Patent ID: 7207419

Claim:
A lock system for a lift having a single extendable mast, the lock system comprising: a first stationary support beam disposed adjacent to a first side of the mast; a second stationary support beam disposed adjacent to a second side of the mast; a lift frame connected to the extendable mast such that the lift frame is movable with respect to the first and second stationary support beams; a first lock attached to the movable lift frame and operable between a plurality of locked positions wherein the first lock is engaged with the first stationary support beam to lock the movable lift frame to the first stationary support beam and an unlocked position wherein the first lock is disengaged from the first stationary support beam to unlock the movable lift frame from the first stationary support beam; a second lock attached to the movable lift frame and operable between the plurality of locked positions wherein the second lock is engaged with the second stationary support beam to lock the movable lift frame to the second stationary support beam and the unlocked position wherein the second lock is disengaged from the second stationary support beam to unlock the movable lift frame from the second stationary support beam; and a lock control mechanism operatively coupled to the first lock and the second lock to simultaneously operate the first lock and the second lock between the plurality of locked positions and the unlocked position.