Patent ID: 6565281
Filing Date: 2003-05-20
Classification: B05B,E01C

Abstract:
A device for working road surfaces comprising:an automotive running gear (2) with a working roll (4) enclosed by a cover (8) forming a working chamber (6); a drive motor for driving the working roll (4); means (10) for producing foamed bitumen through a plurality of adjacent mixing means (12) located in the cover (8); a bitumen reservoir for supplying hot bitumen to said mixing means (12) via a conduit means (42); said mixing means (12) including means (26) for defining an expansion chamber exterior of said conduit means (42); aperture means (18) for placing said conduit means (42) in fluid communication with said expansion chamber defining means (26); foam outlet nozzle means (14) for discharging the foamed bitumen from said expansion chamber defining means (26); means (22 or 29) for introducing a second fluid into said expansion chamber defining means (26) for admixture with the hot bitumen to thereby form the foamed bitumen incident to the discharge thereof through said foam outlet nozzle means (14); means (30) for plunging through said aperture means (18) for the cleaning, opening and closing of said aperture means (18), said plunging means (30) being located exteriorly of and substantially coaxially aligned with said aperture means (18), said plunging means (30) and said aperture means (18) being of substantially identical symmetrical cross-sections so that respective exterior and interior complementary surfaces slide axially relative to each other when said plunging means (30) is moved through said aperture means (18) into and out of said expansion chamber defining means (26); means (32) exteriorly of said conduit means (42) for selectively controlling the movement of said plunging means (30) through said aperture means (18) and into and out of said expansion chamber defining means (26); said plunging means (30) and aperture means (18) include an associated common axis of movement and flow respectively; a water reservoir for supplying water to said mixing means (12) via said one second fluid injection means (22) for mixing with the hot bitumen under pressure in said expansion chamber defining means (26); heating means (H) for heating the mixing means (12); and said foam outlet nozzle means (14) being directed into the working chamber (6) for spraying a jet of the foamed bitumen into and for becoming mixed with a construction material mixture granulated by the working roll (4).