Accession Number : ADD013915

Title :   Graduated-Load Spring Washer System for Screws and Threaded Fasteners.

Descriptive Note : Patent Application, Filed 17 Aug 88,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Rose, James D

Report Date : 17 Aug 1988

Pagination or Media Count : 21

Abstract : The present invention relates to spring washers and particularly to a graduated-load spring washer having a tailored configuration in screw or threaded fastener systems that will maintain large preloading and screw-locking force before, during and after joint thickness change due to material stress relaxation, creep or wear. The graduated-load spring washer system of the present invention can be tailored to provide a precise clamping force due to its similarity to a single turn coil spring. The present device has the capability to provide for small loads as a single turn coil spring or large loads due to its deflection similar to a Belleville washer. Patent application. (jes)

Descriptors :   *FASTENINGS, *PATENT APPLICATIONS, *SCREWS, CLAMPS, COILS, CREEP, DEFLECTION, MATERIALS, PRECISION, SCREW THREADS, SPRINGS, STRESS RELAXATION, THICKNESS, WASHERS(SPACERS)

Subject Categories : Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE