Patent ID: 6772930
Filing Date: 2004-08-10
Classification: B25C

Abstract:
A stapler for clinching at least two materials together with a generally U-shaped staple having two legs and a crown joining common ends of the two legs, the stapler comprising:a backing plate; an anvil disposed adjacent the backing plate, the anvil comprising spaced-apart wedges having respective chamfers adapted to contact the legs of the staple and guide the legs away from each other, a biasing element providing a biasing force to push the spaced-apart wedges of the anvil against the backing plate; a driver blade movable between the spaced apart wedges, the driver blade adapted to contact the crown of the staple; and an actuator connected to the driver blade and being operable to reciprocate the driver blade through advance and retract motions extending between the backing plate and the anvil, the advance motion advancing the driver blade between the spaced-apart wedges and pushing the crown of the staple over the spaced-apart wedges while curling the staple legs of the staple away from each other, and the retract motion retracting the driver blade from between the spaced-apart wedges substantially independent of the biasing force of the biasing element.