Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Stay bolt
Reexamination Certificate
2007-11-08
2011-12-27
Estremsky, Gary (Department: 3677)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Stay bolt
C411S426000, C411S386000
Reexamination Certificate
active
08083453
ABSTRACT:
A screw which can be manufactured at a low cost with a relatively simple constitution by performing precise machining suitable for tightening a screw without employing a tapping thread structure as a threaded portion shape and machining only the distal end of the threaded portion to have a shape projecting spherically, and which can ensure smooth and quick screw tightening work without causing such problems as heat generation or molding powder at all at screw tightening. The screw includes a head (12) provided with a bit fitting groove (13) at one end, and a threaded portion (14) which is machined precisely with substantially equal circular diameter over a full length, wherein the distal end (20) of the threaded portion (14) is shaped to have a spherical projection varying in a plurality of stages.
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DLA Piper (LLP) US
Estremsky Gary
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