| 摘要 |
1,144,627. Injection moulding umbrella frames. R. MEYER. 12 Feb., 1968 [15 Feb., 1967], No. 6873/68. Heading B5A. [Also in Division A4] A synthetic plastics blank for shaping into a one-piece umbrella frame is formed by injection moulding. The blank comprises parts 3, 5, 11 and 12 which become respectively the ribs, stretchers, crown and slider of the frame, the parts being joined by attenuated portions at 6, 7 and 8 which provide the pivots of the frame; a stick 1 may be included as an integral part of the blank, being joined to the strip 11 either at the middle 13 of the latter, as in Fig. 2, or at one of its ends. The stick preferably has a metal reinforcing rod 9 embedded along its length, the rod being inserted in the mould before injecting the plastics material. The mould, Fig. 4, for producing a blank as shown in Fig. 2 comprises separable parts with co-operating cavities la for the stick, 3a for the ribs, 11a for the strip 11 which eventually forms the crown, and 12a for the strip 12 forming the slider. At 6a, 7a and 8a the cavities are narrowed to provide the flexible attenuations 6, 7 and 8. When the stick is joined to the end of the crown strip a simpler mould consisting of only two separable parts 19, 20 may be used (Figs. 6, 7, not shown). |
