JP2013032820A - Fastening bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening bolt applicable to a narrow place where a wrench is hardly put in, and repeatedly usable.SOLUTION: The fastening bolt 1 is intended for planting the same in a base, for instance, mounting a machine and fastening the machine with a nut 2. In contrast to a screw 12 on the tip side of the bolt body 10, a screw 11 on the base side is set at a left-handed screw. With this, the fastening bolt becomes applicable to a narrow place where a wrench is hardly put in. Further, since the bolt body 10 is not forcedly screwed in a nut different in the size of its pitch, the screw thread is not collapsed, and repeated use is possible.

Description

  The present invention relates to a tightening bolt including a bolt body in which male screws are discontinuously formed from a distal end side to a proximal end side.

  For example, clamping bolts such as studs are used to secure the machine to the base. The planting bolt is such that the tip side is planted on the base, the machine is fitted on the base end side and tightened with a nut, and the machine is fixed to the base only by the pressure of the nut seating surface.

  Therefore, if the machine vibrates or the like, the seating surface of the nut will float, and it is necessary to construct a locking mechanism. The most common method for preventing loosening is a so-called double nut.

  Here, loosening can be prevented by tightening the two nuts doubly. In addition, two nuts are not only engaged, but one side is eccentric so that a force in a direction perpendicular to the axis also acts to prevent loosening (see, for example, Patent Documents 1 and 2).

  However, in the techniques of Patent Documents 1 and 2, it is necessary to simultaneously tighten or loosen the upper and lower nuts in the opposite direction. At this time, the wrench used when tightening or loosening the upper nut may become an obstacle, and it may be difficult to use the wrench that tightens or loosens the lower nut. For this reason, it is difficult to apply them to narrow places where wrench is difficult to enter. In addition, the bolt becomes higher by the amount of the double nut, which also makes it more difficult to apply to narrow spaces.

  Therefore, in Patent Document 3, for example, one screw portion that is inserted through the insertion hole of the tightened member and screwed into the screw hole of the female screw member, and the other is screwed into the protruding end portion from the tightened member. The screw portion of the one screw portion that is screwed in the screw hole is configured to be a rotation prevention device for the stud bolt in which the screw portion is the same screw direction and the nut is prevented from being rotated by the rotation preventing means. An anti-rotation device for an implanted bolt that is smaller than the thread pitch of the other threaded portion that is screwed together is disclosed. In this case, it is described that the detent is achieved only by the screw pitch difference on both sides of the bolt.

  In Patent Document 3, the bolt is forcibly screwed into a nut having a different pitch, and therefore, the screw thread is crushed and cannot be used repeatedly.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tightening bolt that can be applied to a narrow place where a wrench is difficult to enter and can be used repeatedly. is there.

  The present invention is a tightening bolt including a bolt body in which male screws are discontinuously formed from the distal end side to the proximal end side, and the proximal end side is a reverse screw with respect to the distal end side of the bolt body. It is characterized by this.

  According to the present invention, since the proximal end side is a reverse screw with respect to the distal end side of the bolt body, for example, as an implanted bolt, the distal end side is implanted in the base and the machine is fitted, and then screwed into the proximal end side. Tighten the machine with the tightened nut. Then, even if the machine vibrates, the machine is fixed to the base with the pressure between the screw faces, as in the case of the double nut, so that the nut seat does not float and effective locking is prevented. Can be constructed.

  Moreover, unlike the double nut, there is no need to tighten or loosen the upper and lower nuts simultaneously and in the opposite direction. Therefore, it is easy to apply to a narrow place where a wrench is difficult to enter. Further, unlike the double nut, the bolt body is not so high, and this also makes it easier to apply to narrow spaces. Further, since the bolt is not forcibly screwed into a nut having a different pitch, the screw thread is not crushed and can be used repeatedly.

  Moreover, it is preferable that the base end side has a larger diameter than the front end side of the bolt body.

  In this case, since the base end side has a larger diameter than the front end side of the bolt main body, when the front end side of the bolt main body is screwed, the base end side and the front end side of the bolt main body are The discontinuous part of the male screw is received. This eliminates the risk of forcibly screwing the bolt body.

  Moreover, it is preferable to decenter the base end side with respect to the front end side of the bolt body.

  In this case, since the proximal end side is eccentric with respect to the distal end side of the bolt main body, when the distal end side of the bolt main body is screwed, a step portion formed thereby causes a difference between the proximal end side and the distal end side of the bolt main body. The discontinuous part of the male screw is received. This eliminates the risk of forcibly screwing the bolt body. When the bolt body is loosened, the rotation direction and the sliding surface are different between the distal end side and the proximal end side of the bolt body, so that it works as a loosening prevention.

  Moreover, it is preferable to form a hexagon hole having a smaller diameter than the base end at the base end of the bolt body.

  In this case, since the hexagon hole having a smaller diameter than the base end is formed at the base end of the bolt body, the bolt body can be easily screwed by fitting a hexagon wrench into the hexagon hole.

