Sweeping machine having improved surface seal

A vehicular sweeping machine comprising:

• (a) a frame;
• (b) means for driving the vehicular sweeping machine in a forward sweeping direction along a roadway having a roadway surface;
• (c) a broom assembly that is mounted to the frame, said broom assembly having a front side, a rear end and a center, and further comprising:
• (i) a broom enclosure having a front end and a rear end and further comprising:
• (A) a left end gate;
• (B) a right end gate;
• (C) a moldboard assembly comprising an outer moldboard and an inner moldboard, said outer moldboard and inner moldboard being arranged to form a labyrinth seal at the rear end of the broom enclosure;
• (ii) a broom that is mounted within the broom enclosure, said broom comprising a generally cylindrical tube with attached bristles having a bristle length, said broom being adapted to rotate about a generally horizontal axis;
• (iii) a plurality of links that are pivotally mounted between the frame and the broom assembly, said plurality of links being adapted to permit the broom assembly to move upwardly and downwardly with respect to the frame;
• (iv) means for raising and lowering the broom assembly with respect to the frame;
• (d) a broom conveyor having a lower end that is disposed within the broom enclosure.