JP3059901U - Fastener - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a fastener in which it is extremely difficult to loosen nuts and bolts artificially after tightening. A fastener (10) includes a bolt (12) and a nut (14).
And a washer 16 and a stopper 18 provided between the bolt 12 and the nut 14. An arcuate nut engaging recess 26 is formed on the bottom surface 14A of the nut 14 along the circumferential direction of the nut 14. The washer 16 and the stopper 18 are arranged between the nut 14 and the head 20 of the bolt 12. A bolt insertion hole 32 is formed in the flat portion 30 of the washer 16, and the male screw portion 22 of the bolt 12 is formed.
Is inserted. This bolt insertion hole 32
Notches 32A and 32B are formed on the inner peripheral surface of the notch to face each other.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a fastener used for fastening and fixing an object, and more particularly, to a fastener which is extremely difficult to loosen artificially after being once tightened.

[0002]

[Prior art]

 Fasteners consisting of bolts and nuts used for railway rails, connecting bolts for towers, connecting bolts for gas and oil pipelines, etc. are firmly tightened in terms of safety. For example, a case in which rails of a railway are fixed will be described with reference to FIG. 60. A rail 1 of a railway is provided on a base plate 3 placed on an upper surface of a sleeper 2. On this base plate 3, a rail stopper 4 having a substantially U-shape in side view for mounting the rail 1 by pressing the base 1 </ b> A of the rail 1 is mounted. An upper plate portion 5 and a lower plate portion 6 are formed in the rail stopper 4, a bolt insertion hole 5A is formed in the upper plate portion 5, and a bolt insertion hole 6A is formed in the lower plate portion 6, respectively. . The male screw portion 7A of the bolt 7 is inserted into the base plate 3, and the male screw portion 7A is inserted into the bolt insertion holes 5A and 6A of the upper plate portion 5 and the lower plate portion 6 of the rail stopper 4. The nuts 8 and 9 are tightened to firmly fix the rail 1. However, since the bolt 7 and the nuts 8 and 9 are conventionally known bolts 7 and nuts 8 and 9, the nuts 8 and 9 can be loosened even after being firmly tightened. If the nuts 8 and 9 are loosened, there is a possibility that a serious accident may be directly caused.

[0003]

[Problems to be solved by the invention]

 The present invention has been made in view of the above facts, and it is an object of the present invention to provide a fastener in which it is extremely difficult to artificially loosen nuts and bolts after tightening.

[0004]

[Means for Solving the Problems]

