JP6779569B2 - Tightening torque control tool, nuts and bolts with tightening torque control tool, and mounting method of attachments - Google Patents

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 used to control the tightening torque when screwing and tightening a nut or a bolt. Regarding the mounting method of the mounting object.

Conventionally, when attaching the attachment to a structure by tightening the bolt inserted through the attachment with a nut, especially when attaching the attachment to a structure where the attachment is not allowed to fall or where vibration occurs, the attachment After screwing the nut into the bolt inserted into the bolt and tightening it with a torque wrench, check whether each nut is tightened properly by putting the torque wrench on the tightened nut again and checking the tightening. Is commonly done.

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

This tightening torque control 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 the tightening direction are integrally connected at a connecting portion that is broken by a predetermined tightening torque. The product is manufactured by rotating the tightening body with a recess attached to the nut, and rotating the tightening body and the nut until the connecting portion breaks. According to this tightening torque management tool, the nut can be fastened with a predetermined tightening torque by breaking the connecting portion without performing the work of covering the tightened nut with the torque wrench again to confirm the tightening.

Further, there is a nut of Patent Document 2 as a nut that can confirm the tightening of another nut. In this nut, a groove is provided between the upper nut and the lower nut, and the upper nut and the lower nut are connected by the connecting portion provided in the groove, and the connecting portion is tightened by a predetermined tightening torque or more. Is designed to break. Then, 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 separated from the bolt. Therefore, in the state of being tightened with a predetermined tightening torque, only the lower nut portion is left in the bolt, and this state can be visually confirmed from a distant position.

Japanese Unexamined Patent Publication No. 2001-140832 JP-A-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 on the nut. When adhering with an adhesive, other work is required after the nut tightening work. If such other work is performed, it becomes necessary to perform construction confirmation work for the other work, and the work time is extended accordingly. In particular, when the work time is restricted due to intensive construction work or nighttime closure, it is strongly required to perform proper tightening work without spending extra work time.

In addition, when using a nut with a tightening torque control tool that has a cover body covered with an adhesive in advance for nut fastening work, cover each nut with a cover body of the tightening torque control tool. It is necessary to perform the work of adhering with an adhesive in advance, or to prepare such a nut with an expensive tightening torque control tool that has been glued in advance, which leads to a decrease in work efficiency and an increase in component cost. ..

Further, Patent Document 2 is a nut in which an upper nut portion that comes off due to a breakage of the connecting portion and a lower nut portion that functions as a nut as it is are integrally formed, so that the nut cannot be freely selected. For example, if it is decided in advance to use a special locking nut, or if the height of the nut is specified, the nut of Patent Document 2 cannot be used. In such a case, The tightening torque cannot be managed. Further, the upper nut portion and the lower nut portion must be made of the same material, which also limits the degree of freedom of the nut that can be used.

The present invention has been proposed in view of the above problems, and is capable of reliably screwing and fastening with a predetermined tightening torque, improving work efficiency at 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 in a member, nuts and bolts with a tightening torque management tool, and a method of mounting an attachment using the tightening torque management tool.

