JP2008014469A - Tightening coupling device, tightening coupling method - Google Patents

Abstract

A tightening and coupling device and a tightening and coupling method capable of preventing loosening and disengagement due to mischief.
A body portion 1a of a bolt 1 is passed through holes 6a and 7a formed in tightened coupling members 6 and 7 so that a screw portion 2b formed on an inner peripheral surface of a key nut 2 is The threaded portion 3c is formed on the outer peripheral surface of the key nut 2 so as to have a rougher shape than the male threaded portion 1b of the bolt 1 because the threaded portion is screwed with the male threaded portion 1b formed on the outer peripheral surface. And screwed with the external threaded portion 3c. Next, by rotating the tightening nut 3 in the tightening direction, the key nut 2 is tightened with respect to the bolt 1 and the tightened coupling members 6, 7, and tightened with the key nut 2 and the head 1 c of the bolt 1. The coupling members 6 and 7 are tightened and coupled. Then, by rotating the tightening nut 3 in the loosening direction, the tightening nut 3 is detached from the key nut 2 without loosening the key nut 2 with respect to the bolt 1 and the tightened coupling members 6 and 7.
[Selection] Figure 1B

Description

  The present invention relates to a tightening coupling device and a tightening coupling method for tightening and coupling a tightened coupling member, and more particularly to prevention of mischief after the tightened coupling member is coupled.

  Bolts and nuts are convenient means for tightening and coupling the tightened coupling members, and are widely used in a wide range of fields. However, general bolts and nuts having high versatility can be easily loosened or removed directly using a general versatile tool such as a wrench or spanner. For this reason, the bolts and nuts may be loosened or removed by a third party, resulting in insufficient strength of the coupling part of the tightened coupling member or loss of the tightened coupling member. May suffer. In particular, when the tightened coupling member is an expensive outdoor installation structure such as an aluminum railing or a copper nameplate, the tightened coupling member is frequently carried away.

  Therefore, as a countermeasure for preventing mischief of bolts and nuts, specially shaped bolts that can be tightened or loosened only with special dedicated tools are used. In addition, a Bonacap (registered trademark) or the like that is attached so as to cover the head portion of the bolt after the tightened coupling member is coupled and can be removed only by a special dedicated tool is used. On the other hand, as a measure for preventing loosening of bolts and nuts, as disclosed in Japanese Patent Application Laid-Open No. 2004-151561, a screwed joint member is fastened with two nuts together with the bolts, and the two nuts are screwed together. The thread pitch of the thread part and the male thread part is made smaller than the pitch of the female thread part and male thread part of each nut and bolt that are screwed together to increase the tightening coupling force and make it difficult to loosen. .

  However, the fact that it can be tightened only with a special dedicated tool such as a specially shaped bolt is inconvenient depending on the loss of the tool or other use, and the workability is poor. In addition, the bona cap and the like are expensive due to the large number of parts. Furthermore, in a structure such as Patent Document 1, if a certain amount of force is exerted, it is possible to directly loosen the bolt and nut with a tool such as a wrench or spanner, and it is impossible to prevent mischief.

JP-A-8-247129

  The present invention solves the above-mentioned problems, and an object of the present invention is to provide a tightening and coupling device and a tightening and coupling method that can prevent loosening and disengagement due to mischief.

  The tightening and coupling device according to the present invention is a bolt in which a threaded portion is formed on the outer peripheral surface of a rod-shaped main body portion, a head is formed at one end, and the main body portion passes through a hole formed in a tightened coupling member. And a female threaded portion that can be screwed to the male threaded portion of the bolt on the inner peripheral surface of the cylindrical main body, and a threaded portion and a circular collar portion are formed on the outer peripheral surface. A key nut that tightens and joins the tightened coupling member, and a female thread portion that can be screwed with the male thread portion of the key nut is formed on the inner peripheral surface of the cylindrical main body, and is combined with the key nut to tighten the key nut with the bolt. It is equipped with a special nut that is tightened to the tightened coupling member and removed from the key nut in the tightened coupled state of the to-be-tightened coupling member. From the shape of the male thread of the bolt and the female thread of the key nut, Tightening exclusive nut female thread If the shape is rough.