 The invention according to claim 1 includes a bolt, a nut into which a male screw portion of the bolt is screwed, a nut locking recess formed on the bottom surface of the nut, and an inclined surface formed in the nut locking recess. A locking wall formed at one end of the nut locking recess, a washer disposed between the head of the bolt and the nut, a bolt insertion hole formed through the washer, and the washer. A formed stopper engaging portion, a movement inhibiting portion formed on the washer for inhibiting movement of the washer, a stopper disposed between the nut and the washer, and a stopper formed on the stopper. The bolt insertion portion, which is formed at one end of the stopper, is housed in the nut locking recess, and locks with the locking wall surface only when the nut is rotated in a loosening direction. Prevent rotation And obliquely rising on the pin portion, characterized by comprising a, a bending pin portion to be engaged to the fastener engaging portion of the washers over is formed on the other end of the fasteners. The invention of claim 2 includes a bolt, a nut into which the male screw portion of the bolt is screwed, a nut locking recess formed on the bottom surface of the nut, and an inclined surface formed in the nut locking recess. A locking wall formed at one end of the nut locking recess, a washer disposed between the head of the bolt and the nut, a bolt insertion hole formed through the washer, and a bolt insertion hole. A locking projection claw that protrudes from the periphery of the hole and is received in the nut locking recess and locks with the locking wall surface to prevent rotation of the nut only when the nut is rotated in a loosening direction. And characterized in that: The invention according to claim 3 provides a bolt, a nut into which a male screw portion of the bolt is screwed, a nut locking groove formed in an inner peripheral surface of a female screw portion of the nut, and a nut. A first tapered portion formed between the locking groove and the bottom surface of the nut; a washer disposed between the head of the bolt and the nut; a bolt insertion hole formed through the washer; A locking projection, which is provided on the periphery of the bolt insertion hole of the washer and is accommodated in the nut locking groove, formed on the tip of the locking projection, and abuts on the first tapered portion; It is characterized by having a second tapered portion inserted into the nut locking groove, and a locking step formed on the locking projection and locking the nut locking groove. The invention of claim 4 includes a bolt, a nut into which the male screw portion of the bolt is screwed, a nut locking recess formed on the bottom surface of the nut, and an inclined surface formed in the nut locking recess. A locking wall formed at one end of the nut locking recess, a pressing member disposed between the head of the bolt and the nut and pressing an object to be fixed, and a bolt formed through the pressing member. An insertion hole, a stopper engaging portion formed in the pressing body, a stopper provided between the nut and the pressing body, a bolt inserting portion formed in the stopper, and the stopper An inclined rising pin portion that is formed at one end of the nut and is received in the nut locking recess and that locks with the locking wall surface to prevent rotation of the nut only when the nut is rotated in a loosening direction. The other end of the stopper is formed at A bent pin portion to be engaged in order bracket locking unit is characterized by comprising a. The invention according to claim 5 includes a bolt, a nut into which the male screw portion of the bolt is screwed, a nut locking recess formed on the bottom surface of the nut, and an inclined surface formed in the nut locking recess. A locking wall formed at one end of the nut locking recess, a pressing member disposed between the head of the bolt and the nut and pressing an object to be fixed, and a bolt formed through the pressing member. The nut which is protruded from the insertion hole and the periphery of the bolt insertion hole of the pressing body and is accommodated in the nut engagement recess and is engaged with the engagement wall only when the nut is rotated in a loosening direction. And a locking projection claw for preventing rotation of the shaft. The invention according to claim 6 provides a bolt, a nut into which a male screw portion of the bolt is screwed, a nut locking groove formed in an inner peripheral surface of a female screw portion of the nut, and a nut. A first tapered portion formed between the locking groove and the bottom surface of the nut; a pressing member disposed between the head of the bolt and the nut for pressing an object to be fixed; and a through-hole formed in the pressing member. A bolt insertion hole, a locking projection protruding from a periphery of the bolt insertion hole of the pressing body and housed in the nut locking groove, and a first projection formed at a tip of the locking projection. A second tapered portion that is inserted into the nut locking groove after contacting the tapered portion; and a locking step formed on the locking projection and locking the nut locking groove. It is characterized by: The invention of claim 7 provides a bolt, a bolt locking recess formed on the bottom surface of the head of the bolt, an inclined surface formed in the bolt locking recess, and one end of the bolt locking recess. A locking wall formed, a nut into which the male screw portion of the bolt is screwed, a washer disposed between the head of the bolt and the nut, and a bolt insertion hole formed through the washer. A stopper engaging portion formed on the washer, a movement inhibiting portion formed on the washer for inhibiting movement of the washer, a stopper disposed between the nut and the washer, Formed in one end of the stopper and received in the bolt locking recess, and locked to the locking wall only when the bolt is rotated in the loosening direction. Block the rotation of the bolt An inclined startup pin for and a bending pin portion to be engaged the formed at the other end of the fastener to the fastener engaging portion of the washer, to become a as a feature. The invention according to claim 8 is characterized in that a bolt, a bolt locking recess formed on the bottom surface of the head of the bolt, an inclined surface formed on the bolt locking recess, and one end of the bolt locking recess. A locking wall formed, a nut into which the male screw portion of the bolt is screwed, a washer disposed between the head of the bolt and the nut, and a bolt insertion hole formed through the washer. Only when the bolt protrudes from the periphery of the bolt insertion hole and is accommodated in the bolt retaining recess and is rotated in a direction to loosen the bolt, it engages with the retaining wall to prevent rotation of the bolt. And a stop projection claw portion. According to a ninth aspect of the present invention, a bolt, a bolt locking groove formed in a ring shape inside the head of the bolt, and the bolt locking groove and a bottom surface of the head of the bolt are formed. A first taper portion, a nut into which the male screw portion of the bolt is screwed, a washer disposed between the head of the bolt and the nut, a bolt insertion hole formed through the washer, and the washer. A locking projection projecting from the periphery of the bolt insertion hole and accommodated in the bolt locking groove; and a bolt formed at the tip of the locking projection and abutting on the first tapered portion. It is characterized in that it has a second tapered portion inserted into the stop groove portion, and a locking step portion formed on the locking projection portion and locking the nut locking groove portion. The invention according to claim 10 is a bolt, a bolt locking recess formed on the bottom surface of the head of the bolt, an inclined surface formed on the bolt locking recess, and one end of the bolt locking recess. A locking wall provided, a nut into which the male screw portion of the bolt is screwed, a pressing member disposed between the head of the bolt and the nut to press an object to be fixed, and a penetrating through the pressing member. A bolt insertion hole formed, a stopper engaging portion formed in the pressing body, a stopper disposed between the head of the bolt and the pressing body, and a stopper formed in the stopper. A bolt insertion portion, formed at one end of the stopper and housed in the bolt engaging recess, and is locked to the locking wall surface only when the bolt is rotated in a loosening direction to prevent rotation of the bolt. Inclined rising pin portion and the other end of the stopper. It is characterized by being obtained by chromatic and a bending pin portion to be engaged to the fastener engaging portion of the pressing member. The invention according to claim 11 is a bolt, a bolt locking recess formed on the bottom surface of the head of the bolt, an inclined surface formed on the bolt locking recess, and one end of the bolt locking recess. A locking wall provided, a nut into which the male screw portion of the bolt is screwed, a pressing member disposed between the head of the bolt and the nut to press an object to be fixed, and a penetrating through the pressing member. The formed bolt insertion hole and the locking wall surface protruding from the peripheral edge of the bolt insertion hole of the pressing body and being received in the nut locking recess and rotating only in a direction to loosen the nut. And a locking projection claw for locking and preventing rotation of the bolt. According to the twelfth aspect of the present invention, a bolt, a bolt engaging groove formed in a ring shape inside the head of the bolt, and the bolt engaging groove and a bottom surface of the head of the bolt are formed. A first taper portion, a nut into which the male screw portion of the bolt is screwed, a pressing member disposed between the head of the bolt and the nut for pressing an object to be fixed, and a penetrating member formed through the pressing member. A bolt insertion hole, a locking projection projecting from the periphery of the bolt insertion hole of the pressing body and housed in the bolt locking groove, A second taper portion that is inserted into the bolt locking groove after contacting the taper portion; and a locking step formed on the locking protrusion and locking with the bolt locking groove. It is characterized by becoming. The invention according to claim 13 is characterized in that a bolt, a nut into which a male screw portion of the bolt is screwed, a locking pin insertion hole formed in the bottom surface of the nut, and a nut and a nut are provided between the head and the nut. A washer, a bolt insertion hole formed through the washer, a locking pin receiving hole formed in the periphery of the bolt insertion hole of the washer, and the locking pin received in the locking pin receiving hole. A locking pin that can be inserted into the pin insertion hole, a spring that is provided in the locking pin receiving hole and urges the locking pin, and a movement blocking part that is formed in the washer and that blocks movement of the washer; It is characterized by having. The invention according to claim 14 is provided with a bolt, a nut into which the male screw portion of the bolt is screwed, a locking pin insertion hole formed in the bottom surface of the nut, and a nut disposed between the head and the nut. A pressing body for pressing the object to be fixed, a bolt insertion hole formed through the pressing body, a locking pin receiving hole formed in a peripheral portion of the bolt insertion hole of the pressing body, and a locking pin receiving hole. A locking pin housed in the hole and insertable into the locking pin insertion hole, and a spring provided in the locking pin housing hole to bias the locking pin. Features. The invention according to claim 15 is a bolt, a nut into which the male screw portion of the bolt is screwed, a locking pin receiving hole formed on the bottom surface of the nut, and a locking received in the locking pin receiving hole. A pin, a spring provided in the locking pin receiving hole to bias the locking pin, a washer disposed between a head of the bolt and a nut, and a bolt inserted through the washer. A hole, a locking pin insertion hole formed in a peripheral portion of a bolt insertion hole of the washer, into which the locking pin can be inserted, and a movement preventing portion formed in the washer to prevent movement of the washer; It is characterized by having. The invention according to claim 16 is a bolt, a nut into which a male screw portion of the bolt is screwed, a locking pin receiving hole formed on the bottom surface of the nut, and a locking received in the locking pin receiving hole. A pin, a spring provided in the locking pin receiving hole to bias the locking pin, a pressing body disposed between the head of the bolt and the nut for pressing a fixed object, and a pressing body And a locking pin insertion hole formed in the periphery of the bolt insertion hole of the pressing body and through which the locking pin can be inserted. The invention according to claim 17 is a bolt, a locking pin insertion hole formed in the bottom surface of the head of the bolt, a nut into which a male screw portion of the bolt is screwed, and a head and nut of the bolt. , A bolt insertion hole formed through the washer, a locking pin receiving hole formed in a peripheral portion of the bolt insertion hole of the washer, and a locking pin receiving hole. A locking pin that is housed in the locking pin insertion hole and inserted into the locking pin insertion hole, a spring that is provided in the locking pin housing hole and biases the locking pin, and a movement of the washer formed in the washer. And a movement blocking unit for blocking the movement. The invention according to claim 18 is a bolt, a locking pin insertion hole formed on the bottom surface of the head of the bolt, a nut into which a male screw portion of the bolt is screwed, and a head and nut of the bolt. A pressing member disposed between the pressing members to press the fixed object, a bolt insertion hole formed through the pressing member, and a locking pin receiving hole formed in a peripheral portion of the bolt insertion hole of the pressing member. A locking pin housed in the locking pin housing hole and inserted into the locking pin insertion hole, and a spring provided in the locking pin housing hole to bias the locking pin. It is characterized by becoming. According to the invention of claim 19, a bolt, a locking pin receiving hole formed in the bottom surface of the head of the bolt, a locking pin received in the locking pin receiving hole, and the locking pin receiving hole. A spring internally provided for urging the locking pin, a nut into which the male screw portion of the bolt is screwed, a washer disposed between the head of the bolt and the nut, and a penetrating through the washer. It is characterized by having a formed bolt insertion hole, and a locking pin insertion hole formed in a peripheral portion of the bolt insertion hole of the washer and capable of inserting the locking pin. According to a twentieth aspect of the present invention, there is provided a bolt, a locking pin receiving hole formed in the bottom surface of the head of the bolt, a locking pin received in the locking pin receiving hole, and a locking pin receiving hole. A spring internally provided for urging the locking pin, a nut into which a male screw portion of the bolt is screwed, and a pressing member disposed between the head of the bolt and the nut to press an object to be fixed. And a locking pin insertion hole formed in a peripheral portion of the bolt insertion hole of the pressing body and into which the locking pin can be inserted. The invention of claim 21 provides a nut bolt in which a nut portion and a bolt portion are continuously formed, a female screw portion formed through the nut bolt along the axial direction, and a male screw screwed into the female screw portion. Bolt, a conical locking portion formed in the middle of the nut bolt, a first taper portion and a locking surface formed on the locking conical portion, and a bolt portion of the nut bolt is screwed. A tightening cylinder for receiving the object to be tightened together with the nut portion of the nut bolt; and a locking conical portion formed in a ring shape on an inner peripheral surface of a female screw portion of the tightening cylinder. And a second tapered portion formed between the locking groove and one surface of the tightening cylinder and abutting on the first taper portion; Slit formed from one side of the cylinder toward the length of the tightening cylinder It is characterized by comprising a. The invention of claim 22 provides a nut bolt in which a nut portion and a bolt portion are continuously formed, a female screw portion penetratingly formed in the nut bolt along the axial direction, and a male screw screwing into the female screw portion. And a nut into which the bolt portion of the nut bolt is screwed and which tightens the object to be tightened together with the nut portion of the nut bolt. The invention according to claim 23 is a nut bolt having a nut portion and a bolt portion formed continuously, a female screw portion formed through the nut bolt along the axial direction, and a male screw screwed into the female screw portion. A bolt provided with a nut portion, a nut into which the bolt portion of the nut bolt is screwed and a nut to be tightened together with the nut portion of the nut bolt; a nut locking recess formed on the bottom surface of the nut; An inclined surface formed in the nut locking concave portion, a locking wall surface formed at one end of the nut locking concave portion, and a stopper provided between the bolt portion of the nut bolt and the nut. A bolt insertion portion formed in the stopper, the stopper wall formed only at one end of the stopper, accommodated in the nut retaining recess, and rotated in a direction to loosen the nut. And locked An inclined startup pin for preventing rotation of bets, is characterized by comprising a, a bending pin portion to be engaged with the object tightening is formed at the other end of the fasteners. The invention according to claim 24 is a fastener comprising a bolt and a nut into which a male screw portion of the bolt is screwed, wherein the outer periphery of the nut or the bolt head is formed by a known spanner or the like. It is characterized in that it is formed in a shape that cannot be rotated. The invention according to claim 25 is characterized in that a step is formed on the outer periphery of the nut or bolt head. The invention of claim 26 is characterized in that a groove is formed in the outer peripheral portion of the nut or bolt head. The invention according to claim 27 is a fastener comprising a bolt and a nut into which a male screw portion of the bolt is screwed. The outer periphery of the nut or the bolt head is formed by a known spanner or the like. It is characterized in that it is formed in a shape that cannot be rotated and a tool insertion hole is formed in the top surface of the nut or bolt head.

[0005]

[Embodiment of the invention]

