(19)
(11) EP 0 333 667 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.12.1989 Bulletin 1989/50

(43) Date of publication A2:
20.09.1989 Bulletin 1989/38

(21) Application number: 89830054.6

(22) Date of filing: 14.02.1989
(51) International Patent Classification (IPC)4: F04B 39/10, F04B 39/06
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 17.02.1988 IT 6712288

(71) Applicant: CHINOOK S.p.A.
I-10090 Bruino (Torino) (IT)

(72) Inventors:
  • Prevosto, Gianfranco (IT)
    I-10142 Torino (IT)
  • Stantero, Giovanni (IT)
    I-10137 Torino (IT)

(74) Representative: Bosotti, Luciano et al
c/o JACOBACCI & PERANI S.p.A. Corso Regio Parco, 27
10152 Torino
10152 Torino (IT)


(56) References cited: : 
   
       


    (54) Improvements in air compressors


    (57) The improvements concern essentially:
    - the presence of a valve-plate (9) through which ventilation channels (16) pass,
    - the use of a cooling fan (17) which is driven by the shaft (5) of the compressor and can induce a forced flow of air through the channels (1 6),
    - the provision of a lubricating-oil filler duct (36) separate from the oil-vapour discharge duct (32 to 35) which passes through one of the bearings (32) of the shaft,
    - the use of a generally tank-shaped lower portion of the casing (25),
    - the use of pistons (3) with sealing rings (48) mounted on a head portion (42) which can easily be separated from the rest of the piston (40) so that the rings (48) can be replaced without the need completely to dismantle the piston (3) and the members (4, 5) associated therewith, and
    - the provision of annular cavities (39) in the walls of the cylinders (3) which act as sumps for the collection and recovery of the lubricating oil.







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