Railway light signal
AssigneeGeneral Railway Signal Corporation
InventorsDavid A. Donatello, Kenton H. Barker, Ronald W. Dinger, James M. Martin
Life of this patent
Estimating the term…
Abstract
A light signal provides fixed focus and the ability to service the device solely from the rear. This light signal comprises a housing having a rear entry for desired maintenance and an immovable front wall, the lens mount containing a lens unit that is removable secured to an inside surface of the immovable front wall of 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 focus of the light means is fixed relative to the lens unit.
Claims6
A rear access, railway light signal which comprises:
- a housing including an immovable front wall having at least one aperture and an inside and outside surface, and having a rear wall with a rear door, said rear door being movable from a first, closed position that prohibits access to the interior of said housing to a second, open position that permits access to the interior of said housing;
- a complete lens unit having an inner lens and an outer lens;
- means for removing said complete lens unit rearwardly from a normal, operable position in the interior of said housing to a second, non-operable position but only when said rear door is in said second, open position;
- said means for removing including at least one funnel-shaped lens mount for receiving said inner lens and outer lens unit, said lens mount having an integral ring-shaped flange at its outer front periphery for normally abutting the inside surface of said immovable front wall and surrounding said at least one aperture;
- and means for removably securing said lens mount at said inside surface of said immovable front wall, whereby the complete lens unit is fully serviceable and replaceable without affecting the front of said light signal;
- and
- at least one light mean secured to the rear of said lens mount.
Dependencies are inferred from the claim text.