Plastic-made reinforced structure

摘要

A plastic-made reinforced structure comprising a thermoplastic resin-made plate and cylindrical hollow rib(s) made of the same resin as that of said plate, connected to at least one side of said plate perpendicularly to the side so that the plate and the rib(s) form one piece, in which structure the following relationships hold: d1>/=20 mm, 1>d1/d2>/=0.7, H>/=30 mm, 1>/=d1/H>/=0.3, and 1>t1/t2>0.3 wherein d1 and d2 are the inside and outside diameters of each rib at the root of the rib, i.e. the joint of the rib to the plate; H is the length of each rib from the root to the front end; and t1 and t2 are the rib thicknesses at the front end and at the root.