| 摘要 |
<p>A masonry screw has a shank (14) having a leading end (16), a trailing end (18) and a longitudinal axis (20) and a thread (22) winding around the shank. The thread has a leading flank (24) and a trailing flank (26). Between an adjacent leading flank (24) and trailing flank (26) the shank has a non-uniform diameter to define a depression (28) between those adjacent leading and trailing flanks. The depression has a first inclined face (42) that faces the trailing end (18).</p> |
