| 摘要 |
680,355. Making wheels. DUNLOP RUBBER CO., Ltd., WRIGHT, J., and CHATTERTON, P. B. Nov. 8, 1950 [Dec. 21, 1949], No. 32791/49. Class 83 (ii). [Also in Group XXXIV] A wheel rim, such as for a cycle wheel, is made from strip of a cross-section comprising two hollow seamless flange-forming portions joined by an integral seamless web. An extruded light alloy strip of a cross-section comprising two annular portions 1A, Fig. 2, joined by a web 2A, is cold-drawn to a crosssection comprising two pear-shaped portions 1B, Fig. 3, joined by a web 2B, and is then cut into lengths which are circled and butt-welded. The hoops formed are rolled in a conventional hoop-rolling machine to the final cross-section with bead-retaining flanges 4, Fig. 3, and bead seats 5. In a modification the strip is cold drawn and rolled to the final cross-section before it is circled and joined.
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