Claims
- 1. A linear motion device, for independently controlling two sets of activators, comprising an inner lead member and outer lead member adapted to be connected to said activators, first and second threaded means for controlling the position of said lead members, a rocker arm assembly including a block to carry the load of said lead members when said rocker arm moves downward to pivot said first and second threaded means into engagement with one or the other of said lead members and a magnetically activated moveable slug for activating said rocker arm assembly.
- 2. The linear motion device of claim 1, wherein said inner and outer lead members are arranged concentrically.
- 3. The linear motion device of claim 2, further including a motor for independently positioning said inner and outer concentric lead members.
- 4. The linear motion device of claim 1, wherein said first and second threaded means comprise first and second roller nuts respectively.
- 5. The linear motion device of claim 1, further including controllable magnetic field means positioned in the vicinity of said movable slug for moving said slug toward a fixed pole.
- 6. The linear motion device of claim 5, further including a return spring for biasing said removable slug away from said fixed slug wherein said movable slug operates against the action of said spring.
- 7. The linear motion device of claim 3, further including a latching means for latching said inner lead member.
- 8. A sequentially operated, dual action control rod drive mechanism for independently positioning two control elements comprising:
- concentric inner and outer lead screws adapted to control the position of said control elements;
- first and second sets of roller nuts for engaging either one or the other of said concentric lead screws to control the axial position thereof;
- roller nut rocker arm assembly for pivoting said first and second roller nuts into said engagement;
- means for pivoting said rocker arm assembly including a moveably magnetic slug and a coil for activating said slug; and
- a thrust block to carry the load of said inner lead screw when said rocker arm translates downward.
- 9. The sequentially operated, dual action control rod drive mechanism of claim 8, wherein said pivoting means further includes a fixed pole positioned axially with said movable slug and a return spring biasing said movable slug away from fixed pole whereby when said coil is activated said movable pole is caused to move toward said fixed pole against the action of said return spring.
- 10. The sequentially operated, dual action control rod drive mechanism of claim 8, wherein said coil, when continuously energized, is operable to cause said rocker arm assembly and rotor to rotate to thereby control the position of the lead screws.
- 11. The sequentially operated, dual action control rod drive mechanism of claim 8, including pin and slot means associated with said roller nut rocker arm assembly for permitting said assembly to pivot and translate.
- 12. The sequentially operated, dual action control rod drive mechanism of claim 8, including latching means for latching said inner lead screw.
- 13. The sequentially operated, dual action control rod drive mechanism of claim 10, further including a locking means for engaging said lower roller nuts with said outer lead screw whenever said outer lead screw is not in a fully inserted position.
Government Interests
The United States Government has rights in the invention pursuant to Contract No. EY-76-C-11-0014 between the United States Department of Energy and the Westinghouse Electric Corporation.
US Referenced Citations (11)