Patent ID: 9415986
Filing Date: 2016-08-16
CPC Classification: B66F

Claim Text:
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 manoeuvre the basket or cage, the controls comprising: an emergency switch which normally allows the flow of electricity and is operable to stop electrical supply and prevent movement of the basket or cage; a function enable switch which is normally open to cut electrical supply and prevent movement of the basket or cage and must be held closed by the operator to allow the flow of electricity and enable the operator to operate the controls; an alarm which is either audible, visual or audible and visual; a switch activation device proximate to the controls; a primary relay connected to the function enable switch; a secondary relay connected to the emergency switch; and the primary and secondary relays being controlled by a programmable control module connected to the switch activation device, the function enable switch, and the alarm, wherein the control module is programmed to prevent movement of the basket or cage and activate the alarm by cutting electrical supply to the function enable switch when the function enable switch is closed and the switch activation device is activated, and wherein if the electrical supply to the function enable switch cannot be cut, the control module is further programmed to prevent movement of the basket or cage and activate the alarm by operating the emergency switch to cut the electrical supply.