TWI752227B - Tightening torque control tool, and combination of tightening torque control tool and fastening tool - Google Patents

Abstract

A tightening torque control tool (2) includes a fastening tool housing section (4) and a tightening torque applying section (6) integrally formed from a synthetic resin. In the fastening tool housing section (4), a housing hole (8) having a free open end is formed. The housing hole (8) has a regular polygon inner peripheral surface to correspond to a torque applying regular polygon outer peripheral surface of a fastening tool, and a recess (16) is formed on the middle part of each of side faces (15) constituting the regular polygon inner peripheral surface. A bottom surface (16a) of the recess (16) and an upstream surface (16b) positioned upstream when viewed in the fastening rotation direction form an obtuse. A part (15b) of the side face (15) is positioned upstream the recess (16) when viewed in the fastening rotation direction, and on the part (15b), for example a holding projection constituted of a rib (21) extending in the axial direction of the housing hole (8) is arranged.

Description

Tightening torque management tool and combination of tightening torque management tool and fastener

The present invention relates to a locking torque management tool and a combination of the locking torque management tool and a fastener for locking a fastener such as a nut or a bolt with a required torque.

For example, in the installation of sound insulation walls in expressways, the installation of roof walls of tunnels, etc., or the installation of various parts in various structures, as well known, bolts and nuts are often used for fastening. Moreover, in such tightening, it is important to tighten the nut (usually a lock nut) to the bolt system with a large required torque, such as 17 to 17 in the case of a hexagonal nut with a nominal diameter of M10. 24Nm or so. The following Patent Documents 1 and 2 disclose a tightening torque management tool that can be used when tightening a nut to a bolt or a bolt to a nut with a required torque. The locking torque management tool includes a fastener receiving portion and a locking torque applying portion integrally connected by a connecting portion that breaks under a required torque. The nut or the head of the bolt is accommodated in the fastener accommodating portion, and torque is applied to the tightening torque applying portion to lock the nut to the bolt or the bolt to the nut. When the tightening torque applied to the tightening torque applying portion and applied to the nut or the bolt through the tightening portion receiving portion exceeds a threshold value, the connecting portion is broken and the tightening torque applying portion is separated from the tightening portion receiving portion, thereby , with the required torque to lock the nut to the bolt or the bolt to the nut.

[Prior Art Literature]

[Patent Documents]

Patent Document 1: Japanese Patent Laid-Open No. 2001-140832

Patent Document 2: Japanese Patent Laid-Open No. 2015-224781

Furthermore, the locking torque management tools disclosed in the above-mentioned Patent Documents 1 and 2 have the following problems to be solved, especially when a large locking torque is required. Manufacturing costs are high. If it is formed of a suitable synthetic resin in order to reduce the manufacturing cost, the connecting portion connecting the fastener accommodating portion and the tightening torque applying portion is broken when the tightening torque applied to the tightening torque applying portion is small. .

In order to solve the above-mentioned problems in the locking torque management tools disclosed in the above-mentioned Patent Documents 1 and 2, the inventors of the present application have proposed a method completely different from the conventional one in the specification of Japanese Patent Application No. 2016-139152. A unique form of locking torque management tool. This locking torque management tool includes a fastener accommodating portion and a locking torque applying portion integrally formed of synthetic resin. The fastener accommodating portion is formed with an accommodating hole whose free end is an opening, and the accommodating hole is in the form of a recess formed in the middle portion of each side surface of the regular polygon inner peripheral surface corresponding to the torque application regular polygon outer peripheral surface of the fastener . Both side surfaces of the concave portion, ie, the upstream surface located on the upstream side and the downstream surface located on the downstream side as viewed in the locking rotation direction, extend perpendicularly with respect to the side surfaces. When applied to the tightening torque applying portion and transmitted via the fastener receiving portion When the tightening torque of the fastener exceeds the threshold value, the inner peripheral surface of the receiving hole is deformed, and the fastener receiving portion idly rotates with respect to the fastener, thereby managing the tightening torque of the fastener.

Even if the above-mentioned locking torque management tool proposed by the inventors of the present application is formed of a suitable synthetic resin such as polycarbonate and acrylonitrile-butadiene-styrene copolymer, the opening of the inner peripheral surface of the receiving hole can be The deformed locking torque is of a sufficiently high value that it can be formed from a suitable synthetic resin, thereby reducing the manufacturing cost.

However, based on the experience of the inventors of the present application, it is known that the locking torque management tool proposed by the inventors of the present application as described above is not sufficiently satisfactory, and has the following problems. That is, when the inner peripheral surface of the receiving hole of the fastener receiving portion is deformed and the tightening torque management tool is idling relative to the fastener, the corners of the fastener strongly collide with each of the recesses formed by the inner peripheral surface of the receiving hole. For the upstream surface, there is a possibility that cracks will occur from the boundary between the bottom surface of the recessed portion and the upstream surface to the outer peripheral surface of the fastener housing portion, and the fragments may be scattered as dust. This is especially evident in the case of locking using a power tool such as an electric torque driver.

Furthermore, based on the experience of the inventors of the present application, it is known that the above-mentioned locking torque management proposed by the inventors of the present application also has the following problems. That is, the locking torque management tool made of synthetic resin can be sufficiently precisely molded by injection molding or compression molding, and the manufacturing tolerance can be sufficiently narrowed. On the other hand, as is well known to those of ordinary skill in the art to which the present invention pertains, common fasteners that are widely sold, ie, common nuts or bolts, have large manufacturing tolerances. Therefore, especially when the head of a nut or a bolt is press-fitted into a receiving hole formed in the fastener receiving portion of the tightening torque management tool, and the tightening torque management tool and the fastener are combined and provided to the market , then: (1) When the head of the nut or bolt is too large relative to the receiving hole, a large force is required to press the head of the nut or bolt into the receiving hole, and a large force is generated in the fastener receiving part. , which results in tightening the nut to the bolt or the bolt to the nut, tighten the torque management tool (2) On the other hand, when the head of the nut or bolt is too small relative to the receiving hole, the head of the nut or bolt will be accommodated to the In the storage hole, but there is no low concern that the head of the nut or bolt may fall off from the storage hole due to vibration during transportation.

The present invention is made in view of the above facts, and its main technical problem to be solved is to further improve the above-mentioned locking torque management tool previously proposed by the inventors of the present application, and to provide a novel and improved locking torque management tool , or a novel and improved combination of the locking torque management tool and the fastener, when the inner peripheral surface of the receiving hole of the fastener receiving portion is deformed and the locking torque management tool is idling relative to the fastener, even if the outer peripheral surface of the fastener is deformed. The corners of the surface strongly collide with the upstream surface of the recesses formed by the inner peripheral surface of the receiving hole, so as to avoid cracks as much as possible.

Another technical problem to be solved by the present invention is to further improve the above-mentioned locking torque management tool previously proposed by the inventors of the present application, and to provide a novel and improved locking torque management tool, or the locking torque management tool with A novel and improved combination of fasteners, while avoiding large manufacturing tolerances of the fasteners as much as possible, causing the fasteners to be received in the receiving holes of the fastener receiving portion with too large or too little force.

As a result of intensive research and experimentation by the inventors of the present application, it was found that the bottom surface and the upstream surface (the side surface located on the upstream side in terms of the locking rotation direction) of each of the recesses formed by the receiving holes of the fastener receiving portion can be used ) to form an obtuse angle to achieve the above-mentioned main technical problems to be solved.

That is, according to the first aspect of the present invention, there is provided a locking torque management tool that achieves the above-mentioned main technical problem to be solved, and is characterized by comprising a fastener accommodating portion and a locking device integrally formed of synthetic resin. torque application part, The fastener accommodating portion is formed with an accommodating hole whose free end is an opening, and the inner peripheral surface of the accommodating hole is in the form of being in the middle of each side surface of the inner peripheral surface of the regular polygon corresponding to the outer peripheral surface of the regular polygon for applying the torque of the fastener and the bottom surface of the concave portion forms an obtuse angle with the upstream surface on the upstream side as viewed in the locking rotation direction, when applied to the locking torque applying portion and transmitted to the tightening torque through the fastener receiving portion When the tightening torque of the fastener exceeds a threshold value, the inner peripheral surface of the receiving hole is deformed and the fastener receiving portion idly rotates relative to the fastener, thereby managing the tightening torque of the fastener.

The upstream surface of the recess preferably extends obliquely to the locking rotation direction outward from the side surface. The bottom surface and the upstream surface of the concave portion are preferably connected smoothly through an arc-shaped boundary surface. This torque is applied to the outer peripheral surface of a regular polygon to fit a regular hexagon. The respective downstream surfaces of the recesses, which are located on the downstream side as viewed in the locking rotation direction, preferably extend perpendicularly with respect to the side surfaces. The outer peripheral surface of the locking torque applying portion is suitably a regular polygon corresponding to the outer peripheral surface of the torque applying regular polygon of the fastener. Viewed from the locking rotation direction, a portion of the side surface of the inner peripheral surface of the regular polygon on the upstream side of the recess is preferably provided with a holding protrusion. The holding protrusion is preferably a rib extending along the axial direction of the receiving hole. The protruding height of the rib is preferably 0.1 to 0.5 mm, and the circumferential width of the rib is preferably 0.1 to 0.5 mm. The cross-sectional shape of the protruding end of the rib is preferably a semicircular shape.

