ANTI-VIBRATION ANTI-LOOSENING THREADED FASTENER

Abstract

An anti-vibration anti-loosening threaded fastener is revealed. The threaded fastener includes a bolt and a nut. The bolt consists of a head, a stud disposed on a bottom surface of the head, and a through hole mounted axially in the stud. The nut is composed of a threaded slotted portion provided with an opening facing upward and fastened to the stud by threaded connection, and a post protruding from central area of a bottom of the threaded slotted portion. The post and the through hole are disposed eccentrically to each other so that forces that pull the bolt and the nut together are generated when the bolt and the nut are threaded and fastened with each other and the post is mounted into the through hole. Thereby the bolt and the nut are fastened more tightly and the threaded fastener is vibration resistant and anti-loosening.

Claims

1. An anti-vibration anti-loosening threaded fastener comprising: a bolt having a head, a stud disposed on a bottom surface of the head, and a through hole mounted axially in the stud; and a nut which includes a threaded slotted portion provided with an opening facing upward and fastened and threaded to the stud; and a post protruding from central area of a bottom of the threaded slotted portion; wherein either the through hole or the post is arranged eccentrically so that the through hole and the post are eccentric to each other; the post and the through hole are mated eccentrically and connected tightly when the bolt and the nut are threaded and fastened with each other.

2. The threaded fastener as claimed in claim 1, wherein the through hole is a round hole while the post is a cylinder which is matched with the through hole.

3. The threaded fastener as claimed in claim 2, wherein the through hole is penetrating the head.

4. The threaded fastener as claimed in claim 3, wherein a sensor is further mounted in the through hole; the post contacts and presses the sensor while the bolt is threaded and fastened with the nut securely.

5. The threaded fastener as claimed in claim 2, wherein a sensor is further mounted in the through hole; the post contacts and presses the sensor while the bolt is threaded and fastened with the nut securely.

6. The threaded fastener as claimed in claim 1, wherein the through hole is penetrating the head.

7. The threaded fastener as claimed in claim 5, wherein a sensor is further mounted in the through hole; the post contacts and presses the sensor while the bolt is threaded and fastened with the nut securely.

8. The threaded fastener as claimed in claim 1, wherein a sensor is further mounted in the through hole; the post contacts and presses the sensor while the bolt is threaded and fastened with the nut securely.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:

[0016] FIG. 1 is an explosive view of an embodiment of an anti-vibration anti-loosening threaded fastener according to the present invention;

[0017] FIG. 2 is a sectional view of an embodiment in which an assembly of a bolt and a nut being threaded and under tightened according to the present invention;

[0018] FIG. 3 is a sectional view of an embodiment in which an assembly of a bolt and a nut already tightened according to the present invention;

[0019] FIG. 4 is a sectional view of an embodiment in which a sensor is mounted therein and an assembly of a bolt and a nut being threaded and under tightened according to the present invention;

[0020] FIG. 5 is a sectional view of an embodiment in which a sensor is mounted therein and an assembly of a bolt and a nut already tightened according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0021] In order to learn technical content and functions of the present invention more completely and clearly, please refer to the following embodiments with detailed descriptions together with the related figures and numbers therein.

[0022] Refer to FIG. 1 and FIG. 2, an anti-vibration anti-loosening threaded fastener according to the present invention includes a bolt 1 and a nut 2.

[0023] The bolt 1 consists of a head 11, a stud 12 extending downward from a bottom surface of the head 11 and provided with threads on a surface thereof, and a through hole 13 mounted axially in the stud 12 and penetrating the head 11.

[0024] The nut 2 which looks like a hat has a threaded slotted portion 21 with an opening facing upward and threads arranged at the periphery thereof, and a post 22 protruding from central area of a bottom of the threaded slotted portion 21. The threaded slotted portion 21 and the stud 12 are fastened to each other by threaded connection. The post 22 and the through hole 13 are mated when the bolt 1 and the nut 2 are threaded and fastened with each other. It should be noted that either the post 22 or the through hole 13 is eccentrically disposed so that the post 22 and the through hole 13 are eccentric to each other. In this embodiment, the post 22 is arranged eccentrically.

[0025] In this embodiment, the through hole 13 on the stud 12 of the bolt 1 is a round hole while the post 22 in the threaded slotted portion 21 of the nut 2 is a cylinder.

[0026] By the eccentric relationship of the through hole 13 mounted axially in the stud 12 of the bolt 1 with respect to the post 22 protruding from the central area of the bottom of the threaded slotted portion 21 of the nut 2, not only the post 22 can be inserted into and mated with the through hole 13, forces in vertical and horizontal directions with varying degrees are generated and acting on the post 22 and the through hole 13 to suppress displacement between the nut 2 and the bolt 1 caused by vibrations when the nut 2 and the bolt 1 are threaded and fastened with each other. Thereby while the equipment or the machine works and further generate vibrations, the displacement caused by vibrations between the bolt 1 and the nut 2 are suppressed by eccentrically mating and limiting relationship between the through hole 13 and the post 22. Thereby the purposes of vibration resistance and loosening resistance are achieved.

[0027] A sensor 3 is further mounted in the through hole 13 of the bolt 1. While the bolt 1 is threaded and fastened with the nut 2 securely, the post 22 of the nut 2 contacts and presses the sensor 3 for checking the fastening state between the bolt 1 and the nut 2. When the post 22 of the nut 2 is not in contact with and pressing the sensor 3, the loosening occurs between the bolt 1 and the nut 2. At the moment, the sensor 3 sends a message to inform relevant people about the condition so that they can perform on-site check and maintenance service and avoid danger to life and property caused by loosening bolts and nuts.

[0028] Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalent.