Patent ID: 7114318

Claim:
In a lawn mowing apparatus, a system for adjusting the height-of-cut of a cutting reel unit to a lawn to be cut, comprising: a cutting reel having grass-cutting blades for cutting growing grass; a bedknife; a cutting line defined at an interface between the cutting reel and the bedknife; a first frame supported on at least one support element that is supported on, and is movable along, the ground; a second frame supporting said cutting reel and said bedknife; a first actuator having a first portion connected to the first frame and a second portion connected to said second frame, wherein relative positions of said first and second portions are adjustable to raise and lower portions of said second frame with respect to said first frame, and including a powered motive mechanism that is activated to adjust said relative positions over a selectable range to set a pre-selected elevation of said cutting line; and a controller that is signal-connected to said first actuator, said controller operable to change said relative positions such that said elevation of said cutting line is set close to a surface of said lawn to be cut and corresponds to a selected height-of-cut.