We demonstrate a novel optical dipole-force trap, which uses an intense blue-detuned conical hollow laser beam together with gravity to confine an ensemble of cesium atoms in a dark spatial region. Efficient cooling is provided by a 3D optical molasses in combination with inelastic reflections from the trapping field. The particular advantages of the trap are its experimental simplicity, the high loading efficiency, and a strong suppression of losses caused by ultracold collisions.