Browse Prior Art Database

Publication Date: 2016-Aug-02
Document File: 8 page(s) / 170K

Publishing Venue

The Prior Art Database


A friction device located on a threaded connection that prevents a connection from completely loosening, even after loss of preload in the thread, is disclosed. This friction device may include an o-ring or an interfering pin. The first device works by crushing an o-ring (e.g. a metal o-ring) between two surfaces, a threaded member and prep, creating reaction forces at the outer diameter and the inner diameter of the o-ring. These reaction forces create a prevailing torque in the system that prevents the threaded member from easily unthreading if preload is lost. The second device works similar to the first, except the reaction force is created by crushing a pin (e.g. a soft pin) rather than an o-ring.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 30% of the total text.

Page 01 of 8



[0001]This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the presently described embodiments. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the described embodiments. Accordingly, it should be understood that these statements are to be read in this light and not as admissions of prior art.

[0002]This disclosure relates to a thread locking/prevailing torque fastener assembly and especially to a friction device for thread retention for a fastener thread form where retention and prevailing torque is desired, even after connection preload is lost. The friction device of the present disclosure includes improvements over traditional methods such as nylon buttons, which may be impossible or impractical for use with low wall thickness threaded members, or nylon thread locking inserts, which can also be problematic due to their material instability with varying temperature and their propensity to leave nylon debris in the thread form.

Brief Description of the Drawings

[0003]For a detailed description of embodiments of the present disclosure, reference will now be made to the accompanying drawings in which:

[0004]FIG. 1 depicts cross-sectional views of a friction device in accordance with one or more embodiments of the present disclosure;

[0005]FIG. 2 depicts a cross-sectional view of aspects of a friction device in accordance with one or more embodiments of the present disclosure; and

[0006]FIG. 3 depicts a cross-sectional view of aspects of a friction device in accordance with one or more embodiments of the present disclosure.


Page 02 of 8

Detailed Description

[0007] One or more specific embodiments of the present disclosure will be

described below. In an effort to provide a concise description of these

embodiments, all features of an actual implementation may not be described in the

specification. It should be appreciated that in the development of any such actual

implementation, as in any engineering or design project, numerous

implementation-specific decisions must be made to achieve the developers'

specific goals, such as compliance with system-related and business-related

constraints, which may vary from one implementation to another. Moreover, it

should be appreciated that such a development effort might be complex and time- consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

[0008]The drawing figures are not necessarily to scale. Certain features of the embodiments may be shown exaggerated in scale or in somewhat schematic form, and some details of conventional elements may not be shown in the interest of clarity and conciseness. Although one or more of these embodiments may be preferred,...