| 摘要 |
<p>A device for actuating by remote control a row of pushbuttons in a television or radio receiver wherein a mechanism automatically releases a previously actuated pushbutton in response to actuation of another pushbutton. The device has a series of parallel slides each coupled to one of the pushbuttons, a feed screw which can be driven stepwise in clockwise and counterclockwise directions, and a follower which meshes with and moves lengthwise of the feed screw when the latter rotates. The slides have coplanar projections and the follower has two angularly and axially offset cams one of which engages successive projections in front of it to actuate the respective pushbuttons in response to rotation of the feed screw in one direction and the other of which engages successive projections in front of it to actuate the respective pushbuttons in response to rotation of the feed screw in the other direction. The follower is pivoted in response to changes in the direction of rotation of the feed screw to place the one or the other cam into the plane of the projections and the follower comes to rest in such positions that it cannot interfere with manual actuation of the pushbuttons.</p> |