According to the second aspect of the present invention, a combination of the following locking torque management tool and fastener is provided to achieve the above-mentioned main technical problems to be solved: the first aspect of the present invention provides the above-mentioned locking a torque management tool; and a fastener at least partially received in the receiving hole of the locking torque management tool. The inner peripheral surface of the regular polygon defined by the side surface of the receiving hole of the locking torque management tool should be smaller than the outer peripheral surface of the regular polygon for applying torque of the fastener, and the fastener should be pressed into the receiving hole. The fastener can be a hex nut.

Furthermore, as a result of intensive research and experimentation by the inventors of the present application, it was found that among the side surfaces of the regular polygon inner peripheral surface corresponding to the regular polygon inner peripheral surface defining the receiving hole, it is possible to observe the locking rotation direction. A holding protrusion is arranged on a portion on the upstream side of the concave portion, so as to achieve the above-mentioned other technical problems to be solved.

That is, according to the third aspect of the present invention, there is provided a locking torque management tool to achieve the above-mentioned other technical problems to be solved, comprising a fastener accommodating portion and a locking torque applying portion integrally formed of synthetic resin, which It is characterized in that the fastener accommodating part is formed with a accommodating hole whose free end is an opening, and the inner peripheral surface of the accommodating hole is in the following form: each side of the inner peripheral surface of the regular polygon corresponding to the outer peripheral surface of the regular polygon for applying the torque of the fastener The middle part of the surface forms a recess; in terms of the locking rotation direction, the portion of the side surface of the inner peripheral surface of the regular polygon that is located on the upstream side of the recess is provided with a holding protrusion, which when applied to the locking torque When the tightening torque transmitted by the application portion to the fastener via the fastener receiving portion exceeds a threshold value, the inner peripheral surface of the receiving hole is deformed and the fastener receiving portion is idling relative to the fastener, thereby managing the locking of the fastener tight torque.

The holding protrusion is preferably a rib extending along the axial direction of the receiving hole. The protruding height of the rib is 0.1 to 0.5 mm, and the circumferential width of the rib is preferably 0.1 to 0.5 mm. The cross-sectional shape of the protruding end of the rib is preferably semicircular. The outer peripheral surface of the torque-applying regular polygon is preferably a regular hexagon, and the holding protrusion is preferably provided at a portion located on the upstream side of the recess among each of the six side surfaces. The outer peripheral surface of the locking torque applying portion should preferably be a regular polygon corresponding to the outer peripheral surface of the regular polygon for applying the torque of the fastener.

According to the fourth aspect of the present invention, a combination of a locking torque management tool and a fastener is provided to solve the above-mentioned problems to be solved in other technologies, including: the locking torque management tool provided by the third aspect of the present invention; and The fastener is at least partially received in the receiving hole of the locking torque management tool. The fastener should be pressed into the receiving hole. The fastener can be a hex nut.

In the locking torque management tool and the combination of the locking torque management tool and the fastener provided by the first and second aspects of the present invention, the locking torque management tool can be formed of synthetic resin, so it can be manufactured relatively cheaply, but still The tightening torque is sufficiently large, and the bottom surface and the upstream surface form an obtuse angle in each of the recesses formed by the receiving holes provided in the fastener receiving part of the tightening torque management tool, so that the fastener receiving part can be stored in the fastener receiving part. When the inner peripheral surface of the hole is deformed and the tightening torque management tool is idling relative to the fastener, even if the corners of the outer peripheral surface of the fastener strongly collide with the upstream surfaces of the recesses formed by the inner peripheral surface of the receiving hole, as much as possible Avoid cracking.

In the locking torque management tool and the combination of the locking torque management tool and the fastener provided by the third and fourth aspects of the present invention, the locking torque management tool is formed of synthetic resin, so it can be manufactured relatively cheaply, but still The tightening torque can be increased sufficiently. Furthermore, when the fastener is pressed into the receiving hole of the fastener receiving portion, the elastic deformation and/or the elastic deformation of the holding protrusion arranged on the upstream side of the concave portion in the side surface as viewed in the locking rotation direction and/or Plastic deformation, while compensating for the larger manufacturing tolerances of the fasteners, as far as possible to avoid the force required to press in will become too large or too small.

2: Tightening torque management tool

4: Fastener storage part

6: Tightening torque application part

8: Storage hole

10: Ring lower surface

12: annular upper surface

14: Outer peripheral surface

15: side face

15a: Downstream part of the side surface (the part on the downstream side of the side surface)

15b: The upstream part of the edge surface (the part on the upstream side of the edge surface)

16: Recess

16a: Bottom surface of recess

16b: Upstream face of recess

16c: Downstream face of the recess

16d: Arc Boundary Surface

18: Connecting holes

20: annular shoulder surface

21: Ribs (holding protrusions)

22: Through hole

24: circular shoulder surface

26: Peripheral surface

28: Upper surface

30: Hex Nut

32: Outer peripheral surface

34: Upper surface outer peripheral edge

36: Cylindrical protrusion

38: The shaft of the bolt

40: Uplift

42: Ditch

H: protruding height

L1, L2: Circumferential length

W: Circumferential width

Fig. 1 is a perspective view of a preferred embodiment of the locking torque management tool according to the present invention, viewed from above.

[Fig. 2] is a perspective view of the locking torque management tool shown in Fig. 1 viewed from below.

[ Fig. 3 ] is a front view showing a part of the locking torque management tool shown in Fig. 1 in cross section.

[Fig. 4] is a plan view of the locking torque management tool shown in Fig. 1. [Fig.

[Fig. 5] is a bottom view of the locking torque management tool shown in Fig. 1. [Fig.

[ Fig. 6 ] is a front view showing a part of the combination with the nut, which is a typical example of the tightening torque management tool and the fastener shown in Fig. 1, in cross section.

[Fig. 7] is a sectional view of the combination shown in Fig. 6. [Fig.

[ Fig. 8 ] is a cross-sectional view showing a state in which the locking torque of the nut exceeds a threshold value in the combination shown in Fig. 6 and the locking torque management tool is idling with respect to the nut.

[ Fig. 9 ] is a perspective view similar to Fig. 2 showing another embodiment of the locking torque management tool according to the present invention.

[Fig. 10] is a bottom view of the locking torque management tool shown in Fig. 9. [Fig.

[FIG. 11] is a cross-sectional view similar to FIG. 7, which is a typical example of the tightening torque management tool and the fastener shown in FIG. 9, that is, the combination with the nut.

[FIG. 12] is a cross-sectional view similar to FIG. 7 and FIG. 11, showing another embodiment of the locking torque management tool according to the present invention.

[Preferred form for carrying out the invention]

Hereinafter, it will be described in further detail with reference to a suitable embodiment of the locking torque management tool according to the present invention and the accompanying drawings showing the combination of this embodiment and a typical example of a fastener, that is, a nut.

1 to 3, the locking torque management tool, which is indicated by the reference numeral 2 as a whole, is made of a suitable synthetic resin, and is preferably made of polycarbonate or acrylonitrile-butadiene-styrene copolymer. (ABS) is a high-strength synthetic resin that is integrally formed by injection molding or compression molding. The tightening torque management tool 2 includes a fastener accommodating portion 4 formed by a substantially lower half and a tightening torque applying portion 6 formed by a substantially upper half.

Referring to FIGS. 1 to 3 and continuing with reference to FIGS. 4 and 5 , the fastener accommodating portion 4 is cylindrical as a whole, and has a free end, that is, a accommodating hole 8 whose lower end is open. The annular lower surface 10 of the fastener receiving portion 4 is flat, and similarly, the annular upper surface 12 is also flat and extends parallel to the annular lower surface 10 . The outer peripheral surface 14 of the fastener accommodating portion 4 is cylindrical.

The inner peripheral surface of the receiving hole 8 is mainly in the form that recesses 16 are formed in the middle of each side surface 15 of the virtual regular polygon inner peripheral surface corresponding to the torque application regular polygon outer peripheral surface of the accommodated fastener. In the illustrated embodiment, as described later, the fastener is a hexagonal nut, so that the outer peripheral surface of the regular polygon to which the torque is applied to the fastener is a regular hexagon, and the inner peripheral surface of an imaginary regular polygon (shown by a two-dot chain line in FIG. 5 ) The peripheral surface) is also a regular hexagon. Each of the recesses 16 has a bottom surface 16a, and has two side surfaces, that is, an upstream surface 16b located on the upstream side as viewed in the locking rotation direction (clockwise in FIG. 4, counterclockwise in FIG. 5), and The downstream surface 16c below the downstream side. The important point is that the angle α formed by the bottom surface 16a and the upstream surface 16b is a suitable obtuse angle of about 100 to 160 degrees. In the illustrated embodiment, the bottom surface 16a is an arc shape forming a part of a circle concentric with the outer peripheral surface 14, and the upstream surface 16b extends outwardly with respect to the side surface 15 obliquely in the locking rotation direction. The bottom surface 16a and the upstream surface 16b are preferably connected smoothly via the arc-shaped boundary surface 16d. On the other hand, the downstream surface 16c extends perpendicularly with respect to the side surface 15 . Among the above-mentioned locking rotation directions, the circumferential length L1 of the side surface 15 on the downstream side of the recessed portion 16 is preferably longer than that on the upstream side of the recessed portion 16 . (In this case, as will be clearly understood from the following description, the threshold value of the locking torque is determined by the deformation of the side surface on the downstream side of the recess 16). As can be understood with reference to FIG. 3 , the lower end portion of the inner peripheral surface of the receiving hole 8 to which the annular lower surface 10 of the fastener receiving portion 4 is opened is chamfered. In the illustrated embodiment, the fastener accommodating portion 4 is also formed with a communicating hole 18 extending to the upper end of the accommodating hole 8 . As clearly understood with reference to FIG. 5 , the cross-sectional shape of the communication hole 18 is a circle, and its diameter is slightly smaller than the diameter of the circle inscribed in the imaginary regular hexagon in the above-mentioned receiving hole 8 , and the boundary between the receiving hole 8 and the communication hole 18 is A downwardly facing annular shoulder surface 20 is defined.

