Back square has a clamp with a connecting link between them to position the ruler leg of the clamp to give drilling positions without marking the workpiece surface

摘要

The back square (10) has a clamp (20), with a link (18) between them. The back square (10) has one leg (14) and a leg with a ruler (16) at 90 deg to each other. The connecting link (18) has a release mounting as a pin joint with a pin (22) and pin holder (24). The pin (22) is at one clamping pad (28) and the opening for the pin (30) is at the back square (10). The clamp (20) is of plastics, metal, or a combination of metal and plastics, as a modified glue vise.