| 摘要 |
A centerline sight device is mounted on a tractor to enable the driver to automatically steer the tractor along a center row or longitudinal mark to align the tractor with respect to furrows of crops in a field. The sight device includes a slight arm housing mounted on the forward end of the tractor, with a sight arm operably mounted on the housing to move transversely with respect to the longitudinal axis of the tractor. A motor is mounted on the sight arm housing to move the sight arm in response to selective activation by the tractor driver. A lamp assembly housing is mounted on the tractor forwardly of the seat and rearwardly of the sight arm, and has a plurality of lamps spaced transversely across the top perpendicular to the longitudinal axis of the tractor. The lamps are electrically connected to the motor and sight arm so as to light a particular lamp in response to the position of the sight arm. A plurality of switches are mounted directly below the lamps, and are electrically connected to the sight arm motor, so as to enable the tractor driver to selectively position the sight arm and form a sight line through a selected lamp and the sight arm for guiding the tractor.
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