The tightening torque control tool of the present invention has a fitting hole that is externally fitted on the outer peripheral surface of the tightening formed by the side portion and the corner portion of the screwing member, and a plurality of protrusions are provided inside the fitting hole. The fitting portion provided and holding the tightening outer peripheral surface in contact with only the plurality of protrusions and the same shape corresponding to the shape and size of the tightening outer peripheral surface of the screwing member are substantially the same size. When the tightening torque introduction portion is integrally formed with the outer peripheral surface of the through hole and the through hole communicating with the fitting hole is formed, and the inner peripheral surface of the through hole is a screw member. The protrusion is formed so as not to come into contact with the bolt shaft portion protruding from the nut screwed into the fitting hole, and the protrusion exceeds a predetermined tightening torque with respect to the tightening outer peripheral surface fitted in the fitting hole. with whole are provided so as to be idle with respect to the screw member is crushed by the load of the biasing torque, the holding surface of the projection, each of the side portions of the outer peripheral surface tightening of said threaded member It is characterized in that it is provided so as to press and hold the vicinity of the center of the.
According to this, when the tightening torque introduction portion is rotated when tightening the screw member, the tightening torque is transmitted from the tightening torque introduction portion to the screw member via the fitting portion and the protrusion, and a predetermined tightening is performed. When the tightening torque is exceeded, the protrusions are crushed and the tightening torque management tool spins, so the operator can easily and clearly detect the completion of tightening with the specified tightening torque, and with the specified tightening torque. Screw fastening and accurate torque management can be performed reliably. Further, screw fastening and accurate torque management with this predetermined tightening torque can be performed regardless of the type of method for rotating the tightening torque management tool. For example, a tightening torque introduction portion is provided with an electric tool. Even if the nut is gripped and tightened at high speed, screw fastening with a predetermined tightening torque and accurate torque management can be performed. In addition, even when the protrusions are crushed and the tightening torque control tool slips, the fitting part and the tightening torque introduction part maintain integrity without breaking, so screw fastening with a predetermined tightening torque is performed. Later, the integral tightening torque control tool can be easily removed from the screwing member. That is, it is not necessary to remove a part of the cover body or the like from which the tightening torque control tool is separated after fastening, or to adhere to a screw member such as a nut with an adhesive. Further, it is not necessary to bond the tightening torque control tool to a screwing member such as a nut with an adhesive in advance. Therefore, the overall work process can be reduced and the work efficiency can be improved. In addition, an expensive nut with a tightening torque management tool, which includes the work cost of pre-adhesion, is not required, and screw fastening can be performed at a low cost with a predetermined tightening torque. In addition, the construction manager can easily and effortlessly confirm the screwing and fastening with the predetermined tightening torque and the completion of the construction only by confirming that the tightening torque management tool does not remain, and from a distance. The completion of construction can be easily confirmed visually. Further, since the tightening torque management tool can be removed as a unit after construction without breaking, it is possible to reliably manage the construction by controlling the number of construction nuts and the number of tightening torque management tools. In addition, it does not require deformation or breakage of a screw member such as a nut, and can be applied to any type of screw member such as a nut. It can also be applied to a special nut such as a locking nut. It is possible, has a high degree of freedom in the usable screwing member, and is very versatile. Further, the shape of the protrusion can be simplified by forming the protrusion by pressing and holding the vicinity of the center of the side portion of the outer peripheral surface of the tightening, and the protrusion is surely crushed when the predetermined tightening torque is exceeded. , The tightening torque control tool can be idled.

The tightening torque control tool of the present invention has a fitting hole that is externally fitted on the outer peripheral surface of the tightening formed by the side portion and the corner portion of the screwing member, and a plurality of protrusions are provided inside the fitting hole. The fitting portion provided and holding the tightening outer peripheral surface in contact with only the plurality of protrusions and the same shape corresponding to the shape and size of the tightening outer peripheral surface of the screwing member are substantially the same size. When the tightening torque introduction portion is integrally formed with the outer peripheral surface of the through hole and the through hole communicating with the fitting hole is formed, and the inner peripheral surface of the through hole is a screw member. The protrusion is formed so as not to come into contact with the bolt shaft portion protruding from the nut screwed into the fitting hole, and the protrusion exceeds a predetermined tightening torque with respect to the tightening outer peripheral surface fitted in the fitting hole. It is crushed by the load of the applied torque and is provided so as to idle as a whole with respect to the screwing member, and the holding surface of the protrusion is the respective corner portion of the tightening outer peripheral surface of the screwing member. It is characterized in that it is provided so as to engage and hold the side portions on both sides of the periphery thereof.
According to this, when the tightening torque introduction portion is rotated when tightening the screw member, the tightening torque is transmitted from the tightening torque introduction portion to the screw member via the fitting portion and the protrusion, and a predetermined tightening is performed. When the tightening torque is exceeded, the protrusions are crushed and the tightening torque management tool spins, so the operator can easily and clearly detect the completion of tightening with the specified tightening torque, and with the specified tightening torque. Screw fastening and accurate torque management can be performed reliably. Further, screw fastening and accurate torque management with this predetermined tightening torque can be performed regardless of the type of method for rotating the tightening torque management tool. For example, a tightening torque introduction portion is provided with an electric tool. Even if the nut is gripped and tightened at high speed, screw fastening with a predetermined tightening torque and accurate torque management can be performed. In addition, even when the protrusions are crushed and the tightening torque management tool slips, the fitting part and the tightening torque introduction part maintain integrity without breaking, so screw fastening with a predetermined tightening torque is performed. Later, the integral tightening torque control tool can be easily removed from the screwing member. That is, it is not necessary to remove a part of the cover body or the like from which the tightening torque control tool is separated after fastening, or to adhere to a screw member such as a nut with an adhesive. Further, it is not necessary to bond the tightening torque control tool to a screwing member such as a nut with an adhesive in advance. Therefore, the overall work process can be reduced and the work efficiency can be improved. In addition, an expensive nut with a tightening torque management tool, which includes the work cost of pre-adhesion, is not required, and screw fastening can be performed at a low cost with a predetermined tightening torque. In addition, the construction manager can easily and effortlessly confirm the screwing and fastening with the predetermined tightening torque and the completion of the construction only by confirming that the tightening torque management tool does not remain, and from a distance. The completion of construction can be easily confirmed visually. Further, since the tightening torque management tool can be removed as a unit after construction without breaking, it is possible to reliably manage the construction by controlling the number of construction nuts and the number of tightening torque management tools. In addition, it does not require deformation or breakage of a screw member such as a nut, and can be applied to any type of screw member such as a nut. It can also be applied to a special nut such as a locking nut. It is possible, has a high degree of freedom in the usable screw member, and is very versatile. Further, the protrusions engage with the corners of the outer peripheral surface of the tightening and the side portions on both sides around the corners to hold the screwing member, so that the outer peripheral surface of the tightening member can be held with a strong holding force. It is possible to obtain a highly stable holding state of the screwing member, and it is possible to surely crush the protrusion when the predetermined tightening torque is exceeded and allow the tightening torque management tool to idle.