  Alternatively, it is preferable that a head having a diameter larger than that of the base end is provided at the base end of the bolt body, and a hexagon head or a hexagon hole is formed in the head.

  In this case, a head having a larger diameter than the base end is provided at the base end of the bolt body, and a hexagon head or a hexagon hole is formed in the head. The bolt body can be screwed and the top surface of the nut can be pressed by the bottom surface of the head. As a result, when the screw is screwed in, the incomplete end where the screw start part and the part where the screw thread does not meet is less affected by the friction between the screw surfaces and the seating surface friction. The friction between them works independently.

  Moreover, it is preferable that the pressure receiving part which extends in parallel with the base end side of the said bolt main body is substantially folded back | turned around the periphery so that the vertical cross section may become a reverse mountain shape.

  In this case, the base portion of the bolt body is formed by substantially folding back the vicinity of the periphery of the head so that the vertical cross section is an inverted mountain shape and extending in parallel with the base end side of the bolt body. A preload is applied to the base end side of the bolt body by screwing a nut or washer to the side, and after tightening the bolt, the preload is released to the front end side of the bolt body by loosening the nut or washer. Can do. This is convenient because the bolt axial force can be managed.

  Moreover, it is preferable to provide the nut which formed continuously from the one end side to the other end side the female screw which can be screwed together in the base end side of a volt | bolt main body.

  In this case, a female screw that can be screwed to the base end side of the bolt body is provided with a nut that is continuously formed from one end side to the other end side. There will be an effect.

  Moreover, it is preferable that a nut forms the step part which can receive the discontinuous part of the external thread of the base end side of a bolt main body, and a front end side in the said one end side or the said other end side.

  In this case, the nut is formed with a stepped portion on the one end side or the other end side that can receive the discontinuous portion of the male screw between the base end side and the tip end side of the bolt body. The discontinuous portion of the male screw between the proximal end side and the distal end side of the main body is received. This eliminates the risk of forcibly screwing the bolt body.

  Or it is preferable to provide the washer which formed the female screw which can be screwed together in the base end side of a volt | bolt main body from the one end side to the other end side continuously.

  In this case, a female screw that can be screwed to the base end side of the bolt body is provided with a washer that is continuously formed from one end side to the other end side. It will be effective.

  Moreover, it is preferable that a washer forms a recessed part in the said one end side or the said other end side.

  In this case, since the washer is formed with the concave portion on the one end side or the other end side, it is not affected by the incomplete screw thread, and the left screw surface, the right screw surface, and the seating surface friction work independently. Therefore, the pressure due to the seating surface friction can be effectively used.

  The bolt body has a first bolt body in which a male screw and a female screw hole are formed coaxially on a distal end side, and a second screw in which a male screw that can be screwed into the female screw hole is formed on a proximal end side. It is preferable that a bolt main body is provided, and the male screw on the base end side of the second bolt main body is a reverse screw with respect to the male screw on the front end side of the first bolt main body.

  In this case, the bolt body has a first bolt body in which a male screw and a female screw hole are formed coaxially on the distal end side, and a male screw that can be screwed into the female screw hole on the proximal end side. It has a two-bolt body, and since the male screw on the base end side of the second bolt body is a reverse screw with respect to the male screw on the tip side of the first bolt body, an effective loosening prevention is applied with one touch. can do.

  According to the present invention, since the proximal end side is a reverse screw with respect to the distal end side of the bolt main body, for example, as an implanted bolt, the distal end side is implanted in the base and the machine is fitted, and the nut is fitted in the proximal end side. Tighten the machine. Then, even if the machine vibrates, the machine is fixed to the base with the pressure between the screw faces, as in the case of the double nut, so that the nut seat does not float and effective locking is prevented. Can be constructed.

  Moreover, unlike the double nut, there is no need to tighten or loosen the upper and lower nuts simultaneously and in the opposite direction. Therefore, it is easy to apply to a narrow place where a wrench is difficult to enter. Also, unlike the double nut, the bolt is not so high, and this also makes it easier to apply to confined places. Further, since the bolt is not forcibly screwed into a nut having a different pitch, the screw thread is not crushed and can be used repeatedly.

It is a disassembled perspective view of the fastening bolt concerning Embodiment 1 of the present invention. It is element explanatory drawing of the clamping bolt which concerns on Embodiment 1 of this invention. It is assembly explanatory drawing of the clamping bolt which concerns on Embodiment 1 of this invention. It is installation explanatory drawing (step S1) by the clamp | tightening bolt which concerns on Embodiment 1 of this invention. It is installation explanatory drawing (step S2) by the fastening bolt which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the fastening bolt concerning Embodiment 2 of the present invention. It is element explanatory drawing of the fastening bolt which concerns on Embodiment 2 of this invention. It is assembly explanatory drawing of the clamping bolt concerning Embodiment 2 of this invention. It is explanatory drawing of the fastening bolt which concerns on Embodiment 3 of this invention. It is explanatory drawing of the clamping bolt which concerns on Embodiment 4 of this invention. It is explanatory drawing of the fastening bolt which concerns on Embodiment 5 of this invention. It is explanatory drawing of the clamping bolt which concerns on Embodiment 6 of this invention. It is explanatory drawing of the clamping bolt which concerns on Embodiment 7 of this invention. It is explanatory drawing of the clamping bolt which concerns on Embodiment 8 of this invention.

