Abstract: A shade roller latch comprises a latch member in a bore in a stationary stem. This latch member can fall by gravity into a notch in the inside circumferential surface of a shell rotatable with the shade roller to be received in part by this notch and lock the roller against rotation in relation to the stem.

Abstract: A ball clutch mechanism in a spring motor for a tubular roller-blind rod or the like. The clutch includes a hub or outer clutch member rotatably mounted on a cylindrical portion of a shaft made of plastics and forming an inner clutch member including clutch ball receiving recesses. The hub has straight ball channels and is made of plastics in one piece. The hub is locked in an axial position on the shaft by a locking pin engaging a groove in the shaft. The locking pin has a stop arm located to retain the respective clutch ball in the ball channel.