Patent EP0553598B1 successfully refreshed from Google Patents.
EP0553598B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A fan with convex blades
Assignee: SPAL Automotive SRL
•
Filing: 1992-01-30
•
Granted: 1996-03-27
•
Expires: 2012-01-30
Abstract
No abstract record available.
Inventors
- 👤 Alessandro Spaggiari
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 01:53
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/325; F04D29/38
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
66 words
An axial fan with the blades curved in the opposite direction to the rotation direction of the fan, constituted by a hub (3) from which blades (2) radiate out wards to an external stiffening ring (4), the said blades (2) having a section which is an airfoil profile characterised in that the chord (L) of each blade is constant along the radial direction of the fan.
Claim 2
Dependent Claim
46 words
An axial fan according to claim 1, wherein the projections, on a plane perpendicular to the axis of rotation of the fan, of the blade (2) anterior or entry edges (5) and the blade (2) posterior or exit edge (6) are defined by two circumference arcs.
Claim 3
Dependent Claim
68 words
An axial fan according to claim 1, wherein the said blades (2) exhibit a twist, or more precisely a progressive variation in the angle of attack of the airfoil section of the blade, i.e. the angle made by the direction of air approach and the chord, in function of the radius of the fan, which twist is constant along its entire longitudinal development towards the external ring (4).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.