Steering system for self-propelled lawnmower - uses buried cable carrying alternating current for mower magnetic field sensor

摘要: Steering system for self-propelled lawnmower has a conductor cable supplied with alternating current laid in the ground of lawn uniform distribution, so that magnetic field which results can be sensed by feeler on lawnmower, to guide continuously over whole surface. Pref. automatically stops meeting an obstacle, and its drive is stopped if fails steering or no induced signal sensed. The consists two coils mounted forward crossbeam carried arm, both sides symmetrically mowers long axis.