The light fixture herein can assume multi-angle relationships to the ceiling grid system within a suspended ceiling system. The light fixture is suspended from the ceiling by support posts and the support posts are movable relative the grid system of the ceiling system and the back of the light fixture to permit the light fixture to be moved to a number of different locations.

A track mounting system for supporting equipment, such as a dental light, includes a pan-shaped carriage which is suspended from the track mounting system and to which the light or other equipment is attached. The track mounting system includes a pair of spaced, parallel tracks which are engaged by rollers rotatably mounted on inner walls of the carriage. At least one of the rollers is formed from a relatively hard material and is concave to mate with the complementary surface on one of the tracks to provide resistance against side loads. Other rollers are formed from a relatively soft material and are convex to provide a light frictional resistance to movement of the carriage along the tracks that inhibits drift, over-travel and other inadvertent movement of the carriage, while reducing noise.

A counterbalanced arm for a lighthead has an upper arm portion, a lower arm portion adapted at one end to be connected to the lighthead and at the other end for articulation about the upper arm portion, and a pivot assembly connecting the upper arm portion to the lower arm portion. The pivot assembly defines a pivot axis about which the lower arm portion pivots with respect to the upper arm portion. A lever mechanism is positioned so that a first end is positioned on one side of the pivot axis and a second end is positioned on the opposite side of the pivot axis, with the first end being pivotally secured to either the upper arm portion or the lower arm portion. A pull rod is positioned within either the upper arm portion or the lower arm portion and is pivotally attached to the second end of lever mechanism. The pivot assembly and lever mechanism are designed to enable the lower arm portion to pivot about the pivot axis from a position forming an acute angle with respect to the upper arm portion through a position forming a 180 degree angle with upper arm portion. A spring is operatively connected to the pull rod so that the spring provides a force to counterbalance the lighthead.

An arm assembly for supporting a surgical lighthead of a surgical light apparatus. The arm assembly includes a first arm and a second arm pivotally coupled to the first arm about a main pivot axis. A rod extends within an interior region of the second arm. A link is coupled to the rod to the first arm for pivoting movement about a link pivot axis that is spaced apart from the main pivot axis. A spring extends within the interior region of the second arm. The spring exerts a force on the rod and the link to counterbalance the surgical lighthead. A space filler includes an outer cover coupled to the first arm and formed to include a first slot and an inner cover nested within the outer cover and formed to include a second slot.

An arm assembly for supporting a surgical lighthead of a surgical light apparatus includes a first arm and a first clevis appended to the first arm and having a first stop surface and a second stop surface. The arm assembly also includes a second arm formed to include an interior region and a second clevis appended to the second arm and having a third stop surface and a fourth stop surface. The surigcal lighthead is supported by the second arm. The second arm and second clevis are pivotable about a 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