JP2005315363A - Locking nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking nut, inexpensively and easily fastening a material to be fastened. <P>SOLUTION: In this locking nut 1, an anaerobic adhesive 2 is applied to a contact part with the material to be fastened on one side of the nut 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a screw including a bolt and a nut, which is widely used for fastening various members, and more particularly, to a nut with a locking stopper suitable for a case where a fastened object is a metal material.

  Conventionally, in electrical and electronic equipment and the like, fastened objects such as a main body and a case are fastened with screws or the like.

  In FIG. 3, the side view of the state which fastened the to-be-fastened object using the conventional general volt | bolt and nut is shown. In FIG. 3, 4 is a bolt, 5 is a thing to be fastened, and 6 is a nut. As shown in FIG. 3, the objects to be fastened 5 are fastened by inserting a threaded cylindrical shaft portion of the bolt 4 into a through hole provided in the fastened object 5, and protruding from the fastened object 5. This is done by screwing and tightening the nut 6 to the tip of the shaft portion.

  However, when the fastening object 5 is fastened using the conventional bolt 4 and the nut 6, the return rotation of the nut 6 occurs in the direction of the arrow 10 as indicated by the dotted line due to vibration and other causes, and the screw Looseness occurred. This point is cited as a major problem in fastening using screws, and it has been a problem that has been sought in the past to provide a screw with a locking effect.

  As an example of the countermeasure, Patent Document 1 proposes a method in which a screw is made of a shape memory alloy and heated immediately after fastening to deform the thread shape to have a loosening prevention effect.

Japanese Unexamined Patent Publication No. 63-280905

  However, in the case of the above-described conventional example, the material cost of the shape memory alloy is quite expensive, and there is a drawback that the shape memory alloy that is not easy to process must be threaded.

  In the present invention, an object of the present invention is to provide a nut with a locking mechanism that has an effect of preventing the locking, and that can fasten an object to be fastened easily and has improved such drawbacks.

  The present invention is a nut with a locking mechanism characterized in that an anaerobic adhesive is applied to a contact portion with a fastened object on one side of the nut.

  That is, in the present invention, an anaerobic adhesive is applied in advance to the contact surface with the object to be fastened on the nut before fastening. In this way, after the screw is fastened, the anaerobic adhesive is cured by being cut off from the outside air, and acts to prevent loosening.

  As described above, when the nut with a locking according to the present invention is used, the anaerobic adhesive on the contact surface with the body to be fastened on the nut is cured after the screw is tightened, thereby providing a locking effect after the fastening. Can do. In the present invention, since it is not necessary to use a shape memory alloy, it is not expensive, and the shape memory alloy does not need to be processed, so that the object to be fastened can be fastened easily and inexpensively.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a nut with a lock according to the present invention. FIG. 2 is a side view showing a state in which an object to be fastened is fastened together with a general bolt using the nut with a locking bolt of FIG.

  As shown in FIG. 1, the nut 1 with a locking stopper of the present invention is obtained by applying an anaerobic adhesive 2 to a portion that comes into contact with an object to be fastened on the surface (one side) of the nut 6. The whole surface or a part of the surface may be applied, and the thickness, amount, etc. are adjusted as appropriate so that they do not protrude from the interface between the fastening object and the nut 1 with a locking element after fastening. And apply.

  As the anaerobic adhesive, an anaerobic thermosetting adhesive based on an acrylic polymer, chloroprene rubber or ethylene propylene copolymer rubber, a room temperature curable adhesive, or the like can be used. An organic solvent and an aqueous solvent can be used as the medium, but it is preferable to use an aqueous adhesive because of recent environmental pollution and toxicity to human bodies. For example, an adhesive or the like mainly composed of a monomer having an acryloyl group or a methacryloyl group and containing a peroxide and a reducing agent as required.

  Next, the state at the time of use of this nut 1 with a locking stopper will be described with reference to FIG. As shown in FIG. 2, a threaded cylindrical shaft portion 4 a of a general bolt 4 is inserted into a through-hole 5 a provided in the fastened object 5, and the shaft portion 4 a protruding from the fastened object 5 is inserted. The nut 1 with the locking device of the present invention is screwed to the tip and tightened, and the objects 5 to be fastened are firmly fastened between the head 4 b of the bolt 4 and the nut 1 with the locking device.

  That is, when the fastened object 5 is fastened together with the general bolt 4, the anaerobic adhesive applied to the surface of the nut 1 with the locking stopper is hardened to be shielded from the outside air, and becomes a hardened material 3. This prevents the nut 1 with a locking stopper from rotating back. Thereby, generation | occurrence | production of the loosening of this screw and generation | occurrence | production of the to-be-fastened thing by loosening of a screw can be prevented.

  In addition, on the property of anaerobic adhesive, it can be said that it is a desirable form that the material of the to-be-fastened object 5 is a metal material, since an anaerobic adhesive becomes easy to harden | cure.

It is a perspective view which shows the nut with a locking stopper by this invention. The side view which shows the state which fastened the to-be-fastened object with the general volt | bolt using the nut with a locking | loosening prevention of FIG. The side view which shows the state which fastened the to-be-fastened object using the conventional common volt | bolt and nut.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Locking nut 2 Anaerobic adhesive 3 (before hardening) Hardened | cured material 4 Bolt 4a Shaft part 4b Head part 5 Fastened object 5a Through-hole 6 Nut 10 Arrow

Claims (1)

  An anti-loosening nut characterized in that an anaerobic adhesive is applied to a portion of the nut that contacts the object to be fastened.

Images