Hydraulic master cylinder

Claim 1

A master cylinder construction comprising a cylinder having two piston chambers of different diameters, a first piston and a second piston slidably disposed respectively in said piston chambers, reduced diameter stems projecting from the opposing end portions of the pistons, respectively, a flange formed around the outer periphery of each of the stems, one of said stems having a substantially spherical end surface abutting the opposed end of the other of said stems, a split sleeve consisting of at least two cooperating elements and having inwardly projecting portions on the inner circumferential surface thereof at the opposite ends respectively, said split sleeve being around said reduced diameter stems with the inwardly projecting portions engaging behind the respective flanges, and a sleeve member around the outer circumference of the split sleeve portions for retaining the split sleeve portions in the cylindrical shape, one of said pistons having an axially extending portion adjacent said reduced diameter stem, the diameter of said extending portion being complementary and smaller or equal to the inner diameter of the sleeve member, whereby when coupling the pistons, the sleeve member is positioned on the extending portion beforehand and thereafter is moved axially to surround the split sleeve portions.