In the tightening torque control tool of the present invention, the protrusion is provided so as to extend in the fitting direction of the screwing member, and the holding surface of the protrusion gradually protrudes inward toward the inner side of the fitting hole. It is characterized in that it is provided at an angle.
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, and to the tightening torque management tool. It is possible to facilitate the mounting work of a screw member such as a nut.

In the nut with a tightening torque control tool of the present invention, the fitting hole of the tightening torque control tool of the present invention is fitted onto the outer peripheral surface of the nut to be tightened, and the tightening torque control tool and the nut are integrally integrated. It is characterized in that it is provided.
According to this, the nut tightening work can be performed more efficiently by performing the fastening work using the nut with the tightening torque management tool in which the tightening torque management tool and the nut are integrally provided.

In the bolt with a tightening torque control tool of the present invention, the fitting hole of the tightening torque control tool of the present invention is fitted onto the outer peripheral surface of the tightening of the head of the bolt, and the tightening torque control tool and the bolt are formed. It is characterized in that it is provided integrally.
According to this, the bolt tightening work can be performed more efficiently by performing the fastening work using the tightening torque management tool-equipped bolt in which the tightening torque management tool and the bolt are integrally provided.

The mounting method of the mounting object of the present invention is a mounting method of a mounting object for mounting the mounting object using the tightening torque management tool of the present invention, and is fitted into the fitting hole of the tightening torque management tool. A nut that is abutted and held by a protrusion is screwed into a bolt shaft portion that protrudes from an attachment, and the tightening torque introduction portion is rotated and tightened, and the bolt shaft portion is projected into the through hole. The first step, the second step of applying a tightening torque exceeding a predetermined tightening torque to crush the protrusion at the corner of the tightening outer peripheral surface of the nut, and idling the tightening torque management tool, and the tightening. It is characterized by including a third step of removing the attached 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 fastening with a predetermined tightening torque is surely performed regardless of the length of the bolt shaft protruding from the nut. It can be carried out. Further, the integrated tightening torque management tool can be removed from the screwing member very easily by crushing the protrusions and idling the tightening torque management tool.

According to the present invention, screw fastening can be reliably performed with a predetermined tightening torque, and the protrusions are reliably crushed when the predetermined tightening torque is exceeded, and the tightening torque management tool idles. The integral tightening torque control tool can be removed from the screwing member very easily. In addition, work efficiency can be improved at low cost. Further, the degree of freedom of the screwing member that can be used can be increased.

