A roller skate has a truck supporting its rear-wheel axle on which a rearwardly extending rocker is swingable about a horizontal axis, the rear end of this rocker carrying a control roller while its front end engages or forms a pair of pressure elements disposed between the rear wheels. Normally, with...http://www.google.fr/patents/US4453726?utm_source=gb-gplus-shareBrevet US4453726 - Roller skate or the like with brake attachment