  Further, in the tightening and coupling method according to the present invention, a screw portion is formed on the outer peripheral surface of the rod-shaped main body portion, and the main body portion of the bolt having a head portion formed at one end is formed on the tightened coupling member. Next, a female threaded portion that can be screwed onto the male threaded portion of the bolt is formed on the inner peripheral surface of the cylindrical main body, and the female threaded portion that is coarser than the threaded threaded portion of the bolt is formed on the outer peripheral surface. Of the key nut in which a circular flange is formed, and the female screw portion can be screwed with the male screw portion of the bolt, and the female screw portion of the key nut can be screwed onto the inner peripheral surface of the cylindrical main body portion. Screw the nut into the key nut's male thread, and then rotate the tightening nut to one side so that the key nut is attached to the bolt and the tightened coupling member. Tighten and tighten the tightened coupling member with the key nut and bolt head to Then, by rotating the clamping nut only to the other, without loosening with respect to the bolt and the coupling member be fastened to Kinatto, remove the clamping nut only from Kinatto.

  If it does as mentioned above, since the collar part is formed with the threaded part on the outer peripheral surface of the key nut, after passing the bolt through the to-be-tightened coupling member and screwing the bolt and each nut, By rotating the nut to one side, the key nut can be securely tightened with respect to the bolt and the to-be-tightened coupling member by pressing the collar portion with the tightening nut. For this reason, it becomes possible to clamp | tighten and fasten a to-be-clamped coupling member with a key nut and the head of a volt | bolt. In addition, the shape of the female threaded part of the key nut and the female threaded part of the tightening nut is rougher than the female threaded part of the bolt and the female threaded part of the key nut. Can do. For this reason, it is possible to rotate the nut exclusively for tightening to the other side and remove it from the key nut without securely loosening the key nut after the tightening coupling member to be tightened. When the nut for exclusive tightening is removed, the key nut cannot be directly gripped and loosened with a general-purpose tool such as a general wrench or spanner, and the bolt and key nut are surely loosened and removed due to mischief by a third party. It becomes possible to prevent. In addition, when using general bolts and nuts with high versatility as bolts and nuts for fastening, hold the bolts and fastening nuts with a general purpose tool such as a general wrench or spanner and fix one. Then, the other can be rotated to tighten the key nut, and the fastened coupling member can be easily tightened and coupled, and the tightening nut can be rotated and removed from the key nut. For this reason, a special dedicated tool is not required, cost can be kept low, and workability can be improved.

  In one embodiment of the present invention, in the above-described tightening and coupling device, the thread of the male screw portion of the key nut and the female screw portion of the exclusive tightening nut is determined from the pitch of the thread of the male screw portion of the bolt and the female screw portion of the key nut. The pitch of the mountain is larger.

  In this way, the shape of the female threaded part of the key nut and the female threaded part of the tightening nut becomes rougher than the female threaded part of the bolt and the female threaded part of the key nut, and the frictional force at the time of screwing is easily reduced. It can be surely easy to loosen.

  In one embodiment of the present invention, in the above-described tightening and coupling device, the cross-sectional shape of the thread of the male screw portion of the bolt and the female screw portion of the key nut is a triangle, and the female screw portion of the key nut and the female nut for exclusive use are tightened. The cross-sectional shape of the thread of the thread portion is a quadrangle.

  In this way, the shape of the female threaded part of the key nut and the female threaded part of the dedicated nut is rougher than the female threaded part of the bolt and the female threaded part of the key nut, and the frictional force during screwing is significantly reduced. It is possible to make it easier to loosen.

  In one embodiment of the present invention, in the above tightening and coupling device, another thread portion different from the thread portion is formed on the outer peripheral surface of the key nut, and another key nut is formed on the inner peripheral surface of the cylindrical main body portion. A female threaded part that can be screwed with the male threaded part is formed, and is equipped with a special nut for loosening that is combined with the keynut to loosen the keynut against the bolt and the tightened coupling member. The direction of winding of the thread of the female thread is opposite to the direction of winding of the female thread of the bolt, the female thread of the nut for exclusive tightening, and the female thread of the key nut and male thread that can be screwed to the thread. It is.

  Furthermore, in one embodiment of the present invention, in the above-described tightening and coupling method, apart from the male screw portion on the outer peripheral surface of the key nut, the winding direction of the male screw portion and the male screw portion of the bolt and the thread is opposite. After the nut for exclusive use is formed and the nut for exclusive use is removed from the key nut, the nut for exclusive use for loosening, in which the internal thread of the key nut and the internal thread part that can be screwed with the other male part is formed, The key nut is loosened with respect to the bolt and the tightened coupling member by screwing the female thread portion with another screw portion of the key nut and then rotating the loosening exclusive nut in one direction.

