Patent ID: 6012821
Filing Date: 2000-01-11
Classification: A61G,F16M,F21V,F21W,Y10S

Abstract:
An arm assembly for supporting a surgical lighthead of a surgical light apparatus, the arm assembly comprisinga first arm,a first clevis appended to the first arm and having a pair of separated first flanges, the first clevis including a first stop surface and a second stop surface,a second arm formed to include an interior region, the surgical lighthead being supported by the second arm,a second clevis appended to the second arm and having a pair of separated second flanges, the second clevis including a third stop surface and a fourth stop surface,a pair of pivot pins pivotably coupling each of the pair of second flanges to a respective one of the first flanges so that the second arm and second clevis are pivotable about a main pivot axis relative to the first arm and first clevis, the pivot pins being spaced apart to define a gap therebetween,a rod extending within the interior region of the second arm,a link coupled to the rod and pivotably coupled to the first clevis for pivoting movement about a link pivot axis that is spaced apart from the main pivot axis,a spring extending within the interior region of the second arm, the spring exerting a force on the rod and the link to counterbalance the surgical lighthead, andwherein the second arm and second clevis are pivotable about the main pivot axis relative to the first arm and first clevis between a first position in which the third stop surface engages the first stop surface to limit pivoting movement of the second clevis and second arm in a first direction and a second position in which the fourth stop surface engages the second stop surface to limit pivoting movement of the second clevis and second arm in a second direction, the link moving into the gap between the pair of pivot pins during movement of the second arm and second clevis between the first position and the second position.