Method and apparatus for forming the head of a high torque faste

Details Method and apparatus for forming the head of a high torque faste Method and apparatus for forming the head of a high torque faste

1984-10-17

1986-05-20

Combs, E. Michael

10 10R, B23G 900, B21K 148

Patent

active

045891540

ABSTRACT:
An improved high torque fastener is provided of the type having a screw head with a generally bow-tie shaped driving slot formed with undercut side walls and an arcuately concave bottom wall for reception of an arcuately convex blade of a driving tool for relatively high torque transfer therebetween. The improved fastener includes a conical recess positioned centrally along the driving slot with a base diameter substantially greater than the width of the slot thereat and an apex disposed substantially below the slot bottom wall. The improved driving tool includes a conical tip formed centrally on an arcuately convex blade with a substantially pointed end projecting beyond the blade, wherein the blade and tip provide geometric surfaces for facilitated and aligned centering and coaxial substantial mating reception into the fastener driving slot and conical recess. Apparatus for forming the improved fastener is also disclosed.

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