(19)
(11) EP 0 290 200 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.06.1989 Bulletin 1989/25

(43) Date of publication A2:
09.11.1988 Bulletin 1988/45

(21) Application number: 88303843.2

(22) Date of filing: 28.04.1988
(51) International Patent Classification (IPC)4: F01P 11/12
(84) Designated Contracting States:
BE DE FR IT

(30) Priority: 29.04.1987 US 43915

(71) Applicant: DEERE & COMPANY
Moline Illinois 61265-8098 (US)

(72) Inventors:
  • Nelson, James Roger
    Geneseo Illinois 61254 (US)
  • Love, Mahlon L.
    Geneseo Illinois 61254 (US)

(74) Representative: Pears, David Ashley (GB) 
Broadlands 105 Hall Lane
GB-Upminster, Essex RM14 1AQ
GB-Upminster, Essex RM14 1AQ (GB)


(56) References cited: : 
   
       


    (54) Self-cleaning rotary screen for filtering air


    (57) A self cleaning rotary screen of a combine harvester is provided with a planar circular screen (54) that is secured to an outwardly extending circular flange having an external groove and an internal groove. The screen is rotatably mounted on a hinged door (30) by a plurality of freely rotatable wheels (44-48) which are spaced around an aperture (40) in a door plate (38) and engage in the internal groove of the flange. Also secured to the door are two freely rotatable idler sheaves (66, 68) located adjacent to the hinge axis (P) of the door so that the endless drive belt which runs in the external groove passes from the two idler sheaves to a positionally fixed drive sheave (70) in tangential directions approximately aligned with the hinge axis (P). The drive sheave is driven by the propulsion system of the harvester and its rotational axis intersects the hinge axis (P). The door (30) can thus be opened without uncoupling the belt (64).







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