The components of an adjustable light fixture mounting assembly are secured during adjustment of a light in a lighting system. A knuckle joint with a locking taper secures an upper knuckle half to a lower knuckle half. The locking taper secures the adjustment of the knuckle halves, even if the knuckle...http://www.google.co.uk/patents/US7458552?utm_source=gb-gplus-sharePatent US7458552 - Adjustable light fixture mounting assembly