 1 to 6 show a first embodiment of the fastener according to the present invention. In the first embodiment, a case will be described as an example where the rail 1 of a railway as a fixing object described in the description of the related art is fixed using a rail stopper 4 as a pressing body. As shown in FIG. 1, the fastener 10 according to the present invention includes a bolt 12 and a nut 14, a washer 16 and a fastener 18 disposed between the bolt 12 and the nut 14. . The bolt 12 has the same structure as a known bolt, and has a hexagonal head 20 having a male screw portion 22 protruding therefrom. The male screw portion 22 is formed with a right-hand thread over substantially the entire length, and is screwed into a female screw portion 24 formed on the nut 14 by turning the nut 14 in the direction of arrow A in FIG. I have. As shown in FIG. 4, four arc-shaped nut locking recesses 26 are formed on the bottom surface 14 </ b> A of the nut 14 along the circumferential direction of the nut 14. As shown in FIGS. 3 and 5, each of the nut locking recesses 26 has an inclined surface 26A. A vertical locking wall surface 26B is formed at one end of each of the nut locking concave portions 26. As shown in FIG. 1, the washer 16 and the stopper 18 are arranged between the nut 14 and the head 20 of the bolt 12. A bolt insertion hole 32 is formed in the flat portion 30 of the washer 16 so that the male screw portion 22 of the bolt 12 is inserted. Notch portions 32A and 32B are formed on the inner peripheral surface of the bolt insertion hole 32 so as to oppose to each other. In addition, on both sides of the flat portion 30, movement preventing bent portions 34A and 34B serving as means for preventing movement of the washer 16 are formed by being bent at right angles. As shown in FIG. 6, the movement preventing bent portions 34A and 34B are locked on both sides of the upper plate portion 5 of the rail stopper 4, and the washer 16 moves freely with respect to the rail stopper 4. I try not to. As shown in FIG. 1, the stopper 18 is formed by bending a wire-like body into a substantially C-shape in plan view, and has a bolt insertion portion 18A formed at the center. An inclined rising pin portion 36 is formed at one end of the stopper 18, and a bent pin portion 38 is formed at the other end by being bent at a right angle. The inclined rising pin portion 36 is formed to be inclined at substantially the same inclination angle as the inclined surface 26A of the nut engaging concave portion 26 of the nut 14, so that it is accommodated in the nut engaging concave portion 26, and the bent pin portion 38 is provided. Is adapted to enter the notch 32A or the notch 32B of the washer 16. Moreover, since the inclined rising pin 36 is raised in an inclined state, it corresponds to the inclined surface 26A of the nut locking recess 26 as shown in FIG. It comes into contact with the stop wall surface 26B. As shown in FIG. 1, a known rail stop 4 having a substantially U-shape in side view is disposed between the head 20 of the bolt 12 and the washer 16. The male screw portion 22 of the bolt 12 is inserted through bolt insertion holes 5A and 6A formed through the upper plate portion 5 and the lower plate portion 6 of the rail stopper 4, respectively. As shown in FIG. 2, the lower plate portion 6 of the rail stopper 4 fixes the rail 1 by directly pressing the base 1A of the rail 1.

Next, the operation of the first embodiment will be described. When the rail 1 of the railway is fixed via the rail stopper 4 with the fastener 10 according to the first embodiment, the rail stopper 4 is mounted from above the male screw portion 22 of the bolt 12 protruding from the base plate 3. Lower and insert the male screw portion 22 into the bolt through holes 5A, 6A of the rail stopper 4. The lower plate 5 of the rail stopper 4 is made to correspond to the base 1A of the rail 1. Then, the washer 16 is lowered from above the rail stopper 4, and the male screw portion 22 of the bolt 12 is inserted into the bolt insertion hole 32 of the washer 16, and the washer 16 is stacked on the rail stopper 4. At this time, the movement preventing bent portions 34A and 34B of the washer 16 sandwich the upper plate portion 5 of the rail stopper 4 between the movement preventing bent portions 34A and 34B, thereby connecting the movement preventing bent portions 34A and 34B of the washer 16 to the upper plate portion 5. To prevent the washer 16 from moving. Next, the stopper 18 is lowered from above the male screw portion 22 to insert the male screw portion 22 into the bolt insertion portion 18A of the fastener 18 and the bent pin portion 38 of the stopper 18 is cut out of the washer 16. Insert into the part 32A or the notch 32B. Then, the nut 14 is screwed into the male screw portion 22 and tightened by turning the nut 14 in the direction of arrow A in FIG. 1 with a known spanner (not shown). Then, the inclined rising pin portion 36 of the stopper 18 enters the nut locking concave portion 26 formed on the bottom surface 14A of the nut 14. At this time, the inclined rising pin portion 36 of the stopper 18 is accommodated in the nut engaging concave portion 26. However, when the nut 14 is tightened, the inclination direction of the inclined rising pin portion 36 is the inclination of the nut engaging concave portion 26. Since it coincides with the direction of inclination of the surface 26A, the nut 14 can be smoothly rotated in the direction in which the nut 14 is tightened regardless of the presence of the inclined rising pin portion 36. Further, by tightening the nut 14, the lower plate 6 of the rail stopper 4 presses the base 1A of the rail 1 and the rail 1 is fixed. When the nut 14 stops rotating any more, the tightening operation of the bolt 12 and the nut 14 is completed. In order to artificially loosen the tightening tool 10 thus tightened, if the nut 14 is rotated in a direction to loosen the nut 14 with a spanner or the like (the direction opposite to the arrow A in FIG. 1), the inclined rising pin of the stopper 18 is rotated. The portion 36 abuts on the locking wall surface 26B of the nut locking recess 26 of the nut 14. Further, since the bent pin portion 38 of the stopper 18 is inserted into the notch 32A or the notch 32B of the washer 16, the stopper 18 does not rotate while being fixed. For this reason, even if an attempt is made to loosen the nut 14, the nut 14 cannot prevent the nut 14 from rotating in the loosening direction, so that the nut 14 cannot be loosened. As a result, since the nut 14 cannot be loosened artificially, it is possible to reliably prevent a third party from loosening the rail 1 of the railway artificially. In addition, the fastener 10 prevents the nut 14 from being loosened due to vibration or temporal change, so that the number of regular inspections by inspection workers can be reduced, which is an advantage in terms of personnel and economy. Having. The fastener 10 of this embodiment also has the advantage that it is economical because the rail stopper 4 conventionally used for fixing the rail 1 of the railway is used as it is.

In the first embodiment, the notches 32A and 32B are formed on the inner peripheral surface of the bolt insertion hole 32 of the washer 16 so as to face the stoppers. The shape of the portion is not limited to the cutout portions 32A and 32B, and the shape is, of course, not limited as long as the bent pin portion 38 of the stopper 18 can be locked. In the first embodiment, the movement preventing bent portions 34A and 34B are provided on both sides of the flat portion 30 of the washer 16, but the movement preventing bent portions 34A and 34B are provided with the movement preventing bent portions 34A and 34B. Of course, only one of them may be formed. Instead of forming the movement inhibiting bent portions 34A and 34B on the flat portion 30 of the washer 16, as shown in FIG. 7, a saw blade-shaped projection 39A is formed on the bottom surface of the flat portion 30 of the washer 16. 8, or a pin insertion hole formed in the upper plate 5 of the rail stopper 4 by forming a pin 39B on the bottom surface of the flat portion 30 of the washer 16 as shown in FIG. By inserting the washer 16 into the 5B, the washer 16 may be prevented from moving freely.

FIGS. 9 and 10 show a fastener 40 according to a second embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 9, the fastener 40 of the second embodiment includes the bolt 12, the nut 14, and the washer 42. As shown in FIGS. 9 and 10, four notches 44 are radially formed at the periphery of the bolt insertion hole 32 of the washer 42, and the tip of the notch 44 extends in the circumferential direction. An arcuate slit 46 is formed, and four locking projection claws 48 are raised in an inclined state to project four. The locking projection claw portion 48 has an inclined portion 48A and a tip portion 48B (see FIG. 10). Further, the locking projection claw portion 48 is formed at substantially the same inclination angle as the inclined surface 26A of the nut locking concave portion 26. Therefore, when the nut 14 is tightened and the locking projection claw 48 is received in the nut locking recess 26 formed on the nut 14, the inclined portion 48 A of the locking projection claw 48 is The tip portion 48B corresponds to the locking wall surface 26B of the nut locking recess 26, corresponding to the inclined surface 26A. As a result, even if the nut 14 is to be loosened after the nut 14 is tightened, the distal end portion 48B of the locking projection claw portion 48 contacts the locking wall surface 26B and the nut 14 cannot be loosened. As a result, after the nut 14 is tightened, the nut 14 cannot be loosened artificially. The fastener 40 of the second embodiment does not require the fastener 18 as compared with the fastener 10 of the first embodiment, so that the number of parts can be reduced as compared with the fastener 10 of the first embodiment. Have a point. The other configuration and operation are the same as those of the fastener 10 of the first embodiment, and therefore, description thereof will be omitted.

FIGS. 11 and 12 show a fastener 50 of a third embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 11, the fastener 50 of the third embodiment includes a bolt 12, a nut 52, and a washer 54. As shown in FIG. 12, a nut locking groove 56 having a ring shape in a plan view is formed on the inner peripheral surface of the female screw portion 24 of the nut 52 along the circumferential direction. Between the nut locking groove 56 and the bottom surface 52A of the nut 52, a first tapered portion 58 having a smaller diameter as it approaches the nut locking groove 56 is formed. As shown in FIG. 11, three locking projections 60 are provided at equal intervals on the periphery of the bolt insertion hole 32 of the washer 54. A gap is formed between the locking projections 60. In addition, a second tapered portion 62 and a locking step 64 whose diameter decreases as approaching the distal end are integrally formed at the distal end of the locking projection 60. Therefore, when the nut 52 is tightened, the second tapered portion 62 of the locking projection 60 of the washer 54 comes into contact with the first tapered portion 58 of the nut 52 and is forcibly reduced by the first taper portion 58. Then, it enters the nut locking groove 56 of the nut 52. Then, the nut 52 is further tightened to release the contact between the second tapered portion 62 of the locking projection 60 and the first tapered portion 58 of the nut 52, and the second tapered portion 62 is brought into the nut locking groove 56. When completely inserted, the locking projection 60 of the washer 54 returns elastically and returns to its original shape. Therefore, even if the nut 52 is rotated in the loosening direction to loosen the nut 52 in this state, the locking step 64 of the locking projection 60 is locked in the nut locking groove 56, so that the locking projection 60 Cannot be pulled out from the nut locking groove 56, so that the nut 52 cannot be loosened artificially. The fastener 50 of the third embodiment has the advantage that the number of parts can be reduced as compared with the fastener 10 of the first embodiment because the fastener 18 of the fastener 10 of the first embodiment is not required. I do. In addition, other configurations and operations are the same as those of the fastener 10 of the first embodiment, and thus description thereof will be omitted.

