JP2007107701A - Looseness preventive device of bolt or nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a looseness-preventive device of a bolt or a nut which can form an engaging part or an engaged part which provides on a plate for hook or the like by a number of recesses so as to be able to attach a pawl for hook of the plate for the hook in parallel to side face of a fastened member. <P>SOLUTION: The looseness-preventive device 100 of the bolt or the nut comprises a cylindrical boss part 110 provided in center with a through hole 113 into which a head of the bolt or the nut fits and the plate for the hook 120 which is vertically slidably fit-inserted on the boss part 110. The device is configured so that the boss part 110 is provided with the engaging part 112 formed at protuberance 112a on outer peripheral surface and the plate for the hook 120 is provided with a flat part 121 which has a fitting insertion hole 122 fit-inserting on the boss part 110 and the pawl for the hook 124 which suspends from side of the flat part 121 while the fitting insertion hole 122 is simultaneously provided with the engaging part 123 which is formed at the recesses 123a vertically slidably fitting on the engaging part of the boss part on inner peripheral surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bolt or nut locking device, and more particularly to a bolt or nut locking device used in a fastening device for fixing a railroad rail to a sleeper.

  In a railway track using a concrete sleeper such as a PC sleeper, the railway rail is composed of a spring clip that engages the top surface of the bottom of the rail and a bolt or bolt and nut that secures the spring clip to the PC sleeper. Although it is fastened to the sleeper by the fastening device, the vibration of the passing train is applied to the bolt or nut via the spring clip or sleeper, and the bolt or nut turns gradually to cause loosening, and the fastening force to the rail Therefore, a locking device is attached to the bolt head or nut so as to prevent rotation of the bolt or nut and prevent loosening.

And as such a locking device, it hangs down from the flat part in which the fitting hole fitted to the outer periphery of a bolt head was formed, and the both ends of a flat part, and engages with both sides of a spring clip Using a locking plate having a pair of locking claws, a V-shaped recess formed on the inner periphery of the fitting hole engages with a corner of the bolt head to prevent rotation of the bolt. (See Patent Documents 1 and 2).
Japanese Utility Model Publication No. 45-1785 Japanese Utility Model Publication No. 51-78503

However, in such a locking device, since the V-shaped recess has the same opening angle as the corner of the bolt head, if the number is increased, the recess becomes shallower and the locking force that prevents the rotation of the bolt decreases. Therefore, in the hexagonal bolt, twelve of the multiples are formed at the same opening angle of 60 degrees as the bolt corner.
For this reason, depending on the position of the corner when tightening the bolt, the locking claw cannot be inserted on both sides of the spring clip. Therefore, the tightening amount of the bolt or nut can be adjusted to adjust the V-shaped recess and the corner of the bolt head. After matching the two so that they can be mounted in parallel on both sides of the spring clip, the locking device must be mounted on the spring clip, which causes a problem that the mounting work is complicated.

  Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention is to cover the locking claw portion of the locking plate regardless of the position of the corner of the bolt or nut at the time of fastening. By providing a bolt or nut locking prevention device in which an engaging portion or an engaged portion provided on a locking plate or the like can be formed by a large number of recesses so that it can be mounted in parallel to the side surface of the fastening member. is there.

  The invention according to claim 1 includes a columnar boss portion provided with a through-hole into which a bolt head or a nut is fitted at the center, and a locking plate that is slidably inserted into the boss portion. An anti-loosening device, wherein the boss portion includes an engaging portion having convex portions or concave portions formed on the outer peripheral surface at equal intervals, and the locking plate is inserted into the boss portion. And a locking claw portion depending from a side portion of the flat portion, and the fitting insertion hole is slidable up and down in the convex portion or concave portion of the engaging portion on the inner peripheral surface. The above-described problems are solved by providing the engaged portions in which the concave portions or the convex portions to be fitted are formed at equal intervals.

  The invention according to claim 2 is the invention according to claim 1, wherein the engagement portion or the engaged portion is formed of at least 36 concave portions, thereby solving the problem. It is.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the boss portion is composed of an upper cylindrical portion and a lower engaging portion having a convex portion, The locking plate is fitted into the boss portion so as not to be detached by a retaining member fixed above and below the boss portion, thereby solving the above-mentioned problem.

