WO2020121865A1 - Loosening prevention structure for nut fastened on bolt - Google Patents

Loosening prevention structure for nut fastened on bolt Download PDF

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Publication number
WO2020121865A1
WO2020121865A1 PCT/JP2019/046998 JP2019046998W WO2020121865A1 WO 2020121865 A1 WO2020121865 A1 WO 2020121865A1 JP 2019046998 W JP2019046998 W JP 2019046998W WO 2020121865 A1 WO2020121865 A1 WO 2020121865A1
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WIPO (PCT)
Prior art keywords
bolt
thin plate
nut
vertical groove
gate
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PCT/JP2019/046998
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French (fr)
Japanese (ja)
Inventor
良三 太田
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良三 太田
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Publication of WO2020121865A1 publication Critical patent/WO2020121865A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/10—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt

Definitions

  • the present invention is a method for preventing loosening of a nut tightened on a bolt that requires a strong tightening force.
  • the present invention prevents the nut tightened on the bolt from loosening and falling off due to strong vibration.
  • a lid 7 is provided on the head of the tightening nut 5 so that the upper end of the bolt 1 is covered, and one vertical groove 8 is provided so that the lid is divided into two from above.
  • the upper member 18 is placed on the lower member through the bolt hole 19 and the tightening nut is tightened to the bolt, and then the portal thin plate 14 is inserted into the vertical groove 8 from above. It is driven and press-fitted between both side walls 9 of the vertical groove, the cutting blades 16 at the inner ends of both feet 15 are bite into the corners 3 around the upper end of the bolt, and the tightening nut is rotated on the bolt. Try to bind impossiblely.
  • the gate-shaped thin plate 14 is driven into the vertical groove 8 of the lid portion 7 of the tightening nut from above, and the cutting blades 16 at the inner ends of the two feet are bited into the corner portion 3 around the upper end portion of the bolt 1 for tightening.
  • a thin flat glass is driven into the triangular narrow groove 11 which is cut parallel to the vertical groove 8 of the lid portion of the tightening nut.
  • the wall 12 between the groove and the narrow groove is bent so as to cover the portal thin plate so as to prevent the portal thin plate from escaping.
  • the gate-shaped thin plate 14 is driven into the vertical groove 8 of the lid portion 7 of the tightening nut from above, and the cutting blades (16) at the inner ends of both feet of the foot are bited into the corner portions 3 around the upper end portion of the bolt 1.
  • the tightening nut is strongly tightened to the bolt, it is possible to surely prevent the nut from loosening, and it is possible to prevent the nut from being violently vibrated such as a railroad vehicle.
  • a vertical cross-sectional view of a state in which a tightening nut having a lid portion provided on a head of a bolt is tightened to prevent loosening Side view of FIG. Plan view of FIG. Front view of the portal sheet incorporated in FIGS. 1, 2 and 3. Side view of FIG. As an example of an embodiment of the present invention, a vertical cross-sectional view of a tightening nut provided with a lid on the head. Side view of FIG. As an example of an embodiment of the present invention, a vertical cross-sectional view of a state in which a tightening nut provided with a lid portion on a bolt head is tightened to prevent loosening, and a gate thin plate is further prevented from coming off. Side view of FIG. Plan view of FIG.
  • a lid 7 is provided on the head of the tightening nut 5 so that the upper end of the bolt 1 is covered, and one vertical groove 8 is provided so that the lid is divided into two from above.
  • the upper member 18 is placed on the lower member through the bolt hole 19 and the tightening nut is tightened to the bolt, and then the portal thin plate 14 is inserted into the vertical groove 8 from above. It is driven and press-fitted between both side walls 9 of the vertical groove, the cutting blades 16 at the inner ends of both feet 15 are bite into the corners 3 around the upper end of the bolt, and the tightening nut is rotated on the bolt. Try to bind impossiblely.
  • a large number of horizontally long narrow chevron projections 10 are provided on both side walls 9 of the vertical groove 8 of the cover portion 7 of the tightening nut, and the distance between the crests of the chevron projections on both side walls is made smaller than the thickness of the gate thin plate 14.
  • the gate-shaped thin plate 14 is driven into the vertical groove 8 of the lid portion 7 of the tightening nut from above, and the cutting blades 16 at the inner ends of the two feet are bited into the corner portion 3 around the upper end portion of the bolt 1 for tightening.
  • a thin flat glass is driven into the triangular narrow groove 11 which is cut parallel to the vertical groove 8 of the lid portion of the tightening nut.
  • the wall 12 between the groove and the narrow groove is bent so as to cover the portal thin plate so as to prevent the portal thin plate from escaping.
  • the gate-shaped thin plate 14 is driven into the vertical groove 8 of the lid portion 7 of the tightening nut from above, and the cutting blades 16 at the inner end tips of both feet bite into the corner portion 3 around the upper end portion of the bolt 1 for tightening.
  • the gate-shaped thin plate pushing-in crown 17 is screwed into the male screw 13 on the outer periphery of the cover portion 7 of the tightening nut to press the gate-shaped thin plate to prevent the escape. ..
  • the external thread on the outer periphery of the lid is a fine thread, and the fitting is in a state where it can be strongly tightened.

