| 摘要 |
1,132,565. Making commutators. GENERAL MOTORS CORP. 17 Aug., 1967 [10 Oct., 1966], No. 37968/67. Heading B3A. [Also in Division H2] A disc-type commutator is made by punching radial slots 10 in a sheet of copper 11 and securing a heat-sealable paper sheet 12 to one surface of the plate to cover the slots. Two concentric arrays of holding tabs 16 are then punched through the composite sheet in the direction of the paper, the tabs being tapered to provide better anchorage in plastics material 20 which is subsequently injection or compression moulded on to the sheet. The composite sheet is punched to provide a correctly sized central locating hole and external periphery 11a and plastics material 20 moulded on to it. After moulding peripheral ring 11a is punched to leave projecting bars (18), Fig. 7 (not shown), which are then bent into hooks 18a on to which the armature winding leads are welded. |
