Plantbed cover assembly

Claim 1

A plantbed cover assembly comprising two rectangular frames hingedly joined to each other along one of the marginal side members of each frame and adapted to be supported spaced above a plantbed with the hinged side members above the remaining marginal side members of the frames to thereby dispose both frames in oppositely inclined planes over the plantbed, each of the frames carrying a series of narrow vanes arcuate in cross section and formed of a rigid light-transmitting plastic material, said vanes being arranged parallel to each other and provided with support members which extend from the end of the vanes and freely through journalling apertures in the frame side members, and vane displacing means for rotating said support members in unison through ninety degrees to thereby move said vanes between a first position in which their concave surface faces upwardly and a second position in which their concave surface faces sidewardly, the side margins of adjacent vanes being closely spaced from but not engaging eaCh other when said vanes are in said first position, said vane displacing means comprising a plurality of pins each having an eyelet head and a shank portion, a throw bar extending parallel to and closely adjacent to one of the remaining marginal side members of the frame and resting on said vane support members, the eyelet head of the pins being pivotally attached to the throw bar and the shank portion of each pin extending at an acute angle from the throw-bar and rigidly secured to the extending support member of one of said vanes, whereby as said throw bar is moved upwardly and longitudinally said support members are rotated and the vanes attached thereto are moved between said first and second positions.