JP2018204624A - Fastening torque management tool, and combination of fastening torque management tool and fastening tool - Google Patents

Abstract

To provide a fastening torque management tool (2) capable of sufficiently increasing fastening torque though it can be comparatively inexpensively manufactured from a synthetic resin, and sufficiently preventing a fastening tool (hexagonal nut 30) from being housed in a storage hole (8) by positioning each angular portion of a regular polygonal outer peripheral face (32) of the fastening tool (hexagonal nut 30) in each recessed portion (16) of the storage hole (8) by storing the fastening tool (hexagonal nut 30) in the storage hole (8) of the fastening tool storage portion (4) as required, that is, without storing the regular polygonal outer peripheral face of the fastening tool while aligned to a virtual regular polygonal inner peripheral face of the storage hole (8).SOLUTION: A regular polygonal shape defined by a straight line (17) connecting adjacent opening ends (17a, 17b) of adjacent recessed portions (16) in a storage hole (8) is determined to be larger than a torque application regular polygonal outer peripheral face of a fastening tool (hexagonal nut 30). Or a blocking projection (29) for blocking intrusion of the fastening tool (hexagonal nut 30) is disposed on at least one of the recessed portions (16) existing on an inner peripheral face of the storage hole (8).SELECTED DRAWING: Figure 5

Description

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

  For example, in the installation of sound insulation walls on highways, the installation of ceiling walls such as tunnels, or the installation of various parts in various buildings, many bolts and nuts are used as is well known. In such fastening, it is important to fasten a nut (usually a locking nut) to the bolt with a relatively large required torque, for example, about 17 to 24 Nm in the case of a hex nut of the nominal system M10. It is. Patent Documents 1 and 2 below disclose a tightening torque management tool that can be used when a nut is tightened with respect to a bolt or a bolt is tightened with a required torque. Such a tightening torque management tool includes a fastener housing portion and a tightening torque adding portion that are integrally connected by a connecting portion that is broken by a required torque. The nut or bolt head is stored in the fastener storage portion, and torque is applied to the tightening torque adding portion to tighten the nut to the bolt or the bolt to the nut. When the tightening torque applied to the nut or bolt via the fastening portion storage portion applied to the tightening torque addition portion exceeds a threshold value, the connection portion is broken and the tightening torque addition portion is separated from the fastener storage portion, Thus, the nut is tightened to the bolt or the bolt to the nut with the required torque.

Japanese Patent Laid-Open No. 2001-140832 JP, 2015-224781, A

  Thus, the tightening torque management tools disclosed in Patent Documents 1 and 2 need to be formed entirely of a strong metal such as iron, particularly when a relatively large tightening torque is required. Therefore, there is a problem to be solved that the manufacturing cost is high. If it is formed from an appropriate synthetic resin to reduce the manufacturing cost, the connecting portion connecting the fastener storage portion and the tightening torque adding portion is less when the tightening torque applied to the tightening torque adding portion is small. It will be broken.

  In order to solve the above-described problem in the tightening torque management tool disclosed in Patent Documents 1 and 2, the present inventors previously described the conventional form in the specification of Japanese Patent Application No. 2016-139152. Proposed an entirely different and unique form of tightening torque management tool. Such a tightening torque management tool includes a fastener housing portion and a tightening torque adding portion integrally formed from synthetic resin. The fastener storage part is formed with a storage hole with an open free end, and this storage hole is the middle of each side of the regular polygon inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is the form which formed the recessed part in the part. Both side surfaces of the recess, that is, an upstream surface located on the upstream side in the fastening rotation direction and a downstream surface located on the downstream side, extend perpendicular to the side surface. When the tightening torque that is applied to the tightening torque adding portion and transmitted to the fastener via the fastener housing portion exceeds a threshold value, the inner peripheral surface of the housing hole is deformed, and the fastener housing portion is As a result, the fastening torque of the fastener is controlled.

  The tightening torque management tool proposed by the present inventors as described above is a tightening torque that starts deformation of the inner peripheral surface of the housing hole even if it is formed from an appropriate synthetic resin such as polycarbonate and acrylonitrile butadiene styrene. Can be set to a sufficiently high value, and therefore it is possible to reduce the manufacturing cost by forming it from an appropriate synthetic resin.