1 to 4 , the tightening torque applying portion 6 extending upward from the annular upper surface 12 of the fastener accommodating portion 4 is also generally cylindrical in shape, and has a downward extending portion. through hole 22 . As can be clearly understood from FIG. 3 , the through hole 22 communicates with the above-mentioned accommodation hole 8 via the above-mentioned communication hole 18 . The cross-sectional shape of the through hole 22 is circular, and its diameter is smaller than the diameter of the above-mentioned communication hole 18 , and the boundary between the through hole 22 and the communication hole 18 defines a downward annular shoulder surface 24 . The outer peripheral surface 26 and the upper surface 28 of the tightening torque applying portion 6 should preferably have shapes and dimensions corresponding to the outer peripheral surface and upper surface of the fasteners accommodated in the fastener receiving portion 4 . The outer peripheral surface 26 of the tightening torque applying portion 6 is of a regular hexagonal shape corresponding to the outer peripheral surface of the hexagonal nut (so the outer diameter of the tightening torque applying portion 6 is smaller than the outer diameter of the fastener receiving portion 4), and the main surface of the upper surface 28 is in the shape of a regular hexagon. The part is flat, but the outer periphery of the corner is chamfered. The diameter of the through hole 22 of the tightening torque applying portion 6 is slightly larger than the outer diameter of the shaft portion of the bolt to which the hexagonal nut is fastened. When the bolt is reached, the shaft portion of the bolt is inserted into the communication hole 18 of the fastener accommodating portion 4 and the through hole 22 of the tightening torque applying portion 6 in accordance with the progress of tightening.

The above-mentioned locking torque management tool 2 can also be distributed in the market alone, but it is preferable to omit the chamfering in the lower end of the inner peripheral surface of the receiving hole 8 as shown in FIG. 6 and FIG. processing icon) As shown, it is distributed in the market in combination with fasteners. In the embodiment shown in FIGS. 6 and 7 , a hexagonal nut 30 is shown as a typical example of the fastener. The outer peripheral surface 32 of the hexagonal nut 30 is a regular hexagon, and is slightly larger than the aforementioned imaginary regular hexagon in relation to the receiving hole 8 formed in the fastener receiving portion 4 (in other words, the fastener receiving portion 4 in the tightening torque management tool 2 The imaginary regular hexagon of the receiving hole 8 is set smaller than the outer peripheral surface 32 of the regular hexagon of the hexagon nut 30 ). Then, the main part of the hexagonal nut 30, that is, the part other than the lower end, is pressed into the receiving hole 8 of the fastener receiving part 4, and the circle formed by the inner side of the outer peripheral edge part 34 of the upper surface of the hexagonal nut 30 is formed. The upper surface of the cylindrical protrusion 36 is in contact with the above-mentioned annular shoulder surface 24 (in the case where the hexagonal nut 30 accommodated in the receiving hole 8 of the fastener receiving portion 4 does not have the cylindrical protrusion 36, the hexagonal nut The outer peripheral edge portion 34 of the upper surface of 30 is in contact with the aforementioned annular shoulder surface 20).

Explain the usage of the above-mentioned locking torque management tool 2. In the case where the locking torque management tool 2 has been combined with a hexagonal nut 30, the hexagonal nut 30 is connected to the shaft portion 38 of the bolt to be fastened (FIG. 6). ) is fitted. In the case where the hexagonal nut 30 is not combined with the tightening torque management tool 2, the hexagonal nut 30 temporarily tightened by the bolt is accommodated in the receiving hole 8 formed by the fastener accommodating portion 4 of the tightening torque management tool 2 (this In this case, the virtual regular hexagon shape of the storage hole 8 is set to be substantially the same size as or slightly larger than the outer peripheral surface of the regular hexagon shape of the hexagon nut 30, and the hexagon nut 30 can be easily accommodated in the storage hole sufficiently. 8 is better). Next, fit a suitable locking tool (not shown) to the outer peripheral surface of the locking torque applying portion 6 and rotate in the locking rotation direction (clockwise in FIG. 4 , counterclockwise in FIG. 5 ). The torque applied from the fastener to the tightening torque applying portion 6 is transmitted to the hexagonal nut 30 via the fastener receiving portion 4 , and thereby the hexagonal nut 30 is locked to the shaft portion 38 of the bolt. When the hexagonal nut 30 travels over a long distance in the axial direction relative to the shaft portion 38 of the bolt, the shaft portion 38 of the bolt enters the fastener accommodating portion as shown by the two-dot chain line in FIG. 6 . 4. The communication hole 18 formed and the through hole 22 formed by the locking torque applying portion 6 are inserted through the communication hole 18 and the through hole 22.

When the tightening torque transmitted to the hexagon nut 30 exceeds a predetermined threshold value, as shown in FIG. As shown in the figure of processing), the inner peripheral surface of the receiving hole 8 formed in the fastener receiving portion 4 is, in particular, a portion on the downstream side of the recessed portion 16 as viewed in the locking rotation direction (more specifically, In terms of the locking rotation direction, it is tied between the following two parts: the boundary area between the upstream side surface 15 and the downstream side surface 15; and the concave portion 16 of the upstream side surface 15), which is pressed On the other hand, it deforms to the opposite side to the locking rotation direction, and the locking torque management tool 2 rotates idly with respect to the hexagon nut 30 to fasten the hexagon nut 30 to the bolt with the required tightening torque. When the tightening torque management tool 2 starts idling with respect to the hexagon nut 30, the corner portion of the outer peripheral surface of the hexagon nut 30 may collide violently with the upstream surface 16b of the recessed portion 16 of the housing hole 8 formed in the fastener housing portion 4. However, in the locking torque management tool 2 according to the present invention, the bottom surface 16a of the recessed portion 16 and the upstream surface 16b form an obtuse angle, so the force applied from the corner of the outer peripheral surface of the hexagonal nut 30 to the upstream surface 16b of the recessed portion 16 Appropriate buffering and even disappearing, as far as possible to avoid cracks in the fastener storage portion 4 and damage to the fastener storage portion 4 . After the tightening torque management tool 2 starts idling with respect to the hexagonal nut 30, the locking torque management tool 2 can be sufficiently easily disengaged from the hexagonal nut 30 locked to the shaft portion 38 of the bolt with the required tightening torque.

9 and 10 illustrate other suitable embodiments of the locking torque management tool constructed in accordance with the present invention. In the locking torque management tool 2 shown in FIGS. 9 , 10 and 11 , the locking rotation direction (counterclockwise in FIG. 10 ) of the side surface 15 that defines the inner peripheral surface of the receiving hole 8 ) The portion 15b located on the upstream side of the recessed portion 16 in view (ie, the portion 15b on the upstream side of the side surface) is provided with a holding protrusion. In the embodiment shown in the figure, the holding protrusion is formed with a rib 21 extending along the axis direction of the receiving hole 8 (the direction perpendicular to the paper in FIG. 10 ), wherein the rib 21 is preferably aligned with the axis of the receiving hole 8 extend substantially parallel. In the illustrated embodiment, each of the upstream-side portions 15b of the six side surfaces 15 is formed with a rib 21 that is a holding protrusion. Each of the ribs 21 extends substantially parallel to the axis of the receiving hole 8 from the upper end of the receiving hole 8 to the vicinity of the lower end, as clearly understood with reference to FIGS. 9 and 10 . In particular, for fasteners with nominal diameters In the case of M8, M10, or M12, the protruding height H of the rib 21 is preferably about 0.1 to 0.5 mm, and the circumferential width W of each of the ribs 21 is preferably about 0.1 to 0.5 mm. The cross-sectional shape of the protruding end portion of the rib portion 21 is preferably semicircular as shown in FIG. 10 . In the embodiment shown in the figure, the rib 21 is formed on all the upstream side portions 15b of the six side surfaces 15, but if necessary, for example, only three side surfaces 15 arranged at intervals of one, or along the diameter A rib 21 is formed on the upstream side portion 15b of the two side surfaces 15 arranged in the opposite direction.

The rib 21 which constitutes the holding protrusion can be formed not only in the portion 15b of the side face 15 which is located on the upstream side of the recess 16 as viewed in the locking rotation direction, but also in the side face 15 where the lock is formed. The portion 15a located on the downstream side of the concave portion 16 as viewed in the rotational direction (ie, the portion 15a on the downstream side of the side surface). However, also in the case of the portion 15a formed in the side surface 15 on the downstream side of the recessed portion 16 as viewed in the locking rotation direction, as described above, when the locking torque reaches the threshold value, the portion 15a in the side surface 15 is The portion 15a located on the downstream side of the concave portion 16 as viewed in the locking rotation direction is mainly deformed, so the rib portion is deformed throughout the entirety before the deformation of the side surface 15, so that the locking torque management tool 2 will not be locked. The tendency to disengage from a fastener before the torque reaches a threshold. Therefore, it is preferable that the rib 21 is not provided in the portion 15a of the side surface 15 that is located on the downstream side of the recessed portion 16 as viewed in the locking rotation direction.

In the embodiment shown in FIGS. 9 and 10 , the configurations other than the above-mentioned ribs 21 are substantially the same as those of the embodiment described with reference to FIGS. 1 to 8 , and the same components are denoted by the same reference numerals.

Referring to FIGS. 9 and 10 and referring to FIG. 11, the description will continue. The above-mentioned locking torque management tool 2 can also be circulated in the market alone, but as shown in FIG. The illustration of the chamfering process in the lower end of the inner peripheral surface of 8, and the rib 21 is somewhat elastically or even plastically deformed by pressing the fastener, namely the hexagonal nut 30 into the receiving hole 8, but such deformation is not shown. , and the illustrated rib 21 overlaps the hexagonal nut 30 in a state of no deformation, as shown, and is combined with a fastener and circulated in the market. as As described above, the outer peripheral surface 32 of the hexagonal nut 30 as a typical example of the fastener is a regular hexagon, and when the manufacturing error of the hexagonal nut 30 is sufficiently small, it is slightly larger than the receiving hole 8 formed in the fastener receiving portion 4 The above-mentioned virtual regular hexagon (in other words, the virtual regular hexagon of the receiving hole 8 of the fastener accommodating part 4 in the tightening torque management tool 2 is set to be smaller than the regular hexagonal outer peripheral surface 32 of the hexagon nut 30). Then, the main part of the hexagon nut 30, that is, the part other than the lower end, is press-fitted into the receiving hole 8 of the fastener accommodating part 4, so that the inner side of the outer peripheral edge part 34 of the upper surface of the hexagon nut 30 is formed into a cylindrical shape. The upper surface of the protrusion 36 abuts against the annular shoulder surface 24 (please refer to FIG. 6 ). The hexagonal nut 30 is held in the receiving hole 8 by the following: the side surface of the hexagonal nut 30 is press-contacted in the side surface 15 as viewed from the above-mentioned locking rotation direction (counterclockwise in FIG. 11 ). The portion 15a located on the downstream side of the recessed portion 16 is also crimped to the rib portion 21.

As described above, the manufacturing tolerance of the locking torque management tool 2 which is injection-molded or compression-molded from a suitable synthetic resin is small, so that the manufacturing tolerance of the inner peripheral surface of the receiving hole 8 is small. The manufacturing tolerance is large, so the manufacturing error of the outer peripheral surface of the hexagonal nut 30 is large, but in the tightening torque management tool 2 shown in FIG. 9 , FIG. 10 and FIG. The elastic or even plastic deformation of the rib 21 formed in the required portion compensates for the relatively large manufacturing error between the outer peripheral surface of the hexagonal nut 30 and the inner peripheral surface of the receiving hole 8 . Therefore, the force required to press the hexagonal nut 30 into the receiving hole 8 is avoided as much as possible from becoming too large or too small.

In the embodiment shown in FIGS. 9, 10 and 11, the holding protrusion is formed by a rib 21 extending along the axial direction of the receiving hole 8, but if necessary, the holding protrusion can also be formed by the following Portion: a plurality of ribs extending in the axial direction with an interval in the axial direction or the circumferential direction of the receiving hole 8, one rib extending in the circumferential direction of the receiving hole 8, spaced in the axial direction or circumferential direction of the receiving hole 8 and extending along the A plurality of ribs extending in the circumferential direction, or a plurality of protrusions appropriately arranged (the cross-sectional shape is preferably circular). Figure 12 Additional other embodiments of retaining tabs are shown. In this embodiment, the portion 15b of the side surface 15 (please refer to FIG. 9 ), which is located on the upstream side of the recessed portion 16 as viewed from the locking rotation direction (counterclockwise in FIG. 12 ), extends over the surface thereof. The raised portion 40 is formed as a whole, and the groove 42 extending along the raised portion 40 is formed on the back side of the raised portion 40 . In this embodiment, the hexagonal nut 30 is held in the receiving hole 8 by the following method: when viewed from the locking rotation direction (counterclockwise in FIG. 12 ) between the raised portion 40 and the side surface 15 The portion 15a located on the downstream side of the recessed portion 16 is crimped to the side surface of the hexagon nut 30 together. The large manufacturing error of the outer peripheral surface of the hexagonal nut 30 relative to the inner peripheral surface of the receiving hole 8 is compensated by the elastic deformation of the raised portion 40, and the hexagonal nut 30 is avoided as much as possible to be pressed into the receiving hole 8. The power of the whiskers becomes too large or too small.