Abstract

[Problem] To provide a method of preventing the loosening of a nut fastened over a bolt requiring strong fastening force. [Solution] A loosening prevention structure for a fastening nut in which a lid part 7 of a fastening nut is provided to a head part of a fastening nut 5 and is given a shape that covers the upper end of a bolt 1, a single vertical groove is provided so as to divide the lid part in two from above, the bolt is secured to a lower member 20 by an implanting method, an upper member 18 is then passed through a bolt hole and placed on top of the lower member to fasten the fastening nut to the bolt, a portal thin plate 14 is then driven into the vertical groove 8 from above and pressure-fitted in between the side walls of the vertical groove, cutting edges of the inner-part tip ends of both legs of the portal thin plate are embedded into the corner parts 3 in the periphery of the upper end of the bot, and the fastening nut is non-rotatably joined to the bolt.

Description

ボルトに締め込むナットの緩み止の構造Structure to prevent loosening of nuts tightened on bolts
  本発明は強い締付け力を必要とするボルトに締め込んだナットの緩み止を行う方法である。 The present invention is a method for preventing loosening of a nut tightened on a bolt that requires a strong tightening force.
  緩み止のためボルトにナットを固定する方法としては、ナットとボルトを貫通する共孔を開けここに割ピンを押込んで固定する方法があるが、この穿孔は現地で行うこともあり面倒であり、又一度ねじ戻しの後、再びナットを締めこむときは合致しない欠点があり、又ころがり軸受を押え込む時に使用するナットは細目ねじであり、大きな荷重には耐えきれず、しかも軸には溝加工を必要とするため広範囲に使用する並目ねじボルトに用いることは不適である、又ねじ面の摩擦力を高めるためのダブルナット式の緩み止ナットもあるが、この効果は不明である。 As a method of fixing the nut to the bolt to prevent it from loosening, there is a method of opening a common hole that penetrates the nut and the bolt and pushing the cotter pin here to fix it, but this drilling is done on site and it is troublesome. Also, there is a drawback that it does not match when tightening the nut again after unscrewing it once again.The nut used when pressing the rolling bearing is a fine screw, it can not bear a large load, and the shaft has a groove. Since it requires machining, it is unsuitable for use in coarse threaded bolts that are used in a wide range, and there is a double nut type locking nut for increasing the frictional force of the thread surface, but this effect is unknown.
  本発明はボルトに締込むナットが強振動により緩み、脱落することを防ぐものである。 The present invention prevents the nut tightened on the bolt from loosening and falling off due to strong vibration.
  締付ナット５の頭部に蓋部７を設けて、ボルト１の上端を掩う形状とし、その蓋部を上方より二分割するように一本の縦溝８を設けておき、そしてボルトを植込みの方法により下部材２０に固定した後、上部材１８をそのボルト孔１９を通して下部材の上に載せ締付ナットをボルトに締付けた後、前記の縦溝８に上方より門形薄板１４を打込んで、縦溝の両側壁９の間に圧入させ、その両足１５の内側部先端の切刃１６をボルトの上端部周辺の角部３に食込ませて、締付ナットをボルトに回転不能に結合するようにする。 A lid 7 is provided on the head of the tightening nut 5 so that the upper end of the bolt 1 is covered, and one vertical groove 8 is provided so that the lid is divided into two from above. After fixing to the lower member 20 by the method of implantation, the upper member 18 is placed on the lower member through the bolt hole 19 and the tightening nut is tightened to the bolt, and then the portal thin plate 14 is inserted into the vertical groove 8 from above. It is driven and press-fitted between both side walls 9 of the vertical groove, the cutting blades 16 at the inner ends of both feet 15 are bite into the corners 3 around the upper end of the bolt, and the tightening nut is rotated on the bolt. Try to bind impossiblely.
  締付ナットの蓋部７の縦溝８に上方より門形薄板１４を打込んでその両足の内側部先端の切刃１６をボルト１の上端部周辺の角部３に食込ませて締付ナットをボルトに回転不能に結合させた後、締付ナットの蓋部の縦溝８に接近して平行に切込まれた三角形の細溝１１に薄肉の平たがねを打込んで、縦溝と細溝の間の壁１２を門形薄板にかぶせるように折曲げて門形薄板の脱出を阻止するようする。 The gate-shaped thin plate 14 is driven into the vertical groove 8 of the lid portion 7 of the tightening nut from above, and the cutting blades 16 at the inner ends of the two feet are bited into the corner portion 3 around the upper end portion of the bolt 1 for tightening. After the nut is non-rotatably connected to the bolt, a thin flat glass is driven into the triangular narrow groove 11 which is cut parallel to the vertical groove 8 of the lid portion of the tightening nut. The wall 12 between the groove and the narrow groove is bent so as to cover the portal thin plate so as to prevent the portal thin plate from escaping.
