| 摘要 |
<p>In this support, the plumb line is fixed to a component which can be moved along a groove in the main part of the device which is a L-shaped component. This main part is fitted with two jaws each mounted on a screw whose head is fitted with a small sliding rod so that the screw is easily turned to adjust the jaw. Due to the groove, the front and side can be plumbed without moving the support. Using this support, it is easy to plumb a door frame and fix it at the same time. Also a single person can fix the door frame as the plumb line is mounted onto the door frame.</p> |