(Embodiment 1)
1 is an exploded perspective view of a tightening bolt 1 according to Embodiment 1 of the present invention, FIG. 2 is an element explanatory view of the tightening bolt 1, (a) is a plan view of the nut 2, and (b) is a nut. 2 is a side view of FIG. 2, (c) is a cross-sectional view taken along line B-B of (b), and (d) is a side view of the bolt body 10. 3 is an assembly explanatory view of the tightening bolt 1, wherein (a) is a perspective view, (b) is a plan view, (c) is a side view, and (d) is an AA line of (c). It is sectional drawing.

  As shown in FIGS. 1 to 3, the tightening bolt 1 according to the first embodiment has a bolt body 10 made of, for example, high-tensile steel, and the tip side of the bolt body 10 is implanted into a base and a machine. It is a stud bolt that tightens the machine with a nut 2 fitted from the base end side. Then, the screw 11 on the proximal end side is a reverse screw with respect to the screw 12 on the distal end side of the bolt body 10. For example, it is assumed that the front end side of the bolt body is an M6 right screw, the base end side is an M8 narrow left screw, and the pitch of both screws is 1 mm.

  A hexagon hole 13 into which a hexagon wrench (not shown) can be inserted is formed at the base end of the bolt body 10. The through hole 20 of the nut 2 is provided with a female screw 21 capable of screwing the male screw 11 of the bolt body 10 from one end side to the other end side. The nut 2 is made of, for example, a synthetic resin.

  FIG. 4 is an installation explanatory diagram (step S1) using the tightening bolt 1 according to the first embodiment of the present invention, and FIG. 5 is an installation explanatory diagram (step S2) using the tightening bolt 1 according to the first embodiment of the present invention. Hereinafter, with reference to FIG.4 and FIG.5, the usage method of this clamping bolt 1 is demonstrated.

  Now, a tightening bolt 1 is prepared in which the nut 2 is loosely screwed to the base end side of the bolt body 10. As shown in step S1 of FIG. 4, a hexagon wrench 5 is inserted into the hexagon hole 13 formed at the base end of the bolt body 10 of the tightening bolt 1, and the hexagon wrench 5 is rotated clockwise (CW in FIG. 4). ), The front end side of the bolt body 10 of the tightening bolt 1 is screwed into the screw hole 41 of the base 4 and fitted into the through hole 31 of the machine 3. Then, as shown in step S2 of FIG. 5, when the bottom surface of the nut 2 touches the machine 3, the nut 2 is rotated counterclockwise (CCW direction in FIG. 5) by a normal wrench 6. Then, the female screw 21 of the nut 2 and the male screw 11 on the base end side of the bolt main body 10 are securely screwed together. The machine 3 can be firmly fixed to the base 4 by the frictional force between the screw surfaces at this time. In this case, the machine 3 can be fixed more firmly than when the machine 3 is fixed to the base 4 by mere seating surface friction.

  In order to loosen the fastening bolt 1, in FIG. 5, the nut 2 is rotated clockwise (opposite to CCW in FIG. 5) with a normal wrench 6 (not shown). Then, since the frictional force between the screw surfaces disappears, the machine 3 can be removed after removing the nut 2. Then, in FIG. 4, a hexagon wrench 5 is inserted into a hexagon hole 13 formed at the base end of the bolt body 10 of the tightening bolt 1, and this hexagon wrench 5 is rotated counterclockwise (opposite to CW in FIG. 5). The bolt body 10 of the tightening bolt 1 can be easily removed from the base 4 by rotating to the base 4.

  According to the tightening bolt 1, since the proximal end side screw 11 is a reverse screw with respect to the distal end side screw 12 of the bolt body 10, for example, as an implanted bolt, the distal end side is a screw hole 41 of the base 4. When the machine 3 is tightened with the nut 2 fitted from the base end side and is inserted into the through hole 31 of the machine 3, even if the machine 3 vibrates, the screw surface is the same as in the case of the double nut. Since the machine 3 can be firmly fixed to the base 4 with the pressure in between, the seat surface of the nut 2 is not lifted, and an effective loosening stopper can be constructed.

  Moreover, unlike the double nut, there is no need to tighten or loosen the upper and lower nuts simultaneously and in the opposite direction. Therefore, it is easy to apply to a narrow place where a normal wrench is difficult to enter. Also, unlike the double nut, the height of the bolt body 10 is not so high, and this also makes it easier to apply to narrow spaces. Further, since the bolt body 10 is not forcibly screwed in, the screw thread is not crushed and can be used repeatedly.

