In a scroll compressor equipped with fixed scroll member 1 and orbiting scroll member 2 having step portions 4, a convex side end of at least one step portion of each of scroll members 1 and 2 has chamfered portions 1f and 2f which are formed lower than an extrapolated line of an upper edge....http://www.google.com/patents/US6758658?utm_source=gb-gplus-sharePatent US6758658 - Scroll compressor