  However, according to the experience of the present inventors, it has been found that the tightening torque management tool as described above by the present inventors is not yet fully satisfactory and has the following problems. did. That is, the fastener is stored in the storage hole of the fastener storage portion as required, that is, each corner portion on the regular polygon outer peripheral surface of the fastener is stored in alignment with each corner portion on the regular polygon inner peripheral surface of the storage hole. However, the corners of the outer periphery of the regular polygon of the fastener are positioned in the recesses of the storage portion, and the fastener is accidentally stored in the storage hole. There is a possibility that the threshold value of the torque at which the peripheral surface is deformed and the fastener receiving portion rotates idly with respect to the fastener will be different from the intended threshold value.

  The present invention has been made in view of the above-mentioned facts, and its main technical problem is to further improve the tightening torque management tool as previously described by the present inventors and the like, and to provide a fastener storage portion. The fastener is securely stored in the storage hole as required, that is, each corner of the regular polygon outer peripheral surface of the fastener is aligned with each corner of the virtual regular polygon inner peripheral surface of the storage hole, and securely stored. In addition, the corners on the outer periphery of the regular polygon of the fastener are positioned in the recesses of the storage hole, and the fastener is sufficiently prevented from being erroneously stored in the storage hole. And providing a new and improved combination of such tightening torque management tool and fastener.

  As a result of intensive studies and experiments, the inventors have made the regular polygon defined by the straight line connecting the adjacent open ends of adjacent recesses in the storage hole larger than the torque-added regular polygon outer peripheral surface of the fastener. It has been found that the above-mentioned main technical problem can be achieved by arranging a blocking projection for blocking the fastener from entering at least one of the recesses present on the inner peripheral surface of the storage hole.

That is, according to the first aspect of the present invention, the tightening torque management tool for achieving the main technical problem includes a fastener storage portion and a tightening torque adding portion integrally formed from synthetic resin,
The fastener storage portion is formed with a storage hole having an open free end, and the inner peripheral surface of the storage hole is a regular polygonal inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is a form in which a recess is formed in the middle part of each side surface,
The regular polygon defined by the straight line connecting the adjacent open ends of the adjacent recesses in the storage hole is larger than the torque-added regular polygon outer peripheral surface of the fastener,
When the tightening torque applied to the tightening torque adding portion and transmitted to the fastener via the fastener storage portion exceeds a threshold value, the inner peripheral surface of the storage hole is deformed and the fastening to the fastener is performed. The tool storage part is idled, and thus the tightening torque of the fastener is managed.
A tightening torque management tool is provided.

According to the second aspect of the present invention, as a tightening torque management tool for achieving the main technical problem, including a fastener storage portion and a tightening torque adding portion integrally formed from synthetic resin,
The fastener storage portion is formed with a storage hole having an open free end, and the inner peripheral surface of the storage hole is a regular polygonal inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is a form in which a recess is formed in the middle part of each side surface,
At least one of the recesses is provided with a blocking protrusion for blocking the fastener from entering,
When the tightening torque applied to the tightening torque adding portion and transmitted to the fastener via the fastener storage portion exceeds a threshold value, the inner peripheral surface of the storage hole is deformed and the fastening to the fastener is performed. The tool storage part is idled, and thus the tightening torque of the fastener is managed.
A tightening torque management tool is provided.

  The blocking protrusion preferably protrudes from the bottom surface of the recess. Conveniently, the torque-added polygonal outer peripheral surface is a regular hexagon. Preferably, the outer peripheral surface of the tightening torque adding portion is a regular polygon corresponding to the torque adding regular polygon outer peripheral surface of the fastener.

  According to the third aspect of the present invention, the tightening torque as described above provided in the first aspect of the present invention is a combination of a tightening torque management tool and a fastener that achieves the main technical problem. A combination of a management tool and a fastener at least partially housed in the storage hole of the tightening torque management tool is provided.

  The regular polygon inner peripheral surface defined by the side surface of the storage hole of the tightening torque management tool is smaller than the torque-added regular polygon of the fastener, and the fastener is press-fitted into the storage hole. Is preferred. The fastener may be a hex nut.

