A rack arm rotatably mounts to a cross bar of a rack system. Multiple cross sectional shape cross bars are accommodated, enabling use with different rack styles. The rack arm rotates into position to engage an item of gear placed in the rack for securing the gear item to the rack....http://www.google.com/patents/US6439397?utm_source=gb-gplus-sharePatent US6439397 - Retention arm for gear racks
