Patent ID: 8763874
Filing Date: 2014-07-01
Classification: B25C

Abstract:
1. A driving mechanism for use in a fastener driving tool, said driving mechanism comprising: (a) a guide body that has a receiving end, an exit end, and a passageway therebetween, said guide body being configured to receive a fastener that is to be driven from said exit end; (b) a movable driver actuation device; (c) an elongated driver member that is in mechanical communication with said movable driver actuation device at a first end of said driver member, said driver member having a second, opposite end that is sized and shaped to push a fastener from said exit end of the guide body, said driver member having a direction of movement between a driven position and a ready position, said driver member having a longitudinal edge, said driver member having a plurality of spaced-apart protrusions along said longitudinal edge; and (d) a lifter member that exhibits a contoured contact surface that, at predetermined locations along said contoured contact surface, makes contact with said plurality of spaced-apart protrusions of said driver member such that, as said lifter member is moved in a first direction, said lifter member causes said driver member to be moved from its driven position toward its ready position, said contoured contact surface comprising a plurality of spaced-apart extensions, a final one of said spaced-apart plurality of extensions having a shape comprising: an arcuate shape for a first portion of its outer perimeter, and at least two outer corners with a substantially linear face therebetween for a second portion of said outer perimeter; wherein said shape for said final one of the plurality of extensions reduces side-loading forces between said lifter member and said elongated driver member.