, and work time will be extended correspondingly. In particular, when the work time is restricted due to intensive construction or nighttime traffic closure, it is strongly required to perform an appropriate tightening work without taking extra work time.

  In addition, when using a nut with a tightening torque control tool that has been previously covered with a nut with an adhesive and using the nut for tightening operation, cover each nut with the cover body of the tightening torque control tool. It is necessary to prepare an adhesive-attached nut in advance or to prepare such a pre-adhered expensive nut with a tightening torque management tool, leading to a decrease in work efficiency and an increase in parts cost. .

  Further, since Patent Document 2 is a nut in which an upper nut portion that is removed by breakage of a connecting portion and a lower nut portion that functions as a nut as it is are integrally formed, the nut cannot be freely selected. For example, if it is decided to use a special locking nut first, or if the height of the nut is specified, the nut of Patent Document 2 cannot be used. The tightening torque cannot be managed. Furthermore, the upper nut portion and the lower nut portion need to be made of the same material, which also limits the degree of freedom of the nut that can be used.

  The present invention is proposed in view of the above-described problems, and is capable of reliably performing screwing and fastening with a predetermined tightening torque, improving work efficiency at a low cost, and further usable screwing. It is an object of the present invention to provide a tightening torque management tool having a high degree of freedom for a member, a nut and bolt with a tightening torque management tool, and an attachment method using the tightening torque management tool.

The tightening torque management tool of the present invention has a fitting hole that is externally fitted to a tightening outer peripheral surface composed of a side portion and a corner portion of a screwing member, and the tightening outer periphery is inside the fitting hole. A plurality of ratchet tongue pieces that contact and hold the side portions of the surface are provided in a spiral radial manner so as to rise obliquely at intervals in the circumferential direction, and at least the tip portions of the ratchet tongue pieces can be fitted. A fitting portion provided with a recess, and a tightening torque introducing portion having an outer peripheral surface corresponding to the tightening outer peripheral surface of the screwing member and having a through hole communicating with the fitting hole; Are integrally formed, and each ratchet tongue piece is biased by a load of a tightening torque exceeding a predetermined tightening torque with respect to the tightening outer peripheral surface fitted in the fitting hole, and at least the tip portion Is provided so as to be fitted into the recess. That.
According to this, when the tightening torque introducing portion is rotated during tightening of the screwing member, the tightening torque is transmitted from the tightening torque introducing portion to the screwing member via the fitting portion and the ratchet tongue piece. Since the tip of the ratchet tongue fits into the recess when the tightening torque exceeds the specified value, the tightening torque management tool idles, so that the operator can easily and clearly detect the completion of tightening with the specified tightening torque. Thus, screwing with a predetermined tightening torque and accurate torque management can be reliably performed. Furthermore, the screw fastening with the predetermined tightening torque and the accurate torque management can be performed regardless of the type of method of rotating the tightening torque management tool. Even if it is gripped and fastened with a nut at high speed, it is possible to reliably perform screw fastening with a predetermined tightening torque and accurate torque management. In addition, even when the ratchet tongue fits into the recess and the tightening torque management tool idles, the fitting portion and the tightening torque introduction portion maintain the integrity without breaking. After the screw fastening, the integral tightening torque management tool can be easily removed from the screwing member. That is, it is not necessary to remove a part of the separated cover body or the like of the tightening torque management tool after the fastening or to bond the part to a screwed member such as a nut with an adhesive. Further, it is not necessary to previously bond the tightening torque management tool to a threaded member such as a nut with an adhesive. Therefore, the overall work process can be reduced and work efficiency can be increased. Moreover, an expensive nut with a tightening torque management tool including the pre-bonding operation cost is not required, and screw fastening with a predetermined tightening torque can be performed at low cost. In addition, the construction manager can easily confirm the screw fastening and construction completion with the predetermined tightening torque without trouble by simply confirming that there is no residual tightening torque management tool. The completion of construction can be easily confirmed even by visual inspection. In addition, since the tightening torque management tool can be removed as a unit after the construction without breaking, the construction management can be reliably performed by managing the number of the nuts and the number of the tightening torque management tools. Moreover, it does not require deformation or breakage of a screwed member such as a nut, and can be applied without selecting the type of screwed member such as a nut. For example, it can be applied to a special nut such as a locking nut. It is possible, has a high degree of freedom in the screwing member that can be used, and is extremely excellent in versatility. In addition, since the ratchet tongue fits into the recess and the tightening torque management tool idles, the ratchet tongue does not scrape and generate debris or powder, and cleaning of the debris and powder is unnecessary.

