GB195425A - Improvements in and relating to tar heating and spraying devices applicable to internal combustion motor road rollers - Google Patents

Abstract

195,425. Fowler & Co. (Leeds), Ltd., J., Wood, D., and Livsey, H. Nov. 28, 1921. Surface treatment with semi-liquid materials; cauldrons. - A road roller driven by an internal-combustion engine and provided with a tar boiler and tar - spraying nozzles has means for utilizing the exhaust gases from the engine (1) for heating the tar tank and the pump which delivers the tar to the spraying nozzles, the heat of the gases being, if necessary, supplemented in the case of the tar tank by a firebox in which a draught may be induced by the exhaust gases, and (2) for cleaning the spraying nozzles. An air compresser may also be used for the latter purpose and serves also to supply air during spraying to secure a better distribution of the tar. In the form shown, the vehicle is driven by a motor a. The exhaust pipe p of the motor passes, by way of a box p<4>, forming the base of a pump m which serves to deliver tar from a tank p<5> through a pipe r to the spraying nozzles s, to an arrangement of connected exhaust boxes p<1>, p<2>, p<3> in the bottom of the tar tank p<5>, and finally delivers into the air at z. A branch pipe p<6> leads from the outlet pipe z to a jet in the uptake w from a fire-box beneath the tank, the arrangement producing a forced draught through the fire-box when the outlet z is closed by a flap-valve. The, exhaust gases may be passed through a branch pipe p<7>, having a cock o, to the tar-delivery pipe r to clean this pipe and the nozzles s. Air may also be supplied to the nozzles, to clean them or to secure a better distribution of tar, by means of a compressor t driven by the motor a, the air passing through the pipe v to an equalizing cylinder u and thence to the nozzles through a pipe v<1>.