| 摘要 |
<p>A one-piece wall anchor capable of being driven axially into a hole (10) drilled in masonry (11) to cause the inserted anchor to lodge securely therein to hold a fixture (12) or other part against the masonry surface. The anchor is constituted by a shank (13) formed of resilient material whose memory is such that when the shank is forcibly deformed, it seeks to maintain its original shape, the shank (13), being integral with a drivable head (15) and having a maximum cross-section which is substantially equal to the diameter of the hole (10). The shank (13) is pre-shaped to include at least one undulation which deviates from the longitudinal axis (X) passing through the head (15) to create a shank bend having a peak (P) on one side of the shank and upper (B2) and lower bases (Bi) on the other side thereof. When, therefore, the anchor is driven into the masonry hole (10), this force seeks to straighten out the bend, the resultant deformation thereof exerting outward pressures against large contact areas on the wall of the hole at the peak (P) and at the bases of (B1,B2) of the bend, which multilevel pressures strongly resist axial withdrawal of the shank (13).</p> |
