| 摘要 |
A locking mechanism for a radiographic projector, the radiographic projector being adapted to hold a radioactive source in a source holder, and comprising a housing defining a channel along which the source holder is adapted to be moved between a storage position inside the housing and an exposed position outside of the housing, wherein the locking mechanism is adapted to lock the source holder in a storage position and comprises a first locking member moveable between a locked state preventing movement of the source holder out of the storage position and an unlocked state allowing movement of source holder out of the storage position, wherein the first locking member is biased towards the locked state, a second locking member being adapted to prevent movement of the first locking member to the locked state when the source holder is not in the storage position, and to allow movement of the first locking member to the locked state when the source holder is in the storage position and a third locking member, adapted to engage the first locking member, as a result of movement of the first locking member from the locked state to the unlocked state, to retain the first locking member in the unlocked state, and adapted to disengage said first locking member when said second locking member prevents movement of the first locking member to a locked state. |
