Interlock system for a trailer and bogie

Claim 1

In combination with a tractor driven trailer having a pair of tracks with spaced apertures secured thereto, a structure having a plurality of wheels for supporting said trailer and having a pair of rail elements for slidable mounting to the tracks of said trailer, said structure including parking brake means to inhibit rotation of the wheels on said structure and parking brake chambers for receiving air pressure from a source of air pressure to selectively overcome the braking of said parking brake means; a locking mechanism comprising: (a) guide means having an opening therein secured to said structure for receiving a pin element; (b) a pin element secured to said structure and disposed to move within the opening of said guide means; (c) means for moving said pin within the opening of said guide means from at least one of said rails into a selected one of said plurality of apertures in one of said tracks to secure said structure to said trailer; (d) means for connecting air pressure from said source into the opening within said guide means; (e) means for connecting said opening within said guide means to said brake chambers; (f) means associated with said pin element including a pair of spaced flexible ring elements extending around said pin and dimensioned to compress when inserted into the opening in said guide means to provide a sealed chamber between said ring elements with said guide means within said opening; (g) said sealed chamber being alignable with said means for connecting air pressure and means for connecting said opening when said pin is inserted from one of said rails through said selected one aperture of one of said tracks to permit air pressure to pass from said source through said sealed chamber into said brake chambers, with no air pressure being applied from said source to said brake chambers when said pin is not inserted from said one rail through said selected one aperture in said one of said tracks and said sealed chamber is misaligned with respect to the means for connecting said air pressure and said means for connecting said opening.