| 摘要 |
<p>A rotary lock is disclosed for preventing rotation of a shaft (24), such as a shaft used in a control rod drive for a nuclear reactor. The lock includes a stationary housing (52) for receiving the shaft, and an arm (54) extending outwardly from the shaft. At least one pin 66) is joined to the housing or circumferential restraint and is positionable in a withdrawn position (72) away from the arm for allowing the arm to rotate with the shaft without obstruction from the pin. The pin is also positionable in a deployed position (74) contacting the arm for preventing rotation of the arm and shaft. Means (76) are provided for selectively positioning the pin in the withdrawn and deployed positions. <IMAGE></p> |
