Agitating – Mortar mixer type – With heating or drying
Reexamination Certificate
2000-06-09
2001-08-28
Cooley, Charles E. (Department: 1723)
Agitating
Mortar mixer type
With heating or drying
C366S030000
Reexamination Certificate
active
06280073
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to asphalt producing. More specifically, it relates to the use of a rotary elevator to elevate dried aggregate to a mixing drum where it will be combined with liquid asphaltic concrete.
BACKGROUND OF THE INVENTION
During the asphalt making process, it is necessary to dry aggregate before mixing it with asphaltic concrete. This can be accomplished with a dryer drum that is separate from an asphalt mixing drum. Because gravity is used to move aggregate through the dryer drum, its aggregate discharge is typically at the bottom of the outlet end of the drum. Different methods of elevating the aggregate for introducing it to the inlet of the mixing drum have been used. These methods include a vertical bucket elevator, an inclined slat conveyor, and elevating the drying drum so that its discharge can feed to the inlet of the mixing drum.
SUMMARY OF THE INVENTION
The present invention comprises a rotary elevator attached to the mixing drum to lift the aggregate exiting the dryer drum to the inlet of the mixing drum. This would provide a simpler, more economical method of aggregate transfer than the methods currently used.
An additional object of the present invention is to provide an elevator that will provide additional area for the superheated virgin aggregate to combine with recycled asphalt materials. The additional space will provide premixing that will improve the heat transfer process during mixing.
Another object of the present invention is to provide a portable asphalt plant that has less equipment to move than existing plants with a separate mixer, resulting in reduced set up time. Further, the present invention has no moving parts, and is virtually maintenance free.
These and other features of the present invention are discussed or apparent in the following detailed description.
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patent: 4954995 (1990-09-01), Marconnet
patent: 5294197 (1994-03-01), Prill et al.
patent: 5397177 (1995-03-01), Swisher, Jr.
patent: 5556197 (1996-09-01), Loesch
patent: 278593 (1914-10-01), None
Cooley Charles E.
Dillman Equipment, Inc.
Wallenstein & Wagner Ltd.
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