| 摘要 |
<p>Collapsable frame for drawings, photographs etc comprises moulded strips joined by connecting pieces. The shape of the connecting pieces and the recesses set in the region of the connecting plane of two moulded strips are designed so that the pieces can be inserted in an detached from the recess in the direction which is vertical to the plane of the frame which is to be produced. These recesses are dovetailed and located on the reverse side of the strips. Pref. the connecting pieces are of Teflon (RTM).</p> |
