Patents Assigned to Ventilatoren Sirocco Howden B.V.
  • Rotor blade with a reduced tip
    Patent number: 6761539
    Abstract: A rotor blade for a fan, said rotor blade comprising a first blade zone having an airfoil cross-section and a second blade zone having a cross-section of reduced thickness, wherein the average thickness of the second blade zone is less than 50% of the average thickness of the first blade zone.
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: July 13, 2004
    Assignee: Ventilatoren Sirocco Howden B.V.
    Inventors: Giorgio Roberto Cipelletti, Hendrik Fedde van der Spek
  • Rotor blade with a reduced tip
    Publication number: 20040018090
    Abstract: A rotor blade for a fan, said rotor blade comprising a first blade zone having an airfoil cross-section and a second blade zone having a cross-section of reduced thickness, wherein the average thickness of the second blade zone is less than 50% of the average thickness of the first blade zone.
    Type: Application
    Filed: July 24, 2002
    Publication date: January 29, 2004
    Applicant: Ventilatoren Sirocco Howden B.V.
    Inventor: Giorgio Roberto Cipelletti
  • Housing part for a ventilating fan
    Patent number: 6499947
    Abstract: Disclosed is a housing part for a ventilating fan with an axial rotation shaft. A number of housing parts can be placed radially around the ventilating fan so as to form a substantially cylindrical housing. The housing part includes an inner wall; an outer wall placed at a distance from the inner wall; and connecting walls extending between the inner wall and the outer wall. The inner wall, outer wall and the connecting walls define a closed space.
    Type: Grant
    Filed: January 4, 2001
    Date of Patent: December 31, 2002
    Assignee: Ventilatoren Sirocco Howden B.V.
    Inventor: Henricus Johannes Bernhardus Olthof
  • Method of fan blade manufacture
    Patent number: 5683636
    Abstract: A blade for a fan is formed by rotomolding around a pre-positioned support member, part of which extends out of the mold, the support member being shaped, or being provided with one or more projections, which are partly embedded in the plastic material forming a skin of the fan blade. The fan blade is made hollow by this method, but is preferably filled either during molding or subsequently with a hard foam material. A hub is also provided for mounting any fan blades, but in particular those made by the method, in which a hub includes a body portion having a first radial face associated therewith, a plate having a second radial face parallel to the first radial face and spaced therefrom, and a plurality of circumferentially equally spaced depressions facing one another on the first and second radial faces to accommodate the fan blade support members, means being provided to secure the plate to the body portion effective to clamp the fan blade and support members firmly.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: November 4, 1997
    Assignee: Ventilatoren Sirocco Howden B.V.
    Inventors: Hendrik Fedde van der Spek, Henricus Johannes Bernardus Olthof