US Patent 9156410 Roof-rack mechanism for automobile

A roof-rack mechanism includes one or more retaining devices attached to a track, and a lock device engaged with the track and the retaining device for detachably attaching the retaining device to the track. The retaining device includes a base member, and a bracket attached to the base member and mounted on the track. The bracket includes a recess formed between two legs for engaging with the track, and the lock device is engaged with the track and the legs of the bracket. The retaining device includes two flaps engaged onto the legs of the bracket and secured to the legs and the track with the lock device. The retaining device includes a cover pivotally attached to the base member with a coupler.