The tightening torque management tool of the present invention is characterized in that a drop-off preventing projection is formed at the mouth of the recess to prevent the tip of the ratchet tongue inserted into the recess from falling off.
According to this, it is possible to prevent the leading end portion of the ratchet tongue piece inserted into the recess when the screwing member is tightened, and to reliably prevent the ratchet piece from being restored to the state before the insertion. The idling state of the tightening torque management tool after performing tightening exceeding the tightening torque can be more reliably maintained.

In the tightening torque management tool according to the present invention, the ratchet tongue piece is provided so as to extend in a fitting direction of the screwing member, and the holding portion of the ratchet tongue piece is gradually inward toward the inner side of the fitting hole. It is provided with an inclination so as to protrude.
According to this, it is possible to easily press-fit the tightening outer peripheral surface of the screwing member into the fitting hole while ensuring stable holding of the tightening outer peripheral surface of the screwing member. The attachment work of screwing members such as nuts can be facilitated.

In the tightening torque management tool according to the present invention, arc-shaped slit holes extending in the circumferential direction are formed through the fitting holes in the fitting portions of the ratchet tongue pieces on the tightening torque introduction portion side. It is characterized by being.
According to this, for example, an arc-shaped slit hole is used to mold the resin mold in such a manner that a part of the resin mold is inserted into the fitting hole, or the ratchet tongue piece is movable using the slit hole. A ratchet piece in which the ceiling surface of the fitting hole and the movable portion are separated from each other can be easily formed by separating the upper side of the possible portion from the ceiling surface of the fitting hole. Moreover, since the ratchet tongue piece in which the ceiling surface and the movable part of the fitting portion are separated can be used, it is possible to freely move the ratchet tongue piece without being constrained by the ceiling surface, An operation of smoothly fitting the tip of the ratchet tongue piece into the recess can be obtained.

The nut with a tightening torque management tool according to the present invention is such that the fitting hole of the tightening torque management tool according to the present invention is fitted onto the tightening outer peripheral surface of the nut so that the tightening torque management tool and the nut are integrated. It is provided.
According to this, the fastening operation of the nut can be performed more efficiently by performing the fastening operation using the nut with the tightening torque management tool in which the tightening torque management tool and the nut are integrally provided.

The bolt with the tightening torque management tool of the present invention is such that the fitting hole of the tightening torque management tool of the present invention is externally fitted to the tightening outer peripheral surface of the bolt head so that the tightening torque management tool and the bolt are It is provided integrally.
According to this, the fastening operation of the bolt can be performed more efficiently by performing the fastening operation using the bolt with the fastening torque management tool in which the fastening torque management tool and the bolt are integrally provided.

The attachment method of the present invention is an attachment method for attaching an attachment using the tightening torque management tool of the present invention, wherein the attachment is fitted into the fitting hole of the tightening torque management tool and The nut held in contact with the ratchet tongue is screwed into the bolt shaft protruding from the attachment, and the tightening torque introducing portion is rotated and tightened, and the bolt shaft protrudes into the through hole. And applying a tightening torque that exceeds a predetermined tightening torque to insert at least the tip of the ratchet tongue into the recess at a corner of the tightening outer peripheral surface of the nut, and control the tightening torque. A second step of idling the tool, and a third step of removing the tightening torque management tool from the nut and the bolt shaft portion.
According to this, the same effect as that of the tightening torque management tool of the present invention can be obtained, and the screw tightening with the predetermined tightening torque can be surely performed regardless of the length of the bolt shaft portion protruding from the nut. It can be carried out. Moreover, the integral tightening torque management tool can be removed from the screwing member very easily by fitting the ratchet tongue into the recess and idling of the tightening torque management tool.

