Recessed head fastener and driver systems

B - Operations – Transporting – 26 – F

Patent

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Details

B26F 1/00 (2006.01) B25B 15/00 (2006.01) B26F 1/32 (2006.01) F16B 23/00 (2006.01)

Patent

CA 2589776

Recessed head fasteners (10) are provided with a configuration by which the force applied by the blades of the driver (12) to the recessed wings is applied at the radially outer regions of the wings (16). The wings (16) of the fastener recess may be provided with torque pads at the outer regions of the wings adapted to engage the outer portions of the driver blades. The torque pads (36) may be defined by relieved regions on the drive walls of the recess wings (16). The relieved regions are formed to avoid contact with the driver blades. Stabilizing ribs also may be defined at the radially inward regions of the drive walls. A recess engageable driver may include a plurality of radially extending ribs configured to promote engagement of the ribs with the most radially outward regions of the recess drive walls. The driver and the recess are compatible with each other as well as with otherwise corresponding conventional recesses and drivers that do not incorporate the invention. Also disclosed are punches and methods for making the disclosed fasteners.

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