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:
Oct. 22, 1985
Filed:
Jul. 28, 1983
Paul F Haake, Highland Park, IL (US);
Price R Hodson, Elmhurst, IL (US);
Alnor Instrument Company, Skokie, IL (US);
Abstract
An improved selector provides for air paths between a meter and an air volume sensing manifold that are similar for both up and down flow of air through the apparatus thereof. This provides similar momentum losses in the air reaching the meter for both air up and down flow through the apparatus to obtain more accurate meter readings of the air flow volume. Separate throttling screws are provided for the throttling orifices, providing different range selections, and are independently adjusted to compensate for minor air passage differences in the selector, and air flow pattern differences in up and down flow. A calibrated area reducer in the form of a sheet of perforated stock is positioned upstream in the throat in contact with the manifold to extend the measuring range of the apparatus while minimally disturbing the air flow patterns through the apparatus.