| CPC B62D 55/0655 (2013.01) [B25J 5/005 (2013.01); B25J 11/005 (2013.01); B62D 55/075 (2013.01)] | 8 Claims |

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1. A self-driving assembly for passing through a narrow space elevated window, the assembly comprising:
a linear rail to govern a center of gravity for the assembly during the passing through the window;
a leading tread unit coupled to the rail to initiate the passing;
a lagging tread unit slidably coupled to the rail to facilitate movement thereof along the rail away from an end thereof and toward the leading tread unit; and
at least one securing extension of at least one of the units to engage one of the other unit and an edge defining the window to facilitate the passing of the assembly therethrough with cooperation of controlled mass transfer from the governed center of gravity by the rail.
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