Variable-width-beam light apparatus

摘要

A variable-width-beam light apparatus is provided having a lamp and reflector assembly in which a lamp is supported for selective axial displacement along a longitudinal optical axis with respect to a focal point of the reflector to enable adjustment in the width or angle of divergence of an emitted beam of light. The lamp is selectively positioned by a rotatable knob carried by a lens of the assembly and positioned exteriorly at the front of the lens for operation. The rotatable knob connects with a shaft coupled by screw threads with a lamp engaging cylinder that is axially slideable in a tubular guideway such that rotational movement is translated to longitudinal movement to effect and control axial displacement of a lamp. The lamp is resiliently biased in a forward direction with respect to the lens. The lamp and reflector assembly is supported in a housing on journals permitting selective angular positioning of the assembly about an axis disposed transversely to the longitudinal optical axis of the reflector to direct the light beam in a selected direction with respect to the housing. A modification includes two lamp and reflector assemblies incorporated into a unitary structure and mounted for relative rotation in a housing about a single axis.