Patent ID: 8789661
Filing Date: 2014-07-29
Classification: B66B

Abstract:
1. In a vertical reciprocating conveyor having a carriage mounted for movement in a support frame between different designated vertical levels, a door assembly mounted on the support frame at one of the designated levels for gaining access to the carriage when the carriage is at the one vertical level, and moveable between an open position and a closed position relative to a doorway formed in the support frame at the one designated level, the improvement comprising: a door frame having a pair of vertical side members provided with guide tracks and connected at upper ends thereof by a transverse header; a visual warning barrier including an elongated bar having opposite ends slidably supported in the guide tracks, wherein the visual warning barrier is movable between a raised, inoperative position and a lowered, operative position in which the visual warning barrier extends across the doorway to warn against entry therethrough, the warning barrier moving from the raised, inoperative position to the lowered, operative position upon movement of the door assembly to the open position when the carriage is located away from the one designated level; and an electromagnetic assembly connected to the header and operable to hold the elongated bar in the raised, inoperative position.