US Patent 6910742 Wheel

A journal for coupling a wheel to an axle has a main tubular body portion with a reception space for the axle and a separate locking element. The locking element is mounted in a cradle for pivotal movement about a pivot axis from a release position in which the axle is removable from the reception space to a position in which the axle is secured in position is the reception space. A biasing member such as a magnet, a spring or a tube of resilient material biases the locking element into the secured position.