  As described above, the winding direction of the other threaded part of the key nut and the threaded part of the loosening nut is the same as the threading direction of the other threaded bolt, tightening nut, and keynut threaded part and female threaded part. The direction of the winding is opposite, so screw the screw thread of the special screw for loosening with the other screw part of the key nut and rotate the special screw for loosening to one side. It can be easily and reliably loosened or removed from the coupling member. The key nut can be detachable by tightening or loosening the bolt and the tightening coupling member with the exclusive tightening nut and the loosening nut, and the tightening coupling member can be tightened to be coupled or released. Therefore, the convenience of the tightening and coupling device can be improved.

  According to the present invention, the bolt is passed through the to-be-tightened coupling member, the bolt and each nut are screwed together, and then the key nut is securely tightened through the exclusive nut with a general versatile tool. The tightened coupling member is firmly tightened and coupled with the key nut and bolt, and the key nut can be removed from the nut without securely loosening the key nut in this state. It becomes impossible to directly loosen with a conventional tool, and it is inexpensive and easy to work, and it is possible to reliably prevent loosening and disengagement of the bolt and key nut by a third party mischief.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. For convenience, the same reference numerals are given to substantially the same or corresponding parts in the drawings.

  1A to 1C are views showing a tightening and coupling device 101 according to a first embodiment of the present invention. As shown in FIG. 1A, the tightening and coupling device 101 includes a bolt 1, a key nut 2, and a tightening nut 3. In FIG. 1A, a side view is shown for the bolt 1, a side view is shown on the right side of the center line (dashed line), and a cross-sectional view is shown on the left side for the nuts 2 and 3. The bolt 1 is composed of a general hex bolt having high versatility. A male screw portion 1b is formed on the outer peripheral surface of the rod-shaped main body portion 1a of the bolt 1, and a head portion 1c is formed at one end. The diameter of the head 1c is larger than that of the main body 1a and the external thread 1b. A female screw portion 2b that can be screwed with the male screw portion 1b of the bolt 1 is formed on the inner peripheral surface of the cylindrical main body portion 2a of the key nut 2, and a male screw portion 2c and a flange portion 2d are formed on the outer peripheral surface. Has been. The flange portion 2d is formed at one end of the outer peripheral surface of the key nut 2 so as to protrude in the radial direction of the main body portion 2a, and its outer shape is circular and easy to slide when viewed from the axial direction. It cannot be gripped with a general-purpose wrench or spanner. The fastening nut 3 is a general hex nut with high versatility. A female screw portion 3c that can be screwed with the male screw portion 2c of the key nut 2 is formed on the inner peripheral surface of the cylindrical main body portion 3a of the nut 3 exclusively for fastening. The outer shape of the head 1c of the bolt 1 and the body 3a of the nut 3 for tightening is hexagonal when viewed from the axial direction, so it can be gripped with a general-purpose tool such as a general wrench or spanner (not shown). Can be fixed or rotated about an axis.

  The pitch P2 of the thread of the female thread 2c of the key nut 2 and the female thread 3c of the exclusive nut 3 is larger than the thread pitch P1 of the female thread 1b of the bolt 1 and the female thread 2b of the key nut 2. (P1 <P2). Thereby, the shape of the external thread part 2c and the internal thread part 3c is coarser than the external thread part 1b and the internal thread part 2b, and the frictional force at the time of screwing is small, and it is easy to tighten or loosen. . The screw portions 1b, 2b, 2c, and 3c of the bolt 1 and the nuts 2 and 3 are right-hand screws in which the winding direction of the screw thread is rising to the right, and a triangular screw in which the cross-sectional shape of the screw thread is a triangle. It is.

  The tightening and coupling device 101 is used, for example, as shown in FIGS. 1B and 1C. 5 is a washer, and 6 and 7 are tightened coupling members. The washer 5 and the tightened coupling members 6 and 7 are formed with holes 5a, 6a, and 7a that are large enough to pass through the body 1a of the bolt 1 and not through the head 1c and the nuts 2 and 3 of the bolt 1, respectively. Has been. The main body 1a of the bolt 1 is longer than the sum of the thicknesses of the washer 5, the tightened coupling members 6, 7 and the key nut 2.

