| 摘要 |
The device consists of a piece of angle iron (1) welded at right angles to two parallel bars (2). The bars are secured by clamps (6) to a second angled iron (7) and the distance between the angle irons (1) and (7) can be adjusted to suit the size of the sheet. A third piece of angle iron (4) is attached by a hinge (3) to the first piece of angle (1). This third piece of angle has a handle which enables it to be swung against the edge of the sheet placed underneath the bars (2). The edge of the angle (4') then rounds the edge of the sheet. |
