| 摘要 |
An overtravel brake system (32) for a storage and retrieval system (10) which is automatically actuated when the load carriage lift motor (26) is deenergized and the load carriage moves downward. The brake system includes a dog (54) mounted on the load carriage and engageable with the mast (22), the dog being actuated by a chain or cable (124) which applies an actuating force to the dog actuating mechanism only after the load carriage has traveled a predetermined distance. The chain or cable is connected to the output member (90) of a clutch mechanism (76) operable in response to relative movement between the load carriage and the mast, and which is held in a disengaged condition when the lift motor is energized and is automatically shifted to an engaged condition when the lift motor is deenergized. |