  According to the present invention, it is possible to reliably perform screw fastening with a predetermined tightening torque, and to improve work efficiency at a low cost. Furthermore, the freedom degree of the screwing member which can be used can be raised.

(A) is the front side perspective view of the clamping torque management tool of 1st Embodiment by this invention, (b) is the bottom side perspective view, (c) is the longitudinal cross-sectional view. (A)-(c) is bottom explanatory drawing explaining insertion of the ratchet piece of the clamping torque management tool of 1st Embodiment. The perspective view which shows the nut fitted with the fastening torque management tool of 1st Embodiment. FIG. 3 is an explanatory perspective view showing a bolt shaft protruding from an attachment and a nut fitted into the tightening torque management tool of the first embodiment screwed into the bolt shaft. (A) is the front side perspective view of the clamping torque management tool of 2nd Embodiment by this invention, (b) is the bottom side perspective view, (c) is the longitudinal cross-sectional view. (A)-(c) is bottom surface explanatory drawing explaining insertion of the ratchet piece of the clamping torque management tool of 2nd Embodiment.

[Tightening torque management tool of the first embodiment]
As shown in FIGS. 1 to 4, the tightening torque management tool 1 according to the first embodiment of the present invention includes a fitting portion 2 and a tightening torque introducing portion 3 that are integrally formed. It is integrally formed of a copolymer synthetic resin such as polyethylene or ABS resin, a synthetic resin such as engineering plastics having excellent heat resistance such as polycarbonate, or aluminum or an aluminum alloy.

  The fitting portion 2 is formed with a fitting hole 21 which is fitted on the outer peripheral surface of the fastening member, which is a nut or a bolt, in the approximate center. Inside the fitting hole 21, a plurality of ratchet tongue pieces 22 for abutting and holding the side of a tightening outer peripheral surface of a screwing member constituted by a side such as a nut or bolt head and a corner. Are provided so as to extend in the spiral radial direction opposite to the tightening direction of the right tightening so as to rise obliquely at intervals in the circumferential direction. The ratchet tongue piece 22 is connected to the inner peripheral wall of the fitting hole 21 at the root, and the upper side of the root is a movable portion. In the illustrated example, each ratchet tongue piece 22 is provided at a position corresponding to each side portion of a hex nut or a hexagonal bolt head so that each holding portion 222 abuts on each side portion.

  Inside the fitting hole 21, there is provided a recess 23 into which the tip 221 of each ratchet tongue piece 22 can be fitted. And each ratchet tongue piece 22 is urged | biased by the screwing member by the load of the fastening torque exceeding the predetermined fastening torque with respect to the fastening outer peripheral surface of the screwing member fitted to the fitting hole 21. The tip portions 221 are provided so as to be fitted into the corresponding recesses 23 respectively. Further, in the present embodiment, the hardness of the material of the integrally formed tightening torque management tool 1 is made lower than the hardness of the screwing member or the tightening outer peripheral surface thereof, and the ratchet tongue piece 22 is relatively soft. In this manner, the ratchet tongue piece 22 is urged by the screwing member so that the tip portion 221 is easily fitted into the corresponding recess 23.

  The inner peripheral surface 211 of the fitting hole 21 is formed so as to be inclined so that the inner diameter of the fitting hole 21 becomes slightly smaller toward the fitting direction of the screwing member (upward direction in FIG. 1C). . The ratchet tongue piece 22 is provided so as to extend in the insertion direction of the screwing member, and is formed at substantially the same height as a whole in the insertion direction, and is formed following the inclination of the inner peripheral surface 211. The holding portion 222 of the ratchet tongue piece 22 is provided with a slight inclination so as to gradually protrude inward toward the back side of the fitting hole 22. Further, the inner peripheral surface 211 of the fitting hole 21 is configured not to contact a corner portion 422 such as a nut or a bolt head.

  In the fitting hole 21 in which the ratchet tongue piece 22 is formed, a tightening outer peripheral surface of a screwing member composed of a side portion and a corner portion such as a nut or a bolt head portion is fitted. The tightening outer peripheral surface of the screwing member is fitted so that the ratchet tongue piece 22 abuts against a part of the side portion so as to partially hold each side portion. Any appropriate type of nuts and bolts can be used in the fitting holes 21. For example, a locking nut 4 shown in FIGS. 2B, 3 and 4 other than a normal nut is fitted. May be combined.

