Patent ID: 7246684
Filing Date: 2007-07-24
Classification: B66F

Abstract:
1. A method of controlling boom angles in a boom lift vehicle, the boom lift vehicle including a tower boom pivotally coupled at one end to a vehicle base for tower lift function and rotatable relative to the vehicle base for swing function, and a main boom pivotally coupled to an opposite end of the tower boom for main lift function, wherein an angle relative to gravity is irrespective of the vehicle base or ground slope, the method comprising: defining a tower boom elevation angle as a maximum allowable tower boom angle relative to the vehicle base for transport; and controlling the main boom when the tower boom is below the tower boom elevation angle to maintain a main boom angle relative to gravity at a first set point angle when performing the swing function, during vehicle drive, and both when performing the swing function and during vehicle drive, the first set point angle being determined as the main boom angle (1) at a start of the swing function or vehicle drive, or (2) at a conclusion of the main lift function when combined with at least one of the swing function or vehicle drive.