Automatic lawn mower

Details Automatic lawn mower Automatic lawn mower

1976-08-25

1979-01-09

Pekar, John A.

Motor vehicles

Compensating devices

56 102, 180 98, 250202, B62D 504

Patent

active

041334043

ABSTRACT:
An automatic lawn mower operable to cut about the periphery of a lawn, moving inwardly, and automatically shutting off at the conclusion of the cutting operation. A cut border is placed about the periphery of the lawn to be mowed and also about any obstacles within the area. The mower utilizes an array of light sensitive resistors and a columnized light source to detect the transition between cut and uncut grass in order to track in an irregularly shaped spiral to the center of the lawn. A portion of the sensor system provides for proper guidance of the mower around the cut perimeter of any obstacles in the cutting area. The mower may utilize an array of light sensitive resistors, a columnized light source and actuated light reflectors to detect the transition between cut and uncut grass in order to track in an irregularly shaped spiral to the center of the lawn.

REFERENCES:
patent: 2074251 (1937-03-01), Braun
patent: 2751030 (1956-06-01), Null
patent: 3152317 (1964-10-01), Mayer
patent: 3881568 (1975-05-01), Ando
patent: 3924389 (1975-12-01), Kita
patent: 3972381 (1976-08-01), Gail

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