(A) is a front perspective view of the tightening torque management tool of the first embodiment according to the present invention, (b) is a bottom perspective view thereof, and (c) is a vertical sectional view thereof. (A) to (c) are bottom explanatory views explaining the crushing of the protrusion of the tightening torque management tool of the first embodiment. The perspective view which shows the tightening torque management tool of 1st Embodiment and a nut which is fitted. An explanatory perspective view showing a bolt shaft portion protruding from an attachment and a nut fitted into the tightening torque management tool of the first embodiment screwed thereto. (A) is a front perspective view of the tightening torque management tool of the second embodiment according to the present invention, (b) is a bottom perspective view thereof, and (c) is a vertical sectional view thereof. (A) to (c) are bottom explanatory views explaining the crushing of the protrusion of the tightening torque management tool of the second embodiment.

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

The fitting portion 2 is formed with a fitting hole 21 that is externally fitted on the outer peripheral surface of the screwing member, which is a nut or a bolt, at substantially the center. Inside the fitting hole 21, a protrusion 22 for contacting and holding the tightening outer peripheral surface of the screwing member composed of the side portion and the corner portion such as the nut or bolt head is provided, and the first embodiment is provided. The protrusion 22 is provided so as to press and hold the side portion of the tightening outer peripheral surface of the screwing member composed of the side portion and the corner portion of the nut or bolt head. In the illustrated example, each protrusion 22 is provided at a position corresponding to the center of each side portion of the hexagon nut or hexagonal bolt head so that each holding surface 221 abuts on each side portion.

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 is slightly smaller toward the fitting direction of the screwing member (upward in FIG. 1C). .. The protrusion 22 is provided so as to extend in the fitting direction of the screwing member, is formed at substantially the same height as a whole over the fitting direction, and is formed following the inclination of the inner peripheral surface 211. The holding surface 221 of the above is provided so as to be slightly inclined so as to gradually project inward toward the inner side of the fitting hole 22.

In the fitting hole 21 in which the protrusion 22 is formed, a tightening outer peripheral surface of a screwing member composed of side portions and corner portions such as a nut or bolt head is fitted, and each side portion of the tightening outer peripheral surface is fitted. The tightening outer peripheral surface of the screwing member is fitted so that the protrusion 22 abuts only a part (near the center) of the screw member so as to press the protrusion 22 and partially holds each side portion. An appropriate type of nut or bolt to be fitted into the fitting hole 21 can be used. For example, a locking nut 4 shown in FIGS. 2B, 3 and 4 other than a normal nut is fitted. You may match.

The locking nut 4 has a female screw hole 41 formed inside, has a substantially hexagonal tightening outer peripheral surface 42 in a plan view composed of a side portion 421 and a corner portion 422, and is fitted near the upper end of the female screw hole 41. In the state of being fitted into the joint hole 21, the leaf spring 43 is provided at a position facing the female screw hole 41 so as to protrude inside the tightening torque introduction portion 3 side. The locking nut 4 exerts a locking function by deforming the leaf spring 43 and engaging with the thread of the bolt shaft portion in a state where the bolt shaft portion is screwed into the female screw hole 41. In general, a nut having an anti-loosening function can exhibit an anti-loosening effect only when the tightening torque is properly controlled, and thus the present invention exerts a particularly effective effect.

Further, the protrusion 22 has a tightening torque that exceeds a predetermined tightening torque with respect to the tightening outer peripheral surface of the screw member composed of the side portions and corner portions of the nut or bolt head fitted in the fitting hole 21. It is provided so as to be crushed by the load of. In the present embodiment, the hardness of the material of the integrally formed tightening torque control tool 1 is made lower than the hardness of the screwing member or the hardness of the tightening outer peripheral surface thereof so that the protrusion 22 is relatively soft. , It is configured to be crushed by a load of tightening torque exceeding a predetermined tightening torque on the tightening outer peripheral surface of the screw member.

The outer shape of the fitting portion 2 in a plan view is appropriate, but for example, the shape is such that a required wall thickness is secured around the fitting hole 21 to obtain stable strength, and in the illustrated example, it is substantially circular in a plan view. It has an outer shape.