(Embodiment 2)
6 is an exploded perspective view of a fastening bolt 1a according to Embodiment 2 of the present invention, FIG. 7 is an element explanatory view of the fastening bolt 1a, (a) is a plan view of the nut 2a, and (b) is a nut. FIG. 2C is a side view of 2a, (c) is a sectional view taken along the line CC of (b), and (d) is a side view of the bolt body 10a. 8 is an assembly explanatory view of the tightening bolt 1a, in which (a) is a perspective view, (b) is a plan view, (c) is a side view, and (d) is a DD line of (c). It is sectional drawing. Detailed description of elements common to the first embodiment is omitted.

  As shown in FIGS. 6 to 8, in the tightening bolt 1a according to the second embodiment, the outer diameter of the screw 11a on the proximal end side is set larger than the outer diameter of the screw 12a on the distal end side of the bolt body 10a. It is a thing. For example, it is assumed that the front end side of the bolt body 10a is an M6 right screw, the base end side is an M8 narrow left screw, and the pitch of both screws is 1 mm. This is the same as the first embodiment.

  However, in the tightening bolt 1a according to the second embodiment, unlike the first embodiment, the base end of the bolt body 10a is not formed with a hexagonal hole, and the nut 2a has a lower end side of the through hole 20a. A step 22a is provided on the other end side. A female screw 21a capable of screwing the male screw 11a of the bolt body 10a is formed above the stepped portion 22a.

  Hereinafter, a method of using the tightening bolt 1a will be described.

  Now, a tightening bolt 1a is prepared in which the nut 2a is loosely screwed to the base end side of the bolt body 10a. The nut 2a screwed to the base end side of the bolt body 10a of the tightening bolt 1a is rotated clockwise with a wrench (not shown). During this time, the base end side of the bolt main body 10a of the tightening bolt 1a is caught by the step portion 22a of the nut 2a, so that the base end side is not detached from the nut 2a. When the bottom surface of the nut 2a touches the machine, the rotation in the direction in which the screw 12a on the distal end side of the bolt body 10a is loosened causes the screw 11a on the base end side to act as a loosening prevention.

  The tightening bolt 1a of the second embodiment is used in principle when it is not necessary to loosen, but if it is also required to loosen the tightening bolt 1a, as in the first embodiment, the bolt What is necessary is just to provide the hexagon hole 13a which is not shown in figure at the base end of the main body 10a. In that case, a hexagon wrench (not shown) is inserted into the hexagon hole 13a formed at the base end of the bolt main body 10a of the tightening bolt 1a, the hexagon wrench is rotated counterclockwise, and the nut 2a is not shown in the normal figure. Rotate to the right with a wrench. Then, since the frictional force between the screw surfaces disappears, the machine can be removed after removing the nut 2a. Then, a hexagon wrench (not shown) is inserted into a hexagon hole 13a formed at the base end of the bolt body 10a of the tightening bolt 1a, and the hexagon wrench is rotated counterclockwise, whereby the bolt body 10a of the tightening bolt 1a. Can be easily removed from the base.

(Embodiment 3)
FIGS. 9A and 9B are explanatory diagrams of a fastening bolt 1b according to Embodiment 3 of the present invention, in which FIG. 9A is a perspective view, FIG. 9B is a plan view, FIG. 9C is a side view, and FIG. It is the EE sectional view taken on the line. Detailed description of elements common to the first and second embodiments is omitted.

  As shown in FIG. 9, in the fastening bolt 1b according to the third embodiment, the screw 11b on the base end side is slightly eccentric (offset) with respect to the screw 12b on the tip end side of the bolt main body 10b. For example, the bolt body 10b is an M6 right screw, its base end is an M8 narrow left screw, and the pitch of both screws is 1 mm. Here, the center is offset by 0.5 mm using the difference in diameter between the two screws.

  Further, as in the second embodiment, the base end of the bolt body 10b is not formed with a hexagonal hole, and the nut 2b has a step portion 22b in the through hole 20b. A female screw 21b that can be screwed into the male screw 11b on the base end side of the bolt main body 10b is formed above the stepped portion 22b.

  Hereinafter, a method of using the tightening bolt 1b will be described.

  First, a tightening bolt 1b is prepared in which a nut 2b is loosely screwed to the base end side of the bolt body 10b. The nut 2b screwed to the base end side of the bolt body 10b of the tightening bolt 1b is rotated clockwise with a normal wrench (not shown). During this time, the base end side of the bolt main body 10b of the tightening bolt 1b is caught by the step portion 22b of the nut 2b, so that the base end side does not come off from the nut 2b. When the bottom surface of the nut 2b touches the machine, the rotation in the direction in which the left screw 12b on the distal end side of the bolt body 10b is loosened causes the right screw 11b on the base end side to act as a loosening prevention.

