Patent ID: 6102345
Filing Date: 2000-08-15
Classification: A47B

Abstract:
An arm supporting base, comprising:an elliptic fixed base, in which a circular hole is formed;an elliptic movable base, which is disposed above the fixed base having a boss protruded down through the circular hole, the boss allowing the movable base to move freely in two dimensions;at least three ball bearings provided on the fixed base around the hole;a back plate larger in diameter than the circular hole to be fixed to a tip end of the bossbeneath the circular hole;a second circular hole in the fixed base such that the first circular hole and the second circular hole are formed at opposite portions along the long axis of the fixed base, the movable base has a second boss protruded down through the second circular hole; anda second back plate larger in diameter than the second circular hole to be fixed to a tip end of the second boss beneath the second circular hole.