Road surface layer reproducing apparatus

Claim 1

A road surface layer reproducing apparatus in the form of an automotive vehicle, comprising an automotive main frame-like body, a mixture hopper at a front side of said main body, and a scarifier and a mixers at positions beneath said main body, said mixture hopper being supported by a hopper supporting shaft laid on said main body in the longitudinal direction thereof while the hopper supporting shaft is kept horizontal, and said mixture hopper being laterally swingable in a plane perpendicular to said longitudinal direction about said hopper supporting shaft, said scarifier having claws mounted thereon via fittings, and being disposed in a vertical posture in a state wherein each fitting has a pin idly inserted into a pin hole formed in an upper end portion of the corresponding claw, and wherein means are provided for vertically moving said fittings so that lower ends of said claws may follow up the contour of a road to be reproduced, said mixers including a first and a second mixer which are disposed in such a manner as to intersect the advancing direction of said main body at right angles thereto, said first mixture being constructed in the form of a single-shaft rotor and being arranged such that its depth of penetration into a previous pavement of said road is adjusted to a predetermined value by a depth measuring device for sensing a surface of said pavement and thereby controlling said depth of penetration, said first mixer moving a mixture toward a position corresponding to a central part of said main body by means of rotor bits mounted to an outer peripheral surface of said rotor, to thereby form a windrow of said mixture over which is dropped a bituminous mixture having been transferred rearwardly of said main body from said hopper by way of a bar feeder, said second mixer being located at a position succeeding to said first mixer and being constructed in the form of a parallel mounted twin-rotor system and made vertically movable by a three-point supporting mechanism, said second mixer being adapted to mix together said windrow and said bituminous mixture as dropped thereover.