  The tightening bolt 1b of the third embodiment is used when it is not necessary to loosen, as in the second embodiment. However, if it is required to loosen the tightening bolt 1b, the first embodiment is used. Similarly to the above, a hexagonal hole 13b (not shown) may be formed at the base end of the bolt body 10b. In that case, a hexagon wrench (not shown) is inserted into a hexagon hole 13b formed at the base end of the bolt body 10b of the tightening bolt 1b, the hexagon wrench is rotated counterclockwise, and the nut 2b is not shown in the normal figure. Rotate clockwise with a wrench. Then, since the frictional force between the screw surfaces is lost, the machine can be removed after removing the nut 2b. Then, a hexagon wrench (not shown) is inserted into the hexagon hole 13b formed at the base end of the bolt body 10b of the tightening bolt 1b, and the hexagon wrench is rotated counterclockwise, thereby the bolt body 10b of the tightening bolt 1b. Can be easily removed from the base.

(Embodiment 4)
10A and 10B are explanatory views of a fastening bolt 1c according to Embodiment 4 of the present invention, in which FIG. 10A is a perspective view, FIG. 10B is a plan view, FIG. 10C is a side view, and FIG. It is the FF sectional view taken on the line. Detailed description of elements common to the first to third embodiments is omitted.

  As shown in FIG. 10, in the tightening bolt 1c according to the fourth embodiment, as in the first embodiment, the screw 11c on the proximal end side is a reverse screw with respect to the screw 12c on the distal end side of the bolt body 10c. Yes. For example, it is assumed that the front end side of the bolt main body 10c is an M6 right screw, the base end side is an M8 narrow left screw, and the pitch of both screws is 1 mm. However, since it may be a reverse screw, for example, the front end side of the bolt body may be a right screw of M6 and the base end side may be a narrow left screw of M6. In this case, the base end side is a normal left screw. Convenient because it can be configured.

  When the base end side of the bolt main body is large as in Embodiments 5 to 7 described later, since the reverse screw nut can be assembled only from the tip end side, the left screw has no difference in diameter between the tip end side and the thread valley. And can not be assembled. In that case, the nut is divided into a structure, or is thermally expanded like shrink fitting, or is baked into a male screw, and a nut (no cylinder) is inserted, and a male screw is used for it. The nut thread may be rolled and heat treated.

  On the other hand, if it is this Embodiment 4 and the said Embodiments 1-3, even if the base end side of a volt | bolt main body is the same diameter or a small diameter, a reverse screw nut can be inserted from a base end side. In this case, the strength becomes uneasy, but if left and right screws are engraved like a knurled cross hatch, they can be manufactured and assembled even with different pitches of the same diameter and M dimension.

  By the way, a hexagonal head 13c as a head is formed at the base end of the bolt body 10c of the tightening bolt 1c of the fourth embodiment, instead of the hexagonal hole 13 of the first embodiment. In the tightening bolt 1c according to the fourth embodiment, the hexagon head 13c applies pressure to the upper surface of the nut 2c. That is, the tightening bolt 1c functions as a presser bolt. Instead of forming the head with the hexagon head 13c, a hexagon hole or the like may be formed in the head. That is, any shape that can be used as a bolt head, such as a D-cut, a double-sided cut, a plus groove, or a minus groove, can be used regardless of unevenness. The same applies hereinafter.

  Hereinafter, a method of using the tightening bolt 1c will be described.

  Now, a tightening bolt 1c is prepared in which the nut 2c is loosely screwed to the base end side of the bolt body 10c. A normal wrench (not shown) is inserted into the hexagon head 13c formed at the base end of the bolt body 10c of the tightening bolt 1c, and the tip of the bolt body 10c of the tightening bolt 1c is rotated by rotating the wrench clockwise. Screw the side into the base and fit the machine. When the bottom surface of the nut 2c touches the machine, the nut 2c is further rotated counterclockwise with a normal wrench. Then, the machine can be firmly fixed to the base by the frictional force between the screw surfaces. In this case, it is possible to fix the machine more firmly than when the machine is fixed to the base by mere bearing surface friction.

  When loosening the tightening bolt 1c, the nut 2c is rotated clockwise with a normal wrench (not shown). Then, the frictional force between the screw surfaces disappears. Then, a hexagon wrench (not shown) is further inserted into the hexagon head 13c formed at the base end of the bolt body 10c of the tightening bolt 1c, and the hexagon wrench is rotated counterclockwise so that the bolt body of the tightening bolt 1c. 10c can be easily removed from the base together with the machine.

  According to the tightening bolt 1c, in addition to the same effects as those of the first embodiment, a pressure is applied to the upper surface of the nut 2c with the hexagon head 13c. As a result, when the screw is screwed in, the incomplete end where the screw start part and the part where the screw thread does not meet is less affected by the friction between the screw surfaces and the seating surface friction. The friction between them works independently. And a machine can be firmly fixed to a foundation.

(Embodiment 5)
FIG. 11 is an explanatory view of a fastening bolt 1d according to Embodiment 5 of the present invention, in which (a) is a perspective view, (b) is a plan view, (c) is a side view, and (d) is (c). It is a GG sectional view taken on the line. Detailed description of elements common to the first to fourth embodiments is omitted.

  As shown in FIG. 11, the tightening bolt 1d according to the fifth embodiment includes a washer 2d instead of the nut 2c according to the fourth embodiment. In the tightening bolt 1d, the hexagon head 13d applies pressure to the upper surface of the washer 2d.

