A skate having a base adapted to support a user's boot, a frame equipped with a plurality of wheels and having a transverse arch in its central portion, at least one rear quarter capable of sliding on the base and adapted to surround the heel zone and the lower leg of the boot. The base has two edges...http://www.google.co.uk/patents/US7314222?utm_source=gb-gplus-sharePatent US7314222 - Adjustable skate
