Abstract: A portable asphalt storage silo includes a wheeled frame carrying a bin and a conveyor. During travel the bin is disposed in a lower position and the conveyor in a horizontal position overlying the bin. Two pairs of struts, a roller serving as a fulcrum, and two winch and cable systems conjointly elevate first the discharge end of the conveyor to an intermediate raised position and then the latter end and the bin to a final elevated position such that material can be carried up from ground level and discharged into the bin for storage.

Abstract: A cone crusher features a "fine" head and a pair of adapters and associated mantles which allow conversion of the crusher from fine to coarse operation, or vice versa, without the need to change the head itself. Each adapter and its associated mantle can be put on or taken off the head as a unit.

Abstract: A drum aggregate drier and a drum mixer for making asphaltic concrete feature heat shields between circumferentially adjacent flights inside the drum along the radiant zone of the burner flame in order to minimize drum overheating, heat loss and drum wall wear.

Abstract: A drum mixer for recycling old asphalt pavement features a stationary shroud enveloping a series of circumferentially spaced feed ports medially of the drum. The old pavement is introduced tangentially into the shroud and then into a series of "hoppers" within the shroud formed about the feed ports and revolving with the drum. The old pavement falls through the feed ports onto the exterior of a conical inner drum and is directed to the downstream end of the latter by flighting thereon where it joins virgin aggregate emerging from the interior of the inner drum.

Abstract: A method of hot mix recycling of old asphaltic concrete paving heats the old pavement, after it has been removed and sized, to a temperature below its firing point and heats fresh aggregate to a greater temperature before combining the two and adding new asphalt. The method is embodied in a drum-mixer type of apparatus modified by inserting a smaller drum in the upstream portion of the large drum. The burner fires into the smaller drum into which the fresh aggregate only is introduced while the old mix (plus additional fresh aggregate in certain cases) is introduced into the annular space between the two drums, the fresh aggregate and the old mix being thereafter combined in the large drum, new asphalt added and the mix further heated.

Abstract: A method of hot mix recycling of old asphaltic concrete paving heats the old pavement, after it has been removed and sized, to a temperature below its firing point and heats fresh aggregate to a greater temperature before combining the two and adding new asphalt. The method is embodied in a drum-mixer type of apparatus modified by inserting a smaller drum in the upstream portion of the large drum. The burner fires into the smaller drum into which the fresh aggregate only is introduced while the old mix (plus additional fresh aggregate in certain cases) is introduced into the annular space between the two drums, the fresh aggregate and the old mix being thereafter combined in the large drum, new asphalt added and the mix further heated.

Abstract: An hydraulic system controlling the steering and width of an articulated expandable tandem roller turns both rolls at the same time in opposite directions when the machine is being steered or in the same direction when being expanded or contracted. An operator controlled electrical system, also governing travel of the machine in either opposite direction, controls steering and width adjustment and automatically reverses the "hand" of the steering when the direction of travel of the machine is reversed.

Abstract: A steerable split roll for a road roller includes a pair of roll shells containing means by which vibratory force is applied to each. Between adjacent ends of the roll shells a "turntable" type of bearing both connects the roll shells together for rotation relative to each other and maintains them in axial alignment.

Abstract: A composite frame for a cone crusher and the like is fabricated from a number of separate frame members which are cut or rolled from plate material and secured by welds. A particular feature of the frame is the manner of connecting the crusher main shaft housing to the outer bowl supporting structure.

Abstract: A roll crusher incorporates gas hydraulic springs to maintain the desired spacing between the crushing rolls and to provide overload protection. Featured are separate hydraulic means for backing off and then reapplying the hydraulic springs by altering their overall lengths so that roll spacing can be readily adjusted.