| 摘要 |
<p>The method involves forming open profile for base structure of metal sheet by reshaping a base structure of metal sheet. The base structure of metal sheet is bent into U-shaped profile. Two legs (14,16) and bar (18) are provided in U-shaped curved metal sheet profile. The legs are funnel shaped and are extended at the base of bar. Independent claims are included for the following: (1) balancing weight; and (2) rotary base structure.</p> |
