| 摘要 |
The present invention provides a method and system for a secondary lock for securing accessories in a radiation therapy system. The latching mechanism provided in accordance with the present invention includes a primary lock, a secondary lock, and a retainer shaft. The primary lock includes a head at a first end of the primary lock, and a protrusion at a first side of the primary lock. The secondary lock includes a main body, an engagement tang at a first end and a first side of the main body, and a locking tang at the first end and a second side of the main body. The retainer shaft is coupled to the primary lock and the main body of the secondary lock, where the secondary lock is fixedly positioned when the protrusion engages the accessory and the head resides between the engagement tang and the locking tang. The secondary lock creates a fail-safe locking system, such that the secondary lock causes the primary lock to continue to engage an accessory tray even if failure occurs elsewhere in the latching mechanism. This lowers the probability of failure of the latching mechanism significantly, resulting in a safer radiation therapy system. The secondary lock of the latching mechanism also remains in a disengaged position when no tray in inserted, allowing trays to be inserted without the need to press the release button first to set the secondary lock into the disengaged position.
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