Abstract: This is provided a sealed adjustable lens focusing assembly including a lens barrel having a substantially tubular body and oppositely spaced barrel ends. The barrel is preferably sealed adjacent its opposite ends by optical windows, and a focusing lens is reciprocably mounted within the barrel for selective adjustment along a predetermined longitudinal focal axis. A longitudinally reciprocable drive member is provided which extends inwardly into the tubular body of the lens barrel for selectively moving the lens along the focal axis. An expandable tubular sealing member having a longitudinally expandable tubular wall with oppositely disposed retainer ends is concentrically telescoped over the lens barrel. The retainer ends are preferrably sealed in spaced relationship along the barrel, and the reciprocable drive member is connected to the focusing lens through the wall member intermediate the retainer ends.

Abstract: There is provided a quick-release coupling assembly for an endoscopic ocular, the assembly including an ocular mounting surface having an aperture and a longitudinal axis preferably passing through the center of the aperture on the mounting surface. A stationary guidewall is preferably radially spaced from and substantially concentric with the aperture of the ocular mounting surface, and the guidewall at least partially encircles the aperture to define an alignment recess adjacent the mounting surface for receiving the proximal end of an endoscopic ocular. At least one gripping jaw is provided for axial reciprocation and having a clamping position and a release position. The jaw comprises an inner tab which extends outwardly from the mounting surface, a retainer flange extending radially inwardly, and an engagement surface which may preferably be angularly disposed relative the axis.

Abstract: An input control includes first and second keyboard assemblies mounted on a common structural unit, an encoder on the unit, and a plurality of output conductors connected to the encoder for transmitting a binary coded signal when a key is actuated. The first keyboard assembly includes a set of keys that generate the same input control function signals as do the keys in the second keyboard assembly. The structural unit is mounted for rotation between an upright position in which only the first keyboard assembly is operator accessible and an inverted position in which only the second keyboard assembly is operator accessible. A latch is provided for locking the structural unit in either position.