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:
May. 26, 1987
Filed:
Dec. 09, 1985
Rolf A Oscarsson, Hudson, OH (US);
Rao Medical Devices, Inc., Hudson, OH (US);
Abstract
A device for metering the flow of a liquid medium passing therethrough comprises a plastic stem member having a cylindrical metering drum element projecting into and rotatively engaged in liquid tight relation with the cylindrical wall of a bore chamber in a body member to rotatively mount the stem member therein. A diametrically slotted headed stud projecting endwise from the drum element is contracted and inserted through a bore opening in the end wall of the chamber in the body member to cause the head end of the stud to snap-lock behind the chamber end wall and thus secure the stem and body members together in assembled rotative relation. Diametrically opposite arcuate metering slots of decreasing cross-sectional size in the cylindrical surface of the drum element and leading from opposite ends of a diametrical cross passageway in the drum, meter the flow rate of the liquid medium into and out of the chamber through diametrically opposite port openings in the chamber side wall, depending on the relative rotative position of the stem and body members. Generally radially outward extending actuating arm means on the stem and body members enable relative rotative movement thereof to a selected metering position.