JP2011127752A - Lock washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable lock washer securely locking. <P>SOLUTION: An outer circumferential part 1A has a flat part, and a center circumferential part 1X has a hole for inserting a male screw. An intermediate circumferential part sandwiched between the center circumferential part and the outer circumferential part is divided into two or more by a notch 1Y and a locking piece notch. A fan-like divided part 1B is formed to be a shape of a cone. Further, an end of the cone part in the opposite direction of the nut fastening direction is folded to provide a lock washer locking piece. When the lock washer is used, it fastens a hexagonal nut, and the divided part 1B formed in a cone shape generates elastic repulsion. When the washer fastens the hexagonal nut, it fastens while straddling the lock washer locking piece. When intense vibration and impact are applied, and when the hexagonal nut is loosened to move in the rotational direction, frictional force caused by the elastic repulsion of a disc spring shaped cone and a lock washer locking corner part biting the hexagonal nut prevent loosening rotation to maintain strength of a structure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a nut locking prevention.

In the present invention, the nut is prevented from being loosened by a dynamic load, a repeated load, a thin wood or the like.

Patent Publication 2003-307209

Conventionally, there has been a spring washer or the like, but it may be loosened by a dynamic load, a repeated load, or the like, but the present invention has been made to solve this problem.

In order to prevent the nut from loosening due to dynamic load, repeated load, etc., conventionally, there was a spring washer that improved the locking by using the elastic repulsive force of steel etc. However, in the present invention, the washer is provided with a locking piece having a wedge effect in addition to the disc spring elastic body having a large elastic repulsion force.

As described above, the present invention dramatically prevents loosening due to the locking effect of the lock washer and the wedge effect of the lock washer locking piece to the bolts and nuts tightening equipment even under long periods of intense vibration and impact. It is an improvement.

The lock washer of this invention is shown, (A) is a top view, (B) is AA center sectional drawing, (C) is BB sectional drawing which showed the lock washer wedge part. The main part to which this invention was applied is shown, (A) is before tightening, (B) is almost tightened. The right half is a partial longitudinal sectional view as seen from the front and the left half as seen from the side. (A) is a top view, (B) is a center sectional view, and (C) is a sectional view showing a lock washer wedge.

Hereinafter, the configuration of the present invention will be described in detail based on specific embodiments shown in the accompanying drawings.

FIG. 1 shows a lock washer constructed in accordance with the present invention. The lock washer 1 has a flat outer circumferential portion 1A. A central hole 1X into which a male screw is inserted is provided at the center, and a notch 1Y that divides the middle circumferential part 1B sandwiched between the outer side of the central hole and the inner side of the outer circumferential part into four equal parts is provided. Also, four locking notches 1Z corresponding to the lock washer locking pieces are provided inside the outer circumferential portion of the notch 1Y.
Next, the portion of the middle circumferential portion 1B that is divided into four is formed into a conical spring conical shape, and the leading end portion 1W in the nut tightening direction of the middle circumferential portion 1B is bent at an engagement bending angle α of 90 degrees or more. This bent portion becomes the lock washer locking piece 1C. The conical part and the locking piece are equally arranged at four places around the center part. In addition, the lock washer is heat-treated to maintain elasticity and hardness.
In FIG. 2A, 2 is a hexagonal nut, 3 is a male screw, 4 is a wood or metal material, and shows a state before tightening a lock washer. (B) is a state where the lock washer is almost tightened.
When you start tightening the hexagonal nut, the conical part and the locking piece of the lock washer are pressed and tightened, so an elastic repulsion force always acts between the wood and the hexagonal nut to prevent loosening.
Further, when the hexagon nut is tightened, the lock washer engaging piece C is tightened while being tilted, but when the hexagon nut is loosened and rotated, the lock washer engaging corner portion 1D bites against the hexagon nut and prevents the rotation. As a result, the hexagon nut is not loosened. In addition, even if wood rust due to shrinkage specific to wood occurs, the conical elastic repulsion force of the lock washer eliminates loosening of the fastening portion of the structure and maintains structural strength, leading to an improvement in seismic strength.

DESCRIPTION OF SYMBOLS 1 Lock washer 2 Hexagon nut 3 Male screw 4 Wood or metal member 1A Outer circumference part 1B Middle circumference part 1C Lock washer latching piece 1D Lock washer latching corner part 1W Nut fastening direction most advanced part 1X Center hole 1Y Notch 1Z Locking notch α Locking bending angle

Claims (3)

The outer circumference is flat and the center has a center hole into which a male screw can be inserted.
The middle circumferential part sandwiched between the center hole and the outer circumferential part is divided into two or more parts and formed.
The division is connected to the center hole, and is divided into two or more halves by notching from the center hole to the inside of the outer circumferential flat portion on the radiation.
A lock washer having a nut locking stopper that is formed by cutting one side of each notch surface, providing a nut locking stopper, and forming a segmented fan-like portion on a conical surface of a disc spring shape. The outer circumferential portion is not flat, and part or all of the outer circumferential portion is formed integrally with the middle circumferential portion dividing fan-like portion by providing a conical surface having a disc spring shape with a nut locking stopper. Such lock washer. The lock washer according to claim 1, wherein a corner portion of the nut loosening locking engagement piece contacting the nut surface is an acute angle portion.

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