Shade roller latch

A latch for a shade roller having a tubular roller, a stem to be non-rotatably mounted, said stem being arranged coaxially in said roller, and a drive spring engaged between the roller and the stem, said latch comprising a cylindrical shell connected with the roller for rotation therewith, a body arranged coaxially with and surrounded by the shell and fixed to the stem, and a ball, the body having a through bore extending on a diametrical line transverse said body receiving said ball for free movement therein, and the shell having at least one recess in the inside circumferential surface thereof, said bore allowing movement of the ball partly out of each end thereof to be in part received by the recess for locking the body and the shell against relative rotational movement.