Patent ID: 11926021
Assignee: TTAPDRIVE AS
Field: Machine tools (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 21:
22. A drive system comprising:
a drive bit comprising a drive portion and a pilot end which extends from the drive portion and ends at a pilot end surface, the drive bit comprising
a pilot end longitudinal axis, and
an outer leading wall that is tapered with respect to the pilot end longitudinal axis to define a leading wall angle; and

a fastener having
an internal pilot recess that receives the drive bit, the internal pilot recess having a recess longitudinal axis, and
an inner pilot recess wall that is tapered with respect to the recess longitudinal axis to define a recess wall angle, wherein the leading wall angle of the drive bit is greater than the recess wall angle of the inner pilot recess wall,

wherein the outer leading wall of the pilot end contacts the inner pilot recess wall along a circumferential line of contact at a targeted focal area at a bottom of the outer leading wall, proximate the pilot end surface, to achieve a desired level of frictional engagement between the pilot end and the fastener, wherein the outer leading wall has a circular cross section at the targeted focal area to provide the desired level of frictional engagement between the pilot end and the fastener.