  Hereinafter, a method of using the tightening bolt 1d will be described.

  Now, a fastening bolt 1d is prepared in which a washer 2d is loosely screwed to the base end side of the bolt body 10d. An ordinary wrench (not shown) is inserted into the hexagonal head 13d formed at the base end of the tightening bolt 1d, and the wrench is rotated clockwise so that the distal end side of the bolt body 10d of the tightening bolt 1d is used as a base. Screw in and fit the machine. When the bottom surface of the washer 2d touches the machine, the hexagon head 13d is further rotated clockwise with a normal wrench (not shown). Then, the machine can be fixed to the base by the frictional force between the washer 2d and the screw surface on the base end side of the bolt main body 10d. In this case, the machine can be firmly fixed to the base by applying pressure to the upper surface of the washer 2d with the hexagon head 13d formed at the base end of the bolt body 10d.

  When loosening, a normal wrench (not shown) is inserted into the hexagonal head 13d formed at the base end of the bolt body 10d of the tightening bolt 1d, and this wrench is rotated counterclockwise so that the bolt of the tightening bolt 1d. The main body 10d can be easily removed from the base together with the machine.

  According to the tightening bolt 1d, in addition to the same effects as those of the first embodiment, a pressure is applied to the upper surface of the washer 2d by the hexagon head 13d formed at the base end of the bolt body 10d. As a result, when the screw is screwed in, the incomplete end where the screw start part and the part where the screw thread does not meet is less affected by the friction between the screw surfaces and the seating surface friction. The friction between them works independently. And a machine can be firmly fixed to a foundation.

(Embodiment 6)
12A and 12B are explanatory views of a fastening bolt 1e according to Embodiment 6 of the present invention, in which FIG. 12A is a perspective view, FIG. 12B is a plan view, FIG. 12C is a side view, and FIG. It is a HH sectional view taken on the line. Detailed description of elements common to the first to fifth embodiments is omitted.

  As shown in FIG. 12, in the tightening bolt 1e of the sixth embodiment, a washer 2e with a recess 22e is provided instead of the washer 2d of the fifth embodiment. In the tightening bolt 1e according to the sixth embodiment, the hexagon head 13e applies pressure to the upper surface of the washer 2e.

  Hereinafter, a method of using the tightening bolt 1e will be described.

  First, a fastening bolt 1e is prepared in which a washer 2e is loosely screwed to the base end side of the bolt body 10e. By inserting a normal wrench (not shown) into the hexagon head 13e formed at the base end of the bolt body 10e of the tightening bolt 1e, and rotating the wrench clockwise, the tip of the bolt body 10e of the tightening bolt 1e. Screw the side into the base and fit the machine. When the bottom surface of the washer 2e touches the machine, the hexagon head 13e is further rotated clockwise with a wrench, thereby applying pressure to the top surface of the washer 2e. As a result, when the screw is screwed in, the incomplete end where the screw start part and the part where the screw thread does not meet is less affected by the friction between the screw surfaces and the seating surface friction. The friction between them works independently. And a machine can be firmly fixed to a foundation.

  When loosening, a normal wrench (not shown) is inserted into the hexagon head 13e formed at the base end of the bolt body 10e of the tightening bolt 1e, and the bolt of the tightening bolt 1e is rotated counterclockwise. The front end side of the main body 10e can be easily removed from the base together with the machine.

  According to the tightening bolt 1e, in addition to the same effects as those of the first embodiment, a pressure is applied to the upper surface of the washer 2e by the hexagon head 13e formed at the base end of the bolt body 10e. As a result, when the screw is screwed in, the incomplete end where the screw start part and the part where the screw thread does not meet is less affected by the friction between the screw surfaces and the seating surface friction. The friction between them works independently. And a machine can be firmly fixed to a foundation.

(Embodiment 7)
13A and 13B are explanatory views of a fastening bolt 1f according to Embodiment 7 of the present invention, in which FIG. 13A is a perspective view, FIG. 13B is a plan view, FIG. 13C is a side view, and FIG. It is the II sectional view taken on the line. Detailed description of elements common to the first to sixth embodiments is omitted.

  As shown in FIG. 13, in the tightening bolt 1f of the seventh embodiment, the hexagon head 13f is substantially folded around the periphery so that the longitudinal section thereof is an inverted mountain shape, and the base end side 11f of the bolt main body 10f is A pressure receiving portion 14f extending in parallel is formed. In the tightening bolt 1f according to the seventh embodiment, a preload is applied to the base end side 11f of the bolt main body 10f by screwing the washer 2f to the base end side 11f of the bolt main body 10f so that the bolt is fastened. Later, by slightly loosening the washer 2f, the preload can be released to the front end side 12f of the bolt body 10f. Note that a nut may be screwed in place of the washer 2f.

