Abstract: A portable, modular greenhouse system that can be used to protect plants from harsh conditions. A green house according to the invention comprises a frame and a cover. The frame preferably comprises at least one panel constructed from a mesh of rigid wire, with a spacing between adjacent wires which is large enough to permit a gardener's hand to pass therethrough. The panels are preferably flexible and resilient, so that they return to their original shape after being bent. The cover preferably has sleeves formed in opposite edges thereof. Slats may be inserted into the sleeves, so that when the cover is on the frame the slats are located near the bottom of the frame, thereby weighing down the cover to keep it in place. The ends of the slats may be inserted through the mesh of the panels to further secure the cover to the frame.

Abstract: A portable, modular greenhouse system that can be used to protect plants from harsh conditions. A green house according to the invention comprises a frame and a cover. The frame preferably comprises at least one panel constructed from a mesh of rigid wire, with a spacing between adjacent wires which is large enough to permit a gardener's hand to pass therethrough. The panels are preferably flexible and resilient, so that they return to their original shape after being bent. The panels may be manufactured in a plurality of standard sizes, so that they may be used to construct frames varying widely in size and shape. The frames are preferably able to be flattened for storage when the greenhouse is not being used. The cover preferably comprises a piece of light-transmitting plastic sized to fit over the frame. The shape of the cover will depend on the frame configuration. The cover preferably has sleeves formed in opposite edges thereof.

Abstract: The present invention provides an improvement in manhole casting positioning apparatus and methods. In particular there is provided a casting positioning apparatus; for positioning a casting in relation to an upper end of a manhole, which comprises an inner sleeve comprising a rigid hollow cylinder having an annular flange extending around the upper circumference thereof. The diameter of the cylinder is less than that of the manhole lid opening. An annular resilient rubber ring or skirt whose inner diameter is slightly less than the outer diameter of the inner sleeve and whose outer diameter is greater than that of the manhole lid opening is stretched around the outer surface of the cylindrical inner sleeve. The lower end of the cylindrical inner sleeve is inserted into the upper end of the manhole, and lowered until the lower surface of the rubber ring rests on the upper edge of the manhole lid. Pressure is then applied downwardly on the flange of the sleeve to push it down to the desired height and slope.

Abstract: The present invention provides a casting positioning apparatus, which is used to position a casting in relation to an upper end of manhole. The apparatus includes a sleeve unit which has open upper and lower ends, and which is moveable in lateral dimensions between a first position and a second position. In the first position, the lower end of the sleeve unit can freely engage with the upper end of the manhole. In the second position, the upper end of the sleeve unit can support the casting in a position mounted on it, while at the same time an engaging section of the lower end of the sleeve unit can frictionally engage against a side of the upper end of the manhole. Such frictional engagement is with sufficient force such that the sleeve and the mounted casting can be supported by such engagement, while allowing the upper end of the sleeve to be moved with respect to the upper end of the manhole. By such means, the casting can be positioned with respect to the upper end of the manhole.