  The procedure of tightening and coupling the tightened coupling members 6 and 7 by the tightening coupling device 101 is as follows. First, the main body 1a of the bolt 1 is passed through the washer 5 and the holes 5a, 6a and 7a of the tightened coupling members 6 and 7. Let Next, the female screw portion 2b of the key nut 2 is screwed into the male screw portion 1b of the bolt 1 protruding from the hole 7a from the flange portion 2d side, and the female screw portion 3c of the exclusive nut 3 is connected to the key nut 2 Screwed into the threaded portion 2c. Next, a tool such as a wrench or a spanner is engaged with the tightening nut 3 and the head 1c of the bolt 1, and the tightening nut 3 is tightened in the tightening direction (clockwise) while fixing the head 1c, for example. , The key nut 2 is tightened against the bolt 1 and the tightened coupling members 6 and 7, and the tightened coupling member 6 and the key nut 2 and the head 1c of the bolt 1 are tightened as shown in FIG. 1B. Tighten 7 to join. Specifically, when the exclusive tightening nut 3 rotates in the tightening direction, the tightening coupling members 6 and 7 move forward to be tightened against the key nut 2 and come into contact with the flange portion 2d to contact the flange portion 2d. Is pushed to the tightened coupling members 6 and 7 side. As a result, the key nut 2 rotates in the tightening direction together with the tightening nut 3, advances toward the tightened coupling members 6 and 7, and is tightened against the bolt 1 and the tightened coupling members 6 and 7. 2 and the head 1c of the bolt 1 are fastened and fastened to the fastened coupling members 6 and 7.

  Then, the key nut 2 is tightened with the bolt 1 as shown in FIG. 1C by rotating the exclusive nut 3 in the loosening direction (counterclockwise) while fixing the head 1c of the bolt 1 with a tool such as a wrench or spanner. The tightening nut 3 is removed from the key nut 2 without loosening the attached coupling members 6 and 7. Specifically, since the female screw portion 2c of the key nut 2 and the female screw portion 3c of the exclusive tightening nut 3 have a smaller frictional force than the external screw portion 1b of the bolt 1 and the internal thread portion 2b of the key nut 2, the exclusive tightening nut 3 When the key nut 2 is rotated in the loosening direction, the key nut 2 does not rotate in the loosening direction together with the tightening nut 3, but only the tightening nut 3 is loosened with respect to the key nut 2, and is opposite to the tightened coupling members 6 and 7. Retreat to and disengage from the key nut 2. As a result, the key nut 2 cannot be directly gripped and loosened with a tool such as a wrench or spanner.

  2A to 2C are views showing a tightening and coupling device 102 according to a second embodiment of the present invention. As shown in FIG. 2A, the tightening coupling device 102 includes a bolt 1, a key nut 21, and a tightening nut 31. In FIG. 2A, a side view is shown about the volt | bolt 1, and about each nut 21 and 31, the side view is shown on the right side from the centerline, and sectional drawing is shown on the left side. The key nut 21 and the tightening nut 31 are different from the key nut 2 and the tightening nut 3 shown in FIG. 1A and the like in that the outer peripheral surface of the key nut 21 and the inner peripheral surface of the tightening nut 31 are square in cross section. This is a point in which a threadable male screw portion 2e and a female screw portion 3e each having a trapezoidal shape or a substantially square shape are formed. That is, while the male thread 2e of the key nut 21 and the female thread 3e of the exclusive nut 31 are trapezoidal screws or square screws suitable for moving screws, the male thread 1b of the bolt 1 and the female thread of the key nut 21 The part 2b is a triangular screw. As a result, the male screw portion 2e and the female screw portion 3e are rougher in shape than the male screw portion 1b and the female screw portion 2b, and the frictional force at the time of screwing is significantly smaller, making it easier to tighten or loosen. It has become. The male screw portion 2e and the female screw portion 3e are right-handed screws in which the winding direction of the screw thread is rising to the right, like the male screw portion 1b and the female screw portion 2b. The fastening nut 31 is a versatile hexagon nut.

  The procedure of tightening and coupling the tightened coupling members 6 and 7 by the tightening and coupling device 102 is the same as that of the tightening and coupling device 101. That is, first, the main body 1a of the bolt 1 is passed through the washer 5 and the holes 5a, 6a and 7a of the tightened coupling members 6 and 7, and the female thread 2b of the key nut 21 is screwed with the male thread 1b of the bolt 1. In addition, the female screw portion 3e of the exclusive nut 31 is screwed with the male screw portion 2e of the key nut 21. Next, the special nut 31 is rotated in the tightening direction with a tool such as a wrench or spanner, and the key nut 21 is tightened with respect to the bolt 1 and the tightened coupling members 6 and 7, and the key nut 21 as shown in FIG. 2B. And the head 1c of the bolt 1 are fastened and joined by the tightened coupling members 6 and 7. Then, by rotating the tightening nut 31 with a tool such as a wrench or spanner in the loosening direction, the key nut 21 is tightened without loosening the bolt 1 and the tightened coupling members 6 and 7 as shown in FIG. 2C. Remove the special nut 31 from the key nut 21.

