JPH0685920U - Fastener with screw loosening prevention function - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fastener with a screw loosening prevention function, which can completely prevent loosening of the nut screw even by violent vibration and the like, and which can also easily perform fastening work for fastening the fixing member. . [Structure] The bolt shaft is formed in a polygonal shape, and a male screw is cut from an appropriate position to form a bolt body, while the inner wall portion is formed in a polygonal shape that conforms to the polygonal shaft portion. It is characterized in that a nut body is formed by cutting a female screw on an inner wall portion, and a locking body for integrally locking and fixing both adjacent nuts is provided at the time of tightening the nut so that the nut body does not rotate. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention prevents bolts (including screws) and nuts from loosening due to vibrations, etc. Fastening with a loosening prevention function that is ideal for fastening and fixing various members in vehicles, machine tools, etc. It is about ingredients.

[0002]

[Prior art]

 Generally, as a means for preventing loosening of nuts, there are lock nuts, spring washers, setscrews, pins, split pins, etc.The lock nuts can be loosened by inserting them between a normal nut and a fixing member. It is used for fastening and fixing various members frequently.

[0003]

[Problems to be solved by the device]

 However, in the case of the above lock nut, the nut may inevitably loosen due to vibration, etc., so periodic inspection and tightening are necessary, and it cannot be said to be a perfect loosening prevention means. In addition, since the total height of the nut and the lock nut protrudes from the fixing member, it is more protruding than usual.

The present invention has been made in view of the above points, and it is possible to completely prevent the nut from loosening due to severe vibration and the like, and the fastening work for fastening and fixing the fixing member is simple. It is also an object of the present invention to provide a fastener with a screw loosening prevention function, which can be considerably lower than the conventional protruding height when a lock nut is used.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the fastener of the present invention is such that the bolt shaft portion is polygonal and the male screw is cut from an appropriate position to form the bolt body, while the inner wall portion is polygonal. The nut body is formed by cutting the inner wall with a shaped nut body and a female screw that matches the male screw, and provides a locking body that integrally locks and fixes both adjacent nuts when tightening the nut. It is characterized in that it does not rotate and move.

[0006]

[Action]

 As described above, according to the fastener of the present invention, the shaft portion of the bolt body is inserted into the bolt hole (insertion hole) of the target member to be fastened, and first, the nut having the polygonal inner wall conforming to the polygonal shaft portion. Insert the main body, then firmly tighten the nut main body with the female screw cut into the male screw of the shaft portion, and tighten the bolt head and both nut main bodies to fix the target member. In this state, the nut main body having the polygonal inner wall is clamped and fixed between the target member and the nut main body having the female screw portion, and the inner wall of the nut main body and the shaft portion of the bolt main body are polygonal and conform. The nut body does not rotate with respect to the shaft. If left as it is, there is a risk that the nut body having the female screw portion will rotate in the opposite direction due to vibration and the like, and the screw may loosen. Here, if the nut body of the non-rotating polygonal inner wall and the nut body of the female screw inner wall that may rotate are integrally locked and fixed by the locking body, the latter nut body will rotate. Nothing happens, and you can completely prevent the screws from loosening.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 3 is a sectional side view showing a usage state of the present invention.

In the drawings, reference numeral 1 denotes a bolt main body, which has a screw head 1a at one end, forms a shaft portion 1b in a hexagonal prism shape, and cuts a male screw from an appropriate position to provide a male screw portion 1c. It is a digit. The position of thread cutting is determined by the thickness of the member A to be fastened and fixed. The whole or a part of the nut body 2 described later is located on the shaft portion 1b, and the nut body 3 is mounted on the male screw portion 1c. It is assumed that the lengths of the shaft portion 1b and the male screw portion 1c are set so that the target member A is fastened at the position.

The nut body 2 is a screwless nut in which the inner wall portion 2 a is formed in a hexagonal shape so as to fit the shape of the shaft portion 1 b of the bolt body 1. When positioned at 1b, the outer peripheral surface of the shaft portion 1b and the inner wall surface of the nut body 2 abut one by one, so that the nut body 2 does not rotate laterally. The outer wall portion 2b of the nut body 2 has a hexagonal shape like a normal nut.

The nut body 3 has a hexagonal nut in which an inner wall portion 3 a is cut with a female screw adapted to the male screw portion 1 c of the bolt body 1, and the outer wall portion 3 b has the same hexagonal shape as the outer wall portion 2 b of the nut body 2. The outer diameter is the same as that of the nut body 2.

In this embodiment, the shape of the shaft portion 1b of the bolt body 1 and the inner wall portion 2a of the nut body 2 is hexagonal, but it may be polygonal such as quadrangular and each nut body. The outer wall portions 2b and 3b may also have another polygonal shape, and the polygonal shape is not particularly limited.

Reference numeral 4 denotes a locking body, which is a member for integrally locking and fixing the nut body 3 and the adjacent nut body 2 when the nut body 3 is tightened, and does not rotate the nut body 3. By integrating with the nut body 2, the rotation of the nut body 3, that is, the slack of the screw is prevented. In the present embodiment, the rubber hollow tube (smaller than both nuts) is placed over both nuts so that they are integrated. However, the nuts are integrally attached by winding a gum tape or the like. It may be fixed and fixed.

It should be noted that the nut body 2 may be a two-stage upper and lower nut, and the outer diameter of the nut on the fixing member A side may be formed to be slightly smaller. Since the tip of the body 4 contracts and is caught by the small diameter nut portion, the locking condition of the locking body 4 can be improved. Even if the nut body 2 is a single body, the same effect can be obtained by forming the nut upper part (tip side) to have a smaller diameter than the lower part.

[0015]

[Effect of device]

 As described above, according to the present invention, unlike the conventional lock nut, it is possible to completely prevent the loosening of the screw of the bolt and nut, and once tightened and fixed, the locking body is damaged or becomes a locking body. The screw will not loosen until the function of is lost, and the occurrence of an accident due to the looseness of the screw can be avoided. In addition, periodic inspection work is also simple, and tightening and fixing work with this fastener is very easy. Also, it is possible to reduce the thickness of each nut compared to the conventional lock nuts, and it is possible to protrude from members. It is easy to reduce the height and has a great effect on the user. Furthermore, this fastener is most suitable for fastening members related to machines and vehicles that vibrate violently, but is also widely used for fastening other members, and it can be said that its commercial value is very high.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a usage state of the present invention.

FIG. 3 is a sectional side view showing a usage state of the present invention.

[Explanation of symbols]

 1 Bolt body 2 Nut body 3 Nut body 4 Locking body

Claims (1)

[Scope of utility model registration request] 1. A nut main body and a male screw having a polygonal shape for a bolt shaft portion and cutting a male screw from an appropriate position to form a bolt body, and an inner wall portion having a polygonal shape adapted to the polygonal shaft portion. A nut body is formed by cutting a matching female screw on the inner wall, and a locking body that locks and fixes both adjacent nuts integrally when tightening the nut is provided to prevent the nut body from rotating. A fastener with a screw loosening prevention function.