  In the tightening torque management tool provided by the first aspect of the present invention, the regular polygon defined by the straight line connecting the adjacent open ends of the adjacent recesses in the storage hole is more than the torque-added regular polygon of the fastener. Therefore, the fastener is securely stored in the storage hole of the fastener storage portion as required, that is, each corner portion on the outer periphery of the regular polygon of the fastener is each corner portion on the inner surface of the virtual regular polygon of the storage hole. If the corners on the outer periphery of the regular polygon of the fastener are positioned in the recesses of the storage hole without being aligned and stored in the storage hole, On the other hand, the fastener is stored with so-called play, and it is inevitably recognized that the fastener is not properly aligned with the storage hole. Further, in the tightening torque management tool provided by the second aspect of the present invention, the corner portion of the regular polygonal outer peripheral surface of the fastener enters the recess by the blocking protrusion formed on at least one of the recess. Thus, the fastener is securely stored in the storage hole of the fastener storage portion as required, that is, each corner of the regular polygon outer peripheral surface of the fastener is on the virtual regular polygon inner peripheral surface of the storage hole. The corners on the outer periphery of the regular polygon of the fastener are reliably prevented from being erroneously positioned in the recesses of the storage holes without being aligned and stored in the corners. According to the tightening torque management tool of the invention and the combination of the tightening torque management tool and the fastener, the main technical problem is solved.

The slope view which looked at suitable embodiment of the tightening torque management tool comprised according to this invention from the upper direction. The slope view which looked at the clamping torque management tool shown in FIG. 1 from the downward direction. The front view which shows a part of cross-section of the clamping torque management tool shown in FIG. The top view of the clamping torque management tool shown in FIG. The bottom view of the tightening torque management tool shown in FIG. The front view which shows a part of combination of the tightening torque management tool and the nut which is a typical example of a fastener shown in FIG. Sectional drawing of the combination shown in FIG. FIG. 7 is a cross-sectional view illustrating a state in which the tightening torque of the nut exceeds the threshold value and the tightening torque management tool idles with respect to the nut in the combination illustrated in FIG. 6.

  Hereinafter, a preferred embodiment of a tightening torque management tool constructed according to the present invention and a combination of such embodiment and a nut as a typical example of a fastening tool will be described in further detail.

  Referring to FIGS. 1 to 3, the tightening torque management tool generally designated by reference numeral 2 is an appropriate synthetic resin, preferably a relatively high strength synthetic resin such as polycarbonate or acrylonitrile butadiene styrene (ABS), Are integrally formed by injection molding or compression molding. The tightening torque management tool 2 includes a fastener storage portion 4 constituting the substantially lower half portion and a tightening torque adding portion 6 constituting the substantially upper half portion.

  4 and 5 together with FIGS. 1 to 3, the fastener storage portion 4 has a tubular shape as a whole, and a free end portion, that is, a storage hole 8 whose lower end is opened is formed. . The annular lower surface 10 of the fastener storage 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 storage part 4 is cylindrical.

