Rolling tarp enclosure system

A tensioning mechanism for a movable, tarp enclosure system having a tarp cover, support rails, a plurality of substantially U-shaped bows connected to and supporting the tarp cover, and movable carriages connected to lower ends of said bows and which move along the support rails, the tensioning mechanism comprising:

• first, second, and third arms;
• and
• first and second support brackets which are connected together with the first-third arms in a substantially triangular, adjustable configuration in which the first arm is rotatable relative to support brackets and when the first arm is rotated, the first bracket moves linearly along the first arm toward and away from the second bracket, wherein
• the first and second support brackets are configured to be connected to a support surface,
• the second arm has one end thereof pivotally connected to the first bracket such that the first end of the second arm moves together with the first bracket,
• the third arm has one end thereof pivotally connected to the second bracket, and the second and third arms having second ends thereof pivotally connected together,
• the third arm has an engagement member provided on the second end thereof which is configured to operatively engage a vertically intermediate portion of an end one of the bows, and
• the third arm has a length adjusting mechanism for adjusting a length thereof.