| 摘要 |
<p>The longer leg of the assymetric fastener attaches to the board (P) and the tip of the shorter arm (e) applies retentive ressure to the notice, the clip is made of a stiff coil spring or a spring steel rod, the longer end being a push fit in a peg board hole. Alternatively, it may have a 'Y' shaped arm cantilevering from a rectangular block (d), the arms curving over (f) and back (e) to meet the retentive function. The block may slide in alternative 'T' section grooves (a) in a special board (p).</p> |
