The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 1993
Filed:
Sep. 25, 1992
J Donald Brock, Chattanooga, TN (US);
Astec Industries, Inc., Chattanooga, TN (US);
Abstract
A drum mixer which is useful in the continuous production of asphalt paving composition. The mixer includes a hollow drum which is mounted for rotation about an inclined axis, and the aggregate is introduced into the upper end of the drum so that as the drum rotates, the aggregate cascades through the interior of the drum and moves toward a discharge outlet at the lower end of the drum. A burner is mounted adjacent one end of the drum so that a heated gas passes through cascading aggregate. To permit the temperature of the exhaust gas to be maintained within acceptable limits so as to avoid detrimental effects to a downstream filtering baghouse, a gas flow bypass system is mounted in the downstream end portion of the drum. The bypass system may be selectively opened and closed, so that a portion of the heated gas may be selectively permitted to pass through a portion of the length of the drum and to the exhaust duct without passing through the cascading aggregate, which causes the temperature of the exhaust gas to rise. Upon the bypass tube system being closed, all of the heated gas flows through the cascading aggregate and the temperature of the exhaust gas is thus lowered.