  3A to 3E are views showing a tightening and coupling device 103 according to a third embodiment of the present invention. As shown in FIG. 3A, the tightening and coupling device 103 includes a bolt 11, a key nut 22, a tightening nut 3, and a loosening nut 4. 3A, a side view is shown for the bolt 11, a side view is shown on the right side of the center line, and a cross-sectional view is shown on the left side for each of the nuts 22, 3, and 4. FIG. The difference between the bolt 11 and the bolt 1 shown in FIG. 1A and the like is the axial lengths of the main body 1a and the external thread 1b. The main body 1a and the external thread 1b of the bolt 11 are longer in the axial direction than the main body 1a and the external thread 1b of the bolt 1. The bolt 11, like the bolt 1, is a general hex bolt with high versatility.

  The key nut 22 is different from the key nut 2 shown in FIG. 1A and the like in the shape of the main body 2a and the external thread 2f. The main body 2a of the key nut 22 is longer in the axial direction than the main body 2a of the key nut 2. Between the external thread 2c and the flange 2d of the outer peripheral surface of the main body 2a of the key nut 22, an external thread 2f different from the external thread 2c is formed. The threaded portion 2f of the key nut 22 has a larger diameter (outer diameter, effective diameter, valley diameter, and inner diameter), a thread pitch, and the like than the threaded portion 2c of the key nut 22. A flange portion 2g having a diameter larger than the outer diameter of the male screw portion 2c is formed in parallel with the flange portion 2d at the end of the male screw portion 2f on the male screw portion 2c side. The loosening-only nut 4 is a versatile hexagon nut. The cylindrical body portion 4a of the loosening-only nut 4 has a hexagonal shape when viewed from the axial direction, so it can be held and fixed with a general-purpose tool such as a general wrench or spanner. It can be rotated around. A female screw portion 4 f that can be screwed with the male screw portion 2 f of the key nut 22 is formed on the inner peripheral surface of the body portion 4 a of the loosening-only nut 4.

  The male screw portion 2f of the key nut 22 and the female screw portion 4f of the loosening-only nut 4 are left-handed screws with the thread winding direction rising to the left, and are triangular screws with a triangular cross-sectional shape of the thread. is there. From the thread pitch P1 of the male thread portion 1b of the bolt 11 and the female thread portion 2b of the key nut 22, and from the thread pitch P2 of the female thread portion 2c of the key nut 22 and the female thread portion 3c of the exclusive nut 3, the key nut 22 The thread pitch P3 of the male screw portion 2f and the female screw portion 4f of the loosening exclusive nut 4 is larger (P1 <P2 <P3). As a result, the male screw portion 2f and the female screw portion 4f have a rougher shape than the male screw portions 1b and 2c and the female screw portions 2b and 3c, and the frictional force at the time of screwing is small. Has become easier.

  The procedure for tightening and coupling the tightened coupling members 6 and 7 by the tightening and coupling device 103 is the same as that of the tightening and coupling device 101. That is, first, the main body 1a of the bolt 11 is passed through the washer 5 and the holes 5a, 6a, 7a of the to-be-tightened coupling members 6, 7, and the female thread 2b of the key nut 22 is screwed with the male thread 1b of the bolt 11. The female screw portion 3c of the exclusive nut 3 is screwed with the male screw portion 2c of the key nut 22. Next, the tightening nut 3 is rotated in the tightening direction with a tool such as a wrench or a spanner, and the key nut 22 is tightened against the bolt 11 and the tightened coupling members 6 and 7, and the key nut 22 as shown in FIG. 3B. And the head 1c of the bolt 11 are fastened and joined by the tightened coupling members 6 and 7. At this time, the nut for exclusive use of tightening 3 comes into contact with the flange portion 2g and pushes the flange portion 2g toward the to-be-tightened coupling members 6 and 7, whereby the key nut 22 rotates in the tightening direction together with the nut for exclusive tightening 3 and is tightened. go. Then, by rotating the tightening nut 3 in the loosening direction with a tool such as a wrench or spanner, the key nut 22 is tightened without loosening the bolt 11 and the tightened coupling members 6 and 7 as shown in FIG. 3C. Remove the special nut 3 from the key nut 22.

