Patent ID: 7434498

Claim:
A tool comprising toggle-locking tool parts including a fixed handle having an outer end comprising a threaded bore adapted to receive an adjustment screw and also having a channel for slidably receiving a bearing end of a lever arm, an upper jaw member integral with the opposite end of said fixed handle, a lower jaw member, a movable handle, and a lever arm having a bearing end, said parts being conventionally arranged with appropriate toggle linkages to form a toggle-locking tool, the improvement consisting of an adjustment screw assembly comprising an adjustment screw, adapted to be fed into and to engage said threaded bore in the outer end of said fixed handle, said adjustment screw itself comprising an internal bore extending through its length and including a fine-threaded portion, and a force-enhancing shank comprising a head portion, a fine-threaded intermediary portion, and an end portion, said shank being adapted to be fed into and threaded within the internal bore of said adjustment screw to a position wherein said end portion of said shank extends beyond said adjustment screw.