  締付ナットの蓋部７の縦溝８に上方より門形薄板１４を打込んでその両足の内側部先端の切刃（１６）をボルト１の上端部周辺の角部３に食込ませて締付ナットをボルトに回転不能に結合させた後、締付ナットの蓋部７外周の雄ねじ１３に門形薄板押込用円冠１７をねじ込んで、門形薄板を押圧して脱出を阻止するようにする。 The gate-shaped thin plate 14 is driven into the vertical groove 8 of the lid portion 7 of the tightening nut from above, and the cutting blades (16) at the inner ends of both feet of the foot are bited into the corner portions 3 around the upper end portion of the bolt 1. After connecting the tightening nut to the bolt in a non-rotatable manner, screw the gate-shaped thin plate pushing-in crown 17 into the male screw 13 on the outer periphery of the cover 7 of the tightening nut to press the gate-shaped thin plate to prevent escape. To
  本発明の実施によりボルトに締付ナットを強く締め込んだ後、確実な緩み止が可能にな
り、鉄道車両等振動の激しいナットの脱落を防止しうるようになる。 According to the embodiment of the present invention, after the tightening nut is strongly tightened to the bolt, it is possible to surely prevent the nut from loosening, and it is possible to prevent the nut from being violently vibrated such as a railroad vehicle.
本発明の実施形態の一例として、ボルトに頭部に蓋部を設けた締付ナットを締め込み、緩み止を行った状態の縦断面図As an example of an embodiment of the present invention, a vertical cross-sectional view of a state in which a tightening nut having a lid portion provided on a head of a bolt is tightened to prevent loosening. 図１の側面図Side view of FIG. 図１の平面図Plan view of FIG. 図１、図２及び図３に組込まれている門形薄板の正面図Front view of the portal sheet incorporated in FIGS. 1, 2 and 3. 図４の側面図Side view of FIG. 本発明の実施形態の一例として、頭部に蓋部を設けた締付ナットの縦断面図As an example of an embodiment of the present invention, a vertical cross-sectional view of a tightening nut provided with a lid on the head. 図６の側面図Side view of FIG. 本発明の実施形態の一例として、ボルト頭部に蓋部を設けた締付ナットを締め込み、緩み止を行ない更に門形薄板の抜け止を行った状態の縦断面図As an example of an embodiment of the present invention, a vertical cross-sectional view of a state in which a tightening nut provided with a lid portion on a bolt head is tightened to prevent loosening, and a gate thin plate is further prevented from coming off. 図８の側面図Side view of FIG. 図８の平面図Plan view of FIG.
  締付ナット５の頭部に蓋部７を設けて、ボルト１の上端を掩う形状とし、その蓋部を上方より二分割するように一本の縦溝８を設けておき、そしてボルトを植込みの方法により下部材２０に固定した後、上部材１８をそのボルト孔１９を通して下部材の上に載せ締付ナットをボルトに締付けた後、前記の縦溝８に上方より門形薄板１４を打込んで、縦溝の両側壁９の間に圧入させ、その両足１５の内側部先端の切刃１６をボルトの上端部周辺の角部３に食込ませて、締付ナットをボルトに回転不能に結合するようにする。 A lid 7 is provided on the head of the tightening nut 5 so that the upper end of the bolt 1 is covered, and one vertical groove 8 is provided so that the lid is divided into two from above. After fixing to the lower member 20 by the method of implantation, the upper member 18 is placed on the lower member through the bolt hole 19 and the tightening nut is tightened to the bolt, and then the portal thin plate 14 is inserted into the vertical groove 8 from above. It is driven and press-fitted between both side walls 9 of the vertical groove, the cutting blades 16 at the inner ends of both feet 15 are bite into the corners 3 around the upper end of the bolt, and the tightening nut is rotated on the bolt. Try to bind impossiblely.
  締付ナットの蓋部７の縦溝８の両側壁９に水平方向に長い細幅の山形突起１０を数多く設け、この両側壁の山形突起の山頂の間隔を門形薄板１４の厚さより狭くして、この間隔に門形薄板を打込むことにより、両側壁の山形突起の山頂を下向きに押し曲げ、押拡げながら門形薄板を押下げ、門形薄板の両足１５の内側部先端の切刃１６をボルトの上端部周辺の角部３に食込ませて、締付ナットをボルトに回転不能に結合させるようにする。 A large number of horizontally long narrow chevron projections 10 are provided on both side walls 9 of the vertical groove 8 of the cover portion 7 of the tightening nut, and the distance between the crests of the chevron projections on both side walls is made smaller than the thickness of the gate thin plate 14. By pushing the gate-shaped thin plate at this interval, the peaks of the chevron protrusions on both side walls are bent downward, and the gate-shaped thin plate is pushed down while being expanded, and the cutting blades at the inner end of both legs 15 of the gate-shaped thin plate are pushed. 16 is engaged in the corner 3 around the upper end of the bolt so that the tightening nut is non-rotatably connected to the bolt.
  締付ナットの蓋部７の縦溝８に上方より門形薄板１４を打込んでその両足の内側部先端の切刃１６をボルト１の上端部周辺の角部３に食込ませて締付ナットをボルトに回転不能に結合させた後、締付ナットの蓋部の縦溝８に接近して平行に切込まれた三角形の細溝１１に薄肉の平たがねを打込んで、縦溝と細溝の間の壁１２を門形薄板にかぶせるように折曲げて門形薄板の脱出を阻止するようにする。 The gate-shaped thin plate 14 is driven into the vertical groove 8 of the lid portion 7 of the tightening nut from above, and the cutting blades 16 at the inner ends of the two feet are bited into the corner portion 3 around the upper end portion of the bolt 1 for tightening. After the nut is non-rotatably connected to the bolt, a thin flat glass is driven into the triangular narrow groove 11 which is cut parallel to the vertical groove 8 of the lid portion of the tightening nut. The wall 12 between the groove and the narrow groove is bent so as to cover the portal thin plate so as to prevent the portal thin plate from escaping.
  締付ナットの蓋部７の縦溝８に上方より門形薄板１４を打込んでその両足の内側部先端の切刃１６をボルト１の上端部周辺の角部３に食込ませて締付ナットをボルトに回転不能に結合させた後、締付ナットの蓋部７外周の雄ねじ１３に門形薄板押込用円冠１７をねじ込んで、門形薄板を押圧して脱出を阻止するようにする。
  蓋部外周の雄ねじは細目ねじとし、その嵌合は強く締められる状態とする。又門形薄板の上端面を左右反対方向の傾斜をつけることにより門形薄板を押込用円冠１７により締め込むときは容易に回転でき、反対に振動により緩む方向に動かされるようになるときは、その回転を阻止させることが可能になる。 The gate-shaped thin plate 14 is driven into the vertical groove 8 of the lid portion 7 of the tightening nut from above, and the cutting blades 16 at the inner end tips of both feet bite into the corner portion 3 around the upper end portion of the bolt 1 for tightening. After the nut is non-rotatably connected to the bolt, the gate-shaped thin plate pushing-in crown 17 is screwed into the male screw 13 on the outer periphery of the cover portion 7 of the tightening nut to press the gate-shaped thin plate to prevent the escape. ..
The external thread on the outer periphery of the lid is a fine thread, and the fitting is in a state where it can be strongly tightened. Also, by tilting the upper end surface of the gate-shaped thin plate in the opposite direction to the left and right, it can be easily rotated when tightening the gate-shaped thin plate with the pushing crown 17, and conversely, when it is moved in the loosening direction by vibration. , It becomes possible to prevent the rotation.
 １・・・ボルト                           
 ２・・・ボルトの上端部雄ねじ
 ３・・・ボルトの上端部周辺の角部          
４・・・ボルトの植込ねじ
 ５・・・締付ナット                        
６・・・締付ナットの雌ねじ
７・・・締付ナットの蓋部                  
８・・・締付ナットの蓋部の縦溝
 ９・・・縦溝の両側壁                    
１０・・・縦溝の両側壁の山形突起
１１・・・締付ナットの蓋部の三角形の細溝  
１２・・・縦溝と細溝の間の壁
１３・・・締付ナットの蓋部外周の雄ねじ    
１４・・・門形薄板
１５・・・門形薄板の両足                  
１６・・・両足の内側部先端の切刃
１７・・・門形薄板押込用円冠              
１８・・・上部材
１９・・・上部材のボルト孔                
２０・・・下部材 1...bolt
2... Male screw on the upper end of the bolt 3... Corner around the upper end of the bolt
4... Bolt screw 5... Tightening nut
6... Female thread of tightening nut 7... Lid of tightening nut
8... Vertical groove on the lid of the tightening nut 9... Both side walls of the vertical groove
10... chevron protrusions on both side walls of the vertical groove 11... triangular narrow groove on the lid of the tightening nut
12... Wall between the vertical groove and the narrow groove 13... Male screw on the outer periphery of the cover of the tightening nut
14... Portal thin plate 15... Both legs of portal thin plate
16... Cutting edge at the inner tip of both feet 17... Circular crown for pushing in a gate-shaped thin plate
18... Upper member 19... Bolt hole of upper member
20... Lower member