  By the way, when a conventional bolt is tightened, the seating surface friction increases. However, as the seating surface friction increases, it becomes difficult to continue tightening the bolt. The breakdown of the fastening force is about 50% bearing surface friction, 40% screw surface friction, and about 10% axial force. If the male screw 11f on the base end side is a reverse screw (hereinafter sometimes referred to as a left and right screw collectively) with respect to the male screw 12f on the distal end side of the bolt body 10f, the reverse screw attached to the bolt first. The washer can be tightened without moving the surface that touches the fastening partner (the seating surface is processed to prevent loosening, and the seating surface is not rubbed even if it has an uneven shape that increases the amount of friction.) Must not). In contrast to the conventional bolt that is tightened while rubbing the head of the washer or bolt and the fastening partner against the seating surface, the tightening bolt 1f of the seventh embodiment only causes the screw surface to rub, and the seating surface is in contact with the screw surface friction. It can be fastened.

  Further, since the seat surface friction starts to loosen, it does not contribute to the fastening force. Therefore, the bolt mainly focusing on the axial force has a larger fastening force. In addition, there are lubricating oils and greases applied to the screw threads and the seating surface so as to be stably fastened not depending on the seating surface friction, and mainly fastened by the axial force. However, even if lubricating oils and fats are applied to reduce the variation in friction, it is difficult to effectively apply lubricating oils and fats without excess or deficiency.

  In this regard, in the case of the right and left screws of the tightening bolt 1f of the seventh embodiment, an appropriate axial force is given by assembling the male screw 11f on the base end side of the bolt body 10f and the washer 2f of the reverse screw at the time of manufacture. be able to. As a result, stress is generated on the pressure surface and the bolt head seat surface. In this state, the bolt is fixed when the seat is touched with the fastening partner, and the reverse screw washer 2f is turned until the bolt is separated from the bolt, so that the stress of the included axial force is applied to the reverse screw washer. 2f, it can be applied to the front end 12f of the bolt body 10f in the fastening partner.

  That is, at the manufacturing stage, the assembly accuracy between the bolt body 10f and the reverse screw washer 2f is controlled, and if the axial force and preload are kept constant, the bolt is fixed until it comes into contact with the fastening partner, and the bolt is fixed. If the washer is rotated until it is separated, the reverse screw washer 2f is indented into the fastening partner by an amount corresponding to the preload.

  More precisely, the axial force varies depending on the strength of the reverse screw washer 2f, the head shape of the bolt body 10f, and the strength of the fastening partner. However, it is easy to manage since the preload equivalent at the time of manufacture can be visually applied as an axial force. Thus, the fastening bolt 1f of the seventh embodiment enables bolt fastening with an axial force that is difficult to visually confirm. In the conventional so-called torque method and angle method, the frictional force changes due to dust and surface roughness, and the axial force tends to become opaque. On the other hand, the tightening bolt 1f of the seventh embodiment is convenient because the axial force can be fixed at a constant value, although it depends on the accuracy during manufacture.

(Embodiment 8)
14A and 14B are explanatory views of a fastening bolt 1g according to an eighth embodiment of the present invention, in which FIG. 14A is a perspective view, FIG. 14B is a perspective view of a bolt body 15g and a washer 2g, and FIG. (D) is the JJ sectional view taken on the line of (c). Detailed description of elements common to those of the first to seventh embodiments is omitted.

  As shown in FIG. 14, in the tightening bolt 1g of the eighth embodiment, the bolt main body is a cap nut-shaped bolt main body (first bolt having a male screw 16g and a female screw hole 17g formed coaxially on the tip side. 15g, and a bolt body 10g in the form of a cut bolt (corresponding to the second bolt body) having a male screw 11g threaded into the female screw hole 17g on the base end side. The male screw 11g on the base end side of the bolt main body 10g is a reverse screw with respect to the male screw 16g on the front end side of the bolt main body 15g.

  In other words, the tightening bolt 1g according to the eighth embodiment takes advantage of the effect of the right and left screws that can be obtained simply by turning one of the components, and the outer side of the bolt body 15g and the bolt body 10g. The left screw is provided with a left screw washer (a left screw nut may be used) 2g, and can be locked by tightening the bolt body 15g.

  Further, in the tightening bolt 1g according to the eighth embodiment, the bolt main body 15g and the bolt main body 10g are deformed by a nylon resin or a spring in the female screw hole 17g of the bolt main body 15g so that the bolt main body 15g and the bolt main body 10g are not integrated. It is filled with things and it is crushed when locked. Note that the pitch of the male screw on the base end side of the bolt body 10g may be made fine without filling the female screw hole 17g of the bolt body 15g with nylon resin or a spring or the like. The shape of the female screw hole 17g of the main body 15g may be easily deformed, for example, a taper.

