Premier Mounts
AM500 Wall Mount
The AM500 is an articulating wall mount for displays up to 500 lbs. The mount holds flat-panel displays up to 82 in. The positive and negative tilt adjustment allows the mount to be installed level and plumb. The dual, articulating arms allow even the heaviest display to be pulled away from the wall for service or alignment. The mount features a 90 degree rotation that allows the display to be installed in landscape, portrait or any other arbitrary angled orientation. There are three different mounting brackets for different size displays.
http://www.premiermountsstore.com/premiermounts-am500-rotatingandarticulatingmegamount.aspx