Device to perforate, stamp, emboss, flange or join sheet metal parts, especially to construct chassis, has jaw part with pivoting push arm and counter bearing with pivot drive for push arm

摘要

The device (1) has a jaw part (2) with a pivoting push arm (4) and a counter bearing with a pivot drive for the push arm that has a piston and cylinder unit (7). The piston rod (8) is fitted with a first toggle joint (9). A second toggle joint (11) is offset from the push arm bearing (3), sot that when the piston rod is displaced, the push arm is pivoted.. When the piston rod moves along a given path, the first toggle joint is moved by a bearing unit to the side of the second toggle joint, so that an elbow lever angle is not varied at a given elbow lever position at least at the end pivot area of the push arm and the jaw closing force remains the same over a given working path