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US 2010/0143072 A1Published application
Fastener and Driving Tool
OwnerCheong Kong Changinventor
Life of this patent
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OwnerCheong Kong Changinventor
Estimating the term…
An improved fastener (10) comprises of a threaded shank (11), and a head (12) having a tool engaging recess (13) formed by a plurality of grooves (16) comprising an inner portion located approximately within circumference of shank (11), formed by inclined side walls (28, 31, 32) of part elliptical configurations disposed convexly and symmetrically to central axis and bisector lines; an outer portion formed with pairs of inclined flat drive walls (16a) extending to concentric peripheral arcs (16b) near circumference of head (12) to maximize torque transfer and sharp drive corners (30); sharp interlocking corners (17) separate inner portion from outer portion of the grooves enabling an interlocking action during the turning of the fastener and thus preventing the bit from slipping out even during high resistance to penetration of the fastener; and base walls (19) with an inner portion (22) and an outer portion (21); wherein the grooves extend in radial direction from a central axis (15) and symmetrically spaced at bisector lines (18) of grooves (16) on top of head (12). The driving tool includes a shank and a drive head with respective drive bits that engage in and substantially conform to the shape of the recess of the fastener for a snug fit for efficient torque transfer.
1-20. (canceled)
A fastener (10) with a threaded shank (11) connected to a head (12) having a tool engaging recess (13) formed by a plurality of grooves (16), said grooves (16) comprising:
A driving tool (14) with shank (23) and drive head (24) having drive bits (25) for turning said fastener (10) as claimed in claim 1, wherein said drive bits (25) comprise:
Dependencies are inferred from the claim text.