2: Tightening torque management tool

4: Fastener storage part

6: Tightening torque application part

8: Storage hole

10: Ring lower surface

14: Outer peripheral surface

26: Peripheral surface

Claims (21)

A locking torque management tool, comprising a fastener accommodating portion and a locking torque applying portion integrally formed of synthetic resin, the fastener accommodating portion is formed with a receiving hole whose free end is an opening, and the inner peripheral surface of the receiving hole is below the Form: A recess is formed in the middle of each side surface of the regular polygon inner peripheral surface corresponding to the outer peripheral surface of the regular polygon to which the torque of the fastener is applied; and the recess has a bottom surface, an upstream surface, and a downstream surface, and the upstream surface faces from the side surface toward The outer side extends obliquely to the locking rotation direction, and when the locking torque applied to the locking torque applying portion and transmitted to the fastener through the fastener receiving portion exceeds a threshold value, the inner circumference of the receiving hole is The surface deforms and the fastener receiving portion idles relative to the fastener, thereby managing the tightening torque of the fastener. The locking torque management tool of claim 1, wherein the bottom surface and the upstream surface of the concave portion are smoothly connected through an arc-shaped boundary surface. The locking torque management tool according to claim 1 or 2 of the claimed scope, wherein the outer peripheral surface of the regular polygon for applying torque is a regular hexagon. The locking torque management tool of claim 1 or 2, wherein each of the recesses is located on a downstream surface on the downstream side as viewed in the locking rotation direction, and extends perpendicularly with respect to the side surface. For the tightening torque management tool according to item 1 or 2 of the scope of the application, wherein, The outer peripheral surface of the locking torque applying portion is a regular polygon corresponding to the outer peripheral surface of the torque applying regular polygon of the fastener. According to the locking torque management tool of claim 1 or 2 of the claimed scope, wherein, viewed from the locking rotation direction, the portion of the side surface of the inner peripheral surface of the regular polygon that is located on the upstream side of the concave portion is set. Has retaining tabs. The locking torque management tool of claim 6, wherein the holding protrusion is a rib extending along the axial direction of the receiving hole. The locking torque management tool of claim 7, wherein the protruding height of the rib is 0.1 to 0.5 mm, and the circumferential width of the rib is 0.1 to 0.5 mm. The locking torque management tool of claim 7, wherein the cross-sectional shape of the protruding end of the rib is a semicircle. A combination of a locking torque management tool and a fastener, wherein the locking torque management tool is the locking torque management tool of any one of claims 1 to 9, and the fastener is at least partially accommodated in the Tighten the receiving hole of the torque management tool. The combination of a locking torque management tool and a fastener according to claim 10, wherein the inner peripheral surface of the regular polygon of the locking torque management tool defined by the side surface of the receiving hole is smaller than the torque applied by the fastener The outer peripheral surface of a regular polygon, and the fastener is pressed into the receiving hole. According to the combination of the tightening torque management tool and the fastener according to claim 10 or 11, the fastener is a hexagon nut. A locking torque management tool, comprising a fastener accommodating portion and a locking torque applying portion integrally formed of synthetic resin, the fastener accommodating portion is formed with a receiving hole whose free end is an opening, and the inner peripheral surface of the receiving hole is below the Form: A recess is formed in the middle of each side surface of the inner peripheral surface of the regular polygon corresponding to the outer peripheral surface of the regular polygon to which the torque of the fastener is applied; A portion located on the upstream side of the recessed portion is provided with a holding protrusion, and when the locking torque applied to the locking torque applying portion and transmitted to the fastener via the fastener receiving portion exceeds a threshold value, the inside of the receiving hole The peripheral surface is deformed and the fastener receiving portion idly rotates relative to the fastener, thereby managing the tightening torque of the fastener. The locking torque management tool of claim 13, wherein the holding protrusion is a rib extending along the axial direction of the receiving hole. The locking torque management tool of claim 14, wherein the protruding height of the rib is 0.1 to 0.5 mm, and the circumferential width of the rib is 0.1 to 0.5 mm. The locking torque management tool of claim 14 or 15, wherein the cross-sectional shape of the protruding end of the rib is a semicircle. For the locking torque management tool according to any one of items 13 to 15 of the scope of the application, wherein, The outer peripheral surface of the torque-applying regular polygon is a regular hexagon, and in each of the six side surfaces, the holding protrusion is provided at a portion located on the upstream side of the recess. The locking torque management tool according to any one of claims 13 to 15, wherein the outer peripheral surface of the locking torque applying portion is a regular polygon corresponding to the outer peripheral surface of the torque applying regular polygon of the fastener. A combination of a locking torque management tool and a fastener, characterized in that the locking torque management tool is the locking torque management tool of any one of items 13 to 18 of the scope of the application, and the fastener is at least partially accommodated in the receiving hole of the locking torque management tool. The combination of the locking torque management tool and the fastener as claimed in claim 19, wherein the fastener is pressed into the receiving hole. The combination of the tightening torque management tool and the fastener as claimed in claim 19 or 20 of the patent application scope, wherein the fastener is a hexagon nut.

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