Patent ID: 7389965

Claim:
An extension arm apparatus for supporting a user device, the apparatus comprising: a first endcap having a first section for connection to a mount and a second section connected to the first section thereof; a second endcap having first and second sections, the second section of the second endcap including a receptacle having an opening therein; a first channel having first and second ends, the first end of the first channel being connected to the second section of the first endcap, and the second end of the first channel being connected to the first section of the second endcap; a second channel having first and second ends, the first end of the second channel being connected to the second section of the first endcap, and the second end of the second channel being connected to the first section of the second endcap, the first and second channels defining a receptacle for a spring device; and a forearm assembly including an anti-loosening apparatus and a forearm extension having a first end operatively coupled to the second section of the second endcap and a second end for supporting the user device, the first end of the forearm extension including a shaft and at least one recess disposed in the shaft, the shaft being at least partly received within the opening in the second section of the second endcap, the anti-loosening apparatus comprising a washer and a fastener, the washer having at least one protrusion adapted to be received within the at least one recess to connect the washer to the shaft, and the fastener securing the second section of the second endcap, the washer and the shaft together so that the shaft is rotatable relative to the second section of the second endcap; wherein the anti-loosening apparatus permits rotation of the forearm extension relative to the second endcap while preventing loosening between the forearm extension and the second endcap during rotation.