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Modified locking thread form for fastenerA threaded fastener has a standard part with a standard thread form characterized by thread walls with a standard included angle, and a modified part complementary to the standard part having a modified thread form characterized by thread walls which are symmetrically inclined with a modified included angle that is different from the standard included angle of the standard part's thread walls, such that the threads of one part make pre-loaded edge contact with the thread walls of the other part. The thread form of the modified part can have an included angle that is greater, less, or compound as compared to the included angle of the standard part. The standard part may be a bolt and the modified part a nut, or vice versa. The modified thread form holds securely even under large vibrational forces, it permits bi-directional use of standard mating threads, is impervious to the build up of tolerances and can be manufactured with a wider range of tolerances without loss of functionality, and distributes loading stresses (per thread) in a manner that decreases the possibility of single thread failure.
Document ID
20080004591
Acquisition Source
Goddard Space Flight Center
Document Type
Other - Patent
Authors
Roopnarine,
Vranish, John D.
Date Acquired
August 24, 2013
Publication Date
April 14, 1998
Subject Category
Mechanical Engineering
Funding Number(s)
CONTRACT_GRANT: NAS5-32
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-5,738,472
Patent Application
US-PATENT-APPL-SN-733345

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