| 摘要 |
<p>An expansion screw with a VH-shaped sliding housing includes a sliding housing (1), a screw rod (6) and a sliding bolt (2). The sliding bolt (2) is sleeved in the sliding housing (1), and one end of the sliding housing (1) has an internal conical shape. The screw rod (6) is sleeved in the sliding bolt (2). The end of the sliding bolt (2) which corresponds to the internal conical end of the sliding housing (1) stretches toward the outer side to form an external conical shape; and the other end of the sliding bolt (2) is provided with a top support (4). The screw rod (6) is sleeved in the sliding bolt (2), and the top support (4) provided on the end of the sliding bolt (2) can press against the sliding housing (1) and move it into a hole. When the screw rod (6) is twisted and fixed, it brings the sliding bolt (2) to move and expand the sliding housing (1) to press the hole and be cling to the hole wall, so as to achieve a better fixing effect. Because the screw rod or the bolt of the prior art is relieved from expanding the sliding housing, the screw rod can run through a plurality of expansion screws to make them deeply embed into multiple layers of interlayer walls, thus enhancing the fixing effect.</p> |
