JPH05321921A - Bolt equipped with locking - Google Patents

Abstract

PURPOSE:To prevent loosening of a bolt in simple work by composing a bolt of a containing aperture part having a slit extended axially to a shaft end part, and a deformation wedge protruding axially out from a bolt output end at one end, and contained in the containing aperture part at the other end. CONSTITUTION:A bolt main body 1 is rotated to be threaded into a screw hole 3, and a protruding end part 9 of a deformation wedge 2 protruded partly from a shaft end of the bolt main body 1 is applied to a bottom 10 of the screw hole 3. By further threading it, engagement of an engagement part 7 of a containing aperture part 5 with an engagement part 8 of the deformation wedge 2 is released, and the deformation wedge 2 is press fitted in toward a head of the bolt main body 1. The deformation wedge 2 thus generates force to push a shaft end part 4 of the bolt main body 1 outward. A thread 11 in an outer surface of the shaft end part 4 bites a thread 12 in the screw hole 3, and the bolt main body 1 is mechanically strongly bound to the screw hole 3 to prevent generation of loosening of the bolt main body 1. A slit 6 facilitates partial deformation of the shaft end part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt mainly used for semi-permanent fixing, and more particularly to a bolt with a locking device suitable for use in a place where mechanical vibration or the like is applied.

[0002]

BACKGROUND OF THE INVENTION As is well known, bolts are a convenient means for joining articles and are widely used in a very wide field. On the other hand, for the articles to be joined, the bolt is a means that can be easily joined and separated, but has a drawback that it is easily loosened by mechanical vibration or the like.

In order to prevent this loosening, a spring
Washers are used and double nuts are used. However, when mechanical vibrations, especially vibrations of small amplitude, are continuously applied, they gradually become loose, although gradually, to the extent that they require additional tightening.

Further, in recent years, a chemical agent for filling a gap between screw threads to prevent loosening has been marketed, and it has been confirmed that it is effective for preventing loosening. However, even if this chemical agent is used, there is almost no effect when vibration is strongly applied with a small amplitude, and it is currently used only in a limited field.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bolt with a lock for preventing loosening of the bolt by a simple operation.

[0006]

SUMMARY OF THE INVENTION A locking bolt according to the present invention has at least one axially extending axial end extending in a central axis direction.
A bolt main body having a housing opening having two slits, and a deforming wedge whose one end projects outward from the axial end of the bolt main body in the central axial direction and the other end of which is received in the housing opening. It

The lock bolt according to the invention also comprises
A convex portion and / or a concave portion is formed on the outer surface of the deforming wedge, and the accommodating opening portion of the bolt body is tapered so that the diameter gradually decreases from the shaft end toward the head portion, and the accommodating opening portion is formed. The inner peripheral surface may be provided with an engaging member for engaging with the engaging member of the deforming wedge and holding the deforming wedge in the accommodation opening.

[0008]

The lock bolt according to the present invention is used by being screwed into a blind bolt hole or a screw hole of a bottomed nut. When the bolt body is screwed in, first, the tip of the deformation wedge protruding from the shaft end of the bolt body is joined to the bottom of the screw hole. Further, by screwing the bolt main body, a force is generated that the deformation wedge pushes the side wall of the accommodation opening of the bolt main body outward in a direction orthogonal to the central axis direction. As a result, the bolt body partially deforms at the shaft end portion provided with the slit, whereby the thread at the shaft end portion of the bolt body meshes with the thread of the bolt hole and prevents the bolt body from loosening. .

The direction of the force generated by the movement of the deformable wedge is such that the tapered housing opening of the bolt body directs the axial end of the bolt body to the outside. Further, the deformation wedge is held at the axial end position of the bolt body by the local connection with the bolt body, and is prevented from being unnecessarily dropped.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lock bolt according to an embodiment of the present invention, as shown in FIG. 1, is composed of a bolt body 1 and a deforming wedge 2, and is screwed into a blind bolt hole or a screw hole 3 of a bottomed nut. Is used.

The bolt body 1 has a housing opening 5 at the shaft end 4, and the housing opening 5 is formed so as to communicate with at least one slit 6 that partially extends from the shaft end in the central axis direction. ing. The receiving opening 5 is also provided in the form of a tapered hole whose internal dimension is gradually reduced from the axial end 4 of the bolt body towards the head. The deformation wedge 2 has a corresponding size and shape so as to be accommodated in the accommodation opening 5, and one end thereof is formed so as to appropriately project from the axial end of the bolt body 1.