  The inner peripheral surface of the storage hole 8 has a configuration in which a recess 16 is formed in the middle of each side surface 15 of the virtual regular polygon inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener to be stored. is important. In the illustrated embodiment, as will be described later, the fastener is a hexagon nut, and therefore the torque-added regular polygon outer peripheral surface of the fastener is a regular hexagon, and is a virtual regular polyhedral that is a part of the inner peripheral surface of the storage hole 8. The rectangular inner peripheral surface (the inner peripheral surface indicated by a two-dot chain line in FIG. 5) is also a regular hexagon. Each of the recesses 16 has both a bottom surface 16a and both side surfaces, that is, an upstream surface 16b positioned on the upstream side in the tightening rotation direction (clockwise in FIG. 4 and counterclockwise in FIG. 5) and a downstream surface 16c positioned on the downstream side. Have The angle α formed by the bottom surface 16a and the upstream surface 16b is preferably an obtuse angle that is preferably about 100 to 160 degrees. In the illustrated embodiment, the bottom surface 16 a has an arc shape that forms a part of a circle concentric with the outer peripheral surface 14, and the upstream surface 16 b is inclined outward in the tightening rotation direction with respect to the side surface 15. Inclined and extended. It is preferable that the bottom surface 16a and the upstream surface 16b are smoothly connected via an arcuate boundary surface 16d. On the other hand, the downstream surface 16c extends perpendicular to the side surface. In the tightening rotation direction, the circumferential length L1 of the side surface downstream of the recess 16 is advantageously longer than the circumferential length L2 of the side surface upstream of the recess 16 (in this case, As will be clearly understood from the following description, the threshold value of the tightening torque is defined by the deformation of the side surface on the downstream side of the recess 16). As understood by referring to FIG. 3, the lower end portion of the inner peripheral surface of the storage hole 8 opened in the annular lower surface 10 of the fastener storage portion 4 is chamfered. In the illustrated embodiment, the fastener storage portion 4 is also formed with a communication hole 18 continuing from the upper end of the storage hole 8. As clearly understood by referring to FIG. 5, the cross-sectional shape of the communication hole 18 is circular, and its diameter is somewhat smaller than the diameter of the circle inscribed in the virtual regular hexagon in the storage hole 8. An annular shoulder surface 20 facing downward is defined at the boundary between the hole 8 and the communication hole 18.

  In the tightening torque management tool 2 configured according to the present invention, it is important that the storage hole 8 satisfies the following conditions. That is, a virtual regular polygon defined by a straight line 17 connecting adjacent open ends 17a and 17b of adjacent recesses 16 in the storage hole 8, a regular hexagon in the illustrated case, is a torque-added regular polygon outer peripheral surface of a fastener. It is important to be larger than. As will be described later, the fastener needs to be press-fitted into the storage hole 8 and held. Therefore, the virtual regular hexagonal inner peripheral surface defined by each side surface 15 of the storage hole 8 is slightly smaller than the torque-added regular hexagonal outer peripheral surface of the fastener, but the virtual regular hexagon defined by connecting the straight lines 17. The square is preferably somewhat larger than the torque-added regular hexagonal outer peripheral surface of the fastener.

  The description continues with reference to FIG. 1 to FIG. 4. The tightening torque adding portion 6 extending upward from the annular upper surface 12 of the fastener storage portion 4 is also generally cylindrical and has a through hole extending in the vertical direction. 22. As clearly understood from FIG. 3, the through hole 22 communicates with the storage hole 8 through the communication hole 18. The cross-sectional shape of the through hole 22 is circular, and its diameter is smaller than the diameter of the communication hole 18. An annular shoulder surface 24 facing downward is defined at the boundary between the through hole 22 and the communication hole 18. ing. It is preferable that the outer peripheral surface 26 and the upper surface 28 of the tightening torque adding portion 6 have shapes and dimensions corresponding to the outer peripheral surface and the upper surface of the fastener stored in the fastener storage portion 4, and the illustrated embodiment. , The outer peripheral surface 26 of the tightening torque adding portion 6 is a regular hexagonal shape corresponding to the outer peripheral surface of the hexagon nut (the outer diameter of the tightening torque adding portion 6 is smaller than the outer diameter of the fastener housing portion 4). The main portion of the upper surface 28 is flat, but the outer peripheral portion of the corner is chamfered. The diameter of the through hole 22 of the tightening torque adding portion 6 is somewhat larger than the outer diameter of the shaft portion of the bolt to which the hexagon nut is fastened. As will be further described later, the hexagon nut accommodated in the fastener accommodating portion 4 is When the bolt is fastened, the shaft portion of the bolt passes through the communication hole 18 of the fastener storage portion 4 and the through hole 22 of the tightening torque adding portion 6 as the fastening proceeds.

  Although the tightening torque management tool 2 as described above can be circulated on the market by itself, FIGS. 6 and 7 (in FIG. 7, a chamfer at the lower end of the inner peripheral surface of the storage hole 8 is shown for simplification of the drawing. As shown in FIG. 3), it is convenient to distribute it in the market in combination with a fastener. In the embodiment shown in FIGS. 6 and 7, a hex nut 30 is shown as a typical example of a fastener. The outer peripheral surface 32 of the hexagon nut 30 is a regular hexagon and is slightly larger than the virtual regular hexagon related to the storage hole 8 formed in the fastener storage portion 4 (in other words, the fastener in the tightening torque management tool 2). The virtual regular hexagon of the storage hole 8 of the storage unit 4 is set smaller than the outer peripheral surface 32 which is a regular hexagon of the hexagon nut 30). The main portion of the hex nut 30, that is, the portion other than the lower end, is press-fitted into the storage hole 8 of the fastener storage portion 4, and the cylindrical protrusion formed inside the upper peripheral edge 34 of the hex nut 30. The upper surface of 36 is brought into contact with the annular shoulder surface 24 (in the case where the hexagon nut 30 accommodated in the accommodation hole 8 of the fastener accommodating portion 4 does not have the cylindrical protrusion 36, the hexagon nut 30 The upper outer peripheral edge 34 is brought into contact with the annular shoulder surface 20).

  When the hexagon nut 30 is press-fitted into the storage hole 8 formed in the fastening portion storage section 4, each corner portion on the regular hexagonal outer peripheral surface of the hexagon nut 30 is accidentally inserted into each recess 16 formed in the storage hole 8. When the hex nut 30 is positioned, the virtual regular hexagon defined by the straight line 17 connecting the adjacent open ends 17a and 17b of the adjacent recesses 16 in the storage hole 8 is the torque-added regular hexagonal outer peripheral surface of the hex nut 30, as described above. Therefore, the hexagon nut 30 is stored in the storage hole 8 with so-called play, and the operator can appropriately position the hexagon nut 30 with respect to the storage hole 8. You will inevitably recognize that it has been stored.

  When the hexagon nut 30 is press-fitted into the storage hole 8 formed in the fastener storage portion 4, each corner portion on the regular hexagonal outer peripheral surface of the hexagon nut 30 is accidentally inserted into each recess 16 formed in the storage hole 8. To prevent the hexagonal nut 30 from adding a virtual regular hexagon defined by the straight line 17 connecting the adjacent open ends 17a and 17b of the adjacent recesses 16 in the storage hole 8, In addition to or in place of setting it somewhat larger, a blocking projection 29 may be formed in at least one of the recesses 16 as shown by a two-dot chain line in FIG. The blocking protrusion 29 may have an appropriate shape that can prevent the corner portion of the regular hexagonal outer peripheral surface of the hexagon nut 30 from entering the recess 16, for example, may protrude from the bottom surface 16 a of the recess 16.

  The usage mode of the tightening torque management tool 2 as described above will be described. When the hexagon nut 30 is already combined with the tightening torque management tool 2, the shaft portion 38 of the bolt to be tightened. (FIG. 6). When the hexagon nut 30 is not combined with the tightening torque management tool 2, the hexagon nut 30 temporarily fastened to the bolt is stored in the storage hole 8 formed in the fastener storage portion 4 of the tightening torque management tool 2. (In this case, the virtual regular hexagon of the storage hole 8 is set to be substantially the same size as or slightly larger than the regular hexagonal outer peripheral surface of the hexagon nut 30, and the hexagon nut 30 can be easily inserted into the storage hole 8. It is desirable to be able to store it). Next, an appropriate fastening tool (not shown) is engaged with the outer peripheral surface of the fastening torque applying portion 6 and rotated in the fastening direction (clockwise in FIG. 4 and counterclockwise in FIG. 5). Torque applied from the fastener to the tightening torque adding portion 6 is transmitted to the hexagon nut 30 via the fastener storage portion 4, whereby the hexagon nut 30 is tightened to the shaft portion 38 of the bolt. When the hexagonal nut 30 advances over a relatively long distance in the axial direction with respect to the bolt shaft portion 38, the bolt shaft portion 38 is fastened as shown in FIG. The communication hole 18 formed in the storage part 4 and the through hole 22 formed in the tightening torque adding part 6 are entered, and the communication hole 18 and the through hole 22 are inserted.

