主权项 |
1. An apparatus comprising:
a main body having a first recess, the first recess of the main body having an interior length, an interior width and an interior depth, the interior length being at least 20 times the interior depth; an electrical source in the first recess of the main body, the electrical source having an exterior length, an exterior width and an exterior depth, the exterior length is at least 20 times the exterior depth; the exterior depth of the electrical source being about the same as the interior depth of the first recess of the main body; the main body further comprising a second recess that is concentric to the first recess, the second recess located on the exterior of the main body, the first recess located inward from the second recess and the exterior of the main body, the second recess having an interior length, an interior width and an interior depth; a top cover in the second recess, the top cover having an exterior length, an exterior width and an exterior depth, the exterior length of the top cover being about the same as the interior depth of the second recess and the exterior width of the top cover being about the same as the interior width of the second recess; a frame rotably attached to the main body, the frame having a U geometry; a battery electrically coupled to the electrical source; and a drive motor electrically coupled to the battery.
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