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
1996-05-13
1998-08-18
Wilson, Neill R.
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
411412, 408229, F16B 2500, B23B 5100
Patent
active
057951209
ABSTRACT:
A screw or tap for forming or cutting threads in a workpiece. The screw includes a cylindrical shank directed along a longitudinal axis. The shank includes a work holding portion having a plurality of helical threads of a constant crest diameter, a constant root diameter, a constant pitch diameter, and circular cross-section. The shank also has a lead portion having at least a portion of a helical thread. Intermediate the work holding portion and the lead portion is a forming portion. The forming portion has at least one full thread located thereon having a crest diameter which is greater than the crest diameter of the plurality of helical threads on the holding portion, a root diameter which is larger than the root diameter of the plurality of helical threads on the holding portion, and a pitch diameter which is proportionally greater than the pitch diameter of the holding portion. A coupler is located at the second end of the cylindrical shank for accepting or coupling with a driving tool such as a screwdriver. The screw may be designed to form threads, in which case the one full thread on the forming portion is lobular-shaped and has a lobular profile which is greater that the constant profile of the threads on the holding portion. When designed to cut threads, the screw has at least one groove formed in the shank which has a cutting edge and extends through the forming thread on the forming portion.
REFERENCES:
patent: 3351115 (1967-11-01), Boehlow
patent: 3426642 (1969-02-01), Phipard, Jr.
patent: 3527136 (1970-09-01), Wilson
patent: 3831415 (1974-08-01), Skierski
patent: 3935785 (1976-02-01), Lethom
patent: 3939512 (1976-02-01), Thurston et al.
patent: 3978760 (1976-09-01), Muenchinger
patent: 4040328 (1977-08-01), Muenchinger
patent: 4259889 (1981-04-01), Capuano
patent: 4844676 (1989-07-01), Adamek
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