  The loosening prevention nut 4 has a female screw hole 41 formed on the inner side, has a substantially hexagonal tightening outer peripheral surface 42 in plan view constituted by side portions 421 and corner portions 422, and is fitted in the vicinity of the upper end of the female screw hole 41. In the state of being fitted in the joint hole 21, a leaf spring 43 is provided at a position facing the tightening torque introducing portion 3 so as to protrude inside the female screw hole 41. In the state where the bolt shaft portion is screwed into the female screw hole 41, the locking nut 4 exhibits the function of preventing the locking by deforming the plate spring 43 and engaging with the thread of the bolt shaft portion. In general, a nut having a locking function can exhibit a locking effect only when the tightening torque is accurately controlled. Therefore, the present invention is particularly effective.

  The external shape of the fitting portion 2 in plan view is appropriate. For example, the fitting portion 2 has a shape that secures a required thickness around the fitting hole 21 to obtain a stable strength. It has an outer shape. And the arcuate slit hole 24 extended in the circumferential direction is each penetrated and formed in the fitting part 2 by the side of the tightening torque introduction part 3 of the movable part of each ratchet tongue piece 22 with a fitting hole. . In addition, the fitting portion 2 on the side of the tightening torque introduction portion 3 at a portion substantially corresponding to the root of each ratchet tongue piece 22 is not open, and a non-opening portion 25 is provided.

  The tightening torque introduction part 3 has an outer peripheral surface 31 corresponding to a tightening outer peripheral surface of a screwing member that is a nut or a bolt, and is a screwing member configured by side and corner parts such as a nut or bolt head. The shape corresponds to the tightening outer peripheral surface. In the illustrated example, it is formed in a substantially regular hexagonal shape in plan view corresponding to the shape of the tightening outer peripheral surface of the nut or bolt head that is substantially regular hexagonal shape in plan view. The size of the outer peripheral surface 31 of the tightening torque introducing portion 3 is substantially the same as the size of the tightening outer peripheral surface of a nut or bolt head.

  A through hole 32 communicating with the fitting hole 21 is formed in the approximate center of the tightening torque introducing portion 3. The plan view shape and the outer diameter of the through hole 32 are appropriate as long as the bolt shaft portion protruding by screwing from the nut fitted in the fitting hole 21 is not in contact with the inner peripheral surface of the through hole 32. As shown in FIG. 4, the bolt shaft portion 5 protruding by screwing from the locking nut 4 fitted in the fitting hole 21 does not contact the inner peripheral surface of the through hole 32.

  The tightening torque management tool 1 is installed on a nut or bolt head by fitting a fitting hole 21 on a tightening outer surface of a nut to be fastened at a construction site or a tightening outer surface of a bolt head. The attached torque introducing portion 3 may be used by rotating it with a tool such as a torque wrench. For example, the fitting hole 21 of the tightening torque management tool 1 is loosened by the locking nut 4 as shown in FIG. The tightening torque management tool 1 and the nut, such as a nut with a tightening torque management tool that is externally fitted to the tightening outer peripheral surface 42 at the factory and integrally provided with the tightening torque management tool 1 and the locking nut 4, are integrated. If the nut with the tightening torque management tool provided is pre-configured, and the nut tightening operation and attachment work are performed at the construction site using the nut with the tightening torque control tool, the nut tightening operation is made more efficient and reliable. It can be carried out in a suitable manner.

  When attaching the attachment 7 using the tightening torque management tool 1 or the nut with the tightening torque management tool, for example, as shown in FIG. 4, the washer 6 is attached to the bolt shaft portion 5 protruding from the attachment 7. A bolt shaft portion that protrudes from the attachment 7 by inserting and interposing, a locking nut 4 that is fitted in the fitting hole 21 of the tightening torque management tool 1 on the outside of the washer 6 and held in contact with the ratchet tongue piece 22. 5 is screwed. Then, the tightening torque introducing portion 3 is rotated and tightened with a tool such as a torque wrench in the direction of the thick two-dot chain line arrow in FIG. It protrudes into the through hole 32. In the illustrated example, the locking nut 4 is screwed in until the tip end portion of the bolt shaft portion 5 projects outward from the through hole 32.

  Thereafter, the locking nut 4 is tightened gradually, and when the tightening torque introducing portion 3 is rotated by applying a tightening torque exceeding a predetermined tightening torque, the side portions 421 and the corner portions 422 of the locking nut 4 are rotated. The ratchet tongue 22 is deformed so as to expand in the radial direction, and the tip 221 of the ratchet tongue 22 is fitted into the recess 23 at the corner 422 of the tightening outer peripheral surface 42 of the locking nut 4, and tightening torque The management tool 1 is idled (see FIGS. 2B and 2C). In the illustrated example, the substantially cylindrical tip 221 of the ratchet tongue piece 22 is fitted in the recess 23.

  Thereafter, the tightening torque management tool 1 that has been idled is removed from the locking nut 4 and the bolt shaft 5, and the mounting of the attachment 7 by fastening the locking nut 4 is completed.

  In addition, a bolt with a tightening torque management tool in which the fitting torque 21 of the tightening torque management tool 1 and the bolt are integrally provided by fitting the fitting hole 21 of the tightening torque management tool 1 to the tightening outer peripheral surface of the bolt head. It may be configured in advance, and the bolts with tightening torque management tool may be used to perform bolt fastening and attachment work at the construction site. By performing the fastening operation using the bolt with the tightening torque management tool, it is possible to perform the bolt fastening operation more efficiently.

  According to the first embodiment, when the tightening torque introducing portion 3 is rotated during tightening of the screwing member, the tightening torque introducing portion 3 is tightened to the screwing member via the fitting portion 2 and the ratchet tongue piece 22. When the torque is transmitted and exceeds the predetermined tightening torque, the tip 221 of the ratchet tongue piece 22 is fitted into the recess 23 and the tightening torque management tool 1 is idled. Can be detected easily and clearly, and screw fastening with a predetermined tightening torque and accurate torque management can be reliably performed. Further, the screw fastening with the predetermined tightening torque and the accurate torque management can be performed regardless of the type of the method of rotating the tightening torque management tool 1, for example, a tightening torque introducing portion with an electric tool. Even if the nut 3 is gripped and fastened with a nut at high speed, it is possible to reliably perform screw fastening with a predetermined tightening torque and accurate torque management.

  Further, even when the ratchet tongue piece 22 is fitted in the recess 23 and the tightening torque management tool 1 is idle, the fitting portion 2 and the tightening torque introduction portion 3 maintain the integrity without breaking, and therefore, the predetermined The integral tightening torque management tool 1 can be easily removed from the threaded member after the threaded tightening with the tightening torque. That is, it is not necessary to remove a part of the separated cover body or the like of the tightening torque management tool 1 after the fastening or to bond the part to a screwed member such as a nut with an adhesive. Moreover, the operation | work which adhere | attaches the tightening torque management tool 1 in advance with screwing members, such as a nut, with an adhesive agent is unnecessary. Therefore, the overall work process can be reduced and work efficiency can be increased. Moreover, an expensive nut with a tightening torque management tool including the pre-bonding operation cost is not required, and screw fastening with a predetermined tightening torque can be performed at low cost.

  In addition, the construction manager can easily confirm the screw fastening and the completion of the construction with a predetermined tightening torque without any trouble just by confirming that the tightening torque management tool 1 does not remain. It is possible to easily confirm the completion of construction even visually. Moreover, since the tightening torque management tool 1 can be removed as a unit after construction without breaking, the construction management can be reliably performed by managing the number of construction nuts and the number of tightening torque management tools 1. . Further, it does not require deformation or breakage of a screwed member such as a nut, and can be applied regardless of the type of screwed member such as a nut. For example, it can be applied to a special nut such as a locking nut 4. The usable screwing member has a high degree of freedom and is extremely excellent in versatility. In addition, since the ratchet tongue piece 22 is fitted into the recess 23 and the tightening torque management tool 1 is idled, the ratchet tongue piece 22 is not scraped off, and no debris or powder is produced. Is also unnecessary.