  The invention according to claim 1 is characterized in that a cylindrical boss portion having a through hole into which a bolt head or a nut is fitted at the center has an engaging portion in which convex portions or concave portions are formed at equal intervals on the outer peripheral surface. In addition, the insertion holes of the locking plate to be inserted into the boss part are arranged at equal intervals on the inner peripheral surface of the protrusions or the recesses of the engagement part slidably fitted into the protrusions or the recesses. Since the engagement between the engagement portion and the engaged portion is prevented from rotating the bolt or the nut, the recessed portion that forms the engagement portion or the engaged portion, The shape and number of convex portions can be arbitrarily set regardless of the shape of the bolt head or nut. For this reason, the engaging portion provided on the locking plate or the like so that the locking claw portion can be mounted in parallel to the side surface of the member to be fastened, regardless of the position of the corner of the bolt or nut at the time of fastening. Or it becomes possible to form a to-be-engaged part with many recessed parts. Moreover, since the inner peripheral surface engages almost entirely with the projections and recesses, the bolts or nuts can be reliably prevented from rotating even if the engagement portion or engaged portion is formed with a large number of recesses. As a result, it is possible to effectively exhibit the locking action.

  In the invention according to claim 2, in addition to the effect of the invention according to claim 1, since the engaging portion or the engaged portion is formed of at least 36 concave portions, the bolt head or the nut is fastened. Without adjusting the position, the locking claw portion of the locking plate can be mounted in parallel to the side of the fastened member such as a spring clip, so that the mounting operation can be performed easily. In addition, since the locking claw portions are mounted in parallel without being plastically deformed at the time of mounting, they can be easily removed from the fastened member such as a spring clip at the time of track maintenance work such as rail replacement, etc. Since it can be reused without processing, the cost required for track maintenance can be reduced.

  In the invention according to claim 3, in addition to the effect produced by the invention according to claim 1 or 2, the boss part is composed of an upper cylindrical part and a lower engaging part having a convex part. The locking plate is inserted into the boss portion so as not to be detached by a retaining member fixed above and below the boss portion, so that the boss portion and the locking plate are integrated and easy to handle. It is. Moreover, since the upper cylindrical portion acts as a guide, the mounting operation can be performed more easily.

  The bolt or nut locking device according to the present invention has a cylindrical boss portion with a through hole into which the bolt head or nut is fitted at the center, and convex or concave portions formed on the outer peripheral surface at equal intervals. The locking plate includes a flat portion provided with a fitting insertion hole to be fitted into the boss portion, and a locking claw portion depending from the side portion of the flat portion, and the fitting insertion hole, By providing an engaged portion in which concave portions or convex portions that are slidably fitted to the engaging portion of the boss portion are formed at equal intervals on the inner peripheral surface, any corner portion of the bolt or nut at the time of fastening is selected. Even in this position, the engaging portion or the engaged portion can be formed with a large number of concave portions so that the locking claw portion can be mounted in parallel to the side surface of the fastened member. Any specific form may be employed.

  That is, the boss portion can be formed of either plastic or metal. However, when thermoplastic engineering plastic such as polyamide or aluminum is used, the boss portion is excellent in corrosion resistance and can be manufactured in large quantities by injection molding or die casting. Further, the through hole into which the bolt or nut is fitted may have any shape as long as the bolt or nut can be non-rotatably fitted to the boss portion. For example, the through hole may have the same shape as the bolt head or nut. It is good also as a multiple of the corner | angular part as the V-shaped recessed part same as the corner | angular part of a head or a nut. Further, the engaging portion may be formed on the entire outer surface of the boss portion, or may be formed only on the lower portion.

  The locking plate may be either plastic or metal, but is preferably made of stainless steel from the viewpoint of strength and corrosion resistance. Further, the locking claws that hang down from the side of the flat part may be formed only on one side, but if a pair is formed on both sides so as to sandwich both sides of the fastened member, it will rotate with respect to the bolt or nut. This is preferable because the prevention function is improved.

The cross-sectional shape of the concave portion and the convex portion forming the engaging portion and the engaged portion may be any of an arc shape, a square shape, a V shape, etc. as long as the concave portion and the convex portion can be fitted. A tapered guide surface may be provided at the insertion end.
Further, according to the experiment by the present inventor, when the engaging portion or the engaged portion is formed by 36 concave portions, the boss portion and the locking plate are formed on the corresponding engaged portion or the convex portion of the engaging portion. Can be fitted without positioning, so that the locking claw can be attached to the fastening member regardless of the position of the corner of the bolt or nut at the time of fastening. In order to be able to be mounted parallel to the side surface, it is preferable that the engaging portion or the engaged portion is formed of at least 36 concave portions. The number of corresponding convex portions may be smaller than that of the concave portions, but the same number is preferable because engagement is ensured.

Embodiments of the present invention will be described below with reference to the drawings.
Here, FIG. 1 is a perspective view of a railroad rail mounted with a locking device for a rotation fastening member according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2, FIG. 4 is an assembly view of the locking device for the rotation fastening member of this embodiment, and FIG. 5 is a perspective view of the rotation fastening member of this embodiment. FIG. 6 is an explanatory view showing a mounting method of the locking device for the rotation fastening member of this embodiment.

  As shown in FIG. 1, the rail R is placed on a PC sleeper S via a buffer pad P, and a spring clip 210 constituting a fastening device 200 is engaged with the rail bottom top surface. The spring clip 210 is fastened by fixing it to the PC sleeper S with the hexagon bolt 220. The spring clip 210 is provided with a locking device 100 for preventing the bolt 220 from rotating and preventing it from loosening.

  As shown in FIGS. 2 and 3, the locking device 100 includes a columnar boss portion 110 and a locking plate 120 that is fitted on the outer periphery of the boss portion 110 so as to be vertically slidable. A locking claw portion 124 that is suspended from both sides of the locking plate 120 while the head portion 220a of the hexagon bolt 220 fastened via the washer 230 is inserted into the through hole 113 formed in 124 is engaged with the spring clip 210 so as to sandwich both sides thereof.

  As shown in FIG. 4, the boss part 110 is composed of an upper cylindrical part 111 and a lower engaging part 112, and the engaging part 112 is gear-shaped at regular intervals so as to protrude from the outer peripheral surface of the cylindrical part 111. Are formed with 36 cross-sectionally trapezoidal convex portions 112a. Further, a hexagonal through-hole 113 is formed in the center of the boss portion 110 to fit the head 220a of the hexagon bolt 220.

  The locking plate 120 includes a rectangular flat portion 121 and a pair of locking claw portions 124 and 124 that are integrally provided at both ends of the flat portion 121 and hang so as to face each other. The part 121 is provided with a fitting insertion hole 122 for being slidably inserted into the boss part 110, and an engagement part provided on the outer peripheral surface of the boss part 110 on the inner peripheral surface of the fitting insertion hole 122. 112 to be engaged is formed, and the engaged portion 123 is formed by 36 concave portions 123a having similar shapes formed at equal intervals so as to be engaged with the convex portions 112a of the engaging portion 112. Is formed.

  The pair of locking claws 124 and 124 includes shoulder portions 124a and 124a connected to the flat portion 121, central recess portions 124b and 124b that sandwich both sides of the spring clip, and tip portions 124c and 124c. The tip portions 124c and 124c are spread outward so as to serve as a guide when the spring clip 210 is mounted.

The upper and lower surfaces of the boss portion 110 are provided with retaining members 130 and 140 that prevent the inserted mounting plate 120 from falling off. The upper retaining member 130 is a disk having a larger diameter than the boss portion 110. The lower retaining member 140 that is fixed to the upper surface of the boss portion 110 is integrally formed with the boss portion 110 and has a circular flange shape that protrudes from the outer periphery of the boss portion 110. Further, an insertion hole 131 into which a bolt head or a nut can be inserted is formed at the center of the retaining member 130.
In this embodiment, the lower retaining member 140 is integrally formed with the boss portion 110. However, it is formed separately from the retaining member 130 provided above the boss portion 110, and the bottom portion of the boss portion 110 is formed. It may be fixed to.

  Then, the mounting plate 120 is fitted and inserted into the boss portion 110 from above the boss portion 110 via the fitting insertion hole 121, and then the retaining member 130 is fixed to the upper surface of the boss portion 110. The locking plate 120 is integrated with the locking device 100 of this embodiment shown in FIG.

Next, a mounting method of the locking device 100 of the present embodiment assembled in this way will be described with reference to FIG.
First, as shown in FIG. 6A, after the mounting plate 120 is pulled up to the cylindrical portion 111 of the boss portion 110, the boss portion 110 is attached to the bolt head portion 220 a through the fitting insertion hole 122. At this time, since the leading ends 124c and 124c of the locking claws 124 and 124 of the locking plate 120 are located away from the upper surface of the spring clip, the locking claws 124 and 124 are located on both sides of the spring clip. Rotate to be parallel.

  Next, as shown in FIG. 6 (b), when the locking plate 120 is lowered, the engaged portion 123 of the locking plate is formed by 36 concave portions 123a, so that the alignment is performed. In the state where the locking claw portions 124 and 124 are parallel to the spring clip 210, the concave portion 123a is fitted with the convex portion 113a of the boss portion, and the front end portions 124c and 124c of the locking claw portions 124 and 124 are The spring clip 210 is elastically expanded in contact with the end of the spring clip 210 and abuts on both side surfaces of the spring clip 210.

  Further, when the locking plate 120 is pushed into the spring clip 210, both sides of the spring clip 210 are fitted into the recessed portions 124b and 124b of the locking claws 124 and 124, as shown in FIG. In this state, the locking device 100 is attached.

  Thus, according to the locking device 100 for the rotation fastening member of the present embodiment, the locking claws 124 and 124 of the locking plate 120 are adjusted without adjusting the position of the bolt head 220a that is fastened. Can be arranged in parallel to the side surface of the spring clip 210, so that the mounting operation is easy.

  When the rail is replaced due to wear or the like, the locking claws 124 and 124 of the locking plate 120 are mounted on the spring clip 210 without plastic deformation, so that the locking device 100 is removed from the spring clip. Easy to remove. Further, since the latching claw portions 124 and 124 are not deformed even when they are removed, they can be reused without performing correction or the like, and the cost required for track maintenance can be reduced.

  In this embodiment, the retaining plates 130 and 140 provided above and below the boss portion 110 hold the locking plate 120 so as not to drop off from the boss portion 110. However, the retaining members 130 and 140 are not provided. In this case, the engaging portion 112 may be formed on the entire outer periphery of the boss portion 110, or the engaging portion 112 may be a recess. Such a configuration simplifies the structure and can be manufactured at a low cost.

  Further, in this embodiment, the bolt rail locking device in the railroad rail fastening device has been described, but it can also be applied as a nut locking device, and further, there is a locking claw portion such as the spring clip. Any member to be fastened having side surfaces that can be engaged is applicable.

  As described above in detail, according to the locking device of the present invention, the engagement portion on the outer peripheral surface of the cylindrical boss portion provided with the through hole into which the bolt head or the nut is fitted at the center, and the locking Since the rotation of the bolt or nut is prevented by the engagement with the engaged portion of the inner peripheral surface of the fitting insertion hole of the plate for use, the shape of the concave portion or the convex portion forming the engaging portion or the engaged portion, and The number can be arbitrarily set regardless of the shape of the bolt head or nut. Therefore, the engaging portion or the engaged portion provided on the locking plate or the like is provided with a number of concave portions so that the locking claw portion can be mounted in parallel to the side surface of the fastened member regardless of the fastening position of the bolt or nut. The fastening operation can be simplified by forming. In addition, when replacing the rail, it can be easily removed from the spring clip, and since it is not plastically deformed even if it is removed, it can be reused and the cost required for track maintenance can be reduced. This is a great effect.

1 is a perspective view of a railroad rail mounted with a locking device according to an embodiment of the present invention. Sectional drawing of the AA line of FIG. Sectional drawing of the BB line of FIG. The assembly drawing of the locking device of a present Example. The perspective view of the locking device of a present Example. Explanatory drawing which shows the mounting method of the locking device of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Loosening prevention apparatus 110 ... Cylindrical boss | hub part 111 ... Cylindrical part 112 ... Engagement part 112a ... Convex part 113 ... Through-hole 120 ... Locking plate 121 ... Flat part 122 ... Insertion hole 123 ... Engaged part 123a ... Recessed part 124 ... Locking claw part 124a ... Shoulder part 124b ... Recessed part 124c ... Tip part 130 ... Upper retaining member 131 ... Insertion hole 140 ... Lower retaining member 200 ... Fastening device 210 ... Spring clip 220 ... Bolt 220a ... Bolt head 230・ ・ ・ Washer S ・ ・ ・ Sleeper R ・ ・ ・ Railway rail P ・ ・ ・ Pad

Claims (3)

A locking device comprising a cylindrical boss portion provided with a through-hole into which a bolt head or a nut is fitted at the center, and a locking plate that is slidably inserted into the boss portion so as to be vertically slidable.
The boss portion includes an engaging portion in which convex portions or concave portions are formed at equal intervals on the outer peripheral surface,
The locking plate includes a flat portion provided with a fitting insertion hole to be fitted into the boss portion, and a locking claw portion depending from a side portion of the flat portion, and the fitting insertion hole has an inner periphery. A bolt or a nut loosening prevention characterized in that a concave portion or a convex portion, which is slidably fitted into a convex portion or a concave portion of the engaging portion on the surface, is formed at equal intervals. apparatus.   The bolt or nut locking device according to claim 1, wherein the engaging portion or the engaged portion is formed of at least 36 concave portions.   The cylindrical boss part is composed of an upper cylindrical part and a lower engaging part having a convex part, and the locking plate cannot be detached by a retaining member fixed above and below the boss part. The bolt or nut locking device according to claim 1 or 2, wherein the bolt or nut is fitted into the boss portion.

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