Visual warning barrier for door assembly used in a vertical lifting system
AssigneePflow Industries, Inc.
InventorGene M. Barth
Life of this patent
Estimating the term…
Abstract
A vertical reciprocating conveyor has a carriage mounted for movement in a support frame between different designated vertical levels, a door assembly mounted on the support frame for gaining access to the carriage when the carriage is at the one designated level. A visual warning barrier is movably mounted between a raised, inoperative position and a lowered, operative position across a doorway formed in the support frame at the one designated level. The visual warning barrier is automatically moved 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.
Claims19
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 visual warning barrier 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.
A safety arrangement for use with a vertical reciprocating conveyor having a carriage mounted for movement in a support frame between different designated vertical levels, and a door assembly mounted on the supporting guide structure on at least one of the designated vertical levels for gaining access to the carriage when the carriage is at the at least one designated vertical level, the door assembly being movable between an open position and a closed position, the safety arrangement comprising:
- a visual warning barrier movably mounted on the support guide structure between a raised, inoperative position and a lowered, operative position across a doorway formed in the supporting guide structure at the one designated level, the warning barrier being automatically moved from the raised, inoperative position to the lowered, inoperative position upon movement of the door assembly to the open position when the carriage is located away from the one designated level.
A vertical reciprocating conveyor comprising:
- a supporting guide structure defined by a set of vertical columns;
- a carriage mounted for movement in a passageway formed in the supporting guide structure between different vertical levels;
- a door assembly mounted on the supporting guide structure at one of the designated vertical levels for gaining access to the carriage when the carriage is at the one designated vertical level, the door assembly being movable between open and closed positions relative to a doorway formed in the supporting guide structure at the one designated level;
- and
- a warning device movably mounted on the supporting structure and automatically activated to move from a stored position to a warning position across the doorway upon movement of the door assembly to the open position when the carriage is located away from the one designated level.
Dependencies are inferred from the claim text.