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In a roadway surface reconditioning apparatus, for example, a scarifier for use with an asphalt or like bituminous roadway surface, a number of heaters of the luminous wall type are employed to direct large quantities of radiant heat downwardly towards the surface for softening it while travelling a

In a roadway surface reconditioning apparatus, for example, a scarifier for use with an asphalt or like bituminous roadway surface, a number of heaters of the luminous wall type are employed to direct large quantities of radiant heat downwardly towards the surface for softening it while travelling along the roadway. These heaters consist basically of porous fire bricks through which an air/propane mixture passes and on the surface of which it burns. Each heater also has porous side walls that project closer to the roadway surface than the main bricks and are supplied with air for forming a downward curtain of air to inhibit sideways escape of heat from the region beneath the heater. The heaters are assembled in banks that are spaced apart from each other in the direction of travel. This spacing can be adjusted. Each pair of adjacent banks is bridged by heat deflectors that help to provide heat soak areas between the heater banks. The apparatus also includes a novel scarifying assembly with increased adjustability of the scarifying depth of the teeth.

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In a roadway surface reconditioning apparatus, a heater assembly for mounting in a location closely above an asphalt or like bituminous roadway surface for directing large quantities of radiant heat downwardly towards such surface for softening the same for subsequent scarifying, and mobile support

In a roadway surface reconditioning apparatus, a heater assembly for mounting in a location closely above an asphalt or like bituminous roadway surface for directing large quantities of radiant heat downwardly towards such surface for softening the same for subsequent scarifying, and mobile support means for causing said heater assembly to travel along the roadway in such location; wherein the heater assembly comprises (a) a plurality of luminous wall heaters each mounted in a steel frame, each supplied with air/gas mixture and each consisting of a plurality of porous fire bricks through which such mixture passes and on the downwardly facing surfaces of which such mixture burns to direct radiant heat to the roadway surface, each heater further having porous side walls projecting closer to the roadway surface than said bricks and supplied with air for forming a downward curtain of air to inhibit sideways escape of heat from the region beneath the heater and to cool and protect the steel frame, (b) said heaters being assembled into at least two banks of heaters, each bank extending in the transverse direction across the apparatus, and the banks being spaced apart from each other in the direction of travel along the roadway to provide a heat soak area between these two banks, (c) heat deflectors extending for the full length of the heater banks in said transverse direction and bridging the two heater banks in the travel direction whereby to return heat to those parts of the roadway surface that are momentarily located between the heater banks as the apparatus travels along the roadway and to protect portions of the apparatus above the heaters and the surrounding environment from the heat, and (d) means mounting said heater banks on said mobile support means to be adjustable in the travel direction and for changing the size of the heat deflectors in the travel direction for varying the spacing between the banks of heaters and hence the length of such soak area in the travel direction for accommodating the apparatus to variations in the nature and dimensions of the roadway surface, the depth of scarification required and ambient temperature, (e) said heat deflectors bridging all the heater banks in the travel direction whereby uninterruptedly from one end of the heater assembly to the other heat is directed downwardly towards the roadway surface and portions of the apparatus above the heaters are protected.