Title:
LIGHTWEIGHT THREADED FASTENER AND THREAD ROLLING DIE
Document Type and Number:
WIPO Patent Application WO2000026546
Kind Code:
B1
Abstract:
The present invention is a lightweight threaded bolt type fastener (12) having a shank (21) with a large diameter portion (22) and small diameter portion (28) connected by a transition portion (26); a thread (29) is roll formed on the small diameter portion (22) and terminates in a run-out section (34) where the thread gradually decreases in root depth and width and with the run-out section being of minimal axial length and being located closely adjacent the transition portion (26) to produce a run-out zone of minimal axial length. A rolling die (46, 46') for forming the thread (29) with minimal thread run-out having ridge segments (57) with tapered end surfaces (64) for providing the run-out thread with an end wall (35) parallel to the transition (26) portion and a method of making the bolt type fastener.
Inventors:
MARCH MICHAEL U
Application Number:
PCT/US1999/023337
Publication Date:
September 08, 2000
Filing Date:
October 05, 1999
Export Citation:
Assignee:
HUCK INT INC (US)
International Classes:
B21H3/06; F16B33/02; F16B35/00; F16B35/04; (IPC1-7): F16B35/00; F16B35/04
Download PDF: