| 摘要 |
1,173,490. Making springs. NORTH AMERICAN ROCKWELL CORP. 26 May, 1967 [22 Aug., 1966], No. 24512/67. Heading B3A. [Also in Division F2] A steel leaf-spring 10 has tapering ends and a central portion with flat parallel side faces to which axially aligned trunnion pins 24 are secured preferably by friction welding. The spring is made by taper rolling and treating a length of bar stock, or by flame-cutting from bar stock. The said side faces are formed by lateral compression of the mid-section of the bar, thereby displacing metal to cause an increased thickness, or by machining. |
