Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation
Patent
1992-12-30
1993-08-10
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Pilot end having means enhancing fastening or installation
411387, 411426, F16B 2500
Patent
active
052343014
ABSTRACT:
Hole forming and selftapping screw of up to approximately 6 mm thread diameter for tapping into sheet metal of a thickness of up to approximately 1 mm comprising a head including a formation for receiving a tool, a thread shank and a cylinder member following thereon having a diameter less than the thread-pitch diameter of the thread shank, merging into a tapered hole forming member. The thread shank merges with the cylinder member via a taper extending over approximately four threads, a distance corresponding approximately to the four-fold sheet metal thickness. The hole forming member terminates in a convexly curved friction surface corresponding to a radius (R) of approximately 0,5 mm. The entire screw is formed in one piece of tempered steel having a tensile strength of up to approximately 1400 N/mm.sup.2, mechanically hardened steel respectively.
REFERENCES:
patent: 2479730 (1949-08-01), Dewar
patent: 3094894 (1963-06-01), Broberg
patent: 3156152 (1964-11-01), Reed
patent: 3438299 (1969-04-01), Gutshall
patent: 3500712 (1970-03-01), Wagner
patent: 3578762 (1971-05-01), Siebol
patent: 3924508 (1975-12-01), DeCaro
patent: 4064784 (1977-12-01), Adler
patent: 4068554 (1978-01-01), Hirabayashi
patent: 4114507 (1978-09-01), Fischer et al.
patent: 4179976 (1979-12-01), Sygnator
patent: 4369609 (1983-01-01), Sheldon et al.
patent: 4701088 (1987-10-01), Crull
patent: 4749322 (1988-06-01), Sygnator
Bostitch ASN-1, Pneumatic Screw-Nailer for Lightweight Steel Framing, 2 pp. 1988 Stanley-Bostich, Inc. East Greenwich RI 02818.
Grossberndt Hermann
Klees Horst
Kretschmer Gunter
EJOT Eberhard Jaeger GmbH & Co.
Lindsey Rodney M.
LandOfFree
Hole forming and selftapping screw does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hole forming and selftapping screw, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hole forming and selftapping screw will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1721227