  Further, the ratchet tongue piece 22 is provided so as to extend in the inserting direction of the screwing member, and the holding portion 222 of the ratchet tongue piece 22 is provided so as to be inclined inward so as to gradually protrude inward toward the inner side of the fitting hole 21. This makes it possible to easily press-fit the tightening outer peripheral surface of the screwing member into the fitting hole 21 while ensuring stable holding of the tightening outer peripheral surface of the screwing member. It is possible to facilitate the attaching operation of the screwing member such as the above.

  Further, the slit hole 24 is molded from a synthetic resin in such a manner that a part of the resin mold is inserted into the fitting hole using, for example, the arc-shaped slit hole 24, or the ratchet using the slit hole 24. The ratchet piece 22 in which the ceiling surface of the fitting hole 21 and the movable part are separated from each other can be easily formed by separating the upper side of the movable part of the tongue piece from the ceiling surface of the fitting hole. Moreover, since the ratchet tongue piece 22 in which the ceiling surface of the fitting portion 21 and the movable portion are separated from each other can be formed, the ratchet tongue piece 22 can freely move freely without being constrained by the ceiling surface. Thus, the operation of smoothly inserting the tip 221 of the ratchet tongue piece 22 into the recess 23 can be obtained. Further, the non-opening portion 25 can increase the rigidity of the portion substantially corresponding to the root of the ratchet tongue piece 22, and the screwing held by the tightening torque management tool 1 and the ratchet tongue piece 22 up to a predetermined tightening torque. The members can be reliably rotated together.

  Further, when a nut such as the locking nut 4 is fitted in the fitting hole 21 of the tightening torque management tool 1, the fitting hole 21 communicates with the through-hole 32 and the through-hole of the bolt shaft portion 5 is used. 32 is configured to allow projection into the opposite side of the fitting hole 21 of the through-hole 32 and the fitting hole 21 of the through-hole 32. Therefore, the length of the bolt shaft portion 5 protruding from the screwed nut is restricted. Therefore, the screw fastening with a predetermined tightening torque can be reliably performed. Further, the integrated tightening torque management tool 1 can be detached from the screwing member very easily by fitting the ratchet tongue piece 22 into the recess 23 and the idling of the tightening torque management tool 1. In this embodiment, the ratchet tongue piece 22 extends in the direction opposite to the tightening direction of the right tightening as viewed in the circumferential direction, and is appropriately designed so as to extend in the tightening direction of the right tightening. Is also possible.

[Tightening torque management tool of the second embodiment]
As shown in FIGS. 5 and 6, the tightening torque management tool 1 a according to the second embodiment of the present invention includes a fitting portion 2 a and a tightening torque introducing portion 3 similar to that of the first embodiment. The whole is integrally formed of a copolymer synthetic resin such as polypropylene, polyethylene, and ABS resin, or a synthetic resin such as engineering plastic having excellent heat resistance such as polycarbonate, or aluminum or aluminum alloy.

  In the fitting portion 2a, a fitting hole 21 that is fitted on the outer peripheral surface of the tightening member, which is a nut or a bolt, is formed in the approximate center. Inside the fitting hole 21, a plurality of ratchet tongue pieces 22a for holding and holding the side portions of the tightening outer peripheral surface of a screwing member constituted by side portions and corner portions such as nuts or bolt heads. Are spirally provided so as to rise obliquely at intervals in the circumferential direction. The ratchet tongue piece 22a is connected to the inner peripheral wall of the fitting hole 21 at the root, and the upper side of the root is a movable portion. In the illustrated example, each ratchet tongue piece 22a is provided at a position corresponding to each side portion of a hexagonal nut or a hexagonal bolt head so that each holding portion 222a abuts on each side portion.

  Inside the fitting hole 21, there is provided a recess 23a into which the tip 221a of each ratchet tongue piece 22a can be fitted. Each ratchet tongue piece 22a is urged by the screwing member by a load of a tightening torque exceeding a predetermined tightening torque with respect to the tightening outer peripheral surface of the screwing member fitted in the fitting hole 21, and the tip portion 221a is provided so as to be fitted into the corresponding recess 23a. In this embodiment, the hardness of the material of the tightening torque management tool 1 is lower than the hardness of the screwing member or the tightening outer peripheral surface.

  Further, a drop prevention protrusion 231a for preventing the tip portion 221a of the ratchet tongue piece 22a fitted in the recess 23a from dropping is formed at the mouth of the recess 23a. The drop-off prevention protrusion 231a in the illustrated example protrudes toward the corresponding ratchet tongue piece 22a at the mouth of the recess 23a located on the opposite side of the ratchet tongue piece 22a fitted in correspondence with the recess 23a. It is formed as follows.

  As in the first embodiment, the inner peripheral surface 211 of the fitting hole 21 has an inner diameter slightly smaller toward the fitting direction of the screwing member (upward direction in FIG. 5C). It is formed to be inclined. The ratchet tongue piece 22a is provided so as to extend in the insertion direction of the screwing member, and is formed at substantially the same height as a whole in the insertion direction, and is formed following the inclination of the inner peripheral surface 211. The holding portion 222 a of the ratchet tongue piece 22 a is provided with a slight inclination so as to gradually protrude inward toward the back side of the fitting hole 21. Further, the inner peripheral surface 211 of the fitting hole 21 is configured not to contact a corner portion 422 such as a nut or a bolt head.

  In the fitting hole 21 in which the ratchet tongue 22a is formed, a tightening outer peripheral surface of a screwing member composed of a side portion and a corner portion such as a nut or a bolt head portion is fitted. The tightening outer peripheral surface of the screwing member is fitted so that the ratchet tongue piece 22a abuts a part of the side part and partially holds each side part. As the nut and bolt to be fitted into the fitting hole 21, an appropriate type such as a locking nut 4 can be used.

  The outer shape of the fitting portion 2a in plan view is also appropriate, such as a substantially circular outer shape in plan view in the illustrated example, such as a shape that can secure a required thickness around the fitting hole 21 and obtain stable strength, etc. And And the arcuate slit hole 24 extended in the circumferential direction is each penetrated and formed in the fitting part 2a by the side of the fastening torque introduction part 3 of the movable part of each ratchet tongue piece 22a. . In addition, the fitting portion 2a on the tightening torque introducing portion 3 side of the portion substantially corresponding to the root of each ratchet tongue piece 22a is not opened, and a non-opening portion 25 is provided.

  Other configurations of the tightening torque management tool 1a of the second embodiment are the same as those of the tightening torque management tool 1 of the first embodiment. Furthermore, a nut with a tightening torque management tool or a bolt with a tightening torque management tool can be configured using the tightening torque management tool 1a as in the first embodiment. Further, for example, a movable portion including the tip 221a of the ratchet tongue 22a is fitted into the recess 23a at the corner 422 of the tightening outer peripheral surface 42 of the locking nut 4, and the tightening torque management tool 1a is idled (FIG. 6). The attachment 7 can be attached by the same process as in the first embodiment (see (b) and (c)).

  According to the second embodiment, the drop-out preventing protrusion 231a prevents the tip 221a of the ratchet tongue piece 22a inserted into the recess 23a when the screwing member is tightened, so that the ratchet piece 22a is in a state before being inserted. Restoration can be reliably prevented, and the idling state of the tightening torque management tool 1a after performing tightening exceeding a predetermined tightening torque can be more reliably maintained. In addition, a corresponding effect can be obtained from the configuration corresponding to the first embodiment.

[Modifications of Embodiment, etc.]
In addition to each invention and each embodiment, the invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification within the applicable range, or these It includes those specified by adding other configurations disclosed in this specification to the configuration, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained and specifying them as a superordinate concept. The following modifications are also included.

  For example, the shape and configuration of the ratchet tongue piece and recess of the fitting portion in the present invention are not limited to the ratchet tongue pieces 22 and 22a and recesses 23 and 23a of the first and second embodiments, and a plurality of ratchet tongue pieces It is appropriate as long as it is provided in a spiral radial shape so as to stand up obliquely at intervals in the circumferential direction so as to contact and hold the tightening outer peripheral surface of the screwing member, It is appropriate if it can fit the tip of the corresponding ratchet tongue.