As shown in FIG. 13, a cylindrical locking projection 66 is protruded from the periphery of the bolt insertion hole 32, and a second tapered portion 62 is formed at the tip of the locking projection 66. Then, a washer 69 in which four slits 68 are formed in the projection cylindrical body 66 and the second tapered portion 62 may be used instead of the washer 54.

FIG. 14 shows a fastener 70 according to a fourth embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 14, the fastening device 70 according to this embodiment includes a bolt 12, a nut 14, a fastener 18, and a rail stopper 72. Notch portions 32A and 32B are formed on the inner peripheral surface of the bolt insertion hole 5A of the upper plate portion 5 of the rail stopper 72 so as to oppose each other. Therefore, in this embodiment, the inclined rising pin portion 36 of the stopper 18 is accommodated in the nut engaging recess 26 of the nut 14, and the bent pin portion 38 of the stopper 18 is formed by the notch of the rail stopper 72. The portion 32A or the cutout portion 32B is inserted. The fastener 70 of this embodiment does not require the washer 16 as compared with the fastener 10 of the first embodiment, and thus has an advantage that the number of parts can be reduced. The other configuration and operation are the same as those of the fastener 10 of the first embodiment, and therefore, the description thereof is omitted.

FIGS. 15 and 16 show a fastener 74 of a fifth embodiment. Note that the same components as those in the first embodiment and the second embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 15, the fastener 74 according to this embodiment includes a bolt 12, a nut 14, and a rail stopper 76. As shown in FIG. 16, four cuts 44 are formed radially at the periphery of the bolt insertion hole 5 </ b> A of the upper plate 5 of the rail stopper 76. An arc-shaped slit 46 is formed along the direction, and four locking projection claws 48 are projected. The locking projection claw 48 has an inclined portion 48A and a tip portion 48B. Therefore, the fastener 74 of this embodiment has an advantage that the number of components can be reduced because the washer 16 and the fastener 18 are not required as compared with the fastener 10 of the first embodiment. The other configuration and operation are the same as those of the fasteners 10 and 40 of the first and second embodiments, and the description thereof will be omitted.

FIG. 17 shows a fastener 80 of a sixth embodiment. The same components as those in the first and third embodiments are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 17, the fastener 80 according to this embodiment includes a bolt 12, a nut 52, and a rail stopper 82. Three locking projections 60 are projected from the periphery of the bolt insertion hole 5A of the upper plate portion 5 of the rail stopper 82. Therefore, the fastener 80 of this embodiment has an advantage that the number of parts can be reduced because the washer 16 and the stopper 18 are not required as compared with the fastener 10 of the first embodiment. The other configuration and operation are the same as those of the fasteners 10 and 50 of the first and third embodiments, and thus the description thereof is omitted.

FIG. 18 shows a modification of the fastener 84 of the sixth embodiment. As shown in FIG. 18, a rail stopper 86 instead of the rail stopper 82 is shown. At the periphery of the bolt insertion hole 5 </ b> A of the rail stopper 86, a cylindrical locking projection cylinder 66 protrudes, and a second tapered portion 62 is formed at the tip of the locking projection cylinder 66. Also, four slits 68 are formed in the locking projection cylinder 66 and the second tapered portion 62 so that the second tapered portion 62 can be narrowed.

FIGS. 19 to 21 show a fastener 90 according to a seventh embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 19, the fastener 90 includes a bolt 92, a nut 94, a washer 16, and a fastener 18. This fastening tool 90 is different from the fastening tools of the first to sixth embodiments in that a nut 92 is fixed to the lower surface of the plate plate 3 (see FIG. 2) and a bolt 92 is screwed in from above the plate plate 3. It is of the type to be tightened. The fasteners up to the twelfth embodiment are of the type similar to the fasteners 90 of the seventh embodiment, in which a nut is fixed to the lower surface of the plate plate 3 and the bolt is screwed in from above the plate plate 3 and tightened. belongs to. As shown in FIG. 20, on the bottom surface 96A of the head portion 96 of the bolt 92, four arc-shaped bolt locking recesses 98 are formed along the circumferential direction around the male screw portion 97 of the bolt 92. . The locking recesses 98 have the same structure as the nut locking recesses 26, and are formed with inclined surfaces 98A. In addition, a vertical wall surface 98B is formed at one end of the bolt locking recess 98. The inclined surface 98A of the bolt engaging concave portion 98 is formed so as to have substantially the same inclination angle as that of the inclined rising pin portion 36 of the stopper 18. Therefore, when the bolt 92 is turned in the direction of arrow A in FIG. 19 and tightened, as shown in FIG. When turned in the direction indicated by the arrow A, the inclined rising pin portion 36 of the stopper 18 comes into contact with the locking wall surface 98B of the bolt locking recess 98 so that the bolt 92 cannot be loosened. The other configuration and operation are the same as those of the fastener 10 of the first embodiment, and therefore, description thereof will be omitted.

FIG. 22 shows a fastener 100 according to an eighth embodiment. The same components as those in the first, second, and seventh embodiments are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 22, the fastener 100 includes a bolt 92, a nut 94, and a washer 42. Four notches 44 are formed in the periphery of the bolt insertion hole 32 of the washer 42, and an arc-shaped slit 46 is formed at the tip of the notch 44 along the circumferential direction. There are four locking projection claws 48 to be accommodated in the projection. The other structure and operation are the same as those of the first, second, and seventh embodiments, and a description thereof will be omitted.

FIGS. 23 and 24 show a fastener 104 according to a ninth embodiment. The same components as those in the first and third embodiments are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIG. 23, the fastener 104 includes a bolt 106, a nut 94, and a washer 54. As shown in FIG. 24, an annular groove 112 is formed around the male screw 110 of the bolt 106 on the bottom surface 108A of the head 108 of the bolt 106. A bolt locking groove 56 is formed around the annular groove 112. A first tapered portion 58 is formed between the bolt locking groove 56 and the bottom surface 108A of the head 108 of the nut 106. The locking projection 56 of the washer 54 is housed and locked in the bolt locking groove 56. The other structure and operation are the same as those of the first and third embodiments, and the description thereof is omitted.

Further, it goes without saying that a washer 69 shown in FIG. 13 may be used instead of the washer 54 in the fastener 104 of the ninth embodiment.

FIG. 25 shows a fastener 114 of the tenth embodiment. The same components as those in the first and seventh embodiments are denoted by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 25, the fastener 114 includes a bolt 92, a nut 94, a fastener 18, and a rail stopper 72. The other structure and operation are the same as those of the first and seventh embodiments, so that the description thereof will be omitted.

FIG. 26 shows the fastener 116 of the eleventh embodiment. The same components as those in the first and fifth embodiments are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIG. 26, the fastener 116 includes a bolt 92, a nut 94, and a rail stopper 76. The other structure and operation are the same as those of the first and fifth embodiments, so that the description thereof will be omitted.

FIG. 27 shows a fastener 118 of the twelfth embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 27, the fastener 118 includes a bolt 106, a nut 94, and a rail stopper 82. The other structure and operation are the same as those of the first embodiment, and the description is omitted.

It is needless to say that a rail stopper 86 shown in FIG. 18 may be used instead of the rail stopper 82 in the fastener 118 of the twelfth embodiment.

FIGS. 28 to 32 show a fastener 120 of a thirteenth embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. The fasteners of the thirteenth to twentieth embodiments use locking pins. As shown in FIG. 28, the fastener 120 includes a bolt 12, a nut 122, and a washer 124. As shown in FIG. 29, a plurality of locking pin insertion holes 126 are formed in the bottom surface 122A of the nut 122 along the female screw portion 24. An inclined portion 127 is formed adjacent to the locking pin insertion hole 126. The inclined portion 127 is formed so as to be inclined deeper as it approaches the locking bin insertion hole 126. However, the inclined portion 127 is formed adjacent to the locking pin insertion hole 126 on the side corresponding to the locking pin 130 described later, ahead of the locking pin insertion hole 126. Further, as shown in FIG. 28, a locking pin housing hole 128 is formed in the periphery of the bolt insertion hole 32 of the washer 124. A locking pin 130 is housed in these locking pin receiving holes 128 so as to be able to protrude and retract, and can be inserted into the locking pin insertion hole 126. As shown in FIG. 32, a coil spring 132 is provided at the bottom of the locking pin housing hole 128 to urge the locking pin 130 upward. A ring body 134 is buried in the periphery of the bolt insertion hole 32 of the washer 124, and a stepped part 36 formed on the locking pin 130 comes into contact with the ring body 134 as shown in FIG. This prevents the locking pin 130 from dropping out of the locking pin receiving hole 128. Therefore, when the nut 122 is tightened to the bolt 12, the locking pin 130 provided on the washer 124 is inserted into the locking pin insertion hole 126 of the nut 122, so that the nut 122 is fixed. The locking pin insertion hole 126 is formed with an inclined portion 127 that inclines deeply as approaching the locking pin insertion hole 126, and the inclined portion 127 is formed when the nut 122 is rotated in the tightening direction. Since the locking pin 130 is formed at a position corresponding to the position before the locking pin insertion hole 126, the locking pin 130 can be smoothly inserted into the locking pin insertion hole 126. However, even if it is attempted to rotate the nut 122 in the loosening direction, the locking pin 130 comes into contact with the side surface of the locking pin insertion hole 126, so that the locking pin 130 is once inserted into the locking pin insertion hole 126. If it does, the nut 122 cannot be rotated in the loosening direction. Therefore, after the nut 122 is tightened, the nut 122 cannot be loosened even if the nut 122 is to be loosened. The other configuration and operation are the same as those of the first embodiment, and the description thereof is omitted.

