Safety device for ensuring the locking of a wheel hub, especially for wheelchairs

摘要

The mechanism consists of a hub (1) with a quick-fit assembly and a deep cavity in its outer end (1a) to receive a toothed ring (12) which acts as a guide/positioner for a locking/release axle. The ring's teeth have sloping surfaces which interact with a cap (14) which is able to move relative to a pusher fixed to the axle, and can be rotated between positions allowing the locking or release of the hub. The ring teeth have horizontal (12b) and progressively sloping (12c) surfaces to interact with lugs (14b) on the inside of the cap, the outer surface of which lies in the same plane as the outside of the hub and has recesses to facilitate positioning.