  In the procedure for releasing the tightened coupling state of the tightened coupling members 6 and 7 in FIG. 3C, first, the female thread portion 4f of the loosening exclusive nut 4 is screwed into the male thread portion 2f of the key nut 22. Next, the loosened nut 4 is rotated in the tightening direction (counterclockwise) with a tool such as a wrench or spanner, and is advanced toward the tightened coupling members 6 and 7, and tightened against the key nut 22. Then, as shown in FIG. 3D, after the loosening-only nut 4 comes into contact with the flange 2d of the keynut 22, the loosening-only nut 4 is further rotated in the tightening direction, whereby the keynut 22 is connected to the bolt 11 and the tightened coupling member. Loosen against 6,7. Specifically, as the loosening-only nut 4 rotates counterclockwise, the key nut 22 rotates counterclockwise (in the loosening direction) together with the loosening-only nut 4 and, as shown in FIG. It moves backward to the opposite side and loosens with respect to the bolt 1 and the tightened coupling members 6 and 7. Thereafter, the key nut 22 and the loose nut 4 are removed from the bolt 11, and the bolt 11 is removed from the tightened coupling members 6, 7 and the washer 5.

  According to the embodiment described above, since the flange portions 2d and 2g are formed together with the screw portions 2c, 2e and 2f on the outer peripheral surfaces of the key nuts 2, 21 and 22, the washer 5 and the tightened coupling members 6 and 7 are formed. Bolts 1 and 11 are passed through the holes 5a, 6a and 7a, and the bolts 1 and 11 and the nuts 2, 21, 22, 3, and 31 are screwed together, and then the nuts 3 and 31 for tightening are rotated in the tightening direction. By doing so, the key nuts 2, 21, 22 are securely tightened to the bolts 1, 11 and the tightened coupling members 6, 7 by pushing the collar 2 d or the collar 2 g with the nuts 3, 31 for tightening. Can do. For this reason, the to-be-tightened coupling members 6 and 7 can be firmly tightened and coupled with the key nuts 2, 21 and 22 and the heads 1 c of the bolts 1 and 11.

  Further, from the female threaded part 1b of the bolts 1 and 11 and the female threaded part 2b of the key nuts 2, 21, and 22, the female threaded parts 2c and 2e of the key nuts 2, 21, and 22 and the female threaded part 3c of the exclusive nuts 3 and 31 are secured. Since the shape of 3e is coarser, the frictional force at the time of screwing becomes small and can be easily loosened. In particular, as shown in FIG. 1A, FIG. 3A, etc., when the thread pitch of the external thread part 2c and the internal thread part 3c is made larger than the thread part 1b and the internal thread part 2b to roughen the shape, It is possible to easily reduce the frictional force at the time of engagement, and to easily make it easy to loosen. Further, as shown in FIG. 2A and the like, the screw thread 1b and the female thread part 2b have a triangular cross section, and the male thread 2e and the female thread 3e have a square cross section. If the shape of the external thread part 2e and the internal thread part 3e is made rougher than that of the internal thread part 1b and the internal thread part 2b, the friction force at the time of the latter screwing can be made much smaller than that of the former so that it can be easily loosened. For this reason, after the key nuts 2, 21, 22 and the heads 1 c of the bolts 1, 11 are coupled by tightening the tightened coupling members 6, 7, the key nuts 2, 21, 22 are more securely tightened without loosening more securely. It is possible to remove the nuts 3, 31 from the key nuts 2, 21, 22 by rotating them in the loosening direction.

  Then, after tightening the to-be-tightened coupling members 6 and 7 with the key nuts 2, 21 and 22 and the heads 1 c of the bolts 1 and 11, the exclusive nuts 3 and 31 are removed from the key nuts 2, 21 and 22. The key nuts 2, 21, and 22 cannot be directly gripped and loosened by a general-purpose tool such as a general wrench or spanner. The third party mischief of the bolts 1, 11 and the key nuts 2, 21, 22 It is possible to reliably prevent loosening and detachment due to. As a result, it is possible to prevent the occurrence of damage such as the joint portions of the tightened coupling members 6 and 7 having insufficient strength or the tightened coupling members 6 and 7 being taken away.

  Moreover, since the general purpose hexagon bolt and hexagon nut which are highly versatile are used as the bolts 1 and 11 and the fastening nut 3, and the versatile hexagon nut is used as the fastening nut 31, the versatility is high. The bolts 1 and 11 and the exclusive nuts 3 and 31 are gripped with a general tool such as a wrench or spanner, and one is fixed and the other is rotated to tighten the key nuts 2, 21, and 22, and the tightened coupling member 6 and 7 can be easily tightened and coupled, and the nuts 3 and 31 for exclusive tightening can be rotated and removed without loosening the key nuts 2, 21 and 22. For this reason, a special dedicated tool is not required, cost can be kept low, and workability can be improved.

