Recessed head fastener and driver systems

Details Recessed head fastener and driver systems Recessed head fastener and driver systems

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 23/00 (2006.01) B25B 15/00 (2006.01)

Patent

CA 2305435

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.

L'invention porte sur des chevilles (10) à tête creuse d'une configuration telle que la force appliquée par les lames d'un tournevis (12) sur leurs ailettes (16) le soient sur les zones périphériques desdites ailettes. Les ailettes (16) de l'évidement de la cheville peuvent comporter des plaquettes (36) de transmission de couple dans leurs zones périphériques entrant en contact avec des lames du tournevis. Lesdites plaquettes peuvent être délimitées par des zones dégagées des parois d'entraînement des ailettes (16) creuses, ces zones dégagées étant prévues pour éviter le contact avec les lames du tournevis. Des nervures de stabilisation peuvent également être prévues dans les zones centrales des parois d'entraînement. Le tournevis peut pour sa part comporter plusieurs nervures radiales renforçant le contact des nervures avec les zones les plus périphériques des parois d'entraînement des ailettes. Le tournevis et l'évidement sont compatibles entre eux, mais aussi avec d'autres têtes creuses et tournevis usuels n'incorporant pas l'invention. L'invention porte également sur des poinçons et des procédés de fabrication des susdites chevilles.

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