Bar clamp with arrangement for displacing a clamping jaw a large distance to securely clamp a workpiece

A bar clamp comprising:

• a slide bar (20) comprising an arcuate toothed section (21) on a front end, a substantially triangular channel (22) proximate the toothed section (21), and a lengthwise elongated slot (23) behind the channel (22);
• a first clamping jaw carrier (40) slidably mounted on a front portion of the slide bar (20), a pivot hole (44), a triangular hole (43) aligned with the channel (22), a first clamping jaw (462) at one end, a first surface (45) at the other end, and a second surface (451) at the other end forming an acute angle relative to the first surface (45);
• a hollow operating handle (30) comprising a pivot hole (32) proximate one end, a first arcuate pressure surface (31) at one end being engaged with the first surface (45), a second arcuate pressure surface (311) continuous with the first arcuate pressure surface (31) and being engaged with the second surface (451), a spring-biased pivotal release level (34) at the other end, and an intermediate ratchet member (33) having the other end pivotably secured to one end of the release level (34) and one end being in tooth engagement with the toothed section (21);
• a pin (60) disposed across the channel (22), the triangular hole (43), and the pivot hole (32) for pivotably securing the operating handle (30), the slide bar (20), and the first clamping jaw carrier (40) together;
• a lock pin (70) disposed across the slot (23) and the pivot hole (44) for slidably securing the first clamping jaw carrier (40) to the slide bar (20);
• and
• a second clamping jaw carrier (50) displaceably mounted on a rear portion of the slide bar (20) and comprising a second clamping jaw (51) at one end opposite the first clamping jaw (462);
• whereby preliminarily clamping a workpiece between the first clamping jaw (462) and the second clamping jaw (51) by moving the second clamping jaw carrier (50) toward the first clamping jaw carrier (40), and counterclockwise pivoting the operating handle (30) will move the ratchet member (33) along the toothed section (21) to cause the first arcuate pressure surface (31) to exert a pressure on the first surface (45), cause the second arcuate pressure surface (311) to exert a pressure on the second surface (451) respectively, move down the triangular hole (43), move the first clamping jaw carrier (40) toward the second clamping jaw carrier (50) by sliding down the lock pin (70) relative to and along the slot (23) until the lock pin (70) is stopped by the bottom end of the slot (23), pivot the first clamping jaw carrier (40) counterclockwise about the lock pin (70), move the triangular hole (43) transversely relative to the pin (60), and displace the first clamping jaw (462) a predetermined distance so as to securely clamp the workpiece.