In-line window structure for transport vehicle

An in-line window structure for a transport vehicle, said window structure comprising a rectangular frame, a fixed pane having a sash frame immovably secured in said rectangular frame, a displaceable pane also having a sash frame securable to a side of said fixed pane in a common plane therewith, said fixed and displaceable panes being thermo-panes having two spaced-apart glass sheets, an outer one of said glass sheets being closely spaced to an outer peripheral edge of said frame when said panes are disposed in-line in said common plane to provide a flush outer surface with said frame, said displaceable pane having a handle secured to a vertical sash member intended to be positioned adjacent a vertical sash member of said fixed pane, lock means for interconnecting said adjacent vertical sash members when positioned adjacent one another in said common plane, said sash frame of said displaceable pane having a top and bottom horizontal sash member, said top and bottom horizontal sash members having follower elements extending into oppositely aligned guide tracks provided in a top and bottom frame member of said rectangular frame, said guide tracks having an elongated straight track section thereof extending behind said fixed pane and parallel thereto and a commuting track section for guided displacement of said displaceable pane from said common plane to said straight track section and behind said fixed pane and substantially in alignment therewith whereby to create an opening in said rectangular frame to one side of said fixed pane, said commuting track section being comprised by a first straight track section and a second angulated straight track section, said first straight track section being disposed in transverse alignment between said elongated straight track section and said follower elements which are adjacent said vertical sash member, the sash member having said handle connected thereto, and said second angulated straight track section extending from a free end of said elongated straight track section behind said displaceable pane and terminating into a straight channel end section, one of the follower elements extending into a vertical retention channel of said rectangular frame disposed in a common plane with said sash frame of said fixed pane, said outer one of said glass sheets of said displaceable pane having a vertical projecting section extending beyond an inner one of said glass sheets and a vertical rear sash member of said displaceable pane to permit said displaceable pane to be retracted inwardly into said rectangular frame on one of the follower elements.