FIG. 33 shows a fastener 140 according to a fourteenth embodiment. Note that the same components as those in the first and thirteenth embodiments are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 33, the fastener 140 includes a bolt 12, a nut 122, and a rail stopper 142. A locking pin housing hole 128 is formed in the periphery of the bolt insertion hole 5A of the rail stopper 142. The locking pins 130 are housed in the locking pin housing holes 128 so that they can be inserted into the locking pin insertion holes 126 formed in the nut 122. A coil spring 132 is provided inside the bottom of the locking pin housing hole 128 to urge the locking pin 130. A ring 134 is buried in the periphery of the bolt insertion hole 5A of the rail stopper 142, and the step 136 formed on the locking pin 130 is locked by abutting the ring 134. The pins 130 do not fall out of the locking pin receiving holes 128. Therefore, when the nut 122 is tightened to the bolt 12, the locking pin 130 of the rail stopper 142 is inserted into the locking pin insertion hole 126 of the nut 122. The other configuration and operation are the same as those of the first embodiment and the thirteenth embodiment, and the description thereof is omitted.

FIGS. 34 to 36 show a fastener 144 according to a fifteenth embodiment. Note that the same components as those in the first and thirteenth embodiments are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 34, the fastener 144 includes a bolt 12, a nut 146, and a washer 148. As shown in FIG. 35, a plurality of locking pin receiving holes 128 are formed in the bottom surface 146A of the nut 146 along the female screw portion 24. The locking pins 130 are stored in the locking pin holes 128. As shown in FIG. 36, a coil spring 132 is provided inside the bottom of the locking pin housing hole 128 to urge the locking pin 130 downward. A ring 134 is buried in the periphery of the bolt insertion hole 24 of the nut 146, and a step 136 formed on the locking pin 130 comes into contact with the ring 134 so that the locking pin 130 Are prevented from dropping out of the locking pin housing hole 128. Further, as shown in FIG. 34, a plurality of locking pin insertion holes 126 into which the locking pins 130 are inserted are formed in the periphery of the bolt insertion hole 32 of the washer 148. An inclined portion 127 is formed adjacent to the locking pin insertion hole 126. Accordingly, when the nut 146 is tightened to the bolt 12, the locking pin 130 provided to be able to protrude and retract from the nut 12 can be inserted into the locking pin insertion hole 126 provided in the washer 148. Therefore, after the nut 146 is tightened, the nut 146 cannot be loosened even if the nut 146 is to be loosened. The other configuration and operation are the same as those of the first embodiment and the thirteenth embodiment, and the description thereof is omitted.

FIG. 37 shows a fastener 150 of the sixteenth embodiment. The same components as those in the first, thirteenth, and fifteenth embodiments are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 37, the fastener 150 is composed of a bolt 12, a nut 146, and a bail 152. A plurality of locking pin receiving holes 128 are formed in the bottom surface 146A of the nut 146 along the female screw portion 24. Locking pins 130 are housed in these locking pin housing holes 128. A coil spring 132 is provided at the bottom of the locking pin receiving hole 128 to urge the locking pin 130 downward. A ring body 134 is buried in the periphery of the bolt insertion hole 24 of the nut 146. Further, a plurality of locking pin insertion holes 126 into which the locking pins 130 are inserted are formed in the periphery of the bolt insertion hole 5A of the rail stopper 152. An inclined portion 127 is formed adjacent to the locking pin insertion hole 126. Therefore, after the nut 146 is tightened, the nut 146 cannot be loosened even if the nut 146 is to be loosened. The other configurations and operations are the same as those of the first, thirteenth, and fifteenth embodiments, and thus description thereof will be omitted.

FIGS. 38 to 40 show a fastener 154 of the seventeenth embodiment. Note that the same components as those in the first and thirteenth embodiments are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 38, the fastener 154 includes a bolt 156, a nut 94, and a washer 124. As shown in FIG. 39, a locking pin insertion hole 126 is formed in the bottom surface 158A of the head 158 of the bolt 156. An inclined portion 127 is formed adjacent to the locking pin insertion hole 126. Locking pin receiving holes 128 are formed in the washer 124, and locking pins 130 are stored in the locking pin receiving holes 128. The locking pin 130 is urged by a coil spring 132 provided in the locking pin housing hole 128. The other configuration and operation are the same as those of the first, seventh, and thirteenth embodiments, and thus description thereof is omitted.

FIG. 41 shows a fastener 160 of the eighteenth embodiment. The same components as those in the first, thirteenth, and seventeenth embodiments are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 41, the fastener 160 includes a bolt 156, a nut 94, and a bail 162. A locking pin insertion hole 126 is formed in the bottom surface 158A of the head 158 of the bolt 156. An inclined portion 127 is formed adjacent to the locking pin insertion hole 126. Locking pin receiving holes 128 are formed around the bolt insertion hole 5A of the rail stopper 162, and locking pins 130 are stored in these locking pin receiving holes 128. The locking pin 130 is urged by a coil spring 132 provided in the locking pin housing hole 128. The other configuration and operation are the same as those of the first, seventh, thirteenth, and seventeenth embodiments, and thus description thereof is omitted.

FIGS. 42 and 43 show a fastener 164 of the nineteenth embodiment. The same components as those in the first, fifteenth, and seventeenth embodiments are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 42, the fastener 164 includes a bolt 166, a nut 94, and a washer 148. As shown in FIG. 43, a locking pin receiving hole 128 is formed in the bottom surface 168A of the head 168 of the bolt 166. Locking pins 130 are housed in these locking pin housing holes 128. The locking pin 130 is urged downward by a coil spring 132 provided in the locking pin housing hole 128. As shown in FIG. 42, a lock pin insertion hole 126 is formed in the washer 148 around the bolt insertion hole 32. An inclined portion 127 is formed adjacent to the locking pin insertion hole 126. The other configuration and operation are the same as those of the first, fifteenth, and seventeenth embodiments, and thus description thereof is omitted.

FIG. 44 shows a fastener 170 of the twentieth embodiment. The same components as those in the first, fifteenth, seventeenth, and nineteenth embodiments are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 44, the fastener 170 includes a bolt 166, a nut 94, and a rail stopper 172. A locking pin receiving hole 128 is formed in the bottom surface 168A of the head 168 of the bolt 166. Locking pins 130 are housed in these locking pin housing holes 128. The locking pin 130 is urged downward by a coil spring 132 provided in the locking pin housing hole 128. A locking pin insertion hole 126 is formed in the rail stopper 172 around the bolt insertion hole 5A. An inclined portion 127 is formed adjacent to the locking pin insertion hole 126. The other configuration and operation are the same as those of the first, fifteenth, seventeenth, and nineteenth embodiments, and thus description thereof will be omitted.

FIGS. 45 and 46 show a fastener 180 of the twenty-first embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. The fastener 180 of the twenty-first embodiment is different from the fasteners of the first to twentieth embodiments together with the fasteners of the twenty-second embodiment and the twenty-third embodiment with the plate 181A as an object to be fastened. This is for fastening the plate member 181B. These plate members 181A and 181B are plate members for fixing the rail 1. This fastening tool 180 is composed of a bolt 12, a nut bolt 182, and a fastening cylinder 184. As shown in FIG. 46, the head 20 of the bolt 12 is housed in the same hexagonal head housing hole 3A as the head 20 formed on the bottom surface of the base plate 3, so that the bolt 12 is free to move. Is set in advance so as not to rotate. As shown in FIGS. 45 and 46, a female screw hole 185 is formed in the nut bolt 182 in the axial direction. In this embodiment, a left screw is formed in the female screw hole 185 so that the bolt 12 having the male screw portion 22 of the left screw can be screwed therein. Further, the nut bolt 182 is integrally formed with a nut portion 186 and a bolt portion 188. A locking conical portion 190 is formed at an intermediate portion of the bolt portion 188. The locking conical portion 190 has a first tapered portion 190A and a locking surface 190B. The bolt portion 188 is formed with a right-hand thread which is a screw in a direction opposite to that of the male screw portion 22 of the bolt 12. A female screw portion 194 having a right-hand thread is penetrated through the tightening cylinder 184 so that a bolt portion 188 of the nut bolt 182 can be screwed therein. As shown in FIG. 46, a ring-shaped locking groove 196 is formed inside the tightening cylinder 184. A second tapered portion 198 is formed between the locking groove 196 and one surface 184A of the tightening cylinder 184. As shown in FIG. 45, four slits 199 are formed at equal intervals in the upper part of the tightening cylinder 184 up to the locking groove 196. As a result, the slit 199 is formed when the bolt portion 188 of the nut bolt 182 is screwed into the female thread portion 194 of the tightening cylinder 184 and the first tapered portion 190A comes into strong contact with the second tapered portion 198. The upper portion of the fastening cylinder 184 is in an expanded state, so that the locking conical portion 190 of the nut bolt 182 enters the locking groove 196 and can be locked. Accordingly, the fastener 180 is configured to clamp the plate members 181A and 181B between the clamp cylinder 184 and the nut portion 186 of the nut bolt 182. Moreover, even if the nut bolt 182 is to be removed, the bolt portion 188 of the nut bolt 182 and the female screw portion 194 of the tightening cylinder 184 and the male screw portion 22 of the bolt 12 and the female screw portion 185 of the nut bolt 182 are in opposite directions. Therefore, the nut bolt 182 cannot be removed, and the locking conical portion 190 of the nut bolt 182 locks with the locking groove 196 of the tightening cylinder 184, so that the nut bolt 182 cannot be removed.

