JP3013040U - Loosening prevention nut - Google Patents

Abstract

(57) [Summary] [Purpose] To improve workability. The nut can be fixed at any position. [Constitution] It is composed of an inner member 11 and an outer member 12. Inner member 1
1 has a tapered male screw portion 14 on the outer circumference, and further has a split groove 16 and a concave groove 17. The outer member 12 is screwed into the tapered male screw portion 14, fitted into the inner member 11, and prevented from coming off. When the outer member 12 is rotated with respect to the inner member 11, the inner member 11 is tightened to prevent loosening.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a loosening prevention nut capable of preventing loosening when a bolt is tightened.

[0002]

[Prior art]

 Conventionally, a method of hardening with a resin, a double nut, and a washer have been widely used as a means for preventing loosening of a nut. The method of solidifying with a resin is poor in workability and easily deteriorates in function due to heat and chemicals, and is particularly inconvenient when detaching. Since double nuts must be rotated separately while pressing each nut against each other, co-rotation is likely to occur, and this operation is extremely troublesome. The spring washer can only be used for tight tightening, it cannot fix the nut in any position.

[0003] Also known are loosening prevention nuts that use pins or caulking, but each has a problem in workability.

[0004]

[Problems to be solved by the device]

 Then, this invention aims at obtaining the loosening prevention nut which is easy to handle, has good workability, and can fix a nut at an arbitrary position.

[0005]

[Means for Solving the Problems]

 The present invention is composed of an inner member and an outer member. The inner member has a substantially tubular shape as a whole, is formed on the inner circumference, and is formed on the outer circumference with a female thread portion which is screwed into a bolt, and has a tapered tip. Taper male screw part, the hexagonal part formed on the outer periphery of the innermost part, and the hexagonal part that engages with the tool, the split groove that is formed partly on the periphery, extends in the axial direction, and penetrates the inner and outer circumferences. Has a concave groove formed on the side, extending in the axial direction, and facilitating the change in width of the split groove.The outer member is generally cylindrical in shape and is formed on the inner circumference. A loosening prevention nut characterized in that it has a taper female threaded portion that is screwed into and a hexagonal portion that is formed on the outer periphery and that engages with a tool is there.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail.

The loosening prevention nut 10 includes an inner member 11 and an outer member 12.

The inner member 11 has a substantially tubular shape as a whole, and has an internal thread portion 13 formed on the inner periphery thereof to be screwed into a bolt (not shown) to which the nut is to be attached. On the outer circumference, a tapered male screw portion 14 having a tapered tip is formed. A hexagonal portion 15 that engages with a tool such as a spanner is formed on the outer periphery of the rear end portion so as to rotate. A split groove 16 extending in the axial direction and penetrating the inner and outer circumferences is formed in a part of the periphery. On the opposite side of the split groove, a groove 17 is formed that extends over the entire circumference in the axial direction.

The outer member 12 has a substantially tubular shape as a whole, and a tapered female screw portion 18 that is screwed into the tapered male screw portion 14 is formed on the inner circumference. A hexagonal portion 19 that engages with a tool such as a spanner for rotating operation is formed on the outer periphery.

After the outer member 12 is fitted on the outer periphery of the inner member 11, a stop ring 20 is fitted on the tip of the inner member 11 and caulked to prevent the outer member 12 from coming off. There is.

Since the loosening prevention nut 10 has the above configuration, it is used and operates as follows.

First, the outer member 12 is moved to the stop ring 20 at the tip, and the female screw portion 13 is screwed into a bolt and stopped at a desired position. At this time, when the nut is strongly tightened, the hexagonal portion 15 of the inner member 11 is used.

Next, using the hexagonal portion 19, only the outer member 12 is rotated and moved to the inner portion of the inner member 11. As a result, the inner member 11 can be deformed by the split groove 16 and the concave groove 17, so that the inner member 11 is deformed by the tapered male screw portion 14 and the tapered female screw portion 18 so as to become thinner. Is tightened from the outer circumference to prevent loosening.

When removing the loosening prevention nut 10, contrary to the above, the outer member 12 may be rotated and moved to the tip of the inner member 11 to loosen the tightening, and the inner member 11 may be rotated.

As is clear from the above, the strength of the tightening force due to the rotation of the outer member 12 depends on the taper angle of the taper male screw portion 14 and the taper female screw portion 18, the depth, the width and the length of the concave groove 17. , It changes depending on the position, so it is recommended to set these appropriately according to the usage conditions.

As the retaining member for the outer member 12, the retaining ring 20 is used in the above-mentioned example, but various other structures such as one that deforms the tip of the inner member 11 can be used.

[0017]

[Effect of device]

 Since the loosening prevention nut of the present invention can be prevented from loosening by simply rotating the outer member as described above, it is easy to handle and has excellent workability. Moreover, the removal is also easy and convenient as well. Of course, there is no functional deterioration due to heat or chemicals. Further, it can be used not only when tightening the nut but also when fixing and fixing it at an arbitrary position, and can be widely applied.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

10 ... Loosening prevention nut, 11 ... Inner member, 12 ... Outer member,
13 ... Female screw part, 14 ... Tapered male screw part, 15 ... Hexagonal part, 16 ... Split groove, 17 ... Recessed groove, 18 ... Tapered female screw part, 19 ... Hexagonal part, 20 ... Stop ring.

Claims (1)

[Scope of utility model registration request] 1. An inner member and an outer member, wherein the inner member has a substantially tubular shape in its entirety, is formed on the inner circumference, and is formed on the outer circumference and a female thread portion to be screwed into a bolt, and the tip is thin. Shaped taper male thread part, formed on the outer periphery of the back end part, formed with a hexagonal part that engages with the tool, and a part on the periphery,
The split member that extends in the axial direction and penetrates the inner and outer peripheries, and the recessed groove that is formed on the opposite side of the split groove and that extends in the axial direction and that facilitates change in width of the split groove. It has a substantially cylindrical shape and has a tapered female thread portion formed on the inner periphery and screwed into the tapered male thread portion, and a hexagonal portion formed on the outer periphery and engaged with a tool. A loosening prevention nut characterized in that the material is fitted and prevented from coming off.