Claims (4)

  1.   ボルトに締め込むナットの緩み止の構造において、締付ナット（５）の頭部に蓋部（７）を設けて、ボルト（１）の上端を掩う形状とし、その蓋部を上方より二分割するように一本の縦溝（８）を設けておき、そしてボルトを植込みの方法により下部材（２０）に固定した後、上部材（１８）をそのボルト孔（１９）を通して下部材の上に載せ締付ナットをボルトに締付けた後、前記の縦溝（８）に上方より門形薄板（１４）を打込んで、縦溝の両側壁（９）の間に圧入させ、その両足（１５）の内側部先端の切刃（１６）をボルトの上端部周辺の角部（３）に食込ませて、締付ナットをボルトに回転不能に結合するようにした締付ナットの緩み止の構造。 In the structure for preventing the loosening of the nut to be tightened to the bolt, the head (7) of the tightening nut (5) is provided with a lid (7) so that the upper end of the bolt (1) is covered with the lid (2) from above. One vertical groove (8) is provided so as to be divided, and the bolt is fixed to the lower member (20) by an implantation method, and then the upper member (18) is passed through the bolt hole (19) of the lower member. After mounting and tightening the tightening nuts on the bolts, the gate-shaped thin plate (14) is driven into the vertical groove (8) from above and press-fitted between both side walls (9) of the vertical groove. Loosening of the tightening nut so that the cutting edge (16) at the inner end of (15) bites into the corner (3) around the upper end of the bolt so that the tightening nut is non-rotatably connected to the bolt. Stop structure.
  2.   締付ナットの蓋部（７）の縦溝（８）の両側壁（９）に水平方向に長い細幅の山形突起（１０）を数多く設け、この両側壁の山形突起の山頂の間隔を門形薄板（１４）の厚さより狭くして、この間隔に門形薄板を打込むことにより、両側壁の山形突起の山頂を下向きに押し曲げ、押拡げながら門形薄板を押下げ、門形薄板の両足（１５）の内側部先端の切刃（１６）をボルトの上端部周辺の角部（３）に食込ませて、締付ナットをボルトに回転不能に結合させるようにした請求項１に記載の締付ナットの緩み止の構造。 A large number of horizontally elongated chevron projections (10) are provided on both side walls (9) of the vertical groove (8) of the cover portion (7) of the tightening nut, and the distance between the crests of the chevron projections on the both side walls is provided. By narrowing the thickness of the shape thin plate (14) and driving the gate thin plate at this interval, the peaks of the mountain projections on both side walls are pushed downward and bent, and the gate thin plate is pushed down while being expanded to push down the gate thin plate. The cutting blades (16) at the inner ends of both feet (15) of the foot are engaged with the corners (3) around the upper end of the bolt so that the tightening nut is non-rotatably coupled to the bolt. The structure to prevent the tightening nut from loosening.
  3.   締付ナットの蓋部（７）の縦溝（８）に上方より門形薄板（１４）を打込んでその両足の内側部先端の切刃（１６）をボルト（１）の上端部周辺の角部（３）に食込ませて締付
