of the sweeper 15 under normal conditions the high entrainment velocity of the pressurized air exiting the blast orifice 60 is sufficient to clean the surface s of debris but in some cases debris is stuck to the surface s and will not break loose under air pressure and must be agitated or brushed therefrom accordingly in further accordance with this invention the pick up head 10 is provided with a broom chamber 70 defined between the top wall 25 the side walls 43 44 fig5 the skirt 61 fig3 and 4 and a rear wall 69 broom means 71 in the form of a broom is housed within the broom chamber 70 and is defined by a plurality of bristles 72 projecting radially outwardly from and continuously along the length of a hollow tubular shaft 73 having opposite first and second end portions 74 75 respectively fig5 the shaft end portions 74 75 each internally receive a respective fitting 76 77 fig1 which is welded to the shaft 73 the fittings 76 77 include respective polygonal substantially square openings 78 79 the openings 78 79 are connected to and in part defined journals for effecting rotation of the broom 71 clockwise as viewed in fig3 and 4 in a manner to be described more fully hereinafter the shaft 73 is not only mounted for rotation at each of its opposite end portions 74 75 but is also mounted for axial assembly and disassembly relative to respective arms 84 85 which are in turn part of respective independent broom pivotal mounting mechanisms 94 95 respectively fig7 the arm 85.