Patent ID: 8918951

Claim:
A blower vacuum device comprising: a housing comprising a motor located therein, the motor being operable with a first switch; a fan located in the housing, the fan being drivable by the motor; an attachment which is releasably attachable to the housing and arranged to cover the fan when attached to the housing, the attachment comprising an actuating projection attached to the attachment for actuating the first switch; and an interlock mechanism between the attachment and the housing, the interlock mechanism comprising an engageable lug attached to the attachment and a moveable cam surface, the moveable cam surface being mechanically coupled to a blocking plate wherein the blocking plate is moveable between an unblocking position when the engageable lug engages with the moveable cam surface and a blocking position when the engageable lug is not in engagement with the moveable cam surface; wherein the blocking plate prevents the actuating projection from actuating the switch when the blocking plate is in the blocking position.