SLIDE ANTENNUATOR

摘要

Apparatus for effecting a smooth, quiet, and reversible operation without backlash of the rotatable control member of an electrical device which member is rotatable to vary the electrical output characteristic of such device. A substantially rigid rotatable cam of the form of a helically twisted ribbon presenting opposed surface portions extending helically lengthwise of the axis of rotation of the cam, a resilient coupling between the cam and control member, cam drive means comprising a roller carriage slideable with low friction along a linear path determined by a fixed slide rod and roller means carried by the carriage spring biased into resilient contact with said opposed surface portions of the cam.