| 摘要 |
<p>A braking device for a remote actuation system includes a plurality of balls or rollers interposed between a surface of a rotary member and a notched external surface of a housing. A cage for the balls or rollers is frictionally engaged with the rotary member so that when the case is free, it rotates with the rotary member and the balls or rollers moving in their notches thereby brake the rotary member. An electromagnetically operable device is coupled to the cage so that when energized it holds the cage in a central position so that braking does not then occur.</p> |