FIG. 47 shows a fastener 200 of the twenty-second embodiment. Note that the same components as those in the first and twenty-first embodiments are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 47, the fastener 200 includes a bolt 12, a nut bolt 201, and a nut 202. The nut bolt 201 is different from the nut bolt 182 of the twenty-first embodiment in that the nut bolt 201 is not provided with the conical locking portion 190, but the other structure is the same as the nut bolt 182. The bolt 12 is also set in advance so that the head 20 is accommodated in the head accommodation hole 3A formed on the upper surface of the base plate 3 so that the bolt 12 does not rotate freely. Further, a female screw portion 203 of a right-hand thread is formed through the nut 202 so that the bolt portion 188 of the nut bolt 201 can be screwed therein. Therefore, even when the fastening tool 200 attempts to remove the nut bolt 201, the right screw 193 of the nut bolt 201, the female screw 203 of the nut 202, the male screw 22 of the bolt 12, and the female screw 185 of the nut bolt 201 are removed. Is in the opposite direction, so that the nut bolt 201 cannot be removed.

FIGS. 48 and 49 show a fastener 204 of the twenty-third embodiment. Note that the same components as those in the first embodiment and the twenty-second embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 48, the fastener 204 includes a bolt 12, a nut bolt 201, a nut 14, and a fastener 18. A nut engaging recess 26 is formed on the bottom surface 14A of the nut 14. The nut engaging concave portion 26 has an inclined surface 26A. A locking wall surface 26B is formed at one end of the nut locking recess 26. When the plate member 181A and the plate member 181B are fastened in a state of being overlapped by using the fastener 204, the bottom surface 14A of the nut 14 is turned up, and then the stopper 18 is turned upside down. The upper pin portion 36 is housed in the nut locking recess 26 of the nut 14. Then, the male screw part 22 of the bolt 12 is inserted into the female screw part 24 of the nut 14. Next, by lowering the plate members 181A and 181B from above, the male screw portions 22 of the bolts 12 are inserted into the bolt insertion holes 181C of the plate member 181A and the bolt insertion holes 181D of the plate member 181B. At this time, the bent pin portion 38 of the stopper 18 is inserted into a hole 181E (see FIG. 49) formed in the plate member 181B in advance. Then, when the nut bolt 201 is lowered from above and the nut bolt 201 is turned, the male screw portion 22 of the bolt 12 is screwed with the female screw portion 185 of the nut bolt 201, and the plate member 181A and the plate member 181B are tightened in an overlapping state. Can be In this state, even if the nut bolt 201 is loosened, the stopper 18 prevents the nut bolt 201 from rotating in the loosening direction. In addition, even if the nut bolt 201 is loosened, the female screw 24 of the nut 14, the bolt 188 of the nut bolt 201, the male screw 22 of the bolt 12, and the female screw 185 of the nut bolt 201 are in the opposite direction. The nut bolt 201 formed with the groove cannot be loosened artificially.

FIG. 50 shows a fastener 220 of the twenty-fourth embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. Note that the fasteners of the twenty-fourth to twenty-sixth embodiments are known fasteners in which the shape of the nut or bolt head is changed in known bolts and nuts. As shown in FIG. 50, the fastener 220 includes a bolt 12 and a nut 222. Vertical step portions 224A and 224B are formed on the outer peripheral portion of the nut 222 at opposing positions. For this reason, with a known spanner, the nut 222 screwed with the bolt 12 cannot be tightened or loosened. Therefore, the nut 222 cannot be loosened without a special tool for exclusive use, so that the nut 222 can be prevented from being artificially loosened by a third party.

FIG. 51 shows a nut 226 used in a modification of the fastener 220 of the twenty-fourth embodiment. As shown in FIG. 51, the nut 226 is formed in a conical shape, and steps 224A and 224B are formed on the outer periphery of the nut 226.

In the twenty-fourth embodiment, the vertical steps 224A and 224B are formed on the outer periphery of the nut 222 so as to face each other. However, the steps need not be formed so as to face each other. It is needless to say that at least one piece is formed. In the fastener 220 of the twenty-fourth embodiment, the head 20 of the bolt 12 may be shaped like the nuts 222 and 226 described above.

FIG. 52 shows a fastener 227 of the twenty-fifth embodiment. As shown in FIG. 52, a nut 228 used for the fastener 227 is formed in a conical shape, and three inverted triangular notched grooves 228A are formed on the outer periphery of the nut 228. Therefore, the nut 228 cannot be loosened or tightened unless a special tool dedicated to the nut 228 is used.

FIG. 53 shows a nut 230 used in a modification of the fastener 227 of the twenty-fifth embodiment. As shown in FIG. 53, the nut 230 is formed in a conical shape, and three vertical notched grooves 230A are formed on the outer periphery of the nut 230. Therefore, the nut 230 cannot be loosened or tightened unless a special tool corresponding to the nut 230 is used.

FIG. 54 shows a nut 232 used in a modification of the fastener 227 of the twenty-fifth embodiment. As shown in FIG. 54, the nut 232 is formed in a conical shape, and a plurality of concave grooves 232A are formed on the outer periphery of the nut 232 along the outer periphery. Therefore, the nut 232 cannot be loosened or tightened unless a special special tool corresponding to the nut 232 is used.

In the twenty-fifth embodiment, the triangular notch groove 228A, the vertical notch groove 230A, and the concave groove 232A having an inverted triangular shape are shown. However, the shape of the groove is not limited to these. Needless to say, it is sufficient if the number is equal to or more than the number. In the fastener 227 of the twenty-fifth embodiment, the head 20 of the bolt 12 may be shaped like the nuts 228, 230, and 232.

FIGS. 55 and 56 show a fastener 234 of the twenty-sixth embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIGS. 55 and 56, the nut 236 is formed in a disk shape, and tool insertion holes 238A and 238B into which four insertion portions of a special tool (not shown) are inserted in the top surface 236A of the nut 236. , 238C, 238D are formed. The tool insertion holes 238A, 238B, 238C, and 238D are formed at equal intervals between the tool insertion holes 238A and 238B, and the tool insertion holes 238A and 238D are formed at equal intervals. By forming the special tool close to the insertion hole 238D, it becomes more difficult to manufacture the special tool. The nut 236 can be tightened or loosened by inserting four insertion portions of the special tool (not shown) into the tool insertion holes 238A, 238B, 238C, and 238D of the nut 236. Has become. Therefore, the nut 236 screwed with the bolt 12 cannot be loosened with a known spanner. Therefore, when the nut 236 is tightened or loosened, the nut 236 cannot be loosened unless a special tool is provided. Therefore, it is possible to prevent a third party from artificially loosening the nut 236. it can.

FIGS. 57 to 59 show a nut 240 used in a modification of the fastener 234 of the twenty-sixth embodiment. As shown in FIGS. 57 and 58, on the top surface 240A of the nut 240, oval holes 242A, 242B, 242C, and 242D are formed as tool insertion holes into which four insertion portions of a special tool are inserted. Have been. Further, the oblong hole 242A and the oblong hole 242C are both formed at positions near the oblong hole 242D. Moreover, as shown in FIG. 59, the bottom surfaces of the oblong holes 242A, 242B, 242C, 242D are formed in an arc shape, making it more difficult for a third party to manufacture a special tool for exclusive use.

Although the nuts 236 and 240 are formed in a disk shape in the twenty-sixth embodiment, the present invention is not limited to this shape. Further, the shape and number of the tool insertion holes formed in the top surfaces 236A and 240A of the nuts 236 and 240 are not limited. In the fastener 234 of the twenty-sixth embodiment, the head 20 of the bolt 12 may be shaped like the nuts 236 and 240 described above.

In the embodiment, the case where the rail 1 of the railway is fixed has been described as an example. However, the application is not limited to this, and something other than the rail 1 may be fixed or tightened. Of course.

[0044]

[Effect of the invention]

 As described above, the fasteners of claims 1 to 23 according to the present invention cannot be loosened once tightened, so that accidents caused by artificially loosening the fasteners can be prevented. It has an excellent effect of being able to. In addition, since nuts and bolts are prevented from loosening due to vibration and changes over time, periodic inspections of fasteners can be reduced, and there is an excellent effect of being economical. The fasteners of claims 24 to 27 according to the present invention cannot be loosened without using a special tool specially, so that an excellent effect that an accident or the like caused by loosening the fasteners can be prevented. Having.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fastener according to a first embodiment.

FIG. 2 is a side view showing a state where the fastener of the first embodiment is fixed.

FIG. 3 is a partial longitudinal sectional view of the fastener of the first embodiment.

FIG. 4 is a bottom view of the nut of the fastener of the first embodiment.

FIG. 5 is a schematic development view of a nut of the fastener of the first embodiment.

FIG. 6 is a perspective view showing an intermediate state of a mounting state of the fastener of the first embodiment.

FIG. 7 is a side view showing another modification of the washer of the fastener of the first embodiment.

FIG. 8 is a side view showing another modification of the washer of the fastener of the first embodiment.

FIG. 9 is an exploded perspective view of the fastener of the second embodiment.

FIG. 10 is a plan view of a washer of the fastener according to the second embodiment.

FIG. 11 is an exploded perspective view of the fastener of the third embodiment.

FIG. 12 is a longitudinal sectional view of a nut and a washer of the fastener according to the third embodiment.

FIG. 13 is a perspective view of a washer showing a modification of the fastener of the third embodiment.

FIG. 14 is an exploded perspective view of the fastener of the fourth embodiment.

FIG. 15 is an exploded perspective view of the fastener of the fifth embodiment.

FIG. 16 is a plan view of a rail stopper spring body of the fastener according to the fifth embodiment.

