Multi-tier security fastener
AssigneeMcGard, Inc.
InventorThomas R. Lanham
Life of this patent
Estimating the term…
Abstract
A multi-tier security fastener in the nature of a nut or bolt having a body with a first tier having a lobed drive surface, and second and third cylindrical tiers on opposite sides of the first tier, with all three tiers having different effective diameters. The second and third cylindrical tiers can have irregularities in the nature of a lobe or a depression.
Claims17
A multi-tier security fastener comprising a body having a longitudinal axis, a first tier on said body, a drive pattern on said first tier, said drive pattern being located on a first surface extending in an axial direction relative to said longitudinal axis, second and third key-receiving tiers on said body axially spaced from said first tier, second and third key-receiving surfaces on said second and third key-receiving tiers, respectively, extending in axial directions relative to said longitudinal axis, said first and second and third tiers having an index of between about 0.625 and 1.0 which is the sum of the ratios of the axial length to diameter of each tier.
Dependencies are inferred from the claim text.