US Patent 8109003 Pruning shears

Pruning shears include a first arm including a first handle and a jaw including a first tab; a first blade including a cutting edge and an ear opposite the cutting edge and having a first through hole wherein the first arm and the first blade are secured together by inserting the first tab into the first through hole; a second arm including a second handle and a joining section; a second blade secured to the joining section; a pivot joint for pivotably securing the first arm to the second arm; and a torsion spring positioned between the first arm and the second arm. The torsion spring exerts an expansion force to push the first arm and the second arm apart from each other.