JP2013245817A - Fastening device of bolt and nut combined therewith that never come loose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening device of a bolt and nut, which is simple in structure, easy in manufacture, and never comes loose.SOLUTION: A reverse screw having an outer diameter smaller than the inner diameter of a nut for fastening is provided to the shaft of a bolt for fastening on the opposite side of the head portion thereof. A reverse screw nut for preventing the nut for fastening from loosening is attached to the reverse screw. Consequently, the nut for fastening is prevented from loosening.

Description

  The present invention relates to bolts and nuts for fastening a plurality of members mainly in the field of mechanical devices and structures.

  When tightening a member to be fastened with bolts and nuts, if there is a possibility that the bolts and nuts may loosen due to slight vibrations or repeated external force applied around the bolt axis, the industry prevents loosening Nuts with functions are widely used and have achieved considerable results. However, many of the locking nuts currently in use have a complicated structure and require advanced techniques for production. No simple structure is known in which the loosening of the fastening nut is reversed with a reverse screw nut.

  For example, the most widely used nuts are those in which protrusions are incorporated inside the nuts (see Patent Documents 1 and 2 and Non-Patent Document 1). difficult. Non-patent document 2 that the inventor himself wrote, “The uneven shape of the nut is designed with a dimensional tolerance of a micron unit, and unless a special die and a special machine tool devised by the inventor are used, Mass production is difficult. There is a statement to the effect.

Japanese Patent Publication No. 03-000526 Patent 4495849

35 pages of "" Never loose screw "subtitle" How to make a small company the best in the world "by Katsuhiko Wakabayashi, published on March 3, 2011

Non-Patent Document 1, pages 191 to 192

  We develop a fastening device that combines bolts and nuts that are easy to manufacture with a simple structure and that completely prevent loosening even when a strong loosening torque acts on the bolts and nuts.

  In the present invention, the bolt shaft is threaded in the direction opposite to the screw on the bolt head side on the opposite side of the bolt head, and the nut to be fastened is attached. By tightening, the fastening nut on the head side is completely prevented from loosening.

  By completely preventing the fastening nuts from being loosened, it is possible to reduce the labor and cost of maintenance by reducing the inspection and tightening work of the fastening parts.

  The loosening-fastening device combining bolts and nuts according to the present invention has a simpler structure compared to the conventional locking device that combines bolts and nuts. Anyone who has technology can easily and inexpensively manufacture it.

It is sectional drawing of the example which shows the Example of this invention.

  In the present invention, the bolt shaft is threaded in the direction opposite to the bolt head screw, and the bolt head is attached to the bolt head. After that, the fastening nut is tightened with a reverse screw nut to completely prevent the fastening nut from loosening.

  Embodiments will be described below with reference to the accompanying drawings.

  In FIG. 1, reference numeral 1 denotes a bolt for fastening the first fastened member 2 and the second fastening member with a right-hand screw nut, and the screw diameter from the inner diameter of the fastening nut is opposite to the head of the bolt shaft. Is provided with a small reverse screw (for example, if the screw for fastening the member to be fastened is an M16 right screw, the left screw of M14 is on the opposite side of the bolt head). After the member to be fastened is fastened by the fastening nut 5, a washer-like spacer 6 having an appropriate thickness is attached, and then the nut 5 is fastened by the reverse screw nut 7 in order to prevent the fastening nut 5 from loosening. It has been. Even if a loosening torque is applied to the fastening nut 5, if the reverse screw nut 7 is in a position where the nut 5 is tightened (hereinafter, this position is abbreviated as “predetermined position”), the nut 7 will loosen the nut 5. Is completely blocked.

  If the nut 7 is in a predetermined position, even if a strong loosening torque acts on the bolt or the nut 5, the loosening of the nut 5 is completely prevented by the reverse screw nut 7. However, when there is slight vibration even when a strong loosening torque is not applied to the bolt or the nut 5, the nut 7 itself may be loosened and come out of a predetermined position. If the nut 7 is disengaged from the predetermined position, the nut 7 cannot exhibit the desired loosening prevention effect when a strong loosening torque acts on the nut 5. When there is such a possibility, it is already widely known that the nut 7 is a locking nut, a combination of a spring washer and a double nut, and an adhesive tape is wound around the nut 7 and the bolt shaft after the nut 7 is tightened. The selected method can be selected and used according to the usage conditions of the bolt and nut.

DESCRIPTION OF SYMBOLS 1 Bolt 2 1st to-be-fastened member 3 2nd to-be-fastened member 4 Washer 5 Nut for fastening 6 Washer-like spacer 7 Nut locking reverse screw nut

Claims (1)

  On the opposite side of the head of the fastening bolt shaft, apply a reverse screw whose outer diameter is smaller than the inner diameter of the fastening nut, and attach a reverse screw nut to the reverse screw to prevent the fastening nut from loosening. Fastening device for bolts and nuts.

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