| 摘要 |
A fully automatic self-propelled self-guiding lawn mower in which guidance of the lawn mower is based on the principal of a magnet following a passive ribbon or wire of ferromagnetic material. The lawn mower includes two drive wheels located on opposite sides of the vehicle. Each drive wheel is connected to a drive shaft on the vehicle through a separate solenoid controlled clutch and each drive wheel is equipped with a separate electromagnet controlled brake. The drive shaft is turned at a constant rate of speed by a battery powered electric motor. The guidance system for controlling the movement and direction of the lawn mower includes a rotably mounted bar magnet horizontally aligned with the longitudinal axis of the vehicle and fixedly coupled to an electrical contact wiper arm that traverses an arcuate array of radially extending electrical contacts. Each one of the contacts is coupled to different ones or combinations of the actuators that operate the clutches and brakes and other mechanisms associated with the vehicle. The cutter assembly portion of the lawn mower includes two different sets of cutting blades, a first set for performing the majority of the cutting of the grass and a second set for trimming off ragged edges of grass that might be left by the first set of cutting blades. Cleaning vanes are also provided. The cutting blade tip speed is relatively very slow; being set at about 3500 feet per minute.
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