    ナットをボルトに回転不能に結合させた後、締付ナットの蓋部の縦溝（８）に接近して平行に切込まれた三角形の細溝（１１）に薄肉の平たがねを打込んで、縦溝と細溝の間の壁（１２）を門形薄板にかぶせるように折曲げて門形薄板の脱出を阻止するようにした請求項１に記載の締付ナットの緩み止の構造。     The gate-shaped thin plate (14) is driven into the vertical groove (8) of the lid portion (7) of the tightening nut from above, and the cutting blades (16) at the inner ends of both feet of the gate are placed around the upper end of the bolt (1). A triangular narrow groove cut parallel to the vertical groove (8) of the lid of the tightening nut after the nut is non-rotatably connected to the bolt by biting into the corner (3). A thin flat glass is driven into (11), and the wall (12) between the vertical groove and the narrow groove is bent so as to cover the portal thin plate to prevent the portal thin plate from escaping. The structure for preventing the tightening nut from loosening according to Item 1.
  4.   締付ナットの蓋部（７）の縦溝（８）に上方より門形薄板（１４）を打込んでその両足の内側部先端の切刃（１６）をボルト（１）の上端部周辺の角部（３）に食込ませて締付ナットをボルトに回転不能に結合させた後、締付ナットの蓋部（７）外周の雄ねじ（１３）に門形薄板押込用円冠（１７）をねじ込んで、門形薄板を押圧して脱出を阻止するようにした請求項１に記載の締付ナットの緩み止の構造。 The gate-shaped thin plate (14) is driven into the vertical groove (8) of the lid portion (7) of the tightening nut from above, and the cutting blades (16) at the inner ends of both feet of the fastening nut are placed around the upper end portion of the bolt (1). After the fastening nut is non-rotatably connected to the bolt by biting into the corner portion (3), the male screw (13) on the outer periphery of the lid portion (7) of the fastening nut is fitted with a circular crown (17) for pushing the gate-shaped thin plate. 2. The structure for preventing the tightening nut from loosening according to claim 1, wherein the gate-shaped thin plate is screwed to prevent the escape.
PCT/JP2019/046998 2018-12-10 2019-12-02 Loosening prevention structure for nut fastened on bolt WO2020121865A1 (en)

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JP2018246110A JP6536923B1 (en) 2018-12-10 2018-12-10 Locking structure of the nut which tightens to the bolt
JP2018-246110 2018-12-10

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS298824Y1 (en) * 1953-04-18 1954-07-26
JPH0136326B2 (en) * 1982-09-02 1989-07-31 Furukawa Electric Co Ltd
JP6296186B1 (en) * 2017-01-24 2018-03-20 良三 太田 Locking structure for nuts tightened on bolts

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS298824Y1 (en) * 1953-04-18 1954-07-26
JPH0136326B2 (en) * 1982-09-02 1989-07-31 Furukawa Electric Co Ltd
JP6296186B1 (en) * 2017-01-24 2018-03-20 良三 太田 Locking structure for nuts tightened on bolts

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