×

Position control arrangement, especially for a surveying instrument, and a surveying instrument

  • US 20090133273A1
  • Filed: 11/10/2008
  • Published: 05/28/2009
  • Est. Priority Date: 09/20/2002
  • Status: Active Grant
First Claim
Patent Images

1. An apparatus for controlling angular movement of a movable unit between an existing angular position and a desired angular position, comprisingan electric direct drive motor adapted to rotate said movable unit, said motor having a shaft defining an axis of rotation of the movable unit and being selectively operable in one of a normal mode for rotating said movable unit to a desired position and a friction mode permitting incident force to rotate said movable unit from said desired position to a new position;

  • a mode control unit to enable said friction mode of said motor upon the application of said incident force; and

    a friction control unit connected to said motor in said friction mode, and disconnected from said motor in said normal mode.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×