JP2017075689A - Locking bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking bolt having a simple constitution, being not left without locked, and capable of surely exerting a locking function with a simple constitution.SOLUTION: A locking bolt is composed of a bolt body, a diameter-expansion member, and a contact piece. The bolt body has a shaft hole formed at a rear end portion of a shaft center portion as a truncated conical space in which an end portion of the shaft hole is gradually expanded toward a tip, and the diameter-expansion member is disposed in the space of the bolt body, and has a truncated conical side face kept into contact with an inner wall of the space to expand the space. The shaft core portion has an insertion hole for inserting the contact piece, and the contact piece is provided with an insertion projecting portion to be inserted to the insertion hole of the diameter expansion member, and a flange portion vertical to the insertion projecting portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bolt having a locking function.

  Between the male threaded portion of the bolt and the female threaded portion that is screwed to the male threaded portion, it is screwed through the spiral strips / grooves provided in both screw portions, and by the frictional force acting between the surfaces of the spiral strips / grooves Mutual rotation is stopped and the fixing relationship is maintained. However, the frictional force generated between the spiral strip and the groove surface is only generated on the smooth gradient surface, and the gradient surfaces slip due to expansion, contraction, vibration, etc. due to temperature changes applied to both screw parts over a long period of time. The fixing condition between the male and female screw portions is broken, the bolt is loosened, the connection state / contact state between the connected objects is deteriorated, or the bolt is dropped, which may cause an accident.

  Therefore, various bolts having a locking function for preventing accidents of this type have been proposed, and the present inventor has already proposed a locking bolt (see Patent Document 1).

  In the locking bolt disclosed in Patent Document 1, as shown in FIG. 7, the bolt 310 includes a bolt body 311, a sub bolt 341, and a diameter-expanding member 331. The bolt body 311 is formed with a shaft hole 312 at at least one end of the shaft core portion so that a truncated cone-shaped space 317 is widened as the end of the shaft hole 312 is closer to the tip. The diameter-expanding member 331 is disposed in the space 317 of the bolt body 311 and has a truncated cone-shaped side surface that abuts against the inner wall of the space and expands the space, and the auxiliary bolt 341 is attached to the bolt body 311. It is inserted into the provided shaft hole 312, and the diameter expanding member 331 is moved in the direction of expanding the space of the bolt body 311 so as to apply a diameter expanding force to the space of the bolt body.

  It is possible to use the locking bolt having such a configuration as a hexagon socket set screw (enamel set). That is, it can be used for fixing a machine part or the like at the tip of the locking bolt or used for positioning. However, in this configuration, there are many disadvantages that the number of complicated parts to be processed is large and expensive, and there is a concern that the loosening prevention function cannot be sufficiently exhibited if the sub bolt is forgotten to be tightened or if the tightening is loose.

JP2012-127494A

  The present invention provides a locking bolt that simplifies the configuration, never forgets to tighten, is easy to construct and reliably exhibits its locking function.

  The locking bolt of the present invention is a locking bolt including a bolt body, a diameter-expanding member, and a contact piece. The bolt body has a shaft hole at the rear end portion of the shaft core portion, and an end of the shaft hole. The portion is formed so as to be a frustoconical space that is wider toward the tip, and the diameter-expanding member is disposed in the space of the bolt body, and abuts against the inner wall of the space to expand the space. The contact piece has a frustoconical side surface having a diameter, and a contact piece insertion hole is formed in an axial center portion thereof. The contact piece is inserted into the contact piece insertion hole of the diameter-expanding member, and the insertion protrusion A loosening bolt characterized in that a perpendicular flange portion is formed.

  Further, the locking bolt of the present invention is a locking bolt comprising a bolt body, a diameter-expanding member, and a contact piece. The bolt body has a shaft hole at the rear end portion of the shaft core portion, and the shaft hole. The end portion of the bolt is formed so as to be a frustoconical space that is widened toward the tip, and the diameter-expanding member is disposed in the space of the bolt body, and abuts against the inner wall of the space. And a bottomed contact piece insertion hole is formed at the large diameter end of the shaft core, and the contact piece is inserted into the bottomed piece of the diameter-enlarged member. An anti-loosening bolt having an insertion convex portion to be inserted into the hole, the insertion convex portion being longer than the length (depth) of the bottomed insertion hole.

In addition, in the locking bolt of the present invention, it is preferable that one or more slits are formed from the rear end of the bolt body in which the truncated cone space is formed.
In the locking bolt of the present invention, one or more slits are formed from the rear end of the bolt body in which the truncated cone space is formed, and the width of the slit is a predetermined length from the rear end. It is preferable that the width of the slit base portion (terminal portion) is wider than the slit width.

  According to the present invention, when a diameter-enlarging member is attached to the truncated conical space at the rear end portion of the bolt body, and a locking bolt with a piece abutting against the abutting piece insertion hole of the diameter-enlarging member is screwed to the bottomed fastening object When the contact piece arrives at the bottom of the object to be fastened and the bolt is further tightened, the diameter-expanding member is pushed into the bolt body space through the contact piece, and the space of the bolt body is expanded. Therefore, the male screw portion of the bolt is firmly coupled to the female screw portion of the fastened object. Therefore, the locking bolt according to the present invention has an excellent effect that does not loosen over a long period of time against environmental changes such as expansion / contraction and vibration due to temperature changes.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the volt | bolt of 1st Embodiment, (a) is a top view of an enamel set, (b) is the side view, (c) is the bottom view, (d) is the XX line shown to (a). Sectional drawing, (e) is a sectional view of a diameter-expanding member, and (f) is a sectional view of a contact piece. It is a partial cross-section explanatory drawing which shows the use condition of the volt | bolt of 1st Embodiment. It is a figure which shows the volt | bolt of 2nd Embodiment, (a) is a top view of an enamel set, (b) is the side view, (c) is the bottom view, (d) is the XX line shown to (a). Sectional drawing, (e) is a sectional view of a diameter-expanding member, and (f) is a sectional view of a contact piece. It is a partial cross-section explanatory drawing which shows the use condition of the volt | bolt of 2nd Embodiment. It is a figure which shows the volt | bolt of a comparative example, (a) is a top view of an enamel set, (b) is the side view, (c) is the bottom view, (d) is XX sectional drawing shown to (a) (E) is sectional drawing of a diameter-expanding member, (f) is sectional drawing of a hit piece. It is a partial cross section explanatory view which shows the use condition of the volt | bolt of a comparative example. It is sectional drawing which shows the conventional locking bolt.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings.

[First Embodiment]
A first embodiment in which the present invention is used as an enamel set will be described.
1 and 2 show a first embodiment in which the present invention is used as an enamel set.

The bolt body will be described.
FIG. 1 shows a locking bolt (hollow set). The hollow set 10 includes a bolt body 11, a contact piece 21, and a diameter expanding member 31.
1A is a top view of an enamel set, FIG. 1B is a side view, FIG. 1C is a bottom view, FIG. 1D is a cross-sectional view taken along line XX shown in FIG. Sectional drawing (f) is a sectional view of a hit piece.

  The bolt body 11 is a rod-shaped hexagon socket set screw having a spiral groove (male thread portion) 14 engraved on the outer periphery, and a hexagonal recess 16 serving as a tool system joint is formed on the top surface of the head. Has been.

A shaft hole 15 is provided in the shaft core portion of the bolt body 11 so as to be continuous with the recess 16. The role of the shaft hole 15 will be described later. A rear end portion (opposite side of the head portion) of the shaft hole 15 is provided with a truncated truncated cone-shaped space 17 (hereinafter referred to as a truncated cone-shaped space 17) that is wider toward the rear end.
One or more slits 18 are provided at the end of the shaft portion 13 where the frustoconical space 17 is formed from the tip to the head. The number of slits is suitably about 1 to 6 depending on the thickness of the bolt.
The slit 18 preferably has a slit 181 having the same width from the tip to a predetermined length, and the slit base portion (terminal portion) 189 is preferably wider than the slit width 181.

