Fastening member having threads, particularly a screw and screwing tool
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 15, 1994
Grant Date -
N/A
app pub date -
Sep 30, 1993
filing date -
Jan 4, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A threaded fastening member includes an actuating end having a head. The head has a diameter projecting beyond a diameter of the thread of the fastening member and is coaxial with a thread axis. A centrally located recess is provided within the head for the application of interior forces. The recess includes radial outwardly projecting slots, each having two flanks lying in respective planes. Each flank plane is essentially tangential to an imaginary cone that is co-axial with the thread axis. The recess further includes a pair of segmented circumferential faces separating each slot from an adjacent slot, and a transitional linear inner edge formed between each pair of segmented circumferential faces and each flank of a respective slot. Each inner edge converges towards a common point on the thread axis at a position within the fastening member, and each face of each pair is inclined relative to the other face of the pair at an angle, whereby the inner edges define the radially innermost limits of the recess and are for the reception of the interior forces.
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