  When the tightening torque transmitted to the hexagon nut 30 exceeds a predetermined threshold, FIG. 8 (FIG. 8 also shows chamfering at the lower end of the inner peripheral surface of the storage hole 8 for the sake of simplification of the drawing, as in FIG. As shown in the drawing, the inner peripheral surface of the storage hole 8 formed in the fastener storage portion 4, particularly a portion downstream of the recess 16 when viewed in the tightening rotation direction (more specifically, tightening). The portion between the boundary region between the upstream side surface 15 and the downstream side surface 15 and the concave portion 16 of the upstream side surface 15 as viewed in the rotation direction is directed to the opposite side to the tightening rotation direction. As a result, the tightening torque management tool 2 is idled with respect to the hexagon nut 30, and thus the hexagon nut 30 is fastened to the bolt with the required tightening torque. When the tightening torque management tool 2 starts to idle with respect to the hex nut 30, the upstream surface 16 b of the recess 16 of the storage hole 8 in which the outer peripheral surface corner of the hex nut 30 is formed in the fastener storage part 4. However, in the tightening torque management tool 2 constructed according to the present invention, the bottom surface 16a of the recess 16 and the upstream surface 16b form an obtuse angle. Therefore, it is possible to avoid as much as possible that the force applied to the upstream surface 16b of the recess 16 is buffered or disappeared as appropriate, and that the fastener storage portion 4 is cracked and the fastener storage portion 4 is damaged. After the tightening torque management tool 2 starts to idle relative to the hex nut 30, the tightening torque management tool 2 is sufficiently easily detached from the hex nut 30 by being fastened to the bolt shaft 38 with the required tightening torque. be able to.

2: Tightening torque management tool 4: Fastener storage portion 6: Tightening torque addition portion 8: Storage hole 15: Side surface 16: Recess 16a: Bottom surface of the recess 16b: Upstream surface of the recess 16c: Downstream surface of the recess 18: Communication hole 22: Through hole 29: Blocking protrusion 30: Hex nut 38: Bolt shaft

Claims (8)

Including a fastener storage portion integrally formed from a synthetic resin and a tightening torque adding portion;
The fastener storage portion is formed with a storage hole having an open free end, and the inner peripheral surface of the storage hole is a regular polygonal inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is a form in which a recess is formed in the middle part of each side surface,
The regular polygon defined by the straight line connecting the adjacent open ends of the adjacent recesses in the storage hole is larger than the torque-added regular polygon outer peripheral surface of the fastener,
When the tightening torque applied to the tightening torque adding portion and transmitted to the fastener via the fastener storage portion exceeds a threshold value, the inner peripheral surface of the storage hole is deformed and the fastening to the fastener is performed. The tool storage part is idled, and thus the tightening torque of the fastener is managed.
A tightening torque management tool characterized by that. Including a fastener storage portion integrally formed from a synthetic resin and a tightening torque adding portion;
The fastener storage portion is formed with a storage hole having an open free end, and the inner peripheral surface of the storage hole is a regular polygonal inner peripheral surface corresponding to the torque-added regular polygon outer peripheral surface of the fastener. It is a form in which a recess is formed in the middle part of each side surface,
At least one of the recesses is provided with a blocking protrusion for blocking the fastener from entering,
When the tightening torque applied to the tightening torque adding portion and transmitted to the fastener via the fastener storage portion exceeds a threshold value, the inner peripheral surface of the storage hole is deformed and the fastening to the fastener is performed. The tool storage part is idled, and thus the tightening torque of the fastener is managed.
A tightening torque management tool characterized by that.   The tightening torque management tool according to claim 2, wherein the blocking protrusion protrudes from the bottom surface of the recess.   The tightening torque management tool according to any one of claims 1 to 3, wherein the torque-added polygonal outer peripheral surface is a regular hexagon.   The fastening torque management tool according to any one of claims 1 to 4, wherein an outer peripheral surface of the tightening torque adding portion is a regular polygon corresponding to a torque adding regular polygon outer peripheral surface of the fastener.   A combination of the tightening torque management tool according to any one of claims 1 to 5 and a fastener stored at least partially in the storage hole of the tightening torque management tool.   The regular polygon inner peripheral surface defined by the side surface of the storage hole of the tightening torque management tool is smaller than the torque-added regular polygon outer peripheral surface of the fastener, and the fastener is press-fitted into the storage hole. The combination according to claim 6.   8. A combination according to claim 6 or 7, wherein the fastener is a hex nut.