The diameter expanding member will be described.
The diameter-expanding member 31 is inserted into the frustoconical space 17 provided in the bolt body 11 and plays a role of expanding the rear end shaft portion of the bolt body 11 outward.
The diameter-expanding member 31 has a truncated cone shape as shown in FIG. The side surface 32 of the diameter-expanding member 31 is formed in a truncated frustoconical shape that eliminates the top of the cone in accordance with the inclination angle of the frustoconical space 17 provided in the bolt body 11. The diameter-expanding member 31 has a frustoconical part at least in part, and the frustoconical side surface 32 abuts exclusively on the side surface of the space 17 to expand the diameter of the space 17. Just do it.
A contact piece insertion hole 33 for inserting a contact piece 21 to be described later is formed in the shaft core portion of the diameter-expanding member 31. The contact piece insertion hole 33 may be a bottomed hole or a through hole.

As shown in the figure, the hit piece 21 described for the hit piece includes an insertion convex portion 23 to be inserted into the shaft hole 33 of the diameter-expanding member 31, and a flange formed integrally with the convex portion 23 and in contact with the bottom surface of the diameter-expanding member. Part 24. In addition, it is preferable that the bottom shape of the flange portion 24 is a flat tip, a sharp tip, a rod tip, a hollow tip, a round tip, or the like depending on the shape and fixing of a mechanical part to be contacted and positioning means.

The assembly of the bolt will be described.
Next, the assembly of the bolt in this embodiment will be specifically described.
First, the diameter-expanding member 31 is fitted into the frustoconical space 17 of the bolt body 11. At this time, it is preferable that the diameter-expanding member is tightly fitted so as not to fall from the bolt body. Next, the convex portion 23 of the contact piece 21 is fitted into the contact piece insertion hole 33 of the diameter increasing member. By making the inner diameter of the contact piece insertion hole 33 of the expanded diameter member substantially coincide with the outer diameter of the convex portion 23, the contact piece 21 can be attached to the expanded diameter member 31 and will not fall.
In this assembly, first, the piece 21 may be assembled to the diameter-expanding member 31, and then the diameter-expanding member may be incorporated into the bolt body.
In addition, in the above description, the bolt body, the diameter-expanding member, and the example of use in a state where the contact piece is fixed so as to be fixed have been described. Of course, it can also be used in combination.

  In this embodiment, the bolt body 11, the contact piece 21, and the diameter-expanding member 31 are preferably made of a metal such as iron or stainless steel, but can also be made of a hard plastic having sufficient rigidity.

The usage state will be described.
An example in which machine parts and the like are fixed (positioned) with the bolt 10 of this embodiment will be described.
FIG. 2 shows a state in which the machine part 52 is fixed to the machine 51 with the bolt 10 of the present embodiment.
As described above, the bolt 10 in which the diameter-expanding member 31 and the contact piece 21 are incorporated in the bolt body 11 is screwed into the screw hole 53 of the machine 51 equipped with the fixed machine part 52. Thus, by screwing the bolt 10 into the screw hole 53 of the machine 51, the tip 25 of the contact piece 21 comes into contact with the machine part 52. Therefore, when the bolt 10 is further rotated in the direction of tightening the machine part 52 with a rotary tool (for example, a hexagon wrench), the flange portion 24 of the contact piece 21 comes into contact with the bottom surface of the diameter expansion member 31, and the diameter expansion member 31 is in a truncated cone space. Push into 17. When the diameter-expanding member 31 is pushed into the frustoconical space, the stress on the side surface 32 of the diameter-expanding member is applied to the space 17, and the space 17 is provided with a slit 18, so that the space 17 is pushed outward. The diameter of the lower part of the shaft of the bolt body 11 is increased. When the diameter of the shaft portion 13 is increased, the spiral groove (male thread portion) 14 is firmly brought into contact with the thread portion (spiral groove) of the screw hole 53 of the machine.

