RAILWAY LIGHT SIGNAL

摘要

A light signal provides fixed focus and aspect to aspect alignment. This signal comprises a housing having a rear entry for maintenance thereof and such that a lens mount containing a lens unit can be removably secured to a selected inside surface of the front wall of the housing to align the lens unit with an aperture in the front wall and wherein a means for securing each lens mount to an inside surface of the front wall is provided such that the lens unit is secured in the lens mount in aspect alignment and each lens unit is in aspect to aspect alignment with any other lens units contained within the housing. Each lens mount includes a fixed focusing means having a receptacle for operative receipt of a light means, wherein the fixed focusing means is positioned at the end of the lens mount nearest an inner lens; whereby the light means aligns with the lens unit and the aperture such that the focus of the light means is fixed relative to the lens unit and the aperture.