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
1994-09-27
1996-11-05
Meyers, Steven N.
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
411308, 411411, F16B 2500
Patent
active
055709834
ABSTRACT:
A reduced-friction screw is described. The screw requires less turning torque than a conventional screw to drive it into a workpiece. The shaft of the screw has a reduced-thickness thread that produces less sliding friction than a conventional screw having thread of the same depth and pitch. In addition, the holding ability of the reduced-friction screw is substantially the same as a conventional screw having thread of the same pitch and depth. Another embodiment contains a shaft having a reduced diameter, to further reduce sliding friction. Yet another embodiment contains a segmented, reduced-thickness thread that resists removal and loosening when the workpiece is subject to twisting, vibration, or warping. To prevent loosening of the reduced-friction screw, the bottom of the screw head may contain protrusions to increase the frictional contact of the head with the workpiece.
REFERENCES:
patent: 42475 (1864-04-01), Harvey
patent: 493585 (1893-03-01), Herzberg et al.
patent: 867552 (1907-10-01), Bradford
patent: 1933332 (1933-10-01), May
patent: 2128757 (1938-08-01), Olson
patent: 2352540 (1944-06-01), Hanneman
patent: 2473752 (1949-06-01), Johnson
patent: 2587544 (1952-02-01), Sneddon
patent: 2668072 (1954-02-01), Falk
patent: 3351115 (1967-11-01), Boehlow
patent: 3469491 (1969-09-01), Munsey
patent: 3878759 (1975-04-01), Carlson
patent: 4189975 (1980-02-01), Nisida
patent: 4334814 (1982-06-01), McKewan
patent: 4516893 (1985-05-01), Barth
patent: 4572720 (1986-02-01), Rockenfeller et al.
patent: 4705441 (1987-11-01), Arnold
patent: 4764066 (1988-08-01), Terrell
patent: 4820235 (1989-04-01), Weber et al.
patent: 5188496 (1993-02-01), Giannuzzi
patent: 5199839 (1993-04-01), DeHaitre
patent: 5203657 (1993-04-01), Nagoshi et al.
patent: 5226766 (1993-07-01), Lasner
patent: 5249882 (1993-10-01), Nagoshi et al.
patent: 5294227 (1994-03-01), Forster et al.
Estremsky Gary
Meyers Steven N.
LandOfFree
Reduced-friction 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 Reduced-friction screw, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduced-friction screw will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2009841