  By tightening the bolt 10 so as to press the mechanical component 52 in this way, the spiral groove (male thread part) 14 of the bolt is firmly in contact with the spiral groove (female thread part) of the screw hole 53 and the bolt 10 is removed. Even if it rotates, the bolt 10 cannot be loosened with the force of the tightened tool. If the machine part 52 is fixed with the bolt 10 in this way, the bolt will not loosen over a long period of time even under severe environments such as expansion / contraction and vibration due to temperature changes.

  As described above, in this embodiment, the machine part 52 is fixed with the bolt 10. However, it may be necessary to remove this fixation in some cases. To remove the bolt, prepare a tool with a stronger force than the rotating tool when the bolt is tightened, and forcefully rotate it in the direction that the bolt loosens. If the bolt rotates even in the loosening direction, a rod-shaped body is inserted from the shaft hole 15 provided in the bolt main body 11 and the head of the diameter expanding member 31 is hit, and the diameter expanding member 31 is removed from the bolt main body 11. By removing the expanded member from the bolt body, the bolt can be easily rotated and removed.

[Second Embodiment]
A second embodiment in which the present invention is used as an enamel set will be described.
3 and 4 show a second embodiment in which the present invention is used as an enamel set.

FIG. 3 shows a locking bolt (hollow set) 110, which is composed of a bolt body 11, a contact piece 121, and a diameter expanding member 131.
3A is a top view of the enamel set, FIG. 3B is a side view, FIG. 3C is a bottom view, FIG. 3D is a cross-sectional view taken along line XX shown in FIG. Sectional drawing (f) is a sectional view of a hit piece.

  Since the bolt body 11 has the same structure as that of the first embodiment, the same reference numerals are given to the drawings, and detailed description thereof is omitted.

The expanded diameter member will be described.
The diameter-expanding member 131 is inserted into the truncated cone space 17 provided in the bolt body 11 and plays a role of expanding the rear end shaft portion of the bolt body 11 outward.
The diameter-expanding member 131 has a truncated cone shape as shown in FIG. The side surface 132 of the diameter-expanding member 131 is formed into a truncated frustoconical shape that matches the inclination angle of the frustoconical space 17 provided in the bolt body 11. The diameter-expanding member 131 has a frustoconical portion at least in part, and the frustoconical side surface 132 abuts exclusively on the side surface of the space 17 so as to expand the diameter of the space 17. Just do it.
A bottomed contact piece insertion hole 133 into which a contact piece 121 described later is fitted is formed in the shaft core portion of the diameter-expanding member 131.

The hit piece 121 described for the hit piece is a rod-shaped part that is inserted into the bottomed piece insert hole 133 of the diameter-expanding member 131 as shown in the figure. The length of the contact piece 121 is designed to be longer than the depth (length) of the bottomed piece insertion hole 133 of the diameter-expanding member 131.
Note that the end shape of the tip 125 of the contact piece 121 is a flat tip, a pointed tip, a rod tip, a hollow tip, a round tip, or the like according to the fixing and positioning of the abutting machine part or the like.

The assembly of the bolt will be described.
Next, the assembly of the bolt in the present embodiment will be specifically described.
First, the diameter expanding member 131 is fitted into the truncated cone space 17 of the bolt body 11. At this time, it is preferable that the diameter-expanding member is tightly fitted so as not to fall from the bolt body. Next, the contact piece 121 is fitted into the piece insertion hole 133 with the bottomed contact of the diameter expanding member. By making the inner diameter of the bottomed piece insertion hole 133 of the expanded diameter member substantially coincide with the outer diameter of the contact piece 121, the contact piece 121 can be attached to the expanded diameter member 131 and will not fall.
In this assembly, the piece 121 may be first assembled to the diameter-expanding member 131 and then incorporated into the bolt body 11.
In addition, in the above description, the bolt body, the diameter-expanding member, and the example of use in a state where the contact piece is fixed so as to be fixed have been described. Of course, it can also be used in combination.

  In this embodiment, the bolt body 11, the contact piece 121, and the diameter-expanding member 131 are preferably made of a metal such as iron or stainless steel, but can also be made of a hard plastic having sufficient rigidity.

The usage state will be described.
An example of fixing (positioning) a machine part or the like with the bolt 110 of this embodiment will be described.
FIG. 4 shows a state in which the machine part 52 is fixed to the machine 51 with the bolt 110 of the present embodiment.
As described above, the bolt 110 in which the diameter expanding member 131 and the contact piece 121 are incorporated in the bolt body 11 is screwed into the screw hole 53 of the machine 51 equipped with the fixed machine part 52. In this way, the bolt 125 is screwed into the screw hole 53 of the machine 51 so that the tip 125 of the contact piece 121 comes into contact with the machine part 52. Therefore, when the bolt 110 is further rotated in the direction of tightening the mechanical component 52 with a rotary tool (for example, a hexagon wrench), the contact piece 121 hits the bottom of the bottomed piece insertion hole 133 of the diameter expansion member 131 and the diameter expansion member 131 is moved. Push into the frustoconical space 17. When the diameter-expanding member 131 is pushed into the frustoconical space, the stress on the side surface 132 of the diameter-expanding member 131 is applied to the space 17, and the space 17 is pushed outward because the slit 17 is provided in the space 17. The diameter of the lower part of the shaft of the bolt body 11 is increased. When the diameter of the shaft portion 13 is increased, the spiral groove (male thread portion) 14 is firmly brought into contact with the thread portion (spiral groove) of the screw hole 53 of the machine.

  By tightening the bolt 110 so as to press the mechanical part in this manner, the spiral groove (male thread part) 14 of the bolt firmly contacts the spiral groove (female thread part) of the screw hole 53 and rotates in a direction to remove the bolt 110. Even so, the bolt 110 cannot be loosened with the force of the tightened tool. If the machine part 52 is fixed with the bolt 110 in this way, the bolt will not loosen over a long period of time even under a severe environment such as expansion / contraction due to a temperature change, vibration.

  As described above, in this embodiment, the mechanical component 52 is fixed with the bolt 110. However, it may be necessary to remove this fixation in some cases. To remove the bolt, prepare a tool with a stronger force than the rotating tool when the bolt is tightened, and forcefully rotate it in the direction that the bolt loosens. If the bolt rotates even slightly in the loosening direction, a rod-shaped body is inserted from the shaft hole 15 provided in the bolt main body 11, the head of the diameter expanding member 131 is hit, and the diameter expanding member 131 is removed from the bolt main body 11. Can be easily removed.

[Comparative Example]
A comparative example will be described for a bolt used as an enamel set.

  FIG. 5 shows a locking bolt (hollow set) 210, which is composed of a bolt body 11 and a diameter-expanding member 31.

  This comparative example has a structure in which the contact piece 21 is removed from the bolt 10 of the first embodiment, and the bolt main body 11 and the diameter-expanding member 31 exhibit the same functions as those of the first embodiment. Reference numerals are assigned and detailed description is omitted.

