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. 26, 1999
Filed:
Dec. 30, 1997
Calin Ion Ciobanu, Brea, CA (US);
Donald Schaeffer, Riverside, CA (US);
Bear Medical Systems, Inc., Waltham, MA (US);
Abstract
A variable orifice flow sensor includes a flow conduit member defining a flow orifice and fluidly connecting first and second fluid flow ports, a flapper of magnetizable sheet metal that is mounted in the conduit member by a hinge portion so that the flapper angularly deflects out of the plane of the orifice in response to fluid flow through the conduit member to vary the effective fluid flow cross-sectional area of the orifice in proportion to the flow rate of fluid through the conduit member, and a pressure sensing tap on either side of the flapper. A deflection-limiting surface is provided in the conduit member adjacent the hinge portion. The hinge portion abuts against the deflection-limiting surface when the flapper experiences an angular deflection at least equal to a predefined angle in response to a fluid flow rate that is at least equal to a predetermined value, whereby overstressing of the hinge portion is minimized. In addition, at least one magnet is provided in the conduit member adjacent the flapper, whereby the magnet generates a magnetic field that acts on the flapper so as to force it into a position that tends to minimize the zero flow gap that exists between the flapper and the portion of the conduit member that defines the fluid flow orifice when there is no fluid flow through the orifice.