The tightening torque introduction portion 3 has an outer peripheral surface 31 corresponding to the tightening outer peripheral surface of the screwing member which is a nut or bolt, and is a screwing member composed of side portions and corner portions such as a nut or bolt head. It has a shape corresponding to the outer peripheral surface of the tightening. In the illustrated example, it is formed in a substantially regular hexagon in a plan view corresponding to the shape of the tightening outer peripheral surface of the nut or bolt head which is a substantially regular hexagon in a plan view. Further, the size of the outer peripheral surface 31 of the tightening torque introduction portion 3 is substantially the same as the size of the tightening outer peripheral surface of the nut, bolt head, or the like.

A through hole 32 communicating with the fitting hole 21 is formed at substantially the center of the tightening torque introduction portion 3. The plan-view shape and outer diameter of the through hole 32 are appropriate as long as the bolt shaft portion protruding from the nut fitted in the fitting hole 21 by screwing does not come into contact with the inner peripheral surface of the through hole 32, for example. As shown in FIG. 4, the bolt shaft portion 5 protruding from the locking nut 4 fitted in the fitting hole 21 by screwing does not come into contact with the inner peripheral surface of the through hole 32. Further, the inner peripheral surface 211 of the fitting hole 21 is configured so as not to come into contact with the corner portion 422 such as the nut or bolt head.

The tightening torque control tool 1 is installed on the nut or bolt head by externally fitting the fitting hole 21 on the tightening outer peripheral surface of the nut or the tightening outer peripheral surface of the bolt head to be fastened at the construction site, and tightening. The torque introduction unit 3 may be used by rotating it with a tool such as a torque wrench. For example, as shown in FIG. 2B, the fitting hole 21 of the tightening torque control tool 1 is provided with a locking nut 4. The tightening torque control tool 1 and the nut are integrally provided, such as a nut with a tightening torque control tool that is externally fitted to the tightening outer peripheral surface 42 at the factory and is integrally provided with the tightening torque control tool 1 and the locking nut 4. If the nut with the tightening torque control tool is configured in advance and the nut with the tightening torque control tool is used to fasten the nut and attach the attachment at the construction site, the nut fastening work will be more efficient and reliable. It can be done and is suitable.

When attaching the attachment 7 using the tightening torque control tool 1 or the nut with the tightening torque control tool, for example, as shown in FIG. 4, the washer 6 is removed from the bolt shaft portion 5 protruding from the attachment 7. A locking nut 4 that is inserted and intervened and fitted in the fitting hole 21 of the tightening torque control tool 1 on the outside of the washer 6 and is abutted and held by the protrusion 22 is attached to the bolt shaft portion 5 protruding from the attachment 7. Screw in. Then, the tightening torque introduction 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. 2 (b), and the locking nut 4 is screwed in to advance the screwing of the bolt shaft portion 5. It is projected inside the through hole 32. In the illustrated example, the lock nut 4 is screwed in from the through hole 32 until the tip portion of the bolt shaft portion 5 projects outward.

After that, the locking nut 4 is gradually tightened, and when a tightening torque exceeding a predetermined tightening torque is applied to rotate the tightening torque introduction portion 3, the corner portion of the tightening outer peripheral surface 42 of the locking nut 4 is rotated. The protrusion 22 is crushed in or around 422 to become a crushed protrusion 22 m, and since there is a gap between the protrusion 22 and the protrusion 22 that does not come into contact with the corner portion 422, the tightening torque control tool 1 idles (FIG. 2). (B), (c)). At this time, when the tightening torque control tool 1 and its protrusion 22 are made of synthetic resin, and when the protrusion 22 is crushed, not only the protrusion 22 is deformed but also a part of the protrusion 22 is scraped to generate powder. It is also possible to confirm the work of tightening the locking nut 4 by applying a tightening torque exceeding a predetermined tightening torque due to the residual powder.

After that, the tightening torque control tool 1 that is in an idling state is removed from the locking nut 4 and the bolt shaft portion 5, and the attachment 7 is completed by fastening the locking nut 4.

A bolt with a tightening torque control tool is provided by fitting the fitting hole 21 of the tightening torque control tool 1 to the outer peripheral surface of the tightening head of the bolt and integrally providing the tightening torque control tool 1 and the bolt. It may be configured in advance, and the bolts may be fastened and the attachments may be attached at the construction site using the bolts with the tightening torque control tool. By performing the fastening work using the bolt with the tightening torque management tool, the bolt tightening work can be performed more efficiently.

According to the first embodiment, when the tightening torque introducing portion 3 is rotated when tightening the screwing member, the tightening torque introducing portion 3 is screwed with the locking nut 4 and the like via the fitting portion 2 and the protrusion 22. The tightening torque is transmitted to the member, and when the predetermined tightening torque is exceeded, the protrusion 22 is crushed and the tightening torque management tool 1 idles, so that the operator can easily complete the tightening with the predetermined tightening torque. Moreover, it can be clearly detected, screw fastening with a predetermined tightening torque, and accurate torque management can be performed reliably. Further, screw fastening and accurate torque management with the predetermined tightening torque can be performed regardless of the type of method for rotating the tightening torque management tool 1. For example, a tightening torque introduction unit using an electric tool. Even if the nut 3 is gripped and the nut is tightened at a high speed, screw fastening with a predetermined tightening torque and accurate torque management can be performed.

Further, even when the protrusion 22 is crushed and the tightening torque management tool 1 idles, the fitting portion 2 and the tightening torque introducing portion 3 maintain their integrity without breaking, so that the tightening torque can be determined. After the screwing is fastened, the integrated tightening torque management tool 1 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 control tool 1 after fastening, or to adhere to a screwing member such as a nut with an adhesive. Further, it is not necessary to bond the tightening torque control tool 1 to a screwing member such as a nut with an adhesive in advance. Therefore, the overall work process can be reduced and the work efficiency can be improved. In addition, an expensive nut with a tightening torque management tool, which includes the work cost of pre-adhesion, is not required, and screw fastening can be performed at a low cost with a predetermined tightening torque.

In addition, the construction manager can easily and effortlessly confirm the screwing and fastening with the predetermined tightening torque and the completion of the construction only by confirming that the tightening torque control tool 1 does not remain, and is far away. The completion of construction can be easily confirmed by visual inspection. Further, since the tightening torque management tool 1 can be removed as a unit after construction without breaking, it is possible to reliably manage the construction by managing the number of construction nuts and the number of tightening torque management tools. Further, it does not require deformation or breakage of a screw member such as a nut, and can be applied to any type of screw member such as a nut. For example, it can be applied to a special nut such as a locking nut 4. It is also possible, has a high degree of freedom in the screwing member that can be used, and is extremely versatile.

Further, by providing the protrusion 22 so as to press and hold the side portion of the tightening outer peripheral surface, the shape of the protrusion 22 can be simplified and the allowable range of the dimensional error of the molded protrusion 22 can be expanded. Can be done. Further, the protrusion 22 is provided so as to extend in the fitting direction of the screwing member, and the holding surface 221 of the protrusion 22 is provided so as to gradually protrude inward toward the inner side of the fitting hole 21 so as to be screwed. While ensuring stable holding of the tightening outer peripheral surface of the member, the tightening outer peripheral surface of the screwing member can be easily press-fitted into the fitting hole 21, and a nut or the like is screwed into the tightening torque control tool 1. It is possible to facilitate the mounting work of the member.

Further, when a nut such as a locking nut 4 is fitted into the fitting hole 21 of the tightening torque control tool 1 and used, the fitting hole 21 communicates with the through hole 32 and the through hole of the bolt shaft portion 5 is used. Since it is configured to allow protrusion into the 32 and protrusion of the through hole 32 to the opposite side of the fitting hole 21, the length of the bolt shaft portion 5 protruding from the screwed nut is restricted. However, it is possible to reliably perform screw fastening with a predetermined tightening torque. Further, by crushing the protrusion 22 and idling the tightening torque management tool 1, the integrated tightening torque management tool 1 can be very easily removed from the screwing member after mounting the attachment.

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

The fitting portion 2a is formed with a fitting hole 21 that is externally fitted on the outer peripheral surface of the screwing member that is a nut or a bolt at substantially the center. Inside the fitting hole 21, a protrusion 22a for contacting and holding the tightening outer peripheral surface of the screwing member composed of the side portion and the corner portion of the nut or bolt head is provided, and the second embodiment. The protrusion 22a in the above is provided so as to engage and hold the corner portion of the tightening outer peripheral surface of the screwing member composed of the side portion and the corner portion of the nut or bolt head. In the illustrated example, each protrusion 22a is provided at a position corresponding to each corner of the hexagon nut or hexagonal bolt head so as to engage only around each corner, and the holding surface 221a of the protrusion 22a is a corner. It is designed to come into contact with the part and its surroundings.

Similar to the first embodiment, the inner peripheral surface 211 of the fitting hole 21 has an inner diameter of the fitting hole 21 slightly smaller in the fitting direction of the screwing member (upward in FIG. 5C). It is formed with an inclination of. The protrusion 22a is provided so as to extend in the fitting direction of the screwing member, is formed at substantially the same height as a whole, and is formed following the inclination of the inner peripheral surface 211, whereby the holding surface 221a of the protrusion 22a is formed. It is provided so as to be slightly inclined so as to gradually project inward toward the inner side of the fitting hole 21.

The fitting hole 21 in which the protrusion 22a is formed is fitted with a tightening outer peripheral surface of a screwing member composed of side portions and corner portions such as a nut or bolt head, and each corner portion of the tightening outer peripheral surface. The tightening outer peripheral surface of the screwing member is fitted so that the protrusion 22a engages only with the periphery to hold each corner. Further, the inner peripheral surface 211 of the fitting hole 21 is configured such that a gap that does not contact the side portion 421 of the nut or bolt head is partially formed. As the nuts and bolts to be fitted into the fitting holes 21, it is possible to use appropriate types such as loosening prevention nuts 4.

The protrusion 22a is also a load of a tightening torque exceeding a predetermined tightening torque on the tightening outer peripheral surface of the screwing member composed of the sides and corners of the nut or bolt head fitted in the fitting hole 21. It is provided so as to be crushed by. In the present embodiment, the hardness of the material of the integrally formed tightening torque control tool 1a is made lower than the hardness of the screwing member or the hardness of the tightening outer peripheral surface thereof so that the protrusion 22a is relatively soft. , It is configured to be crushed by a load of tightening torque exceeding a predetermined tightening torque on the tightening outer peripheral surface of the screw member.

Other configurations of the tightening torque control tool 1a of the second embodiment are the same as those of the tightening torque control tool 1 of the first embodiment. Further, the tightening torque management tool 1a can be used to form a nut with a tightening torque management tool or a bolt with a tightening torque management tool as in the first embodiment. Further, for example, the protrusion 22a is crushed into the corner portion 422 of the tightening outer peripheral surface 42 of the locking nut 4 and its periphery to form a crushed protrusion 22n, and there is a gap between the protrusion 22a and the protrusion 22a that does not contact the side portion 421. Since it exists, the attachment 7 can be attached by the same process as in the first embodiment, such as idling the tightening torque control tool 1a (see FIGS. 6B and 6C). At this time, when the tightening torque control tool 1a and its protrusion 22a are made of synthetic resin, and when the protrusion 22a is crushed, not only the protrusion 22a is deformed but also a part of the protrusion 22a is scraped to generate powder. It is also possible to confirm the work of tightening the locking nut 4 and the like by applying a tightening torque exceeding a predetermined tightening torque due to the residual powder.

According to the second embodiment, the protrusion 22a engages with the corners of the tightening outer peripheral surface of the screwing member to hold the screwing member, so that the tightening outer peripheral surface of the screwing member such as the locking nut 4 is held. It can be held with a strong holding force, a highly stable holding state of the screw member can be obtained, and the nut or bolt head and the fitting portion 2a can be interlocked with high stability at the time of tightening. it can. In addition, the corresponding effect can be obtained from the configuration corresponding to the first embodiment.

[Modified examples of embodiments]
The invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification to the extent applicable, in addition to each invention and each embodiment, or these. It includes a configuration specified by adding other configurations disclosed in the present specification, or a super-conceptualized configuration specified by deleting these partial configurations to the extent that a partial effect can be obtained. , Also includes the following modifications.

For example, the protrusion 22 of the first embodiment and the protrusion 22a of the second embodiment have a shape of a ridge extending in the fitting direction of the screwing member, but the shape is not limited to this, and for example, a point-shaped protrusion 22 is formed in the fitting direction. A plurality of point-shaped protrusions 22 are provided so as to correspond to each side portion of the tightening outer peripheral surface of the screwing member, or a plurality of point-shaped protrusions 22a are provided apart in the fitting direction. The point-shaped protrusions 22a group and the point-shaped protrusions 22a group can be configured to engage with each other so as to sandwich each corner of the tightening outer peripheral surface of the screwing member.