The assembly and use state of the bolt will be described.
FIG. 6 shows a state in which the machine part 52 is fixed to the machine 51 with the bolt 210 of the comparative example.
The assembly of the bolt 210 will be specifically described.
First, the diameter-expanding member 31 is fitted into the frustoconical space 17 of the bolt body 11.
Next, the bolt 210 in which the diameter increasing member is incorporated in the bolt main body is screwed into the screw hole 53 of the machine 51 equipped with the fixed machine part 52. In this way, by screwing the bolt 10 into the screw hole 53 of the machine 51, the tip of the diameter expanding member 31 comes into contact with the machine part 52. Therefore, when the bolt 10 is further rotated in the direction of tightening the machine part 52 with a rotary tool (for example, a hexagon wrench), the tip of the diameter-expanding member 31 hits the machine part and pushes the diameter-expanding member 31 into the frustoconical space 17.
By tightening the bolt 110 so as to press the mechanical parts in this manner, the spiral groove (male thread part) 14 of the bolt firmly contacts the spiral groove (female thread part) of the screw hole 53 and rotates in a direction to remove the bolt 110. Even so, the bolt 110 cannot be loosened with the force of the tightened tool.

〔judgment result〕
As described above, in the comparative example, the diameter-expanding member 31 is directly brought into contact with the machine part, and the diameter-expanding member is pushed into the truncated cone space of the bolt body. Therefore, depending on the shape of the machine part, the expanded member may be pushed into the frustoconical space while being rotated, the expanded member will not be smoothly pushed into the space (engaged), and the machine part cannot be firmly fixed. Alternatively, the bolt may not be fixed without loosening. Therefore, it is dangerous to use the bolt of the comparative example as a general-purpose product, resulting in forced order production.

  On the other hand, the locking bolt of the present invention does not directly contact the diameter-expanding member and the machine part, but has a contact piece interposed. Since the rotation when the bolt is rotated and pushed by interposing the contact piece is absorbed by the contact piece and the diameter expansion member is not rotated, the diameter expansion member is smoothly inserted into the truncated cone space, and the bolt body The end part of this is pushed open and bites into the threaded hole of the mechanical device, so that the function of preventing loosening is fully exhibited.

  As mentioned above, although this invention was demonstrated by embodiment, the volt | bolt main body, contact piece, and diameter-expansion member which were demonstrated by each embodiment are not limited to the said embodiment, The bolt fastening method of a structure which has a bottomed screw hole, enamel It goes without saying that various modifications can be made without changing the gist of the present invention, such as a tightening bolt having a head, not a set, or a connecting bolt.

DESCRIPTION OF SYMBOLS 10 Bolt 11 Bolt main body 13 Bolt shaft part 14 Spiral strip 15 Shaft hole 16 Head recessed part 17 Rear end space 18 Slit 21 Hit piece 23 Insertion convex part 24 Flange part 31 Diameter expansion member 32 Frustum side surface 33 Hit piece insertion hole 110 bolt 121 piece per 121 123 convex part 51 machine 52 machine part

Claims (2)

It is a locking bolt consisting of a bolt body, a diameter expanding member, and a contact piece,
The bolt body is formed so that a shaft hole is formed at a rear end portion of the shaft core portion, and becomes a frustoconical space widened as the end portion of the shaft hole is closer to the tip end,
The diameter-expanding member is disposed in the space of the bolt body, has a truncated cone-shaped side surface that abuts against the inner wall of the space and expands the space, and an insertion hole for inserting the abutting piece into the shaft core portion Is formed,
The contact piece is a loosening prevention bolt in which an insertion convex portion to be inserted into the insertion hole of the diameter-expanding member and a flange portion perpendicular to the insertion convex portion are formed. It is a locking bolt consisting of a bolt body, a diameter expanding member, and a contact piece,
The bolt body is formed so that a shaft hole is formed at a rear end portion of the shaft core portion, and becomes a frustoconical space widened as the end portion of the shaft hole is closer to the tip end,
The diameter-expanding member is disposed in the space of the bolt body, has a frustoconical side surface that abuts against the inner wall of the space and expands the space, and contacts the large-diameter side end of the shaft core portion. A bottomed insertion hole to insert the piece is formed,
The contact piece includes an insertion portion that is inserted into the bottomed insertion hole of the diameter-expanding member, and the insertion portion is a locking bolt that is formed longer than the length (depth) of the bottomed shaft hole.

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