Drive system with full surface drive contact
AssigneeAcument Intellectual Properties, LLC
InventorDavid C. Goss
Life of this patent
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Abstract
A drive system with full surface drive contact. The drive system tends to maximize the surface contact pattern or area at typical bit-recess reaction (drive) torque values, thereby tending to minimize bit-recess surface contact stresses, coating damage, recess ream and premature bit fatigue failure. The drive system comprises a fastener and/or bit having drive surfaces formed of either polygon involutes or a single arc construction. A punch is also provided for forming a recess in either the fastener or the bit, wherein the punch has corresponding surfaces.
Claims20
A fastener comprising at least one of an external drive profile and a recess;
- drive surfaces at least of on said external drive profile and in said recess, each of said drive surfaces formed of at least one of polygon involutes and a single arc construction.
A fastener as recited in claim 3, wherein each lobe is formed of polygon involutes comprised of two arcs.
A bit or punch comprising a surface, said surface formed of at least one of polygon involutes and a single arc construction.
Dependencies are inferred from the claim text.