Patent ID: 8721245

Claim:
A penetration load reduced staple for use with a stapler configured to bind a plurality of sheets of paper, the penetration load reduced staple comprising: a pair of leg portions configured to penetrate the sheets of paper; a distal end portion formed at a distal end of each leg portion, each distal end portion comprising a tapered portion of the respective leg portion forming an apex; and a crown portion connecting the pair of leg portions, wherein each of the leg portions comprises a first protrusion protruding in a first direction intersecting with a longitudinal direction of the leg portion and a second protrusion protruding in a second direction intersecting with the longitudinal direction of the leg portion, the first protrusion protruding from a portion of an inner side surface of the leg portion between the crown portion and the distal end portion of the leg portion and near the distal end portion such that the inner side surface extends along the longitudinal direction of the leg portion between the tapered portion and the first protrusion and between the first protrusion and the crown portion, the second protrusion protruding from a portion of an outer side surface of the leg portion between the crown portion and the distal end portion and near the distal end portion such that the outer side surface extends along the longitudinal direction of the leg portion between the tapered portion and the second protrusion and between the second protrusion and the crown portion, wherein a protruding height of the first protrusion from the inner side surface and a protruding height of the second protrusion from the outer side surface are 0.01 mm to 0.03 mm.