  Further, as shown in FIG. 3A and the like, a screw portion 2f is formed on the outer peripheral surface of the key nut 22, and a loosening exclusive nut 4 having a female screw portion 4f that can be screwed to the male screw portion 2f is provided. The direction of winding of the screw thread of the female screw portion 4f is opposite to the direction of winding of the screw threads of the other bolts 11, the exclusive tightening nut 3, and the male screw portions 1b, 2c and the female screw portions 2b, 3c of the key nut 22. Therefore, after tightening and tightening the to-be-tightened coupling members 6 and 7, and removing the exclusive nut 3 from the key nut 22, the female screw portion 4f is screwed with the external screw portion 2f and the loosening exclusive nut 4 is tightened. By rotating in the direction, the key nut 22 can be easily and surely loosened or removed from the bolt 11 and the tightened coupling members 6 and 7 by the loosening-only nut 4.

  In addition, since a universal hexagonal nut is used as the loosening nut 4, the loosening nut 4 is grasped with a general-purpose tool such as a general wrench or a spanner and rotated in the tightening direction. 22 can be more easily and reliably loosened and removed, no special dedicated tool is required, and the cost can be kept low and workability can be improved. However, the bolt 11, the tightening nut 3, and the male screw portions 1 b, 2 b and the female screw portions 2 c, 3 c of the key nut 22 are right-handed threads, whereas the male screw portion 2 f of the key nut 22 and the loosening exclusive nut 4 are used. Since the female thread 4f is a left-hand thread that is less general and less common than the right-hand thread, the loosening-only nut 4 or its substitute is rare and difficult to obtain by a third party, and it is tightened After the attachment members 6 and 7 are tightened and joined, the bolt 11 and the key nut 22 can be further prevented from loosening and coming off due to third party mischief.

  Further, the key nut 22 is detachable by tightening or loosening the bolt 11 and the tightened coupling members 6 and 7 by the tightening nut 3 and the loosening nut 4, and the key nut 22 and the head 1 c of the bolt 11 are detachable. Since the tightened coupling members 6 and 7 can be coupled by being tightened or released, the convenience of the tightening coupling device 103 can be enhanced.

  The present invention can adopt various forms other than the embodiment described above. For example, in the above embodiment, by changing the pitch of the screw thread or by using a triangular screw or a square screw, the male screw portion 1b of the bolts 1 and 11 and the female screw portion 2b of the key nuts 2, 21, and 22 are used. In this example, the male screw portions 2c and 2e of the key nuts 2, 21 and 22 and the female screw portions 3c and 3e of the nuts 3 and 31 for tightening are roughened. The latter may be made rougher than the former by increasing the inclination angle of the latter thread from the former or by making the former a single thread and making the latter a multiple thread.

  Moreover, in the above embodiment, general-purpose general hexagon bolts and hexagon nuts are used as the bolts 1 and 11 and the tightening nut 3, and general-purpose hexagons are used as the tightening nut 31 and the loosening nut 4. Although an example using a nut is given, other than this, for example, a bolt or nut having a special shape that can be tightened or loosened only with a special dedicated tool may be used. If it does in this way, it will become possible to aim at prevention of mischief of a bolt and a key nut in the state where a to-be-tightened connecting member was fastened and combined.

  Furthermore, in 3rd Embodiment shown to FIG. 3A etc., the external thread part 2c which screw-engages the exclusive nut 3 to the front end side (opposite side of the collar part 2d) of the key nut 22 is formed, and the root side (the collar part 2d) On the other hand, an external thread part 2f for screwing the exclusive nut 4 is formed on the tip side of the key nut. You may make it form the external thread part which screw-fits the exclusive nut 3 to the base side.

It is a figure which shows the clamping coupling device which concerns on 1st Embodiment of this invention. It is a figure which shows the clamping coupling device which concerns on 1st Embodiment of this invention. It is a figure which shows the clamping coupling device which concerns on 1st Embodiment of this invention. It is a figure which shows the clamp | tightening coupling device which concerns on 2nd Embodiment of this invention. It is a figure which shows the clamp | tightening coupling device which concerns on 2nd Embodiment of this invention. It is a figure which shows the clamp | tightening coupling device which concerns on 2nd Embodiment of this invention. It is a figure which shows the clamping coupling device which concerns on 3rd Embodiment of this invention. It is a figure which shows the clamping coupling device which concerns on 3rd Embodiment of this invention. It is a figure which shows the clamping coupling device which concerns on 3rd Embodiment of this invention. It is a figure which shows the clamping coupling device which concerns on 3rd Embodiment of this invention. It is a figure which shows the clamping coupling device which concerns on 3rd Embodiment of this invention.

