| 摘要 |
A step selector for a stepped transformer has an electrically insulating cylindrical wall provided with fixed contacts, e.g. at different levels and, for each contact level, a radial arm composed wholly of electrically insulating material is affixed to a cylindrical shaft rotatable about the axis of the cylinder and within the latter. The radial arm has a flange lying against the shaft and extending over substantially 120 DEG of an arc thereof. An inward projection on the flange engages a recess in the shaft and the flange is held against the shaft by at least one band of fibrous material impregnated with a self-hardening synthetic resin. The outer end of the arm carries a contact bridge slidable on a contact ring which nonrotatably surrounds the shaft and lies in the plane of the respective fixed contact which is engageable by the bridge.
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