FIG. 17 is an exploded perspective view of the fastener of the sixth embodiment.

FIG. 18 is an exploded perspective view of a modification of the fastener of the sixth embodiment.

FIG. 19 is an exploded perspective view of the fastener of the seventh embodiment.

FIG. 20 is a perspective view of a bolt of the fastener according to the seventh embodiment.

FIG. 21 is a partial longitudinal sectional view of a fastener according to a seventh embodiment.

FIG. 22 is an exploded perspective view of the fastener of the eighth embodiment.

FIG. 23 is an exploded perspective view of the fastener of the ninth embodiment.

FIG. 24 is a partial longitudinal sectional view of the fastener of the ninth embodiment.

FIG. 25 is an exploded perspective view of the fastener of the tenth embodiment.

FIG. 26 is an exploded perspective view of the fastener of the eleventh embodiment.

FIG. 27 is an exploded perspective view of the fastener of the twelfth embodiment.

FIG. 28 is an exploded perspective view of the fastener of the thirteenth embodiment.

FIG. 29 is a bottom view of the nut of the fastener of the thirteenth embodiment.

FIG. 30 is a plan view of a washer of the fastener of the thirteenth embodiment.

FIG. 31 is an enlarged perspective view of the vicinity of a locking pin of the fastener of the thirteenth embodiment.

FIG. 32 is a partially enlarged sectional view of the fastener of the thirteenth embodiment.

FIG. 33 is an exploded perspective view of the fastener of the fourteenth embodiment.

FIG. 34 is an exploded perspective view of the fastener of the fifteenth embodiment.

FIG. 35 is a bottom view of the nut of the fastener of the fifteenth embodiment.

FIG. 36 is a partially enlarged sectional view of the fastener of the fifteenth embodiment.

FIG. 37 is an exploded perspective view of the fastener of the sixteenth embodiment.

FIG. 38 is an exploded perspective view of the fastener of the seventeenth embodiment.

FIG. 39 is a bottom view of the bolt of the fastener of the seventeenth embodiment.

FIG. 40 is a partially enlarged cross-sectional view of the fastener of the seventeenth embodiment.

FIG. 41 is an exploded perspective view of the fastener of the eighteenth embodiment.

FIG. 42 is an exploded perspective view of the fastener of the nineteenth embodiment.

FIG. 43 is a partially enlarged longitudinal sectional view of the fastener of the nineteenth embodiment.

FIG. 44 is an exploded perspective view of the fastener of the twentieth embodiment.

FIG. 45 is an exploded perspective view of the fastener of the twenty-first embodiment.

FIG. 46 is a longitudinal sectional view of the fastener of the twenty-first embodiment.

FIG. 47 is a longitudinal sectional view of the fastener of the twenty-second embodiment.

FIG. 48 is an exploded perspective view of the fastener of the twenty-third embodiment.

FIG. 49 is a longitudinal sectional view of the fastener of the twenty-third embodiment.

FIG. 50 is an exploded perspective view of a fastener of the twenty-fourth embodiment.

FIG. 51 is a perspective view of a nut as a modification of the fastener of the twenty-fourth embodiment.

FIG. 52 is an exploded perspective view of a fastener of the twenty-fifth embodiment.

FIG. 53 is a perspective view of a nut as a modification of the fastener of the twenty-fifth embodiment.

FIG. 54 is a perspective view of a nut as a modification of the fastener of the twenty-fifth embodiment.

FIG. 55 is an exploded perspective view of the fastener of the twenty-sixth embodiment.

FIG. 56 is a plan view of a nut of the fastener of the twenty-sixth embodiment.

FIG. 57 is a perspective view of a nut as a modification of the fastener of the twenty-sixth embodiment.

FIG. 58 is a plan view of a nut as a modification of the fastener of the twenty-sixth embodiment.

FIG. 59 is a partial longitudinal sectional view of a nut as a modification of the fastener of the twenty-sixth embodiment.

FIG. 60 is a side view showing a use state of a conventional fastener.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Tightening tool 12 ... Bolt 14 ... Nut 16 ... Washer 18 ... Stopper 26 ... Nut locking recessed part 26A .. Inclination surface 26B ... Locking wall surface 32 ...・ Bolt insertion hole 32A ・ ・ Notch 32B ・ ・ Notch 34A ・ ・ Movement-prevention bent part 34B ・ ・ Movement-prevention bent part 36 ・ ・ ・ Incline rising pin part 38 ・ ・ ・ Bend pin part

Claims (27)

