Harrow bearing

A harrow comprising:

• a ground working portion including a plurality of tool elements arranged in a series of groups, each group of tool elements being hooked together with its adjacent group of tool elements to form flexible connections between the groups, each group formed of at least two tool elements defining therebetween a central space along a longitudinal axis and each tool element including a loop portion and a pair of spikes extending from the loop portion;
• a bearing assembly engaged at each end of the ground working portion, the bearing assemblies each including a housing, a shaft supported within the housing and having an outboard end, the outboard end extending out through an opening in an end of the housing, a bearing disposed between the shaft and the housing to permit rotation of the shaft within the housing, the bearing assemblies being engaged to the ends of the ground working portion by a pivotally moveable connection to permit a degree of pivotal movement at the connection between the bearing assembly housing and the ground working portion and the bearing being positioned within the central space of a group of tool elements with the outboard end of the shaft extending out from the end of the ground working portion;
• and
• a support frame including a first arm and a second arm spaced from the first arm, the first arm engaging the shaft of the bearing assembly at a first end of the ground working portion and the second arm engaging the shaft of the bearing assembly at the opposite end of the ground working portion and the first arm and the second arm being drivable apart to hold the ground working portion under tension along its length.

A bearing assembly comprising:

• a housing;
• a shaft supported within the housing and having an outboard end extending through an opening in an end of the housing;
• a bearing member disposed between the shaft and the housing to permit rotation of the shaft within the housing, the bearing member having an inner end and an outer end, the outer end being adjacent the opening in the end of the housing and the inner end being opposite the outer end;
• and
• a harrow ground working portion engaging means extending out from the housing and positioned between the inner and of the bearing member and the outboard end of the shaft, the harrow ground working portion engaging means including a pair of diametrically opposed protrusions and a pair of diametrically opposed apertured plates.

A rotary spike harrow comprising:

• a ground working portion including a plurality of tool elements arranged in a series of groups, each group of tool elements being hooked together with its adjacent group of tool elements to form flexible connections between the groups, each group formed of at least two tool elements defining therebetween a central space along a longitudinal axis and each tool element including a loop portion and a pair of spikes extending from the loop portion;
• and
• a bearing assembly engaged at each end of the ground working portion, the bearing assemblies each including a housing, a shaft supported within the housing and having an outboard end extending through an opening in an end of the housing, a bearing member disposed between the shaft and the housing to permit rotation of the shaft within the housing, the bearing having an inner end and an outer end, the outer end being adjacent the opening in the end of the housing and the inner end being opposite the outer end, and a harrow ground working portion engaging means for engaging the ground working portion, the harrow ground working portion engaging means of at least one of the bearing assemblies extending out from the housing and positioned between the inner end of the bearing member and the outboard end of the shaft and the harrow ground working portion engaging means including a pair of diametrically opposed protrusions each for accepting the loop portion of a tool element to secure the ground working portion to the bearing and a pair of diametrically opposed apertured plates extending out from the housing and a member secured onto each apertured plate and positioned to engage the one of the spikes of two tool elements.