| 摘要 |
954,111. Making brake adjusters; extruding; forging. BENDIX CORPORATION. Mar. 30, 1962 [April 7, 1961], No. 12420/62. Headings B3A, B3H and B3P. [Also in Division F2] A method of making a pivot nut for a brake adjuster comprises pressing a slug to form a cylindrically shaped body having one open end, swaging the open end portion to form a bottleneck restriction and internally threading the restriction. A slug, placed in a die 63 is pressed into a die cavity 65 by a stepped male die 67 to form a cylindrical body having a thickened portion 70 and a slotted end 28. The body is subsequently forced into an opening 76 of a die 78 to compress the portion 70 inwardly to form a bottleneck restriction 84 and produce a uniform outside diameter. Finally the portion 84 is internally thread rolled by a tool 85 to form a pivot nut 26. In a modification the nut is formed with a uniform outer diameter 88, necked at 96 by means of dies 92, 94 and threaded. The nut is packed with lubricant prior to the assembly of a screwed stem 32 comprising a serrated wheel 40 and a socket 52, having a slotted end 54, which is fitted over an extension 47 of the stem 32 and retained by dimpling 102. The complete assembly is subsequently fitted between the ends of a pair of brake shoes, the ends of which engage the slotted ends 28, 54 of the nut 26 and socket 52. Specification 833,729 is referred to. |
