| 摘要 |
A system includes a moveable member configured to permit a user to manually move at least a portion of the moveable member to permit an object coupled to the moveable member to be manipulated in space and thereby facilitate the performance of a task using the coupled object. The moveable member is configured to couple to at least a first object and a second object that is interchangeable with the first object and has a substantially different weight than the first object. A brake is configured to limit manual movement of at least the portion of the moveable member to inhibit manipulation in space of the coupled object, both when the moveable member is coupled to the first object and when the moveable member is coupled to the second object.
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