(19)
(11) EP 0 271 456 A3

(12) EUROPEAN PATENT APPLICATION

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

(43) Date of publication A2:
15.06.1988 Bulletin 1988/24

(21) Application number: 87830429.4

(22) Date of filing: 03.12.1987
(51) International Patent Classification (IPC)4: F04B 9/04, F16H 21/20, F04B 49/00
(84) Designated Contracting States:
FR GB NL

(30) Priority: 10.12.1986 IT 4872686

(71) Applicant: SIAPA Società Italo-Americana Prodotti Antiparassitari S.p.A.
I-00198 Roma RM (IT)

(72) Inventor:
  • Di Vincenzo, Vincenzo
    I-00136 Roma RM (IT)

(74) Representative: Bazzichelli, Alfredo et al
c/o Società Italiana Brevetti S.p.A. Piazza di Pietra, 39
00186 Roma
00186 Roma (IT)


(56) References cited: : 
   
       


    (54) Delivery controlling device for variable delivery piston pumps


    (57) A device for adjusting the delivery of a pump for metering liquid products, particularly in agriculture, to be applied in precisely delivered dosed amounts, comprises an excentric bearing driving shaft (3), on which a cam (16) is mounted in an excentrically offset manner, the excentricity of which can be controlled by means of a gear driven by an operator through a control wheel (7), so that the parts with an excentric motion are reduced in number and a precise metering is ensured in view of a full turn of the wheel (7) varying the pump delivery from a minimum to a maximum.







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