Patent ID: 8360408

Claim:
An apparatus for supporting a fixture in a desired position, the apparatus comprising: a first pivot joint assembly including a first hub rotatable about a first axis; a second pivot joint assembly coupled to said first pivot joint assembly for selective positioning of said second pivot joint assembly about said first axis, said second pivot joint assembly including a second hub rotatable about a second axis orthogonal to said first axis; a third pivot joint assembly including a third hub rotatable about a third axis, said third axis being parallel to said second axis; a link arm coupled between said second hub and said third hub; said first, second, and third pivot joint assemblies each comprising: a brake drum having first teeth, a brake shoe having second teeth complementary to said first teeth of said brake drum, a biasing member biasing engagement between said first teeth and said second teeth, each said hub coupled to a respective one of said brake drum and said brake shoe such that said hub is fixed against rotation when said first teeth are in engagement with said second teeth, and an actuator operative to move one of said brake shoe or said brake drum relative to the other of said brake shoe or said brake drum for selective disengagement of said first and said second teeth.