Plough disk e.g. lobed disk, for plow, has lobe including hollow part and/or orifice managed in central part between center of disk and boundary lines of lobes, where center of disk is shifted from side of boundary line of disk

摘要

The disk (10) has a boundary line (11) including lobes (20) convexly rounded along boundary lines (21). Center (12) of the disk is shifted from a side of the boundary line of the disk. Each lobe includes a supplementary concavity modifying general concavity of the disk. The lobe includes a hollow part (24) and/or orifice managed in a central part between the center of the disk and the boundary lines of the lobes, where the disk is made of Teflon(RTM: fluoropolymer plastic resin). An independent claim is also included for a tilling machine including a seeder for depositing grains on a land.