Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1979-05-14
1981-03-31
Zugel, Francis K.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
411 6, F16B 3102
Patent
active
042586062
ABSTRACT:
A screw adapted to be driven by an ordinary straight-bladed screwdriver, the head of the screw having a cylindrical socket formed in the top surface of the head thereof coaxially with the screw shank adapted to receive the driver blade therein, the wall of the socket preventing lateral slippage of the driver blade from the socket and permitting turning of the blade, portions of the wall being offset resiliently inwardly to inhibit turning of the blade, and so configurated that a partial turn of the blade causes it to be gripped between portions of the offset wall to hold the screw releasably on the blade, so that the screw may be inserted in positions of difficult access, to resist rotation of the blade, more strongly after a further partial turn of the blade, whereby the screw may be driven by the blade with a suitable torque, and to yield completely on the application of a still greater torque, whereby to limit the maximum torque applicable to the screw by the screw driver.
REFERENCES:
patent: 1395592 (1921-11-01), Odom
patent: 1487610 (1924-03-01), Schatzel
patent: 2755699 (1956-07-01), Forster
patent: 3289524 (1966-12-01), Rubin
patent: 3456548 (1969-07-01), Schmidt et al.
patent: 3504591 (1970-04-01), Christophersen
patent: 3709087 (1973-01-01), Stone
patent: 3854372 (1974-12-01), Gutshall
patent: 4176786 (1979-12-01), Braukmann
Hamilton John A.
Zugel Francis K.
LandOfFree
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 Screw, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Screw will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2237455