| 摘要 |
986,966. Making cop bobbins. ALCAN ALUMINIUMWERKE G.m.b.H. Feb. 6, 1964 [Feb..6, 1963], No. 5046/64. Drawings to Specification. Heading B3A. [Also in Division B8] A method of manufacturing a yarn spoolfor example a cop-comprises pressing a cupshaped workpiece from a round metal blank, drawing the workpiece such that an internally thickened wall portion is left adjacent the base, and severing the base to provide a spool with a spindle-engaging, inwardly thickened wall portion at one end. The wall portion may have a polygonal internal boundary or recesses to correspond with radial pins on the spindle. |