  In the configuration in which the holding portion 222 of the ratchet tongue piece 22 and the holding portion 222a of the ratchet tongue piece 22a are provided so as to gradually protrude inward toward the back side of the fitting hole 21, The inner peripheral surface 211 is not inclined in a tapered shape, and the height of the ratchet tongue pieces 22, 22 a is increased so that the height gradually protrudes inward toward the back side of the fitting hole 21. Also good.

  The present invention can be used when, for example, an attachment such as an attachment plate or a connection plate is screwed and fastened to various structures.

DESCRIPTION OF SYMBOLS 1, 1a ... Tightening torque management tool 2, 2a ... Fitting part 21 ... Fitting hole 211 ... Inner peripheral surface 22, 22a ... Ratchet tongue piece 221, 221a ... Tip part 222, 222a ... Holding part 23, 23a ... Recessed part 231a: Drop-off prevention protrusion 24 ... Slit hole 25 ... Non-opening part 3 ... Tightening torque introduction part 31 ... Outer peripheral surface 32 ... Through hole 4 ... Loosening prevention nut 41 ... Female screw hole 42 ... Tightening outer peripheral surface 421 ... Side part 422 ... Corner part 43 ... Leaf spring 5 ... Bolt shaft part 6 ... Washer 7 ... Attachment

Claims (7)

It has a fitting hole that is externally fitted to the tightening outer peripheral surface formed by the sides and corners of the screwing member, and the side of the tightening outer peripheral surface is held in contact with the inside of the fitting hole. A plurality of ratchet tongue pieces spirally provided so as to rise obliquely at intervals in the circumferential direction, and a fitting portion provided with a recess capable of fitting at least the tip of each ratchet tongue piece; ,
A tightening torque introducing portion having an outer peripheral surface corresponding to the tightening outer peripheral surface of the screwing member and having a through hole communicating with the fitting hole is integrally formed,
Each ratchet tongue piece is urged by a load of a tightening torque exceeding a predetermined tightening torque with respect to the tightening outer peripheral surface fitted in the fitting hole, and at least the tip end portion is fitted in the recess. A tightening torque management tool characterized by being provided.   2. The tightening torque management tool according to claim 1, wherein a drop-off preventing protrusion is formed at a mouth of the recess to prevent the tip of the ratchet tongue inserted into the recess from dropping off. 3. The ratchet tongue piece is provided extending in the fitting direction of the screwing member;
3. The tightening torque management tool according to claim 1, wherein the holding portion of the ratchet tongue piece is provided to be inclined so as to gradually protrude inward toward the inner side of the fitting hole. .   The arcuate slit hole extending in the circumferential direction is formed in the fitting portion on the side of the tightening torque introduction portion of each ratchet tongue piece so as to penetrate the fitting hole, respectively. The tightening torque management tool according to any one of?   The fitting torque control tool according to any one of claims 1 to 4, wherein the fitting hole is externally fitted to a tightening outer peripheral surface of the nut, and the tightening torque management tool and the nut are integrally provided. A nut with a tightening torque control tool.   5. The tightening torque management tool according to claim 1, wherein the fitting hole is externally fitted to a tightening outer peripheral surface of a bolt head, and the tightening torque management tool and the bolt are integrally provided. A bolt with a tightening torque control tool. An attachment method for attaching an attachment using the tightening torque management tool according to any one of claims 1 to 4,
A nut fitted in the fitting hole of the tightening torque management tool and held in contact with the ratchet tongue piece is screwed into a bolt shaft portion protruding from an attachment, and the tightening torque introducing portion is rotated. Tightening the first and the first step of projecting the bolt shaft portion into the through hole;
Applying a tightening torque exceeding a predetermined tightening torque to insert at least the tip of the ratchet tongue piece into the recess at a corner of the tightening outer peripheral surface of the nut, and causing the tightening torque management tool to idle. Process,
And a third step of removing the tightening torque management tool from the nut and the bolt shaft part.

Images