Further, in the configuration in which the holding surface 221 of the protrusion 22 and the holding surface 221a of the protrusion 22a are provided so as to gradually protrude inward toward the inner side of the fitting hole 21, the inner peripheral surface 211 of the fitting hole 21 is provided. May be configured such that the heights of the protrusions 22 and the protrusions 22a are gradually increased inward toward the inner side of the fitting hole 21 without being inclined in a tapered shape.

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

1, 1a ... Tightening torque control tool 2, 2a ... Fitting part 21 ... Fitting hole 211 ... Inner peripheral surface 22, 22a ... Protrusion 22m, 22n ... Crushing protrusion 221, 221a ... Holding surface 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 (6)

It has a fitting hole that is fitted on the outer peripheral surface of the tightening member that is composed of the sides and corners of the screwing member, and a plurality of protrusions are provided inside the fitting hole. A fitting part that abuts and holds the outer peripheral surface of the tightening ,
Tightening torque having an outer peripheral surface having the same shape and substantially the same size as the shape and size of the tightening outer peripheral surface of the screwing member, and having a through hole communicating with the fitting hole. The introduction part is integrally formed,
The inner peripheral surface of the through hole is formed so as to be non-contact with the bolt shaft portion protruding from the screwed nut when the screwing member is a nut.
The protrusion is provided so as to be crushed by a load of a tightening torque exceeding a predetermined tightening torque on the outer peripheral surface of the tightening fitted in the fitting hole so that the entire protrusion idles with respect to the screwing member. and along with that,
A tightening torque management tool, characterized in that a holding surface of the protrusion is provided so as to press and hold the vicinity of the center of each of the side portions of the tightening outer peripheral surface of the screw member . It has a fitting hole that is fitted on the outer peripheral surface of the tightening member that is composed of the sides and corners of the screwing member, and a plurality of protrusions are provided inside the fitting hole. A fitting part that abuts and holds the outer peripheral surface of the tightening,
Tightening torque having an outer peripheral surface having the same shape and substantially the same size as the shape and size of the tightening outer peripheral surface of the screwing member, and having a through hole communicating with the fitting hole. The introduction part is integrally formed,
The inner peripheral surface of the through hole is formed so as to be non-contact with the bolt shaft portion protruding from the screwed nut when the screwing member is a nut.
The protrusion is provided so as to be crushed by a load of a tightening torque exceeding a predetermined tightening torque on the outer peripheral surface of the tightening fitted in the fitting hole so that the entire protrusion idles with respect to the screwing member. At the same time
The holding surface of the protrusion is provided so as to engage with and hold the corner portion of the tightening outer peripheral surface of the screwing member and the side portions on both sides thereof. Tightening torque management tool. The protrusion is provided so as to extend in the fitting direction of the screwing member.
The tightening torque management tool according to claim 1 or 2, wherein the holding surface of the protrusion is provided so as to be inclined so as to gradually project inward toward the inner side of the fitting hole. The fitting hole of the tightening torque control tool according to any one of claims 1 to 3 is fitted onto the outer peripheral surface of the nut to be tightened, and the tightening torque control tool and the nut are integrally provided. A nut with a tightening torque control tool. The fitting hole of the tightening torque control tool according to any one of claims 1 to 3 is fitted onto the outer peripheral surface of the tightening head of the bolt, and the tightening torque control tool and the bolt are integrally provided. A bolt with a tightening torque control tool, which is characterized by being used. A method of attaching an attachment using the tightening torque control tool according to any one of claims 1 to 3 .
A nut fitted in the fitting hole of the tightening torque control tool and held in contact with the protrusion is screwed into a bolt shaft portion protruding from the attachment, and the tightening torque introduction portion is rotated and tightened. At the same time, the first step of projecting the bolt shaft portion into the through hole, and
A second step of applying a tightening torque exceeding a predetermined tightening torque to crush the protrusions at the corners of the tightening outer peripheral surface of the nut and idling the tightening torque management tool.
A method for attaching an attachment, which comprises a third step of removing the tightening torque control tool from the nut and the bolt shaft portion.

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