  In the tightening bolt 1g of the eighth embodiment, the bolt body 15g to be tightened does not touch the fastening partner, so that the influence of the seating surface friction is small, and it is difficult to loosen after the tightening. Moreover, since the commercial product can be used for the bolt main body 10g and the left screw washer 2g, it becomes inexpensive. Further, the bolt body 15g can be manufactured by simply cutting a left screw on the cap nut. Further, the bolt main body 10g screwed to the bolt main body 15g is also difficult to loosen because an effect equivalent to a stud bolt is obtained at the end. Further, if the bolt body 10g is abutted in the bolt body 15g, or if the bolt body 10g is tapered, the deformation at the time of tightening has the effect of increasing the screw surface friction. The hexagon head 19g of the bolt body 15g may be reduced to taper the left screw portion, or the base end side of the bolt body 10g may be tapered, or both may be tapered.

  As described above, in the tightening bolt 1g of the eighth embodiment, the bolt body includes the bolt body 15g in which the male screw 16g and the female screw hole 17g are coaxially formed on the distal end side, and the proximal end side of the bolt body 15g. And a bolt main body 10g formed with a male screw 11g that can be screwed into the female screw hole 17g. The male screw 11g on the base end side of the bolt main body 10g with respect to the male screw 16g on the tip end side of the bolt main body 15g. Therefore, in the state where both bolts are integrated, it can be said that it is a fastening bolt provided with a bolt body in which male screws are discontinuously formed from the distal end side to the proximal end side. Also, the bolt body 10g is not limited to a dimensioned bolt, and a left screw thread is cut on the outer side of the tip with a washer (or nut) as a counterpart of a normal bolt, with the base end being a hexagon and the base end being a hexagon. A lockable washer or the like can be obtained by stacking the left screw washer or the like (in the bolt body 15g of the tightening bolt 1g of the eighth embodiment, the right screw is a perforated left screw bolt that can be locked).

  In the first embodiment, the front end side of the bolt body 10 is an M6 right screw, the base end side is an M8 narrow left screw, and the pitch of both screws is 1 mm. As long as it is a reverse screw, for example, the front end side of the bolt body may be an M6 right screw, and the base end side may be an M6 narrow left screw. In that case, the base end side is configured by a normal left screw. It is convenient because it can.

  In the sixth embodiment, a normal washer having a screw is used. However, if the effect of increasing the seating surface friction by rotating the screw in the loosening direction is obtained, the taper screw of the lead corresponding to the reverse screw is used. It may be a washer with a lead.

1, 1a to 1g Clamping bolt 10, 10a to 10f Bolt body 10g Bolt body (corresponding to the second bolt body)
15g Bolt body (corresponds to the first bolt body)
11, 11a to 11g Proximal male screw 12, 12a to 12g Proximal male screw 13 Hexagonal hole 13c to 13g Hexagon head (corresponding to the head)
14f Pressure receiving portion 16g Male screw 17g Hole 18g Female screw 19g Hexagon head (corresponds to the head)
2, 2a to 2c Nut 2d, 2e to 2g Washer 20, 20a to 20g Through hole 21, 21a to 21g Female screw 22a, 22b Stepped portion 22e, 22f Recess 3 Machine 31 Through hole 4 Base 41 Screw hole 5 Hexagon wrench 6 Normal Wrench

Japanese Patent Laid-Open No. 9-280239 JP 2002-89533 A Japanese Utility Model Publication No. 6-80018

Claims (11)

  A tightening bolt having a bolt body in which male screws are discontinuously formed from the distal end side to the proximal end side, wherein the proximal end side is a reverse screw with respect to the distal end side of the bolt body. Tightening bolt to be used.   2. The fastening bolt according to claim 1, wherein the base end side has a larger diameter than the front end side of the bolt body.   3. The tightening bolt according to claim 1, wherein the base end side is eccentric with respect to the tip end side of the bolt body.   The fastening bolt according to any one of claims 1 to 3, wherein a hexagonal hole having a smaller diameter than the base end is formed at a base end of the bolt body.   4. The head according to claim 1, wherein a head having a diameter larger than that of the base end is provided at a base end of the bolt main body, and a hexagon head or a hexagon hole is formed in the head. Tightening bolt.   6. The pressure receiving portion extending substantially parallel to the base end side of the bolt main body is formed by substantially folding back the vicinity of the periphery of the head so that the longitudinal section has an inverted mountain shape. Tightening bolt.   The tightening according to any one of claims 1 to 6, further comprising a nut formed continuously from one end side to the other end side of a female screw that can be screwed to the base end side of the bolt body. Attached bolts.   The nut according to claim 7, wherein a stepped portion capable of receiving a discontinuous portion of the male screw between the proximal end side and the distal end side of the bolt body is formed on the one end side or the other end side. Attached bolts.   The fastening according to any one of claims 1 to 6, further comprising a washer in which a female screw capable of being screwed to a base end side of the bolt body is continuously formed from one end side to the other end side. Attached bolts.   The tightening bolt according to claim 9, wherein the washer has a recess formed on the one end side or the other end side.   The bolt body includes a first bolt body in which a male screw and a female screw hole are formed coaxially on a distal end side, and a second bolt body in which a male screw that can be screwed into the female screw hole is formed on a proximal end side. 2. The tightening bolt according to claim 1, wherein the male screw on the proximal end side of the second bolt body is a reverse screw with respect to the male screw on the distal end side of the first bolt body. .

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