| 摘要 |
This invention relates to a one-piece push-in type of fastener having side wings or fronds on a shank and adapted to prevent withdrawal of the fastener when inserted into a hole in which the shank is of H-shape in cross-section with wings or fronds on opposite plane surfaces of the shank and with the front surface of each wing or frond curved at its inner end to lead to the inner end of the rear surface of the next adjacent wing or frond. |
