Ground treatment apparatus

A ground treatment apparatus, comprising:

• a support body having an open bottom;
• at least one treatment implement supported by said support body and being movable through said open bottom of said support body, said at least one treatment implement having an implement head extending vertically;
• driving means carried by said support body for driving said treatment implement in a cyclical path relative to said support body, said cyclical path including both vertical and horizontal movement;
• said driving means including (a) a connecting link having a first end and a second end, said first end being pivotably connected to said support body;
• (b) an arm lever having a central portion, a first end pivotably connected to said second end of said connecting link, and a second end connected to said at least one treatment implement;
• (c) a drive mechanism pivotably connected to said central portion of said arm lever for cyclically driving said arm lever in a substantially circular motion;
• biasing means for biasing said implement to a substantially vertical disposition when said implement is stationary with respect to said support body;
• the support body being supported off the ground by ground-engaging support arrangements at leading and trailing ends, respectively, of the support body;
• the support arrangements being mounted on the body in an adjustable manner whereby the body is tiltable from a first position whereat the treatment implements can penetrate the ground, to a second position whereat all of the treatment implements are precluded from engaging the ground;
• and
• position-changing means for movement of the body between first and second positions and vice versa comprises an elongate handle manipulatable lengthwise between said first and second positions, the handle having a transverse groove engagable in the second position around a transverse pin of a locking mechanism, and a projection engagable in the first position against said pin.