Explanation of symbols

1, 11 Bolt 1a Body 1b Male thread 1c Head 2, 21, 22 Key nut 2a Main body 2b Female thread 2c, 2e, 2f Male thread 2d, 2g Hut 3, 31 Nut dedicated nut 3a Body 3c 3e Female thread part 4 Loose nut 4a Body part 4f Female thread part 6, 7 Tightened coupling member 6a, 7a Hole 101-103 Tightening coupling device P1, P2 Pitch

Claims (6)

A screw part is formed on the outer peripheral surface of the rod-shaped main body part, a head is formed at one end, and the main body part is a bolt that penetrates a hole formed in the tightened coupling member;
A female screw portion that can be screwed with the male screw portion of the bolt is formed on the inner peripheral surface of the cylindrical main body portion, and a screw portion and a circular flange portion are formed on the outer peripheral surface, and the bolt is combined with the bolt. And a key nut for tightening and coupling the tightened coupling member,
A female screw portion that can be screwed with the male screw portion of the key nut is formed on the inner peripheral surface of the cylindrical main body portion, and combined with the key nut, the key nut is fastened to the bolt and the tightened coupling member, A tightening-dedicated nut removed from the key nut in the tightened coupling state of the tightened coupling member,
Tightening coupling characterized in that the shape of the male threaded portion of the key nut and the female threaded portion of the exclusive tightening nut is rougher than the shape of the female threaded portion of the bolt and the female threaded portion of the key nut. apparatus. The tightening and coupling device according to claim 1,
The pitch of the thread of the male thread of the key nut and the thread of the female thread of the key nut is larger than the pitch of the thread of the female thread of the key nut and the female thread of the key nut. Tightening coupling device characterized. The tightening and coupling device according to claim 1 or 2,
The cross-sectional shape of the thread of the male screw portion of the bolt and the female screw portion of the key nut is a triangle, and the cross-sectional shape of the screw thread of the male screw portion of the key nut and the female screw portion of the exclusive nut is A tightening and coupling device characterized by being a quadrangle. The tightening and coupling device according to any one of claims 1 to 3,
A male screw portion different from the male screw portion is formed on the outer peripheral surface of the key nut,
A female thread portion that can be screwed with the other male thread portion of the key nut is formed on the inner peripheral surface of the cylindrical main body portion, and the key nut is combined with the key nut with respect to the bolt and the tightened coupling member. It has a special nut for loosening,
The winding direction of the thread of the other threaded portion of the key nut and the threaded portion of the exclusive nut is the threaded portion of the bolt, the threaded portion of the tightening nut, and the threaded portion. A tightening and coupling device, wherein the threaded direction of the threaded part of the female threaded part and the male threaded part of the key nut that can be screwed is opposite. A screw part is formed on the outer peripheral surface of the rod-shaped main body part, and the main body part of a bolt having a head formed at one end is passed through a hole formed in the tightened coupling member.
Next, an internal thread portion that can be screwed with the external thread portion of the bolt is formed on the inner peripheral surface of the cylindrical main body portion, and an external thread portion and a circular shape that are coarser than the external thread portion of the bolt are formed on the outer peripheral surface. The female screw portion of the key nut formed with the flange portion can be screwed with the male screw portion of the bolt, and can be screwed with the male screw portion of the key nut on the inner peripheral surface of the cylindrical main body portion. Screwing the female screw part of the nut for exclusive use in which a female screw part is formed with the male screw part of the key nut;
Next, the key nut is tightened with respect to the bolt and the tightened coupling member by rotating the nut for exclusive tightening to one side, and the tightened coupling member is tightened with the key nut and the head portion of the bolt. Combine and
Next, the tightening and coupling method is characterized in that the nut for exclusive tightening is removed from the key nut by rotating the nut for exclusive tightening to the other side without loosening the key nut with respect to the bolt and the tightened coupling member. . In the tightening and coupling method according to claim 5,
Separately from the male screw portion, an outer thread surface of the key nut is formed with a male screw portion in which the winding direction of the screw thread and the male screw portion of the bolt are opposite to each other,
The female screw of the loosening-only nut in which a female screw portion that can be screwed with the other male screw portion of the key nut is formed on the inner peripheral surface of the cylindrical main body portion after the nut for exclusive tightening is removed from the key nut Threaded part with the other threaded part of the key nut,
Next, the tightening coupling method is characterized in that the key nut is loosened with respect to the bolt and the tightened coupling member by rotating the loosening exclusive nut in one direction.

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