Here, the size and shape of the deformation wedge 2 are
What is the size and shape that can generate a force that partially deforms the shaft end portion 4 of the bolt body 1, more preferably a force that widens outward when the bolt is screwed in, which will be described later. It can be applied to various shapes.

The housing opening 5 and the slit 6 may be of any size and shape as long as they can partially deform the shaft end 4 of the bolt body 1 described above. However, the accommodation opening 5 and the slit 6 are provided to substantially partially weaken the shaft end portion 4 of the bolt body 1, and if the size and shape of these are excessively large, the bolt itself is weakened. However, if it is too small, partial deformation will be insufficient, and the meshing of the threads described below will be insufficient and loosening will occur easily. Therefore, the size and shape of the accommodation opening 5, and the size and shape and the number of the slits 6 should be appropriately selected according to the material and size of the bolt to be produced.

On the inner peripheral surface of the accommodation opening 5 of the bolt body,
As shown in more detail in FIG. 2, an engaging portion 7 in the shape of a concave portion and / or a convex portion (a concave portion in the case shown) is formed, and the outer peripheral surface of the deforming wedge 2 is provided with the accommodation opening portion 5. An engaging portion 8 having a shape complementary to the engaging portion 7 (a convex portion in the illustrated case) is provided.

Regarding the positional relationship between the engaging portion 7 of the accommodation opening 5 and the engaging portion 8 of the deformable wedge 2, the deformable wedge 2 is in the bolt body 1.
It is selected so as to maintain the relative positional relationship in a state in which no deformation action is exerted on. However, the engagement between the two engaging portions 7 and 8 is intended only to prevent the deformation wedge 2 from falling off from the bolt body 1 before use, and when the bolt is screwed in, which will be described later. The engagement relationship between the two needs to be configured so as to be easily disengaged.

The bolt of the present invention constructed as described above is
Similarly to a well-known bolt, the bolt body 1 is rotated and screwed into the screw hole 3, and the protruding end portion 9 of the deformation wedge 2 partially protruding from the shaft end of the bolt body 1 has a bottom 10 of the screw hole 3. To join. Then, by further screwing, the engagement between the engaging portion 7 of the accommodation opening 5 and the engaging portion 8 of the deforming wedge 2 is released, and the deforming wedge 2 moves in the direction of arrow A into the bolt body 1 It is pressed in toward the head. As a result, the deformation wedge 2
Generates a force that pushes the shaft end portion 4 of the bolt body 1 outward as indicated by an arrow B.

As the shaft end portion 4 of the bolt body 1 spreads outward, the screw thread 11 formed on the outer surface of the shaft end portion 4 is pushed into the screw thread 12 of the screw hole 3. And the screw hole 3 are mechanically strongly coupled to each other to prevent loosening of the bolt body. At this time, the slit 6 acts to facilitate partial deformation of the shaft end portion 4 of the bolt body 1.

[0018]

According to the present invention, when the bolt is attached to the screw hole, the deforming wedge causes a partial deformation of the bolt body at the shaft end portion provided with the slit of the bolt body. It is possible to prevent the loosening of the bolt from occurring because the screw thread at the shaft end portion is engaged with the screw thread of the screw hole.

Further, since the shape of the inner peripheral surface of the accommodation opening of the bolt body is tapered, the force generated by the movement of the deformation wedge is reliably directed in the direction in which the shaft end of the bolt body is expanded outward. Since the slits can facilitate the partial deformation, the threads can be more reliably meshed with each other.

Further, since the engaging means is provided between the inner surface of the accommodation opening and the outer surface of the deforming wedge, the deforming wedge is detached before use and the loosening preventing effect cannot be exerted. It can be surely prevented.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing an embodiment according to the present invention.

FIG. 2 is an enlarged partial sectional view of what is shown in FIG.

[Explanation of symbols]

 1 Bolt body 2 Deformation wedge 3 Screw hole 5 Housing opening 6 Slit 7, 8 Engagement part

Claims (2)

[Claims] 1. A bolt main body having a shaft end having a housing opening having at least one slit extending in the central axis direction, and one end protruding outward from the axial end of the bolt main body in the central axial direction and the other end. A bolt with locking device, characterized in that it comprises a deforming wedge that is received in the accommodation opening. 2. An engaging portion is formed on the outer surface of the deformable wedge, and the accommodating opening of the bolt body is tapered so that the diameter gradually decreases from the shaft end toward the head, and the accommodating opening is accommodated. The engagement portion for engaging with the engagement portion of the deformation wedge to hold the deformation wedge in the accommodation opening portion is provided on the inner peripheral surface of the opening portion. Bolts with locks described.