SAFETY DEVICE FOR AN AERIAL LIFT

摘要

An aerial lift having a basket or cage having a control panel for an operator standing in the basket to maneuver the basket to a desired location, a safety switch means operable to prevent further movement of the basket in unsafe conditions, and a safety device comprising a load cell or strain gauge on the cage and an auxiliary safety switch operatively connected to the load cell via an amplifier is connected in series with the safety switch means, the auxiliary switch being operable to cut off power to the safety switch means when the sensed load on the cage exceeds a predetermined value, typically if the load strikes a stationary object.

主权项

1. A safety device for an aerial lift having a basket or cage with controls which permit an operator standing in the basket or cage to maneuver the basket or cage to a desired location, the controls for the aerial lift additionally comprising a safety switch operable to prevent further movement of the basket or cage, wherein:
the safety device comprises a load cell or strain gauge and an auxiliary safety switch operatively connected to the load cell or strain gauge and connected in series with the safety switch, the auxiliary safety switch being operable to cut off power to the safety switch when a load value is sensed that exceeds a predetermined load value indicating a hitting event; and the basket or cage of the aerial lift has a floor surrounded by a safety barrier, and the load cell or strain gauge of the safety device is fixed to a material storage rack, for use in supporting lengths of material, secured within the safety barrier and standing on the floor of the basket or cage of the aerial lift.