[Utility model registration claims] 1. A bolt, a nut into which a male screw portion of the bolt is screwed, a nut engaging recess formed on a bottom surface of the nut, and an inclined surface formed on the nut engaging recess.
A locking wall formed at one end of the nut locking recess,
A washer provided between the head of the bolt and the nut, a bolt insertion hole formed through the washer,
A stopper engaging portion formed on the washer, a movement inhibiting portion formed on the washer to inhibit movement of the washer, a stopper disposed between the nut and the washer, The formed bolt insertion portion and the nut which is formed at one end of the stopper and is received in the nut locking recess and locked to the locking wall surface only when the nut is rotated in a loosening direction. It has an inclined rising pin portion for preventing rotation, and a bent pin portion formed at the other end of the stopper and engaged with a stopper engaging portion of the washer. Fastener. 2. A bolt, a nut into which a male screw portion of the bolt is screwed, a nut locking recess formed on a bottom surface of the nut, and an inclined surface formed on the nut locking recess.
A locking wall formed at one end of the nut locking recess,
A washer provided between the head of the bolt and the nut, a bolt insertion hole formed through the washer,
A lock that protrudes from the periphery of the bolt insertion hole and is received in the nut lock recess and locks with the lock wall surface only when the nut is rotated in a loosening direction to prevent rotation of the nut. And a projection claw. 3. A bolt, a nut into which a male screw portion of the bolt is screwed, a nut locking groove formed in a ring shape on an inner peripheral surface of a female screw portion of the nut, and the nut locking groove. A first tapered portion formed between the bottom surface of the nut,
A washer provided between the head of the bolt and the nut, a bolt insertion hole formed through the washer,
A locking projection projecting from a periphery of a bolt insertion hole of the washer and housed in the nut locking groove; and a nut formed at a tip of the locking projection and abutting on the first tapered portion. A fastener comprising: a second tapered portion inserted into a locking groove; and a locking step formed on the locking projection and locking the nut locking groove. 4. A bolt, a nut into which a male screw portion of the bolt is screwed, a nut engaging recess formed on a bottom surface of the nut, and an inclined surface formed on the nut engaging recess.
A locking wall formed at one end of the nut locking recess,
A pressing body disposed between the head of the bolt and the nut to press the fixed object, a bolt insertion hole formed through the pressing body, and a fastener engaging portion formed in the pressing body; A stopper disposed between the nut and the pressing body, a bolt insertion portion formed in the stopper, and a nut formed in one end of the stopper and housed in the nut locking recess and the nut An inclined rising pin portion which is locked to the locking wall surface only when rotated in a loosening direction to prevent rotation of the nut; and a stopper locking portion of the pressing body formed at the other end of the stopper. And a bent pin portion locked to the portion. 5. A bolt, a nut into which a male screw portion of the bolt is screwed, a nut engaging recess formed on a bottom surface of the nut, and an inclined surface formed on the nut engaging recess.
A locking wall formed at one end of the nut locking recess,
A pressing member disposed between the head and the nut of the bolt to press the fixed object, a bolt insertion hole formed through the pressing member, and a protrusion protruding from a peripheral edge of the bolt insertion hole of the pressing member. A locking projection claw that is housed in the nut locking recess and locks with the locking wall surface only when the nut is rotated in a loosening direction to prevent rotation of the nut. A fastener. 6. A bolt, a nut into which a male screw portion of the bolt is screwed, a nut locking groove formed in a ring shape on an inner peripheral surface of a female screw portion of the nut, and a nut locking groove. A first tapered portion formed between the bottom surface of the nut,
A pressing member disposed between the head and the nut of the bolt to press the fixed object, a bolt insertion hole formed through the pressing member, and a protrusion protruding from a peripheral edge of the bolt insertion hole of the pressing member. A locking projection accommodated in the nut locking groove,
A second tapered portion formed at the tip of the locking projection and inserted into the nut locking groove after contacting the first tapered portion; and a second tapered portion formed on the locking projection and associated with the nut locking groove. And a locking step for stopping. 7. A bolt, a bolt locking recess formed on the bottom surface of the head of the bolt, an inclined surface formed on the bolt locking recess, and one end of the bolt locking recess. A locking wall, a nut into which the male screw portion of the bolt is screwed, a washer disposed between the head of the bolt and the nut, a bolt insertion hole formed through the washer, and the washer. A formed fastener engaging portion,
A movement preventing portion formed on the washer to prevent movement of the washer, a stopper provided between the nut and the washer, a bolt insertion portion formed on the stopper, and one end of the stopper An inclined rising pin portion that is received in the bolt locking recess and is locked to the locking wall surface only when the bolt is rotated in a loosening direction to prevent rotation of the bolt; A bending pin formed at the other end of the metal fitting and locked by the metal fitting locking part of the washer. 8. A bolt, a bolt locking recess formed on the bottom surface of the head of the bolt, an inclined surface formed on the bolt locking recess, and one end of the bolt locking recess. A locking wall, a nut into which the male screw portion of the bolt is screwed, a washer disposed between the head of the bolt and the nut, a bolt insertion hole formed through the washer, and a bolt insertion hole. A locking claw portion that protrudes from the periphery of the hole and is received in the bolt locking recess and locks with the locking wall surface only when the bolt is rotated in a loosening direction to prevent rotation of the bolt. And a fastener. 9. A bolt, a bolt locking groove formed in a ring shape inside the head of the bolt, and a first taper formed between the bolt locking groove and a bottom surface of the head of the bolt. Part, a nut into which the male screw part of the bolt is screwed,
A washer provided between the head of the bolt and the nut, a bolt insertion hole formed through the washer,
A locking projection projecting from a peripheral edge of a bolt insertion hole of the washer and accommodated in the bolt locking groove; and a bolt formed at a tip of the locking projection and abutting on the first tapered portion. A fastener comprising: a second tapered portion inserted into a locking groove; and a locking step formed on the locking projection and locking the nut locking groove. 10. A bolt, a bolt locking recess formed on the bottom surface of the head of the bolt, an inclined surface formed on the bolt locking recess, and one end of the bolt locking recess. A locking wall, a nut into which a male screw portion of the bolt is screwed, a pressing member disposed between the head of the bolt and the nut to press an object to be fixed, and a bolt formed through the pressing member An insertion hole, a fastener engaging portion formed in the pressing body, a fastener disposed between the head of the bolt and the pressing body, and a bolt inserting portion formed in the fastener. An inclined rising pin that is formed at one end of the stopper, is received in the bolt locking recess, and locks with the locking wall surface only when the bolt is rotated in a loosening direction to prevent rotation of the bolt. Part and the pressing body formed at the other end of the stopper. And a bent pin portion to be locked to the stopper locking portion. 11. A bolt, a bolt locking recess formed on the bottom surface of the head of the bolt, an inclined surface formed on the bolt locking recess, and one end of the bolt locking recess. A locking wall, a nut into which a male screw portion of the bolt is screwed, a pressing member disposed between the head of the bolt and the nut to press an object to be fixed, and a bolt formed through the pressing member An insertion hole and a bolt which protrudes from the periphery of the bolt insertion hole of the pressing body, is received in the nut engagement recess, and engages with the engagement wall surface only when the nut is rotated in a loosening direction. And a locking projection claw for preventing rotation of the fastener. 12. A bolt, a bolt locking groove formed in a ring shape inside the head of the bolt, and a first taper formed between the bolt locking groove and the bottom surface of the head of the bolt. Part, a nut into which the male screw part of the bolt is screwed, a pressing body disposed between the head of the bolt and the nut to press an object to be fixed, and a bolt insertion hole formed through the pressing body. A locking projection projecting from a periphery of a bolt insertion hole of the pressing body and housed in the bolt locking groove, and being formed at a tip of the locking projection and abutting on the first tapered portion. A second tapered portion inserted into the bolt locking groove after the locking, and a locking step formed on the locking projection and locking the bolt locking groove. Attachment. 13. A bolt, a nut into which a male screw portion of the bolt is screwed, a locking pin insertion hole formed in a bottom surface of the nut, and a bolt disposed between the head and the nut. A washer, a bolt insertion hole formed through the washer, a locking pin receiving hole formed in a peripheral portion of the bolt insertion hole of the washer, and a locking pin insertion received in the locking pin receiving hole. A locking pin that can be inserted into the hole,
A spring provided in the locking pin receiving hole to bias the locking pin; and a movement preventing portion formed on the washer to prevent movement of the washer. Attachment. 14. A bolt, a nut into which a male screw portion of the bolt is screwed, a locking pin insertion hole formed in a bottom surface of the nut, and a bolt disposed between the head and the nut. A pressing body for pressing an object to be fixed, a bolt insertion hole formed through the pressing body, a locking pin receiving hole formed on a peripheral portion of the bolt insertion hole of the pressing body, and a locking pin receiving hole. A locking pin which is housed and can be inserted into the locking pin insertion hole, and a spring which is provided in the locking pin housing hole and biases the locking pin. Attachment. 15. A bolt, a nut into which a male screw portion of the bolt is screwed, a locking pin receiving hole formed in a bottom surface of the nut, a locking pin received in the locking pin receiving hole, A spring provided in the locking pin receiving hole to bias the locking pin, a washer disposed between the head of the bolt and a nut, and a bolt insertion hole formed through the washer. A locking pin insertion hole formed in a peripheral portion of the bolt insertion hole of the washer and into which the locking pin can be inserted, and a movement preventing portion formed in the washer to prevent movement of the washer. A fastener comprising: 16. A bolt, a nut into which a male screw portion of the bolt is screwed, a locking pin receiving hole formed in a bottom surface of the nut, a locking pin received in the locking pin receiving hole, A spring provided in the locking pin receiving hole for urging the locking pin, a pressing member disposed between the head of the bolt and the nut for pressing an object to be fixed, and a penetrating through the pressing member. A fastener comprising: a formed bolt insertion hole; and a locking pin insertion hole formed in a peripheral portion of the bolt insertion hole of the pressing body and into which the locking pin can be inserted. . 17. A bolt, a locking pin insertion hole formed in the bottom surface of the head of the bolt, a nut into which a male screw portion of the bolt is screwed, and a nut disposed between the head and the nut of the bolt. A washer to be provided; a bolt insertion hole formed through the washer; a locking pin receiving hole formed in a peripheral portion of the bolt insertion hole of the washer; and a locking pin received in the locking pin receiving hole. A locking pin inserted into the locking pin insertion hole, a spring provided in the locking pin receiving hole to bias the locking pin, and a movement preventing portion formed on the washer to prevent movement of the washer. And a fastener comprising: 18. A bolt, a locking pin insertion hole formed in the bottom surface of the head of the bolt, a nut into which a male screw portion of the bolt is screwed, and a nut disposed between the head and the nut of the bolt. A pressing body provided for pressing an object to be fixed, a bolt insertion hole formed through the pressing body, a locking pin receiving hole formed in a peripheral portion of the bolt insertion hole of the pressing body, and the locking pin. A locking pin that is housed in the housing hole and is inserted into the locking pin insertion hole; and a spring that is provided in the locking pin housing hole and biases the locking pin. And fasteners. 19. A bolt, a locking pin receiving hole formed in the bottom surface of the head of the bolt, a locking pin received in the locking pin receiving hole, and a bolt provided in the locking pin receiving hole. A spring for urging the locking pin, a nut into which a male screw portion of the bolt is screwed, a washer disposed between the head of the bolt and the nut, and a bolt formed through the washer. A fastener comprising: an insertion hole; and a locking pin insertion hole formed in a peripheral portion of the bolt insertion hole of the washer and into which the locking pin can be inserted. 20. A bolt, a locking pin receiving hole formed in the bottom surface of the head of the bolt, a locking pin received in the locking pin receiving hole, and a bolt provided in the locking pin receiving hole. A spring for urging the locking pin, a nut into which the male screw portion of the bolt is screwed, a pressing member disposed between the head of the bolt and the nut to press the object to be fixed, And a locking pin insertion hole formed at a peripheral portion of the bolt insertion hole of the body and into which the locking pin can be inserted. 21. A nut bolt in which a nut portion and a bolt portion are continuously formed, a female screw portion formed to penetrate the nut bolt along the axial direction, and a male screw portion screwed into the female screw portion. The provided bolt, a locking conical portion formed at an intermediate portion of the nut bolt, a first taper portion and a locking surface formed on the locking conical portion, and a bolt portion of the nut bolt are screwed. The tightening cylinder for tightening the object to be tightened together with the nut portion of the nut bolt, and the locking conical portion formed in a ring shape on the inner peripheral surface of the female screw portion of the tightening cylinder. A locking groove formed between the locking groove and one surface of the tightening cylinder;
A fastener comprising: a second tapered portion that contacts a tapered portion; and a slit formed from one surface of the tightened cylinder toward a length direction of the tightened cylinder. 22. A nut bolt in which a nut portion and a bolt portion are continuously formed, a female screw portion formed through the nut bolt along the axial direction, and a male screw portion screwed into the female screw portion. A fastening tool, comprising: a provided bolt; and a nut into which the bolt portion of the nut bolt is screwed and which tightens an object to be fastened together with the nut portion of the nut bolt. 23. A nut bolt in which a nut portion and a bolt portion are continuously formed, a female screw portion formed through the nut bolt along the axial direction, and a male screw portion screwed into the female screw portion. A bolt provided, a nut into which the bolt portion of the nut bolt is screwed and a nut to be tightened together with the nut portion of the nut bolt; a nut locking recess formed on the bottom surface of the nut; An inclined surface formed in the locking concave portion, a locking wall surface formed at one end of the nut locking concave portion, a stopper provided between the bolt portion of the nut bolt and the nut, A bolt insertion portion formed in a metal fitting, and is formed at one end of the metal fitting and is received in the nut locking concave portion, and is locked to the locking wall surface only when the nut is rotated in a loosening direction. Rotate the nut A fastening tool, comprising: an inclined rising pin portion for blocking; and a bent pin portion formed at the other end of the stopper and locked to the object to be fastened. 24. A fastener comprising a bolt and a nut into which a male screw portion of the bolt is screwed, wherein an outer peripheral portion of the nut or the bolt head is rotated by a known spanner or the like. A fastener characterized in that it is formed in a shape that does not allow it to be clamped. 25. The fastener according to claim 24, wherein a step is formed on the outer periphery of the nut or bolt head. 26. The fastener according to claim 24, wherein a groove is formed in an outer peripheral portion of the nut or bolt head. 27. A fastening tool comprising a bolt and a nut into which a male screw portion of the bolt is screwed, wherein the nut or the outer periphery of the bolt head is rotated with a known spanner or the like. And a tool insertion hole formed in the top surface of the nut or bolt head.